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Flywheel crack repair method

A technology of cracks and flywheels, which is applied in the field of repairing cracks in cast workpieces. It can solve the problems of difficult operation, inability to repair with flywheels, complicated process, etc., achieve good repair effect, improve fatigue resistance and simple repair process.

Active Publication Date: 2014-11-26
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 flywheel is made of gray cast iron with a crack depth of 25mm and a crack length of 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 groove depth is 30mm, the groove depth is 15mm, and the groove depth is 15mm. The slot length is 20mm;

[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; during the welding process, each layer of welding is knocked to remove welding slag and coating;

[0036] The fourth step is to preheat the flywheel to 650 degrees, and pour molten nickel-cobalt-molybdenum-mangan...

Embodiment 2

[0040] The flywheel is made of gray cast iron with a crack depth of 30mm and a crack length of about 220mm;

[0041] The patching method includes the following steps:

[0042] 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;

[0043] 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;

[0044] The third step is to use chromium-nickel stainless steel electrodes to surfacing in the groove, and the surfacing height is 20mm; during the welding process, each layer of welding is knocked to remove welding slag and coating;

[0045] The fourth step is to preheat the flywheel to 750 degrees, and pour molten nickel-cobalt-molybdenum-mangan...

Embodiment 3

[0049] 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;

[0050] The patching method includes the following steps:

[0051] 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 10m, and the length of the groove is 30mm;

[0052] 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;

[0053] The third step is to use chromium-nickel stainless steel electrodes to surfacing in the groove, and the surfacing height is 8mm; during the welding process, each layer is welded, and the welding slag and coating are removed by tapping...

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Abstract

The invention discloses a flywheel crack repair method. The flywheel crack repair method includes the following steps of firstly, conducting grinding in the direction of a crack with the crack as the center to form a groove, and conducting milling at certain intervals in the direction perpendicular to the groove to form a plurality of ditch grooves, wherein the depth of the ditch grooves is larger than or equal to one third of the depth of the groove; secondly, drilling through holes with the starting point and the ending point of the crack as the circle centers; thirdly, conducing bead welding in the ditch grooves through stainless steel electrodes, wherein the height of bead welding ranges from one half to two thirds of the depth of the ditch grooves; fourthly, preheating a flywheel to the temperature of 600 DEG C to 800 DEG C, pouring molten-state nickel-cobalt- molybdenum-manganese-base alloy into the rest of the space of the through hole and the rest of the space of the groove, and conducting cooling at the room temperature; fifthly, machining and removing the redundant dead welding material and the redundant pouring material till the size is qualified. The flywheel crack repair method is simple in repair process and good in repair effect; the repaired flywheel is long in service life, and the flywheel crack repair method is suitable for repairing the crack of the flywheel in batches.

Description

technical field [0001] The invention relates to a method for repairing cracks in cast parts, in particular to a method for repairing cracks in flywheels. 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 appear, they can only be used as scrap iron raw mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00
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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