EP0561748B1 - A work bench for a machine tool - Google Patents

A work bench for a machine tool Download PDF

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Publication number
EP0561748B1
EP0561748B1 EP93830103A EP93830103A EP0561748B1 EP 0561748 B1 EP0561748 B1 EP 0561748B1 EP 93830103 A EP93830103 A EP 93830103A EP 93830103 A EP93830103 A EP 93830103A EP 0561748 B1 EP0561748 B1 EP 0561748B1
Authority
EP
European Patent Office
Prior art keywords
work
plane
tubular bodies
grooves
work bench
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 - Lifetime
Application number
EP93830103A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0561748A2 (en
EP0561748A3 (en
Inventor
Giuseppe Gemmani
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.)
SCM Group SpA
Original Assignee
SCM Group 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 SCM Group SpA filed Critical SCM Group SpA
Publication of EP0561748A2 publication Critical patent/EP0561748A2/en
Publication of EP0561748A3 publication Critical patent/EP0561748A3/en
Application granted granted Critical
Publication of EP0561748B1 publication Critical patent/EP0561748B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
    • B25B11/005—Vacuum work holders

Definitions

  • the invention relates to a work bench for a machine tool.
  • the present invention may be advantantageously but not exclusively applied in the field of automatised working of panels made in wood or chipboard, which working is usually achieved by arranging the panels on special support and work benches, in strictly defined positions, and working on them by means of tools (normally vertical-axis milling machines) which tools constitute the operating organs of pantograph apparatus, such as for example those illustrated in patent publication IT-1.220.380 in the name of the present applicant.
  • tools normally vertical-axis milling machines
  • the most frequently-used prior art benches are composed of a base plane structured in welded steel and a work plane in aluminium or synthetic material.
  • the said base plane is internally crossed by channels, parallel to each other and communicating upstream with an aspiration source, which channels open at a plurality of zones determined by the upper surface of the work plane through corresponding vertical-axis threaded cylindrical holes.
  • Each hole is associable to a movable cap, constituted essentially by a screw, and the upper surface of the work plane is grooved by a network of channels of substantially rectangular transversal section, constituted by a series of channels arranged, in each series, parallel to each other and reciprocally equidistant, which intersect according to respective horizontal and perpendicular directions among them: in the prior art these channels are made by machine-tool working on a virgin panel which then becomes the above-mentioned work-plane.
  • FIG. 865 359 Another solution, as illustrated in the document US-A-3 865 359, refers to a vacuum apparatus for holding a workpiece in which the supporting plane is realized by means of a top plate in which there is provided a series of recesses or channels in a grid-like pattern on the surface which are intended to receive strip material sealing means; this top plate is made of aluminium or stainless steel and is fixedly secured to a base plate in which is realized a plurality of channels able to be connected to a source of reduced static pressure.
  • These two plates, the top and the base are preferably realized in aluminium, but the rigidity of the whole work bench is not too high in order to satisfy the blocking of the workpiece with no flexional strain during the working of the same.
  • the US-A-3 613 208 refers to a method for producing the orifices in a work-holding surface of a vacuum panel fixture in which the final top surface is shaped as a plane without any recesses, channels or grooves for the blocking of the panel or the receiving of sealing means.
  • a work table to use a vacuum to hold an object which comprises a top plate provided only by tranversally extendable openings, an honeycomb structure disposed under the top plate and provided by cores which are utilized as connecting ducts for said openings, a support plate for the honeycomb structure and an orifice plate for connecting the whole work table to the vacuum source.
  • One of the advantages obtained through the present invention essentially consists in the fact that the work bench as herein described is substantially undeformable, and furthermore shows itself to be considerably more versatile than the above-described prior art work benches.
  • 1 denotes in its totality a work bench usable as a workpiece bearing element for a machine tool (not illustrated) aimed at performing mechanical operations on workpieces having substantially flat rest surfaces, and in particular for a machine tool for the automatised working of panels 2 made in wood or chipboard, by means of tools constituting the operating organs of pantograph apparatus.
  • the panels 2 are used herein as examples, but the work bench 1 could be used for blocking and positioning above it any workpiece having a substantially flat inferior surface.
  • the work bench 1 comprises a base plane 3 exhibiting a substantially flattened parallelepiped shape, and being highly rigid, being finished to a high planarity, presenting a low unit weight, and preferably being constituted by a panel, of the kind easily found on the market, preferably made in aluminium alloy and internally exhibiting a conformation of the type commonly called "honeycomb".
  • Some plates 4 are connected to the lower surface of the base plane 3, which plates 4 are of a substantially rectangular shape and are aimed at permitting, in a known way, the blocking and positioning of the work bench 1 to a portion of the said machine tool, which portion will be constituted by the machine tool movement car on the horizontal plane.
  • a lower portion of a work plane 5 is connected, preferably by means of adhesive material, to the upper surface of the panel 3, which work plane 5 is made in extruded aluminium alloy and has on the whole a parallelepiped shape.
  • the work plane 5 is longer than the base plane 3, so that between two opposing ends of the base plane 3 and the corresponding opposing ends of the work plane 5 there is an angular cavity 6 the purpose of which will become clearer hereinbelow.
  • the work plane 5 (made by extrusion and therefore having surface finishing and planarity comparable to those of the underlying base plane 3) essentially comprises a horizontal wall 7, to which lower face tubular bodies or longitudinal channels 8 having substantially rectangular section are solid, which channels 8 are parallel to each other and reciprocally equidistanced, and which extend over all of the length of the horizontal wall 7 measured according to a normal direction, with reference to figure 1, to the figure plan.
  • the upper surface of the horizontal wall 7 is equipped with a plurality of horizontal grooves 9, reciprocally equidistanced and developing according to the development direction of the tubular bodies 8, which horizontal grooves 9 in section exhibit an upturned T-shape and which are intercalated with groove couples 10 positioned side-by-side and parallel to the said horizontal grooves 9, and exhibiting a section which is substantially square.
  • the upper surface of the horizontal wall 7 is also equipped with a plurality of grooves 11, reciprocally parallel and equidistant to each other, which develop, with vertical depth equal to that of the groove couples 10, according to a horizontal direction which is normal to that of the horizontal grooves 9 and the groove couples 10; the grooves 11 are machined on the extruded work-plane 5.
  • the two ends of the base plane 3 arranged adjacent to the ends of the tubular bodies 8 are breasted over all their length, at the said angled cavities 6, by respective tubular bodies or manifold means 12 closed at the ends and communicating sealedly, through repective portions of the upper walls, with respective ends of the said tubular bodies 8.
  • the manifold means 12 communicate, through respective conduits 13, with an aspiration source 14.
  • the intermediate portions of all of the tubular bodies 8 are obstructed by stops or obstruction means 16 sealedly inserted in them (simple stops in a resilient material having the function of dividing the plane into two semiparts with distinct depressions) and, as is particularly visible in figures 2, 4 and 5, the upper surface of the horizontal wall 7 is crossed by a plurality of vertical-axis holes 17 uniformly distributed above the tubular bodies 8 and also intersecting respective zones of two projections 18 which are part of the said horizontal wall 7 and which define a horizontal groove 9 between them.
  • each hole 17 is vase-shaped, that is it exhibits a truncoconical shape with the vertex arranged downwards, and the internal cavities of the tubular bodies 8 exhibit, in transversal section, substantially a T-shape, since they are superiorly equipped with a larger tranversal zone with respect to that of the inferior zone, which internal cavity is inferiorly defined on its two sides by respective horizontal surfaces or steps 19 on which a horizontally-developing wall 20 (precisely, a flat holed metal plate) rests below the holes 17, which wall 20 is equipped below each of the holes 17 with a coaxial hole 21.
  • a self-locking threaded nut 22 is inserted, which exhibits an upper edge having a transversal mass which is greater than that of the holes 21 of the wall 20 and which is therefore supported by the edge of a relative hole 21.
  • a said wall 20 is inserted, as above-described, in each of the tubular bodies 8 above the relative steps 19, with a nut 22 housed in each of its holes 21 in the way illustrated in figure 4.
  • the wall 20 is thus positioned, by means of longitudinal movements, in such a way that the axes of its holes 21, and thus the axes of the nuts 22, meet with the axes of the overlying holes 17 bored in the horizontal wall 7.
  • At least one end nut 22 of each tubular body 8 is thus held by a grub 23, (figure 3), which grub 23 also interests (not shown) a hole in the horizontal wall 7, thus guaranteeing the permanent axial immobility of the wall 20 associated to it with respect to the relative tubular body 8.
  • each hole 17 the stem of a countersunk screw 24 is inserted, which stem enmeshes with the thread of the nut 22 (vertically aligned to it) in a screw-lead screw coupling.
  • the screw will be called hereinafter a stop or stop means, and the nuts 22 will be called sealed holding means of the stops 24 in the holes 17.
  • screws 24 can be anchored, one of which screws 24 is represented by a broken line in figure 4, to respective nuts 22, after having removed the relative screws 24 from the holes 17 overlying the said nuts 22;: it is interesting to notice that the "free" nuts 22 are unable to run along the tubular bodies 8, being held in position by the underlying holes bored in the wall 20.
  • the seal 25 guarantees, in a known way so obvious as not to require explanation, a maximum aspiration action on the part of the holes 17 on the panel 2.
  • the work bench 1 described fully reaches the predetermined aims, since it is remarkably light, thanks to the adoption of the base plane 3 described, but very rigid and undeformable thanks to its described conformation. Furthermore, it is not susceptible to variations in temperature and permits of extremely precise positioning of the panels 2 on it.
  • the base plane 3 performs the functions of constructional precision, while the extruded upper plane performs the functions of transporting the vacuum, and of creating both the channels to hold the workpiece and the blocking channels 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Units (AREA)
  • Jigs For Machine Tools (AREA)
  • Special Chairs (AREA)
  • Agricultural Machines (AREA)
EP93830103A 1992-03-17 1993-03-16 A work bench for a machine tool Expired - Lifetime EP0561748B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO920093A IT1257767B (it) 1992-03-17 1992-03-17 Pianale di lavoro per macchina utensile
ITBO920093 1992-03-17

Publications (3)

Publication Number Publication Date
EP0561748A2 EP0561748A2 (en) 1993-09-22
EP0561748A3 EP0561748A3 (en) 1993-12-15
EP0561748B1 true EP0561748B1 (en) 1997-07-30

Family

ID=11338081

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93830103A Expired - Lifetime EP0561748B1 (en) 1992-03-17 1993-03-16 A work bench for a machine tool

Country Status (3)

Country Link
EP (1) EP0561748B1 (it)
DE (1) DE69312538T2 (it)
IT (1) IT1257767B (it)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2152137B1 (es) * 1997-11-11 2001-08-16 Bermaq S A Maquinas para el trabajo de la madera.
DE10214328A1 (de) * 2002-03-28 2003-10-16 Thomas Herbert Drittenpreis Vorrichtung für die Aufnahme von zu bearbeitenden Werkstücken

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3613208A (en) * 1968-08-20 1971-10-19 Harold A Seberg Method of fabricating a perforated panel for a vacuum work-holder or chuck
DE1923833C3 (de) * 1969-05-09 1975-11-27 Vereinigte Flugtechnische Werke - Fokker Gmbh, 2800 Bremen System zum Aufbau von Vorrichtungen zum Aufspannen von Werkstücken auf Werkzeug maschinentischen
US3652075A (en) * 1969-11-10 1972-03-28 Sheldon Thompson Vacuum chuck and related apparatus and methods
US3865359A (en) * 1972-05-01 1975-02-11 Dbm Industries Ltd Vacuum apparatus
US4066249A (en) * 1977-05-11 1978-01-03 Grumman Aerospace Corporation Modular vacuum work area
DE3838988C1 (en) * 1988-11-18 1989-12-07 Heinz Mielenz Gmbh, Cnc-Bearbeitung, 7316 Koengen, De Vacuum clamping device

Also Published As

Publication number Publication date
ITBO920093A0 (it) 1992-03-17
DE69312538D1 (de) 1997-09-04
EP0561748A2 (en) 1993-09-22
EP0561748A3 (en) 1993-12-15
ITBO920093A1 (it) 1993-09-17
DE69312538T2 (de) 1998-01-08
IT1257767B (it) 1996-02-13

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