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Molten-chromium and molten-carbon reinforcing repair method for non-even wear guide rail surface

A repair method and non-uniform technology, which is applied in the field of non-uniformly worn guide rail surface melting chromium and molten carbon strengthening repair, which can solve the problems of guide rail accuracy not meeting the use requirements, time-consuming and labor-intensive, poor wear resistance, etc., to achieve non-uniform repair Range, excellent performance, stable and uniform effect on wear resistance

Inactive Publication Date: 2018-06-22
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, for cast iron guide rails, the quenching process is used to increase their hardness and wear resistance before use. When the guide rails are scrapped, there is often a 1-5mm thick remaining quenched layer on the surface. After testing, it is found that the surface structure, hardness and The anti-wear performance changes gradually along the thickness direction of the quenched layer. The greater the thickness from the surface to the bottom, the lower the hardness and the worse the anti-wear performance
The traditional repair method is to repair on the uniform surface, so it is necessary to remove the remaining quenched layer on the surface of the guide rail, which is not only time-consuming and laborious, but also makes the accuracy of the guide rail in the height direction unable to meet the use requirements; A new method that can directly repair the non-uniform wear failure surface to obtain stable and uniform anti-wear performance

Method used

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  • Molten-chromium and molten-carbon reinforcing repair method for non-even wear guide rail surface
  • Molten-chromium and molten-carbon reinforcing repair method for non-even wear guide rail surface
  • Molten-chromium and molten-carbon reinforcing repair method for non-even wear guide rail surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The surface hardness value of the guide rail is 300-420HV, and the hardness difference △H is 120HV. Since n=[△H / 100+0.5]=1, there is only one wear zone on the surface of the guide rail, which is set as zone A, and the standard hardness is Value H 0A =360HV. According to the relationship between the bionic surface and the hardness value of the wear zone, it can be known that the bionic surface S processed in the wear zone 2 . If M%=30% after repair is set, then by (h 0 -h w ') / h 0 = M% we can know h w '=(1-M%)×h 0 =0.5404μm, because 20%0A and h w = h w ' value is substituted into the biomimetic surface S composed of strip-shaped units 2 The wear resistance relation: h w =-0.00086×H+0.0026×θ+0.018×L+0.5705; get θ 0A =107.5-6.9×L 0A , so set the standard spacing L 0A After the value of θ can be obtained 0A , L 0A = 4 ~ 6mm, θ 0A =45°~90°. Divide zone A into 4 small hardness intervals, the hardness range of interval 1 is 300-330HV, and the average hardness ...

Embodiment 2

[0057] The surface hardness value of the guide rail is 300-580HV, and the hardness difference △H is 280HV. Since n=[△H / 100+0.5]=3, the surface of the guide rail is divided into three wear areas A, B, and C. A Zone hardness range 300 ~ 400HV, standard hardness value H 0A =350HV; the hardness range of B zone is 400~500HV, and the standard hardness value is H 0B =450HV; the hardness range of C zone is 500~580HV, and the standard hardness value is H 0C =540HV. According to the relationship between the bionic surface and the hardness value of the wear interval, it can be known that the bionic surface S processed in area A 2 , B area processing bionic surface S 3 , area C processing bionic surface S 4 . Set repaired M% = 50%, then by (h 0 -h w ') / h 0 = M% we can know h w '=(1-M%)×h 0 =0.386μm, because 40%0A and h w = h w ' value is substituted into the bionic surface S composed of mesh units 2 The wear resistance relation h w =-0.00061×H+0.0018×θ+0.013×L+0.4084, it can...

Embodiment 3

[0059] The surface hardness value of the guide rail is 200-700HV, and the hardness difference △H is 500HV. Since n=[△H / 100+0.5]=5, the surface of the guide rail is divided into five parts: A, B, C, D, and E Wear zone, the hardness range of A zone is 200~300HV, and the standard hardness value is H 0A =250HV; the hardness range of B area is 300~400HV, and the standard hardness value is H 0B =350HV; the hardness range of C zone is 400~500HV, and the standard hardness value is H 0C =450HV; the hardness range of D zone is 500~600HV, and the standard hardness value is H 0D =550HV; the hardness range of E zone is 600~700HV, and the standard hardness value is H 0E =650HV. According to the relationship between the bionic surface and the hardness value of the wear interval, it can be known that the bionic surface S processed in area A 1 , B area processing bionic surface S 2 , area C processing bionic surface S 3 , area D processing bionic surface S 4 , E zone processing bionic s...

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Abstract

The invention relates to a molten-chromium and molten-carbon reinforcing repair method for a non-even wear guide rail surface. According to the method, the guide rail surface is divided into a plurality of wear zones according to the hardness value of the guide rail surface, and various biomimetic surfaces with different wear resistant properties, which are formed by the uniform arrangement of molten-carbon units b and molten-chromium units a or the combination arrangement of different numbers of molten-carbon units b and molten-chromium units a, are chosen in different wear zones according tothe wear-resistant property relationship; then, the biomimetic model of the guide rail surface is determined according to a set wear-resistant property increase amplitude after the discarded guide rail is repaired; when the increase amplitude M% is 20-40%, an A class biomimetic model formed by strip-shaped units which are parallel with each other is chosen; and when the increase amplitude M% is 40-60%, a B class biomimetic model formed by mesh units is chosen. The non-even repair range of the discarded guide rail is increased; and at the same time, the obtained guide rail surface formed by the combination of different biomimetic surfaces has various wear-resistant properties, and compared with single laser melting repair, the performance of the guide rail repaired by the method is better.

Description

technical field [0001] The invention belongs to the technical field of regeneration of waste cast iron guide rails, and relates to a method for repairing non-uniformly worn guide rail surfaces by melting chromium and melting carbon. Background technique [0002] As the development basis of modern industrial manufacturing, machine tools play an irreplaceable role in the field of modern industrial processing. The guide rail is a track set to make the machine tool move according to the prescribed trajectory and bear the gravity and load. It is one of the key components of the machine tool. The machining accuracy and service life of the machine tool are directly related to the guiding accuracy, wear resistance and low-speed running stability of the guide rail. In the actual production process, because the guide rail is integrated with the bed, the scrapping of the machine tool is often caused by the serious failure of the guide rail. Machine tool guide rails are usually made o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00
CPCB23P6/00
Inventor 周宏杨林张鹏周倜隋琦甘霖袁玉环
Owner JILIN UNIV
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