JP2011083986A - Resin component for vehicle and injection molding die for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin component for a vehicle in which production of a weld line can be effectively prevented and which therefore advantageously assures sufficient designability, and to provide an injection molding die for the resin component for the vehicle. <P>SOLUTION: In the resin component for the vehicle, a first plate-shaped leg 30, a second plate-shaped leg 32 and a plate-shaped connection 34 constitute a U-shaped part 24 and further plate thickness of the first plate-shaped leg 30: t<SB>1</SB>, plate thickness of the second plate-shaped leg 32: t<SB>2</SB>and plate thickness of the plate-shaped connection 34: t<SB>3</SB>are set to the size satisfying a relationship: t<SB>1</SB>>t<SB>3</SB>≥t<SB>2</SB>. Further, a gate for injection molding is provided at a position where a flow of a molten resin in a molding cavity at the injection molding is made to a flow running from one end part to the other end part of the plate-shaped connection in a direction vertical to both directions: an opposing direction of the first plate-shaped leg 30 and the second plate-shaped leg 32; and a plate thickness direction of the plate-shaped connection 34. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a resin component for a vehicle and an injection molding die thereof, in particular, an improvement of a resin component for a vehicle that can be suitably applied as an interior component for a vehicle such as an inside handle of an automobile door, and such a vehicle. The present invention relates to a novel structure of an injection mold that can be advantageously used when molding resin parts.

  2. Description of the Related Art Conventionally, resin molded products having excellent moldability and light weight have been widely used as interior parts and exterior parts for vehicles. Such vehicle resin parts are generally formed by injection molding. In such vehicle resin parts, painting, plating, or the like is usually performed after molding to improve the design.

  On the other hand, injection-molded articles using so-called material resin such as colored resins pre-colored with pigments, dyes, etc., or brilliant resins obtained by further adding a brilliant material such as aluminum flakes to such colored resins are also used in vehicles. It has come to be used as a resin part for use (see, for example, Patent Document 1 below). In the resin component for a vehicle made of an injection molded product of such a resin material, since painting and plating after molding are unnecessary, it is possible to advantageously simplify the manufacturing work and reduce the cost, There is an advantage that the deterioration of the appearance due to the peeling of the coating film or the plating film can be effectively eliminated, and it is actually applied to, for example, an inside handle of an automobile door.

  However, resin design parts for automobiles that require a relatively large strength, such as the inside handle, have the first plate-like leg portions arranged opposite to each other in order to obtain sufficient strength. The cross section of the second plate-like leg portion is integrally provided with a plate-like connecting portion that interconnects the first plate-like leg portion and the second plate-like leg portion. A part may be constituted by the U-shaped part, or the whole may be constituted by the U-shaped part. In addition, in order to ensure designability, the plate surface of the first plate-like leg portion and the plate surface of the plate-like connecting portion in the U-shaped portion are respectively designed surfaces, while the second plate shape The plate surface of the leg portion may be a non-design surface, but if the resin component having such a U-shaped portion is formed by injection molding using a resin material, the following There was a risk of problems such as

  That is, in an injection molded product having a U-shaped part, the molten resin flowing in the molding cavity forming the U-shaped part at the time of molding, for example, the molten resin flowing in the molding cavity forming the flat plate part Therefore, there is a high possibility that a weld line (weld mark) occurs in the U-shaped portion. When such an injection-molded product is a resin component for a vehicle using a resin material, no coating or plating is applied to the surface. Therefore, if a weld line is formed on the design surface, The line becomes visible from the outside as it is, and as a result, a serious problem that the design property is remarkably lowered is caused.

JP 2008-49652 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the first plate-like leg portion and the second plate-like leg arranged opposite to each other. And a U-shaped portion having a U-shaped cross section, and a plate-shaped connecting portion integrally connecting the first plate-shaped leg portion and the second plate-shaped leg portion. In addition, the plate surface of the first plate-like leg portion and the plate surface of the plate-like connecting portion in the U-shaped portion are respectively design surfaces, while the plate surface of the second plate-like leg portion is a non-design surface. In the resin parts for vehicles made of injection molded products, the occurrence of weld lines is effectively prevented, so that sufficient design properties are advantageously ensured even without a coating covering the design surface. The object is to provide an improved structure. In addition, in the present invention, it is an object of the present invention to provide an injection mold that can advantageously injection-mold such a vehicle resin part.

  And in the process where the inventor has made various studies for solving such problems, the flow of the molten resin in the molding cavity forming the U-shaped part by injection molding, the occurrence point of the weld line, and It was found that the following relationship exists between: That is, when the molten resin flows in a molding cavity that forms a U-shaped portion by injection molding, the opposing direction of the first plate-like leg portion and the second plate-like leg portion and the plate-like connecting portion plate The molten resin flows from one end of the plate-like connecting portion in the direction perpendicular to both directions of the thickness direction toward the other end, and in the molding cavity portion forming the first plate-like leg. The flow rate of the molten resin flowing from the flow rate of the molten resin flowing in the molding cavity part forming the plate-like connecting part and the flow rate of the molten resin flowing in the molding cavity part forming the second plate-like leg part And the flow rate of the molten resin flowing in the molding cavity part forming the plate-like connecting part is the same as the flow rate of the molten resin flowing in the molding cavity part forming the second plate-like leg part, Or only if it is larger Generation of weld lines on the design surface of the first plate-like leg portion and the design surface of the plate-like connecting portion is prevented as much as possible, and even if a weld line is generated, the occurrence location is It has been found that, in the shape connecting portion, it becomes a location close to the non-design surface of the second plate-like leg portion, which is not so problematic on the design.

And this invention was completed as a result of repeating earnest research based on such knowledge, Comprising: The place made into the summary is the 1st plate-shaped leg part arranged mutually opposed, and The cross section of the second plate-like leg portion is integrally provided with a plate-like connecting portion that interconnects the first plate-like leg portion and the second plate-like leg portion. While having a U-shaped portion, the plate surface of the first plate-like leg portion and the plate surface of the plate-like connecting portion in the U-shaped portion are respectively designed surfaces, while the second plate A resin part for a vehicle made of an injection-molded product in which the plate surface of the shaped leg portion is a non-designed surface, the plate thickness of the first plate shaped leg portion: t _1, and the second plate shaped leg thickness parts: a t _2, a plate of the plate-like connecting portion thickness: and t ₃ is, with are set respectively at a value that satisfies the relation of _{t 1> t 3 ≧ t 2} , the injection molding The flow of the molten resin in the molding cavity forming the character-shaped portion is determined in both directions of the opposing direction of the first plate-like leg portion and the second plate-like leg portion and the thickness direction of the plate-like connecting portion. In the resin component for vehicles, a gate portion for injection molding is provided at a position where the flow is directed from one end portion to the other end portion side of the plate-like connecting portion in a direction perpendicular to .

  Note that the resin component for a vehicle according to the present invention is preferably applied to an inside handle of an automobile door.

Further, in the present invention, the first plate-like leg portion and the second plate-like leg portion that are arranged to face each other, and the first plate-like leg portion and the second plate-like leg portion are mutually connected. A plate-like connecting portion that is integrally connected, and has a U-shaped portion having a U-shaped cross section, and the plate surface of the first plate-shaped leg portion in the U-shaped portion and the plate A molding die used for injection molding of vehicle resin parts in which the plate surfaces of the connecting portions are design surfaces, while the plate surfaces of the second plate-like leg portions are non-design surfaces. Two cavity surfaces each having a molding cavity having a shape corresponding to the U-shaped portion and providing plate surfaces on both sides of the first plate-shaped leg portion in the U-shaped portion. The distance between: d ₁ and the distance between the two cavity surfaces that respectively provide the plate surfaces on both sides of the second plate leg: d _2, and the plate shape The distance between the two cavity surfaces that respectively provide the plate surfaces on both sides of the connecting portion: d ₃ is set at a value satisfying the relationship of d ₁ > d ₃ ≧ d ₂ , and further within the molding cavity The molten resin injected into the first plate-shaped leg portions are opposed to the two cavity surfaces that respectively provide the plate surfaces on both sides, and the two cavity surfaces that respectively provide the plate surfaces on both sides of the plate-like connecting portion. The vehicle resin is characterized in that an injection gate is provided so as to flow in the molding cavity in one direction from one side to the other side in a direction perpendicular to each other. A mold for injection molding of parts is also the gist thereof.

In short, the resin component for a vehicle according to the present invention is formed by injection molding, and includes a U-shaped portion molding cavity for molding a U-shaped portion as an injection molding die used in the injection molding, and The U-shaped portion forming cavity has a plate thickness of the first plate-like leg portion: t ₁ , a plate thickness of the second plate-like leg portion: t _2, and a plate thickness of the plate-like connected product: t ₃ . A structure having a structure that can be set to a size satisfying a specific relationship such as t ₁ > t ₃ ≧ t ₂ is used.

  That is, a first plate-like leg forming cavity part that forms the first plate-like leg part, a second plate-like leg part forming cavity part that forms the second plate-like leg part, and a plate-like connecting part And a width of the first plate-shaped leg forming cavity portion corresponding to the plate thickness of the first plate-shaped leg portion. Is larger than the width of the plate-shaped connecting portion molding cavity corresponding to the plate thickness of the plate-shaped connecting portion, and the width of the plate-shaped connecting portion forming cavity corresponds to the thickness of the second plate-shaped leg portion. The vehicle resin according to the present invention is obtained by performing injection molding using an injection mold that is larger than or equal to the width of the second plate-shaped leg molding cavity. Parts are formed.

  For this reason, at the time of injection molding of the resin component for a vehicle according to the present invention, three molding cavity parts of the U-shaped part molding cavity (first plate-like leg part molding cavity part and second plate-like leg part molding cavity part) Among the plate-shaped connecting part molding cavity part), the flow velocity of the molten resin flowing in the first plate-like leg molding cavity part having the widest width and thereby the smallest flow resistance is the other two molding cavities. It is made larger than the flow rate of the molten resin flowing in the portion. When the width of the plate-shaped connecting portion molding cavity is larger than the width of the second plate-shaped leg forming cavity, the flow rate of the molten resin flowing in the plate-shaped leg forming cavity is It is made larger than the flow velocity of the molten resin which flows in the second plate-shaped leg portion molding cavity portion. Further, when the width of the plate-shaped connecting portion molding cavity portion is the same as the width of the second plate-shaped leg portion molding cavity portion, the flow rates of the molten resins flowing in the molding cavity portions are substantially the same. It becomes the size of. Furthermore, in the resin component for a vehicle according to the present invention, the flow of the molten resin flowing in the molding cavity for forming the U-shaped portion is caused to be opposed to the first plate-like leg portion and the second plate-like leg portion. The gate portion is set at a position where the flow is directed from one end portion of the plate-like connecting portion to the other end side in a direction perpendicular to both the plate thickness direction of the plate-like connecting portion.

  Therefore, in the resin component for a vehicle according to the present invention, at the time of injection molding, the flow of the molten resin in the first plate-shaped leg portion molding cavity portion causes the flow in the plate-shaped connecting portion molding cavity portion and the second plate. The flow always precedes the flow of the molten resin flowing in the shape leg forming cavity. Further, the flow of the molten resin in the plate-shaped connecting portion molding cavity portion precedes or substantially parallels the flow of the molten resin in the second plate-shaped leg portion molding cavity portion. Thereby, at the time of injection molding, generation | occurrence | production of the weld line in the design surface of a 1st plate-shaped leg part and the design surface of a plate-shaped connection part can be prevented advantageously. Moreover, even if a weld line occurs, the occurrence location is a location close to the non-design surface of the second plate-shaped leg portion, which is not so problematic on the design of the plate-shaped connecting portion. . As a result, it is possible to effectively avoid the appearance failure caused by the generation of the weld line on each design surface of the first plate-like leg portion and the plate-like connecting portion.

  Therefore, in the vehicle resin component according to the present invention as described above, a coating film or a plating that can conceal an appearance defect due to a weld line on each design surface of the first plate-like leg portion or the plate-like connecting portion. Even if a film such as a film is not formed, excellent appearance performance and sufficient design properties can be effectively ensured. As a result, for example, it can be applied very advantageously as a resin component for a vehicle made of an injection-molded product using a resin material.

  Even in the vehicle resin part injection molding die according to the present invention, substantially the same functions and effects as those exhibited in the vehicle resin parts according to the present invention can be enjoyed extremely effectively. It is.

It is front explanatory drawing which shows one Embodiment of the resin component for vehicles according to this invention. It is II arrow explanatory drawing of FIG. It is III arrow explanatory drawing of FIG. FIG. 4 is an explanatory diagram of an end surface in the IV-IV cross section of FIG. 2. FIG. 5 is an explanatory diagram of an end surface in a VV cross section of FIG. 2. It is longitudinal cross-sectional explanatory drawing which shows one Embodiment of the injection mold which has a structure according to this invention. It is VII-VII cross-sectional explanatory drawing of FIG. FIG. 8 is an explanatory view showing an example of a process performed when the resin part for a vehicle shown in FIG. 1 is molded using the injection mold shown in FIG. FIG.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 shows an inside handle of an automobile door as an embodiment of a resin component for a vehicle having a structure according to the present invention in its front form. FIG. 2 shows such an inside handle in its top form, and FIG. 3 shows such an inside handle in its side form. As is clear from these drawings, the inside handle 10 of the present embodiment is an integral injection-molded product having a longitudinal shape. Here, a polymer alloy of polycarbonate and ABS resin that exhibits sufficient strength is used as a resin material for forming the inside handle 10. In addition, an appropriate pigment is added to such a resin material, and the resin material is colored to a predetermined color, whereby the inside handle 10 can be formed in a desired manner without forming a coating film or the like on the surface. Colored. In addition, the material for forming the inside handle 10 is not limited to the example.

  And in the inside handle 10 of this embodiment, the one side part (right side part of FIG. 1 and FIG. 2) of the longitudinal direction (left-right direction of FIG.1 and FIG.2) is the attaching part 12 attached to a door. It is said that. In addition, the other side portion (the left side portion in FIGS. 1 and 2) is a handle portion 14 that is gripped by an automobile occupant when the door is opened and closed.

  As shown in FIGS. 1 to 4, the attachment portion 12 integrally includes a horizontal wall portion 13 a, a vertical wall portion 13 b, and a boss portion 18. And in this attaching part 12, one plate surface (upper surface in FIG.1 and FIG.3) of the horizontal wall part 13a and the plate surface of the vertical wall part 13b which continues to that are made into the design surface 16, respectively. Yes. Further, the boss portion 18 is integrally projected with a predetermined height at a substantially central portion of the design surface 16 of the lateral wall portion 13a, and a circular shaft hole 20 is formed at the center of the boss portion 18. ing

  Furthermore, in the attachment part 12, the gate part 22 is provided in the end surface (side surface of the horizontal wall part 13a) on the opposite side to the handle part 14 side of a length direction. The gate portion 22 is a cut mark that remains after removing the solidified gate portion in the injection gate that injects the molten resin into the molding cavity formed inside the injection mold when the inside handle 10 is injection-molded. It is a gate mark (gate trace). As is clear from this, in the inside handle 10 of the present embodiment, as will be described later, the molten resin injected into the molding cavity through the injection gate at the time of injection molding passes through the molding cavity into the mounting portion 12. From the molding cavity portion side forming the handle portion 14 toward the molding cavity portion side forming the handle portion, and is formed by being filled into the molding cavity and solidifying. .

  And the shaft member provided in the door which is not shown in figure is inserted in the shaft hole 20 of the attachment part 12, and the attachment part 12 is a vehicle of a door in the state which the design surface 16 of the attachment part 12 exposed to the vehicle interior. It can be attached to the indoor side surface. Thus, the inside handle 10 is attached to the door so as to be rotatable around the axis of the shaft member.

  On the other hand, as shown in FIGS. 1 to 3, the handle portion 14 includes a reinforcing portion 24 that is continuous with the mounting portion 12 and a rising portion 26 that rises at the end of the reinforcing portion 24 opposite to the mounting portion 12 side. Are integrated.

  The rising portion 26 of the handle portion 14 is a thick flat plate. And the thickness direction (vertical direction in FIG. 2) is the width direction of the inside handle 10 (vertical direction in FIG. 2), in other words, in the direction perpendicular to the thickness direction of the lateral wall portion 13a in the mounting portion 12. In the direction in which they match, one end surface (the lower end in FIG. 2) in the width direction of one plate surface (upper surface in FIG. 1) of the reinforcing portion 24 is integrally provided upright. Further, in the rising portion 26, both side plate surfaces and all side surfaces except for the side surface opposite to the design surface 16 side of the lateral wall portion 13 a of the mounting portion 12 are set as the design surface 28. Yes.

  As is clear from FIGS. 2 and 5, the reinforcing portion 24 has a substantially triangular shape in which the planar shape gradually narrows from the attachment portion 12 side in the longitudinal direction toward the opposite side. The vertical cross-sectional shape in the direction is a U-shape. That is, the reinforcing portion 24 includes a first plate-like leg portion 30 made of a plate material extending substantially straight along the longitudinal direction at one end in the width direction of the handle portion 14 where the rising portion 26 is erected, and a handle portion. 14 at the other end in the width direction (upper end in FIG. 2), a second plate-like leg portion 32 made of a plate material extending at an angle with respect to the longitudinal direction, and the first plate-like legs. A plate-like connecting portion 34 made of a substantially triangular plate material that connects the upper ends of the portion 30 and the second plate-like leg portion 32 is integrally provided. As is clear from this, in the present embodiment, the U-shaped portion is configured by the reinforcing portion 24 of the handle portion 14. The plate-like connecting portion 34 has an end in the width direction to which the second plate-like leg portion 32 is connected inclined obliquely downward, and the width of such an inclined portion is on the side of the attachment portion 12 in the longitudinal direction. It has a form gradually increasing toward the opposite side.

  Moreover, in this reinforcement part 24, the board surface (upper surface in FIG. 1) of the plate-shaped connection part 34 which continues with the design surface 16 of the horizontal wall part 13a of the attachment part 12, and the board of the 1st plate-shaped leg part 30 Among the surfaces, a plate surface continuous with the design surface 16 of the vertical wall portion 13b of the attachment portion 12, that is, a plate surface opposite to the side opposite to the second plate-like leg portion 32 is a design surface 36. It is said that.

In the present embodiment, the minimum thickness of the first plate-like leg portion 30 (the dimension indicated by t _{1 in} FIG. 5) in the reinforcing portion 24 and the minimum thickness of the second plate-like leg portion 32 ( The dimension indicated by t _{2 in} FIG. 5 and the minimum thickness of the plate-like connecting portion 34 (dimension indicated by t _{3 in} FIG. 5) are different from each other. Specifically, the minimum thickness of the first plate leg 30: t ₁ is the minimum thickness of the second plate leg 32: minimum thickness of t ₂ and the plate-like connecting part 34: t ₃ more, and the minimum thickness of the plate-like connecting part 34: t ₃ is, the minimum thickness of the second plate leg 32: is greater than t _2. In other words, the minimum thickness of the first plate leg 30: t ₁ and the minimum thickness of the second plate leg 32: minimum thickness of t ₂ and the plate-like connecting part 34: t ₃ and is, t _The size satisfies the relationship of ₁ > t ₃ > t ₂ . The minimum thickness of the plate-like connecting part 34: t ₃ the minimum thickness of the second plate leg 32: t ₂ and is, may be mutually the same size (t ₃ = t ₂₎ .

The minimum thickness of the first plate-like leg portion 30: t ₁ , the minimum thickness of the second plate-like leg portion 32: t ₂ and the minimum thickness of the plate-like connecting portion 34: t ₃ , the minimum thickness of the first plate leg 30: minimum thickness of t ₁ and the plate-like connecting portion 34: the difference between t _3, yet a minimum thickness of the plate-like connecting part 34: t ₃ a second the minimum thickness of the Itajoashi portion 32: the difference between t ₂ is not intended to be specifically limited, respectively, for example, whole and size of the reinforcement portion 24 and the inside handle 10, the injection of the inside handle 10 to be described later At the time of molding, it is appropriately changed depending on the fluidity derived from the temperature and viscosity of the molten resin injected into the molding cavity forming the inside handle 10.

  In the handle portion 14 having such a structure, the rising portion 26 protrudes into the vehicle interior in a state where the attachment portion 12 is rotatably attached to the surface of the door on the vehicle interior side. It is arranged so that. Thus, when the door is opened and closed, the rising portion 26 is gripped by the occupant and the inside handle 10 is rotated, and the reinforcing portion 24 ensures sufficient strength of the entire handle portion 14. It has come to be. Further, under the state where the inside handle 10 is attached to the door, the design surface 16 of the attachment portion 12 and the design surfaces 36 and 28 of the reinforcing portion 24 and the rising portion 26 in the handle portion 14 are visually observed by the occupant. Therefore, a good appearance can be obtained in the inside handle 10.

  Incidentally, as described above, the inside handle 10 of the present embodiment is molded by injection molding. In this case, for example, an injection molding die 38 having a structure as shown in FIG. 6 is used.

  That is, the injection molding die 38 shown in FIG. 6 is attached to a fixed die 42 attached to a fixed platen 40 that is fixed in position, and a movable platen 44 that can move toward and away from the fixed platen 40. The movable mold 46 is disposed opposite to the fixed mold 42.

  A cavity forming recess 48 is provided on the surface of the injection mold 38 facing the movable mold 46 of the fixed mold 42. The entire inner surface of the cavity forming recess 48 has a shape corresponding to the surface of the inside handle 10 including the design surface 16 of the mounting portion 12, the reinforcing portion 24 of the handle portion 14, and the design surfaces 36 and 28 of the rising portion 26. The fixed mold side cavity surface 50 is used. On the other hand, a cavity forming convex portion 52 that can enter the cavity forming concave portion 48 of the fixed die 42 is integrally provided on the surface of the movable die 46 that faces the fixed die 42. The entire outer surface of the cavity forming convex portion 52 is a movable mold side cavity surface 54 having a shape corresponding to the back surface of the inside handle 10.

  Then, the movable mold 46 and the fixed mold 42 are closed, and the cavity forming convex portion 52 of the movable mold 46 enters the cavity forming concave portion 48 of the fixed mold 42, whereby the fixed mold side cavity surface 50 and A molding cavity 56 having a shape corresponding to the outer shape of the inside handle 10 is formed between the movable mold side cavity surface 54.

  Further, such a molding cavity 56 includes a mounting portion molding cavity portion 58 having a shape corresponding to the outer shape of the mounting portion 12 of the inside handle 10 and a handle portion molding cavity having a shape corresponding to the outer shape of the handle portion 14. It consists of part 60. The handle forming cavity portion 60 includes a reinforcing portion forming cavity portion 62 having a shape corresponding to the outer shape of the reinforcing portion 24, and a rising portion forming cavity portion (not shown) having a shape corresponding to the outer shape of the rising portion 26. ) And. Further, as shown in FIG. 7, the reinforcing portion molding cavity portion 62 includes a first plate leg leg molding cavity portion 64 having a shape corresponding to the outer shape of the first plate leg portion 30, and the second plate leg leg cavity portion 64. The second plate-like leg forming cavity portion 66 having a shape corresponding to the outer shape of the plate-like leg portion 32 and the plate-like connecting portion forming cavity portion 68 having a shape corresponding to the outer shape of the plate-like connecting portion 34. It is made up of.

  In the present embodiment, in particular, the minimum widths of the first plate-like leg forming cavity part 64, the second plate-like leg forming cavity part 66, and the plate-like connecting part forming cavity part 68 are the first width. The plate-like leg portion 30, the second plate-like leg portion 32, and the plate-like connecting portion 34 are set so as to satisfy a specific relationship corresponding to the minimum thickness.

That is, as apparent from FIG. 7, in the injection mold 38, the design surface 36 and the non-design surface, which are plate surfaces on both sides of the first plate-like leg portion 30, of the movable mold side cavity surface 54. The minimum distance d ₁ between the two first plate-like leg forming cavity surface portions 70 a and 70 b that are arranged to face each other so as to form the first plate-like leg forming cavity 64. minimum width: there is a W _1. Also, two second plate-like leg portions that are arranged to face each other so as to form non-design surfaces made of plate surfaces on both sides of the second plate-like leg portion 32 of the movable mold side cavity surface 54 are formed. use cavity surface portion 72a, the minimum value of the distance between 72b: d ₂ is the minimum width of the second plate leg portion molding cavity portion 66: is a W _2. Further, two of the movable mold side cavity surface 54 and the fixed mold side cavity surface 50 that are arranged to face each other so as to form a design surface 36 and a non-design surface that are plate surfaces on both sides of the plate-like connecting portion 34. The minimum value: d ₃ of the distance between the two plate-like connecting portion forming cavity surface portions 74a, 74b is the minimum width: W _{3 of} the plate-like connecting portion forming cavity portion 68.

The minimum width of the first plate leg portion molding cavity portion 64: W ₁ is the minimum width of the second plate leg portion molding cavity portion 66: the minimum width of W ₂ and the plate-like connecting portion molding cavity portion 68 : greater than W _3, and the minimum width of the plate-like connecting portion molding cavity portion 68: W ₃ is the minimum width of the second plate leg portion molding cavity portion 66: is larger than W _2. In other words, the minimum width of the first plate leg portion molding cavity portion 64: the W _1, the second plate-like leg portion forming the minimum width of the cavity portion 66: the W _2, plate-like connecting portion molding cavity portion 68 uppermost Small width: W ₃ is set at a value satisfying the relationship of W ₁ > W ₃ > W ₂ . In other words, two first plate-like leg portion forming a cavity surface portion 70a, the minimum value of the distance between 70b: and d _1, two second plate leg portion forming a cavity surface portion 72a, between the 72b the minimum value of the distance: and d _2, the two plate-shaped connecting portion forming a cavity surface portion 74a, the minimum value of the distance between 74b: and d ₃ is the size that satisfies the relation of d _1> d _3> d ₂ Has been. Incidentally, the two second plate leg portion forming a cavity surface portion 72a, the minimum value of the distance between 72b: and d _2, the two plate-shaped connecting portion forming a cavity surface portion 74a, the minimum value of the distance between 74b : with a d ₃ is the same value, the minimum width of the second plate leg portion molding cavity portion 66: and W _2, the minimum width of the plate-like connecting portion molding cavity portion 68: and W ₃ are each other The same value may be used.

Thereby, in the injection mold 38, the minimum width: W _{2 of} the second plate-like leg forming cavity portion 66 and the minimum width of the plate-like connecting portion forming cavity portion 68: W ₃ at the time of injection molding as will be described later. The flow resistance of the molten resin in the first plate-like leg forming cavity portion 64 having a larger minimum width: W ₁ is configured to be the smallest. Thus, the molten resin flows in the first plate-like leg forming cavity portion 64 at a higher speed than in the second plate-like leg forming cavity portion 66 and the plate-like connecting portion forming cavity portion 68. It is supposed to be. Further, since the minimum width: W _{3 of} the plate-like connecting portion molding cavity portion 68 is made larger than the minimum width: W _{2 of} the second plate-like leg portion forming cavity portion 66, the molten resin becomes plate-shaped. The inside of the connecting portion forming cavity portion 68 flows at a higher speed than in the second plate-like leg forming cavity portion 66. The minimum width of the plate-like connecting portion molding cavity portion 68: W ₃ and the minimum width of the second plate leg portion molding cavity portion 66: in the case where W ₂ and are identical to each other, the molten resin, It flows in the plate-shaped connecting portion molding cavity portion 68 and the second plate-shaped leg portion molding cavity portion 66 at substantially the same speed.

Minimum width of the first plate-like leg forming cavity portion 64: W ₁ , Minimum width of the second plate-like leg forming cavity portion 66: W _2, and Minimum width of the plate-like connecting portion forming cavity portion 68: The size of W ₃ , the minimum width of the first plate-like leg forming cavity portion 64: the difference between W ₁ and the minimum width of the plate-like connecting portion forming cavity portion 68: W _3, and further the plate-like connecting portion forming cavity minimum width of the portion 68: W ₃ and the minimum width of the second plate leg portion molding cavity portion 66: the difference between W ₂ is not intended to be specifically limited, respectively, for example, the whole of the reinforcing portion 24 The size is appropriately changed depending on the fluidity derived from the temperature and viscosity of the molten resin injected into the molding cavity 56 at the time of injection molding of the inside handle 10.

  As shown in FIG. 6, in the injection molding die 38, the fixed platen 40 is provided with a sprue bush 76 that contacts a nozzle of an injection molding machine (not shown). A sub sprue 80 communicating with the sprue 78 of the sprue bushing 76 is formed so as to extend toward the movable die 46 with respect to the fixed die 42.

  Further, the fixed mold 42 is formed with injection gates 82 that open to the sub sprue 80 and the molding cavity 56, respectively. That is, the injection gate 82 has an opening on one side opening into the sub sprue 80, and the opening on the other side is the longitudinal direction of the mounting portion 12 in the fixed mold side cavity surface 50. Opening is made in a cavity surface portion 84 for mounting portion forming an end surface (side surface of the lateral wall portion 13a) which is a non-design surface opposite to the handle portion 14 side. Thereby, the sub sprue 80 and the mounting portion molding cavity portion 58 of the molding cavity 56 are communicated with each other through the injection gate 82.

  By the way, when the inside handle 10 is molded using the injection molding die 38 having such a structure, the molten resin injected from a nozzle of an injection molding machine (not shown) is first sprue 78 and sub sprue 80. And the injection gate 82 are led into the mounting portion molding cavity portion 58 of the molding cavity 56, and introduced from the mounting portion molding cavity 58 into the handle portion molding cavity portion 60. The molten resin introduced into the handle portion molding cavity portion 60 is reinforced with the reinforcing portion molding cavity portion 62 (the first plate leg leg molding cavity portion 64, the second plate leg leg molding cavity portion 66 and the plate). From the side of the mounting portion molding cavity portion 58 in the direction corresponding to the longitudinal direction of the inside handle 10 to be molded (the left-right direction in FIG. 6), the inside connecting portion molding cavity portion 68) and the rising portion molding cavity portion are formed. It is made to flow in the opposite direction.

  Here, as described above, the molten resin in the first plate-like leg forming cavity portion 64, in the second plate-like leg forming cavity portion 66, or in the plate-like connecting portion forming cavity portion 68, as described above. The injection mold 38 is configured to flow at a faster speed and in the plate-like connecting part molding cavity portion 68 to flow at a higher speed than in the second plate-like leg molding cavity portion 66. ing.

  Therefore, as shown in FIG. 8, the flow of the molten resin 86 in the first plate-shaped leg forming cavity portion 64 causes the flow in the plate-shaped connecting portion forming cavity portion 68 and the second plate-shaped leg forming portion. The flow always precedes the flow of the molten resin 86 flowing in the cavity portion 66. Further, the flow of the molten resin 86 in the plate-shaped connecting portion molding cavity portion 68 is a flow preceding the flow of the molten resin 86 in the second plate-shaped leg portion forming cavity portion 66.

Here, for example, the minimum width of the first plate leg portion molding cavity portion 64: W ₁ and the second minimum width of the plate-like leg portion molding cavity portion 66: the W ₂ and the plate-like connecting portion molding cavity portion 68 When the minimum width: W ₃ is set at a value satisfying the relationship of W ₁ <W ₃ <W ₂ , the flowing molten resin 86 is indicated by a two-dot chain line: a in FIG. The flow has such a tip. That is, the flow of the molten resin 86 in the second plate-shaped leg molding cavity portion 66 flows in the plate-shaped coupling portion molding cavity portion 68 and the first plate-shaped leg molding cavity portion 64, respectively. The flow always precedes the flow of the molten resin 86, and the flow of the molten resin 86 in the plate-like connecting portion forming cavity portion 68 is changed to the molten resin in the first plate-like leg forming cavity portion 64. The flow precedes the 86 flow. In such a case, for example, as shown by a two-dot chain line in FIG. 8, it flows in the second plate-shaped leg portion forming cavity portion 66 or the plate-like connecting portion forming cavity portion 68 to form the attachment portion. The molten resin 86 that has reached the cavity surface portion 88 for forming the handle portion facing the cavity surface portion 84 further flows along the cavity surface portion 88 for forming the handle portion, so that the first plate-shaped leg forming cavity is formed. The molten resin 86 flows in the portion 64 in the flow direction front side portion before the molten resin 86 flowing in the first plate-shaped leg molding cavity portion 64, and as a result, the first plate-shaped leg molding cavity is formed. In the portion 64, the molten resin 86 may merge and a weld line may be generated.

Further, for example, the minimum width of the plate-like connecting portion molding cavity portion 68: W ₃ is a first plate-shaped leg portion minimum width of the molding cavity portion 64: the W ₁ and second plate leg portion molding cavity portion 66 When the minimum width is smaller than W ₂ , that is, when W ₃ <W ₁ and W ₃ <W ₂ , the flowing molten resin 86 is shown by a two-dot chain line: U in FIG. The flow has a smooth tip. That is, the flow of the molten resin 86 in the first plate-shaped leg molding cavity portion 64 and the second plate-shaped leg molding cavity portion 66 is changed into the molten resin 86 in the plate-shaped coupling portion molding cavity portion 68. The flow always precedes the flow. In such a case, in the plate-like connecting portion molding cavity portion 68, the molten resin 86 flowing between the first plate-like leg portion molding cavity portion 64 side and the second plate-like leg portion molding cavity portion 66 side is joined. There is a possibility that a weld line will occur.

In contrast, the molten resin 86 flowing in the first and second plate-like leg forming cavity portions 64 and 66 and the plate-like connecting portion forming cavity portion 68 has a tip as shown by a solid line in FIG. In the case of the flow having, the joining of the molten resins 86 in the first plate-like leg forming cavity portion 64 and the plate-like connecting portion forming cavity portion 68 can be effectively avoided. The minimum width of the plate-like connecting portion molding cavity portion 68: W ₃ and the minimum width of the second plate leg portion molding cavity portion 66: in the case where W ₂ and are identical to each other, the plate-shaped connecting portion There is a possibility that the molten resin 86 may merge in the molding cavity portion 68, but the joining location is only a location biased toward the second plate-shaped leg portion molding cavity portion 66. Therefore, even if a weld line is generated by the joining of the molten resin 86 at such a location, such a weld line is not a design of the second plate-like leg portion 32 of the inside handle 10 finally obtained. Therefore, such a weld line does not greatly affect the design of the inside handle 10 as a whole.

  As described above, when injection molding is performed using the injection molding die 38 as shown in FIGS. 6 and 7, not only the design surface 16 of the mounting portion 12 but also the design surfaces 28 and 36 of the handle portion 14, The inside handle 10 which does not cause any appearance defect due to the weld line can be formed very advantageously.

  Therefore, in the inside handle 10 of the present embodiment formed as described above, a coating such as a coating film or a plating film capable of concealing the appearance defect due to the weld line on each design surface 16, 28, 36. Even if is not formed, excellent appearance performance and sufficient design properties can be effectively ensured. As a result, for example, a material-attached resin can be advantageously applied as a forming material. Therefore, the cost reduction based on the use of the material-attached resin and the effect of preventing the deterioration of the appearance performance due to long-term use are extremely effective. It will be able to be demonstrated.

  The specific configuration of the present invention has been described in detail above. However, this is merely an example, and the present invention is not limited by the above description.

  For example, in the above embodiment, only the reinforcing portion 24 of the inside handle 10 has a U-shaped cross section, so that only a part of the inside handle 10 has a U-shaped portion. As the U-shape, the entire inside handle 10 may be a U-shaped portion. As described above, in the injection molding die used for injection molding the inside handle 10 having the entire U-shaped portion, the entire shape of the molding cavity is a U-shape.

  Further, the formation position of the gate part for injection molding is not limited to the position formed in the embodiment, and the flow of the molten resin in the molding cavity for forming the U-shaped part by injection molding. The other end portion of the plate-like connecting portion in the direction perpendicular to both the opposing direction of the first plate-like leg portion and the second plate-like leg portion and the thickness direction of the plate-like connecting portion. Any position may be used as long as the flow is directed toward the side. Therefore, in a resin component for a vehicle in which only a part is a U-shaped part, it can be provided at any location other than the U-shaped part as long as the flow of the molten resin can be made as described above. May be. Moreover, in the vehicle resin part in which only a part or the whole is a U-shaped part, the opposing direction of the first plate-like leg part and the second plate-like leg part among the side faces of the plate-like connecting part A gate portion can be provided on a side surface facing in a direction perpendicular to the direction.

  In addition, the present invention provides various types of vehicle resin parts including injection-molded articles having U-shaped parts, as well as an injection mold for injection-molding the inside handle of an automobile door and injection-molding the same. Therefore, the present invention can be advantageously applied to an injection molding die.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

  Hereinafter, representative examples of the present invention will be shown to clarify the present invention more specifically. However, it is understood that the present invention is not restricted by the description of such examples. It should be.

First, a predetermined amount of a polymer alloy of polycarbonate and ABS resin was prepared. Further, as shown in FIGS. 6 and 7, the mold has a structure in which a mold cavity composed of a mounting part molding cavity part and a handle part molding cavity part is formed by closing the mold, and the handle part molding cavity part. The minimum width of the first plate-shaped leg molding cavity portion: W ₁ , the minimum width of the second plate-shaped leg molding cavity portion: W _2, and the minimum width of the plate-shaped joint molding cavity portion: W ₃ And injection molding dies each having a value satisfying the relationship of W ₁ > W ₃ > W ₂ were prepared. Furthermore, a known injection molding machine was also prepared.

Then, injection molding was performed by a known method using the prepared polycarbonate, a polymer alloy of ABS resin, an injection mold, and an injection molding machine. Accordingly, the structure shown in FIGS. 1 to 5 is provided, and the minimum thickness of the first plate-like leg portion: t ₁ and the minimum thickness of the second plate-like leg portion: t ₂ and the plate shape. Inside handles (examples) were obtained in which the minimum thickness of the connecting portion: t ₃ satisfies the relationship of t ₁ > t ₃ > t ₂ . In the inside handle of the embodiment thus obtained, the minimum thickness of the first plate-like leg portion: t ₁ is 4.45 mm, and the minimum thickness of the second plate-like leg portion: t ₂ is 2. 51 mm, the minimum thickness of the plate-like connecting portion: t ₃ was 2.98 mm.

For comparison, first, a predetermined amount of the same kind of polycarbonate and ABS resin polymer alloy as the material for forming the inside handle of the example was prepared. Then, like the injection mold used for injection molding the inside handle of the embodiment, a structure in which a molding cavity comprising an attachment molding cavity part and a handle molding cavity part is formed by closing the mold However, the minimum width of the first plate-shaped leg molding cavity portion in the handle molding cavity portion is W ₁ , the minimum width of the second plate-shaped leg molding cavity portion is W _2, and the plate-shaped connecting portion An injection mold was prepared in which the minimum width of the molding cavity portion: W ₃ was set to a value satisfying the relationship of W ₁ > W ₂ > W ₃ . Further, the same injection molding machine as that used for injection molding the inside handle of the example was prepared.

Then, injection molding was performed by a known method using the prepared polycarbonate, a polymer alloy of ABS resin, and an injection mold. Thereby, although it has the same overall shape as the inside handle of the embodiment, the minimum thickness of the first plate-like leg portion: t ₁ and the minimum thickness of the second plate-like leg portion: t ₂ and the plate-like connection The inside handle (comparative example), which was set at a value satisfying the relationship of t ₁ > t ₂ > t ₃ with the minimum thickness of the part: t ₃ , was obtained. In the inside handle of the comparative example thus obtained, the minimum thickness of the first plate-like leg: t ₁ is 4.78 mm, and the minimum thickness of the second plate-like leg: t ₂ is 4. 30 mm, the minimum thickness of the plate-like connecting portion: t ₃ was 2.64 mm.

  Next, using the inside handle of the example obtained as described above and the inside handle of the comparative example, whether or not a weld line was generated in these two types of inside handles was visually examined. As a result, in the inside handle of the comparative example, it was confirmed that a weld line was generated on the design surface of the plate-like connecting portion in the handle portion. On the other hand, in the inside handle of the example, no weld line was observed at any location. Thus, it can be clearly recognized that the inside handle having the structure according to the present invention has an appearance performance superior to that of the conventional inside handle.

DESCRIPTION OF SYMBOLS 10 Inside handle 12 Attachment part 14 Handle part 16,28,36 Design surface 22 Gate part 30 1st plate-shaped leg part 32 2nd plate-shaped leg part 34 Plate-shaped connection part 38 Injection mold 56 Molding cavity 64 1st One plate-like leg forming cavity portion 66 Second plate-like leg forming cavity portion 68 Plate-like connecting portion forming cavity portion 70a, 70b First plate-like leg forming cavity surface portion 72a, 72b Second plate Cavity surface portions 74a, 74b for forming plate-like leg portions Cavity surface portions for forming plate-like connecting portions 82 Injection gate 86 Molten resin

Claims (3)

The first plate-like leg portion and the second plate-like leg portion arranged to face each other, and the plate-like connecting portion for connecting the first plate-like leg portion and the second plate-like leg portion to each other are integrated. And having a U-shaped portion having a U-shaped cross section, and a plate surface of the first plate-like leg portion and a plate surface of the plate-like connecting portion in the U-shaped portion, Each is a design surface, the plate surface of the second plate-like leg portion is a non-design surface, is a resin component for a vehicle made of an injection molded product,
The plate thickness of the first plate-like leg portion: t ₁ , the plate thickness of the second plate-like leg portion: t _2, and the plate thickness of the plate-like connecting portion: t ₃ are t ₁ > t ₃ ≧ t ₂ , which are respectively set to values satisfying the relationship, and the flow of the molten resin in the molding cavity forming the U-shaped portion by injection molding is changed between the first plate-like leg portion and the first plate-like leg portion. At a position where the flow is directed from one end of the plate-like connecting part to the other end side in a direction perpendicular to both the direction of the plate-like connecting part and the thickness direction of the plate-like connecting part, A resin part for a vehicle, wherein a gate part for injection molding is provided.   The resin component for a vehicle according to claim 1, wherein the resin component for a vehicle is an inside handle of an automobile door. A first plate-like leg portion and a second plate-like leg portion arranged to face each other, and a plate-like connecting portion that integrally connects the first plate-like leg portion and the second plate-like leg portion to each other. And a plate surface of the first plate-like leg portion and a plate surface of the plate-like connecting portion in the U-shaped portion, Each is a design surface, while the second plate-like leg portion is a molding die used when injection molding a resin component for a vehicle in which the plate surface is a non-design surface,
A molding cavity having a shape corresponding to the U-shaped portion is formed inside, and between the two cavity surfaces that respectively provide plate surfaces on both sides of the first plate-shaped leg portion in the U-shaped portion. Distance: d ₁ , distance between two cavity surfaces that respectively provide the plate surfaces on both sides of the second plate-like leg portion: d _2, and two plates that respectively provide the plate surfaces on both sides of the plate-like connecting portion The distance between the cavity surfaces: d ₃ is set at a value satisfying the relationship of d ₁ > d ₃ ≧ d ₂ , and the molten resin injected into the molding cavity is The opposing directions of the two cavity surfaces that respectively provide the plate surfaces on both sides of the plate-like leg portion and the opposing directions of the two cavity surfaces that respectively provide the plate surfaces on both sides of the plate-like connecting portion are perpendicular to each other. One direction from one side to the other In, so as to flow through the molding cavity, the injection gate is provided an injection mold of a vehicle resin component, wherein.

Images