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Production Process

From the moment material arrives until it is packed, every step carries an inspection. These are the actual manufacturing and quality processes for five representative products.

Camshaft (four-stroke engine)

A forged blank is QT heat-treated, then rough-machined → induction and carburizing surface hardening → finish machining and grinding → non-destructive testing → CMM measurement, in fifteen steps.

15 steps in total

  1. Forging

    STEP 01

    Forging

    Work
    Formed with our own hammers according to the forging drawing for each engine typeAppearance and dimensions checked after forging; forging lot number assigned
    Equipment
    2-ton · 6-ton forging hammers
  2. Heat treatment (QT)

    STEP 02

    Heat treatment (QT)

    Work
    Quenching at 820 – 870 ℃, tempering at 540 – 680 ℃
    Inspection · Check
    Hardness, tensile and impact tests, magnetic particle testing (MT), visual inspectionHeat-treatment certificates, charts and test reports managed
    Equipment
    Hardness tester, tensile · impact tester, MT equipment
  3. 03

    STEP 03

    Incoming inspection

    Work
    Material specification check, mill sheet review
    Inspection · Check
    Chemical composition and dimensional inspection (once per lot)
  4. CNC roughing

    STEP 04

    CNC roughing

    Work
    Flange and shaft roughing, center machining (watch for runout)
    Inspection · Check
    Self-inspection, then entered on the traveler
    Equipment
    CNC lathe
  5. MCT cam profile roughing

    STEP 05

    MCT cam profile roughing

    Work
    Cam profile roughing on a vertical machining center (V-MCT)Product type and serial number engraved
    Inspection · Check
    Profile dimensional inspection, first-article CMM measurement100 % inspection
    Equipment
    V-MCT, CMM
  6. Surface hardening

    STEP 06

    Surface hardening

    Work
    Induction hardening and carburizing (per drawing)
    Inspection · Check
    Heat-treatment chart check; surface hardness and case depth measured (100 %)
    Equipment
    Induction hardening machine, carburizing furnace, hardness tester
  7. Sand blasting

    STEP 07

    Sand blasting

    Work
    Surface scale removed, product tag attached
    Inspection · Check
    Visual inspection (100 %)
  8. CNC finishing

    STEP 08

    CNC finishing

    Work
    Flange finish machining
    Inspection · Check
    Dimensional check sheet completed (100 %)
    Equipment
    CNC lathe
  9. Flange grinding

    STEP 09

    Flange grinding

    Work
    Flange ground on a cylindrical grinder
    Inspection · Check
    Dimensions and specification confirmed (100 %)
    Equipment
    Cylindrical grinder
  10. Hole machining

    STEP 10

    Hole machining

    Work
    Flange holes machined on a horizontal machining center (H-MCT)
    Inspection · Check
    First-article CMM measurement (100 %)
    Equipment
    H-MCT, CMM
  11. Profile grinding

    STEP 11

    Profile grinding

    Work
    Profile ground on a CNC cam grinder
    Inspection · Check
    First-article CMM measurement (100 %)
    Equipment
    CNC grinder, CMM
  12. Non-destructive testing

    STEP 12

    Non-destructive testing

    Work
    Ultrasonic testing (UT), magnetic particle testing (MT)Demagnetized after testing
    Equipment
    UT · MT equipment, demagnetizer
  13. Marking

    STEP 13

    Marking

    Work
    Marked with a dot marker; physical test results recorded
    Inspection · Check
    100 % inspection after marking
    Equipment
    Dot marking machine
  14. Final inspection

    STEP 14

    Final inspection

    Inspection · Check
    Roundness, OD runout, profile and hole position (CMM)Residual magnetism, surface hardness and induction case depth
    Equipment
    Coordinate measuring machine
  15. Rust-proofing · packing

    STEP 15

    Rust-proofing · packing

    Work
    Rust-proofed and packed per the customer's packing procedure
    Inspection · Check
    Visual inspection for dents and rust