JPH0459214A - Molding die - Google Patents
Molding dieInfo
- Publication number
- JPH0459214A JPH0459214A JP17172590A JP17172590A JPH0459214A JP H0459214 A JPH0459214 A JP H0459214A JP 17172590 A JP17172590 A JP 17172590A JP 17172590 A JP17172590 A JP 17172590A JP H0459214 A JPH0459214 A JP H0459214A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- gas inflow
- resin
- space
- inflow section
- 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.)
- Pending
Links
- 238000000465 moulding Methods 0.000 title claims description 22
- 239000011347 resin Substances 0.000 claims abstract description 24
- 229920005989 resin Polymers 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 abstract description 4
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000007730 finishing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
Classifications
-
- 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
- B29C45/1704—Introducing 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
- B29C45/1705—Introducing 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 using movable mould parts
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、中空状の厚肉部もしくは中空状の偏肉部を有
する成形品を成形する成形金型に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mold for molding a molded product having a hollow thick-walled portion or a hollow uneven-walled portion.
（従来の技術）
従来、中空状の厚肉部もしくは偏肉部を有する成形品を
成形する成形金型においては、金型のキャビティ内にガ
スを流入させるためのガス流入部（このガス流入部が成
形品において中空状の厚肉部もしくは中空状の偏肉部を
形成する部分となる。）を形成し、成形時においてキャ
ビティに充填された溶融樹脂中にガスを注入することで
、厚肉部もしくは偏肉部に生じるヒケを防止していた。(Prior Art) Conventionally, in a mold for molding a molded product having a hollow thick-walled part or uneven-walled part, a gas inflow part (this gas inflow part) is used to cause gas to flow into the cavity of the mold. This is the part that forms a hollow thick-walled part or hollow uneven-walled part in a molded product.), and by injecting gas into the molten resin filled in the cavity during molding, This prevents sink marks from occurring in areas with uneven thickness.
（発明が解決しようとする課題）
しかしながら、上記従来のものでは、ガス流入部の先端
までガスを流すのは難しいため、成形品においてガス流
入部の先端部周辺のガスの流れなかった部位でヒケが生
じていた。(Problem to be Solved by the Invention) However, with the above-mentioned conventional device, it is difficult to allow the gas to flow to the tip of the gas inlet, and therefore, molded products suffer from sinks in areas around the tip of the gas inlet where the gas does not flow. was occurring.
（課題を解決するための手段）
本発明の成形金型は、厚肉部もしくは偏肉部を有する成
形品を成形する金型において、金型のキャビティには、
該キャビティ内にガスを流入させるためのガス流入部が
形成されるとともに、ガス流入部のガス流入方向の先端
部に該ガス流入部から樹脂が流入可能な空間部が形成さ
れ、ガス流入部から空間部への樹脂の流入を許容もくし
は阻止自在に構成されたものである。(Means for Solving the Problems) The molding die of the present invention is a mold for molding a molded product having a thick wall portion or an uneven thickness portion, and the mold cavity includes:
A gas inflow portion is formed to allow gas to flow into the cavity, and a space portion into which resin can flow from the gas inflow portion is formed at the tip of the gas inflow portion in the gas inflow direction. It is configured to allow or prevent resin from flowing into the space.
（作用）
ガス流入部へガスを注入する時、ガス流入部の先端部か
ら空間部への樹脂の流入を許容することで、ガスはガス
流入部の樹脂をこの空間部に押し流し、これによりガス
がガス流入部の先端部まで流入する。(Function) When injecting gas into the gas inflow part, by allowing the resin to flow from the tip of the gas inflow part into the space, the gas will force the resin in the gas inflow part into this space, which will cause the gas to flow into the space. flows up to the tip of the gas inlet.
（実施例） 以下、本発明の一実施例を図面を参照して説明する。(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第１図は、厚肉部もしくは偏肉部を有する成形品を成形
する金型のキャビティを示している。FIG. 1 shows a cavity of a mold for molding a molded product having a thick wall portion or uneven wall thickness portion.
同図において、１は図示しない他方の型とにより金型を
構成する一方の型で、一方の型１と他方の型との合わせ
面にはキャビティ２が形成されている。In the figure, reference numeral 1 denotes one mold that constitutes a metal mold together with another mold (not shown), and a cavity 2 is formed in the mating surface of one mold 1 and the other mold.
キャビティ２にはガス流入部３が形成されている。ガス
流入部３は、成形品においてリブなどの厚肉部もしくは
偏肉部となる部分であり、成形機の射出ノズルもしくは
金型適所から注入されるガスの流入路となる。このガス
流入部３にガスが流入することで、厚肉部もしくは偏肉
部は中空状になる。A gas inflow portion 3 is formed in the cavity 2 . The gas inflow portion 3 is a thick walled portion or uneven thickness portion such as a rib in the molded product, and serves as an inflow path for gas injected from an injection nozzle of a molding machine or a proper position of a mold. As the gas flows into the gas inflow portion 3, the thick portion or the uneven thickness portion becomes hollow.
ガス流入部３のガス流入方向の先端には、空間部５が形
成されている。空間部５には可動部材６が例えば油圧や
ガス圧などを利用した適宜な手段により移動自在に設け
られており、可動部材６が空間部５にある位置（第２図
参照）と、下方に移動して空間部５にガス流入部３から
の樹脂の流入が可能な位置（第３図参照）とを取ること
ができる。A space 5 is formed at the tip of the gas inflow section 3 in the gas inflow direction. A movable member 6 is provided in the space 5 so as to be movable by an appropriate means using, for example, hydraulic pressure or gas pressure. It can be moved to a position (see FIG. 3) where resin can flow into the space 5 from the gas inflow section 3.
次に、このように構成された金型を用いた成形プロセス
について説明する。Next, a molding process using the mold configured as described above will be explained.
まず、第２図に示すように、可動部材６で空間部５に樹
脂が流れ込まない状態にしてこの状態でキャビティ２内
に溶融樹脂を射出充填する。樹脂が充填すると、その直
後もしくは所定時間経過した後にガスを例えば射出ノズ
ルからゲートを介してガス流入部３に注入する。このよ
うにガス流入部３にガスを流入し始めると、可動部材６
が第３図に示すように下方に移動してガス流入部３の先
端部に空間部５を形成する。これにより、ガス流入部３
の樹脂はガスの流入作用により空間部５側に押し出され
る形となり、空間部５に樹脂が充填することで、第４図
に示すようにガス７がガス流入部３の先端部まで流入す
る。First, as shown in FIG. 2, the movable member 6 is used to prevent the resin from flowing into the space 5, and in this state, the cavity 2 is injected and filled with molten resin. Immediately after the resin is filled or after a predetermined period of time has elapsed, gas is injected into the gas inflow portion 3 from, for example, an injection nozzle through a gate. When gas starts to flow into the gas inflow section 3 in this way, the movable member 6
moves downward to form a space 5 at the tip of the gas inlet 3 as shown in FIG. As a result, the gas inflow section 3
The resin is pushed out toward the space 5 by the gas inflow action, and by filling the space 5 with resin, the gas 7 flows up to the tip of the gas inlet 3 as shown in FIG.
この後、ガス圧により保圧が行われた後、ガスを抜き、
冷却工程で冷却して成形品が成形される。After this, after the pressure is maintained by gas pressure, the gas is released,
The molded product is formed by cooling in the cooling process.
なお、空間部５０体積は金型固有の値であり、適宜に設
定すればよい。Note that the volume of the space 50 is a value specific to the mold, and may be set as appropriate.
また、空間部５に樹脂が充填されることで空間部５の樹
脂も成形品の一部となって成形されることになるが、こ
の部分が不要であれば仕上げ工程で切断すればよい。Furthermore, by filling the space 5 with resin, the resin in the space 5 also becomes part of the molded product, but if this part is unnecessary, it can be cut in the finishing process.
第５図は、本発明に係る他の実施例を示している。なお
、前記実施例と同様のものには同符号を付し、ここでの
説明は省略する。FIG. 5 shows another embodiment according to the invention. Components similar to those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted here.
本例は、ガス流入部３のガス流入方向の先端に溜り部１
０（空間部）を連通部１１を介して設け、この連通部１
１に可動部材１２を設け、可動部材１２の移動によりガ
ス流入部３と溜り部１ｏとを連通もしくは遮蔽自在に構
成したものである。In this example, a reservoir 1 is provided at the tip of the gas inflow section 3 in the gas inflow direction.
0 (space part) is provided via the communication part 11, and this communication part 1
1 is provided with a movable member 12, and by movement of the movable member 12, the gas inflow portion 3 and the reservoir portion 1o can be freely communicated or shielded.
ガス流入部３へのガス注入時において、可動部材１２を
連通部１１から退け、ガス流入部３の先端部と溜り部１
０とを連通させることで、溜り部ＩＯに樹脂を流入させ
る。これにより第６図に示すようにガス７をガス流入部
３の先端部まできれいに流入させることができる。When injecting gas into the gas inflow section 3, the movable member 12 is moved away from the communication section 11, and the tip of the gas inflow section 3 and the reservoir section 1 are removed.
0, the resin flows into the reservoir portion IO. This allows the gas 7 to flow neatly to the tip of the gas inlet 3 as shown in FIG.
このように前記各実施例で説明した本発明の成形金型を
用い、ポリプロピレン（ＰＰ）により下記の成形条件で
成形品を成形した場合には、ガス７はガス流入部３の先
端部まできれいに流れた（第４図及び第６図参照）。In this way, when a molded article is molded from polypropylene (PP) under the following molding conditions using the molding die of the present invention explained in each of the above embodiments, the gas 7 will flow cleanly to the tip of the gas inlet 3. (See Figures 4 and 6).
成形条件：樹脂温度２４０度、金型温度４５度、ガス圧
力２０ｋｇ／ｃｄ
また、上記と同様な成形条件のもとで、可動部材６．１
２を移動させなかった場合、つまり従来の成形金型を用
いた場合には、第７図に示すように、ガス７はガス流入
部３の先端まで流れなかった。Molding conditions: resin temperature 240 degrees, mold temperature 45 degrees, gas pressure 20 kg/cd Also, under the same molding conditions as above, the movable member 6.1
2 was not moved, that is, when a conventional molding die was used, the gas 7 did not flow to the tip of the gas inflow portion 3, as shown in FIG.
（発明の効果）
以上述べたように、本発明の成形金型によれば、ガスを
ガス流入部の先端部まできれいに流入させることができ
、ガスが流れないことに起因するヒケの発生を防止する
ことができる。(Effects of the Invention) As described above, according to the molding die of the present invention, gas can be caused to flow neatly to the tip of the gas inflow part, and the occurrence of sink marks caused by the gas not flowing can be prevented. can do.
第１図は厚肉部もしくは偏肉部を有する成形品を成形す
る成形金型のキャビティを示す斜視図、第２図及び第３
図は可動部材の移動動作を説明する説明図、第４図はガ
ス流入部へのガスの流入状態を示す図、第５図及び第６
図は他の実施例を示し、第５図は厚肉部もしくは偏肉部
を有する成形品を成形する成形金型のキャビティを示す
斜視図、第６図はガス流入部へのガスの流入状態を示す
図、第７図は、従来の成形金型によるガス流入部へのガ
スの流入状態を示す図である。
１０・・・溜り部（空間部）
１１・・・連通部Fig. 1 is a perspective view showing the cavity of a molding die for molding a molded product having a thick wall portion or uneven wall thickness portion, and Fig. 2 and 3
The figure is an explanatory diagram explaining the moving operation of the movable member, FIG. 4 is a diagram showing the state of gas inflow into the gas inflow section, and FIGS.
The figures show other embodiments, Fig. 5 is a perspective view showing the cavity of a molding die for molding a molded product having a thick wall portion or uneven wall thickness portion, and Fig. 6 is a state of gas inflow into the gas inflow portion. FIG. 7 is a diagram showing the state of gas inflow into the gas inflow portion by a conventional molding die. 10... Reservoir part (space part) 11... Communication part
Claims (1)
型において、 金型のキャビティには、該キャビティ内にガスを流入さ
せるためのガス流入部が形成されるとともに、ガス流入
部のガス流入方向の先端に該ガス流入部から樹脂が流入
可能な空間部が形成され、ガス流入部から空間部への樹
脂の流入を許容もくしは阻止自在に構成されたことを特
徴とする成形金型。[Scope of Claims] 1) In a mold for molding a molded product having a thick wall portion or uneven wall thickness portion, a gas inflow portion is formed in a cavity of the mold to allow gas to flow into the cavity. At the same time, a space portion into which resin can flow from the gas inflow portion is formed at the tip of the gas inflow portion in the gas inflow direction, and is configured to allow or prevent resin from flowing from the gas inflow portion into the space portion. A molding mold characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17172590A JPH0459214A (en) | 1990-06-28 | 1990-06-28 | Molding die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17172590A JPH0459214A (en) | 1990-06-28 | 1990-06-28 | Molding die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0459214A true JPH0459214A (en) | 1992-02-26 |
Family
ID=15928519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17172590A Pending JPH0459214A (en) | 1990-06-28 | 1990-06-28 | Molding die |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0459214A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002283424A (en) * | 2001-03-27 | 2002-10-03 | Nishikawa Kasei Co Ltd | Hollow resin injection-molded product and molding method therefor |
-
1990
- 1990-06-28 JP JP17172590A patent/JPH0459214A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002283424A (en) * | 2001-03-27 | 2002-10-03 | Nishikawa Kasei Co Ltd | Hollow resin injection-molded product and molding method therefor |
| JP4637393B2 (en) * | 2001-03-27 | 2011-02-23 | ダイキョーニシカワ株式会社 | Hollow resin injection molded product and molding method thereof |
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