There are two types of online inspection systems for CNC lathes:
One is to directly call the basic macro program without computer assistance;
The other is to develop a macro program library by itself, with the help of a computer-aided programming system, generate a detection program at any time, and then transfer it to the CNC system.
The steps of the detection path when the CNC lathe measures the typical geometric shape are:
- 1. Determine the geometric elements of the part to be measured;
- 2. Determine the accuracy characteristics of the parts to be tested;
- 3. Determine the number and distribution of detection points according to the measured geometric features and precision features of the shape features;
- 4. Establish mathematical calculation formulas based on the number of measurement points and distribution form;
- 5. Determine the workpiece coordinate system of the detected part;
- 6. Determine the detection path according to the detection conditions.
Five online inspection systems for CNC lathes:
1. Lathe body
Numerical control lathe body is the basis for processing and testing. Its working parts are the parts that realize the basic motion required. The accuracy of its transmission components directly affects the accuracy of processing and testing.
2. CNC system
At present, CNC lathes generally use CNC numerical control systems, the main features of which are input storage, CNC machining, interpolation calculations, and various control functions of machine tools are all realized by programs. The computer and other devices can be connected through an interface device. When the control object or function changes, only the software and interface need to be changed. The CNC system is generally composed of a central processing memory and input and output interfaces, and the central processor is composed of a memory, an arithmetic unit, a controller, and a bus.
3. Measuring system
The measuring system consists of a touch trigger probe, a signal transmission system and a data acquisition system. It is a key part of the online inspection system of CNC lathes and directly affects the accuracy of online inspection. The key component is the probe, which can be used to measure the size during the machining process. The machining program can be automatically modified according to the measurement results to improve the machining accuracy, so that the CNC lathe is both a processing device and a function of the measuring machine.
Renishaw probes are used in most CNC lathes such as CNC lathes, machining centers, CNC grinders, and special machines. Probes can be divided into workpiece detection probes and tool probes according to function; according to the signal transmission method, they can be divided into hard-wired, inductive, optical, and radio; according to the contact form, they can be divided into contact measurement and non-contact measurement. The user can select the appropriate configuration according to the specific model of the machine tool.
4. Servo system
Servo system is an important part of CNC lathe. It is used to realize the servo control of feed position and spindle speed (or position) of CNC lathe. The performance of the servo system is the main factor that determines the machining accuracy, measurement accuracy, surface quality and production efficiency of the machine tool.
5. Computer system
On-line inspection system uses the computer to collect and process measurement data, generate CNC program for inspection, simulate the inspection process and communicate with CNC lathes. The online inspection system takes into account the currently popular software such as Windows and CAD / CAM / CAPP / CAM and VC, as well as reducing the analysis and calculation time of the measurement results, and generally uses a computer above the Pentium level.
