GB557210A - Improvements in or relating to a method of forging and refinishing detachable drill bits and the like and apparatus therefor - Google Patents
Improvements in or relating to a method of forging and refinishing detachable drill bits and the like and apparatus thereforInfo
- Publication number
- GB557210A GB557210A GB3504/42A GB350442A GB557210A GB 557210 A GB557210 A GB 557210A GB 3504/42 A GB3504/42 A GB 3504/42A GB 350442 A GB350442 A GB 350442A GB 557210 A GB557210 A GB 557210A
- Authority
- GB
- United Kingdom
- Prior art keywords
- inserts
- dolly
- bar
- forging
- grooves
- 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
- 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
- B21K5/06—Dressing, e.g. sharpening rock drills
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
557,210. Forging bits for rock drills. BOYCE, G. E. March 17, 1942, No. 3504. Convention date, July 22, 1941. [Classes 83 (ii) and 83 (iv)] Detachable bits for rock drills having sludge grooves 20, Fig. 6, are forged from heated barstock C introduced between two part dies 10, 11 to an extent limited by the pin 20a of the dolly which acts as a gauging stop at this stage. Inserts 14, 15 with cutting edges 17 that almost sever the bit from the bar, from the dovetail tongue and have flanking inserts 15a all retained in position, by main die inserts 12, 13 that have recesses or grooves extending over more than a semi-cylinder to receive and retain hardened pins 21 that form the grooves 20. All the die inserts are retained by inturned flanges on front plates. After the side dies have closed on the bar the dolly D is opened to upset the metal into the die cavity the size being determined when surfaces on the dolly and inserts come into contact. The completely forged bit is taken off from the bar and the central water passage is drilled the pin 20a having formed a pilot hole for this purpose.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA557210X | 1941-07-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB557210A true GB557210A (en) | 1943-11-10 |
Family
ID=4171791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3504/42A Expired GB557210A (en) | 1941-07-22 | 1942-03-17 | Improvements in or relating to a method of forging and refinishing detachable drill bits and the like and apparatus therefor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB557210A (en) |
-
1942
- 1942-03-17 GB GB3504/42A patent/GB557210A/en not_active Expired
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