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Forging method for 1Mn18Cr18N nonmagnetic retaining ring of turbo-generator

A 1mn18cr18n, steam turbine generator technology, applied in the field of non-magnetic retaining ring forging of steam turbine generator 1Mn18Cr18N, can solve the problems of easy cracking of billets, affecting the quality of finished products, residual cracks in the forging process, etc., to achieve good grain size, The effect of improving quality

Pending Publication Date: 2021-12-17
四川丰元机械制造有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, cracks are easily generated in the center of the billet during the overall upsetting process, and the cracks will further expand and extend during repeated upsetting and subsequent forging processes, resulting in residual cracks on the forged product and even making the forging process unable to continue, affecting the final product the quality of

Method used

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  • Forging method for 1Mn18Cr18N nonmagnetic retaining ring of turbo-generator
  • Forging method for 1Mn18Cr18N nonmagnetic retaining ring of turbo-generator
  • Forging method for 1Mn18Cr18N nonmagnetic retaining ring of turbo-generator

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Embodiment

[0041] This embodiment provides a method for forging a turbogenerator 1Mn18Cr18N non-magnetic retaining ring, including the following steps:

[0042] S1. Before forging, the billet is heated in three stages, the maximum heating temperature is 1180°C, and the holding time is 9-12h; the specific parameters of the three stage heating can refer to the specific parameters in the prior art mentioned in the above background technology parameters, so I won’t go into details here.

[0043] It should be noted that before heating the billet, the surface of the billet should be polished and scabs removed. In order to facilitate understanding of the forging method of this embodiment, this embodiment is described by forging an original billet with a diameter of φ600 mm and a height of 1320 mm.

[0044] S2. Forging, divided into six fires, including:

[0045] The first firing: Upsetting and punching the billet after heating and heat preservation in step S1, and returning the upsetting and ...

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Abstract

The invention relates to the technical field of retaining ring forging, and provides a forging method for a 1Mn18Cr18N nonmagnetic retaining ring of a turbo-generator. The forging method for the 1Mn18Cr18N nonmagnetic retaining ring of the turbo-generator comprises the steps of blank heating and heat preservation before forging, upsetting punching, pre-broaching, primary mandrel drawing-out, rotary upsetting, secondary mandrel drawing-out and broaching forming. According to the forging method for the 1Mn18Cr18N nonmagnetic retaining ring of the turbo-generator, a blank becomes a hollow annular piece after upsetting punching and pre-reaming; at the moment, no tensile stress concentration point exists in the middle of the blank; and therefore, the risk that the blank generates forging cracks in the subsequent stages of primary mandrel drawing-out, rotary upsetting, secondary mandrel drawing-out and broaching forming is effectively reduced, and the quality of a forged finished product is improved; and meanwhile, the forging temperature of the blank is controlled in a stepped cooling mode after the second heating number, so that plastic guarantee can be provided for forging deformation of the blank, and the situation that the final quality of a finished product is affected due to secondary heating coarse grains caused by too high temperature can be avoided.

Description

technical field [0001] The invention relates to the technical field of forging retaining rings, in particular to a forging method for a 1Mn18Cr18N non-magnetic retaining ring of a steam turbine generator. Background technique [0002] 1Mn18Cr18N non-magnetic retaining ring is a component mainly used in turbogenerators. It belongs to austenitic steel and is characterized by high alloy content, narrow forgeable temperature range (about 900-1180°C), and high deformation resistance. The general forging method is very easy to crack, and the method of hot forging + solid solution + cold expansion + quenching is required to meet the performance and use requirements, which has high requirements for the tonnage of the press equipment. [0003] The existing hot forging methods are as follows: [0004] One is the forging method recorded in the article "Trial Production of 1Mn18Cr18N Steel Non-magnetic Retaining Ring Forging", which adopts three forging methods of upsetting + upsetting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21J5/06B21J5/08B21J5/10B21J1/06
CPCB21J5/002B21J5/06B21J5/08B21J5/10B21J1/06
Inventor 余佑祥吕汝兵冯东林崔建强
Owner 四川丰元机械制造有限公司
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