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Machining method of thrust face of quenched crankshaft of forging steel fillet

A processing method and thrust surface technology, applied in the field of metal processing, can solve the problems of burns, large thermal deformation, large contact width between the thrust surface and the grinding wheel, etc., and achieve the effect of reducing the processing amount

Active Publication Date: 2011-07-20
DONGFENG AUTOMOBILE COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the large amount of thermal deformation of the forged steel crankshaft during fillet quenching, in order to ensure the quality of subsequent fine grinding, it is necessary to leave a machining allowance of 0.3-0.4mm on the end face; secondly, the contact width between the thrust surface and the grinding wheel is large, and the cooling effect Not good, it is easy to cause grinding cracks and burn quality defects

Method used

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  • Machining method of thrust face of quenched crankshaft of forging steel fillet
  • Machining method of thrust face of quenched crankshaft of forging steel fillet
  • Machining method of thrust face of quenched crankshaft of forging steel fillet

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Embodiment Construction

[0030] 1. Determination of the amount of end face grinding:

[0031] The temperature T of the surface layer of the workpiece a For: T a =C*V W 0.2 *a p 0.35 *f -0.3 *v s 0.25

[0032] In the formula: C refers to heat capacity

[0033] V W Refers to the feed speed of the grinding wheel

[0034] a p Refers to the grinding depth (face grinding allowance)

[0035] f refers to the feed rate

[0036] v s Refers to the workpiece rotation

[0037] It can be seen from the formula that the grinding depth a p to T a The greatest impact, followed by the wheel speed. Grinding depth a p (Face grinding allowance) increase, T a increases, the temperature under the surface of the workpiece gradually increases, so a p Can not choose too large.

[0038] According to the statistics, the end jump of the thrust face after the actual quenching is:

[0039] 1) The average value of the reference end is 0.16, and the maximum value is 0.30.

[004...

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Abstract

The invention provides a machining method of a thrust face of a quenched crankshaft of a forging steel fillet. The machining method comprises the following steps of: (1) rough turning; (2) finish turning; (3) thermal treatment; (4) finish turning, namely 1) measuring before the finish turning, and determining the machining amount of a finish turning process of a rear thrust face, namely measuring an axial size L' from a rear oil seal end face of the crankshaft to the rear thrust face by taking the rear oil seal end face of the crankshaft as the benchmark, and determining the finish turning mounting amount b of the rear thrust face; 2) performing finish turning on a machined part, namely the rear thrust face to ensure that the finish turning machining amount is b, and the left finish grinding machining amount a of the rear thrust face is 0.2+ / -0.05mm; 3) measuring the width between the rear thrust face after the finish turning and a front thrust face before the finish turning, and determining the finish turning machining amount of the front thrust face; and 4) performing finish turning on the front thrust face to ensure that the left finish grinding machining amount c is 0.2+ / -0.05mm, namely when the width between the front and rear thrust faces after finish grinding is H, and when the front and rear thrust faces after the finish turning of the step is H', H-H'=a+c; and (5) performing finish grinding to ensure that the width between the front and rear thrust faces is H.

Description

technical field [0001] The invention relates to a processing method for the thrust surface of a forged steel fillet quenched crankshaft, which belongs to the technical field of metal processing, in particular to the processing technology for the thrust surface of a forged steel fillet quenched crankshaft. Background technique [0002] The thrust surface of the forged steel crankshaft is the part most prone to grinding burns and grinding cracks in the grinding process of the crankshaft, especially the quenched and strengthened crankshaft is more prominent. [0003] Due to the large amount of thermal deformation of the forged steel crankshaft during fillet quenching, in order to ensure the quality of subsequent fine grinding, it is necessary to leave a machining allowance of 0.3-0.4mm on the end face; secondly, the contact width between the thrust surface and the grinding wheel is large, and the cooling effect Not good, it is easy to produce quality defects that cause grinding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
Inventor 徐春友
Owner DONGFENG AUTOMOBILE COMPANY
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