JPH0121844B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a vacuum heating device used in heat treatment of metals, etc. to vacuum-heat a material to be heated and then subsequently cool and harden the material. .

<Prior art> Conventionally, there have been vacuum heating devices that heat a vacuum-heated material by cooling it with gas and quenching it, and vacuum heating devices that quench the material by cooling it with oil (for example, Japanese Patent Publication No. 55-24492). ) is already known.

<Problems to be Solved by the Invention> However, the above-mentioned vacuum heating device that uses gas for cooling has poor cooling ability, and even if pressurized gas is used, the cooling ability does not increase much. Moreover, when pressurized gas is used, the cooling chamber must be constructed to resist pressure, which may impose restrictions on the structure and processing, which is disadvantageous as it causes an increase in price.

In addition, although the above-mentioned vacuum heating equipment that cools with oil can be expected to have sufficient cooling capacity, fine droplets of oil scattered during processing enter the vacuum heating chamber and contaminate it, which has a significant negative effect on the degree of vacuum inside the vacuum heating chamber. give.
Furthermore, since oil adheres to the surface of the heated material that has been quenched by cooling, a post-process is required to remove this oil.

Recently, some proposals have been made to solve the above problems by using fluidized powder as the cooling medium and using a fluidized bed as the cooling section for quenching and cooling the vacuum-heated material. ing.

However, such a furnace apparatus has poor workability in transporting the material to be heated, and cannot ensure the safety of the workers.

<Means for Solving the Problems> The present invention was proposed in view of the above, and includes heating chambers arranged side by side on one side of the airtightly closed holding section and a cooling section connected below. An opening that can be opened and closed by a cover material is formed on the side surface of the holding section facing the chamber, and a table extends outward from the lower edge of the opening. A fork-shaped support car with wheels is positioned on the platform, and the wheels are engaged with guide rails provided opposite to a lifting frame that can be moved up and down by a lifting device to support the support car in a movable manner. The above-mentioned carrier is removably supported from below on the upper end of the guide provided at the tip of the operating mechanism provided on the underside of the table, and the heated material placed on the table is placed on the carrier. The material to be heated is supplied to the heating chamber by the expansion and contraction action of the operating mechanism, and the material to be heated is heat-treated, and the material to be heated, which has been heat-treated in the heating chamber by the expansion and contraction action of the operating mechanism, is placed on a carrier and placed in the holding section. In this state, the elevating frame is positioned in the cooling section together with the carrier using the elevating mechanism to cool the material to be heated, and then the elevating mechanism is used to raise the receiving cart to the holding section and move the material to be heated to the table. The present invention relates to a vacuum heating device characterized by:

<Function> According to the vacuum heat treatment apparatus of the present invention, the material to be heated is placed on the table extending from the lower end of the opening provided on the side surface of the holding section in which the vacuum heating chambers are arranged side by side. By simply driving the device, the material to be heated is recovered from the table after the heating and cooling processes, ensuring safety during the process and improving workability and product quality stability. High-quality manufacturing processes can be implemented.

<Example> Examples of the present invention will be described below.

The drawing shows an embodiment of the vacuum heating device according to the present invention, and the vacuum heating device 1 has a vacuum heating chamber 3 arranged in parallel on one side of a holding section 2 that is airtightly closed, and a vacuum heating chamber 3 arranged in parallel on one side of a holding section 2 that is airtightly closed. A cooling section 4 is provided in series.

An opening 5 is provided on the side surface of the holding section 2 facing the vacuum heating chamber 3, and a lid member 6 faces the opening 5 so as to be openable and closable. A table 7 is extended outside the lower edge of the opening 5, and when the lid member 6 opens the opening 5, the heated material a on the table 7 can be carried into the holding section 2. , or heated material a in the holding section 2
is carried out onto table 7.

The material to be heated a may be a single object, or may be a number of small items stored in a heat-resistant basket or the like. Further, the material to be heated a is brought into and out of the table 7 and the holding section 2 by a mechanical method using a cylinder or the like, or by a manual method using a fork or the like.

A fork-shaped receiving carriage 8 is positioned between the above-mentioned holding section 2 and cooling section 4. This carrier 8 is
As shown in FIG.
10 is extended, and a receiver 11 is attached to the edge of the board 9.
In addition, there are wheels 12 on the left and right sides...
will be established. The wheels 1 of the base plate 9 are mounted on horizontal guide rails 14, 14, which have a U-shaped cross section and are provided oppositely to the gate-shaped lifting frame 13 located inside the storage section 2.
2 and 12 are engaged to support the carriage 8, and the elevating frame 13 is attached to the elevating mechanism 15, which is a vertical cylinder provided on the upper surface of the holding section 2. In addition, a hook-shaped locking portion 18 with an open bottom surface provided at the upper end of a vertically long plate-shaped guide material 17 provided at the tip of the operating mechanism 16, which is a horizontal cylinder provided on the lower side of the table 7, is connected to the holder of the board 9. 11 from above.

Therefore, when the operating mechanism 16 is extended, the carriage 8 is guided by the guide rails 14 and advances horizontally, and when the operating mechanism 16 is retracted, the carriage 8 is guided by the guide rails 14, 14.
4, 14 and retreat. Also, the carriage 8
When the elevating mechanism 15 is extended, the elevating frame 13 is lowered, and the rod 11 is disengaged from the locking part 18 and descends. When the elevating mechanism 15 is contracted, the elevating frame 13 is raised, and the frame 13 is raised, reaching the highest state. When this happens, the receiving rod 11 engages with the locking portion 18 from below.

A communication port 19 is provided on the side surface of the vacuum heating chamber 3 facing the storage section 2, and a partition lid material 20 that can be airtightly closed or opened is faced to the communication port 19. 20 is attached to an opening/closing mechanism 21 shown as a vertical cylinder.

Further, inside the vacuum heating chamber 3, a pedestal 22 is installed into which the arm rod 10 of the pedestal car 8 can be inserted or removed.

The cooling section 4 described above is continuous from the holding section 2 downward, and below the holding section 2 is a gas dispersion plate 23 made of a perforated plate or a wire mesh having numerous small holes.
is installed horizontally, and a gas inflow chamber 24 is formed below the gas distribution plate 23.

Then, the upper part of the storage part 2 and the upstream gas inflow chamber 24
are connected by a connecting duct 25, and a blower 26 is provided in the middle of the connecting duct 25 to force-feed the gas in the storage section 2 into the gas inflow chamber 24.

In the cooling section 4 described above, a heat-resistant powder 27 such as alumina or zircon sand is placed on a gas distribution plate 23.
The heat exchange member 28, for example, in the form of a spiral pipe with fins, is provided so as to accumulate on the upper surface of the heat exchange member 28. Then, the heat exchange member 28 is connected to a temperature adjustment mechanism 29, and the temperature detector 30 connected to the temperature adjustment mechanism 29 is made to face the connection duct 25 described above.

The vacuum heating device of the present invention has the above-described configuration,
The process of heat-treating the material to be heated a using this vacuum heating device is as follows.

First, the material to be heated a is placed on the table 7 and the opening 5 is opened by the lid member 6, and then the material to be heated a is pressed and moved from the opening 5 into the holding section 2, and the receiving carriage 8 Place it on the armrest 10.

Next, the opening 5 is airtightly closed with the lid 6, and the opening/closing mechanism 21 raises the partition lid 20 to open the communication port 19, and then the operating mechanism 16 moves the carriage 8 forward to cover the opening. Heating material a is placed in vacuum heating chamber 3
be located inside.

In this case, the arm rod 10 of the carrier 8 is connected to the vacuum heating chamber 3.
Since it is slightly higher than the inner pedestal 22, the arm rod 10 is inserted between the pedestals 22 and the heated material a is positioned on the pedestal 22.

When this state is reached, the lifting mechanism 15 is slightly lowered, and when the receiving carriage 8 is slightly lowered and the material to be heated a is transferred onto the receiving stand 22, the operating mechanism 16 is contracted and the receiving mechanism 15 is lowered. Cart 8 and guide rail 1
4 and 14, and the opening/closing mechanism 2
1, the partition lid member 20 is lowered to airtightly close the communication port 19.

In this state, the material to be heated a is inside the vacuum heating chamber 3 and is sealed, so that the material to be heated can be efficiently vacuum heated.

After heating the material to be heated a at a desired constant temperature and for a certain period of time, the opening/closing mechanism 21 raises the partition cover 20 to open the communication port 19, and the operating mechanism 1
6 to advance the carrier 8 into the vacuum heating chamber 3. Then, the elevating frame 13 is slightly raised by the elevating mechanism 15, and when the material to be heated a is placed on the arm rod 10 and lifted from the pedestal 22 as the receiving cart 8 rises, the operating mechanism 16 is retracted and the receiving cart is lifted. 8
is moved backward along the guide rails 14, 14, the material to be heated a is located in the holding section 2, and the partition lid material 2
0, the communication port 19 is closed.

Next, the blower 26 is driven, and the internal air of the holding section 2 is sucked into the connecting duct 25, forced into the gas inflow chamber 24, and is blown out to the bottom of the cooling section 4 by the gas distribution plate 23. By injecting this gas, the heat-resistant powder 27
is in a fluid state.

Next, the elevating frame 13 is lowered into the inside of the cooling section 4 by operating the elevating mechanism 15 . When the elevating frame 13 is lowered, the carrier 8 on which the heated material a is placed
However, when the carriage 8 is lowered, the receiving rod 11 engages with the locking part 18 from below, so the carriage 8 can be lowered as it is.

As described above, when the heated material a on the carrier 8 is located in the cooling section 4, the heated material a is efficiently cooled by contact with the flowing powder and gas rising through the cooler 4. . Furthermore, the inside of the cooling section 4 and the holding section 2 become high in temperature due to the heat of the heated material a, but this temperature is detected by the temperature detector 30, and the refrigerant flows from the temperature adjustment mechanism 29 to the heat exchange member 28, so that The temperature inside the cooling section 4 and the holding section 2 can be appropriately controlled.

Then, the material to be heated a is cooled in the cooling section 4 and quenched to a desired state, the operation of the blower 26 is stopped, and the gate-shaped elevating frame 13 is raised to the holding section 2 by the operation of the elevating mechanism 15. Carriage 8 receiving rod 1
1 is engaged with the locking portion 18 from below. Thereafter, the opening 5 may be opened using the lid 6, and the heated material a inside the holding section 2 may be mechanically or manually taken out to the outside.

In this way, the material to be heated a is placed on the table 7 formed extending to the lower end of the opening 5 provided on the side surface of the holding section 2, and then vacuum heated from the holding section 2. It is placed on a carrier 8 and moved to the chamber 3 and the cooling section 4, and is sufficiently heated in the vacuum heating chamber 3.
The powder is effectively cooled and hardened by the flowing powder in the cooling section 4, and then returned to the holding section 2.

The vacuum heating device of the present invention described above is an embodiment, and can be modified in any manner without departing from the scope of the claims.

<Effects of the Invention> In summary, according to the vacuum heating device of the present invention,
Since we adopted a method in which the material to be heated under vacuum is cooled with flowing powder, quenching can be performed based on sufficient cooling capacity. Since no oil is used in the cooling section, there is no need to contaminate the vacuum heating chamber with oil or reduce heating efficiency, and there is no need to remove oil adhering to the heated material.

Furthermore, in the operation of the vacuum heating device of the present invention,
The operator simply places the material to be heated on the table, the heat treatment is accomplished by the machine's mechanical procedure, and the material is returned to the table. Therefore, the safety of workers during hardening work can be ensured,
Moreover, it has high workability and is easy to operate.

Therefore, the vacuum heating apparatus of the present invention provides extremely efficient heat treatment with high practical value.

[Brief explanation of drawings]

The drawings show an embodiment of the vacuum heating device of the present invention, in which Fig. 1 is a schematic vertical cross-sectional view, Fig. 2 is a vertical cross-sectional side view of the same, Fig. 3 is a cross-sectional plan view, and Fig. 4 is a partial view. FIG. 1... Vacuum heating device, 2... Holding section, 3... Vacuum heating chamber, 4... Cooling section, 23... Gas distribution plate,
24...Gas inflow chamber, 25...Connection duct, 26
...Blower, 27...Heat-resistant powder.

Claims (1)

[Claims] 1. Heating chambers are arranged side by side on one side of the airtightly closed holding section, and a cooling section is arranged below, and an opening that can be opened and closed by a lid material is formed on the side of the holding section facing the heating chamber. A table is extended outward from the lower edge of the opening, and a fork-shaped platform with wheels on the side is positioned between the above-mentioned holding section and cooling section, and can be moved up and down by a lifting device. The above-mentioned wheels are engaged with guide rails provided opposite to the above-mentioned lifting frame to support the carriage so as to be able to run, and the above-mentioned guide member provided at the tip of the operating mechanism provided under the above-mentioned table is connected to the upper end of the above-mentioned guide member. A receiving cart is supported detachably from below, and the material to be heated placed on the table is supplied to the heating chamber by the expansion and contraction action of the operating mechanism while the material to be heated is placed on the receiving cart, and the material to be heated is heated. Furthermore, the material to be heated that has been heat-treated in the heating chamber is placed on the carrier by the expansion and contraction action of the operating mechanism and positioned in the holding section, and the elevating frame is positioned together with the carrier in the cooling section by the elevating mechanism, and the material to be heated is placed on the carrier and positioned in the cooling section. cool down,
A vacuum heating apparatus characterized in that the carrier is then raised to a holding section by a lifting mechanism to move the material to be heated to a table.