With cylindrical establish milling cutter to machine square aperture

013+0.

035) × 10F8(+0.

013+0.

035)mm(sees attached drawing) . Machining square aperture normally is to use knife of special square Kong La to undertake shaping broaching, should machine batch lesser (be like 50) and when doing not have appropriate Fang Kongla knife again temporarily, undertake be repairinged by hand by benchwork form. But of square aperture repair form treatment artificially already take time assures to machine precision hard again. We are explored through relapsing, use standard establishs milling cutter to be in common vertical milling machine (if square Kong Huo is machined on XA5032) ,must succeed, practice proves treatment result is favorable. The article uses the introduction the operation measure that establishs milling cutter to machine square aperture and note. 1 operation measure uses diametical Ø9.

The twist drill of 6mm is in spare parts center (square aperture center) get a via. With diametical Ø0mm+0.

013+0.

025 establish milling cutter to be in center of square aperture of A face edge line mill the first chamfer, groove is deep 6.

1mm, length sees attached drawing) for 21mm(. Turn over the spare parts, and dislocation 90 ° , mill is in in B face and orthogonality of the first chamfer the 2nd chamfer, groove is deep 6.

1mm, length is 21mm. Two chamfer are communicated each other in part of spare parts center, form square hole. To already machining place to go burr keeps abreast of a treatment quality inspection. 2 notes should choose norms dimension to establish milling cutter suitably according to the dimension of square aperture and tolerancepublic errand requirement, can ask to repair by blueprint when necessary grind the real measure that establishs milling cutter cutting part. Before mill chamfer, must search respectively the central line of two chamfer, requirement the central line of two chamfer must orthogonality, can affect the dimension of square aperture and appearance precision otherwise. Groove is deep the 1/2 that should be more than spare parts ply slightly. Usually, the 1/2 that takes groove to compare spare parts ply greatly is deep 0.

1 ～ 0.

2mm(here chooses groove deeply 6.

1mm) . It is advisable that in principle is communicated each other with two chamfers, groove cannot pass greatly deep, groovy length also answer appropriately (cannot grow too) . 3 treatment point is used cylindrical establish milling cutter to machine Fang Kongshi, should consider not to affect the intensity with original part and stiffness basically above all, the structure that does not affect a part at the same time and assemble. When batch is produced, should use special fixture, use special graduation device (like index plate) dislocation, in order to ensure spare parts fixed position is correct, assure the central line orthogonality of two chamfer. With establish milling cutter milling to machine square aperture, do not have special requirement to equipment and cutting tool, the operation goes easily simply, treatment result is favorable, but managing and special broach purchases cost, especially comfortable at sheet, small lot production, carry out very easily also in common machining plant. Of course, this kind of method is not a for love or money applicable, should the structure according to specific spare parts, intensity and assemble wait for a respect to ask take into consideration the circumstances is handled. Machine the principle of square aperture according to establishing milling cutter, also can use 3 blade milling cutter (cutting blade width should wait long with square Kong Bian) or semicircle keyway milling cutter (edge width should wait long with square Kong Bian) in common horizontal milling machine (if square aperture is machined on X62W) . Different is, when the slot that treatment gives grows greatly to be machined than establishing milling cutter with groove slightly somes big. Those who need an attention is, treatment program is feasible whether is the influence that still wants the strength that sees pair of parts and stiffness in permission range. CNC Milling