The Double Side Lapping Machine adopts a planetary transmission structure. Valve plates are placed inside the carrier. The upper and lower lapping plates rotate in opposite directions, and the workpiece generates a compound motion of revolution and rotation simultaneously, completing lapping of both surfaces in one pass. The synchronous counter-lapping mode eliminates clamping errors caused by separate single-side machining and ensures consistent material removal rate on both sides of the valve plate.

Equipped with a servo pressure control system, the machine can set segmented loading pressure according to workpiece material to prevent valve plate deformation from excessive pressure. High-rigidity lapping plates maintain stable flatness accuracy. Combined with an on-line thickness monitoring module, it feeds back machining allowance in real time and automatically adjusts lapping duration and plate rotational speed. Suitable for various metal valve plates, the machine can carry out rough lapping and fine lapping sequentially to efficiently remove scratches, burrs and subsurface damage layers on blanks.

Valve plates after double-side lapping feature high parallelism between two surfaces and uniform surface roughness, ensuring sealing performance after assembly. Machining parameters can be saved to guarantee consistency in mass production. It is applicable for prototype trial production and volume manufacturing of valve plates for precision hydraulic and pneumatic components.