JP3586752B2 - Pressurized gas supply device in hollow injection molding - Google Patents
Pressurized gas supply device in hollow injection molding Download PDFInfo
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- JP3586752B2 JP3586752B2 JP06040295A JP6040295A JP3586752B2 JP 3586752 B2 JP3586752 B2 JP 3586752B2 JP 06040295 A JP06040295 A JP 06040295A JP 6040295 A JP6040295 A JP 6040295A JP 3586752 B2 JP3586752 B2 JP 3586752B2
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- injection molding
- gas supply
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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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1732—Control circuits therefor
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- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【０００１】
【産業上の利用分野】
この発明は、中空射出成形における加圧ガス供給装置に関する。
【０００２】
【従来の技術】
金型に溶融した樹脂を射出した後、金型中の成形品の内部に加圧ガスを導入して保圧を行う中空射出成形は、従来より知られている（ＵＳＰ４１０６１７参照）。この中空射出成形を行う装置は、図３に示すように、上下金型(31)(32)内に溶融した樹脂(33)を射出するインジェクションノズル(34)と、加圧ガス(39)をインジェクションノズル(34)内に設けられた加圧ガス通路(35)に導入するガス導入管(36)と、インジェクションノズル(34)内に上下動自在に設けられかつ加圧ガス通路(35)の入口(35a) を開閉するエア作動弁(37)と、それぞれバルブ(42)(43)を有する２本のエア作動弁開閉用エア通路(40)(41)とを備えており、金型(31)(32)が樹脂により部分的に満たされたときに、エア作動弁(37)を開けて金型(31)(32)中の成形品(38)の内部に加圧ガス(39)を導入し、保圧を行うものである。
【０００３】
上記従来の中空射出成形装置において、加圧ガスの圧力は、図示省略された加圧ガス供給装置の加圧ガス圧力設定ラインに設けられた減圧弁により設定されている。
【０００４】
【発明が解決しようとする課題】
上記従来の中空射出成形装置では、成形品の形状が複雑になると、成形品の表面に凹みが生じる等の不良が多くなるという問題があった。
【０００５】
この発明の目的は、成形品の不良を少なくすることができる中空射出成形における加圧ガス供給装置を提供することにある。
【０００６】
【課題を解決するための手段】
この発明による中空射出成形における加圧ガス供給装置は、金型に溶融した樹脂を射出した後、金型中の成形品の内部に加圧ガスを導入して保圧を行う中空射出成形に用いられる加圧ガス供給装置であって、高圧ガスを減圧して所要の圧力の加圧ガスとする加圧ガス圧力設定ラインが複数列並列に設けられ、各圧力設定ラインは、ラインごとの圧力値を設定する減圧弁を有し、射出成形機に通じる充圧ラインと順次接続されるようになされており、第１の圧力設定ラインが充圧ラインに所定時間接続された後、第２の圧力設定ラインが充圧ラインに所定時間接続されることで、第１の加圧ガス圧力および保圧時間と第２の加圧ガス圧力および保圧時間とを有する圧力パターンによって、金型中の成形品内の加圧ガスの圧力が設定されることを特徴とするものである。
【０００７】
中空射出成形における加圧ガス供給装置は、上記加圧ガス圧力設定ラインを有する加圧ガス供給部と、ガスを所定の高圧まで加圧する加圧部とよりなり、加圧部は、１段目および２段目のガス増圧用プランジャーポンプと、各ポンプに設けられて高圧のガスを蓄える第１および第２タンクとを備えていることが好ましい。
【０００８】
また、加圧ガス圧力設定ラインの一端は、２段目の窒素ガス増圧用プランジャーポンプに接続され、他端には、充圧ラインに加えて、エア作動弁および流量調節弁を備え加圧ガスを減圧する減圧ラインと、加圧ガスを排出する排出ラインとが接続されていることがより好ましい。
【０００９】
各圧力設定ラインは、それぞれ、減圧弁、デジタル圧力計およびエア作動弁をこの順に備えていることがある。
【００１０】
また、加圧ガス供給部は、射出成形機が複数ある場合、複数設けられていることがある。
【００１１】
【作用】
この発明による中空射出成形における加圧ガス供給装置は、高圧ガスを減圧して所要の圧力の加圧ガスとする加圧ガス圧力設定ラインが複数列並列に設けられ、各圧力設定ラインは、ラインごとの圧力値を設定する減圧弁を有し、射出成形機に通じる充圧ラインと順次接続されるようになされており、第１の圧力設定ラインが充圧ラインに所定時間接続された後、第２の圧力設定ラインが充圧ラインに所定時間接続されることで、第１の加圧ガス圧力および保圧時間と第２の加圧ガス圧力および保圧時間とを有する圧力パターンによって、金型中の成形品内の加圧ガスの圧力が設定されるものであるから、各圧力設定ラインの加圧ガス圧力および保圧時間を成形品ごとに任意に設定することができる。
【００１２】
【実施例】
この発明の実施例を、以下図面を参照して説明する。
【００１３】
図１は、中空射出成形における加圧ガス供給装置のフロー図であり、加圧ガス供給装置は、窒素ガス発生機(1) と、窒素ガスを所定の高圧まで加圧する加圧部(2) と、金型中の成形品の内部に加圧ガスを供給する加圧ガス供給部(3) とよりなる。
【００１４】
加圧部(2) は、１段目および２段目の窒素ガス増圧用プランジャーポンプ(4)(5)と、各ポンプ(4)(5)に設けられて高圧の窒素ガスを蓄える第１および第２タンク(6)(7)とを備えている。各プランジャーポンプ(4)(5)の流量は、２Ｎｍ３ ／Ｈとされ、第１タンク(6) の容量は１リットル、第２タンク(7) の容量は２リットルとされている。
【００１５】
加圧ガス供給部(3) には、高圧の窒素ガスを金型中の成形品の内部に導入される加圧ガスに要求される圧力まで減圧する加圧ガス圧力設定ライン(11)(12)(13)が、３列並列に設けられている。加圧ガス圧力設定ライン(11)(12)(13)の一端は、２段目の窒素ガス増圧用プランジャーポンプ(5) に接続され、他端には、射出成形機のインジェクションノズルに連通する充圧ライン(23)と、加圧ガスを減圧する減圧ライン(25)と、加圧ガスを排出する排出ライン(28)とが接続されている。加圧ガス供給部(3) は、射出成形機が複数ある場合には、複数設けられる。
【００１６】
各圧力設定ライン(11)(12)(13)は、それぞれ、減圧弁(14)(15)(16)、デジタル圧力計(17)(18)(19)およびエア作動弁(20)(21)(22)をこの順に備えている。充圧ライン(23)は、デジタル圧力計(24)を備えている。減圧ライン(25)は、エア作動弁(26)および流量調節弁(27)を備えている。排出ライン(28)は、エア作動弁(29)を備えている。
【００１７】
窒素ガス発生機により発生された８〜９Ｋ（ｋｇ／ｃｍ２ ）の窒素ガスは、２段のポンプ(4)(5)によって、数百Ｋまで増圧されて、加圧ガス供給部(3) に送られる。加圧ガス供給部(3) の各圧力設定ライン(11)(12)(13)の圧力値は、例えば、第１列目の圧力設定ライン(11)が高、第２列目の圧力設定ライン(12)が中、第３列目の圧力設定ライン(13)が低とされ、エア作動弁(20)(21)(22)を開閉させることにより、この順に順次充圧ライン(23)と接続されていく。この場合の金型中の成形品内の加圧ガスの圧力の時間変化（圧力パターン）を図２に示す。金型中の成形品内の加圧ガスの圧力は、第１列目の圧力設定ライン(11)の圧力値に達し、この圧力が一定時間（ｔ１ からｔ２ までの数秒間）保持される。ここで、第２列目の圧力設定ライン(12)に切り換えられると、成形品内の加圧ガスの圧力は成形品の膨張に伴って第２列目の圧力設定ライン(12)の圧力まで減少し、その後第２列目の圧力設定ライン(12)の圧力が一定時間（ｔ３ からｔ４ までの数秒間）保持される。ここで、第３列目の圧力設定ライン(13)に切り換えられると、成形品内の加圧ガスの圧力は第３列目の圧力設定ライン(13)の圧力まで減少し、その後第３列目の圧力設定ライン(13)の圧力が一定時間（ｔ５ からｔ６ までの数秒間）保持される。このような圧力パターンは、成形品の形状に応じて、種々試験されて、加圧ガスの圧力および保圧時間の最適条件が見出される。
【００１８】
なお、上記実施例では、加圧ガス圧力設定ラインが３列設けられているが、加圧ガス圧力設定ラインは、２列以上であれば何列でもよい。圧力パターンを変更するための構成は、上記実施例以外にもあるが、上記のように圧力設定ライン(11)(12)(13)を複数列並列に設ける場合では、加圧部(2) の仕様を変更する必要がなく、簡単な構成で圧力パターンを変更することができるという利点を有している。
【００１９】
【発明の効果】
この発明の中空射出成形における加圧ガス供給装置によると、各圧力設定ラインの加圧ガス圧力および保圧時間を成形品ごとに任意に設定することができるので、これにより、成形品の形状に応じた加圧ガスの圧力パターンの最適条件を見出だして、成形品の不良を少なくすることができる。
【図面の簡単な説明】
【図１】この発明による中空射出成形における加圧ガス供給装置を概略的に示すフロー図である。
【図２】この加圧ガス供給装置により得られる圧力パターンの一例を示すグラフである。
【図３】従来の中空射出成形装置の１例を示す断面図である。
【符号の説明】
(2) 加圧部
(3) 加圧ガス供給部
(4)(5) 窒素ガス増圧用プランジャーポンプ
(6)(7) タンク
(11)(12)(13) 圧力設定ライン
(14)(15)(16) 減圧弁
(17)(18)(19) デジタル圧力計
(20)(21)(22) エア作動弁
(23) 充圧ライン
(25) 減圧ライン
(26) エア作動弁
(27) 流量調節弁
(28) 排出ライン [0001]
[Industrial applications]
The present invention relates to a pressurized gas supply device in hollow injection molding.
[0002]
[Prior art]
2. Description of the Related Art Hollow injection molding in which a molten resin is injected into a mold and then a pressure is introduced into a molded product in the mold to maintain a pressure is conventionally known (see US Pat. No. 4,106,617). As shown in FIG. 3, the apparatus for performing the hollow injection molding includes an injection nozzle (34) for injecting a molten resin (33) into upper and lower molds (31) and (32), and a pressurized gas (39). A gas introduction pipe (36) for introducing a pressurized gas passage (35) provided in the injection nozzle (34), and a gas introduction pipe (36) provided vertically movably in the injection nozzle (34). An air-operated valve (37) for opening and closing the inlet (35a), and two air-operated valve opening / closing air passages (40) (41) each having a valve (42) (43) are provided. When the resin (31) and (32) are partially filled, the air-operated valve (37) is opened and the pressurized gas (39) is placed inside the molded product (38) in the molds (31) and (32). To maintain the pressure.
[0003]
In the above conventional hollow injection molding apparatus, the pressure of the pressurized gas is set by a pressure reducing valve provided on a pressurized gas pressure setting line of a pressurized gas supply device (not shown).
[0004]
[Problems to be solved by the invention]
The above-mentioned conventional hollow injection molding apparatus has a problem that when the shape of a molded product becomes complicated, defects such as dents on the surface of the molded product increase.
[0005]
An object of the present invention is to provide a pressurized gas supply device in hollow injection molding that can reduce defects of a molded product.
[0006]
[Means for Solving the Problems]
The pressurized gas supply device in the hollow injection molding according to the present invention is used for hollow injection molding in which a molten resin is injected into a mold and then a pressurized gas is introduced into a molded product in the mold to maintain the pressure. A plurality of rows of pressurized gas pressure setting lines which are decompressed from a high pressure gas to obtain a pressurized gas having a required pressure , and each pressure setting line has a pressure value for each line. And a pressure reducing valve for setting the first pressure setting line to the injection molding machine. The first pressure setting line is connected to the charging line for a predetermined time, and then the second pressure is set to the second pressure. The setting line is connected to the pressure line for a predetermined time, so that the pressure pattern having the first pressurized gas pressure and the dwelling time and the second pressurized gas pressure and the dwelling time allows the molding in the mold to be performed. that the pressure of the pressurized gas in the goods is set It is an butterfly.
[0007]
The pressurized gas supply device in the hollow injection molding includes a pressurized gas supply unit having the above-described pressurized gas pressure setting line, and a pressurizing unit that pressurizes the gas to a predetermined high pressure. It is preferable to include a plunger pump for increasing the pressure of the second and third stages, and first and second tanks provided in each pump for storing high-pressure gas .
[0008]
One end of the pressurized gas pressure setting line is connected to a second-stage nitrogen gas pressure-increasing plunger pump, and the other end is provided with an air-operated valve and a flow control valve in addition to the charging line. More preferably, a pressure reducing line for reducing the pressure of the gas and a discharge line for discharging the pressurized gas are connected .
[0009]
Each pressure setting line may include a pressure reducing valve, a digital pressure gauge, and an air-operated valve in this order .
[0010]
When there are a plurality of injection molding machines, a plurality of pressurized gas supply units may be provided .
[0011]
[Action]
The pressurized gas supply device in the hollow injection molding according to the present invention is provided with a plurality of pressurized gas pressure setting lines arranged in parallel with each other in which a high-pressure gas is decompressed to obtain a pressurized gas having a required pressure. Each having a pressure reducing valve for setting a pressure value for each, is configured to be sequentially connected to the pressure line leading to the injection molding machine, after the first pressure setting line is connected to the pressure line for a predetermined time, When the second pressure setting line is connected to the pressure line for a predetermined time, the pressure pattern having the first pressurized gas pressure and the dwelling time and the second pressurized gas pressure and the dwelling time allows the gold pattern to be formed. Since the pressure of the pressurized gas in the molded article in the mold is set , the pressurized gas pressure and the dwell time of each pressure setting line can be arbitrarily set for each molded article.
[0012]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0013]
FIG. 1 is a flow chart of a pressurized gas supply device in hollow injection molding. The pressurized gas supply device includes a nitrogen gas generator (1) and a pressurizing section (2) for pressurizing nitrogen gas to a predetermined high pressure. And a pressurized gas supply unit (3) for supplying a pressurized gas to the inside of the molded article in the mold.
[0014]
The pressurizing section (2) includes plunger pumps (4) and (5) for increasing the pressure of the first and second stages of nitrogen gas, and a second pressure storage section provided in each of the pumps (4) and (5) for storing high-pressure nitrogen gas. A first tank and a second tank. The flow rates of the plunger pumps (4) and (5) are 2 Nm 3 / H, the capacity of the first tank (6) is 1 liter, and the capacity of the second tank (7) is 2 liters.
[0015]
The pressurized gas supply unit (3) has a pressurized gas pressure setting line (11) (12) for reducing the pressure of the high-pressure nitrogen gas to the pressure required for the pressurized gas introduced into the molded product in the mold. ) (13) are provided in three rows in parallel. One end of the pressurized gas pressure setting line (11), (12), (13) is connected to the second stage nitrogen gas pressure increasing plunger pump (5), and the other end is connected to the injection nozzle of the injection molding machine. A pressure line (23) for reducing the pressure, a pressure reducing line (25) for reducing the pressure of the pressurized gas, and a discharge line (28) for discharging the pressurized gas are connected. When there are a plurality of injection molding machines, a plurality of pressurized gas supply units (3) are provided.
[0016]
Each pressure setting line (11) (12) (13) is a pressure reducing valve (14) (15) (16), a digital pressure gauge (17) (18) (19), and an air operated valve (20) (21 ) (22) are provided in this order. The charging line (23) includes a digital pressure gauge (24). The pressure reducing line (25) includes an air operated valve (26) and a flow control valve (27). The discharge line (28) includes an air-operated valve (29).
[0017]
The nitrogen gas of 8 to 9 K (kg / cm 2 ) generated by the nitrogen gas generator is increased in pressure to several hundred K by two-stage pumps (4) and (5), and is supplied to the pressurized gas supply unit (3). ). The pressure values of the pressure setting lines (11), (12), and (13) of the pressurized gas supply unit (3) are, for example, as follows. The pressure setting line (13) in the third row is set to low while the line (12) is medium, and the air-operated valves (20), (21), (22) are opened and closed, and the charging line (23) It is connected with. FIG. 2 shows a change over time (pressure pattern) of the pressure of the pressurized gas in the molded product in the mold in this case. The pressure of the pressurized gas in the molded product in the mold reaches the pressure value of the first column of the pressure setting line (11), (a few seconds from t 1 to t 2) the pressure is a predetermined time is held You. Here, when the pressure is switched to the pressure setting line (12) in the second column, the pressure of the pressurized gas in the molded product is increased to the pressure in the pressure setting line (12) in the second column as the molded product expands. reduced, (several seconds from t 3 to t 4) after that the pressure in the second column of the pressure setting line (12) a predetermined time is held. Here, when the pressure is switched to the pressure setting line (13) in the third column, the pressure of the pressurized gas in the molded article decreases to the pressure in the pressure setting line (13) in the third column, and then the pressure in the third column is changed. eye pressure setting line (13) pressure is constant time (several seconds from t 5 to t 6) is held. Such a pressure pattern is subjected to various tests depending on the shape of the molded article, and optimum conditions for the pressure of the pressurized gas and the dwell time are found.
[0018]
In the above embodiment, three rows of the pressurized gas pressure setting lines are provided, but the number of the pressurized gas pressure setting lines may be any row as long as it is two or more rows. The configuration for changing the pressure pattern is not limited to the above embodiment, but when the pressure setting lines (11), (12), and (13) are provided in a plurality of rows in parallel as described above, the pressing unit (2) There is an advantage that the pressure pattern can be changed with a simple configuration without changing the specifications.
[0019]
【The invention's effect】
According to the pressurized gas supply device in the hollow injection molding of the present invention, the pressurized gas pressure and the dwell time of each pressure setting line can be arbitrarily set for each molded product. By finding the optimum condition of the pressure pattern of the pressurized gas according to the condition, it is possible to reduce defects of the molded product.
[Brief description of the drawings]
FIG. 1 is a flow diagram schematically showing a pressurized gas supply device in hollow injection molding according to the present invention.
FIG. 2 is a graph showing an example of a pressure pattern obtained by the pressurized gas supply device.
FIG. 3 is a sectional view showing an example of a conventional hollow injection molding apparatus.
[Explanation of symbols]
(2) Pressurizing section
(3) Pressurized gas supply section
(4) (5) Plunger pump for increasing nitrogen gas pressure
(6) (7) Tank
(11) (12) (13) Pressure setting line
(14) (15) (16) Reducing valve
(17) (18) (19) Digital pressure gauge
(20) (21) (22) Air operated valve
(23) Pressure line
(25) Decompression line
(26) Air operated valve
(27) Flow control valve
(28) Discharge line
Claims (5)
第１の圧力設定ラインが充圧ラインに所定時間接続された後、第２の圧力設定ラインが充圧ラインに所定時間接続されることで、第１の加圧ガス圧力および保圧時間と第２の加圧ガス圧力および保圧時間とを有する圧力パターンによって、金型中の成形品内の加圧ガスの圧力が設定されることを特徴とする中空射出成形における加圧ガス供給装置。A pressurized gas supply device used for hollow injection molding in which a molten resin is injected into a mold, and a pressurized gas is introduced into a molded product in the mold to maintain a pressure. A plurality of pressurized gas pressure setting lines for providing a pressurized gas having a required pressure are provided in parallel in a plurality of rows . Each pressure setting line has a pressure reducing valve for setting a pressure value for each line, and communicates with an injection molding machine. It is made to be connected sequentially with the charging line,
After the first pressure setting line has been connected to the pressure line for a predetermined time, the second pressure setting line has been connected to the pressure line for a predetermined time. A pressurized gas supply apparatus for hollow injection molding , wherein a pressure pattern of a pressurized gas in a molded product in a mold is set by a pressure pattern having a pressurized gas pressure and a dwell time of 2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06040295A JP3586752B2 (en) | 1995-03-20 | 1995-03-20 | Pressurized gas supply device in hollow injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06040295A JP3586752B2 (en) | 1995-03-20 | 1995-03-20 | Pressurized gas supply device in hollow injection molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08258074A JPH08258074A (en) | 1996-10-08 |
| JP3586752B2 true JP3586752B2 (en) | 2004-11-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06040295A Expired - Fee Related JP3586752B2 (en) | 1995-03-20 | 1995-03-20 | Pressurized gas supply device in hollow injection molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3586752B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100400457B1 (en) * | 2001-05-10 | 2003-10-01 | 엘지전자 주식회사 | Gas supplier for making foamed plastic |
| KR100465686B1 (en) * | 2001-12-19 | 2005-01-13 | 엘지전자 주식회사 | Plastic maker including gas |
| KR100465687B1 (en) * | 2001-12-21 | 2005-01-13 | 엘지전자 주식회사 | Gas supplier for plastic maker including gas |
| CN100439072C (en) * | 2002-07-04 | 2008-12-03 | 三菱工程塑料株式会社 | Pressurized gas introducing device, and injection molding method for moldings having hollow portion |
-
1995
- 1995-03-20 JP JP06040295A patent/JP3586752B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08258074A (en) | 1996-10-08 |
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