Valve block B

Drilling and tapping shall be carried out according to the design requirements of the hydraulic valve block processing drawings: the slender hole shall be processed first, and then the short and coarse hole shall be processed. There shall be no flash and burr at the intersection of the two holes. The perpendicularity error between the thread hole and the base plane of all fine thread is not more than 0.03mm; Thread accuracy shall be in accordance with 6h specified in GB 197; The thread surface shall be free of defects such as black skin, crack, bump, burr, double tooth tip and incomplete buckle; The depth of coarse thread is twice the diameter of thread (unless otherwise specified in the drawing). The chamfer of the screw in side is 60 before processing the thread °， The chamfer depth is equal to the bolt chamfer depth. The oil hole in the oil circuit block makes the pressure drop of fluid flowing through the channel in the whole working temperature and flow capacity range of the system, which will not adversely affect the efficiency and response of the system.

Technical requirements for outsourcing processing of hydraulic oil way valve block: the raw materials of oil way valve block (ductile iron, forging, steel bar, etc.) shall be purchased in strict accordance with the drawing requirements. The raw materials purchased should meet the technical requirements. Milling six surfaces of oil way valve block: milling shall be carried out according to the requirements of the drawing on the overall dimensions, the dimensional tolerance shall be strictly controlled within the design requirements, and the grinding amount of each side shall be 0.2-0.5mm. The perpendicularity between adjacent machining surfaces shall not be greater than 0.05mm/100mm. The unevenness of two corresponding surfaces shall not be greater than 0.03mm. The surface shall not be bumped, scratched, missing angle, and the outer edge shall be blunt by 1.5 ~ 2 × forty-five °， Deburring, smooth handle. The surface roughness is not greater than RA = 6.3 μ m。