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A kind of electromagnetic pure iron straight strip material cold rolling process method

A technology of electromagnetic pure iron and process method, which is applied in the direction of inductance/transformer/magnet manufacturing, circuits, electrical components, etc., can solve the problems of increasing railway signal relays, high material loss, rough surface, etc., and achieve the improvement of material surface quality and utilization Efficiency improvement and elimination of internal stress

Active Publication Date: 2020-11-03
XIAN RAILWAY SIGNAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no profiles that can be used directly on the market for processing parts. The industry uses electromagnetic pure iron round bars to be hot-rolled into flat strips or hot-rolled electromagnetic pure iron sheets to be cut into flat strips by shearing machines. , and then processed by cold drawing process (annealing, pickling, rolling head, cold drawing and other multi-pass processes) into electromagnetic pure iron straight strips
[0003] In the process of processing electromagnetic pure iron bar or electromagnetic pure iron sheet, the material loss in removing the surface defects of the bar or cutting the edge of the sheet, as well as the process of cold drawing and rolling head is relatively high; The rear surface of the profile is relatively rough, and the oil stain is relatively serious, which is difficult to clean off. Professional cleaning must be carried out before the next process, so the waste rate is also high; in addition, the cost of waste liquid produced by the pickling process is increasing year by year Increment and other issues have been bothering us
[0004] With the rapid development of railways and urban rails, the demand for railway signal relays has increased significantly, and the reliability and stability of products have higher requirements. The existing technology methods cannot meet the demand, and it is imperative to improve the technology.

Method used

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  • A kind of electromagnetic pure iron straight strip material cold rolling process method

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Embodiment 1

[0028] Such as figure 1 Shown, provide a kind of electromagnetic pure iron straight bar material cold-rolling process, it comprises: pickling tank 1, four continuous rolling mill production line 2, vacuum annealing furnace 3, straightening and cutting production line 4; It is characterized in that: its technological process is at least The method includes the following steps: preparing materials, and processing hot-rolled electromagnetic pure iron disc round material; the diameter of the hot-rolled electromagnetic pure iron disc round material is 26 mm.

[0029] In the pickling pool 1, the hot-rolled electromagnetic pure iron straight strips are pickled to remove oil and rust; for the first time on the four-tandem rolling mill production line 2, they are rolled into flat iron discs and round materials (for armatures) in four processes. For the first time, the size of rolling and forming on the production line 2 of the four-tandem rolling mill is 7 mm×32 mm; the first vacuum an...

Embodiment 2

[0035] Such as figure 1 Shown: provide a kind of electromagnetic pure iron straight strip material cold rolling process, comprising: pickling pool 1, four continuous rolling mill production line 2, vacuum annealing furnace 3, straightening and cutting production line 4, it is characterized in that: its technological process at least includes The steps are as follows: preparing materials and processing hot-rolled electromagnetic pure iron disc round material; the diameter of the hot-rolled electromagnetic pure iron disc round material is 26mm.

[0036] In the pickling pool 1, the hot-rolled electromagnetic pure iron straight strips are pickled to remove oil and rust; for the first time on the four-tandem rolling mill production line 2, they are rolled into flat iron discs and round materials (for yokes) in four processes. For iron); the size of rolling and forming on the four-tandem rolling mill production line 2 for the first time is 8 mm×32 mm; the first vacuum annealing trea...

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Abstract

The invention relates to a cold rolling method for a raw material of a railway signal relay key component (armature iron, yoke iron), in particular to a method for cold rolling process of an electromagnetic pure iron straight strip material. The method for cold rolling process of the electromagnetic pure iron straight strip material is characterized by comprising the steps that a hot-rolled electromagnetic pure iron plate round material is divided into multiple passes to be pressed and multiple annealing treatments to eliminate the internal stress generated during the cold rolling process according to the cold rolling process, and to achieve the purpose of refining the grain structure and improve the properties of the molding material. Annealing treatment is carried out under vacuum, and the surface of the material does not scale the product during the whole process, completely eliminating the loss caused by the scale. The electromagnetic pure iron straight strip cold rolling method has good processability and high reliability, and not only solves the problems of high material loss, poor surface quality, and pollution caused by pickling in the cold drawing process of the prior artmethod, but also ensures that the relay is effectively and reliably connected to ensure safe travel of the rail train.

Description

technical field [0001] The invention relates to a processing method for raw materials of key parts (armature and yoke) of railway signal relays, in particular to a cold rolling process for electromagnetic pure iron straight strips. Background technique [0002] At present, various types of railway signal relays are widely used in railway signal control systems. The raw materials of two key parts (armature and yoke) of this product are electromagnetic pure iron materials. The product design requires the magnetic performance level of the material to be DT4A. Coercive force ≤ 96 (A / m), belonging to the ordinary level. With the continuous improvement of domestic electromagnetic pure iron smelting technology, the magnetic performance level of electromagnetic pure iron materials widely used in the market has reached DT4C, and the coercive force is ≤32 (A / m), which is a super level. The company also gives priority to processing parts with materials with high magnetic properties, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12C21D1/773C21D1/26H01F41/02
CPCC21D1/26C21D1/773C21D8/1233C21D8/1266H01F41/02
Inventor 徐建立赵莉李学强
Owner XIAN RAILWAY SIGNAL