A milling cutter for processing a ladder slot of a rotor magnetic steel of a wind driven generator

Abstract

The present application relates to the technical field of milling cutter, in particular to a kind of wind-driven generator rotor magnetic steel ladder groove processing milling cutter, comprising: milling cutter disc, drive shaft and first conveying unit.The outer edge of milling cutter disc is provided with multiple groups of installation grooves, and each group of installation grooves is provided with cutting assembly. Among them, cutting assembly includes cutting edge, cutting edge has cutting surface, and cutting surface has cutting end for performing cutting action.When drive shaft drives milling cutter disc to rotate around its own axis, cutting end starts deep groove processing immediately.When cutting fluid in containing cavity flows into first flow channel, first conveying unit can guide cutting fluid to flow to cutting end stably, so that it can efficiently cool and lubricate cutting end and contact area with workpiece.Therefore, by the guidance of first conveying unit, the flow path of cutting fluid on cutting surface is extended, its residence time on cutting surface and cutting end is improved, efficient cooling and lubrication are realized, cutting temperature is significantly reduced, and the heating and wear of cutting edge are reduced.

Description

Technical Field

[0001] This invention relates to the field of milling cutter technology, and in particular to a milling cutter for machining the stepped grooves of wind turbine rotor magnets. Background Technology

[0002] As a core component of clean energy systems, wind turbines have seen increasing size and higher efficiency as major development trends in recent years. With the continuous increase in single-unit capacity, the size and structural complexity of the generator rotor have also increased accordingly. The fixing of the rotor magnets typically employs a stepped-slot structure. These stepped slots often have a large depth-to-width ratio, requiring extremely high machining accuracy and surface quality. The machining quality directly affects the installation stability of the magnets, the uniformity of the generator air gap, and the final energy conversion efficiency. Therefore, the machining of the rotor magnet stepped slots is one of the key processes in wind turbine manufacturing, posing a significant challenge to the performance of the machining tools used.

[0003] Currently, the machining of stepped slots in wind turbine rotor magnets largely relies on specialized slot end mills. Because magnets are typically hard and tough, they generate significant heat and tough chips during cutting. Especially during deep, continuous slotting, the cutting area forms a relatively enclosed space with the external environment. The cutting edge is in a nearly closed working environment, resulting in a long chip removal path that is difficult to clear quickly and completely. Chips tend to accumulate in the slot, forming a barrier layer that hinders coolant flow. Traditional slot end mills often use a single external spray or a simple axial flow channel design for coolant delivery, lacking precise guidance and making it difficult for the coolant to penetrate the accumulated chip layer and reach the cutting contact area between the cutting edge and the workpiece. Especially at greater cutting depths, the generated chips accumulate and block the machined surface between the cutting edge and the workpiece, forming a physical barrier that further impedes the coolant from reaching the cutting edge's cutting zone.

[0004] This phenomenon results in insufficient lubrication and cooling of the cutting edge during actual cutting. The large amount of heat generated by the cutting edge during high-speed cutting cannot be dissipated in time, accumulating at the cutting tip and in the workpiece cutting area. Sustained high temperatures not only exacerbate diffusion and oxidative wear of the cutting edge, leading to a significant reduction in cutting edge life, but may also cause localized thermal damage or work hardening of the workpiece material, increasing the frictional resistance between the cutting edge, workpiece, and chips, further intensifying cutting heat generation and cutting edge wear. Summary of the Invention

[0005] Therefore, it is necessary to provide a milling cutter for machining the stepped grooves of wind turbine rotor magnets, which addresses the problem that cutting fluid has difficulty entering the cutting zone of the cutting edge during the current slot milling process, leading to cutting edge heating and wear.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A milling cutter for machining the stepped grooves of wind turbine rotor magnets, comprising:

[0008] A milling cutter disc has multiple sets of mounting slots on its outer edge, which are circumferentially spaced around the central axis of the milling cutter disc. Each set of mounting slots contains a cutting assembly, which includes a mounting block and a cutting edge. The mounting block is connected to the milling cutter disc, and the cutting edge is fixedly connected to the mounting block. The cutting edge has a cutting surface with a cutting end for performing cutting actions.

[0009] A drive shaft is coaxially disposed inside the milling cutter disc and is used to drive the milling cutter disc to rotate around its own axis. A fluid reservoir is formed inside the drive shaft, and the fluid reservoir contains cutting fluid. An annular cavity is formed inside the milling cutter disc, and the annular cavity communicates with the fluid reservoir. Multiple sets of first flow channels are formed circumferentially on the milling cutter disc, each communicating with the annular cavity. Each set of first flow channels extends radially towards the mounting groove of the milling cutter disc.

[0010] First conveying unit;

[0011] The second delivery unit, both the first delivery unit and the second delivery unit are used to guide the flow of cutting fluid; when the first flow channel flows through the cutting fluid, the first delivery unit is used to guide the cutting fluid to the cutting end;

[0012] The first conveying unit includes a connecting pipe and multiple sets of grid bars. A connecting groove is provided on the mounting block, and the connecting groove communicates with the first flow channel. The connecting pipe is disposed in the connecting groove and the first flow channel, and the connecting pipe is used to flow cutting fluid. A connection port is provided on the mounting block, and the connecting pipe communicates with the connection port. A receiving cavity communicating with the connection port is provided on the cutting edge. Multiple sets of grid bars are spaced apart along the axial direction of the milling cutter disc and are fixedly disposed on the cutting surface. A flow groove is formed between adjacent grid bars, and the flow groove extends radially along the milling cutter disc and communicates with the receiving cavity.

[0013] Furthermore, adjacent cutting edges are alternately spaced in the radial direction of the milling cutter disc.

[0014] Furthermore, it also includes a cutting component for cutting off chips.

[0015] Furthermore, the cutting assembly includes a cutting blade, which is fixedly disposed on the cutting surface; the cutting blade has a cutting end, and when the chip moves to the cutting end, the second delivery unit is used to guide the cutting fluid to the cutting end.

[0016] Furthermore, the second conveying unit includes multiple sets of second flow channels, which are circumferentially distributed around the central axis of the milling cutter disc and communicate with the annular cavity; each set of mounting slots is provided with a spray pipe that communicates with one set of second flow channels, the spray pipe is fixedly connected to the milling cutter disc, and the opening of the spray pipe faces the side of the cutter away from the cutting end.

[0017] Furthermore, each set of second flow channels extends radially along the milling cutter disc.

[0018] Furthermore, a baffle is provided at the end of the mounting groove away from the cutting edge. The baffle is fixedly connected to the milling cutter disc and is used to restrict the flow of chips after cutting.

[0019] Furthermore, the cutting surface is inclined radially away from the injection pipe along the milling cutter disc.

[0020] Furthermore, the mounting block is detachably connected to the milling cutter disc.

[0021] The beneficial effects of this invention are:

[0022] This invention provides a milling cutter for machining stepped grooves in the magnets of a wind turbine rotor, comprising: a milling cutter disc, a drive shaft, and a first conveying unit. The drive shaft is coaxially disposed inside the milling cutter disc and is used to drive the milling cutter disc to rotate around its own axis. Multiple sets of mounting grooves are formed on the outer edge of the milling cutter disc, and these grooves are spaced circumferentially around the central axis of the milling cutter disc. Each set of mounting grooves contains a cutting assembly, which includes a mounting block and a cutting edge, with the mounting block fixedly connected to the cutting edge. The cutting edge has a cutting surface with a cutting end for performing cutting actions. A fluid reservoir is formed inside the drive shaft to contain cutting fluid, extending axially along the drive shaft. An annular cavity communicating with the fluid reservoir is formed inside the milling cutter disc, extending axially around the milling cutter disc. Furthermore, multiple sets of first flow channels communicating with the annular cavity are formed circumferentially on the milling cutter disc, each first flow channel extending radially towards the mounting groove. When the drive shaft drives the milling cutter disc to rotate around its own axis, the cutting end immediately begins deep groove machining. After the cutting fluid in the receiving cavity flows into the first flow channel, the first delivery unit guides the cutting fluid to flow steadily to the cutting end, enabling it to efficiently cool and lubricate the cutting end and the area in contact with the workpiece. Therefore, through the guidance of the first delivery unit, the flow path of the cutting fluid on the cutting surface is extended, increasing its residence time on the cutting surface and cutting end, achieving efficient cooling and lubrication, significantly reducing the cutting temperature, and reducing the heat and wear of the cutting edge. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a milling cutter for machining the stepped grooves of a wind turbine rotor magnet, provided in an embodiment of the present invention.

[0024] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0025] Figure 3 for Figure 1 A magnified view of a portion of point B in the middle;

[0026] Figure 4 for Figure 1 A magnified view of a portion of point C in the middle;

[0027] Figure 5 for Figure 1 The front view;

[0028] Figure 6 for Figure 5 Cross-sectional view along section AA;

[0029] Figure 7 for Figure 6 A magnified view of a portion of point D in the middle;

[0030] Figure 8 for Figure 1 Side view;

[0031] Figure 9 for Figure 8 A magnified view of a portion of point E in the middle;

[0032] Figure 10 for Figure 1 A schematic diagram of the cutting assembly.

[0033] in:

[0034] 100. Milling cutter head; 101. First flow channel; 102. Connecting flow channel; 103. Second flow channel; 104. Annular cavity; 110. Mounting slot; 111. Baffle;

[0035] 200, drive shaft; 201, liquid storage chamber; 202, port;

[0036] 300, Cutting assembly; 310, Mounting block; 311, Connecting groove; 312, Connecting port; 320, Cutting edge; 321, Cutting surface; 322, Cutting end; 330, Grating bar; 331, Flow channel; 340, Cutting cutter; 341, Cutting end; 350, Spray pipe. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0038] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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, and therefore should not be construed as limiting the invention.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] The following reference Figures 1 to 10 This invention describes a milling cutter for machining the trapezoidal slots of wind turbine rotor magnets. The milling cutter includes a cutter head 100 and a drive shaft 200. The cutter head 100 is mounted on a machine tool and coaxially fixed to the outside of the drive shaft 200. The machine tool provides power to the cutter head 100 via the drive shaft 200, driving the cutter head 100 to rotate around its own axial direction. Multiple sets of mounting slots 110 are formed on the outer edge of the cutter head 100, and these slots are circumferentially spaced around the central axis of the cutter head 100. Each mounting slot 110 contains a cutting assembly 300, which includes a mounting block 310 and a cutting edge 320. The mounting block 310 is fixedly connected to the cutter head 100, and the cutting edge 320 is fixedly connected to the mounting block 310. The cutting edge 320 has a cutting surface 321 that extends radially along the milling cutter head 100, and the cutting surface 321 has a cutting end 322 for performing cutting actions. When the milling cutter head 100 rotates about its own axis, that is... Figure 5 The counterclockwise rotation of the blade 320 causes the cutting edge 322 on the cutting surface 321 to perform cutting on the workpiece.

[0041] A fluid reservoir 201 is provided inside the drive shaft 200, extending axially along the drive shaft 200. An annular cavity 104 is provided inside the milling cutter disc 100, extending axially around the milling cutter disc 100. An opening 202 is provided inside the fluid reservoir 201, and the annular cavity 104 communicates with the fluid reservoir 201 through the opening 202. Furthermore, when a high-pressure cutting fluid is supplied to the fluid reservoir 201 by an external fluid delivery mechanism, the cutting fluid can flow into the annular cavity 104 through the opening 202. Multiple sets of first flow channels 101 are provided on the milling cutter disc 100, circumferentially spaced around the central axis of the milling cutter disc 100. Each set of first flow channels 101 extends radially towards the mounting groove 110 of the milling cutter disc 100. The milling cutter disc 100 has multiple sets of axially extending connecting channels 102 inside, each set of connecting channels 102 connecting to the annular cavity 104 and one of the first channels 101. Therefore, the cutting fluid in the annular cavity 104 can flow into the first channel 101 through the connecting channels 102.

[0042] Furthermore, the cutting assembly 300 also includes a first conveying unit, which includes a connecting pipe and multiple sets of grid bars 330. A connecting groove 311 communicating with the first flow channel 101 is provided on the mounting block 310, and a connecting port 312 is provided on the mounting block 310. The connecting pipe is installed in the first flow channel 101 and the connecting groove 311, with one end of the connecting pipe communicating with the connecting flow channel 102 and the other end communicating with the connecting port 312. A receiving cavity communicating with the connecting port 312 is provided on the cutting edge 320, allowing the cutting fluid in the annular cavity 104 to flow into the connecting pipe through the connecting flow channel 102, and then into the receiving cavity through the connecting port 312. Multiple sets of grid bars 330 are spaced apart along the axial direction of the milling cutter disc 100 and fixedly mounted on the cutting surface 321. A flow groove 331 is formed between adjacent grid bars 330, extending radially along the milling cutter disc 100 and communicating with the receiving cavity.

[0043] Specifically, as the milling cutter head 100 rotates around its own axis, the cutting end 322 immediately begins deep grooving. When the cutting fluid enters the receiving cavity, it is guided by multiple sets of flow channels 331 to flow stably to the cutting end 322, cooling and lubricating the cutting end 322 and the area in contact with the workpiece, effectively reducing cutting temperature and wear on the cutting edge 320. Furthermore, the multiple sets of flow channels 331 extend the flow path of the cutting fluid on the cutting surface 321, enhancing flow uniformity and preventing insufficient local cooling, thus ensuring sufficient cooling and lubrication of the cutting surface 321, further reducing heat generation and wear. In addition, the internally formed flow channels 331 provide stable guidance for the cutting fluid, preventing premature splashing due to centrifugal force during high-speed rotation, ensuring precise and continuous delivery of the cutting fluid to the cutting end 322, and maintaining sufficient residence time on the cutting surface 321 and the cutting end 322, further improving heat dissipation efficiency and lubrication effect.

[0044] In one example, adjacent cutting edges 320 are alternately spaced in the radial direction of the milling cutter head 100.

[0045] In one embodiment, the milling cutter for machining the stepped groove of the wind turbine rotor magnet also includes a cutting component for cutting off chips. Specifically, a large number of continuous, arc-shaped chips are easily generated during the cutting process. When the cutting end 322 is performing deep grooving, the arc-shaped chips generated by the cutting end 322 will accumulate due to the high-speed rotation of the milling cutter head 100. The end of the grid bar 330 near the cutting end 322 is inclined, which can lift the chips and guide them to quickly detach from the contact area between the cutting end 322 and the workpiece. As the milling cutter head 100 continues to rotate, the chips can roll towards the mounting groove 110 under the guidance of the grid bar 330 to avoid them being stuck between the cutting edge 320 and the workpiece, causing frictional wear. However, if the chips are too long, they may still wrap around or accumulate on the cutting surface 321, or even exceed the axial range of the mounting groove 110, and roll back to the machined surface, causing scratches and wear on the workpiece surface.

[0046] For this purpose, the cutting assembly includes a cutting blade 340, which is fixedly mounted on the cutting surface 321 and positioned near the end of the grid bar 330 away from the cutting end 322. The milling cutter for machining the magnetic stepped grooves of the wind turbine rotor also includes a second conveying unit. The second conveying unit includes multiple sets of second flow channels 103, which are circumferentially spaced around the central axis of the milling cutter disc 100 and all communicate with the annular cavity 104. Each set of second flow channels 103 extends radially along the milling cutter disc 100, and each mounting groove 110 contains a spray pipe 350 communicating with one of the second flow channels 103. The spray pipe 350 is fixedly connected to the milling cutter disc 100. The cutting blade 340 has a cut-off end 341, which extends radially along the milling cutter disc 100 towards the spray pipe 350, while the opening of the spray pipe 350 faces the side of the cutting blade 340 away from the cutting end 322. Therefore, when the chips are guided to the cut-off end 341 by the grid bar 330, the high-pressure cutting fluid in the annular cavity 104 flows into the second flow channel 103 and is sprayed onto the cut-off end 341 area through the spray pipe 350. This high-pressure cutting fluid applies an impact force to the chips in the opposite direction of chip curling, causing them to generate reverse bending stress. Furthermore, before the chips enter the mounting groove 110, the high-pressure cutting fluid cuts the chips passing through the cut-off end 341, thereby achieving segmented chip processing and effectively preventing long chips from wrapping around the cutting edge 320 or scraping the workpiece surface.

[0047] Meanwhile, the truncated short chips are easier to remove, further optimizing the heat dissipation and cleaning conditions in the deep groove enclosed environment, and ensuring the continuous and stable cutting capability of the 320 cutting edge.

[0048] It is understood that the receiving cavity is jointly formed by the cut-off blade 340 and the cutting edge 320, while the connecting port 312 is fixedly located on the side of the cut-off blade 340 near the connecting groove 311. Therefore, when cutting fluid flows into the receiving cavity, it can cool the cut-off blade 340, prevent the cut-off blade 340 from overheating, and help extend the service life of the cut-off blade 340.

[0049] In one embodiment, a baffle 111 is provided at the end of the mounting groove 110 away from the cutting edge 320, and the baffle 111 is fixedly connected to the milling cutter disc 100. Specifically, adjacent cutting edges 320 are symmetrically distributed radially on the milling cutter disc 100, and correspondingly, the baffles 111 in their respective mounting grooves 110 are also symmetrically arranged, ensuring that each mounting groove 110 has a baffle 111 on only one side, while the other side remains open. Therefore, the baffle 111 effectively prevents chips from contacting the workpiece surface during machining, avoiding surface scratches or marks caused by chip scraping, and improving machining quality. At the same time, when the milling cutter disc 100 rotates at high speed, completes a cutting stroke, and leaves the deep groove, the mounting groove 110 rotates out of the deep groove area with the milling cutter disc 100. Whenever the mounting slot 110 rotates out of the deep groove area with the milling cutter disc 100, under the action of centrifugal force and the cutting fluid sprayed from the spray pipe 350, the chips accumulated in the mounting slot 110 are quickly thrown out along the side without baffles 111, thus achieving automatic chip removal.

[0050] In one embodiment, the cutting surface 321 is inclined radially away from the injection pipe 350 along the milling cutter head 100, such as... Figure 9 As shown. Specifically, during the deep groove machining process, the inclined cutting surface 321 forms a guiding slope, which tends to guide the chips into the mounting groove 110 and towards the side where the baffle 111 is provided. This effectively prevents the chips from deviating to the machined surface area of ​​the workpiece, thereby reducing the probability of contact between the chips and the workpiece, ensuring the machining quality of the workpiece, and improving the service life of the cutting edge 320.

[0051] In one embodiment, the mounting block 310 is detachably connected to the milling cutter head 100. Specifically, when faced with deep groove machining tasks of different specifications, the detachable structure allows for the replacement of the mounting block 310, and thus the replacement of the cutting edge 320 with different specifications, thereby flexibly adapting to different cutting conditions. Simultaneously, when the cutting edge 320 wears out after prolonged use and needs replacement, the detachable structure allows for the replacement of only the damaged mounting block 310, thereby replacing the cutting edge 320, significantly reducing usage costs and maintenance cycles.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A milling cutter for machining the stepped grooves of a wind turbine rotor magnet, characterized in that, include: A milling cutter disc has multiple sets of mounting slots on its outer edge, which are circumferentially spaced around the central axis of the milling cutter disc. Each set of mounting slots contains a cutting assembly, which includes a mounting block and a cutting edge. The mounting block is connected to the milling cutter disc, and the cutting edge is fixedly connected to the mounting block. The cutting edge has a cutting surface with a cutting end for performing cutting actions. A drive shaft is coaxially disposed inside the milling cutter disc and is used to drive the milling cutter disc to rotate around its own axis. A fluid reservoir is formed inside the drive shaft, and the fluid reservoir contains cutting fluid. An annular cavity is formed inside the milling cutter disc, and the annular cavity communicates with the fluid reservoir. Multiple sets of first flow channels are formed circumferentially on the milling cutter disc, each communicating with the annular cavity. Each set of first flow channels extends radially towards the mounting groove of the milling cutter disc. First conveying unit; The second delivery unit, both the first delivery unit and the second delivery unit are used to guide the flow of cutting fluid; when the first flow channel flows through the cutting fluid, the first delivery unit is used to guide the cutting fluid to the cutting end; The first conveying unit includes a connecting pipe and multiple sets of grid bars. A connecting groove is provided on the mounting block, and the connecting groove communicates with the first flow channel. The connecting pipe is disposed in the connecting groove and the first flow channel, and the connecting pipe is used to flow cutting fluid. A connection port is provided on the mounting block, and the connecting pipe communicates with the connection port. A receiving cavity communicating with the connection port is provided on the cutting edge. Multiple sets of grid bars are spaced apart along the axial direction of the milling cutter disc and are fixedly disposed on the cutting surface. A flow groove is formed between adjacent grid bars, and the flow groove extends radially along the milling cutter disc and communicates with the receiving cavity.

2. The milling cutter for machining the stepped grooves of the wind turbine rotor magnet according to claim 1, characterized in that, The adjacent cutting edges are alternately spaced in the radial direction of the milling cutter head.

3. The milling cutter for machining the stepped grooves of the wind turbine rotor magnet according to claim 1, characterized in that, It also includes a cutting component for cutting off chips.

4. The milling cutter for machining the stepped grooves of the wind turbine rotor magnet according to claim 3, characterized in that, The cutting assembly includes a cutting blade, which is fixedly disposed on the cutting surface; the cutting blade has a cutting end, and when the chip moves to the cutting end, the second delivery unit is used to guide the cutting fluid to the cutting end.

5. The milling cutter for machining the stepped grooves of the wind turbine rotor magnet according to claim 4, characterized in that, The second conveying unit includes multiple sets of second flow channels, which are circumferentially distributed around the central axis of the milling cutter disc and communicate with the annular cavity; each set of mounting slots is provided with a spray pipe that communicates with one set of second flow channels, the spray pipe is fixedly connected to the milling cutter disc, and the opening of the spray pipe faces the side of the cutter away from the cutting end.

6. The milling cutter for machining the stepped grooves of the wind turbine rotor magnet according to claim 5, characterized in that, Each group of second flow channels extends radially along the milling cutter disc.

7. The milling cutter for machining the stepped grooves of the wind turbine rotor magnet according to claim 3, characterized in that, A baffle is provided at the end of the mounting groove away from the cutting edge. The baffle is fixedly connected to the milling cutter disc and is used to restrict the flow of chips after cutting.

8. The milling cutter for machining the stepped grooves of the wind turbine rotor magnet according to claim 5, characterized in that, The cutting surface is inclined radially away from the injection pipe along the milling cutter disc.

9. The milling cutter for machining the stepped grooves of the wind turbine rotor magnet according to claim 1, characterized in that, The mounting block is detachably connected to the milling cutter head.

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