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Injection molding method of plastic piece

A technology of plastic parts and injection molding machines, which is applied in the field of injection molding of plastic parts. It can solve the problems of welding marks, fusion marks, and incomplete fusion of molten materials in plastic parts, and achieve the effect of no bonding marks and improved aesthetics.

Inactive Publication Date: 2017-11-17
LIUZHOU YUHUA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides an injection molding method for plastic parts, which can solve the problem in the existing injection molding method that multiple strands of molten material entering the heat flow channel from multiple gates cannot be completely fused together, resulting in the formation of fusion marks, resulting in the appearance of plastic parts. weld line problem

Method used

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  • Injection molding method of plastic piece
  • Injection molding method of plastic piece
  • Injection molding method of plastic piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] figure 2 , image 3 The hot runner mold of the injection molding machine shown includes a mold heater, a punch 3 installed on the fixed plate 4 and a die 2 installed on the die plate 1; after the punch 3 and the die 4 are closed The cavity of the plastic part is formed; the fixed mold fixed plate 4 is connected with the fixed mold bottom plate 5 through the fixed mold foot 10; a hot runner plate 9 is arranged between the fixed mold fixed plate 4 and the fixed mold bottom plate 5; There are connected heat flow main road 62 and heat flow branch road 61; the entrance of heat flow main road 62 is the gate a of the plastic machine set on the bottom plate 5 of the fixed mold; the punch 3 is provided with two gates b of plastic parts; The two gates b of the plastic part are connected to the main heat flow channel 62 through respective heat flow branches 61; the two gates b of the plastic part are provided with needle valve type hot nozzles 7 whose outlets face the cavity of ...

Embodiment 2

[0020] There are six plastic gates b on the punch 3; thermocouples are arranged in the heat flow main channel 62 and the heat flow branch channel 61;

[0021] Its injection molding method is as follows:

[0022] Before injection molding, it is set in the timing controller 12: when the timing controller 12 receives the mold closing signal of the injection molding machine detected by the displacement sensor 11 in real time, it controls the opening of the first needle valve type hot nozzle 7; at the same time, according to the requirements of the injection molding process It is set in the timing controller 12: when the melt just flows through the second needle valve type hot nozzle 7, the timing controller 12 controls the second needle valve type hot nozzle 7 to open, and at the same time controls the first needle valve type hot nozzle 7 to open. The hot nozzle 7 is closed; according to this setting, until the third, fourth, fifth, and sixth needle valve hot nozzles 7 are all ope...

Embodiment 3

[0024] The punch 3 is provided with four gates b of the plastic part; the heat flow branch 61 is provided with thermocouples; the rest are the same as in the second embodiment.

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Abstract

The invention discloses an injection molding method of a plastic piece, and belongs to the technical field of plastic machineries. The injection molding method adopts an injection molding machine hot-runner mould. The injection molding machine hot-runner mould concretely comprises the following steps that before injection molding, a procedure that a time schedule controller controls a first needle valve type hot nozzle to be opened when the time schedule controller receives a mold closing signal, detected in real time by a displacement sensor, of an injection molding machine is set in the time schedule controller; in addition, a procedure that the time schedule controller controls a second needle valve type hot nozzle to be opened when a melt just passes the second needle valve type hot nozzle and by this time, the first needle valve type hot nozzle is opened or closed is set in the time schedule controller; and the rest needle valve type hot nozzles are set in such way till each needle valve type hot nozzle is opened or closed in the corresponding control period. The problem of an existing injection molding machine hot-runner mould that weld marks appear in a plastic piece product due to the fact that multiple streams of molten materials entering a heat passage from multiple sprues can not be completely molten into a whole and thus fusion marks are formed can be solved.

Description

technical field [0001] The invention relates to the technical field of plastic machinery, in particular to an injection molding method for plastic parts. Background technique [0002] The existing injection molding method of plastic parts usually adopts a figure 1 The hot runner mold of the injection molding machine shown, the mold includes the convex mold 03 installed on the fixed mold fixed plate 04 and the die 02 installed on the concave mold fixed plate 01; the fixed mold fixed plate 04 is connected with the fixed mold bottom plate 05 is connected; the punch 03 and the die 02 are closed to form the cavity of the plastic part; the punch 03 is provided with a plurality of plastic gates ob for injecting molten material into the cavity of the plastic part respectively; these plastic gates ob They are all connected to the heat flow main channel 061 through their respective heat flow branch channels 062; the heat flow main channel 061 passes through the fixed mold bottom plat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/27B29C45/28B29C45/73
CPCB29C45/0025B29C45/27B29C45/2737B29C45/28B29C2045/0032B29C2045/274B29C2045/279
Inventor 文运来韦筠寰朱泰金
Owner LIUZHOU YUHUA TECH