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Method for producing shot blasting machine blades by composite shell investment casting using chilled surface coating

A shot blasting machine blade and investment casting technology, which is applied in casting molding equipment, coatings, casting molds, etc., can solve the problems of low surface hardness, poor thermal conductivity, and poor wear resistance of shot blasting machine blades, and achieve accelerated cooling and solidification Speed, long service life, and the effect of improving mechanical properties

Active Publication Date: 2011-12-28
SHANDONG KAITAI SHOT BLASTING MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] Although the investment casting process is used to produce shot blasting machine blades, despite the above advantages, because the shell of investment casting is made of refractory materials such as quartz sand powder or mullite sand as a refractory base material, silica sol or water glass is added. It is made of chemical agent and has extremely poor thermal conductivity, which inevitably leads to low surface hardness and poor wear resistance of shot blasting machine blades produced by this method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Melting of molten iron: Add scrap steel, high-carbon ferrochromium, and ferromolybdenum into the induction furnace, and the furnace charge is completely melted, then add electrolytic copper, add rare earth silicon alloy 5 to 10 minutes before the furnace is released, and release it at about 1500 °C; Spectral analysis, its chemical composition is as follows (mass fraction, %):

[0046] C Si mn P S Cr Mo Cu 3.23 0.78 0.73 0.021 0.02 20.47 0.71 0.85

[0047] (2) Shell preparation:

[0048] (1) Wax mold making:

[0049] Take out the wax cylinder from the heat preservation tank and install it on the double-station hydraulic wax mold injection machine. Before use, the air and hard wax in the wax material should be removed;

[0050] Position the mold on the working table of the injection machine, check whether all the cores of the mold are in the correct position, and whether the wax injection port of the mold is aligned with the injecti...

Embodiment 2

[0139] Prepare the shell, after melting the molten iron, perform the following steps in the shell preparation: making wax molds, making gate molds, repairing wax molds, repairing molds, welding wax molds, making surface shells, and making back layers Shell, dewaxing, equipment preparation, shell repair, roasting. In each of the above steps, the melting of molten iron and preparing the wax mold in the shell, making the gate mold, repairing the wax mold, repairing the mold, welding the wax mold, dewaxing, equipment preparation, shell repair, and roasting all adopt conventional methods The outstanding feature of this embodiment is that the step of coating paint on the surface shell and the back shell is added after the welding wax pattern is assembled.

[0140] Wherein the surface layer shell making comprises the following steps:

[0141] ① Add silica sol into the paste machine, start the paste machine, add the wetting agent n-butanol, add it at a ratio of 1.6 ml per kg of silic...

Embodiment 3

[0164] The difference from Example 2 is that in this embodiment, the number of coating layers of the top coat paint is 4 layers, the number of coating layers of the back coat paint is 3 layers, and the others are completely the same.

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Abstract

The invention, which belongs to the metal wear resistant part and casting technology field, more particularly relates to a method for casting and producing a shot blasting machine blade based on firing mold on a composite shell with utilization of chilled surface layer paint. The method comprises the following steps: manufacture on a wax mould; manufacture on a pouring gate mould; renovation of the wax mould; assembly and welding of the wax mould; dewaxing; and roasting. The method is characterized in that a step of coating paint on a composite shell is added between the step of assembly and welding of the wax mould and the step of dewaxing. The added step comprises particularly the following steps: coating silica solution surface layer paint on surface layer type shell of the composite shell and coating water glass reinforcing layer paint on a back layer shell. According to the shot blasting machine blade produced by the method, a mechanical property of the blade is improved, so thatservice life of the blade is improved; meanwhile, an amorphous glass phase is formed between the shell and the casting surface, so that it is convenient for the amorphous glass phase to be shed from the casting surface during cleaning sand.

Description

technical field [0001] The invention belongs to the technical field of casting of metal wear-resistant parts, and in particular relates to a method for producing shot blasting machine blades by coating paint investment casting on a composite shell. Background technique [0002] Since the first shot blasting machine was made in the world by the American Wheelabrator company in the 1930s, the shot blasting machine is generally used for sand cleaning of castings, and now its application field is expanding and has been widely used. It is used in the treatment of metal parts in casting, forging, heat treatment, shipbuilding, steel structure, pipeline anticorrosion, bridge and other industries. With the expansion of the application range of shot blasting machines, all walks of life have higher and higher requirements for the performance of shot blasting machines. [0003] As a key component of the shot blasting machine, the quality and service life of the shot blaster directly de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/22B22C3/00
Inventor 翟永真王守仁王瑞国
Owner SHANDONG KAITAI SHOT BLASTING MACHINERY
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