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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

Active Publication Date: 2007-03-21
DAIDO KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, when a load is applied to the chain, cracks are generated from the groove (h), and the chain plate (a) is fatigue-broken.
In addition, as shown in FIG. 6C, the ball penetration hole (f) is often in the shape of a drum with a very slightly bulged center, and sufficient strength cannot be obtained.

Method used

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  • Chain and method for blanking hole in chain plate
  • Chain and method for blanking hole in chain plate
  • Chain and method for blanking hole in chain plate

Examples

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Embodiment

[0032] FIG. 1 shows the processing steps of the plate according to the present invention. First, (a) the plate 1 is punched and punched. Pre-drilled holes 2 are formed at both ends of the substantially elliptical link plate 1 . The pin is inserted into this pre-drilled hole 2 in the case of the outer plate 1 and into the bushing in the case of the inner plate. Then, (b) heat-treat the punched and punched plate to provide strength for functioning as a chain member. During heat treatment, the quenching temperature and tempering temperature are slightly different depending on the material of the plate and the application of the chain.

[0033] (c) Next, gear shaving is performed on the pre-drilled hole 2 of the heat-treated plate 1 . Here, the shaving punch 3 is inserted into the pre-drilled hole 2 , and the trumpet-shaped pre-drilled hole 2 after punching and punching is processed for shaving. Straight hole 4 is obtained by shaving. (d) Next, chamfering is performed on the e...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16G13/00B24B29/02
CPCF16G13/06
Inventor 尾野琢磨村井重夫
Owner DAIDO KOGYO CO LTD
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