JP2910032B2 - Automatic coating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic coating apparatus, and more particularly, to an automatic coating apparatus for automatically applying a coating agent to a circuit board or the like by a dispenser or the like.

[0002]

2. Description of the Related Art A conventional automatic coating apparatus has a dispenser for applying a coating agent, and a discharge port of the dispenser which has an X,
The robot has a moving means for moving and rotating in the Y, Z, and θ directions.

In this type of apparatus, it is necessary to input a position (coordinates) at which the dispenser should move. As a conventional coordinate input method, an input method called teaching has been generally used. In the teaching, the object to be coated such as a circuit board (object to be coated) is actually mounted on the automatic coating device,
This is a method in which the robot controls the robot to move the projecting opening of the dispenser to a position where the dispensing is desired, and makes the robot memorize coordinate values. In addition, there is a method in which the application position is directly measured with a drawing or the like, and the coordinate data of the robot is input numerically.

[0004] In addition, the other control parameters such as the discharge pressure of the dispenser and the quality of the moving speed of the robot appear as the application width. Therefore, the actual application is performed, and it is checked whether the required application width is obtained. Adjustment of the discharge pressure of the dispenser and the movement speed of the robot had to be performed manually.

[0005] Further, since the viscosity of the coating material changes with respect to the temperature, it is necessary to check whether or not the coating width is a required one and to adjust the discharge pressure of the dispenser and the moving speed of the robot in accordance with the temperature environment of the work place. Or, it was necessary to control the temperature environment of the workplace.

[0006]

The first problem of the above-mentioned conventional system is that the conventional coordinate input system requires a great deal of input time and skill. The reason is that in the coordinate input method, it is impossible to input coordinate values to the robot unless a series of coating operations are performed on an object to be actually coated, while a method of directly inputting coordinate values is used. In the case of (1), since coordinates are read from a drawing or the like, converted into robot coordinates, and then input to the robot, a great deal of time and operator experience is required.

[0007] The second problem is that the conventional control method of the automatic coating apparatus requires a great deal of adjustment time and experience. The reason is that in the conventional control method, the discharge pressure of the dispenser and the movement speed of the robot were manually adjusted to obtain a required coating width, so that there were many control parameters and the discharge pressure of the dispenser was large. This is because it is necessary to perform an adjustment operation in consideration of characteristics such as the moving speed of the robot. Therefore, experience is required, and a great deal of adjustment time is required to determine the control parameters while actually applying and checking.

The third problem is that, in the conventional automatic coating apparatus, it is necessary to control the temperature of the workplace in response to a change in the temperature of the workplace, or to reset control parameters of the automatic coating apparatus. The reason is that the viscosity of the coating material changes remarkably depending on the temperature, and therefore, when the temperature changes when the control parameters such as the dispenser discharge pressure and the moving speed of the robot are constant, the coating width changes. . For this reason, it is necessary to make the temperature of the workplace constant or to change the control parameter to meet the viscosity corresponding to the temperature change.

Therefore, a first object of the present invention is to calculate coordinates directly from drawings or the like without actually performing a series of coating operations as in conventional teaching, and to convert the coordinates into robot coordinates. Another object of the present invention is to provide an input method for instructing a coating position on image data and determining coating coordinate data to a robot.

A second object is to input coating data such as a coating agent, a coating width or a coating speed, and to automatically determine an optimum moving speed and a discharge pressure, thereby achieving a conventionally required re-processing. An object of the present invention is to provide an automatic coating device that does not require adjustment or experience.

A third object of the present invention is to provide an automatic coating apparatus which does not require re-adjustment of control parameters even when a temperature change in a work place changes.

[0012]

According to the present invention, there is provided a dispenser for applying a coating agent, means for imaging an application target and displaying the image on a screen,
An automatic coating apparatus is constituted by means for designating the application position on the screen and moving means for moving the discharge port of the dispenser to the designated position.

Further, there is provided an input means for inputting application data such as the type of the coating agent, the application speed or the application width, and the moving speed of the moving means and the discharge pressure of the dispenser are determined based on the application data. Control the dispenser.

Further, a detecting means for detecting the temperature of the surrounding temperature of the coating material is provided, and the moving speed of the moving means and the discharge pressure of the dispenser are determined according to the temperature.

[0015]

Next, embodiments of the present invention will be described with reference to the drawings. The automatic coating apparatus shown in FIG. 1 includes a dispenser 5 for applying a coating agent and an application target 7.
(Here, a circuit board) and a camera 3
Image processing apparatus 2 for obtaining the position (coordinates) of application target 7 from the image data of the above, and display means (CRT or the like) for displaying an image
10, input means (mouse, keyboard, etc.) 8 for specifying a coating position on a screen, and for inputting coating data such as a type of coating agent, a coating speed or a coating width, and a dispenser so as to be at the specified position. X, Y, Z, θ
Robot 1 as moving means for moving and rotating in the direction
And a temperature sensor 6 for detecting the ambient temperature of the coating material.

The control device 4 is constituted by, for example, a computer or the like, and calculates the moving speed and the discharge pressure of the discharge port of the dispenser based on data from the input device 8 and controls the robot 1 and the dispenser 5 accordingly. .

Next, the operation will be described with reference to the flowcharts of FIGS. First, an operator selects a required application agent from an operation menu displayed on the display device (step 201). FIG. 5 shows an example of a screen of the display device,
Enter the number of the coating agent to be used in column 11. Next, the operation menu is switched, and the screen is changed to the coordinate input menu shown in FIG. In the coordinate input menu, an image 7a in which the application target 7 projected by the camera 3 is image-processed via the image processing device 2 is displayed, and the coordinates of the application target 7 are input to the control device 4 (step 202). ). Next, the application start point 11 and the end point 12 are set on the display image on the screen by the pointer using the input means 8 (for example, a mouse) (step 203). After the setting is completed, the coating start point and the end point are line 1
3 is displayed. At this time, if the application position is inappropriate, it is corrected (step 204).

Next, the control device 4 calculates application conditions (step 205). Here, for example, from the pixels of the application start point 11 and the end point 12 specified by the mouse 8, each point is converted into a coordinate value, and converted into the robot control data of the movement start point and the end point in the XY direction of the robot. Convert. Further, basic data of the robot (such as an offset value of the robot) is created (step 206). Next, temperature and viscosity data corresponding to the coating agent are read (step 207). This data defines the relationship between the use temperature and the viscosity for each coating agent as shown in data 71 in FIG.
Is stored in the storage means. Then, the temperature is read from the temperature sensor, and the viscosity is calculated based on the data 71 (step 208). The calculation of the viscosity is, for example,
As shown in FIG. 7, the viscosity η and the temperature T are determined based on the following equation (1) in which the temperature characteristics (actually measured values and catalog values) of the coating agent are interpolated by a polynomial. η = f (T) (1)

Next, a desired coating width and coating speed are input (step 209). This input is performed using a coordinate input menu shown in FIG. For the coating speed, see column 14
One of the levels of "low speed", "medium speed", and "high speed" is selected. When each level is selected, the maximum value (or representative value) of the application speed is determined. As for the input of the application speed, a numerical value may be input instead of selecting the level as described above. For the application width, a desired numerical value is entered in the column 15.

In step 210, the control device 4
Is the input application width and application speed, and step 20
The discharge pressure of the dispenser is calculated based on the viscosity obtained in step 8. FIG. 8 shows an example of the calculation method. The data 81 shows the relationship between the application width and the discharge pressure at each speed level, and a plurality of the data 81 are stored according to the viscosity. The calculation of the discharge pressure is as follows: discharge pressure P, application width B,
The application speed V and the viscosity η are determined by the following equation (2) in which the application characteristics of the dispenser are interpolated by a polynomial. P = f (B) × K (V) × η (2)

Next, a robot moving speed profile (for example, a moving speed is designated every time elapses) from a discharge pressure and a coating speed, and a dispenser discharge pressure profile (for example, a dispensing pressure is designated every elapse time) ) Is created (step 211). FIG. 9 is a flowchart showing a method of creating the moving speed profile and the discharge pressure profile. First, the speed characteristics (controllable characteristics) of the robot are stored in the storage unit of the control device 4 and read (step 801). The speed characteristics of the robot include a time from when a commanded speed is given to when the speed is reached (rise time, fall time), and the like. Next, the moving distance is calculated from the coordinate data input in step 202 (FIG. 2) (step 802), and the moving distance is divided by the moving speed to obtain the application time (step 803).

Next, a moving speed profile is created from the coating time, the speed characteristics, and the selected coating speed (step 8).
04). In this moving speed profile, for example, a moving speed at a certain point in time is specified by a ratio to a selected application speed (a maximum speed or a representative speed). Next, the discharge pressure of the dispenser with respect to the moving speed at each point in the moving speed profile is obtained by the equation (2) (step 805), and a dispenser discharge pressure profile with respect to the speed is created (step 806).

The flowchart of FIG. 3 (step 2)
Returning to 12), it is checked whether or not there is a next input operation (whether or not there is a next application position). If there is a next input operation, the process returns to step 202 to repeat the same operation, and if not, the control data created as described above is edited (step 213). Next, it is checked whether or not to actually shift to the coating operation (step 214). If not, the process ends only with data creation. If to shift, control data is sent to the robot and the dispenser (step 215).

Next, it is determined whether or not the coating operation by the robot and the dispenser has been completed (step 21).
6) If the operation is completed, the operation of the apparatus is completed.
If not, the process moves to the next coating operation. Before that, a change in the ambient temperature of the coating material is detected, and if there is a temperature change, the control data is updated. That is, it is determined in step 217 whether or not there has been a temperature change based on the signal from the temperature sensor 6.
(FIG. 3). If there is a temperature change, a moving speed and a discharge pressure profile are created in the same procedure as in steps 207 to 211 described above.

That is, the temperature and viscosity data corresponding to the coating agent are read (step 218), the temperature is read from the temperature sensor, and the viscosity is calculated from the data (step 219). Further, the discharge pressure of the dispenser is calculated based on the already input application width and application speed and the viscosity obtained in step 219 (step 220). Then, a moving speed profile of the robot and a discharge pressure profile of the dispenser are created from the discharge pressure and the application speed (step 221), and control data other than the coordinate data is updated (step 222). Thereafter, step 214
And the same operation as described above is performed.

According to the above, the operator does not need to determine the coordinate values of the object to be applied from the drawing or the like, and need to determine the coordinate values while actually performing a series of application operations as in the conventional teaching. Absent. In addition, the coating agent, coating width,
When the application speed is input, an appropriate moving speed and discharge pressure profile are created from the database and control method in the control unit, and the dispenser and robot are controlled on a time axis.
There is no need for the operator to adjust each parameter so as to obtain the optimum coating state of the automatic coating apparatus.

In the above description, as the application data,
Although the type of the coating agent, the coating speed, the coating width, and the like have been described, other data may be used as the coating data. Further, one or more of the application data may be input by the operator, and the other may be set by the apparatus. Alternatively, all the application data may be set in the apparatus in advance as fixed values, and the operator may input only the application start point and the end point.

[0028]

The first effect of the present invention is that the starting point and the ending point of the object to be applied can be designated on the image,
Data entry should be easier. The reason is that the applied position is processed by performing image processing on the object to be applied, measuring pixels, performing coordinate conversion, detecting the coordinates of the specified point on the image, and connecting the start point and the end point with a line. This is because it can be made visible and can be easily corrected and confirmed.

A second effect of the present invention is that, when the application data is input, the control unit determines parameters for controlling the robot and the dispenser. This facilitates data entry. The reason is that the optimum moving speed and the optimum discharge pressure can be determined based on the application data. Therefore, optimal coating can be performed without readjustment or skill conventionally required.

A third effect of the present invention is that even if the temperature of the workplace changes, it is not necessary to readjust the control parameters.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the coating apparatus.

FIG. 3 is a flowchart showing the operation of the coating apparatus.

FIG. 4 is a flowchart showing the operation of the coating apparatus.

FIG. 5 is a diagram showing a coating material selection menu.

FIG. 6 is a diagram showing a coordinate input menu.

FIG. 7 is a diagram illustrating a method of calculating viscosity.

FIG. 8 is a view for explaining a calculation method of a discharge pressure.

FIG. 9 is a view for explaining a method of creating a moving speed profile and a discharge pressure profile.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Robot 2 Image processing device 3 Camera 4 Control device 5 Dispenser 6 Temperature sensor 7 Application object (circuit board etc.) 8 Input device (mouse, keyboard etc.) 9 Dispenser discharge port 10 Display device (CRT etc.) 11 Application start point 12 End point

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B05C 5/00-5/04 H05K 3/34

Claims (3)

(57) [Claims] 1. A dispenser for applying a coating agent, means for imaging an application target and displaying the image on a screen, means for specifying an application position on the screen, and a discharge port of the dispenser at a specified position And a moving means for moving the liquid. 2. An input means for inputting application data such as a kind of an application agent, an application speed or an application width, and a moving speed of the moving means or a discharge pressure of the dispenser is determined based on the application data to perform the movement. 2. The automatic coating apparatus according to claim 1, further comprising: means for controlling the dispenser. 3. The apparatus according to claim 2, further comprising a detecting unit configured to detect a temperature of an ambient temperature of the coating material, wherein the control unit determines a moving speed of the moving unit or a discharge pressure of the dispenser according to the temperature. The automatic coating device according to the above.