Forging process of engine crankshaft

An engine and process technology, applied in the direction of engine components, mechanical equipment, etc., can solve the problems of weakening the strength of the crankshaft, discontinuity of the essential grain fibers, etc., and achieve the effect of less investment in tooling and auxiliary tools, long service life, and good forging quality.

Inactive Publication Date: 2014-04-02
JIANGSU JINYUAN FORGE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There is a big defect in the crankshaft currently used and produced by die forging, that is, the essential grain fibers at the fillet of the crankshaft are discontinuous, thus weakening the strength of the crankshaft, and the fillet is the place that bears the greatest mechanical stress place

Method used

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  • Forging process of engine crankshaft

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Embodiment Construction

[0016] A forging process for an engine crankshaft, comprising the following steps:

[0017] 1), the first fire: Press the pliers to take the bar stock %430×500, gnaw the bottom, upsetting to a height of 900, pull out #750, and the length is about 1715;

[0018] 2) Upsetting to a height of 850, drawing to a hexagonal height of 650, a length of about 2140, and a stamping depth of 120;

[0019] 3), the third fire: use 120 degrees up and down V-shaped anvil to make a wrong turn, the wrong shift amount is 170, trim and straighten;

[0020] 4) Press the crutch (2) first, then use a square ruler to determine the angle, then press the crutch (3) to 550×460, and then press the crutch (1) to 550×460;

[0021] 5), number stamp, press out the small shaft (5) at the bottom end, and press out the small shaft (4) between the flange and the turning (1);

[0022] 6) Round the flange to the process size. After the size is in place, check the relative angle of each turn with a square, and use ...

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Abstract

The invention discloses a forging process of an engine crankshaft. The forging process includes the following steps: 1), for first fire, holding a bar by a pressing clamp, biting the bottom, upsetting and drawing; 2), for second fire, upsetting, drawing and performing number printing, wherein number printing depth is 120; 3), for third fire, using a 120-degree up-down V-shaped anvil to perform turn grinding, finishing and straightening, wherein grinding shift amount is 170; 4), pressing a turn (2), using an angle square to determine an angle, pressing a turn (3), and pressing a turn (1); 5), performing number printing, pressing out a bottom end small shaft (5), and pressing out a small shaft (4) between a flange and the turn (1); 6), rounding the flange to be in a process size, using the angle square to check relative angle of all turns after reaching the required size, using a wrench to adjust the relative angle of the turns by taking a middle turn as a reference, chamfering sides of each turn, finishing, straightening and completing. Metal fibers of a forged crankshaft are continuous and free of distortion, the forged crankshaft is high in quality, long in service life, few in tool aid input, high in additional value and obvious in economic benefit, and the forging process is applicable to forging production of various crankshafts.

Description

technical field [0001] The invention relates to a forging process of an engine crankshaft. Background technique [0002] The crankshaft is an important part of the engine. It is subjected to large and complicated forces during operation. At the same time, the crankshaft is a high-speed rotating part, so the crankshaft is required to have sufficient strength and rigidity. [0003] There is a big defect in the crankshaft currently used and produced by die forging, that is, the essential grain fibers at the fillet of the crankshaft are discontinuous, thus weakening the strength of the crankshaft, and the fillet is the place that bears the greatest mechanical stress place. Contents of the invention [0004] The object of the present invention is to provide a forging process of an engine crankshaft. The forged crankshaft has continuous essential grain fibers without distortion, good forging quality, good ability to bear impact load, and prolonged service life. [0005] Techni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/08
Inventor 赵寅史绿萌
Owner JIANGSU JINYUAN FORGE
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