JPH0544517U - Injection mold - Google Patents

Abstract

(57) [Summary] [Object] To provide an injection molding die in which the slide core 50 is positioned by moving the movable side mold plate 20 toward the fixed side mold plate 10. [Structure] A pressing plate 80 is provided on a locking block 70 provided on the side opposite to the cavity side of a slide core 50 that slides along an angular pin 60. When the slide core 50 is moved so as to approach the fixed-side template 10, the pressing plate 80 abuts the inclined surface 53 of the slide core 50,
The push spring 82 pushes the slide core 50 toward the cavity side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an injection molding die having a slide core.

[0002]

[Prior Art]

 In the injection molding die used for molding synthetic resin products, the fixed side mold plate and the movable side mold plate are butted against each other to form a cavity for injecting molten resin between the two mold plates. There is. Nests, slide cores, and the like are attached to these template plates depending on the shape of the product to be molded.

When molding a synthetic resin product having a shape having an uneven portion, a mold for injection molding shown in FIG. 3 is usually used. This injection molding die has a fixed-side mold plate 100 and a movable-side mold plate 120 that is movable with respect to the fixed-side mold plate. A slide core 150, which is horizontally slidable, is provided between the movable side mold plate 120 and the fixed side mold plate so as to be locked to the insert 130. A concave-convex undercut surface 151 is formed on the side surface of the slide core 150 on the insert 130 side, and the concave-convex undercut portion is formed by the fixed-side template 100, the insert 130 and the slide core 150. A cavity 140 is formed having a. An angular pin 160 extending toward the movable side mold plate 120 side is attached to the fixed side mold plate 100 in an inclined state to move the movable side mold plate 120 in a direction away from the fixed side mold plate 100. By doing so, the slide core 150 slides along the angular pin 160, and as shown by an arrow A, slides away from the insert 130.

An inclined surface 153 that is inclined in the same direction as the angular pin 160 is formed on the side surface of the slide core 150 opposite to the side surface on the cavity 140 side. Further, the fixed-side template 100 is provided with a locking block 170 having an inclined surface 171 that is in close contact with the inclined surface 153. After the slide block 150 is locked to the insert 130, the locking block 170 is fixed to a predetermined position of the fixed-side template 100 with a bolt 180, so that the inclined surface 171 of the locking block 170 slides the slide core. The slide core 150 is fixed by pressing the inclined surface 153 of the 150.

[0005]

[Problems to be solved by the device]

 In such an injection molding die, the slide core 150, the locking block 170, and the like are precisely formed so that the slide core 150 can be securely fixed by the locking block 170 while being locked at a predetermined position of the insert 130. However, there is a problem that the manufacturing cost is required. In addition, there is also a problem that the position of the locking block 170 is complicated to adjust in order to accurately position the slide core 150 during the assembly work of the mold.

The present invention solves such a problem, and an object thereof is to provide an injection mold in which a slide core for forming an undercut portion can be adjusted very easily. .

[0007]

[Means for Solving the Problems]

 The mold for injection molding of the present invention comprises a fixed-side mold plate, a movable-side mold plate arranged so as to be movable toward and away from the fixed mold plate, and the fixed-side mold plate. A cavity is formed between the movable mold plate and the movable mold plate, and the movable mold plate moves away from the fixed mold plate as the movable mold plate moves away from the fixed mold plate. A slide core that is moved with the pressing plate that abuts on the side surface of the slide core opposite to the cavity side as the movable mold plate moves toward the fixed mold plate; The plate comprises a biasing means for biasing the slide core toward the cavity side, whereby the above object is achieved.

[0008]

[Action]

 In the injection molding die of the present invention, the pressing plate abuts on the slide core by moving the movable side mold plate so as to approach the fixed side mold plate. Since the pressing plate presses the slide core toward the cavity by the urging means, the slide core is positioned so that a predetermined cavity is formed.

[0009]

【Example】

 An embodiment of the present invention will be described below. The injection molding die of the present invention has a fixed side mold plate 10 and a movable side mold plate 20, as shown in FIG. The movable-side template 20 is movable in a direction toward and away from the fixed-side template 10. An insert 30 is attached to the movable-side template 20. The insert 30 has a base plate portion 32 attached to the movable side mold plate 20 and a protruding portion 31 protruding from the base plate portion 32 toward the fixed side mold plate 10. A slide core 50 is provided between the fixed-side mold plate 10 and the movable-side mold plate 20 so as to be locked by the base plate portion 32 of the insert 30. The slide core 50 slides between the fixed-side mold plate 10 and the movable-side mold plate 20 so as to approach and separate from the insert 30. An uneven undercut surface 51 is formed on one side surface of the slide core 50 facing the side surface of the protruding portion 31 of the insert 30. Then, when the slide core 50 is brought into a predetermined state in which it is locked to the base plate portion 32 of the insert 30, between the side surface of the protruding portion 31 of the insert 30 and the side surface of the slide core 50 on which the undercut surface 51 is formed. A cavity 40 having a predetermined shape is formed between the protruding portion 31 of the insert 30 and the fixed-side template 10 facing the protruding portion 31. A synthetic resin having a predetermined shape is manufactured by injecting the molten synthetic resin into the cavity 40 and curing it.

An angular pin 60 extending toward the movable-side mold plate 20 is attached to the fixed-side mold plate 10 in a state in which the tip end is inclined so as to be separated from the insert 20, and the angular pin 60 is The slide core 50 is slidably inserted. Therefore, by moving the movable side mold plate 20 in the direction away from the fixed side mold plate 10, the slide core 50 is slid in the direction away from the insert 30 as shown by arrow A.

An inclined surface 53 that is inclined in the same direction as the angular pin 60 is formed on a side surface of the slide core 50 opposite to the insert 30 side. Further, the fixed template 10 is provided with a locking block 70 having an inclined surface 71 facing the inclined surface 53. As shown in FIG. 1, the inclined surface 71 of the locking block 70 is provided with a recess 72 that is cut into a flat plate shape, and a flat plate-shaped pressing plate 80 is slidably fitted into the recessed portion 72. is doing. The pressing plate 80 is pressed toward the inclined surface of the slide core 50 by a pressing spring 82 embedded in the locking block 70. The pressing plate 80 is held by a plurality of bolts 81 so that the pressing plate 80 can slide by an amount indicated by C in FIG. The spring force of the push spring 80 is set so that the slide core 50 does not slide in the arrow A direction even if the slide core 50 is pressed by the molten resin filled in the cavity 40.

The injection mold having such a configuration is assembled by moving the movable mold plate 20 provided with the insert 30 and the slide core 50 toward the fixed mold plate 10. When the movable side mold plate 20 is moved toward the fixed side mold plate 10, the slide core 50 into which the angular pin 60 is inserted slides along the angular pin 60 toward the nest 30. The inclined pressing plate 80 of the locking block 70 is slidably brought into contact with the inclined surface 53 of the slide core 50. Then, when the slide core 50 comes into contact with the fixed-side mold plate 10, the pressing plate 80 pressed by the pressing spring 82 presses the inclined surface 53 of the slide core 50 toward the insert 30. Therefore, the slide core 50 is fixed while being locked to the base plate portion 32 of the insert 30. As a result, the slide core 50, the insert 30, and the fixed-side template 10 reliably form the cavity 40 having a predetermined shape without finely adjusting the mounting position of the locking block 70 to the fixed-side template 10. .

By injecting the molten resin into the cavity 40 in the injection-molding die thus assembled and curing the resin, a molded article having the undercut portion 41 is manufactured. At this time, even if the slide core 50 is pressed in the direction indicated by the arrow A by the molten resin filled in the cavity 40, the slide core 50 is strongly pressed in the direction opposite to the arrow A by the pressing spring 82. As a result, the slide core 50 does not move. As a result, a molded product having a predetermined shape is reliably formed.

When the molded product is manufactured in this way, the movable side mold plate 20 is moved in a direction away from the fixed side mold plate 10, and the slide core 50 is moved along the angular pin 60 in the inclined state. By sliding, the slide core 50 slides in the direction of arrow A, and the undercut surface 51 of the slide core 50 moves so as to avoid the undercut portion in the molded product. Then, by removing the movable side mold plate 20 from the fixed side mold plate 10, the insert 30 and the fixed side mold plate 10 are separated, and the molded product is taken out.

It should be noted that the present invention is not limited to the above embodiment, and instead of the compression coil spring 82, for example, another elastic member such as rubber may be used.

[0016]

[Effect of the device]

 In the injection molding die of the present invention, by moving the movable side mold plate so as to approach the fixed side mold plate as described above, the pressing plate comes into contact with the slide core, and the slide core is biased. The slide core can be positioned very easily because it is positioned by being pressed toward the cavity by the pressing plate biased by the means.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of an injection molding die of the present invention.

FIG. 2 is a vertical sectional view showing an example of an injection molding die.

FIG. 3 is a vertical sectional view showing a conventional injection molding die.

[Explanation of symbols]

 10 Fixed-side template 20 Movable-side template 30 Nesting 40 Cavity 50 Slide core 51 Undercut surface 53 Inclined surface 60 Angular pin 70 Locking block 80 Pressing plate 82 Push spring

Claims (1)

[Scope of utility model registration request] 1. A fixed-side template, a movable-side template arranged so as to be movable toward and away from the fixed-template, the fixed-side template and the movable-side template. And a slide core that is disposed so as to form a cavity between the movable side template and the movable core template, and the movable core template is moved in a direction away from the fixed side template in a direction away from the fixed side template. A pressing plate that abuts on a side surface of the slide core opposite to the cavity side as the movable side mold plate moves toward the fixed side mold plate; and the pressing plate moves the slide core to the cavity side. And a means for urging it so as to press the mold for injection molding.