JPS5884740A - Synthetic resin molding die - Google Patents

Abstract

PURPOSE:To obtain a molding die capable of providing undercuts on both sides in the direction rectangular to the opening and closing direction of the die by a method wherein there are provided a pair of slide cores of which the outer core comes in and out by angular pin of the fixed mold and the inner core comes in and out by the angular rod synchronizing with the molded product extruding mechanism as the molding die opens and closes. CONSTITUTION:A pair of inner and outer slide cores 3, 4 are provided on a movable force 2 in order to form undercuts C1, C2 on both sides in the direction rectangular to the opening and closing direction of the force. The outer slide core 4 comes in and out by the angular pin 5 fixed to the fixed force 1 according to opening and closing of the force. The inner slide core 3 comes in and out by an angular rod 7 synchronizing to the molded product extruding mechanisms 8, 9, 10. The figure shows the forces 1, 2 which have been closed. The inner and outer slide cores 3, 4 are butted by the action of the angular rod 7, the angular pin 5. The respective backs are held by slopes 31, 6 to form the cavity 12 of the undercuts.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold for injection molding and transfer molding of 9 synthetic resin.

In the above mold, as shown in Figure '#15, there is a metal undercut (@1)01 at -VB of the finished product A perpendicular to the closing direction.
・When forming C2, use a slide core in the mold on the moving side or the -leg side.

When making an undercut c1 on the outer periphery of the molded product,
Angular pins attached to the entire mating area allow the slide core to be easily moved in and out as the mold is opened and closed.

However, when making an undercut C2 on the inner circumference of a molded product, it is not possible to move the slide core with the angular pin of the mating mold, so it is necessary to move the slide core by a rack and pinion ridge linked to the opening and closing of the mold or by a hydraulic cylinder. Move the slide core to φ.

However, if the slide core is driven by a self-punch pinion mechanism or a hydraulic cylinder, the structure of the mold will be complicated, the design will be spaced apart, and the mold cost will be high.

The present invention solves the problem of the smoke point of the conventional tuna mold. i! The purpose is to provide.

Below, a detailed drawing of an example of this %-light mold will be explained. 1
is the fixed side gold amount, 2 is the moving side gold certificate, and its transfer Whf411
A pair of inner and outer slide cores 6114 are provided at predetermined positions on the metal plate 2 for forming undercuts C1@C2 on both sides in a direction perpendicular to the opening and closing directions of the pans 1 and 2.

The stationary mold IVc has an angular pin 5 and a ring 6 that act on the outer slide core 4.

A transfer 111N mold 2vc angular rod 7 is attached so as to be movable in the axial direction VC, and one end of the feeder rod 7 is connected to the inner slide core 6 and the other end is connected to the ejecting plate 8. A cutout bin 9 is attached to the protrusion plate 8. 10 is attached with an ejector rod.

(c) The surface opposite to the m-plane of the side slide core 6, that is, the inner surface 61, is diagonally oriented to give the core 6 a gold-plated shape. It is in contact with 2.

Since the undercuts C1 and C2 are located away from the main body of the molded product, the outer slide core 4 is supported by the tunnel-shaped guide groove 11 formed in the excitation side mold 2.

FIG. 1 shows the mold 1 middle 2 closed, and the inner and outer slide cores 6 and 4 are butted against each other by the action of the angular rod 7 and the angular pin 50, respectively, and the back surfaces of each are pressed against the slope 61 and the angular pin 50, respectively. The undercut cavity 12 is formed by being pressed by the holder 6, and in this state, molten resin is injected from the gate 16 into the cavity 14@12.

FIG. 6 shows a state in which the movable mold 2 has returned and the mold has opened, and the outer slide core 4, which has been released from the restraint by the angular pin 5, moves outward until it hits the stopper 16vc due to the action of the spring 150, and the outer slide core 4 moves outward until it hits the stopper 16vc. Move away from the cut portion C1.

Figure 4 shows that the mold 2 on the m side is further temporarily retracted and the ejecting rod 1
0 acts on the ejector &8, and the molded product A is separated from the mold by the ejector pin 9.

At this time, as the f5 arrow board 8 moves forward, the inner slide core 6 is pushed out of the moth 111I gold silkworm 2 via the angular rod 7, and the inner undercut portion C2
The molded product A can be taken out by separating it from the mold.

The above entry and exit strokes of the inner and outer slide cores 6@4 are:
Angular rod 7 and angular pin 5 inclination angle and #
Increases with excitation stroke.

As described above, in the molding die of the present invention, in order to form undercuts C1 and C2 on both sides of the mold 1 and 2 in the direction perpendicular to the opening/closing direction, a pair of inner and outer slide cores 6 and 6 are provided on the movable side metal part 2.
4, the outer slide core 4 is attached to the angular pin 5 attached to the stationary mold 1 in the same body as the conventional device.
The inner slide core 6 moves in and out according to the opening and closing of the angular rod 7, which moves in response to the opening and closing of the inner slide core 6.
Since VC'#4 was constructed so that it can be entered and exited by Vc, the inner slide core, which was previously operated by a rack and pinion + A structure linked to opening/closing VC or a hydraulic cylinder, can be entered and exited.

The luck of the molded product extrusion mechanism that is always included in molds 1 and 2! gl
By using gold, the construction of the mold becomes simpler, and the operation of the slide core becomes more precise.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional front view of the uninvented molded metal mold when it is narrowed, Figure 2
The figure is a longitudinal section of the outer slide core 114!1 side view, Figure 6.
Figure 4 is a vertical cross-sectional front view when opening the mold and extruding the molded product, Figure 5
The figure is a vertical and diagonal view of the molded product. 1 is a stationary side mold, 2 is a moving side mold, 6 is an inner slide core, 4 is an outer slide core, 5 is an angular pin, 6 is a hou, 7 is an angular rod, 8 bones 9 @ 10 are paper shaped product extrusion - Structure. Patent applicant: Honda Engineering Co., Ltd.
1) Honda Motor Co., Ltd.
(Figure 1, Figure 3, Figure 5)

Claims (1)

[Claims] A pair of inner and outer slide cores for forming undercuts on both sides in the direction perpendicular to the opening/closing direction of the tit mold are installed in the transfer wJ side metal shop, and the outer slide core is υ by an angular pin attached to the fixed side metal. goes in and out according to the opening and closing of the mold,
A synthetic resin molding die characterized in that the inner slide core moves in and out through an angular plug that is linked to a molded product extrusion mechanism.