With the gradual technological development of metal stamping mold manufacturing, the original traditional method of manufacturing automobile cover molds by relying on master models and drawing graphics has gradually turned from the CAD/CAM terminal to the digital description of the shape of the automobile cover into a processing track. The method is replaced. The use of telephone lines to remotely control the processing process has pushed the level of scientific manufacturing of metal stamping parts to a new level. Looking back, when processing steel molds used for punching automotive exterior parts, a detailed blueprint must be drawn and a master model manufactured according to the precise dimensions of the punched parts must be drawn. It can be said that the model is the master model for designing and making molds. When using the casting method to manufacture metal stamping parts, samples of wooden molds or auto parts must be prepared first.

    The model made according to a certain proportion is called "master model", which is often used as a master model in profiling processing, or as an auxiliary model for displaying the processing track of a milling machine. The master finger on the shaping milling machine moves along the contour shape of the master, and the milling cutter mills the mold material according to the movement of the master finger to imitate the required mold cavity. The current processing method has undergone a fundamental change. The CAD data provided by the customer generates the cutting path of the milling cutter, and automatically processes the stamping die of the automobile cover part and the cavity die for the plastic sheet compression molding. Although the two mating surfaces of the mold can be processed more accurately with this new technology than the previous processing methods, the mold must be tested and the sample measured. Usually the main cavity surface of the mold is correctly processed by CAD data, and then the wear prevention pad and other parts are matched with the main cavity surface. The characteristics of this new die casting technology can now be summarized into the following aspects.

    Second, it is inspected by a three-coordinate measuring machine

    The coordinate measuring machine used for inspection with the CAD/CAM system is also different from the movable coordinate measuring machine that was originally suitable for traditional tooling. All three coordinate measuring machines in use now have an automated measuring system. The positioning accuracy of this three-coordinate measuring machine at any point in the measurement space of 3250X2090X1370mm is 0.015mm. It can measure the mass of die or plastic mold parts to 40 tons. In order for the measuring machine to maintain its highest measurement accuracy, it should be placed in an independent machine room isolated from the external environment, and the room temperature should be kept at 20°C. In order to prevent vibration from adversely affecting the measurement, the measuring machine should be installed on a concrete base with a mass of 100 tons supported by an air cushion. In the processing of automatic lathe parts in Shenzhen, the coordinate measuring machine can not only be used as a tool for final inspection of mold quality, but also as a tool for testing the processing process. That is to say, halfway inspection is carried out after each process is processed in the processing process. For example, inspect the main cavity surface of the spring factory mold after processing.

    Especially before polishing, the machined surface should be inspected comprehensively in order to determine how to more accurately achieve the required geometry of the machined surface. When inspecting the mold, it is necessary to pass through the parts with denser flow lines. Each mold must be inspected twice. One time before the stamping processing, another time after the stamping processing. The theoretical calculation thickness is used to measure the alignment of the upper and lower model cavities in order to grasp the actual situation of the CAD design data accuracy.

    Third, no master model and master model are required

    Although the main model and master model are no longer used, the machining accuracy of automatic lathe parts has been improved. For example, when the machining tolerance is very strict and the main cavity surface needs to be polished manually after grinding, the effect of using CAD data to process is better than using the master model and the master model. The main difference is that the size control has been fundamentally improved. When processing the cavity mold for forming plastic parts by traditional methods, the processing tolerance will change with the temperature of each day.

    Although the Dongguan metal stamping parts molds used for plastic sheet compression molding have good processing accuracy, the hot pressing of plastic sheets does not have the same rebound as stamping metal sheets, so after the precise control of the processing by CAD data, it is generally not necessary to try mold. For this kind of automatic lathe mold, it is only necessary to pass regular customer verification, and generally no need to submit the parts. This is mainly because CAD data processing is used to inspect the processing results, and the cavity surface of the mold can also be mathematically analyzed, thus ensuring that the manufacturing process can be implemented in strict accordance with the original design data. It is precisely because the manual operation in the mold manufacturing process is eliminated, the precision of the compression spring mold and the competitiveness of the processing cycle are improved.

    For this reason, the application of CAD data for mold processing technology has been promoted in most metal stamping parts processing plants. Now the experience of many factories can confirm that after applying this technology, although the tool path time generated by CAM has increased by 14%, the time used for polishing has been reduced by 33%, and the total processing time has been reduced by 16.5%. The quality has increased by 12%. Now, a variety of CAD/CAM software can help engineers design molds and generate tool paths for CNC milling machines. The system can also display 3D color models on the screen for mold design and analysis. It can also provide finite element analysis for improving casting quality and thermal performance analysis of molds. In fact, any customer's database can be used for input directly, or input after conversion.

    Fourth, the characteristics of plastic sheet molding die

    The mold used for compression molding of plastic sheet is different from the mold of stamping metal sheet, it has no material rebound problem. Therefore, processing this kind of power pin sometimes does not need to adjust the fit of the mold, but focuses on the surface condition of the plastic part. That is, focus on the surface accuracy and shape accuracy of the used surface.

    Five, the management of the processing process

    The network using the above-mentioned system is usually composed of a small calculator and a personal calculator terminal. An effective management system (EffectiveManagementSystem-EMS) software can track and manage the machining process. Such as mastering the processing progress, parts circulation status, purchasing status of outsourcing parts, receiving status and processing quality. This management system also includes material list, planning and control, inventory management, standard castings, material history, total production schedule, required material plan, order and sales history, arrival quantity, operator history, control of the workshop Status, planning time, quality evaluation, standard processing route, required production capacity plan, labor cost, outsourcing plan and arrival status, purchase requisition, outsourcing part history and deliverable quantity, etc. Using this kind of tension spring software, you can choose the right time for outsourcing and save labor.

    Make all processing status information into inventory management, thus generating a complete list of materials. Then follow the processing route orderly processing. The system also provides daily data on the operating staff's processing hours and machine tool operating time, as well as the time when work is stopped for materials. This can not only reduce the time consumed by the machine tool, but also calculate the actual production cost, so as to achieve the purpose of reducing production costs.