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Leadless copper alloy for amiable cutting smithing

A lead-copper alloy and forging technology, which is applied in the field of lead-free copper alloy for free-cutting forging, can solve the problems of high production cost, poor alloy grinding and polishing performance, hard points, etc., and achieve long service life, beautiful appearance, clear shape effect

Inactive Publication Date: 2008-08-27
ZHUHAI EDISON ECOTECH CORP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] In the above-mentioned existing alloys, the main focus is only on solving the cutting performance of replacing lead brass, making other performances unsatisfactory
Because the alloy contains very expensive bismuth, the production cost is high
And when producing recast products, the crystal grains are fine, the performance is not ideal, and the shape is not beautiful
Since most water heating and sanitation products require polishing and electroplating, the products must be ground and polished before electroplating. However, the grinding and polishing performance of the above-mentioned alloys is poor, and there are often inclusions, cracks, and hard spots on the grinding and polishing surface.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A lead-free copper alloy for free-cutting and forging, the weight percentage of the alloy is: Cu: 57.80%; Pb: 0.04%; Si: 0.31%; Bi: 0.71%; Fe: 0.19%; Ni: 0.18%; Sn : 0.16%; Zn: margin; product specification: bar: φ26±0.1(mm); state: semi-hard;

[0029] Inspection items: 1. Surface quality: no cracks, bruises, car jump marks and other defects, qualified;

[0030] 2. Specification size and tolerance: φ25.98, qualified;

[0031] 3. Hardness: Brinell hardness: HB 89, qualified;

[0032] 4. Chemical composition: qualified;

[0033] During the casting process, the fluidity of the copper liquid was good, and no hard spots and other defects were found; no rotten teeth were found at the water outlet during machining; no cracks were found in the material during grinding and polishing; no cracks were found in the material after electroplating. crack phenomenon.

Embodiment 2

[0035] A lead-free copper alloy for free-cutting and forging, the weight percent of the alloy is composed of: Cu: 57.50%; Pb: 0.035%; Si: 0.3%; Bi: 0.91%; Fe: 0.20%; Ni: 0.19%; Sn : 0.11%; Zn: margin; product specification: bar: φ35±0.1(mm); state: semi-hard;

[0036] Inspection items: 1. Surface quality: no cracks, bruises, car jump marks and other defects, qualified;

[0037] 2. Specification size and tolerance: φ35.03, qualified;

[0038] 3. Hardness: Brinell hardness: HB 105, qualified;

[0039] 4. Chemical composition: qualified;

[0040] During the casting process, the fluidity of the copper liquid was good, and no hard spots and other defects were found; no rotten teeth were found at the water outlet during machining; no cracks were found in the material during grinding and polishing; no cracks were found in the material after electroplating. crack phenomenon.

Embodiment 3

[0042] A lead-free copper alloy for free-cutting and forging, the weight percent of the alloy is composed of: Cu: 59.01; Pb: 0.025; Si: 0.41; Bi: 1.21; Fe: 0.05; Ni: 0.08; Sn: 0.20; Quantity; product specifications: bar: φ30±0.1(mm); state: semi-hard:

[0043] Inspection items: 1. Surface quality: no cracks, bruises, car jump marks and other defects, qualified;

[0044] 2. Specification size and tolerance: φ29.95, qualified;

[0045] 3. Hardness: Brinell hardness: HB 103, qualified;

[0046] 4. Chemical composition: qualified;

[0047] During the casting process, the fluidity of the copper liquid was good, and no hard spots and other defects were found; no rotten teeth were found at the water outlet during machining; no cracks were found in the material during grinding and polishing; no cracks were found in the material after electroplating. crack phenomenon.

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Abstract

The invention relates to a lead-free copper alloy which is easy to cut and forge, which relates to a low-lead brass alloy pipe and steel bar which are used in various hot-water heating, sanitary spare parts and equipment which is forged or is directly processed and produced in hot-water heating industry and sanitary industry. The invention is characterized in that the percentage by weight composition of alloy comprises Cu 57.5%-59.0%, Fe 0.05%-0.2%, Si 0.3%-0.4%, Bi 0.7%-1.2% and the allowance is zinc and unavoidable impurity, wherein Pb<=0.05, Sn<=0.2%, Ni<=0.2%. The alloy component of lead-free copper alloy which is easy to cut and forge of the invention is on the basis of copper and adds main elements such as proper zinc, antimony, bismuth, aluminium, iron and the like, which strictly controls impurity component, easy-cutting brass alloy material for casting which is produced is particularly suitable for various hot-water heating, sanitary components and equipment, and the products have the advantages of aesthetic appearance, compact structure, clean shape and bright color, copper alloy pipe and steel bar which are produced by the lead-free recasting copper alloy are particularly applicable for processing vehicles, milling, grinding, polishing, welding, electroplating and the like besides the above advantages, and has the advantages of corrosion prevention, long service span and the like.

Description

technical field [0001] A lead-free copper alloy for easy cutting and forging, relating to low-lead brass alloy tubes and rods used for forging or direct machining for various water heaters, bathroom parts and equipment in plumbing, bathroom and other industries . Background technique [0002] Due to its excellent casting performance, machine grinding and polishing performance, electroplating performance and corrosion resistance, copper alloy has been widely used in various water heating, sanitary parts and equipment manufacturing fields for a long time, with long service life and good performance. [0003] For many years, the copper alloy used in the manufacture of various water heaters, sanitary parts and equipment is usually a lead brass alloy material containing 1% to 3.5% lead. Because the lead brass alloy contains a certain amount of lead, it has good machinability. Therefore, leaded brass has always been used for forging or direct machining into some water heaters, o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/04
Inventor 糜洪国毛岳山张伟建
Owner ZHUHAI EDISON ECOTECH CORP CO LTD
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