Method for controlling bending degree of copper and copper alloy large-specification extruded bars
By controlling the temperature and pressure during the extrusion process of copper-nickel alloy large-size bars, using a specific extrusion die and die pad structure, combined with the perforated needle shearing action and cooling water tank cooling, we successfully solved the problem of difficult straightening of bent bars. problem, improving the yield rate and reducing labor intensity.
Patent Information
- Application Number
- CN202411758201.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-01-24
AI Technical Summary
BFe30-1-1 copper-nickel alloy large-sized rods are prone to bending during the extrusion process, and due to their high deformation resistance, it is difficult to straighten, resulting in the removal of the bent parts by sawing and cutting in sections during production, reducing the material yield and increasing the Labor intensity.
By controlling temperature and pressure during the heating and squeezing process of ingots, use specific extrusion molds and mold pad structures, combined with the clocking of the perforated needle shaft and cooling water sink to control the curvature of the large -specified rod.
Effectively controlled the curvature of the BFE30-1-1 large-scale rods, increased the material rate, reduced the labor intensity of employees, and solved the problem of bending difficult.
Smart Images
Figure CN119346653A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of metal material processing methods, and in particular to a method for controlling the curvature of large-size extruded bars of copper and copper alloys. Background Art
[0002] When the copper extruder extrudes large-sized bars, the large-sized bars will bend due to changes in various factors during the extrusion process, such as ingot heating temperature, extrusion pressure, extrusion speed, discharge speed, cooling time, etc. However, BFe30-1-1 copper-nickel alloy has a large deformation resistance, and its large-sized bars are difficult to straighten. In actual production, the curved parts are often removed by sawing and segmenting to meet the straightness requirements of large-sized BFe30-1-1 copper-nickel alloy bars. This method often has limitations in actual applications and can only meet products with low straightness requirements, which not only reduces the yield rate but also increases the labor intensity of employees. Summary of the invention
[0003] In view of the above technical problems, the present invention provides a method for controlling the curvature of large-sized extruded bars of copper and copper alloys.
[0004] In order to achieve the above object, the technical solution of the present invention is as follows: A method for controlling the curvature of large-size extruded copper and copper alloy bars, comprising the following steps: S1, φ440mm ingot is heated by medium frequency induction gradient, and the temperature difference of the ingot core surface is less than 30℃; S2, φ440mm ingot is upset in the extrusion cylinder, and the ingot upset pressure is set at 180bar to ensure solid upsetting; S3, the extrusion pressure is set to 180bar, the extrusion speed is set to 30mm / s, and the large-taper extrusion die with an inlet angle of 56°-60° is used to make the metal flow uniform during the extrusion process; S4. The extrusion process uses die supports and die pads with progressive apertures to strengthen the restraining effect of die supports and die pads on large-sized bars. The die pads are equipped with inner sleeves to adapt to the extrusion of different large-sized bars. The die pad discharge hole is provided with a slideway, and the inner sleeve is provided with a slider to ensure better positioning and connection between the die pad and the inner sleeve; S5. Use the piercing needle shearing action to separate the large-sized rod from the extrusion die. The outer diameter of the piercing needle is selected to be 1 / 2 + (5-10) mm of the outer diameter of the rod, and the shearing distance is 25-30 mm. S6. After the large-sized bars are separated from the extrusion die, they are cooled in the cooling water tank for more than 5 minutes and then lifted out of the material by rollers.
[0005] Wherein, in step S3, the extrusion die lubrication method is 20% graphite and 75% asphalt lubrication.
[0006] Among them, in the step S4, the inner diameter of the die pad discharge hole in the middle part is 5-10mm larger than the outer diameter of the die support, and the inner diameter of the die pad discharge hole at the rear part is 5-10mm larger than the inner diameter of the die pad discharge hole in the middle part.
[0007] Wherein, in step S5, the perforating needle is lubricated with pure asphalt.
[0008] The beneficial effects of the present invention are as follows: the present invention solves the production technical difficulties that the BFe30-1-1 copper-nickel alloy has large deformation resistance and its large-size bars are difficult to straighten, and realizes effective control of the curvature of the large-size BFe30-1-1 bars. Compared with the existing production method, the present invention improves the yield rate and reduces the labor intensity of employees. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a schematic structural diagram of the mold pad of the invention.
[0010] Figure 2 It is a structural schematic diagram of the inner sleeve of the invention. DETAILED DESCRIPTION
[0011] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.
[0012] Example 1 A method for controlling the curvature of large-size extruded copper and copper alloy bars, comprising the following steps: S1, φ440mm ingot is heated by medium frequency induction gradient, and the temperature difference of the ingot core surface is less than 30℃; S2, φ440mm ingot is upset in the extrusion cylinder, and the ingot upset pressure is set at 180bar to ensure solid upsetting; S3, the extrusion pressure is set to 180bar, the extrusion speed is set to 30mm / s, and the large taper extrusion die with an inlet angle of 56° is used to make the metal flow uniform during the extrusion process; S4. The extrusion process uses die supports and die pads 1 with progressive apertures to strengthen the restraint effect of die supports and die pads 1 on large-size bars, such as Figure 1 and Figure 2 As shown, the die pad 1 is equipped with an inner sleeve 3 to adapt to the extrusion of different large-sized bars. The discharge hole of the die pad 1 is provided with a slideway 2, and the inner sleeve 3 is provided with a slider 4 to ensure better positioning and connection between the die pad 1 and the inner sleeve 3; S5. Use the piercing needle shearing action to separate the large-sized bar from the extrusion die. The outer diameter of the piercing needle is selected to be 1 / 2+5mm of the outer diameter of the bar, and the shearing distance is 25mm. S6. After the large-sized bars are separated from the extrusion die, they are cooled in the cooling water tank for more than 5 minutes and then lifted out of the material by rollers.
[0013] Wherein, in step S3, the extrusion die lubrication method is 20% graphite and 75% asphalt lubrication.
[0014] Among them, in the step S4, the inner diameter of the discharge hole of the middle mold pad 1 is 5 mm larger than the outer diameter of the mold support, and the inner diameter of the discharge hole of the rear mold pad 1 is 5 mm larger than the inner diameter of the discharge hole of the middle mold pad 1.
[0015] Wherein, in step S5, the perforating needle is lubricated with pure asphalt.
[0016] Example 2 A method for controlling the curvature of large-size extruded copper and copper alloy bars, comprising the following steps: S1, φ440mm ingot is heated by medium frequency induction gradient, and the temperature difference of the ingot core surface is less than 30℃; S2, φ440mm ingot is upset in the extrusion cylinder, and the ingot upset pressure is set at 180bar to ensure solid upsetting; S3, the extrusion pressure is set to 180bar, the extrusion speed is set to 30mm / s, and the large taper extrusion die with an inlet angle of 60° is used to make the metal flow uniform during the extrusion process; S4. The extrusion process uses die supports and die pads 1 with progressive apertures to strengthen the restraint effect of die supports and die pads 1 on large-size bars, such as Figure 1 and Figure 2 As shown, the die pad 1 is equipped with an inner sleeve 3 to adapt to the extrusion of different large-sized bars. The discharge hole of the die pad 1 is provided with a slideway 2, and the inner sleeve 3 is provided with a slider 4 to ensure better positioning and connection between the die pad 1 and the inner sleeve 3; S5. Use the piercing needle shearing action to separate the large-sized rod from the extrusion die. The outer diameter of the piercing needle is selected to be 1 / 2+10mm of the outer diameter of the rod, and the shearing distance is 30mm. S6. After the large-sized bars are separated from the extrusion die, they are cooled in the cooling water tank for more than 5 minutes and then lifted out of the material by rollers.
[0017] Wherein, in step S3, the extrusion die lubrication method is 20% graphite and 75% asphalt lubrication.
[0018] Among them, in the step S4, the inner diameter of the discharge hole of the middle mold pad 1 is 10mm larger than the outer diameter of the mold support, and the inner diameter of the discharge hole of the rear mold pad 1 is 10mm larger than the inner diameter of the discharge hole of the middle mold pad 1.
[0019] Wherein, in step S5, the perforating needle is lubricated with pure asphalt.
[0020] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.
Claims
1. A method for controlling the curvature of large-size extruded copper and copper alloy bars, characterized in that: The following steps are involved: S1, φ440mm ingot is heated by medium frequency induction gradient, and the temperature difference of the ingot core surface is less than 30℃; S2, φ440mm ingot is upset in the extrusion cylinder, and the ingot upset pressure is set at 180bar to ensure solid upsetting; S3, the extrusion pressure is set to 180bar, the extrusion speed is set to 30mm / s, and the large-taper extrusion die with an inlet angle of 56°-60° is used to make the metal flow uniform during the extrusion process; S4. During the extrusion process, a die support and a die pad (1) with progressive apertures are used to strengthen the restraining effect of the die support and the die pad (1) on large-sized bars. The die pad (1) is provided with an inner sleeve (3) to adapt to the extrusion of bars of different large sizes. The discharge hole of the die pad (1) is provided with a slideway (2), and the inner sleeve (3) is provided with a slider (4) to ensure better positioning and connection between the die pad (1) and the inner sleeve (3); S5. Use the piercing needle shearing action to separate the large-sized rod from the extrusion die. The outer diameter of the piercing needle is selected to be 1 / 2 + (5-10) mm of the outer diameter of the rod, and the shearing distance is 25-30 mm. S6. After the large-sized bars are separated from the extrusion die, they are cooled in the cooling water tank for more than 5 minutes and then lifted out of the material by rollers.
2. The method for controlling the curvature of large-size extruded copper and copper alloy bars according to claim 1, characterized in that: In step S3, the extrusion die is lubricated with 20% graphite and 75% asphalt.
3. The method for controlling the curvature of large-size extruded copper and copper alloy bars according to claim 1, characterized in that: In the step S4, the inner diameter of the discharge hole of the middle mold pad (1) is 5-10 mm larger than the outer diameter of the mold support, and the inner diameter of the discharge hole of the rear mold pad (1) is 5-10 mm larger than the inner diameter of the discharge hole of the middle mold pad (1).
4. The method for controlling the curvature of large-size extruded copper and copper alloy bars according to claim 1, characterized in that: In step S5, the perforating needle is lubricated with pure asphalt.