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Production method of cold extrusion gear wire rod

A production method and technology of gear discs, applied in the field of metallurgy, can solve problems such as low machining accuracy, high energy consumption, and low utilization rate of cutting materials, and achieve the effects of improving production efficiency, saving steel, and increasing investment and production costs

Inactive Publication Date: 2018-03-20
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional production methods of straight column gears are mainly cutting and forging, the utilization rate of cutting materials is low, and forging is a process with high energy consumption and low machining accuracy.

Method used

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  • Production method of cold extrusion gear wire rod
  • Production method of cold extrusion gear wire rod
  • Production method of cold extrusion gear wire rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The production method of cold extruded gear wire rod, the chemical composition of steel is: C=0.1923%, Si=0.2617%, Mn=1.01%, P=0.010%, S=0.021%, Cr=1.084%, Ti =0.067, Ni=0.020%, Cu=0.024%, B=0.0.0003%, Mo=0.0056%, Al=0.020%, and the rest are Fe and unavoidable impurities. Key process steps include:

[0026] Smelting: Converter tapping P=0.008%, adopting LF+VD refining process, argon blowing throughout the LF furnace refining, slag deoxidation, white slag retention time 21min; VD vacuum degassing treatment, vacuum degree below 0.5tor, vacuum retention time At 23 minutes, N=51ppm, H=1.0ppm, O=14ppm of the outbound molten steel.

[0027] Continuous casting: full protection casting is adopted, the superheat of the tundish is 24°C, and the cross section of the billet is 150 mm×150 mm.

[0028] Heating: temperature 1040~1050℃, soaking time 35min.

[0029] Rolling: KOCKS temperature is 850°C, crimping temperature is 820°C.

[0030] Cooling: Fast cooling is adopted after cu...

Embodiment 2

[0033] For the production method of cold extruded gear wire rod, the chemical composition of steel is: C=0.1866%, Si=0.2690%, Mn=1.020%, P=0.012%, S=0.022%, Cr=1.081%, Ti =0.061, Ni=0.022%, Cu=0.021%, B=0.0.0003%, Mo=0.0046%, Al=0.018%, and the rest are Fe and unavoidable impurities. Key process steps include:

[0034] Smelting: Converter tapping P=0.009%, adopting LF+VD refining process, argon blowing throughout the LF furnace refining, slag deoxidation, white slag retention time 22min; VD vacuum degassing treatment, vacuum degree below 0.5tor, vacuum retention time 20min, soft blowing time 23min, outbound molten steel N=51ppm, H=1.5ppm, O=16ppm.

[0035] Continuous casting: full protection casting is adopted, the superheating degree of the tundish is 22°C, and the section of the billet is 150 mm×150 mm.

[0036] Heating: temperature 1030~1040℃, soaking time 35min.

[0037] Rolling: KOCKS temperature is 860°C, crimping temperature is 840°C.

[0038] Cooling: Fast cooling ...

example 3

[0041] For the production method of cold extruded gear wire rod, the chemical composition of steel is: C=0.1839%, Si=0.2595%, Mn=1.006%, P=0.011%, S=0.018%, Cr=1.084%, Ti =0.064, Ni=0.028%, Cu=0.025%, B=0.0.0003%, Mo=0.0066%, Al=0.019%, and the rest are Fe and unavoidable impurities. Key process steps include:

[0042] Smelting: Converter tapping P=0.007%, adopting LF+VD refining process, LF furnace refining full-process argon blowing, slag deoxidation, white slag retention time 24min; VD vacuum degassing treatment, vacuum degree below 0.5tor, vacuum retention time 21min, soft blowing time 25min, outbound molten steel N=54ppm, H=1.5ppm, O=15ppm.

[0043]Continuous casting: full protection casting is adopted, the superheat of the tundish is 23°C, and the cross section of the billet is 150 mm×150 mm.

[0044] Heating: temperature 1030~1040℃, soaking time 34min.

[0045] Rolling: KOCKS temperature 870°C, crimping temperature 850°C.

[0046] Cooling: Fast cooling is adopted af...

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Abstract

The invention discloses a production method of a cold extrusion gear wire rod. Steel comprises the following chemical components in percentage by weight: 0.17-0.23% of C, 0.15-0.35% of Si, 0.80-1.15%of Mn, P not more than 0.015%, S not more than 0.015-0.025%, 1.00-1.30% of Cr, 0.03-0.08% of Ti, Ni not more than 0.25%, Cu not more than 0.20%, B not more than 0.0003%, Mo not more than 0.05%, Al notmore than 0.025%, and the balance of Fe and inevitable impurities. Key process steps comprise smelting, continuous casting, heating, rolling and cooling. The invention creates a low-carbon high-alloying-component design system, and adopts a LF+VD compound refining technology; the produced wire rod can achieve the yield strength above 100 Mpa and the normal-temperature impact toughness above 100 Jin the heat treatment mechanical performances; the terminal hardenability control is stable; each index of the heat treatment after cold extrusion gear molding meets the requirements; the gear deformation condition in the heat treatment cannot occur; and the production method can be widely applied to the mechanical manufacturing and vehicle industry.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a production method of a cold extruded gear wire rod. Background technique [0002] The traditional production methods of straight column gears are mainly cutting and forging. The utilization rate of cutting materials is low, and forging is high energy consumption processing with low processing accuracy. Cold extrusion processing can achieve less or no cutting processing and normal temperature processing, which is an effective way to achieve energy saving and emission reduction. Using cold extrusion to produce gears can save 20% to 30% of steel than machining gears, and can reduce costs by about 25%. China is a big gear producing country, and the use of cold extrusion for gears is the development trend of the gear industry. Therefore, the development of gear steel wire rods suitable for cold extrusion processing is of great significance to promote the development of green and l...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/28C21C7/06C21C7/10B22D11/115
CPCC22C38/02B22D11/115C21C7/06C21C7/10C21C2007/0093C22C38/04C22C38/28
Inventor 彭光健罗登罗卫国肖冬周国子陈立杨瑞文
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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