Super hard alloy dies for extruding honeycomb structures

• US 4,820,146 A
• Filed: 08/11/1987
• Issued: 04/11/1989
• Est. Priority Date: 08/14/1986
• Status: Expired due to Fees

• Current Assignee: Institute of Technology Precision Electrical Discharge Works, NGK Insulators Limited
• Original Assignee: Institute of Technology Precision Electrical Discharge Works, NGK Insulators Limited
• Inventors: Inoue, Satoru, Futamura, Shoji
• Primary Examiner(s): Woo, Jay H.
• Assistant Examiner(s): Bushey, C. Scott
• Application Number:
  US07/084,026
• Time in Patent Office: 609 Days
• Field of Search: 264/177.12, 264/209.8, 264/173, 264/177.11, 264/209.1, 420/440, 420/448, 420/460, 425/183, 425/461, 425/462, 425/463, 425/464, 425/465, 425/197, 425/198, 425/199, 428/908.8
• US Class Current: 425/461
• 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: 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 honeycomb structure forming die has a forming section provided with at least forming channels and a plurality of opening holes. The forming channels have a sectional shape conforming to that of honeycomb structural bodies to be extruded by the die, and have a given depth from a front face of the die toward a rear face thereof. The opening holes are independently formed from the die rear face toward the die front face and communicate with the forming channels. The honeycomb structure forming die is further provided with communicating holes which communicate with the opening holes of the forming section.

Claims

1. A die for extruding honeycomb structures, comprising:

a die body made of a super hard alloy, said die body having an entrance surface and an exit surface, said surfaces being located on opposite parallel sides of said die body;

a plurality of intersecting forming channels formed in said exit surface in a direction substantially normal to said exit surface, said forming channels having a geometric configuration substantially corresponding to a geometric configuration of a honeycomb structure to be formed thereby; and

a plurality of independent opening holes formed in said entrance surface in a direction substantially normal to said entrance surface such that said opening holes communicate with said forming channels;

wherein the center of each opening hole is coaxial with an intersection of the center planes of at least two forming channels.

2. A die for extruding honeycomb structures according to claim 1, further comprising a die base portion bonded to the die body at said entrance surface thereof, said die base portion being made of a carbon steel and including longitudinal communicating holes formed therethrough in a substantially parallel direction to said opening holes, such that said communicating holes communicate with said opening holes.

3. A die for extruding honeycomb structures, comprising:

a die body made of a super hard alloy having an entrance surface and an exit surface, said surfaces being located on opposite parallel sides of said die body;

a plurality of intersecting forming channels formed in said exit surface in a direction substantially normal to said exit surface, said forming channels having a geometric configuration substantially corresponding to a geometric configuration of a honeycomb structure to be formed thereby; and

a plurality of independent opening holes each having a substantially uniform cross-sectional shape substantially corresponding to a parallelogram, said holes being formed in said entrance surface in a direction substantially normal to said entrance surface such that said opening holes communicate with said forming channels;

wherein the center of each opening hole is coaxial with an intersection of the center planes of at least two forming channels, and opposite corners of each opening hole are arranged in the center plane of at least one forming channel.

4. A die for extruding honeycomb structures according to claim 3, wherein both pairs of opposite corners of each opening hole are arranged in the center planes of at least two forming channels.

5. A die for extruding honeycomb structures according to claim 3, further comprising a metallic die base portion bonded to the die body at said entrance surface thereof, said die base portion including longitudinal communicating holes formed therethrough in a substantially parallel direction to said opening holes, such that said communicating holes communicate with said opening holes.

6. A die for extruding honeycomb structures according to claim 3, wherein said plurality of independent opening holes each have a substantially uniform cross-sectional shape substantially corresponding to a rectangle.

7. A die for extruding honeycomb structures according to claim 3, wherein said plurality of independent opening holes each have a substantially uniform cross-sectional shape substantially corresponding to a square.

8. A die for extruding honeycomb structures according to claim 3, wherein said plurality of independent opening holes each have a substantially uniform cross-sectional shape substantially corresponding to a rhombus.