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Micro-injection moulding method based on laser plasticizing and impacting technology and apparatus

A laser shock and micro-injection technology, applied in coating and other directions, can solve the problems of poor control accuracy of one shot and molding quality, difficult screw processing, and high strength requirements. Body plasticizing effect

Active Publication Date: 2013-04-17
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Screw micro-injection molding machine, the plasticization, metering and injection are all completed by a group of screws. The diameter generally cannot be lower than 14mm, which makes the control accuracy of the equipment for one injection volume and the stability of the molding quality poor
In terms of material processing using laser shock technology, Jiangsu University has obtained a series of patents and research results, such as impact forming of sheet metal, patents include ZL02264630.2, CN1931467A, CN101518852A, etc. Laser shock forming is induced by high-energy laser The force effect of high-amplitude shock wave pressure, rather than thermal effect, enables plastic forming processing of sheet metal, however, does not involve fast and efficient micro-injection molding based on laser processing

Method used

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  • Micro-injection moulding method based on laser plasticizing and impacting technology and apparatus
  • Micro-injection moulding method based on laser plasticizing and impacting technology and apparatus
  • Micro-injection moulding method based on laser plasticizing and impacting technology and apparatus

Examples

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example 1

[0042] Example 1, taking typical thermoplastic PMMA as an example, the melting temperature range of plastic PMMA is 250~370 degrees, CO 2 The laser is used as a laser for plasticization, and the laser wavelength generated is 10.6 microns, and the plastic PMMA has a 2 Laser absorption is good. The valve is in working condition 2. After drying, plastic PMMA particles with a diameter of 2 mm, a height of 2 mm and a mass of 6.5 mg are put into a plasticizing cylinder with a preheating temperature of 105-220 degrees, and the plasticizing rod is pressed against the PMMA particles. , the laser starts to work, and outputs a continuous wave low-power laser with a spot diameter of 5mm and a power of 2W, and is irradiated at a fixed point, and the irradiation time is 0.05~0.1s. After the plastic PMMA is plasticized, the valve turns to working state 1, and the plasticizing rod pushes the plastic melt into the injection unit. After the plastic melt is injected into the injection unit, the...

example 2

[0043] Example 2, taking typical thermoplastic polyurethane TPU as an example, the melting temperature range of plastic TPU is generally between 170-205 degrees, CO 2 The laser wavelength generated by the laser is 10.6 microns, and the plastic TPU absorbs it well. The diameter of plastic TPU particles is 2mm, and the thickness is 2mm. After drying, weigh 50mg with a precision balance, and put it into a plasticizing cylinder with a preheating temperature of 140-170 degrees. 2 The laser starts to work, outputting a continuous wave low-power laser with a spot diameter of 3mm and a power of 3W, and continuously scans and irradiates the plastic TPU for 5s. The plastic TPU is plasticized and injected into the injection unit. The pulse wave laser of the laser shock injection system generates high-energy pulse laser. The energy of the pulse laser is 5J, the spot diameter is 5mm, and the pulse width is 20ns. The absorbent absorbs the laser energy and is ionized by high temperature to g...

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Abstract

The invention discloses a micro-injection moulding method based on laser plasticizing and impacting technology and an apparatus, and relates to a plastic micro-moulding field, particularly a plastic micro-injection moulding method based on the laser plasticizing and impacting action, suitable for plastic micro-injection moulding process. The apparatus comprises: a plastic plasticizing system, which is composed of a laser, a laser beam controller, a plasticizing cylinder, a valve and a heating and temperature controlling device; an impact propulsion and injection system, which is composed of a laser generator, a restraint layer, a laser absorbent, a impact injection push rod, and a heating and temperature controlling device; a mould; and a computer control system, for controlling the plasticizing system, the impact propulsion injection system and the valve, and controlling the temperature. The invention provides a novel micro-injection moulding method and an apparatus, resolves the problems in the plastic plasticization and melt injection propulsion manners for micro-injection moulding, and implements the purposes of energy saving, environmental protection and high efficiency for micro-injection moulding.

Description

technical field [0001] The invention relates to the field of micro-injection molding, in particular to a micro-injection molding method and device based on laser plasticization and laser shock technology, which is suitable for injection molding processing of tiny plastic parts. Background technique [0002] As we all know, with the progress of micro-nano science and technology, micro-electro-mechanical system products continue to develop towards miniaturization, and micro-injection molding technology with a characteristic scale of milligram level has been highly valued by people. Compared with traditional injection molding technology, Micro-injection molding puts forward higher requirements on molding process and molding equipment. The special requirements of micro-injection molding technology are mainly reflected in the following aspects: [0003] (1) Injection rate. Due to the small mass and volume of microinjection molded parts, high injection rates are required during m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/00B29C45/17B29C45/46B29C45/76
Inventor 谭文胜周建忠黄舒杨晶陈寒松陈松玲孟宪凯
Owner JIANGSU UNIV
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