A multi-angle thin-walled part milling method

Abstract

This application discloses a milling method for multi-angle thin-walled parts, including the following steps: roughing the part, reserving preset allowances for dimension surfaces A, B, and F, through holes P and Q, and datum surface C; mounting the part on a fixture, with dimension surfaces D and E on the part respectively engaging with the first pre-mounting surface H and the second pre-mounting surface I on the fixture, and the datum surface C extending beyond the fixture by a greater than the preset allowance; mounting the fixture on the chuck of a machining center and machining the datum surface C; rotating the fixture 180° and machining dimension surface A; rotating the A-axis of a four-axis machine tool to an angle of α° and machining the dimension surface F of through hole P; rotating the A-axis of the four-axis machine tool to an angle of β° and machining the dimension surface B of through hole Q. This application has the advantages of convenient clamping and high machining efficiency.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a milling method for multi-angle thin-walled parts. Background Technology

[0002] Currently, the optical systems for equipment guidance and detection are developing towards larger field of view, lighter weight and more compact design. As a result, multi-angle and thin-walled designs have become the mainstream, and their complexity is obvious. This has brought considerable difficulties to machining, specifically in terms of clamping and cutting.

[0003] A multi-angle thin-walled part with an irregular shape is available, comprising a first segment 31, a second segment 32, a third segment 33, and a fourth segment 34 connected sequentially. The first segment 31 and the second segment 32 are bent in the same direction relative to the third segment 33, and the third segment 33 is a zigzag shape. The first segment 31 and the second segment 32 are respectively provided with through holes P and Q. The technical requirements are: flatness controlled within 0.005mm, bending angle tolerance ±0.02°, spatial dimensional tolerance controlled within ±0.02mm, and minimum wall thickness 2.5mm. Firstly, this part 3 is used as an optical system component, requiring extremely high dimensional and geometric tolerances. Part 3 must not suffer damage or deformation during processing. If a three-axis machining platform is used, ball end milling cannot guarantee the flatness. Secondly, part 3 is a thin-walled component, which is inherently difficult to clamp. If a five-axis machining platform is used, interference between machining and clamping will occur, making it impossible to complete the machining in one go, resulting in angular deviations. Using common adhesive methods also fails to achieve multi-angle machining. Furthermore, excessive cutting depth during machining can easily cause part deformation, while insufficient cutting depth leads to low efficiency. Therefore, a machining method that can achieve the technical objectives while also facilitating clamping is needed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a milling method for multi-angle thin-walled parts that is easy to clamp and has high processing efficiency.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A milling method for multi-angle thin-walled parts includes the following steps:

[0007] S1, rough machining of the part, except for the datum surface C, the other non-mating dimensions are machined to the finished size, and the dimensional surfaces A, B, F, through holes P and Q and the datum surface C are reserved with preset allowances;

[0008] S2, install the part on the fixture, the dimension surface D and the pre-installation surface E on the part are respectively matched with the first pre-installation surface H and the second pre-installation surface I on the fixture, and the reference surface C extends out relative to the fixture and the extension amount is greater than the preset allowance;

[0009] S3, install the fixture body on the chuck of the machining center, align the outer circle on the fixture body, and level the reserved datum surface G on the fixture body. At this time, the machining state is the initial state. Machin the datum surface C to the finished size.

[0010] S4, a 180° rotating fixture, processes dimension A to the finished product size;

[0011] S5, rotate the A axis of the four-axis machine tool to an angle of α°, set the machining origin at the center of the standard bar, offset the Y-axis coordinate of the machining center by a distance Y1 to machine hole P, and then offset the Z-axis coordinate by a distance Z1 to machine the dimensional surface F. Y1 is the distance along the Y direction of the line connecting the through hole P and the center of the standard bar, and Z1 is the distance along the Z direction of the line connecting the dimensional surface F and the center of the standard bar.

[0012] S6. Rotate the A axis of the four-axis machine tool to an angle of β°, set the machining origin at the center of the standard bar, offset the Y-axis coordinate by Y2 to machine the through hole Q, and then offset the Z-axis coordinate by Z2 to machine the dimension surface B. Y2 is the distance along the Y direction of the line connecting the through hole Q and the center of the standard bar, and Z2 is the distance along the Z direction of the line connecting the dimension surface B and the center of the standard bar.

[0013] The thickness direction of the part is taken as the Z-axis, the width direction of the part is taken as the X-axis, and the direction perpendicular to the X and Y directions is taken as the Z-axis.

[0014] As a further improvement to the above technical solution:

[0015] The distances Y1 and Z1 are calculated using formulas (1) and (2), respectively:

[0016] Y1=[L2-(d2-L1)×tanα+d1]×cosα (1)

[0017] Z1=[L2-(d2-L1)×tanα+d1]×sinα+(d2-L1) / cosα (2)

[0018] In the above formula, angle α is the angle between the projection lines of the second and third surfaces of the part on the longitudinal section along the length of the part; L1 is the perpendicular distance along the Z direction of the line connecting the intersection of the central axis of the through hole P and the dimension surface F with the dimension surface A; L2 is the perpendicular distance along the Y direction of the line connecting the intersection of the central axis of the through hole P and the dimension surface F with the dimension surface A; d1 is the perpendicular distance along the Y direction of the line connecting the datum surface C and the center of the standard bar; and d2 is the perpendicular distance along the Z direction of the line connecting the dimension surface A and the center of the standard bar.

[0019] The distances Y2 and Z2 are calculated using formulas (3) and (4), respectively:

[0020] Y2=[L4-(d2-L3)×tanβ+d1]×cosβ (3)

[0021] Z2=[L4-(d2-L3)×tanβ+d1]×sinβ+(d2-L3) / cosβ (4)

[0022] In the above formula, angle β is the angle between the projection lines of the first and third segments of the part on the longitudinal section along the length of the part, L3 is the perpendicular distance along the Z direction of the line connecting the intersection of the central axis of the through hole Q and the dimension surface B and the dimension surface A, and L4 is the perpendicular distance along the Y direction of the line connecting the intersection of the central axis of the through hole Q and the dimension surface B and the dimension surface A.

[0023] The clamping body includes an outer circle, a clamping body and a standard bar. The outer peripheral wall of one end of the outer circle is clamped by a machine tool chuck, and the standard bar and the clamping body are arranged on the side of the outer circle away from the chuck.

[0024] The clamping body is arranged on the side near the center of the outer circle, and the standard bar is located on the outer side of the clamping body.

[0025] The clamping body includes a support body, a first clamping block and a second clamping block. The first clamping block and the second clamping block are spaced apart on a surface of the support body. The first clamping block is used to clamp the first segment of the part, and the second clamping block is used to clamp the third segment of the part.

[0026] The first clamping block is provided with a clamping groove, a reserved groove, and a limiting member located between the reserved groove and the clamping groove. The clamping groove is set in the direction closer to the support body, and the reserved groove is set in the direction away from the support body. The side of the clamping groove serves as the second pre-installation surface I and the sides of the first segment dimension surface B to clamp the part.

[0027] It also includes bolts, which are installed on the first clamping block and positioned away from the support body. The bolts pass through the reserved groove and press the limiting member, which is then pressed and deformed towards the clamping groove.

[0028] It also includes a pressure plate and screws. The pressure plate is located below the second clamping block. The screws connect the pressure plate and the second clamping block into one unit. By rotating the screws, the pressure plate is pulled toward the second clamping block to clamp the third segment of the part. The lower surface of the second clamping block serves as the first pre-installation surface H and the dimensional surface D to cooperate. The reference surface C of the fourth segment extends relative to the second clamping block.

[0029] The upper surface of the support body is provided with a platform, and the platform has a reserved reference surface G on a plane parallel to the direction of the outer circle central axis. The first segment of the part is set on the side close to the reserved reference surface G, and the fourth segment of the part is set on the side close to the standard bar.

[0030] Compared with the prior art, the advantages of the present invention are as follows:

[0031] This invention discloses a milling method for multi-angle thin-walled parts. The part does not require highly precise positioning on the fixture; the reference surface C only needs to extend beyond the fixture by a greater than a preset allowance. This facilitates clamping, reduces the impact of clamping errors on accuracy, and results in high-precision finished products with high processing efficiency. Machining at each angle only requires calculating the CNC machining coordinate origin using formulas, which is convenient and quick. This is a relatively economical invention, suitable for small-batch production of new products. Attached Figure Description

[0032] Figure 1 This is a front view of the multi-angle thin-walled part of the present invention.

[0033] Figure 2 This is a side view of the multi-angle thin-walled part of the present invention.

[0034] Figure 3 For the present invention Figure 1 Sectional view along line LL.

[0035] Figure 4 For the present invention Figure 1 Sectional view along line LL.

[0036] Figure 5 This is a three-dimensional structural diagram of the parts of the present invention when they are clamped.

[0037] Figure 6 This is a front view of the parts of this invention when they are clamped.

[0038] Figure 7 for Figure 6 Enlarged view of a section at point M.

[0039] Figure 8 yes Figure 6 Side view from point M to J.

[0040] Figure 9 This is a top view of the parts of this invention when they are clamped.

[0041] Figure 10 for Figure 9 A magnified view of a portion of point N in the middle.

[0042] Figure 11 This is a schematic diagram of the tool and part positions in the A0° state of the milling process method of the present invention.

[0043] Figure 12This is a schematic diagram of the tool and part positions in the A180° state of the milling process method of the present invention.

[0044] Figure 13 This is a schematic diagram of the tool and part positions in state Aα° of the milling process method of the present invention.

[0045] Figure 14 This is a schematic diagram of the tool and part positions in state Aβ° of the milling method of the present invention.

[0046] The labels in the diagram represent:

[0047] 1. Chuck; 2. Clamping body; 21. Outer circle; 22. Clamping body; 221. Support body; 2211. Platform; 222. First clamping block; 2221. Clamping groove; 2222. Reserved groove; 2223. Limiting component; 223. Second clamping block; 23. Standard bar; 2222. Reserved groove; 3. Part; 31. First section; 32. Second section; 33. Third section; 34. Fourth section; 4. Bolt; 5. Pressure plate; 6. Screw; Detailed Implementation

[0048] 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.

[0049] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0051] In this application, unless otherwise expressly specified and limited, the terms "connection," "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 application according to the specific circumstances.

[0052] Example 1

[0053] like Figures 1 to 4 As shown, a multi-angle thin-walled part 3 of this embodiment has an irregular shape and includes a first segment 31, a second segment 32, a third segment 33, and a fourth segment 34 connected in sequence. The first segment 31 and the second segment 32 are bent in the same direction relative to the third segment 33, and the third segment 33 is in a zigzag shape. The bending angle of the first segment 31 is greater than that of the second segment 32. The first segment 31 and the second segment 32 are respectively provided with through holes P and Q. The fourth segment 34 is parallel to the third segment 33 and its thickness is greater than that of the third segment 33. On the longitudinal section along the length of the part 3, there is an angle β between the projection lines on the surface of the first segment 31 and the projection lines on the surface of the third segment 33, and the projection lines on the surface of the second segment 32 are... An angle α exists between the projection lines of the first segment 31 and the second segment 32, where β > α; taking the bending direction of the first segment 31 and the second segment 32 as the inner side, the surface of the inner side of the first segment 31 is dimension surface B, the sides of the first segment 31 located on both sides of dimension surface B are pre-mounting surfaces E, the surface of the second segment 32 is dimension surface F, the surface of the fourth segment 34 is dimension surface D (the surface of the third segment 33 is on the same plane as dimension surface D), the lower end surface of the fourth segment 34 is reference surface C, and the surface of the fourth segment 34 is dimension surface A, which protrudes outward relative to the outer side of the third segment 33; taking the thickness direction of part 3 as the Z direction, and the width direction of part 3 as the X direction (… Figure 4 (In the direction perpendicular to the paper), with the direction perpendicular to the X and Y directions as the Z direction, the vertical distance along the Z direction between the intersection of the central axis of through hole P and the dimension surface F and the dimension surface A is denoted as L1, and the vertical distance along the Y direction is denoted as L2. The vertical distance along the Z direction between the intersection of the central axis of through hole Q and the dimension surface B and the dimension surface A is denoted as L3, and the vertical distance along the Y direction is denoted as L4.

[0054] Technical requirements: Flatness (dimension B and dimension A) controlled within 0.005mm, bending angle (α, β) tolerance ±0.02°, spatial dimensions (L1, L2, L3, L4) tolerance controlled within ±0.02mm, minimum wall thickness (distance S between the inner and outer surfaces of the third segment 33) 2.5mm.

[0055] like Figures 5 to 10 As shown, the clamping body 2 of this embodiment includes an outer circle 21, a clamping body 22 and a standard bar 23. The outer peripheral wall of one end of the outer circle 21 is clamped by the machine tool chuck 1. The standard bar 23 and the clamping body 22 are arranged on the side of the outer circle 21 away from the chuck 1. The clamping body 22 is arranged in the direction close to the center of the outer circle 21, and the standard bar 23 is located on the outer side of the clamping body 22.

[0056] In this embodiment, the central axis of the standard bar 23 is parallel to the central axis of the outer circle 21.

[0057] The clamping body 22 includes a support body 221, a first clamping block 222 and a second clamping block 223. The first clamping block 222 and the second clamping block 223 are spaced apart on one surface of the support body 221. The first clamping block 222 is used to clamp the first segment 31 of the part 3, and the second clamping block 223 is used to clamp and fix the third segment 33 of the part 3.

[0058] In this embodiment, the first clamping block 222 is provided with a clamping groove 2221, a reserved groove 2222, and a limiting member 2223 located between the reserved groove 2222 and the clamping groove 2221. The clamping groove 2221 is arranged in the direction close to the support body 221, and the reserved groove 2222 is arranged in the direction away from the support body 221. The side of the clamping groove 2221 serves as the second pre-installation surface I and the side surfaces on both sides of the first segment 31 dimension surface B to clamp and fix the part 3.

[0059] In this embodiment, a bolt 4 is also included. The bolt 4 is installed on the first clamping block 222 and is positioned away from the support body 221. The bolt 4 passes through the reserved groove 2222 and presses against the limiting member 2223. The limiting member 2223 is deformed by pressing against the clamping groove 2221, thus restricting the degree of freedom of the part 3. The bolt 4 is arranged parallel to the central axis of the outer circle 21.

[0060] In this embodiment, the pressure plate 5 is located below the second clamping block 223, and the screw 6 connects the pressure plate 5 and the second clamping block 223 into one unit. By rotating the screw 6, the pressure plate 5 is pulled toward the second clamping block 223 to clamp the third segment 33 of the part 3. The lower surface of the second clamping block 223 serves as the first pre-installation surface H and the dimension surface D to cooperate. The reference surface C of the fourth segment 34 extends relative to the second clamping block 223, and the extension amount of the reference surface C is greater than the reserved allowance of the reference surface C.

[0061] When bolts 4 and screws 6 fasten part 3, they do not directly contact part 3. By deforming the limiting part 2223 or the pressure plate 5 to press part 3, part 3 can be well protected and prevented from being deformed.

[0062] The upper surface of the support body 221 is provided with a platform 2211. The platform 2211 has a reserved reference surface G on a plane parallel to the central axis of the outer circle 21. After the part 3 is installed, the end of the first segment 31 of the part 3 is set close to the reserved reference surface G, and the end of the fourth segment 34 of the part 3 is set close to the standard bar 23.

[0063] This embodiment of a milling method for multi-angle thin-walled parts includes the following steps:

[0064] S1. For multi-angle thin-walled parts during rough machining, except for the reference surface C of part 3, the other non-mating dimensions are machined to the finished size. Dimension surfaces A, B, F, through holes P and Q and reference surface C are reserved with a margin of 0.2 to 0.4 mm.

[0065] S2. Install part 3 on fixture 2. Fit the dimension surface D and pre-installation surface E on part 3 with the first pre-installation surface H and the second pre-installation surface I on fixture 2 respectively. The extension of reference surface C out of fixture 2 should be greater than the allowance of reference surface C. Tighten screw 6 to compress and deform pressure plate 5, restricting one degree of freedom of part 3 (first clamping block 2222 restricts X-axis movement). Tighten bolt 4 to compress and deform the thin plate formed by the reserved groove 2222 on the fixture, restricting the other degree of freedom of part 3 (second clamping block 2223 restricts Z-axis movement).

[0066] S3. Install the fixture 2 containing part 3 onto the four-axis chuck 1 of the vertical machining center. The four-axis chuck 1 of the vertical machining center can rotate 360° around its own central axis (coaxial with the A-axis of the machine tool machining center). The direction of the milling cutter axis is parallel to the vertical direction. The direction of the milling cutter is the Z-axis, and the direction of the central axis of the chuck 1 is the X-axis (perpendicular to the paper). The direction perpendicular to the Z-axis and X-axis is the Y-axis (in the following content, the coordinate axes of the vertical machining center are named X-axis, Z-axis, Y-axis, and A-axis, and the coordinate axes of the part with the thickness and width of part 3 as the standard are named X-direction, Y-direction, and Z-direction). Rotating the A-axis is the direction of the Y-axis. Align the outer circle 21 on the fixture 2 within 0.02mm, straighten (level) the reserved datum surface G on the fixture 2 within 0.02mm, and make the third segment dimension surface D of part 3 horizontal. At this time, the state of the vertical machining center is recorded as A0° state (i.e., the initial state, such as...). Figure 11 As shown in the figure, Y and Z are the coordinate axes of the machining center. Figure 12 , 13 In section 14, the initial state is also such that the coordinate axes of the machining center are in the same direction as the coordinate axes of the part.

[0067] S4. In state A0°, machine the reference surface C to the finished size, rotate chuck 1 to horizontally rotate the fixture body 2 (part 3 also rotates horizontally at the same time), and record the machining state at this time as state A180°. Figure 12 As shown, dimension surface A is machined to the finished size at A180°. To further ensure the flatness of dimension surface A, a small-diameter milling cutter is used for cutting, with a layer cutting depth of 0.005~0.015mm.

[0068] Use a dial indicator to measure the vertical distance d1 along the Y direction between the line connecting the datum surface C and the center of the standard bar 23 after machining, and the vertical distance d2 along the Z direction between the line connecting the dimensional surface A and the center of the standard bar 23.

[0069] S5. Rotate the A-axis of the machining center counterclockwise to an angle of α°. The state of the vertical machining center at this point is denoted as state Aα°. Figure 13 As shown, the second segment 32 of part 3 is set horizontally, the origin of the machining center coordinate axis is set at the center of the standard bar 23, the Y-axis coordinate of the machining center coordinate axis is offset by Y1 to machine the through hole P, and the Z-axis coordinate of the machining center coordinate axis is offset by Z1 to machine the dimension surface F.

[0070] The distance along the Y-axis between the through hole P and the center of the standard rod 23 is Y1 = [L2 - (d2 - L1) × tanα + d1] × cosα. The distance along the Z-axis between the dimension surface F and the center of the standard rod 23 is Z1 = [L2 - (d2 - L1) × tanα + d1] × sinα + (d2 - L1) / cosα.

[0071] S6. Rotate the A-axis of the machining center counterclockwise to an angle of β°, so that the first segment 31 of part 3 is horizontal. The state of the vertical machining center at this time is recorded as state Aβ°. Figure 14 As shown, the origin of the machining center coordinate axis is set at the center of the standard bar 23. The Y-axis coordinate of the machining center coordinate axis is offset by Y2 to machine the through hole Q, and the Z-axis coordinate is offset by Z2 to machine the dimension surface B. To further ensure the flatness of the dimension surface B, a small diameter milling cutter is used for cutting, and the layer cutting depth is 0.005~0.015mm.

[0072] The distance along the Y direction between the through hole Q and the center of the standard rod 203 is Y2 = [L4 - (d2 - L3) × tanβ + d1] × cosβ. The distance along the Z direction between the dimension surface B and the center of the standard rod 23 is Z2 = [L4 - (d2 - L3) × tanβ + d1] × sinβ + (d2 - L3) / cosβ.

[0073] Testing revealed that the multi-angle thin-walled parts, after processing, meet the dimensional and geometric tolerance requirements of the preferred embodiment without causing damage to the parts.

[0074] 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 milling method for multi-angle thin-walled parts, characterized in that: Includes the following steps: S1, rough machining of part (3), except for the reference surface C, the other non-mating dimension surfaces are machined to the finished size, and the dimension surfaces A, B, F, through holes P and Q and the reference surface C are reserved with preset allowances; S2, install part (3) on fixture (2), the dimension surface D and pre-installation surface E on part (3) respectively cooperate with the first pre-installation surface H and the second pre-installation surface I on fixture (2), the reference surface C extends out relative to fixture (2) and the extension amount is greater than the preset allowance; S3, install the fixture (2) on the chuck (1) of the machining center, align the outer circle (21) on the fixture (2), level the reserved datum surface G on the fixture (2), and machine the datum surface C to the finished size; S4, 180° rotating fixture (2), to process dimension surface A to the finished size; S5, rotate the A axis of the four-axis machine tool to an angle of α°, set the machining origin at the center of the standard bar (23), offset the Y-axis coordinate of the machining center by Y1 to machine the through hole P, and then offset the Z-axis coordinate by Z1 to machine the dimension surface F. Y1 is the distance along the Y direction of the line connecting the through hole P and the center of the standard bar (23), and Z1 is the distance along the Z direction of the line connecting the dimension surface F and the center of the standard bar (23). S6. Rotate the A axis of the four-axis machine tool to an angle of β°, set the machining origin at the center of the standard bar (23), offset the Y-axis coordinate of the machining center by Y2 to machine the through hole Q, and then offset the Z-axis coordinate by Z2 to machine the dimension surface B. Y2 is the distance along the Y direction of the line connecting the through hole Q and the center of the standard bar (23), and Z2 is the distance along the Z direction of the line connecting the dimension surface B and the center of the standard bar (23). The thickness direction of part (3) is taken as Z direction, the width direction of part (3) is taken as X direction, and the direction perpendicular to X and Y directions is taken as Z direction; The distances Y1 and Z1 are calculated using formulas (1) and (2), respectively: Y1=[L2-(d2-L1)×tanα+d1]×cosα(1) Z1=[L2-(d2-L1)×tanα+d1]×sinα+(d2-L1) / cosα(2) In the above formula, angle α is the angle between the projection lines of the second segment (32) surface and the third segment (33) surface of part (3) on the longitudinal section along the length direction of part (3), L1 is the vertical distance along the Z direction of the line connecting the intersection of the central axis of through hole P and the dimension surface F with the dimension surface A, L2 is the vertical distance along the Y direction of the line connecting the intersection of the central axis of through hole P and the dimension surface F with the dimension surface A, d1 is the vertical distance along the Y direction of the line connecting the reference surface C and the center of the standard bar (23), and d2 is the vertical distance along the Z direction of the line connecting the dimension surface A and the center of the standard bar (23).

2. The milling method according to claim 1, characterized in that: The distances Y2 and Z2 are calculated using formulas (3) and (4), respectively: Y2=[L4-(d2-L3)×tanβ+d1]×cosβ(3) Z2=[L4-(d2-L3)×tanβ+d1]×sinβ+(d2-L3) / cosβ(4) In the above formula, angle β is the angle between the projection lines of the first segment (31) surface and the third segment (33) surface on the longitudinal section along the length direction of part (3), L3 is the vertical distance along the Z direction of the line connecting the intersection of the central axis of through hole Q and dimension surface B and dimension surface A, and L4 is the vertical distance along the Y direction of the line connecting the intersection of the central axis of through hole Q and dimension surface B and dimension surface A.

3. The milling method according to claim 1, characterized in that: The clamping body (2) includes an outer circle (21), a clamping body (22) and a standard bar (23). The outer peripheral wall of one end of the outer circle (21) is clamped by the machine tool chuck (1). The standard bar (23) and the clamping body (22) are arranged on the side of the other end of the outer circle (21) away from the chuck (1).

4. The milling method according to claim 3, characterized in that: The clamping body (22) is arranged on one side near the center of the outer circle (21), and the standard rod (23) is located on the outer side of the clamping body (22).

5. The milling method according to claim 3, characterized in that: The clamping body (22) includes a support body (221), a first clamping block (222) and a second clamping block (223). The first clamping block (222) and the second clamping block (223) are spaced apart on one surface of the support body (221). The first clamping block (222) is used to clamp the first segment (31) of the part (3), and the second clamping block (223) is used to clamp the third segment (33) of the part (3).

6. The milling method according to claim 5, characterized in that: The first clamping block (222) is provided with a clamping groove (2221), a reserved groove (2222), and a limiting member (2223) located between the reserved groove (2222) and the clamping groove (2221). The clamping groove (2221) is arranged in the direction close to the support body (221), and the reserved groove (2222) is arranged in the direction away from the support body (221). The side of the clamping groove (2221) serves as the second pre-installation surface I and the side of the first segment (31) dimension surface B to clamp the part (3).

7. The milling method according to claim 6, characterized in that: It also includes bolts (4), which are installed on the first clamping block (222) and set away from the side of the support body (221). The bolts (4) pass through the reserved groove (2222) and squeeze the limiting member (2223). The limiting member (2223) is squeezed and deformed towards the clamping groove (2221).

8. The milling method according to any one of claims 3 to 7, characterized in that: It also includes a pressure plate (5) and screws (6). The pressure plate (5) is located below the second clamping block (223). The screws (6) connect the pressure plate (5) and the second clamping block (223) into one unit. By rotating the screws (6), the pressure plate (5) is pulled toward the second clamping block (223) to clamp the third segment (33) of the part (3). The lower surface of the second clamping block (223) serves as the first pre-installation surface H and the dimension surface D. The reference surface C of the fourth segment (34) extends relative to the second clamping block (223).

9. The milling method according to any one of claims 5 to 7, characterized in that: The upper surface of the support body (221) is provided with a platform (2211). The platform (2211) has a reserved reference surface G on a plane parallel to the central axis of the outer circle (21). The first segment (31) of the part (3) is set on the side close to the reserved reference surface G, and the fourth segment (34) of the part (3) is set on the side close to the standard bar (23).

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