WO2024014142A1 - Mold for injection molding and molding method - Google Patents
Mold for injection molding and molding method Download PDFInfo
- Publication number
- WO2024014142A1 WO2024014142A1 PCT/JP2023/019531 JP2023019531W WO2024014142A1 WO 2024014142 A1 WO2024014142 A1 WO 2024014142A1 JP 2023019531 W JP2023019531 W JP 2023019531W WO 2024014142 A1 WO2024014142 A1 WO 2024014142A1
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- WIPO (PCT)
- Prior art keywords
- cavity
- mold
- groove
- overflow
- molded product
- Prior art date
Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 239000002861 polymer material Substances 0.000 claims description 11
- 238000005520 cutting process Methods 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 21
- 239000000463 material Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011342 resin composition Substances 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 229920000426 Microplastic Polymers 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004634 thermosetting polymer Substances 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
- B29C45/26—Moulds
Definitions
- the present invention relates to an injection mold, and particularly to an injection mold that can reduce the frequency of maintenance related to gas vent cleaning, and a molding method using the mold.
- Injection molding is a process in which a thermoplastic polymer material melted by heating is filled under high pressure into a hollow part called a cavity carved into a mold, and then cooled and solidified to obtain a molded product, resulting in high productivity. and is widely practiced. In some cases, it is also used to mold thermosetting polymer materials.
- Patent Document 1 includes injection molding of a thermoplastic resin composition at a mold temperature T° C. of 80° C. or higher using a mold provided with a cavity and a gas vent. , a method for manufacturing a molded article, wherein the total amount of gas collected in the gas vent part during the injection molding is c; of the gas collected in the gas vent part, the boiling point is less than (T + 20) ° C.
- A is the amount of gas having a boiling point of (T-20)°C or higher among the gases collected at the gas vent part; , ⁇ g/1 g of thermoplastic resin composition), a manufacturing method is disclosed, characterized in that the value of gas burn occurrence risk d expressed by a specific calculation formula is 35 or less. has been done.
- an object of the present invention is to provide an injection molding mold and a molding method using the same, which can reduce the frequency of maintenance of the mold described above, and a molding method using the same at a low cost.
- the present invention was made as a result of intensive reexamination of the structure of injection molding molds in order to solve the above problems.
- An injection molding mold is an injection molding mold having a fixed side and a movable side, and the movable side is provided with a cavity in the vicinity of a position substantially opposite to a gate of the cavity.
- an overflow cavity consisting of an overflow cavity, and a groove having a width of 0.5 to 30.0 mm and a height of 0.3 to 3.0 mm, which communicates the cavity with the overflow cavity, and the groove is arranged.
- a cut pin for separating the molded product formed in the cavity from the overflow molded product filled in the groove and the overflow cavity is arranged at a position adjacent to the cavity, and A fixed side return pin for returning the cut pin to its original position is provided at a position facing the cut pin, and the fixed side return pin is provided with a recess on the opposite side of the cavity. do.
- a side surface of at least one of the cut pin and the fixed return pin on the side disposed in the cavity forms a part of the inner wall of the cavity. It is characterized by:
- the surface of the cavity on which the groove is arranged is provided with a step that constitutes a recess that is recessed from a connecting surface between the groove and the cavity. It is characterized by becoming.
- the molding method using the injection mold according to one aspect of the present invention is characterized in that the cut pin operates at a temperature at which the molten polymer material filled in the cavity does not solidify.
- an overflow cavity is arranged at a position substantially opposite to the gate of the cavity filled with the molten polymer material through a groove having a larger cross-sectional area than a normal gas vent. Therefore, the frequency of maintenance for cleaning the gas vent can be reduced compared to an injection mold with a normal gas vent.
- this groove has a larger cross-sectional area than a normal gas vent, it is filled with molten polymeric material and becomes part of the overflow molded product together with the molten polymeric material that fills the overflow cavity that communicates with the groove.
- the molded product is cut by the cut pin before it is solidified and ejected, so that the molded product is ejected separately from the molded product.
- the cut pin forms part of the side wall of the cavity and is cut before the molded product solidifies, it is possible to make cutting marks on the surface of the molded product so that they are not easily visible.
- the reason why the width of the groove is limited to 0.5 mm to 30.0 mm and the height to 0.3 mm to 3.0 mm is because the effect of providing the groove is limited if the width is less than 0.5 mm and the height is less than 0.3 mm. This is because if the width exceeds 30 mm and the height exceeds 3.0 mm, cutting with a cut pin becomes difficult.
- a fixed-side return pin which is provided with a recess on the opposite side of the cavity, is arranged at a position facing the cut pin.
- This fixed-side return pin has the function of returning the cut pin that protrudes to cut the groove to its original position, but because it is provided with a recess, only the groove part is cut off and the metal is removed. It can prevent it from adhering to the sliding parts of the mold. If such measures are not taken, there is a risk that when the mold is opened and the molded product is ejected, the material of the cut groove remains attached to the cut pin and the next mold clamping operation is performed, causing damage to the mold.
- FIG. 1 is an overall sectional view of an example of an injection mold according to the present invention.
- 2 is an enlarged view of a portion A surrounded by a broken line in FIG. 1.
- FIG. 3 is an enlarged view of a portion B surrounded by a broken line in FIG. 2.
- FIG. FIG. 2 is a perspective view showing a state in which the overflow molded product and the molded product are integrated, with no grooves cut, before being ejected. It is a figure which shows the example where the position where the groove
- FIG. 1 is an overall sectional view of an example of an injection mold according to the present invention.
- FIG. 2 is an enlarged view of the part A surrounded by the broken line in FIG. 1, and FIG.
- a state in which the molten polymer material is filled from the cavity 3 to the overflow cavity 6 via the groove 4 is shown.
- the cut pin 8 is moved upward in the figure.
- the molten polymer material filled in the groove 5 is separated from the molten polymer material filled in the cavity 3, that is, the molded product.
- a step 11 indicated by reference numeral 13 in FIG. it is necessary to design so that the surface of the fixed return pin 7 on the cavity 3 side constitutes a part of the inner wall of the cavity 3.
- FIG. 3 is an enlarged view of the portion B surrounded by the broken line in FIG. 2, showing a state in which the end of the groove 4 is separated from the molded product by the cut portion 12.
- FIG. 4 is a perspective view showing a state in which the overflow molded product and the molded product are integrated, with the groove 14 not cut, before being ejected.
- the molded product is ejected to the outside of the cavity 3 by the ejector sleeve 9, and at the same time, the overflow molded product filled in the groove 4 and the overflow cavity 6 is ejected to the outside by the operation of the ejector pins 10a and 10b, and is fixed.
- the side return pin 7 is returned to its home position by a restraining spring (not shown).
- the right side surface of the cut pin 8 in the figure is in contact with a part of the lower part of the left side surface of the longitudinal outer periphery in the figure of the cavity 3; This is because it constitutes a part of the outer periphery of the cavity 3. Due to the synergistic effect of such a structure and the cutting of the grooves before the molded product solidifies, the cutting marks of the grooves on the molded product become difficult to visually recognize.
- FIG. 5 is a diagram showing an example in which the position of the groove 20 of the cavity 19 is different from that shown in FIG. 1.
- 17 is a runner
- 18 is a submarine gate
- 19 is a cavity
- 20 is a groove
- 21 is a recess
- 22 is an overflow cavity
- 23 is a fixed side return pin
- 24 is a cut pin
- 25, 26a, 26b are ejector pins. It is.
- the cut pin 24 forms part of the inner wall of the cavity 19.
- an injection mold and a molding method using the same enable frequent maintenance related to removing dirt from the gas vent of an injection mold, contributing to improved productivity.
- the present invention is not limited to the above-described embodiments, and includes various modifications and modifications that can be conceived by a person having ordinary knowledge in the field of the present invention without departing from the gist of the present invention. Even if there is a design change in the range, it is of course included in the present invention.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Provided at low cost are a mold for injection molding and a molding method using same that may reduce a frequency of maintenance of the mold related to dirt removal of a gas vent. An overflow cavity is provided in a position facing a gate side of a cavity, and the cavity and the overflow cavity are communicated with each other through a groove having a width of 0.5 - 30.0 mm and a height of 0.3 - 3.0 mm. A molded product with which the cavity is filled and an overflow molded product with which the groove and the overflow cavity are filled are cut at a cutting pin before being cooled and solidified. Since the cutting pin consists a part of an inner wall of the cavity, a cut mark on the molded product is less visually recognizable. In addition, since a fixing side return pin provided in a position facing the cutting pin is provided with a concave portion, it can be prevented that only the groove part is cut out and adheres to a sliding portion or the like of the mold, whereby an opening/closing operation of the mold is not hindered.
Description
本発明は、射出成形用の金型に関し、特にガスベントの清掃に係る、メンテナンスの頻度を低減し得る、射出成形用の金型と、その金型を用いた成形方法に関するものである。
The present invention relates to an injection mold, and particularly to an injection mold that can reduce the frequency of maintenance related to gas vent cleaning, and a molding method using the mold.
射出成形は、加熱により溶融した、熱可塑性高分子材料を、金型に彫り込まれたキャビティと称される中空部に高圧で充填し、冷却固化して成形品を得るもので、高い生産性を有し、広汎に行われている。また一部では、熱硬化性の高分子材料の成形にも用いられている。
Injection molding is a process in which a thermoplastic polymer material melted by heating is filled under high pressure into a hollow part called a cavity carved into a mold, and then cooled and solidified to obtain a molded product, resulting in high productivity. and is widely practiced. In some cases, it is also used to mold thermosetting polymer materials.
射出成形においては、溶融高分子材料をキャビティ内に充填する際に、キャビティ内の空気や、高分子材料の加熱により発生するガスを、速やかに外部に排出する必要がある。このため、金型の固定側と可動側が接するパーティング面に、深さが数μｍで、キャビティと外部を連通する、ガスベントと称する溝を設けるのが必須となっている。
In injection molding, when filling a cavity with a molten polymer material, it is necessary to quickly exhaust the air inside the cavity and the gas generated by heating the polymer material to the outside. For this reason, it is essential to provide a groove called a gas vent, which has a depth of several micrometers and communicates the cavity with the outside, on the parting surface where the fixed side and the movable side of the mold contact.
しかし、成形を継続していると、前記の溶融高分子材料に由来するガスが、凝縮、凝固して、ガスベントに付着し、甚だしい場合は、ガスベントが詰まり、ガスベントとしての機能を妨げるので、適宜清掃する必要があり、生産性低下の一因となっている。
However, if molding continues, the gas originating from the molten polymer material will condense, solidify, and adhere to the gas vent, and in severe cases, the gas vent will become clogged and prevent its function as a gas vent. It requires cleaning, which is a cause of decreased productivity.
このような課題への解決策として、特許文献１には、キャビティとガスベントとを備える金型を用いて、８０℃以上の金型温度Ｔ℃で熱可塑性樹脂組成物を射出成形することを含む、成形品の製造方法であって、該射出成形時に、該ガスベント部にて捕集されるガスの総量をｃ；該ガスベント部にて捕集されるガスのうち、（Ｔ＋２０）℃未満の沸点を有するガスの量をａ；該ガスベント部にて捕集されるガスのうち、（Ｔ－２０）℃以上の沸点を有するガスの量をｂ；（ここで、ａ、ｂおよびｃの単位は、μｇ／熱可塑性樹脂組成物１ｇである。）としたときに、特定の計算式にて表されるガス焼け発生リスクｄの値を、３５以下にすることを特徴とする、製造方法が開示されている。
As a solution to such problems, Patent Document 1 includes injection molding of a thermoplastic resin composition at a mold temperature T° C. of 80° C. or higher using a mold provided with a cavity and a gas vent. , a method for manufacturing a molded article, wherein the total amount of gas collected in the gas vent part during the injection molding is c; of the gas collected in the gas vent part, the boiling point is less than (T + 20) ° C. A is the amount of gas having a boiling point of (T-20)°C or higher among the gases collected at the gas vent part; , μg/1 g of thermoplastic resin composition), a manufacturing method is disclosed, characterized in that the value of gas burn occurrence risk d expressed by a specific calculation formula is 35 or less. has been done.
しかし、ここに開示されている方法では、真空ポンプなどの機材や、取り回しのための部品が必要であり、金型の構造の複雑化や、それに伴うコスト増に繋がるという問題がある。
However, the method disclosed herein requires equipment such as a vacuum pump and parts for handling, which leads to a complicated mold structure and an associated cost increase.
そこで、本発明の課題は、前述の金型のメンテナンスの頻度を低減し得る、射出成形用金型とそれを用いた成形方法を、抵コストで提供することにある。
Therefore, an object of the present invention is to provide an injection molding mold and a molding method using the same, which can reduce the frequency of maintenance of the mold described above, and a molding method using the same at a low cost.
本発明は、前記課題の解決のため、射出成形用金型の構造を、鋭意再検討した結果、なされたものである。
The present invention was made as a result of intensive reexamination of the structure of injection molding molds in order to solve the above problems.
本発明の一態様に係る射出成形用金型は、固定側と可動側を有する射出成型用金型において、前記可動側に、キャビティと、前記キャビティのゲートと略対向する位置の近傍に設けられてなるオーバーフローキャビティと、前記キャビティと前記オーバーフローキャビティを連通させる、幅が０．５～３０．０ｍｍで、高さが０．３～３．０ｍｍの溝が設けられ、前記溝が配されてなる位置の前記キャビティに隣接する位置に、前記キャビティ内に形成される成形品と、前記溝と前記オーバーフローキャビティに充填されるオーバーフロー成形品を分離するためのカットピンが配され、前記固定側の前記カットピンに対向する位置に、前記カットピンを元の位置に戻すための固定側戻りピンが設けられ、前記固定側戻りピンには前記キャビティの反対側に凹部が設けられてなることを特徴とする。
An injection molding mold according to one aspect of the present invention is an injection molding mold having a fixed side and a movable side, and the movable side is provided with a cavity in the vicinity of a position substantially opposite to a gate of the cavity. an overflow cavity consisting of an overflow cavity, and a groove having a width of 0.5 to 30.0 mm and a height of 0.3 to 3.0 mm, which communicates the cavity with the overflow cavity, and the groove is arranged. A cut pin for separating the molded product formed in the cavity from the overflow molded product filled in the groove and the overflow cavity is arranged at a position adjacent to the cavity, and A fixed side return pin for returning the cut pin to its original position is provided at a position facing the cut pin, and the fixed side return pin is provided with a recess on the opposite side of the cavity. do.
また、本発明の一態様に係る射出成形用金型は、前記カットピンまたは前記固定側戻りピン少なくともいずれかの、前記キャビティに配された側の側面が、前記キャビティの内壁の一部を形成してなることを特徴とする。
Furthermore, in the injection molding mold according to one aspect of the present invention, a side surface of at least one of the cut pin and the fixed return pin on the side disposed in the cavity forms a part of the inner wall of the cavity. It is characterized by:
また、本発明の一態様に係る射出成形用金型は、前記キャビティの前記溝が配された面には、前記溝と前記キャビティの接続面よりも凹んだ凹部を構成する段差が設けられてなることを特徴とする。
Further, in the injection molding die according to one aspect of the present invention, the surface of the cavity on which the groove is arranged is provided with a step that constitutes a recess that is recessed from a connecting surface between the groove and the cavity. It is characterized by becoming.
また、本発明の一態様に係る射出成形用金型を用いた成形方法は、前記カットピンが、前記キャビティに充填された溶融高分子材料が固化しない温度で作動することを特徴とする。
Furthermore, the molding method using the injection mold according to one aspect of the present invention is characterized in that the cut pin operates at a temperature at which the molten polymer material filled in the cavity does not solidify.
本発明に係る射出成形用金型においては、溶融高分子材料が充填されるキャビティの、ゲートと略対向する位置に、通常のガスベントよりも断面積が大きい溝を介して、オーバーフローキャビティが、配されているので、通常のガスベントを有する射出成形用金型に比較すると、ガスベントの清掃のためのメンテナンスの頻度を低減することができる。
In the injection mold according to the present invention, an overflow cavity is arranged at a position substantially opposite to the gate of the cavity filled with the molten polymer material through a groove having a larger cross-sectional area than a normal gas vent. Therefore, the frequency of maintenance for cleaning the gas vent can be reduced compared to an injection mold with a normal gas vent.
また、この溝は、通常のガスベントよりも断面積が大きいので、溶融高分子材料が充填され、溝に連通するオーバーフローキャビティに充填される溶融高分子材料とともに、オーバーフロー成形品の一部となるが、本発明に係る射出成形用金型では、成形品が固化してエジェクトされる前に、カットピンにより切断されるので、成形品とは別個にエジェクトされる。
Additionally, since this groove has a larger cross-sectional area than a normal gas vent, it is filled with molten polymeric material and becomes part of the overflow molded product together with the molten polymeric material that fills the overflow cavity that communicates with the groove. In the injection mold according to the present invention, the molded product is cut by the cut pin before it is solidified and ejected, so that the molded product is ejected separately from the molded product.
しかも、カットピンはキャビティの側壁の一部を構成する構造であり、成形品が固化する前に切断するので、成形品の表面の切断痕は、容易に視認できない程度とすることが可能である。なお、溝の幅を０．５ｍｍ～３０．０ｍｍ、高さを０．３ｍｍ～３．０ｍｍと限定したのは、幅が０．５ｍｍ未満、高さ０．３ｍｍ未満では、溝を設ける効果が不十分となり、幅が３０ｍｍを超え、高さが３．０ｍｍを超えると、カットピンによる切断が困難となるからである。
Moreover, since the cut pin forms part of the side wall of the cavity and is cut before the molded product solidifies, it is possible to make cutting marks on the surface of the molded product so that they are not easily visible. . The reason why the width of the groove is limited to 0.5 mm to 30.0 mm and the height to 0.3 mm to 3.0 mm is because the effect of providing the groove is limited if the width is less than 0.5 mm and the height is less than 0.3 mm. This is because if the width exceeds 30 mm and the height exceeds 3.0 mm, cutting with a cut pin becomes difficult.
また、カットピンと対向する位置には、キャビティの反対側に凹部が設けられた、固定側戻りピンが配されている。この固定側戻りピンは、溝を切断するために突き出したカットピンを元の位置に戻す機能が付与されているが、凹部が設けられているために、溝の部分だけが切り離されて、金型の摺動部などに付着するのを防止できる。このような対策を施さない場合、型開き成形品エジェクトの際に、切り離された溝部の材料がカットピンに付着したまま、次の型締め動作を行い、金型を破損する危険が生じる。
Furthermore, a fixed-side return pin, which is provided with a recess on the opposite side of the cavity, is arranged at a position facing the cut pin. This fixed-side return pin has the function of returning the cut pin that protrudes to cut the groove to its original position, but because it is provided with a recess, only the groove part is cut off and the metal is removed. It can prevent it from adhering to the sliding parts of the mold. If such measures are not taken, there is a risk that when the mold is opened and the molded product is ejected, the material of the cut groove remains attached to the cut pin and the next mold clamping operation is performed, causing damage to the mold.
次に、具体的な図を参照しながら、本発明に係る射出成形用金型と、その金型を用いた成形方法の実施の形態について説明する。
Next, embodiments of an injection mold according to the present invention and a molding method using the mold will be described with reference to specific drawings.
図１は、本発明に係る射出成型金型の一例の全体の断面図である。また、図２は、図１における破線で囲んだ部分Ａの拡大図であり、図１（ａ）は、ランナー１からサブマリンゲート２を経由して、キャビティ３に溶融高分子材料が充填され、さらに、キャビティ３から溝４を経由して、オーバーフローキャビティ６まで溶融高分子材料が充填された状態を示す。
FIG. 1 is an overall sectional view of an example of an injection mold according to the present invention. Moreover, FIG. 2 is an enlarged view of the part A surrounded by the broken line in FIG. 1, and FIG. Furthermore, a state in which the molten polymer material is filled from the cavity 3 to the overflow cavity 6 via the groove 4 is shown.
本発明に係る射出成形の工程においては、図１（ｂ）に示したように、溶融高分子材料が充填された直後の十分冷却固化する前に、カットピン８が、図における上の方向に作動し、溝５に充填された溶融高分子材料と、キャビティ３に充填された溶融高分子材料、つまり成形品が分離される。また、ここに示した例では、キャビティ３の固定側戻りピン７が配された側には、図４に符号１３で示した段差１１が形成されているので、固定側戻りピン７とキャビティ３の側面が接することはないが、段差１１がない場合は、固定側戻りピン７のキャビティ３側の面が、キャビティ３の内壁の一部を構成するように設計する必要がある。
In the injection molding process according to the present invention, as shown in FIG. 1(b), immediately after the molten polymer material is filled and before it is sufficiently cooled and solidified, the cut pin 8 is moved upward in the figure. The molten polymer material filled in the groove 5 is separated from the molten polymer material filled in the cavity 3, that is, the molded product. In addition, in the example shown here, a step 11 indicated by reference numeral 13 in FIG. However, if there is no step 11, it is necessary to design so that the surface of the fixed return pin 7 on the cavity 3 side constitutes a part of the inner wall of the cavity 3.
図３は、図２における破線で囲まれた部分Ｂの拡大図で、溝４の端部がカット部１２で、成形品と分離されている状態を示す。また、図４は、エジェクトされる前の、溝１４がカットされていない状態の、オーバーフロー成形品と成形品が一体化した状態を示す斜視図である。オーバーフロー成形品１５を、原料のプラスチックのペレットと同程度の大きさとすることで、そのままリサイクル材として使用できる。
FIG. 3 is an enlarged view of the portion B surrounded by the broken line in FIG. 2, showing a state in which the end of the groove 4 is separated from the molded product by the cut portion 12. Moreover, FIG. 4 is a perspective view showing a state in which the overflow molded product and the molded product are integrated, with the groove 14 not cut, before being ejected. By making the overflow molded product 15 approximately the same size as the raw material plastic pellets, it can be used as a recycled material as is.
その後、エジェクタースリーブ９により、成形品がキャビティの３の外部に突き出され、同時に、溝部４とオーバーフローキャビティ６に充填されたオーバーフロー成形品が、エジェクターピン１０ａ、１０ｂの作動により外部に突き出され、固定側戻りピン７が、図示していない抑えバネにより定位置に戻る。
Thereafter, the molded product is ejected to the outside of the cavity 3 by the ejector sleeve 9, and at the same time, the overflow molded product filled in the groove 4 and the overflow cavity 6 is ejected to the outside by the operation of the ejector pins 10a and 10b, and is fixed. The side return pin 7 is returned to its home position by a restraining spring (not shown).
図１において、カットピン８の図における右側の面は、キャビティ３の図における縦方向の外周の左側の面の下方の一部と接しているが、これはカットピン８の図における右側の面が、キャビティ３の外周の一部を構成しているためである。このような構造と、成形体が固化する前に、溝を切断することによる相乗効果で、成形品の溝の切断痕は、目視では視認が困難な程度になる。
In FIG. 1, the right side surface of the cut pin 8 in the figure is in contact with a part of the lower part of the left side surface of the longitudinal outer periphery in the figure of the cavity 3; This is because it constitutes a part of the outer periphery of the cavity 3. Due to the synergistic effect of such a structure and the cutting of the grooves before the molded product solidifies, the cutting marks of the grooves on the molded product become difficult to visually recognize.
また図２に示したように、固定側戻りピンのカットピン８と対向する側には、凹部５が設けられているため、溝４に充填された材料のみが分離することなく、オーバーフローキャビティの部分と一体に突き出されるので、次の型締め動作の際の、金型の破損を未然に防止することができる。
Furthermore, as shown in FIG. 2, since a recess 5 is provided on the side of the fixed side return pin facing the cut pin 8, only the material filled in the groove 4 is not separated, and the overflow cavity is filled. Since it is protruded integrally with the part, it is possible to prevent damage to the mold during the next mold clamping operation.
図５は、キャビティ１９の溝２０が配される位置が、図１に示したとは例とは異なる例を示す図である。図５において、１７はランナー、１８はサブマリンゲート、１９はキャビティ、２０は溝、２１は凹部、２２はオーバーフローキャビティ、２３は固定側戻りピン、２４はカットピン、２５，２６ａ，２６ｂはエジェクターピンである。この場合は、カットピン２４が、キャビティ１９の内壁の一部を構成する構造となる。
FIG. 5 is a diagram showing an example in which the position of the groove 20 of the cavity 19 is different from that shown in FIG. 1. In FIG. 5, 17 is a runner, 18 is a submarine gate, 19 is a cavity, 20 is a groove, 21 is a recess, 22 is an overflow cavity, 23 is a fixed side return pin, 24 is a cut pin, and 25, 26a, 26b are ejector pins. It is. In this case, the cut pin 24 forms part of the inner wall of the cavity 19.
以上に説明したように、本発明によれば、射出成形金型のガスベントの汚れの除去に関わるメンテナンスの頻度が可能となり、生産性向上に寄与する射出成形用金型とそれを用いた成形方法を提供できる。なお、本発明は、前記実施の形態に限定されるものではなく、本発明の分野における通常の知識を有する者であれば想到し得る、各種変形、修正を含む、本発明の要旨を逸脱しない範囲の設計変更があっても、本発明に含まれることは勿論である。
As explained above, according to the present invention, an injection mold and a molding method using the same enable frequent maintenance related to removing dirt from the gas vent of an injection mold, contributing to improved productivity. can be provided. It should be noted that the present invention is not limited to the above-described embodiments, and includes various modifications and modifications that can be conceived by a person having ordinary knowledge in the field of the present invention without departing from the gist of the present invention. Even if there is a design change in the range, it is of course included in the present invention.
１，１７・・・ランナー
２，１８・・・サブマリンゲート
３，１９・・・キャビティ
４，１４，２０・・・溝
５，２１・・・凹部
６，１５，２２・・・オーバーフローキャビティ
７，２３・・・固定側戻りピン
８，２４・・・カットピン
９，１０ａ，１０ｂ，２５，２６ａ，２６ｂ・・・エジェクターピン
１１，１３・・・段差部
１２・・・カット部
２７・・・パーティング面
1, 17... Runner 2, 18... Submarine gate 3, 19... Cavity 4, 14, 20... Groove 5, 21... Recess 6, 15, 22... Overflow cavity 7, 23... Fixed side return pins 8, 24... Cut pins 9, 10a, 10b, 25, 26a, 26b... Ejector pins 11, 13... Step portion 12... Cut portion 27... Parting surface
２，１８・・・サブマリンゲート
３，１９・・・キャビティ
４，１４，２０・・・溝
５，２１・・・凹部
６，１５，２２・・・オーバーフローキャビティ
７，２３・・・固定側戻りピン
８，２４・・・カットピン
９，１０ａ，１０ｂ，２５，２６ａ，２６ｂ・・・エジェクターピン
１１，１３・・・段差部
１２・・・カット部
２７・・・パーティング面
1, 17... Runner 2, 18... Submarine gate 3, 19... Cavity 4, 14, 20... Groove 5, 21... Recess 6, 15, 22... Overflow cavity 7, 23... Fixed side return pins 8, 24... Cut pins 9, 10a, 10b, 25, 26a, 26b... Ejector pins 11, 13... Step portion 12... Cut portion 27... Parting surface
Claims (4)
- 固定側と可動側を有する射出成型用金型において、前記可動側に、キャビティと、前記キャビティのゲートと対向する位置に設けられてなるオーバーフローキャビティと、前記キャビティと前記オーバーフローキャビティを連通させる、幅が０．５～３０．０ｍｍで、高さが０．３～３．０ｍｍの溝が設けられ、前記溝が配されてなる位置の前記キャビティに隣接する位置に、前記キャビティ内に形成される成形品と、前記溝と前記オーバーフローキャビティに充填されるオーバーフロー成形品を分離するためのカットピンが配され、前記固定側の前記カットピンに対向する位置に、前記カットピンを元の位置に戻すための固定側戻りピンが設けられ、前記固定側戻りピンには前記キャビティの反対側に凹部が設けられてなることを特徴とする、射出成形用金型。 In an injection molding mold having a fixed side and a movable side, the movable side includes a cavity, an overflow cavity provided at a position facing a gate of the cavity, and a width that allows the cavity and the overflow cavity to communicate with each other. a groove with a height of 0.5 to 30.0 mm and a height of 0.3 to 3.0 mm, and is formed within the cavity at a position adjacent to the cavity where the groove is arranged. A cut pin is arranged to separate the molded product from the overflow molded product filled in the groove and the overflow cavity, and the cut pin is returned to its original position opposite to the cut pin on the fixed side. A mold for injection molding, characterized in that a fixed side return pin is provided for the purpose of the injection molding, and the fixed side return pin is provided with a recessed portion on the opposite side of the cavity.
- 前記カットピンまたは前記固定側戻りピン少なくともいずれかの、前記キャビティに配された側の側面は、前記キャビティの内壁の一部を形成してなることを特徴とする、請求項１に記載の射出成形用金型。 The injection method according to claim 1, wherein a side surface of at least one of the cut pin and the fixed return pin on the side disposed in the cavity forms a part of the inner wall of the cavity. Molding mold.
- 前記キャビティの前記溝が配された面には、前記溝と前記キャビティの接続面よりも凹んだ凹部を構成する段差が設けられてなることを特徴とする、請求項１に記載の射出成形用金型。 2. The method for injection molding according to claim 1, wherein the surface of the cavity on which the groove is arranged is provided with a step forming a concave portion that is deeper than a connecting surface between the groove and the cavity. Mold.
- 前記カットピンは、前記キャビティに充填された溶融高分子材料が固化しない温度で作動することを特徴とする、請求項１ないし請求項３のいずれかに記載の射出成形用金型を用いた、前記成形品の成形方法。
Using the injection mold according to any one of claims 1 to 3, wherein the cut pin operates at a temperature at which the molten polymer material filled in the cavity does not solidify. A method for molding the molded product.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022-124380 | 2022-07-15 | ||
| JP2022124380A JP7217849B1 (en) | 2022-07-15 | 2022-07-15 | Injection mold and molding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024014142A1 true WO2024014142A1 (en) | 2024-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2023/019531 WO2024014142A1 (en) | 2022-07-15 | 2023-05-25 | Mold for injection molding and molding method |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7217849B1 (en) |
| WO (1) | WO2024014142A1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010201666A (en) * | 2009-03-02 | 2010-09-16 | Gifu Tada Seiki:Kk | Injection molding die, and injection molding method |
| JP2020029045A (en) * | 2018-08-23 | 2020-02-27 | アピックヤマダ株式会社 | Mold and resin molding apparatus provided with the same |
-
2022
- 2022-07-15 JP JP2022124380A patent/JP7217849B1/en active Active
-
2023
- 2023-05-25 WO PCT/JP2023/019531 patent/WO2024014142A1/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010201666A (en) * | 2009-03-02 | 2010-09-16 | Gifu Tada Seiki:Kk | Injection molding die, and injection molding method |
| JP2020029045A (en) * | 2018-08-23 | 2020-02-27 | アピックヤマダ株式会社 | Mold and resin molding apparatus provided with the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2024012009A (en) | 2024-01-25 |
| JP7217849B1 (en) | 2023-02-06 |
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