Chain and method for blanking hole in chain plate

A processing method and chain technology, which is applied in the field of chains, can solve problems such as cracks, fatigue fracture of chain plates, and inability to obtain strength, and achieve the effects of improving fatigue strength, increasing fatigue strength, improving dimensional accuracy and surface roughness
CN1932332AActive Publication Date: 2007-03-21DAIDO KOGYO CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
DAIDO KOGYO CO LTD
Publication Date
2007-03-21

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Abstract

In blanking holes in plates that comprise a chain, in order to improve the fatigue strength of the chain, a press-punched plate prepared hole, trumpet-shaped, is shaved and made into a straight hole, both ends of the straight hole are chamfered, and further, a multi-step burnishing punch composed of a plurality of annular convex portions at predetermined intervals is pressed into the straight hole, improving the dimensional accuracy of the hole and the smoothness of the hole wall and producing compressive residual stress in the hole wall.
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Description

technical field

[0001] The present invention relates to a hole processing method of a link plate and a chain using the link plate manufactured by the hole processing method. Background technique

[0002] In order to improve the strength, especially the fatigue strength, of a conveyor chain or a roller chain for power transmission, it is necessary to improve the dimensional accuracy and surface roughness of pin holes and bushing holes of the plates. Because the plate of the chain is generally punched and punched, the sheared surface of the hole is only a part, and most of it is the fractured surface. Cracks are generated from the fractured surface, and the plate is broken. As a result, machining a hole without the fractured surface is an essential condition for improving the fatigue strength of the plate and the chain.

[0003] Conventionally, press-shear processing that does not generate fractured surfaces has been known. For example, fine blanking processing (precision pe...

Claims

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