JPH10296159A - Coating device of adhesive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a coating position and a coating shape definite and to enable a coating device to stably apply by providing a temp. controller for keeping an adhesive at a specified viscosity at an injection time and making tearing-off from a discharge port stable, in the coating device in which the inside of a housing container having a discharge port at the bottom is pressurized and the adhesive is pushed out from the discharge port. SOLUTION: An adhesive coating part mounted to a head of an XY robot has a coating unit 1 forming a discharge port 2 at the tip and an adhesive 3 is pushed out from the discharge port 2 by pressure of a plunger 4 working in the coating unit 1. At this time, a discharge port heater 5 is provided at the outer periphery of the discharge port 2, also a housing 6 is provided on the outer periphery of the coating unit 1 and a hot wind is fed into the housing 6 and adjusts the temp. in the housing 6 so as to become a fixed temp. That is, a temp. sensor 7 for temp. adjustment is provided in the vicinity of the tip of the discharge port at the inside of an opening part for the discharge port 2 of the housing 6 and the temp. of the hot wind is adjusted so as to become always the fixed temp. in accordance with the output of the temp. sensor 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive applying device for temporarily fixing an electronic circuit component to a substrate with an adhesive and mounting the same.

2. Description of the Related Art Conventionally, in a process of soldering an electrode portion of an electronic component on a substrate, the electronic component is mounted and temporarily fixed on an adhesive applied to a mounting position of the electronic component on the substrate.
This has been done by immersing in a solder bath in which the solder is molten. An adhesive applying apparatus using a conventional adhesive applying method will be described with reference to FIGS. 3 and 4, reference numeral 1 denotes a coating unit having a discharge port 2 formed at the tip, and 3 denotes an adhesive filled in the coating unit 1, and the adhesive is discharged from the discharge port 2 by the pressure of a plunger 4 operating in the coating unit 1. Extruded. 5 is a discharge port heater provided on the outer periphery of the discharge port 2, 8 is a substrate, 9 is the substrate 8
XY plane parallel to the component mounting surface
An XY robot having positioning means that moves in the direction,
It has an X-direction moving unit 11 and Y-direction moving units 12a and 12b provided on the X-direction moving unit 11, and the X-direction moving unit 7 can move the head 10 on which the coating unit 1 is mounted so as to be movable. Installed. The operation of the plunger 4 in the application unit 1 is controlled by a combination of a spring repulsion and compressed air. The operation of the conventional adhesive coating apparatus configured as described above will be described. The substrate 8 transferred from the previous process is fixed at a predetermined position of the XY robot 9, and the X direction moving means 11 and the Y direction moving means 12 are fixed.
The ejection port 2 is moved to a position above the electronic component mounting position on the substrate 8 by moving the head 10 at a and 12b. Next, the open / close valve is opened, and compressed air is sent into the application unit 1 to raise the plunger 4. Next, the plunger 4 that has risen completely is returned to the original position by using the repulsive force of the spring. The adhesive 3 in the application unit 1 is jetted from the discharge port 2 by the pressure generated at this time, and the application is performed at the electronic component mounting position. At this time, the amount of the adhesive 3 applied to the substrate 8 is adjusted depending on conditions such as the stroke of the plunger 4, the opening time of the compressed air opening / closing valve, the temperature of the discharge port heater 5 of the discharge port 2, and the like. afterwards,
The discharge port 2 is moved to the next electronic component mounting position, and each operation of spraying and applying the adhesive 3 is repeated to complete the application of the adhesive 3 to all the electronic component mounting positions. And the substrate 5
Is transferred to the next electronic component mounting step, and the electronic component is mounted on the adhesive 3. Then, the substrate 5 on which the electronic components are mounted
Is further transferred to an adhesive curing step, and the electronic component is mounted on the substrate 8.

The above-mentioned adhesive coating apparatus has a problem that the jetting state is not stable depending on the adhesive used and the temperature of the use environment. Adhesives used in these are sensitive to a change in viscosity with temperature, and a change in temperature means a change in viscosity. The adhesive is heated by the heater at the discharge port and maintained at a constant viscosity, and spray coating is repeated,
After the ejection, a part of the ejection tear remains on the ejection port side, and a fixed amount of adhesive is formed at the tip of the ejection port. This pool is exposed to the outside air during standby for injection, and the temperature (viscosity) changes depending on the time, causing a variation in tearing during injection, which has a problem of affecting the injection position and coating shape. This problem tends to occur when the difference between the discharge port heater temperature and the outside air temperature is large. The present invention has been made in order to solve such a problem, and covers the tip of the discharge port and regulates the temperature in the tip so that the adhesive pool at the tip of the discharge port has a constant temperature (viscosity). It is an object of the present invention to provide an adhesive coating apparatus capable of constantly performing coating at a stable coating position and coating shape by keeping the tearing method at the time of spraying constant and eliminating jetting variations.

According to the present invention, there is provided an adhesive applying apparatus, comprising: an adhesive container having a discharge port on a bottom surface;
In an adhesive application device that pressurizes the inside of the storage container, extrudes the adhesive from the discharge port by applying pressure, and spray-applies it to the circuit board, the adhesive always keeps a constant viscosity at the time of spraying and stabilizes tearing from the discharge port. According to the present invention, it is possible to obtain a stable adhesive application without jetting variation.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention provides a container for storing an adhesive having a discharge port on the bottom surface, pressurizing the inside of the storage container, and extruding the adhesive from the discharge port by pressing force. An adhesive coating device for spray-coating a circuit board, wherein a temperature control device for maintaining an atmosphere at the tip of the discharge port at a constant temperature is provided, and the temperature of the tip of the discharge port is controlled. Accordingly, the adhesive has an effect of always maintaining a constant viscosity at the time of spraying, stabilizing tearing from the discharge port, and stabilizing an application position and an application shape. Claim 2
The invention described in (1) is characterized in that the outlet is covered by a housing provided with hot air supply means and a temperature control device provided with a temperature sensor provided near the tip of the outlet of the housing, except for the outlet of the adhesive storage container. The adhesive coating apparatus according to claim 1, wherein the tip end atmosphere is maintained at a constant temperature,
Since the front end of the discharge port is covered with the housing, the discharge port has an effect of being able to jet the adhesive in a stable state without being affected by the outside air. Further, since the temperature at the tip of the discharge unit is adjusted by a temperature sensor provided near the tip of the discharge unit, it has the effect of always being able to maintain a constant temperature. (Embodiment) The adhesive application section configured as described above is
It is mounted on a head 10 provided on an XY robot 9 constituting an adhesive application device as shown in FIG. FIG. 1 is a cross-sectional view showing the configuration of a coating unit according to the present invention. In FIG. 1, reference numeral 1 denotes a coating unit having a discharge port 2 formed at the tip, and 3 denotes an adhesive filled in the coating unit 1. And is pushed out from the discharge port 2 by the pressure of the plunger 4 operating at the time. Reference numeral 5 denotes a discharge port heater provided on the outer circumference of the discharge port 2. A housing 6 is provided on the outer circumference of the coating unit 1 so as to cover the entirety except for the discharge port 2. Hot air is fed into the housing 6, and 6 is adjusted to a constant temperature. Reference numeral 7 denotes a temperature sensor for temperature adjustment provided near the tip of the discharge port inside the opening for the discharge port 2 of the housing 6. Next, a specific example of the present invention will be described with reference to FIG. FIG. 2 is a diagram showing the steps of the coating operation. The interior of the housing is heated by hot air, and the atmosphere at the tip of the discharge port is set to be always at a constant temperature by a temperature sensor provided near the tip of the discharge port. In the figure,
(A) is the origin state, and the adhesive pool at the tip of the discharge port is always maintained at a constant temperature (viscosity). In (b), the plunger is raised, and then, when the plunger is completely lowered in (c-1), pressure is generated, and the adhesive is instantaneously spray-applied. Return. The temperature in the housing is controlled by the temperature sensor 7 near the nozzle tip so as to be always constant. The temperature is preferably 30 to 50 ° C., although it varies depending on the type of adhesive and environmental conditions.

According to the present invention, there is provided an adhesive applying apparatus comprising: an adhesive container having a discharge port on a bottom surface;
An adhesive application device that extrudes adhesive from a discharge port by applying pressure and spray-coats the circuit board with a temperature control device that constantly maintains the adhesive at a constant viscosity during spraying and stabilizes tearing from the discharge port. This is an adhesive coating device characterized by the following features:
The adhesive has a constant viscosity at the time of spraying, stabilizes tearing from the discharge port, stabilizes the application position and application shape, and achieves an effect of enabling stable application.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a structure of a coating unit according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a step of a coating operation in the embodiment of the present invention.

FIG. 3 is a perspective view showing a coating apparatus.

FIG. 4 is a cross-sectional view showing a coating unit in a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Application unit 2 Discharge port 3 Adhesive 4 Plunger 5 Discharge port heater 6 Housing 7 Temperature sensor 8 Substrate 9 XY robot 10 Head 11 X direction moving means 12 Y direction moving means

Claims (2)

[Claims] 1. An adhesive container having a discharge port on the bottom surface of an adhesive, and an adhesive coating apparatus for pressurizing the inside of the storage container, extruding the adhesive from the discharge port by pressurizing force, and spray-coating the circuit board. An adhesive coating device, comprising a temperature control device for maintaining the atmosphere at the tip at a constant temperature. 2. A tip end of a discharge port formed by a housing provided with hot air supply means and entirely covered with a hot air supply means, and a temperature control device provided near a tip end of the discharge port of the housing. 2. The apparatus for applying an adhesive according to claim 1, wherein the atmosphere of the section is maintained at a constant temperature.