Curved surface machining cutter

Abstract

The utility model relates to a curved surface machining cutter which is used for machining a special-shaped curved surface, the special-shaped curved surface is formed by smoothly connecting a plurality of first curve sections which are arranged at intervals, the cutter comprises a plurality of cutting edges which are evenly arranged around the axis of the cutter at intervals and are the same in structure, and the contour line of each cutting edge is formed by fitting a plurality of second curve sections, and each first curve section is matched with one second curve section. According to the special-shaped curved surface cutter, the machining efficiency is improved, the machined special-shaped curved surface cutter lines are light, the surface effect is good, and the follow-up grinding yield is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a curved surface processing tool. Background Art

[0002] With the continuous development of society and the continuous improvement of science and technology, the outer contours of various electronic products have gradually been upgraded to metal shells with better texture. The outer contours of many metal shells are irregular curved surfaces, and the appearance requirements are high.

[0003] Due to the complex shape of special-shaped curved surfaces, three-axis CNC machine tools are often used in conjunction with ball cutters to perform point cutting. However, point cutting not only has low processing efficiency, but also produces products with heavy knife marks, poor surface effects, and low grinding yield. Summary of the invention

[0004] Based on this, the utility model provides a curved surface processing tool for processing special-shaped curved surfaces, wherein the special-shaped curved surface is formed by smoothly connecting a plurality of first curved segments arranged at intervals, the tool comprises a plurality of blades that are evenly spaced around the tool axis and have the same structure, the contour line of the blade is fitted by a plurality of second curved segments, wherein each of the first curved segments coincides with one of the second curved segments.

[0005] Furthermore, the tool comprises a cutting portion and a clamping portion coaxially formed on the top of the cutting portion, and a plurality of chip removal grooves are provided on the cutting portion to form the plurality of cutting edges.

[0006] Furthermore, the cutting portion and the clamping portion are integrally formed.

[0007] Furthermore, the diameter of the cutting portion first gradually decreases and then gradually increases in a direction away from the clamping portion.

[0008] Furthermore, the diameter of the top of the cutting portion is greater than the diameter of the clamping portion.

[0009] Furthermore, the plurality of chip removal grooves are evenly spaced around the axis of the tool and have the same structure.

[0010] Furthermore, each of the chip removal grooves extends from the bottom of the cutting portion to the clamping portion.

[0011] Furthermore, each of the second curve segments coincides with at least one of the first curve segments.

[0012] Furthermore, the axis of the tool is parallel to the Z axis.

[0013] Furthermore, the number of the blades is 2 to 5.

[0014] Compared with the prior art, the beneficial features of the utility model are: the curved surface processing tool can be used to process special-shaped curved surfaces, which are formed by smoothly connecting multiple first curved segments arranged at intervals. The tool includes multiple blades with the same structure and evenly arranged around the tool axis. During processing, the contour line of the blade contacts the product line being processed. The contour line of the blade is fitted by multiple second curved segments, wherein each first curved segment coincides with a second curved segment. Not only can the special-shaped curved surface be formed in one step, thereby improving the processing efficiency, but the special-shaped curved surface obtained by processing has light knife marks and good surface effect, thereby improving the subsequent grinding yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the contour structure of the curved surface machining tool of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the curved surface machining tool of the utility model;

[0017] Figure 3 for Figure 2 AA section view of the surface machining tool shown;

[0018] Figure 4 This is a schematic diagram of the structure of the curved surface machining tool of the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the second workpiece in the curved surface machining tool of the utility model;

[0020] Figure 6 for Figure 5 A schematic diagram of a projection of the second workpiece on the XY plane is shown;

[0021] Figure 7 for Figure 5 A schematic diagram of a cross-sectional structure of a second workpiece shown;

[0022] Figure 8 for Figure 5 A schematic diagram of a cross-sectional structure of a second workpiece shown;

[0023] Fig. 9 for Figure 5 A schematic diagram of a cross-sectional structure of a second workpiece shown;

[0024] Fig.10 for Figure 5 The first curve segment fitting schematic diagram of the second workpiece shown;

[0025] Fig.11 It is a schematic diagram of the center axis and blade contour line of the curved surface machining tool of the utility model;

[0026] Fig.12 for Fig.11The schematic diagram of the profile structure of the cutting part of the surface machining tool shown;

[0027] Fig.13 for Fig.11 The structural schematic diagram of the surface machining tool shown;

[0028] Fig.14 for Fig.13 Tool processing shown Figure 5 The schematic diagram of tool movement for the second workpiece shown;

[0029] Fig.15 for Fig.13 Tool processing shown Figure 5 The schematic diagram of tool movement for the second workpiece shown;

[0030] Fig.16 for Fig.13 Tool processing shown Figure 5 The schematic diagram of tool movement for the second workpiece shown;

[0031] Among them: 100-tool (100a-tool, 100b-tool, 100c-tool, 110-cutting part (111-blade, 112-chip groove), 120-clamping part, 130-axis line, 140-contour line (141-second curve segment, 142-second curve segment, 143-second curve segment), H-minimum distance between the center axis of the tool and the contour line of the blade), 200-second workpiece (210-molding surface (211-molding surface segment, 212-molding surface segment, 213-molding surface segment, 214-molding surface segment), 220a-first curve segment, 220b-first curve segment, 220c-first curve segment, 220d-first curve segment, 230-third curve segment, 240a-section, 240b-section, 240c-section, 240d-section). DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0035] Please refer to Figures 1 to 16 The curved surface machining tool 100 of the utility model embodiment can be used to machine the machining area of ​​the first workpiece to form a molding surface 210 to obtain a second workpiece 200, wherein the molding surface 210 can be a special-shaped curved surface. Please refer to Figure 5 The forming surface 210 is formed by smoothly connecting a plurality of first curve segments arranged at intervals. The tool 100 includes a plurality of blades 111. All blades 111 are evenly spaced around the axis 130 of the tool 100, and all blades 111 have the same structure. The contour line 140 of the blade 111 is fitted by a plurality of second curve segments, and each first curve segment is matched with a second curve segment.

[0036] The curved surface machining tool 100 of the embodiment of the utility model rotates around the axis 130 of the tool 100 during machining, and the tool 100 moves relative to the first workpiece in the machining area of ​​the first workpiece to machine the machining area to form a molding surface 210. During machining, the contour line 140 of the blade 111 is in line contact with the first workpiece being machined, and the contour line 140 of the blade 111 is fitted by a plurality of second curve segments, wherein each first curve segment is matched with a second curve segment, not only can the second workpiece 200 with the molding surface 210 be obtained in one molding, thereby improving machining efficiency, but also the molded surface 210 obtained by machining has light knife marks and good surface effect, and also improves the subsequent grinding yield, and also increases the service life of the tool 100, and reduces the cost of the tool 100.

[0037] As an example, the molding surface 210 may be Figure 5 The closed annular surface shown. Figure 5 The molding surface 210 shown is formed by four first curved segments connected smoothly. The four first curved segments are first curved segment 220a, first curved segment 220b, first curved segment 220c and first curved segment 220d. With the center point of the second workpiece 200 as the origin O, the length direction of the second workpiece 200 as the X axis, and the width direction of the second workpiece 200 as the Y axis, the following is established: Figure 5 The three-dimensional coordinate system shown. Please refer to Figure 6 In this example, the four first curve segments are respectively located at the positions where the outer contour dimensions of the second workpiece 200 are the largest.

[0038] It is understandable that in other embodiments, the molding surface 210 may also be formed by smoothly connecting more first curved segments, and the molding surface 210 may also be other structures. For example, the molding surface 210 may be a non-closed curved surface. As an example, the molding surface 210 may be formed by smoothly connecting the first curved segment 220a, the first curved segment 220b, and the first curved segment 220c in sequence, which will not be described in detail here.

[0039] Please refer to Figures 2 to 4 In some preferred embodiments, the tool 100 includes a cutting portion 110 and a clamping portion 120. The clamping portion 120 is coaxially formed on the top of the cutting portion 110. The cutting portion 110 is provided with a plurality of chip grooves 112 to form a plurality of blades 111. During machining, the chips cut from the first workpiece can be discharged by the chip grooves 112.

[0040] Please refer to Figures 1 to 4 In some more preferred embodiments, the cutting portion 110 and the clamping portion 120 are integrally formed, reducing the loosening or breakage problems that may occur due to the connection of components, thereby improving the stability and reliability of the tool 100, improving processing efficiency and product quality, and extending the service life of the tool 100.

[0041] It is understandable that in other embodiments, the cutting portion 110 and the clamping portion 120 may also be fixedly connected into one body in other ways, which will not be elaborated herein.

[0042] Please refer to Figures 1 to 4 , the end where the cutting portion 110 is connected to the clamping portion 120 is the top end of the cutting portion 110, and the end of the cutting portion 110 away from the clamping portion 120 is the bottom end of the cutting portion 110. In some more preferred embodiments, the diameter of the cutting portion 110 first gradually decreases and then gradually increases in the direction away from the clamping portion 120. That is to say, in the direction from the top end to the bottom end of the cutting portion 110, the diameter of the cutting portion 110 first gradually decreases and then gradually increases. Not only can it effectively avoid the tool 100 being too large due to the large difference in diameters at both ends of the cutting portion 110, but it is also more convenient to use the end of the cutting portion 110 away from the clamping portion 120 to process the undercut surface. As an example, the second curved segment 143 can be used to process the undercut surface. The second curved segment 143 can not only process the following: Fig.16 The undercut surface shown is located on the outer surface of the second workpiece 200, and can also be used to process the undercut surface formed on the inner surface of the product. For example, the undercut surface formed on the hole wall. The curved surface processing tool 100 of this embodiment is more flexible to use and has a wide range of applications.

[0043] Please refer to Figures 1 to 4In some more preferred embodiments, the diameter of the top of the cutting portion 110 is greater than the diameter of the clamping portion 120. In other words, the bottom of the clamping portion 120 is completely connected to the top of the cutting portion 110, so that the connection between the cutting portion 110 and the clamping portion 120 is more stable, and it is more convenient for the cutting portion 110 to process the first workpiece.

[0044] Please refer to Figure 2 and Figure 4 In some more preferred embodiments, all the chip grooves 112 are evenly spaced around the axis 130 of the tool 100, and all the chip grooves 112 have the same structure. During the cutting process, the chip grooves 112 can effectively discharge the generated chips to prevent the chips from accumulating between the tool 100 and the first workpiece, thereby maintaining the continuity and stability of the cutting process and preventing the chips from scratching the processing area of ​​the first workpiece or affecting the processing quality. It can also reduce the resistance during the cutting process, thereby improving the cutting efficiency, making the cutting force distribution more uniform, and reducing the wear and breakage of the tool 100. Moreover, by effectively discharging the chips, the chip grooves 112 can reduce the friction and heat accumulation between the tool 100 and the chips, thereby reducing the wear rate of the tool 100 and extending the service life of the tool 100.

[0045] Please refer to Figure 4 In some examples, each chip groove 112 extends from the bottom of the cutting portion 110 to the clamping portion 120, further ensuring the strength of the tool 100, avoiding stress concentration at the connection between the cutting portion 110 and the clamping portion 120, and extending the service life of the tool 100.

[0046] In some examples, each second curve segment matches at least one first curve segment. That is, the number of second curve segments is less than or equal to the number of first curve segments, which effectively reduces the cost of the tool 100 and reduces the production cost.

[0047] As an example, please refer to Figure 5 to Figure 6 In the second workpiece 200 shown, the first curve segment 220 b and the first curve segment 220 d are completely identical and can completely overlap with each other. Therefore, the first curve segment 220 b and the first curve segment 220 d both coincide with the second curve segment 142 .

[0048] In some examples, the tool 100 is connected to the spindle of a five-axis CNC machine tool. Under the drive of the five-axis CNC machine tool, the special-shaped surface can be processed quickly, thereby improving the processing efficiency and processing quality. Figures 14 to 16During processing, the axis 130 of the tool 100 is always parallel to the Z axis of the five-axis CNC machine tool, thereby maintaining the stability of the cutting process. During processing, the tool 100 can also rotate around its own axis 130, the tool 100 can also move, and the first workpiece can adjust the angle at any time. Please refer to Figures 14 to 16 , to ensure that the processing area to be processed is consistent with the contour line 140 corresponding to the tool 100, so as to process the molding surface 210. As an example, during processing, driven by the five-axis CNC machine tool, the tool 100 can rotate and move along the Z axis of the five-axis CNC machine tool and the X axis of the five-axis CNC machine tool. Driven by the five-axis CNC machine tool, the first workpiece can rotate and can also move along the Y axis of the five-axis CNC machine tool, so that the tool 100 can move relative to the first workpiece, start processing from the first curve segment 220a, then gradually process to the first curve segment 220b, then gradually process to the first curve segment 220c, then gradually process to the first curve segment 220d, and then gradually process back to the first curve segment 220a, and the processing is completed.

[0049] It is understandable that, in other embodiments, the axis 130 of the tool 100 may not be parallel to the Z axis of the five-axis CNC machine tool, and the tool 100 and the first workpiece may also move in other ways, which will not be elaborated here.

[0050] In some more preferred embodiments, the number of blades 111 is 2 to 5. Figures 2 to 4 As shown, it can ensure processing efficiency and quality, and also ensure smooth excretion.

[0051] As an example, the number of blades of the blade 111 can be designed based on the material of the first workpiece. When the material of the first workpiece is harder, the number of blades of the blade 111 can be set to be more. When the material of the first workpiece is softer, the number of blades of the blade 111 can be set to be less. The number of blades 111 can be set as needed.

[0052] In some examples, the tool 100 may be made of cemented carbide.

[0053] It is understandable that in other embodiments, the tool 100 may be made of other materials.

[0054] The curved surface machining tool 100 of the present utility model embodiment is used to machine the machining area of ​​the first workpiece to form a molding surface 210, thereby obtaining a second workpiece 200 having the molding surface 210, please refer to Figure 5 shown.

[0055] The processing method applied to the above-mentioned curved surface processing tool 100 at least includes:

[0056] Step S10, controlling the tool 100 to move relative to the first workpiece in the processing area of ​​the first workpiece to process the processing area to form a molding surface 210, thereby obtaining the second workpiece 200. Figure 5 , wherein the forming surface 210 is formed by smoothly connecting a plurality of first curve segments spaced apart along the direction of the processing track.

[0057] Please refer to Figures 2 to 4 In the embodiment of the utility model, the tool 100 includes a plurality of blades 111. All blades 111 are evenly spaced around the axis 130 of the tool 100. Moreover, all blades 111 have the same structure. The contour line 140 of the blade 111 is fitted by a plurality of second curve segments, and each first curve segment is matched with a second curve segment.

[0058] As an example, the first workpiece may be a semi-finished product that has been roughly processed, and the shape of the first workpiece may be substantially similar to the shape of the second workpiece 200 .

[0059] It is understandable that in other embodiments, the first workpiece may also be in other shapes. As long as the processing area of ​​the first workpiece can form a molding surface 210 after being cut by the tool 100, the second workpiece 200 can be obtained.

[0060] In the processing method applied to the above-mentioned curved surface processing tool 100, the tool 100 rotates around the axis 130 of the tool 100 itself, and at the same time, the tool 100 moves relative to the first workpiece in the processing area of ​​the first workpiece to process the processing area to form a molding surface 210. During processing, the contour line 140 of the blade 111 is in contact with the first workpiece line being processed, and the contour line 140 of the blade 111 is fitted by a plurality of second curve segments, wherein each first curve segment 220 coincides with a second curve segment, not only can the second workpiece 200 with the molding surface 210 be formed in one time, thereby improving the processing efficiency, but also the molding surface 210 obtained by processing has light knife marks and good surface effect, and the subsequent grinding yield is also improved.

[0061] As an example, please refer to Figure 5 and Figure 6, the molding surface 210 is a closed annular special-shaped curved surface, and the molding surface 210 is formed by smoothly connecting the first curve segment 220a, the first curve segment 220b, the first curve segment 220c and the first curve segment 220d which are arranged in sequence along the processing track direction. In other words, the molding surface 210 is divided into four sequentially connected molding surface segments by the first curve segment 220a, the first curve segment 220b, the first curve segment 220c and the first curve segment 220d, which are molding surface segment 211, molding surface segment 212, molding surface segment 213 and molding surface segment 214. Among them, in this example, the first curve segment 220b and the first curve segment 220d are exactly the same. The contour line 140 of the blade 111 is formed by smoothly fitting the second curve segment 141, the second curve segment 142 and the second curve segment 143. Among them, the second curve segment 141 coincides with the first curve segment 220a. Since the first curve segment 220b and the first curve segment 220d are completely identical, and the second curve segment 142 and the first curve segment 220b and the first curve segment 220d are respectively matched, the cost of the tool 100 can be effectively reduced, and the stability of the tool 100 can be improved. The second curve segment 143 and the first curve segment 220c are matched. During processing, the tool 100 moves one circle relative to the first workpiece in the processing area of ​​the first workpiece, thereby processing the processing area of ​​the first workpiece to form Figure 5 The closed annular molding surface 210 is shown.

[0062] In this example, first, the tool 100 moves relative to the first workpiece to Fig.14 When the tool 100a is in the position shown in FIG. 1 , the second curved segment 141 of the tool 100a makes linear contact with the processing area to cut the processing area, forming a first curved segment 220a that matches the second curved segment 141. As the tool 100 continues to process along the processing area, the tool 100 always keeps linear contact with the processing area to cut the processing area, gradually processing a forming surface segment 211 from the first curved segment 220a to the first curved segment 220b. During this process, the contact line between the tool 100 and the first workpiece gradually transitions from the second curved segment 141 to the second curved segment 142. When the tool 100 moves relative to the first workpiece to Fig.15 When the tool 100 is in the position shown in FIG. 100b, the second curved segment 142 of the blade 111 contacts the processing area line to cut the processing area, forming a first curved segment 220b that matches the second curved segment 142. As the tool 100 continues to process along the processing area, the tool 100 always keeps in contact with the processing area line to cut the processing area, gradually processing the forming surface segment 212 from the first curved segment 220b to the first curved segment 220c. During this process, the contact line between the tool 100 and the first workpiece gradually transitions from the second curved segment 142 to the second curved segment 143. When the tool 100 moves relative to the first workpiece to Fig.16When the tool 100 is in the position shown in FIG. 100c, the second curved segment 143 of the blade 111 is in line contact with the processing area to cut the processing area, forming a first curved segment 220c that matches the second curved segment 143. As the tool 100 continues to process along the processing area, the tool 100 always keeps in line contact with the processing area to cut the processing area, gradually processing the forming surface segment 213 from the first curved segment 220c to the first curved segment 220d. During this process, the contact line between the tool 100 and the first workpiece gradually transitions from the second curved segment 143 to the second curved segment 142. Then the tool 100 moves relative to the first workpiece until the second curved segment 142 of the blade 111 is in line contact with the processing area, forming a first curved segment 220d that matches the second curved segment 142. The tool 100 continues to move relative to the first workpiece, gradually processing the forming surface segment 214 between the first curved segment 220d and the first curved segment 220a. During this process, the contact line between the tool 100 and the first workpiece gradually transitions from the second curved segment 142 to the second curved segment 141. Fig.14 When the tool 100a is in the position shown, the tool 100 just moves around the first workpiece relative to the first workpiece, and the processing area of ​​the first workpiece is processed to form a molding surface 210, thereby obtaining a second workpiece 200 with a molding surface 210, and the processing is completed.

[0063] Understandably, Figures 14 to 16 The figure is only a schematic diagram of the tool 100 moving, and does not mean that three tools 100 are used to process the first workpiece at the same time in this processing method. In this processing method, only one tool 100 is used to process the first workpiece to obtain the second workpiece 200 with the molding surface 210.

[0064] In some preferred embodiments, the processing method applied to the above-mentioned curved surface processing tool 100 further includes steps S20 to S30 before step S10:

[0065] Step S20 , fitting the first curve segment of the molding surface 210 to obtain the contour line 140 of the blade 111 .

[0066] Step S30 , obtaining the tool 100 based on the contour line 140 of the blade 111 .

[0067] As an example, please refer to Figure 5 and Figure 6The molding surface 210 is formed by smoothly connecting the first curved segment 220a, the first curved segment 220b, the first curved segment 220c and the first curved segment 220d which are arranged in sequence along the machining track direction. Among them, the first curved segment 220b and the first curved segment 220d are exactly the same. With the center point of the second workpiece 200 as the origin O, the length direction of the second workpiece 200 as the X axis, and the width direction of the second workpiece 200 as the Y axis, the following is established: Figure 5 In the three-dimensional coordinate system shown, the molding surface 210 of the second workpiece 200 is symmetrically arranged about the YZ plane, wherein the molding surface segments 212 and the molding surface segments 213 are symmetrically arranged about the YZ plane, and the molding surface segments 211 and the molding surface segments 214 are symmetrically arranged about the YZ plane. Therefore, when fitting the first curve segment of the molding surface 210, the first curve segment 220b and the first curve segment 220d can be regarded as the same curve segment, and the contour line 140 of the blade 111 can be obtained by fitting the first curve segment 220b and the first curve segment 220c with the first curve segment 220a in sequence. The molding surface segment 211 can be regarded as a plurality of third curve segments 230 arranged in sequence along the direction from the first curve segment 220a to the first curve segment 220b and located between the first curve segment 220a and the first curve segment 220b are connected in sequence smoothly. Similarly, the molding surface segments 212, the molding surface segments 213 and the molding surface segments 214 can also be regarded as a plurality of third curve segments 230 connected in sequence smoothly. The contour line 140 of the blade 111 includes all the contours of the molding surface 210, including all the third curve segments 230 in addition to the first curve segment 220a, the first curve segment 220b, the first curve segment 220c and the first curve segment 220d. The contour line 140 of the blade 111 includes all the contours of the molding surface 210 to be processed, and the tool 100 can form the molding surface 210 in one process without changing the tool or processing multiple times along the processing area. As an example, when the molding surface 210 is a closed annular surface, the tool 100 can obtain the molding surface 210 by processing one circle around the processing area without reciprocating multiple circles. When the molding surface 210 is a non-closed surface that is not connected at the beginning and the end, such as the molding surface segment 211, the tool 100 can obtain the molding surface segment 211 by processing from the first curve segment 220a to the first curve segment 220b without reciprocating multiple times.

[0068] In some examples, step S30 may specifically include steps S31 to S33:

[0069] Step S31, based on the contour line 140 of the blade 111, obtain the central axis of the tool 100, please refer to Fig.11 , the central axis of the tool 100 refers to the axis 130 of the tool 100 .

[0070] As an example, the minimum distance H between the center axis of the tool 100 and the contour line 140 of the blade 111 can be within the preset range to avoid the minimum distance H between the center axis of the tool 100 and the contour line 140 of the blade 111 being too small, that is, the minimum radius of the cutting portion 110 is too small, resulting in insufficient strength of the blade 111, thereby causing the blade 111 to break. The preset range can be set as needed according to the material of the first workpiece and actual processing requirements, and is not limited here, as long as it is ensured that the blade 111 is not easily broken.

[0071] In step S32 , the cutting portion 110 of the tool 100 is obtained based on the contour line 140 of the blade 111 and the central axis of the tool 100 .

[0072] It is understandable that the cutting portion 110 of the tool 100 can be obtained by obtaining a 3D model of the cutting portion 110 of the tool 100. The cutting portion 110 of the tool 100 is a rotating body with the central axis of the tool 100 as the axis and the contour line 140 of the blade 111 as the generatrix. Fig.12 .

[0073] Step S33 , based on the cutting part 110 , the clamping part 120 is obtained to obtain the tool 100 .

[0074] In some exemplary embodiments, the clamping portion 120 is fixedly connected to the top of the cutting portion 110, and the clamping portion 120 is coaxially arranged with the cutting portion 110. The clamping portion 120 may be cylindrical, and the diameter of the clamping portion 120 may be set as required, which is not limited here. It is understood that step S33 may specifically refer to designing a 3D model of the clamping portion 120 connected to the 3D model of the cutting portion 110 based on the 3D model of the cutting portion 110, so as to obtain a 3D model of the tool 100, please refer to Fig.13 .

[0075] In some examples, step S30 may further include step S34, which is located after step S33:

[0076] Step S34 , obtaining the tool 100 having the chip removal groove 112 .

[0077] It is understandable that after obtaining the 3D model of the tool 100 in step 33, the entity of the tool 100 can be processed according to the 3D model of the tool 100, and then multiple chip grooves 112 can be opened on the entity of the tool 100 as needed to form multiple blades 111. Alternatively, after obtaining the 3D model of the tool 100 in step 33, the chip grooves 112 can be further designed on the 3D model of the tool 100 to obtain the 3D model of the tool 100 with the chip grooves 112, and then the entity of the tool 100 can be processed according to the 3D model of the tool 100 with the chip grooves 112. The specific steps of step S34 are not limited here, so they will not be repeated.

[0078] As an example, the number and specific size of the chip grooves 112 can be designed based on the material of the first workpiece, which is not limited here.

[0079] In some preferred embodiments, the processing method applied to the curved surface processing tool 100 further includes steps S40 to S60 before step S20:

[0080] Step S40 , obtaining a 3D model of the second workpiece 200 .

[0081] As an example, the second workpiece 200 having the molding surface 210 can be 3D modeled in 3D drawing software to obtain a 3D model of the second workpiece 200. Figure 5 and Figure 6 Accordingly, step S20, step S30, step S50 and step S60 may also be implemented using 3D drawing software. In some examples, the 3D drawing software may be UG. It is understandable that the 3D drawing software may also be other 3D drawing software.

[0082] Step S50, obtaining a cross section of the 3D model of the second workpiece 200, the cross section is obtained by the intersection of the cutting plane and the 3D model of the second workpiece 200, the cutting plane is perpendicular to the XY plane of the model coordinate system of the 3D model of the second workpiece 200 and passes through the Z axis of the model coordinate system, the origin of the model coordinate system is the center point of the 3D model, please refer to Figure 5 .

[0083] Step S60 , obtaining an outer contour line of the cross section, and using the outer contour line as a first curve segment of the molding surface 210 .

[0084] For some examples, see Figure 5 and Figure 6 As shown, the section plane can be a YZ plane, that is, the section plane is perpendicular to the XY plane of the model coordinate system of the 3D model of the second workpiece 200 and passes through the Y axis of the model coordinate system. The section plane can also be an XZ plane, that is, the section plane is perpendicular to the XY plane of the model coordinate system of the 3D model of the second workpiece 200 and passes through the X axis of the model coordinate system.

[0085] In one example, there are two cutting planes, namely the first cutting plane and the second cutting plane. The first cutting plane is the YZ plane, and the first cutting plane intersects with the 3D model of the second workpiece 200 to obtain the section 240a and the section 240c. The second cutting plane is the XZ plane, and the second cutting plane intersects with the 3D model of the second workpiece 200 to obtain the section 240b and the section 240d. The outer contour line of the section 240a, the outer contour line of the section 240b, the outer contour line of the section 240c, and the outer contour line of the section 240d are obtained, and the outer contour line of the section 240a is used as the first curved segment 220a, the outer contour line of the section 240b is used as the first curved segment 220b, the outer contour line of the section 240c is used as the first curved segment 220c, and the outer contour line of the section 240d is used as the first curved segment 220d.

[0086] It is understandable that in other embodiments, other cross sections of the 3D model of the second workpiece 200 and the outer contour lines of the cross sections may also be obtained, as long as the designed tool 100 can process the molding surface 210 .

[0087] In some examples, step S20 may obtain the contour line 140 based on the cross-section fitting of the first curve segment. As an example, the following may be fitted: Figure 7 The first curved section 220a of the cross section 240a shown in FIG. Figure 8 The first curved line segment 220b of the cross section 240b shown in FIG. Fig. 9 The first curved segment 220c and the first curved segment 220d of the cross section 240c, wherein the cross section 240d having the first curved segment 220d and Figure 8 The cross section 240b with the first curve segment 220b shown is completely the same, that is, when fitting, the first curve segment 220b and the first curve segment 220d can completely overlap. Therefore, in this example, only the first curve segment 220a, the first curve segment 220b and the first curve segment 220c can be fitted. Fig.10 The outer contour line of the cross section shown is the curve obtained by fitting the first curve segment 220a, the first curve segment 220b and the first curve segment 220c, that is, the contour line 140 of the blade 111. Among them, the first curve segment 220a and the first curve segment 220b partially overlap, and the first curve segment 220b and the first curve segment 220c partially overlap.

[0088] It is understandable that in other embodiments, other methods may be used to fit the first curve segment of the molding surface 210 as long as the contour line 140 of the blade 111 can be obtained.

[0089] In one example, a processing method applied to the above-mentioned curved surface processing tool 100 includes:

[0090] Step S40 , obtaining a 3D model of the second workpiece 200 .

[0091] Step S50, obtaining a cross section of the 3D model of the second workpiece 200, the cross section being obtained by the intersection of the cutting plane and the 3D model of the second workpiece 200, the cutting plane being perpendicular to the XY plane of the model coordinate system of the 3D model of the second workpiece 200 and passing through the Z axis of the model coordinate system, the origin of the model coordinate system being the center point of the 3D model.

[0092] Step S60 , obtaining the outer contour line 140 of the cross section, and using the outer contour line 140 as the first curve segment of the molding surface 210 .

[0093] Step S20 , fitting the first curve segment of the molding surface 210 to obtain the contour line 140 of the blade 111 .

[0094] Step S30 , obtaining the tool 100 based on the contour line 140 of the blade 111 .

[0095] Step S10, installing the tool 100 and the first workpiece on a five-axis CNC machine tool, controlling the tool 100 to move relative to the first workpiece in the processing area of ​​the first workpiece, so as to process the processing area to form a molding surface 210, thereby obtaining the second workpiece 200.

[0096] In the processing method applied to the above-mentioned curved surface processing tool 100, under the drive of the five-axis CNC machine tool, the tool 100 rotates around the tool 100's own axis 130, and at the same time, the tool 100 moves relative to the first workpiece in the processing area of ​​the first workpiece to process the processing area, and the molding surface 210 can be quickly formed, thereby improving the processing efficiency and processing quality. During processing, the contour line 140 of the blade 111 is in contact with the first workpiece line being processed, and the contour line 140 of the blade 111 is fitted by a plurality of second curve segments, wherein each first curve segment coincides with a second curve segment, and not only can the second workpiece 200 with the molding surface 210 be formed in one time, thereby improving the processing efficiency, but also the molding surface 210 obtained by processing has light knife marks and good surface effect, and also improves the subsequent grinding yield.

[0097] In some preferred embodiments, the processing method applied to the curved surface processing tool 100 may further include steps S70 to S80 after step S10:

[0098] Step S70 , fine grinding the second workpiece 200 .

[0099] Step S80 , performing fluid polishing on the second workpiece 200 after fine grinding.

[0100] Among them, the fine grinding process and the fluid polishing process are existing technologies, so they are not described in detail.

[0101] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, 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.

[0102] The above embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. Surface machining tool, characterized in that: Used for processing special-shaped curved surfaces, the special-shaped curved surfaces are formed by smoothly connecting multiple first curve segments arranged at intervals, the tool includes multiple blades with the same structure that are evenly spaced around the axis of the tool, the contour line of the blade is fitted by multiple second curve segments, wherein each of the first curve segments coincides with one of the second curve segments.

2. The curved surface machining tool according to claim 1, characterized in that: The tool comprises a cutting portion and a clamping portion coaxially formed on the top of the cutting portion. The cutting portion is provided with a plurality of chip removal grooves to form the plurality of cutting edges.

3. The curved surface machining tool according to claim 2, characterized in that: The cutting portion and the clamping portion are integrally formed.

4. The curved surface machining tool according to claim 2, characterized in that: The diameter of the cutting portion gradually decreases and then gradually increases in a direction away from the clamping portion.

5. The curved surface machining tool according to claim 2, characterized in that: The diameter of the top of the cutting portion is greater than the diameter of the clamping portion.

6. The curved surface machining tool according to claim 2, characterized in that: The plurality of chip removal grooves are evenly spaced around the axis of the tool and have the same structure.

7. The curved surface machining tool according to claim 2, characterized in that: Each of the chip removal grooves extends from the bottom of the cutting portion to the clamping portion.

8. The curved surface machining tool according to claim 1, characterized in that: Each of the second curve segments coincides with at least one of the first curve segments.

9. The curved surface machining tool according to claim 1, characterized in that: The axis of the tool is parallel to the Z axis.

10. The curved surface machining tool according to claim 1, characterized in that: The number of the blades is 2 to 5.

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