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WO2008007264A2 - Presse d'établi horizontale pour injection de matières thermoplastiques - Google Patents

Presse d'établi horizontale pour injection de matières thermoplastiques Download PDF

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Publication number
WO2008007264A2
WO2008007264A2 PCT/IB2007/052351 IB2007052351W WO2008007264A2 WO 2008007264 A2 WO2008007264 A2 WO 2008007264A2 IB 2007052351 W IB2007052351 W IB 2007052351W WO 2008007264 A2 WO2008007264 A2 WO 2008007264A2
Authority
WO
WIPO (PCT)
Prior art keywords
press according
feed screw
shaft
development
mechanical transmission
Prior art date
Application number
PCT/IB2007/052351
Other languages
English (en)
Other versions
WO2008007264A3 (fr
Inventor
Vanni Arisi
Original Assignee
Vanni Arisi
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 Vanni Arisi filed Critical Vanni Arisi
Publication of WO2008007264A2 publication Critical patent/WO2008007264A2/fr
Publication of WO2008007264A3 publication Critical patent/WO2008007264A3/fr

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
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C45/5008—Drive means therefor
    • 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
    • B29C2045/1784—Component parts, details or accessories not otherwise provided for; Auxiliary operations not otherwise provided for
    • B29C2045/1792—Machine parts driven by an electric motor, e.g. electric servomotor

Definitions

  • the present invention relates to a horizontal bench press for the injection of thermoplastic materials, mixtures of metal powder or thermoplastic powder.
  • the present invention relates to horizontal bench presses for the injection of thermoplastic materials, with low weight and small size, also referred to as "mini-presses”.
  • thermoplastic materials including a supporting structure onto which a stationary vertical plate is fastened.
  • a seat for housing a first half-mold is ob- tained on such stationary plate.
  • Presses of known type comprise a closing assembly including a movable plate on which another seat for housing a second half-mold is obtained. Such plate can be shifted between a first position in which the first and the second half-mold are coupled with each other so as to form a mold, and a second position in which the first and the second half-mold are uncoupled.
  • Known presses further comprise an injection cylinder into which a certain amount of thermoplastic material in powder or granules is introduced, which is melted so as to be introduced into the mold.
  • the injection cylinder houses a feed-pusher, which is suitably shifted so as to feed into the cylinder the thermoplastic material picked up by an appropri- ate hopper, and to inject the melted thermoplastic material into the mold.
  • presses of known type comprises hydraulic actuators supplied by at least one pump.
  • the pump is usually of electric type.
  • horizontal presses of known type have some drawbacks. Presses of known type using shifting means of hydraulic type are generally quite noisy. In order to obviate this drawback, it can be absolutely necessary to equip the press with sound-absorbing shields, with an increase in the overall size.
  • a further drawback consists in that it is necessary to _ o _
  • hydraulic systems prove little effective in energetic terms, since they absorb energy even when drives are deactivated.
  • the circuit must be kept under pressure even when actuators are mo- mentarily not active.
  • the technical task of the present invention consists in proposing a horizontal press for the injection of thermoplastic materials without the disadvantages of prior-art presses.
  • an aim of the present invention is to provide a horizontal bench press for the injection of thermoplastic materials that is noiseless.
  • Still another aim of the present invention is to provide a press with low operating costs.
  • a final aim of the present invention is to provide a press with small overall size.
  • FIG. 1 is a sectional side view of the horizontal press for the injection of thermoplastic materials according to the present invention
  • Figure 2 is a sectional side view of a detail of Figure 1;
  • FIG. 3 is a perspective view of a detail of Figure 1, some parts being removed so as to show others better;
  • Figure 4 is a perspective view of a detail of Figure 3.
  • the numeral 1 globally refers to a horizontal press for the injection of thermoplastic materials according to the present invention.
  • the press 1 comprises a supporting structure 2 developing mainly horizontally, onto which is fastened a stationary vertical plate 3.
  • the latter has a first seat 4 for housing a first half-mold (not shown in the fig- ures ) .
  • the press 1 further includes a closing assembly 5.
  • the latter comprises a movable plate 6 having a second seat 7 for housing a second half-mold (not shown) .
  • Such plate 6 can be shifted between a first position in which the first and the second half-mold are coupled with each other so as to form a mold, and a second position in which the first and the second half-mold are uncoupled.
  • the movable plate 6 slides along suitable guiding bars 8 parallel to each other.
  • the press 1 comprises a housing and supporting box- shaped body 9, which is slidingly associated to the supporting structure 2.
  • the box-shaped body 9 comprises at least one sleeve 10 inserted into a hori- zontal guide 11 secured to the supporting structure 2.
  • the press 1 includes an injection cylinder 12 for melting and injecting the thermoplastic material into the mold.
  • the injection cylinder 12 faces the fist seat 4 of the stationary plate 3.
  • the injection cylinder 12 comprises an end body 13 fastened on a first end 12a thereof and at least partially inserted into a hole 14 obtained in the stationary plate 3.
  • the melted thermoplastic material thus gets out of the injection cylinder 12 through the end body 13 and is injected into the mold ( Figures 2 and 3) .
  • the injection cylinder 12 is fastened to the box-shaped body 9 with a second end 12b thereof, opposite the first one .
  • the injection cylinder 12 further comprises heating means 15 for melting the thermoplastic material.
  • Such heating means 15 include at least one heating element 16 with an electric resistance, wound up on an outer surface 12c of the cylinder 12.
  • the heating means 15 comprise a plurality of heating elements 16 ar- ranged along the outer surface 12c of the cylinder 12.
  • a plurality of temperature sensors 17 is further arranged along the injection cylinder 12.
  • the temperature sensors 17 are thermocouples.
  • the injection cylinder 12 further comprises a feed screw 18 housed therein.
  • the feed screw 18 can be rotated along its own main axis of development X ⁇ X" for introducing a certain amount of solid thermoplastic material.
  • the feed screw 18 can be shifted so as to inject the thermoplastic material, which has been melted by the heating elements 15, into the mold.
  • the feed screw 18 further includes a head body 19 connected to a first end 18a of the feed screw 18 near the first end 12a of the injection cylinder 12.
  • the head body 19 is basically ogive-shaped so as to help the in- jection of the melted thermoplastic material into the mold.
  • the feed screw 18 can be rotated and shifted backward with respect to the stationary plate 3 so as to introduce the thermoplastic material in powder, and forward with respect to the stationary plate 3 so as to inject the melted thermoplastic material into the mold.
  • the feed screw 18 is rotated and shifted backward.
  • the feed screw 18 shifting backward clears a portion of space, thus defining an injection compartment 20.
  • the thermoplastic material in powder is simultaneously picked up by gravity from a hopper 21 connected to the cylinder 12 by means of an access opening 22 obtained on said cylinder 12, and thanks to the rotational motion of the feed screw 18 is conveyed into said injection compartment 20.
  • the thermoplastic material melts.
  • the feed screw 18 is shifted forward without rotating, so as to inject the melted thermoplastic material into the mold, thus emptying the injection compartment 20.
  • the feed screw 18 further comprises a non-return valve 23 for preventing the melted thermoplastic material from leaking out along the feed screw 18 during the injection step.
  • the press 1 further includes a first mechanical transmission 24 for shifting the feed screw 18 along its own axis of development ⁇ X", and a second mechanical transmission 25 for rotating the feed screw 18 around its own axis of development ⁇ X".
  • the press 1 further comprises a first electric motor 26 associated to the first mechanical transmission 24, and a second electric motor 27 associated to the second mechanical transmission 25.
  • the first motor 26 is independent from the second motor 27. Both motors 26, 27 are supported by the box-shaped body 9.
  • the first mechanical transmission 24 comprises a movable slider 28 connected to the feed screw 18 so as to shift the latter along its own axis of development X ⁇ X".
  • the slider 18 is associated to a worm 29.
  • the slider 28 comprises a female screw 30 placed between said slider 28 and the worm 29. During opera- tion, the worm 29, when rotated, shifts the slider 28, which is associated to the feed screw 18 and thus shifts the latter along its own axis of development V X".
  • the worm 29 is fastened to the box-shaped body 9 and shifted by the first electric motor 26.
  • the first electric motor 26 is connected to the worm 29 by means of a suitable gearing 31.
  • the press 1 further comprises a shaft 32 fastened coaxi- ally to the feed screw 18 and connected to the movable slider 28 for shifting and rotating said feed screw 18.
  • the slider 28 is slidingly secured to the shaft 32 and can be rotated with respect to the latter.
  • the movable slider 28, actuated by the worm 29, thus shifts the shaft 32, and therefore the feed screw 18, during the forward and backward movement.
  • the slider 28 enables the rotation of the shaft 32 and of the feed screw 18.
  • the slider 28 has a first through hole 33 arranged near a first end 28a thereof, through which the shaft 32 gets through the slider 28.
  • the slider 28 further has a sec- ond through hole 34 arranged near a second end 28b of the slider 28, opposite the first one, in which the female screw 30 is housed.
  • the slider 28 is T- shaped.
  • the first mechanical transmission 24 comprises at least one pair of opposite conical roller bearings 35, which are placed in the first hole 33 between the slider 28 and the shaft 32.
  • the conical roller bearings 35 enable the slider 28 to transfer to the shaft 32 a force parallel to the axis of development ⁇ X" of the feed screw 18 and allow the latter to rotate with respect to the slider 28 .
  • the slider 28 slides along two parallel rods 26 acting as a guide for preventing unwanted rotations of said slider 28, which might lead to an offset of the shaft 32 and of the feed screw 18 with respect to the injection cylinder 13.
  • the second mechanical transmission 25 is actuated by the second motor 27 for rotating the feed screw 18 and the shaft 32.
  • the shaft 32 is associated to the second motor 27 and is slidingly movable with respect to the latter.
  • the second mechanical transmission 25 further comprises a toothed wheel 37 associated to the second motor 27.
  • the toothed wheel 37 is coupled to the second motor 27 by means of a secondary toothed wheel 37 connected to the second motor 27 ( Figure 4).
  • the toothed wheel 37 further comprises a bushing 38 stiffly connected to its center.
  • the bushing 38 has a plurality of projections 39 placed at the same distance and pointing towards the center of the bushing 38.
  • Said shaft 32 further has a plurality of grooves 40 parallel to the axis of development ⁇ X" of the feed screw 18.
  • the shaft 32 and the toothed wheel 37 are coupled to each other so that the projections 39 of the bushing 38 engage into the grooves 40 of the shaft 32.
  • the shaft 32 can slide inside the bushing 38. Stated otherwise, the shaft 32 is turnably secured to the toothed wheel 37 and slidingly movable with respect to the latter.
  • the press further comprises control means of per se known type, which are therefore not disclosed in detail, operatively connected to the first and second mechanical transmission so as to coordinate the operation thereof, and preferably operatively active so as to control the operation of the first and second electric motor.
  • control means of per se known type, which are therefore not disclosed in detail, operatively connected to the first and second mechanical transmission so as to coordinate the operation thereof, and preferably operatively active so as to control the operation of the first and second electric motor.
  • presses as described above have low operating costs.
  • the press 1 absorbs energy only when the feed screw 18 has to be shifted, since no hydraulic circuits are present that have to be kept un- der constant pressure.
  • the absence of hydraulic circuits means that no operating fluids are present that have to be disposed of, thus increasing press operating costs.
  • An advantage of presses as described above consists in that the mechanical transmissions are designed so as to separate the shifting and the rotational movements of the feed screw 18 from each other.
  • the elements of the mechanical transmissions 24, 25 are simpler and lighter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Saccharide Compounds (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une presse horizontale pour l'injection de matières thermoplastiques, comprenant un premier et un second demi-moule formant un moule. Cette presse (1) comprend en outre une vis d'alimentation (18) qui peut tourner autour de son propre axe de développement (X) pour introduire une matière thermoplastique solide et l'acheminer jusqu'à un moyen de chauffage (15) par l'intermédiaire duquel la matière thermoplastique est fondue, cette vis d'alimentation (18) pouvant être déplacée de façon à injecter la matière thermoplastique fondue dans le moule. La presse (1) selon l'invention comprend par ailleurs une première transmission mécanique (24) pour déplacer la vis d'alimentation (18) le long de son propre axe de développement (X) et une seconde transmission mécanique pour mettre en rotation la vis d'alimentation (18) autour de son propre axe de développement (X).
PCT/IB2007/052351 2006-06-28 2007-06-19 Presse d'établi horizontale pour injection de matières thermoplastiques WO2008007264A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBS2006A000156 2006-06-28
ITBS20060156 ITBS20060156A1 (it) 2006-06-28 2006-06-28 Pressa orizzontale da banco per iniezione di materiali termoplastici

Publications (2)

Publication Number Publication Date
WO2008007264A2 true WO2008007264A2 (fr) 2008-01-17
WO2008007264A3 WO2008007264A3 (fr) 2008-04-17

Family

ID=38904680

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/052351 WO2008007264A2 (fr) 2006-06-28 2007-06-19 Presse d'établi horizontale pour injection de matières thermoplastiques

Country Status (2)

Country Link
IT (1) ITBS20060156A1 (fr)
WO (1) WO2008007264A2 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0239682A2 (fr) * 1981-10-08 1987-10-07 Nissei Plastic Industrial Co., Ltd. Dispositif de moulage par injection
JPH01249419A (ja) * 1988-03-31 1989-10-04 Nissei Plastics Ind Co 射出成形機の射出装置
EP1004421A1 (fr) * 1998-06-16 2000-05-31 Sumitomo Heavy Industries, Ltd. Machine de moulage par injection
US6386853B1 (en) * 1998-10-06 2002-05-14 Mitsubishi Heavy Industries, Ltd. Motor-driven injection driving apparatus for an injection molding machine
US20030185932A1 (en) * 2000-05-24 2003-10-02 Franz Chromy Injection screw drive of a plastic injection molding machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0239682A2 (fr) * 1981-10-08 1987-10-07 Nissei Plastic Industrial Co., Ltd. Dispositif de moulage par injection
JPH01249419A (ja) * 1988-03-31 1989-10-04 Nissei Plastics Ind Co 射出成形機の射出装置
EP1004421A1 (fr) * 1998-06-16 2000-05-31 Sumitomo Heavy Industries, Ltd. Machine de moulage par injection
US6386853B1 (en) * 1998-10-06 2002-05-14 Mitsubishi Heavy Industries, Ltd. Motor-driven injection driving apparatus for an injection molding machine
US20030185932A1 (en) * 2000-05-24 2003-10-02 Franz Chromy Injection screw drive of a plastic injection molding machine

Also Published As

Publication number Publication date
WO2008007264A3 (fr) 2008-04-17
ITBS20060156A1 (it) 2007-12-29

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