CN105983656A - Investment casting technology - Google Patents

Abstract

The invention discloses an investment casting technology. The investment casting technology comprises the following steps: 1) manufacturing a mold shell; 2) fusing wax mould; 3) compressing for production; 4) casting; 5) manufacturing a wax mold; 6) roasting the mold shell; and 7) shelling and cleaning. The investment casting technology is capable of strictly controlling the technological parameters at different phases, increases the product performance, obviously reduces the processes, and has simple technology.

Description

A kind of full form casting process

Technical field

The invention belongs to pouring technology field, specifically a kind of full form casting process.

Background technology

In the prior art, full form casting process, briefly make meltability model with fusible material exactly, if the fireproof coating that coating dried layer is special thereon, through being dried and after hardening one overall shell of formation, from shell, melt model with steam or hot water again, then shell is placed in sandbox, fills dry moulding in its surrounding, finally casting mold is put in roaster through high-temperature roasting, casting mold or shell fired after, obtain foundry goods in wherein casting molten metal.But casting dimension can not the biggest complex technical process foundry goods rate of cooling slow. model casting is in all blank forming methods, technique is the most complicated, casting cost is the highest, but as fruit product selects proper, Element Design is reasonable, high casting cost is owing to reducing machining, assemble and save the aspects such as metal material and be compensated, then model casting just can have good economy.

Summary of the invention

The deficiency existed in view of prior art, it is an object of the invention to provide a kind of full form casting process enhanced product performance and have good economy.

The technical scheme realizing the object of the invention is as follows:

A kind of full form casting process, it is characterised in that this processing method comprises the following steps:

(1) manufacture shell: hang one layer of coating prepared with waterglass and silica flour in the leaching of wax-pattern group surface, on model casting, then spread one layer of thinner silica sand, and put into hardening in firming agent.Making to form the hard shell being made up of multiple layer refractory outside wax-pattern group, generally 3～50 layers, the gross thickness of shell is 3～6mm；

(2) fusing wax-pattern: be placed in the hot water of 80～90 DEG C by the shell with wax-pattern group, flows out after making wax material fusing, the shell after the demoulding from running gate system；

(3) die mould manufacture: model casting die mould is used to manufacture the particular manufacturing craft of wax-pattern, it is that the master mold made by the shape and size according to foundry goods manufactures；When casting accuracy is high or produces in enormous quantities, die mould is typically made with steel, copper alloy or aluminium alloy are machined；For small lot batch manufacture or casting accuracy less demanding time, fusible alloy can be used, plastics or Gypsum Fibrosum directly form to master mold upper；

(4) cast: after being taken out from roaster by shell, stacks dry sand around model casting, reinforces shell, 630～750 DEG C the most while hot, pour into aluminium alloy, and solidify cooling；

(5) manufacture wax-pattern: wax-type material commonly uses 40% paraffin and 60% stearic acid is formulated, and wax material is heated to pasty state, under pressure in press-in die cavity, after cooling, take out from die mould and obtain a wax-pattern；

(6) roasting of shell: the shell after dewaxing is put in heating furnace, is heated to 780～930 DEG C, insulation 0.8～2.5h, the residual wax in burning-off shell and moisture, clean die cavity；

(7) shell and clear up: removing shell, excision dead head with artificial or investment casting method, after cleaning, i.e. obtain foundry goods.

A kind of full form casting process of the present invention is a kind of method of high economic benefit, is strictly controlled each stage process parameter, improves properties of product, and operation substantially reduces, and technique is simple.

Detailed description of the invention

Below in conjunction with embodiment, the invention will be further described, and its operating procedure is as follows:

A kind of full form casting process, this processing method comprises the following steps:

(1) manufacture shell: hang one layer of coating prepared with waterglass and silica flour in the leaching of wax-pattern group surface, on model casting, then spread one layer of thinner silica sand, and put into hardening in firming agent.Making to form the hard shell being made up of multiple layer refractory outside wax-pattern group, generally 3～50 layers, the gross thickness of shell is 3～6mm；

(2) fusing wax-pattern: be placed in the hot water of 80～90 DEG C by the shell with wax-pattern group, flows out after making wax material fusing, the shell after the demoulding from running gate system；

(3) die mould manufacture: model casting die mould is used to manufacture the particular manufacturing craft of wax-pattern, it is that the master mold made by the shape and size according to foundry goods manufactures；When casting accuracy is high or produces in enormous quantities, die mould is typically made with steel, copper alloy or aluminium alloy are machined；For small lot batch manufacture or casting accuracy less demanding time, fusible alloy can be used, plastics or Gypsum Fibrosum directly form to master mold upper；

(4) cast: after being taken out from roaster by shell, stacks dry sand around model casting, reinforces shell, 630～750 DEG C the most while hot, pour into aluminium alloy, and solidify cooling；

(5) manufacture wax-pattern: wax-type material commonly uses 40% paraffin and 60% stearic acid is formulated, and wax material is heated to pasty state, under pressure in press-in die cavity, after cooling, take out from die mould and obtain a wax-pattern；

(6) roasting of shell: the shell after dewaxing is put in heating furnace, is heated to 780～930 DEG C, insulation 0.8～2.5h, the residual wax in burning-off shell and moisture, clean die cavity；

(7) shell and clear up: removing shell, excision dead head with artificial or investment casting method, after cleaning, i.e. obtain foundry goods.

The preferred embodiment of the present invention described in detail above.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.Therefore, all technical staff in the art, all should be at the protection domain being defined in the patent claims the most on the basis of existing technology by logic minute analysis, reasoning or the available technical scheme of limited experiment.

Claims (1)

1. a full form casting process, it is characterised in that this processing method comprises the following steps:

(1) manufacture shell: hang one layer of coating prepared with waterglass and silica flour in the leaching of wax-pattern group surface, on model casting, then spread one layer of thinner silica sand, and put into hardening in firming agent；Making to form the hard shell being made up of multiple layer refractory outside wax-pattern group, generally 3～50 layers, the gross thickness of shell is 3～6mm；

(2) fusing wax-pattern: be placed in the hot water of 80～90 DEG C by the shell with wax-pattern group, flows out after making wax material fusing, the shell after the demoulding from running gate system；

(3) die mould manufacture: model casting die mould is used to manufacture the particular manufacturing craft of wax-pattern, it is that the master mold made by the shape and size according to foundry goods manufactures；When casting accuracy is high or produces in enormous quantities, die mould is typically made with steel, copper alloy or aluminium alloy are machined；For small lot batch manufacture or casting accuracy less demanding time, fusible alloy can be used, plastics or Gypsum Fibrosum directly form to master mold upper；

(4) cast: after being taken out from roaster by shell, stacks dry sand around model casting, reinforces shell, 630～750 DEG C the most while hot, pour into aluminium alloy, and solidify cooling；

(5) manufacture wax-pattern: wax-type material commonly uses 40% paraffin and 60% stearic acid is formulated, and wax material is heated to pasty state, under pressure in press-in die cavity, after cooling, take out from die mould and obtain a wax-pattern；

(6) roasting of shell: the shell after dewaxing is put in heating furnace, is heated to 780～930 DEG C, insulation 0.8～2.5h, the residual wax in burning-off shell and moisture, clean die cavity；

(7) shell and clear up: removing shell, excision dead head with artificial or investment casting method, after cleaning, i.e. obtain foundry goods.