WO2000015407A1 - Vorrichtung und verfahren zum spritzprägen - Google Patents
Vorrichtung und verfahren zum spritzprägen Download PDFInfo
- Publication number
- WO2000015407A1 WO2000015407A1 PCT/EP1999/006564 EP9906564W WO0015407A1 WO 2000015407 A1 WO2000015407 A1 WO 2000015407A1 EP 9906564 W EP9906564 W EP 9906564W WO 0015407 A1 WO0015407 A1 WO 0015407A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- plate
- plates
- screw drive
- threaded screw
- injection molding
- Prior art date
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
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
-
- 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
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
-
- 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
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
- B29C2045/5655—Injection-compression moulding using a screw mechanism as compression drive means
Definitions
- the invention relates to a device and a method for injection molding with a molding tool and a drive that moves the molding tool.
- the device and the method are used to produce molded parts, in particular molded plastic parts.
- the molding tool usually consists of two plates which can be moved relative to one another, a negative mold of the molded part to be produced being arranged in each plate.
- a negative mold of the molded part to be produced being arranged in each plate.
- the mold is closed, one plate moves towards the other plate until an opening or exit gap is reached.
- the plates enclose a cavity.
- a precisely metered amount of a molding compound is injected into this cavity either via a conventional cold runner or via a hot runner nozzle arranged in a plate.
- the molding compound is then pressurized.
- the plates are moved towards each other until an embossing gap is reached. In this position of the plates, the cavity enclosed by them corresponds to the later molded part. Precise adherence to the embossing gap is a basic prerequisite for achieving a high degree of image accuracy of the molded part produced from the negative mold.
- Another disadvantage is that the molding compound is injected in the hot state and then cools in the mold. The cooling causes the molded part to shrink in volume, which also leads to poorer image accuracy. Since both plates of the molding tool are positioned relative to one another via the stop, there is no possibility of intervening in the shaping process at this time.
- the stop for the positioning of the plates is generally not arranged in the vicinity of the cavity to be filled with molding compound.
- the shape and positional tolerances of the molding tool also contribute to a deterioration in the accuracy of the image.
- extensive changes and adjustments are necessary for changes or after maintenance and repair work.
- a hydraulic system with one or more pumps, lines, pressure accumulators and a large number of valves with the associated control system is also required for the movement of the plates.
- pressure translators are used for support. If the pressure has to be applied very quickly due to the geometry, the effort is particularly high, since large amounts of oil often have to be converted and the fast Control of the valves are very complex.
- every hydraulic system is associated with a certain amount of leakage.
- the object of the invention is to provide a device and a method for injection molding which overcome the disadvantages of the prior art.
- the method and the device are intended to ensure a high level of image accuracy and reproducibility of the molded parts to be produced.
- a device for injection stamping which has a molding tool consisting of several plates, which has at least one plate on which a threaded screw drive is arranged.
- a motor which is connected to a control, is assigned to the threaded screw drive via a gear.
- the plates of the molding tool to be moved are moved in a controlled manner such that they can be positioned continuously or discontinuously with respect to one another.
- the plates of the mold can be positioned exactly in relation to each other during injection molding. This enables the user to intervene in the shaping process at any time.
- the device according to the invention does not require a stop for setting the embossing gap, since the position nation of the plates of the mold is set on the embossing gap via the control of the threaded screw drive. Due to the very precise positionability by means of threaded screw drives, the accuracy of the image is now mainly determined by the negative forms incorporated in the plates. This makes it possible to achieve image accuracy of a few thousandths of a millimeter.
- Another advantage of the positioning of the plates by means of a screw drive is that these systems are not exposed to contamination, as are mechanical stops. This ensures a very high level of reproducibility over very long periods of time. At the same time, previously necessary readjustments are no longer necessary.
- the method according to the invention has the advantage that the plates of the molding tool are no longer moved exclusively between end positions, but that injection molding can now be designed freely. This is made possible by the arbitrary movement of the plates with high accuracy, whereby the positioning of the plates can be carried out in steps up to ⁇ 1 ⁇ m and at different speeds. Processes during injection molding are possible with the method that were previously not feasible. As a result, the process can be optimally adapted to the material and the geometry of the molded part to be produced.
- the movement of the plates of the molding tool can run according to a predetermined program or can be regulated as a function of process parameters, the process parameters being incorporated into the control as control variables.
- the feed for the movement of the plates is regulated depending on the pressure. This makes it possible to avoid image inaccuracies caused by shrinkage, since With this method, a defined pressure can be applied to the molding compound until it has hardened. To do this, the mold cavity pressure is measured and compared with a setpoint. If the cavity pressure drops below the setpoint, the controlled drive moves the plate a defined distance in the direction of the other plate, causing the cavity pressure to rise again.
- the defined paths can be steps from fractions of a millimeter to steps ⁇ 1 ⁇ m. Then the mold cavity pressure is measured again and compared with the setpoint. By repeating this procedure appropriately, a high mold pressure is guaranteed until the molded part has hardened.
- this current consumption is used as a controlled variable in a particularly favorable embodiment of the method according to the invention.
- the use of the current consumption as a process parameter also has the advantage that it can be easily detected and is particularly easily accessible as an electrical variable for the control.
- Another process parameter serving as a control variable for the control is, in a further embodiment of the invention, the force of the threaded screw drive.
- This process parameter is also proportional to the cavity pressure and can be determined with relatively little effort.
- the positioning of the plates for the actual embossing process can begin both after the molding compound has been injected into the mold and during the injection of the molding compound. In the latter In this case, it is advantageous to start the positioning only at the end of the injection process.
- the plate to be moved is either connected to the spindle nut or the threaded spindle of the threaded screw drive.
- the threaded spindle is driven and the plates are positioned relative to one another via the translational movement of the spindle nut.
- the stationary spindle nut is driven and the positioning of the plate takes place through the translational displacement of the threaded spindle.
- a plate of the molding tool is connected to a threaded screw drive.
- the forming tool can be opened and closed with a screw drive, while the other screw drive is used for stamping.
- the embossing can also be carried out with both threaded screw drives, in that both plates are designed as embossing stamps.
- the threaded screw drive is connected to an embossing stamp instead of to a plate.
- the embossing pressure is not applied through the plate, but with the stamp.
- the embossing stamp can also be one or more cores which are arranged in the mold for generating certain geometries.
- interchangeable mold inserts are arranged in the plates, which have the negative shape of the molded part to be produced.
- the threaded screw drive can be connected both to the mold insert and to the plate.
- a further advantageous embodiment consists in arranging a gear, preferably a planetary gear, in order to achieve the high axial forces required for the injection molding between the motor and the threaded screw drive.
- the invention permits numerous embodiments. One of these is described below to illustrate the basic principle.
- the associated figure shows a molding tool with a threaded screw drive, with a fixed spindle nut.
- the device for injection molding comprises a molding tool 1 which has two plates 2, 2 ' . On the opposite end faces 3, 3 ' a negative mold 4 of the molded part to be produced is incorporated into the plate 2.
- a mold insert 5 is arranged, in which a second negative mold 4 ' is incorporated on its side facing the plate 2.
- the mold insert 5 is connected to a threaded spindle 6 of a threaded screw drive 7.
- the threaded spindle 6 is freely movable by means of roller guides 8 in the plates 2 ' and 9.
- a spindle nut 10 driving the threaded spindle 6 is rotatably arranged in a further plate 11 of the molding tool 1.
- the spindle nut 10 is driven via a planetary gear 12 by an electric motor 13, the speed and direction of rotation of which is predetermined by a controller 14.
- the plate 2 moves to the plate 2 ' so that the mold 1 is closed, the mold insert 4 being immersed in the negative form of the plate 2.
- This position of the mold insert 4 corresponds to the opening gap.
- a precisely defined amount of molding compound is now injected into the cavity 16 formed by the negative mold 3 and the mold insert 4 via a hot runner nozzle 15 arranged in the plate 2.
- the molding material as a result of heat conduction does not cool too much, 'heating elements 17 to the temperature control of the plates 2, 2' are arranged in the plates 2; 2.
- the sprue 18 in the hot runner nozzle 15 is closed with a sprue needle 19. Then the threaded spindle 6 is moved to the right over the spindle nut 10 until the mold insert 4 is positioned at a defined distance - the embossing gap - from the negative mold 3 of the plate 2. With this reduction in volume of the cavity 16, the injected molding compound is pressurized so that the molding compound completely fills the cavity 16.
- the positioning of the plate is not uniform, but is regulated by the controller 14.
- the current consumption of the electric motor 13 is used as the controlled variable. For this, the current consumption is measured.
- the plate 2 is moved by 1 ⁇ m in the direction of the plate 2 ' . Then the current consumption is measured again and compared with the setpoint. As long as the measured value is below the target value, the plate 2 is moved step by step. If the measured value is greater than the target value, the electric motor 13 is stopped. After a certain time, the plate 2 is again moved in the direction of the plate 2 ' and the current consumption is measured again. These steps are repeated until the molding compound has solidified. After the molding compound has solidified, the molding tool 1 is opened at its tool part level between the plates 2, 2 ′ and the finished molding is ejected via ejectors 20.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU58612/99A AU5861299A (en) | 1998-09-16 | 1999-09-07 | Device and method for injection-compression moulding |
KR1020017003419A KR20010075155A (ko) | 1998-09-16 | 1999-09-07 | 사출 압축 성형하기 위한 장치 및 방법 |
JP2000569979A JP2002524320A (ja) | 1998-09-16 | 1999-09-07 | 射出圧縮成形のための装置及び方法 |
EP99946137A EP1112161A1 (de) | 1998-09-16 | 1999-09-07 | Vorrichtung und verfahren zum spritzprägen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19842385.3 | 1998-09-16 | ||
DE19842385A DE19842385A1 (de) | 1998-09-16 | 1998-09-16 | Vorrichtung und Verfahren zum Spritzprägen |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000015407A1 true WO2000015407A1 (de) | 2000-03-23 |
Family
ID=7881150
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/006564 WO2000015407A1 (de) | 1998-09-16 | 1999-09-07 | Vorrichtung und verfahren zum spritzprägen |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1112161A1 (de) |
JP (1) | JP2002524320A (de) |
KR (1) | KR20010075155A (de) |
CN (1) | CN1318009A (de) |
AU (1) | AU5861299A (de) |
DE (1) | DE19842385A1 (de) |
WO (1) | WO2000015407A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013212457A1 (de) | 2013-06-27 | 2014-12-31 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Herstellung eines transparenten Formkörpers |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10226301B4 (de) * | 2002-06-13 | 2004-09-23 | Preh Gmbh | Vorrichtung und Verfahren zum Spritzprägen von Kunststoffartikeln sowie nach dem Verfahren hergestelltes Bauteil |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01225525A (ja) * | 1988-03-04 | 1989-09-08 | Nissei Plastics Ind Co | 射出圧縮成形方法および装置 |
EP0338086A1 (de) * | 1987-10-24 | 1989-10-25 | Fanuc Ltd. | Verdichter für einspritzgiessmaschinen |
JPH029614A (ja) * | 1988-06-29 | 1990-01-12 | Japan Steel Works Ltd:The | 電動式射出成形機の射出圧縮制御方法およびその装置 |
JPH02106313A (ja) * | 1988-10-14 | 1990-04-18 | Japan Steel Works Ltd:The | 電動式射出成形機の射出圧縮制御方法およびその装置 |
JPH04312825A (ja) * | 1991-04-12 | 1992-11-04 | Toshiba Mach Co Ltd | 射出成形機の制御方法 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19652028A1 (de) * | 1996-12-13 | 1998-06-25 | Lothar Trier | Verfahren und Einrichtung zur Kunststofformteil-Herstellung, insbesondere Minderdruck-Spritzgießverfahren zur Kunststofformteil-Herstellung |
-
1998
- 1998-09-16 DE DE19842385A patent/DE19842385A1/de not_active Ceased
-
1999
- 1999-09-07 JP JP2000569979A patent/JP2002524320A/ja active Pending
- 1999-09-07 CN CN99811028A patent/CN1318009A/zh active Pending
- 1999-09-07 EP EP99946137A patent/EP1112161A1/de not_active Ceased
- 1999-09-07 KR KR1020017003419A patent/KR20010075155A/ko not_active Application Discontinuation
- 1999-09-07 AU AU58612/99A patent/AU5861299A/en not_active Abandoned
- 1999-09-07 WO PCT/EP1999/006564 patent/WO2000015407A1/de not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0338086A1 (de) * | 1987-10-24 | 1989-10-25 | Fanuc Ltd. | Verdichter für einspritzgiessmaschinen |
JPH01225525A (ja) * | 1988-03-04 | 1989-09-08 | Nissei Plastics Ind Co | 射出圧縮成形方法および装置 |
JPH029614A (ja) * | 1988-06-29 | 1990-01-12 | Japan Steel Works Ltd:The | 電動式射出成形機の射出圧縮制御方法およびその装置 |
JPH02106313A (ja) * | 1988-10-14 | 1990-04-18 | Japan Steel Works Ltd:The | 電動式射出成形機の射出圧縮制御方法およびその装置 |
JPH04312825A (ja) * | 1991-04-12 | 1992-11-04 | Toshiba Mach Co Ltd | 射出成形機の制御方法 |
Non-Patent Citations (4)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 13, no. 545 (M - 902) 6 December 1989 (1989-12-06) * |
PATENT ABSTRACTS OF JAPAN vol. 14, no. 144 (M - 951) 19 March 1990 (1990-03-19) * |
PATENT ABSTRACTS OF JAPAN vol. 14, no. 315 (M - 995) 6 July 1990 (1990-07-06) * |
PATENT ABSTRACTS OF JAPAN vol. 17, no. 133 (M - 1383) 19 March 1993 (1993-03-19) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013212457A1 (de) | 2013-06-27 | 2014-12-31 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Herstellung eines transparenten Formkörpers |
Also Published As
Publication number | Publication date |
---|---|
DE19842385A1 (de) | 2000-03-30 |
JP2002524320A (ja) | 2002-08-06 |
CN1318009A (zh) | 2001-10-17 |
AU5861299A (en) | 2000-04-03 |
KR20010075155A (ko) | 2001-08-09 |
EP1112161A1 (de) | 2001-07-04 |
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