JPH05117742A - Quenching apparatus - Google Patents

Abstract

PURPOSE:To provide a quenching apparatus which has high cooling control accuracy and can change cooling speed on the way of quenching. CONSTITUTION:At the side part of a carrying line for material 12 to be quenched, plural cooling vessels 16, 18 having the different cooling performances are arranged and by a control device 28, a manipurator 22 is driven through an air pressure cylinder device 38, rod-less band cylinder device 40, etc., and the material 12 to be quenched is held up from on a table 14 and dipped into the cooling vessels 16, 18 in order by the set time to execute the cooling in the complicated cooling condition at the high accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quenching apparatus for rolling or heat treating a material and then cooling it according to a predetermined program.

[0002]

2. Description of the Related Art Conventionally, for cooling control during quenching of a material, a method of spraying a coolant on a material to be quenched and a method of immersing the material to be quenched in a refrigerant are well known.

[0003]

In the former method of injecting a refrigerant into a material to be hardened, the cooling condition is controlled by controlling the flow rate and the injection time of the refrigerant, so that the size of the material to be hardened is controlled. It is suitable for use in the case of a large value, but there is a problem in that the cooling control accuracy is not high.

In the latter method, in which the material to be hardened is immersed in a refrigerant, cooling can be controlled when the cooling rate is constant.
There is a problem that it cannot be applied under the quenching conditions in which the cooling rate is changed during quenching.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a quenching apparatus having a high cooling control accuracy and capable of changing the cooling rate during quenching. And

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a cooling tank group in which a plurality of cooling tanks having different cooling capacities are successively arranged adjacent to a line for conveying a material to be hardened, and a member on the conveying line. A manipulator for holding or releasing the hardened material, and a carrying device including a driving means for vertically driving the manipulator and laterally between the carrying line and the cooling tank, and the material to be hardened. According to the immersion time in each of the cooling tanks, a controller for controlling the vertical position and the horizontal position of the manipulator via the drive means, and a quenching device comprising To do.

[0007]

In the present invention, a plurality of cooling tanks having different cooling capacities are arranged, and the hardened material lifted by the manipulator is sequentially immersed in each cooling tank in accordance with the cooling condition to cool. The cooling time in each cooling tank, the control of the cooling temperature range is easy and highly accurate, and further, the material to be quenched between the cooling tanks can be moved accurately in a short time,
This makes it possible to accurately perform cooling under complicated cooling conditions.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings.

A quenching apparatus 10 according to this embodiment is shown in FIGS.
As shown in FIG. 4, adjacent to the table 14 consisting of a rolling mill run-out table or a heat treatment furnace exit side table on the conveying line of the material to be hardened 12, the elements are sequentially arranged in a direction orthogonal to the conveying line direction. A cooling tank group 20 composed of a first cooling tank 16 and a second cooling tank 18, a manipulator 22 for holding or releasing the material to be hardened 12 on the table 14, and a manipulator 22 driven up and down. And the transfer line and the first and second cooling tanks 1
The conveying device 26 including the driving means 24 that is laterally driven between 6 and 18, and the driving according to the immersion time of the material to be hardened 12 in the first and second cooling tanks 16 and 18. And a control device 28 for controlling the position of the means 24 and the vertical movement of the manipulator 22.

The first cooling tank 16 and the second cooling tank 1
Refrigerants having different cooling capacities 8 are filled with water, for example, water is put in the first cooling tank 16 and oil is put in the second cooling tank 18.

The manipulator 22 is a table 1
Lift the hardened material 12 horizontally arranged on the
It holds this in an upright state that has been rotated.

The driving means 24 straddles an arm 32 horizontally attached to the upper end of the support column 30, and is arranged so that it can be moved horizontally by a wheel 35 on a rail 34 provided on the upper surface of the arm 32. Trolley 36 and this trolley 3
6, a vertical pneumatic cylinder device 38 for supporting the upper end of the manipulator 22, which is provided vertically.
A rodless band cylinder device 40 which is attached to one side surface of the arm 32 and horizontally drives a carriage 36;
Is configured.

Reference numerals 42A, 42B and 42C in FIG. 4 respectively represent an air filter, a regulator and a lubricator for adjusting the compressed air supplied from a compressed air source (not shown) through the opening / closing valve 44.

Ports (not shown) at both ends of the pneumatic cylinder device 38 and the rodless band cylinder device 40.
Are respectively connected to solenoid valves 48 and 50 via a speed controller 46, and these solenoid valves 48 and 50 are respectively connected to the discharge side of the lubricator 42C. The control device 28 is configured to switch and control the solenoid valves 48 and 50 according to set conditions.

Reference numeral 52 in FIGS. 1 and 2 expands and contracts in accordance with the movement of the carriage 36, and the pneumatic cylinder device 3 for vertical movement.
8 shows a flexible tube for supplying compressed air.

Reference numeral 54 in FIG. 1 or FIG. 2 is a limit switch attached to the pneumatic cylinder device 38 for detecting whether or not the vertical position of the manipulator 22 has reached a preset height. 56 is the arm 32
On the side surface of the vehicle, there are shown optical sensors which are arranged at regular intervals in the horizontal direction and detect the horizontal position of the carriage 36.

The output signals of the limit switch 54 and the optical sensor 56 are both input to the control device 28.

Next, the operation of the quenching apparatus 10 according to the above embodiment will be described.

The table 1 is conveyed along the conveying line.
The material to be hardened 12 placed on the No. 4 is moved up and down by the pneumatic cylinder device 38, lifted by the manipulator 22, and the material to be hardened 12 is fixed in a state of being rotated by 90 °.

Next, the rodless band cylinder device 40
The manipulator 22 together with the carriage 36
It is moved horizontally on the cooling tank 16 until the optical sensor 56 detects it.

The manipulator 22 is the first cooling tank 16
When it reaches the upper side of the, the horizontal movement is stopped, and the manipulator 22 is lowered by the pneumatic cylinder device 38,
The material to be quenched 12 is immersed in the refrigerant in the first cooling tank 16 for a predetermined time.

After completion of the predetermined immersion, the pneumatic cylinder device 38 lifts the manipulator 22,
Further, the rodless band cylinder device 40 is moved to the next second cooling tank 18 as described above.

When the optical sensor 56 detects that the carriage 36 has reached above the second cooling tank 18, the horizontal movement is stopped, the pneumatic cylinder device 38 lowers the manipulator 22, and the hardened material 12 For a predetermined time, the second
It is immersed in the refrigerant in the cooling tank 18 and cooled.

After a certain immersion time, the material to be hardened 1
2 is pulled up and returned to the table 14.

In this process, the immersion time of the material to be hardened 12 in the first cooling tank 16 and the second cooling tank 18 is input to the controller 28 in advance.

Further, the vertical positioning of the manipulator 22 is automatically controlled by the preset value through the limit switch 54, so that only the start and the end of the immersion in each cooling tank are manually performed. ..

For manual control, the material to be hardened 1
The output from a thermocouple (not shown) that measures the temperature of 2 is A
/ D converted temperature value and immersion time in the cooling tank are digitally displayed.
Move up and down.

Here, in the case of computer control, a method of presetting the cooling time in each cooling tank 16 and 18,
There is a method of giving the cooling start and end temperatures in the respective cooling tanks 16 and 18. In the latter, the difference between the temperature measured during immersion and the target cooling end temperature is obtained, and that value is divided by the set cooling rate. By doing so, the remaining cooling time is calculated.

The cooling schedule by the apparatus of the above embodiment is as shown in Table 1, for example.

This schedule uses 10 stainless steels.
After heating to 50 ℃, in the first cooling tank 16 up to 800 ℃ 4
Cooling at a rate of ° C / S, then in the second cooling bath 18,
It cools from 0 ° C or less to 500 ° C at a cooling rate of 10 ° C / S. Table 1 compares the target value with the actual value.
It is shown in.

As another example, Table 2 shows a second cooling schedule.

According to this schedule, carbon steel is hot-rolled, finished at 1000 ° C., and cooled in the first cooling tank 16 to 9
Cooling from 00 ° C to 600 ° C at a rate of 15 ° C / S,
Next, in the second cooling tank 18, from 600 ° C to 300 ° C, 5
Cooling is performed at a rate of ° C / S.

Table 2 compares the target value and the actual value in this schedule.

As can be seen from the comparison between these cooling schedules and the actual values, it is understood that the quenching apparatus 10 of the present invention realizes complicated cooling conditions with high accuracy.

Although the above embodiment is provided with the first cooling tank 16 and the second cooling tank 18, the present invention is not limited to this, and cooling tanks having different cooling capacities are provided. It is sufficient if it is composed of a plurality of cooling tank groups.

Further, the cooling refrigerant is not limited to water or oil.

Further, in the quenching apparatus of the above embodiment, the air cylinder device is used as the drive source for moving the manipulator 22 up and down or horizontally, but the present invention is not limited to this, and a hydraulic cylinder is used. Other drive means such as a device, a chain, a rack may be used.

[0038]

TABLE 1 Cooling schedule stainless steel, t = 50 mm at between Minoru Shimegi record pressurized heat 1 hour 1050 ° C. 1050 ° C. the furnace → table → conveying device 5 seconds 1049 ° C. The first cooling chamber to 2 seconds 1048 ° C. The first stage Immersion 62.5 seconds ← 62.7 seconds Lifting 0.7 seconds 800 ° C 802 ° C Cooling rate 4.0 ° C / s 3.92 ° C / s Up to the second cooling tank 2 seconds 797 ° C Second stage immersion 30 seconds ← 30.3 seconds increase 0.8 seconds 500 ° C 496 ° C / s Cooling rate 10.0 ° C / s 9.93 ° C / s

[0039]

TABLE 2 Cooling schedules carbon steel, t = 15 mm at between Minoru Shimegi record rolling end 1000 ° C. 1000 ° C. Table → conveying device 5 seconds 995 ° C. The first cooling chamber to 2 seconds 993 ° C. hold 180 seconds 900 ° C. 903 ℃ 1st stage immersion 20 seconds 20.5 seconds raising 0.5 seconds 600 ° C 595 ° C cooling rate 15 ° C / s 15.02 ° C / s up to the second cooling tank 2 seconds 590 ° C immersion 60 seconds 59 seconds raising 0 0.5 seconds 300 ℃ 303 ℃ Cooling rate 5 ℃ / s 4.83 ℃ / s

[Brief description of drawings]

FIG. 1 is a schematic front view showing an embodiment of a quenching apparatus according to the present invention.

FIG. 2 is a plan view showing the device of the embodiment.

FIG. 3 is a side view of the apparatus of the embodiment.

FIG. 4 is a pneumatic circuit diagram including a partial block diagram showing a drive unit and a control unit in the apparatus of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Quenching apparatus, 12 ... Quenching material, 14 ... Table, 16 ... 1st cooling tank, 18 ... 2nd cooling tank, 20 ... Cooling tank group, 22 ... Manipulator, 24 ... Driving means, 26 ... conveying device, 28 ... control device, 34 ... rail, 36 ... carriage, 38 ... pneumatic cylinder device, 40 ... rodless band cylinder device, 48,50 ... solenoid valve.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiko Taniguchi 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Technical Research Headquarters (72) Inventor Tadashi Shimono 1 Kawasaki-cho, Chiba-shi Kawasaki Steel Co., Ltd. Research headquarters

Claims (1)

[Claims] 1. A cooling tank group in which a plurality of cooling tanks having different cooling capacities are sequentially arranged adjacent to a line for conveying a material to be hardened,
A manipulator for holding or releasing the material to be hardened on the transfer line, and a transfer device including a driving unit for driving the manipulator in the vertical direction and laterally between the transfer line and the cooling tank. And a controller for controlling the vertical position and the lateral position of the manipulator via the drive means in accordance with the immersion time of the material to be quenched in each of the cooling tanks. ..