Impeller machining method, impeller and cross-flow fan

Abstract

The application provides a method for processing an impeller, the impeller and a cross-flow fan. The cross-flow fan comprises the impeller, and the impeller is manufactured by the method for processing the impeller. The method for processing the impeller comprises the following steps: providing a blank to be processed; removing material from the periphery of the blank to be processed by a turning process to expose a support ring; and removing material from the blank to be processed after the turning process by a milling process to form blades and the support ring. The application combines the turning process and the milling process to process the impeller. The turning process can quickly expose the support ring, improve the forming efficiency, and then the milling process can remove material to excavate blade grooves to form the blades, improve the structural rigidity and strength of the whole impeller, reduce the runout of the impeller under high-speed rotation, reduce the overall vibration of the cross-flow fan, and make the working stability of the cross-flow fan good.

Description

Technical Field

[0001] This application belongs to the field of crossflow fan technology, and more specifically, relates to an impeller processing method, an impeller, and a crossflow fan. Background Technology

[0002] The impeller is an important component of a crossflow fan. Existing crossflow fan impellers are generally manufactured in the following way: the alloy material is stretched to a specified length using a stretching die, and then part of the surface of the alloy material is removed by a lathe to expose the blade structure. The spaced parts of the alloy material are used as reinforcing ribs. The above manufacturing method results in a weak overall structural strength and rigidity of the impeller, which leads to large impeller runout under high-speed rotation, causing overall vibration and poor stability of the crossflow fan. Summary of the Invention

[0003] The purpose of this application is to provide an impeller processing method, an impeller, and a crossflow fan to solve the technical problem of weak impeller strength and rigidity in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: Firstly, a method for processing an impeller is provided, comprising the following steps: Provide raw blanks to be processed; Material is removed from the outer periphery of the blank to be processed by turning to expose the support ring; The blank to be processed is removed by milling to form blades and support rings.

[0005] In some embodiments, the blank to be processed includes a blank ring and a plurality of blade inner ends. The blank ring is cylindrical, and the inner ends of each blade are distributed circumferentially at intervals on the inner wall surface of the blank ring. Both the turning process and the milling process are used to process the blank ring.

[0006] In some embodiments, removing material from the outer periphery of the workpiece by turning to expose the support ring includes the following steps: The first thickness of material is removed from the outer periphery of the blank ring by a turning process to expose the first cylindrical surface; By using a turning process, the second thickness material is removed intermittently from the first cylindrical surface to expose a plurality of second cylindrical surfaces spaced apart along the axial direction, and to expose the outer ends of a plurality of support rings spaced apart along the axial direction.

[0007] In some embodiments, the step of removing material from the blank to be machined by milling to form blades and support rings includes: on the second cylindrical surface, removing material between the outer ends of adjacent support rings and between the inner ends of two adjacent blades to expose the outer ends of the blades and the inner ends of the support rings, wherein the inner ends of the blades and the outer ends of the blades together form blades, and the inner ends of the support rings and the outer ends of the support rings together form support rings.

[0008] In some embodiments, the outer end of the blade is provided to have a third thickness along the radial direction of the blank ring, and the third thickness is less than the first thickness and the second thickness.

[0009] In some embodiments, based on each of the second cylindrical surfaces, the outer end of the blade and the inner end of the support ring are exposed by multiple milling steps, with each milling step removing a layer of material radially along the blank ring.

[0010] In some embodiments, the blank to be processed includes a substrate and shaft heads connected to opposite ends of the substrate. The blank to be processed is mounted on a lathe and a milling machine via the two shaft heads. The substrate includes the blank ring and the inner end of the blade.

[0011] In some embodiments, the substrate is formed by stretching an alloy material to a predetermined length.

[0012] Secondly, this application also provides an impeller manufactured by the above-described impeller processing method.

[0013] Thirdly, this application also provides a crossflow fan, including the aforementioned impeller.

[0014] The beneficial effects of the impeller processing method, impeller, and crossflow fan provided in this application are as follows: the impeller is processed by a combination of turning and milling processes. The turning process can quickly expose the support ring, improving the processing efficiency. Then, the milling process removes material to carve out blade grooves to form blades. This process does not remove all material outside the inner end of the blades, thereby reducing material loss, improving the structural rigidity and strength of the entire impeller, reducing impeller vibration under high-speed rotation, reducing the overall vibration of the crossflow fan, and making the crossflow fan have good working stability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1This is a schematic flowchart of the impeller machining method provided in an embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the side structure of the blank to be processed provided in an embodiment of this application.

[0018] Figure 3 This is a cross-sectional view of the blank to be processed provided in an embodiment of this application.

[0019] Figure 4 This is a schematic diagram of the side structure of the blank to be processed after the first turning process, as provided in the embodiments of this application.

[0020] Figure 5 This is a cross-sectional view of the blank to be processed after the first turning process, as provided in the embodiments of this application.

[0021] Figure 6 This is a schematic diagram of the side structure of the blank to be processed after the second turning process, as provided in the embodiments of this application.

[0022] Figure 7 This is a cross-sectional view of the blank to be processed after a second turning process, as provided in the embodiments of this application.

[0023] Figure 8 This is a side view of the impeller after the blank to be processed, provided in an embodiment of this application.

[0024] Figure 9 This is a schematic diagram of the structure of a partial blade and a partial support ring in a blade provided in an embodiment of this application.

[0025] The following are the labeling elements in the figure: 100. Blank to be processed; 110. Substrate; 111. Blank ring; 112. Inner end of blade; 113. First cylindrical surface; 114. Second cylindrical surface; 115. Third cylindrical surface; 116. Fourth cylindrical surface; 117. Outer end of blade; 118. Outer end of support ring; 119. Inner end of support ring; 120. Shaft head; 130. End cap; 140. Blade; 150. Support ring; 160. Impeller body; 170. Blade groove; 1. Impeller. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0028] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and 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 this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0030] As described in the background art, the impellers of existing crossflow fans are generally processed in the following way: the alloy material is stretched to a specified length using a stretching die, and then part of the surface of the alloy material is removed by a lathe to expose the blade structure. The part of the alloy material left at the intervals serves as a reinforcing rib. The above processing method results in a weak overall structural strength and rigidity of the impeller, which leads to large impeller runout under high-speed rotation, causing the crossflow fan to vibrate as a whole and have poor stability.

[0031] To solve the above-mentioned technical problems, this application provides an impeller processing method, an impeller 1, and a crossflow fan. By changing the processing method of the impeller 1, the rigidity and strength of the impeller 1 are enhanced after processing, reducing the jumping of the impeller 1 under high-speed rotation, reducing the overall vibration of the crossflow fan, and making the working stability of the crossflow fan better.

[0032] Please refer to the following: Figures 1 to 8 The impeller processing method provided in the embodiments of this application will now be described.

[0033] The impeller machining method includes the following steps: S10: Provide 100 blanks to be processed; The outer wall surface of the blank 100 to be processed is roughly cylindrical to facilitate subsequent processing. The blank 100 to be processed is hollow, and the inner wall of the blank 100 to be processed has at least a portion of the blade inner end 112.

[0034] S20: Remove material from the outer periphery of the blank 100 to expose the support ring 150 by turning process; Specifically, the two axial ends of the blank 100 to be processed are fixed on the spindle chuck of the lathe, and the cutting tool of the lathe is positioned on one side of the blank 100. The spindle of the lathe rotates the blank 100 to remove material from the outer periphery of the blank 100 to expose the support ring 150.

[0035] It should be noted that when we say "exposed support ring 150," we mean that the outer end 118 of the support ring 150 protrudes from the blade 140. Please refer to [link / reference needed]. Figure 6 and Figure 7 Let the outer circumferential surface of the support ring 150 be the first cylindrical surface 113, and the outer circumferential surface for forming the blade 140 be the second cylindrical surface 114. Then the first outer diameter D1 of the first cylindrical surface 113 is greater than the second outer diameter D2 of the second cylindrical surface 114. When there are multiple support rings 150, the outer end 118 of each support ring protrudes from the second cylindrical surface 114, and the outer ends 118 of each support ring are spaced apart along the axial direction of the impeller 1.

[0036] S30: The blank 100 to be processed by the turning process is removed by milling to form the blade 140 and the support ring 150.

[0037] Specifically, the milling cutter of the milling machine is mounted on a three-axis mechanism, and the blank 100 to be processed is mounted on the fourth axis. The three-axis mechanism drives the milling cutter to move along the X-axis, Y-axis and Z-axis respectively, and can also drive the milling cutter to rotate around the Z-axis, so as to remove material from the blank 100 to expose the blade 140 and the support ring 150. The fourth axis can also rotate the blank 100 to allow the milling cutter to process different blades 140 in one circumference.

[0038] The impeller machining method provided in this application combines turning and milling processes to machine the impeller 1. The turning process can quickly expose the support ring 150, improving the machining efficiency. Then, the milling process removes material to carve out the blade groove 170 to form the blade 140. The material outside the inner end 112 of the blade is not removed, thereby reducing material loss, improving the structural rigidity and strength of the entire impeller 1, reducing the vibration of the impeller 1 under high-speed rotation, reducing the overall vibration of the crossflow fan, and making the crossflow fan have good working stability.

[0039] In some embodiments, please refer to Figure 3The blank 100 to be processed includes a blank ring 111 and multiple blade inner ends 112. The blank ring 111 is cylindrical, and the blade inner ends 112 are distributed circumferentially on the inner wall surface of the blank ring 111. Turning and milling processes are used to process the blank ring 111 to form blades 140 and support rings 150.

[0040] It should be noted that there are multiple inner ends 112 of the blades. Preferably, each inner end 112 of the blades is distributed at equal intervals along the circumference of the blank ring 111 on the inner wall surface of the blank ring 111. The radial cross section of the inner end 112 of the blades is arc-shaped. Each inner end 112 of the blades extends along the axial direction of the blank ring 111. The two end faces of each inner end 112 of the blades along the axial direction of the blank ring 111 are respectively flush with the two end faces of the blank ring 111 along the axial direction. Each inner end 112 of the blades and the blank ring 111 are integrally formed.

[0041] During turning, rapidly remove material from the outer circumferential surface of the blank ring 111 to expose the outer end 118 of the support ring; for milling, please refer to [the relevant documentation]. Figure 8 and Figure 9 After turning, material is further removed from the blank ring 111. Specifically, material is removed between the outer ends 118 of adjacent support rings and between the inner ends 112 of two adjacent blades to form a blade groove 170. The material left at the position of the blank ring 111 corresponding to the inner end 112 of the blade is the outer end 117 of the blade. The inner end 112 and the outer end 117 of the blade together form a complete blade 140. However, if the turning process is used entirely, only the material of the portion of the blank ring 111 corresponding to the inner end 112 of the blade can be completely removed to expose the inner end 112 of the blade and form the blade 140. That is, the inner end 112 of the blade is the final formed blade 140. Compared with the blade 140 formed by the inner end 112 and the outer end 117 of the blade in this application, the blade 140 after the turning and milling processes in this application has more stable structural strength, that is, the structural strength and rigidity of the entire blade 140 are better.

[0042] In some embodiments, S20: removing material from the outer periphery of the blank 100 to expose the support ring 150 by a turning process includes the following steps: S21: Remove the first thickness material from one circumference of the blank ring 111 by turning process to expose the first cylindrical surface 113; For details, please refer to Figures 2 to 5 The initial state of the outer surface of the blank ring 111 is a third cylindrical surface 115. The first turning process first removes the first thickness of material from the entire surface of the third cylindrical surface 115 to expose a first cylindrical surface 113 that extends continuously along the axial direction. The third cylindrical surface 115 has a third outer diameter D3, the first cylindrical surface 113 has a first outer diameter D1, and the first thickness is h1, so D3-D1=2h1.

[0043] During turning, since both the third cylindrical surface 115 and the first cylindrical surface 113 are cylindrical surfaces that extend continuously upward along the axial direction, they can be turned quickly by turning the entire surface, resulting in high processing efficiency and high processing accuracy.

[0044] S22: By turning, the second thickness material is removed intermittently on the first cylindrical surface 113 to expose a plurality of second cylindrical surfaces 114 spaced apart along the axial direction, and to expose a plurality of outer ends 118 of support rings spaced apart along the axial direction.

[0045] For details, please refer to Figure 6 and Figure 8 Based on the first cylindrical surface 113, material of the first preset length and the second thickness is removed at preset distances along the axial direction to expose a plurality of second cylindrical surfaces 114 spaced apart along the axial direction. The material left in the blank ring 111 between each second cylindrical surface 114 and the first cylindrical surface 113 is the outer end 118 of the plurality of support rings, that is, to expose each support ring 150.

[0046] In this embodiment, two turning process steps, S21 and S22, are set. The setting of step S21 makes the first cylindrical surface 113 of the support ring 150 have high smoothness and precision. It can be understood that in other embodiments of this application, only one turning process can be set, and the material can be removed at intervals on the third cylindrical surface 115 to expose a plurality of second cylindrical surfaces 114 arranged at intervals along the axial direction, and to expose a plurality of outer ends 118 of the support ring arranged at intervals along the axial direction. This is not the only one.

[0047] In step S22, since the first preset length of the multiple second cylindrical surfaces 114 is much greater than the axial length of the support ring 150, machining by turning can improve machining efficiency.

[0048] Optionally, in step S21, the removal of the first thickness material can be divided into several turning steps. For example, the first step is to turn away the first dimension at the first speed, the second step is to turn away the second dimension at the second speed, the third step is to turn away the third dimension at the third speed, and so on. The sum of each dimension is the first thickness value. The first speed, the second speed, and the third speed can be equal or unequal. The first step, the second step, and the third step can also be divided into roughing and finishing. As long as the first thickness material can be removed by turning process, it is acceptable.

[0049] Optionally, in step S22, the removal of the second thickness material can also be carried out in several turning steps. The turning speed of each turning step can be equal or unequal, and it can also be divided into roughing and finishing.

[0050] In some embodiments, please refer to Figure 8 and Figure 9 Step S30: Removing material from the blank 100 to be processed by turning through milling process to form blade 140 and support ring 150 includes the following steps: Based on the second cylindrical surface 114, removing material between the outer ends 118 of adjacent support rings and between the inner ends 112 of two adjacent blades to expose the outer ends 117 of blades and the inner ends 119 of support rings. The inner ends 112 and the outer ends 117 of blades together form blade 140, and the inner ends 119 and the outer ends 118 of support rings together form support ring 150.

[0051] For details, please refer to Figure 9 Let the inner wall surface of the blank ring 111 be the fourth cylindrical surface 116. Then, the portion between the fourth cylindrical surface 116 and the second cylindrical surface 114, corresponding to the inner end 112 of the blade, is the outer end 117 of the blade. The inner end 112 and the outer end 117 of the blade together form the blade 140. The portion between the fourth cylindrical surface 116 and the second cylindrical surface 114, corresponding to the outer end 118 of the support ring, is the inner end 119 of the support ring. The outer end 118 and the inner end 119 of the support ring together form the support ring 150. In addition, the inner end 112 of the blade located inside the support ring 150 is used to connect adjacent blades 140. Adjacent blades 140 and the support ring 150 are connected axially by the outer end 117 of the blade and the inner end 119 of the support ring. Compared with the turning process, which cannot form the outer end 117 of the blade, this increases the structural strength and rigidity of the entire impeller 1.

[0052] In this embodiment, the outer end 117 of the blade has a third thickness h3 along the radial direction of the blank ring 111. The third thickness h3 is smaller than the first thickness h1 and the second thickness h2. In this embodiment, most of the thickness (first thickness h1 and second thickness h2) of the blank ring 111 is removed by turning process to improve processing efficiency. Then, a small part of the material is removed by milling process to expose the outer end 117 of the blade and the inner end 119 of the support ring. The connection between the outer end 117 of the blade and the inner end 119 of the support ring improves the structural strength and rigidity of the entire blade 140, reduces the milling difficulty, and improves the milling efficiency.

[0053] In some embodiments, based on each second cylindrical surface 114, the outer end 117 of the blade and the inner end 119 of the support ring are exposed through multiple milling steps, with each milling step removing one layer of material radially along the blank ring 111. In this embodiment, layered milling reduces milling difficulty, minimizes tool breakage, and improves milling accuracy. It is understood that in other embodiments of this application, when the thickness to be milled is low, layered milling may not be necessary, and this is not a limiting factor.

[0054] Optionally, when step S30 involves multiple milling operations, it can be divided into rough milling and finish milling. During rough milling, a large amount of material can be removed by using an extended end mill or a corn milling cutter. During finish milling, a ball end mill / formed arc end mill can be used to match the 140° curved surface of the blade for fine milling.

[0055] In some embodiments, please refer to Figure 2 and Figure 3 The blank 100 to be processed includes a base material 110 and shaft heads 120 connected to opposite ends of the base material 110. The blank 100 to be processed is mounted on a lathe and a milling machine via the two shaft heads 120. The base material 110 includes a blank ring 111 and an inner end 112 of a blade. In this embodiment, by connecting shaft heads 120 to opposite ends of the base material 110 before processing, it is convenient to mount the blank 100 to be processed on the lathe and the milling machine. The lathe and the milling machine can drive the base material 110 to rotate via the shaft heads 120 to achieve full processing of the base material 110.

[0056] Optionally, the substrate 110 is formed by stretching an alloy material to a preset length. The stretching process has the advantages of high dimensional accuracy, good surface finish, good mechanical properties, material saving, and high forming efficiency. It is understood that in other embodiments of this application, the substrate 110 can also be formed by machining, and this is not the only possible method.

[0057] Optionally, one end of the shaft head 120 is connected to an end cap 130, which is attached to the outer end face of the substrate 110 and welded to the substrate 110 to achieve the connection between the shaft head 120 and the substrate 110.

[0058] Optionally, the end cap 130 and the substrate 110 are made of the same material, so that the end cap 130 and the cylindrical substrate have the same coefficient of thermal expansion. Even in high-temperature environments, the end cap 130 and the substrate are not easily separated, thereby ensuring the welding stability between the end cap 130 and the substrate 110. In addition, during the first turning process, the outer peripheral surface of the end cap 130 and the outer peripheral surface of the substrate 110 can be turned together, so that the turned end cap 130 is flush with the substrate 110.

[0059] Optionally, both the end cap 130 and the substrate 110 can be made of aluminum. It is understood that in other embodiments of this application, the substrate 110 and the end cap 130 can also be made of other materials, such as aluminum alloy or engineering plastics, and are not limited to these materials here.

[0060] Optionally, the shaft head 120 and the end cap 130 are welded together. The shaft head 120 is made of SUS304 austenitic stainless steel. Austenitic stainless steel not only has high hardness but also can operate in high-temperature environments, such as at 200°C, while maintaining high structural hardness and strength. It is understood that in other embodiments of this application, the shaft head 120 may also be made of other materials with high hardness, such as low-alloy heat-resistant steel or copper alloys.

[0061] Secondly, this application also provides an impeller 1, manufactured by the aforementioned impeller processing method. The impeller 1 provided in this application embodiment, manufactured by the aforementioned impeller processing method, has better structural strength and rigidity, reduces the vibration of the impeller 1 under high-speed rotation, reduces the overall vibration of the crossflow fan, and improves the working stability of the crossflow fan.

[0062] For details, please refer to Figure 8 The impeller 1 includes a shaft head 120 and an impeller body 160. The impeller body 160 includes a support ring 150 and blades 140. There are multiple blades 140, which are evenly distributed along the circumference. There are multiple support rings 150, which are spaced apart along the axial direction. Each support ring 150 is used to connect the blades 140 into a whole. The shaft head 120 is welded to the support rings 150 located at both ends of each blade 140.

[0063] Please refer to Figure 9 The support ring 150 includes an outer end 118 and an inner end 119, and the blade 140 includes an outer end 117 and an inner end 112.

[0064] Optionally, the support rings 150 located at both ends of each blade 140 have a first axial length L1, and each support ring 150 located between the two end support rings 150 has a second axial length L2, wherein the first axial length L1 is greater than the second axial length L2.

[0065] Optionally, the shaft head 120 is connected to the end cover 130, and the end cover 130 is welded to the support rings 150 located at both ends of each blade 140.

[0066] Thirdly, this application also provides a crossflow fan, including the impeller 1 described above. The crossflow fan provided in this application, through the design of the impeller 1, can reduce the overall vibration of the crossflow fan, resulting in good operational stability.

[0067] In this embodiment, the crossflow fan may further include a rotary drive, a volute, and two mounting bases. The two mounting bases are axially opposite and spaced apart. An impeller 1 is disposed between the two mounting bases, with its opposite ends rotatably mounted on the two mounting bases via two shaft heads 120. The rotary drive is mounted outside one of the mounting bases and connected to one of the shaft heads 120 to drive the impeller 1 to rotate. The volute is fitted over the impeller 1, with its opposite ends mounted on the two mounting bases. Different sides of the volute have an air inlet and an air outlet. When the rotary drive drives the impeller 1 to rotate, each blade 140 disturbs the surrounding air, allowing external air to enter the crossflow fan from the air inlet and flow out from the air outlet to blow onto the structure to be blew.

[0068] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method of machining an impeller, characterized by, Includes the following steps: Provide raw blanks to be processed; Material is removed from the outer periphery of the blank to be processed by turning to expose the support ring; The blank to be processed is removed by milling to form blades and support rings.

2. The impeller machining method according to claim 1, wherein The blank to be processed includes a blank ring and multiple inner ends of blades. The blank ring is cylindrical, and the inner ends of each blade are distributed circumferentially on the inner wall surface of the blank ring. The turning process and the milling process are both used to process the blank ring.

3. The impeller machining method according to claim 2, wherein The process of removing material from the outer periphery of the blank to expose the support ring by turning includes the following steps: The first thickness of material is removed from the outer periphery of the blank ring by a turning process to expose the first cylindrical surface; By using a turning process, the second thickness material is removed intermittently from the first cylindrical surface to expose a plurality of second cylindrical surfaces spaced apart along the axial direction, and to expose the outer ends of a plurality of support rings spaced apart along the axial direction.

4. The impeller machining method as described in claim 3, characterized in that, The process of removing material from the blank to be processed by turning through milling to form blades and support rings includes: on the basis of the second cylindrical surface, removing material between the outer ends of adjacent support rings and between the inner ends of two adjacent blades to expose the outer ends of the blades and the inner ends of the support rings, wherein the inner ends of the blades and the outer ends of the blades together form blades, and the inner ends of the support rings and the outer ends of the support rings together form support rings.

5. The impeller machining method as described in claim 4, characterized in that, If the outer end of the blade has a third thickness along the radial direction of the blank ring, then the third thickness is less than the first thickness and the second thickness.

6. The impeller machining method as described in claim 4, characterized in that, Based on each of the second cylindrical surfaces, the outer end of the blade and the inner end of the support ring are exposed through multiple milling steps, with each milling step removing a layer of material along the radial direction of the blank ring.

7. The impeller machining method as described in claim 4, characterized in that, The blank to be processed includes a base material and shaft heads connected to opposite ends of the base material. The blank to be processed is mounted on a lathe and a milling machine via the two shaft heads. The base material includes the blank ring and the inner end of the blade.

8. The impeller machining method as described in claim 7, characterized in that, The substrate is formed by stretching an alloy material to a preset length.

9. An impeller, characterized in that, It is manufactured by the impeller machining method as described in any one of claims 1 to 8.

10. A crossflow fan, characterized in that, Includes the impeller as described in claim 9.

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