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Explanation of the acceptance criteria for CNC lathes by CNC lathe manufacturers

2016-10-31View Original

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Different manufacturers of CNC lathes may have varying standards regarding the operation of these machines, but the most basic requirements for their proper use remain unchanged. Below we will discuss the basic standards set by various CNC lathe manufacturers: the voltage supply for the machine tools should be stable, and the temperature must not drop below 30 degrees Celsius. 1. Requirements for the operating environment of CNC lathes: To prevent the machines from being exposed to direct sunlight or radiation, they need to be kept away from sources of vibration, and the impact of humidity also needs to be taken into account. If it is not possible to ensure a distance from the vibration source, vibration isolation ditches must be installed. Do not let these external factors affect the reliability of the machine tool. 2. Requirements for the power supply of CNC lathes: Generally, CNC lathe manufacturers install their machines in manufacturing workshops, where the conditions are relatively poor, and the power grid voltage is also highly unstable. Therefore, CNC lathe manufacturers that are established under certain conditions should exercise strict control over the power supply voltage of CNC lathes. It must remain within the allowed range; otherwise, the operation of the machine tool will be affected to some extent. 3. Requirements for temperature conditions in the CNC lathe environment: the temperature should be below 30 degrees Fahrenheit. Excessively high temperatures reduce the lifespan of control system components and also accelerate the development of failures. Of course, CNC lathes are equipped with components such as temperature exhaust fans; these accessories help to keep temperature changes minimal or constant, thereby maintaining the temperature of electronic components, especially the central processing unit. 4. Use the machines in strict accordance with the instructions. Each CNC lathe manufacturer sets parameters that meet the highest standards, and these parameters have a direct impact on the machine’s service life and operational efficiency; therefore, it is essential to follow the instructions carefully. Do not change these parameters casually. Do not replace machine tool accessories casually; it is necessary to consider the compatibility of parameters across all relevant aspects, and consult professionals when needed to carry out the proper configuration. It is even more important to note that when using hydraulic chucks, hydraulic tailstocks, hydraulic tool holders, and hydraulic oil pumping cylinders, the pressure must be strictly kept within the permitted range; it must not be increased in any way. The acceptance of CNC lathes shall be carried out in accordance with the **Technical Requirements for the Manufacturing and Acceptance of CNC Horizontal Lathes** that have been issued. The key aspects include: 1. During unpacking inspection, each item contained in the box is checked one by one against the accompanying packing list and the list of items specified in the contract. And make an inspection record. The following items need to be checked: whether the packaging is intact, whether there are any obvious damages to the appearance of the machine tool, such as rust or paint peeling; whether there are technical documents and whether they are complete; the types, specifications, and quantities of accessories; the types, specifications, and quantities of spare parts; the types, specifications, and quantities of tools; the types, specifications, and quantities of cutting tools/blades; installation accessories; the types, specifications, and quantities of electrical components. 2. Startup test: After the machine tool has been installed and adjusted, the manufacturer should be notified to send someone to adjust it. The tests mainly include the following: 1) Various manual tests a. Manual operation test to verify the accuracy of manual operation. b. Pulse test c. Spindle gear shift test d. Overtravel test 2) Functional test a. Perform functional tests on the machine tool using buttons, switches, and manual operation. The flexibility of the test movements, their stability, and the reliability of their functionality. b. Select any spindle speed to conduct consecutive tests for spindle start-up, forward rotation, reverse rotation, and stop. Manipulate at least 7 times. c. Test for changing the high, medium, and low speeds of the spindle. The tolerance for the commanded and displayed values of rotational speed is ±5%. d. Select any feed rate, and conduct tests on both normal feed and rapid feed throughout the entire travel range of the XZ axis. The rapid stroke should be greater than 1/2 of the full stroke. The positive and negative sides, as well as continuous manipulation, must be carried out at least 7 times. e. Conduct tests on changing the feed rate at low, medium, and high levels throughout the full range of motion on the X and Z axes, as well as various clamping tests using the turret tool holder. f. Conduct sealing, lubrication, and cooling tests on the hydraulic, lubrication, and cooling systems to ensure no leaks occur. g. Conduct tests on the chuck for clamping, releasing, flexibility, and reliability. h. Tests for forward rotation, reverse rotation, stop, and speed change of the spindle. i. Conduct forward and reverse positioning tests on the turret tool holder. j. Conduct tests to change the feed rate to low, medium, and high levels using the feed mechanism for fast feeding. k. Reliability and operational flexibility of functions such as test feed coordinate overtravel, manual data input, position display, returning to the reference point, program number indication and retrieval, program pause, program deletion, address line interpolation, straight cutting mode, taper cutting cycle, thread cutting cycle, arc cutting cycle, tool position compensation, pitch compensation, clearance compensation, etc. 3) No-load running test: a. Test of the active driving mechanism, to be carried out at the highest speed for no less than 1 hour, with the temperature of the main shaft bearings not exceeding 70°C and the temperature rise not exceeding 40°C; b. Continuous no-load running test, with a running time of no less than 8 hours and each cycle lasting no more than 15 minutes. The machine stops at the end of each cycle, and the action of releasing a stuck workpiece is simulated; the stop time does not exceed one minute before operation resumes. 4) The load test user prepares the drawings and blanks of typical parts, programs and inputs the procedures under the guidance of the manufacturer’s debugging staff, and selects the cutting tools and cutting parameters. The load test can be carried out in three steps: rough turning, heavy cutting, and finish turning. Each step is further divided into single-cutting and cyclic-program cutting. After each cutting operation, the actual dimensions of the machined part are checked and compared with the specified values. The operating accuracy of the machine tool under load conditions is also evaluated, that is, the overall machining accuracy of the machine tool, as well as the indexing accuracy of the turret. 3. Upon completing the unpacking inspection of the machine tool, functional testing, no-load operation testing, and load testing, as well as producing qualified products, the acceptance and handover procedures can be carried out. If there are any issues, the manufacturer shall be responsible for resolving them.

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