Zinc-based alloy pellets

Abstract

The present invention aims to provide a zinc base alloy pellet which is used in surface treatments of deflashing, grinding and cleaning for aluminium die-casting products and magnesium die-casting products through shot peening, is excellent in unit cost rate, does not reduce corrosion resistance of zinc base alloy, and is corresponding to treated products in surface hardness. The zinc base alloy pellet is characterized by being a three-component system zinc base alloy pellet comprising additive elements of 1.800-6.000 mass % of Cu and 0.0010-0.5000 mass % of Fe, the balance being zinc and unavoidable impurities, by that the Vickers hardness of the pellet is 80-110 HV, and that purity of the additive element Cu is higher than 99.9 mass%. The zinc based alloy pellets is applied to shot peening for aluminum die-casting and magnesium alloy die-casting.

Description

technical field [0001] The present invention relates to shot blasting for the purpose of deburring, grinding and sweeping of non-ferrous metal parts, and shakeout of castings. [0002] In more detail, the present invention relates to the removal of burrs and oxide scales of die-casting and casting products made of light alloys such as aluminum-based alloys or magnesium-based alloys, the removal of coatings of metal products, the removal of sticky sand of release agents, or Zinc-based alloy pellets used in projection processing for oxide film and waviness removal, and blasting. Background technique [0003] Conventionally, in order to perform surface treatment for the purpose of deburring, grinding, etc., of die-cast products used in automobile parts, etc., shot blasting, in which small balls called shot are projected at high speeds on the product, has been commonly used. [0004] As a material of the shot used for this shot peening, an aluminum-based alloy, stainless steel,...

AI Technical Summary

Problems solved by technology

Here, if the pellets are too soft, the productivity of deflashing or grinding is low

On the other hand, too hard pellets have problems such as short life and damage to processed products.

That is, in the zinc-based alloy pellets, when the Vickers hardness is lower than 60HV, the deburring ability and the grinding and sweeping ability are insufficient, and when it exceeds 150HV, the zinc-based alloy pellets are prone to cracking when deburring and grinding. Breakage, loss, increased consumption of pellets

[0011] However, the Cu content in the zinc of the pellets described in Patent Document 2 is 1.8 to 13.0%.

However, the price of Cu is higher than that of Zn, so if the content of Cu is too large, there is a problem that the price of the pellets will increase.

[0012] In addition, when conventional zinc-based alloy pellets are used, there is a problem that blackening occurs on the surface of the treated product after projection.

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