1 Introduction
The axle is the main key component of the vehicle, and its quality accuracy level directly determines the vehicle's performance and carrying capacity. With the vigorous development of urban roads and highways in China, people are increasingly demanding the carrying capacity of large passenger cars and trucks, and their performance requirements are getting better and better. China FAW Liberation Co., Ltd. Axle Branch Company (hereinafter referred to as a car bridge) is one of the professional manufacturers of large passenger cars and truck axles. There is a technical difficulty in the processing of the axle that has not been well resolved for a long time. That is, the accuracy of the geometric position of the main pin hole and the lock pin hole of the axle. In the past two years, an automobile bridge adopted the OMS-10 CNC machine tool online measurement system (hereinafter referred to as the OMS-10 online measurement system) to change the traditional processing technology, fundamentally avoiding the deficiencies in the traditional processing technology and completely solving the problem. This problem in production.
2 Structural features of OMS-10 online measurement system
OMS series online measurement system is a product produced by Harbin Pioneer Electrical and Mechanical Technology Development Co., Ltd. (hereinafter referred to as Harbin Pioneer). It is installed on CNC machine tools. After measuring positioning parts, it can directly feed back to CNC machine tools with accurate machining data. The problem of high reject rate caused by fixture failure is reduced, the machining accuracy of the workpiece is improved, and the machining speed of the machine tool is increased. OMS series online measurement system is divided into many types of products such as OMS-10 and OMS-50. OMS-10 online measurement system is specially used in machining centers, numerical control boring mills, milling machines and other numerical control equipment; OMS-50 online measurement system is specially used for CNC lathes, turning centers and other numerical control equipment. The main features of the OMS-10 online measurement system are introduced.
2.1 Composition of OMS-10 Online Measurement System
Fig. 1 Composition of OMS-10 online measurement system
The system mainly consists of two parts: hardware and software (see Figure 1). Hardware: TP6C infrared communication trigger probe, SRA infrared signal receiver, SCA system controller, connecting cable, mounting bracket and tool kit; Software part: standard measurement software package SPA or enhanced measurement software package SPA+.
2.2 Functions and Features of OMS-10 Online Measurement System
(1) Mechanical functions of the TP6C probe: Three-dimensional movement of the stylus probe, high-precision reset, replaceable stylus, taper shank can be replaced, the position of the stylus on the stylus can be accurately adjusted, the main protection class is IP67, and the electronic function is The selected sleep mode, instantaneous low-speed rotation start, a variety of infrared coded signals (contact, trigger, low-voltage alarm), a variety of light indication signals, built-in charging power supply, ultra-low power technology.
(2) The function of SRA infrared signal receiver: a variety of signals (contact, trigger, low-pressure alarm) receiving and anti-jamming function, multi-channel signal receiving, a variety of sound, light indicating signal, mounting frame can be universally adjusted.
(3) Functions of the SCA system controller: output switch signal of two kinds of work logics of SSR, one set of system can use two SRA infrared signal receivers, the system has multiple signal indications, and can intelligently charge the probe head, quickly Connected interface panel for installation in a variety of mounting positions.
(4) The function of the software system: a variety of automatic calibration mode of the probe, touch probe trigger protection function, measurement of inner and outer circles, measurement of grooves and bosses, measurement of single plane, measurement of inner and outer corners, The fourth axis measurement, XY plane angle measurement, three-point measurement circle, hole center distance measurement, etc.
The main features of this system are its wide application range, complete automation of workpiece measurement, and ease of use by machine tool operators.
3 Application of OMS-10 Online Measurement System in Axle Machining Process
In the machining process of large passenger cars and truck axles, the position accuracy of the main pin hole and the lock pin hole is a difficult problem to guarantee. First, the main pin hole and the lock pin hole are two holes on the same part of the space (see Figure 2) and require a relatively high position accuracy, can not be completed on a conventional CNC machine tool to complete a clamping process; Second, the parts The size is relatively large and the shape is relatively complex; therefore, it is difficult to ensure the spatial position accuracy between the main pin hole and the lock pin hole when positioning is performed using a conventional processing tool.
Figure 2 Locking pin hole and the main pin hole spatial position relationship
A car bridge has adopted different production processes in the production of large-scale axles for more than 20 years. Whether it is machining the pin hole after machining the main pin hole, or machining the pin hole after machining the pin hole, it is very difficult to be better. To ensure the position accuracy between the two holes and processing efficiency problems. The traditional processing technology is to insert the positioning pin into the lock pin hole, relying on the long-selling cylindrical surface and the V-shaped surface of the V-shaped seat to match the positioning (see Figure 3) to control the distance between the lock pin hole and the main pin hole. The length is 28 ±0.2mm position accuracy. During the machining process, the operator needs to clean the iron chips, sludge and the like between the mating surfaces in time before the workpiece is replaced. The fixture of the machine tool is prone to failure, and the fixture is periodically checked and corrected. This leads to long processing times for individual parts, reduces production efficiency, and increases production costs.
Fig. 3 Schematic diagram of traditional processing
In order to solve the above problems, a car bridge engineering personnel has fully verified and boldly reformed, changed the traditional processing technology, installed OMS-10 online measurement system in the processing center, using the TP6C probe with right angle measurement before processing the main pin hole. The pin actually measures the center coordinate of the pin hole (see Figure 4). The center position of the pin hole is automatically calculated based on the central coordinate value of the pin hole, so as to ensure the spatial position accuracy between the pin hole and the pin hole. . Thanks to the OMS-10 online measurement system, operators do not need to use other auxiliary methods to save a large amount of auxiliary operation time and shorten the processing time, thereby improving the efficiency of the machine tool, improving the production efficiency, and effectively reducing the production cost. . OMS-10 online measurement system is now installed on several car machining centers of a car bridge, which realizes the transition from rigid to flexible machine tools. The size and size of the machined workpieces are not limited, and large and small batches can be produced in an ideal scale.
An automobile bridge's comment on Havant was that before the “right-angle measurement”, the workshop was to rely on the long-selling hole inserted into the pin hole and the V-shaped position on the V-shaped seat of the machine fixture to control the pin hole and the main pin hole. The length dimension is 28±0.2mm. When the workpiece is actually machined, the positioning is not reliable (the fixture often fails, the workpiece is not strict, and sometimes the iron chips, etc.). Through the unremitting efforts of China Pioneer - Harbin Pioneer, the company's positioning is not resolved. Quasi-processing problems.
Fig. 4 Schematic of machining process
4 Conclusion
In the highly competitive manufacturing industry, the use of CNC machine tools has become more and more widely used. How to improve the efficiency of machine tools, reduce the production costs of manufacturers, and increase the competitiveness of enterprises are the most important issues. The use of the OMS series of online measuring systems on CNC machine tools can fundamentally solve this problem. Installing the OMS series of online measurement systems is an effective means of improving quality control methods.
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