YASUHARA, Toshiyuki
(Tokyo Institute of Technology, Mechanical Engineering and Science, Department of Mechanical Science and Engineering, Tokyo Institute of Technology)
,
KATO, Kazunori
(Department of Mechanical Engineering, Shonan Institute of Technology)
,
IMAMURA, Hiroshi
(Tokyo Institute of Technology, Mechanical Engineering and Science, Department of Mechanical Science and Engineering, Tokyo Institute of Technology)
,
OHTAKE, Naoto
(Tokyo Institute of Technology, Mechanical Engineering and Science, Department of Mechanical Science and Engineering, Tokyo Institute of Technology)
In injection molding of an optical disk, a toric lens, etc., their performance depends on the transcription preciseness of fine surface structure of a mold. However, transcription behavior has not been made clear yet, because transcription is made in very short time and the structure is very small. ...
In injection molding of an optical disk, a toric lens, etc., their performance depends on the transcription preciseness of fine surface structure of a mold. However, transcription behavior has not been made clear yet, because transcription is made in very short time and the structure is very small. In this paper, transcription properties have been examined, by using V-grooves of various sizes. machined on mold surfaces, and the following results are obtained. (1) Transcription properties have been made clear experimentally and it was found that the mold temperature $T_D$ makes great influence on the transcription property and that compression applying time $t_c$ should be taken more than 2.0s for fine transcription. (2) A mechanical model of transcription process, in consideration with strain recovery due to viscoelastic property of polymer. is proposed. (3) Simulation results agree with experimental ones fairly well. It means that the transcription model is useful for estimation of transcription property in advance of an actual. injection molding.
In injection molding of an optical disk, a toric lens, etc., their performance depends on the transcription preciseness of fine surface structure of a mold. However, transcription behavior has not been made clear yet, because transcription is made in very short time and the structure is very small. In this paper, transcription properties have been examined, by using V-grooves of various sizes. machined on mold surfaces, and the following results are obtained. (1) Transcription properties have been made clear experimentally and it was found that the mold temperature $T_D$ makes great influence on the transcription property and that compression applying time $t_c$ should be taken more than 2.0s for fine transcription. (2) A mechanical model of transcription process, in consideration with strain recovery due to viscoelastic property of polymer. is proposed. (3) Simulation results agree with experimental ones fairly well. It means that the transcription model is useful for estimation of transcription property in advance of an actual. injection molding.
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가설 설정
i) Viscous deformation of a thin membrane occurs only in pressure increasing stage (#).Actually, deformation after that stage is quite little, according to the numerical results in 5.
제안 방법
Kamiyama [5] reported about the transcription of deep grooves. He dealt with a prism sheet pattern experimentally. However, transcription mechanism has not been made clear yet and it is not easy to know the best transcription condi tions.
In this research, transcription property of a very small V- groove on mold surface in wide range of injection molding conditions has been examined experbnentally Then, a simple transcription process model of a V-groove, in consideration with the deformation recovery of material after holding pres sure releasing, is proposed. Finally, the results of the tran scription height by using the proposed model are compared with experimental ones and it is proved that this simulation model is valid for the prediction of transcription state.
성능/효과
Consequently, it is concluded that the simulation of tran scription height by the use of a membrane bulging model is useful for a brief estimation of transcription height of vari ous size groove in various injection molding conditions and that the correction of the transcription height reduction due to strain recovery is important in the simulation. This simu* lation can be extended to the estimation of unfilled portion size of a minute groove comer on a mold in injection mold* ing in various conditions.
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