Polycrystalline cubic boron nitride body
US-2020277187-A1 · Sep 3, 2020 · US
Wire drawing die
US12318828B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12318828-B2 |
| Application number | US-202118019177-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 11, 2021 |
| Priority date | Aug 24, 2020 |
| Publication date | Jun 3, 2025 |
| Grant date | Jun 3, 2025 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
A wire drawing die 1 includes a non-diamond material, is provided with a die hole 1 h , and has a reduction 1 c and a bearing 1 d that is positioned downstream of the reduction 1 c . A reduction angle γ which is an opening angle of the die hole 1 h at the reduction 1 c is less than or equal to 17°, and a surface roughness Ra of the die hole 1 h within ±20 μm from a specific position inside the bearing 1 d in a circumferential direction of the die hole 1 h that is perpendicular to a wire drawing direction is less than or equal to 0.025 μm.
First claim
Opening claim text (preview).
The invention claimed is: 1. A wire drawing die comprising a non-diamond material having a die hole, a reduction, and a bearing positioned downstream of the reduction, wherein the non-diamond material includes CBN, and a reduction angle which is an opening angle of the die hole at the reduction is less than or equal to 17°, a length L of the bearing is less than or equal to 200% D, where D is a diameter of the bearing, and a surface roughness Ra of the die hole within ±20 μm from a specific position inside the bearing in a circumferential direction of the die hole that is perpendicular to a wire drawing direction is less than or equal to 0.025 μm. 2. The wire drawing die according to claim 1 , wherein the die reduces an area of a wire by greater than or equal to 5%. 3. The wire drawing die according to claim 1 , wherein the die is in initial contact with a wire on the reduction, and the die is in contact with the wire at a length greater than or equal to 50% D including the bearing, where D is the diameter of the bearing. 4. The wire drawing die according to claim 1 , wherein the die has a thermal conductivity of 100 to 300 W/(m·K). 5. The wire drawing die according to claim 1 , wherein the length L of the bearing is less than or equal to 50% D, where D is the diameter of the bearing. 6. The wire drawing die according to claim 1 , wherein the wire drawing die contains 99 mass % or more CBN and less than 1 mass % of hBN. 7. The wire drawing die according to claim 1 , wherein the crystal grain size D50 of CBN is 200 to 300 μm.
Assignees
Inventors
Classifications
Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums · CPC title
- B21C3/02Primary
Dies; Selection of material therefor; Cleaning thereof · CPC title
- B21C23/08Primary
Making wire, rods or tubes · CPC title
- B21C3/04Primary
with non-adjustable section (B21C3/08 takes precedence) · CPC title
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- What does patent US12318828B2 cover?
- A wire drawing die 1 includes a non-diamond material, is provided with a die hole 1 h , and has a reduction 1 c and a bearing 1 d that is positioned downstream of the reduction 1 c . A reduction angle γ which is an opening angle of the die hole 1 h at the reduction 1 c is less than or equal to 17°, and a surface roughness Ra of the die hole 1 h within ±20 μm from a s…
- Who is the assignee on this patent?
- Almt Corp, Sumitomo Electric Industries
- What technology area does this patent fall under?
- Primary CPC classification B21C3/02. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Jun 03 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).