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Precision casting process of casting part

A technology of precision casting and craftsmanship, applied in the field of machinery, can solve the problems of low precision, difficulty in guaranteeing the quality of castings, and inability to guarantee the strength of shell molds.

Inactive Publication Date: 2015-08-19
LIUZHOU KEERTE FORGING MACHINERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For some castings with complex structures, especially the shell molds with different thicknesses and sizes, the strength cannot be guaranteed, and the quality of the castings is also difficult to guarantee. Therefore, in the industry, this kind of castings are generally completed by sand casting, but Sand casting cannot achieve the dimensional accuracy of precision casting, and the surface quality and precision of castings are poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] A precision casting process for castings, comprising the following steps:

[0015] (1) Wax mold preparation: Low-temperature wax and mechanical wax injection technology are used to make wax molds that are consistent with castings and include insulation risers.

[0016] Dip-coat the slurry prepared with maleic powder and silica sol binder on the surface of the prepared wax pattern, the viscosity of the slurry is 7-9 seconds; put the wax pattern at a wind speed of 0.8-1.0 m / s for drying , The drying time is 12 to 24 hours.

[0017] (2) Dewaxing.

[0018] (3) Shell mold roasting.

[0019] The shell mold of step (2) is roasted in a staged heating and roasting method. During roasting: firstly, the heating rate is controlled at 120 degrees per hour before 550 degrees; temperature, and keep it at 1050 degrees for half an hour, and finally take it out of the oven to cool.

[0020] (4) Form a sand mold.

[0021] (5), pouring.

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Abstract

The invention provides a precision casting process of a casting part. A shell mold in a fourth step is baked in a sectioned temperature rise baking mode. In the baking process, firstly, temperature rise speed is controlled to be 120 DEG C per hour before the temperature of 550 DEG C; secondly, the temperature of 550 DEG C is kept for one hour; thirdly, the temperature rises to 1050 DEG C at full speed, and the temperature of 1050 DEG C is kept for half an hour; finally, the shell mold is discharged and cooled. Respective advantages of the precision casting process and a sand casting process are combined, the high-strength shell mold is formed by the sectioned temperature rise baking mode, and the strength requirement of casting a large casting part is met.

Description

technical field [0001] The invention relates to a precision casting process for castings, belonging to the technical field of machinery. Background technique [0002] The commonly used precision casting method is usually to obtain castings from mold making, wax mold making, shell mold making, roasting, and pouring metal. For some castings with complex structures, especially the shell molds with different thicknesses and sizes, the strength cannot be guaranteed, and the quality of the castings is also difficult to guarantee. Therefore, in the industry, this kind of castings are generally completed by sand casting, but Sand casting cannot achieve the dimensional accuracy of precision casting, and the surface quality and precision of castings are poor. Contents of the invention [0003] In order to overcome the defects of the prior art, the invention provides a precision casting process for castings. [0004] Technical scheme of the present invention is: [0005] A precisi...

Claims

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Application Information

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IPC IPC(8): B22C9/04
Inventor 何拥军何嘉圣何嘉贤蒋漓洪杜贵明梁兵赖卫华
Owner LIUZHOU KEERTE FORGING MACHINERY
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