A CNC gantry milling machine for planar milling of workpieces

Abstract

This invention relates to the field of milling technology and discloses a CNC gantry milling machine for planar milling of workpieces. The height of the sliding block is controlled by a lead screw, and the setting height of clamping element one is adjusted, allowing the workpiece to be angled around the right-angled corner of clamping block bracket two. During adjustment, the right-angled corners of clamping block bracket one and two always maintain a clamping state on the workpiece, and the force-applying arc sleeve one and two always provide stable pushing to the corresponding clamping block bracket. This ensures that at any angle within a preset range, the cutting force generated by the milling operation is canceled out by clamping elements one and two, avoiding the cumulative positioning error caused by frequent clamping and loosening in traditional multiple clamping operations, thereby improving the positional accuracy and machining efficiency between the machining surfaces. This solves the problem that when machining multi-faceted workpieces on a CNC gantry milling machine, repeated clamping, posture adjustment, and re-fixing are required, leading to reduced machining efficiency, increased cumulative errors, and cumbersome processes.

Description

Technical Field

[0001] This invention relates to the field of milling technology, specifically to a CNC gantry milling machine for planar milling of workpieces. Background Technology

[0002] A CNC gantry milling machine typically consists of a bed, a longitudinally movable worktable (X-axis), a gantry frame spanning the bed, and a milling mechanism mounted on one side of the gantry beam. Driven by the gantry frame, the milling mechanism can move along the beam direction (Y-axis) and vertically (Z-axis). During machining, the milling cutter head rotates horizontally, and its milling surface is horizontal. The workpiece must be pre-fixed above the worktable, and the horizontal milling by the milling cutter head achieves planar machining.

[0003] However, existing technical solutions are mainly designed for machining requirements on a single horizontal plane. When a workpiece (such as a cuboid or other polyhedral structure) has at least two planes at different angles to be machined, after each plane is milled, the workpiece must be released from clamping, its posture readjusted, and the next plane to be machined must be horizontal before being fixed again. This process not only requires changing the appropriate fixture or pad according to the new posture of the workpiece, but also requires repeated operations of loosening, aligning, and tightening. Frequent reclamping not only significantly reduces machining efficiency, but also easily introduces cumulative errors due to multiple positioning, affecting the positional accuracy between the machined surfaces; at the same time, enterprises need to pre-equip themselves with various specifications of special fixtures to adapt to the clamping requirements of different postures, further increasing equipment investment costs and process preparation cycles. The above-mentioned defects seriously restrict the flexibility and economy of CNC gantry milling machines in machining complex workpieces with multiple angles. Summary of the Invention

[0004] The purpose of this invention is to provide a CNC gantry milling machine for milling the plane of a workpiece. This invention solves the problem that when a CNC gantry milling machine mills the plane of a workpiece, if there is a non-horizontal surface to be machined, it is necessary to repeatedly loosen and loosen the clamp, adjust the posture, and re-fix it, which leads to reduced processing efficiency, increased cumulative error from multiple positioning, and the need to equip it with a variety of special fixtures, resulting in cumbersome processes, high costs, and difficulty in guaranteeing accuracy.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a CNC gantry milling machine for workpiece plane milling, comprising: The machine tool, a worktable mounted on the upper side of the machine tool that can move longitudinally, a gantry mechanism spanning the upper side of the machine tool, and a milling mechanism installed on one side of the gantry mechanism, wherein the gantry mechanism drives the milling mechanism to move in the horizontal and vertical directions, and the milling surface of the milling cutter head of the milling mechanism is a horizontal plane; The fastener mechanism is assembled on the upper side of the workbench. The fastener mechanism includes a base platform. The upper side of the base platform is provided with a fixedly installed clamping member two and a movably installed clamping member one. A push seat is provided on one side of the clamping member one, and the clamping member one is movably lifted and lowered on one side of the push seat. The clamping member 1, pushed by the pusher seat, clamps the workpiece in the middle. Adjusting the height of the clamping member 1 on one side of the pusher seat can adjust the working plane of the workpiece. The pusher seat and the clamping member 1 are adapted to the adjusted state of the workpiece and fix it in place.

[0006] As a further description of the above technical solution: the clamping component one includes a force-applying arc sleeve one, and a clamping block bracket one is rotatably mounted on the inner side of the force-applying arc sleeve one. The clamping block bracket one has a right-angle opening on one side for placing a corner of the workpiece, and the force-applying arc sleeve one has bearing brackets at both ends for rotatably assembling the clamping block bracket one.

[0007] As a further description of the above technical solution: the clamping member two includes a force-applying arc sleeve two and a clamping block bracket two that is fitted and rotatably disposed inside the force-applying arc sleeve two. The force-applying arc sleeve two, the clamping block bracket two and the force-applying arc sleeve one, the clamping block bracket one are the same structural components. A fixed seat is integrally formed on one side of the force-applying arc sleeve two, and the fixed seat is fixedly connected to the upper side of the base platform.

[0008] As a further description of the above technical solution: the bottom surface height of the right-angle opening on one side of the clamping block bracket is lower than the height of the rotation axis of the clamping block bracket.

[0009] As a further description of the above technical solution: an avoidance groove is provided at the corner position of the right-angle opening on one side of the clamping block bracket.

[0010] As a further description of the above technical solution: a second lead screw is provided on one side of the push seat, a sliding block is fixedly provided on one side of the force-applying arc sleeve, a sliding groove is provided on one side of the push seat for the sliding block to be adapted to slide and fit, and the second lead screw is threadedly connected to the sliding block.

[0011] As a further description of the above technical solution: an assembly groove is provided on the upper side of the base platform, and a lead screw is rotatably assembled inside the assembly groove; The push seat is slidably fitted inside the assembly groove. The push seat is movably fitted with a sleeve through a sliding hole on its lower side. The sleeve is threadedly connected to the lead screw. Both ends of the sleeve are provided with retaining flanges. A tension spring is provided on the side of the sleeve near the clamping member. A limit protrusion is provided on the arc surface of the sleeve. A limit groove is provided inside the sliding hole. The limit protrusion is slidably fitted inside the limit groove.

[0012] As a further description of the above technical solution: A synchronous tensioning member is provided between the first clamping bracket and the second clamping bracket to synchronize their rotation states; The synchronous tensioning component includes a crossbar 1 fixedly connected to one side of the clamping block bracket 1, and a crossbar 2 fixedly connected to one side of the clamping block bracket 2. The surface of the crossbar 2 is provided with a movable groove, and a pin that can move inside the movable groove is fixedly connected to the lower side of the crossbar.

[0013] As a further description of the above technical solution: a chassis is rotatably mounted on the underside of the base platform, and fixing components are provided on both sides of the chassis. The fixing components are fastened in grooves on the surface of the worktable, and bolts are provided on both sides of the base platform to lock the chassis in a rotating state.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: 1. By controlling the height of the sliding block through the lead screw two, the setting height of the clamping member one is adjusted, so that the workpiece can be angled around the right-angled corner of the clamping block bracket two as the axis. During this process, the right-angled corners of the clamping block bracket one and clamping block bracket two always maintain the clamping state of the workpiece, and the force-applying arc sleeve one and the force-applying arc sleeve two always provide stable pushing to the corresponding clamping block bracket one and clamping block bracket two. This ensures that at any angle within the preset range, the cutting force generated by the milling mechanism during milling is canceled out by clamping element one and clamping element two, thus guaranteeing that the angle control of the workpiece will not produce adjustment errors due to multiple milling operations. In addition, clamping element one and clamping element two form a wrapping clamping of the workpiece through the right-angle openings of clamping block bracket one and clamping block bracket two, effectively canceling out the cutting force of the milling mechanism and avoiding the cumulative positioning error caused by frequent clamping and loosening in traditional multiple clamping, thereby improving the positional accuracy and processing efficiency between each machining surface.

[0015] 2. The tension spring pulls the push seat towards the clamping part two through the sleeve. When the height of the clamping part one is adjusted to make the workpiece rotate and tilt, the push seat adaptively approaches the clamping part two in the form of sliding on the surface of the sleeve. This prevents the clamping part one and the clamping part two from becoming loose during the rotation of the workpiece, avoids interference with the workpiece's posture adjustment, and thus ensures the continuity and stability of the workpiece angle adjustment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the workpiece clamping state of the firmware mechanism of the present invention; Figure 3 This is a schematic diagram of the firmware mechanism structure of the present invention; Figure 4 This is a schematic diagram of the clamping member 1, clamping member 2, and synchronous tensioning member of the present invention; Figure 5This is a schematic diagram of the base platform and chassis structure of the present invention; Figure 6 This is a schematic diagram of the push seat structure of the present invention; Figure 7 This is a schematic diagram of the disassembled push seat structure of the present invention; Figure 8 This is a planar schematic diagram of the fastener mechanism of the present invention clamping the workpiece.

[0017] In the diagram: 11. Machine tool; 12. Gantry mechanism; 13. Milling mechanism; 14. Worktable; 20. Fastener mechanism; 21. Base plate; 211. Assembly slot; 22. Push seat; 221. Lead screw one; 222. Sleeve; 223. Tension spring; 224. Lead screw two; 225. Limiting protrusion; 226. Flange; 227. Sliding hole; 228. Limiting slide groove; 23. Clamping part one; 231. Force-applying arc sleeve one; 232. Sliding block; 233. Clamping block bracket one; 24. Clamping part two; 241. Force-applying arc sleeve two; 242. Fixed seat; 243. Clamping block bracket two; 25. Synchronous tensioning part; 251. Crossbar one; 252. Crossbar two; 253. Pin; 254. Movable slot; 26. Chassis; 261. Fixing part. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings.

[0020] Combination Figures 1 to 8 This invention relates to a three-axis CNC milling machine, specifically a CNC gantry milling machine for planar milling of workpieces. The CNC gantry milling machine includes a machine tool 11, a worktable 14 mounted on the upper side of the machine tool 11 and capable of longitudinal movement, a gantry mechanism 12 spanning the upper side of the machine tool 11, and a milling mechanism 13 mounted on one side of the gantry mechanism 12. Before machining, the workpiece is pre-fixed on the upper side of the worktable 14, and the worktable 14 can drive the workpiece to reciprocate longitudinally; the gantry mechanism 12 can drive the milling mechanism 13 to move in the transverse and vertical directions, and the milling surface of the milling cutter head of the milling mechanism 13 is horizontal. By moving the milling mechanism 13 through the gantry mechanism 12, the workpiece fixed on the surface of the worktable 14 can be milled flat.

[0021] In a three-axis CNC milling machine, when there are at least two planes to be machined at different angles on the workpiece surface, after each plane is milled, the workpiece must be released from clamping, its posture readjusted, and the next plane to be machined must be horizontal before being fixed again. This process not only requires changing the appropriate fixture or pad according to the new workpiece posture, but also requires repeatedly performing operations such as loosening, aligning, and tightening. Frequent reclamping not only significantly reduces machining efficiency, but also easily introduces cumulative errors due to multiple positioning, thus affecting the positional accuracy between the machined surfaces.

[0022] To address this issue, the present invention solves the above problems by assembling a fastener mechanism 20 on the upper side of the worktable 14.

[0023] The fastener mechanism 20 includes a base 21. The upper side of the base 21 is provided with a fixedly installed clamping member 24 and a movable clamping member 23. A push seat 22 is provided on one side of the clamping member 23, and the clamping member 23 is movably lifted and lowered on one side of the push seat 22.

[0024] During machining, clamping member 23, pushed by pusher seat 22, clamps the workpiece between clamping member 23 and clamping member 24, thus clamping and fixing the workpiece. At this time, one working surface of the workpiece can be milled. After milling this surface, the height of clamping member 23 on one side of pusher seat 22 is adjusted to adjust the working plane of the workpiece so that the other working surface of the workpiece is parallel to the milling surface of milling mechanism 13. At the same time, pusher seat 22 and clamping member 23 adapt to the adjusted posture of the workpiece and re-clamp it.

[0025] Combination Figure 4 and Figure 8 Specifically, the clamping component 23 includes a force-applying arc-shaped sleeve 231, with a clamping block bracket 233 rotatably mounted on the inner side of the force-applying arc-shaped sleeve 231. One side of the clamping block bracket 233 has a right-angle opening for placing a corner of the workpiece. Both ends of the force-applying arc-shaped sleeve 231 have bearing brackets for rotatably assembling the clamping block bracket 233. Supported by the bearing brackets, the clamping block bracket 233 can rotate freely within a preset angle range on one side of the force-applying arc-shaped sleeve 231; and, under any rotational posture of the clamping block bracket 233 within the preset angle, the force-applying arc-shaped sleeve 231 can provide stable pushing force to the clamping block bracket 233.

[0026] Clamping component 24 includes a force-applying arc-shaped sleeve 241 and a clamping block bracket 243 that is rotatably disposed inside the force-applying arc-shaped sleeve 241. The force-applying arc-shaped sleeve 241 and clamping block bracket 243 are the same structural components as the force-applying arc-shaped sleeve 231 and clamping block bracket 233. The clamping block bracket 243 can also rotate freely within a preset angle range on one side of the force-applying arc-shaped sleeve 241. Furthermore, under any rotational posture of the clamping block bracket 243 within the preset angle, the force-applying arc-shaped sleeve 241 can provide stable pushing for the clamping block bracket 243. A fixed seat 242 is integrally formed on one side of the force-applying arc-shaped sleeve 241, and the fixed seat 242 is fixedly connected to the upper side of the base platform 21.

[0027] The lower corner of the workpiece needs to be placed inside the right-angle opening of clamping bracket 1 233 and clamping bracket 243. With the fixed seat 242 in the fixed assembly state, the clamping bracket 1 233 can be clamped and fixed between clamping bracket 1 233 and clamping bracket 243 by pushing the movable force-applying arc sleeve 1 231.

[0028] Combined Figures 4 to 6 The push seat 22 has a rotating lead screw 224 on one side, and a sliding block 232 is fixedly installed on one side of the force-applying arc sleeve 231. The push seat 22 has a sliding groove on one side for the sliding block 232 to slide and fit. The lead screw 224 is threadedly connected to the sliding block 232. When the lead screw 224 is rotated, the setting height of the sliding block 232 can be controlled.

[0029] When the workpiece clamped between clamping bracket 1 233 and clamping bracket 243 needs to change its milling surface, simply rotate lead screw 224 to control the height of sliding block 232, causing the workpiece to rotate and tilt until the required milling surface is horizontal, thus simplifying the adjustment operation of the workpiece milling surface. During the workpiece rotation, clamping bracket 1 233 and clamping bracket 243 rotate to adapt to the tilting state of the workpiece, maintaining their right-angle openings to clamp the workpiece. After clamping bracket 1 233 and clamping bracket 243 have adapted to rotate, force-applying arc sleeve 1 231 and force-applying arc sleeve 241 can still apply force to push the corresponding clamping bracket 1 233 and clamping bracket 243, ensuring that clamping bracket 1 233 and clamping bracket 243 can still stably clamp the workpiece after it has rotated.

[0030] Furthermore, in combination Figure 8 The bottom surface of the right-angle opening on one side of the clamping block bracket 233 is lower than the height of its rotation axis. This design allows the force-applying arc sleeve 231 to apply force to the clamping block bracket 233 when it pushes it, so that the force can be applied to the side surface of the workpiece through the side of the right-angle opening, thereby providing a stable clamping force for the workpiece.

[0031] Furthermore, in combination Figure 8A clearance groove is provided at the corner of the right-angle opening on one side of the clamping block bracket 233; when the edges and corners of the workpiece are relatively precise, the clearance groove can avoid contact with the edges and corners of the workpiece, thereby preventing damage to the precision structure of the edges and corners of the workpiece.

[0032] Combination Figures 5 to 7 An assembly groove 211 is provided on the upper side of the base 21, and a lead screw 221 is rotatably mounted inside the assembly groove 211.

[0033] The push seat 22 is slidably fitted into the inner side of the assembly groove 211. A sleeve 222 is movably fitted onto the push seat 22 through a sliding hole 227 on its lower side. The sleeve 222 slides along its length within the sliding hole 227. The sleeve 222 is threadedly connected to the lead screw 221. Both ends of the sleeve 222 are provided with retaining flanges 226. These flanges prevent the sleeve 222 from disengaging from the sliding hole 227 and also push the push seat 22. A tension spring 223 is provided on the side of the sleeve 222 near the clamping member 24, pulling the push seat 22 towards the clamping member 24. A limiting protrusion 225 is provided on the arc surface of the sleeve 222, and a limiting groove 228 is provided inside the sliding hole 227. The limiting protrusion 225 slidably fits into the limiting groove 228 to prevent the sleeve 222 from rotating circumferentially within the sliding hole 227.

[0034] Furthermore, when the lead screw 221 rotates, it can push the pusher seat 22 to move through the sleeve 222, causing the pusher seat 22 to push the clamping member 23, providing thrust for clamping the workpiece. During the process of raising the pusher seat 22 to adjust the workpiece milling surface, combined with... Figure 8 When the workpiece is clamped by clamping member 1 23 and clamping member 24, the horizontal distance between them will shorten. To address this, a tension spring 223 is used. When the lead screw 224 is rotated to raise the height of clamping member 1 23, the tension spring 223 will actively pull the push seat 22, causing the push seat 22 to slide towards clamping member 24 on the surface of the sleeve 222. This ensures that clamping member 1 23 and clamping member 24 maintain the clamping state of the workpiece during the adjustment of the workpiece rotation, and stabilizes the workpiece's posture during adjustment. After the workpiece adjustment is completed, simply rotate the lead screw 1 221 again to move the sleeve 222, causing the flange 226 at one end of the sleeve 222 to press against one side of the push seat 22, thus locking and fixing the workpiece clamped by clamping member 1 23 and clamping member 24, facilitating subsequent machining operations on the newly adjusted milling surface of the workpiece.

[0035] Combination Figure 4 A synchronous tensioning member 25 is provided between the clamping block bracket 1 233 and the clamping block bracket 243 to synchronize their rotation.

[0036] The synchronous tensioning component 25 includes a crossbar 251 fixedly connected to one side of the clamping block bracket 233 and a crossbar 252 fixedly connected to one side of the clamping block bracket 243. A movable groove 254 is formed on the surface of the crossbar 252, and a pin 253 movable within the movable groove 254 is fixedly connected to the lower side of the crossbar 251. During the adjustment of the height of the clamping component 23, both the clamping block bracket 233 and the clamping block bracket 243 will rotate. Through the synchronous tensioning component 25, the upward-moving clamping block bracket 233 will actively drive the clamping block bracket 243 to rotate, causing their respective right-angle openings to actively align with the surface corners of the workpiece.

[0037] Combination Figure 1 and Figure 2 A base plate 26 is rotatably mounted on the underside of the base platform 21. Fixing members 261 are provided on both sides of the base plate 26, and these fixing members 261 are fastened into grooves on the surface of the worktable 14, thereby fixing the base plate 26 to the upper surface of the worktable 14. Bolts are provided on both sides of the base platform 21 to lock the base plate 26 in a rotating state. When the base platform 21 rotates to a preset position, the bolts can be used to fix the base platform 21 to the base plate 26.

[0038] 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 CNC gantry milling machine for planar milling of workpieces, characterized in that, include: The machine tool (11), the worktable (14) mounted on the upper side of the machine tool (11) and movable longitudinally, the gantry mechanism (12) spanning the upper side of the machine tool (11), and the milling mechanism (13) installed on one side of the gantry mechanism (12), wherein the gantry mechanism (12) drives the milling mechanism (13) to move in the horizontal and vertical directions, and the milling surface of the milling cutter of the milling mechanism (13) is a horizontal plane; The fastener mechanism (20) is mounted on the upper side of the workbench (14). The fastener mechanism (20) includes a base (21). The upper side of the base (21) is provided with a fixed clamping member two (24) and a movable clamping member one (23). The clamping member one (23) is provided with a push seat (22) on one side. The clamping member one (23) is movably raised and lowered on one side of the push seat (22). The clamping member (23) clamps the workpiece in the middle under the push of the push seat (22). The height of the clamping member (23) on one side of the push seat (22) can be adjusted to adjust the working plane of the workpiece. The push seat (22) and the clamping member (23) are adapted to the adjusted state of the workpiece and fix it in place.

2. A CNC gantry milling machine for workpiece plane milling according to claim 1, characterized in that: The clamping component (23) includes a force-applying arc sleeve (231), and a clamping block bracket (233) is rotatably mounted on the inner side of the force-applying arc sleeve (231). A right-angle opening for placing a corner of the workpiece is provided on one side of the clamping block bracket (233), and bearing brackets for rotating and assembling the clamping block bracket (233) are provided at both ends of the force-applying arc sleeve (231).

3. A CNC gantry milling machine for workpiece plane milling according to claim 2, characterized in that: The clamping component two (24) includes a force-applying arc sleeve two (241) and a clamping block bracket two (243) that is fitted and rotatably disposed inside the force-applying arc sleeve two (241). The force-applying arc sleeve two (241), the clamping block bracket two (243), the force-applying arc sleeve one (231), and the clamping block bracket one (233) are the same structural components. A fixed seat (242) is integrally formed on one side of the force-applying arc sleeve two (241), and the fixed seat (242) is fixedly connected to the upper side of the base platform (21).

4. A CNC gantry milling machine for workpiece plane milling according to claim 2 or 3, characterized in that: The bottom surface height of the right-angle opening on one side of the clamp bracket (233) is lower than the height of the rotation axis of the clamp bracket (233).

5. A CNC gantry milling machine for workpiece plane milling according to claim 2 or 3, characterized in that: The clamp bracket (233) has a clearance groove at the corner of the right-angle opening on one side.

6. A CNC gantry milling machine for workpiece plane milling according to claim 2, characterized in that: The push seat (22) is provided with a rotating lead screw (224) on one side, and a sliding block (232) is fixedly provided on one side of the force-applying arc sleeve (231). The push seat (22) is provided with a sliding groove for the sliding block (232) to be adapted to slide and fit. The lead screw (224) is threadedly connected to the sliding block (232).

7. A CNC gantry milling machine for workpiece plane milling according to claim 6, characterized in that: An assembly groove (211) is provided on the upper side of the base (21), and a lead screw (221) is rotatably mounted inside the assembly groove (211). The push seat (22) is slidably fitted inside the assembly groove (211). The push seat (22) is movably fitted with a sleeve (222) through a sliding hole (227) on its lower side. The sleeve (222) is threadedly connected to the lead screw (221). Both ends of the sleeve (222) are provided with flanges (226). A tension spring (223) is provided on the side of the sleeve (222) near the clamping member (24). The arc surface of the sleeve (222) is provided with a limiting protrusion (225). A limiting groove (228) is provided inside the sliding hole (227). The limiting protrusion (225) is slidably fitted inside the limiting groove (228).

8. A CNC gantry milling machine for workpiece plane milling according to claim 3, characterized in that: A synchronous tensioning member (25) is provided between the first clamping bracket (233) and the second clamping bracket (243) to synchronize their rotation. The synchronous tensioning member (25) includes a crossbar 1 (251) fixedly connected to one side of the clamping block bracket 1 (233) and a crossbar 2 (252) fixedly connected to one side of the clamping block bracket 2 (243). The surface of the crossbar 2 (252) is provided with a movable groove (254). A pin (253) that can move inside the movable groove (254) is fixedly connected to the lower side of the crossbar 1 (251).

9. A CNC gantry milling machine for workpiece plane milling according to claim 1, characterized in that: The base (21) is rotatably mounted with a chassis (26) on its lower side. The chassis (26) has fasteners (261) on both sides. The fasteners (261) are fastened in the grooves on the surface of the workbench (14). The base (21) has bolts on both sides to lock the chassis (26) in a rotating state.

Images