Improving the accuracy of mold processing has always be […]
Improving the accuracy of mold processing has always been a headache for many companies. Today, I will bring you several effective methods to improve mold processing accuracy.
The methods to effectively improve the processing accuracy can be roughly summarized as the following six:
1. Reduce the original error
Improving the geometric accuracy of the machine tool used for parts processing, improving the accuracy of fixtures, measuring tools and tools themselves, and controlling the force of the process system, thermal deformation, tool wear, deformation caused by internal stress, and measurement errors are all directly reducing the original error. In order to improve the machining accuracy, it is necessary to analyze the original errors that produce the machining errors, and take different measures to solve the main original errors that cause the machining errors according to different situations. For the processing of precision parts, the geometric accuracy, stiffness and thermal deformation of the precision machine tools used should be improved as much as possible; for the processing of parts with formed surfaces, it is mainly how to reduce the shape error of the forming tool and the installation error of the tool.
This method is a basic method widely used in production. It is to try to eliminate or reduce these factors after identifying the main factors that produce machining errors.
2. Compensate the original error
The error compensation method is to artificially create a new error to offset the original error in the original process system. When the original error is negative, the man-made error is taken to be positive, otherwise, take the negative value and try to make the two equal; or use one original error to offset the other original error, and try to make the two equal , The direction is opposite, so as to reduce the processing error and improve the processing accuracy.
3. Transfer the original error
The error transfer method essentially transfers the geometric error, force deformation and thermal deformation of the process system. There are many examples of error transfer methods. For example, when the accuracy of the machine tool does not meet the requirements of parts processing, it is often not blindly to improve the accuracy of the machine tool, but to find ways from the technology or fixture to create conditions to transfer the geometric error of the machine tool to the aspect that does not affect the machining accuracy.
4. Share the original error equally
In mold processing, due to the existence of blank or previous process errors, machining errors in this process are often caused, or due to changes in the material properties of the workpiece, or changes in the process of the previous process (for example, after the blank is refined, the original cutting process Cancelled), causing a big change in the original error. To solve this problem, the method of grouping and adjusting the average error is adopted. The essence of this method is to divide the original error into n groups according to its size, and reduce the error range of each group to 1/n of the original, and then adjust the processing according to each group.
5. Homogenize the original error
For shafts and holes that require high matching accuracy, grinding processes are often used. The grind tool itself does not require high precision, but it can perform micro-cutting on the workpiece during relative movement with the workpiece, and the high points are gradually ground away (of course, the mold is also partly ground by the workpiece), so that the workpiece reaches a high level. Accuracy. This process of friction and wear between surfaces is the process of continuous error reduction, which is the error equalization method.
6. In-situ processing method
In mold processing and assembly, some accuracy problems involve the interrelationship between parts or components, which is quite complicated. If you blindly improve the accuracy of parts and components, sometimes it is not only difficult, or even impossible, if the in-situ machining method (also called It is possible to easily solve the seemingly difficult accuracy problem. The in-situ machining method is commonly used in the machining of mechanical parts as an effective measure to ensure the machining accuracy of the parts.