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Thermal bulging method of stainless-steel irregular ring rolled piece

A special-shaped ring, stainless steel technology, applied in metal processing equipment, forming tools, manufacturing tools and other directions, can solve the problems of low dimensional accuracy of special-shaped ring rolling parts, and achieve the effect of improving dimensional accuracy

Active Publication Date: 2012-06-27
GUIZHOU ANDA AVIATION FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method does not disclose in detail how to improve the dimensional accuracy of the ring through bulging, but it is generally concluded that the purpose of improving the forming accuracy of the retaining ring can be achieved, that is, this method cannot solve the dimensional accuracy of the special-shaped ring rolling existing in the prior art low problem

Method used

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  • Thermal bulging method of stainless-steel irregular ring rolled piece
  • Thermal bulging method of stainless-steel irregular ring rolled piece
  • Thermal bulging method of stainless-steel irregular ring rolled piece

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[0042] The main chemical element content (percentage by weight) of the stainless steel is: C content ≤ 0.1%, Si content ≤ 0.8%, Mn content 17.5% ~ 20.0%, P content ≤ 0.050%, S content ≤ 0.015%, The Cr content is 17.5%-20.0%, the N content is ≥0.50%, the Al content is ≤0.025%, the B content is ≤0.001%, and the balance is Fe.

[0043] The structural diagram of the bulging machine for implementing the thermal bulging method of the present invention is as follows: figure 2 As shown, the bulging machine is mainly composed of a mandrel slider 1, a radial slider 2, a bulging block 3, a workbench 4 and a guide rail 5. The mandrel slider 1 is conical and is set in the radial slider 2 to cooperate with the conical inner peripheral surface of the radial slider 2. The mandrel slider 1 can be driven by the hydraulic cylinder of the bulging machine on the radial slider 2. Move up and down in the axial direction and squeeze the radial slider 2; the radial slider 2 is installed on the guide r...

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Abstract

The invention discloses a thermal bulging method of a stainless-steel irregular ring rolled piece, and the method comprises the following steps of: sleeving the hot-rolled stainless-steel irregular ring rolled piece on the periphery of a pre-heated bulging block in a bulging machine; starting the bulging machine so that the ring rolled piece is squeezed from the inner circumference surface of the ring rolled piece in a radial direction, thus completing primary bulging, wherein the bulging temperature is 910-970 DEG C, the bulging time is 18-30 seconds, the pressure holding time is 8-9 seconds and the deformation amount is 0.9-1.1%; rotating the ring rolled piece around a center axis for 45 degrees, thus completing primary rotation; carrying out secondary bulging according to the previous steps, wherein the bulging temperature is 870-930 DEG C, the bulging time is 18-30 seconds, the pressure holding time is 12-14 seconds and the deformation amount is 0.8-1%; rotating the ring rolled piece according to a primary rotating direction again, thus completely secondary rotation; and carrying out tertiary bulging according to the previous steps, wherein the bulging temperature is 820-890 DEG C, the bulging time is 28-40 seconds, the pressure holding time is 18-20 seconds and the deformation amount is 0.6-0.9%. The size precision of the bulged ring rolled piece can reach 0.1-0.2% of the corresponding size. The bulged ring rolled piece formed by using the method disclosed by the invention is mainly used for fields of aerospace and the like.

Description

technical field [0001] The invention relates to a bulging method for a ring, in particular to a thermal bulging method for a stainless steel special-shaped ring rolling piece. Background technique [0002] Stainless steel special-shaped ring-rolled pieces (referring to the ring-rolled pieces whose longitudinal section is non-rectangular section) are rolled by ring rolling mills. Due to the influence of rolling process and equipment limitations, their dimensional accuracy is generally not high; only in the shape of special-shaped ring-rolled pieces In the case of ideal and excellent equipment performance, the dimensional accuracy can reach 3‰~5‰ (three thousandths to five thousandths) of the corresponding size, and the special-shaped ring after rolling has a large stress. If the control is not good in the subsequent processing steps, defects such as warping, deformation and even cracking may easily occur. [0003] The Chinese invention patent specification CN 101367104A publ...

Claims

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Application Information

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IPC IPC(8): B21D39/20B21D37/16
Inventor 苏春民赵飞石磊周丹伟邹善垚刘成宋永喜
Owner GUIZHOU ANDA AVIATION FORGING
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