Honeycomb formed body extruding die

Patent metadata

Field	Value
Publication number	US-9486794-B2
Application number	US-201514885085-A
Country	US
Kind code	B2
Filing date	Oct 16, 2015
Priority date	Nov 18, 2014
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

A die has two surfaces, in a forming material supplying surface which is one surface, a plurality of back holes to introduce a forming material of a honeycomb formed body into the die are formed, and in a honeycomb formed body extruding surface which is the other surface, lattice-shaped slits corresponding to cell partition walls are formed, the back holes communicate with the slits in slit intersecting portions of the slits, polygonal cell blocks defined by the slits include chamfered portions in which parts of corner portions and the like are chamfered at a chamfering angle θ of 1.0 to 8.0° to the extruding direction, from the honeycomb formed body extruding surface toward a slit depth direction, and straight portions which are not chamfered, and a ratio of a length L of the straight portion to a slit depth D is from 20 to 60%.

First claim

What is claimed is:

1. A honeycomb formed body extruding die to extrude a honeycomb formed body, the die having two surfaces,
wherein in a forming material supplying surface which is one surface, a plurality of back holes to introduce a forming material of the honeycomb formed body into the die are formed in an extruding direction,
in a honeycomb formed body extruding surface which is the other surface, lattice-shaped slits corresponding to cell partition walls of the honeycomb formed body are formed in the extruding direction,
the back holes communicate with the slits in slit intersecting portions of the slits,
polygonal cell blocks defined by the slits comprise:
chamfered portions in which parts of corner portions are chamfered at a chamfering angle of 1.0 to 8.0° to the extruding direction, from the honeycomb formed body extruding surface toward a slit depth direction; and
straight portions which are not chamfered, and
a ratio of a length of the straight portion to a slit depth is from 20 to 60%.

2. The honeycomb formed body extruding die according to claim 1 ,
wherein widths of the slits are from 50 to 130 μm.

3. The honeycomb formed body extruding die according to claim 2 ,
wherein a ratio of a slit side intersection point width to a back hole side intersection point width in the slit intersecting portions is from 1.5 to 2.5.

4. The honeycomb formed body extruding die according to claim 1 ,
wherein a curvature radius of each of corner portions of the straight portion is from 0.03 to 0.08 μm.

5. The honeycomb formed body extruding die according to claim 1 ,
wherein an abrasion resistant layer is formed on the surface of each of the polygonal cell blocks.

6. The honeycomb formed body extruding die according to claim 1 ,
wherein the polygonal cell blocks are made of a cemented carbide material.

Assignees

• Ngk Insulators Ltd

Inventors

• Watanabe Takehiko
• Hayashi Seiichiro
• Hamatsuka Kazuhiko

Classifications

• B23P15/243

  Honeycomb dies · CPC title

• B28B3/269

  For multi-channeled structures, e.g. honeycomb structures · CPC title

• B29C47/0028

  Operations & Transport · mapped topic

• B29C47/12

  Operations & Transport · mapped topic

• B01J35/04 Primary

  Operations & Transport · mapped topic