JPH03210941A - Casting furnace - Google Patents

Abstract

PURPOSE:To prevent cutting-off of a welded bar pulled out from a molten metal discharging hole by arranging a minutely lifting device to a frame base for supporting a furnace body to adjust position of the furnace body n vertical direction. CONSTITUTION:The upper part of furnace body 1 for casting furnace is connected as tiltable through the frame base 2 and the shaft 5. At lower part of frame base 2, the minutely lifting device 7 for adjusting the vertical position of furnace body 1 is arranged. In the case of developing misalignment in vertical direction between the molten metal discharging hole 3 and the pinch roller with heat expansion of the furnace body 1, by turning a handle 10 in the minutely lifting device, an engaging member is vertically shifted. The furnace body 1 is tilted by a very little amt. as centering the shaft 5. This tilting movement can be regarded as vertical movement of straight line near the molten metal discharging hole 3. By this method, the cutting-off of casting caused by the above misalignment is avoided, and continuous casting can be executed for long time.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Field of Industrial Application This invention relates to a casting furnace used for continuous casting by drawing out molten metal to the side of the furnace body.

BACKGROUND ART Intake and exhaust valves incorporated in gasoline engines for automobiles are reciprocated at high speed in a high-temperature environment, and therefore the material of the sliding shaft portion is required to have particularly high wear resistance. Therefore, in the manufacturing process of the above valve,
In addition to the valve face, which is tightly attached to the valve hole in the cylinder head, a CO material such as Stellite, which has excellent wear resistance, is
It is widely practiced to manufacture a welding rod to serve as a sliding shaft from an alloy, and welding this welding rod to the valve face to manufacture one valve.

By the way, since the above-mentioned stellite is difficult to heat-treat, forge, etc., a continuous casting method is generally used to manufacture the above-mentioned welded rod. And the specific method is:
After the furnace body is filled with molten metal, the molten metal is continuously discharged to the side of the furnace body from the outlet provided on the lower side of the furnace body, and the molten metal is removed by a cooling die provided around the outlet. A horizontal continuous casting method is known in which the welded rod is continuously cast by cooling and casting the welded rod into a rod shape, and then inserting the cooled rod between pinch rollers arranged coaxially with the outlet and drawing it out. ing.

[Problems to be Solved by the Invention] However, in the above-mentioned horizontal continuous casting, vertical misalignment occurs between the outlet and the pinch roller due to thermal expansion of the furnace body as casting continues. There was a drawback that the welding rod that was pulled out from the outlet was cut, making it impossible to perform continuous casting for a long time.

The present invention was made against this background, and an object of the present invention is to provide a casting furnace that can realize continuous casting over a long period of time by preventing the welding rod pulled out from the outlet from being cut.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a pedestal that supports a furnace body with a micro elevating device that adjusts the vertical position of the furnace body.

[Operation 3] According to the above configuration, the misalignment can be solved by moving the furnace body up and down by a minute amount in the vertical direction according to the misalignment in the vertical direction between the outlet of the furnace body and the pinch roller. .

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, the casting furnace of this embodiment is
A rectangular cylindrical furnace body 1 filled with molten stellite S, a pedestal 2 installed on a floor F to support the furnace body 1, and a drain port 3 formed on a lower side surface of the furnace body 1, A cooling die 4 is provided around the outlet 3.

Here, the upper part of the furnace body 1 is rotatably connected to the pedestal 2 via a shaft 5. A hydraulic cylinder 6 is mounted between the upper side surface of the furnace body 1 and the lower part of the frame 2, and the furnace body l is rotated about the shaft 5 by the expansion and contraction of the piston rod 6a of the hydraulic cylinder 6. It is now possible to

On the other hand, the drain port 3 is formed to face a pinch roller (not shown) arranged on the side of the furnace body l, and its position is coaxial with the pinch roller when the furnace body l is empty. It is determined. The cooling die 4 is used to cool the molten JhS discharged from the outlet 3, and is provided with a flow path (not shown) through which cooling water circulates.

At the bottom of the pedestal 2, there is a stopper guide provided on the bottom surface of the furnace body 1! A micro elevating device 7 is provided which engages with a to adjust the vertical position of the furnace body l. The micro elevating device 7 will be explained below with reference to FIGS. 1 to 5.

As shown in FIGS. 1 and 2, the micro elevating device 7 is arranged in the width direction of the pedestal 2 and the lower surface of the furnace body l (in the left-right direction in FIG. 2).
two jacks 8 interposed between both ends, a drive shaft 9 whose one end protrudes to the side of the pedestal 2 through these jacks 8, and both ends of this drive shaft 9 (only one end side is shown in the figure).
The handle 10 is attached to the handle 10.

Here, as shown in FIGS. 3 to 5, the jack 8 has a worm wheel 13 inside a housing 12 connected to the pedestal 2 via a frame +1, with its axis directed in the vertical direction. , and is mounted in a state that is rotatable around the axis;
A screw shaft 15 protruding from the top of the furnace body 1 is screwed onto the screw shaft 15, and an engaging member 16 that engages with the stopper guide la on the lower surface of the furnace body l is rotatably connected to the upper end of the screw shaft 15. It is generally configured such that it is attached via a pedestal 17.

A side portion of the pedestal 17 is formed to extend laterally along the upper surface of the housing 12. A guide shaft 19 is attached to the tip of the side of the pedestal 17 and is connected to the housing 12 or fitted with the near bush 18. The linear bush 18 and the guide shaft 19 prevent the engaging member 16 from rotating. , the engaging member 16 is guided in the vertical direction.

On the other hand, a worm gear 20 that meshes with the worm wheel 13 is disposed on the side of the worm wheel 13. The worm gear 20 is fitted to the drive shaft 9 rotatably supported by the nose 12 via a key 21, and as the drive shaft 9 rotates, the worm wheel 13 is rotationally driven. The screw shaft 15 and the engaging member 16 can be moved up and down.

The drive shaft 9 is rotatably supported by each housing 12 and fitted with the two gears 2o, and the drive shaft 9 is connected to one end of these worm shafts 22 via a universal joint 23. The connecting shaft 24 to be connected
24, and handle shafts 26 and 26 connected to the other end side of the worm shaft 22 via a universal shaft 25.
The connecting shaft 24 is a coupling 27.
One drive shaft 9 as a whole is connected through the
is configured.

Furthermore, the handle IO is made up of flanges 28 (only one of which is shown in the figure) fitted to the tip of each handle shaft 26, and a dial indicator 29 fitted to these flanges 28. By rotating the drive shaft 9, the drive shaft 9 rotates, and the amount of rotation is indicated by a dial indicator 29.

In the casting furnace configured as described above, after the inside of the furnace body l is filled with molten metal S, the molten metal is discharged from the outlet 3 and cooled by the cooling die 4, whereby a small diameter welded rod is cast. be done. Then, the cast welding rod is attached to a pinch roller (
The molten metal S, which is sandwiched between the molten metal and the molten metal (as shown in the figure) and drawn out and discharged from the outlet 3, is successively cooled and a welding rod is continuously cast.

In the above casting process, the furnace body l thermally expands and the outlet 3
If vertical misalignment occurs between the gripper and the pinch roller, the handle 10 of the micro elevating device 7 is rotated to move the engagement member 16 up and down. As a result, the furnace body 1 engaged with the engaging member 16 rotates by a minute amount around the shaft 5, but this rotational movement does not occur in the vicinity of the outlet 3 as long as the amount of movement of the engaging member 16 is minute. It can be regarded as a linear vertical motion.

Therefore, according to this embodiment, by appropriately rotating the handle 10 of the micro elevating device 7 according to the misalignment between the outlet 3 and the pinch roller during casting, the alignment between the outlet 3 and the pinch roller can be adjusted. Continuous casting can be continued for a long time by avoiding breakage of the welded rod due to misalignment, and as a result, the operating rate of the casting furnace is greatly improved and productivity is greatly improved.

In addition, when continuous casting was actually performed using the micro lifting device 7 of this embodiment, the lifting amount of the furnace body l was 10 m at the maximum.
It was about n+, and in most cases, 2 to 3 mm was sufficient.

In addition, in this embodiment, the drive shaft 9 of the micro elevating device 7 is
Divide as appropriate between the jacks 8 and install the universal joint 23.
and a coupling 27, and handles IO are provided at both ends of the drive shaft 9, so even if there is a difference in the amount of elevation of each jack 8 and the operation of the drive shaft 9 is hindered, these universal levers 23 Alternatively, by removing the coupling 27 and making the left and right jacks 8 independent, the left and right heights of the furnace body 1 can be adjusted.

Note that in this example, the explanation E-r: is limited to the case where welding rods used for automobile engine valves are cast.
The present invention is not limited to this, but can be applied to various other horizontal continuous casting furnaces.

Furthermore, in this embodiment, the micro-elevating device 7 in particular is operated by the operator rotating the handle IO, but the present invention is not limited to this, and an actuator such as a motor may be connected to the drive shaft 9. It is also possible to automatically rotate the drive shaft 9 according to the amount of misalignment between the drain port 3 and the pinch roller.

Furthermore, in this embodiment in particular, two jacks 8 are provided below the furnace body 1, but the invention is not limited to this, and one, three or more jacks may be provided depending on the size of the furnace body l, etc. It's okay.

[Effects of the Invention] As explained above, the present invention is provided with a minute lifting device that adjusts the vertical position of the furnace body filled with molten metal, so that the furnace body can be moved up and down according to the misalignment between the spout and the pinch roller. It is possible to eliminate misalignment by raising and lowering a small amount in the direction. Therefore, it is possible to avoid cutting of the cast product due to the above-mentioned misalignment, and to perform continuous casting for a long time.
It has the excellent effect of significantly improving the operating rate and production efficiency of the casting furnace.

[Brief explanation of drawings]

1 to 5 all show one embodiment of the present invention, FIG. 1 is a side view of the casting furnace, FIG. 2 is a front view of the casting furnace, and FIG. 3 is 1--1 in FIG. 1. 4 is a sectional view taken along line 1 in FIG. 3, and FIG. 5 is a sectional view taken along line 1 in FIG. l... Furnace body, 2... Frame, 3...
Exhaust port, 4... Cooling die, 7... Micro lifting device, S... Molten metal.

Claims (1)

[Claims] A furnace body in which molten metal is stored, a pedestal that supports this furnace body,
The furnace includes a drain port provided at the bottom of the furnace body to discharge the molten metal inside the furnace body to the side of the furnace body, and a cooling die provided around the drain port to cool the molten metal. A casting furnace, characterized in that the pedestal is provided with a micro elevating device for adjusting the vertical position of the furnace body.