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Crank shaft and process for manufacturing material therefor

A manufacturing method, crankshaft technology, applied in the field of crankshaft, can solve difficult problems such as casting mold or forging mold management, and achieve the effect of easy management, reduced workload, and reduced quantity

Active Publication Date: 2010-06-09
METAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the manufacturing error of molded products for crankshafts depends on the accuracy of casting molds or forging molds, there is a problem that it is difficult to manage the wear and tear of casting molds or forging molds accompanying use.

Method used

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  • Crank shaft and process for manufacturing material therefor
  • Crank shaft and process for manufacturing material therefor
  • Crank shaft and process for manufacturing material therefor

Examples

Experimental program
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Embodiment Construction

[0046] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Figure 6 It is a flowchart showing a series of steps related to the manufacture of a forged crankshaft.

[0047] Figure 6 Steps S111 to S119 shown are processes for producing crankshaft raw materials from steel materials, and the above crankshaft raw material manufacturing processes are carried out by a forging and molding factory. with the existing example Figure 8 As can be seen from the comparison, in the embodiment of the present invention, a pre-machining process S117 is added before the primary mass-balance measurement S118. (balance weight) part of the implementation of cutting. In the pre-machining step S117, the counterweight portion of the forged crankshaft molded product is a typical example of the cutting portion, and other portions (other than the pin portion and the journal portion, which have not been machined conventionally) may be used.

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PUM

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Abstract

It is intended to meet the strict product precision demand on crank shaft while easing the management of forming process. Preliminary machining step (S117) is added before primary mass balance measurement (S118) performed to form center holes on both end faces of shaped item for crank shaft. In the preliminary machining step (S117), cutting work is performed on a balance weight portion of the shaped item for crank shaft.

Description

technical field [0001] The present invention relates to a crankshaft as an output shaft of an engine, and more specifically relates to a method for manufacturing the crankshaft and its raw material. Background technique [0002] The crankshaft constituting the engine output shaft can be broadly classified into a cast crankshaft and a forged crankshaft depending on the forming method. Cast crankshafts are suitable for low-revving engines and engines that produce less torque. The metal structure of the forged crankshaft is dense. After being made into a forged product, although it is optional, the mechanical properties can be improved after heat treatment, and it is suitable for high-rotation engines and engines that generate high torque. [0003] The manufacture of crankshafts can be roughly divided into the forming process of producing molded products for crankshafts regardless of whether it is casting or forging; the machining process of producing crankshafts by machining ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C3/08F16C3/20B21K1/08
CPCF16C3/08G01M1/34F16F15/283B23P15/00B23P2700/07B21K1/08Y10T29/49286F16C3/20
Inventor 三浦哲夫
Owner METAL TECH CO LTD