JPH071580A - Receptacle processing mold - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a die for processing a socket having good durability and good maintainability. [Structure] The moving means 20 includes a plurality of link members 21 ...
And a first annular member 22 and a second annular member 23 as moving members which are arranged around the shaft portion 12a so as to be movable along the axial direction, and the first annular member 22 and the second annular member. 23 is moved along the axial direction to form the molding unit 1.
4 mainly includes a first rod 24 and a second rod 25 as expansion / contraction diameter actuating members for performing expansion / contraction diameter 4. Then, one end 21a of the link member 21 is rotatably attached to each of the outer and inner divided pieces 13a, 13b, and the other end 21b is rotatably attached to the first and second annular members 22, 23. By the operation of the first and second rods 24 and 25 in the front-rear direction along the axial direction, the outer and inner divided pieces 13a and 13b are respectively simultaneously passed through the link member 21 in the radial direction with each one end 15 as a center. It is configured to be rotated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used when secondary processing is performed by thermally deforming the end portion of a pipe made of a thermoplastic resin material such as a vinyl chloride pipe mainly used for water supply and drainage of buildings. The present invention relates to a socket processing die used.

[0002]

2. Description of the Related Art As a conventional receiving die 1 of this type, as shown in FIG. 4, a plurality of circumferentially divided pieces 2 are arranged around a die body 1a. It is known that the cylindrical forming part 3 is configured. In such a structure, the pyramidal bases 4 are slidably contacted with the respective divided pieces 2 from the inside, and the divided pieces 2 are moved in the radial direction to expand and reduce the diameter of the molding portion 3. (Japanese Patent Application Laid-Open No. Sho 55
-73513, JP-B-61-2023, etc.).

Then, the end 5a of the PVC pipe 5 is heated and inserted from the right side in the drawing, so that the molding portion 3 is expanded and the end 5a of the PVC pipe 5 is opened from the inside.
Is pressed, and the groove portion 5b for the rubber ring used for connecting the vinyl chloride pipes 5 is secondarily formed.

After cooling and hardening, when the pyramidal pedestals 4 are slid to the left in the figure, the respective divided pieces 2 move in the radial direction toward the center to bring the molding portion 3 into a reduced diameter state. . Since the molding portion 3 is separated from the inside of the end portion 5a, the PVC pipe 5 can be pulled out rightward in the drawing.

[0005]

However, in such a conventional socket processing die 1, the sliding contact surfaces 2a, 4a between the pyramid base 4 and the divided pieces 2 and the pyramid base 4 and the metal are provided. Sliding contact surfaces 1b, 4b and the like with the die main body 1a make sliding contact each time the pyramid base 4 slides. For this reason, it is difficult to say that the sliding parts such as the sliding contact surfaces 2a ... Are heavily worn and the durability is good.

Further, in order to reduce the friction of each of the sliding contact surfaces 2a, lubricating oil or the like is used. However, since the contact area is large, this lubrication management is not easy and there is a problem in maintainability.

[0007] Therefore, the present invention provides a socket working die having good durability and good maintainability.

[0008]

In order to solve the above problems, according to the present invention, there is provided a mold main body, and a molding portion capable of expanding and reducing the diameter, which comprises a plurality of divided pieces circumferentially attached to the mold main body. , A moving means for moving each of the divided pieces to expand and reduce the diameter of the molded part, and expand the molded part to press it from the inner surface side of the heated pipe formed of a thermoplastic resin material. ,
In a die for processing a socket that secondary-processes the shape of the end portion and can be drawn out in a reduced diameter state, the split piece has one end portion along the pipe axial direction that rotates in the radial direction with respect to the die main body. The moving means includes a link member movably attached to the other end of the split piece, and a moving member rotatably attached to the other end of the link member. Move the member along the axial direction,
It is characterized by a socket processing die having an expansion / contraction diameter actuating member for expanding / contracting the molding portion.

[0009]

[Operation] According to this structure, the expansion / contraction diameter actuating member is moved along the axial direction, and the other end of the split piece is moved by the link member. The split pieces respectively rotate around the one end in the radial direction with respect to the mold body to expand and reduce the diameter of the molding portion.

At this time, since the split piece is rotatably attached to one end of the link member, and the other end of the link member is rotatably attached to the moving member. By moving the expansion / contraction diameter actuating member, the divided piece can be smoothly rotated to expand and reduce the diameter of the molding portion. For this reason, there are few worn parts and good durability, and since there are few contacting parts, lubrication management is easy and maintainability is good.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the present invention.

First, the structure will be described.
A die for processing a socket that secondary-processes the shape of an end portion of a thermoplastic resin such as a PVC pipe. The mold 11 for a socket is mainly attached to the mold main body 12 and the mold main body 12, It has a molding part 14 which can be expanded and reduced in diameter and is composed of outer divided pieces 13a ... And inner divided pieces 13b, and a moving means 20 which expands and reduces the diameter of the molding part 14 by moving each divided piece 13. There is.

Then, the socket processing die 11 is inserted into a heated vinyl chloride pipe formed of a thermoplastic resin material, the molding portion 14 is expanded and pressed from the inner surface side of the vinyl chloride pipe, Secondary processing of the shape of the end of the PVC pipe. After cooling, the molded portion 14 is reduced in diameter so that the PVC pipe can be pulled out.

The respective divided pieces 13a and 13b are alternately and adjacently arranged around the shaft portion 12a arranged along the pipe axial direction at the central portion of the mold body 12 and arranged in the pipe axial direction. .. are attached to the mold body 12 so as to be rotatable in the radial direction. When both side ends 26, 26 of the inner divided piece 13b come into contact with the inner side edges 27, 27 of the adjacent outer divided pieces 13a and stop, the outer peripheral surface of the adjacent outer divided piece 13b and this inner divided piece 13b. It is configured to have the same height as the outer peripheral surface of the piece 13b. An annular projection 13c is formed on the outer peripheral surface of each of the divided pieces 13a and 13b, the groove forming a groove for arranging the connecting rubber ring inside the PVC pipe.

The moving means 20 comprises a plurality of link members 2
1, a first annular member 22 and a second annular member 23 as moving members which are arranged around the shaft portion 12a so as to be movable in the axial direction, and the first annular member 22 and the first annular member 22. 2 by moving the annular member 23 along the axial direction,
It mainly has a first rod 24 and a second rod 25 as expansion / contraction diameter actuating members for expanding / contracting the molding portion 14.

Then, the one end portion 21 of the link member 21.
a is rotatably attached to each of the outer divided pieces 13a, and the other end 21b is rotatably attached to the first annular member 22, and the first rod 24 is actuated in the front-rear direction along the axial direction. Thus, the outer divided pieces 13a are simultaneously rotated in the radial direction around the one end 15 through the link member 21.

Further, one end portion 21a of the link member 21.
Is rotatably attached to each of the inner divided pieces 13b, and the other end 21b is rotatably attached to the second annular member 23. Then, by operating the second rod 25 in the front-rear direction along the axial direction, the inner divided pieces 13b are simultaneously rotated in the radial direction around the one end 15 through the link member 21. It is configured.

Next, the operation of the first embodiment will be described.

According to this structure, in order to bring the expanded state, first, the first rod 24 is axially moved along the die body 1.
(2) The tip end portion 11a is moved and the other end portion of the outer divided piece 13a is pushed up by the link member 21. The outer divided pieces 13a ... Rotate in the radial direction with respect to the mold body 12 around the one end portion 15 to expand a part of the molding portion 14.

Next, the second rod 25 is moved in the axial direction toward the tip portion 11a of the mold body 12 to move the link member 2.
1 ... pushes up the other end of the inner divided pieces 13b. The inner divided pieces 13b ... Rotate in the radial direction with respect to the mold body 12 around the one end portion 15 to expand the other portion of the molding portion 14.

At this time, the divided pieces 13a and 13b are rotatably attached to one end 21a of the link member 21, and the other end 21b is rotatably attached to the first and second annular members. Therefore, the divided pieces 13a, 13b can be smoothly rotated around the one end portion 15 ... As a center, and the molding portion 14 can be expanded and reduced in diameter. For this reason, there are few worn parts and good durability, and since there are few contacting parts, lubrication management is easy,
Good maintainability.

The both side ends 26, 26 of the inner divided piece 13b come into contact with the inner side edges 27, 27 of the adjacent outer divided pieces 13a and stop. At this time, since the outer peripheral surface of the adjacent outer divided piece 13b and the outer peripheral surface of the inner divided piece 13b are at the same height, the respective divided pieces 13a and 13b.
There is almost no gap or step between them.

Then, by heating and inserting the end of the PVC pipe (not shown) from the direction of the tip 11a,
The annular projection 13c of the molding portion 14 presses the end portion of the vinyl chloride pipe from the inside in the expanded state to secondarily mold the groove portion for the rubber ring used for connecting the vinyl chloride pipes to each other. At this time, since there are almost no gaps or steps in the molding portion 14, a secondary molded product having a desired shape can be obtained.

After cooling and hardening, the second rod 25 and the first rod 25
Example 1 The rod 24 is sequentially pulled out along the axial direction, and the second annular member 23 and the first annular member 22 are connected to the tip portion 11.
When it is moved in a direction away from a, the inner divided piece 13
After the rotation of b in the radial direction, the outer divided piece 13a also moves toward the center in the radial direction. Therefore, the molded portion 14 is in a reduced diameter state. Therefore, since the outer peripheral surface of the molded portion 14 is separated from the inside of the PVC pipe, it can be pulled out without deforming the PVC pipe.

FIG. 3 shows a socket processing die 30 according to the second embodiment of the present invention. The same or equivalent portions as those in the first embodiment will be described with the same reference numerals.

In the socket processing die 30 of the second embodiment, the other end 33d of each of the outer and inner divided pieces 33a and 33b.
In addition, the molded piece 34 is brought into a desired substantially cylindrical shape by abutting the divided piece opening peripheral edge portion 12b of the mold body 12 from the inside so that the divided pieces 33a and 33b are in an expanded state, and each of the adjacent molded pieces 34 is adjacent to each other. An abutting portion 33e is formed to stop so as to minimize the gap between the split pieces 33a and 33b.

Further, the link member 31 is formed with an elastic portion 31c whose cross section is set smaller than the other portions. Then, in the expanded state, the same annular member 22 or 23
In the case where the contact portion 33e of one of the plurality of divided pieces 33a ... or 33b, which is rotatably arranged via the link member 31, does not abut, The link member 31 connected to the other split piece 33a ... Or 33b ... Is elastically deformed by the elastic portion 31c, and the contact portion 33e of the one split piece 33a or 33b.
Are configured to abut. The rest of the configuration is substantially the same as that of the first embodiment, so the description is omitted.

In the second embodiment thus constructed, in addition to the operation described in the first embodiment, the contact portion 33e is further extended from the inside to the opening peripheral edge portion 12b for the split piece in the expanded state. The divided pieces 33a and 33b abut each other to form the molding portion 34 into a desired substantially cylindrical shape and the adjacent divided pieces 33.
Stop so as to minimize the gap between a and 33b. Therefore, by improving the dimensional accuracy of the contact portion 33e and the split piece opening peripheral edge portion 12b, it is possible to obtain an accurate shape and size of the molding portion 34. For example, the link member 2
It is not necessary to obtain strict dimensional accuracy in the portion that rotatably supports 1. Therefore, the manufacturing is easy, and the adjustment is completed only by adjusting the contact portion between the contact portion 33e and the split piece opening peripheral edge portion 12b, and the maintainability is further improved.

The link member 31 has an elastic portion 31c.
Therefore, when even one contact portion 33e does not contact the divided piece opening peripheral edge portion 12b, this elastic portion 31c of the other link member 31 causes the first and second rods 24 to move. , 25 are elastically deformed to bring all the contact portions 33e into contact with the divided piece opening peripheral edge portion 12b.

Therefore, a more accurate shape and size of the molding portion 34 can be obtained.

[0032]

As described above, according to the present invention, the divided piece is attached to one end of the link member so as to be rotatable, and the other end of the link member rotates with the moving member. Since it is attached so as to be movable, it is possible to smoothly rotate the split piece by the movement of the expansion / contraction diameter actuating member to expand and reduce the diameter of the molding portion. For this reason, there are few worn parts and good durability, and since there are few contacting parts, lubrication management is easy,
It has a practically useful effect of good maintainability.

[Brief description of drawings]

FIG. 1 shows a die for processing a socket according to a first embodiment of the present invention,
It is a partial cross-sectional view of the socket processing die as viewed from the side.

FIG. 2 shows a die for processing a socket according to the same embodiment, and FIG.
It is a sectional view taken along the line A.

FIG. 3 is a partial cross-sectional view showing a socket processing die of a second embodiment, as viewed from the side.

FIG. 4 is a cross-sectional view showing a conventional die for processing a socket, which is viewed from the side.

[Explanation of symbols]

 11, 30 Receptacle processing die 12 Mold body 13a, 13b Outer and inner divided pieces (divided pieces) 14 Forming part 15 One end 20 Moving means 21, 31 Link member 22, 23 First and second annular member (moving member) ) 24, 25 First and second rods (expansion / contraction diameter actuating members)

Claims (1)

[Claims] Claims: 1. A mold main body, and a molding section comprising a plurality of divided pieces circumferentially attached to the mold main body, which can be expanded and reduced in diameter, and each of the divided pieces are moved to expand and contract the molding section. A moving means for making the diameter of the pipe, expand the molding portion, and press from the inner surface side of a heated pipe formed of a thermoplastic resin material,
In a receiving die for secondary processing of the shape of the end portion, which can be drawn out in a reduced diameter state, the split piece is such that one end portion along the pipe axial direction rotates in a radial direction with respect to the die main body. The moving means includes a link member movably attached to the other end of the split piece, and a moving member rotatably attached to the other end of the link member. An expanding / reducing diameter actuating member which expands / reduces the diameter of the molding portion by moving the member along the axial direction.