Fillet rolling nodular cast iron crankshaft and machining technology thereof

A technology of filleting and rolling, which is applied in the direction of the crankshaft, can solve the problems of high price, poor reliability and wear resistance, and achieve the effect of improved roughness of finished products, high impact value and reduced cost

Inactive Publication Date: 2012-11-14
DEUTZ DALIAN ENGINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, domestic medium and heavy engines use forged steel nitriding or forged steel quenched crankshafts. Forged steel quenched crankshafts are characterized by high strength, but relatively poor reliability and wear resistance, and are expensive

Method used

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  • Fillet rolling nodular cast iron crankshaft and machining technology thereof
  • Fillet rolling nodular cast iron crankshaft and machining technology thereof
  • Fillet rolling nodular cast iron crankshaft and machining technology thereof

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Experimental program
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Embodiment Construction

[0016] The structure of the forged steel large fillet quenching crankshaft in the prior art is as follows: figure 1 and image 3 As shown, including the main journal 2 and the connecting rod journal 3, the main journal 2 and the connecting rod journal 3 are installed between the crank arm 1, the fillet 4 of the main journal and the connecting rod journal is R5, and the journal and the fillet are used The overall quenching process, the thickness of the hardened layer 8 is 2.0~5.0mm, the fillet to the push block is not less than 5.5mm, and the rest of the block is not less than 5mm to ensure that the boss is hardened. Due to this large fillet structure, part of the material is higher than the surface of the journal during the rolling process, and the reliability and wear resistance are relatively poor, so the use of forged steel materials is expensive.

[0017] The structure of the rounded rolling nodular iron crankshaft of the present invention is as figure 2 and Figure 4 ...

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Abstract

A fillet rolling nodular cast iron crankshaft is made of QT800-6 nodular cast iron materials and has a high elongation rate and a higher impact value. Rolling force can be effectively improved, transition fillets of a main journal, a rod journal and a crank arm are of undercutting groove structures, critical sizes such as linearity and cylindricity of the main journal and the rod journal can be effectively ensured, and swelling of journal surfaces caused by flow of parts of materials is prevented in the rolling process. By the aid of the strengthening technology of 'journal quenching and fillet rolling', the fillet rolling nodular cast iron crankshaft can obtain high fatigue bending moment performance, the fatigue bending moment performance of the fillet rolling nodular cast iron crankshaft exceeds that of a forged steel nitriding crankshaft and approaches to the level of a forged steel quenching crankshaft, reliability can be ensured, and cost can be remarkably reduced.

Description

technical field [0001] The invention relates to the field of engine equipment, in particular to a crankshaft for an engine. Background technique [0002] At present, domestic medium and heavy engines use forged steel nitriding or forged steel quenched crankshafts. Forged steel quenched crankshafts are characterized by high strength, but relatively poor reliability and wear resistance, and are expensive. Contents of the invention [0003] In order to overcome the above-mentioned problems existing in the traditional forged steel nitriding or forged steel quenching crankshaft, the present invention provides a rounded rolled nodular iron crankshaft with high reliability and low cost. [0004] The technical solution adopted by the present invention to achieve the above object is: the rounded rolled nodular iron crankshaft includes the main journal and the connecting rod journal, the main journal and the connecting rod journal are installed between the crank arms, the main journ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C3/06B23P15/00B23P9/02
Inventor 宫传刚
Owner DEUTZ DALIAN ENGINE
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