JP2018065176A - Cast product, cast product manufacturing data management method, marking material for main mold of mold molding and method of casting-out in sand mold casting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a casting technique capable of assigning a management code without affecting the tact time of casting. In the present invention, a management code formed of a combination of a plurality of convex character strings and a special symbol composed of a plurality of convex dots and capable of changing the dot pattern is stored in a main type. It was decided to stick to the cavity surface. [Selection] Figure 5

Description

  The present invention relates to a casting technique using a management code.

  Conventionally, in the technique described in Patent Document 1, heat is applied to an aggregate containing a thermosetting resin to process it, and then it is cured to form a sand-type member. A technique (hereinafter referred to as an engraving process) for engraving a concave management code by bringing a vibrating terminal into contact with a region where the molten metal of the sand mold member flows is disclosed.

JP2015-139791A

  In recent years, there is a demand for finely managing mass-produced products, and the number of characters tends to increase in proportion to an increase in the amount of information. However, in the method of Patent Document 1, it is necessary to engrave all the management codes on the cavity surface of the sand mold, and there is a problem that the engraving process takes a long time. In particular, when a large number of products are obtained with a single sand mold, it is necessary to engrave a management code for each product. If it does so, the time of the engraving process will become long, and there existed a problem of causing the fall of casting efficiency by not being in time for the time (henceforth a casting tact time) until pouring molten metal into the next sand mold.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a casting technique capable of assigning a management code without affecting the tact time of casting.

  In order to achieve the above object, in the present invention, a management code formed by a combination of a plurality of convex character strings and a special symbol composed of a plurality of convex dots and capable of changing the dot pattern, It was decided to stick to the cavity surface of the main mold.

  Therefore, the management code can be changed in a short time.

1 is a schematic diagram illustrating a casting process of a ductile casting of Example 1. FIG. 3 is a schematic diagram illustrating a sand mold manufacturing process of Example 1. FIG. 3 is a schematic diagram illustrating a sand mold manufacturing process of Example 1. FIG. 3 is a schematic diagram illustrating a sand mold manufacturing process of Example 1. FIG. It is a figure showing the marking material of the character string for casting of Example 1. FIG. 2 is a partial cross-sectional view of convex alphabets and numbers in the first marking material of Example 1. FIG. 6 is a partial cross-sectional view of a convex dot symbol in a second marking material of Example 1. FIG. It is a block diagram in the case of performing the change of the number of dot symbols by the cutting | disconnection of Example 1 with a robot. It is an enlarged view showing the cutting process of the 2nd marking material of Example 1. FIG. FIG. 3 is a schematic diagram illustrating the arrangement of dot symbols and a counting method according to the first embodiment. It is a characteristic view showing the visibility of the dot symbol after ductile casting casting of Example 1. It is a characteristic view showing the visibility between the dot symbols after ductile casting casting of Example 1. 3 is a flowchart illustrating a manufacturing data management method according to the first embodiment. 3 is a flowchart illustrating a manufacturing data management method according to the first embodiment. 3 is a flowchart illustrating sand processing according to the first embodiment. 3 is a flowchart illustrating a molten metal process according to the first embodiment. 3 is a process chart showing the manufacturing process of Example 1. It is a casting condition data sample of Example 1. 3 is a flowchart illustrating a quality factor effect analysis process according to the first embodiment. In the quality factor effect analysis process of Example 1, it is a flowchart showing the analysis process when the product in which the problem generate | occur | produced the strength came out. It is a fragmentary sectional view (between BB 'of Drawing 1) of a convex dot symbol in the 2nd marking material of Example 2. It is a figure showing the marking material of the character string for casting of Example 3. FIG. It is a fragmentary sectional view (between BB 'of Drawing 22) of a convex dot symbol in the 2nd marking material of Example 3. It is a modification of the fragmentary sectional view of the convex dot symbol in the 2nd marking material. It is a modification of the fragmentary sectional view of the convex dot symbol in the 2nd marking material. It is an enlarged view showing the heat melting instrument of the 2nd marking material of Example 3. FIG. 6 is a schematic diagram illustrating a heat melting step of a second marking material of Example 3. FIG. It is the schematic showing the arrangement | positioning and the counting method of the dot symbol of another Example. It is the schematic showing the arrangement | positioning and the counting method of the dot symbol of another Example. It is the schematic showing the arrangement | positioning and the counting method of the dot symbol of another Example. It is the schematic showing the arrangement | positioning of the dot symbol of another Example. It is a figure showing the marking material of the character string for casting of another Example. It is the schematic showing the marking material installation position of the character string for casting of another Example. It is an example of the product provided with the marking material area in another Example. It is an example which takes many products provided with the marking material area in another Example. It is a figure showing the marking material in another Example.

  [Example 1]

FIG. 1 is a schematic diagram illustrating a casting process of the ductile casting of the first embodiment. The upper stage of FIG. 1 is a molten metal manufacturing process, the interruption is a pouring process, and the lower stage represents a sand mold manufacturing process.
In the molten metal manufacturing process, a molten metal containing iron as a main component is manufactured in the melting furnace 30, and is divided into processing ladle 31a. Then, using the adjusting device 32, a spheroidizing agent such as Mg and an inoculant such as Mn or Cu are added to the processing ladle 31a to adjust the chemical composition, and after pouring into the ladle 31 for pouring, Move to a predetermined position on the production line to be poured.

  The lower part of FIG. 1 and FIGS. 2 to 4 are schematic views showing the sand mold manufacturing process of Example 1. In the sand mold manufacturing process, after installing the lower main mold 10d in the lower mold 100, the lower sand mold 102 is created by filling the sand. Similarly, after installing the upper main mold 10u and the gate mold in the upper mold 101, as shown in FIG. 2, a marking material to be described later is applied to the upper main mold 10u, and the gate 11 is filled with sand. The provided upper sand mold 103 is created. At this time, as shown in FIG. 3, information formed on the marking material is transferred to the upper sand mold 103 as an uneven shape. Then, as shown in FIG. 4, the sand mold 104 is manufactured by superposing the upper sand mold 103 on the lower sand mold 102. Hereinafter, the upper main mold 10u and the lower main mold 10d are collectively referred to as the main mold 10 as well.

  In the pouring process, the sand mold 104 is placed on the production line, and when pouring from the ladle 31 to the gate 11 is completed, the next sand mold 104 is transported and poured from the ladle 31. The time from the start of pouring water to a certain sand mold 104 to the start of pouring water to the next sand mold 104 is referred to as a tact time. After cooling, after the pouring process is finished, the sand mold 104 is broken to take out the ductile casting, and unnecessary parts such as the pouring gate 11 are removed to form a product.

  A management code is attached to the ductile casting of Example 1 by casting. Casting characters as management codes for ductile castings are created by registering each casting product with its manufacturing process information, inspection information, etc. in the database, and in the event of a failure in the manufacturing process. Can be easily clarified, and the response to defects can be speedy. The final product on the market also has a function for realizing traceability based on the management code cast into the cast product.

  FIG. 5 is a diagram illustrating a marking material for a character string for casting according to the first embodiment. The casting character string in Example 1 is a combination of alphabets and numbers based on daily lot management, etc., and a dot symbol that combines dots that are special symbols that can be subdivided into ladle units. Configured. Here, a dot is a projection-like part erected in a column shape from a flat part, and includes a cylinder, a prism, and the like. A character string (hereinafter referred to as a management code) composed of alphabets, numerals, and dot symbols is formed by a marking material for a resin plate. The marking material has a first marking material 1 for casting alphabets and numbers, and a second marking material 2 for casting dot symbols. Here, the character shown in the first marking material 1 represents a recognizable symbol that is generally shared regardless of a specific rule, and the symbol shown in the second marking material 2 can be recognized by a special rule. Symbol. This marking material is attached in advance to the cavity surface of the main mold for modeling the casting sand mold with an adhesive. Thereby, since the management code is stamped at the time of sand mold forming, the character peripheral portion can be formed without losing its shape, and as a result, the accuracy of casting the character string into the cast product can be improved.

  FIG. 6 is a partial cross-sectional view of convex alphabets and numerals in the first marking material of Example 1 (between AA ′ in FIG. 5) or a convex dot symbol part in the second marking material of Example 1. Sectional view (between BB 'in FIG. 5), FIG. 7 is a partial sectional view in which the cutting performance necessary for changing the dot pattern is improved by the convex dot symbol in the second marking material of Example 1 (FIG. 5). BB ′). As shown in FIG. 6, the character string portion of the first marking material 1 and the dot symbol portion of the second marking material 2 have a convex shape with a height h1 in the cross section. This convex shape has a tapered shape toward the tip, improving the moldability during sand mold shaping and the hot water pouring performance during casting.

  Moreover, as shown in FIG. 7, the dot symbol part of the 2nd marking material 2 is made into the convex shape of height h2 in a cross section. The height h2 is set to a height at which the difference between the height before cutting the dots and the height after cutting the dots is sufficiently visible after casting. The convex shape includes a straight portion 2a formed at the base and having a certain extending section having the same cross-sectional shape, and a tapered tip portion 2b formed on the tip side. Therefore, the moldability at the time of sand mold making and the oil circulation property at the time of casting are ensured. In addition, the tip of the tip 2b of Example 1 has a flat shape, and a stable dot shape is ensured by avoiding an excessively thin portion. The dot symbol of the second marking material 2 can easily change the display of the special symbol, for example, by cutting a predetermined portion of the dot symbol every time the molten metal is divided (distributed) into the ladle 31. Therefore, the management code can be changed for each ladle 31. Further, when changing the dot symbol, the straight portion 2a is cut. That is, since the cut portion of the straight portion 2a is perpendicular to the cutting direction, it is possible to avoid the escape of the blade when cutting with a blade or the like at the time of cutting, and the dot symbol display can be changed stably in a short time. it can.

  In particular, in the case of a large number of castings in which a plurality of casting products are cast with one casting mold, it is necessary to change the management code of all casting products in accordance with the manufacturing tact time. If the marking material 2 is re-applied every time the ladle 31 is changed, it takes time to re-apply a large number of marking materials 2 and cannot meet the tact time. It is difficult to improve. On the other hand, if only one dot of the dot symbol is cut, all management codes can be changed in a short time, even if many pieces are taken, and the tact time is not affected. This is very advantageous in terms of production efficiency.

  FIG. 8 is a configuration diagram when the robot changes the number of dot symbols by cutting in the first embodiment, and FIG. 9 is an enlarged view showing a cutting process of the second marking material in the first embodiment. A cutting hand 105 is attached to the tip of the robot RB. The cutting hand 105 according to the first embodiment is a scissor type or a cutter type and has a function of cutting dots. The operating state of the robot RB is controlled by the robot computer RC. The robot computer RC executes a cutting process on the dot symbol of the second marking material 2 to be cut based on a command from the production management computer MC. Thereby, the display of the management code is changed by cutting a part of the second marking material 2 attached to each cavity surface of the lower mold 100.

  FIG. 10 is a schematic diagram illustrating the arrangement of dot symbols and the counting method according to the first embodiment. As shown in FIG. 10, a part of the dots is cut and disappeared, and the number of disappearances (may be the remaining number) is counted or recognized by pattern recognition. Specifically, when all the dots remain, it is recognized as “0”, when one dot is lost, it is recognized as “1”, and when two dots are lost. Recognizes “2”.

  FIG. 11 is a characteristic diagram showing the visibility of the dot symbol after the ductile casting of Example 1 is cast. The horizontal axis represents the diameter W of the dot symbol of the second marking material 2 before casting, and the vertical axis represents the diameter W of the dot symbol after casting. In the casting process of Example 1, the 2nd marking material 2 which consists of resin plates is affixed on the lower mold | type 100, and a character shape is transcribe | transferred to a sand mold. Next, the molten metal is poured from a pouring ladle into a sand mold, cooled, the sand is removed, and blasting and finishing are performed. After these casting processes, it was examined whether visibility could be secured. According to this, unlike the alphabet and numbers, the dot symbol requires the molten metal flow and blast resistance to the closed space (hole), so the dot diameter W of the second marking material 2 is set to ensure visibility. , 1.8mm was grasped. In other words, when the diameter W was less than 1.8 mm, it was confirmed that the diameter W of the dot symbol after casting was severely deteriorated and sufficient visibility could not be secured.

  FIG. 12 is a characteristic diagram showing visibility between dot symbols after ductile casting of Example 1. The horizontal axis represents the interval between the dot symbols of the second marking material 2 before casting, and the vertical axis represents the interval between the dot symbols after casting. After passing through the casting process described in FIG. 7, it was examined whether the visibility of the dot symbol interval after casting with respect to the dot symbol interval of the second marking material 2 could be secured. According to this, it has been found that the interval between dot symbols that needs to ensure the visibility of each dot symbol after casting must be designed to be 0.45 mm or more. In other words, it was confirmed that when the interval was less than 0.45 mm, the interval between the dot symbols after casting was severely deteriorated and sufficient visibility could not be secured.

13 and 14 are flowcharts showing the manufacturing data management method of the first embodiment, FIG. 17 is a process table showing the manufacturing process of the first embodiment, and FIG. 18 is a casting condition data sample of the first embodiment.
In step S1, a production plan for various products for one day is created and registered by the production management computer MC. Specifically, the product number and the identification number corresponding to each ladle 31 and the detailed production plan information for each ladle such as the production amount and the production time corresponding to the product number are drafted, and production instructions are given.
In step S2, the first and second marking materials 1 and 2 are formed in accordance with an instruction from the production management computer MC based on the planned production plan. Specifically, the first marking material 1 consisting of alphabets and numerals as the product number and the identification number and the second marking material 2 consisting of dot symbols are formed by the numbering equipment, and the first marking material 1 is used as a management code. The second marking material 2 is combined and pasted on the cavity surface of the main mold in advance. At this time, the product number / identification number information (1) is output to the production management computer MC.

In step S3, the sand processing which adds and stirs a predetermined additive etc. to the sand used for a sand mold is performed.
FIG. 15 is a flowchart showing the sand treatment of the first embodiment.
In step S31, fresh sand, additives, and moisture are added to the regenerated sand and kneaded.
In step S32, compressive strength and CB value (compactability) analysis are performed.
In step S33, the analysis data in step S32 and the manufacturing data (3) of the sand mold processing conditions (processing amount, processing start time, additive information, kneading information, etc.) are output to the production management computer MC.

In step S4, a sand mold is produced on the production line using the main mold to which the management code of step S2 is attached and the sand processed in step S3.
In step S5, a core is inserted into the sand mold as necessary, and the sand mold (mold) is moved to a predetermined position on the production line for pouring. The manufacturing information (3) of the sand mold and core is linked to the management code of the main mold and recorded in the database (external record).

In step S6, a molten metal process is performed. FIG. 16 is a flowchart showing the melt processing of the first embodiment.
In step S61, a molten metal containing iron as a main component is produced in a melting furnace (source hot water).
In step S62, principal component analysis (Fe, C, etc.) is performed.
In step S63, the hot water is discharged, and the production result information (the hot water time, the hot water temperature, the main component information, etc.) of the hot water is output to the production management computer MC as manufacturing data (2).
In step S64, the spheroidizing agent and the inoculum are added in the ladle 31 that performs the treatment. Specifically, according to the production plan, the molten metal mainly composed of iron, which is the main hot water in the melting furnace 30, is transferred to a ladle in small portions, and a spheroidizing agent such as Mg and an inoculating agent such as Mn and Cu. To adjust the chemical composition.
In step S65, it transfers to the pouring ladle for pouring into the sand mold | type 104, and moves to the predetermined position of the production line which should be poured. Information (4) such as the inoculum of the ladle 31 is recorded in the database DB (external record) together with the ladle number.

  In step S7, for example, the bar code attached to the mold at the stage when the first sand mold 104 and the ladle 31 corresponding to each ladle comes to a predetermined position on the production line to be poured with the bar code reader. Based on the easily recognizable position information, it is sent to the production management computer as production result information such as a management code (product number and identification number), ladle number, production start time and the like. When the current ladle 31 is changed to the next ladle 31, a dot cutting command is output to the robot computer RC, and the management code is changed according to the change of the ladle 31.

  Here, for the material component information, test pieces that can be analyzed when each ladle is poured into the sand mold 104 are simultaneously prepared, and the material components are analyzed using the test pieces. As an analysis method, ICP emission spectral analysis, fluorescent X-ray diffraction, or the like is performed. In ICP emission spectroscopic analysis, an analysis sample is dissolved in an acid aqueous solution, the sample solution is atomized, and high frequency induction plasma is generated with argon gas. And a sample solution is issued in it, and a quantitative chemical composition is specified from the wavelength peculiar to each element and its luminescence intensity. In X-ray fluorescence analysis, an analysis sample is irradiated with X-rays, and a quantitative chemical composition is identified from the fluorescent X-rays specific to each emitted element.

  The analysis result and ladle number are sent to the production management computer MC as production result information (4), and the management code (product number and identification number), ladle number, component information, work time, etc. are linked. At this time, if necessary, an operator registered by a person in charge directly related to each process is selected and similarly managed as production result information.

  In step S8, a drum cooler process is performed. Specifically, the casting (product) and the sand mold 104 are cooled, and after the cooling is completed, the casting and the sand mold 104 are put into the rotating drum, and water is poured while rotating the rotating drum to remove the sand. At this time, as the sand removal condition information (5), the processing start time, the water injection time, the water injection amount, and the rotation speed are managed as manufacturing data. Then, the sand removal condition information is associated with the product number and the identification number in manufacturing data management.

  In step S9, a dam folding process is performed. Specifically, surplus mold parts such as gates and runners are removed. At this time, as the surplus molding part removing condition information (6), the processing start time, the gate removing pressure, the pressing pressure and the like are managed as manufacturing data. Then, the surplus molding part removing condition information is associated with the product number and the identification number in manufacturing data management.

  In step S10, a blast process is performed. Specifically, a sand removal finishing process and a finishing process of a casting (product) are performed. At this time, as the blast condition information (7), the processing start time, the processing time, the current value, and the like are managed as manufacturing data. The blast condition information is associated with the product number and the identification number in manufacturing data management.

  In addition, when different ladles 31 are confused in the production process such as the weir folding process and the blast process, the condition information of each process is based on the start time and processing time for each ladle. Collect as information. And it can manage as process information in a ladle unit by extracting as two parameters, such as a standard deviation, as an average value and variation amount of a changing condition.

  In step S11, an inspection process is performed. Specifically, the appearance inspection, strength inspection, hardness inspection, nest and hot water boundary of the casting (product) are confirmed, and the inspection result information (8) is managed as manufacturing data. Then, the inspection result information is associated with the product number and the identification number in manufacturing data management.

In step S12, the casting (product) is shipped and delivered. At this time, the shipment / delivery status of the casting (product) linked to the production number and the identification number is managed as shipment / delivery information (9) for inventory management.
In step S13, quality information at the customer is managed as manufacturing data (10) for suppressing recall for the product corresponding to the product number and the identification number.

Molding data collected from the above steps is output to the production management computer MC and then stored in the database DB. The quality factor / effect analysis computer AMC performs quality factor / effect analysis based on information stored in the database DB.
FIG. 19 is a flowchart showing the quality factor effect analysis process according to the first embodiment.
In step S101, the product number and the identification number are encoded.
In step S102, the identification number and various production process information are linked.
In step S103, the identification number and the quality inspection result are linked.
In step S104, the good and defective phenomena are classified.
In step S105, a correlation analysis between the production process information (control factor) affecting the quality and the inspection result is performed.
In step S106, the production process information (control factor) that realizes quality improvement is reviewed and determined.

FIG. 20 is a flowchart showing an analysis process when a product having a problem in strength (hereinafter referred to as a strength NG product) is produced in the quality factor effect analysis process of the first embodiment.
In step S201, based on the information (1) to (7) collected in the production process and the inspection result information (8), the association information of the strength NG product is extracted.
In step S202, the strength NG is analyzed by analysis such as data mining from the past database information (1) to (8) of the product having no problem in strength (hereinafter referred to as strength OK product) and the strength NG product (1) to (8). Extract the pattern leading to the product.
In step S203, the database analysis result is compared with the current strength NG product phenomenon and production process information. For example, one of the causes is grasping that the amount of Mg added to the ladle in the production process information (4) is small and the pouring time is long.
In step S204, a production process necessary for quality improvement and its condition extraction are performed. For example, with respect to the cause ascertained, measures are taken to increase the amount of component Mg added to the ladle of the production process information (4) and shorten the pouring time.
In step S205, the production process information (control factor) that realizes stable strength is reviewed, and necessary measures are applied to necessary portions.

[Effect of Example 1]
Hereinafter, in Example 1, the following effects are obtained.
(I) A casting product in which a management code is provided on the molding surface of the main mold 10 for casting the sand mold 104 for casting, and the management code is cast, and the management code is a plurality of characters formed in a convex shape And a combination character string including a plurality of convex dots and a dot symbol which is a special symbol capable of changing the dot pattern.
Therefore, it is possible to change the dot symbol pattern by excising the dots, and the management code can be quickly changed without affecting the casting tact time.
(Ii) The dot diameter was set to 1.8 mm or more. Thereby, casting transferability can be ensured, and visibility and identification of dots after casting can be ensured.
(Iii) The interval between dots was set to 0.45 mm or more. Thereby, casting transferability can be ensured, and visibility and identification of dots after casting can be ensured.
(Iv) The dot has a tip portion 2b having a tapered tip portion. Therefore, casting transferability can be ensured, and visibility and identification of dots after casting can be ensured.
(V) It has a straight portion 2a formed at the base of a dot and having a certain extending section having the same cross-sectional shape. Therefore, it is possible to ensure dot cutting performance.
(Vi) The tip of the dot has a flat shape. Therefore, a stable dot shape can be secured by avoiding an excessively thinned portion.

(Vii) A casting product data management method for registering and managing casting product manufacturing data in a database, and comprising a plurality of convex dots on a molding surface of a main mold 10 for molding a sand mold 104 for casting. A marking material in which a management code composed of a combination character string including a dot symbol, which is a special symbol capable of changing the dot pattern, is provided, a sand mold is formed by the main mold, and the management code is generated by the sand mold. The casting product is casted, and the management code and the manufacturing data of the casting product are associated with each other and registered in the database DB for management.
That is, it becomes possible to change the pattern of the dot symbols by excising the dots, and the management code can be changed quickly without affecting the tact time of casting. The traceability of the product can be improved by managing the management code and the manufacturing data in association with each other.

(viii) The management code is set by a production instruction based on the production plan. Therefore, a management code according to the production plan can be given.
(ix) The dot was changed for each ladle 31, and the production data of the product, ladle 31 and sand mold 104 was linked to the management code. Therefore, the casting process information can be managed for each product.
(x) When the core is attached, the manufacturing data of the core is further linked. Therefore, the casting process information can be managed for each product.
(xi) In the first embodiment, the dots are changed for each ladle 31, but the dots may be changed for each sand mold 104. Thereby, the information of a casting process can be managed for every product.
(xii) When the dot is changed for each sand mold 104, when the core is attached, it is desirable to further associate the manufacturing data of the core. Thereby, the information of a casting process can be managed for every product.

(xiii) When changing a dot, the management code is changed by cutting a preset dot. Thereby, the management code can be quickly changed without affecting the tact time of casting.
(xiv) When cutting dots, the robot RB automatically cuts them. Therefore, the management code can be accurately changed based on the command signal from the production management computer MC.
(xv) The robot RB has scissors as a cutting tool. Therefore, some dots can be cut accurately based on the command signal from the production management computer MC.
(xvi) The cutting instrument is not limited to scissors, and may include a knife or the like.

  (xvii) A method of casting a management code on a sand mold casting product, wherein a plurality of characters and a plurality of convex dots are formed on the cavity surface of the main mold 10 for forming the sand mold 104 for casting. The marking material formed with the dot symbol, which is a special symbol capable of changing the dot pattern, is attached, the sand mold 104 is formed by the main mold 10, and the management code is cast by the sand mold 104. Cast casting products. Therefore, it is possible to change the dot symbol pattern by excising the dots, and the management code can be quickly changed without affecting the casting tact time.

[Example 2]
FIG. 21 is a partial cross-sectional view (between BB ′ in FIG. 1) of convex dot symbols in the second marking material of Example 2. In the first embodiment, the tip 2b is linearly tapered. On the other hand, in Example 2, it has the front-end | tip part 2b1 from which a front-end | tip becomes curvilinear. Thereby, the same effect as Example 1 is acquired.

Example 3
FIG. 22 is a diagram illustrating a marking material for a character string for casting according to the third embodiment. The second marking material 3 for casting the dot symbol of Example 3 is formed of a thermoplastic resin and has a groove 4 on the outer periphery of the dot. In the numbering equipment, as in Example 1, the marking material may be separately manufactured and adhered with an adhesive, or as a different method, a letter plate such as alphabets and numbers and a shape of a dot symbol are created. The marking material may be attached to the main mold 10 using a (registered trademark) coated letter mold. Specifically, a method of aligning the character type, filling the character type in a high-temperature state in which a thermoplastic resin such as polyethylene or polypropylene is liquefied, and fixing the character type to the main die 10 by cooling and individualizing It is. At this time, the fixing method to the main mold 10 can be fixed by the anchor effect at the time of filling the resin by previously roughening the surface with a blast or the like at a place where the thermoplastic resin is fixed. Moreover, since it is the same kind of resin even in the state where the same resin remains in the roughened portion after the second time, it can be easily fixed.

  FIG. 23 is a partial cross-sectional view (between BB ′ in FIG. 22) of convex dot symbols in the second marking material of Example 3. As shown in FIG. 23, the dot symbol portion of the second marking material 3 has a convex shape with a height h2 from the plate surface in the cross section. The height h2 is set to a height at which the difference between the height before cutting the dots and the height after cutting the dots is sufficiently visible after casting. The convex shape has a tapered tip portion 3b formed on the tip side. Therefore, the moldability at the time of sand mold making and the oil circulation property at the time of casting are ensured. In addition, the tip of the tip portion 3b of Example 3 has a flat shape, and a stable dot shape is ensured by avoiding an excessively thin portion.

  FIG. 26 is an enlarged view showing a heating tool for the second marking material of Example 3, and FIG. 27 is a schematic diagram showing a heating deformation process for the second marking material of Example 3. A heating iron 106 is attached to the tip of the robot RB. The heating iron 106 of Example 3 has a function of deforming by heating and pressing a dot formed of a thermoplastic resin. For example, each time the molten metal is divided (distributed) in the ladle 31, the dot symbol of the second marking material 3 is melted by heating a predetermined portion of the dot symbol with a heating iron 106. Then, by accommodating the deformed portion in the groove portion 4, the display of the special symbol can be easily changed. Therefore, the management code can be changed for each ladle 31.

  24 and 25 are modified examples of partial cross-sectional views of convex dot symbols in the second marking material. You may form a front-end | tip part with a smooth curve as shown in FIG. Moreover, as shown in FIG. 25, you may form in the cone shape which does not have a straight part. This is because there is no need to cut as in the first embodiment. At this time, since the amount of resin that is deformed during heating can be suppressed, it is easy to ensure flatness after the deformation of the dots.

[Other Examples]
FIG. 28 is a schematic diagram showing the arrangement of dot symbols and the counting method of another embodiment. As shown in FIG. 31, different numbers of dots are formed in a plurality of rows. Then, the number of remaining dots may be recognized as a numerical symbol as it is by cutting or heating and deforming each of the dot rows one by one. In this case, a third party can easily recognize the meaning of the symbol without applying special rules.

  29 and 30 are schematic diagrams showing the arrangement of dot symbols and the counting method of another embodiment. As shown in FIG. 29, eight dots may be arranged evenly in the circumferential direction, and the dots may disappear in the clockwise direction to be recognized as numeric symbols 0 to 8. In addition, as shown in FIG. 30, three vertical dots and three horizontal dots are formed, a part of the dots are cut and disappeared, and the number of disappeared (or remaining number) is counted or a pattern Recognize by recognition. Specifically, when all the dots remain, it is recognized as “0”, and when all the dots are lost, it is recognized as “9”.

  FIG. 31 is a schematic diagram showing the arrangement of dot symbols in another embodiment. In the above-described embodiment, a dot having a circular cross section is used, but a dot having an elliptical or oval cross section may be used. Further, a variety of information may be recognized by combining dots having an oval or oval cross section, dots having a square cross section, and dots having a circular cross section.

  FIG. 32 is a diagram illustrating a marking material for a character string for casting according to another embodiment. In the marking materials of Examples 1 and 3, one second marking material 2 and 3 for casting a dot symbol is arranged at the end of a plurality of first marking materials 1 for casting alphabets and numbers. . On the other hand, a plurality of second marking materials 2 and 3 may be arranged on a plurality of first marking materials 1. Specifically, a plurality of second marking materials 2 and 3 are arranged so as to sandwich two first marking materials 1, or a plurality of second marking materials 2 and 3 are arranged for each first marking material 1. It is good. Thereby, the deformation | transformation of the dot character by the collision of each other product can be suppressed in the process of mold separation after casting and sand removal.

  FIG. 33 is a schematic diagram showing a marking material installation position of a character string for casting according to another embodiment. As shown in FIG. 33, a marking material area 10a for attaching a marking material to the main mold 10 is provided. This marking material area 10a is a region that is recessed deeper than the thickness of the marking material. By applying the marking material in this region, the dot is formed by the collision of each other product in the process of mold release after casting and sand removal. Character deformation can be suppressed.

  FIG. 34 is an example of a product having a marking material area in another embodiment, and FIG. 35 is an example of taking a large number of products having a marking material area in another embodiment. For example, when the brake caliper 200 of the vehicle brake device is cast, as shown in FIG. 35, a plurality of brake calipers are cast from one sand mold, and then the mold is released. At this stage, in addition to the brake caliper 200, a runner and a gate remain. From this state, a dam folding process and a blasting process are performed to obtain one brake caliper 200. At this time, as shown in FIG. 34, a marking material area 201 partially depressed is formed on the side surface of the brake caliper, and a management code formed by the marking material is formed here. Thereby, the deformation | transformation of the dot character by the collision of a mutual product can be suppressed in the process of mold separation or sand removal.

  FIG. 36 is a diagram showing a marking material in another embodiment. As shown in FIG. 36, all the marking materials are formed with only dots, and by performing subdivision management such as lot numbers and ladle units to be managed daily, a management code reflecting the casting process is further set. Also good.

DESCRIPTION OF SYMBOLS 1 1st marking material 2 2nd marking material 2a Straight part 2b Tip part 2b1 Tip part 3 2nd marking material 3b Tip part 4 Groove part 10 Main mold 10a Marking material area 10d Lower main mold 10u Upper main mold 11 Mouth 30 Melting furnace 31 Ladle 32 Adjustment device 102 Lower sand mold 103 Upper sand mold 104 Sand mold 105 Cutting hand 106 Heating iron 200 Brake caliper 201 Marking material area
AMC Quality factor effect analysis computer
DB database
MC production management computer
RB robot
RC robot computer

Claims (4)

A casting product in which a management code is provided on a molding surface of a main mold for molding a casting sand mold, and the management code is cast,
The management code is displayed as a combination character string composed of a plurality of characters formed in a convex shape and a special symbol composed of a plurality of convex dots and the dot pattern being changeable. A casting product with a management code cast out. A casting product data management method for registering and managing casting product manufacturing data in a database,
Marking in which a management code consisting of a combination character string composed of a plurality of convex dots and a special symbol that can change the pattern of the dots is formed on the molding surface of the main mold for molding a sand mold for casting Material,
A sand mold is formed by the main mold, and a cast product in which the management code is cast by the sand mold is cast,
A manufacturing data management method for casting products, wherein the management code and manufacturing data for casting products are associated with each other and registered and managed in a database. A marking material that is attached to the molding surface of a main mold for molding a casting sand mold and formed with a management code cast into a cast product,
The management code is displayed as a combination character string composed of a plurality of characters formed in a convex shape and a special symbol composed of a plurality of convex dots and the dot pattern being changeable. The main marking material for mold molding. A method of casting a management code on a sand mold casting product, comprising a plurality of convexly formed characters and a plurality of convex dots on a cavity surface of a main mold for forming a sand mold for casting. A special symbol that can change the pattern, and a marking material that forms
A sand mold is formed by the main mold,
A casting method for sand mold casting, wherein a cast product in which the management code is cast by the sand mold for casting is cast.

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