(4) Over-travel test Each axis performs over-travel test in both positive and negative directions. There are two types of machine tool over-travel protection, one is software storage limit protection, and the other is hardware protection. The overtravel status is represented by the control unit alarm and the display on the screen, and the hydraulic station power is cut off. If overtravel protection does not work, it will cause damage to mechanical parts.
3. Functional test (1) Functional test The function test of the machine tool is carried out by means of buttons, switches and manual manipulation. Test the flexibility, smoothness and reliability of the action.
(2) Optional one type of spindle speed for continuous start of spindle start, forward rotation, reverse rotation, stop (including braking), continuous operation not less than seven times.
(3) Spindle high, medium and low speed conversion test. The command value of the rotational speed and the display value tolerance are ± 5%.
(4) Optional feed rate, continuous operation of start, feed and stop operations, continuous work feed and rapid feed test on all strokes of X and Z axes. The fast stroke should be greater than 1/2 full stroke, and the continuous operation should be no less than seven times in the positive and negative directions.
(5) Perform low, medium and high feed change tests on the full stroke of the X and Z axes.
(6) The turret tool holder is indexed in the forward and reverse directions and various index clamping tests.
(7) The hydraulic, lubrication and cooling systems are tested for sealing, lubrication and cooling performance so as not to leak.
(8) The chuck is tested for clamping, loosening, flexibility and reliability.
(9) The spindle performs forward rotation, reverse rotation, stop and change spindle speed test.
(10) The feed mechanism performs the transformation test of low, medium and high feed rates and rapid feed.
(11) Perform functional test of the machine tool with digital control commands, flexibility of test operation and reliability of function.
(12) Test feed coordinate overtravel, manual data input, position display, reference point, program number display and retrieval, program pause, program deletion, linear interpolation, linear cutting cycle, taper cutting cycle, thread cutting cycle, circle Reliability, motion flexibility, etc. of arc cutting cycle, tool position compensation, pitch compensation, and clearance compensation.
4. Dry running test (1) Main motion mechanism running test Tests the temperature change and no-load power of the spindle running time in the non-cutting state. The main motion machine of the machine tool is driven by the low, medium and high speeds. The step-variable speed is not less than 2 minutes for all speeds. The maximum speed is not less than 1 hour, so that the spindle bearings reach a stable temperature. Check that the temperature of the spindle bearings does not exceed 70 °C.
(2) Continuous air run test All functions of the NC program command are used to perform (without cutting) continuous motion and swing test. Its exercise time is no more than 15 minutes. At the end of each cycle, the parking is stopped, and the Songka work is simulated. The parking is not more than one minute, and the operation is continuously operated for 48h to 72h according to different requirements of the customer.
5. Trial cutting After the geometrical precision and motion precision of the machine tool meet the requirements, the workpiece should be processed according to the corresponding standard and the self-standard to detect the machining performance after the numerical control transformation of the machine tool. In addition to the necessary finishing, it is necessary to carry out a certain load test to check the stability of its accuracy.
After the above tests meet the requirements, the joint adjustment work after the numerical control transformation of the machine tool is completed.
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A pipette, also known as a pipette gun, is a device used to quantitatively transfer liquids. When conducting research in analytical testing, a small or trace amount of liquid is generally removed with a pipette. Pipettes can be divided into gas piston pipettes (Air-displacement pipette) and external piston pipettes (Positive-displacement pipette) according to the principle. Gas piston pipettes are mainly used for standard pipetting, and external piston pipettes are mainly used to handle special liquids such as volatile, corrosive and viscous. Many people ignore the correct use of pipettes and some of the details.
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