JPH0890612A - Submarine gate-type mold for molding resin and resin molding method - Google Patents

Abstract

PURPOSE: To release a product from a mold separately from a machining boss in a submarine gate-system mold for molding a resin. CONSTITUTION: A submarine gate-system mold, in which a resin material flows into a cavity for molding a product through a runner 11, a gate 12 provided in a lower mold 17, and a groove provided in an outer peripheral surface of a gate pin 1 for molding a machining boss 10, and a molded resin product 13 is removed by the gate pin 1, comprises a plate 7 provided with a bush 3 engaging with a spiral groove 19 provided in the outer peripheral surface of the gate pin, a spring 8 constantly pressing up the plate 7, and a support pin 6 pressing down the plate 7 at the time of closing a mold.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submarine gate type resin molding die and a resin molding method.

[0002]

2. Description of the Related Art A conventional submarine gate type resin molding die is known as "Injection molding die" published by Nikkan Kogyo Shimbun.
(2nd edition).

In FIG. 3, a lower die 17 is mounted on a lower die mounting plate 14 via a spacer block 15, and an upper die 18 is mounted on an upper die mounting plate 16. Ejector plates 4 and 5 are arranged between the lower die mounting plate 14 and the lower die 17, and the rear end of the gate pin 1 whose tip is slidably fitted in a hole provided in the lower die 17 is the ejector plate 4 , 5 fixed. The product 13 is molded between the lower mold 17 and the upper mold 18, and the resin material is the lower mold 17 and the upper mold 1.
8 from the runner 11 to the lower mold 17 and the groove provided in the outer peripheral surface of the gate pin 1 through the portion where the discard boss 10 is formed and flows into the cavity where the product 10 is formed. At the time of mold opening, the ejector plates 4 and 5 are moved in the direction of the lower mold 17, the tip of the gate pin 1 projects from the lower mold 17 to release the product 13, and the resin molded by the runner 11 is also not shown. It is released by the ejector pin. At this time, the resin of the gate portion 12 and the waste boss 10 are cut and separated, and the resin of the runner 11 and the gate 12 and the waste boss 10 and the product 13 are separated. After the discarding boss 10 and the product 13 are separated, they are separated (cut) using a nipper or the like in a separate process.

[0004]

In this conventional resin molding die of the submarine gate system, when the molded product is released from the mold, the waste boss portion and the product portion are not separated. There is a problem that the separation between the discarded boss and the product must be performed in a separate process after the molding.

[0005]

According to the present invention, a rear end is fixed to an ejector plate which is fitted in a hole provided in a lower mold, and when the mold is opened, the front end projects from the lower mold by pushing the ejector plate. A gate pin for releasing the resin-molded product from the mold, and a resin material is passed from a runner through a gate provided in the lower mold and a groove provided on an outer peripheral surface of the gate pin to a cavity in which the product is molded. In a resin molding die of a submarine gate type that flows in, a spiral groove provided on an outer peripheral surface of the gate pin, a bush that is engaged with the spiral groove, a plate disposed on the ejector plate, A spring that always pushes up toward the lower mold, and a rear end is provided in a direction in which the mold is opened and closed by fitting into a hole provided in the lower mold. Tip fixed mold closing is provided with a support pin abutting the upper die to the rate.

According to the present invention, there is provided a product, which is resin-molded such that the rear end is fixed to the ejector plate by being fitted in the hole provided in the lower mold and the front end is projected from the lower mold by pushing the ejector plate when the mold is opened. An outer periphery of the gate pin in a sub-marine gate type resin molding die, which has a gate pin for releasing the mold, and in which a resin material flows from a runner into a cavity in which the product is molded through a groove provided in the lower mold. A spiral groove provided on the surface, a plate provided on the ejector plate with a bush engaging with the spiral groove, and means for moving the plate in a direction in which the mold opens and closes when the mold is opened. I have it.

According to the present invention, the rear end is fixed to the ejector plate by being fitted in the hole provided in the lower mold, and the front end is resin-molded by the gate pin protruding from the lower mold when the ejector plate is pushed out when the mold is opened. In a resin molding method of a submarine gate method, the product is released from the mold, and a resin material is poured from a runner into a cavity in which the product is molded through a groove provided in a gate provided in the lower mold and a peripheral surface of the gate pin. The gate pin is rotated when the mold is opened.

[0008]

The present invention will be described below with reference to the drawings.

The gate pin 1 is provided with a rotary sesame 2 having a spiral groove 19 formed therein, and the rotary sesame 2 is attached to a bush 3 fixed to a plate 7 arranged on an ejector plate 4.
Is inserted, and the convex spherical portion 20 provided on the inner surface of the bush 3 is slidably engaged with the spiral groove 19. The plate 7 receives a force directed to the lower mold 17 by a coil spring 8 provided between the ejector plate 5 and the plate 7 through a hole provided in the ejector plate 4.
The plate 7 is pressed onto the ejector plate 4 by the support pin 6 whose front end is in contact with the upper die 18 and whose rear end is fixed to the plate 7 in a state where the hole provided in the hole is slidably fitted and the mold is closed. It is attached. In addition, a stopper having a flange at the tip protruding downward from the fitting portion of the hole, which is slidably fitted in the hole provided in the ejector plate 4 on the lower surface of the plate 7 and has the mold closed. Bolt 9
Is provided.

When the mold is opened, the support 6 protrudes from the upper surface of the lower mold 17 so that the support pin 6 is not pressed, and the plate 7 is pushed upward by the coil spring 8. (However, it stops at a certain position with a stopper bolt)
At this time, the convex spherical portion 20 of the bush 3 moves upward linearly through the spiral groove 19 of the rotary sesame 2, whereby the gate pin 1 rotates, and the state shown in FIG. 2 is obtained. By rotating the gate pin 1, the discarding boss 10 moves as shown in FIG. 2 and is cut from the product 10. Thereafter, the product 13, the runner 11, and the gate 12 are released by extruding the ejector plates 4 and 5, as in the conventional mold. The discard boss 10 falls by its own weight and is released from the gate pin 1.

When the mold is closed, the support pin 6 is pushed back by the upper mold 18 and the plate 7 is also pushed back onto the ejector plate 4 to rotate the sesame 2, the gate pin 1 and the disposal boss 1.
The part of 0 also returns to the original state shown in FIG.

The engagement between the spiral groove 19 and the bush 3 is not limited to that by the convex spherical portion 20, but the spiral groove 19 is used as the valley portion of the male screw, and the female screw provided on the bush 3 is screwed into this. But it's okay.

Further, the stopper bolt 9 is not always necessary. Instead, a rod having a predetermined length may be fixed to the lower surface of the lower die 17 or the upper surface of the plate 7 to serve as a stopper.

Further, instead of pushing up the plate 7 by the force of the coil spring 8, it may be moved by a hydraulic cylinder or the like.

[0015]

As described above, the resin molding die and the resin molding method of the submarine gate system according to the present invention rotate the gate pin at the time of mold release, thereby simultaneously releasing the resin molded product from the gate pin. Since the waste boss formed in the resin material supply flow path is separated from the product, there is an effect that it is not necessary to separate the waste boss from the product in another process after the completion of the product molding.

[Brief description of drawings]

FIG. 1 is a sectional view of a submarine gate type resin molding die according to an embodiment of the present invention when the die is closed.

FIG. 2 is a cross-sectional view of the embodiment shown in FIG. 1 when a mold is opened.

FIG. 3 is a cross-sectional view of a conventional submarine gate type resin molding die when the die is closed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gate pin 2 Rotating sesame 3 Bush 4 Ejector plate (upper) 5 Ejector plate (lower) 6 Support pin 7 Plate 8 Coil spring 9 Stopper bolt 10 Discard boss 11 Runner 12 Gate 13 Product 19 Spiral groove 20 Convex ball part

Claims (3)

[Claims] 1. A resin-molded product which is fitted into a hole provided in a lower mold and whose rear end is fixed to an ejector plate and whose tip protrudes from the lower mold by extrusion of the ejector plate when the mold is opened. Submarine gate type resin molding in which a resin material flows from a runner into a cavity in which the product is molded through a gate provided in the lower mold and a groove provided on an outer peripheral surface of the gate pin. In the mold, a spiral groove provided on the outer peripheral surface of the gate pin, a bush that engages with the spiral groove is provided, and a plate disposed on the ejector plate, and the plate is always directed toward the lower mold. A spring that is pushed up and is provided in a direction in which the mold is opened and closed by fitting into a hole provided in the lower mold, and a rear end is fixed to the plate and the mold is closed. Resin mold of submarine gate system, characterized in that it comprises a support pin tip comes into contact with the upper die to. 2. A product formed by resin molding in which a rear end is fitted to a hole provided in a lower die and a rear end is fixed to an ejector plate, and a tip is projected from the lower die by pushing out the ejector plate when the die is opened. In a mold for resin molding of a submarine gate system, which has a gate pin to be made, and a resin material flows from a runner into a cavity in which the product is molded through a groove provided in the lower mold, in an outer peripheral surface of the gate pin. A spiral groove provided therein; a plate provided with a bush engaging with the spiral groove and arranged on the ejector plate; and means for moving the plate in a direction in which the mold is opened and closed when the mold is opened. A sub-marine gate type resin molding die. 3. A product molded by a gate pin whose rear end is fixed to an ejector plate and which is pushed out of the ejector plate when the mold is opened and whose front end projects from the lower mold by fitting in a hole provided in the lower mold. In the resin molding method of the sub-marine gate method, the resin material is released from the runner and poured into the cavity in which the product is molded from the runner through the groove provided in the gate provided in the lower die and the outer peripheral surface of the gate pin. A resin molding method of a submarine gate method, wherein the gate pin is rotated when the mold is opened.