A machining method for a fine and complex part

Abstract

The application discloses a machining method for fine and complex parts, which comprises the following steps: S1, rough machining the part, and reserving preset allowance on the outer cylindrical surface and each size surface of the part; S2, mounting the transition part and the plane part of the part on the lathe chuck through a first clamp, aligning the first outer cylindrical section and the second outer cylindrical section, and precisely machining the outer cylindrical part to the finished product size; S3, mounting the second outer cylindrical section of the part on the machining center chuck through a second clamp, aligning the outer cylindrical runout of the second clamp, supporting the back surface of the plane part, straightening and precisely milling the front surface of the plane part to the finished product size; and S4, rotating the machining center chuck by 180 degrees, supporting the front surface of the plane part, and precisely milling the back surface of the plane part and the side surface of the first protruding part to the finished product size. The application has the advantages of stable and firm clamping and high machining precision.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a method for machining small and complex parts. Background Technology

[0002] Currently, many research institutions abroad have carried out a lot of basic research. Metal mirrors are used in high-end optical systems such as infrared cameras, telescopes, and high-energy lasers. Considering the factors of lightweighting and time in some confined spaces, metal mirrors are often designed to be small in size. However, in order to achieve the reflection effect, the dimensional accuracy requirements are high, which adds a lot of challenges to the machining process.

[0003] There is a small and complex component, a metal reflector with a special structure. One end of the component is cylindrical, while the other end is flat. The cylindrical end serves as a fixed end, and the flat end functions as a metal reflecting mirror. This component is small and requires high dimensional and positional accuracy. Figure 1 and 2 As shown, the part includes an outer circular portion 11, a transition portion 12, and a planar portion 13 connected in sequence. The outer circular portion 11 includes a threaded segment 111, a first outer circular segment 112, and a second outer circular segment 113 arranged in sequence along the axial direction. The outer circumferential surface of the threaded segment 111 has an external thread. The diameter of the first outer circular segment 112 is smaller than that of the second outer circular segment 113. The second outer circular segment 113 is located on the side closer to the transition portion 12. The transition portion 12 includes a first protrusion 121 and a second protrusion 122. The first protrusion 121 and the second protrusion 122 are disposed facing each other at the top and bottom of the transition portion 12. The height of the second protrusion 122 is less than that of the first protrusion 121. The planar portion 13 is planar. The thickness of the planar portion 13 is less than that of the outer circular portion 11 and the transition portion 12. The front side (bottom surface of the planar portion 13) is denoted as dimension surface A, the back side as dimension surface D, the outer peripheral surface of the threaded segment 111 as thread surface J, the outer peripheral surface of the first outer circular segment 112 as outer circular surface H, the outer peripheral surface of the second outer circular segment 113 as outer circular surface G, the surface of the first protrusion 121 facing the outer circular portion 11 as dimension surface E, the two sides of the first protrusion 121 along the width direction of the part as dimension surface C and dimension surface B, and the surface of the second protrusion 122 facing the planar portion 13 as dimension surface F.

[0004] This part is a small metal reflector, and its size is too small. The outer circle 11 is only 32mm long, the flat surface 13 is only 3.2mm thick, the threaded section 111 has a diameter of 3mm, the first outer circle 112 has a diameter of 3.175mm, and the second outer circle 113 has a diameter of 4mm. The diameter tolerance of the first outer circle 112 and the second outer circle 113 is required to be between -0.012 and -0.004mm. The shortest distance from the front of the flat surface 13 to the central axis of the outer circle 12 is 2.6mm, and the tolerance is required to be controlled within ±0.01mm. The parallelism requirement of the front and back of the flat surface 13 relative to the first outer circle 112 and the second outer circle 113 is 0. Within 0.5, the width distance between dimension surface C and dimension surface B is 4mm, the dimensional tolerance requirement is between -0.022 and -0.01mm, and the symmetry with respect to the first outer circular segment 112 and the second outer circular segment 113 is within 0.05mm. The dimensional accuracy requirement is high. It is difficult to achieve this technical target requirement by conventional milling or turning machining methods for such special parts. On the other hand, the part has an irregular structure and cannot be clamped by a three-jaw chuck. Existing clamping fixtures are prone to deforming the part, which is a big problem. Furthermore, the cutting amount during cutting affects the product quality. If the cutting amount is too large, it will easily cause the part to deform. If the cutting amount is too small, the efficiency is low and mass production is not possible. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for processing small and complex parts with stable and reliable clamping and high processing accuracy.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A method for machining small and complex parts includes the following steps:

[0008] S1, rough-machined part, with preset allowances on the outer cylindrical surface and various dimensional surfaces of the part;

[0009] S2, the transition part and flat part of the part are mounted on the lathe chuck by the first fixture, the first outer cylindrical section and the second outer cylindrical section are aligned and the outer cylindrical part of the part is precision machined to the finished size;

[0010] S3, mount the second outer circular segment of the part on the chuck of the machining center using the second fixture, align the runout of the outer circle of the second fixture, support the back of the flat part, straighten and finish mill the front of the flat part of the part to the finished size;

[0011] S4, a 180° rotating machining center chuck, supports the front of the flat part, and finishes the back of the flat part and the side of the first protrusion to the finished size.

[0012] As a further improvement to the above technical solution:

[0013] The first clamp includes a first clamping outer circle and a first fastener. One end of the first clamping outer circle is provided with a first mounting groove and a second mounting groove. The other end of the first clamping outer circle is clamped onto a lathe chuck. The second mounting groove is connected to the first mounting groove. The first mounting groove and the second mounting groove are respectively used to position the planar part and the transition part. The outer circumferential surface of the first clamping outer circle is provided with a third mounting hole that is connected to the first mounting groove. The first fastener cooperates with the third mounting hole and is pressed onto the planar part.

[0014] The two sides of the second mounting groove mate with the two sides of the first protrusion, the bottom surface of the first mounting groove mates with the front surface of the flat surface, the outer circular end face of the first clamping part mates with the side of the second protrusion facing the flat surface, and the end face of the first fastener is pressed onto the back surface of the flat surface.

[0015] The second clamp includes a second clamping outer circle, a support arm, a second fastener, and a second support member. The support arm is connected to one end of the second clamping outer circle, and the other end of the second clamping outer circle clamps onto a machining center chuck. The second clamping outer circle is provided with a first through hole for mounting a first outer circle segment and a second outer circle segment. The second support member is connected to the support arm and is used to support the flat portion. The second fastener cooperates with the threaded section to lock the part and the second clamping outer circle together.

[0016] The support arm and the second clamping outer circle are detachably connected.

[0017] The second clamp also includes a third fastener, and the support arm and the second clamping outer circle are detachably connected by the third fastener.

[0018] The second clamping outer circumference is symmetrically provided with a third mounting groove. The third mounting groove is provided with a second threaded hole in the direction near the central axis. The third mounting groove is used to install the support arm, and the second threaded hole is used to install the third fastener.

[0019] In step S4, the front side of the supporting plane portion specifically refers to:

[0020] A1. After removing the third fastener and removing the support arm from the second clamping outer circle, install the support arm in another third mounting groove on the second clamping outer circle.

[0021] A3, rotate the second support member to support the front of the flat part.

[0022] The third fastener is a bolt, the second fastener is a nut, and the second support member is a bolt.

[0023] The second outer circular segment mates with the first through hole, and the side of the first protrusion facing the outer circular portion mates with the second clamping outer circular end face.

[0024] In step S2, S3, or S4, during the precision turning or milling, the cutting amount for each cut is between 0.005 mm and 0.01 mm.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] This invention discloses a method for machining small and complex parts. By using a first fixture, irregularly shaped structures that cannot be clamped by a three-jaw chuck are transformed into a three-jaw chuck that clamps the first fixture. During finish turning, only the first and second outer circular sections need to be aligned. The second fixture not only protects the outer circular portion of the part with its precise dimensions, but also increases the clamping diameter to facilitate clamping, thus avoiding the technical problem of clamping parts with small outer circular dimensions. This second fixture can be used for machining on four-axis or five-axis equipment, and can also be used during rough milling. The clamping is stable and reliable, and the machining accuracy is high. Attached Figure Description

[0027] Figure 1 This is a front view of the part of the present invention.

[0028] Figure 2 This is a side view of the part of the present invention.

[0029] Figure 3 An isometric view of the machining clamp for the parts of this invention.

[0030] Figure 4 This is a front view of the part during precision machining according to the present invention.

[0031] Figure 5 This is a right view of the part being precision machined according to the present invention.

[0032] Figure 6 This is an isometric view of the part clamped at A0° during precision milling according to the present invention.

[0033] Figure 7 This is an isometric view of the part being precision milled using the A180° clamping method.

[0034] Figure 8 This is a top view at A0° during the precision milling of the part according to the present invention.

[0035] Figure 9 for Figure 8 Sectional view along line AA.

[0036] The labels in the diagram represent:

[0037] 1. Part; 11. Outer circle; 111. Threaded section; 112. First outer circle; 113. Second outer circle; 12. Transition section; 121. First protrusion; 122. Second protrusion; 13. Flat section; 2. First fixture; 21. First clamping outer circle; 211. First mounting groove; 212. Second mounting groove; 213. Third mounting hole; 22. First fastener; 3. Second fixture; 31. Second clamping outer circle; 311. First through hole; 312. Second threaded hole; 32. Support arm; 321. First threaded hole; 322. Second through hole; 313. Third mounting groove; 33. Second fastener; 34. Second support member; 35. Third fastener; 4. Lathe chuck; 5. Machining center chuck. Detailed Implementation

[0038] The present invention will be further described in detail below. Unless otherwise specified, the instruments or materials used in the present invention are commercially available.

[0039] In the description of this invention, it should be understood that the terms "width", "upper", "lower", "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 invention 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 invention.

[0040] 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 invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] Example 1

[0043] The target product of this embodiment is part 1 described in the background art. This part is a small metal reflector. The outer diameter 11 is only 32mm long, the flat surface 13 is only 3.2mm thick, the threaded section 111 has a diameter of 3mm, the first outer diameter 112 has a diameter of 3.175mm, and the second outer diameter 113 has a diameter of 4mm. The diameter tolerance of the first outer diameter 112 and the second outer diameter 113 is required to be between -0.012 and -0.004mm. The front of the flat surface 13 extends to the outer diameter 111. The shortest distance between the two central axes is 2.6 mm and the tolerance is required to be controlled within ±0.01 mm. The parallelism between the front and back of the flat part 13 with respect to the first outer circular segment 112 and the second outer circular segment 113 is required to be within 0.05. The width distance between the dimension surface C and the dimension surface B is 4 mm. The dimensional tolerance is required to be between -0.022 and -0.01 mm and the symmetry with respect to the first outer circular segment 112 and the second outer circular segment 113 is required to be within 0.05 mm. The dimensional accuracy requirements are high.

[0044] The processing method for small and complex parts in this embodiment includes the following steps:

[0045] S1, rough machining of part 1, with a preset allowance reserved on the outer cylindrical surface and all dimensional surfaces of part 1;

[0046] S2, the transition part 12 and flat part 13 of part 1 are mounted on the lathe chuck 4 through the first fixture 2, the first outer cylindrical section 112 and the second outer cylindrical section 113 are aligned, and the outer cylindrical part 11 of part 1 is precision machined to the finished size;

[0047] S3, the second outer circular segment 113 of part 1 is mounted on the chuck 5 of the machining center through the second fixture 3, the runout of the outer circle of the second fixture 3 is aligned, the back of the flat part 13 is supported, and the front of the flat part 13 of part 1 is straightened and precision milled to the finished size.

[0048] S4, 180° rotating machining center chuck 5, supporting the front of the flat part 13, precision milling the back of the flat part 13 of the part 1 and the side of the first protrusion 121 to the finished size.

[0049] The machining method for small and complex parts of the present invention transforms irregularly shaped structures that cannot be clamped by a three-jaw chuck into a three-jaw chuck clamping the first fixture by using a first fixture 1. During finish turning, only the first outer circle segment 112 and the second outer circle segment 113 need to be aligned. The second fixture 3 not only protects the outer circle 11 of the part 1 with its fine dimensions, but also increases the clamping diameter by clamping the outer circle 31, thus avoiding the technical problem that the outer circle of the part 1 is too small to be clamped. The second fixture 3 can be used for machining on four-axis or five-axis equipment, and can also be used for rough milling. The clamping is stable and reliable, and the machining accuracy is high.

[0050] The machining center in this embodiment is a four-axis milling machining center.

[0051] In step S2, S3, or S4, during the precision turning or milling, the cutting amount for each cut is between 0.005 mm and 0.01 mm, thereby preventing part 1 from bending and deforming.

[0052] like Figures 3 to 5 As shown, the first clamping fixture 2 includes a first clamping outer circle 21 and a first fastener 22. One end of the first clamping outer circle 21 is provided with a first mounting groove 211 and a second mounting groove 212. The other end of the first clamping outer circle 21 clamps the lathe chuck 4. The second mounting groove 212 communicates with the first mounting groove 211. The first mounting groove 211 and the second mounting groove 212 are used to position the flat part 13 and the transition part 12, respectively. The outer circumferential surface of the first clamping outer circle 21 is provided with a third mounting hole 213 that communicates with the first mounting groove 211. The first fastener 22 cooperates with the third mounting hole 213 and is pressed onto the flat part 13. By setting the first mounting groove 211, the second mounting groove 212 and the first fastener 22, the three degrees of freedom of the part 1 are restricted, so as to better process the part.

[0053] In this embodiment, the third mounting hole 213 is a threaded hole.

[0054] In this embodiment, the two sides of the second mounting groove 212 cooperate with the two sides of the first protrusion 121, the bottom surface of the first mounting groove 211 cooperates with the front surface of the flat surface 13, the end face of the first clamping outer circle 21 cooperates with the side of the second protrusion 122 facing the flat surface 13, and the end face of the first fastener 22 is pressed on the back surface of the flat surface 13.

[0055] In this embodiment, the difference between the distance from the bottom surface of the first mounting groove 211 (first pre-mounting surface P) to the axis of the first clamping outer circle 21 and the distance from the front surface of part 1 (dimensional surface A) to the axis of part 1 should be controlled within 0.01mm. That is, when part 1 is installed in the first mounting groove 211, the axis of part 1 and the axis of the first clamping outer circle 21 are essentially coaxial and collinear to ensure machining accuracy. In this embodiment, the top surface of the first mounting groove 211 only needs to be able to ensure that part 1 can be placed inside the first mounting groove 211.

[0056] The second mounting groove 212 is similar to a keyway. The two sides of the second mounting groove 212 are respectively referred to as the second pre-mounting surface Q and the third pre-mounting surface R. The difference between the distance between the second pre-mounting surface Q and the third pre-mounting surface R and the distance between the dimension surface B and dimension surface C of part 1 should be controlled within 0.005mm to 0.015mm to ensure the limiting effect on the transition part 12 of part 1.

[0057] The third mounting hole 213 is perpendicular to the first pre-mounting surface P and is located on the first clamping outer circle 21.

[0058] like Figures 6 to 9 As shown, the second clamping fixture 3 includes a second clamping outer circle 31, a support arm 32, a second fastener 33, and a second support member 34. The support arm 32 is connected to one end of the second clamping outer circle 31, and the other end of the second clamping outer circle 31 clamps onto the machining center chuck 5. The second clamping outer circle 31 has a first through hole 311 for mounting the first outer circle segment 112 and the second outer circle segment 113. The second support member 34 is connected to the support arm 32 and is used to support the flat portion 13. The second fastener 33 cooperates with the threaded segment 111 to lock the part 1 and the second clamping outer circle 31 in a tight fit. The first through hole 311 and the second fastener 33 protect the finished outer circle portion 11, preventing damage during subsequent processing. At the same time, the dimensions of the transition portion 12 and the flat portion 13 that need to be machined are reserved for subsequent processing.

[0059] The support arm 32 and the second clamping outer circle 31 are detachably connected. This detachable connection improves the efficiency of machining the front and back sides of the flat part 13. After machining the front side of the flat part 13, there is no need to disassemble part 1 or realign the runout of the second clamping outer circle 31. Simply disassemble the support arm 32 and move its position to the back side of the flat part 13 to replace the fixture. Compared to disassembling the entire second clamping outer circle 31 and remachining part 1, this method is more efficient and more suitable for commercial production.

[0060] In this embodiment, the second clamp 3 further includes a third fastener 35, and the support arm 32 and the second clamping outer circle 31 are detachably connected by the third fastener 35.

[0061] In this embodiment, a third mounting groove 313 is symmetrically arranged (symmetrically arranged about the central axis) on the outer circumferential surface of the second clamping outer circle 31. A second threaded hole 312 is provided on the side of the third mounting groove 313 closest to the central axis. The third mounting groove 313 is used to mount the support arm 32, and the second threaded hole 312 is used to mount the third fastener 35. The third mounting groove 313 is recessed relative to the outer circumferential surface to avoid interference between the support arm 32 and other components. In other embodiments, if the support arm 32 does not interfere with other components, the third mounting groove 313 may be omitted, and only the second threaded hole 312 may be provided for mounting the third fastener 35. That is, the second threaded hole 312 is symmetrically arranged on the outer circumferential surface of the second clamping outer circle 31, and the second threaded hole 312 is used for mounting the third fastener 35.

[0062] In this embodiment, the second fastener 33 is a nut, the third fastener 35 is a bolt, and the second support member 34 is a bolt.

[0063] The second outer circular segment 113 mates with the first through hole 311, and the side of the first protrusion 121 facing the outer circular portion 11 mates with the end face of the second clamping outer circular segment 31.

[0064] The difference between the diameter of the first through hole 311 and the diameter of the outer circle G of part 1 should be controlled within 0.005mm to 0.015mm. The coaxiality between the axis of the first through hole 311 and the axis of the second clamping outer circle 31 of the machining center should be within 0.01mm.

[0065] Insert part 1 into the first through hole 311 and tighten it by engaging the threaded surface J of part 1 with the second fastener 33, so that the dimension surface E of part 1 is in close contact with the end face (fifth pre-installation surface U) of the second clamping outer circle 31.

[0066] The support arm 32 has a second through hole 322 at one end and a first threaded hole 321 at the other end. The second through hole 322 is used to install the third fastener 35, and the first threaded hole 321 is used to install the second support member 34.

[0067] The second clamping outer circle 31 is provided with a third mounting groove 313 for accommodating the support arm 32 on the outer peripheral surface where the second threaded hole 312 is located (in this embodiment, there are two third mounting grooves 313). The second threaded hole 312 is located on the side of the third mounting groove 313 closer to the central axis (in this embodiment, there are two second threaded holes 312, which are set one-to-one with the third mounting groove 313). The end of the support arm 32 with the second through hole 322 is placed in the third mounting groove 313. The third fastener 35 passes through the second through hole 322 and engages with the second threaded hole 312 to connect the support arm 32 to the second clamping outer circle 31.

[0068] The second support 34 engages with the first threaded hole 321 on the support arm 32.

[0069] This embodiment of a milling and turning method for small, complex parts includes the following steps:

[0070] S1. During rough machining, allowance of 0.2mm to 0.3mm is reserved on each side of dimension surfaces A, B, C, D, G, H, and E of part 1.

[0071] S2. During precision machining, the flat end of part 1 (i.e., the flat part 13) is placed into the first mounting groove 211 on the first clamping outer circle 21. The dimension surfaces A, B, C, and F on part 1 respectively engage with the bottom surface (first pre-mounting surface P) of the first mounting groove 211, the side surface (second pre-mounting surface Q, third pre-mounting surface R) of the second mounting groove 212, and the end face (fourth pre-mounting surface S) of the first clamping outer circle 21. Then, the first fastener 22 engages with the third mounting hole 213 (pressure thread hole) on the first clamping outer circle 21. The first fastener 22 (pressure bolt) is tightened so that its end face abuts against the dimension surface D of part 1, thereby restricting the three degrees of freedom of part 1.

[0072] S3. Install the other end of the first clamping outer circle 21 of the lathe opposite to the part 1 on the lathe chuck 4, align the outer circle surface G and outer circle surface H of the part 1, and machine the outer circle surface G, outer circle surface H and thread surface J to the finished product.

[0073] S4. During precision milling, the outer cylindrical surface G of the precision-milled part 1 is inserted into the first through hole 311 (hole T) at the center of the second clamping outer circle 31. Then, the second fastener 33 is tightened by engaging with the threaded section 111 (threaded surface J) of part 1, so that the dimensional surface E of part 1 is in contact with the end face (fifth pre-installation surface U) of the second clamping outer circle 31 to achieve a tightening effect.

[0074] S5. Install the end of the second clamping outer circle 31 opposite to the part 1 on the chuck 5 of the machining center, align the runout of the second clamping outer circle 31 to within 0.01mm, and straighten the dimension surface A; then put the end of the support arm 32 with the second through hole 322 into the third mounting groove 313, and then use the third fastener 35 to pass through the second through hole 322 and engage with the second threaded hole 312 to tighten it, so that the support arm 32 and the second clamping outer circle 31 are connected together. Finally, engage the second support member 34 with the first threaded hole 321 on the support arm 32, and tighten the second support member 34 so that the end face of the second support member 34 abuts against the dimension surface D. It only needs to make contact, and the part 1 should not be bent. At this time, the dimension surface A can be machined to the finished size.

[0075] After machining S6 and A, remove the support arm 32 and the third fastener 35 from the second clamping outer circle 31, and remove the second support member 34 from the support arm 32. Then, rotate the machining center chuck 5 180° around the rotation center, and put the end of the support arm 32 with the second through hole 322 into the third mounting groove 313. Then, use the third fastener 35 to pass through the second through hole 322 and engage with the second threaded hole 312 to tighten it, so that the support arm 32 is connected to the second clamping outer circle 31. Finally, engage the second support member 34 with the first threaded hole 321 on the support arm 32, and tighten the second support member 34 so that the end face of the second support member 34 abuts against the dimension surface A. It is only necessary to make contact, but the part 1 should not be bent, and the dimension surface A should not be damaged. At this time, dimension surfaces B, C and D can be machined to the finished size.

[0076] Testing revealed that the small and complex part 1, after processing, meets the dimensional and geometric tolerance requirements of the preferred embodiment without causing damage to part 1.

[0077] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A method for machining small and complex parts, characterized in that: Includes the following steps: S1, rough machining of part (1), with a pre-set allowance reserved on the outer cylindrical surface and each dimension surface of part (1); S2, the transition part (12) and flat part (13) of part (1) are mounted on the lathe chuck (4) by the first fixture (2), the first outer circle section (112) and the second outer circle section (113) are aligned and the outer circle part (11) of part (1) is precision machined to the finished size; S3, install the second outer circular segment (113) of part (1) on the chuck (5) of the machining center through the second fixture (3), align the runout of the outer circle of the second fixture (3), support the back of the flat part (13), straighten and fine mill the front of the flat part (13) of part (1) to the finished size; S4, 180° rotating machining center chuck (5), supporting the front of the flat part (13), the back of the flat part (13) of the precision milled part (1), the side of the first protrusion (121) to the finished size; The second clamp (3) includes a second clamping outer circle (31), a support arm (32), a second fastener (33), and a second support member (34). The support arm (32) is connected to one end of the second clamping outer circle (31), and the other end of the second clamping outer circle (31) is clamped on the machining center chuck (5). The second clamping outer circle (31) is provided with a first through hole (311) for installing the first outer circle segment (112) and the second outer circle segment (113). The second support member (34) is connected to the support arm (32) and is used to support the flat part (13). The second fastener (33) cooperates with the threaded section (111) to lock the part (1) and the second clamping outer circle (31) together. A third mounting groove (313) is symmetrically provided on the outer circumferential surface of the second clamping outer circle (31), and the third mounting groove (313) is used to install the support arm (32).

2. The processing method according to claim 1, characterized in that: The first clamp (2) includes a first clamping outer circle (21) and a first fastener (22). One end of the first clamping outer circle (21) is provided with a first mounting groove (211) and a second mounting groove (212). The other end of the first clamping outer circle (21) is clamped on the lathe chuck (4). The second mounting groove (212) is connected to the first mounting groove (211). The first mounting groove (211) and the second mounting groove (212) are respectively used to position the flat part (13) and the transition part (12). The outer circumferential surface of the first clamping outer circle (21) is provided with a third mounting hole (213) that is connected to the first mounting groove (211). The first fastener (22) cooperates with the third mounting hole (213) and is pressed on the flat part (13).

3. The processing method according to claim 2, characterized in that: The two sides of the second mounting groove (212) are engaged with the two sides of the first protrusion (121). The bottom surface of the first mounting groove (211) is engaged with the front surface of the flat surface (13). The end face of the first clamping outer circle (21) and the side of the second protrusion (122) facing the flat part (13) are engaged. The end face of the first fastener (22) is pressed onto the back of the flat part (13).

4. The processing method according to any one of claims 1 to 3, characterized in that: The arm (32) and the second clamping outer circle (31) are detachably connected.

5. The processing method according to claim 4, characterized in that: The second clamp (3) also includes a third fastener (35), and the support arm (32) and the second clamping outer circle (31) are detachably connected by the third fastener (35).

6. The processing method according to claim 5, characterized in that: The third mounting groove (313) has a second threaded hole (312) on the side near the central axis, and the second threaded hole (312) is used to install the third fastener (35).

7. The processing method according to claim 6, characterized in that: In step S4, the front of the supporting plane part (13) is specifically as follows: A1, after removing the third fastener (35) and removing the support arm (32) from the second clamping outer circle (31), install the support arm (32) in another third mounting groove (313) of the second clamping outer circle (31); A2, rotate the second support member (34) to support the front of the flat part (13).

8. The processing method according to any one of claims 1 to 3, characterized in that: The second outer circular segment (113) is engaged with the first through hole (311), and the side of the first protrusion (121) facing the outer circular portion (11) is engaged with the end face of the second clamping outer circle (31).

9. The processing method according to any one of claims 1 to 3, characterized in that: In step S2, S3, or S4, during the precision turning or milling, the cutting amount for each cut is between 0.005 mm and 0.01 mm.

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