JPS603891B2 - Forging furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a heating furnace for forging, and its purpose is to obtain an effective heating effect.

Conventionally, as shown in Fig. 6, a heating furnace for forging is divided into a hearth b side and a ceiling c side with a heating chamber a in between.
With the ceiling c side fixed where the burner is installed, the hearth b
A commonly used method was to provide a rotatable side so that the workpiece w was placed against the hearth b, and then rotate the hearth b to obtain its heating effect. ,
The conventional structure as described above has the following problems.

■ Since the workpiece is placed facing the hearth, no effective heating effect can be obtained on the surface in contact with the hearth.

■ It is desirable that the heating temperature in the heating chamber is not always constant during each process, but should be changed over time.
However, when the hearth and the work rotate integrally as in the conventional structure, it is not possible to respond quickly to changes in heating temperature in each process over time.
In other words, when the hearth and workpiece rotate integrally as in the conventional structure, it is necessary to simultaneously heat not only the workpiece but also the hearth due to changes in heating temperature in each stroke. As a result, heat is lost to the hearth side, making it impossible to effectively heat the workpiece. The present invention is an attempt to improve the conventional situation as described above.

That is, in the present invention, a side wall portion surrounding the main body portion including a heating chamber is separately provided, and the side wall portion is provided rotatably through intermittent drive, and the side wall portion is provided with a By providing the supply hole for the workpiece so that it is located slightly above the hearth surface of the heating chamber, the base part of the workpiece can be placed in the supply hole with the tip part protruding into the heating chamber. By supporting the workpiece in a cantilevered manner and by rotating the side wall portion along the heating chamber while the workpiece is supported in a cantilevered manner through the supply hole, the effect on the workpiece can be improved. The device is characterized in that a side wall portion is rotatably provided with respect to the main body portion by intermittent driving, and the main body portion is provided with a side wall portion that corresponds to the side wall portion. A heating chamber is provided so that the surface is closed, and a workpiece supply hole is closed in the side wall so as to correspond to the heating chamber. The reason is that it is arranged so that it is located slightly above the hearth. Specific embodiments of the present invention will be described below with reference to illustrative drawings.

In each of the drawings shown in FIGS. 1 to 4, A indicates a heating furnace installed on the pedestal 1. Further, B is a workpiece supply device similarly installed on the pedestal 1, and C is a workpiece discharge device, and the discharge device C is located at a position corresponding to the discharge chute 8 provided on the main body 3, as will be described later. The supply device B is provided adjacent to the discharge device C. The heating furnace A consists of a main body part 3 and a side wall part 4, and the main body part 3 is connected to a base 2.
On the other hand, the side wall part 4 is provided on the base 2 via a bearing 5 so as to be rotatable in the horizontal direction so as to surround the outer periphery of the main body part 3.

Thus, the heating chamber 6 is provided in the main body 3, and the heating chamber 6 is provided along the peripheral wall surface of the main body 3.

That is, it is provided in an annular shape with a substantially U-shaped cross section so as to open a corresponding surface with the side wall portion 4 . A burner 7 is installed on the ceiling 6' of the heating chamber 6, while a workpiece discharge chute 8 is installed diagonally downward toward the base 2 on the hearth 6''.

A discharge conveyor 9 is provided below the base 2, and the distal end of the discharge chute 8 is provided so as to face the conveyance surface 9' of the discharge conveyor 9. Further, a gear 10 is fixed to the side wall portion 4 near its lower end.

The gear 10 is provided in an annular shape along the outer peripheral surface of the side wall 4 so as to connect the side wall 4, while a motor 11 is fixedly installed on the base 2 side, and a drive shaft 1 1' of the motor 11 is provided. A gear 12 is mounted so as to mesh with the gear 10. That is, the side wall portion 4 is provided so as to be able to be driven intermittently via the motor 11. The same side wall 4 has a workpiece supply hole 1.
3... are entered at regular intervals over the entire circumferential surface.

The supply holes 13 are provided in correspondence with the heating chamber 6 provided on the side of the main body 3, so that they face the heating chamber 6 at a position slightly above the hearth 6''. Furthermore, the above-mentioned supply holes 3 are provided in the side wall portion 4 as shown in FIG.
By providing a stepped portion on the inner wall surface corresponding to the entrance position of . 6. It is provided so that it protrudes slightly inward.
Both the workpiece supply device B and the workpiece discharge device C are mounted on the support leg 23.
, 23, 23, and a slider 24 provided so as to be able to move forward and backward so as to be able to slide along the guide rail. A groove 25 is carved.

The recessed register 25 is connected to each supply hole 13 so that its tip can be selectively moved around the supply holes 18 that connect to the side wall portion 4. They are provided in correspondence with each other. Further, a pair of front and rear support shafts 15 and 16 are constructed on the guide rail 14 at its bottom side, and both support shafts 15 and 1
6 has a pair of left and right sprockets 15', 15', 16
', 16' are suspended. And between each pair of front and rear sprockets 15', 16', 15', 16' is a chain 17.
, 17 are stretched, and bosses 18, 18 are fixed to the chains 17, 17 at arbitrary positions, while the supporting legs 23
, 23, and a sprocket 20' mounted on a drive shaft 20 of the motor 19;
Another sprocket 16' mounted on the support shaft 16
A chain 21 is stretched between them. A bracket 22 is connected from the slider 24 in correspondence with the chains 17, 17.
, 22 are vertically disposed downward, and elongated holes 22', 22' are opened in the vertical direction in the brackets 22, 22. For the long holes 22', 22', the bosses 18, 1
8 is slidably engaged. Further, the slider 24 is provided with push rods 26a and 26b for the workpiece along the groove 25 so that the push rods 26a and 26b for the workpiece can be pushed along the grooves 25, respectively. The push rod 26a is slightly longer than the push rod 26a. Next, its effect will be explained.

1 to 3 show a workpiece feeding device B in a state in which the side wall portion 4 of the heating furnace A stops intermittent driving.
In the figure, the slider 24 is in a retracted state, and in the workpiece discharging device C, the push rod 26b is inserted into the supply hole 13 through the forward movement of the slider 24.

As described above, in a state in which the slider 24 is in the retracted position in the work supply device B, the work (steel material) is supplied into the groove 25 via the feeding mechanism (not shown). With the workpiece being supplied into the groove 25, the workpiece is inserted into the supply hole 13 through the front needle action of the slider 24. That is, as shown in FIG. 5, a state is obtained in which the workpiece is supported in a cantilever manner with respect to the supply hole 13 with its tip end protruding into the heating chamber 6. With the workpiece supported in the supply hole 13 in this manner, the slider 24 in the supply device B is moved backward, and the side wall portion 4 in the heating furnace A is rotated by one pitch through the intermittent drive of the motor 11. This effect can be obtained.

In this state where the side wall portion 4 has rotated by one pitch, the side wall portion 4 is rotated so that the workpiece can be inserted into the adjacent supply hole 13 through the forward movement of the slider 24 in the feeding device B. Through the intermittent drive and the movement of the slider 24 in the supply device B, it is possible to sequentially insert the work into each supply hole 13.
The workpieces inserted into each supply hole 13 in this way are sent along the heating chamber 6 through the intermittent driving of the side wall portion 4; While the workpiece is sent along the heating chamber 6 through the burner 7, a heating action, that is, a forging action is obtained on the workpiece. Therefore, in the state where the side wall portion 4 is sent over approximately 360 degrees through the intermittent drive as described above, that is, the state where it is sent to a position corresponding to the discharge chute 8, the third
As shown in the figure, by inserting the push bar 26b into the supply hole 13 through the forward action of the slider 24 in the discharge device C, the workpiece that has been inserted into the supply hole 13 until now is pushed out. By pushing the work toward the direction of the heating chamber 6 by the rod 26b and pushing the work into the heating chamber 6 via the push shaft 26b, the work is sequentially sent out of the heating furnace A via the discharge chute 8 and the discharge conveyor 9. This provides the effect of sending out

Furthermore, by applying a pressure of about 3 Aq in the heating chamber 6 and blowing out a part of the high temperature furnace air in the heating chamber 6 through each supply hole 13 as shown in FIG. It is possible to obtain a heating effect. The present invention is constructed as described above, and as described above, a side wall portion is rotatably provided in a main body portion provided with a heating chamber so as to surround the heating chamber. The supply hole of the workpiece is provided so as to be located slightly above the hearth surface of the heating chamber, and the base of the workpiece is supported in a cantilevered manner by the supply hole with the tip of the workpiece protruding into the heating chamber. On the other hand, by rotating the side wall part through intermittent drive with the work supported in a cantilevered manner as described above to heat the side wall part, the conventional structure, that is, the As shown in Figure 6, the thermal efficiency can be significantly improved compared to a structure in which heating is performed by rotating the hearth while the ceiling is fixed, resulting in an effective heating effect. I was able to obtain the following.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the entire forging heating furnace according to the present invention, Fig. 2 is a sectional view thereof, Fig. 3 is a plan view thereof, Fig. 4 is a sectional view of the feeding device, and Fig. 5 is a feeding device. FIG. 6 is a cross-sectional view showing the working state of the hole portion, and FIG. 6 is a cross-sectional view showing the conventional structure. A...Heating furnace, B...Work supply device, C...Work discharge device, 1... Frame, 2... Base, 3... Main body, 4... Side wall, 5... ...Bearing, 6...Heating chamber, 6'...Ceiling, 6''...Heart, 7...Burner, 8...Discharge chute, 9...Discharge conveyor, 9
'...Conveyance surface, 10...Gear, 11...Motor, 1
1'...drive shaft, 12. ．． ．． Gear, 13... Work supply hole, 14... Guide rail, 15, 16... Support shaft, 15
', 16', 16''... Sprocket, 17... Chain, 1
8...Boss, 19...Motor, 20...Drive shaft, 2
0'... Sprocket, 21... Chain, 22... Bracket, 22'... Bottom hole, 23... Support leg, 24... Slider, 25... Concave groove, 26a, 26b... Push rod. Figure 1 Figure 2 Figure 4 Figure 3 Figure 5 Figure 6

Claims (1)

[Claims] 1. A side wall portion formed in a cylindrical shape is rotatably provided on the outer periphery of a main body portion formed in a cylindrical shape by intermittent driving, and a heating chamber formed in an annular shape opening toward the side wall portion is provided in the main body portion. At the same time, in the side wall part, workpiece supply holes are opened at regular intervals along the circumferential direction so as to communicate with the heating chamber. A heating furnace for forging located slightly above the hearth.