Bar milling equipment

Abstract

The invention discloses bar milling equipment, which belongs to the field of numerical control machine tool machining and comprises a clamp stabilizing seat, an avoiding clamp is fixedly mounted at the top of the clamp stabilizing seat, a pressing plate avoiding mechanism is arranged on the avoiding clamp and used for controlling a pressing plate to avoid a milling cutter, a workpiece side wall temporary stabilizing mechanism is arranged outside the avoiding clamp, and a workpiece side wall temporary stabilizing mechanism is arranged outside the workpiece side wall temporary stabilizing mechanism. The stabilizing device is used for temporarily stabilizing the side wall of the hollow bar after avoiding of the avoiding clamp. By arranging the side wall stability compensation component and the side wall temporary stability component, corresponding stable fitting, pressure or suction compensation on the outer side of the side wall of the hollow bar shell can be generated when the avoiding clamp avoids based on the machining route of the milling tool, so that the influence of the milling tool on the avoiding area of the machine tool clamp is reduced, and the machining efficiency is improved. And the telescopic pipe is intermittently restored to the original state by clamping the stable compensation telescopic pipe, long-time pressure or suction compensation is not generated on the side wall of the workpiece, bending deformation of the side wall of the workpiece is avoided, and then the effect of improving the machining precision of the workpiece is achieved.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tool processing technology, and in particular to a bar milling processing equipment. Background Technology

[0002] CNC machine tools compile data such as the process route, process parameters, tool movement trajectory, displacement, and cutting parameters of the workpiece into a machining program, which is then input into the machine tool control unit to drive the machining unit and achieve automated machining of the workpiece. In this process, the CNC fixture plays a crucial role in fixing the workpiece and ensuring it is in the correct machining position.

[0003] For milling finishes (e.g., deburring or edge grinding) of the outer edge of axisymmetric workpieces (such as hollow bars), a clamping plate is typically placed on top of the machine tool fixture to stably hold the workpiece and prevent indentations or bending deformations that might occur on the workpiece wall due to lateral clamping, thus affecting machining accuracy. However, during CNC milling, the tool needs to travel along a continuous path along the workpiece's outer contour, and the clamping plate can interfere with the tool trajectory. In existing technologies, the clamping plate is often specially designed to have an automatic avoidance function to prevent collisions with the milling tool. Nevertheless, current clamping solutions with obstacle avoidance capabilities still have the following drawbacks: 1. When the clamping plate performs an avoidance action, it will inevitably release the clamping constraint on the workpiece, resulting in the loss of clamping force in that local area and a decrease in workpiece stability. Under the action of milling force, this can easily cause workpiece vibration, which in turn seriously affects machining accuracy. 2. For thin-walled workpieces such as hollow bars, the sidewall rigidity is relatively weak. Conventional fixtures rely on a specific structure at the bottom of the pressure plate to limit the top of the workpiece's sidewall, resisting the radial pressure exerted on the sidewall by the cutting tool during milling and preventing inward bending deformation. Once the pressure plate detaches from the workpiece to avoid the cutting tool, this limiting effect disappears. Under the action of milling force, the workpiece sidewall is prone to elastic deformation, causing the actual machining path to deviate from the programmed trajectory, resulting in under-milling or over-milling, ultimately making the machining quality of that area fail to meet design requirements.

[0004] Therefore, a bar milling machine is proposed. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art by proposing a bar milling processing equipment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A bar milling machine includes a milling machine tool for milling hollow bars. The milling machine tool is equipped with a milling operating table, and the milling operating table is connected to a milling cutter via a milling motor. The milling machine tool is provided with a movable seat, and a clamping stabilizing seat is fixedly installed on the top of the movable seat. An avoidance clamp is fixedly installed on the top of the clamping stabilizing seat by fixing screws. The avoidance clamp is provided with a pressure plate avoidance mechanism, which is used to control the pressure plate to avoid the milling cutter. The workpiece sidewall stabilization mechanism is provided outside the avoidance fixture. The workpiece sidewall stabilization mechanism is used to temporarily stabilize the sidewall of the hollow bar after the avoidance fixture has avoided it.

[0007] Preferably, the pressure plate avoidance mechanism consists of a milling tool monitoring component and an avoidance drive component. The milling tool monitoring component includes a photoelectric switch disposed on the top of the avoidance fixture. The photoelectric switch consists of an infrared reflection sensor and a trigger switch.

[0008] Preferably, the avoidance drive component includes a stepper motor disposed on the top of the avoidance fixture, the stepper motor is fixed with a gear set through an output shaft, the stepper motor is connected to a fixture pressure plate through the gear set, the side wall of the fixture pressure plate is provided with a double-headed clamping arm, and an avoidance cylinder is disposed inside the avoidance fixture.

[0009] Preferably, the inner wall of the double-headed clamping arm is slidably connected with a controllable clamping claw, and the controllable clamping claw is controlled to rise and fall by an avoidance cylinder.

[0010] Preferably, the avoidance cylinder is connected to a pneumatic control pipe, and a pneumatic control valve is installed inside the pneumatic control pipe.

[0011] Preferably, the workpiece sidewall temporary stabilization mechanism consists of a sidewall stabilization compensation component and a sidewall temporary stabilization component. The sidewall stabilization compensation component includes a clamp stabilization compensation telescopic tube disposed on the side of the avoidance clamp near the hollow bar. A stabilizing sleeve fixed to the sidewall of the avoidance clamp is slidably connected to the outer surface of the clamp stabilization compensation telescopic tube, and a compensation suction cup is disposed on the side of the clamp stabilization compensation telescopic tube near the hollow bar.

[0012] Preferably, the bottom of the clamping plate is fixed with an intermittent stabilizing gear, the intermittent stabilizing gear meshes with a transmission gear, the transmission gear is connected to a control shaft via a drive gear, the control shaft controls the clamping stabilizing compensation telescopic tube to extend and retract via a meshing rack, and a sealing gasket is adhered to the side of the compensation suction cup near the hollow rod.

[0013] Preferably, the sidewall stabilizing component includes a pneumatically controlled locking sleeve connected to the pneumatic control tube, wherein the pneumatically controlled locking sleeve controls the clamp to stabilize and compensate for the extension and retraction of the telescopic tube via a support bracket.

[0014] Preferably, the support bracket is engaged with the top of the clamp stabilizing compensation telescopic tube via a support connecting rod, and the support connecting rod and the clamp stabilizing compensation telescopic tube are staggered.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the synergistic effect of the sidewall stabilization compensation component and the sidewall temporary stabilization component, the corresponding stabilizing fit, pressure or suction compensation can be applied to the outer sidewall of the hollow bar shell when the avoidance fixture performs the avoidance action according to the actual machining path of the milling tool. This mechanism effectively enhances the local rigidity of the workpiece sidewall in the avoidance area, suppresses the vibration and deformation caused by the temporary release of the clamping force, thereby significantly reducing the machining quality fluctuation caused by the fixture avoidance in the milling tool path, and ultimately improving the overall machining accuracy of the workpiece.

[0016] 2. Based on an obstacle avoidance fixture equipped with a stepper motor and an obstacle avoidance cylinder, and combined with the real-time detection function of a photoelectric switch, the system can drive the fixture pressure plate to rotate precisely in a preset direction before the milling cutter approaches the fixture, thereby triggering the compensation chuck to perform corresponding stabilization compensation on the workpiece sidewall. Simultaneously, during the controllable clamping jaws' downward pressing process, the system can lock the fixture's stabilization compensation telescopic tube, preventing mechanical damage to its transmission connection parts (such as the idle rotating shaft and intermittent stabilizing gear) during subsequent milling vibrations. This effectively protects the workpiece sidewall stabilization mechanism and extends its service life.

[0017] 3. Utilizing the linkage design between the clearance fixture equipped with a pneumatic control tube and the intermittent stabilizing gear, the system can automatically release the locking state of the fixture's stabilizing compensation telescopic tube while raising the controllable gripper. Through the intermittent rack structure within the intermittent stabilizing gear, the compensation telescopic tube is driven to quickly reset, avoiding unnecessary continuous pressure or suction compensation on the workpiece sidewall. This prevents potential workpiece sidewall bending or plastic deformation, further ensuring the workpiece's machining shape accuracy and dimensional consistency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a bar milling equipment proposed in this invention; Figure 2 This is a schematic diagram of the structure of a clamping stabilizer in a bar milling machine proposed in this invention; Figure 3 For the present invention Figure 2 Enlarged view of the structure at point A in the middle; Figure 4 This is a schematic diagram of the clearance fixture in a bar milling machine proposed in this invention; Figure 5 This is a schematic cross-sectional view of the internal structure of the avoidance fixture in a bar milling machine proposed in this invention; Figure 6 This is a schematic diagram of the structure of the intermittent stabilizing gear disc and the clamping stabilizing compensation telescopic tube transmission connection in a bar milling equipment proposed in this invention; Figure 7 This is an exploded view of the structure of the stepper motor, clamping plate, and controllable clamping jaws in a bar milling equipment proposed in this invention; Figure 8 This is a schematic cross-sectional view of the internal structure of the double-headed clamping arm in a bar milling machine proposed in this invention; Figure 9 This is an exploded view of the structure of the control shaft, the clamping stability compensation telescopic tube, and the support bracket in a bar milling equipment proposed in this invention.

[0019] In the diagram: 1. Fixture stabilizer; 2. Avoidance fixture; 21. Infrared reflection sensor; 22. Stepper motor; 23. Avoidance cylinder; 231. Pneumatic control tube; 232. Pneumatic control valve; 3. Fixture pressure plate; 31. Double-headed clamping arm; 32. Controllable clamping claw; 4. Fixture stabilization compensation telescopic tube; 41. Stabilizing sleeve; 42. Compensating suction cup; 5. Intermittent stabilizing gear plate; 51. Drive gear; 52. Control shaft; 53. Meshing rack; 6. Pneumatic locking sleeve; 7. Support bracket; 71. Support connecting rod; 8. Milling machine tool; 81. Milling operating table; 82. Moving module. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] Reference Figures 1-9 A bar milling processing equipment includes a milling machine tool 8 for milling hollow bars. A milling operating table 81 is installed on the milling machine tool 8. The milling operating table 81 is connected to a milling cutter via a milling motor. A movable seat 82 is provided on the milling machine tool 8. A clamping stabilizing seat 1 is fixedly installed on the top of the movable seat 82. An avoidance clamp 2 is fixedly installed on the top of the clamping stabilizing seat 1 by fixing screws. A pressure plate avoidance mechanism is provided on the avoidance clamp 2. The pressure plate avoidance mechanism is used to control the pressure plate to avoid the milling cutter. A workpiece sidewall temporary stabilization mechanism is provided outside the avoidance clamp 2. The workpiece sidewall temporary stabilization mechanism is used to temporarily stabilize the sidewall of the hollow bar after the avoidance clamp 2 avoids the cutter.

[0022] Through the above technical solution, the milling path of the milling cutter can be obtained through the compiler, i.e., the milling machining requirements. Thus, it is possible to determine the specific position of the milling cutter when it passes the avoidance fixture 2, which is located on the inner side, outer side, or directly above the outer edge of the hollow bar shell. That is, it can be determined by the perimeter of the path set by the milling cutter. For example, when the milling cutter processes along the inner side of the outer edge of the hollow bar shell, its perimeter is the shortest; when it processes along the directly above the outer edge of the shell, its perimeter is the second shortest; and when it processes along the outer side of the shell, its perimeter is the longest. This is the existing technology and will not be elaborated on further.

[0023] like Figure 4 As shown, the pressure plate avoidance mechanism consists of a milling tool monitoring component and an avoidance drive component. The milling tool monitoring component includes a photoelectric switch located on the top of the avoidance fixture 2. The photoelectric switch consists of an infrared reflection sensor 21 and a trigger switch.

[0024] Through the above technical solution, the infrared reflection sensor 21 is set at the milling cutter's travel path. Before the milling cutter travels to the avoidance fixture 2, it receives the light emitted by the milling cutter's machining seat, turns on the trigger switch, and provides the triggering conditions for the subsequent avoidance cylinder 23 and stepper motor 22.

[0025] like Figure 3 and Figure 5 As shown, the obstacle avoidance drive component includes a stepper motor 22 disposed on the top of the obstacle avoidance fixture 2. The stepper motor 22 is fixed with a gear set through the output shaft. The stepper motor 22 is connected to the fixture pressure plate 3 through the gear set. The side wall of the fixture pressure plate 3 is provided with a double-headed clamping arm 31. An obstacle avoidance cylinder 23 is disposed inside the obstacle avoidance fixture 2.

[0026] Through the above technical solution, the inner wall of the double-headed clamping arm 31 is sealed and slidably connected with a controllable clamping claw 32. The controllable clamping claw 32 is controlled to rise and fall by an avoidance cylinder 23. The avoidance cylinder 23 is connected to a pneumatic control pipe 231, and a pneumatic control valve 232 is installed inside the pneumatic control pipe 231.

[0027] Based on the above, after the double-headed clamping arm 31 rotates to the top of the outer edge of the hollow bar shell, the corresponding part of the avoidance cylinder 23 is controlled by the pneumatic control pipe 231 to press into the avoidance clamp 2, so that the controllable clamping claw 32 descends and stabilizes the top of the outer edge of the hollow bar shell. Furthermore, the rotation path of the clamping plate 3 controlled by the stepper motor 22 is divided into two types: when the milling cutter moves along the inner side or directly above the outer edge of the housing, the stepper motor 22 drives the clamping plate 3 to rotate counterclockwise; when the milling cutter moves along the outer side of the outer edge of the housing, the stepper motor 22 drives the clamping plate 3 to rotate clockwise.

[0028] like Figure 6 and Figure 9As shown, the workpiece sidewall stabilization mechanism consists of a sidewall stabilization compensation component and a sidewall temporary stabilization component. The sidewall stabilization compensation component includes a clamp stabilization compensation telescopic tube 4 disposed on the side of the avoidance clamp 2 near the hollow bar. A stabilizing sleeve 41 fixed to the sidewall of the avoidance clamp 2 is slidably connected to the outer surface of the clamp stabilization compensation telescopic tube 4, and a compensation suction cup 42 is disposed on the side of the clamp stabilization compensation telescopic tube 4 near the hollow bar.

[0029] Through the above technical solution, the bottom of the clamping plate 3 is fixed with an intermittent stabilizing gear 5, which meshes with a transmission gear. The transmission gear is connected to a control shaft 52 via a drive gear 51. The control shaft 52 controls the extension and retraction of the clamping stabilizing compensation telescopic tube 4 via a meshing rack 53. A sealing gasket is adhered to the side of the compensation suction cup 42 near the hollow bar. After it is attached to the surface of the hollow bar shell, as the clamping stabilizing compensation telescopic tube 4 extends or shortens, positive or negative air pressure is generated inside the compensation suction cup 42, providing pressure or suction compensation to the side wall of the workpiece at this location.

[0030] Based on the above, the workpiece sidewall stabilization mechanism is divided into three working states according to the milling tool's machining path: non-working and pressure or suction compensation. When the milling tool is machining along the outer edge of the hollow bar shell, the workpiece sidewall stabilization mechanism does not participate in the work. Specifically, after the pneumatic control pipe 231 presses into the avoidance fixture 2, the pneumatic control valve 232 in the pneumatic locking sleeve 6 is closed. At this time, the support connecting rod 71 always remains in contact with the fixture stabilization compensation telescopic pipe 4, fixing the position of the fixture stabilization compensation telescopic pipe 4, so as not to generate suction or pressure on the workpiece sidewall. It also stabilizes the workpiece sidewall by contacting the surface of the workpiece sidewall with the sealing gasket, avoiding the problem of the top of the workpiece sidewall being unstable after the fixture pressure plate 3 avoids the milling tool, resulting in substandard milling. Furthermore, when the milling cutter processes along the inner side of the outer edge of the hollow bar shell, it will generate an outward extrusion force on the side wall of the workpiece. At this time, the workpiece side wall stabilization mechanism provides pressure compensation for the workpiece side wall to counteract the outward extrusion force generated by the milling cutter's inner processing. Specifically, when the stepper motor 22 drives the clamping plate 3 to rotate counterclockwise, the drive gear 51 at the top of the control shaft 52 rotates counterclockwise and drives the meshing rack 53 to move closer to the workpiece side wall, so that the compensation suction cup 42 squeezes the outer side of the workpiece side wall and provides pressure compensation to the outer side of the workpiece side wall. Based on the above, when the milling cutter processes along the outer side of the hollow bar shell, it will generate an inward squeezing force on the side wall of the workpiece. At this time, the workpiece side wall stabilization mechanism will provide suction compensation for the side wall of the workpiece to counteract the inward squeezing force generated by the outer side processing of the milling cutter. Specifically, when the stepper motor 22 drives the clamping plate 3 to rotate clockwise, the control shaft 52 rotates clockwise and drives the meshing rack 53 to move away from the side wall of the workpiece, so that the compensation suction cup 42 adsorbs the outer side of the side wall of the workpiece and provides suction compensation for the outer side of the side wall of the workpiece. Thus, after avoiding the clamping 2 and avoiding the milling cutter, the stability of the workpiece is improved and the machining accuracy of the workpiece is increased.

[0031] like Figure 9 As shown, the sidewall stabilization component includes a pneumatic locking sleeve 6 connected to the pneumatic control tube 231. The pneumatic locking sleeve 6 controls the extension and retraction of the clamping compensating telescopic tube 4 via the support bracket 7.

[0032] Through the above technical solution, the support bracket 7 is engaged with the top of the clamp stabilizing compensation telescopic tube 4 via the support connecting rod 71, and the support connecting rod 71 and the clamp stabilizing compensation telescopic tube 4 are staggered.

[0033] Based on the above, the stepper motor 22 controls the single rotation angle of the clamping plate 3 to be ninety degrees. After the stepper motor 22 controls the double-headed clamping arm 31 to detach from the top of the side wall of the hollow bar, the pneumatic control tube 231 is activated to increase the air pressure inside the avoidance clamp 2. This causes the controllable clamping claw 32 to descend, while simultaneously driving the support bracket 7 to descend. The support connecting rod 71 is then attached to the top of the extended or retracted clamping stabilizing compensation telescopic tube 4 to fix the clamping stabilizing compensation telescopic tube 4. This stabilizes the compensation pressure or suction on the side wall of the workpiece after the avoidance clamp 2 has avoided the workpiece. Furthermore, after the milling cutter moves away from the avoidance fixture 2, the air pressure control pipe 231 creates negative pressure inside the avoidance fixture 2, controlling the controllable gripper 32 to rise while simultaneously driving the support bracket 7 to rise, thus releasing the stability of the fixture stabilizing compensation telescopic tube 4. This allows the toothed part of the intermittent stabilizing gear 5 to mesh with the drive gear 51, controlling the meshing rack 53 to rotate in the opposite direction, thereby resetting the fixture stabilizing compensation telescopic tube 4.

[0034] Working principle: In this invention, when a milling cutter processes the outer edge of a hollow bar shell, the avoidance fixture 2 avoids the passing milling cutter in order to cooperate with the processing path of the milling cutter. The avoidance process is divided into clamping release and pressure plate avoidance process, as well as workpiece sidewall stability compensation and temporary stabilization process, according to the working sequence of the avoidance fixture 2 participating in the mechanism. The clamping release and pressure plate avoidance process is as follows: When the milling cutter is not close to the avoidance fixture 2, the avoidance fixture 2 is in its initial state. At this time, the double-headed clamping arm 31 descends to the top of the workpiece side wall through the pneumatic control pipe 231 to stabilize the workpiece side wall. When the milling cutter approaches the avoidance fixture 2, the double-headed clamping arm 31 is retracted into the clamping pressure plate 3 through the pneumatic control pipe 231, and the stepper motor 22 is started to drive the clamping pressure plate 3 to rotate, so that it rotates ninety degrees to release the clamping state of the top of the workpiece side wall, without hindering the milling cutter from performing milling work on the top of the workpiece side wall. The workpiece sidewall stabilization compensation process is as follows: The workpiece sidewall stabilization compensation is divided into three working states according to the milling tool's machining path: no working and pressure or suction compensation. When the milling tool is machining along the outer edge of the hollow bar shell, the workpiece sidewall temporary stabilization mechanism does not participate in the work. Specifically, after the pneumatic control pipe 231 presses into the avoidance fixture 2, the pneumatic control valve 232 in the pneumatic locking sleeve 6 is closed. At this time, the support connecting rod 71 always remains in contact with the fixture stabilization compensation telescopic pipe 4, fixing the position of the fixture stabilization compensation telescopic pipe 4, so as not to generate suction or pressure on the workpiece sidewall. It also stabilizes the workpiece sidewall by contacting the surface of the workpiece sidewall through the sealing gasket, avoiding the problem of the top of the workpiece sidewall being unstable after the fixture pressure plate 3 avoids the milling tool, resulting in substandard milling. Furthermore, when the milling cutter processes along the inner side of the outer edge of the hollow bar shell, it will generate an outward extrusion force on the side wall of the workpiece. At this time, the workpiece side wall stabilization mechanism provides pressure compensation for the workpiece side wall to counteract the outward extrusion force generated by the milling cutter's inner processing. Specifically, when the stepper motor 22 drives the clamping plate 3 to rotate counterclockwise, the drive gear 51 at the top of the control shaft 52 rotates counterclockwise and drives the meshing rack 53 to move closer to the workpiece side wall, so that the compensation suction cup 42 squeezes the outer side of the workpiece side wall and provides pressure compensation to the outer side of the workpiece side wall. Based on the above, when the milling cutter processes along the outer side of the hollow bar shell, it will generate an inward squeezing force on the side wall of the workpiece. At this time, the workpiece side wall stabilization mechanism will provide suction compensation for the side wall of the workpiece to counteract the inward squeezing force generated by the outer side of the milling cutter. Specifically, when the stepper motor 22 drives the clamping plate 3 to rotate clockwise, the control shaft 52 rotates clockwise and drives the meshing rack 53 to move away from the side wall of the workpiece, so that the compensation suction cup 42 adsorbs the outer side of the side wall of the workpiece and provides suction compensation for the outer side of the side wall of the workpiece. Thus, after avoiding the clamping 2 and avoiding the milling cutter, the stability of the workpiece is improved and the machining accuracy of the workpiece is increased. The temporary stabilization process of workpiece sidewall stability compensation is as follows: the stepper motor 22 controls the single rotation angle of the clamping plate 3 to be ninety degrees. After the stepper motor 22 controls the double-headed clamping arm 31 to disengage from the top of the hollow bar sidewall, the pneumatic control tube 231 is activated to increase the air pressure inside the avoidance clamp 2. This causes the controllable clamping claw 32 to descend, while simultaneously driving the support bracket 7 to descend. The support connecting rod 71 is then attached to the top of the extended or retracted clamp stability compensation telescopic tube 4 to fix the clamp stability compensation telescopic tube 4. Thus, after the avoidance clamp 2 avoids the workpiece, the compensation pressure or suction force on the workpiece sidewall is stabilized.

[0035] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A bar milling processing equipment, comprising a milling machine tool (8) for milling hollow bars, characterized in that, The milling machine tool (8) is equipped with a milling operating table (81), and the milling operating table (81) is connected to a milling cutter via a milling motor. The milling machine tool (8) is provided with a moving seat (82), and a clamping stabilizing seat (1) is fixedly installed on the top of the moving seat (82). An avoidance clamp (2) is fixedly installed on the top of the clamping stabilizing seat (1) by a fixing screw. A pressure plate avoidance mechanism is provided on the avoidance clamp (2), and the pressure plate avoidance mechanism is used to control the pressure plate to avoid the milling cutter. The workpiece sidewall stabilization mechanism is provided outside the avoidance fixture (2). The workpiece sidewall stabilization mechanism is used to temporarily stabilize the sidewall of the hollow bar after the avoidance fixture (2) avoids it.

2. The bar milling equipment according to claim 1, characterized in that, The pressure plate avoidance mechanism consists of a milling tool monitoring component and an avoidance drive component. The milling tool monitoring component includes a photoelectric switch located on the top of the avoidance fixture (2). The photoelectric switch consists of an infrared reflection sensor (21) and a trigger switch.

3. The bar milling equipment according to claim 2, characterized in that, The avoidance drive component includes a stepper motor (22) disposed on the top of the avoidance fixture (2). The stepper motor (22) is fixed with a gear set through the output shaft. The stepper motor (22) is connected to the fixture pressure plate (3) through the gear set. The side wall of the fixture pressure plate (3) is provided with a double-headed clamping arm (31). The avoidance fixture (2) is provided with an avoidance cylinder (23).

4. The bar milling equipment according to claim 3, characterized in that, The inner wall of the double-headed clamping arm (31) is sealed and slidably connected with a controllable clamping claw (32), which is controlled to rise and fall by an avoidance cylinder (23).

5. The bar milling equipment according to claim 3, characterized in that, The avoidance cylinder (23) is connected to a pneumatic control pipe (231), and a pneumatic control valve (232) is installed inside the pneumatic control pipe (231).

6. The bar milling equipment according to claim 5, characterized in that, The workpiece sidewall stabilization mechanism consists of a sidewall stabilization compensation component and a sidewall stabilization component. The sidewall stabilization compensation component includes a clamp stabilization compensation telescopic tube (4) disposed on the side of the avoidance clamp (2) near the hollow bar. The outer surface of the clamp stabilization compensation telescopic tube (4) is slidably connected to a stabilizing sleeve (41) fixed to the sidewall of the avoidance clamp (2), and a compensation suction cup (42) is disposed on the side of the clamp stabilization compensation telescopic tube (4) near the hollow bar.

7. The bar milling equipment according to claim 6, characterized in that, The bottom of the clamping plate (3) is fixed with an intermittent stabilizing gear (5), which meshes with a transmission gear. The transmission gear is connected to a control shaft (52) via a drive gear (51). The control shaft (52) controls the clamping stabilizing compensation telescopic tube (4) to extend and retract via a meshing rack (53). A sealing gasket is adhered to the side of the compensation suction cup (42) near the hollow rod.

8. A bar milling machine according to claim 6, characterized in that, The sidewall stabilizing component includes a pneumatic locking sleeve (6) connected to the pneumatic control tube (231), and the pneumatic locking sleeve (6) controls the extension and retraction of the clamp stabilizing compensation telescopic tube (4) through the support bracket (7).

9. A bar milling machine according to claim 8, characterized in that, The support bracket (7) is connected to the top of the clamp stabilizing compensation telescopic tube (4) via a support link (71), and the support link (71) and the clamp stabilizing compensation telescopic tube (4) are staggered.

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