JP2006069065A - Decorative resin molded product and its injection-molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a skin material from being stretched in a cavity at the time of molding. <P>SOLUTION: A hooking projection 7d as an insert mold shape retaining member holding part for holding an insert mold shape retaining member 2b is provided to a movable mold 7 and, when a fixed mold 6 and the movable mold 7 are clamped, the insert mold shape retaining member 2b held by the hooking projection 7d on the side of the movable mold 7 is inserted in a corner shape part molding recessed part 6c of the fixed mold 6 for forming the corner shape part 2a of a pillar garnish 2 being the decorative resin molded product to press the back side of the skin material 4 to hold and fix the skin material 4. The pillar garnish 2 is molded while inserting the insert mold shape retaining member 2b in the cavity formed by clamping the fixed mold 6 and the movable mold 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a decorative resin molded product obtained by decorating a surface of a resin core material such as a pillar garnish that decorates a vehicle body pillar portion of an automobile, and an injection for molding such a decorative resin molded product. The present invention relates to a molding die and an injection molding method.

  Generally, a vehicle interior wall, for example, a front pillar 1 shown in FIG. 1 is beautifully decorated with a pillar garnish 2 that is a decorative resin molded product.

  As shown in FIG. 14, the conventional pillar garnish 2 includes a resin core material 3 and a skin material 4 laminated on the surface of the resin core material 3, and the periphery thereof is a corner having a substantially L-shaped cross section. A square-shaped portion 2 a is formed, and has a shape that matches the shape of the front pillar 1.

  The pillar garnish 2 configured as described above is configured by a decorative resin molded product molded by, for example, injection molding.

Conventionally, what was described in patent document 1 and patent document 2 is known as an injection mold which shape | molds this kind of decorative resin molded product, for example.
Japanese Patent Laid-Open No. 8-174597 (paragraphs 0010-0023, FIGS. 1 to 4) Japanese Patent Application Laid-Open No. 7-60791 (paragraphs 0014 to 0030, FIGS. 1, 2, and 4 to 8).

  The injection mold described in the former publication is a fixed mold, a movable mold that is movably disposed opposite to the fixed mold, forms a cavity by contacting the fixed mold, and can move forward and backward toward the movable mold. The fixed mold and the movable mold are provided with a core provided on the fixed mold, a core driving mechanism provided on the fixed mold for projecting the core, and an injection hole provided on the fixed mold for injecting resin into the cavity. The outer skin material (painting film) supplied between the outer wall and the core is pressed against the movable mold side by the core, and the fixed mold and the movable mold are clamped to clamp and fix the outer periphery of the cavity in the outer skin material. The resin is injected into the cavity from the mold, and an injection molded product having a skin material laminated on the surface is molded.

  The injection mold (in-mold transfer molding apparatus) described in the latter publication is pre-skinned by vacuuming the molding surface of the fixed mold of the fixed mold (cavity block) and the movable mold (core block) as a pair. While the material (transfer film) is adsorbed by the suction block and pulled into the molding surface, the molded product is molded by filling the cavity formed by the molding surfaces of the fixed mold and the movable mold with the resin material. The decorative pattern on the material side is transferred to the surface of the molded product.

  The adsorption of the skin material by the adsorption block means that the cavity formed by the molding surfaces of the fixed mold and the movable mold is in a vacuum state. Therefore, the fixed mold and the movable mold are clamped. Thus, the cavity outer peripheral portion of the skin material is sandwiched and fixed.

  Therefore, in the injection mold described in the former publication, the skin material is clamped in a state of being clamped and fixed on the outer periphery of the cavity, and then pressed against the movable mold side by the core, so that the portion existing in the cavity is thinly extended. It will be. For this reason, the thinned portion of the skin material is torn by the molten resin injected thereafter, and the molten resin may leak to the product surface side.

  In particular, when the elongation coefficient of the skin material is small or when the skin material is a material having a fiber texture such as a knitted fabric, a woven fabric, or a non-woven fabric, tearing of the skin material or resin leakage from the fiber mesh becomes a serious problem.

  Further, in the injection mold described in the latter publication, since the suction block sucks the central portion of the skin material in the cavity, a molded product having a corner portion 2a like the pillar garnish 2 is used. In this case, it is difficult to reliably copy and fix the corner 2a to the corner recess of the cavity for molding, and the inside of the cavity must be evacuated in order to evacuate. The outer periphery of the cavity must be clamped and fixed in advance by a fixed mold and a movable mold.

  And since the outer peripheral part in the cavity of a skin material is being fixed, the skin material which exists in a cavity will be extended thinly. For this reason, the thinned portion of the skin material is torn by the molten resin injected thereafter, and the molten resin may leak to the product surface side.

  Therefore, even in the case of the injection mold described in the latter publication, when the elongation coefficient of the skin material is small or when the skin material is a material having a fiber line such as a knitted fabric, a woven fabric, or a non-woven fabric, The resin leakage is a serious problem.

  Therefore, in view of such points, the present invention provides a molding method for molding a decorative resin molded product so that the skin material is not extended in the cavity during molding, and a decorative resin molded product molded by this manufacturing method. The purpose is to do.

  In order to achieve the above object, the method for injection molding a decorative resin molded product according to claim 1 of the present invention is in a state in which a skin material is disposed between a fixed mold and a movable mold that are arranged to face each other. A decorative resin having a corner-shaped portion formed by clamping the fixed mold and the movable mold to form a cavity by molding surfaces of each other and injecting a molten resin to the back side of the skin material in the cavity An injection molding method for molding a molded article, wherein the outer skin is opposed to a corner forming portion forming recess of the fixed mold in a state where the fixed mold having the corner shape portion forming recess and the movable mold are opened. And a step of disposing a shape retaining member on the back surface of the skin material, a step of clamping the fixed mold and the movable mold, and a step of injecting molten resin into the cavity. Decorative resin molded product with the shape member inserted Characterized by molding.

  With such a configuration, according to the invention of claim 1, the shape-retaining member is not stretched before the molten resin is introduced and before the mold is closed, without stretching the skin material at the location facing the corner-shaped portion. Therefore, it is possible to reduce the amount of extension of the skin material that is extended in the filling process of the molten resin. Therefore, it is possible to effectively prevent the skin material from being locally thinned in the corner-shaped portion and the molten resin from flowing to the surface side of the corner-shaped portion by exceeding the limit of extension. In particular, when using materials such as resin skins, knitted fabrics, woven fabrics, and nonwoven fabrics that have low elongation, the molten resin leaks due to easily exceeding the elongation limit or by locally breaking or passing through the fiber mesh. It is effective because it tends to be easy.

  According to a second aspect of the present invention, there is provided a method for injection-molding a decorative resin molded product according to the present invention. To do.

  According to the second aspect of the invention, in addition to the first aspect of the invention, the shape retaining member can be easily and surely arranged at a predetermined position in the movable mold, so that the productivity is improved and the skin material A good decorative effect can be easily obtained without causing the corner-shaped portion to be displaced.

  Moreover, the decorative resin molded product of the invention described in claim 3 is a decorative resin molded product manufactured by the molding method of claim 1 or 2, wherein the skin material is integrated on the surface of the corner-shaped portion. The shape-retaining member is embedded in the back surface side of the skin material of the corner-shaped portion.

  The decorative resin molded product of the invention according to claim 3 is a thin-walled portion in which the epidermis is localized on the surface side of the corner-shaped portion using a shape-retaining member, and a local skin material extends locally in the corner-shaped portion. No skin is provided, there is no unevenness of gloss, etc., and the influence on the appearance on the surface side of the skin material can be very little or substantially zero.

  According to the present invention configured as described above, before the molten resin is introduced and before the mold is closed, the fixing is performed by the shape-retaining member without stretching the skin material at the location facing the corner-shaped portion. Since it can be applied to the corner-shaped part molding recess of the mold, the amount of the skin material extended in the filling process of the molten resin can be reduced, and as a result, the local part of the skin material in the corner-shaped part It is possible to effectively prevent the melted resin from flowing out to the surface side of the corner-shaped portion. In particular, when using materials such as resin skins, knitted fabrics, woven fabrics, and nonwoven fabrics that have low elongation, the molten resin leaks easily by exceeding the limit of elongation, or by locally breaking or passing through the fiber mesh. It is effective because it tends to be easy.

  Hereinafter, an embodiment for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view illustrating the periphery of a front pillar of a car that is beautifully decorated using a pillar garnish that is a decorative resin molded product, and FIG. 2 is an enlarged perspective view illustrating a part of the pillar garnish in FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2 in the pillar garnish adopting the embodiment according to the present invention, FIG. 4 is a perspective view of the insert-type shape retaining member in the embodiment according to the present invention, and FIG. 6 is a longitudinal sectional view of the injection mold according to the invention, FIG. 6 is an explanatory view showing a state in which the skin material is supplied to the injection mold in FIG. 5 and the insert-type shape retaining member is in contact with the skin material, and FIG. FIG. 8 is an explanatory view showing a state in which the shape retaining member further moves to the stationary mold side and the skin material is moved to the vicinity of the molding surface portion forming the corner shape portion of the pillar garnish in the stationary mold. FIG. The material is fixed FIG. 9 is an explanatory view of the clamped state of the fixed mold and the movable mold after being clamped and fixed at the molding surface portion forming the corner shape portion of the pillar garnish. FIG. FIG. 10 is an explanatory view of a state where the molten resin is supplied to the vicinity of the molding surface portion where the corner shape portion of the pillar garnish is formed, and FIG. 10 is a molding surface where the supply of the molten resin further proceeds to form the corner shape portion of the pillar garnish FIG. 11 is an explanatory view of a state in which the inside of the portion is almost completely filled, FIG. 11 is an explanatory view of a state in which the molten resin completely fills the inside of the forming surface forming the corner-shaped portion of the pillar garnish, and FIG. It is sectional drawing which drawn the principal part of the garnish.

  First, in FIG. 1, a front pillar 1 constituting a framework of a front part of a passenger compartment in an automobile is beautifully decorated with a pillar garnish 2 that is a decorative resin molded product.

  As shown in FIG. 3, the pillar garnish 2 includes a resin core material 3 and a skin material 4 laminated on the surface of the resin core material 3, and a corner portion 2 a is formed in a flange shape around the periphery. Thus, the shape matches the shape of the front pillar 1.

  The corner-shaped portion 2 a is configured in a state in which the skin material 4 is laminated on an insert-type shape retaining member 2 b that is insert-molded in the resin core material 3.

  As shown in FIG. 4, the insert-type shape-retaining member 2 b has a substantially reverse character shape so that the longitudinal direction is a shape that is substantially matched to the longitudinal direction of the pillar garnish 2.

  The cross-sectional shape of the insert shape-retaining member 2 b has a shape that substantially matches the cross-sectional shape of the corner-shaped portion 2 a of the pillar garnish 2.

  A plurality of through-holes 2c are formed in one row (may be a plurality of rows) in the longitudinal direction of the insert-type shape retaining member 2b.

  The molten resin 11 flows into the through-hole 2c when the pillar garnish 2 described later is formed, and a hook portion 3a integrated with the resin core 3 is formed as shown in FIG.

  Next, the pillar garnish 2 configured as described above is molded using an injection mold described below as an embodiment of the present invention.

  As shown in FIG. 5, the injection mold 5 is composed of a fixed mold 6 and a movable mold 7 arranged so as to face each other, and a pair of guide pins 6 a and 6 a implanted in the outer peripheral portion of the fixed mold 6. When the pin hole 7a recessed in the outer peripheral part of the movable mold 7 is fitted and slid, the movable mold 7 is moved with respect to the fixed mold 6, and the mold is clamped. During mold clamping, a cavity 8 (see FIGS. 8 to 11) is formed by the molding surface 6b of the fixed mold 6 and the molding surface 7b of the movable mold 7.

  A corner-shaped portion molding recess 6 c that forms the corner-shaped portion 2 a of the pillar garnish 2 is formed on one outer peripheral portion of the molding surface 6 b of the fixed mold 6.

  The movable die 7 is formed with a gate 7c for supplying molten resin into the cavity 8 so as to penetrate the molding surface 7b, and a hook-like hooking projection at a portion facing the corner-shaped portion molding recess 6c. 7d is provided.

  The hooking projection 7d holds the insert-type shape retaining member 2b by hooking and holding the insert-type shape retaining member 2b on the movable die 7 by hooking a hook recess 2d formed at the lower end of the insert-type shape retaining member 2b. Part.

  In this configuration, in order to mold the pillar garnish 2 that is a decorative resin molded product, first, the movable mold 7 is in an open state with respect to the fixed mold 6 shown in FIGS. 6 is supplied between the molding surface 6 b of the movable mold 7 and the molding surface 7 b of the movable mold 7, and the outer end portion of the skin material 4 covers the insert-type shape retaining member 2 b on the molding surface 6 b side of the fixed mold 6.

  From this mold open state, when the guide pin 6a is guided and slid into the pin hole 7a while the movable die 7 is guided and moved gradually in the direction of the fixed die 6, as shown in FIG. The insert-type shape-retaining member 2b faces each other while facing the corner-shaped portion forming concave portion 6c of the fixed die 6.

  When the movable mold is further moved in the fixed mold 6 direction from this state, the insert-shaped shape-retaining member 2b and the outer shape of the skin material 4 are inserted into the corner-shaped portion forming recess 6c of the fixed mold 6 as shown in FIG. The inside of the outer skin 4 is sandwiched and fixed. At the time of clamping and fixing, the fixed mold 6 and the movable mold 7 are in a clamped state, and the outer end portion of the skin material 4 protrudes outside from the corner-shaped portion molding recess 6 c and is clamped by the fixed mold 6 and the movable mold 7. ing.

  From this state, next, as shown in FIG. 9, the molten resin 9 is supplied from the gate 7c into the cavity 8 on the back surface side of the skin material 4, and the supply of the molten resin 9 is as shown in FIGS. In the process of proceeding, the molten resin 9 fills the cavity 8 and also enters the through hole 2c of the insert-type shape retaining member 2b.

  In this state, when the movable mold 7 is opened with respect to the fixed mold 6, the insert-type shape retaining member 2 b is separated from the movable mold 7.

  Thereafter, when the molded product remaining on the fixed mold 6 side is removed, the outer end portion of the skin material 4 is molded by the insert mold shape retaining member 2b in accordance with the shape of the corner portion shape portion forming recess 6c. By cutting off the remaining length 4a of the skin material 4 left by the cutting machine (not shown) or the like (see FIG. 12), the pillar garnish 2 decorated on the skin material 4 as shown in FIGS. 2 and 3 is completed. To do.

  In the corner portion 2a of the completed pillar garnish 2, an insert type shape retaining member 2b is insert-molded.

  According to the above-described embodiment, when the fixed mold 6 and the movable mold 7 are clamped, the insert mold shape retaining member 2b held by the hooking projection 7d as the insert mold shape retaining member holding portion of the movable mold 7 is fixed. Since the outer surface of the skin material 4 is sandwiched and fixed by the fixed mold 6 and the movable mold 7 because the back surface side of the skin material 4 is sandwiched and fixed by being inserted into the corner-shaped portion molding recess 6 c on the 6 side. In a state in which the corner-shaped portion corresponding portion is sandwiched and fixed while following the forming surface 6b portion of the fixed mold 6 forming the corner-shaped portion 2a of the pillar garnish 2 without being fixed, Even if the mold 7 is clamped and the molten resin 9 is supplied into the cavity, it is possible to prevent the skin material 4 from being thinned by the molten resin 9, and to prevent the skin material 4 from being broken due to the thinning, Molten resin 9 leaks to the product surface side In particular, when the elongation coefficient of the skin material 4 is small or when the skin material 4 is a material having a fiber texture such as a knitted fabric, a woven fabric or a non-woven fabric, the skin 4 is broken or the resin leaks from the fiber mesh. Can be suppressed.

  FIG. 13 shows another embodiment of the insert-type shape retaining member 2b according to the present invention.

  According to FIG. 13, the insert-type shape retaining member 2 b has a pair of leg portions 2 e projecting from the lower end portion, each leg portion 2 e having a pair of engaging claw portions 2 f, and the pillar garnish 2 In a completed state, the pillar garnish 2 is mounted on the front pillar 1 side by projecting from the pillar garnish 2 and engaging the engagement claw portion 2f with an engagement hole (not shown) on the front pillar 1 side. It is composed.

  In the above embodiment, the insert type shape retaining member 2b is provided as the shape retaining member with the hook projection 7d provided on the movable die 7, but is retained by using a double-sided tape or an adhesive. 2b may be temporarily held on the movable mold 7. Furthermore, the shape retaining member 2 b previously bonded to the skin material 4 and integrally formed may be set in the corner-shaped portion molding recess 6 c of the fixed die 6.

  As described above, the present invention allows the shape-retaining member to prevent the fixed mold from being stretched before the molten resin is introduced and before the mold is closed, without stretching the skin material at the location facing the corner-shaped portion. Since it can be applied to the corner-shaped part molding recess, the amount of the skin material extended in the filling process of the molten resin can be reduced, and as a result, the local thin wall of the skin material in the corner-shaped part The limits of elongation and elongation, especially when using materials such as resin skins, knitted fabrics, woven fabrics, and nonwoven fabrics that are less elongated, can easily exceed the elongation limit, or can be locally broken or broken. Since the molten resin tends to leak when it passes, it is effective, so the decoration is made by decorating the surface of the resin core material such as the pillar garnish that decorates the car body pillar part of the car. Plastic molded product As well as suitable for such decorative injection molds and injection molding method for molding the resin molded article.

It is the perspective view which drawn the front pillar periphery of the motor vehicle dressed beautifully using the pillar garnish which is a decorative resin molded product. It is the perspective view which expanded and drawn a part of pillar garnish in FIG. It is AA sectional drawing of FIG. 2 in the pillar garnish which employ | adopted embodiment which concerns on this invention. It is a perspective view of the insert type shape retaining member in the embodiment according to the present invention. It is a longitudinal cross-sectional view of the injection mold which concerns on this invention. It is explanatory drawing of the state which supplied skin material to the injection mold in FIG. 5, and the insert type shape-retaining member contact | abutted to the said skin material. FIG. 7 is an explanatory view showing a state in which the insert-type shape retaining member of FIG. 6 has further moved to the fixed mold side and the skin material has been moved to the vicinity of a molding surface portion that forms the corner shape portion of the pillar garnish in the fixed mold. FIG. 8 is an explanatory view of a clamped state of a fixed mold and a movable mold after the insert mold shape-retaining member sandwiches and fixes the skin material at a molding surface portion that forms the corner shape portion of the pillar garnish in the fixed mold. It is explanatory drawing of the state which reached | attained the molding surface site | part vicinity which supplies molten resin in the cavity formed by the clamping of the fixed type | mold and movable type | mold of FIG. 8, and forms the corner-shaped part of a pillar garnish. FIG. 10 is an explanatory diagram showing a state in which the molten resin in FIG. 9 is further supplied and the molding surface portion forming the corner-shaped portion of the pillar garnish is almost completely filled. FIG. 11 is an explanatory diagram of a state in which the molten resin in FIG. 10 completely fills the molding surface portion that forms the corner-shaped portion of the pillar garnish. It is sectional drawing which drawn the principal part of the shape | molded pillar garnish. It is a perspective view of an insert type shape-retaining member in another embodiment according to the present invention. It is AA sectional drawing in FIG. 2 of the conventional pillar garnish.

Explanation of symbols

2 Pillar garnish (decorated resin molded product)
2a Corner-shaped part 4 Skin material 5 Injection mold 6 Fixed mold 6b Molded surface 6c Corner-shaped part molded concave part 7 Movable mold 7b Molded surface 7d Hook projection (insert-type shape retaining member holding part)
8 Cavity 9 Molten resin

Claims (3)

The fixed mold and the movable mold are clamped in a state in which the skin material is disposed between the fixed mold and the movable mold arranged to face each other, and a cavity is formed by the molding surface of each other, and the back surface of the skin material in the cavity An injection molding method for molding a decorative resin molded article having a corner-shaped portion by injecting molten resin on the side,
With the fixed mold having the corner-shaped part forming recess and the movable mold open, the skin material is arranged to face the corner forming part forming recess of the fixed mold, and is held on the back surface of the skin material. Arranging the shaped member;
Clamping the fixed mold and the movable mold;
A step of injecting a molten resin into the cavity,
A method for injection molding a decorative resin molded product, comprising molding a decorative resin molded product with the shape retaining member inserted. The injection molding method for a decorative resin molded product according to claim 1, wherein the shape-retaining member is arranged in advance on the movable mold at a position corresponding to the corner-shaped portion molding concave portion. A decorative resin molded product produced by the molding method according to claim 1 or 2,
A decorative resin molded product, wherein a skin material is integrally attached to the surface of a corner-shaped portion, and a shape-retaining member is embedded on the back side of the skin-shaped material of the corner-shaped portion.

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