Atomizing device for increasing the diameter and reducing the porosity of a spray formed deposit

Abstract

The present application relates to a kind of atomizing device for increasing the diameter of spray forming deposit and reducing porosity, comprising: multiple nozzle type pouring mechanism, swing type atomizing mechanism and rotary lifting type deposition disc;Rotary lifting type deposition disc is set in the spraying distance and spraying area range of multiple nozzle type pouring mechanism;Swing type atomizing mechanism is used to adjust the swing amplitude of atomizing nozzle in multiple nozzle type pouring mechanism, and the spraying angle and number of atomizing nozzle are matched with the sand molding of tundish and the position of pouring nozzle;Swing type atomizing mechanism is also provided with rotary servo motor and crank rocker mechanism.The beneficial effects of the present application are: the atomizing device used, by setting swing type atomizing mechanism, by setting the parameters of crank rocker mechanism in swing type atomizing mechanism, driving the reciprocating swing of air nozzle flat shaft within a certain angle, adjusting the spraying angle and swing amplitude of atomizing nozzle, and the spraying angle and swing amplitude of atomizing nozzle determine the width of spraying coating area.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of metal spray forming, and particularly relates to an atomizing device for increasing the diameter of a spray forming deposition body and reducing porosity. BACKGROUND

[0002] Metal spray forming technology is a process between casting metallurgy (IM) and powder metallurgy (PM), and the spray deposition process is fast, fine-grained, low in gas content, and free of macrosegregation, and the deposited embryo has excellent mechanical properties.

[0003] Metal spray forming technology includes three stages of smelting, atomization and deposition; the working principle of the metal spray forming technology is that the metal melt is atomized into fine dispersed metal droplet particles in a closed spray chamber under the action of high-pressure inert gas, and the metal droplet particles are sprayed to the deposition disc at a high speed under the action of high-speed gas. However, most of the atomized metal droplets reach the end face of the deposition body in a semi-solid state and do not have the ability to diffuse. The coating range of the initial deposition surface determines the final size of the product.

[0004] The existing metal spray forming technology mostly uses a fixed single nozzle, and the nozzle position of the fixed single nozzle is fixed and immovable, and then a single jet is sprayed to the deposition disc; the existing metal spray forming technology has limitations in the size of the product, and due to the difference in atomization level between the center and the edge, the density of the surface layer and the core is inconsistent; the density of the surface layer and the core is more obvious on the deposition body of large diameter specifications. SUMMARY

[0005] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide an atomizing device for increasing the diameter of a spray forming deposition body and reducing porosity.

[0006] The atomizing device for increasing the diameter of a spray forming deposition body and reducing porosity comprises a multi-nozzle pouring mechanism, a swing atomizing mechanism and a rotary lifting deposition disc; the rotary lifting deposition disc is arranged within the spraying distance and spraying area range of the multi-nozzle pouring mechanism; the swing atomizing mechanism is used to adjust the swing amplitude of the atomizing nozzles in the multi-nozzle pouring mechanism, and the spraying angle and number of the atomizing nozzles are matched with the molding of the sand in the tundish and the position of the pouring gate;

[0007] The multi-nozzle pouring mechanism comprises a tundish, an atomizing nozzle, a tundish support, fixing holes, gas nozzle flat shafts, rotating bearings and gas passages; the tundish is fixed on the tundish support through the fixing holes; the tundish bottom is provided with multiple pouring gates; the gas nozzle flat shafts are provided with liquid inlets on the upper side walls, the pouring gates of the tundish bottom are located directly above the liquid inlets and are in communication with the liquid inlets; the atomizing nozzles are arranged on the lower side walls of the gas nozzle flat shafts and are in sealed connection with the liquid inlets; the atomizing nozzles are further provided with annular gas outlets between the nozzle centers and the outer walls of the atomizing nozzles; the multiple gas passages are in sealed fixed connection with the internal passages of the corresponding gas nozzle flat shafts, and the internal passages are in communication with the gas outlets; the rotating bearings are sleeved on the two ends of each gas nozzle flat shaft, and the rotating bearings are fixed on the outer side walls of the tundish support.

[0008] The swing type atomizing mechanism comprises a rotating servo motor and a crank rocker mechanism; the rotating servo motor is connected to the driving end of the crank rocker mechanism, and the multiple driven ends of the crank rocker mechanism are connected to the gas nozzle flat shafts through the multiple rotating bearings away from the gas passage sides; the crank rocker mechanism is used to drive the gas nozzle flat shafts to swing reciprocally within a certain angle, so that the atomizing nozzles on the gas nozzle flat shafts are located at different spraying positions and angles.

[0009] The rotating lifting type deposition disc comprises a deposition disc and a rotating lifting mechanism, and the deposition disc is fixed on the rotating lifting mechanism; the rotating lifting mechanism comprises rotating devices and lifting devices.

[0010] As preferred, the crank rocker mechanism comprises a crank, a connecting rod, a rocker and a frame; the rotating servo motor and the gas nozzle flat shaft on which the atomizing gas nozzle is arranged are connected through the frame; one end of the crank is a fixed end, and the other end is a non-fixed end; both ends of the connecting rod are non-fixed ends; one end of the rocker is a fixed end, and the other end is a non-fixed end; the fixed end of the crank is fixed on the rotating center point of the rotating servo motor, the non-fixed end of the crank is movably connected to one non-fixed end of the connecting rod, the other non-fixed end of the connecting rod is movably connected to the non-fixed end of the rocker; and the fixed end of the rocker is fixed on the swing center point of the gas nozzle flat shaft.

[0011] As preferred, the non-fixed end of the crank is movably connected to one non-fixed end of the connecting rod through a hinge, and the other non-fixed end of the connecting rod is movably connected to the non-fixed end of the rocker through a hinge.

[0012] As preferred, each nozzle center of the atomizing nozzle is used to spray the molten metal, and the spraying angle is adjustable.

[0013] As preferred, the spraying distance of the atomizing nozzle and the surface area of the deposition disc are covered.

[0014] As preferred, the tundish and all the pouring gates are arranged at fixed positions, which can effectively avoid the splashing of the molten steel and the leakage of the molten steel.

[0015] The rotating device at the bottom of the deposition disc and the lifting and rotating speed of the lifting device are adjustable, so that deposition bodies of different specifications can be produced.

[0016] The number and caliber of the pouring gates are adjustable, so that the flow of the molten metal can be adjusted.

[0017] The atomized jet sprayed by the multi-nozzle pouring mechanism is deposited on the deposition disc, so that a deposition blank with a cross-sectional area of 500,000 square millimeters is obtained, and the surface layer core structure of the obtained deposition blank is uniform.

[0018] The present application has the following advantages:

[0019] The atomizing device adopted by the present application comprises a swing-type atomizing mechanism, a crank rocker mechanism in the swing-type atomizing mechanism, and a flat shaft of a gas nozzle reciprocally swinging within a certain angle, so as to adjust the spray angle and swing amplitude of the atomizing nozzle.

[0020] The present application can adjust the number of nozzles (spray channels), match the self-rotating speed and lifting speed of the deposition disc, spray or deposit in a displacement mode, increase the surface spray coating area of the deposition body, spray a deposition body with a larger diameter specification, and reduce the porosity of the molten metal layer sprayed on the deposition disc, so as to meet the production requirements of deposition ingots of different diameters.

[0021] The number of pouring gates on the tundish can be adjusted, multiple pouring gates are arranged side by side at the bottom of the tundish, the diameter of the product that can be produced is further increased, the position of the tundish and the pouring gate is fixed, so that the splashing of molten steel and the leakage of molten steel can be effectively avoided, the rotating and lifting mechanism of the deposition disc, the lifting and rotating speed of the rotating device at the bottom of the deposition disc and the lifting device are adjustable, the spray angle and number of the atomizing nozzle are matched with the sand molding of the tundish and the position of the pouring gate, and the surface layer core structure of the obtained deposition body is uniform. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the atomizing device of the present application;

[0023] Figure 2 It is a schematic diagram of the atomizing nozzle of the present application;

[0024] Figure 3 It is a working principle diagram of the crank rocker mechanism of the present application;

[0025] Figure 4 It is a structure diagram of the swing-type atomizing mechanism of the present application.

[0026] Explanation of reference signs: tundish 1, pouring nozzle 2, atomizing nozzle 3, spray deposited ingot 4, deposition disc 5, swing amplitude 6, gas flow outlet 7, liquid metal 8, liquid metal film 9, strip-shaped droplet 10, oval-shaped droplet 11, spherical droplet 12, rotating servo motor 13, crank rocker mechanism 14, gas nozzle flat shaft 15, rotating bearing 16, gas passage 17, crank 18, connecting rod 19, rocker 20, frame 21, tundish support 22, fixing hole 23. DETAILED DESCRIPTION

[0027] The application will be further described below in conjunction with examples. The following examples are only used to help understand the application. It should be pointed out that for ordinary people in the technical field, several modifications can be made to the application without departing from the principles of the application, and these improvements and modifications also fall within the protection scope of the claims of the application.

[0028] As an example, as shown in Figure 1 The atomizing device for increasing the diameter of spray formed deposition body and reducing porosity includes a multi-nozzle pouring mechanism, a swing atomizing mechanism and a rotating lifting deposition disc. The rotating lifting deposition disc is arranged within the spraying distance and spraying area of the multi-nozzle pouring mechanism. The swing atomizing mechanism is used to adjust the swing amplitude 6 of the atomizing nozzle 3 in the multi-nozzle pouring mechanism. The spray angle and number of the atomizing nozzle are matched with the sand molding of the tundish and the position of the pouring nozzle.

[0029] The multi-nozzle pouring mechanism includes a tundish 1, an atomizing nozzle 3, a tundish support 22, a fixing hole 23, a gas nozzle flat shaft 15, a rotating bearing 16 and a gas passage 17. The tundish 1 is sealingly fixed to the tundish support 22 through a plurality of fixing holes 23. A plurality of pouring nozzles 2 are arranged side by side at the bottom of the tundish 1, which can further increase the diameter of the producible product. The tundish 1 and all the pouring nozzles 2 are arranged at fixed positions, which can effectively prevent the spatter of liquid steel and leakage of liquid steel. The upper side wall of the gas nozzle flat shaft 15 is provided with a liquid inlet, and the pouring nozzle 2 at the bottom of the tundish 1 is directly above the liquid inlet and is in communication with the liquid inlet. The atomizing nozzle 3 is arranged at the lower side wall of the gas nozzle flat shaft 15 and is sealingly connected with the liquid inlet. A ring-shaped gas flow outlet 7 is further arranged between the center of the nozzle and the outer wall of the atomizing nozzle 3. The nozzle is used to spray the liquid metal 8. The spray angle of the nozzle, the number and caliber of the pouring nozzles 2 can be adjusted to adjust the flow of the liquid metal 8. A plurality of gas passages 17 are sealingly and fixedly connected with the internal passages of the corresponding gas nozzle flat shafts 15. The internal passages are in communication with the gas flow outlet 7. The rotating bearing 16 is sleeved at both ends of each gas nozzle flat shaft 15, and the rotating bearing 16 is fixed to the outer side wall of the tundish support 22.

[0030] As shown in Figure 4As shown, the oscillating atomizing mechanism includes a rotary servo motor 13 and a crank-rocker mechanism 14; the rotary servo motor 13 is connected to the active end of the crank-rocker mechanism 14, and the multiple driven ends of the crank-rocker mechanism 14 are respectively connected to the flat shaft of the air nozzle 15 through multiple rotating bearings 16 away from the side of the gas channel 17.

[0031] like Figure 3 As shown, the crank-rocker mechanism 14 includes a crank 18, a connecting rod 19, a rocker arm 20, and a frame 21; the rotary servo motor 13 and the gas nozzle flat shaft 15 where the atomizing gas nozzle is located are connected through the frame 21; one end of the crank 18 is a fixed end, and the other end is a non-fixed end; both ends of the connecting rod 19 are non-fixed ends; one end of the rocker arm 20 is a fixed end, and the other end is a non-fixed end; the fixed end of the crank 18 is fixed to the rotation center point of the rotary servo motor 13, the non-fixed end of the crank 18 is movably connected to one non-fixed end of the connecting rod 19, and the other non-fixed end of the connecting rod 19 is movably connected to the non-fixed end of the rocker arm 20; the fixed end of the rocker arm 20 is fixed to the swing center point of the gas nozzle flat shaft 15;

[0032] The rotary lifting deposition plate includes a deposition plate 5 and a rotary lifting mechanism. The deposition plate 5 is fixed on the rotary lifting mechanism. The rotary lifting mechanism includes a rotating device and a lifting device. The spray distance of the atomizing nozzle 3 and the surface area covered by the deposition plate 5 are adjustable. The lifting and rotation speed of the rotating device and the lifting device at the bottom of the deposition plate 5 are adjustable. The initial height of the rotary lifting deposition plate 5 can be adjusted within the process range and, together with the incident angle of the tundish pouring nozzle and the swing angle of the atomizing nozzle 3, determines the deposition point position. The lifting speed of the rotary lifting deposition plate 5 is consistent with the growth rate of the deposition ingot (monitored by a scale during production), which can keep the deposition point position from shifting.

[0033] When the above-mentioned atomizing device is working:

[0034] Let the crank be 18 ( Figure 3 (AB1 and AB2), connecting rod 19 ( Figure 3 (B1C1 and B2C2), Joystick 20 ( Figure 3 (DC1 and DC2), rack 21 ( Figure 3 The frame lengths of (AD) are a, b, c, and d, respectively; where A is the rotation center point of the transmission device (rotary servo motor), and D is the swing center point of the driven device (the flat shaft of the gas nozzle where the atomizing gas nozzle is located); B1C1 and B2C2 are the swing limit positions.

[0035] The length of the frame 21 is determined by the installation position of the equipment on site, and the length remains unchanged after it is fixed; the rocker arm 20 is connected to the flat shaft 15 of the air nozzle as a driven mechanism, so that it swings back and forth; the swing amplitude 6 of the atomizing nozzle 3 is adjusted by the swinging atomizing mechanism, and the spray angle of the nozzle is adjusted.

[0036] When the length of the rocker 20 and the rack 21 is determined, the length of the connecting rod 19 and the crank 18 determines the swing upper and lower limit angle ∠α and ∠β, and the swing angle ∠γ. The incidence angle of the tundish pouring nozzle is α+1 / 2γ, and according to the cosine theorem, it can be obtained:

[0037] (a+b)²=c²+d²-2cdcosβ;

[0038] (b-a)²=c²+d²-2cdcosα;

[0039] According to the required swing angle value, the length of the crank 18 and the connecting rod 19 is calculated;

[0040] The swing frequency of the rocker 20 is consistent with the rotation frequency of the crank 18;

[0041] According to the length of the crank 18, the length of the connecting rod 19 and the rotation frequency of the rotary servo motor 13, the swing amplitude and frequency of the atomizing nozzle 3 are controlled, so as to accurately control the coating range; the swing amplitude of the atomizing nozzle should not be too large, which is easy to cause the difference in density of the coating edge;

[0042] As shown in Figure 2 The metal liquid 8 in the tundish 1 is sprayed out through the nozzle of the atomizing nozzle 3 to form a metal liquid film 9, and an annular gas outlet 7 is further arranged between the center nozzle of the atomizing nozzle and the outer wall of the atomizing nozzle 3. The gas outlet 7 is used for spraying gas, and the sprayed gas wraps the metal liquid film 9 to scatter the metal liquid film 9 to form strip-shaped liquid drops 10, elliptical liquid drops 11 and spherical liquid drops 12, etc. With the increase of the flight distance, most of the liquid drops are finally converted into spherical liquid drops 12. The reasonable position and distance between the atomizing nozzle 3 and the rotary lifting tray make the atomized liquid drops just deposit on the upper surface of the deposition tray 5 and the subsequent generated spray deposition ingot 4, so as to produce impact, bonding and solidification, so as to obtain a cylindrical deposition body with consistent appearance diameter and uniform surface and core structure;

[0043] Through the test of the double-nozzle swing type spray atomizing device, the data shows that the present set of equipment can produce a spray deposition blank product with a diameter of 800 and a height of 2000, the condensation rate of the spray deposition blank is >10 4 K / s, the deposition speed is >100 kg / min, the structure is fine (the average grain size is 0.9-20 μm), the density is >98%, the layer defects are few, and the material yield is >85%.

Claims

1. An atomizing device for increasing the diameter and reducing the porosity of a spray formed deposit, characterized by, The application relates to a multi-nozzle pouring mechanism, a swing type atomizing mechanism and a rotary lifting type deposition disc. The rotary lifting type deposition disc is arranged in the spraying distance and spraying area range of the multi-nozzle pouring mechanism; the swing type atomizing mechanism is used for adjusting the swing amplitude (6) of the atomizing nozzle (3) in the multi-nozzle pouring mechanism. The multi-nozzle pouring mechanism comprises a tundish (1), an atomizing nozzle (3), a tundish support (22), a fixing hole (23), a gas nozzle flat shaft (15), a rotating bearing (16) and a gas channel (17); the tundish (1) is sealingly fixed on the tundish support (22) through a plurality of fixing holes (23); the bottom of the tundish (1) is provided with a plurality of pouring gates (2); the upper side wall of the gas nozzle flat shaft (15) is provided with a liquid inlet, and the pouring gate (2) at the bottom of the tundish (1) is located directly above the liquid inlet and is in communication with the liquid inlet; the atomizing nozzle (3) is arranged on the lower side wall of the gas nozzle flat shaft (15) and is sealingly connected with the liquid inlet; a ring-shaped gas flow outlet (7) is further arranged between the nozzle at the center of the atomizing nozzle (3) and the outer wall of the atomizing nozzle (3); a plurality of gas channels (17) are sealingly and fixedly connected with the internal channels of the corresponding gas nozzle flat shafts (15), and the internal channels are communicated with the gas flow outlet (7); the two ends of each gas nozzle flat shaft (15) are sleeved with the rotating bearings (16), and the rotating bearings (16) are fixed on the outer side wall of the tundish support (22); The swing type atomizing mechanism comprises a rotary servo motor (13) and a crank rocker mechanism (14); the crank rocker mechanism (14) comprises a crank (18), a connecting rod (19), a rocker (20) and a rack (21); the rotary servo motor (13) and the gas nozzle flat shaft (15) where the atomizing gas nozzle is located are connected through the rack (21); one end of the crank (18) is a fixed end, and the other end is a non-fixed end; the two ends of the connecting rod (19) are non-fixed ends; one end of the rocker (20) is a fixed end, and the other end is a non-fixed end; the fixed end of the crank (18) is fixed on the rotating center point of the rotary servo motor (13), the non-fixed end of the crank (18) is movably connected with one non-fixed end of the connecting rod (19), and the other non-fixed end of the connecting rod (19) is movably connected with the non-fixed end of the rocker (20); the fixed end of the rocker (20) is fixed on the swing center point of the gas nozzle flat shaft (15); The rotary servo motor (13) is connected with the driving end of the crank rocker mechanism (14), and the multiple driven ends of the crank rocker mechanism (14) are connected with the gas nozzle flat shaft (15) through the multiple rotating bearings (16) away from the gas channel (17) side; the crank rocker mechanism (14) is used for driving the gas nozzle flat shaft (15) to reciprocatingly swing within a certain angle, so that the atomizing nozzle (3) on the gas nozzle flat shaft (15) is located at different spraying positions and spraying angles; the swing type atomizing mechanism can control the swing amplitude and frequency of the atomizing nozzle (3) through the crank rocker mechanism (14). ​ The rotary lifting deposition disc comprises a deposition disc (5) and a rotary lifting mechanism, the deposition disc (5) is fixed on the rotary lifting mechanism, the rotary lifting mechanism comprises rotating devices and lifting devices.

2. The atomizing device for increasing the diameter and decreasing the porosity of a spray formed deposit according to claim 1, wherein: The non-fixed end of the crank (18) is movably connected with one non-fixed end of the connecting rod (19) through a hinge, and the other non-fixed end of the connecting rod (19) is movably connected with the non-fixed end of the rocker (20) through a hinge.

3. The atomizing device for increasing the diameter and decreasing the porosity of a spray formed deposit according to claim 1, wherein: The jet angle and swing range of each atomizing nozzle (3) can be adjusted.

4. The atomizing device for increasing the diameter and decreasing the porosity of a spray formed deposit according to claim 1, wherein: The spraying distance of the atomizing nozzle (3) and the surface area of the deposition disc (5) covered.

5. The atomizing device for increasing the diameter and decreasing the porosity of a spray formed deposit according to claim 1, wherein: The tundish (1) and all the pouring gates (2) are arranged at fixed positions.

6. The atomizing device for increasing the diameter and decreasing the porosity of a spray formed deposit according to claim 1, wherein: The lifting and rotating speed of the rotating devices and the lifting devices at the bottom of the deposition disc (5) can be adjusted.

7. The atomizing device for increasing the diameter and decreasing the porosity of a spray formed deposit according to claim 1, wherein: The number and caliber of the pouring gates (2) can be adjusted to adjust the flow of the metal liquid.

8. The atomizing device for increasing the diameter and decreasing the porosity of a spray formed deposit according to claim 1, wherein: The atomized jet sprayed by the multi-nozzle pouring mechanism is deposited on the deposition disc (5), and a deposition blank with a sectional area of 500000 square millimeters is obtained.

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