流水线,组装流水线,自动线同一零件用多个螺钉或螺栓紧固时，各螺钉 （螺栓） 需顺时针、 交错、 对称逐步拧紧，
Assembly line, assembly line, automatic line installation process: screw, bolt connection
When tightening screws, bolts and nuts, it is strictly forbidden to strike or use inappropriate screwdrivers and wrenches. After tightening, the screw grooves, nuts,
Screws and bolt heads must not be damaged.
Fasteners with specified tightening torque requirements for assembly lines, assembly lines, and automatic lines should be tightened with a torque wrench according to the specified tightening torque. For bolts whose tightening torque is not specified, the tightening torque can refer to the regulations in Appendix 1.
When multiple screws or bolts are used to fasten the same part of assembly line, assembly line, and automatic line, each screw (bolt) needs to be tightened clockwise, staggered, and symmetrically.
If the assembly line, assembly line, and automatic line have positioning pins, start with the screws or bolts close to the positioning pins.
When using double nuts, install the thin nut first and then the thick nut.
After the screws, bolts and nuts are tightened, the screws and bolts should generally expose 1-2 pitches of the nut.
After the screws, bolts and nuts are tightened, the supporting surface of the screws, bolts and nuts should be attached to the fastened parts.