JP7351683B2 - Discharge nozzle design method, discharge nozzle manufacturing method, and discharge nozzle - Google Patents

Description

The present invention relates to a method for designing a discharge nozzle, a method for manufacturing a discharge nozzle, and a discharge nozzle for applying a viscous material such as a sealer so as to form a bead having a triangular cross-sectional shape while discharging the material.

Traditionally, in the process of attaching the glass that makes up the front window (window glass) to the car body on an automobile manufacturing line, a viscous sealer (sealant) is used as an adhesive to bond the glass to the frame of the car body. things are being done. The sealer is automatically applied to the outer edge of the glass by, for example, a sealer application device including a robot or the like.

In the sealer application device, a sealer discharge nozzle is attached to the tip of the arm of the robot. Then, the discharge nozzle is moved by the operation of the robot, and the sealer discharged from the discharge nozzle is applied to the glass, forming a bead along the movement path of the discharge nozzle.

The bead formed on the glass in the sealer application process is triangular in order to maintain the sealer application width even when the sealer is compressed between the glass and the vehicle body. The cross-sectional shape is adopted. That is, the bead is formed to have a triangular cross-sectional shape with the side in contact with the glass as the bottom side and the upper side opposite to the bottom side as the apex side. By being crushed between the glass and the vehicle body, the bead maintains the bottom width of the triangular cross-sectional shape as the application width of the sealer, while creating a trapezoidal or square cross-sectional shape. It deforms and becomes an adhesive between the glass and the car body.

In order to form a bead with a triangular cross-sectional shape in this way, the sealer discharge nozzle is constructed by having a triangular notch at the lower end of the pipe-shaped peripheral wall with the opening end serving as the discharge port. There are some (for example, see Patent Document 1). According to the discharge nozzle having such a configuration, the discharge nozzle applies the sealer while moving with the notch facing the rear side in the direction of movement, and the transverse cross section follows the triangular shape of the notch. Triangular shaped beads are formed on the glass. In addition, Patent Document 1 discloses that in order to reliably apply sealer to the surface of a workpiece such as glass, the opening edge of the lower end opening of the application nozzle is inclined with respect to the vertical axis in a manner that follows the inclination of the surface of the workpiece. A configuration is disclosed.

Japanese Patent Application Publication No. 10-15456

Regarding the bead formed by the sealer applied by the discharge nozzle, the cross-sectional shape of the bead is Ideally, the notch of the discharge nozzle should correspond to a triangular shape. Conventionally, the cross-sectional shape of the bead was adjusted to an ideal (pure) triangular shape by adjusting the movement speed of the discharge nozzle by a robot, the discharge flow rate of the sealer, the clearance between the tip of the discharge nozzle and the glass surface, etc. In other words, the shape is approximated to a triangular shape along which the notch of the discharge nozzle follows.

It is true that the cross-sectional shape of the bead can be approximated to an ideal triangular shape to some extent by adjusting the moving speed of the discharge nozzle, etc. However, there is a limit to the method of making the cross-sectional shape of the bead closer to an ideal triangular shape by adjusting the moving speed of the discharge nozzle or the like.

For example, in order to shorten the time required to attach glass to a car body, the movement speed of the robot's discharge nozzle is increased, and in order to discharge a predetermined amount of sealer in a short period of time, the discharge flow rate (discharge rate per unit time) of the sealer is increased. ) need to be increased. When the discharge flow rate of the sealer increases, the discharge pressure of the sealer increases, and the sealer discharged from the discharge nozzle is pushed out of the nozzle by the discharge pressure, and is expanded and deformed to be released from the compressed state inside the nozzle. , the bead is formed so as to have a cross-sectional shape protruding from the opening shape of the notch of the discharge nozzle. In this case, the bead has, in its cross-sectional shape, a protruding portion that bulges out from the triangular shape along which the notch of the discharge nozzle follows.

The presence of an overhang in the bead with respect to the triangular cross-sectional shape interferes with the control of the bonding width and thickness of the bonded portion by the sealer, and causes a reduction in the quality of the finish of the bonded portion by the sealer. Furthermore, since the overhanging portion of the bead is essentially an extra portion, it is desirable that the overhanging portion be as small as possible from the viewpoint of reducing material costs. In particular, in order to shorten the time required for the glass installation process in order to improve productivity, it is necessary to increase the flow rate of sealer as the movement speed of the robot's discharge nozzle increases. The problem of the occurrence of overhanging parts becomes noticeable.

The present invention has been made in view of the above-mentioned problems, and provides a discharge nozzle design method that can improve the quality of the viscous material application area and reduce material costs. An object of the present invention is to provide a method for manufacturing a discharge nozzle, and a discharge nozzle.

The design method of a discharge nozzle according to the present invention has a cylindrical nozzle main body with one end opened as a discharge port for a viscous material, and a notch continuous with the discharge port is provided in a peripheral wall of an open end of the discharge port. 1. A method for designing a discharge nozzle having a notch, the discharge nozzle having a hypothetical notch that forms a pair of straight lines along a predetermined triangular shape when viewed from the front as a test nozzle, and under predetermined application conditions. , forming a test bead by discharging and applying a viscous material from the discharge port while moving the test nozzle; measuring the shape of the protruding portion from the triangular inclined side as a curved line connecting the vertices connected by the triangular inclined side; The method includes the step of determining the shape of the notch so that the shape inverted with respect to the sides is the front view shape of the notch.

In another aspect of the discharge nozzle design method according to the present invention, in the discharge nozzle design method, the curved line is a circular arc, and the front view shape of the notch is a curved line having an arc shape in a front view. The shape is determined by bulging inward.

The method for manufacturing a discharge nozzle according to the present invention includes a cylindrical nozzle main body portion having one end opened as a discharge port for a viscous material, and a notch continuous with the discharge port in a peripheral wall of an open end of the discharge port. A method for manufacturing a discharge nozzle having a predetermined coating condition, using as a test nozzle a discharge nozzle having a hypothetical notch that forms a pair of straight lines along a predetermined triangular shape when viewed from the front as the notch. , forming a test bead by discharging and applying a viscous material from the discharge port while moving the test nozzle; measuring the shape of the protruding portion from the triangular inclined side as a curved line connecting the vertices connected by the triangular inclined side; determining the shape of the notch so that the shape inverted with respect to the sides is the front view shape of the notch; and forming the notch based on the determined shape of the notch. It includes.

Another aspect of the method for manufacturing a discharge nozzle according to the present invention is that in the method for manufacturing a discharge nozzle, the curved line is a circular arc, and the front view shape of the notch is a curved line having an arc shape in a front view. The shape is determined by bulging inward.

The discharge nozzle according to the present invention has a cylindrical nozzle main body with one end opened as a discharge port for a viscous material, and has a notch continuous with the discharge port on the peripheral wall of the open end of the discharge port. In the discharge nozzle, the cutout is formed by a pair of inclined sides that follow a substantially triangular shape when viewed from the front, and the inclined sides have an arcuate shape with the inside of the cutout as a convex side as a whole. It is formed in such a way that

In another aspect of the discharge nozzle according to the present invention, in the discharge nozzle, the inclined side portion has, as the notch, a hypothetical notch that forms a pair of straight lines along a predetermined triangular shape when viewed from the front. The cross-sectional shape of the bead formed by discharging the viscous material from the discharge port using a bead having a curved shape based on the bulging shape of the protruding portion from the inclined side of the triangular shape along which the hypothetical notch follows. It is.

According to the present invention, it is possible to improve the quality of the part to which the viscous material is applied, and to reduce the material cost.

1 is a diagram showing the configuration of a sealer coating device according to an embodiment of the present invention. FIG. 3 is an explanatory diagram showing the positional relationship between a discharge nozzle and a window glass according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state in which a dam rubber is attached to a windshield according to an embodiment of the present invention. FIG. 3 is a perspective view showing a state in which beads are formed by a discharge nozzle according to an embodiment of the present invention. FIG. 2 is a front view of a nozzle main body of a discharge nozzle according to an embodiment of the present invention. FIG. 2 is a side view of a nozzle main body of a discharge nozzle according to an embodiment of the present invention. FIG. 2 is a plan view (cross-sectional view) of a nozzle main body of a discharge nozzle according to an embodiment of the present invention. FIG. 2 is a bottom view of a nozzle main body of a discharge nozzle according to an embodiment of the present invention. FIG. 3 is an explanatory diagram of a bead protrusion according to an embodiment of the present invention. FIG. 2 is a front view showing the tip of a discharge nozzle according to an embodiment of the present invention. FIG. 2 is a side view showing the tip of a discharge nozzle according to an embodiment of the present invention. This is a cross section taken along line AA in FIG. FIG. 2 is a flowchart showing an example of a procedure of a method of designing and a method of manufacturing a discharge nozzle according to an embodiment of the present invention. FIG. 2 is an explanatory diagram of a method of designing and a method of manufacturing a discharge nozzle according to an embodiment of the present invention. FIG. 3 is an explanatory diagram of a bead formed by a discharge nozzle according to an embodiment of the present invention.

The present invention provides a discharge nozzle for forming a bead having a triangular cross-sectional shape with a viscous material. The aim is to improve quality and reduce costs. Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, the viscous material applied by the discharge nozzle will be explained by taking as an example a sealer (sealing agent) used as an adhesive or the like.

As shown in FIG. 1, a discharge nozzle 10 according to the present embodiment is included in a sealer coating device 1 used in an automobile manufacturing line. The sealer application device 1 applies a sealer 3 as an adhesive to the windshield 2 in the process of attaching the windshield 2, which is a plate-shaped glass member forming a front window or the like, to the body of an automobile. That is, the sealer coating device 1 uses the window glass 2 as the workpiece to which the sealer 3 is applied.

Sealer 3 is a urethane adhesive. Specifically, the sealer 3 is, for example, a one-liquid room temperature, moisture-curing urethane adhesive that uses urethane as its main raw material. However, the viscous material may be any relatively high viscosity material (high viscosity fluid) that has enough viscosity to maintain its shape when applied to the workpiece. The viscous material may be, for example, an epoxy-based adhesive or a silicon-based adhesive, or may be an adhesive as well as another coating agent such as an adhesion auxiliary agent such as a primer.

The sealer application device 1 causes the robot 4 to move the discharge nozzle 10 along a predetermined path while discharging the sealer 3 from the discharge nozzle 10, thereby coating the outer edge of the windshield 2 along the movement path of the discharge nozzle 10. The sealer 3 is applied so as to form a bead 5. For example, the bead 5 is formed in an annular shape along the outer edge of the window glass 2. The window glass 2 coated with the sealer 3 is adhesively fixed to the frame portion of the vehicle body. The sealer application device 1 includes a robot 4 that moves a discharge nozzle 10 and a sealer supply section 6 that supplies a sealer 3 to the discharge nozzle 10.

The robot 4 functions as a moving means that holds the discharge nozzle 10 and moves the discharge nozzle 10 along a predetermined path. The robot 4 has a base part 4a installed on the floor and an arm 7 provided on the base part 4a, and is configured as a flexible robot arm (articulated robot) whose posture is controlled in various positions and angles. ing. The robot 4 is, for example, a six-axis robot having six joints. Note that the robot 4 is not limited to a floor-mounted robot as in this embodiment, but may be a ceiling-mounted robot, a wall-mounted robot, a shelf-mounted robot, or the like, for example.

A discharge nozzle 10 is attached to the robot 4 via a nozzle attachment portion 8 provided at the tip of an arm 7. The nozzle mounting portion 8 is a hollow portion that receives the sealer 3 and supports the discharge nozzle 10 with its internal space communicating with the inside of the discharge nozzle 10 . The robot 4 moves the discharge nozzle 10 in three-dimensional directions within its movable range.

In the example shown in FIG. 1, a window glass 2 as a workpiece is supported in a fixed state by a support device 9 with the application surface 2a side to which the sealer 3 is applied facing upward. The support device 9 includes a base 9a and a plurality of support columns 9b provided on the base 9a, and holds the window glass 2 in a predetermined posture by the plurality of support columns 9b. A suction portion 9c made of an elastic member such as rubber or sponge is provided at the upper end of the support column 9b, and the window glass 2 is fixed on the plurality of support columns 9b while being suctioned by the suction portion 9c. be done. With respect to the window glass 2 supported by the support device 9, the robot 4 moves the discharge nozzle 10 along the sealer 3 application surface 2a on the upper side of the window glass 2 with its discharge side facing downward.

The robot 4 is connected to a robot control panel and operates in response to control signals from the robot control panel. The robot control panel is a control unit for the robot 4, and causes the robot 4 to perform predetermined operations set by teaching. The operation of the robot 4 causes the discharge nozzle 10 to move along a predetermined application path of the sealer 3 on the window glass 2 .

The sealer supply section 6 includes a storage section such as a drum or a tank, and a drive source such as a pump, and supplies the sealer 3 in the storage section to the discharge nozzle 10 via the supply hose 11 by the drive source. The supply hose 11 has its midway portion supported by the arm 7 by a hose support portion 12 provided on the arm 7, and its downstream end portion is communicatively connected to the nozzle attachment portion 8. According to the sealer supply section 6, the sealer 3 in the storage section is supplied from the supply hose 11 to the discharge nozzle 10 via the nozzle attachment section 8 at a predetermined delivery pressure, and is discharged from the discharge nozzle 10 at a predetermined discharge flow rate. . Regarding the sealer supply unit 6, for example, during teaching of the robot 4, the delivery operation (for example, delivery timing, etc.) of the sealer 3 to the discharge nozzle 10 is set.

Regarding the configuration of the sealer application device 1 having the above configuration, the arrangement configuration of the robot 4, the configuration for supporting the window glass 2, and the configuration for supplying the sealer 3 to the discharge nozzle 10 are the same as in this embodiment. It is not limited to the configuration of the form.

The discharge nozzle 10 has a cylindrical nozzle main body 22 with one end opened as a discharge port 21 for the sealer 3, and has a notch 23 continuous with the discharge port 21 on the peripheral wall of the open end of the discharge port 21. (See Figures 2 and 4). In the discharge nozzle 10, in the longitudinal direction (the vertical direction in FIG. 5), the discharge port 21 side is referred to as the lower side, and the opposite side thereof is referred to as the upper side.

As shown in FIGS. 5 to 8, the nozzle main body 22 is a straight tubular portion with fixed outer and inner diameters and open ends, and its internal space serves as a flow path for the sealer 3. The nozzle main body 22 has a cylindrical inner peripheral surface 22a that forms a flow path for the sealer 3, and a cylindrical outer peripheral surface 22b that is concentric with the inner peripheral surface 22a in the cross section of the nozzle main body 22.

The discharge nozzle 10 has an opening at one end (lower side) of the nozzle body 22 as a discharge port 21 . Further, the nozzle main body 22 has a lower end surface 22 c, which serves as an opening end surface of the discharge port 21 and extends along a plane perpendicular to the central axis direction of the nozzle main body 22 . A cutout 23 is formed by cutting out a part of the peripheral wall forming the discharge port 21. Due to the notch 23, the lower end surface 22c of the nozzle main body 22 has a substantially "C" shape when the discharge nozzle 10 is viewed from the bottom.

The notch 23 has a substantially triangular shape in order to form the bead 5 having a triangular cross-sectional shape. That is, the notch 23 has a shape that widens toward the end, with the opening width gradually increasing from the upper side to the lower side. Specifically, the notch 23 has an inverted "V" shape that is symmetrical in the left-right direction, with the lower side being open, and has a shape that follows a substantially isosceles triangular shape. Therefore, the notch 23 has a pair of inclined sides 25. As shown in FIG. 5, a view directly facing the notch 23 is a front view of the discharge nozzle 10 (hereinafter referred to as "nozzle front view").

The other end (upper side) of the nozzle main body 22 is provided with a mounting portion for mounting the discharge nozzle 10 in a predetermined orientation with respect to the nozzle mounting portion 8 . This attachment portion forms a linear flow path for the sealer 3 together with the nozzle body 22, and opens a supply port that serves as an inlet for sealer into the discharge nozzle 10 upward.

The discharge nozzle 10 is formed as an integral member, for example, from a metal material such as brass or a resin material such as ABS resin or plastic.

As shown in FIGS. 1 to 3, on the coated surface 2a of the windshield 2, a string-shaped dam rubber 13 having a rectangular cross-sectional shape is provided in an annular manner on the inner circumferential side of an annular bead 5. It is being The dam rubber 13 is attached to the coating surface 2a with an adhesive tape 14.

Further, as shown in FIGS. 2 and 3, the outer edge of the window glass 2 is printed with black ceramic ink, for example, as an area including the area where the bead 5 is formed by the sealer 3 and the area where the dam rubber 13 is attached. A mask section 15 is provided. The mask portion 15 is a portion for preventing deterioration of the bead 5 due to ultraviolet rays of sunlight, and also serves as a decorative portion. A dam rubber 13 is provided on the inner edge side portion of the mask portion 15 via an adhesive tape 14, and a bead 5 is formed on the outer edge side portion of the mask portion 15. For example, a silane-based primer 16 is applied to the application area of the bead 5 on the mask portion 15 in order to improve the adhesion of the sealer 3 (see FIG. 2).

The window glass 2 is set on the support device 9 with the dam rubber 13 attached and the primer 16 applied. The sealer applicator 1 uses the robot 4 to place the discharge nozzle 10 on the window glass 2 set on the support device 9 in a substantially vertical state with the discharge port 21 side facing downward, and the notch 23 side of the discharge nozzle 10. It is moved along the outer circumferential side of the dam rubber 13 in a direction toward the rear in the traveling direction (see arrow A1).

In order to prevent the primer 16 from peeling off, the robot 4 coats the coating surface 2a so that a predetermined gap B1 is left between the coating surface 2a of the windshield 2 and the lower end (lower end surface 22c) of the discharge nozzle 10. The discharge nozzle 10 is moved parallel to the other (see FIG. 2). The size of the interval B1 is appropriately set depending on the diameter of the discharge nozzle 10, etc., and is not particularly limited. In this case, the size of the interval B1 is set to about 2 mm.

Regarding the application of the sealer 3, after the discharge nozzle 10 is set at a predetermined application start position on the application surface 2a of the windshield 2, the sealer 3 is force-fed to the discharge nozzle 10 by the sealer supply unit 6, and then Discharging of the sealer 3 from the discharge ports 21 of 10 is started. When the sealer 3 starts to be discharged, the robot 4 starts moving the discharge nozzle 10. As a result, the sealer 3 is ejected from the ejection port 21 in such a manner that it is pushed out from the notch 23 on the rear side while being pressed against the application surface 2a, and is parallel to the dam rubber 13 along the movement locus of the ejection nozzle 10. A bead 5 having a triangular cross-sectional shape is formed. Note that the bead 5 is formed, for example, so that its height above the application surface 2a is higher than the dam rubber 13.

The window glass 2 coated with the sealer 3 is adhesively fixed to the frame portion of the vehicle body within a predetermined time (for example, within several minutes) after the sealer 3 is coated, while maintaining the shape of the bead 5. Here, the bead 5 is pinched and crushed between the windshield 2 and the vehicle body, with the apex side of the triangular cross-sectional shape, that is, the ridgeline 5a side of the bead 5, being the adhesive surface of the frame portion of the vehicle body. . As a result, the bead 5 is deformed to have a rectangular cross-sectional shape while maintaining the width of the bottom side of the triangular cross-sectional shape as the application width of the sealer 3. Interposed between it and the vehicle body.

Furthermore, the dam rubber 13 prevents the sealer 3 from protruding beyond the mask portion 15 into the transparent glass portion. Note that the adhesive surface of the frame portion of the vehicle body is painted, and a urethane-based primer, for example, is appropriately applied to the adhesive area of the painted surface in order to improve the adhesion of the sealer 3. Furthermore, a string-like resin molding is attached between the frame portion of the vehicle body and the windshield 2 so as to surround the windshield 2.

In the process of applying the sealer 3 discharged from the discharge nozzle 10 to the windshield 2 attached to the vehicle body as described above, for example, in order to shorten the process time, it is necessary to control the movement speed of the discharge nozzle 10 by the robot 4. In order to speed up the process and discharge a predetermined amount of sealer 3 in a short time, it is necessary to increase the discharge flow rate of the sealer 3 (hereinafter referred to as "sealer discharge flow rate"). When the sealer discharge flow rate increases, the following phenomenon occurs.

That is, as the sealer discharge flow rate increases, the discharge pressure of the sealer 3 increases, and the sealer 3 discharged from the discharge nozzle 10 is pushed out of the nozzle by the discharge pressure and released from the compressed state within the nozzle. The bead 5 is expanded and deformed to form a cross-sectional shape protruding from the opening shape of the notch 23 of the discharge nozzle 10 . Specifically, it is as follows.

As shown in FIG. 9A, a discharge nozzle 10X having a notch 23X having a triangular shape is assumed as the discharge nozzle. The cutout portion 23X has an inclined side portion 25X that forms a straight line L1 when viewed from the front of the nozzle, and forms a symmetrical inverted “V” shape along an isosceles triangular shape due to the inclined side portions 25X. In other words, when the nozzle is viewed from the front, the triangular shape along which the notch 23X follows is an isosceles triangular shape whose equal sides are the straight line L1 along which the left and right inclined sides 25X follow, and whose base is the straight line along which the lower end surface 22c follows.

When the discharge nozzle 10X having the notch 23X as shown in FIG. 9(a) is used, due to the expansion and deformation of the sealer 3 as described above, the bead 5X crosses the In terms of surface shape, the discharge nozzle 10X has a protruding portion 5Xa that protrudes from the triangular shape along which the notch 23X extends. In FIG. 9(b), the overhanging portion 5Xa is shown as a colored portion.

As shown in FIG. 9(b), in a cross-sectional view of the bead 5X, the overhang 5Xa is formed by a notch shape imaginary line that corresponds to a straight line L1 formed by the left and right inclined sides 25X of the notch 23X when viewed from the front of the nozzle. This is a bulging portion protruding outward from L2. In other words, the projecting portion 5Xa is a flat semi-cylindrical portion surrounded by the notch shape imaginary line L2 and the outer surface 5Xb of the bead 5X, which is an outwardly convex curved surface, in a cross-sectional view of the bead 5X. be. Moreover, the bead 5X has a horizontal bottom surface 5Xc along the coating surface 2a as a contact surface with the coating surface 2a of the window glass 2.

In addition, in FIG. 9(b), the height position of the lower end surface 22c as seen from the front of the nozzle is made to coincide with the coating surface 2a of the windshield 2, and the straight line L1 formed by the inclined side portion 25X as seen from the front of the nozzle is defined as the virtual notch shape. A line L2 is shown by a two-dot chain line superimposed on the cross-sectional shape of the bead 5X. In other words, the shape of the notch 23X as viewed from the front of the nozzle is superimposed on the shape of the bead 5X in a cross-sectional view to represent the protruding portion of the notch 23X in the bead 5X from the shape of the nozzle as seen from the front.

Further, for example, when the lower end opening width D1 of the notch 23X of the discharge nozzle 10X is 8 mm and the height D2 of the notch 23X is 13 mm, the thickness E1 of the overhang 5Xa is approximately 0.5 mm. Here, the thickness E1 of the overhanging portion 5Xa is the maximum dimension of the overhanging portion 5Xa in a direction perpendicular to the notch shape imaginary line L2.

In this way, when the discharge nozzle 10X as shown in FIG. 9(a) is used, the cross-sectional shape of the bead 5X becomes a rounded triangle as a whole due to the overhang portion 5Xa. The presence of the overhanging portion 5Xa on the bead 5X hinders the control of the bonding width and thickness of the bonded portion by the sealer 3, and causes a decrease in the quality of the finish of the bonded portion by the sealer 3. Further, since the overhanging portion 5Xa of the bead 5X is originally an unnecessary portion, it is desirable that the overhanging portion 5Xa is as small as possible from the viewpoint of reducing material costs. In particular, in order to shorten the time required for the installation process of the windshield 2 in order to improve productivity, it is necessary to increase the sealer discharge flow rate as the movement speed of the discharge nozzle 10 by the robot 4 increases. As a result, the problem of the occurrence of the overhang 5Xa in the bead 5X becomes significant.

As described above, the bead 5 formed by the sealer 3 applied by the discharge nozzle 10 is easy to control the adhesive width and thickness when it is interposed between the windshield 2 and the vehicle body. From this point of view, it is ideal that the cross-sectional shape of the bead 5 corresponds to a triangular shape along which the notch 23X of the discharge nozzle 10X follows.

Therefore, in the discharge nozzle 10 according to the present embodiment, the shape of the notch 23 is devised. That is, in the discharge nozzle 10, the notch 23 is formed by a pair of inclined sides 25 that follow a substantially triangular shape when viewed from the front of the nozzle, and the inclined sides 25 as a whole make the inside of the notch 23 a convex side. It is formed in the shape of a circular arc.

As shown in FIGS. 10 to 12, the notch 23 is formed by a pair of notch end surfaces 27 forming each inclined side 25. As shown in FIGS. The cutout end face 27 is an end face obtained by cutting out the cylindrical peripheral wall of the nozzle body 22 into a substantially triangular shape. The pair of notch end surfaces 27 are formed symmetrically when viewed from the front of the nozzle, and form a substantially isosceles triangular shape with the lower end surface 22c as the base.

Specifically, as shown in FIGS. 8 and 10, the notch end surface 27 has a constant shape and size when the notch 23 is viewed from the front in the front-rear direction (left-right direction in FIG. 11) of the discharge nozzle 10. It is formed like this. In other words, the notch end surfaces 27 are parallel to the front-rear direction, and the pair of notch end surfaces 27 face each other in the left-right direction (see FIG. 8). In other words, the notch 23 is formed so that its front view shape (the shape of the nozzle when viewed from the front) is a projected shape with respect to the peripheral wall of the nozzle main body 22, and the projected portion is cut out.

Further, the opening width of the lower end of the notch portion 23 is made to match or substantially match the inner diameter of the nozzle body portion 22 . Therefore, in the bottom view shown in FIG. 8, the rear end of the notch end surface 27 passes through the center position C1 corresponding to the central axis of the nozzle body 22 in the front-back direction (left-right direction in FIG. 8). It is located at the same or substantially the same position as the straight line C2 (in the vertical direction).

In the notch 23 formed in this manner, the notch end face 27 has a width dimension in the front-rear direction that gradually increases from the upper side to the lower side, following the cylindrical shape of the peripheral wall of the nozzle body 22. In addition, it has a curved shape in side view (see FIG. 12). Further, by having the notch 23, the nozzle main body 22 has a front corner of the lower end in a side view, which has a rounded chamfered shape with respect to the right angle shape of the cylindrical shape of the peripheral wall (Fig. (see 11).

As described above, the pair of notch end surfaces 27 forming the notch 23 have a constant or substantially constant curvature as a whole when viewed from the front of the nozzle, and are curved in an arc shape with the inside of the notch 23 being the convex side. . In other words, the notch end surface 27 has a curved shape with a constant or substantially constant curvature from a lower end point 27a located on the lower end surface 22c to an upper end point 27b corresponding to the position of the apex of the notch 23 when the nozzle is viewed from the front. , has an inwardly bulging shape. When the nozzle is viewed from the front, the left and right notch end surfaces 27 have their upper end points 27b aligned with each other, forming a valley line 27c parallel to the front-rear direction (see FIG. 8).

In the discharge nozzle 10 of this embodiment, the notch end surface 27 forming the notch 23 has a curved shape of the outer surface 5Xb in the cross-sectional shape of the bead 5X as shown in FIG. 9(b) when viewed from the front of the nozzle. It has a transferred shape. That is, when the nozzle is viewed from the front, the notch end surface 27 has a shape obtained by inverting the curve representing the outer surface 5Xb in the cross-sectional shape of the bead 5X about the notch shape imaginary line L2. In other words, as shown in FIG. 10, when the nozzle is viewed from the front, the notch end surface 27 is symmetrical about the straight line M2 connecting the lower end point 27a and the upper end point 27b with respect to the curve M1 corresponding to the curve representing the outer surface 5Xb. It has the shape of

Therefore, the curved shape of the notch end surface 27 corresponds to the cross-sectional shape of the bead 5X formed using the discharge nozzle 10X having the inclined side 25X forming the straight line L1 when viewed from the front of the nozzle as shown in FIG. 9(a). Set based on That is, the inclined side part 25 of the notch part 23 is sealed from the discharge port 21 using the discharge nozzle 10X having a hypothetical notch part 23X forming a pair of straight lines L1 along a predetermined triangular shape as the notch part 23 when viewed from the front of the nozzle. Regarding the cross-sectional shape of the bead 5X formed by discharging No. 3, the bulging shape of the overhanging portion 5Xa is the protruding portion from the notch shape virtual line L2, which is the inclined side of the triangular shape along which the hypothetical notch 23X follows. It has a curved shape based on

In the notch 23 formed by the notch end surface 27 having such a shape, when the nozzle is viewed from the front, the opening width of the upper part gradually narrows from the bottom to the upper side, and the opening width of the lower part gradually narrows from the bottom to the upper side. The opening widens in a trumpet-like manner from the bottom to the bottom.

An example of a method of designing and a method of manufacturing the discharge nozzle 10 according to the present embodiment having the above shape will be described.

In the design method and manufacturing method of the discharge nozzle 10, as shown in FIG. 9(a), the discharge nozzle has an assumed notch 23X that forms a pair of straight lines L1 along a predetermined triangular shape when viewed from the front as the notch 23. 10X is used as the test nozzle 10Y. In the notch 23X of the test nozzle 10Y, the straight line L1 formed by the inclined side 25X when the nozzle is viewed from the front corresponds to the straight line M2 connecting the lower end point 27a and the upper end point 27b of the notch end surface 27, as shown in FIG. ing.

As shown in FIG. 13, first, a step of forming a test bead 5Y using the test nozzle 10Y is performed (S10). That is, as shown in FIG. 14(a), the test nozzle 10Y is used, and the test bead 5Y is coated by discharging the sealer 3 from the discharge port 21 while moving the test nozzle 10Y under predetermined coating conditions. is formed. The test bead 5Y is formed on a predetermined coating surface 2Ya similar to the coating surface 2a of the window glass 2 by using, for example, a test window glass. FIG. 14(a) is a front view showing how the test bead 5Y is formed by the test nozzle 10Y.

The test bead 5Y is a bead formed using the test nozzle 10Y, and has a form as shown in FIG. 9(b). That is, as shown in FIG. 14(b), the test bead 5Y is a bulging portion protruding outward from the notch shape virtual line L2, similar to the bead 5X shown in FIG. 9(b). It has a projecting portion 5Xa. FIG. 14(b) is a diagram showing the cross-sectional shape of the test bead 5Y, and shows the overhanging portion 5Xa as a colored portion.

The conditions for applying the sealer 3 in forming the test bead 5Y are the same as the conditions for applying the sealer 3 in forming the bead 5 on the window glass 2 using the discharge nozzle 10 according to the present embodiment. The coating conditions include the movement speed of the test nozzle 10Y by the robot 4 or the like and the sealer discharge flow rate. Further, in forming the test bead 5Y, the same sealer 3 as the sealer 3 applied to the window glass 2 using the discharge nozzle 10 is used. In addition, in forming the test bead 5Y, the sealer 3 application surface 2Ya is in the same state as the application surface 2a of the window glass 2 to which the sealer 3 is applied by the discharge nozzle 10, including the application state of the primer 16. .

Next, as shown in FIG. 13, a step of measuring the bulging shape of the protruding portion 5Xa in the test bead 5Y is performed (S20). In this step, the shape of the outer surface 5Xb is measured as the bulge shape of the overhang 5Xa of the test bead 5Y. That is, the shape of the notch 23X as viewed from the front of the nozzle is superimposed on the shape of the test bead 5Y in a cross-sectional view, and the shape of the protruding portion of the notch 23X in the test bead 5Y from the nozzle as seen from the front is measured.

Specifically, with respect to the cross-sectional shape of the test bead 5Y as shown in FIG. Measured as 30. As shown in FIG. 14(c), the curved line 30 is a curve connecting the vertices P1 and P2 connected by the notch shape virtual line L2, and connects the outer surface 5Xb of the overhanging portion 5Xa shown in FIG. 14(b). corresponds to the curve shown. The apex P1 is the lower end point of the notch shape imaginary line L2, the apex P2 is the upper end point of the notch shape imaginary line L2, and the positions of the apex P2 of the left and right notch shape imaginary lines L2 are mutually Match.

The measurement of the curved line 30 is performed, for example, by an appropriate method such as image processing based on a photographed image of the cross section of the test bead 5Y. The method of measuring the curved line 30 is not particularly limited as long as the shape of the curved line 30 can be obtained.

Subsequently, as shown in FIG. 13, a step of determining the shape of the notch 23 of the discharge nozzle 10 using the curved line 30 is performed (S30). That is, in this step, the shape of the curved line 30 obtained in step S20 is applied as the shape of the notch end face 27 forming the inclined side part 25 in the notch 23 when viewed from the front of the nozzle, and the shape of the notch 23 is determined. Ru.

Specifically, as shown in FIG. 14(d), the shape obtained by inverting the curved line 30 with respect to the notch shape virtual line L2 along which the hypothetical notch 23X follows is the front view shape of the notch 23. The shape of the notch 23 is determined so that That is, in a front view of the nozzle, the shape of the notch end surface 27 is symmetrical about the notch shape imaginary line L2 that connects the vertices P1 and P2 with respect to the curved line 30 that connects the vertices P1 and P2. . In determining the shape of the notch 23, the relationship between the dimensions of the notch 23X (23) and the test bead 5Y is a one-to-one correspondence.

Further, in the present embodiment, in the step (S30) of determining the shape of the notch 23, the curved line 30 is a circular arc, and the front view shape of the notch 23 is the curved line 30 that is arc-shaped when the nozzle is viewed from the front. It is determined that the shape is bulged inward. That is, as the curved line 30 that defines the shape of the notch end face 27 when the nozzle is viewed from the front, an arc shape having a constant curvature as a whole is adopted.

Specifically, as the curved line 30, for example, a partial shape of the circumference passing through the vertices P1 and P2 and the bulging-shaped apex P3 of the overhanging portion 5Xa is adopted (see FIG. 14(c)). . The arc-shaped curved line 30 becomes the shape of the notch end face 27, and the shape of the notch 23 is determined by the left and right notch end faces 27 with the convex side inside. Further, as a method of determining the curved line 30 as a circular arc shape, for example, a method of appropriately adopting a circular arc shape that approximates the bulging shape of the overhang portion 5Xa among the circular arc shapes passing through the two points P1 and P2. It may be.

The shape of the notch 23 designed by the design method including each of the steps described above is used, and in the method for manufacturing the discharge nozzle 10, a step of forming the notch 23 is performed. That is, as shown in FIG. 13, in the method of manufacturing the discharge nozzle 10, after steps S10 to S30 described above are performed, a step of forming the notch 23 is performed based on the determined shape of the notch 23. (S40).

The notch 23 is formed, for example, by projecting the front view shape of the notch 23 onto a cylindrical peripheral wall portion of the nozzle body 22 and cutting the projected portion. As a result, a notch 23 as shown in FIGS. 8, 10 to 12 is formed in the discharge nozzle 10.

The discharge nozzle 10 according to the present embodiment is manufactured through the steps described above. In addition, regarding the step (S30) of determining the shape of the notch 23 mentioned above, the shape of the curved line 30 is not limited to a circular arc shape. The curved line 30 may be, for example, a smooth curve with partially different curvatures.

According to the discharge nozzle 10 and its design method and manufacturing method according to the present embodiment as described above, it is possible to improve the quality of the sealer 3 application area and to reduce the material cost.

According to the discharge nozzle 10 according to this embodiment, as shown in FIG. The shape can be approximated to a straight triangle, and the generation of the overhang 5Xa can be suppressed. Specifically, it is as follows.

The sealer 3 discharged from the discharge nozzle 10 is pushed out of the nozzle by the discharge pressure, and is expanded and deformed to be released from the compressed state within the nozzle, and the sealer 3 is expanded and deformed relative to the opening shape of the notch 23 of the discharge nozzle 10. The bead 5 is formed to have a protruding cross-sectional shape. Here, the notch end surface 27 of the notch 23 scoops out the outward bulge of the bead 5 relative to the inclined side 5b relative to the inclined side 5b in a nozzle front view corresponding to the cross-sectional view of the bead 5. Since the sealer 3 has a concave shape in a similar manner, the bulging deformation of the sealer 3 discharged from the notch 23 is a deformation in a manner that fills the concave shape of the notch end surface 27 with respect to the straight line M2.

That is, the inwardly convex curved shape of the notch end surface 27 in the nozzle front view corresponds to the notch shape virtual line L2 corresponding to the straight line M2 connecting the lower end point 27a and the upper end point 27b in the cross-sectional shape of the bead 5X (5Y). This shape is an inversion of the curved line 30, which is a bulging shape from . Therefore, when the nozzle is viewed from the front, the shape and area of the inwardly protruding portion of the notch end surface 27 from the straight line M2 are as follows: It is approximated by Therefore, as the sealer 3 discharged from the notch 23 bulges and deforms, the inward bulge shape of the notch end face 27 is offset, and the inclined side 5b of the bead 5 approaches the straight line M2 and becomes linear. .

As a result, as shown in FIG. 15, the cross-sectional shape of the bead 5 is made into a shape extremely close to an isosceles triangular shape due to the bottom side 5c which is the contact surface with the application surface 2a and the left and right inclined sides 5b. I can do it. In addition, in FIG. 15, the height position of the lower end surface 22c when the nozzle is viewed from the front is matched with the coating surface 2a of the windshield 2, and the curve formed by the notch end surface 27 when the nozzle is viewed from the front is used as the notch shape imaginary line N2 to form the bead. It is shown by a two-dot chain line superimposed on the cross-sectional shape of No. 5.

As an example of the dimensional relationship between the discharge nozzle 10 and the bead 5, as shown in FIG. 10, the lower end opening width F1 of the notch 23, which corresponds to the inner diameter of the nozzle body 22, is 8 mm, and the height F2 of the notch 23 is 13 mm. Assume that the distance B1 between the discharge nozzle 10 and the coating surface 2a is 2 mm as shown in FIG. In this case, as shown in FIG. 15, for example, the width G1 of the bead 5 is approximately 8 mm, which is approximately the same as the lower end opening width F1 of the notch 23, and the height G2 of the bead 5 is approximately 8 mm. The height is approximately 12 mm, which is slightly smaller than the height F2. That is, the ratio of the width and height of the bead 5 shown in FIG. 15 is approximately 2:3. In the case of a bead 5 having such dimensions, by being crushed between the windshield 2 and the vehicle body, the bead 5 has a height of about 6 mm, for example, and a rectangular cross-sectional shape. transforms into

By making the cross-sectional shape of the bead 5 close to an ideal triangular shape, it becomes easier to control the adhesive width and thickness when the sealer 3 is interposed as an adhesive between the windshield 2 and the vehicle body. Thereby, problems such as protrusion of the sealer 3 can be improved, and the quality of the finish of the bonded portion by the sealer 3 can be improved. In addition, if a problem occurs such as the sealer 3 protruding, it will take time to correct the problem by wiping off the protruding part or reapplying. This can improve production efficiency.

Further, since the generation of the overhanging portion 5Xa in the bead 5 can be suppressed, the amount of the sealer 3 used can be reduced, and the material cost of the sealer 3 can be reduced. This makes it possible to obtain high effects in terms of cost. Regarding the reduction amount of the sealer 3, by using the discharge nozzle 10 according to this embodiment, for example, in comparison with the case where the discharge nozzle 10X as shown in FIG. The results have been obtained that the amount (volume) can be reduced to about 10%.

Furthermore, the occurrence of the protruding portion 5Xa in the bead 5 becomes more pronounced as the sealer discharge flow rate increases, but by adjusting the curved shape of the notch end surface 27 according to the large sealer discharge flow rate, a relatively large amount of sealer can be generated. It can also correspond to the discharge flow rate, and the cross-sectional shape of the bead 5 can be approximated to an ideal triangular shape. As a result, in order to improve productivity, it is possible to increase the sealer discharge flow rate as the movement speed of the discharge nozzle 10 by the robot 4 increases, and the time required for applying the sealer 3 to the window glass 2 can be shortened. I can do it. Regarding adjustment of the curved shape of the notch end surface 27, for example, if the curved shape of the notch end surface 27 in the front view of the nozzle is an arc shape, the higher the sealer discharge flow rate, the larger the curvature of the arc shape ( (to reduce the radius of curvature).

Furthermore, since the cross-sectional shape of the bead 5 can be approximated to an ideal triangular shape, the cross-sectional shape of the bead 5 when crushed and pinched between the windshield 2 and the vehicle body can be approximated to a quadrangular shape. can. Thereby, it becomes easy to secure the bonding area of the bonded portion by the sealer 3, and it is possible to improve the quality of the bonded portion.

Further, in this embodiment, an arc shape is adopted as the curved shape of the notch end face 27 of the notch 23 when the nozzle is viewed from the front. Thereby, the curved shape of the notch end surface 27 can be made into a simple shape, so that the shape of the notch end surface 27 can be easily determined. As a result, the discharge nozzle 10 can be manufactured easily.

According to the discharge nozzle 10 according to the present embodiment, the notch end face 27 forming the inclined side portion 25 of the notch 23 has an arc shape as a whole with the inside of the notch 23 on the convex side when viewed from the front of the nozzle. It is formed like this. According to such a configuration, the simple notch shape can suppress the generation of the overhanging portion 5Xa in the bead 5, and the cross-sectional shape of the bead 5 can be approximated to a triangular shape. Thereby, as described above, it is possible to improve the quality of the area to which the sealer 3 is applied and to reduce material costs.

As described above, in the discharge nozzle 10 according to the present embodiment and its design method and manufacturing method, the sealer 3 discharged from the notch 23 expands and deforms, so that the notch 23 does not form in the cross-sectional shape of the bead 5. Focusing on the fact that an overhang 5Xa protrudes from the cutout shape, the shape of the cutout 23 is devised in anticipation of the occurrence of the overhang 5Xa. That is, by anticipating the shape of the bulging portion of the bead 5 and subtracting the shape of the bulging portion from the notch shape of the notch 23 (making it protrude inward), a so-called bulging margin is created in the bead 5, and the bulge is reduced. This is intended to suppress the formation of an overhanging portion 5Xa in the deformed bead 5, and to bring the final cross-sectional shape of the bead 5 close to an ideal triangular shape.

The discharge nozzle and the design method and manufacturing method thereof according to the present invention described using the embodiments as described above are not limited to the above-mentioned embodiments, and various aspects may be adopted within the scope of the spirit of the present invention. be able to.

In the embodiment described above, the workpiece to which the sealer 3 is applied by the discharge nozzle 10 is the window glass 2, but the object to which the viscous material is applied according to the present invention is not limited to the window glass 2, but can be applied to other workpieces. It may be an automobile part or a part other than an automobile part.

1 Sealer application device 2 Windshield 3 Sealer (viscous material)
5 Bead 5a Ridgeline 5c Base 5Y Test bead 5b Inclined side 5Xa Overhang 5Xb Outer surface 10 Discharge nozzle 10Y Test nozzle 21 Discharge port 22 Nozzle main body 23 Notch 23X Notch 25 Inclined side 25X Inclined side 27 Notch end face 27a Lower end point 27b Upper end point 30 Curved line

Claims (6)

A method of designing a discharge nozzle having a cylindrical nozzle main body with one end opened as a discharge port for a viscous material, and having a notch continuous with the discharge port in a peripheral wall of the open end of the discharge port, ,
A discharge nozzle having hypothetical notches forming a pair of straight lines along a predetermined triangular shape when viewed from the front is used as a test nozzle, and under predetermined coating conditions, while moving the test nozzle, from the discharge port forming a test bead by dispensing and applying a viscous material;
Regarding the cross-sectional shape of the test bead, measuring the shape of a protruding portion from the triangular inclined side along which the hypothetical notch extends as a curved line connecting the vertices connected by the triangular inclined sides. and,
determining the shape of the notch so that the front view shape of the notch is a shape obtained by inverting the curved line with respect to the inclined side of the triangular shape along which the hypothetical notch follows; A method for designing a discharge nozzle, comprising: The curved line is a circular arc,
2. The method of designing a discharge nozzle according to claim 1, wherein the shape of the notch when viewed from the front is determined as a curved line that is arcuate when viewed from the front and bulges inward. A method for manufacturing a discharge nozzle, which has a cylindrical nozzle main body with one end opened as a discharge port for a viscous material, and has a notch continuous with the discharge port in a peripheral wall of the open end of the discharge port, ,
A discharge nozzle having hypothetical notches forming a pair of straight lines along a predetermined triangular shape when viewed from the front is used as a test nozzle, and under predetermined coating conditions, while moving the test nozzle, from the discharge port forming a test bead by dispensing and applying a viscous material;
Regarding the cross-sectional shape of the test bead, measuring the shape of a protruding portion from the triangular inclined side along which the hypothetical notch extends as a curved line connecting the vertices connected by the triangular inclined sides. and,
determining the shape of the notch so that the front view shape of the notch is a shape obtained by inverting the curved line with respect to the inclined side of the triangular shape along which the hypothetical notch follows;
A method of manufacturing a discharge nozzle, comprising: forming the notch based on the determined shape of the notch. The curved line is a circular arc,
4. The method of manufacturing a discharge nozzle according to claim 3, wherein the shape of the notch when viewed from the front is determined as a curved line that is arcuate when viewed from the front and bulges inward. A discharge nozzle having a cylindrical nozzle main body with one end opened as a discharge port for a viscous material, and having a notch continuous with the discharge port on a peripheral wall of the open end of the discharge port,
The cutout is formed by a pair of inclined sides that follow a substantially triangular shape when viewed from the front, and the inclined sides have a curved shape with the inner side of the cutout as a convex side as a whole.
A discharge nozzle characterized by: The discharge nozzle according to claim 5, wherein the inclined side portion is formed in an arc shape with the inside of the notch as a convex side as a whole .

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