JPS6143224Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for measuring the cooling capacity H value of a cooling liquid for quenching in a heat treatment process.

Conventionally, the cooling capacity of the cooling liquid for quenching (here, ``cooling capacity'' refers to the ``cooling capacity of the coolant used for quenching steel'' as defined by JISDO 201, etc.) To find out the H value (which represents the cooling rate of the agent itself), for example, select an appropriate test piece, and calculate the distance value from the quenched end by the single-end quenching method and the actual value of the distance from the quenched end of a round material of the same material by the cooling liquid. There have been many methods that involve complicated processing during the process, such as obtaining the effective quenching depth value that appears during quenching and estimating the H value of the coolant from that value.

The purpose of the present invention is to provide a measuring device that can immediately measure the cooling capacity H value by simply inserting it into a cooling liquid for quenching, without using such complicated means. It is something to do.

Hereinafter, the present invention will be explained based on the accompanying drawings showing embodiments thereof.

The measuring device according to the present invention consists of a detection section A shown in FIG. 1 and a measuring box B shown in FIG. 2. First, as shown in the cross-sectional view in FIG. A measuring element 3 for detection is arranged, and a tubular handle 5 is fixed to the container 1 via a heat insulating material 4, and a power line 6 to the heating element 2 and a power line 6 from the measuring element 3 are connected to the heating element 2 through the tubular part of the handle 5. The signal output line 7 is drawn out. The measurement box B, as shown in FIG. However, a buzzer aperture 14 and an indicator light 15 are arranged on the top surface, respectively, and a power line 6 and a signal line 7 from the detection part A can be connected to the side surface via connection fittings. A built-in switch 51, a power supply circuit 52,
A power cord line 16 for a time limit circuit 53, amplifying circuit 55, etc. (see FIG. 8) can be connected. In addition, FIG. 3 shows another embodiment of the measuring box B, and in this embodiment, instead of the pointer of the cooling capacity H value meter 11 in the embodiment shown in FIG. 2, a numerical display is used. This shows an example using the board 11'. In addition, inside measurement box B,
The cooling capacity H value meter 11, 11' is determined by the power supply circuit 52, time limit circuit 53, etc. (see Fig. 8) for sending heating power to the heating element 2 of the detection part A, and the signal output from the probe 3. It includes an amplifier circuit 55, an A/D conversion circuit 56, a digital display circuit 57, etc. (see FIG. 9) for operating the circuit.

The device of the present invention has the above configuration, but
Next, we explain its working principle and its measurement method in the fourth section.
This will be explained with reference to FIGS.

As shown in FIGS. 4, 8 and 9, the detection part A is immersed via the handle 5 into the cooling liquid Q of the quenching bath 20 containing the quenching cooling liquid to be measured. Also, connect the power cord line 16 of the measurement box B to the power supply V, and confirm that the power line 6 and signal output line 7 of the detection section A are connected to predetermined locations on the measuring device A and the measurement box B, respectively. In this case, as shown in FIGS. 8 and 9, the power obtained from the power cord 16 is divided between the switch 51 and the power circuit 52. Note that the heat generating element 2 is connected to the switch 51. Further, the power supply circuit 52 is a well-known power supply stabilizing circuit, and the power supply circuit 52 is connected to a time limit circuit 53 and an amplification circuit 55. In addition,
The solid lines in these figures represent power lines that supply power.

A start button 13 is connected to the timer circuit 53, and a signal line 7 indicated by a dotted line in the figure is connected to output to the switch 51, the amplifying circuit 55, the indicator light 15, and the buzzer 54. The amplification circuit 55 is connected to input the voltage signal obtained from the probe 3 via the fine adjustment knob 12, and is connected to output the amplified voltage to the H value meter 11. There is. The H value meter 11 uses a scale plate of a voltmeter for H value.

Next, the operation of one embodiment of the circuit shown in FIG. 8 will be described.

Insert the plug of the power cord wire 16 into the power outlet V. At this time, switch 51 is "open".
It is.

Now, insert the detection part A into the cooling liquid for quenching to be measured. At this time, the time t-axis in FIG.
The temperature θ° C. axis is located at the intersection “O”. Naturally, the needle P of the H value meter 11 shown in FIG.
is stopped at position 30.

Now, the start button 13 is pressed and the time limit circuit 53 is set to a preset time t ₀ , for example, t ₀ =1 min, and is activated.

A signal is output from the timer circuit 53 to the switch 51, the switch 51 becomes "closed", and the heating element 2 begins to generate heat. At the same time, a signal is also output to the amplification circuit 55, and a signal from the probe 3 is input thereto.

In Fig. 1, the heating element 2 generates heat and the container 1 is heated, but the outside is cooled by the quenching cooling liquid, so the temperature of the container 1 rises as the difference between heating and heat radiation. Then, the measuring element 3 measures the temperature of the container 1, and inputs a voltage proportional to the temperature to the amplification circuit 55. The amplifying circuit 55 amplifies the input voltage and outputs it to the H value meter 11, and the needle P swings in the X direction according to the voltage (Fig. 6) for a set time.
After _t0 has elapsed, the timer circuit 53 again outputs a signal to the switch 51, and the switch 51 stops supplying power to the heating element 2. At the same time, the indicator light 15 flashes,
The buzzer 54 is sounded for a while, e.g.
Continues to blink and sound for 10 seconds. The measurer only needs to read the position 31 of the needle P of the H value meter 11 during this time. This means that t ₀
This means that the temperature θ° C. of the container 1 after a certain period of time is measured, and that temperature is converted into an H value, and the converted value to which the temperature corresponds is directly read.

FIG. 9 shows another embodiment of a circuit for digitizing the display of the H value to display a numerical value.

In FIG. 8, the output signal from the amplification circuit 55 is directly connected to the H value meter, but in the case of FIG. 9, the output signal from the amplification circuit 55 is connected to a well-known A/D conversion circuit. It converts the analog voltage value into a digital code and outputs it. This digital signal is input to the digital display circuit 57, and a drive signal is output to the numerical display panel 11' so as to display the corresponding numerical value. The numerical display board 11' is
By inputting the signals, the corresponding characters (numbers) are constructed and displayed.

Next, FIG. 10 shows another embodiment in which the amplifier circuit 55 and subsequent parts are constructed with digital circuits. The AND circuit 64 is connected to input the signal from the amplifier circuit 55 and the signal from the sawtooth wave generation circuit 61 to the control current generation circuit 62. It is connected to input the signal from. This sawtooth wave generation circuit 61, control current generation circuit 62,
A differential circuit C includes a clock pulse generation circuit and an AND circuit 64. This differential circuit C
The output of the comparator circuit 65 is connected to be inputted, and the output of the comparator circuit is connected to be inputted to the counting circuit 66, and thereafter, the digital display circuit 57.
and a numerical display panel 11' are connected in series.
Note that 42, 46, 47, 48, and 49 in FIG. 10 represent signals flowing through the respective signal lines, which are the same as each signal in FIG. 7.

The circuits illustrated in FIGS. 8, 9, and 10 are conventionally well-known circuits, and are shown as examples of circuits applied to the embodiments of the present invention.

By the way, FIG. 5 shows the signal obtained through this signal output line 7, that is, the detected container 1.
The relationship between temperature θ and time t is expressed as temperature θ and time t
are shown in an orthogonal coordinate system with vertical and horizontal axes, respectively. For a coolant with a certain H value, the heating of the heating element 2 and the heat radiation from the container 1 Therefore, the temperature θ increases with time t. For example, if the detected temperature is θ ₀ °C after time t ₀ , a curve as shown by 20 in FIG. 5 is drawn, and from this the H value is is required. If the cooling capacity of the coolant Q is high, the amount of heat dissipated will further increase, and the temperature of the container 1 will not rise, following the course shown by the curve 21 in FIG. 5, and at time t ₀
After passing through, it shows only θ ₁ °C, which is lower than θ ₀ °C. On the contrary, when the cooling capacity is low, the amount of heat dissipated is also small, and the temperature of the container 1 rises, reaching approximately θ ₂ °C after time t ₀ and drawing a curve 22 with a high slope.
Therefore, if the temperature θ after time t ₀ is known, the corresponding H value can be obtained. For this purpose, after the start button 13 is pressed down, the timer circuit 53 in the measuring box B
When the time t ₀ has elapsed, a timer is activated, the power supply to the heating element 2 is stopped, and at the same time a buzzer sounds for a certain period of time and the indicator light 15 is made to blink. Therefore, it is only necessary to read the indications of the cooling capacity H value meters 11, 11' during this time. Now, an example of the scale plate of the pointer-type cooling capacity H value meter 11 is shown in Fig. 6.
It is shown that the movement of this hand P starts from position 30 in the direction of arrow X and stops at position 31 after time t ₀ . In addition, in FIG. 6, the measured H value indicates 0.3 as an example. If you want to measure again, press the start button 13 after the needle P has returned to position 30. In this case, by keeping the heat capacity of the container 1 small, the needle P can be converged to the position 31 in a short time after the heating element 2 stops heating. Further, while the buzzer 54 is sounding and the indicator light 15 is blinking, the heat generation increase inertia amount and the heat radiation amount of the heating element 2 are in an equilibrium state, that is, the container 1 and the heating element 2 each have their own heat capacity and heat transfer. Therefore, if the time t ₀ is selected so that the temperature difference remains for a while without any sudden change immediately after the heating element 2 stops heating, the hand P will temporarily move. It is stopped, so you only need to read the scale during this time.

Next, an example of measurement using another method will be explained. As explained with reference to FIG _. 5, the detection results from the probe 3 draw, for example, a curve ₂₀ with time t. ) was converted into an H value. By the way, it is immediately clear from FIG. 5 that the H value is a measurement of the slope of the curve 20, etc. Based on this, FIG. 7 shows a known differential circuit C in the circuit inside the measuring box B.
10 (see FIG. 10) and illustrates the operation of the signals in the circuit for reading the gradient. 0 potential 4 of waveform 40 obtained from sawtooth wave generation circuit 61
1, create a pulse (waveform) 42, and
The signal from the waveform 40 obtains a waveform 43, a point 44 at the same level as the waveform 40 creates a pulse (waveform) 45, and a control current 46 is created between the pulses 42 and 45.
On the other hand, a constant pulse (waveform) 47 with accurate equal intervals is obtained from the clock pulse generation circuit 63, and this is ANDed.
A group of pulses of waveform 48 is obtained by passing control current 46 through the circuit only while it is flowing. Then, the difference between this pulse group 48 and the previous pulse group is obtained through the comparator circuit 65 as a pulse group of waveform 49, which is counted and converted into an H value, which is displayed on the numerical display panel 11' of the measurement box B. I'll do what I do. Note that it is also possible to represent the value on the pointer-type H value meter 11 using a known DA conversion circuit without using such an H value conversion circuit.

Here, for reference, we will explain the relationship between the cooling capacity and the rate of temperature rise and the relationship between the rate of temperature rise and the amount of power supply when measuring the cooling capacity with the device of the present invention. do.

First, there is a correlation between cooling capacity and temperature rise rate. That is, as explained above, a liquid with a large cooling capacity shows a course like the curve 21 in FIG. 5, and a liquid with a small cooling capacity shows a course like the curve 22. That is, the heating element 2 having a constant calorific value
If it is put into the quenching coolant Q, if the cooling capacity of the liquid is large, the difference between the amount of heat generated and the amount taken away is small, and even at time t ₀ , the temperature of the contact point 3 is The temperature in the vicinity does not rise much, so the fifth
The course is as shown by the curve 21 in the figure. On the other hand, if the cooling capacity of the liquid is small, the opposite effect will occur.

Next, regarding the relationship between the rate of temperature rise and the amount of power supplied, this is not relevant in the present invention. In other words, the standard temperature increase rate is, for example, since the cooling capacity H value of stationary water is generally determined to be 1.0 at 18°C, the heating element 2 having a certain calorific value is arbitrarily set to 18°C. When water at ℃ is heated for an arbitrary fixed time t ₀ , the temperature detected by probe 3 is θ
Assuming that the temperature was ₀ °C, the pointer position at θ ₀ °C may be determined as the measured H value of 1.0. in this way,
If an arbitrary heating element is set, for example, the heating element 2 whose standard is easy to set, the resistance value will not fluctuate and the amount of power supplied will be determined by itself. It should be noted that detailed descriptions of the various functional circuits in the measurement box B will be omitted in this specification since it is easy for those skilled in the art to design appropriate circuits as needed.

As explained above, by using the device for measuring the cooling capacity H value of quenching coolant according to the present invention, the H value can be measured easily and within a short time without using the conventional complicated method. As a result, the heat treatment process can be reliably controlled and productivity can be further improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the detection section of the measuring device according to the present invention, and FIG. 2 is a perspective view of an embodiment of the measuring box of the measuring device according to the present invention, which is equipped with a pointer H value meter.
Fig. 3 is a perspective view of another embodiment of the measuring box equipped with a numerical display panel, Fig. 4 is an explanatory diagram showing the main points of measurement operation using the device of the present invention, and Fig. 5 is a diagram obtained from the measuring head of the detection section. A diagram showing signal waveforms in a time-temperature rectangular coordinate system, Figure 6 is a front view showing the scale plate of a pointer-type H value meter, and Figure 7 shows various waveforms in the circuit for obtaining the slope of the output waveform curve. Fig. 8 is a circuit diagram showing each circuit in the detection part A and measurement box B, and their wiring, and Fig. 9 is a digital conversion circuit diagram in measurement box B when numerically displayed. , FIG. 10 is a circuit diagram showing the differentiating circuit, comparison circuit, and counting circuit in the measurement box B when the output waveform of FIG. 7 is used to display numerical values. 1. Container; 2. Heating element; 3. Measuring head; 1
0...Box body; 11, 11'...H value meter; 12...
Fine adjustment knob; 13...Start button; 51...
Switch; 53... Time limit circuit; 55... Amplifying circuit; 56... A/D conversion circuit; 57... Digital display circuit; 62... Control current generation circuit; 6
4...AND circuit; 65...Comparison circuit; 66...
Counting circuit.

Claims (1)

[Claims for Utility Model Registration] 1 Consists of a detection part A and a measuring box B, where the detecting part A is composed of a container 1 with a small heat capacity containing a heating element 2 and a temperature detection probe 3, and the measuring box B
H value meter 11 or H value numerical display board 1 on one side
1', and includes a power supply circuit 52, a time limit circuit 53, an amplification circuit 55, or in addition to the above three circuits, an A/D conversion circuit 56 and a digital display circuit 57, and a heating element of the detection part A. 2 and measurement of the cooling capacity H value of the quenching coolant formed by connecting the temperature detection probe 3 to the power supply circuit 52 and the amplification circuit 55 in the measurement box B via the power line 6 and the signal output line 7, respectively. Device. 2. The measuring device according to claim 1 of the utility model registration, in which one or both of the buzzer 54 and the indicator light 15 are connected to the timer circuit 53 in the measuring box B. 3. The measuring device according to claim 1 or 2 of the utility model registration, which includes a differentiating circuit C in the measuring box B, and displays the signal output from the detecting section A numerically on the H value display panel 11'.