Die for manufacturing honeycomb bodies

Details Die for manufacturing honeycomb bodies Die for manufacturing honeycomb bodies

1999-10-29

2001-09-11

Nguyen, Nam (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

C425S464000, C264S177120

Reexamination Certificate

active

06287103

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a die for manufacturing honeycomb bodies used for extruding honeycomb structural bodies.
2. Description of Related Art
Generally, various kinds of dies for manufacturing honeycomb bodies are known, having; a die main body including batch supply holes which are opened to a backside surface of the die, slit channels which communicate with the batch supply holes open to a foreside surface of the die, and a chamfered conical-like surface or taper worked portion formed by working an outer peripheral portion of the foreside surface of the die in a taper manner; and a control plate arranged at a portion opposed to the taper worked portion.
FIG. 4
is a schematic view showing one embodiment of a known die for manufacturing honeycomb bodies. In the embodiment shown in
FIG. 4
, a die
51
for manufacturing honeycomb bodies comprises a die main body
52
and a control plate
53
. The die main body
52
has a disk-shape and comprises batch supply holes
61
which are opened to its backside surface (lower surface (not shown) in
FIG. 4
) and slit channels
62
which are opened to its foreside surface (upper surface in FIG.
4
). The slit channels
62
have a crisscross shape at the foreside surface of the die main body
52
, and the batch supply holes
61
are communicated with alternate intersection points. An outer peripheral portion of the die main body
52
is worked into a taper shape to form a taper worked portion
63
. The control plate
53
is connected to the die main body
52
via a spacer
64
in such a manner that one surface
53
a
is opposed (parallel in
FIG. 4
) to the taper worked portion
63
.
In the die
51
for manufacturing honeycomb bodies having the construction shown in
FIG. 4
, a ceramic batch for example is supplied from the batch supply holes
61
which are opened to the backside surface of the die
51
, and the thus supplied ceramic batch is extruded from the slit channels
62
which are opened to the foreside surface of the die
51
, so as to obtain a honeycomb structural body. Then, it is possible to reduce an inward batch stress when an outer wall is formed and to prevent a collapsing of outer cells i.e. a generation of wrinkle portions in the honeycomb structural body by forming the taper worked portion
63
at the outer peripheral portion of the die main body
52
and by arranging the control plate
53
at a portion opposed to the taper worked portion
63
. However, if a thin wall honeycomb structural body having a thin rib thickness, which is required recently, is to be formed, an isostatic strength of the honeycomb structural body become smaller correspondingly since the rib thickness is thin. Therefore, at the outer portion of the honeycomb structural body to which a pressure is liable to be applied, ribs are deformed and wrinkle portions are liable to be generated. As a result, the honeycomb structural bodies thus obtained are liable to be inferior goods.
SUMMARY OF THE INVENTION
An object of the invention is to eliminate the drawbacks mentioned above and to provide a die for manufacturing honeycomb bodies in which rib strength can be improved and prevent generation fatally defective of wrinkle portions at an outer portion of a thin honeycomb body.
According to the invention, a die for manufacturing honeycomb bodies including; a die main body having batch supply holes which are opened to a backside surface of the die, slit channels which communicate with the batch supply holes and open to a foreside surface of the die, and a chamfered conical-like surface or taper worked portion formed by working an outer peripheral portion of the foreside surface of the die in a taper manner; and a control plate arranged at a portion opposed to the taper worked portion, comprises slit channel expanding portions formed at open ends of the slit channels existing in the taper worked portion to gradually expand the slit channel toward the open end.
In the present invention, since the slit channel expanding portions having the construction mentioned above are arranged at a predetermined portion of the slit channels existing in the taper worked portion of the outer peripheral portions, a larger amount of batch can be supplied to the slit channel expanding portions as compared with that of the other portion, and thus the outermost ribs of the honeycomb structural body can be strengthened. Therefore, an isostatic strength of the honeycomb structural body can be improved even if the honeycomb structural body has a thin wall, and it is possible to prevent a generation of wrinkle portions at the outer portion.


REFERENCES:
patent: 4298328 (1981-11-01), Frost
patent: 4349329 (1982-09-01), Naito et al.
patent: 4381912 (1983-05-01), Yamamoto et al.
patent: 4384841 (1983-05-01), Yamamoto et al.
patent: 5089203 (1992-02-01), Kragle
patent: 5256054 (1993-10-01), Cocchetto et al.

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