GB560041A - A method of and means for attaining constant yield point in the strain hardening of steel by twisting - Google Patents
A method of and means for attaining constant yield point in the strain hardening of steel by twistingInfo
- Publication number
- GB560041A GB560041A GB1292342A GB1292342A GB560041A GB 560041 A GB560041 A GB 560041A GB 1292342 A GB1292342 A GB 1292342A GB 1292342 A GB1292342 A GB 1292342A GB 560041 A GB560041 A GB 560041A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- twisting
- twist
- twisted
- yield point
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
- C21D7/105—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars of concrete reinforcing bars
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
560,041. Hardening steel by twisting. SQUARE GRIP REINFORCEMENT CO. (LONDON), Ltd., and GLEGG, G. L. Sept. 14, 1942, No. 12923. [Class 83 (iv)] To obtain a constant yield point in bars for reinforcing concrete &c., hardened by twisting, the torque reaction, during twisting is used to determine the extent of twist. When this reaction reaches a desired value it may automatically cut out the motor, cause a clutch arranged between motor and work to slip, or otherwise cut off power transmission. For instance the normally stationary end of the bar 10 may be secured to a lever 11 and twist thereof be resisted by a spring 12 or the like. When the other end is twisted by motor-driven gearing until the requisite torque is reached movement of the lever 11 operates a switch S in the circuit of the electric motor drive or of an electrical transmission device interposed between any power unit and the work. In modifications the current operating the prime motor or the motor of an electric transmission device is arranged to open said switch S at a given amperage or this is indicated by an ammeter and the attendant opens the switch. In other modifications a power unit is chosen having a load/speed characteristic such that, when operated for a' definite period to twist the bar, speed reduction suffered through torque reaction results in the bar being twisted only the desired amount to attain the desired yield point. An electric motor for this purpose is a slip-ring alternating current motor having a selected external resistance in the rotor circuit. In another modification the rod is twisted by gearing 17, Fig. 2, and a fluid pressure motor 15 which is driven by fluid in a reservoir 20 which is kept at a constant pressure by a pump 19 and adjustable relief valve 21 so that when the resistance to twisting reaches the desired value the pressure in the reservoir 20 has risen to the. point at which it opens the valve 21.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1292342A GB560041A (en) | 1942-09-14 | 1942-09-14 | A method of and means for attaining constant yield point in the strain hardening of steel by twisting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1292342A GB560041A (en) | 1942-09-14 | 1942-09-14 | A method of and means for attaining constant yield point in the strain hardening of steel by twisting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB560041A true GB560041A (en) | 1944-03-16 |
Family
ID=10013602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1292342A Expired GB560041A (en) | 1942-09-14 | 1942-09-14 | A method of and means for attaining constant yield point in the strain hardening of steel by twisting |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB560041A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2616478A (en) * | 1947-12-04 | 1952-11-04 | D Avaucourt Pierre De Vitry | Method and apparatus for forming sawing wires |
| US2699196A (en) * | 1952-02-23 | 1955-01-11 | Hydropress Inc | Safety device for roller levelers |
| US6189359B1 (en) * | 1998-10-01 | 2001-02-20 | C.M.L. Costruzioni Meccaniche Liri S.R.L. | Twisting machine for polygonal cross-section bars |
-
1942
- 1942-09-14 GB GB1292342A patent/GB560041A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2616478A (en) * | 1947-12-04 | 1952-11-04 | D Avaucourt Pierre De Vitry | Method and apparatus for forming sawing wires |
| US2699196A (en) * | 1952-02-23 | 1955-01-11 | Hydropress Inc | Safety device for roller levelers |
| US6189359B1 (en) * | 1998-10-01 | 2001-02-20 | C.M.L. Costruzioni Meccaniche Liri S.R.L. | Twisting machine for polygonal cross-section bars |
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