What technical requirements should be observed in Changzhou machining?

What technical requirements should be observed in Changzhou machining? Only by complying with these technical requirements can the finished mechanical product be more standardized and reasonable. The specific technical requirements are as follows:

(1) Remove the oxide scale from the parts.

(2) The machined surface of the part shall be free of defects such as scratches, scratches, etc. that may damage the surface of the part.

(3) The unmarked shape tolerance shall comply with the requirements of GB84-80, and the allowable deviation of unmarked length and dimension shall be± 0.5mm。

(4) The casting tolerance zone is symmetrical to the basic dimensional configuration of the blank casting.

(5) When assembling rolling bearings, it is allowed to use oil heating for hot charging, and the temperature of the oil shall not exceed 00 ℃.

(6) When assembling the hydraulic system, it is allowed to use sealing filler or sealant, but it should be prevented from entering the system.

(7) Parts and components that enter the assembly must have a certificate from the inspection department before they can be assembled.

(8) Parts must be cleaned and cleaned before assembly, and must be free of burrs, fins, oxide skin, rust, chips, oil, colorants, and dust.

(9) Before assembly, the main fitting dimensions of parts and components, especially the interference fitting dimensions and related accuracy, should be reviewed.

(10) During assembly, parts are not allowed to bump, collide, scratch, or rust.

(11) When tightening screws, bolts, and nuts, it is strictly prohibited to strike or use inappropriate screwdrivers and wrenches. After fastening, the screw slot, nut, screw, and bolt head must not be damaged.

(12) For fasteners with specified tightening torque requirements, torque wrenches must be used and tightened according to the specified tightening torque.

(13) After bonding, excess adhesive flowing out should be removed.

(14) The semicircular holes of the bearing outer ring, the open bearing seat, and the bearing cover must not be stuck; The outer ring of the bearing should be in good contact with the semicircular hole of the open bearing seat and bearing cover. When using color coating for inspection, it should be symmetrical to the center line of the bearing seat by 20&deg 90° symmetrical to the center line with the bearing cover; The contact should be uniform within the range of. When checking with a feeler gauge within the above range, a 0.03mm feeler gauge should not be inserted into/3 of the outer ring width.

(15) After assembly, the bearing outer ring should be in uniform contact with the end face of the positioning end bearing cover.

(16) After installation, the rolling bearing should rotate flexibly and smoothly by hand.

(17) The joint surfaces of the upper and lower bearing shells should be closely fitted and cannot be checked with a 0.05mm feeler gauge.

(18) When fixing the bearing bush with a positioning pin, it is necessary to drill and match the pin while ensuring that the opening and end faces of the bush are flush with the opening and end faces of the relevant bearing holes. The pin must not loosen after being driven in.

(19) "When the surface of the alloy bearing liner is yellow, it is not allowed to use it, and there is no nucleation within the specified contact angle. The nucleation area outside the contact angle should not be greater than 0% of the total area of the non-contact area.".

(20) The reference end face of the gear (worm gear) and the shaft shoulder (or locating sleeve end face) should fit closely, and cannot be checked with a 0.05mm feeler gauge. The perpendicularity requirements between the gear reference end face and the axis shall be ensured.

(21) Before assembly, strictly inspect and remove the remaining sharp corners, burrs, and foreign matters during the processing of parts. Ensure that the seal is not scratched when installed.

(22) Cold shuts, cracks, shrinkage cavities, penetrating defects, and serious defects such as imperfections are not allowed on the surface of the casting.

(23) Castings should be cleaned without burrs or flash edges, and the gating and riser on non machined surfaces should be cleaned and flush with the surface of the casting.

(24) The casting characters and marks on the non machined surface of the casting shall be clear and identifiable, and the position and font shall meet the requirements of the drawing.

(25) Castings shall be cleaned of risers, flying burrs, etc. The residual amount of the sprue and riser on the non machined surface should be spaded and polished to meet the surface quality requirements.

(26) The molding sand, core sand, and core bone on the casting should be cleaned.

(27) For inclined parts of the casting, the dimensional tolerance zone shall be symmetrically arranged along the inclined surface.

(28) Misalignment and convex casting deviation should be corrected to achieve a smooth transition and ensure appearance quality.

(29) The non machined surfaces of machine product castings require shot peening or roller treatment to meet the requirements of cleanliness Sa2/2.

(30) The surface of the casting should be flat, and the gates, burrs, and sand adhering should be cleaned.

(31) Castings are not allowed to have casting defects such as cold shuts, cracks, and holes that are detrimental to use.

(32) Before painting, rust, oxide skin, grease, dust, soil, salt, and dirt must be removed from the surface of all steel parts that require painting.