Quenching agent and method for stub axle

A technology of automobile steering knuckle and quenching agent, which is applied in the direction of quenching agent, heat treatment equipment, furnace, etc., can solve the problem that the steering knuckle of automobile cannot be well satisfied, and achieve the effect of long fatigue life.

Inactive Publication Date: 2005-02-23
上海嘉仕久机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

None of the existing quenching agents and quenching methods can well me

Method used

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  • Quenching agent and method for stub axle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: the preparation of automobile steering knuckle quenching agent stock solution

[0012] Take 20 grams of polyvinyl alcohol, 5 grams of polyacrylate, 5 grams of ammonium persulfate, add 9970 grams of water and heat in a furnace until the polyvinyl alcohol, polyacrylate and ammonium persulfate are completely and uniformly dissolved. Then turn off the heat source, and wait for it to cool to room temperature to obtain the quenching agent stock solution. Concrete embodiment formula sees table (content is percentage by weight):

[0013]

Embodiment 2～3

[0014] Embodiment 2~3: the preparation of automobile steering knuckle quenching agent stoste

[0015] The formula of the stock solution is shown in the table above, and the preparation method is the same as in Example 1.

Embodiment 4

[0016] Example 4: 40Cr steel material with an effective thickness of 40 mm for the steering knuckle journal

[0017] The 40Cr steel steering knuckle workpiece is heated to 860°C in the furnace, kept at this temperature and completely homogenized austenite, and then quenched into water containing 0.30% stock solution (refractive index measured by a refractometer is converted into this concentration value) for cooling In the quenching process, the temperature of the quenching agent is controlled to be lower than 50°C by circulating cooling. After about 10 minutes, the workpiece and the quenching agent reach the same temperature, that is, the core of the workpiece is completely cooled. Take the workpiece out of the coolant, and then measure the Rockwell hardness of the transverse section of the journal. The Rockwell hardness from the edge of the journal to the core is 57-52HRC, indicating that the core has been completely hardened, and then through 580-620℃ Tempered at high tempe...

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Abstract

A quenching medium as cooling medium for vehicle steering node quenching heat treatment and quenching method are disclosed. The quenching medium consists of polyvinyl alcohol, polyacrylic acid salt, ammonium peroxydisulfate and water by proportion through heating polymerizing, cooling and obtaining quenching medium stoste. Heating steering node to austenite state when using, and diluting original solution into different one hundred percent concentration by size, shape and hardening ability of steering node for process of steering node single-phase , stage or double fluid quenching. It is effective for steering node phi<70mm and fatigue life of steering life reaches or above to 500000 times.

Description

technical field [0001] The invention relates to a quenching agent and a quenching method for quenching heat treatment of automobile steering knuckles. Background technique [0002] Regardless of single-liquid quenching, multi-liquid quenching or double-liquid quenching, quenching media are required. Different media will result in different properties of materials obtained by quenching, that is, different mechanical strength and fatigue life. The Chinese patent CN1167158 (1997) applied by Liu Xiangqing disclosed a high molecular polymer quenching agent suitable for high and medium steel carbon wire products, which consisted of 20-45% acrylic acid, 15-40% caustic soda, and 0.3-1.5 ammonium persulfate %, water 20~40% (by weight percentage) composition. The method disclosed in the Chinese patent CN1398992 (2002) applied by Shanghai Jiaotong University is to select the quenching cooling medium according to the size of the workpiece and the hardenability of the steel, and to adju...

Claims

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Application Information

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IPC IPC(8): C21D1/60C21D9/00
Inventor 龚应时
Owner 上海嘉仕久机械制造有限公司
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