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Preparation method of anti-fracture engine crankshaft

An engine and anti-fracture technology, which is applied in the direction of manufacturing tools, heat treatment equipment, furnace types, etc., can solve the problems of industrial production hazards, difficulty in ensuring strength, and fracture of rods, and achieve the effects of not easy to break, high production efficiency, and improved life.

Inactive Publication Date: 2016-03-23
HEFEI HAIYUAN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current processing method of the engine crankshaft is generally turning and forming, and the strength is often difficult to guarantee. Sometimes unsafe phenomena such as U-turn and rod breakage occur during use, which is very harmful to industrial production.

Method used

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Embodiment Construction

[0014] The present invention will be further described in conjunction with the following examples:

[0015] A method for preparing a fracture-resistant engine crankshaft, the processing steps comprising:

[0016] a. For casting crankshaft blanks, the weight percentage of each chemical composition of the crankshaft blanks should meet the following requirements: C2.41, Mn1.2, Si0.5, W0.025, P0.015, S0.01, Bi0.2, Cr2.45, Sn0.2, V0.11, Li0.03, the balance is iron;

[0017] b. For the first time, heat the crankshaft at 550-650°C for 5-6 hours, then raise the temperature to 980-1020°C within 40-50 minutes, keep the heating time for 20-30 minutes, quench with quenching oil, and then quench Afterwards, temper the crankshaft at 500-520°C for 30-40 minutes, then take it out of the tempering furnace and put it in tempering oil at 340-370°C and cool it slowly with the oil; the second time is to put the crankshaft at 700°C±20 ℃, quenching with water-based quenching liquid, and then tempe...

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Abstract

The invention discloses a preparation method of an anti-fracture engine crankshaft. The preparation method comprises the steps that a rod blank is cast; and chemical components of the rod blank are made to meet the requirement that the rod blank is composed of, by weight, 0.28-0.35% of C, 0.25-0.35% of Mn, 0.15-0.35% of Si, 0.01-0.04% of W, 0-0.025% of P, 0-0.035% of S, 0.55-1.20% of Ni, 0.35-0.45% of Co, 0.20-0.30% of Sn, and 0-0.20 of Al. By means of the preparation method, the strength of the engine crankshaft is improved, the hardness value and the strength value which are required by a high-strength engine crankshaft are reached, the problems of delayed fracture and fatigue fracture of the engine crankshaft under high strength are solved, connection is reliable when the engine crankshaft is in use, fracture is unlikely to occur, the service life of the engine crankshaft is prolonged, and using requirements of various industries in the society for the high-strength engine crankshaft are met.

Description

technical field [0001] The invention relates to a bolt processing method, in particular to a method for preparing a fracture-resistant engine crankshaft. Background technique [0002] Most connecting rods are made of medium carbon steel and low alloy steel. Domestic traditional connecting rod blank materials generally use 42CrMo, 35CrMo, 40MnVB, 45CrMnB and other quenched and tempered steels and S43CVS1, 35MnV, 40MnS and other non-quenched and tempered steels. In terms of processing technology, the production methods of connecting rods at home and abroad generally include: forging, casting, powder metallurgy, etc. This year, die forging technology is used in the manufacturing of connecting rods. [0003] The current processing method of the engine crankshaft is generally turning and forming, and the strength is often difficult to guarantee. Sometimes unsafe phenomena such as U-turn and rod breakage occur during use, which is very harmful to industrial production. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/04C22C38/02C22C38/12C21D6/00C21D9/30C23C8/22
CPCC22C38/18C21D6/002C21D6/005C21D6/008C21D9/30C22C38/002C22C38/008C22C38/02C22C38/04C22C38/12C23C8/22
Inventor 沈四海沈军
Owner HEFEI HAIYUAN MACHINERY
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