CN86104403A

CN86104403A - The manufacture method of the long-life resin dies of plastics injection

Info

Publication number: CN86104403A
Application number: CN86104403.7A
Authority: CN
Inventors: 陈铁铮
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-06-15
Filing date: 1986-06-15
Publication date: 1987-11-11
Also published as: CN1003636B

Abstract

The present invention a kind ofly makes the life-span of the resin die of plastics injection extend to the method that is bordering on the punching block level, and be characterized in: mold cavity surface is the high-melting-point that forms under normal temperature condition, high-intensity thin metal layer.Therefore be not subjected to the restriction of exemplar fusing point during molding.The height of plastic injecting temperature, injected current washes away and the influences such as effect of melted state plastic and resin during with mould, so the life-span can be near the punching block level, and kept resin die can one-shot forming, advantage such as molding is fast, cost is low, the mold cavity surface height is accurate.

Description

The manufacture method of the long-life resin dies of plastics injection

The invention belongs to the manufacture method of mould, more particularly is the method that extends to the punching block level a kind of life-span the resin die of plastics injection.

We know, at present general resin die is with cooperation accessory agent such as high molecular synthetic resin such as epoxy resin, phenolic resins and reinforcing agent is cast, colds pressing or hot pressing is made.The outstanding advantage of this class mould is: makes easily, and die cavity precision height, moulding is fast, and cost is low.Particularly to complex-shaped, decorative pattern is meticulous, be difficult to the mould that machined is shaped, and adopts resin mold prodigiosin once-forming.Cost only is the sixth of traditional punching block; Process-cycle can shorten ten times to tens times.But when this class mould was used as injection molding, the life-span was but very low.External frequency injection only reaches several thousand times, and domestic more than 1,000 time.Life-span, low main cause had two: the poor heat resistance of first resin own, and calorific intensity is low, and thermal conductivity factor is again little.It two is because resin and plastics all belong to high-molecular organic material, and under the plastic injecting temperature condition, the plastics of molten state easily react with resin, forms bonding or corrodes, and makes the meticulous decorative pattern or the fineness of mold cavity surface destroyed, the life-span reduction.Range of application is restricted.At present, both at home and abroad just in the new way of this technical barrier of seeking breakthrough.

The object of the present invention is to provide a kind of manufacture method of long-life resin dies of plastics injection.This method institute molding jig not only keeps whole advantages of primary resin mould, and has overcome low shortcoming of life-span.Its life-span can be near the level of traditional punching block.

In order to achieve the above object, we have qualified shape, on the exemplar surface of size and decorative pattern, all coat antitack agent, are the boundary again with the die joint, the part of temporary transient not molding, cover with wax.By vacuum evaporation or plating, make and plan to form on the surface of molding part a layer thickness by 0.01～0.5 millimeter the high-melting-point that has, high-intensity thin metal layer is as metal films such as copper, iron, nickel or chromium.Then plate the part translate into below, be fixed in the general die body, pour into the fluidised form resin that is mixed with suitable metal powder.Solidifying back taking-up exemplar gets final product.And go out the mould of remainder with legal system.Because mold cavity surface is high-melting-point, high duty metal layer, not only Rong Hua plastics can not contact with resin, have no way of taking place bonding or corrosion, and the temperature of injected current also can not reduce the intensity of mold cavity surface, therefore washing away of injected current can not be damaged mold cavity surface.Thereby reached purpose of the present invention.

Making the resin die mold cavity surface form the realization of one deck high-melting-point, this requirement of high duty metal layer, is to depend in vacuum evaporation or electroplating process, and exemplar is to be in the normal temperature state all the time.Only in this way, fusing point, burning-point or the thermal deformation of exemplar material (as wax, leather etc.) etc. are just unrestricted.And the bonding strength with metal level behind the resin solidification is very high, is difficult for delamination; Pick-up metal powder in the resin had both increased intensity, had strengthened the capacity of heat transmission again.Therefore, whole advantages of resin die are kept, and the low problem of life-span when being used for the plastics injection also is solved.

Accompanying drawing has been described embodiments of the invention.Be summarized as follows:

(1) be that diameter is the cowhide face medicine ball exemplar of 50 millimeters of φ.Earlier all surfaces being coated antitack agent, is the boundary with die joint A-A again, and the latter half wouldn't molding covers with wax.Wax is made the profile as accompanying drawing, and leave cast gate and rising head (7), adopt vacuum vapour deposition on the episphere surface, to form thick about 0.05 millimeter copper layer (2), again episphere is turned down, be fixed on the appropriate location of general die body (3), then the fluidised form epoxy resin (4) that evenly stirs into iron powder is poured into from one of (7) mouthful, to another (7) mouth water full till.After the curing, take out exemplar, this half module manufacturing finishes.Make second half mould with method.This mould is the resin die of injection of plastic medicine ball, reaches purpose of the present invention.

(5) (6) are the stems that formation injection orifice and steam vent are used.

Claims

1, a kind of manufacture method of long-life resin dies of plastics injection is characterized in that making the resin die mold cavity surface to form high-melting-point high duty metal layer under normal temperature condition.

2,, it is characterized in that the mold cavity surface high melting point metal layer is with vacuum vapour deposition or galvanoplastic and form according to claim 1 described die-manufacturing method.

3, according to claim 1,2 described die-manufacturing methods, the thickness that it is characterized in that formed high melting point metal layer is 0.01～0.5 millimeter.

4,, it is characterized in that said resin is mixed with copper or metal powders such as iron or chromium according to claim 1 described die-manufacturing method.