JP2007175780A - Rotary tool for in-line perforation of profiled product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device including rotary cutting tools for combining cutting and shaping operations on metal sheets. <P>SOLUTION: The device comprises rotary cutting tools for combining cutting and shaping operations on metal sheets, the density of the cuts preferably being very high, the cutting operations preferably being integrated into an automated shaping line, and comprises a first pair of rotary cutting tools (1, 2) producing a first set of cuts ( 7', 7") and a second pair of rotary cutting tools (3, 4) completing and finishing off the first cuts by a folding (8) in order to obtain dropped projections. In the device, the final cut is substantially rectangular and has a shape of the dropped projection. The first pair of rotary cutting tools (1, 2) form the cuts (7', 7") on three adjacent sides of the rectangle, and the second pair of rotary cutting tools (3, 4) form the fold (8) relative to the axis formed by the fourth side of the rectangle. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

FIELD OF THE INVENTION The present invention relates to a new method for combining cutting and shaping industrial operations, preferably in series.

  The invention also relates to a rotating tool which makes it possible to carry out this method.

The combination of technical state clipping and shape imparting operations is known in many industrial applications. These cutouts may be small or, in contrast, the cutout density may be very high. This is the case, for example, with shaped products for acoustics or with shaped products intended to act as cable rods.

  One technique for producing acoustical barriers is based on the use of a shaped metal finish with a surface with a large number of holes. Current methods generally consist of using either a porous shaped product with round holes with small diameters or a shaped product with otherwise recessed protrusions (or puncture holes). . The depressed protrusions are partial cutouts that leave cutout chips attached to the metal sheet, and these cutouts are generally rectangular. The shaped product described above is characterized by a very high density cut-out of the order of thousands of holes per square meter.

  Forming is among the most used technologies that allow cable rivets to be manufactured. In this case, the operations of clipping and shaping must be combined. The number of cutouts is lower than in the case of acoustic shaped products, but still very high.

  Other products such as uprights for metal shelves are generally manufactured from shaped products with cutouts. In this last example, the cutouts are much smaller in any case.

  Various methods are used to obtain these shaped products with a high or low number of cutouts. In fact, the two main groups of methods must be distinguished depending on whether the cutout is made by a press or by a rotating tool.

  Cutouts made by a press can be made before the shaping operation, off the shaping line, or by a press installed in the shaping line or even after the shaping operation.

  When the cutout is made before and away from the shaping line, there are many additional processing steps with considerable additional costs. When the press is placed in the shape-giving line, the cut-out operation greatly slows the shape-giving speed. Finally, the creation of cuts after shaping gives rise to restrictions on the placement of the cuts on the shaped product. Because of the access restrictions imposed by the clipping tool, it also has an adverse effect on productivity.

  Rotating tools provide an interesting alternative to the use of presses in the sense that they can be operated at a speed that matches the speed of the shaping line.

  Examples of such tools are patents (patent applications) GB-A-1044313, GB-A-1123536, US-A-1581236, US-A-13333704, US-A-3828636, US-A-3205744, US-A. -3709077, US-A-3438835, US-A-3274873, US-A-3066542 and US-A-5040395. The systems described in these various documents do not provide an adequate solution to the problem considered here. They are either intended only for cutting operations and not for hole formation, or they are very complex and expensive when many holes have to be made. Especially those problems are the discharge of very large amounts of litter resulting from pore formation.

  The alternative implemented in this case is therefore a depressed protrusion, which consists in creating a partial cut-out that leaves debris adhering to the metal sheet, which eliminates its discharge problem. This operation can be performed by a rotating tool, but it has other drawbacks. The lower knife is a disk, and a fine cutout is achieved only in a direction parallel to the movement of the metal sheet, the vertical side is rather torn, which may reduce resistance to rust. Furthermore, the litter remaining on the metal sheet prevents the production of the depressed protrusion in the area in contact with the shaping roller, which significantly reduces the relative surface of the shaped product from which the depressed protrusion is actually made. . In addition, because of the rotating tool technology, the scrap angle with respect to the plane of the metal sheet is closer to 45 ° than 90 °, which significantly reduces the visible aperture. Acoustic shaping products made by the technique of forming depressed protrusions thus give significantly worse performance than those made by drilling.

  U.S. Pat. No. 4,766,707 describes a machine that includes a first pair of rotating drums for drilling and a second pair of rotating drums for cutting a subsequent metal strip. According to the proposed installation, this machine follows a molding or folding machine to create clips intended for roofing panels. The first pair of tools creates a conical push or hole that serves to later receive a securing means such as a nail. The second pair of tools creates a transverse groove on each longitudinal edge of the strip and the two adjacent portions of the strip are now only loosely connected in the middle to favor subsequent easy separation of the clip. . The speed of both types of operations is significantly different.

  U.S. Pat. No. U.S. Pat. No. 1,931,468 describes a similar installation in which the movement of multiple pairs of rollers is coordinated by a gear driven system. Drilling in one or two operations is accomplished by a pair of rotating tools, one of which has a groove for the removal of cutout chips.

The object of the invention is to provide a solution which makes it possible to overcome the drawbacks of the prior art.

  In particular, the present invention either cuts a number of small sized holes on the shaping line or creates a depressed protrusion with an improved geometric shape without adversely affecting the shaping speed. The purpose is to propose a rotating tool technology that makes it possible.

Main features of the invention The present invention relates to a device comprising a rotary cutting tool for combining a cutting operation and a shaping operation on a metal sheet, the cutting density is preferably very high, said cutting operation preferably being automated Integrated into the shaping line, which completes and finishes the first set of cuts by folding to obtain a depressed projection and a first pair of rotary cutting tools that make the first set of cuts And two pairs of rotary cutting tools.

  According to the invention, the final cutout is essentially rectangular and in the form of a depressed protrusion, the first pair of tools making a cut on the three adjacent sides of the rectangle, The tool makes a fold about the axis formed by the fourth side of the rectangle.

  Preferably, the rotating tool is mounted on a shaft supported by a bearing, the shaft being perpendicular to the direction of movement of the metal sheet.

  Advantageously, the direction of rotation of the upper and lower tools is such that at the point of contact with the metal sheet, the tangential speed of the tool is in the same direction and essentially the same speed as the speed at which the metal sheet passes.

  As a particular advantage, the device includes means for ensuring relative positioning depending on the circumference of the teeth of the upper and lower tools of the first pair of circular tools, said means preferably tune the axis This is a gearbox that absorbs play.

  According to a particular embodiment of the device according to the invention, the first pair of tools comprises an upper tool comprising alternating rows of simple circular knives and spacers, and an alternating row of elements acting as simple circular knives and side knives. Including lower tool including. In addition, the second pair of tools includes an upper tool and a lower tool, each including an alternating row of simple circular knives and spacers.

  Advantageously, each simple upper circular knife includes a plurality of teeth around its circumference, the arc being associated with the same final cutout and made by a first pair of tools independently for each set of cuts Has a length equal to the distance between the two cuts. This simple circular knife, along with the second pair of tool spacers, has an essentially equal width, independent of each set of cuts.

  According to the present invention, the upper tool of the second pair of tools can be provided with round or smooth teeth at the level of the fold line, and has a set number that matches the fold.

The present invention also relates to a method for combining a forming operation of a depressed protrusion on a metal sheet and a shaping operation, wherein the forming operation of the depressed protrusion is preferably integrated into an automated shaping line and the next continuous Stage:
-A first pair of rotary cutting tools make a first set of U-shaped cuts forming a rectangle;
-A second pair of rotary cutting tools is intended to bend over and the folding axis is on the remaining side to form a set of rectangular cutouts in the form of a depressed projection;
Is characterized by

  As a special advantage, the method of the invention can combine the formation of cuts and the formation of depressed protrusions distributed along the metal sheet strip parallel to the direction of movement of the metal sheet on the same machine, The depressed protrusion is made in an area that does not contact the shaping tool.

  Advantageously, a rectangular cut formed with a perforated or depressed protrusion is displaced and the displacement between two adjacent cuts is the longitudinal pitch (Plg) divided by the displacement parameter X (X is not zero) be equivalent to.

  In actual use, the device of the present invention is used to make acoustic sound-absorbing bulkheads, to make cable wire rods, or even to make metal shelves.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a top view of a rotating tool system according to the present invention.

  FIG. 2 shows two tool elements belonging to a pair of rotating tools according to FIG.

  FIG. 3 shows an elevation view of a first pair of rotating tools according to the present invention.

  FIG. 4 shows two special embodiments of the teeth of the upper rotating tool shown in FIG.

  FIG. 5 shows details of the cut made by the first pair of tools according to a preferred embodiment of the present invention.

  FIG. 6 shows a detailed view of both tool elements belonging to the second pair of corresponding rotating tools of FIG.

  FIG. 7 shows an elevation view of a second pair of rotating tools according to the present invention.

  FIG. 8 shows an optimum layout for cutting out a metal sheet according to the present invention.

  FIG. 9 shows parameters that make it possible to define a cutout similar to the cutout shown in FIG.

  FIG. 10 shows an example of a cut-out view according to the present invention.

  FIG. 11 shows the details of the cut made by the first pair of tools according to the second preferred embodiment of the present invention alternately in the longitudinal and transverse directions, respectively.

  FIG. 12 shows the details of the simple folding tool teeth of the second pair of tools corresponding to the cut of FIG.

Detailed Description of the Invention The present invention is a two-step operation to ensure good quality of cuts in the case of cuts and easy discharge of debris or good quality of cuts in the case of recessed protrusions and folding. The purpose is to obtain either rectangular cutouts or recessed projections by dividing into two.

  The basic principle shown in FIG. 1 consists of using two consecutive pairs of rotating tools. In the case of hole cutting, this principle makes it possible to divide the cutting operation into two stages. On the one hand, the first pair of rotary knives make a transverse cut in the direction of movement of the metal sheet. On the other hand, the second pair makes a longitudinal cut to ensure easy waste removal. In the case of a cutout in the form of a depressed protrusion, the first pair of knives make a cut, for example on three sides. The second pair then folds the nicks, which makes it possible to obtain a significantly improved visible aperture compared to the prior art state. Furthermore, in the closely related prior art US-A-4766707, the continuous operations performed by the rotating tool (embossing or drilling, shearing) are performed in different areas and used for completely different purposes. ing.

  FIG. 1 shows a top view of this system. A first pair of rotating tools, including tools 1 and 2 attached to shafts 6 and 6 ', respectively, make a partial cut in the metal sheet without discharging debris. This cut is finished by a second pair of tools including tools 3 and 4 attached to shafts 6 "and 6" ', respectively. These shafts are supported by bearings mounted in a head similar to a shaping head (not shown). The direction of rotation of each tool is indicated by (B, B ′, B ″, B ′ ″). The metal sheet moves in the indicated direction A and is equal to the peripheral speed shared by the tools 1, 2, 3 and 4.

DESCRIPTION OF SOME PREFERRED EMBODIMENTS OF THE INVENTION FIGS . 2 and 3 show preferred embodiments of the rotating tools 1 and 2. In particular, FIG. 2 shows circular tool elements in the upper part 11 and the lower part 21, which make a cut 7 perpendicular to the direction of movement of the metal sheet 5 (see FIG. 5). As shown in FIG. 3, the upper tool 1 includes a simple circular tool 11 and a stack of spacers 12. These tool elements are mounted on the shaft 6, positioned and fixed on the shaft in the direction of rotation by elements such as pins. These elements are also fixed axially to ensure accurate positioning. The lower tool 2 also includes a stack of elements 21 facing the element 11 and separated by an element 22 that serves as a side knife when cutting the cut 7. Elements 21 and 22 are fixed in the direction of rotation and are positioned axially as in the case of the tool 1. Elements 11, 21 and 22 are preferably made from heat treated tool steel, as is the case with standard cutting tools.

  This method of construction of a rotating tool allows elements such as 11 or 21 to be made by wire-cutting a stack of disks made from heat-treated tool steel so that the tool can be manufactured economically Are particularly advantageous.

  The axial positioning of the tools 1 and 2 is ensured by a stop mounted on the shaft at the level of a bearing provided in the support head. The relative radial positioning of the teeth of the circular tools 11 and 21 is ensured by at least one gearbox that synchronizes the shafts 6 and 6 '. These are preferably gears that absorb play to ensure accurate positioning that matches each set of cuts. At least one of the shafts 6 or 6 'is motorized so as to ensure a rotating peripheral speed of the tool equal to the moving speed A of the metal sheet.

  FIG. 4 shows two embodiments of the tooth 111 or 111 ′ of the circular tool 11.

  After passing through the first pair of rotating tools, the metal sheet has a cut 7 as shown in FIG.

  Figures 6 and 7 show simple knives 31 and 41 performing a second cutting operation. The circular knife 31 has teeth 311 around it, and this arc has a length equal to the distance between two consecutive cuts 7 independently for each set of cuts. The complete upper circular tool 3 includes a stack of simple knives 31 separated by spacers 32. The axial and circumferential positioning of the knife 31 is ensured in the same way as that of the tools 1 and 2. In addition, the shaft 6 ″ is tuned with respect to the shaft 6 to ensure an accurate positioning of the cut 7 with respect to the knife 31. This tuning is achieved, for example, by a gear system.

  The tool 4 includes a stack of simple cutting discs 41 and spacers 42 (FIG. 7). Their axial positioning is ensured as in tools 1 and 2, and the relative positioning of tools 3 and 4 must be guaranteed only in the axial direction. The tool elements 11, 21, and 31 and the spacers 42 have an equal width independently for each set of cuts.

  Cutout chips can be discharged very easily between the discs 41, and possibly a comb with teeth that fit between the discs 41 can be provided to ensure that the scraps that get stuck between the cutting discs 41 are discharged. The waste is then discharged transversely, for example by means of a transport belt.

  FIG. 8 schematically shows the optimal arrangement of the cutouts. In fact, the subtle stage of this method is to apply an appropriate amount of cutting force, especially when cutting the cuts with tools 1 and 2. Therefore, to reduce this force, it may be beneficial to displace the cutout as shown in FIG.

  The parameters to be considered are shown in FIG. 9, which are: transverse pitch Ptr, longitudinal pitch Plg, transverse cut DecTr and longitudinal cut DecLg. For example, the cutout ratio, which is a parameter that determines the acoustic characteristics of the panel, is the ratio between the cutout surface area (DecTr × DecLg) and the pitch surface area (Plg × Ptr). A sufficiently high value is chosen for the parameter X which determines the displacement so as to reduce the axial force. In fact, the higher the value of parameter X, the fewer cutouts are made simultaneously, especially if X is not an integer.

  Another important parameter is the ratio between uncut longitudinal length, Plg-DecLg and displacement pitch, Plg / X. If this ratio is an integer, some of the first cutouts of the rectangular holes coincide with the second cutouts displaced by the number of rows equal to the ratio. In this case, the number of cuts made at the same time is relatively high, which imposes a relatively high bending load on the shaft, but the cuts made in pairs make up the radial forces on the knife to compensate for each other. The torque applied to is reduced. If the cutout parameter is chosen such that this ratio (Plg-DecLg) / (Plg / X) is not an integer, the number of cutouts made simultaneously will decrease, which will reduce the bending force but reduce the torque applied to the shaft. increase.

  Table 1 shows a suitable selection of parameters corresponding to a non-integer ratio, and FIG. 10 shows a simple example of a cutout pattern.

  The technique of the present invention also optimizes the cutout of the depressed protrusion, i.e. no material discharge.

  The technology of this tool is the same in principle. A U-shaped cut is made with the first pair of tools 1 and 2 as indicated by 7 '(longitudinal direction) or 7 "(transverse direction) in FIG. The form 111 teeth of the simple tool 11 are therefore adapted. A fold no longer cut as described above is made at 8 with a second pair of tools. Thus, the tooth 311 of the simple tool 31 is of course: rounded at the level of the folding edge and adapted to have a set number that matches the folding. FIG. 12 shows a typical view of this type of depressed protrusion for the longitudinal and transverse directions.

  For these various applications, the tool diameter will be specified by considering the material resistance that sets the dimensions of the shaft and also by the contact conditions with the metal sheet of the circular tool. Thus, the radius of tools 1 and 2 will preferably be equal to or greater than 100 times the thickness of the metal sheet. In the case of a depressed protrusion, different radii can be chosen for the tools 3 and 4, and the tool 4 has a much larger radius than the tool 3 to ensure good support for the metal sheet, for example during folding operations. Can do.

In one particular embodiment, the cut and depressed projection forming operation can be incorporated into a single machine along a belt parallel to the direction of movement of the metal sheet, and the depressed projection is a shape imparting tool and Located in a non-contact area.

Fig. 2 shows a top view of a rotating tool system according to the present invention. Fig. 2 shows two tool elements belonging to a first pair of rotating tools according to Fig. 1; Fig. 3 shows an elevation view of a first pair of rotating tools according to the invention. Figure 4 shows two special embodiments of the teeth of the upper rotating tool shown in Figure 3; Fig. 4 shows details of a cut made by a first pair of tools according to a preferred embodiment of the present invention. Fig. 2 shows a detailed view of both tool elements belonging to the second pair of corresponding rotating tools of Fig. 1; Fig. 3 shows an elevation view of a second pair of rotating tools according to the invention. Fig. 3 shows an optimum layout for cutting out a metal sheet according to the invention. Fig. 9 shows parameters that make it possible to define a cutout similar to the cutout shown in Fig. 8; The example of the cut-out figure by this invention is shown. Fig. 5 shows details of cuts made by a first pair of tools according to a second preferred embodiment of the invention, alternately in the longitudinal and transverse directions, respectively. FIG. 12 shows tooth details of a simple folding tool of the second pair of tools corresponding to the cut of FIG.

Claims (15)

  An apparatus including a rotary cutting tool for combining a cutting operation and a shaping operation of a metal sheet, preferably the cutting density is very high, the cutting operation is preferably integrated into an automated shaping line, A first pair of rotary cutting tools (1, 2) to make a first set of cuts (7 ', 7 ") and a first set of cuts by folding (8) to obtain a depressed projection And a second pair of rotary cutting tools (3, 4) to be finished, the final cut-out being essentially rectangular and in the form of a depressed projection, said first pair of tools (1 , 2) make cuts (7 ', 7 ") on three adjacent sides of the rectangle, and the second pair of tools (3,4) is related to the axis formed by the fourth side of the rectangle Characterized by making a fold (8) That equipment.   The rotating tool (1, 2, 3, 4) is mounted on shafts (6, 6 ', 6 ", 6"') supported by bearings, and these shafts are in the direction of movement of the metal sheet (A The device according to claim 1, wherein the device is perpendicular to.   The rotational direction and rotational speed of the upper tool (1, 3) and the lower tool (2, 4) are such that the tangential speed of the tool at the point of contact with the metal sheet is the same direction and essentially the same as the passing speed of the metal sheet. Device according to claim 1 or 2, characterized in that they are of the same size.   Means for ensuring relative positioning depending on the circumference of the teeth (111, 111 ', 211, 211') of the upper tool (1) and lower tool (2) of said pair of circular tools 4. The device according to claim 1, wherein said means is preferably a gearbox that absorbs play in order to tune the shaft (6, 6 ').   A first pair of tools (1, 2) acts as an upper tool (1) comprising alternating rows of simple circular knives (11) and spacers (12), simple circular knives (21) and side knives. Device according to any one of claims 1 to 4, characterized in that it comprises a lower tool (2) comprising alternating rows of elements (22).   The second pair of tools (3, 4) includes an upper tool (3) and a lower tool (4), each of which includes alternating rows of simple circular knives (31, 41) and spacers (32, 42). 6. A device according to any one of the preceding claims, characterized in that   Each upper simple circular knife (31) includes teeth (311) around it, the arc of which is associated with the same final cutout independently for each set of cuts and a first pair of tools (1,2 The device according to claim 6, characterized in that it has a length equal to the distance between the two cuts (7) made by.   8. The second pair of tools, the simple circular knives (11, 21, 31) and the spacers (42) are of equal width independently for each set of cuts. Device.   The upper tool (3) of the second pair of tools is provided with teeth (311) having a set that is rounded or smooth at the level of the fold line and coincides with the fold. The apparatus according to 1. A method for combining a forming operation of a depressed projection of a metal sheet and a shape imparting operation, wherein the cutout operation is preferably integrated in an automated shape imparting line, using the apparatus according to claim 1. In the process for the following successive stages:
-A first pair of rotary cutting tools (1, 2) make a first set of U-shaped cuts (7 ', 7 ") forming a rectangle;
The second pair of rotary cutting tools (3, 4) make a fold (8), the fold axis being on the remaining side to form a rectangular cutout in the form of a set of depressed protrusions Intended;
A method characterized by.   Incorporating the cut-out forming and the forming operation of the depressed protrusion along the strip of metal sheet parallel to the direction of movement of the metal sheet on a single machine, in the area where the depressed protrusion does not contact the shaping tool The method according to claim 10, wherein:   A cut-out formed with a rectangular depressed protrusion is displaced, the displacement between two adjacent cut-outs being equal to the longitudinal pitch (Plg) divided by a non-zero displacement parameter X. 10. The method according to 10.   A method of using the device according to any one of claims 1 to 9 for producing a partition wall having acoustic absorption properties.   10. Use of the device according to any one of claims 1 to 9 for making a cable rivet.   Use of the device according to any one of claims 1 to 9 for making metal shelves.

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