US2768430A - Method of producing hollow rock drill steel - Google Patents
Method of producing hollow rock drill steel Download PDFInfo
- Publication number
- US2768430A US2768430A US385034A US38503453A US2768430A US 2768430 A US2768430 A US 2768430A US 385034 A US385034 A US 385034A US 38503453 A US38503453 A US 38503453A US 2768430 A US2768430 A US 2768430A
- Authority
- US
- United States
- Prior art keywords
- cavity
- core
- drill steel
- rock drill
- blank
- 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 - Lifetime
Links
- 229910000831 Steel Inorganic materials 0.000 title description 14
- 239000010959 steel Substances 0.000 title description 14
- 239000011435 rock Substances 0.000 title description 5
- 238000000034 method Methods 0.000 title description 3
- 239000011162 core material Substances 0.000 description 21
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K5/00—Making tools or tool parts, e.g. pliers
- B21K5/02—Making tools or tool parts, e.g. pliers drilling-tools or other for making or working on holes
- B21K5/10—Forming drill-bit shanks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4981—Utilizing transitory attached element or associated separate material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49908—Joining by deforming
- Y10T29/49925—Inward deformation of aperture or hollow body wall
- Y10T29/49934—Inward deformation of aperture or hollow body wall by axially applying force
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49908—Joining by deforming
- Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49908—Joining by deforming
- Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
- Y10T29/4994—Radially expanding internal tube
Definitions
- the core is upset in such a manner that it completely fills up the cavity in the blank, which is possible by using austenitic core material, advantages as regards quality are gained, for example, entrance of air with formation of glow scales in the zone between the core and the cavity Wall is avoided. Furthermore, the wall of the cavity has appeared to be less inclined to formation of folds during the rolling.
- Fig. 1 is a section on the line II of Fig. 2 showing a cross section of a cylindrical core positioned in a cylindrical cavity in a blank
- Fig. 2 is a vertical section on a plane through the axis of the cylindrical cavity in the blank with the core appearing in elevation
- Fig. 3 is a section similar to that of Fig. 2 after the core has been upset to fill the cavity, and
- Fig. 4 is a perspective view of the finished rock drill steel.
- FIG. 1 is the steel blank which is to be rolled to form the drill steel
- 2 is the cylindrical cavity extending axially through the blank
- 3 is the cylindrical core positioned in the cavity 2 and 4
- 4 represent the means for upsetting the core 3 to cause it to tightly fill the cavity 2.
- the core 3 has been inserted into the cavity 3 but there is a thin space between the surface of the core and the Wall of the cavity.
- the core has been upset or compressed endwise and expanded laterally so that it tightly fills the cavity thereby preventing the entrance of air with the formation of scale and/ or the formation of folds in the wall of the cavity during the rolling operation.
- the structure illustrated in Fig. 3 is rolled in the customary manner to reduce its diameter and elongate it to the tubular shape of the drill steel shown in Fig. 4.
- a method of producing rock drill steel from a steel blank which comprises boring said blank to provide it with an axial cylindrical cavity, introducing a cylindrical austenitic steel core into said cavity with its ends extending beyond the ends of said blank, upsetting the extending ends of said core by compressing said ends in the longitudinal direction thereby expanding said core laterally until it completely fills said cavity and prevents the entrance of air between the wall of said cavity and the surface of said core and thereby prevents the formation of scales and folds on the wall of said cavity during the subsequent rolling operation, reducing the resulting structure by rolling to convert said blank into a drill steel and finally pulling said core out of said cavity.
Description
c. E. FOOGDE ET AL METHOD OF PRODUCING HOLLOW ROCK DRILL 'STEEL Filed 001:. 8. 1955 INVENTORS awe Sui/L '3 gm? Oct. 30, 1956 METHOD OF PRODUCING HOLLOW ROCK DRILL STEEL Earl Erik Foogde and Dan Ingemar Bernhard Eriksson,
Haiiefors, Sweden, assignors to Hellefors Bruks Aktiebolag, 'I-Iallefors, Sweden, a company of Sweden Application October 8, 1953, Serial No. 385,034
Claims priority, application Sweden October 10, 1952 1 Claim. (Cl. 29-423) In the production of hollow rock drill steel it is already known, after boring the blank which is to be rolled to form such rock drill steel, to insert a steel core of suitable composition in the cavity. The core is welded to the blank or is held in position due to the fact that it is curved. By this method a space of 1-2 mms. is left between the core and the wall of the cavity of the steel blank. This results in the formation of scales and folds on the wall of the cavity during the rolling.
If the core is upset in such a manner that it completely fills up the cavity in the blank, which is possible by using austenitic core material, advantages as regards quality are gained, for example, entrance of air with formation of glow scales in the zone between the core and the cavity Wall is avoided. Furthermore, the wall of the cavity has appeared to be less inclined to formation of folds during the rolling.
It is also possible to upset the core in such a manner that the core only fills up the ends of the cavity of the blank, which also prevents the formation of glow scales.
The invention is illustrated in the accompanying drawings in which- Fig. 1 is a section on the line II of Fig. 2 showing a cross section of a cylindrical core positioned in a cylindrical cavity in a blank,
Fig. 2 is a vertical section on a plane through the axis of the cylindrical cavity in the blank with the core appearing in elevation,
Fig. 3 is a section similar to that of Fig. 2 after the core has been upset to fill the cavity, and
Fig. 4 is a perspective view of the finished rock drill steel.
nited States Patent 2,768,430 Patented Oct. 30, 1956 Referring to the drawings 1 is the steel blank which is to be rolled to form the drill steel, 2 is the cylindrical cavity extending axially through the blank, 3 is the cylindrical core positioned in the cavity 2 and 4, 4 represent the means for upsetting the core 3 to cause it to tightly fill the cavity 2. As appears in Figs. 1 and 2 the core 3 has been inserted into the cavity 3 but there is a thin space between the surface of the core and the Wall of the cavity. As appears in Fig. 3 the core has been upset or compressed endwise and expanded laterally so that it tightly fills the cavity thereby preventing the entrance of air with the formation of scale and/ or the formation of folds in the wall of the cavity during the rolling operation. In making the drill steel the structure illustrated in Fig. 3 is rolled in the customary manner to reduce its diameter and elongate it to the tubular shape of the drill steel shown in Fig. 4.
Having now described our invention, what we claim as new and desire to secure by Letters Patent is:
A method of producing rock drill steel from a steel blank which comprises boring said blank to provide it with an axial cylindrical cavity, introducing a cylindrical austenitic steel core into said cavity with its ends extending beyond the ends of said blank, upsetting the extending ends of said core by compressing said ends in the longitudinal direction thereby expanding said core laterally until it completely fills said cavity and prevents the entrance of air between the wall of said cavity and the surface of said core and thereby prevents the formation of scales and folds on the wall of said cavity during the subsequent rolling operation, reducing the resulting structure by rolling to convert said blank into a drill steel and finally pulling said core out of said cavity.
References Cited in the file of this patent UNITED STATES PATENTS 1,574,551 Bumford Feb. 23, 1926 1,763,651 Gumaelius June 17, 1930 2,021,945 Payne Nov. 26, 1935 2,300,353 Eberhardt Oct. 27, 1942 2,432,819 Schumacker Dec. 16, 1947 FOREIGN PATENTS 150,562 Great Britain Sept. 9, 1920 325,169 Great Britain Feb. 13, 1930
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE2768430X | 1952-10-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2768430A true US2768430A (en) | 1956-10-30 |
Family
ID=20427203
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US385034A Expired - Lifetime US2768430A (en) | 1952-10-10 | 1953-10-08 | Method of producing hollow rock drill steel |
Country Status (1)
Country | Link |
---|---|
US (1) | US2768430A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3106670A (en) * | 1960-04-21 | 1963-10-08 | Rca Corp | Magnetic field structure for loudspeakers |
US3132980A (en) * | 1957-10-31 | 1964-05-12 | Smiths America Corp | Method of manufacturing non-metallic tubing |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB150562A (en) * | 1919-11-01 | 1920-09-09 | Samuel James Mills | Improvements in the manufacture of hollow metal bars, wires and the like |
US1574551A (en) * | 1921-11-10 | 1926-02-23 | Bumford Edward | Rolling hollow steel |
GB325169A (en) * | 1929-04-29 | 1930-02-13 | Alfred Petter Pehrson | Improvements in or relating to the manufacture of hollow metal rods, bars and the like |
US1763651A (en) * | 1926-10-09 | 1930-06-17 | Fagersta Bruks Ab | Method of manufacturing hollow drill steel |
US2021945A (en) * | 1935-11-26 | Method of making blanks | ||
US2300353A (en) * | 1941-05-31 | 1942-10-27 | Bethlehem Steel Corp | Method of making seamless tubing |
US2432819A (en) * | 1944-09-28 | 1947-12-16 | Indiana Steel Products Co | Method of making composite permanent magnets |
-
1953
- 1953-10-08 US US385034A patent/US2768430A/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2021945A (en) * | 1935-11-26 | Method of making blanks | ||
GB150562A (en) * | 1919-11-01 | 1920-09-09 | Samuel James Mills | Improvements in the manufacture of hollow metal bars, wires and the like |
US1574551A (en) * | 1921-11-10 | 1926-02-23 | Bumford Edward | Rolling hollow steel |
US1763651A (en) * | 1926-10-09 | 1930-06-17 | Fagersta Bruks Ab | Method of manufacturing hollow drill steel |
GB325169A (en) * | 1929-04-29 | 1930-02-13 | Alfred Petter Pehrson | Improvements in or relating to the manufacture of hollow metal rods, bars and the like |
US2300353A (en) * | 1941-05-31 | 1942-10-27 | Bethlehem Steel Corp | Method of making seamless tubing |
US2432819A (en) * | 1944-09-28 | 1947-12-16 | Indiana Steel Products Co | Method of making composite permanent magnets |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3132980A (en) * | 1957-10-31 | 1964-05-12 | Smiths America Corp | Method of manufacturing non-metallic tubing |
US3106670A (en) * | 1960-04-21 | 1963-10-08 | Rca Corp | Magnetic field structure for loudspeakers |
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