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Large power engine crankshaft and manufacturing method

A manufacturing method and engine technology, applied in directions such as crankshafts, can solve problems such as high material cost and achieve the effect of improving mechanical properties

Active Publication Date: 2014-06-04
SICHUAN CRRC YUCHAI ENGINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most domestic high-power engine crankshaft materials are made of alloy steel, such as: 42CrMo, 40CrNiMo, etc., and the material cost is expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. A high-power engine crankshaft, which contains the following components and weight percentages:

[0046] C: 0.42%, Si: 0.15%, Mn: 0.50%, Cr: 0.15%, Ni: 0.15%, Mo: 0.01%, and the balance is iron and unavoidable impurities.

[0047] 2, the manufacture method of above-mentioned high-power engine crankshaft, comprises the following steps:

[0048] (1) Crankshaft blank: The crankshaft blank is made of refined or vacuum-treated killed steel, or electroslag remelted steel. The composition of the killed steel or electroslag remelted steel should meet the above composition requirements. Less than 4, after the blank is forged, annealing or normalizing + high temperature tempering treatment is carried out, the normalizing: heating temperature 830°C, heat preservation for 8 hours; the high temperature tempering treatment: tempering temperature 630°C, tempering time After 20 hours, take a sample at the 1 / 2R side of the riser end of the steel ingot, conduct a mechanical performan...

Embodiment 2

[0057] 1. A high-power engine crankshaft, which contains the following components and weight percentages:

[0058] C: 0.50%, Si: 0.37%, Mn: 0.90%, P: 0.035%, S: 0.035%, Cr: 0.30%, Ni: 0.40%, Mo: 0.15%, Cu: 0.20%, and the balance is iron and unavoidable impurities.

[0059] 2, the manufacture method of above-mentioned high-power engine crankshaft, comprises the following steps:

[0060] (1) Crankshaft blank: The crankshaft blank is made of refined or vacuum-treated killed steel, or electroslag remelted steel. The composition of the killed steel or electroslag remelted steel should meet the above composition requirements. Less than 4, after the blank is forged, annealing or normalizing + high temperature tempering treatment is carried out, the normalizing: heating temperature 870 ° C, heat preservation for 10 hours; the high temperature tempering treatment: tempering temperature 670 ° C, tempering time 25 Hours, samples were taken at the 1 / 2R side of the riser end of the steel...

Embodiment 3

[0069] 1. A high-power engine crankshaft, which contains the following components and weight percentages:

[0070] C: 0.44%, Si: 0.15%, Mn: 0.6%, P: 0~0.2%, S: 0~0.02%, Cr: 0.20%, Ni: 0.20%, Mo: 0.01%, Cu: 0~0.1% , and the balance is iron and unavoidable impurities.

[0071] 2, the manufacture method of above-mentioned high-power engine crankshaft, comprises the following steps:

[0072] (1) Crankshaft blank: The crankshaft blank is made of refined or vacuum-treated killed steel, or electroslag remelted steel. The composition of the killed steel or electroslag remelted steel should meet the above composition requirements. Less than 4, after the blank is forged, it is annealed or normalized + high temperature tempering treatment, the normalizing: heating temperature 840 ° C, heat preservation for 9 hours; the high temperature tempering treatment: tempering temperature 640 ° C, tempering time 20 Hours, samples were taken at the 1 / 2R side of the riser end of the steel ingot, and ...

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Abstract

The invention discloses a large power engine crankshaft, which comprises the following ingredients by weight percentage: 0.42-0.50% of C, 0.15-0.37% of Si, 0.50-0.90% of Mn, 0-0.035% of P, 0-0.035% of S, 0.15-0.30% of Cr, 0.15-0.40% of Ni, 0.01-0.15% of Mo and 0-0.20% of Cu. According to the invention, chemical ingredients are designed in a reasonable mode, thereby the mechanical properties can be obviously enhanced, the requirements for producing production large power engine crankshaft can be guaranteed under the condition of low cost, the crankshaft can be widely used for the technical fields of locomotive diesel engines, ship diesel engines, gas engines and the like, and the invention provides the large power engine crankshaft with characteristics of enough fatigue strength, bending rigidity, service life, torsion rigidity and good work uniformity for the engines after reducing the cost.

Description

technical field [0001] The invention relates to a high-power engine crankshaft. The utility model belongs to the field of rotating moving parts of an engine. It relates to technical fields such as a locomotive diesel engine crankshaft, a marine diesel engine crankshaft, and a gas engine crankshaft. Background technique [0002] At present, diesel engines are widely used in locomotives, ships, power stations and other fields. The crankshaft is the main component that transmits power in the engine. The function of the crankshaft is to convert the reciprocating motion of the piston into a rotary motion through the connecting rod to output the power generated by the engine and drive the engine's valve train, fuel injection pump, oil pump, and water pump. and other accessories. [0003] At present, most domestic high-power engine crankshaft materials are made of alloy steel, such as: 42CrMo, 40CrNiMo, etc., and the material cost is expensive. The invention designs a reasonabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C21D8/00F16C3/06
Inventor 张伟华杨军苏程黄国刚
Owner SICHUAN CRRC YUCHAI ENGINE CO LTD
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