US167766A - Improvement in processes of manufacturing twist-drills - Google Patents
Improvement in processes of manufacturing twist-drills Download PDFInfo
- Publication number
- US167766A US167766A US167766DA US167766A US 167766 A US167766 A US 167766A US 167766D A US167766D A US 167766DA US 167766 A US167766 A US 167766A
- Authority
- US
- United States
- Prior art keywords
- drills
- improvement
- twist
- processes
- drill
- 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
- 238000000034 method Methods 0.000 title description 12
- 238000004519 manufacturing process Methods 0.000 title description 8
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 239000000835 fiber Substances 0.000 description 4
- 238000005242 forging Methods 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- 210000000088 Lip Anatomy 0.000 description 2
- 241000242541 Trematoda Species 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
Definitions
- VVZI/nesses Inventon N. PETERS. FNOTO-LITHOGRAPHER. WASHXNGTON, D C.
- Figure l of the drawings is a representation of a side view of the bar of steel after the first process of hammering.
- Fig. 2 is an end view of the same.
- Fig. 3 shows the finished and twisted drill.
- Fig. at shows an end view of the same.
- This invention has relation to drills; and the novelty consists in the manufacture of a twist-drill, as will be hereinafter more fully set forth.
- a represents a bar of steel, forged, swaged, or hammered to the required size, producing two concave and two convex faces in the length I thereof.
- Figs. 3 and 4. The twisted drill is then again hammered or forged.
- the cuttinglips 11 b are made with a slight curve, as shown .in Fig. 4, for the purpose of narrowing the chips as they are being cut, so that they will be readily ejected and less liable to clog the flukes or grooves when deep holes are being drilled.
- the drill is tempered equally throughout its length before and after the hammering or swagingf
- the steel in its natural state has no grain or fiber.
- the object sought in forging or hammering and twisting a steel bar is to preserve the full crystalline strength of the steel, the process only modifying the form of the crystals and their arrangement, not impairing their power of resistance, as in the case where the spiral fluting is produced by cutting away the metal.
- twist-drill consisting in tempering the blank, then forging or hammering it into the form of two straight grooves with a curve at top and bottom, then twisting it while hot, and again hammering and tempering it, substantially as described.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Description
c. B.nunT.
' Process of Manufacturing Twist-Drills. No, 167,766, Patented Septa 14,1875.
Fig 1.
Fig 2.
VVZI/nesses; Inventon N. PETERS. FNOTO-LITHOGRAPHER. WASHXNGTON, D C.
UNITED STATES PATENT OFFICE.
CHARLES B. HUNT, OF SPRINGVI LLE, PENNSYLVANIA.
IMPROVEMENT IN PROCESSES bF MANUFACTURING TWIST-DRILLS.
Specification forming part of Letters Patent No. 167,766, dated September 14, 1875; application filed May 1, 1875.
To all whom it may concern Be it known that 1, CHARLES B. HUNT, of Springville, in the county of Susquehanna and State of Pennsylvania, have invented a new and valuable Improvement in Twist-Drills; and 1 do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.
Figure l of the drawings is a representation of a side view of the bar of steel after the first process of hammering. Fig. 2 is an end view of the same. Fig. 3 shows the finished and twisted drill. Fig. at shows an end view of the same.
This invention has relation to drills; and the novelty consists in the manufacture of a twist-drill, as will be hereinafter more fully set forth.
In the accompanying drawings, a represents a bar of steel, forged, swaged, or hammered to the required size, producing two concave and two convex faces in the length I thereof.
By swaging or hammering the steel bar, it becomes firm and solid in the central part, or that portion of the drill that should be the strongest.
When the steel bar is fully hammered or swaged into the required form, as shown in Figs. 1 and 2, it is then twisted while hot with a regular and even twist, and terminating with a curved lip or cutting-edge, b, as
shown in Figs. 3 and 4. The twisted drill is then again hammered or forged. The cuttinglips 11 b are made with a slight curve, as shown .in Fig. 4, for the purpose of narrowing the chips as they are being cut, so that they will be readily ejected and less liable to clog the flukes or grooves when deep holes are being drilled.
The drill is tempered equally throughout its length before and after the hammering or swagingf The steel in its natural state has no grain or fiber. By twisting the bar while hot the grain or fiber, which follows the curve of the grooves, greatly increases the strength, smoothness, and durability of the drill.
The object sought in forging or hammering and twisting a steel bar is to preserve the full crystalline strength of the steel, the process only modifying the form of the crystals and their arrangement, not impairing their power of resistance, as in the case where the spiral fluting is produced by cutting away the metal.
What I claim as my invention, and desire to secure by Letters Patent, is-
The process of forming a twist-drill consisting in tempering the blank, then forging or hammering it into the form of two straight grooves with a curve at top and bottom, then twisting it while hot, and again hammering and tempering it, substantially as described.
CHARLES BROWN HUNT.
Witnesses:
J. M. TOLLMAN, J. B. PEL'roN.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US167766A true US167766A (en) | 1875-09-14 |
Family
ID=2237175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US167766D Expired - Lifetime US167766A (en) | Improvement in processes of manufacturing twist-drills |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US167766A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3102060A (en) * | 1958-12-15 | 1963-08-27 | Schoch Ag Ernst | Method for the mechanical twisting of cold-formed profile steels |
| US4209275A (en) * | 1978-10-30 | 1980-06-24 | Kim Joo B | Twist drill |
-
0
- US US167766D patent/US167766A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3102060A (en) * | 1958-12-15 | 1963-08-27 | Schoch Ag Ernst | Method for the mechanical twisting of cold-formed profile steels |
| US4209275A (en) * | 1978-10-30 | 1980-06-24 | Kim Joo B | Twist drill |
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