JP3516906B2 - Heat treatment system and solution transfer method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system including a heat treatment apparatus having a quenching tank, a tempering oil tank, a cleaning tank and the like.

[0002]

2. Description of the Related Art In conventional batch type vacuum quenching furnaces and atmosphere quenching furnaces for quenching products, it is necessary to quench the products in an non-oxidizing atmosphere. The quenching process is performed. Therefore, in a heat treatment plant of a certain scale or more, it is necessary to provide a plurality of such heat treatment devices and fill the quenching oil into each quenching tank.
It was necessary to always store a large amount of quenching oil. Also, if quenching treatment is performed using such quenching oil, the quenching oil attached to this product must be washed after that, so a washing tank must be installed in accordance with the number of heat treatment equipment. Then
Further, it was necessary to store the cleaning liquid.

[0003]

However, such quenching oils and tempering oils often use dangerous substances such as No. 4 petroleum, and the total amount of the dangerous substances is limited. Without that, it had to be thoroughly stored and managed.
Also, cleaning liquids for cleaning quenching oils and tempering oils often use harmful substances, and there is a problem in that the total amount must be suppressed as much as possible in terms of environmental measures.

In view of the above problems, an object of the present invention is to provide a heat treatment system that reduces the total amount of quenching oil, tempering oil, cleaning liquid, and the like.

[0005]

Therefore, in order to solve the above problems, the present invention has a solution tank for storing a solution used for quenching / tempering treatment or cleaning treatment after quenching / tempering. A plurality of heat treatment equipment for quenching / tempering or cleaning treatment of the processed material and storing the same solution in the plurality of heat treatment equipment
A heat treatment system comprising a connecting means for connecting a plurality of solution tanks to each other ,
A transfer for transporting the solution used for the quenching / tempering treatment or the cleaning treatment between the plurality of heat treatment apparatuses via the connecting means, the solution being provided with an amount smaller than the total amount that can be stored in all of the plurality of solution tanks. A means is provided and it comprises. Since it is configured in this way, even when using quenching oil or tempering oil, cleaning liquid in a plurality of heat treatment devices, these quenching oil or tempering oil,
Dangerous substances such as cleaning liquid and harmful substances can be reduced.

If such a transfer means is configured to transfer the solution by setting the pressure of the solution tank on the side receiving the solution relatively low, a transfer pump is provided in the middle of the connecting means. There is no need. In particular,
In the vacuum furnace, since the pressure difference can be easily given by the vacuum pumps installed in each, this system can be introduced without requiring a special device.

Further, when the quenching oil, the tempering oil, and the cleaning liquid are transferred using such a system, the use time of the solution is set in advance, and the time slightly before the use time is reached. If the solution is transferred to another solution tank via the connecting means, it is possible to save labor in transferring the solution.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic structure of a heat treatment apparatus A capable of cooling a heat-treated product 7 with oil or gas. The heat treatment apparatus A takes in the processed material 7 placed on the lifter 6 and heats it, and cools it using oil or gas. This heat treatment apparatus A includes a heating chamber 2 for performing a heat treatment on a processed object 7.
And a cooling chamber 5 for cooling the processed material 7 heated to a predetermined temperature in the heating chamber 2 and held for a predetermined time.

The cooling chamber 5 has a lifter 6 on the front thereof.
An openable and closable outer door 1 is provided for carrying in the processed product 7 placed on, and a gas stirrer 14 is provided above the inside of the outer door 1 for cooling the heated processed product 7 with gas.
Further, a quenching tank 4 for quenching using quenching oil 9 is provided below it. Further, a vacuum pump P1 for adjusting the internal air pressure of the cooling chamber 5, a gas tank or a gas cylinder (not shown) required for gas cooling, and the like can be appropriately connected to the cooling chamber 5. Further, a quenching tank 4 is provided below the cooling chamber 5 so that a quenching oil 9 composed of a fourth petroleum or the like can be put therein, and the quenching oil 9 is placed on the processed product elevator 11. The processed material 7 is immersed in the quenching oil 9. Further, in the quenching tank 4, a liquid level detection sensor, a pressure sensor, etc. for detecting the amount of the quenching oil 9 are appropriately provided inside, and the quenching oil 9 is transferred to another heat treatment apparatus. For this purpose, a cylindrical connecting pipe 8 or the like is attached.

On the other hand, at the intermediate height position of the cooling chamber 5,
An openable and closable intermediate door 13 connected to the heating chamber 2 is provided. By opening and closing the intermediate door 13,
To be transferred.

The heating chamber 2 is for subjecting the processed material 7 transferred from the cooling chamber 5 to a heating treatment, and a heater 3 such as a graphite heater provided around the heating chamber 2 is provided.
Is used to heat the processed product 7. Further, the heating chamber 2 can be connected to a vacuum pump P2 for adjusting the internal air pressure, a gas tank or a gas cylinder (not shown) for filling gas, and the like.

FIG. 2 shows a plurality of states of the plurality of heat treatment apparatuses configured as described above. In FIG.
8 is a connecting pipe 8 shown in FIG. 1 connected to the quenching tank 4,
The heat treatment apparatus A has the same structure as that of the heat treatment apparatus A and is connected to the quenching tank 4'of the heat treatment apparatus B which is equivalent to or has a small size to the heat treatment apparatus A. The connecting pipe 8 is provided with a large solenoid valve 10a on the heat treatment apparatus A side, and a large solenoid valve 10c and a small solenoid valve 10d in parallel with the large solenoid valve 10c at a substantially intermediate point between the heat treatment apparatus B, Further, a small solenoid valve 10b is provided just before the quenching tank 4'of the heat treatment apparatus B. These solenoid valves 10a to 10b are configured so that the valves can be controlled to be opened and closed by an electromagnetic coil or the like, and these solenoid valves 10a to 10b can be controlled using a sequence controller or the like. is there. A connecting pipe 8'for manually transferring the quenching oil 9 is provided on both sides of the quenching tanks 4 and 4'in case of emergency.
In addition, the manual valves 11a to 11d that can be opened and closed manually and the transfer pump Px are provided. Among the manual valves provided in this way, the manual valves 11a and 11d are set so as to be closed in a normal state.
b and 11c are set to the open state. When the quenching oil 9 is transferred in the normal state, the solenoid valve 10
a, 10b, 10c are opened, and the quenching tank 4'side is set to a relatively low pressure by the pump P1 '(pump corresponding to P1 in FIG. 1) provided in the quenching tank 4', whereby Transfer quenching oil 9. Then, after transferring the quenching oil 9 in a substantially specified amount, the electromagnetic valve 10c is closed and the flow rate is finely adjusted by the electromagnetic valve 10d so that the quenching oil 9 is gradually transferred until the specified amount is reached.

FIG. 4 shows steps relating to the heat treatment of the heat treatment apparatus A and the heat treatment apparatus B, and schematically shows a flow stored in a sequence controller (not shown). Further, FIG. 3 is an enlarged view of one cycle in the heat treatment apparatus A and the heat treatment apparatus B. In the case of vacuum oil quenching, the load 7 carried into the heat treatment apparatus A or the heat treatment apparatus B in such a process is
It is processed as follows.

That is, first, the object to be processed 7 is placed on the elevator 11 for objects to be processed, carried into the heating chamber 2 through the cooling chamber 5, the intermediate door 13 is closed, and the inside of the heating chamber 2 is pumped by the pump P2.
To make a vacuum. Then, the heater 3 is gradually heated to raise the temperature of the processed product 7 (temperature raising process), and when the temperature reaches a certain temperature, the entire processed product 7 is soaked (soaking process), and again. The temperature is raised and maintained at a temperature suitable for quenching for a certain period of time (quenching temperature retention treatment). After that, while making a gas flow from the heating chamber 2 to the cooling chamber 5 with an inert gas having a predetermined pressure, the processed product 7 is taken out from the heating chamber 2 and placed on the processed product elevator 11 so that the processed product 7 can be cooled. Soak inside (quenching treatment). After the processed product 7 is completely cooled, the processed product 7 is lifted up to the vicinity of the outer door 1 so that the processed product 7 can be taken out, and the outer door 1 is opened to take out the processed product 7. Further, when the same treatment is performed by the heat treatment apparatus B or another heat treatment apparatus, the quenching oil 9 of the heat treatment apparatus A is controlled by using a control such as a sequence controller slightly before the time when the quenching oil 9 is used. Heat treatment equipment B
Alternatively, it is transferred to another heat treatment apparatus.

In this step, specifically, when heating / quenching with a large heat treatment apparatus A, the quenching process is started 220 minutes after the heating and taken out about 30 minutes after the heating, and the heating is started. About 260 minutes is set as one cycle until the next heat treatment. On the other hand, when heating / quenching is performed by the small heat treatment apparatus B, the quenching process is started 170 minutes after the heating and taken out about 30 minutes after that, and one cycle from the start of heating to the next heat treatment is about 220
The minutes are set. Therefore, in the first first cycle, the quenching oil 9 can be used mutually since the small heat treatment apparatus B and the large heat treatment apparatus A do not have the batting time for using the quenching oil 9. However, when the quenching oil 9 is continuously used in this cycle, as shown in FIG. 5, the quenching oil use time in the fifth cycle of the heat treatment apparatus A and the quenching oil in the sixth cycle of the heat treatment apparatus B are used. The time of use overlaps, and the quenching oil 9 cannot be used at the same time. Further, not limited to this case, there may be a case where the processing steps are changed due to the thickness of the material to be processed and the quenching oil use times overlap. In such a case, for example, as shown in FIG. The heating start time in the fifth cycle is delayed by α hours. By doing so, it is possible to prevent batting of the use time of the quenching oil 9. In addition, when batting occurs, other than the measure for delaying the heating start time, a method of loosening the rate of increase in heating of the processed material 7 and heating for a long time, or a processed material 7
It is also possible to take measures such as a method of extending the soaking time for the steel, a method of extending the holding time of the quenching temperature within the minimum limit, and the like.

In the above embodiment, the method of transferring the quenching oil 9 between the two heat treatment apparatuses A and B has been described, but in addition to this, the quenching oil 9 is transferred between the three heat treatment apparatuses. You can also do it. In this case, it can be configured by using the second embodiment as shown in FIG. That is, when the quenching oil 9 is transferred between the heat treatment apparatuses A, B, and C, a large solenoid valve 12d and a small solenoid in parallel therewith are provided at an intermediate point between the heat treatment apparatus on the transfer side and the heat treatment apparatus on the receiving side. Solenoid valve 12e is provided, and solenoid valves 12a to 12c are provided adjacent to each heat treatment apparatus. Then, for example, when the quenching oil 9 is transferred between the heat treatment apparatus A and the heat treatment apparatus B, the solenoid valves 12a and 12b are opened and the solenoid valve 12d is opened to quench each of the quenching oils 9 in a substantially prescribed amount. Transfer using the pressure difference in the tank. Then, the electromagnetic valve 12d is closed to open the electromagnetic valve 12e for fine adjustment, and the quenching oil 9 is gradually transferred to a specified amount.

Similarly, when the quenching oil 9 is transferred between the heat treatment apparatus A and the heat treatment apparatus C, the solenoid valve 12 is used.
a, 12c and solenoid valves 12d, 12f are opened (others are closed). Then, after the quenching oil 9 of a substantially specified amount is transferred, the electromagnetic valve 12d is closed and the solenoid valve 12e is opened, and the hardening oil 9 is transferred to the specified amount while performing the fine adjustment.

When the quenching oil 9 is transferred between the heat treatment apparatus B and the heat treatment apparatus C, the solenoid valves 12b and 12c and the solenoid valves 12d and 12g are opened (others are closed). Then, after the quenching oil 9 of a substantially specified amount is transferred, the electromagnetic valve 12d is closed and the solenoid valve 12e is opened, and the hardening oil 9 is transferred to the specified amount while performing the fine adjustment.

In the second embodiment also, in preparation for an emergency, each heat treatment apparatus is provided with a manual valve, and the quenching oil 9 can be transported using the transport pump Py.

Further, in the above-mentioned embodiment, the quenching oil 9 is transferred by the pressure difference provided between the heat treatment devices, but in addition to this, the quenching oil 9 is transferred as shown in the third embodiment. It can also be configured using a pump. That is, as shown in FIG. 7, the solenoid valves 13 are provided on the side for injecting the quenching oil 9 and the side for delivering the quenching oil 9 to each of the heat treatment apparatuses A, B, C.
a to 13f are provided, and the quenching oil 9 is transferred using the transfer pump Pz. Specifically, any one of the solenoid valves 13a, 13b, 13c on the side for transferring the quenching oil 9 is opened and the solenoid valve 13 on the side for receiving the quenching oil 9 is opened.
Also open any of d, 13e, and 13f. Then, the transfer pump Pz is driven to forcibly transfer the quenching oil 9. As a result, even when the quenching oil 9 is transferred by using a simple heat treatment apparatus having no pump P1 in the heat treatment apparatus as shown in FIG. 1, one pump Pz is used.
The quenching oil 9 can be transferred by using.

As described above, according to the above-described embodiment, a plurality of quenching tanks are connected by the connecting pipe 8, and the quenching oil 9 is less than the total amount that can be stored in all of these quenching tanks. The total amount of the quenching oil 9 can be reduced because it is transferred by the connecting pipe 8 so as to be shared. Therefore, even if the total amount of dangerous substances such as the quenching oil 9 is regulated, the heat treatment device can be additionally installed.

In the above embodiment, the case where the quenching oil 9 is transferred has been described, but the present invention is not limited to this, and a cleaning liquid for cleaning the treated product 7 and a cleaning liquid for tempering oil. Also, the same configuration can be applied. That is, a cleaning tank or a tempering tank can be connected as shown in FIG. 7, for example, to transfer the cleaning liquid to another cleaning tank or to transfer the tempering oil to each tempering tank. Also in this case,
For example, a pressure difference may be provided between each cleaning tank or each tempering tank, and the solution may be transferred using this pressure difference. In this way, if the cleaning liquid and the tempering oil are configured to be shared by other devices, it is possible to reduce harmful substances required for environmental measures.

[0024]

The present invention is carried out in the form as described above, and has the following effects.

That is, the heat treatment system of the present invention has a solution tank for storing a solution used for quenching / tempering treatment or cleaning treatment after quenching / tempering, and quenches / tempers the treated product. a plurality of thermal processing apparatus for cleaning process, a thermal treatment system comprising a connecting means for connecting a plurality of solution tanks each other for storing the same solution in the plurality of heat treatment apparatus, before
The quenching / tempering process or the cleaning with the plurality of heat treatment apparatuses provided with a solution having a smaller amount than the total amount that can be stored in all of the plurality of solution tanks connected by the connecting means. Since a transfer means for transferring the solution used for processing is provided, even if quenching oil, tempering oil, or cleaning liquid is used in multiple heat treatment devices, the total amount of such dangerous substances and harmful substances is Can be reduced.

If such a transfer means is configured to transfer the solution by setting the pressure of the solution tank on the side receiving the solution relatively low, a transfer pump is provided in the middle of the connecting means. There is no need.

Further, when the quenching oil, the tempering oil, and the cleaning liquid are transferred using such a system, the use time of the solution is set in advance, and the solution is connected when the time corresponding to the use time is measured. If the solution is transferred to another solution tank via the means, labor saving of the solution transfer can be achieved.

[Brief description of drawings]

FIG. 1 is a schematic view of a heat treatment apparatus showing an embodiment of the present invention.

FIG. 2 is a diagram showing a connected state of the heat treatment apparatus in the same embodiment.

3 is a diagram showing one cycle of a heat treatment process of the heat treatment apparatus shown in FIG.

4 is a diagram showing a plurality of cycles of a heat treatment process of the heat treatment apparatus in FIG.

5 is a diagram showing a plurality of cycles of a heat treatment process of the heat treatment apparatus in FIG.

FIG. 6 is a diagram showing a second embodiment corresponding to FIG.

FIG. 7 is a diagram showing a third embodiment corresponding to FIG.

[Explanation of symbols]

A, B, C ... Heat treatment equipment 2 ... Heating room 4, 4 '... Quenching tank 5 ... Cooling room 8 ... Connection pipe 9 ... Quenching oil 10a-d ... Solenoid valve 12a-12g ... Solenoid valve 13a to 13f ... Solenoid valve

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiyuki Fujita, 13 Edison Hard Co., Ltd., Nakadouji, Shimogyo-ku, Kyoto (72) Inventor, Ryoji Fujino 13 Ed, Maedacho, Nakado-ji, Shimogyo, Kyoto (56) Reference: JP-A-5-202414 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C21D 1/02-1/84

Claims (3)

(57) [Claims] 1. A plurality of heat treatment apparatuses having a solution tank for storing a solution used for quenching / tempering treatment or cleaning treatment after quenching / tempering, for quenching / tempering treatment or cleaning treatment of processed products. When,
A thermal processing system comprising a connecting means for connecting a plurality of <br/> solution chamber between storing the same solution in the plurality of heat treatment apparatus may stored in the plurality of solution tanks all connected by said connecting means A heat treatment system, comprising a solution in an amount smaller than the total amount, and comprising transfer means for transferring the solution used for the quenching / tempering treatment or the cleaning treatment between the plurality of heat treatment apparatuses via the connecting means. 2. The heat treatment system according to claim 1, wherein the transfer means is a means for transferring the solution by setting the pressure of the solution tank on the side receiving the solution relatively low. 3. A plurality of heat treatment devices for quenching / tempering or cleaning a processed product having a solution tank for storing a solution used for quenching / tempering or cleaning after quenching / tempering. When,
And a connecting means for connecting a plurality of <br/> solution chamber between storing the same solution in the plurality of heat treatment apparatus, wherein the coupling means
A method for transferring a solution, which is used in a heat treatment system provided with a solution in an amount smaller than the total amount that can be stored in all of the plurality of solution tanks connected by, by setting the use time of the solution in advance and the set time. The method for transferring a solution, wherein the solution is transferred between the heat treatment apparatuses via the connecting means when the time corresponding to is measured.