Study on structural optimization of disc screw in micro injection machine

doi:10.19491/j.issn.1001-9278.2022.02.021

Abstract

Abstract:

To improve the plasticizing performance during the processing， the plasticizing process of disk screw micro?injection machine was numerically simulated through multi?physical field modeling using a simulation software， and the structure of disc screw was optimized. Theoretical analysis was first carried out on the structural parameters of the moving plate， and then simulation calculation and analysis were performed on the structure through changing the structural parameters. The influence of each parameter on the plasticizing performance was evaluated. Finally， an optimized structure of disc screw was designed through combining the effect of various parameters on the disc screw of plasticizing capability and considering the actual situation of the disc screw. The results indicated that the plasticizing performance of the disc screw micro?injection molding machine was improved significantly through using an optimized disc screw structure with a reduced groove width in the prototype structure to leave space to construct three screw grooves.

Key words: micro injection molding, disc screw, structure optimization, plasticization, finite element simulation

CLC Number:

TQ320.5

ZHANG Xiang, YAN Zhenhao, KONG Xiaoya, ZHU Jianxiao, GUAN Guotao, ZHAO Na, LI Qian. Study on structural optimization of disc screw in micro injection machine[J]. China Plastics, 2022, 36(2): 147-156.

Figures/Tables 19

盘式螺杆直径/mm	入口螺槽宽度/mm	入口螺槽深度/mm	出口螺槽宽度/mm	出口螺槽深度/mm	螺槽圈数	动定盘间隙/mm
80	6.603	3.376	6.603	0.986	1.417	0.400

Tab.1. Geometric parameters of disc screw of the prototype

Fig.1. Structure and plasticizing performance of different disk screws

型号	入口深度/mm	出口深度/mm
1	1.125	0.329
2	2.250	0.657
3	3.376	0.986
4	4.500	1.315
5	5.630	1.644
6	6.750	1.974

Tab.2. Channel depth parameters

型号	流体流动速率最大值/mm·s^-1	流体出口流速/ mm·s^-1	流体剪切速率最大值/s^-1
1	4.13	1.15	7.08
2	5.13	1.39	8.52
3	5.82	1.50	11.00
4	5.86	2.01	8.84
5	6.01	2.48	9.25
6	5.88	2.93	9.11

Tab.3. Plasticization performance parameters of different types of disc screws

Fig.2. Fluid velocity distribution in different types of disc screws

Fig.3. Phase transition of the material in different types of disc screws

Fig.4. Fluid dynamic viscosities in type 1 and type 6 disc screw

Fig.5. Plasticizing performance of different disc screws

Fig.6. Study models of different channel width

Fig. 7. Fluid velocity distribution in disc screws with different channel widths

Fig.8. Models of disk screws with different cross sections

Fig.9. Fluid velocity distribution in disk screws with different cross sections

Fig.10. Fluid dynamic viscosity distribution in disk screws with different cross sections

型号	螺槽圈数	流体流动速度/mm·s^-1	流体出口流速/mm·s^-1	流体剪切速率/s^-1
I	0+0.416 6	4.27	1.321	8.57
II	0.5+0.416 6	4.45	1.332	8.66
III	1+0.416 6	4.30	1.250	8.14
IV	1.5+0.416 6	4.06	1.170	7.61
V	2+0.416 6	3.78	1.090	7.10

Tab.4. Number of turns of each type of spiral channels

Fig.11. Model of different types of disc screws

Fig.12. Fluid velocity distribution in different types of disc screws

Fig.13. Fluid pressure distribution in different types of disc screws

Fig.14. Material phase transition distribution in different types of disc screws

Fig.15. Structure and simulation results of three?channel disk screws

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