JP2006068700A - Mixed coating method and mixed coater for two-liquid type adhesive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mixed coating method for a two-liquid type adhesive capable of preventing solidification in a mixer without requiring an excessive material, and a mixed coater. <P>SOLUTION: The mixed coating method for the two-liquid type adhesive uses a coating gun S3 for mixing a main agent fed from main agent feeding means 15A-19A and a curing agent fed from curing agent feeding means 15B-19B and coating a work W to be adhered with the mixture as an adhesion bead. In the method, feeding of the curing agent from the curing agent feeding means is stopped before completion of coating by the coating gun S3 and the inside of the coating gun S3 is filled with the main agent fed from the main agent feeding means 15A-19A at completion of coating by the coating gun S3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mixed application method and a mixed application apparatus for a two-component adhesive that discharges while mixing a two-component adhesive.

  2. Description of the Related Art Conventionally, a two-component adhesive mixed coating apparatus that discharges while mixing a two-component adhesive composed of a main agent and a curing agent is known (see Patent Documents 1 and 2).

These are supplied to the mixer while measuring a specified amount from the stock solution tank containing the main agent and curing agent, mixed with the two liquids by the mixer, discharged from the nozzle to the bonding site, and applied to the workpiece from the start of application. An adhesive bead in which the main agent and the curing agent are mixed at a constant rate until completion is formed. Further, in Patent Document 1, the stock solution tank receives a deformable container containing the main agent and the curing agent in each cartridge, and moves the piston by a motor to press the deformable container, respectively, thereby extruding the main agent and the curing agent. To supply to the mixer.
Japanese Patent Laid-Open No. 9-131558 Japanese Utility Model Publication No. 59-20343

  However, in the above-described conventional example, the two liquids that have been mixed and have been cured are retained in the mixer. Therefore, when the liquid is not used for a long time, the two liquids mixed in the mixer are solidified, and the mixer is There was a problem that application could not be resumed without replacement. In order to solve this problem, it is conceivable that the two liquids mixed in the mixer are purged (discarded) from the mixer before solidifying, but extra materials are required for purging. Met.

  Accordingly, the present invention has been made in view of the above problems, and provides a mixed coating method and a mixed coating apparatus for a two-component adhesive that can prevent solidification in a mixer without requiring extra materials. Objective.

  The present invention relates to a method for mixing and applying a two-component adhesive comprising a coating gun that mixes a main agent supplied from a main agent supply means and a curing agent supplied from a curing agent supply means and applies them to a work to be bonded as an adhesive bead. The supply of the hardener from the hardener supply means is stopped before the end of application by the application gun, and the inside of the application gun is filled with the main agent supplied from the main agent supply means at the end of application by the application gun.

  Therefore, in the present invention, the supply of the curing agent from the curing agent supply means is stopped before the application by the application gun is completed, and the inside of the application gun is filled with the main agent supplied from the main agent supply means at the end of the application by the application gun. Therefore, even if it is left for a long time after application, the adhesive does not solidify in the application gun, and waste of materials due to purging the application gun can be prevented.

  Hereinafter, the mixed application method of the two-component mixed adhesive of the present invention and the bonded structure thereof will be described based on each embodiment.

(First embodiment)
FIG. 1 to FIG. 5 show a first embodiment of a two-component adhesive mixing application method and an adhesion structure thereof to which the present invention is applied. FIG. 1 is a schematic configuration diagram of a two-component adhesive mixing application device. 2 is a circuit configuration diagram of a two-component adhesive mixing and coating apparatus, FIG. 3 is a cross-sectional view of a workpiece showing an example of an object to be bonded, and FIG. 4 is a control pattern of the amount of main agent and curing agent supplied to a coating gun. FIG. 5 is a plan view of an adhesive bead in an applied state according to the control pattern of FIG.

  In FIG. 1 and FIG. 2, the two-component mixed adhesive application apparatus stores a two-component supply stage S1 for supplying a main agent and a curing agent, respectively, and a main agent and a curing agent supplied from the two-component supply stage S1, respectively. The operation of each of the stages S1 to S3 includes: a pumping stage S2 that pumps while metering as required, a mixing nozzle (coating gun) S3 that mixes and discharges the main agent and the curing agent supplied from the pumping stage S2. And a mixed discharge controller C1 to be controlled.

  The two-liquid supply stage S1 pushes down the pistons fitted in the pail cans 10A and 10B storing the main agent and the curing agent, respectively, so that the main agent and the curing agent accommodated in the pail cans 10A and 10B are connected to the pipe 11A, It can be supplied to the coating cylinders 15A and 15B of the pressure feeding stage S2 via 11B. Each of the pistons can be pushed down by actuators 12A and 12B that operate according to a command from the mixed discharge controller C1. The pipes 11A and 11B are equipped with check valves 13A and 13B so as to prevent backflow of the main agent and the curing agent supplied to the pressure feeding stage S2 from the pressure feeding stage S2 to the supply stage S1. The main agent and curing agent are supplied and stored in a pail 10.

  The pressure feed stage S2 communicates with the mixing nozzle S3 via the hoses 16A and 16B, and temporarily stores the main agent and the curing agent supplied from the two-liquid supply stage S1 via the pipe 11 and the check valve 13, respectively. Cylinders 15A and 15B are provided. Pistons 17A and 17B are slidably fitted to the cylinders 15A and 15B, and actuators 19A and 19B are provided to slide the pistons 17A and 17B through the piston rods 18A and 18B, respectively. The actuators 19A and 19B can change the volumes in the cylinders 15A and 15B by sliding the pistons 17A and 17B according to the command of the mixed discharge controller C1, and the main liquid and the hardener are supplied in two liquids by expanding the volumes. The main agent and curing agent introduced by reducing the volume while being introduced from S1 are pumped to the mixing nozzle S3.

  The mixing nozzle S3 includes a manifold 20 that introduces the main agent and the curing agent supplied from the pressure feeding stage S2 via the hoses 16A and 16B, and a static mixer 21 that mixes the main agent and the curing agent introduced in a row to the manifold 20. The adhesive mixed by the static mixer 21 is applied by being discharged onto the workpiece from the tip of the mixing nozzle S3.

  Although not shown, the manifold 20 is provided with an opening / closing valve. The opening / closing valve is manually opened and closed when the mixing nozzle S3 including the manifold 20 and the static mixer 21 is manually operated as a hand gun. . A valve opening / closing signal and an adhesive discharge speed adjustment signal are transmitted to the mixed discharge controller C1, and the mixed discharge controller C1 controls the actuators 19A and 19B of the pressure feeding stage S2.

  In addition, as shown in FIG. 1, when the application operation is performed by holding the mixing nozzle S3 including the manifold 20 and the static mixer 21 by the application robot 25, the robot hand at the tip of the robot arm 26 is held by the application robot 25. The control valve C25 controls the opening and closing of the on-off valve, and an open / close signal and a discharge speed adjustment signal are transmitted from the controller C2 of the coating robot 26 to the mixed discharge controller C1, and the mixed discharge controller C1 controls the pumping stage S2. Actuators 19A and 19B are controlled.

  FIG. 3 shows an example of a workpiece to be bonded, which is a trunk lid provided with an outer panel W1 formed of a resin panel, an inner trim W2 formed of resin, and a reinforcement member W3 as a reinforcing member. In this example, the reinforcement member W3 and the inner trim W2 are joined by a mechanical fixing means such as a rivet, and the joining of the inner trim W2 with the adhesive B to the peripheral part of the outer panel W1 is adopted. . Thus, when joining the panel peripheral part of a trunk lid with the adhesive B, the adhesive bead of the adhesive which mixed the main ingredient and the hardening | curing agent was apply | coated to the peripheral part of the inner trim W2, and the adhesive bead hardened | cured In such a state, it is necessary to join the outer panel W <b> 1 so that the peripheral portion thereof is crimped with an adhesive bead interposed. The adhesive bead in which both panels W1 and W2 are joined is cured as it is by reaction with the curing agent, and reacts with moisture in the air in the portion where the curing agent is not included and only the main agent is applied. Cure gradually.

  The main agent and the curing agent for bonding the resin workpiece W are not limited to the following, for example, urethane polymer (31 Wt%), carbon black (40 Wt%), calcium carbonate (5 Wt%), A polyurethane sealant mixed with adipic acid plasticizer (15 Wt%) and phthalic acid plasticizer (7 Wt%) is used as the main agent, polyether polyol (32 Wt%), calcium carbonate (66 Wt%), amorphous dioxide Polyether polyol mixed with fine powder silica (2 Wt%) which is silicon can be used as a curing agent.

  The adhesive application operation by the two-component adhesive mixing application apparatus having the above configuration will be described below. In the application of the adhesive, first, the main agent and the curing agent are filled from the two-liquid supply stage S1 to the pressure feeding stage S2. The mixed discharge controller C1 outputs a command for sending the main agent and the curing agent in the pail cans 10A and 10B to the pumping stage S2 via the pipes 11A and 11B to the actuators 12A and 12B of the two-liquid supply stage S1. Then, a command to increase the coating cylinder volume by retreating the pistons 17A, 17B to the actuators 19A, 19B of the pressure feeding stage S2 is output. The main agent and the curing agent in the pail cans 10A and 10B are filled into the coating cylinders 15A and 15B via the pipes 11A and 11B and the check valves 13A and 13B. The operation of the actuators 12A, 12B, 19A, and 19B of the two-liquid supply stage S1 and the pressure-feeding stage S2 is stopped at the stage where the specified amounts of the main agent and the curing agent are filled in the coating cylinders 15A and 15B.

  In the above filling process, the coating robot 25 sets the mixing nozzle S3 to the standby position, positions and sets the workpiece W2 on the jig of the work stage by the workpiece handling robot 30, and waits to transport the workpiece W1 to be joined. Move to position.

  Next, the application robot 25 positions the mixing nozzle S3 at the adhesive application start position of the workpiece W2 set on the jig. The nozzle position signal of the coating robot 25 is output from the controller C2 to the mixing and discharging controller C1. When the adhesive application start command is output by the controller C2 of the application robot 25, the mixed discharge controller C1 outputs the main agent and curing agent discharge commands to the actuators 19A and 19B of the pressure feeding stage S2. The pistons 17A and 17B of the main agent and curing agent application cylinders 15A and 15B reduce the cylinder volume and send the main agent and curing agent to the mixing nozzle S3 via the hoses 16A and 16B. In the mixing nozzle S3, the main agent and the curing agent supplied via the hoses 16A and 16B are merged in the manifold 20, and both the agents are mixed by the static mixer 21 and discharged from the mixing nozzle S3. The application robot 25 moves the mixing nozzle S3 along a preset application line to form an adhesive bead on the workpiece W2 and apply the adhesive. The nozzle moving speed of the coating robot 25 is controlled by the controller C2, and the supply amount of the main agent and the curing agent supplied from the coating cylinders 15A, 15B to the mixing nozzle S3 by the actuators 19A, 19B of the pressure feed stage S2 by the mixing discharge controller C1. It is adjusted corresponding to.

  When the application of the adhesive by the application robot 25 is completed, the controller C2 outputs an application end signal to the mixing and discharging controller C1, and the mixing and discharging controller C1 stops the operation of the actuators 19A and 19B of the pressure feeding stage S2, and the mixing nozzle S3. Stop the discharge of adhesive from. The controller C2 retracts the mixing nozzle S3 gripped by the coating robot 25 to the standby position. Next, the workpiece handling robot 30 grips the workpiece W1 to be joined, positions the workpiece W2 to which the adhesive on the jig is applied, and presses both the workpieces W1 and W2. The adhesive bead in which both the workpieces W1 and W2 are bonded is cured as it is by reaction with the curing agent, and reacts with moisture in the air in a portion where the curing agent is not included and only the main agent is applied. Cure gradually. Next, the workpiece handling robot 30 carries out the bonded workpiece W, transports it to the next process, and ends the workpiece W bonding operation.

  Thereafter, similarly, a new workpiece W2 is positioned and set on the jig by the workpiece handling robot 30. The mixing nozzle S3 of the coating robot 25 is moved to the coating start position, a coating start command is output, the actuators 19A and 19B of the pressure feeding stage S2 are operated by the mixing and discharging controller C1, and the prescribed adhesive is discharged from the mixing nozzle S3. And apply the adhesive along the coating line. In this way, the work W can be sequentially bonded by repeating each process.

  In the coating process, the mixing / discharging controller C1 controls the actuators 19A and 19B of the pumping stage S2 with the control pattern shown in FIG. 4 as a method for pumping the main agent and the curing agent by the coating cylinders 15A and 15B. Although the main agent operates the actuator 19A continuously so that it is pumped to the mixing nozzle S3 at a constant discharge flow rate in the entire discharge region from the adhesive application start a to the application end d, the curing agent is applied from the adhesive application start a. Actuator 19B is operated so as to feed pressure to mixing nozzle S3 until time e before application end d. That is, from the time point e to the end of coating d, only the main agent is pumped to the mixing nozzle. The main agent pumped from this point e to the end of application d is introduced into the manifold 20 and the static mixer 21 of the mixing nozzle S3, and the mixed adhesion of the mixed main agent and curing agent in the manifold 20 and the static mixer 21 is exclusively performed. It functions to extrude the agent from the mixing nozzle S3. Therefore, at the time point d when the application of the adhesive is completed, the inside of the mixing nozzle S3 is filled with the main agent. In order to ensure that the mixed adhesive of the main agent and the curing agent mixed from the mixing nozzle S3 at the application end point d of the adhesive is surely discharged, the manifold 20 and the static mixer 21 from before the application end point d. However, it is effective to supply a slightly larger amount of the main agent so that the mixed adhesive of the main agent and the curing agent does not remain in the mixing nozzle S3. In this case, the time point e is set forward so that the preceding amount of the main agent supplied at the application end point d is slightly discharged from the mixing nozzle S3.

  On the other hand, as shown in FIG. 5, the obtained adhesive bead is first applied by discharging the main agent filled in the preceding application process in the manifold 20 and the static mixer 21 in the mixing nozzle S3 at the start of application a. Is done. That is, even if the main agent and the curing agent of the application cylinders 15A and 15B are simultaneously supplied to the mixing nozzle S3 at a predetermined ratio at the application start time point a, the mixture nozzle S3 is filled and discharged from the mixing nozzle S3. Only the main agent is. After the time point b at which the main agent filled in the mixing nozzle S3 is extruded and discharged and applied by the mixture of the main agent and the hardener supplied, the mixture of the main agent and the hardener is discharged and applied. Then, at the time point c immediately before the application end point d, the discharge and application of the mixture of the main agent and the curing agent are completed, and only the main agent is discharged and applied from the time point c to the end point d.

  The timing of stopping the supply of the curing agent at the time point e is that the application stroke of the mixing nozzle S3 is obtained from the volume of the manifold 20 and the static mixer 21 and the application amount per unit length. By setting the time point e to the application position before the application end position, the above operation can be automatically performed.

  In the present embodiment, the following effects can be achieved.

  (A) Two liquids provided with an application gun S3 that mixes the main agent supplied from the main agent supply means 15A to 19A and the hardener supplied from the hardener supply means 15B to 19B and applies them as an adhesive bead to the workpiece W to be bonded. In the mixed application method of the mold adhesive, the supply of the hardener from the hardener supply means is stopped before the end of the application by the application gun S3, and the main agent supply means 15A to 15A in the application gun S3 at the end of the application by the application gun S3. It was made to fill with the main agent supplied from 19A. For this reason, even if it is left for a long time after application, the adhesive does not solidify in the application gun S3, and waste of material due to purging the application gun S3 can be prevented.

  (A) At the start of application by the application gun S3, the main agent from the main agent supply means 15A to 19A and the hardener from the hardener supply means 15B to 19B are supplied to the application gun S3, and the application gun S3 is filled. The main agent is discharged from the application gun S3 as an adhesive bead and applied to the workpiece W, and then the main agent supplied from the main agent supply means 15A to 19A and the hardener supplied from the hardener supply means 15B to 19B are mixed. Since it is applied as an adhesive bead to the workpiece W to be bonded, the main agent filled in the coating gun S3 is also applied to the workpiece W, so that sufficient solidification characteristics can be obtained even with moisture, etc., and material loss occurs. Can be prevented. In addition, in the case of a work having a part suitable for a slower curing speed, optimum adhesion to the work can be achieved by starting application from that part.

  (C) The hardener supply stop timing from the hardener supply means 15B to 19B is set in a complicated manner by setting it as a parameter in advance from the internal volume of the application gun S3 and the application amount per unit length. The application pattern can be easily and reliably set.

  (D) By setting the supply stop timing of the hardener from the hardener supply means 15B to 19B so that only the main agent is applied from the application gun S3 to the workpiece W immediately before the end of application by the application gun S3, the hardener It is possible to reliably eliminate the residue of the mixed adhesive in the application gun S3, and more reliably prevent the adhesive from curing in the application gun S3.

(Second Embodiment)
FIG. 6 is a schematic cross-sectional view of a coating gun showing a second embodiment of a two-component adhesive mixed coating method to which the present invention is applied. In the present embodiment, the pressure feeding stage and the mixing nozzle are integrally formed to reduce the hose that communicates between them. The same devices as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  In FIG. 6, the two-component adhesive mixing and applying apparatus of the present embodiment has main agent and curing agent application cylinders 15A and 15B arranged in direct communication with the manifold 20 of the mixing nozzle S3. As in the first embodiment, pistons 17A and 17B are slidably inserted into the application cylinders 15A and 15B, and the sliding positions of the pistons 17A and 17B are moved by the actuators 19A and 19B via the piston rods 18A and 18B. The cylinder volume of the application cylinders 15A and 15B is variably controlled. The application cylinders 15A and 15B communicate with the two-liquid supply stage S1 via check valves 13A and 13B and a hose (not shown).

  As described above, the coating gun S4 in which the mixing nozzle S3 and the pressure feed stage S2 are integrated is large as a moving device. Therefore, the coating gun 25 is held by the coating robot 25 to perform coating work on the workpiece W. It is desirable to perform the coating operation by holding the moving track in advance, or by holding the moving track in advance. As in the first embodiment, the workpiece W is handled by the handling robot 30, the coating gun S4 is operated by the coating robot 25, and the actuators 12A of the pressure feed stage S2 and the two-liquid supply stage S1 are mixed by the mixing and discharging controller C1. By controlling 12B, 19A, and 19B, it is possible to apply the adhesive bead to the workpiece W and bond the workpiece W. In addition, the control pattern of the main agent and the curing agent in the coating process can be performed in the same manner as in the first embodiment.

  In the two-component adhesive mixing and coating apparatus having the above configuration, since the pressure feeding stage S2 and the mixing nozzle S3 are close to each other, the main agent is transferred from the pressure feeding stage S2 to the mixing nozzle S3 without causing pressure loss due to piping such as a hose. And the curing agent can be supplied, and the supply amount and mixing ratio of the main agent and the curing agent can be controlled with high accuracy.

  In the present embodiment, in addition to the effects (a) to (d) in the first embodiment, the following effects can be achieved.

  (E) A coating gun S3 that mixes the main agent supplied from the main agent supply means 15A to 19A and the curing agent supplied from the curing agent supply means 15B to 19B and applies them as an adhesive bead to the workpiece W to be bonded; In a two-component adhesive mixing and coating apparatus comprising: an application means 25 that moves the application gun S3 along the adhesive application line of the workpiece W while discharging the adhesive, and forms an adhesive bead on the workpiece W; Since the main agent supply means 15A to 19A and the hardener supply means 15B to 19B are held in the application means 25 and arranged in the vicinity of the application gun S3, the mixing nozzle S3 is fed from the pressure feed stage S2 without causing pressure loss due to piping such as a hose. The main agent and the curing agent can be supplied to the main body, and the supply amount and mixing ratio of the main agent and the curing agent can be controlled with high accuracy.

1 is a schematic configuration diagram of a two-component adhesive mixture coating apparatus showing an embodiment of the present invention. The circuit block diagram of the mixing application apparatus of a 2 liquid type adhesive agent similarly. Sectional drawing of the workpiece | work which shows an example of adhesion | attachment object. The characteristic view which shows the control pattern of the supply amount to the application | coating gun of a main ingredient and a hardening | curing agent. The top view of the adhesive bead of the application state by the control pattern of FIG. The schematic sectional drawing of the application | coating gun of the mixing application apparatus of the 2 liquid type adhesive agent which shows 2nd Embodiment of this invention.

Explanation of symbols

S1 Two liquid supply stage S2 Pressure feed stage S3 Mixing nozzle, coating gun S4 Coating gun W Workpiece 10A, 10B Pail can 11A, 11B Piping 12A, 12B, 19A, 19B Actuator 13A, 13B Check valve 15A, 15B Coating cylinder 20 Manifold 21 Static mixer 25 Coating robot, coating means 30 Handling robot

Claims (5)

In a mixed application method of a two-component adhesive comprising an application gun that mixes a main agent supplied from a main agent supply means and a hardener supplied from a hardener supply means and applies them to a work to be bonded as an adhesive bead.
The supply of the hardener from the hardener supply means is stopped before the end of application by the application gun, and the inside of the application gun is filled with the main agent supplied from the main agent supply means at the end of application by the application gun. A method of mixing and applying a two-component adhesive. At the start of application by the application gun, the main agent from the main agent supply means and the curing agent from the hardener supply means are supplied to the application gun, and the main agent filled in the application gun is discharged from the application gun as an adhesive bead. Apply to the workpiece,
The base agent supplied from the main agent supply means and the hardener supplied from the hardener supply means are then mixed and applied as an adhesive bead to the workpiece to be bonded. A mixed application method of a two-component adhesive.   3. The supply stop timing of the hardener from the hardener supply means is set in advance as a parameter from the content of the application gun and the amount of application per unit length. A mixed application method of a two-component adhesive.   4. The supply stop timing of the hardener from the hardener supply means is set so that only the main agent is applied from the application gun to the workpiece immediately before the end of application by the application gun. The mixed application method of the two-component adhesive according to any one of the above. The main gun supplied from the main agent supply means and the hardener supplied from the hardener supply means are mixed and applied as an adhesive bead to the work to be bonded, and the application gun is bonded to the work while discharging the adhesive from the application gun. A two-part adhesive mixing application device comprising: application means for moving along the agent application line to form an adhesive bead on the workpiece;
The two-component adhesive mixing and applying apparatus, wherein the main agent supplying means and the hardener supplying means are arranged in the vicinity of the applying gun while being held by the applying means.

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