(1) On the surface of parts processing, there should be no scratches, scratches and other defects that damage the surface of parts.
(2) Remove scale from parts.
(3) The unmarked shape service shall meet the requirements of gb1184-80, and the allowable error of unmarked length scale shall be ± 0.5mm.
(4) The casting service belt is symmetrical to the basic dimension equipment of the blank casting.
(5) For the installation of rolling bearings, it is allowed to use oil heating for hot installation, and the oil temperature shall not exceed 100 ℃.
(6) When installing the hydraulic system, it is allowed to use sealing filler or sealant, but it shall be prevented from entering the system.
(7) The parts and components entering the installation can be installed only after they have the qualification certificate of the inspection part.
(8) Before installation, it is necessary to tidy and clean the parts, and there shall be no burr, flash, oxide skin, rust, chip, oil stain, colorant and dust.
(9) Before installation, the primary cooperation scale of parts and components, especially the interference cooperation scale and relevant accuracy, shall be rechecked.
(10) Parts shall not be knocked, bumped, scratched or rusted during installation.
(11) When fastening screws, bolts and nuts, it is forbidden to impact or use inappropriate screwdrivers and wrenches. After fastening, the screw groove, nut, screw and bolt head shall not be damaged.
(12) For fasteners with regular tightening torque requirements, it is necessary to select torque wrench and tighten them according to the regular tightening torque.
(13) The residual adhesive flowing out shall be removed after bonding.
(14) The semicircular holes of the bearing outer ring, open bearing seat and bearing cover must not be stuck; The semicircular holes of the outer ring of the bearing, the open bearing seat and the bearing cover shall be well touched. When viewed by coloring, they shall be evenly touched within the range of 120 ° symmetrical to the center line with the bearing seat and 90 ° symmetrical to the center line with the bearing cover. When checking with a feeler gauge within the above range, the 0.03mm feeler gauge shall not be inserted into 1 / 3 of the width of the outer ring.
(15) After the bearing outer ring is installed, it should touch the end face of the bearing cover at the positioning end evenly.
(16) After the rolling bearing is installed, the rolling shall be flexible and stable by hand.
(17) The joint surfaces of the upper and lower bearing shells shall be close to each other and cannot be checked with a 0.05mm feeler gauge.
(18) When fixing the bearing bush with the locating pin, drill, ream and match the pin under the condition of ensuring that the opening and closing surface and end face of the bush are equal and flush with the opening and closing surface and end surface of the relevant bearing hole. The pin shall not be loose after being driven in.
(19) When the surface of the alloy bearing liner is yellow, it is forbidden to use it. It is forbidden to have nucleation in the regular touch angle. The nucleation area outside the touch angle shall not be greater than 10% of the total area of the non touch area.
(20) The reference end face of the gear (worm gear) shall fit the shaft shoulder (or the end face of the positioning sleeve), and it cannot be checked with a 0.05mm feeler gauge. The perpendicularity between the gear reference end face and the axis shall be ensured.
(21) before assembly, strictly check and remove the sharp corners, burrs and foreign matters left during part processing. Make sure that the seals are not scratched when installed.
(22) there shall be no cold lap, crack, shrinkage cavity, penetrability and serious damage defects on the surface of the casting.
(23) the casting shall be cleaned without burrs and flash. The pouring and riser on the non machining indication shall be cleaned and flush with the surface of the casting.
(24) the cast words and marks on the non machined surface of the casting shall be clear and legible, and the position and font shall meet the requirements of the drawing.
(25) the pouring riser, flying thorn, etc. shall be removed from the casting. The residual amount of pouring and riser on the non machined surface shall be leveled and polished to meet the surface quality requirements
(26) the molding sand, core sand and core bone on the casting shall be removed and cleaned.
(27) the inclined parts and dimensions of the casting shall be symmetrically equipped along the inclined plane.
(28) the wrong type, boss casting deviation, etc. shall be corrected to achieve the oil slip transition, so as to ensure the appearance quality.
(29) the surface of the casting shall be flat, and the gate, burr, sand sticking, etc. shall be removed and cleaned.
(30) casting defects such as cold shuts, cracks and holes that are detrimental to application are not allowed.
(31) remove all dirt, dirt, rust, etc. on the surface of steel before painting.
(32) the non machined surface of machine product castings shall be shot peened or roller treated to meet the requirements of cleanliness SA2 1 / 2.
