In terms of machining skills, only by complying with these skill requirements can the processed products be more standard and reasonable. The detailed skill requirements are as follows
(1) The processing appearance of parts shall be free of defects such as scratches and scratches that damage the appearance of parts.
(2) Remove scale from parts.
(3) Civil servants without injection form shall meet the requirements of gb1184-80, and the agreed error of length scale without injection shall be ± 0.5mm.
(4) The casting belt is symmetrical to the basic dimension equipment of the blank casting.
(5) When installing rolling bearings, it is agreed to heat them with oil, and the oil temperature shall not exceed 100 ℃.
(6) When installing the hydraulic system, it is agreed to use sealing filler and sealant, but access to the system must be prevented.
(7) Certificate of conformity of parts and components to be inspected before entering the installation.
(8) The parts must be cleaned before installation, and there shall be no burr, flash, oxide skin, rust, chip, oil stain, colorant, dust, etc.
(9) Before installation, recheck the main cooperation dimensions of parts and components, especially the excess cooperation dimensions and relevant accuracy.
(10) Parts shall not collide, collide, damage or rust during installation.
(11) When fastening screws, bolts and nuts, it is forbidden to impact or use improper rotating tools and wrenches. After fastening, the screw groove, nut, screw and bolt head shall not be damaged.
(12) For fasteners with regular tightening torque requirements, a torque wrench must be selected and tightened according to the regular tightening torque.
(13) After bonding, remove the remaining adhesive flowing out.
(14) The semicircular holes of the bearing outer ring, the open bearing seat and the bearing cover shall not be blocked. The contact between the bearing outer ring, the open bearing seat and the semicircular hole of the bearing cover is excellent. During color inspection, it shall be in uniform contact within the range of 120 ° symmetrical with the bearing seat and 90 ° symmetrical with the bearing cover. When checking with a feeler gauge within the above range, a 0.03mm feeler gauge shall not be inserted into 1 / 3 of the width of the outer ring.
(15) After installing the bearing outer ring, it should be in uniform contact with the end face of the bearing cover at the positioning end.
(16) After the rolling bearing is installed, it can roll flexibly and stably by hand.
(17) The joint surfaces of the upper and lower bearing shells must be in close contact and cannot be seen with a 0.05mm feeler gauge.
(18) When fixing the bearing bush with the locating pin, hinge and sell the bearing bush under the condition of ensuring that the opening and closing surface and end face of the bush are equal to the opening and closing surface and end bread of the relevant bearing hole. It shall not be loose after cancellation.
(19) It is forbidden to use the alloy bearing liner when its appearance is yellow. The nucleation phenomenon is prohibited in the regular touch angle. The nucleation area outside the touch angle shall not exceed 10% of the total area of the non touch area.
(20) The reference end face of the gear (worm gear) must be consistent with the shoulder (or the end face of the positioning sleeve), and cannot be seen with a 0.05mm feeler gauge. Ensure that the perpendicularity of the gear reference end face and axis meets the requirements.
(21) before assembly, strictly check and remove the sharp corners, burrs and foreign matters left during part processing. Ensure that the seal is installed without injury.
(22) the casting appearance does not agree with the defects of cold lap, crack, shrinkage cavity, penetration and serious damage.
(23) castings shall be cleaned without burrs and flash. The outlet indicated by non machining shall be flat with the appearance of the casting.
(24) the cast words and marks on the non machined appearance of castings shall be clearly identified, and the position and font shall meet the pattern requirements.
(25) the outlet, thorn, etc. of the casting shall be removed. The export residue of non processed appearance shall be flat and polished to meet the appearance quality requirements.
(26) the molding sand, core sand and core bone on the casting shall be removed.
(27) for the inclined part of the casting, the scale band shall be symmetrically equipped along the inclined plane.
(28) correct the alignment and dislocation, boss casting deviation, etc. to achieve oil slip transition and ensure appearance quality.
(29) the surface of the casting shall be flat, and the gate, burr, sand sticking, etc. shall be removed.
(30) castings do not promise casting defects such as cold shuts, cracks and holes that are detrimental to application.
(31) rust, scale, grease, dust, soil, salt and dirt shall be removed from the appearance of all steel products to be sprayed before spraying.
(32) the non machined appearance of mechanical product castings needs shot peening or roller treatment to meet the requirements of cleanliness Sa21 / 2.