Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Dividing work to form plural articles
Patent
1996-05-03
1998-08-11
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Dividing work to form plural articles
2642972, 2642978, 2643288, 425588, B28B 1112, B29C 4512, B29C 4532
Patent
active
057924066
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of preparing a plurality of spherical moldings, and more particularly, it relates to a method of preparing spherical moldings comprising a step of making it possible to obtain a sphere series formed by coupling a plurality of moldings with each other by injection molding.
BACKGROUND TECHNIQUE
In general, various methods of forming moldings in a multiple manner are proposed in order to improve productivity in injection molding. For example, Japanese Patent Laying-Open No. 58-87029 discloses a method of coupling a number of gates for supplying molten resin to molding forming parts to a runner of a molding machine, thereby enabling simultaneous forming of a number of moldings.
In such a forming method, however, a forming part for obtaining one molding is coupled to one gate. In case of obtaining a number of moldings by single forming, the number of the gates must have been inevitably increased in response to the number of the moldings. Consequently, the volume of the runner with which the gates are connected must have been inevitably increased due to the increase of the number of the gates.
In injection molding of a quantity of moldings, therefore, runner loss has been increased and the molding efficiency has not been much improved, although the molding time can be reduced. As the moldings to be obtained are reduced in size, the volume of the runner is increased with respect to that of the moldings, and hence reduction of the molding efficiency caused by the aforementioned increase of the runner loss has remarkably appeared.
To this end, a method of employing a hot runner or a mini hot runner is proposed as a method of reducing the runner loss, as disclosed in Japanese Patent Laying-Open No. 2-131912. In the method described in this prior art employing a hot runner or a mini hot runner, however, multiple taking has been so limited that only about several 10 moldings have been simultaneously formable. Namely, it has been impossible to simultaneously form more moldings such as hundreds or thousands of them.
In moldings obtained in such a multiple manner, further, a plurality of moldings are taken out from a metal mold in a coupled state. When spherical moldings are obtained in a multiple manner, for example, a sphere series in which spherical moldings are coupled with each other in a point or line contact manner is taken out from the metal mold.
Therefore, it has been necessary to separate the sphere series into the individual spherical bodies after the forming, in order to obtain the individual spherical bodies. As a method of separating such a sphere series into individual spherical bodies, (1) a method of parting the individual spherical bodies one by one from the sphere series with a cutting tool such as a cutter or scissors, or (2) a method of introducing the sphere series into a mortar and thereafter push-cutting the same with a pestle thereby parting the same into individual spherical bodies has been employed.
In each of the aforementioned parting method employing a cutter or scissors and the method of parting the sphere series in a mortar with a pestle, however, the operation of parting the sphere series into the individual spherical bodies has been troublesome. Namely, it has been difficult to continuously and efficiently part a large amount of sphere series into individual spherical bodies.
For the spherical moldings, further, provision of fine textures on the surfaces is required depending on the use. In order to provide such textures, various polishing methods have been proposed in general.
As a method of polishing materials such as synthetic resin, fiber reinforced resin, ceramics and metals, Japanese Patent Laying-Open No. 58-192741 discloses a spherical body working apparatus consisting of a spherical guide table and a rotary grindstone which is opposed to its guide way for arranging spherical bodies to be worked in the aforementioned guide way on guide grooves provided on the guide way and grinding the aforementioned spherical bodies
REFERENCES:
patent: 2335294 (1943-10-01), Meyer
patent: 5525279 (1996-06-01), Yamazaki et al.
Nakaizumi Masahiro
Sakakiyama Shoji
Wada Takuya
Japan Immuno Research Laboratories Co., Ltd.
Lee Edmund H.
Sekisui Kagaku Kogyo Kabushiki Kaisha
Silbaugh Jan H.
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