JP4887084B2 - Method for producing hollow resin molded product with resin-plated parts, and hollow resin molded product - Google Patents

Description

  The present invention relates to a method of manufacturing a hollow resin molded product in which resin-plated parts plated on the surface are integrally attached, and the hollow resin molded product.

  In this specification, an outside door handle (hereinafter, simply referred to as “door handle”) constituting a door handle device of an automobile (vehicle) will be described as an example of a hollow resin molded product. Various types of door handle devices are attached to predetermined portions of the door of the vehicle so that the user can open the door. For example, when the user grips the door handle and pulls it to the near side, the door locking mechanism is released, and the door can be opened by causing the door handle to remain open.

  Since this type of door handle is visually recognized by the user, it is necessary to improve the appearance, and a part of the door handle may be plated. There is a door handle disclosed in Patent Document 1 as a plated door handle.

  Here, as the above-described door handle, there is a door handle body and a plating molding which are separately manufactured, and both are integrally assembled in a subsequent process. For example, in the conventional door handle H ′ shown in FIG. 8, the claw body 51 a of the plating molding 51 is inserted into the molding mounting portion of the door handle main body 52 and then fixed with the mounting screw 53. In the case of this door handle H ', the plating molding 51 is assembled to the molding mounting portion 52a of the door handle main body 52 via various fastening members (such as mounting screws 53 and double-sided tape). For this reason, many assembly steps are required. Further, when the door handle H 'is used (when the door of the vehicle is opened), the plating mall 51 may come off or a squeak noise may be generated.

  In order to prevent the above problems, it is assumed that the door handle main body and the plating molding are integrally formed by inserting a separately manufactured plating molding into the mold of the door handle main body. However, when the plating molding is molded by a normal injection molding method, since the pressure (holding pressure) of the molten resin is large, there is a possibility of damaging the plating processing portion in the plating molding.

Moreover, the technique of gas-injection-molding hollow resin molded articles, such as a vehicle side molding, is well-known (for example, refer patent document 2). This document describes that the surface of a gas injection molded hollow resin molded product is plated. However, a technique for gas injection molding by inserting a resin component plated in advance into a molding die is not known.
JP-A-5-64851 JP-A-2005-53210

  This invention makes it a subject to make it possible to shape | mold a hollow resin molded product with a resin plating component, without damaging the plating process part of a resin plating component in view of the above malfunction.

Means and effects for solving the problems

The present invention for solving the above problems, a resin plating parts plating portion is formed by plating treatment on the surface, the arrangement resin molded article so as to constitute a portion in the formed outer surface curved A method of manufacturing, wherein an outer side surface is a part of the outer surface to form a resin part having a skirt portion extending from an end of the outer side surface toward the inside of the resin molded product, and the outer side surface of the resin part to constitute the resin plated component by plating process, wherein the wall surface of Kiyabiti molds are brought into close contact with the outer surface of the resin plated component and insert, injecting molten resin into a portion of the said Kiyabiti molten a resin injection step, the inside of the skirt portion except the outer side surface of the resin plated component, emitted toward the wall surface of the no resin plated component the Kiyabiti the Fusion inside supplying a gas of the resin, seen containing a gas injection step of forming the hollow, a pressed against the molten resin on the entire wall surface of the Kiyabiti except inner and the outer side surface of the resin plated component, the resin The molded product is characterized in that the molten resin is wrapped around the inner portion of the skirt portion on the back side of the outer surface of the resin-plated component .

  The method for producing a hollow resin molded product according to the present invention includes a molten resin injection molding step for injection molding a molten resin to a resin plated part inserted in a cavity of a mold, and a gas for supplying gas to the injected molten resin. Injection process. Here, if normal injection molding is performed on a mold in which a resin-plated part is inserted, since the holding pressure is large, there is a risk of damaging the plating portion of the resin-plated part. On the other hand, in the manufacturing method according to the present invention, since the gas injection molding is performed on the molding die in which the resin-plated parts are inserted, the holding pressure is small, and it is difficult to damage the plated portion, so that the hollow resin molded product is formed. Can be manufactured. In addition, since the injected molten resin does not easily enter the parting line of each molding die that is joined, the finish of the hollow resin molded product is improved, and a finishing process is not required.

A second aspect of the present invention, assuming the invention of claim 1, wherein the skirt portion of the resin coating part, the holding member for holding the state in a state where the molded mold insert to the Kiyabiti of provided It is characterized by being.

  According to the invention of claim 2, since the attitude of the resin-plated component inserted into the cavity of the mold is maintained, it is possible to mold the hollow resin molded product with the resin-plated component positioned with high accuracy. .

The invention according to claim 3, assuming the invention of claim 1 or 2, wherein the said skirt portion of the resin plated component be provided with a through-hole, the molten resin injected into the Kiyabiti of the mold is characterized by flowing around the peripheral portion of the resin plated component through the Get hole.

  In the invention of claim 3, since the molten resin can be circulated through the through-hole provided in the resin-plated component, the fixed state between the resin-plated component and the hollow resin molded product is ensured.

The invention according to claim 4, subject to any one of the claims 1 to 3, prior Bark fat moldings are outside door handle of the vehicle, the resin plated component is molded integrally with the door handle It is characterized by being a plating mall.

  According to the fourth aspect of the present invention, it is easy to manufacture an outside door handle for a vehicle in which a plating molding is integrally formed.

The invention of claim 5, the resin plated parts plating portion is formed by plating treatment on the surface, a placement resin molded article so as to constitute a portion in the formed outer surface curved, outer By forming a resin part having a skirt portion whose side surface becomes a part of the outer surface and extending from an end of the outer surface toward the inside of the resin molded product, and plating the outer surface of the resin component configure the resin plated component, before the Bark fat moldings, the excluding and the resin coating part in close contact with the outer surface to the wall surface of the cavity of the mold is inserted, the outer surface of the resin plated component and inner skirt, this and the molten resin injected towards a portion of said wall surface in said Kiyabiti of the no resin plated component the mold, the gas inside the molten resin is supplied And a hollow portion that is formed while pressing on the entire wall surface of the Kiyabiti excluding the outer surface of the molten resin and the inside of the resin plated component by the resin molded article, the back side of the outer surface of the resin plated component The molten resin is formed around the inner part of the skirt .

  The hollow resin molded product according to the invention of claim 5 is molded integrally with the resin-plated component without damaging the plated portion of the resin-plated component inserted into the cavity. And since the hollow part is formed, weight reduction is achieved.

  Examples of the present invention will be described. FIG. 1 is a perspective view of a door handle H according to an embodiment of the present invention, and FIG. 2 is a perspective view of a plating molding 4.

  Initially, the door handle H of a present Example is demonstrated. As shown in FIG. 1, the door handle H includes a door handle main body 1 formed in a smooth curved shape, and a fulcrum arm portion 2 provided so as to protrude from one end portion in the longitudinal direction of the door handle main body 1. And a guide arm portion 3 provided so as to protrude from the other end portion. The fulcrum arm unit 2 is connected to a base member (not shown) attached to the door of the vehicle and has a function of serving as a rotation fulcrum when the door handle H is rotated. The guide arm portion 3 is connected to a torsion coil spring (not shown) that is also elastically mounted on the base member, and has a function of returning the rotated door handle H to its original position by its elastic restoring force. Have.

  A plating molding 4 is integrally attached to the door handle body 1 for decoration. As shown in FIG. 2, the plating molding 4 is made of a conductive resin material (for example, PC / ABS), and is exposed to the outside (in a state assembled to the door handle body 1, from the door handle body 1). ) Is plated. In the plating mall 4, each skirt portion 6 is suspended from both end portions in the width direction of the ceiling wall portion 5. A pair of front leg portions 7 are extended from the front end portion in the longitudinal direction of each skirt portion 6, and a pair of rear leg portions 8 are also extended from the rear end portion. In the case of the plating molding 4 of this embodiment, the rear leg 8 is longer than the front leg 7. Each skirt portion 6 is provided with a plurality of (three in the present embodiment) through-holes 6a at predetermined intervals in the longitudinal direction. As will be described later, the molten resin A is injected into the molding die S in which the plating molding 4 is inserted. Since the through-hole 6a is provided in each skirt part 6, the effect that the injected molten resin A becomes easy to go around the skirt part 6 is produced.

  Next, the injection mold S will be described. As shown in FIG. 3, the injection mold S is formed with an upper mold 11 in which a cavity 9 corresponding to the upper half shape of the door handle H is formed and a core 12 corresponding to the lower half shape. It has a lower mold 13. In the lower mold 13, portions corresponding to the fulcrum arm portion 2 and the guide arm portion 3 of the door handle H have an undercut shape, and therefore a slide core (not shown) for forming them is attached. ing. A portion of the lower mold 13 where the fulcrum arm portion 2 is formed is provided with a resin flow path 14 along the left-right direction (lateral direction), and a resin injection port 15 is provided on the side surface of the lower mold 13. ing. Further, in the lower mold 13, a gas flow path 16 is provided in the front half of the door handle body 1 in the longitudinal direction along the vertical direction (height direction). An inlet 17 is provided.

  A method for forming the door handle H according to the present invention will be described. As shown in FIG. 3, a plating molding 4 that has been plated in advance is inserted into the cavity 9 of the upper mold 11. The plating molding 4 is held as it is by holding the front and rear legs 7 and 8 by holding means (not shown). The lower mold 13 is raised, the molding mold S is closed, and the opposing surfaces (parting lines 11a and 13a) of the upper and lower molds 11 and 13 are joined. In this state, as shown in FIG. 4, the molten resin A is injected from the resin injection port 15. The molten resin A that has entered the cavity 9 through the resin flow path 14 flows into the periphery of each skirt portion 6 of the plating molding 4. Since the plurality of through holes 6 a are provided in each skirt portion 6, the molten resin A easily goes around the inner portion of each skirt portion 6. As a result, the molten resin A flows over the entire cavity 9 (molten resin injection process).

  When the molten resin A is injected to such an extent that it occupies the majority of the cavity 9 (see FIG. 4), as shown in FIG. 5, gas is injected from the gas nozzle 18 pressed against the gas injection port 17 at a high pressure. Is done. This gas is desirably nitrogen gas because it does not react with the molten resin A, is inexpensive, and does not affect the operator's human body even if leaked. The gas press-fitted into the cavity 9 through the gas flow path 16 bulges the gas channel 18 (thick part) of the molten resin A and presses it against the inner wall surface of the cavity 9. Since the amount of the injected molten resin A is slightly smaller than the volume of the cavity 9, a hollow portion V is formed in the molten resin A pressed against the inner wall surface of the cavity 9 as shown in FIG. Injection process).

  The molten resin A in the cavity 9 is held for a predetermined time while maintaining the gas pressure acting on the hollow portion V (pressure holding). Here, while the holding pressure (clamping force) when the door handle H is injection molded in a solid state is about 150 MPa, the holding pressure (gas pressure) when the door handle H is gas injection molded in a hollow state. ) Is 10 to 20 MPa. That is, since the holding pressure can be extremely small, there is less risk of damaging the plating process portion of the plating molding 4 (for example, cracks are generated), and the molten resin A in the cavity 9 is made up of the upper and lower molds 11 and 13. It becomes difficult to enter the parting lines 11a and 13a. As a result, the parting lines 11a and 13a in the molded door handle H become smooth (in other words, no burrs are generated), and finishing is not necessary. Moreover, since the plating process part (part exposed outside) in the plating molding 4 is in close contact with the inner wall surface of the cavity 9 of the upper mold 11, the molten resin A does not enter the part.

  After a holding pressure is applied to the molding die S for a predetermined time, the lower die 13 is lowered to open the upper and lower dies 11 and 13. Then, the molded door handle H is discharged.

  The plating molding 4 of the above-described embodiment is provided with front and rear leg portions 7 and 8 in order to hold the plating molding 4 inserted in the cavity 9 of the upper mold 11. However, for example, as shown in FIG. 7, a plurality of suction holes 21 may be provided in the upper mold 11 and the plating molding 22 may be sucked through the suction holes 21. In this case, there is an advantage that the legs 7 and 8 are not required for the plating molding 22 and the shape thereof is simplified.

  In this specification, the door handle H which is an example of the resin molded product has been described. However, other than the door handle H, for example, a vehicle grill guard may be used.

It is a perspective view of the door handle H of the Example of this invention. FIG. 3 is a perspective view of a plating molding 4. FIG. 5 is an operation explanatory diagram in a state where a plating molding 4 is inserted into the cavity 9 of the upper mold 11. FIG. 5 is an operation explanatory diagram in a state where the upper and lower molds 11 and 13 are closed and the molten resin A is injected into the cavity 9. It is action explanatory drawing of the state which injects gas to the molten resin A and forms the hollow part V. FIG. FIG. 6 is a sectional view taken along line XX of FIG. 5. FIG. 10 is an explanatory diagram of an action in a state in which the plating molding 22 inserted into the molding die S is in close contact with the inner wall surface of the cavity 9 by suction. It is a front view of the state which isolate | separated the conventional plating mall 51 and the door handle main body 52. FIG.

Explanation of symbols

A: Molten resin
H: Door handle (hollow resin molded product)
S: Mold
V: Hollow part 4, 22: Plating molding (resin plating part)
7: Front leg (holding member)
8: Rear leg (holding member)
9: Cavity

Claims (5)

A method for producing a resin molded product in which a resin plated part having a plated portion formed on a surface is disposed so as to constitute a part of an outer surface formed in a curved shape ,
By forming a resin part having a skirt portion whose outer side surface becomes a part of the outer surface and extends from the end of the outer side surface toward the inside of the resin molded product, and plating the outer side surface of the resin part Constituting the resin-plated parts,
Wherein the wall surface of Kiyabiti molds are brought into close contact with the outer surface of the resin plated component by insert, the molten resin injection step of injecting the molten resin in part of the said Kiyabiti,
And the inside of the skirt portion except the outer side surface of the resin plated component, the resin plated component without toward the wall surface of the Kiyabiti supplying gas into the injected the molten resin, the said molten resin A gas injection step of pressing the entire wall surface of the cavity excluding the inner side and the outer side of the resin-plated part to form a hollow shape ;
Only containing the resin molded article, the manufacture of the resin plated component of the resin plated component with a hollow resin molded article on the back side of the outer surface, characterized in that was Wrapping the molten resin in the inner portion of the skirt Method. Wherein the said skirt portion of the resin plated component, resin plating according to claim 1, characterized in that the holding member for holding the state in a state of being inserted into the Kiyabiti of the mold is provided Manufacturing method of hollow resin molded product with parts. Wherein the said skirt portion of the resin plated component be provided with a through-hole, the molten resin injected into the Kiyabiti of the mold, it goes around the periphery of the resin plated component through the Get hole The method for producing a hollow resin molded product with a resin-plated part according to claim 1 or 2. Before Bark fat moldings are outside door handle of the vehicle, the resin plated component is according to any one of claims 1 to 3, characterized in that the door handle is plated molding molded integrally Method of hollow resin molded product with resin-plated parts. A resin molded product in which a plated part formed by plating on the surface is disposed so as to constitute a part of the outer surface formed in a curved shape ,
By forming a resin part having a skirt portion whose outer side surface becomes a part of the outer surface and extends from the end of the outer side surface toward the inside of the resin molded product, and plating the outer side surface of the resin part Constituting the resin-plated parts,
Before the Bark fat moldings, the resin plated component, which is inserted in close contact with the outer surface to the wall surface of the mold cavity, and the inside of the skirt portion except the outer side surface of the resin plated component, wherein a molten resin injected towards a portion of said wall surface in said no resin plated component the mold Kiyabiti, the resin plated component the molten resin by the gas is supplied to the inside of the molten resin A hollow portion formed while pressing against the entire wall surface of the cavity excluding the outer surface and the inner surface ,
The resin molded product is a hollow resin molded product with a resin-plated component , wherein the molten resin wraps around an inner portion of the skirt portion on the back side of the outer surface of the resin-plated component.

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