CN210552739U

CN210552739U - Thin-wall vacuum injection molding mold

Info

Publication number: CN210552739U
Application number: CN201921327845.6U
Authority: CN
Inventors: 邵月华; 杨海天
Original assignee: Changyuan Technology Tianjin Co ltd
Current assignee: Changyuan Technology Tianjin Co ltd
Priority date: 2019-08-15
Filing date: 2019-08-15
Publication date: 2020-05-19
Anticipated expiration: 2029-08-15

Abstract

The utility model discloses a thin wall vacuum injection moulding mould, include: the mold comprises a front mold plate, a rear mold plate, a front mold core, a rear mold core, a cavity, a runner sprue gate and a double-acting motor, wherein the front mold core and the rear mold core are respectively fixedly arranged on the front mold plate and the rear mold plate and form an injection mold cavity after mold closing, the runner sprue gate is communicated with the cavity, plastic in a high-temperature melting state is injected into the cavity through the runner sprue gate, the double-acting motor is used for pumping gas in the cavity during injection molding to promote plastic injection and molding, after injection molding is completed, the double-acting motor blows gas, and a product is ejected out through gas action; the utility model provides a large-scale thin wall product mould plastics in-process plastics and fill difficult problem, simplify the mould structure, reduce mould cost of manufacture, reduce product runner and hot runner point position defect quantity on the surface simultaneously, improve the pleasing to the eye degree of product when guaranteeing injection moulding product appearance requirement.

Description

Thin-wall vacuum injection molding mold

Technical Field

The utility model relates to an automobile injection mold designs the field, especially relates to a thin wall vacuum injection moulding mould.

Background

With the increasing light weight requirement of the automobile industry, the thinning requirement of the automobile interior and exterior trimming mold is greater and greater, so that the problem that the rapid molding and the mold cost control of the large-sized thin-wall mold are needed to be solved urgently at present is solved. After the plastic in a molten state is injected into the cavity by the common injection mold, the cavity is filled with the plastic in the molten state by the pressure of a screw of an injection molding machine, but the plastic needs to overcome the atmospheric pressure in the cavity when the cavity is filled at high speed and high pressure due to the tightness requirement of the cavity, and the large injection pressure is generated because the air is compressed quickly but cannot be discharged in time. Therefore, when the overall dimension of an injection product is large and the wall thickness of the product is small, the difficulty of plastic filling is increased, so that the number of hot runner points is increased to reduce the flow length of the plastic during filling, the cost of the mold is greatly increased, and meanwhile, when the appearance requirement of the product is high, the problem of injection molding and filling of a large-scale thin-wall mold cannot be solved when more gates are not allowed to be designed on the surface.

Disclosure of Invention

In order to solve the defects of the prior art, the utility model aims to provide a thin-wall vacuum injection molding mold.

In order to achieve the above purpose, the utility model is realized by the following technical scheme:

a thin-walled vacuum injection molding mold comprising: the mold comprises a front mold plate, a rear mold plate, a front mold core, a rear mold core, a cavity, a runner sprue gate and a double-action motor; the front mold core is fixedly arranged on the front mold plate, the rear mold core is fixedly arranged on the rear mold plate, and the front mold core and the rear mold core are assembled to form the cavity for filling and molding the product; the runner pouring gate penetrates through the inner surface of the rear mold core from top to bottom to be communicated with the cavity and serves as a plastic pouring inlet in the injection molding process; first air passages communicated with the cavity are arranged on the rear mold core at intervals; the rear template is provided with second air passages which are in one-to-one correspondence with the first air passages, are arranged at intervals and are communicated with each other; the two-way action motor sets up in one side of mould and with the second air flue passes through the trachea intercommunication, during injection moulding, through the two-way action motor extraction the gas in the die cavity to promote the packing and the shaping of injection moulding plastics, behind the injection moulding, through the two-way action motor blows out gas in order to ejecting injection moulding product.

Wherein, the first air passage and the second air passage are connected in a sealing way through a second sealing ring.

The first sealing ring is mounted at the joint of the front mold core and the rear mold core and used for sealing gas in the cavity during injection molding and preventing gas leakage during air suction of the bidirectional motor.

The tail end of the second air passage is located at the side end of the rear template and is blocked by a plug to prevent air leakage.

Wherein, the double-acting motor and the air pipe, and the air pipe and the second air passage are fixedly connected through air pipe joints.

Compared with the prior art, the utility model discloses an intentional effect is: before plastic injection, air in a mold cavity is pumped out through a bidirectional action motor to form a higher-vacuum-degree cavity, so that the resistance of plastic filling is reduced, the problem of difficulty in plastic filling in the injection molding process of a large-sized thin-wall product is solved, and after the injection molding is finished, the product is blown up through the bidirectional action motor to facilitate the product to be taken out; simultaneously, simplify the mould structure, effectively reduce mould cost of manufacture, in addition, can reduce runner and hot runner point location defect quantity on the product surface, improve the pleasing to the eye degree of product when guaranteeing injection moulding product appearance requirement.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

In the figure: 1-front mould plate, 2-rear mould plate, 3-front mould core, 4-rear mould core, 5-mould cavity, 6-first sealing ring, 7-runner pouring gate, 8-double-action motor, 9-first air channel, 10-second air channel, 11-second sealing ring, 12-plug, 13-air pipe and 14-air pipe joint.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer and more obvious, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, the utility model provides a thin wall vacuum injection moulding mould, include: the mold comprises a front mold plate 1, a rear mold plate 2, a front mold core 3, a rear mold core 4, a cavity 5, a runner sprue gate 7 and a double-acting motor 8; the front mold core 3 is fixedly arranged on the front mold plate 1 through screws, the rear mold core 4 is fixedly arranged on the rear mold plate 2, and the cavity 5 for plastic filling and molding products is formed in the middle after the front mold core 3 and the rear mold core 4 are assembled; the runner pouring gate 7 penetrates through the inner surface of the rear mold core 4 from top to bottom to be communicated with the cavity 5 and serves as a plastic pouring inlet in the injection molding process; four first air passages 9 which are communicated with the middle bottom of the cavity 5 and penetrate to the bottom of the rear mold core 4 are arranged on the rear mold core 4 at intervals; the rear template 2 is provided with second air passages 10, the upper end parts of which correspond to the first air passages 9 one by one and are arranged at intervals, and the lower end parts of which are communicated with each other, and the first air passages 9 and the second air passages 10 are hermetically connected through second sealing rings 11; the two-way acting motor 8 is arranged on one side of the mold and is communicated with the second air channel 10 through the air pipe 13, and during injection molding, the two-way acting motor 8 extracts air in the cavity 5 to promote filling and molding of injection molding plastic, and after injection molding, the two-way acting motor 8 blows out air to eject out an injection molding product.

Specifically, a first seal ring 6 is installed at the joint of the front mold core 3 and the rear mold core 4, and is used for sealing the gas inside the cavity 5 during injection molding and preventing gas leakage during air suction by using the double-acting motor 8.

Specifically, the end of the second air duct 10 is located at the side end of the rear template 2 and is blocked by a plug 12 to prevent air leakage.

Specifically, the double-acting motor 8 and the air pipe 13, and the air pipe 13 and the second air passage 10 are fixedly connected through air pipe joints 14.

The utility model discloses a theory of operation does: the mould is closed under the action of an injection molding machine, a pouring system of the injection molding machine injects the plastic in a high-temperature molten state into the cavity 5 through the runner pouring gate 7, meanwhile, the bidirectional action motor 8 is started, and the gas in the cavity 5 is extracted through the first air passage 9, the second air passage 10 and the gas pipe 13 so as to be close to a vacuum state, so that the plastic is promoted to be rapidly filled in the cavity 5 and molded; after the injection product is formed, the mold is opened, the two-way acting motor 8 stops pumping work and is converted into blowing work, and the injection product is ejected and taken away through the pushing of gas; to this end, one cycle of product formation using a thin-walled vacuum injection mold is completed and the next cycle begins.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A thin-wall vacuum injection molding mold, comprising: the device comprises a front template (1), a rear template (2), a front mold core (3), a rear mold core (4), a cavity (5), a runner pouring gate (7) and a double-action motor (8); the front mold core (3) is fixedly arranged on the front mold plate (1), the rear mold core (4) is fixedly arranged on the rear mold plate (2), and the front mold core (3) and the rear mold core (4) are matched to form the cavity (5) for filling and forming a product by plastics; the runner pouring gate (7) penetrates through the inner surface of the rear mold core (4) from top to bottom to be communicated with the cavity (5) and serves as a plastic pouring inlet in the injection molding process; the rear mould core (4) is provided with first air passages (9) communicated with the cavity (5) at intervals; the rear template (2) is provided with second air passages (10) which are in one-to-one correspondence with the positions of the first air passages (9), are arranged at intervals and are communicated with each other; the bidirectional action motor (8) is arranged on one side of the mold and is communicated with the second air passage (10) through an air pipe (13), during injection molding, the bidirectional action motor (8) is used for extracting air in the cavity (5) to promote filling and molding of injection molding plastic, and after injection molding, the bidirectional action motor (8) is used for blowing out air to eject an injection molding product.

2. A thin-walled vacuum injection mould according to claim 1, characterized in that the first air duct (9) and the second air duct (10) are sealingly connected by a second sealing ring (11).

3. A thin-walled vacuum injection mould according to claim 1, characterized in that the junction of the front mould core (3) and the rear mould core (4) is fitted with a first sealing ring (6) for sealing the gas inside the mould cavity (5) during injection moulding and preventing gas leakage during evacuation using the double acting motor (8).

4. A thin-walled vacuum injection mold as claimed in claim 1, wherein the end of the second air duct (10) is located at the side end of the rear mold plate (2) and is blocked by a plug (12) to prevent air leakage.

5. A thin-walled vacuum injection mould according to claim 1, characterized in that the double-acting motor (8) and the air pipe (13) and the second air duct (10) are fixedly connected by means of air pipe joints (14).