JP2008229999A - Resin molding mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin molding mold having a simple structure and allowing precise positioning of an insert member. <P>SOLUTION: The resin molding mold 1 positions an insert metal fitting 2 by engaging an engagement protrusion part 2a of the insert metal fitting 2 with an engagement recess part 1c of the mold 1 under the injection pressure of a resin material produced on injection of the resin material into a molding space 1a through an injection inlet 1b. A slide pin 3 which faces the injection inlet 1b through the molding space 1a is always energized toward the side of the injection inlet 1b with a coil spring 4 is arranged in a slidable way. A guide recess part 3a is formed at the tip of the slide pin 3, and a guide protrusion part 2b to be engaged in the guide recess part 3a in a removable way is arranged on the insert metal fitting 2. The insert metal fitting 2 is lifted while centering with respect to the guide protrusion part 2b and the guide recess part 3a, and the engagement protrusion part 2a and engagement recess part 1c are engaged together while centering. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a resin mold.

  A high-load transmission belt is known in which a large number of resin blocks are mounted side by side in the longitudinal direction of a tension band formed on an endless (see, for example, Patent Document 1).

  Each of the resin blocks constituting this belt is substantially H-shaped with a center pillar in the middle between the upper beam and the lower beam inside the resin body made of composite resin and carbon fiber. The insert metal fitting formed integrally with is embedded as a reinforcing member.

  In this way, in order to mold so that the insert metal fitting is embedded in the inside of the resin body, for example, as shown in FIG. When the resin material is injected through the inlet 101b after the insert metal fitting 102 is mounted in the mold 101, the insert metal 102 is inserted into the mold 101 by the injected resin material. The insert metal fitting 102 is positioned by fitting the concave portion 101a and the convex portion 102a so as to be fitted into the concave portion 101a.

By the way, when molding so that the insert metal fitting is embedded inside the resin molded body, a positioning ball with a spring and a magnet are arranged at the mounting portion of the insert metal fitting on the molding surface of the lower mold, and in the hole of the insert metal fitting. It is known that the ball is engaged and the insert fitting is positioned at a predetermined position below and held in that state by a magnet (for example, see Patent Document 2).
Japanese Unexamined Patent Publication No. 07-305745 (paragraphs 004, 005 and FIG. 8) Japanese Utility Model Publication No. 07-015314 (paragraph 0014 and FIG. 2)

  In the case shown in FIG. 5, positioning is possible to some extent by the spigot portion including the concave portion 101 a and the convex portion 102 a, but due to the variation in the size of the insert fitting 102, the insert fitting 102 moves to the left and right by 0.1 mm. Therefore, there is a risk that the insert metal fitting 102 may be displaced or tilted in the left-right direction. This causes variations in product performance and needs to be avoided.

  Further, in the technique described in Patent Document 2, since the ball is engaged with the hole of the insert metal fitting, the engagement of the ball with the hole of the insert metal fitting is unstable. A magnet is required and the number of parts increases.

  An object of the present invention is to provide a resin molding die that can accurately position an insert member with a simple structure.

The invention of claim 1 has an injection port for injecting a resin material into the molding space, and has an engagement concave portion or an engagement convex portion facing the injection port and sandwiching the molding space, through the injection port. The engaging convex portion or engaging portion of the insert member having the engaging convex portion or the engaging concave portion corresponding to the engaging concave portion or the engaging convex portion by the injection pressure when the resin material is injected into the molding space. A resin molding die for positioning the insert member by engaging a concave portion with the engaging concave portion or the engaging convex portion. The slide pin member slides across the molding space so as to face the injection port. A guide recess or guide protrusion is provided at one of the tip of the slide pin member or the insert member, and a guide protrusion is detachably engaged with the guide recess or guide protrusion. Is provided with the guide recess,
The slide pin member is always urged toward the inlet side.

  In this way, the insert member moves toward the slide pin member due to the injection pressure when the resin material is injected into the molding space, so that the insert member is provided at one end of the slide pin member or one of the insert members. The guide concave portion or guide convex portion and the guide convex portion or guide concave portion provided on the other side are detachably engaged to perform positioning in the first stage. With the positioning maintained, the insert member further moves to the slide pin member side, so that the engagement convex portion or the engagement concave portion of the insert member can be easily pushed into the engagement concave portion or the engagement convex portion of the mold. Engaged. Since the engagement convex portion and the engagement concave portion between the mold and the insert member are engaged with each other while the positioning is performed by the engagement between the guide concave portion and the guide convex portion, the engagement convex portion is engaged. Even if the positioning accuracy of the insert member due to the engagement with the recess is not so high, the insert member is positioned with high accuracy.

  As described in claim 2, the slide pin member is configured to be constantly urged by a spring member toward the injection port side, and the spring force of the spring member is greater than the resin injection pressure during injection molding. It can be set as the structure set small.

  In this way, when the insert member is pressed in the direction in which the engaging convex portion engages with the engaging concave portion due to the injection pressure of the resin material, the slide pin member is pressed against the insert member, The spring member is compressed and retracted. At this time, the slide pin member moves backward while maintaining the positioning state due to the engagement between the guide concave portion and the guide convex portion, so that the insert member moves while being guided, and the engagement convex portion and the engagement concave portion are engaged. The match is done without difficulty.

  According to a third aspect of the present invention, the slide pin member and the spring member can be integrally formed.

  If it does in this way, the number of parts can be reduced and the effect similar to Claim 2 can be exhibited.

  According to a fourth aspect of the present invention, the slide pin member may be configured to be provided at a center portion of the fitting recess or the fitting projection provided in the mold.

  By doing so, the insert member is centered by the engagement relationship between the insert member and the slide pin member by the engagement convex portion and the engagement concave portion, so that the engagement between the engagement convex portion and the engagement concave portion is impossible. Done without.

  According to a fifth aspect of the present invention, the guide convex portion may be a convex portion having a mountain-shaped cross section, and the guide concave portion may be a concave portion having a shape corresponding to the guide convex portion.

  If it does in this way, engagement with a guide crevice and a guide convex part will be made reliably and accurately.

Since it comprised as mentioned above, since this invention engages the engagement convex part and engagement concave part of a metal mold | die and an insert member in the state positioned by engagement with a guide concave part and a guide convex part, The insert member can be accurately positioned without increasing the positioning accuracy of the insert member by the engagement convex portion and the engagement concave portion.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory view showing a schematic configuration of a resin molding die according to the present invention. This resin molding die is an injection of the resin block in the high load transmission belt, in which a large number of resin blocks are mounted side by side in the longitudinal direction of the endlessly formed tension band, and in which the insert metal fitting is embedded. It is used for molding.

  As shown in FIG. 1, the mold 1 has a molding space 1a and an injection port 1b for injecting a resin material S into the molding space 1a. Further, an engaging recess 1c is formed facing the injection port 1b and sandwiching the molding space 1a. The insert fitting 2 embedded in the resin block has an engaging convex portion 2a corresponding to the engaging concave portion 1c. The insert metal fitting 2 is positioned with respect to the mold 1 by engaging the engagement concave portion 1c and the engagement convex portion 2a, and molding is performed in this state.

  The engaging protrusion 2a of the insert fitting 2 is engaged with the engaging recess 1c by the injection pressure when the resin material S is injected into the molding space 1a through the injection port 1b.

  The insert fitting 2 is substantially H-shaped corresponding to the shape of the resin block that is the product to be molded, and connects the upper beam 2A, the lower beam 2B that extends in parallel to the lower beam 2a, and the central portion thereof. And a center pillar 2C extending in the vertical direction. The engaging concave portion 1c is a concave portion having a trapezoidal cross section, and the engaging convex portion 2a is a convex portion having a trapezoidal cross section.

  The mold 1 is provided with a slide pin 3 (slide pin member) slidably facing the injection port 1b and sandwiching the molding space 1a. A guide recess 3 a is provided at the tip of the slide pin 3, and a guide protrusion 2 b that is detachably engaged with the guide metal recess 3 a on the insert fitting 2. The slide pin 3 is always urged by a coil spring 4 (spring member) so as to protrude toward the inlet 1b. The spring force of the coil spring 4 is set to be smaller than the resin injection pressure through the injection port 1b when the resin material S is injected (injection molding). Since the slide pin 3 is cylindrical, the coil spring 4 is arranged inside the slide pin 3. However, when the slide pin is cylindrical, the coil spring is pushed so as to push the rear end thereof. It is also possible to arrange.

  The guide convex portion 2b has a mountain-shaped cross section, and the guide concave portion 3a is a concave portion having a shape corresponding to the guide convex portion 2b. And the guide convex part 2b is provided in the center part of the engagement convex part 2a (insert metal fitting 2), and the fitting recessed part 3a is provided in the front-end | tip center part of the slide pin 3 provided in the engagement recessed part 1c. . In addition, the shape of the guide convex part 2b is not restricted to a cross-sectional chevron shape, What is necessary is just to be able to exhibit a positioning function by engagement with a guide recessed part and a guide convex part, For example, it can also be set as hemispherical shape.

Then, the process of insert-molding the insert metal fitting 2 in the resin material S and molding the resin block using the mold 1 will be described.
(Mounting)
As shown in FIG. 2A, the insert fitting 2 is mounted in the molding space 1 a of the mold 1. At this time, the slide pin 3 is retracted to avoid interference between the slide pin 3 and the insert metal fitting 2 so that the insert metal fitting 2 can be easily attached.
(Clamping)
As shown in FIG. 2B, the slide pin 3 is moved in the direction of the injection port by the spring force of the coil spring 4 during the mold clamping operation. By this movement, prior to the engagement between the engagement recess 1c and the engagement protrusion 2at, the guide protrusion 2b and the guide recess 3a are fitted to each other, and the insert fitting 2 is positioned at the substantially central position and elastic in the injection direction. Will be lifted up.
(Molding)
As shown in FIG. 2 (c), the insert metal fitting 2 is moved in a direction in which its engaging convex portion 2a engages with the engaging concave portion 1c by the injection pressure (injection pressure) of the resin material S through the injection port 1b. Pressed. As a result, the slide pin 3 is pushed back by the insert fitting 2 and the coil spring 4 is compressed. At this time, the insert fitting 2 is pushed while maintaining the state of being positioned at the substantially central position by engaging with the guide convex portion 2b and the guide concave portion 3a, so that the insert metal fitting 2 is engaged with the engaging convex portion 2a positioned at the substantially central position. Engagement with the joint recess 1c is performed without difficulty.
(removal)
As shown in FIG. 2D, when the product is taken out, the slide pin 3 is retracted to release the engagement between the guide convex portion 2b and the guide concave portion 3a. Block 11 (see FIG. 3) can be removed.

  As shown in FIG. 3, the resin block 11 is formed by embedding an insert fitting 2, which will be described later, in a predetermined positional relationship in a main body portion 12 made of the resin material S. The resin block 11 is formed by the insert fitting 2. Is reinforced.

  As described above, in the mold clamping to molding, the engagement protrusions 2 are located at substantially the center positions while maintaining the state in which the insert metal fitting 2 is positioned at the substantially center position by the engagement with the guide protrusion 2b and the guide recess 3a. Since the portion 2a is engaged with the engagement recess 1c, the positioning accuracy of the insert fitting 2 by the engagement protrusion 2a and the engagement recess 1c does not need to be increased so much. It can be about 2 to 1/5.

  In addition to the above, the present invention can be modified as follows.

(i) In the above embodiment, the present invention is applied to a mold used for molding a block used for a belt for high load transmission, but it can be applied to a mold used for molding other products as well. Needless to say, you can.

  (ii) In the above-described embodiment, the engagement recess 1c is provided in the mold 1 and the engagement protrusion 2a is provided in the insert fitting 2. Conversely, the engagement protrusion is provided in the mold, and the insert fitting 2 is provided. It is also possible to provide a configuration in which an engagement concave portion is provided on the.

  Similarly, a guide recess 3 a is provided at the tip of the slide pin 3, and a guide protrusion 2 b is provided on the insert fitting 2. Conversely, a guide protrusion is provided at the tip of the slide pin 3, and a guide recess is provided in the insert fitting 2. It is also possible to provide a configuration.

(iii) In the above-described embodiment, the slide pin 3 and the coil spring 4 are separate members. However, as shown in FIG. 4A, the number of parts can be reduced as a pin member formed integrally. Is also possible. As shown in FIG. 4B, the pin member includes a slide pin portion 11A (slide pin member) that is provided at the distal end portion and that functions as a slide pin, and a support portion that is provided at the proximal end portion and does not move. A base portion 11B that exhibits the above function, and a spring portion 11C (spring member) that is provided between them and elastically connects between the slide pin portion 11A and the base portion 11B. In a state where the spring portion 11C is extended, a certain gap corresponding to the stroke amount of the slide pin portion 11A is formed between the slide pin portion 11A and the base portion 11B. In addition, engaging convex portions 11Aa and 11Ba are formed on the slide pin portion 11A and the base portion 11B, and the slide pin portion 11A and the base portion 11B are configured not to be inadvertently disconnected due to their engagement relationship. In addition, 11Ab is a guide recessed part.

It is explanatory drawing which shows schematic structure of the resin molding metal mold | die which concerns on this invention. (A)-(d) is explanatory drawing of a formation process, respectively. It is explanatory drawing of the resin block which is a molded article. Other embodiment is shown, (a) is a figure similar to FIG. 1, (b) is an enlarged view of a pin member. It is a figure similar to FIG. 1 about a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin molding die 1a Molding space 1b Inlet 1c Engagement recessed part 2 Insert metal fitting 2a Engagement convex part 2b Guide convex part 3 Slide pin 3a Guide recessed part 4 Coil spring 11 Pin member 11A Slide pin part 11C Spring part

Claims (5)

An injection port for injecting a resin material into the molding space, and having an engagement recess or an engagement projection facing the injection port and sandwiching the molding space, and the resin into the molding space through the injection port Depending on the injection pressure at the time of injecting the material, the engaging convex portion or engaging concave portion of the insert member having the engaging convex portion or engaging concave portion corresponding to the engaging concave portion or engaging convex portion is changed to the engaging concave portion or A resin molding die for positioning the insert member by engaging with an engaging convex portion,
A slide pin member is slidably provided across the molding space facing the injection port,
A guide recess or guide protrusion is provided on one of the tip of the slide pin member or the insert member, and a guide protrusion or guide recess that is detachably engaged with the guide recess or guide protrusion on the other,
The resin molding die, wherein the slide pin member is constantly urged toward the inlet side. The slide pin member is configured to be constantly urged by a spring member toward the inlet side,
2. The resin molding die according to claim 1, wherein the spring force of the spring member is set smaller than a resin injection pressure at the time of injection molding.   The resin molding die according to claim 2, wherein the slide pin member and the spring member are integrally formed.   The resin molding die according to any one of claims 1 to 3, wherein the slide pin member is provided at a center portion of a fitting recess or a fitting projection provided in the die. The guide convex portion is a convex portion having a mountain-shaped cross section,
The resin molding die according to claim 1, wherein the guide recess is a recess having a shape corresponding to the guide protrusion.

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