WO2009118919A1 - Machine à mouler par injection et son procédé de moulage par injection - Google Patents

Machine à mouler par injection et son procédé de moulage par injection Download PDF

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Publication number
WO2009118919A1
WO2009118919A1 PCT/JP2008/060600 JP2008060600W WO2009118919A1 WO 2009118919 A1 WO2009118919 A1 WO 2009118919A1 JP 2008060600 W JP2008060600 W JP 2008060600W WO 2009118919 A1 WO2009118919 A1 WO 2009118919A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
molding material
heating cylinder
injection molding
axial direction
Prior art date
Application number
PCT/JP2008/060600
Other languages
English (en)
Japanese (ja)
Inventor
俊道 西澤
Original Assignee
Nishizawa Toshimichi
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nishizawa Toshimichi filed Critical Nishizawa Toshimichi
Priority to KR1020107015128A priority Critical patent/KR101205659B1/ko
Priority to CN2008801245742A priority patent/CN101909849A/zh
Publication of WO2009118919A1 publication Critical patent/WO2009118919A1/fr

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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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/58—Details
    • B29C45/60—Screws
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/58—Details
    • B29C45/62—Barrels or cylinders

Definitions

  • the present invention relates to an injection molding machine, and more particularly to an in-line screw type injection molding machine suitable for injection molding of a thermoplastic resin and an injection molding method using the same.
  • a screw is rotated by a rotation driving means, and the molding material supplied into the heating cylinder from the base end side of the heating cylinder is plasticized by the rotation of the screw, thereby heating the cylinder. If the predetermined amount of plasticized and melted molding material is weighed at the tip of the heating cylinder by feeding it to the tip side and moving the screw axially rearward, the screw is moved forward by the axial movement means and plasticized. The molded molding material is injected from the tip of the heating cylinder and filled into a mold clamped by a mold clamping device.
  • the heating cylinder is connected to the cylindrical main body portion to which the molding material is supplied and the front end of the main body portion, and the taper is formed in a tapered shape toward the nozzle hole.
  • the taper angle of the taper portion of the heating cylinder is configured to exceed 20 °.
  • Japanese Patent Laid-Open No. 06-166070 JP 2002-001782 A Japanese Patent Laid-Open No. 2001-269973 JP 2005-329722 A JP 07-148785 A JP 09-057801 A Japanese Patent Laid-Open No. 06-055594 JP 07-294340 A
  • thermoplastic resin In the injection molding of thermoplastic resin, a plasticized molding material with a relatively high temperature (150 ° C to 400 ° C) is injected from the tip of the heating cylinder, and inside the mold cavity at a relatively low temperature (30 ° C to 120 ° C). And the filled molding material is cooled and solidified in the cavity of the mold.
  • the molding material is injected and filled into the mold, if the injection speed of the molding material from the heating cylinder (or the filling speed of the molding material into the mold) is slow, the mold is filled during the filling of the mold cavity.
  • thermoplastic resin is ideally filled with the molding material in the cavity of the mold instantly by ultra-high speed injection.
  • ultra-high-speed and ultra-high-pressure injection molding machine capable of performing ultra-high-speed injection, and capable of ultra-high-pressure injection to realize the ultra-high-speed injection was actively conducted.
  • the molded product molded with this ultra-high-speed / high-pressure injection molding machine has a problem that the strength of the molded product is greatly reduced due to local heat generated locally by the molding material (resin). was there.
  • the present invention has been made in view of the above circumstances, and an object thereof is to improve the quality of a molded product obtained by injection of a plasticized molding material at an ultrahigh speed and an ultrahigh pressure.
  • the present invention provides a heating cylinder for heating a molding material, a screw housed in the heating cylinder so as to be rotatable and movable in an axial direction, and a rotational driving means for rotationally driving the screw. And axial movement means for moving the screw in the axial direction, the screw is rotated by the rotation driving means, and the molding material supplied into the heating cylinder is plasticized by the rotation of the screw. Then, the screw is sent to the tip of the heating cylinder, the screw is moved rearward in the axial direction, and a predetermined amount of the plasticized and melted molding material is measured at the tip of the heating cylinder.
  • the heating cylinder is a molding material A cylindrical main body portion to be supplied, and a tapered portion which is provided in connection with the tip of the main body portion and is tapered toward the nozzle hole, and the taper angle of the tapered portion of the heating cylinder is 3 ° or more. It is configured to be 20 ° or less.
  • the surface temperature of the inner wall of the tapered portion of the heating cylinder may be maintained at a temperature of ⁇ 5 ° C. or higher as compared with the actual temperature of the molding material housed in the tapered portion and in a plasticized state.
  • the rotation control means includes a control means for controlling the axial movement means.
  • the control means moves the screw forward in the axial direction by the axial movement means after the screw is moved a predetermined distance rearward in the axial direction. It may be controlled so that the time until it is moved to within a predetermined time.
  • the present invention in the injection molding of a thermoplastic resin (molding material) by an in-line screw type injection molding machine, when the ultra-high speed / ultra-high pressure injection molding is executed, the local heating of the molding material locally becomes abnormally high. Because it can be prevented, ideal ultra-high-speed and ultra-high-pressure injection molding without mixing of molding material with reduced plasticity, which is caused by the slow filling speed of the cavity in the current low- and medium-speed injection molding An excellent effect is achieved that the process can be realized and the quality performance of the obtained molded product can be remarkably improved.
  • FIG. 1 is a side sectional view of an injection molding machine according to an embodiment of the present invention, showing a state in which a screw is retracted.
  • FIG. 2 is a side sectional view of the injection molding machine according to the embodiment of FIG. 1 and shows a state where the screw has advanced.
  • FIG. 3 is a graph showing the relationship between the tip angle of the heating cylinder (taper angle ⁇ of the tapered portion of the heating cylinder) and the tensile strength of the molded product.
  • FIG. 4 is a graph showing the relationship between the injection speed and the molded product tensile strength for each heating tube tip angle (taper angle ⁇ of the tapered portion of the heating tube).
  • FIG. 5 is a graph showing the relationship between the molded product weight and the molded product tensile strength.
  • FIG. 6 is a graph showing the relationship between the temperature difference in the heating cylinder and the incidence of low-strength molded products.
  • FIG. 7 is a graph showing the relationship between the metered resin storage time and the molded product tensile strength.
  • FIG. 8 is a side sectional view of an injection molding machine according to another embodiment, showing a state in which the screw is retracted.
  • FIG. 9 is a side sectional view of the injection molding machine according to the embodiment of FIG. 8 and shows a state where the screw has advanced.
  • FIG. 10 is a side sectional view of an injection molding machine according to another embodiment, showing a state in which the screw is retracted.
  • FIG. 11 is a side sectional view of the injection molding machine according to the embodiment of FIG. 10 and shows a state where the screw has advanced.
  • FIG. 1 is a side sectional view of an injection molding machine according to an embodiment of the present invention, showing a state in which a screw is retracted.
  • FIG. 2 is a side sectional view of the injection molding machine according to the embodiment of FIG. 1 and shows a state where the screw has advanced.
  • an injection molding machine 10 is an inline screw type injection molding machine.
  • the injection molding machine 10 includes a hopper 11 that stores a pellet-shaped molding material (resin material), a heating cylinder (heating cylinder) 12 that heats and melts the molding material supplied from the hopper 11, and a rotation inside the heating cylinder 12.
  • a screw 13 that is freely movable in the axial direction, a rotation driving means 14 that rotationally drives the screw 13, an axial movement means 15 that moves the screw 13 in the axial direction, the rotational driving means 14, and the axial direction
  • a control means (controller) 16 for controlling the moving means 15.
  • the heating cylinder 12 includes a cylindrical main body portion 17 to which a hopper 11 is connected and a molding material is supplied from the hopper 11, and an injection nozzle portion 18 that is detachably attached to the tip of the main body portion 17. It is composed of The injection nozzle portion 18 has a nozzle hole 19 formed at the tip thereof, and a taper portion 20 that is connected to the tip of the main body portion 17 and is tapered toward the nozzle hole 19.
  • the taper part 20 of the heating cylinder 12 is configured such that the taper angle (heating cylinder tip angle) ⁇ is 3 ° or more and 20 ° or less, more preferably 3 ° or more and 15 ° or less (illustrated example). Then, 12 degrees).
  • a heater (cartridge heater, band heater, etc.) 21 is mounted on the outer periphery of the heating cylinder 12 (main body portion 17 and injection nozzle portion 18). The heating cylinder 12 is heated by the heater 21.
  • the screw 13 includes a screw main body 23 having a helical groove 22 and a screw head 24 that is detachably attached to the tip of the screw main body 23.
  • the spiral groove 22 formed in the screw body 23 is The depth is set to be deepest on the base end side and appropriately shallower toward the front end side.
  • the tip of the screw head 24 has a conical shape.
  • a backflow prevention ring (check ring) 25 is attached to the small diameter portion of the screw head 24.
  • the backflow prevention ring 25 allows the plasticized molding material to be sent out to the front end side of the heating cylinder 12 during the rotation of the screw 13, and is plasticized when the screw 13 moves forward to form the inside of the tapered portion 20 and the cylindrical main body.
  • the molding material accommodated inside the front end portion of the portion 17 is prevented from flowing backward to the rear end side of the heating cylinder 12.
  • the control means (controller) 16 controls the rotation drive means (motor, etc.) 14 and the axial movement means (motor, hydraulic cylinder, etc.) 15 etc. according to a predetermined program based on input signals from various sensors (not shown). It is supposed to be.
  • the molding material is supplied into the main body 17 of the heating cylinder 12 by the hopper 11.
  • the heating cylinder 12 (the main body portion 17 and the injection nozzle portion 18) is heated by a heater 21 to a temperature suitable for melting the molding material.
  • the surface temperature of the inner wall of the tapered portion 20 of the heating cylinder 12 and the inner wall of the distal end side portion of the cylindrical main body portion 17 is the inner temperature of the tapered portion 20 and the distal end of the cylindrical main body portion 17.
  • the controller 16 rotationally drives the screw 13 by the rotation driving means 14, the molding material supplied into the main body 17 of the heating cylinder 12 is plasticized and plasticized by the rotation of the screw 13.
  • the formed molding material is fed into the tapered portion 20 on the tip side of the heating cylinder 12.
  • the controller 16 is configured to rotate the screw 13 by the rotation driving means 14 while applying a predetermined back pressure to the screw 13 by the axial movement means 15, and within the tapered portion 20 and the cylindrical main body portion.
  • the screw 13 is retracted by the pressure of the molding material in a plasticized state.
  • the controller 16 If the controller 16 detects that the screw 13 has been retracted by a predetermined distance and a predetermined amount of molding material has been accommodated in the taper portion 20, the controller 16 holds the position of the screw 13 with the axial movement means 15 and rotates it. The rotation of the screw 13 by the driving means 14 is stopped. Thereafter, when the controller 16 advances the screw 13 at a predetermined speed by the axial direction moving means 15, the molding material plasticized and accommodated in the tapered portion 20 by the advance of the screw 13 is a nozzle at the tip of the heating cylinder 12. The molding material injected from the hole 19 and plasticized is filled into a mold clamped by a mold clamping device.
  • the controller 16 has a time (measurement resin storage time) from when the screw 13 is retracted by a predetermined distance (measurement completion) to when the screw 13 is advanced by the axial movement means 15 (injection start). Control is performed within a predetermined time (for example, within 5 minutes, more preferably within 10 minutes).
  • the present inventor studied the cause of the strength reduction of the molded product due to the ultra-high-speed and ultra-high-pressure injection, and found the essential cause.
  • the present inventor shows that in the molding machine in which the taper angle ⁇ of the taper portion 20 of the heating cylinder 12 is 20 ° or less, local heat generation of the molding material (resin) that is locally abnormally high is suppressed. As shown in FIGS. 3 and 4, even when the plasticized molding material is injected at an ultra-high speed, the strength of the molded product is not significantly reduced. ⁇ It was found that the strength of the molded product was improved by the effect of ultra-high pressure injection.
  • the pressure loss occurs more concentrated on the tip of the tapered portion 20 and the inner wall of the nozzle hole 19 as the plasticized molding material is injected at a higher speed.
  • the self-heating (shearing heat) of the molding material itself is concentrated, and local heating that is locally abnormally high occurs, and the injection molding material does not generate heat uniformly. If the temperature of the molding material that is injected and filled in the mold is not uniform, the molding material that has become extremely hot locally will decompose (lower molecular weight) and change its quality, or the shrinkage due to cooling of the molding material will be uneven. As a result, the strength of the molded product is reduced, and the dimensional accuracy of the molded product is significantly reduced.
  • the taper angle ⁇ of the taper portion 20 of the heating cylinder 12 is 3 ° or more and 20 ° or less, more preferably 3 ° or more and 15 ° or less.
  • the local heat generation which is locally abnormally high, is suppressed, and the temperature of the molding material injected and filled in the mold becomes uniform, so it can be obtained by injection of plasticized molding material at ultra high speed and ultra high pressure It becomes possible to improve the quality of the molded product.
  • the quality of the molded product is remarkably improved as compared with the molded product by the conventional molding machine in which the taper angle ⁇ exceeds 20 °.
  • a low-strength molded product having a light weight was occasionally generated. It has been found that the low-strength molded product having a light weight is inferior to the strength of the average-weight molded product.
  • This low-strength molded product that is light in weight is such that the surface temperature of the inner wall of the tapered portion 20 of the heating cylinder 12 and the inner wall of the distal end side portion of the cylindrical main body portion 17 It has been found that this occurs when the temperature is lower than a predetermined temperature compared to the actual temperature of the molding material contained in the portion and in a plasticized state.
  • Molding material in which the surface temperature of the inner wall of the taper portion 20 and the inner wall of the tip end portion of the cylindrical main body portion 17 is housed in the taper portion 20 and the tip end portion of the cylindrical main body portion 17 and is in a plasticized state. If the temperature is lower than the actual temperature of the (resin) by a predetermined temperature or more, the actual temperature of the molding material that comes into contact with the inner wall of the tapered portion 20 or the inner wall of the distal end portion of the cylindrical main body portion 17 is lowered. As a result, the flowability of the molding material whose actual temperature has decreased is deteriorated, and the molding material stays in the tapered portion 20 or the tip side portion of the cylindrical main body portion 17.
  • the molding material staying in the taper portion 20 or in the tip side portion of the cylindrical main body portion 17 changes in quality and loses its plasticity.
  • the molding material staying and changing in the tapered portion 20 or in the distal end portion of the cylindrical main body portion 17 is peeled off from the inner wall of the tapered portion 20 or the inner wall of the distal end portion of the cylindrical main body portion 17 and mixed.
  • the molding material flow path sprue, runner, gate
  • the mold cavity has insufficient filling amount.
  • the weight of the molded product is reduced and the strength of the molded product is reduced.
  • a deteriorated molding material is mixed into a molded product, for example, it becomes a starting point of fracture in a tensile strength test, and the strength of the molded product is remarkably lowered.
  • the surface temperature of the inner wall of the tapered portion 20 of the heating cylinder 12 and the inner wall of the distal end portion of the cylindrical main body portion 17 (heating cylinder inner wall temperature) is set to the inside of the tapered section 20 and the cylindrical Compared to the actual temperature of the molding material housed in the distal end portion of the main body portion 17 and in a plasticized state (actual temperature of the metering resin), it should be ⁇ 5 ° C. or more, preferably in the range of ⁇ 5 ° C. to + 20 °
  • the mixed molding material can be prevented from being mixed. Therefore, as shown in FIG. Occurrence can be prevented.
  • the upper limit of the temperature difference between the heating cylinder inner wall temperature and the measured resin actual temperature is preferably + 20 ° C. If the temperature difference in the heating cylinder is + 30 ° C or higher, the upper end of the heating cylinder 12 is accommodated. This is because the molding material in a plasticized state is rapidly reduced in molecular weight by thermal decomposition, and the allowable time from the completion of measurement to the start of injection becomes too short, which is not practical.
  • the quality of the molded product is remarkably improved as compared with the molded product by the conventional molding machine in which the taper angle ⁇ exceeds 20 °.
  • a low-strength molded product with a heavy weight was occasionally generated. It has been found that the low-strength molded product having a heavy weight is inferior to the strength of the average-weight molded product.
  • the low-strength molded product having a heavy weight occurs when the time from when the screw 13 is retracted by a predetermined distance until the screw 13 is advanced by the axial movement means 15 is longer than usual.
  • the molding material (resin) accommodated in the tapered portion 20 is heated or heated by the heater 21.
  • the molding material maintained at a high temperature or at a high temperature has a low molecular weight and fluidity is improved, and the filling amount of the molding material into the mold cavity becomes excessive.
  • the weight of the molded product increases, and the strength of the molded product decreases due to the resin having a low molecular weight.
  • the time from when the screw 13 is retracted by a predetermined distance until the screw 13 is advanced by the axial movement means 15 is a predetermined time.
  • the time from when the screw 13 is retracted by a predetermined distance until the screw 13 is advanced by the axial movement means 15 is a predetermined time.
  • a tip passage 26 having a substantially constant cross-sectional area toward the nozzle hole 19 may be formed between the tip of the tapered portion 20 and the nozzle hole 19.
  • a tip passage 27 that is tapered toward the nozzle hole 19 may be formed between the tip of the tapered portion 20 and the nozzle hole 19.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

La présente invention permet d’améliorer la qualité du moulage d’un produit obtenu par injection d’une matière à mouler plastifiée à une très grande vitesse et à une très haute pression. La machine à mouler par injection faisant l’objet de cette invention est munie d’une vis en ligne et comprend : un tube chauffant (12) qui chauffe la matière à mouler ; une vis (13) rotative et mobile axialement qui est disposée dans le tube chauffant (12) ; des moyens de mise en rotation (14) qui mettent la vis (13) en rotation ; et des moyens de déplacement axial (15) qui assurent le déplacement axial de la vis (13). Le tube chauffant (12) possède une partie corps principal cylindrique (17) qui contient la matière à mouler, ainsi qu’une partie conique (20) qui est reliée à l’extrémité distale de la partie corps principal (17) et qui devient de plus en plus étroite à mesure qu’on se rapproche du trou d’injection (19). L’angle (θ) du cône de la partie conique (20) du tube chauffant (12) est compris entre 3 et 20°.
PCT/JP2008/060600 2008-03-27 2008-06-10 Machine à mouler par injection et son procédé de moulage par injection WO2009118919A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020107015128A KR101205659B1 (ko) 2008-03-27 2008-06-10 사출 성형기 및 그것을 사용한 사출 성형 방법
CN2008801245742A CN101909849A (zh) 2008-03-27 2008-06-10 注射成型机以及使用它的注射成型方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-083657 2008-03-27
JP2008083657A JP4146509B1 (ja) 2008-03-27 2008-03-27 射出成形機及びそれを用いた射出成形方法

Publications (1)

Publication Number Publication Date
WO2009118919A1 true WO2009118919A1 (fr) 2009-10-01

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PCT/JP2008/060600 WO2009118919A1 (fr) 2008-03-27 2008-06-10 Machine à mouler par injection et son procédé de moulage par injection

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JP (1) JP4146509B1 (fr)
KR (1) KR101205659B1 (fr)
CN (1) CN101909849A (fr)
WO (1) WO2009118919A1 (fr)

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Publication number Priority date Publication date Assignee Title
US8395051B2 (en) * 2008-12-23 2013-03-12 Intel Corporation Doping of lead-free solder alloys and structures formed thereby
CN102582043B (zh) * 2012-02-09 2014-04-02 北京化工大学 一种全电动超高速注塑成型机
CN103192486B (zh) * 2013-03-24 2014-12-03 北京化工大学 一种全电动弹射式超高速注塑成型机
KR20150145759A (ko) 2014-06-19 2015-12-31 (주)유니벨 사출성형기용 누출 용융수지의 감지 장치
KR20150145760A (ko) 2014-06-19 2015-12-31 (주)유니벨 사출성형기의 누출 용융수지의 감지시스템

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07223245A (ja) * 1994-02-10 1995-08-22 Matsuda Seisakusho:Kk 射出成形機におけるバリレス成形方法とその装置
WO2004048069A1 (fr) * 2002-11-26 2004-06-10 Sanjo Seiki Co., Ltd Machine de moulage par injection

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2705297Y (zh) * 2004-06-11 2005-06-22 宁波南嵘机械有限公司 软性粘稠半固态塑料的注射装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07223245A (ja) * 1994-02-10 1995-08-22 Matsuda Seisakusho:Kk 射出成形機におけるバリレス成形方法とその装置
WO2004048069A1 (fr) * 2002-11-26 2004-06-10 Sanjo Seiki Co., Ltd Machine de moulage par injection

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KR20100101643A (ko) 2010-09-17
JP4146509B1 (ja) 2008-09-10
JP2009234063A (ja) 2009-10-15
KR101205659B1 (ko) 2012-11-27
CN101909849A (zh) 2010-12-08

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