Surface sand for precise casting and preparation thereof

A technology of precision casting and surface layer, which is applied to casting molding equipment, casting molds, manufacturing tools, etc. It can solve the problems of low reserves and high prices, and achieve the effects of easy shelling, low price, and surface quality protection

Inactive Publication Date: 2011-01-05
黄九连
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its small reserves in the earth's crust, it is expensive, and people have

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: adopt precision casting part of the present invention: " gun part ", rough blank weighs 1.2kg, and material is 4140 (U.S. trade mark), selects the material of making surface layer sand for use: base material quartz sand (70-120 order) 100kg, Additive NaHCO 3 3kg, tap water 12kg. The preparation process is to pour 100kg of quartz sand (70-120 mesh) and 3kg of NaHC into the sand mixer and dry mix for 3-5 minutes, then pour 12kg of tap water, continue mixing for 3-5 minutes, and finally take out the mixture and place it in the furnace Dry at 200-250°C, and sieve to obtain the required surface sand. When in use, the surface layer sand directly replaces the zircon sand in the original process for the production of the above-mentioned "gun parts". The shell making, dewaxing, and roasting are equivalent to the original process, and will not be described again. Using this embodiment, the cast casting is sand-cleaned smoothly, and the surface inspection shows...

Embodiment 2

[0017] Embodiment 2: Using the precision casting part "panel" of the present invention, the blank weighs 1.1kg and the material is 304 (American brand), and the material base material for making the surface sand is 70kg of quartz sand (70-120 mesh), zircon sand ( 80-120 mesh) 30kg; additive KOH 3kg, NaOH 3kg; tap water 10kg. The preparation process is to pour 70kg of quartz sand, 30kg of zircon sand, 2kg of KOH, and 3kg of NaOH into the sand mixer for dry mixing for 3-5 minutes, pour 10kg of tap water and continue mixing for 3-5 minutes, and finally take out the mixture and place it in the furnace Dry at 200-250°C and sieve into the required surface sand. Its using method, effect are all identical with embodiment 1.

Embodiment 3

[0018] Embodiment 3: Use the technology of the present invention to precision cast the part "seat", the blank weighs 1.3kg, and the material is 316 (US brand), and the material base material for making the surface sand is 50kg of quartz sand (70-120 mesh), fused silica Sand (100-160 mesh) 25kg, zircon sand (80-120 mesh) 25kg, additive is K 3 PO 4 2kg, K 2 CO 3 2kg, tap water 11kg, its preparation process, method of use are identical with embodiment 1, embodiment 2.

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Abstract

The invention discloses surface sand for precise casting and a preparation process thereof. The surface sand is prepared by mixing low-cost quartz sand serving as a base material and one or more water-soluble alkaline compounds serving as additives and drying the mixture and is used for substituting expensive zircon sand and producing various engineering parts or shoe making moulds and the like by precise casting so as to completely achieve the quality effect of the zircon sand and greatly reduce production cost.

Description

technical field [0001] The invention relates to casting technology and technology, in particular to surface sand for precision casting and its preparation method. Background technique [0002] In the precision casting process, the production of the shell is very important. It is necessary to make multiple layers of refractory sand, the innermost layer of which is the surface sand, which not only affects the high temperature thermochemical stability of the shell, but more importantly, it will directly affect the casting. surface quality. At present, the surface sand used in precision casting is mainly composed of zirconium silicate (or zircon sand, zircon sand). Due to the good thermal shock stability of zircon sand, whether it is used for precision casting of carbon steel or stainless steel, the surface quality of the castings is better, so it has always dominated the precision casting surface refractory material (ie surface sand). However, due to its small reserves in th...

Claims

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Application Information

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IPC IPC(8): B22C1/02
Inventor 黄九连
Owner 黄九连
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