Cored wire production method

Abstract

The application discloses a kind of core-spun yarn production methods, comprising: synchronous conveying core wire, powder and strip steel;Core wire is transported to fixed inner liner pipe, powder is transported to the cavity between inner liner pipe and core wire, and strip steel is continuously made into covering pipe along inner liner pipe at one end downstream of inner liner pipe, covering pipe advances along inner liner pipe and is always connected with inner liner pipe;Core wire and powder are simultaneously entered into the covering pipe connected from inner liner pipe, and powder is compacted in the inner cavity of covering pipe under the impact of air pulse.The core-spun yarn production device disclosed in the application uses air pulse transportation and compacts powder, without the need to reduce the diameter of strip steel for extrusion, saving strip steel.

Description

Technical Field

[0001] This invention belongs to the field of cored wire production lines, and particularly relates to a method for producing cored wire. Background Technology

[0002] In the ductile iron casting process, pretreatments such as desulfurization, deoxidation, and purification of molten iron, as well as spheroidization treatment, require the addition of desulfurizing, deoxidizing, and spheroidizing-promoting cored wires to the molten iron. Currently, the cored wires are added using alloy cored wires such as spheroidizing cored wires and inoculated cored wires, fed into the molten iron through a wire feeder to achieve spheroidization, inoculation, desulfurization, and deoxidation effects, thereby improving the quality of the molten iron and increasing the yield of cast products.

[0003] Various cored wires containing alloying elements such as magnesium, silicon, rare earth elements, calcium, and barium consist of a steel strip and a powder layer encased within it. The powder layer is either rare earth magnesium-silicon alloy powder, or a mixture of magnesium powder and other silicon-based alloy powders, or multi-element powders. In use, the cored wire is inserted into the molten iron from its surface and penetrates to reach its interior for reaction. This process purifies the molten iron of impurities and anti-spheroidizing elements, achieving the spheroidization process of cast iron, improving the material properties of the molten iron, enhancing the performance of cast iron, and significantly increasing the alloy yield from the cored wire. This reduces alloy consumption, lowers casting costs, and results in significant economic benefits.

[0004] Existing cored wires encapsulate powder within a strip steel. This process involves gradually reducing the inner diameter of the strip by closing it and pressing the interfaces on both sides of the strip to a close fit, ensuring the edges of the strip are pressed together. The pressed portions are then fixed together and bent to adhere to the surface of the cored wire, resulting in a cylindrical shape. Specifically: the strip steel initially forms a C-shaped opening of 8mm-15mm using multiple sets of pressing rollers and dies; once fully formed, the edges at both ends are pressed together to form a pressing edge, which protrudes from the tubular strip steel; after fixing, the pressing edge is bent to adhere to the surface of the tube.

[0005] However, using this method to manufacture cored wires not only leads to complex strip forming processes and uneven powder filling, which can easily cause problems such as powder leakage, empty wires, and cracking, but also wastes the surface area of ​​the strip, resulting in more strips being needed to process the same type of coated tube. Summary of the Invention

[0006] This invention provides a method for producing cored wire to solve the technical problems mentioned in the background art, such as strip waste, empty wire, cracking, and uneven powder filling caused by unreasonable powder filling structure.

[0007] To achieve the above objectives, the specific technical solution of the cored wire production method of the present invention is as follows:

[0008] A method for producing cored wire includes: synchronously conveying core wire, powder, and strip steel; conveying the core wire to a fixed inner liner tube, conveying the powder to the cavity between the inner liner tube and the core wire, and continuously forming a coating tube along the inner liner tube at one downstream end of the inner liner tube, the coating tube advancing along the inner liner tube and always in contact with the inner liner tube; the core wire and powder entering the connected coating tube synchronously from the inner liner tube, and the powder being compacted into the inner cavity of the coating tube under the impact of air pulses.

[0009] Furthermore, the core wire advances along the axis of the inner liner tube and is always located at the center of the inner liner tube.

[0010] Furthermore, the strip steel is continuously formed into a covered pipe along the inner lining pipe at one downstream end, including:

[0011] The steel strip is extruded and bent into a tubular shape along the inner liner tube;

[0012] The strip is welded to the junction of the two edges to form a covered tube.

[0013] Furthermore, the strip is extruded to bend it into a tubular shape along the inner liner, including overlapping the two edges of the strip.

[0014] Furthermore, laser welding is used at the junction of the two edges of the welded strip.

[0015] Furthermore, before welding the strip, the junction of the two edges of the strip is flattened to form a pressure-pressed surface for the cladding tube.

[0016] Furthermore, the method also includes: winding the formed cored wire onto a rewinding wheel to hold the cored wire.

[0017] Furthermore, the method also includes: passivating the surface of the core wire and drying the passivation layer during the conveying of the core wire.

[0018] Furthermore, the method further includes: before conveying the powder, the method further includes mixing the particles of each component according to the process ratio and mixing the particles in a vacuum environment, wherein each particle contains only one component.

[0019] Furthermore, the end cap is closed on the head of the cored wire, so that the end cap blocks the head of the covered tube.

[0020] The cored wire production method of the present invention has the following advantages:

[0021] 1. The transportation and filling of powder are carried out in the inner lining pipe and the covering pipe, which reduces the powder spillage, ensures a relatively clean construction environment, and reduces environmental pollution;

[0022] 2. The initial filling of powder is carried out on the inner liner tube, rather than at the U-shaped groove formed by the bending of the strip steel. There is no need to consider the powder flying out and overflowing from the strip steel. Therefore, the powder outlet of this application can be much larger than the outlet diameter in the prior art, so that the powder can be conveyed in a large flow rate and the production rate of the cored wire can be increased.

[0023] 3. The powder is introduced into the inner cavity of the coating tube by air pulse, and the powder blocking part is used to compact the powder in the inner cavity of the coating tube. At the same time, since the powder blocking part is located at the head of the coating tube, the air pulse brings air and powder into the coating tube from the feed port. The powder blocking part blocks the powder, and the pressure of the air pulse compacts the powder. The powder can be compacted without reducing the diameter of the coating tube, which ensures that the powder is filled evenly and not densely, and prevents problems such as cracking and empty wires in the cored wire.

[0024] 4. By joining steel strips together to form a covered tube, the limited area of ​​the steel strip can be effectively utilized, ensuring that it can be effectively converted into the cross-sectional area of ​​the covered tube, thereby saving the consumption of steel strip.

[0025] 5. Laser welding utilizes extremely rapid heating and cooling rates, resulting in a small heat-affected zone; welding stress and deformation are minimal, effectively allowing for the welding of strip steel into its final shape. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the cored wire of the present invention;

[0027] Figure 2 This is a longitudinal sectional view of the cored wire of the present invention;

[0028] Figure 3 This is a schematic diagram of the cored wire production apparatus of the present invention;

[0029] Figure 4 This is a cross-sectional view of the inlet, feed inlet, and air inlet of the inner liner tube of the present invention;

[0030] Figure 5 This is a schematic diagram of the forming of the outer steel strip of the inner liner tube according to the present invention;

[0031] Figure 6 This is a cross-sectional view of the inner lining of the inner lining tube of the present invention;

[0032] Figure 7 This is a schematic diagram of the structure of the second conveying branch of the present invention;

[0033] Figure 8 This is a schematic diagram of the rewinding mechanism of the present invention;

[0034] Figure 9 This is a flowchart of the cored wire production method of the present invention.

[0035] Explanation of markings in the diagram:

[0036] 1. Cored wire; 11. Covered tube; 111. Strip steel; 2. Powder; 13. Core wire; 14. End cap; 15. Pressing plane; 2. First conveying branch; 21. Passivation mechanism; 22. Hot drying mechanism; 3. Second conveying branch; 31. Batching bin; 32. Vacuum mixing equipment; 4. Third conveying branch; 5. Inner liner; 51. Inlet; 52. Feed inlet; 53. Air inlet; 531. Connecting pipe; 54. Discharge outlet; 55. Inner liner; 56. Ceramic part; 6. Air pulse pump; 7. Material tank; 71. Powder outlet; 8. Shaping mechanism; 81. Forming roller; 82. Pressure roller; 9. Welding mechanism. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0041] Example 1

[0042] like Figure 1 As shown, the cored wire production apparatus of the present invention is used to produce cored wire 1. Figure 1 and Figure 2 As shown, the cored wire 1 has three layers from the inside out: an outer layer of a sheath tube 11 made of strip steel 111, a powder 12 filled in the sheath tube 11, and a core wire 13 located at the center of the powder 12.

[0043] Correspondingly, such as Figure 3 As shown, to produce cored wire 1 from three raw materials—steel strip 111, powder 12, and core wire 13—the cored wire production device is equipped with three conveying branches. The first conveying branch 2 is used to transport the core wire 13, the second conveying branch 3 is used to transport the powder 12, and the third conveying branch 4 is used to transport the steel strip 111. The first and second conveying branches 2 and 3 first converge, filling the core wire 13 with powder 12. Then, the third conveying branch 4 merges, wrapping the steel strip 111 around the powder 12 and core wire 13, thus producing the cored wire 1. The three conveying branches correspond to specific conveyors, which are existing technologies in the field and will not be described further in this embodiment.

[0044] To merge the three conveying branches mentioned above, the cored wire production device includes an inner liner tube 5. The upstream end of the inner liner tube 5 has an inlet 51 for inserting the core wire 13, allowing the core wire 13 to be conveyed along the axis within the inner liner tube 5. The side wall of the inner liner tube 5 has an inlet 52 for powder 12 to enter. Between the inlet 52 and the inlet 51, the inner liner tube 5 has an air inlet 53, which is connected to an air pulse pump 6, causing the powder 12 to fill around the core wire 13 and within the inner liner tube 5. Conveying; the inner liner tube 5 has an outlet 54 at its downstream end for discharging powder 12 and core wire 13. The outer wall of the downstream side of the inner liner tube 5 is provided with an inner liner part 55. The inner liner part 55 is for the strip steel 111 to be bent into a tube. The strip steel 111 formed into a tube is sleeved outside the inner liner part 55 and slides forward along the inner liner tube 5. The air pulse pump 6 periodically sprays airflow to carry the powder 12 out of the inner liner tube 5 and presses it into the strip steel 111 formed into a tube together with the core wire 13, so as to compact the powder 12 into the strip steel 111.

[0045] The inner liner tube 5 serves to combine three raw materials. Powder 12 is conveyed under positive pressure inside the inner cavity of the inner liner tube 5. At the same time, the outer wall of the rear end of the inner liner tube 5 is used as the inner liner part 55. Strip steel 111 is bent into a tube outside the inner liner part 55 and welded to form a welded pipe, which serves as the covering tube 11 of the cored wire 1. With the continuous transport of strip steel 111, powder 12 and cored wire 13 by the three conveying branches, the covering tube 11 is transported outside the inner liner tube 5, while the cored wire 13 and powder 12 are transported inside the inner liner tube 5. When the three semi-finished products are transported to the outside of the inner liner tube 5, powder 12 and cored wire 13 automatically enter the covering tube 11. Air pulses compress the powder 12 into the inner liner tube 5.

[0046] By employing the inner liner tube 5, the transportation and filling of powder 12 are carried out within the inner liner tube 5 and the covering tube 11, reducing the outward spillage of powder 12, ensuring a relatively clean construction environment, and reducing environmental pollution. Furthermore, the use of air pulses to compact the powder 12 eliminates the need for compaction of the narrowed strip steel 111 in existing technologies, effectively saving the amount of strip steel 111 used.

[0047] To ensure the powder 12 is compacted within the coating tube 11, a powder-blocking section is provided at the head of the cored wire 1. This section blocks the powder 12, allowing it to fill between the coating tube 11 and the metal core wire 13. The powder-blocking section includes the powder 12 already filled and fixed within the coating tube 11. As the cored wire 1 is produced on the assembly line, the powder 12 already inside the coating tube 11 is fixed and then acts as a powder-blocking section to hold the powder 12 subsequently injected by air pulses. This process naturally occurs during continuous production of the cored wire. Of course, the powder 12 in the cored wire 1 produced at startup is relatively loose and needs to be discarded. To reduce the amount discarded, the powder-blocking section also includes an end cap 14 fixed to the head of the coating tube 11. The end cap 14 blocks the head of the coating tube 11, blocking the powder 12 and compacting it, thus improving the compaction degree of the powder 12 in the initial production phase. The powder 12 is transported by the pressure wave generated by the air pulse. At the peak of the air pulse, the air forces the powder 12 into the coating tube 11, filling the space between the core wire 13 and the coating tube 11, and the powder is compacted by the powder-blocking part. At the trough of the air pulse, the air forced into the coating tube 11 is discharged from the gap at the junction of the coating tube 11 and the inner liner tube 5, completing the compaction of the powder 12 in a section of the core wire 1.

[0048] In one embodiment, combined Figure 4 As shown, the inner liner 5 is a horizontally placed tube, so that the inlet 51 and the outlet 54 are located at both ends. A sealing ring can also be installed inside the inlet 51 to reduce air pulse dispersion.

[0049] The inlet 52 of the inner liner tube 5 is connected to the material tank 7 containing powder 12. The lower end of the material tank 7 has a powder outlet 71 that communicates with the inlet 52. The powder 12 is fed into the inlet 52 through the powder outlet 71. Compared with the prior art, the powder outlet 71 is connected to the inner liner tube 5, rather than at the U-shaped groove formed by bending the strip 111. There is no need to consider the situation of powder 12 splashing out and overflowing from the U-shaped groove. Therefore, the powder outlet 71 of this application can be much larger than the diameter in the prior art, so that the powder 12 can be conveyed in a large flow rate, and the production rate of the cored wire 1 can be increased.

[0050] The air inlet 53 has a connecting pipe 531 that is inclined relative to the inner liner 5. The upstream end of the connecting pipe 531 is connected to the air pulse pump 6, and the downstream end of the connecting pipe 531 faces the feed inlet 52 to reduce the resistance to entering the inner liner 5. The air inlet 53 and the connecting pipe 531 only need to be located upstream of the feed inlet 52 to blow the powder material 12 from upstream to downstream.

[0051] Combination Figure 5 As shown, a shaping mechanism 8 is provided around the inner lining 55. The shaping mechanism 8 compresses the strip steel 111, causing the strip steel 111 to bend into a tube along the inner lining 55 and fit over the outer side of the inner lining 55. The shaping mechanism 8 is existing technology in the field. Different shaping mechanisms 8 can be used depending on the welding process of the strip steel 111.

[0052] In one embodiment, the forming mechanism 8 employs a cold rolling process for straight seam welded pipes, including rotatable forming rollers 81 arranged opposite each other. The two edges of the strip 111 pass between the two forming rollers 81, bending the strip 111 into a pipe. The two forming rollers 81 in each group can be arranged laterally or longitudinally. The forming mechanism 8 also includes a rotatable pressure roller 82, which abuts against the junction of the two edges of the strip 111 to form a pressure surface 15 on the covered pipe 11, facilitating subsequent welding.

[0053] Combination Figure 5 and Figure 6 As shown, a welding mechanism 9 is located downstream of the shaping mechanism 8. The welding mechanism 9 welds the junction of the two edges of the strip steel 111, forming a covered tube 11 from the strip steel 111. The welding mechanism 9 can use an existing laser welding machine, which is fast, efficient, and produces less pollution. A ceramic part 56 is provided at the welding position of the strip steel 111 in the inner liner tube 5. The ceramic part 56 is fitted inside the tubular strip steel 111, using ceramic to prevent the strip steel 111 and the rest of the inner liner tube 5 from being welded together. The ceramic part 56 can be embedded or threaded onto the inner liner tube 5 for installation and fixation.

[0054] The first conveying branch is also equipped with a passivation mechanism 21. The passivation mechanism 21 includes a housing, and a spray gun is installed inside the housing. The nozzle of the spray gun is directed towards the core wire 13, and the spray gun sprays passivation liquid to form a passivation layer on the surface of the core wire 13. Downstream of the passivation layer, a thermal drying mechanism 22 is provided. The thermal drying mechanism 22 includes a heating wire and a fan. The fan blows the hot air generated by the heating wire toward the passivation layer, accelerating the formation of the passivation layer.

[0055] Combination Figure 7 As shown, in addition to the material tank 7, the second conveying branch 3 also includes a batching bin 31 and a vacuum mixing device 32 located upstream of the material tank 7. The batching bin 31 has multiple compartments, each containing particles of a specific composition. Each compartment is equipped with a discharge valve to proportionally distribute the components of the powder 12 by opening and closing the valve. The vacuum mixing device 32 is connected to the batching bin 31 to transport the proportioned particles to the vacuum mixing device 32 for mixing. The batching bin 31 is connected to the material tank 7 to transport the mixed powder 12 into the material tank 7 for filling under the impact of air pulses. This embodiment employs a particle mixing process to reduce component loss during alloy sintering and prevent component segregation of the powder 12.

[0056] In addition, such as Figure 8 As shown, a rewinding mechanism is provided downstream of the discharge port 54. The rewinding mechanism includes a rotatable wheel. The head of the coating tube 11 is wound around the wheel. As the wheel rotates, the cored wire 1 is packaged into a product.

[0057] In summary, the core wire 13, powder 12, and strip steel 111 are transported synchronously along the three conveying branches. The core wire 13 is inserted into the inner liner tube 5. At the same time, the powder outlet 71 is opened, and the powder 12 enters the inner liner tube 5. Driven by the air pulse, the powder 12 fills around the core wire 13 and moves synchronously along the inner liner tube 5 with the core wire 13. The strip steel 111 continuously forms a covering tube 11 on the inner liner 55. The covering tube 11 moves along the inner liner tube 5 and is always in contact with the inner liner tube 5. The powder 12 and the core wire 13 enter the covering tube 11 synchronously from the inner liner tube 5. Under the pressure of the air pulse, the powder 12 is pressed between the core wire 13 and the covering tube 11.

[0058] Example 2

[0059] like Figure 9 As shown, the present invention also discloses a method for producing cored wire, comprising:

[0060] Synchronous conveying of core wire 13, powder 12 and strip steel 111,

[0061] The core wire 13 is conveyed to the fixed inner liner tube 5, and the powder 12 is conveyed to the cavity between the inner liner tube 5 and the core wire 13. The strip steel 111 is continuously formed into a covering tube 11 along the inner liner tube 5 at one downstream end of the inner liner tube 5. The covering tube 11 advances along the inner liner tube 5 and is always connected to the inner liner tube 5.

[0062] The core wire 13 and the powder 12 enter the connected coating tube 11 simultaneously from the inner liner tube 5, and the powder 12 is compacted into the inner cavity of the coating tube 11 under the impact of the air pulse.

[0063] Specifically, in order to ensure that the powder 12 is compacted, the end cap 14 is closed on the head of the cored wire 1, and the end cap 14 blocks the head of the covering tube 11.

[0064] Specifically, the core wire 13 advances along the axis of the inner liner tube 5 and is always located at the center of the inner liner tube 5, so as to ensure that the core wire 13 of the formed core wire 1 is located at the center of the covering tube 11.

[0065] Specifically, the strip steel 111 is continuously formed into a covered tube 11 along the inner liner tube 5 at one downstream end of the inner liner tube 5, including:

[0066] The strip 111 is extruded to bend the strip 111 into a tubular shape along the inner liner tube 5;

[0067] Weld the junction of the two edges of the strip steel 111 to form a covered tube 11.

[0068] The process of extruding the strip 111 involves bending the strip 111 into a tubular shape along the inner liner tube 5, including overlapping the two sides of the strip 111 to ensure the quality of subsequent welding.

[0069] Laser welding is preferred at the junction of the two edges of the 111 welded strip, as it is fast, efficient, and produces less pollution.

[0070] Furthermore, before welding the strip 111, the junction of the two edges of the strip 111 is flattened so that the covered tube 11 forms a pressure surface 15, which facilitates subsequent welding.

[0071] After the powder 12 is compacted into the inner cavity of the coating tube 11, the method further includes winding the formed cored wire 1 onto a rewinding wheel to receive the cored wire 1.

[0072] In addition, during the conveying of the core wire 13, the surface of the core wire 13 is passivated to form a passivation layer; and the passivation layer is dried to accelerate the formation of the passivation layer.

[0073] Before conveying the powder 12, the method further includes mixing the particles of each component according to the process ratio and mixing the particles in a vacuum environment, wherein each particle contains only one component.

[0074] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A method for producing cored wire, characterized in that, include: Synchronous conveying of core wire, powder, and strip steel; The inner liner tube has an inlet for inserting the core wire at its upstream end, allowing the core wire to be transported into the fixed inner liner tube. The core wire advances along the axis of the inner liner tube and is always located at the center of the inner liner tube. The inner liner tube has a feed inlet for powder to enter on its side wall. The inner liner tube has an air inlet between the feed inlet and the inlet. The air inlet of the inner liner tube is connected to an air pulse pump, allowing the powder to be transported into the annular cavity between the inner liner tube and the core wire. The strip steel is continuously formed into a covered tube along the inner liner tube at its downstream end, including: extruding the strip steel to bend it into a tubular shape along the inner liner tube. At the junction of the two edges of the welded strip, the strip is made into a cladding tube, which advances along the inner lining tube and is always connected to the inner lining tube. The core wire and powder enter the connected coating tube simultaneously from the inner liner tube. Under the impact of the air pulse, the powder is compacted in the inner cavity of the coating tube. To ensure that the powder is compacted in the coating tube, a powder-blocking part is provided at the head of the core wire. The powder-blocking part also includes an end cap fixed on the head of the coating tube. The end cap blocks the head of the coating tube and blocks the powder to compact it. The air pulse pump periodically sprays air. At the peak of the air pulse, the air forces the powder into the coating tube, filling the space between the core wire and the coating tube. The powder-blocking part further compacts the powder. At the trough of the air pulse, the air that was forced into the coating tube is discharged from the gap at the junction of the coating tube and the inner liner tube, completing the powder compaction of a section of the core wire.

2. The method for producing cored wire according to claim 1, characterized in that, Extruding the strip causes it to bend into a tubular shape along the inner liner, including overlapping the two edges of the strip.

3. The method for producing cored wire according to claim 1 or 2, characterized in that, Laser welding is used at the junction of the two edges of the welded strip.

4. The method for producing cored wire according to claim 1, characterized in that, Before welding the strip, flatten the junction of the two edges of the strip to form a pressure-pressed surface for the cladding tube.

5. The method for producing cored wire according to claim 1, characterized in that, The method further includes: winding the formed cored wire onto a rewinding wheel to hold the cored wire.

6. The method for producing cored wire according to claim 1, characterized in that, The method further includes: passivating the surface of the core wire and drying the passivation layer during core wire delivery.

7. The method for producing cored wire according to claim 1, characterized in that, The method further includes: before conveying the powder, the method further includes preparing the particles of each component according to the process ratio, and mixing the particles in a vacuum environment, wherein each type of particle contains only one component.

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