Tantalum-tungsten alloy tube sheathing extrusion process

Abstract

The invention discloses a tantalum-tungsten alloy tube sheathing extrusion process, comprising the following steps: selecting an alloy sleeve layer with a suitable inner diameter according to the specifications of the tantalum-tungsten alloy tube to be produced, providing a thermal insulation layer on the outer side of the alloy sleeve layer, and providing a glass lubricant on the inner side of the alloy sleeve layer to form a cylindrical glass lubricating pad to form a sheath for extruding the tantalum-tungsten alloy tube; feeding a tantalum-tungsten alloy tube blank into the sheath for high-temperature extrusion, temporarily storing and accommodating excess glass lubricant due to expansion and extrusion during the extrusion process through a structure provided in the sheath, providing external support and thermal insulation for the glass pad lubricating layer through the alloy sleeve layer, further improving the thermal insulation effect through the thermal insulation layer, reducing heat loss after the blank enters the sheath, and simultaneously quickly heating the alloy sleeve layer and the tantalum-tungsten alloy tube blank through electromagnetic induction heating, saving heating energy, being beneficial to energy conservation and environmental protection, and improving work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of tantalum-tungsten alloy pipes, and in particular to a tantalum-tungsten alloy pipe sheathing extrusion process. Background Art

[0002] Tantalum-tungsten (TaW) alloy is also an alloy material composed of two transition metal elements. It possesses exceptional physical and chemical properties and is widely used in aerospace, aviation, navigation, military, defense, and medical fields. Tantalum-tungsten alloy combines the advantages of tantalum and tungsten, primarily exhibiting high melting temperature, high density, high hardness, excellent flexural strength, wear resistance, high temperature resistance, and corrosion resistance. However, the alloy's properties vary with the tungsten content. Research has shown that, within a certain range, increasing tungsten content increases the strength factor (η) and the number of covalent electrons, and the alloy's strength and hardness increase accordingly. Maximum strength and hardness are achieved at approximately 50 wt.% tungsten. With the addition of tungsten, the alloy's density and plasticity decrease, and a tungsten stripe structure appears.

[0003] Tantalum-tungsten alloys are mainly used to manufacture EFP liners, heaters, cooling coils, heat exchangers, and reactors. Among them, TaW alloy liners can form spherical projectiles with good shape, stable flight, and reduced velocity, and have high penetration performance and mechanical properties.

[0004] Tantalum-tungsten alloy tubes are typically formed through hot extrusion, which requires the use of a sheath. Most existing sheaths for tantalum-tungsten alloy tube extrusion have a simple structure and only use a glass lubricating pad for sheathing and extrusion. This has poor thermal insulation performance, and the temperature of the billet drops after entering the sheath, requiring a large amount of energy to continue heating to the extrusion temperature, which is not conducive to energy conservation and environmental protection. At the same time, the glass lubricant expands in volume after being heated, and as the billet enters, it continues to squeeze the glass lubricant. The excess glass lubricant is difficult to clean, affecting the overall quality of the tube. To this end, we propose a sheathing extrusion process for tantalum-tungsten alloy tubes. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a tantalum-tungsten alloy tube sheathing extrusion process to reduce the heat loss of the blank after entering the sheath. At the same time, the alloy sleeve layer and the tantalum-tungsten alloy tube blank can be quickly heated by electromagnetic induction heating, saving heating energy, being beneficial to energy conservation and environmental protection, improving work efficiency, and effectively solving the problems in the background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a tantalum-tungsten alloy tube sheathing extrusion process, comprising the following steps:

[0007] S1: Select an alloy sleeve layer with a suitable inner diameter according to the specifications of the tantalum-tungsten alloy tube to be produced, coat the outer side of the alloy sleeve layer with a thermal insulation layer, and place a glass lubricant on the inner side of the alloy sleeve layer to form a cylindrical glass lubrication pad to form a sheath for extrusion of the tantalum-tungsten alloy tube;

[0008] S2: feeding the tantalum-tungsten alloy tube billet into the sheath prepared in step S1 for high-temperature extrusion at a temperature of 1100-1300°C and a discharge speed of 0.2-1 m / min. During the extrusion process, the excess glass lubricant due to expansion and extrusion is temporarily stored and accommodated by a structure provided in the sheath;

[0009] S3: After extrusion, the tantalum-tungsten alloy tube is cooled and the residual glass lubricant on the surface is cleaned. Then, both ends are cut off and the inner and outer surfaces of the tantalum-tungsten alloy tube are polished according to product requirements.

[0010] S4: Clean the glass lubricant remaining in the bag.

[0011] As a preferred technical solution of the present invention, the alloy sleeve layer is a nickel-based high-temperature alloy layer, the thermal insulation layer is a cylindrical short-filament high-aluminum aluminum silicate fiber layer coated on the outer surface of the nickel-based high-temperature alloy layer, and the glass lubrication pad is a cylindrical glass pad lubrication layer arranged on the inner surface of the nickel-based high-temperature alloy layer.

[0012] As a preferred technical solution of the present invention, the structure for temporarily storing and accommodating the excess glass lubricant due to expansion and extrusion in step S2 is a plurality of groups of grooves evenly opened on the upper inner surface of the nickel-based high-temperature alloy layer, and a movable plate is slidably arranged in the grooves.

[0013] As a preferred technical solution of the present invention, a spring is provided between the lower portion of the inner surface of the groove and the upper surface of the movable plate.

[0014] As a preferred technical solution of the present invention, a telescopic rod is provided between the lower portion of the inner surface of the groove and the upper surface of the movable plate.

[0015] As a preferred technical solution of the present invention, the lower surface of the movable plate is an arc shape that matches the nickel-based high-temperature alloy layer. Under the pressure of the spring, when the movable plate is squeezed by the unmelted glass pad lubricating layer, its lower surface is flush with the inner surface of the nickel-based high-temperature alloy layer.

[0016] As a preferred technical solution of the present invention, the lower surface of the movable plate is arc-shaped. Under the pressure of the spring, when the movable plate is squeezed by the unmelted glass pad lubricating layer, its lower surface is slightly higher than the inner surface of the nickel-based high-temperature alloy layer.

[0017] As a preferred technical solution of the present invention, two steps for limiting the lower surface of the movable plate are symmetrically provided at both ends of the inner surface of the bottom of the groove, and the steps include two inclined sections protruding toward the middle.

[0018] As a preferred technical solution of the present invention, inclined sections matching the steps are symmetrically provided at both ends of the lower surface of the movable plate.

[0019] As a preferred technical solution of the present invention, a bump is provided on the lower surface of the movable plate, and the bump is arranged between two steps when the movable plate is squeezed by the unmelted glass pad lubricating layer under the pressure of the spring.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: an alloy sleeve layer and a thermal insulation layer are sequentially arranged on the outer surface of the glass lubricating pad, and the alloy sleeve layer provides external support and thermal insulation for the glass pad lubricating layer; the thermal insulation layer can further improve the thermal insulation effect, reduce the heat loss of the blank after entering the sheath, and at the same time, the alloy sleeve layer and the tantalum-tungsten alloy pipe blank can be quickly heated by electromagnetic induction heating, saving heating energy, being beneficial to energy conservation and environmental protection, and improving work efficiency; in step S2, the excess glass lubricant due to expansion and extrusion is temporarily stored and accommodated by the structure arranged in the sheath, thereby avoiding being squeezed out to the outside during the extrusion process and affecting the extrusion molding of the tantalum-tungsten alloy pipe, thereby ensuring the overall quality of the tantalum-tungsten alloy pipe; and in step S4, the residual glass lubricant in the sheath is cleaned to avoid affecting the next extrusion use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a process flow chart of the present invention;

[0022] Figure 2 This is a schematic structural diagram of the package of the present invention;

[0023] Figure 3 Schematic diagram of the side cross-sectional structure of the package of the present invention;

[0024] Figure 4 A partial cross-sectional top view of the package of the present invention;

[0025] Figure 5 A schematic side partial cross-sectional view of another embodiment of the package of the present invention;

[0026] Figure 6 A schematic side view of a partial cross-sectional structure of another embodiment of the package of the present invention;

[0027] Figure 7 For the present invention Figure 6 A magnified view of the structure at point A.

[0028] In the figure: 1 nickel-based high-temperature alloy layer, 2 short-filament high-aluminum aluminum silicate fiber layer, 3 glass pad lubrication layer, 4 groove, 5 movable plate, 6 spring, 7 spiral groove, 8 step, 9 bump, 10 inclined section, 11 telescopic rod. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See also Figure 1-7 The present invention provides a technical solution: a tantalum-tungsten alloy tube sheathing extrusion process, comprising the following steps:

[0031] S1: Select an alloy sleeve layer with a suitable inner diameter according to the specifications of the tantalum-tungsten alloy tube to be produced, coat the outer side of the alloy sleeve layer with a thermal insulation layer, and place a glass lubricant on the inner side of the alloy sleeve layer to form a cylindrical glass lubrication pad to form a sheath for extrusion of the tantalum-tungsten alloy tube;

[0032] The alloy sleeve layer is a nickel-based high-temperature alloy layer 1, the thermal insulation layer is a cylindrical short-filament high-aluminum aluminum silicate fiber layer 2 coated on the outer surface of the nickel-based high-temperature alloy layer 1, and the glass lubricating pad is a cylindrical glass pad lubricating layer 3 provided on the inner surface of the nickel-based high-temperature alloy layer 1. A nickel-based high-temperature alloy layer and a short-filament high-aluminum aluminum silicate fiber layer are sequentially provided on the outer surface of the glass pad lubricating layer. Both the nickel-based high-temperature alloy layer and the short-filament high-aluminum aluminum silicate fiber layer can withstand the high temperature during extrusion of the tantalum-tungsten alloy pipe. The nickel-based high-temperature alloy layer provides external support and thermal insulation for the glass pad lubricating layer. At the same time, the short-filament high-aluminum aluminum silicate fiber layer can further improve the thermal insulation effect and reduce the heat loss of the blank after entering the sheath. At the same time, the nickel-based high-temperature alloy layer and the tantalum-tungsten alloy pipe blank can be quickly heated by electromagnetic induction heating, saving heating energy, being beneficial to energy saving and environmental protection, and improving work efficiency.

[0033] S2: The tantalum-tungsten alloy tube billet is fed into the sheath prepared in step S1 and subjected to high-temperature extrusion. The extrusion temperature is 1100-1300°C and the extrusion discharge speed is 0.2-1 m / min. During the extrusion process, the excess glass lubricant due to expansion and extrusion is temporarily stored and accommodated by a structure provided in the sheath, thereby preventing the glass lubricant from being squeezed out during the extrusion process and affecting the extrusion molding of the tantalum-tungsten alloy tube, thereby ensuring the overall quality of the tantalum-tungsten alloy tube.

[0034] S3: After extrusion, the tantalum-tungsten alloy tube is cooled and the residual glass lubricant on the surface is cleaned. Then, both ends are cut off and the inner and outer surfaces of the tantalum-tungsten alloy tube are polished according to product requirements.

[0035] S4: Clean the residual glass lubricant in the sheath to facilitate the next sheath extrusion of tantalum-tungsten alloy pipes.

[0036] In one of the specific technical solutions, the structure for temporarily storing and accommodating the excess glass lubricant due to expansion and extrusion in step S2 is a plurality of groups of grooves 4 evenly opened on the upper inner surface of the nickel-based high-temperature alloy layer 1, so as to prevent the glass lubricant from being squeezed outward during the extrusion process and affecting the extrusion molding of the tantalum-tungsten alloy tube, thereby ensuring the overall quality of the tantalum-tungsten alloy tube.

[0037] Preferably, a movable plate 5 is slidably provided in the groove 4 for automatically pushing out the excess glass lubricant contained in the groove 4 after the extrusion is completed, so as to facilitate cleaning after the extrusion and further improve the working efficiency.

[0038] For more details, please refer to the preferred technical solution. Figure 5 A spring 6 is provided between the lower portion of the inner surface of the groove 4 and the upper surface of the movable plate 5. The spring 6 is preferably a high-temperature resistant spring 6, such as an X718 compression spring resistant to 700-800°C or a Nimonic90 spring resistant to 900°C. When the glass pad lubricating layer 3 is heated and squeezed to have excess margin, it squeezes the movable plate 5 and enters the groove 4. At this time, the spring 6 is compressed; after the squeezing is completed, the spring 6 pushes the movable plate 5 outward, thereby pushing out the glass lubricant contained in the groove 4, completing the cleaning of the glass lubricant.

[0039] According to a preferred technical solution, the lower surface of the movable plate 5 is an arc that matches the nickel-based high-temperature alloy layer 1. Under the pressure of the spring 6, when the movable plate 5 is squeezed by the unmelted glass pad lubricating layer 3, its lower surface is flush with the inner surface of the nickel-based high-temperature alloy layer 1, which facilitates the formation of the glass pad lubricating layer 3.

[0040] Optionally, the shape of the groove 4 is roughly an isosceles trapezoid with the upper base length shorter than the lower base length, so that the glass that expands and enters the groove 4 during the heating and extrusion process can be pushed out by the movable plate 5 after the extrusion is completed, which is convenient for cleaning.

[0041] The present invention also provides another embodiment, please refer to Figure 5 and Figure 6The lower surface of the movable plate 5 is arc-shaped. Under the pressure of the spring 6, when the movable plate 5 is squeezed by the unmelted glass pad lubricating layer 3, its lower surface is slightly higher than the inner surface of the nickel-based high-temperature alloy layer 1, thereby forming a shallow depression. When the inner surface of the nickel-based high-temperature alloy layer 1 is relatively smooth, the glass pad lubricating layer 3 is not easy to adhere and fix. Through the depression, the glass pad lubricating layer 3 can form a small block corresponding to the depression, making it easy to adhere and more firmly fixed.

[0042] According to a preferred technical solution, two steps 8 for limiting the lower surface of the movable plate 5 are symmetrically provided at both ends of the bottom inner surface of the groove 4, so that there is a certain distance between the lower surface of the movable plate 5 and the inner surface of the nickel-based high-temperature alloy layer 1, forming a depression that facilitates the adhesion of the glass pad lubricating layer 3.

[0043] Further preferably, the step 8 includes two inclined sections protruding toward the middle, and the step is configured to be formed by connecting two inclined surfaces, so that the glass lubricant or glass debris can be more easily cleaned and pushed out of the groove 4 after the extrusion is completed.

[0044] According to a preferred technical solution, inclined sections 10 matching the steps 8 are symmetrically provided at both ends of the lower surface of the movable plate 5. Under the pressure of the spring 6, the inclined sections 10 of the movable plate 5 come into contact with the steps 8, thereby preventing glass lubricant from entering the groove 4 when the glass pad lubricating layer 3 is set.

[0045] Further preferably, a protrusion 9 is provided on the lower surface of the movable plate 5. When the movable plate 5 is squeezed by the unmelted glass pad lubricating layer 3 under the pressure of the spring 6, the protrusion 9 is set between the two steps 8, that is, the protrusion 9 protrudes out of a part of the inclined section at the lower part of the two steps 8, which is used to prevent the glass lubricant from entering between the inclined section of the step 8 and the inclined section 10 of the movable plate 5 when the glass pad lubricating layer 3 is set.

[0046] Optionally, the gap between the movable plate 5 and the inner surface of the groove 4 is less than 0.5 mm to prevent the glass lubricant from penetrating into the groove 4 when the glass pad lubricating layer 3 is provided.

[0047] The gap includes the gap between the step 8 and the protrusion 9 and the inclined section 10.

[0048] The present invention also provides another embodiment, please refer to Figure 6 , which is substantially the same as the above embodiment, except that: a telescopic rod 11 is provided between the lower portion of the inner surface of the groove 4 and the upper surface of the movable plate 5, and the telescopic rod 11 specifically includes a fixed tube, a return spring and a movable rod. The movable rod is connected to the inner surface of the fixed tube through the return spring, and the movable rod is slidably arranged in the fixed tube. The telescopic rod 11 replaces the spring 6 to automatically push out the movable plate 5, thereby preventing the glass lubricant from entering the groove 4 and adhering to the spring 6, thereby affecting its telescopic reset.

[0049] Optional technical solutions, please refer to Figure 2 and Figure 4 The inner surface of the nickel-based high-temperature alloy layer 1 is provided with a spiral groove 7. When the glass pad lubricating layer 3 is formed, in addition to the cylindrical glass pad lubricating layer 3 on the inner surface of the nickel-based high-temperature alloy layer 1, a portion of the glass lubricant will enter the spiral groove 7 and be integrated with the glass pad lubricating layer 3, making the connection between the glass pad lubricating layer 3 and the nickel-based high-temperature alloy layer 1 more firmly, ensuring the stability of the extrusion process, and improving the overall quality of the tantalum-tungsten alloy tube.

[0050] Further optionally, the cross-sectional shape of the spiral groove 7 is a dovetail groove, i.e., an isosceles trapezoid, and its side located at the inner wall of the nickel-based high-temperature alloy layer 1 is shorter than the side located inside the nickel-based high-temperature alloy layer 1, so that the glass pad lubricating layer 3 is not easy to fall off.

[0051] Furthermore, the position of the spiral groove 7 does not overlap with the position of the groove 4 , that is, the spiral groove 7 does not conflict with the groove 4 , the movable plate 5 , etc., thereby avoiding affecting the accommodation function of the groove 4 .

[0052] Optionally, step S4 includes cleaning the groove 4 and cleaning the spiral groove 7. The cleaning of the groove 4 is carried out by pushing the movable plate 5 outward through the elastic reset of the spring 6 or the telescopic rod 11, and cleaning out the glass lubricant remaining in the groove 4; the cleaning of the spiral groove 7 is carried out by using a large screw matching the spiral groove 7, screwing it into one end of the nickel-based high-temperature alloy layer 1, and spirally moving forward to slowly push out the glass lubricant remaining in the spiral groove 7, thereby completing the cleaning.

[0053] Any undisclosed portions of the present invention are prior art, and their specific structures, materials, and operating principles will not be described in detail. Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tantalum-tungsten alloy tube sheathing extrusion process, characterized in that: The following steps are involved: S1: Select an alloy sleeve layer with a suitable inner diameter according to the specifications of the tantalum-tungsten alloy tube to be produced, provide a heat preservation and insulation layer on the outside of the alloy sleeve layer, and provide a glass lubricant on the inside of the alloy sleeve layer to form a cylindrical glass lubrication pad to form a sheath for extrusion of the tantalum-tungsten alloy tube; the alloy sleeve layer is a nickel-based high-temperature alloy layer (1), the heat preservation and insulation layer is a cylindrical short-filament high-aluminum aluminum silicate fiber layer (2) provided on the outer surface of the nickel-based high-temperature alloy layer (1), and the glass lubrication pad is a cylindrical glass pad lubrication layer (3) provided on the inner surface of the nickel-based high-temperature alloy layer (1); S2: feeding the tantalum-tungsten alloy tube blank into the sheath produced in step S1 and performing high-temperature extrusion, wherein the extrusion temperature is 1100-1300° C. and the extrusion discharge speed is 0.2-1 m / min. During the extrusion process, the excess glass lubricant due to expansion and extrusion is temporarily stored and accommodated by a structure provided in the sheath. The temporary storage and accommodation structure is a plurality of groups of grooves (4) uniformly provided on the upper inner surface of the nickel-based high-temperature alloy layer (1), and a movable plate (5) is slidably provided in the groove (4); S3: After extrusion, the tantalum-tungsten alloy tube is cooled and the residual glass lubricant on the surface is cleaned. Then, both ends are cut off and the inner and outer surfaces of the tantalum-tungsten alloy tube are polished according to product requirements. S4: Clean the glass lubricant remaining in the bag.

2. The tantalum-tungsten alloy tube sheathing extrusion process according to claim 1, characterized in that: A spring (6) is provided between the lower portion of the inner surface of the groove (4) and the upper surface of the movable plate (5).

3. The tantalum-tungsten alloy tube sheathing extrusion process according to claim 1, characterized in that: A telescopic rod (11) is provided between the lower portion of the inner surface of the groove (4) and the upper surface of the movable plate (5).

4. The tantalum-tungsten alloy tube sheathing extrusion process according to claim 2, characterized in that: The lower surface of the movable plate (5) is in an arc shape that matches the nickel-based high-temperature alloy layer (1). When the movable plate (5) is squeezed by the unmelted glass pad lubricating layer (3) under the pressure of the spring (6), its lower surface is flush with the inner surface of the nickel-based high-temperature alloy layer (1).

5. The tantalum-tungsten alloy tube sheathing extrusion process according to claim 2, characterized in that: The lower surface of the movable plate (5) is arc-shaped, and when the movable plate (5) is squeezed by the unmelted glass pad lubricating layer (3) under the pressure of the spring (6), its lower surface is slightly higher than the inner surface of the nickel-based high-temperature alloy layer (1).

6. The tantalum-tungsten alloy tube sheathing extrusion process according to claim 5, characterized in that: Two steps (8) for limiting the lower surface of the movable plate (5) are symmetrically provided at both ends of the inner surface of the bottom of the groove (4), and the steps (8) include two inclined sections protruding toward the middle.

7. The tantalum-tungsten alloy tube sheathing extrusion process according to claim 6, characterized in that: Inclined sections (10) matching the steps (8) are symmetrically provided at both ends of the lower surface of the movable plate (5).

8. The tantalum-tungsten alloy tube sheathing extrusion process according to claim 7, characterized in that: The lower surface of the movable plate (5) is provided with a protrusion (9), and when the movable plate (5) is squeezed by the unmelted glass pad lubricating layer (3) under the pressure of the spring (6), the protrusion (9) is arranged between the two steps (8).

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