WO2001026901A1 - Procede et dispositif pour le marquage de pieces - Google Patents

Procede et dispositif pour le marquage de pieces Download PDF

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Publication number
WO2001026901A1
WO2001026901A1 PCT/US2000/028618 US0028618W WO0126901A1 WO 2001026901 A1 WO2001026901 A1 WO 2001026901A1 US 0028618 W US0028618 W US 0028618W WO 0126901 A1 WO0126901 A1 WO 0126901A1
Authority
WO
WIPO (PCT)
Prior art keywords
workpiece
tool
marking
support
accordance
Prior art date
Application number
PCT/US2000/028618
Other languages
English (en)
Inventor
Albrecht Schneider
Original Assignee
Mate Precision Tooling Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE1999149552 external-priority patent/DE19949552C1/de
Application filed by Mate Precision Tooling Inc. filed Critical Mate Precision Tooling Inc.
Priority to AU80259/00A priority Critical patent/AU8025900A/en
Publication of WO2001026901A1 publication Critical patent/WO2001026901A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
    • B21C51/005—Marking devices
    • 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
    • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
    • B21D17/02—Forming single grooves in sheet metal or tubular or hollow articles by pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
    • B44B5/0004—Machines or apparatus for embossing decorations or marks, e.g. embossing coins characterised by the movement of the embossing tool(s), or the movement of the work, during the embossing operation
    • B44B5/0019—Rectilinearly moving embossing tools

Definitions

  • the present invention relates to a method and apparatus for marking workpieces on a punching press, wherein the marking tool is forced by means of the punching stroke either against the surface of the workpiece to form a mark on the surface thereof or a certain depth into the surface of the workpiece to form the marking by inscribing.
  • the workpiece which is generally a piece of flat sheet metal is displaced within its plane in order to create a straight or curved marking line.
  • stamping dies are not always practical because the stamping is often also visible on the back of sheet metal workpiece. Difficulties in connection with stamping dies occur particularly when it is intended to punch parts of different lengths out of a sheet metal workpiece (e.g., in order to minimize waste) and wherein a certain orientation of the marking on the workpiece is desirable.
  • a known method for marking sheet metal consists of embossing dot matrices for producing an alpha-numeric symbol with the aid of a pointed embossing tool. The workpiece must be moved stepwise after each dot has been embossed. This results in a multitude of required stamping stroke cycles, just to represent a single symbol.
  • a coarser dot matrix does simplify the marking process, but it also results in a more unsatisfactory matrix.
  • a qualitatively appealing marking can be achieved by inscribing markings into the surface of the workpiece, wherein no waviness or "rear embossing" will occur.
  • the marking tool is equipped with a tip which, after having been forced against or into the surface of the workpiece, is maintained at a marking position, at which time the workpiece is displaced in its plane in accordance with the contour of a symbol to be marked, and thereafter the tip is moved away from the workpiece to its rest position.
  • the production of visually pleasing markings of any arbitrary symbol on or in the workpiece surface is made possible by means of the marking tool being placed on the punch press without any additional, space-consuming devices.
  • the marking method is optimally integrated into the punching process so that, for example with a turret punch press, a sheet metal workpiece is first marked at the desired locations and thereafter is finished by means of the tools seated in other holders of the punch press.
  • the marking tool may be arranged in a punch tool holder or in a holder on the workpiece support table of the punch press, so that the marking can be made from above or below the workpiece, as required.
  • the orientation of the marking can be determined by means of the software which controls the workpiece driving mechanism.
  • the tool tip need be moved only once into its marking position, so that the number of punch strokes which must be performed by the punch press is considerably reduced. The results are reduced noise generation and reduced wear of the stroke driving mechanism.
  • At least a portion of the punch stroke is absorbed by an elastic element which extends between a table for seating the workpiece and the punch tool holder. Since punch presses are designed for very high processing forces, with high precision and almost load-free, it can be very difficult under certain circumstances to move the stroke driving mechanism into a precisely defined position. To compensate for this, it is possible by an elastic element to achieve considerably more precise movement of the tool tip on or into the surface of the workpiece. In the process, the elastic element translates the relatively large punch stroke of the punch press into an exactly defined contact pressure force of the tool tip, which leads to the desired marking position.
  • At least one marking is formed as center mark, wherein, following pressing the tool tip, the workpiece is maintained in its predefined position until the marking tool is retracted.
  • center mark it is desirable for some applications to be able to set a center mark on the workpiece, for example in order to be able to position or center bolts or pins which are to be welded onto the workpiece.
  • the provision of the center mark can be integrated into the marking process and apparatus in accordance with the invention, wherein it might be advantageous if, in connection with a center mark, the tool tip were pressed deeper into the workpiece than the usual inscribing depth.
  • an apparatus for carrying out the method of the present invention comprises of a marking tool and a counter- support on the opposite side of the workpiece, wherein the marking tool has a tool tip which can be forced in against the restoring force of an elastic element and which can be fixed in place in a punch holder or in the workpiece table of a punch press.
  • the counter-support can be fixed in place on the punch holder, in the table or on the punch holder. It is possible with the aid of the at least one marking tool with its resilient tool tip and the appropriate counter-support to execute the marking or center marking operations on a punch press with its workpiece which is movable in its plane.
  • marking tool is arranged below or above the workpiece, or whether marking tools are provided on both sides of the workpiece in order to mark both sides thereof in cooperation with appropriate counter-supports.
  • marking tool and one counter-support in combination can constitute one half of the apparatus above or below the workpiece.
  • the counter-support preferably has at least one rotatable support roller or support ball for the movable support of the workpiece.
  • balls or rollers as the support offer the possibility of a dependable support, with mobility provided without damage to the surface or at least limiting frictional losses to occur only at the contact points.
  • the marking tool preferably has, besides the tool tip, rotatable support rollers or support balls, which are seated in an elastically spring-loaded manner.
  • the spring travel of the support rollers or support balls is preferably greater than the spring travel of the tool tip.
  • the resilience of the elastic elements of the support rollers is suitably less than that of the elastic element of the tool tip in order to achieve a sufficient contact pressure when applying the marking symbols, and in order to introduce only small forces into the workpieces by means of the support rollers or support balls, noting that the sheet metal workpiece can be comparatively thin.
  • the resilience of the support roller or support balls should be sufficient for supporting the workpiece during the operation.
  • a cone-shaped tip of the inscribing element is preferably forced into the workpiece surface, so that an inscribing force is achieved regardless of the direction of movement.
  • shapes which are not round are also conceivable which, when required, can be rotated in accordance with the direction of movement of the workpiece, or which can also specifically cut grooves of different thicknesses into the workpiece surface.
  • the marking tool has an adjustable support, by means of which the position of the tool tip and/or the prestress of its elastic element can be adjusted.
  • the adjustable support makes possible the individual adaptation of the contact depth, for example in order to improve the clarity of the symbols in the same material of the workpiece, or to make possible an adaptation to the material of the workpiece.
  • a marking such as an ink marking or the like on the surface of the sheet metal instead of inscribing the marking into the sheet metal.
  • Making an ink marking would use the same method and apparatus as described above with respect to inscribing except that the method and the equipment would be adjusted such that the marking tools such as a pen or the like would simply be forced with sufficient pressure against the surface of the workpiece, as opposed to entering into the surface of the workpiece.
  • Any suitable pen could be used including for example, a ball-point pen, a roller ball pen, a felt tip pen or a grease pencil.
  • Fig. 1 is a central cross sectional view of a marking tool for insertion into a punch holder
  • Fig. 2 is a central cross sectional view of a marking tool for insertion into a holder on a workpiece supporting table of a punch press, wherein the right and left sides show two different positions
  • Fig. 3 is a central cross sectional view of a marking tool similar to Figure 2, but showing a modification thereof, and
  • Fig. 4 is an enlarged view of a portion of Figure 1, but showing a modification thereof.
  • the marking tool has a guide bush 14, in which a support 16 is axially guided, and a driving head 20, which are in engagement with each other via a threaded connection 22.
  • the support 16 holds an inscribing tool 26, which is axially movable with respect to the support 16 and has a tool shaft 28 which is guided in an appropriately fitted bore 30 of the guide insert 24, a pressure plate 32, formed at the top of the shaft 28, as well as an inscribing element 34, seated on the free lower end of the shaft 28.
  • the inscribing element 34 is embodied as a pointed cone and can be made, for example, of a diamond, boron nitride, a hard metal, or an otherwise suitable material for inscribing the respective workpiece.
  • the axial mobility of the inscribing tool 26 in relation to the support 16 is limited by a first shoulder 36 of a bore 38 in the support 16, and by the top 40 of the guide insert 24 inserted into the bore 38.
  • a compression spring 44 arranged under prestress between a second shoulder 42 and the pressure plate 32, urges the pressure plate 32 downwardly against the top 40 of the guide insert 24.
  • the workpiece 12 is a sheet metal plate which rests on a tool holder 46 with a rotatably seated ball 48, wherein the contact point between the workpiece 12 and the ball 48 lies exactly in alignment with the inscribing element 34.
  • the workpiece is first appropriately aligned with the marking tool 10. Thereafter, lowering of the inscribing tool 26 is started by actuating the stroke driving mechanism of the punch press, which acts on the driving head 20, wherein the guide bush 14 is urged against the support 16 by means of a shoulder 50.
  • the stroke driving mechanism of the punch press which acts on the driving head 20, wherein the guide bush 14 is urged against the support 16 by means of a shoulder 50.
  • the inscribing tool 26 is initially moved along until the inscribing element 34 rests on the surface of the workpiece.
  • the continued downward movement of the support 16 leads to compression of the compression spring 44, and therefore the pressure exerted on the pressure plate 32 steadily increases.
  • the inscribing element 34 penetrates the surface of the workpiece and reaches its maximum penetration depth at the end of the punch stroke.
  • An adjustment of the penetration depth of the inscribing element 34 can be performed by a relative turning of the driving head 20 in relation to the support 16. This changes the effective total combined length of support 16 and driving head 20. With this increased length of the support 16 and driving head 20 the inscribing element 34 reaches the surface of the workpiece earlier in the punch stroke, and the pressure built up by means of the compression spring 44 becomes correspondingly greater.
  • the stroke driving mechanism of the punch press is blocked. Conversely, if the stroke driving mechanism of the punch press did not permit the marking tool to stop in the inscribing position, a separate detent device must be provided between the support 16 and the guide bush 14. With the inscribing element 34 held down, the workpiece 12 is now displaced in its plane in order to form the contours of the symbol to be inscribed, wherein any arbitrary orientation of the symbol is possible by an appropriate control of the workpiece driving mechanism.
  • the stroke driving mechanism is reversed, wherein first the support 16 is moved away from the workpiece 12 because of the diminishing pressure force by the spring 44 and, following the contact of the pressure plate 32 with the top 40 of the guide insert 24, the inscribing element 34 is lifted off the workpiece 12.
  • the workpiece 12 is appropriately horizontally displaced within its plane and the inscribing process is repeated for inscribing additional symbols.
  • the roller body 48 of the counter-support 46 follows this movement, wherein an optimal counter-support directly in alignment with the inscribing element 34 always exists. Because the roller ball 48 turns, sliding movements against the underside of the workpiece 12 are prevented, so that the underside of the workpiece 12 is not detrimentally affected.
  • the guide bush 14 is adapted to the tool holder and the driving head 20 is adapted to the stroke driving mechanism of the punch press.
  • the compression spring 44 can be replaced with a pneumatically or hydraulically operating pressure spring.
  • FIG. 2 illustrates a marking tool 100, which can be inserted into a support on the workpiece supporting table of a punch press.
  • the marking tool 100 has a housing 102, which has a circular bore 104, in which is received a ring-shaped holder 106.
  • the ring-shaped holder 106 is resiliently axially supported in the punching direction by means of several helical springs 110, which are located within the circumference of a first shoulder 108.
  • the holder 106 has two or more recesses 112, in which inserts 116, which rotatably receive support balls 118, have been fixed in place by means of threaded bolts 1 14.
  • the marking tool 100 moreover has a cone-shaped tool tip 124 made of a suitable material, for example a hard alloy.
  • the tool tip 124 has been inserted via a screw thread 126 into a bore 128 of a tool holder 130, which is resiliently supported by means of a helical spring 132 on a bottom cover 134.
  • the cover 134 has been screwed into a screw thread in the bottom of housing 102.
  • the tool holder 130 is guided in a guide bore 135 of a housing element 136, which is screwed together with the housing 102 by means of a screw connection.
  • a rotation guard 138 in the form of a bolt prevents relative rotation between the tool holder 130 and the housing element 136.
  • the maximum retracted resilient position of the tool holder 130 with the tool tip 124 is limited by the bottom face 146 of the tool holder 130 engaging the bottom cover 134, wherein the travel of the springs 110 of inserts 116 is greater than the travel of spring 132 the of tool holder 130.
  • the support balls 118 project upwardly past the tool tip 124, while in the maximum retracted resilient state of the inserts 116 and of the tool holder 130, the tool tip 124 projects upwardly slightly past the tops of the support balls 118.
  • a tool corresponding to the marking tool 100 and having a further tool tip can be provided in the area of the punch holder of the respective punch press. It is also within the invention to provide only a simple counter- support with support balls, which can be aligned with the support balls 118 of the marking tool 100. A reverse arrangement is also within the invention, wherein only a counter-support with support balls 118 is provided on the table side, and a tool similar to the tool 100 is provided in the punch holder.
  • a workpiece to be marked normally a sheet metal piece, initially rests on the support balls 118 of the tool 100 and is not in contact with the tool tip 124. In this position the sheet metal workpiece can be displaced horizontally in its plane without the tool tip 124 causing damage to the surface.
  • a punch stroke is initiated. In the course of this stroke, the sheet metal workpiece is moved downwardly, for example by pressure balls on the top of the workpiece, wherein the inserts 116 are lowered against the force of the helical springs 1 10.
  • the tool tip 124 reaches the surface of the sheet metal workpiece, and the prestressed spring 132 of the tool holder 130 is compressed by means of continued lowering, because of which a contact pressure force of the tool tip 124 is built up on the surface of the sheet metal workpiece.
  • the tip 124 slightly penetrates into the material of the workpiece under this contact pressure force. If symbols are to be inscribed into the surface of the workpiece, the bottom dead center position is set in such a way that the tool holder 130 does not yet rest against the bottom cover 134. Therefore the penetration depth of the tool tip 124 remains relatively slight.
  • the sheet metal workpiece is displaced horizontally in its plane in accordance with the contours of a symbol to be inscribed.
  • the top dead center position of the punch holder is then again approached. Now the position of the sheet metal workpiece can be moved and, if desired, further symbols can be inscribed.
  • FIG. 1 illustrates another embodiment 200 of a marking tool.
  • Figure 3 is similar to the embodiment of Figure 2 except for certain modifications. Accordingly, those elements in Figure 3 which are identical to Figure 2 are represented by the same numeral. Those elements which have been modified have been raised by 100 relative to the numeral used to describe the related part in Figure 2.
  • Figure 3 shows a diamond tool tip 224 which is seated in a shaft 226. This shaft 226 has been fixed in place by means of an attachment screw 228 on a tool holder 230. The essential difference of the tool holder 230 in comparison with the tool holder 130 of Fig.
  • the tool holder 230 has an increased free space between its bottom face 246 and the bottom cover 234, so that even with the holder 106 being maximally retracted resiliently and resting against the first shoulder 108, the spring travel of the tool holder 230 is not at its maximum compression. Therefore the marking tool represented in Fig. 3 is only suitable for inscribing symbols wherein the greater hardness of the diamond tip 224 provides a longer service life, while the increased travel of spring 132 protects the diamond tip from shocks caused by engaging the detent 142. As described above, the described tools for marking and possibly providing center marks can be used on the workpiece supporting table side as well as on the punch holder side, so that processing of both sides of the workpiece is possible.
  • FIG. 4 illustrates a modification of the present invention wherein, instead of an inscribing element, there is provided an ink point 334 for marking the surface of the workpiece 12 without penetrating same.
  • Ink point 334 is shown at the lower end of a shaft
  • All of the above described features of all embodiments of the invention can utilize an ink element 134 to mark the surface of a workpiece in place of the previously described elements for inscribing the workpiece and/or forming a center mark.
  • an ink marking point 334 when using an ink marking point 334, one would simply adjust movements of all of the other movable parts such that instead of penetrating the workpiece, the apparatus would move the ink point 334 to a position whereat it exerted sufficient force onto the workpiece to form an ink marking.
  • the workpiece 12 could then be displaced horizontally within its plane so as to form an ink symbol of straight or curved lines.
  • Any type of known ink point could be used such as a ball-point, a roller ball point, a felt tip or a grease pencil.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

L'invention concerne un procédé et un dispositif servant à marquer une pièce en tôle (12) sur une presse à poinçonner. Un outil de marquage (100), monté dans un porte-outil (130) de la presse à poinçonner, est appliqué contre la surface de la pièce pour y apposer une marque à l'encre ou bien est enfoncé dans la surface de la pièce (12) pour y inscrire une marque. La pièce (12) est déplacée dans son plan en fonction du contour désiré, tout en restant enclenchée par l'outil de marquage (100). L'outil de marquage (100) est monté dans le porte-poinçon ou bien dans un porte-outil (130) du plateau porte-pièce. Un galet ou une bille de support fournit un contre-support sur la face de la pièce (12) opposée à l'outil de marquage (100).
PCT/US2000/028618 1999-10-14 2000-10-16 Procede et dispositif pour le marquage de pieces WO2001026901A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU80259/00A AU8025900A (en) 1999-10-14 2000-10-16 Method and apparatus for marking workpieces

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19949552.1 1999-10-14
DE1999149552 DE19949552C1 (de) 1999-10-14 1999-10-14 Verfahren zum Markieren von Werkstücken auf Stanzmaschinen
DE10049701.2 2000-10-07
DE10049701A DE10049701B4 (de) 1999-10-14 2000-10-07 Verfahren und Vorrichtung zum Markieren von Werkstücken

Publications (1)

Publication Number Publication Date
WO2001026901A1 true WO2001026901A1 (fr) 2001-04-19

Family

ID=26007288

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/028618 WO2001026901A1 (fr) 1999-10-14 2000-10-16 Procede et dispositif pour le marquage de pieces

Country Status (3)

Country Link
EP (1) EP1099509B1 (fr)
AU (1) AU8025900A (fr)
WO (1) WO2001026901A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2937225A1 (fr) * 2014-04-23 2015-10-28 Andreas Maier GmbH & Co. KG Outil de marquage et procédé de remplacement d'une crayon de marquage d'un outil de marquage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HRP20231738T1 (hr) 2020-09-14 2024-03-15 Gerhard Rauch Ges.m.b.H. Uređaj za utiskivanje filma

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5682657A (en) * 1996-03-13 1997-11-04 Amada Mfg America Inc. Punch press equipped with marking apparatus and method for marking by the punch press
US5785436A (en) * 1997-04-09 1998-07-28 Harrison; Michael E. Data platemarking system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3735422A1 (de) * 1987-10-20 1989-05-11 Borries Otto Kg Nadelpraegevorrichtung
JP3681433B2 (ja) * 1995-04-11 2005-08-10 株式会社アマダ パンチプレス及び上型

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5682657A (en) * 1996-03-13 1997-11-04 Amada Mfg America Inc. Punch press equipped with marking apparatus and method for marking by the punch press
US5785436A (en) * 1997-04-09 1998-07-28 Harrison; Michael E. Data platemarking system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2937225A1 (fr) * 2014-04-23 2015-10-28 Andreas Maier GmbH & Co. KG Outil de marquage et procédé de remplacement d'une crayon de marquage d'un outil de marquage

Also Published As

Publication number Publication date
EP1099509B1 (fr) 2004-10-06
EP1099509A1 (fr) 2001-05-16
AU8025900A (en) 2001-04-23

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