Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B51/00—Tools for drilling machines
  • B23B51/0081—Conical drills
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
  • B23B41/04—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor for boring polygonal or other non-circular holes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2215/00—Details of workpieces
  • B23B2215/72—Tubes, pipes
• • 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
  • Y10T408/00—Cutting by use of rotating axially moving tool
  • Y10T408/55—Cutting by use of rotating axially moving tool with work-engaging structure other than Tool or tool-support
  • Y10T408/564—Movable relative to Tool along tool-axis
• • 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
  • Y10T408/00—Cutting by use of rotating axially moving tool
  • Y10T408/91—Machine frame
  • Y10T408/93—Machine frame including pivotally mounted tool-carrier
• • 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
  • Y10T409/00—Gear cutting, milling, or planing
  • Y10T409/30—Milling
  • Y10T409/303752—Process
  • Y10T409/303808—Process including infeeding
• • 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
  • Y10T409/00—Gear cutting, milling, or planing
  • Y10T409/30—Milling
  • Y10T409/306216—Randomly manipulated, work supported, or work following device
  • Y10T409/306384—Randomly manipulated, work supported, or work following device with work supported guide means
• • 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
  • Y10T409/00—Gear cutting, milling, or planing
  • Y10T409/30—Milling
  • Y10T409/306216—Randomly manipulated, work supported, or work following device
  • Y10T409/306384—Randomly manipulated, work supported, or work following device with work supported guide means
  • Y10T409/30644—Randomly manipulated, work supported, or work following device with work supported guide means to guide tool to move in arcuate path
• • 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
  • Y10T409/00—Gear cutting, milling, or planing
  • Y10T409/30—Milling
  • Y10T409/306664—Milling including means to infeed rotary cutter toward work
  • Y10T409/30756—Machining arcuate surface
• • 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
  • Y10T409/00—Gear cutting, milling, or planing
  • Y10T409/30—Milling
  • Y10T409/306664—Milling including means to infeed rotary cutter toward work
  • Y10T409/307672—Angularly adjustable cutter head

Definitions

• the present invention relates to a method for making an elongated hole in a pipe by means of a rotating conical tool.
• One implementation of the method is commenced such that, in a first sequence, a conical tool is used for drill ⁇ ing through the wall of a pipe by pushing the conical tool in the direction of its rotating axis to a desired depth, which determines the width of a finished hole.
• the edges of said collar can be brought closer to level if the hole is made elongated in the longitudinal direction of the pipe. It is prior known to operate a conical tool such that the hole edges are defined according to an intersecting line between the conical sur ⁇ face and the cylindrical surface, the hole having a degree of ellipticity which depends on the ratio between the diame ⁇ ter of the pipe and the minor diameter of the hole.
• An object of the invention is to provide an improved method and apparatus which enable the selection of a ratio between the length and width of a hole more freely than before by means of a simple mechanism.
• a further benefit offered by the method is the adaptability to various wall thicknesses and pipe materials.
• figs. 2A and B depict the implementation of a second se- quence of the method
• figs. 3A and B depict the implementation of a third sequence of the method:
• figs. 4A and B show an apparatus according to a first em ⁇ bodiment of the invention for controlling the ac ⁇ tions of a conical drill;
• figs. 5A and B show an apparatus according to a second em- bodiment of the invention for controlling the ac ⁇ tions of a conical drill and
• fig. 6 illustrates the actions of a conical drill in an alternative method of the invention.
• the method is carried out with a conically shaped tool 1 , having a conical surface which is provided with bits 1a on diametrally opposite sides thereof.
• the conical drill 1 is rotated around a centre axis 2.
• the rotating axis 2 extends through a pipe centre axis 6.
• the conical drill 1 is used to drill through the wall of a pipe P to a desired depth. This results in a hole 3, having a width which corre ⁇ sponds to that of a finished hole. Thus, the drilling depth determines the width of a hole.
• the conical bit 1 is pushed in the direction of the rotating axis 2.
• the conical bit 1 is tilted relative to a pivot point 5a located above the top pipe surface. The pivot point 5a is offset from a mid-line 4 in the direction of tilting. Upon tilting, the conical drill 1 rises upward and moves forward in the longitudinal direction of a pipe.
• the rotating conical drill 1 mills one end 3.1 of an elliptical hole into the shape shown in fig. 2.
• the adjust ⁇ ment of an angle of inclination ⁇ of the drill 1 can be used for determining the length of a finished hole in relation to the width thereof.
• the conical drill 1 is first returned to an initial position corresponding to fig. 1, wherein the axis 2 coincides with the mid-line 4. This is followed by effecting a corresponding lift and concurrent tilting about a pivot point 5b in the opposite direction, the conical drill 1 milling the other end 3.2 of the ellip ⁇ tical hole.
• the same tool can be used for making holes of varying sizes and degrees of ellipticity since the first-sequence drilling depth and the second- and third-sequence angle of inclina ⁇ tion are selectable or adjustable.
• degree of ellipticity is intended to refer to a hole of any elongated shape, having curved end edges but possibly also linear edge portions.
• Figs. 4A and 4B illustrate an apparatus according to a first embodiment for carrying out the above-described method.
• the apparatus includes a drive unit 7 provided with a rotating shaft for carrying a conical drill 1.
• the drive unit 7 includes a housing 8 provided with supporting legs 9 extend ⁇ ing therefrom and movable in axial direction relative to the housing 8.
• the bottom ends of the supporting legs 9 are provided on either side of the drill 1 with brackets 10 which are fitted with journals 5a and 5b received in slots 12 included in brackets 11.
• the brackets 11 are secured to a base plate 13 which, in turn, is attached to clamping hoops 14 engageable around a pipe P.
• the elements 11, 13 and 14 are secured to the pipe P prior to making a hole.
• the tool 7, having its support ⁇ ing legs in an extended position is brought to the drilling site such that the journals 5a and 5b settle in the slots 12.
• This is followed by carrying out a drilling operation according to the above sequence 1 , whereby the supporting legs 9 slide inwards, the housing 8 approaches the pipe P and the conical drill 1 penetrates the pipe.
• the bracket 10 is fitted with a backstop 18 which determines a drilling depth as a sleeve included in the supporting leg 9 collides with the backstop 18.
• the vertical position of said backstop 18 is adjustable for adjusting the drilling depth.
• brack- et 10 is also inclined relative to the bracket 11.
• the inclination is limited by means of a pin 15, which is fitted in a slot 16 included in the bracket 11 and which collides with the floor of a slot 17 included in the bracket 10.
• the height of said limiting pin 15 can be adjusted for adjusting the angle of inclination.
• Figs. 5A and 5B illustrate an apparatus according to a second embodiment, the identical elements being designated with the same reference numerals as in figs. 4A and 4B.
• the brackets 11 are secured to a pipe P by means of a base frame 13 and elements 14 engaging around the pipe (the dash-and-dot line refers e.g. to a chain). Howev ⁇ er, the bracket 11 only includes a single slot 12' receiving a single pivot journal 5' on either side of the drilling axis.
• On the drilling axis is mounted a fitting element 20 with the chuck end of a conical drill 1 secured therein.
• the fitting element 20 is surrounded by a bushing 19, adapted to be non-rotatable but axially movable relative to the fitting element 20.
• the bushing 19 can be clamped e.g. with a screw 21 at a desired axial height relative to the fitting element 20.
• the conical drill 1 penetrates the pipe P to a de- sired depth
• the lower end surface of bushing 19 collides with the top surface of pipe P and, thus, determines the drilling depth. Tilting of the drill apparatus 7 results in a pivot point 5a' or 5b', sliding longitudinally of the pipe and located between the end edge of bushing 19 and the top surface of pipe P.
• the sup ⁇ porting legs 9 slide outwards and the pivot journals 5' can be locked to the floor of said slot 12'.
• the pivot journals 5' may rise within the slot 12'.
• the inclina ⁇ tion limiting pin 15 collides with a slanting wall 17 in- eluded in the slot of said bracket 10.
• the pin 15 can be secured at various heights within the slot 16 for adjusting the angle of inclination.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Drilling And Boring (AREA)
• Forging (AREA)
• Processing Of Stones Or Stones Resemblance Materials (AREA)
• Milling Processes (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Earth Drilling (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
• Punching Or Piercing (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8540865

Family Applications (1)

Country Status (10)

Cited By (2)

Families Citing this family (9)

Citations (4)

Family Cites Families (21)

• 1994
  • 1994-06-07 FI FI942671A patent/FI101612B/fi not_active IP Right Cessation
• 1995
  • 1995-06-07 WO PCT/FI1995/000325 patent/WO1995033591A1/en active IP Right Grant
  • 1995-06-07 DE DE69512234T patent/DE69512234T2/de not_active Expired - Lifetime
  • 1995-06-07 BR BR9508184A patent/BR9508184A/pt not_active IP Right Cessation
  • 1995-06-07 EP EP95920919A patent/EP0764068B1/en not_active Expired - Lifetime
  • 1995-06-07 ES ES95920919T patent/ES2136858T3/es not_active Expired - Lifetime
  • 1995-06-07 KR KR1019960706985A patent/KR100250410B1/ko not_active IP Right Cessation
  • 1995-06-07 JP JP50040796A patent/JP3553602B2/ja not_active Expired - Lifetime
  • 1995-06-07 AT AT95920919T patent/ATE184528T1/de not_active IP Right Cessation
  • 1995-06-07 US US08/750,463 patent/US5876161A/en not_active Expired - Lifetime

Patent Citations (4)

Non-Patent Citations (2)

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