JP2788669B2 - Manufacturing method of hollow resin products - Google Patents

Manufacturing method of hollow resin products

Info

Publication number
JP2788669B2
JP2788669B2 JP19194090A JP19194090A JP2788669B2 JP 2788669 B2 JP2788669 B2 JP 2788669B2 JP 19194090 A JP19194090 A JP 19194090A JP 19194090 A JP19194090 A JP 19194090A JP 2788669 B2 JP2788669 B2 JP 2788669B2
Authority
JP
Japan
Prior art keywords
gas
product
pressure
mold
resin
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
JP19194090A
Other languages
Japanese (ja)
Other versions
JPH0478510A (en
Inventor
恒夫 栗原
常治 長谷川
勝茂 日下
輝男 市川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
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 Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP19194090A priority Critical patent/JP2788669B2/en
Publication of JPH0478510A publication Critical patent/JPH0478510A/en
Application granted granted Critical
Publication of JP2788669B2 publication Critical patent/JP2788669B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/1703Introducing an auxiliary fluid into the mould
    • B29C45/1704Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/1703Introducing an auxiliary fluid into the mould
    • B29C45/1704Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C2045/1718Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles sealing or closing the fluid injection opening

Landscapes

  • 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)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は射出成形金型で中空樹脂製品を成形する際、
溶融樹脂の射出から型開き取り出しまでの時間を短縮
し、生産性の向上を図った製造方法に関する。
DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to molding of a hollow resin product in an injection mold.
The present invention relates to a manufacturing method that shortens the time from injection of a molten resin to removal of a mold from the mold to improve productivity.

(従来の技術) 従来、例えばプラスチック等の溶融樹脂を射出成形金
型のキャビティ中に射出し、樹脂が完全に冷却固化する
前に樹脂内に高圧ガスを注入して製品の一部に中空を形
成するような成形方法が知られている。この方法は、キ
ャビティ内の金型に接触する樹脂の表層が半凝固となっ
た段階で、しかも内部の樹脂が未だ未凝固のうちに表層
の一部に孔をあけ、この孔から内部の未凝固部分に向け
て高圧ガスを注入して、ガス充填部を中空部として形成
するものである。そして例えば製品のうち、周端部の厚
肉フランジ部等を中空とすることにより、成形収縮によ
るひけの防止、残留応力による変形防止、必要な強度の
確保等を図っている。
(Prior art) Conventionally, for example, a molten resin such as plastic is injected into a cavity of an injection mold, and a high-pressure gas is injected into the resin before the resin is completely cooled and solidified to form a hollow in a part of the product. Forming methods for forming are known. According to this method, a hole is formed in a part of the surface layer when the surface layer of the resin in contact with the mold in the cavity is semi-solidified, and while the resin inside is still unsolidified, the hole in the inner layer is formed from the hole. A high-pressure gas is injected toward the solidified portion to form a gas filling portion as a hollow portion. For example, among the products, a thick flange portion or the like at the peripheral end portion is made hollow, thereby preventing sinking due to molding shrinkage, preventing deformation due to residual stress, securing necessary strength, and the like.

(発明が解決しようとする課題) しかし従来は、ガスを注入して中空部を形成した後、
成形品が完全凝固するまで離型することが出来なかっ
た。すなわち中空部に充填されているガス圧を製品が凝
固する前に抜くと、成形収縮を引き起して外観上の見栄
えが悪くなり、一方ガス圧を保持したまま早期に型開き
するとガス圧の影響によって変形する等の不具合が生ず
ることとなるため、型を閉じ、ガス圧を保持したまま製
品を固化させる必要があった。このため成形の1サイク
ルにおける金型の占有時間が長くなり、生産効率上改善
することが望ましかった。
(Problems to be solved by the invention) However, conventionally, after forming a hollow portion by injecting a gas,
The mold could not be released until the molded product was completely solidified. That is, if the gas pressure filled in the hollow part is released before the product solidifies, the molding shrinkage is caused and the appearance is deteriorated.On the other hand, when the mold is opened early while maintaining the gas pressure, the gas pressure is reduced. Since a defect such as deformation occurs due to the influence, it is necessary to close the mold and solidify the product while maintaining the gas pressure. For this reason, the occupation time of the mold in one cycle of molding is prolonged, and it is desired to improve the production efficiency.

(課題を解決するための手段) かかる課題を解決するため本発明は、金型キャビティ
に、製品形状部と製品形状部に連なる非製品形状部を設
け、製品形状部に溶融樹脂を射出して非製品形状部から
ガスを注入する第1工程と、注入したガスの一部を排出
して所定圧まで減圧しその後非製品形状部のガス通路を
封鎖する第2工程と、その製品を金型から取り出しその
後非製品形状部を切除して中空部の残留ガスを排出する
第3工程により製造することとした。
(Means for Solving the Problems) In order to solve such problems, the present invention provides a product cavity and a non-product cavity connected to the product cavity, and injects a molten resin into the product cavity. A first step of injecting a gas from the non-product shape part, a second step of discharging a part of the injected gas and reducing the pressure to a predetermined pressure, and then closing a gas passage of the non-product shape part; Then, the non-product-shaped portion is cut off, and the residual gas in the hollow portion is discharged, thereby producing the third product.

(作用) 樹脂内に注入した高圧ガスの一部を途中で排出し、製
品のひけ防止に必要な程度の所定圧まで減圧保持するこ
とによって、製品の早期取り出しが可能となる。
(Effect) A part of the high-pressure gas injected into the resin is exhausted on the way, and the reduced pressure is maintained to a predetermined pressure necessary for preventing sinking of the product, thereby enabling early removal of the product.

このため金型使用のサイクルの短縮化が図られ、生産
性が高まる。
For this reason, the cycle of using the mold is shortened, and the productivity is increased.

一方、金型から取り出した製品は、凝固が完了すると
非製品形状部を切除して中空部の残留ガスを排出し、ガ
ス残留による悪影響を取り除く。
On the other hand, when the product taken out of the mold is completely solidified, the non-product-shaped portion is cut off to discharge the residual gas in the hollow portion, thereby removing the adverse effect due to the residual gas.

(実施例) 本発明の製造方法の実施例について添付した図面に基
づき説明する。
(Example) An example of the manufacturing method of the present invention will be described with reference to the attached drawings.

第1図は本発明を実施するための金型装置の1例を示
す全体面、第2図は要部拡大図、第3図,第4図は他の
実施例を示す要部拡大図である。
1 is an overall view showing one example of a mold apparatus for carrying out the present invention, FIG. 2 is an enlarged view of a main part, and FIGS. 3 and 4 are enlarged views of a main part showing another embodiment. is there.

第1図に示すように、射出金型装置1は、固定型取付
板2に取り付けられた固定型本体3と、可動型取付板4
にスペーサ5を介して取り付けられた可動型本体6を備
えており、可動型本体6は固定型本体3上で昇降動して
型開き、型閉めするよう構成されるとともに、型合せし
た両金型本体3,6の分割面にはキャビティ8が形成され
ている。そしてこのキャビティ8内に溶融樹脂27を射出
するためのスプールブッシュ9が固定型本体3に嵌め込
まれている。
As shown in FIG. 1, the injection mold apparatus 1 comprises a fixed main body 3 mounted on a fixed mounting plate 2 and a movable mounting plate 4.
And a movable body 6 attached to the fixed body 3 via a spacer 5. The movable body 6 is configured to move up and down on the fixed body 3 to open and close the mold. Cavities 8 are formed in the divided surfaces of the mold bodies 3 and 6. A spool bush 9 for injecting the molten resin 27 into the cavity 8 is fitted into the fixed main body 3.

可動型取付板4には、上下進退動可能な押出板10と、
この押出板10に取り付けられた押出ピン11が設けられ、
この押出ピン11は可動型本体6を摺動自在に貫いて、そ
の先端部をキャビティ面に臨ませている。
The movable mounting plate 4 includes an extruding plate 10 that can move up and down,
An extrusion pin 11 attached to the extrusion plate 10 is provided,
The push-out pin 11 slidably penetrates the movable mold body 6 and has a tip portion facing the cavity surface.

一方、キャビティ8には、製品として成形する製品形
状部12と、非製品として成形する非製品形状部13が連接
して設けられ、例えば、第5図に示すように、製品形状
部12の一部から突出させて成形した非製品形状部13を、
成形が完了した後に刃具Cで切除するように構成してい
る。そしてこの非製品形状部13から、以下に述べるガス
注入機構15によってガスを注入し、又、その際形成され
る樹脂27のガス通路14をガス通路封鎖機構16によって封
鎖する。そしてこのような非製品形状部13は、製品の大
きさ等によって2ヶ所以上の複数設けることもある。
On the other hand, the cavity 8 is provided with a product-shaped part 12 to be molded as a product and a non-product-shaped part 13 to be molded as a non-product, and is provided, for example, as shown in FIG. Non-product shaped part 13 formed by projecting from the part,
It is configured to cut off with the cutting tool C after the forming is completed. A gas is injected from the non-product shaped portion 13 by a gas injection mechanism 15 described below, and the gas passage 14 of the resin 27 formed at that time is closed by a gas passage closing mechanism 16. Such a non-product shape portion 13 may be provided at two or more places depending on the size of the product.

ガス注入機構15は可動型本体6に組み込まれており、
第2図に示すように油圧シリンダユニット17のシリンダ
内で摺動するピストン18と、このピストン18に一体的に
結合されるピン19を備え、ピストン18の下動によって、
ノズル孔21を摺動するピン19先端で非製品形状部13の樹
脂27を表層に孔をあけ、次いでピストン18を上動させて
ノズル孔21を開放し、ガス供給路20から送られる高圧ガ
スを注入するようにしている。
The gas injection mechanism 15 is incorporated in the movable body 6,
As shown in FIG. 2, a piston 18 is slid in the cylinder of the hydraulic cylinder unit 17, and a pin 19 is integrally connected to the piston 18.
The resin 27 of the non-product shaped part 13 is pierced on the surface layer with the tip of the pin 19 sliding in the nozzle hole 21, then the piston 18 is moved upward to open the nozzle hole 21, and the high-pressure gas sent from the gas supply path 20 is opened. I try to inject.

一方、ガス通路封鎖機構16は、固定型本体3に組み込
まれており、圧縮用油圧シリンダユニット22によって進
退動する圧接部材23をヒータ24で加熱するようにしてい
る。そしてこの加熱温度を所定温度に保持するためサー
モスタット25を設けている。そして圧接部材23先端を非
製品形状部13のガス通路14部に臨ませており、圧接部材
23を進動させてガス通路14を塞ぎ、同時にヒータ24で加
熱して表層部を溶着する。
On the other hand, the gas passage closing mechanism 16 is incorporated in the fixed type main body 3, and heats the pressure contact member 23 which is advanced and retracted by the hydraulic cylinder unit 22 for compression by the heater 24. A thermostat 25 is provided to maintain the heating temperature at a predetermined temperature. The distal end of the pressure contact member 23 faces the gas passage 14 of the non-product shaped portion 13, and the pressure contact member 23
The gas passage 14 is closed by advancing 23 and, at the same time, the surface layer is welded by heating by the heater 24.

このように構成した射出金型装置1において、固定型
本体3と可動型本体6が型合せしたキャビティ8にスプ
ルーブッシュ9部を介して溶融樹脂27を注入し、次いで
ガス注入機構15によって高圧ガスを注入する。この際、
前述のようにガス注入機構15のピン19先端が下降して半
凝固状の表層に孔をあけると再びピン19は上昇してノズ
ル孔21を開放する。このため、例えば600気圧程度に加
圧されている窒素ガス等の高圧ガスは、ガス供給路20、
ノズル孔21を通って表層の孔から樹脂27内部に入り込
み、内部の未凝固の溶融樹脂を金型壁面に向けて押しつ
けながら深部まで侵入する。
In the injection mold apparatus 1 configured as described above, the molten resin 27 is injected through the sprue bush 9 into the cavity 8 in which the fixed mold body 3 and the movable mold body 6 are combined. Inject. On this occasion,
As described above, when the tip of the pin 19 of the gas injection mechanism 15 moves down to make a hole in the semi-solid surface, the pin 19 rises again to open the nozzle hole 21. For this reason, for example, high-pressure gas such as nitrogen gas pressurized to about 600 atm, the gas supply path 20,
Through the nozzle hole 21, the resin enters the inside of the resin 27 from the hole in the surface layer, and penetrates deep into the resin 27 while pressing the unsolidified molten resin toward the mold wall surface.

こうして高圧で樹脂内に入り込んだガスの製品形状部
における占有空間は、中空部28として形成されることと
なるが、本発明の場合は、そのまま高圧を保持して凝固
させるのではなく、この注入ガスの一部を途中で排出す
る。
The space occupied by the gas that has entered the resin at a high pressure in the product shape portion is formed as a hollow portion 28. In the case of the present invention, the gas is not solidified while maintaining the high pressure as it is. Part of the gas is exhausted on the way.

すなわちガスを供給したガス供給通路20からガスを還
流させて、約600気圧程度の圧力を約1.5〜5気圧程度に
減圧する。この減圧後の圧力は凝固時の成形収縮による
ひけを防止するため内部から支えておくに充分な圧力で
あり、凝固が完了するまで中空部28の圧力をこの約1.5
〜5気圧の範囲で保持しておくものである。
That is, the gas is recirculated from the gas supply passage 20 to which the gas is supplied, and the pressure of about 600 atm is reduced to about 1.5 to 5 atm. The pressure after the pressure reduction is a pressure sufficient to support from the inside to prevent sink due to molding shrinkage during solidification, and the pressure of the hollow portion 28 is increased by about 1.5 until solidification is completed.
The pressure is kept in a range of up to 5 atm.

こうして所定圧までの減圧が完了すると前述の要領で
ガス通路封鎖機構16によりガス通路14を塞ぐ。
When the pressure reduction to the predetermined pressure is completed, the gas passage closing mechanism 16 closes the gas passage 14 as described above.

ガス通路14の封鎖が完了すると型開きして製品を取り
出し、完全凝固させる。そして凝固が終えると第5図に
示すように非製品形状部13を切り落し、同時に中空内部
28の残留ガスを排出する。
When the gas passage 14 is completely closed, the mold is opened and the product is taken out and completely solidified. When solidification is completed, the non-product shaped part 13 is cut off as shown in FIG.
Discharge 28 residual gases.

かかる方法によれば、金型で拘束したまま完全凝固さ
せる場合に較べて、早い段階で型から取り出せるため生
産性を高めることが出来る。
According to this method, productivity can be improved because the solid can be taken out of the mold at an earlier stage as compared with a case where the solidification is completely performed while being restrained by the mold.

次に第3図は、ガス通路封鎖機構の別実施例を示すも
のである。
Next, FIG. 3 shows another embodiment of the gas passage closing mechanism.

この実施例のガス通路封鎖機構16は、非製品形状部13
のガス通路14を通路方向に沿って押し潰すよう構成さ
れ、圧接部材23が水平方向に進退動自在とされている。
このため第3図(A)の状態でガスが注入され中空部28
が形成された後、所定圧まで減圧されると圧縮用油圧シ
リンダユニット22によって圧接部材23が進動し、同時に
先端部をヒータ24で加熱して(B)図のようにガス通路
14を封鎖する。
The gas passage closing mechanism 16 of this embodiment includes a non-product shape portion 13.
The gas passage 14 is configured to be crushed along the direction of the passage, so that the press-contact member 23 is movable in the horizontal direction.
For this reason, gas is injected in the state of FIG.
Is formed, when the pressure is reduced to a predetermined pressure, the pressure contact member 23 is advanced by the hydraulic cylinder unit 22 for compression, and at the same time, the distal end is heated by the heater 24, and as shown in FIG.
Block 14

次に第4図は、ガス通路封鎖機構の更に別の実施例を
示すものであり、ガス注入機構と一体的に構成したもの
である。
Next, FIG. 4 shows still another embodiment of the gas passage closing mechanism, which is configured integrally with the gas injection mechanism.

すなわちこのガス注入・封鎖機構30は、前述のガス注
入機構15とガス通路封鎖機構16を一体にして構成したも
のであり、シリンダケース31内に第1ピストン32を備
え、この第1ピストン32内には第2ピストン33が設けら
れている。そして第1ピストン32の上下動駆動用の油圧
ライン34,35と第2ピストン33下動用の油圧ライン36が
設けられ、又第2ピストン33上動のため第1ピストン32
にオイル通路37を設けて油圧ライン34側に連通させてい
る。そして油圧ライン36は第2ピストン33後面側に結合
するピストンロッド38の中心に設けている。
That is, the gas injection / sealing mechanism 30 is configured by integrating the gas injection mechanism 15 and the gas passage closing mechanism 16 described above, and includes a first piston 32 in a cylinder case 31, Is provided with a second piston 33. Hydraulic lines 34, 35 for vertically moving the first piston 32 and a hydraulic line 36 for lowering the second piston 33 are provided.
An oil passage 37 is provided to communicate with the hydraulic line 34 side. The hydraulic line 36 is provided at the center of the piston rod 38 connected to the rear side of the second piston 33.

又、第2ピストン33の前面側には圧接部材40を結合し
ている。そしてこの圧接部材40の途中にはヒータ41を設
けるとともに、シリンダケース31との間の摺動部に適宜
シール部材45,46を配設し、又その下端部がノズル孔42
内を摺動するようにしている。そしてこのノズル孔42に
はガス供給路43の開口部が臨んでいる。
A pressure contact member 40 is connected to the front side of the second piston 33. A heater 41 is provided in the middle of the pressure contact member 40, and seal members 45 and 46 are appropriately disposed in a sliding portion between the pressure contact member 40 and the cylinder case 31.
It slides inside. The opening of the gas supply passage 43 faces the nozzle hole 42.

圧接部材40の先端部には、樹脂表層に孔をあけるため
のピン44が内蔵されている。そしてこのピン44は、例え
ば圧接部材40との間にスプリング48を介して取り付けら
れるとともに、圧接部材40の降下が所定位置まで達する
とピン44のみその位置で停止して圧接部材40のみが降下
するように係止部49を備えている。
A pin 44 for making a hole in the resin surface layer is built in the distal end portion of the pressing member 40. The pin 44 is attached to, for example, the press-contact member 40 via a spring 48, and when the press-contact member 40 reaches a predetermined position, only the pin 44 stops at that position and only the press-contact member 40 drops. Locking portion 49 as shown in FIG.

こうして構成されたガス注入・封鎖機構30においてま
ず第4図(A)に示すように第2ピストン33を上動させ
第1ピストン32を下動させた状態でキャビティ内に溶融
樹脂を射出する。この際非製品形状部13からノズル孔42
の入口附近まで充填される溶融樹脂27の表層は、下方に
突出するピン44で孔があけられたと同じ状態で半凝固状
となる。
In the gas injection / sealing mechanism 30 configured as described above, first, as shown in FIG. 4A, the molten resin is injected into the cavity with the second piston 33 moved upward and the first piston 32 moved downward. At this time, the nozzle hole 42
The surface layer of the molten resin 27 filled up to the vicinity of the inlet becomes semi-solid in the same state as the hole formed by the pin 44 projecting downward.

次いで(B)図に示すように油圧ライン34に油を供給
して第1ピストン32を上動させると、それまで塞がれて
いたガス供給路43の開口が開放されて、高圧ガスがノズ
ル孔42から流れ込み、樹脂内部に入り込む。そしてガス
流路が中空部として形成されることとなる。
Next, when the first piston 32 is moved upward by supplying oil to the hydraulic line 34 as shown in FIG. 2B, the opening of the gas supply passage 43 which has been closed is opened, and the high-pressure gas is It flows from the hole 42 and enters the inside of the resin. Then, the gas flow path is formed as a hollow portion.

次に、中空部を形成したガスの一部がガス供給路43か
ら排出される。そして所定のガス圧まで減圧されるとガ
ス通路の封鎖を行なう。すなわち(C)図に示すように
油圧ライン35から油圧をかけて第1ピストン32を降下さ
せるとともに、油圧ライン36からも油圧をかけて第2ピ
ストン33を降下させる。このためノズル孔42の一部にま
で入り込んでいた樹脂は圧接部材40先端で押し潰されて
孔が塞がり、同時に加熱されて同部の溶着が行なわれ
る。
Next, a part of the gas forming the hollow portion is discharged from the gas supply path 43. When the pressure is reduced to a predetermined gas pressure, the gas passage is closed. That is, as shown in FIG. 3C, the first piston 32 is lowered by applying hydraulic pressure from the hydraulic line 35, and the second piston 33 is also lowered by applying hydraulic pressure from the hydraulic line 36. For this reason, the resin that has penetrated into a part of the nozzle hole 42 is crushed by the tip of the pressure contact member 40 to close the hole, and is heated at the same time to weld the same.

(発明の効果) 以上のように本発明の中空樹脂製品の製造方法は、成
形品の中空部に一部のガスを残留させたまま取り出すよ
うにしたため、早期取出しによるひけ或いは変形等の成
形不良の悪影響を防止しながら生産性を高めることが出
来る。
(Effect of the Invention) As described above, in the method for manufacturing a hollow resin product of the present invention, since a part of the gas is taken out while remaining in the hollow part of the molded product, molding defects such as sink or deformation due to early removal are made. Productivity can be improved while preventing the adverse effects of

又取り出した成形体のうち非製品形状部を切除して、
中空部の残留ガスもすべて排出するため、その後の悪影
響もない。
Also, cut out the non-product shape part of the molded product taken out,
Since all residual gas in the hollow portion is also discharged, there is no adverse effect thereafter.

【図面の簡単な説明】[Brief description of the drawings]

第1図は本発明を実施するための金型装置の1例を示す
全体図、第2図は要部拡大図、第3図,第4図は他の実
施例を示す要部拡大図、第5図は非製品形状部の切除を
示す説明図である。 尚同図中、1は射出金型装置、8はキャビティ、12は製
品形状部、13は非製品形状部、15はガス注入機構、16は
ガス通路封鎖機構、23は圧接部材、28は中空部、30はガ
ス注入・封鎖機構、40は圧接部材を示す。
1 is an overall view showing an example of a mold apparatus for carrying out the present invention, FIG. 2 is an enlarged view of a main part, FIGS. 3 and 4 are enlarged views of a main part showing another embodiment, FIG. 5 is an explanatory view showing the cutting of the non-product shaped part. In the same figure, 1 is an injection mold device, 8 is a cavity, 12 is a product shape portion, 13 is a non-product shape portion, 15 is a gas injection mechanism, 16 is a gas passage closing mechanism, 23 is a pressure contact member, and 28 is a hollow member. Reference numeral 30 denotes a gas injection / sealing mechanism, and 40 denotes a press-contact member.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 市川 輝男 埼玉県狭山市新狭山1丁目10番地1 ホ ンダエンジニアリング株式会社内 (56)参考文献 特開 平3−274120(JP,A) 特開 平2−289327(JP,A) 特開 平1−157823(JP,A) (58)調査した分野(Int.Cl.6,DB名) B29C 45/00 - 45/84 B29L 22:00──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Teruo Ichikawa 1-10-1 Shinsayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. (56) References JP-A-3-274120 (JP, A) 2-289327 (JP, A) JP-A-1-157823 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) B29C 45/00-45/84 B29L 22:00

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】金型キャビティに溶融樹脂を射出し、この
溶融樹脂内にガスを注入して中空部を形成するようにし
た中空樹脂製品の製造方法において、 この方法は、金型キャビティの製品形状部に溶融樹脂を
射出し、その後製品形状部に連なる非製品形状部からガ
スを注入する第1工程と、注入したガスの一部を排出し
て所定圧に減圧し、その後非製品形状部のガス通路を封
鎖する第2工程と、その製品を金型から取り出し、その
後非製品形状部を切除して中空部の残留ガスを排出する
第3工程からなることを特徴とする中空樹脂製品の製造
方法。
1. A method of manufacturing a hollow resin product wherein a molten resin is injected into a mold cavity and a gas is injected into the molten resin to form a hollow portion. A first step of injecting a molten resin into the shaped part and subsequently injecting a gas from the non-product shaped part connected to the product shaped part, and discharging a part of the injected gas to reduce the pressure to a predetermined pressure, and thereafter, And a third step of removing the product from the mold, cutting off the non-product shape part and discharging the residual gas in the hollow part. Production method.
JP19194090A 1990-07-20 1990-07-20 Manufacturing method of hollow resin products Expired - Fee Related JP2788669B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19194090A JP2788669B2 (en) 1990-07-20 1990-07-20 Manufacturing method of hollow resin products

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19194090A JP2788669B2 (en) 1990-07-20 1990-07-20 Manufacturing method of hollow resin products

Publications (2)

Publication Number Publication Date
JPH0478510A JPH0478510A (en) 1992-03-12
JP2788669B2 true JP2788669B2 (en) 1998-08-20

Family

ID=16282988

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19194090A Expired - Fee Related JP2788669B2 (en) 1990-07-20 1990-07-20 Manufacturing method of hollow resin products

Country Status (1)

Country Link
JP (1) JP2788669B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2743770B2 (en) * 1993-05-31 1998-04-22 橋本フォーミング工業株式会社 Resin molded product having cavity inside and manufacturing method
JP5644179B2 (en) * 2010-05-27 2014-12-24 トヨタ自動車株式会社 Injection molding apparatus and injection molding method
DE102012014013B4 (en) * 2012-07-17 2022-02-24 Illinois Tool Works Inc. Method and device for producing a plastic part, in particular a plastic part for an automobile, in an injection molding process
CN110328285B (en) * 2019-08-28 2020-07-24 浙江华荣电池股份有限公司 Hot punching die structure

Also Published As

Publication number Publication date
JPH0478510A (en) 1992-03-12

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