In terms of machining skills, only by strictly abiding by these skill requirements can the processed products become more standard and reasonable. The detailed skill requirements are as follows:
(1) There shall be no scratch, scratch and other defects damaging the surface of the parts on the surface of the parts.
(2) Remove oxide scale from parts.
(3) Undeclared shape shall conform to the requirements of GB1184-80, and the allowable error of unspecified length scale shall be ± 0.5mm.
(4) The casting service belt is symmetrical to the basic dimension equipment of the blank casting.
(5) When installing 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 should be prevented from entering the system.
(7) The parts and components to be installed can only be installed with the certificate of inspection.
(8) Before installation, it is necessary to tidy and clean the parts, without burrs, fins, oxide skin, rust, chips, oil stains, colorants 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 prohibited to impact or use inappropriate screwdrivers and wrenches. The screw groove, nut, screw and bolt head shall not be damaged after fastening.
(12) For fasteners required by regular tightening torque, it is necessary to select a torque wrench and tighten according to the regular tightening torque.
(13) The remaining adhesive shall be removed after bonding.
(14) The outer ring of the bearing must not get stuck with the semicircular hole of the open bearing seat and bearing cover; The semicircular holes of the bearing outer ring, open bearing seat and bearing cover shall be touched well. When viewed by painting, they shall be evenly touched within 120 ° symmetrical to the centerline of the bearing seat and 90 ° symmetrical to the centerline of the bearing cover. When viewing 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) The bearing outer ring should touch the end face of the bearing cover at the locating end evenly after installation.
(16) After the rolling bearing is installed, the rolling shall be flexible and stable by hand.
(17) The joint surface of the upper and lower bearing pads shall be close to each other and cannot be checked with a 0.05mm feeler gauge.
(18) When fixing bearing pads with locating pins, drill and ream the matching pins under the condition that the pad mouth and end face are equal to the opening and closing surfaces and end faces of the relevant bearing holes. The pin shall not be loose after driving.
(19) The alloy bearing liner shall not be used when its surface is yellow. There shall be no 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) should fit with the shaft shoulder (or the end face of the positioning sleeve), and 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 seal is not scratched when it is installed.
(22) Cold shut, crack, shrinkage cavity, penetrating defect and serious damage defect are not allowed on the surface of casting.
(23) The castings shall be cleaned and free of burrs and flash. The gating and riser on the non processing indication shall be aligned with the casting surface.
(24) The casting 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) For castings, the sprue and riser, flying spurs, etc. shall be removed. The residual amount of gating 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) For the inclined parts of the casting, the standard service belt shall be symmetrically equipped along the inclined plane.
(28) Correct the wrong type and boss casting deviation to ensure smooth transition and ensure the appearance quality.
(29) The surface of the casting shall be flat, and the gate, burr, sand, etc. shall be removed and cleaned.
(30) Casting defects such as cold shut, crack and hole which are harmful to application are not allowed.
(31) Before painting, it is necessary to remove rust, oxide skin, grease, dust, soil, salt and dirt on the surface of all steel products that need to be coated.
(32) The non machined surface of machine product castings shall be shot blasted or roller treated to meet the requirements of cleanliness Sa2 1/2.
