Preparation method of high-uniformity titanium alloy consumable electrode

Abstract

The invention provides a preparation method of a high-uniformity titanium alloy consumable electrode, which comprises the following steps: taking sponge titanium, high-purity metal, intermediate alloy and residual titanium scraps as raw materials, and weighing the raw materials with required weight according to alloy components; the raw materials are sequentially laid on an electrode pressing mold layer by layer according to the particle size from large to small, one-time pressing is carried out after one-time laying and distribution of all the raw materials are completed, and the steps are repeated till an electrode block is formed after multiple times of pressing; and the multiple electrode blocks are subjected to vacuum plasma assembly welding treatment in a vacuum welding box, and the complete consumable electrode is obtained. The raw materials are uniformly laid and distributed layer by layer and then are directly pressed, each electrode block is formed by multiple times of pressing, the pressing direction of the electrode is perpendicular to the melting direction of the electrode in the vacuum consumable melting process, various raw materials on the cross section of the electrode are uniformly distributed during melting, and the raw materials in a molten pool are uniformly distributed in the melting process; and the components of the cast ingot are uniform and stable.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium alloy processing, and in particular relates to a method for preparing a high-uniform titanium alloy consumable electrode. Background Art

[0002] The current preparation method of titanium alloy consumable electrodes is: after mixing various raw materials evenly, pressing small electrode blocks in sections, and then welding them into integral consumable electrodes through vacuum plasma (pressing them into pieces of full circle, semicircle or other shaped electrode blocks, and finally welding them into a whole electrode).

[0003] Mixing materials: First, raw materials of different types and particle sizes are weighed according to a certain weight ratio through a weighing device, and then transported to a mixer. The mixing system mixes the various raw materials evenly by rotating the internal blades or the mixer tank.

[0004] Electrode pressing and welding: Use a hydraulic press to press the evenly mixed raw materials into electrode blocks in full circle, semicircle or other shapes, press them axially, stack them neatly, and then weld multiple electrode blocks in a vacuum plasma welding box to form an integral consumable electrode.

[0005] The invention with application number 202210683931 discloses a preparation method for improving the uniformity of the mixing of titanium alloy integral consumable electrodes. By rotating the built-in rotating blades in the mixer and the rotating tank body of the mixer, the raw materials are continuously mixed during the process of conveying and pouring into the mold barrel, thereby improving the uniformity of the distribution of raw materials in the titanium alloy pressed electrode.

[0006] The invention with application number 2024102126900 discloses a method for preparing a multi-component titanium alloy ingot, which improves the uniformity of alloy distribution inside the electrode by adopting a multi-component titanium alloy of four or more elements and wrapping the premix with sponge titanium.

[0007] The above-mentioned prior art has a certain effect on improving the uniformity of alloy distribution in titanium alloy consumable electrodes. However, due to the different particle sizes and densities of various raw materials, and the small weight of some alloys, there is a problem of uneven local mixing when mechanically mixing by a mixer. The alloy materials with a small weight, small particle size and high density cannot be mixed evenly during the mixing process, and after being poured into the mold, they easily fall to the bottom of the mold through the gaps between the large particles of raw materials, resulting in uneven distribution of the alloy materials in the electrode block. Figure 3 shown. Summary of the invention

[0008] The purpose of the present invention is to provide a method for preparing a highly uniform titanium alloy consumable electrode. The present invention does not use a mixer for mechanical mixing, but directly presses the raw materials after evenly laying the fabric layer by layer, and each electrode block is formed by multiple pressings, that is, the cross section of each electrode block is composed of multiple pressing units, and each pressing unit is pressed after each raw material is evenly laid. The pressing direction of the electrode is perpendicular to the melting direction of the electrode during vacuum consumable smelting (pressing in the radial direction and melting in the axial direction). During melting, various raw materials are evenly distributed on the cross section of the electrode, and the raw materials are evenly distributed in the molten pool during the smelting process, which helps to make the composition of the ingot uniform and stable. The preparation method of the present invention can solve the problems of uneven composition and segregation of the ingot caused by the poor uniformity of the mixing of the existing titanium alloy integral consumable electrode.

[0009] In order to achieve the above technical objectives, the technical solution adopted by the embodiment of the present invention is:

[0010] A method for preparing a high-uniform titanium alloy consumable electrode comprises the following steps:

[0011] Step S1, raw material preparation: using sponge titanium, high-purity metal, master alloy and residual titanium chips as raw materials, weighing the required weight of raw materials according to the alloy composition;

[0012] Step S2, pressing the electrode block: laying the raw materials layer by layer in descending order of particle size on the electrode pressing mold, and after all the raw materials have been laid once, pressing is performed once, and the above steps are repeated until an electrode block is formed after multiple pressings;

[0013] Step S3, electrode welding: a plurality of electrode blocks obtained in step S2 are subjected to vacuum plasma welding in a vacuum welding box to obtain a complete consumable electrode.

[0014] Furthermore, the electrode block in step S2 is formed by multiple radial pressing operations, and is melted in the axial direction during the subsequent smelting process, so that various raw materials are evenly distributed on the same cross section of the electrode during melting.

[0015] Furthermore, the cross-sectional shape of the inner cavity of the electrode pressing mold in step S2 is a shape such as a rectangle, a semi-regular octagon and a semicircle, which is convenient for fabric pressing of the electrode block.

[0016] Furthermore, in step S2, a layer of titanium sponge is first laid on the bottom of the mold, and then the remaining raw materials, high-purity metals, intermediate alloys and residual titanium chips are uniformly laid layer by layer on the titanium sponge in descending order of particle size.

[0017] The technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0018] The present invention relates to a preparation method for improving the uniformity of the mixed material distribution of titanium alloy consumable electrodes. The raw materials are directly laid layer by layer in the order of particle size from large to small in an electrode pressing mold to achieve uniform distribution, and then the electrode block is radially pressed multiple times using a hydraulic press. Compared with the existing electrode preparation method of mechanical mixing and axial pressing by a mixer, the raw materials of the electrode prepared according to the present invention are more evenly distributed in the same cross section and axial direction of the electrode, which is very helpful to improve the composition uniformity of the titanium alloy smelting ingot. The preparation process of the present invention is safe and reliable, and is conducive to large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 Schematic diagram of the cross-sectional structure of the electrode block in an embodiment of the present invention.

[0021] Figure 2a Schematic diagram of the cross section of a complete consumable electrode in an embodiment of the present invention.

[0022] Figure 2b Schematic diagram of the longitudinal section of a complete consumable electrode in an embodiment of the present invention.

[0023] Figure 3 It is a partially enlarged schematic diagram of an electrode block prepared by the prior art solution.

[0024] Explanation of the accompanying symbols: 1-schematic line of the pressing unit boundary; 2-partial enlarged view of the electrode block (schematic diagram of the raw material distribution); 3-sponge titanium; 4-large-grained intermediate alloys such as aluminum beans; 5-small-grained intermediate alloys in the form of chips; 6-powdered intermediate alloys such as Al-Mo; 7-pressing direction of the electrode block; 8-electrode block; 9-electrode pressing mold; 10, 11, 12-welds; 13, 14-schematic lines of the pressing unit boundary. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] Example 1

[0027] A method for preparing a high-uniform TC4 titanium alloy consumable electrode comprises the following steps:

[0028] Step S1, raw material preparation: according to the target product TC4 titanium alloy (alloy composition Ti-6.4Al-4.2V-0.2Fe), grade 0 titanium sponge, aluminum beans (Al99.70), AlV65, and AlFe60 are selected as raw materials, the particle size of grade 0 titanium sponge is 3-25.4 mm, the particle size of aluminum beans is 5-13 mm, the particle size of AlV65 is 1-5 mm, and the particle size of AlFe60 is 1-5 mm;

[0029] Step S2, laying material and pressing electrode blocks: the corresponding raw materials are automatically weighed by an automatic weighing device according to the composition ratio of TC4 titanium alloy, and the raw materials are laid layer by layer on a semi-regular octagonal electrode pressing mold. The order of laying the raw materials is: grade 0 titanium sponge, aluminum beans, AlV65, AlFe60. After all the raw materials have been laid once, radial pressing is performed once. The above steps are repeated until 20 times to form a semi-regular octagonal electrode block with a side length of 274 mm, a thickness of 420 mm, and a weight of 270 kg. Figure 1 shown.

[0030] The total weight of raw materials for each feeding is 13.5kg, and the weight of raw materials used for each feeding is automatically controlled and weighed according to the TC4 alloy ratio. The feeding of raw materials is controlled by a computer according to the set process to avoid the influence of human and environmental factors on the raw material composition and alloy uniformity, and ensure the quality of the electrode;

[0031] Step S3, electrode welding: stack the 16 electrode blocks obtained in step S2 neatly and then weld them in a vacuum plasma welding box to obtain a complete consumable electrode, such as Figure 2a and Figure 2b shown.

[0032] Step S4, vacuum melting: After the TC4 titanium alloy consumable electrode is subjected to three times of VAR melting in a vacuum consumable melting furnace, samples are taken from the upper, middle and lower parts of the ingot to detect the chemical composition. The results are shown in Table 1.

[0033] Table 1 Main component contents of TC4 titanium alloy ingot

[0034]

[0035] It can be seen from Table 1 that the TC4 titanium alloy ingot prepared in this embodiment has good longitudinal composition uniformity, which means that the electrode prepared by the preparation method of the present invention has a very uniform distribution of ingot composition produced by smelting, and can solve the problems of uneven ingot composition and segregation caused by poor uniformity of the mixing material of the existing titanium alloy consumable electrode.

[0036] Example 2

[0037] A method for preparing a highly uniform TA19 titanium alloy consumable electrode comprises the following steps:

[0038] Step S1, raw material preparation: according to the target product TA19 titanium alloy (alloy composition Ti-6.1Al-2.0Sn-4.1Zr-2.0Mo-0.08Si-0.105oxygen), select grade 0 sponge titanium, Al-60Mo, Al-37Sn, Al-11Si, HZr-1 sponge zirconium, aluminum beans (Al99.80) and YTiO2-2 as raw materials, the particle size of grade 0 sponge titanium is 3-25.4mm, the particle size of HZr-1 sponge zirconium is 3-25mm, the particle size of aluminum beans is 5-13mm, Al-37Sn and Al-11Si are in chips with a particle size of (0.08-1.0)mm×(3-15)mm×(3-15)mm, YTiO2-2 is powder with a particle size ≤0.09mm, and Al-60Mo is powder with a particle size ≤0.08mm.

[0039] Step S2, laying and pressing the electrode block: the corresponding raw materials are automatically weighed by an automatic weighing device according to the composition ratio of TA19 titanium alloy, and the raw materials are laid layer by layer on the rectangular electrode pressing mold. The order of laying the raw materials is: grade 0 titanium sponge, HZr-1 zirconium sponge, aluminum beans, Al-37Sn, Al-11Si, YTiO2-2 and Al-60Mo. After all the raw materials have been laid once, radial pressing is performed once. Repeat the above steps until 14 times to form a rectangular electrode block with a side length of 500mm, a thickness of 420mm and a weight of 364kg. Figure 1 shown.

[0040] The total weight of raw materials for each laying is 26kg, and the weight of raw materials used for each laying is automatically controlled and weighed according to the TA19 titanium alloy ratio. The raw material laying is controlled by a computer according to the set process to avoid the influence of human and environmental factors on the raw material composition and alloy uniformity, and ensure the quality of the electrode;

[0041] Step S3, electrode welding: stack the 16 electrode blocks obtained in step S2 neatly and then weld them in a vacuum plasma welding box to obtain a complete consumable electrode, such as Figure 2a and Figure 2b shown.

[0042] Step S4, vacuum melting: After the TA19 titanium alloy consumable electrode is subjected to three times of VAR melting in a vacuum consumable melting furnace, samples are taken from the upper, middle and lower parts of the ingot to detect the chemical composition. The results are shown in Table 1.

[0043] Table 2 Main component contents of TA19 titanium alloy ingot

[0044]

[0045] It can be seen from Table 1 that the TA19 titanium alloy ingot prepared in this embodiment has good longitudinal composition uniformity, which means that the electrode prepared by the preparation method of the present invention has a very uniform distribution of ingot composition produced by smelting, and can solve the problems of uneven ingot composition and segregation caused by poor uniformity of the mixing material of the existing titanium alloy consumable electrode.

[0046] Example 3

[0047] A method for preparing a highly uniform TC18 titanium alloy consumable electrode comprises the following steps:

[0048] Step S1, raw material preparation: according to the target product TC18 titanium alloy (alloy composition Ti-5.1Al-5.0Mo-5.0V-1Cr-1Fe-0.13O), select 0-grade sponge titanium, Mo40V40Al20, AlCr60, FeAl60, aluminum beans (Al99.85) and YTiO2-2 as raw materials, the particle size of 0-grade sponge titanium is 3-25.4mm, the particle size of Mo40V40Al20 is 1-3mm, the particle size of AlCr60 is 1-5mm, the particle size of AlFe60 is 1-5mm, the particle size of aluminum beans is 5-13mm, and YTiO2-2 is powder with a particle size of ≤0.09mm;

[0049] Step S2, laying and pressing the electrode block: the corresponding raw materials are automatically weighed by the automatic weighing device according to the ratio of TC18 titanium alloy, and the raw materials are laid layer by layer on the semi-regular octagonal electrode pressing mold. The order of laying the raw materials is: grade 0 sponge titanium, aluminum beans, AlCr60, AlFe60 and YTiO2-2. After all the raw materials have been laid once, radial pressing is performed once. Repeat the above steps until 18 times to form a semicircular electrode block with a diameter of 600mm, a thickness of 410mm and a weight of 200kg. Figure 1 shown.

[0050] The total weight of raw materials for each laying is 12kg, and the weight of raw materials used for each laying is automatically controlled and weighed according to the TC18 titanium alloy ratio. The raw material laying is controlled by a computer according to the set process to avoid the influence of human and environmental factors on the raw material composition and alloy uniformity, and ensure the quality of the electrode;

[0051] Step S3, electrode welding: stack the 16 electrode blocks obtained in step S2 neatly and then weld them in a vacuum plasma welding box to obtain a complete consumable electrode, such as Figure 2a and Figure 2b shown.

[0052] Step S4, vacuum melting: After the TA19 consumable electrode is subjected to three times of VAR melting in a vacuum consumable melting furnace, samples are taken from the upper, middle and lower parts of the ingot to detect the chemical composition. The results are shown in Table 3.

[0053] Table 3 Main component contents of TC18 titanium alloy ingot

[0054]

[0055] It can be seen from Table 3 that the TC18 titanium alloy ingot prepared in this embodiment has good longitudinal composition uniformity, which means that the electrode prepared by the preparation method of the present invention has a very uniform distribution of ingot composition produced by smelting, and can solve the problem of uneven ingot composition and segregation caused by poor uniformity of the mixing material of the existing titanium alloy consumable electrode.

[0056] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for preparing a high-uniform titanium alloy consumable electrode, characterized in that: The following steps are involved: Step S1, raw material preparation: using sponge titanium, high-purity metal, master alloy and residual titanium chips as raw materials, weighing the required weight of raw materials according to the alloy composition; Step S2, pressing the electrode block with cloth: laying the raw materials layer by layer in descending order of particle size on the electrode pressing mold, and after all the raw materials have been laid once, pressing is performed once, and the above steps are repeated until an electrode block is formed after multiple pressings; Step S3, electrode welding: a plurality of electrode blocks obtained in step S2 are subjected to vacuum plasma welding in a vacuum welding box to obtain a complete consumable electrode.

2. The method for preparing a high-uniform titanium alloy consumable electrode according to claim 1, characterized in that: In step S2, the electrode block is formed by multiple radial pressing operations.

3. The method for preparing a high-uniform titanium alloy consumable electrode according to claim 1, characterized in that: The cross-sectional shape of the inner cavity of the electrode pressing mold in step S2 is a shape such as a rectangle, a semi-regular octagon and a semicircle, which is convenient for fabric pressing of the electrode block.

4. The method for preparing a high-uniform titanium alloy consumable electrode according to claim 1, characterized in that: In step S2, a layer of titanium sponge is first laid on the bottom of the mold, and then the remaining raw materials, high-purity metal, intermediate alloy and residual titanium chips are evenly laid on the titanium sponge layer by layer in order from large to small particle sizes.

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