Cross-hole machining has always been a problem in milling and drilling. Due to the appearance of the intersecting holes, the drill bit is prone to bending or knifeing when machining the second hole. A new product part of our factory is a 25 mm × 25 mm × 20 mm square. There are two sides on the side with a side length of 25 mm × 20 mm. ? 12 mm cross-through hole. The structure is shown in Figure 1.
figure 1
We usually consider drilling or milling for the processing of holes, which is convenient and quick to process. But the difficulty here is the processing of the two crossed holes, especially the second hole. Under the premise that there is a through hole, the second hole is reworked, and the knife needs to have good rigidity to be positioned. Otherwise, the second hole may be deflected, and the tool may be broken more seriously. In addition, the center line of the two holes To maintain the same plane, there is also a requirement for verticality, which is difficult to achieve on a drilling and milling machine. After several rounds of discussion, it was finally determined that the machine was machined, the workpiece was rotated and the tool was not moved, thus ensuring the rigidity of the tool and designing a special tooling, thereby solving the above problems better.
After discussion, the final decision was made on the C616 lathe, and the design tooling is shown in Figures 2 and 3.
Figure 2 Tooling assembly drawing 1. Platen tightening bolt 2. Pin 3. Platen 4. Workpiece 5. Positioning plate 6. Tooling 7. Coupling bolt 8. Compression bolt
The tool presses the workpiece by the pressure plate 3 and the pressing bolt 8 to position the two sides of the positioning plate 5, and clamps the working body 6 with a three-jaw self-centering chuck during processing, and places the workpiece in the middle of the positioning plate 5. Hole, tighten the two compression bolts 1 and 8. When machining the first hole, pay attention to the fact that after the workpiece is hooked with the wire, the two 25 mm × 25 mm faces of the workpiece must not be interchanged when the workpiece is clamped again, because the workpiece positioning surface is the first 25 mm × 25 mm. Face, if the face-to-face is different due to different machining standards, the cross-holes of the two machines are processed differently.
Figure 3 3D illustration of tooling
Summary: This artifact seems simple, but through the conversion of thinking, the cross-hole machining problem is solved by drilling and milling into machining. Therefore, in machining, we need to change our thinking and consider a variety of processing methods to determine the best solution to the problem.
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