Analysis of common failures of milling machines and how to eliminate them

What are the common faults of milling machines? How to exclude? Generally speaking, its common faults are as follows, as follows: Fault 1: The machined surface is not flat on the tool. Solution: Check the parallelism of the worktable, the parallelism of the main axis relative to the worktable, and the verticality of the lifting table relative to the worktable. Fault 2: The operating handle of the main shaft gearbox automatically falls off. Solution: Replace the spring or add a gasket. Fault 3: The operating handle of the main shaft gearbox cannot be operated. Solution: the vertical shaft handle and the hole are stuck, remove and repair; the sector gear and the clip are stuck, adjust the gap to about 0.15mm; the fork shaft is bent and deformed, and straighten; the rack shaft deviates from the hole cover Hole, change the speed of other levels, move the speed change plate, adjust the positioner spring. In addition to the above failures, there is another major failure of the milling machine that cannot be ignored, that is, abnormal machining accuracy. This failure is highly concealed and difficult to diagnose. So how should we solve it? According to experts, there are five main reasons for this failure: first, the feed unit of the milling machine is changed or changed; second, the zero offset of each axis of the milling machine is abnormal; third, the axial backlash is abnormal ; Fourth, the motor operating state is abnormal, that is, the electrical and control parts are abnormal; fifth, the mechanical failure, such as the lead screw, bearing, shaft coupling and other parts are faulty. In addition to the above five aspects, the preparation of processing programs, tool selection or human factors, etc., can also cause abnormal milling machine processing accuracy. Let's analyze some of them below. (1) What does the system parameter change or change the system parameter refer to? The system parameters mainly include milling machine feed unit, zero offset and backlash. Certain treatments in the repair process of the milling machine will affect the zero offset and backlash, so after the treatment, appropriate adjustments or modifications should be made. In addition, severe equipment wear or loose connections may also change the actual measured values u200bu200bof the parameters, so the parameters must be modified accordingly. (2) There are several possible causes for mechanical failures, including abnormalities in the motor, gaps in the lead screw, and mechanical failures, so check them out one by one. (3) The electrical parameters of the milling machine are not optimized, and the motor is running abnormally. There are two reasons: the screw backlash is large and the X-axis motor is working abnormally. The solution is to compensate for the existing gap, adjust the servo gain parameters and pulse suppression function parameters, and eliminate the jitter of the X-axis motor. Unless specified, the article is the original of Tiecheng Machinery CNC Milling Machine, welcome to reprint! Please indicate the address of this article for reprinting, thank you. Article source: http://www.wxdtc.com/