GB867153A - Improvements relating to screw threaded members and the manufacture thereof - Google Patents
Improvements relating to screw threaded members and the manufacture thereofInfo
- Publication number
- GB867153A GB867153A GB16462/59A GB1646259A GB867153A GB 867153 A GB867153 A GB 867153A GB 16462/59 A GB16462/59 A GB 16462/59A GB 1646259 A GB1646259 A GB 1646259A GB 867153 A GB867153 A GB 867153A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thread
- flank portions
- screw
- rockwell
- rolled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
867,153. Screw-threads. ELASTIC STOP NUT CORPORATION OF AMERICA. May 13, 1959 [June 9, 1958], No. 16462/59. Class 80 (3). [Also in Groups XXII and XXV] In a method of forming an external thread in a metal body, e.g. a screw, a high tensile bolt or a stud having a high fatigue resistance, the thread-form inwardly of the pitch cylinder is rolled while the remainder of the thread is freely extruded outwardly beyond the pitch cylinder. A unified thread is formed by dies 36, Fig. 4, with differently-inclined flank portions 40, 44 and a dimension from root 42 to crest 38 greater than that of the thread to be formed. A rolled or coined surface is produced below the pitch-line while metal is freely extruded, i.e. without touching the walls of die cavities 46 to form a portion 47 which may be subsequently ground or otherwise machined to the finished form. In a modification, Fig. 5, a thread form is produced having flank portions 57 with an included angle of 70 degrees and flank portions 59 with an included angle of 60 degrees, this thread being more easily formed with existing machining tools than a 60 degree thread. Prior to threading the blank may be hardened to above 37 Rockwell C and preferably between 42 and 53 Rockwell C to produce a high tensile bolt.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US867153XA | 1958-06-09 | 1958-06-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB867153A true GB867153A (en) | 1961-05-03 |
Family
ID=22200394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB16462/59A Expired GB867153A (en) | 1958-06-09 | 1959-05-13 | Improvements relating to screw threaded members and the manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB867153A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4764067A (en) * | 1985-11-22 | 1988-08-16 | Jsm Screw Co., Ltd. | Screw with groove for self-lock and method and rolling flat die for manufacturing the same |
| WO2006077485A1 (en) * | 2005-01-20 | 2006-07-27 | Itw New Zealand Limited | Improvements in and relating to threaded rods |
-
1959
- 1959-05-13 GB GB16462/59A patent/GB867153A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4764067A (en) * | 1985-11-22 | 1988-08-16 | Jsm Screw Co., Ltd. | Screw with groove for self-lock and method and rolling flat die for manufacturing the same |
| WO2006077485A1 (en) * | 2005-01-20 | 2006-07-27 | Itw New Zealand Limited | Improvements in and relating to threaded rods |
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