Method of manufacturing die

• US 20010004068A1
• Filed: 12/08/2000
• Published: 06/21/2001
• Est. Priority Date: 12/10/1999
• Status: Active Grant

• Current Assignee: NGK Insulators Limited
• Original Assignee: NGK Insulators Limited
• Inventors: Kondo, Yoshimasa, Ishii, Takeyuki, Shibagaki, Yukinari
• Granted Patent: US 6,621,034 B2
• Time in Patent Office: Days
• US Class Current: 219/69.17
• CPC Class Codes: B23H 2200/30 for making honeycomb structures
• CPC Class Codes: B23H 9/00 Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects heat treatment by cathodic discharge C21D1/38
• CPC Class Codes: B23P 15/243 Honeycomb dies
• CPC Class Codes: B28B 3/269 For multi-channeled structures, e.g. honeycomb structures
• CPC Class Codes: B29C 48/11 comprising two or more partially or fully enclosed cavities, e.g. honeycomb-shaped
• CPC Class Codes: B29L 2031/60 Multitubular or multicompartmented articles, e.g. honeycomb

Abstract

A method of manufacturing a die having batch supply holes arranged at a batch supply side thereof, slits arranged at a batch discharge side thereof for forming the batch, and batch hold portions made of lateral holes, which are arranged at least at intersecting portions between the batch supply holes and the slits and are arranged corresponding to the slits, is disclosed. The improvement includes the steps of: preparing a die main body; (1) performing a batch supply hole machining with respect to one principle plane of the die main body so as to form the batch supply holes and a slit machining with respect to the other principle plane of the die main body so as to form the slits; and performing a lateral hole machining so as to form the batch hold portions, which are arranged at least at intersecting portions in the die main body between the batch supply holes and the slits and are arranged corresponding to the slits; or (2) performing a slit machining with respect to one principle plane of the die main body and a lateral hole machining so as to form the batch hold portions arranged corresponding to the slits in the die main body; and performing a batch supply hole machining with respect to the other principle plane of the die main body so as to form the batch supply holes; thereby forming an integral die.

Claims

1. A method of manufacturing a die having batch supply holes arranged at a batch supply side thereof, slits arranged at a batch discharge side thereof for forming the batch, and batch hold portions made of lateral holes, which are arranged at least at intersecting portions between the batch supply holes and the slits and are arranged corresponding to the slits, comprising the steps of:

preparing a die main body;

performing a batch supply hole machining with respect to one principle plane of the die main body so as to form the batch supply holes and a slit machining with respect to the other principle plane of the die main body so as to form the slits; and

performing a lateral hole machining so as to form the batch hold portions, which are arranged at least at intersecting portions in the die main body between the batch supply holes and the slits and are arranged corresponding to the slits;

thereby forming an integral die.

3. The method of manufacturing a die according to

claim 1

or

2

, wherein the lateral hole machining is performed by at least one of wire electric-discharge machining, electrochemical machining, wire lap machining, diesinking electric-discharge machining, water-jet machining, drill machining and laser machining.

4. The method of manufacturing a die according to

claim 1

or

2

, wherein the slit machining and the lateral hole machining are performed continuously by wire electric-discharge machining.

5. The method of manufacturing a die according to

claim 1

or

2

, wherein the manufactured die is used for extruding a thin wall honeycomb structural body having a rib thickness of not larger than 150 μ

m.

6. The method of manufacturing a die according to

claim 1

or

2

, wherein a width of the slit is not larger than 250 μ

m.

7. The method of manufacturing a die according to

claim 1

or

2

, wherein the manufactured die is used for extruding a honeycomb structural body having a cell open rate of not smaller than 75%.

8. The method of manufacturing a die according to

claim 1

or

2

, wherein the manufactured die is used for extruding a honeycomb structural body having a cell density of not larger than 1800 cell/inch².

2. A method of manufacturing a die having batch supply holes arranged at a batch supply side thereof, slits arranged at a batch discharge side thereof for forming the batch, and batch hold portions made of lateral holes, which are arranged at least at intersecting portions between the batch supply holes and the slits and are arranged corresponding to the slits, comprising the steps of:

preparing a die main body;

performing a slit machining with respect to one principle plane of the die main body and a lateral hole machining so as to form the batch hold portions arranged corresponding to the slits in the die main body; and

performing a batch supply hole machining with respect to the other principle plane of the die main body so as to form the batch supply holes;

thereby forming an integral die.