Sand core composite coating for casting and application thereof

A composite coating and foundry sand technology, applied in foundry molding equipment, coatings, molds, etc., can solve problems such as poor leveling and wettability of coatings, insufficient bonding between sand cores and coatings, and affecting casting, etc. Achieve good plane integrity, good transfer resonance effect, and improve the effect of surface flatness

Inactive Publication Date: 2021-04-16
刘飞杨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, some sand cores can be reused in the production of specific castings, but due to the relationship between the paint, some mold sands will fall off when peeled off and there will be defects that will affect the next casting. At the same time, the paint itself also has leveling and lubrication. The characteristics of poor wettability lead to insufficient bonding between the sand core and the coating

Method used

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  • Sand core composite coating for casting and application thereof
  • Sand core composite coating for casting and application thereof
  • Sand core composite coating for casting and application thereof

Examples

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Effect test

Embodiment 1

[0041] see Figure 1-2 , a sand core composite coating for foundry, including permanent coating and stripping coating, permanent coating includes the following raw materials in parts by weight: 60-80 parts of silicon micropowder, 15-25 parts of diatomite, 10-25 parts of graphite powder 20 parts, corundum powder 10-16 parts, talc powder 18-22 parts, sodium silicate 15-24 parts, silane coupling agent 5-8 parts, polyisobutylene 10-15 parts, ethanol 20-30 parts and water 20- 30 parts, and the permanent paint is mixed with an extension cap 1 with a mass ratio of 5%-10%;

[0042] The peeling paint includes the following raw materials in parts by weight: 80-100 parts of silica sand, 20-40 parts of mica-like aluminosilicate, 10-15 parts of bentonite, 8-12 parts of flaky graphite powder, 10-16 parts of talcum powder 0.1-0.5 parts of defoamer, 1.2-1.5 parts of suspending agent, 3-5 parts of epoxy resin, 2-4 parts of silica sol, 40-60 parts of water and 3-5 parts of degaussing powder, a...

Embodiment 2

[0057] A composite coating for sand cores for casting, comprising a permanent coating and a stripping coating. The permanent coating includes the following raw materials in parts by weight: 60-80 parts of silicon micropowder, 15-25 parts of diatomite, and 10-20 parts of graphite powder 10-16 parts of corundum powder, 18-22 parts of talc powder, 15-24 parts of sodium silicate, 5-8 parts of silane coupling agent, 10-15 parts of polyisobutylene, 20-30 parts of ethanol and 20-30 parts of water part, and the permanent paint is mixed with an extension cap 1 with a mass ratio of 5%-10%;

[0058] The peeling paint includes the following raw materials in parts by weight: 80-100 parts of silica sand, 20-40 parts of mica-like aluminosilicate, 10-15 parts of bentonite, 8-12 parts of flaky graphite powder, 10-16 parts of talcum powder 0.1-0.5 parts of defoamer, 1.2-1.5 parts of suspending agent, 3-5 parts of epoxy resin, 2-4 parts of silica sol, 40-60 parts of water and 3-5 parts of degaus...

Embodiment 3

[0061] A composite coating for sand cores for casting, comprising a permanent coating and a stripping coating. The permanent coating includes the following raw materials in parts by weight: 60-80 parts of silicon micropowder, 15-25 parts of diatomite, and 10-20 parts of graphite powder 10-16 parts of corundum powder, 18-22 parts of talc powder, 15-24 parts of sodium silicate, 5-8 parts of silane coupling agent, 10-15 parts of polyisobutylene, 20-30 parts of ethanol and 20-30 parts of water part, and the permanent paint is mixed with an extension cap 1 with a mass ratio of 5%-10%;

[0062] The peeling paint includes the following raw materials in parts by weight: 80-100 parts of silica sand, 20-40 parts of mica-like aluminosilicate, 10-15 parts of bentonite, 8-12 parts of flaky graphite powder, 10-16 parts of talcum powder 0.1-0.5 parts of defoamer, 1.2-1.5 parts of suspending agent, 3-5 parts of epoxy resin, 2-4 parts of silica sol, 40-60 parts of water and 3-5 parts of degaus...

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Abstract

The invention discloses a sand core composite coating for casting and application thereof, and belongs to the technical field of casting. An existing sand core coating can be layered and divided into a permanent coating and a stripping coating, the permanent coating is guided by an extension cap under the action of an external magnetic field, and forms high-strength connection with the porous characteristic of a sand core, then the stripping coating is coated before casting, disintegrated microspheres can be autonomously and uniformly dispersed and conduct initial reinforcement on the stripping coating, a stripping layer independent of the permanent coating is formed, isolation between a casting and the sand core is temporarily provided, good plane integrity is achieved, the surface flatness of the casting is improved, after casting is finished, the sand core is slightly knocked, the disintegration microspheres are forced to have brittle fracture behaviors through the resonance action caused by the extension cap, disintegration of the stripping coating is accelerated through expansion of internal gas, and therefore complete and lossless stripping is achieved.

Description

technical field [0001] The invention relates to the technical field of casting, and more specifically relates to a sand core composite coating for casting and its application. Background technique [0002] Casting is a kind of metal thermal processing technology mastered by human beings earlier, with a history of about 6,000 years. China has entered the heyday of bronze castings between 1700 BC and 1000 BC, and the craftsmanship has reached a very high level. Casting is a method in which liquid metal is poured into a casting cavity adapted to the shape of the part, and after it is cooled and solidified, the part or blank is obtained. The material to be cast is mostly a metal that was originally solid but heated to a liquid state (for example: copper, iron, aluminum, tin, lead, etc.), and the material of the mold can be sand, metal or even ceramics. Depending on the requirements, the methods used will vary. [0003] At present, in the molding and core preparation process, ...

Claims

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Application Information

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IPC IPC(8): B22C3/00B22C9/10
Inventor 刘飞杨
Owner 刘飞杨
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