Classifications

• • 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
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/28—Shaping operations therefor
  • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
  • B29C70/542—Placing or positioning the reinforcement in a covering or packaging element before or during moulding, e.g. drawing in a sleeve
• • 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
  • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
  • B29C53/02—Bending or folding
  • B29C53/12—Bending or folding helically, e.g. for making springs
• • 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
  • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
  • B29C53/80—Component parts, details or accessories; Auxiliary operations
  • B29C53/82—Cores or mandrels
• • 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
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/06—Fibrous reinforcements only
  • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
  • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
• • 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
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/28—Shaping operations therefor
  • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F1/00—Springs
  • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
  • F16F1/366—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers made of fibre-reinforced plastics, i.e. characterised by their special construction from such materials
• • 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
  • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
  • B29C53/80—Component parts, details or accessories; Auxiliary operations
  • B29C53/84—Heating or cooling
• • 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
  • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
  • B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
  • B29L2031/3055—Cars
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/774—Springs
  • B29L2031/7742—Springs helical springs
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F1/00—Springs
  • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
  • F16F1/366—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers made of fibre-reinforced plastics, i.e. characterised by their special construction from such materials
  • F16F1/3665—Wound springs
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F2226/00—Manufacturing; Treatments

Definitions

• the present disclosure relates to a method of manufacturing a composite body having a given shape.
• the present disclosure relates to a method of manufacturing a composite body, in particular an element for vehicle suspension, the composite body having a given shape, the method comprising the following steps:
• the installation step comprises braiding or knitting ribbons comprising said elastic sheathing material around the rope.
• the fact of unwinding the sheath in the direction of the length of the rope comprises passing the sheath through a removal device, the removal device comprising a fixed ring and an assembly of balls mounted for rotation, the sheath passing between the fixed ring and the balls.
• the rope is kept fixed and tensioned while the removal device is mobile, traveling along the rope to unwind the sheath in the direction of the length of the rope.
• said end of the sheath is provided with a clamping element, and the clamping element is held tight while the sheath is unwound in the direction of the length of the rope.
• the pressurized fluid can be sprayed at room temperature, a temperature below room temperature or even at a temperature above room temperature but nevertheless below the curing temperature of the resin. the rope.
• the fact of unwinding the sheath in the direction of the length of the rope further comprises passing the sheath through at least one set of rollers, the rollers exerting mechanical pressure on the first side of the sheath.
• a combined fitting and blowing device comprising a nozzle, which is capable of receiving said end of the rope and said end sheath, and a gas blowing element secured to the nozzle;
• the method further comprises applying a non-stick between the sheath and the rope while the sheath is being fitted on the rope.
• a non-stick makes it possible, if necessary, to easily remove the sheath once the final composite body has been obtained, for example in order to allow the composite material to appear.
• the sheath has a first end and a second end, and the installation step comprises the steps of:
• said voltage is applied to the two ends of the sheath.
• the core is made of a material capable of liquefying during the cooking step, in particular an eutectic material, more particularly an eutectic material chosen from the group consisting of the following mixtures: tin- bismuth, lead-tin-bismuth.
• the composite body may more particularly be a coil spring for vehicle suspension.
• FIG 2B is a sectional view of FIG 2A according to IIB-IIB.
• FIG 2D is a view similar to FIG 2A schematically explaining how the elastic sheathing material of the sheath is maintained in a stretched state.
• FIG 2E is a view similar to FIG 2D explaining schematically how the elastic sheathing material of the sheath is maintained in a stretched state after the shaping step.
• FIG 3 shows the assembly of FIG 2A installed on a core during its shaping.
• FIG 6C is a sectional view of FIG 6B according to VIC-VIC.
• FIGS 12A and 12B are sectional views illustrating the fourth way of fitting the sheath onto the rope using the combined fitting and blowing device shown in FIG 11.
• FIG 13 is a schematic view illustrating a suction tube usable in a fifth way of fitting the sheath on the rope.
• FIG 1 is a block diagram representing the steps of a manufacturing method 1 of a composite body 60.
• the method 1 comprises a supply step 2, an installation step 3, a setting step form 4, and a cooking step 5 which are described below in more detail.
• the rope 51 can be produced by braiding and / or winding prepreg ribbons. The methods for carrying out such braiding and / or winding are well known per se and are therefore not described in detail here.
• the rope 51 can be produced by in-line impregnation, that is to say that the organic resin or matrix is provided during the braiding and / or winding of the fibrous ribbons of the rope 51.
• the installation step 3 comprises the fact of applying a thermosetting resin on the cord 51 and the fact of hardening said thermosetting resin so as to obtain the sheath 52.
• the thermosetting resin can be applied, for example, by electrostatic projection or by co-extrusion.
• the thermosetting resin is an epoxy-based resin.
• the sheath 52 is obtained by deposition and vulcanization in situ of a rubber on the rope 51.
• the installation step 3 comprises the fact of applying a rubber to the rope 51 and vulcanizing said rubber so as to obtain the sheath 52.
• the rubber can be chosen from natural rubbers, and synthetic rubbers, such as for example EPDM rubbers (“ethylene propylene diene monomer rubber” in English, also known under the name ethylene-propylene-diene monomer), NBR rubbers (“Nitrile Butadiene Rubber” in English, also known as “nitrile rubbers”), IIR rubbers (“Isobutylene Isoprene Rubber” in English, also known as “butyl rubbers”).
• the sheath 52 is formed by one or more elements which are installed on the rope 51 like this will be detailed later.
• the elastic sheathing material can then be chosen from the group consisting of:
• the sheath 52 is obtained by braiding or knitting several ribbons comprising the elastic sheathing material.
• installation step 3 includes braiding or knit the ribbons around the rope 51, so as to obtain the sheath 52.
• the supply step 2, the installation step 3 and the shaping step 4 are carried out continuously.
• the rope 51 is supplied or produced continuously
• the sheath 52 is installed continuously on the rope 51 thus supplied or produced
• the assembly 40 thus obtained continuously is shaped continuously, for example around a core as described above.
• the cooking step 5 is then preceded by a step (not shown) of cutting the assembly 40 continuously shaped (and possibly of the core that served to shape it), so as to obtain an assembly 40 of adequate dimensions.
• the method 1 further comprises a cooking step 5 of the assembly 40.
• this cooking step 5 consists in bringing the assembly 40 to a sufficient temperature and for a time sufficient to harden the resin. the cord 51.
• said temperature is also low enough not to damage (for example by pyrolysis) the resin of the cord 51 or the material of the sheath 52.
• the composite body 60 is obtained. As shown in FIGS 4A and 4B, the composite body 60 comprises a central composite structural part 61 resulting from the cooking of the rope 51 This central part 61 is surrounded by the sheath 52.
• the sheath 52 is still in place on the composite of the central part 61.
• the assembly 40 may be subjected to the cooking step 5 together with the core 90, it that is to say that the assembly 40 is not removed from the core 90 before the cooking step 5.
• the core 90 is made of a material capable of liquefying during the cooking step 5.
• capable of liquefying is meant to include both the materials which become liquid by melting under the effect of the temperature applied during the cooking step 5 as well as the materials which become pasty. Thus, it is not necessary to mechanically remove the assembly 40 from the core 90, since the core 90 simply liquefies during the cooking step 5.
• the core 90 is made of a eutectic material. Such materials in fact have relatively low melting temperatures, which results in liquefaction imposing a relatively moderate increase in energy expenditure in the cooking step 5. It is even more particularly advantageous for the eutectic material to be chosen from the group consisting of the following mixtures: tin-bismuth, lead-tin-bismuth. It is advantageous that the method 1 also comprises a preheating step (not shown) in which the sheath 52 is heated to a preheating temperature typically strictly lower than the cooking temperature used during the cooking step 5. This preheating step is typically carried out between the installation step 3 and the shaping step 4.
• the elastic sheathing material it is advantageous for the elastic sheathing material to be heat-shrinkable.
• heat shrinkable it is meant that the elastic sheathing material tends to decrease in size under the effect of a rise in temperature. More concretely and by way of nonlimiting example, if the elastic sheathing material is shaped in the form of a tube, this tube may tend to decrease in diameter under the effect of a rise in temperature. This temperature rise can be obtained by the preheating step which has just been described, the preheating temperature being sufficient to obtain the reduction dimension of the elastic sheathing material while remaining below the baking temperature used during the cooking step 5.
• the sheath 52 tends to compress the cord 51 even more during the cooking step 5. It follows that during and after the step cooking 5, the network of fibers and / or the crosslinked matrix of the central part 61 are less porous and denser. This further improves the mechanical properties of the composite body 60.
• the elastic sheathing material of the sheath 52 is maintained in a stretched state at least during the cooking step 5.
• stretched state means here a state of the elastic sheathing material which is obtained by stretching the elastic sheathing material from its state at rest.
• maintained in a stretched state is meant that the elastic sheathing material is kept in the stretched state, rather than returning to its resting state due to its elastic properties.
• the sheath 52 tends to compress the cord 51 even more, with the same results as mentioned above. It is understood that this result is obtained when the elastic sheathing material is non-auxetic, that is to say when it has a strictly positive Poisson's ratio, so that it contracts effectively when a voltage is applied to the minus one of its ends.
• the sheath 52 has an opening 53 extending along its length.
• the sheath 52 can thus have a cross section substantially in the shape of a "U", as shown in FIG 5B.
• the presence of such an opening 53 can make it easier to fit the sheath 52 onto the rope 51.
• the sheath 52 can more easily be fitted manually onto the rope 51.
• the unwinding of the sheath 52 in the direction of the length 51 may further include passing the sheath 52 through a removal device 200.
• This removal device 200 is shown in FIGS 6B and 6C.
• the device 400 may further comprise a gas supply tube 440 allowing the pressurized gas to be brought to the blowing element 420.
• a handling tube 430 can extend inside the gas supply tube 440, one end 430A of the tube 430 extending outside the tube 440, and the other end 430B being integral with the end piece 410.
• the manipulation of the tube 430 makes it possible to position the end piece 410.
• a gas 460 is blown under pressure on the second face 52-2 of the sheath 52.
• the gas under pressure 460 spreads inside the sheath 52 as shown diagrammatically by arrows 461 and 462 in FIG 12B, and exerts pressure on the second face 52-2. This pressure tends to unwind the sheath 52 so as to bring the first face 52-1 into contact with the cord 51.
• the pressurized gas 460 passes through the gas supply tube and through the gas blowing element 420.
• an adhesive 96 or a non-stick can also be applied, for example using spray guns 95 provided at the end 52B of the sheath 52.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Composite Materials (AREA)
• General Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Ropes Or Cables (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=65244265

Family Applications (2)

Family Applications Before (1)

Country Status (3)

Family Cites Families (9)

• 2018
  • 2018-10-12 FR FR1859476A patent/FR3087148A1/fr not_active Withdrawn
• 2019
  • 2019-10-11 WO PCT/FR2019/052425 patent/WO2020074846A1/fr not_active Ceased
  • 2019-10-11 EP EP19813622.8A patent/EP3863841A1/de not_active Withdrawn
  • 2019-10-11 WO PCT/FR2019/052424 patent/WO2020074845A1/fr not_active Ceased
  • 2019-10-11 EP EP19813621.0A patent/EP3863840A1/de not_active Withdrawn

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