KR100268836B1 - Insert molding of one body type and making method thereof - Google Patents

Abstract

PURPOSE: A method for manufacturing an integral type varying insert molding and molding party are provided to make the molding as one body type by pressing forming and insert extrusion processes instead of assembling a number of parts. CONSTITUTION: First, adhesive is coated on one side of a stainless coil and a surface protecting tape is attached on the other side of the stainless coil, which is formed into a press form(12). Then, both edges of the formed stainless coil are lightly bent by a press forming step. Next, polypropylene resin and clips are attached to an inner surface of the stainless coil by a primary insert extrusion process. Then, polypropylene resin is attached to both edges of the stainless coil by a secondary insert extrusion process. Finally, one body type molding(20) is made by a final machining process.

Description

Manufacturing method and molding part of integrated variable insert molding {INSERT MOLDING OF ONE BODY TYPE AND MAKING METHOD THEREOF}

The present invention relates to a molding that is coupled to the rim of an upper body of a door of a vehicle, and more specifically, to a molding injection molding method of a conventional molding part made by assembling a molded part using various methods such as roll forming and press insert molding. The present invention relates to a method of manufacturing a molding in one piece by uniting the same, and a molding part thereof.

As shown in FIG. 1, the upper part of the side door of the automobile is a component used to prevent leakage and wind noise and to improve the appearance of the vehicle by filling a gap between the vehicle body and the door of the automobile, and molding the automobile. The two components, DRIP RAIL MOLDING (1) and REAR PIECE DRIP RAIL MOLDING (2), are manufactured separately and assembled into a vehicle.

The drip rail molding 1 is manufactured by going through 27 kinds of processes, and a schematic process sequence is as follows (see FIGS. 2 and 3).

Adhesive bonding to one side of stainless coil for adhesion with PVC → Drying → Roll molding to form stainless coil (3) molding shape in 12 steps → Extrusion of PVC (4) to the rolled stainless coil (3) molding surface → Cooling → Cutting with a certain length of molding → Stretch bending into the shape of the side frame of the vehicle body for mounting on the vehicle → Pressing (Cutting the front end → Cutting the angle of the end → Notching → Cutting the rear end) → Rear piece drip rail molding High speed saw blade cutting at the end of assembly → Adhesive bonding of injection part to finish the whole end of the vehicle → Injection of PVC (4) insert into the injection part at the end → Assembling with the car body on the inner side of the drip rail molding (1) It is manufactured in the order of the assembly of the clip 5 (the clip is injection molded and then processed and assembled in a drip rail molding after separate manufacture).

In order to mount the drip rail molding thus manufactured to the body frame 6, a separate drip rail 7 is manufactured and attached to the body frame by spot welding or the like, but the conventional drip rail molding 1 is rolled. Since the drip rail 7 is manufactured by the forming and extrusion process, it is necessary for the assembly of the drip rail molding and is included in the vehicle body manufacturing process.

In addition, the rear piece drip rail molding 2 is manufactured while undergoing about 21 processes, and a schematic process sequence is as follows (see FIGS. 4 and 5).

Press molding (8) of stainless coil (8) into molding shape → Attach protective tape to molding surface of stainless coil (8) (Prevent surface scratches during movement) → Ultrasonic cleaning of molding surface after removing protective tape → Drying → Adhesive bonding to the molding surface to facilitate bonding with the stainless coil 8 when injecting PVC (9) → Secondary bonding to enhance bonding strength → Drying → High frequency with high frequency preheater to preheat the adhesive Preheating → Injection molding of PVC (9) on the molding surface → Removing and finishing unnecessary injection gate → Attaching the protective tape → Assembling the clip (10) using the assembly jig → Spot spot welding for drip rail molding and assembly It is prepared in the order of.

The rear piece drip rail molding is mounted on the body frame while the clip 10 attached to the inner surface of the rear piece drip rail molding 2 manufactured as described above is inserted into a pre-formed hole formed in the body frame 6. Done.

However, in the method of manufacturing such a molding, it is conventionally dualized into press insert molding and roll forming molding, and its method is complicated and diverse, so that the manufacturing cost is increased, as well as the gap generated from the joints between the components when mounted on a vehicle. Wind noise was generated and defects in appearance were observed, and there was a high possibility of foreign substances being caught in the gap during washing (particularly during automatic washing).

In addition, the drip rail molding is manufactured by rolling a stainless coil and extruding PVC on its surface, but the rear piece drip rail molding is manufactured by press molding a stainless coil and injecting PVC onto the surface thereof, thereby forming the stainless coil. The color of the molding surface was changed due to the difference in the method and the difference of PVC raw materials.

In addition, in order to assemble the drip rail molding in the vehicle body frame, an additional inconvenience is that a separate drip rail must be mounted on the vehicle body frame by spot welding.

The present invention has been made to solve the problems described above, a method for manufacturing a molded part made by assembling a plurality of parts manufactured by various methods integrally by press molding and insert injection and produced by this To provide integrated molding.

1 is an installation state diagram of a side door upper molding of a conventional vehicle,

2 is a cross-sectional view taken along line A-A of FIG.

3 is a view showing only a stainless coil portion in FIG.

4 is a cross-sectional view taken along line B-B of FIG. 1;

Figure 5 is a view showing only the stainless coil portion in Figure 4,

6 is an installation state diagram of the side door upper molding of the vehicle according to the present invention,

7 is a cross-sectional view taken along line A-A of FIG.

8 is a view showing only a stainless coil portion in Figure 6, Figure 9 is a longitudinal cross-sectional view of the molded part.

(Explanation of reference numerals)

1 ... drip rail molding, 2 ... rear piece drip rail molding,

5,10,16 ... clip, 6,19 ... body frame,

7 ... drip rail, 3,8,11 ... stainless steel coil,

4,9 ... PVC, 14 ... polyfluoropropylene resin,

17 ... polyflohylene resin, 20 ... integral molding.

Hereinafter, with reference to the drawings will be described in detail the configuration and operation of the integral variable insert molding according to the present invention.

As shown in FIG. 6, the molding is integrally manufactured to be mounted on a vehicle. The manufacturing method is as follows (see FIGS. 6 and 7, 8 and 9).

On one side, an adhesive is applied in advance, and on the other side, a stainless coil 11 having a surface protection tape is press-molded (see Fig. 7) into the overall shape (one piece) of the molding. It is a blanking process of general press. → slightly bend (13) both edges of the stainless steel coil (11) which is flat pressed. It refers to a general press forming process → After the stainless coil (11) coated with the adhesive is seated on an injection mold, the first insert injection molding (15) is carried out with a polyflofilene resin (14) on the inner side, and the clip ( 16) is also shaped on the injection mold to be integrally molded at the same time.

At this time, the shape of the clip is formed by using a working core of a general injection mold (SLIDE CORE), and the adhesion of the stainless coil 11 and the polyflophylene resin 14 is performed by injection molding the temperature of the material (polyflophylene resin). (About 200 ° C to 240 ° C), the bond on the inner side of the stainless coil melts and adheres to the injection material.

In addition, the material used here contains the thing which GLASS FIBER (glass fiber) and TALC (talc) contained in polyflopylene resin, or the thing in which ELASTOMER (natural, synthetic rubber) etc. were contained in polyflopylene resin. (See Fig. 8) → The first injection molded product 14 on one side is seated on the second injection mold (INSERT) and then the second injection molding (18).

In this case, polyflothylene resin, which is the same series as the primary molding material, is used as the molding material. In general, materials of the same series (here, a combination of polyflophylene resin and polyflophylene resin) can be easily adhered by injection heat. This is because the adhesive strength is strong even without a separate bonding. (See FIG. 9) → The integral molding 20 is manufactured in the order of finishing by finishing and processing.

Due to the characteristics of the product, the material used for the first injection should be hard, so use polypropylene resin as resin to add strength reinforcing materials such as glass fiber, and use it for the second injection molding. The material should be soft and soft to the touch. Therefore, polypropylene resin is used as resin and natural or synthetic rubber is added.

Therefore, in the integral molding according to the present invention, the polyflophylene resin 14 having a plurality of clips 16 integrally formed on the front surface in one longitudinal direction on one side of the stainless steel coil 11 having both edges slightly bent (press forming). The layer is covered, and is formed in a shape such that both the edges of the polyflohylene resin layer and the stainless coil 11 or another polyflophylene resin 17 layer is covered on the front surface except for the stainless coil to be exposed. The clip 16 is inserted into a plurality of holes 21 formed in advance in the 19 to mount the integrated molding 20 to the vehicle body frame.

Therefore, when the integral molding is manufactured in the above-described manner, the whole molding can be composed of one piece, and the manufacturing method is also simplified to press molding and insert injection. It is possible to form an integral molding by the press molding and insert injection, without having to configure separately and assemble to the molding.

The integrated variable insert molding consisting of the above objects and configurations can be manufactured as a single piece in which the parts previously produced in several pieces (two pieces or more) are integrated, thus simplifying the process (roll forming, multiple bonding). Process, extrusion molding, drip rail fabrication and welding of the vehicle body, elimination of the process such as clip injection molding and assembly) and the appearance is improved.

In addition, by integrating an assembly clip for assembling the molding into the vehicle body, the molding can be prevented from being easily detached after assembly, and manufactured by a binary process (roll forming molding, press molding, extrusion molding, injection molding, etc.). Therefore, problems such as color dissimilarity (異色) between each of the pieces generated when assembling conventional moldings consisting of two or more pieces, assembly steps, and the like can be improved by manufacturing them in one piece and in a single method.

Claims (3)

A method of manufacturing a molding for mounting on a door upper frame of a vehicle, Press molding 12 a stainless coil 11 having an adhesive applied to one side and a surface protection tape attached thereto on the other side (press blanking); Slightly bending (13) both edges of the press-formed stainless coil 11 (press forming process); Injection molding 15 of the first insert into the polyflohylene resin 14 on the inner surface of the stainless coil 11 to which the adhesive is applied, but simultaneously forming the clips 16 integrally; Performing secondary insert injection molding (18) with polyfluoropropylene resin (17) on both edges of the stainless coil (11) to which polyfluoropropylene resin (14) is attached on one side primarily; An integrated variable insert molding manufacturing method, characterized in that it comprises the step of finishing by finishing and processing to manufacture the integral molding (20). In the molding mounted on the door upper frame of the vehicle, A stainless steel coil 11 having an adhesive on one side and a surface protective tape on the other is press-formed 12 into the overall shape of the molding (press blanking), and both sides of the press-formed stainless coil 11 are pressed. Bend the edge slightly (13) (press forming process), and the primary insert injection molding (15) with polyfluoropropylene resin (14) on the inner surface of the stainless coil (11) to which the adhesive is applied, but also the clip (16) Simultaneously molding integrally, secondary insert injection molding (18) with polyfluoropropylene resin (17) on both edges of the stainless steel coil (11) with polyfluoropropylene resin (14) attached to one side first, and Integral variable insert molding part, characterized in that the finish is formed by forming an integral molding (20). The method of claim 3, wherein An integrally variable insert molding component, characterized in that the integral molding (20) is mounted to the vehicle body frame while the clip (16) is inserted into a plurality of holes (21) previously formed in the vehicle body frame (19).