JPH0675773B2 - Flax wave height control method and apparatus - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a flux wave height control method for soldering and a device therefor.

[Conventional technology]

Conventionally, in a foaming type fluxer that applies the foaming flux flowing out of the nozzle to the soldering object, sometimes the visual contact of the foaming flux to the printed wiring board or the application state is monitored by visual inspection while using this fluxer. On the contrary, it is monitored whether the wave height of the foam wave front is appropriate.

Then, if there is an abnormality in the wave height, while visually checking the contact state and the coating state, the vertical movement of the flux main body is adjusted manually, or the flow rate of the foaming air is adjusted by a manual valve operation, whereby the foaming is performed. The wave height of the flux is adjusted manually.

[Problems to be solved by the invention]

However, such a manual adjustment of the wave height while visually observing requires first an operator to make the adjustment, and it is necessary for this operator to regularly monitor and adjust if necessary. Since the adjustment is performed by the operator's intuition, there is a lack of objectivity, and there is a risk of lack of reliability in always performing proper flux application.

An object of the present invention is to provide a flux wave height control method and apparatus for controlling the wave front of flux to an appropriate wave height unattended, and to enhance the reliability of flux application.

[Means for solving problems]

In the flux wave height control method of the present invention, the television camera 31 is set toward the wave front 15 of the flux flowing out from the nozzle, and the image 15a of the wave front 15 obtained from the television camera 31
And the check points 43 and 44 set to the allowable lower limit and the upper limit of the fluctuation of the wavefront 15 are displayed on the monitor television 33 via the image processing device 32, and the image 15a of the wavefront is checked on the monitor television 33. At the time of contact with the points 43, 44, a pulse height control signal is output from the image processing device 32, the flow rate of gas for foaming the flux is controlled by the pulse height control signal, and the peak wave height 15 of the flux wave front is allowed. It controls between the lower limit and the allowable upper limit.

In addition, the flux wave height control device of the present invention includes a fluxer 11 for discharging a foamed flux that is supplied with gas from a nozzle, a television camera 31 set toward the wavefront 15 of the foamed flux, and the television camera 31. The image processing device 32 for processing the wavefront image obtained from, and the image 15a of the wavefront is displayed together with the check points 43 and 44 indicating the allowable lower limit and the allowable upper limit of the fluctuation of the wavefront 15 set by the image processing device 32. A monitor television 33 and the image processing device 32 when the image 15a of the wavefront 15 on the monitor television 33 contacts the check points 43, 44.
An actuator 35 that is normally or reversely moved by a wave height control signal output from the actuator, and adjusts the flow rate of the gas that is operated by the actuator 35 and is supplied to the fluxer 11 so that the wave height of the wave surface 15 is the lower limit. A flow rate control valve 37 for controlling between the allowable upper limit and the allowable upper limit is provided.

[Action]

According to the present invention, the wavefront 15 of the flux flowing out from the nozzle 13 is captured by the television camera 31, the image 15a of this wavefront is projected on the monitor television 33, and the image processing device 32 is viewed while watching the wavefront image 15a of the television 33. Is operated to set the lower and upper checkpoints 43 and 44 in relation to the video 15a, and the monitor TV 3
On the screen of 3, when the image 15a of the wavefront 15 fluctuates in the vertical direction and reaches the check points 43 and 44,
The image processing device 32 outputs a wave height control signal for wave front rising or wave front falling, and the actuator 35, which is operated in either forward or reverse direction by this control signal, adjusts the flow rate control valve 37. For example, the wavefront image 15a
When is contacted with the lower limit check point 43, the flow control valve 37 is automatically adjusted by the actuator 35 so as to reduce the flow rate of the gas supplied to the fluxer 11, and the wave front of the flux is raised. Conversely, when the image 15a of the wavefront contacts the upper limit checkpoint 44, the flow control valve 37 is automatically adjusted by the actuator 35 so as to increase the flow rate of the gas supplied to the fluxer 11, and the wavefront is adjusted. To lower.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings.

As shown in FIG. 1 and FIG. 2, 11 is a fluxer, and this fluxer 11 is provided with a nozzle 13 inside a tank body 12 and a foaming cylinder 16 below the nozzle 13.

The foaming cylinder 16 is supplied with air or the like in its inner space, ejects innumerable bubbles from the circumferential surface of the biscuit cylinder, and causes the flux 14 in the tank body 12 to foam below the nozzle 13. Therefore, since the foamed flux flows out from the upper surface opening of the nozzle 13, if the board is conveyed so that the lower surface of the printed wiring board contacts the wavefront 15 of the foamed flux, the flux will flow to the lower surface of the printed wiring board. Can be applied.

A light 21 is provided on the upper side of the flux 11 and the light 21
To irradiate the flux wave front 15 with light.

Further, the television camera 31 is set horizontally toward the flux wavefront 15. As the TV camera 31, a charge coupled device (charge coupled device, generally
A CCD camera that uses (such as CCD) is suitable.

The television camera 31 is connected to an image processing device (a controller in a product name Video Checker) 32, and an image processed by the image processing device 32 is displayed on a monitor television (CRT) 3
Displayed in 3. The image processing device 32 and the monitor TV 33 are placed in a central control room or the like.

The image processing device 32 outputs a wave height control signal for raising or lowering the foaming wave front, and the signal causes the reversible rotation motor 35 as an actuator for wave height control to move forward or backward. The motor 35 includes a flow control valve 37 provided in an air supply line 36 for supplying a gas such as air to the foaming cylinder 16.
The movable valve element is operated to adjust the flow rate of the gas supplied to the foaming cylinder 16 of the fluxer 11, and the wave height of the wavefront 15 of the foaming flux is controlled within a certain range.
In the air supply line 36, compressed air supplied from an air pressure source 38 such as a compressor is regulated to a constant low pressure by a regulator 39 and supplied to the flow rate control valve 37.

As shown in FIG. 3, the monitor television 33 displays the image 15a of the wavefront 15 obtained from the television camera 31 in white as a light (bright) area 41. This is because the flux wavefront 15 becomes brighter due to reflected light when light is applied. On the other hand, by making the background of the wavefront 15 black, the upper side of the image 15a becomes the dark area 42 and is displayed in black.

Next, along with the image 15a of the flux wavefront 15, checkpoints 43, 44 representing the lower limit and the upper limit of fluctuation of the wavefront 15 are projected on the monitor television 33,
Then, while watching the screen of the television 33, the image processing device 32 is operated to set the check points 43 and 44 at desired positions in relation to the wavefront image 15a. The check points 43 and 44 are set in the light area 41 and the dark area 42 respectively, but a plurality of check points may be set in each area. With the video checker (product name), up to 20 points can be set.

The checkpoint 43 set in the light area 41 is
It has a dark ON switch function, and when the dark area 42 reaches this checkpoint 43, it turns ON and detects that the flux wavefront 15 has reached the allowable lower limit. Further, the checkpoint 44 set in the dark area 42 has a light (bright) on switch function, and when the light area 41 reaches the checkpoint 44, the checkpoint 44 is turned on and the flux wavefront 15 is set to an allowable upper limit. It detects that has reached.

Further, the lower limit alarm point 47 is set in the light area 41 and the upper limit alarm point 48 is set in the dark area 42, and the image 15a of the wavefront reaches the lower limit or upper limit alarm points 47, 48. An alarm sound of the image processing device 32 is sometimes emitted.

Next, a flux wave height control method will be described with reference to the flowchart of FIG.

First, the wave height of the wave front 15 is set to the optimum one while visually measuring the contact state between the flux wave front 15 and the printed wiring board that is the object to be soldered, the flux application state, etc. (S
1). In this case, the motor 35 is operated normally or reversely by operating a manual switch to adjust the flow rate control valve 37 and adjust the flow rate of gas supplied to the foaming cylinder 16.

Next, when the automatic soldering line is started and the soldering operation is started (S2), the presence or absence of the printed wiring board is detected (S3). The substrate is conveyed at a constant interval, and when the substrate is present, the light and dark image 15 of the wavefront 15 is obtained.
I can't get a, so when I don't have that board,
It is determined whether or not the wavefront image 15a captured by the television camera 31 has reached the upper limit checkpoint 44 (S4).

If the upper limit has not been reached, it is determined whether the video 15a has reached the lower limit checkpoint 43 (S5). If the lower limit is not reached, the motor 35 is not rotated in either forward or reverse direction, and the process returns to S2,
Continue to monitor foam height.

Next, the flux wave front 15 gradually descends during operation,
When the wave height of the wavefront 15 reaches the allowable lower limit, the monitor image 15a comes into contact with the lower limit checkpoint 43 set in the light area 41 and becomes dark on, and the image processing device 32 turns the motor 35 counterclockwise ( CCW) Rotation command signal is output (S6). Thereby, the flow rate control valve 37 is adjusted so as to reduce the flow rate of the air supplied to the foaming cylinder 16, and the foaming wavefront 15 is raised due to the small flow rate of the air.

The motor CCW rotation command is interrupted when there is a printed wiring board on the flux wavefront, and continued when there is no printed wiring board (S7), and the CCW rotation is continued until the wavefront image 15a returns above the lower limit check point 43. Instructions are continuously output (S8).

Returning to S4, the flux wavefront 15 gradually rises during operation, and when the wave height of this wavefront 15 reaches the allowable upper limit, the image 15a of the wavefront 15 touches the upper limit check point 44 set in the dark area 42. Then, the light is turned on, and a clockwise (CW) rotation command signal is output from the image processing device 32 to the motor 35 (S9). Thereby, the flow rate control valve 37 is adjusted so as to increase the flow rate of the air supplied to the foaming cylinder 16, whereby the foaming wavefront 15 is returned to the descending position.

The motor CW rotation command is interrupted when there is a printed wiring board on the flux wavefront, and continued when there is no printed wiring board (S10), and the CW is continued until the wavefront image 15a returns below the upper limit check point 44. The rotation command is continuously output (S11).

〔The invention's effect〕

According to the flux wave height control method of the present invention, an image of the flux wave front captured by the TV camera and projected on the monitor TV, and the check points set on the monitor TV at the allowable lower limit and the allowable upper limit of the fluctuation of the wave front, Is compared by an image processing apparatus, and the wave height control signal is output from the image processing apparatus when the image of the wave front comes into contact with the check point. Therefore, the wave height control of the flux can be unmanned. Furthermore, since the checkpoint can be set in relation to the image of the wavefront while watching the monitor TV, there is an advantage that this setting can be easily performed. In addition, because the wave height control signal output from the image processing device in relation to the image of the wavefront and the checkpoints set at the lower and upper allowable limits, the flow rate of the gas for flux bubbling can be finely controlled, so that fluctuations in the flux wavefront are almost eliminated. Higher precision wave height control is possible as it can be eliminated.

Further, according to the flux wave height control device of the present invention, since a series of flux wave height control system including a television camera, an image processing device, an actuator and a flow control valve is provided,
With this wave height control system, it is possible to control the wave height of the flux wavefront with high accuracy, and it is possible to enhance the reliability in flux application.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a flux wave height control device of the present invention, FIG. 2 is a sectional view of the fluxer, FIG. 3 is a front view showing a screen of a monitor television, and FIG. 4 is a wave height thereof. It is a flow chart of a control program. 11 …… Fluxer, 13 …… Nozzle, 15 …… Flux wavefront, 15a …… Wavefront image, 31 …… TV camera, 32 ……
Image processing device, 33 …… Monitor TV, 35 …… Reversible rotary motor as actuator, 37 …… Flow control valve, 4
3,44 …… Checkpoint.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Teruo Oi 1410 Inada, Katsuta City, Ibaraki Prefecture Inside the Tokai Plant, Hitachi, Ltd. (72) Minoru Adachi 1-1943 Higashi-Oizumi 1-chome, Nerima-ku, Tokyo Stock Company In Tamura Seisakusho (72) Inventor, Yoshihiro Miyano, 16 Samuragahara, Iruma City, Saitama Prefecture, 2 Tamura Kaken Co., Ltd. (56) Reference JP 59-193760 (JP, A) 60159 (JP, U)

Claims (2)

[Claims] 1. A television camera is set toward the wave front of the flux flowing out of a nozzle, and an image of the wave front obtained from the television camera and check points set at an allowable lower limit and an allowable upper limit of the fluctuation of the wave front, The image is displayed on a monitor television via an image processing device, and when the image of the wavefront comes into contact with the checkpoint on the monitor television, a crest control signal is output from the image processing device, and a flux is generated by the crest control signal. A wave height control method for flux, comprising controlling a flow rate of a gas for causing the wave height of the flux wave front to be controlled between the allowable lower limit and the allowable upper limit. 2. A fluxer for supplying a gas to supply a foamed flux flowing out from a nozzle, a television camera set to face the wavefront of the foamed flux, and an image processing apparatus for processing a wavefront image obtained from the television camera. And a monitor television displaying the image of the wavefront together with checkpoints indicating the lower limit and the upper limit of the fluctuation of the wavefront set by the image processing device, and the image of the wavefront touches the checkpoint on the monitor television. At that time, the wave height of the wave front is adjusted by adjusting the flow rate of the gas that is actuated by the actuator and is forwardly or reversely moved by the wave height control signal output from the image processing apparatus and is supplied to the fluxer. And a flow control valve for controlling between an allowable lower limit and an allowable upper limit. Wave height control unit of the box.