A rotatable clamping system for increasing the number of rotary shafts of a worktable of a four-axis machining center

Abstract

The application discloses a kind of increase four-axis machining center workbench rotary axle number's indexable clamping system, including four-axis machining center rotary index plate, double workpiece holder is installed on four-axis machining center rotary index plate;Double workpiece holder includes first support plate and second support plate;First support plate and second support plate vertical fixed connection, the outside of first support plate is detachably fixed clamped with first workpiece by clamping structure, the outside of second support plate is detachably fixed clamped with second workpiece by clamping structure, first workpiece and second workpiece are the same structure workpiece;The application controls tool rotation angle by four-axis index plate, cooperates the rotation index function of tool, can realize the conversion of tool rotation axis on workbench, on four-axis machining center can be completed all four feed normal plane all processing content in a process by once clamping.

Description

Technical Field

[0001] This invention belongs to the field of machining centers. Background Technology

[0002] In addition to the X, Y, and Z axes, a four-axis machining center has an A, B, or C axis that rotates around any one of the three axes, unlike a conventional machining center. Similarly, a five-axis machining center has two more rotary axes than a conventional machining center. These rotary axes enable the worktable to rotate, allowing the machining of more process surfaces or holes with different feed directions to be completed in the same operation, reducing the number of clamping operations and improving machining accuracy and production efficiency.

[0003] by Figure 3 Taking a part as an example, the surfaces and holes to be machined can be divided into four different feed normal planes according to the axial feed direction of the machining center's Z-axis. Following a conventional process route, the machining operations on the second, third, and fourth feed normal planes can be arranged on a four-axis machining center, with the fixture rotating around the normal axis of the first feed normal plane, completing the machining in one operation. However, the machining of the two holes in the first feed normal plane requires a separate operation. If it is desired to complete the machining in a single setup within the same operation, only a five-axis machining center can achieve this. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides an indexable clamping system that increases the number of rotation axes of a four-axis machining center worktable. The present invention controls the rotation angle of the tooling through a four-axis indexing plate and, in conjunction with the tooling rotation and repositioning function, enables the conversion of the rotation axis of the tooling on the worktable. On a four-axis machining center, all machining contents on all four feed normal surfaces can be completed in one operation with a single clamping.

[0005] Technical solution: To achieve the above objectives, the present invention provides a indexable clamping system for increasing the number of rotation axes of a four-axis machining center worktable, including a four-axis machining center rotary indexing plate, on which a double workpiece clamp is mounted.

[0006] The dual-workpiece clamping device includes a first support plate and a second support plate; the first support plate and the second support plate are vertically fixedly connected, and the first workpiece is detachably and fixedly clamped on the outer side of the first support plate through a clamping structure, and the second workpiece is detachably and fixedly clamped on the outer side of the second support plate through a clamping structure. The first workpiece and the second workpiece are workpieces with the same structure.

[0007] There exists a virtual axis that intersects perpendicularly with the axis of the rotary indexing plate of the four-axis machining center. The first support plate and the second support plate can rotate and adjust around the virtual axis. The dual workpiece clamping device includes state A and state B. Based on state A, the first support plate and the second support plate rotate 90° around the virtual axis and then enter state B.

[0008] Furthermore, the dual workpiece clamp also includes a rotary support plate, which is fixedly mounted on the rotary indexing plate of the four-axis machining center; a structural plate is vertically fixedly mounted on one side of the rotary support plate.

[0009] The dual workpiece clamp also includes at least two parallel hinge plates, the surfaces of which are perpendicular to both the first and second support plates; the hinge plates are fixedly installed in the vertical angle between the first and second support plates; the hinge plates are parallel to the structural plate; a virtual axis passes perpendicularly through the hinge plates, and the hinge plates can be adjusted by rotating around the virtual axis.

[0010] Furthermore, a hinge support shaft is rotatably mounted in the bearing hole of the hinge plate, and the axis of the hinge support shaft coincides with the virtual axis.

[0011] Furthermore, a stepped hole is provided through the structural plate, and the threaded end of the hinged support shaft (a) passes through the stepped hole, with the shoulder at the root of the threaded end (a) axially positioned and fitted with the stepped hole; and a locking nut is provided to lock the threaded end (a) of the hinged support shaft.

[0012] Furthermore, the inner sides of the first support plate, the second support plate, and the slewing bearing plate at the ends away from the structural plate are respectively provided with a first slot, a second slot, and a third slot;

[0013] It also includes a locking beam, which is located on the side of the two hinge plates away from the structural plate and is parallel to the hinge plates;

[0014] In state A: the two ends of the locking beam are respectively engaged in the first and third slots;

[0015] In state B: The two ends of the locking beam are respectively engaged in the second and third slots.

[0016] Furthermore, a through hole is vertically passed through the locking beam, and the threaded end of the hinge support shaft (b) passes through the through hole. The threaded end of the hinge support shaft (b) is locked with a locking nut (b). A compression-shaped push spring is sleeved on the hinge support shaft on the side of the locking beam away from the locking nut (b). The compression-shaped push spring exerts a pushing force on the locking beam.

[0017] Furthermore, the bearing holes on each hinge plate are rotated and axially positioned with the shoulder of the hinge support shaft via angular contact ball bearings; one end of the bearing hole is coaxially connected to a bearing sealing end cap via a flange.

[0018] Furthermore, a method for operating a indexable clamping system that increases the number of rotary axes on a four-axis machining center's worktable:

[0019] The device is initially in state A. In state A, the two ends of the locking beam are respectively engaged in the first and third slots, and the locking nut is fully locked. The first workpiece is fixedly clamped on the outer side of the first support plate by the clamping structure, and the second workpiece is fixedly clamped on the outer side of the second support plate by the clamping structure. The clamping process is now complete.

[0020] Then, the machine tool is turned on. The normal axis of the first feed normal surface of the first workpiece clamped on the first support plate rotates coaxially with the four-axis indexing plate. At this time, the machining content on the second, third, and fourth feed normal surfaces of the first workpiece clamped on the first support plate is completed. At the same time, the first feed normal surface of the second workpiece clamped on the second support plate is parallel to the rotation axis of the four-axis indexing plate and rotates around it, completing the machining content on the first feed normal surface of the second workpiece on the second support plate.

[0021] Then pause the program, loosen the b locking nut, and under the action of the compressed push spring, the two ends of the locking beam will disengage from the first and third slots respectively. Then, use a robot or your hand to rotate the first and second support plates 90° around the virtual axis to enter state B. Subsequently, make the two ends of the locking beam lock into the second and third slots respectively, and then tighten the b locking nut again.

[0022] When the machine tool is restarted, the normal axis of the first feed normal surface of the second workpiece clamped on the second support plate rotates coaxially with the four-axis indexing plate. At this time, the machining of the second, third, and fourth feed normal surfaces of the second workpiece clamped on the second support plate is completed. At the same time, the first feed normal surface of the first workpiece clamped on the first support plate is parallel to the rotation axis of the four-axis indexing plate and rotates around it. At this time, the machining of the first feed normal surface of the first workpiece clamped on the first support plate is completed.

[0023] Beneficial effects: This invention controls the rotation angle of the tooling through a four-axis indexing plate. Combined with the tooling's rotational repositioning function, it enables the conversion of the tooling's rotational axis on the worktable. On a four-axis machining center, all machining operations on the four feed normal planes can be completed in a single setup and one operation, reducing the number of setups, improving part machining accuracy, and allowing machining tasks that would normally require multiple operations on a conventional machining center or a single operation on a five-axis machining center to be completed in a single operation on a four-axis machining center. This significantly saves production resources, reduces processing costs, and improves production efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram showing two states of this device;

[0025] Figure 2 for Figure 1 AA section view;

[0026] Figure 3 A schematic diagram of multiple feed normal planes for the workpiece;

[0027] Figure 4 This is a schematic diagram of the connection structure of the first support plate, the second support plate, and the hinge plate. Detailed Implementation

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] As attached Figures 1 to 4 The illustrated indexable clamping system for increasing the number of rotary axes of a four-axis machining center table includes a four-axis machining center rotary indexing plate 9, on which a double workpiece clamping device 25 is mounted.

[0030] The dual-workpiece clamping device 25 includes a first support plate 1a and a second support plate 1b; the first support plate 1a and the second support plate 1b are vertically fixedly connected, and a first workpiece 3a is detachably and fixedly clamped on the outer side of the first support plate 1a through a clamping structure 4, and a second workpiece 3b is detachably and fixedly clamped on the outer side of the second support plate 1b through a clamping structure 4. The first workpiece 3a and the second workpiece 3b are workpieces with the same structure; the workpieces are as follows: Figure 3 The surface to be machined and the holes shown can be divided into four different feed normal planes according to the axial feed direction of the Z-axis of the machining center. According to conventional process routes, the machining on the second, third, and fourth feed normal planes can be arranged on a four-axis machining center, with the fixture rotating around the normal axis of the first feed normal plane, and completed in one operation. However, the machining of the two holes in the first feed normal plane requires a separate operation. This solution effectively solves this problem, allowing all machining on the four feed normal planes to be completed in one operation with a single setup on a four-axis machining center, reducing the number of setups and improving the machining accuracy of the parts. The specific solution is as follows:

[0031] There exists a virtual axis that is perpendicular to the axis of the rotary indexing plate 9 of the four-axis machining center. The first support plate 1a and the second support plate 1b can be rotated and adjusted around the virtual axis. The double workpiece clamping device 25 includes state A and state B. Based on state A, the first support plate 1a and the second support plate 1b rotate 90° around the virtual axis and then enter state B.

[0032] The dual workpiece clamp 25 also includes a rotary support plate 7, which is fixedly locked onto the rotary indexing plate 9 of the four-axis machining center by locking components. This allows the rotary support plate 7 to rotate synchronously with the rotary indexing plate 9 of the four-axis machining center. During use, the precision positioning structure ensures that the indexing rotation axis of the dual workpiece clamp 25 is concentric with the A-axis of the machine tool.

[0033] In this case, a structural plate 12 is vertically fixed to one side of the slewing bearing plate 7.

[0034] The dual workpiece clamp 25 also includes at least two parallel hinge plates 5, the surface of which is perpendicular to both the first support plate 1a and the second support plate 1b; and the hinge plates 5 are fixedly installed in the vertical angle between the first support plate 1a and the second support plate 1b; and the hinge plates 5 are parallel to the structural plate 12; the virtual axis passes perpendicularly through the hinge plates 5, and the hinge plates 5 can be adjusted by rotating around the virtual axis.

[0035] A hinge support shaft 10 is rotatably mounted in the bearing hole 20 on the hinge plate 5, and the axis of the hinge support shaft 10 coincides with the virtual axis.

[0036] A stepped hole 31 is provided through the structural plate 12. The threaded end of the hinged support shaft 10 passes through the stepped hole 31, and the shoulder at the root of the threaded end is axially positioned and engaged with the stepped hole 31. A locking nut 32 is provided to lock the threaded end of the hinged support shaft 10.

[0037] The inner sides of the first support plate 1a, the second support plate 1b and the rotary support plate 7 at the end away from the structural plate 12 are respectively provided with a first slot 2a, a second slot 2b and a third slot 8;

[0038] It also includes a locking beam 6, which is located on the side of the two hinge plates 5 away from the structural plate 12, and the locking beam 6 is parallel to the hinge plates 5.

[0039] In state A: the two ends of the locking beam 6 are respectively engaged in the first slot 2a and the third slot 8;

[0040] In state B: The two ends of the locking beam 6 are respectively engaged in the second slot 2b and the third slot 8.

[0041] A vertical through hole 33 is provided on the locking beam 6. The threaded end of the hinge support shaft 10 passes through the through hole 33 and is locked with a locking nut 11. A compression-shaped push spring 13 is sleeved on the hinge support shaft 10 on the side of the locking beam 6 away from the locking nut 11. The compression-shaped push spring 13 exerts a pushing force on the locking beam 6.

[0042] Each bearing hole 20 on the hinge plate 5 is rotated and axially positioned with the shoulder of the hinge support shaft 10 through an angular contact ball bearing 16; one end of the bearing hole 20 is coaxially connected to a bearing sealing end cover 15 through a flange.

[0043] Working principle:

[0044] In the initial state of this device, it is in state A. In state A, the two ends of the locking beam 6 are respectively engaged in the first slot 2a and the third slot 8, and the locking nut 11 is fully locked. The first workpiece 3a is fixedly clamped on the outer side of the first support plate 1a through the clamping structure 4, and the second workpiece 3b is fixedly clamped on the outer side of the second support plate 1b through the clamping structure 4. The clamping process is now complete.

[0045] Then, the machine tool is turned on. The normal axis of the first feed normal surface of the first workpiece 3a clamped on the first support plate 1a rotates coaxially with the four-axis indexing plate. At this time, the machining content on the second, third, and fourth feed normal surfaces of the first workpiece 3a clamped on the first support plate 1a is completed. At the same time, the first feed normal surface of the second workpiece 3b clamped on the second support plate 1b is parallel to the rotation axis of the four-axis indexing plate and rotates around it. At this time, the machining content on the first feed normal surface of the second workpiece 3b on the second support plate 1b is completed.

[0046] Then pause the program, loosen the b locking nut 11, and under the elastic force of the compressed push spring 13, the two ends of the locking beam 6 disengage from the first slot 2a and the third slot 8 respectively. Then, use a robot or your hand to rotate the first support plate 1a and the second support plate 1b 90° around the virtual axis to enter state B. Then, make the two ends of the locking beam 6 lock in the second slot 2b and the third slot 8 respectively, and then tighten the b locking nut 11 again.

[0047] When the machine tool is restarted, the normal axis of the first feed normal surface of the second workpiece 3b clamped on the second support plate 1b rotates coaxially with the four-axis indexing plate. At this time, the machining of the second, third, and fourth feed normal surfaces of the second workpiece 3b clamped on the second support plate 1b is completed. At the same time, the first feed normal surface of the first workpiece 3a clamped on the first support plate 1a is parallel to the rotation axis of the four-axis indexing plate and rotates around it. At this time, the machining of the first feed normal surface of the first workpiece 3a clamped on the first support plate 1a is completed.

[0048] Thus, by controlling the rotation angle of the tooling through the four-axis indexing plate and coordinating with the tooling's rotation and repositioning function, the tooling's rotation axis can be changed. In one process, all the machining contents on two workpieces are completed sequentially through one positioning and clamping, reducing the number of clamping operations and improving the machining accuracy of the parts. The machining contents that can only be completed by a five-axis machining center are completed in a four-axis machining center, which greatly saves production resources and reduces production costs.

[0049] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A indexable clamping system for increasing the number of rotational axes of a worktable of a four-axis machining center, characterized in that: Including four axis machining center rotation index plate (9), the double workpiece holder (25) is installed on the four axis machining center rotation index plate (9); The double workpiece holder (25) includes a first supporting plate (1a) and a second supporting plate (1b);The first supporting plate (1a) and the second supporting plate (1b) are fixedly connected vertically, and the outer side of the first supporting plate (1a) is detachably fixed with a first workpiece (3a) through a clamping structure (4), and the outer side of the second supporting plate (1b) is detachably fixed with a second workpiece (3b) through the clamping structure (4); There is a virtual axis perpendicular to the axis of the four-axis machining center rotation index plate (9), and the first supporting plate (1a) and the second supporting plate (1b) can rotate and adjust around the virtual axis, and the double workpiece holder (25) includes A state and B state;On the basis of the A state, the first supporting plate (1a) and the second supporting plate (1b) are rotated by 90° around the virtual axis and enter the B state; The double workpiece holder (25) further comprises a slewing base plate (7), and the slewing base plate (7) is fixedly installed on the four-axis machining center rotation index plate (9);One side of the slewing base plate (7) is fixedly installed with a structure plate (12) vertically; The double workpiece holder (25) further comprises at least two parallel hinged plates (5), the plane of the hinged plate (5) is perpendicular to the first supporting plate (1a) and the second supporting plate (1b);And the hinged plate (5) is fixedly installed in the vertical included angle between the first supporting plate (1a) and the second supporting plate (1b);And the hinged plate (5) is parallel to the structure plate (12);The virtual axis vertically penetrates the hinged plate (5), and the hinged plate (5) rotates and adjusts around the virtual axis; The bearing hole (20) on the hinged plate (5) is rotatably installed with a hinged supporting shaft (10), and the axis of the hinged supporting shaft (10) coincides with the virtual axis; A stepped hole (31) is provided through the structure plate (12), the a threaded end of the hinged supporting shaft (10) penetrates out of the stepped hole (31), and the shaft shoulder at the root of the a threaded end is in axial positioning fit with the stepped hole (31);And the a threaded end of the hinged supporting shaft (10) is locked with an a locking nut (32); The inner side of the end of the first supporting plate (1a), the second supporting plate (1b) and the slewing base plate (7) away from the structure plate (12) is respectively provided with a first clamping groove (2a), a second clamping groove (2b) and a third clamping groove (8); It also includes a locking beam (6), and the locking beam (6) is located on the side of the two hinged plates (5) away from the structure plate (12), and the locking beam (6) is parallel to the hinged plate (5); In the A state: the two ends of the locking beam (6) are respectively clamped in the first clamping groove (2a) and the third clamping groove (8); In the B state: the two ends of the locking beam (6) are respectively clamped in the second clamping groove (2b) and the third clamping groove (8).

2. The indexable clamping system for increasing the number of rotary axes of the worktable of a four-axis machining center according to claim 1, characterized in that: The locking beam (6) is vertically penetrated by an axle through hole (33), the b threaded end of the articulated support axle (10) is penetrated out of the axle through hole (33), and the b threaded end of the articulated support axle (10) is locked by a b locking nut (11); the articulated support axle (10) outside the b locking nut (11) side of the locking beam (6) is sleeved by a compressed push spring (13), and the compressed push spring (13) forms a pushing force on the locking beam (6).

3. The indexable clamping system of claim 2, wherein: The bearing hole (20) on each articulated plate (5) is rotatably and axially positioned by an angular contact ball bearing (16) at the shaft shoulder of the articulated support axle (10); the bearing hole (20) is coaxially connected with a bearing sealing end cover (15) at one end through a flange.

4. The working method of the indexable clamping system of claim 3, wherein: The initial state of the device is A state, in which the two ends of the locking beam (6) are clamped in the first clamping groove (2a) and the third clamping groove (8) respectively, and the b locking nut (11) is completely locked; the outer side of the first support plate (1a) is fixedly clamped with the first workpiece (3a) through the clamping structure (4), and the outer side of the second support plate (1b) is fixedly clamped with the second workpiece (3b) through the clamping structure (4); thus the clamping process is completed; Then start the machine tool, the normal axis of the first feed normal surface of the first workpiece (3a) clamped on the first support plate (1a) is coaxially rotated with the four-axis indexing disc, at this time, the machining contents on the second, third and fourth feed normal surfaces of the first workpiece (3a) clamped on the first support plate (1a); at the same time, the first feed normal surface of the second workpiece (3b) clamped on the second support plate (1b) is parallel to the four-axis indexing disc rotation axis and rotates around it, completing the machining contents on the first feed normal surface of the second workpiece (3b) on the second support plate (1b); Then pause the program, loosen the b locking nut (11), under the elastic force of the compressed push spring (13), the two ends of the locking beam (6) are respectively separated from the first clamping groove (2a) and the third clamping groove (8), then use the robot hand or use the hand to pull the first support plate (1a) and the second support plate (1b) to rotate 90° around the virtual axis and enter the B state, then make the two ends of the locking beam (6) clamped in the second clamping groove (2b) and the third clamping groove (8), and then tighten the b locking nut (11) again; Then start the machine tool again, at this time, the normal axis of the first feed normal surface of the second workpiece (3b) clamped on the second support plate (1b) is coaxially rotated with the four-axis indexing disc, at this time, complete the machining contents on the second, third and fourth feed normal surfaces of the second workpiece (3b) clamped on the second support plate (1b); at the same time, the first feed normal surface of the first workpiece (3a) clamped on the first support plate (1a) is parallel to the four-axis indexing disc rotation axis and rotates around it, at this time, complete the machining contents on the first feed normal surface of the first workpiece (3a) clamped on the first support plate (1a).

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