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Hardness control method in steel roller welding process of steel coil decoiler

A welding process and hardness control technology, which is applied in heat treatment process control, manufacturing tools, heat treatment equipment, etc., to achieve the effects of improving hardness, low manufacturing cost, and short production cycle

Active Publication Date: 2011-04-13
JIER MACHINE TOOL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first method has the disadvantages of long manufacturing cycle and high production cost; the second method is difficult to control the quenching process, which is easy to cause surface cracks, resulting in overall scrap

Method used

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  • Hardness control method in steel roller welding process of steel coil decoiler
  • Hardness control method in steel roller welding process of steel coil decoiler
  • Hardness control method in steel roller welding process of steel coil decoiler

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0024] b. Quenching, the No. 45 steel pipe fittings are quenched before welding, the quenching temperature is 850°C, and the steel pipe fittings are tempered after quenching, the tempering temperature is 180°C;

[0025] c. Preheating, before welding, first preheat the welding area of ​​the steel pipe fittings to 150°C;

[0026] d. Welding, during the welding process, use the welding tool to fix the steel pipe fitting 1 vertically so as to be welded in the flat welding position, and install the water spray tool 3 at the end of the pipe fitting, so that the distance between the water nozzle and the end of the pipe fitting is 40mm , control the surface temperature of the pipe fittings at 170°C through water spray tooling 3, and control the temperature of the welding zone at 140°C during each welding;

[0027] e. Cooling. After the welding is completed, stop the cooling device when the temperature of the weld zone is 160°C, and let it cool down to room temperature.

[0028] For t...

specific Embodiment 2

[0041] b. Quenching, the steel pipe fittings are subjected to quenching treatment before welding, and the quenching temperature is 800°C;

[0042] c. Preheating, before welding, first preheat the welding area of ​​the steel pipe fittings to 140°C;

[0043] d. Welding, during the welding process, use the welding tool to fix the steel pipe fitting 1 vertically so that it can be welded in the flat welding position, and install the water spray tool 3 at the end of the pipe fitting, so that the distance between the water nozzle and the end of the pipe fitting is 40mm , control the surface temperature of the pipe fittings at 160°C by spraying water, and control the temperature of the welding zone at 130°C during each welding;

[0044] e. Cooling. After the welding is completed, stop the cooling device when the temperature of the weld zone is 150°C, and let it cool down to room temperature.

[0045] Relevant data measured during the test

[0046] The temperature measurement data wh...

specific Embodiment 3

[0060] b. Quenching, the steel pipe fittings are quenched before welding, the quenching temperature is 840°C, and the steel pipe fittings are tempered after quenching, the tempering temperature is 190°C;

[0061] c. Preheating, before welding, first preheat the welding area of ​​the steel pipe fittings to 170°C;

[0062] d. Welding, during the welding process, use the welding tool to fix the steel pipe fitting 1 vertically so that it can be welded in the flat welding position, and install the water spray tool 3 at the end of the pipe fitting, so that the distance between the water nozzle and the end of the pipe fitting is 40mm , control the surface temperature of the pipe fittings at 150°C through water spraying equipment, and control the temperature of the welding zone at 170°C during each welding;

[0063]e. Cooling. After the welding is completed, stop the cooling device when the temperature of the weld zone is 170°C, and let it cool down to room temperature.

[0064] Rele...

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PUM

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Abstract

The invention provides a hardness control method in the steel roller welding process of a steel coil decoiler, and the invention is specific by comprising the following steps: a. cleaning: carrying out cleaning before welding on the parts need to be welded on a steel pipe fitting and a shaft head which are taken as roller shaft bodies; b. quenching: carrying out quenching treatment before weldingon the steel pipe fitting at a quenching temperature of 780-900 DEG C; c. preheating: before welding, firstly preheating the welding zone of the steel pipe fitting to a range of 130-170 DEG C; d. welding: in the welding process, controlling the surface temperature of the fitting within 150-180 DEG C by a temperature drop device, and controlling the temperature of the welding zone within 120-150 DEG C in each welding; and e. cooling: after the completeness of welding, stopping the work of the temperature drop device when the temperature of the welding line zone is within 140-180 DEG C to slowly cool to room temperature. The invention has the following beneficial effects: (1) simple operation, low manufacturing cost and short production cycle; and (2) capability of effectively improving thesurface hardness of the processed workpiece and ensuring that the hardness is greater than or equal to unit HRC 53.

Description

technical field [0001] The invention relates to a welding process method for rollers of a steel plate uncoiling line, in particular to a method for controlling hardness during the welding process of steel rolls of a steel coil uncoiler that can ensure the hardness requirements of workpieces. Background technique [0002] At present, in order to ensure the surface hardness of the welded roller, two methods are usually used for production: one is to weld the No. 20 steel pipe with the shaft head, and nitriding treatment after finishing; Hardened, then surface ground. The first method has the disadvantages of long manufacturing cycle and high production cost; the second method is difficult to control the quenching process, which may easily cause surface cracks and lead to overall scrapping. Contents of the invention [0003] In order to overcome the disadvantages of the above-mentioned technical problems, the present invention provides a method for controlling the hardnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D9/08C21D11/00
Inventor 崔凯魏存启
Owner JIER MACHINE TOOL GROUP