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Today, the global rail transit industry is booming through constant exploration of new technologies, new materials, new processes, and new equipment. To ensure the quality and safety of rail construction and the normal operations of the transportation system, the measurement for rail transit parts is playing more and more important role.

Railway bogies are an essential part of the train. The bogies support the mass of the vehicle, use the wheels to guide it along the track and provide some degree of cushioning against the vibration and shock transmitted from the track during motion. Railway bogies easily wear, deform and cause inner stresses due to the wear of components and external forces after the train runs a certain kilometer. In addition to shot blasting and flaw detection, a dimensional inspection on the bogies is necessary to check wear deformation and remove inner stresses.

PMT’s 3D measurement technology has been widely used in metro projects for many companies such as Hebei JingChe Rail Transit Vehicle Equipment and CRRC Group as well as for many cities such as Guangzhou, Taiyuan and Chongqing. In this chapter we will focus on the measurement methods of rail transit parts.

Before the introduction of PMT portable measuring arm, customers often used manual measuring tools, such as caliper, tape measure and inside micrometer. These traditional methods require very high demand for specialized skills and can not help customers see GD&T results more distinctly. Other disadvantages include higher workload, long time consumption, limited data collection and manual errors. Therefore, the usage of ALPHA portable CMM in railway bogies size measurement plays a vital role for the production, assembly, and maintenance of rail locomotives.

PMT Arm & Metrolog X4

Whether it is in a laboratory with constant temperature and pressure or in the on-site assembly under changing environmental conditions, the PMT portable CMM can provide flexible and multi-angle solutions for the visible parts of the train such as bogies. In this way, the PMT portable measurement arm efficiently avoids manual errors in large, greatly improves the accuracy of measurement, and is more in line with the needs of modern rail transit testing.

Key Points of the Measurement:

Measure the parallelism, plane and surface of the four axle box parts of the bogie;
Measure the size of the axle box diagonal (mostly ≥ 4000mm);
?Analyze data for compliance with technical requirements and instruct the assembly jobs;
?Provide professional measurement report at any time.

Advantages:

Measurement range/configuration: 4.0m/6-axis;
Operating temp range: 5 – 45℃;
Inspect whenever, wherever, without moving the bogie;
Archived measurements for data traceability and analysis.

The measurement of rail parts is a vital link in the construction of the country’s transportation networks. It directly affects the quality and safety of the rail transit system. PMT provides comprehensive solutions for the measurement of rail components that can spot problems and safety issues in time. The PMT portable arm helps guarantee a smooth running of bogies and optimize the quality control system of locomotives, promoting a high-efficient development of production capacity structure.

FAQ

Manufacturing and Assembly

In manufacturing and assembly, precise measurement solutions ensure components meet design specifications. Tools like CMMs and portable measurement arms verify dimensions, alignment, and tolerances, ensuring quality control and efficiency during production and assembly processes.

Engineering Machinery Measurement Solutions

Engineering machinery measurement solutions include tools like CMMs, laser scanners, and portable measurement arms to assess critical machine components. These solutions ensure precise measurements of dimensions, alignment, and geometric tolerances, improving manufacturing accuracy and efficiency.

Measurement Data Analysis

Measurement data analysis involves processing collected data to evaluate dimensions, tolerances, and quality. Tools like CMM software provide visualizations, statistical analysis, and reports to identify deviations and improve production processes effectively.

How to Measure Key Dimensions of Structural Parts?

Critical dimensions like hole diameter, flatness and perpendicularity can be captured using CMMs or portable measurement arms. The PMT portable arm offers flexibility for on-site inspection with its features of high accuracy and ease of use, becoming an ideal tool when measuring large complex structural parts.

What are the significant advantages of PMT Arm？

PMT Portable Measurement Arm has shown significant advantages in the field of tooling inspection and adjustment. Its high-precision measurement capability and excellent stability ensure the accurate positioning and adjustment of tooling equipment, effectively enhancing production efficiency and product quality. Therefore, it has become an indispensable and efficient tool in such field.