JP2017056655A - Injection molding machine - Google Patents

Injection molding machine Download PDF

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Publication number
JP2017056655A
JP2017056655A JP2015183814A JP2015183814A JP2017056655A JP 2017056655 A JP2017056655 A JP 2017056655A JP 2015183814 A JP2015183814 A JP 2015183814A JP 2015183814 A JP2015183814 A JP 2015183814A JP 2017056655 A JP2017056655 A JP 2017056655A
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screw head
screw
check ring
end surface
injection molding
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秀也 武信
Hideya Takenobu
秀也 武信
井上　誠
Makoto Inoue
誠 井上
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Toyo Machinery and Metal Co Ltd
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Toyo Machinery and Metal Co Ltd
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PROBLEM TO BE SOLVED: To suppress mutual sliding and abrasion of a rear end face of a tip part of a screw head and a top end face of a check ring.SOLUTION: Provided is an injection molding machine 1 that includes: a heating cylinder 3 for heating/fusing a resin material; a screw 5 provided rotatably in the heating cylinder; a screw head 6 mounted to a tip of the screw 5; and a check ring 10 loosely fitted to the screw head 6. The screw head 6 includes: a tip part 7; an axis part 9 to which the check ring 10 is loosely fitted to be capable of moving back and forth; and a screw part 8 that is fixed to the screw 5. A resin flow part 15 is provided between a rear end face 11 of the tip part 7 of the screw head 6 and a top end face 13 of the check ring 10.SELECTED DRAWING: Figure 3

Description

本発明は、金型のキャビティに射出される樹脂材料を可塑化・計量するときに回転されるスクリューを備えた射出成形機に関する。特に、樹脂材料の可塑化のためスクリューが回転されるとき、スクリューの先端側に設けられた摺動部品が摩耗することを抑制することが可能な射出成形機に関する。   The present invention relates to an injection molding machine including a screw that is rotated when plasticizing and measuring a resin material injected into a cavity of a mold. In particular, the present invention relates to an injection molding machine capable of suppressing wear of a sliding component provided on the tip side of a screw when the screw is rotated for plasticizing a resin material.

従来から用いられている一般的な射出成形機においては、加熱シリンダ内に原料である粒状の樹脂材料を送り、加熱シリンダ内に設けられたスクリューの回転により樹脂を溶融しながら加熱シリンダ先端の射出ノズル側に送り出して樹脂材料の計量を行った後、スクリューを前進させることにより、射出ノズルから型閉された金型のキャビティに所定量の樹脂材料の射出を行っている。   In a general injection molding machine that has been used in the past, a granular resin material as a raw material is fed into a heating cylinder, and the resin is melted by the rotation of a screw provided in the heating cylinder, and injection at the tip of the heating cylinder is performed. After feeding to the nozzle side and weighing the resin material, the screw is advanced to inject a predetermined amount of resin material from the injection nozzle into the mold cavity closed.

樹脂材料を計量するときに回転される、加熱シリンダ内に設けたスクリューには、その先端にスクリューヘッドを一体に設け、該スクリューヘッドの外周部には、筒状のチェックリングを遊嵌させたものが知られている。こうした技術に関連するものとして、例えば特許文献１には、スクリュ６の先端側にスクリュヘッド１を設け、該スクリュヘッド１に筒状の逆流防止リング３を遊嵌させたものが開示されている。   The screw provided in the heating cylinder, which is rotated when measuring the resin material, is integrally provided with a screw head at the tip, and a cylindrical check ring is loosely fitted on the outer periphery of the screw head. Things are known. For example, Patent Document 1 discloses a technique in which a screw head 1 is provided on the distal end side of a screw 6 and a cylindrical backflow prevention ring 3 is loosely fitted to the screw head 1. .

実開平３−６２８１３号公報Japanese Utility Model Publication No. 3-62813

特許文献１等の周知の射出成形機においては、逆流防止リング等のチェックリングとスクリューヘッドとの間に樹脂材料経路がある。スクリューの回転により樹脂材料の可塑化・計量工程が行われるときには、樹脂材料が樹脂材料経路を通り、スクリューの先端側に装着されたスクリューヘッド側へと供給されることになるのだが、可塑化工程が行われるときには、スクリューヘッド後端面とチェックリングの先端面とは、スクリューの回転に伴い互いに摺動されるため、こうした摺動部位に摩耗が発生するという問題があった。   In a known injection molding machine such as Patent Document 1, there is a resin material path between a check ring such as a backflow prevention ring and a screw head. When a plastic material is plasticized and weighed by the rotation of the screw, the resin material passes through the resin material path and is supplied to the screw head mounted on the tip of the screw. When the process is performed, the screw head rear end surface and the check ring front end surface slide with each other as the screw rotates, and there is a problem in that wear occurs at these sliding portions.

本発明は、上記課題に鑑みてなされたものであり、可塑化工程等によりスクリューが回転されるとき、スクリューヘッドの先端部の後端面とチェックリングの先端面とが互いに摺動して摩耗してしまうことを抑制することが可能な射出成形機を提供することを目的とする。   The present invention has been made in view of the above problems, and when the screw is rotated by a plasticizing process or the like, the rear end surface of the front end of the screw head and the front end surface of the check ring slide and wear. It is an object of the present invention to provide an injection molding machine that can suppress the occurrence of the above.

本射出成形機に係る発明は、
供給されてきた樹脂材料を加熱溶融する加熱シリンダと、加熱シリンダ内に回転可能に設けられたスクリューと、該スクリューの先端に装着されたスクリューヘッドと、該スクリューヘッドに遊嵌されたチェックリングと、を備えた射出成形機において、
前記スクリューヘッドには、先端部と、前記チェックリングが進退可能に遊嵌された軸部と、前記スクリューに固定される取付部と、を備えており、
前記スクリューの回転により、前記チェックリングと前記軸部との間の樹脂材料経路から供給されてきた加熱溶融された樹脂材料が、前記スクリューヘッドの前記先端部の後端面と前記チェックリングの先端面とが接触しない状態で前記スクリューヘッドの先端部側に供給されるよう、前記スクリューヘッドの前記先端部の前記後端面と前記チェックリングの前記先端面との間に樹脂流れ部を設けたことを特徴とする。 The invention related to this injection molding machine
A heating cylinder that heats and melts the supplied resin material, a screw that is rotatably provided in the heating cylinder, a screw head that is attached to the tip of the screw, and a check ring that is loosely fitted to the screw head In an injection molding machine equipped with
The screw head includes a tip portion, a shaft portion in which the check ring is loosely fitted so as to advance and retreat, and an attachment portion fixed to the screw.
Due to the rotation of the screw, the heated and melted resin material supplied from the resin material path between the check ring and the shaft portion is the rear end surface of the front end portion of the screw head and the front end surface of the check ring. A resin flow portion is provided between the rear end surface of the tip portion of the screw head and the front end surface of the check ring so that the screw head is supplied to the tip portion side of the screw head without contact with the screw head. Features.

本射出成形機に係る発明は、
前記チェックリングと前記軸部との間の前記樹脂材料経路に供給されてきた前記樹脂材料を、前記スクリューヘッドの先端部側に押し出す螺旋状のフライトを、前記スクリューヘッドの前記軸部の外周面に設けたことを特徴とする。 The invention related to this injection molding machine
A spiral flight that pushes the resin material that has been supplied to the resin material path between the check ring and the shaft portion toward the tip end side of the screw head, and an outer peripheral surface of the shaft portion of the screw head. It is characterized by being provided in.

本射出成形機に係る発明は、
前記チェックリングの前記先端面は円環な平面状を有し、これに臨む前記スクリューヘッドの前記先端部の前記後端面は円環な平面状を有することを特徴とする。 The invention related to this injection molding machine
The front end surface of the check ring has an annular planar shape, and the rear end surface of the distal end portion of the screw head facing the check ring has an annular planar shape.

本射出成形機に係る発明は、
前記スクリューヘッドの先端部の前記後端面は円滑な平面状を有し、これに臨む前記チェックリングの前記先端面には円周方向に断続的に凹部を複数有することを特徴とする。 The invention related to this injection molding machine
The rear end surface of the front end portion of the screw head has a smooth planar shape, and the front end surface of the check ring facing the front end surface has a plurality of recesses intermittently in the circumferential direction.

本発明によれば、スクリューの回転により、チェックリングとスクリューヘッドの軸部との間の樹脂材料経路からスクリューヘッドの先端部側へ加熱溶融された樹脂材料が供給されるとき、スクリューヘッドの先端部の後端面とチェックリングの先端面との間に樹脂流れ部を有することで、スクリューヘッドの先端部の後端面とチェックリングの先端面との接触を抑制することができる。よって、可塑化工程等のためスクリューが回転され、それに伴い、当該スクリューと共にスクリューヘッドが回転されるとき、スクリューヘッドの先端部の後端面とチェックリングの先端面とが互いに接触して摺動してしまい摩耗することを抑制することができる。   According to the present invention, when the resin material heated and melted is supplied from the resin material path between the check ring and the shaft portion of the screw head to the tip portion side of the screw head by the rotation of the screw, the tip of the screw head By having the resin flow part between the rear end surface of the part and the front end surface of the check ring, contact between the rear end surface of the front end part of the screw head and the front end surface of the check ring can be suppressed. Therefore, when the screw is rotated for the plasticizing process and the screw head is rotated together with the screw, the rear end surface of the front end portion of the screw head and the front end surface of the check ring come into contact with each other and slide. It is possible to suppress wear.

さらに、スクリューヘッドの軸部の外周面に螺旋状のフライトを形成することにより、スクリューと共にスクリューヘッドが回転されるとき、より効果的に樹脂流れ部の樹脂材料の流圧を高めることが可能となる。よって、スクリューヘッドの先端部の後端面とチェックリングの先端面とが接触しないようより効果的に抑制することができる。   Further, by forming a spiral flight on the outer peripheral surface of the shaft portion of the screw head, it is possible to increase the flow pressure of the resin material in the resin flow portion more effectively when the screw head is rotated together with the screw. Become. Therefore, it can suppress more effectively so that the rear end surface of the front-end | tip part of a screw head and the front end surface of a check ring may not contact.

さらに、チェックリングの先端面には円周方向に断続的に凹部を複数有することで、スクリューが回転されるとき、より効果的に樹脂流れ部の樹脂材料の流量を高めることが可能となる。   Furthermore, by having a plurality of recesses intermittently in the circumferential direction on the front end surface of the check ring, it is possible to increase the flow rate of the resin material in the resin flow portion more effectively when the screw is rotated.

実施例１の射出成形機の要部を示す断面図である。It is sectional drawing which shows the principal part of the injection molding machine of Example 1. 実施例１のスクリューヘッドのＡ−Ａ線断面図である。FIG. 3 is a cross-sectional view of the screw head of Example 1 taken along line AA. 実施例１のチェックリングを遊嵌したスクリューヘッドを示す斜視図である。It is a perspective view which shows the screw head which loosely fitted the check ring of Example 1. FIG. 実施例２の射出成形機の要部を示す断面図である。It is sectional drawing which shows the principal part of the injection molding machine of Example 2. 実施例２のスクリューヘッドのＡ−Ａ線断面図である。FIG. 5 is a cross-sectional view of the screw head of Example 2 taken along line AA. 実施例２のチェックリングを遊嵌したスクリューヘッドを示す斜視図である。It is a perspective view which shows the screw head which loosely fitted the check ring of Example 2. FIG. 実施例３の射出成形機の要部を示す断面図である。6 is a cross-sectional view showing the main parts of an injection molding machine of Example 3. FIG. 実施例３のスクリューヘッドのＡ−Ａ線断面面図である。It is an AA line sectional view of the screw head of Example 3. 実施例３のチェックリングを遊嵌したスクリューヘッドを示す斜視図である。It is a perspective view which shows the screw head which fitted the check ring of Example 3 loosely.

以下、本発明に係る実施例を図１〜図９により以下に説明する。もちろん、本発明は、その発明の趣旨に反しない範囲で、実施例において説明した以外の構成のものに対しても容易に適用可能なことは説明を要するまでもない。   Embodiments according to the present invention will be described below with reference to FIGS. Needless to say, the present invention can be easily applied to configurations other than those described in the embodiments without departing from the spirit of the invention.

図１は、実施例１の射出成形機１の要部を示している。具体的には、金型のキャビティに樹脂材料を射出する、射出成形機１に構成された射出ユニット２のその一部を示している。同図に示すように、射出ユニット２には、筒型で内部で樹脂材料を加熱溶融する加熱シリンダ３を備え、加熱シリンダ３の先端には射出ノズル４が装着されている。   FIG. 1 shows a main part of an injection molding machine 1 according to the first embodiment. Specifically, a part of the injection unit 2 configured in the injection molding machine 1 for injecting the resin material into the cavity of the mold is shown. As shown in the figure, the injection unit 2 is provided with a heating cylinder 3 which is cylindrical and heats and melts a resin material inside, and an injection nozzle 4 is mounted at the tip of the heating cylinder 3.

加熱シリンダ３内には、金型のキャビティに樹脂材料を射出するときに前進され、可塑化・計量工程を行うときに回転されるスクリュー５が設けられている。   In the heating cylinder 3, there is provided a screw 5 that is advanced when the resin material is injected into the cavity of the mold and rotated when the plasticizing / metering process is performed.

スクリュー５の先端には、円錐状のスクリューヘッド６が螺合により固定されている。スクリューヘッド６は、先端部７と、スクリュー５の先端に螺合される取付部としてのネジ部８と、先端部７とネジ部８とを連結する円柱状の軸部９と、から構成され、先端部７の周方向には、窪み状の樹脂溜まり部１６が断続的に４箇所形成されている。なお、樹脂溜まり部１６は、先端部７の後端面１１よりも前側に位置している。   A conical screw head 6 is fixed to the tip of the screw 5 by screwing. The screw head 6 includes a tip portion 7, a screw portion 8 as an attachment portion screwed to the tip of the screw 5, and a columnar shaft portion 9 that connects the tip portion 7 and the screw portion 8. In the circumferential direction of the distal end portion 7, four recess-like resin reservoir portions 16 are intermittently formed. The resin reservoir 16 is located on the front side of the rear end surface 11 of the front end portion 7.

軸部９には、円筒状のチェックリング１０が遊嵌されている。そして、チェックリング１０は、スクリューヘッド６の先端部７の後端面１１と、軸部９の後部に固着されたシート１２との間で進退可能に設けられている。また、チェックリング１０の先端面１３は、円環で全体に亘って平面状に形成されており、これに臨むスクリューヘッド６の先端部７の後端面１１も円環で全体に亘って平面状に形成されている。そして、チェックリング１０の先端面１３と、スクリューヘッド６の先端部７の後端面１１とは、平行に配設されている。   A cylindrical check ring 10 is loosely fitted on the shaft portion 9. The check ring 10 is provided so as to be able to advance and retreat between the rear end surface 11 of the front end portion 7 of the screw head 6 and the sheet 12 fixed to the rear portion of the shaft portion 9. Moreover, the front end surface 13 of the check ring 10 is formed in a flat shape over the whole with an annular shape, and the rear end surface 11 of the front end portion 7 of the screw head 6 facing the check ring 10 is also formed in a flat shape over the whole with a circular shape. Is formed. The front end surface 13 of the check ring 10 and the rear end surface 11 of the front end portion 7 of the screw head 6 are arranged in parallel.

チェックリング１０と軸部９との間には樹脂材料経路１４を有している。スクリュー５の回転に伴い、当該スクリュー５側から樹脂材料経路１４に供給されてきた樹脂材料は、スクリューヘッド６の先端部７の後端面１１とチェックリング１０の先端面１３との間に有する樹脂流れ部１５を通り、次にスクリューヘッド６先端部７の外側を通りスクリューヘッド６の前方へと供給されるよう、加熱シリンダ３内に設けられているスクリューヘッド６の先端部７と加熱シリンダ３の内壁との間には通路が設けられている。なお、チェックリング１０を後退限まで後退させたときのチェックリング１０と軸部９との間の樹脂材料経路１４の流路面積をａとし、スクリューヘッド６の先端部７の後端面１１とチェックリング１０の先端面１３との間の樹脂流れ部１５の流路面積をｂとすると、ａ＞ｂの関係を有しており、これにより、可塑化工程中にスクリュー５と共にスクリューヘッド６が回転されるときに、樹脂流れ部１５で流れる樹脂材料の流圧を高めることができる。   A resin material path 14 is provided between the check ring 10 and the shaft portion 9. The resin material supplied to the resin material path 14 from the screw 5 side with the rotation of the screw 5 is a resin that is present between the rear end surface 11 of the front end portion 7 of the screw head 6 and the front end surface 13 of the check ring 10. The tip 7 of the screw head 6 provided in the heating cylinder 3 and the heating cylinder 3 so as to be supplied to the front of the screw head 6 through the flow part 15 and then outside the tip part 7 of the screw head 6. A passage is provided between the inner wall and the inner wall. The flow path area of the resin material path 14 between the check ring 10 and the shaft portion 9 when the check ring 10 is retracted to the retreat limit is a, and the rear end surface 11 of the screw head 6 is checked with the rear end surface 11. If the flow passage area of the resin flow part 15 between the front end surface 13 of the ring 10 is b, the relation of a> b is established, whereby the screw head 6 rotates together with the screw 5 during the plasticizing process. When this is done, the flow pressure of the resin material flowing in the resin flow portion 15 can be increased.

以上のように本実施例１の射出成形機１によれば、スクリュー５の回転により、チェックリング１０とスクリューヘッド６の軸部９との間の樹脂材料経路１４からスクリューヘッド６の先端部７側へ、加熱溶融された樹脂材料が供給されるとき、スクリューヘッド６の先端部７の後端面１１とチェックリング１０の先端面１３との間に樹脂流れ部１５を有することで、スクリューヘッド６の先端部７の後端面１１とチェックリング１０の先端面１３との接触を抑制することができる。よって、可塑化工程等のためスクリュー５が回転され、それに伴い、当該スクリュー５と共にスクリューヘッド６が回転されるとき、スクリューヘッド６の先端部７の後端面１１とチェックリング１０の先端面１３とが互いに接触して摺動してしまい摩耗することを抑制することができる。   As described above, according to the injection molding machine 1 of the first embodiment, the distal end portion 7 of the screw head 6 from the resin material path 14 between the check ring 10 and the shaft portion 9 of the screw head 6 by the rotation of the screw 5. When the heated and melted resin material is supplied to the side, the screw head 6 is provided with the resin flow portion 15 between the rear end surface 11 of the front end portion 7 of the screw head 6 and the front end surface 13 of the check ring 10. Contact between the rear end surface 11 of the front end portion 7 and the front end surface 13 of the check ring 10 can be suppressed. Therefore, when the screw 5 is rotated for the plasticizing process or the like, and the screw head 6 is rotated together with the screw 5, the rear end surface 11 of the front end portion 7 of the screw head 6 and the front end surface 13 of the check ring 10 are Can be prevented from sliding and coming into contact with each other.

さらに、樹脂流れ部１５の流路面積ｂは、樹脂材料経路１４の流路面積ａよりも小さいことから、樹脂流れ部１５の流圧を高めることができ、これにより、スクリュー５と共にスクリューヘッド６が回転されるとき、スクリューヘッド６の先端部７の後端面１１とチェックリング１０の先端面１３とが接触しないよう効果的に抑制することができる。   Furthermore, since the flow passage area b of the resin flow portion 15 is smaller than the flow passage area a of the resin material passage 14, the flow pressure of the resin flow portion 15 can be increased. When the is rotated, the rear end surface 11 of the front end portion 7 of the screw head 6 and the front end surface 13 of the check ring 10 can be effectively suppressed from contacting each other.

次に実施例２の射出成形機２０について説明する。実施例２におけるスクリューヘッド６の軸部９には、その外周面に螺旋状のフライト２１が形成されている。それ以外は実施例１の射出成形機１と同じ構成を有しているので、図４〜図６においては、同一箇所には同一の符号を付し、その詳細な説明について省略する。本実施例２においては、前述したように、スクリューヘッド６の軸部９の外周面に螺旋状のフライト２１を形成したことにより、スクリュー５と共にスクリューヘッド６が回転されるとき、より効果的に樹脂流れ部１５の樹脂材料の流圧を高めることが可能となる。よって、スクリューヘッド６の先端部７の後端面１１とチェックリング１０の先端面１３とが接触しないようより効果的に抑制することができ、スクリューヘッド６の先端部７の後端面１１や、チェックリング１０の先端面１３が摺動してしまい摩耗することを効果的に抑制することができる。   Next, the injection molding machine 20 of Example 2 is demonstrated. A spiral flight 21 is formed on the outer peripheral surface of the shaft portion 9 of the screw head 6 in the second embodiment. Since it has the same structure as the injection molding machine 1 of Example 1 other than that, in FIGS. 4-6, the same code | symbol is attached | subjected to the same location and the detailed description is abbreviate | omitted. In the second embodiment, as described above, the spiral flight 21 is formed on the outer peripheral surface of the shaft portion 9 of the screw head 6, so that when the screw head 6 is rotated together with the screw 5, it is more effective. It is possible to increase the flow pressure of the resin material in the resin flow portion 15. Therefore, the rear end surface 11 of the front end portion 7 of the screw head 6 and the front end surface 13 of the check ring 10 can be more effectively suppressed so that the rear end surface 11 of the front end portion 7 of the screw head 6 and the check It can suppress effectively that the front end surface 13 of the ring 10 slides and wears.

次に実施例３の射出成形機３０について説明する。実施例３におけるチェックリング１０の前部は、図７〜図９に示すように、全体に亘って平面形状を有するのではなく、その円周方向に断続的に略Ｖ字型（より詳しくは非対称のＶ字型）の凹部３１が複数設けられている。それ以外は実施例２の射出成形機２０と同じ構成を有しているので、図７〜図９においては、同一箇所には同一の符号を付し、その詳細な説明について省略する。本実施例３においては、チェックリング１０の前部に略Ｖ字型の凹部３１を複数設けたことにより、スクリュー５と共にスクリューヘッド６が回転されるとき、樹脂流れ部１５の樹脂材料の流量を増加することが可能となる。   Next, the injection molding machine 30 of Example 3 will be described. As shown in FIGS. 7 to 9, the front portion of the check ring 10 according to the third embodiment does not have a planar shape throughout, but is intermittently substantially V-shaped (more specifically, in the circumferential direction). A plurality of asymmetric V-shaped recesses 31 are provided. Since it has the same structure as the injection molding machine 20 of Example 2 other than that, in FIG. 7-9, the same code | symbol is attached | subjected to the same location and the detailed description is abbreviate | omitted. In the third embodiment, by providing a plurality of substantially V-shaped concave portions 31 at the front portion of the check ring 10, when the screw head 6 is rotated together with the screw 5, the flow rate of the resin material in the resin flow portion 15 is reduced. It becomes possible to increase.

１ （実施例１の）射出成形機
２ 射出ユニット
３ 加熱シリンダ
４ 射出ノズル
５ スクリュー
６ スクリューヘッド
７ 先端部
８ ネジ部（取付部）
９ 軸部
１０ チェックリング
１１ 後端面
１２ シート
１３ 先端面
１４ 樹脂材料経路
１５ 樹脂流れ部
１６ 樹脂溜まり部
２０ （実施例２の）射出成形機
２１ フライト
３０ （実施例３の）射出成形機
３１ 凹部
ａ 樹脂材料経路の流路面積
ｂ 樹脂流れ部の流路面積 DESCRIPTION OF SYMBOLS 1 (Example 1) Injection molding machine 2 Injection unit 3 Heating cylinder 4 Injection nozzle 5 Screw 6 Screw head 7 Tip part 8 Screw part (attachment part)
DESCRIPTION OF SYMBOLS 9 Shaft part 10 Check ring 11 Rear end surface 12 Sheet 13 Front end surface 14 Resin material path | route 15 Resin flow part 16 Resin pool part 20 (Example 2) Injection molding machine 21 Flight 30 (Example 3) Injection molding machine 31 Recessed part a Flow path area of resin material path b Flow path area of resin flow section

Claims (4)

供給されてきた樹脂材料を加熱溶融する加熱シリンダと、加熱シリンダ内に回転可能に設けられたスクリューと、該スクリューの先端に装着されたスクリューヘッドと、該スクリューヘッドに遊嵌されたチェックリングと、を備えた射出成形機において、
前記スクリューヘッドには、先端部と、前記チェックリングが進退可能に遊嵌された軸部と、前記スクリューに固定される取付部と、を備えており、
前記スクリューの回転により、前記チェックリングと前記軸部との間の樹脂材料経路から供給されてきた加熱溶融された樹脂材料が、前記スクリューヘッドの前記先端部の後端面と前記チェックリングの先端面とが接触しない状態で前記スクリューヘッドの先端部側に供給されるよう、前記スクリューヘッドの前記先端部の前記後端面と前記チェックリングの前記先端面との間に樹脂流れ部を設けたことを特徴とする射出成形機。 A heating cylinder that heats and melts the supplied resin material, a screw that is rotatably provided in the heating cylinder, a screw head that is attached to the tip of the screw, and a check ring that is loosely fitted to the screw head In an injection molding machine equipped with
The screw head includes a tip portion, a shaft portion in which the check ring is loosely fitted so as to advance and retreat, and an attachment portion fixed to the screw.
Due to the rotation of the screw, the heated and melted resin material supplied from the resin material path between the check ring and the shaft portion is the rear end surface of the front end portion of the screw head and the front end surface of the check ring. A resin flow portion is provided between the rear end surface of the tip portion of the screw head and the front end surface of the check ring so that the screw head is supplied to the tip portion side of the screw head without contact with the screw head. Characteristic injection molding machine. 前記チェックリングと前記軸部との間の前記樹脂材料経路に供給されてきた前記樹脂材料を、前記スクリューヘッドの先端部側に押し出す螺旋状のフライトを、前記スクリューヘッドの前記軸部の外周面に設けたことを特徴とする請求項１に記載の射出成形機。   A spiral flight that pushes the resin material that has been supplied to the resin material path between the check ring and the shaft portion toward the tip end side of the screw head, and an outer peripheral surface of the shaft portion of the screw head. The injection molding machine according to claim 1, wherein the injection molding machine is provided. 前記チェックリングの前記先端面は円環な平面状を有し、これに臨む前記スクリューヘッドの前記先端部の前記後端面は円環な平面状を有することを特徴とする請求項１又は２に記載の射出成形機。   The front end surface of the check ring has an annular planar shape, and the rear end surface of the distal end portion of the screw head facing the check ring has an annular planar shape. The injection molding machine described. 前記スクリューヘッドの先端部の前記後端面は円滑な平面状を有し、これに臨む前記チェックリングの前記先端面には円周方向に断続的に凹部を複数有することを特徴とする請求項１又は２に記載の射出成形機。   The said rear end surface of the front-end | tip part of the said screw head has smooth flat shape, and the front-end | tip surface of the said check ring which faces this has several recessed parts intermittently in the circumferential direction. Or the injection molding machine of 2.
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