JPS6334895Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an insert molding die that can mold a resin molded body at a predetermined position with respect to a shape reference portion of an insert part.

When resin is insert-molded into a part of a metal product that will become an insert part, the insert part of the insert part is inserted into a cavity, and the part that connects to the insert part is firmly fixed in the molding die that forms the cavity. . This is because if the cavity is not sealed, there is a risk that the molten resin will flow out from the opening, and that the pressure of the molten resin will exert a large force on the insert part, causing the insert part to deform. Therefore, when resin is insert-molded into a part of the insert component, the insert portion is locally fixed, and the resin is molded to fit the insert portion.
Therefore, if the insert part is distorted when looking at the insert part as a whole, the resin molded product will also not be molded in a predetermined position.

The present invention overcomes this problem. Even if the insert part inserted into the cavity deviates from the shape standard part of the insert part, it is automatically corrected during insert molding, and the resin molded product can be molded in the specified position. The present invention provides an insert mold.

That is, the insert molding die of the present invention includes a reference part fixing member that fixes the shape reference part of the insert part, and at least two split molds that form a cavity and an opening into which the insert part of the insert part is inserted. , at least two members slidably protrude into the opening of the cavity and close the opening by abutting an insert part located within the opening.
The present invention is characterized in that it consists of a door member, and a door member that fixes the state in which the door member is in contact with the insert component.

In the insert molding die of the present invention, the shape reference portion of the insert component is fixed by a reference portion fixing member, and the cavity of the split mold is formed using the reference portion fixing member as a reference. Therefore, even if there is distortion between the shape reference portion of the insert component and the insert portion, the resin molded product will be molded in the correct position with respect to the shape reference portion of the insert component.

That is, the distortion of the shape reference portion of the insert component and the insert portion is absorbed by the opening of the cavity into which the insert portion is inserted. Typically, this aperture is approximately the same shape as that part of the insert part located in the aperture. The opening of the cavity of the present invention is formed larger than the part of the insert part located in the opening, and the part of the insert part located in the opening does not come into contact with the wall surface forming the opening except in special cases. The distortion of the insert component is absorbed by this opening.

The door member closes the gap formed around the insert part in the opening. The door member therefore slidably projects into the opening and abuts the insert part. Since one door member cannot close the gap around the insert part, at least two door members are required. The door member must be able to change the position of contact with the insert component in accordance with the distortion of the insert component.

For this reason, the door member is either pushed into the opening with a weak force that does not substantially deform the insert part and stops when it comes into contact with the insert part, or the pressure of a set of door members is balanced and the insert part It is necessary to prevent deformation from occurring.

There are four main types of distortion in the insert component located in the opening: x-direction, y-direction, z-direction, and torsion centered on the z-direction, assuming that the central axis of the opening is in the z-direction.

Distortion in the z direction can be dealt with by making the cross section of the portion of the insert part located in the opening the same shape.

For x direction, y direction, and twisting, move the door member to
This can be handled by making it rotatable around the y-direction, y-direction, and z-direction. An example is shown in FIG. This forms an opening 13 with a square cross section that opens into a cavity (not shown) formed between the cultures 11 and 12, and opens semicircular door members 14 and 15 in each split mold 11 and 12. 13 and supported by respective springs 16. FIG. 1 shows a state in which the portion of the insert component located in the opening of W is distorted and twisted in the x and y directions. The pair of door members 14 and 15 can completely close the opening 13 without deforming the insert part W. Note that the number of door members does not have to be two, and may be three or more.

Usually, distortion often occurs in one direction. In this case, the opening can be closed without deforming the insert component by widening the opening in the direction in which strain occurs and causing the door member to protrude into the opening parallel to the direction in which strain occurs. An example is shown in FIG. This is provided with an opening 23 having a rectangular cross section that opens into a cavity (not shown) formed between the split molds 21 and 22. The direction of distortion of the insert part W is the longitudinal direction of the opening 13 (vertical direction in the drawing). The door members 24 and 25 are columnar bodies that are biased toward the opening 23 in directions facing each other, and each divided type 2
1 and 22 in a slidable manner, and is biased by a spring 26 so as to protrude into the opening 23. With this pair of door members 24 and 25, the opening can be completely closed without deforming the insert part.

When the door member closes the opening, the cavity is substantially closed. Molten resin is injected or extruded into this cavity, but in order to withstand the pressure of the resin, it is necessary to fix the door member in that state. The door fixing member fixes these door members, and can be fixed by pressing a member perpendicular to the sliding direction of the door member against the door member. Note that the reference portion fixing member and the door fixing member may be driven by using the relative movement of a set of culture members, or by separately providing a hydraulic cylinder or the like and driving the reference portion fixing member and the door fixing member by the hydraulic cylinder or the like. Further, the reference portion fixing member may be provided in one divided mold, or may be provided independently of the divided mold.

Examples will be explained below.

This embodiment is shown in elevational views in Figures 3 and 4.
The present invention relates to an insert molding die for insert molding a pawl portion of a shift fork of an automobile transmission, which is shown in a side view.

The shift fork X consists of two fork parts X1 and X2 shown in FIGS. 3 and 4 and a U-shaped clamp part X3 located in the center.
Claw portions X4 and X5 are insert-molded at the tips of 1 and X2. Fork part X1, X2 and clamp part X
3 is integrally made of cast iron, iron plate, aluminum plate, etc., but it is difficult to achieve relative positional accuracy between the pair of shaft holes X31 and 32 that pass through the clamp part X3 and the clamp recess 33 and the fork parts X1 and X2. In Figure 4, the tips of the fork parts X1 and X2 tend to be distorted to the right or left. In the insert molding die of this embodiment, even if the fork portions X1 and X2 are distorted, the claw portions X4 and X5 are placed in the correct relative positions with respect to the shaft holes X31 and
It is used to mold.

The insert molding mold of this example includes a lower mold 3,
The main components are an upper die 4, a reference portion fixing member 5, two sets of door devices 6, and two sets of door fixing members 7.

A lower mold 3 and an upper mold 4 constitute a set of molds, and two cavities 31 and 32 are formed between them. The lower mold 3 is a fixed mold, and a fixed plate 81 of the molding device
Fixed. On the other hand, the upper mold 4 is a movable mold and is fixed to a movable platen 82 of the molding device.

The reference portion fixing member 5 includes a shaft 51 fixed to the lower die 3 and a support column 5 also fixed to the lower die 3.
2. A positioning pin 53 slidably held on the support column 52, and a link 54 connected to the rear end of the pin 53.
The main components include a link pressing device 55 fixed to the upper die 3. The shaft 51 is located at the center rear of the two cavities 31 and 32, and the shaft hole X3 of the shift fork X is inserted into this shaft 51.
1 and 32 are inserted. The support column 52 is the shaft 5
It is fixed to the lower mold 3 almost parallel to 1. The positioning pin 53 is held by the support column 52 so as to be slidable in the horizontal direction, and is normally biased by a spring 541 of the link 54 and pulled toward the right in FIG.
When the upper mold 4 moves downward, this pin 53
A link pressing device 55 fixed to presses down one end of the link 54 against the spring 541, and moves the positioning pin 53 to the left in FIG. This pin 5
3 moves to the left, and its head becomes a shift fork
The shift fork X is fixed together with the shaft 51 by fitting into the concave portion X33 of the clamp protruding from the center of the clamp portion X3. This shift fork X has shaft holes X31, X32 and clamp recess X.
33 constitutes a shape reference portion. The extrusion device 55 uses a spring 551 to urge the piston 552 downward with a constant load, so that no more than necessary force is applied to the positioning pin 53. In addition,
The spring 551 is stronger than the spring 541.

As shown in FIG.
The relative positions (for example, vertical distance a) of the cavities 31 and 32 in which the cavities 31 and 32 are formed are defined (FIG. 6). As a result, the clamp recess 33 and the cavities 31, 32 are set at predetermined positions regardless of the distortion of the fork portions X1, X2 of the shift fork X.

The door device 6 opens the opening 3 of each cavity 31, 32.
One set each is provided for 3 and 34. This door device 6 is a first door member 6 that is slidably held on the lower mold 3.
1 and a second door member slidably held by the upper mold 4 as the main components. Each door member 61, 62 is projected into the opening 33, 34 with a slight force by a spring 63, 64. This protrusion force is such that the fork portions v1 and X2 of the shift fork X are not substantially deformed, and the door member protrudes into the openings 33 and 34. Therefore, each door member 61, 62 has a fork portion X1, X2.
Depending on the position occupied in the openings 33, 34, the fork portions X1, v2 come into contact with each other and stop at that position. As a result, as shown in FIGS. 3 and 4, the door member 6
1 and 62 are openings 33 and 3 of cavities 31 and 32.
Close 4.

The door fixing member 7 has a first pressure shaft 71 held by the lower mold 3, a second pressure shaft 72 held by the upper mold 4, and a second pressure shaft 71 held by the lower mold 3.
A compression member 73 composed of a disc spring provided at the lower end of the pressure shaft is held by the lower mold 3, and the first pressure shaft 7
The first fixing pin 74 is driven by the second pressure shaft 72 and comes into contact with the side of the first door member 61, and the second fixing pin 7 is driven by the second pressing shaft 72 and comes into contact with the side of the second door member 62.
5 as the main components. The second pressurizing shaft 71, the second
The pressure shafts 72 are both urged by springs 711 and 722 in a direction toward each other. First pressure shaft 71
and the first fixing pin 74 and the second pressurizing shaft 72 and the second
The fixing pin 75 is engaged with a double inclined surface, and when the first and second pressurizing shafts 71 and 72 are biased by springs 74 and 75 and move toward each other, the first and second fixing pins 75 are engaged. The pins 74 and 75 are driven to the left in FIG. 3 and are separated from the first and second door members 61 and 62. The upper die 4 moves downward, and the first pressurizing shaft 71 comes into contact with the compression member 73. When the upper mold 4 further descends, the first and second pressurizing shafts 71 and 72 are moved to the compression shaft member 7.
3, and is pushed back into the respective lower molds 3 and upper molds 4 against the springs 711 and 722. This first,
Due to the movement of the second pressurizing shafts 71 and 72, the first and second
The fixing pins 74 and 75 are driven to the right in FIG. 3, come into contact with the sides of the first and second door members 61 and 62, and press them strongly. Note that the first and second pressurizing shafts 7
The pressing forces of 1 and 72 are balanced by the compression member 73 and made equal. Therefore, the forces with which the first and second fixing pins 74 and 75 press against the first and second door members 61 and 62 are also equal. In this way, the first
The second door members 61 and 62 are fixed.

In this state, as shown in FIG. 4, molten nylon is injected into the cavities 32 and 33 and insert molded to form the claw portions X4 and X5. In FIG. 1, the second door members 61 and 62 are strongly fixed by the first and second fixing pins 74 and 75, so they can withstand the resin pressure during molding, and the predetermined claw portions
4.X5 can be insert molded.

In this embodiment, the reference portion fixing member 5 and the door fixing member 7 are all driven using the stroke of the upper die 4, but separate drive sources such as hydraulic cylinders may be used.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main part showing an example of a door member for a cavity opening according to the present invention, Fig. 2 is a sectional view of the main part showing another example similar to Fig. 1, and Figs. A shift fork molded according to an embodiment of the present invention is shown, FIG. 3 is an elevation view thereof, FIG. 4 is a side view thereof,
FIG. 5 is a schematic cross-sectional view of an insert molding die showing an embodiment of the present invention, and FIG. 6 is an enlarged cross-sectional view of the main part of FIG. 11, 12, 21, 22... split mold, 13,
23...Opening, 14, 15, 24, 25, 61,
62...Door member, 3...Lower mold, 4...Upper mold, 5...
...Reference part fixing member, 6... Door device, 7... Door fixing member, W, X... Insert parts.

Claims (1)

[Claims for Utility Model Registration] A reference part fixing member for fixing the shape reference part of the insert part; at least two split molds forming a cavity and an opening into which the insert part of the insert part is inserted; and the cavity. slidably protrudes into the opening of;
At least two door members that close the opening by contacting the insert part located in the opening, and a door fixing member that fixes the state in which the door member contacts the insert part. insert mold.