Cold precision forging technique for Z type contacts

A cold precision forging and contact finger technology is applied to the overall precision cold forging forming process of Z-shaped contact fingers, which can solve the problems of difficulty in ensuring the design shape and use requirements of the Z-shaped contact fingers, save raw materials, improve processing efficiency, Good surface roughness

Active Publication Date: 2012-01-18
QINHAN PRECISION IND CO LTD
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AI Technical Summary

Problems solved by technology

Since the material of the Z-type finger is pure copper, the springback of the copper during bending will cause a large change in angle, and the additional deformation during bending will deform the nearby holes and adjacent parts, making it difficult to ensure the design shape of the Z-type finger and Requirements

Method used

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  • Cold precision forging technique for Z type contacts
  • Cold precision forging technique for Z type contacts
  • Cold precision forging technique for Z type contacts

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Embodiment Construction

[0025] combine figure 1 — Figure 4 , using a 7mm×10.5mm T2Y copper bar directly into the die for blanking and preforming, that is, blanking and preforming are completed in a pair of molds at the same time. The preform is heated at a temperature of 600°-700°C, held for 1.5-3 hours, and then air-cooled or water-cooled; after the above-mentioned annealing and softening treatment, the annealing hardness of the preform is controlled to be HB40-45. The annealed and softened preform is polished in a finishing machine to remove defects such as burrs and oxide scales, and then cleaned, cleaned and air-dried, and then coated with zinc stearate powder lubricant. The preformed part after the above treatment is formed by cold precision forging. During the final forming process of cold precision forging, one hole is extruded, and the other hole is only pressed into a tapered hole, leaving a small amount of margin on the edge of the hole. The reason for the allowance is that the angle bet...

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Abstract

The invention discloses a cold precision forging technique for Z type contacts, which relates to the technical field of cold precision forging and solves the problem that the conventional machining technique of post-forging bending can hardly guarantee the designed shapes and application requirements of Z type contacts. The technique includes the steps that: a copper bar directly enters a die, and is blanked and preformed; the preformed blank is annealed to be softened; after the blank receives intermediate treatment, cold precision forging is carried out; another unformed flat-bottomed hole of the cold precision forged blank is reamed; and subsequent treatment is carried out. The technique can guarantee the consistency of the shapes of finished products, and can ensure that the metal fibers of the Z type contacts can be continuously distributed according to the shape of the Z type contacts.

Description

technical field [0001] The invention relates to the technical field of precision cold forging, in particular to an integral precision cold forging forming process of a Z-shaped contact finger used on a high-voltage switch and a lightning arrester thereof. Background technique [0002] Due to various reasons, the structure of the high-voltage switches used in my country's high-voltage power transmission and transformation industry varies greatly, and the performance varies greatly. Among them, the high-voltage switches imported from Japan's Toshiba have the most stable performance, and only the imported series of high-voltage switches are used in large quantities. Z-type tentacles, also translated as contacts. At present, the Z-type contact fingers used in China are basically imported from Japan, and they adopt the processing technology of bending and forming after forging. Since the material of the Z-type finger is pure copper, the springback of the copper during bending wi...

Claims

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Application Information

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IPC IPC(8): B21J5/02B21J3/00C21D1/26C21D9/00C21D11/00
Inventor 辛选荣刘新成史志欣
Owner QINHAN PRECISION IND CO LTD
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