Numerical control fine-grinding quality control method of rail welding joint

A quality control method and technology of welding joints, applied in the direction of track, track laying, track maintenance, etc., can solve the problems of large flatness error, scrapped re-welding, poor precision, etc., to achieve good flatness, high pass rate, high efficiency effect

Inactive Publication Date: 2012-07-04
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The grinding of welded joints in the rail welding factory is divided into rough grinding and fine grinding, which can better complete the rail grinding work, but the fine grinding equipment is large in size and expensive, and cannot be used for on-site operations
[0004] In the grinding process of the existing on-site grinding equipment, the profiling wheel is used to move back and forth in the longitudinal direction of the rail to imitate grinding. The grinding actions such as the rotating motion of the imitation grinding guide frame driven by it are all manually operated and controlled by human experience and observation. The degree of automation is low, the labor intensity is high, the quality of i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0026] A specific embodiment of the present invention is: a method for controlling the quality of rail welded joints by numerical control fine grinding, comprising the following steps:

[0027] a. Determination of the relationship between temperature and flatness: Through the temperature / thermal deformation simulation test of the rail welding head, the relationship curve between the rail temperature and the variation of the rail flatness is obtained.

[0028] b. Flatness detection:

[0029] b. Flatness detection:

[0030] The programmable controller controls the profiling motor to deflect the fine grinding head to the driving surface, and controls the reciprocating motor to move the fine grinding head, the laser distance measuring sensor and the non-contact temperature detector fixed on it to one end of the grinding guide frame; Then control the fine grinding head to move from one end of the grinding guide frame to the other end, record the initial flatness, temperature and i...

Embodiment 2

[0039] This example is basically the same as Example 1, the difference is only:

[0040] In the profiling fine grinding of step d, the specific method of starting the programmable controller and controlling the feed movement of the grinding wheel according to the preset feed parameters of step c is as follows:

[0041] The spark sensor installed on the fine grinding head detects the amount of spark during grinding and sends it to the programmable controller after A / D conversion. Quantity relationship, calculate the corresponding amount of sparks and grinding time, control the forward and reverse of the feed motor and the reciprocating times of the reciprocating motor.

Embodiment 3

[0043] This example is basically the same as Example 1, the difference is only:

[0044] In the profiling fine grinding of step d, the specific method of starting the programmable controller and controlling the feed movement of the grinding wheel according to the preset feed parameters of step c is as follows:

[0045] The load sensor of the main motor installed in the motor control box detects the load of the main motor, and sends it to the programmable controller after A / D conversion. The relationship with the feed amount, calculate the corresponding load and grinding time, and control the forward and reverse rotation of the feed motor and the reciprocating times of the reciprocating motor.

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PUM

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Abstract

The invention relates to a numerical control fine-grinding quality control method of a rail welding joint; longitudinal temperature and flatness data of a welding joint region are obtained through on-line actual measurement, a flatness curve measured actually is converted into the flatness curve corrected by temperature and removing temperature effect according to the relation of temperature change and rail flatness variation, and the parameters such as grinding position, range, feed rate and the like can be calculated by the corrected flatness curve, the fine-grinding process can be automatically and flexibly controlled by a programmable logic controller according to the calculated fine-grinding parameters, and the corrected flatness curve of the rail joint after each fine-grinding is measured again, the fine-grinding parameters are reset to perform next round of fine-grinding, until the measured corrected flatness curve meets the standard requirements. The method can perform automatic whole-course fine-grinding to the rail welding joint ground coarsely, the fine-grinding process has high automation degree and low fine-grinding cost, the welding joint ground finely has smooth appearance and good flatness, and no depressed joint can be ground; the method is convenient for data traceability, analysis and responsibility.

Description

technical field [0001] The invention relates to a method for controlling the quality of on-site welded joints of rail transit seamless line rails by numerical control fine grinding. Background technique [0002] The rapid development of high-speed and heavy-duty seamless lines puts forward strict requirements on the quality of seamless lines. The rails are first welded in the rail welding factory to form long rails of 250-500 meters, and then transported to the site for long rail welding to form seamless lines. The straightness of rail welded joints is an important indicator of the appearance quality of seamless lines. The railway industry standard TB / T1632.1-2005 of the People's Republic of China "Rail Welding" also specifies the straightness index of the rail welded joints driving surface and guide surface. corresponding regulations. Grinding is one of the important means to ensure that the straightness of rail welded joints is stable and up to standard. Grinding is also...

Claims

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Application Information

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IPC IPC(8): E01B31/17
Inventor 周世恒戴虹黄正中黄建平刘拥军周丹麦
Owner SOUTHWEST JIAOTONG UNIV
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