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Crankshaft

A crankshaft, quality technology, applied in the crankshaft field, can solve problems such as use restrictions

Inactive Publication Date: 2005-09-21
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, the concern for environmental protection has been increasing globally, and lead has gradually been kept at a respectful distance, and its use is being restricted.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0056] The results of experiments conducted to confirm the effects of the present invention will be described below.

[0057] First, raw materials were blended so as to obtain the compositions shown in Table 1, and 5 tons of steel ingots were melted in an electric furnace. This steel ingot was made into a rolled steel bar with a diameter of 88 mm by hot rolling, heated at 1250° C., hot forged into the shape of a crankshaft, and then cooled by air cooling. The cooled component was subjected to drilling processing with a deep hole drill, and the number of processed holes until cutting was impossible due to abnormal noise or tool breakage was evaluated as an index of machinability. In addition, for cutting, a cemented carbide deep hole drill with a diameter of 6 mm was used, and the cutting conditions were as follows:

[0058] Cutting speed: 150m / min

[0059] Feed: 0.04mm / rotation

[0060] Hole depth: 60mm

[0061]

[0062] After hot forging the steels of the above ...

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Abstract

A crankshaft is made of steel wherein straightening can be carried out with ease even though normalizing after hot forging is eliminated, and wherein cutting work can be carried out with ease even though lead (Pb) content of the steel is low. The steel is to be treated with ferritic nitrocarburizing after being machined to a crankshaft, and contains following chemical compositions: C: not less than 0.35 mass % (mass percentage) and not more than 0.45 mass %, Si: not less than 0.1 mass % and not more than 0.4 mass %, Mn: not less than 0.4 mass % and not more than 0.7 mass %, S: not less than 0.04 mass % and not more than 0.07 mass %, Ca: not less than 0.0005 mass % and not more than 0.0050 mass %, Ti: not less than 0.0050 mass % and not more than 0.0120 mass %, N: not less than 0.0042 mass % and not more than 0.0480 mass %, and balanced Fe and inevitable impurities, wherein Ti / N (the ratio of mass percentages of Ti and N) is controlled in the range of not less than 0.25 to not more than 1.2, and Pb is regulated to not more than 0.03 mass %. In addition, the cross-sectional microstructure except the ferritic nitrocarburized layer consists of ferrite+pearlite. In this ferrite+pearlite microstructure, the total number of sulfides, the size of which exceed 1 mum (micro-meters) observed per 160 mm2 of the viewing field, is counted to be not less than 12,000 and not more than 31,000, and the averaged grain size of pearlite lies in the range of not less than 14 mum to not more than 20 mum.

Description

technical field [0001] The present invention relates to a crankshaft, and more particularly, to a crankshaft made of non-lead-based non-quenched and tempered nitrocarburized steel exhibiting excellent bending correction properties. Background technique [0002] [Patent Document 1] JP-A-10-030632 [0003] [Patent Document 2] Japanese Unexamined Patent Publication No. 06-128690 [0004] [Patent Document 3] Japanese Unexamined Patent Publication No. 05-279795 [0005] [Patent Document 4] Japanese Unexamined Patent Publication No. 05-279794 [0006] Crankshafts for automobiles are required to be superior in static strength and fatigue strength because they are used in an environment where large torsional loads and bending loads are repeatedly applied. On the other hand, since it is an extra-large and complex-shaped part, it is basically usually manufactured from non-quenched and tempered steel that is not subjected to quenching and tempering after hot forging. In this case, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C3/06C21D6/00C21D7/13C21D9/30C22C38/00C22C38/14C22C38/60C23C8/32
CPCC23C8/32
Inventor 天野政树次井庆介
Owner HONDA MOTOR CO LTD