EP3870766A1 - Procede de depose d'un cordon de mousse expansee avec un robot et robot associe - Google Patents
Procede de depose d'un cordon de mousse expansee avec un robot et robot associeInfo
- Publication number
- EP3870766A1 EP3870766A1 EP19813095.7A EP19813095A EP3870766A1 EP 3870766 A1 EP3870766 A1 EP 3870766A1 EP 19813095 A EP19813095 A EP 19813095A EP 3870766 A1 EP3870766 A1 EP 3870766A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- periods
- durations
- absence
- deposition
- foam
- 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.)
- Withdrawn
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/35—Extraordinary methods of construction, e.g. lift-slab, jack-block
- E04B1/3505—Extraordinary methods of construction, e.g. lift-slab, jack-block characterised by the in situ moulding of large parts of a structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/022—Foaming unrestricted by cavity walls, e.g. without using moulds or using only internal cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/84—Walls made by casting, pouring, or tamping in situ
- E04B2/86—Walls made by casting, pouring, or tamping in situ made in permanent forms
- E04B2/8605—Walls made by casting, pouring, or tamping in situ made in permanent forms without spacers
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/04—Devices for both conveying and distributing
- E04G21/0418—Devices for both conveying and distributing with distribution hose
- E04G21/0445—Devices for both conveying and distributing with distribution hose with booms
- E04G21/0463—Devices for both conveying and distributing with distribution hose with booms with boom control mechanisms, e.g. to automate concrete distribution
Definitions
- TITLE METHOD OF REMOVING A FOAM CORD
- the present invention relates to the field of automatic removal of expanded foam, in particular polyurethane foam, using a robot.
- expanded foam such as for example polyurethane foam
- the formwork formed by two distant layers of expanded foam, is obtained by stacking successive layers of expanded foam using a poly-articulated industrial robot.
- the foam is deposited in a non-solid form, after hardening and expansion of the previous layer (lower layer).
- concrete is poured between the two walls of the formwork to make the structuring wall of the wall.
- the conditions for manufacturing the expanded foam and the conditions for its removal by the robot must be perfectly controlled and controlled.
- the foam results from the chemical polymerization reaction of an isocyanate with groups carrying a mobile hydrogen (mainly hydroxyl groups which are found in the polyol).
- the foaming can be modeled as the expansion of a compressible shear-thinning fluid in which a gas phase is mixed. Its thermomechanical behavior depends on the gas rate and the rheological properties of the polymer matrix. In the end, the quality of the expanded foam bead obtained depends on the control of the foaming operation and the parameters of removal.
- the foam bead must have a homogeneous composition with a substantially constant section to form a wall of substantially constant section.
- the speed of movement of the robot varies during the process of depositing the foam, in particular when the robot must follow a trajectory comprising a straight portion followed by a curved portion.
- the speed of movement of the robot is reduced in the curved portion (compared to the speed of movement in the straight portion) due to the increase in the number of points on the path and the potential acceleration limit of the robot.
- the number of points generally increases.
- the localized increase induces a smaller difference between points, which can result in a reduction of the speed setpoint.
- the section of the foam bead therefore varies when the speed of movement of the robot varies.
- An object of the invention is to propose a method for depositing expanded foam allowing the section of the deposited foam strip to be simply controlled when the robot's speed of movement varies.
- an object of the objection is to propose a new mechanism for controlling the section of the foam bead.
- a chopping mechanism intended to deposit the expanded foam discontinuously to guarantee a substantially constant section of the foam bead.
- the invention relates to a method of depositing a bead of expanded foam on a support via a robotic system which follows a trajectory comprising a straight portion traversed by the robotic system at a speed V, followed by a curved portion traversed by the system robotized at reduced speed V rec n characterized in that the foam is deposited discontinuously when the robotized system follows the curved portion at reduced speed V redr by alternating periods of deposit and periods of absence of deposit of expanded foam, the durations T1 of the deposition periods and the durations T2 of the periods of absence of deposition being controlled in order to obtain a continuous bead of predefined constant section, and in that the durations T1 of the deposition periods and the durations T2 of the periods of absence of deposit satisfy the relationship:
- durations T1 of the periods of deposit and the durations T2 of the periods of absence of deposit can satisfy the relation:
- the support can be a concrete slab or a previously deposited strip of foam (or a previously deposited layer).
- the duration of each deposition period and / or each period of absence of deposition is less than 15 ms.
- the expanded foam bead is deposited at a speed predefined by the robotic system and the duration of the periods of deposition and periods of absence of deposition is defined as a function of said predefined speed.
- the invention also relates to a robotic system for depositing a bead of expanded foam on a support comprising an extrusion nozzle of said foam, said extrusion nozzle following a trajectory comprising a rectilinear portion traversed by the extrusion nozzle with a speed V, followed by a curved portion traversed by the extrusion nozzle at a reduced speed V rec n characterized in that said extrusion nozzle is controlled to deposit foam discontinuously when the extrusion nozzle follows the curved portion to the low speed V rec u alternating periods of removal and periods of absence of deposited foam expanded, Tl durations of time for removing and durations T2 periods absence of deposition being controlled to obtain a continuous bead of predefined constant section, and in that said extrusion nozzle is controlled so that the durations T1 of the deposition periods and the durations T2 of the absence of deposition periods satisfy the relationship :
- Said extrusion nozzle can thus be controlled so that the durations T1 of the deposition periods and the durations T2 of the periods of absence of deposition satisfy the relationship:
- the extrusion nozzle is controlled so that the duration of each deposition period and / or each period of absence of deposition is less than 15 ms.
- the robotic system deposits the expanded foam bead at a predefined speed and the duration of the periods of deposit and periods of absence of deposit is defined in particular as a function of said predefined speed.
- FIG. 1 represents a curve illustrating the discontinuous process of depositing expanded foam according to the invention
- FIG. 2 is a simplified schematic view of a robot capable of implementing the method of the invention.
- a chopping mechanism is proposed at the level of the extrusion nozzle of the polyarticulated robot in order to obtain a discontinuous deposition of the foam on the support.
- the foam is deposited discontinuously, by alternating periods of deposition and periods of absence of deposition of expanded foam on the support, the durations of the periods of deposition and periods of absence of deposition being however controlled to obtain a continuous bead of predefined constant section on the support.
- This discontinuous foam deposition process is achieved by appropriately controlling the robot's foam extrusion nozzle.
- Figure 1 schematically illustrates the control law of the robot extrusion nozzle.
- the extrusion nozzle alternates opening periods PI of duration T1, during which the extrusion nozzle is open and delivers material, and closing periods P2 of duration T2, during which the extrusion nozzle is closed. and does not deliver matter.
- the opening and closing periods of the extrusion nozzle which correspond respectively to the periods of deposit and absence of deposit of expanded foam, are preferably of durations very short, less than 15 milliseconds (Tl ⁇ 15ms and T2 ⁇ 15ms) so as to obtain a continuous bead of foam.
- This very fine chopping also allows very precise management and control of foaming and foam expansion.
- the periods of deposit and absence of deposit also have a minimum duration imposed by the performance of the extrusion nozzle used to deposit the foam. Indeed, depending on the control technology used for the extrusion nozzle, there is a duration, denoted T mini , below which an opening and closing command of the extrusion nozzle has no significant effect ( uninterrupted removal or absence of removal). This duration can be compared to the reaction time of the extrusion nozzle. According to the invention, Tl and T2 are therefore defined so that Tl> T mini and T2> T mini .
- T min2 There is also a duration, denoted T min2 , below which the command to open the extrusion nozzle does not allow the flow of foam to be established.
- This duration T min2 is greater than the duration T min .
- the duration Tl is greater than 9 T mln2 .
- this discontinuous process of depositing expanded foam is implemented when the speed of movement of the robot is reduced, in particular when the robot follows a curved trajectory.
- the volume of foam to be deposited is generally lower than in a straight line. This reduction in the amount of foam to be deposited is then taken into account by adding a correction coefficient C in the previous formula. We then have - c ⁇ re
- the robotic system switches from a continuous cord deposition mode to a discontinuous mode when the cord deposition speed drops significantly, for example when it drops by at least 10%.
- V re d can be between 0.5V and 0.9V.
- the durations T1 of the deposit periods and the durations T2 of the periods of absence of deposit satisfy the relation:
- the extrusion nozzle 11 moves, by means of the articulated arm, along a predefined trajectory comprising rectilinear portions and curved portions.
- the extrusion nozzle 11 is controlled to operate in continuous or discontinuous mode.
- continuous mode the extrusion nozzle remains in the open position and deposits the material (mixture) on the support. This is for example the case on the rectilinear portions of the trajectory.
- discontinuous mode the extrusion nozzle alternates between open position and closed position. This discontinuous mode is more particularly adapted to the curved portions of the trajectory where the speed of movement of the robot is reduced.
- This new mode of removal makes it possible to obtain a bead of material of substantially constant section for low speeds of movement of the articulated arm without having to modify other robot control parameters.
- the embodiment described above is provided by way of example.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Physics & Mathematics (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Optics & Photonics (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Tyre Moulding (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1859971A FR3087806B1 (fr) | 2018-10-26 | 2018-10-26 | Procede de depose d’un cordon de mousse expansee avec un robot et robot associe |
| PCT/FR2019/052523 WO2020084253A1 (fr) | 2018-10-26 | 2019-10-23 | Procede de depose d'un cordon de mousse expansee avec un robot et robot associe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3870766A1 true EP3870766A1 (fr) | 2021-09-01 |
Family
ID=65444129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19813095.7A Withdrawn EP3870766A1 (fr) | 2018-10-26 | 2019-10-23 | Procede de depose d'un cordon de mousse expansee avec un robot et robot associe |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3870766A1 (fr) |
| FR (1) | FR3087806B1 (fr) |
| WO (1) | WO2020084253A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020130955B4 (de) * | 2020-11-23 | 2023-09-28 | Hans Weber Maschinenfabrik Gmbh | Vorrichtung und Verfahren zur extrusionsbasierten Herstellung eines geschäumten dreidimensionalen Objekts |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7874825B2 (en) * | 2005-10-26 | 2011-01-25 | University Of Southern California | Nozzle for forming an extruded wall with rib-like interior |
| JP2007518586A (ja) * | 2004-01-20 | 2007-07-12 | ユニバーシティ オブ サウザーン カリフォルニア | ロボットシステムを含む自動建設 |
| FR3050744B1 (fr) | 2016-05-02 | 2020-08-14 | Univ Nantes | Procede pour la construction d'un mur de batiment par fabrication additive |
-
2018
- 2018-10-26 FR FR1859971A patent/FR3087806B1/fr active Active
-
2019
- 2019-10-23 EP EP19813095.7A patent/EP3870766A1/fr not_active Withdrawn
- 2019-10-23 WO PCT/FR2019/052523 patent/WO2020084253A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| FR3087806B1 (fr) | 2021-01-08 |
| FR3087806A1 (fr) | 2020-05-01 |
| WO2020084253A1 (fr) | 2020-04-30 |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: PAQUET, ELODIE Inventor name: GARNIER, SEBASTIEN Inventor name: FURET, BENOIT |
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| DAX | Request for extension of the european patent (deleted) | ||
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE Owner name: UNIVERSITE DE NANTES |
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Owner name: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE Owner name: NANTES UNIVERSITE |
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