EP0734799B1 - Die unit for punching operations - Google Patents
Die unit for punching operations Download PDFInfo
- Publication number
- EP0734799B1 EP0734799B1 EP19960400662 EP96400662A EP0734799B1 EP 0734799 B1 EP0734799 B1 EP 0734799B1 EP 19960400662 EP19960400662 EP 19960400662 EP 96400662 A EP96400662 A EP 96400662A EP 0734799 B1 EP0734799 B1 EP 0734799B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- die
- die body
- surface portion
- auxiliary
- unit
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/34—Perforating tools; Die holders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
Definitions
- the present invention relates to a die unit for performing punching operations on a workpiece in cooperation with a punch unit, and a method of extending the working life thereof.
- a conventional die unit 101 has a die body 103 formed with a die hole 105 passing vertically through a substantially center portion thereof.
- the punch unit 107 When a punching is performed on a metal workpiece W with the die unit 101 and a punch unit 107, the punch unit 107 is descended after the workpiece W is placed on an upper surface of the die body 103. Thus, the workpiece W is held between a punch guide 109 and the die body 103 and supported thereby.
- a punch body 111 is further descended and a punching is performed on the workpiece W in cooperation with the die body 103, a refuse WA removed from the workpiece W is dropped off downwardly through the die hole 105.
- a burr B1 is formed under the workpiece W as shown in Fig. 2A. If this burr B1 is left as it is, the burr B1 may constitute a hindrance to the following processing. Therefore, a burr removing process for removing the burr B1 is performed, for example, by grinding tools. However, when the burr removing process is performed to remove the bur B1, a secondary burr B2 extending in the horizontal direction as shown in Fig. 2B may be formed in the workpiece W. Accordingly, there was a problem that the burr formed during punching operations could not completely be removed and constituted a hindrance to the following processing as it used to be. Further prior art is disclosed in JP-A-63101029, which illustrates the combination of features specified in the preamble of claim 1.
- an object of the present invention to provide a die unit for performing punching operations on a workpiece in cooperation with a punch unit without producing a burr on the lower surface of the workpiece, and thereby the burr removing operations are no longer necessary.
- Fig. 1 is an explanatory view illustrating a punching operation by conventional punch unit and die unit.
- Fig. 2 A is cross-sectional view illustrating a workpiece formed with a burr resulting from a punching operation by the conventional punch and die units
- Fig. 2B is a cross-sectional view illustrating a workpiece resulting from a burr removing operation on the workpiece of Fig. 2A.
- Fig. 3 is a cross-sectional view illustrating a further die unit.
- Fig. 4 is an explanatory view illustrating a punching operation with the die unit according to Fig 3.
- Fig. 5 is a cross-sectional view illustrating a workpiece processed by the punch unit and die unit according to Fig. 3.
- Fig. 6 is a cross-sectional view of an embodiment of the die unit according to the present invention.
- Fig. 7 is an explanatory view illustrating a punching operation on a workpiece by the punch unit and die unit according to the embodiment.
- a die unit is composed of a die body 3.
- a die hole 5 passing vertically is formed in a substantially center portion of this die body 3.
- a projecting portion 11 slightly protruding upward relative to an upper surface 7 of the die body 3 is formed.
- the projecting portion 11 has a horizontal surface 9.
- Fig. 4 illustrates a punching operation performed on a workpiece W with the die unit 1.
- a punch guide 15 of a punch unit 13 is descended.
- the workpiece W is held between the punch guide 15 and the die body 3 and supported thereby.
- a punch body 17 is further descended and the workpiece W is punched by the engagement of the punch body 17 with the die body 3
- a refuse WA is cut out from the workpiece W and a hole Wa is formed in the workpiece W.
- a chamfering portion (or a recessed portion) M recessed upwardly is formed along the perimeter of the hole Wa with the projecting portion 9,. Accordingly, a burr B formed in the chamfering portion M does not project outwardly of a lower surface of the workpiece W. Since such burr B does not constitute a hindrance to the following processing, it is unnecessary to be removed.
- the chamfering portion M is formed in the workpiece so that the burr B is prevented from projecting below the lower surface of the workpiece W. Therefore burr removing operations are no longer necessary. Further, since the chamfering portion is formed during the punching operation, the operation is quick and simple.
- the height H of the protruding portion 11 is equal to 0.2 to 0.5mm, and the width A of the horizontal surface 9 is equal to 0.1 to 0.2mm.
- the chamfering operation can be favorably performed in a workpiece. That is, the burr B is located well inside the chamfering portion M; in other words, the burr B is surely prevented from protruding downward from the lower surface of the workpiece W.
- the outside surface of the protruding portion 11 is inclined relative to the vertical axis of the die body 3, but it may be parallel to the vertical axis. Further, a cross-sectional shape of the die hole 5 in a horizontal direction may be circular, rectangular or the like.
- FIG. 6 illustrates an embodiment 201 of the die unit according to the present invention.
- a die unit 201 of the second embodiment includes a die body 203 and an auxiliary cap 221.
- the die body 203 is formed with a die hole 205 passing vertically through a substantially center portion thereof.
- a conical surface portion 219 spreading outwards downwardly is further formed on the outer peripheral surface thereof, and a ridge portion 209 is formed at the upper portion 211 of the die body 203.
- the ridge portion 209 is preferably formed with a horizontal plane surface.
- the auxiliary cap 221 is detachably provided on the die body 203.
- a hole 231 having conical shaped portion corresponding to the conical surface portion 219 is formed in the auxiliary cap 221 and the auxiliary cap 221 is provided on the die body 203 so that the conical shaped portion of the hole 231 engages with the conical surface portion 219.
- the ridge portion 209 is designed to slightly protrude upward above an upper surface 223 of the auxiliary cap 221.
- the auxiliary cap 221 may be fixed to the die body 203 by suitable means.
- Fig. 7 illustrates the manner in which a workpiece W is processed by the punch unit 13 and the die unit 201 according to the second embodiment.
- the die unit 201 of the embodiment has the same function as the die unit 101 of Figures 3 to 5. That is to say, as illustrated in Fig. 5, the chamfering portion (or the recess portion) M is formed along the perimeter of the hole Wa on a lower surface of the workpiece by the punching operation. Therefore the burr B formed along the perimeter of the punch hole Wa is located inside the chamfering portion (or the recessed portion) so as not to project downwardly below the lower surface of the workpiece W. Accordingly, burr removing operations after punching operations are no longer necessary.
- the auxiliary cap 221 when the ridge portion 209 of the die body 203 is worn away by punching operations, the auxiliary cap 221 is detached from the die body 203, and the inclined portion 219 is ground so that a new surface is parallel to the original surface.
- the new ridge portion 209 projects upwardly by a suitable amount above the upper surface 223 of the auxiliary cap 221. Grinding of the inclined portion 219 can be performed several times until the height of the vertical portion 203a of the body 203 becomes zero. Accordingly, the grinding operations can be repeatedly performed, whereby the life of the die is extended.
- the height of the vertical portion 203a of the body 203 eventually becomes shorter than that of a vertical portion 231b of the hole 231 in the auxiliary cap 221.
- an auxiliary member may be interposed between the die body 203 and a die holder of a punching press.
- the projecting height H of the ridge portion 209 relative to the upper surface 223 is equal to 0.2 to 0.5mm and the width A of the horizontal plane surface of the ridge portion 209 is equal to 0.1 to 0.2mm.
- the horizontal cross-sectional shape of the die hole 205 may be circular, rectangular or the like.
- the auxiliary cap 221 is made of a metal and preferably of the same metal as the die body 203.
- the ridge portion projecting upwardly above the upper surface of the die body or auxiliary cap is provided in the upper peripheral portion of the die hole. Therefore, when a punching is performed on a workpiece, the chamfering portion is formed along the perimeter of the punched hole. Accordingly, the burr B produced around the punched hole Wa is located inside the chamfering portion so as not to project downwardly below the lower surface of the workpiece W. Accordingly, burr removing operations after punching operations are no longer necessary.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Punching Or Piercing (AREA)
Description
- The present invention relates to a die unit for performing punching operations on a workpiece in cooperation with a punch unit, and a method of extending the working life thereof.
- As shown in Fig. 1, a
conventional die unit 101 has adie body 103 formed with adie hole 105 passing vertically through a substantially center portion thereof. - When a punching is performed on a metal workpiece W with the
die unit 101 and apunch unit 107, thepunch unit 107 is descended after the workpiece W is placed on an upper surface of thedie body 103. Thus, the workpiece W is held between apunch guide 109 and the diebody 103 and supported thereby. When apunch body 111 is further descended and a punching is performed on the workpiece W in cooperation with thedie body 103, a refuse WA removed from the workpiece W is dropped off downwardly through thedie hole 105. - When the punching is performed by the above-mentioned
conventional punch unit 107 anddie unit 101, a burr B1 is formed under the workpiece W as shown in Fig. 2A. If this burr B1 is left as it is, the burr B1 may constitute a hindrance to the following processing. Therefore, a burr removing process for removing the burr B1 is performed, for example, by grinding tools. However, when the burr removing process is performed to remove the bur B1, a secondary burr B2 extending in the horizontal direction as shown in Fig. 2B may be formed in the workpiece W. Accordingly, there was a problem that the burr formed during punching operations could not completely be removed and constituted a hindrance to the following processing as it used to be. Further prior art is disclosed in JP-A-63101029, which illustrates the combination of features specified in the preamble ofclaim 1. - It is, therefore, an object of the present invention to provide a die unit for performing punching operations on a workpiece in cooperation with a punch unit without producing a burr on the lower surface of the workpiece, and thereby the burr removing operations are no longer necessary.
- This object is achieved by the die unit according to
claim 1. - In this die unit, when the ridge portion having the horizontal plane portion is worn away during punching operations, the auxiliary cap is detached from the die body and the inclined portion is ground parallel to an original surface. Thus when the auxiliary cap is attached to the die body once more, the ridge portion again projects upwardly of the upper surface of the auxiliary cap by a desirable amount, and the life of the die unit is extended.
- Fig. 1 is an explanatory view illustrating a punching operation by conventional punch unit and die unit.
- Fig. 2 A is cross-sectional view illustrating a workpiece formed with a burr resulting from a punching operation by the conventional punch and die units, and Fig. 2B is a cross-sectional view illustrating a workpiece resulting from a burr removing operation on the workpiece of Fig. 2A.
- Fig. 3 is a cross-sectional view illustrating a further die unit.
- Fig. 4 is an explanatory view illustrating a punching operation with the die unit according to Fig 3.
- Fig. 5 is a cross-sectional view illustrating a workpiece processed by the punch unit and die unit according to Fig. 3.
- Fig. 6 is a cross-sectional view of an embodiment of the die unit according to the present invention.
- Fig. 7 is an explanatory view illustrating a punching operation on a workpiece by the punch unit and die unit according to the embodiment.
- Hereinafter, a preferred embodiment, according to the present invention, will be described in detail with reference to the accompanying drawings. The examples according to Figures 3 to 5 serve to aid understanding, but do not relate to claimed subject-matter.
- Referring to Fig. 3, a die unit is composed of a die
body 3. A diehole 5 passing vertically is formed in a substantially center portion of thisdie body 3. In an upper peripheral portion of thisdie hole 5, a projectingportion 11 slightly protruding upward relative to anupper surface 7 of thedie body 3 is formed. The projectingportion 11 has a horizontal surface 9. - Fig. 4 illustrates a punching operation performed on a workpiece W with the
die unit 1. After the workpiece W is placed on theupper surface 7 of the die body 8 and the horizontal surface 9 of the projectingportion 11, apunch guide 15 of apunch unit 13 is descended. Then, the workpiece W is held between thepunch guide 15 and thedie body 3 and supported thereby. Next, when apunch body 17 is further descended and the workpiece W is punched by the engagement of thepunch body 17 with thedie body 3, a refuse WA is cut out from the workpiece W and a hole Wa is formed in the workpiece W. - As shown in Fig. 5, a chamfering portion (or a recessed portion) M recessed upwardly is formed along the perimeter of the hole Wa with the projecting portion 9,. Accordingly, a burr B formed in the chamfering portion M does not project outwardly of a lower surface of the workpiece W. Since such burr B does not constitute a hindrance to the following processing, it is unnecessary to be removed.
- In this way, with the die unit of Figures 3 to 5, the chamfering portion M is formed in the workpiece so that the burr B is prevented from projecting below the lower surface of the workpiece W. Therefore burr removing operations are no longer necessary. Further, since the chamfering portion is formed during the punching operation, the operation is quick and simple.
- It is preferable that the height H of the protruding
portion 11 is equal to 0.2 to 0.5mm, and the width A of the horizontal surface 9 is equal to 0.1 to 0.2mm. With the die having such dimensions, the chamfering operation can be favorably performed in a workpiece. That is, the burr B is located well inside the chamfering portion M; in other words, the burr B is surely prevented from protruding downward from the lower surface of the workpiece W. - In Fig. 3, the outside surface of the
protruding portion 11 is inclined relative to the vertical axis of thedie body 3, but it may be parallel to the vertical axis. Further, a cross-sectional shape of thedie hole 5 in a horizontal direction may be circular, rectangular or the like. - Fig. 6 illustrates an
embodiment 201 of the die unit according to the present invention. A dieunit 201 of the second embodiment includes a diebody 203 and anauxiliary cap 221. The diebody 203 is formed with adie hole 205 passing vertically through a substantially center portion thereof. Aconical surface portion 219 spreading outwards downwardly is further formed on the outer peripheral surface thereof, and aridge portion 209 is formed at theupper portion 211 of thedie body 203. Theridge portion 209 is preferably formed with a horizontal plane surface. - The
auxiliary cap 221 is detachably provided on the diebody 203. In more detail, ahole 231 having conical shaped portion corresponding to theconical surface portion 219 is formed in theauxiliary cap 221 and theauxiliary cap 221 is provided on thedie body 203 so that the conical shaped portion of thehole 231 engages with theconical surface portion 219. As illustrated in Fig. 6, theridge portion 209 is designed to slightly protrude upward above anupper surface 223 of theauxiliary cap 221. Theauxiliary cap 221 may be fixed to the diebody 203 by suitable means. - Fig. 7 illustrates the manner in which a workpiece W is processed by the
punch unit 13 and thedie unit 201 according to the second embodiment. After the workpiece W is placed on theupper surface 223 of theauxiliary cap 219 and thehorizontal portion 209 of thebody 203, thepunch guide 15 of thepunch unit 13 is descended to hold the workpiece W downwardly. Next, when thepunch body 17 is further descended and the workpiece W is punched with the engagement of thepunch body 17 with thedie body 203, a refuse WA is cut out from the workpiece W and falls downward through thedie hole 205. - The die
unit 201 of the embodiment has the same function as the dieunit 101 of Figures 3 to 5. That is to say, as illustrated in Fig. 5, the chamfering portion (or the recess portion) M is formed along the perimeter of the hole Wa on a lower surface of the workpiece by the punching operation. Therefore the burr B formed along the perimeter of the punch hole Wa is located inside the chamfering portion (or the recessed portion) so as not to project downwardly below the lower surface of the workpiece W. Accordingly, burr removing operations after punching operations are no longer necessary. - Furthermore, in the die
unit 201 of the embodiment, when theridge portion 209 of thedie body 203 is worn away by punching operations, theauxiliary cap 221 is detached from thedie body 203, and theinclined portion 219 is ground so that a new surface is parallel to the original surface. Thus, when theauxiliary cap 221 is again attached to thebody 203, thenew ridge portion 209 projects upwardly by a suitable amount above theupper surface 223 of theauxiliary cap 221. Grinding of theinclined portion 219 can be performed several times until the height of thevertical portion 203a of thebody 203 becomes zero. Accordingly, the grinding operations can be repeatedly performed, whereby the life of the die is extended. In this connection, when the grinding operations are repeatedly performed, the height of thevertical portion 203a of thebody 203 eventually becomes shorter than that of avertical portion 231b of thehole 231 in theauxiliary cap 221. At this time, when thedie 201 is attached to a punching press, an auxiliary member may be interposed between thedie body 203 and a die holder of a punching press. - It is preferable that the projecting height H of the
ridge portion 209 relative to theupper surface 223 is equal to 0.2 to 0.5mm and the width A of the horizontal plane surface of theridge portion 209 is equal to 0.1 to 0.2mm. The horizontal cross-sectional shape of thedie hole 205 may be circular, rectangular or the like. Theauxiliary cap 221 is made of a metal and preferably of the same metal as thedie body 203. - As is understood from the foregoing description, in the die unit of the present invention, the ridge portion projecting upwardly above the upper surface of the die body or auxiliary cap is provided in the upper peripheral portion of the die hole. Therefore, when a punching is performed on a workpiece, the chamfering portion is formed along the perimeter of the punched hole. Accordingly, the burr B produced around the punched hole Wa is located inside the chamfering portion so as not to project downwardly below the lower surface of the workpiece W. Accordingly, burr removing operations after punching operations are no longer necessary.
Claims (5)
- A die unit for performing punching operations in cooperation with a punch unit (13) that includes a punch body (17) comprising:a die body (203) formed at its substantially center portion with a die hole (205) extending in an axial direction for receiving a cutting edge of the punch body (17), on its outer peripheral surface with an inclined surface portion (219) spreading outwards downwardly, and at its upper portion with a ridge portion (209); andan auxiliary member (221) detachably fitted on the die body (203), the auxiliary member (221) being formed with a hole portion (231) engaging with said inclined portion (219) of the die body (203), and with an upper surface portion (223) extending in a plane normal to the axial direction so as to support a workpiece during the punching operations; wherein the auxiliary member (221) is so designed that the ridge portion (209) projects upwardly above the upper surface portion (223) of the auxiliary member (221) when the auxiliary member (221) is fitted on the die body (203),
- The die unit as recited in Claim 1, wherein the ridge portion (209) is formed in a wedge-shape in cross-section.
- The die unit as recited in Claim 1, wherein the ridge portion (209) is formed with a horizontal plane surface extending substantially parallel to the upper surface portion (223) of the auxiliary cap member (221).
- The die unit as recited in Claim 3, wherein the height of the ridge portion (209) above the upper surface portion (223) of the auxiliary cap member (221) is between 0.2 and 0.5mm, and the width of the horizontal plane surface of the ridge portion (209) is between 0.1 and 0.2mm.
- A method of extending the working life of a die unit according to claim 1 said method comprising:(a) detaching the auxiliary cap member (221) from the die body (203) when the ridge portion (209) of the die unit is worn away by punching operations;(b) grinding the inclined surface portion (219) of the die body (203) to form a new inclined surface portion that is parallel to the old inclined surface portion; and(c) attaching the auxiliary cap member (221) to the ground die body (203).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6947095 | 1995-03-28 | ||
JP6947095A JPH08267158A (en) | 1995-03-28 | 1995-03-28 | Die |
JP69470/95 | 1995-03-28 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0734799A2 EP0734799A2 (en) | 1996-10-02 |
EP0734799A3 EP0734799A3 (en) | 1997-04-16 |
EP0734799B1 true EP0734799B1 (en) | 2001-06-13 |
Family
ID=13403598
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19960400662 Expired - Lifetime EP0734799B1 (en) | 1995-03-28 | 1996-03-28 | Die unit for punching operations |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0734799B1 (en) |
JP (1) | JPH08267158A (en) |
DE (1) | DE69613261T2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2610019A1 (en) | 2011-12-28 | 2013-07-03 | TRUMPF Werkzeugmaschinen GmbH + Co. KG | Tool die for a tool unit |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002018793A (en) * | 2000-06-30 | 2002-01-22 | Elna Co Ltd | Punching method for printed wiring board and printed wiring board |
JP5732230B2 (en) * | 2010-11-01 | 2015-06-10 | ユニプレス株式会社 | Punching method and mold |
JP2014050889A (en) * | 2013-10-18 | 2014-03-20 | Unipres Corp | Clutch drum for automobile transmission |
JP2019063845A (en) * | 2017-10-04 | 2019-04-25 | トヨタ自動車株式会社 | Rotor core manufacturing method |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1169404B (en) * | 1959-09-02 | 1964-05-06 | Kienzle Apparate Gmbh | Tool for punching sheet metal |
JPS61195719A (en) * | 1985-02-25 | 1986-08-30 | Matsushita Electric Works Ltd | Production of punched product |
JPS6272438A (en) * | 1985-09-25 | 1987-04-03 | Hitachi Ltd | Working device for punching plate material |
JPS63101029A (en) * | 1986-10-17 | 1988-05-06 | Takiron Co Ltd | Manufacture of punching plate |
JPH03275224A (en) * | 1990-03-23 | 1991-12-05 | Hitachi Cable Ltd | Method for blanking lead frame by progressive dies |
-
1995
- 1995-03-28 JP JP6947095A patent/JPH08267158A/en active Pending
-
1996
- 1996-03-28 EP EP19960400662 patent/EP0734799B1/en not_active Expired - Lifetime
- 1996-03-28 DE DE1996613261 patent/DE69613261T2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2610019A1 (en) | 2011-12-28 | 2013-07-03 | TRUMPF Werkzeugmaschinen GmbH + Co. KG | Tool die for a tool unit |
WO2013098154A1 (en) | 2011-12-28 | 2013-07-04 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Tool die for a tool unit |
Also Published As
Publication number | Publication date |
---|---|
DE69613261D1 (en) | 2001-07-19 |
EP0734799A3 (en) | 1997-04-16 |
EP0734799A2 (en) | 1996-10-02 |
DE69613261T2 (en) | 2002-06-13 |
JPH08267158A (en) | 1996-10-15 |
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