How to analyze the position detection device of high-speed CNC machining center How to analyze the position detection device of high-speed CNC machining center? Due to the type, processing precision, working environment and control mode of high-speed CNC machining center, the position detection method required is different. The position detection devices are usually classified as follows:
1. For direct measurement and indirect measurement, the shape of the detection sensor is linear and rotary. If the measured index measured by the measuring sensor is the required index, that is, the linear sensor measures the linear displacement and the rotary sensor measures the angular displacement, the measuring method is the direct measurement. The direct measuring device of the ridge has a grating and an encoder.
If the angular displacement measured by the rotary sensor is only the intermediate amount, and then the corresponding linear displacement of the Ding station is calculated, the measurement method is indirect measurement, and the measurement accuracy depends on the accuracy of both the measuring device and the machine tool transmission chain. . Typical indirect measuring devices for machine tools include encoders and resolvers. Welcome to the company ***http://
2. Incremental measurement and absolute measurement can be divided into incremental measurement and absolute measurement according to the measurement device coding mode. Incremental measurement of high-speed CNC machining centers is characterized by measuring only the displacement increment, that is, every time the table moves by one basic length unit, the measuring device sends out a measurement signal, which is usually in the form of a pulse. Typical incremental measuring devices for machine tools are grating and incremental photoelectric encoders. Absolute measurement is characterized by the position of any point being measured is calculated by a fixed zero point, each measurement point has a corresponding measurement value, often expressed in data form. Typical absolute measuring devices are contact encoders and absolute photoelectric encoders.
3. Contact measurement and non-contact measurement, there is a mechanical connection between the measurement sensor of the contact measurement and the measured object, so the deformation and vibration of the high-speed CNC machining center itself will have certain influence on the measurement. Typical contact measuring devices are grating and contact encoders. Cnc CNC machining The measurement sensor for non-contact measurement is separated from the measurement object without mechanical contact. A typical non-contact measuring device has a dual-frequency laser interferometer.
4. Digital measurements and analog remake digital measurements represent the measured quantities in quantified digital form. The high-speed CNC machining center digital measurement features simple measurement device, strong signal interference, and easy display processing. Typical digital measuring devices include photoelectric encoders, contact encoders, and gratings. The analog measurement is that the measured quantity is expressed by continuous variables, such as voltage and phase changes. Typical analog measuring devices are rotary transformers and the like.
