EP2819808A1

EP2819808A1 - Method and device for producing a sound-absorbing panel

Info

Publication number: EP2819808A1
Application number: EP13712837.7A
Authority: EP
Inventors: Philippe Kerdraon; Wei CHE
Original assignee: Saint Gobain Glass France SAS; Compagnie de Saint Gobain SA
Current assignee: Saint Gobain Glass France SAS; Compagnie de Saint Gobain SA
Priority date: 2012-03-01
Filing date: 2013-02-25
Publication date: 2015-01-07
Anticipated expiration: 2033-02-25
Also published as: WO2013128103A1; FR2987634A1; CN104159705A; EP2819808B1; CN104159705B; FR2987634B1

Abstract

The invention concerns a method for producing a sound-absorbing panel, comprising the following steps: -providing a glass plate, -forming a plurality of through-slots with a width of between 0.2 and 1.0 mm in the plate by machining with at least one diamond cutting disc. The invention can be used to produce a sound-absorbing panel quickly and economically.

Description

METHOD AND DEVICE FOR MANUFACTURING AN ABSORBING PANEL

ACOUSTIC

A method and apparatus for manufacturing an acoustic absorbent panel, particularly a glass panel having a plurality of slots.

Such acoustic absorbent panels are well known and arise in buildings as a partition or along a partition or ceiling, with or without space in relation to the partition or ceiling.

The slots of such a type of acoustic absorbent panel are generally straight, or oblong or wavy, typically between 0.1 and 2 mm.

It is known to form such slots by laser etching. However, this technique is very expensive and slow to implement.

There is therefore a need for a method for making an acoustic absorbent panel that is quick and inexpensive.

For this, the invention provides a method for manufacturing an acoustic absorbent panel, comprising the following steps:

- supply of a glass plate,

- Formation of a plurality of through slots in the plate by machining with at least one diamond disc.

According to another feature, in the slot forming step, the plurality of slots is formed by machining by a plurality of diamond disks.

According to another feature, in the step of forming the slots, each diamond disc is watered with water to cool and clean the diamond disc.

According to another feature, in the slot forming step, the plate is positioned so that each diamond disk is facing a single place on the plate to form a single slot.

According to another feature, in the slot forming step, the plate is positioned so that each diamond disk is facing a first location on the plate to form a first slot and, once the first slot is formed, the plate is removed from the diamond disc (s) and repositioned so that each diamond disk is facing at least a second location of the plate so as to form at least a second slot.

According to another feature, in the slot forming step, the slots are formed parallel to each other, on the same line or staggered.

In another feature, in the slot forming step, a plurality of slots are formed parallel to a direction and then a plurality of slots are formed parallel to another direction different from said direction.

According to another feature, the method further comprises, before the step of forming the slots, a step of decorating the plate with ink, paint or varnish resistant to water.

The invention also relates to a device for implementing the method described above for manufacturing an acoustic absorbent panel, comprising:

a means for holding a glass plate,

at least one shaft rotatably held at at least one of its ends, each shaft bearing at least one diamond disk adapted to form by machining at least one through slot in the plate.

According to another feature, each shaft carries a plurality of diamond discs, each diamond disc being adapted to form at least one through slot in the plate.

In another feature, each shaft is rotatably held at both ends.

According to another feature, the device further comprises at least one water jet associated with each diamond disc, each jet of water being adapted to water the diamond disc from above or from below.

According to another feature, the device further comprises means for translating the plate holding means in first and second directions, which are different. According to another feature, the means for translating the plate holding means are adapted to translate the means for holding the plate vertically and horizontally.

In another feature, the plate holding means is a panel to which the plate is attached, the panel being provided with a plurality of slots at corresponding locations where slots are to be formed in the plate.

In another feature, the diamond discs carried by two adjacent trees are arranged in line or staggered.

The invention also relates to a use of the device described above for manufacturing an acoustic absorbent panel consisting of a glass plate, provided with a plurality of slots of width between 0.2 and 1.0 mm with a percentage of slit area in relation to the total panel area of between 0.5 and 5%.

The invention also relates to an acoustic absorbent panel consisting of a glass plate, provided with a plurality of slots of width between 0.2 and 1.0 mm with a percentage of slit surface with respect to the total surface of the panel between 0.5 and 5%.

The invention also relates to a partition or a ceiling or a wall or ceiling element comprising at least one acoustic absorbent panel described above.

Other features and advantages of the invention will now be described with reference to the drawings in which:

• Figure 1 shows a side view of a device according to the invention;

• Figures 2 and 3 show a top view of a device according to the invention with diamond discs respectively aligned and staggered.

The reference numbers which are identical in the different figures represent identical or similar elements.

The invention relates to a method for manufacturing an acoustic absorbent panel provided with a plurality of slots. The method comprises a step of providing a glass plate. The method also includes a step of forming a plurality of through slots of width between 0.2 and 1.0 mm in the plate by machining with at least one diamond disc.

Machining with at least one diamond disc makes the process less expensive, a diamond disc being much cheaper than a laser head. In addition, the use of a diamond disc is simpler than that of a laser head, which makes cuts in following digitized trajectories, which makes it possible to manufacture the acoustic absorbent panel more quickly. Finally, it is quite innovative to make slots so small width with a diamond disc.

The invention also relates to a device for manufacturing an acoustic absorbent panel. The device makes it possible to implement the method according to the invention.

FIG. 1 represents a side view of a device according to the invention. The device comprises a housing 1 holding at least one shaft 2 adapted to rotate about its axis and on which is mounted at least one diamond disk 3. Each shaft 2 is rotatably held at one of its ends to the housing 1. The diamond disc (s) 3 are preferably mounted on each shaft 2 so that the center of the diamond disk (s) 3 is on the axis of symmetry of the shaft 2. Thus, when each shaft 2 is rotating around its axis, the housing 1 being stationary, the shaft 2 rotates or diamond discs 3 located thereon. The casing 1 comprises a motor (not shown) adapted to drive the shaft or shafts 2 in rotation about their axis, with for example an electronic control system of the motor.

Each diamond disc 3 is metallic and has a plurality of diamonds on the periphery of the disc. The diamonds are attached to the metal disk by a metal binder ("metal bond"). Preferably, the diamonds have a size of between 40 and 60 μιτι. The concentration of diamonds is preferably between 30 and 75%. There is a compromise to be found because the larger the diamond size, the longer the diamond disc can be used, but the more the diamond disc is fragile. Likewise, the greater the concentration of diamonds, the more efficient the machining, but the more fragile it is. The concentration of diamonds is defined as four times the volume percentage of diamonds in the set diamonds + metal binder. Preferably, each diamond disc is framed, on each of its sides, by a rigid disc of diameter less than that of the diamond disc. The rigid disks are for example ceramic or steel. They help prevent bending of the disc to prevent the disc from breaking.

Preferably, the diamond discs are regularly sharpened with an abrasive so as to overcome wear due to friction.

Each diamond disc 3 is adapted to cut at least one slit of width between 0.2 and 1.0 mm through a glass plate 4 so as to form an acoustic absorbent panel provided with a plurality of slots. The diamond disk 3 must be chosen with a thickness corresponding to the width of the desired slot.

The glass plate can be in all kinds of glass, for example soda-lime glass or borosilicate glass. It may be a single sheet of glass or a laminated glazing comprising two sheets of glass between which is disposed an interlayer, for example a PVB film.

The device further comprises means 5 for holding a plate 4, preferably made of glass. The holding means 5 holds the plate 4 so as to prevent it from moving when the diamond disk (s) 3 are forming the slots in the plate 4. The holding means 5 is preferably a panel, for example made of wood or plastic, on which the plate 4 is placed and held fixed, during the formation time slots, for example by flanges and / or suction cups. In the rest of the description, we will name the means of maintenance "panel", without it being considered as a limitation.

The panel 5 is provided with a plurality of preformed slots at the corresponding locations where slots are to be formed in the plate 4, so as to prevent each diamond disk from forming a slot in both the plate 4 and the 5. The fact of having a panel-shaped holding means makes it possible to withstand the forces exerted on the plate 4 during machining so that the plate 4 does not deform under the plate. effect of said efforts.

The plate 4 is adapted to be translated in a first direction (shown in Figure 1 by the arrow 6), which is the direction perpendicular to the plate plan. Thus, the plate 4 can be moved to the diamond disk (s) 3 so that the diamond disk (s) can form slits in the plate. The plate can also be moved away from the diamond disk (s) 3 when the machining operation is completed.

The plate 4 is also adapted to be translated in a second direction, which is perpendicular to the first direction, and which is parallel to the plane of the plate 4. This second direction corresponds to the direction in which the slot must be made.

The translations of the plate 4 according to the first and second directions are carried out for example by a table (not shown) supporting the panel 5 and the plate 4, the table being translatable along a first axis parallel to the first direction and along a second axis parallel to the second direction. The translation movements of the table according to the first and / or second direction can be carried out either manually or mechanically, for example with an electronic system for controlling the translation movements of the table to produce the acoustic absorbent panel. with slots.

Preferably, the plate 4 is maintained in a horizontal position on the holding means 5. The shaft 2 is then preferably horizontal, with one or more diamond discs in a vertical plane. The first direction of translation of the plate 4 is then vertical and the second direction of translation of the plate 4 is then horizontal.

The translation amplitude of the plate 4 in the first direction must be sufficient both to form a through slot in the plate 4 and to provide place and clear without difficulty the plate 4 in the device. The plate 4 can be positioned between two extreme positions: a rest position, position in which the plate can be removed or placed without difficulty for the user, and a working position (in dashed lines in FIG. 1), in which the or the diamond discs completely traverse the plate 4 to form the slots. In the working position, the diamond disk (s) also pass through at least part of the slots of the panel 5.

The translation amplitude of the plate 4 in the second direction must be adapted to the length of the slots that it is desired to make, that is to say a length of at least 40 mm. In the case where several rows of slots must be made in the plate by the diamond disc (s) 3 of a single shaft

2, the translation amplitude of the plate 4 in the second direction must be at least the width or the length of a plate 4, for example 1 m for a square plate of 1 m ² , so as to provide the different rows of slots in a panel with a device according to the invention without having to reposition the plate 4 differently on the table during machining of the plate 4.

In the present description, the term "slot row" refers to a succession of slots made by the slots of a single shaft, the diamond discs being arranged perpendicularly to the shaft.

Note that in the case where several rows of slots must be made in the plate by a single diamond disk 3 of a single shaft 2, the diamond disk must be moved on the shaft 2 between two machining operations of two slots d 'same row.

Each diamond disc 3 is adapted to form a single slot or a plurality of slots in the plate 4. However, the more diamond discs on the shaft 2, the faster the machining operation because several slots can to be performed simultaneously. Thus, the shaft 2 can carry a single diamond disk

3, or two diamond discs 3, or a plurality of diamond discs.

Preferably, the device according to the invention comprises at least two shafts 2, parallel to each other, and more preferably a plurality of shafts 2 parallel to each other, so as to increase the speed of manufacture an acoustic absorbent panel with slits. Each shaft 2 carries a single diamond disc 3, or two diamond discs 3, or a plurality of diamond discs.

The length of a slot is defined as the greatest length of the slot over the entire thickness of the slot, and therefore the plate. Indeed, the diamond disk being disk-shaped, the ends of the slot may not have vertical edges but curved, the same radius of curvature as the diamond disc. The length of the slots is preferably such that the ratio of the slit surface area of a plate to the total area of the slab is between 0.5 and 5%. This represents, for example, for a square plate of 1 m ² , 1000 slots of 10 cm in length and 0.2 mm in width, with 10 mm between two rows of slots and 9.8 mm between two slots of the same row. A good compromise must be found for the length of the slots, so that the mechanical strength of the panel is not affected. In this case, the device preferably comprises nine shafts each carrying 99 diamond disks if a 9.9 mm gap is left at each end of each row of slots with respect to the edge and a space of 0.5 cm is left between the rows of slots closest to the edge and the edge.

The device is adapted to make slots of different lengths on the same plate, especially when the slots are not all made at the same time.

When the device according to the invention comprises at least two shafts, the diamond disks borne by two adjacent shafts are arranged in alignment, as can be seen in FIG. 2, or in staggered rows, as can be seen in FIG. the slots on the sound absorbing panel can be aligned or staggered, allowing the pattern to be adapted to the wishes of the end user.

The distance between two adjacent shafts 2 is preferably constant over the entire device, so as to have a regular pattern of slots.

The device according to the invention preferably comprises a second housing 7 adapted to rotateably hold the shaft (s) 2 at their opposite end to that maintained by the housing 1. Maintaining the shaft (s) 2 at their two ends prevents the tree (s) from being cantilevered. This second case is not motorized.

The device also comprises at least one pair of water jets 8, 9, each pair of water jets 8, 9 being adapted to water a single diamond disc with a water jet 8 from above and a jet of water. water 9 from below. The watering from below is done for example through the slots made in the panel 5, or directly if the diamond disk has passed through the plate 4 and the panel 5. The device comprises for example a tray 10 filled with water, arranged under the means 5 for holding the plate 4, which serves as a water reservoir for watering the diamond discs. The water jets 8 for the above watering come for example from holes made in a pipe 1 1 located above the shaft 2. The watering of the diamond discs 3 by the jets of water 8 located at above or trees 2 prevents heating of the diamond discs, so as not to damage the plate 4, and the watering of the diamond discs 3 by the water jets 9 located below the shaft or 2 allows to clean the teeth of the diamond discs, which is particularly useful when each diamond disc must make at least two slots in the same plate. Alternatively, the device includes water jets for watering only from below or streams of water to water only from above.

As an alternative to the embodiment described above, the plate 4 is stationary and it is the housing 1, and optionally the housing 7, which can be translated in vertical and horizontal directions.

The invention also relates to the method of manufacturing an acoustic absorbent panel provided with slots using the device of the invention.

The method comprises a step of providing a glass plate 4. The glass plate 4 may be transparent, which is advantageous for producing, for example, partitions or ceilings which must be transparent. Alternatively, the glass plate is translucent and / or colored and / or satin and / or diffusing. The glass plate 4 preferably has a thickness of between 3 and 12 mm.

The method also comprises a step of forming a plurality of through slots with a width of between 0.2 and 1.0 mm in the plate 4 by machining with at least one diamond disc 3.

The speed of rotation, the speed of ascent and descent, the speed of advance, the size and the concentration of diamonds of the diamond discs are important parameters. Thus, we made slits in a single 6 mm thick sheet of glass with a plurality of diamond discs (diameter 127 mm, diamond concentration 30%, diamond size 40/60 μιτι) rotating at a speed of 9000 rpm, with a rise / fall speed of 12 mm / min and a forward speed of 75 mm / min.

The plate 4 is fixed to the holding means 5 of the device according to the invention. Then the shaft (s) 2 are rotated, rotating the diamond disc (s) 3. The plate 4 is translated in the second direction so as to position it so that the diamond disc (s) 3 are in the right place by compared to the plate 4 to make the slots. Then the plate 4 is translated in the first direction (perpendicular to the plate), in direction of the diamond disc (s) 3, until the diamond disc (s) have passed through the thickness of the plate (4) and at least a portion of that of the panel (working position), and then the plate (4) is translated according to the second direction (parallel to the plate) until the length of the slot is the desired one. Then, the plate 4 is again translated in the first direction to move away from the diamond disc (s) 3. In the case where the device comprises only one shaft 2, the plate 4 is then translated in the second direction to position it so that the diamond disc (s) 3 are positioned at a second appropriate location with respect to the plate 4 to make other slots. And so on.

Each diamond disc can form a single slot or several slots. Preferably, all the slots of a plate 4 are of the same width and the same length, without being limiting. If the device according to the invention comprises a single shaft 2, each diamond disc 3 will form several slots. If the device according to the invention comprises several shafts 2, each diamond disc 3 may form only one slot. Thus, the plate can be positioned so that each diamond disk 3 is facing a single point of the plate to form a single slot. The set of slots of the plate 4 is then produced simultaneously, which makes it possible to manufacture an acoustic absorbent panel in a very fast manner, for example in ten seconds. Or, the plate can be positioned so that each diamond disk 3 is facing a first location on the plate 4 to form a first slot and, once the first slot is formed, the plate is removed from the diamond disk to be positioned so that the diamond disk is facing a second location of the plate so as to form a second slot, and so on until the number of slots required.

During the slot forming step, the slots are formed parallel to each other, aligned or staggered, according to the arrangement of the diamond discs which are themselves aligned or staggered on the different shafts 2 of the device according to the invention .

The method according to the invention makes it possible to produce a plurality of slots parallel to a direction and a plurality of slots parallel to another direction, these two directions being preferably perpendicular to each other. Indeed, the method according to the invention can be used a first time to make a first set of slots parallel to each other, then a second time, by rotating the plate by 90 ° for example between the first and the second use, to make a second set of slots then perpendicular to the slots of the first set of slots. Thus, an acoustic absorbent panel with cross-shaped slits can be obtained. Alternatively, it is possible to make slits in the form of chevrons.

During the rotation of the diamond discs, and in particular during the machining of the slots, each diamond disc is sprinkled with one or two jets of water to cool and clean the diamond disc, as explained above for the device.

Prior to the slit forming step, the method may include a step of decorating the plate with water-resistant ink, paint, or varnish.

The invention also relates to the use of the apparatus according to the invention for manufacturing, according to the method according to the invention, an acoustic absorbent glass panel, provided with a plurality of slots of width between 0.2 and 1. , 0 mm with a percentage of slit area relative to the total panel area of between 0.5 and 5%.

Acoustic absorbent panel is a plate 4 provided with slots as described above. The panel 5 is simply a means of holding the plate during manufacture of the slots but is not part of the acoustic absorbent panel consisting of the plate 4 provided with slots.

The invention also relates to an acoustic glass absorbent panel provided with a plurality of slits having a width of between 0.2 and 1.0 mm, with a percentage of slit area relative to the total panel area of between 0 and 0.2 mm. , 5 and 5%. The acoustic absorbent panel is manufactured according to the method of the invention, by means of the device according to the invention. The acoustic absorbent panel may constitute or be part of a partition or a ceiling, for example by being fixed to a partition or a ceiling in order to acoustically isolate a room, this fixing being able to be carried out with or without space between the sound absorbing panel and partition or ceiling. The acoustic absorbent panel is constituted for example by a glass plate 1 m ² , comprising 1000 slots 10 cm long and 0.2 mm wide, with 10 mm between two rows of slots and 9.8 mm between two slots of the same row. A plurality of such panels will have to be placed next to each other to form an acoustical partition or ceiling or to insulate a room by attachment to an existing partition or ceiling.

The invention thus makes it possible to manufacture an acoustic absorbent panel quickly and inexpensively, with a simple and fast device of use, to manufacture an acoustically efficient panel which is also more inexpensive.

Claims

1. A method for manufacturing an acoustic absorbent panel, comprising the steps of:

- supply of a glass plate (4),

- forming a plurality of through slots of width between 0.2 and 1.0 mm in the plate (4) by machining with at least one diamond disk (3).

The method of claim 1, wherein, in the slot forming step, the plurality of slots is formed by machining by a plurality of diamond disks (3).

3. The method of claim 1 or 2, wherein in the step of forming the slits, each diamond disc (3) is sprinkled with water to cool and clean the diamond disc (3).

4. Method according to one of claims 1 to 3, wherein in the step of forming the slots, the plate (4) is positioned so that each diamond disc (3) is facing a single place on the plate (4) to form a single slot.

5. Method according to one of claims 1 to 3, wherein in the step of forming the slots, the plate (4) is positioned so that each diamond disc (3) is facing a first place on the plate (4) to form a first slot and, once the first slot is formed, the plate (4) is moved away from the diamond disk (s) (3) and repositioned so that each diamond disk (3) is facing at least at a second location of the plate (4) so as to form at least a second slot.

6. Method according to one of claims 1 to 5, wherein in the slot forming step, the slots are formed parallel to each other, on the same line or staggered.

The method according to one of claims 1 to 6, wherein, in the slit forming step, a plurality of slits are formed parallel to a slit direction then a plurality of slots are formed parallel to another direction different from said direction.

8. Method according to one of claims 1 to 7, further comprising, before the step of forming the slots, a step of decorating the plate (4) with ink, paint or varnish resistant to the water.

9. Device for implementing the method according to any one of claims 1 to 8 for manufacturing an acoustic absorbent panel, comprising:

a means for holding (5) a glass plate (4),

- At least one shaft (2) rotatably held at at least one of its ends, each shaft (2) carrying at least one diamond disc (3) adapted to form by machining at least one through slot of width between 0, 2 and 1.0 mm in the plate (4).

10. Device according to claim 9, wherein each shaft (2) carries a plurality of diamond discs (3), each diamond disc being adapted to form at least one through slot in the plate (4).

1 1. Device according to claim 9 or 10, wherein each shaft (2) is rotatably held at both ends thereof.

12. Device according to one of claims 9 to 1 1, further comprising at least one water jet (8, 9) associated with each diamond disc (3), each jet of water (8, 9) being adapted to water the diamond disc (3) from above or below.

13. Device according to one of claims 9 to 12, further comprising means for translating the means (5) for holding the plate (4) in a first and a second direction, which are different.

14. Device according to claim 13, wherein the means for translating the means (5) for holding the plate (4) are adapted to translate the means (5) for holding the plate (4) vertically and horizontally.

15. Device according to claim 13 or 14, wherein the means (5) for holding the plate (4) is a panel on which is fixed the plate (4), the panel being provided with a plurality of slots at the locations where slits are to be formed in the plate (4).

16. Device according to one of claims 9 to 15, wherein the diamond discs (3) carried by two adjacent shafts (2) are arranged in line or staggered.

17. Use of the device according to one of claims 9 to 16 for manufacturing an acoustic absorbent panel consisting of a plate (4) made of glass, provided with a plurality of slots of width between 0.2 and 1.0 mm with a slit surface percentage relative to the total area of the plate (4) of between 0.5 and 5%.