JP2008126500A - Injection-molded article and mold for injection-molding injection-molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a side turn lamp which is miniaturized and made compact by forming a housing to have a thin wall and reduces the amount of a resin to be consumed. <P>SOLUTION: The side turn lamp 1 is molded by secondarily injecting a resin material 4 into a gap S formed when the housing 3 and a lens part 5 molded by primary injection are butted. An injection pressure applied to the housing 3 in the secondary injection is directed to the center in the short length direction of a flat plate part 3a. In this case, since a first mold 7 has a mold surface 7a which is put angularly into the back of the flat plate part 3a, an injection pressure is received by the mold surface 7a, so that the deformation of the housing 7 in a bent shape can be evaded. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to a technical field of side turn lamps (side blinkers) and headlights mounted on a vehicle body, hollow injection molded bodies such as door mirror lamps and tail lamps, and molds for molding injection molded bodies. It is.

  In general, as an example of this kind of hollow injection molded body, a lamp such as a side turn lamp provided so that the bending direction of the vehicle can be visually recognized from the side of the body is also known.

By the way, when manufacturing such a lamp, a housing provided with a light source and a lens part are molded by primary injection, and a resin material is secondarily injected onto the abutting surface where these housing and lens part are abutted to be integrated. In such a case, an injection pressure at the time of secondary injection is received at the abutting part of the housing and the lens part. At this time, the outer surface part of the abutting part (the lens part) ) Can receive the injection pressure due to the support by the mold, but the inner side surface (housing) is hollow and has no mold, so it cannot receive the injection pressure. There was a possibility that the resin material that was injected next would enter the hollow space and be in a buckled state, and it was necessary to consider this.
Therefore, for the first mold that supports the housing during the secondary injection, a convex portion for forming a recessed groove portion is formed on the peripheral edge of the back surface of the housing, and the secondary injection is applied to the groove portion of the housing. There is one in which the buckling is prevented by performing in a state in which the convex portion of one mold is inserted and receiving the secondary injection pressure at the inserted convex portion (see, for example, Patent Document 1). .)
JP 2002-144370 A

  However, in this case, a groove portion is formed on the peripheral edge of the back surface of the housing, and accordingly, the housing becomes thick, which not only hinders downsizing and downsizing, but also a complicated shape, In addition, there is a problem that the property is poor, and there is a problem that the amount of resin consumed increases and the cost becomes high, and there are problems to be solved by the present invention.

The present invention was created in view of the above-described circumstances to solve these problems, and the invention of claim 1 halves between the first mold and the second mold. A first molded body and a second molded body that are in contact with and supported by the first mold, and a second molded body that is supported by contact with the second mold, and An injection-molded body that is integrally molded by performing a secondary injection on the butted butt surfaces, wherein the first molded body receives the injection pressure of the secondary injection by a first mold. In forming the portion, the pressure receiving portion is an injection molded body characterized in that the contact surface with the first mold is a biased surface that is biased toward the second molded body as the distance from the secondary injection site increases.
The invention according to claim 2 is the injection-molded article according to claim 1, wherein the pressure receiving portion is an inclined surface.
The invention according to claim 3 is formed by first injecting and molding the half-shaped first and second molded bodies between the first mold and the second mold, and supported by contact with the first mold. This is a mold for molding an injection molded body for performing a secondary injection on an abutting surface where the first molded body and a second molded body that is abutted and supported by the second mold are abutted against each other and integrally molded. Thus, when forming the pressure receiving portion for receiving the injection pressure of the secondary injection in the first mold, the pressure receiving portion includes a biasing surface that is biased toward the second molded body side as the distance from the secondary injection site increases. This is a mold for molding an injection-molded body.

By setting it as invention of Claim 1 or 3, the injection molded object does not need to form the 1st molded object in thickness, and can be made thin. As a result, a flat shape with a reduced amount of protrusion from the body is achieved, and the amount of resin can be reduced while reducing the size and size.
By setting it as invention of Claim 2, the thickness shaping | molding of a 1st molded object can be made easy.

  Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a side turn lamp corresponding to the injection-molded article of the present invention. The side turn lamp 1 includes a light source 2 such as a light bulb and a light emitting diode, and a back surface (back surface) side on which the light source 2 is incorporated. A housing 3 and a front (front) side lens portion 5 integrated with the housing 3 through a resin portion 4 are provided, and are configured in a substantially elliptical shape having a short direction and a long direction in plan view. Has been.

  The side turn lamp 1 is formed by primary injection of the housing 3 and the lens portion 5 respectively, and then a resin material (resin) is formed in a gap S formed by abutting the housing 3 and the lens portion 5 in an opposing manner. The part 4) is integrally formed by secondary injection. Incidentally, it can be carried out even if a film forming process for forming a reflective surface on the inner surface of the housing 3 is inserted between the primary injection process and the secondary injection process. For example, Japanese Patent No. 3670733 and Japanese Patent No. 3688289 are known, and these can be adopted.

The housing 3 includes a flat plate portion 3a, and a light source incorporating portion 3b for projecting in a cylindrical shape from the central portion of the flat plate portion 3a toward the back side and incorporating the light source 2 therein. .
By the way, the flat plate portion 3a becomes a biased surface 3d that is biased toward the lens portion 5 as the surface that becomes the back surface and is exposed to the outside extends from the peripheral edge 3c to the center in the short direction. Then, since the inner surface is flat (flat), the flat plate portion 3a is formed so as to be inclined in the short direction by inclining so that the externally exposed surface becomes thinner toward the center in the short direction. The cross-sectional surface 3d is formed in a substantially V-shaped cross section where the center in the short direction is deepest, and this offset surface 3d corresponds to the pressure receiving portion of the present invention.

  Further, 3e and 3f shown in FIG. 2 (A) are a pair of attachment pieces that are provided at opposite ends of the housing and are attached to a vehicle body (not shown), and one elastically deformable attachment piece 3e. In a state in which the side turn lamp 1 is deformed, the side turn lamp 1 can be attached by performing a forcible fitting operation in the longitudinal direction.

  3g is a recess formed on the offset surface 3d for allowing elastic deformation of the mounting piece 3e, but if the recess 3g can allow the elastic deformation of the mounting piece 3e by the recess of the offset surface 3d, There is no need to form.

  The side turn lamp 1 is formed by combining two molds, a second mold 6 which is a mold on the upper side in FIG. 3 and a first mold 7 on the lower side in the drawing. First, the housing 3 and the lens portion 5 are molded by primary injection. After the molding, the lens portion 5 remains on the concave mold surface 6 a of the second mold 6, and the housing 3 remains on the concave mold surface 7 a of the first mold 7. After that, the housing 3 and the lens portion 5 are brought into contact with each other, and the secondary injection is performed in the gap S formed between the outer peripheral surface of the flat plate portion 3a of the housing 3 and the first mold 7. The side turn lamp 1 is formed by filling the resin part 4 in this way. For details, see JP-A-11-179754, JP-A-11-162210, JP-A-11-250702, for example. Since it is described, it is omitted.

  The first mold 7 is formed with a mold surface 7a having a mountain-shaped cross section that rises toward the center in the short direction in order to form the offset surface 3d on the back surface of the housing 3 in the primary injection process. The one mold 7 is fitted in such a state that the concave surface 7 a bites into the back surface of the housing 3. When the resin material 4 is secondarily injected into the gap S, the injection pressure acts toward the central side in the short direction with respect to the housing flat plate portion 3a. It is received by the concave surface 7a that has entered the back surface, and is a pressure receiving portion. Note that the arrows shown in FIG. 3 indicate the direction in which the injection pressure during the secondary injection is applied to the lens unit 5 and the housing 3.

  In the embodiment of the present invention configured as described above, the side turn lamp 1 is a secondary injection of the resin material 4 into the gap S formed when the housing 3 and the lens portion 5 formed by the primary injection are brought into contact with each other. The injection pressure acting on the housing 3 during the secondary injection is directed toward the center in the short direction with respect to the flat plate portion 3a. Since the mold 7 has the mold surface 7a in a state of being chevron-shaped with respect to the back surface of the flat plate portion 3a, the housing 7 is deformed in a buckling shape by receiving injection pressure at the mold surface 7a. Can be avoided.

  Moreover, in the side turn lamp 1 formed in this way, the rear surface of the housing 3 is formed as a biased surface 3d that is biased toward the lens portion 5 side by the mold surface 7a, so that the concave portion is formed on the peripheral edge of the rear surface of the conventional housing. It is not necessary to make it thicker because there is a groove like a groove formed, and it can be made thinner and flattened with less protrusion from the body, reducing the amount of resin along with downsizing and compactness It will be planned.

  In addition, this invention is not limited to the said embodiment, As a biasing surface formed in a housing back surface, it is not limited to a V-shape, It is a saddle-shaped biasing surface 8 like FIG. 4 (A). Further, as shown in FIGS. 2B and 2C, the center side has the biased surfaces 9 and 10 that are biased toward the lens portion side, but the center portion is also assumed to be a flat surface 11. be able to.

(A) is a side view of a side blinker, (B) is an XX end view of (A). (A) and (B) are a side view and a rear view of the housing, respectively. (A), (B) is a manufacturing process schematic diagram of the side turn signal before and after the secondary injection. (A), (B), (C) is sectional drawing which shows the other example of the offset surface of a housing, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Side blinker 2 Light source 3 Housing 3a Flat plate part 3b Light source incorporation part 3c Edge edge part 3d Offset surface 3e, 3f Mounting piece 3g Concave part 4 Resin part 5 Lens part 5a Peripheral part 6 Second metal mold 6a Concave surface 7 First metal Mold 7a Concave surface 7b Pressure receiving part S Gap

Claims (3)

A first mold and a second mold that are half-shaped between the first mold and the second mold are formed by primary injection and are supported by contact with the first mold. An injection-molded body that is integrally molded by performing secondary injection on the butted surfaces that abut each other with the second molded body that is supported by contact with the mold,
In forming the pressure receiving portion for allowing the first mold to receive the injection pressure of the secondary injection by the first mold,
The injection-molded body, wherein the pressure receiving portion is a biased surface that is biased toward the second molded body as the contact surface with the first mold becomes farther from the secondary injection site.   The injection molded body according to claim 1, wherein the pressure receiving portion is an inclined surface. A first mold and a second mold that are half-shaped between the first mold and the second mold are formed by primary injection and are supported by contact with the first mold. A mold for molding an injection-molded body for performing a secondary injection on the abutting surfaces that are abutted against each other and a second molded body that is supported by contact with the mold,
In forming the pressure receiving part for receiving the injection pressure of the secondary injection in the first mold,
A mold for molding an injection-molded body, wherein the pressure receiving portion is a biased surface that is biased toward the second molded body as the distance from the secondary injection site increases.

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