JPH05169498A - Protective device of mold - Google Patents

Abstract

PURPOSE:To prevent a mold from being broken at a weak part when a slide core is clamped to hold an insert part. CONSTITUTION:In a mold, a cavity 4 is formed by a stationary mold 1, a movable mold 2 and a slide core 3 which is moved in the direction perpendicular to the moving direction of the movable mold 2. An insert part 5 is held between the tip of the slide core 3 and the stationary and movable molds 1 and 2 when the mold is clamped. A groove 6 forming a part of the cavity 4 provided in the movable mold member A is inserted into the groove 6 to reinforce the bulkhead 7 when the slide core 3 is clamped, and retreated from the groove 6 before resin is injected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective device for a molding die which reinforces a thin-walled portion which is weak in strength and is provided in the die when forming a very small molded product.

[0002]

2. Description of the Related Art Conventionally, a mold formed by inserting an insert part is constructed as shown in FIG. This mold includes a fixed mold 1, a movable mold 2, and a slide core 3 slidable in a direction orthogonal to the moving direction of the movable mold 2.
The cavity 4 is formed by clamping the fixed mold 1, the movable mold 2, and the slide core 3 with each other. Further, the insert component 5 to be inserted into the molded product is sandwiched between the tip of the slide core 3 and the fixed mold 1 or the movable mold 2 when the mold is clamped, and the resin is injected into the cavity 4. As a result, a molded product in which the insert component 5 is inserted is formed. In addition, the insert component 5 is set and the slide core 3 is advanced to perform mold clamping, but at this time, even if foreign matter is mixed in or the insert component 5 is caught, the abnormality detection device operates and only an abnormality is detected. The mold does not break (foreign objects and insert parts are weaker and crush).

However, as shown in FIG. 6, the concave groove 6 which is a part of the cavity 4 provided in the movable mold 2 and the insert component 5 form a thin partition wall 7 (for example, a wall thickness of about 0.2 mm). In the case of adjacent molds, if foreign matter is mixed in or the insert part 5 is caught, the slide core 3
There is a problem that the partition wall 7 is crushed when the mold is advanced and clamped.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to weaken a mold when clamping a slide core to clamp an insert part. It is an object of the present invention to provide a protection device for a molding die that can prevent a portion from being damaged.

[0005]

In order to achieve the above-mentioned object, a protection device for a molding die of the present invention comprises a fixed die 1, a movable die 2 and a movable die 2 which move in a direction orthogonal to a moving direction of the movable die 2. A mold that forms a cavity 4 with a slide core 3 that moves, and when the mold is clamped, an insert component 5 is sandwiched between the tip of the slide core 3 and the fixed mold 1 or the movable mold 2, In the mold in which the concave groove 6 which is a part of the cavity 4 provided in 2 and the insert component 5 are adjacent to each other through the thin partition wall 7, the concave portion 6 is inserted into the concave groove 6 when the slide core 3 is clamped. The protective member A is provided to reinforce the partition wall 7 and to escape from the groove 6 before injecting the resin.

The movable mold 2 is provided with a slide core 3 slidably, and the movable mold 2 is inserted into the recessed groove 6 in a state of being separated from the fixed mold 1 to reinforce the partition wall 7. It is also preferable to be characterized. Furthermore, the movable core 2 is provided with a protective member A that is inserted into the groove 6 before the slide core 3 is clamped, and that escapes from the groove 6 after the mold is clamped.
It is also preferable that it is slidably mounted on. Furthermore, the slide core 3 may be inserted into the groove 6 before the die is clamped, and the protective member A may be slidably mounted on the fixed mold 1 so as to escape from the groove 6 after the die is clamped. preferable.

[0007]

According to the above construction, the protective member A is inserted into the concave groove 6 to reinforce the partition wall 7 before the slide core 3 is clamped, and in this state, the slide core 3 is advanced to move the slide core 3 to the mold. After the mold is clamped and the slide core 3 is clamped, the protective member A can be released from the groove 6, and the resin can be injected into the cavity 4 to mold the molded product B. Therefore, when the slide core 3 is clamped, the partition 7 can be reinforced to prevent the mold from being damaged.

[0008]

EXAMPLE First, the example shown in FIG. 1 will be described. The molding die is mainly composed of a fixed die 1, a movable die 2 and a slide core 3. The movable die 2 is vertically movable, and the slide core 3 is horizontally slidable. The cavity 4 is formed by clamping the fixed mold 1, the movable mold 2, and the slide core 3. A molded product B molded by this molding die is a small relay as shown in FIG. 2, for example. This small relay has a contact member 5 as an insert part 5 in a resin body 8.
a is inserted. Then, the insulating wall 1 is provided via the contact member 5a and the minute gap 9 (for example, a gap of about 0.2 mm).
0 is set up. The movable mold 2 is provided with a concave groove 6 for forming an insulating wall 10, and a thin wall 7 for forming a minute gap 9 in the concave groove 6. The protection member A is composed of a movable portion 11 that is movable in the left-right direction and an insertion protection portion 12 that fits in the groove 6.

Therefore, the insertion protection portion 12 of the protection member A is moved above the concave groove 6 with the movable mold 2 opened.
The insertion protection part 12 is inserted into the groove 6 to reinforce the partition wall 7.
In this state, the insert component 5 is set along the partition wall 7 of the movable mold, and the slide core 3 is moved forward to clamp the slide core 3 to clamp the insert component 5.
Accordingly, even if foreign matter is mixed in or the insert component 5 is bitten due to dimensional variation of the insert component 5, it is possible to prevent the mold from being damaged. When such an abnormality occurs, the detection means is activated and stopped. Next, the insertion protection portion 12 is moved upward to pull out the insertion protection portion 12 from the groove 6, and the protection member A is retracted out of the mold. Next, the movable mold 2 is clamped and resin is injected into the cavity 4 to form a molded product B.

Next, the embodiment shown in FIG. 3 will be described. In the case of the present embodiment, a sliding groove 13 is formed in the movable mold 2 so as to be continuous below the concave groove 6, and the insertion protection portion 12 as the protection member A is provided with the concave groove 6 and the sliding groove 13. It is slidably inserted in. The insertion protection portion 12 is slid up and down by a cam plate mounted slidably in the left-right direction of the movable mold 2. When the cam plate is slid left and right from outside the mold, the cam plate is slid. The insertion protection portion 12 is driven up and down in the cam groove. Then, in a state where the movable mold 2 is clamped to the fixed mold 1, the insertion protection part 12 is moved upward to insert the insertion protection part 12 into the groove 6, and the insertion protection part 12 reinforces the partition wall 7. In this state, the slide core 3 is advanced and the mold is clamped to sandwich the insert component 5. Next, the insertion protection portion 12 is pulled out from the groove 6, and resin is injected into the cavity 4 to form a molded product B.

Next, the embodiment shown in FIG. 4 will be described. In the case of the present embodiment, the fixed mold 1 is provided with a sliding groove 13 corresponding to the concave groove 6, and the insertion protection portion 12 of the protection member A is formed.
Is slidably inserted in the sliding groove 13. Then, with the movable mold 2 opened, the insertion protection part 1 of the protection member A
2 is moved downward and the insertion protection portion 12 is inserted into the groove 6 to reinforce the partition wall 7. In this state, the insert component 5 is set along the partition wall 7 of the movable mold 2, and the slide core 3 is advanced to clamp the slide core 3 to clamp the insert component 5. Next, the insertion protection part 12 is moved upward to pull out the insertion protection part 12 from the groove 6, and the fixed mold 1
The lower surface of the mold and the lower surface of the insertion protection portion 12 are flush with each other, the movable mold 2 is clamped, and resin is injected into the cavity 4 to form a molded product B.

[0012]

As described above, according to the present invention, when the slide core is clamped, the protective member is inserted into the groove to reinforce the partition wall, and is provided with a protective member that escapes from the groove before injecting the resin. Before clamping the slide core, insert a protective member into the groove to reinforce the partition wall.In this state, the slide core can be clamped to clamp the insert part. Even if foreign matter is mixed in or the insert parts are bitten due to dimensional variations of the insert parts, the partition walls are protected from damage so that the life of the mold can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

2A and 2B show a molded product molded according to the above, in which FIG. 2A is a plan view and FIG. 2B is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view of another embodiment of the above.

FIG. 4 is a sectional view of still another embodiment of the same.

FIG. 5 is a sectional view of a conventional example.

FIG. 6 is a cross-sectional view illustrating a problem of a conventional example.

[Explanation of symbols]

 A Protective member 1 Fixed mold 2 Movable mold 3 Slide core 4 Cavity 5 Insert part 6 Recessed groove 7 Partition wall

Claims (4)

[Claims] 1. A mold for forming a cavity by a fixed mold, a movable mold, and a slide core that moves in a direction orthogonal to the moving direction of the movable mold, the tip of the slide core when the mold is clamped. The insert part is sandwiched between the mold and the fixed mold or the movable mold, and the concave part which is a part of the cavity provided in the movable mold and the insert part are adjacent to each other via a thin partition wall. 2. A protective device for a molding die, comprising: a protective member which is inserted into a groove to reinforce the partition wall when the slide core is clamped, and which escapes from the groove before injecting resin. 2. The movable mold is provided with a slide core slidably, and the movable mold is provided with a protective member which is inserted into the groove while being separated from the fixed mold to reinforce the partition wall. Item 1. A protection device for a molding die according to item 1. 3. A protective member, which is inserted into the groove before the mold is clamped and is removed from the groove after the mold is clamped, is slidably mounted on the movable mold. 1. A protection device for a molding die according to 1. 4. A fixed mold is slidably mounted with a protective member that is inserted into the groove before clamping the slide core and that escapes from the groove after clamping the mold. 1. A protection device for a molding die according to 1.