Ultrasonic vibration-assisted injection molding method and device

An ultrasonic vibration and injection molding technology, applied in the coating and other directions, can solve the problem that the molten plastic cannot meet the shrinkage volume of the plastic part, does not solve the problem of clogging the flow resistance of the molten material, and cannot achieve the design target shape, etc., to shorten the injection molding. cycle, reduce injection time, and improve the effect of molding contour accuracy

Inactive Publication Date: 2019-01-18
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the device and method did not improve the defects generated on the side of the injection machine, and did not solve the problems of the blockage of the molten material at the nozzle and the gate, and the large flow resistance of the molten material in the barrel.
[0004] In the process of injection molding, under-injection is prone to occur, and the design target shape cannot be achieved, that is, the injection is completed, and the cavity is not completely filled; the lack of forming is due to the defects formed by cooling and hardening of the molten injection molding resin before it is completely filled in the cavity. It may be that the injection pressure or injection speed is too low, and the exhaust effect is not good.
Depression (shrinkage pit) is the most common surface defect of molded products. It is caused by thermal shrinkage of molded products. The shrinkage volume can be solved by increasing the holding pressure, but when a high holding pressure is applied after the filling process is completed, residual stress will be formed inside the molded product and cause burrs to occur
In addition, during the injection molding process, the molten material often blocks the nozzle and the gate, and the gas in the molten material will also have a greater impact on the quality of the plastic part. Although the injection molding process is relatively mature at present, these problems still exist. exists, there is no better solution

Method used

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  • Ultrasonic vibration-assisted injection molding method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1 (Ultrasonic Vibration Assisted Plunger Injection Machine Injection Molding)

[0034] Ultrasonic vibration assisted injection molding device, combined with figure 1 As shown, it includes a molding mechanism 1, an injection mechanism and an ultrasonic vibration mechanism. The injection mechanism includes a nozzle 2, a splitter comb 3, a barrel 4, a hopper 5, a plunger 6, a hydraulic device 9 and a heater 11; the ultrasonic vibration mechanism includes a horn 7, a transducer 8, a fixing device 10, a wire 13 and Ultrasonic generator 12.

[0035] The horn 7, the transducer 8 and the fixing device 10 are arranged inside the body of the injection molding machine; the plunger 6 is threaded to the horn 7 through a stud, and the horn 7 is threaded to the transducer 8 through a stud. The transducer 8 is connected to the ultrasonic generator 12 through the wire 13, and the flange of the horn 7 is fixed on the piston rod 14 through the fixing device 10.

[0036] The ...

Embodiment 2

[0039] Embodiment 2 (Ultrasonic Vibration Assisted Screw Injection Machine Injection Molding)

[0040] combined with figure 2 As shown, the device includes a molding mechanism 15, an injection mechanism, a transmission mechanism and an ultrasonic vibration mechanism. The injection mechanism includes a nozzle 16, a barrel 17, a heating ring 18, a hopper 19, a screw 23, a piston rod 21 and a hydraulic device 22; a transmission mechanism includes a gearbox 20, a screw transmission gear 25 and a screw spline 24; the ultrasonic vibration mechanism includes a variable Spindle 26 , transducer 27 and fixture 28 .

[0041] The screw rod 23 is fixedly connected with the screw spline 24, the screw spline 24 is connected with the horn 26, the horn 26 is threaded with the transducer 27 through a stud, and the flange of the horn 26 is fixed on the On the piston rod 21, the screw drive gear 25 is installed on the screw spline 24. The transducer 27 is electrically connected with the ultra...

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PUM

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Abstract

The invention discloses an ultrasonic vibration-assisted injection molding method and device and relates to the field of injection molding. The device comprises a forming mechanism, an injection mechanism and an ultrasonic vibration mechanism. The ultrasonic vibration mechanism is arranged between a plunger and a hydraulic device, an amplitude-change pole amplifies an ultrasonic vibration amplitude and transfers the same to the plunger, the plunger then transfers vibration to a melt, and injection molding in different conditions is met by changing the frequency, amplitude and vibrating mode ofultrasonic vibration. The method and device are wide in applicability, improve the quality of a plastic part, improve the flowing rate of a melted plastic in a charging barrel, a nozzle and a cavity,reduce the injection time, shorten the injection molding period and improve the percent of pass of the plastic part.

Description

technical field [0001] The invention relates to the field of injection molding, in particular to a method and device for ultrasonic vibration-assisted injection molding. Background technique [0002] Injection molding is a method in which heat-melted plastic is injected into a mold cavity by high pressure through an injection molding machine, and after cooling and solidification, a molded product is obtained. Injection molding has fast production speed, high efficiency, automatic operation, various designs and colors, shapes from simple to complex, and sizes from large to small, and the products are accurate in size, easy to update and replace, and can make plastic parts with complex shapes. Injection molding is suitable for molding processing fields such as mass production and products with complex shapes. [0003] Ultrasonic-assisted injection molding device and molding method for direct molding metal flash products (patent publication number CN104999633A) proposes that a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/00B29C45/03B29C45/17B29C45/76
CPCB29C45/00B29C45/03B29C45/17B29C45/76
Inventor 姜银方沙德利姜文帆
Owner JIANGSU UNIV
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