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Manufacturing method of surface-quenching chromium-plating winded-welding roller

A manufacturing method and roll welding technology, which is applied in the field of metallurgical processing and manufacturing, can solve problems such as uneven roughness, easy cracks, and low weld hardness, and achieve the effects of saving rough materials, shortening the production cycle, and reducing manufacturing costs

Inactive Publication Date: 2008-03-05
MCC SFRE HEAVY IND EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for manufacturing a surface-hardened chrome-plated roll welded roll, which solves the problem that cracks are easily generated in the roll welded seam existing in the prior art; after surface quenching, the hardness of the weld seam is lower than that of the base metal of the roll body Hardness, uneven surface hardness and wall thickness of the roller body after finishing, uneven roughness of the outer circle after sandblasting and texturing

Method used

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  • Manufacturing method of surface-quenching chromium-plating winded-welding roller
  • Manufacturing method of surface-quenching chromium-plating winded-welding roller
  • Manufacturing method of surface-quenching chromium-plating winded-welding roller

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preparation example Construction

[0028] The preparation method of the existing surface quenching chrome-plated coil welding roller comprises the following steps,

[0029] a. Blanking and hot rolling: the roll body 1 is blanked with steel plate, and the roll body 1 is hot-bent after preheating to ensure that the inner circle size tolerance is ±5mm.

[0030] b. Welding and post-weld tempering heat treatment: use acetylene oxygen cutting groove butt welding, heat the welded roller body 1 to 500±5°C~550°C±5°C, keep it warm for 3±0.5 hours and then furnace cool.

[0031] c. Rough turning: turning the inner hole and outer circle of the roller body 1, and the surface roughness is above Ra6.3.

[0032] d. Surface quenching: the quenching temperature is 920℃~930℃±5℃, and the continuous quenching method is adopted.

[0033] e. Semi-finished turning: according to the outer circle of the blank of the roller body 1, it is accurately aligned to within 3mm, the outer circle of the turning is 2mm, and the inner holes at bot...

Embodiment 1

[0054] According to processing step of the present invention, implement under the following technical requirements and conditions,

[0055] a. Process the coil welding groove on the welding end of the blanked steel plate. The groove is a 30° V-shaped groove on one side, and then heat-bend the roll body 1 after preheating.

[0056] b. For the groove bottoming welding and groove processing in step a, a low carbon steel electrode is used for the bottoming of the weld, and the bottoming welding height C is 0.30 of the groove height, as shown in Figure 2. The side and bottom surface of the 60° flat bottom groove are planed and welded again to reach Ra12.5. Automatic welding is used. The top layer is surfacing with Gr-Mo alloy welding wire. The welded roll body 1 is heated to 850±5°C and kept for 3.5 hours. air cooled. After normalizing heat treatment, the roller body 1 is straightened to ensure that the outer circle has a tolerance of ±1mm.

[0057] c. Turn the inner hole and out...

Embodiment 2

[0064] According to processing step of the present invention, implement under the following technical requirements and conditions,

[0065] a. Process the coil welding groove on the welding end of the blanked steel plate. The groove is a 30° V-shaped groove on one side, and then heat-bend the roll body 1 after preheating.

[0066] b. For the groove bottoming welding and groove processing in step a, low carbon steel electrodes are used for the bottoming of the weld, and the bottoming welding height C is 0.35 of the groove height, as shown in Figure 2. The side and bottom surface of the 60° flat-bottomed groove shall reach Ra12.5 after planing for the second time. Automatic welding shall be adopted, and the top layer shall be surfacing with Gr-Mo alloy welding wire. The welded roll body 1 shall be heated to 850°C±5°C and kept for 3 hours. After air cooling. After normalizing heat treatment, the roller body 1 is straightened to ensure that the outer circle has a tolerance of ±1m...

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Abstract

The present invention discloses surface quenched chrome plated wound and welded roller making process, which includes the steps of hot winding, bottoming welding and processing bevel, coarse turning, surface quenching, semi-finish turning, assembling welding, finish machining and post-treatment. The process of the present invention is suitable for making roller of 500-1200 mm diameter, 25 mm wall thickness and 2050-2200 mm length, and roller surface is treated through quenching, sand blasting to roughen and chrome plating. The present invention has the advantages of saving in material, low making cost and short production period.

Description

technical field [0001] The invention belongs to the technical field of metallurgical processing and manufacturing, and relates to a method for processing and manufacturing tension rolls and steering rolls in continuous annealing and hot-dip galvanizing equipment in cold-rolled strip mills, and in particular to a method for manufacturing surface-quenched chrome-plated roll welding rolls. Background technique [0002] The continuous annealing unit and the hot-dip galvanizing unit are important technological transformation projects of the cold-rolled strip mills of my country's iron and steel enterprises, and the market potential is huge. There are many tension rolls and steering rolls of various structures in this unit, and the manufacturing quality of the rolls directly affects the precision and surface quality of the finished strip steel. Welded structure tension rollers and steering rollers with surface quenching + sand blasting + hard chrome plating on the roller surface h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K33/00C21D9/38C21D1/28C21D1/18C21D11/00
Inventor 牛宏堂惠渊博姚勇石雨
Owner MCC SFRE HEAVY IND EQUIP
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