Mechanical processing and assembly requirements

　　 1. Each seal must be soaked in oil before assembling;

　　2. After the gear is assembled, the contact spots and backlash of the tooth surface should meet the requirements of GB10095 and GB11365;

　　 3. Assembling rolling bearings allows the use of oil heating for hot loading, and the temperature of the oil should not exceed 100°C;

　　4. The parts must be cleaned up and cleaned before assembling, and there must be no burrs, oxide scales, flashes, rust, oil stains, cutting, colorants and dust;

　　 5. Sealing packing or sealant is allowed when assembling hydraulic system, but it should be prevented from entering the system;

　　6. Fasteners with specified tightening torque requirements must use torque wrenches and be fixed in accordance with the specified tightening torque;

　　7. The parts and components entering the assembly, including purchased parts and outsourcing parts, must have the certificate of the inspection department before they can be assembled;

　　 8. The tooth surface that is released at the same time during spline assembly shall not be less than two-thirds, and the release shall not be less than 50% in the length and height direction of the key red;

　　9. The main matching dimensions of the parts and components, especially the over-matching dimensions and related accuracy should be reviewed before assembling;

10. The excess adhesive flowing out should be removed after bonding;

　　11. The parts are not allowed to bump, rust or scratch during the assembly process;

　　12. After the rolling bearing is assembled, it should be turned flexibly and smoothly by hand;

　　 13. When bolts, screws and nuts are fixed, it is strictly prohibited to knock and use inappropriate screwdrivers and wrenches, and the screw grooves, nuts, screws and bolt heads shall not be damaged after tightening;

　　14. When the same part is fixed with common screws and bolts, the screws and bolts need to be poorly, symmetrical, uniform, and gradually distributed;

　　 15. The bearing body of the spherical bearing should be in uniform contact with the bearing seat, and the contact should not be less than 70% when tested by the coloring method;

　　16. When assembling the taper pin, it should be checked with the aperture. The contact rate should not be less than 60% of the mating length, and it should be evenly distributed;

　　17. When fixing the bearing bush with a positioning pin, drill the reaming and distributing pins while ensuring that the socket face and end face are flush with the opening and closing face and end face of the relevant bearing hole, and there shall be no looseness after the pin is driven in.

　　 18. The flat key should be in uniform contact with the two sides of the groove on the shaft, and there should be no gap between the mating surfaces;

　　19. The joint surface of the gearbox and the cover should be in good contact;

　　 20. After the flat key or spline of sliding fit is assembled, the corresponding accessories should move freely, but uneven tightness is not allowed;

　　 21. The outer circle of the bearing and the semi-circular hole of the open bearing seat and bearing cover are not allowed to jam;

　　22. Alloy bearing bushings are not allowed to be used when the surface is yellow, and the nucleation is not allowed within the specified contact angle, and the nucleation area outside the contact angle shall not be greater than ten percent of the total non-basic area;

23. The outer circle of the bearing should be in good contact with the semicircular hole of the open bearing seat and the bearing cover. When checking with coloring, it should be symmetrical with the bearing seat at 120° to the center line, and with the bearing cover at 90° symmetrical to the center line. Even contact. When checking with race size within the above range, the 0.03mm feeler gauge shall not be inserted into one-third of the outer ring width;

　　 24. After assembly, the outer ring of the bearing should be in contact with the end face of the locating end bearing evenly;

　　 25. The joint surfaces of the upper and lower bearing bushes should be tightly fitted and cannot be checked with a 0.005mm feeler gauge;

　　 26. Strictly check before assembly and remove the sharp-angle burrs and foreign objects remaining during the processing of the parts to ensure that the seals will not be scratched when they are installed;

　　 27. The reference end face of the gear or turbine should fit the shaft shoulder, and it cannot be checked with a 0.05mm feeler gauge, and the perpendicularity requirements of the reference end face of the gear and the axis should be ensured;

We enumerate the general requirements for hardware CNC machining, cutting processing, casting processing, heat treatment, tolerances, forgings, piping, edges and corners, coating, welding and assembly technical requirements and implementation standards, which basically cover all CNC hardware Processing forms involved in the field of mechanical processing

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