JPH0192316A - Quenching apparatus - Google Patents

Abstract

PURPOSE:To eliminate temp. drop of a work and to enable quenching treatment by heating to the quenching temp., by arranging a supporting body engaging with the work in opening part at lower part of a furnace body and dropping the work into quenching vessel for a short time. CONSTITUTION:The furnace body 4 charging the work is descended and laid on upper face of an intermediate furnace body 3 and electric power is conducted in heating wire 7 to raise the atmosphere temp. in the furnace. When the work reaches to the prescribed temp., the furnace hearth 5 is descended by rotating cam member 24. By retreating a piston rod 29a in a piston cylinder 29, the furnace hearths 5, 5 are mutually separated to open the lower part of the intermediate furnace body 3. By rotating chuters 10, 10 supporting the work, the work is dropped and dipped into quenching medium in the quenching vessel 2. By this method, the time, when the work exposes in the atmosphere at out of furnace, it short and the temp. drop till dipping the work in the quenching medium is almost eliminated.

Description

[Detailed Description of the Invention] E: Industrial Field of Application This invention relates to an improvement in an apparatus for hardening a workpiece, mainly by heating the workpiece and immersing it in a hardening agent. .

[Prior Art] Conventionally, as an apparatus for quenching metal products, one having a structure in which a heating furnace and a quenching tank are connected is known.

This good quenching device heats the workpiece to a predetermined temperature in the heating furnace, then takes the workpiece out of the heating furnace, moves it onto the quenching tank, and immerses it in the quenching agent in the quenching tank. As a means of moving the workpiece,
For example, transportation means such as a crane or a walking beam are installed.

[Problems to be Solved by the Invention] However, in the above-mentioned quenching apparatus, the workpiece is exposed to the atmosphere outside the furnace for a long time while the workpiece is taken out of the heating furnace and inserted into the quenching tank. will be significantly cooled down.

For this reason, the heating temperature must be set much higher than the quenching temperature, and as a result, not only does high-temperature heating cause serious quality problems such as roughening of the surface of the workpiece, but also costs for fuel and furnace repairs are increased. The problem was that it was expensive.

[Objective of the Invention] The present invention has been made in view of the above circumstances, and it is an object of the present invention to enable quenching treatment by heating the workpiece to the quenching temperature, and thus to eliminate various problems caused by heating the workpiece to a high temperature. The purpose is to provide a hardening device that can

[Means for Solving the Problems] The quenching apparatus of the present invention has an opening at the lower end of the furnace body, a quenching tank arranged below the opening, and a quenching tank that engages with the work in the opening of the furnace body. In this case, a support body is provided to support the workpiece in the furnace main body and release the engagement with the workpiece to allow the workpiece to fall into the quenching tank.

[Function] In the quenching apparatus configured as described above, the quenching process is performed by dropping the heated workpiece into the quenching tank provided below the furnace main body, so the workpiece is not exposed to the atmosphere outside the furnace. The time is extremely short, so there is almost no temperature drop during that time. Therefore, the quenching process can be performed by heating to the quenching temperature, and various problems caused by high-temperature heating can be solved.

[Example] FIGS. 1 to 3 are side sectional views showing a hardening apparatus according to an example. The quenching equipment shown in these figures has a frame l
and a quenching tank 2 placed at the bottom of this frame l,
An intermediate furnace body 3 placed on the top surface of the frame l, a furnace body 4 placed on the top surface of this intermediate furnace body 3 and made movable in the vertical direction, and a furnace body 4 placed on the bottom side of the intermediate furnace body 3 that can be opened and closed. It is roughly composed of hearths 5 and 5 which can be freely shaped.

Here, the frame l is made by assembling steel members 1a... into a wooden frame shape, and installing a crosspiece member 1b in the vertically intermediate part with its longitudinal direction being in the first direction.
Fix it in the left and right directions in the figure, and then attach the plate l to the top.
It is made by fixing c.

Then, on the lower side of the crosspiece member tb, approximately half of the frame l is attached.
A quenching tank 2 is arranged which protrudes from the to the right side in FIG. The quenching tank 2 is box-shaped with an open top, and a free roller 6 is arranged at the bottom so as to slope slightly downward toward the right side.

Further, the intermediate furnace body 3 is ring-shaped, and a heating wire 7 is attached to the inner circumference thereof. Two shafts 8, 8 parallel to each other are passed through the side wall of the intermediate furnace body 3. The shaft 8 is rotatably supported by bearings 9 attached to the frame l. Also,
A shooter (support body) 10 is provided at the longitudinally intermediate portion of the shaft 8.
is installed.

The shooter 1O is constructed by constructing a plurality of crosspieces 1Ob on mutually parallel rods 10a, 10a. On the other hand, as shown in FIG. 3, a column 11 is fixed to the frame 1 with its longitudinal direction facing up and down, and a piston cylinder 12 is attached to the column 11 with its piston rod 12a facing downward. .

A lower end of the piston rod 12a is connected to an end of the shaft 8 via a crank rod I3. The shooter 10 is configured to rotate in the direction of the arrow X in FIG. 1 by making the piston rod 12a elongate, and to rotate in the opposite direction by contracting the piston rod 12a. A furnace body 4 is placed on the upper surface of the intermediate furnace body 3 configured as described above.

The furnace body 4 has a cylindrical shape with a bottom, and heating wires 7 are attached to the inner circumference of the furnace body 4. A fan 1 rotatable by a motor 14 is mounted on the ceiling of the furnace body 4.
5 are arranged. Further, a hanging ring 16 is fixed to the upper end of the motor 14. On the other hand, a guide bin I7 whose axis is directed in the vertical direction is attached to the frame 1 so as to be located on the side of the furnace main body. A bush 18 is attached to the outer periphery of the furnace body 4 and is slidably fitted to the guide pin 17. Based on this structure, the furnace body 4 is attached to the suspension ring I6 by a crane or the like. It is designed to slide up and down by hooking it up and down.

Next, the hearths 5, 5 are formed into a substantially semicircular plate shape having substantially the same diameter as the intermediate furnace body 3 by butting against each other. A heating wire 7 is attached to two sides of the hearth 5, and its upper edge is raised one step further so as to be brought into close contact with the lower end surface of the intermediate furnace body 3. These hearths 5, 5 are movable in the vertical direction and in the direction toward and away from each other by the following configuration.

That is, between the upper steel member 1a of the frame l and the crosspiece member 1b, guide posts I9... are installed at approximately four corners of the frame (■), and the guide posts 19... are provided with lifting tables. 20 is supported so as to be slidable in the vertical direction via bushes 21... On the other hand, the crosspiece member 1b
, two pairs of bearings 22 are arranged at approximately four corners of the lifting table 20. A shaft 23 is rotatably supported by the opposing bearings 22, 22.

Two cam members 24 are attached to the shaft 23 at a distance from each other. A roller 24a is rotatably supported at the upper end of the cam member 24. Also,
The lower end of the cam member 24 is connected to the lower end of the cam member 24 on the other shaft 23 side via a connecting rod 25. Note that the connecting rod 25 and the cam member are rotatable. On the other hand, a piston cylinder 26 is attached to the side of the frame l shown on the upper side in FIG. 2, and its piston rod 26a is rotatably connected to one end of the shaft 23 via a crank rod 27. Based on this configuration, the elevating table 20 is pushed up by the cam member 24 when the piston rod 26a of the piston cylinder 26 is extended, and is lowered by its own weight when the piston cylinder is contracted.

The upper end surfaces of the hearths 5, 5 come into close contact with the lower end surfaces of the intermediate furnace body 3 when the elevating table 20 is raised, and are separated from each other when the elevating table 20 is lowered.

Further, the hearth 5 is supported by a guide rail 28 attached to the elevating table 20 so as to be slidable in the left-right direction in FIG. On the other hand, the elevating table 20 has two piston cylinders 2 with piston rods 29a directed toward the center.
9 and 29 are attached, and the piston rod 29a is attached to the lower part of each hearth 5. And hearth 5
- 5 are brought into contact with each other when the piston rods 29a are in an extended state, and separated from each other when the piston rods 29a are in a contracted state to open the lower side of the intermediate furnace body 3.

Next, a process of hardening the workpiece 30 using the hardening apparatus configured as described above will be described.

First, when inserting the workpiece 30 into the furnace body 4,
With the furnace body 4 lifted by a crane or the like, the workpiece 30 is placed on the shooter 10 by a forklift or the like. Note that the work 30 is placed in a case such as a basket, for example. Further, the hearths 5 are brought into contact with each other and are raised to bring their upper end surfaces into close contact with the lower end surface of the intermediate furnace body 3.

Next, the furnace body 4 is lowered and placed on the upper surface of the intermediate furnace body 3, and the heating wires 7 are energized to increase the atmosphere in the furnace. At this time, the fan 15 is rotated to stir the atmosphere in the furnace.

Next, when the workpiece 30 reaches a predetermined quenching temperature, the cam members 24... are rotated to lower the hearths 5, 5, and then the piston rod 29a of the piston cylinder 29 is brought into a contracted state to reduce the hearths 5, 5. are spaced apart from each other, and the intermediate furnace body 3
Open the bottom of the. At the same time, rotate the shooter IO in the direction of arrow X. Then, the workpiece 30 falls,
It is immersed in a quenching agent such as water placed in a quenching tank 2. Note that the workpiece 30 slides on the free roller 6 in the quenching tank 2, moves to the right side in FIG. 3, and is lifted out of the quenching tank 2 after a predetermined period of time has passed.

In the above-mentioned hardening apparatus, the heated workpiece 30 is transferred to the furnace body 4.
Although the workpiece 30 is dropped into the quenching tank 2 provided below to perform the quenching process, the time that the workpiece 30 is exposed to the atmosphere outside the furnace is extremely short, and therefore the temperature rises until it is immersed in the quenching agent. There is almost no descent. Therefore, since it is only necessary to heat the workpiece 3o to the quenching temperature, it is possible to prevent quality deterioration such as roughness of the surface of the workpiece 30 caused by high-temperature heating, and to significantly reduce fuel costs. Can be done. In addition, heat loss on each furnace wall can be prevented, and the construction is simple because no special conveyance mechanism is required for immersing the workpiece 30 in the quenching agent. Therefore, its maintenance and inspection are easy. It is extremely promising as a device for quenching.

In the above embodiment, the rotatable shooter 1O is provided as a means for supporting the workpiece 30 in the furnace body 4, but the structure is not limited to this. The structure is arbitrary as long as it can be supported within the furnace body 4 and allows the workpiece 30 to fall by releasing the engagement.

[Effects of the Invention] As explained above, in the quenching apparatus of the present invention, an opening is provided at the lower end of the furnace body, and a quenching tank is arranged below the opening, and the opening of the furnace body engages with the workpiece. The structure includes a support that supports the workpiece inside the furnace body and releases the engagement with the workpiece to allow the workpiece to fall into the quenching tank, so the time that the workpiece is exposed to the atmosphere outside the furnace is extremely short. , there is almost no temperature drop during that time. therefore,
By heating to the quenching temperature, the quenching process becomes possible, which not only prevents deterioration of quality such as surface roughness of the workpiece, but also significantly reduces fuel costs. In addition, heat loss to the furnace wall can be prevented, and the structure is simple because no special transport mechanism is required to immerse the workpiece in the quenching agent, making maintenance and inspection easy. .

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 to 3 are views showing one embodiment of the present invention, in which FIG. 1 is a partial side sectional view showing a hardening device, and FIG. 3, which is a cross-sectional view taken along the -■ line, is a view taken in the direction of the ■ direction in FIG. 1. 4... Furnace body, IO... Shooter (support body).

Claims (1)

[Claims] An opening is provided at the lower end of the furnace body, and a quenching tank is arranged below the opening, and the opening of the furnace body engages with the workpiece to support the workpiece within the furnace body and disengages from the workpiece. A quenching device characterized by being provided with a support for dropping a workpiece into a quenching tank.