Oil pressure type floating expanding positioning pin

Abstract

The invention discloses an oil pressure type floating expanding positioning pin. The oil pressure type floating expanding positioning pin comprises a cylinder block, a first installing hole is formedin the cylinder block, a floating pin, a screw plug, a floating spring and an end cover are arranged in the first installing hole from top to bottom, a second installing blind hole is formed inside the floating pin, a guide hole is formed in a pin head of the floating pin in the radial direction of the first installing hole, a steel ball is arranged in the guide hole in a rolling fit mode, an expanding pin and a reset spring are further arranged in the second installing blind hole, a reducing part is formed on the upper portion of the expanding pin, the expanding pin is sleeved with a first sealing ring, the screw plug is sleeved with a second sealing ring, and the first sealing ring, the expanding pin, the screw plug, the second sealing ring and the second installing blind hole are combined to form a closed oil pressure cavity. According to the floating expanding positioning pin, positioning of small-aperture products is achieved, the problem of product deformation during product clamping is effectively avoided, and the floating expanding positioning pin can be applied to machining of thin-wall products with higher requirements.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to an oil-hydraulic floating diameter-expanding positioning pin. Background technique [0002] Currently used locating pins, such as oil pressure expanding locating pins produced by Japanese companies, can only be applied in the range of Φ7.6-10.8mm due to structural and material factors. Especially if it is applied to an aperture smaller than Φ7.0mm, it will often be damaged due to insufficient strength, and even the production cannot be carried out smoothly. With the continuous innovation and upgrading of automobile products, for example, the design of the process holes for blank positioning of automobile products is getting smaller and smaller, and some process holes are between Φ5.5-7.0mm, so the current positioning pins can no longer adapt to the product. The positioning requirements cannot meet the production needs. [0003] Moreover, the existing l...

AI Technical Summary

Problems solved by technology

[0002] The positioning pins currently used, such as the hydraulic expansion positioning pins produced by Japanese companies, can only be used in the range of Φ7.6-10.8mm due to structural and material factors.

Especially if it is applied to an aperture smaller than Φ7.0mm, it will often be damaged due to insufficient strength, and even the production cannot be carried out smoothly

With the continuous innovation and upgrading of automobile products, for example, the design of the process holes for blank positioning of automobile products is getting smaller and smaller, and some process holes are between Φ5.5-7.0mm, so the current positioning pins can no longer adapt to the product. The positioning requirements cannot meet the production needs

[0003] Moreover, the existing locating pins also have a defect: the locating pins generally adopt an integral non-adjustable structure, and when some thin-walled products are produced, the thin-walled products will deform when they are clamped.

Since the positioning pin has no buffer gap during contact with the thin-walled product, the positioning pin will cause deformation of the thin-walled product

Although such a deformation value is very small, for some products with high flatness requirements, it is enough to cause waste products, which is very unfavorable for production

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