Cold crucible drop melting rod pulling device and rod pulling method

Abstract

The invention relates to a cold crucible drop melting and rod pulling device and method, the cold crucible drop melting and rod pulling device comprises a feeding cavity, a smelting cavity, a rod pulling cavity, a feeding mechanism, a crucible, a conical heating part, a rod pulling mechanism and a rod pulling rod set, and the feeding cavity and the rod pulling cavity are installed at the upper end and the lower end of the smelting cavity respectively and communicate with the smelting cavity; the feeding end of the feeding mechanism is located in the feeding cavity and used for conveying raw material ingots downwards into the smelting cavity. The conical heating part and the crucible are installed in the smelting cavity up and down, an upper opening of the crucible corresponds to the closing end of the conical heating part and receives a raw material ingot solution heated and dripped by the conical heating part, and the flaring end of the conical heating part corresponds to the feeding end and conducts annular conical heating on a fed raw material ingot; the upper end of the rod pulling rod set is located in the rod pulling cavity and can be inserted into the lower opening of the crucible in a matched mode, and the movable end of the rod pulling mechanism is connected with the lower end of the rod pulling rod set and drives the rod pulling rod set to move up and down for rod pulling.

Description

Technical Field

[0001] The invention relates to the technical field of alloy smelting and preparation, and in particular to a cold crucible drip melting rod drawing device and a rod drawing method. Background Art

[0002] At present, the preparation of small-diameter alloy bars with a diameter of less than 100 mm mostly adopts the method of vacuum consumable melting combined with forging. First, large-diameter alloy ingots are made by vacuum consumable melting, and then small-diameter alloy bars are formed by forging. However, for the preparation of bars of some difficult-to-forge materials, the forging process is very difficult. For example, for high-temperature alloys such as titanium alloys and nickel-based alloys, they are easy to soften, sinter, and oxidize at high temperatures. The metal fluidity is poor, the process is complicated and requires multiple forgings, the forging loss is large, and the forging difficulty is high. For materials with high brittleness, high hardness, and poor toughness, forging is prone to produce obvious defects and low yield. At the same time, the control of temperature, the control of forging pressure, and the preparation of molds during forging also make the forging process complicated and costly. Summary of the invention

[0003] In order to solve one or more technical problems existing in the prior art, the present invention provides a cold crucible drip melting rod drawing device and a rod drawing method.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: a cold crucible drip melting rod drawing device, comprising a feeding cavity, a smelting cavity, a rod drawing cavity, a feeding mechanism, a crucible, a conical heating portion, a rod drawing mechanism and a rod drawing rod group, wherein the feeding cavity and the rod drawing cavity are respectively installed at the upper end and the lower end of the smelting cavity and are both connected to the smelting cavity; The feeding end of the feeding mechanism is located in the feeding cavity and is used to transport the raw material ingot downward into the smelting cavity; the conical heating part and the crucible are installed up and down in the smelting cavity, the upper opening of the crucible corresponds to the closing end of the conical heating part and receives the raw material ingot solution heated and dripped by the conical heating part, the flared end of the conical heating part is arranged corresponding to the feeding end and performs circular conical heating on the fed raw material ingot; the upper end of the rod pulling rod group is located in the rod pulling cavity and can be adapted to be inserted into the lower opening of the crucible, the moving end of the rod pulling mechanism is connected to the lower end of the rod pulling rod group and drives the rod pulling rod group to move up and down to pull the rod.

[0005] The beneficial effects of the present invention are as follows: the cold crucible drip melting rod drawing device of the present invention feeds the raw material ingot into the conical heating part through the feeding mechanism, induction heats the lower end of the raw material ingot to melt it, and the molten droplets continuously drip into the crucible (a water-cooled copper crucible may be selected), and the lower end of the raw material ingot is induction heated by the conical heating part to melt it to form molten droplets, which drip into the crucible, so that the inner diameter of the crucible can be reduced, and is not limited by the size of the raw material, so that small diameter rods can be pulled out.

[0006] In the present invention, the lower end of the raw material ingot can be set as a conical surface, and the conical surface of the raw material ingot is inductively heated by the conical heating part to melt and form molten droplets, which drip along the cone tip into the crucible.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, a crucible heating part is also provided in the smelting cavity, and the crucible includes a heat preservation section and a solidification section which are connected integrally in sequence from top to bottom. The crucible heating part is connected to the heat preservation section and further melts and keeps warm the raw material ingot solution dripping into the heat preservation section. The depth of the upper end of the rod pulling group inserted into the crucible does not exceed the length of the solidification section. The length of the heat preservation section accounts for 1 / 2 to 2 / 3 of the length of the crucible, and the length of the solidification section accounts for 1 / 3 to 1 / 2 of the length of the crucible.

[0009] The beneficial effect of adopting the above further solution is that by providing the heat preservation section and the solidification section, the droplets dripping into the crucible can be further heated and solidified at the upper end of the rod puller assembly at the bottom of the crucible.

[0010] Furthermore, the crucible heating part comprises an induction coil, and the induction coil ring is arranged on the outer wall of the heat preservation section and passes through the smelting cavity to be connected to a power source.

[0011] Furthermore, a clamping interface is provided at the upper end of the rod pulling rod group, and the raw material ingot solution in the crucible can be solidified and clamped in the clamping interface.

[0012] Furthermore, the rod pulling group includes a rod pulling body and a rod pulling head, the movable end of the rod pulling mechanism is connected to the lower end of the rod pulling body, the rod pulling head is detachably and sealably connected to the upper end of the rod pulling body, and the rod pulling head can be adapted to be inserted into the lower opening of the crucible.

[0013] The beneficial effect of adopting the above further solution is that by providing a pull rod body and a pull rod head that are detachably sealed and connected, it is convenient to replace different pull rod heads according to the pull rod requirements.

[0014] Furthermore, the pull rod body is a hollow structure, and a cooling water pipe is provided in the hollow structure of the pull rod body. The lower end of the cooling water pipe is sealed and passes through the lower end of the pull rod body and serves as a cooling water inlet. A return water gap is reserved between the upper end of the cooling water pipe and the pull rod head. An annular return water gap is formed between the cooling water pipe and the pull rod body, and a return water port is provided on the outer wall of the lower end of the pull rod body.

[0015] The beneficial effect of adopting the above-mentioned further scheme is: by setting up a cooling water pipe, a double-layer water-cooling structure can be formed between the pull rod body, and water enters through the central cooling water pipe, the cooling water enters the pull rod head, and then returns from the annular return water gap formed between the side wall and the cooling water pipe, thereby achieving cooling of the pull rod head and the pull rod body.

[0016] Furthermore, the crucible is a cylindrical structure with a uniform inner diameter from top to bottom; The conical heating portion includes a conical coil; A first vacuum gate valve for controlling on and off is provided between the feeding cavity and the smelting cavity; a second vacuum gate valve for controlling on and off is provided between the smelting cavity and the rod drawing cavity.

[0017] The beneficial effect of adopting the above-mentioned further scheme is: by setting the first vacuum gate valve and the second vacuum gate valve, the on-off operation of the feeding chamber, the smelting chamber and the rod drawing chamber is convenient, so that the loading of raw ingots, smelting and taking out of finished rods do not interfere with each other. Each cavity can be evacuated independently, which greatly saves the evacuation time, and realizes that multiple rods can be pulled out continuously by loading the raw materials once, and the preparation efficiency is high; compared with the existing forging and machining, the utilization rate of the raw ingots is higher and the cost is lower.

[0018] Further, the feeding mechanism comprises a first screw nut driving part, a cylinder, a clamping connecting rod and a mounting tube, the driving end of the first screw nut driving part is connected to and drives the cylinder and the mounting tube to move up and down, the mounting tube is arranged vertically, the lower end of the mounting tube is sealed and passes through the feeding cavity and is located in the feeding cavity, the output shaft of the cylinder passes through the mounting tube downward and is hinged to the upper end of the clamping connecting rod, the lower end of the mounting tube is connected to a mounting plate, the middle part of the clamping connecting rod is hinged to the mounting plate, and the lower end of the clamping connecting rod forms a clamping feeding end for clamping the raw material ingot; The rod pulling mechanism comprises a second lead screw nut driving part, a driving end of which is connected to the rod pulling rod group and drives the rod pulling rod group to move up and down.

[0019] A rod drawing method using the cold crucible drip melting rod drawing device comprises the following steps: S1, installing the raw material ingot on the feeding end of the feeding mechanism, evacuating the feeding cavity, the melting cavity and the rod drawing cavity and introducing inert gas respectively; S2, using a feeding mechanism to transport the raw material ingot downward into the smelting chamber, and moving it from the expanded end of the conical heating part into the conical heating part, the conical heating part heats the raw material ingot to melt the lower end of the raw material ingot, and the raw material ingot solution continuously drips into the crucible from the closing end of the conical heating part, solidifies at the upper end of the rod pulling mechanism and is clamped and fixed; S3, the rod pulling mechanism pulls the rod downwards. After the first rod is pulled, the feeding chamber and the smelting chamber are closed, and the rod pulling chamber is opened to take out the material; S4, the rod pulling cavity is evacuated again and inert gas is introduced, and the cycle operation is continued for the second rod pulling.

[0020] The beneficial effects of the present invention are as follows: the rod drawing method of the present invention has a simple process, and the process of rod drawing can be automated by setting the power supply power, feeding speed and rod drawing speed in advance, and no human operation is required during the rod drawing process.

[0021] In S1, the lower end of the raw material ingot is provided with a conical surface; In S2, the conveying speed of the raw material ingot is 0.2~20mm / min; In S3, the rod pulling speed of the rod pulling mechanism is 0.5~50mm / min.

[0022] The beneficial effect of adopting the above further solution is that the lower end of the raw material ingot is set as a conical surface, which is convenient for heating, and the molten droplet can drip along the cone tip into the crucible. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic cross-sectional view of the cold crucible drip melting rod drawing device of the present invention; Figure 2 for Figure 1 The enlarged structural diagram of the middle A part; Figure 3 for Figure 1 A schematic diagram of the enlarged structure of the middle B part; Figure 4 for Figure 1 The enlarged structural diagram of the middle C part; Figure 5 for Figure 1 The enlarged structural diagram of the middle D part; Figure 6 for Figure 1 The enlarged structural diagram of the middle E part; Figure 7 for Figure 1 Schematic diagram of the enlarged structure of part F in the middle.

[0024] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 100, feeding cavity; 101, raw material ingot; 102, first vacuum gate valve; 200, smelting chamber; 201, second vacuum gate valve; 300, rod pulling cavity; 400, feeding mechanism; 401, first motor; 402, first nut; 403, first lead screw; 404, first slide rail; 405, first slider; 406, first connecting plate; 407, cylinder; 408, mounting tube; 409, clamping connecting rod; 410, assembly plate; 500, crucible; 501, induction coil; 600, conical coil; 700, rod pulling mechanism; 701, second motor; 702, second nut; 703, second lead screw; 704, second slide rail; 705, second slider; 706, second connecting plate; 800, tie rod assembly; 801, tie rod body; 802, tie rod head; 803, card interface; 804, sealing ring; 805, cooling water pipe; 806, cooling water inlet; 807, annular water return interval; 808, water return port. DETAILED DESCRIPTION

[0025] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0026] like Figure 1 to Figure 7 As shown, a cold crucible drip melting rod drawing device of this embodiment includes a feeding cavity 100, a smelting cavity 200, a rod drawing cavity 300, a feeding mechanism 400, a crucible 500, a conical heating portion, a rod drawing mechanism 700 and a rod drawing rod group 800, wherein the feeding cavity 100 and the rod drawing cavity 300 are respectively installed at the upper end and the lower end of the smelting cavity 200 and are both connected to the smelting cavity 200; The feeding end of the feeding mechanism 400 is located in the feeding cavity 100 and is used to transport the raw material ingot downward into the smelting cavity 200; the conical heating part and the crucible 500 are installed up and down in the smelting cavity 200, the upper opening of the crucible 500 corresponds to the closing end of the conical heating part and receives the raw material ingot solution heated and dripped by the conical heating part, the flared end of the conical heating part is arranged corresponding to the feeding end and performs annular conical heating on the raw material ingot 101 fed in; the upper end of the rod pulling rod group 800 is located in the rod pulling cavity 300 and can be adapted to be inserted into the lower opening of the crucible 500, the moving end of the rod pulling mechanism 700 is connected to the lower end of the rod pulling rod group 800 and drives the rod pulling rod group 800 to move up and down to pull the rod.

[0027] The crucible 500 used in this embodiment is a water-cooled copper crucible, the upper end of the water-cooled copper crucible is a cooling water jacket, the lower end is the crucible body, and a petal-type water-cooling structure is adopted. A crucible water shaft connected to the water-cooling structure on the water-cooled copper crucible can be arranged in the smelting cavity 200.

[0028] like Figure 4As shown, the smelting cavity 200 of this embodiment is further provided with a crucible heating part, and the crucible 500 includes an insulation section and a solidification section which are integrally connected in sequence from top to bottom. The crucible heating part is connected to the insulation section and further melts and keeps warm the raw material ingot solution dripping into the insulation section. The depth of the upper end of the pulling rod group 800 inserted into the crucible 500 does not exceed the length of the solidification section. By providing the insulation section and the solidification section, it is convenient to further heat the droplets dripping into the crucible, and solidify them at the upper end of the pulling rod group at the bottom of the crucible.

[0029] Optionally, the length of the insulation section accounts for 1 / 2 to 2 / 3 of the length of the crucible 500, preferably 2 / 3, which can further melt and insulate the dripping raw material ingot droplets. The length of the solidification section accounts for 1 / 3 to 1 / 2 of the length of the crucible 500. Further melting and insulation are carried out in a water-cooled copper crucible, and the rod is pulled downward by a rod pulling mechanism. The melt enters the solidification and crystallization zone for solidification, and the material is continuously fed and the rod is continuously pulled. The prepared rod has a uniform and dense structure, no defects such as cracks, and good surface quality. The whole process can be completed in a vacuum argon-filled environment, using a water-cooled copper crucible for smelting, and the prepared rod is free of oxidation and other pollution.

[0030] like Figure 4 As shown, the crucible heating part of this embodiment includes an induction coil 501, which is arranged on the outer wall of the insulation section and passes through the smelting cavity 200 to be connected to the power supply. The upper end of the rod pulling assembly is inserted into the solidification section, and the solidification section is not wound with the induction coil. The upper end of the rod pulling assembly is consistent with the inner diameter of the crucible 500. Crucibles with different inner diameters can be matched with the corresponding rod pulling assembly to pull out rods with corresponding outer diameters.

[0031] like Figure 5 As shown, a clamping interface 803 is provided at the upper end of the rod puller assembly 800 of this embodiment, and the raw material ingot solution in the crucible 500 can be solidified and clamped in the clamping interface 803 .

[0032] like Figure 5 and Figure 6 As shown, the rod pull rod assembly 800 of this embodiment includes a rod pull rod body 801 and a rod pull rod head 802. The movable end of the rod pull mechanism 700 is connected to the lower end of the rod pull rod body 801. The rod pull rod head 802 is detachably sealed and connected to the upper end of the rod pull rod body 801. The rod pull rod head 802 can be adapted to be inserted into the lower opening of the crucible 500. By providing a detachably sealed rod pull rod body and a rod pull rod head, it is convenient to replace different rod pull rod heads according to the rod pulling requirements.

[0033] like Figure 5 and Figure 6As shown, the rod body 801 of this embodiment is a hollow structure, and a cooling water pipe 805 is provided in the hollow structure of the rod body 801. The lower end of the cooling water pipe 805 is sealed and penetrates from the lower end of the rod body 801 and serves as a cooling water inlet 806. A return water gap is reserved between the upper end of the cooling water pipe 805 and the rod head 802. An annular return water interval 807 is formed between the cooling water pipe 805 and the rod body 801, and a return water port 808 is provided on the outer wall of the lower end of the rod body 801. By providing a cooling water pipe, a double-layer water cooling structure can be formed between the rod body and the rod body. Water enters the rod head through the central cooling water pipe, and then returns from the annular return water interval formed between the side wall and the cooling water pipe, thereby cooling the rod head and the rod body.

[0034] In this embodiment, the rod head 802 and the rod body 801 are connected by threads and sealed by a sealing ring 804. A card interface is processed at the top center of the rod head, and the card interface can preferably be a threaded port. After the molten metal enters the threaded port and solidifies, the connection is realized, and the rod can be pulled down. After the rod is pulled, the rod can be manually rotated to separate the rod from the rod head 802.

[0035] like Figure 4 As shown, a preferred solution of this embodiment is that the crucible 500 is a cylindrical structure with a uniform inner diameter from top to bottom; optionally, as Figure 4 As shown, the conical heating portion includes a conical coil 600 .

[0036] like Figure 1 As shown, specifically, a first vacuum gate valve 102 for controlling on and off is provided between the feeding cavity 100 and the smelting cavity 200; a second vacuum gate valve 201 for controlling on and off is provided between the smelting cavity 200 and the rod drawing cavity 300. By providing the first vacuum gate valve and the second vacuum gate valve, it is convenient to perform on and off operations on the feeding cavity, the smelting cavity and the rod drawing cavity, so that the loading of raw ingots, smelting and taking of finished rods are realized without interference, each cavity can be independently evacuated, which greatly saves the evacuation time, and realizes that multiple rods can be continuously pulled out by loading raw materials once, with high preparation efficiency; compared with the existing forging and machining, the utilization rate of raw ingots is higher and the cost is lower.

[0037] like Figure 1 and Figure 2As shown, a specific scheme of this embodiment is that the feeding mechanism 400 includes a first screw nut driving unit, a cylinder 407, a clamping link 409 and a mounting tube 408, the driving end of the first screw nut driving unit is connected to and drives the cylinder 407 and the mounting tube 408 to move up and down, the mounting tube 408 is arranged vertically, the lower end of the mounting tube 408 is sealed through the feeding cavity 100 and is located in the feeding cavity 100, the output shaft of the cylinder 407 downwardly passes through the mounting tube 408 and is hinged to the upper end of the clamping link 409, the lower end of the mounting tube 408 is connected to the mounting plate 410, the middle part of the clamping link 409 is hinged on the mounting plate 410, and the lower end of the clamping link 409 forms a clamping feeding end for clamping the raw material ingot 101. The clamping connecting rod 409 can adopt a scissors fork structure, the upper end of the scissors fork structure is hinged to one end of the two connecting rods respectively, the other ends of the two connecting rods are hinged to the output shaft of the cylinder 407, the middle hinge shaft of the scissors fork structure is hinged to the assembly plate 410, and the lower end of the scissors fork structure forms a clamping feeding end.

[0038] Specifically, Figure 1~Figure 3 As shown, the first screw and nut driving part of the present embodiment includes a first motor 401, a first nut 402, a first screw 403, a first slide rail 404 and a first slider 405. The lower end of the first slide rail 404 is fixed to the top of one side of the feeding chamber 100, the first motor 401 is installed on the top of the first slide rail 404, the upper end of the first screw 403 is fixedly connected to the output shaft of the first motor 401, the lower end of the first screw 403 is rotatably connected to the top of the feeding chamber 100, the first screw 403 and the first slide rail 404 are arranged in parallel and spaced apart, the first screw 403 is threadedly connected with the first nut 402, the first slide rail 404 is slidably connected with the first slider 405, the first nut 402 is fixedly connected to the first slider 405, the first nut 402 is also connected to the first connecting plate 406, and the cylinder 407 is installed on the first connecting plate 406.

[0039] like Figure 6 and Figure 7 As shown, the rod pulling mechanism 700 includes a second screw nut driving part, and the driving end of the second screw nut driving part is connected to the rod pulling rod group 800 and drives the rod pulling rod group 800 to move up and down.

[0040] Specifically, Figure 6As shown, the second screw and nut driving unit includes a second motor 701, a second nut 702, a second screw 703, a second slide rail 704, and a second slider 705. The bottom of the rod pulling cavity 300 is provided with a second slide rail 704, the upper end of the second slide rail 704 is fixedly connected to the bottom of the rod pulling cavity 300, the second motor 701 is fixed to the lower end of the second slide rail 704, the second screw 703 and the second slide rail 704 are arranged in parallel and spaced apart, the output shaft of the second motor 701 is fixedly connected to the lower end of the second screw 703, the upper end of the second screw 703 is rotatably connected to the bottom of the rod pulling cavity 300, the second screw 703 is threadedly connected with a second nut 702, the second nut 702 is connected with a second slider 705, the second slider 705 is slidably connected to the second slide rail 704, the second nut 702 is also connected with a second connecting plate 706, and the lower end of the rod pulling rod group 800 is connected to the second connecting plate 706.

[0041] The feeding mechanism 400 and the rod pulling mechanism 700 of this embodiment are both driven by a motor to move the lead screw. The corresponding feeding speed and rod pulling speed can be set according to the type of raw material ingot. The guide adopts a guide rail slider matching structure, which has good structural rigidity and stable guidance. The lower end of the raw material ingot is processed into a cone tip, and the edge is inserted into the conical coil for melting. The upper end of the raw material ingot can be clamped on the clamping connecting rod 409 of the feeding mechanism. The clamping connecting rod 409 is driven by a cylinder to achieve centering clamping, and raw material ingots of various sizes can be clamped. The melting of the raw material ingot adopts induction heating of the conical coil. The feeding mechanism smoothly delivers the raw material ingot to the conical coil, and the conical coil is connected to an external induction heating power supply. The conical coil melts the conical surface of the raw ingot through induction heating to form molten droplets, which drip along the tip of the cone. As the feeding mechanism continuously feeds the material into the conical coil, the ingot is continuously melted, and the molten droplets can continuously drip into the water-cooled copper crucible below. The inner diameter of the crucible can be reduced by melting and dripping into the crucible. It is not limited by the size of the raw material, and small diameter rods can be pulled out.

[0042] The cold crucible drip melting rod drawing device of this embodiment feeds the raw material ingot into the conical heating part through the feeding mechanism, induction heats the lower end of the raw material ingot to melt it, and the molten droplets continuously drip into the crucible (a water-cooled copper crucible can be selected). The lower end of the raw material ingot is melted by induction heating through the conical heating part to form molten droplets, which drip into the crucible, so that the inner diameter of the crucible can be reduced. It is not limited by the size of the raw material and small diameter rods can be pulled out.

[0043] This embodiment also provides a rod drawing method using the cold crucible drip melting rod drawing device, comprising the following steps: S1, installing the raw material ingot 101 at the feeding end of the feeding mechanism 400, evacuating the feeding cavity 100, the melting cavity 200 and the rod drawing cavity 300 respectively and introducing an inert gas, such as argon; S2, using the feeding mechanism 400 to transport the raw material ingot 101 downward into the smelting chamber 200, and move it from the expanded end of the conical heating part into the conical heating part, the conical heating part heats the raw material ingot 101, so that the lower end of the raw material ingot 101 is melted, and the raw material ingot solution continuously drips into the crucible from the closed end of the conical heating part, and solidifies and is clamped and fixed at the upper end of the rod pulling mechanism 700; S3, the rod pulling mechanism 700 pulls the rod downwards. After the first rod is pulled, the feeding cavity 100 and the smelting cavity 200 are closed, and the rod pulling cavity 300 is opened to take out the material; S4, the rod pulling cavity 300 is evacuated again and an inert gas is introduced, and the cycle operation is continued for the second rod pulling.

[0044] In S1 , the lower end of the raw material ingot 101 is provided with a conical surface; the lower end of the raw material ingot 101 is provided with a conical surface, which is convenient for heating, and the molten droplet can drip along the cone tip into the crucible 500 .

[0045] In S2, the conveying speed of the raw material ingot 101 is 0.2-20 mm / min; In S3, the rod pulling speed of the rod pulling mechanism 700 is 0.5-50 mm / min.

[0046] In the rod drawing method of this embodiment, after the raw material ingot solution is heated and kept warm in a water-cooled copper crucible, it is lowered through the rod drawing mechanism and enters the solidification crystallization zone (solidification section) for solidification. The feeding mechanism continuously feeds the material into the conical coil, and the molten droplets continuously fall into the water-cooled copper crucible to replenish the melt. The rod drawing mechanism can continuously pull the rod downward. After setting the feeding speed and the rod drawing speed, continuous and automatic rod drawing can be achieved until a rod is completed. The feeding speed and the rod drawing speed need to be set according to the raw material ingot material composition, the raw material ingot diameter, and the rod drawing diameter. The preparation process of the rod drawing method is simple. By setting the power supply power, feeding and rod drawing speed in advance, the process can be automated to complete the rod drawing, and no human operation is required during the process. A loading cavity, a smelting cavity, and a rod drawing cavity are set, and the two cavities are separated by a vacuum gate valve, so that the loading of raw materials, smelting, and taking of finished products do not interfere with each other. Each cavity can be evacuated separately, which greatly saves the vacuuming time, and realizes that multiple rods can be continuously pulled out after loading the raw materials once, and the preparation efficiency is high. Compared with forging and machining, it has high raw material utilization and low cost.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0052] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A cold crucible drip melting rod drawing device, characterized in that: It includes a feeding cavity, a smelting cavity, a rod drawing cavity, a feeding mechanism, a crucible, a conical heating portion, a rod drawing mechanism and a rod drawing rod group, wherein the feeding cavity and the rod drawing cavity are respectively installed at the upper end and the lower end of the smelting cavity and are both connected to the smelting cavity; The feeding end of the feeding mechanism is located in the feeding cavity and is used to transport the raw material ingot downward into the smelting cavity; the conical heating part and the crucible are installed up and down in the smelting cavity, the upper opening of the crucible corresponds to the closing end of the conical heating part and receives the raw material ingot solution heated and dripped by the conical heating part, the flared end of the conical heating part is arranged corresponding to the feeding end and performs circular conical heating on the fed raw material ingot; the upper end of the rod pulling rod group is located in the rod pulling cavity and can be adapted to be inserted into the lower opening of the crucible, the moving end of the rod pulling mechanism is connected to the lower end of the rod pulling rod group and drives the rod pulling rod group to move up and down to pull the rod.

2. A cold crucible drip melting rod drawing device according to claim 1, characterized in that: The smelting cavity is also provided with a crucible heating part, the crucible includes a heat preservation section and a solidification section which are connected in sequence from top to bottom, the crucible heating part is connected to the heat preservation section and further melts and keeps warm the raw material ingot solution dripping into the heat preservation section, and the depth of the upper end of the rod pulling group inserted into the crucible does not exceed the length of the solidification section; The length of the heat preservation section accounts for 1 / 2 to 2 / 3 of the length of the crucible, and the length of the solidification section accounts for 1 / 3 to 1 / 2 of the length of the crucible.

3. A cold crucible drip melting rod drawing device according to claim 2, characterized in that: The crucible heating part comprises an induction coil, which is arranged on the outer wall of the heat preservation section and passes through the smelting cavity to be connected with a power source.

4. A cold crucible drip melting rod drawing device according to claim 1, characterized in that: A clamping interface is provided at the upper end of the rod pulling rod group, and the raw material ingot solution in the crucible can be solidified and clamped in the clamping interface.

5. The cold crucible drip melting rod drawing device according to claim 1, characterized in that: The rod puller assembly includes a rod puller body and a rod puller head. The movable end of the rod puller mechanism is connected to the lower end of the rod puller body. The rod puller head is detachably and hermetically connected to the upper end of the rod puller body. The rod puller head can be adapted to be inserted into the lower opening of the crucible.

6. A cold crucible drip melting rod drawing device according to claim 5, characterized in that: The rod puller body is a hollow structure, and a cooling water pipe is arranged in the hollow structure of the rod puller body. The lower end of the cooling water pipe is sealed and passes through the lower end of the rod puller body and serves as a cooling water inlet. A return water gap is reserved between the upper end of the cooling water pipe and the rod puller head, and an annular return water gap is formed between the cooling water pipe and the rod puller body. A return water port is arranged on the outer side wall of the lower end of the rod puller body.

7. The cold crucible drip melting rod drawing device according to claim 1, characterized in that: The crucible is a cylindrical structure with a uniform inner diameter from top to bottom; The conical heating portion includes a conical coil; A first vacuum gate valve for controlling on and off is provided between the feeding cavity and the smelting cavity; a second vacuum gate valve for controlling on and off is provided between the smelting cavity and the rod drawing cavity.

8. The cold crucible drip melting rod drawing device according to claim 1, characterized in that: The feeding mechanism comprises a first screw nut driving part, a cylinder, a clamping connecting rod and a mounting tube, the driving end of the first screw nut driving part is connected to and drives the cylinder and the mounting tube to move up and down, the mounting tube is arranged vertically, the lower end of the mounting tube is sealed and passes through the feeding cavity and is located in the feeding cavity, the output shaft of the cylinder passes through the mounting tube downward and is hinged to the upper end of the clamping connecting rod, the lower end of the mounting tube is connected to a mounting plate, the middle part of the clamping connecting rod is hinged to the mounting plate, and the lower end of the clamping connecting rod forms a clamping feeding end for clamping the raw material ingot; The rod pulling mechanism comprises a second lead screw nut driving part, a driving end of which is connected to the rod pulling rod group and drives the rod pulling rod group to move up and down.

9. A rod drawing method using the cold crucible drip melting rod drawing device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, installing the raw material ingot on the feeding end of the feeding mechanism, evacuating the feeding cavity, the melting cavity and the rod drawing cavity and introducing inert gas respectively; S2, using a feeding mechanism to transport the raw material ingot downward into the smelting chamber, and moving it from the expanded end of the conical heating part into the conical heating part, the conical heating part heats the raw material ingot to melt the lower end of the raw material ingot, and the raw material ingot solution continuously drips into the crucible from the closing end of the conical heating part, solidifies at the upper end of the rod pulling mechanism and is clamped and fixed; S3, the rod pulling mechanism pulls the rod downwards. After the first rod is pulled, the feeding chamber and the smelting chamber are closed, and the rod pulling chamber is opened to take out the material; S4, the rod pulling cavity is evacuated again and inert gas is introduced, and the cycle operation is continued for the second rod pulling.

10. The rod drawing method according to claim 9, characterized in that: In S1, the lower end of the raw material ingot is provided with a conical surface; In S2, the conveying speed of the raw material ingot is 0.2~20mm / min; In S3, the rod pulling speed of the rod pulling mechanism is 0.5~50mm / min.

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