JPH0723228Y2 - Mold for molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to improvement of a mold used for injection molding or transfer molding.

[Conventional technology]

The known mold is, as shown in FIG. 2, arranged on a core plate (1) and above the core plate (1),
A slide core (3) that is horizontally moved by an angular pin (2) and a slide core (3) fixed to the core plate (1) and having an upper end portion (4a) protruding above the core plate (1). 3) to be brought into contact with the core pin (4). (5) is a sprue, (6) is a cavity, and (7) is a movable-side template that always moves integrally with the core plate (1).

[Problems to be solved by the device]

The following problems are pointed out for the above-mentioned conventional molds. That is, when degassing operation is performed in order to prevent gas burn in the A portion of the molded product in the figure, the contact portion between the slide core (3) and the core pin (4) slides, causing mold bite or scratches. May occur and a defective product may be molded.
During the degassing operation, the mold or the mold is opened or the mold clamping force is neutralized during or after the injection so that the gas or air in the cavity (6) is moved to the core plate (1) and the slide core (3).
It is discharged to the outside through the gap between and.

[Means for Solving the Problems]

In view of the above points, the present invention has an object to solve the problems found in the above-mentioned prior art, and in order to achieve this object, a core plate and a core plate are disposed above the core plate and are arranged in a horizontal direction. A movable slide core, a movable side template disposed below the core plate and movable in a contact direction with respect to the core plate, and a movable side template fixed to the movable side template and formed on the core plate. A core pin that is inserted through the vertical hole and has its upper end protruding above the core plate to contact the slide core, and a spring that elastically biases the core plate and the movable mold plate in a direction in which they are separated from each other. And a stopper that regulates a distance between the core plate and the movable-side mold plate.

[Action]

Prior to starting the degassing operation, the core plate and the movable side mold plate are separated from each other by utilizing the elasticity of the spring, and the core pin fixed to the movable side mold plate is moved in the direction to be retracted with respect to the core plate, The core pin and the slide core are pulled away from each other, which prevents the core pin and the slide core from sliding.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings.
Fig. 1 shows the state before degassing in the left half and the state during degassing in the right half. The slide core (3) drawn in the right half slightly moves from the state before degassing to the right in the figure. is doing. Then, (1) is a core plate, (3) is a slide core which is arranged above the core plate (1), and is horizontally moved by an angular pin (2), and (7) is the core plate (1). ), Which is arranged on the lower side of the core plate (1) and is movable in the contact and separation direction with respect to the core plate (1), and (4) is fixed to the movable side mold plate (7). ), A core pin that is inserted into a vertical hole (1a) formed in (1) and has its upper end (4a) protruding above the core plate (1) to contact the slide core (3), and (5) is a sprue,
(6) is a cavity, (8) is the core plate (1)
And the movable side template (7) are interposed between the two members (1).
A spring for elastically urging (7) in a direction to separate them from each other, and (9) a bolt-shaped stopper for restricting a separation distance between the core plate (1) and the movable side mold plate (7), which is a degassing operation. Prior to starting, the core plate (1) and the movable side mold plate (7) are separated from each other by utilizing the elasticity of the spring (8) to fix the core pin (4) fixed to the movable side mold plate (7). The core pin (4) and the slide core (3) are moved away from each other with respect to the core plate (1) so that the core pin (4) and the slide core (3) are prevented from sliding. . Therefore, it is possible to prevent the occurrence of mold biting and scratches caused by sliding of both members (3) and (4), and to prevent the occurrence of defective products. The stopper (9) serves to maintain the integrity of both members (1) and (7) by limiting the distance (a) between the core plate (1) and the movable side mold plate (7) to a constant value.

[Effect of device]

As described above, in the molding die of the present invention, the core plate and the movable side mold plate are separated from each other by utilizing the elasticity of the spring and fixed to the movable side mold plate before starting the degassing operation. Since the core pin is separated from the slide pin, it is possible to prevent the slide core and the core pin from sliding, prevent mold bites and scratches, and prevent defective products. Incidentally, in the prior art, the sliding of the slide core and the core pin is a general phenomenon at the time of mold opening which is not limited to the degassing operation, and the present invention corresponds to this.

[Brief description of drawings]

FIG. 1 is a sectional view of a molding die according to an embodiment of the present invention, and FIG. 2 is a sectional view of a molding die according to a conventional example. (1) Core plate, (1a) Vertical hole (2) Angular pin, (3) Slide core (4) Core pin, (4a) Upper end, (5) Sprue (6) Cavity, (7) Movable mold plate ( 8) Spring, (9) Stopper

Claims (1)

[Scope of utility model registration request] 1. A core plate (1), a slide core (3) which is arranged above the core plate (1) and which is movable in the horizontal direction, and below the core plate (1), A movable-side mold plate (7) movable in the contacting and separating direction with respect to the core plate (1), and a vertical hole (1a formed in the core plate (1) fixed to the movable-side mold plate (7). )
A core pin (4) which is inserted into the core plate (4a) and has its upper end (4a) protruding above the core plate (1) to contact the slide core (3); A spring (8) for elastically biasing (7) in a direction of separating from each other; a stopper (9) for restricting a separation distance between the core plate (1) and the movable side mold plate (7);
A molding die characterized by having.