JP4345033B1 - High frequency brazing apparatus and high frequency brazing method - Google Patents

Abstract

To provide a high-frequency brazing apparatus that brazes aluminum materials so that a reliable brazed product can be manufactured using a radiation thermometer.
Each time a unit time elapses from a base point including a calculation start temperature set based on the specification of a radiation thermometer, the controller 5 obtains a temperature difference between the measured temperature and the calculation start temperature, and from the base point to the present time. A first calculation operation for obtaining an integral value that takes into account the unit time of each temperature difference during the elapsed time, and a gradient of a linear function that takes the unit time starting from the base point by dividing the integral value by the elapsed time. 2 calculation operations, a third calculation operation for obtaining an estimated time for reaching the set temperature reaching the brazing set temperature from a linear function using a gradient, and a fourth calculation operation for sequentially repeating the first to third calculation operations, and a base point When the heating time from the time reaches the set temperature arrival expected time, a power stop command signal transmission function for stopping the power supply to the high-frequency heating coil 2 after a predetermined time after heating is provided.
[Selection] Figure 1

Description

  The present invention relates to improvement of a high-frequency brazing apparatus and a high-frequency brazing method, and more particularly to a high-frequency brazing apparatus and a high-frequency brazing method for brazing aluminum materials.

  In high-frequency brazing, since a part of the metal member to be brazed is heated by a high-frequency heating coil, it is difficult to equalize the metal material. Usually, the heating time is often controlled by a timer assuming that the heating amount is constant, but such a method naturally copes with the influence of the surrounding environment of the metal material and the change in the heating amount of the heating device. I can't. Therefore, the temperature of the brazing area of the metal member to be brazed was measured by the temperature sensor, and the brazing was completed when the brazing area reached the set temperature, so that reliable brazing would be possible. Attachment devices have been proposed. Hereinafter, an outline of the brazing apparatus according to this conventional example will be described with reference to FIG. 5 of a block diagram showing the apparatus.

  That is, the brazing device according to this conventional example controls the torch 55 positioned relative to the copper pipes 51 and 52, the pressure and flow rate of the heating gas, or the heating position of the torch 55. A heating control means 57 for controlling the temperature, an infrared radiation temperature sensor (infrared camera) 54 positioned relative to the copper pipe 51, and an image data processing means 56 for processing the detected temperature image data. In the image data processing means 56, the relationship between the temperature and the output voltage is first obtained from the captured image data by the preamplifier 56a and the main amplifier 56b.

  Then, the relationship is corrected by the emissivity of the copper pipe 51 at the time of melting set by the emissivity correction 56c, and linearized by the linearizer 56d to obtain temperature distribution data. This temperature distribution data is arithmetically processed by a temperature determination process 56e to determine brazing melting and output a brazing completion signal to the heating control means 57. Reference numeral 60 is a monitor that displays the temperature distribution data output from the linearizer 56d as an image, and reference numeral 53 is a brazing material.

Therefore, according to the brazing apparatus according to this conventional example, by setting the emissivity of the infrared radiation temperature sensor (infrared camera) 54 in the region 51b where the brazing of the copper pipe 51 spreads, it is easy to determine the melting of the brazing. be able to. As a result, an appropriate brazing completion signal can be output to the heating control means 57 , so that reliable brazing can be performed. In the brazing device according to the conventional example, torch brazing is described as an example, but it is also described that it can be applied to high-frequency brazing (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 06-285625

  According to the brazing apparatus according to the above-described conventional example, since brazing with reliability can be performed, it is considered that it is excellent as such. However, the metal material that can be brazed by the brazing apparatus according to this conventional example is limited to a metal material having a high emissivity, as described in the case of brazing a copper pipe. For example, when the metal material is an aluminum material, the emissivity is low, and the aluminum material is particularly susceptible to the influence of the measurement range, more specifically, the wax (brazing material), and the measurement temperature is not stable. This is because it cannot be applied to brazing each other.

By the way, it is said that according to the high frequency heating device, stable performance can be exhibited. However, depending on whether or not a ring-shaped brazing material is attached to the brazing part between the aluminum materials, the rising state of the temperature measured by the radiation thermometer in the brazing region by high-frequency heating indicates the temperature measured by the radiation thermometer on the vertical axis ( As shown in FIG. 4 of an explanatory diagram of an increase in temperature measured by a radiation thermometer of an aluminum material, in which the horizontal axis represents the heating time from the start of heating (unit: × 10 ⁻¹ s) on the horizontal axis. Thus, it was confirmed by a temperature rise state confirmation test that the difference was large.

  That is, when a ring-shaped brazing material is not attached to the brazing site between the aluminum materials to be brazed (two samples without brazing material), the temperature measured by the radiation thermometer is brazed as shown by the broken line in FIG. It rises in a state approximating a straight line until the set temperature is reached. However, when brazing material is attached (samples with brazing material: 2), the temperature measured by the radiation thermometer is affected by the heat energy due to high frequency heating, and the position of the brazing material changes or the emissivity changes. As shown by the solid line and the alternate long and short dash line in FIG. 4, the rising state greatly fluctuates in the rising process, and even if the dimensions and shapes of the aluminum materials are the same, The rise in measurement temperature is different.

In other words, the heating by the high-frequency heating device is local heating, and there is brazing material in the brazing region between the aluminum materials, and the emissivity changes due to the injection of flux from the brazing material or melting of the brazing material. It is thought that this is because the radiation thermometer that is generally used is affected. Therefore, if the temperature measured by the radiation thermometer is used as it is for the control of high-frequency brazing between aluminum materials, a large error occurs and reliable brazing cannot be performed.
However, in order to manufacture brazing products made of reliable aluminum materials at a lower cost, it is necessary to use a high-frequency heating device that uses the measurement temperature of a radiation thermometer from the viewpoint of improving productivity and stabilizing the quality. preferable.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a high-frequency brazing apparatus and a high-frequency brazing method for brazing aluminum materials so that reliable brazing products can be manufactured using a radiation thermometer. That is.

  From the following matters obtained from the tests conducted to solve the above problems, the inventors have found that the heating amount is stable even when the rising state of the measured temperature measured by the radiation thermometer fluctuates in a wavy manner. As a result, the high-frequency brazing apparatus and the high-frequency brazing method according to the present invention have been realized.

(1) When a temperature higher than normal is measured at the initial stage of heating, a temperature lower than normal tends to be measured at a later stage. On the other hand, a temperature higher than normal is measured, or a temperature lower than normal is measured. There is no such thing as being measured.
(2) The temperature when the brazing material is not attached to the brazing portion of the aluminum material rises while drawing a line that approximates a straight line as described above.
(3) Since the mass of the brazing material is very small compared to the mass of the aluminum material to be brazed, most of the high frequency heating energy is supplied to the aluminum material.
Therefore, the heating time required to bring the temperature of the brazing part of the aluminum material to the target brazing set temperature is obtained by determining the slope of the temperature rise straight line from all the information of the temperature measured by the radiation thermometer. Can be guessed.

In order to achieve the above object, the high-frequency brazing apparatus according to claim 1 of the present invention employs a high-frequency heating coil that heats a brazed portion of aluminum materials by supplying power from the high-frequency heating apparatus. A high-frequency brazing apparatus comprising a radiation thermometer that measures the temperature of the brazing region, and a control device that controls the high-frequency heating device based on the measured temperature measured by the radiation thermometer, wherein the control device, each time elapses unit time from the base point of the operation start temperature set based on the specification of the radiation thermometer, with determining the temperature difference between measured temperature and the operation starting temperature, from the base point to the current time A first calculation operation for obtaining an integral value that takes into account the unit time of each temperature difference during the elapsed time, and a value that is twice the integral value is divided by the square of the elapsed time. A second calculation operation for obtaining a gradient of a linear function taking the unit time from the base point as a starting point; and a third calculation operation for obtaining an estimated time for reaching a set temperature reaching the brazing set temperature from the linear function using the gradient. And performing a fourth calculation work that sequentially repeats the first calculation work to the third calculation work until the heating time from the base point reaches the set temperature arrival expected time obtained in the third calculation work, After the heating time from the base point reaches the set temperature arrival expected time, post-heat treatment is performed for a predetermined time with respect to the high-frequency heating device, and then the power for stopping the supply of power to the high-frequency heating coil There is a power stop signal transmission function for generating a stop signal.

Further, the means adopted by the high-frequency brazing method according to claim 2 of the present invention is that the brazing region is heated by a high-frequency heating coil while measuring the temperature of the brazing region between the aluminum materials with a radiation thermometer. In the high-frequency brazing method for brazing, every time a unit time elapses from the base point of the calculation start temperature set based on the specifications of the radiation thermometer, the temperature difference between the temperature measured by the radiation thermometer and the calculation start temperature is calculated. A first step of obtaining an integral value that takes into account the unit time of each temperature difference during the elapsed time from the base point to the present time, and a value that is twice the integral value as a square of the elapsed time. A second step of calculating a gradient of a linear function that takes into account the unit time starting from the base point by dividing, and when a set temperature is reached when the brazing set temperature is reached from the linear function using the gradient A fourth step that sequentially repeats the first to third steps until the actual heating time from the base point reaches the set temperature arrival expected time determined in the third step, After the heating time from the base point reaches the set temperature arrival expected time, post-heat treatment is performed for a predetermined time with respect to the high-frequency heating device, and then the power for stopping the supply of power to the high-frequency heating coil And a fifth step of issuing a stop signal.

In the high-frequency brazing apparatus according to claim 1 or the high-frequency brazing method according to claim 2 of the present invention, when brazing a brazed portion between aluminum materials, calculation starts set based on the specifications of the radiation thermometer. each time elapses unit time from the base point temperature, together with determining the temperature difference between measured temperature and the operation starting temperature by a radiation thermometer, for consideration of the unit time for each temperature difference in the elapsed time from the base point to the current time integral The value is calculated. The integral value corresponds to the high-frequency heating energy supplied to the brazing portion of the aluminum material during the elapsed time from the base point to the present time.

The gradient of the linear function is calculated by dividing a value twice the integral value corresponding to the high-frequency heating energy by the square value of the elapsed time, and taking into account the unit time starting from the base point. It becomes the average gradient of each gradient for each temperature rise line of the measured temperature for each unit time. Heating time by high-frequency heating coil from the base point reaches the said set determined from a linear function using an average gradient temperature estimated arrival time, whether the measured temperature of definitive to when it reaches the set temperature estimated arrival time Regardless of this, since the heating energy necessary to reach the brazing setting temperature is supplied to the brazing portion of the aluminum material, the actual temperature at the brazing portion of the aluminum material is the brazing setting temperature. Will be reached. After reaching the set temperature arrival expected time, after a predetermined time after heating, the supply of power to the high-frequency heating coil is stopped, and the brazing of the aluminum materials is completed.

  Therefore, according to the high-frequency brazing apparatus according to claim 1 or the high-frequency brazing method according to claim 2 of the present invention, the aluminum material is also high-frequency brazed based on the measured temperature measured by the radiation thermometer. Therefore, it becomes possible to manufacture a brazed product made of an aluminum material having excellent reliability.

  Hereinafter, a high-frequency brazing apparatus according to an embodiment of the present invention that performs the high-frequency brazing method of the present invention will be described with reference to the attached drawings. FIG. 1 is a schematic configuration explanatory view of a high-frequency brazing apparatus according to an embodiment of the present invention. FIG. 2 shows a measurement temperature by a radiation thermometer on the vertical axis and a heating time from the start of heating on the horizontal axis. It is brazing control explanatory drawing by the high frequency brazing apparatus shown.

  Reference numeral 1 shown in FIG. 1 is a high-frequency brazing apparatus according to an embodiment of the present invention. The high-frequency brazing device 1 is fitted with an aluminum material 6a and a fitting hole (not shown) provided in the aluminum material 6a at a right angle, and a ring-shaped brazing material 7 is fitted on the fitting side. A high-frequency heating coil 2 having a well-known configuration for heating a brazing region 6c of a brazing material 6 having a T-shape and made of an aluminum material 6b is provided. The high-frequency heating coil 2 is supplied with electric power from a high-frequency heating device 3 controlled by a control device 5 that receives a measured temperature (temperature signal) continuously transmitted from a radiation thermometer 4 that measures the temperature of the brazing region 6c. It is comprised so that.

The control device 5 has a plurality of calculation functions to be described later. That is, as shown in FIG. 2, the control device 5 has a preset unit time ΔXi (i) from the base point P of the calculation start temperature Fs set based on the specification (measurement temperature range) of the radiation thermometer 4. = 0 to n), the unit time ΔXi and the temperature difference Fi (i = 0 to n) between the measurement temperature (temperature sample) input from the radiation thermometer 4 and the calculation start temperature Fs are sequentially obtained. Multiplication is performed to calculate a multiplication value (ΔXi · Fi), and integral values Si (i = 0 to n) of all multiplication values (ΔXi · Fi) included in the heating time Xi from the base point P to the present time are calculated. A first calculation function for performing the first calculation work to be obtained is provided. The integrated value Si corresponds to the heating energy supplied to the brazing region 6c of the brazing material 6 from the base point P to the present time.

  The calculation procedure for obtaining the integral value Si by calculation can be changed to the following calculation means. Therefore, the calculation means for obtaining the integral value Si is not limited to the above calculation procedure. That is, every time a preset unit time ΔXi elapses from the base point P, the unit time ΔXi (for example, 0.1 second) is assumed to be 1, and the measured temperature (temperature) input from the radiation thermometer 4 A temperature difference Fi between the sample) and the calculation start temperature Fs is obtained. Next, the integral value of the temperature difference Fi from the base point P to the present time is calculated, and the integral value of the temperature difference Fi obtained by the calculation is multiplied by the unit time ΔXi (for example, 0.1 second). In addition, a value corresponding to the heating energy supplied to the brazing region 6c of the brazing material 6 having the same value as the integrated value Si can be obtained.

Further, a value that is twice the integral value Si is divided by the square value of the elapsed time Xi (= ΔXi × i) from the base point P to the present time, and a linear function (F = AXi) is provided with a second calculation function for performing a second calculation work for obtaining the gradient a. In this case, the integrated value Si corresponds to the area {(1/2) × Xi × Fi} of a right triangle having the base on the horizontal axis side as the time axis, as shown by hatching in FIG. The slope a of the linear function is obtained from the formula (2Si / Xi ² ).

A third calculation function is provided that performs a third calculation operation for obtaining a set temperature arrival expected time Xk that reaches the brazing set temperature Fn using a linear function (F = aXi) having the gradient a. Further, the heating time Xi from the base point P by the high frequency heating coil 2 is compared with the expected temperature arrival time Xk, and until the heating time Xi reaches the setting temperature arrival time Xk (Xi ≧ Xk), A fourth calculation work is performed in which the first calculation work to the third calculation work are sequentially repeated . Moreover, the comparison with the heating time Xi by the high-frequency heating coil 2 from the base point P to the length between the set temperature estimated arrival time Xk, after heating time Xi becomes set temperature estimated arrival time Xk, the high-frequency heating apparatus for thermal treatment after a predetermined time set in advance for 3, and a further subsequent power stop signal transmitting function of generating power power stop signal for stopping the supply of the high-frequency heating coil 2.

By the way, in the case of the high frequency brazing apparatus 1 according to the embodiment of the present invention, the radiation thermometer 4 has a specification capable of measuring a temperature range of 300 to 800 ° C. in order to minimize the influence of emissivity. Adopted. Therefore, when the measured temperature of the braze region 6c of the brazing material 6 is 300 ° C. or less, measurement instructions temperatures between with displays all 300 ° C. The measurement temperature, up to 320 ° C. from 300 ° C. Since the value is not always accurate, the calculation start temperature Fs at the base point P is set to 320 ° C.

Accordingly, the calculation start time of the base point P is the time from the start of heating of the brazing region 6c by the high frequency heating coil 2 until the measured temperature of the brazing region 6c by the radiation thermometer 4 reaches 320 ° C. It should be noted that the effect of emissivity can be reduced to some extent.
Therefore, the specification of the measurement temperature range does not necessarily have to be a radiation thermometer of 300 to 800 ° C., and is not limited to the specification of the measurement temperature range of the radiation thermometer.

  Hereinafter, the operation mode of the high-frequency brazing apparatus 1 according to the embodiment of the present invention having the above-described configuration will be described. That is, according to the high-frequency brazing device 1, the brazing position of the first aluminum material 6a of the brazing material 6 and the fitting position of the second aluminum material 6b into the fitting hole provided in the first aluminum material 6a. When the brazing part is brazed by melting the material 7 by heating with the high-frequency heating coil 2, first, supply of heating power from the high-frequency heating device 3 controlled by the control device 5 to the high-frequency heating coil 2 is started. The Simultaneously with the start of power supply, the measured temperature of the brazing region 6c of the brazing material 6 is sent from the radioactive thermometer 4 to the control device 5 as a temperature signal. Then, an elapsed time from the start of power supply and a measured temperature corresponding to the elapsed time sent from the radioactive thermometer 4 are displayed on a monitor screen (not shown) provided in the control device 5.

When the measurement temperature of the brazing region 6 c of the brazing material 6 measured by the radiation thermometer 4 reaches 320 ° C., which is the calculation start temperature Fs, by the continuation of heating by the high-frequency heating coil 2, the control device 3 The operation is started. That is, every time the unit time ΔXi elapses from the base point P of 320 ° C., this unit time ΔXi is multiplied by the temperature difference Fi between the measured temperature and the calculation start temperature to calculate a multiplication value (ΔXi · Fi). In addition, an integral value Si (Si = ΣΔXi · Fi) of each multiplication value (ΔXi · Fi) during the elapsed time Xi from the base point P to the present time is calculated. Then, by dividing the integral value Si by the elapsed time Xi, a gradient a of a linear function (F = aXi) starting from the base point P is calculated.

  A set temperature arrival expected time Xk that reaches the brazing set temperature Fn is calculated from a linear function (F = aXi) using the gradient a, and the above calculations are repeated sequentially. Then, when the heating time Xi from the base point P reaches the set temperature arrival expected time Xk, the control device 5 reads from the radiation thermometer 4 when the heating time Xi reaches the set temperature arrival expected time Xk. Regardless of the measured temperature, it is determined that the actual temperature at the brazing site of the brazing material 6 has reached the brazing set temperature Fn.

That is, the control device 5 recognizes that the heating energy necessary to reach the brazing set temperature Fn is supplied to the brazing portion of the brazing material 6, and based on this recognition, the control device 5 It is determined that the actual temperature of the brazing part has reached the brazing set temperature Fn.
The control device 5 that has determined that the heating time Xi has reached the set temperature arrival expected time Xk has a high frequency after a predetermined time (for example, about 2.5 seconds) preset for the high frequency heating device 3. A power stop command signal for stopping the supply of power to the heating coil 2 is issued.
When the supply of power from the high-frequency heating device 3 to the high-frequency heating coil 2 is stopped, the brazing of the brazed portion of the brazing material 6 is finished. The reason for post-heating the brazed part of the brazing material 6 is to produce a brazed product having excellent reliability with no defects in the brazed part by allowing the brazing part to rotate well. is there.

  The measured temperature of the brazing portion of the brazing material 6 measured by the radiation thermometer 4 varies greatly in the rising process, and the dimensional shape of the aluminum materials of the brazing material 6 Even if are the same, the rising state is different. Therefore, the heating time for the temperature measured by the radiation thermometer 4 to reach the brazing set temperature Fn varies greatly.

  However, according to the high-frequency brazing apparatus 1 according to the embodiment of the present invention, as described above, the heating energy necessary to reach the brazing set temperature Fn is supplied to the brazing portion of the brazing material 6. Based on the recognition, the control device 5 determines that the actual temperature of the brazing part has reached the brazing set temperature Fn, and the supply of power from the high-frequency heating device 3 to the high-frequency heating coil 2 is stopped. Therefore, it becomes possible to manufacture a brazed product made of an aluminum material having excellent reliability.

  In the high-frequency brazing device 1 according to the embodiment of the present invention, when the heating time Xi reaches the set temperature arrival expected time Xk, the temperature of the brazing region 6c of the brazing material 6 is brazed. It was determined that the temperature was reached. However, since a temperature sample of one measurement temperature is taken every unit time ΔXi, when the number of temperature samples from the base point P reaches the number of temperature samples obtained by calculation, the brazing material 6 is brazed. It can be determined that the temperature of the brazing region 6c has reached the brazing set temperature.

Hereinafter, with reference to FIG. 3 of the accompanying drawings, an embodiment of the present invention will be described in which the brazed portion of the brazing material 6 is brazed by the high-frequency brazing apparatus 1 according to the embodiment of the present invention.
FIG. 3 is a drawing of what is shown on the monitor screen. The vertical axis indicates the temperature measured by a radiation thermometer (unit: ° C.), and the horizontal axis indicates the heating time from the start of heating (unit: × 10). It is brazing work condition explanatory drawing which shows ^-1 s). FIG. 3 shows an increase state of the measured temperature of the brazed portion when three brazing materials are brazed, and a linear function starting from the base point P based on the increased state of each measured temperature. Has been. In this case, the measurement temperature rise state and the linear function of the three brazed parts are as follows. Incidentally, the unit time ΔXi of the temperature measured by the radiation thermometer in this embodiment is set to 0.1 seconds, but it does not have to be particularly 0.1 seconds, for example, less than 0.1 seconds. However, since it may be 0.2 seconds, it is not limited to the set seconds of the unit time ΔXi.

(1) Brazing material A
The rising state of the measured temperature is indicated by a black circle, and the linear function A _F is indicated by a solid line.
(2) Brazing material B
The rising state of the measured temperature is indicated by a black square, and the linear function _BF is indicated by a broken line.
(3) Brazing material C
The rising state of the measured temperature is indicated by a black triangle, and the linear function _CF is indicated by a one-dot chain line.

According to FIG. 3, in the case of the brazing material A, it reaches the brazing set temperature Fn obtained from the heating time Xa when the measured temperature measured by the radiation thermometer reaches the brazing set temperature Fn and the linear function _AF. Estimated set temperature arrival time Xk is substantially the same, but the cases of brazing materials B and C are different. That is, in the case of the brazing material B, the heating time Xb when the measured temperature measured by the radiation thermometer reaches the brazing set temperature Fn reaches the set temperature reaching the brazing set temperature Fn obtained from the linear function _BF. 0.2 seconds than expected time Xk short, in the case of the brazing material C, the heating time Xc measured temperature measured by the radiation thermometer reaches the brazing temperature setting Fn, is determined from the linear function C _F The estimated temperature arrival time Xk that reaches the brazing set temperature Fn is about 0.8 seconds shorter.

By the way, in the case of the brazing material A, as described above, the brazing set temperature Fn obtained from the heating time Xa in which the measured temperature measured by the radiation thermometer 4 reaches the brazing set temperature Fn and the linear function _AF. Is approximately the same as the set temperature arrival expected time Xk. However, it can be understood that this is a complete coincidence. The fact that this is a complete coincidence can be easily assumed since the rising state of the measured temperature measured by the radiation thermometer approximates a straight line.

The difference between the heating time Xa and the heating time Xc at which the measured temperatures measured by the radiation thermometers of the brazing materials A and C reach the brazing set temperature Fn is about 1.6 seconds. Thus, the difference in the estimated temperature arrival time Xk reaching the brazing set temperature Fn obtained from the linear functions A _F and C _F is about 0.7 seconds, and the variation in the heating time is large (reduced by about 0.9 seconds). It can be seen that there is an improvement.

  The improved time of about 0.9 seconds is very short, and it is considered that the brazing of the brazing material is not so badly affected. However, as is well understood from FIG. 3, in the case of these brazing materials A, B and C, the time required for brazing from the start of heating to the completion of brazing is about 13.5 seconds, which is 7%. It can be said that the heating time difference of about 0.9 seconds has a great influence on the quality of the brazed product.

  That is, according to the embodiment of the present invention, the shortage of the heating time of the brazed portion of the brazing material is improved and the variation in the heating time is reduced, which greatly improves the reliability of the aluminum brazed product. It turns out that the effect which can contribute is acquired. Incidentally, as a result of the visual inspection of the brazing materials A, B, and C, the brazing material 6c is insufficiently melted due to insufficient heating time, the penetration of the brazing region is insufficient, and the brazing region 6c due to excessive heating time. There are no problems in appearance such as surface melting of the first aluminum material and second aluminum material, sagging flow of the brazing material, and the brazing state of the brazed portions of the brazed materials A, B, and C is extremely good. Met.

  In the above embodiment, the case where the embodiment is applied to the brazing of the T-shaped brazing material 6 has been described as an example. However, the high frequency brazing apparatus of the present invention can be applied not only to a T-shaped brazing material but also to a brazing material that brazes aluminum materials in a straight line. it can. Therefore, the application to the brazing material having a T-shape is not particularly limited. In addition, according to the high-frequency brazing apparatus according to the embodiment of the present invention, it is possible to exert a great effect on brazing between aluminum materials whose measurement temperatures by a radiation thermometer are not stable, but metals other than aluminum materials Of course, it can also be applied to brazing of materials.

It is typical structure explanatory drawing of the high frequency brazing apparatus which concerns on embodiment of this invention. It is brazing control explanatory drawing by the high frequency brazing apparatus which takes the measurement temperature by a radiation thermometer on a vertical axis | shaft, and takes the heating time from the heating start time on a horizontal axis. It is brazing work condition explanatory drawing which takes the temperature measured by a radiation thermometer on the vertical axis, and shows the heating time from the start of heating on the horizontal axis. It is explanatory drawing of the raise state of the measurement temperature by the radiation thermometer of aluminum material. It is a block diagram which shows the brazing apparatus which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... High frequency brazing apparatus 2 ... High frequency heating coil 3 ... High frequency heating apparatus 4 ... Radiation thermometer 5 ... Control apparatus 6 ... Brazing material, 6a ... 1st aluminum material, 6b ... 2nd aluminum material, 6c ... Brazing Region 7: Brazing material a ... Linear function gradient Fi ... Temperature difference Fn ... Brazing set temperature Fs ... Calculation start temperature (320 ° C)
P ... Base point Si ... Integral value Xi ... Heating time Xk ... Estimated temperature reaching time ΔXi ... Unit time

Claims (2)

A high-frequency heating coil that heats a brazing region between aluminum materials by supplying electric power from a high-frequency heating device, a radiation thermometer that measures the temperature of the brazing region, and a measurement using the radiation thermometer In a high-frequency brazing device comprising a control device that controls the high-frequency heating device based on a measured temperature,
Wherein the control device, each time elapses unit time from the base point of the operation start temperature set based on the specification of the radiation thermometer, with determining the temperature difference between measured temperature and the operation starting temperature, from the base point to the current time A first calculation operation for obtaining an integral value that takes into account the unit time of each temperature difference during the elapsed time;
A second arithmetic operation for obtaining a gradient of a linear function taking the unit time starting from the base point by dividing a value twice the integral value by the square of the elapsed time;
A third calculation operation for obtaining an estimated time for reaching the set temperature to reach the brazing set temperature from the linear function using the gradient;
While performing the fourth calculation work to sequentially repeat the first calculation work to the third calculation work until the heating time from the base point reaches the set temperature arrival expected time obtained in the third calculation work,
After the heating time from the base point reaches the set temperature arrival expected time, post-heat treatment is performed for a predetermined time with respect to the high-frequency heating device, and then the power for stopping the supply of power to the high-frequency heating coil A high-frequency brazing apparatus comprising a power stop signal transmission function for generating a stop signal. In the high frequency brazing method of brazing the brazed part by heating with a high frequency heating coil while measuring the temperature of the brazed part between aluminum materials with a radiation thermometer,
Each time a unit time elapses from the base point of the calculation start temperature set based on the specifications of the radiation thermometer, the temperature difference between the measurement temperature by the radiation thermometer and the calculation start temperature is obtained, and from the base point to the present time A first step of obtaining an integral value taking into account the unit time of each temperature difference during the elapsed time;
A second step of determining a gradient of a linear function taking into account the unit time starting from the base point by dividing twice the integral value by the square of the elapsed time;
A third step of determining a set temperature arrival time to reach the brazing set temperature from a linear function using the gradient;
A fourth step of sequentially repeating the first to third steps until the actual heating time from the base point reaches the set temperature arrival expected time determined in the third step;
After the heating time from the base point reaches the set temperature arrival expected time, post-heat treatment is performed for a predetermined time with respect to the high-frequency heating device, and then the power for stopping the supply of power to the high-frequency heating coil A high-frequency brazing method comprising: a fifth step of issuing a stop signal.

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