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Method for restoring threaded hole of locomotive axle box pull rod seat

A repair method and threaded hole technology, which is applied in the field of repairing the threaded hole of the locomotive axle box tie rod seat, can solve the problems that the threaded hole does not meet the requirements of the drawing, the threaded hole of the tie rod seat is subjected to a large force, and the strength of the tie rod seat is reduced. The effect of ensuring the quality of maintenance and reducing labor intensity

Inactive Publication Date: 2016-05-04
CRRC LUOYANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the first two-year inspection process of the locomotive, the unqualified rate of the bolt holes of the axle box tie rod seat was about 19%. Because the locomotive was in operation, due to the heavy load and the harsh operating environment, the threaded holes of the tie rod seat were stressed, resulting in During the second two-year inspection of the locomotive, the unqualified rate of the bolt holes of the axle box tie rod seat was about 57%, and a large number of threaded holes did not meet the requirements of the drawing
In the prior art, the maintenance process for unqualified bolt holes is: milling, surfacing, ultrasonic flaw detection, drilling, and re-tapping; this maintenance method requires about 350 hours of work per vehicle, and the average maintenance cost of the trolley is 4,500 yuan, the labor intensity is high, and the strength of the material after surfacing is about 80% of the strength of the original base metal, the strength of the tie rod seat will be reduced, and there are serious quality risks during the operation of the locomotive

Method used

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  • Method for restoring threaded hole of locomotive axle box pull rod seat
  • Method for restoring threaded hole of locomotive axle box pull rod seat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The specific steps of a method for repairing threaded holes of a locomotive axle box tie rod seat are:

[0026] Step 1. Fixing the positioning datum: place the frame flat on the processing platform, use four jacks to support the side beams of the frame frame, and adjust the leveling frame up and down through the jacks. Establish the workpiece coordinate system, take one point on each of the four first-series spring seats of the frame, establish a plane at the four points as the reference plane, and fix and repair the threaded hole position of the axle box tie rod seat on one side through the position of the axle box tie rod hole on the other side of the frame;

[0027] Step 2. Reaming the threaded hole of the axle box tie rod seat: Use a Φ24.5 twist drill bit to drill the threaded bottom hole on the threaded hole workpiece of the axle box tie rod seat to ensure that the drilled threaded bottom hole is Ф24.43 And relative position size, depth 98 mm;

[0028] Step 3. ...

Embodiment 2

[0034] The specific steps of a method for repairing threaded holes of a locomotive axle box tie rod seat are:

[0035] Step 1. Fixing the positioning datum: Place the frame flat on the processing platform, use four jacks to support the side beams of the frame frame, and adjust the leveling frame up and down through the jacks. Establish the workpiece coordinate system, take one point on each of the four first-series spring seats of the frame, establish a plane at the four points as the reference plane, and fix and repair the threaded hole position of the axle box tie rod seat on one side through the position of the axle box tie rod hole on the other side of the frame;

[0036] Step 2. Reaming the threaded hole of the axle box tie rod seat: Use a Φ24.5 twist drill bit to drill the threaded bottom hole on the threaded hole workpiece of the axle box tie rod seat to ensure that the drilled threaded bottom hole is Ф24.43 And relative position size, depth 98 mm;

[0037] Step 3. ...

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Abstract

The invention discloses a method for restoring a threaded hole of a locomotive axle box pull rod seat. The method comprises the steps that 1, locating basis fixing is carried out; 2, the threaded hole of the axle box pull rod seat is reamed, wherein a phi24.5 auger bit is used for drilling a threaded bottom hole in an axle box pull rod seat threaded hole workpiece, phi24.43o<+0.375> of the drilled threaded bottom hole and the relative position dimension are guaranteed, and the depth is 98o<+1> mm; 3, a guide thread of the threaded hole of the axle box pull rod seat is tapped; 4, hand tapping is carried out; 5, tapping residues are removed; 6, a steel wire screw sleeve is mounted; and 7, inspection is carried out through a go gauge and a non-go gauge. According to the method for restoring the threaded hole of the locomotive axle box pull rod seat, more labor and time can be saved during maintenance of the locomotive framework axle box pull rod seat, labor intensity is effectively lowered, and maintenance cost is reduced; and the maintenance process is simplified, the technical difficulty coefficient of maintenance is reduced, and the maintenance quality of the locomotive framework axle box pull rod seat can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of repairing threaded holes of tie rod seats of locomotive axle boxes, and in particular relates to a method for repairing threaded holes of tie rod seats of locomotive axle boxes. Background technique [0002] Since 2006, high-power AC drive electric locomotives were born and put into use in batches, marking that my country's railway locomotive industry has successfully realized the transformation from DC drive to AC drive. High-power electric locomotives have the characteristics of superior traction performance, high power, high adhesion utilization, good start-up acceleration performance, high reliability, and good energy saving and emission reduction. Electric locomotives are high-speed and heavy-duty locomotives. Since they have been put into use in batches to the present, a large number of them need to be inspected for two years; The overhaul must ensure high precision and high quality. [0003] The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00
CPCB23P6/00
Inventor 杨永燕袁善民王新航
Owner CRRC LUOYANG CO LTD
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