EP1423249A2 - Dispositif de serrage electromecanique - Google Patents

Dispositif de serrage electromecanique

Info

Publication number
EP1423249A2
EP1423249A2 EP02704750A EP02704750A EP1423249A2 EP 1423249 A2 EP1423249 A2 EP 1423249A2 EP 02704750 A EP02704750 A EP 02704750A EP 02704750 A EP02704750 A EP 02704750A EP 1423249 A2 EP1423249 A2 EP 1423249A2
Authority
EP
European Patent Office
Prior art keywords
partial
jaw
jaws
clamping device
clamping
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP02704750A
Other languages
German (de)
English (en)
Inventor
Jörg Dantlgraber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Rexroth AG
Original Assignee
Bosch Rexroth AG
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
Priority claimed from DE10146800A external-priority patent/DE10146800A1/de
Application filed by Bosch Rexroth AG filed Critical Bosch Rexroth AG
Publication of EP1423249A2 publication Critical patent/EP1423249A2/fr
Withdrawn legal-status Critical Current

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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/82—Hydraulic or pneumatic circuits
    • 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
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/4005—Ejector constructions; Ejector operating mechanisms
    • 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
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/67—Mould opening, closing or clamping devices hydraulic
    • 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
    • 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
    • B29C2045/1793—Machine parts driven by an electric motor, e.g. electric servomotor by an electric linear motor
    • 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
    • B29C2045/1794—Machine parts driven by an electric motor, e.g. electric servomotor by a rotor or directly coupled electric motor, e.g. using a tubular shaft motor
    • 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
    • B29C2045/685—Mould opening, closing or clamping devices hydro-mechanical using mechanical drive means for mould closing to obtain the hydraulic clamping pressure
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76006—Pressure
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76013—Force
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76033—Electric current or voltage
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76498—Pressure
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76505—Force
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76545—Flow rate
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76568—Position
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76568—Position
    • B29C2945/76581—Position distance
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76655—Location of control
    • B29C2945/76702—Closure or 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76655—Location of control
    • B29C2945/76775—Fluids
    • B29C2945/76785—Fluids hydraulic fluids
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76655—Location of control
    • B29C2945/76792—Auxiliary devices
    • B29C2945/76812—Auxiliary fluid supplying devices
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76929—Controlling method
    • B29C2945/76933—The operating conditions are corrected immediately, during the same phase or cycle
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76929—Controlling method
    • B29C2945/76939—Using stored or historical data sets
    • B29C2945/76943—Using stored or historical data sets compare with thresholds

Definitions

  • the invention relates to an electromechanical clamping device with hydraulic support for a manufacturing machine, in particular for an injection molding machine.
  • the invention is based on an electromechanical clamping device with hydraulic support.
  • Such clamping devices are used for manufacturing machines, for. B. injection molding machines used.
  • the clamping device has two clamping jaws, on each of which a partial shape of a split shape is held.
  • a thrust gear driven by an electric motor moves the jaws against one another along a guide device.
  • the first clamping jaw is divided into two partial jaws, which can be moved against each other in the direction of the guide device.
  • the partial jaws interlock in such a way that a chamber for receiving pressure medium is formed between them.
  • the first partial jaw can be moved along the guide device.
  • the output of the thrust gear engages one of the jaws.
  • the thrust gear pulls a partial jaw while taking the other partial jaw against the second clamping jaw
  • the push gear conveys pressure medium into the chamber between the two partial jaws when the first partial jaw is locked against the guide device.
  • the thrust gear is subjected to tension.
  • the thrust gear on the other hand, stressed. A much greater force is required to tear open the partial molds than for the subsequent pulling apart of the clamping jaws carrying the partial molds.
  • the thrust gear must therefore be dimensioned according to the high force required to tear open the mold.
  • the invention has for its object to provide a clamping device with hydraulic support, in which the thrust gear only needs to be dimensioned according to the force required for the spreading of the jaws, without overloading the thrust gear when tearing the mold.
  • FIG. 1 shows the structure of a first tensioning device according to the invention in a simplified representation
  • Figure 2 shows the structure of a second tensioning device according to the invention in a simplified representation
  • FIG 3 is a block diagram of a controller for the tensioning devices shown in Figures 1 and 2.
  • FIG. 1 shows the structure of a tensioning device according to the invention in a simplified representation.
  • the clamping device has a stationary clamping jaw 11 and a clamping jaw 13 which can be displaced along a guide device 12.
  • the guide device is formed from two bars 12a and 12b, which are provided with a latching division.
  • a latching device 15 only shown schematically, which is controlled by a signal yv 3, engages in a latching of the spar 12a.
  • a further controlled latching device intervenes
  • the clamping jaw 13 is formed from two intermeshing partial jaws 16 and 17 which can be displaced relative to one another in the direction of the guide device 12.
  • the locking device 15 is held on the partial jaw 16.
  • the partial jaws 16 and 17 enclose a chamber 20 for receiving hydraulic pressure medium between them.
  • a form 23 consisting of two partial forms 21 and 22 is held.
  • the first partial form 21 is held on the clamping jaw 11.
  • the other partial shape 22 is held on the partial jaw 17.
  • the electric motor 25 is A speed setpoint n s is supplied as an input variable from a machine control system shown in FIG.
  • the current i ⁇ i absorbed by the electric motor 25 is a measure of the force acting on the push rod 27.
  • the current ⁇ M ⁇ is fed to the control device shown in FIG. 3 as an input signal.
  • the thrust gear 26 converts the rotary movement of the electric motor 25 into a longitudinal movement of the push rod 27, which forms the output of the thrust gear 26.
  • a coupling 28 connects the push rod 27 to the piston 32 of a synchronous cylinder 33 via a piston rod 31.
  • a double-acting cylinder with piston rods on both sides, in which the diameter of the two piston rods can also be of different sizes is referred to here as a synchronous cylinder
  • the piston 32 is connected to a second piston rod 34.
  • the piston rod 34 is immersed in a further chamber 35.
  • the chamber 35 is connected to the rod-side chamber 40 of a differential cylinder 41 via a first check valve 36.
  • the chamber 35 is connected via a Suction valve 42 connected to a tank 43.
  • the differential cylinder the 41 is held on the partial jaw 16. It is connected to the partial jaw 17 via a piston rod 45.
  • the piston of the differential cylinder 41 is provided with the reference symbol 46 and the bottom chamber with the reference symbol 47.
  • a displacement transducer 50 forms the output signal of a displacement sensor 51 which is connected to the piston 46, into an electrical signal xi, which is a measure of the position of the piston 46 and thus also a measure of the distance between the partial jaws 16 and 17.
  • a pressure transducer 52 converts the pressure in the chamber 40 into an electrical signal pi corresponding to it.
  • a hydraulic control device in the form of a proportional valve 53 controls the pressure medium flow from a pump 54 to the differential cylinder 41 and from there to the tank 43 as a function of an actuating signal yvi.
  • a check valve 55 is arranged between the pump 43 and the proportional valve 41.
  • a pressure limiting valve 56 limits the output pressure of the pump 54 in a conventional manner.
  • a hydraulic control device in the form of a switching valve 60 with three switching positions is arranged between the pump 54 and the synchronous cylinder 33.
  • the switching valve 60 controls the pressure medium flow from the pump 54 to the synchronous cylinder 33 and from there to the tank 43 as a function of an actuating signal yv 2.
  • the reference numerals 62, 63 and 64 denote seals.
  • FIG. 3 shows the block diagram of a controller for the upper half of the tensioning device shown in FIG. 1. The components of the lower half of the tensioning device shown in FIG. 1 are controlled in a corresponding manner.
  • the parameters and setpoints required for controlling the workflow of the production machine are stored in a higher-level machine control 70.
  • the machine controller 70 feeds the speed setpoint n s to the electric motor 25.
  • the machine control 70 determines the position of the control piston of the switching valve 60 via the control signal yv 2 and controls the latching device 15 via the control signal yv 3.
  • the machine control 70 supplies an electrical control device 71 with a setpoint value x s for the position of the piston 46, a current -Setwert i ⁇ a for the electric motor 25, one
  • the current target value ir ⁇ a determines the maximum value of the force with which the electric motor 25 presses the push rod 27 against the partial jaw 17.
  • the control device 71 of the tensioning device shown in FIG. 1 is the actual current value ir ⁇ i of the electric motor 25, the actual position value xi of the piston 46 and the actual pressure value pi in the chamber 40 as electrical voltage signals fed.
  • the actual current value ⁇ M ⁇ is a measure of the force with which the electric motor 25 presses the push rod 27 against the partial jaw 17.
  • the actual position value xi of the piston 46 is a measure of the distance between the partial jaws 16 and 17 of the clamping jaw 13.
  • the control device 71 processes these signals into the actuating signal yvi, which is the Position of the control piston of the proportional valve 53 is determined.
  • a difference generator 75 forms a control difference X d i from the current setpoint i Ma and the current actual value ir ⁇ i of the electric motor 25.
  • a differentiator 76 forms the time derivative of the actual pressure value from the actual pressure value pi. To improve the control process, this signal is linked in a computing device 77 to the control difference x ⁇ i and fed to a force controller 78, which forms an actuating signal y K for a force control loop.
  • a difference former 80 forms a control difference X d x from the nominal position value x s and the actual position value xi of the piston 46, which is fed to a position controller 81.
  • the position controller 81 forms a control signal y x for a distance control loop.
  • a switching device 83 with two controlled switches 84, 85 supplies the proportional valve 53 with either the control signal y K , the control signal y x or a constant control signal yvio as the control signal yvi.
  • a comparator 88 switches the changeover switch 84 to the lower position when the current actual value i M i of the electric motor 25 is greater than the threshold value i ⁇ u .
  • the threshold value i Mu is chosen such that it lies between the largest value occurring when the clamping jaw 13 is moved and the value i Ma . If the changeover switch 85 is at the same time in the upper position, the control signal fed to the proportional valve 53 is equal to the control signal y ⁇ and the force control circuit is effective. If the current actual value i M i of the electric motor 25 is less than the threshold value 1 MU , the comparator 88 switches the changeover switch 84 to the upper position. If the changeover switch 85 is in the upper position at the same time, the control signal fed to the proportional valve 53 is equal to the control signal y x and the distance control circle is effective.
  • both the force control circuit and the distance control circuit are interrupted.
  • the control signal supplied to the proportional valve 53 is equal to the constant control signal Yvi O which is selected such that the control piston of the proportional valve 53 is in a neutral position, in this case in the middle position. In this position, the chambers 40 and 47 of the differential cylinder 41 are throttled together, connected to the pump 54 and to the tank 43.
  • the thrust gear 26 pulls the partial jaw 17 coupled to it against the stationary clamping jaw 11 in a first step.
  • the partial jaw 17 takes the partial jaw 16 with it. Since, when moving the partial jaws 16 and 17, the current i ⁇ i consumed by the electric motor 25 is less than the threshold value ir ⁇ u, the control signal y x is fed to the proportional valve 53 and the distance control circuit, which configures the distance between the partial jaws 16 and 17 - keeping steady is effective.
  • the piston 32 of the synchronous cylinder 33 lies against the right stop, but it can also be clamped in an intermediate position. If the partial jaw 17 has reached the clamping jaw 11, the machine control 70 locks the latching device 15.
  • the machine control 70 switches the control piston of the switching valve 60 into the position in which the right-hand chamber, designated by the reference number 92, of the synchronous cylinder 33 is connected to the chamber 20 , If the electric motor 25 now pulls the piston 32 further in the closing direction in a second step, the chamber 92 becomes displaced medium into the chamber 20 and the partial jaw 17 is pressed against the jaw 11.
  • the area ratios of the pressurized areas are selected so that the force exerted by the electric motor 25 on the piston 32 is increased. In this step, the push rod 27 is subjected to tension.
  • the push rod 27 can be subjected to a greater force when subjected to a tensile load than is permissible in the case of a pressurization, a limitation of the tensile force exerted by the electric motor 25 on the push rod 27 is not necessary.
  • the clamping device is also opened in two steps.
  • the locking device 15 remains locked.
  • the control piston of the switching valve 60 is switched to a position in which the chamber 20 is relieved to the tank 43.
  • the force required to open the mold 23 is greater than the force which the push rod 27 can transmit when pressurized without bending inadmissibly.
  • the current i ⁇ i consumed by the electric motor 25 increases to a value which is greater than the threshold value iu.
  • the comparator 88 therefore switches the changeover switch 84 to the lower position in which the force control loop is active.
  • the pump 54 acts on the chamber 40 with pressure medium and thereby supports the force acting in the opening direction.
  • the force regulator 78 controls the proportional valve 53 such that the current i M i consumed by the electric motor 25 is equal to the threshold value i Ma .
  • pressure medium displaced from the chamber 35 and fed to the chamber 40 via the check valve 36 supports the tearing open of the mold 23. If the mold 23 is torn open, the machine unlocks Control 70 for the second step of the opening process, the latching device 15.
  • the current i M i taken up by the electric motor 25 when the clamping jaw 13 moves in the opening direction is smaller than the threshold value i M u.
  • the comparator 88 thus switches the changeover switch 84 back into the upper one Position, ie from force control to distance control.
  • the control valve yvio can be fed to the proportional valve 53 during the second step of the opening process, which switches the control piston of the proportional valve 53 into the middle position.
  • FIG. 2 shows the structure of a second tensioning device according to the invention in a schematic representation.
  • the essential parts of this tensioning device correspond to the tensioning device shown in FIG.
  • the same components are therefore provided with the same reference numerals as in FIG. 1.
  • the clamping device shown in FIG. 2 also has a stationary clamping jaw 11 and a clamping jaw 13 formed from two partial jaws 16 and 17 and displaceable along a guide device 12.
  • the guide device 12 is constructed in the same way as in FIG. 1.
  • a chamber 20 for receiving hydraulic pressure medium is formed between the partial jaws 16 and 17.
  • Two partial molds 21 and 22 of a mold 23 are held on the partial jaws 16 and 17.
  • a differential cylinder 95 is held on the partial jaw 17.
  • a piston 97 connected to a piston rod 96 divides the differential cylinder 95 into a rod-side chamber 98 and a bottom-side chamber 99.
  • An electric motor 25 is held on the stationary clamping jaw 11.
  • a thrust gear 26 forms the rotary movement of the Electric motor 25 in a longitudinal movement of the push rod 27, which transmits a clutch 28 to the piston rod 96 of the differential cylinder 95.
  • a switching valve 60 connects the chamber 98 in a first position to a pump 54 and in a second position to the chamber 20. In the middle position of the switching valve 60, both the chamber 98 and Chamber 20 closed off.
  • a 2-way switching valve can be used if the middle position of the switching valve 60 is not required.
  • the chamber 99 is constantly connected to the tank 43 regardless of the position of the switching valve 60.
  • a differential cylinder 41 is held on the partial jaw 16, the piston rod 45 of which is connected to the partial jaw 17.
  • the proportional valve 53 controls the
  • the components provided with an * are provided, as described in connection with FIG. 1, in order to apply a uniform force to the partial jaw 17.
  • the tensioning device shown in FIG. 2 is controlled in the same way as the tensioning device shown in FIG. 1 is controlled by the electrical control device 71 shown in FIG. 3 in conjunction with the superordinate machine control 70.
  • the control device 71 receives from that in the figure 2, the actual clamping value xi of the piston 46, the actual pressure value pi in the chamber 40 and the actual current value i M i of the electric motor 25.
  • the clamping device shown in FIG. The device receives from the control device 71 the control signal yvi for the proportional 53 and from the machine control 70 the control signal yv 2 for the switching valve 60, the control signal yv 3 for the locking device 15 and the speed setpoint n s for the electric motor 25. Die
  • the individual signals are linked in the same way as described above in connection with the control of the tensioning device shown in FIG. 1.
  • the force acting on the push rod 27 can - as described above - from that absorbed by the electric motor 25

Abstract

L'invention concerne un dispositif de serrage électromécanique à assistance hydraulique. Un entraînement coulissant à moteur électrique déplace deux mâchoires de serrage l'une contre l'autre dans un guide. Une des mâchoires de serrage est divisée en deux mâchoires partielles pouvant coulisser l'une contre l'autre. Une chambre destinée à la réception d'un milieu de pression est formée entre les mâchoires partielles. La première mâchoire partielle peut coulisser dans le guide et être bloquée par rapport à ce dernier. Une mâchoire partielle comporte un premier cylindre couplé à la sortie de l'entraînement coulissant. Pour la fermeture du dispositif de serrage, l'entraînement coulissant tire dans un premier temps les mâchoires partielles contre l'autre mâchoire de serrage, et refoule dans un deuxième temps du milieu de pression du premier cylindre dans la chambre située entre les deux mâchoires partielles, lorsque la première mâchoire partielle est bloquée par rapport au guide. Pour l'ouverture du dispositif de serrage, un deuxième cylindre disposé entre les deux mâchoires partielles tire dans un premier temps les deux mâchoires partielles l'une contre l'autre, lorsque la première mâchoire partielle est bloquée par rapport au guide, puis l'entraînement coulissant pousse dans un deuxième temps la mâchoire partielle à laquelle ce dernier est couplé, avec entraînement de l'autre mâchoire partielle dans le sens d'ouverture, lorsque la première mâchoire partielle est débloquée par rapport au guide. Le dispositif de serrage selon l'invention est destiné à des machines de production telles que des machines de moulage par injection.
EP02704750A 2001-03-21 2002-03-13 Dispositif de serrage electromecanique Withdrawn EP1423249A2 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE10113808 2001-03-21
DE10113808 2001-03-21
DE10118823 2001-04-17
DE10118823 2001-04-17
DE10146800 2001-09-22
DE10146800A DE10146800A1 (de) 2001-03-21 2001-09-22 Elektromechanische Spannvorrichtung
PCT/EP2002/002727 WO2002076703A2 (fr) 2001-03-21 2002-03-13 Dispositif de serrage electromecanique

Publications (1)

Publication Number Publication Date
EP1423249A2 true EP1423249A2 (fr) 2004-06-02

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Application Number Title Priority Date Filing Date
EP02704750A Withdrawn EP1423249A2 (fr) 2001-03-21 2002-03-13 Dispositif de serrage electromecanique

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US (1) US6884057B2 (fr)
EP (1) EP1423249A2 (fr)
WO (1) WO2002076703A2 (fr)

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JP2005104071A (ja) * 2003-10-01 2005-04-21 Toyota Motor Corp 成形装置および専用型の段替方法
EP1677963A1 (fr) * 2003-10-30 2006-07-12 Bosch Rexroth AG Unite de commande
DE102004027279B4 (de) * 2004-06-04 2012-10-04 Bosch Rexroth Ag Antriebseinheit für eine Spritzgieß- oder Spritzprägemaschine
US8594704B2 (en) * 2004-12-16 2013-11-26 Atc Technologies, Llc Location-based broadcast messaging for radioterminal users
KR100774327B1 (ko) * 2006-06-07 2007-11-08 현대자동차주식회사 트랜스퍼 프레스 장치 및 그 작동방법
US7484954B2 (en) * 2006-06-13 2009-02-03 Husky Injection Molding Systems Ltd. Molding-system locking mechanism
US20080207075A1 (en) * 2007-02-22 2008-08-28 Siemens Power Generation, Inc. Optimized fabric lay-up for improved ceramic matrix composites
CA2607397A1 (fr) * 2007-10-23 2009-04-23 Husky Injection Molding Systems Ltd. Ejecteur pour l'ejection de piece hors d'un moule
US9676126B2 (en) * 2013-12-16 2017-06-13 Lockheed Martin Corporation Open-face molding
CN108099079A (zh) * 2018-01-18 2018-06-01 李江平 一种搪胶工艺拔模全自动系统
CN108407227B (zh) * 2018-03-14 2024-03-12 江苏星科精密模具有限公司 一种高位刹车灯模具和注塑机及其工作方法
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Also Published As

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US20040081722A1 (en) 2004-04-29
WO2002076703A2 (fr) 2002-10-03
US6884057B2 (en) 2005-04-26
WO2002076703A3 (fr) 2004-03-11

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