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A laser repair method of moving cross head

A technology of laser repair and repair method, which is applied in the field of laser repair of moving crossheads, can solve the problems of microstructure phase transformation residual stress in the heat-affected zone of cracks, and achieves good creep limit, dense interface structure, good resistance to thermal fatigue and fracture performance effect

Active Publication Date: 2020-05-26
SHENYANG DALU LASER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, whether it is electric welding, argon arc welding, vibration welding and other thermal processing methods, it will inevitably produce harmful effects such as cracks, phase transformation of the heat-affected zone, and residual stress.

Method used

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  • A laser repair method of moving cross head
  • A laser repair method of moving cross head

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The 1810 line pc rolling mill of a steel factory moves the cross head.

[0020] Basic information: Specification: 680×1100mm; Weight: 1500kg / piece; Material: SCM440.

[0021] The repair method includes the following steps:

[0022] Step 1, the size detection and shape tolerance detection of the mobile cross head, the non-destructive testing detection and recording the wear thickness of the mobile cross head.

[0023] Step 2, mechanically clean the parts to be clad, and remove the oxide layer and fatigue layer.

[0024] Step 3: Carry out laser cladding repair on the mobile intersection head according to the detection results, and fuse the cladding material with the parent material of the mobile intersection head to form a cladding layer:

[0025] Fix the moving cross head on the laser CNC machine tool to ensure that the plane to be clad is basically in a horizontal state.

[0026] Step 3 needs to use laser cladding metal powder: Cr: 25%, Mo: 5%, W: 10%, Ti: 5%, Ta: 3%...

Embodiment 2

[0033] Comparative test between the present invention and traditional laser cladding process:

[0034] The method of the traditional laser cladding process is the same as that of Example 1, except that the parameters of the cladding process in step 3 are different. The specific parameters and test results are shown in the table below.

[0035]

[0036] The results show that through the laser cladding method of the present invention, the bonding strength between the parent material and the laser cladding layer is not lower than 90% of the original substrate; compared with the traditional cladding process, the cladding layer and its interface structure are denser , fine grains, no holes, slag inclusions, cracks and other defects; the surface hardness of the repair layer is HV350-450, which has high corrosion resistance and wear resistance, and has good creep limit, good durable strength and good resistance Thermal fatigue and fracture properties, therefore, are significantly ...

Embodiment 3

[0047] A laser repair method for moving a cross head, the repair method includes the following steps:

[0048] Step 1, mobile intersection head size detection, shape and position tolerance detection, non-destructive flaw detection;

[0049] Step 2, mechanically clean the mobile cross head, and remove the oxide layer and fatigue layer;

[0050] Step 3, according to the detection result, for the laser repair of the mobile intersection, the cladding material is fused with the parent material of the mobile intersection to form a cladding layer;

[0051] The process parameters of laser repair are: laser power 5000~5500W; spot diameter 10mm; spot moving speed 150mm / s; lap width 2.5mm; modified cladding layer thickness 2mm.

[0052] The laser cladding material is composed of the following components by weight: Cr: 30%, Mo: 8%, W: 15%, Ti: 7.5%, Ta: 5%, Al: 5%, and the balance of Co.

[0053] Step 4, machining of the mobile crosshead and detection after repair;

[0054] Step 5, qua...

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Abstract

The invention belongs to the field of equipment laser repairing, and particularly relates to a repairing method of a movable cross head. The repairing method includes the following steps that 1, dimension detection and form and location tolerance detection of the movable cross head and nondestructive test detection are carried out; 2, the movable cross head is mechanically cleaned, and an oxidation layer and a fatigue layer are completely removed; 3, the movable cross head is subjected to laser cladding repairing according to the detection result, a cladding material and a parent material of the movable cross head are fused, and a cladding layer is formed; and 4, the movable cross head is mechanically machined and detected after being repaired. The cladding layer and a basal body of the movable cross head are metallurgically bound, the bonding strength is not smaller than 90% that of an original base material, the surface layer corrosion and abrasion resistance is not lower than that of the original base material and a coating, the hardness can meet the working condition requirements of the movable cross head, the production cost is low, and the cost performance of the product is high.

Description

technical field [0001] The invention belongs to the field of equipment laser repair, and in particular relates to a laser repair method for moving a cross head. Background technique [0002] With the rapid development of the iron and steel industry today, with the continuous improvement of users' requirements for hot-rolled steel, countries have generally paid attention to the shape and crown control of strip steel. Nippon Steel and Mitsubishi Heavy Industries' PC (Pair Cross) rolling mill (paired roll crossing) has been widely used in my country's steel industry. As the core component of the PC rolling mill, the mobile cross head has high precision, complex manufacturing process, high production cost, long cycle time, and once there is a problem in operation, it will have a huge impact, so its quality requirements are very high. The mobile cross head is mainly used to install and adjust the whole set of roll train or roll adjustment device, and bear great rolling force. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C19/07
CPCC22C19/07C23C24/106
Inventor 吴伟李运强崔波
Owner SHENYANG DALU LASER TECH
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