JPH0511754B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a side molding for an automobile, and in particular to a method for manufacturing a side molding for an automobile that integrates a main body portion forming a design portion and an insert. be.

[Prior Art] A conventional automobile side molding consisting of a main body forming a design part, a base covered with an insert, and a double-sided adhesive tape was developed by the Japanese Patent Publication Publication No. 51
There are techniques described in JP-A-21492 and JP-A-60-99633.

In other words, when extruding an insert integrally with a main body part that becomes a decorative part and a design part that elastically absorbs external forces, first, the main body part which becomes a design part and the insert are simultaneously extruded separately, and after extrusion, the design of both The insert was integrated with the main body before it was cured.

In the automobile side molding formed in this way, the resin such as vinyl chloride resin (hereinafter simply referred to as PVC) forming the main body part, which is the design part, is
Insert materials with smaller expansion and contraction than PVC, such as aluminum plates, are used to prevent the variation in expansion and contraction of about 6 [mm] when the length of the main body, which is the design part, is 1000 [mm]. By suppressing this with steel plates, etc., the expansion and contraction of the finished automobile side molding was reduced, and the variation in shrinkage after molding was reduced and dimensional accuracy was increased.

[Problems to be solved by the invention] However, the above-mentioned conventional side molding for automobiles has the following problems:
Since the PVC that forms the main body, which is the design part, and the aluminum plate that is the insert material were to be integrated, completely different materials were to be integrated after molding. Therefore, the quality of the finished product depends on the temperature of the extruded main body, which is the design part, and the temperature of the aluminum plate, which is the insert material. Although the quality of the product can be maintained, it is predicted that if the temperature of the molded product immediately after extrusion or the extrusion temperature changes, the main body, which is the design part, and the aluminum plate of the insert material may not be well integrated. be done.

Furthermore, since the insert material is integrated with the PVC that forms the main body part, which is the design part, it is used in a state where there is inherent thermal distortion, and linear expansion due to environmental temperature changes and sidewalls of the car body. It is also predicted that it may not be possible to reduce the variation in overall dimensions due to elongation during pasting.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method of manufacturing a side molding for an automobile in which the variation in overall dimensions is reduced.

[Means for Solving the Problems] The method for manufacturing a side molding for an automobile according to the present invention includes a main body forming step of molding a resin main body forming a design portion, and a cooling step for cooling the main body; an insert forming step for forming a resin coating on the insert in parallel with the main body forming step and the cooling step; and an insert cooling step for cooling the resin-coated insert formed in the insert forming step. a heating step of heating the resin main body cooled in both of the cooling steps and the opposite surface of the resin coating of the insert made of the same material as the main body; A side molding for an automobile is formed by a joining process in which the resin coating of the insert made of the same material as the main body part is integrated by pressure welding to the opposing surface of the insert side.

[Function] In the method for manufacturing a side molding for an automobile according to the present invention, in the main body forming step, a resin main body forming a design part is molded using an extrusion molding machine or an injection molding machine. Then, in the cooling step, the main body formed in the main body forming step is cooled to about room temperature or below. At the same time, the resin-coated insert formed in the insert forming step of forming a resin coating on the insert in parallel with the main body forming step and the cooling step is cooled in an insert cooling step. Next, the lower surface of the resin main body cooled in both of the cooling steps and the opposite surface of the resin coating of the insert made of the same material as the main body are heated in a heating step to bring them into a molten state. Furthermore, in the joining process, an insert made of the same type of material as the main body, which has been melted in the heating process, is placed on the lower surface of the resin main body which has been melted in the heating process. The resin coating is pressed and integrated.

In this way, in both cooling processes, the resin coating of the main body molded in the main body forming process and the insert molded in the insert forming process is cooled, and then heated again in the heating process, so the main body and the resin coating are cooled. The insert can be joined to the main body while the cooling temperature of the coated insert is uniform, and expansion and contraction can be reduced in response to the environmental temperature.
As a result, variations in overall dimensions are reduced.

[Example] FIG. 1 is a sectional view showing an automobile side molding molded by an example of the method for manufacturing an automobile side molding of the present invention. Moreover, FIG. 2 is a partial plan view showing an example of an insert used in the method for manufacturing a side molding for an automobile according to this embodiment.

In FIG. 1, the main body 1 is made of resin, usually PVC, with a design part formed by extrusion molding.
It is attached to the surface of a car body to provide decoration and elastic absorption of external forces. Further, both sides of the insert 2 made of a thin aluminum plate are covered with the same material as the main body 1, that is, the same PVC or PVC-based material, and the upper layer 3a of PVC on the main body 1 side and the opposite side of the main body 1. The insert structure 4 is formed by the side PVC lower layer 3b.

The insert structure 4 has a main body 1 made of PVC and an insert 2, both of which are covered with an upper layer 3a and a lower layer 3b made of PVC.The main body 1 is cooled after extrusion molding, and then heated again to a semi-molten state. By applying contact pressure between them, the upper layer 3a of the upper surface of the insert 2 of the insert structure 4 is joined to the lower surface of the main body portion 1 and integrated.

Then, an insert structure 4 is attached to the lower surface of the main body 1.
After bonding the upper layer 3a on the upper surface, double-sided adhesive tapes 5 and 6 are attached to both sides of the insert structure 4 on the lower surface of the insert structure 4.

The automobile side molding of this embodiment configured as described above can be attached to a specific location on the automobile body as follows.

That is, the release papers 5a and 6a of the double-sided adhesive tapes 5 and 6 are removed, and the adhesive layers 5b and 6b of the double-sided adhesive tapes 5 and 6 are pressed onto the surface of the vehicle body, and the adhesive layers 5b and 6b are used to form the design area. formed
Glue the PVC main body part 1.

In addition, after adhering to the surface of the vehicle body, the body part 1 serving as the design part and the insert structure 4, in which both sides of the thin aluminum plate of the insert 2 are covered with PVC upper layers 3a and 3b, are well integrated.
Since the insert 2 restricts the expansion and contraction of the PVC of the main body 1, the expansion and contraction of the automobile side molding can be reduced.

By the way, the automobile side molding of the above embodiment includes a PVC main body part 1 in which a design part is formed by extrusion molding, and a PVC insert structure made of the same material as the main body part 1 in which an insert 2 is formed by extrusion molding. 4, and double-sided adhesive tape 5 attached to both sides of the lower surface of the PVC main body 1 forming the design part.
and 6, the PVC main body 1 and the PVC
After molding, the insert structure 4 is cooled once, and then reheated and integrated in a semi-molten state. However, when implementing the present invention,
The present invention is not limited to the above embodiments.

For example, the shape of the PVC main body part 1 with a design part formed by extrusion molding may be determined by taking into account the decoration and external force to be absorbed, etc., depending on the usage condition, and the shape may be determined by extrusion molding or injection molding. be able to. Furthermore, the material is not limited to PVC.

Then, the insert 2 is made of the same material as the main body 1, which is coated with PVC by extrusion molding.
In the PVC insert structure 4, the shape of the insert 2 is a continuous strip, but as illustrated in the partial plan view of the insert 2 in FIG. or a predetermined oval 2b as shown in Figure 2b.
and U-shaped 2c on both sides,
The insert 2 may have a hole penetrating from the surface to the bottom surface. This type of material can increase the bonding force between the synthetic resin covering the insert 2 and the insert 2 when they are integrated. Further, in particular, the one shown in FIG. 2b can be freely adapted to the bending of an automobile side molding. As another means for increasing the bonding strength between the insert 2 and the synthetic resin that covers the insert 2, the insert 2 may be extruded after being coated with an adhesive. Furthermore, the synthetic resin coating the insert 2 is an upper layer 3.
a and the lower layer 3b; however, when implementing the present invention, only the upper layer 3a may be used. Further, although the insert 2 is made of an aluminum thin plate, it can also be made of a steel thin plate or a stainless steel thin plate.

Furthermore, the main body part 1 molded from PVC and the insert structure 4 in which the upper layer 3a and the lower layer 3b are molded onto the insert 2 and coated with PVC may be molded independently or simultaneously.

Furthermore, the main body portion 1 and the insert structure 4
When integrating in a semi-molten state, usually
If they are in a semi-molten state, they can be firmly integrated, but if necessary, they may be integrated after applying an adhesive.

Next, a method of manufacturing this type of automobile side molding will be described.

Fig. 3 is a process diagram showing the main parts of an embodiment of the method for producing a side molding for an automobile according to the present invention, and Fig. 4 shows the main part of an extrusion head of an extrusion molding device used in the method for producing a side molding for an automobile according to the present invention. The cross-sectional view, FIG. 5, is a front view of the extrusion die of FIG. 4.

In Fig. 3, an insert 2 such as an aluminum thin plate sent out from a reel stand etc.
For example, it is degreased with a steam cleaner 11 using trichloroethane or the like, an adhesive is applied with a dip-type coater 12, and it is dried with a hot air dryer 13. The insert 2 coated with adhesive is then introduced into the extrusion molding device 14 .

The extrusion molding apparatus 14 has a structure as shown in the cross-sectional view of the main part of the extrusion head 20 in FIG.

That is, the extrusion head 20 includes a crosshead 21, a torpedo 22, an adapter 23, and an extrusion die 24 to form an extrusion path for molten PVC. The extrusion die 24 has an orifice 24a for the main body and an orifice 24b for the insert structure. The crosshead 21 and the adapter 23 and the adapter 23 and the extrusion die 24 are screwed together with fixing bolts 25 or 26. Further, the torpedo 22 is inserted into the crosshead 21, and its flange portion is held by a bag holder 27, which is further screwed onto the torpedo 22 with a fixing bolt 28. The torpedo 22 is an insert 2 introduced from the hot air dryer 13.
It has a transfer path 22a that sends the liquid to the extrusion die 24 side via the conveyance roller 30. Therefore,
Insert 2 introduced from hot air dryer 13
The material passes through the bag holder 27, the transfer path 22a of the torpedo 22, and the insert structure orifice 24b of the extrusion die 24, and is delivered from the extrusion molding device 14 to the separation roller 32 and the conveyance roller 33.

At this time, the insert 2 passing through the insert structure orifice 24b of the extrusion die 24 has the crosshead 21, torpedo 22, adapter 23
Then, the insert structure 4 is formed by molten PVC flowing through the extrusion channel formed by the extrusion die 24 to form an upper layer 3a on the upper side and a lower layer 3b on the lower side. At the same time, the main body orifice 24a of the extrusion die 24 forms the main body 1, which is adhered to the surface of the vehicle body and decorates and elastically absorbs external forces, using the molten PVC flowing through the extrusion channel.

The main body 1 formed by the main body orifice 24a of the extrusion die 24 maintains its shape.
It is guided to the cooling water tank 15A by the conveyance roller 31. In the cooling water tank 15A, the main body 1 formed by the main body orifice 24a of the extrusion die 24 is hardened. In addition, orifice 2 for the insert structure
4b is transferred to the cooling water tank 1 by the separating roller 32 and the conveying roller 33.
Guided by 5B. The insert structure 4 formed by the insert structure orifice 24b of the extrusion die 24 is hardened in the cooling water tank 15B.

The cured main body portion 1 and insert structure 4 are guided to the heating device 16 via the conveyance rollers 34 or 35. In the heating device 16, the lower surface of the main body 1 is heated by the upper heater 16a,
The lower surface is in a molten state including a semi-molten state up to a predetermined depth. Similarly, the lower heater 16b heats the upper surface of the insert structure 4 to bring it into a molten state, including a semi-molten state, up to a predetermined depth on the upper surface. In this way, the main body 1 whose lower surface is in a molten state and the insert structure 4 whose upper surface is in a molten state are transported by the pressing roller 36 and the receiving roller 37 installed at the conveyance position.
transported between.

The pressing roller 36 applies a pressing force in the direction of the receiving roller 37, and presses the main body part 1 in the direction of the receiving roller 37 from substantially the entire upper surface of the main body part 1. Further, the receiving roller 32 receives substantially the entire lower surface of the lower layer 3b of the lower surface of the coated insert structure 4. Therefore, when the opposing surfaces of the main body part 1 and the insert structure 4 are reheated and conveyed, they are pressed between the pressing roller 36 and the receiving roller 37, and the upper layer 3a of the upper surface of the insert structure 4 and The lower surface of the main body part 1,
They are joined and integrated by the pressing force of the pressing roller 36. At this time, the pressing roller 36 and the receiving roller 3
The main body part 1 and the insert structure 4 between 7 are thermally insulated, with the upper layer 3a on the upper surface of the insert structure 4 and the lower surface of the main body part 1 made of PVC in a molten state, and in a state where the heat capacities of the two are similar. Because they have the properties of physical objects, they can be reliably joined and integrated without using adhesives.

Next, after the main body part 1 and the insert structure 4 are integrated, the double-sided adhesive tapes 5 and 6 sent out from the reel stand 17 are attached to the joining rollers 38 and 39.
The double-sided adhesive tapes 5 and 6 and the lower surface of the main body 1 are bonded and integrated between the bonding rollers 38 and 39 by the adhesive layers 5b and 6b. The automotive molding, in which the main body 1 and the insert structure 4 are integrated and double-sided adhesive tapes 5 and 6 are attached to the lower surface of the main body 1, is moved to a predetermined place or place by means of a transport means (not shown) or the like. Transported to the process.

In this way, the manufacturing method of the automobile side molding of this embodiment involves forming the PVC main body part 1 which becomes the design part by extrusion molding, and inserting the insert 2 into the upper layer by extrusion molding and simultaneous extrusion of the PVC main body part 1. 3a
and the lower layer 3b to form the insert structure 4, which is placed in the cooling water tank 15A or the cooling water tank 15.
B to cool it to a normal temperature state, and then heat the heating device 16.
The main body portion 1 and the insert structure 4 are heated again by the upper heater 16a or the lower heater 16b to a molten state including a semi-molten state. those said above
The PVC main body 1 and the PVC insert structure 4 are pressed together in a molten state including a semi-molten state, and double-sided adhesive tapes 5 and 6 are attached to the integrated PVC insert structure 4. It is something to do.

Therefore, the method for manufacturing a side molding for an automobile according to this embodiment includes a body part forming step of molding the resin main body part 1 forming the design part and an insert forming process of molding the resin coating on the insert 2. A PVC insert structure 4 made of the same material as the main body part 1 is formed by covering the insert 2 by extrusion molding and simultaneous extrusion of the main body part 1. There is.
Then, in a cooling process, the main body part 1 molded in the main body part forming process and the resin-coated insert 2 molded in the insert forming process are cooled, and the resin main body part 1 and the main body part cooled in both the cooling processes are cooled. The opposite surface of the resin coating of insert 2 made of the same material as insert 1 is heated in a heating step. In the joining process, the resin coating of the insert 2 made of the same material as the main body part 1 is pressed against the opposing surface of the resin main body part 1 on the insert 2 side by the heating process and integrated. .

Therefore, since the insert structure 4 consisting of the main body part 1 and the resin-coated insert 2 is once cooled to about room temperature and then reheated and pressed in a molten state to be integrated, it is not possible to form the insert structure 4 by molding. Thermal strain that occurs between the main body 1 and the insert structure 4 can be removed by reheating, and the insert 2 can be joined with the history of the synthetic resin forming the main body 1 removed. Expansion and contraction can be reduced accordingly.

Since the main body part 1 and the insert structure 4 can be integrated by pressing together in a molten state including a semi-molten state, it is possible to continuously produce large quantities and to make the side molding for an automobile at a low price. can.
Further, the extrusion molding device 14, that is, the extrusion die 24 can be made into a single unit. Furthermore, since the main body portion 1 and the insert structure 4 are integrated by pressing under a molten state, no adhesive is required for integration. In addition, the thin aluminum plate, steel plate, stainless steel plate, etc. of the insert 2 suppresses changes in the main body part 1 due to temperature changes, reduces expansion and contraction of the finished automotive side molding, and reduces variation in shrinkage after molding. At the same time, dimensional accuracy can be improved.

In the manufacturing method of the automobile side molding of the above embodiment, the main body part 1 and the insert structure 4 are pressed together in a molten state by reheating, and then,
Double-sided adhesive tapes 5 and 6 are attached to both sides of the insert structure 4 of the main body 1, but when carrying out the present invention, the main body 1 and the insert structure 4 are pressed together in a molten state. After that, double-sided adhesive tapes 5 and 6 may be attached to the insert structure 4. Depending on the properties of the double-sided adhesive tapes 5 and 6, the main body 1 and the insert structure 4 may be pressed together in a semi-molten state and bonded together before passing through the cooling water tank. Alternatively, double-sided adhesive tapes 5 and 6 may be attached after cutting to a predetermined length.

The manufacturing method of the automobile side molding of the above embodiment includes the main body forming step of molding the resin main body 1 forming the design portion and the insert forming step of molding the resin coating on the insert 2. The main body part 1 is made of PVC and is made of the same material as the main body part 1, which is formed by covering the insert 2 by extrusion molding of the main body part 1 and simultaneous extrusion.
It forms an insert structure 4 of PVC. However, to achieve this kind of purpose it is also possible to use an insert construction 4 formed by covering the insert 2 with PVC.

That is, when carrying out the method for manufacturing a side molding for an automobile of the present invention, the main body part 1 formed in the main body part forming step and the main body part 1 formed in the main body part forming step are molded. an insert forming step in which a resin coating is formed on the insert 2 in parallel with the cooling step, and an insert cooling step in which the main body 1 formed in the main body forming step and the resin-coated insert 2 formed in the insert forming step are cooled. can do. Alternatively, the resin-coated insert 2 is molded independently of the main body forming step of molding the resin main body 1 forming the design portion and the cooling step of cooling the main body 1 molded in the main body forming step. Can be used.

By the way, the main body forming process of molding the resin main body forming the design part in the above embodiment was explained on the assumption that extrusion molding was used, but when carrying out the present invention, the resin main body forming process may be formed by injection molding. It is also possible to do this.

In addition, the cooling process of cooling the body part molded in the body part forming process of the above embodiment was explained using an example of cooling in a water tank, but when carrying out the present invention, the temperature of the molded synthetic resin is lowered to about room temperature. Any means to do so may suffice.

The heating step of heating the resin main body cooled in both cooling steps and the opposite surface of the resin coating of the insert made of the same material including the same material as the main body is explained in the case where a heater is used. ,
When carrying out the present invention, any known heating means such as a burner or hot air may be used as long as it can be heated directly or indirectly.

[Effects of the Invention] As described above, the automotive side molding of the present invention includes a cooling step of cooling the molded main body portion in the main body forming step of molding the resin main body portion forming the design portion, and a cooling step of cooling the molded main body portion. part forming step and the cooling step: an insert cooling step of cooling the resin-coated insert molded in the insert forming step of forming a resin coating on the insert, and a resin main body cooled in both of the cooling steps, and the main body. A heating step of heating the opposite surface of the resin coating of the insert made of the same type of material as the part, and a heating step of heating the opposite surface of the insert side of the resin main body part by the heating step.
It consists of a joining process in which the resin coating of the insert made of the same material as the main body is integrated by pressure welding.

Therefore, since the main body and the resin coating of the resin-coated insert are cooled in both cooling processes and then heated again in the heating process, the temperatures of the main body and the resin-coated insert during joining are Since the conditions can be kept constant and the two parts can be joined without temperature distortion, the resin-coated insert suppresses changes in the main body due to temperature changes, reduces expansion and contraction of automotive side moldings, and improves the quality of the molded automobile. It is possible to reduce variations in the length of side moldings and improve dimensional accuracy. In particular, since the main body and resin-coated insert are once cooled to room temperature, then reheated and pressed together in a molten state, thermal distortion of the main body caused by molding can be avoided. It can be removed by reheating, and the insert can be joined with the history of the synthetic resin that forms the main body removed, so expansion and contraction in response to environmental temperature can be reduced, and the entire body remains intact even when in use. Variations in dimensions can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a side molding for an automobile molded by an embodiment of the method for manufacturing a side molding for an automobile according to the present invention, and FIG. A partial plan view showing an example of an insert, FIG. 3 is a main part process diagram showing an example of the method for manufacturing an automobile side molding of the present invention, and FIG. 4 is a partial plan view showing an example of the method for manufacturing an automobile side molding of the present invention. FIG. 5 is a sectional view of the main part of the extrusion head of the extrusion molding apparatus, and FIG. 5 is a front view of the extrusion die shown in FIG. 4. In the figure, 1...Main body, 2...Insert, 4
... insert structure, 5, 6 ... double-sided adhesive tape,
15A, 15B...Cooling water tank, 16...Heating device, 3
6...pressing roller, 37...receiving roller. In addition,
In the drawings, the same reference numerals and symbols indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A main body forming step of molding a resin main body forming a design portion; A cooling step of cooling the main body formed in the main body forming step; The main body forming step and the above. an insert forming step in which a resin coating is formed on the insert in parallel with the cooling step; an insert cooling step in which the resin-coated insert molded in the insert forming step is cooled; a resin main body cooled in both of the cooling steps; a heating step of heating an opposite surface of the resin coating of the insert made of the same type of material as the main body; A method for manufacturing a side molding for an automobile, comprising a joining step of integrating a resin coating of an insert made of material by pressure welding.