JPH0482092B2 - - Google Patents
Info
- Publication number
- JPH0482092B2 JPH0482092B2 JP62163608A JP16360887A JPH0482092B2 JP H0482092 B2 JPH0482092 B2 JP H0482092B2 JP 62163608 A JP62163608 A JP 62163608A JP 16360887 A JP16360887 A JP 16360887A JP H0482092 B2 JPH0482092 B2 JP H0482092B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- mold
- tip
- temperature
- ceramic
- 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 - Lifetime
Links
- 239000000919 ceramic Substances 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000001746 injection moulding Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000000057 synthetic resin Substances 0.000 description 14
- 229920003002 synthetic resin Polymers 0.000 description 14
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 229910002077 partially stabilized zirconia Inorganic materials 0.000 description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 229920001187 thermosetting polymer 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
- B29C45/20—Injection nozzles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
（産業上の利用分野）
本発明は、射出成形機のノズル構造に関する。
（従来の技術）
合成樹脂の射出成形は金型で画成したキヤビテ
イ内に溶融合成樹脂を流入するのであるが、その
方法は射出装置のノズルから金型に設けたスプル
プツシユを通して充填する。
（発明が解決しようとする問題点）
しかしながら、射出装置のノズルを金型に当接
したノズルタツチのままで合成樹脂を射出する
と、ノズル付近の温度は、金型の熱容量が大きい
ために金型の温度に影響をうけ、加熱した合成樹
脂の状態を変化させる場合がある。たとえば熱硬
化性樹脂のとき、金型の温度の方が高ければ硬化
が始まり、可塑性樹脂のとき、金型の温度の方が
低ければ冷却固化の現象があらわれる。
実際、多様の合成樹脂を射出成形するために、
設定溶融温度等の違いにより、金型の温度の影響
をうけ合成樹脂の流路に塊状の合成樹脂が発生し
て流動特性が悪くなることが多く見られる。そこ
でノズルを金型から離したりして、ノズルの反復
動を繰返しながら射出成形を行うと、合成樹脂の
糸引き、金型及びノズルのへたり等の問題が起
き、問題解決には至らなかつた。
本発明は、上記問題を解決するために、金型の
温度に影響されない射出成形機装置のノズル構造
を提供することを目的とする。
（問題点を解決するための手段）
本発明は、上記目的を達成するために、材料を
溶融し射出するための加熱筒の先端部に、中心に
小孔を穿設し先端を略球面状にした略円錐状のテ
ーパ面を有するセラミツクノズルを、該セラミツ
クノズルのテーパ面と当接し前記セラミツクノズ
ルの先端を露出する環状の締付金具によつて取付
けたことを特徴とする。
（作用）
本考案は、上記のように構成するものであるか
ら、セラミツクノズルを先端部に当接させ、締付
金具をセラミツクノズルに被せて加熱筒に螺着す
るとき、セラミツクノズルの形状が略円錐形なの
で挿入締付けが容易となる。そして、略円錐状テ
ーパ面は締付金具の内周面と当接し、先端は締付
金具から突出する。これによつて、金型に加熱筒
を接合するときはセラミツクノズルが介在し、そ
のときのセラミツクノズルへの衝撃は締付金具に
よつて保護される。また、射出時には、高圧の樹
脂圧がセラミツクノズルの内周面にかかるがテー
パ面によつて締付金具に樹脂圧がかかるようにな
つている。金型の温度は使用状態により変化して
おり、また合成樹脂の溶融温度はノズルを取付け
た加熱筒により所定の温度を保つている。ノズル
先端部が金型に当接したときには、金型の温度は
セラミツクスを通してノズル内部および後方へ伝
わるが、セラミツクスの熱伝導率が非常に小さい
ため、ノズル内部および後方へはほとんど影響さ
れない。従つて、加熱された溶融合成樹脂は金型
に射出されるまでその温度を維持している。
（実施例）
本発明の実施例を第１図に基づいて説明する。
図において１は加熱筒の先端部であり、溶融さ
れた材料の通る流通孔１ａが形成され、流通孔１
ａの端部に内周面にねじ溝を形成した拡径部１ｂ
が設けられている。拡径部１ｂの内部にはその基
部に当接してセラミツクス製の略円錐状のノズル
２を配置するようになつている。このノズル２の
先端は略球面状を呈し、外周は略円錐形状のテー
パ面２ａを有している。そして、ノズル２を固定
する締付金具３は環状に形成されており、内周面
はテーパ面２ａと当接するようにテーパ状にさ
れ、外周にはねじ溝と六角頭とを有している。
したがつて、配置したノズル２に締付金具３を
通し、先端部１の拡径部１ｂに締付金具３を螺着
することによつてノズル２が軸心に整合して固着
される。締付け後は、ノズルタツチの部分だけが
露出し他は締付金具３により保護される。このた
め、加熱筒が金型に接合するときの衝撃力による
ノズル２への影響は緩和され、また、射出時に
は、高圧の樹脂圧がノズル２の内周面にかかつて
も締付金具３により、ノズル２の破裂を防止して
いる。また、締付金具３は拡径部１ｂ内に螺着さ
れているので内側からの圧力に強固にされてい
る。軸方向から見た場合には第２図のように中心
にノズル２が位置し、
ノズル２先端が金型（図示せず）に当接する。
このノズル２のセラミツクスとしてはジルコニ
ア（ZrO）を主成分とした部分安定化ジルコニア
（PSZ）が望ましい。部分安定化ジルコニアの特
長は熱伝導率が小さく、他のセラミツクスと比較
して高強度、高靭性に勝れ、熱膨張率が鉄に近い
ことである。熱衝撃温度からは窒化珪素が好適で
あるが、剛材と組合わせて使用する場合には部分
安定化ジルコニアの方がよい。部分安定化ジルコ
ニアの特長を数値で示す。
(Industrial Application Field) The present invention relates to a nozzle structure for an injection molding machine. (Prior Art) In injection molding of synthetic resin, molten synthetic resin is poured into a cavity defined by a mold, and the method is to fill the resin from a nozzle of an injection device through a spur push provided in the mold. (Problem to be solved by the invention) However, if synthetic resin is injected with the nozzle of the injection device in contact with the mold, the temperature near the nozzle will be lower than that of the mold due to the large heat capacity of the mold. It is affected by temperature and may change the state of heated synthetic resin. For example, in the case of a thermosetting resin, if the temperature of the mold is higher, curing will begin; in the case of a plastic resin, if the temperature of the mold is lower, the phenomenon of cooling and solidification will occur. In fact, in order to injection mold various synthetic resins,
Due to differences in set melting temperatures, etc., lumps of synthetic resin are often generated in the flow path of the synthetic resin due to the influence of the temperature of the mold, resulting in poor flow characteristics. Therefore, if the nozzle was removed from the mold and injection molding was performed while the nozzle was repeatedly moved, problems such as stringing of the synthetic resin and settling of the mold and nozzle occurred, and the problem could not be solved. . In order to solve the above problems, the present invention aims to provide a nozzle structure for an injection molding machine that is not affected by the temperature of the mold. (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a heating tube for melting and injecting material, with a small hole in the center at the tip and a substantially spherical tip. The present invention is characterized in that a ceramic nozzle having a substantially conical tapered surface is attached by an annular fastening fitting that contacts the tapered surface of the ceramic nozzle and exposes the tip of the ceramic nozzle. (Function) Since the present invention is constructed as described above, when the ceramic nozzle is brought into contact with the tip, the clamping fitting is placed over the ceramic nozzle, and is screwed onto the heating cylinder, the shape of the ceramic nozzle is changed. Since it is approximately conical, it is easy to insert and tighten. The substantially conical tapered surface contacts the inner circumferential surface of the fastening metal fitting, and the tip thereof protrudes from the fastening metal fitting. As a result, the ceramic nozzle is interposed when the heating cylinder is joined to the mold, and the impact to the ceramic nozzle at that time is protected by the clamping fitting. Further, during injection, high resin pressure is applied to the inner peripheral surface of the ceramic nozzle, and the tapered surface allows the resin pressure to be applied to the fastening fitting. The temperature of the mold changes depending on the usage conditions, and the melting temperature of the synthetic resin is maintained at a predetermined temperature by a heating tube with a nozzle attached. When the nozzle tip comes into contact with the mold, the temperature of the mold is transmitted to the inside and rear of the nozzle through the ceramics, but because the thermal conductivity of ceramics is extremely low, the inside and rear of the nozzle are hardly affected. Therefore, the heated molten synthetic resin maintains its temperature until it is injected into the mold. (Example) An example of the present invention will be described based on FIG. 1. In the figure, reference numeral 1 indicates the tip of the heating cylinder, in which a communication hole 1a through which the melted material passes is formed.
An enlarged diameter portion 1b having a threaded groove formed on the inner circumferential surface at the end of a.
is provided. A substantially conical nozzle 2 made of ceramic is disposed inside the enlarged diameter portion 1b in contact with its base. The tip of this nozzle 2 has a substantially spherical shape, and the outer periphery has a tapered surface 2a having a substantially conical shape. The fastening fitting 3 for fixing the nozzle 2 is formed into an annular shape, the inner peripheral surface is tapered so as to come into contact with the tapered surface 2a, and the outer periphery has a thread groove and a hexagonal head. . Therefore, by passing the fastening fitting 3 through the arranged nozzle 2 and screwing the fastening fitting 3 onto the enlarged diameter portion 1b of the distal end portion 1, the nozzle 2 is fixed in alignment with the axis. After tightening, only the nozzle touch part is exposed and the rest is protected by the tightening metal fitting 3. Therefore, the influence of impact force on the nozzle 2 when the heating tube is joined to the mold is alleviated, and even when high resin pressure is applied to the inner circumferential surface of the nozzle 2 during injection, the clamping fitting 3 , which prevents the nozzle 2 from bursting. Further, since the fastening fitting 3 is screwed into the enlarged diameter portion 1b, it is made strong against pressure from inside. When viewed from the axial direction, the nozzle 2 is located at the center as shown in FIG. 2, and the tip of the nozzle 2 comes into contact with a mold (not shown). As the ceramic of this nozzle 2, partially stabilized zirconia (PSZ) containing zirconia (ZrO) as a main component is preferable. Partially stabilized zirconia has a low thermal conductivity, superior strength and toughness compared to other ceramics, and a coefficient of thermal expansion close to that of iron. Silicon nitride is preferred in terms of thermal shock temperature, but partially stabilized zirconia is better when used in combination with rigid materials. The features of partially stabilized zirconia are shown numerically.
【表】
以上のように構成した射出装置において、溶融
合成樹脂は加熱筒により設定温度に熱せられ、射
出時にノズルから金型へ吐出する。このとき、金
型の温度はノズルにより遮断され、温度の影響を
受ける溶融合成樹脂には熱が伝わらず形態を維持
することができる。たとえば当社製M32−TSで
は樹脂圧1650Kg／cm2でノズルを金型（温度180℃）
にタツチしたまま成形を行つているが合成樹脂流
路の流れは順調である。また、耐摩耗性もよく、
ノズル寿命も向上する。
（発明の効果）
本発明は、以上のように構成したものであるか
ら、ノズルの略円錐形状により締付金具の取付け
が容易であり、テーパ面で締付けるので密着性が
良いものである。また、ノズルが締付金具からそ
のタツチ面のみ突出させているのでノズルタツチ
の衝撃は緩和され、射出時、樹脂圧によりノズル
に内圧がかかつたときは締付金具がノズルの外周
面と密接しているので、ノズルの破裂を防止する
ことができる。
また、締付金具は加熱筒の温度をノズルの先部
まで誘導するので、溶融した材料の状態を維持す
るようにしており、また、ノズルをセラミツクス
で構成しているので、ノズルを金型に当接したま
までも、合成樹脂の流動特性は悪化せず連続使用
が可能になつた。また、部分安定化ジルコニア等
のセラミツクスを使用したことにより耐摩耗性が
よくノズルの寿命も延びる等の効果がある。[Table] In the injection device configured as described above, the molten synthetic resin is heated to a set temperature by the heating cylinder, and is discharged from the nozzle into the mold during injection. At this time, the temperature of the mold is blocked by the nozzle, and the molten synthetic resin, which is affected by temperature, is not transferred to the molten plastic and can maintain its shape. For example, with our company's M32-TS, the nozzle is molded at a resin pressure of 1650 kg/cm 2 (temperature 180°C).
Although molding is performed with the pressure on the resin, the flow in the synthetic resin flow path is smooth. It also has good wear resistance,
Nozzle life is also improved. (Effects of the Invention) Since the present invention is constructed as described above, the substantially conical shape of the nozzle makes it easy to attach the fastening fitting, and the tapered surface provides good adhesion. In addition, since only the touch surface of the nozzle protrudes from the tightening fitting, the impact on the nozzle touch is alleviated, and when internal pressure is applied to the nozzle due to resin pressure during injection, the tightening fitting comes into close contact with the outer peripheral surface of the nozzle. This prevents the nozzle from bursting. In addition, since the fastener guides the temperature of the heating tube to the tip of the nozzle, it maintains the molten state of the material.Also, since the nozzle is made of ceramics, the nozzle can be attached to the mold. Even if they remain in contact with each other, the flow characteristics of the synthetic resin do not deteriorate and continuous use is now possible. Furthermore, the use of ceramics such as partially stabilized zirconia provides good wear resistance and extends the life of the nozzle.
第１図は本発明の実施例の説明断面図、第２図
は第１図の平面図である。
２……ノズル（部分安定化ジルコニア）、２ａ
……テーパ面。
FIG. 1 is an explanatory sectional view of an embodiment of the present invention, and FIG. 2 is a plan view of FIG. 1. 2... Nozzle (partially stabilized zirconia), 2a
...Tapered surface.
Claims (1)
に、中心に小孔を穿設し先端を略球面状にした略
円錐状のテーパ面を有するセラミツクノズルを、
該セラミツクノズルのテーパ面と当接し前記セラ
ミツクノズルの先端を露出する環状の締付金具に
よつて取付けたことを特徴とする射出成形機のノ
ズル構造。1. At the tip of the heating cylinder for melting and injecting the material, a ceramic nozzle with a substantially conical tapered surface with a small hole in the center and a substantially spherical tip is installed.
1. A nozzle structure for an injection molding machine, characterized in that the nozzle structure is attached to the ceramic nozzle by an annular fastening fitting that contacts the tapered surface of the ceramic nozzle and exposes the tip of the ceramic nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16360887A JPS648012A (en) | 1987-06-30 | 1987-06-30 | Nozzle structure of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16360887A JPS648012A (en) | 1987-06-30 | 1987-06-30 | Nozzle structure of injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS648012A JPS648012A (en) | 1989-01-12 |
| JPH0482092B2 true JPH0482092B2 (en) | 1992-12-25 |
Family
ID=15777162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16360887A Granted JPS648012A (en) | 1987-06-30 | 1987-06-30 | Nozzle structure of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS648012A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02111510U (en) * | 1989-02-21 | 1990-09-06 | ||
| US5595704A (en) * | 1992-02-21 | 1997-01-21 | Sohzohkagaku Co., Ltd. | Method of using a shaping mold for making ultra-thin shaped rubber articles |
| JPH06246785A (en) * | 1993-02-26 | 1994-09-06 | Japan Steel Works Ltd:The | Nozzle of injection device |
| CA2363544C (en) * | 1993-06-30 | 2008-04-15 | Mold-Masters Limited | Two-piece injection molding nozzle seal |
| WO2014148268A1 (en) * | 2013-03-22 | 2014-09-25 | コニカミノルタ株式会社 | Injection molding method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62134234A (en) * | 1985-12-06 | 1987-06-17 | Miyagawa Kasei Kogyo Kk | Nozzle for injection molding |
| JPS63189215A (en) * | 1987-02-03 | 1988-08-04 | Tosoh Corp | Nozzle for plastic injection molder |
-
1987
- 1987-06-30 JP JP16360887A patent/JPS648012A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS648012A (en) | 1989-01-12 |
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