Long shaft center hole machining equipment

Abstract

The utility model provides long shaft center hole machining equipment, and belongs to the technical field of machine tools. The technical problem that an existing long shaft center hole machining device is low in efficiency is solved. Long-axis center hole machining equipment comprises a lathe bed assembly, a front motorized spindle assembly is fixedly connected to the lathe bed assembly, the lathe bed assembly comprises a lathe frame, an inclined slope is arranged on the upper portion of the lathe frame, two Z-axis linear rails are arranged on the inclined slope in an up-down parallel mode, and a Z-axis servo motor and a center-axis servo motor are located between the two Z-axis linear rails. The Z-axis servo motor is connected with the Z-axis lead screw, the center-axis servo motor is connected with the center-axis lead screw, the Z-axis servo motor and the center-axis servo motor are arranged on the left side and the right side of the bed frame respectively, the axial direction of the Z-axis lead screw is parallel to the axial direction of the center-axis lead screw, the Z-axis lead screw is in spiral sliding connection with a large carriage assembly, and the large carriage assembly is in sliding connection with a small carriage assembly. According to the utility model, the concentricity and smoothness of the processed long shaft are improved, the processing efficiency is improved, and the processing cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of machine tool technology, and specifically refers to a long shaft center hole machining equipment. Background Technology

[0002] In the machining industry, the processing of shaft-type workpieces is very common. Before machining shaft-type workpieces, an auxiliary process is usually required: drilling center holes at both ends of the shaft. This process is crucial for subsequent machining because it affects the overall machining accuracy and efficiency of the shaft part. During the machining of long shafts, factors such as radial cutting forces, self-weight, and centrifugal forces can cause bending and vibration, which in turn affects the machining accuracy of the center holes. Furthermore, the long shaft blank itself may have issues such as being crooked, irregular, or rough, which also increases the machining difficulty and errors.

[0003] In existing technologies, traditional machining methods (such as lathes and drilling machines) have many limitations in machining the center hole of long shafts. For example, they require multiple clamping and alignment operations, making the process complex and time-consuming. Furthermore, due to the characteristics of long shafts, frequent adjustments to equipment parameters are necessary during machining, further reducing efficiency. The travel limitations of existing CNC lathes may prevent the full machining of long shafts, while ordinary drilling machines may fail to guarantee machining accuracy due to unstable clamping or difficulty in alignment. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a long shaft center hole machining device. The technical problem this invention aims to solve is how to provide a device capable of effectively machining ultra-long pin shaft center holes.

[0005] The objective of this utility model can be achieved through the following technical solution: A long-axis center hole machining equipment includes a bed assembly, a front electric spindle assembly fixedly connected to the bed assembly, the front electric spindle assembly including a three-jaw chuck, the bed assembly including but not limited to a bed frame, a Z-axis servo motor, a Z-axis motor base, a Z-axis lead screw, a Z-axis mounting base, a central axis servo motor, a central axis motor base, a central axis lead screw, a central axis mounting base, and Z-axis linear guides, the upper part of the bed frame has an inclined surface, two Z-axis linear guides are arranged vertically parallel on the inclined surface, the Z-axis servo motor and the central axis servo motor are located between the two Z-axis linear guides, the Z-axis servo motor is connected to the Z-axis lead screw... The machine tool consists of a central axis servo motor connected to a central axis lead screw, a Z-axis servo motor and a central axis servo motor respectively located on the left and right sides of the machine tool frame, and the axes of the Z-axis lead screw and the central axis lead screw parallel to each other. A large slide assembly is helically slidably connected to the Z-axis lead screw, and a small slide assembly is slidably connected to the large slide assembly. The small slide assembly includes a small slide frame and a tool holder fixed on the small slide frame. A hydraulic central support and an auxiliary feeding support are fixedly connected to the large slide assembly. The auxiliary feeding support and the hydraulic central support are arranged opposite to each other, and the hydraulic central support and the tool holder are arranged opposite to each other. A rear electric spindle assembly is helically slidably connected to the central axis lead screw, and the rear electric spindle assembly includes a central spindle.

[0006] The three-jaw chuck of the front electric spindle assembly and the central spindle of the rear electric spindle assembly are both integrated into the same bed assembly. The front and rear electric spindle assemblies achieve synchronous Z-axis movement via the same two Z-axis rails, avoiding repetitive positioning errors caused by traditional multi-machine sequence operation. The three-jaw chuck, auxiliary loading support, and hydraulic center rest provide "three-point support" for the long spindle, suppressing deflection caused by its own weight or cutting force and ensuring the straightness of the machining axis. The Z-axis servo motor drives the large slide assembly to move along the Z-axis rails, covering the entire machining stroke of the long spindle, breaking through the stroke limitations of traditional equipment. The rear electric spindle assembly is independently driven for Z-axis feed, ensuring the center drill cuts into the workpiece with constant pressure and speed, avoiding hole diameter deviations or surface roughness caused by manual operation.

[0007] Furthermore, the large slide frame includes a stepped, progressively rising first mounting section, a second mounting section, and a third mounting section. An auxiliary feeding bracket is fixedly connected to the first mounting section. An X-axis servo motor is fixedly connected to the second mounting section, and the X-axis servo motor is connected to an X-axis lead screw. An X-axis linear guide is fixedly connected to the third mounting section. The X-axis lead screw and the X-axis linear guide connect to the small slide assembly. A center frame bracket is fixedly connected to the right side of the third mounting section. The center frame bracket extends upwards and exceeds the small slide frame. A center frame fixing part protrudes from the upper part of the center frame bracket towards the small slide frame, and the center frame fixing part is fixedly connected to a hydraulic center frame. The X-axis servo motor controls the radial feed of the small slide assembly. Combined with the tool's finishing of the long shaft end face, such as a flat end face, it provides a reference surface for subsequent center hole machining, reducing the impact of blank irregularities on concentricity.

[0008] Furthermore, an angle cylinder bracket is fixedly installed at the upper end of the center frame fixing part, and a rotary device is fixedly connected to the angle cylinder bracket, which is connected to the positioning device. One end of the long shaft is held by a three-jaw chuck, and the other end is supported by an auxiliary feeding bracket. The positioning device automatically retracts and rotates to the machining center line, reducing manual alignment time. After machining is completed, the rear electric spindle assembly automatically returns to the safety point, realizing a continuous machining process and improving efficiency.

[0009] Furthermore, the rear electric spindle assembly includes, but is not limited to, a rear electric spindle box, a central spindle, a central drill, and a rear electric spindle Z-axis slider. The rear electric spindle Z-axis slider is slidably connected to the Z-axis rail. The rear electric spindle box is fixedly connected to the rear electric spindle Z-axis slider. The central spindle is fixedly connected to the upper end of the rear electric spindle box. The central drill is connected inside the central spindle.

[0010] Furthermore, the positioning device includes a positioning arm and a positioning pin fixed to the end of the positioning arm. The positioning pin rotates and is aligned with or away from the axis of the center drill.

[0011] Furthermore, a hydraulic center frame is fixedly connected to the left side of the center frame fixing part. The hydraulic center frame includes a hydraulic cylinder and a hydraulic gripper, with the hydraulic gripper located below the rotary device. The rotary device drives the positioning pin to rotate until it is aligned with the axis of the center drill, achieving rapid alignment of the long shaft end face and eliminating the initial error caused by the non-straightness of the blank. After positioning, the hydraulic center frame and the three-jaw chuck clamp the long shaft one after the other, forming a rigid fixation and reducing vibration interference.

[0012] Furthermore, the small slide frame is shaped like the number 7. The longer part is the slider fixing part, and the fixed seat mounting part is perpendicular to the slider fixing part. The lower end face of the slider fixing part is fixedly connected to the X-axis slider, and the X-axis slider is slidably connected to the X-axis axis rail. The lower end face of the fixed seat mounting part is fixedly connected to the X-axis fixed seat, and the X-axis fixed seat is screwed to the X-axis lead screw. The upper end face of the fixed seat mounting part is fixedly connected to the tool holder on the side away from the hydraulic center frame, and the tool holder is fixedly connected to the tool.

[0013] Furthermore, the front electric spindle assembly includes, but is not limited to, the front electric spindle box, three-jaw chuck, front motor spindle, disc motor spindle, rotary cylinder, and water collection box. There is an installation gap between the lower end of the front electric spindle box and the bed frame, and the Z-axis servo motor is located between the lower end of the front electric spindle box and the bed frame.

[0014] Furthermore, the central spindle rotates in the opposite direction to the front motor spindle. This counter-rotation of the central spindle relative to the front motor spindle can counteract the radial force during the cutting process, reduce bending deformation of the long shaft, ensure machining stability, and improve surface finish.

[0015] Compared with the prior art, the technical effects of this utility model are as follows: through the integrated structure, multi-axis servo linkage and high-rigidity clamping system, the concentricity and surface finish of the long shaft are improved, the processing efficiency is increased and the processing cost is reduced. Attached Figure Description

[0016] Figure 1 This is the front view of this utility model.

[0017] Figure 2 This is a perspective view of the utility model.

[0018] Figure 3 This is a perspective view of the utility model assembly without the small slide plate.

[0019] Figure 4 This is a left view of the large slide assembly and the small slide assembly of this utility model.

[0020] Figure 5 This utility model relates to a three-dimensional large slide assembly and a small slide assembly. Figure 1 .

[0021] Figure 6 This utility model relates to a three-dimensional large slide assembly and a small slide assembly. Figure 2 .

[0022] Drawing number markings: 1. Bed assembly; 101. Bed frame; 102. Z-axis servo motor; 103. Z-axis motor base; 104. Z-axis lead screw; 105. Z-axis mounting bracket; 106. Central axis servo motor; 107. Central axis motor base; 108. Central axis lead screw; 109. Central axis mounting bracket; 110. Z-axis linear guide; 2. Front electric spindle assembly; 201. Front electric spindle box; 202. Three-jaw chuck; 203. Front motor spindle; 3. Large carriage assembly; 301. Large carriage frame; 3011. First mounting part; 3012. Second mounting part; 3013. Third mounting part; 302. X-axis linear guide; 303. 304. Large slide Z-axis slider; 305. Rotary device; 306. Angle cylinder bracket; 307. X-axis motor base; 308. X-axis lead screw; 309. X-axis servo motor; 4. Small slide assembly; 401. Small slide frame; 402. Tool holder; 403. Tool; 404. X-axis slider; 5. Hydraulic center frame; 501. Hydraulic cylinder; 502. Hydraulic gripper; 503. Rolling pulley; 6. Center frame bracket; 601. Center frame fixing part; 7. Auxiliary feeding bracket; 8. Rear electric spindle assembly; 801. Rear electric spindle box; 802. Center spindle; 803. Center drill; 804. Rear electric spindle Z-axis slider; 9. Positioning device. Detailed Implementation

[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0024] It should be noted that the descriptions of "up", "down", "left", "right", "top", "bottom", etc. in this utility model are defined based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] according to Figures 1 to 6 As shown, a long shaft center hole machining equipment includes, but is not limited to, a bed assembly 1, a front electric spindle assembly 2, a large slide assembly 3, a small slide assembly 4, a hydraulic center support 5, a center support bracket 6, an auxiliary feeding bracket 7, a rear electric spindle assembly 8, and a positioning device 9.

[0026] The bed assembly 1 includes, but is not limited to, the bed frame 101, the Z-axis servo motor 102, the Z-axis motor base 103, the Z-axis lead screw 104, the Z-axis mounting base 105, the central axis servo motor 106, the central axis motor base 107, the central axis lead screw 108, the central axis mounting base 109, and the Z-axis linear guide 110.

[0027] The large slide assembly 3 includes, but is not limited to, the large slide frame 301, the X-axis linear guide 302, the large slide Z-axis slider 303, the rotary device 304, the angle cylinder bracket 305, the X-axis motor base 306, the X-axis lead screw 307, and the X-axis servo motor 308.

[0028] The rear electric spindle assembly 8 includes, but is not limited to, the rear electric spindle box 801, the central spindle 802, the central drill 803, and the rear electric spindle Z-axis slider 804.

[0029] The upper part of the bed frame 101 has an inclined surface, and two Z-axis linear guides 110 are arranged vertically and parallel to each other on the inclined surface. A parallel and opposite Z-axis lead screw 104 and a central axis lead screw 108 are arranged between the two Z-axis linear guides 110. One end of the Z-axis lead screw 104 is connected to the Z-axis servo motor 102 through a coupling inside the Z-axis motor base 103. A Z-axis fixing seat 105 for rotating and fixing the Z-axis lead screw 104 is provided on the end of the bed frame 101 away from the Z-axis servo motor 102. One end of the central axis lead screw 108 is connected to the central axis motor base 103. The coupling inside 07 connects to the central axis servo motor 106. A central axis fixing seat 109 for rotating and fixing the central axis lead screw 108 is provided at the end of the bed frame 101 away from the central axis servo motor 106. The Z-axis servo motor 102 and the central axis fixing seat 109 are located on the left side of the bed frame 101, and the central axis servo motor 106 and the Z-axis fixing seat 105 are located on the right side of the bed frame 101. The Z-axis servo motor 102, the central axis servo motor 106, the Z-axis fixing seat 105, and the central axis fixing seat 109 are all located between two Z-axis linear guides 110. Four large slide Z-axis sliders 303 and four rear electric spindle Z-axis sliders 804 are slidably mounted on the two Z-axis linear guides 110. A large slide frame 301 is fixedly mounted on the large slide Z-axis slider 303, and an X-axis linear guide 302 is fixedly mounted on the large slide frame 301. A small slide assembly 4 is slidably mounted on the X-axis linear guide 302. The small slide assembly 4 includes a small slide frame 401, a tool holder 402, a tool 403, and an X-axis slider 404. The X-axis slider 404 is slidably connected to the X-axis linear guide 302. The small slide frame 401 is fixed on the X-axis slider 404, and there are two X-axis sliders 404. The large slide frame 301 includes a first mounting part 3011, a second mounting part 3012, and a third mounting part 3013, which are stepped and rise sequentially. An auxiliary feeding bracket 7 is fixedly connected to the first mounting part 3011. An X-axis motor base 306 is fixedly connected to the second mounting part 3012. The two ends of the coupling inside the X-axis motor base 306 are respectively connected to an X-axis lead screw 307 and an X-axis servo motor 308. An X-axis linear guide 302 is fixedly connected to the third mounting part 3013.

[0030] The small slide frame 401 is shaped like the number 7. The longer part is the slider fixing part, which is used to fix the X-axis slider 404. Perpendicular to the slider fixing part is the fixing seat mounting part, which is used to fix the X-axis fixing seat. The X-axis fixing seat is used to rotatably connect the X-axis lead screw 307. The tool holder 402 and the tool 403 are fixedly mounted on the small slide frame 401.

[0031] The center frame bracket 6 is fixedly connected to the right side of the third mounting part. The center frame bracket 6 extends upward and is higher than the small slide frame 401. The upper part of the center frame bracket 6 protrudes towards the small slide frame 401 with a center frame fixing part 601. The lower end face of the center frame fixing part 601 is provided with a gap from the upper end face of the small slide frame 401. The left side face of the center frame bracket 6 and the right side face of the small slide frame 401 are also provided with a gap.

[0032] An angle cylinder bracket 305 is fixedly installed at the upper end of the center frame fixing part 601. A rotary device 304 is fixedly connected to the angle cylinder bracket 305, and the rotary device 304 is connected to the positioning device 9. The rotary device 304 can be an angle cylinder, which can drive the positioning device 9 to rotate and extend simultaneously or separately. Angle cylinders are commercially available. The positioning device 9 includes a positioning swing arm and a positioning pin fixed to the end of the positioning swing arm. After the positioning pin rotates to a certain angle, it aligns with the axis of the center drill 803.

[0033] The hydraulic center frame 5 is fixedly connected to the left side of the center frame fixing part 601. The hydraulic center frame 5 includes a hydraulic cylinder 501 and a hydraulic gripper 502. The hydraulic gripper 502 is located below the rotary device 304, and a rolling pulley 503 is provided at the end of the hydraulic gripper 502.

[0034] The auxiliary feeding bracket 7 includes an auxiliary fixed arm and an auxiliary support frame. The auxiliary fixed arm includes a horizontal fixed plate and a bending fixed plate vertically welded to one side of the horizontal fixed plate. A bending support plate is adjustablely fixed on the bending fixed plate. The bending fixed plate and the bending support plate are set at an angle of less than 90 degrees. The horizontal fixed plate is adjustablely fixed on the first mounting part. The bending support plate is set opposite to the hydraulic gripper 502.

[0035] The left end of the bed frame 101 is fixedly connected to the front electric spindle assembly 2. The front electric spindle assembly 2 includes, but is not limited to, the front electric spindle box 201, the three-jaw chuck 202, the front motor spindle 203, the disc motor spindle, the rotary cylinder, and the water collection box. There is an installation gap between the lower end of the front electric spindle box 201 and the bed frame 101. The Z-axis servo motor 102 is located between the lower end of the front electric spindle box 201 and the bed frame 101.

[0036] The rear electric spindle assembly 8 is positioned opposite to the front electric spindle assembly 2. The rear electric spindle box 801 is fixedly connected to the Z-axis slider 804 of the rear electric spindle. The upper end of the rear electric spindle box 801 is fixedly connected to the central spindle 802. The central drill 803 is connected inside the central spindle 802.

[0037] One end of the long shaft is placed in the three-jaw chuck 202, and the other end is placed on the auxiliary feeding bracket 7. Then the rotary device 304 causes the positioning device 9 to retract toward the long shaft and rotate 90 degrees to the center of the central spindle 802. Then, one end of the long shaft is manually pressed against the positioning device 9. After positioning, the three-jaw chuck 202 clamps the long shaft first, then the hydraulic center support 5 clamps the part. The rotary device 304 causes the positioning device 9 to extend behind the long shaft and rotate back to the initial position. The front electric spindle assembly 2 enters the working state. The rotation of the three-jaw chuck 202 drives the long shaft to rotate. The X-axis servo motor 308 drives the X-axis lead screw 307 to rotate. The X-axis lead screw 307 drives the small slide assembly 4 to move. The tool 403 processes the end face of the long shaft. After processing, the small slide assembly 4 moves out. The central spindle 802 in the rear electric spindle assembly 8 rotates, driving the central drill 803 to rotate. The central spindle servo motor 106 drives the central spindle lead screw 108 to rotate, pushing the rear electric spindle assembly 8 to move towards the long shaft to process the center hole on the end face of the long shaft. After processing, the rear electric spindle assembly 8 returns to the safety point, ending the entire processing process.

[0038] The three-jaw chuck 202 of the front electric spindle assembly 2 and the central spindle 802 of the rear electric spindle assembly 8 are both integrated into the same bed assembly 1. The front electric spindle assembly 2 and the rear electric spindle assembly 8 achieve synchronous Z-axis movement via the same two Z-axis rails 110, avoiding repetitive positioning errors caused by traditional multi-device switching. The three-jaw chuck 202, auxiliary loading bracket 7, and hydraulic center support 5 form a "three-point support" for the long shaft, suppressing deflection caused by its own weight or cutting force, and ensuring the straightness of the machining axis. The Z-axis servo motor 102 drives the large slide assembly 3 to move along the Z-axis rails 110, covering the entire machining stroke of the long shaft, breaking through the stroke limitations of traditional equipment. The rear electric spindle assembly 8 is independently driven for Z-axis feed, ensuring that the center drill 803 cuts into the workpiece with constant pressure and speed, avoiding hole diameter deviations or surface roughness caused by manual operation. X-axis servo motor 308 controls the radial feed of small slide assembly 4, combined with tool 403 for finishing the long shaft end face, such as flattening the end face, providing a reference surface for subsequent center hole machining and reducing the impact of blank irregularities on concentricity. One end of the long shaft is held by a three-jaw chuck 202, and the other end is supported by auxiliary loading bracket 7. Positioning device 9 automatically retracts and rotates to the machining center line, reducing manual alignment time. After machining, rear electric spindle assembly 8 automatically returns to the safety point, realizing continuous machining process and improving efficiency. The rotation device 304 drives the positioning pin to rotate to align with the axis of center drill 803, realizing rapid alignment of the long shaft end face and eliminating the initial error caused by blank non-straightness. After positioning, hydraulic center support 5 and three-jaw chuck 202 clamp the long shaft one after the other, forming a rigid fixation and reducing vibration interference. The center spindle 802 rotates in the opposite direction to the front motor spindle 203, which can counteract the radial force during the cutting process, reduce the bending deformation of the long shaft, ensure machining stability, and improve surface finish.

[0039] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection defined by the claims of the present utility model.

Claims

1. A long axis center hole processing equipment, comprising a bed assembly (1), a front electric spindle assembly (2) is fixedly connected on the bed assembly (1), the front electric spindle assembly (2) comprises a three-jaw chuck (202), characterized in that: The bed assembly (1) includes, but is not limited to, a bed frame (101), a Z-axis servo motor (102), a Z-axis motor base (103), a Z-axis lead screw (104), a Z-axis mounting base (105), a central axis servo motor (106), a central axis motor base (107), a central axis lead screw (108), a central axis mounting base (109), and Z-axis linear guides (110). The upper part of the bed frame (101) has an inclined surface, and two Z-axis linear guides (110) are arranged parallel to each other on the inclined surface. The Z-axis servo motor (102) and the central axis servo motor (106) are located between the two Z-axis linear guides (110). The Z-axis servo motor (102) is connected to the Z-axis lead screw (104), and the central axis servo motor (106) is connected to the central axis lead screw (108). The central axis servo motor (106) is respectively set on the left and right sides of the bed frame (101). The Z-axis lead screw (104) and the central axis lead screw (108) are parallel to each other. The Z-axis lead screw (104) is helically slidably connected to the large slide assembly (3). The large slide assembly (3) is slidably connected to the small slide assembly (4). The small slide assembly (4) includes a small slide frame and a tool holder (402) fixed on the small slide frame. The large slide assembly (3) is fixedly connected to the hydraulic center frame (5) and the auxiliary feeding bracket (7). The auxiliary feeding bracket (7) and the hydraulic center frame (5) are arranged opposite to each other. The hydraulic center frame (5) and the tool holder (402) are arranged opposite to each other. The central axis lead screw (108) is helically slidably connected to the rear electric spindle assembly (8). The rear electric spindle assembly (8) includes the central spindle (802).

2. The long axis center hole machining apparatus according to claim 1, characterized by: The large pallet frame (301) includes a first mounting part (3011), a second mounting part (3012), and a third mounting part (3013) that are stepped and rise sequentially. An auxiliary feeding bracket (7) is fixedly connected to the first mounting part (3011). An X-axis servo motor (308) is fixedly connected to the second mounting part (3012). The X-axis servo motor (308) is connected to an X-axis lead screw (307). An X-axis linear guide (302) is fixedly connected to the third mounting part (3013). The X-axis lead screw (307) and the X-axis linear guide (302) are connected to the small pallet assembly (4). A center frame bracket (6) is fixedly connected to the right side of the third mounting part (3013). The center frame bracket (6) extends upward and is higher than the small pallet frame (401). A center frame fixing part (601) protrudes from the upper part of the center frame bracket (6) toward the small pallet frame (401). The center frame fixing part (601) is fixedly connected to a hydraulic center frame (5).

3. A long axis center hole machining apparatus according to claim 2, characterized by: An angle cylinder bracket (305) is fixedly installed at the upper end of the central frame fixing part (601), and a rotary device (304) is fixedly connected to the angle cylinder bracket (305). The rotary device (304) is connected to the positioning device (9).

4. The long axis center hole machining apparatus according to claim 3, characterized by: The rear electric spindle assembly (8) also includes an electric spindle box, a center drill (803), and a rear electric spindle Z-axis slider (804). The rear electric spindle Z-axis slider (804) is slidably connected to the Z-axis rail (110). The rear electric spindle box (801) is fixedly connected to the rear electric spindle Z-axis slider (804). The center spindle (802) is fixedly connected to the upper end of the rear electric spindle box (801). The center drill (803) is connected inside the center spindle (802).

5. The long shaft center hole machining equipment according to claim 4, characterized in that: The positioning device (9) includes a positioning arm and a positioning pin fixed to the end of the positioning arm. The positioning pin rotates and is aligned with or away from the axis of the center drill (803).

6. A long axis center hole machining apparatus according to claim 5, characterized by: The left side of the center frame fixing part (601) is fixedly connected to the hydraulic center frame (5), which includes a hydraulic cylinder (501) and a hydraulic gripper (502). The hydraulic gripper (502) is located below the rotary device (304).

7. A long axis center hole machining apparatus according to claim 6, characterized by: The small slide frame (401) is 7-shaped. The longer part is the slider fixing part, and the fixed seat mounting part is perpendicular to the slider fixing part. The lower end face of the slider fixing part is fixedly connected to the X-axis slider (404). The X-axis slider (404) is slidably connected to the X-axis axis rail (302). The lower end face of the fixed seat mounting part is fixedly connected to the X-axis fixed seat. The X-axis fixed seat is screwed to the X-axis lead screw (307). The upper end face of the fixed seat mounting part is fixedly connected to the tool holder (402) on the side away from the hydraulic center frame (5). The tool holder (403) is fixedly connected to the tool holder (402).

8. The long axis center hole processing apparatus according to any one of claims 1 to 7, characterized by: The front electric spindle assembly (2) includes, but is not limited to, the front electric spindle box (201), the three-jaw chuck (202), and the front motor spindle (203). There is an installation gap between the lower end of the front electric spindle box (201) and the bed frame (101). The Z-axis servo motor (102) is located between the lower end of the front electric spindle box (201) and the bed frame (101).

9. A long axis center hole machining apparatus according to claim 8, characterized by: The central spindle (802) rotates in the opposite direction to the front motor spindle (203).

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