JPS591771Y2 - mold for molding - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a molding die that prevents a slide core from falling due to its own weight when the mold is opened in a molding method such as injection molding or compression molding.

Conventional methods for providing this type of function to molding molds include simply lengthening the finger pins so that the slide core does not fall out from the finger pins even when the mold is split, or adding one end of the spring to the mold. A method in which the other end is fixed to the slide core, and when the slide core finishes sliding against the elastic force of the spring, the restoring force of the spring prevents the slide core from falling (hereinafter referred to as spring). Alternatively, a recess into which a steel ball can be inserted is provided on the sliding surface of the slide core of the mold, and a steel ball biased by a spring is inserted into the recess, while a steel ball is inserted into the slide core. A method in which a locking recess that can be locked by a ball made of steel is provided, and when the slide core slides on the mold surface, the steel ball protrudes into the locking recess by the restoring force of a spring and locks the slide core. (hereinafter referred to as the ball check method) and other methods have been adopted.

However, with the method of increasing the length of the finger pins, it is necessary to increase the size of the mold as a whole, and therefore the size of the molding machine must also be increased.Also, with the spring method, the size of the mold as a whole must be increased, or in particular, The structure is naturally complicated, and it takes time to maintain and manage the spring strength during long-term use.Furthermore, even if the ball check method is adopted, the spring has the same disadvantages as the spring method, and the slide core is made of metal. Although it slides along the sliding groove or sliding protrusion provided in the mold, it tends to meander considerably and does not engage the ball at the designed position, and furthermore, the slide core Since both the ball and the ball are normally made of steel, the tube has various drawbacks such as severe wear caused by the impact when they are locked together.

The molding mold of the present invention was developed to eliminate the drawbacks of conventional products with an inclined surface. A locking protrusion capable of locking the slide core when the mold is opened is provided on one of the slide core sliding surface of the mold and the slide core in a direction substantially perpendicular to the moving direction of the slide core, and on the other side. The invention resides in a molding die characterized in that an elastic body having a locking recess into which the locking protrusion can be fitted is attached with the opening of the locking recess facing downward.

Next, an embodiment of the molding die of the present invention will be described in detail with reference to the drawings.

Each of the drawings shows an embodiment of the product of the present invention, and in FIGS. 1 and 2, a represents a movable mold, b represents a fixed mold, and movable mold a represents the movable mold. It is split in the direction of the arrow in Figure 2.

A mold cavity (not shown) is formed by the movable mold plate 1, the fixed mold plate 2, and the upper end surface (not shown) of the slide core 3 in FIGS. 1 to 3. .

The movable mold a is provided with a sliding groove 5 along the parting line with the slide core 3 into which the sliding protrusion 4 of the slide core 3 can be inserted and slid. As will be described later, on one of the sliding surfaces 6, a locking protrusion 7 consisting of a locking pin capable of locking the slide core 3 upon completion of mold opening is fixed perpendicularly to the sliding surface 6. .

The slide core 3 is provided with a notch 16 in the shape of a rectangular parallelepiped extending from the bottom to one side, and an elastic body 8 made of urethane rubber is fixed to the notch 16 by a bolt (not shown).

To explain the shape of the elastic body 8 with reference to FIG. 4, a locking recess 9 is provided upward from the bottom surface of the rectangular parallelepiped, and the cross section of the locking recess 9 is shaped like a keyhole and opens downward.
The upper end of a portion 11 extending parallel to the upper end of the chamfered portion 10, which is narrower upward from the center of the bottom surface, is connected to an arcuate portion 12 having approximately the same diameter as the locking protrusion 7. The width of the parallel portion 11 is slightly smaller than the diameter of the locking projection 7.

The material of the elastic body 8 is not limited to urethane rubber, and synthetic resin foam or the like may also be used.

On the other hand, as shown in FIGS. 1 and 2, finger pins 13 are provided on the stationary mold side to protrude obliquely downward toward the movable mold a, and the finger pins 13 slide when the mold is closed. The slide core 3 is inserted into a pin insertion hole 14 drilled in the core 3 and a pin insertion hole 15 drilled in the movable mold a, and when the mold is split and the movable mold a moves, the slide core 3 is guided by the finger pins 13 and slid in the sliding groove 5 bored in the movable mold a, thereby moving downward.

In this case, the meaning of moving downward includes moving diagonally downward.

In the mold of the present invention, the slide core 3 may be provided on the movable side mold a, the fixed side mold, or both. However, if it is provided on the fixed side mold, the slide core 3 may also be provided when the mold is split open. Since the molded product body is left attached to an unnecessary molded product such as a spool, it is necessary to take appropriate mold release means.

Next, the manner of use of the molding die of the present invention will be explained based on the above embodiments.

As shown in FIG. 1, the movable mold a is closed to the fixed mold, and molten resin is injected into the mold cavity (none of which is shown) through an injection nozzle.

Next, when the movable mold a is moved laterally and split,
The slide core 3 has a finger pin 13 and a movable mold a.
It is slid diagonally downward along the sliding groove 5 bored in the sliding surface 6, and gradually approaches the locking protrusion 7 projecting from the sliding surface 6.

Next, when the opening of the mold approaches the end, the locking protrusion 7 passes through the chamfered part 10 of the elastic body 8 attached to the slide core 3, and fits into the parallel part 11 of the elastic body 8 so as to spread it apart, and then The core 3 is fitted to the arcuate portion 12 to lock the core 3 without applying an impact to the slide core 3, thereby preventing the slide core 3 from falling.

In this example, an example using finger pins was described among the methods of sliding the slide core using the mold opening mechanism, but the mold can be moved by using a hydraulic cylinder, geared motor, etc. The present invention can be implemented even in a molding die in which a slide core is slid without using a splitting mechanism.

Since the molding mold of the present invention has an inclined structure, there is no need to complicate the structure of the mold or make the mold larger than necessary, and the slide core can be locked without impacting it. This makes it possible to prevent the mold from falling, making maintenance management of the mold easier.

[Brief explanation of drawings]

The drawings show an embodiment of the mold according to the present invention, and FIG. 1 is a partially cutaway sectional view in the closed state, FIG. 2 is a partially cutaway sectional view in the open state, and FIG. 3 is a partially cutaway sectional view in the open state. 4 is a partially cutaway perspective view of a mold having a slide core and its sliding surface, and FIG. 4 is a perspective view of an elastic body. Brief explanation of symbols, 3...Slide core, 6.
...Sliding surface of mold, 7 ...Latching protrusion, 8
...Elastic body, 9...Latching concave portion.

Claims (1)

[Scope of utility model registration request] In a mold for opening and closing that has a slide core that can slide in the vertical direction, the slide core is locked to either the slide core sliding surface of the mold or the slide core when the mold is opened. A locking protrusion that can be fitted is provided perpendicularly to the sliding surface of the slide core, and an elastic body having a locking recess into which the locking protrusion can be inserted is arranged so that the opening of the locking recess faces downward. A molding die characterized in that it is attached to a mold.