What are the technical requirements to be complied with in machining?

In mechanical processing, in terms of technology, what are the requirements that need to be complied with? Only by complying with these technical requirements can the machined finished products be more standardized and reasonable. The specific technical requirements are as follows: (1) Deoxidize the parts. (2) There should be no scratches, scratches and other defects that damage the surface of the part on the processed surface of the part. (3) The tolerance of the unmarked shape should meet the requirements of GB1184-80, and the allowable deviation of the unmarked length dimension is ±0.5mm. (4) The casting tolerance zone is symmetrical to the basic size configuration of the rough casting. (5) The assembling of rolling bearings is allowed to use oil heating for hot charging, and the oil temperature shall not exceed 100°C. (6) Sealing packing or sealant is allowed when assembling the hydraulic system, but it should be prevented from entering the system. (7) The parts and components entering the assembly must have the certificate of the inspection department before they can be assembled. (8) The parts must be cleaned and cleaned before assembling, and there must be no burrs, flashes, oxide skin, rust, chips, oil, colorants and dust. (9) The main matching dimensions of parts and components, especially the interference fit dimensions and related accuracy, should be reviewed before assembly. (10) Knocking, bumping, scratching and corrosion of parts are not allowed during the assembly process. (11) When tightening screws, bolts and nuts, it is strictly prohibited to strike or use inappropriate screwdrivers and wrenches. The screw grooves, nuts and screws, and bolt heads shall not be damaged after tightening. (12) Fasteners with specified tightening torque requirements must be tightened with a torque wrench and tightened according to the specified tightening torque. (13) After bonding, the excess adhesive that flows out should be removed. (14) The semicircular holes of the bearing outer ring and the open bearing seat and bearing cover are not allowed to jam; the bearing outer ring should be in good contact with the semicircular holes of the open bearing seat and bearing cover. The seat should be evenly in contact with the bearing cover in the range of 120° symmetrical to the centerline and 90° symmetrical to the centerline. When checking with a feeler gauge within the above range, the 0.03mm feeler gauge shall not be inserted into 1/3 of the outer ring width. (15) After assembly, the outer ring of the bearing and the end face of the positioning end bearing cover should contact evenly. (16) After the rolling bearing is installed, it should be flexible and stable to rotate by hand. (17) The joint surfaces of the upper and lower bearing bushes should be closely attached to each other, and they cannot be checked with a 0.05mm feeler gauge. (18) When fixing the bearing bush with locating pins, drill the reaming and distributing pins in the state that the opening and closing faces of the bushing surface and the end face and the relevant bearing hole and the end bread are flush. Do not loosen the pin after driving in. (19) Alloy bearing linings 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 10% of the total area of u200bu200bthe non-contact area. (20) The reference end face of the gear (worm gear) and the shaft shoulder (or the end face of the positioning sleeve) should fit together, and it cannot be checked with a 0.05mm feeler gauge. And should meet the requirements of perpendicularity between the reference end face of the gear and the axis. (21) Strictly check and remove the sharp corners, burrs and foreign objects remaining during parts processing before assembly. The seal is not scratched when it is installed. (22) No cold partition, cracks, shrinkage, penetrating defects and serious incomplete defects are allowed on the surface of the casting. (23) Castings should be cleaned up without burrs and flashes. The pouring risers on the non-processing indications should be cleaned flush with the surface of the castings. (24) The casting characters and marks on the non-machined surface of the casting should be clear and identifiable, and the position and font should meet the requirements of the drawing. (25) Castings should be clear of pouring risers, spurs, etc. The remaining amount of the pouring riser on the non-processed surface should be leveled and polished to meet the surface quality requirements. (26) The molding sand, core sand and core bones on the castings should be removed. (27) Castings have inclined parts, and the dimensional tolerance zone should be arranged symmetrically along the inclined plane. (28) The right and wrong type, boss casting deviation, etc. should be corrected to achieve a smooth transition and an appearance quality. (29) The non-machined surface of the machine product castings needs to be shot peened or roller treated to meet the requirements of the cleanliness Sa2 1/2 level. (30) The surface of the casting should be flat, and the gate, burr, sticky sand, etc. should be removed. (31) Castings are not allowed to have casting defects such as cold partitions, cracks, holes, etc. that are detrimental to use. (32) Before painting the surface of all steel parts that need to be painted, rust, oxide scale, grease, dust, soil, salt and dirt must be removed. Unless specified, the article is the original large-scale machining of Tiecheng Machinery, welcome to reprint! Please indicate the address of this article for reprinting, thank you. Article source: http://www.wxdtc.com/