Aluminum alloy rolled material

A technology for rolling materials and aluminum alloys, applied in the field of 6000 series aluminum alloy rolling materials, can solve problems such as uncontrollable structure and morphology, and achieve the effects of suppressing poor spot appearance, excellent strength and stamping workability
CN105316545BActive Publication Date: 2018-03-23SHIMANO INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHIMANO INC
Publication Date
2018-03-23

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Abstract

The present invention provides an aluminum alloy rolled material that is excellent in strength and press workability, and is less likely to suffer from blotchy appearance defects even after alumite treatment. An aluminum alloy rolling material used in crank parts of bicycles, having the following composition: 0.6-1.4 mass % of Mg, 0.3-1.0 mass % of Si, 0.1-0.5 mass % of Cu, 0.02-0.4 mass % % Cr, 0.1 to 0.6 mass % Mn, and the remainder consists of Al and unavoidable impurities.
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Description

technical field

[0001] The present invention relates to an aluminum alloy rolled material used in crank parts of bicycles. More specifically, it relates to a 6000 series aluminum alloy rolled material. Background technique

[0002] Conventionally, extruded and forged aluminum alloys have been used for crank parts of bicycles. However, in recent years, as bicycles have become popular, the number of crank parts manufactured has increased. In order to reduce costs, crank parts using rolled materials have been studied. When manufacturing crank parts using rolled materials, if a high-strength aluminum alloy sheet is directly press-worked, cracks and the like may occur, and the specified quality may not be obtained. Therefore, the following process is sometimes performed. First, a soft material (O-state material (called "O material" in Japanese) is used as a raw material to perform stamping processing to obtain a crank-shaped molded part, and then in order to improve the strength...

Claims

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