EP1814708A1 - Dispositif de plastification et d'injection - Google Patents

Dispositif de plastification et d'injection

Info

Publication number
EP1814708A1
EP1814708A1 EP05811069A EP05811069A EP1814708A1 EP 1814708 A1 EP1814708 A1 EP 1814708A1 EP 05811069 A EP05811069 A EP 05811069A EP 05811069 A EP05811069 A EP 05811069A EP 1814708 A1 EP1814708 A1 EP 1814708A1
Authority
EP
European Patent Office
Prior art keywords
injection
plasticizing
plasticizing screw
piston
screw
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.)
Withdrawn
Application number
EP05811069A
Other languages
German (de)
English (en)
Inventor
Dudu Cosgun
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Billion SAS
Original Assignee
Billion SAS
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 Billion SAS filed Critical Billion SAS
Publication of EP1814708A1 publication Critical patent/EP1814708A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
    • B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
    • B29C45/541—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw using a hollow plasticising screw co-operating with a coaxial injection ram
    • 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
    • B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
    • B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
    • B29C2045/547—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw continuously rotating plasticising screw cooperating with a single injection plunger
    • 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
    • B29C45/52—Non-return devices

Definitions

  • the invention relates to a plasticizing and injection device for a plastic injection molding machine according to the preamble of claim 1.
  • the screw can not continue to operate during the injection and in the holding pressure phase, which has a negative effect on the cycle time.
  • Another disadvantage is that the dimensioning of the screw must always be a compromise between the plasticizing on the one hand and the injection pressure on the other hand.
  • a plasticizing and injecting device which has a rotationally driven in a plasticizing cylinder Plasticizing, a melt chamber in front of the plasticizing screw for receiving and intermediate storage of plastic melt, and a downstream of the melt chamber injection cylinder has.
  • the injection cylinder can be moved by moving the entire closing unit against it and then as a unit against a stationary injection piston to transfer plastic melt into the closed injection mold.
  • the melt chamber is formed by a recess in the injection piston on the one hand and an extension piece on the plasticizing cylinder on the other.
  • the plasticizing cylinder can be moved back and forth relative to the stationary injection piston in order, on the one hand, to be able to fill the melt chamber and, on the other hand, to displace plastic melt from the melt chamber into the injection cylinder.
  • a channel which connects the melt chamber with the injection cylinder and which is closed by means of a ball gursch lag venti Is during injection against backflow of melt is traversed.
  • the disadvantage is, on the one hand, that the diameter of the injection piston is comparatively large, which has an unfavorable effect on the exact metering of the injection volume.
  • a further plasticizing and injection device which provides a division of the plasticizing functions on the one hand and injection on the other hand.
  • This device has a plasticizing cylinder with a rotating plasticizing screw and an injection piston axially displaceably arranged in the plasticizing screw.
  • the injection piston is a piston rod with a remindströmsperre.
  • Inside the plasticizing screw a collecting space for plastic melt is provided, which is divided by the backflow in two separate collecting chambers, the volume of which is dependent on the position of the remindströmsperre. Both plenums are connected via melt channels in the plasticizing screw with the plasticizing. Plastic melt passes through these channels during the plasticizing process depending on the position of the Injection piston in the front and / or rear plenum.
  • the injection piston After filling the two plenums, the injection piston is moved backwards and displaced plastic melt from the rear plenum through the open remindströmsperre through into the front plenum.
  • the injection piston For injection into an injection mold, the injection piston is moved forward, wherein the rotation of the plasticizing screw is not interrupted.
  • the disadvantage of this is that a high energy consumption is required for the heating of lying in the interior of the plasticizing collection space, since the heat must penetrate the entire thickness of the plasticizing screw.
  • there may also be problems in closing the remindströmsperre because due to the backflow of plastic melt in the screw threads before the backflow preventer may not be sufficient pressure in the plenum before the backflow can be established to allow complete closing of the backflow.
  • the plasticizing and injection device known from GB-A-1015092 likewise discloses a division of the functions plasticizing on the one hand and injection on the other hand.
  • a plasticizing screw is arranged axially fixed and rotationally driven and upstream of the plasticizing an injection cylinder is provided.
  • Inside the plasticizing screw is an injection piston of two separate parts, the rear part protrudes to the rear of the screw and is linearly driven in the direction of injection by means of a single-acting piston-cylinder arrangement.
  • the front part protrudes forward from the screw and has a header with channels in which ball check valves are located. Inside the snail, the two parts abut each other.
  • Plastic melt is metered and the injection piston is in its initial position for the injection process, the rotary drive of the screw is turned off and the melt production stopped. This is imperative insofar as there is no melting chamber available, in which plastic melt could be taken up and temporarily stored during the injection process and possibly also during the holding pressure phase. Nevertheless, if one were to continue to operate the plasticizing screw, a significant pressure would quickly build up behind the ball check valves, which generates a force acting against the direction of injection on the injection piston. This known plasticizing and injection device is thus not very suitable for short cycle times. In addition, there is a considerable risk that the plastic melt in the very narrow gap between the injection piston and the injection cylinder heated to an undesirable extent and possibly decomposition phenomena occur. Furthermore, since the injection piston can only be driven in the direction of injection, the possibility of causing a short-term pressure relief in the melt immediately before injection through a slight stroke to the rear, which is often regarded as advantageous, is eliminated.
  • a plasticizing and injection device for a plastic injection molding machine which has a arranged axially in a plasticizing, rotationally driven plasticizing and arranged in the plasticizing and axially opposite this by means of a linear drive axially forward and strictlybewegbaren injection piston, wherein the injection piston has a non-return valve, and wherein an injection cylinder is provided in front of the plasticizing cylinder.
  • the plasticizing screw does not completely fill the plasticizing cylinder; Rather, the front end of the plasticizing screw is offset from the front end of the plasticizing to the rear to form a prechamber for receiving and buffering of plastic melt.
  • This pre-chamber is dimensioned so large that it can accommodate at a distance from its walls the entire in its diameter relative to the piston rod larger and provided with the backflow preventer injection piston in the starting position for performing the injection process. Since the injection piston is moved out of the injection cylinder for each injection process, accurate metering is difficult to design. In addition, it can easily be damaged at the transition from the antechamber to the injection cylinder when for example, the injection piston deviates slightly from the injection axis. Moreover, one is limited in the selection of usable Ruströmsperren. For example, the known and proven Ring Wegströmsperren can not be provided because the locking ring must not be moved out of the injection cylinder.
  • the present invention seeks to provide a plasticizing and injecting device, which provides a division of plasticizing functions on the one hand and injection on the other hand, but avoids the disadvantages mentioned above. It is a further object of the invention to provide a plasticizing and injecting device which is suitable for short cycle times and at the same time has a high dosing accuracy.
  • the diameter of the plasticizing screw be designed for the desired plasticizing, so comparatively large, and that on the other hand, the diameter of the injection cylinder can be chosen independently comparatively small, in order to achieve a high injection pressure and high precision in terms of injection volume can ,
  • the area of plasticization and the area of injection can be heated independently of each other.
  • a high plasticizing performance and a high dosing accuracy be combined with each other during short cycle times.
  • also suitably long plasticizing screws can be provided, which for example have a length of well over 10D s , where Ds is the screw diameter. In tests good results with lengths between 16D s and 17D S were achieved.
  • An increase in the plastication line can also be achieved by using plasticizing screws with more than one flight (eg two or three) and / or by using so-called barrier screws, which in turn can also have more than one flight (eg two or three).
  • annular gap between the injection piston and the injection cylinder By suitably setting the annular gap between the injection piston and the injection cylinder, a melt chamber optimally tailored to the respective application can be provided.
  • a significant annular gap not only provides sufficient space for receiving and caching plastic melt, but also prevents unwanted heating as in GB-A-1015092.
  • Fig. 2 detail of Figure 1 in an enlarged view;
  • An embodiment of the plasticizing and injection device according to the invention will be described with reference to Figures 1 to 4.
  • a plasticizing screw 8 is rotationally driven via a drive 10 engaging at its rear end, but axially stationary, arranged in a plasticizing cylinder 9 and extends to the front end of this plasticizing cylinder.
  • the front end of the plasticizing screw 8 as shown corresponding to the immediately opposite front end of the plasticizing cylinder 9 may be conical.
  • an injection piston 3 Within a hole passing through the plasticizing screw 8 is an injection piston 3, wherein a sliding and sealing bushing 11 ensures that no melt between the injection piston 3 and the plasticizing screw 8 can settle.
  • the injection piston can be formed as shown in one piece. If necessary, but also several individual pieces can be connected to a common injection piston with each other.
  • the injection piston 3 protrudes a suitable piece beyond the rear end of the plasticizing screw 8 and is connected there to a linear drive 1.
  • the linear drive 1 consists of two hydraulic cylinders 4 and 5, which are arranged on the left and right of the plasticizing cylinder 9 and with which piston rods 16 and 17 can be actuated. About a traverse 18, the two piston rods and the rear end of the injection piston 3 are drivingly connected to each other.
  • the rear end of the injection piston 3 is secured in the crossmember that upon rotation of the plasticizing screw 8 of the injection piston 3 is not rotated.
  • a hydraulic cylinder can be provided coaxially behind the injection piston 3, the piston rod is connected directly to the rear end of the injection piston 3.
  • an injection cylinder 7 and a nozzle 6 are provided in front of this, which are firmly connected to each other by means of suitable fastening means.
  • the diameter D1 of the plasticizing cylinder 9 is significantly larger and the diameter D3 of the nozzle 6 is smaller than the diameter D2 of the injection cylinder 7. The change from D1 to D2 and from D2 to D3 takes place continuously by suitable transition regions.
  • the plasticizing cylinder 9 and the Spritzzyli ⁇ der 7 can be designed as shown as separate parts; but it is also possible that the plasticizing cylinder and the injection cylinder are formed in a one-piece cylinder.
  • the injection piston 3 to a backflow preventer 2 in this case a Ringschreibströmsperre comprising a tip 2a, a locking ring 2b, a pressure ring 2c and one in the injection piston 3 screw-in shaft 2d.
  • a Ringauerströmsperre instead of the Ringauerströmsperre shown but any other type of remindströmsperre be provided, for example, a Kugel Wegströmsperre, a Kulissen Wegströmsperre, combinations of ring and Kugel Wegströmsperren or other configurations.
  • a melt chamber 13 is formed, promoted and cached in the plastic melt.
  • an injection chamber 14 is formed in the injection cylinder 7. Not shown are per se known pressure transducer for measuring the pressure in the injection chamber 14 and / or in the melt chamber 13 in order to control or regulate the rotary drive for the plasticizing screw in dependence on these pressure values.
  • the injection molding cycle is as follows:
  • the injection piston 3 is in its rear position and the injection chamber 14 is filled with plastic melt ( Figures 1 and 2).
  • the injection piston 3 is moved forward. Due to the thus initiated pressure increase in the injection chamber 14 closes the remindströmsperre 2 by the locking ring 2b and the pressure ring 2c in a known manner with their sealing surfaces collide, so that the melt path is blocked, and located in the injection chamber 14 plastic melt is by means of the closed remindströmsperre 2 injected in a form not shown here.
  • the plasticizing screw 8 can be rotated further to promote new plastic melt for the next injection stroke in the injection cylinder 7, in the emptied by injecting annular gap-shaped melt chamber 13 behind the remindströmsperre second ,
  • the injection piston 3 can be moved back into its starting position.
  • the rotation of the plasticizing screw 8 increasingly plastic melt is conveyed into the melt chamber 13.
  • the associated increase in pressure in the melt chamber 13 causes the gearströmsperre 2 opens by the locking ring 2b in a known manner due to the pressure increase of the Pressure ring 2c is lifted.
  • the melt path is now free and the plastic melt supplied by the plasticizing screw 8 can flow from the melt chamber 13 through the opened non-return valve 2 into the injection chamber 14.
  • the backward movement of the injection piston 3 can optionally be influenced by means of the linear drive 1 (supporting or braking). If the injection chamber 14 is filled with the desired volume of plastic melt, the rotational movement of the plasticizing screw 8 can be stopped briefly and the injection piston 3 by means of the linear drive 1 in addition to a small piece to the back to a certain time a pressure relief in the plastic melt in to effect the injection chamber 14.
  • the remindströmsperre 2 now takes in the injection cylinder 7 again their rear position as at the beginning of the previous injection process. Subsequently, the injection piston 3 is moved by means of the linear drive 1 to the front and the cycle begins again, ie the backflow preventer 2 is moved again from its rear starting position to the front end position.
  • 9 new plastic melt is nachge apart by the plasticizing screw to fill the enlarging melt chamber 13 with new plastic melt or to keep filled.
  • the speed of the plasticizing screw 8 can be controlled as a function of the injection speed and, for example, increased to a suitable level in order to increase the plasticizing performance.
  • a sufficiently large amount of plastic melt can be replenished in a relatively short time to keep the melt chamber 13 filled with plastic melt.
  • the hollow cylindrical plasticizing screw 8 On a length L, the hollow cylindrical plasticizing screw 8 has an inner diameter Di which is larger than that Outer diameter D 3 of Einspitzkolbens 3, so that in this area, an annular gap 30 is formed, which is also filled during the dosing with plastic melt.
  • the injection piston 3 In order to displace this plastic melt during the injection process from the annular gap 30 and to be able to move forward, the injection piston 3 has a suitable location around acting as a piston, on the inner diameter D, the hollow cylindrical plasticizing widened section 29.
  • the length and width of the annular gap 30 are set according to the particular application.
  • the number of grooves 28 distributed over the circumference, their shape and cross section and their axial length are suitably selectable by the skilled person depending on the application.
  • the plasticizing cylinder and the injection cylinder are formed in a one-piece cylinder 9 'in Figures 5 to 8. Furthermore, in the embodiments according to FIGS. 5 to 8, the rotational speed of the plasticizing screw in the injection phase may optionally be increased in order to increase the plasticizing performance in these injection-phase embodiments as well.
  • the plasticizing and injection device has the following advantages in combination: a) a high plasticizing capacity by providing a plasticizing screw with a suitably large diameter and / or a barrier screw, optionally with two or more flights, b) precise metering of the injection volume and a high injection pressure by providing an injection cylinder with a comparatively small diameter.

Landscapes

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

Abstract

L'invention concerne un dispositif de plastification et d'injection pour une machine de moulage par injection de matière plastique, comprenant une vis de plastification (8) entraînée en rotation, et montée de manière fixe axialement, et un piston d'injection (3) monté à l'intérieur de la vis de plastification (8), déplaçable axialement en avant et en arrière, par des moyens d'entraînement linéaire (1). Le piston d'injection (3) présente, à son extrémité avant, un clapet anti-retour (2), cependant qu'il est prévu un cylindre d'injection (7), en amont du cylindre de plastification. L'invention est caractérisée en ce que le clapet anti-retour (2) est déplaçable en avant et en arrière au moyen du piston d'injection (3) pour l'exécution d'un processus d'injection, à l'intérieur du cylindre d'injection(7), entre une position arrière au début du processus d'injection, et une position avant, une fois terminé le processus d'injection, et en ce qu'entre l'extrémité avant de la vis de plastification (8) et le clapet anti-retour (2), est configurée une chambre de fusion (13) qui, pendant le processus d'injection et pendant la phase de maintien de la pression, forme une fente annulaire (13) entre le piston d'injection (3) et le cylindre d'injection (7), en vue de recevoir le mélange fondu de matière plastique lorsque la vis de plastification (8) continue de tourner pendant l'injection.
EP05811069A 2004-10-19 2005-10-18 Dispositif de plastification et d'injection Withdrawn EP1814708A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004051105A DE102004051105A1 (de) 2004-10-19 2004-10-19 Plastifizier- und Einspritzvorrichtung
PCT/EP2005/055339 WO2006042849A1 (fr) 2004-10-19 2005-10-18 Dispositif de plastification et d'injection

Publications (1)

Publication Number Publication Date
EP1814708A1 true EP1814708A1 (fr) 2007-08-08

Family

ID=35634955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05811069A Withdrawn EP1814708A1 (fr) 2004-10-19 2005-10-18 Dispositif de plastification et d'injection

Country Status (4)

Country Link
US (1) US7717698B2 (fr)
EP (1) EP1814708A1 (fr)
DE (1) DE102004051105A1 (fr)
WO (1) WO2006042849A1 (fr)

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DE102011017610B3 (de) * 2011-04-27 2012-06-21 Oskar Frech Gmbh + Co. Kg Gießkolben und Gießeinheit mit Absperrventil
CN102922655B (zh) * 2012-11-08 2015-04-29 广西柳州中嘉知识产权服务有限公司 不饱和聚酯团状模塑料注塑机
JP6657550B2 (ja) * 2016-01-25 2020-03-04 株式会社不二越 射出成形機および射出成形方法
CN107672117A (zh) * 2017-11-06 2018-02-09 威塑机械科技（上海）有限公司 注塑机及成型设备
CN110480964A (zh) * 2019-09-18 2019-11-22 浙江金鹰塑料机械有限公司 一线式注射塑化单元
AT525100B1 (de) * 2021-05-20 2023-05-15 Engel Austria Gmbh Einspritzaggregat für eine Formgebungsmaschine
DE102023113310A1 (de) * 2023-05-22 2024-11-28 Technische Hochschule Köln, Körperschaft des öffentlichen Rechts Vorrichtung und Verfahren zur Spritzgießfertigung von Bauteilen
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Also Published As

Publication number Publication date
WO2006042849A1 (fr) 2006-04-27
US7717698B2 (en) 2010-05-18
US20090186115A1 (en) 2009-07-23
DE102004051105A1 (de) 2006-04-27

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