Hot extrusion die for lead-nickel-copper alloy bar
By improving the structure of the hot extrusion die for lead-nickel-copper alloy bars and adopting a chamfered arc transition shape inlet and outlet and sizing belt design, the cracking problem of lead-nickel-copper alloy materials during the hot extrusion process was solved, uniform flow of the material and low-resistance extrusion were achieved, and product quality was improved.
Patent Information
- Application Number
- CN202510194593.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2025-10-17
AI Technical Summary
The feed port of traditional copper alloy bar hot extrusion die is at a right angle or with a small R angle, which causes the lead-nickel-copper alloy material to crack easily during the hot extrusion process, resulting in high extrusion pressure and high friction between the material and the die.
Improve the mold structure so that the feed and discharge ports are chamfered arc transition shapes, and the length of the sizing belt is 3mm~5mm to reduce the friction between the material and the mold.
During the hot extrusion process, friction is reduced, material flows evenly, extrusion resistance is reduced, cracking of the extruded billet is avoided, and product quality is improved.
Smart Images
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a kind of hot extrusion die of lead nickel copper alloy bar, specifically speaking, a kind of hot extrusion die with circular arc-shaped inlet and outlet, and short sizing zone, belongs to copper alloy hot extrusion die technical field. BACKGROUND
[0002] C19160 (C97) leaded nickel-copper C19160 and C19140 are unique precipitation hardening alloys containing copper, lead, nickel and phosphorus. The nickel and phosphorus in the alloy combine to form nickel phosphide, which dissolves in copper when heated to the appropriate temperature and can be retained by quenching. Subsequent aging will precipitate nickel phosphide from the solid solution in a highly dispersed manner, resulting in significant hardening and strengthening effects with excellent stress relaxation properties. Subsequent cold working further improves the strength. This type of copper alloy has the characteristics of high strength, high hardness and easy cutting.
[0003] The traditional copper alloy bar hot extrusion die inlet is a right angle or R angle is very small, when hot extruding lead nickel copper alloy material, the extrusion pressure is very large, and the extrusion blank exists cracking, extrusion cannot normally proceed.
[0004] Cracking phenomenon is a common phenomenon of nickel lead copper alloy, which is caused by unreasonable design of the die during extrusion, resulting in different extrusion pressure released by the extruded blank after extrusion, leading to cracking. And because the material itself has high hardness and high strength, the friction between the material and the die during extrusion is large, which is also the reason for the large extrusion pressure. SUMMARY
[0005] The purpose of the present application is to overcome the shortcomings of the prior art, to make corresponding improvements from the structure of the die, to reduce the friction between the material and the die, and to change the original straight angle end feeding into large chamfer feeding and circular arc transition between the sizing zone.
[0006] According to the technical scheme provided by the present application: a kind of hot extrusion die of lead nickel copper alloy bar, including die, die exists feeding port, discharge port, middle exists sizing zone, the feeding port and discharge port are chamfered circular arc transition shape.
[0007] The angle of the feeding port is 40°~60°, the angle of the discharge port is 22°~25, and the length of the sizing zone in the working area is 3mm~5mm. The present application has the following advantages: the present application reduces the friction between the lead nickel copper alloy bar and the die surface during hot extrusion, makes the flow speed of the material more uniform, and has better flowability, reduces the resistance in the hot extrusion process. By changing the structure of the die inlet and outlet, the length of the sizing zone in the working area is specified, the surface of the extruded product does not exist defect, the extrusion pressure in the extrusion process is small, and the extruded extrusion blank is qualified. BRIEF DESCRIPTION OF DRAWINGS
[0008] Fig. 1 is the structural schematic diagram of the present application Fig. 2 is the A-A sectional view of the present application.
[0009] Marked: 1, mold; 2, feed inlet; 3, discharge port; 4, sizing belt; 5, cavity. DETAILED DESCRIPTION
[0010] As Figs. 1-2 shown, a kind of lead nickel copper alloy bar hot extrusion die, including mould 1, mould 1 inside is equipped with feed inlet 2, discharge port 3, working area sizing belt 4.The feed inlet and discharge port are all chamfered shape, and it is circular arc transition between sizing belt.The angle of feed inlet is 40 °~60 °, the angle of discharge port is 22 °~25 °, and the length of working area sizing belt is:3mm~5mm. The mould of the present application works, copper ingot enters cavity 5 from feed inlet 2, is sized through sizing belt area 4, then is shaped and is discharged through discharge port 3.This time, since feed inlet 2 has chamfered shape, and it is circular arc transition between sizing belt, can make lead nickel copper alloy reduce the strong friction with the surface of mould in extrusion process, extrudes the qualified billet without cracking, and extrusion pressure is small in extrusion process.
Claims
1. A hot extrusion die for lead-nickel-copper alloy bars, characterized by: The invention comprises a mold (1), wherein the mold (1) is provided with a feed port (2), a discharge port (3), and a sizing belt (4) in a working area. The feed port (2) and the discharge port (3) are both chamfered. There is an arc transition between the feed port (2), the discharge port (3) and the sizing belt.
2. The hot extrusion die of lead-nickel-copper alloy according to claim 1, characterized in that: The angle of the feed port is in the range of 40° to 60°.
3. The hot extrusion die of lead-nickel-copper alloy according to claim 1, characterized in that: The angle of the discharge port is in the range of 22° to 25°.
4. The hot extrusion die of lead-nickel-copper alloy according to claim 1, characterized in that: Length of sizing belt in working area: 3mm~4mm.