JP2004130874A - Dimension measuring method for bogie frame for railroad - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dimension measuring method for a bogie frame for railroad as a large-sized structural member to measure a molded work for each bogie frame, whereupon the acceptability is judged through comparison with a design model on a personal computer and the marking-off for the mounting reference point to a machine for mechanical processing is conducted. <P>SOLUTION: The attached illustration shows a measuring model S<SB>1</SB>obtained by plotting on the personal computer the result from measuring the bogie frame three-dimensionally and the design model M<SB>1</SB>of the bogie frame for the railroad. A conversion into a fit model is made by executing the processing to approach the measuring model S<SB>1</SB>to the design model M<SB>1</SB>, and a comparison of the shape accuracy is made in such a way as laying it on the design model, and thereupon a judgement of the acceptability is passed. Marking-off for the mounting reference point to the machine for mechanical processing is conducted for each molded work judged as acceptable. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for measuring dimensions of a bogie frame for a railway.
[0002]
[Prior art]
The rail bogie frame is formed by joining a member or a pipe member obtained by pressing a steel plate by welding means to form a substantially H-shaped frame body, and machining the necessary portions to produce a product.
[0003]
[Problems to be solved by the invention]
Prior to this machining, it is necessary to place the rail bogie frame material on a surface plate and perform a marking operation for designating a processing location.
[0004]
However, the bogie frame material for railways is a large-sized structure, and since the members are assembled by welding, distortion and the like of the members are likely to occur, and even if the marking work is performed, whether there is a machining allowance or not, It is a material that is difficult to check the cutting size etc.
[0005]
Therefore, the present invention measures a railway bogie frame forming material with a measuring device, and superimposes the measurement results on a 3D model of the railway bogie frame to achieve optimization. Then, by replacing the result with a CAD model of a railway bogie frame forming material, comparing with a CAD model of a processed shape of a product, and automatically checking a cutting allowance, the above-described conventional problem is solved. It is.
[0006]
[Means for Solving the Problems]
The process of measuring the molding material of the railway bogie frame from the three-dimensional direction, the process of plotting the measurement results to create a measurement model of the molding material, and processing the measurement model to best approximate the design model of the railway bogie frame The process of converting the fit model to the fit model, the process of comparing the shape accuracy of the fit model and the design model, and the process of marking the mounting reference point of the molding material on the machine in accordance with the satisfaction of the shape accuracy It is provided.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a perspective view showing a shape of a railway bogie frame forming material for implementing the present invention.
[0008]
The molding material indicated by reference numeral 1 has a structure in which two members 10 and 20 arranged in parallel are connected by two pipe-shaped portions 30 and 40.
[0009]
Machined parts 12 and 14 to be machined are provided at both ends of the first member 10. Machined parts 22 and 24 to be machined are also provided at both ends of the second member 20. The railway bogie frame molding material is further provided with a machined part.
[0010]
FIG. 2 is a perspective view showing an outline of a measuring device used in the measuring method of the present invention.
[0011]
The measuring device indicated by the reference numeral 100 in its entirety has a fixed table 110 on which the railway bogie frame molding material 1 is placed. Outside the fixed table 110, a pair of opposed gate-shaped frames 120 and 130 are erected, and a traveling rail 140 guided by the portal-shaped frame is attached. A saddle 150 is mounted on the traveling rail 140 so as to be able to travel, and a measuring head 160 is attached to the saddle 150 so as to be able to move up and down.
[0012]
The measuring head 160 is controlled to be movable three-dimensionally along the axes X, Y, and Z. The measuring head 160 detects the coordinate position of each point of the molding material with or without contact with the railway bogie frame molding material 1 to be measured.
[0013]
Figure 3 is a graph showing the measurement model S ₁ a plot of the measurement results measured by the three-dimensional measuring apparatus 100 in broken lines. Model M ₁ drawn with solid lines in FIG. 3 is a CAD model showing the design shape of the railway bogie frame.
[0014]
The measurement model S ₁ is displayed naturally deviated from the design model M _1.
[0015]
The cause of the deviation is that the accuracy error of the molding material itself, which is the basis of the measurement model, and the error due to the posture when the material is placed on the fixed table 110 are combined.
[0016]
Therefore, as shown in FIG. 4, data processing such as the least squares method is performed so that the measurement model S ₁ comes closest to the design model M ₁ , and a fit model F ₁ called a best fit or a best match (dotted line) Shown).
[0017]
Figure 5 shows a state in which superimposed the fit model F ₁ in the design model M _1. Machining unit _12M 1 on design model _{M 1, 14M 1, 22M 1} , 24M 1 is a portion hatched respectively. If all of these machined parts are included in the corresponding machined parts 12F ₁ , 14F ₁ , 22F ₁ , 24F ₁ on the fit model F ₁ , the shaving allowance is secured in the machined part of the molding material. It will be.
[0018]
Inspection items include that the shape accuracy of members other than the machined portion is within a predetermined error dimension difference.
[0019]
If these inspection items are satisfied, the railway bogie frame molding material is determined to be a passed product.
[0020]
Then, using a pointing device such as a laser pointer, a required marking such as a reference point for setting the machined portion of the molding material on the processing machine is performed.
[0021]
When the machining allowance of the machined portion is insufficient or the shape error of the member does not satisfy the predetermined value, the molding material is returned to the previous process, and necessary correction and rework are performed.
[0022]
FIG. 6 is a flowchart of the process of the present invention.
[0023]
The process started in step S10 sets the rail bogie frame molding material on the table of the measuring device in step S11. In step S12, the coordinate position of each point of the molding material is measured, and in step S13, these measurement points are plotted to create a measurement model. In step S14, the measurement model is processed by the least square method or the like so as to overlap the design model most, and is converted into a fit model.
[0024]
In step S15, the shapes of the fit model and the design model are compared.
[0025]
In step S16, it is checked whether or not the shape accuracy is within a predetermined error. If not satisfied, the process proceeds to step S18, where the molding material is corrected, reworked, and the like, and the process returns to step S11.
[0026]
If the measurement result is satisfied in step S16, the process proceeds to step S17, where necessary instructions such as a reference point for attachment to the machining machine are marked on the molding material by a laser pointer or the like, and the process ends in step S20. Then, it moves to a post-process such as machining.
[0027]
【The invention's effect】
As described above, the present invention three-dimensionally measures a molding material of a railway bogie frame formed by assembling a large member by press working and welding, processes a measurement model obtained from the measurement result, and processes the railway bogie frame. Create a fitted model that best approximates the design model of. Then, the shape accuracy of the formed model is determined by comparing the shape accuracy of the fit model with the shape accuracy of the design model. From the creation of the measurement model, the quality judgment is executed on the personal computer.
[0028]
Thereafter, the reference point for attaching the machining machine to the molding material is injured, so that the productivity of machining, which is post-processing, is improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a railway bogie frame to which the present invention is applied.
FIG. 2 is a perspective view showing measurement of a railcar frame forming material.
FIG. 3 is a plan view of a measurement model of a molding material.
FIG. 4 is an explanatory diagram for converting a measurement model into a fit model.
FIG. 5 is an explanatory diagram for comparing a fit model and a design model.
FIG. 6 is a flowchart of a process according to the present invention.
[Explanation of symbols]
1 railway vehicle frame 10 first member 12, 14 machined portion 20 and the second members 22, 24 machined portion _{S 1} measurement model _{F 1} fit model _{M 1} design model

Claims (1)

The process of measuring the molding material of the railway bogie frame from the three-dimensional direction, the process of plotting the measurement results to create a measurement model of the molding material, and processing the measurement model to best approximate the design model of the railway bogie frame The process of converting the fit model to the fit model, the process of comparing the shape accuracy of the fit model and the design model, and the process of marking the molding material mounting reference point on the molding material in accordance with the satisfaction of the shape accuracy A method of measuring the dimensions of the bogie frame for railways.

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