Milling process of aluminum alloy wire sub bullet type ingot

Abstract

The application discloses a milling process of a bullet-shaped ingot of an aluminum alloy welding wire and belongs to the field of aluminum alloy ingot processing. The application solves the technical problems of existing methods, such as rolling cracking and low product yield, of a 5-series alloy hot continuous rolling bar ingot. The milling process of the bullet-shaped ingot comprises the following steps: sequentially performing ingredient preparation, smelting, casting and sawing to form a bar ingot; the bar ingot is milled by a milling machine, the diameter of the bar ingot after milling is d; one end of the bar ingot is selected, and taper angle milling is performed with the bar shaft as a reference, an end face circle with a radius n is reserved as an origin during the taper angle milling, and the length of the taper angle milling is m; the ratio n / d of the radius n of the reserved end face circle to the diameter d of the bar ingot after milling is in the range of 0.34 to 0.35, the ratio m / n of the length m of the taper angle milling to the radius n of the reserved end face circle is 0.5, and a bullet-shaped ingot is formed. The application is used for aluminum alloy ingot processing.

Description

Technical Field

[0001] This invention relates to the milling process of bullet-shaped aluminum alloy welding wire ingots, and belongs to the field of aluminum alloy ingot processing. Background Technology

[0002] 5-series alloy welding wire is widely used in aerospace and large shipbuilding. With the successful development of key national large aircraft and large ships, my country has achieved technological breakthroughs in related fields. 5-series aluminum alloys are typical aluminum-magnesium alloys with rust-resistant properties. Among many aluminum alloys, they possess high strength, corrosion resistance, and good weldability. In some important structures, they can replace steel in lightweight structures of aircraft and spacecraft, significantly reducing the overall weight of structural components. Welding aluminum plates with 5-series alloy welding wire can reduce the weight of the aircraft fuselage by nearly 20% and increase the strength of the connecting parts by approximately 20%. Hot-rolled wire rod welding wire production is a new technology that, compared to extrusion technology, can significantly reduce the production cycle, improve production efficiency, and create substantial economic benefits.

[0003] In existing methods for rolling 5-series alloy hot-rolled bars, the cylindrical shape at the front end of the aluminum alloy bar is subjected to uneven stress during the rolling process, which leads to cracking and a low yield.

[0004] Existing methods for rolling 5-series alloy hot-rolled bar ingots suffer from technical problems such as rolling cracking and low yield. Summary of the Invention

[0005] The present invention aims to solve the technical problems of rolling cracking and low yield in existing methods for rolling 5-series alloy hot continuous rolled bar ingots, and to provide a milling process for aluminum alloy welding wire bullet-shaped ingots.

[0006] The technical solution of the present invention includes the following steps:

[0007] Step 1: According to the set proportions for bar ingots, proceed with batching, smelting, casting, sawing, and casting to form bar ingots.

[0008] Step 2: The bar ingot is milled by a milling machine, and the diameter of the bar ingot after milling is d;

[0009] Step 3: Select one end of the bar ingot and perform conical milling with the bar's axis as the reference. During conical milling, retain an end face circle with the center of the end face as the origin and a radius of n. The length of the conical milling is m. The ratio of the radius n of the end face circle retained during conical milling to the diameter d of the bar ingot after milling, n / d, is in the range of 0.34 to 0.35. The ratio of the length m of the conical milling to the radius n of the end face circle retained during conical milling, m / n = 0.5.

[0010] Step four: After taper milling, a bullet-shaped ingot is formed, completing the milling process.

[0011] As another improvement of the present invention, the diameter of the cast bar ingot in step one is 150mm and the length of the cast bar ingot is 3m.

[0012] As another improvement of the present invention, in step three, the axial center of both ends of the bar ingot is clamped, and the initial feed rate for the taper milling is 20mm.

[0013] As another improvement of the present invention, in step two, the milling machine removes the oxide scale from the surface of the bar ingot in one milling operation, and the diameter d of the bar ingot after milling is 145mm.

[0014] As another improvement of the present invention, the radius n of the end face circle retained during the conical milling in step three is 50mm, and the length m of the conical milling is 25mm.

[0015] As another improvement of the present invention, the melting temperature ranges from 725°C to 760°C.

[0016] As another improvement of the present invention, the casting temperature ranges from 680°C to 700°C.

[0017] The beneficial effects of this invention are:

[0018] 1. The milling process for bar ingots has been optimized and updated to obtain bullet-shaped ingots, avoiding cracking during the rolling process and improving the yield.

[0019] 2. By constraining the milling process by the ratio of the length of the taper milling to the radius of the end face circle retained during taper milling, the process can be easily applied to bar ingots of different shapes. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a bullet-shaped ingot produced by the milling process of the aluminum alloy welding wire bullet-shaped ingot of the present invention.

[0021] Figure 2 This is a schematic diagram of bar stock casting. Detailed Implementation

[0022] Specific implementation method one: Combining Figure 1 and Figure 2 This embodiment describes the following steps:

[0023] Step 1: According to the set proportions for 5-series alloy bar ingots, the materials are batched, smelted, cast, and sawn to form bar ingots. In actual production, hot rolling can be carried out after the sawing step.

[0024] Step 2: The bar ingot is milled by a milling machine, and the diameter of the bar ingot after milling is d;

[0025] Step 3: Select one end of the bar ingot and perform conical milling with the bar's axis as the reference. During conical milling, retain an end face circle with the center of the end face as the origin and a radius of n. The length of the conical milling is m. The ratio of the radius n of the end face circle retained during conical milling to the diameter d of the bar ingot after milling, n / d, is in the range of 0.34 to 0.35. The ratio of the length m of the conical milling to the radius n of the end face circle retained during conical milling, m / n = 0.5.

[0026] Step four: After taper milling, a bullet-shaped ingot is formed, completing the milling process.

[0027] The milling process for 5-series alloy bar ingots has been optimized and updated to produce bullet-shaped ingots, avoiding cracking during rolling and improving yield. By constraining the milling process with the ratio of the length of the taper milling to the radius of the end face circle retained during taper milling, the process can be easily applied to bar ingots of different shapes.

[0028] Specific Implementation Method Two: Combining Figures 1 to 2 This embodiment differs from Specific Embodiment 1 in that the diameter of the cast bar ingot in step one is 150mm, and the length of the cast bar ingot is 3m. During processing, defects such as scratches, cold shuts, and shrinkage cavities with a depth not exceeding 1.5mm are permissible on the surface of the bar ingot.

[0029] Specific implementation method three: Combining Figures 1 to 2 This embodiment differs from Specific Embodiment One in that, in step three, the axial centers at both ends of the bar ingot are clamped, and the initial feed rate for tapered milling is 20mm. This is to ensure machining accuracy.

[0030] Specific implementation method four: Combination Figures 1 to 2 This embodiment differs from Specific Embodiment 1 in that, in step two, the milling machine removes the oxide scale from the surface of the bar ingot in one milling operation, and the diameter d of the bar ingot after milling is 145 mm.

[0031] Specific Implementation Method Five: Combining Figures 1 to 2 This embodiment differs from Specific Embodiment 1 in that, in step three, the radius n of the end face circle retained during conical milling is 50mm, and the length m of the conical milling is 25mm. This satisfies the range of the ratio between the length of the conical milling and the radius of the end face circle retained during conical milling.

[0032] Specific Implementation Method Six: This implementation method differs from Specific Implementation Method One in that the melting temperature range in step one is 725℃ to 760℃. The purpose is to obtain a uniformly distributed melt.

[0033] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Method One in that the casting temperature range in step one is 680℃ to 700℃. Its purpose is to cast the ingot.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A milling process for bullet-shaped aluminum alloy welding wire ingots, characterized in that... It includes the following steps: Step 1: According to the set proportions for bar ingots, proceed with batching, smelting, casting, sawing, and casting to form bar ingots. Step 2: The bar ingot is milled by a milling machine, and the diameter of the bar ingot after milling is d; Step 3: Select one end of the bar ingot and perform conical milling with the bar's axis as the reference. During conical milling, retain an end face circle with the center of the end face as the origin and a radius of n. The length of the conical milling is m. The ratio of the radius n of the end face circle retained during conical milling to the diameter d of the bar ingot after milling, n / d, ranges from 0.34 to 0.

35. The ratio of the length m of the conical milling to the radius n of the end face circle retained during conical milling, m / n = 0.

5. Step four: After taper milling, a bullet-shaped ingot is formed, completing the milling process; In step three, the axial center of both ends of the bar ingot is clamped, and the initial feed rate for taper milling is 20mm.

2. The milling process for the aluminum alloy welding wire bullet-shaped ingot according to claim 1, characterized in that... In step one, the diameter of the cast bar ingot is 150mm and the length of the cast bar ingot is 3m.

3. The milling process for the aluminum alloy welding wire bullet-shaped ingot according to claim 1, characterized in that, In step two, the milling machine removes the oxide scale from the surface of the bar ingot in one milling operation. The diameter d of the bar ingot after milling is 145 mm.

4. The milling process for the aluminum alloy welding wire bullet-shaped ingot according to claim 1, characterized in that, In step three, the radius n of the end face circle retained during taper milling is 50mm, and the length m of the taper milling is 25mm.

5. The milling process for the aluminum alloy welding wire bullet-shaped ingot according to claim 1, characterized in that, The melting temperature in step one ranges from 725°C to 760°C.

6. The milling process for the aluminum alloy welding wire bullet-shaped ingot according to claim 1, characterized in that, The casting temperature range in step one is 680℃ to 700℃.

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