Molding sand for gravity casting and preparation process thereof

A technology of gravity casting and molding sand, which is applied in the direction of casting molding equipment, casting molds, manufacturing tools, etc. It can solve the problems of difficult control of molding sand compaction rate, loose process control, and subcutaneous pores, so as to reduce the crushing and magnetic separation process, Guarantee firmness and fluidity, increase work efficiency

Active Publication Date: 2016-11-09
SUZHOU DONGHAI GLASS MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the main defect of the existing technology is that the water content of the molding sand is not strictly controlled, resulting in the appearance of castings, subcutaneous pores, or sand washing, forming sand holes and fleshy
The compaction rate of the molding sand is difficult to control, resulting in difficulty in mold removal during molding, or poor fluidity of the molding sand, uneven compaction of the molding sand in the entire sandbox after molding, and local sand swelling and other defects.
The mixing time process of mixed molding sand is not strictly controlled, which leads to the inability to mix the components of the prepared molding sand or the mixing rhythm cannot keep up with the molding production rhythm
The distribution ratio of each component of the molding sand is not strictly regulated, which makes it difficult to control the overall quality of the molding sand
[0004] The above-mentioned deficiencies in the existing clay green sand preparation process have resulted in a low yield of glass mold casting blanks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The molding sand comprises: 95 parts of old sand, 5 parts of new sand, 0.9 part of bentonite, 0.4 part of coal powder and 4 parts of water. The specific preparation process includes:

[0027] (100) When recycling old sand, first remove the waste sand close to the rough surface of 1~3mm during shakeout, and do not mix it into the old sand that can be recycled repeatedly;

[0028] (200), the old sand that can be recycled is evenly wetted overnight with 75% of the total water required, and it is used for the next day's work;

[0029] (300). During the mixing process, the old sand is first put into the quantitative funnel, and it is automatically crushed during the process of falling into the quantitative funnel. Add a magnetic separation device to screen out the iron produced by casting. At the same time, in the process of transporting the old sand, add new sand evenly. The amount of new sand added is 5% of the total weight of the mixed sand. The specific value is determi...

Embodiment 2

[0034] The molding sand comprises: 94 parts of old sand, 6 parts of new sand, 0.8 part of bentonite, 0.4 part of coal powder and 5 parts of water. The specific preparation process includes:

[0035] (100) When recycling old sand, first remove the waste sand close to the rough surface of 1~3mm during shakeout, and do not mix it into the old sand that can be recycled repeatedly;

[0036] (200), the old sand that can be recycled is evenly wetted with 70% of the total water required overnight, and it is used for the next day's work;

[0037] (300). During the mixing process, the old sand is first put into the quantitative funnel, and it is automatically crushed during the process of falling into the quantitative funnel. Add a magnetic separation device to screen out the iron produced by casting. At the same time, in the process of transporting the old sand, add new sand evenly. The amount of new sand added is 6% of the total weight of the mixed sand. The specific value is determi...

Embodiment 3

[0042] The molding sand includes: 96 parts of old sand, 4 parts of new sand, 1.2 parts of bentonite, 0.48 parts of coal powder, and 5 parts of water. The specific preparation process includes:

[0043] (100) When recycling old sand, first remove the waste sand close to the rough surface of 1~3mm during shakeout, and do not mix it into the old sand that can be recycled repeatedly;

[0044] (200), the old sand that can be recycled is evenly wetted with 80% of the total water required overnight, and it is used for the next day's work;

[0045] (300). During the mixing process, the old sand is first put into the quantitative funnel, and it is automatically crushed during the process of falling into the quantitative funnel. Add a magnetic separation device to screen out the iron produced by casting. At the same time, in the process of transporting the old sand, add new sand evenly. The amount of new sand added is 4% of the total weight of the mixed sand. The specific value is dete...

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PUM

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Abstract

The invention discloses molding sand for gravity casting and a preparation process thereof. The molding sand comprises 100 parts of mixed sand, 0.8-1.2 parts of bentonite, coal dust accounting for 30-50% of the bentonite by mass, and 3-5 parts of water; and the 100 parts of mixed sand is prepared by mixing 93-96 parts of old sand with 4-7 parts of new sand, and the above-mentioned parts are by mass. Homogeneous and qualified clay green sand with stable performance can be obtained through the molding sand for gravity casting and the preparation process thereof.

Description

technical field [0001] The invention relates to the field of glass moulds, in particular to a molding sand for gravity casting and a preparation process thereof. Background technique [0002] In view of the production process and environment of glass bottles and jars, the surface of the blank inner cavity required for important glass mold parts must be cast with a dense chilled layer, instead of continuous casting bars or other molding materials. Based on the current experience and production practice in the industry, it is generally accepted that the casting process of gravity clay sand wet casting has significant advantages over resin sand casting or other casting methods. First, the production process is mature and the casting blanks are of good quality. The second is that the production cost is low, the pollution produced is less, and no irritating odor will be produced, which will affect the health of workers. The working environment of workers is relatively good. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00
CPCB22C1/00
Inventor 唐剑锋
Owner SUZHOU DONGHAI GLASS MOLD
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