(II) Analysis of processing technology of hydraulic cylinder
The hydraulic cylinder is a typical long sleeve part, which is quite different from the processing method of the short sleeve part and the mounting method of the workpiece.
1. Technical condition and process analysis of hydraulic cylinder
The hydraulic cylinders are generally made of cast iron and seamless steel. Figure 7-68 shows a hydraulic cylinder with seamless steel tube material. In order to ensure the smooth movement of the piston in the hydraulic cylinder, there is a cylindricity requirement for the inner hole of the hydraulic cylinder, and there is a straightness requirement for the inner bore axis. There is a perpendicularity requirement between the inner bore axis and the end faces, and the inner bore axis supports the both ends. The axis of the circle (Φ82h6) has coaxiality requirements. In addition, special requirements are required: the inner hole must be smooth and free of longitudinal engraving; if it is cast iron material, it is required to be tightly organized, without blisters, pinholes and looseness.
2. Hydraulic cylinder processing technology
Table 7-3 shows the processing process of the hydraulic cylinder
Table 7-3 Hydraulic cylinder processing process
Serial number | Process name | Process content | Positioning and clamping |
1 | Ingredients | Seamless steel pipe cut | |
2 | car | 1. Ф 82mm outer circle to Ф88mm and M88×1.5mm thread (for process) | One end of the three-jaw chuck, the other end of the top of the big head |
| 2. Car end face and chamfer | One end of the three-jaw chuck, with a center frame at 88mm | ||
| 3. Turn head car Ф 82mm outer circle to Ф 84mm | One end of the three-jaw chuck, the other end of the top of the big head | ||
| 4. The total length of the car end face and chamfer is 1686mm (the machining allowance is 1mm) | One end of the three-jaw chuck, with a center frame at 88mm | ||
3 | Deep hole push | 1. Semi-precision push hole to Ф68mm | One end is fixed in the fixture with M88×1.5mm thread and the other end is centered. |
| 2. Fine push the pupil to Ф69.85mm | |||
| 3. Fine hinge (floating boring) to ±70±0.02mm, surface roughness Ra is 2.5μm | |||
4 | Rolling hole | Roll the hole with the rolling head to Ф70  Mm, surface roughness value Ra is 0.32 μm | One end is threaded in the fixture and the other end is centered |
5 | car | 1. Car to process thread, rut 82h6 to size, cut R7 slot | One end of the soft claw clip, the other end of the top is positioned by the hole |
2.镗Inner cone hole 1°30′ and car end face | One end of the soft claw clip, the other end of the center bracket (the dial gauge is used to find the hole) | ||
3. U-turn, rut 82h6 to size, cut R7 slot | One end of the soft claw clip, the other end of the top | ||
4.镗Inner cone hole 1°30′ and car end face | One end of the soft claw clip, the other end of the top |
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