GB892211A - Improvements in thread-rolling heads - Google Patents
Improvements in thread-rolling headsInfo
- Publication number
- GB892211A GB892211A GB1665957A GB1665957A GB892211A GB 892211 A GB892211 A GB 892211A GB 1665957 A GB1665957 A GB 1665957A GB 1665957 A GB1665957 A GB 1665957A GB 892211 A GB892211 A GB 892211A
- Authority
- GB
- United Kingdom
- Prior art keywords
- roll
- thread
- ridges
- rolls
- truncated
- 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
- B21H3/04—Making by means of profiled-rolls or die rolls
- B21H3/042—Thread-rolling heads
- B21H3/046—Thread-rolling heads working radially
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Fiber Materials (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Rolling Contact Bearings (AREA)
Abstract
892,211. Rolling screw-threads. HERBERT Ltd., ALFRED. May 9, 1958 [May 25, 1957], No. 16659/57. Class 83 (4). A set of angularly spaced thread forming rolls mounted in a head is provided with annular forming ridges between grooves of constant diameter at right-angles to the axes of the rolls, each roll axis being arranged in the head at an angle relatively to the axis of the workpiece corresponding to the helix angle of the thread to be rolled, in which at least the axially outermost forming ridge at the leading edge of each roll is truncated to have a cross-section that, at least at its crest, is formed by at least one straight line and has a smaller diameter than that of the succeeding ridge of the set and the rolls are mounted in a coacting thread-rolling head so that the positions where the truncated ridges successively contact the workpiece will, if their axial cross-sections are superimposed, lie on a curve. A thread-rolling head includes a portion 11 formed with three sets of internal cam surfaces 12 engaging rollers 13 in pivoted 16 carriers 15 for thread-forming rolls A, B and C, each roll being set at an angle. The equiaxially-spaced series of annular ridges of each roll are longitudinally displaced, by one-third of the pitch of the screw-thread to be formed, relative to the cyclically adjacent roll either by displacement from the respective ends of the rolls, or by distance sleeves located in the head. The first ridge of each roll is truncated so that the cross-section of its operative portion is bounded by three straight lines of which one defines the periphery of a flat land and the others define flanks. The radial penetration of each roll is arranged to be less than that of the preceding roll. The successive ridges of each roll may be truncated in steps in the order in which they come into operation. Each roll may be made reversible by appropriately truncating the ridge or ridges at the opposite end of the roll. Specification 711,759 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1665957A GB892211A (en) | 1957-05-25 | 1957-05-25 | Improvements in thread-rolling heads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1665957A GB892211A (en) | 1957-05-25 | 1957-05-25 | Improvements in thread-rolling heads |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB892211A true GB892211A (en) | 1962-03-21 |
Family
ID=10081298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1665957A Expired GB892211A (en) | 1957-05-25 | 1957-05-25 | Improvements in thread-rolling heads |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB892211A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10464119B2 (en) * | 2012-10-08 | 2019-11-05 | Shanghai Pan-China Fastening System Co., Ltd. | Rolling head for rolling pipe threads, apparatus and pipe column blank machined by the apparatus |
| IT202000003727A1 (en) * | 2020-02-24 | 2021-08-24 | Levi Dancona Pier Lorenzo | MANUFACTURING PROCESS OF A BOLT OR SCREW WITH A PITCH DECURTED BY INCLINED OR CONICAL, CEDABLE ROLLERS |
-
1957
- 1957-05-25 GB GB1665957A patent/GB892211A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10464119B2 (en) * | 2012-10-08 | 2019-11-05 | Shanghai Pan-China Fastening System Co., Ltd. | Rolling head for rolling pipe threads, apparatus and pipe column blank machined by the apparatus |
| IT202000003727A1 (en) * | 2020-02-24 | 2021-08-24 | Levi Dancona Pier Lorenzo | MANUFACTURING PROCESS OF A BOLT OR SCREW WITH A PITCH DECURTED BY INCLINED OR CONICAL, CEDABLE ROLLERS |
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