SE424704B - TOOL CONNECTOR UNIT FOR A INJECTION MACHINE - Google Patents

Description

7805293-3 regulation in the closing position takes place through separate work devices. Thereafter, the closing and restraining force is generated by high-pressure cylinders with a small stroke. In this case, the interlocking system provides in each case a restriction of the force flow during the application of the closing and retaining force and a connection to the force-transmitting elements and the piston-cylinder systems with a short stroke for generating the closing and retaining force. German Offenlegungsschrift No. 1,245,105 and East German Pat. No. 122,667 disclose mold closure and mold retaining devices in an injection molding machine, where cantilevered pillars are arranged on a machine bearing acting as a stationary mold carrier plate. In the closed position, the mold carrier plates are interlocked by separate interlocking devices. This is done according to German Offenlegungsschrift 1 245 105 with the aid of sleeves, which are provided with inner claws made in the form of ring sections. The support plates are interlocked in such a way that the sleeves are guided by piston rods belonging to each hydraulic cylinder. The head of the hydraulic cylinder is arranged to pivot about a bolt, so that the piston rod can follow the arc on which the sleeve of the sleeve moves. According to the East German patent specification 122 667, locking slides driven by means of a piston-cylinder system are provided for realizing the closing and retaining force and the associated prior locking at the movable tool clamping plate. 7 In this case, the pillars arranged at the stationary tool clamping plate located on the nozzle side are moved so in connection with the movable tool clamping plate over a displacement distance on the machine bed that they can be releasably locked in the connecting ring of the pillars in each case. . The interlocking slides are operated by four separately arranged piston-cylinder systems for interlocking in vertical direction with the column ends provided with a counter-profile.

The East German patent specification 79 378 discloses a tool connection unit which has columns extending continuously over the entire length of the tool connection unit, which are stored in a support plate and in the fixed tool clamping plate located on the nozzle side. The interlocking device is formed by an adjusting nut provided with a flange and connected to the columns, which constitutes the stroke limitation and control of the interlocking elements during the generation of the closing force, by a pair of interlocking elements, a guide housing and each sleeve, which connect interlocking and the tool height adjustment device with the movable tool clamping plate located on the extruction side and which encloses the shaft without contact.

The interlocking of the columns with the movable tool clamping plate located on the extrusion side takes place by means of an adjusting nut provided with a flange height-adjusting drive device and the interlocking elements engaging therein.

An injection molding machine with the same working principle is known from German Offenlegungsschrift No. 1,230,554, which also requires separate actuators for the interlocking process. In this case, the pillars are interlocked with the movable tool clamping plate located on the squeezing side through pairs of clamping jaws maneuvered by means of piston-cylinder systems. The clamping jaw pair then engages in insertion holes in the columns and interlocks them with the movable tool clamping plate.

All the above-mentioned interlocking systems have the following common disadvantages. They require the use of additional actuators for the interlocking process, for example piston-cylinder systems or mechanical operation by means of an electric motor.

This entails higher costs for the operation and regulation of the interlocking slides and thus increased sensitivity to interference with the interlocking device.

In addition, the work processes that involve a merging of the tool clamping plate to the closing position and the subsequent interlocking and the reversing process proceed asynchronously.

The reason for this is that the said work processes take place in different work planes (horizontal, vertical). This results in a division of working time into time and thus an additional increase in control and maneuvering time as well as a greater total working time of the machine.

The object of the invention is to provide, by reducing the technical complication, a closing unit for an injection molding machine with interlocking elements of this design, by which a shortening of the control and operating time is achieved and consequently a reduction of the total working time of injection molding machine. The task solved by the invention consists in particular in performing the tool connection unit in an injection molding machine in such a way that the closing force generating and transmitting elements constitute a functional unit, that the closing and interlocking process and the locking and opening process for the two tool clamp clamps synchronously through a maneuvering element in a work pace and that after the interlocking a continuous transition can occur towards the structure of the closing and restraining force. According to the invention, the object is solved in that the interlocking elements are translationally and rotationally forcibly controlled, that as interlocking elements serve either pillars which extend over the entire length of the tool closing unit and which are stored in a support plate and in the fixed tool clamping plate or clamping bushings. fixed tool clamping plate, that guide tracks are incorporated on the surface of the columns or on the circumferential surface of the clamping bushings and that for co-operation with these guide tracks guide pins are arranged in the fixed tool clamping plate, on the one hand ring-sectionally arranged inner claws acts with a washer to an annular flange in a rotatable and non-displaceable bushing connected to the pillars or on the other hand abutment surfaces on the columns cooperate with inner abutment surfaces the bushings. 7 'When using the technical solution according to the invention of a tool closing unit in the embodiment with three plates, the columns are rotatably mounted in the support plate and axially locked by safety elements, wherein in the movable tool clamping plate rings are fixedly provided, which are provided with inner claws that cooperate with the bushings arranged on the pillars. Furthermore, the bushings on the side thereof facing the tool clamping space, opposite the annular flange, have a further ledge in the form of an annular flange on which annular section-shaped outer claws are located with intermediate recesses through which the inner claws pass during the closing process. , and guide pins are arranged in the fixed tool clamping plate which guide pins slide in the guide path so that the pillars are movable in axial direction with the length of the closing stroke and in radial direction around the point of rotation for interlocking the outer claws with the inner * claws.

The transfer of movement on the pillars acting as interlocking elements takes place in such a way that the inner claws, which are arranged on the ring fixedly locked in the movable tool clamping plate, are connected to a shim. This shim is located on a flat parallel annular surface of a flange, which is arranged on the bushing rotatably connected to the columns.

When using the solution according to the invention of a construction with two plates, the pillars, which are axially adjustable and rotatably mounted in the movable tool clamping plate, are provided at the ends inserted in the stationary tool clamping plate with outer claws which penetrate into clamping bushings during the closing process. in the stationary tool clamping plate, the clamping bushings on the inside having axially extending grooves, which are interrupted by annular channels, whereby inner claws are formed, and at the outer circumference guide clamps guide tracks are arranged in which guide pins slide so that the clamping bushings are movable axially with the length of the closing stroke and radially with the angle of rotation for interlocking the outer claws with the inner claws. In this case, movement is transmitted to the clamping bushings acting as interlocking elements in such a way that the outer end surfaces of the clamping bushings are in communication with ring surfaces on the columns or inner end surfaces of the clamping bushings are connected to the end surfaces of outer claws attached to the columns. To ensure a lubrication of the guide ridge cam system, sealing elements opposite the closing cylinder are first arranged in front of the axially extending section of the guide ridge on the tool side at the fixed tool mounting clamp plate, which ends in front of the outer circumference of the clamping bushings or columns.

The invention will be explained in more detail below in connection with two embodiments with reference to the drawings.

Fig. 1 shows a closing unit with continuous columns stored in an additional support plate.

Fig. 2 is a section of the functional elements along the sectional plane B-B in Fig. 1.

Fig. 3 shows the section C-C according to Fig. 2.

Fig. 4 shows a closing unit with two tool clamping plates and cantilevered supported columns.

Fig. 5 is a section of the functional elements along the plane A-A in Fig. 4. Fig. 6 is a view along the arrow Y according to Fig. 5.

Fig. 7 is a view along the arrow Z in Fig. 5.

Figs. 1, 2 and 3 show the application of the inventive idea of an embodiment with through-going columns 5 stored in an additional support plate 22. The movable tool clamping plate 2 is arranged to be displaced on a bottom frame 1 by means of a advancing cylinder 4. The pillars 5 are rotatably mounted in the support plate 22 and axially secured against displacement by securing rings. They slide all the way into the stationary tool clamping plate 3 located on the nozzle side, where they are mounted with forced control in such a way that they form a functional unit together with the closing piston 12. In each column 5 a bushing 23 is arranged, the position can be adjusted in accordance with the required tool installation height by means of column nuts 25. The bushings 23 are rotatably connected to the columns 5 by axially displaceable pins 32 in column grooves 26. The ends of the bushings 23 which point in the closing direction are provided with double flanges 24, 29. The flanges 24 have outer claws 11 in the form of ring sections and the flanges 29 arranged in a connecting direction have a plane-parallel ring surface with an associated washer 28.

On the surface facing away from the tool side of the movable tool clamping plate 2, rings 27 with ring-section-shaped inner claws 6 are fastened at the passage openings for the columns 5.

The ring-section-shaped inner claws 6 have such a shape that they can be passed unhindered through the recesses_30 in the flanges 24 between which ring-section-shaped outer claws 11 are arranged. . 7 At the stationary tool clamping plate 3 arranged on the nozzle side, the columns 5 effecting the interlocking process are forcibly controlled. Guide tracks 16 and the guide pins 17 arranged therewith arranged on the pillars 5 determine the angle of rotation of these forcibly controlled interlocking elements during simultaneous axial movement in the closing direction and vice versa. 7805293-3 The guide tracks 16 have a section 8 inclined in relation to the closing direction for achieving the rotational movement during the interlocking and releasing process. This oblique section is joined by a straight section 7, which is necessary for the type of closing and tearing.

The sealing elements 21 between the columns 5 and the fixed tool clamping plate 3 for sealing against the pressure medium 15 are arranged in front of the section 7 axially extending on the columns 5 on the guide tracks 16 on the tool side of the stationary tool clamping plate 3.

The mode of operation of the embodiment according to Figs. 1, 2 and 3 is briefly described below. In the opening position for removing the mold parts, the movable tool clamping plate 2 and the stationary tool clamping plate 3 are at a maximum distance. If now the tool closing unit is to be closed again for a subsequent injection molding process, pressure is applied to the advancing cylinders, whereby the movable tool clamping plate 2 is moved in the closing direction. In this case, the ring-shaped inner claws 6, which are arranged at the ring 27 fixedly connected to the movable tool clamping plate 2, move through the recesses 30 between the outer claws 11 coordinated with the flange 24, until they come into contact with their end surface with the shim 28 on the connecting flange 29. Now the translational movement generated by the advancing cylinders 4 and the associated movable tool clamping plate 2 is transmitted on the bushings 23 and thus on the pillars 5. g The pillars 5 are forcibly guided in the stationary tool clamping plate 3 with fixed locked guide pins 17 in cooperation with the guide tracks 16 arranged on the columns 5 effect a rotation of the columns 5 with a rotational angle predetermined by the shape of the guide tracks 16 during simultaneous axial movement. In this case, the inner claws 6 and the outer claws 11 come into abutment against each other, whereby the movable tool clamping plate 2 is locked in a mold connection in a one-way working rhythm with the fixed tool clamping plate 3. This means that no additional working devices are required for the interlocking process. the working speed of the interlock is achieved simultaneously with the movement of the movable tool clamping plate 2 to the closing position by the translationally movable working direction of the advancing cylinders 4. The assembly of the movable tool clamping plate 2 to the closing position and the simultaneous interlocking is possible acting as interlocking elements, forcibly guided the pillars 5 during a superposition of rotating and translational movement. "" After this interlocking in the mold connection, the two tool clamping plates are closed as if at a short distance corresponding to the tearing stroke. , which forms a functional unit together with the columns 5, in order to be held together with the required restraining force in connection with the construction of a high pressure in the closing cylinder 31.

After the injection molding process and the cooling of the sprayed blank, pressure is applied to the closing cylinders 31 in the opposite direction, until the two tool halves 33 are moved apart in accordance with the tearing stroke. During the closing and tearing stroke, the guide pin 17 slides in the axially extending section of the guide track 16. Now the complete opening of the tool closing unit takes place after the previous release of the interlock - also without intermediate work stroke division in the opposite direction through the advancing cylinders 4 and for removing the mold part. Figures 4, 5, 6 and 7 illustrate the use of the technical solution according to the invention of a two-plate closing unit with cantilevered supported columns. 7 The movable tool clamping plate 2 'is displaced on the frame 1' by means of the advance cylinders 4 '. In the movable tool clamping plate 2 'are the columns 5 designed as clamping bolts? for adaptation to the tool installation height by column nuts 25 'adjustable in the longitudinal direction. These pillars 5 'formed as clamping bolts have suitable ring-section-shaped outer claws 6' at their ends facing the tool clamping plate 3 'arranged on the nozzle side. The columns 5 'are also secured against rotation by a cross wedge 24, which is axially displaceable in a groove 35 in a bushing 34. The bushing 34 is 7805293-3 fixedly connected to the movable tool clamping plate 2 '. In the stationary tool clamping plate 3 arranged on the nozzle side, the clamping bushings 9 provided by the interlocking process are forcibly steerably mounted. These clamping bushings 9 have axially extending grooves 10 on the inside, which are interrupted by annular channels 18.

As a result, inner claws 11 'are formed in the clamping bushings 9. At the outer circumference of the clamping bushing rings 9, guide tracks 16' are arranged, which are in engagement with the guide pin 17 'arranged on the stationary tool clamping plate.

The guide tracks 16 'are formed by an axially extending section 7' and an adjoining, obliquely extending section 8 '. To ensure a movement transfer from the movable tool clamping plate 2 'on the clamping bushings 9, the clamping bushings 9 on the outside have abutment surfaces 14, which are connected to the annular surfaces 13 of the columns 5', or have the inner abutment surfaces 20, which are connected to the columns 5 abutment surfaces 19. Sealing elements 21 'between the clamping bushings 9 and the stationary tool clamping plate 3' for sealing against the pressure medium 15 'are arranged in front of the section 7' of the guide tracks 16 'extending axially on the tool side. This has the advantage that the guide tracks 16 'for the guide pins 17' are lubricated by the leakage oil present. The clamping bushings 9 and the closing pistons 12 'together form a functional unit. The mode of action of the construction proposed according to the invention is described below briefly.

In the opening position due to mold part removal, the movable tool clamping plate 2 'and the stationary tool clamping plate 3' are moved to the greatest possible distance from each other. When the tool closing unit is now to be closed again for a new injection molding process, pressure is applied to the advance cylinders 4 ', whereby the tool clamping plate 2' with the columns 5 'attached thereby is moved in the direction of the stationary tool clamping plate 3'. As a result, the outer claws 6 'which are arranged at the ends of the columns 5' entering the stationary tool clamping plate penetrate into the clamping bushings 9.

The outer claws 6 'then move along the grooves 10 axially extending in the clamping bush 9, which are interrupted by annular channels 18, whereby inner claws 11' are formed. The clamping bushing 9 is forcibly guided mounted in the stationary tool clamping plate 3 'by means of a guide track 16' arranged on the outer circumference and a guide pin 17 'engaging therein and is radially displaceable over a rotational angle predetermined by the shape of the guide tracks 16' at simultaneous axial movement. The outer claws 6 'enter during the advancing stroke the closing position so far into the clamping bushings 9 until the ring surfaces 13 on the columns 5' come into contact with the outer abutment surfaces 14 on the clamping bushings 9 'or the abutment surfaces 19 on the columns 5' come into contact with the inner clamping bushings 9 abutment surfaces 20. The translational movement generated by the advancing cylinders 4 'and the associated movable tool clamping plate 2' is now transmitted to the forcibly controlled clamping bushings 9. The clamping bushings 9 are moved radially over the angle of rotation to lock the outer claws 6 '. 11 ', while the guide pins 17' slide in the inclined section 8 of the guide tracks 16 '. The movable tool clamping plate 2 'will thus, in a working stroke synchronous with the advance stroke to the closing position, be locked in a mold connection with the stationary tool clamping plate 3'. This means that no additional working devices are required for the interlocking process, since the working rate of the interlocking is simultaneously achieved by the translationally advanced working device of the advancing cylinders 4 'when bringing together the movable tool clamping plate 2' to the closing position.

The joining of the movable tool clamping plate 2 'to the closing position and the simultaneous interlocking is made possible in this case by the forcibly controlled clamping bushings 9 acting as interlocking elements during a superposition of rotating and translational movement. After this interlocking in the mold connection, the two tool clamping plates 2 ', 3' are closed except at a small distance corresponding to the tear-off stroke. After the interlocking, a small pressure build-up in the closing cylinders 31 'now takes place without intervening work rate division, and the two tool halves 33' are closed damped by the closing pistons 12 'cooperating with the clamping bushings 9 in a functional unit, in order to be held together by in the closing cylinders 31 with the necessary restraining force. After the spraying process and the cooling of the spray blank, pressure is applied to the closing cylinders 31 'in the opposite direction, until the two tool halves 33' are separated from each other in correspondence to the tearing stroke.

During the closing and tearing stroke, the guide pin 17 'slides in the axially extending 7' in the guide tracks 16 arranged on the clamping bushings 9.

Now the complete opening of the tool connection unit occurs after the previous release of the interlock, also without intervening work stroke division, in the opposite direction to the closing position through the advance cylinders 4 'for removing the mold part.

Claims (5)

vsoszàs-s h lay Patent Claims Tool closure unit for an injection molding machine with a movable tool clamping plate (2 or 2 ') and a stationary tool clamping plate (3 or 3') with a working device consisting of advance cylinders (4 or 4 ') which provide the displacement of the movable the tool clamping plate (2 or 2 ') in and For interlocking in the closing position resp. at the release to the opening position, and with a working device consisting of closing cylinders (31 or 31 ') for generating the closing and retaining force, the locking element * acting for the transmission of the closing and retaining force, characterized in that the interlocking elements are translationally and rotationally forcibly controlled, that as interlocking. elements serve either pillars (5) extending over the entire length of the tool closure unit and stored in a support plate (22) and in the fixed tool clamping plate (3) or clamping bushings (9) stored in the fixed tool clamping plate ( 3 '), that guide tracks (15 or 16') are incorporated on the surface of the columns (5) (or on the circumferential surface of the clamping bushings (9) and that for cooperation with these guide tracks guide pins (17 or 17 ') are arranged in the fixed tool clamping plate (3). or 3 ') wherein on the one hand annular section (6) arranged in an annular section (6) to a ring (27) fixedly connected to the movable tool clamping plate (2) cooperates with a shim (27) to form an annular flange (22) in a rotating fixed and non-displaceable bushing (23) connected to the pillars (5) or on the other hand abutment surfaces (19) on the pillars (5 ') cooperate with inner abutment surfaces (20) on the clamping bushings (9) or abutment surfaces (13) on the pillars (S') interacts with external abutment surfaces (14) on tension b ussningarna (9). _ “ Tool locking unit according to claim 1, characterized in that the guide tracks (16, 16 ') consist of an axially extending section (7, 7') and an adjoining, obliquely extending section (a, 2 :-) . i '1 Tool locking unit according to claims 1 and 2, characterized in that the pillars (S) are rotatably mounted in the support slat (22) and are axially locked through safety elements (36), that in the movable tool clamping plate (2) rings (27) ) are fixedly arranged, which are provided with inner members = (6) which cooperate with the bushing (5) fixedly arranged on the walking pillars (5), that the bushings (23) on the side thereof facing the tool clamping space , Opposite the annular flange (29) has a further, ledge in the form of an annular flange (24) on which annular section-shaped outer claws (11) are located - with recesses (30) lying therebetween through which the inner claws (6) pass during the closing process, that guide pins (17) are arranged in the fixed tool clamping plate (3) which guide pins slide in the guide path (16) so that the columns (5) are movable in axial direction with the length of the closing stroke and in radial direction around the pivot point For interlocking vtter the claws (11) with the inner claws (6). Tool closure unit according to claim 1, characterized in that the columns (5), which are axially adjustable and rotatably mounted in the movable tool clamping plate (2 '), at the ends inserted in the stationary tool clamping plate _ (3') are provided with outer claws (6 ') which during the closing process penetrate into clamping bushings (9), arranged in the stationary tool clamping plate (3'), that the clamping bushings (9) when the inside have axially extending grooves (10), which are interrupted through annular channels (18), whereby inner claws (11 ') are formed, that at the outer circumference of the clamping bushings (9) guide tracks (16') are arranged in which guide pins (17 ') slide so that the clamping bushings (9) are movable axially with the length of the closing stroke. and radially with the angle of rotation For locking the outer claws (6 ') with the inner claws (11'). Tool closure unit according to one or more of the preceding claims, characterized in that on the columns (5) or on the clamping bushings (9) are in each case in front of the sections (7. 7 ') axially extending on the tool side (16 7') , 16 ') sealing elements (21, 21') arranged. WHY PUBLICATIONS: