Appeal No. 2000-0093
Application No. 08/874,812
Tamura ‘340 discloses
a method for manufacturing a metallic mold [i.e., a metallic casting] in
which multiple slice panels are polymerized together to produce a metallic
mold pattern [i.e., a unitary investment pattern], and the aforementioned
metallic mold pattern is used to produce a metallic mold by means of full
mold casting, a method for manufacturing a metallic mold characterized in
that the thickness of the aforementioned multiple slice panels is varied in
accordance with the curvature of the outline to be formed by the metallic
mold pattern [translation, page 4].
Tamura ‘340 describes this method in more detail as follows:
Figure 1 is an application example of the present invention, and
shows all of the steps in the method for manufacturing a metallic mold by
means of full mold casting using a metallic mold pattern. As shown in
Figure 1, when a metallic mold is manufactured, first, using a computer,
multiple 2-dimensional figure data which represent parsed planar images
and external planar images for the metallic mold to be manufactured are
input, and 3-dimensional shape data which represent the overall image of
the metallic mold are produced and recorded (S1) .
Next, with the computer that stores the aforementioned
3-dimensional shape data, outline data for each slice section are
produced from the aforementioned 3-dimensional shape data by making
slice sections of a specific pitch in the lengthwise direction of-the metallic
mold (S2). With regard to this slicing, when, for example, the portion of
the metallic mold that constitutes its surface has the horizontal outline a
such as is shown by the broken line in Figure 2, the pitch is changed
according to the curvature of that outline a; the pitch of the slicing is made
small at the sections where the curvature is large, and the pitch of the
slicing is made large at the sections where the curvature is small. As
shown in Figure 3, when the slicing occurs, the thickness of each slice
section i.e., pitch Xn, Xn + 1, Xn, + 2 is made such that the shift in the
coordinates of contiguous slice sections, in the direction of slicing, is a
constant value *.
Next, based on the pitch dimensions data and the outline data for
each slice section obtained by the computer, straight foamed styrol
material is cut to form multiple thin planar slice panels with a thickness
equal to the pitch of the respective slice sections. At the same time, said
slice panels are processed into shapes with an outline corresponding to
each slice section (S3).
Here, as for the processing of the shape of the outline of the
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