Production process of automobile body and non-standard baking device

Abstract

The invention discloses a production process of an automobile body and a non-standard baking device, the production process comprises a welding procedure and a coating procedure which are operated in sequence, and the welding procedure comprises a press-fit edge gluing procedure and a press-fit edge press-fit procedure which are operated in sequence. The coating procedure comprises an electrophoretic painting procedure, an electrophoretic paint drying procedure, a polishing procedure, a PVC (polyvinyl chloride) gluing procedure, a four-door two-cover adhesive tape baking procedure, a finish paint spraying procedure, an integral drying procedure and a modification procedure which are operated in sequence; glue is sprayed on the face A, the face B and the face C of the press-fit edges of the four doors and the two covers; a press-fit edge press-fit procedure: press-fit edges of the four doors and the two covers are pressed to 0.01-0.25 mm; a four-door and two-cover adhesive tape baking procedure: only baking the PVC adhesive tape at the press-fit edges of the four-door and two-cover of the electrophoresis vehicle body; and an integral drying procedure, wherein the electrophoresis vehicle body is conveyed to a second drying furnace to be completely dried. The production process has the advantages of low energy consumption, low cost and high product quality.

Description

Technical Field

[0001] The present application relates to the technical field of automobile production, and in particular to a production process for automobile bodies and a non-standard baking device. Background Art

[0002] Automobile production mainly includes four major processes, namely stamping → welding → painting → final assembly. For the painting process, most automobile manufacturers use traditional painting technology. The steps of the traditional painting process are electrophoresis process → electrophoresis body drying furnace → PVC gluing → PVC drying furnace → polishing process → topcoat spraying → topcoat drying furnace → finishing process. In the actual production process, it is found that after spraying PVC glue, entering the PVC drying furnace for drying can only play the role of surface drying, but the PVC drying furnace requires a large amount of energy during use, resulting in energy waste and high production costs. In the actual production process, attempts were made to reduce the baking temperature of the PVC drying furnace to save energy, but on the one hand, PVC glue dripping will occur, affecting the gluing effect of PVC glue, and on the other hand, the effect of saving energy by only reducing the baking temperature of the PVC drying furnace is not obvious.

[0003] The prior art has begun to explore the painting process of eliminating the PVC drying furnace. However, it is difficult to ensure that there is no cavity in the pressed edges of the four doors and two covers when the glue is sprayed and pressed in the welding process. As a result, when the topcoat is dried in a drying furnace after PVC glue coating and topcoat spraying in the painting process, the gas in the cavity is released outward, resulting in a large number of bubbles at the pressed edges of the four doors and two covers. Some of the bubbles are cracked, and the cracked bubbles will cause the topcoat to crack, thereby affecting the production quality of the automobile. Summary of the invention

[0004] To solve at least one aspect of the above problems, the present invention provides a production process for automobile bodies, comprising a welding process and a painting process which are operated in sequence, the welding process comprising a pressing edge gluing process and a pressing edge pressing process which are operated in sequence, the painting process comprising an electrophoretic painting process, an electrophoretic paint drying process, a grinding process, a PVC gluing process, a four-door and two-cover rubber strip baking process, a topcoat spraying process, an overall drying process and a finishing process which are operated in sequence; the pressing edge gluing process: spraying adhesive on the A surface, the B surface and the C surface at the pressing edge of the four doors and two covers; the pressing edge pressing process: pressing the pressing edge of the four doors and two covers, and the pressing thickness of the pressing edge is 0.01 to 0.25 mm; the electrophoretic painting process Process: the electrophoretic car body to be painted is painted using the electrophoretic process; electrophoretic paint drying process: the electrophoretic car body is transported to the first drying furnace for complete drying; polishing process: the electrophoretic car body after electrophoresis is polished; PVC gluing process: PVC glue is sprayed on the bottom plate of the electrophoretic car body and the welds between the cockpit and the front cabin; four-door and two-cover rubber strip baking process: only the PVC rubber strips at the pressed edges on the four doors and two covers of the electrophoretic car body are baked; topcoat spraying process: color paint and varnish are sprayed on the inner and outer surfaces of the electrophoretic car body in turn; overall drying process: the electrophoretic car body is transported to the second drying furnace for complete drying; finishing process: dirty spots and defects are polished and processed on the painted car body after spraying the topcoat.

[0005] Through the above technical scheme, in the process of gluing the pressed edge, the A side, B side and C side of the pressed edge are all sprayed with adhesive, which, on the one hand, helps to increase the bonding strength of the inner side of the pressed edge and reduce the possibility of cracking of the pressed edge, and on the other hand, increases the volume of the adhesive filling in the pressed edge, thereby reducing the volume of the cavity in the pressed edge, that is, reducing the amount of air in the pressed edge, thereby reducing the generation of PVC bubbles in the subsequent production process; in the pressing process, reducing the pressing thickness of the pressed edge helps to further reduce the volume of the cavity in the pressed edge, thereby further reducing the generation of PVC bubbles in the subsequent production process; by eliminating the traditional coating process, the pressure drop of the pressed edge is reduced, and the pressure drop of the pressed edge is reduced, thereby reducing the pressure drop of the pressed edge. In the process, the PVC is dried in a PVC drying furnace after PVC glue coating, and a baking process of the four-door and two-cover rubber strips is added. Only the four doors and two covers of the automobile body are baked. On the one hand, it helps to significantly reduce energy consumption, thereby saving energy and reducing costs. On the other hand, after PVC glue coating, baking the rubber strips of the four doors and two covers helps to release bubbles in the rubber strips at the pressed edges and the initial hardening of the rubber strips, which helps to further reduce the generation of PVC bubbles in the subsequent drying process, and increase the hardness of the rubber strips to improve the resistance to torque generated by the PVC rubber strips when the varnish is cured in the subsequent drying process, thereby reducing the risk of cracking of the topcoat and improving production quality. Therefore, the production process of the present application has the advantages of low energy consumption, low cost and high product quality.

[0006] Preferably, in the four-door and two-cover rubber strip baking process, the baking temperature of the PVC rubber strip is 100-140° C., and the baking time is 30-45 seconds.

[0007] Preferably, the glue filling rates of the B side and the C side of the pressed edge are both 110% to 160%.

[0008] Preferably, the performance requirements of the PVC glue are as follows: the tensile strength ranges from 1.5 to 2.9 MPa, the elongation at break ranges from 190% to 220%, the Shore hardness ranges from 55 to 65A, and the viscosity ranges from 7000 to 8500 Pa·s. By means of the above technical solution, the performance of the PVC glue is improved, which helps to further improve the resistance of the PVC strip to the torque generated by the varnish during the overall drying process, thereby further reducing the risk of cracking of the topcoat.

[0009] Preferably, when spraying clear varnish in the topcoat spraying process, the varnish spraying film thickness of the electrophoretic car body where the PVC glue has been sprayed is in the range of 35um to 40um. Since the clear varnish is solidified first and the PVC glue is solidified later in the overall drying process, the PVC glue will tear against the solidified clear varnish during its expansion, thereby causing the bubbles in the PVC glue to crack. Through the above technical solution, the spraying film thickness of the clear varnish is reduced, which helps to reduce the torque of the solidified clear varnish on the PVC glue, thereby reducing the risk of PVC glue bubble cracking, so that the risk of topcoat cracking is further reduced.

[0010] Preferably, the drying of the second drying furnace includes at least three stages; the baking temperature of the first heating stage is 105-115°C, and the heating time is 5-10 minutes; the baking temperature of the second heating stage is 150-165°C, and the heating time is 5-10 minutes; the baking temperature of the insulation stage is 150-165°C, and the insulation time is 20-30 minutes. Since in the overall drying process, the wet film of the PVC strip enters the drying furnace for baking together with the subsequently sprayed paint and varnish, the varnish has a low curing temperature and a fast curing speed, and the PVC glue is cured under the paint and varnish and has a slow curing speed. Through the above technical solution, the baking temperature of the first heating stage is reduced, and within the same time, the curing degree of the varnish is reduced, and the hardness will not be too high. In this way, when the bubbles of the PVC strip expand, the paint and varnish are relatively soft and will not be easily damaged.

[0011] The present application also provides a non-standard baking device, which is applied to the baking process of the four-door and two-cover rubber strips in any of the above-mentioned automobile body production processes, including a working cabin, a position sensor, two sets of door baking units, a front cover baking unit, a rear cover baking unit and a control unit; the working cabin includes an electrophoretic body driving area, and the electrophoretic body driving area is used for the electrophoretic body transportation system to transport the electrophoretic body; a baking area is set in the electrophoretic body driving area; the position sensor is installed near the baking area to detect the position of the electrophoretic body; the two sets of door baking units are respectively arranged on the two sides of the baking area The first support frame is used to bake the rubber strips of the four doors on both sides of the electrophoretic vehicle body; the door baking unit includes a first support frame and a plurality of first baking lamps, and the plurality of first baking lamps are distributed along the pattern formed by the rubber strips of the front door opening side, the rear door opening side and the rubber strips at the lower edge of the door of the electrophoretic vehicle body, and the plurality of first baking lamps are fixedly connected to the first support frame; the front cover baking unit is arranged at the first end of the baking area, and is used to bake the rubber strips of the front cover of the electrophoretic vehicle body; the front cover baking unit includes a first linear guide rail, a second support frame and a plurality of second baking lamps; the guide rail of the first linear guide rail is fixed along a direction perpendicular to the driving direction of the electrophoretic vehicle body The second support frame is fixedly connected to the slider of the first linear guide rail; a plurality of second baking lamps are distributed in a pattern formed by the rubber strip of the front cover of the electrophoretic vehicle body, and the plurality of second baking lamps are fixedly connected to the second support frame; the rear cover baking unit is arranged at the second end of the baking area, and is used to bake the rubber strip of the rear cover of the electrophoretic vehicle body; the rear cover baking unit includes a second linear guide rail, a third support frame and a plurality of third baking lamps; the guide rail of the second linear guide rail is fixedly arranged on the upper part of the working cabin along the direction perpendicular to the travel direction of the electrophoretic vehicle body; the third support frame is fixedly connected to the slider of the second linear guide rail ; Several third heating lamps are distributed along the pattern formed by the rubber strips of the rear cover of the two-box electrophoretic vehicle body or the pattern formed by the rubber strips of the rear cover of the three-box electrophoretic vehicle body, and the several third heating lamps are fixedly connected to the third support frame; the control unit is communicatively connected with the position sensor, several first heating lamps, the first linear guide, several second heating lamps, the second linear guide, and several third heating lamps, and is used to receive signals from the position sensor, and control the opening and closing of the several first heating lamps, the several second heating lamps and the several third heating lamps, as well as the operation of the first linear guide and the second linear guide according to the signals from the position sensor.

[0012] The four-door and two-cover rubber strip baking process can be baked manually with a hand-held baking lamp, but it will increase the workload and production time of the staff, and the baking quality will vary depending on the staff. Through the above technical solution, an online baking device for the four-door and two-cover rubber strips is designed. After the electrophoretic car body is sprayed with PVC glue, the electrophoretic car body is transported to the station of the four-door and two-cover rubber strip baking process through a transportation system such as a skid. After the position sensor detects that it has arrived at the baking area, it transmits a signal to the control unit. The control unit controls the first linear guide and the second linear guide to respectively move the front cover baking unit and the rear cover baking unit to the baking area. The cover baking unit moves to correspond to the front cover rubber strips and the rear cover rubber strips of the electrophoretic vehicle body respectively, and controls a plurality of first baking lamps, a plurality of second baking lamps and a plurality of third baking lamps to turn on to bake the rubber strips of the four doors and two covers; when the baking is completed, controls a plurality of first baking lamps, a plurality of second baking lamps and a plurality of third baking lamps to turn off, and controls the first linear guide rail and the second linear guide rail to respectively move the front cover baking unit and the rear cover baking unit back to their original positions, so as to realize the automation of the baking of the four doors and two covers, which helps to reduce the workload of the staff, shorten the processing time of the baking process of the four doors and two covers, and improve the baking quality of the rubber strips of the four doors and two covers.

[0013] Preferably, the rear cover baking unit also includes a fourth support frame and a plurality of fourth baking lamps; the second linear guide is a double-slider linear guide, the third support frame is fixedly connected to one of the sliders, and the fourth support frame is fixedly connected to the other slider; a plurality of third baking lamps are distributed along a pattern formed by the rubber strips of the rear cover of the two-compartment electrophoretic vehicle body, and a plurality of fourth baking lamps are distributed along a pattern formed by the rubber strips of the rear cover of the three-compartment electrophoretic vehicle body, and a plurality of fourth baking lamps are fixedly connected to the fourth support frame. Through the above technical scheme, the baking device of the present application can be used to bake the rubber strips of the four doors and two covers of the electrophoretic vehicle body of a two-compartment car and a three-compartment car, which expands the scope of use of the baking device of the present application.

[0014] Preferably, it also includes an identification unit for identifying the type of the electrophoretic vehicle body; the identification unit is in communication connection with the control unit, and the control unit is used to control the operation of the two sliders on the second linear guide rail according to the type of vehicle identified by the identification unit. Through the above technical solution, when the position sensor detects that the electrophoretic vehicle body enters the baking area, the identification unit identifies the type of the electrophoretic vehicle body and transmits the result to the control unit. When the identified vehicle type is a two-compartment type, the control unit controls the operation of the slider on the second linear guide rail connected to the third support frame. When the identified vehicle type is a three-compartment type, the control unit controls the operation of the slider on the second linear guide rail connected to the fourth support frame, which helps to improve the degree of automation of the present application.

[0015] Preferably, the door baking unit further includes a fixing frame, a third linear guide rail and a fourth linear guide rail; the fixing frames of the two sets of door baking units are respectively fixedly arranged on both sides of the middle of the baking area along the driving direction of the electrophoretic vehicle body; the guide rail of the third linear guide rail is fixedly arranged on the fixing frame along the vertical direction or the horizontal direction; the guide rail of the fourth linear guide rail is perpendicular to the guide rail of the third linear guide rail, and the first support frame is fixedly connected to the slider of the fourth linear guide rail; the third linear guide rail and the fourth linear guide rail are both connected to the control unit for communication, and the control unit controls the operation of the third linear guide rail and the fourth linear guide rail. Through the above technical solution, the position of the first support frame is moved by the third linear guide rail and the fourth linear guide rail to adapt to the door position of different vehicle models.

[0016] Preferably, the first support frame, the second support frame, the third support frame and the fourth support frame are respectively provided with a first temperature sensor, a second temperature sensor, a third temperature sensor and a fourth temperature sensor, which are used to measure the temperature of the door rubber strip, the front cover rubber strip and the rear cover rubber strip respectively; the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are all connected to the control unit for communication, and the control unit controls the operating power of the first heating lamps or the second heating lamps or the third heating lamps or the fourth heating lamps according to the measurement results of the first temperature sensor or the second temperature sensor or the third temperature sensor or the fourth temperature sensor. Through the above technical solution, the temperature sensors are set to measure the temperature of the door rubber strip, the front cover rubber strip and the rear cover rubber strip respectively, and when the temperature does not reach the preset baking temperature, the control unit controls the operating power of the first heating lamps, the second heating lamps and the third heating lamps to increase to increase the baking temperature; when the temperature reaches the preset baking temperature, the control unit controls the operating power of the first heating lamps, the second heating lamps and the third heating lamps to remain unchanged to maintain the baking temperature, which helps to control the baking temperature of the rubber strip within the preset range and improve the baking quality of the rubber strips of the four doors and two covers.

[0017] Preferably, the control unit includes a timing module, in which a preset baking time is set, and the control unit controls the opening and closing of the plurality of first baking lamps, the plurality of second baking lamps, and the plurality of third baking lamps, as well as the operation of the first linear guide and the second linear guide according to the preset baking time. Through the above technical solution, the timing module starts the countdown when the control unit controls the opening of the plurality of first baking lamps, the plurality of second baking lamps, and the plurality of third baking lamps. When the countdown ends, the control unit controls the plurality of first baking lamps, the plurality of second baking lamps, and the plurality of third baking lamps to turn off and controls the first linear guide and the second linear guide to move the front cover baking unit and the rear cover baking unit back to their original positions, respectively.

[0018] The production process of an automobile body and the non-standard baking device of the present invention have the following beneficial effects:

[0019] (1) The automobile production process of the present application eliminates the PVC drying furnace in the traditional painting process. On the one hand, the number of PVC bubbles in the subsequent production process is reduced by spraying adhesive on the A side, B side and C side of the pressed edge in the glue coating process of the pressed edge in the welding process and reducing the pressing thickness of the pressed edge in the pressing process; on the other hand, a part of the PVC bubbles is released by adding a four-door and two-cover baking process to further reduce the number of PVC bubbles, and the hardness of the rubber strip is increased to improve its resistance to the torque generated by the PVC rubber strip when the varnish is cured in the subsequent drying process, and the performance of the PVC glue is improved to further improve its resistance to the torque generated by the PVC rubber strip when the varnish is cured in the subsequent drying process; on the third hand, the torque of the cured varnish on the PVC glue is reduced by reducing the thickness of the varnish spray film and lowering the baking temperature in the first heating stage, thereby reducing the risk of cracking of the PVC glue bubbles, reducing the risk of cracking of the topcoat, and improving the production quality. Therefore, the production process of the present application has the advantages of low energy consumption, low cost and high product quality.

[0020] (2) An online baking device for the baking process of the rubber strips of the four doors and two covers is designed, and a position sensor is used to detect the arrival information of the electrophoretic car body. The first linear guide, the second linear guide, the third linear guide and the fourth linear guide respectively move a plurality of baking lamps, a plurality of second baking lamps, a plurality of third baking lamps and a plurality of fourth baking lamps to the positions corresponding to the rubber strips of the four doors and two covers. The timing module measures the baking time, and the temperature sensor detects the temperature of the rubber strips to control the working power of the baking lamp. The automation of baking the rubber strips of the four doors and two covers is realized, which helps to reduce the workload of the staff, shorten the processing time of the baking process of the four doors and two covers, and improve the baking quality of the rubber strips of the four doors and two covers. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0022] Figure 1 A schematic diagram showing a production process of an automobile body according to an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of gluing the pressed edge in a production process of an automobile body according to an embodiment of the present invention is shown;

[0024] Figure 3 A block diagram of a non-standard baking device according to an embodiment of the present invention is shown;

[0025] Figure 4A side view of a non-standard baking device according to an embodiment of the present invention is shown;

[0026] Figure 5 A top view of a non-standard baking device according to an embodiment of the present invention is shown.

[0027] Description of reference numerals:

[0028] 1. Electrophoretic vehicle body driving area; 11. Baking area; 2. Position sensor; 31. Fixed frame; 32. Third linear guide rail; 33. Fourth linear guide rail; 34. First support frame; 35. First baking lamp; 36. First temperature sensor; 41. First linear guide rail; 42. Second support frame; 43. Second baking lamp; 44. Second temperature sensor; 51. Second linear guide rail; 52. Third support frame; 53. Third baking lamp; 54. Third temperature sensor; 55. Fourth support frame; 56. Fourth baking lamp; 57. Fourth temperature sensor; 6. Control unit. DETAILED DESCRIPTION

[0029] The following is a description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0030] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0031] In order to at least partially solve one or more of the above problems and other potential problems, an embodiment of the present disclosure proposes a production process for an automobile body, including a welding process and a painting process operated in sequence, the welding process includes a pressing edge gluing process and a pressing edge pressing process operated in sequence, the painting process includes an electrophoretic painting process, an electrophoretic paint drying process, a grinding process, a PVC gluing process, a four-door and two-cover rubber strip baking process, a topcoat spraying process, an overall drying process and a finishing process operated in sequence; the pressing edge gluing process: spraying adhesive on the A surface, the B surface and the C surface of the pressing edge of the four doors and two covers; the pressing edge pressing process: pressing the pressing edge of the four doors and two covers, and the pressing thickness of the pressing edge is 0.01~ 0.25mm; electrophoretic painting process: the electrophoretic body to be painted is painted using the electrophoretic process; electrophoretic paint drying process: the electrophoretic body is transported to the first drying furnace for complete drying; polishing process: the electrophoretic body after electrophoresis is polished; PVC gluing process: PVC glue is sprayed on the bottom plate of the electrophoretic body and the welds between the cockpit and the front cabin; four-door and two-cover rubber strip baking process: only the PVC rubber strips at the pressed edges on the four doors and two covers of the electrophoretic body are baked; topcoat spraying process: color paint and varnish are sprayed on the inner and outer surfaces of the electrophoretic body respectively; overall drying process: the electrophoretic body is transported to the second drying furnace for complete drying; finishing process: the dirty spots and defects of the painted body after spraying the topcoat are polished and processed.

[0032] Specifically, Figure 1 and Figure 2 As shown, the welding process includes a pressing and gluing process and a pressing and pressing process which are operated in sequence.

[0033] The pressing edge gluing process includes applying glue to the inner surfaces of the pressing edges of the four doors and two covers on the A side, B side and C side. Figure 2 The positions a, b and c shown are all sprayed with adhesive. Preferably, the adhesive filling rate of the A side of the pressed edge of the four doors and two covers is 100%, and the adhesive filling rates of the B side and the C side are both in the range of 110% to 160%.

[0034] The pressing edge pressing process includes pressing the pressing edges of the four doors and two covers, and the pressing thickness of the pressing edges is 0.01 to 0.25 mm.

[0035] The painting process includes the electrophoretic painting process, electrophoretic paint drying process, polishing process, PVC gluing process, four-door and two-cover rubber strip baking process, topcoat spraying process, overall drying process and finishing process, which are operated in sequence.

[0036] Electrophoretic painting process: The electrophoretic body to be painted is painted using the electrophoretic process; specifically, a pre-electrophoretic preparation process is provided before the electrophoretic painting process, and the pre-electrophoretic preparation process includes the following operations: cleaning the electrophoretic body from oil stains and scraps → activating the metal surface → phosphating → cleaning after phosphating → passivation → cleaning after passivation → draining. The electrophoretic painting process uses the principle of cathode electrophoresis to electrophoretically coat the electrophoretic body with an electrophoretic paint film, and then sprays to recover the electrophoretic paint and clean the floating paint, and then cleans the electrophoretic body with clean water, and finally uses compressed air to blow the gaps and gaps of the electrophoretic body.

[0037] Electrophoretic paint drying process: The electrophoretic paint body is transported to the first drying furnace for complete drying to solidify the electrophoretic paint film.

[0038] Grinding process: The electrophoretic car body is polished after electrophoresis to remove dirty spots, residual glue, etc., and blown and rubbed to remove grinding dust, fingerprints, etc.

[0039] PVC gluing process: spray PVC glue on the bottom plate of the electrophoretic body and the welds in the cockpit and the front cabin; specifically, a PVC gluing preparation process is set before the PVC gluing process, and the PVC gluing preparation process includes laying sound insulation gaskets and installing vehicle plugging parts to avoid contaminating process holes; the PVC gluing process includes first spraying PVC glue on the weld positions of the bottom plate of the electrophoretic body and spraying PVC glue on the large surface of the bottom plate of the electrophoretic body, then removing the plugging parts to re-brush the difficult-to-spray positions of the bottom plate of the electrophoretic body, and then spraying PVC glue on the welds in the cockpit and the front cabin and re-brush, and then spraying PVC glue on the pressed edges of the four doors and two covers, and finally spraying PVC glue on the door sill. Preferably, the performance requirements of PVC glue are as follows: the tensile strength ranges from 1.5 to 2.9 MPa, the elongation at break ranges from 190% to 220%, the Shore hardness ranges from 55 to 65A, and the viscosity ranges from 7000 to 8500 Pa·s.

[0040] Four-door and two-cover rubber strip baking process: only the PVC rubber strips at the pressed edges of the four doors and two covers of the electrophoretic car body are baked. The rubber strips of the four doors and two covers can be baked using a handheld baking device by the staff, or using a special baking device; preferably, the baking temperature of the PVC rubber strips is 100-140°C, and the baking time is 30-45s.

[0041] Topcoat spraying process: spray color paint and varnish on the inner and outer surfaces of the electrophoretic vehicle body respectively; specifically, the topcoat spraying process includes the following operations: pre-spraying on the outer surface of the electrophoretic vehicle body, spraying color paint on the inner surface of the electrophoretic vehicle body, spraying color paint on the outer surface of the electrophoretic vehicle body, spraying varnish on the inner surface of the electrophoretic vehicle body, and spraying varnish on the outer surface of the electrophoretic vehicle body. Preferably, the varnish spraying film thickness of the electrophoretic vehicle body where the PVC glue has been sprayed is in the range of 35um to 40um.

[0042] Overall drying process: the electrophoretic car body is transported to the second drying furnace for complete drying, so that the PVC glue, color paint and varnish are cured as a whole; preferably, the drying in the second drying furnace includes at least three stages; the baking temperature in the first heating stage is 105-115°C, and the heating time is 5-10min; the baking temperature in the second heating stage is 150-165°C, and the heating time is 5-10min; the baking temperature in the insulation stage is 150-165°C, and the insulation time is 20-30min; in this embodiment, the drying in the second drying furnace includes four stages, among which the insulation stage includes the first insulation stage and the second insulation stage, the baking temperature in the first insulation stage is 150-165°C, and the insulation time is 5-8min; the baking temperature in the second insulation stage is 150-165°C, and the insulation time is 15-20min.

[0043] Retouching process: Sand and treat the dirty spots and defects of the painted car body after spraying the topcoat.

[0044] The present application also provides a non-standard baking device, which is applied to the baking process of the four-door and two-cover rubber strips in any of the above-mentioned automobile body production processes, including a working cabin, a position sensor 2, two sets of door baking units, a front cover baking unit, a rear cover baking unit and a control unit 6; the working cabin includes an electrophoretic body driving area 1, and the electrophoretic body driving area 1 is used for the electrophoretic body transportation system to transport the electrophoretic body; a baking area 11 is arranged in the electrophoretic body driving area 1; the position sensor 2 is installed near the baking area 11, and is used to detect the position of the electrophoretic body; the two sets of door baking units are respectively arranged on both sides of the baking area 11, and are used to bake the two sides of the electrophoretic body. The four door strips on the side are baked; the door baking unit includes a first support frame 34 and a plurality of first baking lamps 35, and the plurality of first baking lamps 35 are distributed along the pattern formed by the front door opening side strips, the rear door opening side strips and the door lower edge strips of the electrophoretic vehicle body, and the plurality of first baking lamps 35 are fixedly connected to the first support frame 34; the front cover baking unit is arranged at the first end of the baking area 11, and is used for baking the front cover strips of the electrophoretic vehicle body; the front cover baking unit includes a first linear guide rail 41, a second support frame 42 and a plurality of second baking lamps 43; the guide rail of the first linear guide rail 41 is fixedly arranged on the upper part of the working cabin along the direction perpendicular to the driving direction of the electrophoretic vehicle body; the second The support frame 42 is fixedly connected to the slider of the first linear guide rail 41; a plurality of second heating lamps 43 are distributed in a pattern formed by the rubber strip of the front cover of the electrophoretic vehicle body, and the plurality of second heating lamps 43 are fixedly connected to the second support frame 42; the rear cover baking unit is arranged at the second end of the baking area 11, and is used to bake the rubber strip of the rear cover of the electrophoretic vehicle body; the rear cover baking unit includes a second linear guide rail 51, a third support frame 52 and a plurality of third heating lamps 53; the guide rail of the second linear guide rail 51 is fixedly arranged on the upper part of the working cabin along the direction perpendicular to the travel direction of the electrophoretic vehicle body; the third support frame 52 is fixedly connected to the slider of the second linear guide rail 51; a plurality of third heating lamps 53 Along the pattern formed by the rubber strips on the rear cover of the two-compartment electrophoretic vehicle body or the pattern formed by the rubber strips on the rear cover of the three-compartment electrophoretic vehicle body, a number of third heating lamps 53 are fixedly connected to the third support frame 52; the control unit 6 is communicatively connected with the position sensor 2, a number of first heating lamps 35, a first linear guide 41, a number of second heating lamps 43, a second linear guide 51, and a number of third heating lamps 53, for receiving signals from the position sensor 2, and controlling the opening and closing of the number of first heating lamps 35, the number of second heating lamps 43, and the number of third heating lamps 53, as well as the operation of the first linear guide 41 and the second linear guide 51 according to the signals from the position sensor 2.

[0045] Specifically, Figures 3 to 5As shown, the work cabin is a work space, which can be selected as a fixed space in the workshop. The work cabin includes an electrophoretic body driving area 1, which is used for the electrophoretic body transportation system to transport the electrophoretic body. The extension direction of the electrophoretic body driving area 1 is the same as the transportation direction of the electrophoretic body, and the electrophoretic body transportation system will run through the electrophoretic body driving area 1; a baking area 11 is provided in the electrophoretic body driving area 1, which is used for parking the electrophoretic body when the strips at the four doors and two covers are baked; a position sensor 2 is installed near the baking area 11, which is used to detect the position of the electrophoretic body, and when the position sensor 2 detects that the electrophoretic body arrives at the baking area 11, it transmits a signal to the control unit 6.

[0046] Two sets of door baking units are respectively arranged on both sides of the baking area 11, and are used to bake the four door rubber strips on both sides of the electrophoretic body; the door baking unit includes a first support frame 34 and a plurality of first baking lamps 35, the first baking lamps 35 are preferably short-wave infrared baking lamps, and the baking temperature range of the first baking lamps 35 is 20-180°C. The plurality of first baking lamps 35 are arranged along the front door opening side rubber strip, the rear door opening side rubber strip and the door lower edge rubber strip of the electrophoretic body to form a three-dimensional pattern as shown in the figure. Figure 4 As shown, during baking, the baking light belt formed by a number of first baking lamps 35 corresponds to the rubber strips on the side of the front door opening, the rubber strips on the side of the rear door opening and the rubber strips on the lower edge of the door, and the first baking lamps 35 are all fixedly connected to the first support frame 34; in some embodiments, the door baking unit also includes a fixed frame 31, a third linear guide 32 and a fourth linear guide 33; the fixed frames 31 of the two groups of door baking units are respectively fixedly arranged on both sides of the middle of the baking area 11 along the driving direction of the electrophoretic vehicle body; the guide rail of the third linear guide 32 is fixedly arranged on the fixed frame 31 along the vertical direction or the horizontal direction; the guide rail of the fourth linear guide 33 is perpendicular to the guide rail of the third linear guide 32, and the first support frame 34 is fixedly connected to the slider of the fourth linear guide 33 to realize the up, down, left and right adjustment of the position of the first support frame 34 to adapt to different vehicle models, where left and right refer to the transportation direction of the electrophoretic vehicle body.

[0047] The front cover baking unit is arranged at the first end of the baking area 11, and is used for baking the front cover rubber strip of the electrophoretic vehicle body; the front cover baking unit includes a first linear guide rail 41, a second support frame 42 and a plurality of second baking lamps 43; the guide rail of the first linear guide rail 41 is fixedly arranged on the upper part of the working cabin along the direction perpendicular to the travel direction of the electrophoretic vehicle body; the second support frame 42 is fixedly connected to the slider of the first linear guide rail 41; the second baking lamp 43 is preferably a short-wave infrared baking lamp, and the baking temperature range of the second baking lamp 43 is 20 to 180°C, and the plurality of second baking lamps 43 are arranged along the rubber strip of the front cover of the electrophoretic vehicle body to form a three-dimensional pattern as shown in the figure. Figure 4 and Figure 5 As shown, during baking, the baking lamp belt formed by the plurality of second baking lamps 43 corresponds exactly to the front cover rubber strip, and the plurality of second baking lamps 43 are all fixedly connected to the second support frame 42 .

[0048] The rear cover baking unit is arranged at the second end of the baking area 11, and is used for baking the rubber strip of the rear cover of the electrophoretic vehicle body; the rear cover baking unit includes a second linear guide rail 51, a third support frame 52 and a plurality of third baking lamps 53; the guide rail of the second linear guide rail 51 is fixedly arranged on the upper part of the working cabin along the direction perpendicular to the travel direction of the electrophoretic vehicle body; the third support frame 52 is fixedly connected to the slider of the second linear guide rail 51; the third baking lamp 53 is preferably a short-wave infrared baking lamp, and the baking temperature range of the third baking lamp 53 is 20 to 180°C, and the plurality of third baking lamps 53 are arranged along the three-dimensional pattern formed by the rubber strip of the rear cover of the two-box electrophoretic vehicle body or the three-box electrophoretic vehicle body The three-dimensional pattern formed by the rubber strip of the rear cover of the sedan electrophoretic vehicle body is distributed as shown in the figure Figure 4 and Figure 5 As shown, several third heating lamps 53 are all fixedly connected to the third support frame 52; preferably, the rear cover baking unit also includes a fourth support frame 55 and several fourth heating lamps 56; the second linear guide 51 is a double-slider linear guide, the third support frame 52 is fixedly connected to one of the sliders, and the fourth support frame 55 is fixedly connected to the other slider; several third heating lamps 53 are distributed along the three-dimensional figure formed by the rubber strips of the rear cover of the two-compartment electrophoretic vehicle body, so that when baking, the heating lamp belts formed by the several third heating lamps 53 correspond to the rubber strips of the rear cover of the two-compartment electrophoretic vehicle body; the fourth heating lamp 56 is preferably a short-wave infrared heating lamp, and the baking temperature range of the fourth heating lamp 56 is 20 to 180°C. Several fourth heating lamps 56 are distributed along the three-dimensional figure formed by the rubber strips of the rear cover of the three-compartment electrophoretic vehicle body, so that when baking, the heating lamp belts formed by the several fourth heating lamps 56 correspond to the rubber strips of the rear cover of the three-compartment electrophoretic vehicle body, and several fourth heating lamps 56 are fixedly connected to the fourth support frame 55.

[0049] The control unit 6 is communicatively connected with the position sensor 2, the third linear guide 32, the fourth linear guide 33, the plurality of first heating lamps 35, the first linear guide 41, the plurality of second heating lamps 43, the second linear guide 51, the plurality of third heating lamps 53, and the plurality of fourth heating lamps 56, and is used for receiving signals from the position sensor 2, and controlling the opening and closing of the plurality of first heating lamps 35, the plurality of second heating lamps 43, the plurality of third heating lamps 53, and the plurality of fourth heating lamps 56, as well as the operation of the third linear guide 32, the fourth linear guide 33, the first linear guide 41, and the second linear guide 51 according to the signals from the position sensor 2.

[0050] Preferably, the control unit 6 includes a timing module, in which a preset baking time is set. The control unit 6 controls the opening and closing of several first baking lamps 35, several second baking lamps 43, several third baking lamps 53 and several fourth baking lamps 56, as well as the operation of the first linear guide 41 and the second linear guide 51 according to the preset baking time.

[0051] Preferably, the control unit 6 is communicated with the transportation system and is used to control the operation of the transportation system. When the control unit 6 receives the signal from the position sensor 2, it controls the transportation system to pause. When the baking is completed, the control unit 6 controls the operation of the transportation system to transport the baked electrophoretic body out and transport the electrophoretic body to be baked to the baking area 11.

[0052] Preferably, the baking device of the present application also includes an identification unit for identifying the model of the electrophoretic vehicle body, wherein the technology for model identification is prior art; the identification unit is communicated with the control unit 6, and the control unit 6 is used to control the operation of the two sliders on the second linear guide rail 51 according to the model identified by the identification unit, as well as the operation of the third linear guide rail 32 and the fourth linear guide rail 33 to adjust the position of the first support frame 34.

[0053] Preferably, the first support frame 34, the second support frame 42, the third support frame 52 and the fourth support frame 55 are respectively provided with the first temperature sensor 36, the second temperature sensor 44, the third temperature sensor 54 and the fourth temperature sensor 57, which are used to measure the temperature of the door rubber strip, the front cover rubber strip and the rear cover rubber strip respectively; the first temperature sensor 36, the second temperature sensor 44, the third temperature sensor 54 and the fourth temperature sensor 57 are all communicatively connected with the control unit 6, and the control unit 6 controls the operating power of the first heating lamps 35 or the second heating lamps 43 or the third heating lamps 53 or the fourth heating lamps 56 according to the measurement results of the first temperature sensor 36 or the second temperature sensor 44 or the third temperature sensor 54 or the fourth temperature sensor 57.

[0054] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the present invention.

Claims

1. A process for producing an automobile body, comprising a welding process and a painting process which are operated in sequence, characterized in that: The welding process includes the pressing and gluing process and the pressing and pressing process, which are operated in sequence. The painting process includes the electrophoretic painting process, the electrophoretic paint drying process, the grinding process, the PVC gluing process, the four-door and two-cover rubber strip baking process, the topcoat spraying process, the overall drying process and the finishing process, which are operated in sequence. Pressed edge gluing process: spray glue on the A, B and C surfaces of the pressed edges of the four doors and two covers; Pressing edge pressing process: Pressing the pressing edges of the four doors and two covers, and the pressing thickness of the pressing edges is 0.01 to 0.25 mm; Electrophoretic painting process: The electrophoretic body to be painted is painted using the electrophoretic process; Electrophoretic paint drying process: the electrophoretic paint body is transported to the first drying furnace for complete drying; Polishing process: polish the electrophoretic car body after electrophoresis; PVC glue coating process: spray PVC glue on the bottom plate of the electrophoretic car body and the welds between the cockpit and the front cabin; Four-door and two-cover rubber strip baking process: only the PVC rubber strips at the pressed edges of the four doors and two covers of the electrophoretic car body are baked; Topcoat spraying process: spraying color paint and clear varnish on the inner and outer surfaces of the electrophoretic car body respectively; Overall drying process: the electrophoretic car body is transported to the second drying oven for complete drying; Retouching process: Sand and treat the dirty spots and defects of the painted car body after spraying the topcoat.

2. The process for producing an automobile body according to claim 1, characterized in that: In the four-door and two-cover rubber strip baking process, the baking temperature of the PVC rubber strip is 100-140° C., and the baking time is 30-45 seconds.

3. The process for producing an automobile body according to claim 1, characterized in that: The glue filling rates of the B surface and the C surface of the pressed edge are both 110% to 160%.

4. The process for producing an automobile body according to claim 1, characterized in that: The performance requirements of the PVC glue are as follows: the tensile strength ranges from 1.5 to 2.9 MPa, the elongation at break ranges from 190% to 220%, the Shore hardness ranges from 55 to 65A, and the viscosity ranges from 7000 to 8500 Pa·s.

5. The process for producing an automobile body according to claim 1, characterized in that: When spraying clear varnish in the topcoat spraying process, the clear varnish spraying film thickness of the electrophoretic vehicle body where the PVC glue has been sprayed is in the range of 35um to 40um.

6. The process for producing an automobile body according to claim 1, characterized in that: The drying in the second drying furnace includes at least three stages; the baking temperature in the first heating stage is 105-115°C, and the heating time is 5-10 minutes; the baking temperature in the second heating stage is 150-165°C, and the heating time is 5-10 minutes; the baking temperature in the insulation stage is 150-165°C, and the insulation time is 20-30 minutes.

7. A non-standard baking device, applied to the baking process of four-door and two-cover rubber strips in the production process of an automobile body as claimed in any one of claims 1 to 6, characterized in that: It comprises a working cabin, a position sensor (2), two sets of door baking units, a front cover baking unit, a rear cover baking unit and a control unit (6); The working cabin comprises an electrophoretic vehicle body running area (1), and the electrophoretic vehicle body running area (1) is used for the electrophoretic vehicle body transportation system to transport the electrophoretic vehicle body; a baking area (11) is arranged in the electrophoretic vehicle body running area (1); A position sensor (2) is installed near the baking area (11) and is used to detect the position of the electrophoretic vehicle body; Two groups of door baking units are respectively arranged on both sides of the baking area (11) and are used to bake the four door rubber strips on both sides of the electrophoretic vehicle body; the door baking units include a first support frame (34) and a plurality of first baking lamps (35), the plurality of first baking lamps (35) are distributed along a pattern formed by the front door opening side rubber strip, the rear door opening side rubber strip and the door lower edge rubber strip of the electrophoretic vehicle body, and the plurality of first baking lamps (35) are all fixedly connected to the first support frame (34); The front cover baking unit is arranged at the first end of the baking area (11) and is used for baking the rubber strip of the front cover of the electrophoretic vehicle body; the front cover baking unit comprises a first linear guide rail (41), a second support frame (42) and a plurality of second baking lamps (43); the guide rail of the first linear guide rail (41) is fixedly arranged on the upper part of the working cabin along a direction perpendicular to the travel direction of the electrophoretic vehicle body; the second support frame (42) is fixedly connected to the slider of the first linear guide rail (41); the plurality of second baking lamps (43) are distributed in a pattern formed by the rubber strip of the front cover of the electrophoretic vehicle body, and the plurality of second baking lamps (43) are all fixedly connected to the second support frame (42); The rear cover baking unit is arranged at the second end of the baking area (11) and is used for baking the rubber strip of the rear cover of the electrophoretic vehicle body; the rear cover baking unit comprises a second linear guide rail (51), a third support frame (52) and a plurality of third baking lamps (53); the guide rail of the second linear guide rail (51) is fixedly arranged on the upper part of the working cabin along a direction perpendicular to the travel direction of the electrophoretic vehicle body; the third support frame (52) is fixedly connected to the slider of the second linear guide rail (51); the plurality of third baking lamps (53) are distributed along a pattern formed by the rubber strip of the rear cover of a two-box electrophoretic vehicle body or a pattern formed by the rubber strip of the rear cover of a three-box electrophoretic vehicle body, and the plurality of third baking lamps (53) are all fixedly connected to the third support frame (52); The control unit (6) is communicatively connected with the position sensor (2), the plurality of first heating lamps (35), the first linear guide rail (41), the plurality of second heating lamps (43), the second linear guide rail (51), and the plurality of third heating lamps (53), and is used for receiving signals from the position sensor (2), and controlling the opening and closing of the plurality of first heating lamps (35), the plurality of second heating lamps (43), and the plurality of third heating lamps (53), as well as the operation of the first linear guide rail (41) and the second linear guide rail (51) according to the signals from the position sensor (2).

8. The non-standard baking device according to claim 7, characterized in that: The rear cover baking unit also includes a fourth support frame (55) and a plurality of fourth baking lamps (56); the second linear guide rail (51) is a double-slider type linear guide rail, the third support frame (52) is fixedly connected to one of the sliders, and the fourth support frame (55) is fixedly connected to the other slider; the plurality of third baking lamps (53) are distributed along a pattern formed by the rubber strips of the rear cover of the two-box electrophoretic vehicle body, and the plurality of fourth baking lamps (56) are distributed along a pattern formed by the rubber strips of the rear cover of the three-box electrophoretic vehicle body, and the plurality of fourth baking lamps (56) are fixedly connected to the fourth support frame (55).

9. The non-standard baking device according to claim 8, characterized in that: It also includes an identification unit for identifying the type of electrophoretic vehicle body; the identification unit is in communication connection with a control unit (6), and the control unit (6) is used to control the operation of two slide blocks on the second linear guide rail (51) according to the type of vehicle identified by the identification unit.

10. A non-standard baking device according to claim 7 or 9, characterized in that: The door baking unit further comprises a fixing frame (31), a third linear guide rail (32) and a fourth linear guide rail (33); the fixing frames (31) of the two sets of door baking units are respectively fixedly arranged on both sides of the middle of the baking area (11) along the running direction of the electrophoretic vehicle body; the guide rail of the third linear guide rail (32) is fixedly arranged on the fixing frame (31) along the vertical direction or the horizontal direction; the guide rail of the fourth linear guide rail (33) is perpendicular to the guide rail of the third linear guide rail (32), and the first support frame (34) is fixedly connected to the slider of the fourth linear guide rail (33); the third linear guide rail (32) and the fourth linear guide rail (33) are both connected to the control unit (6) for communication, and the control unit (6) controls the operation of the third linear guide rail (32) and the fourth linear guide rail (33).

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