What causes errors in lathe processing
Friends in the lathe processing industry know that precision plays an extraordinary role in the lathe processing process, especially now that many precision parts require extremely high precision in lathe processing. However, in the lathe processing industry, there will be many errors. If such errors are not dealt with in time, it will obviously cause the lathe processing parts to fail to meet the standards. Today Wofu will analyze the causes of errors in various types of lathe processing for you, and help you quickly find the causes and solve the error problems.
1. Positioning error of lathe processing.
One is that the reference point does not overlap the deviation. The standard used to confirm a certain surface layer specification and specific location on the part drawing is called the design concept standard. The standard used in the process flow chart to confirm the specifications and specific positions of the processed surface layer of the process flow is called the process flow standard. When carrying out the finishing of steel parts on lathe processing, certain basic elements of geometric figures on the steel parts must be selected as the precise positioning datum during finishing. If the precise positioning datum used does not overlap with the design plan datum, it will cause the standard Does not overlap deviation.
The second is the inaccurate deviation of the precision positioning of the lathe processing. The components on the fixture are difficult to be produced with absolute accuracy according to the basic specifications, and their actual specifications (or specific positions) are allowed to vary within the dimensional tolerance range of the distinguished specifications. The precise positioning surface of the workpiece processed by the lathe and the precise positioning components of the tooling and fixture form a precise positioning pair. In view of the inaccurate production and manufacturing of the precise positioning pair and the mutual cooperation gap between the precise positioning pair, the steel parts have a large specific position change, which is called In order to accurately position the production and manufacture inaccurate and error-free deviations.
2, the geometric deviation of the lathe machining tool. All CNC tools will inevitably be worn out during the turning operation, which will result in changes in the specifications and appearance of steel parts. Reasonable use of tool materials and new wear-resistant tool materials, scientific and reasonable use of the main geometric parameters and cutting parameters of CNC tools, appropriate selection of coolant, etc., can greatly reduce the damage of CNC tools and specifications. When necessary, compensation equipment can also be used to compensate the wear of CNC tool specifications.
3. Spindle deviation of lathe processing. Spindle bearing rotation deviation refers to the amount of change in the actual rotation center line of the spindle bearing at a moment relative to its average rotation center line. The key reasons that cause the axial rotation deviation of the main shaft bearing are: the parallelism deviation of several journals of the main shaft bearing, the deviation of the rolling bearing itself, the deviation of the parallelism between the rolling bearing, and the winding of the main shaft. Appropriately improve the manufacturing precision of spindle bearings and housings processed by lathes, adopt high-precision rolling bearings, improve the precision of assembly process of spindle bearing parts processed by lathes, carry out a stable balance of high-speed spindle bearing parts, and carry out pre-roller bearings. Wait. Can improve the rotation precision of the CNC lathe spindle.
4. Adjustment deviation. In each process of lathe processing, the processing system must be adjusted in one way and another. Because the adjustment is not absolutely accurate, it causes an adjustment deviation. In the machining process operating system, the specific position accuracy of the workpiece and the CNC tool on the machine tool on the lathe is guaranteed by adjusting the machine tool, tool, fixture or workpiece. When the original accuracy of machine tools, tools, fixtures and workpiece blanks all meet the process requirements without considering dynamic factors, the influence of adjustment errors will play a decisive role in processing accuracy.
5. Transmission gear deviation. The transmission system deviation of the transmission gear processed by the lathe refers to the deviation of the relative movement between the first and last two-wheel transmission system components in the internal transmission gear. The deviation of the transmission system is the deviation caused by the manufacturing and assembly process deviation of each important link in the transmission gear, and the error caused by the wear during the application operation process.