JPH048527A - Method for intermittently manufacturing side molding from continuously extruded molding raw material - Google Patents

Abstract

PURPOSE:To from a molding in a desired shape and at a predetermined length by conducting cutting and terminal part molding, etc., through closing a molding port during the extrusion of a molding raw material or by changing the opening shape of the molding port. CONSTITUTION:An extrusion molding port 3 is completely closed by a second shutter 4b. The shutter 4b retreats at a constant speed, the molding raw material is extruded from the extrusion molding port 3 so that the inclined end face 26 of the molding material is molded, and the molding material is taken over at a constant speed 3 by a take-up mechanism 12. The shutter 4b stops when the extrusion molding port 3 is opened almost half, and the molding material having the width of almost the half of the whole width is molded. The second shatter 4b further retreats and the inclined face 27 of the molding material is molded until the face reaches the whole width. In a state where the extrusion forming port 3 is opened to its full width, the first shutter 4a advances at a constant speed, the extrusion molding port 3 is closed gradually, and the molding material equipped with a step 28 gradually diminishing in thickness is molded. The first shutter 4a further advances, the extrusion molding port 3 is closed completely, the an inclined end 29 is formed at the other end of the molding material.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a side molding (a side molding) which can be molded only by extrusion molding in the form of a double track, which is attached to the side of an automobile body for cushioning or decoration. The present invention relates to a molding method (hereinafter simply referred to as "molding").

In the following explanation, the terms "molding" and "molding material" will be used separately, and "molding" refers to the finished state of molding;
"Molding material" refers to a material in the process of being continuously extruded from a molding die.

Prior art and its problems In the conventional molding method, after a molding material with a constant cross-sectional shape is continuously formed by extrusion molding,
This long molding material is cut to a predetermined size, and then end caps are formed on both ends of the cut molding material by injection molding.

However, in this molding method, a joining line occurs between the extrusion molded part and the injection molded part in the molding, and
Since it is difficult to make the color tone, texture, etc. of the image forming part exactly the same, the appearance becomes poor. Also,
The injection molding process became indispensable, requiring equipment costs such as molding machines and molds, and additional man-hours, resulting in higher costs.

Means for Solving the Problems The present invention provides a first shutter having a surplus raw material discharge hole and disposed so as to be movable forward and backward to open and close the forming mouth of a molding die, and An extrusion molding device is used, which includes a second shutter that is arranged to be movable forward and backward in a direction different from the forward and backward movement direction of the first shutter so as to open and close the molding opening, and the first shutter stops retracting. Then, from the state where the second shutter stops moving forward and the molding port is fully closed, and the molding raw material is discharged from the discharge hole and extrusion molding is stopped, the second shutter is moved back and the molding port is fully opened. , after fully opening, stop the shutter, then move the first shutter forward to fully close the molding port, after fully closing, move the shutter backward to fully open and stop the molding port, then the second shutter. fully closing the molding port by moving the shutter forward;
Thereafter, by repeating the process of retracting the second shutter and fully opening the molding port, and by discharging the excess raw material from the discharge hole when the molding port is not fully opened, the molding is completed. The above problem was solved by a method of manufacturing side moldings intermittently from molding raw materials that are continuously extruded from a molding opening of a die.

Function According to the present invention, by closing the molding port or changing the opening shape of the molding port during extrusion of the molding raw material,
Cutting, end portion molding, etc. are performed, and moldings having a desired shape and a predetermined length can be formed intermittently from the continuously extruded molding material.

Since the molding material is continuously extruded into the desired shape, a seamless molding is obtained as a final product.

Therefore, it is possible to obtain a molding that has a uniform color and texture throughout and has a good appearance. Further, there is no need to separately injection mold the terminal portion on the molding material, and a molding machine, mold equipment, and work for injection molding are no longer necessary.

Example Hereinafter, the present invention will be explained in more detail with reference to Examples.

Molding M attached to the side of the car body,
A molding apparatus of the present invention for molding (M2) [see FIG. 1] is shown in FIGS. 2 and 3.

The molding die 2 is formed with an extrusion molding port 3 corresponding to the cross-sectional shape of the molding Ml (M2).
A first shutter 4a is attached to the front end surface of this molding die 2, and a molding material M is continuously extruded from the extrusion molding port 3.
The second shutter 4b is mounted so as to be movable forward and backward along the thickness direction of the first shutter 4a.
It is mounted so that it can move forward and backward along the width direction of the molding material M°, which is perpendicular to the direction of forward and backward movement of the molding material M°.

That is, the first shutter 4a is guided by a pair of shutter guides 5a attached to the front end surface of the molding die 2,
The male threaded shaft 7a, which is the rotating shaft of the motor 6a, and the female threaded member 8a attached to the first shutter 4a are screwed together, and the first shutter 4a is rotated in the molding material M° by the forward and reverse rotation of the motor 6a. It moves forward and backward along the thickness direction. Further, since the structure in which the second shutter 4b moves forward and backward is the same as the structure in which the first shutter 4a moves forward and backward, the description thereof will be omitted by adding the suffix rbJ to the corresponding same reference numerals.

In addition, as shown in FIGS. 4, 6 to 8,
Surplus material discharge holes 9a are provided at the tips of the first and second shutters 4a and 4b, respectively.

9b is provided, and when each shutter 4a or 4b moves to the forward end and closes the extrusion molding port 3 of the molding die 2 (see FIG. 4 or FIG. 6), the extrusion molding of the molding die 2 is stopped. The port 3 and the surplus raw material discharge holes 9a, 9b of each shutter 4a, 4b are connected via a communication path 11a911b provided in each shutter 4a, 4b.

In addition, in FIG. 2, a take-off device 12 for taking off the molding material M' that is continuously extruded from the extrusion port 3 of the molding die 2 is connected to the molding die 2 and provided horizontally. .

This take-off device 12 also serves to transport the molding material M'', and a cooling device 13 is provided in the middle of the take-off device 12 to cool the molding M'' (M2) cut into a predetermined length. ing.

Transaction speed of withdrawal device 12 and each shutter 4a, 4
The rotational speed of motors 6a and 6b for driving b,
Both of these drive timings are controlled by the control device 14.

Next, one cycle of the molding method of the present invention will be explained with reference to FIGS. 9(a) and 9(b).

In addition, in the same figure (a), the arrow P indicates the extrusion direction of the molding material M°, and in the same figure (b), the solid line and the broken line indicate the movement of the first shutter 4a and the second shutter 4b, respectively. Indicates the condition.

When the extrusion molding port 3 is completely closed by the second shutter 4b (see Fig. 4), the second shutter 4b is gradually retreated (see Fig. 5), and the extrusion molding When the mouth 3 is gradually opened, the molding material M' is continuously extruded from the extrusion molding port 3 of the molding die 2, and this molding material M' is transferred to the take-off device 12 disposed near the extrusion molding port 3. The molding M1 is pulled out at a constant speed, and the "x" portion, which is one end of the molding M1, is formed obliquely, and as shown in FIG. When the molding port 3 is fully opened, the molding material M" is extruded by a predetermined length, and the portion r Y J of the molding M is molded (see FIG. 9). Molding M1
While molding the "Y" part of the second shutter 4
b is retreated to a position where it does not interfere when the first shutter 4a moves forward, and the surplus material discharge hole 9a and the extrusion molding port 3 are not in communication.

When the extrusion port 3 is fully open, the "
After the molding M1 is molded, the first shutter 4a moves forward as shown in FIG.
is disconnected, and as a result, the other terminal, “Z
'' is molded, the extrusion molding port 3 of the molding die 2 is closed by the first shutter 4a, and with this, the first half cycle is completed and the molding M1 is molded. Even while the extrusion molding port 3 is closed by the first shutter 4a, the molding material M'' is continuously extruded. Since the discharge hole 9a is communicated with through a communication path 11a provided in the first shutter 4a, the forming raw material 15 is discharged through the surplus material discharge hole 9a. Therefore, the pressure of the molding raw material 15 inside the molding die 2 does not increase, and the next molding can be performed without support.

Subsequently, from the state shown in FIG. 6, the first shutter 4a is moved backward to mold the "2" portion, which is one end of the molding M2, and then the molding is removed from the extrusion molding port 3 in the fully open state. Extrude material M° to a predetermined length to form the "Y" part of molding M2,
Thereafter, the second shutter 4b is moved forward to form and cut the other end of the molding M2, the "X" portion, thereby completing the latter half cycle, and the molding M1 A molding M2 having a symmetrical shape is formed. In this case, the forming die 2
The extrusion molding port 3 is closed by the second shutter 4b, but the surplus material discharge hole 9b provided in the second shutter 4b and the extrusion molding port 3 are closed by the second shutter 4b. The molding material 15 is continuously discharged from the surplus material discharge hole 9b of the second shutter 4b. In this way, after going through the reverse process of molding M1 described above,
Molding M with a symmetrical shape to the above molding M
2 rZ' J , rY' J .

The "X'" portions are sequentially molded.

For this reason, the first and second two shutters 4a, 4b
By using this, one end portion 16 of each molding M1°M2 can be molded diagonally, and a pair of symmetrical moldings M + and M2 can be molded alternately and continuously.

Moreover, the first shutter 4a and the second shutter 4b
By making the timing of the forward and backward movement of the molding member different from that of the above-described embodiment, a molding having a more complicated shape can be manufactured.

FIGS. 1O and 11 are diagrams illustrating an example in which a molding M3 having a complicated shape is manufactured. 1st
In Figure 0 (c), the solid line indicates the forward/backward movement of the first shutter, and the broken line indicates the forward/backward movement of the second shutter.

FIG. 10(A) is a plan view of the molding M3 according to this embodiment, and FIG. 10(B) is a side view thereof. FIG. 10(c) shows the first shutter 4a and the second shutter 4.
The solid line indicates the forward and backward movement of the first shutter, and the broken line indicates the forward and backward movement of the second shutter. Figure 11 shows molding M3 after molding has been completed.
FIG.

The molding M3 of this embodiment has a width dimension that changes approximately in the middle in the longitudinal direction, and a thickness dimension that changes at one end. Such molding M3 is manufactured by the following operation. Arrow Q indicates the extrusion direction of the molding material.

[Start of operation] The first shutter 4a is in the retracted position. The second shutter 4b is in the forward position. The extrusion molding port 3 is completely closed by a second shutter 4b.

[First step: i-j second shutter 4b is moved back at a constant speed, and extrusion molding port 3 is gradually opened. The molding raw material is continuously extruded from the extrusion molding port 3 to form the inclined end surface 26 of the molding material. The molding material is drawn off at a constant speed by a drawing device 12.

Note that when the second shutter 4b retreats at an unconstant speed, a curved end surface is obtained.

[Second step: j=kl The second shutter 4b is stopped with the extrusion molding port 3 approximately half open. The molding raw material is continuously extruded from the extrusion molding port 3. Therefore, a molding material having a width approximately half of the overall width is formed. The molding material is
It is taken off by a taking off device 12 which operates at a constant speed.

[Third Step 2-1] The second shutter 4b is further moved backward at a constant speed and stopped at the backward limit position. The molding raw material is continuously extruded from the extrusion molding port 3. The sloped surface 27 is formed in the molding material until it reaches the entire width. The molding material is drawn off by a drawing device 12 which operates at a constant speed. Note that when the second shutter 4b retreats at an unconstant speed, a curved end surface is obtained.

[Fourth Step: 1 to m] With the extrusion molding port 3 fully open, the molding raw material is continuously extruded from the extrusion molding port 3. Therefore, a molding material having a shape corresponding to the shape of the extrusion molding port 3 is formed. The molding material is drawn off by a drawing device 12 which operates at a constant speed.

[Fifth step: m-n] The first shutter 4a is moved forward at a constant speed, and the extrusion molding port 3 is gradually closed. The molding raw material is continuously extruded from the molding port 3 to form a molding material having a stepped portion 28 whose thickness gradually decreases.

The molding material is drawn off at a constant speed by a drawing device 12. Note that when the first shutter 4a moves forward at an unconstant speed, a curved stepped portion 28 is obtained.

[Sixth step=n~0] The first shutter 4a is stopped with the extrusion molding port 3 approximately half closed. The molding raw material is continuously extruded from the extrusion molding port 3. Therefore, a molding material having approximately half the thickness is formed.

The molding material is taken off by a taking off device 12 which operates at a constant speed.

[Seventh step: op] The first shutter 4a is further advanced at a constant speed and stopped at the forward limit position. The extrusion molding port 3 is completely closed by the first shutter 4a. The molding raw material is the first
During the forward movement of the shutter 4a, it is continuously extruded from the extrusion molding port 3. Therefore, an inclined end 29 is formed at the other end of the molding material.

[8th process to 14th process] The reverse operation is performed from the seventh step toward the first step.

The first shutter 4a and the second shutter 4b are operated at a constant forward and backward movement speed.

By performing the operations from the first step to the seventh step, moldings M3 having different width and thickness dimensions are formed. Furthermore, by carrying out the operations in the eighth to fourteenth steps, a pair of left-right symmetrical moldings is formed.

In the above two embodiments, the first shutter 4a and the second
The manufacturing method is shown in which the shutter 4b operates only in the orthogonal direction. However, each shutter 4a
, 4b do not necessarily have to be orthogonal to each other, and the second shutter 4b may be configured to operate at a fixed angle, for example, at an angle of 60° with respect to the operating direction of the first shutter 48. You can also do it.

In addition, although the number of shutters is two in the above embodiment, the shutters that move forward and backward toward the molding opening 3 from four directions at 90° intervals may be operated independently, or at 45° intervals with respect to the upper surface of the molding. By moving the five shutters forward and backward, it is also possible to form a double-line molding with a different cross-sectional shape at each position in the longitudinal direction.

Effects of the Invention Since the present invention has the above configuration, even a molding having a double line shape can be continuously extruded without any seams. Therefore, the molding has a uniform color and texture throughout, making it possible to obtain a molding with a good appearance.

Since the molding is manufactured only by extrusion molding, there is no need to perform injection molding, and there is no need for molding machines, mold equipment, or injection molding operations, so molding costs can be significantly reduced. .

In addition, in the method of claim 2, the portion where the cross-sectional shape changes can be made into a linear slope or a curved surface.

The method of claim 3 has the advantage that moldings having different widths and thicknesses in the longitudinal direction can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a side view of an automobile 1 equipped with side molding Ml (M2), FIG. 2 is an overall side view of a molding apparatus according to the present invention, and FIG. 4 to 6 are partial front views of the molding die 2 showing the state of movement of the first and second shutters 4a and 4b, and FIG. 7 is a cross section taken along line A-A in FIG. 6. Figure 8 is a cross-sectional view taken along line BB in Figure 4, and Figure 9 (A) is a symmetrical side molding M+ with one end formed obliquely.
, FIG. 10 is a plan view of M2, and FIG.
(A) is a plan view of a side molding manufactured according to another embodiment, and FIG.
The side view of the side molding shown in FIG. 10(C) shows the state of forward and backward movement of the first and second shutters 4a and 4b when manufacturing the side moldings shown in FIGS. 10(A) and (B). The figure shown in FIG. 11 is a perspective view of the side molding shown in FIGS. 10(A) and 10(B). Ml, Mz, M3: Side molding M゛:
Molding material 2: Molding die 3: Extrusion molding port 4a: First shutter 4b: Second shutters 9a, 9b: Surplus raw material discharge hole 15: Molding raw material diagram Figure 10 Figure 11 Procedure amendment 1991 July 26th

Claims (3)

[Claims] (1) a first shutter that has a surplus material discharge hole and is movable forward and backward to open and close the forming opening of the forming die;
An extrusion molding apparatus is used, which includes a second shutter having a surplus raw material discharge hole and disposed to be movable forward and backward in a direction different from the direction of forward and backward movement of the first shutter so as to open and close the molding port. , the first shutter is moved back and stopped, the second shutter is stopped moved forward, the molding port is completely closed, the molding material is discharged from the discharge hole, and extrusion molding is stopped, and then the second shutter is moved back. fully open the molding port, stop the shutter after fully opening, then move the first shutter forward to fully close the molding port, and after fully closing, move the shutter backward to fully open the molding port. by repeating the steps of moving the second shutter forward to fully close the molding port, and then retracting the second shutter to fully open the molding port, and A method of manufacturing side moldings intermittently from molding raw materials that are continuously extruded from the molding port of a molding die, by discharging excess raw material from the discharge hole when the molding port is not fully opened. (2) The manufacturing method according to claim 1, wherein the forward or backward movement of both shutters is at a constant speed or at an unconstant speed. (3) The manufacturing method according to claim 1 or 2, wherein the forward or backward movement of both shutters includes a stopped state in which the molding port is partially closed.