US20130061728A1 - Draw punch and method of making different shaped cutouts - Google Patents

Draw punch and method of making different shaped cutouts Download PDF

Info

Publication number
US20130061728A1
US20130061728A1 US13/699,713 US201113699713A US2013061728A1 US 20130061728 A1 US20130061728 A1 US 20130061728A1 US 201113699713 A US201113699713 A US 201113699713A US 2013061728 A1 US2013061728 A1 US 2013061728A1
Authority
US
United States
Prior art keywords
draw punch
die
slug
work piece
draw
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.)
Abandoned
Application number
US13/699,713
Other languages
English (en)
Inventor
K.N. Prabakar
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 US20130061728A1 publication Critical patent/US20130061728A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/34—Perforating tools; Die holders
    • B21D28/343—Draw punches
    • 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
    • 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
    • Y10T83/929—Tool or tool with support
    • Y10T83/9411—Cutting couple type
    • Y10T83/9423—Punching tool
    • Y10T83/9425—Tool pair

Definitions

  • the invention relates generally to a draw punch and more specifically to a punch and a die for making different shaped cutouts on a work piece and for removing slug from the work piece like sheet metal and the like.
  • Metal working methods involve several techniques like punching, coining, bending, and several other ways of modifying metal raw material to yield the desired shapes.
  • punching typically a punch press is used to push a punch through a material and into a die to create a hole or a cutout in the workpiece.
  • a scrap slug from the hole is deposited into the die in the process.
  • this slug may be recycled and reused or discarded.
  • the different cutouts shapes that are desirable include both round and non-round shapes like square, oval, elongated rectangular and trapezoidal openings, for example, to receive connector sockets in computer housings, and punches have been developed to meet these applications.
  • the hole walls usually are not neatly cut and show burnished area, rollover, and cause die break and must often be further processed.
  • the slug usually causes a jam when the punch is being removed from the die after the cutting process, and removal of the slug from the die is often difficult and time-consuming.
  • another tool such as a screw driver is used to free the punched slugs.
  • the threads on the bolts used to align the work piece, die and punch are damaged and need to be replaced frequently. Further the punch may itself break while the slug is being removed from the die.
  • Splitter punch is one technique which attempts to address the slug removal problem to some extent by splitting the slug during the cutting process so that it breaks into smaller pieces and can be removed easily.
  • U.S. Pat. No. 4,905,557 discloses one such splitter punch that includes peripheral cutting edges and lateral cutting edges.
  • the peripheral edges of the punch cut a slug in the desired shape, while the lateral edges cut transversely from one peripheral edge to an opposite peripheral edge, thereby splitting the slug.
  • Lateral cutting edges and peripheral cutting edges at their juncture provide pyramidal cutting sections which initially pierce the workpiece and initiate lateral slug splitting. This split grows from the slug periphery toward the center. Splitting is complete before a substantial portion of the slug periphery is cut.
  • the split type punches address the slug removal problem to some extent, it is desirable that the slug is not split so that it can be used for some other applications.
  • the invention provides a draw punch assembly for making one or more desired cutouts in a work piece.
  • the draw punch assembly includes a draw punch with a peripheral cutting edge on an outer surface and a bending edge on an inner surface, and a die with a shaped cavity for receiving a slug, where the slug is a cutout portion of the work piece.
  • the die and the draw punch maintain a pre-defined clearance with respect to each other during operation.
  • the invention provides a method for making one or more desired cutouts in a work piece.
  • the method includes providing the draw punch assembly as disclosed herein above, aligning the draw punch, the work piece, and the die; moving the draw punch towards the die; shearing the work piece by the draw punch to yield the one or more desired cutouts and a slug; bending a slug to obtain bended slug during the shearing; and receiving the bended slug in the shaped cavity of the die.
  • FIG. 1 is a diagrammatic representation of an exemplary embodiment of the draw punch assembly for making a round shaped cutouts
  • FIG. 2 and FIG. 3 are different views of the draw punch assembly of FIG. 1 ;
  • FIG. 4 is a diagrammatic representation of an exemplary embodiment of the draw punch assembly for making square shaped cutouts
  • FIG. 5 and FIG. 6 are different views of the draw punch assembly of FIG. 4 ;
  • FIG. 7 is a diagrammatic representation of a flypress adaptation of the draw punch assembly of FIG. 1 ;
  • FIG. 8 is a diagrammatic representation of a flypress adaptation of the draw punch assembly of FIG. 4 .
  • a work piece is a sheet metal piece including a fabricated and powder coated readymade panel.
  • a draw punch is a machine tool used to cut holes in a work piece.
  • the draw punch as used herein includes a manually operated hand tool and a flypress adaptation.
  • a die is a specialized tool that is a counterpart for the draw punch used cut a work piece, the die is customized to the shape of the desired cutouts.
  • a slug is a cutout portion of the work piece, usually treated as scrap or waste or may be recycled.
  • An exemplary embodiment includes a draw punch assembly for making one or more desired cutouts in a work piece.
  • the draw punch assembly includes a draw punch with a peripheral cutting edge on an outer surface and a bending edge on an inner surface.
  • the dimensions and configuration of the said draw punch are predetermined to get the exact required dimensions in the cutout so that there is no need for further rework which is usually a big disadvantage in the prior art draw punches.
  • the dimensions of the draw punch can be configured for making different standard size of cutouts by proper nesting with the help of the auto cad drawing printouts and templates.
  • the draw punch assembly further includes a die with a shaped cavity for receiving the slug.
  • the die and the draw punch maintain a pre-defined clearance with respect to each other as the draw punch is slowly moved closer to the die.
  • the shape of the cutting edge and the bending edge of the draw punch and the clearance between the draw punch and the die enables the slug portion of the work piece to slowly shear and bend and helps in pushing the slug into the shaped cavity of the die.
  • the clearance between draw punch and the die is obtained by accommodating very close tolerance between a bolt that is used to align the draw punch, die and work piece, and the draw punch.
  • peripheral cutting edge and the bending edge of the draw punch bends the slug in the cutting process so that it does not jam inside the cavity of the die.
  • the slug is a single piece like a washer with a center hole.
  • the draw punch assembly can be configured and dimensioned to cover different shaped cutouts, for example, but not limiting to standard square/rectangular cutouts dimensions like 45 ⁇ 45 mm 45 ⁇ 92 mm 92 ⁇ 92 mm, 33 ⁇ 33 mm, 68 ⁇ 68 mm and 135 ⁇ 135 mm or around dimension like 16 mm, 19 mm, 22.5 mm, 29.5 mm and 31.5 mm can be easily made so that most of the digital and analog, electric and electronics meters, PG glands, push buttons, lamps can be easily fitted with these cutouts, without any scratches on the surface either on the instrument or on the panel surface.
  • FIG. 1 An exemplary embodiment of the draw punch assembly 10 as a circular assembly for making a round shaped cutout is shown in FIG. 1 .
  • the circular draw punch 12 has a peripheral cutting edge 14 on an outer surface 16 and a bending edge 18 on an inner surface 20 .
  • the circular assembly further comprises a circular die 22 with a circular shaped cavity 24 , also sometimes referred to as slug cavity, a bearing 26 and a bolt 28 .
  • the bolt 28 along with bearing 26 ensures smooth rotation of the draw punch so that axial force can be applied to the draw punch to cut the work piece smoothly, slowly and steadily.
  • Cutting edge of the punch enables the slug portion of the cutout to bend and make to fall towards the shaped cavity of the die.
  • FIG. 2 and FIG. 3 show a front view 30 and a side view 32 respectively for the circular assembly of FIG. 1 .
  • FIG. 4 is another exemplary embodiment of the draw punch assembly 34 for non circular cutouts.
  • the cutouts needed are non-round, for example square, oval, elongated rectangular and trapezoidal openings for installation of electrical meters and process meters, MCB's, cooling fans especially on powder coated wired panels i.e. after bending and powder coating of panels.
  • the exemplary embodiment 34 is shown for square shaped cutouts, and those skilled in the art will understand that the same principles can be used for fabricating draw punch assembly for other non-circular shapes like rectangular, oval, trapezoidal etc.
  • the non circular assembly 34 includes a non-circular draw punch 36 , for example a square shaped draw punch with a peripheral cutting edge 38 on an outer surface 40 and a bending edge 42 on an inner surface 44 .
  • a non-circular draw punch 36 for example a square shaped draw punch with a peripheral cutting edge 38 on an outer surface 40 and a bending edge 42 on an inner surface 44 .
  • the non circular draw punch assembly further includes guide pins 46 , which help to slide the draw punch 36 along the guide pins to move it closer to a non circular die 48 .
  • the die 48 is square shaped with a square shaped cavity 50 .
  • the die and shaped cavity will be of the corresponding shapes.
  • Other components of the non circular assembly include a guide pin mounting plate 52 , screws 54 for attaching the guide pin mounting plate with the die, bearing 56 , bolt 58 and dowel 60 to help in aligning the different components of the draw punch assembly.
  • Guide pins in the die helps to slide the draw punch so that it ensures equal clearance, which is allows for smooth cutting to avoid any misalignment between the die and the draw punch.
  • the draw punch 36 and die 48 are axially aligned with the work piece (not shown) located there between, and the draw punch 36 and die 48 are brought closer and closer together with the help of guide pins 46 until the punch is tightened to the work piece.
  • the work piece is sheared by cutting edge 38 of the draw punch 36 .
  • the draw punch 36 moves closer to a correspondingly shaped cavity 50 of the die 48 , the curved shape or the bending edge 42 of the draw punch 36 bends the slug after cutting, so that it falls easily into the shaped cavity 50 of the die.
  • a particular working embodiment of the invention includes legs 62 , which comprises radial bending surface 64 and the cutting edge 38 is U-shaped and one side 66 of the U-shape of the draw punch is deeper compared to other side 68 which enables much lesser punching force at the end of the cutting and also it enables more bending of the slug for easy removal from the shaped cavity.
  • the radial inner surface 66 of the legs 62 of the draw punch 38 are set to an angle transverse to the direction of the punch motion, and not perpendicular. This further facilitates the bending of the slug while cutting and also reduces the required punching force by providing localizing cutting rather than cutting around entire periphery simultaneously.
  • the peripheral edges cuts a slug in a desired shape for ex: rectangular, square, trapezoidal, circular etc., and the bending surface bends the slug part transversely from one corner from the corner of the slug there by makes the slug bend according to the curvature of the inner radial surface of legs of draw punch.
  • the present embodiments of the invention reduce punch force requirements, provide a clean cutout and a readily removable bended slug. This is in contrast with the prior art draw punch tools where the cutting edge causes undesirable high force requirements when applied to non round openings for punching.
  • the cutting edges cut right angle patterns onto the work piece, to initially pierce the work piece and bend the slug, this bending of slug grows from corners of the legs towards the center of the draw punch. This priority cutting arrangements assures that, the slug is adequately supported at the periphery while it is being bended.
  • equal clearance is provided between die and draw punch which helps in equal distribution of shearing force along the four sides of the square/rectangular cutouts.
  • FIG. 5 and FIG. 6 show a front view 70 and a side view 72 respectively for the non-circular assembly of FIG. 4 .
  • the die and draw punch may be fabricated from a special alloy tool steel to get excellent edge holding properties, abrasion resistance and dimensional stability. High working hardness of the die and draw punch may result in the slight wearing out of the guide pins and bolts while sliding, but this will not affect the tool life since only the bolts and guide pins are the wear out parts, and are easily replaceable.
  • Some specific embodiments include draw punches as hand tools and other embodiments working as fly press on the same principles.
  • the hand tool version of the draw punch as disclosed herein do away with the need for any electric or pneumatic drive attached to the operation so that even an ordinary layman can easily use this tool safely without any risk even at the site.
  • embodiments of the draw punch assembly as disclosed herein may also be adapted as flypress versions that will allow for making multiple cutouts with ease and efficiency.
  • FIG. 7 and FIG. 8 show the flypress versions for a circular draw punch assembly 74 and a non circular draw punch assembly 77 . Additional components like springs 78 , and support plates 80 and 82 are additionally provided for these embodiments.
  • the different embodiments of the invention are advantageous for making different shaped cutouts on work pieces, and for bending the slug which falls free in the shaped cavity of the die. Further these embodiments require low operative force and ensure extended life of the draw punch and its components.
  • the different embodiments are useful for electrical contractors, electrical panel fabricators, special purpose machines manufacturers, automation industry, retrofitting for the running machines, maintenance depts. and other electrical and electronics related works.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
US13/699,713 2010-05-28 2011-05-25 Draw punch and method of making different shaped cutouts Abandoned US20130061728A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IN1478CH2010 2010-05-28
IN1478CHE/2010 2010-05-28
PCT/IN2011/000367 WO2011148393A1 (fr) 2010-05-28 2011-05-25 Poinçon de traçage et procédé de réalisation de découpes de formes différentes

Publications (1)

Publication Number Publication Date
US20130061728A1 true US20130061728A1 (en) 2013-03-14

Family

ID=45003419

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/699,713 Abandoned US20130061728A1 (en) 2010-05-28 2011-05-25 Draw punch and method of making different shaped cutouts

Country Status (2)

Country Link
US (1) US20130061728A1 (fr)
WO (1) WO2011148393A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111597597A (zh) * 2020-05-11 2020-08-28 内蒙古京泰发电有限责任公司 一种pdms天圆地方结构体设备模型的创建方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019119849A1 (de) 2019-07-23 2021-01-28 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Werkzeug und Verfahren zum Bearbeiten von plattenförmigen Werkstücken

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1524315A (en) * 1977-02-24 1978-09-13 Brent Components Ltd Cutting holes in sheet material
SU1310076A1 (ru) * 1986-01-06 1987-05-15 Днепропетровский химико-технологический институт им.Ф.Э.Дзержинского Штамп совмещенного действи
CN87102025A (zh) * 1987-05-16 1988-12-07 文先忠 边冲裁边弯曲的冲压方法
JP2002001456A (ja) * 2000-06-19 2002-01-08 Hirotec Corp プレス成形装置
CN201040304Y (zh) * 2007-04-05 2008-03-26 周振强 旋耕机刀具成型机

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111597597A (zh) * 2020-05-11 2020-08-28 内蒙古京泰发电有限责任公司 一种pdms天圆地方结构体设备模型的创建方法

Also Published As

Publication number Publication date
WO2011148393A1 (fr) 2011-12-01

Similar Documents

Publication Publication Date Title
WO2010150743A1 (fr) Dispositif de retrait de chutes de découpage et monture de lame pour découpeuse à l'emporte-pièce
WO2008128226A1 (fr) Procédé et appareil permettant d'effectuer des déplacements de commande de flexion dans un matériau en feuille
US20130061728A1 (en) Draw punch and method of making different shaped cutouts
CN104002334A (zh) 冲压模具
JP2009208948A (ja) フレーム付きテークアップユニット
WO2009125786A1 (fr) Procédé de cisaillage
KR20210115531A (ko) 인서트 교체사용구조를 갖는 프레스장치용 압착 펀치
CN209094333U (zh) 一种组合式刀模弯曲装置
JP2000317544A (ja) プレス加工装置およびプレス加工方法
CN207839737U (zh) 一种冲裁模架
CN110976610A (zh) 一种具有梳齿结构的工件的冲裁设备以及冲裁方法
JP3147993U (ja) プレス曲げ型
JP2006346687A (ja) プレス順送金型装置およびモータ又はイグニッション用のコア
EP2913120B1 (fr) Outil d'ébarbage
CN103846339A (zh) 一种冲压模具
CN215941261U (zh) 一种通用压桥位模具
CN220112008U (zh) 一种钣金件加工折弯装置
JP2019181520A (ja) プレス加工装置
CN216096556U (zh) 一种钻排余料多功能定位夹紧装置
CN218591569U (zh) 一种用于柱状零件由外向内打孔的工装
CN214814030U (zh) 一种u形冲头
US10987716B2 (en) Press die
JP2008213019A (ja) 薄板打抜き加工方法及び打抜き加工装置
CN102029309A (zh) 轴类工件纵向v槽的冲压加工方法
KR20070026028A (ko) 트리밍 가공 장치의 스크랩 커터 및 그 절단 방법

Legal Events

Date Code Title Description
STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION