JP2014077570A - Two-stage type heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce manufacturing cost of a two-stage type heating furnace.SOLUTION: A two-stage type heating furnace 10 includes a lower part heater 2 disposed on a base 1, a first workpiece supporter 3 disposed on the lower part heater 2, a second workpiece supporter 4 disposed on the first workpiece supporter 3, and an upper part heater 6 disposed on the second workpiece supporter 4 and attached to an upper wall 5. The second workpiece supporter 4 includes a pair of workpiece support pipes 4a, 4a arranged to extend straight in the horizontal direction (X direction) and held telescopically in the X direction, and a plurality of second workpiece support bars 4b extended between the workpiece support pipes 4a, 4a with a predetermined distance provided therebetween. The workpiece support pipes 4a, 4b have a hollow structure in which cooling water is injected from an injection hole 8 at one end and discharged from a discharge hole 9 at the other end.

Description

  The present invention relates to a two-stage heating furnace capable of simultaneously heating two workpieces.

  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, if it is a two-stage heating furnace, a heater is provided with one set of a lower heater and an upper heater in each stage, and two sets are required in total.

JP 2010-44875 A

  However, the conventional two-stage heating furnace has a problem of high cost because a two-type heater is required. Accordingly, an object of the present invention is to reduce the cost of the two-stage heating furnace.

  In view of the above-described problems, the two-stage heating furnace of the present invention includes a lower heater, a first work support portion disposed on the lower heater, and a first work support portion disposed in the horizontal direction. A pair of work support pipes that extend in the horizontal direction and are held so as to be stretchable in the horizontal direction, and a plurality of work support bars that are spanned between the pair of work support pipes at a predetermined interval. And a top heater disposed on the second work support part, and configured to allow cooling water to flow through the work support pipe.

  According to the present invention, by providing the second work support part in the second stage, a two-stage heating furnace can be formed only by a set of heaters of the lower heater and the upper heater, so that the manufacturing cost can be reduced. .

  In particular, in the second work support portion, a pair of work support pipes and a plurality of work support rods form a so-called scissors so that the radiant heat of the lower heater and the upper heater can be mutually exchanged from the clearance between the scissors. Uniform heating is possible by passing it through. In addition, since the work support pipe is held so as to be stretchable in the horizontal direction, there is an effect that the work support pipe is not deformed by thermal expansion due to heating.

  Moreover, since it is comprised so that cooling water may flow in a workpiece | work support pipe, the thermal deformation can be prevented.

It is a front view of the two-stage heating furnace in the embodiment of the present invention. It is a top view of the 1st work support part which constitutes the 1st stage of a 2 stage type heating furnace. It is a top view of the 2nd workpiece support part which constitutes the 2nd stage of a 2 stage type heating furnace. It is a figure which shows the structure of the rotation stopper of a workpiece | work support pipe. It is a top view of the workpiece conveyance machine for heating furnaces. It is sectional drawing in the XX line of FIG. 5, YY line, and ZZ line. It is a figure explaining the chuck | zipper operation | movement of the workpiece conveyance machine for heating furnaces. It is a front view of the workpiece conveyance machine for heating furnaces. It is a figure explaining the conveyance operation of the workpiece conveyance machine for heating furnaces.

<Configuration of two-stage heating furnace>
FIG. 1 is a schematic front view of a two-stage heating furnace 10 according to an embodiment of the present invention. FIG. 2 is a plan view of the first work support portion 3 constituting the first stage of the two-stage heating furnace 10. FIG. 3 is a plan view of the second work support portion 4 constituting the second stage of the two-stage heating furnace 10.

As shown in FIG. 1, the two-stage heating furnace 10 includes a lower heater 2 disposed on a base 1,
The first work support portion 3 disposed on the lower heater 2, the second work support portion 4 disposed on the first work support portion 3, and the second work support portion 4 are disposed on the top. An upper heater 6 attached to the wall 5 is included.

  The workpiece W1 is disposed on the first workpiece support portion 3 at the first stage, and the workpiece W2 is disposed on the second workpiece support portion 4 at the second stage. The workpieces W1 and W2 are heated while being sandwiched between the lower heater 2 and the upper heater 6. The lower heater 2 and the upper heater 6 are preferably constituted by far infrared heaters. The workpieces W1 and W2 are, for example, vehicle parts and are formed of a steel plate having a predetermined shape.

  As shown in FIG. 2, the first work support portion 3 includes a plurality of (for example, six) first work support bars 3 a that are disposed on the lower heater 2 and extend in the horizontal direction (Y direction). Consists of. In this example, the lower heater 2 is divided into three blocks, and the two first work support bars 3a are arranged on each block. However, whether the blocks are divided or not is arbitrary. is there.

  As shown in FIG. 3, the second work support portion 4 is arranged to extend in a straight line in the horizontal direction (X direction), and a pair of work support pipes 4 a that are held to expand and contract in the horizontal direction (X direction). , 4a and a plurality of (for example, six) second work support bars 4b spanned at a predetermined interval between the pair of work support pipes 4a, 4a.

  A base 4c is attached so as to protrude inside the pair of work support pipes 4a, 4a, and both ends of the second work support bar 4b are placed on the base 4c. Since the pair of workpiece support pipes 4a and 4a and the six second workpiece support rods 4b form so-called scissors, the radiant heat of the lower heater 2 and the upper heater 6 is passed through the clearance between the scissors. Can be heated to a uniform temperature. In this example, the upper heater 6 is divided into three blocks corresponding to the lower heater 2, and two second work support bars 4a are arranged on each block. Whether or not the number of block divisions is arbitrary.

  Further, the ends of the pair of work support pipes 4 a and 4 a protrude outside through holes 12 formed in the side wall 11 of the two-stage heating furnace 10. In other words, the pair of workpiece support pipes 4a and 4a can be freely expanded and contracted in the X direction by thermal expansion due to heating, and thus is not deformed.

  However, the workpiece support pipe 4a may rotate around the longitudinal direction as it is. Therefore, it is preferable to attach a rotation stopper 7 for preventing rotation to one end of the work support pipe 4a.

4A is a front view of the rotation stopper 7, and FIG. 4B is a left side view of FIG. 4A.
As shown in the figure, one end of the work support pipe 4 a protrudes to the outside through a hole 12 formed in the side wall 11 of the two-stage heating furnace 10. A ring-shaped guide member 7a is attached to the outer surface of the side wall 11, and the work support pipe 4a is passed through the guide member 7a.

  The fixed plate 7b is fixed to the end portion of the protruding work support pipe 4a. The upper part of the fixing plate 7b is cut out to form a recess 7c. One end is attached to the outer surface of the side wall 11, and the other end is attached to a fixing rod 7d inserted into the recess 7c of the fixing plate 7b. Thereby, when the work support pipe 4a tries to rotate, the side wall of the concave portion 7c of the fixed plate 7b hits the work support pipe 4a, thereby preventing the work support pipe 4a from rotating.

  As shown in FIGS. 3 and 4, the pair of work support pipes 4 a and 4 a have a hollow structure, and cooling water is injected from the injection hole 8 at one end and the discharge hole 9 at the other end. The cooling water is configured to be discharged from. Thereby, a pair of workpiece | work support pipe 4a, 4a is cooled, and the thermal deformation is prevented.

  In this case, the workpiece support pipe 4a passes through the hole 12 formed in the side wall 11 of the two-stage heating furnace 10 and the ring portion of the guide member 7a, but can slide in the horizontal direction (X direction). Therefore, deformation due to thermal expansion is prevented.

  Note that the number and interval of the first workpiece support rod 3a of the first workpiece support portion 3 and the second workpiece support rod 4b of the second workpiece support portion 4 are the number of workpieces W1 and W2 to be input, It can change suitably according to a dimension.

<Configuration of work transfer machine for heating furnace>
Next, the heating furnace work transfer machine 20 will be described with reference to FIGS. FIG. 5 is a plan view of the heating furnace work transfer machine 20. 6A is a cross-sectional view taken along line XX in FIG. 5, FIG. 6B is a cross-sectional view taken along line YY in FIG. 5, and FIG. 6C is a cross-sectional view taken along line ZZ in FIG. is there.

The heating furnace work transfer machine 20 has a frame 22 mounted on a base 21 so as to be movable in the vertical direction (Z direction) and the horizontal direction (X direction), and a rack attached to the frame 22. The first work chuck plates 36a and 36b and the second work chuck plates 36c and 36d are opened and closed using an and pinion mechanism.
The rack and pinion mechanism converts the linear motion of the rack into the rotational motion of a pinion (gear).

  Unlike the one using the cylinder mechanism, the heating furnace work transfer machine 20 has excellent heat resistance, and the chucking operation of the workpieces W1 and W2 in the heating furnace heated to a high temperature above the austenitizing temperature. Unchuck operation can be performed.

  Hereinafter, a detailed configuration of the heating furnace work transfer machine 20 will be described. The arm 23 that is long in the X direction is driven to move linearly in the X direction by a motor 24 attached to the frame 22. The arm support bar 25 is stretched in the Y direction of the frame 22 so as to cross the arm 23 in order to support the arm 23 from below. In addition, a guide member 26 is attached to the arm support bar 25 to guide the arm 23 in the X direction.

  Inside the arm 23, a first rack 27 and a second rack 28 are attached at a predetermined interval in the X direction. The first rack 27 and the second rack 28 are formed by carving identical teeth at the same pitch on one surface of a flat plate.

  A first gear 29 is engaged with the first rack 27, and a second gear 30 is engaged with the second rack 28.

  One end of the first rotation shaft 31 is coupled to the rotation center of the first gear 29, and the other end is rotatably connected to the frame 22. As a result, when the arm 23 moves in the X direction, the first rotating shaft 31 rotates forward together with the first gear 29.

  One end of the second rotating shaft 32 is coupled to the rotation center of the second gear 30 and the other end is rotatably connected to the frame 22. As a result, when the arm 23 moves in the X direction, the second rotating shaft 32 rotates forward together with the second gear 30.

  A third gear 33 is attached to the second rotating shaft 32 adjacent to the second gear 30 in the Y direction. The third gear 33 rotates forward with the rotation of the second rotation shaft 32.

  The fourth gear 34 meshes with the third gear 33. One end of the third rotation shaft 35 is coupled to the rotation center of the fourth gear 34, and the other end is rotatably connected to the frame 22. Thereby, the 3rd rotating shaft 35 reversely rotates. In this case, the first to fourth gears 29, 30, 33, and 34 are formed by cutting the same number of teeth of the same shape at the same pitch.

  The first work chuck plates 36a and 36b are attached to the first rotary shaft 31 at a predetermined interval according to the size of the work W, and the second work chuck plates 36c and 36d are attached to the third rotary shaft 35 on the work W. It is attached at a predetermined interval according to the size. As shown in FIG. 7, the first and second work chuck plates 36 a to 36 d have a claw portion 37 that hooks a plate-like work W on the tip.

  When the arm 23 moves in the X direction (left direction), the first rotating shaft 31 rotates forward (counterclockwise), and the first work chuck plates 36a and 36b also rotate forward. At this time, the third rotating shaft 35 rotates in the reverse direction (clockwise), and the second work chuck plates 36c and 36d also rotate in the reverse direction. As a result, as shown in FIG. 7A, the first and second workpiece chuck plates 36 to 36d are closed, and the workpiece W is chucked (held).

  When the arm 23 moves in the X direction (right direction), the first rotating shaft 31 rotates in the reverse direction, and the first work chuck plates 36a and 36b also rotate in the reverse direction. At this time, the third rotating shaft 35 rotates forward, and the second work chuck plates 36c and 36d also rotate forward. As a result, as shown in FIG. 7B, the first and second work chuck plates 36 to 36d are opened, and the work W is released.

  As shown in FIG. 8, a work pushing tool 38 for pushing out a work placed in the heating furnace is attached to the front surface of the frame 22 in the moving direction. The workpiece pushing tool 38 has a protruding portion that protrudes in the horizontal direction (X direction) and contacts the side surface of the workpiece.

  The function of the workpiece pushing tool 38 will be described by taking the loading of the workpiece into the two-stage heating furnace 10 as an example. In this case, it is assumed that two workpieces can be put on the first workpiece support portion 3 of the two-stage heating furnace 10.

First, as shown in FIG. 9A, two workpieces W1 and W2 are put on the first workpiece support 3 and heated. When the heating of the workpiece W1 that has been input first is completed,
As shown in FIG. 9 (b), the workpiece W1 is a two-stage heating furnace by the horizontal movement, vertical movement, and chucking operation of the heating furnace work transfer machine 20 arranged at the discharge port of the two-stage heating furnace 10. It is discharged from 10 outlets.

  Next, as shown in FIG. 9C, after the vertical position of the heating furnace work transfer machine 20 is adjusted in advance by vertical movement, the work W3 to be loaded next is chucked (held). It moves horizontally from the charging port of the two-stage heating furnace 10 into the furnace. At this time, the workpiece pushing tool 38 comes into contact with the side surface of the workpiece W2, so that the workpiece W2 is pushed out on the first workpiece support portion 3 to a predetermined heating position (a position where the discharged workpiece W1 was present).

Next, as shown in FIG. 9D, the heating furnace work transfer machine 20 opens the transferred work W <b> 3 and moves it onto the first work support unit 3. After that, as shown in FIG. 9 (e), the heating furnace work transfer machine 20 with the work W3 opened rises in the vertical direction and horizontally moves from the charging port to the original position. In this way, by only attaching the workpiece pusher 38, it is possible to simultaneously introduce a new workpiece and move the workpiece previously introduced into the furnace with one heating furnace workpiece transfer machine 20. . The same applies to the case where a workpiece is put into the second workpiece support portion 4 of the two-stage heating furnace 10.

  Further, the heating furnace work transfer machine 20 is not limited to the two-stage heating furnace 10 and can be applied to loading and discharging of workpieces of a single-stage heating furnace and a multi-stage heating furnace.

Reference Signs List 1 base 2 lower heater 3 first work support 3a first work support bar 4 second work support 4a work support pipe 4b second work support 4c base 5 upper wall 6 upper heater 7 rotation stop 7a Guide member 7b Fixing plate 7 7c Recess 7d Fixing bar 8 Injection hole 9 Discharge hole 10 Two-stage heating furnace 20 Heating furnace work transfer machine 21 Base 22 Frame 23 Arm 24 Motor 24 25 Arm support bar 26 Guide member 27 1st rack 28 2nd rack 29 1st gear 30 2nd gear 31 1st rotating shaft 32 2nd rotating shaft 33 3rd gear 34 4th gear 35 3rd rotating shaft 36a, 36b 2nd 1 Work chuck plate 36c, 36d Second work chuck plate 37 Claw portion 38 Work pusher

Claims (2)

A lower heater,
A first work support disposed on the lower heater;
A pair of work support pipes disposed on the first work support portion, extending in the horizontal direction, and held in a horizontally stretchable manner, and a pair of work support pipes are hung at a predetermined interval. A plurality of workpiece support rods passed, a second workpiece support portion comprising:
And an upper heater disposed on the second work support section, and configured to allow cooling water to flow through the work support pipe.   The two-stage heating furnace according to claim 1, wherein the upper heater and the lower heater are configured by a far infrared heater.

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