FR2468457A1 - MOLD CLOSURE INSTALLATION FOR INJECTION MOLDING MACHINES - Google Patents

Abstract

at. Installation comprising two mounting tool mounting plates 2 and 3, one of which 2 is movable relative to the other, controlled by two lateral displacement cylinders 4, closing and locking cylinders, signal carriers 11 cooperating with receptor organs 10. b. Characterized in that the displacement cylinders 4 are mounted in a support 15 with an articulation 6, rigidly connected to the fixed plate 3, the ends of the piston rods 7 being mounted in an articulation 8, provided in a support 9 fixed on columns 5 of the closing and locking installation, signal receivers 10 being provided on this support 9, in connection with a signal carrier 11 which is fixed on a support 12 connected to the fixed frame. vs. Installation applicable to injection machine molds.

Description

The invention relates to a mold closing installation for

  Injection molding machines consisting of two tool mounting plates, one of which is movable relative to the other in the closing and opening direction of the tool. It is known to have one or more sliding cylinders in the space included behind the movable mounting plate. Solutions of this kind are described in patents DE 1136 799 and 2 102 722 and in the journal

  "Kunststoffe" of June 1977 page 329.

  The arrangement of the sliding cylinder behind

  the movable tool mounting plate however has the incon-

  that this results in very long lengths of construction

  In addition, it is necessary to provide additional support devices for the sliding cylinder or cylinders. Added to this is the fact of the need for a relatively large area for

  the assembly of these injection molding machines.

  In order to avoid these disadvantages, injection molding machines have already been developed in which

  the sliding rolls are arranged on the lateral faces

  close to the tool mounting plates, outside the tool space. The free end of the piston rod can then be arranged on the fixed mounting plate as well as on the movable mounting plate and the cylinders in the inverted position in correspondence. In the patent DE 1 483 532 and the patent DE 1 912 240 are represented

solutions of this kind.

  The disadvantage of these solutions is that the

  curvature forces created by the application of the iron force

  on the tool mounting plates have the effect of curvature of the cylinders, so that their guides and their seals are subject to excessive stress which cause oil leaks

  important and thus premature wear.

  DE 122 667 describes a solution in which the sliding rolls are arranged under the tool mounting plates in the lower part of the injection molding machine. The cylinder is then connected, on the one hand, to the lower part of the machine-, and there stem

  piston is connected to the movable mounting plate.

  The disadvantage of this solution lies in that the acceleration and braking of the movable plate create torques by which is caused a tilting movement and thus premature wear of the guideways. All the solutions described above have the further disadvantage that the cylinder stroke of

  must be of sufficient length for the

  of the tool and that, in addition, for adjusting the height of

  the stroke of the tool, this stroke shall be the difference between the maximum build height and the minimum build height. As a result, the length of the mold closing installation has to be of great

corresponding value.

  In addition, the positioning device consisting of signal carriers and signal receivers for the trigger signals depending in their stroke of the position of the plate, intended to control the working progress of the machine to be molded by Injection must be repositioned each time

  the construction height of the tools.

  In order to avoid this need for a new position

  In the DD 91 552 patent, it has been proposed in the patent document DD 91 552 to provide, by means of an additional drive, during the adjustment of the construction height of the tools, a relative displacement between the

  movable plate and positioning installation. This solution

  However, it requires a considerable extra cost.

  In an older solution, described in DE 1,159,137, the slide rolls are arranged laterally to the tool mounting plates. The cylinder is then secured by means of a locking device to one of the two mounting plates, and the piston rod is attached to the other plate. If the blocking device is released, the

  cylinder can be moved longitudinally in

  weight with the tool height to be adjusted. As a result, the additional extension of the stroke for the cylinder, to account for the difference of the various tool heights,

no longer necessary.

  The disadvantage of this solution is that it is necessary to provide a high labor cost, inevitable for the loosening of the locking device and the displacement

  of the cylinder. The curvature deformation of the plates is trans-

  When the cylinder is put on, the oil supply can only take place through flexible pipes. On the other hand, a new positioning of the signal carriers and receivers is

  still necessary for each modification of the height of the tools.

  The purpose of the invention is to shorten the length of

  construction of the mold closure system,

  the expenditure of manpower and technique when adjusting the height of the tools and finally to avoid the solicitations

  bending on the sliding cylinders.

  The invention proposes to have the cylinders and the positioning installation dependent on the race, without

  additional position adjustment devices for obtaining

  relative displacement, so that, independently of the

  of the tool height adjustment, the slide cylinders and the signal-carrying members of the positioning system are designed only for

  run of the tool mounting plate, so that the cylinders

  are not subjected to bending stresses,

  when the closing force of the mold is applied.

  For this purpose, the installation according to the invention is characterized in that the displacement cylinders are mounted in a support, with a hinge, rigidly connected to the fixed plate, the ends of the piston rods being mounted in a hinge, provided in a support fixed on columns of the closure and locking system,

  signal receivers being provided on this support, in connection

  sound with a signal carrier that is attached to a connected support

fixed frame.

  According to another embodiment of the invention,

  the piston rods of the displacement cylinders

  plates are each connected to a threaded spindle

  mediate a joint. On these threaded spindles are nuts provided with toothed crowns for adjusting the height position of the tools. The nuts are mounted in bearing shells which are arranged on the locking device and which are connected to the movable plate by means of spacing sleeves. At the end of

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  each of the threaded pins is fixed a vertical rigid support.

  These supports are each supported sliding in a sleeve in the column above or below. A support is

  provided with an extension on which the recipient organ is

  signal carrier, while the signal carrier is fixed on a

  support plate in which the columns are supported.

  The installation of the invention is described below with the aid of two exemplary embodiments, with reference to the appended drawings in which: FIG. 1 shows a mold closing installation with two tool mounting plates and columns

  free support in its open position.

  FIG. 2 is a side elevational view of

the installation of Figure 1.

  FIG. 3 is a view of the installation in position

closure.

  FIG. 4 shows a mold closing installation with columns supported in the two tool mounting plates and which are supported on a support plate

additional.

  FIG. 5 is a view of the detail "Z" of FIG. 4 of the support of the threaded spindle which is connected to the cylinder;

of displacement.

  The mold closing apparatus shown in Fig. 1 comprises a base frame 1 on which are disposed the movable tool mounting plate 2 and the fixed tool mounting plate 3. Laterally to the fixed plate are

  mounted the sliding rollers 4, facing each other diagonally

  nally, in supports 15 which are provided with an articula-

  These supports 15 are rigidly connected to the fixed mounting plate 3. From the side of their piston rod, the cylinders 4 are supported in hinges 8 which are at the end of vertical supports 9 which are themselves rigidly connected to the superimposed vertical columns 5. On one of the supports 9 are arranged the signal receiving members 10 which are in operative connection with the signal carrier 11 which is fixed to a support 12. The supports 12 are screwed onto the frame

  basic 1 of the molding machine. Columns 5 which constitute

  killed as clamping sleeves are freely supported in the movable tool mounting plate. Using a mechanism

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  displacement (not shown) the columns 5 can be moved and adjusted, by means of a combination nut 14, in the longitudinal direction, for adaptation to the height of the tool. Thanks to the supports 15 arranged on the plate of

  fixed stage 3, and the mounting of the cylinders 4 in the articula-

  6 and 8 of the supports 9 and 15, no bending tension is transmitted on the cylinders during the application of the closing force. Premature wear of the cylinders is thus

  avoided and oil losses are reduced.

  In Figure 3 hisrepresented the application process

  cation of the closing force, and the curvature of the mounting plate 3 which results, which shows that, thanks to the articulated assembly, no bending stress is exerted on

the cylinders.

  During the separation and close move

  2 of the movable mounting plate 2, the rollers 4 which slide on their rod are supported by the supports 15, so that the bending deformation of the cylinders due

  their own weight and pressure load when opening the door.

mold, is reduced.

  The supports 9, which are fixed to the ends of the piston rods of the cylinders 4, and which are rigidly connected to the superposed columns 5, receive the signal receivers, for example limit switches. The signal carriers 11, which may each consist of a profile with cam, are mounted on a support 12 fixed to the base frame 1. It is also possible to arrange the signal receiving members 10 stationary and to connect the carriers

  11 with the movable columns 5. Thanks to this

  As a result, when adjusting another tool height by uniform axial sliding of the columns 5 in the movable mounting plate 2, the relative positions of the signal carrier 11 and the signal receiver 10 are retained by relative to the closed position. As a result, a new position setting of the work set

  is not necessary when changing the tool height.

  In addition, thanks to the proposed solution, the signal carrier 11 and the displacement cylinder 4 can be designed and constructed only for the travel of the tool support. it

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  has the advantage that the displacement cylinders can be shorter and smaller diameter, resulting in a significant material saving. With the removal of

  new positioning of the signal carrier, the time required

  the setting for setting up the tool during an exchange is considerably shortened. The solution provided also does not require any additional position adjustment mechanism for making a relative displacement when changing the height of the tools. In the case of an injection molding machine with a force of 630 kg, the displacement stroke can with this solution be

  shortened by about 500 mm. The length of the displacement cylinder

  and the length of the signal carrier are shortened accordingly. According to another exemplary embodiment, represented

  in FIG. 4, the columns 5 'are mounted at each end.

  respectively, in the fixed tool mounting plate 3 ', and in a support plate 13. On the columns 5', and on

  the base frame 1 ', moves the movable plate 2'. The cylinders

  4 'of displacement are supported in the supports 15', by a hinge 6 ', so as to rotate, these supports 15' being rigidly mounted on the fixed plate. The

  piston rods 7 'are connected, via articu-

  8 ', with the threaded spindles 17, on which are provided nuts 18 with toothed rings 19. These nuts 19 are surrounded by bearing shells 20, so that the rotational movements of the nuts 18 are possible independently of the shells 20. The translation movements are, however, transmitted by the nuts 18 on the bearing shells 20 and on the locking devices 21, which

  are connected via spacing sleeves 22, -

  and from there on the movable plate 2 '. In the case of a modification

  tool height, toothed crowns 19 are rotated

  through a chain drive with the crowns

  teeth 23 ', arranged on the four columns 5', in connection

  its with a 14 'combination of nut and column.

  By this rotational movement transmitted on the

  In the case of the nut and the column 14 ', these move on the column thread also by translation, in relation to the columns 5' fixed with respect to the rotation, in common with

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  the movable plate 2 ', so that a change in height of the tool is produced. During this movement, does not change the position of the piston rod or the flounding pin 17 which is connected to it because it is immobilized against rotation by springs 9 'guided on the columns 5'. Thus, the entire displacement of the displacement cylinders 4 'is available exclusively for the opening and closing of the mold tool, and the cylinder can be provided shorter in its course.

and in its diameter.

  The signal receiver 10 'mounted on the support 9' for the displacement path measuring system is connected to the signal carrier 11 ', which is fixed on the support plate 13. This arrangement gives the possibility that, when 'A tool height change, the length of the displacement cylinder and the signal carrier must be provided only according to the displacement stroke of the moving plate for

  the opening and closing of the mold. A training procedure

  additional position geometry for a relative displacement during

  of a change of height of the tool, is not necessary.

  The support of the displacement cylinders 4 'in the articulations 8', 15 'has the effect that no bending stress is transmitted on them during the application.

closing force.

  The operation of the closure system of

  mold according to the invention is as follows. During a change

  of the injection tool, it is necessary to adapt the position of the movable mounting plate 2, 2 'to the height of

  the tool, with the piston rods 7, 7 'outputscdes cylinders.

  For this, the chat wheels 23 are driven through

  27 and the chain wheels 23 'by means of a central wheel 26. From the chain wheels 23 and chain wheels 23' ', the rotational movement is transmitted over the nut / column combinations 14, 14 ', which consist of column nuts, play adjusting nut and pressure ring, which move along the axis of

column on his thread.

  The movable mounting plate is thus moved until it has reached the necessary position. During this positioning process, the position of the piston rods 7, 7 ', and the position of the signal receivers 10, 10', which

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  are stationary relative to the piston rods 7, 7 ',

  remain unchanged. Similarly, the position of the signal carriers 11, 11 ', arranged in a fixed position on the base frame 1, 1' remains unchanged. The cams arranged on the signal carriers 11, 111, by which are triggered, for example, the signals for unlocking or locking the tool, therefore no longer need to be modified in their position when

a tool exchange.

  In the example shown in FIG. 4, the piston rods 7 'of the displacement cylinders are extended by threaded spindles 17. The nuts 18 mounted on these threaded spindles 17 which serve to transmit the forces from the cylinders, on the 2 'movable tool mounting plate, change, during the positioning process their common position with the plate relative to the piston rods 7'. This is obtained

  by the fact that their rotational movement, during a modification

  tool height, is transmitted from the

  toothed rings 23 ', on the ring gear 19, which are fixed on the nuts. The transmission ratio of the gear wheels 23 'and 19 must correspond to the steps of the

  threads on the 5 'columns and on the threaded pins 17.

  The closing movement of the tool takes place by pressure load of the displacement cylinders 4 on the piston rod side. The displacement of the piston rods is transmitted, via the threaded pins 17, the nuts 18, the bearing shells 20, the locking device 21, and

  spacer sleeves 22 on the movable mounting plate 2 '.

  As the two mold tool halves come into contact with each other,

  tact, that is to say, are brought together until a gap of remaining joint, occurs locking. For this, the movable plate 2 'is mechanically connected, via the

  columns 5 ', with the pistons of the closing cylinders 16'.

  In the embodiment according to Figure 1, the locking is effected by a rotational movement of a rod closure member disposed in the fixed plate, and not shown. In the embodiment according to the

  FIG. 4, the locking is effected by the fact that the

  locking jaws 30 are pushed behind the combination

  its nut / column 14 ', as shown.

  When applying pressure that follows on the

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  closing cylinders 16, 16 ', the movable mounting plate 2, 2' is pulled by the columns 5, 5 'towards the fixed plate 3, 3' and the two mold halves are pressed one

  against each other. The injection operation can then begin.

  After the molded blanks have cooled, the mold parts are separated by a pressure load in the opposite direction of the closing rolls. Unlocking occurs and, by displacement of the piston rods in the cylinders 4, 4 ', the mold is opened until the blank can be

levied.

  The signals necessary for the whole of this control in dependence on the displacement strokes are obtained by the fact that the signal receiver 10, 10 'moves along the signal carrier 11, 11' simultaneously with the displacement.

  of the movable plate 2, 2 ', and triggers the communication signals

  tation, when passing over cams and bosses

adjustable in position.

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Claims (1)

CLAIMS) Injection molding machine mold closing apparatus comprising two tool mounting plates, one of which is slidably movable relative to the other, between a closed position and an open position of mold, with two displacement cylinders arranged laterally to the plates, diagonally facing each other on the fixed plate, to bring the plates closer together or separate them from one another, closing cylinders to produce the closing force and holding the mold halves, the signal-carrying members and the signal-receiving members for controlling the technological progress of operation of the closing device, and a device for adjusting the height position of the molding tool, characterized in that the displacement cylinders (4) are mounted in a support (15), with a hinge (6), rigidly connected to the fixed plate (3), the ends of the piston rods (7) being mounted in a hinge (8), provided in a support (9), fixed on columns (5) of the closure and locking system, signal receivers (10) being provided on this support (9), in connection with a signal carrier (11) which is fixed on a support (12) connected to the fixed frame (1). Installation according to Claim 1, characterized in that the piston rods (7 ') are each connected by a hinge (8') to a threaded spindle (17) on which nuts (18) are mounted. provided with worn crowns (19) for adjusting the height position of the molding tool, these nuts (18) being surrounded by bearing shells (20) which are arranged on the locking device (21) and are rigidly connected to the movable plate (2 ') via spacing sleeves (22), a support (9') being vertically attached to the end of each threaded spindle (17), and being supported at sliding in a sleeve (24) on the column (5 ') located above or below, the support (9') having an extension (25) on which the signal receiving member (10 ') while that the signal-carrying member (11 ') is fixed on a support plate (13) in which the columns (5') are supported.   30) Installation according to one of claims 1   2468457 and 2, characterized in that the signal receiving members (10, 10 ') are fixed on the support plate (12 or 13), while the signal carriers (11, 11') are fixed on the support   (9) or the extension (25) of the piston rods.