JPH0829406B2 - Automatic brazing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automatic brazing device, and more particularly to an automatic brazing device that continuously heats a joint portion by a heating means.

[Prior Art] Conventionally, an automatic brazing device for heating a joint portion by a burner of this kind has a heating means by a burner and a brazing supply means, and when a brazing flux is not added, Further, it was equipped with a flux supply means.

Then, the burner of the heating means heats the joint portion of the article to be welded, and the brazing material is flown from there to braze the joint portion of the article to be welded.

Alternatively, the joint portion of the article to be joined is brazed by heating the joint portion of the article to be joined by the burner and supplying the flux from the flux supply means and flowing the braze from the brazing supply means.

[Problems to be Solved by the Invention] A conventional automatic brazing device of this type has a change in mass of an object to be welded, a change in outside air temperature, a case where the brazing device is temporarily stopped and the burner temperature changes, etc. In this case, the operator adjusted the heating power of the burner of the heating means or the heating time. Therefore, the control depends on the empirical rule of the operator, a human error is large, and the quality is not stable. In addition, there is a problem that it takes time to stabilize the quality.

On the other hand, as prior arts for performing heating control close to those of an automatic brazing device, there are techniques disclosed in Japanese Patent Laid-Open Nos. 56-146831, 54-147886, and Japanese Utility Model Laid-Open No. 61-41461.

Japanese Unexamined Patent Publication No. 56-146831 is for performing annealing or brazing of a cold forged product, and is provided with a heat treatment furnace having a heater and a belt for carrying an object to be welded inside the heat treatment furnace. The present invention relates to temperature control of a continuous heat treatment device.
However, although a temperature control technique for performing uniform heat treatment of the objects to be joined with high accuracy is disclosed, there is no consideration of, for example, changes in the mass (heat capacity) of the joining parts of the objects to be joined, heat transfer conditions, and the like.

Further, Japanese Patent Application Laid-Open No. 54-147886 discloses a technique for controlling the temperature of an object to be bonded with high accuracy, and the thermal conductivity, specific heat, density and surface condition of the object to be bonded are soldered. It also discloses that it is a factor that determines the amount of heat transferred to the joint to be attached. However, the thermal conductivity of the objects to be joined,
There is no disclosure of how or how the specific heat, density and surface condition determine the amount of heat transferred to the joint to be soldered, and how it should be addressed.

Then, Japanese Utility Model Laid-Open No. 61-41461 discloses a temperature control technique for soldering according to the temperature of the objects to be joined. However, there is nothing to consider, for example, changes in the mass (heat capacity) of the joints of the objects to be joined, heat transfer conditions, and the like.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide an automatic brazing apparatus capable of responding to changes in brazing conditions at the joints of objects to be joined and performing good brazing. It is what

[Means for Solving Problems] An automatic brazing device according to the present invention includes a transfer means for transferring an object to be welded, a gas burner for heating a welding point of the object to be welded, and a heated welding point. A brazing material supplying means for supplying a brazing material, an input means for inputting a heat transfer condition at a joint portion of the object to be welded, an outside air temperature, a elapsed time of use of a gas burner, and a type of brazing material, and an object to be welded inputted by the input means. According to the transfer speed of the transfer means, the amount of heat received by the joint of the objects to be welded is controlled according to the heat transfer conditions of the joint, the outside air temperature, the elapsed time of use of the gas burner, and the type of wax.

[Operation] In the present invention, the object to be bonded is transferred by the transfer means, and the bonded portion of the transferred object to be bonded is heated by the gas burner. At this time, if the object to be bonded is constant, the temperature rise of the object to be bonded is determined by the transfer speed and the heat quantity of the gas burner. Therefore, if the control means further changes the amount of heat received by the joint of the object to be welded depending on the heat transfer conditions depending on the properties of the joint of the object to be welded, the outside air temperature, the elapsed time of use of the gas burner, and the type of wax. , Brazing that always matches the type of wax can be made.

[Embodiment] FIG. 1 is a block diagram showing the entire automatic brazing apparatus according to an embodiment of the present invention.

In the figure, a control circuit CPU is composed of a microcomputer and an interface circuit of a well-known driver circuit (not shown), etc., and constitutes the control means of this embodiment. The temperature sensor 1 detects the temperature of the outside air or the article to be joined 12. The numeric keypad 2 is a switch for inputting the conditions of the joint 12a of the article 12 depending on the material of the joint 12a of the article 12 and heat transfer conditions such as thermal conductivity and the type of brazing wire 8c used.

The pressure regulator 3 is connected to a gas cylinder 4 filled with LPG as a fuel, and the LPG set at a predetermined pressure therein is guided to valves V1, V2, V3. The LPG gas guided to the valves V1, V2, V3 is heated by means of a pilot ignition flow rate control valve C1 or a combustion flow rate control valve C2, C3 in which the supply flow rate of the LPG is set to 1 to 2. It is supplied to the burner which constitutes No. 7. Therefore, the heating means 7 changes the flow rate in three steps by using the combustion flow rate adjusting valves C2 and C3.

Similarly, the pressure regulator 5 is connected to a gas cylinder 6 filled with oxygen necessary for combustion of LPG as a fuel, and the oxygen set to a predetermined pressure therein is guided to valves V4, V5, V6. Oxygen introduced to the valves V4, V5, V6 is a flow rate control valve for pilot ignition C4 corresponding to LPG necessary for pilot burner ignition or a flow rate control for combustion corresponding to a ratio of 1: 2 of the supply flow rate of the LPG. It is supplied to the main burner 7a and the pilot burner 7b which constitute the heating means 7 via the valves C5 and C6.

The brazing supply means 8 is composed of a stepping motor 8a, a transfer roller 8b, and the like, and is configured to be able to supply the brazing wire 8c required for brazing in a required amount.

The transfer means 9 is a turntable 9a, a speed reducer 9b, a motor 9d and a brake 9c (or a clutch if necessary).
The rotation of the motor 9d is decelerated by the speed reducer 9b to rotate the turntable 9a. The rotation of the turntable 9a is braked by the output of the position sensor 11.
9c operates and the turntable 9a stops at a predetermined position. The object to be welded 12 is placed at a predetermined position on the turntable 9a, and the object to be welded 12 is placed at a predetermined position on the turntable 9a.
It is detected by the object-to-be-joined confirmation sensor 10 that the object is placed. The position sensor 11 and the object-to-be-joined confirmation sensor 10 are known optical or magnetic sensors or microswitches.

The automatic brazing device of the embodiment of the present invention thus configured can operate as follows.

2 to 3 are general flowcharts of the automatic brazing apparatus according to the embodiment of the present invention.

First, the main switch (not shown) that constitutes the automatic brazing apparatus of this embodiment is turned on, and the processing of this program is started. In step S1, the memory and output port used in this system are initialized. Then, the pilot burner 7b is ignited here. Object to be bonded 12 in step S2
The type and thickness of the material and the type of the brazing wire 8c are input with the ten-key 2, and temperature data is input from the temperature sensor 1 in step S3. In step S4, the data inputted in advance is addressed based on the type and thickness of the material to be welded 12, the type of braze, and the temperature data, and the heating power for heating time and the heating time T are searched. . The presence of the article to be joined 12 to be brazed in step S5 is detected by the article present confirmation sensor. When the presence of the article to be joined 12 is not detected by the article to be joined confirmation sensor 10, the brake 9c is turned off in step S23, the motor 9d is rotated in step S24, and the output of the position sensor 11 is checked during this step, and step S25 is performed.
The arrival of a predetermined position of the turntable 9a on which the object is placed is detected. Therefore, in step S25, the object to be bonded 1
When the arrival of the predetermined position of the turntable 9a on which 2 is placed is detected, the rotation of the motor 9d is stopped in step S26, and the brake 9c is turned on in step S27. At this time,
The stop position of the turntable 9a does not deviate from the target position because the speed reducer 9b is interposed. Then, again, the presence of the article 12 to be brazed in step S5 is detected by the article presence confirmation sensor 10. Therefore, the turntable 9a rotates until the presence of the article to be joined 12 is detected by the article present confirmation sensor 10. When the presence of the object 12 to be brazed is detected in step S5, step S6
With the timer built in the microcomputer of the control circuit CPU, the main burner 7a determines whether it is less than 1 minute after extinguishing the fire. Without entering, the process of step S14 starts.

When the timer built in the microcomputer of the control circuit CPU does not determine in less than 1 minute after extinguishing the main burner 7a in step S6, in step S7 1 after extinguishing the main burner 7a
It is judged whether it is within 2 minutes, and at this time, compared with the case where it is less than 1 minute after extinguishing the main burner 7a in step S8, the object to be welded
Heat the heating time T of the 12 joints 12a for 0.5 seconds longer,
The temperature drop of the main burner 7a is corrected by the heating time. Similarly, in step S9, 2-3 after the main burner 7a is extinguished.
It is judged whether it is within a minute, and at this time, compared with the case where it is less than 1 minute after the main burner 7a is extinguished in step S10, the article to be welded 12
The heating time T of the joining portion 12a is heated for 1.5 seconds longer, and the temperature drop of the main burner 7a is corrected by the heating time. Then, in step S11, it is determined whether or not it is within 3 to 4 minutes after extinguishing the main burner 7a. At this time, in step S12, the main burner 7a
a Compared with the case of less than 1 minute after extinguishing the fire, the heating time T of the joining portion 12a of the article to be joined 12 is heated for 2.5 seconds longer, and the temperature drop of the main burner 7a is corrected by the heating time. Further, when the time exceeds 4 minutes after extinguishing the main burner 7a, the heating time T of the joining portion 12a of the article to be welded 12 is increased by 3.5 seconds as compared with the case where the time is less than 1 minute after extinguishing the main burner 7a in step S13. It is heated and the temperature drop of the main burner 7a is corrected by the heating time.

When the heating time correction based on the temperature of the main burner 7a is completed, the process of the temperature correction routine based on the temperature of the joining portion 12a of the article 12 is started. When the temperature of the outside air goes out of the fluctuation within the predetermined temperature range from the start of brazing and rises or falls, the object to be joined 12 also rises or falls in temperature, so to compensate for it. In step S1
In step 4, the output of the temperature sensor 1 is checked to determine whether the temperature has risen above a predetermined temperature. When the temperature rise is equal to or higher than the predetermined temperature, in step S15, the heating time T of the joining portion 12a of the article to be joined 12 is shortened by 1 second,
Subtract 1 second from the heating time T. In step S16, the output of the temperature sensor 1 is checked to determine whether the temperature drop has dropped below a predetermined temperature. When the temperature drop is below the predetermined temperature, 1 second is added to the heating time T in order to heat the heating time T of the bonding portion 12a of the object to be bonded 12 for 1 second in step S17.

When the correction of the temperature of the main burner 7a and the outside air temperature of the heating time T of the joint 12a of the article 12 is completed, the heating time T of the joint 12a of the article 12 is obtained in step S18 in step S4. The main burner 7a is ignited by the thermal power, and the joint 12a of the article 12 is heated for the corrected heating time T. The elapse of this heating time T is determined in step S19. When the elapse of the heating time T is determined in step S19, a routine for supplying a predetermined amount of the brazing wire 8c to the joining portion 12a of the article 12 is entered in step S20. This routine rotates the stepping motor 8a N1 steps, contacts the brazing wire 8c at the joining position of the objects to be welded, melts it, and then stepwise rotates the stepping motor 8a N2 in the opposite direction,
Pull back the brazing wire 8c. That is, the supply length of the brazing wire 8c by the rotation of the stepping motor 8a is set to an amount corresponding to N1-N2. By supplying this predetermined amount of the brazing wire 8c to the joint 12a of the object 12 to be welded, the brazing wire 8c melted at the joint 12a of the object 12 immediately spreads uniformly.
That is, it gets wet.

When the process of supplying a predetermined amount of the brazing wire 8c to the joining portion 12a of the article to be joined 12 is performed in step S20, the main burner 7a is extinguished in step S21, and the time of 10 seconds is awaited in step S22, that is, during this time. In addition, the brazing wire 8c that wets the joint 12a of the article 12 is cured,
12a is brazed.

When brazing is completed, the brake 9c is turned off in step S23, and the motor 9d is rotated in step S24.
Observe the output of the position sensor 11, and in step S25
The arrival of a predetermined position of the turntable 9a on which is placed is detected. Therefore, when the arrival of the predetermined position of the turntable 9a on which the article 12 is placed is detected in step S25, the rotation of the motor 9d is stopped in step S26, and the brake 9c is turned on in step S27. Then, again, the presence of the article 12 to be brazed in step S5 is detected by the article presence confirmation sensor 10. Therefore, the turntable 9a rotates until the presence of the object to be welded 12 is detected by the object to be welded confirmation sensor 10, and the routine processing from step S5 to step S22 is repeated to perform brazing.

As described above, the automatic brazing apparatus according to the present embodiment includes the turntable 9a for transferring the objects to be joined, the speed reducer 9b, and the brake 9.
c, a transfer means 9 composed of a motor 9d, a heating means 7 composed of a single main burner 7a for heating the joining portion 12a of the article 12 to be joined, the type and thickness of the material to be joined 12 in step S2, The type of brazing wire 8c is input, and temperature data is input from the temperature sensor 1 in step S3. That is, by the type and thickness of material, the type of braze, and the temperature data,
Inputting means for addressing the inputted data and inputting conditions so that the heating power of the heating time and the heating time T can be searched for, and a stepping motor 8a for supplying the brazing wire 8c to the heated joint 12a, A joint portion of the brazing material 8 including the transfer roller 8b and the article 12 to be joined.
The heat transfer condition of 12a, the temperature, the elapsed time of use of the heating means, the type of the brazing wire 8c, which comprises a control means such as a control circuit CPU for controlling the amount of heat received by the joining portion 12a of the article 12 to be joined. If the article to be joined 12 is not transferred during the joining process of the article to be joined 12, the main burner 7a is cooled, and the joining point 12 of the article to be joined 12 is
Although it takes time for the temperature rise of a, by correcting it, the temperature of the joint portion 12a of the object to be welded 12 is always constant, and further, the joint portion 12a of the object to be joined 12a
The temperature of changes according to the outside air temperature on which the article to be joined 12 is placed, but since it is detected by the temperature sensor 1 and the heating time of the joining portion 12a of the article to be joined 12 is corrected, The quality of the brazed product can be constant.

It should be noted that in the above embodiment, the rotating transfer means 9 including the turntable 9a, the speed reducer 9b, the brake 9c, and the motor 9d is used as the transfer means for transferring the objects to be joined. However, the present invention is not limited to the rotary table such as the turntable 9a, but can be used for linear conveyors such as a belt conveyor. In particular,
The transfer means for transferring the object to be bonded is selected by the object to be bonded 12
The control means for controlling the amount of heat received by the joint portion 12a of
Either the transfer speed of the transfer means or the joining point 12
It also affects the choice of whether to control the heating time of a.

Further, in the above-mentioned embodiment, the single main burner 7a was used as the heating means for heating the joint portion of the object to be welded, but in consideration of the actual temperature distribution, the main portion of the joint portion 12a of the object to be welded 12 is heated. It is desirable to use a plurality of burners 7a. In particular, the plurality of main burners 7a are preferably arranged around the joint 12a of the article 12 to be joined.

The single main burner 7a used in the above embodiment
Is fueled by LPG, but can also be powered by electricity or liquid fuel.

Further, in the above embodiment, the brazing wire is applied to the heated joint.
Stepping motor as a brazing supply means for supplying 8c
Although the brazing supply unit 8 including the transfer roller 8b and the transfer roller 8b has been configured, the present invention is not limited to the above configuration, and molten braze can be supplied. It is also possible to supply the brazing wire 8c cut into a predetermined length.

The brazing wire 8c may be added with a flux that promotes wetting, or may be added with a flux in another step.

In addition, the control means of the above-mentioned embodiment, the heat transfer conditions, temperature, the elapsed time of use of the heating means, the brazing wire
Although the amount of heat received by the joining portion of the article to be joined is controlled by the type of 8c, in the case of carrying out the present invention, when the brazing type is constant, it is possible to delete and set the item. it can.

[Advantages of the Invention] As described above, the automatic brazing apparatus of the present invention includes the brazing supply means for supplying the brazing material to the heated joint, and the heat transfer condition of the joint of the objects to be welded inputted by the input means. , The temperature, the elapsed time of use of the gas burner, and the amount of heat received by the joints of the objects to be welded depending on the type of braze are controlled according to the transfer speed at which the objects to be welded are transferred. It is also possible to stabilize the quality because it does not require control that depends on the empirical rule of the operator and human error does not occur. Also, the adjustment time required for quality stabilization is unnecessary,
It can always respond to changes in brazing conditions and can achieve good brazing.

[Brief description of drawings]

FIG. 1 is a block diagram showing the entire automatic brazing apparatus according to an embodiment of the present invention, and FIGS. 2 to 3 are general flowcharts of the automatic brazing apparatus according to the embodiment of the present invention. In the figure, 7 is a heating means, 8 is a brazing supply means, 9 is a transfer means, 12 is an object to be welded, 12a is a joint, and CPU is a control circuit. In the drawings, the same reference numerals and symbols indicate the same or corresponding constituent parts.

Claims (1)

[Claims] 1. A transfer means for transferring an article to be welded, a gas burner for heating a joint of the article to be welded, a brazing supply means for supplying a braze to the heated joint, and a joining of the article to be joined. Input means for inputting heat transfer conditions at locations, outside air temperature, elapsed time of use of gas burner, type of brazing material, heat transfer conditions of joints of objects to be welded input at said input means, outside air temperature, use progress of gas burner An automatic brazing device, comprising: a control unit that controls the amount of heat received by the joint of the objects to be welded according to the transfer speed of the transfer unit depending on the time and the type of braze.