WO2014174921A1 - 車両用樹脂部品及びその製造方法 - Google Patents
車両用樹脂部品及びその製造方法 Download PDFInfo
- Publication number
- WO2014174921A1 WO2014174921A1 PCT/JP2014/056105 JP2014056105W WO2014174921A1 WO 2014174921 A1 WO2014174921 A1 WO 2014174921A1 JP 2014056105 W JP2014056105 W JP 2014056105W WO 2014174921 A1 WO2014174921 A1 WO 2014174921A1
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- WIPO (PCT)
- Prior art keywords
- resin
- end portion
- rib
- resin component
- reinforcing rib
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
- B62D29/04—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of synthetic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0046—Details relating to the filling pattern or flow paths or flow characteristics of moulding material in the mould cavity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
- B29C45/376—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings adjustable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/02—Side panels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
- B29C2045/0043—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks preventing shrinkage by reducing the wall thickness of the moulded article
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2101/00—Use of unspecified macromolecular compounds as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3005—Body finishings
Definitions
- the present invention relates to a resin component for a vehicle in which reinforcing ribs are erected on the inner surface of a panel body having a design surface, and a method for manufacturing the same.
- the present invention relates to a resin component for a vehicle in which the thickness of the base end portion of a reinforcing rib is made thinner than the thickness of the tip portion, and a manufacturing method thereof.
- the thickness of the base end of the reinforcing rib is reduced to reduce sink marks, and the thickness of the distal end of the reinforcing rib is increased to increase the rigidity of the resin component for the vehicle. It is being considered.
- Patent Document 1 includes a main body portion (corresponding to a panel main body) that forms the surface of a vehicle, and a reinforcing rib that extends and projects in the surface direction on the back surface of the main body portion to reinforce the main body portion.
- the reinforcing rib is provided with a thinned portion with a reduced thickness at the base end that is the base of the rib, and has an inclined shape that is inclined with respect to the rib extending direction.
- a resin exterior part for a vehicle characterized by the above.
- the inclination is inclined with respect to the rib extending direction. Since it has a shape, it is possible to prevent the reinforcement rib from falling and ensure the rigidity of the resin exterior part of the vehicle.
- Patent Document 2 in a molding method of an injection molded product in which a reinforcing rib is formed inside a corner portion where two surfaces of a product intersect, the flow velocity of resin flowing through the reinforcing rib with the thickness of the reinforcing rib being reduced.
- An injection molding method that does not generate a weld line on the product visible surface by controlling the above is disclosed.
- JP 2009-29252 A Japanese Patent Laid-Open No. 11-77767
- Patent Documents 1 and 2 have the following problems. That is, in the technique of Patent Document 1, when the molten resin filled in the cavity of the main body portion flows from the main body portion to the distal end portion via the proximal end portion of the reinforcing rib, the thinned portion is thinned. Since the flow velocity becomes slow, the timing for filling the thick tip is delayed. Further, since the tip portion has a large volume and a large heat capacity, the solidification timing of the molten resin filled in the tip portion becomes later than the solidification timing of the molten resin in the main body portion, and the tensile force accompanying the resin contraction of the tip portion is increased. There was a problem of increasing sink marks in the main body.
- the reinforcing rib is supported on two surfaces of the product of the corner portion, and when the injection molded product is released after the injection molding, the reinforcing rib is difficult to bend in the direction orthogonal to the rib extending direction. It has become. Therefore, when the mold is opened after injection molding and the injection molded product is released, unless a complicated mold structure such as sliding the slide piece for forming the thin wall portion in the lateral direction or the tilting direction intersecting the mold opening direction is adopted. The reinforcing rib interferes with the slide piece, and there is a problem that sink and distortion occur on the outer surface of the main body.
- the present invention has been made to solve the above-described problems, and reduces the sink and the like of the panel body with a simple structure or method, thereby realizing thinning and high rigidity of the panel body and the reinforcing rib. It aims at providing the resin component for vehicles, and its manufacturing method.
- One aspect of the present invention for solving the above problems is that a panel main body having a design surface and an inner surface of the panel main body are erected, and the thickness of the base end is thinner than the thickness of the front end
- a resin component for a vehicle comprising a stepped reinforcing rib formed at a side end portion of a rib extending direction terminal, wherein the distal end portion has a molten resin preceding the base end portion.
- the purpose of this is to form a resin supply port through which water is supplied.
- a rib height of the stepped reinforcing rib from the inner side surface of the panel main body to the lower end of the tip end portion is provided as a resin supply path communicating with the resin supply port. It is preferable to form along a direction.
- the resin supply path has a rib height by partially increasing the thickness of the base end portion in the rib extending direction of the stepped reinforcing rib. It is preferable to extend in the direction.
- the front and rear width and the left and right width of the resin supply path are 1.5 to 2. It is preferably 5 times.
- the front-rear width means the width in the direction orthogonal to the rib extending direction of the stepped reinforcing rib
- the left-right width means the width of the stepped reinforcing rib in the rib extending direction.
- the resin supply path is formed intermittently in a rib extending direction of the stepped reinforcing rib. preferable.
- the lower end of the distal end portion is tapered so that the thickness gradually decreases toward the proximal end portion.
- the base end portion gradually becomes thinner from the lower end of the tip end portion and is joined to the panel body. It is preferable that the base is formed in a tapered shape so that the thickness on the base side is minimized.
- a gusset rib to be joined to the panel body is provided on the base side of the base end portion. It is preferable to form intermittently in the extending direction.
- the gusset rib is a rib that partially reinforces only the base side close to the panel body in the rib extending direction of the stepped reinforcing rib.
- the stepped reinforcing ribs are extended and spaced apart from each other substantially in parallel.
- the injection mold of the resin component for a vehicle has an undercut shape with respect to a mold opening direction of the stepped reinforcing rib. It is preferable that a slide piece for forming a negative angle portion is provided, and the slide piece is movable in a direction close to the panel body in accordance with resin contraction in the rib height direction of the stepped reinforcing rib.
- the slide piece is connected to an elevating plate that moves up and down in a mold opening direction of a lifter device provided in the injection mold through an elastic body. It is preferable that
- the elastic body urges the slide piece in a direction approaching the lift plate.
- the present invention it is possible to provide a resin component for a vehicle and a method of manufacturing the same that reduce sink marks and the like of the panel body with a simple mold structure and realize thinning and high rigidity of the panel body and the reinforcing rib. it can.
- FIG. 1 It is a fragmentary perspective view of the resin component for vehicles which is an embodiment concerning the present invention. It is the A section detailed perspective view of the resin component for vehicles shown in FIG. It is a side view of the stepped reinforcement rib and resin supply path shown in FIG. It is the perspective view which displayed typically the flow of the molten resin supplied to the stepped reinforcement rib and resin supply path shown in FIG. It is a fragmentary sectional view of the resin mold which shape
- FIG. 1 the fragmentary perspective view of the resin component for vehicles which is embodiment which concerns on this invention is shown.
- FIG. 2 is a detailed perspective view of a portion A of the vehicle resin component shown in FIG.
- FIG. 3 shows a side view of the stepped reinforcing rib and the resin supply path shown in FIG.
- the vehicle resin component 10 includes a panel body 1, a stepped reinforcing rib 2, a resin supply path 3, and a gusset rib 4.
- the panel body 1 is a thin-walled (thickness is about 2 mm) provided with a general part 13 having a relatively small cross-sectional curvature constituting the design surface, a curved part 14 having a relatively large cross-sectional curvature, and ridge lines 15 and 16. It is a plate-like body.
- the ridge line portions 15 and 16 correspond to a character line (15) in design, a parting line (16) of a component terminal, and the like.
- the parting line (16) is provided with a gate for supplying the molten resin into the cavity of the mold.
- a plurality of stepped reinforcing ribs 2 having an undercut shape formed on one side surface 224 are erected on the inner side surface 11 of the general portion 13 in the panel body 1.
- the stepped reinforcing rib 2 is a step-shaped reinforcing rib in which the thickness of the base end portion 21 joined to the inner side surface 11 of the panel body 1 is thinner than the thickness of the distal end portion 22.
- the cross section of the stepped reinforcing rib 2 is substantially constant in the rib extending direction (the direction of the arrow X).
- a side end portion 23 which is a terminal of the stepped reinforcing rib 2 in the rib extending direction (direction of arrow X) is open near the boundary of the general portion 13 in the panel body 1.
- the side end portion 23 is formed so as to intersect the inner side surface 11 of the panel body 1 substantially perpendicularly.
- a plurality of stepped reinforcing ribs 2 are provided so as to be spaced apart from each other substantially in parallel.
- the interval between the plurality of stepped reinforcing ribs 2 increases or decreases according to the cross-sectional curvature of the general portion 13 to be erected. If the cross-sectional curvature of the general portion 13 is relatively small, the interval between the stepped reinforcing ribs 2 is narrowed. If the cross-sectional curvature of the general portion 13 is relatively large, the interval between the stepped reinforcing ribs 2 is widened.
- the stepped reinforcing rib 2 is formed in a substantially linear shape in the rib extending direction (the direction of the arrow X), but can be greatly curved along the ridge line portion 15 of the panel body 1.
- the wall thickness f on the base side 212 of the base end portion 21 is formed to the minimum (ultra thin) to a predetermined height d, and is joined to the lower end 222 of the tip end portion 22.
- the thickness e of 211 is slightly thicker than the thickness f of the root side 212.
- the thickness f on the root side 212 is preferably about 0.3 to 0.4 mm, and the thickness e on the upper end side 211 is preferably about 0.41 to 0.6 mm.
- the height c of the base end portion is about 3.0 mm, and the height d of the base side 212 is about 0.5 mm.
- the lower end 222 of the distal end portion 22 is formed in a tapered shape so that the thickness gradually decreases toward the proximal end portion 21.
- the inclination angle i with respect to the horizontal direction of the tapered lower end 222 is preferably about 45 degrees.
- the distal end portion 22 increases the thickness a when the height b is reduced, and decreases the thickness a when the height b is increased.
- the wall thickness a is about 2.0 mm.
- the thickness a is about 3.0 mm.
- the upper end 221 of the tip 22 is formed substantially parallel to the inner surface 11 of the panel body 1.
- a curved surface is formed at the corner portion 223 where the upper end 221 of the distal end portion 22 and the other side surface 225 opposite to the one side surface 224 forming the undercut shape intersect.
- the molten resin supplied from the resin supply path 3 to the distal end portion 22 can be guided to flow toward the base end portion 21 along the other side surface 224.
- a resin supply port 32 through which molten resin is supplied to the distal end portion 22 via a resin supply path 3 described later is formed at the lower end 222 of the distal end portion 22.
- the resin supply path 3 is configured so that the molten resin supplied from the gate into the mold cavity of the panel body 1 precedes the base end portion 21 at the tip end portion 22 of the stepped reinforcing rib 2. And it is a hot water supply path.
- the resin supply path 3 is formed to project forward from the gate of the molten resin flowing in the cavity of the panel body 1 from the gate.
- the resin supply path 3 is formed along the base end portion 21 from the joint portion 31 with the inner surface 11 of the panel main body 1 to the lower end 222 of the distal end portion 22 of the stepped reinforcing rib 2, and communicates with the resin supply port 32. Yes.
- the resin supply path 3 is formed by partially increasing the thickness of the base end portion 21 on the undercut side and extending in the rib height direction (the direction of the arrow Z).
- the resin supply path 3 is formed at a predetermined interval in the rib extending direction (the direction of the arrow X), and when releasing from the mold after the injection molding, the step (the arrow) is orthogonal to the rib extending direction together with the stepped reinforcing rib 2. Y direction).
- the front-rear width g (see FIG. 3) in the direction perpendicular to the rib extending direction of the resin supply path 3 (the direction of arrow Y) is the rib extending direction of the molten resin supplied to the tip portion 22 (the direction of arrow X).
- the front-rear width g of the resin supply path 3 is preferably about 1.5 to 2.5 times the thickness f of the base side 212 of the base end 21, for example, the base side 212 of the base end 21.
- the front-rear width g of the resin supply path 3 is preferably about 0.5 to 0.7 mm.
- the left-right width of the resin supply path 3 in the rib extending direction is approximately the same as the front-rear width g.
- the gusset rib 4 is a triangular reinforcing rib that connects the base side 212 of the base end 21 and the inner side surface 11 of the panel body 1.
- the gusset ribs 4 are formed at predetermined intervals in the rib extending direction (the direction of the arrow X).
- the thickness of the gusset rib 4 is approximately equal to or less than the thickness f of the base side 212 of the base end portion 21.
- the gusset rib 4 preferably has a shape that reduces the heat capacity of the base side 212 of the base end portion 21 so that sink marks generated on the outer surface 12 of the panel body 1 are less noticeable.
- the length h of the base of the triangle in the gusset rib 4 may be equal to or less than the height d of the base side 212 of the base end portion 21 and the hypotenuse may have a linear shape or a curved concave shape.
- the gusset rib 4 may be formed with a predetermined interval from the resin supply path 3.
- the height of the gusset rib 4 is approximately the same as the height d of the base side 212 that minimizes the thickness of the base end portion 21 (very thin).
- the base side 212 of the base end part 21 which is a junction part with the inner surface 11 of the panel main body 1 can be reinforced.
- the standing state of the stepped reinforcing rib 2 by the gusset rib 4 at the time of releasing after injection molding, only the direction above the base side 212 of the base end portion 21 is perpendicular to the rib extending direction (arrow). Y direction). Even at the time of mold release after injection molding, the standing state of the stepped reinforcing rib 2 is held by the gusset rib 4, so that sink marks and distortion of the outer surface 12 of the panel body 1 can be reduced.
- FIG. 4 is a perspective view schematically showing the flow of the molten resin supplied to the stepped reinforcing rib and the resin supply path shown in FIG.
- molten resin flows in the cavity of the panel body 1 in the direction of arrow F1.
- the direction of the arrow F1 is a direction orthogonal to the rib extending direction of the stepped reinforcing rib 2.
- the molten resin flowing in the cavity of the panel body 1 flows in the direction of the arrow F2 through the resin supply path 3 formed so as to protrude forward of the resin flow, and precedes the base end portion 21 to the front end from the resin supply port 32.
- the molten resin supplied from the resin supply port 32 to the tip portion 22 flows in the directions of arrows F3 and F4 (rib extending direction) and fills the tip portion 22. At this time, the molten resin can move quickly and smoothly in the direction of the arrows F3 and F4 (rib extending direction) along the tapered lower end 222.
- the molten resin supplied to the distal end portion 22 flows in the directions of arrows f1 to f4 at different positions in the rib extending direction, and flows into the proximal end portion 21 substantially equally.
- the base end portion 21 is tapered so that the thickness gradually decreases from the lower end 222 of the distal end portion 22 and the thickness of the base side 212 joined to the panel body 1 is minimized (ultra thin).
- the molten resin that has flowed in the directions of the arrows f1 to f4 finally reaches the root side 212 where the thickness is minimum (ultra-thin).
- the molten resin flowing through the panel body 1 in the directions (surface directions) of the arrows f5 to f8 is formed to have a minimum thickness (extremely thin) and flows into the base side 212 where the inflow resistance is greater than that of the resin supply path 3. Hateful.
- the molten resin that has flowed from the front end portion 22 in the directions of the arrows f1 to f4 and reached the root side 212 joins the molten resin flowing in the directions (surface directions) of the panel body 1 in the directions of the arrows f5 to f8. Then, coagulation is started.
- the solidification timing is later than the solidification timing of the molten resin at the tip portion 22.
- the tensile force accompanying the resin shrinkage at the distal end portion 22 having a large heat capacity is canceled at the base side 212 of the proximal end portion 21 where the solidification timing is delayed, and the influence on the panel body 1 can be further avoided.
- the sink marks generated on the outer surface 12 of the panel body 1 can be further reduced.
- FIG. 5 is a partial cross-sectional view of a resin molding die for molding the vehicle resin component shown in FIG.
- FIG. 6 is a schematic cross-sectional view relating to the slide piece of the resin mold shown in FIG.
- FIG. 7 is an operation explanatory diagram of the slide piece shown in FIG.
- FIG. 8 is a partial perspective view showing the nested structure of the resin mold shown in FIG.
- the injection mold 5 for injection molding a vehicle resin part has a lifter device for releasing the fixed mold 51, the movable mold 52 and the injection molded product w. 55.
- the lifter device 55 moves up and down in the mold opening direction of the movable mold 52.
- the injection molded product w has a panel body w1 and a stepped reinforcing rib w2.
- the movable mold 52 includes a slide piece 53 that forms a negative angle portion w2c that is undercut with respect to the mold opening direction of the stepped reinforcing rib w2, and a panel receiving member 54 that abuts against the inner surface of the panel body w1.
- the slide piece 53 is connected to the lifting plate 551 of the lifter device 55 via a spring member 554 (elastic body).
- a first connecting member 531 is formed at the lower end of the slide piece 53.
- a spring receiving member 553 is connected to the lower end of the first connecting member 531 by a connecting pin 552.
- a lower end 531T of the first connecting member 531 is in contact with an upper end 551T of the elevating plate 551.
- the connecting pin 552 is fixed to the lower end 531T of the first connecting member 531 and protrudes downward from a through hole 551H that penetrates the elevating plate 551.
- the lower end of the connecting pin 552 is connected to the spring receiving member 553.
- a spring member 554 is sandwiched between the lower end 551B of the elevating plate 551 and the spring receiving member 553.
- a second connecting member 541 is formed at the lower end of the panel receiving member 54. The second connecting member 541 is fixed to the lifting plate 551.
- the slide piece 53 and the panel receiving member 54 rise simultaneously.
- the injection molded product w can be released from the movable mold 52 without being deformed.
- a conveying device (not shown) holds the injection molded product w and separates from the slide piece 53.
- the slide piece 53 is connected to the lifting plate 551 of the lifter device 55 while being urged in the direction of the arrow M through the spring member 554.
- the biasing force of the spring member 554 is set to a sufficiently small force as compared with the tensile force when the molten resin of the stepped reinforcing rib w2 is cooled and the volume is contracted. Therefore, the slide piece 53 can move in the direction of the arrow L following the resin contraction of the stepped reinforcing rib w2.
- the tensile force accompanying the resin shrinkage of the stepped reinforcing rib w2 is hardly applied to the outer surface of the panel main body w1, and sink marks generated on the outer surface of the panel main body w1 can be greatly reduced.
- the tensile force hardly acts on the base end portion w2a of the stepped reinforcing rib w2
- the possibility of breakage is greatly increased even if the thickness of the base end portion w2a of the stepped reinforcing rib w2 is reduced. Can be reduced.
- the spring member 554 is biased in the direction in which the slide piece 53 approaches the lifting plate 551 (the direction of the arrow M). Therefore, when the molten resin is injected into the cavity w10 of the panel body w1, the slide piece 53 does not protrude into the cavity w10 of the panel body w1.
- the lower end 531T of the first connecting member 531 formed at the lower end of the slide piece 53 is in contact with the upper end 551T of the elevating plate 551. Therefore, when the molten resin is injected into the cavity w10 of the panel main body w1, the slide piece 53 does not move downward to expand the cavity w10 of the panel main body w1.
- the slide piece 53 does not obstruct the flow of the molten resin in the cavity w10 of the panel body w1. As a result, it is possible to prevent formation defects such as welds and voids from occurring in the panel body w1.
- FIG. 8 is a partial perspective view showing a slide frame nesting structure in the resin mold shown in FIG.
- a rectangular insert 56 is inserted into the movable mold 52.
- rectangular rib grooves 56a, 56b, 56c are formed at positions corresponding to the stepped reinforcing rib w2, and the slide piece 53 having a substantially L-shaped cross section in the rib grooves 56a, 56b, 56c. (53a, 53b, 53c) are inserted so as to be movable up and down.
- a convex portion 532 protruding in the horizontal direction is formed at the upper end of the slide piece 53 (53a, 53b, 53c).
- the gaps between the rib grooves 56a, 56b, 56c formed in the insert 56 and the slide pieces 53a, 53b, 53c constitute a cavity w20 (see FIGS. 6 and 7) of the stepped reinforcing rib w2. Therefore, the thickness of the stepped reinforcing rib w2 can be easily changed by adjusting the gap. In particular, it becomes easy to set the thickness of the base end portion w2a to be thin.
- Cavities 53ag, 53bg, 53cg of the resin supply path are vertically formed at predetermined intervals on the convex portions 532 of the slide pieces 53a, 53b, 53c.
- cavities 53ah, 53bh, and 53ch of gusset ribs are formed in an inclined shape on the convex portions 532 of the slide pieces 53a, 53b, and 53c at predetermined intervals.
- the resin supply passage cavities 53ag, 53bg, 53cg and the gusset rib cavities 53ah, 53bh, 53ch are all narrow grooves, but the slide pieces 53a, 53b, 53c can be taken out of the insert 56 and processed. Improves.
- the cavity of the gusset rib can also be provided in a shoulder portion formed at a position corresponding to the root of the base end portion w2a of the stepped reinforcing rib w2 in the rib grooves 56a, 56b, 56c formed in the insert 56.
- the distal end portion 22 of the stepped reinforcing rib 2 is melted prior to the proximal end portion 21. Since the resin supply port 32 for supplying the resin is formed, the molten resin filled in the cavity of the mold is supplied from the resin supply port 32 in advance to the distal end portion 22 and then delayed to the base end portion 21. Will be supplied. Therefore, the molten resin supplied from the resin supply port 32 to the distal end portion 22 can flow from the distal end portion 22 toward the proximal end portion 21.
- the molten resin at the distal end portion 22 supplied from the resin supply port 32 is first cooled and solidified, and then the molten resin supplied from the distal end portion 22 to the proximal end portion 21 is solidified later than the distal end portion 22. To do.
- the stepped reinforcing rib 2 it is possible to significantly reduce the influence of the tensile force accompanying the resin shrinkage at the tip portion 22 having a large heat capacity on the sink of the panel body 1.
- the resin supply path 3 communicating with the resin supply port 32 is connected to the rib height direction of the stepped reinforcing rib 2 from the inner side surface 11 of the panel body 1 to the lower end 222 of the front end portion 22 (arrow Z).
- the molten resin flowing in the surface direction passes through the resin supply path 3 and the rib height direction of the stepped reinforcing rib 2 (the direction of the arrow Z). And is supplied from the resin supply port 32 to the lower end 222 of the front end portion 22.
- the molten resin supplied to the lower end 222 of the distal end portion 22 quickly moves the distal end portion 22 while moving the thick distal end portion 22 in the rib extending direction (direction of arrow X) of the stepped reinforcing rib 2.
- the whole is filled.
- the molten resin filled in the entire distal end portion 22 extends from the lower end 222 of each distal end portion 22 in the rib extending direction (the direction of the arrow X) of the stepped reinforcing rib 2 to the thin proximal end portion 21. It flows toward the panel body 1 side.
- a molten resin supply circuit to the rib 2 is formed. Accordingly, the molten resin at the distal end portion 22 filled earlier in time starts to solidify ahead of the molten resin at the proximal end portion 21 filled later.
- the tensile force accompanying the thermal contraction of the molten resin at the distal end portion 22 having a large heat capacity is canceled by the molten resin at the base end portion 21 that has not been solidified, and the influence of the tensile force on the panel body 1 is substantially avoided. can do.
- the resin supply path 3 has a rib height direction in which the thickness of the base end portion 21 is partially increased in the rib extending direction (the direction of the arrow X) of the stepped reinforcing rib 2. Therefore, the fluidity of the molten resin in the rib height direction where the resin supply passage 3 is formed at the base end portion 21 is formed by the resin supply passage 3 at the base end portion 21. This improves the fluidity of the molten resin in the rib height direction of the portions that are not formed.
- the resin supply path 3 since the resin supply path 3 was intermittently formed in the rib extending direction (the direction of the arrow X) of the stepped reinforcing rib 2, the resin supply path 3 is formed after the injection molding. At the time of mold release, it can be easily bent in the direction (in the direction of arrow Y) perpendicular to the rib extending direction together with the stepped reinforcing rib 2.
- the lower end 222 of the distal end portion 22 is formed in a tapered shape so that the thickness gradually decreases toward the proximal end portion 21, so that the molten resin supplied to the distal end portion 22 is Further, it can flow quickly and smoothly in the rib extending direction (the direction of the arrow X) along the lower end 222 of the tapered tip portion 22.
- the lower end 222 of the distal end portion 22 serves as a flow path in the rib extending direction (the direction of the arrow X) of the molten resin supplied to the distal end portion 22.
- the molten resin supplied to the distal end portion 22 can flow into the proximal end portion 21 substantially equally at different positions in the rib extending direction (the direction of the arrow X). Therefore, sink marks occurring on the outer surface 12 of the panel body 1 can be reduced substantially evenly at any location in the rib extending direction (the direction of the arrow X) of the stepped reinforcing rib 2.
- the inclination angle i formed in the tapered shape of the lower end 222 of the tip end portion 22 is about 45 degrees, the molten resin extends along the rib extending direction (indicated by the arrow X along the lower end 222 of the tapered tip end portion 22. Direction) can flow more quickly and smoothly.
- the base end portion 21 gradually decreases in thickness from the lower end 222 of the tip end portion 22, and the thickness f on the base side 212 joined to the panel body 1 is minimized (ultra thin). Since it is formed in a tapered shape, the molten resin that has flowed from the distal end portion 22 toward the proximal end portion 21 finally reaches the root side 212 where the thickness is minimum (ultra thin). The molten resin that has reached the base side 212 merges with the molten resin flowing in the surface direction (direction perpendicular to the rib extending direction (the direction of the arrow Y)) through the panel body 1 to start solidification.
- the solidification timing is later than the solidification timing of the molten resin at the tip portion 22.
- the tensile force accompanying the resin shrinkage at the tip portion 22 having a large heat capacity is canceled by the molten resin on the base side 212 that has not yet been solidified, and the influence on the panel body 1 can be further avoided.
- the sink marks generated on the outer surface 12 of the panel body 1 can be further reduced.
- the gusset rib 4 to be joined to the panel body 1 is intermittently formed on the base side 212 of the base end portion 21 in the rib extending direction (direction of arrow X) of the stepped reinforcing rib 2. Therefore, the base side 212 of the base end portion 21 is partially reinforced by the gusset rib 4, and the rigidity of the stepped reinforcement rib 2 is improved. Therefore, even if an external force is applied to the vehicle resin component 10, the outer surface 12 of the panel body 1 is less likely to be distorted or deformed.
- the stepped reinforcing ribs 2 extend substantially parallel to and away from each other. Therefore, the panel body 1 has a small sectional curvature of the curved surface and a relatively low surface rigidity. Can be effectively reinforced while reducing sink marks and the like of the panel body 1. That is, generally, the panel main body 1 in the resin component 10 for a vehicle is provided with a general portion 13 formed between the ridge line portion 15 and the ridge line portion 15 in order to achieve both a design appearance on the design surface and panel rigidity. It is formed by a combination.
- the cross-sectional curvature in the vicinity of the ridge line portion 15 is larger than the cross-sectional curvature of the general portion 13 formed between the ridge line portions, the vicinity of the ridge line portion 15 is a region having high surface rigidity, and the thin wall in the vicinity of the ridge line portion 15 is thin. The conversion is easy.
- the general part 13 formed between the ridge line part 15 and the ridge line part 15 has a relatively small cross-sectional curvature and a low surface rigidity, it is necessary to increase the surface rigidity by the reinforcing rib. .
- the stepped reinforcement rib 2 is extended in the region of the general portion 13 having relatively low surface rigidity compared to the vicinity of the ridge line portion 15 so as to be spaced apart from each other substantially in parallel. Both the thinning and high rigidity of the panel main body 1 and the stepped reinforcing rib 2 can be realized while reducing the sink marks and the like of the panel main body 1 due to the resin shrinkage.
- the molten resin is supplied to the distal end portion 22 of the stepped reinforcing rib 2 ahead of the proximal end portion 21.
- the molten resin filled in the cavity of the mold is supplied to the proximal end portion 21 after being supplied to the distal end portion 22 in advance. Therefore, the molten resin supplied to the distal end portion 22 can flow from the distal end portion 22 toward the proximal end portion 21. Accordingly, the molten resin at the tip portion 22 supplied in advance is first cooled and solidified, and thereafter, the molten resin supplied from the tip portion 22 to the base end portion 21 is solidified later than the tip portion 22.
- the injection mold 5 of the vehicle resin component 10 is molded with the negative corner portion w2c having an undercut shape with respect to the mold opening direction of the stepped reinforcing rib w2.
- a slide piece 53 is provided, and the slide piece 53 is movable in the direction close to the panel body w1 in accordance with the resin shrinkage in the rib height direction of the stepped reinforcing rib w2, so that the melt filled in the cavity of the mold is provided.
- the tip w2b of the stepped reinforcing rib w2 comes into contact with the convex portion 532 of the slide piece 53 that forms the negative angle portion w2c of the stepped reinforcing rib w2, and the slide piece 53 can be moved in the direction approaching the panel body w1.
- the tensile force accompanying the resin contraction in the rib height direction of the stepped reinforcing rib does not act on the outer surface of the panel main body w1, and the sink marks generated on the outer surface of the panel main body w1 are greatly reduced.
- the tensile force does not act on the base end portion w2a of the stepped reinforcing rib w2
- the possibility of breakage is greatly reduced even if the thickness of the base end portion w2a of the stepped reinforcing rib w2 is reduced.
- the slide piece 53 is connected to the lifting plate 551 that moves up and down in the mold opening direction of the lifter device 55 provided in the injection mold 5.
- the slide piece 53 is also raised at the same time, and the injection molded product w can be easily released if the stepped reinforcing rib w2 escapes from the cavity of the mold.
- the slide piece 53 since the slide piece 53 is connected to the lifting plate 551 of the lifter device 55 via the elastic body 554, the slide piece 53 can move following the contraction operation of the stepped reinforcing rib w2 in the rib height direction.
- the elastic body 554 may be a spring member or a gas member.
- the elastic body 554 urges the slide piece 53 in the direction close to the lifting plate 551, when the molten resin is injected into the cavity of the panel body w1, the slide piece 53 is attached to the panel body w1. It does not protrude into the cavity. Therefore, the slide piece 53 does not hinder the flow of the molten resin in the cavity of the panel main body w1, so that molding defects such as weld lines and voids are not generated in the panel main body w1.
- the resin supply port 32 is formed at the lower end 222 of the tip end portion 22, and the resin supply path 3 communicating with the resin supply port 32 is connected from the inner surface 11 of the panel body 1 to the lower end 222 of the tip end portion 22.
- the resin supply path 3 communicating with the resin supply port 32 is connected from the inner surface 11 of the panel body 1 to the lower end 222 of the tip end portion 22.
- a side gate 3a that forms a resin supply port at the distal end portion 22 at the side end portion 23 of the rib extending direction of the stepped reinforcing rib 2 (direction of arrow X). It is.
- the runner 31a and the sprue 32a constituting the resin supply path are deleted after molding.
- a submarine gate 3b that forms a resin supply port on the side surface of the tip 22 of the stepped reinforcing rib 2.
- the connecting portion 31b of the submarine gate 3b is separated from the distal end portion 22 when the panel receiving member 54 of the lifter device rises in the direction of the arrow u.
- the side end 23 of the end of the stepped reinforcing rib 2 (in the direction of the arrow X) of the terminal is formed so as to intersect the inner side surface 11 of the panel body 1 substantially perpendicularly.
- an inclined slow side portion 231 can be added. Since the slow side portion 231 can avoid a sudden change in the heat capacity at the side end portion 23, the formation of sink marks occurring on the outer side surface 12 of the panel body 1 can be reduced.
- the present invention can be used for a resin component for a vehicle in which a reinforcing rib is erected on the inner side surface of a panel body having a design surface and a manufacturing method thereof.
- the present invention can be used for a resin component for a vehicle formed thinner than a wall thickness and a manufacturing method thereof.
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- Architecture (AREA)
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- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
まず、本発明に係る実施形態である車両用樹脂部品の構造について、図1~図3を用いて説明する。図1に、本発明に係る実施形態である車両用樹脂部品の部分斜視図を示す。図2に、図1に示す車両用樹脂部品のA部詳細斜視図を示す。図3に、図2に示す段付き補強リブ及び樹脂供給路の側面図を示す。
次に、段付き補強リブ2と樹脂供給路3の樹脂流れ動作について、図4を用いて説明する。図4に、図2に示す段付き補強リブ及び樹脂供給路に供給される溶融樹脂の流れを模式的に表示した斜視図を示す。
次に、本実施形態に係る車両用樹脂部品を射出成形する樹脂成形型の構造及びスライド駒の動作方法について、図5~図8を用いて説明する。図5に、図1に示す車両用樹脂部品を成形する樹脂成形型の部分断面図を示す。図6に、図5に示す樹脂成形型のスライド駒に関する模式的断面図を示す。図7に、図6に示すスライド駒の動作説明図を示す。図8に、図5に示す樹脂成形型の入子構造を表す部分斜視図を示す。
次に、射出成形型におけるスライド駒の入子構造について、図8を用いて説明する。図8に、図5に示す樹脂成形型におけるスライド駒の入子構造を表す部分斜視図を示す。
以上、詳細に説明したように、本発明の1態様の実施形態に係る車両用樹脂部品10によれば、段付き補強リブ2の先端部22には、その基端部21より先行して溶融樹脂が供給される樹脂供給口32を形成したので、金型のキャビティ内に充填された溶融樹脂が、樹脂供給口32から先端部22に先行して供給された後に、基端部21へ遅れて供給されることになる。そのため、樹脂供給口32から先端部22に供給された溶融樹脂は、先端部22から基端部21に向かって流れ込むことができる。したがって、樹脂供給口32から供給された先端部22の溶融樹脂が先に冷却されて凝固し、その後、先端部22から基端部21に供給された溶融樹脂が、先端部22より遅れて凝固する。その結果、段付き補強リブ2において、熱容量の大きい先端部22における樹脂収縮に伴う引張力が、パネル本体1のヒケに与える影響を、大幅に低減することができる。
2 段付き補強リブ
3 樹脂供給路
4 ガゼットリブ
5 樹脂成形型
10 車両用樹脂部品
11 内側面
12 外側面
13 一般部
14 湾曲部
15 稜線部(キャラクターライン)
16 稜線部(見切りライン)
21 基端部
22 先端部
23 側端部
32 樹脂供給口
51 固定型
52 可動型
53 スライド駒
55 リフター装置
212 根元側
w 射出成形品
w1 パネル本体
w2 段付き補強リブ
w2a 基端部
w2b 先端部
w2c 負角部
Claims (13)
- 意匠面を有するパネル本体と、当該パネル本体の内側面に立設し、基端部の肉厚が先端部の肉厚より薄く形成されるとともに、リブ延在方向端末の側端部が開放された段付き補強リブとを備えた車両用樹脂部品であって、前記先端部には、前記基端部より先行して溶融樹脂が供給される樹脂供給口を形成したことを特徴とする車両用樹脂部品。
- 請求項1に記載された車両用樹脂部品において、前記樹脂供給口に連通する樹脂供給路を、前記パネル本体の内側面から前記先端部の下端まで前記段付き補強リブのリブ高さ方向に沿って形成したことを特徴とする車両用樹脂部品。
- 請求項2に記載された車両用樹脂部品において、前記樹脂供給路は、前記基端部の肉厚を前記段付き補強リブのリブ延在方向で部分的に厚くしてリブ高さ方向へ延設して形成されたことを特徴とする車両用樹脂部品。
- 請求項2又は請求項3に記載された車両用樹脂部品において、前記樹脂供給路の前後幅及び左右幅は、それぞれ前記基端部の根元側の肉厚の1.5~2.5倍程度であることを特徴とする車両用樹脂部品。
- 請求項2乃至請求項4のいずれか1項に記載された車両用樹脂部品において、前記樹脂供給路は、前記段付き補強リブのリブ延在方向で間欠的に形成されたことを特徴とする車両用樹脂部品。
- 請求項1乃至請求項5のいずれか1項に記載された車両用樹脂部品において、前記先端部の下端は、前記基端部に向かって徐々に肉厚が薄くなるようテーパ状に形成されたことを特徴とする車両用樹脂部品。
- 請求項1乃至請求項6のいずれか1項に記載された車両用樹脂部品において、前記基端部は、前記先端部の下端から徐々に肉厚が薄くなって前記パネル本体と接合する根元側の肉厚が最小となるようテーパ状に形成されたことを特徴とする車両用樹脂部品。
- 請求項1乃至請求項7のいずれか1項に記載された車両用樹脂部品において、前記基端部の根元側には、前記パネル本体と接合するガゼットリブを前記段付き補強リブのリブ延在方向で間欠的に形成したことを特徴とする車両用樹脂部品。
- 請求項1乃至請求項8のいずれか1項に記載された車両用樹脂部品において、前記段付き補強リブは、互いに略平行に離間して延設されたことを特徴とする車両用樹脂部品。
- 請求項1乃至請求項9のいずれか1項に記載された車両用樹脂部品の製造方法であって、前記先端部には、前記基端部より先行して溶融樹脂を供給することを特徴とする車両用樹脂部品の製造方法。
- 請求項10に記載された車両用樹脂部品の製造方法であって、前記車両用樹脂部品の射出成形型には、前記段付き補強リブの型開き方向に対してアンダーカット形状となる負角部を成形するスライド駒を備え、前記スライド駒は、前記段付き補強リブのリブ高さ方向への樹脂収縮に従って前記パネル本体に近接する方向へ移動可能とすることを特徴とする車両用樹脂部品の製造方法。
- 請求項11に記載された車両用樹脂部品の製造方法において、前記スライド駒は、前記射出成形型に設けられたリフター装置の型開き方向へ昇降する昇降板に弾性体を介して連結されていることを特徴とする車両用樹脂部品の製造方法。
- 請求項12に記載された車両用樹脂部品の製造方法において、前記弾性体は、前記スライド駒を前記昇降板に近接する方向に付勢していることを特徴とする車両用樹脂部品の製造方法。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US14/412,382 US9359013B2 (en) | 2013-04-22 | 2014-03-10 | Resin vehicle part and method for manufacturing same |
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JP2013-089302 | 2013-04-22 | ||
JP2013089302A JP6011434B2 (ja) | 2013-04-22 | 2013-04-22 | 車両用樹脂部品及びその製造方法 |
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WO2014174921A1 true WO2014174921A1 (ja) | 2014-10-30 |
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PCT/JP2014/056105 WO2014174921A1 (ja) | 2013-04-22 | 2014-03-10 | 車両用樹脂部品及びその製造方法 |
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US (1) | US9359013B2 (ja) |
JP (1) | JP6011434B2 (ja) |
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WO2017169190A1 (ja) * | 2016-03-29 | 2017-10-05 | トヨタ車体株式会社 | 樹脂部品、及びその樹脂部品の製造方法 |
US11554526B2 (en) | 2016-03-29 | 2023-01-17 | Toyota Shatai Kabushiki Kaisha | Resin parts and manufacturing method of resin parts |
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JP6653013B2 (ja) * | 2016-03-31 | 2020-02-26 | 本田技研工業株式会社 | 射出成形金型、射出成形方法、および、成形品 |
JP7057111B2 (ja) * | 2017-12-01 | 2022-04-19 | キヤノン株式会社 | シール機構の製造方法 |
DE102018203042A1 (de) * | 2018-03-01 | 2019-09-05 | BSH Hausgeräte GmbH | Verfahren zum Herstellen spritzgegossenen Haushaltsgerätebauteils auf mehreren Fließwegen |
JP6973648B2 (ja) * | 2018-06-29 | 2021-12-01 | 昭和電工マテリアルズ株式会社 | 樹脂成形品及び樹脂成形品の製造方法 |
CN109630507A (zh) * | 2018-12-18 | 2019-04-16 | 长亨汽配工业(昆山)有限公司 | 一种克服注塑凹陷的内边连接结构 |
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Also Published As
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US9359013B2 (en) | 2016-06-07 |
JP2014210418A (ja) | 2014-11-13 |
JP6011434B2 (ja) | 2016-10-19 |
US20160031491A1 (en) | 2016-02-04 |
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