JP2014077565A - Multistage heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact multistage heating furnace which reduces an installation area in a factory.SOLUTION: A multistage heating furnace 100 comprises a plurality of heating furnace units 100-1 to 100-10 piled up in a vertical direction. Each heating furnace unit has: an upper heater 102A and a lower heater 101A which are vertically arranged with a heat insulation material 103A placed in between; a support pipe 104A arranged on one end portion of the upper heater 102A in a manner that horizontally extends; a support pipe 104B arranged on the other end portion of the upper heater 102A in a manner that horizontally extends; and a plurality of workpiece support rods 106 which are installed across the support pipes 104A and 104B. A rear surface of a workpiece W1 supported by the workpiece support rod 106 faces opposite to the upper heater 102A. An upper surface of the workpiece W1 faces opposite to the lower heater 101A of the heating furnace unit immediately above.

Description

  The present invention relates to a multistage heating furnace in which a plurality of heating furnace units are stacked in the vertical direction.

  In parts for vehicles, both safety and economy are achieved by using a member having a reduced thickness and a high strength. For this purpose, a so-called hot press is known in which a steel plate heated to a high temperature is cooled by a low-temperature press die and quenched. In this method, the steel sheet is heated to the austenitizing temperature or higher, and rapidly cooled at the same time as forming with a press die to perform quenching.

  As a heating furnace used for hot pressing, as shown in FIG. 11, a large number of lower heaters 1 and upper heaters 2 are juxtaposed in a horizontal direction, and a steel plate W is placed between the lower heaters 1 and the upper heaters 2. What is heated while conveying from the inlet to the outlet is known. The steel plates W are successively fed from the inlet of the heating furnace and heated by the lower heater 1 and the upper heater 2 until being discharged from the outlet.

JP 2010-44875 A

  Although the conventional heating furnace can heat a plurality of steel plates W one after another, since a large number of lower heaters 1 and upper heaters 2 are arranged in parallel in the horizontal direction, the installation area of the heating furnace in the factory is large. There was a problem of becoming. In addition, among the many lower heaters 1 and 2, even if one heater breaks down due to disconnection or the like, there is a problem that all the steel plates W put into the heating furnace become defective due to insufficient heating. there were.

  In view of the above-described problems, the present invention provides a multi-stage heating furnace in which a plurality of heating furnace units are stacked in the vertical direction, and each heating furnace unit has a plate-like upper heater that is stacked with a heat insulating material interposed therebetween in the vertical direction. And a lower heater, a first support pipe arranged to extend in a horizontal direction on one end of the upper heater, and arranged to extend in a horizontal direction on the other end of the upper heater. A second support pipe; and a plurality of work support bars laid over the first and second support pipes, wherein a back surface of the work supported by the plurality of work support bars faces the upper heater. The upper surface of the workpiece is arranged to face the lower heater of the heating furnace unit adjacent to the upper side.

  According to the present invention, since the configuration of a multistage heating furnace in which a plurality of heating furnace units are stacked in the vertical direction is adopted, the installation area of the heating furnace can be reduced, and each heating furnace unit is heated independently. Since it functions as a furnace, even if one heating furnace unit fails, the other heating furnace units are not affected.

  In addition, according to the present invention, since the vertical dimension of one heating furnace unit can be reduced, the overall vertical dimension of the heating furnace can be reduced.

It is a figure which shows the whole installation in a hot press. It is a front view of the multistage heating furnace in the embodiment of the present invention. It is a top view of one heating furnace unit of the multistage heating furnace of FIG. FIG. 4 is a left side view of FIG. 3. It is a top view of a workpiece conveyance machine. It is a 1st top view which shows the mode of the workpiece conveyance by a workpiece conveyance machine. It is a 2nd top view which shows the mode of the workpiece conveyance by a workpiece conveyance machine. It is a 3rd top view which shows the mode of the workpiece conveyance by a workpiece conveyance machine. It is a side view which shows the mode of the workpiece conveyance by a workpiece conveyance machine. It is sectional drawing of a support pipe and a workpiece conveyance rod. It is a figure which shows the conventional heating furnace.

  FIG. 1 is a diagram showing the entire equipment in a hot press. As shown in the figure, a multistage heating furnace 100, two workpiece transfer machines 200A and 200B, and a press machine 300 having a press die are arranged. 200 A of workpiece conveyance machines are arrange | positioned in the entrance side of the multistage heating furnace 100 in order to throw in workpieces, such as a steel plate, to the multistage heating furnace 100, and the workpiece conveyance machine 200B discharge | releases a workpiece | work from the multistage heating furnace 100. Therefore, it is disposed on the discharge port side of the multistage heating furnace 100.

  The multistage heating furnace 100 is formed by stacking a plurality of heating furnace units in the vertical direction. In this example, the heating furnace units 100-1 to 100-10 are stacked.

  The input work transfer machine 200A and the discharge work transfer machine 200B basically have the same configuration, and a plurality of work transfer bars 201 and ends of the plurality of work transfer bars 201 are connected to each other. , A horizontal movement mechanism 205 for moving on the horizontal rail 204, and a vertical movement mechanism 207 for moving the horizontal rail 204 on the vertical rail 206.

  As a result, the workpiece can be moved in the horizontal direction and the vertical direction while being supported on the plurality of workpiece conveying rods 201, and can be inserted into any heating furnace unit 100 -X of the multistage heating furnace 100. The workpieces are loaded together with a plurality of workpiece conveying rods 201 of the workpiece conveying machine 200A. The workpiece | work thrown into the heating furnace unit 100-X is heated more than the austenitizing temperature.

  When the heating of the workpiece is completed, the plurality of workpiece conveyance bars 201 of the discharge workpiece conveyance machine 200B are inserted into any heating furnace unit 100-X of the multistage heating furnace 100, and the workpiece is a plurality of workpiece conveyance rods 201. In the state supported above, it is discharged from the multistage heating furnace 100. And the workpiece | work discharged | emitted from the multistage heating furnace 100 is rapidly cooled and quenched simultaneously with shaping | molding with the press die of the press machine 300. FIG.

  Hereinafter, the configuration of the multistage heating furnace 100 and the workpiece transfer machines 200A and 200B will be described.

<Configuration of multi-stage heating furnace 100>
2 is a front view of the multistage heating furnace 100, FIG. 3 is a plan view of one heating furnace unit of the multistage heating furnace of FIG. 2, and FIG. 4 is a left side view of FIG. In FIG. 2, only four heating furnace units 100-1 to 100-4 are shown.

The heating furnace units 100-1 to 100-10 basically have the same configuration.
Two plate-like lower heaters 101A and 101B are provided adjacent to each other in the horizontal direction at the bottom of the heating furnace unit 100-1. On the lower heaters 101A and 101B, the upper heaters 102A and 102B are stacked so as to face each other with the heat insulating materials 103A and 103B interposed therebetween. Each of the lower heaters 101A and 101B is provided with a pair of electrodes 109A and 109B for supplying power, and each of the upper heaters 102A and 102B is provided with a pair of electrodes 110A and 110B for supplying power. The lower heaters 101A and 101B and the upper heaters 102A and 102B are preferably far infrared heaters that emit far infrared rays.

  A support pipe 104A is provided in the vicinity of the inlet of the left heating furnace unit 100-1 in FIG. 2 so as to extend in the horizontal direction (Y direction) on one end of the upper heater 102A. A support pipe 104B is provided in the vicinity of the center of the heating furnace unit 100-1 so as to extend in the horizontal direction (Y direction) on the ends of the upper heaters 102A and 102B. A support pipe 104C is provided in the vicinity of the outlet of the heating furnace unit 100-1 on the right side of FIG. 2 so as to extend in the horizontal direction (Y direction) on one end of the upper heater 102B.

  The support pipes 104A are inserted into a plurality (for example, five) of bases 105A provided with a predetermined interval. Similarly, the support pipes 104B and 104C are inserted into the bases 105B and 105C, respectively.

  Support bases 111A, 111B, and 111C are erected on bases 105A, 105B, and 105C, respectively. Concave portions are formed on the upper surfaces of the support bases 111A, 111B, and 111C. A plurality of (for example, five) workpiece support rods 106 are stretched in the horizontal direction (X direction) on the three support pipes 104A to 104C. In this case, the work support bar 106 is fitted into the recesses of the support bases 111A, 111B, and 111C.

  The two workpieces W1 and W2 introduced from the insertion port by the workpiece transfer machine 200A are supported on these workpiece support rods 106. The workpieces W1 and W2 are, for example, vehicle parts and are formed of a steel plate having a predetermined shape. A charging door 107 and a discharging door 108 that can be opened and closed are respectively attached to the charging port and the discharging port of the heating furnace unit 100-1.

  The heating furnace unit 100-1 is housed in a casing, and the heating furnace unit 100-2 having the same configuration is stacked thereon. Furthermore, the heating furnace units 100-3 to 100-10 are stacked in order.

  In this case, the back surface of the workpiece W1 input to the heating furnace unit 100-1 faces the upper heater 102A, and the upper surface of the workpiece W1 faces the lower heater 101A of the second-stage heating furnace unit 100-2 adjacent to the upper side. To do. Further, the back surface of the work W2 charged into the heating furnace unit 100-1 faces the upper heater 102B, and the upper surface of the work W2 faces the lower heater 101B of the second-stage heating furnace unit 100-2 adjacent to the upper side. .

  As described above, according to the multistage heating furnace 100, the heating furnace units 100-1 to 100-10 are stacked in the vertical direction, so that the installation area can be reduced and the space of the factory can be saved. Can do. Moreover, since each heating furnace unit functions as an independent heating furnace, even if one heating furnace unit fails, it does not affect another heating furnace unit. The number of heating furnace units can be appropriately increased or decreased according to the required number of production requests.

  Furthermore, according to the multistage heating furnace 100, the lower heaters 101A and 101B and the upper heaters 102A and 102B are stacked on the bottoms of the heating furnace units 100-1 to 100-10 with the heat insulating materials 103A and 103B interposed therebetween. Since the configuration in which the work support rod 106 is stretched over the upper heaters 102A and 102B is adopted, the vertical dimension of the heating furnace units 100-1 to 100-10 can be reduced, The multistage heating furnace 100 can be configured compactly as a whole.

  The heating furnace units 100-1 to 100-10 are provided with two lower heaters 101A and 101B and two upper heaters 102A and 102B in order to input two workpieces W1 and W2. However, the number of heaters can be increased or decreased according to the number of workpieces inserted, and the number of support pipes and workpiece support bars can be increased or decreased accordingly.

  Since the lower heaters 101A and 101B of the lowermost heating furnace unit 100-1 and the upper heaters 102A and 102B of the uppermost heating furnace unit 100-10 have no work to be heated, in order to save power, It can be a dummy heater that is not used, or it can be removed.

  The support pipes 104A, 104B, and 104C are loaded with the workpieces W1 and W2 and the workpiece support rod 106, and are likely to be thermally deformed by heating of the heating furnace units 100-1 to 100-10. If thermal deformation occurs in the support pipes 104A, 104B, and 104C, the workpieces W1 and W2 may be displaced or dropped. Therefore, thermal deformation can be suppressed by flowing cooling water through the support pipes 104A, 104B, and 104C.

  10A and 10B are cross-sectional views showing the structure of the support pipes 104A, 104B, and 104C, and FIG. 10B is a cross-sectional view taken along line XX in FIG. As shown in the figure, the support pipes 104A to 104C are inserted with an outer pipe 112 having one end closed by a plug 114 and the other end opened, and a gap in the outer pipe 112. And an opened inner pipe 113. Then, the cooling water is injected into the inner pipe 113 from the opening of the inner pipe 113 by a cooling water injection means such as a water tap. The cooling water injected into the inner pipe 113 hits the plug 114 and flows in the reverse direction through the gap and is collected. With this configuration, the cooling water path is doubled, a high cooling effect is obtained, and the piping of the cooling water can be saved.

<Configuration of workpiece transfer machines 200A and 200B>
As described above, the workpiece transfer machine 200A is used to put the workpieces W1 and W2 into the multistage heating furnace 100, and the workpiece transfer machine 200B is used to take out the workpieces W1 and W2 from the multistage heating furnace 100. Both machines have the same configuration.

  FIG. 1 is a front view of the workpiece transfer machine 200A, FIG. 5 is a plan view of the workpiece transfer machine 200A, and FIGS. 6 to 8 are plan views showing how workpieces are transferred by the workpiece transfer machine 200A. FIG. 9 is a side view showing a state of workpiece conveyance by the workpiece conveyance machine 200A.

  The workpiece transfer machine 200A includes a plurality of (for example, six) workpiece transfer rods 201 extending in the horizontal direction and a horizontal movement mechanism that connects the ends of these workpiece transfer rods 201 and moves them on a horizontal rail 204. 205, a vertical movement mechanism 207 (see FIG. 1) for moving the work transfer machine body including the horizontal rail 204 on the vertical rail 206 is provided.

  The horizontal movement mechanism 205 and the vertical movement mechanism 207 can be composed of, for example, wheels that respectively travel on the horizontal rail 204 and the vertical rail 206, and a motor that rotationally drives the wheels.

  The workpieces W1 and W2 are supported at predetermined positions on the six workpiece conveyance rods 201. However, if the workpiece conveyance rods 201 are moved as they are, the workpieces W1 and W2 may be displaced or dropped. Therefore, a pair of guide bars 202 are attached to each workpiece transport bar 201 in parallel. A pair of ring-shaped workpiece restricting tools 203A and 203B is attached to each guide bar 202, and the workpiece restricting tools 203A and 203B are positioned in accordance with the planar shape of the workpieces W1 and W2, whereby the workpieces W1 and W2 are positioned. The movement is restricted by pressing from both sides.

  The operation of the workpiece transfer machine 200A will be described with reference to FIGS. First, as shown in FIG. 6, the workpieces W1 and W2 are placed on the workpiece conveying rod 201, and the movements of the workpieces W1 and W2 are regulated by the workpiece regulating tools 203A and 203B. Then, the workpiece transfer machine body is vertically moved by the vertical movement mechanism 207 to the height of the heating furnace unit into which the workpieces W1 and W2 are to be put.

  Next, as shown in FIGS. 7 and 9 (A), the horizontal movement mechanism 205 causes the six workpiece transfer rods 201 to enter between the five workpiece support rods 106 of the heating furnace unit in the X direction. Move horizontally.

  Thereafter, as shown in FIG. 9B, the workpieces W1 and W2 placed on the workpiece conveying rod 201 are moved onto the workpiece supporting rod 106 by moving the six workpiece conveying rods 201 downward by the vertical movement mechanism 207. Move to. Then, as shown in FIG. 9C, the work transport bar 201 is further moved downward by the vertical movement mechanism 207, whereby the work transport bar 201 is separated from the work W1, W2, and the work W1, W2 and the support base 111A. , 111B, 111C. Thereafter, as shown in FIG. 8, the work transfer rod 201 is extracted from the heating furnace unit by the horizontal movement mechanism 205.

  In this way, the workpieces W1 and W2 can be put into an arbitrary heating furnace unit of the multistage heating furnace 100 using the workpiece conveying rod 201. As described above, the heating furnace unit is configured to have a small vertical dimension, and the workpieces W1 and W2 are stored in a narrow space between the workpiece support bar 106 and the upper lower heaters 101A and 101B. The workpiece transfer machine 200A is suitable for loading the workpieces W1 and W2 into such a narrow space by using the workpiece transfer bar 201.

  Similarly, for the workpiece transfer machine 200B, the workpieces W1 and W2 can be discharged from any heating furnace unit of the multistage heating furnace 100 using the workpiece transfer bar 201.

  Moreover, since the workpiece conveyance rod 201 is inserted into a high-temperature heating furnace unit, it tends to be thermally deformed. If the workpiece conveying rod 201 is thermally deformed, the workpieces W1 and W2 may be displaced or dropped. Therefore, similarly to the above-described support pipes 104A, 104B, and 104C, thermal deformation can be suppressed by flowing cooling water through the work conveying rod 201.

  Even in this case, as shown in FIG. 10, the work conveying rod 201 is inserted with a gap in the outer pipe 112 and the outer pipe 112 whose one end is closed by the stopper 114 and the other end is opened. And an inner pipe 113 having both ends opened. Then, the cooling water is injected into the inner pipe 113 from the opening of the inner pipe 113 by a cooling water injection means such as a water tap. The cooling water injected into the inner pipe 113 hits the plug 114 and flows in the reverse direction through the gap and is collected. By comprising in this way, the path | route of a cooling water is doubled, the high cooling effect is acquired, and piping of a cooling water can be saved.

  In addition, the number of the work conveyance rods 201 is determined according to the number of the work support rods 106 of the heating furnace unit, and is preferably one more than the number of the work support rods 106.

100 Multi-stage heating furnaces 100-1 to 100-10 Heating furnace units 101A, 101B Lower heaters 102A, 102B Upper heaters 103A, 103B Thermal insulation materials 104A, 104B, 104C Support pipes 105A, 105B, 105C Base 106 Work support rod 107 Door 108 Discharge door 109A, 109B, 110A, 110B Electrodes 111A, 111B, 111C Support base 112 Outer pipe 113 Inner pipe 114 Plug part 200A, 200B Work transfer machine 201 Work transfer bar 202 Guide bar 203A, 203B Work restriction tool 204 Horizontal rail 205 Horizontal movement mechanism 206 Vertical rail 207 Vertical movement mechanism

Claims (3)

In a multi-stage heating furnace in which a plurality of heating furnace units are stacked vertically,
Each heating furnace unit has a plate-like upper and lower heaters stacked with a heat insulating material sandwiched in the vertical direction, and
A first support pipe arranged to extend horizontally on one end of the upper heater;
A second support pipe disposed horizontally extending on the other end of the upper heater;
A plurality of work support rods spanned on the first and second support pipes,
The multi-stage type is characterized in that the back surface of the work supported by the plurality of work support rods is opposed to the upper heater, and the upper surface of the work is arranged to face the lower heater of the adjacent heating furnace unit. heating furnace. Each heating furnace unit is attached with a predetermined interval on the first support pipe, and a plurality of first support bases having recesses formed on the upper surface;
A plurality of second support bases mounted on the second support pipe with predetermined intervals and having recesses formed on the upper surface;
The multistage heating furnace according to claim 1, wherein the work support bar is fitted into the corresponding recesses of the first and second support bases.   The multi-stage heating furnace according to claim 1 or 2, wherein the upper heater and the lower heater are constituted by a far infrared heater.

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