A kind of milling device for battery tray lifting lug processing

Abstract

The application discloses a kind of milling devices for battery tray lifting lug processing, it is related to battery tray milling processing technical field, including bed body, portal frame and double Z processing power head, double Z processing power head includes supporting lifting frame and milling lifting seat, the rotary supporting assembly of supporting lifting frame lower part is driven by C-shaped supporting arm and bullet type air blowing head and centering force wedge are turned into below lifting lug, centering force wedge is inserted into center hole from below and outside inclined surface is abutted with hole wall, the face milling cutter below milling lifting seat is coaxial with center hole and its cutting edge sweep area covers installation reference surface, bullet type air blowing head blows gas from between the upper surface of lifting lug and face milling cutter to periphery, the present application can form centering support to the center hole of lifting lug when face milling cutter independent feed, and make cutting reaction force be transmitted to the load-bearing structure of portal machining center via C-shaped supporting arm, it is favorable to reduce local deviation when lifting lug is processed and clear away chip.

Description

Technical Field

[0001] This invention relates to the field of battery tray milling technology, and in particular to a milling device for machining battery tray lifting lugs. Background Technology

[0002] Battery trays typically have multiple lifting lugs around the perimeter of the tray body or side beam. These lugs are used to form the connection points between the battery tray and the vehicle body. After the lifting lugs are assembled and fixed with the empty battery tray, the mounting reference surface around the center hole needs to be machined based on a unified reference established on the tray body to control the height, angle, and coplanar relationship of the multiple lifting lug mounting reference surfaces.

[0003] Existing gantry machining centers can achieve battery tray positioning and three-axis milling through the bed, gantry frame and milling power head. However, when face milling the lifting lugs that have been assembled around the battery tray, the conventional positioning and clamping structure mainly acts on the tray body. There is a certain overhang distance between the area to be machined of the lifting lugs and the tray body. The cutting load applied by the face milling cutter can easily cause local vibration or displacement of the lifting lugs, thereby affecting the machining consistency of the mounting reference surface.

[0004] If a fixed support is installed below the lifting lug, the fixed support will easily occupy the space required for pallet loading and unloading, power head repositioning, and face milling cutter feeding. If a movable support independent of the milling power head is used, the positioning of the support structure and the face milling cutter relative to the center hole of the lifting lug needs to be completed separately. It is difficult to maintain the coaxial relationship and action connection between the support and the tool. At the same time, the chips generated by milling may also remain between the face milling cutter and the mounting reference surface and affect subsequent cutting.

[0005] Therefore, it is necessary to invent a milling device for processing battery tray lifting lugs to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a milling apparatus for processing battery tray lifting lugs, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a milling device for machining battery tray lifting lugs, comprising a bed and a gantry frame mounted on the bed, a power head mounting frame located above the machining area of ​​the bed on the gantry frame, a double Z-machining power head mounted on the side of the power head mounting frame facing the machining area, the double Z-machining power head including a support lifting frame slidably mounted on the power head mounting frame along the Z-direction and a milling lifting seat slidably mounted on the support lifting frame along the Z-direction, a face milling cutter disposed below the milling lifting seat, and a slewing bearing assembly disposed at the lower part of the support lifting frame, the slewing bearing assembly including a rotatably mounted support lifting frame. The lower part of the lifting frame has a rotary seat and a C-shaped support arm fixed at one end to the lower part of the rotary seat. The other end of the C-shaped support arm is bent downwards towards the face milling cutter and is equipped with a bullet-type air blower. A centering wedge is provided on the outside of the bullet-type air blower. When the C-shaped support arm is in the support position, the upper end of the bullet-type air blower and the centering wedge extend into the center hole of the lifting lug. The outer inclined surface of the centering wedge abuts against the hole wall of the center hole. The bullet-type air blower, the center hole and the face milling cutter are coaxial. The bullet-type air blower and the centering wedge are located in the middle clearance area of ​​the face milling cutter. The cutting edge sweeping area of ​​the face milling cutter covers the mounting reference surface around the center hole.

[0008] Preferably, the power head mounting bracket has a support plate extending in the Z direction on the side facing the support lifting frame. A support lifting screw sleeve is fixedly installed on the support plate. A support lifting drive component is fixedly installed on the upper part of the support lifting frame. A screw extending in the Z direction is provided at the output end of the support lifting drive component. The screw is threadedly engaged with the support lifting screw sleeve.

[0009] Preferably, a milling lifting drive is fixedly installed on the upper part of the support lifting frame, and a milling lifting screw extending along the Z direction is rotatably installed on the support lifting frame. The output end of the milling lifting drive is connected to the upper end of the milling lifting screw. A milling lifting screw sleeve is fixedly installed on the upper part of the milling lifting seat. The milling lifting screw sleeve is sleeved on the outside of the milling lifting screw and threadedly engaged with it.

[0010] Preferably, a mounting plate is fixedly installed at the lower part of the support lifting frame, a rotary seat is rotatably installed at the lower part of the mounting plate, a rotary drive component located on one side of the rotary seat is fixedly installed at the upper part of the mounting plate, a rotary transmission belt is installed below the mounting plate, and the rotary transmission belt is in transmission cooperation with the output end of the rotary drive component and the rotary seat respectively. The rotary drive component is a servo drive component with braking and holding function.

[0011] Preferably, the upper part of the bullet-shaped air head gradually tapers along the Z direction, and the centering and bearing wedge is set on the outer periphery of the upper part of the bullet-shaped air head. The outer inclined surface of the centering and bearing wedge gradually moves away from the axis of the bullet-shaped air head in the direction from top to bottom. When the bullet-shaped air head is inserted into the central hole, the outer inclined surface abuts against the hole wall of the central hole.

[0012] Preferably, the bullet-shaped air blower has an internal air supply channel extending along the Z direction. An air supply pipe is arranged along the extension direction on the outer side of the C-shaped support arm. The end of the air supply pipe near the bullet-shaped air blower is connected to the lower end of the air supply channel. An air blowing hole is opened at the upper part of the bullet-shaped air blower. The air blowing hole is connected to the upper end of the air supply channel. The axis of the air blowing hole is upward and inclined in a direction away from the axis of the bullet-shaped air blower. The air outlet end of the air blowing hole is located between the upper surface of the lifting lug and the face milling cutter at the support position.

[0013] Preferably, a milling drive is fixedly installed on the upper part of the milling lifting seat. The output end of the milling drive extends downward and is connected to the face milling cutter. A clearance area extending along the Z direction is formed in the middle of the face milling cutter. The cutting edge of the face milling cutter is arranged around the clearance area. The rotary sweeping area of ​​the cutting edge covers the area from the outer edge of the central hole to the outer edge of the mounting reference surface along the radial direction of the face milling cutter. The upper end of the bullet-type air blower and the centering load-bearing wedge are located in the clearance area.

[0014] Preferably, the rotation axis of the rotary seat is spaced apart from the axis of the face milling cutter, the upper end of the C-shaped support arm is located below the rotary seat, and the lower end of the C-shaped support arm is bent radially to the lower end of the face milling cutter. The rotary seat drives the bullet-type air blower and the centering load-bearing wedge to rotate between the support position coaxial with the center hole and the avoidance position that deviates from the axial projection of the face milling cutter.

[0015] Preferably, the support lifting frame has a lowering clearance position where the bullet-shaped air blower and the centering load-bearing wedge are located below the lifting lug, and an upward support position where the centering load-bearing wedge abuts against the wall of the central hole. The milling lifting seat has an upward retraction position where the face milling cutter is located above the lifting lug, and a lowering machining position where the face milling cutter contacts the mounting reference surface.

[0016] Preferably, the Z-axis sliding direction of the support lifting frame and the Z-axis sliding direction of the milling lifting seat are both parallel to the axis of the face milling cutter. The rotation plane of the C-shaped support arm between the support position and the avoidance position is perpendicular to the axis of the face milling cutter. The axis of the bullet-type air blower coincides with the axis of the face milling cutter at the support position and deviates from the axial projection of the face milling cutter at the avoidance position.

[0017] The technical effects and advantages of this invention are as follows: 1. This invention sets up a support lifting frame and a milling lifting seat on the dual Z-machining power head, and the slewing bearing assembly carries the C-shaped support arm, bullet-type air blower and centering load-bearing wedge block to the underside of the lifting lug. The centering load-bearing wedge block can extend into the center hole from below and establish a center positioning relationship and a local support relationship simultaneously with the outer inclined surface. Then, the milling lifting seat drives the face milling cutter to cut along the Z direction while keeping the X / Y coordinates unchanged. The cutting reaction force is transmitted from the lifting lug through the centering load-bearing wedge block and C-shaped support arm to the load-bearing structure of the gantry machining center. This shortens the local force transmission path of the area to be machined in the lifting lug, which helps to reduce the vibration and positional displacement of the lifting lug during face milling and improves the machining consistency of the mounting reference surface.

[0018] 2. This invention forms a first Z-axis transmission through a support lifting drive and a fixed support lifting screw sleeve, and a second Z-axis transmission through a milling lifting drive, a milling lifting screw, and a milling lifting screw sleeve. This allows the approach and exit actions of the support structure and the entry and exit actions of the face milling cutter to be performed separately. In conjunction with a rotary drive, a rotary transmission belt, and an offset rotary seat, the C-shaped support arm can rotate between the support position and the avoidance position that is offset from the axial projection of the face milling cutter. During milling, the rotary drive maintains the support position, thus taking into account both the center hole support in the machining state and the space avoidance in the repositioning state, reducing the possibility of structural interference during pallet loading and unloading, power head displacement, and face milling cutter feeding.

[0019] 3. This invention provides an air supply pipe along the C-shaped support arm and forms an air supply channel inside the bullet-shaped air blower, allowing compressed gas to be discharged from the upper surface of the lifting lug and the face milling cutter through the air blower. Since the air blower faces upward and is inclined away from the axis of the bullet-shaped air blower, the airflow flows from the central hole area to the periphery of the mounting reference surface during milling, thereby guiding the chips generated by the face milling cutter to outside the cutting edge sweeping area. This helps to reduce chip retention, repeated cutting, and surface scratches on the mounting reference surface and maintain the cleanliness of the face milling area. Attached Figure Description

[0020] Figure 1 This is an isometric schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic front view of the overall structure of the present invention.

[0022] Figure 3 This is a first-view structural schematic diagram of the dual-Z machining power head of the present invention.

[0023] Figure 4 This is a schematic diagram of the second perspective structure of the dual-Z machining power head of the present invention.

[0024] Figure 5This is a schematic diagram of the assembly structure of the milling lifting seat, milling drive component and face milling cutter of the present invention.

[0025] Figure 6 This is a schematic diagram of the slewing bearing assembly structure of the present invention.

[0026] Figure 7 This is a side view schematic diagram of the face milling cutter, lifting lug, and bullet-type air blower of the present invention in a machining engagement state.

[0027] Figure 8 This is a schematic diagram of the C-shaped support arm, bullet-type air inflator, and air supply structure of the present invention.

[0028] In the diagram: 1. Machine bed; 2. Gantry frame; 3. Double Z machining power head; 4. Slewing bearing assembly; 21. Power head mounting bracket; 31. Support lifting frame; 32. Support lifting screw sleeve; 33. Milling lifting seat; 34. Face milling cutter; 41. C-shaped support arm; 42. Slewing seat; 43. Mounting plate; 44. Slewing drive belt; 45. Bullet-type air blower; 321. Support lifting drive component; 331. Milling lifting screw; 332. Milling lifting drive component; 333. Milling lifting screw sleeve; 341. Milling drive component; 441. Slewing drive component; 451. Air blow hole; 452. Air supply pipe; 453. Centering load-bearing wedge block. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1 to 8 As shown, the milling device for machining battery tray lifting lugs provided by the present invention essentially forms independent support Z-axis motion and milling Z-axis motion on the power head of the gantry machining center, and rotates the center hole support structure that moves with the power head into the lower part of the lifting lug before machining, so as to cooperate with the face milling cutter 34 to complete the coaxial covering milling of the mounting reference surface.

[0031] In terms of specific structural installation, the structural body can be constructed according to the inventive concept of this embodiment. This embodiment does not impose special limitations on conventional installation methods that do not affect the fit relationship of the core structure.

[0032] In this embodiment, the processing object is a semi-finished tray with the lifting lugs fixed to the periphery of the empty battery tray. The battery tray is positioned in the processing area of ​​the bed 1 by a conventional positioning and clamping structure, and a unified processing reference is established with the tray body. The lifting lugs have a central hole and an installation reference surface set around the central hole. In this embodiment, the Z direction is defined as the axial direction of the face milling cutter 34 as shown in the attached figure, and the installation reference surface is set facing upward.

[0033] The bed 1 forms the base for the entire machine and provides the processing area for the battery tray. The gantry 2 is set on the bed 1, and the power head mounting bracket 21 is set on the gantry 2 and located above the processing area. The gantry 2 can drive the power head mounting bracket 21 to move in the corresponding direction according to the conventional feed method of the gantry machining center, so that the dual Z machining power head 3 can reach the X / Y coordinate position corresponding to different lifting lugs.

[0034] The dual Z-processing power head 3 is located on the side of the power head mounting frame 21 facing the processing area. The power head mounting frame 21 has a support plate extending along the Z direction. The support lifting frame 31 is slidably engaged with the support plate. The support lifting screw sleeve 32 is fixedly mounted on the support plate. The support lifting drive 321 is fixedly mounted on the upper part of the support lifting frame 31. The screw at the output end of the support lifting drive 321 extends along the Z direction and is threadedly engaged with the support lifting screw sleeve 32. When the support lifting drive 321 drives the support lifting screw sleeve 32, which is relatively fixed, to rotate, the support lifting frame 31 rises and falls along the Z direction under the sliding guidance of the support plate, thereby driving the slewing bearing assembly 4 below it to approach or move away from the lifting lug.

[0035] The milling lifting seat 33 is slidably mounted on the support lifting frame 31 along the Z-direction. The milling lifting drive component 332 is fixedly mounted on the upper part of the support lifting frame 31. The milling lifting screw 331 is rotatably mounted on the support lifting frame 31 along the Z-direction and is connected to the output end of the milling lifting drive component 332. The milling lifting screw sleeve 333 is fixedly mounted on the upper part of the milling lifting seat 33 and sleeved on the outside of the milling lifting screw 331. When the milling lifting screw 331 rotates, the threaded engagement between it and the milling lifting screw sleeve 333 drives the milling lifting seat 33 to rise and fall independently relative to the support lifting frame 31, so that the feed and retraction of the face milling cutter 34 do not need to drive the slewing bearing assembly 4 to move synchronously.

[0036] The milling drive 341 is fixedly mounted on the upper part of the milling lift 33. The output end of the milling drive 341 extends downward and directly drives the face mill 34 to rotate. The middle part of the face mill 34 forms a clearance area extending along the Z direction. The cutting edge of the face mill 34 is set around the clearance area. The sweeping area formed by the rotation of the cutting edge covers the area from the outer edge of the center hole of the lifting lug to the outer edge of the mounting reference surface in the radial direction. This allows the double Z machining power head 3 to reach the target lifting lug and complete the milling of the mounting reference surface by descending in the Z direction of the milling lift 33 while keeping the X / Y coordinates unchanged.

[0037] Mounting plate 43 is fixedly mounted on the lower part of support lifting frame 31. Rotary seat 42 is rotatably mounted on the lower part of mounting plate 43. Rotary drive component 441 is fixedly mounted on the upper part of mounting plate 43 and located on one side of rotary seat 42. Rotary transmission belt 44 is located below mounting plate 43 and is in transmission cooperation with the output end of rotary drive component 441 and rotary seat 42 respectively. Rotary drive component 441 adopts a servo drive component with braking and holding function, so that rotary seat 42 can maintain its rotation position after reaching the support position.

[0038] One end of the C-shaped support arm 41 is fixed to the lower part of the rotary seat 42, and the other end of the C-shaped support arm 41 is bent downwards towards the face cutter 34 to form a free end. The rotation axis of the rotary seat 42 is spaced apart from the axis of the face cutter 34. When the rotary drive 441 drives the rotary seat 42 to rotate through the rotary transmission belt 44, the C-shaped support arm 41 drives its free end to rotate between the support position corresponding to the center hole of the lifting lug and the avoidance position that deviates from the axial projection of the face cutter 34. Since the rotation plane of the C-shaped support arm 41 is perpendicular to the axis of the face cutter 34, the C-shaped support arm 41 can rotate into or out from under the face cutter 34 when the support lifting frame 31 is in the lowering avoidance position.

[0039] The bullet-shaped air head 45 is located on the side of the free end of the C-shaped support arm 41 facing the face mill 34. The upper part of the bullet-shaped air head 45 gradually tapers along the Z direction. The centering and bearing wedge 453 is located on the outer periphery of the upper part of the bullet-shaped air head 45. The outer inclined surface of the centering and bearing wedge 453 gradually moves away from the axis of the bullet-shaped air head 45 in the direction from top to bottom. When the support lifting frame 31 moves from the lowering clearance position to the rising support position, the upper end of the bullet-shaped air head 45 and the centering and bearing wedge 453 extend into the central hole from below the lifting lug. The outer inclined surface of the centering and bearing wedge 453 directly abuts against the hole wall of the central hole and guides the bullet-shaped air head 45 to be centered with the central hole during the continued upward movement.

[0040] When the centering wedge 453 abuts against the wall of the center hole, the bullet-shaped air blower 45, the center hole, and the face milling cutter 34 are in a coaxial state. The upper end of the bullet-shaped air blower 45 and the centering wedge 453 are located in the middle clearance area of ​​the face milling cutter 34. The cutting edge of the face milling cutter 34 is located on the outer periphery of the centering wedge 453 and corresponds to the mounting reference surface, so that the support structure and the cutting edge sweeping area are radially offset, maintaining the support state of the center hole while reserving space for the rotation and Z-axis feed of the face milling cutter 34.

[0041] The bullet-shaped air blower 45 has an air supply channel extending along the Z direction inside. The air supply pipe 452 is set along the extension direction of the C-shaped support arm 41. One end of the air supply pipe 452 near the bullet-shaped air blower 45 is connected to the lower end of the air supply channel. The other end of the air supply pipe 452 is used to connect to an external compressed air source. The air blowing hole 451 is opened on the upper part of the bullet-shaped air blower 45 and is connected to the upper end of the air supply channel. The axis of the air blowing hole 451 is upward and inclined in a direction away from the axis of the bullet-shaped air blower 45. When the bullet-shaped air blower 45 is in the support position, the air outlet end of the air blowing hole 451 is located between the upper surface of the lifting lug and the face milling cutter 34, so that the gas is discharged from the central hole area to the periphery of the mounting reference surface.

[0042] The support lifting frame 31 has a lowering avoidance position and an upper supporting position, and the milling lifting seat 33 has an upper retraction position and a lower machining position. The Z-axis sliding direction of the support lifting frame 31 and the milling lifting seat 33 is parallel to the axis of the face mill 34. In the lowering avoidance position, the bullet-type air blower 45 and the centering load-bearing wedge 453 are located below the lifting lug and separated from the center hole. In the upper supporting position, the centering load-bearing wedge 453 abuts against the wall of the center hole. In the upper retraction position, the face mill 34 is located above the mounting reference surface. In the lower machining position, the cutting edge of the face mill 34 contacts the mounting reference surface.

[0043] When this device is working, the empty battery tray with lifting lugs is first positioned and clamped in the machining area of ​​the bed 1, so that the support lifting frame 31 is in the lowering avoidance position, the milling lifting seat 33 is in the rising and retracting position, and the C-shaped support arm 41 is in the avoidance position. Then, the gantry 2 and the power head mounting frame 21 move the double Z machining power head 3 to the predetermined X / Y coordinate of the target lifting lug, so that the axis of the face milling cutter 34 corresponds to the axis of the center hole of the lifting lug.

[0044] After the double Z-processing power head 3 reaches the target lifting lug, the rotary drive 441 drives the rotary seat 42 to rotate via the rotary transmission belt 44, causing the C-shaped support arm 41 to drive the bullet-shaped air blower 45 and the centering load-bearing wedge 453 to rotate into the support position below the lifting lug. Subsequently, the support lifting drive 321 drives the support lifting frame 31 to rise, so that the bullet-shaped air blower 45 and the centering load-bearing wedge 453 extend into the center hole from below and abut against the hole wall by the outer inclined surface of the centering load-bearing wedge 453. The rotary drive 441 stops rotating and maintains the position of the rotary seat 42, thereby establishing the centering and support relationship at the position of the center hole of the lifting lug.

[0045] After the support is completed, the milling drive 341 drives the face milling cutter 34 to rotate. External compressed gas is discharged to the mounting reference surface through the air supply pipe 452, the air supply channel of the bullet-type air blower 45 and the air blow hole 451 in sequence. The milling lifting drive 332 drives the milling lifting screw 331 to rotate and drives the milling lifting seat 33 to descend along the Z direction. The face milling cutter 34 mills the mounting reference surface around the center hole while the double Z machining power head 3 keeps the X / Y coordinates unchanged. The chips leave the cutting area between the face milling cutter 34 and the upper surface of the lifting lug due to the airflow flowing from the center to the outside.

[0046] During milling, the cutting reaction force generated is transmitted sequentially through the lifting lug, centering wedge 453, the bearing part of the bullet-type air blower 45, the C-shaped support arm 41, the rotary seat 42, the mounting plate 43, the support lifting frame 31, and the power head mounting frame 21 to the gantry 2 and the bed 1. The centering wedge 453 directly contacts the wall of the center hole, so that the center positioning and local bearing are established by the same contact area. The rotational torque formed by the cutting reaction force on the rotary seat 42 is transmitted through the rotary transmission belt 44 to the rotary drive component 441 that maintains the output position.

[0047] After the target lifting lug is machined, the milling lifting drive 332 first drives the milling lifting seat 33 to rise to the rising and retracting position, so that the face milling cutter 34 leaves the mounting reference surface. The support lifting drive 321 then drives the support lifting frame 31 to descend to the descending and avoiding position, so that the centering load-bearing wedge 453 and the bullet-type air blower 45 exit the center hole. Then, the rotary drive 441 drives the C-shaped support arm 41 to rotate to avoid the avoidance position. The double Z machining power head 3 can then move to the position corresponding to the next lifting lug under the drive of the gantry 2.

[0048] In summary, this invention separates the support motion of the slewing bearing assembly 4 from the milling feed of the face milling cutter 34 through the dual Z-machining power head 3, and allows the centering wedge block 453 to enter the center hole from below the lifting lug through the C-shaped support arm 41. This forms a clear center positioning relationship and cutting reaction force transmission path during the overlay face milling process with fixed X / Y coordinates. At the same time, the bullet-type air blower 45 guides the airflow from the upper surface of the lifting lug and the face milling cutter 34 to the outside to cooperate in completing the support milling and chip removal of the mounting reference surface.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A milling device for processing battery tray lifting lugs, comprising a bed (1) and a gantry (2) mounted on the bed (1), characterized in that: The gantry (2) is provided with a power head mounting bracket (21) located above the processing area of ​​the bed (1), and a double Z processing power head (3) is provided on the side of the power head mounting bracket (21) facing the processing area. The dual Z-machining power head (3) includes a support lifting frame (31) slidably disposed on the power head mounting frame (21) along the Z direction and a milling lifting seat (33) slidably disposed on the support lifting frame (31) along the Z direction. A face milling cutter (34) is disposed below the milling lifting seat (33). The lower part of the support lifting frame (31) is provided with a slewing bearing assembly (4). The slewing bearing assembly (4) includes a slewing seat (42) rotatably disposed on the lower part of the support lifting frame (31) and a C-shaped support arm (41) with one end fixed to the lower part of the slewing seat (42). The other end of the C-shaped support arm (41) is bent downward toward the face milling cutter (34) and provided with a bullet-type air blower (45). A centering and bearing wedge (453) is provided on the outer side of the bullet-type air blower (45). When the C-shaped support arm (41) is in the support position, the upper end of the bullet-shaped air blower (45) and the centering load-bearing wedge (453) extend into the center hole of the lifting lug. The outer inclined surface of the centering load-bearing wedge (453) abuts against the hole wall of the center hole. The bullet-shaped air blower (45), the center hole and the face milling cutter (34) are coaxial. The bullet-shaped air blower (45) and the centering load-bearing wedge (453) are located in the middle clearance area of ​​the face milling cutter (34). The cutting edge sweeping area of ​​the face milling cutter (34) covers the mounting reference surface around the center hole.

2. The milling device for processing battery tray lifting lugs according to claim 1, characterized in that: The power head mounting bracket (21) has a support plate extending in the Z direction on the side facing the support lifting frame (31). A support lifting screw sleeve (32) is fixedly installed on the support plate. A support lifting drive component (321) is fixedly installed on the upper part of the support lifting frame (31). A screw extending in the Z direction is provided at the output end of the support lifting drive component (321). The screw is threadedly engaged with the support lifting screw sleeve (32).

3. The milling device for processing battery tray lifting lugs according to claim 2, characterized in that: A milling lifting drive (332) is fixedly installed on the upper part of the support lifting frame (31). A milling lifting screw (331) extending along the Z direction is rotatably installed on the support lifting frame (31). The output end of the milling lifting drive (332) is connected to the upper end of the milling lifting screw (331). A milling lifting screw sleeve (333) is fixedly installed on the upper part of the milling lifting seat (33). The milling lifting screw sleeve (333) is sleeved on the outside of the milling lifting screw (331) and threadedly engaged with it.

4. The milling device for processing battery tray lifting lugs according to claim 1, characterized in that: The lower part of the support lifting frame (31) is fixedly provided with a mounting plate (43), and the rotary seat (42) is rotatably provided on the lower part of the mounting plate (43); the upper part of the mounting plate (43) is fixedly provided with a rotary drive component (441) located on one side of the rotary seat (42), and a rotary transmission belt (44) is provided below the mounting plate (43). The rotary transmission belt (44) is in transmission cooperation with the output end of the rotary drive component (441) and the rotary seat (42) respectively. The rotary drive component (441) is a servo drive component with braking and holding function.

5. The milling device for processing battery tray lifting lugs according to claim 4, characterized in that: The upper part of the bullet-shaped air nozzle (45) gradually tapers along the Z direction. The centering and bearing wedge (453) is located on the outer periphery of the upper part of the bullet-shaped air nozzle (45). The outer inclined surface of the centering and bearing wedge (453) gradually moves away from the axis of the bullet-shaped air nozzle (45) from top to bottom. When the bullet-shaped air nozzle (45) is inserted into the central hole, the outer inclined surface abuts against the hole wall of the central hole.

6. The milling device for processing battery tray lifting lugs according to claim 5, characterized in that: The bullet-shaped air blower (45) has an air supply channel extending in the Z direction inside. An air supply pipe (452) is arranged on the outside of the C-shaped support arm (41) along its extension direction. The end of the air supply pipe (452) near the bullet-shaped air blower (45) is connected to the lower end of the air supply channel. An air blowing hole (451) is opened on the upper part of the bullet-shaped air blower (45). The air blowing hole (451) is connected to the upper end of the air supply channel. The axis of the air blowing hole (451) is upward and inclined in a direction away from the axis of the bullet-shaped air blower (45). The air outlet end of the air blowing hole (451) is located between the upper surface of the lifting lug and the face milling cutter (34) at the support position.

7. A milling device for processing battery tray lifting lugs according to claim 6, characterized in that: A milling drive unit (341) is fixedly installed on the upper part of the milling lifting seat (33). The output end of the milling drive unit (341) extends downward and is connected to the face mill (34) in a transmission manner. A clearance area extending along the Z direction is formed in the middle of the face mill (34). The cutting edge of the face mill (34) is arranged around the clearance area. The rotary sweeping area of ​​the cutting edge covers the area from the outer edge of the central hole to the outer edge of the mounting reference surface along the radial direction of the face mill (34). The upper end of the bullet-type air blower (45) and the centering load-bearing wedge (453) are located in the clearance area.

8. The milling device for processing battery tray lifting lugs according to claim 7, characterized in that: The rotation axis of the rotary seat (42) is spaced apart from the axis of the face milling cutter (34). The upper end of the C-shaped support arm (41) is located below the rotary seat (42), and the lower end of the C-shaped support arm (41) is bent radially to the lower end of the face milling cutter (34). The rotary seat (42) drives the bullet-shaped air blower (45) and the centering wedge (453) to rotate between the support position coaxial with the center hole and the avoidance position offset from the axial projection of the face milling cutter (34).

9. A milling device for machining battery tray lifting lugs according to claim 8, characterized in that: The support lifting frame (31) has a lowering avoidance position where the bullet-shaped air blower (45) and the centering load-bearing wedge (453) are located below the lifting lug, and an upward support position where the centering load-bearing wedge (453) abuts against the wall of the central hole; the milling lifting seat (33) has an upward retraction position where the face milling cutter (34) is located above the lifting lug, and a lowering machining position where the face milling cutter (34) contacts the mounting reference surface.

10. A milling device for machining battery tray lifting lugs according to claim 9, characterized in that: The Z-axis sliding direction of the support lifting frame (31) and the Z-axis sliding direction of the milling lifting seat (33) are both parallel to the axis of the face milling cutter (34). The rotation plane of the C-shaped support arm (41) between the support station and the avoidance station is perpendicular to the axis of the face milling cutter (34). The axis of the bullet-shaped air blower (45) coincides with the axis of the face milling cutter (34) at the support station and deviates from the axial projection of the face milling cutter (34) at the avoidance station.

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