EP3900903B1 - Apparatus for the execution of sound absorbing panels with micro-holes - Google Patents

Apparatus for the execution of sound absorbing panels with micro-holes Download PDF

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Publication number
EP3900903B1
EP3900903B1 EP21167689.5A EP21167689A EP3900903B1 EP 3900903 B1 EP3900903 B1 EP 3900903B1 EP 21167689 A EP21167689 A EP 21167689A EP 3900903 B1 EP3900903 B1 EP 3900903B1
Authority
EP
European Patent Office
Prior art keywords
axis
punching
piston
slide
plane
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.)
Active
Application number
EP21167689.5A
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German (de)
English (en)
French (fr)
Other versions
EP3900903A1 (en
Inventor
Andrea Donati
Franco TANZINI
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.)
Vitap Costruzioni Meccaniche SpA
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Vitap Costruzioni Meccaniche SpA
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Publication of EP3900903A1 publication Critical patent/EP3900903A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/04—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by punching out
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
    • B27M3/0013—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles
    • B27M3/008—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by bar or grill connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
    • B27M3/0093—Manufacture or reconditioning of specific semi-finished or finished articles of raised panels, i.e. panels having a profiled surface

Definitions

  • the present invention relates to the field of the processing of wooden structural elements, and notably that of the production of sound absorbing panels.
  • the invention relates in particular to an apparatus for the execution of sound absorbing panels of the so-called "micro-hole” type, which can be used for coating walls, ceilings and the like, or also for the manufacture of doors, leaves, items of furniture, partition elements or other furnishing components.
  • Wooden sound-absorbing panels currently comprise composite elements which have holes or cuts in communication with cavities, for the purpose of absorbing and dissipating the sound pressure wave.
  • a base layer of the panel is normally made of chipboard, plywood, MDF or the like.
  • the panel then has a coating sheet with an aesthetic function, for example made of thermoplastic, laminated, CPL, methacrylate, veneer sheets, plastic laminates and the like.
  • the coating sheet on the side intended to be visible, has a distribution of micro-holes that are in communication with holes having a larger diameter made on the base or rear layer.
  • the micro-holes have a diameter less than 1 mm, generally 0.5-0.7 mm, with a pitch of 2.7 to 5 mm.
  • the holes in the rear part are made with normal drill bits and with machines already existing on the market.
  • the coating sheet is processed separately through microdot rollers, which actually only affect the panel coating that is to be subsequently glued to the base material.
  • the manufacturing process is therefore comprised of various steps and creates standardized formats.
  • the cost of the rollers is high and there is certainly the problem of insufficient adaptation to the various formats required, both in terms of maximum size that can be processed and in terms of the diameter and pitch of the micro-holes.
  • a known solution envisages the use of laser drilling systems. With such technology it is possible to process the coating sheet also once and after assembly is complete, therefore overcoming the production and rigidity problems highlighted above for punch or roller two phase systems.
  • laser technology has other drawbacks. As well as causing small burns on the material, it forms openings that are actually slots with an elliptical profile.
  • the laser device used is a sort of comb provided with rotary motion with respect to a parallel axis to the surface to be processed, therefore when the laser beam is perpendicular to the surface the openings obtained on the sheet are circular, but when the beam is inevitably inclined with respect to the surface the opening has an elliptical slot profile. Such effect is undesired both from an aesthetic and a functional point of view.
  • the object of the present invention is that of providing an apparatus that is able to execute a micro-drilling treatment on the coating sheet of an already assembled sound absorbing panel (sheet already glued to the base material previously drilled), with a low production cost, which is flexible for being able to process different panel formats, and which does not have any of the aesthetic and functional drawbacks presented by systems that make use of laser drilling.
  • the apparatus comprises, on a base 1 generally able to provide a suitable structural support resting on the ground plane, a support plane 2 for the support and advancement of the panels to be processed, a plane on which an axis X identifies the advancement direction of the panel, and an axis Y orthogonal to the axis X identifies a transverse direction.
  • the support plane 2 is materialized by a central band 22, which extends for the entire extension of the plane according to the axis Y and for a reduced extension according to the X axis; according to the latter axis, the central band 22 is preceded and followed by an inlet section 21, defined between an inlet side 2a and the central band, and by an outlet section 23, between the central band and an outlet side 2c of the plane 2.
  • the central band 22 is comprised of a solid and smooth surface element, typically metallic, which, as will be seen below, has an anvil function, contrasting the thrust exerted on the panel by the drilling action without damaging the panel itself.
  • the inlet 21 and outlet 23 sections instead advantageously envisage distributions of brushes that assist the movement of the panel along the axis X.
  • a panel handling device 3 extends, comprising a first system of linear recirculating ball bearing guides 31 on which two grippers 32, 33 move, adapted to grasp the panel on the edge that is contiguous to the device itself.
  • the grippers 32, 33 have mutually independent motion activated by respective motorizations 34, 35 typically brushless motors, and by a pinion-rack transmission (not visible).
  • the action of the grippers is however controlled in a coordinated way by the apparatus control system, of the numerical control type (CNC).
  • One gripper 32 has a stroke which extends from the inlet side 2a to a substantial part of the central band 22, the other gripper 33 instead has available for its stroke an area of the plane between the inside of the central band 22 and the outlet side 2c.
  • the grippers cannot exceed the limit of the central band, in their respective strokes.
  • the side 2b and the opposite side 2d have respective distributions of rolls 24, 25 for the sliding abutment of the advancing panel.
  • the distribution 25 opposite the one adjacent to the grippers 32, 33 is mounted on a support movable along the axis Y, for exercising the function of a gripping alignment device on the panel, adapting the width of the plane to the dimensions of the panel.
  • the alignment device can be manually moved, until the engagement of a block that stops it in the desired gripping position.
  • the plane 2 but more specifically the central band 22, it is superposed, therefore in substantial alignment according to the punching axis Z, by a punching unit 4 comprising a punching die or mould 41.
  • the unit 4 projects towards the plane 2, starting from a slide 42 which is slidably engaged on a guide bridge 5.
  • the latter extends along the axis Y at the central band 22 of the plane 2 and on which a second system of linear guides 51 extends, e.g. of the recirculating ball bearing type, with which the slide 42 engages, for exercising the movement along the aforesaid transverse axis Y.
  • the motion of the slide 42 with respect to the bridge 5 is activated by a motor 43 (e.g. a brushless motor) integral with the slide itself and meshing through a pinion 43a with a rack, not shown. Also in this case the control is entrusted to the centralized CNC system of the apparatus.
  • a motor 43 e.g. a brushless motor
  • the slide 42 has advantageously a plate-shaped structure which has the task of supporting all the other elements of the group and absorbing the punching force.
  • a linear actuating means for actuating the die can be distinguished in the form of a hydraulic piston 44 which extends along the axis Z and which, at a distal end opposite the connection end to the slide, bears the already mentioned die 41.
  • the piston is of the pulse kind with an alternate fixed stroke (for example 10 mm) and is responsible, as can be seen, for the mechanical pressure which, when transmitted to the die, is used for a drilling step on the panel.
  • the aforesaid stroke is in one basic embodiment a design parameter of the apparatus and cannot be modified. However, a more sophisticated embodiment can also be provided in which the stroke can represent a variable operating parameter. In fact, by modifying the stroke of the hydraulic piston, it is possible to generate micro-holes of substantial depth which may even cross of the entire thickness of the panel.
  • the force that can be exerted by the piston can clearly be calibrated by intervening on a control unit of the hydraulic circuit. Such calibration tends to be performed during manufacturing and installation and it is not necessary to modify it, but in general in the event of particular processes there is nothing to prevent re-calibrating the pressure even with the machine already installed.
  • connection between the piston 44 and the slide 42 is carried out with the interposition of a device 45 which can be adjusted in height (axis Z), adapted to vary in an adjustable way the distance between the piston and the slide, and therefore the absolute distance between the die and the plane, an adjustment which is necessary for adapting the apparatus to operations on panels with different dimensional characteristics, and notably the thickness characteristics.
  • a device 45 which can be adjusted in height (axis Z), adapted to vary in an adjustable way the distance between the piston and the slide, and therefore the absolute distance between the die and the plane, an adjustment which is necessary for adapting the apparatus to operations on panels with different dimensional characteristics, and notably the thickness characteristics.
  • the device 45 envisages a body such as preferably a bushing 451 which is rotatably supported by the slide 42 about the axis Z, by means of axial bearings 452.
  • the bushing which internally defines a threaded seat 451a, is engaged with a threaded shank 441 of the piston 44.
  • a solid body can replace the bushing and the threaded coupling can be made with a seat obtained within the shank.
  • a bevel gear 453 is fixed coaxially onto the bushing 451, such gear engaging with a pinion 454 whose spindle 454a is pivotally supported about its axis (parallel to the plane 2 or, geometrically speaking, to the plane XY) by a bracket 455 which fixedly projects from the slide 42.
  • An obvious variant may also clearly be a motorized actuation.
  • a flange 457 is fixed within the body of the piston 44, which flange extends orthogonally to the axis Z and is slidably engaged in a plurality (four in the example, at the four corners of the flange 457, quadrilateral here) of guide columns 458 which in turn extend solidly from the slide 42, and still parallel to the axis Z.
  • the guide action of the columns prevents the rotation of the piston about its own axis, therefore the already mentioned rotation of the bushing 451 necessarily responds to a vertical translation of the piston, a translation which therefore represents the only degree of freedom of the adjustment movement of the piston itself.
  • a reversible plug of the crank 456 placed outside the bracket 455 and indicated by number 459 such plug exposing the manoeuvring shaft 454a of the pinion 454, there is a numerical index adapted to directly translate the degree of rotation of the pinion into the height reached by part of the die along the axis Z.
  • Such plug also incorporates the clamping of the reached and desired adjustment position, which can be seen in particular in figure 5 and indicated by the number 459a, acting on the pinion shaft, once the desired height/position has been reached.
  • the latter comprises an upper plate 411 with a distribution of driven in needle-shaped punches 412, intended to impress the micro-holes on the panel, and a lower plate 413 parallel to the upper plate (both plates being orthogonal to the axis Z) pierced by the punches and acting as a guide thereof and also as a panel stop element in the working/piercing condition.
  • the extension dimensions of the plates, and in particular their length measured according to the axis X, is, preferably, substantially the same as the central band 22 of the plane 2, at which the group, as mentioned, is arranged. In this way, the functional coupling between the percussive effect of the die and the anvil effect of the flat band 22 is guaranteed.
  • the two plates are movable towards one another, with the contrast of an elastic means 414; more precisely, the upper plate is integral with the piston, whereas the lower plate is connected to the upper plate so as to be able to retract in approach to the upper plate, a motion which is contrasted by the springs mentioned above.
  • Four columns 415 also in this case exercise the required guide action, rising integrally from the lower plate 413 and being inserted slidably in through seats obtained on the upper plate 411.
  • the mentioned elastic means comprises helical springs 414 arranged coaxially to respective columns 415.
  • stop pins 416 are provided which, like the columns 415, rise from the lower plate and are inserted slidably in seats provided on the lower plate; such pins have heads 416a at the upper end which abut on the outside of the upper plate and exercise the support and blocking of the lower plate in the maximum distance position with respect to the upper plate, a position assumed due to the effect of the springs 414 in the rest condition.
  • the fixing of the die 41, or more precisely of the upper plate 411, to the rod 442 of the hydraulic piston is carried out thanks to a dismountable connection, to enable the easy replacement thereof where necessary, either for maintenance or due to wear, or to change the pitch of the micro-holes to be made according to production requirements.
  • the die also enables the number of punches used to be reduced, in the event that they have particular panel dimensions or if micro-hole prints are to be made which follow a geometric pattern. The reduction takes place by simply removing the punches which do not need to take part in the process from the die.
  • a CNC system controls the operation of the apparatus on the basis of design criteria that are known and/or can be implemented by a person skilled in the art. Therefore, a detailed description of such system is omitted; similar considerations are valid for other design aspects (structure, power supply, hydraulic circuits, etc.).
  • the first operation is represented by the height adjustment of the punching unit 4, through the actuation of the pinion 454 (a manual one in this case using the crank 546), as described above.
  • This is, in general, an initial operation with respect to a processing session on a batch of uniform panels, for adapting the apparatus to the characteristics of the panels of such batch, and it is not therefore repeated except when passing on to the processing of a different batch, the adjustment remaining the same between the piercing of a panel and that of the subsequent panel of the sequence.
  • a panel P to be drilled, already assembled with base material and a coating sheet turned upwards, is fed onto the plane 2, gripped by the first gripper 32 ( figure 7a ) and transported thereby along the axis X (advancement direction) until a head portion thereof is superposed with the central band 22 ( figure 7b ).
  • the gripper stops, also stopping the panel.
  • the punching unit 4 is stopped with respect to the guide bridge 5 in a stroke start position, in which it superposes a first region, adjacent to the side of the panel handling device 3, of that band of panel that overlaps with the central band 22. Due to the effect of the above-mentioned adjustment, the unit is, in height terms, in a zero position ( figure 7c ), such that the lower plate 413 of the die 41 remains raised with respect to the panel, at a distance such as to enable mutual movements (due to the advancement motion of the panel or the translation of the unit 4 along the guide bridge 5).
  • the springs 414 interposed between the two plates are compressed until reaching the entire stroke envisaged for the piston rod.
  • the return stroke begins, the upper plate 411 starts to lift extracting the punches from the processed material, whereas the lower one 413 continues to remain in contact with the surface of the panel and applies a force thereto, exercised by means of the springs mentioned above, which prevents the lifting of the panel itself.
  • the zero position is reached again at the end of the return stroke, distancing the lower plate from the panel again.
  • the unit 4 is gradually translated in the Y direction along the guide bridge 5 ( figure 7g ), repeating at every stop the punch stroke as described above, until affecting the entire width of the panel.
  • the panel P is made to advance in steps, with the contribution of the second gripper 33, superposing in sequence said bands of the panel with the central band 22 of the plane 2 ( figure 7h ).
  • the unloading of the panel can take place either on the opposite side to the inlet one, or by inverting the movement exiting from the same side as the insertion.
  • the dimensional flexibility enables the work field of the machine to be adapted to the piece to be produced rather than having to produce an object that needs to undergo further processing for reaching the final dimensions.
  • the possibility to modify the diameter of the micro-holes, their pitch and the work field enables a simple and flexible system to be obtained, which can be modified in contained time scales.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Building Environments (AREA)
EP21167689.5A 2020-04-24 2021-04-09 Apparatus for the execution of sound absorbing panels with micro-holes Active EP3900903B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102020000008851A IT202000008851A1 (it) 2020-04-24 2020-04-24 Apparecchiatura per la realizzazione di pannelli fonoassorbenti microforo

Publications (2)

Publication Number Publication Date
EP3900903A1 EP3900903A1 (en) 2021-10-27
EP3900903B1 true EP3900903B1 (en) 2022-10-05

Family

ID=71452670

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21167689.5A Active EP3900903B1 (en) 2020-04-24 2021-04-09 Apparatus for the execution of sound absorbing panels with micro-holes

Country Status (4)

Country Link
EP (1) EP3900903B1 (es)
ES (1) ES2932977T3 (es)
IT (1) IT202000008851A1 (es)
PL (1) PL3900903T3 (es)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107891473A (zh) * 2017-05-29 2018-04-10 广州子赫建筑装饰有限公司 一种建筑装饰板材的双头打孔装置
CN209998176U (zh) * 2019-06-01 2020-01-31 苏州玉超精密机械有限公司 一种高精度微孔板冲孔精密模具

Also Published As

Publication number Publication date
EP3900903A1 (en) 2021-10-27
IT202000008851A1 (it) 2021-10-24
ES2932977T3 (es) 2023-01-30
PL3900903T3 (pl) 2023-01-30

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