FR2918076A1 - DEVICE FOR THERMALLY PROCESSING MACHINING PARTS. - Google Patents

Abstract

The invention presented relates to a channel-type device (1) for the heat treatment of machining parts (7), including body parts or complete boxes. The device comprises at least one treatment zone (2, 3) for the passage of the workpiece (7) to be subjected to heat treatment and gas outlet openings (5) located on the walls of the channel (4). from the treatment zone (2, 3) from which flows a gas flow (6) enveloping the workpiece (7) to be subjected to heat treatment. The gas outlet openings (5) of the treatment zone (2, 3) are arranged only on the channel walls (4) facing each other.

Description

- 1 -

  The present invention relates to a channel-type device for the heat treatment of machining parts, including body parts or whole boxes. "Heat treatment" refers in the following temperature change caused on the workpiece that can cause a warming and / or cooling of the workpiece. Nowadays, in automobile construction, the parts of the body to be painted are cleaned and especially washed before being painted, which requires drying before the actual painting procedure. After drying and before actual painting of the body parts, they must be cooled to a suitable temperature to ensure a correct painting procedure. The drying of the body parts can be done for example by a blower of hot air. Normally, the drying equipment is a channel-type device through which the workpiece to be dried, for example a hood, passes. During the passage of the workpiece, it is dried by a stream of hot air. To do this, common drying devices work with a high outgoing air flow and outgoing air openings often disposed in a manner causing counter-currents or even mutual elimination already at a short distance from drafts. coming out of these outgoing air openings. These counter-currents or the elimination of air currents cause the inefficiency of the drying procedure, thus increasing the duration and the energy consumption of the drying. This - 2 -

  This finding is also valid for the cooling of workpieces. The present invention solves this problem and provides an improved device for the heat treatment of workpieces. The present invention solves this problem with the object of independent claim 1. Advantageous embodiments are the subject of the dependent claims.

  The invention is based on the general idea of providing at least one treatment zone that can be traversed by the workpiece to be subjected to heat treatment by arranging gas outlet openings in the walls of the channel of the zone. treatment from which flows a gas flow during operation of the device surrounding the workpiece to be subjected to heat treatment. The gas outlet openings of the treatment zone are disposed exclusively on the facing channel walls. The device presented differs from existing equipment in that it blows a flow of gas not simultaneously from three or four channel walls which constitute the channel on the part to be subjected to heat treatment but from only the outlet openings of gas positioned in two channel walls facing each other which prevents any weakening or elimination of gas flows that meet. Finally, this device makes it possible to significantly increase the speed of the gas flow required for the heat treatment in the different treatment zones, which contributes to the efficiency of the heat treatment.

  of the workpiece. The improvement of the thermal treatment also makes it possible to significantly reduce the energy requirements compared to the traditional devices while guaranteeing a reduction of the cycle times thanks to the efficiency of the heat treatment. Thus, the device globally reduces the duration of treatment and costs, and protect the environment through the control of energy. In an advantageous improvement of the solution proposed by the invention, the gas outlet openings on a channel wall are offset horizontally and / or vertically with respect to the gas outlet openings of the opposite channel wall in the same direction. treatment area. This offset positioning of the gas outlet openings placed face to face has the consequence that the gas flows leaving the gas outlet openings do not cause counter-currents, but move essentially in parallel and offset with respect to each other. to greatly reduce their interaction and in particular to significantly reduce their weakening. This arrangement also makes it possible to increase the flow rate of the gas flow throughout the treatment zone and thus contributes to the efficiency and economy of the heat treatment process.

  According to a possible advantageous embodiment of the invention, the device is designed as a drying device, the treatment zone constituting a drying zone. In this case, the device may be provided with a heating system producing a flow of - 4 -

  hot gas, and in particular a flow of hot air, usable for drying machining parts. The heating installation thus produces a flow of gas, and in particular a flow of hot air, or very hot, to increase the water vapor absorption capacity and thus accelerate the desired drying process. The device can alternatively be used as a cooling device, the treatment zone constituting a cooling zone. In this case, the device is provided with a cooling installation producing a flow of cold gas, and in particular a cold air flow, usable for the cooling of the workpieces. The improvement of the heat absorption capacity thanks to the flow of cold gas advantageously makes it possible to accelerate the cooling process. The heat treatment of the machining parts can be carried out before the subsequent painting of the machining parts and / or after the previous painting of the machining parts. Other important features and advantages of the invention result from secondary claims, drawings and descriptions relating to representations in the drawings. It is obvious that the above-mentioned characteristics and characteristics described below apply not only to the given combination, but also to other combinations or to the individual device, without departing from the scope of the present invention. Examples of preferred embodiments of the invention are represented by the drawings and

  explained in more detail in the following description knowing that the same references are used for identical elements, similar elements and elements of the same functionality. The figures represent each time schematically. Figure 1 an exploded view of the device according to the invention for the heat treatment of 10 machining parts, Figures 2a, b a section of the device according to Figure 1, Figure 3 a channel wall according to the invention with outlet openings gas. According to FIG. 1, the channel-type device 1 for the heat treatment of machining parts 7 described in the present invention has in particular a device 1 for drying body parts before their subsequent painting; at least one and, in the example shown, two drying zones 2 and 3 through which can pass successively the piece to be dried 7. The number of drying zones 2, 3 shown in Figure 1 serves only for example and in no way excludes additional drying zones at zones 2, 3 not shown in FIG. 1 for drying the machining pieces 7. The channel walls 4 of the different drying zones 2, 3 have openings gas outlet 5 from which flows a gas stream 6 enveloping the workpiece to be dried 7 during operation of the device 1 (see Figures 2a and b and Figure 3). In order to improve the drying effect in the device 1, the openings

  gas outlet 5 in the different drying zones 2, 3 are arranged exclusively in the channel walls 4 and 4 'facing each other. The device uses as channel walls 4 vertical channel walls 4, 4 'and horizontal channel walls 8, 9 such as a floor 9 and / or a ceiling 8. Unlike traditional drying devices for drying parts 7, which are often provided with gas outlet openings on the four channel walls, the invention provides gas outlet openings only positioned on two channel walls 4, 4 'facing each other. This arrangement has the major advantage of not hinder or even cancel mutually gas flows 6 leaving the channel walls 4, 4 'facing each other. Thus, the device increases in particular the flow rate of the flow in the respective drying zone 2, 3 thus improving the drying. In order to further improve the flow conditions in the respective drying zones 2, 3, the gas outlet openings 5 of a channel wall 4 are offset horizontally and / or vertically with respect to the gas outlet openings. 5 'of the opposite channel wall 4' (see Figure 2b). This device thus avoids the positioning of the gas outlet openings 5 and 5 'facing each other which would cancel each other out or which would produce at least countercurrent flow of air. As can be seen in FIGS. 2a and 2b, the gas outlet openings 5, 5 'of a vertical channel wall 4, 4' produce a substantially horizontal gas flow 6 'and 6 - 7 -

  while the gas outlet openings not shown in a horizontal channel wall, for example a ceiling 8 or a floor 9 of the device 1 produce a substantially vertical gas flow 6 ", 6" '. In accordance with FIGS. 2a and 2b, a drying zone 2 is shown in which a substantially horizontal gas flow 6 is produced, while FIG. 2b shows in broken lines, as an example, gas outlet openings 5 "and 5 "'at the ceiling 8 and the floor 9 which would produce a gas flow substantially vertical 6" and 6 "'. As a general rule, the gas outlet openings of a drying zone are positioned either in the vertical channel walls 4 and 4 'or in the horizontal channel walls 8 and 9; thus, the machining part 7 is exposed during the passage through individual drying zones 2, 3 in succession to a vertical gas flow 6 ", 6" 'before being exposed or after having been exposed to a horizontal gas flow 6 and 6 '. Each of the drying zones 2, 3 or each of all the other unrepresented drying zones thus produce gas flows that are horizontal or vertical. The drying zones 2, 3 or the other drying zones of the device 1 are preferably positioned in such a way as to ensure the alternative exposure of the machining part 7 to horizontal and vertical gas flows during the crossing of the zones. drying 2, 3. It is also possible to provide a heating system 10 (see FIG.

  produces a flow of hot air that can be used for drying the machining parts 7. This system further improves the drying result. It is also possible to provide the device 1 according to FIG. 1 and FIG. 2a not only with external channel walls 4 and 4 ', but also with an intermediate partition wall 11 also equipped with gas outlet openings 5 according to the invention.

  Figure 3 shows a section of the channel wall 4 according to this invention which contains gas openings 5 in a defined pattern. A gas outlet opening 5 'is disposed on a channel wall 4' opposite the wall of the channel 4, preferably in a position in accordance with Fig. 3 represented by the broken lines. In the case of gas outlet openings 5 to 5 "'described in the above paragraphs, these are generally nozzles providing the flow of the drying fluid, in particular of the air inlet nozzles. above the device 1 relating to the drying process can also be used correspondingly for a cooling process-in which case, a cooling device 10 (see Figure 1) generates a flow of cold air for cooling machining parts 7. In order to improve the drying and / or cooling results, it is possible to install in each case several drying or cooling zones in series with flow directions of different streams.

  In this case, it is possible to define a positioning of the gas outlet openings according to the geometry of the gas outlet openings to avoid any alteration of the efficiency of the adjacent gas outlet openings.

Claims (8)

  1. Channel-type device (1) for the heat treatment of workpieces (7), in particular of body pieces or whole boxes, with at least one treatment zone (2, 3) serving for the passage the machining part (7) to be subjected to the heat treatment, - provided with gas outlet openings (5) located on the channel walls (4) of the treatment zone (2, 3) from which a flow flows out. of enveloping gas (6) the workpiece (7) to be subjected to heat treatment during operation of the device (1), - the gas outlet openings (5) of the treatment zone (2, 3) being arranged exclusively on the channel walls (4) facing each other.   2. Device according to claim 1, characterized in that the gas outlet openings (5) on a wall of the channel (4) are offset horizontally and / or vertically with respect to the gas outlet openings (5 ') of the opposite channel wall (4 ').   Clamping device according to claim 1 or 2, characterized in that the gas outlet openings (5 ", 5" ') of a horizontal channel wall (8, 9) produce a substantially vertical flow of gas ( 6 ", 6" '), whereas the gas outlet openings (5, 5') of a vertical channel wall (4, 4 ') produce a substantially horizontal gas flow (6, 6'). ).   4. Device according to one of claims 1 to 3, characterized in that the device (1) is designed as a drying device, the treatment zone (2, 3) constituting a drying zone.   5. Device according to claim 4, characterized in that the device (1) is provided with a heating installation (10) producing a flow of hot air (6) used for drying the machining parts (7) .   6. Device according to one of claims 1 to 3, characterized in that the device (1) is designed as a cooling device, the treatment zone (2, 3) constituting a cooling zone.   7. Device according to claim 6, characterized in that the device (1) is provided with a cooling installation (10) producing a cold air flow (6) used for cooling the workpieces (7) .   8. Device according to one of the preceding claims, characterized in that the heat treatment of the workpieces (7) is performed before the subsequent painting of the workpieces and / or after the previous painting of the workpieces.