EP0864384A2 - Verfahren zum Stanzen von Metallteilen mit hohem Endbearbeitungsgrad - Google Patents

Verfahren zum Stanzen von Metallteilen mit hohem Endbearbeitungsgrad Download PDF

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Publication number
EP0864384A2
EP0864384A2 EP98200758A EP98200758A EP0864384A2 EP 0864384 A2 EP0864384 A2 EP 0864384A2 EP 98200758 A EP98200758 A EP 98200758A EP 98200758 A EP98200758 A EP 98200758A EP 0864384 A2 EP0864384 A2 EP 0864384A2
Authority
EP
European Patent Office
Prior art keywords
phase
cutting
piece
matrix
punch
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.)
Withdrawn
Application number
EP98200758A
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English (en)
French (fr)
Other versions
EP0864384A3 (de
Inventor
Gaetano Donatiello
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0864384A2 publication Critical patent/EP0864384A2/de
Publication of EP0864384A3 publication Critical patent/EP0864384A3/de
Withdrawn legal-status Critical Current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

Definitions

  • This invention refers to a process for cutting metallic pieces with a high degree of precision and surface finishing.
  • Such a processing technique while fast and economical, may require a number of successive finishing operations of the piece thus obtained, operations serving the purpose of eliminating the defects typical of a cutting process on a press.
  • This fine cutting technique tries to obtain finished pieces and proves to be particularly useful for the large volume production of cut pieces, ready for assembly.
  • the pieces have been deformed during the cutting process, at least peripherally, they are unsuitable to be returned to their optimum usage conditions.
  • This ridge plays the essential role of blocking the sheet, when it is stressed by the interaction between the punch and the matrix during an actual cutting operation. Moreover, the ridge isolates the part to be cut while preventing its deformation during the cutting process. It must also be remembered that several different types of ridges or cords have been developed, which even further complicate the execution of the process, while improving the quality of cutting piece produced.
  • the general purpose of this invention is to eliminate and solve the previously mentioned technical problems of the known art, in particular of the fine cutting process, in an extremely simple, economical, and particularly functional manner.
  • Another purpose is to eliminate or reduce to the utmost any finishing operation after cutting, which involves further manipulations with additional labor and equipment costs to provide a specific machine for the purpose.
  • 10 indicates on the whole a side portion of a piece and 11 indicates on the whole a scrap or other piece detached from the blank 10, if the metallic material is processed with interlocking forms or in a zigzag fashion to save material.
  • 12 indicates a portion of a matrix working together with a portion of a punch 13.
  • the initial part where both the matrix and the punch interact on the sheet to be cut, so as to produce both the piece 10 and the scrap or other piece 11, shows a rounded or radiated area 15 as a result of the cutting process.
  • a shiny flat area16 can be obtained, in which the matrix and the punch have functioned correctly and which could in a certain sense already be considered to have a good finishing. It is also easy to see that a further area 17 is torn by the continued cutting action, ragged and certainly to be discarded or made to fit the requirements.
  • a second operating phase action is taken on the surface having a mixed profile of the piece 10.
  • This second phase action taken by the matrix 12 on the piece 10, consists in a finishing cutting of the areas previously described and identified by the first cutting phase.
  • the matrix 12 in fact removes on the piece 10 the rounded or radiated zone 15, the flat shiny zone 16 and the torn ragged zone 17, thus creating a scrap as indicated by 18 in the Figure 1a.
  • the same Figure 1a shows the trimmed portion as a dashed zone 19, formed on the whole by the previously mentioned area, which are now being removed.
  • This second phase provides a certain cutting gap, indicated by 20, of a reduced size with respect to that indicated in 14 during the first phase.
  • the gap 20 is a useful distance to avoid a live edge, i.e. the typical projection of material from the rim, forming further burrs or the like.
  • the piece 10 After the completion of the second cutting phase provided according to the process of this invention, the piece 10 presents a smooth and clean surface 21, thus achieving a finished metallic piece, ready for its final usage.
  • the piece 10 can at most show a slight radiation 22 in the part where the contact with the matrix 12 starts at the beginning of the second cutting phase of the invention.
  • Figure 1a shows that the second phase removes areas deformed by the first phase because of the interaction between the punch 13 and the matrix 12. It is however important to highlight that, if there are further deformations of the blank 10, the parts further deformed in whole or in part are removed and finished by the second cutting phase of the process of the invention.
  • the second cutting phase can even be performed only on the part of the piece requiring it.
  • the cutting process of the invention can also advantageously be carried out on a conventional press, or better, of a slow motion depending on the impulse rate and thickness of the material under processing.
  • the process can be carried out both on blanks of the material as well as on strips, straps, partly machined pieces, wire etc., without any problem.
  • the entire process is independent of the direction of the feeding motion or the orientation of the fibers, and may use a zigzag feeding to save on the material or interlock the forms to reduce the material scraps to a minimum.
  • Figures 2, 2a, 2b and 2c show a second embodiment of the process of the invention.
  • a radiated zone 23 is also noted in this case.
  • Figure 2b presents a further variant, in which the matrix 12 is fitted with a radiated edge 24 in the part facing the punch.
  • This radiated edge 24 should have the function of improving the finishing of the surface generated by the cut with a fresh edge, as previously illustrated in Figure 2a.
  • Figure 2c shows yet another variant, again designed to improve the surface finishing, in which the matrix 12 is fitted with an edge with a sloping surface 25 in the part facing the punch.
  • FIGS 3, 3a and 3b illustrate a third embodiment of the process of the invention.
  • the first phase is entirely similar to that of the foregoing Figures 1 and 2, and is shown in Figure 3.
  • the third subsequent phase shown in Figure 3b illustrates a further finishing phase, which is delayed with respect to the previous phases, but allows achieving a complete detachment of the scrap 28, as indicated in the figure in its initial position by a dashed area 27.
  • FIGS 4, 4a, 4b and 4c now illustrate a fourth embodiment of the process of the invention.
  • this first phase of Figure 4 creates a piece 10 having the same areas described in Figure 1 and an identical gap between the matrix and the punch.
  • FIGS 4b and 4c illustrate the same arrangements as those in Figures 2b and 2c.
  • Figure 4b shows the matrix 12 fitted with a radiated edge 24 in the part in which the first engagement with the piece 10 occurs.
  • Figure 4c shows the matrix fitted with an edge having a sloping surface 25 in the part in which it engages with the underlying part 10 during the cutting process.
  • Figures 5, 5a and 5c illustrate a series of three phases similar to those shown in Figures 3, 3a and 3b.
  • the first phase shown in Figure 5 is identical to the first phase of Figure 4, in which an upside down arrangement with respect to the matrix 12 and the punch 13 is shown. In fact both act from sides opposite those of the previous cases, both on the piece 10 as on the scrap and the other piece 11.
  • Figure 5a shows that there cannot be a complete cut if the scrap 27 is not detached, and that the second phase of cutting occurs without a complete compenetration between the matrix 12 and the punch 13.
  • the third successive phase shown in Figure 5b shows the final finishing operation, which is delayed with respect to the previous operations, but allow to achieve a complete detachment of the scrap 28. Even in this case, Figure 5b indicates the scrap 28 in its initial position as a dashed area 27.
  • phases may be applied on a single raw piece or on a sheet with pieces tied to the strip composing it.
  • the phases may both be continuous and alternating with other operations undertaken on the piece.
  • the process of the invention is applicable in a particularly advantageous manner and the pieces are moved in an automatic manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turning (AREA)
  • Punching Or Piercing (AREA)
EP98200758A 1997-03-12 1998-03-10 Verfahren zum Stanzen von Metallteilen mit hohem Endbearbeitungsgrad Withdrawn EP0864384A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT97MI000538A IT1290051B1 (it) 1997-03-12 1997-03-12 Procedimento per tranciare pezzi metallici con elevata precisione di finitura
ITMI970538 1997-03-12

Publications (2)

Publication Number Publication Date
EP0864384A2 true EP0864384A2 (de) 1998-09-16
EP0864384A3 EP0864384A3 (de) 2001-05-30

Family

ID=11376371

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98200758A Withdrawn EP0864384A3 (de) 1997-03-12 1998-03-10 Verfahren zum Stanzen von Metallteilen mit hohem Endbearbeitungsgrad

Country Status (2)

Country Link
EP (1) EP0864384A3 (de)
IT (1) IT1290051B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090010723A1 (en) * 2006-02-03 2009-01-08 Willi Grimm Method and Tool for the Precision Cutting of Workpieces with Small Corner Radii and Greatly Reduced Draw-In in a One-Stage Arrangement
AT525435A4 (de) * 2021-10-29 2023-04-15 Hrach Thomas Verfahren und Vorrichtung zum Herstellen eines kalibrierten Stanzteiles
EP4173736A4 (de) * 2020-06-30 2023-12-20 JFE Steel Corporation Blechscherverfahren, verfahren zur herstellung einer gepressten komponente, blech und schermatrize für blech

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0428427A (ja) * 1990-05-18 1992-01-31 Honda Motor Co Ltd 剪断金型
JPH0615381A (ja) * 1992-07-01 1994-01-25 Nakamura Seisakusho Kk 板状材料のせん断方法
JPH07178475A (ja) * 1993-12-24 1995-07-18 Yutaka Giken Co Ltd 剪断加工方法及び増肉剪断金型

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0428427A (ja) * 1990-05-18 1992-01-31 Honda Motor Co Ltd 剪断金型
JPH0615381A (ja) * 1992-07-01 1994-01-25 Nakamura Seisakusho Kk 板状材料のせん断方法
JPH07178475A (ja) * 1993-12-24 1995-07-18 Yutaka Giken Co Ltd 剪断加工方法及び増肉剪断金型

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
FLIMM, JOSEPH: "Spanlose Formgebung" 1984 , CARL HANSER , MUNICH, VIENNA XP002163342 * page 286-287 * * page 292-293 * *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090010723A1 (en) * 2006-02-03 2009-01-08 Willi Grimm Method and Tool for the Precision Cutting of Workpieces with Small Corner Radii and Greatly Reduced Draw-In in a One-Stage Arrangement
US10022770B2 (en) * 2006-02-03 2018-07-17 Feintool International Holding Ag Method and tool for precision cutting
EP4173736A4 (de) * 2020-06-30 2023-12-20 JFE Steel Corporation Blechscherverfahren, verfahren zur herstellung einer gepressten komponente, blech und schermatrize für blech
AT525435A4 (de) * 2021-10-29 2023-04-15 Hrach Thomas Verfahren und Vorrichtung zum Herstellen eines kalibrierten Stanzteiles
AT525435B1 (de) * 2021-10-29 2023-04-15 Hrach Thomas Verfahren und Vorrichtung zum Herstellen eines kalibrierten Stanzteiles
WO2023072765A1 (de) * 2021-10-29 2023-05-04 Thomas Hrach Verfahren und vorrichtung zum herstellen eines kalibrierten stanzteiles

Also Published As

Publication number Publication date
EP0864384A3 (de) 2001-05-30
ITMI970538A1 (it) 1998-09-12
IT1290051B1 (it) 1998-10-19

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