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Forged crankshaft manufacturing device and manufacturing method

A technology of manufacturing device and manufacturing method, which is applied in the field of devices for hot forging to manufacture crankshafts, and can solve the problem that forged parts cannot be pulled out from a die.

Active Publication Date: 2018-01-19
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the formed forging may not be pulled out from the die

Method used

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  • Forged crankshaft manufacturing device and manufacturing method
  • Forged crankshaft manufacturing device and manufacturing method
  • Forged crankshaft manufacturing device and manufacturing method

Examples

Experimental program
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Embodiment Construction

[0078] The manufacturing apparatus of a forged crankshaft according to the present embodiment processes a forging from which burrs have been removed during the manufacturing process of a forged crankshaft. The forged crankshaft has a plurality of journals serving as the center of rotation, a plurality of pins eccentric to the journals, and a plurality of crankarms connecting the journals and the pins. The forging has a plurality of thick journal portions, a plurality of rough pin portions, and a plurality of thick crank arm portions respectively corresponding to the plurality of journal portions, the plurality of pin portions, and the plurality of crank arm portions of the forged crankshaft. At least some of the thick crank arm portions of the forging have a stub protruding from an outer periphery of a side portion of the thick crank arm portion. The manufacturing device includes a holding device, a moving device, and a pair of a first mold and a second mold. The first mold a...

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PUM

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Abstract

This forged crankshaft manufacturing device processes forgings from which flash has been removed. At least a portion of a plurality of rough crank arm portions in a forging have excess material portions which protrude out from the outer periphery of the side portions of the rough crank arm portions. The manufacturing device is provided with a first die (20) and a second die (30) which form a pair,a holding device (50) and a moving device (60). The first die (20) and the second die (30) subject the excess material portions to either a bending process or a crushing process. The holding device (50) holds at least some of a plurality of rough journal portions of the forging or at least some of a plurality of rough pin portions of the forging, in such a way that the direction of eccentricity of the rough pin portions is perpendicular to the direction of pressing by the first die (20) and the second die (30). The moving device (60) supports the holding device (50) in such a way that the holding device (50) can move in the direction of pressing.

Description

technical field [0001] The invention relates to a device and method for manufacturing a crankshaft by hot forging. Background technique [0002] In reciprocating engines such as automobiles, motorcycles, agricultural machinery, ships, etc., a crankshaft is indispensable for outputting power by converting the reciprocating motion of the piston into rotational motion. Crankshafts can be manufactured by die forging or casting. When the crankshaft is required to have high strength and high rigidity, a forged crankshaft made by forging is often used. [0003] Usually, in the manufacture of forged crankshafts, steel billets are used as raw materials. The billet has a circular or square cross-section, and the cross-sectional area is constant throughout the length. The manufacturing process of the forged crankshaft includes a pre-forming process, a die forging process, and a die forging trimming process. In addition, when it is necessary to correct the size and shape of the fina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/08B21J5/02F16C3/08
CPCB21J5/02F16C3/08B21K1/08B21J13/02B21J13/025B21J5/025
Inventor 山下智久薮野训宏吉野健高本奖黑川宣幸田村宪司大久保润一中山洁堀内徹
Owner NIPPON STEEL CORP
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