The characteristics of the cam curve of the disc stitching machine are as described above. Since the current cam groove adopts the empirical design method and can only be given in the form of discrete points, it must be fitted to an appropriate curve to facilitate manufacturing. At present, most CAD/CAM softwares have a secondary spline curve fitting function, so the secondary spline curve is used in practical applications. In addition, the requirements for the curve are three high. First, the curve itself requires high. The curve design must be correct, smooth, and free from local dents; secondly, the groove width dimensional accuracy is required. Experiments show that when the groove width processing error is >0.025mm, the product noise db value will be greatly increased. Third, the cam groove surface roughness and hardness requirements are high, they have an absolute impact on product noise and service life. Requires roughness Ra1.6m, hardness HB220. In summary, due to the limitations and defects of cam design and manufacturing, coupled with the structural characteristics of the cam itself, a new design and processing method must be sought. In 2001, the author proposed the CAD and CAM technology-based cam numerical control processing ideas and solutions. The goal is to realize the integrated solution of cam optimization design and CNC machining manufacturing, and take this opportunity to completely solve the cam design and It is difficult to manufacture technology that is plaguing enterprises in the medium and long term. The program was implemented in early 2004. From the current implementation effect, not only the optimized design of the cam groove is achieved, but also the inherent quality of the product is improved. More importantly, the processing quality is stable and reliable, and the workpiece is clamped and processed in one time. The machine plus auxiliary time also improves the processing efficiency. The following is the specific content of the cam design and CNC machining implementation. Cam groove curve error and CNC machining process analysis Because the cam groove curve has discrete points) fitting curve) multiple transformations of the line, each transformation inevitably brings certain errors, that is, there are fitting error and linearization error . To reduce these errors, various measures can be taken, such as densification of discrete points, selection of appropriate fitting curve types, and setting of sufficiently high linearization accuracy in CAM programming. Practice has shown that the above-mentioned measures can greatly reduce the error, so as to better meet the accuracy requirements of the sewing machine for the cam curve. The process plan of the groove processing is selected. The cam groove of this example is only semi-finished and finished, and the two sets of cam grooves are sequentially processed by selecting an end mill of =12 mm and 8 mm. For the convenience of programming, whether it is rough finishing or internal and external curve processing, the method of radius compensation and subroutine calling is adopted; in addition, in order to realize the sequential processing requirements as shown, the subroutine loop is used to call the structure, such as by calling 3 cycles. Can process 13 three-column cams, then go to the 2nd row and 1st column position for the next cycle processing, and so on. The rough finishing is performed in this order. When loop processing is performed on three columns, the programmed origin position is directly determined by the subroutine, which increases the versatility of the program. Further, two workpiece coordinate systems G54 and G55 are set at the first and third positions, and the same processing scheme is adopted for the two groups. It can be seen that four subroutines need to be programmed for the roughing and finishing of the cam groove, as shown by b. (Finish)
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