Abstract: The present disclosure relates to a method for checking the integrity of a glue joint which is to be checked and which connects one portion of a body box and a body skin, which define an inner volume therebetween. The method includes: arranging at least one ultrasound sensing device in the inner volume; emitting a pressurized directional air jet opposite a predetermined area of the glue joint; recording a noise level detected by the ultrasound sensing device in the inner volume; and determining an integrity defect in the glue joint according to the recorded noise level.

Abstract: The invention particularly relates to a method of applying a permanent coating to a plastic surface of a first part, comprising the following steps: applying to said plastic surface a layer of a polyamide-based hot-melt material, maintaining this layer of hot-melt material on said plastic surface for a period of time ranging from a few minutes to several hours, removing this layer of hot-melt material from this plastic surface; and applying a permanent coating to said surface, said permanent coating being based on polyurethane, an epoxy resin or polyesters, a polycarbonate and/or an acrylic resin; as well as the use of such a method in the automotive industry.

Abstract: The invention particularly relates to a method of applying a permanent coating to a plastic surface of a first part, comprising the following steps: applying to said plastic surface a layer of a polyamide-based hot-melt material, maintaining this layer of hot-melt material on said plastic surface for a period of time ranging from a few minutes to several hours, removing this layer of hot-melt material from this plastic surface; and applying a permanent coating to said surface, said permanent coating being based on polyurethane, an epoxy resin or polyesters, a polycarbonate and/or an acrylic resin; as well as the use of such a method in the automotive industry.

Abstract: Method for adhering a first part made of plastic material (MP) and a second part, in which at least one thickness of adhesive is deposited onto at least one of said parts, and the other part is placed against the thickness of adhesive, wherein: at least one electromagnetic wave of a given wavelength is selected, such that the transmission of said plastic material (MP) in relation to this wave is not zero, and such that the absorbance of the adhesive in relation to this wave is not zero; and at least some of the adhesive is heated by irradiating it by transmitting said electromagnetic wave through said plastic material (MP) to activate and/or accelerate cross-linking of the adhesive.

Abstract: The invention relates to a punching and/or welding machine for acting on a piece of motor vehicle bodywork that is made of plastics material, the machine having movable punching and/or welding tools, each of which is adjusted to perform a punching and/or welding operation and that are transferred from a waiting position to a working position for performing the punching and/or welding operation, the punching and/or welding operation being performed in three stages: a) transferring from a waiting position at a distance from a skin of the piece in order to come into a working position in contact with the skin; b) performing the punching and/or the welding; and then c) returning to the waiting position; the device further comprising a support for receiving the skin in a determined position.

Abstract: The invention relates to a punching and/or welding machine for acting on a piece of motor vehicle bodywork that is made of plastics material, the machine having movable punching and/or welding tools, each of which is adjusted to perform a punching and/or welding operation and that are transferred from a waiting position to a working position for performing the punching and/or welding operation, the punching and/or welding operation being performed in three stages: a) transferring from a waiting position at a distance from a skin of the piece in order to come into a working position in contact with the skin; b) performing the punching and/or the welding; and then c) returning to the waiting position; the device further comprising a support for receiving the skin in a determined position.

Abstract: A method of manufacturing a painted part of plastic material for the automobile industry having an opening, including the steps of molding the part and then, in the following order: painting the part; after painting, punching the part without edge-rounding using a punch to obtain the orifice; and after punching and extracting the punch from the orifice, rounding the edge of the opening of the orifice to have a predetermined radius of curvature in a radial section across the edge.

Abstract: This assembly of a trim part of thermoplastic material for a motor vehicle with another part having a thin portion of thermoplastic material is such that the thin portion presents through orifices and the melting of the trim part together with the thin portion is localized solely at the outlines of the through orifices. In the assembly method, the melting of material is obtained by welding, by means of tangential vibrations of a bit in an ultrasound frequency range. The tangential vibrations are applied to the thin portion of the other part so as to form at least one through orifice in said part and so as to cause melting of said part together with the trim part at the outline of the orifice.

Abstract: The invention relates to a motor vehicle door member (10) comprising an appearance part constituted by an outside skin (12) of polyolefin, and a structural part (14) having a coefficient of expansion that is less than that of the skin, the two parts being united by a bead of adhesive placed on a face of one of the two parts facing a face of the other part. The adhesive presents: breaking elongation lying in the range 20% to 800%; purely elastic elongation over a fraction of its breaking elongation; and Young's modulus lying in the range 0.5 MPa to 300 MPa. After bonding, the bead of adhesive presents a nominal thickness lying in the range 0.8 mm to 3 mm.

Abstract: A method of manufacturing a painted part (3) of plastics material for the automobile industry, the part including an orifice (4) having an opening (5) with a rounded edge, the method consisting in molding the part, and then in subjecting it to the operations of punching, edge-rounding and painting a predetermined order, the method being characterized in that the predetermined order is as follows: a) painting; b) punching without edge-rounding using a punch (1) to obtain the orifice (4); and c) rounding the edge of the opening (5) of the orifice (4) after extracting the punch (1) from the orifice (4). A painted part made of plastics material for the automobile industry, including an orifice (4) having an opening (5) with its edge rounded to a radius of at least 0.9 mm.

Abstract: This assembly of a trim part of thermoplastic material for a motor vehicle with another part having a thin portion of thermoplastic material is such that the thin portion presents through orifices and the melting of the trim part together with the thin portion is localized solely at the outlines of the through orifices. In the assembly method, the melting of material is obtained by welding, by means of tangential vibrations of a bit in an ultrasound frequency range. The tangential vibrations are applied to the thin portion of the other part so as to form at least one through orifice in said part and so as to cause melting of said part together with the trim part at the outline of the orifice.