US3640167A - Punching apparatus - Google Patents

Punching apparatus Download PDF

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Publication number
US3640167A
US3640167A US3640167DA US3640167A US 3640167 A US3640167 A US 3640167A US 3640167D A US3640167D A US 3640167DA US 3640167 A US3640167 A US 3640167A
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Prior art keywords
piston
punching
cylinder housing
matrix
operatively
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Adam Axtmann
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Maschinenfabrik Lorenz AG
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Maschinenfabrik Lorenz AG
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Priority to DE19691930398 priority Critical patent/DE1930398C3/de
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00Shaping by press-cutting; Perforating
    • B21D28/02Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/16Shoulder or burr prevention, e.g. fine-blanking
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/566Interrelated tool actuating means and means to actuate work immobilizer
    • Y10T83/5669Work clamp
    • Y10T83/5715With sequencing means
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/566Interrelated tool actuating means and means to actuate work immobilizer
    • Y10T83/5669Work clamp
    • Y10T83/5787Clamp driven by yieldable means
    • Y10T83/5805Fluid pressure yieldable drive means
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/869Means to drive or to guide tool
    • Y10T83/8821With simple rectilinear reciprocating motion only
    • Y10T83/8835And means to move cooperating cutting member
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/869Means to drive or to guide tool
    • Y10T83/8821With simple rectilinear reciprocating motion only
    • Y10T83/8858Fluid pressure actuated

Abstract

A punching apparatus in which two tool portions come together to punch out a workpiece. At least one tool portion is mounted on a cylinder housing with one part of that tool portion fixed relative to the cylinder housing and another part movable relative to the cylinder housing. Such movement of the tool parts is provided by inner and outer piston systems in the cylinder housing. Either piston system can be fixed to the cylinder housing while the other remains movable relative to the cylinder housing. The movable part of the tool portion can be connected to either piston system, depending on which is arranged to be movable relative to the cylinder housing.

Description

mted States Patent [151 3,646,116?

Axtmann Feb. 8, 1972 [54] PUNCHING APPARATUS 2,586,695 2/1952 Mueller ..83/639 X [72] Inventor: Adam Axtmann, Burback, Gennany Primary Emminer Andrew R. Juhasz 731 Assignee: Maschinenfabrik Lorenz AG, Ettlingen Assistant Examiner-Mon Gilden (Baden), Germany Attorney-Larson, Taylor and Hinds [22] Filed: June 15, 1970 57 ABSTRACT PP 46,341 A punching apparatus in which two tool portions come together to punch out a workpiece. At least one tool portion is A u Pri mounted on a cylinder housing with one part of that too] por- [301 Forelgn pp cation onty tion fixed relative to the cylinderhousing and another part June 14, 1969 Germany ..P 19 30 398.1 movable relative to the cylinder housing. Such movement of the tool parts is provided by inner and outer piston systems in [52] US. Cl ..83/380', 83/390, 83/623, the cylinder housing. Either piston system can be fixed to the 83/639 cylinder housing while the other remains movable relative to [5 l ]v Int. Cl ..B26d 5/42 the cylinder housing. The movable part of the tool portion can [58] Field of Search ..83/380, 390, 623, 639 be connected to either piston system, depending on which is I arranged to be movablerelative to the cylinder housing. [56] References Cited 11 Claims, 3 Drawing Figures UNlTED STATES PATENTS r .h

3,0845 80 4/1963 Schmid PUNCHING APPARATUS BACKGROUND OF THE INVENTION This invention relates to a punching apparatus, and in particular it relates to a punching press, especially for fine punching operations, wherein two opposing ram systems come together as tool portions on the ram systems cooperating with each other to engage and punch a workpiece located therebetween.

In the case of fine punching and in contrast to "free cut" punching, before the actual punching step, the workpiece must be firmly clamped, that is, held in place in the immediate vicinity at which the punching step will take place in order to prevent the workpiece material from being drawn inwardly during the punching step and thusresulting in an inferior punched edge. This clamping of the outer portion of the workpiece is normally accomplished by means of a raised annular ridge projecting outwardly from an outer part or matrix of the tool portion. However, depending on the shape, nature and size of the workpiece, this matrix which carries the raised annular ridge and maintains the raw material firmly clamped is exposed to large and variable stresses both in the axial direction (that is, the direction of relative movement of the two ram systems) and in the radial direction (that is, in planes generally perpendicular to the axial direction). Moreover, in many cases, these forces will be out of balance, resulting in a large radial resultant force on the outer matrix carrying the annular ridge. In order to obtain a perfect punched edge with the smallest possible surface roughness, it is therefore necessary to firmly hold this outer matrix in a holder or frame which supports it axially as well as radially, firmly engaging the outer periphery of the ring about its entire circumference. For example, in the case of an annular outer matrix, the frame or holder will be ring shaped. Such an encircling holder requires in turn an annular piston arrangement or system in the cylinder housing behind the tool so that the holder can be attached for movement with this annular piston, relative to the cylinder housing, during the punching step. Moreover, in other cases, for example, where the resultant forces on the outer matrix are not as great, it is possible to eliminate this encircling radial support holder. In this case, the outer matrix may be connected to a more simple conventional piston in a cylinder housing for providing the said relative movement of the outer matrix relative to the cylinder housing during the punching step.

Thus, at present, in order to utilize the outer or annular piston arrangement for large loads and also the simple piston system for small loads, it is necessary that the entire piston system be changed when changing over from one mode of operation to another, that is from a large load operation to a small load variation, or vice versa. Such extensive changeover operations are clearly time consuming, and hence, uneconomical.

Thus, there exists a need for improving the operation of a fine punching apparatus for use with different types of punching operations.

SUMMARY OF INVENTION Thus, it is a purpose of this invention to provide a new and improved punching apparatus which overcomes the disadvantages of the prior art.

This purpose of the present invention is achieved by providing an arrangement wherein the changeover time between the different modes of operation is substantially reduced by constructing at least one of the ram systems with a cylinder housing having two coaxial piston systems mounted therein, that is, an annular outer piston system and an inner piston system. The arrangement is such that either one of the piston systems can be arranged for movement relative to the cylinder housing while the other remains fixed relative to the cylinder housing. Therefore, the task of rebuilding the ram system when changing between modes of operation is completely eliminated. Depending on the nature of the tool portion to be mounted on the ram system, it is only necessary to arrange the inner and outer piston systems such that a selected one is fixed to the cylinder housing and the other is movable relative thereto.

Since the invention has particular importance for fine punching presses of the type including an annular ridge formed on a matrix for clamping the workpiece material prior to the punching step, in the present case it is preferable that the ram system having the matrix with the raised edge be the one mounted on the ram system having the coaxial,selectively usable piston systems.

The said piston systems may comprise an inneij elongated piston having an enlarged pistonhead in a chamber in a cylinder housing and front and rear piston rods extending therefrom, the front rod extending toward the tool portion, and the annular piston system may comprise an annular piston surrounding this front piston rod. For large load operations, the inner piston may be clamped to the cylinder housing. for example by screws acting on the rear piston rod. In small load applications, the inner piston rod may be permitted to reciprocate while the annular piston is clamped to the cylinder housing.

For large loads, a holder may be provided, which holder encircles the outer periphery of the outer matrix having the ridge thereon, and this holder may in turn be rigidly secured to the annular piston. In small load operations, the outer'matrix having the ridge thereon may be operatively connected to the inner piston for movement therewith by suitable means such as thrust pins extending axially from the outer matrix to the inner piston.

Thus, it is a purpose of this invention to provide a new and improved fine punching apparatus.

It is another object of this invention to provide a fine punching apparatus which is more efficient in that a process of changing over for different types of punching operations is substantially simplified since it is not required to rebuild the ram systems of the punching apparatus.

It is another object of this invention to provide a new and improved fine punching apparatus wherein at least one ram system thereof includes a cylinder housing having inner and outer coaxial piston systems formed therein and wherein either of these piston systems may be fixed relative to the cylinder housing, permitting the other. to move relative to the cylinder housing.

Other objects and advantages of the invention will become apparent from the detailed description to follow, together with the accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS DETAILED DESCRIPTION OF PREFERRED EMBODIMENT I Referring now to the drawings, likenumerals represent like elements throughout the several views.

Referring to FIG. I, there is shown a frame 1 having mounted thereon right and left ram systems (as viewed in the drawings). The right-hand ram system comprises a carriage 2 mounted in the frame for axial, longitudinal movement by means of roller bearings 3. This ram system also includes a cylinder 4 and a piston 5 mounted therein. The piston 5 includes three integrally connected portions, namely a ram portion 6, an enlarged central portion 6a, and a rear portion 6b.

The ram portion 6 is positioned within the carriage 2. Fluid lines 7 and 8 direct pressurized fluid to different portions of the cylinder 4 on opposite sides of the enlarged piston portion 6b. In addition, a tubular projection extends from the rear wall of the cylinder 4 into a chamber 10 in the central piston portion 6a. Pressurized fluid through passage 11 passes to a passage 11a in the tubular portion 9 to the chamber 10.

On the front end of the carriage 2 there is provided the tool portion associated with the right-hand ram system. The elements comprising this tool portion are shown in FIG. 1 and are also shown schematically in FIG. 2. Basically, this tool portion comprises an outer annular matrix 15 and a central matrix 19, both of which matrixes are nonyieldingly connected to the carriage 2 for movement to the left during the punching process directly with the piston 2. Between the two matrixes is an annular punching member which is connected to the carriage 2 through piston rod 22 and yielding piston and cylinder unit 23 so that this punching member 20 will yield as the carriage 2 is moved to the left during the punching process. The outer matrix 15 is nonyieldingly connected to the carriage 2 through spacing elements 15 and 18. The central matrix 19 is nonyieldingly connected to the carriage 2 through spacing element 17 which is connected to (and possibly formed integral with) the spacing element 16. The punching member 20 is then yieldingly connected to the piston 22 through thrust pins 21 which engage the head of piston 22 and do not engage the spacing element 18 whereby the member 20 can be moved inwardly (that is, to the right) relative to the elements 15 and 19. This right-hand tool portion is then mounted in an encircling holder 13 which is secured to the carriage 2 through bolts. Of course this holder 13 also assists in providing a nonyielding connection between the carriage 2 and the outer matrix 15.

The left-hand ram system comprises a cylinder housing 24 having a cylinder chamber 24a formed therein. A piston 25 located in the chamber 24a includes a rear piston rod 27 having a flange 29 formed thereon. Suitable means such as a screw 28 are provided for rigidly securing the flange 29, and hence the piston 25, to the cylinder 24. The piston 25 also includes a front piston rod 30 which is surrounded by an annular piston 26, the latter having a front radially projecting flange portion 26a. A stop member 42 rigidly connected to the cylinder 24 by bolts 43 engages this flange portion 260 to limit axial movement of piston 26.

Referring now to FIG. 2 as well as FIG. 1, the tool portion on this left-hand ram system comprises an outer annular matrix 33 and a central matrix 35. The outer matrix 33 has formed thereon the annular raised gripping ridge 34 for holding the workpiece material to prevent the same from being drawn in during the punching step. In the mode of operation as shown in FIGS. 1 and 2, the inner piston 25 is fixed against movement relative to the cylinder housing 24 while the piston 26 is permitted to move relative to the cylinder housing 24. In this case, the matrixes 33 and 35 are nonyieldingly connected to the piston 26 for movement therewith while the annular punching member 32 is connected to the piston 25 to remain stationary like the piston 25 during the punching step.

In this mode of operation, the outer matrix 33 having the annular ridge 34 formed thereon is normally subjected to large radial and axial forces, and hence it is supported by a toolholder 36 which encircles the outer periphery thereof. Holder 36 is in turn rigidly secured to the annular piston 26 by means of bolts 37. The inner matrix 35 is then nonyieldingly connected to the piston 26 through a flange at the rear end of element 35 and a thrust element 39 which extends from this rear flange to a spacing element 40 which in turn engages the annular piston 26. The annular punching member 32 is then nonyieldingly engaged with the piston 25 through a flange 38, thrust pins 31, and a spacing element 30a, the latter engaging the piston 25.

Accurate axial relative movement of the two ram systems is provided by guide pins 14 which extend from the toolholder 36 to a bore formed in the toolholder 13.

Fluid passages 41 and 52 supply pressurized fluid to different parts of chamber 24a. The selection of either passage 41 or 52 is determined by switch 53 and this is in turn dependent upon which of the two piston 25 or 26 is movable and which is fixed to the cylinder 24.

When the apparatus is arranged for the mode of operation as shown in FIGS. 1 and 2, the operation is as follows. A workpiece which may be in the form of an elongated strip of material is fed into the space between the two tool portions. For example, the strip S may be an endless strip which is fed (by means not shown) horizontally through the space between the two tool portions. The two tool portions are then brought together rapidly by supplying fluid through lines 11 and 11a to the chamber 10 until the tool portions reach a position whereat they just engage the strip workpiece S as shown in FIG. 2. Fluid is then introduced through fluid line 7 thereby utilizing the larger rear surface of portion 6b for creating the necessary force for the actual punching step. Upon further movement of the carriage 2 to the left and the fluid introduced through line 7, first of all the annular raised ridge 34 becomes impressed in, and thus firmly clamps the outer portion of the workpiece. As the carriage 2 continues its movement to the left, the annular punching member 20 engages, through the workpiece, the annular punching member 32. Since this latter punching member cannot move, the members 20 and 32 are at that point prevented from undergoing further movement to the left. However, elements 33 and 35, by virtue of their connection to the movable yieldable annular piston 26, will continue to move to the left under the force of the moving carriage 2, the force being exerted through outer matrix 15 and central matrix 19 to the outer matrix 33 and the central matrix 35. This constitutes the actual punching step with the outer portion of the strip S and a central waste portion B moving to the left with the desired article W remaining between the elements 20 and 32. The finished article W is then ejected during the return stroke of carriage 2 as the member 20 moves to the left relative to the matrixes 15 and 19 and the matrix 35 acts as ejector for the central waste portion B.

FIG. 3 illustrates the different mode of operation wherein the forces acting on the outer matrix 33 are not as great and hence it is not necessary to use the more complicated mounting arrangement of FIGS. 1 and 2. Specifically, it is desired to eliminate the elements requiring a nonyielding engagement between the outer matrix 33 and the annular piston 26 and instead to provide a nonyielding engagement between the outer matrix 33 and the inner piston 25. First, the screws 28 are removed from the inner piston 25. First, the screws 28 are removed from flange 29, thereby permitting reciprocating movement of piston 25. Switch 53 is then operated so that fluid will be introduced through line 52 rather than line 41. Bolts 44 are then provided for rigidly securing annular piston 26 to the cylinder housing 24. The tool portion of the lefthand ram system is then removed. Specifically, elements 30a, 31, and 36 through 40 are then removed and replaced by the elements shown in FIG. 3. Also, the tool elements 33, 32, and

' 35 are replaced by tool elements 47, 46 and 49, respectively.

A spacing member 51 is positioned at the right end of front piston rod 30. The simplicity of FIG. 3 relative to FIG. 1 is apparent. Engagement between the outer matrix 47 and the yielding piston 25 is provided by means of thrust pins 50 which engage the member 51 while the central matrix 49 directly engages the member 51. Nonyielding engagement of the member 46 with the fixed piston 27 is provided by means of a holder 45 which surrounds the tool and is engaged with the piston 26 by means of bolts 370. This arrangement also includes guide pans 14 for providing accurate relative movement between the two ram systems.

Only the portions of the ram systems forming the pressing part are shown in FIG. I, the other parts such as the details of the drive arrangement, being omitted for purposes of clarity since they do not form a part of the present invention. Although the elements are shown as being driven hydraulically, other types of drives are possible, for example, mechanical drives, combinations of mechanical and hydraulic drives, et cetera. The tool portions shown herein illustrate the formation of an annular punched article. However, other tool shapes providing other types of articles are clearly within the scope of the invention. For example, irregular articles may be punched. Also, while the punch shown in this embodiment is closed in that the punchlines are closed circles, the invention may also be used for open cuts" wherein the punchline extends to the outer periphery of the workpiece.

Although the invention has been described in considerable detail with respect to a preferred embodiment thereof, it will be apparent that the invention is capable of numerous modifications and variations apparent to those skilled in the art without departing from the spirit and scope of the invention.

I claim:

housing, inner and outer relatively movable coaxial piston 1. A punching apparatus comprising, aframe, first and systems mounted in the cylinder housing, each piston system operatively connected to at least one part of the tool of the first ram system, said inner and outer piston systems being constructed such that either one of them can be fixed to the cylinder housing to prevent movement of that fixed piston system relative to the cylinder housing while the other piston system is movable relative to the cylinder housing, whereby relative movement of the inner and outer piston systems assist in the punching of the workpiece when the two ram systems are brought together.

2. A punching apparatus according to claim 1, the tool portion of the said first ram system including an annular outer matrix, an annular raised ridge on said outer matrix projecting therefrom toward the second rarn system, whereby when a workpiece is placed between the two tool portions of the ram systems, and when the tool portions are brought together, the annular ridge is impressed in the workpiece material before the punching begins to prevent the workpiece from being pulled inwardly from said matrix during punching.

3. A punching apparatus according to claim 2, including means for operatively connecting said outer matrix to the outer piston system for movement therewith during punching when the outer piston system is arranged to be movable relative to the cylinder housing, and for operatively connecting the outer matrix to the inner piston system for movement therewith during punching when the inner piston system is arranged to be movable relative to the cylinder housing, and for operatively connecting the outer matrix to the inner piston system for movement therewith during punching when the inner piston system is arranged to be movable relative to the cylinder housing.

4. A punching apparatus according to claim 3, wherein the means for operativelyconnecting the outer matrix with the outer piston system includes a toolholder supporting the matrix radially and axially, and means for operatively connecting the toolholder to the outer piston system for movement therewith.

5. A punching apparatus according to claim 4, including an inner matrix, means for operatively connecting the inner matrix with the outer piston system for movement therewith when the outer matrix is connected to the outer piston system for movementtherewith, said inner and outer matrixes being separated by a punching member operatively connected to the inner piston system such that the punching member does not move relative tothe cylinder housing.

. 6 Apunching member according to claim 3, wherein the means for operatively connecting the outer matrix with the inner piston system includes thrust pins acting as spacing elements between the outer matrix and the inner piston system such that the outer matrix moves with the inner piston system when the two ram systems are brought together.

7. A punching apparatus according to claim 6 including an inner matrix, means for operatively connecting the inner matrix with'the inner piston system for movement therewith when the outer matrix is connected to the inner piston system for movement therewith, said inner andouter matrixes being separated by a punching member operatively connected to the outer piston system such that the punching member does not move relative to thecylinder housing.

8. A punching apparatus according to claim 1 including a stop member connected to the cylinder housing and arranged to limit movement of the outer piston system relative to the cylinder housing.

9. A punching apparatus according to claim 1 wherein said air piston system comprises an axially extending piston having a pistonhead in a cylinder formed in the cylinder housing and including a first piston rod extending from the piston towards the tool portion and including a rear piston rod extending from the piston in a direction opposite from the tool portion, and including means for fixing the rear piston rod to the cylinder housing.

10. A punching apparatus according to claim 9 wherein said outer piston system comprises an annular piston surrounding the front piston rod of the inner piston, and including means for rigidly connecting the outer annular piston to the cylinder housing.

11. A punching press according to claim 10 including a first fluid passage for delivering fluid to the cylinder housing when the outer piston member is fixed to the cylinder housing, and including a second fluid passage for delivering fluid to the cylinder housing when the air piston member is fixed to the cylinder housing, and including a switch for delivering pressurized fluid to either one of said passages depending on which of said piston systems is fixed relative to the cylinder housing.

Claims (11)

1. A punching apparatus comprising, a frame, first and second ram systems mounted on said frame for relative movement axially towards and away from each other, means on each of said ram systems for holding a portion of a punching tool such that when the two ram systems are brought together the two tool portions cooperate with each other to punch a workpiece, at least said first ram system comprising a cylinder housing, inner and outer relatively movable coaxial piston systems mounted in the cylinder housing, each piston system operatively connected to at least one part of the tool of the first ram system, said inner and outer piston systems being constructed such that either one of them can be fixed to the cylinder housing to prevent movement of that fixed piston system relative to the cylinder housing while the other piston system is movable relative to the cylinder housing, whereby relative movement of the inner and outer piston systems assist in the punching of the workpiece when the two ram systems are brought together.
2. A punching apparatus according to claim 1, the tool portion of the said first ram system including an annular outer matrix, an annular raised ridge on said outer matrix projecting therefrom toward the second ram system, whereby when a workpiece is placed between the two tool portions of the ram systems, and when the tool portions are brought together, the annular ridge is impressed in the workpiece material before the punching begins to prevent the workpiece from being pulled inwardly from said matrix during punching.
3. A punching apparatus according to claim 2, including means for operatively connecting said outer matrix to the outer piston system for movement therewith during punching when the outer piston system is arranged to be movable relative to the cylinder housing, and for operatively connecting the outer matrix to the inner piston system for movement therewith during punching when the inner piston system is arranged to be movable relative to the cylinder housing, and for operatively connecting the outer matrix to the inner piston system for movement therewith during punching when the inner piston system is arranged to be movable relative to the cylinder housing.
4. A punching apparatus according to claim 3, wherein the means for operatively connecting the outer matrix with the outer piston system includes a toolholder supporting the matrix radially and axially, and means for operatively connecting the toolholder to the outer piston system for movement therewith.
5. A punching apparatus according to claim 4, including an inner matrix, means for operatively connecting the inner matrix with the outer piston system for movement therewith when the outer matrix is connected to the outer piston system for movement therewith, said inner and outer matrixes being separated by a punching member operatively connected to the inner piston system such that the punching member does not move relative to the cylinder housing.
6. A punching member according to claim 3, wherein the means for operatively connecting the outer matrix with the inner piston system includes thrust pins acting as spacing elements between the outer matrix and the inner piston system such that the outer matrix moves with the inner piston system when the two ram systems are brought together.
7. A punching apparatus according to claim 6 including an inner matrix, means for operatively connecting the inner matrix with the inner piston system for movement therewith when the outer matrix is connected to the inner piston system for movement therewith, said inner and outer matrixes being separated by a punching member operatively connected to the outer piston system such that the punching member does not move relative to the cylinder housing.
8. A punching apparatus according to claim 1 including a stop member connected to the cylinder housing and arranged to limit movement of the outer piston system relative to the cylinder housing.
9. A punching apparatus according to claim 1 wherein said air piston system comprises an axially extending piston having a pistonhead in a cylinder formed in the cylinder housing and including a first piston rod extending from the piston towards the tool portion and including a rear piston rod extending from the piston in a direction opposite from the tool portion, and including means for fixing the rear piston rod to the cylinder housing.
10. A punching apparatus according to claim 9 wherein said outer piston system comprises an annular piston surrounding the front piston rod of the inner piston, and including means for rigidly connecting the outer annular piston to the cylinder housing.
11. A punching press according to claim 10 including a first fluid passage for delivering fluid to the cylinder housing when the outer piston member is fixed to the cylinder housing, and including a second fluid passage for delivering fluid to the cylinder housing when the air piston member is fixed to the cylinder housing, and including a switch for delivering pressurized fluid to either one of said passages depending on which of said piston systems is fixed relative to the cylinder housing.
US3640167D 1969-06-14 1970-06-15 Punching apparatus Expired - Lifetime US3640167A (en)

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CH (1) CH513723A (en)
CS (1) CS161755B2 (en)
DE (1) DE1930398C3 (en)
FR (1) FR2046773B1 (en)
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US20040182209A1 (en) * 2003-03-18 2004-09-23 Franco James S. Cold-headed standoff
US20100095815A1 (en) * 2008-10-20 2010-04-22 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Discharging Workpiece Parts
CN103691798A (en) * 2013-12-13 2014-04-02 武汉华夏精冲技术有限公司 Fine blanking molding method for reducing collapsed corner of fine-blanking piece
US20170008186A1 (en) * 2015-07-06 2017-01-12 Feintool International Holding Ag Apparatus and method for stripping away/pushing out a punched grid/internally formed part and ejecting a blanked part in a precision blanking press

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Cited By (26)

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US3739669A (en) * 1970-05-29 1973-06-19 Suzuki Motor Co Shearing press of opposing die type
US3822622A (en) * 1972-08-07 1974-07-09 Wolverine Pentronix Apparatus for making annular parts
US3878746A (en) * 1972-12-22 1975-04-22 Ibm Burless blanking machine and process
US4024794A (en) * 1973-02-02 1977-05-24 Amp Incorporated Pneumatically operated cable-slitting tool
US3991641A (en) * 1975-07-18 1976-11-16 Springfield Tool & Die, Inc. Piercing apparatus
US4164158A (en) * 1977-03-29 1979-08-14 Rolf Peddinghaus Punching apparatus
US4819476A (en) * 1987-07-17 1989-04-11 Amp Incorporated Tooling for forming machines having improved guidance, tool mounting, and pilot pin systems
US5413018A (en) * 1991-06-20 1995-05-09 Fuji Electric Co., Ltd. Piezo-electric actuator operated press
WO1994005469A1 (en) * 1992-08-27 1994-03-17 Kohol Systems, Inc. Trim press
US6408726B1 (en) * 1995-12-14 2002-06-25 Lillbacka Jetair Oy Sheet metal work center with a movable lower die operative as a stopper and an upwards forming tool
US6314852B1 (en) * 1998-08-03 2001-11-13 International Business Machines Corporation Gang punch tool assembly
US6389940B1 (en) 1998-08-03 2002-05-21 International Business Machines Corporation Gang punch tool assembly
US6237458B1 (en) * 1998-12-15 2001-05-29 Btm Corporation Auto equalized dual pierce unit
US7421875B2 (en) 2003-03-18 2008-09-09 Pem Management, Inc. Cold-headed standoff
US7631532B2 (en) 2003-03-18 2009-12-15 Pem Management, Inc. Cold-headed standoff
US20070000114A1 (en) * 2003-03-18 2007-01-04 Pem Management, Inc. Cold-headed standoff
US20080302162A1 (en) * 2003-03-18 2008-12-11 Pem Management, Inc. Cold-headed standoff
US20040182209A1 (en) * 2003-03-18 2004-09-23 Franco James S. Cold-headed standoff
US7175533B2 (en) 2003-11-26 2007-02-13 Pem Management, Inc. Method of forming a cold-headed standoff
US20060196330A1 (en) * 2003-11-26 2006-09-07 Pem Management, Inc. Method of forming a cold-headed standoff
US20100095815A1 (en) * 2008-10-20 2010-04-22 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Discharging Workpiece Parts
US8499668B2 (en) 2008-10-20 2013-08-06 TRIUMPF Werkzeugmaschinen GmbH + Co. KG Discharging workpiece parts
CN103691798A (en) * 2013-12-13 2014-04-02 武汉华夏精冲技术有限公司 Fine blanking molding method for reducing collapsed corner of fine-blanking piece
CN103691798B (en) * 2013-12-13 2015-11-18 武汉华夏精冲技术有限公司 A kind ofly reduce smart stamping and to collapse the fine-punching formation method at angle
US20170008186A1 (en) * 2015-07-06 2017-01-12 Feintool International Holding Ag Apparatus and method for stripping away/pushing out a punched grid/internally formed part and ejecting a blanked part in a precision blanking press
US10682782B2 (en) * 2015-07-06 2020-06-16 Feintool International Holding Ag Apparatus and method for stripping away/pushing out a punched grid/internally formed part and ejecting a blanked part in a precision blanking press

Also Published As

Publication number Publication date
FR2046773A1 (en) 1971-03-12
JPS514316B1 (en) 1976-02-10
DE1930398A1 (en) 1970-12-23
DE1930398B2 (en) 1973-11-08
CS161755B2 (en) 1975-06-10
PL72773B1 (en) 1974-08-30
DE1930398C3 (en) 1974-06-06
CH513723A (en) 1971-10-15
SU383256A3 (en) 1973-05-25
FR2046773B1 (en) 1974-09-06

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