Process for producing brake piston

A manufacturing method and brake technology, which are applied to pistons, manufacturing tools, furnaces, etc., can solve the problems of poor manufacturing efficiency and many processes, and achieve the effects of good manufacturing efficiency, lower energy costs, and good machinability.

Inactive Publication Date: 2012-09-19
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the number of steps is large and the manufacturing efficiency is poor.

Method used

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  • Process for producing brake piston
  • Process for producing brake piston
  • Process for producing brake piston

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～13

[0107] The rod-shaped ingot was corrected by nipping with a straightening roll without performing homogenization treatment 3 days after casting (72 hours later). The straightened rod-shaped ingot is peeled, and the inspected rod-shaped ingot is cut to a desired thickness and formed into a short cylinder, which is used as a forging blank (2).

[0108] The blank for forging (2) is treated with phosphate, without annealing, such as Figure 5 As shown, cold forging was carried out 7 days after casting (after 168 hours) to form a cup-shaped brake piston (1). Table 2 shows the processing ratio in cold working as any one of 25%, 50%, and 71%.

Embodiment 14、15

[0110] A cup-shaped brake piston ( 1 ) was molded by the same process as in Example 1 except that the timing of straightening and cold forging was changed as described in Table 2.

[0111] The molded brake piston was not subjected to solution treatment, but was aged at 175°C for 2 hours, and machined to improve the dimensional accuracy of the inner diameter and outer diameter.

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Abstract

A brake piston having required mechanical strength is produced through fewer steps than in conventional processes. An aluminum alloy containing Si and Mg, wherein the aluminum alloy has a Si concentration (CSi mass%) and a Mg concentration (CMg mass%) falling within a range surrounded by four points A (0.75, 1.25), B (1.4, 1), C (1.4, 0.6), and D (0.75, 0.85) in terms of a relationship thereof (CSi , CMg ), and further has a Cu concentration of 0.07 to 0.9 mass%, a Mn concentration of 0.1 to 0.9 mass%, a Ti concentration of 0.005 to 0.15 mass%, a Cr concentration of 0.2 mass% or less, and a Fe concentration of 0.5 mass%, the balance being Al and inevitable impurities is cast to obtain a rod-shaped ingot. The rod-shaped ingot, without being subjected to a homogenization treatment, is straightened within 3 (three) days after the casting. The straightened rod-shaped ingot is cut into a given thickness to obtain a forging raw material. This forging raw material, without being subjected to annealing, is cold-forged at a reduction rate of 25 to 90% within 7 (seven) days after the casting of the rod-shaped ingot into a cup shape, which is subjected to age-hardening without being subjected to a solution heat treatment.

Description

technical field [0001] The invention relates to a method of manufacturing a brake piston using cold forging. Background technique [0002] In recent years, brake pistons made of aluminum alloys have been used in disc brakes of vehicles such as four-wheeled vehicles and two-wheeled vehicles in order to improve performance and reduce fuel consumption. Brake pistons are sliding parts that require excellent mechanical strength. figure 1 The shown cup-shaped brake piston (1) is an example (see Patent Document 1). In the manufacture of such cup-shaped brake pistons, conventionally, a rod-shaped billet that has been extruded and then drawn out is subjected to solution treatment, and then subjected to aging treatment to obtain the required mechanical strength, and then mechanically processed. Shape into a cup shape. [0003] However, since the material yield is extremely poor in the above-mentioned manufacturing method, it has been proposed to improve the material yield by utiliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/05B21J5/00B21K1/18B22D11/00B22D11/20C22C21/02C22C21/06
CPCC22F1/05B21K1/18C22F1/047B22D21/007C21D9/0068C22C21/02C22F1/043B21J5/00C22C21/08B22D11/003F16D2125/06F16D2200/003B22D11/00
Inventor 冈本康夫
Owner SHOWA DENKO KK
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