R&D of golf shaft production process checkpoint
- 1. mandrel design
- - selection of company(domestic company or foreign company)
- ordering mold
- management of mold
- 2. material design
- - ordering fiber(from domestic company or foreign company)
- fiber warehouse(Low temperature custody is required because the
function of resin is slowly decreased under normal temperature.)
- 3. cutting(cuter)
- - cutting
- 4. rolling(roller)
- - inspect mold surface
- fixing and rolling two-ply sheet
- rolling straight material
- 5. wrapping
(wrapping device) - - wrapping tape
- be careful of distance and number of wrapping pitch
- 6. heat treatment
(electric furnace) - - decide proper temperature and time through technical review
- naturally cooling down to normal temperature
- 7. removing mandrel
- - manufacture fixture precisely to prevent bending of mold during
- 8. trimming
(cutter, centerless) - - cut with cutter(45-46inch for wood, 39inch for iron)
- remove wrapping tape (manual or automatic)
- tip processing(centerless, tip: head side end of the shaft)
- butt processing(centerless, butt: grip side end of the shaft)
- 9. painting
(manual
painting device) - - cleaning and inspection of surface to remove foreign object
- select color of paint and order(form domestic company or foreign company)
- painting
- heat treatment of the surface
- 10. printing
- - screen printing(automatic or semi-automatic)
- heat transfer printing (manual or automatic)
- water transfer printing(manual)
- Install dry hanger and drying room
- 11. testing of
material - - 1 st test: measurement of hardness(torque and endurance),
CPM and common difference
- 2 st test: measurement by actual swing
- training for measurement and positioning or trusting of testing person
- 12. 1st quality
inspection - - standardize inspection item
- empowerment of individual process manager
- 13. 2nd quality inspection
- 14. delivery