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Method and apparatus for forming special-shaped wire material

A forming device and forming method technology, applied in metal rolling and other directions, can solve the problem that the number of forming times cannot be reduced, and achieve the effect of reducing the number of forming times and increasing the filling rate

Inactive Publication Date: 2004-06-30
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Like this, because the power that is applied on the wire rod increases, and the wire rod is extended, as shown in Figure 3, the material of the special-shaped cross-section with circular arch (web) 8 and edge (flange) 9 is formed. In this case, the wire only extends in the length direction, and the edge 9 cannot be fully filled in the roll pass.
Therefore, when the special-shaped wire is formed by the traditional Turk head roll, in order to increase the filling rate, the reduction of area must be reduced to reduce the tension on the wire, so the number of times of forming cannot be reduced.

Method used

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  • Method and apparatus for forming special-shaped wire material
  • Method and apparatus for forming special-shaped wire material
  • Method and apparatus for forming special-shaped wire material

Examples

Experimental program
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Effect test

Embodiment

[0065] Using the molding device for the shaped wire with the above structure, mass production molding of shaped piston rings with cross-sectional shapes as shown in Fig. 8 was carried out from 0.65C-13Cr steel. During molding, the tension of the molded material between the front Turkic head 16 and the rear Turkic head 17 is controlled to be about 200N, and the tension between the molding unit 15 and the final processing Turkic head 21 is about 100N.

[0066] As a result, there was no annealing between the two moldings, and a high-precision finished product with a dimensional accuracy of 10 μm in the edge dimension H and the width W was obtained.

[0067] In the case of using a conventional device to manufacture the special-shaped piston ring in the shape of this embodiment, three non-driven Turk heads arranged in front and rear (tandem) are required for drawing forming. Moreover, drawing must be divided into three times, and intermediate annealing must be carried out twice in ...

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Abstract

The present invention provides a forming method of shaped wire material and its equipment. Said equipment has a forming unit formed from combination of non-driven front part 4 square roll turks heads and power-driven rear part 4 square roll turks heads, and the rear portion of the forming unit is equipped with successively and straight-line arranged non-driven 4 square roll turks heads with finishing roll line. The forming roll of power-driven turks head has the diameter which is above 70 times greater than height of edge of formed material, and the tension beared by formed material between the above-mentioned non-driven turks heads and power-driven turks head can be controlled below 300N. Said invention can high-effectively and high-accurately produce shaped wire material.

Description

technical field [0001] The invention relates to a special-shaped wire suitable for an engine piston ring, in particular to a forming method and device for an approximately H-shaped special-shaped wire used for an oil ring. Background technique [0002] With the development of high-speed and high-output engines, high-load piston rings are also changed from cast iron to steel, and then special steel such as high-alloy stainless steel is used. Especially in the example shown in FIG. 7 , an oil ring with complex special-shaped cross-section such as an approximate H-shaped cross-section is used, and has strict requirements on dimensional accuracy. [0003] Now, the molding of such piston rings with special-shaped cross-sections is mostly after the round wire is formed into a rectangular wire, by the non-driven 4-side roller Turk head ( Turks Head) 4 is configured in a front-to-back straight row, and is formed by drawing. Moreover, the set shape is reached after 3 to 5 repeated ...

Claims

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Application Information

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IPC IPC(8): B21B1/16
Inventor 三神隆男舛形芳树唐桶隆男
Owner HITACHI METALS LTD
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