FIELD: process engineering.
SUBSTANCE: invention relates to metal forming, particularly, to production of terminal bolts for track rail joints. Bolt rectangular head and is spherical thrust face are roughed and finished. Then, said head and its thrust surface are calibrated while chamfer is made on bolt rod end. Pre-shaping of head and its thrust face is effected at one stamping position. Note here that head is shaped to rectangle. Rectangle side makes (0.7-0.9)S where S is larger or smaller side of finished rectangular bolt head. Head and thrust face calibration is performed at stamping position simultaneously with rod reduction for thread cutting and chamfering.
EFFECT: uniform load distribution at cold-upsetting tool, hence, favourable flow of metal, accurate sizes and higher hardness.
5 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR MANUFACTURING TERMINAL BOLTS | 2020 |
|
RU2755786C1 |
| METHOD OF FORGING TERMINAL BOLTS | 2011 |
|
RU2478451C1 |
| METHOD FOR SEAMLESS UPSETTING OF INSERTION BOLTS FOR RAILWAY FASTENINGS | 1995 |
|
RU2073582C1 |
| METHOD FOR SEAMLESS UPSETTING OF CLAMPING BOLTS FOR RAILWAY FASTENINGS | 1995 |
|
RU2073581C1 |
| CLAMP BOLTS MANUFACTURING METHOD | 2006 |
|
RU2303502C1 |
| METHOD OF HEADING INSERTED BOLTS WITH RADIAL TAGS, DEVICE FOR PRELIMINARY SHAPING OF TAGS AND DEVICE FOR FINAL SHAPING OF TAGS | 1999 |
|
RU2168386C1 |
| METHOD TO STAMP ROD-TYPE PIECES WITH A HEAD PROVIDED WITH RADIAL SPROUTS, A PUNCH FOR PREMOULDING THE SPROUTS OF ROD-TYPE PIECES AND A PUNCH FOR FINISHED MOULDING SPROUTS OF THE HEAD OF ROD-TYPE PIECES | 1992 |
|
RU2034677C1 |
| METHOD FOR FORMING RELIEF SURFACE OF THIN BLANK | 1993 |
|
RU2011462C1 |
| PRODUCTION METHOD OF HEADED BOLT ALLOWING INTERNAL POLYHEDRON AND FLANGE, ON COLD-UPSETTING AUTOMATION | 2007 |
|
RU2350424C1 |
| METHOD FOR CUTTING OFF HEADS OF ROD ARTICLES AND TOOL FOR PERFORMING THE SAME | 2006 |
|
RU2312731C1 |
