Preparation method of large-size titanium alloy cast ingot containing copper element

Abstract

The invention discloses a preparation method of a large-size titanium alloy cast ingot containing a copper element, which comprises the following steps: step 1, preparing raw materials: according to the components of a target titanium alloy cast ingot, the raw materials comprise a titanium part, sponge titanium and a copper part, the content of titanium is 90.4-91.8%, and the content of copper is 7.8-9%; 2, electrode blocks are pressed, specifically, the titanium sponge prepared in the step 1 is loaded into a mold and pressed on an oil press, and a plurality of electrode blocks are obtained; 3, material distribution is conducted, specifically, the titanium workpiece, the copper workpiece and the electrode block obtained in the step 2 are distributed on an electron beam cold bed furnace according to a set mode; and 4, electron beam cold bed furnace smelting is conducted, specifically, the titanium workpiece, the copper workpiece and the electrode block which are subjected to material distribution in the step 3 are fed into the electron beam cold bed furnace and smelted according to set smelting parameters, cooling is conducted after smelting is completed, and the target titanium alloy cast ingot is obtained. The cast ingot is uniform in component.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium alloy preparation, and in particular relates to a method for preparing a large-size titanium alloy ingot containing copper elements. Background Art

[0002] Titanium and titanium alloys are widely used in aerospace, medical and daily necessities due to their light texture, high specific strength, good biocompatibility and excellent corrosion resistance. At present, most clinical implant materials are made of pure titanium and general titanium alloys, which can cause bacterial infection after surgery. Adding Cu to pure titanium can play an antibacterial function and meet the requirements of antibacterial in certain environments where bacteria are prone to grow. However, when an electron beam melting furnace is used to prepare large-sized titanium alloy ingots containing copper, the distribution coefficient K of copper in titanium alloys is 0.2, which is much less than 1. Therefore, it is shown that the Cu element has a great tendency of crystallization segregation during the smelting process, and the composition of the ingot is uneven.

[0003] In view of this, the inventors provide a method for preparing a large-sized titanium alloy ingot containing copper elements to solve the above technical problems. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to propose a method for preparing a large-sized titanium alloy ingot containing copper elements. By improving the distribution method of electrode blocks and copper plates and the smelting process, the problems of ingot composition unevenness and composition segregation caused by severe volatilization of Cu elements are solved.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a method for preparing a large-sized titanium alloy ingot containing copper elements, comprising the following steps:

[0007] Step 1, preparing raw materials: according to the composition of the target titanium alloy ingot, the raw materials include titanium parts, sponge titanium, and copper parts, wherein the content of titanium is 90.4% to 91.8% and the content of copper is 7.8% to 9% by weight;

[0008] Step 2, pressing electrode blocks: loading the titanium sponge prepared in step 1 into a mold, and pressing the titanium sponge on a hydraulic press to obtain a plurality of electrode blocks;

[0009] Step 3, laying out: Laying out the titanium parts, copper parts and the electrode blocks obtained in step 2 on the electron beam cooling furnace according to the set method;

[0010] Step 4, electron beam cooling furnace smelting: the titanium parts, copper parts and electrode blocks prepared in step 3 are sent into the smelting chamber of the electron beam cooling furnace, and smelted according to the set smelting parameters. After the smelting is completed, the parts are cooled to obtain the target titanium alloy ingot.

[0011] Further preferably, in step 2, the electrode block pressed and formed is a square electrode block, because the feed trough of the electron beam cooling hearth furnace is a square structure, and combined with the requirements of the electron beam cooling hearth furnace feeding system for electrode blocks, the square shape is optimal.

[0012] Furthermore, the holding time of each electrode block is 30s to 60s, and the density of the pressed electrode block is 3.40g / cm 3 ~3.60g / cm 3 ;

[0013] Furthermore, in step 1, the titanium part is a pure titanium plate; the sponge titanium includes 0A grade low-iron and low-oxygen sponge titanium from the same batch or different batches; and the copper part is a copper plate.

[0014] Furthermore, the specific process of step 3 is as follows:

[0015] Step 3.1, placing a pure titanium plate on the cooling bed of the electron beam cooling bed furnace to prevent the copper plate from sticking to the cooling bed during the smelting process;

[0016] Step 3.2, arrange a layer of copper plate on the upper surface of the pure titanium plate, and then select at least one electrode block and place it on the copper plate so that the electrode block completely covers the copper plate;

[0017] Among them, the weight of one layer of copper plate accounts for 8.07% to 10.17% of the total copper plate weight;

[0018] Step 3.3, arranging the electrode block layer-copper plate layer-electrode block layer in an alternating manner in the feed trough;

[0019] The electrode block layer is composed of a plurality of electrode blocks; the copper plate layer is composed of copper plates, and the weight of the copper plates accounts for 89.83% to 91.93% of the total weight of the copper plates.

[0020] Further preferably, the copper part is a T2 copper plate, and the chemical composition content of the T2 copper plate is: Cu content is not less than 99.986wt.%, Bi content is not more than 0.0005wt.%, Fe content is not more than 0.002wt.%, Pb content is not more than 0.0028wt.%, Sb content is not more than 0.0005wt.%, As content is not more than 0.005wt.%, and S content is not more than 0.3wt.%.

[0021] Furthermore, step 4 comprises the following steps:

[0022] Step 4.1, check the electron beam cooling furnace, including the vacuum degree of the melting chamber, the gas leakage rate of the melting chamber and the vacuum degree of the ingot pulling chamber;

[0023] Step 4.2: After the electron beam cooling bed furnace is checked to be normal, start the electron beam cooling bed power supply, and start the 1# to 7# electron guns in sequence, and then the feed chute starts pushing the material for melting.

[0024] Furthermore, in step 4.1, the vacuum degree of the smelting chamber is ≤1Pa, the air leakage rate of the smelting chamber is ≤0.3Pa / min, and the vacuum degree of the ingot pulling chamber is ≤1Pa.

[0025] Furthermore, in step 4.2, the current of the 1# to 5# electron guns is 4.0A to 10.0A, and the current of the 6# and 7# electron guns is 2.5A to 8.0A.

[0026] Furthermore, in step 4.2, during the smelting process, the vacuum degree of the smelting chamber is set to ≤10Pa, the smelting voltage is 29.5KV to 30KV, the smelting current is 4.0A to 10.0A, and the smelting speed is 380kg / h to 440kg / h.

[0027] Furthermore, during smelting, when the unmelted raw materials account for 1 / 6 to 1 / 5 of the total raw material mass, the 6# and 7# electron guns are fed with a feeding current of 2.5A to 8.0A.

[0028] Furthermore, in step 4, the cooling time is ≥ 8h.

[0029] During the smelting process, select the appropriate electron beam scanning pattern according to the process requirements, feed evenly according to the principle of "small amounts and multiple times", adjust the feeding and ingot pulling speed according to the situation in the furnace, ensure smooth flow of molten liquid in the pouring channel and cooling bed, and prevent overheating of the molten pool, accumulation of raw materials, obstruction of molten liquid flow, and overflow of molten liquid from the crucible or cooling bed. The raw materials are melted and refined on the cooling bed, and then the molten liquid flows into the crucible through the pouring channel. The liquid molten liquid in the crucible is gradually solidified from bottom to top into an ingot, and slowly moves downward into the vacuum casting chamber to form an ingot under the action of the ingot pulling system.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention provides a method for preparing a large-scale titanium alloy ingot containing copper elements. The method of distributing electrode blocks and copper plates is innovatively improved, and an arrangement method of electrode blocks clamping copper plates is adopted, which not only ensures uniform composition and improves distribution efficiency, but also effectively reduces component segregation. At the same time, a breakthrough is made in the smelting process, and the smelting current, smelting voltage and smelting speed are accurately controlled, which further improves the uniformity and quality of the ingot, solves the problem of difficulty in controlling the uniformity of large-scale titanium alloy ingots containing Cu elements produced by electron beam melting furnaces, and can effectively control the composition uniformity of the Cu element, so that large-scale titanium alloy ingots containing Cu elements can be industrialized and cost-effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the present invention.

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0034] Figure 1 The present invention is a flow chart of a method for preparing a large-sized titanium alloy ingot containing copper element;

[0035] Figure 2 Schematic diagram of material distribution on a cooling bed when preparing a large-sized titanium alloy ingot containing copper element according to the present invention Figure 1 ;

[0036] Figure 3 Schematic diagram of material distribution on a cooling bed when preparing a large-sized titanium alloy ingot containing copper element according to the present invention Figure 2 ;

[0037] Figure 4 A side view of the material distribution on the feed trough when preparing a large-sized titanium alloy ingot containing copper elements according to the present invention. DETAILED DESCRIPTION

[0038] Here, exemplary embodiments will be described in detail, and the embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples consistent with some aspects of the present invention described in detail in the appended claims.

[0039] Example 1

[0040] See also Figure 1 to Figure 4 This embodiment provides a method for preparing a large-sized titanium alloy ingot containing copper elements, comprising the following steps:

[0041] Step 1, prepare raw materials: select 0A grade low iron and low oxygen sponge titanium, T2 copper plate and pure titanium plate that meet the national standard GB / T 2524-2019 as raw materials, wherein the content of titanium is 91.8% and the content of copper is 7.8% by weight;

[0042] Step 2, pressing the electrode blocks: the titanium sponge prepared in step 1 is loaded into a mold, and the titanium sponge is pressed on an 8000-ton hydraulic press. The holding time of each electrode block is 30 seconds, and 44 square electrode blocks with a specification of 400mm*290mm*100mm are obtained;

[0043] Step 3, laying: Lay the pure titanium plate, T2 copper plate and the electrode block obtained in step 2 on the electron beam cooling furnace according to the set method;

[0044] Step 4, electron beam cooling furnace smelting: the pure titanium plate, T2 copper plate and electrode block prepared in step 3 are sent into the smelting chamber of the electron beam cooling furnace, and smelted according to the set smelting parameters. After the smelting is completed, the target titanium alloy ingot is obtained by cooling.

[0045] The specific process of step 3 is as follows:

[0046] Step 3.1: Place a 20kg pure titanium plate on the cooling bed of the electron beam cooling furnace to prevent the T2 copper plate from sticking to the cooling bed during the smelting process. Figure 2 As shown; specifically, the cooling bed size is 450*1780mm;

[0047] Step 3.2: Place a layer of T2 copper plate on the upper surface of the pure titanium plate, and then select 4 electrode blocks and place them on the T2 copper plate so that the electrode blocks completely cover the T2 copper plate. Figure 2 , 3 As shown;

[0048] Wherein, in step 3.2, the weight of a layer of T2 copper plate arranged on the upper surface of the pure titanium plate accounts for 8.07% of the total weight of the T2 copper plate.

[0049] Step 3.3, in the two feed troughs, the electrode block layer-copper plate layer-electrode block layer are arranged alternately, such as Figure 4 As shown;

[0050] Among them, in step 3.3, the size of each feed trough is 500*820mm, and the distance between both sides of all electrode block layers and copper plate layers and the feed trough is about 10mm; each electrode block layer is composed of 10 electrode blocks; the copper plate layer is composed of T2 copper plates, and its weight accounts for 91.93% of the total T2 copper plate weight.

[0051] Further, step 4 includes the following steps:

[0052] Step 4.1, check the electron beam cooling furnace, including the vacuum degree of the melting chamber, the gas leakage rate of the melting chamber and the vacuum degree of the ingot pulling chamber;

[0053] Step 4.2: After the electron beam cooling bed furnace is checked to be normal, start the electron beam cooling bed power supply, and start the 1# to 7# electron guns in sequence, and then the feed chute starts pushing the material for melting.

[0054] Wherein, in step 4.1, the vacuum degree of the smelting chamber is ≤1Pa, the air leakage rate of the smelting chamber is ≤0.3Pa / min, and the vacuum degree of the ingot pulling chamber is ≤1Pa.

[0055] In step 4.2, the current of the 1# to 5# electron guns is 4.0A to 7.0A, and the current of the 6# and 7# electron guns is 5.0A to 7.0A.

[0056] Furthermore, in step 4.2, during the smelting process, the vacuum degree of the smelting chamber is set to ≤10Pa, the smelting voltage is 30KV, the smelting current is 4.0A-7.0A, and the smelting speed is 380kg / h.

[0057] Furthermore, during smelting, when the unmelted raw materials account for 1 / 5 of the total raw material mass, the 6# and 7# electron guns are fed, and the feeding current is 5.0A to 7.0A.

[0058] Furthermore, after cooling is completed, the ingot is cooled for 8 hours to obtain a large-sized titanium alloy ingot containing copper elements with uniform composition, the size of which is 2200mm*1200mm*100mm.

[0059] In order to illustrate the effect of this embodiment, this embodiment tested the large-scale titanium alloy ingot containing copper element prepared, as follows:

[0060] (1) The titanium alloy ingot was peeled, and then flaw detection was performed at the riser. 15 points were taken on each of the A surface (the surface close to the runner was marked as the A surface) and the B surface (the other surface corresponding to the A surface was marked as the B surface). The sampling points of the A surface were marked as A1, A2, A3, ..., A15, and the sampling points of the B surface were marked as B1, B2, B3, ..., B15. The Cu element content test results of all the sampling points are shown in Table 1. The titanium alloy ingot was sawed to obtain five sawn surfaces. Five sampling points were taken on each of the five sawn surfaces to detect the Cu element content, as shown in Table 2.

[0061] Table 1 Chemical composition of Cu element on ingot surface (mass percentage %)

[0062] Sampling location A-side Cu element Sampling location B-side Cu element A 1 2.58 B 1 2.63 A 2 3.01 B 2 3.54 A 3 2.58 B 3 2.35 A 4 2.6 B 4 2.13 A 5 4.05 B 5 4.11 A 6 2.85 B 6 3.42 A 7 3.41 B 7 3.12 A 8 3.16 B 8 3.22 A 9 3.51 B 9 2.37 A 10 2.97 B 10 2.80 A 11 2.89 B 11 3.33 A 12 2.93 B 12 1.55 A 13 2.36 B 13 1.94 A 14 2.74 B 14 3.10 A 15 2.5 B 15 2.01

[0063] Table 2 Cu element content on sawn surface

[0064] Position content Point 1 (wt.%) Point 2 (wt.%) Point 3 (wt.%) Point 4 (wt.%) Point 5 (wt.%) First sawing surface 3.31 3.2 3.3 3.05 2.96 Second sawing surface 4.39 4.36 3.39 4.55 4.62 The third sawing surface 3.90 3.82 3.64 3.79 3.82 Fourth sawing surface 3.04 3.17 3.23 3.13 3.05 Fifth sawing surface 3.11 3.22 3.08 3.23 3.13

[0065] Example 2

[0066] See also Figure 1 to Figure 4 This embodiment provides a method for preparing a large-sized titanium alloy ingot containing copper elements, comprising the following steps:

[0067] Step 1, preparing raw materials: selecting 0A grade low iron and low oxygen sponge titanium, T2 copper plate and pure titanium plate with batch numbers H26-240416-A and H26-240469-A as raw materials, wherein the content of titanium is 91.8% and the content of copper is 8% by weight;

[0068] Step 2: Pressing the electrode blocks: Put the titanium sponge prepared in step 1 into the mold and press the titanium sponge on an 8000-ton hydraulic press. The holding time of each electrode block is 30 seconds. 44 square electrode blocks with a size of 400mm*290mm*100mm are obtained. The density of the electrode blocks is 3.40g / cm 3 ~3.60g / cm 3 ;

[0069] Step 3, laying: Lay the pure titanium plate, T2 copper plate and the electrode block obtained in step 2 on the electron beam cooling furnace according to the set method;

[0070] Step 4, electron beam cooling furnace smelting: the pure titanium plate, T2 copper plate and electrode block prepared in step 3 are sent into the electron beam cooling furnace, and smelted according to the set smelting parameters. After the smelting is completed, the target titanium alloy ingot is obtained by cooling.

[0071] The specific process of step 3 is as follows:

[0072] Step 3.1: Place a 20.8 kg pure titanium plate on the cooling bed of the electron beam cooling furnace to prevent the T2 copper plate from sticking to the cooling bed during the smelting process. Figure 2 As shown; specifically, the cooling bed size is 450*1780mm;

[0073] Step 3.2: Place a layer of T2 copper plate on the upper surface of the pure titanium plate, and then select 4 electrode blocks and place them on the T2 copper plate so that the electrode blocks completely cover the T2 copper plate. Figure 2 , 3 As shown;

[0074] Wherein, in step 3.2, the weight of a layer of T2 copper plate arranged on the upper surface of the pure titanium plate accounts for 9% of the total weight of the T2 copper plate.

[0075] Step 3.3, in the two feed troughs, the electrode block layer-copper plate layer-electrode block layer are arranged alternately, such as Figure 4 As shown;

[0076] Among them, in step 3.3, the size of each feed trough is 500*820mm, and the distance between both sides of all electrode block layers and copper plate layers and the feed trough is about 10mm; each electrode block layer is composed of 10 electrode blocks; the copper plate layer is composed of T2 copper plates, and its weight accounts for 90.93% of the total T2 copper plate weight.

[0077] Further, step 4 includes the following steps:

[0078] Step 4.1, check the electron beam cooling furnace, including the vacuum degree of the melting chamber, the gas leakage rate of the melting chamber and the vacuum degree of the ingot pulling chamber;

[0079] Step 4.2: After the electron beam cooling bed furnace is checked to be normal, start the electron beam cooling bed power supply, and start the 1# to 7# electron guns in sequence, and then the feed chute starts pushing the material for melting.

[0080] Wherein, in step 4.1, the vacuum degree of the smelting chamber is ≤1Pa, the air leakage rate of the smelting chamber is ≤0.3Pa / min, and the vacuum degree of the ingot pulling chamber is ≤1Pa.

[0081] In step 4.2, the current of the 1# to 5# electron guns is 5.0A to 7.0A, and the current of the 6# and 7# electron guns is 6.5A to 7.5A.

[0082] Furthermore, in step 4.2, during the smelting process, the vacuum degree of the smelting chamber is set to ≤10Pa, the smelting voltage is 30KV, the smelting current is 5.0A-7.0A, and the smelting speed is 420kg / h.

[0083] Furthermore, during smelting, when the unmelted raw materials account for 1 / 6 of the total raw material mass, the 6# and 7# electron guns are fed, and the feeding current is 6.5A to 7.5A.

[0084] Furthermore, after cooling is completed, the ingot is cooled for 9 hours to obtain a large-sized titanium alloy ingot containing copper elements with uniform composition, the size of which is 2200mm*1200mm*100mm.

[0085] In order to illustrate the effect of this embodiment, this embodiment tested the large-scale titanium alloy ingot containing copper element prepared, as follows:

[0086] (1) The titanium alloy ingot was peeled, and then the riser was inspected. The titanium alloy ingot was sawn on the A side (the side close to the runner was marked as the A side) and the B side (the other side corresponding to the A side was marked as the B side) to obtain six sawn surfaces. Samples were taken from the six sawn surfaces to detect the content of Cu, Fe, and O elements. The sampling numbers were marked as J1-1, J1-2, …, J1-5. The test results are shown in Table 3.

[0087] Table 3 Saw surface data

[0088]

[0089]

[0090] Example 3

[0091] See also Figure 1 to Figure 4 This embodiment provides a method for preparing a large-sized titanium alloy ingot containing copper elements, comprising the following steps:

[0092] Step 1, prepare raw materials: select 0A grade low iron and low oxygen sponge titanium, T2 copper plate and pure titanium plate that meet the national standard GB / T5231-2022 as raw materials, wherein the content of titanium is 90.4% and the content of copper is 9% by weight;

[0093] Step 2: Pressing the electrode blocks: Put the titanium sponge prepared in step 1 into the mold and press the titanium sponge on an 8000-ton hydraulic press. The holding time of each electrode block is 60 seconds. 44 square electrode blocks with a size of 400mm*290mm*100mm are obtained. The density of the electrode blocks is 3.40g / cm 3 ~3.60g / cm 3 ;

[0094] Step 3, laying: Lay the pure titanium plate, T2 copper plate and the electrode block obtained in step 2 on the electron beam cooling furnace according to the set method;

[0095] Step 4, electron beam cooling furnace smelting: the pure titanium plate, T2 copper plate and electrode block prepared in step 3 are sent into the electron beam cooling furnace, and smelted according to the set smelting parameters. After the smelting is completed, the target titanium alloy ingot is obtained by cooling.

[0096] The specific process of step 3 is as follows:

[0097] Step 3.1: Place a 20kg pure titanium plate on the cooling bed of the electron beam cooling furnace to prevent the T2 copper plate from sticking to the cooling bed during the smelting process. Figure 2 As shown; specifically, the cooling bed size is 450*1780mm;

[0098] Step 3.2: Place a layer of T2 copper plate on the upper surface of the pure titanium plate, and then select 4 electrode blocks and place them on the T2 copper plate so that the electrode blocks completely cover the T2 copper plate. Figure 2 , 3 As shown;

[0099] Wherein, in step 3.2, the weight of a layer of T2 copper plate arranged on the upper surface of the pure titanium plate accounts for 10.17% of the total weight of the T2 copper plate.

[0100] Step 3.3, in the two feed troughs, the electrode block layer-copper plate layer-electrode block layer are arranged alternately, such as Figure 4 As shown;

[0101] Among them, in step 3.3, the size of each feed trough is 500*820mm, and the distance between both sides of all electrode block layers and copper plate layers and the feed trough is about 10mm; each electrode block layer is composed of 10 electrode blocks; the copper plate layer is composed of T2 copper plates, and its weight accounts for 89.83% of the total T2 copper plate weight.

[0102] Furthermore, step 4 includes the following steps:

[0103] Step 4.1, check the electron beam cooling furnace, including the vacuum degree of the melting chamber, the gas leakage rate of the melting chamber and the vacuum degree of the ingot pulling chamber;

[0104] Step 4.2: After the electron beam cooling bed furnace is checked to be normal, start the electron beam cooling bed power supply, and start the 1# to 7# electron guns in sequence, and then the feed chute starts pushing the material for melting.

[0105] Wherein, in step 4.1, the vacuum degree of the smelting chamber is ≤1Pa, the air leakage rate of the smelting chamber is ≤0.3Pa / min, and the vacuum degree of the ingot pulling chamber is ≤1Pa.

[0106] In step 4.2, the current of the 1# to 5# electron guns is 7.0A to 10.0A, and the current of the 6# and 7# electron guns is 2.5A to 6.5A.

[0107] Furthermore, in step 4.2, during the smelting process, the vacuum degree of the smelting chamber is set to ≤10Pa, the smelting voltage is 30KV, the smelting current is 7.0A-10.0A, and the smelting speed is 440kg / h.

[0108] Furthermore, during smelting, when the unmelted raw materials account for 1 / 5 of the total raw material mass, the 6# and 7# electron guns are fed, and the feeding current is 2.5A to 6.5A.

[0109] Furthermore, after cooling is completed, the ingot is cooled for 9.5 hours to obtain a large-sized titanium alloy ingot containing copper elements with uniform composition, the size of which is 2200mm*1200mm*100mm.

[0110] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0111] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for preparing a large-sized titanium alloy ingot containing copper, characterized in that: The following steps are involved: Step 1, preparing raw materials: according to the composition of the target titanium alloy ingot, the raw materials include titanium parts, sponge titanium, and copper parts, wherein the content of titanium is 90.4% to 91.8% and the content of copper is 7.8% to 9% by weight; Step 2, pressing electrode blocks: loading the titanium sponge prepared in step 1 into a mold, and pressing the titanium sponge on a hydraulic press to obtain a plurality of electrode blocks; Step 3, laying out: Laying out the titanium parts, copper parts and the electrode blocks obtained in step 2 on the electron beam cooling furnace according to the set method; Step 4, electron beam cooling furnace smelting: the titanium parts, copper parts and electrode blocks prepared in step 3 are sent into the smelting chamber of the electron beam cooling furnace, and smelted according to the set smelting parameters. After the smelting is completed, the parts are cooled to obtain the target titanium alloy ingot.

2. The method for preparing a large-sized titanium alloy ingot containing copper element according to claim 1, characterized in that: In step 1, the titanium part is a pure titanium plate; the sponge titanium includes 0A grade low-iron and low-oxygen sponge titanium from the same batch or different batches; and the copper part is a copper plate.

3. The method for preparing a large-sized titanium alloy ingot containing copper element according to claim 1, characterized in that: The specific process of step 3 is as follows: Step 3.1, placing a pure titanium plate on the cooling bed of the electron beam cooling bed furnace to prevent the copper plate from sticking to the cooling bed during the smelting process; Step 3.2, a copper plate is arranged on the upper surface of the pure titanium plate, and then at least one electrode block is selected and placed on the copper plate so that the electrode block completely covers the copper plate; Among them, the weight of one layer of copper plate accounts for 8.07% to 10.17% of the total copper plate weight; Step 3.3, arranging the electrode block layer-copper plate layer-electrode block layer in an alternating manner in the feed trough; The electrode block layer is composed of a plurality of electrode blocks; the copper plate layer is composed of copper plates, and the weight of the copper plates accounts for 89.83% to 91.93% of the total weight of the copper plates.

4. The method for preparing a large-sized titanium alloy ingot containing copper according to claim 1, characterized in that: The step 4 comprises the following steps: Step 4.1, check the electron beam cooling furnace, including the vacuum degree of the melting chamber, the gas leakage rate of the melting chamber and the vacuum degree of the ingot pulling chamber; Step 4.2: After the electron beam cooling bed furnace is checked to be normal, start the electron beam cooling bed power supply, and start the 1# to 7# electron guns in sequence, and then the feed chute starts pushing the material for melting.

5. The method for preparing a large-sized titanium alloy ingot containing copper element according to claim 4, characterized in that: In step 4.1, the vacuum degree of the smelting chamber is ≤1Pa, the air leakage rate of the smelting chamber is ≤0.3Pa / min, and the vacuum degree of the ingot pulling chamber is ≤1Pa.

6. The method for preparing a large-sized titanium alloy ingot containing copper element according to claim 4, characterized in that: In step 4.2, the current of the 1# to 5# electron guns is 4.0A to 10.0A, and the current of the 6# and 7# electron guns is 2.5A to 8.0A.

7. The method for preparing a large-sized titanium alloy ingot containing copper according to claim 4, characterized in that: In step 4.2, during the smelting process, the vacuum degree of the smelting chamber is set to ≤10Pa, the smelting voltage is 29.5KV~30KV, the smelting current is 4.0A~10.0A, and the smelting speed is 380kg / h~440kg / h.

8. The method for preparing a large-sized titanium alloy ingot containing copper according to claim 7, characterized in that: During smelting, when the unmelted raw materials account for 1 / 6 to 1 / 5 of the total raw material mass, the 6# and 7# electron guns are fed with a feeding current of 2.5A to 8.0A.

9. The method for preparing a large-sized titanium alloy ingot containing copper element according to claim 1, characterized in that: In step 4, the cooling time is ≥ 8h.

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