Centrifugal disc for centrifugal spray forming

Abstract

A centrifugal disc for centrifugal spray forming, a plurality of liquid throwing grooves are arranged on the disc surface of the centrifugal disc in the circumferential direction, the center line of the liquid throwing groove is a logarithmic spiral line with the center of the disc surface as the center; a molten liquid cylinder is arranged at the center of the disc surface, the cylinder wall of the molten liquid cylinder is provided with liquid outlet holes communicated with each liquid throwing groove; a piston rod is arranged in the molten liquid cylinder, the piston rod can slide up and down, and is used for closing or opening the liquid outlet holes, so that the metal melt in the molten liquid cylinder is thrown out from the liquid outlet holes in intervals and quantitatively, and then the droplets with nearly consistent diameters are obtained. In addition, the liquid throwing groove can throw the droplets along the radial direction of the centrifugal disc to impact the deposition layer in the positive direction, so that the problem of the reflected droplets impacting the deposition layer again is solved from the source. Compared with the oblique impact, the positive impact in the radial direction is not only beneficial to improve the density of the fusion of the droplets and the deposition layer and form fine grain structure, but also the droplets can be almost completely fused on the deposition layer, so that the effective deposition rate of the metal material is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of centrifugal jet forming technology, and in particular to a centrifugal disc for centrifugal jet forming. Background Technology

[0002] The principle of spray deposition is to break molten metal into fine droplets under the protection of an inert gas, and then continuously spray them onto a metal substrate under high pressure or centrifugal force, depositing a semi-solid deposition layer. The deposition layer solidifies into a preform through thermal conduction from the metal substrate. The preform is then hot-extruded or hot-forged to form a high-density metal ring. The advantage of spray deposition is that it can produce ring-shaped parts with minimal compositional segregation, fine and uniform microstructure, and relatively large dimensions.

[0003] The invention patent with authorization announcement number CN109877299B discloses a casting device and a casting centrifugal disc. The casting device in this patent uses the jet deposition principle to prepare hollow metal ingots. However, in application, it was found that the prepared hollow metal ingots are not ideal, mainly because the grain structure is not fine enough and the density is not high enough.

[0004] Analysis revealed that one reason for the insufficiently fine grain size and low density was the uneven diameter of the molten droplets ejected from the centrifuge disc. Droplets smaller than 1 mm in diameter had a short flight distance and low impact kinetic energy, insufficient to break up the internal dendrites upon impact. Droplets larger than 3 mm in diameter did not achieve the required cooling rate and dispersed after impacting the substrate. Only droplets within the 1-3 mm diameter range could break up the internal dendrites upon impact without dispersing. Subsequent improvements to the centrifuge disc structure and rotation speed were made, but the results were not ideal.

[0005] Reference Figure 1-2 Another reason for the insufficiently fine grain structure and low density is that the molten droplets 7 ejected from the centrifugal disc 1 do not impact the deposited layer 8 of the workpiece radially, but rather obliquely. According to the requirements of the spray forming process, the molten droplets 7 need to cool rapidly during ejection and reach a semi-solid state before impacting the deposited layer 8. Figure 2It can be seen that the semi-solidified molten droplets 7 are reflected when they impact the deposition layer 8. Only a portion of the molten droplets 7 fuse with the deposition layer 8, while the rest are reflected. If the reflected molten droplets 7 do not impact the deposition layer 8 again, it only results in material loss. However, most of the molten droplets 7, after being reflected by the centrifugal disk 1, will impact the deposition layer 8 again. Since the molten droplets have lost some kinetic energy and gradually solidified after multiple impacts, the impact on the deposition layer again results in poor fusion between the molten droplets and the deposition layer, a loose structure, and affects the density. Furthermore, the impact kinetic energy is greatly reduced, preventing the formation of fine grain structures. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention discloses a centrifugal disc for centrifugal jet forming, the purpose of which is:

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0008] A centrifugal disc for centrifugal jet forming has multiple sling grooves evenly distributed circumferentially on its surface. The center line of each sling groove is a logarithmic spiral line centered on the center of the disc. A molten metal cylinder is located at the center of the disc, and outlet holes communicating with each sling groove are provided on the cylinder wall. A piston rod is installed inside the molten metal cylinder, which can slide up and down to close or open the outlet holes, so that the molten metal in the molten metal cylinder is ejected from the outlet holes at intervals and in a quantitative manner to form molten droplets.

[0009] The following beneficial effects can be achieved by implementing the above technical solution:

[0010] 1. The rotating molten metal cylinder generates centrifugal force in the molten metal. By adjusting the frequency of the piston rod's up-and-down sliding motion, the quantity and volume of molten metal ejected from the outlet hole can be controlled, thus obtaining droplets with nearly uniform diameters. Droplets with similar diameters have similar impact kinetic energy and cooling rates, enabling the fabrication of jet-deposited parts with fine grains and high density.

[0011] 2. The centrifugal trough with a logarithmic spiral centerline allows molten droplets to be ejected radially from the centrifugal disc and impact the deposition layer. Because it is a radial head-on impact, the molten droplets fuse directly with the deposition layer after impact. A small amount of sputtering may occur, but no reflection will occur. This solves the problem of reflected molten droplets impacting the deposition layer again from the source.

[0012] 3. This radial frontal impact not only helps to improve the density of the fusion between the molten droplet and the deposited layer and form a fine grain structure, but also allows the molten droplet to be almost completely fused to the deposited layer, which greatly improves the effective deposition rate of the metal material.

[0013] Let the radius of the outlet hole be r, and the frequency of the piston rod's up-and-down movement be f, then we have:

[0014] r = K * Sr

[0015]

[0016] In the formula, R is the radius of the molten metal cylinder, ρ is the density of the molten metal, Sr is the radius of the molten droplet, ω is the rotational speed of the centrifugal disc, σ is the surface tension coefficient of the molten metal, and C≥1.

[0017] The beneficial effects of implementing the above technical solution are as follows: the above formula reveals the relationship between the radius of the liquid outlet, the frequency of the piston rod's up-and-down movement, and related parameters. Based on the desired spherical radius of the molten droplet, the radius of the liquid outlet and the frequency of the piston rod's up-and-down movement can be calculated in reverse, providing a theoretical basis for controlling the size of the molten droplet.

[0018] A further improvement to the technical solution is to install a liquid injection pipe inside the piston rod, which is used to inject molten metal into the molten metal cylinder.

[0019] The beneficial effect of implementing the above technical solution is that the injection pipe can replenish the molten metal into the molten metal cylinder, so that a certain amount of molten metal is always kept in the molten metal cylinder.

[0020] A further improved technical solution is provided: a transverse sliding groove is provided on the upper part of the piston rod, and an eccentric shaft is installed in the transverse sliding groove. The eccentric shaft is connected to a speed-regulating motor. When the speed-regulating motor rotates, the piston rod is driven to slide up and down through the cooperation of the eccentric shaft and the sliding groove.

[0021] The beneficial effect of implementing the above technical solution is that the piston rod slides up and down once for every revolution of the speed-regulating motor. By changing the speed of the speed-regulating motor, the frequency of the piston rod's up and down movement can be adjusted.

[0022] To further improve the technical solution, a ring of hot melt material is wrapped around the edge of the centrifugal disc. During operation, the centrifugal disc rotates, and the molten droplets are thrown off the centrifugal disc and hit the deposition layer and are reflected. The reflected molten droplets are captured by the hot melt material after hitting it.

[0023] The beneficial effects of implementing the above technical solution are as follows: Since molten metal droplets are highly heated liquid droplets, when they impact the molten material, they can instantly soften the material. At this point, the droplet will embed itself or penetrate into the molten material, losing its kinetic energy for re-reflection and thus preventing it from impacting the deposition layer again. This fundamentally solves the problem of reflected molten droplets re-impacting the deposition layer.

[0024] To further improve the technical solution, the hot melt material is any one of asphalt, plastic, or hot melt adhesive.

[0025] The beneficial effects of implementing the above technical solution are: asphalt, plastics, hot melt adhesives, etc. are all common hot melt materials that can be made into strips and wrapped around the edge of the centrifugal disc.

[0026] Further improvements to the technical solution include the addition of a cooling chamber within the centrifuge disc, through which a liquid or gaseous cooling medium is introduced.

[0027] The beneficial effects of implementing the above technical solution are that the cooling chamber inside the centrifugal disc can cool the molten droplets, allowing them to reach a semi-solid state before impacting the deposition layer; on the other hand, it can reduce the temperature of the centrifugal disc itself, preventing the hot-melt material from melting in the centrifugal disc.

[0028] The technical solution is further improved, and the expression for the logarithmic spiral is:

[0029] r1=R*e θ ;

[0030] In the formula, r1 is the polar diameter, R is the radius of the molten cylinder, θ is the polar angle, and θ > π.

[0031] The beneficial effects of implementing the above technical solution are: the polar angle θ > π, which can increase the stiffness of the logarithmic spiral, and the centrifugal acceleration of the molten droplet will increase exponentially with the polar angle θ. Attached Figure Description

[0032] Figure 1 The diagram shown is a cross-sectional view of an existing centrifuge disc in operation.

[0033] Figure 2 What is shown is Figure 1 Top view.

[0034] Figure 3 The diagram shown is a three-dimensional structural schematic of the centrifuge disc in Example 1.

[0035] Figure 4 The diagram shown is a cross-sectional view of the centrifuge disc.

[0036] Figure 5 The diagram shows the structure when the piston rod moves upward.

[0037] Figure 6 The diagram shown illustrates the structure when the piston rod is moving downwards.

[0038] Figure 7 The diagram shown illustrates the process of molten metal entering the outlet hole.

[0039] Figure 8 The diagram shown is a schematic of the molten liquid before it is ejected from the outlet hole.

[0040] Figure 9 The diagram shown is a motion analysis diagram of the ball within the radial groove.

[0041] Figure 10 The diagram shows the trajectory of the ball within the logarithmic spiral groove at time T1.

[0042] Figure 11 The diagram shows the trajectory of the ball within the logarithmic spiral groove at time T21.

[0043] Figure 12 The diagram shown is a motion analysis diagram of a small ball within a logarithmic spiral groove.

[0044] Figure 13 The diagram shown is a three-dimensional structural schematic of the centrifuge disc in Example 2.

[0045] Figure 14 What is shown is Figure 9 A schematic diagram of the cross-sectional structure.

[0046] Figure 15-16 The diagram shown is a cross-sectional view of the centrifuge disc in Example 3.

[0047] In the picture:

[0048] 1. Centrifuge disc; 11. Spillway; 12. Cooling chamber; 13. Hot melt material; 14. Radial groove; 15. Cooling chamber;

[0049] 2. Molten liquid cylinder; 21. Liquid outlet;

[0050] 3. Piston rod;

[0051] 4. Injection tubing;

[0052] 5. Eccentric shaft;

[0053] 6. Speed-regulating motor

[0054] 7. Molten droplets;

[0055] 8. Sedimentary layer;

[0056] 9. Small ball. Detailed Implementation

[0057] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that in the description of the present invention, terms such as "front," "rear," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation of the present invention. It should also be noted that in the description of the present invention, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0058] Example 1:

[0059] like Figure 3 As shown, a centrifugal disc for centrifugal jet forming has ten circumferentially extending liquid-throwing grooves 11 evenly distributed on its surface. A molten metal cylinder 2 is fixed at the center of the centrifugal disc 1. The molten metal cylinder 2 is made of high-temperature resistant heat-insulating material and contains molten metal. Ten liquid outlet holes 21 are provided circumferentially on the cylinder wall of the molten metal cylinder 2.

[0060] Reference Figure 4 A piston rod 3 is installed inside the molten metal cylinder 2. The piston rod 3 is made of a high-temperature resistant non-metallic material. Driven by an external force, the piston rod 3 slides up and down inside the molten metal cylinder 2. At this time, the piston part of the piston rod 3 can block or open the outlet hole 21.

[0061] Reference Figure 5 During operation, the centrifugal disc 1 rotates, causing the piston rod 3 to move upwards, opening the outlet hole 21. Under centrifugal force, the molten liquid in the molten liquid cylinder 2 flows towards the cylinder wall, and the liquid level on the cylinder wall is higher than the height of the outlet hole 21. In this way, some of the molten liquid can enter the outlet hole 21.

[0062] Reference Figure 6 When piston rod 3 moves downward, it blocks the outlet hole 21. At this time, the molten liquid in the molten cylinder 2 cannot enter the outlet hole 21, and the molten liquid that enters the outlet hole 21 is thrown outward to form droplets. In this way, by adjusting the frequency of the piston rod 3 sliding up and down, the quantity and volume of molten liquid thrown out of the outlet hole 21 can be controlled, thereby obtaining droplets with nearly uniform diameter.

[0063] The size of the molten droplets is related to parameters such as the rotational speed of the centrifugal disk, the aperture diameter of the liquid outlet hole 21, the radius of the molten liquid cylinder 2, and the frequency of the up and down movement of the piston rod 3. Among them, the aperture diameter of the liquid outlet hole 21 and the frequency of the up and down movement of the piston rod 3 play crucial roles in the generation of the molten droplets and the size of the generated molten droplets. Therefore, in order to obtain molten droplets with a diameter in the range of 1 - 3 mm, it is necessary to determine the aperture diameter of the liquid outlet hole 21 and the frequency of the up and down movement of the piston rod 3.

[0064] The aperture diameter of the liquid outlet hole and the frequency of the up and down movement of the piston rod, the derivation process is as follows:

[0065] Let the radius of the liquid outlet hole be r, and let the frequency of the up and down movement of the piston rod be f. Known conditions: R is the radius of the molten liquid cylinder, Sr is the spherical radius of the molten droplet, and ω is the rotational speed of the centrifugal disk.

[0066] Let the ratio of the radius r of the liquid outlet hole to the spherical radius of the molten droplet be K, then there is:

[0067] r = K * Sr (1)

[0068] Refer to Figure 7 . Consider the molten liquid entering the liquid outlet hole as a cylinder, and consider the process of the molten liquid entering the liquid outlet hole as a uniformly accelerated linear motion with an initial velocity of zero, then there is:

[0069]

[0070] In formula (2), L is the length of the molten liquid entering the liquid outlet hole during the opening period of the liquid outlet hole.

[0071] Since the volume of the cylindrical molten liquid is equal to that of the spherical molten droplet, then there is:

[0072]

[0073] Refer to Figure 8 . During the process of the molten droplet 7 being thrown out of the liquid outlet hole 21, a surface tension F will be generated at the outlet part of the liquid outlet hole 21 t , then there is:

[0074] F r = C * F t (4)

[0075] In formula (4), F r is the centrifugal force received by the molten droplet, C is the coefficient for the molten droplet to break away from the liquid outlet hole, and C ≥ 1. If F < f, it indicates that the molten droplet cannot break away from the liquid outlet hole. [[ID=​​​​​​​

[0078] It should be noted that if the radius of the outlet orifice is much larger than the radius of the molten droplet, the mass of the molten droplet is large, and the centrifugal force F experienced by the molten droplet is greater. r It is also much greater than the surface tension F. t At this time, the surface tension F t It can even be ignored. However, if the outlet orifice is too large, the molten droplet will form more than two droplets during the process of being ejected from the orifice, which does not conform to the original design intention. Therefore, the radius of the outlet orifice can only be close to the spherical radius of the molten droplet.

[0079] Under the same conditions, the smaller the radius of the outlet orifice, the greater the influence of surface tension on the molten droplet, and the less likely the droplet is to be ejected from the outlet orifice. Since the spherical radius of the molten droplet is only 0.5-1.5 mm, the influence of surface tension on the droplet must be fully considered.

[0080] Centrifugal force F on the molten droplet r for:

[0081] F r =mω 2 R = ρπr 2 Lω 2 R (6)

[0082] In equation (6), m is the mass of the molten droplet and ρ is the density of the molten metal. Since the wall of the molten metal cylinder is very thin, the total length of the outlet hole can be ignored. Therefore, the radius of the molten metal cylinder can be used as the length of the molten droplet from the center of the circle.

[0083] Combining equations (1-6), we have:

[0084]

[0085]

[0086]

[0087] The above formula reveals the relationship between the radius of the liquid outlet, the frequency of the piston rod's up-and-down movement, and related parameters. Based on the desired droplet sphere radius, the radius of the liquid outlet and the frequency of the piston rod's up-and-down movement can be calculated in reverse, providing a theoretical basis for controlling the size of the droplet.

[0088] Figure 3 In the process, the center line of the slinger 11 is a logarithmic spiral line centered on the center of the disk. To study the motion of the molten droplets in the slinger, it is necessary to first study the trajectory of the small ball in the radial groove.

[0089] Reference Figure 9When the centrifugal disc 1 rotates counterclockwise, the ball 9 is subjected to two forces within the radial groove 14: one is the pushing force Ft exerted by the radial groove 14 on the ball 9, and the other is the centrifugal force Fr. The resultant force of the pushing force Ft and the centrifugal force Fr is F, and the direction of the resultant force F is inclined, with an angle α between it and the radial line.

[0090] Similarly, ball 9 generates two velocities: a circumferential velocity Vt, the direction of which is the same as the thrust Ft, and the magnitude of which depends on the rotational speed of the centrifugal disk 1 and the position of ball 9; and a radial velocity Vr, the direction of which is the same as the centrifugal force Fr, and the magnitude of which is related to the centrifugal force Fr. The resultant velocity of Vt and Vr is V, and the direction of the resultant velocity V is also inclined, with an angle α between it and the radial line. This indicates that ball 9 will be thrown out of the radial groove 14 in an inclined direction.

[0091] If observed from within the centrifugal disk 1, the ball 9 appears to be undergoing linear motion with variable acceleration within the radial groove 14, where acceleration increases with radius. However, if observed from outside the centrifugal disk 1, the ball 9 not only undergoes linear motion with variable acceleration within the radial groove 14 but also circular motion with increasing rotational speed in the circumferential direction. Thus, the trajectory of the ball 9 on the centrifugal disk 1 is a logarithmic spiral centered at the disk's center.

[0092] According to the properties of the logarithmic spiral, the angle between the tangent at any point on it and the radial line is equal. Therefore, the angle α between the resultant force F and the radial line will not change, and the angle α between the resultant velocity V and the radial line will also not change.

[0093] For the formula for the logarithmic spiral: r1=R*e θ When θ > π, Vr ≈ Vt, Ft ≈ Fr. In this case, α is approximately 45°. Furthermore, a polar angle θ > π increases the stiffness of the logarithmic spiral, and the centrifugal acceleration of ball 9 increases exponentially with the polar angle θ.

[0094] So, let's change our perspective and change the reference target. If we create a liquid-spraying trough 11 with a logarithmic spiral centerline on the centrifuge disc 1, and place a small ball 9 with an initial velocity of zero inside the liquid-spraying trough 11, and then rotate the centrifuge disc 1 clockwise, then when observed from outside the centrifuge disc 1, the trajectory of the small ball 9 within the liquid-spraying trough 11 will be a logarithmic spiral.

[0095] Referring to 10. At time T1, standing outside the centrifuge disk 1, it can be observed that ball 9 is located at point P1 in the logarithmic spiral groove. At this time, ball 9 is also located in the virtual radial groove 14.

[0096] Reference Figure 11 At time T2, if observed from outside the centrifugal disk 1, the ball 9 can be seen moving to point P2 in the logarithmic spiral groove. At this time, the ball 9 is still located in the virtual radial groove 14.

[0097] Therefore, viewed from outside the centrifugal disk 1, the ball 9 is essentially moving within a non-rotating radial groove 14, undergoing variable acceleration linear motion with its radius continuously increasing. The angle of the radial groove 14 is related to the initial position of the ball 9. This indicates that the ball 9 will be thrown out radially from the centrifugal disk 1.

[0098] Reference Figure 12 Because the centrifugal disk 1 has reversed its direction, the directions of Vt and thrust Ft have also reversed. At this time, the resultant velocity of Vt and V is Vr, and the resultant force of Ft and F is Fr. Compared with the motion of ball 9 in the radial groove 14, the ejection velocity of ball 9 will be reduced.

[0099] In this invention, the molten droplet 7 is equivalent to a small ball 9. Observed from outside the centrifuge disk 1, the trajectory of the molten droplet 7 in the sling bath 11 is a straight line, and this straight line is the radial line of the centrifuge disk 1. The molten droplet 7 can be ejected radially along the centrifuge disk 1, impacting the deposition layer 8 in a forward direction. Because it is a forward impact, the molten droplet 7 directly fuses with the deposition layer 8 after impacting it. A small amount of sputtering may occur, but no reflection will occur. This solves the problem of the reflected molten droplet 7 impacting the deposition layer 8 again from the source. Compared with oblique impact, this radial forward impact not only helps to improve the density of the fusion between the molten droplet 7 and the deposition layer 8 and form a fine grain structure, but also allows the molten droplet 7 to almost completely fuse with the deposition layer 8, greatly improving the effective deposition rate of the metallic material.

[0100] Furthermore, the movement of the molten droplet 7 within the centrifugal casting tank 11 is independent of the rotational speed. In other words, regardless of the rotational speed of the centrifugal disc 1, the molten droplet 7 can always be ejected radially from the centrifugal disc 1.

[0101] Example 2:

[0102] Reference Figure 13-14 In this embodiment, a liquid injection pipe 4 is provided inside the piston rod 3, and a crucible is connected above the liquid injection pipe 4. The liquid injection pipe 4 is used to inject molten metal into the molten metal cylinder 2 to ensure that a certain amount of molten metal is always retained in the molten metal cylinder 2.

[0103] An external spline is provided on the injection tube 4, and an internal spline is provided on the upper part of the piston rod 3, allowing the piston rod 3 to slide up and down along the injection tube 4. The external and internal splines cooperate to prevent the piston rod 3 from rotating relative to the injection tube 4.

[0104] A transverse groove is provided on the upper part of the piston rod 3, and an eccentric shaft 5 is installed in the transverse groove. The eccentric shaft 5 is connected to the speed-regulating motor 6. When the speed-regulating motor 6 rotates, the piston rod 3 is driven to slide up and down through the cooperation of the eccentric shaft 5 and the groove.

[0105] The frequency of the piston rod 3's up-and-down movement depends on the rotational speed of the speed-regulating motor 6. For every revolution of the speed-regulating motor 6, the piston rod 3 moves up and down once. The frequency of the piston rod 3's up-and-down movement can be adjusted by changing the rotational speed of the speed-regulating motor 6.

[0106] Besides the structure mentioned above, there are many other mechanisms that can drive the piston rod 3 to perform reciprocating linear motion, such as crank-slider mechanism, cam-slider mechanism, cylinder, etc.

[0107] Example 3:

[0108] Reference Figure 15 In this embodiment, a ring of hot melt material 13 is wrapped around the edge of the centrifugal disc 1. During operation, the centrifugal disc 1 rotates and the workpiece moves up and down. After the molten droplets 7 are thrown off the centrifugal disc 1, they hit the deposition layer 8 of the workpiece and are reflected. The reflected molten droplets 7 are captured by the hot melt material 13 after hitting the hot melt material 13 and remain in the hot melt material 13.

[0109] The impact motion is complex, and the direction of some reflected droplets is unpredictable. However, since molten metal droplets are highly heated liquids, when droplet 7 impacts the molten material 13, it can instantly soften the molten material 13. At this point, droplet 7 will embed or penetrate into the molten material 13, losing its kinetic energy for further reflection and thus preventing it from impacting the deposition layer 8. This fundamentally solves the problem of reflected droplets impacting the deposition layer again.

[0110] In this embodiment, a circumferential annular groove is provided at the edge of the centrifugal disc 1, and the hot melt material 13 is wound inside the circumferential annular groove. The width of the circumferential annular groove is greater than the height of the formed workpiece, which expands the capture area of ​​the hot melt material 13 for the molten droplets 7. The hot melt material can be any of asphalt, plastic, or hot melt adhesive. In use, materials such as asphalt, plastic, and hot melt adhesive can be made into strips and then wrapped around the circumferential annular groove.

[0111] Reference Figure 16 A further improvement to the technical solution is the inclusion of a cooling chamber 15 within the centrifugal disc 1, into which coolant is circulated. Furthermore, the molten metal cylinder 2, made of high-temperature resistant insulating material, is embedded in the centrifugal disc 1, thus preventing the molten metal in the cylinder 2 from transferring heat to the centrifugal disc 1.

[0112] A cooling chamber 15 is provided inside the centrifugal disc 1. On the one hand, the molten droplets 7 can be cooled and reach a semi-solid state before impacting the deposition layer. On the other hand, the temperature of the centrifugal disc 1 itself can be reduced to prevent the hot molten material 13 from being melted by the centrifugal disc 1.

[0113] The hot melt material needs to be replaced periodically, and the replaced hot melt material contains solidified metal. To recover the metal, the hot melt material can be removed by hot melting, and the metal can be filtered out.

[0114] The parts not detailed herein are prior art. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A centrifugal disc for centrifugal jet forming, characterized in that: Multiple slugs are evenly distributed circumferentially on the surface of the centrifugal disc, with the center line of each slug being a logarithmic spiral line centered on the center of the disc. A molten metal cylinder is located at the center of the disc, and outlet holes communicating with each slug are provided on the cylinder wall. A piston rod is installed inside the molten metal cylinder, which can slide up and down to close or open the outlet holes, so that the molten metal in the molten metal cylinder is thrown out of the outlet holes at intervals and in a quantitative manner to form molten droplets. Let the radius of the outlet hole be r, and the frequency of the piston rod's up-and-down movement be f, then we have: In the formula, Sr is the spherical radius of the molten droplet, K is the ratio of the outlet hole radius r to the spherical radius Sr of the molten droplet, R is the radius of the molten liquid cylinder, ρ is the density of the molten metal, ω is the rotational speed of the centrifugal disc, σ is the surface tension coefficient of the molten metal, and C is the coefficient for the molten droplet to detach from the outlet hole, C≥1.

2. The centrifugal disc for centrifugal jet forming as described in claim 1, characterized in that: A liquid injection pipe is installed inside the piston rod, which is used to inject molten metal into the molten metal cylinder.

3. A centrifugal disc for centrifugal jet forming as described in claim 1, characterized in that: in The upper part of the piston rod is provided with a transverse sliding groove, and an eccentric shaft is installed in the transverse sliding groove. The eccentric shaft is connected to a speed-regulating motor. When the speed-regulating motor rotates, the piston rod is driven to slide up and down through the cooperation of the eccentric shaft and the sliding groove.

4. A centrifugal disc for centrifugal jet forming as described in claim 1, characterized in that: in The edge of the centrifugal disc is wrapped with a ring of hot melt material. When the centrifugal disc rotates during operation, the molten droplets are thrown off the centrifugal disc and hit the deposition layer and are reflected. The reflected molten droplets are captured by the hot melt material after hitting the hot melt material.

5. A centrifugal disc for centrifugal jet forming as described in claim 4, characterized in that: The hot melt material is either asphalt or plastic.

6. A centrifugal disc for centrifugal jet forming as described in claim 1, characterized in that: A cooling chamber is provided inside the centrifuge disc, and a cooling medium is introduced into the cooling chamber.

7. A centrifugal disc for centrifugal jet forming as described in claim 1, characterized in that: The expression for the logarithmic spiral is: In the formula, R is the polar diameter, R is the radius of the molten cylinder, and θ is the polar angle, where θ > π.

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