Engine crankshaft and manufacturing method

A manufacturing method and engine technology, applied to crankshafts, shafts, bearings, etc., can solve the problems of many times of fire, difficult forging, and complicated deformation, and achieve the effects of reducing manufacturing costs, ensuring forging accuracy, and reducing the number of deformations.

Inactive Publication Date: 2018-05-11
贵州福润达汽车配件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the integration of the crankshaft and the curved diameter and the continuous forging fibers, the overall forging is difficult and the quality of the forgings is high, so the forging is difficult and the shape is complicated during the forging process.
At present, most of the overall forging crankshafts in China adopt methods such as misalignment and angle preset, but this method is often caused by more fires in the forging process, so the deformation is more complicated, resulting in a low yield rate of the finished product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1. A kind of engine crankshaft, by weight percentage, is made of following raw material:

[0019] C 0.35%~0.5%; Mn 0.3%~1.5%;

[0020] Cr 1.5%~3%; Si 0.15%~1.2%;

[0021] Ni 0.5%~1.2%; Cu 0.1%~0.8%;

[0022] Ti trace ~ 0.2%; B trace ~ 0.05%;

[0023] S trace ~ 0.15%; Al trace ~ 0.08%;

[0024] Mg trace ~ 0.2%; the balance is Fe.

[0025] The manufacture method of aforementioned engine crankshaft is:

[0026] a. Heating the cylindrical billet to 780°C-820°C, keeping it warm for 1-2 hours, and then heating it to 1150-1200°C to elongate it to obtain product A;

[0027] b. Elongate product A again, and then pierce and round again to obtain a crankshaft blank with a forging ratio greater than / equal to 5, namely product B;

[0028] c. Cool the product B with oil; after the oil is cooled, put the product B into a heat treatment furnace and heat it to 840-890°C, keep it warm for 3-5 hours, and then air-cool;

[0029] d. After air-cooling, put it into the heat tr...

Embodiment 2

[0031] Example 2. A kind of engine crankshaft, by weight percentage, is made of following raw material:

[0032] C 0.4%; Mn 0.6%;

[0033] Cr 2%; Si 0.6%;

[0034] Ni 0.8%; Cu 0.3%;

[0035] Ti 0.1%; B 0.02%;

[0036] S 0.06%; Al 0.04%;

[0037] Mg 0.05%; the balance is Fe.

[0038] The manufacture method of aforementioned engine crankshaft is:

[0039] a. Heating the cylindrical blank to 800°C, keeping it warm for 1-2 hours, and then heating to 1180°C to elongate it to obtain product A;

[0040] b. Elongate product A again, and then pierce and round again to obtain a crankshaft blank with a forging ratio greater than / equal to 5, namely product B;

[0041] c. Cool product B with oil; after oil cooling, heat product B into a heat treatment furnace to 860°C, keep it warm for 4 hours, and then air cool;

[0042] d. After air-cooling, put it into the heat treatment furnace again and heat to 300°C for annealing. After annealing, air-cool, and then remove the scale to obtain...

Embodiment 3

[0043] Example 3. A kind of engine crankshaft, by weight percentage, is made of following raw materials:

[0044] C 0.35%; Mn 0.3%;

[0045] Cr 1.5%; Si 0.15%;

[0046] Ni 0.5%; Cu 0.1%;

[0047] Ti trace; B trace;

[0048] Trace S; Trace Al;

[0049] Trace of Mg; balance Fe.

[0050] The manufacture method of aforementioned engine crankshaft is:

[0051] a. Heating the cylindrical billet to 780°C, keeping it warm for 1 hour, and then heating it to 1150°C to elongate it to obtain product A;

[0052] b. Elongate product A again, and then pierce and round again to obtain a crankshaft blank with a forging ratio greater than / equal to 5, namely product B;

[0053] c. Cool the product B with oil; after the oil is cooled, put the product B into a heat treatment furnace to heat to 840°C, keep it warm for 3 hours, and then air-cool;

[0054] d. After air-cooling, put it into the heat treatment furnace again and heat to 200°C for annealing. After annealing, air-cool, and then re...

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PUM

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Abstract

The invention discloses an engine crankshaft and a manufacturing method. The crankshaft comprises the raw materials of, by weight, 0.35%-0.5% of C, 0.3%-1.5% of Mn, 1.5%-3% of Cr, 0.15%-1.2% of Si, 0.5%-1.2% of Ni, 0.1%-0.8% of Cu, trace amount-0.2% of Ti, trace amount-0.05% of B, trace amount-0.15% of S, trace amount-0.08% of Al, trace amount-0.2% of Mg, and the balance Fe. The method has the characteristics of simplifying the heat treatment steps, being simple in process and being low in cost.

Description

technical field [0001] The invention relates to the field of auto parts processing, in particular to an engine crankshaft and a manufacturing method. Background technique [0002] The most important component in the engine. It bears the force transmitted by the connecting rod and converts it into torque through the crankshaft output and drives other accessories on the engine to work. The crankshaft is subjected to the joint action of the centrifugal force of the rotating mass, the periodically changing gas inertial force and the reciprocating inertial force, so that the crankshaft is subjected to the bending torsional load. Therefore, the crankshaft is required to have sufficient strength and rigidity, and the surface of the journal needs to be wear-resistant, work evenly, and have good balance. In order to reduce the mass of the crankshaft and the centrifugal force generated during movement, the crankshaft journal is often made hollow. There are oil holes on the surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C3/06C22C38/04C22C38/02C22C38/42C22C38/50C22C38/54C22C38/06C21D1/18C21D1/26C21D9/30
CPCF16C3/06C21D1/18C21D1/26C21D9/30C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/50C22C38/54F16C2204/72F16C2220/46F16C2223/10
Inventor 王定福
Owner 贵州福润达汽车配件有限公司
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