JP2002205324A - Injection mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection mold capable of rapidly performing the repairing of abrasion generated accompanied by the repetition of the mutual contact of locking parts at the time of mold clamping by simple work without requiring skilled work. SOLUTION: In the injection mold consisting of a fixed template or a fixed template 11 having a core 12 mounted on its molding surface and a movable template 13 and provided with a slide core 14 sliding so as to apply undercut treatment to the movable template 13, a locking part is provided to at least one of the fixed template 11, the core 12 and the movable template 13 and separately manufactured adjusting pieces 18 and 19 are incorporated in the part coming into contact with the locking part on the side of the template of the slide core 14 to form the locking part and comprise a material having hardness lower than that of the locking part on the side of the template.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold having a slide core and capable of easily repairing wear of a locking portion.

[0002]

2. Description of the Related Art Conventionally, injection molding dies having a sliding core for performing an undercut process have been widely used. As such an injection molding die, for example, as shown in FIG. 6, when the inner groove of the container is formed, the slide core b is moved to the inclined pin c with the movement of the movable mold plate a during opening and closing of the mold. Although there is a type that slides along it, there is usually a locking mechanism d, e on the template side as a locking mechanism for preventing rattling during mold clamping.
Locking parts f and g on the slide core side that come into contact with
Is provided.

In manufacturing the mold, the contact between the locking portions d and e on the mold plate side and the locking portions f and g on the slide core side is adjusted. When abrasion occurs, the base materials of the locking portions d and e on the template side and the locking portions f and g on the slide core side are overlaid, and the same adjustment as above is performed.

[0004] However, in particular, the adjustment of the contact surface between the locking portions when repairing wear requires precision machining, and requires a great amount of skill and time.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and requires a skillful operation to repair abrasion caused by repeated contact between the locking portions during mold clamping. An object of the present invention is to provide an injection molding die that can be quickly performed by a simple operation without any problem.

[0006]

SUMMARY OF THE INVENTION The present invention provides a stationary template,
Alternatively, an injection molding die including a fixed-side mold plate having a nest mounted on a mold surface, and a movable-side mold plate, and a slide core that slides so as to perform an undercut process on the movable-side mold plate. Wherein a locking portion is provided on at least one of the fixed-side template, the insert and the movable-side template,
A locking portion is formed by incorporating a separately manufactured adjusting piece into a portion of the slide core that abuts the locking portion on the template side, and the adjusting piece has a hardness higher than that of the locking portion on the template side that abuts. This is an injection mold made of a low material.

In the present invention, a Rockwell hardness C scale (hereinafter referred to as hardness (HRC)) is adopted as a standard of hardness indicating the level of hardness. Needless to say, the hardness of the material of the adjustment piece must be equal to or more than a predetermined value enough to withstand destruction during injection molding.

In the present invention, the locking portion on the template side means a locking portion of the fixed-side template, the insert and the movable-side template.

In the present invention, the adjustment piece must be made of a material having a lower hardness than the locking portions of the fixed-side mold plate, the insert and the movable-side mold plate with which the adjustment piece comes into contact. If the hardness of the adjusting piece is too low, abrasion will be severe, and if the hardness is too high, the locking portions of the fixed-side mold, the insert, and the movable-side mold that come into contact with the adjusting piece will be worn.

[0010]

In the injection mold of the present invention, a locking portion is provided on at least one of the fixed side mold plate, the insert, and the movable side mold plate, and the locking of the slide core on the mold plate side is performed. A locking portion is formed by incorporating a separately manufactured adjustment piece into a portion that abuts the portion, and the adjustment piece is made of a material having a lower hardness than the locking portion on the template side that abuts. The wear of the adjustment piece is caused by the repeated contact between the locking parts of the two parts.Therefore, to repair the wear, remove the worn adjustment piece and assemble a new one without the need for skilled work. It can be done quickly and with a simple task of just digging.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a state of an example of the injection mold according to the present invention when the mold is clamped, and FIG. 2 is a sectional view showing a state when the mold is opened. As shown in FIGS. 1 and 2, the injection mold 1 includes a fixed mold plate 11 and a movable mold plate 13 that can be freely opened and closed.

A part of the mold surface of the fixed mold plate 11 is
2 is mounted so that a part thereof protrudes downward. An inclined surface 121 serving as a locking portion A is provided on a side surface of a portion of the insert 12 protruding from the mold surface of the fixed mold plate 11. A cavity surface 111 is provided on another part of the mold surface of the fixed mold plate 11. An inclined pin 17 whose base end is fixed to the fixed-side mounting plate 16 is inserted through the fixed-side mold plate 11, and the tip of the inclined pin 17 is
It protrudes downward from the remainder of the mold surface in an inclined state.

The mold surface of the movable mold plate 13 is provided with a gap portion 132 through which the slide core mounting recess 131 and the inclined pin 17 pass without contact. The slide core 14 is mounted in the slide core mounting recess 131. The width (width in the left-right direction in the figure) of the slide core mounting recess 131 is larger than the width of the lower portion of the slide core 14 so as to be slidable. The slide core 14 is provided with an inclined pin sliding hole 143, and the tip of the inclined pin 17 is slidably inserted into the inclined pin sliding hole 143. Then, with the movement of the movable mold plate 13 at the time of opening and closing the mold, the inclined pin sliding hole 1 of the slide core 14 is moved.
The sliding core 43 slides along the tip of the inclined pin 17, and thereby the slide core 14 is
The inside can be slid in the horizontal direction (left-right direction in the figure).

The slide core 14 is provided with a protruding portion 142 protruding above one end of the base portion 141. On one side surface of the protruding portion 141, an inclined surface 142a corresponding to the inclined surface 121 of the insert 12 is provided. And the cavity surface 14 on the other side.
2b is provided. On the cavity surface 142b, three protrusions 142c forming an undercut portion are provided at intervals in the horizontal direction.

As shown in FIG. 3, on the inclined surface 121,
A plate-shaped first adjustment piece 18 serving as a locking portion B is incorporated so as to be fixed by bolts 20, 20. As shown in FIG. 4, a plate-shaped second adjustment piece 19 serving as a locking part D is provided at the other end of the base 141.
It is incorporated so as to be fixed at 0 and 20.
As shown in FIG. 5, an annular second adjusting piece 19 ′, 19 ′ serving as a locking part D is incorporated into the other end of the base 141 so as to be fixed by bolts 20, 20. It may be. The other side wall of the concave portion 131 for mounting the slide core of the movable mold plate 13 facing the first adjustment piece 18 incorporated in the base portion 141 is a locking portion C.

At the time of the mold clamping, the locking portions A and C on the template plate side and the locking portions B and D on the slide core side are brought into contact with each other to form a locking mechanism for preventing rattling. Surrounded by the cavity surface 111 of the plate 11 and the cavity surface 142b of the slide core 14,
A cavity 15 having an inner surface shape corresponding to the outer surface shape of the molded article to be molded is formed.

After the molten resin is injected into the cavity 15 and the pressurized state is maintained for a predetermined time, the mold is opened. When the movable mold plate 13 moves during the mold opening, the inclined pin sliding hole of the slide core 14 is moved. By sliding the slide core 143 along the tip of the inclined pin 17, the slide core 14 is slid in the slide core mounting recess 131 in the left lateral direction (left direction in the figure), and three ridges are formed from the product. An undercut portion can be formed by pulling out 142c.

In the injection molding die 1, the material of the fixed side mold plate 11 is, for example, S55C [hardness (HRC):
18], and the material of the insert 12 is, for example, SKD6
1 [adjusted product, hardness (HRC): 40]. The material of the movable mold plate is, for example, S55C [hardness (HR
C): 18], and the material of the slide core 14 is, for example, SKD61 [adjusted product, hardness (HRC): 40]. The material of the first adjustment piece 18 and the second adjustment piece 19, for example, HB _S C48 (copper alloy) [Hardness (HR
C): 16] or S45C [hardness (HRC): 16].

Therefore, the material of the first adjusting piece 18 forming the locking portion B of the slide core 14 is made of a material having a lower hardness than the locking portion A of the abutting insert 12. The second forming D
Is made of a material having a lower hardness than the locking portion C of the movable-side mold plate 13 to be brought into contact with. Wear will occur on the 18 and the second adjustment piece 19 side.

At this time, the wear is repaired by a simple operation of removing the worn first adjusting piece 18 and the second adjusting piece 19 and assembling a new one without requiring any skilled work. , And quickly. The first
The material of the adjustment piece 18 and the second adjustment piece 19 need not necessarily be the same as long as the material satisfies the above relationship.

[0021]

As described above, the injection mold of the present invention is constructed as described above, so that the skill of repairing the abrasion caused by the repetition of the contact between the locking parts at the time of mold clamping can be improved. It can be done quickly with simple tasks without the need.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a closed state of an example of an injection mold according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which the injection molding die shown in FIG. 1 is opened.

FIG. 3 is a left side view illustrating an example of a state in which a first adjustment piece is assembled into a slide core used in the injection molding die shown in FIG.

FIG. 4 is a right side view illustrating an example of a state in which a second adjustment piece is incorporated into a slide core used in the injection molding die shown in FIG.

FIG. 5 is a right side view illustrating another example of a state in which a second adjustment piece is incorporated into a slide core used in the injection mold shown in FIG.

FIG. 6 is a sectional view showing an example of a conventional injection mold having a slide core.

[Explanation of symbols]

 A, B, C, D Locking part 1 Injection molding die 11 Fixed side mold plate 12 Insert 13 Movable side mold plate 14 Slide core 15 Cavity 17 Inclined pin 18 First adjustment piece 19 Second adjustment piece

Claims (1)

[Claims] 1. A slide comprising a fixed mold plate or a fixed mold plate with a nest mounted on a mold surface, and a movable mold plate, wherein the movable mold plate slides to perform undercut processing. An injection molding die provided with a core, wherein a locking portion is provided on at least one of the fixed-side mold plate, the insert, and the movable-side mold plate. A locking portion is formed by incorporating a separately manufactured adjustment piece into a portion that comes into contact with the locking portion, and the adjustment piece is made of a material having a lower hardness than the locking portion on the template side that makes contact. Mold for injection molding.