JPS5843260B2 - Kantsugi tenoseiyou kanagata - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding die used for molding a pipe joint with an undercut portion.

Conventionally, due to mechanical strength and internal resin flow issues during molding, pipe joints have been used that have an undercut portion with an arcuate inner surface.

Prior application (patent application 1972-12) as a mold for forming pipe joints.
No. 3063 (Japanese Unexamined Patent Publication No. 51-47953) discloses a mold for forming a pipe joint in which a main pipe is opened at both ends and a branch pipe is formed from the center of the main pipe. two slide cores having outer surfaces matching the inner shape and capable of being inserted into and extracted from the outer mold from opposite directions;
There is a mold for forming a pipe joint that includes a slide core that has an outer surface that matches the inner shape of the branch pipe and can be inserted into and extracted from the outer mold 2.

The molding of the undercut part in the molding die is as follows:
A member that moves later than the retreat of the slide core is inserted into the slide core that forms one end of the main pipe, a nest is provided at the tip, and an undercut is formed by the mold surface formed by the nest. It was something to do.

In some molding molds, when the insert is retracted from a state where it protrudes from the mold surface, it may catch on the corner of the recess that accommodates the insert and be fixed in a predetermined position. There was a risk that it would not be possible.

If the angle of view of the insert gets caught in the corner of the recess and becomes immovable, the desired mold cavity may not be obtained due to mold clamping.

In view of the above, it is an object of the present invention to provide a mold for forming a pipe joint that can form a desired mold cavity by mold clamping and that can easily remove the undercut portion from the molded product after molding. purpose.

The gist of the present invention is to provide a main pipe 11 with both ends opened, and a main pipe 1
This is a mold for forming a pipe joint in which a branch pipe 14 is formed from the center of the main pipe 1, and has an outer surface that matches the inner shape of the main pipe 11, and can be inserted into and extracted from the outer mold 2 from opposite directions. Two slide cores 3 and 4 that can come out freely and a branch pipe 14
In a mold for forming a pipe joint, the slide core 5 has an outer surface that matches the inner shape of the outer mold 2 and can be freely inserted into and extracted from the outer mold 2. A concave surface 31 abutting the front end is formed,
A protrusion 32 is formed in the middle of the concave surface 31, a concave surface 41 that can come into contact with the tip of the insert 6 is formed at the front end of the slide core 4, and the slide core 3 is formed at the front end of the slide core 5. , 4 is provided, and the convex surface 51 is provided with a concave portion 52 and a guiding groove 53 for the protrusion 32 of the slide core 3.
An insert 6 is provided in the slide core 4, and the insert 6 is connected to the slide core 4.
It has a convex surface that can come into contact with the concave surface 41 of the main pipe 11 and the branch pipe part 14, and has an outer surface that matches the inner shape of the undercut part 13 which is curved in an arc shape at the connection part between the main pipe 11 and the branch pipe part 14, A stepped portion 61 is provided to regulate the position so that a mold cavity corresponding to the undercut portion 13 can be formed when the mold is closed, and the insert 6 can be rotated within the recessed portion 52 by a pin 7. A mold for forming a pipe joint, characterized in that the mold is attached to a pipe fitting.

Next, an example of a mold for forming the pipe joint of the present invention will be explained with reference to the drawings.

In FIGS. 1 to 5, reference numeral 1 denotes a cheese-shaped pipe joint in which a connecting portion 12 between a main pipe 11 and a branch pipe portion 14 is curved into an arc, and a portion thereof is an undercut portion 13.

Reference numeral 2 denotes an outer mold having an inner surface matching the outer shape of the pipe joint 1.

The slide cores 3 and 4 have an outer surface that matches the inner shape of the pipe joint 1, and slide cores 3 and 4 have outer surfaces that match the inner shape of the main pipe 11 and can be freely inserted into and extracted from the outer mold 2 from above and below. , a connecting portion 12 excluding the undercut portion 13, and a slide core 5 having an outer surface matching the inner surface shape of the branch pipe portion 14.

As shown in FIGS. 2 and 3, a recess 52 is provided at the front end of the slide core 5, and the insert 6 is mounted within the recess 52.

The front end of the slide core 3 has a surface that comes into contact with the front end of the slide core 4, a concave surface 31 that comes into contact with the front end of the slide core 5, and a part in the middle of the concave surface 31 that is inserted when the mold is clamped, as shown in FIG. A substantially rectangular prism-shaped protrusion 32 is provided for suppressing the movement and fixing the ridge 6.

The front end of the slide core 4 is provided with a concave surface 41 that comes into contact with the front end of the slide core 3, a part of the front end of the slide core 5, and the tip of the insert 6.

The front end of the slide core 5 is provided with a convex surface 51 that comes into contact with the front end side of the slide core 3.4, and the convex surface 51 has a substantially rectangular prism-shaped recess 52 and a guide groove for guiding the protrusion 32 of the slide core 3. 53 is provided, and within the recessed portion 52,
The tip has a convex surface that matches and contacts the concave surface 41 of the slide core 4, and the side surface thereof is an outer surface that matches the inner surface shape of the undercut portion 13 and is located above the concave portion 52 as shown in FIG. The insert 6, which is provided with a stepped portion 61 for regulating the position so that a mold cavity corresponding to the undercut portion 13 can be formed when the insert is moved, is rotated within the recessed portion 52 by the pin 7. It is attached so that it can move freely.

By doing this, the space in the recessed portion 52 that is not occupied by the insert 6 is occupied by the slide core 3.4.5 during mold clamping.
and the insert 6 are in close contact with each other, and are surrounded by them to be sealed.

When molding a pipe joint using the mold of the present invention, first the outer mold 2
The slide core 4 is inserted inside, and then the slide core 5 is inserted and brought into contact with the slide core 4.

Next, when the slide core 3 is inserted, the protrusion 32 of the slide core 3 passes through the guide groove 53 provided at the tip of the slide core 5, presses the insert 6, and slides the insert 6. It is brought into contact with the concave surface 41 of the core 4.

When the mold is completely clamped, all these slide cores 3.4 and 5 are brought into close contact as shown in FIG. 1, and the space in the recessed part 52 provided in the slide core 5 is completely sealed. .

After that, molten resin may be injected and molded.

To take out the molded pipe fitting 1, the mold clamping procedure described above can be performed in reverse. As shown in FIG. If possible, then pull out the slide cores 4 and 5 to insert the insert 6.
As it separates from the undercut portion 13, it gradually moves in the opposite direction to the undercut portion 13 using the pin 7 as a fulcrum, and finally the slide core can be taken out without any hindrance.

Next, the outer mold 2 may be divided and the molded pipe joint 1 may be taken out.

In the pipe joint molding mold of the present invention, a concave surface 31 that comes into contact with the front end of the slide core 5 that molds the branch pipe 14 is formed at the front end of the slide core 3 that molds the main pipe 11, and the concave surface 31 is formed in the middle part of the concave surface 31. Since the protrusion 32 is formed, the protrusion 32 presses the insert from below during mold clamping, rotates the insert, and positions the undercut portion 13 at a predetermined position for molding. It can be fixed to

In addition, the slide core 3.4 is attached to the front end of the slide core 5.
A convex surface 51 that comes into contact with the front end sides of the slide cores 3 and 4 is provided on the front end side of the slide core 3, and a concave portion 52 and a guiding groove 53 for the protrusion 32 of the slide core 3 are provided on the convex surface 51. The insert 6 can be rotatably attached to the part 52, and the protrusion 32 of the slide core 3 is inserted into the guide groove 5 during mold clamping.
3 to fix the mold in place.

Further, the insert 6 has a convex surface that can come into contact with the concave surface 41 of the slide core 4, and is also provided with a stepped portion 61 for regulating the position so that a mold cavity corresponding to the undercut portion 13 can be formed when the mold is closed. Therefore, when the insert 6 moves above the concave portion 52 during mold clamping, the position can be regulated so that a mold cavity corresponding to the undercut portion 13 is formed.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an example of a mold for forming a pipe joint of the present invention, Fig. 2 is a plan view of a slide core having an undercut portion same as above, and Fig. 3 is a perspective view of the slide core shown in Fig. 2. , FIG. 4 is a perspective view of the slide core provided with protrusions, and FIG. 5 is a longitudinal sectional view showing the mold in an open state. 1 is a pipe joint, 2 is an outer mold, 3, 4 and 5 are slide cores, 52 is a recessed portion, 6 is a nest, and 13 is an undercut portion.

Claims (1)

[Claims] 1 A mold for forming a pipe joint in which a main pipe 11 with both ends open and a branch pipe 14 is formed from the center of the main pipe 11, the mold having an outer surface that matches the inner shape of the main pipe 11. Two slide cores 3 and 4 are inserted into the outer mold 2 from opposite directions, and have an outer surface that matches the inner shape of the branch pipe 14, and are inserted into the outer mold 2. In a mold for a pipe joint made of a removable slide core 5, a concave surface 31 that comes into contact with the front end of the slide core 5 is formed at the front end of the slide core 3, and a protrusion is formed in the middle of the concave surface 31. A concave surface 41 that can come into contact with the tip of the insert 6 is formed at the front end of the slide core 4, and a concave surface 41 is formed at the front end of the slide core 5.
, 4 is provided, and the convex surface 51 is provided with a concave portion 52 and a guide groove 53 for the protrusion 32 of the slide core 3, and the insert 6 is placed in the concave portion 52. The insert 6 has a convex surface that can come into contact with the concave surface 41 of the slide core 4, and has an undercut portion 13 curved into an arc at the connection portion between the main pipe 11 and the branch pipe portion 14. The insert 6 has an outer surface that matches the inner shape of the insert 6, and is provided with a stepped portion 61 for regulating the position so that a mold cavity corresponding to the undercut portion 13 can be formed when the mold is closed. 7. A mold for forming a pipe joint, characterized in that the mold is rotatably attached within the concave portion 52 by means 7.