EP0057039B1 - Fliessformbohrer zum Versehen von Blechmaterial mit Löchern - Google Patents

Fliessformbohrer zum Versehen von Blechmaterial mit Löchern Download PDF

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Publication number
EP0057039B1
EP0057039B1 EP82200068A EP82200068A EP0057039B1 EP 0057039 B1 EP0057039 B1 EP 0057039B1 EP 82200068 A EP82200068 A EP 82200068A EP 82200068 A EP82200068 A EP 82200068A EP 0057039 B1 EP0057039 B1 EP 0057039B1
Authority
EP
European Patent Office
Prior art keywords
drill
contour
polygon
provision
cross
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
Application number
EP82200068A
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English (en)
French (fr)
Other versions
EP0057039A1 (de
Inventor
Aloysius Joseph Hoogenboom
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.)
FLOWDRILL BV
Original Assignee
FLOWDRILL BV
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 FLOWDRILL BV filed Critical FLOWDRILL BV
Priority to AT82200068T priority Critical patent/ATE7368T1/de
Publication of EP0057039A1 publication Critical patent/EP0057039A1/de
Application granted granted Critical
Publication of EP0057039B1 publication Critical patent/EP0057039B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/063—Friction heat forging
    • B21J5/066—Flow drilling
    • 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
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • B21D31/02—Stabbing or piercing, e.g. for making sieves

Definitions

  • the invention relates to a flow drill for the provision through the intermediary of friction heat and pressure of a hole surrounded by a collar in metal sheet or metal tube walls, said drill having a shaft and a smooth tapering operative end, the cross-section of said operative end being based on a regular polygon and has a convex contour situated within the circle circumscribing the body hole.
  • the cross-section of the operative drill end is a square, having rounded apexes. It has been found, that such a drill is suitable for the provision of holes in the softer metals such as aluminum and copper or brass, but for the provision of holes in harder metals, such as bronze and steel offers not so good results and will wear already after having made a relatively small number of holes.
  • the flow drill according to the Dutch Patent 160499 is based in its shape of the cross-section of the operative part on an equilateral triangle, having apex radiusses comprising two arcs merging in the apex and having different radius of curvature and different length.
  • the contour likewise may be in the shape of an arc, but having a larger radius of curvature, or by a straight line.
  • the apexes of the triangle are too much accentuated due to said transitions in radius of curvature, whereby instability in the operation of the drill may occur, particularly if said drill is used for flaring tube ends. Thereby said ends are formed into a somewhat square instead of a circular shape.
  • the invention aims at providing an improved flow drill not having the above mentioned disadvantages.
  • the basic shape of the contour is a triangle. However, it may also be a square, pentagon or hexagon.
  • the embodiments preferred in practice are drills based on a square since their operational stability is greater than that of drills based on a triangle, while those drills based on a pentagon or hexagon too closely approximate the circular shape.
  • the drill may be ground in accordance with the contour according to the formula on a numerically controlled grinding machine.
  • the drill as shown has a first conical part 3, having a pointed centering portion 2, a prismatic second part 4, a collar 5 having a shoulder 6 and a shaft 7 by means of which the drill may be secured in a drilling machine head.
  • the drill according to the invention which is suitable for making holes in copper, aluminum, bronze and steel, may be used in both rotational directions, remains free of material growth or adhesion, with a maximum in stability and life and has an operative portion 3 and 4, the cross-section of which has the contour according to the formula, examples of which are shown in Fig. 2 and 3.
  • n the number of sides or apexes of the polygon on which the contour is based is indicated by n
  • e indicates the difference between the maximum and the minimum value of the radius vector R in the relative contour
  • 8 indicates the so called modulation factor and determines the radius angle in the points of the curve.
  • 8 is usually between 0 and 0.9.
  • a is the so-called non-symmetry factor. If a is not equal to 0, the contour is composed of n equal parts each being non-symmetrical relative to the radius vector, situated between both end points from that contour part.
  • the left column of contours as shown in Fig. 3 is relative to contours based on a triangle, the right column shows contours based on a square.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)
  • Laminated Bodies (AREA)

Claims (1)

1. Flieszbohrer zur Herstellung eines Lochs in einem Blech oder in Metallrohrwanden, welches Loch von einem Kragen umgeben ist, und mittels Reibungserhitzung und Druck dargestellt wird, welcher Bohrer eine Schaft und ein glattes kegeliges wirksames Ende aufweist von welchem wirksamen Ende der Querschnitt auf einem regelmässigen Vieleck basiert ist und ein konvexes Profil aufweist, welches Profil innerhalb des den Vieleck umschreibenden Kreises liegt, dadurch gekennzeichnet, dass das Profil des Querschnitts durch den folgenden Formel dargestellt wird:
Figure imgb0005
worin für die Lösungen für R(φ) die Bedingung gilt dass:
Figure imgb0006
worin R = der Radiusvector vom Bohrermittelpunkt aus ist, Ro = der Radiusvector in einem Anfangspunkt des Profils in einem der Winkelpunkte des Vielecks ist, = der Winkel zwischen R und Ro ist, e = Rmax ―Rmin, n = der Zahl der Winkelpunkte des Vielecks ist, 8 = ein Modulationsfaktor und a eine a-Symmetriefaktor ist.
EP82200068A 1981-01-22 1982-01-19 Fliessformbohrer zum Versehen von Blechmaterial mit Löchern Expired EP0057039B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82200068T ATE7368T1 (de) 1981-01-22 1982-01-19 Fliessformbohrer zum versehen von blechmaterial mit loechern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8100304A NL8100304A (nl) 1981-01-22 1981-01-22 Vloeiboor voor het maken van gaten in plaatmateriaal.
NL8100304 1981-01-22

Publications (2)

Publication Number Publication Date
EP0057039A1 EP0057039A1 (de) 1982-08-04
EP0057039B1 true EP0057039B1 (de) 1984-05-09

Family

ID=19836903

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82200068A Expired EP0057039B1 (de) 1981-01-22 1982-01-19 Fliessformbohrer zum Versehen von Blechmaterial mit Löchern

Country Status (4)

Country Link
EP (1) EP0057039B1 (de)
AT (1) ATE7368T1 (de)
DE (1) DE3260137D1 (de)
NL (1) NL8100304A (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3470856D1 (en) * 1984-01-30 1988-06-09 Flowdrill Bv Flowdrill, particularly adapted to be used in a hand drilling machine
GB2227536A (en) * 1988-11-22 1990-08-01 Stott Benham Limited Gas distribution tube
BE1009332A3 (nl) * 1995-04-26 1997-02-04 Bekaert Sa Nv Holle paal met daarbijbehorend bevestigingselement.
US5725698A (en) * 1996-04-15 1998-03-10 Boeing North American, Inc. Friction boring process for aluminum alloys
FR2850889B1 (fr) * 2003-02-07 2006-03-24 Inter Meca Dispositif utilise pour l'ogivage, le fluotournage, ou le fluopercage de pieces metalliques de section ronde et/ou ovoide
DE102004045265B4 (de) * 2004-09-11 2006-08-31 Institut für Füge- und Oberflächentechnik GmbH Verfahren und Vorrichtung zur Verbindung mindestens zweier flächiger Werkstücke
DE102006034585A1 (de) * 2006-07-26 2008-01-31 Ejot Gmbh & Co. Kg Loch- und gewindeformende Schraube
RU2335370C2 (ru) * 2006-10-30 2008-10-10 Государственное образовательное учреждение высшего профессионального образования "Алтайский государственный технический университет им. И.И. Ползунова" (АлтГТУ) Инструмент для пластического сверления
CN101269391A (zh) * 2007-03-21 2008-09-24 鸿富锦精密工业（深圳）有限公司 具有翻边孔的成型件及其加工方法
RU2492972C2 (ru) * 2010-11-09 2013-09-20 Государственное образовательное учреждение высшего профессионального образования Самарский государственный технический университет Инструмент для формирования отверстий методом пластического сверления
US12415192B2 (en) 2021-04-20 2025-09-16 Texas Transland LLC Stainless steel spray boom for aerial spraying

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL160499C (nl) * Geffen Tech Adviesbureau Bv Doorn voor het maken van een door een kraag omgeven gat in een metalen plaat of wand van een metalen buis.
FR1189384A (fr) * 1957-12-31 1959-10-02 Houilleres Bassin Du Nord Procédé et outil de formation de collets, et collets résultant de ce procédé
US3195156A (en) * 1961-06-27 1965-07-20 Res Engineering And Mfg Inc Method of producing thread swaging devices
NL160499B (nl) * 1974-11-28 1979-06-15 Geffen Tech Adviesbureau Bv Doorn voor het maken van een door een kraag omgeven gat in een metalen plaat of wand van een metalen buis.

Also Published As

Publication number Publication date
DE3260137D1 (en) 1984-06-14
ATE7368T1 (de) 1984-05-15
EP0057039A1 (de) 1982-08-04
NL8100304A (nl) 1982-08-16

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