| 摘要 |
A substantial portion of the peripheral edges of two panels forming a component of a motor-vehicle body, in particular a front bonnet of a motor-vehicle, is joined by interposing a thermosetting adhesive. Polymerization of the adhesive is obtained by heating, without introducing the structure into an oven, by means of one or more induction heating coil, which are shaped and arranged in proximity and along the peripheral edges of the two panels. The quality of the induction heating process is controlled according to signals output by a thermographic detection camera which is positioned adjustable at a point from which it can acquire a thermographic image of the entire extension of said peripheral edges of the panels to be joined, so as to allow simultaneously controlling the temperature reached by each portion of the peripheral edges of the panels. |
| 主权项 |
1. Method for joining, by use of an adhesive, at least a substantial portion of the peripheral edges of two panels forming a front bonnet of a motor-vehicle body, said method comprising:
a step of interposing a thermosetting adhesive between the peripheral edges of the two panels forming the front bonnet, and a step of heating said panels along said peripheral edges to obtain the polymerisation of the adhesive, wherein said heating is carried out, without introducing the panels into an oven, by use of one or more magnetic induction coils which are shaped and arranged in proximity of and along said peripheral edges, wherein a single thermographic detection camera is provided at an adjustable position from which the camera can acquire a thermographic image of the entire extension of said peripheral edges of the panels to be joined, in such a manner to simultaneously control the temperature attained by each portion of said peripheral edges during the induction heating step, wherein the heating step provides for a first part with increasing temperature followed by a second part with constant temperature and in that the heating is interrupted upon ascertaining, by use of said camera, attainment of quality parameters set along the entire extension of the peripheral edges along which the adhesive to be polymerized is prearranged, and wherein said method further comprises: providing a base structure on which said two panels are supported horizontally, and providing a support structure for said single thermographic detection camera, which holds said single thermographic detection camera in a raised position above said panels, said position being spaced apart vertically from said panels by a distance which is several times the axial dimension of said single thermographic detection camera, wherein the single thermographic camera is placed at a particular distance during heating of the adhesive, wherein the single thermographic camera is used to generate a single image which, at any instant, contains all portions of the peripheral edges of the panels to be monitored so that all portions of the peripheral edges of the panels can be monitored simultaneously, wherein the method is stopped when the single image shows that all monitored peripheral edges of the panels have reached a set of required characteristics, and wherein the single thermographic camera is not moved during the method in order to focus on all of the monitored peripheral edges of the panels. |
