1. The parts are descaled.

2. There should be no defects such as scratches, scratches, etc. on the surface of the parts that are to be machined.

3. Remove burr flash.

4. After conditioning, HRC50 ~ 55.

5. Parts for high frequency quenching, 350 ~ 370 °C tempering, HRC40 ~ 45.

6. Carburizing depth 0.3mm.

7. Perform high temperature aging treatment.

8. Uninjected shape tolerances shall meet the requirements of GB1184-80.

9. The tolerance for the length of the uninjected part is ±0.5mm.

10. The casting tolerance zone is symmetrical to the basic size configuration of the blank casting.

11. No fillet radius R5.

12. The non-injected chamfers are 2×45°.

13. Inverted blunt acute angle.

14. Each seal must be saturated with oil before assembly.

15. Assembly Rolling bearings allow oil heating for hot charging. The temperature of the oil must not exceed 100°C.

20. After the gear is assembled, the contact spot and backlash of the tooth surface shall meet the requirements of GB10095 and GB11365.

21. Seal packings or sealants are permitted when assembling the hydraulic system but should be prevented from entering the system.

22. Access to the assembled parts and components (including purchased parts and external parts) must be qualified by the inspection department to be able to assemble.

23. The parts must be cleaned and cleaned before assembly. There must be no burrs, flashes, scales, rust, chips, oil, colorants, dust, etc.

24. Check the main fitting dimensions of the parts and components before the assembly, especially the size of the interference fit and related accuracy.

25. Parts are not allowed to scratch, scratch, scratch or rust during assembly.

26. When tightening screws, bolts, and nuts, it is forbidden to strike or use inappropriate screwdrivers and wrenches. After tightening, the screw groove, nuts and screws, and bolt head must not be damaged.

27. For fasteners that require tightening torque, a torque wrench must be used and tightened according to the specified tightening torque.

28. When the same part is fastened with multiple pieces of screws (bolts), each screw (bolt) needs to be crossed, symmetrically, gradually and evenly tightened.

29. The taper pin assembly should be painted with the hole should be checked, the contact rate should not be less than 60% of the length, and should be evenly distributed.

30. The flat key and the two sides of the keyway on the shaft should be in uniform contact, and there must be no clearance on the mating surface.

31. The number of tooth surfaces simultaneously contacted by the spline assembly is not less than 2/3, and the contact rate must not be lower than 50% in the length and height direction of the key teeth.

32. When the flat keys (or splines) of the sliding fit are assembled, the phase fittings move freely and there must be no looseness.

33. The excess adhesive should be removed after bonding.

34. The semi-circular hole in the outer ring of the bearing and the open bearing housing and bearing cover must not be stuck.

35. The bearing outer ring should be in good contact with the semi-circular holes of the open bearing housing and the bearing cover. When coloring is checked, it should be within 120° symmetrical to the centerline and 90° symmetrical to the centerline of the bearing housing. Evenly contact. When using a feeler gauge within the above range, a 0.03mm feeler must not be inserted into 1/3 of the outer ring width.

36. After the bearing outer ring is assembled, the end face of the bearing cap of the positioning end should be evenly contacted.

37. After the rolling bearing is installed, it should be flexible and stable.

38. The joint surface of the upper and lower bearing bushes should be closely attached and checked with a 0.05mm feeler gauge.

39. When using the positioning pin to fix the bearing, the hinge and distribution should be drilled under the condition that the opening surface and the end face of the bearing pad are flush with the opening surface and the end bearing of the relevant bearing hole. Do not loosen after the sales have been entered.

40. The bearing body of the spherical bearing and the bearing housing should be in uniform contact. Check with the painting method. The contact should not be less than 70%.

41. The surface of the alloy bearing lining is not allowed to use when it is yellow, and there must be no nucleation within the specified contact angle. The area of ​​the nucleus outside the contact angle should not be greater than 10% of the total area of ​​the non-contact area.

42. The reference end face of the gear (worm gear) and the shoulder (or the end face of the positioning sleeve) should be attached and checked with a 0.05 mm feeler gauge. And should ensure the perpendicularity of the reference end face of the gear and the axis.

43. The interface between the gear box and the cover should be in good contact.

44. Check and remove the sharp corners, burrs, and foreign materials left on the part before assembly. Ensure that the seal is not scratched when it is installed.

45. Cold septa, cracks, shrinkage holes and penetrating defects, and severe incomplete defects (such as undercast, mechanical damage, etc.) are not allowed on the surface of the casting.

46. ​​Castings should be cleaned and free from burrs and flashes. Non-processed risers should be flush with the casting surface.

47. Castings and markings on the non-machined surface of the casting shall be clearly legible, and the position and typeface shall conform to the drawing requirements.

48. The roughness of the non-machined surface of the casting, sand casting R, not more than 50μm.

49. Castings should be removed from the rising mouth, flying spurs and so on. Non-processed surface of the riser residue should be leveled and polished to achieve surface quality requirements.

50. The sand, core sand and cores on the castings should be removed.

51. The casting has a slanted portion and its dimensional tolerance band should be symmetrically arranged along the slanted surface.

52. The molding sand, core sand, core bone, more meat, and sticky sand on the casting should be smoothed and cleaned.

53. The wrong type, convex casting deviation, etc. should be corrected to achieve a smooth transition, a guarantee of appearance quality.

54. The wrinkles on the non-machined surface of the casting are less than 2mm deep and the spacing should be greater than 100mm.

55. Non-machined surfaces of castings of machine products are shot blasted or drummed to achieve Sa2 1/2 cleanliness.

56. Casting must be toughened.

57. The surface of the casting should be flat and the sprue, burr, and sticky sand should be removed.

58. Castings are not allowed to have casting defects that impair the use of cold septa, cracks, holes, etc.

59. All surfaces of the steel parts that need to be painted must have rust, scale, grease, dust, dirt, salt, and dirt removed before painting.

60. Before removing rust, first use organic solvents, lye, emulsifiers, steam, etc. to remove grease and dirt from the surfaces of steel parts.

61. The interval between the surface to be coated and the primer applied by shot peening or manual derusting shall not be more than 6 h.

62. The surfaces of the rivets that are in contact with each other must be coated with a 30 to 40 μm anti-rust paint before they are connected. Lap edges are sealed with paint, putty or adhesive. Due to processing or welding of damaged primer, repaint.

63. All tubes prior to assembly shall be free from flashes, burrs, and chamfers at the tube ends. Use compressed air or other methods to clear the debris and floating rust on the inside of the pipe.

64. Prior to assembly, all steel pipes (including prefabricated pipes) shall be degreased, pickled, neutralized, washed, and treated for rust prevention.

65. When assembling, tighten the parts of the clamps, brackets, flanges, and connectors that are fixed by threads to prevent loosening.

66. Pressure test shall be carried out on the welded parts of the prefabricated pipes.

67. When the pipe is replaced or transported, the pipe separation port must be sealed with tape or plastic pipe to prevent any debris from entering and tagging.

68. The defect must be thoroughly removed before repair welding. The groove face should be smooth and smooth, and no sharp corners should exist.

69. According to the defects of cast steel parts, the defects in the repair zone can be removed by shoveling, grinding, carbon arc gouging, gas cutting or mechanical processing.

70. Sticky sand, oil, water, rust and other dirt must be thoroughly cleaned within 20mm around the repair area and bevel.

71. During the entire welding process, the preheating zone temperature of cast steel must not be lower than 350°C.

72. Where possible, weld as much as possible in a horizontal position.

73. When welding, the welding rod should not make excessive lateral swings.

74. When the surface of steel castings is piled up and welded, the overlap between weld beads shall not be less than 1/3 of the width of the weld bead.

75. The nozzles and risers of each steel ingot shall be provided with enough cut-offs to ensure that the forgings have no shrinkage and severe deflection.

76. Forgings should be forged in a forging machine with sufficient capacity to ensure that the forgings are fully forged.

77. Forgings are not allowed to have visible cracks, folds, and other appearance defects affecting use. Local defects can be removed, but the cleaning depth must not exceed 75% of the machining allowance. Defects on the non-machined surface of the forging should be cleaned and transferred smoothly.

78. Forgings are not allowed to have white spots, internal cracks, and residual shrinkage holes.

81. Finished parts must not be directly placed on the ground when placed. Take necessary support and protective measures. No defects, such as bumps, scratches, etc., affecting performance, life, or appearance are allowed on the machined surface.

82. Rolling the finished surface, there must be no peeling after rolling.

83. The final process heat treated parts should have no scale on the surface. After finishing the mating surface, tooth surface should not have annealing

84. The surface of the processed thread does not allow defects such as black leather, bumps, loose hooks, and burrs.

85, blue, discoloration phenomenon

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