FR3055232A1 - METHOD OF CUTTING A SHEATH REALIZED BY STAPLING A PROPELLER OF A METAL SHEET BAND - Google Patents

Abstract

The invention relates to a method of cutting a sheath made by folded stapling the edge of a helix of a sheet metal strip (1), intended to form an end of a first sheath section (1 ') and a second sheath section (1 ''), said stapling being disposed between two edges parallel to its longitudinal axis (A), this section being made by means of a cutting tool moved in a cutting direction. According to the invention, the section is deviated from said section direction at said stapling (2), to pass through the stapling (2) along a path (T1, T'1) inclined by an angle (α, a '). ) between 60 ° and 120 ° with respect to the longitudinal axis (A) of the stapling.

Description

© Publication number: 3,055,232 (to be used only for reproduction orders) © National registration number: 16 57878 ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY

COURBEVOIE © Int Cl ⁸ : B 23 K 26/08 (2017.01), B 21 D 51/16, E 04 F 17/04

A1 PATENT APPLICATION

©) Date of filing: 24.08.16. (© Priority: © Applicant (s): ATLANTIC CLIMATISATION & VENTILATION — TR. ®) Date of availability of the request: 02.03.18 Bulletin 18/09. @ Inventor (s): DEMIA LAURENT and MARTIN SEBASTIEN. ©) List of documents cited in the preliminary search report: See the end of this booklet (© References to other related national documents: ® Holder (s): ATLANTIC CLIMATISATION & VENTILATION. ©) Extension request (s): (© Agent (s): IPSILON Simplified joint-stock company.

PROCESS FOR CUTTING A SHEATH MADE BY STAPLING A PROPELLER OF A METAL SHEET STRIP.

FR 3 055 232 - A1

The invention relates to a method of cutting a sheath produced by folded stapling of the edge of a helix of a strip of metal sheet (1), intended to form an end of a first section of sheath (1 j and d 'a second section of sheath (1 said stapling being arranged between two edges parallel to its longitudinal axis (A), this cutting being carried out by means of a cutting tool moved in a cutting direction.

According to the invention, the section is deviated from said cutting direction at said stapling (2), to pass through the stapling (2) along a trajectory (T1, ΤΊ) inclined by an angle (a, aj between 60 ° and 120 ° with respect to the longitudinal axis (A) of the stapling.

PROCESS FOR CUTTING A NEVER ACHIEVED GAI BY STAPLING A HELI CE FROM A METALLIC OUE SHEET STRIP

The invention relates to a process for cutting a sheath produced by stapling a propeller of a strip of sheet metal, in particular a ventilation sheath intended to equip a ventilation installation.

As illustrated in FIG. 1, the manufacture of sheaths of circular or oblong section is carried out by continuous helical winding of a strip of metal sheet 1. Each turn 1A, 1 B, 1C ... is assembled to the next by a mechanical stapling 2 by crimping and deformation of the adjacent edges of the strip which are folded and recessed with one another.

This manufacture is generally carried out continuously by translation and rotation of the sheath and by means of a fixed stapling station for the edges of the propeller.

Whether the cutting of such a sheath is carried out using a rotary knob or by fusion for example using a plasma torch or a laser source, a needle is formed at the stapling sharp at the end of each cut sheath section, resulting from the partial release of the stapling plies after their cutting. This results in a danger of serious injury, throughout the transport, from the production operator to the final fitter on site, and the need to practice recovery in the production process, in order to cut these needles by means of '' cutting pliers.

It could be envisaged to weld this needle, which forms either inside or outside the end of the sheath section, on its sheath section, during cutting, but such a solution would be complex and would require the addition of an additional welding station. Alternatively, it could be envisaged to make a notch by punching this area, but this solution would also be complex to implement.

The invention makes it possible to eliminate this appearance of a cutting and dangerous needle by means of a specific and particularly simple cutting process.

To do this, the invention provides a process for cutting a sheath produced by folded stapling of the edge of a helix of a strip of metal sheet, intended to form an end of a first section of sheath and of a second section of sheath, said stapling being arranged between two edges parallel to its longitudinal axis, this cutting being carried out by means of a cutting tool moved in a cutting direction, characterized in that the cut is deviated from said cutting direction at said stapling, to cross the stapling along an inclined trajectory of an angle between 60 ° and 120 ° relative to the longitudinal axis of the stapling.

Thanks to this method, the appearance of the needle phenomenon resulting from the partial release of the staple folds during the cutting of sheath sections is avoided, the stapling remaining in the initial position folded thanks to its cutting along a trajectory. inclined at an angle of between 60 ° and 120 ° relative to the longitudinal axis of the stapling, and the risk of resulting injury is eliminated.

This results in a gain in productivity, since it is no longer necessary to cut these needles by means of cutting pliers.

According to a preferred embodiment, said inclined trajectory is perpendicular to the longitudinal axis of the stapling.

Preferably, the deviated cut is made, in the direction of said first sheath section, to then return to said plane by said inclined trajectory.

And advantageously, the cut deviates from said cutting direction along the first edge of said stapling encountered by the cutting tool.

Preferably, the cut returns in said plane substantially to the other edge of the stapling.

According to another preferred embodiment, the deviated cut is made, in the direction of said second sheath section, by said inclined path at the first edge of said stapling encountered by the cutting tool, to then return to said plane.

And preferably, the section returns in said plane along the other edge of said stapling.

Advantageously, two so-called deflected cuts are made opposite one another.

Advantageously, said cut (s) are preceded by a complete cut according to said plan.

Preferably, said cutting direction is arranged in a plane.

Said cutting tool is preferably a plasma torch or a laser source.

This type of fusion cutting avoids burrs caused by a knurling cut which is carried out by shearing the metal sheet. These burrs are real razor blades and require you to wear safety accessories.

The cutting can be carried out on a machine for continuously manufacturing the sheath by stapling the edge of a helix of a strip of metal sheet.

And preferably, the path of said cutting tool is arranged on a straight line parallel to the longitudinal axis of the sheath.

The invention also relates to a section of ventilation duct obtained using such a method.

Finally, the invention relates to a ventilation installation equipped with such sections.

The invention is described below in more detail with the aid of figures representing only preferred embodiments.

Figure 1 is a longitudinal sectional view of a sheath, produced by stapling a helix of a strip of metal sheet.

FIG. 2A is a front view of a first embodiment of the cutting method according to the invention.

FIG. 2B is a front view of a second embodiment of the cutting method according to the invention.

FIG. 2C is a front view of a third embodiment of the cutting method according to the invention.

As illustrated in FIG. 1, the invention relates to a process for cutting a sheath produced by folded stapling of the edge of a helix of a strip of metal sheet 1, intended to form an end of a first section of sheath and a second section of sheath. These ventilation duct sections are preferably intended to equip a ventilation installation.

The stapling is arranged between two edges parallel to its longitudinal axis A and this cutting is carried out by means of a cutting tool moved in a cutting direction.

According to the invention, the section is deviated from this cutting direction at the stapling 2, to pass through the stapling along an inclined trajectory of an angle between 60 ° and 120 ° relative to the longitudinal axis A helical stapling.

According to the embodiments now described, the cutting direction is arranged in a plane perpendicular to the longitudinal axis B of the sheath. But still according to the invention this cutting direction can be arbitrary.

A first embodiment of this cutting method is illustrated in FIG. 2A.

The cutting is therefore carried out there by means of a cutting tool moved in a cutting direction along a plane perpendicular to the longitudinal axis B of the sheath.

The section is deviated from this plane at the stapling 2, to cross the stapling along an inclined path T1 at an angle a between 60 ° and 120 ° relative to the longitudinal axis A of the stapling 2 More precisely, in this case, this inclined trajectory T1 is perpendicular to the longitudinal axis A of the stapling.

More precisely, the deviated cut is first carried out, here in the direction of the first sheath section Γ, to then return to the cutting plane by this inclined path T1. According to the example illustrated, the section deviates from the cutting plane along the first edge of said stapling 2A encountered by the cutting tool along the path T2. But this deviated cut T2 can also have any shape, or even not exist, the main thing being that it ensures a positioning of the cutting tool, in order to make the cut in line with the stapling along the inclined path. T1 at an angle a between 60 ° and 120 ° relative to the helical longitudinal axis A of the stapling.

Preferably, after the deviated trajectory T1, the cut returns to the cutting plane substantially on the other edge of the stapling 2B.

According to a variant, illustrated in dotted lines in FIG. 2A, the deviated cut can also be carried out first of all, here in the direction of the second sheath section, by the inclined trajectory T'1 at an angle a of between 60 ° and 120 ° relative to the helical longitudinal axis A of the stapling, at the first edge of the stapling encountered by the cutting tool, to then return to the cutting plane along the other edge of said stapling according to the trajectory T'2.

According to this first embodiment, a stapling triangle remains present either on the second section 1 "or on the first section Γ (in the case of the previous variant). However, this prominent triangle consists of a stable stapling in the folded position and does not present any specific danger.

According to a second embodiment illustrated in FIG. 2B, two such deviated cuts are made opposite one another.

The deviated cutting is then carried out, here in the direction of the first sheath section 1 ′, along the first edge of the stapling 2A encountered by the cutting tool along the path T2, to then return to the cutting plane by this inclined path T1 at an angle a between 60 ° and 120 ° relative to the helical longitudinal axis A of the stapling.

The deviated cut is also carried out, here in the direction of the second sheath section, by the inclined path ΤΊ at an angle a between 60 ° and 120 ° relative to the helical longitudinal axis A of the stapling, at this edge stapling 2A encountered by the cutting tool, to then return to the plane along the other edge of the stapling along the path T'2.

Alternatively, the cut at the stapling location can be made without interruption, in a loop, as described below.

The deviated cutting is carried out, here in the direction of the first sheath section 1 ′, along the first edge of the stapling 2A encountered by the cutting tool along the path T2, to then return to the cutting plane via this path inclined T1.

Then the cut is made along the other edge 2B of the stapling along the path T’2 to finally make the deflected cut, here in the direction of the second sheath section, by the inclined path ΤΊ.

In all cases, the stapling section between these two cuts is then detached and removed.

According to a third embodiment illustrated in FIG. 2C, these sections deviated opposite one another, previously described, are preceded by a complete section T3 according to the section plane and the two stapling triangles between these two cups are then detached and removed.

It should be noted that according to this third illustrated embodiment, the inclined paths T1 and ΤΊ are not perpendicular to the longitudinal axis A of the stapling, but inclined at an angle a, a 'of between 60 ° and 120 ° relative to the longitudinal axis of stapling A.

The cutting tool used is preferably a plasma torch or a laser source.

This cutting tool can be integrated into equipment carrying a fixed sheath, for example on site by means of a transportable or even portable device.

Preferably, however, the cutting is carried out on a machine for continuously manufacturing the sheath by stapling the edge of a helix of a strip of metal sheet, where the manufacture of the sheath is carried out continuously by translation and rotation of the sheath and by means of a fixed stapling station for the edges of the propeller. The trajectory of the cutting tool can then be arranged only on a straight line parallel to the longitudinal axis B of the sheath or present for more complex cuts one or two other axes of trajectory perpendicular to the longitudinal axis of the sheath

The cutting can also be carried out in several stages.

For example, in the case of the second embodiment, illustrated in FIG. 2B, the deviated cut can be made, here in the direction of the first sheath section Γ, along the first edge of the stapling 2A encountered by the tool cutting along the path T2, to then return to the cutting plane via this inclined path T1, and be completed by a complete cutting of the section which will detach from the second section. Then the cutting along the paths ΤΊ and T’2 is carried out in a second step on the second section which is potentially still integral on the winding machine.

This cutting tool consisting of a plasma torch or a laser source is fixed on one or more axes controlled digitally in a closed loop. An encoder wheel type sensor for example measuring the position or even the advancement speed of the sheath, the cutting tool is then controlled on the correct trajectory in real time. Supervision software determines this trajectory by means of specific calculation algorithms. This trajectory is determined for all the sheath diameters of the range manufactured commercially standardized. These algorithms are adaptive and allow corrections to the trajectory of the cutting tool in order to obtain an optimal cut.

Claims (15)

1. A method of cutting a sheath produced by folded stapling of the edge of a helix of a strip of metal sheet (1), intended to form one end of a first section of sheath (Γ) and of a second sheath section (1 ”), said stapling being arranged between two edges parallel to its longitudinal axis (A), this cutting being carried out by means of a cutting tool moved in a cutting direction, characterized in that the cutting is deviated from said cutting direction at said stapling (2), to pass through the stapling (2) along a trajectory (T1, ΤΊ) inclined by an angle (a, a ') between 60 ° and 120 ° relative to to the longitudinal axis (A) of the stapling. 2. Method according to claim 1, characterized in that said inclined trajectory (T1, ΤΊ) is perpendicular to the longitudinal axis (A) of the stapling. 3. Method according to claim 1 or 2, characterized in that the deviated cut is made, in the direction of said first section (Γ) of sheath, to then return to said plane by said inclined path (T1). 4. Method according to the preceding claim, characterized in that the section deviates from the plane along the first edge of said stapling (2) encountered by the cutting tool. 5. Method according to claim 3 or 4, characterized in that the section returns in said plane substantially on the other edge of the stapling. 6. Method according to claim 1 or 2, characterized in that the deviated cut is made, in the direction of said second section (1 ”) of sheath, by said inclined path (T” 1) at the first edge of said stapling encountered by the cutting tool, to then return to said plane. 7. Method according to the preceding claim, characterized in that the section returns in said plane along the other edge of said stapling (2). 8. Method according to one of claims 3 to 5 and according to claim 6 or 7, characterized in that two so-called deviated cuts are made opposite one another. 9. Method according to one of the preceding claims, characterized in that said one or more cuts (s) are preceded by a complete cut (T3) in said cutting direction. 10. Method according to one of the preceding claims, characterized in that said cutting direction is arranged in a plane. 11. Method according to one of the preceding claims, characterized in that said cutting tool is a plasma torch or a laser source. 12. Method according to one of the preceding claims, characterized in that the cutting is carried out on a machine for continuously manufacturing the sheath by stapling the edge of a helix of a strip (1) of metal sheet. 13. Method according to the preceding claim, characterized in that the trajectory of said cutting tool is arranged on a straight line parallel to the longitudinal axis of the sheath. 14. Section of ventilation duct obtained by the method according to one of the preceding claims. 15. Ventilation installation fitted with sections claim 14. according to 1/2