Automatic feeding and drilling device and method for shaft parts with holes

Abstract

This invention relates to an automatic feeding and drilling device for shaft-like parts with internal holes, comprising a cylinder, guide rod flange, fixed plate, guide rod, bracket, first V-block, angle plate, drill jig sleeve, drill template, first screw, second screw, second V-block, axial stop block, cylinder gasket ring, movable plate, guide plate, and base plate. The fixed plate, first V-block, angle plate, second V-block, and guide plate are respectively fixedly connected to the base plate. This invention also relates to an automatic feeding and drilling method for shaft-like parts with internal holes, including determining the positioning height of the V-block, the cylinder inner diameter and piston rod diameter, the angle plate tilt angle, the drill jig sleeve height and chip removal space, the axial distance of the drill jig sleeve, and the axial limiting distance. This invention features a positioning groove for the shaft-like parts. When the angle and outer diameter of the shaft-like parts with internal holes change, only the positioning plate and angle plate need to be replaced, achieving a modular design. This invention enables automatic feeding and automatic clamping and releasing.

Description

Technical Field

[0001] This invention belongs to the field of machining equipment manufacturing technology, specifically an automatic feeding and drilling device and method for shaft parts with internal holes. Background Technology

[0002] Chinese invention patent CN105215778A discloses an automatic feeding and clamping device for machining positioning grooves of small shaft parts. The invention includes: a feeding pipe, one end of which is an inlet and the other end is an outlet; an automatic feeding mechanism disposed below the outlet of the feeding pipe, which clamps the small shaft parts fed by the feeding pipe and pushes them upwards; an automatic clamping mechanism disposed above the automatic feeding mechanism, which clamps the small shaft parts pushed upwards by the automatic feeding mechanism, and simultaneously releases the clamp on the small shaft parts; and a PLC controller connected to both the automatic feeding mechanism and the automatic clamping mechanism. The advantages of this invention are: simplicity, reliability, and low cost. A self-made device with a PLC can achieve automatic loading and unloading and automatic clamping, reducing labor intensity and effectively improving labor efficiency. However, it has the drawback of not being able to automatically pick up materials.

[0003] Chinese invention patent CN103303670A discloses a feeding device and method for connecting rod processing. The feeding device includes an upper feeding channel, an lower feeding channel, and a loading / unloading fixture located between the upper and lower feeding channels; and a robot located on one side of the loading / unloading fixture. The loading / unloading fixture includes a horizontal cylinder, a horizontal gripper, a horizontal fixing frame, a clamping mechanism, a workpiece position seat, a lowering cylinder, and a lowering push plate. The workpiece position seat has at least one front workpiece slot and an equal number of rear workpiece slots, which are arranged parallel to each other. The horizontal gripper has a built-in first gravity sensor. The horizontal cylinder drives the horizontal gripper to slide laterally along the horizontal fixing frame. The lowering push plate is located between the front and rear workpiece slots and is fixed to the lowering cylinder, which is located on one side of the front end of the lower feeding channel. However, this patent also has the drawback of not being able to automatically grip.

[0004] With the advancement of automation, the original manual drilling fixtures are no longer suitable. An automatic feeding device is needed to simultaneously achieve automatic oil hole drilling and allow the articulated robot gripper to grasp the parts. To overcome this technological hurdle, an automatic feeding and drilling device and design method for shaft-type parts with internal holes were developed. This device can achieve automatic feeding, automatic oil hole drilling, and part grasping by the articulated robot. Standardized design is achieved; when the angle and outer diameter of the shaft-type parts with internal holes change, modular design is realized by simply replacing the positioning plate and angle plate. Summary of the Invention

[0005] To overcome the limitations of automatic clamping and automatic feeding in the machining of shaft parts with internal holes, this invention proposes an automatic feeding and drilling device and method for shaft parts with internal holes.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] An automatic feeding and drilling device for shaft-type parts with internal holes includes a cylinder, a guide rod flange, a fixing plate, a guide rod, a bracket, a first V-block, an angle plate, a drill jig sleeve, a drill template, a first screw, a second screw, a second V-block, an axial stop block, a cylinder gasket ring, a movable plate, a guide plate, and a base plate.

[0008] The cylinder is mounted on the fixed plate, the guide rod flange is fixedly connected to the fixed plate, the guide rod is fixedly connected to the movable plate, the bracket is fixedly connected to the movable plate by screws, the drill jig is fixed on the drill template, the second V-block is mounted on the axial stop block, and the cylinder gasket ring is fixedly connected to the movable plate by threads.

[0009] The fixed plate, the first V-block, the angle plate, the second V-block, and the guide plate are fixedly connected to the base plate.

[0010] In the aforementioned automatic feeding and drilling device for shaft-type parts with internal holes, the drill jig sleeve and the drill template are interference-fitted, and the drill template is connected to the second V-block via a first screw. The guide plate is connected to the base plate, the angle plate is connected to the base plate via a second screw, and the guide rod flange and the guide rod are clearance-fitted. During automatic feeding, the bracket can move with the cylinder.

[0011] In the aforementioned automatic feeding and drilling device for shaft parts with internal holes, the inner hole and outer circle of the guide rod flange have a coaxiality of Φ0.005mm, and are evenly distributed with 4-Φ5.5mm stepped holes.

[0012] The fixing plate has three through holes on its side. The middle hole (Φ28mm) is for mounting a cylinder, the left hole (Φ40mm) is for mounting a guide rod flange, and the right hole (Φ40mm) is for mounting a guide rod flange. The bottom surface of the fixing plate has 6 M6 threaded holes.

[0013] The bracket end face is provided with 2-M6 threaded holes.

[0014] The first V-block has a spindle diameter of Φ50.3, 2 M8 threaded holes on the bottom surface, and a 90° V-groove on the vertical bottom surface.

[0015] Two M8 threaded holes are provided on the inclined surface of the angle plate.

[0016] The drill jig sleeve has an outer diameter of 8mm and has 4 holes and 2 locating pin holes on a 20° surface.

[0017] The second V-block has a spindle diameter of Φ60.3, 2 M8 threaded holes on the bottom surface, and a 60° V-groove on the vertical bottom surface.

[0018] The parallelism between the axial stop limiting surface and the reference surface is 0.005mm, and a Φ7 stepped hole is provided.

[0019] The guide plate has a positioning end face roughness of 1.6μm, a straightness of 0.008mm, and an M6 thread on its bottom surface.

[0020] An automatic feeding and drilling method for shaft-type parts with internal holes, utilizing an automatic feeding and drilling device for shaft-type parts with internal holes, includes the following steps:

[0021] Step 1: Determine the positioning height of the V-block.

[0022] The V-block consists of a first V-block and a second V-block. The positioning height T of the V-block is determined based on the mandrel diameter of the V-block, and the specific calculation is as follows:

[0023] T=H+0.5(d / sin(α / 2)-N / tan(α / 2)) (1)

[0024] In equation (1), H is the height of the V-block, d is the design mandrel diameter of the V-block, α is the angle between the two working planes of the V-block, and N is the opening length of the V-block.

[0025] Step 2: Determine the cylinder inner diameter and piston rod diameter.

[0026] Based on the external clamping force and the cylinder's operating parameters, the cylinder's inner diameter D is calculated as follows:

[0027]

[0028] In equation (2), F1 is the thrust of the piston rod in N; P is the working pressure of the cylinder in Pa; and η is the load factor.

[0029] The piston rod diameter d is determined based on the cylinder inner diameter D, specifically as follows:

[0030] d=bD (3)

[0031] In equation (3), b is a relative coefficient.

[0032] Step 3, determine the tilt angle of the angle plate

[0033] Based on a drilling angle of 70°, calculate the inclination angle of the angle plate. The inclination angle of the angle plate is complementary to the drilling angle.

[0034] Step 4: Determine the height of the drill jig and the chip removal space.

[0035] Based on the borehole diameter d0, determine the height H2 of the drill jig and the height h2 of the chip removal space.

[0036] Step 5: Determine the axial distance of the drill jig sleeve.

[0037] Based on the chip removal space height h2, calculate the axial distance Y of the drill jig sleeve as follows:

[0038] Y = X - h² / tanβ (4)

[0039] In equation (4), X is the axial distance of the oil hole and β is the angle of the oil hole.

[0040] Step 6, determine the axial limit distance.

[0041] Calculate the axial limiting distance U based on the tooth thickness width V.

[0042] Step 7: The articulated robot gripper grasps the outer diameter of the shaft-like part with an inner hole and places the part on the bracket. The cylinder pushes the bracket to move, and the outer diameter is positioned by the first V-shaped and second V-shaped positioning. Axial positioning is achieved through the guide plate. After pushing to the axial stop, the cylinder stops working. The drilling machine automatically starts processing, and the drill bit processes the oil hole through the drilling template. After processing is completed, the cylinder moves the bracket, the part is released, and the articulated robot grasps the part.

[0043] In the above-mentioned automatic feeding and drilling method for shaft parts with internal holes, in step 1 of determining the positioning height of the V-block, the mandrel diameters of the first V-block and the second V-block are Φ50.3mm and Φ60.3mm, respectively.

[0044] In the above-mentioned automatic feeding and drilling method for shaft parts with internal holes, in step 2, when determining the cylinder inner diameter and piston rod diameter, the load factor η = 0.3 to 0.5 and the relative coefficient b = 0.2 to 0.3.

[0045] In the above-mentioned automatic feeding and drilling method for shaft parts with internal holes, in step 3, the drilling angle is 70° and the angle plate tilt angle is 20°.

[0046] In the above-mentioned automatic feeding and drilling method for shaft parts with internal holes, step 4, determining the height of the drill jig and the chip removal space, is specifically calculated as follows:

[0047] The height H2 of the drill jig sleeve is calculated as follows:

[0048] H2=(1~2.5)d0 (5)

[0049] The chip removal space height h2 is calculated as follows:

[0050] h2=(0.7~1.5)d0 (6)

[0051] In the above-mentioned automatic feeding and drilling method for shaft parts with internal holes, in step 6, the axial limiting distance U is:

[0052] U = V + 0.8 (7)

[0053] In equation (7), the unit is mm.

[0054] The above-mentioned automatic feeding and drilling method for shaft parts with internal holes can adapt to changes in the angle and outer diameter of shaft parts with internal holes by changing the positioning plate and angle plate.

[0055] The beneficial effects of this invention are:

[0056] An automatic feeding and drilling device for shaft parts with internal holes is provided. The device is equipped with a positioning groove for the shaft parts. When the angle and outer diameter of the shaft parts with internal holes change, only the positioning plate and the angle plate need to be replaced to achieve modular design.

[0057] An automatic feeding and drilling device for shaft-type parts with internal holes is used to drill oil holes on the outer cylindrical surface of shaft-type parts with internal holes. It can automatically clamp and release, and the articulated robot can grasp the parts. Attached Figure Description

[0058] Figure 1 This is a front view of the device of the present invention;

[0059] Figure 2 This is a top view of the device of the present invention;

[0060] Figure 3 This is a cross-sectional view of the device of the present invention along the axial direction of the part;

[0061] Figure 4 It is an isometric drawing of the guide rod flange;

[0062] Figure 5 This is the front view of the guide rod flange;

[0063] Figure 6 This is a sectional view of the guide rod flange;

[0064] Figure 7 This is the left view of the fixed plate;

[0065] Figure 8 This is the main view of the fixed plate;

[0066] Figure 9 This is the right view of the fixed plate;

[0067] Figure 10 This is the main view of the guide rod;

[0068] Figure 11 This is the right view of the guide rod;

[0069] Figure 12It is an isometric drawing of the bracket;

[0070] Figure 13 This is the front view of the bracket;

[0071] Figure 14 This is the right view of the bracket;

[0072] Figure 15 This is the first V-shaped isometric drawing;

[0073] Figure 16 This is the right view of the first V-shape;

[0074] Figure 17 This is the first V-shaped main view;

[0075] Figure 18 This is an angle plate axis view;

[0076] Figure 19 This is the main view of the angle plate;

[0077] Figure 20 This is a top view of the angle plate;

[0078] Figure 21 This is the left view of the angle plate;

[0079] Figure 22 This is the main view of the drill jig;

[0080] Figure 23 This is a cross-sectional view of the drill jig sleeve along its centerline;

[0081] Figure 24 This is the main view of the activity board;

[0082] Figure 25 yes Figure 24 Cross-sectional view of FF in the middle;

[0083] Figure 26 It is a 3D view of the guide plate;

[0084] Figure 27 This is the main view of the guide plate;

[0085] Figure 28 yes Figure 27 Cross-sectional view of the middle section (BB);

[0086] Figure 29 This is the main view of the base plate;

[0087] Figure 30 yes Figure 29 Cross-sectional view of the middle CC section.

[0088] In the diagram: 1. Cylinder; 2. Guide rod flange; 3. Fixing plate; 4. Guide rod; 5. Bracket; 6. First V-block; 7. Angle plate; 8. Drill jig sleeve; 9. Drill template; 10. First screw; 11. Second screw; 12. Second V-block; 13. Axial stop; 14. Cylinder gasket ring; 15. Movable plate; 16. Guide plate; 17. Base plate. Detailed Implementation

[0089] Example 1

[0090] An automatic feeding and drilling device for shaft-type parts with internal holes, such as Figure 1 , Figure 2 , Figure 3 As shown, the main structure includes: cylinder 1, guide rod flange 2, fixing plate 3, guide rod 4, bracket 5, first V-block 6, angle plate 7, drill jig sleeve 8, drill template 9, first screw 10, second screw 11, second V-block 12, axial stop block 13, cylinder gasket ring 14, movable plate 15, guide plate 16, and base plate 17.

[0091] like Figure 2 As shown, the piston rod of cylinder 1 is connected to cylinder head gasket 14 via threads. Cylinder head gasket 14, movable plate 15, and bracket 5 are connected via threads. The first V-block 6 and the second V-block 12 are connected to the base plate 17 via screws. Drill jig sleeve 8 and drill template 9 are interference-fitted, and drill template 9 is connected to the second V-block 12 via screws. Guide plate 16 is connected to the base plate 17 via threads. Angle plate 7 is connected to the base plate 17 via screws. Guide rod flange 2 and guide rod 4 are clearance-fitted, allowing bracket 5 to move with cylinder 1 during automatic feeding.

[0092] like Figures 4 to 23As shown, the inner and outer diameters of the guide rod flange 2 are coaxial with a diameter of Φ0.005mm, and it is connected to the fixed plate 3 through 4 evenly distributed Φ5.5mm stepped holes. The fixed plate 3 has three through holes machined on the same axis: a Φ28mm hole in the middle for mounting the cylinder 1, a Φ40mm hole on the left for mounting the guide rod flange 2, and a Φ40mm hole on the right for mounting the guide rod flange 2. The bottom surface of the fixed plate 3 is machined with 6-M6 threads and fixed to the base plate 17 with screws. The end face of the guide rod 4 is machined with M8 threaded holes and connected to the movable plate 15 with screws. The outer diameter roughness of the guide rod 4 is 1.6μm, and the outer diameter runout is 0.005mm. The bracket 5 is designed with an R25 arc for positioning with the outer diameter of the part, and the end face of the bracket 5 is machined with 2-M6 threaded holes. It is connected to the movable plate 15 with screws. The spindle diameter of the first V-block 6 is Φ50.3mm, i.e., a Φ50.3mm V-shape. Two M8 threaded holes are machined on the bottom surface of the Φ50.3mm V-block 6, which is connected to the base plate 17 by screws. A 90° V-shape is machined on the vertical bottom surface to clamp the Φ50.3mm outer diameter. The angle plate 7 is designed with an angle complement of 90°-70°=20° to the required angle of the part. Two M8 threads are machined on the inclined surface of the angle plate 7, which is connected to the base plate 17 by screws. A 10mm wide U-shaped groove is machined on the angle plate 7 to facilitate adjustment when connecting the device to a drilling machine. The drill jig sleeve 8 has an outer diameter of 8mm and an inner hole size of diameter + 0.25mm. The drill template 9 has four holes machined on its 20° surface, including two locating pin holes, one stepped hole for fixing the drill template 9, and one hole for installing the drill jig sleeve 8. The spindle diameter of the second V-block 12 is Φ60.3mm, i.e., a Φ60.3mm V-shape. Two M8 threaded holes are machined on the bottom surface of the Φ60.3mm V-block 12, which is connected to the base plate 17 by screws. A 60° V-shape is machined on the vertical bottom surface to clamp the Φ60.3mm outer diameter. The axial stop 13 has an axial limiting distance of 12mm, and the parallelism between the limiting surface and the reference surface is 0.005mm. A Φ7 stepped hole is machined for installation on the Φ60.3mm V-shape second V-block 12. The cylinder gasket ring 14 has a stepped hole and is connected to the movable plate 15 by threads. The cylinder 1 drives the cylinder gasket ring 14 through the threads, causing the movable plate 15 to move. The guide plate 16 has a positioning end face roughness of 1.6μm and a straightness of 0.008mm. An M6 thread is machined on the bottom surface to connect it to the base plate 17.

[0093] An automatic feeding and drilling device for shaft-type parts with internal holes is provided for drilling oil holes on the outer circular surface of shaft-type parts with internal holes. The device can automatically clamp and release, making it convenient for articulated robots to grasp the parts.

[0094] An automatic feeding and drilling method for shafts with internal holes is disclosed. This method is used to drill oil holes on the outer cylindrical surface of shaft-type parts with internal holes. The automatic feeding and drilling device can be used to process shaft-type parts with internal holes at different angles, and can also be applied to the verification of automatic feeding and drilling devices. The specific steps are as follows:

[0095] Step 1: Determine the positioning height of the clamping V-block.

[0096] Calculate the positioning height of the V-block based on the positioning dimensions of the outer diameter Φ50.3 and Φ60.3:

[0097] T=H+0.5(d / sin(α / 2)-N / tan(α / 2))

[0098] Wherein, d—the design mandrel diameter of the V-shaped block;

[0099] α—The angle between the two working planes of the V-block;

[0100] H—Height of the V-shaped block;

[0101] The positioning height of the T-V block;

[0102] The opening size of the N-V block.

[0103] Step 2: Determine the cylinder inner diameter and piston rod diameter.

[0104] Calculate the inner diameter D of the double-acting cylinder and the piston rod diameter d based on the clamping force on the outer circle.

[0105]

[0106] d / D = 0.2–0.3

[0107] Wherein, F1 is the thrust of the piston rod (N);

[0108] P—Cylinder working pressure (Pa);

[0109] η—load factor, typically taken as 0.3 to 0.5.

[0110] Step 3, determine the tilt angle of angle plate 7.

[0111] Based on the drilling angle of 70°, calculate the tilt angle of the angle plate. The tilt angle of the angle plate is complementary to the drilling angle: 90° - 70° = 20°.

[0112] Step 4: Determine the height of the drill jig and the chip removal space.

[0113] Calculate the drill jig height H2 and the chip removal space h2 based on the borehole diameter d0.

[0114] H2=(1~2.5)d0

[0115] h2=(0.7~1.5)d0

[0116] Step 5, determine the axial distance Y of the drill jig sleeve.

[0117] Calculate the axial distance Y of the drill jig sleeve based on the chip removal space h2.

[0118] Y = X - h² / tanβ

[0119] Where X is the axial distance of the oil hole;

[0120] h2—Chip removal space;

[0121] β—oil hole angle.

[0122] Step 6, determine the axial limit distance.

[0123] The axial limiting distance U is calculated as follows:

[0124] U = V + 0.8mm

[0125] Wherein, V represents the tooth thickness width.

[0126] A design method for an automatic feeding and drilling device for shaft-type parts with internal holes is disclosed. This device automates loading and unloading, simultaneously drilling oil holes, and requires an articulated robotic gripper to grasp the parts. This device solves the challenges of automation upgrades, replaces manual loading and unloading, and ensures consistent clamping force to guarantee machining quality.

[0127] Working Principle: An automatic feeding and drilling device for shafts with internal holes. Before processing, the articulated robot gripper grasps the outer diameter of the shaft-like part with an internal hole. The part is placed on the support 5, and the cylinder 1 pushes the support 5 to move. The outer diameter is positioned by the first V-shaped guide 6 and the second V-shaped guide 12, and axial positioning is achieved through the guide plate 16. After being pushed to the axial stop 13, the cylinder stops working. The drilling machine automatically starts processing, and the drill bit processes a Φ3mm diameter oil hole at 70° through the drilling template 9. After processing is completed, the cylinder 1 moves the support 5, the part is released, the articulated robot grips the part, and the processing is repeated.

[0128] Because of the angle of the angle plate 7, the gravity of the shaft-like part with the inner hole is decomposed into a force F1 perpendicular to the base plate 17 and a force F2 horizontal to the base plate 17. F2 causes the end face of the shaft-like part with the inner hole to contact the end face of the guide plate 16. To limit the axial movement of the shaft-like part with the inner hole, the cylinder stops working after the axial stop block 13 is pushed. At this time, the drill jig sleeve 8 is exactly in the vertical direction, thus realizing the drilling machine processing.

Claims

1. An automatic feeding and drilling method for shaft parts with internal holes, using an automatic feeding and drilling device for shaft parts with internal holes, the automatic feeding and drilling device for shaft parts with internal holes comprising a cylinder (1), a guide rod flange (2), a fixing plate (3), a guide rod (4), a bracket (5), a first V-block (6), an angle plate (7), a drill jig sleeve (8), a drill template (9), a first screw (10), a second screw (11), a second V-block (12), an axial stop (13), a cylinder gasket ring (14), a movable plate (15), a guide plate (16), and a base plate (17); The cylinder (1) is mounted on the fixed plate (3), the guide rod flange (2) is fixedly connected to the fixed plate (3), the guide rod (4) is fixedly connected to the movable plate (15), the bracket (5) is fixedly connected to the movable plate (15), the drill jig sleeve (8) is fixed on the drill template (9), the second V-block (12) is mounted on the axial stop block (13), and the cylinder gasket ring (14) is fixedly connected to the movable plate (15). The fixing plate (3), the first V-block (6), the angle plate (7), the second V-block (12), and the guide plate (16) are fixedly connected to the base plate (17) respectively; Its features are, Includes the following steps: Step 1, determine the positioning height of the V-block: The V-block includes a first V-block (6) and a second V-block (12); the positioning height T of the V-block is determined according to the mandrel diameter of the V-block, and the specific calculation is as follows: T=H+0.5(d / sin(α / 2)-N / tan(α / 2)) (1); In formula (1), H is the height of the V-block, d is the design mandrel diameter of the V-block, α is the angle between the two working planes of the V-block, and N is the opening length of the V-block; Step 2, determine the cylinder inner diameter and piston rod diameter: Based on the external clamping force and the cylinder's operating parameters, the cylinder's inner diameter D is calculated as follows: D= （2）； In equation (2), F1 is the thrust of the piston rod, in N; P is the working pressure of the cylinder, in Pa; and η is the load factor. The piston rod diameter d is determined based on the cylinder inner diameter D, specifically as follows: d=bD (3; In equation (3), b is a relative coefficient; Step 3, determine the tilt angle of the angle plate: Based on the drilling angle of 70°, calculate the tilt angle of the angle plate (7). The tilt angle of the angle plate (7) and the drilling angle are complementary angles. Step 4, determine the height of the drill jig and the chip removal space: Based on the borehole diameter d0, determine the height H2 of the drill jig sleeve (8) and the height h2 of the chip removal space; Step 5, determine the axial distance of the drill jig sleeve: Based on the height h2 of the chip removal space, the axial distance Y of the drill jig sleeve (8) is calculated as follows: Y = X - h2 / tanβ (4; In equation (4), X is the axial distance of the oil hole, and β is the angle of the oil hole; Step 6, determine the axial limit distance: Calculate the axial limiting distance U based on the tooth thickness width V; Step 7: The articulated robot gripper grasps the outer circle of the shaft-like part with an inner hole and places the part on the bracket (5). The cylinder (1) pushes the bracket (5) to move. The outer circle is positioned by the first V-block (6) and the second V-block (12). Axial positioning is achieved by the guide plate (16). After pushing to the axial stop (13), the cylinder stops working. The drilling machine automatically starts processing. The drill bit processes the oil hole through the drilling template (9). After processing is completed, the cylinder (1) moves the bracket (5), the part is released, and the articulated robot grasps the part.

2. The automatic feeding and drilling method for shaft parts with internal holes according to claim 1, characterized in that, In step 1, when determining the positioning height of the V-block, the spindle diameters of the first V-block (6) and the second V-block (12) are 50.3 mm and 60.3 mm, respectively.

3. The automatic feeding and drilling method for shaft parts with internal holes according to claim 1 or 2, characterized in that, In step 2, when determining the cylinder inner diameter and piston rod diameter, the load factor η = 0.3~0.5 and the relative coefficient b = 0.2~0.

3.

4. The automatic feeding and drilling method for shaft parts with internal holes according to claim 3, characterized in that, In step 3, the drilling angle is 70° and the tilt angle of the angle plate (7) is 20°.

5. The automatic feeding and drilling method for shaft parts with internal holes according to claim 4, characterized in that, In step 4, determining the drill jig height and chip removal space involves the following specific calculations: The height H2 of the drill jig sleeve is calculated as follows: H2 = (1~2.5)d0 (5); The chip removal space height h2 is calculated as follows: h2 = (0.7~1.5)d0 (6).

6. The automatic feeding and drilling method for shaft parts with internal holes according to claim 5, characterized in that, In step 6, the axial limiting distance U is determined as follows: U = V + 0.8 (7); In equation (7), the unit is mm.

7. The automatic feeding and drilling method for shaft parts with internal holes according to claim 6, characterized in that, The first V-block (6) and the second V-block (12), the bracket (5) and the angle plate are replaced to accommodate changes in the angle and outer diameter of shaft parts with internal holes.

8. The automatic feeding and drilling method for shaft parts with internal holes according to claim 1, characterized in that, The drill jig sleeve (8) is interference-fitted with the drill template (9), and the drill template (9) is connected to the second V-block by the first screw (10); the guide plate (16) is connected to the base plate (17), and the angle plate (7) is connected to the base plate (17) by the second screw (11); the guide rod flange (2) and the guide rod (4) are clearance-fitted; during automatic feeding, the bracket (5) can move with the cylinder (1).

9. The automatic feeding and drilling method for shaft parts with internal holes according to claim 1, characterized in that, The inner hole and outer circle of the guide rod flange (2) are coaxial with Φ0.005mm, and four Φ5.5mm stepped holes are evenly distributed. The fixing plate (3) has three through holes on its side, of which the cylinder (1) is installed in the middle Φ28mm, the guide rod flange (2) is installed in the left Φ40mm, and the guide rod flange (2) is installed in the right Φ40mm; the fixing plate (3) has six M6 threaded holes on its bottom surface. The bracket (5) has two M6 threaded holes on its end face; The first V-block has a spindle diameter of 50.3 mm, two M8 threaded holes on the bottom surface, and a 90° V-groove on the vertical bottom surface; Two M8 threaded holes are provided on the inclined surface of the angle plate (7); The drill jig sleeve (8) has an outer diameter of 8mm and four holes and two positioning pin holes are provided on the 20° surface; The second V-block (12) has a spindle diameter of 60.3 mm, two M8 threaded holes on the bottom surface, and a 60° V-groove on the vertical bottom surface; The axial stop (13) has a parallelism of 0.005mm between its limiting surface and the reference surface, and is provided with a Φ7 stepped hole; The guide plate (16) has a positioning end face roughness of 1.6µm, a straightness of 0.008mm, and an M6 thread on its bottom surface.

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