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
  • B29C45/64—Mould opening, closing or clamping devices
  • B29C45/66—Mould opening, closing or clamping devices mechanical
  • B29C45/661—Mould opening, closing or clamping devices mechanical using a toggle mechanism for mould clamping
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
  • B22D17/20—Accessories: Details
  • B22D17/26—Mechanisms or devices for locking or opening dies
  • B22D17/266—Mechanisms or devices for locking or opening dies hydraulically
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
  • B28B1/00—Producing shaped prefabricated articles from the material
  • B28B1/24—Producing shaped prefabricated articles from the material by injection moulding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
  • B28B7/00—Moulds; Cores; Mandrels
  • B28B7/0002—Auxiliary parts or elements of the mould
  • B28B7/0014—Fastening means for mould parts, e.g. for attaching mould walls on mould tables; Mould clamps
• • 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
  • B29C45/64—Mould opening, closing or clamping devices
  • B29C45/68—Mould opening, closing or clamping devices hydro-mechanical
  • B29C45/681—Mould opening, closing or clamping devices hydro-mechanical using a toggle mechanism as mould clamping device
• • 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
  • B29C45/64—Mould opening, closing or clamping devices
  • B29C45/68—Mould opening, closing or clamping devices hydro-mechanical
  • B29C45/683—Mould opening, closing or clamping devices hydro-mechanical using both a toggle mechanism as mould closing device and another mechanism as mould clamping device

Definitions

• the invention relates to an injection molding machine for processing plastics and other plasticizable materials with at least two toggle mechanisms according to the preamble of the claim.
• EP 0 383 935 A1 which forms the basis for the preamble of claim 1, discloses an injection molding machine with a mold clamping unit, by means of which two toggle mechanisms for regulating the parallelism of form are driven via two separate drive units designed as servomotors.
• the servomotors drive spindles that are in communication with a nut that is mounted to operate the toggle mechanism.
• the drive motors and a Form are fixed so that the moving masses are reduced.
• a mold clamping unit for an injection molding machine is known, to which a double toggle mechanism is driven via a sliding crank.
• the sliding crank and its drive unit are mounted on a rear support element.
• the present invention seeks to further develop an injection molding machine of the type mentioned that the parallelism of the mold carrier can be influenced both in the static and in the dynamic state.
• toggle mechanisms are driven in a known manner by separate drive units or mechanisms, but these drive units are now mounted on a likewise in the toggle movement bearing plate on which the actuators are mounted for the toggle mechanisms.
• this plate moves at the beginning of the movement in about the same ratio as the movable mold carrier, towards the end of the molding movement, however, this bearing plate still moves in the millimeter range, while the mold carriers are already in positive engagement.
• the position of the bearing plate can be used as a reference measure for the tool movement, since the gear ratio is the most accurate at the form fit.
• the bearing plate is guided on the machine base or on the arranged between stationary mold carrier and support force transmission elements such as bars.
• the bearing plate takes on the one hand as a multi-functional part on the drive unit, the engine such. includes a servomotor, but also bearing, nut and spindle, has the bearings for toggle attachment, but also has recordings for guiding the plate.
• the accuracy of the interplay between opening and closing of the injection mold can be influenced by the leadership of the bearing plate relative to the rest of the machine sustainably.
• cooling means for bearing, nut and spindle can be provided on this plate. For example, since this cooling can be integrated into the bearing plate, geometric accuracy for the entire system results, which increases the life of the injection molding machine as well as the precision in the production of injection molded parts.
• FIG. 1 is a three-dimensional side view of a arranged on a machine base mold clamping unit, 2 shows a vertical section through the mold clamping unit of FIG. 1 in the height of the central axis in the extended position of the toggle lever mechanisms with the injection mold closed;
• FIG. 3 shows a representation according to FIG. 2 with the injection mold open
• FIG. 5 is a section along line 5-5 of Fig. 2,
• Fig. 6 is a representation according to FIG. 4 of a further embodiment with on
• Fig. 8 is a partially sectioned view of a drive unit.
• FIG. 1 The figures show in two embodiments, an injection molding machine for processing plastics and other plasticizable materials such as powdery, metallic or ceramic masses, which has a mold closing unit F on a machine base 13 and an injection molding unit, not shown in the drawing, as is customary in an injection molding machine.
• a mold closing unit F on a machine base 13
• an injection molding unit not shown in the drawing, as is customary in an injection molding machine.
• Standing can be taken from several parts.
• At least one toggle combination with two toggle mechanisms K which can be driven individually via separate drive units A, are provided for moving the mold carriers towards each other until the mold closure of the injection mold 10 and the opening movement away from each other for opening the injection mold 10 in the closing direction ss.
• the toggle mechanisms K are mounted on a bearing plate 14, 14 '.
• the drive units are mounted on a bearing plate 14, 14 ', which is moved in the closing direction during the closing movement and the opening movement.
• an analogous design can be provided for more than two toggle mechanisms.
• the toggle mechanism K is at one end articulated on a mold carrier, in the exemplary embodiment on the movable mold carrier 11, and on the other side mounted on a support element 15, wherein the bearing plate 14 is arranged between the mold carrier and the support element.
• a configuration is also conceivable in which the at least two toggle lever mechanisms are mounted on the stationary mold carrier, as shown, for example, in DE 10 2006 061 969 B4.
• the bearing plate between mold carrier and support element.
• FIG. 4 in conjunction with FIG. 2, shows how the drive units A are mounted.
• a bearing 30 is provided for the mounting of the drive unit A on the bearing plate 14.
• the drive unit which in the exemplary embodiment is a servo-electric motor with associated spindle mechanism and has threaded or roller spindles of any design, is provided in the storage area with cooling by cooling channels 29 or in FIG. 6 with a cooling jacket 33.
• hydraulic drive units can also be used as an alternative to the servo-electric drive units, provided that the storage of the drive mechanism takes place in the same way. It is also clear that ensured by the arrangement of the toggle mechanisms short design of the clamping unit. In the first embodiment of FIGS.
• the drive unit is mounted at one end on the bearing plate 14, while the associated drive mechanism, so in the embodiment of the spindle mechanism the other end is mounted on the support member 15, on which the toggle mechanism K is mounted in the embodiment.
• This arrangement is reversed in the embodiment of FIGS. 6 to 8, ie the drive motor is mounted in Fig. 6 on the support member 15 ', while the nut 25 is mounted on the bearing plate 14'.
• the guide of the bearing plate 14, 14 'in the closing direction ss together, once on the machine base 13, once on the power transmission elements 27, whereby a combination of both guides or a guide at another point of the injection molding machine in the closing direction ss is possible.
• a receiving housing 32 is provided in the region of the nut 25, in which the spindle 24 can dip.
• the spindle 24 is driven by the mounted on the bearing plate drive unit A, while the nut 25 is rotatably mounted on the support member 15.
• a reversal of this principle is possible, that is a rotation of the nut and a non-rotatable mounting of the spindle.
• known hollow shaft motors can be used.
• the toggle mechanism K is a five-point toggle in both embodiments.
• an articulated lever 21 is hingedly mounted on one of the two toggle lever 16 of the respective toggle mechanism K, the other end is hinged to the bearing point 23 on the bearing plate 14, 14 '.
• This bearing 23 moves in the closing and opening movement in the closing direction ss, as can be seen from a comparison of Figures 2 and 3.
• the articulated lever 21 is pivoted, which leads to the transfer of the toggle lever out of the position according to FIG. 3 in the extended position according to FIG. 2.
• the toggle levers 16, 17 are stretched substantially in the closing direction ss and the toggle lever joint 18 is located with the Anlenk points 19 on the support member 15 and the articulation point 20 on the movable mold carrier 11 in approximately a line which is parallel to the closing direction ss ,
• a shaping height adjustment device 26 is provided on the supporting element 15, 15 '.
• the height of the injection mold 10 is understood to mean the height of the mold between the movable mold carrier 11 and the stationary mold carrier 12, that is to say the distance between the mold carriers during the positive locking.
• the support element 15 is to be moved in the closing direction s-s by the mold height adjustment device 26 in order to achieve an efficient and energy-saving positive connection with maximum force.
• the support element 15, 15 'itself communicates with the stationary mold carrier 12 via power transmission elements.
• power transmission elements columns or spars 27 are used in the exemplary embodiment, but in principle also power transmission elements can be used, which transmit the forces around the mold clamping around, so that the space between the mold carriers is almost freely accessible.
• bow-like elements are known in the art.
• the bearing plate 14 is mounted on the machine base 13 on guides 28, wherein the accuracy of the interplay between opening and closing is influenced by the leadership of the plate.
• bearings 31 are provided which support the bearing plate 14 on the guides 28.
• the bearings 31 may also be formed so that the spars 27 serve as a guide.
• the bearing plate can be completely pre-assembled as shown in Fig. 4 with their drives as an independent unit and then installed in the machine. This allows testing of the functionality of this assembly prior to connection to the remainder of the injection molding machine.
• the bearing plate is preferably formed in one piece and is insofar a multi-functional part. It not only serves to accommodate the drive unit A with the associated bearings or the spindle 24, it also has bearings 23 for toggle attachment and has receptacles for the guides 28 of the bearing plate 14 on the machine base 13.
• cooling devices such as cooling channels 29 in the Plate or in the second embodiment, a cooling jacket 33 for the bearing of the spindle 24 and to provided direct cooling of the nut 25, whereby the geometric accuracy and the life of the injection molding machine can be increased.
• the cooling devices are provided in particular at the connection points of the drive units A, A 'on the bearing plate 14, 14'. Cooling or temperature control ensures the same temperature at both drive units, so that the temperature-dependent linear expansion is also the same the precision of the entire system continues to increase.
• the position of the bearing plate 14, 14 ' serves as a reference measure for the tool movement, since the transmission ratio is the most accurate at it, especially when form-fitting.
• the parallelism of the mold carrier and thus the parts of the injection mold can also be influenced in the static state. Both in the static state and in the dynamic state, that is to say in the positive-locking movement, it is possible, for example, to regulate the servomotors by means of corresponding position encoders in order to achieve the desired parallelism.
• the paths traveled by the bearing plate 14, 14 'at the beginning of the positive locking movement are approximately identical to the movement of the movable mold carrier 11, but close to the positive locking the bearing plate 14 still moves while the movable mold carrier barely moves.
• the arrangement of motor and nut 25 are reversed compared to the first embodiment.
• the drive unit A 'according to FIG. 8 forms a drive module which can be removed from the bearing plate and essentially comprises the motor, bearing, nut 25 and spindle 24 including the cooling jacket as a structural unit. This is advantageous when e.g. In the case of service, the drive unit is to be changed, since the new unit can then be used as a complete, pre-tested unit.
• the bearing bar 14 'of the second embodiment is formed lattice frame-like, wherein the toggle mechanisms K are arranged within the trained as spars power transmission elements, which serve the bearing plate 14' as a guide on the bearings 31 '.
• the thus possible arrangement of the toggle mechanisms relative to the central axis relatively far on the one hand contributes to the fact that the resulting forces easily intercepted and with less deflection of the bearing plate 14 'can be performed. On the other hand, this simultaneously promotes the open structure of the bearing plate 14 'as a frame structure, which also facilitates access to the components of the mold clamping unit.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Ceramic Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (6)

Families Citing this family (17)

Citations (9)

Family Cites Families (5)

• 2010
  • 2010-10-18 DE DE102010048560A patent/DE102010048560B3/de not_active Expired - Fee Related
• 2011
  • 2011-10-16 JP JP2013533130A patent/JP5826855B2/ja active Active
  • 2011-10-16 CA CA2814890A patent/CA2814890C/en active Active
  • 2011-10-16 WO PCT/EP2011/005190 patent/WO2012052138A1/de not_active Ceased
  • 2011-10-16 EP EP11772890.7A patent/EP2629954B1/de active Active
  • 2011-10-16 US US13/880,129 patent/US8821152B2/en active Active

Patent Citations (9)

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