JPH02128807A - Method of fitting insert parts to molding die - Google Patents

Abstract

PURPOSE:To enable fitting within a molding die by modifying insert parts into a regular form, by sticking insert parts to an insert fitting part by being pressed by a slide core. CONSTITUTION:A piece 7a side of L-shaped insert parts is inserted into a groove 17. The other piece 7b side of the insert parts 7 is under a state where it is not controlled at all by situating at a recessed groove 18 side of a movable retainer plate. A rod 29a of an air cylinder 29 is extended and a slide core 10 is moved in the direction of an insert fitting part 16. The other piece 7b side and a corner part 7c of the insert parts 7 are stuck close to the insert fitting part 16 and the insert parts 7 are fitted to the inside of a cavity 11 of a molding die 6. Even if the corner part 7c of the insert parts 7 is not formed into a right angle, the same is pressed by the slide core 10, stuck close to the insert fitting part 16, a form is modified and fitted to the inside of the molding die 6 in a regular form.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of mounting an insert part in a molding die.

(Prior Art) In insert molding, in order to mold the product shape with high precision, it is necessary to mount the insert part in the regular position and shape of the molding die. Therefore, for the insert part W where misalignment is likely to occur, as shown in Japanese Patent Application Laid-Open No. 183111/1984, a slide core is provided in the molding die, and the slide core is moved when the mold is closed to hold the insert part. Is there something that allows you to position it?

In addition, when installing a bent-shaped insert part made of thin plate material into a mold, it is necessary to attach a width that matches the regular shape of the insert part to the mold and has a small dimensional margin greater than the board thickness. There is a method of forming a groove and fitting a part of the insert component into the groove.

To explain this method in detail, as shown in FIGS. 7 and 8, an L-shaped thin plate is formed at a predetermined position within a cavity 3 formed by a movable mold 1 and a fixed mold 2. In accordance with the regular shape of the insert part 4, and 0.02 m to 0.0 m uglier than the plate thickness t of the insert part 4.
A part of the insert part 4 is fitted into the groove 5 formed with a width of about 05+*+i.

(Problems to be Solved by the Invention) However, when inserting a bent insert made of a thin plate into a groove formed in a mold, the following problems occur.

First of all, metal insert parts are usually formed by bending during press forming in the previous process, so it is difficult to form them into a regular shape with a single bending process due to springback. Since the width of the groove formed in the molding die is set to be minute, the insert part must be formed with high dimensional accuracy.

Therefore, the bending process must be performed multiple times using a high-precision press mold, resulting in problems such as high equipment cost and long manufacturing time.

Additionally, in order to achieve automation, when using a robot that automatically fits the insert part into the groove of the molding die,
When insert parts are inserted into grooves set to minute dimensions, the robot arm must be stopped at an accurate position to prevent the parts from hitting the molding mold and deforming it or damaging the molding mold. However, there were problems such as the need for complex control using robots that perform highly accurate movements, which increased equipment costs.

The present invention has been made in view of one or more problems and provides a method for correcting the shape of an insert part in a molding die even if the insert part is not formed into a regular shape.

(Means for Solving the Problems) A method for attaching an insert part to a molding die according to the present invention is to attach a bent-shaped insert part made of a thin plate material to a molding die so that the insert part conforms to one surface of a regular insert part shape. After placing it along the insert mounting part formed in the shape, it is moved toward the insert part, which is a slide core provided so as to be able to move forward and backward with respect to the insert mounting part, and presses the other side of the insert part to press the other side of the insert part. It is characterized by being mounted in the molding die in close contact with the insert mounting part.

(Function) According to this method, the insert part is pressed by the slide core and brought into close contact with the insert mounting part, so that the insert part can be corrected to the regular shape and installed in the molding die. There is no need to form with high dimensional accuracy.

Furthermore, in the case of automation, it is only necessary to place the insert part along the insert mounting portion, so the stopping position of the robot arm is allowed within a certain range.

(Example) Next, an example using the method of attaching an insert part to a molding die according to the present invention will be described based on the drawings. In addition, FIG. 1 is a longitudinal cross-sectional view of the molding die used in this example,
Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is a longitudinal sectional view showing the mold opening state before insert parts are attached to the molding die, and Fig. 4 is a cross-sectional view taken along the line IV-rV in Fig. 3. Fig. 5 is a vertical cross-sectional view showing the mold opening state after the insert part is installed in the mold, and Fig. 6 is a view taken from the ■-■ arrow in Fig. 5. Only the right side is shown because it is symmetrical.

First, the structure of the molding die 6 will be explained. Note that this molding die 6 is used for insert molding with an insert part 7 bent into an L-shape formed in a previous step attached thereto.

The molding die 6 consists of a movable die 8, a fixed die 9, and a slide core lO, and a cavity 11 is formed in which the molds 8, 9, and 10 are combined to form a product.

The movable mold 8 fits into a movable mold plate 12 forming a part of the cavity 11, a support plate 13 that supports the movable mold plate 12, and a through hole 14 formed in the movable mold plate 12. The insert mounting portion 16 is formed in a stepped shape with a height h and has a shape that corresponds to one side of the regular insert component shape. A piece 7 of the insert part 7 in the insert mounting part 16
The part 16a corresponding to the movable side template 12 forms a groove 17 (shown in FIG. 4) whose width is set to be about 0.02 to 0.05-■ wider than the plate thickness t of the insert part 7. Ori,
A portion 15b corresponding to the other piece 7b of the insert component 7 faces the slide core 10 slidably provided in a groove 18 formed in the movable template 12. In addition, in the figure, 19 provided on the movable mold 8 is a runner, 20 is a tunnel gate, 21 is a runner lock pin, and 22 is an ejector pin.

The fixed mold 9 includes a fixed side mold plate 23 that constitutes a part of the cavity 11, and a fixed side mounting plate 2 that supports the fixed side mold plate 23.
4, and a pressure cam 25 that presses the rear end side (right side in the figure) of the slide core 10 to perform backup when the mold is closed. In addition, in the figure, 26 is a spool bushing, and 27 is a locate ring provided on the fixed mold 9.

The slide core IO is slidably provided in a groove 18 formed in the movable template 12, and is formed in a shape that presses the front end side or the other piece 7b side of the insert part 7 and the corner portion 7c. , an inclined surface 10a is formed on the rear end side, with which an inclined surface 25a of a pressure cam 25 provided on the fixed mold 9 comes into contact. A rod 29a of an air cylinder 29, which is attached to the plate 13 via a stay 28, is connected to the rear end of the slide core IO. can move forward and backward with respect to the insert mounting portion 16.

A method for mounting the insert component 7 using the molding die 6 having the above configuration will be explained.

First, when the mold is opened before molding, the slide core 10 is positioned at the retracted end by shortening the rod 29a of the air cylinder 29 (the state shown in FIGS. 3 and 4), and then the slide core 10 is placed in an L-shaped position. The one piece 7a side of the insert part 7 is fitted into the groove 17 formed by the part 16a of the insert mounting part 16 and the through hole 14 formed in the movable side template 12 of the movable die 8. At this time, the other piece 7b side of the insert part 7 is located on the concave groove 18 side of the movable template 12 and is not regulated at all (the state shown in FIGS. 5 and 6).

Next, the rod 29a of the air cylinder 29 is extended and the slide core 10 is moved in the direction of the insert mounting portion 16, and the other piece 7b side of the insert part 7 and the corner portion 7c are pressed, and the Then, the insert part 7 is installed in the cavity 11 of the molding die 6 (the state shown in FIGS. 1 and 2).

At this time, even if the corner part 7C of the insert part 7 is not formed at a right angle, the shape is corrected by being pressed by the slide core 10 and brought into close contact with the insert mounting part 16, so that the molded metal part has a regular shape. It is installed in mold 6.

After that, the mold is closed and the molten resin fills the cavity.
The insert is injected into the mold to form a predetermined insert product.

The molding die 6 for the insert part 7 is formed using such a method.
Even if the insert part 7 is not formed into the regular shape due to springback, etc., it will be corrected to the regular shape before molding and will be installed, so the insert part 7 can be formed with high precision in the previous process. There will be no need.

Furthermore, in order to automate the mounting of the insert part 7, the insert part 7 can be installed by simply fitting one piece 7a side of the insert part 7 into the groove 17 formed by the nest 15 and the through hole 14 of the movable template 12. Since the other piece 7b side of 7 is not restricted, it is allowed within a certain range of the stop position of the robot arm.

Although the method of attaching the L-shaped insert part 7 to the molding die 6 has been described in this embodiment, the present invention is not limited to this, and may be made of a bent plate material. For example, it can be applied to insert parts such as a U-shape.

Furthermore, it is possible to apply not only metal insert parts but also synthetic resin insert parts that have been deformed due to molding distortion or the like.

(Effects of the Invention) As described in detail above, the present invention provides an insert component made of a bent thin plate material along an insert mounting portion formed in a shape that matches a part of one surface of a regular insert component shape. After the insert components are placed in the same position, the slide core presses the insert component to bring it into close contact with the insert mounting portion, so that the shape is corrected and the insert component is mounted in the molding die in a regular shape.

This eliminates the need to form insert parts with high precision in the pre-process, eliminating the need for multiple bending operations using high-precision press molds, reducing equipment costs and shortening the time of the press forming process. Plan,
The manufacturing cost of insert parts is significantly reduced.

Furthermore, when installing insert parts with a robot for automation, the stopping position of the robot's arm is allowed within a certain range, so it is necessary to perform complex control using a robot that operates with high precision. This has the effect of significantly reducing equipment costs.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of a molding die used to carry out the present invention, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a cross-sectional view of the mold shown in Figure 1. A vertical cross-sectional view showing the mold opening state before the insert part is installed in the molding die, FIG. 4 is a view taken along the IT-IV arrow in FIG. 3, and FIG.
A vertical cross-sectional view showing the mold opening state after the insert part is installed in the mold shown in the figure. - Figure 6 is a view taken along the VI-Vl arrow in Figure 5. Figure 7 is a view of the conventional mold. A vertical sectional view showing an example. FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7. 6... Molding die 7... Insert part 1G-... Slide core 16... Insert mounting part Fig. 1 Fig. 3 Fig. 2 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8

Claims (1)

[Claims] (1) After placing a bent-shaped insert part made of a thin plate material in a molding die along an insert mounting part formed in a shape that matches a part of one side of the regular insert part shape, the insert part is mounted. A slide core provided so as to be movable forward and backward with respect to the insert part is moved toward the insert part and presses the other side of the insert part to bring it into close contact with the insert mounting part and to mount it in the mold. How to attach the insert part to the mold.