Anti-polarization positioning mechanism at tail end of composite turning and milling lifting tool turret

Abstract

The invention relates to an anti-polarization positioning mechanism for the tail end of a composite turning and milling lifting tool turret. The anti-polarization positioning mechanism comprises a supporting frame, a tool turret module and an anti-polarization positioning module. A protruding ring is arranged on the outer side of the supporting frame, and the annular base of the tool turret module is rotationally installed on the protruding ring. The anti-polarization positioning module is arranged between the annular base and the convex ring and comprises an end face fluted disc set, a floating sleeve and a driving control assembly. Wherein the fixed fluted disc is fixed to the end face of the convex ring, the movable fluted disc is axially and movably arranged on the annular base, and the floating sleeve abuts against the movable fluted disc and is driven by the driving control assembly to axially move, so that meshing locking or separation unlocking of the fluted discs is controlled. The positioning and locking mechanism is arranged at the tail end of the tool turret in front, so that a force arm between a cutting force acting point and a locking point is greatly shortened, the overall rigidity of the tool turret is remarkably improved, the problem of tail end polarization under the heavy cutting working condition is effectively solved, and the machining precision and the surface quality are guaranteed.

Description

Technical Field

[0001] This invention relates to the technical field of CNC machine tools, and more specifically, to a composite milling and turning turret end anti-polarization positioning mechanism. Background Technology

[0002] In the field of CNC machine tool manufacturing, composite milling and turning machining centers are widely used for one-time clamping and forming of complex parts due to their high integration and high efficiency. Among them, the turret, as a core functional component, undertakes the tasks of tool installation, tool selection, positioning, and cutting. Its positioning accuracy and vibration resistance directly determine the machining accuracy and surface quality of the entire machine.

[0003] Existing turret positioning mechanisms typically employ end gear plates, ratchet plates, or indexing plates. In traditional designs, limited by the space available for drive components (such as motors and hydraulic motors), these positioning mechanisms are mostly located at the root of the turret, i.e., at the connection between the turret housing and the saddle, or near the drive shaft.

[0004] However, in actual cutting processes, especially under heavy or intermittent cutting conditions, the turret acts like a cantilever beam. The cutting force acts on the tool tip, and the farther away from the root support point (i.e., the turret end), the longer the lever arm, resulting in greater bending and torque. Under heavy loads, the minute elastic deformation at the turret end is amplified, leading to significant polarization of the tool tip. This not only severely affects the quality of the machined surface and accelerates tool wear, but also limits the machine tool's accuracy retention under heavy cutting conditions. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a composite milling and turning lifting turret end anti-polarization positioning mechanism to address the above-mentioned defects of the prior art.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: This invention provides a composite milling and turning lifting turret end anti-polarization positioning mechanism, comprising a support frame and a turret module. The outer surface of the support frame is provided with an outwardly protruding ring. The turret module includes an annular base, the rear end of which is rotatably mounted on the protruding ring. An anti-polarization positioning module is provided between the annular base and the protruding ring. The anti-polarization positioning module includes: The end face gear disk assembly includes a fixed gear disk and a movable gear disk arranged opposite to each other, used to realize the indexing and locking of the turret; the fixed gear disk is fixed to the end face of the convex ring, and the movable gear disk is axially movably arranged on the annular base; A floating sleeve is axially reciprocatingly disposed around the convex ring, with its front end face abutting against the movable gear disc; And a drive control component, used to drive the floating sleeve to move axially forward or backward, so as to control the engagement or disengagement of the fixed gear plate and the moving gear plate.

[0007] The composite milling and turning turret end anti-polarization positioning mechanism of the present invention includes a drive control component comprising multiple inertial oscillators and a telescopic control module; the inertial oscillators are oscillatingly mounted on the support frame, and each inertial oscillator has a contact at its first end facing the floating sleeve for engaging with the cam profile surface on the outer periphery of the floating sleeve; the telescopic control module is used to control the second end of the inertial oscillator to swing forward or backward, thereby driving the floating sleeve to move axially.

[0008] The composite milling and turning lifting turret end anti-polarization positioning mechanism of the present invention, wherein the cam profile surface is a wavy profile surface, the pressure angle at the trough is less than the friction angle to form a self-locking section, and the pressure angle at the crest is greater than the friction angle to form a non-self-locking section; When the telescopic control module drives the inertial oscillator to swing and the contact enters the self-locking section, the floating sleeve is locked in an axial position that keeps the fixed toothed disc and the moving toothed disc engaged; when the contact enters the non-self-locking section under the drive of the telescopic control module, the floating sleeve is allowed to move axially to release the engagement between the fixed toothed disc and the moving toothed disc.

[0009] The composite milling and turning lifting turret end anti-polarization positioning mechanism of the present invention includes a turret module further comprising a plurality of tool holders arranged circumferentially along the outer surface of the annular base; the annular base is provided with a plurality of through holes corresponding one-to-one with the tool holders; one end of the through hole is connected to the inner cavity of the annular base, and the other end is connected to the tool mounting hole of the corresponding tool holder.

[0010] The composite milling and turning lifting turret end anti-polarization positioning mechanism of the present invention includes an inertial oscillator comprising a swing arm hinged to the support frame via a pin. The telescopic control module controls the swing arm to swing around the pin under the action of cutting vibration, thereby driving the contact to move along the cam profile surface.

[0011] The composite milling and turning lifting turret end anti-polarization positioning mechanism of the present invention includes a floating sleeve connected to the support frame via an axial guide pin. The floating sleeve is provided with a guide groove for the axial guide pin to slide. The extension direction of the guide groove is parallel to the axial direction of the turret module to restrict the rotation of the floating sleeve relative to the support frame.

[0012] The composite milling and turning lifting turret end anti-polarization positioning mechanism of the present invention includes a wear-resistant and friction-reducing layer between the inner side of the floating sleeve and the outer peripheral surface of the convex ring.

[0013] The composite milling and turning lifting turret end anti-polarization positioning mechanism of the present invention includes a labyrinth sealing structure between the outer edge of the annular base and the convex ring to prevent cutting fluid and foreign matter from entering the interior of the anti-polarization positioning mechanism.

[0014] The composite milling and turning lifting turret end anti-polarization positioning mechanism of the present invention includes a rotary drive module on the support frame for driving the turret module to rotate; the support frame is provided with a clearance opening to avoid the output shaft of the rotary drive module; the clearance opening is located within the area enclosed by the convex ring.

[0015] The composite milling and turning lifting turret end anti-polarization positioning mechanism of the present invention further includes a mounting base, on which a lifting component is provided to drive the support frame to move along the Z-axis.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention creatively positions the anti-polarization positioning module between the annular base and the convex ring, specifically near the end of the turret (the tool tip side). This arrangement significantly shortens the distance (lever arm) between the point of application of the cutting force and the positioning locking point. Based on the cantilever beam deformation principle, the shortened lever arm directly reduces the impact of bending moment and torque on turret deformation, fundamentally improving the turret's vibration resistance and rigidity, effectively suppressing end-point polarization, and ensuring machining stability under heavy cutting. Because this invention effectively suppresses polarization and vibration at the turret end, the stability during the cutting process is greatly improved. This not only significantly improves the surface finish of the workpiece (reducing chatter marks) but also effectively reduces tool chipping and abnormal wear caused by vibration, thereby extending tool life and reducing production costs.

[0017] 2. This invention uses an end-face gear disk assembly (fixed gear disk and moving gear disk) as the positioning and locking element. The end-face gear disk structure has an automatic centering function, which can eliminate backlash in the transmission chain and achieve high-precision indexing and positioning. At the same time, the gear disk meshing has the characteristics of large contact area and strong load-bearing capacity. Combined with the layout of this invention close to the cutting point, it can directly provide strong rigid support near the force point, avoiding the tool tip deflection phenomenon caused by the elastic deformation of the cantilever structure in traditional root locking schemes, thereby ensuring the dimensional accuracy and form and position tolerances of the parts.

[0018] 3. This invention achieves smooth control of gear engagement and disengagement by incorporating a floating sleeve and a drive control assembly. The floating sleeve is fitted around the outer periphery of the convex ring and abuts against the moving gear, driving the moving gear through axial movement. This structural design cleverly utilizes the existing space of the convex ring, integrating the anti-polarization function without significantly increasing the overall size of the turret. The drive control assembly drives the floating sleeve in reciprocating motion, resulting in a short motion transmission path and fast response, reliably completing the turret's opening, indexing, and locking actions, thus meeting the high-efficiency and highly automated operation requirements of composite milling and turning machining centers. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort: Figure 1 This is a schematic diagram of the anti-polarization positioning mechanism at the end of a composite milling and turning lifting turret in a preferred embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the internal structure of a composite milling and turning lifting turret end anti-polarization positioning mechanism in a preferred embodiment of the present invention.

[0021] Figure 3 yes Figure 2 Partial cross-sectional view of the anti-polarization positioning mechanism at the end of the lifting turret of the composite milling machine. Detailed Implementation

[0022] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0025] Furthermore, the terms indicating orientation, such as "up, down, front, back, left, right, upper end, lower end, longitudinal," etc., are all based on the posture and position of the device or equipment described in this solution during normal use.

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0027] A preferred embodiment of the present invention provides a composite milling and turning turret end anti-polarization positioning mechanism, such as... Figure 1-3 As shown, the mechanism mainly includes a support frame 10, a turret module 20, an anti-polarization positioning mechanism 30, a rotary drive module 40, a mounting base 50, and a lifting module 60.

[0028] In this embodiment, the mounting base 50 serves as the supporting foundation for the entire mechanism, used to mount the entire mechanism onto the machine tool bed. The mounting base 50 is located at the bottom of the support frame 10, and a lifting assembly 60 is provided on it. The lifting assembly 60 can be a servo motor as used in the prior art, with its drive end fixedly connected to the support frame 10, used to drive the support frame 10 to move along the Z-axis direction on the mounting base 50, realizing the lifting and lowering movement of the turret, thereby adjusting the processing height of the turret module 20 to adapt to the processing requirements of workpieces of different sizes.

[0029] In this embodiment, the support frame 10 has a rectangular structure and serves as the mounting base for the turret module 20. An outwardly protruding ring 11 is integrally formed or fixedly provided on one outer surface of the support frame 10. This ring 11 has a circular structure and provides rotational support for the turret module 20. A clearance opening 12 is provided in the central region of the support frame 10, within the area enclosed by the ring 11, to allow passage of the output shaft of the subsequent rotary drive module 40, ensuring unobstructed power transmission.

[0030] The rotary drive module 40 uses a motor and reduction mechanism from the prior art. Its output shaft passes through the clearance opening 12 on the support frame 10 and is connected to the annular base 21 for transmission, which is used to drive the turret module 20 to rotate precisely.

[0031] The turret module 20 includes an annular base 21. The rear end of the annular base 21 (i.e., the end closer to the support frame 10) is rotatably mounted on the outer circumferential surface of the convex ring 11 via a bearing seat, thereby enabling the turret module 20 to rotate circumferentially relative to the support frame 10. The front end of the annular base 21 (i.e., the end furthest from the support frame 10) has multiple tool holders 22 evenly distributed circumferentially, each tool holder 22 for mounting cutting tools such as lathe tools and milling cutters.

[0032] Specifically, the annular base 21 has multiple through holes 23 corresponding to the tool holders 22. One end of each through hole 23 is connected to the internal cavity of the annular base 21, and the other end extends to the tool mounting hole of the corresponding tool holder 22. The through hole 23 can serve as a channel for coolant or compressed air, enabling precise cooling or chip removal of the cutting area during machining, thus optimizing the functional integration of the turret module 20.

[0033] To prevent cutting fluid, iron filings, and other foreign matter from entering the anti-polarization positioning module 30 during the cutting process and affecting its normal operation, a labyrinth seal structure is provided between the outer edge of the annular base 21 and the convex ring 11. This seal structure forms a sealing barrier through multiple tortuous gaps, effectively protecting the internal precision components.

[0034] To achieve precise locking of the turret after indexing and effectively resist end-point polarization, this embodiment incorporates an anti-polarization positioning module 30 between the annular base 21 and the convex ring 11. This module is located at the front end of the turret module 20 (i.e., near the tool tip). Compared to the traditional approach of placing the positioning mechanism at the root, this layout significantly shortens the lever arm between the cutting force application point and the locking point, thereby improving rigidity from the structural root.

[0035] In this embodiment, the anti-polarization positioning mechanism 30 includes an end face toothed disc assembly, a floating sleeve 33, and a drive control component.

[0036] The end face gear assembly includes a fixed gear disk 31 and a movable gear disk 32. The fixed gear disk 31 is fixedly mounted on the front end face of the convex ring 11 by bolts, and its position is fixed. The movable gear disk 32 is axially movable on the annular base 21 and rotates together with the annular base 21. When the movable gear disk 32 meshes with the fixed gear disk 31, the annular base 21 and the support frame 10 are circumferentially positioned and locked. The annular base is also provided with a compression spring structure 321 on the moving path of the movable gear disk, which provides an elastic force to move towards the fixed gear disk 31. The fixed gear disk 31 is annular, and its rear end face is fixed to the front end face of the convex ring 11. The front end face has an end face toothed structure. The movable gear disk 32 is also annular, and its rear end face has an end face toothed structure that mates with the end face teeth of the fixed gear disk 31. Its front end face is flat and abuts against the compression spring structure 321.

[0037] The floating sleeve 33 is fitted around the outer periphery of the convex ring 11 and can reciprocate along the axial direction of the convex ring 11. The front end face of the floating sleeve abuts against the non-tooth surface area (or annular boss) of the rear end face of the moving gear disk. The axial movement of the floating sleeve 33 will directly promote the engagement of the moving gear disk 32 with the fixed gear disk 31, or allow the moving gear disk 32 to separate from the fixed gear disk 31 under the action of a reset element (such as a spring).

[0038] The drive control assembly is used to drive the floating sleeve 33 to move axially, thereby controlling the meshing state of the gear disc. Furthermore, the drive control assembly includes multiple inertial oscillators 34 and a telescopic control module 35. The telescopic control module 35 can employ existing technologies such as hydraulic cylinders, electric actuators, or electromagnets.

[0039] The inertial oscillator 34 is oscillatingly mounted on the support frame 10. Specifically, each inertial oscillator 34 includes a swing arm 341, the middle of which is hinged to a fixed fulcrum of the support frame 10 via a pin. The first end of the swing arm 341 (facing the floating sleeve 33) is provided with a contact 342, the contact surface of which is an outwardly convex arc shape, used to form point or line contact with the cam profile surface on the outer periphery of the floating sleeve 33 to reduce friction and improve self-locking reliability. The second end of the swing arm 341 is connected to the output end of the telescopic control module 35.

[0040] Multiple inertial oscillators 34 are evenly distributed along the circumference of the floating sleeve 33 to ensure that the resultant driving force on the floating sleeve 33 is uniform and without eccentric load.

[0041] The outer circumferential surface of the floating sleeve 33 is machined with a cam profile surface, which is a wavy profile surface, that is, it is composed of alternating troughs and crests along the circumference. The contact 342 of the inertial oscillator 34 always maintains contact and engagement with this cam profile surface.

[0042] The pressure angle at the trough is smaller than the friction angle, forming a self-locking section; the pressure angle at the crest is larger than the friction angle, forming a non-self-locking section. When the contact 342 enters the self-locking section, a mechanical self-lock is formed between the contact 342 and the cam profile surface, and the floating sleeve 33 is locked in the current axial position; when the contact 342 enters the non-self-locking section, the self-lock is released, and the floating sleeve 33 can move freely axially.

[0043] Furthermore, to limit the circumferential rotation of the floating sleeve 33 during axial movement, this embodiment provides an axial guide pin 36 between the support frame 10 and the floating sleeve 33. The axial guide pin 36 is fixed to the support frame 10, and the floating sleeve 33 has a guide groove 331 that mates with it. The extension direction of the guide groove 331 is parallel to the axis of the turret module 20. With this structure, the floating sleeve 33 can only slide axially and cannot rotate relative to the support frame 10, thereby ensuring that the contact 342 always maintains a predetermined mating relationship with the cam profile surface.

[0044] To further reduce friction and improve response sensitivity, a wear-resistant and friction-reducing layer, such as a copper alloy coating or a self-lubricating bushing, is provided between the inner surface of the floating sleeve 33 and the outer peripheral surface of the convex ring 11.

[0045] The working principle and operation process of this invention are as follows: 1. Indexing State (Unlocked): When the turret needs to be rotated for tool changing or indexing, the telescopic control module 35 drives the inertial oscillator 34 to swing, causing the contact 342 to enter the non-locking section (i.e., the crest position) of the cam profile. Since the pressure angle of the non-locking section is greater than the friction angle, the contact 342 cannot lock the floating sleeve 33. At this time, under the action of the reset element (such as a spring), the floating sleeve 33 moves forward, causing the moving gear plate 32 to separate from the fixed gear plate 31. Subsequently, the rotary drive module 40 drives the annular base 21 to rotate the turret module 20 to the target angle.

[0046] 2. Locking and Anti-polarization State: The telescopic control module 35 drives the inertial oscillator 34 to swing, causing the contact 342 to enter the self-locking section (i.e., the trough position) of the cam profile surface. Since the pressure angle of the self-locking section is less than the friction angle, a mechanical self-lock is formed between the contact 342 and the cam profile surface. In this state, the contact 342 moves the floating sleeve 33 backward, and the moving gear disk 32, under the action of the spring, abuts against and tightly meshes with the fixed gear disk 31, realizing the circumferential rigid locking of the turret module 20.

[0047] During heavy or intermittent cutting, the cutting force acts on the tool tip, generating high-frequency vibrations. These vibrations are transmitted to the floating sleeve 33 through the turret module 20 and the annular base 21. Since the contact 342 is in the self-locking section at the trough of the wave, the vibration energy further enhances the self-locking effect between the contact 342 and the cam profile surface. That is, the greater the cutting force and the stronger the vibration, the less the floating sleeve 33 restricts the moving gear 32 backward, the greater the backward force of the moving gear 32, and the tighter the meshing of the two gears. This "vibration-enhanced locking" mechanism effectively counteracts the end polarization caused by the cantilever structure, ensuring the positional accuracy and machining stability of the tool tip under heavy cutting.

[0048] Through the above structure, this embodiment places the anti-polarization positioning module 30 at the end of the turret (the connection between the annular base 21 and the convex ring 11), which greatly shortens the cutting lever arm. At the same time, by utilizing the self-locking / non-self-locking characteristics of the wave-shaped cam profile surface and combining it with the oscillation drive of the inertial oscillator 34, precise control of the gear meshing state is achieved, and the locking effect is enhanced by the cutting vibration itself. Thus, the polarization at the end of the turret is effectively suppressed under heavy load conditions, which significantly improves the machining accuracy and the accuracy retention of the machine tool.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 composite milling and turning lifting turret end anti-polarization positioning mechanism, characterized in that, The device includes a support frame and a turret module. The outer surface of the support frame is provided with an outwardly protruding ring. The turret module includes an annular base, the rear end of which is rotatably mounted on the protruding ring. An anti-polarization positioning module is provided between the annular base and the protruding ring. The anti-polarization positioning module includes: The end face gear disk assembly includes a fixed gear disk and a movable gear disk arranged opposite to each other, used to realize the indexing and locking of the turret; the fixed gear disk is fixed to the end face of the convex ring, and the movable gear disk is axially movably arranged on the annular base; A floating sleeve is axially reciprocatingly disposed around the convex ring, with its front end face abutting against the movable gear disc; And a drive control component for driving the floating sleeve to move axially forward or backward, so as to control the engagement or disengagement of the fixed gear plate and the moving gear plate.

2. The anti-polarization positioning mechanism at the end of the composite milling and turning lifting turret according to claim 1, characterized in that, The drive control assembly includes multiple inertial oscillators and a telescopic control module; the inertial oscillators are oscillatingly mounted on the support frame, and each inertial oscillator has a contact at its first end facing the floating sleeve for engaging with the cam profile surface on the outer periphery of the floating sleeve; the telescopic control module is used to control the second end of the inertial oscillator to swing forward or backward to drive the floating sleeve to move axially.

3. The anti-polarization positioning mechanism at the end of the composite milling and turning lifting turret according to claim 2, characterized in that, The cam profile is a wavy profile, with the pressure angle at the trough being smaller than the friction angle to form a self-locking section, and the pressure angle at the crest being larger than the friction angle to form a non-self-locking section. When the telescopic control module drives the inertial oscillator to swing and the contact enters the self-locking section, the floating sleeve is locked in an axial position that keeps the fixed toothed disc and the moving toothed disc engaged; when the contact enters the non-self-locking section under the drive of the telescopic control module, the floating sleeve is allowed to move axially to release the engagement between the fixed toothed disc and the moving toothed disc.

4. The anti-polarization positioning mechanism at the end of the composite milling and turning lifting turret according to claim 1, characterized in that, The turret module also includes a plurality of tool holders arranged circumferentially along the outer surface of the annular base; the annular base is provided with a plurality of through holes corresponding one to one of the tool holders; one end of the through hole is connected to the inner cavity of the annular base, and the other end is connected to the tool mounting hole of the corresponding tool holder.

5. The anti-polarization positioning mechanism at the end of the composite milling and turning lifting turret according to claim 2 or 3, characterized in that, The inertial oscillator includes a swing arm hinged to the support frame via a pin. The telescopic control module controls the swing arm to swing around the pin under the action of cutting vibration, thereby driving the contact to move along the cam profile surface.

6. The anti-polarization positioning mechanism at the end of the composite milling and turning lifting turret according to claim 1, characterized in that, The floating sleeve is connected to the support frame via an axial guide pin. The floating sleeve is provided with a guide groove for the axial guide pin to slide. The extension direction of the guide groove is parallel to the axial direction of the turret module to restrict the floating sleeve from rotating relative to the support frame.

7. The anti-polarization positioning mechanism at the end of the composite milling and turning lifting turret according to claim 6, characterized in that, A wear-resistant and friction-reducing layer is provided between the inner surface of the floating sleeve and the outer peripheral surface of the convex ring.

8. The anti-polarization positioning mechanism at the end of the composite milling and turning lifting turret according to claim 1, characterized in that, A labyrinth seal structure is provided between the outer edge of the annular base and the convex ring to prevent cutting fluid and foreign matter from entering the interior of the anti-polarization positioning mechanism.

9. The anti-polarization positioning mechanism at the end of the composite milling and turning lifting turret according to claim 1, characterized in that, The support frame is also provided with a rotary drive module for driving the turret module to rotate; the support frame is provided with a clearance opening to avoid the output shaft of the rotary drive module; the clearance opening is located within the area enclosed by the convex ring.

10. The anti-polarization positioning mechanism at the end of the composite milling and turning lifting turret according to claim 1, characterized in that, It also includes a mounting base, on which a lifting assembly is provided to drive the support frame to move along the Z-axis.

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