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Manufacturing method of core filler for investment casting

A technology of sand core filler and production method, which is applied to casting molding equipment, molds, cores, etc., can solve problems such as high scrap rate, depression, and surface finish that cannot meet customer approval, and achieve the effect of easy sand cleaning

Inactive Publication Date: 2010-11-10
浙江红马铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hole of the product made according to the conventional process is filled with molten steel, and the scrap rate is very high. Even if the product can be formed, the surface finish inside the hole cannot meet the customer's approval, and the middle part of the hole is sunken.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] The preparation method of the sand core filler for investment casting of the present invention selects ingredients according to the mass percentage ratio: chrome ore: foaming alkali = 10:1, and fully stirs the above ingredients evenly. The foaming alkali density is 1.35g / cm 3 .

[0008] The present invention uses chromium ore sand in sand casting as a filler, which is inserted into the small holes, deep holes and narrow grooves of the sand core during the manufacturing process of the sand core to fill the parts in the small holes, deep holes and narrow grooves that cannot be filled with sand. After the chrome ore sand filler is stuffed into the hole or groove of the sand core and hardened, the strength and high temperature strength of the sand core exceed that of quartz sand and sagger sand. The surface of the small holes in the casting is not only smooth, but also easy to remove sand during finishing, and the small holes are not deformed.

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Abstract

The invention discloses a manufacturing method of core filler for investment casting, comprising the folloing steps: selecting chrome ore and sodium silicate as the ingredient at the ratio of 10:1, and fully stirring the ingredient. Because the invention adopts the technical scheme, after the chrome ore filler is hardened in the hole or groove of the core, the strength and the high-temperature strength of the core exceed those of the quartz sand and sagger sand. The surfaces of the ostiole, longhole and narrow groove are gloss and easy to remove the sand during finishing, and the ostiole has small possibility of deforming.

Description

technical field [0001] The invention relates to a method for making sand core filler for investment casting. Background technique [0002] At present, in most precision casting industries, it is necessary to make ceramic cores to complete the production of small holes, deep holes, and narrow grooves in castings, especially when the holes and grooves on thick-walled castings require high dimensional accuracy. Shaping becomes an issue that must be taken seriously. The hole of the product made according to the conventional process is filled with molten steel, and the scrap rate is very high. Even if the product can be formed, the surface finish inside the hole cannot meet the customer's approval, and the middle part of the hole is sunken. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for making sand core fillers for investment casting, so that the surfaces of small holes, deep holes and narrow grooves in...

Claims

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Application Information

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IPC IPC(8): B22C1/00
Inventor 李根
Owner 浙江红马铸造有限公司
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