CN104759590A - Investment casting method - Google Patents

Abstract

The invention provides an investment casting method, wherein a wax mould is composed of 50% of paraffin and 50% of a stearic acid mixture material. The investment casting method includes following steps: (A) firstly making a profiling, and then pressing the was mould, and soaking the preformed wax mould into a slurry material composed of ceramic granules and a colloid liquid binding agent for forming a coating on the wax mould, and then drying the wax mould; and (B) spraying a fireproof material granule onto the coating or coating a slurry material composed of the fireproof material granule and the colloid liquid binding agent, and drying the coated wax mould. The investment casting method is simple. Because that the casting liquid is good in flowability and is free of mould joints, an irregular-shaped structure being good in quality and complex in structure can be formed.

Description

A kind of investment casting method

Technical field

The present invention relates to a kind of investment casting method, belong to field of mechanical technique.

Background technology

In prior art, general medium-sized and small enterprises adopt sand mould casting method for the part that opposed configuration shape is more complicated, although sand mould casting method can adapt to various complex-shaped part, but its produced product quality is bad, dimensional accuracy is also lower, product there is die joint, is difficult to adapt to the manufacturing requirement of modern machines.

Summary of the invention

The invention provides a kind of investment casting method, can cast out complex-shaped ironcasting, castability is good.

For solving above technical problem, the invention provides following technical scheme: a kind of investment casting method, wax-pattern is the paraffin of 50% and the stearic acid compound of 50%, described investment casting method comprises the following steps: a, first manufacture die mould, then wax-pattern is suppressed, preformed wax-pattern is immersed in the slurry of ceramic particle and colloidal liquid binder formation, on described model, form coating whereby, dry; In described coating, the slurry of sprayable refractory particle or applying of refractory material particle and colloidal liquid binder formation, dry;

B, be coated with refractory material on wax-pattern surface and form firm shell, mainly comprise dip-coating material, stucco and sclerosis, the process forming firm shell is repeated multiple times, to form the thick setting refractory shell of 5-10mm, during stucco, after the particle diameter of which floor sand used larger than first and second layer of sand grains footpath used;

C, to be immersed in upward in the water of 85-95 degree forming the wax-pattern cast gate after firm shell, to make wax material fusing wherein, keep afloat, or shell is watered mouth down and be placed in autoclave, in autoclave, pass into the steam of 0-2-0.5MPa, wax material is melted out;

D, the shell after dewaxing to be sent in heating furnace, be heated to 800-1000 DEG C and carry out roasting;

E, the shell after dewaxing is placed in iron case, surrounding coarse sand tamps reinforcing shell, and the sclerosis of shell adopts drying or chemicosolidifying.

F, to pour into a mould while hot after roasting is come out of the stove, after foundry goods cooled and solidified, shell destroyed and takes out foundry goods, with oxy-acetylene flame excision water, rising head; The temperature of wherein pouring into a mould is 600-700 DEG C.

This investment casting method that the present invention relates to, method is simple, and good fluidity, does not have die joint, therefore, it is possible to form the good and baroque polymorphic structure of quality.

Detailed description of the invention

A kind of investment casting method, described wax-pattern is the paraffin of 50% and the stearic acid compound of 50%, described investment casting method comprises the following steps: a, first manufacture die mould, then wax-pattern is suppressed, preformed wax-pattern is immersed in the slurry of ceramic particle and colloidal liquid binder formation, coating is formed whereby on described model, dry; In described coating, the slurry of sprayable refractory particle or applying of refractory material particle and colloidal liquid binder formation, dry;

B, be coated with refractory material on wax-pattern surface and form firm shell, mainly comprise dip-coating material, stucco and sclerosis, the process forming firm shell is repeated multiple times, to form the thick setting refractory shell of 5-10mm, during stucco, after the particle diameter of which floor sand used larger than first and second layer of sand grains footpath used;

C, to be immersed in upward in the water of 85-95 degree forming the wax-pattern cast gate after firm shell, to make wax material fusing wherein, keep afloat, or shell is watered mouth down and be placed in autoclave, in autoclave, pass into the steam of 0-2-0.5MPa, wax material is melted out;

D, the shell after dewaxing to be sent in heating furnace, be heated to 800-1000 DEG C and carry out roasting;

E, the shell after dewaxing is placed in iron case, surrounding coarse sand tamps reinforcing shell, and the sclerosis of shell adopts drying or chemicosolidifying.

F, to pour into a mould while hot after roasting is come out of the stove, after foundry goods cooled and solidified, shell destroyed and takes out foundry goods, with oxy-acetylene flame excision water, rising head; The temperature of wherein pouring into a mould is 600-700 DEG C.

This investment casting method that the present invention relates to, method is simple, due to the good fluidity of potting syrup, does not have die joint, therefore, it is possible to form the good and baroque polymorphic structure of quality.

Detailed description of the invention of the present invention does not form the restriction to the application's scope; within every spirit in the present invention's design and principle, any amendment that one of skill in the art can make, equivalent to replace and improvement etc. all should be included within protection scope of the present invention.

Claims (1)

1. an investment casting method, wax-pattern is the paraffin of 50% and the stearic acid compound of 50%, it is characterized in that, described investment casting method comprises the following steps: a, first manufacture die mould, then wax-pattern is suppressed, preformed wax-pattern is immersed in the slurry of ceramic particle and colloidal liquid binder formation, on described model, form coating whereby, dry; In described coating, the slurry of sprayable refractory particle or applying of refractory material particle and colloidal liquid binder formation, dry;

B, be coated with refractory material on wax-pattern surface and form firm shell, mainly comprise dip-coating material, stucco and sclerosis, the process forming firm shell is repeated multiple times, to form the thick setting refractory shell of 5-10mm, during stucco, after the particle diameter of which floor sand used larger than first and second layer of sand grains footpath used;

C, to be immersed in upward in the water of 85-95 degree forming the wax-pattern cast gate after firm shell, to make wax material fusing wherein, keep afloat, or shell is watered mouth down and be placed in autoclave, in autoclave, pass into the steam of 0-2-0.5MPa, wax material is melted out;

D, the shell after dewaxing to be sent in heating furnace, be heated to 800-1000 DEG C and carry out roasting;

E, the shell after dewaxing is placed in iron case, surrounding coarse sand tamps reinforcing shell, and the sclerosis of shell adopts drying or chemicosolidifying;

F, to pour into a mould while hot after roasting is come out of the stove, after foundry goods cooled and solidified, shell destroyed and takes out foundry goods, with oxy-acetylene flame excision water, rising head; The temperature of wherein pouring into a mould is 600-700 DEG C.