Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
  • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
  • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
  • B26D1/14—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter
  • B26D1/143—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter rotating about a stationary axis
• • 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
  • B21D28/00—Shaping by press-cutting; Perforating
  • B21D28/24—Perforating, i.e. punching holes
  • B21D28/36—Perforating, i.e. punching holes using rotatable work or tool holders
• • 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
  • B21D28/00—Shaping by press-cutting; Perforating
  • B21D28/24—Perforating, i.e. punching holes
  • B21D28/243—Perforating, i.e. punching holes in profiles

Definitions

• One of the techniques for producing walls having acoustic sound absorption properties is based on the use of profiled metal facings whose surface has numerous orifices.
• Current methods consist in using either perforated profiles, generally round holes of small diameter, or even profiles in which punctures have been made.
• the punctures are partial cuts leaving the cutting waste attached to the sheet, these cuts being generally of rectangular shape.
• the profiles mentioned above are characterized by a very high cutting density, of the order of several thousand holes per square meter.
• the direction of rotation of the upper and lower tools is such that the tangential speed of said tools at the point of contact with the sheet is of the same direction and essentially of the same value as the speed of travel of the sheet.
• said device comprises means for ensuring the relative positioning along the circumference of teeth belonging to the upper and lower tools of said first pair of circular tools, said means preferably being a take-up gear box game synchronizing the trees.
• each upper elementary circular knife has teeth at its periphery, the arc of which has an equivalent length, apart from the cutting clearances, at the distance between the two notches belonging to the same final cut and produced by the first pair of tools.
• the elementary circular knives, as well as the spacers of the second pair of tools have equivalent widths, essentially apart from cutting sets.
• a first pair of rotary cutting tools performs a first plurality of transverse cuts relative to one advance of the sheet; a second pair of rotary cutting tools makes a second plurality of longitudinal cuts relative to the advance of the sheet, the combined result of these two operations being a set of closed cuts, preferably rectangular;
• the cutting waste is removed by the movement of the tools, preferably by means of combs incorporated in the second pair of tools and / or removed transversely by a conveyor belt.
• FIG. 1 shows an overview of the rotary tool system according to the present invention.
• FIG. 2 represents two elements of tools belonging to the first pair of corresponding rotary tools of FIG. 1.
• the Figure.3 shows a view in elevation of the first pair of rotary tools according to the invention.
• FIG. 4 represents two particular embodiments of the teeth of the upper rotary tool shown in FIG. 3.
• Figure 11 shows the detail of the cuts made with the first pair of tools according to a second preferred embodiment of the invention, respectively and alternately in the longitudinal direction and in the transverse direction.
• FIG. 12 shows the detail of the teeth of the elementary folding tool on the second pair of tools corresponding to the cutouts in FIG. 11.
• the object of the present invention is to obtain either a rectangular cutout or a puncture by breaking down the operations into two phases so as to guarantee good cutting quality and easy removal of waste in the case of cutting or good cutting and folding quality in the case of puncture.
• the basic principle, illustrated in Figure 1 is to use two successive pairs of rotary tools. In the case of hole cutting, this principle allows the cutting to be broken down into two phases.
• the first pair of rotary knives makes transverse cuts relative to the advance of the sheet.
• the second pair makes longitudinal cuts and ensures easy removal of waste.
• the first pair of knives makes, for example, a cut on three sides.
• Figure 1 shows an overview of the system.
• a first pair of rotary tools composed of tools 1 and 2, mounted respectively on shafts 6 and 6 ', performs a partial cut on the sheet, without removing waste.
• the cutting is completed by a second pair of tools, composed of tools 3 and 4, mounted respectively on 6 '' and 6 '' shafts.
• These shafts are supported by bearings mounted in heads similar to the profiling heads (not shown).
• the direction of rotation of each tool is indicated (B, B ', B'',B''').
• the sheet advancement takes place in direction A, in the direction indicated and is equivalent to the common peripheral speed of tools 1, 2, 3 and 4. Description of several preferred embodiments of the invention
• Figures 2 and 3 show a preferred embodiment of rotary tools 1 and 2.
• Figure 2 shows the two elements of upper circular tool 11 and lower 21 making a notch 7 perpendicular to the direction of travel sheet 5 (see Figure 5).
• the upper tool 1 consists of a stack of elementary circular tools 11 and spacers 12. These tool elements are mounted on the shaft 6, positioned and locked on the shaft in the direction of rotation by elements such as keys. These elements are also locked in the axial direction so as to guarantee precise positioning.
• the lower tool 2 is similarly constituted by a stack of elements 21, located opposite the elements 11 and separated by elements 22 which act as lateral knives when cutting the notch 7. The elements 21 and 22 are locked in rotation and positioned in the axial direction, as for tool 1.
• the elements 11, 21 and 22 are preferably made of a tool-treated heat-treated steel, as for cutting tools classics.
• This mode of construction of rotary tools is particularly advantageous because it allows economical production of tools, elements such as 11 or 21 which can be produced by cutting by wire from a stack of discs of treated tool steel discs.
• the positioning in the axial direction of the tools 1 and 2 is achieved by stops mounted on the shafts at the bearings located in the support head.
• the relative radial positioning of the teeth of the circular tools 11 and 21 is achieved by at least one box gears synchronizing the shafts 6 and 6 '. They are preferably backlash gears, so as to guarantee precise positioning compatible with cutting clearances.
• At least one of the shafts 6 or 6 ' is motorized so as to guarantee a circumferential speed of rotation of the tools equal to the advance of the sheet A.
• Figure 4 shows two embodiments of the teeth 111 or 111 'of the circular tool 11. After passing through the first pair of rotary tools, the sheet has notches 7 as shown in Figure 5 .
• Figures 6 and 7 show the elementary knives 31 and 41 performing the second cutting operation.
• the circular knife 31 has teeth 311 at its periphery, the arc of which has a length equivalent to the cutting clearance, at the distance between two successive notches 7.
• the complete upper circular tool 3 is produced by a stack of elementary knives 31 separated by spacers 32.
• the circumferential and axial positioning of the knives 31 is produced in a similar manner to that of tools 1 and 2.
• the shaft 6 '' is synchronized with respect to the shaft 6 so as to guarantee the precise positioning of the notches 7 with respect to the knives 311. This synchronization is for example carried out by a gear system.
• Figure 7 Their axial positioning is carried out as for tools 1 and 2, the relative positioning of tools 3 and 4 must be guaranteed only in the axial direction.
• the tool elements 11, 21 and 31 as well as the spacers 42 have equivalent widths, apart from the cutting clearances.
• the cutting waste is very easily evacuated between the discs 41, a comb is optionally provided, the teeth of which are inserted between the discs 41 to guarantee the evacuation of waste which would remain trapped between the cutting discs 41, the waste then being evacuated transversely, for example using a conveyor belt.
• Figure 8 schematically shows an optimized positioning of the cutouts. Indeed, a delicate point of the process is the cutting effort to be provided, particularly when cutting the notches by tools 1 and 2. To reduce this effort, it is thus advantageous to offset the cuts as presented in FIG. 8.
• the parameters to be considered are presented in FIG. 9: the transverse pitch Ptr, the long pitch Plg, the transverse cut DecTr and the long cut DecLg.
• the cutting rate a parameter determining for example the acoustic quality of the panels, is the ratio between the cut surface (DecTr x DecLg) and the surface of the steps (Plg x Ptr).
• the parameter X determining the offset is chosen to be high enough to reduce the stress on the trees. In fact, the higher the parameter X, and in particular if X is not an integer, the fewer the cuts that are made simultaneously.
• the technique of the invention also optimizes the cutting of openings in punctured mode, that is to say without removing material.
• the technology of the tools is in principle identical.
• a U-shaped cut is made as shown in 7 '(longitudinal direction) or 7' '(transverse direction) in Figure 11.
• the type 111 teeth of the tool elementary 11 are adapted accordingly.
• cutting is no longer carried out, as above, but folding according to 8.
• the teeth 311 of the elementary tool 31 are of course adapted accordingly: rounded at the level of the folding edge and games compatible with folding.
• Figure 12 shows typical views of this type of puncture, for the longitudinal direction and for the transverse direction.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
• Punching Or Piercing (AREA)
• Toys (AREA)
• Food-Manufacturing Devices (AREA)
• Adornments (AREA)

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Publications (1)

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Citations (3)

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• 2001
  • 2001-07-06 EP EP01870156A patent/EP1273365A1/de not_active Withdrawn
• 2002
  • 2002-07-04 US US10/482,168 patent/US20040231385A1/en not_active Abandoned
  • 2002-07-04 ES ES02748479T patent/ES2243743T3/es not_active Expired - Lifetime
  • 2002-07-04 BR BRPI0211239-6A patent/BR0211239B1/pt not_active IP Right Cessation
  • 2002-07-04 AT AT02748479T patent/ATE298637T1/de not_active IP Right Cessation
  • 2002-07-04 KR KR10-2004-7000125A patent/KR20040032849A/ko not_active Application Discontinuation
  • 2002-07-04 DE DE60204888T patent/DE60204888T2/de not_active Expired - Lifetime
  • 2002-07-04 WO PCT/BE2002/000115 patent/WO2003004191A1/fr active IP Right Grant
  • 2002-07-04 JP JP2003510195A patent/JP2004532739A/ja active Pending
  • 2002-07-04 EP EP02748479A patent/EP1404469B1/de not_active Expired - Lifetime
  • 2002-07-04 PT PT02748479T patent/PT1404469E/pt unknown
  • 2002-07-04 CN CNB028136535A patent/CN1286593C/zh not_active Expired - Lifetime
• 2007
  • 2007-03-01 JP JP2007051113A patent/JP2007175780A/ja active Pending

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