JP3007444U - Injection mold - Google Patents

Abstract

(57) [Summary] [Purpose] A driving means for releasing the undercut portion can be installed on the outer surface of the die. [Structure] After injecting the resin into the molded product 1, before starting the mold opening, the hydraulic cylinder 47 is driven and the cam rod 45 is withdrawn from the second slide core 44. As the cam rod 45 is pulled out from the second slide core 44, the second
The slide core 44 causes the first slide core 42 to perform a sliding operation in a direction of separating from the undercut portion 11 of the molded product 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a release structure of an undercut molding part in an injection molding die.

[0002]

[Prior art]

 Conventionally, as a mold structure for releasing the undercut molding part, for example, an injection mold structure described in Japanese Utility Model Laid-Open No. 61-135615 can be cited. In this injection molding die structure, a slide core having an undercut is provided with an inclined guide hole that is inclined in a direction in which it recedes from the cavity, and an inclined guide rod is fitted into the hole. Then, the inclined guide rod is advanced and retracted by a driving means that moves forward and backward through a fixed mold in a direction orthogonal to the core hole of the slide core, and the slide core is released from the undercut molding part.

[0003]

[Problems to be solved by the device]

 In the injection mold structure described in Japanese Utility Model Laid-Open No. 61-135615, it was necessary to provide a driving means for operating the inclined guide rod inside the mold because of the structure of a general mold. Therefore, when a problem occurs in the driving means, it is necessary to remove the mold from the injection molding machine and perform repair work, which may lead to a decrease in operating rate. In consideration of the above points, the present invention aims to provide an injection molding die in which the driving means is arranged outside the die, and the driving means can be easily repaired.

[0004]

[Means for Solving the Problems]

 Therefore, in the injection mold of the present invention, 1. An insert having a first slide core that forms an undercut molding part in a molded product constitutes a part of a movable die, and is fitted with the first slide core to undercut the first slide core. A second slide core that slides in the direction to remove the second slide core, a cam rod that slides the second slide core forward and backward from the first slide core, and a hydraulic slide that slides the cam rod. The binder and the movable type are provided. In Section 2.1, the insert is attached to the front of the movable die so as to form the core. In Section 3.2, install the first slide core inside the core part, slide it in the direction perpendicular to the mold opening direction, project from the side surface of the core part in the advanced position, and inside the core part in the retracted position. Make it retract. In Section 4.3, the second slide core is slid in the mold opening direction, and the first slide core is advanced or retracted in accordance with this slide. In Section 5.4, slide the cam rod in the direction perpendicular to the mold opening direction. In Section 6.5, extend the end of the cam rod close to the side of the moving mold, where it is connected to the rod of the hydraulic cylinder. In paragraph 7.1, a shaft is connected to the second slide core, and a compression coil spring is provided which is used for this shaft and biases the second slide core in the backward direction of the first slide core. In Section 8.7, after the cam rod is pulled out from the second slide core, the second slide core is held in the same position by the biasing force of the compression coil spring.

[0005]

[Action]

 After injecting the resin into the molded product and before starting the mold opening, the hydraulic cylinder is driven to move the cam rod out of the second slide core. As the cam rod is pulled out from the second slide core, the second slide core causes the first slide core to perform a sliding operation in a direction of separating from the undercut portion of the molded product. This allows the molded product to be released from the core.

[0006]

【Example】

 An embodiment will be described with reference to the drawings. In the figure, 2 is a fixed type and 3 is a movable type. Reference numeral 4 denotes a core portion configured by a nesting member 41 attached to the front surfaces of the fixed mold 2 and the movable mold 3, a first slide core 42 described later, and a part of a guide block 43. 1 is a molded product formed by the fixed mold 2, the movable mold 3, and the core portion 4.

The first slide core 42 is fitted inside the insert 41 so as to be slidable in the direction orthogonal to the mold opening direction, and is an undercut for forming the undercut portion 11 of the molded product 1 on one end surface. It has a molding part 421. A first slide hole 422 is formed in the first slide core 42 so as to be inclined with respect to the mold opening direction, and a cam portion 440 of a second slide core 44 described later is slidably fitted therein. The second slide core 44 has a cam portion 440 at one end and a second slide hole 441 penetrating the other end side at an angle with respect to a direction orthogonal to the mold opening direction, and is orthogonal to the first slide core 42. Place it. When the cam portion 440 is pulled out of the first slide hole 422, the cam portion 440 moves the undercut molding portion 421 of the first slide core 42 away from the undercut portion 11 of the molded product 1 in accordance with the pulling amount. 42 plays a role of giving displacement. Reference numeral 411 is a recess in the insert 41 that opens into the slide space of the first slide core 42 and receives the tip of the cam portion 440 of the second slide core. The recessed portion 411 restricts the end of the extrusion stroke of the second slide core 44 to a fixed position, and also restricts the movement of the first slide core 42 that tends to displace from the molded product 1 at the end position. It is a thing.

Reference numeral 45 denotes a cam rod that is arranged in parallel with the first slide core 42 and in a direction orthogonal to the second slide core 44. The cam portion 450 provided at the tip of the cam rod 450 is the second rod core of the second slide core 44. The slide hole 441 is slidably fitted. When the cam portion 450 is pulled out from the second slide hole 441, the cam portion 450 displaces the second slide core 44 in the direction of pulling out the cam portion 440 of the second slide core 44 from the first slide hole 422 according to the pulling amount. Play a role. The guide block 43 is arranged in the movable die 3 so as to contact the slide space of the first slide core 42. The guide block 43 guides the slide of the first slide core 42 on its upper surface, and guides the slide of the second slide core 44 with a guide hole 431 parallel to the mold opening direction which opens in this guide surface. The slide of the cam rod 45 is guided by the orthogonal guide holes 432. At the opening of the guide hole 431 that contacts the movable die 3, the end of the second slide core 44 contacts the movable die 3, so the end of the retracting stroke of the second slide core 44 is restricted to a fixed position. Become. Reference numeral 460 is a through hole that leads from the side surface of the movable die 3 to the guide hole 432 of the guide block 43.

Reference numeral 46 denotes a cylinder rod of a hydraulic cylinder 47 attached to a side surface of the movable die 3 toward the inside of the movable die, and a tip portion thereof is connected to the cam rod 45 through a through hole 460. . Thus, by the forward movement of the cylinder rod 46, the cam rod 45 slides in the direction orthogonal to the mold opening direction, the cam portion 450 displaces the second slide core 44 in the mold opening direction, and the cam portion 440 moves the first portion. The slide core 42 is displaced to the molding position or the releasing position.

Reference numeral 443 is a slide hole having a step opening from the back surface of the movable die 3 to the guide hole 431, and the shaft 442 is inserted into the small diameter portion thereof. The shaft 442 has a tip portion screwed to the end portion of the second slide core 44, and a compression coil spring 444 is fitted between a flange portion provided at the other end and a step portion of the slide hole 443. The compression coil spring 444 always urges the second slide core 44 in the direction of pulling it out of the first slide hole 422, and when the cam portion 450 of the cam rod 45 comes out of the second slide hole 441, the second slide core 444 slides. It serves to hold the core 44 in place.

Reference numeral 462 denotes a detent pin embedded in the movable die 3, the tip of which comes out into the through hole 460 of the movable die 3 and is fitted into the key groove 461 formed in the cylinder rod 46, The rotation of the rod 46 around the axial direction is restricted.

The operation of the above mold is as follows. After the molten resin is solidified and immediately before the mold is opened, the hydraulic cylinder 47 is driven to draw the cylinder rod 46. The cam rod 45 interlocks with the movement of the cylinder rod 46 and pulls out the cam portion 450 from the second slide hole 441. The cam portion 450 displaces the second slide core 44 in a direction in which the cam portion 440 of the second slide core 44 is pulled out from the first slide hole 422 according to the pulling amount. Due to the displacement amount of the second slide core 44, the cam portion 440 displaces the first slide core 42 in the direction in which the undercut molding portion 421 of the first slide core 42 is separated from the undercut molding portion 11 of the molded product 1. It will be done.

After the cam portion 450 has slipped out of the second slide hole 441, the compression coil spring 444 holds the second slide core 44 in contact with the movable die in contact with the guide hole 431, which is the end of the slide stroke. (State of FIG. 2). After this, the mold is opened.

At the time of molding, after the mold is closed, the hydraulic cylinder 47 is driven and the cylinder rod 46 is projected. Accordingly, the cam portion 450 of the cam rod 45 is pushed into the second slide hole 441, and the cam portion 440 of the second slide core 44 is pushed into the first slide hole 422, contrary to the above-described mold opening. 1 The slide core 42 is displaced to the molding position, and the original state in which injection is possible is performed.

[0015]

[Effect of device]

 According to the present invention, since the driving means for releasing the undercut portion can be installed on the outer surface of the mold, the driving means can be easily repaired.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an injection mold which is an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing different operating states of the injection mold according to the embodiment of the present invention.

[Explanation of symbols]

 1 Molded Product 11 Undercut Part 3 Moving Type 4 Core Part 41 Nest 42 First Slide Core 421 Undercut Molded Part 44 Second Slide Core 442 Shaft 444 Compression Coil Spring 45 Cam Rod 46 Cylinder Rod 47 Hydraulic Cylinder

Claims (8)

[Scope of utility model registration request] 1. An injection mold comprising the following elements. a. Fixed type. b. Mobile type. c. A first slide core that forms an undercut molding portion in a molded product. d. A nest forming a part of the movable die and having the first slide core. e. A second slide core which is provided in the movable die, is fitted with the first slide core, and slides the first slide core in a direction of removing the first slide core from the undercut molding portion. f. A cam rod that is provided in the movable die, fits with the second slide core, and moves the second slide core forward and backward with respect to the first slide core by sliding itself. g. A hydraulic cylinder that is provided in the movable mold and slides the cam rod. 2. The injection mold according to claim 1, wherein the insert is attached in a state of protruding to the front of the movable die to form a core portion. 3. The first slide core is installed inside the core part, slides in a direction perpendicular to the mold opening direction, projects from the side surface of the core part in the advanced position, and retracts into the core part in the retracted position. The injection mold according to claim 2, which is characterized in that. 4. The injection molding die according to claim 3, wherein the second slide core slides in the mold opening direction, and the first slide core is advanced or retracted in accordance with the slide. 5. The injection mold according to claim 4, wherein the cam rod slides in a direction perpendicular to the mold opening direction. 6. The injection mold according to claim 5, wherein the end of the cam rod extends close to the side surface of the movable die and is connected to the rod of the hydraulic cylinder there. 7. A shaft connected to the second slide core, and a compression coil spring which acts on the shaft and urges the second slide core in the backward direction of the first slide core are provided. Injection mold. 8. The injection mold according to claim 7, wherein after the cam rod comes out of the second slide core, the second slide core is held in the same position by the urging force of the compression coil spring.