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Research and analysis of on-line detection system based on CNC machine tool

Browse:608次    Release date: 2019-12-28

There are two kinds of on-line detection system for CNC machine tools: one is to call basic macro program directly without computer assistance; the other is to develop macro program library by ourselves, and generate detection program at any time with the help of computer-aided programming system, and then transmit it to CNC system.

The on-line detection system of CNC machine tool consists of software and hardware. The hardware part usually consists of the following parts:

(1) Machine tool body

The machine tool body is the basis of processing and testing, and its working parts are the basic moving parts needed to achieve. The accuracy of its transmission parts directly affects the accuracy of processing and testing.

(2) CNC system

At present, CNC machine tools generally use CNC system, its main characteristics are input storage, CNC processing, interpolation calculation and various control functions of machine tools are realized through programs. The computer and other devices can be connected through the interface equipment. When the control object or function changes, only the software and interface need to be changed. CNC system is generally composed of central processing memory and I / O interface, and central processing unit is composed of memory, arithmetic unit, controller and bus.

(3) Servo system

Servo system is an important part of CNC machine tools, which is used to realize servo control of feed position and spindle speed (or position). The performance of servo system is the main factor that determines the machining accuracy, measurement accuracy, surface quality and production efficiency of machine tools.

(4) Measurement system

The measurement system is composed of contact trigger probe, signal transmission system and data acquisition system. It is the key part of CNC machine online detection system, which directly affects the accuracy of online detection. The key component is the probe, which can be used to measure the dimension in the process of machining. According to the measurement results, the machining program can be automatically modified to improve the machining accuracy, so that the CNC machine is not only a processing equipment, but also a certain function of the measuring machine.

At present, the commonly used Renishaw probe is the product of Renishaw company in England. They are used in CNC lathe, machining center, CNC grinder, special machine and other CNC machine tools. According to the function, the probe can be divided into workpiece detection probe and tool probe; according to the signal transmission mode, it can be divided into hard wire connection type, induction type, optical type and radio type; according to the contact mode, it can be divided into contact measurement and non-contact measurement. Users can choose the appropriate configuration according to the specific model of the machine.

(5) Computer system

The on-line detection system uses the computer to collect and process the measurement data, generate the detection NC program, simulate the detection process and communicate with the NC machine tool. In order to run the popular software such as windows, CAD / CAM / CAPP / CAM and VC + +, and reduce the analysis and calculation time of measurement results, the computer above Pentium level is generally used in the online detection system.

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