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Injection mold and control system and method for controlling mold cavity pressure

An injection mold and control system technology, applied in the field of injection mold cavity pressure control, can solve the problem that the pressure uniformity of the last filled area of ​​the melt and the melt filled area cannot be guaranteed, and achieve uniform cavity pressure control and stable air pressure. And accurate, to achieve the effect of multi-level adjustment

Active Publication Date: 2018-05-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology has designed two sets of gas pipelines in the injection mold, one of them is only used for the gas discharge at the last filling position of the melt in the cavity, and does not involve the control method of the gas discharge process, and still cannot guarantee the final flow of the melt. Pressure uniformity in the filled area versus the melt-filled area

Method used

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  • Injection mold and control system and method for controlling mold cavity pressure
  • Injection mold and control system and method for controlling mold cavity pressure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The working process of the gas back pressure assisted injection molding process is:

[0067] Step (1), before the device starts to work, open the second manual shut-off valve 4, close the first manual shut-off valve 3, when the pressure booster 2 raises the pressure of the nitrogen source 1 to a certain value within the range of 15-20 MPa , the PLC module 29 sends signals to all solenoid valves and vacuum pumps to close all pneumatic shut-off valves and vacuum pumps.

[0068] In step (2), the PLC module 29 receives the mold clamping end signal from the injection molding machine control system 32 , sends a signal to the second solenoid valve 26 , and opens the second pneumatic shut-off valve 8 . The high-pressure gas flows out from the pressurization device 2, passes through the second manual stop valve 4, the second air-operated pressure reducing valve 6, the second pneumatic stop valve 8, the second pressure gauge 12, and the second filter 14, and enters the edge of th...

Embodiment 2

[0072] Embodiment 2: The working process of the external gas-assisted injection molding process is:

[0073] Step (1), before the device starts to work, open the first manual shut-off valve 3, close the second manual shut-off valve 4, when the pressure booster 2 raises the pressure of the nitrogen source 1 to a certain value within the range of 15-30MPa , the PLC module 29 sends signals to all solenoid valves and vacuum pumps to close all pneumatic shut-off valves and vacuum pumps.

[0074] In step (2), the PLC module 29 receives the signal of injection completion from the injection molding machine control system 32, sends signals to the first solenoid valve 25 and the fourth solenoid valve 28, and opens the first pneumatic shut-off valve 7 and the fourth pneumatic shut-off valve 10 . The high-pressure gas flows out from the pressurization device 2, passes through the first manual stop valve 3, the first air-operated pressure reducing valve 5, the first pneumatic stop valve 7,...

Embodiment 3

[0079] The working process of the short-shot microcellular foaming injection molding process is:

[0080] Step (1), before the device starts to work, open the first manual shut-off valve 3 and the second manual shut-off valve 4, when the pressurization device 2 raises the pressure of the nitrogen source 1 to a certain value within the range of 15-30MPa, The PLC module 29 sends signals to all solenoid valves and vacuum pumps to close all pneumatic stop valves and vacuum pumps.

[0081] In step (2), the PLC module 29 receives the signal from the control system 32 of the injection molding machine that mold closing is completed, sends signals to the first solenoid valve 25 and the second solenoid valve 26, and opens the first pneumatic shut-off valve 7 and the second pneumatic shut-off valve 8 . The high-pressure gas flows out from the booster device 2 and enters the mold cavity 47 in two ways. All the way through the first manual cut-off valve 3, the first air-controlled pressur...

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Abstract

The invention discloses an injection mold and a control system and method for controlling the pressure of a mold cavity.Two sets of gas channels in the mold achieve independent closed-loop control, one set of the gas channel connects the edge, the filling tail end and the rib column tail end of the injection mold cavity with an external gas control device, and the other set of the gas channel connects the side wall face of a movable mold body of the injection mold cavity with the external gas control device; each set of the gas channel controls the gas inlet pressure through a gas-controlled pressure reducing valve with an electronic pressure controller when gas enters the gas channel and assists in gas exhaust through a flow velocity-controllable vacuum pump when the gas is exhausted.Through cooperative act of the two sets of the gas channels, precise control over the internal pressure of the mold cavity in the injection molding production process can be achieved, and meanwhile the uniformity and stability of pressure distribution are improved.The injection mold can be applied to a short-shot microcellular foaming injection molding technology to produce a product of which the surface is free of silver streaks and bubble pits and internal bubble holes are tiny and compact and also can be applied to a gas back pressure auxiliary injection molding technology and an external gas auxiliary injection molding technology.

Description

technical field [0001] The invention relates to a method and equipment for controlling the cavity pressure of an injection mold, in particular to an injection mold including double gas passages and an external gas pressure control system. Background technique [0002] In many injection molding processes, such as structural foam injection molding, multi-component injection molding, reaction injection molding, exhaust injection molding, micro-foaming injection molding, gas-assisted injection molding, vibration injection molding, micro-injection molding, etc., the pressure in the mold cavity during the production process is directly It is related to the quality of the final product, including product dimensional accuracy, surface gloss, product mechanical properties, and internal cell morphology of foamed parts. The control of cavity pressure has become a key part of the polymer injection molding production process, and more accurate, stable and sensitive cavity pressure contro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/77B29C45/57B29C45/26
CPCB29C45/26B29C45/57B29C45/77B29C2945/76498
Inventor 张磊赵国群
Owner SHANDONG UNIV
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