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Repairing method of screw blade of expansion dryer

A technology of expansion dryer and spiral blade, which is applied in the direction of manufacturing tools, welding equipment, arc welding equipment, etc., can solve the problems of large heat input in electric welding, loss of repair, and non-wearable surface, so as to achieve high maintenance efficiency and low thermal impact The effect of small area and cost saving

Active Publication Date: 2018-10-12
浙江翰德圣智能再制造技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material of the spiral blade is stainless steel, and the surface is not wear-resistant. The traditional method is electric welding of Stellite alloy. The heat input of electric welding is relatively large, and a transition layer is required. The surfacing layer is easy to crack, and the blade body and inner hole of the spiral blade will also be damaged. Deformed and lose the meaning of repair

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this embodiment, the chemical composition of the spiral blade of the expansion dryer is as follows: C0.02, Mn2.0, Cr18.00, Ni10.00, Ti0.15, and Fe. The repair method includes the following steps:

[0029] (1) Determine the repair plan according to the damage degree of the spiral blade of the expansion dryer;

[0030] (2) Remove the fatigue layer of the mating surface of the worn spiral blade;

[0031] (3) Composite process additive quenching;

[0032] (4) Relief of stress in the surfacing layer;

[0033] (5) Finishing.

[0034] In step (1), the helical blade is disassembled from the main shaft, cleaned with a cleaning agent, and inspected for cracks, surface defects, and dimensional accuracy of relevant inner holes to determine a repair plan.

[0035] In step (2), the spiral blade is installed on a lathe, and the worn outer diameter matching surface is turned off to expose fresh metal, and then the surface coloring flaw detection is carried out until there is no d...

Embodiment 2

[0041] In this embodiment, the chemical composition of the spiral blade of the expansion dryer is as follows: C0.01, Mn1.5, Cr17.00, Ni9.00, Ti0.1, and Fe. The repair method includes the following steps:

[0042] (1) Determine the repair plan according to the damage degree of the spiral blade of the expansion dryer;

[0043] (2) Remove the fatigue layer of the mating surface of the worn spiral blade;

[0044] (3) Composite process additive quenching;

[0045] (4) Relief of stress in the surfacing layer;

[0046] (5) Finishing.

[0047] In step (1), the helical blade is disassembled from the main shaft, cleaned with a cleaning agent, and inspected for cracks, surface defects, and dimensional accuracy of relevant inner holes to determine a repair plan.

[0048] In step (2), the spiral blade is installed on a lathe, and the worn outer diameter matching surface is turned off to expose fresh metal, and then the surface coloring flaw detection is carried out until there is no def...

Embodiment 3

[0054] In this embodiment, the chemical composition of the spiral blade of the expansion dryer is as follows: C0.03, Mn2.2, Cr18.50, Ni11.70, Ti0.23, and Fe. The repair method includes the following steps:

[0055] (1) Determine the repair plan according to the damage degree of the spiral blade of the expansion dryer;

[0056] (2) Remove the fatigue layer of the mating surface of the worn spiral blade;

[0057] (3) Composite process additive quenching;

[0058] (4) Relief of stress in the surfacing layer;

[0059] (5) Finishing.

[0060] In step (1), the helical blade is disassembled from the main shaft, cleaned with a cleaning agent, and inspected for cracks, surface defects, and dimensional accuracy of relevant inner holes to determine a repair plan.

[0061] In step (2), the spiral blade is installed on a lathe, and the worn outer diameter matching surface is turned off to expose fresh metal, and then the surface coloring flaw detection is carried out until there is no d...

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Abstract

The invention belongs to the field of repair of special screw blades for after-treatment processing of the rubber industry and relates to a repairing method of a screw blade of an expansion dryer. Themethod aims at repairing a part provided with the screw blade with wear and cracks in a long-term operating process. The method comprises steps as follows: firstly, a fatigue layer at a wearing portion of a damaged screw blade matching surface is removed, then an iron-based alloy welding wire with the mechanical property of a base material is selected, additive manufacturing and quenching are performed simultaneously with a cold metal transition and laser cladding compound technology, residual stress in the part after cladding is removed with a pneumatic vibrator method, finally, the part isenabled to restore to the designed size with a precision machining method, and the using performance of the screw blade is restored accordingly. The screw blade of the expansion dryer is subjected toadditive manufacturing repair, the base material keeps at the lower temperature all the time in the additive manufacturing process, and part deformation is almost zero; an obtained additive manufacturing layer is metallurgically bonded with the base material, the automation efficiency is high, and the cost is lower.

Description

technical field [0001] The invention belongs to the field of repairing special helical blades in post-processing in the rubber industry, and relates to a method for repairing the helical blades of an expansion dryer. Background technique [0002] Butadiene rubber is currently the main product of synthetic rubber production in China and the world, and is mainly used in the manufacture of tires. After the butadiene rubber is produced, it needs to be dried with a dryer. This dryer is used to dry the residual moisture in the butadiene rubber under the action of steam in the form of extrusion. The expansion dryer is an indispensable post-processing equipment in the butadiene rubber industry, and the spiral blade is the most important vulnerable part. To ensure that the operating unit does not stop during an overhaul period, it is necessary to ensure that the spiral blade has good wear resistance and corrosion resistance. The material of the spiral blade is stainless steel, and ...

Claims

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Application Information

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IPC IPC(8): B23P6/00B23K9/04C21D1/09
CPCB23K9/04B23P6/00C21D1/09
Inventor 韩旭谢玉江陈书曾增伟
Owner 浙江翰德圣智能再制造技术有限公司
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