JP3093514B2 - Roll quenching control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for automatically quenching a roll heated in a heating furnace in a roll manufacturing facility.

[0002]

2. Description of the Related Art Conventionally, in a quenching operation of a roll, the surface temperature of the roll is intermittently measured by a manual radiation thermometer while the roll heated in a heating furnace is placed on a turntable and rotated. According to the measured value, the nozzle for mixing air and water and spraying the spray is manually opened and closed, and the operation of the cooling fan is controlled.

However, the quenching pattern of the roll differs depending on the roll standard, and the pattern is extremely complicated with dozens of types. At present, it is performed by the experience of a skilled person.

[0004] As described above, since the monitoring of the surface temperature and the operation of supplying an appropriate amount of cooling water, which greatly affect the quality of the roll, are determined by the skill of the operator, there is a problem that the quality is not stable. In addition, continuous measurement of the surface temperature with high accuracy was difficult due to the scale of the roll surface and the presence of water vapor. Also, as for the cooling method, while intermittently measuring the surface temperature of the roll as described above, the amount of cooling water is manually adjusted so as to approach the target pattern, but it depends on the intuition of the operator. However, there are drawbacks that the work is greatly affected by individual differences and that the work tends to be complicated due to the high temperature atmosphere.

[0005]

SUMMARY OF THE INVENTION In view of the above, the present invention solves the above-mentioned problems of the prior art, and continuously and automatically measures the roll surface temperature and cools according to a target pattern. Remote control.

[0006]

That SUMMARY OF THE INVENTION The present invention includes a plurality of cooling nozzles having a solenoid valve or flow regulation valve located in a position directed to the heating roll, established the <br/> radiation near the heating roll and a thermometer, further temperature transducer that is connected to the radiation thermometer, in advance, the shape for a number of rolls intended for quenching, temperature conversion is set input and storing the optimal cooling program pattern corresponding to each material, etc. standards Signal from vessel
Program controllers for adjusting the controlled cooling operation of the solenoid valve or flow regulation valve receiving relay unit, in a more becomes low <br/> Le hardening controller and configured control mechanism from the relay sequence circuit or the like, A solenoid valve or flow connecting to a relay sequence circuit at a position facing the heating roll
A plurality of cooling fans with a valve control are arranged, the radiation thermometer is arranged in a cylinder having an air purge means, and a majority filter for stably controlling a signal at the temperature converter is provided. Roll quenching control device.

[0007]

The present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing the configuration of the present invention, and FIGS. 2 and 3 are explanatory diagrams showing the implementation of control according to the present invention. That is, in the present invention, a thermometer 2, a plurality of cooling fans 3, and a plurality of cooling nozzles 9 for ejecting a spray of a mixture of air and water are arranged opposite to the roll 1 to be quenched. on the other hand,
The control mechanism 10 for controlling the quenching operation of the roll 1 includes:
A temperature converter 4, a filter 5, a program controller 6, a relay unit 12, and a relay sequence circuit 7 are connected in series, the radiation thermometer 2 is connected to the temperature converter 4, and a cooling fan 3 and a mist solenoid valve 8 are connected. Is connected to the relay sequence circuit 7. The program controller 6
An optimum cooling program pattern corresponding to a number of rolls for each standard such as shape and material is set and stored. Each of the cooling nozzle 9 and the fan 3 may be provided with an electromagnetic valve, so that the supply of the cooling medium can be controlled. This solenoid valve may be replaced by a flow regulating valve, and either the cooling nozzle 9 or the cooling fan 3 may be provided, or one of them may be operated to control the cooling. In FIG. 1, reference numeral 11 denotes a recorder for recording a temperature signal of the temperature converter 4.

Since the present invention is configured as described above,
First, an optimum cooling program pattern is determined in accordance with the specification of the roll to be quenched, input to the program controller 6, set and stored. Further, the surface temperature of the roll 1 to be quenched is measured by a thermometer 2, for example, a radiation thermometer,
The measured value is input to a temperature converter 4, converted into a control signal, and temperature fluctuation is stabilized by a majority filter 5, and then input to a program controller 6. The program controller 6 selects a preset optimal cooling program, and controls the operation of the relay sequence circuit 7 on and off according to the pattern. As a result, the relay sequence circuit 7
The spraying electromagnetic valve 8 is controlled by the operation of, and the spray amount injected from the cooling nozzle 9 toward the roll 1 is adjusted. Here, the cooling control by spraying will be described. This control is based on a set value (S
V) and the actual temperature (PV) measured by the radiation thermometer 2
Is performed through the relay unit 12 in a plurality of steps as necessary. The control by the cooling fan 3 can be performed in a step different from or in combination with the mist cooling as necessary, and a relay sequence circuit based on an on-off pulse signal output from the program controller 6 to the relay sequence circuit 7 The operation of Step 7 is appropriately selected and executed for each step. It is preferable to issue an alarm when the actual temperature deviates significantly from the set pattern.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of spray injection cooling nozzles 9 having an electromagnetic opening / closing valve 8 and a cooling device provided with a cooling fan 3 provide:
The roll heated above the A ₁ transformation point was quenched by the following method. With the system shown in FIG. 1, the surface temperature of the roll is sequentially detected by a thermometer 2 installed near the heated roll 1, the detected value is converted into an electric signal by a temperature converter 4, input. At this time, stable control is enabled by passing the signal from the temperature converter 4 through the majority decision filter 5. That is, when a scale is generated on the surface of the heating roll 1, the temperature detection value largely fluctuates due to the scale, so that the temperature fluctuates and the temperature becomes unstable. In order to solve this, the data of the temperature fluctuation caused by the scale is ignored and the previous value (the temperature before the abnormal drop) is held to stabilize. A radiation thermometer is used as the thermometer 2. The thermometer 2 is inserted into a cylinder, and water vapor is scattered by an air purge to measure the temperature while protecting and cooling the lens. The detected value input to the temperature converter 4 is output to the recorder 11.

The program controller 6 stores in advance a target cooling (quenching) control pattern for each of the various component systems and shapes of the roll, which is programmed in advance, and based on a signal input from the temperature converter 4, sets a target cooling (quenching) control pattern. The deviation between the set value and the actually measured temperature is calculated, the deviation control signal for the set target cooling program pattern is amplified through the relay unit 12 and transmitted to the relay sequence circuit 7 on and off for each step. Activate 7.

An on-off pulse signal from the relay sequence circuit 7 is simultaneously or selectively sent to the atomizing electromagnetic valve 8 and the electromagnetic valve for operating the cooling fan 3 to operate them, and the heating roll 1 is turned on by the program controller. The cooling is performed stepwise by a program based on the control signal from 6.

FIG. 2 shows the measured temperature (P) so that the heating roll 1 has a target set pattern (SV) indicated by a solid line.
This shows a pattern when the deviation from V) is controlled by cooling in four steps, and the cooling control is performed in five steps of spray cooling from DH1 to DH4 and fan cooling of DV. At this time, the solenoid valves (water supply valves No. 1 WMV to No. 4 WMV and air supply solenoid valve AMV) of the mist nozzle 9 used for each step are opened and closed (opening is indicated by hatching) and a fan is used. FIG. 3 shows an operation state of No. 3 (on is indicated by a dotted portion). That is, the actual cooling pattern (PV) of the heating roll is automatically approximated to the target setting pattern (SV) as shown in FIG. 2 by controlling the opening and closing of the solenoid valve and the on-off operation control of the fan in FIG. , And the target quenching was achieved.

[0013]

As described above, according to the present invention, a cooling pattern according to the roll standard is set in advance,
Since the quenching of the roll is controlled by the setting pattern, a stable product without individual differences can be obtained.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a system of the present invention.

FIG. 2 is an explanatory diagram showing an example of a cooling control pattern according to the present invention.

FIG. 3 is an explanatory diagram showing step cooling control in FIG. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 roll 2 radiation thermometer 3 cooling fan 4 temperature converter 5 majority filter 6 program controller 7 relay sequence circuit 8 solenoid valve for mist 9 cooling nozzle 10 control mechanism 11 recorder 12 relay unit

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takayuki Koya 46-59, Ohara Nakahara, Tobata-ku, Kitakyushu-shi, Fukuoka Nippon Steel Corporation Machinery & Plant Business Department (72) Inventor Yuzo Abe Yawata, Kitakyushu-shi, Fukuoka 2-56 Okura, Higashi-ku Yoshikawa Kogyo Co., Ltd. (56) References JP-A-4-308045 (JP, A) JP-A-2-197527 (JP, A) JP-B-57-45291 (JP, B2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) C21D 1/18 C21D 9/38 C21D 11/00 104

Claims (1)

(57) [Claims] 1. A plurality of cooling nozzles having a disposed at a position directed to the heating roll solenoid valve or flow regulation valve, a radiation thermometer placed near the heating roll, a temperature transducer further connected to the radiation thermometer In advance, for a number of rolls targeted for quenching, the optimum cooling program pattern corresponding to the shape, material, etc., for each standard is set and stored, and temperature change is performed.
Control mechanism comprising a program controller, a relay unit, a relay sequence circuit and the like for controlling the operation of the solenoid valve or the flow regulating valve in response to a signal from the heat exchanger and adjusting the cooling.
And a relay sequence circuit connected to a position facing the heating roll.
A plurality of cooling fans having an electromagnetic valve or a flow regulating valve are provided , the radiation thermometer is provided in a cylinder having an air purge means, and a majority filter for stably controlling a signal from the temperature converter is provided. Roll quenching control device, characterized in that: