Process and equipment for precise spray forming and layer-by-layer rolling repair and manufacturing

A spray forming and precision technology, applied in the field of precision spray forming-layer-by-layer rolling repair and manufacturing process and its equipment, can solve the problems of damaged wheel shape and dimensional accuracy, poor bonding, low metal spraying efficiency, etc.

Inactive Publication Date: 2009-10-07
杨云峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Spray forming can coat or plate a layer of metal on the metal substrate at high speed, but this coating generally has a porosity of 0.5-2%, which is difficult to meet the mechanical performance requirements of the wheel
If the scrapped wheels are clad and then subjected to overall rolling or other hot pressing processing, the shape and dimensional accuracy of the parts that do not need to be repaired will be damaged, and at the same time, it will cause a large waste of energy and other processing costs
[0004] Also have the method for repairing workpiece by metal thermal spraying process at present, but the bonding of its metal coating and the original workpiece base is poor, the porosity in the metal coating is more than 5%, and the metal spraying efficiency of single nozzle is low (only 100% in addition) g / min order of magnitude), large area spraying will generate excessive thermal stress, so it cannot be used for the repair of large metal parts working under high load

Method used

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  • Process and equipment for precise spray forming and layer-by-layer rolling repair and manufacturing
  • Process and equipment for precise spray forming and layer-by-layer rolling repair and manufacturing
  • Process and equipment for precise spray forming and layer-by-layer rolling repair and manufacturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] For example figure 2 The 138 mm wide rim 1 shown was spray coated, rolled and a sample of the metallic coating 10 was produced. Finally, two samples were obtained: sample 1-4 and sample 2-4. The rim and cladding metals are standard railway wheel steels whose composition is shown in Table 1. In addition, the same rim is only sprayed and coated without rolling, and another sample is made: comparative sample 1-1, to compare the superiority of the present invention.

[0108] The preparation methods of sample 1-4 and sample 2-4 are as follows:

[0109] The surface of the rim 1 is cleaned and processed; its surface is heated by induction under the protection of an inert gas (nitrogen), and the surface heating temperature is controlled at 1200° C.; the molten metal is atomized by a high-pressure inert gas (10 atmospheres) and sprayed and deposited on the The cladding metal is obtained on the surface of the cladding workpiece, and at the same time, the cladding metal is rol...

Embodiment 2

[0117] figure 1 It is a schematic diagram of the process and equipment of the present invention. Take the repair of a pair of railway wheels 1 as an example, they were scrapped due to outer circle wear.

[0118] A spray chamber 2 is provided in the equipment, and a spray unit 100 is arranged on the top of the spray chamber 2. The spray unit 100 includes: a liquid metal smelting preparation or supply device 5; the metal liquid smelting preparation or supply device 5 provides a molten metal 7; An inert gas atomization injection device 8 is arranged downstream of the liquid smelting preparation or supply device 5; the inert gas atomization injection device 8 makes the molten metal 7 atomized and sprayed onto the workpiece (that is, the wheel) 1 to be coated A metal coating 10 is formed.

[0119] The lower part of the spray chamber 2 is provided with a layer-by-layer rolling repair and manufacturing unit 200, including: a heating device 3 located around the workpiece 1 to be coa...

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PUM

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Abstract

The invention provides a method for precise spray forming and layer-by-layer rolling repair and manufacturing, which is used for rapidly and densely repairing and remanufacturing the surface of workpiece to be cladded. The method comprises the following steps: the surface of the workpiece to be cladded is cleared and/or processed; the surface of the workpiece to be cladded is induced and heated under the protection of inert gas; molten metal is atomized by high-pressure inert gas and sprayed and deposited on the surface of the workpiece to be cladded to obtain cladding metal, and the cladding metal is rolled layer by layer and thickened simultaneously; the workpiece clad by metal is mechanically processed and thermally treated and the workpiece processed by precise spray forming and layer-by-layer rolling repair or manufacturing is obtained. The invention also provides a device for spray forming and layer-by-layer rolling repair and manufacturing.

Description

technical field [0001] The invention relates to a precision injection forming-layer-by-layer rolling repair and manufacturing process and equipment thereof. Background technique [0002] Many mechanical parts are scrapped due to a small amount of partial wear, such as railway wheels, metallurgical rolls, major shafts, and so on. Take the railway wheel as an example, because it will wear out due to rail friction, brake friction and other factors during operation. Railway vehicles are still the main means of transportation of passengers and goods in the world. There are tens of millions of wheels that are scrapped due to wear and tear every year in the world, and there is no practical way to repair them at present. Remaking the wheel consumes a lot of human and material resources, including natural resources such as energy and transportation capacity. [0003] Spray forming can clad or plate a layer of metal on the metal substrate at high speed, but this coating generally ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/115B22F3/24
Inventor 杨云峰
Owner 杨云峰
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