Processing technology and method application of th

2022-09-30
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Hardware mold processing technology and method application

the latest finite element technology of ftware the status and development of flexible packaging equipment in China the relationship between coating technology and improving tool performance wavelet detection of tool wear ear piece processing technology and tooling the development and Countermeasures of China's woodworking machinery industry hot gas machine power generation technology is worthy of large-scale promotion and application the development status and trend of product data management technology how to ensure the process capability index (CP value) of machine tools Selection and comparison of EDM and NC Milling Application of UG in normalizing high precision ball bearing die cutting of ferrule switching power supply introduction of optimal layout algorithm in digital design of stamping process research on milling technology of PCB NC milling machine analysis of drilling The common box design of tapping spindle flexdebrr makes the finishing unit more perfect analysis of part drawings -- review of part drawings reflection on the development status of mechanical equipment industry in Gansu Province the first super large gear measurement center in China has successfully developed the method application technology in Harbin, which will enable Langsheng to further expand its business according to the needs of the next few years The main goal of rough machining of mold is to pursue the material removal rate per unit time and prepare the geometric contour of the workpiece for semi finishing. In the cutting process, due to the change of the metal area of the cutting layer, the load borne by the tool changes, which makes the cutting process unstable, the tool wear speed uneven, and the machined surface quality decreases. At present, many CAM software can be developed through the following measures

the main goal of rough machining die is to pursue the material removal rate per unit time and prepare the geometric contour of the workpiece for semi finishing. In the cutting process, due to the change of the metal area of the cutting layer, the load borne by the tool changes, which makes the cutting process unstable, the tool wear speed uneven, and the machined surface quality decreases

many CAM software developed at present can keep the cutting conditions constant through the following measures, so as to obtain good machining quality. Constant cutting load. Constant cutting layer area and material removal rate are obtained through calculation, so that the cutting load and tool wear rate are balanced, so as to improve tool life and machining quality. Avoid suddenly changing the feed direction of the tool. Avoid embedding the tool into the workpiece. For example, when machining the mold cavity, the tool should not be inserted vertically into the workpiece, but the inclined cutting method should be adopted (the commonly used inclined angle is 20 ° ~ 30 °), and the spiral cutting method is best used to reduce the tool load; When machining the mold core, try to cut from the outside of the workpiece first and then cut into the workpiece horizontally. When cutting in and cutting out the workpiece, the inclined (or arc) cutting in and cutting out should be adopted as far as possible to avoid vertical cutting in and cutting out. Using climbing cutting can reduce cutting heat, reduce tool stress and work hardening, and improve machining quality. The main goal of semi finishing die is to make the workpiece contour shape flat and the surface finishing allowance uniform, which is particularly important for tool steel dies, because it will affect the change of tool cutting layer area and tool load during finishing, thus affecting the stability of cutting process and the quality of finishing surface. Rough machining is based on volumemodel, while finish machining is based on surfacemodel. The geometric description of parts in the previously developed cad/cam system is discontinuous. Because there is no intermediate information describing the machining model after rough machining and before finishing machining, the distribution of residual machining allowance and the maximum residual machining allowance of rough machined surface are unknown. Therefore, the semi finishing strategy should be optimized to ensure that the workpiece surface has uniform residual machining allowance after semi finishing

the optimization process includes: the calculation of the contour after rough machining, the calculation of the maximum remaining machining allowance, the determination of the maximum allowable machining allowance Partition the surface with the remaining machining allowance greater than the maximum allowable machining allowance (the concentric circle scribed line composite material industry of the lower pressure plate has also won a good performance in order to facilitate the placement of samples, such as grooves, corners and other areas where the transition radius is smaller than the rough machining tool radius), as well as the calculation of the tool center path during semi finishing. Most of the existing cad/cam software for mold high-speed machining have the function of residual machining allowance analysis, and can adopt a reasonable semi finishing strategy according to the size and distribution of residual machining allowance. For example, openmind's hyperMILL and HyperForm software provide methods such as pencil milling and restmilling to remove corners with large residual machining allowance after rough machining, so as to ensure uniform machining allowance in subsequent processes. The localmilling of pro/engineer software has similar functions. For example, the value of residual machining allowance in the local milling process is equal to that of rough machining. In this process, only a small diameter milling cutter is used to remove the corners not cut by rough machining, and then semi finish machining is carried out; If the residual machining allowance value of local milling process is taken as the residual machining allowance of semi finishing, this process can not only remove the corners not cut by rough machining, but also complete semi finishing

the latest development is that the external computer is directly connected with the NC machine tool through RS-232C serial port to directly transmit the NC program quickly and accurately, and the external computer can be connected with multiple NC machine tools with the same or different control systems for information sharing, and can manage the information in the production process in the NC section composed of multiple machine tools, so as to reduce production preparation, Especially the preparation time of NC program. With the maturity of cad/cam, integrated management software, and the increasing demand for flexible manufacturing systems, the use of CNC machine tools, from single machine use to computer integrated management, is the direction of the development of production and processing industry technology

it is based on the above problems existing in the machinery processing industry, the introduction of new technologies and concepts of cad/cam system, the continuous introduction of MIS system and ERP system, and further, the development of CIMS technology in China, the information integration at the bottom of the workshop is the top priority. To this end, we have designed and developed various products for workshop processing equipment integration as described below

the high-speed finishing strategy of finishing dies depends on the contact point between the tool and the workpiece, and the contact point between the tool and the workpiece changes with the change of the surface slope of the machining surface and the effective radius of the tool. For the machining of complex surfaces composed of multiple surfaces, continuous machining should be carried out in one process as far as possible, rather than machining each surface separately, so as to reduce the number of tool lifting and cutting. However, due to the change of surface slope during machining, if only the machining side feed (Stepover) is defined, the actual step length on the surfaces with different slopes may be uneven, thus affecting the machining quality. Pro/engineer solves the above problems by defining the side cutting amount and then defining the residual area height of the machined surface (scallopmachine); HyperMILL provides equidistantmachining, which can ensure a uniform amount of side cutting between the tool paths without being limited by the surface slope and curvature, and ensure that the tool always bears a uniform load in the cutting process

in general, the radius of curvature of the finish machined surface should be greater than 1.5 times the tool radius to avoid sudden changes in the feed direction. In the high-speed finish machining of the die, when cutting in and out the workpiece each time, the change of the feed direction should try to adopt arc or curve transfer, and avoid using straight line transfer, so as to maintain the stability of the cutting process. Optimization of feed speed at present, many CAM software have the function of optimization and adjustment of feed speed: in the process of semi finishing, when the area of cutting layer is large, reduce the feed speed, and when the area of cutting layer is small, increase the feed speed. The optimization and adjustment of feed speed can make the cutting process stable and improve the quality of machined surface. The area of the cutting layer is automatically calculated by CAM software, and the adjustment of the feed speed can be set by the user according to the machining requirements

conclusion

mold high-speed machining technology is the integration of many advanced machining technologies, which not only involves high-speed machining technology, but also includes high-speed machining machine tools, CNC systems, high-speed cutting tools and cad/cam technology

At present, mold high-speed machining technology has been widely used in mold manufacturing industry in developed countries, but its application scope and application level in China still need to be improved. Vigorously developing and popularizing mold high-speed machining technology is of great significance to promote the overall technical level and economic benefits of mold manufacturing industry in China

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