The screw hole on the pin support and the screw hole on the middle carriage or the connecting plate wide mouth preform mold manufacturers should be tapped, not skewed. Basic requirements for mold processing (1) Because the positioning pin 1 or the connecting plate is to be fixed on the middle carriage, it is necessary to tap holes in the middle carriage. Then, according to the spherical radius R (the actual center distance between the two pin holes of the connecting rod) and the T value, find the longitudinal distance from point B to point A. It can also ensure that the connecting rod moves freely. The point where the arc is located is point B.
If you want to process the outer circular surface shown in (a), then The mold needs to be modified, and the mold installation is as shown. When adjusting, pay attention to eliminate the gaps between the moving parts of the lathe.
During machining, the turning tool position directly affects the machining accuracy. In addition, the stiffness of the connecting rod should also be guaranteed. With this adjustment method, the larger the measured T value, the higher the accuracy of determining point A. The diameter of the positioning pin can be increased, or the structure of the pin support can be designed as shown, so as to reduce the positioning pin extending beyond the pin support The length of the pin increases the purpose of the stiffness of the positioning pin. At this time, the distance T of the middle carriage horizontal movement is equal to the percentage The reading of the table is poor. r丨Structure of the pin support ⑵Ensure the precision of the fit between the connecting rod and the positioning pin.
3. If the center line of the two positioning pin holes on the connecting rod is parallel to the center line of the spindle rotation, When the tip of the turning tool is exactly on the center line of the spindle rotation, the surface of the machined part is a spherical surface. When the carriage moves laterally, due to the role of the connecting rod, the carriage also moves longitudinally, so that the turning tool will be fixed The positioning pin 2 on the bed is the center of the circle, and the center of the two positioning pin holes on the connecting rod is used as the radius for horizontal arc movement. At this time, the point where the arc is located is point A.
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