Of dimension of the machining surplus of gear-box body, working procedure and semifinished product dimension affirmatory

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The material of the spare parts of 12 gear-box casing uses Jiang Huai casting pig is cast. Gear-box material is HT20-40-GB976-61, HB is 170-241, produce a type for large quantities of quantities, use cast semifinished product. (1) 12 gear-box casing is Jiang Huai cast, have particular demand to the structural craft of semifinished product: The wall of ① cast is large answer and appropriate, even, must not have abrupt change. ② casts round horn to want proper, do not get part having a tip. ③ cast structure should simplify as far as possible, should have and remove modular rake reasonably, in order to reduce cent face, fuse, facilitate a model. The ply that ④ strengthens costal region and distributing should reasonable, lest cool when cast is out of shape or produce crackle. The select material of ⑤ cast wants reasonable, due better but casting sex. The requirement with semifinished product appearance, certain measure (2) appearance of design semifinished product, dimension still should consider: ① machines the geometrical appearance of the face to answer each as far as possible simple. ② craft is fiducial agree in order to design fiducial phase. Clip of ③ facilitating outfit, treatment and examination. ④ structure element is unified, use common device and standard cutting tool to undertake machining as far as possible. When affirmatory semifinished product, want to consider economy. Although the shape size of semifinished product and spare parts are adjacent, can reduce mental allowance, raise the utilization rate of material, reduce finished cost, but it is difficult that such likelihoods bring about semifinished product to make, need uses expensive semifinished product to make equipment, raise the production cost of semifinished product. Accordingly, the must consider spare parts cost certainly issue of the phyletic appearance of semifinished product and dimension but the performance characteristics that should assure a spare parts. After the phyletic appearance of semifinished product and measure are certain, when necessary but accordingly draw gives semifinished product picture. CNC Milling