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Cu-zn system alloy with good of durable crack resistant performance and manufacturing method thereof

A technology of anti-crack performance and manufacturing method, which is applied in the field of high-proportion zinc alloy, and can solve problems such as long-term cracks, reduced material strength, and difficulty in using plant-mounted components.

Active Publication Date: 2004-11-03
YKK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the aforementioned method of preventing stress corrosion cracking by annealing, the strength of the material is reduced due to the necessity of heat treatment, and in addition, it is difficult to apply it to elements such as zipper tapes such as zipper products.
[0009] In the case of using in a deformed state, even if there is no load stress caused by the use environment, there may be almost no effective means to solve the long-term cracks that occur

Method used

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  • Cu-zn system alloy with good of durable crack resistant performance and manufacturing method thereof
  • Cu-zn system alloy with good of durable crack resistant performance and manufacturing method thereof

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Embodiment 1～13

[0057] Use pure Cu (99.99%), pure Zn (99.9%), pure Al (99.9%), pure Si (99.9%), pure Sn (99.9%), and pure Mn (99.9%) as raw materials, weigh out Table 1 or The prescribed composition shown in Table 2. Put it in an aluminum crucible, melt it at high frequency in argon, and then pour it into a copper mold of φ40mm to make an ingot. The obtained ingot was cut into a length of 75 mm to form a billet for extrusion. Extrusion was performed at a billet temperature of 800°C and an extrusion molding die temperature of 530°C to produce an extruded material with a diameter of 26 mm. The obtained extruded material was subjected to a homogenization treatment at 800°C for 1 hour.

[0058] The homogenized material is turned into a φ6mm round rod, then cold pressed to a thickness of 1.2mm, and 80% of the calendering deformation is added (the same amount of deformation is given when forming the zipper element) . The calendered sheet was made into a tensile test piece according to JIS Z 2201 No. 7 ...

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Abstract

Provided is a Cu-Zn alloy which has a high Zn content, can be cold-worked, and has high strength and superior season cracking resistance. A cold-worked Cu-Zn alloy containing at least 10% Zn is subjected to at least one treatment selected among shot peening, shot blasting, sand blasting, and steel ball shot blasting; thus, the tensile residual stress on the surface of the alloy is reduced or brought into the state of compressive residual stress. The Cu-Zn alloy has a composition expressed by the general formula: CuaZnbXc (wherein X is at least one element selected among Al, Si, Sn, and Mn; and, by mass%, a is the balance, 10 C22C 9 / 04 C22F 1 / 08 2 10 1 2003 / 12 / 9 1542150 2004 / 11 / 3 1250757 2006 / 4 / 12 2006 / 4 / 12 2006 / 4 / 12 YKK Corp. Japan Koizumi Takuya Yoshimura Taiji Kita Kazuhiko he tengyun 11038 The Patent Agency of the Chinese Council for the Promotion of International Trade (CCPIT) No.1 Waidajie, Fuxingmen, Beijing 100086 Japan 2003 / 5 / 1 126292 / 2003

Description

Technical field [0001] The present invention relates to, for example, a high-proportion zinc alloy with excellent strength and long-lasting crack resistance, and a method for manufacturing the same, which is suitable for decorations such as zipper elements, sliders, buckles, etc., or metal buttons, and wearing fasteners. Background technique [0002] Existing copper alloys for slide fasteners use alloys such as copper-zinc alloys represented by red brass and brass, or zinc-nickel alloys. Zinc, which is an alloy element used in these alloys, has the effect of increasing alloy strength, hardness, and uniform deformation due to solid solution. In addition, since zinc is cheaper than copper, a cheap alloy with good properties can be obtained. [0003] However, due to the presence of zinc in copper, there is a problem of significantly degrading corrosion resistance. The use of copper alloys with a relatively large zinc ratio, especially when the zipper is manufactured by cold working ...

Claims

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Application Information

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IPC IPC(8): C22F1/08C22C9/04C22F1/00
CPCC22C9/04C22F1/08
Inventor 小泉琢哉吉村泰治喜多和彦
Owner YKK CORP
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