JP2002113743A - Injection molded object and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent such a phenomenon that a secondarily injected resin matgerial penetrates into the surface of a lens part 2 upon the reception of secondary injection pressure, in producing a side winker 1 by abutting the primarily molded lens part 2 and a housing 4 mutually to integrate them by secondary injection. SOLUTION: At the time of secondary injection, the molding surface Ya of a mold is set so that the outer surface of a secondary injection region becomes a recessed state by A as compared with the outer end edge (corner part) 2g of the lens part 2 and, by secondarily injecting a resin material 5 in this state, the resin material 5 is prevented from exceeding the outer end edge 2g to penetrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of various injection-molded articles such as side blinkers mounted on an automobile body.

[0002]

2. Description of the Related Art In general, as an example of this kind of injection molded article, there is a lamp, specifically a side turn signal, provided so that the bending direction of a vehicle can be visually recognized from the side of the body. In this side blinker, a lens part and a housing in which a light bulb is incorporated are respectively formed by molding, and these are abutted and integrally formed. As a manufacturing method of such a thing, a die slide injection method is known. ing. This method is, for example,
JP-A-38377, JP-A-11-179754, JP-A-11-162210, JP-A-11-2
As described in Japanese Patent No. 50702 and the like, each primary product is molded (primary molding) in a state in which a movable die and a fixed die are vertically opposed to each other, and then the movable die is slid to move both primary products. The members are abutted, and a resin material is secondarily injected into a concave groove formed on the outer periphery of the abutting surface to mold (secondarily mold) a hollow secondary product.

[0003]

However, in these conventional devices, the surface of the resin material to be secondarily injected is set to be flat with respect to the surface of the primary product. In other words, as shown in FIG.
The molds are matched so that the surfaces of the primary products 101 and 102 in the molds are flat with the surfaces, and the secondary injection is performed in this state. However, in this case, the resin material 103 intrudes between the mold and the primary products 101 and 102 under the injection pressure at the time of the secondary injection, whereby
The secondary injected resin material 103 is used as primary products 101 and 102.
There is a problem that the state 104 is attached to the surface of the substrate.
In particular, the penetration of the resin material at the time of the secondary injection is such that the primary product is completely cured (cured) when the primary product is continuously secondary injected without die cutting as in a die slide injection method. In some cases, the injection is easily performed by receiving the injection pressure at the time of the secondary injection. And, the infiltration of the resin material of the secondary injection, when the resin material to be primary injected and the resin material to be secondary injected are different from each other such as those of different colors or different materials, the surface of the primary product There is a problem that the secondary injected resin material is adhered and the appearance is impaired, and there is a problem to be solved by the present invention.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made for the purpose of solving these problems, and a half-split primary product is formed by primary injection. Thereafter, the primary products are butted against each other, and thereafter, a resin material is secondarily injected into the butted portion, whereby the primary products are molded into a secondary product as an integrated product. An injection-molded article characterized in that an injection region of a resin material to be injected is set to be depressed with respect to an outer edge of a surface of at least one primary product. By doing so, in the case of secondary injection, the resin material tries to infiltrate between the mold and the primary product due to the injection pressure, but at most up to the outer edge of the surface of the primary product, Over the primary product surface.
The appearance of the molded injection molded article is not impaired.
In this case, when the primary injection material and the secondary injection material are different, the secondary injection region is formed into a concave shape. In these devices, the injection region of the resin material to be secondarily injected is set so as to protrude stepwise from the surface edge of the other primary product. In this one,
The secondary injection resin material and the other primary injection resin material may be of the same quality. Also, after each primary injection of half-shaped primary products and molding,
The primary products are butted against each other, and then, after the resin material is secondarily injected into the butted portion to form an injection molded body as a secondary product obtained by integrating the primary products, the secondary injection is performed at least. A method for manufacturing an injection-molded article, characterized in that the method is performed in a state of being fitted into a mold having a mold surface set to be concave with respect to the surface edge of one primary product. .

[0005]

Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a side turn signal, and the side turn signal 1 is composed of a lens unit 2 and a housing 4 in which a light bulb 3 is incorporated. The lens unit 2 and the housing 4 are primary products which are half-split products. After being molded by a fixed mold and a movable mold, respectively, the movable mold is slid and the two primary products are butted together, and then the resin material 5 is secondarily injected into the butted surface portion to be integrally molded as described later. It is formed by a conventionally known die slide injection method, and details thereof are omitted.

The lens portion 2 formed by the primary injection molding has a bowl shape, and a horizontal first end surface portion 2a is formed at an opening edge facing in the front-rear direction. A stepped surface portion 2b projecting stepwise from the outer peripheral edge of the first end surface portion 2a toward the housing 4; a second end surface portion which is horizontal from the leading edge of the stepped surface portion 2b and continues to the outer peripheral surface 2c of the lens portion 2; 2d are sequentially formed. The first end face 2
On the inner side of a, a tapered surface portion 2f which is inclined toward the center toward the bottom of the lens portion in a state following the inner peripheral surface 2e of the lens portion having a bowl shape is further formed. Incidentally, the material forming the lens unit 2 is a polycarbonate resin.

On the other hand, a housing 4 formed by primary injection molding has a socket portion 4 to which a light bulb (bulb) 3 is attached.
a and a flange portion 4b protruding from an outer peripheral edge of the socket portion 4a in a horizontal (left-right) flange shape. The flange portion 4b is integrally formed with an end edge portion of the first end surface portion 2a. A contact horizontal surface portion 4c in contact with the inner diameter side half portion and an outer end surface portion 4d which is an outer peripheral end surface of the contact horizontal surface portion 4c in a state of being separated from the step surface 2d are formed. Further, a fitting projection 4e that fits into the inner peripheral hollow surface of the lens portion 2 is formed on the flange portion 4b.
A tapered surface portion 4f which is inclined so as to face the tapered surface portion 2f is formed on the outer peripheral edge of the tapered surface portion 2f. By the way,
The material of the housing 4 is an acrylic resin.

In the side winker 1, the lens part 2 injection-molded as the primary product and the housing 4 are brought into contact with each other by die slide, and at this time, the housing fitting convex part 4e becomes
To the hollow inner peripheral surface of. In this case, the tapered surface portions 2f and 4f are brought into contact with each other and the contact horizontal surface portions 2a and 4c are abutted against each other. The body of the turn signal 1 is molded.
Back surface 4g of flange portion 4b and outer peripheral surface 2c of lens portion
Is injected into a band-shaped space formed in a mold so as to be substantially flush with each other, so that the secondary resin material 5 is located outside the housing-side outer end surface portion 4d of the first end surface portion 2a, and has a cross section. 2b, the protruding horizontal surface portion 2d, and the outer end surface portion 4d on the housing side are set so as to be adhered to each other. In this way, the lens portion 2 and the housing 4, which are the primary products, are the secondary products. When the side winker 1 is formed, it is set so as to abut on a substantially L-shaped corner portion in surface contact. Incidentally, in the present embodiment, the resin material 5 that is secondarily injected is the lens portion 2.
Although the color and the material are different from those of the housing 4, the same acrylic resin as the color and the material of the housing 4 is adopted.

Further, in this vehicle, the side turn signal 1
Has an elliptical shape, and the housing 4 is fitted into a mounting hole 6 formed in the vehicle body B. A locking groove 4h for locking is formed, and a locking leg 4i having elasticity is formed on the other side. Then, the side winkers 1 are forcibly fitted into the mounting holes 6 so that the locking legs 4i are elastically deformed toward the center side.
When h reaches the hole edge of the mounting hole 6, the locking leg 4i is partially elastically returned, so that the inner peripheral edge of the mounting hole 6 fits into the locking groove 4h, so that simple elastic mounting can be performed. However, a concave groove 4j is formed on the back surface (outer surface) of the flange portion 4b facing the fitting convex portion 4e except for the portions corresponding to the locking grooves 4h and the locking legs 4i. I have.

[0010] Next, the mold matching state based on the die slide injection system in the case of the primary injection and the secondary injection will be described in detail with reference to FIG. Assuming that X is a first mold which is a fixed side and Y is a second mold which is a movable side, first, a mold matching state at the time of primary injection is performed. X includes a resin material 5 to be secondarily injected together with the mold surfaces corresponding to the back surface 4g of the flange portion 4b, the groove surface of the concave groove 4j, the back surface of the fitting convex portion 4e, and the like.
Of the injection region, that is, a mold surface such as a mold surface Xa which is flat with the back surface 4g of the flange portion. On the other hand, the mold surface corresponding to the contact horizontal surface portion 4c of the flange portion 4b, the outer end surface portion 4d, the surface of the fitting convex portion 4e, the tapered surface portion 4f, and the like is formed in the second mold Y. On the other hand, on the lens unit 2 side, the first mold X has a lens unit inner peripheral surface 2e,
Each surface of the tapered surface portion 2f, the contact horizontal surface portion 2a, and the protruding surface portion 2b, and a corner portion (the lens surface 2c) formed by the lens outer peripheral surface 2c of the protruding horizontal surface portion 2d and the protruding horizontal surface portion 2d.
A mold surface corresponding to a surface such as a surface Xb at a position deviated by A from the outer peripheral edge 2g of (c) toward the inner peripheral surface side of the lens to form a concave shape is formed. On the other hand, the second die Y has a lens outer peripheral surface 2.
c, a mold surface such as a mold surface Ya, which is an outer surface of the resin material region at the time of secondary injection, is formed by fitting into the corner portion 2g and abutting against the mold surface Xb. Then, primary injection is performed in this mold matching state, and the lens unit 2 and the housing 4 are molded as a primary product.

When the primary injection molding is performed, the first mold X is released from the lens unit 2 side, the secondary mold Y is released from the housing 4 side, and then the lens unit 2 and the housing 4 are released. The mold is moved when they meet, and the molds are matched.
Then, the resin material 5 is secondarily injected in this mold matching state, and the area of this secondary injection is, as described above, the mold surface Ya serving as the outer surface of the secondary injection area of the second mold Y. It is set as a concave shape with respect to a corner portion 2g between the lens outer peripheral surface 2c and the protruding horizontal surface portion 2d, and secondary injection is performed in this state. Means that even if it enters the gap between the second mold Y and the lens portion 2, it will be stopped at most up to the corner portion 2 g and reach the lens portion surface 2 c beyond the corner portion 2 g. Can be avoided.

By the way, the groove 4j of the present embodiment is such that the groove side surface on the side where the resin material 5 is secondarily injected (the groove side surface on the left side in FIGS. 6 and 7) has a wider groove width toward the groove opening end side. And has a tapered surface contact with the first mold X. In other words, the pressing surface portion is configured so as to come into contact with the outer peripheral side by an angle α with respect to the fitting direction Y of the fitting convex portion 4e. Then, when receiving the injection pressure of the secondary injection, the flange portion 4b receives a force that slides on the tapered contact surface with the first mold X and presses toward the fitting convex portion 4e. , Tapered surface 2f, 4f
The horizontal plane portions 2a and 4c are set so that close contact between them can be achieved.

In the embodiment of the present invention configured as described above, the side blinker 1 completed as a secondary product pushes the lens part 2 and the housing 4 formed as described above by the die slide method. 5 and 6, the abutting portion is the opening edge of the lens portion 2 which is oriented substantially vertically and the flange end of the housing 4 which is oriented substantially horizontally. As for the injection pressure when the secondary resin material 5 is injected, the injection pressure in the vertical direction is received by the edge of the opening of the lens unit, and the injection pressure in the horizontal direction is received by the housing flange 4b. become. In other words, the opening edge of the lens portion has a width in the vertical direction, and the flange portion 4b has a face plate structure having a width in the left-right direction to receive the injection pressure. Therefore, the injection pressure acts in the thickness direction. It is possible to prevent the deformation due to the injection pressure as in the case. As a result, there is no need to protrude in the form of a flange from the outer peripheral edge of the side winker or increase the wall thickness as in the conventional case, and it is not necessary to receive a secondary injection pressure. become.

In this case, the outer surface of the injection area at the time of secondary injection of the resin material 5 is recessed by the length A with respect to the outer edge of the surface 2c, that is, the corner 2g on the lens portion 2 side. The shape is set by the mold surface Ya of the second mold Y, and as a result, the resin material 5 will enter the gap between the second mold Y and the lens portion 2 by receiving the injection pressure of the secondary injection. In this case, the resin material to be penetrated reaches at most between the second mold Y and the protruding horizontal surface portion 2d and reaches the lens portion surface 2c beyond the corner portion 2g. As a result, the resin material 5
Even if the lens portion 2 is made of a different material or of a different color, the lens portion surface 2c does not become unsightly due to the penetration of the resin material 5,
The appearance is excellent.

In addition, when the flange portion 4b receives the secondary injection pressure, it is deformed toward the fitting convex portion 4e depending on the injection pressure.
Even when the mold surface is set so as to be exactly flush with the rear surface 4g of the flange portion as shown in FIG. Thus, the close contact state is surely ensured.
In this case, the larger the step Z is, the larger the deformation of the flange portion 4b under the secondary injection pressure is. This indicates that the angle α of the concave groove 4j is adjusted in size. As a result, the degree of closeness can be adjusted, and a product corresponding to the strength and stability required as a product can be supplied.

Further, in this case, the tapered surface portion 2f of the lens portion 2 is pressed down and comes into close contact with the tapered surface portion 4f of the housing 4, so that the resin material 5 is formed into a burr-like shape on the tapered surface portions 2f and 4f which are in close contact. As a result, it is possible to prevent intrusion and prevent deformation of the primary product. After the tapered surface portions 2f and 4f are brought into close contact with each other, the resin material 5 is formed by secondary injection. At this time, the fitting protrusion 4 formed on the housing 4 side is formed.
Since e fits into the hollow inner peripheral surface side of the lens portion 2 in close contact and receives the injection pressure at the time of secondary injection, deformation can be prevented. Moreover, the lens portion 2 of the fitting projection 4e
Contact with the respective tapered surface portions 2f, 4f
Therefore, even if there is a processing error, the fitting of the fitting projection 4e to the lens 2 side and the surface contact are performed reliably, and the effect of receiving the secondary injection pressure is improved. The effect of preventing deformation is further enhanced.

Further, in this embodiment, a concave groove 4j is formed on the back surface of the housing 4 corresponding to the fitting convex portion 4e for receiving the secondary injection pressure, and a die presser having a die inserted in the concave groove 4j. Since the secondary injection is performed in this state, the strength of the fitting projection 4e can be increased, further prevention of deformation can be achieved, and a high-quality side winker 1 without deformation can be efficiently produced. In addition, the concave groove 4j is in contact with the mold X in a state in which the groove width is set to be wider toward the groove opening end side. As a result, when the secondary injection pressure is applied, the tapered portion 4b is fitted with the convex. Part 4
As a result, the contact between the lens portion 2 and the surface contact portions of the housing 4 is made denser and there is no gap therebetween. High-quality side winker 1 with excellent appearance, avoiding entry into the surface with unevenness
Can be manufactured.

The present invention is not limited to the above-described embodiment, and when the resin material to be injected secondarily and the primary product are of the same quality, the resin material to be injected secondarily is the same as that of the primary product. Even if it penetrates into the surface, the difference cannot be recognized, so it is not necessary to make it into a concave shape. 9), as shown in FIG. 9, the resin material 5 can be recessed with respect to both outer edges 2 g and 4 k of the lens portion 2 and the housing 4.
By doing so, it goes without saying that the resin material 5 can be prevented from adhering to any surface of the lens unit 2 and the housing 4.

[Brief description of the drawings]

FIG. 1 is a side view of a side turn signal.

FIG. 2 is a bottom view of a side turn signal.

FIG. 3 is a cross-sectional view of a side turn signal.

FIG. 4 is a longitudinal sectional view of a side turn signal.

FIG. 5 is an enlarged partial cross-sectional view of a main part of a side turn signal.

FIG. 6 is an enlarged partial longitudinal sectional view of a main part of a side turn signal.

FIG. 7 is a partial cross-sectional view showing a state of performing primary injection and secondary injection.

FIG. 8 is a partially enlarged cross-sectional view of an injection molded product.

FIG. 9 is a partially enlarged cross-sectional view of an injection-molded article showing a second embodiment.

FIG. 10 is a partially enlarged sectional view of a conventional injection molded body.

[Explanation of symbols]

 2 Lens part 2g Corner part 4 Housing 5 Secondary injected resin material

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masayuki Higuchi 135-10 Nishishinmachi, Ota City, Gunma Prefecture Oshima Electric Works, Ltd. (72) Inventor Shisei Ishizawa 135-10 Nishishinmachi, Ota City, Gunma Prefecture Dai Co., Ltd. Inside Shima Electric Works (72) Inventor Norio Fukasawa 135-10 Nishishinmachi, Ota City, Gunma Prefecture Inside Oshima Electric Works Co., Ltd. (72) Inventor Sumimi Oyama 135-10 Nishishinmachi, Ota City, Gunma Prefecture Oshima Electric Works Co., Ltd. (72) Inventor Hitoshi Kurihara 135-10 Nishishinmachi, Ota City, Gunma Prefecture Oshima Electric Works Co., Ltd. (72) Inventor Takashi Isagi 135-10 Nishishinmachi, Ota City, Gunma Prefecture Oshima Electric Works Co., Ltd. 72) Inventor Masayuki Ito 135-10 Nishishinmachi, Ota-shi, Gunma F-term (reference) 4F206 AA21 AG27 AG28 AH17 AM32 JA07 JB28 JN12 JQ81

Claims (6)

[Claims] After the primary products are molded by a primary injection, the primary products are butted against each other, and then the resin products are secondarily injected into the abutting portions so that the primary products are integrally formed. In the injection molded article molded as a secondary product, the injection region of the resin material to be secondary injected is set to be concave with respect to the outer edge of the surface of at least one of the primary products. An injection molded article characterized by the above-mentioned. 2. The injection-molded article according to claim 1, wherein the secondary injection region has a concave shape when the primary injection material and the secondary injection material are different. 3. The method according to claim 1, wherein an injection area of the resin material to be secondarily injected is set so as to protrude stepwise from a surface edge of the other primary product. Injection molding. 4. The injection-molded article according to claim 3, wherein the resin material to be secondarily injected and the other resin material to be primarily injected are of the same quality. 5. The method according to claim 3, wherein the first injected resin material is a different first and second resin materials, and the second injected resin material is the same as the first resin material. Injection molded body characterized. 6. A primary product which is half-split and is formed by primary injection, and the primary products are butted together. Thereafter, a resin material is secondarily injected into the butted portion to integrate the primary products together. In molding the injection molded body as a converted secondary product, the secondary injection was fitted into a mold having a mold surface set to be concave with respect to the surface edge of at least one of the primary products. A method for producing an injection-molded article, which is performed in a state.