US3650163A - Punches - Google Patents
Punches Download PDFInfo
- Publication number
- US3650163A US3650163A US44028A US3650163DA US3650163A US 3650163 A US3650163 A US 3650163A US 44028 A US44028 A US 44028A US 3650163D A US3650163D A US 3650163DA US 3650163 A US3650163 A US 3650163A
- Authority
- US
- United States
- Prior art keywords
- die
- bar
- punch
- chamber
- diameter
- 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
- 229910001315 Tool steel Inorganic materials 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 20
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 208000035389 Ring chromosome 6 syndrome Diseases 0.000 description 1
- 241000282485 Vulpes vulpes Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000012254 powdered material 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
- B21K5/20—Making working faces of dies, either recessed or outstanding
Definitions
- the cavity is provided with a plug having a formed upper sur- [58] Field of Search ..76/107 R; 72/377, 358 face so as to impart a predetermined figu to t ad of the punch, for example, for impressing a signature or other identification into subsequently formed tablets.
- tablets are made by depositing a predetermined quantity of powder into a die and compressing the powder.
- the compressing is usually done by lowering and raising punches under pressure on to the powdered material in the die.
- punches are usually provided with a recessed end portion so that the tablet shall have a domed or bevelled part and the recessed portion of the punch may have some other marking such as an initial letter or name or the like either standing proud or recessed in order to give identification to the tablet.
- the present invention seeks to provide a method for the forming of punches without the need to turn and grind substantial quantities of steel.
- the present invention provides a method of forming a punch especially a punch for use with a Rotary Tablet forming machine comprising, locating a bar of tool steel in a hollow die, said bar being of lesser diameter and longer in length than the final punch, closing the end of said die with a member adapted to slide within said die, applying a force to said member to flow the steel of said bar into the form of said die.
- a bar of steel of substantially the same volume as the finished punch is first obtained, said bar being of lesser diameter and longer in length than the final punch dimensions.
- Such a bar is located in a die, one end of which will be provided with the shape for the end of the punch and will include any marking such as for example letters or names in either relief or recessed form; the die at the other end having a member slidable therein also of appropriately shaped form so that when the bar has been located in the die the member is either pressed by a hydraulic or other press or is hit by a hammer in such a way as to flow the steel of the bar in plastic form into the shape of the die. It is found that four to two blows of 100 ton hammer or 200 tons of hydraulic pressure may be appropriate for flowing cold alloy tool steel of the following compositions Alley I Alloy 2 C 1.00 0.53
- a die body 1 has a hollow die chamber 3.
- a removable plug 2 closes one end of the chamber 3.
- the plug 2 can be provided with a hemispherical portion 9 which itself may have a recessed letter nor a name formed therein.
- a bar of die or punch steel 4 is located within the chamber 3.
- the upper end of the chamber 3 is closed by a ring 5 accurately located in alignment with the die body 1 b a chamfered peripheral ring 6.
- a shaped member 7 is slldab e within a bore formed in the ring 5 and closes the end of the die chamber by applying force to the member 7 until such time as its upper surface is flush with the upper surface of the ring 5.
- the tool steel bar 4 is forced to flow into the form of the hollow die 3 and to flow into the shape formed by a hemispherical portion 9 and by the recessed portion 8 of the member 7.
- the punch may be extracted from the die by pulling portion 5 away from the die body 1.
- Such a punch may be formed with the tool steel cold, or it may be raised to an elevated temperature beneath the dull glowing temperature of the steel.
- a method of cold forming a finished punch comprising the steps of locating a bar of high carbon tool steel in a hollow die, said bar being of a lesser diameter than said die;
- said bar is made of an alloy of a composition consisting of 1.00 c, 0.85 Mn, 0.75 Cp and 0.40 W.
- said bar is made of an alloy of a composition consisting of 0.53 C, 1.80 Cp, 1.90 W and 0.20 V.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Medical Preparation Storing Or Oral Administration Devices (AREA)
Abstract
The tool steel bar which is to form the punch is placed within the oversized cavity of the hollow die and is thereafter deformed under the action of the shaped die slide member. The cavity is provided with a plug having a formed upper surface so as to impart a predetermined configuration to the head of the punch, for example, for impressing a signature or other identification into subsequently formed tablets.
Description
United States Patent Juffs [451 Mar. 21, 1972 [54] PUNCHES [56] References Cited [72] Inventor: Christopher Paul J ufls, Toton, England UNITED STATES PATENTS [73] Assignee: I Holland Limited, Long Eaton, Not- 3,209,453 10/1965 Bertoglio et al... 72/35 8 X tingham, England 3,406,555 10/1968 Fuchs ..72/377 g 2,755,689 7 1 56 db k 22 Filed: June 8, 1970 I 9 ac X [21 1 App]. 44,028 Primary Examiner-Bamard Stickney Attorney-Kenyon & Kenyon Reilly Carr & Chapin [30] Foreign Application Priority Data [57] ABSTRACT June 7, 1969 'Great Britain ..28,9l8/69 The tool steel bar which is to form the punch is placed within the oversized cavity of the hollow die and is thereafter [52] US. Cl. ..76/107 R, 72/358, 72/377 deformed under the action of the shaped die slide member. [51] Int. Cl ..B21k 5/20 The cavity is provided with a plug having a formed upper sur- [58] Field of Search ..76/107 R; 72/377, 358 face so as to impart a predetermined figu to t ad of the punch, for example, for impressing a signature or other identification into subsequently formed tablets.
9 Claims, 1 Drawing Figure PATENTEDMARZI 1912 nv VENTOR CHRIS'TODHEF? PAL/L Jul- 5 PUNCHES This invention is for improvements in or relating to punches and has for one object to provide an improved method for the manufacture of punches with a Head of larger diameter than the body, particularly punches of the kind used in the manufacture of tablets as for example pharmaceutical tablets, and in so doing improving the strength and resistance to abrasive wear to which the Head of this type of punch is subjected in use. I
It will be appreciated that tablets are made by depositing a predetermined quantity of powder into a die and compressing the powder. The compressing is usually done by lowering and raising punches under pressure on to the powdered material in the die. Such punches are usually provided with a recessed end portion so that the tablet shall have a domed or bevelled part and the recessed portion of the punch may have some other marking such as an initial letter or name or the like either standing proud or recessed in order to give identification to the tablet.
The formation of the kind of punch with which the present invention is concerned has previously been by conventional methods as for example by taking a bar of appropriate tool steel, impressing the recessed portion and turning and grinding the bar down to appropriate diameter. This process is time consuming and expensive since tool steel is comparatively expensive and since a comparatively large quantity (55 percent) of the tool steel in original bar form is turned and ground to useless swarf.
The present invention seeks to provide a method for the forming of punches without the need to turn and grind substantial quantities of steel.
Accordingly the present invention provides a method of forming a punch especially a punch for use with a Rotary Tablet forming machine comprising, locating a bar of tool steel in a hollow die, said bar being of lesser diameter and longer in length than the final punch, closing the end of said die with a member adapted to slide within said die, applying a force to said member to flow the steel of said bar into the form of said die.
According to the present invention a bar of steel of substantially the same volume as the finished punch is first obtained, said bar being of lesser diameter and longer in length than the final punch dimensions. Such a bar is located in a die, one end of which will be provided with the shape for the end of the punch and will include any marking such as for example letters or names in either relief or recessed form; the die at the other end having a member slidable therein also of appropriately shaped form so that when the bar has been located in the die the member is either pressed by a hydraulic or other press or is hit by a hammer in such a way as to flow the steel of the bar in plastic form into the shape of the die. It is found that four to two blows of 100 ton hammer or 200 tons of hydraulic pressure may be appropriate for flowing cold alloy tool steel of the following compositions Alley I Alloy 2 C 1.00 0.53
Mn 0.85 Cp 0.75 1.80 W 0.40 1.90
into a punch approximately 13 cm. long and 2 cm. in diameter or 13 cm. long and 3 cm. in diameter.
in order that the present invention may be more readily understood reference is now made to the drawing which illustrates in cross section a die according to the present invention.
In the FIGURE a die body 1 has a hollow die chamber 3. A removable plug 2 closes one end of the chamber 3. The plug 2 can be provided with a hemispherical portion 9 which itself may have a recessed letter nor a name formed therein. A bar of die or punch steel 4 is located within the chamber 3. The upper end of the chamber 3 is closed by a ring 5 accurately located in alignment with the die body 1 b a chamfered peripheral ring 6. A shaped member 7 is slldab e within a bore formed in the ring 5 and closes the end of the die chamber by applying force to the member 7 until such time as its upper surface is flush with the upper surface of the ring 5. The tool steel bar 4 is forced to flow into the form of the hollow die 3 and to flow into the shape formed by a hemispherical portion 9 and by the recessed portion 8 of the member 7. The punch may be extracted from the die by pulling portion 5 away from the die body 1. Such a punch may be formed with the tool steel cold, or it may be raised to an elevated temperature beneath the dull glowing temperature of the steel.
What we claim is:
l. A method of cold forming a finished punch comprising the steps of locating a bar of high carbon tool steel in a hollow die, said bar being of a lesser diameter than said die;
slidably positioning a member in one end of said die to close said end of said die;
applying a force to said member to move said member against said bar to cause said bar to flow into a punch having the form of said die; and
extracting the finished punch from said die.
2. A method according to claim 1 in which the tool end of said die is provided with a shaped form corresponding to the tablet to be formed by said punch when formed.
3. A method according to claim 1 in which the member slidable relative to said die is struck by a hammer.
4. A member according to claim 1 wherein said member slidable relative to said die is acted on by a hydraulic press.
5. In a method of cold forming a finished punch for a rotary tablet forming machine comprising the steps of providing a die body having a hollow die chamber of predetermined diameter;
positioning a removable plug in a lower end of said body to close said chamber;
positioning a ring on the upper end of said body in alignment with said chamber;
locating a bar of high carbon tool steel in said chamber, said bar being of a lesser diameter than said chamber and of a longer length than said chamber;
slidably mounting a shaped member in said ring to close the upper end of said chamber; applying 'a force to said member to move said member against said bar to cause said bar to flow into a finished punch having a diameter equal to said diameter of said chamber and a length less than said length of said bar; and
pulling said ring from said body to extract said finished punch from said die chamber.
6. A method as set forth in claim 1 wherein said plug has a surface facing said bar of a predetermined shape corresponding to a tablet to be formed by said punch.
7. A method as set forth in claim 1 wherein said bar is made of an alloy of a composition consisting of 1.00 c, 0.85 Mn, 0.75 Cp and 0.40 W.
8. A method as set forth in claim 1 wherein said bar is made of an alloy of a composition consisting of 0.53 C, 1.80 Cp, 1.90 W and 0.20 V.
9. A punch made in accordance with the method of claim 1.
Claims (9)
1. A method of cold forming a finished punch comprising the steps of locating a bar of high carbon tool steel in a hollow die, said bar being of a lesser diameter than said die; slidably positioning a member in one end of said die to close said end of said die; applying a force to said member to move said member against said bar to cause said bar to flow into a punch having the form of said die; and extracting the finished punch from said die.
2. A method according to claim 1 in which the tool end of said die is provided with a shaped form corresponding to the tablet to be formed by said punch when formed.
3. A method according to claim 1 in which the member slidable relative to said die is struck by a hammer.
4. A member according to claim 1 wherein said member slidable relative to said die is acted on by a hydraulic press.
5. In a method of cold forming a finished punch for a rotary tablet forming machine comprising the steps of providing a die body having a hollow die chamber of predetermined diameter; positioning a removable plug in a lower end of said body to close said chamber; positioning a ring on the upper end of said body in alignment with said chamber; locating a bar of high carbon tool steel in said chamber, said bar being of a lesser diameter than said chamber and of a longer length than said chamber; slidably mounting a shaped member in said ring to close the upper end of said chamber; applying a force to said member to move said member against said bar to cause said bar to flow into a finished punch having a diameter equal to said diameter of said chamber and a length less than said length of said bar; and pulling said ring from said body to extract said finished punch from said die chamber.
6. A method as set forth in claim 1 wherein said plug has a surface facing said bar of a predetermined shape corresponding to a tablet to be formed by said punch.
7. A method as set forth in claim 1 wherein said bar is made of an alloy of a composition consisting of 1.00 c, 0.85 Mn, 0.75 Cp and 0.40 W.
8. A method as set forth in claim 1 wherein said bar is made of an alloy of a composition consisting of 0.53 C, 1.80 Cp, 1.90 W and 0.20 V.
9. A punch made in accordance with the method of claim 1.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB28918/69A GB1274464A (en) | 1969-06-07 | 1969-06-07 | Improvements in or relating to methods of forming punches |
Publications (1)
Publication Number | Publication Date |
---|---|
US3650163A true US3650163A (en) | 1972-03-21 |
Family
ID=10283302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US44028A Expired - Lifetime US3650163A (en) | 1969-06-07 | 1970-06-08 | Punches |
Country Status (2)
Country | Link |
---|---|
US (1) | US3650163A (en) |
GB (1) | GB1274464A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4241598A (en) * | 1978-10-16 | 1980-12-30 | Sack & Kiesselbach Maschinenfabrik Gmbh | Method for producing a cross-slotted heading die |
US5001822A (en) * | 1989-11-30 | 1991-03-26 | Robert Upthegrove | Multi-segment punch assembly |
EP1604751A1 (en) * | 2004-06-09 | 2005-12-14 | Groz-Beckert KG | Punching device and punch therefor |
US20060048559A1 (en) * | 2004-09-07 | 2006-03-09 | Chien-Chuan Huang | Method for making punch head of paper punch |
US20080229893A1 (en) * | 2007-03-23 | 2008-09-25 | Dayton Progress Corporation | Tools with a thermo-mechanically modified working region and methods of forming such tools |
US20090229417A1 (en) * | 2007-03-23 | 2009-09-17 | Dayton Progress Corporation | Methods of thermo-mechanically processing tool steel and tools made from thermo-mechanically processed tool steels |
CN101767174A (en) * | 2010-02-25 | 2010-07-07 | 无锡透平叶片有限公司 | Loose tooling upsetting device of continuous upsetting heads at both ends of long rod material |
US20140373593A1 (en) * | 2012-01-23 | 2014-12-25 | Hitachi Metals, Ltd. | Hot upset forging method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2755689A (en) * | 1951-07-19 | 1956-07-24 | Paul P Sundback | Method of hobbing steels |
US3209453A (en) * | 1960-06-22 | 1965-10-05 | Real Patentauswertungs Anstalt | Process for the cold rough shaping of ball pen points |
US3406555A (en) * | 1966-04-05 | 1968-10-22 | Western Electric Co | Cold forming of articles |
-
1969
- 1969-06-07 GB GB28918/69A patent/GB1274464A/en not_active Expired
-
1970
- 1970-06-08 US US44028A patent/US3650163A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2755689A (en) * | 1951-07-19 | 1956-07-24 | Paul P Sundback | Method of hobbing steels |
US3209453A (en) * | 1960-06-22 | 1965-10-05 | Real Patentauswertungs Anstalt | Process for the cold rough shaping of ball pen points |
US3406555A (en) * | 1966-04-05 | 1968-10-22 | Western Electric Co | Cold forming of articles |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4241598A (en) * | 1978-10-16 | 1980-12-30 | Sack & Kiesselbach Maschinenfabrik Gmbh | Method for producing a cross-slotted heading die |
US5001822A (en) * | 1989-11-30 | 1991-03-26 | Robert Upthegrove | Multi-segment punch assembly |
US7578224B2 (en) | 2004-06-09 | 2009-08-25 | Groz-Beckert Kg | Punching device and punching die for it |
US20050274251A1 (en) * | 2004-06-09 | 2005-12-15 | Groz-Beckert Kg | Punching device and punching die for it |
EP1604751A1 (en) * | 2004-06-09 | 2005-12-14 | Groz-Beckert KG | Punching device and punch therefor |
US20060048559A1 (en) * | 2004-09-07 | 2006-03-09 | Chien-Chuan Huang | Method for making punch head of paper punch |
US20080229893A1 (en) * | 2007-03-23 | 2008-09-25 | Dayton Progress Corporation | Tools with a thermo-mechanically modified working region and methods of forming such tools |
US20090229417A1 (en) * | 2007-03-23 | 2009-09-17 | Dayton Progress Corporation | Methods of thermo-mechanically processing tool steel and tools made from thermo-mechanically processed tool steels |
US8968495B2 (en) | 2007-03-23 | 2015-03-03 | Dayton Progress Corporation | Methods of thermo-mechanically processing tool steel and tools made from thermo-mechanically processed tool steels |
US9132567B2 (en) | 2007-03-23 | 2015-09-15 | Dayton Progress Corporation | Tools with a thermo-mechanically modified working region and methods of forming such tools |
CN101767174A (en) * | 2010-02-25 | 2010-07-07 | 无锡透平叶片有限公司 | Loose tooling upsetting device of continuous upsetting heads at both ends of long rod material |
US20140373593A1 (en) * | 2012-01-23 | 2014-12-25 | Hitachi Metals, Ltd. | Hot upset forging method |
US9427793B2 (en) * | 2012-01-23 | 2016-08-30 | Hitachi Metals, Ltd. | Hot upset forging method |
Also Published As
Publication number | Publication date |
---|---|
GB1274464A (en) | 1972-05-17 |
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