JP2016173186A - Heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a heating time for making a workpiece into a predetermined temperature to be shortened while suppressing heat quantity of a heater, and even in this case, enable the shape of a heating furnace to be downsized.SOLUTION: A heating furnace includes: an installation part 12 that is installed in a furnace chamber 11 surrounded by a furnace wall 10, and can contact with a workpiece 2 to be heated and install the workpiece 2, and/or a conveyance body 13 capable of contacting with the workpiece 2 and conveying the workpiece 2 in one direction; and a heater 24 that is installed in the furnace chamber 11, and heats at least a part of workpiece 2 and/or the conveyance body 13 together with air in the furnace chamber 11. The installation part 12 comprises the heater 24.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heating furnace configured to heat a workpiece placed on a placing portion in a furnace chamber surrounded by a furnace wall.

  Conventionally, there is a heating furnace described in Patent Document 1 below. According to this publication, the heating furnace is installed in a furnace chamber surrounded by a furnace wall, and is placed in the furnace chamber on which a workpiece to be heated can be placed, and the furnace chamber. And a heater for heating the workpiece together with the air.

  When a workpiece is heated using the heating furnace, first, the workpiece is placed on the placement portion outside the furnace wall. Next, the workpiece is inserted into the furnace chamber together with the placing portion and heated by a heater. Next, the heated workpiece is taken out of the furnace wall together with the above-described placement section, and then hot pressed.

JP 2008-296237 A

  By the way, in the said prior art, while a mounting part and a heater are mutually separate bodies, a workpiece | work, a mounting part, and a heater are installed up and down with a space.

  For this reason, the heat transfer efficiency from the heater to the work tends to be lowered because there is a space between the work and the mounting portion and the heater, and thus the work is heated to a predetermined temperature. The heating time may be unnecessarily prolonged.

  In addition, the height of the furnace chamber is increased by the amount of the space set, and accordingly, the outer shape of the heating furnace may become excessive. Moreover, as described above, since there is a possibility that the heating time for bringing the workpiece to a predetermined temperature may become long, if it is a heating furnace that is heated by a heater while moving the workpiece at a predetermined speed in the furnace chamber, As described above, the length of the furnace chamber in the moving direction of the work is inevitably increased due to the longer heating time of the work, and thus the outer shape of the heating furnace may be further increased.

  The present invention has been made by paying attention to the above-described circumstances, and an object of the present invention is to reduce the heating time for bringing the workpiece to a predetermined temperature even while suppressing the heat quantity of the heater. Even in this case, the outer shape of the heating furnace can be made smaller.

The invention of claim 1 is placed in a furnace chamber 11 surrounded by a furnace wall 10 as illustrated in all the drawings, and is placed on the work 2 to be heated so that the work 2 can be placed. 12 and / or a transport body 13 that can transport the work 2 in one direction in contact with the work 2 and a heater 24 that is installed in the furnace chamber 11 and heats the work 2 together with the air in the furnace chamber 11. In the heating furnace provided,
A heating furnace characterized in that at least a part of the placement section 12 and / or the transport body 13 is configured by the heater 24.

  As shown in FIG. 3, the invention of claim 2 is a plurality of feed rollers which are arranged at a predetermined interval in the one direction and are supported by the furnace wall 10 so as to rotate around the axis 20 thereof. 21. The transport body 13 is configured by 21, and the feed roller 21 is disposed so that the axis 20 thereof is inclined with respect to the one direction in a plan view (FIG. 3). It is a heating furnace.

  In addition, in this section, the reference numerals and drawing numbers appended to the above terms are not intended to limit the technical scope of the present invention to the “Example” section and the contents of the drawings described later.

  The effects of the present invention are as follows.

The invention according to claim 1 is installed in a furnace chamber surrounded by a furnace wall, is in contact with a work to be heated and is capable of placing the work and / or is in contact with the work in one direction. In a heating furnace equipped with a transport body that can be transported to and a heater that is installed in the furnace chamber and heats the workpiece together with air in the furnace chamber,
At least a part of the placement section and / or the transport body is configured by the heater.

  For this reason, by forming at least a part of the mounting portion and / or the transport body with the heater, the workpiece is directly heated by the heater in contact with the workpiece, and heat transfer efficiency from the heater to the workpiece is increased. Will improve. Therefore, even when the amount of heat of the heater is suppressed, the heating time for bringing the workpiece to a predetermined temperature can be shortened, and the workability of the workpiece heating operation is improved.

  In addition, as described above, at least a part of the mounting portion that can contact the workpiece and place the workpiece and / or the workpiece that can contact the workpiece and transport the workpiece in one direction is itself a heater. In addition, since the workpiece and the mounting portion and / or the transport body are in contact with each other and there is no space between them, the workpiece, the mounting portion and / or the transport body, and the heater as a whole are in the vertical direction. Can be arranged compactly. Therefore, even when the heating time of the workpiece can be shortened as described above, the height of the heating furnace can be lowered and the outer shape thereof can be made smaller.

  Also, if the heating chamber is heated by a heater while moving the workpiece at a predetermined speed in the furnace chamber, the furnace chamber length in the moving direction of the workpiece is shortened as much as the heating time of the workpiece is shortened as described above. Therefore, the outer shape of the heating furnace can be further reduced.

  According to a second aspect of the present invention, the transport body is constituted by a plurality of feed rollers which are arranged at a predetermined interval in the one direction and are supported by the furnace wall so as to rotate around the axis thereof. The feed roller is arranged such that its axis is inclined with respect to the one direction.

  For this reason, in the plan view, the contact area of the feed roller with respect to the work is increased as compared with the case where the feed roller is arranged so that its axis is perpendicular to the one direction. Therefore, the heating time for making the said workpiece | work the predetermined temperature can be shortened by that much, and the workability | operativity about the heating operation | work of a workpiece | work improves more.

1 is a side sectional view of a heating furnace according to Example 1. FIG. 1 is a partial perspective view of a heating furnace according to Example 1. FIG. Example 2 is shown and is a plan view of a heating furnace.

  With respect to the heating furnace of the present invention, it is possible to reduce the heating time for bringing the workpiece to a predetermined temperature even while suppressing the amount of heat of the heater, and even in this case, the outer shape of the heating furnace is In order to realize the object of enabling a further reduction in size, an embodiment for carrying out the present invention is as follows.

  In other words, the heating furnace is installed in a furnace chamber surrounded by the furnace wall, is in contact with the workpiece to be heated and can place the workpiece and / or the workpiece in one direction. A transport body that can be transported, and a heater that is installed in the furnace chamber and heats the workpiece together with the air in the furnace chamber. At least a part of the placement section and / or the transport body is constituted by the heater.

  In order to describe the present invention in more detail, the first embodiment will be described with reference to FIGS.

  1 and 2, reference numeral 1 denotes a heating device, for example, for heating the workpiece 2 when hot pressing the workpiece 2 that is a sheet metal material of a vehicle body of a vehicle. For convenience of explanation, the direction of the arrow Fr is assumed to be the front, and the left-right direction described below refers to the lateral direction toward the front.

  The heating device 1 includes a heating furnace 5 that heats the workpiece 2 prior to press working, a feed conveyor 6 that feeds the workpiece 2 into the heating furnace 5, and the workpiece 2 heated in the heating furnace 5 from the heating furnace 5. And a delivery conveyor 7 for feeding to a pressing machine (not shown).

  The heating furnace 5 includes a furnace wall 10 made of a heat insulating material that constitutes an outer shell thereof, and a placing portion 12 that is provided in the furnace chamber 11 inside the furnace wall 10 and places the workpiece 2 thereon. The mounting portion 12 also serves as the transport body 13 as will be described later.

  The furnace wall 10 is installed on the left and right vertical walls 15, 15, the lower wall 16 provided to extend to the lower ends of the left and right vertical walls 15, 15, and the upper ends of the left and right vertical walls 15, 15. And an upper surface wall 17.

  The placement section 12 contacts the workpiece 2 fed into the furnace chamber 11 from the feeding conveyor 6, places the workpiece 2, and transports a carrier 13 that can be transported in one direction toward the feeding conveyor 7. Combined use. The placement unit 12 and the transport body 13 have feed rollers 21 having a plurality of (four) shafts 20 extending in the left-right direction and arranged forward at a predetermined interval. These feed rollers 21 are supported at both ends so as to be rotatable about the axis 20 with respect to the left and right vertical walls 15, 15, and are respectively the same by actuators such as an electric motor (not shown) provided outside the furnace wall 10. It is rotated A in the direction.

  The feed roller 21 itself is composed of a heater 24. The heater 24 is a metal rotary shaft 25 positioned on the shaft 20, a cylindrical heat conductive material 26 fitted and fixed to the rotary shaft 25, and the heat conductive material 26 embedded in the heat conductive material 26. A coil-shaped heater wire 27 wound around a rotary shaft 25 and a metal cylindrical body 28 that is externally fixed to the heat conducting material 26 on the shaft 20 and is excellent in heat conduction. The heat conducting material 26 has electrical insulation, and positions the heater wire 27 at a predetermined position on the axis 20. Further, the heat conducting material 26 has a heat capacity that retains a large amount of heat generated by energizing the heater wire 27. Therefore, even after the power supply to the heater wire 27 is stopped, the heat conducting material 26 is kept at a high temperature for a predetermined period. Retained. The heater wire 27 is electrically connected to the power supply side through a rotary connector (not shown) outside the furnace wall 10. The heat conducting material 26 may not be provided.

  The transport body 13 includes a plurality of (three) rollers 31 that extend in the left-right direction and come into contact (including pressure contact) with the upper surface of the work 2 placed on the feed rollers 21. These rollers 31 are arranged at a predetermined interval toward the front, and are arranged at the center of the adjacent both feed rollers 21 and 21. Each roller 31 is supported at both ends so as to be freely rotatable B with respect to the left and right vertical walls 15, 15. Each roller 31 has the same configuration and the same shape and size as the heater 24.

  And if each said feed roller 21 rotates A, the said workpiece | work 2 mounted in these each feed roller 21 will be conveyed at the predetermined speed toward the front, At this time, each said roller 31 will be as above. It is rotated B along with the upper surface of the work 2 to be conveyed. At the same time, the workpiece 2 is heated from below by the heaters 24 constituting the feed rollers 21 and is heated from above by the heaters 24 constituting the rollers 31. Each of the feed rollers 21 and each of the rollers 31 also heats the air in the furnace chamber 11 by the respective heaters 24 to raise the temperature around the work 2, and this also causes the work 2 to be entirely removed from the surroundings. Heated.

  The transport body 13 may be provided with a plurality of non-rotating feed bodies that repeat the reciprocating movement in the front-rear direction and intermittently feed the work 2 forward. The placement unit 12 may be a tray that can be inserted into and removed from the furnace wall 10 in a state where the workpiece 2 is placed, and is a mounting table fixed to the furnace wall 10. In this case, at least a part of the tray or the mounting table may be the heater 24. When the work 2 is a non-conductor, the heater 24 may have a heater wire 27 on the surface thereof.

  Moreover, the said conveyance body 13 rotates each said roller 31 with an actuator, respectively, and may convey the said workpiece | work 2 ahead with the frictional force. In this case, the placement unit 12 may be a simple sliding body that is not the heater 24, such as a guide rail that slides the workpiece 2 forward. The roller 31 may not be provided.

  According to the above configuration, since at least a part of the mounting portion 12 and / or the transport body 13 is configured by the heater 24, the workpiece 2 is directly heated by the heater 24 in contact with the workpiece 2, and the heater 24 The heat transfer efficiency to the work 2 is improved. Therefore, even when the amount of heat of the heater 24 is suppressed, the heating time for bringing the workpiece 2 to a predetermined temperature can be shortened, and the workability for the heating operation of the workpiece 2 is improved.

  Further, as described above, at least a part of the mounting portion 12 that can contact the workpiece 2 and can place the workpiece 2 and / or the carrier 13 that contacts the workpiece 2 and can transport the workpiece 2 in one direction. Is the heater 24 itself, and since the work 2 and the placement unit 12 and / or the transport body 13 are in contact with each other and there is no space between them, the work 2, the placement unit 12 and / or Or the conveyance body 13 and the heater 24 can be arrange | positioned compactly in the up-down direction as a whole. Therefore, even when the heating time of the workpiece 2 can be shortened as described above, the height of the heating furnace 5 can be lowered and the outer shape thereof can be made smaller.

  Further, as described in the above embodiment, in the furnace chamber 11, when the heating furnace 5 is heated by the heater 24 while moving the workpiece 2 at a predetermined speed by the transport body 13, the workpiece 2 as described above. As the heating time is shortened, the length of the furnace chamber 11 in the moving direction of the workpiece 2 can be shortened, so that the outer shape of the heating furnace 5 can be further reduced.

  FIG. 3 below shows the second embodiment. The second embodiment is common in many respects to the configuration and operational effects of the first embodiment. Therefore, regarding these common items, common reference numerals are attached to the drawings, and redundant description thereof is omitted, and different points are mainly described. In addition, the configuration of each part in these embodiments may be variously combined in light of the object and operational effects of the present invention.

  In order to describe the present invention in more detail, the second embodiment will be described with reference to FIG.

  In FIG. 3, each feed roller 21 included in the transport body 13 is inclined at the same predetermined angle θ with respect to the front in which the axis 20 is in one direction in a plan view of the heating furnace 5 (FIG. 3). Arranged so that.

  Therefore, in the plan view of the heating furnace 5 (FIG. 3), the feed roller 21 is in contact with the workpiece 2 as compared with the case where the feed roller 21 is arranged so that the axis 20 is orthogonal to the one direction. Increases area. Accordingly, the heating time for bringing the workpiece 2 to the predetermined temperature can be shortened accordingly, and the workability of the heating operation of the workpiece 2 is further improved.

  Here, when the feed rollers 21 rotate A, the work 2 on the feed rollers 21 rotates in the direction perpendicular to the axis 20 of the feed rollers 21 per unit time. Try to move the distance L according to the number. In this case, the distance L is divided into a forward movement portion L1 and a lateral movement portion L2, and the side movement portion L2 is prevented from occurring, and the workpiece 2 is moved straight forward. It is structured as follows.

  That is, first, a thread groove 34 that is a right-hand thread is formed on the outer peripheral surface of each feed roller 21. As a result, when the feed roller 21 rotates counterclockwise A, the work 2 is engaged with a minute protrusion on the outer surface of the work 2 while sliding relative to the opening edge of the thread groove 34. The distance S corresponding to the number of rotations per unit time of the feed roller 21 can be moved in the direction of the axial center 20 of the feed roller 21. In this case, the distance S is divided into a forward movement portion S1 and a lateral movement portion S2. Of these, the lateral movement portion S2 of the screw groove 34 is adjusted so as to match the forward movement portion L1 by the feed roller 21. Shape and pitch are set. As a result, the workpiece 2 on each of the feed rollers 21 is moved straight forward.

  Second, instead of forming the thread groove 34 on each feed roller 21, the rollers 31 are inclined in the direction opposite to the feed roller 21 as shown by a two-dot chain line in FIG. The workpiece 2 may be rotated B by an actuator, thereby moving the workpiece 2 straight forward.

  Thirdly, although not shown, a guide may be provided for sliding the side edge of the work 2 forward so that the work 2 moves straight forward.

DESCRIPTION OF SYMBOLS 1 Heating device 2 Work 5 Heating furnace 10 Furnace wall 11 Furnace chamber 12 Placement part 13 Conveyance body 20 Axis center 21 Feed roller 24 Heater 25 Rotating shaft 26 Heat conduction material 27 Heater wire 28 Cylindrical body 31 Roller 34 Screw groove A Rotation B Rotation L Distance L1 Forward movement L2 Lateral movement S Distance S1 Forward movement S2 Lateral movement θ Predetermined angle

Claims (2)

Placed in a furnace chamber surrounded by the furnace wall, a placing part that can place the workpiece in contact with the workpiece to be heated and / or a carrier that can convey the workpiece in one direction in contact with the workpiece And a heating furnace provided with a heater that is installed in the furnace chamber and heats the workpiece together with air in the furnace chamber,
A heating furnace characterized in that at least a part of the placement section and / or the transport body is configured by the heater.   The transport body is composed of a plurality of feed rollers arranged on the one direction at a predetermined interval and supported on the furnace wall so as to rotate around the axis thereof. The heating furnace according to claim 1, wherein the axial center is disposed so as to be inclined with respect to the one direction.

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