JP3515962B2 - Brazing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to brazing methods and brazing apparatus, in particular, those with a brazing material to the wire-like is supplied to the brazed parts related with apparatus will rows as sell.

[0002]

2. Description of the Related Art FIG. 5 is a schematic diagram of a brazing device disclosed in Japanese Patent Laid-Open No. 6-297142.

Referring to the drawing, a work 7 which is a part to be brazed.
A current path 79 from the work 77 to the wire 74 via the power supply 80 is formed in the brazing device having the wire feeder 71 for supplying the wire 74 as the brazing material to the brazing portion 78 of the No. 7.

The wire feeder 71 detects that the wire 74 and the work 77 are separated from each other by the melting of the wire 74 due to the heating of the work 77, and that the power supply state is changed to the non-conduction state. Based on the detection signal from the feeder 71, the controller 82 instructs the start of the brazing operation.

As a result, unnecessary heating of the work can be reduced.

In the conventional brazing apparatus as described above, it is possible to detect the timing at which the work reaches the brazing temperature, but it is premised that both the work and the wire are made of a conductive material. That is, it cannot be applied to a brazing material made of a non-conductive material. Further, in this brazing device, since it is necessary to wire each work to form a current path, the work becomes complicated and an efficient production system cannot be obtained.

[0006] This invention has been made in order to solve the above problems, it can be applied with or without a conductive part mounted to be wax, and high color would biasing device versatility suitable for automated The purpose is to provide.

[0007]

[Means for Solving the Problems]

[0008]

[0009]

[0010]

In order to achieve the above object, the invention according to claim 1 is a brazing apparatus for supplying a wire to a part to be brazed to perform brazing, and the wire can be continuously fed out. Wire supply means, a nozzle for holding the tip of the wire so that it can be inserted therethrough and guiding it to the brazing location of the part to be brazed, and nozzle holding means for moving the nozzle back and forth toward the part to be brazed. A nozzle moving means for moving the nozzle rearward with respect to the brazed component in response to the wire feeding by the wire supplying means, a position detecting means for detecting the position of the nozzle , a nozzle holding means, and a nozzle.
Move the brazing filler metal supply part consisting of
Movable motive and supply of wire to brazed parts
The wire feed means is activated in response to the detection output of the timing detection means for detecting the feed timing and the position detection means indicating that the position of the nozzle is the most advanced with respect to the brazed component, and outputs other than the detection output. In this case, the wire supply means is controlled to be deactivated , and the timing is detected.
In response to the detection output of the means, the brazing material supply section is the brazed section.
And a control means for controlling the moving mechanism so as to approach the product .

According to this structure, the wire supplying means is controlled by the position of the nozzle and the brazed portion
For example, when the product reaches the brazing temperature
The nozzle approaches the part to be brazed .

According to a second aspect of the present invention, in the structure of the first aspect of the invention, the wire supply means comprises a feed roller rotating in contact with the wire, and a motor for driving the feed roller.

With this structure, the wire is fed by driving the motor.

According to a third aspect of the present invention, in the configuration of the second aspect of the invention, the nozzle moving means has flexibility, and the wire sent from the wire supplying means is inserted into the nozzle moving means. The tube is a tube that does not expand and contract in the axial direction, one end of the tube is connected to the rear end of the nozzle, and the other end of the tube is connected to the vicinity of the delivery side of the feed roller.

With this structure, the total length of the tube and the nozzle is constant.

According to a fourth aspect of the present invention, in the structure according to any one of the first to third aspects, a biasing means for biasing the nozzle to move toward the brazed component is further provided. Be prepared.

According to this structure, the nozzle is always urged to move toward the brazed component regardless of the levelness of the nozzle.

[0019]

[0020]

The invention according to claim 5 is from claim 1 to claim
In the configuration of the invention described in any one of the items 4 to 5, further comprises a detection means for detecting the feeding of the wire supply means, and an input means for inputting the usage amount of the wire with respect to the brazed component, and the control means is input. The brazing filler metal supply section moves away from the parts to be brazed in response to the output of the detection means indicating that the wire feed amount corresponding to the used amount has been detected and the detection output of the position detection means that follows. It controls the mechanism.

With this structure, a wire feed amount corresponding to the input wire usage amount is secured.

[0023]

[0024]

[0025] As described above, an invention according to claim 1, for the wire feeding means is controlled by the position of the nozzle is prevented oversupply of unnecessary wire, with a stable brazing can be performed , Nozzle and wire covered
Less likely to be affected during heating of brazing parts
Therefore, the reliability of the device is improved .

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, since the wire is fed out by driving the motor, stable feeding of the wire is controlled.

According to the invention described in claim 3 , in addition to the effect of the invention described in claim 2 , since the length of the tube and the nozzle is always constant, the position of the tip of the wire is fixed. When the wire is delivered by, the nozzle moves so as to retract with respect to the tip of the wire. Therefore, the change in the nozzle movement position can be determined as the wire feed amount.

[0028] The invention of claim 4, wherein, in addition to the effect of the invention according to any one of claims 1 to 3, the design of the device is facilitated since the installation levelness constraints nozzles is alleviated .

[0029]

The invention according to claim 5 is from claim 1 to claim
In addition to the effects of the invention according to any one of items 4 ,
That is, since the amount of brazing material used is desired, the quality of brazing is improved.

[0031]

1 is a block diagram showing a schematic configuration of a brazing apparatus according to a first embodiment of the present invention.

Referring to the drawing, the brazing apparatus 11 includes a controller 1
3 is mainly configured and is connected to the control unit 13.
A brazing material supply unit 15 for supplying the wire 18 to the brazed component 12, a wire delivery unit 31 for feeding the wire 18 to the brazing component supply unit 15, and a brazed component 12
Burner 39 for heating the brazing part of
And a temperature sensor 41 for measuring the temperature of the portion heated by the burner 39, and an input unit 43 for setting the supply amount of the wire 18 from the brazing material supply unit 15 to the brazed component 12. Has been done.

Specifically, the brazing material supply portion 15 has a tubular shape, and holds the wire 18 in the axial direction so that the wire 18 can be inserted therethrough and guides the wire 18 to the brazing portion of the brazed component 12. The nozzle 17 is mainly configured. Nozzle 1
Reference numeral 7 is held by a pair of slide bearings 19a and 19b so as to be movable in its axial direction.

The slide bearings 19a and 19b are fixed to the frame 21.
Is configured to be movable by the air cylinder 22 in the same direction as the axial direction of the nozzle 17. That is, the air cylinder 22 that serves as a moving mechanism of the brazing material supply unit 15 is
Based on a control signal from the controller 13, the position of the frame 21, that is, the nozzle 17 is moved so as to move closer to or farther from the brazed component 12.

A disk-shaped biasing member 24 is fixed to the body of the nozzle 17, and a coil spring 25 serving as a biasing means is mounted between the biasing member 24 and the slide bearing 19b. ing. That is, the coil spring 2
The nozzle 17 to which the biasing member 24 is fixed by 5 is
It is constantly urged in the axial direction toward the brazed component 12.

In this embodiment, since the nozzle 17 is attached to the part to be brazed 12 in an inclined state with its tip facing downward, the nozzle 17 is always attached.
Is gravitationally urged toward the brazed component 12. However, depending on the brazing device, the nozzle 1
There is a case where it is unavoidable to install 7 in a horizontal direction or in a posture in which the tip thereof is upward. Even in such a case, since the coil spring 25 is attached, the urging state of the nozzle 17 toward the tip direction can be maintained. Therefore, by installing this coil spring 25, the nozzle 17
The restrictions on the installation horizontality are eased, and the brazing apparatus can be easily designed.

A disc-shaped object to be detected 23, the position of which is detected by a position sensor 27, is fixed to the portion of the nozzle 17 behind the slide bearing 19b.
Since the detected body 23 is formed larger than the opening of the slide bearing 19b for the nozzle 17, if the detected body 23 comes into contact with the slide bearing 19b even if the coil spring 25 is biased, the nozzle 17 of the nozzle 17 is covered. The movement toward the brazed component 12 is stopped. The position sensor 27 detects the position of the detected body 23 fixed to the rear portion of the nozzle 17, and transmits the detection result to the control unit 13.

The wire delivery section 31 is connected to the pair of feed rollers 34a, 34b and 34b which rotate in contact with the wire 18 drawn from the wire reel 36 from both sides thereof, and the control signal of the control section 13 is supplied. A motor 33 whose drive is controlled based on
An encoder 3 which is connected to b and counts the feed amount of the wire 18 based on the rotation of the feed roller 34b.
It is composed of 5 and.

The feed amount of the wire 18 counted by the encoder 35 is constantly transmitted to the control unit 13. The wire 18 sent from the wire sending unit 31
The wire 18 is inserted through the rear end of the nozzle 17 of the brazing material supply unit 15, and the wire 18 between them is inserted through the tube 29.

The tube 29 is made of a material which is flexible and does not expand or contract in its axial direction. One end of the tube 29 is connected to the rear end of the nozzle 17 and the other end thereof is connected to the motor 33 of the wire feeding section 31. It is connected to the fixed foot piece 37. Since the tube 29 is configured in this manner, the wire 18 delivered from the wire delivery section 31 is deformed together with the tube 29. In this embodiment, the other end of the tube 29 is attached to the fixing piece 37 fixed to the motor 33, but the attachment position is not limited to this, and the position from the feed roller 34a and the feed roller 34b is always set. It may be fixed at a fixed position.

When the brazing operation is started under the control of the control unit 13, the burner 39 approaches the brazed component 12 in order to raise the brazing location of the brazed component 12 to a predetermined temperature. To heat. The temperature sensor 41 is a burner 39
The temperature of the part of the brazed component 12 heated by is detected, and the detection result is transmitted to the control unit 13. As a result, when the detected temperature reaches a temperature suitable for brazing, the control unit 13 gives an instruction to the brazing material supply unit 15, the wire feeding unit 31, and the burner 39 at the timing. The input section 43 is used to preset the amount of the wire 18 to be supplied according to the size, structure, etc. of the brazed component 12. This prevents excessive supply of the wire 18 as will be described later and improves brazing quality.

In FIG. 1, the brazing material supply section 15 is controlled so as to be located at a position distant from the brazed component 12. It shows a state in which the temperature is not suitable for brazing. In this case, the brazing material supply unit 15 is moved away from the brazed component 12 so that the burner 3
The influence of heating by 9 on the wire 18 protruding from the tip of the nozzle 17 is reduced.

FIG. 2 shows the brazing apparatus shown in FIG.
It is the schematic which showed the position of the brazing material supply part 15 when the temperature of the brazing location of the part to be brazed 12 became the temperature suitable for brazing.

Referring to the drawing, when the temperature sensor 41 detects that the brazing location of the brazed component 12 has reached a predetermined temperature due to the heating of the burner 39 as the supply timing of the wire 18, the control unit 13 Upon receiving this detection signal, an instruction is sent to the air cylinder 22. As a result, the air cylinder 22 operates and the frame 21 moves in the direction indicated by the arrow. The slide bearings 19a and 19b are fixed to the frame 21, and
Since the biasing member 24 fixed to the nozzle 17 is biased by the coil spring 25 in the direction toward the brazed component 12, the nozzle 17 should move to the position closest to the brazed component 12. become. The tip position of the nozzle 17 is preset so that the length of the wire 18 protruding from the tip of the nozzle 17 to the brazed component 12 at this position becomes an ideal length for brazing.

When the nozzle 17 moves to this extreme position, the object to be detected 23 fixed to the rear portion of the nozzle 17
Also moves forward, and the position sensor 27 detects this position. When the detection signal of the position sensor 27 for the detected object 23 is input to the control unit 13, the control unit 13
Responds to this by driving the motor 33. As a result, the feed roller 34a connected to the motor 33 rotates, and the wire 18 wound around the wire reel 36 is fed out. At this time, the wire 18 is
The feed roller 34b located on the opposite side via the roller also rotates in association with this feeding. This rotation speed is determined by the encoder 35
Counts and transmits the count result to the control unit 13.

The wire 18 delivered by the feed roller 34a goes into the tube 29, but is fixed as compared with before the delivery when the tip of the wire 18, that is, the portion in contact with the brazed component 12 is not melted. The position of the piece 37 and the length to the tip of the wire 18 are increased by the amount sent by the drive of the motor 33. On the other hand, the tube 29 is made of a material that has flexibility but does not expand and contract in its axial direction. The axial length of the nozzle 17 made of a metal material is also constant.
That is, the total length of the nozzle 17 and the tube 29 is always constant.

Therefore, the nozzle 17 moves in the direction indicated by the arrow so as to retract with respect to the tip of the wire 18 by the length of the wire 18 delivered. The nozzle 17 has slide bearings 19a and 19b.
Since the nozzle 17 is held so as to be movable in the axial direction thereof, the nozzle 17 smoothly moves rearward against the forward biasing force of the coil spring 25.

FIG. 3 is a schematic view showing a state in which the nozzle 17 has moved rearward from the state of FIG.

Referring to the figure, when the nozzle 17 moves rearward with respect to the brazed component 12 by feeding the wire 18, the detected body 23 also moves rearward accordingly.
Therefore, the detected body 23 is not detected by the position sensor 27, and this signal is transmitted to the control unit 13.
The control unit 13 stops the drive of the motor 33 in response to this signal. This prevents further delivery of the wire 18.

In this state, the wire 18 protruding from the tip of the nozzle 17 melts. When the tip of the wire 18 melts, the nozzle 17 itself is constantly urged by the coil spring 25 in the forward direction.
The wire 7 is advanced by the amount that the wire 18 is melted.

The tip of the wire 18 melts and the nozzle 1
When the protruding length of the wire 18 from the tip of the wire 7 becomes the same as the length shown in FIG. 2, the position of the brazing material supply unit 15 changes to the state shown in FIG. Then, the position sensor 27 detects the detected body 23, and in response to this detection signal, the control unit 13 drives the motor 33 again and sends the wire 18 again from the wire reel 36. O of this motor 33
By repeating N and OFF, the brazing proceeds in a preferable state in which the protruding length of the wire 18 from the nozzle 17 is substantially constant.

Here, the drive capability of the motor is set so that the amount of the wire 18 delivered by the rotation thereof is equal to or more than the amount of melting of the tip of the wire 18 by brazing. This is because if the amount of wire delivered is less than the amount melted, the wire 18 will intermittently contact the brazed component 12 without always contacting it, and good brazing cannot be obtained. Considering that the melting amount of the wire as the brazing filler metal is not constant depending on the material and size of the brazed component 12, the rotational speed of the motor 33 is configured to be variable, and the rotational speed of the brazed component is adjusted. If it can be set from the input unit 43 according to 12, the usability will be further improved.

When the feed amount of the wire 18 counted by the encoder 35 corresponds to the use amount of the wire 18 set by the input unit 43,
First, the controller 13 stops driving the motor 33. Then, in response to the detection signal of the detected object 23 from the position sensor 27, the control unit 13 determines that the brazing work is completed in the states of FIGS.

Therefore, the control section 13 sends a signal to the air cylinder 22 to move the brazing filler metal supply section 15 from the state shown in FIG. 2 to the state shown in FIG. Thereafter, under the control of the control unit 13, post-heat treatment or the like of the brazed component 12 by the burner 39 is performed, and the brazing work is completed. When the brazing work of the part to be brazed 12 is completed in this manner, the similar brazing work is performed on the next new brazing part.

The controller 13 does not complete the brazing work only by confirming the feed amount counted by the encoder 35, but completes the brazing work with the subsequent detection signal of the position sensor 27 for the object 23 to be detected. The reason is as follows. That is, even if the amount of the wire 18 sent out lastly is counted by the encoder 35, if the state shown in FIG. 3 is satisfied, the amount of the wire sent out is not consumed as the actual brazing. This is because the amount of the wire 18 delivered counted by the encoder 35 is used for brazing the brazed component 12 only after the subsequent state of FIG.

FIG. 4 is a flow chart showing the specific control contents of the control section of the brazing device shown in FIGS.

Referring to the figure, when the start of the brazing work is instructed, the burner 39 heats the brazed component 12 in step S51. Then, when it is detected by the temperature sensor 41 that the brazing portion of the brazed component 12 has reached a predetermined temperature due to this heating (S52),
In step S53, the nozzle 17 is brazed to the component 12 to be brazed.
The air cylinder 22 is controlled to move forward with respect to.

When the position sensor 27 detects the detected body 23 and the detection signal is turned on, the motor 33 is driven (S56). The feed amount of the wire 18 driven by the motor 33 is counted by the encoder 35,
It is determined whether or not the counted feed amount reaches the predetermined feed amount input by the input unit 43 (S5).
7). If the feed amount is not completed, step S5
4, the process returns to the determination of the detection result of the position sensor 27.

On the other hand, the object 23 to be detected by the position sensor 27
If the detection signal of is not ON, the motor 33
Is controlled to stop (S55). Then, the process returns to the determination step of the detection result of the position sensor 27.

When it is determined in step S57 that the feed amount of the wire 18 has reached the predetermined feed amount, the motor 33 stops (S58). When the position sensor 27 detects the detected body 23 and the detection signal is turned on (YES in S59), the control unit 13 drives the air cylinder 22 to retract the nozzle 17 from the brazed component 12 (S60). ). Then, the post-heating of the brazed component 12 after brazing by the burner 39 is performed (S61), and the brazing operation is completed.

In the above embodiment, the motor 33 is an ordinary motor and the feed amount of the wire 18 is detected by the encoder 35 connected to the feed roller 34b. Instead of this, the motor 33 is used. If a pulse motor is used, an encoder is not required, and it is possible to efficiently control the feeding of the wire 18 and detect the feeding amount.

In the above embodiment, the supply of the wire 18 is started when the brazed component 12 reaches a predetermined temperature due to the heating by the burner 39. At this time, the control unit 13 controls the heating power of the burner 18. The temperature of the brazed component 12 may be kept constant.

Further, in the above embodiment, the tube 2
Nozzle 17 depending on the delivery of wire 18 using
Has achieved the retreat of, but other mechanism, namely,
A mechanism for retracting the nozzle 17 by an amount corresponding to the amount of the wire 18 delivered may be separately used.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a brazing device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of the brazing device shown in FIG. 1, showing a state in which a brazing material supply unit has advanced.

FIG. 3 is a diagram showing a state in which a wire is fed in the block diagram of the brazing device shown in FIG.

4 is a flow chart showing specific control contents of a control unit of the brazing device shown in FIG.

FIG. 5 is a block diagram showing a schematic configuration of a conventional brazing device.

[Explanation of symbols]

11 ... Brazing device 12 ... Brazed parts 13 ... Control unit 15 ... Brazing material supply section 17 ... Nozzle 18 ... Wire 22 ... Air cylinder 23 ... Object to be detected 24 ... Energized member 25 ... Coil spring 27 ... Position sensor 29 ... tube 33 ... Motor 39 ... Burner 41 ... Temperature sensor 43 ... Input section In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (5)

(57) [Claims] 1. A brazing device for supplying a wire to a part to be brazed to perform brazing, the wire supplying means capable of continuously feeding the wire, and a tip portion of the wire held so as to be insertable. And a nozzle for guiding the brazed part of the part to be brazed, a nozzle holding means for moving the nozzle back and forth toward the brazed part, and a wire feeding means for feeding the wire. hand,
Nozzle moving means for moving the nozzle backward with respect to the part to be brazed, position detecting means for detecting the position of the nozzle, and brazing filler metal supply including the nozzle holding means and the nozzle.
Movement that can move the part back and forth with respect to the part to be brazed
Machine and the timing of wire supply to the brazed parts.
Other than the detection output, the wire supply means is activated in response to the output timing detection means and the detection output of the position detection means indicating that the position of the nozzle is the most advanced with respect to the brazed component. In the output of, the wire supply means is controlled to be inactivated, and the detection output of the timing detection means
In response to the brazing material supply section
And a control means for controlling the moving mechanism according to the above . Wherein said wire feed means includes a feed roller that rotates in contact with the wire, and a motor for driving the feed roller, brazing apparatus according to claim 1. 3. The nozzle moving means has the wire sent from the wire supplying means inserted therein.
A tube having flexibility and not expanding and contracting in the axial direction thereof, one end of the tube is connected to a rear end portion of the nozzle,
The brazing device according to claim 2 , wherein the other end of the tube is connected to the vicinity of the feed side of the feed roller. Wherein said nozzle further comprising biasing means for biasing said to move toward a brazed components, brazing device according to any one of claims 1 to 3. 5. A detection means for detecting a feed amount of the wire supply means, and an input means for inputting a usage amount of the wire with respect to the brazed component, wherein the control means has the input usage amount. An output of the detection means indicating that the wire feed amount corresponding to is detected,
In response to the detection output indicating that the position of the nozzle of the position detecting means is the most advanced, the brazing material supply unit is controlled to move away from the brazed component, and the moving mechanism is controlled. The brazing device according to any one of claims 1 to 4 .