Tungsten rod

Abstract

A tungsten rod is manufactured through an additive manufacturing method, and manufacturing equipment of the tungsten rod comprises a left base, a right base, a lathe bed, a spindle box, a feeding box, a sliding box, a tailstock and an ultrasonic welding head. The lathe bed is installed on the left base and the right base, the spindle box is installed above the left base, the feeding box is installed on the side face of the left base and connected with a lead screw on the side face of the lathe bed, and the feeding box can drive the lead screw to rotate. The tail frame is mounted above the right base; the tungsten rod is installed between the tailstock and the spindle box, and the ultrasonic welding head is installed on the sliding box. Tungsten filaments are evenly laid outside the core rod in the direction parallel to the axial direction, then an ultrasonic welding head is used for conducting spiral welding around the axis of the core rod, and the tungsten filaments and the core rod are welded into a whole. The tungsten rod manufactured in this way can obtain high density, and has the very excellent self-sharpening characteristic during axial high-speed impact.

Description

Technical Field

[0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a tungsten rod. Background Art

[0002] When a high-strength tungsten alloy rod manufactured by sintering hits a steel plate at high speed, due to the high critical adiabatic shear strain rate of the tungsten alloy material, adiabatic shear fracture is not easy to occur during high-speed impact. The head of the tungsten rod will "self-blunt" to form a "mushroom head", which increases the penetration resistance and reduces the penetration depth. Avoiding the formation of large-diameter mushroom heads and improving the self-sharpening of tungsten alloy materials during high-speed impact have been hot research topics in various countries in the past 20 years. The current research focus is on the use of large-block metallic glass materials with higher density, metallic glass-based materials reinforced with continuous tungsten wire bundles, and the use of tungsten wire three-dimensional braids and tungsten powder wet sintering technologies. These studies have achieved certain results, but they are still not satisfactory, especially compared with depleted uranium alloy rods, the self-sharpening performance during impact is still significantly poor. The density of the materials that have been found to generate large pieces of metallic glass is relatively low. The interface bonding strength between the base material and the tungsten wire of the metallic glass-based material reinforced with continuous tungsten wire is low, the consistency and reliability are not high, and the density of the final product is significantly lower than that of the depleted uranium alloy. The performance of the wet sintering of tungsten wire three-dimensional braided body and tungsten powder is greatly affected by the sintering temperature. The tear strength is too low when the sintering temperature is low, and the sintering temperature is high, which will anneal the tungsten wire and even melt the tungsten wire, greatly reducing the strength of the tungsten rod. How to improve the self-sharpening and density of the tungsten rod is an urgent issue to be solved. Summary of the invention

[0003] The object of the present invention is to provide a tungsten rod to solve the above problems.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A tungsten rod is manufactured by an additive method of stacking tungsten wire bundles by ultrasonic welding. The tungsten wires are first laid out in an orderly and tight manner on a high-strength tungsten core rod with a thinner diameter, and then the tungsten wires and the tungsten core rod are welded into one with an ultrasonic welding head. The wires are then laid and welded layer by layer until the diameter meets the design requirements.

[0005] Furthermore, the ultrasonic welding equipment includes a left base, a right base, a bed, a spindle box, a feed box, a slide box, a tailstock and an ultrasonic welding head; the bed is installed on the left and right bases, the spindle box is installed above the left base, the feed box is installed on the side of the left base and connected to the lead screw on the side of the bed, and the feed box can drive the lead screw to rotate; the tailstock is installed above the right base; the core rod is installed between the tailstock and the spindle box, and the ultrasonic welding head is installed on the slide box. The spindle servo motor and the feed servo motor are respectively arranged in the spindle box and the feed box; a main chuck is arranged outside the spindle box, a sub-chuck or a top is arranged on the tailstock, and a tungsten rod is installed between the main chuck and the sub-chuck or the top. A guide rail is arranged on the upper surface of the bed, the slide box is arranged above the guide rail, and the lead screw and the slide box are threadedly connected. A clamping cylinder and an ultrasonic welding head are provided on one side of the slide box relative to the main axis, and the ultrasonic welding head is installed at the telescopic end of the clamping cylinder. A tightening cylinder and a tightening pressure wheel are provided on the other side of the slide box relative to the main axis, and the tightening pressure wheel is installed at the telescopic end of the tightening cylinder.

[0006] Furthermore, the tungsten wires are tungsten wire rows arranged in close parallel to each other by bonding the straightened circular or rectangular cross-section tungsten wires on one side at a certain interval using a plurality of single-sided adhesive tapes.

[0007] Furthermore, the ultrasonic welding head includes an ultrasonic transducer, a horn and a welding head. The front end of the welding head is inlaid with a diamond head. The welding head is fixed to the end of the horn. The welding surface of the diamond head is generally flat, and its center is opposite to the main axis.

[0008] Furthermore, a convex cone edge with a triangular cross section is provided in the middle of the welding surface of the diamond indenter along the circumferential direction of the tungsten rod.

[0009] Furthermore, the ultrasonic welding head comprises at least one rolling welding head, the pressure wheel of the rolling welding head is made of cemented carbide, the pressure welding wheel rim of the pressure wheel is an integral circular ring made of polycrystalline diamond, the outer side of the circular ring is basically a cylindrical surface, the outer end face of the circular ring has a rounded corner, and the outer surface of the circular ring has a convex cone edge with a triangular cross-section along the circumferential direction.

[0010] Furthermore, the core rod is made by ultrasonically welding tungsten wires. A stranding machine is used to intertwine several tungsten wires into a tungsten round stranded wire with a circular cross section. The wires are then tied up in sections of a certain length and cut into core rods. The two ends are clamped with a main chuck and an auxiliary chuck and tensioned appropriately. Then, an ultrasonic welder is used to perform spiral welding to harden the wires into a basic core rod.

[0011] Furthermore, tungsten rods are manufactured using the "twisting + welding" method. The tungsten wires are twisted layer by layer into a round rod at a certain winding angle through multiple coaxially arranged stranding machines. A laser welding head or ultrasonic welding head that can rotate around the round rod is installed next to the outlet of each stranding machine to perform spiral welding on the newly twisted tungsten wires to form a dense and hard tungsten wire rod.

[0012] Furthermore, the tungsten rod adopts the "pultrusion" method to arrange a certain number of tungsten wires that are pre-coated with a lower melting point alloy and processed with weak force grooves at a certain interval in order through a circular wire drawing die, or a tungsten wire rope that is twisted into a circular cross-section by a stranding machine is passed through the wire drawing die, and is clamped with a chuck at the outlet end of the wire drawing die and pulled out of the wire drawing die with strong force by a traction machine. An induction heating device is provided at the entrance of the wire drawing die, which can quickly heat the tungsten wire bundle to a melting point close to the coating metal. An air cooling device is provided at the outlet of the wire drawing die to cool the extruded tungsten wire bundle to form a dense and hard tungsten wire rod.

[0013] Furthermore, a reciprocating wire-laying head parallel to the main axis is provided on the dedicated tungsten rod ultrasonic welding machine, and radial wire-hanging teeth are provided at both ends of the tooling.

[0014] A method for ultrasonic welding additive manufacturing of a tungsten rod comprises the following steps: First, straighten the heat-treated cold-drawn high-strength tungsten wire and cut it according to the designed length, then lay these tungsten wires neatly and tightly in a row, and then use several single-sided tapes to stick the straightened circular or rectangular cross-section tungsten wires into a unidirectional tungsten wire row at a certain interval; Clamp the two ends of the high-strength tungsten mandrel on the main chuck and the auxiliary chuck, then cut the unidirectional tungsten wire row and wrap it tightly on the outside of the mandrel with tape, tear off the back tape of a section of the unidirectional tungsten wire row from one end piece by piece and use another tape to wrap the tungsten wire tightly on the outside of the mandrel again, so that the diamond pressure head of the ultrasonic welding head and the opposite pressing wheel are pressed relatively on the exposed tungsten wire, and the thrust of the opposite welding head pressing cylinder and the pressing wheel pressing cylinder is the same when working; Then start the spindle servo motor, feed servo motor and ultrasonic transducer. The spindle servo motor drives the core rod to rotate through the main chuck and the feed servo motor drives the ultrasonic welding head to move axially, so that the center of the diamond indenter of the ultrasonic welding head makes a spiral motion relative to the core rod. The ultrasonic transducer generates high-frequency expansion and contraction, which is amplified by the resonance of the horn and then applied to the tungsten wire through the diamond indenter. Under the diamond indenter, atoms of the tungsten wire diffuse mutually at the interface with the core rod to form a strong bond. After a layer of tungsten wire is completely welded, the unidirectional tungsten wire row is cut again and the above operation is repeated until the diameter of the welded tungsten rod meets the design requirements.

[0015] Further, the production of high-strength tungsten core rods: use a stranding machine to first intertwine several tungsten wires into a tungsten wire round strand with a circular cross section, tie it up in sections according to the set length and cut it into core rods, clamp its two ends with the main chuck and the auxiliary chuck and tighten them appropriately, then start the ultrasonic welding machine for spiral welding to harden it into a basic core rod; The core rod is twisted into a round rod layer by layer by multiple coaxially arranged stranding machines according to the set winding angle. A laser welding head or ultrasonic welding head that can rotate around the round rod is set next to the outlet of each stranding machine to perform spiral welding on the newly twisted tungsten wires to form a dense and hard tungsten rod. The core rod is made of tungsten wire that is pre-plated with a lower melting point alloy and processed with weak force grooves at set intervals. It is arranged in order and passes through a circular drawing die. One end is clamped with a chuck and is pulled out of the drawing die by a traction machine. An induction heating device is provided at the entrance of the drawing die, which can quickly heat the tungsten wire bundle to a melting point close to the coating metal. An air cooling device is provided at the exit of the drawing die to cool the extruded tungsten wire bundle to form a tungsten rod.

[0016] A tungsten rod is made by the tungsten rod welding method.

[0017] Compared with the prior art, the present invention has the following technical effects: The ultrasonic welding of the present invention will not cause annealing of the tungsten wire, will not reduce the strength of the tungsten wire, and the manufactured tungsten rod will be tougher, and the tensile strength, compressive strength and bending strength will be significantly better than those of sintered tungsten rods and depleted uranium rods. The present invention has a high density, uses only high-density and high-purity tungsten wire as a raw material, and does not use other alloy-based materials with lower density. The prepared tungsten rod has a higher density, which can exceed the density of depleted uranium.

[0018] The present invention controls the walking pitch of the welding head and the shape of the welding head pressure surface, and can preform weak force grooves at a certain interval on each tungsten wire, so that the chip breaking length can be controlled and the best self-sharpening performance can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the welding equipment of the present invention; Figure 2 A top view of the welding equipment of the present invention; Figure 3 This is a schematic diagram of the structure of the ultrasonic welding machine of the present invention; Figure 4 This is a partial structural diagram of the diamond indenter of the present invention; Figure 5 This is a schematic diagram of the adhesive-backed tungsten wire array of the present invention; Figure 6 This is a schematic diagram of the twisted + welded tungsten rods of the present invention; Figure 7 This is a schematic diagram of the pultruded tungsten rod of the present invention; Among them: 1 - left base, 2 - spindle box, 3 - main chuck, 4 - feed box, 5 - lead screw, 6 - bed, 7 - slide box, 9 - tailstock, 10 - auxiliary chuck, 11 - right base, 12 - core rod, 13 - tungsten rod, 14 - tungsten wire row, 15 - clamping cylinder, 16 - telescopic rod, 17 - ultrasonic transducer, 18 - amplitude rod, 19 - clamping wheel, 20 - clamping cylinder, 21 - guide rail, 22 - welding pressure head, 23 - diamond pressure head, 24 - convex cone edge. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings: Example 1: Refer to the attached Figures 1 to 5 .

[0021] A tungsten rod with an outer diameter of 24 mm and a length of 300 mm is manufactured by an additive method of stacking tungsten wire bundles by ultrasonic welding. The specific method is to first lay the tungsten wire in an orderly manner outside a straightened high-strength tungsten core rod with a diameter of 5 mm and a length of 350 mm, and then use an ultrasonic welding machine to weld the tungsten wire and the tungsten core rod into one, and then lay the wire layer by layer and weld until the diameter meets the design requirements. The main body of the welding equipment used borrows from a traditional lathe, including a left base 1, a right base 11, a bed 6, a spindle box 2, a feed box 4, a slide box 7, a tailstock 9, a slide box 8, an ultrasonic welding head and a servo control system. The bed 6 is installed on the left base 1 and the right base 11, the spindle box 2 is installed above the left base 1, the feed box 4 is installed on the side of the left base 1 and is connected to the lead screw 5 on the side of the bed 6, and the tailstock 9 is set on the right side of the guide rail 21 on the bed. The main chuck 3 is provided outside the spindle box 2, and the auxiliary chuck 10 or the top is provided on the tailstock 9. The slide box 7 is arranged above the guide rail 21 of the bed, and the nut of the lead screw 5 is arranged on its side. A clamping cylinder 15 and an ultrasonic welding head are arranged on the slide box 7 on one side relative to the main axis, the ultrasonic welding head is installed at the telescopic end of the clamping cylinder 15, and the cylinder seat is installed on the slide box 7. A clamping cylinder 20 and a clamping pressure wheel 19 are arranged on the other side relative to the main axis of the slide box 7, the clamping pressure wheel 19 is installed at the telescopic end of the clamping cylinder 20, and the cylinder seat is installed on the slide box 7. The ultrasonic welding head includes an ultrasonic transducer 17, an amplitude transformer 18 and a welding pressure head 22. The front end of the welding pressure head 22 is inlaid with a diamond pressure head 23, and the diamond pressure head 23 is fixed at the end of the amplitude transformer 18. The welding surface of the diamond pressure head 23 is generally a plane, and its center is facing the main axis. There is a convex cone edge 24 with a triangular cross section and a height of about 0.3 mm in the middle of the welding surface of the diamond pressure head 23 along the circumferential direction of the tungsten rod. The servo control system of the equipment and the excitation power supply of the ultrasonic transducer are arranged in a separate control box.

[0022] First, straighten the heat-treated cold-drawn ∅0.5mm high-strength tungsten wire and cut it according to the designed length, then lay these tungsten wires neatly and tightly in a row, and then use several single-sided tapes to stick the straightened round or rectangular cross-section tungsten wires to the unidirectional tungsten wire row at a certain interval. Clamp the two ends of the high-strength tungsten mandrel with an outer diameter of 5mm and a length of 350mm on the main chuck and the auxiliary chuck, and then cut an appropriate amount of unidirectional tungsten wire row and wrap it tightly on the outside of the mandrel with tape. Tear off a section of the back tape of the unidirectional tungsten wire row from one end piece by piece and use another narrow tape with a width of 4.5mm to re-wrap the tungsten wire on the outside of the mandrel, open the control valve of the cylinder, so that the diamond pressure head of the ultrasonic welding head and the opposite pressing wheel are relatively pressed on the exposed tungsten wire, and the thrust of the opposite welding head pressing cylinder and the pressing wheel pressing cylinder is the same when working. Then start the spindle servo motor, feed servo motor and ultrasonic transducer excitation power supply to start working. The spindle servo motor drives the core rod to rotate through the main chuck and the feed servo motor drives the ultrasonic welding head to move axially. Set the appropriate spindle servo motor and feed servo motor speeds so that the center of the diamond indenter of the ultrasonic welding head makes a spiral motion with a pitch of 5mm relative to the core rod. After the ultrasonic transducer is electrically excited, it generates a high-frequency expansion and contraction with a frequency of 20kHz, which is amplified by the resonance of the amplitude transformer and applied to the tungsten wire through the diamond indenter. Under the high-frequency strong forging and pressure of the diamond indenter, the tungsten wire undergoes atomic mutual diffusion at the interface with the core rod to form a strong bond. After a layer of tungsten wire is completely welded, re-cut an appropriate amount of unidirectional tungsten wire rows and repeat the above operation until the diameter of the welded tungsten rod meets the design requirements.

[0023] Ultrasonic welding will not anneal the tungsten wire due to high temperature like other welding methods, and will not reduce the strength of the tungsten wire. The tungsten rod made is tougher, and the tensile strength, compressive strength and bending strength are significantly better than sintered tungsten rods and depleted uranium rods. The density of the tungsten rod made by simply using high-density, high-purity tungsten wire as raw material is higher than the density of depleted uranium. By controlling the walking pitch of the welding head and the shape of the pressure surface of the welding head, weak force grooves can be prefabricated at a certain interval on each tungsten wire, so that the chip breaking length can be controlled and the tungsten rod can obtain the best self-sharpening. Using this method to replace the tungsten wire with high-strength steel wire, the steel rod produced also has self-sharpening properties during high-speed impact, and can also significantly increase the penetration depth.

[0024] Example 2: Refer to the attached Figures 1 to 5 .

[0025] A tungsten rod with an outer diameter of 20 mm and a length of 300 mm is manufactured by an additive method of stacking tungsten wire bundles by ultrasonic welding. The specific method is to first lay the tungsten wires in an orderly manner outside a straightened high-strength tungsten core rod with a diameter of 5 mm and a length of 350 mm, and then use an ultrasonic welding machine to weld the tungsten wires and the tungsten core rod into one body, and then lay the wires layer by layer and weld until the diameter meets the design requirements. The welding equipment used includes a base, a bed, a spindle box, a feed box, a slide box, a tailstock, a slide box, an ultrasonic welding head and a servo control system. The bed is installed on the left and right bases, the spindle box is installed above the left base, the feed box is installed on the side of the base and connected to the screw on the side of the bed, and the tailstock is set on the right side of the bed rail. A main chuck is provided outside the spindle box, and a secondary chuck or a top is also provided on the tailstock. The slide box is arranged above the guide rail of the bed, and a nut for the feed screw is provided on its side. A cylinder and an ultrasonic welding head are provided on one side of the slide box relative to the main axis, the ultrasonic welding head is installed at the telescopic end of the cylinder, and the cylinder seat is installed on the slide box. A cylinder and a pressing wheel are provided on the other side of the slide box relative to the main axis, the pressing wheel is installed at the telescopic end of the cylinder, and the cylinder seat is installed on the slide box. The pressure of the opposing welding head pressing cylinder and the pressing wheel pressing cylinder is the same. The ultrasonic welding head includes an ultrasonic transducer, a horn and a diamond roller. The diamond roller is installed at the end of the horn through a sliding bearing. The welding surface of the diamond roller is generally a cylindrical surface, and there is a convex cone edge ring with a height of about 0.2mm and a cross-section of an equilateral triangle in the middle of the cylindrical surface. The servo control system of the equipment and the excitation power supply of the ultrasonic transducer are arranged in a separate control box.

[0026] First, straighten the heat-treated ￠0.4mm rectangular high-strength tungsten wire and cut it according to the designed length, then lay these tungsten wires neatly and tightly in a row, and then use several single-sided tapes to stick the straightened round or rectangular cross-section tungsten wires at a certain distance to form a unidirectional tungsten wire row. Clamp the two ends of the high-strength tungsten core rod with an outer diameter of 5mm and a length of 350mm on the main chuck and the auxiliary chuck, and then cut an appropriate amount of unidirectional tungsten wire row and wrap it tightly on the outside of the core rod with tape. Tear off the adhesive tape of a unidirectional tungsten wire row from one end and use another narrow tape with a width of 5mm to re-wrap the tungsten wire around the outside of the mandrel. Open the control valve of the cylinder so that the diamond roller of the ultrasonic welding head and the top pressing wheel opposite to it are relatively pressed on the exposed tungsten wire. Then start the spindle servo motor, feed servo motor and the excitation power supply of the ultrasonic transducer to start working. The spindle servo motor drives the mandrel to rotate and the feed servo motor drives the ultrasonic welding head to move axially through the main chuck. Set the appropriate spindle servo motor and feed servo motor speeds so that the center of the diamond indenter of the ultrasonic welding head makes a spiral motion with a pitch of 6mm relative to the mandrel. After being electrically excited, the ultrasonic transducer generates a high-frequency expansion and contraction at a frequency of 35kHz, which is amplified by the resonance of the horn and applied to the tungsten wire through the diamond indenter. Under the high-frequency strong forging and pressure of the diamond indenter, the tungsten wire undergoes atomic mutual diffusion at the interface with the mandrel to form a strong bond. After a layer of tungsten wire is completely welded, re-cut an appropriate amount of unidirectional tungsten wire and repeat the above operation until the diameter of the welded tungsten rod meets the design requirements. In addition to the core rod, each tungsten wire on the tungsten rod made in this way has a weak force groove every 6mm. When one end is subjected to high-speed impact, the tungsten wire on the outside of the front section of the tungsten rod that invades the steel plate will break at the weak force groove at the front of the tungsten wire under the outward stress and become debris, thus avoiding the formation of mushroom heads and keeping the diameter of the tungsten rod basically unchanged, thereby significantly improving the penetration depth.

[0027] Unlike other welding methods, ultrasonic welding will not anneal the tungsten wire due to high temperature, nor will it reduce the strength of the tungsten wire. The resulting tungsten rod is tougher, and its tensile strength, compressive strength and bending strength are significantly better than those of sintered tungsten rods and depleted uranium rods. The density of the tungsten rod produced by simply using high-density, high-purity tungsten wire as raw material is higher than that of depleted uranium. By controlling the walking pitch of the welding head and the shape of the welding head pressure surface, weak force grooves can be prefabricated at a certain interval on each tungsten wire, so that the chip breaking length can be controlled, so that the tungsten alloy that does not have self-sharpening properties can also obtain excellent self-sharpening properties. Example 3, see attached Figure 4 , Figure 6 , Figure 7A ￠9mm tungsten rod is manufactured by the "twisting + welding" method, using a ￠0.4mm cold-drawn embossed tungsten wire. After cold drawing, the tungsten wire first passes through a pair of opposing embossed rollers to make a weak force groove every 5mm on the surface of the tungsten wire. Usually, the depth of the weak force groove is no more than 2 / 3 of the diameter of the tungsten wire. Such tungsten wire is passed through multiple coaxial frame stranding machines (stranding equipment for round-section cable production) to twist the tungsten wire layers layer by layer at a certain winding angle into a round rod. A laser welding head or ultrasonic welding head that can rotate around the round rod is set next to the outlet of each stranding machine to perform spiral welding on the newly stranded tungsten wire to form a dense and hard tungsten rod.

[0028] Example 4, see attached Figure 4 , Figure 7 . A ￠18mm tungsten rod is manufactured by the "pultrusion" method. The raw material is cold-drawn ￠0.3mm tungsten wire. After being pressed through a weak force groove with a spacing of 3mm and an indentation of 0.1mm, it is chemically plated with B10 copper-nickel alloy with a layer thickness of 3μm. 3460 such copper-plated tungsten wires and bundles are passed through a circular drawing die. One end is clamped with a chuck and connected to a traction machine. An induction heating device is provided at the entrance of the drawing die, which can quickly heat the tungsten wire bundle to 950℃~1000℃. The traction machine is started to pull the tungsten wire out of the drawing die. Under the strong extrusion of the drawing die, the metal coating alloy that is already close to melting fuses with each other; an air cooling device is provided at the exit of the drawing die to cool the pultruded tungsten wire bundle to form a dense and hard tungsten rod.

[0029] The above is only the most typical specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Due to space limitations, the production steps of the traditional process used are not described in detail, but it does not mean that the omitted process steps do not exist. The listed data are only for describing the working principle of the present invention and do not represent necessary values. Any technician familiar with 3D printing, armor-piercing rod manufacturing and related fields can easily think of equivalent changes and their applications within the technical scope disclosed by the present invention, which should be covered within the scope of the claims of the present invention.

Claims

1. A method for manufacturing a tungsten rod, characterized in that: The invention adopts an additive manufacturing method in which tungsten wire bundles are stacked and formed by ultrasonic welding. First, the tungsten wires (14) are laid out in an orderly and tight manner on the outside of a high-strength tungsten core rod (12) with a relatively thin diameter. Then, the tungsten wires (14) and the tungsten core rod (12) are welded into one piece using an ultrasonic welding head. Then, the wires are laid out layer by layer and welded until the diameter meets the design requirements.

2. The method for manufacturing a tungsten rod according to claim 1, characterized in that: Tungsten rods are manufactured by the "twisting + welding" method. The tungsten wires are twisted layer by layer into a round rod according to the set winding angle through multiple coaxially arranged stranding machines. A laser welding head or ultrasonic welding head that can rotate around the round rod is set next to the outlet of each stranding machine to perform spiral welding on the newly twisted tungsten wires to form a dense and hard tungsten rod.

3. The method for manufacturing a tungsten rod according to claim 1, characterized in that: Tungsten rod adopts "pultrusion" method to arrange a certain number of tungsten wires which are pre-plated with lower melting point alloy and processed with weak force grooves at set intervals, and pass through the circular drawing die in order. One end is clamped with a chuck and pulled out from the drawing die by a traction machine. An induction heating device is installed at the entrance of the drawing die, which can quickly heat the tungsten wire bundle to the melting point of the coating metal. An air cooling device is installed at the exit of the drawing die to cool the pultruded tungsten wire bundle to form a dense and hard tungsten rod.

4. A tungsten rod, characterized in that: The tungsten rod is prepared according to the manufacturing method of any one of claims 1 to 3.

5. A tungsten rod welding device according to claim 1, characterized in that: The invention comprises a left base (1), a right base (11), a bed (6), a spindle box (2), a feed box (4), a slide box (7), a tailstock (9) and an ultrasonic welding head; the bed (6) is mounted on the left base (1) and the right base (11); the spindle box (2) is mounted above the left base (1); the feed box (4) is mounted on the side of the left base (1) and connected to a lead screw (5) on the side of the bed (6); the feed box (4) can drive the lead screw (5) to rotate; the tailstock (9) is mounted above the right base (11); the tungsten rod is mounted between the tailstock (9) and the spindle box (2); and the ultrasonic welding head is mounted on the slide box (7); A spindle servo motor and a feed servo motor are respectively arranged in the spindle box (2) and the feed box (4); a main chuck (3) is arranged outside the spindle box (2), a sub-chuck (10) or a center is arranged on the tailstock (9), and a core rod (12) is installed between the main chuck (3) and the sub-chuck (10) or the center; a guide rail (21) is arranged on the upper surface of the bed (6), a slide box (7) is arranged above the guide rail (21), and the screw thread of the lead screw (5) and the slide box (7) are matched and connected; a clamping cylinder (15) and an ultrasonic welding head are arranged on one side of the slide box (7) relative to the main axis, and the ultrasonic welding head is installed on the telescopic end of the clamping cylinder (15); a clamping cylinder (20) and a clamping pressure wheel (19) are arranged on the other side of the slide box (7) relative to the main axis, and the clamping pressure wheel (19) is installed on the telescopic end of the clamping cylinder (20).

6. The tungsten rod welding equipment according to claim 5, characterized in that: The tungsten wire used in additive manufacturing is a tungsten wire row (14) in which straightened circular or rectangular cross-section tungsten wires are bonded on one side at a certain interval using a plurality of single-sided adhesive tapes to form a tightly parallel arrangement.

7. The tungsten rod welding equipment according to claim 5, characterized in that: The ultrasonic welding head comprises an ultrasonic transducer (17), an horn (18) and a welding pressure head (22); a diamond pressure head (23) is embedded at the front end of the welding pressure head (22); the welding pressure head (22) is fixed to the end of the horn (18); the welding surface of the diamond pressure head (23) is generally flat, and its center is directly opposite to the main axis.

8. The tungsten rod welding equipment according to claim 7, characterized in that: A convex cone edge (24) with a triangular cross section is provided in the middle of the welding surface of the diamond indenter (23) along the circumferential direction of the tungsten rod.

9. The tungsten rod welding equipment according to claim 1, characterized in that: The ultrasonic welding head comprises at least one rolling welding head, the pressure wheel of the rolling welding head is made of cemented carbide, the pressure welding wheel rim of the pressure wheel is an integral circular ring made of polycrystalline diamond, the outer side of the circular ring is basically a cylindrical surface, the outer end face of the circular ring has a rounded corner, and the outer surface of the circular ring has a convex cone edge with a triangular cross section along the circumferential direction.

10. The tungsten rod welding equipment according to claim 5, characterized in that: On the special tungsten rod ultrasonic welding machine, a reciprocating wire laying head parallel to the main axis is provided, and radial wire hanging teeth are provided at both ends of the tooling.

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