A device for enhancing the atomization effect of a centrifugal carousel and a method of use

Abstract

The application relates to the field of additive manufacturing technology, in particular to a device for enhancing the atomization effect of a centrifugal disc and a use method thereof. The device for enhancing the atomization effect of the centrifugal disc comprises a centrifugal disc, a guiding mechanism and a driving device. The guiding mechanism surrounds the centrifugal disc, and an annular air outlet is formed between the upper part of the guiding mechanism and the peripheral surface of the centrifugal disc. The guiding mechanism is used for guiding the gas jet generated by the lower surface and the peripheral surface of the centrifugal disc to be sprayed upwards from the annular air outlet during rotation, so as to impact the melt liquid film extending outwards from the edge of the upper surface of the centrifugal disc. The device can enhance the disturbance of the melt liquid film without increasing the consumption of inert gas, thereby strengthening the atomization effect of the centrifugal disc on the metal melt and improving the fine powder yield.

Description

Technical Field

[0001] This application relates to the field of additive manufacturing technology, and more specifically, to a device and method for enhancing the atomization effect of a centrifugal turntable. Background Technology

[0002] In an inert gas protected environment, when producing additive manufacturing metal powder raw materials using a rotary centrifugal atomization process, the centrifugal disc rotates at high speed, with the edge linear velocity exceeding 100 m / s. Consequently, the upper and lower surfaces of the centrifugal disc, as well as other high-speed rotating surfaces, entrain surrounding inert gas, generating a gas jet. This gas jet disturbs the molten metal film at the edge of the centrifugal disc, enhancing the atomization effect of the molten metal. However, without controlling and guiding the gas jet, its disturbance effect on the molten metal surface of the centrifugal disc is very limited. Therefore, it is necessary to research a device to enhance the atomization effect of the centrifugal disc. By controlling and guiding the gas jet, the disturbance of the molten metal film can be enhanced without increasing the consumption of inert gas, thereby strengthening the atomization effect of the centrifugal disc on the molten metal and improving the yield of fine powder.

[0003] There is currently no effective technical solution to the above problems. Summary of the Invention

[0004] The purpose of this application is to provide a device and method for enhancing the atomization effect of a centrifugal disc. By controlling and guiding the gas jet, the disturbance of the molten liquid film can be enhanced without increasing the consumption of inert gas, thereby strengthening the atomization effect of the centrifugal disc on the molten metal and improving the yield of fine powder.

[0005] This application provides a device for enhancing the atomization effect of a centrifugal disc, including a centrifugal disc, a guiding mechanism, and a driving device;

[0006] Both the centrifugal turntable and the guiding mechanism are rotating structures.

[0007] The centrifugal turntable includes an upper surface, a lower surface, and a circumferential surface;

[0008] The centrifugal turntable is connected to the drive device via a transmission shaft, and the drive device is used to drive the centrifugal turntable to rotate.

[0009] The guiding mechanism surrounds the centrifugal turntable, and the upper part of the guiding mechanism and the circumference of the centrifugal turntable form an annular air outlet that runs vertically through the turntable. The guiding mechanism is used to guide the gas jet generated by the lower surface and the circumference of the centrifugal turntable during rotation to be ejected upward from the annular air outlet.

[0010] This application, through the above-mentioned configuration, causes a gas jet to be ejected from the annular air outlet to impact the molten liquid film extending outward from the edge of the upper surface of the centrifugal turntable, thereby causing disturbance to the molten liquid film, which can enhance the atomization effect of the centrifugal turntable on the molten metal and improve the yield of fine powder.

[0011] Optionally, the top of the guide mechanism is lower than the upper surface of the centrifugal turntable.

[0012] The above settings ensure that the gas jet generated on the lower and circumferential surfaces of the centrifugal turntable during rotation is undisturbed, while simultaneously preventing the top of the guide mechanism from directly interfering with the molten liquid film extending circumferentially to the upper surface of the centrifugal turntable under centrifugal force.

[0013] Optionally, the height difference between the top of the guide mechanism and the upper surface of the centrifugal turntable is 0.1mm-1mm, and the width of the annular air outlet is 0.1mm-2mm.

[0014] Optionally, the generatrix of the rotating body at the upper part of the guide mechanism is an inclined straight line. From bottom to top, the distance between the generatrix of the rotating body and the central axis of the centrifugal turntable gradually decreases, and the generatrix of the rotating body and the lower surface of the centrifugal turntable have a second included angle.

[0015] By setting the generatrix of the rotating body at the top of the guide mechanism to an inclined straight line, the gas jet generated by the lower surface and circumference of the centrifugal turntable during rotation is guided through the top of the guide mechanism to the annular air outlet, thereby impacting the melt film above and disturbing the melt film to improve the atomization effect.

[0016] Optionally, the range of the second included angle is 60°-90°.

[0017] Optionally, the generatrix of the rotating body at the top of the guide mechanism is a curve. From bottom to top, the distance between the generatrix of the rotating body and the central axis of the centrifugal turntable gradually increases and then gradually decreases. There is a third included angle between the characteristic tangent of the generatrix of the rotating body and the lower surface of the centrifugal turntable. The range of the third included angle is 90°-180°. The characteristic tangent is the tangent line that passes through the intersection of the plane containing the generatrix of the rotating body and the lower surface of the centrifugal turntable.

[0018] Optionally, the lower surface of the centrifugal disc is an inclined surface, and the height of the circumference is 2mm-3mm.

[0019] Optionally, the upper part of the guide mechanism is cylindrical.

[0020] Optionally, the lower part of the guide mechanism is provided with a lower cover, which forms a cavity with the lower surface of the centrifugal turntable. The cavity is connected to the annular air outlet. The lower cover is provided with an inlet connected to the cavity, which is used to fill the cavity with inert gas.

[0021] Secondly, this application provides a method of using a device for enhancing the atomization effect of a centrifugal disc. Based on the aforementioned device for enhancing the atomization effect of a centrifugal disc, the method of use includes:

[0022] S1. When the centrifugal turntable rotates, the inert gas is introduced into the cavity, and the average velocity of the gas jet ejected from the annular air outlet is not greater than 25% of the edge linear velocity of the centrifugal turntable.

[0023] Beneficial effects: This application provides a device and method for enhancing the atomization effect of a centrifugal turntable. By setting a guiding mechanism, the guiding mechanism surrounds the centrifugal turntable and guides the gas jet generated by the rotation of the lower surface and circumference of the centrifugal turntable, which is then sprayed upward from the annular air outlet to impact the molten liquid film extending outward from the edge of the upper surface of the centrifugal turntable. This can enhance the disturbance of the molten liquid film without increasing the consumption of inert gas, thereby strengthening the atomization effect of the centrifugal turntable on the molten metal and improving the yield of fine powder. Attached Figure Description

[0024] Figure 1 A schematic diagram of the overall structure of the device for enhancing the atomization effect of a centrifugal disc provided in this application.

[0025] Figure 2 A schematic diagram of the first structure of the guiding mechanism provided in this application.

[0026] Figure 3 A second structural diagram of the guiding mechanism provided in this application.

[0027] Figure 4 A third structural diagram of the guiding mechanism provided for this application.

[0028] Figure 5 This is a structural schematic diagram of the lower cover provided in this application.

[0029] Labeling explanations: 10. Centrifugal turntable; 101. Upper surface; 102. Lower surface; 103. Circumferential surface; 11. Guiding mechanism; 12. Drive device; 13. Transmission shaft; 14. Annular air outlet; 15. Lower cover; 16. Melt film; 17. Gas trajectory. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] In a first aspect, this application provides a device for enhancing the atomization effect of a centrifugal disc, including a centrifugal disc 10, a guiding mechanism 11, and a driving device 12;

[0033] Both the centrifugal turntable 10 and the guide mechanism 11 are rotating structures;

[0034] The centrifugal turntable 10 includes an upper surface 101, a lower surface 102, and a circumferential surface 103;

[0035] The centrifugal turntable 10 is connected to the drive device 12 via the drive shaft 13, and the drive device 12 is used to drive the centrifugal turntable 10 to rotate.

[0036] The guiding mechanism 11 surrounds the centrifugal turntable 10, and the upper part of the guiding mechanism 11 and the circumferential surface 103 of the centrifugal turntable 10 form an annular air outlet 14 that runs vertically through the centrifugal turntable 10. The guiding mechanism 11 is used to guide the gas jet generated by the lower surface 102 and the circumferential surface 103 of the centrifugal turntable 10 during rotation to be sprayed upward from the annular air outlet 14.

[0037] Specifically, in the rotary centrifugal atomization process, the centrifugal disc 10 rotates at high speed, with the edge linear velocity exceeding 100 m / s. Consequently, the upper and lower surfaces of the centrifugal disc 10, as well as other high-speed rotating surfaces, entrain surrounding inert gas, generating a gas jet. This gas jet disturbs the molten metal film 16 at the edge of the centrifugal disc 10, improving the atomization effect of the molten metal. However, without control and guidance, the disturbance effect of the gas jet on the molten metal surface of the centrifugal disc 10 is very limited. Therefore, this application addresses this by providing a guiding mechanism 11, such as... Figure 1As shown, the guide mechanism 11 guides the gas jet (i.e., the gas jet generated by the rotation of the lower surface 102 and the circumferential surface 103 of the centrifugal turntable 10) Figures 2-4 The gas flow (as shown in the gas trajectory 17) is guided and ejected upward from the annular outlet 14 to impact the molten liquid film 16 extending outward from the edge of the upper surface 101 of the centrifugal turntable 10. This can enhance the disturbance of the molten liquid film 16 without increasing the consumption of inert gas, thereby strengthening the atomization effect of the centrifugal turntable 10 on the molten metal and improving the yield of fine powder.

[0038] The drive device 12 can be a motor, and no specific limitation is made here; the present application Figures 1-4 The schematic diagrams of the guide mechanism 11 shown all use the generatrix of the rotating body at the top of the guide mechanism 11 as a reference. Figure 5 The schematic diagram of the guide mechanism 11 shown uses the generatrix of the upper rotating body and the generatrix of the lower body (i.e., the lower cover 15) of the guide mechanism 11 as illustrations. The overall structure of the guide mechanism 11 in this application may consist only of the upper part of the guide mechanism 11, for example... Figures 1-4 The illustrated embodiment may also include an upper and a lower portion of the guide mechanism 11, for example... Figure 5 The implementation shown; whether the overall structure of the guide mechanism 11 includes a lower part can be set according to actual needs, and no specific restrictions are made here.

[0039] In some embodiments, the top of the guide mechanism 11 is lower than the upper surface 101 of the centrifugal turntable 10.

[0040] Specifically, in order to ensure the disturbance effect of the gas jet generated by the lower surface 102 and circumferential surface 103 of the centrifugal turntable 10 during rotation, and at the same time to prevent the top of the guide mechanism 11 from directly interfering with the molten liquid film 16 extending circumferentially to the upper surface 101 of the centrifugal turntable 10 under the action of centrifugal force, the top of the guide mechanism 11 is set to be lower than the upper surface 101 of the centrifugal turntable 10, so that the top of the guide mechanism 11 will not interfere with the molten liquid film 16.

[0041] In some embodiments, the height difference H between the top of the guide mechanism 11 and the upper surface 101 of the centrifugal turntable 10 is 0.1mm-1mm, and the width of the annular air outlet 14 is 0.1mm-2mm. For example... Figure 2 As shown, this design ensures both the disturbance effect of the gas jet and prevents the top of the guide mechanism 11 from directly interfering with the melt film 16. The gas jet ejected from the annular outlet 14 has a fourth included angle A with the upper surface 101 of the centrifugal turntable 10. The closer the fourth included angle A is to 90°, the better the disturbance effect of the gas jet on the melt film 16.

[0042] In some embodiments, the generatrix of the rotating body at the top of the guide mechanism 11 is an inclined straight line. From bottom to top, the distance between the generatrix of the rotating body and the central axis of the centrifugal turntable 10 gradually decreases. The upper surface 101 and the lower surface 102 of the centrifugal turntable 10 are parallel. The circumferential surface 103 of the centrifugal turntable 10 is perpendicular to the upper surface 101 and the lower surface 102. The generatrix of the rotating body and the lower surface 102 of the centrifugal turntable 10 have a second included angle C.

[0043] Specifically, such as Figure 2 As shown, by setting the generatrix of the rotating body at the top of the guide mechanism 11 to be an inclined straight line, the gas jet generated by the lower surface 102 and the circumferential surface 103 of the centrifugal turntable 10 during rotation is guided through the upper part of the guide mechanism 11 to the annular air outlet 14, thereby impacting the melt liquid film 16 above and disturbing the melt liquid film 16 to improve the atomization effect.

[0044] In some implementations, the second included angle C ranges from 60° to 90°.

[0045] Specifically, the second included angle C between the generatrix of the rotating body and the lower surface 102 of the centrifugal turntable 10 is between 60° and 90°, which can improve the efficiency of the gas jet flowing towards the annular outlet 14. The closer the second included angle C is to 90°, the higher the efficiency of the gas jet flowing towards the annular outlet 14 (the smaller the downward flow of gas jet). A baffle plate is provided at the lower part of the guiding mechanism 11. The baffle plate can be flat or curved. The baffle plate is used to prevent the gas jet from flowing downwards back. When the second included angle C is 90°, it can reduce the downward flow of gas jet.

[0046] In some embodiments, the generatrix of the rotating body at the top of the guide mechanism 11 is a curve. From bottom to top, the distance between the generatrix of the rotating body and the central axis of the centrifugal turntable 10 gradually increases and then gradually decreases. There is a third included angle D between the characteristic tangent of the generatrix of the rotating body and the lower surface 102 of the centrifugal turntable 10. The range of the third included angle D is 90°-180°. The characteristic tangent is the tangent line that passes through the intersection of the generatrix of the rotating body and the plane containing the lower surface 102 of the centrifugal turntable 10.

[0047] Specifically, by setting the generatrix of the rotating body at the top of the guide mechanism 11 to be a curve, the distance between the generatrix of the rotating body and the central axis of the centrifugal turntable 10 gradually increases and then gradually decreases from bottom to top, such as... Figure 3 As shown, the gas jet can be guided almost entirely by the guiding mechanism 11 to the annular air outlet 14. Preferably, the closer the third included angle D is to 180°, the higher the efficiency of guiding the gas jet to the annular air outlet 14.

[0048] In some embodiments, the lower surface 102 of the centrifugal turntable 10 is an inclined surface, and the height of the circumferential surface 103 is 2mm-3mm.

[0049] Specifically, to better utilize the gas jet, this application sets the lower surface 102 of the centrifugal disc 10 as an inclined surface (facing the annular air outlet 14, the thickness of the centrifugal disc 10 gradually decreases), such as Figure 4 As shown, this reduces the likelihood of the gas jet being guided downwards by the guiding mechanism 11. Specifically, when the lower surface 102 of the centrifugal turntable 10 is inclined, setting the height of the circumferential surface 103 of the centrifugal turntable 10 to 2mm-3mm reduces the mass of the disc near the edge of the centrifugal turntable 10, thereby reducing centrifugal stress.

[0050] In some embodiments, the upper part of the guide mechanism 11 is cylindrical. For example... Figure 4 As shown, when the generatrix of the rotating body at the top of the guide mechanism 11 is a vertical line, the shape of the guide mechanism 11 is cylindrical. At this time, setting the lower surface 102 of the corresponding centrifugal turntable 10 as an inclined surface can reduce the probability of the gas jet being guided downward by the guide mechanism 11.

[0051] In some embodiments, a lower cover 15 is provided at the lower part of the guide mechanism 11. The lower cover 15 and the lower surface 102 of the centrifugal turntable 10 enclose a cavity, which communicates with the annular air outlet 14. The lower cover 15 is provided with an inlet communicating with the cavity, which is used to fill the cavity with inert gas. Preferably, this inlet is an annular inlet coaxial with the drive shaft 13, such as... Figure 5 As shown, this ensures uniform airflow.

[0052] Specifically, such as Figure 5 As shown, by setting a lower cover 15 at the bottom of the guide mechanism 11, when the rotary centrifugal atomization process is used to atomize molten iron-based, copper-based, nickel-based, and other metals, in order to protect the high-speed rotating drive device 12, it is necessary to lower the temperature of the molten metal (located in...) Figure 5 The heat transferred from the centrifugal turntable 10 to the drive device 12 (hereinafter referred to as the high-speed motor) is introduced from the inlet with room temperature inert gas. On the one hand, this can reduce the temperature of the drive shaft 13, thereby reducing the heat transferred from the high-temperature molten metal to the high-speed motor through the centrifugal turntable 10 and the drive shaft 13, which is beneficial to protecting the high-speed motor. At the same time, the gas in the cavity will be heated, so that the gas jet ejected from the annular air outlet 14 will not cause an excessive temperature drop to the molten liquid film 16 (an excessive temperature drop will result in poor centrifugal atomization effect of the molten liquid film 16). On the other hand, by supplementing inert gas to actively control the flow rate and speed of the gas jet ejected from the annular air outlet 14, the disturbance of the molten liquid film 16 can be better enhanced, the atomization effect of the centrifugal turntable 10 can be better improved, thereby improving the fine powder yield. The lower cover 15 can be a groove shape or a flat plate, and the specific shape is not limited.

[0053] Secondly, this application provides a method of using a device for enhancing the atomization effect of a centrifugal disc. The method of using the aforementioned device for enhancing the atomization effect of a centrifugal disc includes:

[0054] S1. When the centrifugal turntable 10 rotates, inert gas is introduced into the cavity, and the average velocity of the gas jet ejected from the annular outlet 14 is not greater than 25% of the edge linear velocity of the centrifugal turntable 10.

[0055] Specifically, if the velocity of the gas jet ejected from the annular outlet 14 is too high, when the airflow velocity reaches 200 m / s or more, the airflow will directly atomize the melt liquid film 16, and gas atomization powder production will account for a large proportion, resulting in many satellite powders and hollow powders. Therefore, in order to prevent the airflow from directly atomizing the melt liquid film 16 and reducing the quality of the powder produced by centrifugal atomization, the flow rate of the inert gas is limited, thereby controlling the average flow rate of the gas jet ejected from the annular outlet 14 to not exceed 25% of the edge linear velocity of the centrifugal turntable 10.

[0056] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0057] The above are merely embodiments of this application and are not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A device for enhancing the atomization effect of a centrifugal turntable, characterized in that, The centrifugal rotating disc (10), the guide mechanism (11) and the driving device (12); Both the centrifugal rotating disc (10) and the guide mechanism (11) are of a rotary body structure. The centrifugal rotating disc (10) comprises an upper surface (101), a lower surface (102) and a peripheral surface (103). The centrifugal rotating disc (10) is connected with the driving device (12) through a transmission shaft (13), and the driving device (12) is used for driving the centrifugal rotating disc (10) to rotate. The guide mechanism (11) surrounds the centrifugal rotating disc (10), and an upper portion of the guide mechanism (11) and the peripheral surface (103) of the centrifugal rotating disc (10) form an annular air outlet (14) penetrating from top to bottom. The guide mechanism (11) is used for guiding the gas jet generated by the lower surface (102) and the peripheral surface (103) of the centrifugal rotating disc (10) to be sprayed upward from the annular air outlet (14) when the centrifugal rotating disc (10) rotates. A rotary body generatrix of the upper portion of the guide mechanism (11) is an inclined straight line. From bottom to top, the distance between the rotary body generatrix and the central axis of the centrifugal rotating disc (10) gradually decreases. The rotary body generatrix and the lower surface (102) of the centrifugal rotating disc (10) have a second included angle, and the second included angle ranges from 60° to 90°. Alternatively, the rotary body generatrix of the upper portion of the guide mechanism (11) is a curve. From bottom to top, the distance between the rotary body generatrix and the central axis of the centrifugal rotating disc (10) first gradually increases and then gradually decreases. The characteristic tangent of the rotary body generatrix and the lower surface (102) of the centrifugal rotating disc (10) have a third included angle, and the third included angle ranges from 90° to 180°. The characteristic tangent refers to a tangent passing through the intersection point of the rotary body generatrix and the plane on which the lower surface (102) of the centrifugal rotating disc (10) is located.

2. The apparatus of claim 1, wherein, The top end of the guide mechanism (11) is lower than the upper surface (101) of the centrifugal rotating disc (10).

3. The apparatus of claim 2, wherein, The height difference between the top end of the guide mechanism (11) and the upper surface (101) of the centrifugal rotating disc (10) ranges from 0.1 mm to 1 mm, and the width of the annular air outlet (14) ranges from 0.1 mm to 2 mm.

4. The apparatus of claim 1, wherein, The lower surface (102) of the centrifugal rotating disc (10) is an inclined surface, and the height of the peripheral surface (103) ranges from 2 mm to 3 mm.

5. The apparatus of claim 1, wherein, The lower portion of the guide mechanism (11) is provided with a lower cover body (15). The lower cover body (15) and the lower surface (102) of the centrifugal rotating disc (10) form a cavity. The cavity is in communication with the annular air outlet (14). The lower cover body (15) is provided with an inlet in communication with the cavity. The inlet is used for filling the cavity with inert gas.

6. A method of using a device to enhance the atomization effect of a centrifugal turntable, characterized in that, The device for enhancing the atomization effect of a centrifugal rotating disc based on claim 5, the use method comprises: S1. When the centrifugal rotating disc (10) rotates, the cavity is filled with inert gas, and the average flow velocity of the gas jet sprayed from the annular air outlet (14) is not greater than 25% of the peripheral linear velocity of the centrifugal rotating disc (10).

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