JPH0532529Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vertical type workpiece heating device having a workpiece inlet at the upper end and a workpiece outlet at the lower end.
The present invention can be used, for example, in a workpiece heating device that heats hot forged materials, heat-treated materials, etc. by induction heating.

[Prior Art] As a workpiece heating device for heating a workpiece, for example, a hot forging material, a vertical type workpiece heating device is conventionally known. This vertical workpiece heating device is
It has a workpiece inlet formed at the upper end, a workpiece outlet formed at the lower end, and a workpiece passage extending vertically and connecting the workpiece inlet and the workpiece outlet.

When heating the hot forged material, a large number of hot forged materials are inserted in series from the workpiece entrance into the workpiece passageway with the workpiece outlet closed to fill the workpiece passageway. In this state, the hot forged material is heated. Then, one hot forged material is discharged from the work outlet. Then, one hot forged material inserted in series falls naturally, leaving a space for one hot forged material on the workpiece entrance side. Therefore, we have adopted the so-called Daruma Otoshi method, which utilizes the phenomenon of natural falling by inserting a single piece of hot forged material from the workpiece entrance.

In a conventional vertical workpiece heating device that uses the Daruma drop method, the hot forged material inserted at the upper end (workpiece entrance side) gradually falls naturally at the start, resulting in a temperature of about 1000℃ to 1200℃. It is heated to a certain temperature and discharged from the work outlet at the lower end.

Furthermore, horizontal type workpiece heating devices have also been known. In the case of this horizontal type workpiece heating device, a workpiece inlet and a workpiece outlet are formed at the lateral ends, and a workpiece passageway connecting the workpiece inlet and the workpiece outlet extends in the horizontal direction. In this horizontal type workpiece heating device, a feed roller is provided on the workpiece inlet side, and the hot forging materials are inserted one after another in series from the workpiece entrance into the workpiece passageway by rotational drive of the feed roller, and then The inserted hot forged material pushes the hot forged material in front to move it forward, and the heated hot forged material is sequentially discharged from the workpiece entrance.

[Problem to be solved by the invention] By the way, in the conventional vertical type workpiece heating device that adopts the Daruma Otoshi method described above, the hot forged material inserted into the workpiece exit side of the workpiece passageway at the time of start. is discharged from the workpiece outlet earlier than the hot-forged material inserted into the workpiece inlet side. Therefore, the hot-forged material inserted into the workpiece outlet side at the start is
The work was discharged from the outlet without being heated to the specified temperature, and was discarded as waste material. That is, at the start of the heating process, the temperature of the first few hot-forged materials was insufficient to raise the temperature, so they could not be hot-forged and had to be discarded as waste materials. Therefore, if the number of starts during a day of heating work is large, a considerable number of wasted materials are produced, which is disadvantageous in terms of productivity, economy, etc.

In addition, unlike vertical workpiece heating devices, conventional horizontal workpiece heating devices cannot allow the hot forged material to fall naturally within the workpiece passage, so as mentioned above, the rotational drive of the feed roller The hot forged materials are inserted one after another in series from the workpiece entrance into the workpiece passage, and the hot forged materials inserted later push the hot forged material in front to move forward and are discharged from the workpiece entrance. . Therefore, when the heating process is finished, the hot forged material always remains in the work passage, resulting in wasted material, which is disadvantageous in terms of productivity, economy, etc.

The present invention was devised in view of the above-mentioned circumstances, and its purpose is to provide a vertical workpiece heating device that improves the problem of producing waste material.

[Means for Solving the Problems] The vertical workpiece heating device of the present invention has a workpiece inlet formed at the upper end, a workpiece outlet formed at the lower end, and a workpiece passage extending in the vertical direction connecting the workpiece inlet and the workpiece outlet. a dummy member which is insertable into the work passage of the vertical heating furnace from the work outlet and which is vertically movable and has a work receiving surface; The device is characterized by comprising a drive mechanism that lowers the dummy member by a predetermined distance.

Add further explanation. The number of vertical heating furnaces may be one, or a plurality of vertical heating furnaces may be arranged in series in the vertical direction. The dummy member is provided so as to be insertable into the work passage of the vertical heating furnace and to be vertically movable. A work receiving surface for receiving a work is formed on the dummy member. The work receiving surface can be made of a material with excellent heat conductivity such as metal. The reason is as follows. In other words, when a workpiece is heated using the induction heating method,
The end face of the workpiece, where magnetic flux tends to concentrate, tends to become hot. Therefore, the purpose is to conduct heat through the workpiece receiving surface, which has excellent heat conductivity.

The dummy member can be shaped like a vertically long rod. In this case, the upper end of the rod-shaped dummy member becomes the workpiece receiving surface. The material of the dummy member is determined in consideration of the heating temperature, etc., and may be a fireproof material such as an alumina-based sintered body, a metal material such as an iron-based alloy, or the like. If the vertical heating furnace uses induction heating, refractory materials are desirable. This is because refractory materials are not substantially subjected to induction heating, which is advantageous in terms of reducing power consumption. The dummy member can also be formed of a base and a portion having a workpiece receiving surface that is replaceably connected to the base.

The drive mechanism has a function of lowering the dummy member by a predetermined distance. The drive mechanism may be a mechanism that lowers the dummy member by converting rotational motion into linear motion. As the drive mechanism, for example, a screw rod mechanism or a rack and pinion mechanism can be adopted. The drive mechanism may be a mechanism that continuously lowers the dummy member, or a mechanism that lowers the dummy member intermittently by a predetermined distance, for example, by the height of the workpiece. In this case, a pulse motor that rotates by the number of input pulses can be used as the drive mechanism. In a special example, the drive mechanism can be formed of a biasing member such as a spring that elastically suspends the dummy member, and a weight member that lowers the dummy member against the biasing force of the biasing member. may sequentially lower the dummy member as the weight of the weight member increases.

[Operation] At the start of the heating process, the dummy member is raised from the workpiece outlet, which is the lower end side of the vertical heating furnace, and inserted into the workpiece passageway. In this inserted state, the workpiece is inserted from the workpiece inlet on the upper end side of the vertical heating furnace, and the workpiece is received by the workpiece receiving surface of the dummy member. In this state, the workpiece is heated in a vertical heating furnace. Then, the drive mechanism is operated to gradually lower the dummy member within the work passage. If it is lowered in this way, a space will be created on the workpiece entrance side, so insert the workpiece into the workpiece passageway from the workpiece entrance.

Furthermore, as the dummy member continues to descend, the workpieces are successively inserted into the workpiece passageway from the workpiece entrance. Then, when the lowest workpiece received on the workpiece receiving surface of the dummy member reaches a predetermined temperature, the dummy member is discharged from the workpiece outlet and the workpiece received on the workpiece receiving surface is ejected. Take out the lowest workpiece from the workpiece outlet.

After the workpiece receiving member is taken out from the workpiece outlet as described above, a large number of workpieces are inserted in series in a vertical direction in a full state into the workpiece passageway.

Note that after taking out the dummy member from the workpiece outlet, until the heating process is restarted,
The dummy member remains removed from the workpiece outlet, and the workpieces are sequentially inserted from the workpiece inlet in the same manner as in the past, and the workpieces are ejected from the workpiece outlet using the Daruma-drop method that utilizes the natural falling phenomenon.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. This embodiment is used for induction heating of a material during hot forging.

(Configuration of Example) A frame 1 includes horizontal frames 2 and 3 and vertical frames 4, 5, and 6. A furnace holding column 8 is vertically installed on the horizontal frame 3 via a bracket 8a, and a vertical heating furnace 12 is attached to the furnace holding column 8 via an upper arm 9 and a lower arm 10. It is mounted so as to be swingable about the support 8 in the horizontal direction, that is, in the directions of arrows P1 and P2 shown in FIG. Lower arm 1 as shown in Figure 1
A rotating roller 15 is attached to the roller 0 via a fixture 14. The rotating roller 15 is attached to the horizontal frame 3
It rolls along the upper surface 3a of.

The vertical heating furnace 12 has a built-in induction coil. A workpiece inlet 17 is located at the upper end of the vertical heating furnace 12.
A workpiece outlet 18 is formed at the lower end, and a workpiece passageway 19 extending in the vertical direction connecting the workpiece inlet 17 and the workpiece outlet 18 is formed. A clamp device 20 is provided on the work outlet 18 side of the vertical heating furnace 12 . The clamp device 20 includes a pair of chucks 20a having V grooves facing each other and a cylinder (not shown) that opens and closes the pair of chucks 20a.

The drive mechanism 21 includes a screw groove 22, a motor 23, a lifting arm 24, and a guide rod 25.
The screw shaft 22 is mounted between the horizontal frames 2 and 3 with a holder 27,
It is rotatably held by 28. Screw shaft 2
A male threaded portion 30 is formed on the outer peripheral portion of the screw shaft 22 over substantially the entire length of the screw shaft 22. The motor 23 is
It is a geared motor with a brake and is fixed to the horizontal frame 2. The guide rod 25 is arranged parallel to the screw shaft 22 between the horizontal frames 2 and 3. The elevating arm 24 is formed with a female threaded portion 31 that is screwed into the male threaded portion 30 of the screw shaft 22 and is capable of being screwed forward and backward. A guide hole 32 is formed in the lifting arm 24, and the guide hole 32 is guided by the guide rod 25.
A dummy rod 35 as a dummy member is held upright on the mounting surface 24a of the lifting arm 24. The dummy rod 35 is made of ceramics as a fireproof material. The upper end of the dummy rod 35 serves as a workpiece receiving surface 35a. Here, motor 2
3 is driven, the screw shaft 22 rotates in its circumferential direction at a predetermined speed, and as a result, the elevating arm 24 is guided by the guide rod 25 and moves up and down, and as a result, the dummy rod 35 moves up and down.

Note that, as shown in FIG. 3, a support 38 is erected on the horizontal frame 3 of the frame 1.
8 holds an arm 39 located on the workpiece inlet 17 side of the vertical heating furnace 12. An air cylinder device 42 for supplying a workpiece is installed on the arm 39. A cover member 44 is attached to the piston rod 43 of the air cylinder device 42 for supply. This lid member 44 opens and closes the workpiece entrance 17. Further, the arm 39 is provided with a basket-shaped workpiece input tool 45. Further, an air cylinder device 46 for discharging the work is installed in the horizontal frame 3 of the frame 1, located on the work outlet 18 side and below the clamp device 20. A cover member 48 is attached to the piston rod 47 of the air cylinder device 46 for discharge. This lid member 48 opens and closes the work outlet 18.

(Function of the Example) Next, the function of the workpiece heating device of the present example will be explained along with how to use it. First, a round bar-shaped hot forged material W as a workpiece is cut out. Hot forged materials include carbon steel and case hardened steel.

At the start of the heating process, the workpiece input tool 45
Insert the hot forged material W into. Then, the air cylinder device 46 is operated to move the piston rod 4.
7 and the lid member 48 are moved back, thereby opening the work outlet 18. With the workpiece outlet 18 open in this manner, the motor 23 is driven to rotate the screw rod 22 in the circumferential direction, thereby raising the lifting arm 24 along the guide rod 25 and raising the dummy rod 35. . As a result, as shown in FIG. 2, almost the entire dummy rod 35 is inserted into the work passage 19 of the vertical heating furnace 12. and,
The air cylinder device 42 is operated to move the piston rod 43 and the lid member 44 back, and the workpiece entrance 1 is closed.
Open 7. Then, the first hot forged material W in the shape of a round bar as a workpiece that had been inserted into the workpiece input tool 45 is inserted from the workpiece entrance 17.
The hot forged material W is placed on the work receiving surface 35a of the dummy rod 35. Thereafter, the air cylinder device 42 is operated to advance the piston rod 43 and the lid member 44, thereby opening the workpiece inlet 17.
occlude.

In this state, the induction coil of the vertical heating furnace 12 is energized to continue heating, and the motor 23 is rotated little by little to continuously lower the dummy rod 35 little by little. When the dummy rod 35 is lowered by the height of one hot-forged material W, the air cylinder device 42 is operated to move the piston rod 43 and the lid member 44 back to open the workpiece inlet 17 again. Then, the second hot forged material W is inserted into the workpiece passageway 19 from the workpiece entrance 17. After inserting in this way, air cylinder device 4
2 to advance the piston rod 43 and the lid member 44 to close the workpiece inlet 17 again.

Then, heating is continued in this state. At this time,
Since the motor 23 is continuously driven to rotate, the dummy rod 35 is continuously lowered. Furthermore, as described above, when the dummy rod 35 descends by the height of one hot forged material W, the air cylinder device 42 is activated to retreat the piston rod 43 and the lid member 44 and open the workpiece inlet 17 again. . Then, the third hot forging material W, which had been inserted into the workpiece insertion tool 45, is inserted into the workpiece passageway 19 from the workpiece entrance 17. After inserting like this,
The air cylinder device 42 is operated to advance the piston rod 43 and the lid member 44 to close the workpiece entrance 1.
7 is occluded again.

In this way, by sequentially lowering the dummy rods 35, a large number of hot forged materials W, for example, 8 to 15 pieces, are inserted in series in the vertical direction into the workpiece passageway 19 of the vertical heating furnace 12, and the workpieces are passed through. The inside of the channel 19 is filled, and each hot forging material W is induction heated in the full state. During induction heating, the end faces of the hot forged material W, where magnetic flux tends to concentrate, tend to reach high temperatures, but since the end faces of the hot forged material W are in contact with each other, heat transfer between the end faces is expected. can.

Then, when the lowermost hot forged material W received by the workpiece receiving surface 35a of the dummy rod 35 reaches a predetermined temperature, the dummy rod 35 is pulled out from the workpiece outlet 18 as shown in FIG. . Then,
The lowest hot forged material W is discharged outward from the work outlet 18. At this time, the clamping device 20 is operated to clamp the second hot forged material W from the bottom with the chuck 20a to prevent the second hot forged material W from the bottom from being discharged from the work outlet 18.

As mentioned above, move the dummy rod 35 to the work outlet 18.
After the workpiece is removed from the workpiece, the air cylinder device 46 is operated to close the workpiece outlet 18 with the cover member 48 until the workpiece outlet 18 is next opened. After the dummy rod 35 is removed from the workpiece outlet 18, the workpiece passageway
There is no dummy rod 35 in the workpiece outlet 18, and therefore, the hot forging material W is sequentially taken out from the workpiece outlet 18 using the daruma drop method that utilizes natural falling as in the conventional method.

That is, in this embodiment, the air cylinder device 46 is operated as described above to intermittently move the piston rod 47 and the lid member 48 forward and backward, and the hot forged material W is intermittently taken out from the workpiece outlet 18. It is. The hot forged material W taken out has a temperature of about 1000°C to 1200°C. and,
The hot forged material W taken out is transferred to a forging die using a chute or the like, and hot forged in the forging die. As the hot forging process, a rough forging process and a finish forging process are performed, and then a deburring process is performed.

Incidentally, if necessary in the heating process described above, the vertical heating furnace 12 can be oscillated in the horizontal direction about the support 8.

(Effects of Example) In this example, the dummy rod 35 is placed in the work passage 19 of the vertical heating furnace 12 at the start of the heating process.
Since the hot forging material W can be heated with the hot forging material W placed on the dummy rod 35, unlike the conventional method, the hot forging material W taken out from the work outlet 18 is , the temperature is high from the first one, so it is possible to solve the problem of producing waste material at the start of the heating process.

In addition, when the end of the heating process approaches, after inserting the last hot forged material W into the workpiece passageway 19 from the workpiece inlet 17, the air cylinder device 42 is operated to remove the piston rod 43 and the lid member 44. The workpiece inlet 17 is kept closed by the lid member 44 by advancing the workpiece, and the hot forging material W is not inserted through the workpiece inlet 17. Therefore, unlike the conventional horizontal type workpiece heating device, the vertical type No hot forged material W remains in the heating furnace 12.
Therefore, it is possible to solve the problem of waste material being generated at the end of the heating process.

Further, in this embodiment, a dummy rod 35 made of fireproof material is used.
Since there is substantially no induction heating, this is advantageous in terms of reducing power consumption.

In addition, in this embodiment, after the dummy rod 35 is taken out from the workpiece outlet 18, the workpiece receiving surface 35a of the dummy rod 35 receives the hot forging material W that falls one after another, so the workpiece receiving surface 35a is used as a separate member. There is no need to provide any particular members.

[Other Embodiments] In addition, the present invention is not limited to the embodiments described above, and can be implemented with appropriate modifications within the scope of the gist. For example, the workpiece is not limited to a hot forged material, but may be anything that can be heated. Further, in the above-described embodiment, the dummy rod 35 is continuously lowered, but the present invention is not limited to this, and the dummy rod 35 may be lowered intermittently. Further, in the above-described embodiment, the present invention is applied to the vertical heating furnace 12 of the induction heating type, but the present invention is not limited to this, and other heating methods having a built-in heating wire or the like may be used. Furthermore, dummy rod 35
A temperature sensor is provided on the workpiece receiving surface 35a of the hot forging material W received on the workpiece receiving surface 35a.
The temperature of the dummy rod 35 may be detected and the dummy rod 35 may be discharged from the work outlet 18 when the temperature reaches a predetermined temperature.

[Effects of the Invention] According to the vertical workpiece heating device of the present invention, it is possible to improve the problem of generation of waste material. Therefore, it is advantageous in terms of productivity and economy.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of the dummy rod before it is inserted into the vertical heating furnace;
Figure 2 is a side view of the dummy rod after it is inserted into the vertical heating furnace, Figure 3 is a front view of the dummy rod before it is inserted into the vertical heating furnace, and Figure 4 is a plan view. . In the figure, 1 is a frame, 12 is a vertical heating furnace, 17
18 is a workpiece inlet, 18 is a workpiece passage, 21 is a drive mechanism, 22 is a screw shaft, 24 is a lifting arm, and 35 is a dummy rod (dummy member).

Claims (1)

[Claims for Utility Model Registration] A vertical heating furnace having a workpiece inlet formed at an upper end, a workpiece outlet formed at a lower end, and a workpiece passing passage extending in the vertical direction connecting the workpiece inlet and the workpiece outlet; a dummy member that can be inserted into the workpiece passage of the vertical heating furnace from the workpiece outlet and that can be vertically raised and lowered and has a workpiece receiving surface; and the dummy member that is inserted into the workpiece passageway. A vertical workpiece heating device characterized by comprising a drive mechanism that lowers the workpiece by a predetermined distance.