WO2019150760A1 - 樹脂成形品及び樹脂成形品の成形方法 - Google Patents

樹脂成形品及び樹脂成形品の成形方法 Download PDF

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Publication number
WO2019150760A1
WO2019150760A1 PCT/JP2018/044748 JP2018044748W WO2019150760A1 WO 2019150760 A1 WO2019150760 A1 WO 2019150760A1 JP 2018044748 W JP2018044748 W JP 2018044748W WO 2019150760 A1 WO2019150760 A1 WO 2019150760A1
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WO
WIPO (PCT)
Prior art keywords
rib
wall
molded product
resin
resin molded
Prior art date
Application number
PCT/JP2018/044748
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English (en)
French (fr)
Japanese (ja)
Inventor
秀夫 小木
公彦 肥塚
Original Assignee
本田技研工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 本田技研工業株式会社 filed Critical 本田技研工業株式会社
Priority to CN201880087843.6A priority Critical patent/CN111655443B/zh
Priority to DE112018006986.9T priority patent/DE112018006986T5/de
Priority to JP2019568902A priority patent/JP6895547B2/ja
Publication of WO2019150760A1 publication Critical patent/WO2019150760A1/ja
Priority to PH12020551221A priority patent/PH12020551221A1/en

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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
    • 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
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/174—Applying a pressurised fluid to the outer surface of the injected material inside the mould cavity, e.g. for preventing shrinkage marks

Definitions

  • the wall portion (52x) is integrally provided with reinforcing ribs (52m, 52q, 52r, 56a) having a larger protruding amount from the surface of the wall portion (52x) than the elongated rib-like protrusion (52d).
  • a gradually changing thickness portion in which the wall portion (52x) gradually changes in thickness between the elongated rib-like projection (52d) and the reinforcing rib (52m, 52q, 52r, 56a) (56d) may be provided.
  • the wall portion is integrally provided with a reinforcing rib having a larger protruding amount from the surface of the wall portion than the elongated rib-shaped projection portion, and the wall thickness is between the elongated rib-shaped projection portion and the reinforcing rib. Since the gradual change thickness part which changes gradually is provided, in the wall part, the part which requires rigidity and the part which does not need rigidity so much can be arrange
  • the resin can be obtained without impairing the appearance of the resin molded product.
  • the wall can be thinned to the vicinity of the opening of the molded product.
  • the present invention forms elongated rib-shaped projections surrounding a predetermined range of the surface of a wall of a resin molded product, and the elongated rib-shaped projections are elongated by directional solidification in which the resin solidifies faster than other parts. Since the surrounding portion surrounded by the rib-like protrusion is sealed so as to hold the pressurized gas, the thickness of the resin molded product can be reduced, and the resin molded product can be reduced in weight. Moreover, since the rigidity of the resin molded product can be enhanced by the elongated rib-shaped protrusions, the impact resistance of the resin molded product can be improved. In addition, by sealing the pressurized gas so that it does not leak to the outside with the elongated rib-like projections, the above-described thin-walled resin molded product can be manufactured without restricting the parting line of the resin molding die. .
  • the fixed mold 25 includes a passage 25a through which the molten resin 38 passes.
  • the passage 25 a has one end connected to the nozzle 23 a of the injection molding machine 21 and the other end connected to the cavity 28.
  • the movable mold 26 includes a recess 31 that forms a cavity 28 and a gas channel 32 that communicates with the recess 31.
  • the recessed part 31 is provided with the recessed groove 31a formed in the endless shape following the peripheral part.
  • the concave groove 31a forms a gas seal rib 10a as an elongated rib-shaped protrusion
  • the concave portion 31 forms a plate-like wall portion 10b including the gas seal rib 10a.
  • the gas channel 32 includes a main passage 34 connected to an external gas supply source and a plurality of sub passages 35 formed in the main passage 34, and the tip of the sub passage 35 communicates with the recess 31.
  • the molten resin 38 in the cylinder 23 is injected into the resin molding die 22 from the nozzle 23a.
  • the molten resin 38 flows into the cavity 28 through the passage 25a.
  • the molten resin 38 in the groove 31 a solidifies faster than the molten resin 38 in other portions due to directional solidification.
  • nitrogen gas is compressed from the gas channel 32 between the bottom surface 31 b of the recess 31 in the cavity 28 and the molten resin 38 and compressed to a predetermined pressure. Inject under pressure.
  • the motorcycle 40 includes a front wheel 41 and a vehicle body front part 44 provided with a steering wheel 42 for steering the front wheel 41, and a vehicle body rear part 48 provided with a rear wheel 45 serving as a driving wheel and a seat 46 positioned above the rear wheel 45. And a step floor 49 connecting the vehicle body front portion 44 and the vehicle body rear portion 48.
  • the vehicle body front portion 44 and the vehicle body rear portion 48 are covered with a vehicle body cover 51.
  • the vehicle body cover 51 includes a front cover 52, a pair of left and right leg shields 53, and a handle cover 54 at the vehicle body front portion 44.
  • the front cover 52 is in a state removed from the vehicle body.
  • the front cover 52 is rotated by the handle 42 and covers a front fork (not shown) that supports the front wheel 41 (see FIG. 3) from the front.
  • the left and right leg shields 53 extend diagonally rearward from the left and right edges of the front cover 52 and cover the legs of the driver seated on the seat 46 (see FIG. 3) from the front.
  • the handle cover 54 covers the central portion of the handle 42.
  • the seal rib 52d and a protruding portion assembly 52e including a plurality of protruding portions are integrally provided. That is, in the front cover 52, the reinforcing rib assembly 52b, the gas seal rib 52d, and the protruding portion assembly 52e protrude from the back surface 52a of the wall 52x.
  • the protrusion assembly 52e includes a pair of left and right clip nut mounting seats 52f, a pair of left and right undercut rib portions 52g, a plurality of clip fastening portions 52h, a plurality of seated fastening boss portions 52j, and a ribbed fastening boss portion 52k. .
  • a reinforcing plate (not shown) of the front cover 52 is fastened with screws with these seated fastening boss portions 52j and ribbed fastening boss portions 52k.
  • a plurality of inclined cores 61 to 67 for performing die cutting from a plurality of undercuts (including a pair of left and right undercut rib portions 52g) provided on the back surface 52a of the front cover 52 are provided. It arrange
  • the height of the gas seal rib 52d is H1 and the width of the upper end portion of the gas seal rib 52d is W1, the height H1 is lower than the height He of the edge reinforcing rib 52m (H1). ⁇ He)
  • the width W1 is smaller than the width We of the edge reinforcing rib 52m (W1 ⁇ We).
  • Tg the thickness of the wall 52x between the gas seal rib 52d and the edge reinforcing rib 52m
  • the wall 52x opposite to the edge reinforcing rib 52m of the gas seal rib 52d is Tf (see also FIG. 13)
  • the width W1 is smaller than the wall thickness Tf (W1 ⁇ Tf).
  • the gas seal rib 52d is a long and narrow rib having a smaller cross-sectional area than the edge reinforcing rib 52m, the gas seal rib 52d is more easily solidified than other portions in the state of the molten resin. Therefore, the above-described thickness Tf can be formed thinner than the thickness Tg.
  • the angle ⁇ 1 formed by the intermediate reinforcing rib 52q and the gas seal rib 52d and the angle ⁇ 2 formed by the intermediate reinforcing rib 52r and the gas seal rib 52d are 20 ° or more ( ⁇ 1 ⁇ 20 °, ⁇ 2 ⁇ 20 °), respectively.
  • the insertion gas (recess) is easily formed by applying the pressurized gas to a location where the molten resin is slowly solidified at the intersection.
  • the insertion groove is a part that affects the strength, and it is necessary to prevent the insertion groove from being formed.
  • the volume of the intersecting portion is further reduced, the solidification of the intersecting portion is accelerated, and the formation of the insertion groove can be prevented.
  • the height of the intermediate reinforcing rib 52q from the back surface 52a is H2, and the width of the tip of the intermediate reinforcing rib 52q is W2.
  • the height H2 is higher than the height H1 of the gas seal rib 52d shown in FIGS.
  • the width W2 is larger than the width W1 of the gas seal rib 52d shown in FIGS.
  • FIG. 11 is a perspective view including a cross section taken along line XI-XI in FIG.
  • a honeycomb reinforcing portion 52t in which a plurality of honeycomb reinforcing ribs 52s protruding in a hexagonal shape are assembled is integrally formed.
  • the honeycomb reinforcing portion 52t has an extremely thin wall formed on a wall portion 52x inside a predetermined honeycomb reinforcing rib 52s1 (same shape as the honeycomb reinforcing rib 52s, but the reference numeral is different for identification) by a resin molding die.
  • a portion 52w (see also FIG. 13) is formed.
  • the thickness of the ultrathin portion 52w is assumed to be Te. Further, a resin molding metal is formed on the inner wall 52x of the honeycomb reinforcing ribs 52s2 and 52s3 adjacent to the honeycomb reinforcing rib 52s1 (the same shape as the honeycomb reinforcing rib 52s, but the reference numerals are different for identification). Depending on the mold, it is formed to have the same thickness Te as the ultrathin portion 52w. When the thickness of each of the middle thin portions 52z and 52z is Tf, Te ⁇ Tf.
  • Gas channel slits 70 are formed in the core 78 (see FIG. 12) of the resin molding die 75 (see FIG. 13) that forms the honeycomb reinforcing portion 52t. From this gas channel slit 70, the pressurized gas acts on the molten resin forming the ultrathin wall portion 52w of the wall portion 52x surrounded by the honeycomb reinforcing ribs 52s1, 52s2, 52s3. Therefore, the ultrathin portion 52w is made thinner by this pressurized gas than the thickness setting by the resin molding die.
  • FIG. 12 is a perspective view of the core die 77 of the resin molding die 75 as seen from the back side.
  • the cavity mold 76 is represented by a broken line and the core mold 77 is represented by a solid line.
  • the shape of each part of the core mold 77 corresponds to the shape of each part of the front cover 52 shown in FIG.
  • the core mold 77 is described as being reversed left and right with respect to the front cover 52 shown in FIG.
  • the resin mold 75 includes a cavity mold 76 that is a fixed mold, a core mold 77 that is a movable mold, a core 78 that forms a honeycomb reinforcing portion 52t (see FIG.
  • a front cover as a work is provided with a plurality of gas channel pins 79 and a plurality of gas channel slits 70 to 74 on the core mold 77 of the resin mold 75. It arrange
  • pressurized gas is supplied to the area defined by the plurality of honeycomb reinforcing ribs 52 s formed by the core 78 through the gas channel slits 70 to 74 provided in the core 78.
  • the portions other than the honeycomb reinforcing portion 52t are partitioned by the reinforcing ribs.
  • the discharge port of the gas channel pin 79 see also FIG.
  • an extremely thin wall portion 52w and an edge portion (gas seal rib) of the wall portion 52x are formed at the center portion of the wall portion 52x (including a part of the honeycomb reinforcing portion 52t).
  • the thin portion 52z is formed in the portion between the thick portion 52y and the extremely thin portion 52w and the edge portion of the wall portion 52x (including a part of the honeycomb reinforcing portion 52t). Yes.
  • the thicknesses of the extremely thin portion 52w, the middle thin portion 52z, and the thick portion 52y are Te, Tf, and Tg
  • the relationship between the thicknesses is Te ⁇ Tf ⁇ Tg.
  • the wall 52x is referred to as an ultrathin zone E having an ultrathin portion 52w, a middle thin zone F having a middle thin portion 52z, and a thick zone G having a thick portion 52y.
  • the wall thickness is set in a three-stage zone. Note that the molding dies for forming the wall thicknesses Te and Tf are set to be slightly thicker than the wall thicknesses Te and Tf in anticipation of the molding by the pressurized gas, and the molten resin is injected, and the injection time is correspondingly increased. Shortened. As described above, the surrounding portion 56x inside the gas seal rib 52d in the wall portion 52x is formed thinner than the outside of the gas seal rib 52d in the wall portion 52x.
  • FIG. 14 is a perspective view showing a portion C of FIG. 15 is a perspective view including a cross section taken along line XV-XV in FIG.
  • the wall 52x is integrally formed with a gas seal rib 52d and a reinforcing rib 56a disposed along the gas seal rib 52d and spaced apart from the gas seal rib 52d.
  • the wall portion 52x surrounded by the gas seal rib 52d is formed with a thin wall portion 56b, and the wall portion 52x further away from the gas seal rib 52d than the reinforcing rib 56a has a wall thickness Tf of the thin wall portion 56b.
  • a thick portion 56c having a thicker thickness Tg is formed. As shown in FIG.
  • the thickness of the thin portion 56y is the same as that of the thin portion 56b or thicker than that of the thin portion 56b, and the gradually changing thickness portion 56d is a reinforcing rib from the thin portion 56y side in the range from the edge of the thin portion 56y to the reinforcing rib 56a. As it goes to the 56a side, the wall thickness increases in a tapered shape.
  • the gradually changing thickness portion 56d is formed from a position separated by a predetermined distance L from the gas seal rib 52d toward the reinforcing rib 56a to the reinforcing rib 56a. Since the wall thickness is thick in the gradually changing thickness portion 56d, particularly in the vicinity of the reinforcing rib 56a, in the molding process of the front cover 52, solidification is slower than in the vicinity of the gas seal rib 52d due to the directional solidification of the molten resin. Become. Therefore, when the vicinity of the reinforcing rib 56a of the gradually changing thickness portion 56d is pressed with a pressurized gas at the time of melting, the molten resin digs into the soft portion inside, and an insertion groove is formed on the surface of the molten resin. Therefore, the pressure of the pressurized gas is prevented from acting on the vicinity of the reinforcing rib 56a of the gradually changing thickness portion 56d by the gas seal rib 52d.
  • FIG. 16 is a perspective view showing a portion D in FIG. 6, and FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG.
  • one end of two reinforcing ribs 56e and 56f is connected to the edge reinforcing rib 52m of the front cover 52.
  • the reinforcing rib 56g extends along the edge reinforcing rib 52m so that one end thereof is connected to one reinforcing rib 56e and intersects the reinforcing rib 56f.
  • the gas seal rib 52d is bent along the edge reinforcing rib 52m and bent along the reinforcing rib 56e, and intersects the reinforcing rib 56g.
  • a gas seal rib 52d is integrally formed on the wall portion 56h.
  • the gas seal rib 52d is provided not only along the outer edge in the vicinity of the outer edge of the wall portion 52x of the front cover 52 but also at the edge reinforcing rib provided at the outer edge of the wall portion 52x. Since it can be provided on 52 m, a nitrogen gas seal portion can be arranged so as not to leak out of the resin molding die 75 from the gap of the parting line 81 (see FIG. 13). As a result, not only a seal member dedicated to the resin molding die 75 can be omitted, but also the thickness of the front cover 52 can be reduced to a wide range up to the vicinity of the outer peripheral edge. Can be achieved.
  • the reinforcing ribs 56a having a larger protruding amount from the surface of the wall portion 52x than the gas seal rib 52d are formed on the wall portions 52x located at both end portions of the front cover 52, and By providing the gradually changing thickness portion 56d in which the thickness of the wall portion 56z gradually changes between each of the gas seal rib 52d and the reinforcing rib 56a, the portion that requires rigidity is thinned by the gas seal rib 52d. Can be appropriately arranged.
  • gas seal ribs 52 d are continuously provided on the edge of the wall 52 x, and the front cover 52 is not impaired without deteriorating the appearance of the front cover 52.
  • the wall 52x can be thinned to the vicinity of the edge.
  • FIG. 18 is a perspective view showing the lower part of the front cover 52.
  • the front cover 52 includes a rear bent wall portion 56h that is bent rearward of the vehicle at a lower portion of the wall portion 52x.
  • An opening 56j is opened at the center in the vehicle width direction of the rear bent wall 56h.
  • a horn (not shown) is disposed inside the front cover 52, and the sound of the horn is released to the outside of the vehicle body through the opening 56j. By providing the opening 56j, the horn volume outside the vehicle body can be secured.
  • the opening 56j is formed by an inclined core 85 (see FIG. 19) provided in the resin molding die 75 (see FIG. 13).
  • FIG. 19 is a perspective view showing the lower portion of the front cover 52 from the back surface 52a side.
  • the inclined core 85 is disposed in a portion that becomes the back surface 52a of the rear bent wall portion 56h of the front cover 52.
  • the inclined core 85 is for processing an opening 56j (see FIG. 18) and an undercut around the opening 56j.
  • a solid line indicates a state in which the inclined core 85 is disposed on a portion that becomes the back surface 52a of the rear bent wall portion 56h, and a two-dot chain line indicates that the molten core is separated from the rear bent wall portion 56h after the molten resin is solidified. Shows the state of sliding.
  • FIG. 20 is a front view showing a part of the front surface 85a of the inclined core 85
  • FIG. 21 is a cross-sectional view taken along the line XXI-XXI in FIG.
  • the inclined core 85 surrounds the convex portion 85b at a predetermined distance from the convex portion 85b that forms the opening 56j (see FIG. 18) of the front cover 52 (see FIG. 18).
  • An annular groove 85c formed as described above is provided on the front surface 85a.
  • the convex part 85b of the inclined core 85 is a part which forms the opening part 56j of the back bending wall part 56h.
  • the annular groove 85c of the inclined core 85 is a portion that forms an annular gas seal rib 56k that protrudes from the back surface 52a of the rear bent wall 56h around the opening 56j.
  • FIG. 22 is a perspective view showing the opening 56j of the rear bent wall portion 56h in the front cover 52 and the periphery thereof.
  • a continuous annular gas seal rib 56k is formed around the opening 56j.
  • the gas seal rib 56k is formed inside the gas seal rib 52d.
  • FIGS. 21 and 22 when the front cover 52 is injection-molded, the molten resin in the annular groove 85c in the inclined core 85 in the resin molding die 75 (see FIG. 12) is caused by directional solidification. It solidifies faster than the molten resin around the annular groove 85c. As a result, the gas seal rib 56k is formed.
  • a gas seal rib 52d is also formed continuously from the rear surface 52a of the front cover 52 on the edge reinforcing rib 52m of the rear bent wall portion 56h of the front cover 52.
  • the space between the gas seal rib 52d and the gas seal rib 56k in the resin molding die 75 is a sealed space. Therefore, when pressurized gas is applied to the molten resin surrounded by the gas seal rib 52d and the gas seal rib 56k, the gas seal rib 56k prevents the pressurized gas from leaking to the opening 56j side.
  • the wall portion 52x around the gas seal rib 56k can be made thin. In this manner, the wall thickness of the lower wall portion 52x of the front cover 52 can be reduced to the vicinity of the opening 56j.
  • the front cover 52 as a resin molded product is molded by adding a pressurized gas to the molten resin in the resin molding die 75.
  • the front cover 52 is integrally formed with a gas seal rib 52d as an elongated rib-like protrusion on the wall 52x, and the gas seal rib 52d is disposed so as to surround a predetermined range of the wall 52x.
  • the wall portion 52x of the portion surrounded by the gas seal rib 52d is formed thinner than the thickness of other portions of the wall portion 52x.
  • a gas seal rib 52d surrounding a predetermined range of the surface is provided on the wall portion 52x of the front cover 52.
  • the thickness of the front cover 52 can be reduced, and the front cover 52 can be reduced in weight. Further, since the rigidity of the front cover 52 can be enhanced by the gas seal rib 52d, the impact resistance of the front cover 52 can be improved. Further, since it is possible to seal the pressurized gas so that it does not leak to the outside with the gas seal rib 52d, a dedicated sealing means is not required for the resin molding die 75, and the parting line 81 is not restricted.
  • the thin cover reinforced front cover 52 can be manufactured.
  • an opening 56j is provided in the wall 52x, and the contour (edge) of the opening 56j extends along the outer edge of the inner surface of the front cover 52 on the back surface 52a of the wall 52x.
  • Gas seal rib 52d is continuously provided along the portion. According to this configuration, the wall 52x can be thinned to the vicinity of the opening 56j of the front cover 52 without deteriorating the appearance of the front cover 52.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
PCT/JP2018/044748 2018-01-31 2018-12-05 樹脂成形品及び樹脂成形品の成形方法 WO2019150760A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201880087843.6A CN111655443B (zh) 2018-01-31 2018-12-05 树脂成型品及树脂成型品的成型方法
DE112018006986.9T DE112018006986T5 (de) 2018-01-31 2018-12-05 Harz-form und formung-verfahren für eine harz-form
JP2019568902A JP6895547B2 (ja) 2018-01-31 2018-12-05 樹脂成形品及び樹脂成形品の成形方法
PH12020551221A PH12020551221A1 (en) 2018-01-31 2020-07-30 Resin molding and molding method for resin molding

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-015910 2018-01-31
JP2018015910 2018-01-31

Publications (1)

Publication Number Publication Date
WO2019150760A1 true WO2019150760A1 (ja) 2019-08-08

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PCT/JP2018/044748 WO2019150760A1 (ja) 2018-01-31 2018-12-05 樹脂成形品及び樹脂成形品の成形方法

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JP (1) JP6895547B2 (zh)
CN (1) CN111655443B (zh)
DE (1) DE112018006986T5 (zh)
PH (1) PH12020551221A1 (zh)
WO (1) WO2019150760A1 (zh)

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Publication number Priority date Publication date Assignee Title
DE102022213000A1 (de) * 2022-12-02 2024-06-13 Volkswagen Aktiengesellschaft Verfahren zur Herstellung einer Instrumententafel für ein Fahrzeug

Citations (4)

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Publication number Priority date Publication date Assignee Title
JPH0866933A (ja) * 1994-08-30 1996-03-12 Idemitsu Petrochem Co Ltd 格子状リブ付き平板の射出成形方法
JP2006069353A (ja) * 2004-09-01 2006-03-16 Toyoda Gosei Co Ltd ホイールキャップ及びその製造方法
JP2006347002A (ja) * 2005-06-16 2006-12-28 Daikyoo Nishikawa Kk 樹脂成形体
JP2008018588A (ja) * 2006-07-12 2008-01-31 Nagoya Seimitsu Kanagata:Kk ヒケ防止成形金型装置

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Publication number Priority date Publication date Assignee Title
GB790639A (en) * 1955-02-01 1958-02-12 Bristol Aircraft Ltd Improvements in or relating to processes for making articles from bonded fibrous material
CN1056574C (zh) * 1995-10-26 2000-09-20 丰田合成株式会社 方向盘底座
JP5410873B2 (ja) * 2009-07-28 2014-02-05 株式会社小糸製作所 車両用灯具
KR101315741B1 (ko) * 2012-03-23 2013-10-10 현대자동차주식회사 치수안정성이 우수한 전기자동차용 배터리 팩 케이스 어셈블리와 그 제조 방법

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0866933A (ja) * 1994-08-30 1996-03-12 Idemitsu Petrochem Co Ltd 格子状リブ付き平板の射出成形方法
JP2006069353A (ja) * 2004-09-01 2006-03-16 Toyoda Gosei Co Ltd ホイールキャップ及びその製造方法
JP2006347002A (ja) * 2005-06-16 2006-12-28 Daikyoo Nishikawa Kk 樹脂成形体
JP2008018588A (ja) * 2006-07-12 2008-01-31 Nagoya Seimitsu Kanagata:Kk ヒケ防止成形金型装置

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JPWO2019150760A1 (ja) 2020-12-10
CN111655443B (zh) 2022-06-21
PH12020551221A1 (en) 2021-04-19
CN111655443A (zh) 2020-09-11
JP6895547B2 (ja) 2021-06-30
DE112018006986T5 (de) 2020-10-08

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