JPH09122826A - Method for molding wax pattern having hollow structure and metal mold used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to integrally manufacture a wax pattern having a hollow part of a brake disk, etc. SOLUTION: A member 5 for forming the hollow part is disposed in the position corresponding to the hollow part of the first wax pattern in the method for molding the wax pattern of the hollow structure by using the metal molds 1 consisting of an upper mold 2 and a lower mold 3. This member 5 for forming the hollow part is removed after curing of the wax, by which the desired hollow part is formed in the wax pattern before the wax pattern 1 is taken out of the metal molds 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a wax model having a hollow structure and a mold used for the method. More specifically, the present invention relates to a method for forming a wax model having a hollow structure capable of integrally producing a wax model having a hollow structure, and a mold used for the method.

[0002]

2. Description of the Related Art Conventionally, a disc brake device has been used as a brake device in an automobile. In order to prevent overheating of the brake disc a during operation of the brake device, the brake disc a used in this disc brake device is provided with cooling air passages b in an oblique radial pattern as shown in FIG. It is designed to be air-cooled by the air passing there.

Therefore, when the brake disc a having such a shape is produced by precision casting by the lost wax method, a wax model having the same shape as the brake disc a is required. Conventionally, such a wax model is produced by providing ribs e and f for forming a cooling air flow path b on an upper plate c and a lower plate d as shown in FIG. It is made by adhering the plate d. Alternatively, as shown in FIG. 11, ribs f for forming the cooling air flow path b are provided only on the lower plate d, and then the lower plate d is formed.
It is made by bonding the upper plate c to.

However, in the method shown in FIG. 10 and FIG. 11, a large number of ribs e and f must be adhered with high precision, so that the work is complicated and the productivity is low.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and a method for forming a wax model having a hollow structure capable of easily producing a wax model having a hollow portion such as a brake disk and a method therefor. The purpose is to provide a mold to be used.

[0006]

A method for forming a wax model having a hollow structure according to the present invention is a method for forming a wax model having a hollow structure, which uses a mold composed of an upper mold and a lower mold. By the time it is taken out, the desired hollow part is formed in the wax model.

More specifically, in the method for forming a hollow structure wax model of the present invention, a hollow part forming member is disposed at a position corresponding to the hollow part of the wax model of the mold, and the hollow part forming member is formed. The member is removed from the wax model after the wax has hardened.

Here, the removal of the wax of the hollow-portion forming member from the wax model after hardening is performed, for example, by making the hollow-portion forming member soluble, and after the wax is hardened, the hollow-portion forming member is wax model. Is removed from the wax model by dissolving or removing it from the wax model, or by allowing the hollow-portion forming member to move back and forth, and after the wax is cured, the hollow-portion forming member is retracted and removed from the wax model.

On the other hand, the hollow structure wax model molding die of the present invention is a hollow structure wax model molding die using a mold comprising an upper mold and a lower mold. It is characterized in that a hollow portion forming means for forming a hollow portion is attached to the wax model.

Here, the hollow portion forming means is, for example,
It is a hollow part forming member that can be moved back and forth in a wax model forming space mounted on a lower mold.

In the hollow structure wax model molding die of the present invention, it is preferable that the wax model discharging means is mounted.

Here, the wax model discharging means is, for example, a wax model discharging member which can advance and retreat from below into a wax model forming space mounted in a lower mold.

In the present invention, instead of forming a hollow portion in the wax model, a member integrated with the cast product is previously arranged at a position corresponding to the hollow portion of the wax model of the mold. May be molded.

[0014]

In the present invention, the desired hollow portion is formed in the wax model when the wax model is discharged from the mold, so that the productivity is improved.

Further, instead of forming a hollow part in the wax model, a position corresponding to the hollow part of the wax model of the mold is provided.
In the case where a member integrated with the cast product is previously arranged, a material different from the cast material such as ceramic can be integrated with the cast product.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments with reference to the accompanying drawings, but the present invention is not limited to only such embodiments.

Embodiment 1 FIG. 1 shows an upper mold and a lower mold for a hollow structure wax model molding die (hereinafter, simply referred to as a mold) of the first embodiment used in the hollow structure wax model molding method of the present invention. Is separated and shown in a sectional view. The mold 1 is a disc-shaped upper mold 2 as shown in FIG.
And the disk-shaped lower mold 3 are the main parts. The lower die 3 is formed with a ring-shaped groove 4 which forms a cavity C in cooperation with the upper die 2, and a core (a hollow portion forming member) which advances and retreats into the cavity C on the outer side thereof. ) 5 are mounted in a large number of grooves 6, 6, 6, ... At regular intervals and in a radial pattern. The shape of the groove 6 is adjusted so that the core 5 attached to the groove 6 is automatically locked when the core 5 enters the cavity C by a predetermined amount. For example, when the core 5 is a tapered prism, the shape of the groove 6 corresponds to the shape of the core 5 existing in the groove 6 when the core 5 enters the cavity C by a predetermined amount. It is said that. In FIG. 1, reference numeral 7
Indicates a wax inlet.

Next, a procedure for producing a wax model having a hollow structure by using the mold 1 having the above structure will be described.

(1) After placing the upper die 2 on the lower die 3, the upper die 2 and the lower die 3 are integrated.

(2) Insert the core 5 into the cavity C.

(3) The wax in a fluid state is injected into the cavity C through the injection port 7.

(4) After the wax is hardened, the core 5 is withdrawn from the cavity C.

(5) After separating the upper mold 2 and the lower mold 3, the wax model is taken out from the lower mold 3.

Thereafter, a desired product is cast by a conventional method using this wax model.

As described above, according to the first embodiment,
A wax model having a desired hollow structure can be obtained by a simple procedure.

Embodiment 2 A mold of Embodiment 2 used in the method for forming a wax model having a hollow structure of the present invention is shown in FIG. 3 in a sectional view in which an upper mold and a lower mold are separated, and this mold 1A is As shown in the figure, a disk-shaped upper mold 2
A and the disk-shaped lower mold 3A are the main parts. The lower mold 3A is formed with a stepped ring-shaped groove 8 that forms a cavity C in cooperation with the upper mold 2A. On a step portion 8a of the stepped groove 8, a core 5A having a desired shape (hereinafter referred to as a solve core) made of a solve wax is mounted. The lower surface of the upper mold 2A (the surface facing the lower mold) 2
As shown in FIG. 4, a pressing member 2 for pressing both ends of the core 5A is provided at positions corresponding to both ends of the core 5A.
2 is projected in the shape of a double-ring. This holding member 2
The inner dimension between 2 and 22 is matched with the width of the lower groove of the stepped groove 8 of the lower mold 3A. With this structure, when the upper mold 2A and the lower mold 3A are integrated, the cavity C is formed by the cooperation of the pressing member 22 and the stepped groove 8.
Is formed.

Next, a procedure for producing a wax model having a hollow structure by using the mold 1A having the above structure will be described.

(1) A solver core 5A having a desired shape is mounted on the step portion 8a of the stepped groove 8. For example, a solver core 5 in which concave lines are formed in a desired arrangement in order to form a convex line on a mold
A is mounted on the step portion 8a of the stepped groove 8.

(2) After placing the upper mold 2A on the lower mold 3A,
The upper mold 2A and the lower mold 3A are integrated.

(3) A fluid wax is injected into the cavity C through the injection port 7.

(4) After the wax is hardened, the soluble core 5A is eluted with a dissolving agent. For example, A7-2401 PATT manufactured by Brayson as a soluble wax
When ERNWAX is used, hydrochloric acid or water is used as the dissolving agent.

(5) After separating the upper mold 2A and the lower mold 3A, the wax model is taken out from the lower mold 3A.

Thereafter, a desired product is cast by a conventional method using this wax model.

As described above, according to the second embodiment,
Similar to the first embodiment, a desired hollow model wax model is obtained by a simple procedure.

Embodiment 3 FIG. 5 shows Embodiment 3 used in the hollow structure wax model forming method of the present invention, and Embodiment 3 is Embodiment 2.
In this embodiment, a ceramic core 5B is used in place of the soliable core 5A.

Next, a procedure for producing a wax model using the mold 1A having the above structure will be described.

(1) The ceramic core 5B having a desired shape is mounted on the step portion 8a of the stepped groove 8. For example, in order to form a convex stripe on the mold, the ceramic core 5B having concave stripes formed in a desired arrangement is mounted on the step portion 8a of the stepped groove 8.

(2) After placing the upper mold 2A on the lower mold 3A,
The upper mold 2A and the lower mold 3A are integrated.

(3) The wax in a fluid state is injected into the cavity C through the injection port 7.

(4) After the wax is hardened, the wax model is taken out from the lower mold 3A.

Thereafter, a desired product is cast by a conventional method using this wax model. In this case, the ceramic core 5
B is integrated into the product as a ceramic member.

Thus, according to the third embodiment,
A wax model having a desired hollow structure can be obtained by the same simple procedure as in Embodiments 1 and 2, and a cast product in which the ceramic member used for the core is integrated is obtained. That is, it is possible to form a cast product by integrating materials having different properties from the cast material.

[0043]

EXAMPLES The present invention will now be described in more detail based on examples in which the above-described embodiment is more specific.

Example 1 The mold 1B of this Example 1 is a concrete example of the first embodiment, and when the core 5 is integrated with the lower mold 3B and the upper mold 2B, the lower mold upper surface is obtained. 31 is moved forward and backward by the advancing and retracting mechanism D to move the core 5C into and out of the cavity C formed by the grooves 4 and 23 formed in the lower die 3B and the upper die lower surface 21, respectively. It is designed to be discharged.

Specifically, in the first embodiment, as shown in FIG. 6, the outer peripheral portion of the lower die upper surface 31 has a two-stepped shape, and the cavity C is formed at an appropriate position of the upper step 32. Groove 4 is provided. On the other hand, a groove 23 is also provided on the lower surface 21 of the upper mold at a position corresponding to the groove 4, and these grooves 4, 23 cooperate with each other when the upper mold 2B and the lower mold 3B are integrated. Configure tee C. Also, the lower mold 3B
The lower stage 33 is provided with a slide long hole 34 for restricting the moving direction of the core 5C.

Core 5C moving forward and backward in this cavity C
The core body 51 has a thickness that allows a gap formed between the upper die lower surface 21 and the lower die 3B upper step 32 to slide when the upper die 2B and the lower die 3B are integrated. There is. A core base 52 is integrally formed from the rear end of the core body 51. The core base 52 includes a slide surface 52a that slides on the lower stage 33 of the lower mold 3B and a lower stage 33.
To the upper surface 32 and the contact surface 52b to the rising surface 35. Here, the length of the core body 51 is set to a length that slightly protrudes from the inner end of the groove 4 in a state where the contact surface 52b contacts the rising surface 35.

Further, at a proper position on the slide surface 52a, the pin 52 inserted into the slide long hole 34 is inserted.
c is provided. The tip portion of the pin 52c projects from the slide long hole 34 and is fitted into the drive long hole 11a provided in the rotary cam 11 rotatably mounted on the lower die lower surface 36. The drive elongated hole 11a is an arc-shaped elongated hole 11a oriented in a predetermined direction so that the pin 52c inserted and fitted can be driven as the rotary cam 11 rotates as shown in FIG.

With this structure, when the rotary cam 11 is rotated in the direction of the arrow, the pin 52c is rotated.
Is driven to the outside of the slide long hole 34, and the core body 51 is withdrawn from the cavity C accordingly. In addition,
In the illustrated example, the elongated slide holes 34 are provided in the radial direction, but the core main body 51 can be moved back and forth in a desired direction by appropriately adjusting the direction of the elongated slide holes 34. That is, a hollow part can be formed in the wax model in a desired direction.

In this lower mold 3B, as shown in FIG. 6, through holes 37 reaching the bottom surface of the groove 4 from the lower surface 36 are formed at appropriate positions (two through holes 37, 37 in the figure). It is shown). Into the through hole 37, a discharging pin 13 is mounted which is mounted on the lifting member 12 which is mounted on the base B so as to be lifted up and down, and through which the hardened wax model is projected from the groove 4 and discharged. . The length of the tip of the discharging pin 13 is adjusted so as to be flush with the bottom surface of the groove 4.

Next, the procedure for producing a wax model having a hollow structure by using the mold 1B having the above structure will be described.

(1) After placing the upper mold 2A on the lower mold 3A,
The upper mold 2A and the lower mold 3A are integrated.

(2) The rotary cam 11 is rotated in a predetermined direction so that the core main body 51 enters the cavity C.

(3) A fluid wax is injected into the cavity C through the injection port 7.

(4) After the wax is hardened, the rotating cam 1
1 is rotated in the opposite direction to the above, and the core body 51 is withdrawn from the inside of the cavity C.

(5) After the upper die 2A and the lower die 3A are separated, the elevating member 12 is raised and the ejection pin 13 is pushed up to eject the wax model by projecting it from the groove 4.

As described above, according to the first embodiment, it is possible to easily advance and retract the core and take out the wax model from the lower mold.

Example 2 The mold 1C of this Example 2 is a modification of Example 1 in which the core 5 is manually moved into and out of the cavity C.

Specifically, in the second embodiment, as in the first embodiment, the outer peripheral portion of the lower die upper surface 31 has a two-step staircase shape,
A groove 4 for forming the cavity C is provided at an appropriate position on the upper stage 32 (see FIG. 8). On the other hand, the outer peripheral portion of the lower surface 21 of the upper die is also provided with a step portion 24 corresponding to the lower step 33 of the lower die 3C in a reverse step shape. Also, the lower surface 21 of the upper mold
A groove 23 is also provided at a position corresponding to the groove 4 provided in the upper stage 32 of the lower die 3C, and these grooves 4 and 23 cooperate when the upper die 2C and the lower die 3C are integrated. To form the cavity C.

Core 5D moving back and forth in this cavity C
Consists of a core body 51 that moves forward and backward in the cavity C, and a core gripping portion 53 that is integrally formed from the rear end of the core body 51. The grip portion 53 has a thickness capable of sliding a gap formed between the upper die lower surface 21 and the lower die 3C upper step 32 when the upper die 2C and the lower die 3C are integrated. In addition, the core gripping portion 53 is such that the core body 51 has a cavity C.
The size is such that the rear end portion thereof projects a predetermined amount into the space formed by the lower stage 33 of the lower die 3C and the stepped portion 24 of the upper die 2C in the state of entering the inside.

Since the rest of the configuration is the same as that of the first embodiment, the same reference numerals as those in FIG. 6 are given to FIG. 8 and the detailed description thereof is omitted.

Next, a procedure for producing a wax model having a hollow structure by using the mold 1C having the above structure will be described.

(1) After placing the upper mold 2C on the lower mold 3C,
The upper mold 2C and the lower mold 3C are integrated.

(2) Core 5D by gripping the core gripping portion 53
Is pushed toward the center of the mold to insert the core body 51 into the cavity C.

(3) The wax in a fluid state is injected into the cavity C through the injection port 7.

(4) After the wax is hardened, the core gripping portion 53 is again gripped and pulled out, and the core body 51 is withdrawn from the cavity C.

(5) After the upper mold 2C and the lower mold 3C are separated, the projecting member 12 is raised and the discharging pin 13 is pushed up to project the wax model from the groove 4 and discharge it.

As described above, according to the second embodiment, it is possible to easily move the core back and forth and take out the wax model from the lower mold as in the first embodiment.

[0068]

As described in detail above, according to the present invention,
Since the desired hollow portion is formed in the wax model when the wax model is discharged from the mold, the excellent effect that the productivity of the cast product production by the lost wax method is remarkably improved is obtained.

In a preferred embodiment of the present invention, instead of forming a hollow portion in the wax model, a member integrated with the casting is provided in the wax model at a position corresponding to the hollow portion of the wax model. Since they are arranged in advance, a material different from the cast material such as ceramics can be integrated into the cast product, and an excellent effect that a cast product having characteristics that cannot be obtained by an ordinary casting method is produced is obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an upper die and a lower die of a mold of a first embodiment used in a hollow structure wax model forming method of the present invention.

FIG. 2 is a plan view of a lower mold of the mold.

FIG. 3 is a cross-sectional view showing an upper die and a lower die of the mold of the second embodiment used in the hollow structure wax model forming method of the present invention.

FIG. 4 is a rear view of the upper mold of the mold.

FIG. 5 is a cross-sectional view showing an upper die and a lower die of the mold of the third embodiment used in the hollow structure wax model forming method of the present invention.

FIG. 6 is a cross-sectional view of a main part of the mold according to the first embodiment of the present invention.

FIG. 7 is an exploded perspective view of the advancing / retreating mechanism used in the first embodiment.

FIG. 8 is a sectional view of a main part of a mold according to a second embodiment of the present invention.

FIG. 9 is a plan view of a brake disc.

FIG. 10 is an explanatory diagram showing an example of a conventional method for producing a wax model having a hollow structure.

FIG. 11 is an explanatory view of another example of a conventional method for producing a wax model having a hollow structure.

[Explanation of symbols]

 1 Mold 2 Upper mold 3 Lower mold 4, 6 Groove 5 Core (hollow part forming member) 7 Injection port 8 Stepped groove 11 Rotating cam 12 Elevating member 13 Ejection pin B Base C Cavity D Advance mechanism E Ejection mechanism

Claims (9)

[Claims] 1. A method for forming a wax model having a hollow structure using a mold including an upper mold and a lower mold, wherein a desired hollow part is formed in the wax model by the time the wax model is taken out of the mold. A method for forming a wax model having a hollow structure, which is characterized in that 2. A hollow part forming member is disposed at a position corresponding to the hollow part of the wax model of the mold, and the hollow part forming member is removed from the wax model after the wax is hardened. The method for molding a wax model having a hollow structure according to claim 1. 3. The hollow portion forming member is made soluble,
3. The method of molding a wax model having a hollow structure according to claim 2, wherein the hollow part forming member is dissolved and removed from the wax model after the wax is hardened. 4. The wax model molding having a hollow structure according to claim 2, wherein the hollow-portion forming member is movable back and forth, and the hollow-portion forming member is retracted and removed from the wax model after the wax is hardened. Law. 5. A method for forming a wax model having a hollow structure, characterized in that, instead of forming a hollow portion in the wax model, a member integrated with a cast product is provided in advance. 6. A wax model molding die having a hollow structure using a mold comprising an upper mold and a lower mold, wherein a hollow part forming means for molding a hollow part in the wax model is attached to the upper mold or the lower mold. A mold for forming a wax model having a hollow structure, which is characterized in that 7. The wax having a hollow structure according to claim 6, wherein the hollow portion forming means is a hollow portion forming member that is movable back and forth in a wax model forming space attached to a lower mold. Mold for model molding. 8. The hollow model wax model molding die according to claim 6, further comprising a wax model discharging means. 9. The hollow structure according to claim 8, wherein the wax model discharging means is a wax model discharging member which can be advanced and retracted from below into a wax model molding space attached to a lower mold. Mold for wax model molding.