A grinding tool for grinding the inner hole of a cover rotating arm of a curve grinder and a grinding method

Abstract

A kind of grinding processing frock for grinding hole in arm of cover of curve grinder, including grinding frock base, cover fixed assembly, grinding frock base is set on the workbench of grinder, and the correction hole coaxial with the arm inner hole of cover is set in grinding frock base, cover fixed assembly includes fixed baffle, positioning bolt, the bottom of fixed baffle is vertically connected with grinding frock base, the side surface of fixed baffle is provided with the mounting surface matched with the cover end surface of cover, and the middle part of fixed baffle is provided with positioning hole, and positioning hole is fixedly connected with the center hole of cover by positioning bolt.This kind of processing frock can reduce clamping correction time in processing process, improve cover batch grinding processing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, specifically relating to a grinding fixture and method for the inner hole of the cover arm of a curve mill, which is suitable for reducing the clamping and correction time of the cover and improving the grinding efficiency. Background Technology

[0002] After the cap is coated with a nickel-based alloy, the inner hole of the rotating arm needs to be ground on a profile grinding machine. To improve the efficiency of batch grinding of caps, a machining fixture for grinding the inner hole of the cap's rotating arm using a profile grinding machine is urgently needed to reduce clamping and adjustment time during processing and improve the efficiency of batch grinding of caps. Furthermore, since the cap has two symmetrical structures, the grinding fixture needs to provide two machining stations to accommodate both types of symmetrical caps. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned problems in the prior art by providing a grinding fixture and method for the inner hole of the cover arm in curve grinding, which can reduce the clamping and correction time of the cover and improve the grinding efficiency.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] A grinding fixture for machining the inner hole of a cover arm in a curve mill is disclosed. The grinding fixture includes a grinding fixture base and a cover fixing assembly. The grinding fixture base is mounted on the worktable of the grinding machine and has a correction hole coaxial with the inner hole of the cover arm. The cover fixing assembly includes a fixing baffle and a positioning bolt. The bottom of the fixing baffle is vertically connected to the grinding fixture base. One side of the fixing baffle has a mounting surface that mates with the end face of the cover. A positioning hole is provided in the middle of the fixing baffle and is fixedly connected to the center hole of the cover by a positioning bolt.

[0006] The grinding fixture base includes a base plate and a processing plate. The base plate has a right-angled fan-shaped structure, and the processing plate has a circular structure. One side of the processing plate is fixedly connected to the base plate at a right angle. The correction hole is opened in the middle of the processing plate. There are two cover fixing components. The bottom of the fixing baffle in the two cover fixing components is perpendicularly connected to the two right-angled sides of the base plate.

[0007] The base plate has multiple mounting slots on its arc-shaped edge for fixed connection with the worktable of the grinding machine.

[0008] The positioning bolt has semi-circular holes on both sides of the screw head, and the semi-circular holes are fixedly connected to the fixing screw holes on the fixing baffle by a second screw.

[0009] The cover fixing assembly also includes multiple pressure plates and multiple first screws. The multiple pressure plates are arranged around the outer periphery of the cover. One side of the pressure plate rests on the cover teeth on the outer circle of the cover. One side of the pressure plate is provided with an arc surface that fits with the outer circle step of the cover. The other side of the pressure plate is provided with a first pressing hole. The first pressing hole and the second pressing hole opened on the fixing baffle are fixedly connected by the first screw.

[0010] The fixed baffle is a rectangular structure, and there are four pressure plates, four screws, and four second clamping holes, with the four second clamping holes respectively located at the four corners of the fixed baffle.

[0011] A first long rib and a first short rib are provided between the base plate and a fixed baffle, and a second long rib and a second short rib are provided between the base plate and another fixed baffle. The first long rib and the second long rib have the same structure, and both the first long rib and the second long rib are located close to the processing plate. The first short rib and the second short rib have the same structure.

[0012] A method for machining the inner hole of a cover arm for a curve mill, the method comprising the following steps:

[0013] S1. Place the grinding fixture base on the worktable of the grinding machine, calibrate the calibration hole to be coaxial with the rotation center of the grinding machine, and calibrate the mounting surface of the fixing baffle to be perpendicular to the worktable of the grinding machine; after calibration, fix the grinding fixture base on the worktable of the grinding machine.

[0014] S2. First, install the positioning bolt in the positioning hole on the fixed baffle. Then, mate the end face of the cover with the mounting surface on the fixed baffle and install the center hole of the cover on the positioning bolt. Tighten the nut on the positioning bolt with a small tightening torque.

[0015] S3. Align the inner hole of the cover arm with the rotation center of the grinding machine, and align the end face of the inner hole of the arm with the worktable surface of the grinding machine. After alignment, tighten the nuts on the positioning bolts with 100% torque.

[0016] S4. Perform grinding of the inner hole of the cover arm.

[0017] The positioning bolt has semi-circular holes on both sides of the screw head, and the semi-circular holes are fixedly connected to the fixing screw holes on the fixing baffle by the second screw.

[0018] In step S2, the semi-circular hole on the screw head of the positioning bolt is fixedly connected to the fixing screw hole on the fixing baffle by the second screw, so that the positioning bolt is installed in the positioning hole on the fixing baffle.

[0019] The cover fixing assembly also includes multiple pressure plates and multiple screws. The multiple pressure plates are arranged around the outer periphery of the cover. One side of the pressure plate rests on the cover teeth on the outer circle of the cover. One side of the pressure plate is provided with an arc surface that fits with the step on the outer circle of the cover. The other side of the pressure plate is provided with a first pressing hole. The first pressing hole and the second pressing hole opened on the fixing baffle are fixedly connected by the first screw.

[0020] In step S3, after the calibration is completed, the arc surface on one side of the pressure plate is first fitted to the outer periphery of the cover body, and the first pressing hole on the pressure plate is fixedly connected to the second pressing hole on the fixed baffle by the first screw. Finally, the nut on the positioning bolt is tightened with 100% tightening torque.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. This invention provides a grinding fixture for machining the inner hole of a cover arm in a curve mill, comprising a grinding fixture base and a cover fixing assembly. The grinding fixture base is mounted on the worktable of a grinding machine. A correction hole coaxial with the inner hole of the cover arm is provided on the grinding fixture base. The cover fixing assembly includes a fixing baffle and positioning bolts. The bottom of the fixing baffle is perpendicularly connected to the grinding fixture base. One side of the fixing baffle has an mounting surface that mates with the end face of the cover. A positioning hole is provided in the middle of the fixing baffle, and the positioning hole is fixedly connected to the center hole of the cover by positioning bolts. In use, the grinding fixture base is first placed on the worktable of the grinding machine, and the correction hole is aligned coaxially with the rotation center of the grinding machine. The fixing baffle is then aligned... The mounting surface is perpendicular to the worktable of the grinding machine. After alignment, the grinding fixture base is fixed to the worktable. Then, the positioning bolts are installed in the positioning holes on the fixed baffle. The end face of the cover is aligned with the mounting surface on the fixed baffle, and the center hole of the cover is installed on the positioning bolts. The nuts on the positioning bolts are tightened with a small torque. Next, the inner hole of the cover's rotating arm is aligned to be coaxial with the rotation center of the grinding machine, and the end face of the inner hole of the rotating arm is aligned to be parallel to the worktable of the grinding machine. After alignment, the nuts on the positioning bolts are tightened with 100% torque, and the grinding of the inner hole of the cover's rotating arm can then be performed. This type of machining fixture can reduce the clamping and alignment time during machining and improve the efficiency of batch grinding of covers. Therefore, this invention can reduce the clamping and alignment time of covers and improve grinding efficiency.

[0023] 2. In the grinding fixture for the inner hole of the cover arm of a curve mill according to the present invention, the grinding fixture base includes a base plate and a processing plate. The base plate has a right-angled fan-shaped structure, and the processing plate has a circular structure. One side of the processing plate is fixedly connected to the base plate at a right angle. A correction hole is opened in the middle of the processing plate. There are two cover fixing components. The bottom of the fixing baffles in the two cover fixing components are perpendicularly connected to the two right-angled sides of the base plate, respectively. This design provides two working positions. The two fixing baffles are used for grinding two symmetrical covers on the left and right sides, respectively, saving tooling manufacturing costs. Therefore, the present invention can be applied to grinding two symmetrical covers on the left and right sides, saving tooling manufacturing costs. Attached Figure Description

[0024] Figure 1 This is an assembly diagram of the grinding tooling and the cover body described in this invention.

[0025] Figure 2 for Figure 1 A schematic diagram of direction A.

[0026] Figure 3 This is a schematic diagram of the cover structure.

[0027] Figure 4 This is a sectional view of the cover.

[0028] Figure 5 This is a schematic diagram of the grinding tooling described in this invention.

[0029] Figure 6 This is a schematic diagram of the structure of the grinding fixture base in this invention.

[0030] Figure 7 This is a schematic diagram of the structure of the fixed baffle in this invention.

[0031] Figure 8 This is a cross-sectional view of the fixed baffle in this invention.

[0032] Figure 9 This is a schematic diagram of the positioning bolt in this invention.

[0033] Figure 10 for Figure 9 A schematic diagram of the structure of the semi-circular hole.

[0034] Figure 11 This is a schematic diagram of the pressure plate in the present invention.

[0035] Figure 12 This is a schematic diagram of the structure of the first long stiffener plate in this invention.

[0036] Figure 13 This is a schematic diagram of the structure of the first short stiffener in this invention.

[0037] In the above figure, the grinding fixture base 1, the alignment hole 11, the base plate 12, the processing plate 13, the mounting groove 14, the cover fixing assembly 2, the fixing baffle 3, the mounting surface 31, the positioning hole 32, the fixing screw hole 33, the second screw 34, the second clamping hole 35, the positioning bolt 4, the screw head 41, the semi-circular hole 42, the pressure plate 5, the arc surface 51, the first clamping hole 52, the first screw 6, the first long rib 7, the second long rib 71, the first short rib 8, the second short rib 81, the cover 9, the inner hole of the rotating arm 91, the end face of the cover 92, the center hole 93, the cover teeth 94, and the step 95. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0039] See Figures 1 to 13 A grinding fixture for machining the inner hole of the cover arm of a curve mill is disclosed. The grinding fixture includes a grinding fixture base 1 and a cover fixing assembly 2. The grinding fixture base 1 is set on the worktable of the grinding machine and has a correction hole 11 coaxial with the inner hole 91 of the cover arm. The cover fixing assembly 2 includes a fixing baffle 3 and a positioning bolt 4. The bottom of the fixing baffle 3 is vertically connected to the grinding fixture base 1. A mounting surface 31 that mates with the end face 92 of the cover 9 is provided on one side of the fixing baffle 3. A positioning hole 32 is provided in the middle of the fixing baffle 3. The positioning hole 32 is fixedly connected to the center hole 93 of the cover 9 by the positioning bolt 4.

[0040] The grinding fixture base 1 includes a base plate 12 and a processing plate 13. The base plate 12 has a right-angled fan-shaped structure, and the processing plate 13 has a circular structure. One side of the processing plate 13 is fixedly connected to the right angle of the base plate 12. The correction hole 11 is opened in the middle of the processing plate 13. There are two cover fixing components 2. The bottom of the fixing baffle 3 in the two cover fixing components 2 is perpendicularly connected to the two right-angled sides of the base plate 12.

[0041] The base plate 12 has multiple mounting slots 14 on its arc-shaped edge for fixed connection with the worktable of the grinding machine.

[0042] The positioning bolt 4 has semi-circular holes 42 on both sides of the screw head 41. The semi-circular holes 42 are fixedly connected to the fixing screw holes 33 on the fixing baffle 3 by the second screw 34.

[0043] The cover fixing assembly 2 also includes multiple pressure plates 5 and multiple first screws 6. The multiple pressure plates 5 are arranged around the outer periphery of the cover 9. One side of the pressure plate 5 rests on the cover teeth 94 on the outer circle of the cover. One side of the pressure plate 5 is provided with an arc surface 51 that fits against the outer circle step 95 of the cover 9. The other side of the pressure plate 5 is provided with a first pressing hole 52. The first pressing hole 52 and the second pressing hole 35 opened on the fixing baffle 3 are fixedly connected by the first screws 6.

[0044] The fixed baffle 3 has a rectangular structure. The number of pressure plates 5, screws 6, and second clamping holes 35 are all four, and the four second clamping holes 35 are respectively opened at the four corners of the fixed baffle 3.

[0045] A first long rib plate 7 and a first short rib plate 8 are provided between the base plate 12 and a fixed baffle 3. A second long rib plate 71 and a second short rib plate 81 are provided between the base plate 12 and another fixed baffle 3. The first long rib plate 7 and the second long rib plate 71 have the same structure, and both the first long rib plate 7 and the second long rib plate 71 are located close to the processing plate 13. The first short rib plate 8 and the second short rib plate 81 have the same structure.

[0046] A method for machining the inner hole of a cover arm for a curve mill, the method comprising the following steps:

[0047] S1. Place the grinding fixture base 1 on the worktable of the grinding machine, calibrate the calibration hole 11 to be coaxial with the rotation center of the grinding machine, and calibrate the mounting surface 31 of the fixing baffle 3 to be perpendicular to the worktable of the grinding machine; after calibration, fix the grinding fixture base 1 on the worktable of the grinding machine.

[0048] S2. First, install the positioning bolt 4 in the positioning hole 32 on the fixed baffle 3. Then, mate the end face 92 of the cover with the mounting surface 31 on the fixed baffle 3, and install the center hole 93 of the cover 9 on the positioning bolt 4. Tighten the nut on the positioning bolt 4 with a small tightening torque.

[0049] S3. Align the inner hole 91 of the rotating arm of the cover 9 with the rotation center of the grinding machine, and align the end face of the inner hole 91 of the rotating arm with the worktable surface of the grinding machine. After the alignment is completed, tighten the nut on the positioning bolt 4 with 100% tightening torque.

[0050] S4. Perform grinding of the inner hole 91 of the cover 9 rotating arm.

[0051] The positioning bolt 4 has semi-circular holes 42 on both sides of the screw head 41. The semi-circular holes 42 are fixedly connected to the fixing screw holes 33 on the fixing baffle 3 by the second screw 34.

[0052] In step S2, the semi-circular hole 42 on the screw head 41 of the positioning bolt 4 is fixedly connected to the fixing screw hole 33 on the fixing baffle 3 by the second screw 34, so that the positioning bolt 4 is installed in the positioning hole 32 on the fixing baffle 3.

[0053] The cover fixing assembly 2 also includes multiple pressure plates 5 and multiple screws 6. The multiple pressure plates 5 are arranged around the outer periphery of the cover 9. One side of the pressure plate 5 rests on the cover teeth 94 on the outer circle of the cover. One side of the pressure plate 5 is provided with an arc surface 51 that fits against the outer circle step 95 of the cover 9. The other side of the pressure plate 5 is provided with a first pressing hole 52. The first pressing hole 52 and the second pressing hole 35 opened on the fixing baffle 3 are fixedly connected by the first screw 6.

[0054] In step S3, after the calibration is completed, the arc surface 51 on one side of the pressure plate 5 is first fitted to the outer periphery of the cover 9, and the first pressing hole 52 on the pressure plate 5 is fixedly connected to the second pressing hole 35 on the fixed baffle 3 by the first screw 6. Finally, the nut on the positioning bolt 4 is tightened with 100% tightening torque.

[0055] Example 1:

[0056] See Figures 1 to 11 A grinding fixture for machining the inner hole of the cover arm of a curve mill includes a grinding fixture base 1 and a cover fixing assembly 2. The grinding fixture base 1 is set on the worktable of the grinding machine and includes a base plate 12 and a machining plate 13. The base plate 12 has a right-angled fan-shaped structure, and multiple mounting grooves 14 for fixed connection with the worktable of the grinding machine are opened on the arc-shaped edge of the base plate 12. The machining plate 13 has a circular structure, and one side of the machining plate 13 is fixedly connected to the base plate 12 at a right angle. A correction hole 11 coaxial with the inner hole 91 of the cover arm is opened in the middle of the machining plate 13. The number of cover fixing components 2 is two. The cover fixing components 2 include a fixing baffle 3 and a positioning bolt 4. The fixing baffle 3 is a rectangular structure. One side of the fixing baffle 3 in the two cover fixing components 2 is perpendicularly connected to the two right-angled sides of the base plate 12. One side of the fixing baffle 3 is provided with a mounting surface 31 that mates with the cover end face 92 of the cover 9. A positioning hole 32 is provided in the middle of the fixing baffle 3. The positioning hole 32 is fixedly connected to the center hole 93 of the cover 9 by the positioning bolt 4. Semi-circular holes 42 are provided on both sides of the screw head 41 of the positioning bolt 4. The semi-circular holes 42 are fixedly connected to the fixing screw holes 33 on the fixing baffle 3 by a second screw 34. The second screw 34 is an internal hexagon screw.

[0057] A method for machining the inner hole of the cover arm of a profile mill, based on the above-mentioned grinding fixture, includes the following specific steps:

[0058] S1. Place the grinding fixture base 1 on the worktable of the grinding machine, so that the bottom surface of the base plate 12 is flush with the worktable of the grinding machine, and a 0.02mm feeler gauge cannot be inserted; calibrate the calibration hole 11 to be coaxial with the rotation center of the grinding machine, and calibrate the mounting surface 31 of the fixing baffle 3 to be perpendicular to the worktable of the grinding machine; after calibration, fix the grinding fixture base 1 on the worktable of the grinding machine through the mounting groove 14.

[0059] S2. First, place the positioning bolt 4 in the positioning hole 32 on the fixed baffle 3. Then, fix the semi-circular hole 42 on the screw head 41 of the positioning bolt 4 to the fixing screw hole 33 on the fixed baffle 3 using the second screw 34. Next, install the cover 9 on the positioning bolt 4 through the center hole 93 and mate the end face 92 of the cover with the mounting surface 31 on the fixed baffle 3. A 0.02mm feeler gauge should not be able to penetrate. Tighten the nut on the positioning bolt 4 with a small tightening torque.

[0060] S3. Align the inner hole 91 of the rotating arm of the cover 9 with the rotation center of the grinding machine, and align the end face of the inner hole 91 of the rotating arm with the worktable surface of the grinding machine. After the alignment is completed, tighten the nut on the positioning bolt 4 with 100% tightening torque.

[0061] S4. Perform grinding of the inner hole 91 of the cover 9 rotating arm.

[0062] Example 2:

[0063] The difference from Example 1 is as follows:

[0064] The fixed baffle 3 is provided with a second pressing hole 35 at each of its four corners. The cover fixing assembly 2 also includes four pressure plates 5 and four first screws 6. The four pressure plates 5 are arranged around the outer periphery of the cover 9. One side of the pressure plate 5 rests on the cover teeth 94 on the outer circle of the cover. One side of the pressure plate 5 is provided with an arc surface 51 that fits against the outer circle step 95 of the cover 9. The other side of the pressure plate 5 is provided with a first pressing hole 52. The first pressing hole 52 and the second pressing hole 35 are fixedly connected by the first screws 6.

[0065] In step S3, after the calibration is completed, the arc surface 51 on one side of the pressure plate 5 is first pressed tightly against the outer peripheral step 95 of the cover 9. Then, the first pressing hole 52 on the pressure plate 5 is fixedly connected to the second pressing hole 35 on the fixed baffle 3 by the first screw 6. The cover 9 is pressed tightly onto the fixed baffle 3 by the pressure plate 5. Then, the nut on the positioning bolt 4 is tightened with 100% tightening torque to completely fix the cover 9.

[0066] Example 3:

[0067] The difference from Example 1 is as follows:

[0068] See Figure 12 , Figure 13A first long rib plate 7 and a first short rib plate 8 are provided between the base plate 12 and a fixed baffle 3. A second long rib plate 71 and a second short rib plate 81 are provided between the base plate 12 and another fixed baffle 3. The first long rib plate 7 and the second long rib plate 71 have the same structure. The first short rib plate 8 and the second short rib plate 81 have the same structure. The first long rib plate 7 and the second long rib plate 71 are both located close to the processing plate 13. The first long rib plate 7, the second long rib plate 71, the first short rib plate 8, and the second short rib plate 81 are used to enhance the overall structural rigidity of the grinding fixture base 1. The combination design of long rib plates and short rib plates is to avoid the problem of insufficient operating space when installing the positioning bolts 4.

Claims

1. A grinding fixture for machining the inner hole of the cover arm of a profile mill, characterized in that: The grinding fixture includes a grinding fixture base (1) and a cover fixing assembly (2). The grinding fixture base (1) is set on the worktable of the grinding machine. The grinding fixture base (1) has a correction hole (11) that is coaxial with the inner hole (91) of the rotating arm of the cover (9). The cover fixing assembly (2) includes a fixing baffle (3) and a positioning bolt (4). The bottom of the fixing baffle (3) is vertically connected to the grinding fixture base (1). A mounting surface (31) that matches the end face (92) of the cover (9) is provided on one side of the fixing baffle (3). A positioning hole (32) is provided in the middle of the fixing baffle (3). The positioning hole (32) is fixedly connected to the center hole (93) of the cover (9) by the positioning bolt (4). The grinding fixture base (1) includes a base plate (12) and a processing plate (13). The base plate (12) is a right-angled fan-shaped structure, and the processing plate (13) is a circular structure. One side of the processing plate (13) is fixedly connected to the base plate (12) at a right angle. The correction hole (11) is opened in the middle of the processing plate (13). There are two cover fixing components (2). The bottom of the fixing baffle (3) in the two cover fixing components (2) is perpendicularly connected to the two right-angled sides of the base plate (12). The positioning bolt (4) has semi-circular holes (42) on both sides of the screw head (41). The semi-circular holes (42) and the fixing screw holes (33) on the fixing baffle (3) are fixedly connected by the second screw (34). The cover fixing assembly (2) also includes multiple pressure plates (5) and multiple first screws (6). The multiple pressure plates (5) are arranged around the outer periphery of the cover (9). One side of the pressure plate (5) rests on the cover teeth (94) on the outer circle of the cover (9). One side of the pressure plate (5) is provided with an arc surface (51) that fits against the outer circle step (95) of the cover (9). The other side of the pressure plate (5) is provided with a first pressing hole (52). The first pressing hole (52) and the second pressing hole (35) opened on the fixed baffle (3) are fixedly connected by the first screws (6). A first long rib plate (7) and a first short rib plate (8) are provided between the base plate (12) and a fixed baffle (3). A second long rib plate (71) and a second short rib plate (81) are provided between the base plate (12) and another fixed baffle (3). The first long rib plate (7) and the second long rib plate (71) have the same structure, and both the first long rib plate (7) and the second long rib plate (71) are located close to the processing plate (13). The first short rib plate (8) and the second short rib plate (81) have the same structure.

2. The grinding fixture for the inner hole of the cover arm of a curve mill according to claim 1, characterized in that: The base plate (12) has multiple mounting slots (14) on its arc-shaped edge for fixed connection with the worktable of the grinding machine.

3. The grinding fixture for the inner hole of the cover arm of a curve mill according to claim 1, characterized in that: The fixed baffle (3) has a rectangular structure. The number of the pressure plate (5), the first screw (6), and the second clamping hole (35) are all four. The four second clamping holes (35) are respectively opened at the four corners of the fixed baffle (3).

4. A method for machining the inner hole of a cover arm for a curve mill, characterized in that: The processing method is based on the grinding fixture described in claim 1 and includes the following steps: S1. Place the grinding fixture base (1) on the worktable of the grinding machine, calibrate the calibration hole (11) to be coaxial with the rotation center of the grinding machine, and calibrate the mounting surface (31) of the fixing baffle (3) to be perpendicular to the worktable of the grinding machine; after calibration, fix the grinding fixture base (1) on the worktable of the grinding machine. S2. First, install the positioning bolt (4) in the positioning hole (32) on the fixed baffle (3), then match the end face (92) of the cover with the mounting surface (31) on the fixed baffle (3), and install the center hole (93) of the cover (9) on the positioning bolt (4). Tighten the nut on the positioning bolt (4) with a small tightening torque. S3. Align the inner hole (91) of the rotating arm of the cover (9) with the rotation center of the grinding machine, and align the end face of the inner hole (91) of the rotating arm with the worktable surface of the grinding machine. After the alignment is completed, tighten the nut on the positioning bolt (4) with 100% tightening torque. S4. Grinding is performed on the inner hole (91) of the cover (9) rotating arm.

5. The method for machining the inner hole of the cover arm of a curve mill according to claim 4, characterized in that: The positioning bolt (4) has semi-circular holes (42) on both sides of the screw head (41). The semi-circular holes (42) and the fixing screw holes (33) on the fixing baffle (3) are fixedly connected by the second screw (34). In step S2, the semi-circular hole (42) on the screw head (41) of the positioning bolt (4) is fixedly connected to the fixing screw hole (33) on the fixing baffle (3) by the second screw (34), so that the positioning bolt (4) is installed in the positioning hole (32) on the fixing baffle (3).

6. A method for machining the inner hole of a cover arm for a curve mill according to claim 4 or 5, characterized in that: The cover fixing assembly (2) also includes multiple pressure plates (5) and multiple first screws (6). The multiple pressure plates (5) are arranged around the outer periphery of the cover (9). One side of the pressure plate (5) rests on the cover teeth (94) on the outer circle of the cover (9). One side of the pressure plate (5) is provided with an arc surface (51) that fits against the outer circle step (95) of the cover (9). The other side of the pressure plate (5) is provided with a first pressing hole (52). The first pressing hole (52) and the second pressing hole (35) opened on the fixed baffle (3) are fixedly connected by the first screws (6). In step S3, after the calibration is completed, the arc surface (51) on one side of the pressure plate (5) is first attached to the outer periphery of the cover (9), and the first pressing hole (52) on the pressure plate (5) is fixedly connected to the second pressing hole (35) on the fixed baffle (3) by the first screw (6). Finally, the nut on the positioning bolt (4) is tightened with 100% tightening torque.

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