JP2000280370A - Manufacture of elastomer belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To draw an inner mold from an outer mold while retaining a molding in the outer mold and to release the molding from the outer mold without generating a breakage or a deformation at the molding. SOLUTION: A molding releasing mold plate 3 having an engaging groove 2 recessed at an opening edge of an outer mold 1 is fixed to the mold 1. An inner mold 4 is inserted into the mold 1 through an inner periphery of the plate 3 for releasing a molding, a liquid-like elastomer material 6 is filled in a mold cavity 5 annularly formed between an inner periphery of the mold 1 and the periphery of the plate 3, the outer periphery of the mold 4 and cured. Thereafter, the cured molding 7 is retained in the mold 1, and the mold 4 is drawn from the mold 1. Then, the plate 3 for releasing the molding 7 is taken out of the mold 1 to release the molding 7 held on the inner periphery of the plate 3 by engaging with the groove 2 from the mold 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 producing an elastomer belt formed of an elastomer such as a timing belt and a flat belt.

[0002]

2. Description of the Related Art As a method for producing an elastomer belt, an inner mold 4 is inserted into an outer mold 1 provided with a molding recess 11 as provided in Japanese Patent No. 2,843,547. A liquid elastomer material is filled into a molding cavity 5 formed annularly between the inner periphery of the molding recess 11 and the outer periphery of the inner mold 4, and the cylindrical molding 7 is cured by curing the liquid elastomer material. Molded and this molded product 7
After taking out, there is a method of obtaining an elastomer belt by cutting the molded product 7 as necessary.

Here, there is a method as shown in FIG. 7, for example, for removing the molded article 7 molded into a cylindrical shape as described above. That is, as shown in FIG. 7A, after the molded article 7 is molded in the molding cavity 5 between the outer mold 1 and the inner mold 4, the molded article 7 is placed in the outer mold 1 as shown in FIG. The inner mold 4 is pulled out from the outer mold 1 while leaving. Here, a groove 13 is formed in the inner periphery of the opening edge of the molding recess 11 of the outer die 1, and the upper end of the outer periphery of the molded product 7 is molded and fitted into the groove 12. For this reason, when the inner mold 4 is pulled out from the outer mold 1, the molded article 7 can be left in the outer mold 1 without being removed from the outer mold 1 while being attached to the outer periphery of the inner mold 4. .
Next, as shown in FIG. 7 (c), a jig 12 such as a rod is inserted between the inner periphery of the outer mold 1 and the molded product 7, and the molded product 7 is held down by the jig 12 so as to be shown in FIG. 8 (a), the molded product 7 is bent inward, and the molded product 7 is further bent deeply inward, and the diameter of the molded product 7 is reduced to form the outer mold 1 as shown in FIGS. 7 (e) and 8 (b). After making the inner diameter of the concave portion 11 smaller than the inner diameter of the concave portion 11, the molded product 7 can be pulled out, taken out of the outer die 1, and demolded.

[0004] As a method for removing the molded article 7 formed into a cylindrical shape, for example, there is a method as shown in FIG. 9. That is, in this device, a bottom mold 14 is provided on the lower surface of the outer mold 1 so as to close the opening on the lower surface of the molding recess 11.
After the molded article 7 is molded in the molding cavity 5 between the outer mold 1 and the inner mold 4 as shown in FIG. 9A, the molded article 7 is left in the outer mold 1 as shown in FIG. 4 is pulled out from the outer mold 1. Here, a groove 13 is formed on the inner periphery of the lower edge of the molding recess 11 of the outer mold 1.
Is recessed, and a part of the outer periphery of the molded product 7 is molded and fitted in the groove 13. Therefore, when the inner die 4 is pulled out from the outer die 1, the molded product 7 is The outer mold 4 can be left inside the outer mold 1 without being removed from the outer mold 1 while being attached to the outer periphery of the outer mold 4. Next, as shown in FIG.
4 is removed from the lower surface of the outer mold 1, and the molding recess 1 of the outer mold 1 is formed.
After opening the lower surface of the molded product 7, as shown in FIG.
Can be pulled down, removed from the opening on the lower surface of the molding recess 11, and removed from the mold.

[0005]

However, in the former method shown in FIG. 7, in order to remove the molded product 7 from the outer mold 1, the molded product 7 must be bent. There is a problem that deformation occurs and the production yield of the elastomer belt deteriorates.

In the latter method of FIG. 9, when the inner mold 4 is pulled out from the outer mold 1, the lower end of the molded article 7 fits into the groove 13 and the molded article 7 remains in the outer mold 1. But
If the molded product 7 has a strong force to adhere to the inner mold 4, the inner mold 4
When the is pulled out of the outer mold 1, the molded product 7 is subjected to a tensile force, and the molded product 7 is stretched. As a result, the lower end of the molded product 7 is deformed so as to have a reduced diameter and easily comes out of the groove 13. There is a possibility that the molded article 7 does not remain in the outer mold 1 but remains on the outer periphery of the inner mold 4. When the molded product 7 remains on the outer periphery of the inner mold 4 as described above, it is very difficult to remove the molded product 7 from the outer periphery of the inner mold 4 and remove it. There is a problem that the molded product 7 is distorted or deformed when removed from the outer periphery.

The present invention has been made in view of the above points, and it is possible to remove the inner mold from the outer mold while leaving the molded article in the outer mold, and the molded article is likely to be broken or deformed. It is an object of the present invention to provide a method for producing an elastomer belt which can be removed from an outer mold without using an outer mold.

[0008]

According to the method of manufacturing an elastomer belt of the present invention, a molded product removal mold plate 3 in which a fitting groove 2 is formed in the inner periphery at an opening edge of an outer mold 1 is formed into an outer mold 1. The outer mold 1 is fixed and passed through the inner periphery of the molded product removal mold plate 3.
A liquid elastomer material is inserted into the molding cavity 5 formed in an annular shape between the inner periphery of the outer mold 1 and the inner periphery of the mold plate 3 for taking out a molded product and the outer periphery of the inner mold 4. After filling and curing, the cured molded product 7 is removed from the outer mold 1
By removing the inner mold 4 from the outer mold 1 while leaving it inside, and then removing the molded product removal mold plate 3 from the outer mold 1,
The molded product 7 held on the inner periphery of the molded product take-out template 3 is removed from the outer mold 1 by fitting into the fitting groove 2.

Further, according to the invention of claim 2, after the liquid elastomer material 6 is injected into the outer mold 1, the inner mold 4 is inserted into the outer mold 1 through the inner periphery of the molded product removal mold plate 3. The liquid elastomer material 6 is filled in a molding cavity 5 formed in an annular shape between the inner periphery of the outer mold 1 and the inner periphery of the molded product removal mold plate 3 and the outer periphery of the inner mold 4. It is.

According to a third aspect of the present invention, the inner mold 4 is inserted into the outer mold 1 through the inner periphery of the molded product take-out mold plate 3 to thereby form the inner periphery of the outer mold 1 and the molded product take-out mold plate 3. Molding cavity 5 between the inner periphery of the mold and the outer periphery of the inner mold 4
Is formed, and then a liquid elastomer material is injected and filled into the molding cavity 5.

[0011]

Embodiments of the present invention will be described below.

The outer die 1 is formed in a cylindrical shape with a bottom by providing a molding recess 11 which is opened circularly on the upper surface.
Is set on the molding table 17. When a timing belt is manufactured as an elastomer belt, a large number of axial grooves for molding teeth are provided on the inner periphery of the molding recess 11. The molded product take-out mold plate 3 is formed in a ring shape by providing circular insertion holes 18 opened on both upper and lower surfaces. In the illustrated embodiment, the inner diameter of the insertion hole 18 is set so as to be equal to the inner diameter of the molding recess 11 of the outer die 1. However, the insertion hole 18 only needs to pass through the inner die 4. It may be larger or smaller than the inner diameter of the molding recess 11. The fitting groove 2 is recessed in the inner circumference of the insertion hole 18 over the entire circumference. The fitting groove 2 may be provided with only one, or may be provided with a plurality of grooves.

The inner mold 4 is formed in a cylindrical shape, and the radius of the outer diameter of the inner mold 4 is smaller than the radius of the inner diameter of the molding recess 11 of the outer mold 1 by the thickness of the belt to be manufactured. , So as to be small. The height of the inner mold 4 is the height dimension from the lower surface of the molding recess 11 to the upper surface of the molded product removing template 3 in a state where the molded product removing template 3 is attached to the upper surface of the outer mold 1. It is set to be slightly shorter or almost equal.

[0014] A molded article 7 for obtaining an elastomer belt is molded by using the outer mold 1 and the inner mold 4 described above.
In molding, first, a molded product take-out template 3 is attached and fixed to the upper surface of the outer mold 1 at the opening edge of the molding recess 11. The molded product removal template 3 is attached to the outer die 1 so that the opening on the upper surface of the molding recess 11 and the insertion hole 18 are aligned with each other. The template 3 is fixed. Then, the core wire 21 is wound around the outer periphery of the inner mold 4 in advance, and the liquid elastomer material 6 such as polyurethane is injected into the molding recess 11 of the outer mold 1.

Next, while the inner mold 4 is fixed, the outer mold 1 is raised by the molding stand 17, and the inner mold 4 is inserted into the molding recess 11 of the outer mold 1 through the insertion hole 18 of the molded product removal mold plate 3. Insert. The inner mold 4 is inserted into the molding recess 11 in a state where the axial center of the inner mold 4 and the center of the molding recess 11 are aligned with each other. When the inner mold 4 is inserted into the inside, the molding recess 1 of the outer mold 1 is formed.
The molding cavity 5 is formed as an annular gap between the inner periphery of the inner mold 1 and the inner periphery of the insertion hole 18 of the molded product removal mold plate 3 and the outer periphery of the inner mold 4. When the lower end of the inner mold 4 is inserted until it reaches the bottom of the molding recess 11, the liquid elastomer material 6 injected into the bottom of the molding recess 11 is pushed up by the inner mold 4, and the molding cavity 5 is formed. Are filled with the liquid elastomer material 6 as shown in FIG.
In this state, by closing the opening on the upper surface of the molding cavity 5 with the lid 19 and curing the liquid elastomer material 6 by heating or the like, the cylindrical molded article 7 is molded in the molding cavity 5. Can be done. This molded product 7
The core wire 21 is embedded in the inner periphery of.

After the molded article 7 has been molded in this way, when removing the molded article 7, the lid 19 is first removed, and then the outer mold 1 is lowered by the molding table 17 as shown in FIG. Then, the inner mold 4 is removed from the outer mold 1. At this time, a part of the molded product 7 is molded into the fitting groove 2 provided on the inner periphery of the insertion hole 18 of the product take-out flange 3 fixed to the outer mold 1 and fitted as the fitting protrusion 20. . Accordingly, the molded product 7 can be pulled out from the inner periphery of the molded product 7 without leaving the molded product 7 in the outer die 1 without adhering to the inner die 4 and falling out of the outer die 1. It is. Here, the portion where the fitting protrusion 20 of the molded product 7 is fitted into the fitting groove 2 is the end in the direction in which the inner die 4 is pulled out. Therefore, if the force of adhering to the outer periphery of the inner mold 4 of the molded article 7 is strong, and when the inner mold 4 is pulled out from the outer mold 1, the force for pulling out the molded article 7 from the outer mold 1 together with the inner mold 4 acts strongly. Fitting part 2 of molded product 7
In the place where 0 is fitted in the fitting groove 2, the molded product 7
Is compressed and acts as a force for fitting the fitting projection 20 into the fitting groove 2 deeply. For this reason, the fitting projection 20 does not come off from the fitting groove 2, and as shown in FIG. 3, the inner mold 4 is extracted while the molded product 7 is securely left in the outer mold 1. Can be done.

After the inner mold 4 has been extracted from the outer mold 1 as described above, the molded article take-out template 3 is removed from the outer mold 1 by removing bolts, and the molded article take-out template 3 is removed. Is lifted upward and removed from the outer mold 1, the upper end of the molded product 7 is held by the molded product removal mold plate 3 by the fitting of the fitting projection 20 into the fitting groove 2. As described above, the molded product 7 can be pulled out of the outer mold 1 by being pulled by the molded product removal template 3. Since the molded product 7 can be pulled out of the outer die 1 and pulled out by pulling the molded product removal mold plate 3 in this manner, there is no need to bend the molded product 7 in the outer die 1, and the die is removed. In this case, the molded product 7 is not broken or deformed. This effect is particularly large when the molded product 7 has an inner diameter of 100 mmφ or less.

In a state where the molded article 7 is removed from the outer mold 1,
As shown in FIG. 5, the upper end of the molded product 7 has a product holding flange 3.
The molded product 7 is easily removed from the product holding flange 3 by bending the upper end of the molded product 7 inward and pulling out the fitting projection 20 from the fitting groove 13 as shown in FIG. be able to. Since the upper end of the molded product 7 where the fitting protrusion 20 is provided is a portion cut off as a burr, even if this portion is deformed by bending in this manner, the elastomer belt of the product may be affected. It is not. In addition, if the product holding flange 3 is formed in a split mold, it is not necessary to bend the molded product 7 by disassembling the product holding flange 3 as described above.
The molded product 7 can be removed from the product holding flange 3. The molded article 7 thus obtained can be cut into slices as necessary to obtain an elastomer belt.

In the above embodiment, after the liquid elastomer material 6 is injected into the outer mold 1, the inner mold 4 is inserted into the outer mold 1 through the inner periphery of the molded product removal mold plate 3. The molding is performed by filling the molding cavity 5 with the liquid elastomer material 6.
Is inserted into the outer mold 1 through the inner periphery of the molded product take-out mold plate 3 so as to form a ring between the inner periphery of the outer mold 1 and the inner periphery of the molded product take-out mold plate 3 and the outer periphery of the inner mold 4. The molding cavity 5 may be formed, and then the molding cavity 5 may be filled with a liquid elastomer material 6 by filling.

[0020]

As described above, according to the present invention, a molded product take-out template having a fitting groove formed in the inner periphery at the opening edge of the outer mold is fixed to the outer mold. While inserting the inner mold into the outer mold through the circumference, the liquid elastomer material is filled into the molding cavity formed in an annular shape between the inner circumference of the outer mold and the inner circumference of the mold removal mold plate and the outer circumference of the inner mold. After filling and curing, leave the cured molded product in the outer mold, remove the inner mold from the outer mold, and then remove the molded product removal mold plate from the outer mold to fit into the fitting groove. Since the molded product held on the inner periphery of the molded product removal mold plate is released from the outer mold, the molded product is fitted with the molded product removal flange fitting groove at the end in the direction of extracting the inner mold. When the inner mold is pulled out from the outer mold, Even at work force to withdraw, end moldings are fitted into the fitting groove is compressed in the force,
Acts as a force to fit the molded product deep into the fitting groove, and removes the inner mold with the molded product securely left in the outer mold without the molded product coming out of the fitting groove. Can be done. Also, when removing the molded product removal template from the outer mold, the molded product is held by the molded product removal template by fitting the end into the fitting groove, and the molded product is formed by pulling the molded product removal template. The product can be removed from the outer mold and removed from the mold, and there is no need to bend the molded product in the outer mold to remove the mold. It is possible to remove the mold without using it.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which molding is performed in a molding cavity between an outer die and an inner die according to an example of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state where the inner mold is pulled out from an outer mold.

FIG. 3 is a cross-sectional view showing a state in which a molded product remains in the outer mold according to the first embodiment.

FIG. 4 is a cross-sectional view of a state where a molded product is extracted from the outer mold according to the first embodiment.

FIG. 5 is a cross-sectional view showing a state where the molded product is held by a molded product removal template.

FIG. 6 is a cross-sectional view showing a state in which the molded product is removed from a molded product removal template.

FIGS. 7A to 7E are cross-sectional views each showing an example of the related art. FIGS.

FIG. 8 shows a conventional example of the above, wherein (a),
(B) is a plan view, respectively.

9 shows another example of the related art, and (a) to (d) are cross-sectional views, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer die 2 Fitting groove 3 Mold removal mold plate 4 Inner die 5 Molding cavity 6 Liquid elastomer material 7 Molded product

Continuation of the front page (72) Inventor Haruyuki Tsubaki 4-1-1, Hamazoe-dori, Nagata-ku, Kobe-shi, Hyogo Mitsuboshi Belting Co., Ltd. F-term (reference) 4F202 AA45 AD15 AD18 AG03 AG08 AG16 AG28 AH12 CA01 CB01 CK81 CM11 CN01 4F213 AA45 AD15 AD18 AG03 AG08 AG16 AG28 AH12 WA02 WA53 WA87 WB01 WC01

Claims (3)

[Claims] 1. A molded product removal template having a fitting groove formed in the inner periphery thereof is fixed to an outer mold at an opening edge of the outer mold, and the inner mold is inserted into the outer mold through the inner periphery of the molded product removal template. While inserting the liquid elastomer material into the molding cavity formed in an annular shape between the inner periphery of the outer mold and the inner periphery of the molded product removal mold plate and the outer periphery of the inner mold, and then curing, The hardened molded product is left in the outer die, the inner die is removed from the outer die, and then the molded product removal template is removed from the outer die. A method for producing an elastomer belt, comprising removing a molded product held around the periphery from an outer mold. 2. After the liquid elastomer material is injected into the outer mold, the inner mold is inserted into the outer mold through the inner periphery of the molded article removing mold plate, thereby forming the inner periphery of the outer mold and the molded article removing mold. The method according to claim 1, wherein a liquid elastomer material is filled in a molding cavity formed annularly between an inner periphery of the plate and an outer periphery of the inner mold. 3. Inserting the inner mold into the outer mold through the inner periphery of the molded product take-out mold plate, and thereby, between the inner periphery of the outer mold and the inner periphery of the molded product take-out mold plate and the outer periphery of the inner mold. 2. The method for producing an elastomer belt according to claim 1, wherein after the annular molding cavity is formed, a liquid elastomer material is injected and filled into the molding cavity.