JPH08257682A - Casting method for cast product having recessed part and device therefor - Google Patents

Abstract

PURPOSE: To easily set the necessary vol. of a core to the desirable position in a metallic mold by utilizing the magnetic force of a magnet and attracting the magnet type core to the part corresponding to the necessary position to a recessed part of the cast product in the metallic mold. CONSTITUTION: In the metallic mold part corresponding to the necessary position 14 to the recessed part of the cast product 11, the magnet type core 20 containing the magnet is attracted and fitted by this magnetic force. In the case the center line of the magnet type core 20 is inclined from the shifting direction of the metallic mold fitting the core, at the time of opening the mold, the core 20 is separated with the attracted surface from the metallic mold fitting this core and at the time of taking out the cast product 11 from the mold, the magnet type core 20 is taken out together with the cast product 11 from the mold. Thereafter, the magnet type core 20 is made to be taken off from the cast product 11. In the case the center line of the magnet type core 20 coincides with the shifting direction of the metallic mold fitting the core, at the time of opening the mold, the core 20 is moved together with the metallic mold and taken off from the cast product 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting method and apparatus for a cast product having a meat stealing portion.

[0002]

2. Description of the Related Art As shown in FIG.
When casting a wheel 1 (made of aluminum alloy) (automobile wheel), since the portion 4 where the rim portion 2 and the disc portion 3 intersect is thick, solidification of the molten metal is delayed and casting defects such as shrinkage cavities occur. Cheap. To prevent this by providing a meat stealing part in the thick part of the cast product, conventionally, engraving (concave) is formed in the mold part corresponding to the necessary part for stealing the cast product, and the sand core is placed there. It was installed and casting was performed.

[0003]

However, the prior art has the following problems. (A) It is difficult to freely attach the core of the required volume to a desired portion of the die, and the die cost becomes high. More specifically, if the cast product is a light alloy wheel and you try to attach a sand core for meat stealing of the thick part of the wheel to the mold part corresponding to the intersection of the rim part and the disc part, the meat stealing part It is not allowed to hit the rim bead seat part (because air leakage occurs because it is a seal part), so the sand core mounting position, size and shape are limited, It becomes difficult to attach it to the desired position. In addition, engraving (recess processing) must be provided in the die for attaching the sand core, which increases the die machining cost. (B) In the case of the sand core, when the molten metal is poured into the cavity and the molten metal comes into contact with the sand core, gas is generated from the sand core, and casting defects such as blow holes are likely to occur. (C) In the case of the sand core, since the sand core is destroyed at each casting, a large number of sand cores are required, which is not economical. An object of the present invention is to easily attach a core of a required volume to a desired portion of a mold, to prevent generation of gas from the core during pouring, and to maintain the core for a plurality of casting cycles. It is intended to provide a casting method and apparatus for a cast product having a meat stealing part, which can satisfy at least one of the conditions that it can be used as a product.

[0004]

Means for Solving the Problems The method and apparatus for casting a cast product having a meat stealing portion according to the present invention for achieving the above object are as follows. (1) A magnet type core including a magnet is attracted to a portion corresponding to a required portion for stealing meat of a casting using a magnetic force of the magnet, the die is closed and molten metal is poured into a cavity in the die. A method for casting a cast product having a meat stealing part, which comprises the steps of opening the mold after the molten metal has solidified and taking out the cast product from the mold. (2) Using a magnetic core of the magnet, the magnetic core of the magnet is used to adsorb to a portion of the mold corresponding to the required area for stealing the meat of the cast product, the mold is closed, and the molten metal is poured into the cavity in the mold. A method for casting a cast product having a meat stealing part, which comprises the steps of: after solidification of the molten metal, opening the mold, taking out the cast product together with the magnet type core from the mold, and then removing the magnet type core from the cast product. (3) From a die having a cavity for casting a cast product inside, and a magnet type core that includes a magnet and is detachably attracted to a cast product stealing necessary portion of the die by utilizing the magnetic force of the magnet Casting equipment for castings with a meat stealing part.

[0005]

In the method (1), since the magnet type core is magnetically attracted and attached to the mold, the core of the desired volume is relatively easily attached to the desired portion of the mold in the desired posture. be able to. Moreover, since it is not necessary to form an engraving on the mold at the time of mounting, the mold cost is reduced accordingly. Also, instead of using a magnetic core as a sand core,
Gas is not generated from the core at the time of pouring by using a ceramic to which a magnet is assembled or a ceramic powder and a magnetic powder mixed to form a composite body having a predetermined shape. Further, unlike the sand core, the magnet type core is not destroyed in each casting, and can be used multiple times, and is excellent in core economy. Above (2)
In addition to the effect of the above (1), in the method of (1), the casting is taken out from the mold together with the magnet core, and then the magnet core is removed from the casting. There is no need to worry about whether or not the core comes out of the cast product when it is attached to the cast product, and it becomes possible to more freely set the position, shape, and volume of the meat steal of the cast product. In the device of the above (3), since the core is a magnet type core, it has the same operation as described in the method of the above (1).

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A casting apparatus for a cast product having a meat stealing portion according to an embodiment of the present invention will be described with reference to FIGS. Figure 1,
In the embodiment of FIG. 2, the cast product is a wheel 11 made of a light metal (for example, an aluminum alloy), and the portion where the meat stealing is required is the rim portion 12.
It is shown that there is a thick wall portion 14 where the disk portion 13 and the disk portion 13 intersect, but the cast product is not limited to the wheel, and the portion requiring meat stealing is at the intersection portion of the wheel rim portion and the disk portion. It is not limited. The casting device 15
It is composed of a plurality of molds 16, 17, 18 divided from each other, and a magnet type core 20 attached to and attached to any of these molds by utilizing magnetic force. In the example of FIGS. 1 and 2, the mold includes a fixed lower mold 16 having a sprue 19, an upper mold 17 movable in the vertical direction, and a horizontal mold 18 divided into a plurality in the circumferential direction and movable in the lateral direction. Consists of. A closed cavity is formed in the mold when the mold is closed, and a molten metal (for example, an aluminum alloy molten metal) is pushed up and poured into the cavity through the gate 19. When the molten metal solidifies, it becomes a cast product 11.

A magnet type core 20 containing a magnet is attracted and attached to the mold portion of the cast product 11 corresponding to the meat stealing necessary portion 14 by its magnetic force.
When the cast product 21 is a wheel and the meat stealing required portion 14 is the intersection of the rim portion 12 and the disc portion 13, the magnet type core 20 is attached to the upper mold 17 as shown in FIG. 1, or As shown in FIG. 2, it is attached to the horizontal mold 18. The center line of the magnet core 20 may be tilted from the moving direction of the mold to which it is attached (vertical direction in the case of the upper mold 17, horizontal direction in the case of the horizontal mold 18). Is shown tilted. When the center line of the magnet-type core 20 is inclined from the moving direction of the mold to which the core is attached, the core 20 is opened when the mold is opened.
Is separated from the die to which it is attached at the attracting surface, and when the casting 11 is taken out of the die, the magnet core 20 is removed from the die together with the casting 11. Then, after that, the magnet core 20 is removed from the casting 11. When the center line of the magnet type core 20 coincides with the moving direction of the mold to which the core is attached, the core 20 moves together with the mold and comes off the casting 21 when the mold is opened.

As shown in FIG. 3, the magnet core 20 may be composed of a combination of a magnet piece 22 and a ceramic body 23 (which may be a combination of adhesive bonding or mechanical bonding). OK, or Figure 4
As shown in, it may be composed of a composite body 21 in which magnet powder and ceramic powder are mixed and formed into a predetermined shape (for example, by sintering). In the above, the ceramic powder in the case of the ceramic body 23 or the composite body 21 is
Any material other than ceramic may be used as long as it does not soften and does not generate gas even when exposed to the temperature of the molten metal, and may be, for example, a metal sintered material, a material obtained by machining the same material as the die, or the like. Good. The composite body 21 has an advantage over the adhesive type in that the magnet piece 22 and the ceramic body 23 are not separated from each other.

Next, a casting method for a cast product having a meat stealing portion according to an embodiment of the present invention (also a function of the above casting apparatus)
Will be described with reference to FIGS. According to the method of the embodiment of the present invention, the magnetic core 20 including a magnet is used to utilize the magnetic force of the magnet to correspond to a portion of the metal mold 16, 17, 18 which is required to steal the cast meat (when the cast is a wheel, The first step of adsorbing to the die portion corresponding to the intersection 14 of the rim portion 12 and the disc portion 13), and then closing the die 16, 17 and 18 to the spout 19 in the die cavity.
A second step of pouring a molten metal (for example, an aluminum alloy) through the molten metal, solidifying the molten metal, opening the mold, and taking out the casting 11 from the molds 16, 17, and 18. Another embodiment method of the present invention has, in addition to the first step and the second step, a third step of removing the magnet core 20 from the casting 11 after the second step. It consists of things. When the center line of the magnet type core 20 is inclined from the moving direction of the mold to which the core is attached, the mold is forcibly disengaged from the magnet type core 20 at the attracting surface when the mold is opened, and the casting product Since the magnet type core 20 is taken out together with the cast product 11 when the molds 16, 17, 18 of 11 are taken out, the step (third step) of extracting the magnet type core 20 from the cast product 11 after taking out the cast product is It will be necessary.

Regarding the operation of the above method, since the magnet type core 20 is attracted to the molds 16, 17 and 18 by a magnetic force, a concave portion for attaching the cores to the molds like a sand core is used. And the core can be attached to the rim bead seat portion of the wheel from the free direction such as the heel, and the volume of the core 20 can be set relatively freely by this attachment freedom. Is allowed. Then, by setting the volume of the core 20 to be large, the thick portion 14 of the cast product can be stealed largely, and the occurrence of shrinkage cavities due to the delay in solidification can be suppressed. Further, since the magnet type core 20 is composed of a ceramic body and a magnet piece, unlike the case of the sand core, it does not generate gas by touching the molten metal, and the generation of blow holes is suppressed. Further, since the magnet type core 20 is not destroyed in every casting unlike the case of the sand core, one magnet type core 20 can be repeatedly used for a plurality of castings, and the core economy is improved. Increase.

[0011]

According to the method of the present invention, the core is magnet type, and the magnet type core is attracted and attached to the die to perform casting.
It is easy to install, and it is easy to give the core the volume necessary for stealing meat. In addition, unlike the sand core, the magnet core does not generate gas and improves the quality of the cast product. Further, the core can be repeatedly used for a plurality of castings, and the core economy can be improved. According to the method of claim 2, in addition to the same effect as that of claim 1, there is no need to align the center line of the core with the moving direction of the mold, the mounting is easy, and the volume setting is limited due to less restriction. Further simplification. According to the apparatus of claim 3, the same effect as the effect of claim 1 can be obtained.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of an apparatus for carrying out an embodiment of the method of the present invention.

FIG. 2 is a partial cross-sectional view of an apparatus for carrying out another embodiment of the method of the present invention.

FIG. 3 is a cross-sectional view of an example of a magnet-type core used in the device according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view of another example of a magnet-type core used in the apparatus according to the embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of a wheel.

[Explanation of symbols]

 11 Cast Product (Wheel) 12 Rim Part 13 Disk Part 14 Thick Part 15 Casting Equipment 16, 17, 18 Mold 20 Magnet Type Core

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Ishida 5-5 Yonbancho, Chiyoda-ku, Tokyo Topy Industries Ltd. (72) Inventor Hisashi Yoshimura 5-5 Yonbancho, Chiyoda-ku, Tokyo 9 Topy Industry Within the corporation

Claims (3)

[Claims] 1. A magnetic core including a magnet is attracted to a portion of a mold corresponding to a required portion for stealing meat of a cast product by utilizing the magnetic force of the magnet, and the mold is closed to fill molten metal into a cavity in the mold. A method for casting a cast product having a meat stealing part, which comprises the steps of pouring a molten metal, solidifying the molten metal, and opening the mold to take out the cast product from the mold. 2. A magnet type core including a magnet is adsorbed to a portion corresponding to a necessary portion for stealing meat of a cast product using the magnetic force of the magnet, and the mold is closed to fill the cavity in the mold with molten metal. After pouring the molten metal and opening the mold, the cast product is taken out from the mold together with the magnet core, and then the magnet core is removed from the cast product. . 3. A mold having a cavity for casting a cast product inside, and a magnet-type core which includes a magnet and is detachably attracted to a cast product stealing required portion of the mold by utilizing the magnetic force of the magnet. A casting device for a cast product having a meat stealing part consisting of.