EP0418779B1 - Verfahren zum Herstellen von Werkstücken durch Schneiden, insbesondere in einem Konterschneidwerkzeug - Google Patents

Verfahren zum Herstellen von Werkstücken durch Schneiden, insbesondere in einem Konterschneidwerkzeug Download PDF

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Publication number
EP0418779B1
EP0418779B1 EP90117855A EP90117855A EP0418779B1 EP 0418779 B1 EP0418779 B1 EP 0418779B1 EP 90117855 A EP90117855 A EP 90117855A EP 90117855 A EP90117855 A EP 90117855A EP 0418779 B1 EP0418779 B1 EP 0418779B1
Authority
EP
European Patent Office
Prior art keywords
cutting
punch
plate
force
workpiece
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
Application number
EP90117855A
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German (de)
English (en)
French (fr)
Other versions
EP0418779A1 (de
Inventor
Johannes Haack
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Feintool International Holding AG
Original Assignee
Feintool International Holding AG
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
Application filed by Feintool International Holding AG filed Critical Feintool International Holding AG
Priority to AT9090117855T priority Critical patent/ATE104576T1/de
Publication of EP0418779A1 publication Critical patent/EP0418779A1/de
Application granted granted Critical
Publication of EP0418779B1 publication Critical patent/EP0418779B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/0448—With subsequent handling [i.e., of product]
    • Y10T83/0467—By separating products from each other
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/06—Blanking
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2092—Means to move, guide, or permit free fall or flight of product
    • Y10T83/2096—Means to move product out of contact with tool
    • Y10T83/2122—By ejector within a hollow cutter
    • Y10T83/2124—And means to strip the outer surface of a cutter
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2092—Means to move, guide, or permit free fall or flight of product
    • Y10T83/2096—Means to move product out of contact with tool
    • Y10T83/2122—By ejector within a hollow cutter
    • Y10T83/2133—By resiliently biased ejector
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2092—Means to move, guide, or permit free fall or flight of product
    • Y10T83/2096—Means to move product out of contact with tool
    • Y10T83/2135—Moving stripper timed with tool stroke
    • Y10T83/215—Carried by moving tool element or its support
    • Y10T83/2153—Fluid pressure actuated stripper

Definitions

  • the invention relates to a method for producing burr-free workpieces by cutting a punched strip and cutting out the workpiece in the opposite direction in a counter cutting tool with an upper tool part consisting of an upper cutting plate and an upper cutting punch and a lower tool part consisting of a lower cutting plate and a lower cutting punch and a drive device for generating a rectified stroke of one of the tool parts relative to the other tool part.
  • the invention further relates to a device according to the preamble of claim 8.
  • a device according to the preamble of claim 8 Such a method and such a device are e.g. known from document DE-A-2 727 445.
  • the workpiece is now clamped between the lower and upper punch, so that the punching strip is clamped between the upper and lower punch plate and carried along when the stroke is continued. This causes a workpiece to break out of the punched strip.
  • the present invention is a cutting, which is a modification of a punching process. While a punching strip is acted upon on one side with a cutting punch during punching, the punching strip is clamped between a cutting plate and a press plate, a cutting punch and a counterholder during fine cutting. This significantly improves the quality of the cut surface of the workpiece.
  • the pressure build-up is reversed, i.e. the pressure on the other cutting punch outweighs the pressure that acted on the first cutting punch. This cuts the workpiece from the other side.
  • the inventor has set itself the goal of eliminating these disadvantages of the known counter fine cutting or counter punching and of developing a method which can be used with the aid of an existing fine blanking press and in particular avoids a change of movement within this fine blanking press during a working stroke.
  • the punching strip is clamped between the upper cutting plate and the upper cutting punch and the lower cutting plate and the lower cutting punch and then, when the punching strips are clamped in, the upper and lower cutting plate and the upper and lower cutting punch are moved relative to one another such that Cutting the punched strip and cutting out the workpiece in the opposite direction.
  • a major advantage of the present method is that there is no longer any change of motion in the fineblanking press during a lifting operation.
  • the entire counter fine cutting process requires only one work station and only a single lifting process.
  • This lifting process is preferably carried out with a drive device of the fineblanking press which moves a cutting plate and a cutting punch together with a lifting force.
  • a drive device of the fineblanking press which moves a cutting plate and a cutting punch together with a lifting force.
  • the basic drive device of the fineblanking press itself is used here.
  • a fineblanking press usually consists of a table and a ram. The table is often placed over the ram so that the ram is raised towards the table.
  • the actual counter-cutting tools, such as cutting punches and cutting inserts, are each on the table or on the ram.
  • a separate device should preferably be assigned to each cutting plate as well as each cutting punch, which acts on both the cutting punch and each cutting plate with a certain compressive force independently of the actual lifting force of the fine blanking press drive device, for example the press ram.
  • a suitable hydraulic system with a hydraulic pressure medium is preferably provided for building up the pressure forces, since this hydraulic pressure medium can be regulated and switched on or off at the correct time. This ensures the highest precision and production performance.
  • Mechanical springs could also be used, but these have a force-displacement characteristic and cannot be regulated or can only be regulated in a complicated manner. However, other possibilities of building up pressure should also be encompassed by the present inventive concept.
  • the lifting force should be selected to be greater than the sum of the compressive forces which act on the cutting plates or the cutting punches and carry out the actual counter fine cutting process during the lifting process.
  • This cutting force is also a certain cutting force for cutting the workpiece, this cutting force being the product of the cutting line length, the material thickness and the specific shear strength of the material.
  • the workpiece is actually cut by a cutting punch in cooperation with the other cutting punch, while the cutting is carried out by the further movement of the cutting plates along the cutting punch during the stroke.
  • a cutting plate and a cutting punch are moved by the press hydraulics, ie the lifting force, against the other cutting punch or the other cutting plate, until the punching strip is clamped.
  • the press hydraulics ie the lifting force
  • the pressure force of the cutting punch that has been lifted outweighs that of the other punch that is in the other cutting plate.
  • the pressure force which acts on the other cutting plate outweighs that which acts on the cutting plate to be lifted.
  • the cutting punch which is subjected to a lower force, is therefore pushed back as far as it will go, while the raised cutting plate remains standing.
  • the pushing back occurs by a measure which corresponds to a fraction of the thickness of the workpiece. This cuts the workpiece. However, since the pushed-back cutting punch now stops as a result of the stop, this cutting process is also stopped, i.e. the cutting stamp stops. At this moment, the raised insert, which has so far been stopped by the pressure of the counter-cutting insert, has reached a stop, so that the lifting force of the fineblanking press now outweighs the counter-holding force of the other insert. During the further lifting process, the lead frame is now taken along and passed both cutting punches until the workpiece is cut out. The cutting process is finished, all pressure forces on the cutting plates or cutting punches are switched off. The lifting force is also switched off, so that the plunger, on which the one insert and the one die are located, is lowered. The cut workpiece is located in this insert, while the lead frame on the other insert remains around the die there.
  • one cutting punch then ejects the workpiece, while the opposite cutting plate strips the lead frame from its cutting punch.
  • the punched strip can now be moved further in the device and a next lifting process or a counter fine cutting process can be started.
  • a corresponding device for producing burr-free workpieces by counter-fine cutting from a punched strip or the like, which is clamped between an upper and a lower cutting plate the cutting takes place in cooperation with an upper and a lower cutting punch.
  • a machine drive with a lifting force is provided for a unit consisting of cutting plate and cutting punch, and both this cutting plate and this cutting punch, as well as the other cutting plate and the other cutting punch, are acted upon by compressive forces.
  • the tool structure works with practically the same upper and lower parts. Both cutting plates and both cutting punches, which together effect the cutting process, can be identical.
  • the tool structure corresponds to an overall cut in which the workpiece is manufactured in one press stroke. The cutting process itself takes place when the material is clamped at all times. In the present case, it is preferably a so-called 5-way machine.
  • the plunger of the fineblanking press performing the stroke advantageously works at a controlled, adjustable speed in order to take account of the respective materials and the desired partial shapes.
  • performing the lifting process by means of the ram with adjustable speed means a longer service life of the active cutting elements, which bring about the actual cutting process.
  • the plunger can work from top to bottom as well as from bottom to top.
  • a cutting punch At rest, i.e. in the starting position before a new stroke, a cutting punch maintains a distance from a stationary insert ring or the like, which can be changed to zero under the pressure of the other cutting punch. This distance is only a fraction of the thickness of the workpiece, so that it is ensured that the cutting punch cuts the workpiece only by the amount of the distance. This fraction depends on the strength or the properties of the material and its thickness.
  • a corresponding distance is also provided on the other tool part opposite.
  • the opposite insert maintains this distance. As soon as this insert has changed the distance to zero, its pressure outweighs that of the counter-insert, so that cutting of the workpiece by the one cutting punch stops. For this reason, both distances should preferably be the same.
  • the lifting process of the ram of the fineblanking press is ended when the cutting plates with the clamped-in lead frame have traveled a distance corresponding to the dimension from the depth of the gate of the workpiece and the thickness of the workpiece. After covering this path during the stroke of the ram, the workpiece is cut out of the punched strip.
  • a corresponding annular piston in a pressure chamber should preferably be assigned to each cutting plate and each punch, the desired pressure force being built up in the respective pressure chamber.
  • the compressive force which acts on one cutting punch is smaller than the compressive force acting on the other cutting punch. Conversely, the compressive force that acts on one insert is less than that on the other insert.
  • the power ratio is of course always plus the cutting force.
  • the present inventive concept naturally also includes the possibility that the workpiece is first cut through the cutting plates by appropriate control of the compressive forces acting on the cutting plates and corresponding stops and cut out by the cutting punches during the further lifting process.
  • a normal 3-way fineblanking press is used, which is provided with the additional two compressive forces and thus becomes a 5-way fineblanking press.
  • This press can therefore be used for normal fineblanking as well as for counterblanking.
  • the press thus forms a flexible manufacturing system.
  • a fineblanking press for counter-fineblanking has a machine ram plate 1 which is guided in a ram guide 2.
  • the plunger plate 1 in the plunger guide 2 can be raised in the x direction.
  • a guide plate 3 is connected to the plunger plate 1 and receives the cutting plate 4 as the lower tool part.
  • a further cutting plate 5, which is located on an upper guide plate 6, is assigned to this cutting plate 4 as the upper tool part.
  • This upper guide plate 6 is connected to a base plate 7 which hangs on a table top 8. The attachment is effected via a screw bolt 9 which engages in T-nuts which are fixed in a corresponding groove 11.
  • a lower base plate 12 is fixed on the tappet plate 1, the fixing also taking place via screw bolts 9a which engage in corresponding sliding blocks 10a guided in a groove 11a.
  • a cutting punch 13 is guided in the lower cutting plate 4.
  • This cutting punch 13 is seated on a punch guide 14, which in turn is supported by a punch support plate 17.
  • This platen 17 is finally seated on a pressure pin 19 which is connected to an annular piston 20.
  • a force F2 can be acted upon by a pressure in a pressure chamber 21 from this annular piston 20, the corresponding force F2 being built up hydraulically.
  • a corresponding oil inflow or outflow is identified by 22.
  • a ring bolt 23 passes through the annular piston 20 and rests on the one side of the tappet plate 1 in the pressure chamber 21 and on the other side supports an insert ring 24.
  • the pressure pin 19 is also guided in this insert ring 24 and an annular cylinder 25 is also formed, in which an annular piston 26 is seated.
  • this annular piston 26 forms, together with the annular cylinder 25, a pressure chamber 27 which is supplied with a hydraulic medium via an inflow or outflow line 28.
  • a pressure pin 29 can be moved, which in turn passes through the pressure plate 18.
  • a force F4 acts in the pressure chamber 27.
  • This force F4 is transmitted via the pressure pin 29 to a further pressure pin 30 which engages a pressure disc 31.
  • This thrust washer 31 supports the guide plate 3 and maintains a distance A in the position shown from another thrust washer 32. This distance A can be changed against the force F4 during the cutting process. It will be zero.
  • Distance shoulder screws 34 are also provided between the guide plate 3 and the base plate 12.
  • a pressure plate 35 which surrounds the cutting punch 13, is also embedded in the guide plate 3. Furthermore, on this pressure plate 35 there is an enclosure 36 for the cutting plate 4, the cutting plate 4 being penetrated by a pressure pin 38.
  • a guide plate 39 for a finished workpiece adjoins the border 36, while the border 36 is pressurized with compressed air on the left side by a nozzle 40 of a blow nozzle block 41.
  • the guide plate 3 and the guide plate 6 are connected to one another via guide columns 42 for coordinating the position.
  • the guide columns 42 penetrate guide bushes 43 in the upper base plate 7, guide bushes 44 in the guide plate 3 and guide bushes 45 in the lower base plate 12.
  • the lower cutting plate 4 is assigned the upper cutting plate 5 in the upper guide plate 6, as is the case 36 with an upper case 46 to which an upper pressure plate 47 connects.
  • Cutting plate 5 and pressure plate 47 are penetrated by a cutting punch 48, which in turn is assigned to the cutting punch 13.
  • a pressure pin 49 is also provided in addition to the cutting punch 48, which is supported on the other against a punch holding plate 50 and on the other projects beyond the cutting punch 48 by a measure of the thickness d of a punched strip 66.
  • This stamp holding plate 50 lies against a stamp guide 51 which is arranged below a stamp support plate 52.
  • This stamp platen 52 maintains a distance B with a shoulder 53 from an upper insert ring 54, which is inserted into the table top 8. This distance B can be changed against the pressure of a piston 55 which slides in a pressure chamber 56 within the insert ring 54.
  • a pressure F3 is built up or reduced in the pressure chamber 56 by supplying or discharging a hydraulic medium via the line 57.
  • the upper guide plate 6 is also attacked by a pressure pin 58, which is connected to the upper guide plate 6 via a pressure plate 59, while it is attacked by an annular piston 60 with the interposition of a pin 70.
  • a pressure pin 58 which is connected to the upper guide plate 6 via a pressure plate 59, while it is attacked by an annular piston 60 with the interposition of a pin 70.
  • a support bolt 64 also passes through the annular piston 60.
  • a guide for a punched strip 66 shown in greater detail in FIGS. 2 and 3 is indicated at 65.
  • the plunger plate 1 then continues with a force F, namely by the amount of the distance B, as indicated in Figure 2b).
  • the pressure F2 remains in the pressure chamber 21, this pressure F2 outweighing the cutting force F s and the force F3 in the pressure chamber 56. This means that the cutting punch 48 runs back by the dimension B until the punch support plate 52 comes into contact with the insert ring 54. A corresponding amount of hydraulic medium runs out of the pressure chamber 56 via the line 57.
  • the cutting plate 4 is moved relative to the lower base plate 12, the ring piston 26 running back in the ring cylinder 25 and the pressure force F1 overcoming the force F4. This continues until the pressure disc 31 comes to rest against the pressure disc 32 and the distance A is eliminated. In contrast, the pressure pin 29 now has a corresponding distance A from the lower surface of the lower base plate 12. The punching strip 66 is cut through this step.
  • the plunger plate 1 continues without interruption, as is indicated in FIG. 2c) for the lower base plate 12.
  • the cutting plate 4 is taken along, while the lower punch 13 remains. This occurs because the upper cutting punch 48 or its punch support plate 52 bears against the insert ring 54, so that a further retraction of the upper cutting punch 48 can no longer occur.
  • the upper cutting plate 5, on the other hand, is pushed back against the force F1 by a dimension S, which allows the punched strip 66 to be cut through.
  • the force F1 is greater than the cutting force F s and the force F4. The latter is canceled at the moment when the lower cutting plate 4 has come to a standstill as a result of the guide plate 3 bearing against the lower base plate 12.
  • the upper cutting plate is moved downward by the pressure force F1 by the dimension C, which is higher than the distance B.
  • the cutting plate 5 slides further downward relative to the cutting punch 48, as a result of which the punching strip 66 is stripped off.
  • the pressure build-up F4 also creates the distance A between the cutting plate 4 or its guide plate 3 and the lower base plate 12. This is done relative to the lower cutting punch 13 so that it acts as an ejector for the workpiece 67. This workpiece 67 is blown out of the blow nozzle 40.
  • FIG. 3 An advantage of the method according to the invention can be seen particularly in FIG. 3. While in a normal punching method according to FIG. 6, there is a punched edge pull-in 68 and on the other hand a burr formation 69, the formation of which is only softened in normal fine blanking according to FIG. That is, workpieces 67 are produced without any punch burr 69.
  • FIG. 4 shows, for example, the production of a needle-shaped workpiece 67a.
  • FIG. 5 shows the production of a part with two inner shapes, in this case round holes, which can also have any other shape, part 67 b .
  • Figure 4 shows in the upper half a bottom view of the upper part of the counter-cutting tool, in particular with the upper guide plate 6 and the upper base plate 7.
  • the lower half of Figure 4 represents a plan view of the lower part of the counter-cutting tool, in particular with the guide plate 3 and the base plate 12. Also indicated are the guide columns 42 and the blow nozzle block 41 with nozzle 40.
  • a needle is to be produced, but of course other shapes of workpieces can also be produced in the simplest way, such as, for example, B. in Figure 5 a part 67 b with two holes.
  • the tool frame with base plate 12 and guide plate 3 or 6 and 7 can have any shape.
  • the cutting plates 4 and 5 can also be divided, in one piece, round, angular or consist of other shapes.
  • the same also applies to the mounts 36 and 46.
  • the mounts 36 and 46 can be received in a recess, as shown, or can be placed on the corresponding guide plates 3 and 6.
  • the pressure bolts 58, 70 and 29, 30 should always be arranged around the cutting punches 13 and 48, respectively, so that optically optimal support remains guaranteed.
  • a quick-change device can also be provided, as is shown, for example, in European Patent Specification 0 201 456.
  • Any material can be cut, be it steel, tempering steel, hardenable, rustproof steel, aluminum or its alloys, copper, but also plastics, e.g. fiber reinforced plastics. It can be worked with or without ring spikes.
  • the shape of the parts is arbitrary with or without internal shapes.
  • the material thicknesses are 0.2 to 8.0 mm and above. All of this is encompassed by the present inventive concept.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)
  • Turning (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP90117855A 1989-09-20 1990-09-17 Verfahren zum Herstellen von Werkstücken durch Schneiden, insbesondere in einem Konterschneidwerkzeug Expired - Lifetime EP0418779B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT9090117855T ATE104576T1 (de) 1989-09-20 1990-09-17 Verfahren zum herstellen von werkstuecken durch schneiden, insbesondere in einem konterschneidwerkzeug.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3931320 1989-09-20
DE3931320A DE3931320C1 (zh) 1989-09-20 1989-09-20

Publications (2)

Publication Number Publication Date
EP0418779A1 EP0418779A1 (de) 1991-03-27
EP0418779B1 true EP0418779B1 (de) 1994-04-20

Family

ID=6389772

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90117855A Expired - Lifetime EP0418779B1 (de) 1989-09-20 1990-09-17 Verfahren zum Herstellen von Werkstücken durch Schneiden, insbesondere in einem Konterschneidwerkzeug

Country Status (6)

Country Link
US (1) US5247862A (zh)
EP (1) EP0418779B1 (zh)
JP (1) JPH03165935A (zh)
AT (1) ATE104576T1 (zh)
CA (1) CA2025685A1 (zh)
DE (2) DE3931320C1 (zh)

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JP5461267B2 (ja) * 2010-03-26 2014-04-02 三菱重工業株式会社 電極板製造装置、及び電極板製造方法
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DE59005431D1 (de) 1994-05-26
CA2025685A1 (en) 1991-03-21
DE3931320C1 (zh) 1991-08-08
US5247862A (en) 1993-09-28
ATE104576T1 (de) 1994-05-15
JPH03165935A (ja) 1991-07-17
EP0418779A1 (de) 1991-03-27

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