JP3805872B2 - Molding molding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molding method for a molding attached to an automobile or the like.
[0002]
[Prior art]
For example, as shown in FIG. 8, elongated plastic strips M1 and M2 are attached to the door portions Df and Dr on the side surface of the automobile C along the front-rear direction of the vehicle body for decoration and door protection. It has been.
[0003]
As shown in FIG. 9 which shows a cross section of the portion indicated by the symbol A in FIG. 8, the moldings M1 and M2 have a clip 50 fixed in advance on the back surface near the terminal portion, and the clip 50 is inserted into a hole formed in the vehicle body. By doing so, the terminal portions of the moldings M1 and M2 are attached to the vehicle body. A positioning member (not shown) made of pins or the like is fixed to a required position on the back surface of the molding, and the positioning member is inserted into a positioning hole formed in the vehicle body for positioning when the molding is attached. There is also.
[0004]
Moreover, in the said automotive molding, it is set as the predetermined | prescribed shape from the viewpoint of the prevention of interference between molding terminal parts at the time of opening and closing of a door, or a design. That is, the front terminal portion M2f of the rear molding M2 is connected to the end thin portion Mc1 in order to avoid interference with the front door Df or the rear end of the front molding M1 when the rear door Dr is released. And a so-called back-cut shape that reaches the general portion Mo via a shape changing portion Mc composed of a gradually changing thickness portion Mc2.
[0005]
Conventionally, a method of fixing a projecting member such as a clip or a positioning member to the back surface of the molding is generally performed by an adhesive or ultrasonic welding. However, the fixing of the protruding member with the adhesive has a problem that it is difficult to say that the adhesive strength between the rear surface of the molding and the protruding member is sufficient. Further, in both the method using the adhesive and the method using ultrasonic welding, there is a problem in that the fixing of the projecting member and the molding of the molding must be performed in separate steps, which requires man-hours.
[0006]
Further, as a molding method for performing both the fixing of the clip to the molding back surface and the shaping of the shape changing portion at a time, the following injection molding and high frequency heating are used (Japanese Patent Laid-Open No. Sho 61-235114). (See the publication).
[0007]
As shown in FIG. 10, molding by injection molding is performed by first forming an end portion 61 of an extruded product 60 having a predetermined dimension in a predetermined cross-sectional shape according to a desired molding into a cavity having a molding end shape. The end portion 61 of the extruded product 60 is positioned so as to face the cavity 66. At that time, the clip 50 is set in the cavity 66. Next, a molten resin is injected into the cavity 66 to form an end portion of the molding integrated with the clip 50 at the end 61 of the extruded product 60 to obtain a desired molding.
[0008]
On the other hand, as shown in FIG. 11, molding of the molding by high-frequency heating is performed by using split molds 81 and 85 in which mold surfaces 82 and 86 having the shape of the molding terminal portion are formed. A clip 90 made of a material having a small dielectric loss is set on the mold surface 86 to be shaped, and a terminal portion 71 of the extruded product 70 with the back side cut out is disposed between the mold surfaces 81 and 85, and the terminal portion 71 is The molding end portion is formed by pressing and softening by high-frequency heating so that the base 91 of the fixing clip 90 is buried in the back surface. The split dies 81 and 85 are made of a material having a small dielectric loss.
[0009]
However, in the case of the injection molding, there is a problem that a boundary line is generated between the injection-molded terminal portion and the extrusion molded product portion, and the appearance of the molding is impaired. Further, in the case of the high frequency heating, there is a problem that the clip 90 is limited to a material (polyacetal resin or the like) that is not softened by high frequency heating, and the material of the fixing clip cannot be freely selected from the viewpoint of strength and cost.
[0010]
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned points, and at the same time as forming the shape changing portion, it is possible to firmly fix the projecting member such as a clip or a positioning member, and there are few restrictions on the material of the projecting member that can be used. It is an object of the present invention to provide a molding method having a good appearance of the shape changing portion.
[0011]
[Means for Solving the Problems]
The present invention includes a back surface processing step for forming a shaping space on the back surface by removing a required amount of the back surface of a required portion of the extruded product, and a design surface side split mold for shaping the design surface side of the extruded product. And a press die composed of a back side split mold for shaping the back side, and a projecting member such as a clip or a positioning part is detachably held on the mold surface of the back side split mold to design the base of the projecting member Protruding member holding step for projecting toward the surface-side split mold, heating softening step for heating and softening the back surface removal portion of the extruded product, and molten resin required for the back surface of the extruded product corresponding to the position of the protruding member And a resin injection / pressing step for shaping the back surface removal portion by pressing the extruded product with a press die and fixing the protruding member on the back surface side of the extruded product after the amount is injected. Related to the molding method.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a back surface processing step of an extruded product in one embodiment of the present invention, FIG. 2 is a cross-sectional view showing a process from a projecting member holding step to a resin injection / pressing step, and FIG. FIG. 4 is a perspective view showing a mold surface of a back side split mold used in the embodiment, and FIG. 5 is a cross section showing a resin injection / press process in the embodiment. FIG. 6 is a sectional view showing a resin injection / pressing process in still another embodiment, and FIG. 7 is a sectional view of an embodiment of a positioning member.
[0013]
The present invention is a method for forming a molding having a shape changing portion in a required portion, and includes a back surface processing step, a projecting member holding step, the heat softening step, and a resin pouring / pressing step. In the following embodiments, description will be mainly given of molding of a molding in which the terminal portion is a shape changing portion and the projecting member is a clip.
[0014]
First, in the back surface processing step, as shown in FIG. 1, for a plastic extruded product 10 such as a vinyl chloride resin which is extruded in a predetermined cross-sectional shape in advance according to a desired molding shape and cut to a required length. The required amount of the back surface 12 of the terminal portion 11 is removed by a cutting device such as a cutter or an end mill to form a shaping space 15. It is preferable that the shaping space 15 has a shape and depth corresponding to the shape change portion of the molding. That is, the portion corresponding to the thick portion in the shape changing portion is formed shallow, and conversely, the portion corresponding to the thin portion in the shape changing portion is formed deep.
[0015]
Further, on the back surface 17 of the general portion 16 in the vicinity of the back surface removing portion 13 in which the shaping space 15 exists (shows the entire portion where the shaping space 15 exists and includes the design surface 14 side portion, the same applies hereinafter). The projecting member fixing recess 20 is formed by cutting or the like. The protruding member fixing recess 20 is slightly larger than the base portion of the protruding member described later, and the depth is preferably larger than the height of the base portion of the protruding member.
[0016]
In the projecting member holding step, the projecting member 40 is detachably held on the mold surface 37 of the back-side split mold 35 of the press die 30 as shown in FIG. The press die 30 shapes the back surface removal portion 13 of the extruded product 10 into a desired shape, and disposes and fixes the projecting member 40 in the projecting member fixing recess 20 on the back surface 17 of the general portion 16 of the extruded product 10. Therefore, the design surface side split mold 31 for shaping the design surface 14 side of the extruded product 10 and the back side split mold 35 for shaping the back surface 12 side are configured.
[0017]
The design surface side split mold 31 is formed with a back surface removal portion mold surface 32 and a general portion mold surface 33 each having a shape corresponding to a molding terminal portion (shape changing portion). Further, the rear surface side split mold 35 is also provided with a back surface removal portion mold surface 36 and a general portion mold surface 37. In the back surface side split mold 35 of this example, the back surface removal portion mold surface 36 and the general portion mold surface are used. It is flush with the mold surface 37. Further, the general-part mold surface 37 of the back-side split mold 35 is formed with a projecting member holding recess 38 at a position corresponding to the projecting member fixing recess 20 of the extruded product 10. The protruding member holding recess 38 is configured to hold the protruding member 40 so as to be detachable. The protruding member 40 has a size that allows the head 41 of the protruding member 40 to be held by frictional resistance during insertion. The base 42 has such a depth that the base 42 protrudes from the mold surface 37 at the periphery of the projecting member holding recess 38 toward the design surface side mold 31.
[0018]
In this example, the projecting member 40 is made of a clip used when the molding is attached to the vehicle body or the like, and is made of an appropriate material and structure such as plastic. In this example, the head is enlarged from the diameter of the shaft 43. 41 and the base part 42 are made of a synthetic resin formed at the end of the shaft part 43. A flange 44 is formed on the side surface of the shaft portion 43 at a predetermined distance from the base portion 42. The flange 44 closes the outer surface of the protruding member holding recess 38 around the shaft portion 43 when the head 41 of the protruding member 40 is inserted into the protruding member holding recess 38 of the rear surface side split mold 35, so that injection / pressing is performed. This is to prevent the molten resin from entering the protruding member holding recesses 38 and curing during the process.
[0019]
The protruding member 40 may be a positioning component such as a pin. FIG. 7 shows a protruding member 40A made of a positioning component. Reference numeral 41A in the projecting member 40A is a pin-shaped head inserted into the positioning hole of the vehicle body, 42A is a shaft portion, 43A is a base portion, and 44A is a flange. Further, the flange 44A is formed with a hole 45A into which a holding pin (not shown) erected around the protruding member holding recess 38 of the rear surface side split mold 35 is inserted. By the insertion, the protruding member 40A is detachably held on the rear surface side split mold 35. Of course, the protruding member as the clip and the positioning component is not limited to the shape described above.
[0020]
In the heat softening step, as shown in FIG. 2 (2-B), the back surface removal portion 13 of the extruded product 10 after the back surface processing step is heated and softened by a heating means 45 such as a heater. The heating temperature at this time is a temperature at which the end portion 11 of the extruded product 10 can be easily deformed, and varies depending on the material of the extruded product, the heating time, and the like. In this example in which the extruded product 10 is made of vinyl chloride resin, the temperature of the heating means 45 varies depending on the heat source, but is usually set to about 300 ° C. in the case of hot air. In addition, when this back surface removal part 13 is heated, you may heat the projection member fixing recessed part 20 of the general part 16 back surface 17 of the extrusion molded product 10 simultaneously. In addition, the heat softening step may be performed by holding the extruded product 10 on a holding jig (not shown) of the extruded product 10, but the design surface side of the press die 30 as in this example. It is efficient to set it on the split mold 31.
[0021]
In the resin pouring / pressing step, first, as shown in FIG. 2 (2-C), the extruded product 10 is arranged on the design surface side split mold 31 so that the back surface 12 faces the back surface side split mold 35. The molten resin P is injected into the protruding member fixing recess 20. The molten resin P preferably has at least good adhesion to the extruded product 10. For example, when the extruded product 10 is made of a vinyl chloride resin, it is preferably a vinyl chloride resin. At that time, the molten resin P preferably has adhesiveness to the protruding member 40, but this requirement is not always necessary. The reason is that the base portion 42 of the projecting member 40 has a diameter larger than that of the shaft portion 43, and in addition, the height of the base portion 42 of the projecting member 40 is smaller than the depth of the projecting member fixing recess 20. When the base 42 of the projecting member 40 is inserted into the molten resin P in the recess 20, the molten resin P surrounds the base 42 of the projecting member 40 and adheres to the fixing recess 20. This is because the 40 base portions 42 exhibit the anchor effect and are securely fixed to the extruded product 10. Further, the amount of the molten resin P injected into the projecting member fixing recess 20 is such that when the base 42 of the projecting member 40 is inserted into the projecting member fixing recess 20, the base 42 of the projecting member 40 is surrounded. An amount that fills the recess 20 is preferable.
[0022]
Next, as shown in FIG. 2 (2-D), the design surface side split mold 31 and the back side split mold 35 are closed to press the extruded product 10. By this pressing, the resin on the design surface 14 side is pushed into the shaping space 15 at the back surface removal portion 13 of the extruded product 10 and deforms, and fills the shaping space 15 and is shaped into a mold surface shape. A desired terminal portion 11 is formed. On the other hand, the projecting member 40 held on the mold surface 37 of the back surface side split mold 35 is a base 42 of the projecting member 40 projecting from the mold surface 37 of the back surface side split mold 35 by the closing of the press die 30. Is inserted into the molten resin P in the protruding member fixing recess 20 on the back surface 12 of the extruded product 10, and the molten resin P surrounding the base portion 42 of the protruding member 40 is cured on the back surface of the extruded product 10. Fixed.
[0023]
After the extrusion-molded product 10 is cooled, if the press is released and the molded product is taken out, a molding having a desired terminal portion shape and having a protruding member firmly fixed to the back surface in the vicinity of the terminal portion is obtained.
[0024]
Next, other embodiments will be described. In the above embodiment, the protruding member fixing recess 20 is formed on the back surface of the extruded product 10 during the back surface processing step. However, depending on the back surface shape of the extruded product, the protruding member fixing recess 20 may be formed. It may not be necessary to form it. For example, the case where it has the groove | channel 101 formed at the time of extrusion molding on the back surface of an extrusion molded product along a longitudinal direction like the extrusion molded product 100 shown to the (3-A) figure of FIG. 3 is mentioned. (3-B) The figure shows a state where the back surface required portion is removed by the back surface processing step and the shaping space 115 is formed. Reference numeral 113 denotes a back surface removing portion where the shaping space 115 is formed, 116 denotes a general portion, and 117 denotes a general portion back surface.
[0025]
4 is used for the extruded product 100 in which the groove 101 is formed on the back surface, and the groove 101 is located at a position corresponding to the groove 101 on the mold surface. A protruding ridge 121 is formed, the middle of the protruding ridge 121 is cut out to form a flat mold surface 122, and a protruding member holding recess 128 is formed in the flat mold surface 122.
[0026]
In the protruding member holding step, the same protruding member 40 as that of the embodiment shown in FIGS. 1 and 2 is inserted and held in the protruding member holding recess 128. Thereafter, the heat softening step is performed, and in the subsequent resin pouring / pressing step, as shown in FIG. 5, the molten resin P is inserted into the groove 101 of the extruded product 100 located on the mold surface of the design surface side split die 130 of the press die. Inject the required amount. This injection position is a position that matches the projecting member 40 held by the back side split mold 120. Next, the back surface side split mold 120 and the design surface side split mold 130 are brought close to each other, and the extruded product 100 is pressed to obtain a desired molding.
[0027]
Further, in each of the above-described embodiments, the case where the protruding member is provided on the back surface of the general portion of the molding has been shown. However, in the present invention, the protruding member is provided on the shape changing portion, that is, the back surface removing portion of the molded product You may do it. FIG. 6 is a cross-sectional view showing a resin / injection press process in the embodiment in that case. In this embodiment, a projecting member is formed on the mold surface of the back side split mold 220 of the press die at a position corresponding to the shaping space 215 of the back side removal portion 213 of the extruded product 200 formed by the back side processing step. A holding recess 228 is formed, and the protruding member 40 is held in the protruding member holding recess 228. Then, during the resin injection / pressing step after the back surface processing step and the heat softening step, the molten resin P is injected into the portion corresponding to the protruding member 40 in the shaping space 215, and the back side split mold 220 and the design The extruded product 200 is pressed by bringing the surface side split mold 230 close to each other. Thereby, the back surface removal portion 213 of the extruded product 200 is shaped, and the protruding member 40 is fixed to the back surface of the back surface removal portion 213 with the cured resin of the molten resin P to obtain a desired molding.
[0028]
【The invention's effect】
As shown and described above, according to the molding method of the present invention, since a molding member having a desired shape change portion can be molded simultaneously with a projecting member such as a mounting clip or positioning component on the molding back surface, Excellent workability. Moreover, unlike the case of injection molding, the shape change portion has no unsightly boundary line and has a very good appearance. Further, the base portion of the protruding member is firmly fixed to the extruded product by a resin that surrounds and hardens the base portion of the protruding member. Further, if the base of the projecting member is larger than the shaft of the projecting member, the projecting member exerts an anchor effect on the cured resin surrounding the base of the projecting member. Since it becomes very large and is fixed by the anchor effect, the material of the protruding member is not limited.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a back surface processing step in an embodiment of the present invention.
FIG. 2 is a sectional view showing a process from a clip holding process to a pressing process in the same example.
FIG. 3 is a perspective view showing a back surface processing step for an extrusion-molded product according to another embodiment.
4 is a perspective view showing a rear surface side split mold surface used in the embodiment of FIG. 3; FIG.
5 is a cross-sectional view showing a resin injection / pressing process in the same embodiment as FIG. 3;
FIG. 6 is a cross-sectional view showing a resin injection / press process in still another embodiment.
FIG. 7 is a cross-sectional view of an embodiment of a positioning member.
FIG. 8 is a side view of an automobile with a molding attached.
9 is an enlarged cross-sectional view of a portion A in FIG.
FIG. 10 is a cross-sectional view showing molding of a molding by conventional injection molding.
FIG. 11 is a cross-sectional view showing molding of a molding by conventional high-frequency heating.
[Explanation of symbols]
10 Extruded product 11 Required part (terminal part) of extruded product
12 Back surface of a required portion of an extruded product 13 Back surface removing portion 14 of an extruded product Design surface 15 of an extruded product 15 Shape forming space 16 General portion of an extruded product 17 Back surface of a general portion of an extruded product 20 For fixing a protruding member Recess 30 Press mold 31 Design surface side split mold 32 Design surface side split mold back surface removal part mold surface 33 Design surface side split mold general part mold surface 35 Back surface side split mold 36 Back surface side split mold back surface removal part Mold surface 37 Mold surface 38 for the general part of the back side divided mold Projecting member fixing recess 40 Projecting member 42 Projecting member base P Molten resin

Claims (4)

A back surface processing step of removing a required amount of the back surface of the required part of the extruded product to form a shaping space on the back surface; and
In contrast to a press die composed of a design surface side split mold for shaping the design surface side of the extruded product and a back surface side split mold for shaping the back surface side, a clip, a positioning part, etc. on the mold surface of the back side split mold A projecting member holding step of detachably holding the projecting member and projecting the base of the projecting member toward the design surface side split mold,
A heating and softening step of heating and softening a back surface removal portion of the extruded product;
After a required amount of molten resin is injected into the back surface of the extruded product corresponding to the position of the projecting member, the extruded product is pressed with a press die to shape the back surface removal portion and the projecting member is made of the extruded product. Resin injection / pressing process to fix to the back side,
The molding method characterized by including these. 2. The molding method according to claim 1, wherein a forming member forming recess is formed on the back surface of the general part of the extruded product together with forming the shaping space during the back surface processing step. The die of the back side split mold according to claim 1, wherein the mold has a groove formed at the time of extrusion molding of the extruded product along the back surface longitudinal direction of the extruded product, and the projecting member corresponds to the groove at the projecting member holding step. Removably held on the surface, molten resin is injected into the required portion of the groove corresponding to the protruding member during the resin injection / pressing process, and the back surface removal portion is shaped by pressing with a press die and the protruding member is inserted into the groove A molding method for forming a molding, characterized in that: 2. The shaping space according to claim 1, wherein the projecting member is detachably held on the mold surface of the back-side split mold corresponding to the shaping space during the projecting member holding step, and the shaping space corresponding to the projecting member during the resin injection / pressing step. A molding method characterized by injecting a molten resin into a required portion of the mold, shaping the back surface removal portion with a press using a press die, and fixing the protruding member to the back side of the back surface removal portion.

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