What are the technical requirements in machining?

Machining is mainly precision machining, because precision machining can highlight the importance of machining products at work. Now machining is important for every project and technology. Now machining is getting better and better, and technology is also better. Now, there are more purchases of machining raw materials. With the development of society, we are With continuous development, many machining industries are expanding at a fast speed.

(1) Remove oxide skin from parts.

(2) There shall be no scratch, scratch and other defects on the machined surface of parts.

(3) The tolerance of undeclared shape shall meet the requirements of gb1184-80, and the allowable deviation of undeclared length dimension shall be ± 0.5mm.

(4) The tolerance zone of casting is symmetrical to the basic dimension configuration of rough casting.

(5) It is allowed to heat the assembled rolling bearing with engine oil, and the temperature of the oil shall not exceed 100 ℃.

(6) When assembling 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 to be assembled can be assembled only after they have the certificate of inspection department.

(8) Parts must be cleaned and cleaned before assembly, without burr, flash, oxide skin, rust, chip, oil stain, colorant and dust, etc.

(9) Before assembly, the main fitting dimensions of parts and components, including interference fit dimensions and relevant accuracy, shall be rechecked.

(10) Parts shall not be knocked, bumped, scratched or rusted during assembly.

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

(12) The fasteners with specified tightening torque shall be tightened with torque wrench according to the specified tightening torque.

(13) Excess adhesive shall be removed after bonding.

(14) The semicircle holes of the bearing outer ring, the open bearing seat and the bearing cover shall not be stuck; the semicircle holes of the bearing outer ring, the open bearing seat and the bearing cover shall be in good contact. During the color coating inspection, they shall be in uniform contact within the range of 120 ° symmetrical to the center line and 90 ° symmetrical to the center line.

(15) After the bearing outer ring is assembled, it shall be in even contact with the end face of the bearing cover at the locating end.

(16) After the rolling bearing is installed, it shall rotate flexibly and stably by hand.

(17) The joint surface of the upper and lower bearing shells shall be closely pasted and cannot be checked with a 0.05mm feeler gauge.

(18) When fixing the bearing bush with the locating pin, the reaming and pin distribution shall be conducted under the condition that the opening and closing surfaces and the end face of the bearing bush mouth and the end face are flush with the opening and closing surfaces of the relevant bearing holes and the end face package. The pin shall not be loose after driving.

(19) When the surface of the alloy bearing liner is yellow, it is not allowed to use it, and there is no phenomenon of nucleation within the specified contact angle. The area of nucleation outside the contact angle shall not be greater than 10% of the total area of the non-contact area.

(20) The reference end face of gear (worm gear) and the end face of shaft shoulder (or locating sleeve) shall fit, and the 0.05mm feeler gauge shall be used to check whether they can not enter. The perpendicularity of the gear reference end face and the axis shall be ensured.