A small spool is used in a large number of servo cylinders of a certain type of product. The structural dimensions are shown in Figure 1.
Figure 1 spool
Existing problem
When making four f2.5mm uniform small holes on the circumference of f8mm, the following difficulties are encountered: 1 Due to the small size of the parts, it is difficult to operate with the indexing head, and the valve core clamping is difficult to find. 2 One spool needs to draw two lines. Each line dividing head needs to be rotated 90°, and the handle needs to be shaken 10 times. When the number of spools is large, it takes time and effort. 3 In the process of making holes, it is easy to appear that the division error is too large, resulting in the phenomenon that the distance between the two holes is too small, and the distance between the other two holes is too large. 4 Because the spool has an M4 threaded hole in the axial direction, when the small hole and the threaded hole are about to open, the drill bit is easily caught and broken.
Due to the above problems, the valve core has a low hole making efficiency. Consider making special tooling to solve the hole making problem of the valve core and improve work efficiency.
2. Spool hole tooling
(1) Functional requirements for the valve core hole tooling For the structural characteristics of the valve core and several difficulties in the hole making, the requirements for the valve core hole tooling: 1 can realize the rapid indexing and positioning of the valve core. 2 spool clamping is reliable and convenient. 3 has a drill guiding effect. 4 The structure is simple, easy to use, and easy to manufacture.
(2) Valve core hole tooling structure According to the above requirements, the valve core hole tooling is designed, and the structure is shown in Figure 2.
Figure 2 1. Spool ejector pin 2. Base block 3. Drill sleeve 4. Spool 5. Indexing table 6. Indexing Screw
The positioning of the spool is to use the shoulder of the f10mm cylinder and the f8mm cylinder on the spool, relying on the f8mm hole on the base block and the f10mm hole on the indexing turntable. First place the valve core into the indexing turntable f10mm hole. The indexing positioning screw is tightened, and the indexing positioning screw also has the function of fastening the valve core, and then the indexing turntable is connected with the valve core into the f8mm hole of the basic block to complete the positioning of the valve core.
The spool positioning tool uses the f8mm cylindrical surface on the base block to position the spool and limit the four degrees of freedom of the spool. During the drilling process, the spool has a small axial force. For the convenience of the upper and lower spools, the clamping device is omitted, and the indexing dial and the base block are pinched by hand to realize the spool clamping.
The indexing of the spool is achieved by using four indexing slots at 90° angles on the base block and an indexing screw screwed onto the indexing turntable. First, the indexing positioning screw is placed in the first indexing groove, and the drill bit is guided by the drill sleeve to make the first f2.5mm small hole, and then the valve core is used to push the valve core to the indexing turntable, and then The indexing turntable is rotated 90° into the second indexing slot, the second hole is drilled, and the third and fourth holes are drilled in the same way. Finally, the valve core is connected with the indexing turntable, and the indexing screw is unscrewed. The lower spool is drilled. Pay attention to cleaning the chips during the drilling process, otherwise the chips will easily cause positioning errors.
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