CN102896712A

CN102896712A - Plastic die

Info

Publication number: CN102896712A
Application number: CN 201210441891
Authority: CN
Inventors: 吕开山
Original assignee: KUNSHAN SILVER PRECISION MOLDING CO Ltd
Current assignee: KUNSHAN SILVER PRECISION MOLDING CO Ltd
Priority date: 2012-11-08
Filing date: 2012-11-08
Publication date: 2013-01-30

Abstract

The invention provides a plastic die, comprising a concave die and a convex die, wherein the concave die and the convex die are spliced together to form an injection runner (1), a pouring gate (2) and a cavity (3) which are communicated with one another. The plastic die is characterized in that the pouring gate (2) sequentially comprises a front end (4), an arc-shaped section (5), a tail end (6) and an injection opening (7); the front end (4) is connected with the injection runner (1); the injection opening (7) is connected with the cavity (3); and the inner diameter of the front end (4) is more than that of the tail end (6). A plastic product manufactured by the plastic die does not have a closed trace and is good in aesthetic degree and high in quality.

Description

A kind of plastic mould

Technical field

The present invention relates to a kind of plastic mould for compression moulding, extrusion molding, injection moulding, blowing and low foaming etc.

Background technology

Plastic mould is used for the techniques such as compression moulding, extrusion molding, injection moulding, blowing and low foaming.Plastic mould comprises die and punch, forms after die and the punch amalgamation to inject runner, cast gate and die cavity, injects runner, cast gate and die cavity and all is communicated with, and is the part feed system.

The effect of feed system is to guarantee that molten plastic liquid enters the filling die cavity fast, makes simultaneously the plastics liquid of gate part will cool off rapidly the sealing cast gate after die cavity is full of plastics liquid, and the plastic waste at cast gate place can separate automatically with plasthetics in the die cavity.The cast gate of existing plastic mould has the forms such as point type cast gate, down gate and latent cast gate, but all the existence meeting stays the sealing vestige at plasthetics, affects the shortcoming such as product aesthetics, is difficult to satisfy high-quality plasthetics requirement.

Summary of the invention

The invention provides a kind of plastic mould, do not seal vestige on the made plasthetics, the product aesthetics is good, and quality is high.

For achieving the above object, the technical solution used in the present invention is: a kind of plastic mould, comprise die and punch, form after die and the punch amalgamation and inject runner, cast gate and die cavity, its injection runner, cast gate and die cavity all are communicated with, and cast gate comprises head end, segmental arc, end and inlet successively, and wherein head end is connected with the injection runner, inlet is connected with die cavity, and the internal diameter size of head end is greater than the internal diameter size of end.

Further, described inlet is large tubaeform of the little outlet of import, and the internal diameter size of its import is less than the internal diameter size of cast gate end.

The invention has the beneficial effects as follows: equal flow velocity and overflow section product principle according to flow, equate that at flow flow velocity and overflow section are inversely proportional under the condition.When plastic mould uses, molten plastic liquid enters the filling die cavity through injecting runner and cast gate, cast gate comprises the head end that connects successively, segmental arc, end and inlet, the internal diameter size of cast gate head end is greater than the internal diameter size of end, heat and the pressure loss were little when the large scale of head end can guarantee that molten plastic liquid enters, and the terminal internal diameter size of cast gate is little, flow velocity increases herein, the plastics liquid cooling is rapid, rapidly sealing, the waste material that makes cast gate end after the formed product die sinking easily with die cavity in plasthetics disconnect, realize automatically separating the high accuracy of assurance plasthetics and attractive in appearance.

In addition, inlet is large tubaeform of the little outlet of import, and the internal diameter size of import so that import department's plastics flow velocity of inlet increases again, strengthens the automatic separating effect of waste material less than the internal diameter size of cast gate end.

Description of drawings

Accompanying drawing 1 is the cross-sectional schematic of a kind of plastic mould of the present invention;

Accompanying drawing 2 is the A place enlarged drawing in the accompanying drawing 1.

In the above accompanying drawing: 1, inject runner; 2, cast gate; 3, die cavity; 4, head end; 5, segmental arc; 6, end; 7, inlet.

The specific embodiment

The invention will be further described below in conjunction with drawings and Examples:

Embodiment: shown in accompanying drawing 1～2, a kind of plastic mould, comprise die and punch, form after die and the punch amalgamation and inject runner 1, cast gate 2 and die cavity 3, its injection runner 1, cast gate 2 and die cavity 3 all are communicated with, and cast gate 2 comprises head end 4, segmental arc 5, end 6 and inlet 7 successively, and wherein head end 4 is connected with injection runner 1, inlet 7 is connected with die cavity 3, and the internal diameter size of head end 4 is greater than the internal diameter size of end 6.

Inlet 7 is large tubaeform of the little outlet of import, and the internal diameter size of its import is less than the internal diameter size of cast gate 2 ends 4.

Equal flow velocity and overflow section product principle according to flow, equate that at flow flow velocity and overflow section are inversely proportional under the condition.When plastic mould uses, molten plastic liquid enters filling die cavity 3 through injecting runner 1 and cast gate 2, heat and the pressure loss were little when the large scale of cast gate 2 head ends 4 can guarantee that molten plastic liquid enters, and cast gate 2 terminal 6 internal diameter sizes are little, and flow velocity increases herein, and the plastics liquid cooling is rapid, rapidly sealing, make after the formed product die sinking terminal 6 waste material easily with die cavity 3 in plasthetics disconnect, realize automatically separating the high accuracy of assurance plasthetics and attractive in appearance.

In addition, import department's plastics flow velocity of inlet 7 increases again, has more strengthened the automatic separating effect of waste material.

Claims

1. plastic mould, comprise die and punch, form after described die and the punch amalgamation and inject runner (1), cast gate (2) and die cavity (3), it injects runner (1), cast gate (2) and die cavity (3) and all is communicated with, it is characterized in that: described cast gate (2) comprises head end (4), segmental arc (5), terminal (6) and inlet (7) successively, wherein head end (4) is connected with described injection runner (1), inlet (7) is connected with die cavity (3), and the internal diameter size of head end (4) is greater than the internal diameter size of terminal (6).

2. plastic mould according to claim 1 is characterized in that: described inlet (7) is large tubaeform of the little outlet of import, and the internal diameter size of its import is less than the internal diameter size of described cast gate (2) terminal (4).