JP2005329441A - Deburring method for aluminum casting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deburring method for an aluminum casting, by which a burr generated on an aluminum casting is automatically removed without damaging the surface of the casting and easily removed without using a complex device so that prevention of a human error and reduction of cost are simultaneously realized. <P>SOLUTION: The deburring method is a method of removing a burr of an aluminum casting by jetting a projection material to the aluminum casting. A plastic projection material containing thermosetting resin as a main component and having a particle diameter in the range of 100-2,000 μm is used as the projection material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for removing burrs from an aluminum cast product, and more particularly, to a method for removing burrs from an aluminum cast product, in which burrs generated in an aluminum cast product are removed by blasting.

  In various automobile parts manufactured by casting, aluminum wheels for four-wheeled vehicles and two-wheeled vehicles, so-called cast burrs are generated when molten metal enters the voids of the mold. Conventionally, the removal of burrs generated in the machining process of such cast products, especially aluminum cast products with relatively low hardness, should not damage the machined surface, so use an air sander (polishing machine using air) or the like. Used to be done manually.

Further, as a technique relating to removal of burrs from cast aluminum products, for example, Patent Document 1 discloses a burr of an aluminum wheel including a control robot having a wrist portion that can be rotated and linearly reciprocated, with a processing tool and a force sensor fixed thereto. A take-off device is described. Further, Patent Document 2 discloses an extrusion trace finishing device that finishes extrusion traces, a deburring device that finishes overflow and runner gate traces, and a surface finish that cleans the top, side, and inclined surfaces of a workpiece. An apparatus for finishing an aluminum die cast product comprising the apparatus is described.
JP-A-8-243909 (Claims) JP 2002-307277 A (Claims etc.)

  However, since the conventional method using an air sander is a manual operation, it takes a very long time when there are a large number of processed surfaces, which increases the cost. In addition, when the processed surface has a complicated shape, not only is it time-consuming, but there is a case where a portion that does not require processing is damaged due to human error. Furthermore, since it is a manual work, there is a risk of cutting not only the burr part but also the product itself, and it has been desired to solve these problems.

  Further, in the case of the methods described in Patent Documents 1 and 2, although it is possible to automatically remove burrs, there is a problem that the cost of the apparatus increases because a complicated apparatus is required, and casting is performed. Since the place where the casting burr to be removed differs depending on the shape of the product, there is also the inconvenience that the control and adjustment of the apparatus are necessary.

  Accordingly, an object of the present invention is to remove burrs generated in an aluminum casting product automatically and without complicated devices without damaging the surface, thereby preventing human error and An object of the present invention is to provide a method for removing burrs from an aluminum casting that can simultaneously reduce costs. Another object of the present invention is to impart an aesthetic appearance that cannot be obtained by cutting processing to the entire burr removing portion.

  As a result of intensive studies, the present inventors have automatically removed burrs in an aluminum cast product without damaging other than the removal site by using a blasting process using a predetermined resin abrasive. As a result, the present invention has been completed.

That is, the method for removing burrs in an aluminum cast product of the present invention is a method for removing burrs from the aluminum cast product by blasting by spraying a projection material on the aluminum cast product,
As the projection material, a plastic projection material having a particle size of 100 to 2000 μm mainly composed of a thermosetting resin is used.

  In the present invention, it is preferable to spray the projection material simultaneously from two directions on the burr, and it is more preferable to spray the projection material simultaneously from both sides sandwiching the burr.

  Further, the projection material is preferably collected after spraying and repeatedly circulated for use. Further, as the blasting device, an air blasting device can be suitably used, and the plastic projection material is particularly a pulverized product of a thermosetting resin molded product having a particle size in the range of 50 to 1000 μm, It is preferable to use a pulverized product in which the particle is an irregular polyhedron having a substantially sharp ridgeline and the particle size is approximately homogenized for each classification step.

  Further, as the spray nozzle for the plastic projection material, the inner diameter is increased at a spread angle θ of 0.5 to 1.5 ° with respect to the longitudinal direction of the nozzle from the end of the inner throat portion toward the tip of the outlet, thereby forming a taper shape. In addition, it is preferable to use one having a ratio (B / A) of a length B from the terminal end of the throat part to the outlet tip and a diameter A of the throat part of 10 or more.

  After the removal of the burrs, it is preferable that the entire burrs removed are blasted substantially uniformly. The present invention can be suitably applied to an aluminum wheel as the aluminum casting.

  According to the present invention, only the burrs can be easily removed without damaging the surface of the aluminum casting by adopting the above-described configuration. In addition, since it is possible to perform the removal automatically unlike the conventional manual operation, it is possible to eliminate human error and contribute to cost reduction. Furthermore, if an air blasting device is used, it is possible to remove the burr portion uniformly.

  In addition, Zn, Cu, etc., which are metals with relatively low hardness, can be used as the projecting material, but since Zn deposits a dull color on the aluminum base, it is generally used for painted products. Can not. On the other hand, if Cu remains in aluminum, it will corrode the base material, so it cannot be used. In the present invention, by selecting a plastic projection material as a low-hardness projection material, the surface of the aluminum casting product is not damaged significantly, but rather a fine surface can be formed, giving an aesthetic appearance to the aluminum casting product. It becomes possible to do.

Hereinafter, preferred embodiments of the present invention will be described in detail.
The method for removing burrs from an aluminum cast product according to the present invention is a method for removing burrs from an aluminum cast product by blasting by spraying the projection material onto the aluminum cast product, and a thermosetting resin as a main component is used as the projection material. It is characterized in that a plastic projection material having a particle diameter of 100 to 2000 μm is used.

  In the present invention, since burrs are removed using blast processing, the automation of the removal operation can shorten the work time and reduce costs, and can prevent the occurrence of human error. . Further, since the plastic projection material having the predetermined particle diameter is used as the projection material, there is no possibility of damaging the aluminum surface.

  Here, since removal of burrs is usually performed in the manufacturing process, rapid processing is required. However, since the plastic projection material according to the present invention has a relatively low hardness, the burring generation direction can be changed, that is, the burring generation portion can be changed only by bending, so that the burring generation portion can be removed. There may not be. In this case, if blasting is then performed from the opposite direction, it will be bent in the opposite direction in the same manner as described above, and this can be finally removed by repeating this several times. It can be said that it is practically impossible to do this.

Therefore, in the present invention, in order to perform a more efficient deburring operation, it is preferable to use a method in which the projection material is simultaneously sprayed from two directions on the burr. As a result, instantaneous force is applied to the burrs from two directions, and the burrs are removed without bending due to the synergistic effect, and the burrs can be efficiently removed in a very short time. It becomes possible. Specifically, for example, as shown in FIG. 1 (a), the burr 1A in the aluminum cast product 10 is projected from two directions where the angle α _{A is} about 100 to 170 ° from both sides of the burr 1A. Blasting is performed by spraying materials simultaneously. On the other hand, for the burr 1B, as shown in FIG. 1B, blasting is performed from two directions where the angle α _{B is} about 190 to 260 ° from both sides of the burr 1B. That is, it is preferable that the arrangement angle in the two directions does not become 180 °. When the present invention is applied to an actual manufacturing process, it is possible to instantaneously and easily remove burrs by spraying from two predetermined directions simultaneously, depending on the size and the like. It becomes.

  In addition, depending on the state after removing the burr, the edge part after the removal can be further rounded by lightly licking (sanding) the part from which the burr has been removed using a manual screw sander or the like. Such an auxiliary treatment can be appropriately performed according to the purpose of removing burrs, such as the type of aluminum casting, and is not essential in the present invention. Further, even by blasting the deburring portion uniformly, a fine surface can be formed in the deburring portion, and beauty can be imparted.

  In the present invention, the thermosetting resin used for the projection material (blasting material) is not particularly limited. For example, melamine resin (melamine-formaldehyde resin), urea resin (urea-formaldehyde resin), A polycarbonate resin, a phenol resin, an epoxy resin, an unsaturated polyester resin, an acrylic resin, a guanamine resin, a polyurethane resin, and the like can be given. In addition, resins having hardness comparable to these resins can also be used. Such a projectile can be collected after spraying and repeatedly circulated about 30 to 40 times.

  As such a projection material, specifically, for example, a pulverized product of a thermosetting resin molded product having a particle size of 50 to 1000 μm, and each particle is an amorphous polyhedron having a substantially sharp ridgeline. In addition, a pulverized product having a substantially uniform particle size for each classification step can be suitably used. Such a pulverized product can be obtained by the method described in International Publication No. 00/45994.

  As the blasting device used in the method for removing burrs of the present invention, it is preferable to use an air blasting device, which makes it possible to uniformly remove burrs. Among them, a direct injection type air blasting device is suitable, but other types such as a centrifugal type and a barrel type can also be used, and are not particularly limited, and are appropriately selected and used depending on the application and usage environment. be able to.

  Further, the nozzle used for spraying the plastic projection material is not particularly limited, and it is possible to appropriately select and use those usually used for blasting. In the present invention, particularly, the following will be described. It is preferable to use a nozzle having a predetermined shape. Specifically, from the end of the inner throat portion toward the outlet tip, the inner diameter is increased at a spread angle θ of 0.5 to 1.5 ° with respect to the longitudinal direction of the nozzle, and the end of the throat portion is formed. The ratio (B / A) of the length B from the outlet to the exit tip and the diameter A of the throat portion is 10 or more, and is a nozzle suitable as a high-speed nozzle dedicated to plastic abrasives.

  FIG. 2 shows an internal cross-sectional shape when the nozzle is cut along the longitudinal direction. As shown in the figure, the internal structure of the nozzle is composed of an inlet portion 21, a throat portion 22, and an outlet portion 23. The outlet portion 23 extends from the end of the throat portion 22 toward the outlet tip in the nozzle longitudinal direction. On the other hand, it has a taper shape in which the inner diameter is widened at a spread angle θ of 0.5 to 1.5 °, preferably 1.0 to 1.3 °. If the spread angle θ is less than 0.5 ° or exceeds 1.5 °, the peeling ability is unacceptably lowered.

  In the illustrated nozzle, the ratio (B / A) of the length B from the terminal end of the throat portion 22 to the tip of the outlet portion 23 and the diameter A of the throat portion 22 is 10 or more, preferably 15 to 25. . If this ratio is less than 10, the peeling ability is unacceptably lowered. On the other hand, it is practically impossible to design a nozzle exceeding 25.

  Although the burr removal method of the present invention can be used for all aluminum castings, it is particularly applicable to the removal of burrs from aluminum wheels. For example, when removing burrs formed on the outer peripheral edge of an aluminum wheel, using two blasting devices as desired, the injection locations of each nozzle are matched and the nozzles are swung in synchronization, By spraying the projection material and rotating the aluminum wheel at an appropriate rotational speed, it is possible to efficiently remove burrs from the entire aluminum wheel.

Hereinafter, the present invention will be described specifically by way of examples.
An aluminum wheel sample (Bercol hardness 80) having burrs 1A and 1B on the outer peripheral edge as the aluminum casting 10 is used. As shown in FIG. 1, the angle α _A = 150 ° formed from both sides of the burrs 1, and Blasting was performed by two nozzle arrangements where α _B = 210 °. As conditions for the blasting treatment, two direct pressure blasting apparatuses are used as the apparatus, and a resin projecting material manufactured by Bridgestone Corporation is used as the projecting material. Product name: MG-3 (particle size: 500 to 850 μm) and sprayed. The pressure was 0.45 MPa and the spraying distance was about 100 mm (the conditions were the same for both units). As the nozzle 20, the nozzle shown in FIG. 2 having a tip diameter of 6 mm was used.

  The spray locations of the two nozzles 20 are aligned with the burrs 1A, spraying is performed while the nozzles 20 are synchronized and rocked, and the aluminum wheel sample is rotated at a rotation speed of 0.75 rpm, and the processing time is 80 seconds. The burr 1A in the aluminum wheel sample could be completely removed. Further, when the surface of the aluminum wheel was checked after the treatment, no scratch was found. Further, when the blast treatment was similarly performed on the burrs 1B, the burrs 1B could be removed in a short treatment time, and no scratches were generated on the aluminum wheel surface.

  The deburring method of the present invention can be suitably used for removing cast burrs from various automobile parts and aluminum wheel castings for four-wheeled and two-wheeled vehicles, as well as other manufacturing industries such as electrical equipment, construction, and chemicals. It can be suitably applied to removal of cast burrs from various aluminum castings.

(A) And (b) is explanatory drawing which shows one suitable embodiment of the burr removal method of the aluminum castings of this invention. It is sectional drawing which shows an internal structure when the nozzle suitably applicable to this invention is cut | disconnected along a longitudinal direction.

Explanation of symbols

1 Burr 10 Aluminum casting 20 Nozzle 21 Inlet part 22 Throat part 23 Outlet part

Claims (9)

A method for removing burrs from an aluminum casting by blasting a spray material on the aluminum casting,
A method for removing burrs from an aluminum cast product, wherein a plastic projection material having a particle size of 100 to 2000 μm mainly composed of a thermosetting resin is used as the projection material.   The burr removing method according to claim 1, wherein the projecting material is simultaneously sprayed from two directions on the burr.   The burr removing method according to claim 2, wherein the projecting material is simultaneously sprayed from both sides of the burr.   The burr removal method according to any one of claims 1 to 3, wherein the projection material is sprayed and then collected and repeatedly circulated for use.   The burr removal method according to any one of claims 1 to 4, wherein an air blast device is used.   The plastic projection material is a pulverized product of a thermosetting resin molded product having a particle size in the range of 50 to 1000 μm, and each particle is an amorphous polyhedron having a substantially sharp ridgeline, and for each classification step. The method for removing burrs according to claim 1, wherein a pulverized product having a substantially uniform particle size is used.   As the spray nozzle of the plastic projection material, the inner diameter is increased at a spread angle θ of 0.5 to 1.5 ° with respect to the nozzle longitudinal direction from the end of the inner throat portion toward the outlet tip, and is tapered. The burr | flash as described in any one of Claims 1-6 using what the ratio (B / A) of the length B from the said throat part termination | terminus to the said exit front-end | tip and the diameter A of the said throat part is 10 or more. Removal method.   The burr removal method according to any one of claims 1 to 7, wherein after the burr is removed, the entire burr removal part is blasted substantially uniformly.   The method for removing burrs according to claim 1, wherein the cast aluminum product is an aluminum wheel.

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