JP2966314B2 - Molding terminal processing method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for processing a molding, and more particularly, to a method and apparatus for processing a terminal of a molding for protection and decoration of an automobile.

[0002]

2. Description of the Related Art As shown in FIG. 4, for example, a door panel on a side surface of a vehicle body of an automobile A protects the vehicle body surface from contact with other objects due to opening and closing of the door and also serves as decoration of the side surface of the vehicle body. Rod-shaped or plate-shaped moldings M1 and M2 having a constant cross-sectional shape made of a synthetic resin are adhered. Symbol M1 in the figure
Is a front molding affixed to the front door Df, and M2 is a rear molding affixed to the rear door Dr. By the way, FIG.
5 and FIG. 6 which is a perspective view of the terminal part of the rear molding M2, the front terminal part M2f of the rear molding M2 is attached to the door D.
In order to avoid interference with the front door Df when the r is opened, the terminal portion M2f is formed in a so-called spine-like shape that reaches the main body side general portion 93 through the end portion thin portion 91 and the gradually changing portion 92. I have.

As one means for forming the terminal portion of such a molding having a constant cross section into a predetermined terminal shape, hot press molding of the terminal portion as shown in FIGS. 7 and 8 of the accompanying drawings has been proposed. I have. That is, for example, as shown in (7A) of FIG. 7, the end portion 6 of the molding material 60 having a constant cross-sectional shape continuously formed by extrusion or the like.
1 is partially cut away as shown in FIG. 7B (reference numeral 63 denotes a cutout portion, and 64 denotes a cut-out molding material portion), and the cutout portion 63 is formed. After the terminal portion 61 is heated and softened and introduced into the fixed terminal forming die portion, the movable die is moved and closed, and the terminal portion 61 is turned into a terminal having a predetermined shape 65 as shown in FIG. It is press-formed into the part 66.

[0004] This will be described in detail with reference to the process chart of FIG. 8. The molding material 60 in which the rear portion 62 of the terminal portion 61 is partially cut to form a cut portion 63 is shown in FIG.
As shown in A), the terminal portion 61 is heated and softened from the back surface portion 62 of the terminal portion 61 by a heating means 70 such as a heater and introduced into the terminal forming die portion 72 of the fixed die 71. It is needless to say that the partial removal of the back surface portion 62 of the terminal portion 61 of the molding material 60 is for improving the deformability of the surface portion of the molding material 61.

The terminal part 6 of the heat-softened molding material 60
As shown in (8B) to (8D) in FIG. 8, after the movable mold 73 is introduced into the terminal mold part 72 of the fixed mold 71 of the press mold, the movable mold 73 is closed and the terminal part having a predetermined shape is formed. It is press-molded to 66. The protruding portion (burr) 67 generated at the end portion 66 of the molding material 60 formed by press molding is trimmed and cut after removal from the mold as shown in (8E) and (8F) of FIG.

In the press forming of the terminal portion as described above, although the back surface portion 62 of the terminal portion 61 is partially cut away in order to enhance the deformability of the molding material 60, the fixed die is not used. Depending on the shape of the terminal forming mold part 72 of the mold 71, the molding material 60 may be difficult to completely follow the mold surface of the mold part 72. Also, the molding material 60 is heated from the back surface thereof, and the terminal molding die 72 of the fixed die 71 is heated.
Because the surface of the molding material on the side has a lower temperature than the back surface, as shown in FIG.
0 is the underfilled portion 6 that does not completely follow the mold surface of the terminal forming mold portion 72
9 or there is a problem that the mold surface of the terminal molding mold part 72 is not completely copied even if it cannot be said that it is a missing part.

Further, in the case where the end portion 66 of the molding material 60 as illustrated is formed into a so-called spine-cut shape of the main body side general portion 93 via the end portion thin portion 91 and the gradually changing portion 92, Due to the temperature difference between the back side 66b and the front side 66s of the terminal forming part during molding by heating from the back side as described above and the thickness of the rear side 66b, the back side 66b of the terminal forming part 66 after the molding is formed.
10, the contraction S starts later than the front side 66s, and as a result, as shown by the solid line in FIG. 10, the phenomenon that the end-side thin portion 91 bends in the back side direction b may occur. The chain line reference symbol 91s in FIG. 10 indicates the position of the desired end-side thin portion without the bending phenomenon.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve such a problem, and the terminal portion of the molding material is partially cut off at the rear and heated and softened to a predetermined shape. It is an object of the present invention to provide a method and an apparatus which can completely produce a terminal having good appearance by completely copying a mold surface without causing a blank portion in press molding.

In addition, the present invention is characterized in that, when the terminal portion is press-formed, the terminal portion is formed into a predetermined shape which becomes a main body side general thick portion via an end side thin portion and a gradually changing portion.
It is possible to improve the problem of the above-mentioned underfill portion and the problem of copyability to a mold surface, and also eliminate a bending phenomenon based on a difference in heat shrinkage that may occur in such a terminal portion shape. The present invention proposes a possible terminal processing method and apparatus.

[0010]

That is, the present invention provides:
After partially cutting off the back part of the terminal part of the molding material having a constant cross-sectional shape and heating and softening the terminal part and introducing it into the fixed terminal molding part, the movable mold is moved and the mold closed. When press-molding the terminal portion into a predetermined shape, at the time of press-molding the terminal portion, a terminal of a molding characterized in that a pressing protrusion protruded from the movable mold is pressed against the back side of the molding material to form the terminal. Related to processing method.

Further, according to the present invention, after partially removing the back surface of the terminal portion of the molding material having a constant cross-sectional shape, the terminal portion is heated and softened and introduced into the fixed terminal forming die portion.
When moving the movable mold and closing the mold, when press-molding the terminal portion into a predetermined shape that becomes the main body-side general thick portion through the end portion thin portion and the gradually changing portion, at the time of molding the terminal portion, A press-in protrusion projecting from a portion corresponding to the back side of the gradually changing portion forming portion of the movable molding material terminal portion is pressed against the molding material back side and molded, and a concave portion is formed on the gradually changing portion back side. The present invention relates to a molding terminal processing method characterized by forming.

Further, the present invention relates to an apparatus for realizing the above-mentioned method, wherein a fixed mold having a terminal section of a heat-softened molding material introduced therein and having a predetermined terminal mold section, and a fixed mold section having a predetermined terminal mold section are provided. The present invention relates to a terminal processing apparatus for molding, comprising a movable die for pressing a terminal portion of the introduced molding material from the back surface side, and a pushing projection protruding from a surface of the movable die.

Still further, in the same apparatus, a terminal portion of a molding material which has been softened by heating is introduced, and the terminal portion is formed into a body-side general thick portion through an end-side thin portion and a gradually changing portion. Including a fixed mold having a terminal molding die portion and a movable mold for pressing the terminal portion of the molding material introduced into the fixed molding terminal molding portion from the back side, the gradual change of the movable molding material terminal portion. The present invention relates to a terminal processing device for molding, wherein a pushing projection is provided on a mold surface corresponding to a portion forming portion.

[0014]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a main part showing a terminal processing step of one embodiment of the present invention in order, FIG. 2 is an enlarged cross-sectional view showing a press-formed state of the terminal part, and FIG. FIG.

First, as shown in FIG. 1A,
For example, the back surface portion 22 of the terminal portion 21 of the molding material 20 having a constant cross-sectional shape continuously formed by extrusion molding or the like.
Is partially cut to form a cut portion 23. The cut portion 23 is formed, for example, by the reference numeral 63 in FIG.
The shape and the size to be cut out are appropriately determined according to the shape of the surface of the terminal to be processed.

The molding material 2 on which the cutout portion 23 is formed
In the case of 0, the terminal portion 21 is heated and softened by the heating means 30 such as a heater from the back surface 22 side of the terminal portion 21 as shown in the figure, and is introduced into the terminal forming die portion 33 of the fixed die 31.

The terminal part 2 of the heat-softened molding material 20
As shown in FIGS. 1 (1B) to 1 (D), after the movable mold 1 is introduced into the terminal mold 33 of the fixed mold 31 of the press mold, the movable mold 32 is closed, and The molding material portion is press-formed into a terminal portion 26 having a predetermined shape by moving and deforming the molding material portion in the formed cutout portion 23. At this time, the molding material portion that has moved and deformed is often cut off portion 2
3 and are welded together, but do not necessarily have to be completely fused in the cutout 23.

The present invention is characterized in that, at the time of this press forming, the pressing protrusion 35 protruding from the movable mold 32 is pressed against the back surface of the terminal portion 21 of the molding material 20 to form the molding. . This pushing protrusion 35
As shown in the enlarged cross-sectional view of the press forming state in FIG. 2, the terminal portion 21 is pressed against the back surface 22 of the terminal portion 21 at the time of press forming the terminal portion 21 of the molding material 20 by moving the movable mold 32. The surface portion 24 of the base 21 follows the terminal forming die portion 33 of the fixed die 31. Therefore, it is effective that the pushing protrusion 35 is formed at a portion where the surface portion 24 of the terminal portion 21 of the molding material 20 does not easily follow the terminal forming die portion 33 of the fixed die 31.

At the same time, the pushing protrusion 35 is formed on the back surface 22 of the terminal portion 21 of the molding material 20 after molding, as shown in FIG.
(1E), the recess 45 having the shape of the push-in protrusion is formed, so that the protrusion is formed with the most effective size and shape in a range where there is no functional limitation on the appearance of the molding and the mounting portion. You.

A protruding portion (burr) 27 which is a surplus portion of the molding material generated at the end portion 26 of the molding material 20 which has been press-formed, as shown in FIGS. The product 40 is trimmed and cut.

In the molding product 40 exemplified as an embodiment of the present invention, the terminal portion 26 includes an end-side thin portion 41, a gradually changing portion 42, and a main-body-side general portion 43, as described in the section of the prior art. It has already been described that in such a terminal-shaped press molding, there is a possibility of causing a problem such as a missing portion or copyability, or a problem such as bending due to a difference in heat shrinkage. As expected. Therefore, effective terminal processing in such a case will be described below.

That is, in the press molding state shown in FIG. 2, the terminal portion 21 (26)
2 and the main body side general portion 43. At this time, the rear end portion 22 of the molding material 20 terminal portion 21 is partially cut away in order to enhance deformability. However, since the terminal shape 33 of the fixed die 31 becomes complicated, the molding material 2
0 does not easily follow the mold surface of the mold portion 33. Also, the molding material 20 is heated from the back surface 22 thereof,
Due to the fact that the temperature of the front surface of the molding material on the side of the terminal forming mold portion 33 is lower than that of the rear surface portion, in rare cases, the underfill portion in which the molding material 20 does not completely follow the mold surface of the terminal forming mold portion 32 As described above, or the mold surface of the terminal forming mold portion 33 may not be completely copied even if it is not a missing portion, as described above.

Further, in such a terminal portion 26, the terminal molding portion 21 is formed at the time of molding by heating from the back side.
There is a temperature difference between the back side and the front side, which causes a difference in shrinkage of the molded product, and the end side thin portion 41 as described above.
May be bent toward the back side.

In the present invention, in order to solve all such problems, the end portion 21 of the molding material 20 is formed into a body-side general thick portion 43 via the end-side thin portion 41 and the gradually changing portion 42. When press-molding the terminal portion 26, as shown in FIGS.
At the time of forming the molding 1, the pressing projection 35 protruding from a portion corresponding to the back surface side of the gradually changing portion forming portion (42) of the molding material terminal portion 21 of the movable mold 32 is pressed against the molding material back surface. In addition, it is proposed to form a concave portion 45 on the back side of the gradually changing portion 42.

As is apparent from FIG. 2, the pushing projection 35 protruding from a portion corresponding to the back surface side of the gradually changing portion forming portion (42) of the molding material terminal portion 21 of the movable mold 32 is attached to the molding material back surface. Side to form a larger pressure P on the part of the molding material during press forming.
In addition, the gradual-change portion forming portion (42), which has poor mold followability and has a problem with underfill portions and copyability, is strongly pressed against the gradual-change portion 34 of the terminal molding die portion 33 of the fixed die 31 to solve the problem. .

Further, as shown in FIG. 3, the pushing protrusion 35 is formed at a corresponding portion on the back surface of the molded product 40 after molding, that is, on the back surface side of the gradually changing portion 42 of the terminal portion 26. 45 is formed. This recess 45
As shown by the arrow S in (3A) and (3B) of FIG. 3, the rear surface of the molded product absorbs and shrinks heat shrinkage that may occur later than the front surface due to the difference in heating temperature. Since the concave portion 45 is provided on the back surface side of the gradually changing portion 42, the light is not transmitted in the direction of the body-side general thick portion 43.
This solves the phenomenon that the end-side thin portion 41 bends in the back surface direction.

Note that the pushing protrusion 35 is formed on the inclined surface 34C of the gradually changing portion 34 of the terminal forming die portion 33 of the fixed die 31.
If it is formed in a shape having an inclined surface 35C substantially similar to
This is effective for the indentation pressure at the time of the above-mentioned molding and the shrinkage absorption after the molding.

[0028]

As shown and described above, according to the present invention, when the rear surface of the terminal portion of the molding material is partially cut off and heated to soften and press-molded into a predetermined shape, the pushing protrusion is formed by the molding material. Since the molding is performed by pressing against the back surface side, the mold surface can be completely copied without generating any underfilled portion, so that terminal processing with good appearance can be efficiently produced.

Further, the present invention is characterized in that, when the terminal portion is press-formed, the terminal portion is formed into a predetermined shape which becomes the main body side general thick portion via the end portion thin portion and the gradually changing portion.
Since the pressing projections, which are provided on the back side of the gradual-change portion forming portion, are pressed against the back side of the molding material and molded, the above-described problem of the underfill portion and copyability to the mold surface are described. In addition, the bending phenomenon based on the difference in heat shrinkage, which may occur in such a terminal portion shape, can be eliminated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing a terminal processing step according to an embodiment of the present invention in order.

FIG. 2 is an enlarged cross-sectional view showing a press-formed state of the terminal portion.

FIG. 3 is a cross-sectional view of a press-formed terminal processing portion.

FIG. 4 is a side view of an automobile showing an example of mounting a molding.

5 is an enlarged cross-sectional view of a portion denoted by reference numeral 5 in FIG.

FIG. 6 is a perspective view of a front terminal portion of the rear mall shown in FIG. 4;

FIG. 7 is a perspective view sequentially showing steps of processing a mall terminal portion from a mall material.

FIG. 8 is a sectional view sequentially showing a conventional process of press-forming a molding terminal portion from a molding material.

FIG. 9 is an enlarged cross-sectional view showing a press working state of the molding end portion of FIG. 8;

FIG. 10 is a cross-sectional view showing a heat-shrinkable state of a conventional molding terminal.

[Explanation of symbols]

 Reference Signs List 20 molding material 21 molding material terminal portion 23 cutout portion 26 terminal (working) portion 31 fixed type 32 movable type 33 terminal forming die portion 34 gradually changing portion of terminal forming die portion 35 pushing protrusion 40 molding product 41 thin end side Part 42 Slowly changing part 43 General part on main body side 45 Recess

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Isamu Eto 8-1, Tocho, Fujii-cho, Anjo-shi, Aichi Pref. JP-A-55-15812 (JP, A) JP-A-61-235114 (JP, A) JP-A-61-44612 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B29C 43 / 00-43/58 B29C 57/00-57/12

Claims (5)

(57) [Claims] 1. A terminal part of a molding material having a constant cross-sectional shape is partially cut away, and the terminal part is heated and softened and introduced into a fixed terminal molding part. When the terminal portion is closed and press-molded into a predetermined shape, the press-molding of the terminal portion is performed by pressing a pressing protrusion protruding from the movable mold against the back side of the molding material. Molding terminal processing method. 2. The terminal portion of a molding material having a constant cross-sectional shape is partially cut away, and the terminal portion is heated and softened and introduced into a fixed terminal molding portion. When the terminal portion is closed and press-molded into a predetermined shape that becomes the main body-side general thick portion via the end-side thin-walled portion and the gradually changing portion, at the time of molding the terminal portion, the movable molding material terminal is formed. A pressing projection protruding from a portion corresponding to the back side of the gradually changing portion forming portion of the portion is pressed against the molding material back side to form and a concave portion is formed on the gradually changing portion back side. Molding terminal processing method. 3. A fixed die having a terminal part of a molding material heated and softened and having a predetermined terminal forming part, and a terminal part of the molding material introduced into the terminal part of the fixed part being a back side. A terminal processing apparatus for a molding, comprising: a movable die that presses from above, and wherein a pushing protrusion is provided on a surface of the movable die. 4. A predetermined terminal forming die portion for introducing a terminal portion of a molding material which has been softened by heating, and forming the terminal portion into a body-side general thick portion through an end-side thin portion and a gradually changing portion. It has a fixed mold and a movable mold that presses the terminal part of the molding material introduced into the terminal mold part of the fixed mold from the back side, and corresponds to a gradually changing part forming part of the movable molding material terminal part. A terminal processing device for a molding, characterized in that a pushing projection is provided on a mold surface to be formed. 5. The terminal processing apparatus of a molding according to claim 4, wherein the pushing protrusion is formed in a shape having an inclined surface substantially similar to an inclined surface of a gradually changing portion of the fixed terminal forming die portion.