JPH06182879A - Removing method for extended part of end connecting part of molding - Google Patents

Abstract

PURPOSE:To provide a method for effectively and reliably removing an extended part in a recess in a method for thermally connecting by holding an end of molding having a recess at a holding die having a die cutter. CONSTITUTION:An extended part generated at a thermally connected part of a recess of molding is removed by holding it by recess side die members 25A, 25B independent from body side die members 22A, 22B for holding other body part of a connecting end holding die of the molding and separating the recess side die members before the body side die members after thermally connecting.

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 synthetic resin moldings, and more particularly to a method for removing a humped portion at a terminal joining portion.

[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 this kind of wind molding is mounted 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 end portions of the upper and side lower portions are integrally heat-bonded and attached.

By the way, in this type of wind molding, as shown in FIG. 7 or FIG. 8 of the accompanying drawings, there is a window glass insertion groove G which is a concave portion inside. Moldings M1 and M2 having such recesses
When the terminals are heat-bonded to each other, if the portion S of the melted white that is melted by the heat and squeezes out to the joint J and remains in the glass insertion groove G, the removal work is extremely complicated and takes time. However, it is impossible to completely take out the deep portion, which may cause a problem in mounting glass.

The inventors of the present invention have previously carried out heat bonding of this type of wind molding by holding the two molding terminal portions respectively in a holding die having a mold blade to thermally bond both terminals together, It was proposed to cut the protruding part with a die blade.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a thermal bonding method in which a holding die having such a mold blade is held by holding a terminal portion of a molding having a concave portion, and an effective portion of the groove is formed in the concave portion. It is intended to propose a method of sure removal.

That is, in the invention presented here, when two moldings having a recess are respectively held in a holding die having a mold blade and both ends are thermally bonded together, the portion of the molding including the recess is By holding by a recess side mold member independent of the main body side mold member that holds the other main body part of the holding mold, and by separating the recess side mold member prior to the main body side mold member after thermal bonding The present invention relates to a method for removing a humped portion at a terminal joint portion of a molding, characterized in that a humped portion generated at a thermal joint portion of the recess of the molding is removed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 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, and FIG. 2 is a front view of the molding holding die of the terminal joining device as seen from the joining surface side, FIG. Is a front view showing the mold-opening state of the molding holding die, FIG. 4 is a plan view of the holding die showing a heated and melted state of a joined end of the molding, and FIG. 5 is a sectional view taken along line 5-5 in FIG. FIG. 6 is a front view of a state in which the concave-side mold member of the holding mold is separated prior to the main-body-side mold member after thermal bonding.

First, the outline of a molding terminal joining device of the embodiment will be described with reference to FIG. 1. This terminal joining device 20 holds a pair of molding holding molds 20A for holding the moldings M1 and M2 and joining their joined end faces. , 20B. As shown in the figure, the molding holding molds 20A, 20B have moldings M1,
They are arranged so that they can be attached or separated from each other at a predetermined angle depending on the joining angle of M2.

Here, the molding holding mold 20A, 2
The structure of OB will be described with reference to FIGS. 2 and 3 of the accompanying drawings. Each holding mold 20A, 20B is capable of holding and removing the molding, and is capable of removing the protruding portion in the recess. Suitable mold member,
In particular, it is divided into main body side mold members 22A and 22B, which are portions that hold the main body side of the molding, and recess side mold members 25A and 25B, which are portions that hold the concave side of the molding, and are configured to be openable and closable.

In this embodiment, the main body side mold member 22
A and 22B are lower die members 23A and 23B fixed to the bases 21A and 21B, and a spring 3 is attached to the lower die members.
Upper mold member 2 elastically connected by 9A and 39B
4A and 24B.

The body side mold members 22A and 22B (that is, the lower mold members 23A and 23B and the upper mold member 24).
A, 24B), and the recess side mold members 25A, 25B,
Needless to say, as shown in FIG. 2, when the mold is closed, it has molding holding portions 26A and 26B that form the outer shape of the moldings M1 and M2.

Lower mold members 23A, 23B of the main mold member
Rails RA, R on the bases 21A, 21B as shown in the figure.
B, and is reciprocally movable in the directions toward and away from each other by the cylinder devices 40A and 40B of FIG.

Upper mold members 24A, 24B of the main mold member
As shown in FIG. 3, the lower mold members 23A, 2
3B and the springs 39A and 39B are connected so as to be openable and closable.

The recess side mold members 25A, 25B are opened and closed by cylinder devices 41A, 41B which operate independently of the main body side mold members 22A, 22B.

Reference numerals 42A and 42B in FIG. 2 denote an upper plate member 43.
An upper and lower cylinder device that vertically moves A and 43B to open and close the mold member in the vertical direction.

This molding holding type 20A, 20B
On the mating surface side of the, as better understood from FIG.
Forming blades 30A and 30B that define the outer peripheral design surface shape at the joint of the molding are formed. As will be described later with reference to FIG. 5, the mold blades 30A and 30B abut each other when the molding holding molds 20A and 20B are joined, and regulate the outer peripheral (design surface) shape of the molding joint portion to a predetermined molding shape. In addition to crimping and joining, the protruding portion protruding outside the die blades 30A and 30B is cut.

It is preferable that the die blades 30A and 30B are provided with a clearance as small as possible in order to bond the design surface 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 and the like during coalescence.
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. 1, this joining method will be described in the order of steps. As shown in FIG. 1A, 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.

Next, 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 arranged forward instead of being replaced, and the molding holding molds 20A, 20B are advanced with respect to the heater 60 so that the joined end surfaces of the moldings M1, M2 are moved to the heater 60. Contact them.

The end faces to be joined of the molding are heated by a timer (not shown) provided in the heater 60 or the like for a suitable time to be in a molten state. In addition, the heater is a melting temperature of the molding, in the embodiment, 250 to 290 ° C.
Has been adjusted to. The melting amount of the end faces to be joined of the molding is appropriately determined by the material and thickness of the joined molding, and in this embodiment, it is about 1.0 from the end face.
~ 1.5 mm.

It is also possible to melt the joined end faces 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 60 is set to 600 to 800 degrees.

Next, in the welding step shown in FIG. 1D, the melted end faces are joined and pressed against each other for joining. That is, in the heating and melting step, when the heater 60 moves back out of the mold when the joined end surfaces of the moldings M1 and M2 are melted by a predetermined amount, the molding holding molds 20A and 20B are moved forward by the cylinder devices 40A and 40B to be joined together. , Each molding holding type 20A,
The molten end faces of the moldings M1 and M2 held by 20B are pressure bonded.

At this time, as will be better understood from FIGS. 4 and 5, the melted white portion M0 protruding from the predetermined outer peripheral shape of the molding by pressing the moldings M1 and M2 is provided on the molding holding molds 20A and 20B. The mold blades 30A and 30B are joined together while being regulated.

In particular, as described above, for example, FIG.
The die blades 30A and 30B on the joining surface, which is the design surface side of the moding shown on the lower side of FIG.
Since it is set to mm, the protruding portion MO of the molding joining portion is sharply cut by the die blades 30A and 30B, and the seam of the joining molding becomes inconspicuous, and the appearance of the design surface can be beautifully treated. . The clearance when the die blades 33A and 33B on the joining surface on the non-design surface side of the moding shown in the upper side of FIG. 5 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 die 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.

After the joining process is completed, in each of the molding holding molds 20A and 20B, first, the concave-side mold member 25 is formed.
A and 25B are separated prior to their body side mold members 22A and 22B. That is, as shown in FIG. 6, the recess side mold members 25A and 25B for holding the recess portions of the molding are attached to the cylinder devices 41A and 41B while the molding holding dies 20A and 20B are in the combined state.
Retreat by.

The recess side mold members 25A, 25B
As a result of the receding separation of the mold, the protruding portion S formed by the melting white in the molding recess is cut off from the main body of the molding as shown in FIG.
Adhered to and removed from the mold.

When the recess side mold members 25A and 25B are undercut and difficult to laterally slide, the upper and lower cylinder members 42A and 42B are depressurized to lower the pressure of the upper plate members 43A and 43B. The concave side mold members 25A and 25B can be laterally slid without difficulty.

After separating the concave side mold members 25A and 25B, the main body side mold members 22A and 22B are opened, and the molding in which the terminals are integrally joined is taken out.

[0032]

As shown and described above, according to the structure of the present invention, the recess side mold member for holding the molding recess is separated prior to the main body side mold member after thermal bonding of the molding ends. Thus, since the humped portion generated in the heat-bonded portion of the concave portion of the molding is removed, the humped portion in the concave portion can be effectively and surely removed.

Therefore, according to the method of the present invention, it is possible to extremely easily and surely remove the protruding portion in the concave portion, which was conventionally performed by a complicated work, and the labor of the work is greatly increased. Not only can it be reduced, but the occurrence of product defects can be suppressed, which can greatly contribute to the improvement of the appearance and quality of the product.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an example of a terminal joining device for carrying out the method of the present invention in alphabetical order together with the operation, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG.
FIG. 3 is a perspective view of a main part of the synthetic resin molding of the present invention viewed from the inside showing a terminal joining structure.

FIG. 2 is a front view of the molding holding die of the terminal joining device as seen from the joining surface side.

FIG. 3 is a front view showing a mold open state of the molding holding mold.

FIG. 4 is a plan view of a holding mold showing a heated and melted state of a joined end of a molding.

5 is a cross-sectional view taken along the line 5-5 in FIG.

FIG. 6 is a front view of a state in which the concave-side mold member of the holding mold is separated before the main body-side mold member after thermal bonding.

FIG. 7 is a partial perspective view showing an example of a state in which the terminals of the wind molding are thermally bonded.

FIG. 8 is a partial perspective view showing another example of the same.

[Explanation of symbols]

 20 Molding Terminal Joining Device 20A Molding Holding Type 20B Molding Holding Type 22A Body Side Mold Member 22B Body Side Mold Member 25A Recess Side Mold Member 25B Recess Side Mold Member 41A Cylinder Device 41B Cylinder Device 30A Model Blade 30B Model Blade M1 Molding M2 Molding J Joining part S Hami part

Claims (2)

[Claims] 1. When holding two moldings each having a recess in a holding die having a mold blade and thermally joining both ends together, a portion of the molding including the recess is formed in another main body of the holding die. The concave side mold member independent of the main body side mold member that holds the portion is held, and after the thermal bonding, the concave side mold member is separated prior to the main body side mold member, thereby thermally bonding the concave part of the molding. A method for removing a humped portion at a terminal joint portion of a molding, characterized in that a humped portion that occurs in a portion is removed. 2. The method according to claim 1, wherein the recessed portion is a glass fitting groove of the window molding, and a portion of the terminal joint portion of the molding where the groove is exposed is removed.