JP4289951B2 - Side mall - Google Patents

Description

  The present invention relates to an automobile side molding.

  In many cases, a side molding is attached to the side of an automobile in order to improve decorativeness or protect the body. The side moldings include those that are attached to the vehicle body with clips and those that are attached to the vehicle body with double-sided adhesive tape, and particularly those that are attached with double-sided adhesive tape are provided with positioning structures.

  As a conventional positioning structure, there is one in which a positioning boss is formed on the back surface of the side molding and the positioning boss on the back surface of the side molding is inserted into a molding positioning hole formed at a side molding mounting position of a vehicle body. Examples of the positioning boss include a prism, a cylinder, a cylinder, and a rib.

  The side molding having the positioning boss on the back surface is molded by resin injection molding, but the thickness differs between the positioning boss portion and other portions. For this reason, the contraction state of the resin after injection molding is different between the positioning boss portion and the other portion, and deformation called sink is likely to occur on the surface of the side molding. In particular, when the positioning boss has a horizontal rib shape perpendicular to the resin flow direction during injection molding, the sink marks are more likely to occur than when the vertical rib shape is parallel to the resin flow direction. There is a tendency. The side molding in which the sink mark is generated on the surface has a poor aesthetic appearance, and in the worst case, the commercial value may be lost.

Further, a side molding has also been proposed in which a through hole is formed in the positioning boss so that resin flows through the through hole of the positioning boss during injection molding so as to suppress the occurrence of sink marks.
JP 2003-11738 A Japanese Patent Laid-Open No. 10-60124

  However, in the side molding in which a through hole is formed in the positioning boss, the presence of the through hole not only complicates the mold structure of the injection mold, but also a slide provided in the injection mold to form the through hole. The piece is difficult to be separated from the positioning boss when the side molding is removed, and the positioning boss may be damaged. Moreover, even if through holes are formed in the positioning bosses, it has been difficult to prevent the sink marks to a satisfactory level.

  The present invention has been made in view of the above points, and it is difficult to cause sink marks on the surface of the side molding at the position of the positioning boss, and the slide piece is easily separated from the positioning boss at the time of demolding at the time of injection molding. Provide side moldings that are less susceptible to damage.

The invention of claim 1, in the side molding of the positioning boss to the vehicle body is formed on the back surface, one end of the length direction of the side molding is set to the resin injection gate position during injection molding of the side molding, wherein A plurality of positioning bosses are formed along the length direction of the side molding, and the plurality of positioning bosses are formed in parallel with the orthogonal piece perpendicular to the length direction of the side molding and the length direction of the side molding. A cross-shaped positioning boss having a cross-shape in plan view composed of parallel pieces, an orthogonal piece perpendicular to the length direction of the side molding, and the length of the side molding opposite to the one end side of the orthogonal piece A T-shaped positioning boss having a T-shape in plan view composed of parallel pieces formed in parallel with the direction, and the cross-shaped positioning boss and the T-shaped positioning boss include Thinned-out part of the root of the serial orthogonal pieces thin, characterized in that it is formed on the surface facing the one end of the gate position side in the orthogonal piece

  In the side molding of the present invention, since the meat stealing portion is formed at the root of the positioning boss, the range of increase in thickness due to the presence of the positioning boss is reduced, and the surface sink due to the shrinkage rate change due to the increase in thickness is suppressed. be able to. Furthermore, since the gate position at the time of injection molding of the side molding of the present invention is one end in the length direction of the side molding, the flow of the resin at the time of injection molding coincides with the length direction of the side molding, With respect to the longitudinal ribs parallel to the length direction of the side molding, the sink marks can be hardly generated. Moreover, conventionally, the sink marks are likely to occur in the horizontal ribs orthogonal to the resin flow direction, that is, the horizontal ribs orthogonal to the length direction of the side molding. Since the meat stealing portion is provided on the surface of the base orthogonal to the length direction of the side molding, the sink marks can be less likely to occur in the positioning ribs in the lateral rib shape.

  Further, the side molding of the present invention prevents the meat stealing portion from being different from the through hole penetrating the positioning boss, so that the structure of the slide piece provided in the injection mold for forming the positioning boss is prevented from being complicated. be able to. Further, since the meat stealing portion is different from the through hole, the positioning of the slide piece is less likely to be separated from the positioning boss when the side molding is removed, and the positioning is caused by the slide piece being difficult to separate from the positioning boss. The boss can be prevented from being damaged.

Furthermore, the side molding according to the present invention has the positioning portion of the positioning boss formed on the surface facing one end of the side molding, which is the gate position at the time of injection molding, so that the positioning at the time of demolding from the injection molding die is performed. The boss is not easily damaged. That is, the injection mold of the side molding having a thinned portion in the positioning boss in order to facilitate demolding of the side molding, a slide piece is provided in the thinned portion, the slide piece is the the opening of the mold Slide away from the meat stealer to remove the side molding. At that time, the side molding contracts to the gate side, and the positioning boss approaches the gate side. Therefore, when the meat stealing portion is provided on the opposite side of the gate, the slide piece is also on the opposite side of the gate, and the moving direction of the positioning boss due to the contraction is determined by the positioning boss forming portion of the injection mold. There will be a fixed wall. Therefore, the positioning boss collides with the fixed wall of the positioning boss molding portion by the contraction movement, and is damaged. However, in the present invention, since the meat stealing portion exists on the surface facing the one end of the side molding that is the gate position, the slide piece exists in the contraction direction, that is, the moving side of the positioning boss, and the mold is opened. Since the slide piece also moves in the same direction as the contraction movement direction of the positioning boss, it is difficult to cause damage due to the collision between the positioning boss and the slide piece.

  FIG. 1 is a perspective view of the back side of a side molding in one embodiment of the present invention, FIG. 2 is an enlarged view of part A and part B of FIG. 1, and a figure showing a molding positioning hole of a vehicle body, FIG. 4 is a cross-sectional view of the injection mold, FIG. 5 is a cross-sectional view of the injection mold during injection molding, FIG. 6 is a cross-sectional view of the injection mold during demolding, and FIG. 7 is a fixed mold. FIG. 8 is a plan view of the vicinity of a movable slide piece.

  A side molding 10 shown in FIG. 1 is formed by an elongated injection molded product having a substantially trapezoidal cross section, and one end 11 in the length direction L is used as a gate at the time of injection molding. Reference numeral 12 denotes a trace of the gate cut and removed after the injection molding.

  As for the said side molding 10, the surface 13 comprises the design surface, and the back surface 14 is a mounting surface to a vehicle body. Positioning bosses 15, 16, 16 are formed on the rear surface 14 so as to project at predetermined intervals along the length direction L of the side molding. The positioning bosses 15, 16 and 16 are used for positioning when the side molding 10 is attached to the vehicle body with a double-sided adhesive tape or the like, and are inserted into molding positioning holes formed in the vehicle body.

  In the side molding 10 of this embodiment, the positioning boss 15 closest to the one end 11 on the gate side is an orthogonal piece (a portion corresponding to a lateral rib) 15a orthogonal to the length direction L of the side molding 10. And a cross-shaped positioning boss having a cross shape in a plan view, which is composed of parallel pieces (portions corresponding to vertical ribs) 15b parallel to the length direction L. On the other hand, the other positioning bosses 16 are orthogonal pieces (portions corresponding to lateral ribs) 16a orthogonal to the length direction L of the side molding 10, and one side of the orthogonal pieces 16a, in the illustrated example, A T-shape having a T-shape in plan view composed of parallel pieces (portions corresponding to vertical ribs) 16b formed in parallel to the length direction L of the side molding on the side opposite to the one end 11 on the gate side. It consists of a positioning boss.

  The cross-shaped positioning boss 15 is used to determine a reference position in both the length direction L and the width direction W perpendicular to the length direction L in the side molding 10, and the T-shaped positioning boss 16 is used for that. Is used for positioning in the width direction W perpendicular to the length direction L.

  As shown in FIG. 2A, the molding positioning hole 65 of the vehicle body into which the cruciform positioning boss 15 is inserted has a circular or quadrangular hole shape into which the cruciform positioning boss 15 is fitted. In both the length direction L and the width direction W, the cross-shaped positioning boss 15 is prevented from being displaced.

  On the other hand, as shown in FIG. 2B, the molding positioning hole 66 of the vehicle body into which the T-shaped positioning boss 16 is inserted has the T-shaped positioning boss in the dimension W2 along the width direction W of the side molding 10. 16 and the dimension L2 along the length direction L of the side molding is an ellipse or a rectangle larger than the dimension L1 of the T-shaped positioning boss 16, thereby The distance from the letter-shaped positioning boss 15 to the T-shaped positioning bosses 16 and 16 can be changed. This is because the distance from the cross-shaped positioning boss 15 to the T-shaped positioning bosses 16 and 16 changes due to the shrinkage of the side molding 10 after injection molding, and is difficult to be strictly fixed.

  At the base of the cross-shaped positioning boss 15 and the T-shaped positioning boss 16, a surface orthogonal to the length direction L of the side molding, that is, one side surface of the orthogonal pieces 15a, 16a, in this example, the injection As shown in FIGS. 1 to 3, meat stealing portions 15 d and 16 d are formed at the roots of the surfaces 15 c and 16 c facing the one end 11 which is the gate position at the time of molding. By providing the meat stealing portions 15d and 16d, as understood from FIG. 3, the thickness t of the side molding 10 is such that the meat stealing portion 15d in the cross-shaped positioning boss 15 and the T-shaped positioning boss 16 is the same. , 16d, and the ranges u2, v2 in which the thickness t increases due to the presence of the orthogonal pieces 15a, 16a are larger than the ranges u1, v1 when the meat stealing portions 15d, 16d are not provided. , It decreases along the length direction L of the side molding. Therefore, sink marks after injection molding due to an increase in the thickness of the side molding 10 can be suppressed. Moreover, the meat stealing portions 15d and 16d at the base of the positioning bosses are perpendicular to the length direction L of the side molding 10 which is equal to the resin flow direction at the time of injection molding, that is, the one end 11 in this example. Since it is formed on the facing surfaces 15c and 16c, as described in the effect column of the invention, sink marks on the surface of the side molding 10 can be more effectively suppressed. Further, the cross-shaped positioning boss 15 and the T-shaped positioning boss 16 are viewed in plan view due to the presence of the parallel pieces 15b and 16b even if the meat stealing portions 15d and 16d are formed at the roots of the orthogonal pieces 15a and 16a. Since it has a cross shape or a T-shape, strength reduction can be suppressed.

  The molding of the side molding 10 is performed by a known injection molding method in which a molten resin is injected into an injection mold 30 shown in FIG. 4 by an injection molding machine (not shown). The injection mold 30 is composed of a fixed mold 31 and a movable mold 41 and can be opened and closed.

  As understood from the cross-sectional view of FIG. 4 and the plan view of FIG. 7, the fixed mold 31 includes a cavity 32 corresponding to the shape of the side molding 10 and a gate serving as an inlet of molten resin to the cavity 32. 33, a runner 34 serving as a flow path of the molten resin to the gate 33 is formed. The illustrated injection mold 30 is a two-cavity type that simultaneously molds two side moldings, and is provided with two cavities 32. The gate 33 is provided at one end of the cavity 32 so as to correspond to the one end 11 in the length direction L of the side molding 10.

  As shown in FIG. 4, the movable mold 41 is formed to form a cross-shaped positioning boss forming recess 45 for forming a cross-shaped positioning boss 15 on the back surface 14 of the side molding 10 and the T-shaped positioning boss 16. The T-shaped positioning boss forming recess 46 is provided. The cross-shaped positioning boss forming recess 45 and the T-shaped positioning boss forming recess 46 are provided with a cross-shaped positioning boss slide piece 47 and a T-shaped positioning boss slide piece 48.

  The cruciform positioning boss slide piece 47 forms a cruciform positioning boss forming resin filling space 49 with the inner surface of the cruciform positioning boss forming recess 45. Further, in the cross-shaped positioning boss slide piece 47, a surface 47a opposite to the gate 33 and an inner surface 45a of the cross-shaped positioning boss forming recess 45 facing the surface 47a are provided on the side molding 10. A concavo-convex shape corresponding to the outer shape of the cross-shaped positioning boss 15 is formed. Further, on the slide piece 47 for the cross-shaped positioning boss, a protrusion 47b forming the meat stealing portion 15d of the cross-shaped positioning boss 15 is opposite to the gate 33 at the tip of the surface 47a on the fixed mold 31 side. It is formed facing.

  Also, the cross-shaped positioning boss slide piece 47 in this embodiment has two halves 47c separated in the width direction W perpendicular to the length direction L of the side molding 10, as shown in FIG. It is comprised by 47c, and is connected with the protrusion plate 42 by the connection pin 43 which inclined with respect to the length direction L and the width direction W of the said side molding 10. FIG. Then, the cross-shaped positioning boss slide piece 47 is formed on the surface 47a of the cross-shaped positioning boss slide piece 47 and the cross-shaped positioning boss by the operation of the protrusion plate 42 when the injection mold 30 is opened. While the gap between the concave portion 45 and the inner surface 45a is increased, that is, in the direction toward the one end 11 of the side molding 10 on the gate 33 side, and in the direction in which the two halves 47c and 47c are separated from each other, The cross-shaped positioning boss 15 of the side molding 10 is protruded from the cross-shaped positioning boss forming recess 45 by protruding from the character-shaped positioning boss forming recess 45 toward the fixed mold 31. The cross-shaped positioning boss slide piece 47 is not limited to one separated into the two halves 47c and 47c, and may be constituted by one piece that is not separated into two.

  The T-shaped positioning boss slide piece 48 forms a T-shaped positioning boss forming resin filling space 50 with the inner surface of the T-shaped positioning boss forming recess 46. FIG. 8B is a plan view of the T-shaped positioning boss slide piece 48 in the movable die 41. The T-shaped positioning boss slide piece 48 has a surface 48a opposite to the gate 33 and an inner surface 46a of the T-shaped positioning boss forming recess 46 facing the surface 48a. A concavo-convex shape corresponding to the outer shape of the T-shaped positioning boss 16 is formed. Further, the T-shaped positioning boss slide piece 48 has a protruding portion 48b forming a meat stealing portion 16d of the T-shaped positioning boss 16 opposite to the gate 33 at the front end of the surface 48a on the fixed mold 31 side. It is formed facing.

  Further, the T-shaped positioning boss slide piece 48 in this embodiment is connected to the protruding plate 42 by a connecting pin 44 inclined with respect to the length direction L of the side molding 10, and the mold opening of the injection mold 30 is performed. When the protrusion plate 42 is actuated at this time, it slides in the direction of increasing the distance between the surface 48a and the inner surface 46a of the T-shaped positioning boss forming recess 46, that is, close to one end 11 of the side molding 10 on the gate 33 side. However, the T-shaped positioning boss 16 on the back surface of the side molding 10 is protruded from the T-shaped positioning boss forming recess 46 by protruding from the cross-shaped positioning boss forming recess 46 to the fixed mold 31 side.

  As shown in FIGS. 4 and 5, the injection mold 30 is injected with molten resin P from an injection molding machine (not shown) with the fixed mold 31 and the movable mold 41 closed. The injected molten resin passes through the runner 34 and the gate 33 and fills the cavity 32, the cross-shaped positioning boss forming resin filling space 49 and the T-shaped positioning boss forming resin filling space 50, and then Harden. At this time, a body portion excluding the positioning boss of the side molding 10 is formed by the molten resin filled in the cavity 32, and the cross-shaped positioning is performed by the molten resin filled in the resin filling space 49 for forming the cross-shaped positioning boss. The boss 15 and the meat stealing portion 15d are formed, and the T-shaped positioning boss 16 and the meat stealing portion 16d are formed by the molten resin filled in the T-shaped positioning boss forming resin filling space 50.

  Thereafter, as shown in FIG. 6, the movable mold 41 is moved to open the mold, and the protruding plate 42 is advanced in the direction of the fixed mold 31, so that the connection pins 43 and 44 are used to move the mold. The cross-shaped positioning boss slide piece 47 and the T-shaped positioning boss slide piece 48 are projected, and the side molding 10 which is a molded product is removed from the mold.

  At the time of the demolding, the cross-shaped positioning boss slide piece 47 and the T-shaped positioning boss slide piece 48 are connected to the meat stealing portions 15d and 16d side of the cross-shaped positioning boss 15 and the T-shaped positioning boss 16, respectively. As the protruding plate 42 moves forward, it slides toward the one end 11 of the side molding 10 that is the gate position during the injection molding, and moves away from the meat stealing portions 15d and 16d. Therefore, the side molding 10 starts to shrink toward the one end 11 on the gate side along the length direction L by opening the injection mold 30 by opening the mold, and thereby the cross-shaped positioning boss 15 and Even if the position of the T-shaped positioning boss 16 is shifted to the one end 11 side of the side molding 10, the cross-shaped positioning boss 15 and the T-shaped positioning boss 16 are provided with the cross-shaped positioning boss slide piece 47. In addition, there is no risk of colliding with the T-shaped positioning boss slide piece 48, and there is no risk of breakage. From the cross-shaped positioning boss forming recess 45 and the T-shaped positioning boss forming recess 46 of the movable die 41, smooth and breakage etc. It is pushed out without causing any trouble.

It is a perspective view of the back side of the side molding concerning one Example of the present invention. It is a figure which shows the enlarged view of the A section of FIG. 1, and the B section, and the molding positioning hole of a vehicle body. It is 3A-3A and 3B-3B sectional drawing of FIG. It is sectional drawing of an injection mold. It is sectional drawing of the injection mold at the time of injection molding. It is sectional drawing of the injection mold at the time of mold removal. It is a top view of a fixed type. It is a top view of the vicinity of a movable slide piece.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Side molding 11 End of side molding made into gate position 15 Cross-shaped positioning boss 15a Cross piece of cross-shaped positioning boss 15b Parallel piece of cross-shaped positioning boss 15c Face which faced one end of side molding made into gate position 15d Ten 16 T-shaped positioning boss 16a Orthogonal piece of T-shaped positioning boss 16b Parallel piece of T-shaped positioning boss 16c Face facing one end of side molding defined as gate position 16d Cross-shaped positioning boss meat stealing Part 30 Injection mold 31 Fixed mold 32 Cavity 33 Gate 34 Runner 41 Movable type 47 Slide piece for cross-shaped positioning boss 48 Slide piece for T-shaped positioning boss

Claims (1)

In the side molding (10) in which the positioning bosses (15, 16) to the vehicle body are formed on the back surface,
One end (11) in the length direction of the side molding is a resin injection gate position at the time of injection molding of the side molding,
A plurality of the positioning bosses (15, 16) are formed along the length direction (L) of the side molding,
The plurality of positioning bosses (15, 16) include an orthogonal piece (15a) orthogonal to the length direction (L) of the side molding and a parallel piece formed in parallel to the length direction (L) of the side molding ( 15b), a cross-shaped positioning boss (15) having a cross shape in plan view, an orthogonal piece (16a) orthogonal to the length direction (L) of the side molding, and the one end of the orthogonal piece (16a) (11) a T-shaped positioning boss (16) having a T-shape in a plan view composed of a parallel piece (16b) formed in parallel to the length direction (L) of the side molding on the side opposite to the side And
The cross-shaped positioning boss (15) and the T-shaped positioning boss (16) have a meat stealing portion (15d, 16d) for thinning the root of the orthogonal piece (15a, 16a), and the orthogonal piece (15a, 16a) . A side molding which is formed on a surface (15c, 16c) facing the one end (11) on the gate position side in 16a) .

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