The program determines a) the processing equipment uses the existing Z525 vertical drilling machine. b) The bolt body of the connecting rod body and the connecting rod cover are processed at the same time, and the matching parts are placed in pairs after processing. c) Positioning reference: Positioned with the processed small head hole, one side of the big end of the connecting rod and one end of the connecting rod. d) Use the upper and lower guide sleeves when expanding and reaming, and the clips can be linearly displaced at a fixed point. e) The connecting rod body and the connecting rod cover are clamped at one time to complete the drilling, expanding and reaming of the two bolt holes.
Tooling design After determining the process plan, tooling is another key to ensure the smooth progress of the process and the processing accuracy. After careful research, we designed and produced special fixtures and tools. The clamp adopts upper and lower guide sleeves, and the clamps are specifically mounted on the base slide table, and are pushed by the cylinders and used to limit the displacement to ensure accurate displacement, as shown in 2. Reaming tools and reaming tools are specifically designed according to process parameters and fixture construction, as shown. The coupling of the tool to the machine spindle remains slightly floating to ensure accurate guidance.
1. Limit screw 2. Fixture base 3. Limit block 4. Clip specific 5. Positioning pin 6. Open platen 7. Positioning shaft 8. Screw 9. Upper guide sleeve 10.11. Screw 12. Lower guide sleeve 13. Cylinder process Parameters and operating process parameters: drilling to á7.8mm spindle speed 660 rev / min, feed 0.2 mm / rev. Reaming to á8.1mm spindle speed 660 rev / min, manual feed. Hinge á8.2+0.0150mm spindle speed 1250 rev / min, manual feed.
Basic operation procedure a) Clean the fixture and the workpiece positioning position, respectively install the link body, the connecting rod cover and the opening pressure plate, adjust the screws 10 and 11 to position the workpiece, and rotate the compression nut to clamp the workpiece. b) Drilling with á7.8mm drill bit, after drilling a hole, pull the cylinder valve change switch to shift the clamp to the position of another bolt hole, drill another hole á7.8mm.c) change the reaming drill á8 .1mm and upper guide sleeve, respectively, according to the above operation, expand the two holes to á8.1mm.d) Similarly, change the reamer and the upper guide sleeve, and hinge. e) Process and add sufficient cutting fluid according to the specified process parameters.
The summary uses this common drilling, expanding, and reaming process of connecting rod bolt holes. The method is simpler and the cost is lower, and the requirements for the tool and the guiding system are only slightly higher. At present, our factory has produced more than 20,000 pieces of 462Q connecting rods. The processing of bolt holes is all based on this process and tooling. After measurement and mass production, it fully meets the requirements of product paper, saving the investment of equipment for the factory. It ensures that the production tasks are completed according to quality and quantity. This kind of process plan has been extended to the processing of the connecting rod bolt holes of other models of our factory, and the effect is very remarkable.
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