EP0000943B1 - Vorrichtung zur Herstellung von durchgehenden Bohrungen in Metallblöcken - Google Patents

Vorrichtung zur Herstellung von durchgehenden Bohrungen in Metallblöcken Download PDF

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Publication number
EP0000943B1
EP0000943B1 EP19780100737 EP78100737A EP0000943B1 EP 0000943 B1 EP0000943 B1 EP 0000943B1 EP 19780100737 EP19780100737 EP 19780100737 EP 78100737 A EP78100737 A EP 78100737A EP 0000943 B1 EP0000943 B1 EP 0000943B1
Authority
EP
European Patent Office
Prior art keywords
punch
block
die
fact
head
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
EP19780100737
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0000943A1 (de
Inventor
Sebastiano Poggio
Pietro Quercini
Ettore Bianchettin
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.)
VERRINA SpA
Original Assignee
VERRINA SpA
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 VERRINA SpA filed Critical VERRINA SpA
Publication of EP0000943A1 publication Critical patent/EP0000943A1/de
Application granted granted Critical
Publication of EP0000943B1 publication Critical patent/EP0000943B1/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
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/025—Special design or construction with rolling or wobbling dies
    • 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
    • B21J5/10—Piercing billets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/04—Piercing presses

Definitions

  • the invention relates to a device for producing through bores in metal blocks, in particular steel blocks with a round cross section, with a block receiving die which is adapted to the outer shape of the metal block and which has a displaceable, retractable with the release of a punch opening in its base, which is to be produced coaxially to that in the metal block Bore arranged counter punch and a coaxial to this counter punch is assigned by a hydraulic press cylinder into the metal block enclosed in the block receiving die, which bears at its front free end facing the block receiving die, a flat, conical driving head on the front side.
  • a hydraulic press cylinder into the metal block enclosed in the block receiving die, which bears at its front free end facing the block receiving die, a flat, conical driving head on the front side.
  • the punch is loaded with the drive head only in the axial direction and pushed through the metal block with a simple longitudinal movement.
  • the production of the hole in the metal block requires a rather large pressing force.
  • the wobble drive on a cone-shaped drive would have to be used to wobble the drive head Surface are moved, the tip of which coincides with the tip of the conical driving head.
  • the punch should have a significantly smaller diameter than the driving head or than the hole to be made in the metal block.
  • the diameter of the punch should decrease with increasing length of the hole to be made.
  • a reduction in the drill punch diameter is only possible to a very limited extent in the devices of the type mentioned at the outset, since the drill punch also has to exert significant axial pressure on the driving head and is therefore exposed to a large buckling load. If the wobbling drive of the drive head known from the flow deformation of workpieces is to be transferred to the device for producing bores in metal blocks described at the outset and thereby achieved in a manner known per se by a corresponding rotary movement of the drill ram on a conical surface, this device could only be used for the production of very wide or flat holes are used and would have a very limited application.
  • the object of the invention is to achieve the advantageous wobble movement of the driving head which reduces the contact pressure in a device of the type described at the outset with particularly simple structural means and without a substantial reduction in the diameter of the ram compared to the diameter of the bore to be produced, and consequently the production of any narrow or long bores with the help of the tumbling drive head.
  • the drill bit can be driven circumferentially about its longitudinal axis and in that the driving head is freely rotatably mounted in the drill bit about an axis of rotation slightly inclined to the longitudinal axis of the drill bit and with a rear sliding surface directed obliquely to the longitudinal axis of the drill bit a corresponding obliquely directed pressure surface of the punch is present.
  • the favorable wobble movement of the conical driving head is achieved in a device of the type described in the introduction by a simple rotary movement of the drill ram about its longitudinal axis.
  • the diameter of the ram therefore only needs to be slightly narrower than the diameter of the driving head or the bore to be produced and is independent of the depth of the bore. As a result, it is possible to produce very deep or very long through holes in metal blocks.
  • 1 is a metal block, in particular a steel block, which has a circular cylindrical outer shape, i.e. is designed as a round block and with a coaxial, i.e. center, also cylindrical, through hole 101 is to be provided.
  • the metal block 1 is designed in a manner that matches its external shape, i.e. cylindrical interior of a tubular block receiving die 2 composed of two die halves 102, 202 included.
  • the tubular block receiving die 2 is non-rotatable but axially displaceable by means of sliding rollers in a box-shaped die holder 3, which consists of a lower, fixed die holder half 203 and an upper die holder half 103 which can be opened about the axis 5.
  • a particularly good, non-rotatable, axially displaceable guidance of the block receiving die 2 in the die holder 3 is achieved in that the block receiving die 2 has a non-circular, in particular polygonal, e.g. has hexagonal outer profile.
  • the two holder halves 103 and 203 are each equipped on their inside with two flat sliding roller tables 4, which are directed at an angle to one another and parallel to an outer, flat, longitudinal sliding surface of the block receiving die 2.
  • the two-part, box-shaped die holder 3 is closed and opened with the aid of at least one hydraulic locking cylinder 6.
  • This lock cylinder 6 is e.g. pivoted about the axis 7 on the lower die holder half 203, while its piston rod in 8 is articulated on the upper die holder half 103.
  • Each locking and tensioning device consists of a hydraulic tensioning cylinder 9 which is pivotally mounted between two vertical, laterally projecting tabs 11 of the lower die holder half 203.
  • the piston rod 12 of this clamping cylinder 9 extends upwards through the gap formed between two vertical, laterally projecting tabs 13 of the upper die holder half 103. Above these tabs 13, the piston rod 12 of the tensioning cylinder 9 has a conically expanded coupling head 14, to which a corresponding conical receptacle in the upper edge of the two tabs 13 is assigned.
  • the pivotally mounted clamping cylinder 9 can be pivoted using a hydraulic adjusting cylinder 15.
  • the coupling head 14 By lifting the piston rod 12 of the tensioning cylinder 9, the coupling head 14 is disengaged from the associated upper receptacle of the tabs 13 and the tensioning cylinder 9 can be pivoted outward in the direction of arrow F1 of FIG. 2 with the aid of the adjustment cylinder 15. As a result, the piston rod 12 with the coupling head 14 is pivoted out of the gap between the tabs 13.
  • the upper die holder half 103 can then be opened. When the die holder 3 is open, the block receiving die 2 with the metal block 1 enclosed therein can be easily and quickly lifted out of the die holder 3 or inserted into it.
  • the tensioning cylinder 9 is pivoted back with the aid of the adjusting cylinder 15 in the opposite direction to the arrow F1 in FIG. 2, the piston rod 12 with the coupling head 14 being pivoted in between the two associated tabs 13 of the upper die holder half 103.
  • the piston rod 12 of the clamping cylinder 9 is then pulled down.
  • the coupling head 14 consequently engages in the corresponding upper receptacle of the two tabs 13 and braces the upper die holder half 103 firmly with the lower die holder half 203.
  • the two die holder halves 103, 203 are provided with centering pins 16 and associated centering bores 17.
  • the two-part block receiving die 2 is automatically opened and closed simultaneously with the two-part die holder 3.
  • the upper die half 102 can in particular be detachably and displaceably connected to the upper die holder half 103 in the longitudinal direction.
  • the upper die half 102 has an outer, longitudinally oriented web 60 which is T-shaped in cross section and which slidably engages in a correspondingly profiled inner groove 61 of the upper die holder half 103.
  • a stationary counter pressure body 18 which has a cylindrical projection 118 projecting forward and coaxial with the block receiving die 2.
  • This approach 118 fits into the rear empty end of the tubular block receiving die 2 and forms the die bottom against the metal block 1.
  • the rear section of the tubular block receiving die 2 engages longitudinally displaceably, at least at the beginning of a work process, in a corresponding, ring-shaped guide and centering groove 19 provided in the counterpressure body 18.
  • a hydraulic Ge 2 which is coaxial with the block receiving die gene pressure cylinder 20 is provided, which is completed on the back with a cover 21.
  • the piston 22 of this counter-pressure cylinder 20 is connected to a cylindrical counter-punch 23, which extends through a chamber 24, which is provided in the counter-pressure body 18 and is open laterally and / or downwards, and into a subsequent, central, continuous punching opening 25 of the front, forming the die base.
  • cylindrical approach 118 engages appropriately.
  • This counter-punch 23 has the same diameter of the through-bore 101 to be produced in the metal block 1 and is flush with the front, flush with the front, flat surface of the cylindrical extension 118, ie with the die bottom. The counter-punch 23 thus forms the middle part of the die bottom and bears against the metal block 1 enclosed in the die 2.
  • a drill punch 26 coaxial with and to the counter punch 23, which can be displaced in the axial direction by a hydraulic press cylinder 27 and about its longitudinal axis by any drive motor 28, e.g. can be rotated by a coaxial hydraulic motor.
  • the press cylinder 27 is connected to the counterpressure body 18 via longitudinal tie rods 29 which engage on the one hand on laterally projecting tabs 30 of the counterpressure body 18 and on the other hand on a flange 31 of the press cylinder 27.
  • the tubular piston 32 of the press cylinder 27 is axially displaceable but non-rotatably guided on an inner tubular guide projection 33 of the cylinder cover 34.
  • a hollow punch holder head 35 in which the punch 26 is rotatably mounted, is firmly connected to the piston 32 of the press cylinder 27.
  • the drive motor 28 for the rotary movement of the drilling punch 26 is also fastened.
  • the stamp holder head 35 can also be provided with vibrators 36.
  • the drill punch 26 consists of two tubular, mutually coaxial punch bodies 126, 226 which are arranged one inside the other and form an annular intermediate chamber 37 for a cooling liquid.
  • the outer tubular punch body 226 is sealed off with the aid of a short, cylindrical punch end section 38.
  • This stamp end section 38 is screwed with its inner threaded shaft 38 'sealingly into a head-side threaded bore of the inner tubular stamp body 126.
  • a driving head 39 is provided, which is slightly rotated about a longitudinal axis or axis of rotation of the drilling die 26, e.g. is freely rotatable by 1 ° -10 °, preferably by 4 ° -7 ° inclined axis.
  • the drive head 39 has a rear pin 40 which is rotatably mounted in a blind bore 42 of the stamp end section 38 with the aid of a bearing bush 41.
  • the rear, flat end surface 139 of the drive head 39 is perpendicular to the inclined axis of rotation of the drive head 39 and bears against a correspondingly obliquely directed, flat, front end surface 138 of the stamp end section 38.
  • the driving head 39 widens somewhat conically towards the front and its front end face 43 is flat conical, e.g. has a cone angle of 165 ° -175 °, preferably of 170 °.
  • the freely rotatable driving head 39 of the punch 26 is cooled by circulation of a cooling liquid.
  • the cooling liquid is fed through the intermediate chamber 37 of the ram 26 used as a flow and flows through a channel system 44, 45, 46 connected to it in the ram end section 38 and in the driving head 39.
  • the cooling liquid is returned axially through a centrally provided in the driving head 39 through the pivot pin 40, which flows out into the blind bore 42 and through a further connecting reflux channel 48, which is provided in the center in the punch end section 38 and in the threaded shaft 138 and is connected to the cavity 49 of the inner, tubular ram body 126 serving as a return.
  • the channels 45 in the stamp end section 38 are connected to the channels 46 in the drive head 39 via a flat, annular flow chamber 50, which is formed between the stamp end section 38 and the drive head 39 and is delimited by sealing rings 51, 52.
  • the ram 26 is pressed in the axial direction into the metal block 1 enclosed in the block receiving die 2 by the piston 32 of the hydraulic press cylinder 27.
  • the metal displaced by the pressed-in punch 26 flows back around the punch 26 in the axial direction.
  • This backflow of the displaced metal under the pressure of the punch 26 is accompanied by a corresponding longitudinal displacement of the block receiving die 2 in the die holder 3, so that the friction between the extruded metal and the block receiving die 2 is avoided.
  • the rotation of the Bohrstempels 26 about its longitudinal axis and the arrangement of the two obliquely directed abutment surfaces 138 and 139 between the Bohrstempel 26 on the one hand and freely rotatable driving head 39 on the other hand cause namely a wobbling motion of the driving head 39 which, consequently, with its forward conical end surface 43 on the Bottom of the hole being formed in the metal block 1 rolls.
  • the drive head 39 of the plunger 26 is therefore only in contact with the bottom surface of the bore in the metal block 1 which is being formed in the region of a linear or strip-shaped, very narrow, radial pressure surface which corresponds to a generator of the front conical end surface 43 of the drive head and is continuous rotates at the speed of rotation of the punch 26.
  • the axial pressure exerted by the punch 26 is concentrated on a narrow, radial, circumferential surface, and very high specific pressures result.
  • the pressure exerted by the press cylinder 27 can also be reduced accordingly.
  • the vibrations generated by the vibrators 36 prevent jamming and jamming of both the punch 26 in the bore 101 in the metal block 1 and the piston 32 in the press cylinder 27.
  • the counter-punch 23 is withdrawn in the axial direction or relieved of the corresponding supporting pressure by opening the return line of the hydraulic counter-pressure cylinder 20.
  • the middle punch opening 25 in the base part 118 of the block receiving die 2 is released and the remaining bottom disc of the blind hole produced in the metal block 1 by the previous pressing in of the punch 26 is sheared off in the course of the same pushing-in movement as soon as the axial pressure exerted by the punch 26 provides the shearing force achieved sufficient value.
  • the sheared bottom disk of the blind bore is ejected from the punch 26 through the punch opening 25 into the chamber 24.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP19780100737 1977-08-31 1978-08-24 Vorrichtung zur Herstellung von durchgehenden Bohrungen in Metallblöcken Expired EP0000943B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1275477A IT1082622B (it) 1977-08-31 1977-08-31 Metodo e dispositivo per praticare fori passanti in blocchi metallici
IT1275477 1977-08-31

Publications (2)

Publication Number Publication Date
EP0000943A1 EP0000943A1 (de) 1979-03-07
EP0000943B1 true EP0000943B1 (de) 1981-01-07

Family

ID=11143101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19780100737 Expired EP0000943B1 (de) 1977-08-31 1978-08-24 Vorrichtung zur Herstellung von durchgehenden Bohrungen in Metallblöcken

Country Status (4)

Country Link
EP (1) EP0000943B1 (ru)
DE (1) DE2860420D1 (ru)
IT (1) IT1082622B (ru)
SU (1) SU824881A3 (ru)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3604630A1 (de) * 1986-02-14 1987-08-27 Loehr & Bromkamp Gmbh Lagerungsanordnung
DE19803366A1 (de) * 1998-01-29 1999-08-05 Bosch Gmbh Robert Gehäuseblock
RO127383A2 (ro) * 2010-09-03 2012-05-30 Mb Telecom Ltd S.R.L. Metodă şi sistem pentru fabricarea corpurilor cave şi profilate
CN103909192B (zh) * 2014-04-14 2016-06-22 上海电机学院 多向模锻挤压液压机

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732738A (en) * 1956-01-31 Hydraulic press
US1374369A (en) * 1919-03-29 1921-04-12 Luther D Earl Tool for piercing billets
US1702278A (en) * 1928-05-18 1929-02-19 Simons Abraham Method of making seamless containers
GB449420A (en) * 1935-03-13 1936-06-26 Stewarts & Lloyds Ltd Improvements relating to the manufacture of hollow metal articles such as tubes
US2250338A (en) * 1939-03-21 1941-07-22 Omes Continental Ltd Manufacture of seamless hollow articles
US2299105A (en) * 1940-03-18 1942-10-20 Dominion Eng Works Ltd Method and apparatus for forging billets
CH387322A (de) * 1961-11-13 1965-01-31 Bodmer Gottfried Verfahren und Vorrichtung zum Formen von Schliessköpfen an Nieten
DE1652653B1 (de) * 1967-01-20 1972-05-31 Politechnika Warszawska Walzgesenkpresse
US3494161A (en) * 1968-01-11 1970-02-10 Alexandr Nikolaevich Silichev Device for stamping metal blanks
DE1752007C2 (de) * 1968-03-20 1983-04-28 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Verfahren und Vorrichtung zum Fließpressen von rohrförmigen Werkstücken, insbesondere von Flanschen mit hohem Rohransatz
US3597957A (en) * 1968-05-11 1971-08-10 Kobe Steel Ltd Metal billet piercing press
GB1224260A (en) * 1969-07-03 1971-03-10 Massey Ltd B & S Improvements in upsetting or forging machines
FR2098385A1 (en) * 1970-07-14 1972-03-10 Politechnika Warszawska Press for thin objects - with one oscillating matrix and one which moves axially
US3762199A (en) * 1972-02-19 1973-10-02 S Yoshikawa Rivet head forming tool
GB1434573A (en) * 1973-10-24 1976-05-05 Yoshikawa Iron Works Riveting machine

Also Published As

Publication number Publication date
SU824881A3 (ru) 1981-04-23
DE2860420D1 (en) 1981-02-26
EP0000943A1 (de) 1979-03-07
IT1082622B (it) 1985-05-21

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