JPS62279864A - Apparatus for controlling coating quantity of adhesive for temporarily clamping chip part - Google Patents

Abstract

PURPOSE:To emit a predetermined amount of an adhesive in proper quantities regardless of the residual quantity of the adhesive, by automatically correcting the applying time of the positive atmospheric pressure supplied into a syringe corresponding to actual coating quantity. CONSTITUTION:When a coating apparatus is operated, the integrated value of the number of coating times at this point of time is supplied to an operational processor 8. The operational processor 8 reads an optimum fundamental open time from a memory 10 on the basis of the integrated value supplied from a pulse counter 9 and outputs the open time control signal responding to the optimum open time obtained by correcting said optimum fundamental open time on the basis of the temp. signal outputted from a temp. sensor 11. Then, the driving signal of the pulse width responding to said control signal at the point of time when an open time timing signal is supplied is supplied to a switching element 6 from a solenoid valve open time (t) controller 7. By this method, positive atmospheric pressure is applied to a syringe 3 through a solenoid valve 5 to forcibly extrude an adhesive.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an apparatus that can always optimally control the amount of adhesive applied for temporarily fixing a chip component to a substrate.

<Conventional technology> When applying adhesive to a board to temporarily fix chip components, a dispenser that applies positive pressure inside a syringe to push out the adhesive is often used. Since the syringe filled with adhesive can be replaced in a cart or ridge method to replenish the adhesive, there is an advantage that management work is simplified.

By the way, in devices that apply positive pressure primarily to the inside of the syringe, when the amount of adhesive remaining in the syringe decreases, the air space that expands as the amount of adhesive decreases acts as a damper. Therefore, there is a problem that the discharge amount decreases.

Therefore, conventionally, the opening signal of the electromagnetic valve that controls the pressure application time is applied to an adder, and the remaining amount of adhesive in the syringe is indirectly determined from the value displayed on this adder. The remaining amount of adhesive was estimated empirically and a pressure application switch using a digital switch or the like was manually adjusted to prevent excess or deficiency in the amount of adhesive applied.

<Problems to be Solved by the Invention> However, in this way, manual adjustment by an operator requires human monitoring even when automatically operating an adhesive applicator. It is not possible to reduce man-hours, and furthermore, incorrect adjustment of the switch can cause chip components to shift or fall due to insufficient coating amount, or lead to soldering defects due to excessive coating amount, which adversely affects quality. There was a point.

The present invention has been made to solve these conventional problems, and provides a control device that can apply a predetermined amount of adhesive without excess or deficiency, regardless of the remaining amount of adhesive (number of applications). The purpose is to improve the reliability of coating equipment.

<Means for Solving the Problems> In order to achieve the above object, the present invention includes a pulse counter that adds up the open signal applied to the electromagnetic valve, and a pulse counter that adds up the opening signal applied to the electromagnetic valve, and a pulse counter that adds the opening signal applied to the electromagnetic valve, and a an arithmetic processing device that outputs an opening time control signal responsive to the calculated opening time of the electromagnetic valve; and an application time of the opening signal supplied to the electromagnetic valve based on the opening time control signal output from the arithmetic processing device. A controller for controlling the amount of adhesive applied for temporarily fixing chip components is configured.

With this configuration, the application time of the positive air pressure supplied into the syringe (the opening time of the electromagnetic valve) can be automatically adjusted according to the actual application amount (the amount of adhesive remaining in the syringe). The correction is made so that just the right amount of adhesive is discharged.

<Example> An example of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a configuration diagram of essential parts showing an embodiment of an adhesive application amount control device for temporarily fixing chip components according to the present invention, in which adhesive is discharged to a predetermined position of a substrate 2 mounted on a table 1. A solenoid valve 5 is interposed in the middle of the air passage 4 that connects the syringe 3 filled with TL and an air tank (not shown), and positive air pressure is applied to the inside of the syringe 3 via this TL solenoid valve. .

An open time timing signal is supplied at predetermined intervals from a control section of the applicator main body (not shown) to a controller 7 that supplies a drive signal to a switching element 6 that opens and closes the energizing circuit of the electromagnetic valve 5. The width of the driving pulse applied to the switching element 6 (the opening time of the L magnetic valve 5) is controlled based on the timing signal and an opening time control signal output from the arithmetic processing unit 8, which will be described later. In addition, by connecting the input terminal of a pulse counter 9 to the output terminal of the controller 7, an arithmetic processing unit generates an integrated signal of the number of applications corresponding to the amount of adhesive consumed from the time when the syringe 3 is replaced to that time. Supply to 8.

The arithmetic processing unit 8 is connected to a memo January 0 in which an optimal map of integrated value-pressure application time is stored in advance, and calculates the optimal basic opening time at that time based on the integrated signal output from the pulse counter 9. calculate.

Then, after correcting the optimum basic opening time based on the output of the temperature sensor 11 that detects the internal temperature of the syringe 3, the controller 7 receives a signal corresponding to the corrected optimum opening time as an opening time control signal. supply to. 1
2 is a reset switch for the pulse counter 9.

In the above configuration, when the coating device is operated, the calculated value of the number of coatings at that time is supplied to the arithmetic processing device 8. The arithmetic processing unit 8 reads the optimum basic opening time from the memory lO based on the integrated value supplied from the pulse counter 9, corrects the optimum basic opening time based on the temperature signal output from the temperature sensor 11, and obtains the optimum basic opening time. When the open time timing signal is supplied, a drive signal having a pulse width responsive to the open time control signal is outputted from the controller 7 to the switching element 6.
supplied to

Further, the electromagnetic valve 5 is opened when the switching element 6 is on, and applies positive air pressure supplied from an air tank (not shown) to the syringe 3. Therefore, when positive air pressure is applied via the electromagnetic valve 5, the syringe 3
The internal pressure increases and the adhesive is forcibly pushed out and applied onto the substrate 2.

On the other hand, as shown in FIG. 2, the memory stores the number of applications (
Map data is stored in which the application time is increased in stages as the integrated value (integrated value) increases. Therefore, even if the number of applications increases and the volume of the air chamber inside the syringe 3 increases, the pulse width of the drive signal output from the controller 7 increases and the opening time of the electromagnetic valve 5 becomes longer. Positive pressure application time becomes longer.

Therefore, even if the number of applications increases and the remaining amount of adhesive decreases, and the volume of the air chamber increases accordingly, the application time of positive pressure will be extended and corrected by the amount corresponding to this increase in volume. A predetermined amount of adhesive is always discharged (applied).

Generally, as the temperature rises, the viscosity of the adhesive decreases and the amount of adhesive applied (discharge amount) tends to increase. As shown in the embodiment, a temperature sensor 11 is provided to detect the temperature inside the syringe 3 (adhesive temperature), and the opening time control signal supplied to the controller 7 is corrected according to the output of this temperature sensor 11. Therefore, it is desired to increase the control accuracy of the coating amount. Furthermore, if the amount of adhesive applied is changed, or if the specifications of the adhesive are changed, the map data may be changed accordingly.

<Effects of the Invention> As explained above, according to the present invention, as the number of applications of adhesive increases, the opening time of the electromagnetic valve is automatically extended to lengthen the application time of positive air pressure. Therefore, even if the remaining amount of adhesive decreases and the volume of the air chamber inside the syringe increases, a predetermined amount of adhesive is always discharged, making it possible to maintain the amount applied to the substrate at a predetermined value. can.

In addition, since there is no need for manual adjustment work as in the past, it is possible to prevent quality deterioration due to adjustment errors.Furthermore, there is no need to manually monitor the coating equipment, so automatic operation can save labor. It can be carried out.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a main part of an embodiment of an adhesive coating amount control device for temporarily fixing chip parts according to the present invention, and FIG. 2 is a data map similarly stored in a memory.

Claims (2)

[Claims] (1) By supplying positive air pressure into a syringe filled with adhesive via a solenoid valve, an amount of adhesive that responds to the opening time of the solenoid valve is discharged from the syringe and applied onto the substrate. In the adhesive applicator for temporary fixing of chip components, the apparatus includes a pulse counter that adds up the opening signal applied to the electromagnetic valve, and an opening signal of the electromagnetic valve calculated based on the output of the pulse counter and the contents of the memory. an arithmetic processing device that outputs an opening time control signal responsive to time;
An adhesive application amount control device for temporarily fixing chip components, comprising: a controller that controls an application time of an opening signal supplied to the electromagnetic valve based on an opening time control signal output from the arithmetic processing device. (2) The arithmetic processing device has a temperature correction function that increases or decreases the opening time control signal supplied to the controller according to the temperature inside the syringe. Adhesive application amount control device for temporary fixing of chip parts.