JP2005288450A - Casting die, and casting method for forming die using the same casting die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a casting die, which prevents product defects due to a shrinkage cavity from occurring by accelerating solidification of a specified part of a casting at the time of solidification, and to provide a casting method for a forming die using the casting die. <P>SOLUTION: The casting die is composed to partially control solidification of a casting as follows: the die has an upper die 3 and a lower die 4, which have split dies 3a and 4a respectively; a cooling means 5 is arranged in the split dies 4a, especially in the split dies 4 to individually cool each split die 4a; the cooling means 5 consists of a cooling passage formed inside each split die 4a and a cooling medium, not illustrated, being allowed to flow in the cooling passage; and a temperature sensor for detecting the temperature of each split die 4a is arranged inside each split die 4a. The temperature of each split die 4a is constantly detected by the temperature sensor, and, when the temperature of a specified split die 4a becomes a predetermined temperature, a cooling-medium supplying means is controlled to start cooling and to cool only the specified split die 4a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a casting mold and a casting method of a molding mold using the casting mold, and more specifically, the casting sink (the casting sink is a casting sink) by promoting solidification of a specific portion during casting solidification. The present invention relates to a casting mold that prevents product defects due to a phenomenon in which the last solidified portion is recessed when the molten metal is solidified, and a casting method of the molding mold using the casting mold.

  Conventionally, when a molding die (die for manufacturing a product) is manufactured by casting by combining a gypsum mold and a casting die, a phenomenon called casting sink is likely to occur. Cast sink is a phenomenon in which when the molten metal solidifies, the last solidified portion is dented.The cast sink itself is not a malfunction, but if a cast sink occurs in a cast product, it may cause a product defect. is there.

  Therefore, in addition to the “product part”, it is necessary to provide a so-called “push-up part” that serves to replenish the molten metal with respect to the solidification shrinkage, but the “casting sink” remains in the product part. And product failure.

  One of the causes is slow solidification shrinkage of the product part. As a countermeasure against this, it is necessary to promote solidification centering on the location where the “casting sink” of the product portion is generated. As a means for promoting this solidification, it is generally effective to cool the inside of the casting mold, but the entire casting mold is cooled, and the specific portion where the “casting sink” is generated is cooled. There was a problem that solidification promotion could not be performed reliably.

In addition, a conventional casting mold discloses a technical idea of cooling a mold by dividing it into two parts in order to improve the mold life (countermeasure against cracking of thermal stress) (for example, Patent Document 1). In particular, it is difficult to effectively prevent the occurrence of “cast iron sink”.
JP 2002-120044 A

  The present invention pays attention to such a conventional problem, and by promoting the solidification of a specific part at the time of casting solidification, a casting mold capable of preventing a product defect due to casting sink and its casting mold An object of the present invention is to provide a method for casting a molding die using the above.

  In order to achieve the above object, the present invention provides a casting mold according to the present invention, which is a casting mold formed by dividing a mold into a plurality of divided molds, and each of the divided molds is divided into the divided molds. The gist is that a cooling means capable of individually cooling the mold is provided.

  Here, the cooling means is constituted by a cooling passage formed in each divided mold and a cooling medium flowing through the cooling passage, and cooling water or cooling air is used as the cooling medium. Moreover, it is also possible to provide each of the divided molds with a temperature sensor that detects the temperatures inside the mold and the casting surface.

  Further, according to the method of casting a molding die using the casting die of the present invention, when casting a molding die by combining a gypsum mold and a plurality of divided casting dies, each of the divided dies is used. The gist is to cast the molding die while individually cooling by the cooling means.

  Further, when casting the molding die, the temperature of each split die and the casting surface is detected by a temperature sensor provided in each split die, and when the split die and the casting surface reach a predetermined temperature, Cooling is started by the cooling means.

  In this way, it is possible to control the solidification of the casting by dividing the casting mold at an arbitrary location, providing cooling means in the divided mold, and controlling the cooling of each divided mold independently. And prevent product defects.

  In the present invention, as described above, the casting mold is divided at an arbitrary position, and the cooling means is provided in the divided mold so that each of the divided molds is controlled to be cooled independently. It is possible to control solidification in an effective manner and to promote solidification at a specific location during solidification of a casting, thereby preventing a product defect due to casting sink.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is an exploded perspective view of a plurality of casting molds divided with a plaster mold embodying the present invention, FIG. 2 is a sectional view during casting, FIG. 3 is a plan view of the divided molds, and FIG. AA arrow sectional view is shown, 1 is a casting mold, 2 is a gypsum mold, and the casting mold 1 is an upper mold 3 constituted by a divided mold divided at an arbitrary position X And the lower mold 4.

  As shown in FIGS. 1 and 2, the gypsum mold 2 is manufactured in the shape of a product casting W by a pre-process, and is disposed between the upper mold 3 and the lower mold 4, and is formed in the gap G. Product castings are manufactured by pouring and solidifying molten metal.

  In the present invention, as described above, for the purpose of controlling the partial solidification of the casting, the divided molds 3a and 4a of the upper mold 3 and the lower mold 4, particularly the divided mold 4a of the lower mold 4 are divided into the divided molds. A cooling means 5 capable of individually cooling the mold 4a is provided. The cooling means 5 is constituted by a cooling passage 6 formed in each divided mold 4 a and a cooling medium (not shown) (for example, cooling water or cooling air) that circulates in the cooling passage 6. Are connected to a cooling medium supply means for supplying a cooling medium, for example, a cooling water pump or a cooling air blower.

  Further, the cooling medium is provided with a switching valve or the like in the supply pipe so that it can be supplied as needed into the divided individual molds 4a. Each split mold 4a is provided with a temperature sensor 7 for detecting the individual temperature of the split mold 4a, and the temperature at the time of casting of each split mold 4a is always detected to split a specific portion. When the mold 4a reaches a predetermined temperature (for example, 550 ° C. to 650 ° C. in the case of an animi casting), the cooling medium supply means is controlled to start cooling, and the divided metal at a specific location is further started. Only the mold 4a is cooled.

  The temperature sensor 7 can detect not only the temperature at the time of casting of each divided mold 4a but also the temperature of the casting surface at the same time.

  As described above, since the divided mold 4a is controlled to be cooled independently, partial solidification control of the casting becomes possible, and solidification of a specific portion at the time of casting solidification is promoted to prevent a product defect due to casting sink. It can be done.

  In this embodiment, the cooling means 5 of the divided mold 4a of the lower mold 4 has been described. However, the temperature of the divided mold 3a of the upper mold 3 can also be controlled as described above.

  Next, a description will be given of a casting method of a molding die to be a product. When casting a molding die by combining a gypsum mold 2 and a plurality of divided casting dies 1, each of the divided dies 4 a The mold is cast while being individually cooled by the cooling means 5. At this time, the temperature sensor 7 provided in each divided mold 4a simultaneously detects the temperature of each divided mold 4a and the temperature of the casting surface, and the cooling means 5 when the divided mold 4a reaches a predetermined temperature. Thus, cooling can be started, and only the divided mold 4a at a specific location can be cooled.

  As described above, the casting mold 1 is divided at an arbitrary position, the cooling means 5 is provided in the divided mold 4a (3a), and the cooling control of each divided mold 4a (3a) is independently performed. Thus, partial solidification control of the casting becomes possible, and product defects can be prevented.

It is an exploded perspective view of a plurality of casting molds divided with a plaster mold embodying the present invention. It is sectional drawing at the time of casting. It is a top view of a division mold. It is AA arrow sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casting die 2 Gypsum mold 3 Upper die 3a Division die 4 Lower die 4a Division die 5 Cooling means 6 Cooling passage 7 Temperature sensor W Product casting X Arbitrary place G Gap

Claims (6)

A casting mold formed by dividing a mold into a plurality of parts,
A casting mold characterized in that a cooling means capable of individually cooling each divided mold is provided inside the divided mold. 2. The casting mold according to claim 1, wherein the cooling means includes a cooling passage formed in each divided mold and a cooling medium that circulates in the cooling passage. The casting mold according to claim 2, wherein the cooling medium is cooling water or cooling air. The casting mold according to claim 1, 2 or 3, wherein each of the divided molds is provided with a temperature sensor for detecting the temperature inside the mold and the surface of the casting. When molding molds by combining a gypsum mold and a plurality of divided casting molds, the molding molds are cast by individually cooling the divided molds by cooling means. Method. When casting the mold, the temperature of each split mold and the casting surface is detected by a temperature sensor provided in each split mold, and when the split mold and the casting surface reach a predetermined temperature, the cooling means The method for casting a molding die according to claim 5, wherein the cooling is started.

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