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
  • 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
  • B29C45/7653—Measuring, controlling or regulating mould clamping forces

Definitions

• the present invention relates to an automatic adjusting device for a mold clamping device in an injection molding machine having a toggle mold clamping device.
• the purpose of the present invention is to automatically obtain an optimal mold clamping force regardless of a human hand when changing a mold or changing a mold clamp.
• the aim is to provide an automatic adjustment device for mold clamping.
• the present invention provides a mold clamping force adjusting device for an injection molding machine having a double mold clamping device.
• a first thermo-motor for moving the laser along the timer, a first position-detecting means for detecting the position of the rare platen, and a flexure / extension of the toggle link.
• a drive current detecting means for detecting a drive current of the thermomotor, and a control means are provided.
• the control means drives the first thermomotor while driving the second thermomotor to maintain the toggle link in an extended state, thereby driving the relay. Advance the brain.
• the drive current value detected by the drive current detection means reaches a specified value.
• the control means further advances the rare platen from the position of the rare platen when the detected drive current value has reached the specified value by a moving amount corresponding to the mold clamping force. Position it at a position where an appropriate mold clamping force can be obtained.
• the position of the trapezoid of the toggle mechanism is automatically adjusted according to the thickness of the mold and according to the set mold clamping force.
• the typer is too thin and the mold is not fully tightened because the elongation of the typer is too small, or the typer is too long and it is damaged. Even if the mold is replaced, constant expansion of the diver is obtained, and the elastic recovery force of the diver allows the die to be tightened at the optimal pressure for molding. As a result, injection molding with high accuracy can be performed with high work efficiency.
• FIG. 1 is an overall configuration diagram showing an automatic clamping device for mold clamping according to an embodiment of the present invention.
• FIG. 2 is a flowchart showing the operation of the device of the embodiment. BEST MODE FOR CARRYING OUT THE INVENTION
• FIG. 1 shows an embodiment of the present invention, in which a first mold 1 is attached to a fixed platen 2 and a second mold 3 is attached to a movable platen 4.
• the fixed platen 2 is provided at one end of a typer 5, and a rare plate 6 is fixed to the other end of the typer 5 so that the fixed position can be changed.
• the lower platen 6 and the movable platen 4 are connected by a toggle mechanism consisting of two sets of toggle links 7 and 8 arranged between the two, and the movable platen 4 is moved. It is provided so as to be driven by the toggle mechanism with respect to the rare platen 6 and to slide over the timer 5.
• a stepped through hole 9 is formed at the center of the rear platen 6, and a first nut 10 and a first gear 13 are rotatably fitted in the large diameter portion of the through hole 9.
• the first nut 10 has a pole screw 1 to which a cross head 11 for bending and stretching the two sets of toggle links 7 and 8 is connected. 2 is screwed.
• the first nut 10 is fixed to the first gear 13 and is provided so as to be able to rotate together with the first gear 13.
• second nuts 15 to be screwed with screws cut at the end of the laser platen 6 on the side of the laser platen 6 are provided.
• a sprocket 16 is provided on the body of the second nut 5, and the second nut 5 is fixed to the rear plate 6 via a support member 17.
• the second nut 15 is to be turned via the socket 16. I have.
• a flange-like protrusion 14 is formed on one side surface of each nut 15, and this flange-like protrusion 4 is formed on the rear plate 6.
• the nut 15 is engaged with the annular groove 14 ′ provided around the through hole for the nut, so that the nut 15 can rotate relative to the rare platen 6.
• the respective nuts 15 rotate, and move on the timer 5 left and right on FIG.
• Reference numeral 21 denotes a first pulse coder provided in the first servomotor 18, which outputs an output pulse of the pulse coder 21 to a first position counter 22. And the position of the rare platen 6 is detected.
• thermomotor 2 for driving, via a shaft 23, a second gear 22 meshing with the first gear 13. 4 are provided.
• the second support motor 2 is provided with a pulse coder 25 for detecting the bending / extension state of the toggle mechanism.
• the output pulse of the pulse coder 25 is counted by a second position counter 27 consisting of a reversible counter 27, and the amount of expansion and contraction of the toggle links 7 and 8 is determined. That is, the position of the movable platen 4 is detected.
• Reference numeral 28 denotes a central processing unit (hereinafter, referred to as a CPU), which controls the injection molding machine.
• CPU central processing unit
• Reference numeral 29 denotes an operation panel, which is used to manually input various setting values such as operation commands and mold clamps.
• Reference numeral 30 denotes a memory which stores a control program for controlling the entire injection molding machine and a moving amount of the rear platen 6 corresponding to the set mold clamping force. This is to remember the pull.
• Reference numeral 35 denotes an input / output circuit, and a CPU 28 controls the first and second servomotors 18, 24 via the input / output circuit 35.
• Drive current detectors respectively connected to the two thermomotor drive circuits 31 and 32 and for detecting the drive current of the first thermomotor 18 33 It is connected to an analog digital converter 34 that converts the output of 3 into a digital signal. 36 is a path.
• the mold clamper adjustment command is input, the CPU 28 sends the second support motor via the input / output circuit 35 and the second support motor drive circuit 32. Drive 24 to extend the toggle links 7 and 8 (step S 1).
• the output pulses from the pulse coder 25 generated as the second support motor 24 rotates are counted by the position counter 27 and specified.
• step S 2 When this value is reached, that is, when the toggle links 7 and 8 reach the specified amount (step S 2), the second servo motor 24 The driving is stopped (step S3), and then the first servomotor 18 is driven via the second thermomotor driving circuit 31 to toggle the state. Link 7, 8 Then, the rear platen 6 and the movable platen 4 move forward at a low speed (to the right in FIG. 1) (step S4).
• the drive current I of the first servomotor 18 is detected by the drive current detector 33, and is converted into a digital signal by the analog digital converter 34.
• the GPU 28 reads the drive current I and determines whether or not the drive current I has reached a specified value (step S5).
• the drive current I for driving the first servomotor 18 increases, so that the drive current I
• the CPU 28 stops driving the first support motor 18 and resets the first position counter 26.
• the second support motor 24 is reversed, and the toggle links 7 and 8 are contracted by a certain amount to open the mold (step S7).
• the first support motor 18 is driven to move the rear platen 6 forward (step S8).
• the GPU 28 reads the value of the first position counter 26 and, at the same time, reads the value of the first position counter 26 into the specified value corresponding to the set type hoof force stored in the table of the memory 30.
• the first thermo-motor 18 is driven until the value of the first position counter reaches. That is, it is determined whether or not the rear platen 6 has moved forward by an amount of movement corresponding to the set mold clamping force (step S9), and the first position counter 26 is set. When the specified value is reached and the rear platen 6 moves forward to a position where an appropriate hoof force can be obtained, the drive of the first servomotor 18 is stopped (step S 10), the mold clamp automatic adjustment process is completed. Finish.
• the position of the lower platen (the value of the first position counter) corresponding to the set mold clamping force is stored in the memory 30 as a table.
• the position of the rear platen is calculated from the set mold clamping force, and step S In step 9, it may be determined whether or not the position of the template has reached a specified value.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=16258694

Family Applications (1)

Country Status (2)

Cited By (2)

Families Citing this family (10)

Citations (6)

Family Cites Families (4)

• 1984
  • 1984-09-13 JP JP19047384A patent/JPS6171164A/ja active Granted
• 1985
  • 1985-09-12 WO PCT/JP1985/000512 patent/WO1986001769A1/ja unknown

Patent Citations (6)

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