What are the options of CNC milling machine processing according to the principle of fine benchmark selection?

(1) φ32H7 hole is limited to four degrees of freedom, the bottom surface is limited to one degree of freedom. This scheme has a datum mismatch error for the size of 4±0.1mm, and the positioning pin is slender, poor rigidity, so it is not good.

(2) the bottom limit three degrees of freedom, phi 32 h7 hole limit two degrees of freedom the scheme work piece can be realized in a long diamond pin up, for the three design requirements are benchmark superposition, high-speed computer gongs processing phi is only 32 h7 hole for the underside of the parallelism error will affect two holes in the vertical plane of parallelism, should limit in the phi 32 h7 boring.

(3) The bottom surface is limited by three degrees of freedom, and the K surface is limited by two degrees of freedom. The fixture is relatively simple. Design size 4±0.1 mm datum overlap; The size of 51±0.1 mm process reference is the center line of the hole φ32H7, and the positioning reference is the K surface, the positioning size is 6±0.1 mm, there is a reference does not coincide with the error, the size is equal to 0.2mm; Two holes parallelism 0.02mm also has a datum does not coincide error, its size is equal to 0.03mm. It can be seen that the datum misalignment error of this scheme has exceeded the allowable range and is not feasible.

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