JP2018069526A - Structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure that enables a seat surface to be disposed at a desired position without deteriorating blow moldability.SOLUTION: There is provided a structure 10 comprising a blow molded article 5 and a separate member 6 which is separate from the blow molded article 5 and is fitted to the blow molded article 5. The blow molded article 5 includes a left hollow portion 12 and a right hollow portion 13 which are connected to each other by a plate-shaped central connecting portion 15b. The central connecting portion is disposed on a parting line of the blow molded article 5. The structure 10 includes a central seat surface between the left hollow portion 12 and the right hollow portion 13. The central connecting portion 15b is provided such that a groove 16 is formed between the left hollow portion 12 and the right hollow portion 13. The separate member 6 is fitted to the groove 6 such that the separate member 6 forms the central seat surface.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a structure such as an air conditioning duct.

  For example, in an air conditioner such as an automobile, a tubular air conditioning duct for allowing air to flow is used.

  As a method for manufacturing an air conditioning duct, a blow molding method in which a molten resin is clamped with a split mold and air is blown into the interior for expansion is widely known (see Patent Document 1).

Japanese Patent Laid-Open No. 2006-83859

  In the duct of Patent Document 1, there is one air supply port, and the air supplied from one supply port into the duct is branched into four duct portions, so the air discharged from the four duct portions. Have the same temperature. On the other hand, it may be required to individually control the temperature and flow rate of the air discharged from the four duct parts. In that case, as shown in FIGS. The structure which isolate | separates 1a-1d mutually and provides the supply ports 2a-2d in each may be employ | adopted. In such a configuration, the temperature and flow rate of the air supplied to each of the four supply ports 2a to 2d are individually controlled. Seat surfaces 3a to 3c for pressing the packing material between adjacent supply ports are provided so that air supplied to the supply ports 2a to 2d is not mixed.

  When forming a duct by blow molding, a parison is compressed with a metal mold to form compressed portions 4a to 4c, and seat surfaces 3a to 3c are formed by the compressed portions 4a to 4c. The compression parts 4a to 4c are formed on the parting line PL because they are formed by compressing the parison with a mold. Since the seat surfaces 3a to 3c are provided so as to be flush with the peripheral edges of the supply ports 2a to 2d, when the seat surfaces 3a to 3c are formed by the compression portions 4a to 4c, as shown in FIG. The parting line PL is provided at the lower ends of the duct portions 1a to 1d.

  By the way, in the cross section of FIG. 1C, when the outermost points of the opposing parting lines are connected by a straight line W, and the point T and the straight line W that are farthest from the straight line W are connected by a straight line V, the blow ratio = ( The blow ratio can be calculated according to the formula of (length of straight line V) / (length of straight line W). The greater the blow ratio calculated in this way, the greater the extent to which the parison is stretched locally during molding, making blow molding more difficult. In the example of FIG. 1C, since the straight line W is short and the straight line V is long, the blow ratio is very large. For this reason, the parison is not sufficiently stretched at the time of blow molding, and the parison is broken in a region outside the dotted line U (region having a high blow ratio) in FIG. A molded body may not be obtained.

  This invention is made | formed in view of such a situation, and provides the structure which can provide a seat surface in a desired site | part, without deteriorating blow moldability.

  According to the present invention, the blow molded body is a structure that is separate from the blow molded body and includes a separate member attached to the blow molded body, wherein the blow molded body is the blow molded body. A left hollow portion and a right hollow portion that are connected to each other by a plate-like central connecting portion provided on a parting line of the body, and the structure has a central seat between the left hollow portion and the right hollow portion. The central connecting portion is provided such that a groove is formed between the left hollow portion and the right hollow portion, and the separate member has the central seat surface formed by the separate member. A structure is provided for mounting in the groove.

  In the present invention, the connecting portion is formed so that a groove is formed between the left hollow portion and the right hollow portion, and the seating surface is formed by a separate member attached to the groove. Therefore, the blow moldability does not deteriorate. Moreover, since the seating surface is formed by the separate member, the seating surface can be provided at a desired site.

Hereinafter, various embodiments of the present invention will be exemplified. The following embodiments can be combined with each other.
Preferably, the separate member is fixed to the central connecting portion.
Preferably, the central connecting portion is provided such that the depth of the groove changes along the longitudinal direction of the central connecting portion.
Preferably, each of the left hollow portion and the right hollow portion includes an opening, and the center seating surface is provided at a position sandwiched between the opening of the left hollow portion and the opening of the right hollow portion.
Preferably, the central seat surface is provided on substantially the same plane as the periphery of the opening of the left hollow portion and the periphery of the opening of the right hollow portion.
Preferably, each of the left hollow portion and the right hollow portion has an inclined surface inclined along a longitudinal direction of the central connecting portion, and the central connecting portion is an inclined portion at a portion adjacent to the inclined surface. Is provided.
Preferably, each of the left hollow portion and the right hollow portion includes an opening, and the inclined surface is provided at a position facing the opening.
Preferably, the separate member includes a base portion that comes into contact with a peripheral edge of the groove.
Preferably, each of the left hollow portion and the right hollow portion includes an opening, and the periphery of the groove is provided at a position recessed from the periphery of the opening.
Preferably, the separate member includes a central wall, a left rib provided on one surface of the central wall and contacting the left hollow portion, and provided on the other surface of the central wall and the right hollow portion. The left rib and the right rib are provided so as to extend in the depth direction of the groove.
Preferably, the central connecting portion is formed by compressing a parison with a mold during blow molding.
Preferably, the separate member is an injection molded body.
Preferably, the blow molded body includes an outer hollow portion connected to the left hollow portion or the right hollow portion by a plate-like outer connecting portion provided on a parting line of the blow molded body, An outer seat surface is formed by the connecting portion, and the outer seat surface and the central seat surface are provided on substantially the same plane.
Preferably, the outer hollow portion, the outer connecting portion, and the outer seat surface are a left outer hollow portion, a left connecting portion, and a left seat surface, respectively, and the left outer hollow portion is parting of the blow molded body. A plate-like left connecting portion provided on the line is connected to the left hollow portion, and the blow molded body is a plate-like right connecting portion provided on the parting line of the blow molded body. And a right seat surface is formed by the right connector, and the right seat surface and the central seat surface are provided on substantially the same plane.

It is a figure for demonstrating the subject of this invention, (a) is a perspective view from upper direction, (b) is a perspective view from the downward direction, (c) is AA sectional drawing in (a). It is a perspective view from the upper part which shows the structure 10 of one Embodiment of this invention. It is a perspective view from the lower part of the structure 10 of FIG. It is a perspective view which shows the state which isolate | separated the separate member 6 in FIG. 3 from the blow molding body 5. FIG. It is BB sectional drawing in FIG. 4 is a perspective view of a separate member 6. FIG. FIG. 6 is a cross-sectional view corresponding to FIG. 5 with the separate member 6 removed. It is sectional drawing corresponding to CC cross section in FIG. 2 for demonstrating the parison formation process included in the manufacturing process of the blow molded body 5. FIG. It is sectional drawing corresponding to the CC cross section in FIG. 2 for demonstrating the blow molding process included in the manufacturing process of the blow molded object 5. FIG. It is sectional drawing corresponding to CC cross section in FIG. 2 which shows the state just before mounting the separate member 6 to the blow molded body 5. FIG. It is CC sectional drawing in FIG. 2 which shows the state after attaching the separate member 6 to the blow molded body 5. FIG.

  Hereinafter, embodiments of the present invention will be described. Various characteristic items shown in the following embodiments can be combined with each other. In addition, the invention is independently established for each feature.

  The structure and manufacturing method of the structure 10 according to an embodiment of the present invention will be described with reference to FIGS.

1. The structural body 10 of the structural body 10 is an air conditioning duct used for applications in which the characteristics (eg, temperature and flow rate) of air supplied to the hollow portions 11 to 14 through the openings 11a to 14a are individually controlled. . The structure 10 includes a blow molded body 5 and a separate member 6. The separate member 6 is separate from the blow molded body 5 and is attached to the blow molded body 5. The separate member 6 is, for example, an injection molded body.

  The blow molded body 5 includes a left outer hollow portion 11, a left hollow portion 12, a right hollow portion 13, and a right outer hollow portion 14. The hollow portions 11 and 12 are connected by a left connecting portion 15a. The hollow portions 12 and 13 are connected by a central connecting portion 15b. The hollow portions 13 and 14 are connected by a right connecting portion 15c. The left outer hollow portion 11 or the right outer hollow portion 14 is an “outer hollow portion” in the claims, and the left connecting portion 15a or the right connecting portion 15c is an “outer connecting portion” in the claims. The connection parts 15a-15c are plate-shaped, and are provided on the parting line PL of the blow molded body 5, as shown in FIGS.

  As shown in FIGS. 7 and 10, the central connecting portion 15 b is provided so that a groove 16 is formed between the hollow portions 12 and 13. Moreover, as shown in FIG. 7, the center connection part 15b is provided so that the depth of the groove | channel 16 may change along the longitudinal direction of the center connection part 15b. The separate member 6 is mounted in the groove 16.

  Openings 11a to 14a are provided in the hollow portions 11 to 14, respectively. The openings 11a to 14a are substantially square. A left seat surface 18a is provided so as to be sandwiched between the openings 11a and 12a, a center seat surface 18b is provided so as to be sandwiched between the openings 12a and 13a, and a right seat surface 18c is sandwiched between the openings 13a and 14a. Is provided. The seating surfaces 18a to 18c are surfaces used for the purpose of pressing the packing material, and are preferably flat surfaces but may be curved surfaces. The peripheral surfaces of the seat surfaces 18a to 18c and the openings 11a to 14a are provided on substantially the same plane. The left seat surface 18a or the right seat surface 18c is an “outer seat surface” in the claims. In the present specification, the two planes being substantially the same plane means a state in which the distance between the two planes is, for example, within 5 mm (preferably 4 mm, 3 mm, 2 mm, 1 mm).

  The hollow portions 11 to 14 are provided with inclined surfaces 11b to 14b at positions facing the openings 11a to 14a, and air supplied from the openings 11a to 14a is directed toward the back of the hollow portions 11 to 14. Guided. As shown in FIGS. 4-5, the center connection part 15b is provided with the inclination part 15b2 in the position adjacent to the inclined surfaces 12b and 13b.

  The left seat surface 18a and the right seat surface 18c are formed by the left connecting portion 15a and the right connecting portion 15c, respectively. That is, the bottom surfaces of the left connecting portion 15a and the right connecting portion 15c become the left seat surface 18a and the right seat surface 18c. On the other hand, the central seat surface 18 b is formed by the separate member 6.

  The separate member 6 includes a base portion 6a and an insertion portion 6b standing from the base portion 6a. The bottom surface 6a2 of the base portion 6a becomes the central seat surface 18b. The insertion portion 6 b is inserted into the groove 16. The insertion portion 6b is provided on the center wall 6c, the left rib 6f provided on one surface of the center wall 6c and in contact with the left hollow portion 12, and provided on the other surface of the center wall 6c and contacts the right hollow portion 13. A right rib 6d is provided. The left rib 6f and the right rib 6d are provided so as to extend in the depth direction of the groove 16. The left rib 6f and the right rib 6d are provided with tapered surfaces 6g. With this configuration, the frictional resistance when the separate member 6 is inserted into the groove 16 is reduced.

  An engaging portion 6e is provided in the central wall 6c. Two engaging portions 6e are provided. As shown in FIG. 7, a mounting hole 15b1 is provided in the central connecting portion 15b. The separate member 6 is fixed to the central connecting portion 15b by inserting the insertion portion 6b into the groove 16 and engaging the engaging portion 6e with the mounting hole 15b1. As shown in FIGS. 8 to 9, the central connecting portion 15 b is a portion formed by compressing the parison 21 with the molds 23 and 24 during blow molding, and thus has excellent strength and dimensional accuracy. For this reason, the separate member 6 is stably mounted by fixing the separate member 6 to the central connecting portion 15b.

  As shown in FIG.7 and FIG.10, the peripheral edge 16a of the groove | channel 16 is provided in the position dented from the peripheral surfaces of the seating surfaces 18a-18c and the opening parts 11a-14a. Since this dent amount is substantially the same as the thickness of the base portion 6a, when the separate member 6 is mounted in the groove 16 so that the upper surface 6a1 of the base portion 6a contacts the peripheral edge 16a, the bottom surface of the base portion 6a (ie , A central seat surface) 6a2 is arranged on substantially the same plane as the left seat surface 18a and the right seat surface 18c.

2. Manufacturing Method of Structure 10 The structure 10 can be manufactured by mounting the separate member 6 on the blow molded body 5.

2.1 Production of Blow Molded Body 5 The blow molded body 5 can be formed by a parison forming process, a blow molding process, and a post-processing process. Hereinafter, each step will be described in detail.

(1) Parison forming step In the parison forming step, as shown in FIG. 8, the molten resin is extruded from the head and dropped to form the parison 21, and the parison 21 is disposed between the molds 23 and 24. The shape of the parison 21 is not particularly limited, and may be a cylindrical shape or a sheet shape. The parison 21 may be a solid parison or a foam parison. The mold 23 includes protrusions 23a to 23c in a cavity surrounded by the pinch-off portion 23d. The mold 24 includes protrusions 24a to 24c in a cavity surrounded by the pinch-off portion 24d.

(2) Blow molding process In the blow molding process, after the molds 23 and 24 are clamped, air is blown into the parison 21 to shape the parison 21 into a shape along the cavity inner surfaces of the molds 23 and 24. Thus, a blow molded body with burrs is formed. When the parison 21 is a cylindrical parison, pre-blow may be performed before mold clamping, and when the parison 21 is a resin sheet, the resin sheet may be vacuum sucked into the mold before mold clamping. In the clamped state, the protrusions 23a and 24a face each other with an interval corresponding to the thickness of the connecting portion 15a, and the protrusions 23b and 24b face each other with an interval corresponding to the thickness of the connecting portion 15b. 24c opposes with the space | interval equivalent to the thickness of the connection part 15c. Since this interval is smaller than the thickness of the parison 21, the parison 21 is compressed by the projections 23a to 23c and 24a to 24c to form the connecting portions 15a to 15c.

(3) Post-processing step Since the burr-formed product with burr formed in the blow molding step is provided with the burr 25 and the discard bag 26, the burr 25 and the discard bag 26 are removed in the post-processing step, A blow molded body 5 having the configuration shown in FIG. 10 is obtained. In the cross section of the blow molded body 5 in FIG. 10, the straight lines W and V are as shown in FIG. As is clear from a comparison between FIG. 10 and FIG. 1 (c), in the blow molded body 5 of the present embodiment, the connecting portion 15 b is formed so that the groove 16 is formed between the hollow portions 12 and 13. Therefore, the straight line W becomes longer and the length of the straight line V becomes shorter than the example of FIG. 1, and as a result, the blow ratio defined by (the length of the straight line V) / (the length of the straight line W). Becomes smaller. For this reason, the required stretch amount of the parison 21 when forming the blow molded body 5 is reduced, and the blow moldability is improved.

2.2 Mounting of Separate Member 6 In this step, the separate member 6 is mounted on the blow molded body 5 as shown in FIGS. The separate member 6 is preferably formed by resin injection molding, but may be formed by another method. As shown in FIG. 10, the projected external shape of the insertion portion 6 b of the separate member 6 substantially matches the inner shape of the groove 16, so that the groove 16 is separated by inserting the separate member 6 into the groove 16. Filled by body member 6. When the separate member 6 is pushed into the groove 16, as shown in FIGS. 5 to 7, the engaging portion 6 e of the separate member 6 is engaged with the mounting hole 15 b 1 and the upper surface 6 h of the insertion portion 6 b is connected to the center. The base member 6 a comes into contact with the peripheral edge 16 a of the groove 16 and the separate member 6 is attached to the groove 16 while making contact with the portion 15 b. The bottom surface 6a2 of the base portion 6a of the separate member 6 becomes the central seat surface 18b.

  As described above, according to the present embodiment, a seating surface can be provided at a desired site without deteriorating blow moldability.

The present invention can also be implemented in the following modes.
In the above embodiment, the blow molded body 5 includes four hollow portions and three connection portions, but the hollow portions 11 and 14 and the connection portions 15a and 15c can be omitted.
-In the said embodiment, although the opening part is provided in each hollow part, this invention is applicable also to the form which does not have an opening part in a hollow part.

DESCRIPTION OF SYMBOLS 1a-1d: Duct part 2a-2d: Supply port 3a-3c: Seat surface 4a-4c: Compression part 5: Blow molded body 6: Separate member 6a: Base part 6b of a separate member: Insert part of a separate member 10: Structure 11: Left outer hollow portion 12: Left hollow portion 13: Right hollow portion 14: Right outer hollow portions 11a to 14a: Opening portions 11b to 14b: Inclined surface 15a: Left connecting portion 15b: Central connecting portion 15b1: Mounting hole 15b2 in the central connecting portion: inclined portion 15c in the central connecting portion: right connecting portion 16: groove 16a: peripheral edge 18a of the groove: left seat surface 18b: central seat surface 18c: right seat surface 21: parison 23: mold 23a -23c: Protrusion 23d: Pinch-off part 24: Die 24a-24c: Protrusion 24d: Pinch-off part 25: Burr 26: Disposal bag PL: Parting line

Claims (14)

The blow molded body and the blow molded body are separate bodies and a structure including a separate member attached to the blow molded body,
The blow molded body includes a left hollow portion and a right hollow portion that are connected to each other by a plate-like central connecting portion provided on a parting line of the blow molded body,
The structure includes a central bearing surface between the left hollow portion and the right hollow portion,
The central connecting portion is provided such that a groove is formed between the left hollow portion and the right hollow portion,
The separate member is a structure that is attached to the groove such that the central seat is formed by the separate member.   The structure according to claim 1, wherein the separate member is fixed to the central connecting portion.   The structure according to claim 1, wherein the central coupling portion is provided such that a depth of the groove changes along a longitudinal direction of the central coupling portion. The left hollow portion and the right hollow portion each include an opening,
The structure according to any one of claims 1 to 3, wherein the central seating surface is provided at a position sandwiched between the opening of the left hollow portion and the opening of the right hollow portion.   The structure according to claim 4, wherein the central seating surface is provided on substantially the same plane as a peripheral edge of the opening of the left hollow part and a peripheral edge of the opening of the right hollow part.   The left hollow portion and the right hollow portion each have an inclined surface that is inclined along the longitudinal direction of the central connecting portion, and the central connecting portion includes an inclined portion at a portion adjacent to the inclined surface. The structure according to any one of claims 1 to 5. The left hollow portion and the right hollow portion each include an opening,
The structure according to claim 6, wherein the inclined surface is provided at a position facing the opening.   The said separate member is a structure as described in any one of Claims 1-7 provided with the base part contact | abutted to the periphery of the said groove | channel. The left hollow portion and the right hollow portion each include an opening,
The structure according to claim 8, wherein a peripheral edge of the groove is provided at a position recessed from a peripheral edge of the opening.   The separate member includes a central wall, a left rib provided on one surface of the central wall and contacting the left hollow portion, and provided on the other surface of the central wall and contacting the right hollow portion. The structure according to claim 1, further comprising a right rib, wherein the left rib and the right rib are provided so as to extend in a depth direction of the groove.   The said center connection part is a structure as described in any one of Claims 1-10 formed by compressing a parison with a metal mold | die at the time of blow molding.   The structure according to any one of claims 1 to 11, wherein the separate member is an injection-molded body. The blow molded body includes an outer hollow portion connected to the left hollow portion or the right hollow portion at a plate-like outer connecting portion provided on a parting line of the blow molded body,
An outer seating surface is formed by the outer connecting portion,
The structure according to any one of claims 1 to 12, wherein the outer seat surface and the central seat surface are provided on substantially the same plane. The outer hollow portion, the outer connecting portion, and the outer seat surface are respectively defined as a left outer hollow portion, a left connecting portion, and a left seat surface,
The left outer hollow portion is connected to the left hollow portion by a plate-like left connecting portion provided on a parting line of the blow molded body,
The blow molded body includes a right outer hollow portion connected to the right hollow portion by a plate-like right connecting portion provided on a parting line of the blow molded body,
A right seat surface is formed by the right connecting portion,
The structure according to claim 13, wherein the right seat surface and the central seat surface are provided on substantially the same plane.