Process for improving surface quality of casting

A technology of surface quality and craftsmanship, applied in the technological field of improving the surface quality of castings, can solve the problems of low precision, poor surface quality of castings, and inability to achieve dimensional accuracy of precision casting, and achieve the effects of good strength, improved surface accuracy, and improved quality

Inactive Publication Date: 2015-08-12
LIUZHOU KEERTE FORGING MACHINERY
View PDF6 Cites 4 Cited by
  • Summary
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] A process for improving the surface quality of castings, comprising the steps of:

[0016] (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.

[0017] 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.

[0018] (2) Dewaxing.

[0019] (3) Shell mold roasting.

[0020] 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.

[0021] (4) Form a sand mold.

[0022] When the size of the flask is less than 500mm, after s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The present invention provides a process for improving the surface quality of the casting. The process is as below: roasting a shell mold by using a segmented heating roasting temperature mode, wherein when a sand box size is less than 500 mm, the distance between the outer side of the shell mold and the sand box is greater than or equal to 50mm, and the distance from the shell mold bottom to the sand box bottom is greater than or equal to 120mm; placing the prepared shell mold into the sand box prepared according to molding process, sealing a pouring gate and an insulation riser on the shell mold with tapes, then adding formulated mixed sand, conducting ram-jolt on the shell mold filled with sand by a molding jolter to form sand mold. The sand box is injected with mixed sand formulated with an alkaline phenolic resin, and has better strength and stability, can further improve the surface precision of casting and improve the quality of casting.

Description

technical field [0001] The invention relates to a process for improving the surface quality of 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 process for improving the surface quality of castings. [0004] Technical scheme of the present inv...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C1/22
CPCB22C9/02B22C1/22
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap