JPH022579Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to an apparatus for forming a bent pipe made of synthetic resin.

(Prior art) Conventionally, for example, in Japanese Utility Model Publication No. 53-52952,
An apparatus for forming a synthetic resin curved pipe is disclosed. This device consists of an outer mold and a core mold.The core mold is a core part that molds one end of the curved pipe that will be the pipe connection part and the part that continues to this, and a core that molds the remaining part of the curved pipe. It consists of a mold part. During molding, both core mold parts are brought into contact to form a molding core mold, and together with the outer mold, a curved pipe molding mold is formed. After molding, one core part is removed in a linear direction, and the other core part is rotated in an arcuate direction and removed. However, in the above case, if a groove into which the annular elastic body is fitted is formed at one end of the curved pipe that serves as the pipe connection, it is necessary to forcibly remove the core part that forms this part. . However, if the core part is only divided into two parts as described above, when removing the core part from the groove into which the annular elastic body is fitted, the core part must be rotated in an arc direction and removed by force. Therefore, a large amount of force is required to pull out the core part, and unreasonable force is also applied to the bent pipe, which may cause damage to the formed bent pipe.

(Purpose of the invention) The present invention was made in order to eliminate the above-mentioned drawbacks, and it does not apply excessive force to the formed bent pipe when removing the core part after forming. It is an object of the present invention to provide a synthetic resin bent pipe forming device that is free from damage.

(Summary of the invention) The gist of the invention is that it consists of an outer mold and a core mold. a first core mold part that molds a continuous part to the one end of the core mold part;
A second core mold part that molds a part continuous with the part molded by the first core mold part, and can move forward and backward in the axial direction by a moving mechanism installed in the first core mold part. , and a third core mold part for forming the remaining part of the curved pipe, and the second core mold part has a protruding end surface formed on the end surface on the side that comes into contact with the third core mold part. On the other hand, in the apparatus for forming a bent synthetic resin tube, the third core part is formed with a recessed end surface that fits into the protruding end surface.

(Structure of the invention) Next, an example of the synthetic resin bent pipe forming apparatus of the invention will be explained with reference to the drawings.

1 is a bent pipe made of synthetic resin, 2 is an outer mold, and 3 is a core mold. The core type 3 has one end that becomes the pipe connection part of the curved pipe 1,
A first core part 31 that molds a part continuous to the one end of the bent pipe 1, and a second core part 32 that molds a part continuous to the part formed by the first core part 31. and a third core mold part 33 for forming the remaining part of the curved pipe 1.

The first core portion 31 has a groove 11 in which an annular elastic body is fitted into the inner surface of one end of the curved pipe 1 that becomes the pipe connection part.
A projecting edge 5 is formed in the circumferential direction. Further, a moving mechanism for the second core portion 32 is provided within the first core portion 31 . In this moving mechanism, a recessed hole 7 is formed in the center of the first core portion 31, a spring 4 is attached to a shaft 6 provided in the recessed hole 7, and a second spring 4 is attached to the tip of the shaft 6. A core-shaped portion 32 is provided so that it can move forward and backward along the shaft body 6 by compression and restoration of the spring 4.

A protruding end surface 8 is formed on the end surface of the second core part 32 that comes into contact with the third core part 33.
The core portion 33 is formed with a recessed end surface 9 that fits into the protruding end surface 8.

10 is a resin temperature measuring element, 12 is a cartridge heater, 13 is a slide pin insertion hole, and 14 is a slide pin. Reference numeral 15 denotes a medium mold, which is integrated with the first core mold part 31, and when the medium mold 15 is moved along the slide pin 14, the mold of the first core mold part 31 is closed and opened.

(Function) During molding, the third core part 33 is moved close to a predetermined position, the middle mold 15 is moved along the slide pin 14, and the first core part 31 is placed in the restored state of the spring 4. It is moved along the shaft body 6. At this time, the protruding end surface 8 comes into contact with the horizontal surface of the recessed end surface 9 of the third core part 33, and the second core part 3
The lower end of the mold 2 is supported so as not to contact the outer mold 2. Further, when the third core part 33 is completely closed, the protruding end surface 8 of the second core part 32 is completely fitted into the recessed end surface 9 of the third core part 33, and the third core part 33 is completely closed.
The core mold portion 33 is pushed toward the first core mold portion 31 by the compression of the spring 4, and comes into contact with the end face of the first core mold portion 31, completing the mold closing.

After molding, the middle mold 15 is moved along the slide pins 14 in the expanding direction and the first core part 31 is extracted. The flange 5, which has a groove 11 into which the annular elastic body is fitted, formed in the circumferential direction at one end of the bent pipe 1 serving as a pipe connection part, is forcibly extracted from the groove 11. The second core part 32 is removed from the outer mold 2 as the first core part 31 is extracted. Furthermore, the third core portion 33
is pulled out from the outer mold 2 to complete mold opening.

(Effects of the invention) As described above, in the present invention, a protruding end surface is formed on the end surface of the second core part that comes into contact with the third core part, and on the other hand, the third core part Since a recessed end surface is formed to fit with this protruding end surface, the first core portion can be easily removed when molding a curved pipe having a groove in which a sealing annular elastic body is attached to one end. I can do it.

Furthermore, when closing the mold, the protruding end surface of the second core part fits into and is supported by the recessed end face of the third core part, so that the second core part covers the outer surface of the curved pipe. There is no contact with the inner surface of the outer mold to be formed, and damage to the outer mold can be prevented. Furthermore, the first, second and third core sections can all be moved in a substantially straight direction without damaging the formed curved pipe when the core sections are removed.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an example of the synthetic resin bent pipe forming apparatus of the present invention, and FIG. 2 is a longitudinal cross-sectional view taken along the - line of the same. DESCRIPTION OF SYMBOLS 1...Synthetic resin bent pipe, 2...Outer mold, 3...Core mold, 31...First core mold part, 32...Second core mold part, 33...Third core mold part , 5... ridge,
6...Shaft body, 7...Recessed hole.

Claims (1)

[Scope of utility model registration request] It consists of an outer mold and a core mold, and the core mold has a protrusion that forms a groove in the circumferential direction on the inner surface of one end of the curved pipe, and forms a part that is continuous with the one end of the curved pipe. Molding a first core part and a part continuous to the part molded by the first core part,
It is composed of a second core part that can move forward and backward in the axial direction by a moving mechanism installed in the first core part, and a third core part that forms the remaining part of the curved pipe. The second core part has a protruding end surface formed on the end surface that comes into contact with the third core part, and the third core part has a recess that fits with the protruding end surface. A synthetic resin bent pipe forming device with an end face formed.