Angular coordinate double-spindle gantry machine tool

Abstract

The utility model relates to the technical field of machine tools, and discloses an angular coordinate double-spindle gantry machine tool which comprises a machine tool base and a gantry frame arranged at the rear end of the machine tool base, a rotary workbench is fixedly arranged on the top face of the machine tool base, and two spindle assembling bodies are arranged on the gantry frame. The two main shaft assembly bodies horizontally move along the gantry frame through independent translation mechanisms; and the axes of the main shafts in the two main shaft assemblies are coplanar with the rotation axis of the rotary worktable. The utility model has the beneficial effect of high processing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of machine tool technology, and in particular to a dual-spindle angular coordinate gantry machine tool. Background Technology

[0002] A gantry machining center is a machining center where the spindle's Z-axis is perpendicular to the worktable. Its overall structure consists of a gantry frame formed by two columns and a top beam. The spindle assembly moves horizontally along the slide rails of the gantry frame via a sliding saddle. Gantry machining centers are particularly suitable for machining large and complex-shaped workpieces. Currently, most common gantry machine tools use a single-spindle structure with a linear motion worktable, which is very inconvenient and results in low machining efficiency when machining large, disc-shaped workpieces with equally spaced holes. Utility Model Content

[0003] In order to solve the above-mentioned problems in the prior art, this utility model provides an angular coordinate dual-spindle gantry milling machine tool that is suitable for machining equally divided hole systems of large disc-shaped workpieces and effectively improves machining efficiency and geometric accuracy.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A dual-spindle gantry milling machine with angular coordinates includes a machine base and a gantry frame disposed at the rear end of the machine base. A rotary table is fixed on the top surface of the machine base. Two spindle assemblies are disposed on the gantry frame, and both spindle assemblies move horizontally along the gantry frame via independent translation mechanisms. The axes of the spindles in the two spindle assemblies are coplanar with the rotation axis of the rotary table. When any spindle assembly moves to its innermost limit position via the translation mechanism, the axis of the spindle of that assembly is collinear with the rotation axis of the rotary table. When the two spindle assemblies move away from the two extreme positions of the gantry frame, the axes of the spindles in the two spindle assemblies are symmetrically distributed about the rotation axis of the rotary table, and the distance between the spindles in the two spindle assemblies is greater than the diameter of the rotary table.

[0006] By adopting the above technical solution, this type of gantry machine tool is suitable for high-precision machining of angular coordinates of disc-shaped parts. The workpiece to be machined is mounted on a rotary worktable, and the two spindle assemblies move through their respective independent translation mechanisms. After reaching the set position, they remain stationary. In conjunction with the angular coordinates of the rotary worktable, the two spindles can simultaneously machine different areas of the same workpiece, which significantly improves the machining efficiency and the accuracy of the hole system angular coordinates. Furthermore, the operation is convenient and simplifies the machining process.

[0007] Preferably, the gantry frame includes a box-shaped crossbeam and box-shaped columns integrally connected to the lower ends of the box-shaped crossbeam. A horizontal front guide rail is provided at the lower front side of the box-shaped crossbeam, and a horizontal upper guide rail is provided on the upper side of the box-shaped crossbeam. Both main shaft assemblies are simultaneously slidably connected to the front and upper guide rails. This dual-rail layout of the front and upper guide rails makes the load-bearing capacity of the box-shaped crossbeam on the main shaft assemblies more stable, effectively improving Z-axis rigidity; furthermore, the two main shaft assemblies share the front and upper guide rails, resulting in higher sliding accuracy.

[0008] Preferably, the spindle assembly includes a saddle and a slide block that slides vertically up and down along the saddle. The spindle is disposed within the slide block. The saddle has an L-shaped structure. An upper slide block, which is slidably connected to an upper guide rail, is fixed to the horizontal side of the saddle, and a front slide block, which is slidably connected to a front guide rail, is fixed to the vertical side of the saddle. This dual-track layout, combined with the double-slide block structure of the L-shaped saddle, ensures uniform load distribution on the saddle, significantly reduces vibration amplitude during machining, and effectively improves machining accuracy.

[0009] Preferably, the front side of the box-shaped crossbeam has horizontally distributed cavities in the area above the front guide rail, and the translation mechanism is disposed in the cavity. The translation mechanism includes a lead screw disposed in the cavity and a motor connected to the outer end of the lead screw. The two ends of the lead screw are connected to the box-shaped crossbeam through rotating seats. The lead screw is provided with a lead screw seat, and the lead screw seat is fixedly connected to the vertical side of the slide saddle.

[0010] Preferably, the lead screws in the two translation mechanisms are parallel and staggered vertically, with the ratio of the lead screw length to the horizontal length of the box-shaped crossbeam configured as 0.55-0.7. This arrangement, on the one hand, reduces the likelihood of mechanical interference during the movement of the two main shaft assemblies, and on the other hand, reduces the length of a single lead screw, increasing its rigidity and thus improving repeatability.

[0011] Preferably, one spindle assembly has a sensor mounted on its slide saddle, and the other spindle assembly has a horizontal support mounted on its slide saddle. A sensing block is mounted on the horizontal support, and the sensing block is horizontally slidably connected to the horizontal support. The sensing block and the sensing element are connected by fasteners. When the sensor detects the sensing block, both spindle assemblies stop moving. Because the two spindles work synchronously and collaboratively, collision prevention is achieved through the cooperation of the sensor and the sensing block; that is, when the distance between the two spindle assemblies is less than a preset value, they stop moving, providing safety protection. Furthermore, the preset distance can be adjusted by moving the sensing block.

[0012] Preferably, a box-shaped reinforcing plate is provided between the rear ends of the box-shaped columns. The box-shaped reinforcing plate, box-shaped columns, and box-shaped crossbeams are an integral structure. A clearance passage for workpieces is provided on the lower side of the box-shaped reinforcing plate. The box-shaped reinforcing plate further enhances the rigidity and strength of the gantry frame.

[0013] Preferably, the maximum distance between the two spindles in the two-spindle assembly is configured as α, the diameter of the rotary table is configured as β, and the horizontal length of the gantry frame is configured as γ. The ratio of α / β is configured as 1.3-1.5, and the ratio of α / γ is configured as 0.5-0.6. By combining the coplanar design of the spindle axes and the rotary table with the α / β parameter configuration, it is ensured that the two spindles can both collaboratively process the same area and independently process symmetrical areas, covering the full-size surface of the workpiece.

[0014] Preferably, tool magazines are provided at both ends of the gantry frame. The tool magazines enable automatic tool changing.

[0015] Therefore, this utility model has the beneficial effects of high processing efficiency and high processing precision. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one structure of the present utility model.

[0017] Figure 2 for Figure 1 The front view.

[0018] Figure 3 for Figure 1 Top view.

[0019] Figure 4 This is an exploded view of the spindle assembly and gantry frame.

[0020] Figure 5 This is a schematic diagram showing one of the spindles moving to the center position of the rotary table.

[0021] Figure 6 for Figure 1 Another perspective view.

[0022] Figure 7 for Figure 6 A magnified view of a portion of point A in the middle. Detailed Implementation

[0023] To make the technical problem to be solved, the technical solution, and the beneficial technical effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and several exemplary embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the scope of protection of the present utility model.

[0024] It should be understood that the terms "first," "second," etc., used herein are for descriptive purposes only and should not be construed as indicating or implying relative importance, nor should they be construed as implicitly specifying the number of technical features indicated. Features defined with "first" or "second" may explicitly or implicitly indicate the inclusion of at least one of those features. In this embodiment, the position near the center of the gantry frame is the inner end, and the positions near both ends of the gantry frame are the outer ends.

[0025] like Figures 1-5 The illustrated dual-spindle angular coordinate gantry milling machine includes a machine base 1 and a gantry frame 2 located at the rear end of the machine base 1. Tool magazines 60 are provided at both ends of the gantry frame 2. A rotary table 3 is fixedly mounted on the top surface of the machine base 1. Two spindle assemblies 4 are mounted on the gantry frame 2. Both spindle assemblies 4 move horizontally along the gantry frame 2 via independent translation mechanisms 5. The axes of the spindles 44 in the two spindle assemblies 4 are coplanar with the rotation axis of the rotary table 3. When any spindle assembly 4 moves to its innermost limit position via the translation mechanism 5, the axis of the spindle 44 of that spindle assembly 4 is collinear with the rotation axis of the rotary table 3. When the two spindle assemblies 4 move away to their respective limit positions at both ends of the gantry frame 2, the axes of the spindles 44 in the two spindle assemblies 4 are symmetrically distributed about the rotation axis of the rotary table 3, and the distance between the spindles 44 in the two spindle assemblies 4 is greater than the diameter of the rotary table 3.

[0026] The gantry frame 2 includes a box-shaped crossbeam 20 and box-shaped columns 21 connected to the lower ends of the box-shaped crossbeam 20. A box-shaped reinforcing plate 24 is provided between the rear ends of the box-shaped columns 21. The box-shaped reinforcing plate 24, the box-shaped columns 21, and the box-shaped crossbeam 20 are an integral structure. A clearance passage 240 for avoiding workpieces is provided on the lower side of the box-shaped reinforcing plate 24. A horizontal front guide rail 22 is provided at the lower end of the front side of the box-shaped crossbeam 20, and a horizontal upper guide rail 23 is provided on the upper side of the box-shaped crossbeam 20. Both main shaft assemblies 4 are simultaneously slidably connected to the front guide rail 22 and the upper guide rail 23.

[0027] The spindle assembly 4 includes a slide saddle 40 and a slide block 41 that slides and moves vertically up and down along the slide saddle 40. The spindle 44 is disposed inside the slide block 41. The slide saddle 40 has an L-shaped structure. An upper slide block 42 that is slidably connected to the upper guide rail 23 is fixed on the horizontal side of the slide saddle 40, and a front slide block 43 that is slidably connected to the front guide rail 22 is fixed on the vertical side of the slide saddle 40. The lifting mechanism of the slide block and the motor mechanism of the spindle are both general structures and will not be described in detail in this application.

[0028] like Figure 4As shown, the front side of the box-shaped crossbeam 20 has horizontally distributed cavities 200 located above the front guide rail 22. The translation mechanism 5 is disposed within the cavity 200. The translation mechanism 5 includes a lead screw 50 disposed within the cavity 200 and a motor 51 connected to the outer end of the lead screw 50. The two ends of the lead screw 50 are connected to the box-shaped crossbeam 20 via rotating seats 52. A lead screw seat 53 is provided on the lead screw 50, and the lead screw seat 53 is fixedly connected to the vertical side of the slide saddle 40. In some embodiments, the lead screws 50 in the two translation mechanisms 5 are parallel and staggered vertically, and the ratio of the length of the lead screw 50 to the horizontal length of the box-shaped crossbeam 20 is configured to be 0.55-0.7. By reasonably configuring the length ratio of the lead screw to the box-shaped crossbeam, the overall machining of the workpiece on the rotary worktable is satisfied while minimizing the lead screw length (in order to improve the strength of the lead screw and ensure stroke accuracy).

[0029] like Figure 6 and Figure 7 As shown, a sensor 45 is provided on the slide saddle 40 of one spindle assembly 4, and a horizontal support 46 is provided on the slide saddle 40 of the other spindle assembly 4. A sensing block 47 is provided on the horizontal support 46. The sensing block 47 is horizontally slidably connected to the horizontal support 46, and the sensing element is connected to the sensing block 47 by fasteners. When the sensor 45 detects the sensing block 47, the two spindle assemblies 4 stop moving. In some embodiments, the sensor can be a proximity sensor, a micro switch, a laser reflection sensor, etc. In this embodiment, a proximity switch is used. When the proximity switch detects the signal of the sensing block, the spindle assembly stops moving, thereby preventing collisions between the two spindle assemblies (collisions caused by mechanical failure or human error).

[0030] like Figure 2 As shown, the maximum distance between the two spindles 44 in the two spindle assemblies 4 is configured as α, the diameter of the rotary table 3 is configured as β, and the horizontal length of the gantry frame 2 is configured as γ, wherein the ratio of α / β is configured as 1.3-1.5, and the ratio of α / γ is configured as 0.5-0.6. In some embodiments, α is configured as 1.6m, β as 1.15m, and γ as 2.8m.

[0031] Referring to the accompanying drawings, the principle of this utility model is as follows: The workpiece to be processed is mounted on a rotary worktable, and the two spindle assemblies move through their respective independent translation mechanisms. In conjunction with the angular coordinates of the rotary worktable, the two spindles can synchronously process different areas of the same workpiece, achieving all-round processing of the workpiece. Through the collaborative processing of the two spindles, the processing efficiency of the workpiece is greatly improved, and the processing procedure can be simplified.

[0032] In the description of this utility model, it should be understood that the directions or positional relationships indicated by up, down, left, right, inner end, outer end, one end, and the other end are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the purpose of more clearly describing the technical solution of this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as a limitation of this utility model.

[0033] Although specific embodiments of the present invention are described in detail herein, they are given for illustrative purposes only and should not be construed as limiting the scope of the present invention. Various substitutions, alterations, and modifications may be conceived without departing from the spirit and scope of the present invention.

Claims

1. An angular coordinate double-spindle gantry machine tool, comprising a machine tool base (1) and a gantry frame (2) arranged at the rear end of the machine tool base (1), characterized in that, The top surface of the machine tool base (1) is fixed with a rotary worktable (3), the gantry frame (2) is provided with two spindle assemblies (4), and the two spindle assemblies (4) are moved horizontally along the gantry frame (2) through independent translation mechanisms (5); The axis of the spindle (44) in the two spindle assemblies (4) is coplanar with the rotation axis of the rotary worktable (3); when any one spindle assembly (4) is moved to the innermost end limit position through the translation mechanism (5), the axial direction of the spindle (44) of the spindle assembly (4) is collinear with the rotation axis of the rotary worktable (3); when the two spindle assemblies (4) are moved away to the limit positions at the two ends of the gantry frame (2), the axes of the spindles (44) in the two spindle assemblies (4) are symmetrically distributed about the rotation axis of the rotary worktable (3), and the distance between the spindles (44) in the two spindle assemblies (4) is greater than the diameter of the rotary worktable (3).

2. A dual-gantry planer according to claim 1, wherein, The gantry frame (2) comprises a box-shaped cross beam (20) and box-shaped columns (21) connected in one piece with the lower sides of the two ends of the box-shaped cross beam (20), the lower end of the front side of the box-shaped cross beam (20) is provided with a horizontal front guide rail (22), the upper side of the box-shaped cross beam (20) is provided with a horizontal upper guide rail (23), and the two spindle assemblies (4) are simultaneously and slidably connected with the front guide rail (22) and the upper guide rail (23).

3. A dual-gantry planer according to claim 2, wherein, The spindle assembly (4) comprises a slide saddle (40) and a slide ram (41) vertically sliding and lifting along the slide saddle (40), the spindle (44) is arranged in the slide ram (41), the slide saddle (40) has an L-shaped structure, the horizontal side of the slide saddle (40) is fixedly provided with an upper sliding block (42) slidably connected with the upper guide rail (23), and the vertical side of the slide saddle (40) is fixedly provided with a front sliding block (43) slidably connected with the front guide rail (22).

4. A dual-gantry planer according to claim 3, wherein, The front side of the box-shaped cross beam (20) is provided with horizontally distributed cavities (200) in the upper side area of the front guide rail (22), and the translation mechanism (5) is arranged in the cavity (200); The translation mechanism (5) comprises a lead screw (50) arranged in the cavity (200) and a motor (51) connected with the outer end of the lead screw (50), the two ends of the lead screw (50) are connected with the box-shaped cross beam (20) through rotating seats (52), the lead screw (50) is provided with a screw seat (53), and the screw seat (53) is fixedly connected with the vertical side of the slide saddle (40).

5. A dual-gantry planer according to claim 4, wherein, The lead screws (50) in the two translation mechanisms (5) are parallel and vertically staggered, and the ratio of the length of the lead screw (50) to the horizontal length of the box-shaped cross beam (20) is configured to be 0.55-0.

7.

6. A dual-gantry planer according to claim 3, wherein, One of The saddle (40) of the main shaft assembly (4) is provided with a sensor (45), the saddle (40) of the other main shaft assembly (4) is provided with a horizontal support (46), the horizontal support (46) is provided with a sensing block (47), the sensing block (47) is in horizontal sliding connection with the horizontal support (46), and the sensing block (47) and the sensing piece are connected through a fastener; when the sensor (45) detects the sensing block (47), the two main shaft assemblies (4) stop moving.

7. The angular coordinate dual-spindle gantry machine tool according to claim 2, characterized in that, Box type reinforcing plates (24) are arranged between the rear ends of the box type upright columns (21), the box type reinforcing plates (24), the box type upright columns (21) and the box type cross beams (20) are in an integrated structure, and the undersides of the box type reinforcing plates (24) are provided with avoiding channels (240) for avoiding workpieces.

8. The angular coordinate dual-spindle gantry machine tool according to claim 1, characterized in that, The maximum distance of the two main shafts (44) in the two main shaft assemblies (4) is configured as alpha, the diameter of the rotary workbench (3) is configured as beta, and the length of the gantry frame (2) in the horizontal direction is configured as gamma, wherein the ratio of alpha / beta is configured as 1.3-1.5, and the ratio of alpha / gamma is configured as 0.5-0.

6.

9. The angular coordinate dual-spindle gantry machine tool according to claim 1, characterized in that, The gantry frame (2) is provided with a tool magazine (60) at each end.

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