The main reason is the use of wiper blades or blades. For end mills in turning and milling processing, large-scale planes or heavy-duty intermittent cutting can be performed. Step milling adopts an insert end mill. Integral end mills are used to process cylindrical parts, and deep and narrow grooves are precision milled. Using the scraper structure of the above-mentioned tool, the deep part of the part can be cut by two of the four cutting edges of the tool, thereby realizing high-efficiency and high-precision machining. But with this method, problems can arise when the tool approaches a step and both sides of a groove. At this time, after the eccentric tool is processed, many rounded corners will be left on the surface of the part. In order to remove these fillets, the tool must be machined again. At this time, tool deviation is no longer needed, and the tool moves along the Y axis to the center of the part for processing. However, this machining allowance is not allowed in certain processing steps (sometimes the use of metal is not allowed).
An unsatisfactory fact in the machining of the turning-milling compound machining center is the shape error of the machined parts. When the milling cutter mills around the part, the surface of the part will inevitably form some fan-shaped traces at a certain interval. This error cannot be completely eliminated, but it can be effectively controlled with a wiper blade. One wiper blade closely follows the other blades, so that the blade edge is slightly convex in the width direction, so that the blade edge just extends to the surface of the machined part, and a new cutting surface is processed, with a slight fan-shaped trace smooth.
Detection method for spindle bearing of turning-milling composite numerical control lathe
Angular contact ball bearings are generally used in the production of CNC lathe spindle bearings by turning and milling composite CNC machine manufacturers. Use a micrometer to measure the inner diameter, outer diameter and thickness of the bearing, and compare it with the national standard to see if it meets the requirements. The thickness difference between the inner and outer rings of the angular contact ball bearing is measured with a lever indicator, a magnetometer seat, 3 100mm long standard blocks, 1 marble slab, and 1 100mm×100mm×20mm parallel block.
Clean the flat plate, the six end faces of the three standard blocks, the bottom face of the magnetometer base, and the upper and lower parts of the parallel block. Distribute the standard block 120° on the flat plate, put the upper mouth of the angular contact ball bearing upward on the standard block, and suck the magnetometer base into the parallel block. Knock the lever micrometer head upward on the outer ring end of the lower port of the angular contact ball bearing, press the lever micrometer down about 0.04mm, read out the one-thousandth reading and record. Gently push the parallel block and the magnetometer seat to the end face of the inner ring of the lower mouth of the angular contact ball bearing, read and record the dial indicator readings, and calculate the difference X between the two sets of readings, that is: the end face with a larger reading is smaller than the end face with a smaller reading Low x. For example, the outer ring end face micrometer reads -0.014mm and the inner ring end face reads 0.014mm, indicating that the inner ring end face is 0.014mm lower than the outer ring end face.
On the contrary, the bearing placement remains unchanged. Press the lever type dial gauge down on the end surface of the outer ring of the upper mouth of the angular contact ball bearing, press the dial gauge down about 0.04mm, read the dial gauge reading and record. Then move to the end face of the inner ring to read the dial gauge reading and record it, and calculate the difference y between the two sets of readings, that is, the end face with the larger reading is higher than the end face with the smaller reading. For example, the reading of the dial indicator on the end face of the outer ring is 0.014mm, and the reading of the end face of the inner ring is 0.014mm, indicating that the inner surface of the upper mouth of the angular contact ball bearing is 0.014mm lower than the outer ring. The above process is used to measure 4 points symmetrically on the circumference. It is best to measure the same value. If the difference between the measured values of the four points is 0.01~0.02mm, it can be used. If the deviation is too large, the bearing fails.
The temperature control system uses the thermal resistance to measure the temperature of the measuring point, and uses a multi-channel digital instrument to display the temperature value of the spindle bearing. PLC realizes the functions of parameter setting, remote monitoring, data storage and alarm processing. In the actual programming process, there is no need to write a program to read and write PLC memory. After defining the I/O variable, the variable name can be directly used for system control, operation display, data recording and alarm.
The system sets the start button to start the control program, and sets the red and green two instigation lights to display the temperature. When the temperature of the four measuring points is within the required range, the green light is on, indicating that the spindle can work normally; when the temperature of one measuring point reaches the upper limit, even if the spindle speed does not meet the requirements, the red light will be on, and the bearing alarm will be displayed absolutely. On the display of the CNC system. The operator will immediately end the operation of the spindle and check the status of the corresponding position of the spindle bearing according to the corresponding alarm number to prevent damage to the spindle bearing.