JPS5828827Y2 - mold for molding - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a molding die used for molding a molded product having a rib having holes inside the outer wall.

In molded products such as synthetic resin containers or frames,
As shown in FIG. 1, a rib C is provided on the inside of the outer wall of the molded product a, slightly spaced apart from the outer wall of the molded product a, and a hole d and a bottom e are provided in the direction perpendicular to the rib C. Some are provided with a protrusion f.

In such a specially shaped molded product a, the hole d becomes an undercut, making it impossible to release the mold in one direction.

Therefore, in the past, after taking out the molded product a,
A method has been adopted in which holes d are bored in the rib C by post-processing, but if there are a large number of holes d, the work is very troublesome and there is a risk of damaging the molded product a.

This idea was made with attention to the above circumstances, and its purpose is to easily extract the core inserted into the hole of the rib from the outside and release it from the mold, and to apply unreasonable force to the molded product. The object of the present invention is to provide a molding die that can simplify the molding work.

This invention will be explained below based on an embodiment shown in the drawings.

In FIG. 2, 1 is a fixed mold, and 2 is a movable mold, which constitute a molding die for molding the molded product a shown in FIG.

The fixed mold 1 has a mold surface for molding the bottom and outer surfaces of the molded product a, and a gate 3 communicating with this mold surface is provided.

Further, the movable mold 2 is formed with a mold surface for molding the inner surface of the molded product a.

Furthermore, the fixed mold 1 corresponding to the bottom surface of the molded product a
A convex portion 4 is provided on the mold surface of the movable mold 2.
A recess 5 facing the projection 4 is provided on the mold surface, so that a projection f is formed at the bottom of the molded product a.

Furthermore, grooves 6 for forming ribs C are carved in the movable mold 2 on the inner side slightly apart from the outer wall of the molded product a.

Further, the movable mold 2 facing the groove 6 is provided with a cavity 7 bent in an inverted shape, one end of which faces the groove 6, and the other end facing the movable mold 2. It passes through and communicates with the outside.

A slider 9 having a cylindrical core 8 at its tip is housed in the horizontal portion 7a of the cavity 7 so as to be slidable in the direction of the arrow. It passes through the vicinity in a direction perpendicular to this.

A hole d perpendicular to the rib C is formed in the rib C.

Furthermore, a sliding surface 11 consisting of an inclined surface is provided at the rear end of the slider 9, and an engaging groove 12 with an opening narrower than the inside, that is, a T-shaped cross section, is carved into the sliding surface 11. It is set up.

Further, an actuator 13 that is slidable in the direction of the arrow is housed in the vertical portion 7b of the hollow portion 7, and a sliding surface 14 formed of an inclined surface that joins to the sliding surface 11 of the movable element 9 is provided at the tip of the actuator 13.
The sliding surface 14 is provided with a projection 15 whose head that engages with the engagement groove 12 is wider than the opening of the retention groove 12, that is, has a T-shaped cross section. 12 and protrusion 15
This forms an inclined retaining portion.

As the actuator 13 moves up and down, the mover 9 moves in a direction perpendicular thereto.

Further, the rear end of the actuator 13 is connected to a slide rod 17 of a cylinder 16 fixed to the movable mold 2.

Next, the operation of the above embodiment will be explained.

When the fixed mold 1 and the movable mold 2 are closed and the movable member 9 is advanced to project the core 8 into the groove 6, the molten synthetic resin material is injected from the gate 3. is filled into the gap.

After the synthetic resin material filled in the gap has solidified, first actuate the cylinder 16 and move the actuator 13 backward via the slide rod 17.
The slider 9 having the engagement groove 12 engaged with the slider 9 gradually retreats as the sliding surfaces 11 and 14 come into sliding contact.

Therefore, the core 8 provided at the tip of the mover 9 is pulled out from the rib C, and a hole d is formed in the rib C.

After the core 8 retreats and is completely pulled out from the hole d of the rib C, when the movable mold 2 is moved in the direction away from the fixed mold 1, the mold surface of the movable mold 2 becomes the inner peripheral surface of the molded product a. At the same time, the outer peripheral surface of the molded product a is separated from the mold surface of the fixed mold 1.

Therefore, the fixed mold 1, the movable mold 2, and the core 8 produce a molded product a having ribs C with holes d.

In the above embodiment, molding of a molded product a having one hole d in the rib C was described, but in the case where there are multiple holes, a plurality of cores 8 may be provided protruding from the mover 9. All you have to do is
Furthermore, by regulating the length of the core 8, it is possible to form a hole with a bottom that does not penetrate the rib C.

As explained above, this invention is applied to a mold for molding a molded product having a rib with a hole perpendicular to the direction of movement of the movable mold on the inside of the outer wall. Since the mover has a core to be removed and the mover is moved and pulled out from the hole in the rib before opening the mold,
It can be easily molded without applying excessive force to the molded product.

Furthermore, since the core inserted into the hole in the rib is moved forward and backward by an actuator that interlocks with the cylinder, it can be easily operated from the outside.

Therefore, it is possible to achieve the effect of facilitating the molding operation and the mold manufacturing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a molded product, FIG. 2 is a longitudinal sectional view of a molding die showing an embodiment of this invention, and FIG. 3 is a longitudinal sectional view for explaining the function. 1...Fixed mold, 2...Moveable mold, 7
...Cavity, 8...Core, 9...
...Mover, 13... Actuator, 16...
・Cylinder, a... Molded product, b... Outer wall, C... Rib, d... Hole, 11.
...Sliding surface, 12...Engagement groove, 15...
... protrusion.

Claims (1)

[Scope of utility model registration request] The molded product is composed of a fixed mold and a movable mold that moves toward and away from the fixed mold, and has a rib on the inside of the outer wall with a hole perpendicular to the moving direction of the movable mold. In the molding mold for molding, a bent cavity part provided in the movable mold, one end facing a hole provided in a rib of the molded product, and the other end passing through the movable mold and facing the outside; A mover that is slidably provided within the cavity and has a core at its tip that is inserted into the hole of the rib; an actuator that is also slidably provided within the cavity and moves in a direction perpendicular to the mover; and this actuator. A locking groove is provided along the sliding direction on the sliding surface of the slider and the slider, and one side has a locking groove whose opening is narrower than the inside, and the other side has a protrusion whose head is wider than the opening of the locking groove. A sloped retaining portion is provided on the outside of the movable mold, and the core of the movable element is pulled out from the hole via an actuator before the mold is opened. A molding die characterized in that it is equipped with a cylinder for ejecting.