Abstract: In the process of mold production, only by improving the processing accuracy of the mold can its overall performance be improved. This article mainly introduces the key points that need to be paid attention to in the process of mold processing. And the factors that cause its precision inaccuracy. Finally, a specific solution is proposed. The main purpose is to improve the technical level
Abstract: In the process of mold production, only by improving the processing accuracy of the mold can its overall performance be improved. This article mainly introduces the key points that need to be paid attention to in the process of mold processing. And the factors that cause its precision inaccuracy. Finally, a specific solution is proposed. The main purpose is to improve the technical level of technicians in the process of exploring the processing technology, select appropriate chemical processing tools, collect machine tool parameters, and provide reference for mold processing.
Keywords: mold processing; precision; control method
Controlling the accuracy of mold processing mainly refers to selecting a suitable production process during processing. Control the processing knife and select the appropriate processing machine tool to form an overall processing control process. Under normal circumstances, the processing tools commonly used are: control processing technology, control processing tools, control processing procedures, and ensure that the dimensional accuracy, form and position tolerance, internal stress and other technical parameters of the parts are controlled in the mold finishing stage, so as to promote the development of mold processing technology in the direction of refinement.
1. Key points of tool processing control
(I) Reasonable selection of mechanical mold processing technology
In order to control the processing accuracy of the mold, first of all, according to the actual needs of the mold, select the appropriate processing technology, select the appropriate technology from a variety of types, compare the advantages and disadvantages and similarities and differences of several technologies, and finally get a suitable solution. The widely used processing technologies now include turning processing technology, bench processing technology, stamping processing technology and other technical means. But each process has its own process characteristics. Therefore, the impact on the shaping and accuracy of the mold is also different. Therefore, it is necessary to optimize the process flow and improve the precision of the mold according to the needs of the work.
(II) Select mechanical mold processing equipment
In the process of mold processing, there are many types and quantities of processing equipment used, and the processing equipment used for each processing stage will also be different. For example, when the mold uses the forging method, in order to improve the accuracy of the mold, in the process of controlling the forging temperature, it is necessary to use furnace clamps. Because the clamp head of the clamp will fail under the influence of alternating hot and cold, the selection of suitable clamps will directly affect the accuracy of the mold. In the use of benchwork, files are used. How to choose the right file type according to the characteristics of the mold can improve the molding effect of the mold. Therefore, in order to ensure the improvement of mold accuracy, the processing equipment should be properly handled and the appropriate processing tools should be selected.
(III) Optimization of control means
During the mold processing process, the types of mechanical molds processed are also more diverse, including cylindrical molds, conical molds, and some irregular molds. Therefore, in the overall processing process. There are large differences in the processing materials used. In order to meet the diversity of tool types, the actual demand conditions in production should be fully considered, so as to achieve efficient work.
2. Mold accuracy control strategy
(I) Solve problems in processing accuracy and improve processing quality
During the mold processing process, the factors affecting mold accuracy mainly include the following aspects: manual errors in processing, problems in machine tool programming, machine tool mold defects, etc. There are many reasons for these accidents. The most frequent accidents are caused by problems caused by poor manual processing, which ultimately lead to a decrease in accuracy. This is mainly due to the fact that workers are not focused, operate in an irregular manner, and do not master the technology properly, which leads to the deviation of mold precision calculation and affects the mold precision. In addition, the problem of machine tool control programming is mainly due to the fact that the CNC machine tool programming program used is in an open loop and cannot give full play to its intelligent control function. In addition, factors such as inaccurate selection and insufficient precision of the mold itself during mold processing also restrict the precision of the mold processing technology.
(II) Specific strategies for enhancing mold processing technology
In order to improve the mold processing technology, the research direction needs to be focused on the following aspects: First, optimize the precision control method of mold processing to avoid some related problems caused by inadequate process design and operation specifications during the process of /Ⅱn-r. Second, select suitable auxiliary processing tools and control the entire processing process; third, optimize the CNC machine tools, control the processing strength of the mold, and ensure the precision of mold processing.
In addition, in order to better control its precision, it is necessary to pay attention to several small work details on the basis of combining the mold processing precision, and standardize the operation process on this basis: First, improve the mold processing technology and make it more professional according to the processing needs. At present, although some mold processing personnel have skilled operating skills, there are major problems in the precision of mold processing. Therefore, the professional skills of operators should be strengthened and business training should be carried out regularly. Strengthen the application of new technologies, new processes and new materials, focus on cultivating the overall technical level of mold processing personnel, develop detailed work habits, and reduce a series of problems that arise during the processing. Second, during mold processing, it is necessary to regularly check and maintain mold production equipment to avoid affecting mold processing accuracy due to unstable control during processing; third, it is necessary to adjust the CNC coding parameters in combination with the actual construction situation to ensure the rationality of construction.
III. Parts precision control measures
(I) Parts heat treatment
After heat treatment, parts need to be specially processed, so not only higher requirements are placed on the hardness of parts. At the same time, the internal stress of parts should also be controlled, which is the best way to ensure the stability of part processing dimensions. Therefore, it is necessary to select materials with stable material properties, small deformation and good hardenability, such as CrWMn, Crl2, 40Cr, Crl2MoV and other alloy tool steels. Quenching treatment is performed after rough processing. After quenching, the parts will still retain a relatively large stress. Since stress is a change caused by the external object being affected by the objective environment, it is mainly manifested as the internal force between the two forces within the object. Such internal force still needs to maintain the original state of the object, so it will use its own internal force to act on the parts. This original force is very strong, which will cause the finely processed parts to crack under the mutual balance of the two forces. Therefore, it is best to use the spheroidizing annealing process for the pre-heat treatment of the parts. In this way, grains with good stability and uniform material fraction can be obtained; in the quenching process, it is important to pay attention to tempering immediately after the heat has not subsided, which will help eliminate the stress of quenching and ensure the overall stability and precision of the parts. At the same time, it can ensure that the stress is controlled within a specific range to avoid the force of stress recovery to stretch the original shape, which affects the precision of mold processing.
(II) Parts grinding
Surface grinders, internal and external cylindrical grinders, centerless grinders, etc. are common machine tools for parts grinding. Commonly used grinding methods are: forming grinding wheel grinding method and fixture grinding method. Since grinding requires objects to collide with each other, heat is generated, which causes grinding deformation, which will cause different degrees of deformation or grinding cracks on the surface of the mold. Usually, this deformation cannot be observed by the naked eye, but such small errors will have a greater impact on subsequent special processing. Therefore, the friction frequency and feed rate of the grinding wheel should be controlled during fine grinding. And sufficient coolant should be prepared. In addition, suitable fine grinding tools should be selected according to different materials. When grinding flat plate parts, pads and equal height blocks can be used as the standard for grinding to maintain the parallelism of the workpiece. In addition, when grinding shaft parts, attention should be paid to the circular runout tolerance generated by the rotating part. To avoid this error, attention should be paid to the number of gate points, the overall layout form, and the position presentation method. Ensure that each key point image corresponds and is balanced, and ensure high temperature and low pressure during the casting process, so as to effectively improve the accuracy of mold processing.
IV. Conclusion
In order to effectively control the processing accuracy in actual work, it is necessary to combine the actual needs of the mold with the processing technology, consider factors such as professional skills, processing tools, and mold coding parameters, and summarize the mold processing method to further improve the processing accuracy.