JP2003231158A - Injection molding die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize an injection molding die which can dispense with the manual labor and extra time to cut the embossing part of a molding die to the three-dimensional curved surface and unload the die from an injection molding machine and disassemble the die each time an injection shot is made during test molding. <P>SOLUTION: In this injection molding die 200, an embossing pin 6 is fitted into a fixed half 1 of the die 200 in such a way that the pin 6 moves forward/ backward in the vertical direction, while the pin 6 is urged by means of a coil spring 8, and a semi-spherical part 18 formed at the tip of the embossing pin 6 urged by a coil spring 8 is moved back and forth to a cavity 3 by moving forward/backward the semi-spherical part 18 while an adjusting pin 7 is screwed into a truncated-core-shaped hole 19 from the side face of the fixed half 1 and also by advancing/retreating the truncated-core-shaped part 24 formed at the tip of the adjusting pin 7 while sliding the truncated-core-shaped part 24 to the truncated-core-shaped hole 19 of the embossing pin 6. Thus it is possible to achieve the advancing/receding action of the semi-spherical part 18 at the tip part of the embossing pin 6, to a cavity 3. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold for embossing a film of a resin molded product obtained by integrally molding a film. 2. Description of the Related Art A name plate of a soft plastic film (hereinafter, referred to as a film) is integrally formed on a resin case for display, switch operation, and the like on a resin case covering the appearance of a product. When the switch is operated through this film, the film is sandwiched between a concave portion and a projecting portion formed in a mold at the time of integral molding, so that the switch portion has a click feeling, and an arc-shaped projection (hereinafter, referred to as a film) is formed on the film. Embossing). Conventional injection mold 10
0, as shown in FIG. 3, 101 is a fixed mold, 102 is a movable mold, 103 is a cavity, A is a film mounted on the movable mold, 104 is a recess formed in the movable mold, and 105 is a fixed mold. It is constituted by the projected part. The operation of the injection mold 100 having the above configuration will be described. In the process in which the film A is mounted on the movable mold 102 and the fixed mold 101 and the movable mold 102 are closed, the fixed mold 101 is The protruding portion 105 pushes up the film A, and the film A is sandwiched between the concave portion 104 and the protruding portion 105.
Is formed. After that, the molten resin C
Then, the film A and the molten resin are integrated to form a molded product D as shown in FIG. When the above-described embossing process is performed on the conventional injection mold having the above-described structure, when the film is wrinkled or flawed, the height of the arc-shaped protrusion formed on the fixed mold is increased. (T) is adjusted. However, fine adjustment of the height (t) of the projection is performed while checking the molded product while performing test molding, and when the adjustment is performed with the mold attached to the molding machine, the adjustment of the fixed mold and the movable mold is performed. Squeeze the body in between and cut the protrusion with a diamond file,
If that is not possible, once lower the mold from the molding machine,
In the disassembled state, the three-dimensional curved surface at the tip of the projection had to be cut manually. Therefore, in the former case, the adjustment was very difficult and involved a dangerous operation.
In the latter case, much time and effort was required. The present invention has been made in order to solve such a problem, and in test molding, a dangerous operation such as cutting a protrusion of a mold while being attached to a molding machine is unnecessary, and It is an object of the present invention to provide an injection molding die that does not require the labor and labor of unloading and disassembling the die from an injection molding machine for each molding shot, and can achieve safety and labor saving in die adjustment work. . According to the present invention, there is provided an injection mold, comprising: a fixed mold, a movable mold fixed to the fixed mold so as to advance and retreat, a cavity formed by the fixed mold and the movable mold, It has a film mounted on a movable die, a concave portion formed on the movable die, and a protrusion formed on the fixed die, and the film is sandwiched between the concave portion and the protrusion by closing the fixed die and the movable die. An embossing pin, which is fitted into a fixed mold so as to be able to advance and retreat with respect to a cavity, a projection formed on a cavity surface of the embossing pin, and an embossing pin. Frusto-conical hole drilled on the side of the screw, and a screw hole threaded from the fixed side to the frusto-conical hole, and screwed into the screw hole, the frusto-conical tip is frusto-conical A frusto-conical pin that wedges into the hole, Having a biasing means for biasing the boss pin against the cavity, rotating the frustum-shaped pin, and moving the embossed pin forward and backward with respect to the cavity by moving the frustum-shaped hole toward and away from the cavity. I do. FIG. 1 shows an injection mold 20 according to the present invention.
0 is a cross-sectional view illustrating a configuration of a main part of an embodiment of the present invention, illustrating a mechanism for adjusting a height (t) of a protrusion for processing an emboss. The injection mold 200 is configured as follows. Injection Mold 200 of the Present Invention
As shown in FIG. 1, 1 is a fixed mold, 2 is a movable mold, 3 is a cavity, A is a film mounted on the movable mold, 4 is a recess formed in the movable mold, and 5 is provided on the fixed mold 1. And an emboss height adjustment mechanism provided. Fixed type 1
The movable mold 2 is fixed to an injection molding machine (not shown), and is fixed to the injection molding machine so as to be able to advance and retreat with respect to the fixed mold 1. A cavity is formed in a space where the mold 1 and the movable mold 2 are closed and opposed to each other. The film A is mounted on the cavity surface of the movable mold 2. Further, the movable die 2 is formed with a concave portion 4 for forming an emboss B at a predetermined position of the film A. Next, the configuration of the embossing height adjusting mechanism 5 will be described. The embossing height adjusting mechanism 5 includes an embossing pin 6, an adjusting pin 7,
It comprises a coil spring 8 and a holo set 9. A stepped hole 10 penetrates through the fixed die 1 substantially perpendicular to the surface of the cavity 3. In the stepped hole 10, a small inner diameter portion 11, a middle inner diameter portion 12, and a large inner diameter portion 13 are respectively formed in order from the surface of the cavity 3 downward, and the small inner diameter portion 11,
A flange 1 is formed perpendicularly to the center line of the stepped hole 10 on the joint surface reaching the inner diameter portion of the middle inner diameter portion 12 and the inner diameter portion 13.
4 and 15 are formed. Further, a female screw having a predetermined length is screwed into the large-diameter portion 13 from an opening below the large-diameter portion 13, and the horo set 9 is screwed into the female screw. An embossing pin 6 is slidably fitted in the stepped hole 10. The embossing pin 6 is provided with the small inner diameter portion 11.
The shaft portion 16 is slidably fitted to the head portion 17 and the head portion 17 is inserted into the large-diameter portion 13. The tip of the shaft portion 16 has a semi-spherical shape (hereinafter, referred to as a semi-spherical portion 18). It has been processed. The head 17 can be moved within the large-diameter portion 13 by a predetermined distance by screwing the horo set 9 into the female screw of the large-diameter portion 13. The moving distance of the head 17 is the movement required for finely adjusting the emboss height (processed into the film A) by moving the semi-spherical portion 18 at the tip of the embossing pin 6 into and out of the cavity. Distance (s). (As shown in FIG. 2, the optimal height from the cavity surface to the tip of the hemispherical portion 18 is (t),
The fine adjustment width before and after t is s. The semi-spherical portion 18 at the tip of the embossing pin 6 faces the concave portion 4 formed in the movable die 1 via the film A when the fixed die 1 and the movable die 2 are closed, and 18 between the recess 18 and the recess 4
The emboss B is processed by sandwiching and pressing. Further, the middle inner diameter portion 1 of the shaft portion 16 of the embossing pin 6 is formed.
2 and the flange 14 of the stepped hole 10
The coil spring 8 sandwiched between the head of the embossing pin 6 and the upper surface of the head 17 of the embossing pin 6 urges the head 17 of the embossing pin 6 downward. Therefore, the head 17 of the embossing pin 6
Can move while being urged by the coil spring 8 between the flange 15 of the stepped hole 10 and the upper surface of the horo set. Further, on the side surface of the shaft portion 16 of the embossing pin 6, a truncated conical hole 19 perpendicular to the axis of the embossing pin 6 is provided.
Is formed. The fixed die 1 is provided with a stepped hole 20 coaxially with the truncated conical hole 19 from the side surface of the fixed die 1. The stepped hole 20 is provided with the stepped hole 10.
The small inner diameter portion 11 is opened to the inner wall of the small inner diameter portion 11, and a small inner diameter portion 21 and a large inner diameter portion 22 are bored in order from the inner wall opening to the left. I have. A female screw is threaded on the inner periphery of the large inner diameter portion 22. The adjustment pin 7 is screwed into the stepped hole 20. Adjusting pin 7
Is a headed pin, and the pin portion 23 is inserted through the small inner diameter portion 21, and has a frusto-conical portion 24 at the tip of the pin that fits into the frusto-conical hole 19 of the embossing pin 6. Adjusting pin 7
A male screw is threaded on the outer periphery of the head 25, and is screwed into a female screw of the large inner diameter portion 22 of the stepped hole 20. As shown in FIG. 2, by rotating the head 25 of the adjustment pin 7, the space of the large inner diameter portion 22 can be moved right and left by a predetermined distance, and the truncated conical portion 24 at the tip end of the adjustment pin 7 can be moved. The embossing pin 6 moves right and left while sliding in a wedge shape with respect to the truncated conical hole 19 of the embossing pin 6. The adjusting pin 7 advances and retreats in the stepped hole 20, so that the truncated conical hole 1 of the embossing pin 6 always urged downward by the coil spring 8.
The inner wall 9 moves vertically while sliding on the truncated conical portion 24 of the adjustment pin 7, and the semi-spherical portion 18 at the tip of the embossing pin 6 moves vertically with respect to the cavity 3.
The molding operation of the injection molding die of the present invention having the above-described configuration will be described. When the injection mold 200 is in the open state, the film A is mounted on the movable mold 2. Next, the movable mold 2 is advanced with respect to the fixed mold 1 to close the mold. Simultaneously with the closing of the mold, the film A is sandwiched between the concave portion 4 of the movable mold 2 and the semi-spherical portion 18 of the fixed mold 1, and the emboss B is formed on the film A. Next, in cavity 3,
Molten resin C is injected from an injection molding machine not shown,
A portion other than the emboss B is filled with the molten resin C. Next, when the molten resin C is cooled and solidified, the movable mold 2 is moved to the fixed mold 1.
Then, the mold is opened, and as shown in FIG. 4, a molded product D integrally formed with the film A is taken out of the mold.
In the above-described injection molding operation, the emboss B of the film A is used.
In the case where wrinkles or scratches occur, the adjusting pin 7 is rotated to retreat the frustoconical portion 24 to the left and the semi-spherical portion 18 at the tip of the embossing pin 6 is slightly lowered (for example, When the adjustment pin 7 makes one rotation, the semi-spherical portion 18 moves about 0.1 mm.) Wrinkles and scratches can be taken.
The wrinkles appear radially as kinked lines of the film A, and when the wrinkles are further advanced, they are flaws, and when they are extremely advanced, tears are generated therefrom. Also, if the film is not pressed at the optimum height (t) without wrinkling, cracks may occur during repeated use of embossing while using the product. Also, the optimum height (t) of the semi-spherical portion 18 that pushes up the film A slightly differs depending on the material and thickness of the plastic. Therefore, according to the present invention, the fine adjustment by the adjustment pin 7 as described above is repeated while performing the test molding, and the optimum height (t) of the semi-spherical portion 18 where no wrinkles are generated while the mold is attached to the injection molding machine. ) Can be adjusted. Emboss B is used to operate switches and the like, and the operation feeling (click feeling) varies depending on the emboss height. Test molding is performed while confirming the click feeling of the emboss of the molded product, and the optimum click feeling is obtained. You can also adjust the emboss height. In this embodiment, the embossing pin 6 is provided directly on the fixed mold. However, the embossed pin 6 may be provided on the cavity mold by separately nesting the cavity mold inside the fixed mold. According to the above-described structure of the present invention, in test molding, there is a danger of cutting a protruding part by inserting a body between dies while being attached to a molding machine. This eliminates the need for work, and eliminates the labor and time required to remove the mold from the injection molding machine for each molding shot and disassemble it to cut the protrusions in order to avoid dangerous work as described above. In addition, it is possible to perform an operation of adjusting the die of the embossed protrusion in a short time with a small amount of labor, and to realize an injection molding die that can achieve safety and labor saving of the die adjusting operation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view illustrating a state in which an adjustment pin is pushed rightward in an emboss height adjustment mechanism of an injection mold according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state in which the adjustment pin is retracted to the left. FIG. 3 is a sectional view of a conventional injection mold. FIG. 4 is a cross-sectional view of a film-integrated molded product having an emboss. [Description of Signs] 1 Fixed mold 2 Movable mold 3 Cavity A Film 4 Recess 6 Emboss pin 18 Semicircular part (projection) 19 Truncated conical hole 20 Stepped hole (screw hole) 24 Truncated conical part (Truncated cone) 8) Coil spring (biasing means) 10 Wrinkle presser pressure adjustment mechanism

   ────────────────────────────────────────────────── ─── Continuation of front page    F term (reference) 4F202 AD08 AG21 CA11 CB01 CB13                       CK82 CK90 CQ01                 4F206 AD08 AG21 JA07 JB13 JN25                       JQ81

Claims (1)

Claims: 1. A fixed mold, a movable mold fixed to the fixed mold so as to advance and retreat, a cavity formed by the fixed mold and the movable mold, and a film mounted on the movable mold. And a recess formed in a movable mold, and a protrusion formed in a fixed mold, and when the fixed mold and the movable mold are closed, a film is sandwiched between the recess and the protrusion, and a predetermined In an injection mold in which an emboss is formed at a position, in the fixed mold,
An embossing pin fitted to the cavity so as to be able to advance and retreat, a projection formed on a cavity surface of the embossing pin, a truncated conical hole formed in a side surface of the embossing pin, and a side surface of the fixed mold. A threaded hole threaded to the frusto-conical hole, and a frusto-conical pin screwed into the threaded hole and having a frusto-conical tip fitted wedge-shaped with respect to the frusto-conical hole. Having biasing means for biasing the embossing pin against the cavity, rotating the frustoconical pin,
An injection molding die, wherein the embossing pin is advanced and retracted with respect to the cavity by being advanced and retracted with respect to the truncated conical hole.