Transmission Cases, like engineblocks, are all automotives key components. Also, transmission case is afundamental part of transmission. It generates Input assembly, Take-off assembly,and gearshift assembly of transmission together as a whole according to certainrelative position. In addition, it supports the output shaft for torque outputaccording to certain relationships of transmission ratio. The machining qualitydirectly affects the accuracy of assembly, performance of movement, flexibilityof gear shifting, noise of gears, sealed performance and lifetime forTransmission Assembly. Therefore, the performance of transmission assembly isdetermined by the machining quality of Transmission Cases.

      Transmission Cases are often not in a regular shape with multiple partsfor machining, and the machining techniques are so complex that variousmachining operations needed to complete the machining. Double intermediate shafttransmission case is a typical grey cast iron part with thin-walled. Its mainbody includes main tank and vice tank. There are three center holes in thefloor. The vice tank is opening on one side, with 5 through holes on it withthe size of 510mm * 350mm * 480mm. The workpiece material is HT 200. (Grey CastIron with HB180)

    Face milling

    Tool：FMD02-080-A27-PN11-08

    Insert：PNEG110512R-CM

    Cutting data：Vc=120m/min，fz=0.3mm/z

    Hole-making

    Tool：1534SU03 series drill

    Cutting data：Vc=60～80m/min，fr=0.2mm/r

    Counterboring

    Tool：GM-4E Series Solid Carbide Endmills

    Cuttingdata：Vc=80m/min，fz=0.15mm/z

    Hole Chamfering

    Tool：1143SC90-2000

    Cutting data：Vc=150m/min，fr=0.2mm/r

    Reaming

    Tool：3102H7  seriesreamer

    Cutting data：Vc=100m/min，fr=0.1mm/r

    hread machining

    Tool：4202C  seriestap

    Cutting data：Vc=10～15m/min，fr=1.5～2mm/r

    Machining for Boss Face

    Tool：EMP01-032-XP32-AP11-04

    Cutting data：Vc=70m/min，fz=0.1mm/z

    Shallow Hole-making (Φ27)

    Tool：ZTD03-250-XP25-SP07-02

    SPGT07T308-PM      SPGT07T308-PM

    Vc=80m/min，fz=0.2mm/z

    Boring and chamfering (Φ27)

    Tool： Tailor-made Complex Tools (Boring and Chamfering)

    Cuttingdata：Vc=80m/min，fr=0.15mm/r

    Thread machining

    Tool：ThreadMilling Cutters

    Cutting data：Vc=100m/min  fr=0.2mm/r

    Internal Chamber

    Taperangle Machining

    Tool：Tailor-madeComposite Tapper Drills

    Cutting data：Vc=35m/min，fr=0.15mm/r

    Boring

    Tool：Double-edged Modular Rough Boring Tools

    Insert：CCMT120408-HM

    Cutting data：Vc=120m/min，fz=0.2mm/z

Internal BackBoring

Tool： New type Finish Boring Tools

Cutting data：Vc=150m/min，fz=0.1mm/z