Clamp of numerical control milling finish machining buffer frame for rotary additional shaft

Abstract

The utility model discloses a clamp of a numerical control milling finish machining buffer frame for a rotary additional shaft, which relates to the technical field of numerical control machine tool auxiliary clamps and comprises a connecting flange, a clamp main plate, a tail end rotary shaft, a tail seat frame, a limiting and positioning part, a front pressing part, a rear pressing part and a side pressing part. Through cooperative use of the positioning column and the tailstock frame, rapid assembly and disassembly operation of the clamp can be achieved, and through cooperative use of the front pressing air cylinder, the rear pressing air cylinder and the side pressing air cylinder, rapid clamping operation of a workpiece can be achieved; a connecting flange provided with a positioning column can accurately position the center height, a protruding positioning key on an additional fourth shaft flange is used for accurate angle positioning, a cylinder and a hinge mechanism are used for clamping a workpiece, and the characteristic that the cylinder keeps clamping force all the time is used for ensuring that the clamping force of the workpiece is enough at any time point in the machining process; therefore, it is guaranteed that clamping is rapid, positioning is reliable, machining is stable, and the machining period is within 60 seconds through actual application detection.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary fixtures of numerically controlled machine tools, in particular to a fixture of a numerically controlled milling finishing buffer frame for a rotating additional axis. Background Art

[0002] like Figure 8 The product shown is a buffer frame made of die-cast aluminum on a certain type of automobile. Multiple parts of the buffer frame need to be fine-machined. However, in the prior art, the fine-machining of the buffer frame requires that after one position is machined, the direction of the buffer frame must be switched and re-positioned and clamped before the processing can be performed. However, such a processing method requires multiple clampings to complete the fine-machining operation, which makes the fine-machining operation time-consuming and labor-intensive, and is difficult to meet the needs of high-efficiency processing operations. Utility Model Content

[0003] The purpose of the utility model is to provide a fixture for CNC milling finishing buffer frame for rotating additional axis, so as to solve the problem that the finishing operation of buffer frame in the prior art proposed in the above background technology is time-consuming and labor-intensive and difficult to meet the demand of high-efficiency processing operation.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fixture for a CNC milling finishing buffer frame for a rotating additional axis, including a connecting flange coaxially arranged on the fourth rotating axis of a CNC machine tool, a fixture main board coinciding with its axis is arranged on the right side of the connecting flange, a tail end rotating shaft is arranged at the center of the right end of the fixture main board by bolts, the tail end rotating shaft is connected to a tail stock frame by a bearing, and the bottom end of the tail stock frame is fixed on the machine bed of the CNC machine tool by bolts; a limiting positioning part is arranged at the center of the top surface of the fixture main board, and a front clamping part is arranged on the left side of the limiting positioning part, a rear clamping part is arranged on the right side near the front side, and a side clamping part is arranged on the right side near the rear side.

[0005] Preferably, the connecting flange includes a flange plate, on the left side of which a coaxial cylindrical positioning column protruding to the left is arranged, and on the outer side of the positioning column a plurality of fixing screws and a positioning key groove that cooperates with a protruding key of a fourth axis flange are arranged on the same circumference of the left side of the flange; two clamp mounting holes are symmetrically arranged on the outer side of the positioning column with the axis of the flange plate and the clamp main board is fixedly connected by two bolts.

[0006] Preferably, the clamp main board is rectangular in shape, and its center line coincides with the axis line of the connecting flange, and a precise rotation center positioning hole is provided on the right side of the clamp main board.

[0007] Preferably, the tail end rotating shaft is coaxially arranged with the connecting flange, including a precision step shaft arranged in the rotation center positioning hole by bolts, a precision slewing bearing is installed on the outer side of the precision step shaft by interference fit, and a tail stock is installed on the outer side of the precision slewing bearing by interference fit.

[0008] Preferably, the tailstock frame is provided with an inwardly concave circular groove near the top end, and is installed with an interference fit with the precision slewing bearing on the outer side of the precision step shaft; the bottom end of the tailstock frame is provided with a tailstock frame folded edge extending to the right side, and a through hole is provided on the tailstock frame folded edge and is fixed to the machine bed of the CNC machine tool with bolts; the bottom end of the tailstock frame is provided with a bed precision positioning key through a bolt.

[0009] Preferably, the limiting positioning portion includes a front limiting downward movement positioning block near the front side and a rear limiting downward movement positioning block near the rear side, which are fixed by bolts on the top surface of the clamp main board; and a front limiting left movement block and a rear limiting left movement block on the left side, which are fixed by bolts on the outside of the front limiting downward movement positioning block and the rear limiting downward movement positioning block, and two limiting rear movement positioning blocks are arranged on the rear side.

[0010] Preferably, the front clamping part includes a front clamping cylinder arranged on the bottom surface of the clamp main board, the piston shaft of the front clamping cylinder passes through the clamp main board and is connected to a front clamping connecting rod, the top end of the front clamping connecting rod is hinged with a front clamping plate, and the middle of the front clamping plate is hinged with a vertical front hinge plate on the top surface of the clamp main board.

[0011] Preferably, the rear clamping part includes a rear clamping cylinder arranged on the bottom surface of the clamp main board, the piston shaft of the rear clamping cylinder passes through the clamp main board and is connected to a rear clamping connecting rod, the top end of the rear clamping connecting rod is hinged with a rear clamping plate, and the middle of the rear clamping plate is hinged with a vertical rear hinge plate on the top surface of the clamp main board.

[0012] Preferably, the side clamping portion comprises a side clamping cylinder arranged on the clamp main board, and the end of the piston shaft of the side clamping cylinder is connected to a wedge block through a connecting head.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model can realize the rapid loading and unloading operation of the fixture through the coordinated use of the positioning column and the tailstock, and can realize the rapid clamping operation of the workpiece through the coordinated use of the front clamping cylinder, the rear clamping cylinder and the side clamping cylinder, and the connecting flange of the positioning column can accurately locate the center height, and the protruding positioning key on the additional fourth axis flange can be used for precise angle positioning, and the cylinder and hinge mechanism are used to clamp the workpiece, and the characteristic of the cylinder to always maintain the clamping force is used to ensure that the clamping force of the workpiece is sufficient at any time point in the processing process; thereby ensuring that the utility model can clamp quickly, position reliably, and be stable during processing, and the processing cycle is within 60 seconds as tested by actual application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the axonometric drawing of the utility model;

[0016] Figure 2 It is a schematic diagram of the connecting flange;

[0017] Figure 3 It is a schematic diagram of clamping a workpiece on the fixture main board;

[0018] Figure 4 for Figure 1 Top view;

[0019] Figure 5 for Figure 4 Composite section view of AA and BB;

[0020] Figure 6 for Figure 4 Composite cross-sectional view of CC and DD;

[0021] Figure 7 It is an exploded schematic diagram of the workpiece and the limiting positioning part;

[0022] Figure 8 is a schematic diagram of the workpiece;

[0023] In the figure: connecting flange-1, flange plate-11, positioning column-12, fixing screw-13, positioning keyway-14, fixture mounting hole-15, fixture main board-2, rotation center positioning hole-21, tail end rotating shaft-3, precision step shaft-31, precision rotary bearing-32, tailstock frame-4, tailstock frame folding edge-41, bed surface precision positioning key-42, limiting positioning part-5, front limiting downward movement positioning block-51, rear limiting downward movement positioning block The positioning block -52, the front block for limiting left movement -53, the rear block for limiting left movement -54, the positioning block for limiting rear movement -55, the front clamping part -6, the front clamping cylinder -61, the front clamping connecting rod -62, the front clamping plate -63, the front hinge plate -64, the rear clamping part -7, the rear clamping cylinder -71, the clamping connecting rod -72, the rear clamping plate -73, the rear hinge plate -74, the side clamping part -8, the side clamping cylinder -81, the wedge-tightening block -82. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the technical solution in the embodiments of the present utility model is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Please refer to Figure 1-8 , Figure 1 This is the axonometric drawing of the utility model; Figure 2 It is a schematic diagram of the connecting flange; Figure 3 It is a schematic diagram of clamping a workpiece on the fixture main board; Figure 4 for Figure 1 Top view; Figure 5 for Figure 4 Composite section view of AA and BB; Figure 6 for Figure 4 Composite cross-sectional view of CC and DD; Figure 7 It is an exploded schematic diagram of the workpiece and the limiting positioning part; Figure 8 Schematic diagram of the workpiece.

[0026] The utility model provides a fixture of a CNC milling finishing buffer frame for a rotating additional axis, comprising a connecting flange 1 coaxially arranged on the fourth rotating axis of a CNC machine tool, a fixture main board 2 coinciding with its axis is arranged on the right side of the connecting flange 1, a tail end rotating shaft 3 is arranged at the center of the right end of the fixture main board 2 by bolts, the tail end rotating shaft 3 is connected to a tail stock frame 4 by a bearing, and the bottom end of the tail stock frame 4 is fixedly arranged on the machine bed of the CNC machine tool by bolts; a limiting positioning portion 5 is arranged at the center of the top surface of the fixture main board 2, and a front clamping portion 6 is arranged on the left side of the limiting positioning portion 5, a rear clamping portion 7 is arranged on the right side near the front side, and a side clamping portion 8 is arranged on the right side near the rear side.

[0027] The connecting flange 1 includes a flange 11, and a coaxial cylindrical positioning column 12 protruding to the left is arranged on the left side surface of the flange 11. The positioning column 12 cooperates with the precision positioning hole of the fourth axis flange to complete the height positioning with the machine tool bed surface; a plurality of fixing screws 13 are arranged on the same circumference of the left side surface of the flange 11 on the outside of the positioning column 12, which are used to fasten the fourth rotating axis of the CNC machine tool and ensure axial positioning; and a positioning keyway 14 is also provided to cooperate with the protruding key of the fourth axis flange to complete the circumferential positioning with the CNC fourth axis; in addition, two clamp mounting holes 15 are symmetrically arranged on the outside of the positioning column 12 with the axis of the flange 11 and are fixedly connected to the clamp main board 2 by two bolts.

[0028] The clamp main board 2 is rectangular in design, and its center line coincides with the axis line of the connecting flange 1, and it rotates synchronously with the connecting flange 1; a precise rotation center positioning hole 21 is set on the right side of the clamp main board 2, which cooperates with the precise stepped shaft on the tailstock 4 to eliminate the processing and assembly errors of the clamp main board 2 and the connecting flange 1, thereby ensuring that the parallelism of the clamp main board 2 and the bed surface is qualified.

[0029] The tail end rotating shaft 3 is coaxially arranged with the connecting flange 1, and includes a precision step shaft 31 arranged in the rotation center positioning hole 21 by bolts, a precision slewing bearing 32 is installed on the outer side of the precision step shaft 31 by interference fit, and a tailstock 4 is installed on the outer side of the precision slewing bearing 32 by interference fit, thereby ensuring smooth rotation of the fourth axis of the CNC machine tool during processing.

[0030] The tailstock frame 4 is provided with an inwardly concave circular groove near the top end, and is installed with an interference fit with the precision slewing bearing 32 on the outer side of the precision step shaft 31; the bottom end of the tailstock frame 4 is provided with a tailstock frame folding edge 41 extending to the right side, and a through hole is provided on the tailstock frame folding edge 41 and is fixed to the machine bed of the CNC machine tool with bolts; the bottom end of the tailstock frame 4 is provided with a bed precision positioning key 42 through bolts.

[0031] The limiting positioning portion 5 includes a front limiting downward movement positioning block 51 near the front side below the workpiece and a rear limiting downward movement positioning block 52 near the rear side, which are fixed by bolts on the top surface of the clamp main board 2; and a front limiting left movement block 53 and a rear limiting left movement block 54 on the outside of the workpiece, which are fixed by bolts on the top surface of the clamp main board 2, as well as two rear limiting rear movement positioning blocks 55 set on the rear side.

[0032] The front clamping part 6 includes a front clamping cylinder 61 arranged on the bottom surface of the clamp main board 2, the piston shaft of the front clamping cylinder 61 passes through the clamp main board 2 and is connected to a front clamping connecting rod 62, the top end of the front clamping connecting rod 62 is hinged with a front clamping plate 63, the middle of the front clamping plate 63 is hinged with a front hinge plate 64, and the front hinge plate 64 is vertically arranged on the top surface of the clamp main board 2.

[0033] The rear clamping part 7 includes a rear clamping cylinder 71 arranged on the bottom surface of the clamp main board 2, the piston shaft of the rear clamping cylinder 71 passes through the clamp main board 2 and is connected to a rear clamping connecting rod 72, the top end of the rear clamping connecting rod 72 is hinged with a rear clamping plate 73, the middle of the rear clamping plate 73 is hinged with a rear hinge plate 74, and the rear hinge plate 74 is vertically arranged on the top surface of the clamp main board 2.

[0034] The side clamping part 8 includes a side clamping cylinder 81 arranged on the clamp main board 2. The end of the piston shaft of the side clamping cylinder 81 is connected to a wedge block 82 through a connecting head. The wedge block 82 can be pressed against the workpiece to clamp the workpiece laterally.

[0035] When in use, the first step is to position the workpiece to be processed on the top surfaces of the front limiting downward movement positioning block 51 and the rear limiting downward movement positioning block 52, as well as between the front left movement limiting block 53, the rear left movement limiting block 54, and the two rear movement limiting positioning blocks 55; then, the solenoid valve is driven by the control system of the machine tool to pass compressed air into the rear air inlet holes of the three cylinders, so that the piston moves upward, driving the corresponding connecting rod and the clamping plate to clamp and fix the workpiece downward; at the same time, when the cylinder piston rises, the side clamping part 8 drives the wedge block 82 to move upward through the connecting head, and the rear side of the clamping head that is pushed by the inclined surface of the wedge block to squeeze the workpiece is subjected to force, and the clamping head extends forward, and the workpiece is squeezed on the front left movement limiting block 53, the rear left movement limiting block 54, and the two rear movement limiting positioning blocks 55;

[0036] In the second step, after the workpiece is clamped and fixed, the CNC machine tool is started to perform corresponding precision machining operations on the workpiece;

[0037] The third step is that after the CNC machine tool has completed the processing and the tool has been lifted to a safe height, the solenoid valve is driven by the machine tool control system to pass compressed air into the front air holes of the three cylinders to move the piston downward, wherein the front clamping cylinder and the rear clamping cylinder pistons move downward, and drive the heads of the front clamping connecting rod 62 and the front clamping plate 63 to be lifted, as well as the heads of the clamping connecting rod 72 and the rear clamping plate 73 to be lifted; at the same time, when the cylinder piston descends, the side clamping part 8 drives the wedge block 82 to move downward through the connecting head, and the force behind the clamping head that is pushed and squeezed by the inclined surface of the wedge block 82 to squeeze the workpiece disappears, and the workpiece is no longer squeezed, and the processed workpiece can be taken out of the positioning and removed from the fixture by hand;

[0038] Step 4: Repeat steps 1 to 3 to start processing the new workpiece.

[0039] During machining, since the fourth axis of the CNC machine tool has a servo motor and encoder and is uniformly controlled by the CNC system of the CNC machine tool, when a certain finishing part of the workpiece is to be machined, the CNC program is used to rotate the normal of the part to be parallel to the tool rotation axis. The CNC system controls the tool to move to the corresponding coordinate position, and accurate machining can be performed.

[0040] The utility model can realize the rapid loading and unloading operation of the fixture through the coordinated use of the positioning column and the tailstock, and can realize the rapid clamping operation of the workpiece through the coordinated use of the front clamping cylinder, the rear clamping cylinder and the side clamping cylinder, and the connecting flange of the positioning column can accurately locate the center height, and the protruding positioning key on the additional fourth axis flange can be used for precise angle positioning, and the cylinder and hinge mechanism are used to clamp the workpiece, and the characteristic of the cylinder to always maintain the clamping force is used to ensure that the clamping force of the workpiece is sufficient at any time point in the processing process; thereby ensuring that the utility model can clamp quickly, position reliably, and be stable during processing, and the processing cycle is within 60 seconds as tested by actual application.

[0041] Although the embodiments of the utility model have been shown and described, it is obvious that the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, it can be understood by ordinary technicians in this field that all other embodiments obtained by making various changes, modifications, substitutions and variations to these embodiments without departing from the principle and spirit of the utility model and without making creative work, all belong to the scope of protection of the utility model.

Claims

1. A fixture for CNC milling finishing buffer frame for rotating additional axis, characterized in that: The invention comprises a connecting flange (1) coaxially arranged on the fourth rotating axis of a numerically controlled machine tool, a fixture main board (2) coincident with the axis thereof is arranged on the right side of the connecting flange (1), a tail end rotating shaft (3) is arranged at the center of the right end of the fixture main board (2) by means of bolts, the tail end rotating shaft (3) is connected to a tail stock frame (4) by means of a bearing, and the bottom end of the tail stock frame (4) is fixedly arranged on the machine bed of the numerically controlled machine tool by means of bolts; a limiting positioning portion (5) is arranged at the center of the top surface of the fixture main board (2), a front clamping portion (6) is arranged on the left side of the limiting positioning portion (5), a rear clamping portion (7) is arranged on the right side near the front side, and a side clamping portion (8) is arranged on the right side near the rear side.

2. The fixture for the CNC milling finishing buffer frame for the rotary additional axis according to claim 1 is characterized in that: The connecting flange (1) comprises a flange (11), a cylindrical positioning column (12) which is coaxial and protrudes to the left is arranged on the left side surface of the flange (11), and a plurality of fixing screws (13) and a positioning keyway (14) which cooperates with the protruding key of the fourth axis flange are arranged on the outer side of the positioning column (12) on the same circumference of the left side surface of the flange (11); two clamp mounting holes (15) are symmetrically arranged on the outer side of the positioning column (12) with the axis of the flange (11) and are fixedly connected to the clamp main board (2) by two bolts.

3. The fixture for the CNC milling finishing buffer frame for the rotary additional axis according to claim 2 is characterized in that: The clamp main plate (2) is rectangular in shape, and its center line coincides with the axis line of the connecting flange (1). A precise rotation center positioning hole (21) is provided on the right side of the clamp main plate (2).

4. The fixture for the CNC milling finishing buffer frame for the rotary additional axis according to claim 3 is characterized in that: The tail end rotating shaft (3) is coaxially arranged with the connecting flange (1), and comprises a precision step shaft (31) arranged in the rotation center positioning hole (21) by means of bolts, a precision slewing bearing (32) is installed on the outer side of the precision step shaft (31) by means of interference fit, and a tail stock (4) is installed on the outer side of the precision slewing bearing (32) by means of interference fit.

5. The fixture for the CNC milling finishing buffer frame for the rotary additional axis according to claim 4 is characterized in that: The tailstock frame (4) is provided with an inwardly concave circular groove near the top end, and is installed in an interference fit with the precision slewing bearing (32) on the outside of the precision step shaft (31); the bottom end of the tailstock frame (4) is provided with a tailstock frame folding edge (41) extending to the right, and a through hole is provided on the tailstock frame folding edge (41) and is fixed to the machine bed of the CNC machine tool by bolts; the bottom end of the tailstock frame (4) is provided with a bed surface precision positioning key (42) by bolts.

6. The fixture for the CNC milling finishing buffer frame for the rotary additional axis according to claim 5 is characterized in that: The limiting positioning portion (5) comprises a front limiting downward movement positioning block (51) close to the front side and a rear limiting downward movement positioning block (52) close to the rear side, which are fixed by bolts on the top surface of the clamp main board (2); and a left limiting left movement front block (53) and a left limiting left movement rear block (54) fixed by bolts are arranged on the outside of the front limiting downward movement positioning block (51) and the rear limiting downward movement positioning block (52) on the top surface of the clamp main board (2), as well as two rear limiting rear movement positioning blocks (55) arranged on the rear side.

7. The fixture for the CNC milling finishing buffer frame for the rotary additional axis according to claim 6 is characterized in that: The front clamping part (6) includes a front clamping cylinder (61) arranged on the bottom surface of the clamp main board (2), the piston shaft of the front clamping cylinder (61) passes through the clamp main board (2) and is connected to a front clamping connecting rod (62), the top end of the front clamping connecting rod (62) is hinged with a front clamping plate (63), and the middle of the front clamping plate (63) is hinged with a front hinge plate (64) vertically disposed on the top surface of the clamp main board (2).

8. The fixture for the CNC milling finishing buffer frame for the rotary additional axis according to claim 7 is characterized in that: The rear clamping part (7) includes a rear clamping cylinder (71) arranged on the bottom surface of the clamp main board (2), the piston shaft of the rear clamping cylinder (71) passes through the clamp main board (2) and is connected to a rear clamping connecting rod (72), the top end of the rear clamping connecting rod (72) is hinged with a rear clamping plate (73), and the middle of the rear clamping plate (73) is hinged with a rear hinge plate (74) vertically disposed on the top surface of the clamp main board (2).

9. The fixture for the CNC milling finishing buffer frame for the rotary additional axis according to claim 8 is characterized in that: The side clamping part (8) comprises a side clamping cylinder (81) arranged on the clamp main plate (2), and the end of the piston shaft of the side clamping cylinder (81) is connected to a wedge block (82) via a connecting head.

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