Plastic and nonmetallic article shaping or treating: processes – With step of cleaning – polishing – or preconditioning...
Reexamination Certificate
2000-01-27
2002-11-19
Kuhns, Allan R. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
With step of cleaning, polishing, or preconditioning...
C264S219000
Reexamination Certificate
active
06482337
ABSTRACT:
This application claims priority from Japanese Applications 11-018137, filed on Jan. 27, 1999 and 12-004304, filed on Jan. 13, 2000, the entire contents of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for evaluation of abrasion of a forming mold, a production system for molded parts, and a forming mold for mass production, and more particularly, the invention relates to a method for evaluation of abrasion of a resin forming mold, a production system for resin molded parts, and a resin forming mold for mass productions
2. Description of the Related Art
In the forming mold for mass production of molded parts, injection molding for molded parts has been carried out by scores of thousands to hundreds of thousands of shots per unit. In the forming mold for mass production of this kind, the shots are repeated many times whereby the surface of the mold piece constituting a cavity for forming molded parts is worn by ejecting a forming raw material into the cavity. The cavity termed herein is a portion into which raw material is charged in the forming mold, and is a hollow place formed by a fixed mold and a movable mold.
In the case of a molded part having a complicated construction, the shape of the cavity is complicated corresponding to the shape of the molded part. Therefore, the surface of the mold piece or the surface portion thereof having a high resistance of a flowing molten raw material into the cavity is worn greatly. For example, where resin containing glass fiber or the like is used as the raw material, a degree of abrasion is very large.
When the surface of the mold piece becomes worn, an error occurs in dimension of a molded part produced thereby. To prevent this, in designing a mold, the number of shots of the molded parts that can be produced by the forming mold for mass production is planned and limited in advance.
In such a case as described, if the entire mold piece of the forming mold for mass production is abandoned after shotting of the planned number of the molded parts, it results in the waste of still usable part of the forming mold for mass production, therefore, the cost of the forming mold for mass production is highly reflected so that the cost of the molded parts increases.
In view of the foregoing, it is desired that abrasion of the mold piece is evaluated in advance. If a degree of abrasion of the surface of the mold piece can be grasped easily in advance, the result of the evaluation of abrasion can be utilized for the design of the mold piece of the forming mold for mass production, which is therefore desirable.
SUMMARY OF THE INVENTION
The subject of this invention is to provide a method for evaluation of abrasion of a forming mold, a production system for molded parts, and a forming mold for mass production, which enables the evaluation of a degree of abrasion of the surface of the mold piece easily and while avoiding an increase in cost.
For solving the above-described subject, according to a first aspect of this invention, there is provided a method for evaluation of abrasion of a forming mold, including a dividing step for dividing a mold piece into a plurality of divided pieces, where the mold piece constitutes a cavity for forming a molded part, and a judging step for judging an abrasion amount of a surface of each of the plurality of divided pieces, where the abrasion results from charging raw material into a cavity.
Thereby, the mold piece is divided into a plurality of pieces and the abrasion amount can be judged in unit of each divided piece. Therefore, there can be obtained an effect capable of easily grasping a progressing degree of abrasion of which part of the surface of the mold piece is large.
According to a second aspect of this invention, there is provided a method for evaluation of abrasion of the forming mold, wherein the abrasion amount of the surface of each of the plurality of the divided pieces is judged in a state where each of the divided pieces is removed from the forming mold body.
Thereby, there can be obtained an effect of measuring the abrasion amount of the removed divided pieces by a simple measuring instrument such as slide calipers, a micrometer and easily judging a progressing degree of abrasion.
According to a third aspect of this invention, there is provided a method for evaluation of abrasion of the forming mold, wherein the abrasion amount of the surface of each of the plurality of the divided pieces is judged in a state where each of said divided pieces is not removed from a forming mold body.
Thereby, since the abrasion amount can be judged without removing the divided pieces, there can be obtained an effect capable of achieving higher efficiency in terms of time and labor of the abrasion evaluation process. Further, there can be also obtained an effect of being free from occurrence of a mounting error in remounting because there is no steps of removing and remounting.
According to a fourth aspect of this invention, there is provided a method for evaluation of abrasion of the forming mold, wherein a layer having a predetermined thickness is formed on the surface of each of the divided pieces, and when the layer is disappeared, it is judged that the abrasion amount in excess of the predetermined thickness is present.
According to a fifth aspect of this invention, there is provided a method for evaluation of abrasion of the forming mold, including a forming step for forming a multi-layer composed of a plurality of layers having a predetermined thickness, respectively, and different colors on the surface of each of the divided pieces, and a judging step for judging the abrasion amount of the surface of each of the divided pieces from a change in color resulting from peeling of the respective layers of the multi-layer.
According to a sixth aspect of this invention, there is provided a method for evaluation of abrasion of the forming mold, wherein a first marking-off line having a predetermined depth is formed on the surface of each of the divided pieces, and when the first marking-off line is disappeared, it is judged that the abrasion amount in excess of the predetermined depth is present.
According to a seventh aspect of this invention, there is provided a method for evaluation of abrasion of the forming mold, wherein a second marking-off line having a deeper marking-off depth than the predetermined depth of the first marking-off line is formed on the surface of each of the divided pieces.
According to an eighth aspect of this invention, there is provided a method for evaluation of abrasion of the forming mold, wherein satin having a predetermined depth of rugged portions is formed on the surface of each of the divided pieces, and when the satin is disappeared it is judged that the abrasion in excess of the predetermined depth be present.
According to the fourth to eighth aspects of this invention, since the degree of abrasion of the surface can be grasped easily and quantitatively by viewing the surface of the mold piece, there can be obtained an effect capable of achieving higher efficiency in terms of time and labor of the abrasion evaluation process than in the third aspect.
Further, since in the seventh aspect, two kinds of marking-off lines different in depth are formed, there can be obtained an effect capable of judging the abrasion amount of higher accuracy from the state of disappearance of the marking-off line.
According to a ninth aspect of this invention, there is provided a method for evaluation of abrasion of a forming mold, including an examining step for examining dimensions of individual portions of a molded part to be formed from raw material charged into a cavity, and an evaluating step for evaluating thereby an abrasion amount of a surface of the mold piece for forming the molded part, the surface corresponding to a portion of each of the molded part.
Thereby, there can be obtained an effect capable of indirectly evaluating the degree of abrasion of the surface of the mold piece without removing th
Fukui Shigenobu
Kohno Hiroyuki
Nishijima Mikio
Suzuki Hiroyuki
Kuhns Allan R.
Ricoh & Company, Ltd.
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