JP3367978B2 - Joining structure of molding terminal at corner and method therefor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal joining technique for a synthetic resin molding, and more particularly to a joining structure for a molding terminal at a corner and a joining method thereof.

[0002]

2. Description of the Related Art In order to mount a window glass on a vehicle body and to conceal a gap between the window glasses, a wind molding made of a long extrusion molded product mainly composed of a synthetic resin such as vinyl chloride is used. When mounting this kind of wind molding on, for example, a rear window of an automobile, an upper portion formed of a substantially straight line portion forming an upper portion of the window frame and a substantially wide U-shaped portion forming both side portions and a lower portion of the window frame are used. And the ends of the upper part and the side lower part are integrally heat-bonded together at the upper corners of the window frame.

By the way, in this type of wind molding, as shown in FIG. 1 of the accompanying drawings, the main body of the molding 10 has a wind glass insertion groove 11 inside, and the outside of the upper part is relatively soft and in contact with the vehicle body. An umbrella-shaped lip portion 12 made of the above material is often formed.

Then, when the moldings M1 and M2 having such a cross-sectional shape are cut at a predetermined angle and are joined to each other and the cut surfaces are integrally heat-bonded, the joint portion is a corner portion C.
Since the joining angle is tight, the lip portion 12 is
Since the width W1 is larger than the width W of the general portion W, it tends to interfere with the vehicle body surface when mounted. Therefore, the lip portion 12 located on the upper outer side of the molding body 10
The tip side of the floats up due to the reaction force, which is not only unsightly in appearance but also cannot sufficiently contact with the vehicle body, so that it cannot function as a molding.

In addition, in order to make the width of the lip portion 12 uniform, the joined corner portion C is often subjected to a curved cut (d-d) inside its outer edge, if necessary.
As shown in FIG. 1, since the lip portion 12 has a predetermined curved surface, the lip end portion is above the predetermined position due to the cut, and in such a case, the above-mentioned design and functional The problem becomes more serious.

Therefore, in order to suppress the lifting of the lip portion 12 at the corner portion C, it is proposed that the vicinity of the joint portion be heated and the lip portion 12 be tilted downward in a post process after joining. However, once the thermal bonding of the molding terminal is performed, the thermal deformation again causes not only peeling of the bonding surface and unevenness of the deformation amount but also the thermal deformation is performed at a temperature lower than the plastic deformation temperature of the resin. It may be easily restored due to the heat history during use.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above problems, and when a synthetic resin molding having an umbrella-shaped lip portion on the upper outer side is joined at a corner portion, the lip portion is formed. It is an object of the present invention to provide a novel terminal joining structure and method for molding, which can be mounted beautifully without rising from the vehicle body surface.

[0008]

SUMMARY OF THE INVENTION That is, the invention presented herein is one in which a molding terminal having an umbrella-shaped lip portion on the upper outer side is joined at a corner portion, and an umbrella near the joining end portion of the molding is provided. The joining structure of the molding terminal at the corner is characterized in that the curved lip portion is bent downward and is integrally welded to the other general portion.

Further, as a method of effectively realizing the above structure, when joining a molding terminal having an umbrella-shaped lip portion on the upper outer side at a corner portion, another umbrella-shaped lip portion near the end to be joined of the molding is used. Of the molding member is bent to be held below the general part of the molding, and the joined end surfaces of the moldings are heated and melted, and then the joined end surfaces of the moldings in a molten state are joined together. A method for joining a molding terminal in a corner portion is proposed, in which the outer periphery of the joining portion is regulated by a predetermined mold blade and integrally welded.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. 1 is a perspective view of an essential part seen from the inside showing a terminal joining structure of the synthetic resin molding of the present invention, FIG. 2 is a perspective view of the essential part also seen from the outside, and FIG. 4 is an end view taken along line 4-4 of FIG. 2, and FIG. 5 is a sectional view taken along line 5-5 of FIG.

8 to 13 show an example of the method of the present invention. FIG. 8 is a schematic plan view showing an example of a terminal joining apparatus for carrying out the method of the present invention in alphabetical order together with the operation, and FIG. 9 is the terminal. FIG. 11 is a front view of the molding holding die of the joining device as viewed from the joining surface side, and FIG. 10 is a front view showing the mold opening state of the molding holding die.
12 is a perspective view of a lower mold member of a molding holding type, FIG. 12 is a plan view of the holding mold showing a heated and melted state of a joined end of the molding, and FIG. 13 is a sectional view taken along line 13-13 of FIG.

As shown in FIGS. 1 to 5, the joining structure of the molding according to the present invention is such that the ends of the moldings M1 and M2 having the umbrella-shaped lip portion 12 on the upper outside are joined at the corner portion C. At
The tip portion 13 of the lip portion 12 is bent downward and is integrally welded to the other general portion.

As will be understood from FIG. 2 and the sectional views of FIG. 4 and FIG. 5, the bending of the lip portion 12 is such that it is bent most at the joint portion J of the moldings M1 and M2. Gradually collapse in the vicinity of the joined end portions of M1 and M2. Reference numeral 14 represents the gradually changing portion of the collapse. As shown in FIG. 4, the bending amount a is about 7 mm in the molding 10 in which the width of the lip portion 12 is about 7 mm.

Thus, the moldings M1 and M
In the case where the tip 13 of the lip portion 12 of the joined end portion of No. 2 is bent downward by welding, as shown in FIG. 2, the distance (radius) from the base portion of the lip portion 12 is small. Moreover, the outer circumference of the lip portion 12 becomes shorter. Further, as shown in FIG. 5, a thin resin solidification line L that is solidified by being melted by the heat at the time of welding appears on the front surface side and the back surface side of the lip portion 12 along the joint portion J of the moldings M1 and M2. It The resin solidification lines L formed on the front surface side and the back surface side of the lip portion 12 maintain the bent posture of the lip portion 12. It has strong durability against heat history and the passage of time after joining.

The terminal joining structure of the molding described above can be obtained by the following method. That is, the terminal joining method of this molding consists of a heating and melting step of the end faces to be joined of the molding and its welding step,
It is realized by a molding terminal joining device 20 as shown in FIG.

First, the outline of the molding terminal joining device of this embodiment will be described.
0 is a pair of molding holding dies 20A for holding the moldings M1 and M2 and joining their joined end faces.
With 20B. This molding holding type 20A, 2
As shown in FIG. 8, 0B are arranged so that they can be attached to or separated from each other at a predetermined angle depending on the joining angle of the moldings M1 and M2.

Here, the molding holding mold 20A, 2
The structure of OB will be described with reference to FIGS. 9 to 11 of the accompanying drawings. Each holding mold 20A, 20B is divided into appropriate mold members so as to be opened and closed so that the molding can be held and released. ing. In this embodiment, the lower die member 23 fixed to the bases 21A and 21B is used.
A, 23B and springs 39A, 39 on the lower mold member.
Lateral mold members 24A, 24 elastically connected by B
B and upper mold members 25A and 25B.

The lower mold members 23A and 23B, the lateral mold members 24A and 24B, and the upper mold members 25A and 25B are shown in FIG.
When the mold is closed, each molding M
Molding holding portion 26 forming the outer shape of 1, M2
It goes without saying that it has A and 26B.

As can be seen from the perspective view of FIG. 11, the joining surface sides of the molding holding portions 26A and 26B of the lower mold members 23A and 23B are umbrella-shaped lips of the joined ends of the moldings M1 and M2. The protruding shape 26E is formed so that the portion is on the molding lower side than the other general portions. In the figure, reference numeral 26C indicates a general portion, and 26D indicates a gradually changing portion.

The lower mold members 23A and 23B have rails 22A and 22B on the bases 21A and 21B as shown in FIG. 9, and can be reciprocated in the directions toward and away from each other by the cylinder devices 40A and 40B shown in FIG. Is configured.

As shown in FIG. 10, the lateral mold members 24A and 24B are openably and closably connected to the lower mold members 23A and 23B through springs 39A and 39B. In addition, the upper mold members 25A and 25B are the cylinder device 4
It is opened and closed by 1A and 41B. Reference numeral 42A in FIG.
A cylinder device 42B opens and closes the upper plate members 43A and 43B.

This molding holding type 20A, 20B
On the mating surface side of, as better understood from FIG. 9,
Forming blades 30A and 30B that define the outer peripheral design surface shape at the joint of the molding are formed. The mold blades 30A and 30B are, as described later with reference to FIG.
When the molding holding dies 20A and 20B are joined together, the molding holding dies 20A and 20B are brought into contact with each other, and the outer peripheral (designed surface) shape of the molding joining portion is regulated to a predetermined molding shape while being pressure-bonded, and the molding holding dies 20A and 30B are protruded to the outside. The protruding portion is cut off.

The die blades 30A and 30B are preferably provided with a clearance as small as possible in order to bond the design surfaces of the molding beautifully. In this embodiment, the clearance is set to 0 mm. As a result, the protruding portion of the molding is sharply cut, so that the seams of the moldings to be joined are inconspicuous and the appearance of the design surface can be improved.

At this time, the mold blade 30 is subject to impacts during joining.
In order to prevent the A and 30B from being damaged, protective protrusions 31A and 31B projecting slightly from the mold blade 36 (0.02 mm in the embodiment) on the joining surface of the molding holding dies 20A and 20B. Has been done. Note that reference numeral 32A,
32B is a relief recess of the protruding portion of the molding that is cut by the mold blade 36.

Referring back to FIG. 8, the method of the present invention will be described in the order of steps. As shown in FIG. 8A, the moldings M1 and M2 to be joined to the molding holding dies 20A and 20B opened are inserted. At this time, each of the molding holding molds 20A, 20B has a cylinder device 40A, 40B.
B is moving backwards. In the moldings M1 and M2 in the process of FIG. 1A, the end faces to be joined have a predetermined joining angle, in this example, about 80 to 1
It is cut diagonally at an angle of 70 degrees.

Then, as shown in FIG. 1B, the molding holding molds 20A, 20B are connected to the cylinder devices 40A, 4B.
By 0B, the mold is advanced to the position of the predetermined stopper 50, and the moldings M1 and M2 are inserted to the predetermined position and the mold is closed.

Thereafter, as shown in FIG. 1 (C),
The stopper 50 is retracted, and a heat source such as a heater 60 is forwardly arranged to replace the stopper 50. The molding holding molds 20A, 20B are advanced with respect to the heater 60 to move the joined end surfaces m1, m2 of the moldings M1, M2. Contact the heater 60.

Joined end faces m1 and m of this molding
No. 2 is melted by being heated for a suitable time by a timer or the like (not shown) provided in the heater 60. In addition, the heater is a melting temperature of the molding, in the embodiment,
It is adjusted to 250 to 290 ° C. The amount of fusion of the end faces m1 and m2 to be joined of the molding is appropriately determined depending on the material and thickness of the joined molding, and in this embodiment, it is about 1.0 to 1.5 mm from the end face. The heated and melted state of the end faces to be joined of the moldings M1 and M2 is shown in the sectional view of FIG. Further, FIG. 7 is a perspective view of the moldings M1 and M2 showing the end faces mm1 and mm2 to be joined which are heated and melted.

It is also possible to melt the joined end surfaces of the moldings M1 and M2 without directly contacting them with a heat source such as the heater. In this case, thermal deformation of the terminal of the molding can be suppressed as much as possible, and the appearance of the product can be further improved. In that case, the temperature of the heat source 80 is set to 600 to 800 degrees.

Next, in the welding step of FIG. 1 (D), the melted end faces to be joined are brought into contact with each other, and they are pressure-bonded to each other for joining. That is, when the heater 60 retracts out of the mold when the joined end surfaces of the moldings M1 and M2 are melted by a predetermined amount in the heating and melting step, the molding holding molds 20A and 20B are moved forward and joined by the cylinder devices 40A and 40B. , Each molding holding type 20A,
The molten end faces of the moldings M1 and M2 held by 20B are pressure bonded.

As can be better understood from FIGS. 12 and 13, the portion M0 protruding from the predetermined outer peripheral shape of the molding by the pressure bonding of the moldings M1 and M2 is the mold blade 3 provided on the molding holding molds 20A and 20B.
They are joined while being regulated by 0A and 30B.

Particularly, as described above, for example, FIG.
The mold blades 30A and 30B on the joining surface, which is the design surface side of the moding shown on the lower side, have a clearance of 0 mm at the time of joining, so the protruding portion MO of the molding joining portion is sharply cut. As a result, the seams of the moldings to be joined are inconspicuous, and the appearance of the design surface can be treated beautifully. The clearance when the mold blades 31A and 31B on the joining surface on the non-designed surface side of the moding shown in the upper side of FIG. 13 are joined together is set to 0.2 mm.

As described above, at the joint portion J of the moldings M1 and M2, as described above, the mold blades 30A and 30B are formed.
Since the outer peripheral shape is regulated by the above, the molding can be integrally welded with almost no appearance of the molding body. At the same time, due to the regulation of the outer peripheral shape by the die blades 30A and 30B, the thin resin solidification line L described above is formed along the joining portion J.

After the joining process is completed, the molding holding dies 20A, 20B are retracted by the cylinder devices 40A, 40B, the respective die members are opened, and the integrally joined moldings are taken out.

[0035]

As shown and described above, according to the structure of the present invention, the umbrella-shaped lip portion in the vicinity of the joining end portion of the molding is bent downward and is integrally welded to other general portions. Therefore, the peripheral length of the corner portion is shorter than in the conventional case, and the lip portion of the corner portion can be mounted beautifully without rising from the vehicle body surface.

Further, according to the molding terminal joining method of the present invention, not only the molding terminals at the corners can be joined simply and reliably, but also the design surface of the joining portion can be beautifully treated. Furthermore, since the outer periphery of the molding is welded while being regulated by a predetermined mold blade, it has a simple mold structure, which not only greatly reduces the labor of work but also its adhesive strength is high and products such as peeling and deformation The occurrence of defects can be suppressed.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of the synthetic resin molding according to the present invention, showing a terminal joining structure as seen from the inside.

FIG. 2 is a perspective view of a main part of the same seen from the outside.

FIG. 3 is a view on arrow 3 in FIG.

FIG. 4 is an end view taken along line 4-4 of FIG.

5 is a sectional view taken along line 5-5 of FIG.

FIG. 6 is a perspective view of a main part showing a conventional terminal joining structure of a synthetic resin molding.

FIG. 7 is a view on arrow 7 in FIG.

FIG. 8 is a schematic plan view showing an example of the terminal joining device for carrying out the method of the present invention in alphabetical order together with the operation.

FIG. 9 is a front view of the molding holding die of the terminal joining device as seen from the joining surface side.

FIG. 10 is a front view showing a mold open state of the molding holding mold.

FIG. 11 is a perspective view of a molding holding lower member.

FIG. 12 is a plan view of a holding mold showing a heated and melted state of a joined end of a molding.

13 is a sectional view taken along the line 13-13 in FIG.

[Explanation of symbols]

20 Molding terminal joining device 20A molding holding type 20B molding holding type 30A type blade 30B type blade 60 heater M1 molding M2 molding C corner section J joint part

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-56-42621 (JP, A) JP-A-6-15746 (JP, A) Actual development Sho-53-133880 (JP, U) JP-B-46- 9676 (JP, B1) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29C 65/00-65/82 B29D 31/00 B60J 1/02 111

Claims (2)

(57) [Claims] 1. A molding terminal having an umbrella-shaped lip portion on an upper outer side joined at a corner portion, and the umbrella-shaped lip portion near the joining end portion of the molding is bent downward from other general portions. The joining structure of the molding terminals at the corners is characterized by being welded together. 2. When joining a molding terminal having an umbrella-shaped lip portion on the upper outer side at a corner portion, the umbrella-shaped lip portion in the vicinity of the end to be joined of the molding is positioned lower than other general portions. The molded end is bent and held by a mold member, the end faces to be joined of the moldings are heated and melted, and then the end faces to be joined in a molten state of the moldings are joined together, and the outer periphery of the joined portion is formed into a predetermined die. A method for joining a molding terminal at a corner, characterized in that the welding is performed integrally while being regulated by a blade.