Fine Grinding:
Grinding the front end, make sure that after the thread is formed, the thread accuracy should be 6g.
Rod Diameter Diameter after grinding
35 mm 33.22~33.32 mm
40 mm 38.88~38.95 mm
45 mm 44.50~44.80 mm
53mm 52.15~52.35 mm
Thread Rolling:
Rolling thread into requested length according to drawings, and measure the length by regular rules piece by piece. Make sure 100% qualified. Acc.to GB/T 196 – GB/T 197 ISO 724:1993
More information for standard, please refer to our download page in this website.
Rolling steps:
1. According to the requirements of ” thread rolling notice”, workers choose proper rollers, guiding board, and adjust oil pressure, then write on the rolling record notebook and production procedure card carefully.
2. Requirements: locate the roller from radial direction, use ring-shape roller to pull thread to the settled position. After formed, thread should be tested easily to pass by screw thread ring gauge with a slightly motion, without any blocks or sluggish. Thread gauge should only pass not more than 2 pitch.
Thread Rolling Cylindrical Dies Specification
| Size | Rolling Cylindrical Dies |
Oil Pressure in radial direction MPa |
Annular oil pressure |
| Φ35mm(M36) | M36*4 | 10~13 | 6~8 |
| Φ40mm(M42) | M42*4.5 | 10~13 | 6~8 |
| Φ45mm(M48) | M48*5 | 12~13 | 8~9 |
| Φ53mm(M56) | M56*5.5 | 13 | 13 |
Note: if anchor bolt or hold down bolt sizes are not in above list, should follow the “thread rolling notice”
Contact us now!
Anyang Longteng Heat Treatment Material Co.,Ltd
Add: Industrial Park, Indu District, Anyang City, Henan Province, P.R.C.
TEL: +86-372-2256782
Email: [email protected]
Post time: Oct-18-2018