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Method for repairing flywheels using nickel-cobalt-molybdenum-manganese-based alloys

A technology of manganese-based alloys and flywheels, which is applied to metal processing equipment, welding media, welding/cutting media/materials, etc., can solve the problems of difficult operation, complicated process, and inability to repair with flywheels, and achieve good repair effect and repair The process is simple and the effect of improving fatigue damage resistance

Active Publication Date: 2016-08-24
青岛海之冠汽车配件制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, this method is mainly suitable for welding and repairing the base of large equipment with thick workpieces, and cannot be used for repairing flywheels; moreover, the process is relatively complicated and the operation is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The material of the flywheel is gray cast iron, the crack depth is 25mm, the crack length is about 120mm, and the crack length is about 120mm;

[0032] The patching method includes the following steps:

[0033] The first step is to grind the groove along the direction of the crack with the crack as the center; along the direction perpendicular to the groove, mill out several grooves at intervals; among them, the depth of the groove is 30mm, and the depth of the groove is 15mm;

[0034] The second step is to drill through holes with the start and end points of the crack as the center of the circle, and the hole diameter is 10mm;

[0035] The third step is to use chromium-nickel stainless steel electrodes to surfacing in the groove, and the surfacing height is 10mm;

[0036] During the welding process, each layer of welding should be tapped to remove welding slag and coating;

[0037] In the fourth step, the flywheel is preheated to 650 degrees, and the molten nickel-co...

Embodiment 2

[0041] The flywheel is made of gray cast iron with a crack depth of 30mm and a crack length of about 220mm;

[0042] The patching method includes the following steps:

[0043] The first step is to grind the groove along the direction of the crack with the crack as the center; along the direction perpendicular to the groove, mill out several grooves at intervals; among them, the groove depth is 35mm, the groove depth is 12mm, and the groove depth is 12mm. The slot length is 15mm;

[0044] The second step is to drill through holes with the start and end points of the crack as the center of the circle, and the hole diameter is 10mm;

[0045] The third step is to use chrome-nickel stainless steel electrodes to surfacing in the groove, and the surfacing height is 20mm;

[0046] During the welding process, each layer of welding should be tapped to remove welding slag and coating;

[0047] In the fourth step, the flywheel is preheated to 750 degrees, and the molten nickel-cobalt-m...

Embodiment 3

[0051] The flywheel is made of gray cast iron, with cracks running through it, the crack depth is 30mm, and the crack length is about 220mm;

[0052] The patching method includes the following steps:

[0053] The first step is to grind the grooves on the upper and lower surfaces of the flywheel along the direction of the cracks with the crack as the center; along the direction perpendicular to the grooves, mill out several grooves at regular intervals; among them, the depth of the upper and lower grooves Both are 15mm, the depth of the upper and lower grooves is 10mm, and the length of the groove is 30mm;

[0054] The second step is to drill a through hole with the starting point of the crack as the center, and the hole diameter is 10mm;

[0055] The third step is to use chromium-nickel stainless steel electrodes to surfacing in the groove, and the surfacing height is 8mm;

[0056] During the welding process, each layer of welding should be tapped to remove welding slag and ...

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Abstract

The invention discloses a method for repairing a flywheel by using nickel-cobalt-molybdenum-manganese-base alloy. The method comprises the following steps that firstly, a groove is polished in the trend of a crack with the crack as the center, a plurality of slots are milled every other certain distance in the direction perpendicular to the groove, and the depth of the slots is larger than or equal to one third of that of the groove; secondly, through holes are drilled with the starting position and the ending position of the crack as centers of circles respectively; thirdly, bead welding is conducted in the slots with stainless steel electrodes, and the bead welding height is half or two thirds of the depth of the groove; fourthly, the flywheel is preheated to 600-800 DEG C, the nickel-cobalt-molybdenum-manganese-base alloy in the molten state is poured into the residual space of the through holes and the groove, and cooling is conducted at the room temperature; fifthly, surplus bead welding materials and poured materials are removed through machining until the size is qualified. The method is simple in repairing technology and good in repairing effect, the repaired flywheel is long in service life, and the method is suitable for crack mass repairing.

Description

technical field [0001] The invention relates to a method for repairing cracks in cast parts, in particular to a method for repairing flywheels by using a nickel-cobalt-molybdenum-manganese base alloy. Background technique [0002] The flywheel is mainly made of cast iron, and the manufacturing process is generally to first cast the embryo and then machine it. Considering the production cost, the grade of the cast iron blank for manufacturing the flywheel is relatively low. Due to the high carbon content in the material itself, the flywheel is prone to cracks due to fatigue damage under the action of frequent alternating switching between high and low speeds for a long time , and then damaged. [0003] The prior art generally adopts the processing method of dismantling the old and replacing the old with a new one to carry out maintenance. [0004] With the continuous increase of car ownership, the number of waste flywheels replaced every year is very large. Once cracks appe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P6/00B23K31/02B23K35/30
CPCB23P6/04
Inventor 王伟李秀珍王彩云樊恩力孟庆福张程海
Owner 青岛海之冠汽车配件制造有限公司
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