Machining of shaft parts
For example, we take the FAW-Volkswagen Jetta Audi car engine and transmission parts production line as an example. Almost all cutting knives and tools (tools) are imported products (from 49 foreign companies), and key process equipment ( machine tools ) are also imported. Special rigid CNC products. The typical technical features are briefly described as follows:
Selection of tool materials: mainly based on superhard tool materials. High-strength cast iron parts are machined with CBN, SiN ceramics, Ti-based ceramics and TiCN coated tool materials, with a milling speed of 2200m/min. High-Si-Al castings are machined with PCD and ultra-fine carbide tools . The milling speed is also up to 2200m. /min, drilling and reaming speed of 80 ~ 240m / min; using SiN ceramics, Ti-based ceramics and TiCN coating tools to machine precision forged structural steel parts, turning speed up to 200m / min; using high Co powder metallurgy surface coating TiCN High-speed steel integral broach, hob, shaving cutter, and special broach for carbide machine clamp combination, processing all kinds of precision forged steel and cast iron parts, broaching speed 10~25m/min, hobbing speed 110m/ Min, shaving cutting speed 170m/min.
The machining of the crankshaft main journal and the connecting rod journal of the automobile is a double-station car--a special tool for broaching. The cutter head has a diameter of 700mm, and the cutter disc is equipped with 40 pieces of carbide coated blades. Each 10 pieces is 1 set, the cutting speed is 150m/min, the fast forward speed is 4.6m/min, and the radial cutting allowance is 1.5. ~3mm.
In addition, some parts of the shaft end of the outer cylindrical surface processing using the forming combination of external milling, reaming special tools, one pass to complete the outer circle and end face roughing, instead of single-blade turning process.
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