Five-axis tilting table machining center

Abstract

The utility model discloses a five -axis turn -over plate type machining center, including base, fixing device and processing device. The fixing device includes first hollow revolving stage, and second and third hollow revolving stage of the movable base length direction, and three revolving stages coaxial arrangement, and the transmission structure in it can all rotate around horizontal axis, and the common formation workpiece's turnover axle. The numerical control revolving stage of processing device can move along the base, and the column is established on the numerical control revolving stage through revolving stage, and the slide can move vertically, and the main shaft box can move horizontally, realizes many degrees of freedom movement. The utility model technical scheme through three revolving stages cooperation support and turnover, greatly enhanced for the clamping rigidity and processing stability of long strip class, large -scale workpiece, avoided the processing interference effectively, expanded the processing range, realized the efficient, high -precision five -dimensional processing of complex workpiece.

Description

Technical Field

[0001] This utility model relates to the field of machining center technology, and in particular to a five-axis flip-type machining center. Background Technology

[0002] Currently, five-axis machining centers on the market typically have the following structures:

[0003] 1. The cradle turntable is equipped with three linear axes and a vertical spindle (or horizontal spindle).

[0004] 2. A horizontal rotary table is used in conjunction with three linear axes and a main shaft that swings up and down (or swings left and right).

[0005] 3. A table without a rotary table, coupled with three linear axes and a spindle capable of swinging up, down, left, and right.

[0006] 4. Tilting worktable, which can swing up and down (tilt), combined with three linear axes and a spindle that can swing left and right.

[0007] Disadvantages of the background technology:

[0008] 1. The cradle turntable structure involves clamping the workpiece onto the turntable's table. The table rotates with the workpiece and can also swing at an angle, achieving five-axis linkage with three linear axes. Because this structure requires the workpiece to not only rotate but also swing at an angle (tilting the workpiece), it is only suitable for machining small workpieces.

[0009] 2. The horizontal rotary table structure features a horizontally positioned turntable that can rotate with the workpiece without requiring an angle of inclination. The spindle can swing up and down, and together with three linear axes, it achieves five-axis linkage. This structure is suitable for machining medium-sized workpieces, especially square or round ones, but it is less suitable for longer workpieces.

[0010] 3. In this structure, the worktable does not participate in rotation or oscillation; both the corner axis and the oscillation axis are on the main spindle. This means the main spindle can oscillate up, down, left, and right (i.e., the change of the main spindle direction is achieved through two corner axes), and together with three linear axes, five-axis linkage is realized. Because the workpiece does not participate in rotation and does not require tilting, this structure is more suitable for processing large workpieces, especially very long ones.

[0011] 4. The workpiece is clamped on the worktable and swings up and down (tilts) with the worktable. Long strip workpieces can be processed. However, since the workpiece needs to be mounted on the worktable, only one large surface and the surrounding side of the workpiece can be processed. The other large surface cannot be processed in one go because it must cooperate with the worktable.

[0012] 5. For elongated workpieces, existing five-axis machining centers are either unsuitable for such shapes or, while capable of machining them, require large equipment with high floor space and costs. Furthermore, all of the aforementioned five-axis machining centers share a common drawback: the workpiece must be clamped on the worktable, and the bottom surface cannot be machined during the machining process. The workpiece must be removed, flipped, and re-clamped using a different fixture to complete the machining. This not only increases fixture and labor costs, but also inevitably leads to a loss of accuracy during re-clamping, significantly impacting machining efficiency.

[0013] In summary, for a large number of long, strip-shaped workpieces, such as aircraft structural components, that require machining in all directions, how to complete the machining in one clamping operation, and further improve accuracy and efficiency, is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0014] The technical solution of this utility model to solve the above-mentioned technical problems is to provide a five-axis flip-type machining center, including a base, a fixing device, and a machining device.

[0015] The fixing device includes a first hollow turntable, a second hollow turntable and a third hollow turntable. The first hollow turntable is fixed on the base, and the second hollow turntable and the third hollow turntable are movably arranged on the base along the length direction of the base, and the first hollow turntable, the second hollow turntable and the third hollow turntable are arranged on the same axis.

[0016] The machining device includes a CNC rotary table, a column, a slide, and a spindle box; the CNC rotary table is movably mounted on the base along the length direction of the base; the column is fixed on the CNC rotary table via the rotary table surface; the slide is movably mounted on the column along the vertical direction; and the spindle box is movably mounted on the slide along the width direction of the base.

[0017] The transmission structures in the first hollow turntable, the second hollow turntable, and the third hollow turntable can all rotate around a horizontal axis, thereby forming a workpiece flipping axis.

[0018] Furthermore, the movement of the CNC rotary table along the length of the base, the movement of the slide, and the movement of the spindle box are driven by a motor and a lead screw mechanism, respectively.

[0019] Furthermore, the rotation of the transmission structure in the first hollow turntable, the transmission structure in the second hollow turntable, and the transmission structure in the third hollow turntable are each driven by an independent motor.

[0020] Furthermore, the movement of the second and third hollow turntables along the length of the base is driven by a motor and a lead screw mechanism, respectively.

[0021] This invention utilizes a high-speed spindle, ideally 30,000 rpm. Existing research has clearly demonstrated that aluminum alloys exhibit a temperature softening effect during ultra-high-speed cutting, with the elastic modulus and yield strength significantly decreasing with increasing temperature. The high temperature in the cutting zone makes the material easier to cut, resulting in minimal cutting forces. This allows the workpiece itself to be rigid enough, even without a worktable. Furthermore, this temperature softening significantly improves machining efficiency and reduces tool wear. Simultaneously, during ultra-high-speed cutting, 90% of the heat from this high-temperature softening effect is carried away by the chips at ultra-high speeds and fast feed rates, with only a small portion transferred to the workpiece and tool. This characteristic results in relatively small thermal deformation of the workpiece during ultra-high-speed cutting of aluminum alloys, contributing to improved machining accuracy. Moreover, this invention allows for complete machining in a single setup, further ensuring stable accuracy.

[0022] The tableless structure allows the workpiece to pass through the hollow turntable and be clamped before being processed directly. Both sides of the workpiece can be processed in one clamping, which greatly simplifies the process and improves efficiency.

[0023] The technical solution of this utility model creatively provides at least three support points by setting up three hollow rotary tables (first, second, and third) and incorporating a transmission structure that can rotate around a horizontal axis within them. For long, strip-shaped workpieces, the third hollow rotary table can serve as an intermediate auxiliary support, effectively preventing bending and vibration caused by the workpiece's own weight and cutting forces. This enables the machine tool to perform heavy-duty machining with larger cutting volumes, while achieving higher machining accuracy and better surface finish, thus overcoming the inherent defect of insufficient rigidity in traditional double rotary table structures.

[0024] Then, by coordinating the movement of the first, second, and third hollow turntables, the following two very important functions can be achieved:

[0025] 1. For workpieces that are not very long (e.g., less than 1 meter) but have very long blanks (e.g., 6 meters long), the spindle performs machining between the first and second hollow rotary tables. After the workpiece is machined, the blank can be moved to the right a distance (approximately the length of the workpiece) by the third hollow rotary table moving along the length of the base. Then, the first and second hollow rotary tables re-clamp the workpiece for the second stage of machining. This cycle can automatically machine the entire long blank, which is not only highly efficient but also requires no manual intervention.

[0026] 2. For longer workpieces, the workpiece is clamped between the first and third hollow rotary tables. The second hollow rotary table plays a crucial supporting role in the middle, preventing insufficient rigidity of longer workpieces during cutting. Since the second hollow rotary table for support is movable along the length of the base, it will not obstruct the workpiece machining process. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the five-axis flip-plate machining center described in this utility model.

[0029] Explanation of icon numbers:

[0030] 1. Base; 21. First hollow rotary table; 22. Second hollow rotary table; 23. Third hollow rotary table; 31. CNC rotary table; 32. Column; 33. Slide; 34. Spindle box. Detailed Implementation

[0031] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0032] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0033] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "several" or "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] This utility model proposes a five-axis flip-plate machining center, aiming to provide a new type of five-axis machining center that can complete machining in one clamping, which can significantly improve efficiency, better guarantee accuracy, and save labor.

[0037] The five-axis flip-plate machining center proposed in this utility model will be described below in specific embodiments:

[0038] In the technical solution of this embodiment, such as Figure 1 As shown, a five-axis flip-type machining center includes a base 1, a fixing device, and a machining device.

[0039] The fixing device includes a first hollow turntable 21, a second hollow turntable 22 and a third hollow turntable 23. The first hollow turntable 21 is fixed on the base 1. The second hollow turntable 22 and the third hollow turntable 23 are movably arranged on the base 1 along the length direction of the base 1, and the first hollow turntable 21, the second hollow turntable 22 and the third hollow turntable 23 are arranged on the same axis.

[0040] The machining device includes a CNC rotary table 31, a column 32, a slide 33, and a spindle box 34; the CNC rotary table 31 is movably mounted on the base 1 along the length direction of the base 1; the column 32 is fixed on the CNC rotary table 31 via the rotary table surface; the slide 33 is movably mounted on the column 32 along the vertical direction; and the spindle box 34 is movably mounted on the slide 33 along the width direction of the base 1.

[0041] The transmission structures in the first hollow turntable 21, the second hollow turntable 22, and the third hollow turntable 23 can all rotate around a horizontal axis, thereby forming a workpiece flipping axis.

[0042] Furthermore, the movement of the CNC rotary table 31 along the length of the base 1, the movement of the slide 33, and the movement of the spindle box 34 are driven by a motor and a lead screw mechanism, respectively. The lead screw transmission mechanism is existing technology and will not be described in detail here.

[0043] Specifically, the CNC rotary table 31 includes a rotary table body and a rotary table surface rotatably connected to the rotary table body. The rotary table body is movably mounted on the base 1, and the column 32 is fixed to the rotary table surface.

[0044] Furthermore, the rotation of the transmission structure in the first hollow turntable 21, the transmission structure in the second hollow turntable 22, and the transmission structure in the third hollow turntable 23 are driven by independent motors.

[0045] Furthermore, the movement of the second hollow turntable 22 and the third hollow turntable 23 along the length of the base 1 is driven by a motor and a lead screw mechanism, respectively.

[0046] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A five-axis flip-plate machining center, comprising a base, a fixing device, and a machining device, characterized in that: The fixing device includes a first hollow turntable, a second hollow turntable and a third hollow turntable. The first hollow turntable is fixed on the base, and the second hollow turntable and the third hollow turntable are movably arranged on the base along the length direction of the base, and the first hollow turntable, the second hollow turntable and the third hollow turntable are arranged on the same axis. The machining device includes a CNC rotary table, a column, a slide, and a spindle box; the CNC rotary table is movably mounted on the base along the length direction of the base; the column is fixed on the CNC rotary table via the rotary table surface; the slide is movably mounted on the column along the vertical direction; and the spindle box is movably mounted on the slide along the width direction of the base. The transmission structures in the first hollow turntable, the second hollow turntable, and the third hollow turntable can all rotate around a horizontal axis, thereby forming a workpiece flipping axis.

2. The five-axis flip-plate machining center according to claim 1, characterized in that: The movement of the CNC rotary table along the length of the base, the movement of the slide, and the movement of the spindle box are driven by a motor and a lead screw mechanism, respectively.

3. The five-axis flip-plate machining center according to claim 1, characterized in that: The rotation of the transmission structure in the first hollow turntable, the transmission structure in the second hollow turntable, and the transmission structure in the third hollow turntable are driven by independent motors.

4. The five-axis flip-plate machining center according to claim 1, characterized in that: The movement of the second and third hollow turntables along the length of the base is driven by a motor and a lead screw mechanism, respectively.

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