JPH0649293B2 - Terminal processing method in insert molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is characterized in that when a decorative material such as fabric or leather is partially insert-molded on the surface of a resin molded product, the end portion of the decorative material is made of resin. The present invention relates to a method of treating a molded product at the same time as molding.

[Conventional technology]

2. Description of the Related Art Conventionally, resin molded products used as interior parts of automobiles are molded with synthetic resin materials such as ABS resin, polypropylene resin, AS resin, etc., and generally, resin molded products are often used as they are. However, due to the recent trend toward higher designs, it has become necessary to partially provide a decorative material such as fabric or leather on the surface of a resin molded product for decoration.

Then, in the method of molding the decorative material at that time, a method in which the resin molded product is used as a base material and the decorative material is molded on the whole by vacuum molding, or when the resin molded product is partially molded in the molding die An insert molding method of setting and molding a decorative material is performed.

[Problems to be solved by the invention]

However, in the former molding method, although it is suitable for covering the entire resin molded product with the decorative material,
There is a problem that the forming work is complicated when the decorative material is partially provided. Further, in the latter molding method, the synthetic resin material filled in the molding die at the time of molding of the resin molded product wraps around the end portion of the decorative material, and the decorative material at that portion rolls up to cause a defective appearance. In addition to the occurrence, there is a problem that the decorative material processed as a separate product must be attached in a post process due to the shape restriction of the resin molded product.

Therefore, the present invention has been made in order to solve the above-mentioned problems, and the insert wall that individually protrudes at the time of molding is advanced and retracted in the mold of the portion located at the end of the decorative material set in the mold. By providing as much as possible, it is possible to facilitate the molding operation of the decorative material and prevent the appearance defect from occurring at the end portion of the decorative material.

[Means for solving problems]

That is, the terminal treatment method in the insert molding according to the present invention is a molding of a portion located at the terminal portion of the decorative material set in the molding die in partially insert-molding the decorative material on the surface of the resin molded product. The mold is provided with insert walls that can be projected and retracted individually, and the insert wall is projected toward the resin molded product side before the resin molded product comes into contact with the molding die near the insertion wall, and at the projecting portion. Bending the end of the decorative material to the resin molded product side, and then molding the insertion wall so that a part of the resin molded product covers it, and withdrawing from the resin molded product by retracting the insertion wall in the molding process,
Both sides of the bent end of the decorative material are sandwiched between resin molded products and covered.

[Action]

In such a terminal treatment method in insert molding,
When processing the end portion of the decorative material molded on a part of the resin molded product, the decorative material is set on a predetermined portion of the molding surface of the molding die, and then the decorative material is adsorbed and fixed. At this time, when the molding method is blow molding or compression molding, a synthetic resin material which is a molding material is set on the molding surface side, and the molding die is clamped to start molding. Further, at the time of injection molding, the mold is clamped and a synthetic resin as a molding material is injected onto the molding surface.

Immediately before the start of molding, the insertion wall is projected toward the molding surface side, and the protruding portion is bent at the end of the decorating material toward the synthetic resin side which is the molding material. At that time, as the molding progresses, the synthetic resin is molded so as to cover the protruding insertion wall and the decoration material around the terminal, and the synthetic resin is blocked by the insertion wall and penetrates into the bent portion of the decoration material. Can be disturbed. As a result, the parting portion of the decorative material is molded cleanly. In addition, since the decorative material is fixed by vacuuming during molding, the synthetic resin comes closer to the molding surface before other parts, so the center of the decorative material contacts the end toward the end, Synthetic resin is covered without entrapment or deformation.

Then, the insertion wall is retracted from the molding surface in a state where the surface layer portion of the synthetic resin in contact with the molding surface is cooled and the shape is maintained to some extent. As a result, the synthetic resin further fills the gap between the bent portion of the decorative material and the end portion.

Then, when the resin molded product is molded, the end of the decorative material is bent in the synthetic resin at a substantially right angle, and is molded into a shape sandwiched between the synthetic resins on both sides.

〔Example〕

Hereinafter, a terminal treatment method in insert molding according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a partially enlarged cross-sectional view of a terminal treatment device in insert molding according to the present invention.

In FIG. 1, reference numeral 1 denotes one of the molds used for blow molding, one surface of the mold 1 is a molding surface 1a and the other surface is an outer surface 1b of the molding die 1. . Further, the other molding die (not shown) formed in the same shape is disposed on the molding surface 1a side of this molding die 1, and both molds are clamped at the time of molding so that the molding space 2 is formed. To be formed. The parison Ma made of synthetic resin is arranged in the molding space 2 before the molds are clamped.

A plurality of suction holes 3 opened to the molding surface 1a are formed in one molding die 1, and the molding surface 1a side which is the tip of each suction hole 3 has a small diameter. Further, the outer surface 1b side which is the rear end of each suction hole 3 is connected to one suction passage 4 and is connected to a suction pipe 6 leading to a vacuum pump 5. The decorating material Mb such as fabric or leather is set on the molding surface 1a in which the suction holes 3 are formed, and the decorating material Mb is attracted and fixed by operating the vacuum pump 5. .

Further, in the molding die 1 near the end portion Mc of the decorative material Mb, insertion grooves 7 penetrating from the outer surface 1b toward the molding surface 1a are formed in some places, and the molding surface 1a side inside thereof is formed. Each of the insertion walls 8 is adapted to project to the molding surface 1a side of the molding die 1. Further, a bar member 9 partially protruding to the outer surface 1b side is fixed to the insertion groove 7, and a movable die plate 10 is fixed to the rear end thereof.

Then, when the movable die plate 10 advances toward the molding die 1 side, a part of the insertion wall 8 projects to the molding surface 1a, and the molding surface 1a
The end portion Mc of the decorative material Mb adsorbed on the and the vicinity thereof are bent to the parison Ma side, and when the movable die plate 10 is retracted from the forming die 1, the protruding portion of the insertion wall 8 is formed on the forming surface. It is designed to immerse up to 1a.

Next, a terminal processing method of the decorative material Mb using the terminal processing device configured as described above will be described.

FIG. 2 is a process diagram for explaining the terminal treatment method in the insert molding method according to the present invention, and FIG. 3 is a sectional view of a resin molded product obtained by the terminal treatment method of FIG.

As shown in FIG. 2 (a), after the decorative material Mb is set on a predetermined portion of the molding surface 1a of the molding die 1, the vacuum pump 5 is operated to adsorb and fix the decorative material Mb. Next, a parison Ma made of a synthetic resin material is formed on the molding surface 1a side of the molding die 1.
Is set, the other mold (not shown) is clamped, and air W is supplied into the parison Ma to start molding.

Immediately before the start of molding, the movable die plate 10 is actuated to advance to the molding die 1 side, and the tip of the insertion wall 8 provided at the tip of the rod member 9 is projected to the molding surface 1a side of the molding die 1. Then, the tip portion Mc of the decorative material Mb and its periphery are bent toward the parison Ma at the protruding portion.

At this time, as the molding proceeds, as shown in FIG. 2B, the parison Ma is formed so as to cover the protruding insertion wall 8 and the end portion Mc of the decorative material Mb. At this time, as shown in FIG. 2 (c), the bent portion Md of the parison Ma that has wrapped around is blocked by the insertion wall 8 to prevent the decorative material Mb from entering the bent portion Me. As a result, the parting portion of the decorative material is molded cleanly.

Further, in the molding process, since the molding surface 1a of the decorative material Mb is fixed by vacuuming, the parison Ma approaches the molding surface 1a before other parts, so that the end portion Mc of the decorative material Mb is The parison Ma hangs over without touching the terminal Mc, winding the terminal Mc, or deforming it.

Then, with the surface layer portion of the parison Ma in contact with the molding surface 1a of the molding die 1 being cooled so that the shape is maintained to some extent, the movable die plate 10 is mounted as shown in FIG. 2 (d). In reverse, the mold 1 is retracted in the opposite direction to retract the protruding portion of the insertion wall 8 provided at the tip of the rod member 9. As a result, the bent portion Md of the parison Ma further fills the gap between the tip portion Mc of the decorative material Mb and the bent portion Me.

At the same time when the molding is completed, the other molding die is opened to take out the resin molded product M held on the molding surface 1a. As a result, as shown in FIG. 3, the end portion Mc of the decorative material Mb is bent substantially at a right angle, and is formed in a shape sandwiched by the parison Ma on both sides.

In this blow molding, the decoration material Mb is used in the softened state of the parison Ma.
Since the joining is performed in a state where the terminal portion Me and the periphery thereof are held together, in the case of the decorative material Mb such as a fabric, the joining is obtained by biting the resin into the fabric, but depending on the type of the decorative material Mb. It may not be possible to obtain a desired bonding strength, and in such a case, an adhesive such as a hot melt film may be provided on the parison side of the decorative material Mb for molding.

It should be noted that in this embodiment, the molding was performed by blow molding, but the present invention is not limited to this embodiment, and for example, a method of molding at a relatively low pressure such as compression molding or low foam injection molding. It can also be applied to. At that time, when performing compression molding, after placing the heated decoration material on the molding die, the insertion wall is projected from the lower side to the molding surface, the insertion wall is retracted as the mold is clamped, and the tip is slightly moved. It is good to mold in a protruding state. Further, in the case of injection molding, the temperature of the molding die may be raised by 20 to 30 ° C. as compared with general molding, and the insertion wall may be projected onto the molding surface immediately before the completion of injection molding.

〔The invention's effect〕

As described above, in the terminal treatment method in insert molding according to the present invention, the insert wall that individually protrudes during molding is advanced and retracted in the mold of the portion located at the end of the decorative material set in the mold. Since it is possible to provide, it is possible to insert the end portion of the decorative material into the base material of the resin molded product at the same time as molding, and it is possible to prevent the appearance defect from occurring at the end portion of the decorative material. .

Further, in the present invention, since the end portion of the decorative material can be covered with the base material of the resin molded product, peeling of the decorative material can be prevented.

Further, in the present invention, since it is only necessary to cut into a predetermined shape as a pre-processing of the decorative material provided on the resin molded product, it is possible to easily perform the molding operation of the decorative material and to simplify it. There is an effect that can be.

Further, in the present invention, if a foam material or the like is laminated on the decorative material in advance and molded, it is possible to partially give a soft feeling, and there is an effect that it can have different designability as a skin material. .

[Brief description of drawings]

FIG. 1 is a partially enlarged cross-sectional view of a terminal treatment device that can be used in insert molding according to the present invention. FIG. 2 is a process drawing for explaining a terminal treatment method in insert molding according to the present invention. FIG. 3 is a sectional view of a resin-formed product obtained by the terminal treatment method of FIG. 1 ... Mold 2 ... Molding space 3 ... Suction hole 4 ... Suction path 5 ... Vacuum pump 6 ... Suction tube 7 ... Insertion groove 8 ... Insertion wall 9 ... Rod member 10 ... Movable Die plate M …… Resin molded product Ma …… Parison Mb …… Decorative material Mc …… Terminal part

Claims (1)

[Claims] 1. When insert-molding a decorating material partially on the surface of a resin molded product, the decorating material set in the molding die can be individually projected and retracted into a molding die located at an end portion of the decorating material. An insertion wall is provided, and the insertion wall is projected toward the resin molded product side before the resin molded product comes into contact with a molding die near the insertion wall, and the end of the decorative material is a resin molded product at the protruding portion. Bending to the side, and then molding with the insertion wall partially covered with the resin molded product, and retracting the insertion wall in the molding process and pulling it out of the resin molded product. A terminal treatment method in insert molding, characterized in that both sides are sandwiched and covered with a resin molded product.