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Preparation method of surface abrasion-resistant coating of floating clamping jaw of numerical control punching machine

A technology of CNC punching and wear-resistant coating, applied in coating, metal material coating process, melt spraying and other directions, can solve problems such as sheet metal deformation, and achieve improved density, good fluidity, and small angle of repose Effect

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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the problem that the dovetail groove structure of the traditional CNC punch floating clamp will cause local deformation of the sheet during the clamping process, and to provide a method for preparing a wear-resistant coating on the surface of the CNC punch floating clamp

Method used

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  • Preparation method of surface abrasion-resistant coating of floating clamping jaw of numerical control punching machine
  • Preparation method of surface abrasion-resistant coating of floating clamping jaw of numerical control punching machine
  • Preparation method of surface abrasion-resistant coating of floating clamping jaw of numerical control punching machine

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Effect test

Embodiment 1

[0033] A method for preparing a wear-resistant coating on the surface of a floating clamp of a numerically controlled punching machine is carried out according to the following steps:

[0034] 1) Use acetone to ultrasonically clean the surface of the floating clamp of the CNC punch to remove impurities such as oil, rust, etc., and dry it immediately after cleaning to prevent rust.

[0035] 2) Use brown corundum sand with a particle size of 24 mesh to carry out sandblasting roughening treatment on the surface of the CNC punch floating clamp to be sprayed to improve the bonding strength between the coating and the substrate, and the surface roughness after roughening is required to be no less than Ra 7.0.

[0036] 3) The composition (mass percentage) of the mixed powder for spraying is: chromium oxide ceramic powder: 80%; spherical glass powder: 20%.

[0037] 4) Weigh the chromium oxide ceramic particles and spherical glass powder according to the composition ratio of the compos...

Embodiment 2

[0044] The difference from Example 1 is that the low melting point additive in step 3) is lithium oxide.

[0045] In order to ensure that lithium oxide and chromium oxide are evenly mixed, the powder mixing is carried out according to step 4) in Example 1. In step 6), the porosity of the coating is 8%, which is much lower than the 12% of the pure chromium oxide coating. In step 7), HV 0.1 The Vickers hardness is 1550. In step 8), the sprayed chromium oxide coating has a friction coefficient of 0.78 and a wear rate of 8.132×10 -6 mm 3 / N m, much higher than the friction coefficient (0.69) and wear rate (4.06×10 -6 mm 3 / N·m).

Embodiment 3

[0047] The difference from Example 1 is that the low melting point additive in step 3) is alumina.

[0048] In order to ensure that the alumina and chromium oxide are evenly mixed, the powder mixing is carried out according to step 4) in Example 1. In step 6), the porosity of the coating is 4%, which is much lower than the 12% of the pure chromium oxide coating. In step 7), HV 0.1 The Vickers hardness is 1630. In step 8), the sprayed chromium oxide coating has a friction coefficient of 0.78 and a wear rate of 8.132×10 -6 mm 3 / N m, much higher than the friction coefficient (0.72) and wear rate (5.32×10 -6 mm 3 / N·m).

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Abstract

The invention discloses a preparation method of a surface abrasion-resistant coating of a floating clamping jaw of a numerical control punching machine. Firstly, chromium oxide ceramic particles and alow-melting-point additive are weighed according to the proportion of the coating and are evenly mixed; and then the high-performance abrasion-resistant coating is prepared on the surface of the clamping jaw after sand blasting through an atmospheric plasma spraying technology. The method solves the problem that a dovetail groove structure is used in a traditional floating clamping jaw of the numerical control punching machine and accordingly a plate is locally deformed in the clamping process. The low-melting-point glass powder additive in the mixed powder is of a unique spherical structure,so that the fluidity is better, the repose angle formed due to stacking is smaller, and material mixing is more uniform; a base material and a filler can be sufficiently dense, the density of the prepared coating is greatly improved, and problems of the pure chromium oxide coating in the using process are effectively solved, so that the tribology performance of the coating is better, the servicelife is longer, and the preparation cost is lower; and the thermal influence of the spraying process on the floating clamping jaw of the numerical control punching machine is small, and the structureand shape of a base body are not changed.

Description

technical field [0001] The invention relates to the fields of thermal spraying technology, surface engineering and material science, in particular to a method for preparing a wear-resistant coating on the surface of a floating clamp of a numerically controlled punch. Background technique [0002] Wear, corrosion and fracture are the three main forms of material failure, among which wear caused by friction is the main reason for the failure of floating clamps of CNC punching machines. Therefore, the selection of clamp production materials and the optimization of processing technology should be considered comprehensively in the design of the clamp to prolong its continuous working time. At the same time, the floating clamp of the CNC punching machine usually adopts a dovetail groove structure to increase the frictional resistance when clamping the plate. However, the traditional dovetail groove structure has certain limitations during use. For example, when the clamping force...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/11
CPCC23C4/11C23C4/134
Inventor 张皓徐金勇卢玉灵刘可为魏新龙肖金坤张超
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