Error Analysis and Quality Improvement Strategies in Mechanical Processing

01machiningerror analysis

Errors in machining, the overall process performance has a far-reaching impact, in order to enhance the production efficiency and quality of mechanical products, we have to break through the limitations of machining process technology to effectively reduce but also to control these errors, however, China's current level of technology still need to work hard in machining errors is undoubtedly hindering the further development of its core problems, in the assembly line type of modern mechanical processing mode In the assembly line mode of modern machining, the completion of a part needs to be polished through a variety of process technology, through a number of production links hammering. Only by selecting the appropriate processing technology and machine tool equipment, can we ensure that the parts strictly meet the production standards and quality requirements. Only a thorough understanding and skilful use of machining technology can effectively reduce machining errors, so as to produce excellent quality mechanical products.

Causes and solutions of positioning errors

In the machining period, error control is quite important, among them, positioning error is one of the key elements affecting the machining accuracy, positioning error can be triggered by inaccurate machining of mechanical positioning sub-processing or inaccurate positioning of datums, so the selection of datums and positioning datums to maintain consistency is the key to reducing the error, in order to ensure that the machining of the high-quality completion, we must be guided by the precise elements of the machining, and endeavour to make the selection of datums and positioning datums highly consistent, and thus minimize the positioning error. In order to ensure the completion of high quality machining, we must be guided by accurate machining elements, and try to make the selection of datums and positioning datums highly consistent with each other to minimise positioning errors.

In machining, positioning error often exists, it is usually due to the mechanical positioning sub-processing is not accurate, or datum positioning is inaccurate and produced. This kind of error will directly affect the machining accuracy, so it can not be ignored. To ensure high quality machining, we have to be guided by precise machining elements, and try to make the selected datum and positioning datum highly compatible, so as to minimise positioning errors. In machining, positioning accuracy is the key to quality. In order to achieve accurate positioning and reduce errors, we have to deal with the problem between the fixture positioning elements and the workpiece positioning surface. At the same time, care should be taken to prevent quality impacts caused by errors in the measurement data of the original or errors in the positioning of the equipment.

Although the positioning adjustment method has the potential to cause sub-problems in positioning, which can have an impact on datum positioning, we can effectively prevent such datum errors from occurring with the help of the test-cut method.

Sources and Effects of Machine Tool Manufacturing Errors

In machining, the manufacturing error of the machine tool is a factor that can not be ignored, this error may come from the machining accuracy of the various components of the machine tool is not enough, or assembly process deviation, machine tool manufacturing error mainly from the parts of the machining accuracy and assembly deviation, the specific presentations for the spindle error, guide error, transmission chain error, will have an impact on the quality of the processing, once the machine tool has a manufacturing error, it will affect the positioning accuracy, and thus lead to fluctuations in the quality of the processed products. Positioning accuracy will be affected, resulting in fluctuations in the quality of processed products.

Manufacturing errors are a common problem in machine tool operation and are mainly caused by friction during machine operation. This is mainly due to spindle running errors, guideway errors and drive chain errors. First of all, the spindle running error usually comes from the spindle running speed and running volume of the unstable condition, which will cause wear and tear of the equipment, resulting in the actual running data deviation from the design data, which in turn triggered the error of machining products. Secondly, the guideway as the foundation of the positioning of machine components, its error may be due to improper installation or wear and tear in the use of the process. Finally, in machining, the drive chain plays a key role in energy transfer. If the transmission chain at both ends of the motor operation is not consistent, it will lead to chain and motor loss, and then let the two ends of the transmission chain to form a difference, and ultimately on the precision of machining products have an impact.

Geometric errors and their effects

Specifically, in the tedious process of machining machine parts, there is a condition known as geometric error, the main source of which encompasses inaccuracies in the geometry, dimensions, and relative position of the various components of the machine tool - yes, inaccuracies. Geometric errors, on the other hand, arise from inaccuracies in the shape and dimensions of machine components, which are caused by tool wear and the imprecise use of fixtures. It is worth noting that geometric errors have a direct impact on the shape, size and positional relationship of the machined product, which further reduces the machining accuracy of the product, a situation that should not be ignored.

To minimise the impact of geometric errors, the geometric parameters of machine components are measured and adjusted to ensure accuracy and consistency. Tools and fixtures are indispensable tools in machining, but they have the potential to introduce errors. If the contour of the tool is only partially met and does not fit all the way, this can lead to geometric errors that can have a serious impact on the accuracy of the product. Tools will wear out over the course of their use, so replacing them in a timely manner, depending on their level of wear and life expectancy, is the key to minimising geometric errors. In addition, improper use of fixtures can also lead to geometric errors. In the machining time, be sure to follow the operating procedures, the correct use of fixtures, to ensure that the machining position of the part is accurate, and thus lay the foundation for improving machining accuracy.

Generation and control of deformation errors

When processing, mechanical application, geometric error, there is a kind of error, called deformation error, its deformation error, due to uneven force or improper heat treatment, monitoring the processing factors and adjustments, can effectively reduce the error, the error, due to the processing of the workpiece, by uneven force or heat, to the shape and size of the change in the difference.

In order to prevent the appearance of deformation errors, operators should pay close attention to various factors in the machining process, such as cutting force, clamping force and heat treatment conditions, and take corresponding measures to control. Through the reasonable adjustment of these factors, can effectively reduce the deformation error, and then improve the accuracy and quality of machining. In the manufacturing process of mechanical products, compared with fixtures and tools, the strength of the workpiece is often at a lower level. Therefore, the generation of systematic errors is often closely related to the performance of machining products.

Error causes and control principles

Errors are an unavoidable problem during machining, and they not only affect the precision and quality of the product but also have a profound effect on the performance of the entire mechanical system. Errors in the process system are mainly due to the lack of strength of the workpiece, problems with the accuracy of fixtures and tools, and the instability of the mechanical system itself. In particular, the lack of strength of the workpiece, given that it is prone to deformation in the machining process, and therefore often become a key factor in triggering the system error. Process system errors are caused by insufficient workpiece strength and inaccurate datums, and the positioning datums should be selected according to the design datums, so as to reduce human errors.

Mechanical parts to be processed, positioning errors belong to the most common problems, the error is mainly from two aspects, one for the benchmark coincides with the existence of inaccuracy, and the second is the positioning of the sub-processing of inaccurate, in the machining process, accurate positioning is a very critical link, will directly affect the quality of the parts processed as well as the entire process of the performance of the system, so we must ensure that the positioning reference Therefore, we must ensure that the accuracy of the positioning reference, and to attach great importance to the normality of its geometric elements, and at the same time, as far as possible to prevent the positioning reference and the design of the benchmark is inconsistent, so as to reduce the appearance of positioning errors.

During the machining of mechanical products, a series of guidelines must be followed to ensure the quality of machining. Firstly, in the datum setting stage, multi-surface machining datums should be used so that positioning errors can be effectively prevented at the beginning of machining. Secondly, the positioning datum and the design datum should maintain a high degree of consistency, so as to prevent the occurrence of machining accuracy degradation due to datum inconsistency. In addition, in the machining process, in addition to the continued adherence to these general principles, but also for the uniqueness of the parts to be machined to pay special attention. In view of the differences in the material of the parts, so there will be a difference in the stiffness of the performance, and therefore need to use different jigs and fixtures and tools to adapt to many of these changes. In this way, not only can significantly reduce the error during machining, but also can greatly improve the processing quality of parts.