Unlock instant, AI-driven research and patent intelligence for your innovation.

Surface overlaying and processing method for pinch roller manufacturing and repairing

A technology of surface welding and heat treatment methods, which is applied in heat treatment furnaces, manufacturing tools, heat treatment equipment, etc., can solve the problem that it is difficult to meet the requirements of surface hardness, high temperature impact toughness and wear resistance, pinch roller yield and service life. , Overlay welding metal is easy to produce cracks and other problems, to achieve the effect of good machinability, low cost and excellent mechanical properties

Inactive Publication Date: 2012-10-24
武汉宇宙科技有限公司
View PDF7 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the manufacturing and repairing process of the pinch roller, due to the high hardness, impact toughness and high temperature wear resistance requirements of the hard surface layer, high alloy steel welding materials are required, and it is difficult to balance the surface hardness and high temperature during the surfacing process. The problem of impact toughness and wear resistance, or the high temperature performance meets the requirements, but the surface hardness is low, or the surface hardness meets the requirements, but the surfacing metal is prone to cracks, which makes the yield and service life of the pinch roller difficult to meet the requirements

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A surface surfacing and heat treatment method in the manufacture and repair of pinch rollers, including the steps of rough turning, preheating, surfacing metal, and annealing,

[0037] In the preheating step, first heat the pinch roller at a rate of 50°C per hour, heat it to 300°C and then keep it warm for 2 hours, then continue to heat it up to 400°C at a rate of 50°C per hour, and keep it warm for 10 hours;

[0038] In the surfacing metal step, the flux-cored welding wire is used to match the HJ260 smelting flux purchased from Shanghai Flux Factory for surfacing, the thickness of the surfacing metal is 20 mm, and the interlayer temperature of the surfacing layer metal is 330 ° C, wherein, The flux-cored welding wire includes a carbon steel sheath and a flux core, the carbon steel sheath is H08A steel strip, and the mass % of the flux core raw material components is: micro-carbon ferrochrome 28%, ferrosilicon 7.0%, metal 7.0% manganese, 12% nickel powder, 6.0% ferro-tu...

Embodiment 2

[0042] A surface surfacing and heat treatment method in the manufacture and repair of pinch rollers, including the steps of rough turning, preheating, surfacing metal, and annealing,

[0043] In the preheating step, first heat the pinch roller at a rate of 20°C per hour, heat it to 310°C and then keep it warm for 3 hours, then continue to heat it up to 380°C at a rate of 20°C per hour and keep it warm for 12 hours;

[0044] In the surfacing metal step, the flux cored wire is used to match the HJ260 smelting flux purchased from Shanghai Flux Factory for surfacing, the thickness of the surfacing metal is 10 mm, and the interlayer temperature of the surfacing layer metal is 320 ° C, wherein, The flux-cored welding wire includes a carbon steel sheath and a flux core, the carbon steel sheath is H08A steel strip, and the mass % of the flux core raw material components is: micro-carbon ferrochrome 27%, ferrosilicon 6.5%, metal 6.5% manganese, 11% nickel powder, 5% ferro-tungsten; 7% ...

Embodiment 3

[0048] A surface surfacing and heat treatment method in the manufacture and repair of pinch rollers, including the steps of rough turning, preheating, surfacing metal, and annealing,

[0049] In the preheating step, first heat the pinch roller at a rate of 40°C per hour, heat it to 350°C and keep it warm for 1.5 hours, then continue to heat it up to 450°C at a rate of 40°C per hour, and keep it warm for 8 hours;

[0050] In the surfacing metal step, the flux-cored welding wire is used to match the HJ260 smelting flux purchased from Shanghai Flux Factory for surfacing, the thickness of the surfacing metal is 30 mm, and the interlayer temperature of the surfacing layer metal is 350 ° C, wherein, The flux-cored welding wire includes a carbon steel sheath and a flux core, the carbon steel sheath is H08A steel strip, and the mass % of the flux core raw material components is: micro-carbon ferrochrome 30%, ferrosilicon 7%, metal 8% manganese, 12% nickel powder, 5.5% ferro-tungsten, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a surface overlaying and processing method for pinch roller manufacturing and repairing. The method comprises the following steps of: firstly, heating a pinch roller to be at 300-350 DEG C, keeping the temperature for 1.5-3 hours, further continuously heating to be at 380-450 DEG C and keeping the temperature for 8-12 hours; subsequently carrying out overlaying by adopting a flux-cored wire in a half Harvard furnace or a Harvard furnace, wherein flux-cored materials in the flux-cored wire comprise the following ingredients by weight percentage: 26-30% of micro-carbon ferro chrome, 6.0-7% of silicon iron, 6.0-8% of manganese metal, 10-12% of nickel powder, 4.0-6% of ferrotungsten, 6.0-8% of ferromolybdenum and the balance of iron powder; putting the pinch roller into an annealing furnace; heating the pinch roller to be at 300-350 DEG C and keeping the temperature for 1.5-3 hours; further heating to be at 450-500 DEG C and keeping the temperature for 15-30 hours; and cooling to be at the room temperature along with the furnace. The hard-face layer hardness of the surface of the pinch roller can be up to 55HRC+ / -2HRC; the properties of high temperature abrasion resistance, shock resistance and fatigue resistance of the pinch roller are improved greatly; and the service life is relatively long.

Description

technical field [0001] The invention relates to a surfacing welding treatment method on the surface of a roll, in particular to a surface surfacing and heat treatment method in the manufacture and repair of pinch rolls. It is suitable for surfacing and heat treatment of the surface of the pinch roll of the hot rolling coiler. Background technique [0002] The pinch roll is an important part of the steel rolling equipment, and the surface temperature of the pinch roll is generally 550-650°C during operation. This requires that the surface of the pinch roller not only has high hardness, fatigue resistance, impact resistance and other properties, but also has good high temperature wear resistance. In order to improve the service life of the pinch roller, a layer of hard surface material meeting the above-mentioned properties is usually used to overlay the surface of the pinch roller base material. At the same time, during the working process of the rolling mill, the pinch rol...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/235B23K35/30B23P15/00C21D1/26C21D9/38
Inventor 李浩肖锐钟毅李正朝余圣甫卢业梅
Owner 武汉宇宙科技有限公司