One part of the 6110A diesel engine - the rear suspension bracket, see Figure 1, the blank is a casting. The shape of the part is relatively special. When the fixture is designed, the positioning reference and the clamping device are difficult to determine, and the loading and unloading is inconvenient. The original fixture design is shown in Figure 2. The positioning point takes an example of the side of the rib and the size of 54 ± 0.5 mm. The clamping force presses the workpiece by tightening the P_1 force of the bolt 7 and the P_2 force acting on the workpiece by the tightening bolt 3, the hook-shaped pressure plate 5, and the pressure plate 6. From the perspective of the fixture structure, the drill template is in the [type-suspended shape, so the workpiece is unstable during operation. From the calculation of drilling force and clamping force, it is concluded that the fixture is time-consuming and labor-intensive, and the labor intensity of the worker is too great. For this we changed the fixture shown in Figure 2.
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