Analyze the causes of workpiece instability in small CNC lathes
2019-05-29 Post time: 2019-05-29
加工工件的尺寸不稳定可能由多种原因造成，其表现形式也有差别。 The size instability of workpieces processed by small CNC lathes may be caused by a variety of reasons, and their expressions are also different. In the following, we analyze the causes and corresponding solutions for different phenomena.
1. The workpiece has accurate dimensions and poor surface finish. Causes of the problem: The tool tip is damaged and not sharp; the machine tool resonates and is not stable; the machine tool has a sting; the processing technology is not good. Solution: If the tool is not sharp after being worn or damaged, re-sharpen or select a better tool to re-set the tool; resonance or uneven placement of the machine tool, adjust the level, lay the foundation, and stabilize it; the cause of the mechanical hoe is drag The plate guide rail wears fiercely, and the screw balls wear or become loose. The machine tool should pay attention to maintenance. After work, the wire should be cleaned and lubricating oil should be added in time to reduce conflicts. Select a suitable coolant for the workpiece processing. In the case, try to choose a higher spindle speed.
2. The cause of the taper size of the workpiece: the level of the machine tool placement is not adjusted, one high and one low, and the placement is not stable; when turning the long axis, the dedication data is relatively hard, and the tool eats the knife deeper, forming a knife giving phenomenon; The tailstock thimble is not concentric with the main shaft. Solution: Use a spirit level to adjust the level of the machine tool, lay a thick foundation, fix the machine tool and improve its resistance; choose a reasonable process and appropriate cutting feed to prevent the tool from being forced to give up the tool; adjust the tailstock on a small CNC lathe.
厂家的机床工作台(或刀架)移动阻力过大，一般为镶条调整过紧、机床导轨表面润滑不良所致。 3. The movement resistance of the machine tool table (or tool post) of the CNC lathe custom manufacturer is too large, which is generally caused by too tight adjustment of the inserts and poor lubrication of the surface of the guide rail of the machine tool. This failure phenomenon generally manifests as irregular changes in part size within a few wires. The inspection can be carried out by observing the size and change of the position deviation of DGN800-804. Usually, the difference is large when the forward and reverse directions are stationary. This type of failure is simply a matter of readjusting the inserts and improving rail lubrication.
4. The rolling bearings are worn or improperly adjusted, resulting in excessive movement resistance. This failure phenomenon also usually manifests as irregular changes in size within a few filaments. The inspection can be performed by the position deviation of DGN800-804, the method is the same as above. This kind of trouble only needs to replace the worn bearing and adjust it carefully, and the trouble can be eliminated.