JPH0446725B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an improvement in a molding method having an insert.

For plastic molded products having inserts such as assist grips, many molding methods are employed that use molds in which a slide core is provided close to the insert in order to satisfy the product shape.

[Prior Art] A mold having a slide core used in a conventional mold molding method having an insert usually has at least two mold bodies, such as a movable mold or a fixed mold, which are moved relative to each other in one dimension, and The cavity is defined by a slide core that is slidably held on one side of the mold body. The slide core is slidable in a direction substantially perpendicular to the direction of relative movement of one mold body. For example, a mold having a slide core for producing a conventional assist grip has a fixed mold 101 and a movable mold 102 that constitute the mold body, as shown in cross-sections of the main parts in FIGS. 3 and 4.
A slide core 103 that is slidably held on the upper surface of the movable mold 102, a sleeve pin 104 that is held by the movable mold 102 and pushes out the molded product, a sleeve core pin 105 that is coaxially arranged with the sleeve pin, and is opposed to the sleeve core pin 105. The presser pin 1 is slidably held on the fixed mold 101.
06, and an inclined pin 107 that drives the slide core 103.

In the conventional method of molding using this mold, an insert fitting 108 is attached to the sleeve core pin 105 of the working mold 102. After that, the mold is tightened. During this mold clamping, the insert fitting 108 is guided by the sleeve pin 105 and fixed along the mold surface of the movable mold 102 by a presser pin 106. In this state, the movable mold 102 is transferred upward. As the movable mold 102 is transferred, the slide core 103 is simultaneously moved upward, and the tilt pin 107 causes the movable mold 102 to move rightward on the upper surface of the movable mold 102 at the same time. When the mold clamping is completed, the state is shown in FIG. 3, and the cavity A is divided. Thereafter, molten resin is injected into cavity A, cooled and solidified in a mold, and then molded.The molded product is then removed from the mold by opening the mold.

In this conventional molding method, the slide core 1
In order to avoid collision between the tip 103a of 03 and the mold forming method 108 having the insert metal fitting insert,
A gap indicated by B in FIG. 3 was formed. However, as shown in FIG.
Because the pressing force of 6 is weak, insert metal fitting 18
If the sleeve core pin 10 deviates from the predetermined position of the movable mold 102 or the insert fitting itself is distorted, insert the sleeve core pin 10 into the mold body 102.
The insert metal fitting 108 held by the slide core 5 is now interposed between the slide core and the tip 103a of the slide core 103, causing problems such as damage to the tip end 103a of the slide core 103.

[Object of the invention] The present invention overcomes the above-mentioned problems, and
Even if the insert metal held in the mold body is displaced from the specified position or the insert metal itself is slightly distorted, it is possible to insert an insert in which the insert metal is not interposed between the slide core and the sleeve core pin. The object of the present invention is to provide a molding method having the following methods.

[Summary of the Invention] A mold forming method having an insert according to the present invention includes a mold in which a slide core is held by a mold body so as to be slidable in an inclined direction with respect to a direction of relative movement of at least two mold bodies. After holding the insert fitting on one side of the mold body, the slide core is slid and brought into close contact with the insert fitting held in the mold body from an inclined direction to close the mold, and then the mold is clamped. The feature is that the formed cavity is filled with molten resin.

In the mold forming method using the insert of the present invention, the slide core closely contacts the insert fitting from an oblique direction. Therefore, even if the insert is misaligned or distorted, the tip of the slide core will come into close contact with the insert from diagonally above, and the insert will move to the correct position due to the pressing force of the slide core. The insert fitting is held between the mold body and the core tip. This allows stable production with fewer problems during molding.

[Detailed Description of the Structure of the Invention] The movable and fixed mold bodies constituting the mold used in the mold forming method having an insert of the present invention are basically different from the split mold bodies of conventional injection molding and the like. They are essentially the same. In this mold,
An insert fitting is held in at least one mold body. The upper surface of the held insert fitting faces the direction of relative movement of the mold body.
The slide core is slidably held by the mold body holding the insert metal fitting, and its sliding direction is inclined with respect to the direction of relative movement of the mold body.

The shape of the cavity formed by the mold body and the slide core can be varied depending on the application. The degree of inclination between the slide core and the mold body holding the slide core is preferably about 45 to 75 degrees with respect to the direction of relative movement of the mold body. The degree of inclination of the slide core is preferably such that the tip of the slide core of the insert fitting inserted into the mold body approaches the adjacent surface at an angle of about 10 to 45 degrees.

The sliding of the slide core on one side of the mold body is as follows:
It may be mechanically driven by a slide pin using the relative movement of the mold body, or it may be driven using another drive device such as a hydraulic cylinder.

The method of molding with an insert of the present invention uses the above-described mold, and first, an insert fitting is attached to one side of the mold body, and the slide core is driven so that the slide core is tilted with respect to the direction of relative movement of the mold body. The tip of the slide core is brought into close contact with the insert metal fitting from an inclined direction, and the insert metal fitting is held between the mold body and the slide core, and the mold body is clamped to fill the cavity with molten resin. After that, cool and solidify. After this, the mold is opened and the molded product is taken out from the mold. As a method for filling the cavity with molten resin, molding methods such as injection molding, compression molding, and transfer molding can be used.

[Effect of the invention] In the mold forming method having an insert of the present invention,
The slide core is slid on the mold body that slidably holds the slide core in a direction inclined to the direction of relative movement of the mold body, and the tip of the slide core is moved against the insert metal fitting held in the mold body. approach from an inclined direction. Therefore, even if the insert metal fitting is deviated from the specified position, the tip of the slide core will come into contact with the surface of the insert metal fitting, and the movement of the slide core will press the insert metal fitting to the specified position, and the insert metal fitting will remain in the mold. It is held between the main body and the slide core. Therefore, in the molding method using the insert of the present invention, troubles caused by improper attachment of the insert fittings are reduced, and stable molding is possible. Further, since it is not necessary to provide the gap B shown in FIG. 3 as in the conventional molding method, it is possible to partially expose the insert fitting.

[Example] FIGS. 1 and 2 show cross sections of essential parts of a mold used in the mold forming method having an insert of the present invention. In addition, FIG. 1 shows a fixed mold 1 constituting the mold body,
FIG. 2 shows a state in which the movable mold 2 and the slide core 3 are driven to a predetermined mold clamping position and a cavity A is formed, and a state in which the slide core 3 is in the middle of sliding with respect to the movable mold 2.

This mold is composed of a fixed mold 1 forming a mold body, a movable mold 2, a slide core 3, a sleeve pin 4, a sleeve core pin 5, a presser pin 6, and a hydraulic device 7 for driving the slide core 3.
The slide core 3 is held slidably on a sliding surface that forms the upper surface of the movable mold 2 and is inclined at an angle of inclination (θ) of 15 degrees. The insert fitting 8 is made of metal and has a substantially S-shaped cross section and has a through hole that is inserted into the sleeve core pin 5 . The through hole of the insert fitting 8 is inserted into and guided by the sleeve core pin 5, and is fixedly held on the movable mold 2 by a presser pin 6. Slide core 3 is hydraulic device 7
is fixed to the tip of a piston 71 and driven.

The molding method using the insert of this example is as follows:
A mold having the slide core 3 described above is used. Then, as shown in Figure 2, first the movable mold 2
The insert fitting 8 is attached to the sleeve core pin 5 of the sleeve core pin 5, and then the insert fitting 8 is held on the movable mold 2 by the presser pin 6. Thereafter, the piston 71 of the hydraulic device 7 is driven, the slide core 3 is moved along the sliding surface, the slide core tip 3a is brought into close contact with the upper surface of the insert metal fitting 8 from diagonally above, and the insert metal fitting 8 is moved. It is held between the mold body 2 and the slide core 3. After the slide core 3 is driven to a predetermined position in this manner, the movable mold 2 is driven upward and brought into contact with the lower surface of the fixed mold 1 to clamp the mold, resulting in the state shown in FIG. 1. In this state, resin is injected into the cavity A, cooled in the cavity A, and a resin molded product having the insert fitting 8 is molded.

In the molding method using the insert of this embodiment, the tip end 3a of the slide core 3 approaches the upper surface of the insert fitting 8 from diagonally above. Therefore, even if the insert fitting 8 is floating upward, the insert fitting 8 is pressed against the tip 3a of the slide core 3,
The metal insert 8 is returned to the predetermined position, and the metal insert 8 is not compressed between the slide core 3 and the sleeve core pin 5. Therefore, the slide core 3 is not damaged, and an injection molded product having a predetermined insert fitting 8 can be obtained.

[Brief explanation of the drawing]

1 and 2 show the main parts of a mold having a slide core used in the mold forming method with an insert according to an embodiment of the present invention, and FIG. 1 is a cross section of the main part showing the mold in a closed state. Figures 2 and 2 are cross-sectional views of main parts showing the state in which the slide core is in the middle of sliding with respect to the movable mold, and Figures 3 and 4 show the slide core used in a mold forming method with a conventional insert. Fig. 3 is a cross-sectional view of the main part showing the mold in a closed state in a normal state, and Fig. 4 shows the mold.
The figure is a cross-sectional view of a main part showing a state when the slide core is moved in a state where the insert fitting is deviated from a predetermined position. 1... Fixed type, 2... Movable type, 3... Slide core, 4... Sleeve pin, 5... Sleeve core pin, 6... Presser pin, 7... Hydraulic system, 8...
...Insert metal fittings.

Claims (1)

[Claims] 1. A cavity formed by at least two mold bodies, such as a movable mold and a fixed mold, which are relatively movable in one dimension, and a slide core slidably held in at least one of the mold bodies. Using a mold in which the insert fitting is held in the cavity, the insert fitting is held in one of the mold bodies, and the slide core is slid in a direction inclined with respect to the direction of relative movement of the mold body. The tip of the slide core is brought into close contact with the insert metal fitting from an inclined direction, and the insert metal fitting is sandwiched between the mold body and the slide core, and the mold body is clamped, and the molten resin is poured into the cavity. A mold forming method having an insert, characterized in that the insert is filled with and then cooled and solidified.