Indexable clamping system capable of increasing number of rotating shafts of working table of four-axis machining center

Abstract

The invention discloses an indexable clamping system capable of increasing the number of rotating shafts of a workbench of a four-axis machining center. The indexable clamping system comprises a four-axis machining center rotating index plate, and a double-workpiece clamping device is installed on the four-axis machining center rotating index plate; the double-workpiece clamping device comprises a first supporting plate and a second supporting plate; the first supporting plate and the second supporting plate are vertically and fixedly connected, a first workpiece is detachably and fixedly clamped on the outer side of the first supporting plate through a clamping structure, a second workpiece is detachably and fixedly clamped on the outer side of the second supporting plate through a clamping structure, and the first workpiece and the second workpiece are workpieces of the same structure; the rotating angle of the tool is controlled through the four-axis index plate, the rotating shaft of the tool on the workbench can be converted in cooperation with the rotating transposition function of the tool, and all machining contents on four feeding normal faces can be completed in one procedure through one-time clamping on a four-axis machining center.

Description

Technical Field

[0001] The invention belongs to the field of machining centers. Background Art

[0002] In addition to the three axes of X, Y, and Z, the four-axis machining center has an additional A, B, or C axis that can rotate around any of the three axes compared to ordinary machining centers; by analogy, the five-axis machining center has two more rotating axes than ordinary machining centers; these rotating axes enable the worktable to rotate, and more process structure surfaces or holes with different feed directions can be processed in the same process, reducing the number of clamping times and improving machining accuracy and production efficiency;

[0003] by Figure 3 Take a part as an example. The process structure surfaces and holes to be processed on it 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 the conventional process route, the processing content on the second, third, and fourth feed normal planes can be arranged on a four-axis machining center. The tooling uses the normal axis of the first feed normal plane as the rotary axis and is completed in one process. The processing of the two holes in the first feed normal plane requires another process. If you want to complete the processing in the same process through one clamping, you can only use a five-axis machining center to achieve this. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an indexable clamping system for increasing the number of rotary axes of the worktable of a four-axis machining center. The present invention controls the rotation angle of the tooling by a four-axis dividing plate, and cooperates with the rotation and transposition function of the tooling to realize the conversion of the rotary axes of the tooling on the worktable. On the four-axis machining center, all processing contents on all four feed normal surfaces can be completed in one process through one clamping.

[0005] Technical solution: To achieve the above-mentioned purpose, the present invention provides an indexable clamping system for increasing the number of rotary axes of a four-axis machining center worktable, comprising a rotary indexing plate of a four-axis machining center, on which a double workpiece clamp is installed;

[0006] The double workpiece clamp comprises a first support plate and a second support plate; the first support plate and the second support plate are vertically fixedly connected, the first support plate is detachably fixedly clamped with a first workpiece on the outer side through a clamping structure, and the second support plate is detachably fixedly clamped with a second workpiece on the outer side through a clamping structure, and the first workpiece and the second workpiece are workpieces with the same structure;

[0007] There is a virtual axis that intersects perpendicularly with the axis of the rotating indexing plate of the four-axis machining center. The first support plate and the second support plate can be rotated and adjusted around the virtual axis. The double workpiece clamp 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 double workpiece clamp also includes a swivel 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 swivel support plate;

[0009] The double workpiece clamp also includes at least two parallel hinged plates, the surfaces of the hinged plates are perpendicular to both the first support plate and the second support plate; the hinged plates are fixedly installed in the vertical angle between the first support plate and the second support plate; the hinged plates are parallel to the structural plate; the virtual axis passes vertically through the hinged plates, and the hinged plates are rotated and adjusted around the virtual axis.

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

[0011] Furthermore, a step hole is provided through the structural plate, the a-threaded end of the hinged support shaft passes through the step hole, and the shoulder at the root of the a-threaded end is axially positioned with the step hole; and a locking nut is provided for locking the a-threaded end of the hinged support shaft.

[0012] Furthermore, the first support plate, the second support plate and the swivel support plate are respectively provided with a first card slot, a second card slot and a third card slot on the inner side of one end away from the structural plate;

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

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

[0015] In state B: both ends of the locking beam are respectively clamped in the second clamping groove and the third clamping groove.

[0016] Furthermore, an axial through hole is vertically passed through the locking beam, and the b threaded end of the hinged supporting shaft passes through the axial through hole, and the b threaded end of the hinged supporting shaft is locked with a b locking nut; a compressed push-up spring is provided on the outer sleeve of the hinged supporting shaft on the side of the locking beam away from the b locking nut, and the compressed push-up spring exerts a pushing force on the locking beam.

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

[0018] Further, a working method of an indexable clamping system for increasing the number of rotary axes of a four-axis machining center worktable:

[0019] The initial state of the device is state A. In state A, the two ends of the locking beam are respectively clamped in the first clamping slot and the third clamping slot, and the b locking nut is completely locked; the first workpiece is fixedly clamped on the outer side of the first supporting plate through the clamping structure, and the second workpiece is fixedly clamped on the outer side of the second supporting plate through the clamping structure; the clamping process is now completed;

[0020] Then the machine tool is turned on, and the normal axis of the first feed normal surface of the first workpiece clamped on the first supporting plate rotates coaxially with the four-axis indexing plate, and at this time, the processing content on the second, third, and fourth feed normal surfaces of the first workpiece clamped on the first supporting plate is completed; at the same time, the first feed normal surface of the second workpiece clamped on the second supporting plate is parallel to the rotary axis of the four-axis indexing plate and rotates around it, and the processing content on the first feed normal surface of the second workpiece on the second supporting plate is completed;

[0021] Then pause the program, loosen the b locking nut, and under the action of the compressed push spring force, the two ends of the locking beam are disengaged from the first slot and the third slot respectively, and then use a robot arm or hand to turn the first support plate and the second support plate around the virtual axis 90° to enter the B state, then make the two ends of the locking beam respectively stuck in the second slot and the third slot, and then re-tighten the b locking nut.

[0022] Turn on the machine tool again. At this time, the normal axis of the first feed normal surface of the second workpiece clamped on the second supporting plate rotates coaxially with the four-axis dividing plate. At this time, the processing content on the second, third and fourth feed normal surfaces of the second workpiece clamped on the second supporting plate is completed; at the same time, the first feed normal surface of the first workpiece clamped on the first supporting plate is parallel to the rotating axis of the four-axis dividing plate and rotates around it. At this time, the processing content on the first feed normal surface of the first workpiece clamped on the first supporting plate is completed.

[0023] Beneficial effects: The present invention controls the tooling rotation angle through a four-axis indexing plate, and cooperates with the tooling's rotation transposition function to realize the conversion of the tooling's rotation axis on the workbench. On a four-axis machining center, all processing contents on all four feed normal surfaces can be completed in one process through one clamping, reducing the number of clamping times and improving the machining accuracy of parts, so that the machining tasks that originally needed to be completed in multiple processes on an ordinary machining center or completed in one process on a five-axis machining center can be completed in one process on a four-axis machining center. This greatly saves production resources, reduces machining costs, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0026] Figure 3 It is a schematic diagram of multiple feed normal surfaces of the workpiece;

[0027] Figure 4 It is a schematic diagram of the connection structure of the first supporting plate, the second supporting plate and the hinged plate. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with 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 worktable comprises a rotary indexing plate 9 of the four-axis machining center, on which a double workpiece clamp 25 is mounted;

[0030] The double workpiece clamp 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, the outer side of the first support plate 1a is detachably fixedly clamped with a first workpiece 3a through a clamping structure 4, and the outer side of the second support plate 1b is detachably fixedly clamped with a second workpiece 3b through a clamping structure 4, and the first workpiece 3a and the second workpiece 3b are workpieces with the same structure; the workpieces are as follows Figure 3 As shown, the process structure surfaces and holes to be processed 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 the conventional process route, the processing content on the second, third and fourth feed normal planes can be arranged on the four-axis machining center, and the tooling uses the normal axis of the first feed normal plane as the rotary axis to complete it in one process; while the processing of the two holes in the first feed normal plane requires another process to complete. This solution can solve this problem well. On the four-axis machining center, all processing content on all four feed normal planes can be completed in one process through one clamping, which reduces the number of clamping times and improves the processing accuracy of parts. The specific solution is as follows:

[0031] There is a virtual axis that intersects perpendicularly with the axis of the rotating 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 clamp 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 double workpiece clamp 25 also includes a swivel support plate 7, which is fixed and locked on the rotating indexing plate 9 of the four-axis machining center by a locking member; thereby, the swivel support plate 7 rotates synchronously with the rotating indexing plate 9 of the four-axis machining center. During use, the precise positioning structure is used to ensure that the indexing rotation axis of the double workpiece clamp 25 is concentric with the A-axis of the machine tool.

[0033] A structural plate 12 is vertically fixedly installed on one side of the swivel support plate 7 of the present invention.

[0034] The double workpiece clamp 25 also includes at least two parallel hinged plates 5, the surfaces of the hinged plates 5 are perpendicular to both the first support plate 1a and the second support plate 1b; the hinged plates 5 are fixedly installed in the vertical angle between the first support plate 1a and the second support plate 1b; the hinged plates 5 are parallel to the structural plate 12; the virtual axis passes vertically through the hinged plates 5, and the hinged plates 5 are rotated and adjusted around the virtual axis.

[0035] The 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 step hole 31 is provided through the structural plate 12, and the a-threaded end of the hinged support shaft 10 passes through the step hole 31, and the shoulder at the root of the a-threaded end is axially positioned with the step hole 31; and the a-threaded end of the hinged support shaft 10 is locked with a locking nut 32.

[0037] The first support plate 1a, the second support plate 1b and the inner side of the end of the swivel support plate 7 away from the structural plate 12 are respectively provided with a first clamping groove 2a, a second clamping groove 2b and a third clamping groove 8;

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

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

[0040] In state B: both ends of the locking beam 6 are respectively clamped in the second clamping groove 2 b and the third clamping groove 8 .

[0041] An axial through hole 33 is vertically passed through the locking beam 6, and the b threaded end of the hinged support shaft 10 passes through the axial through hole 33, and the b threaded end of the hinged support shaft 10 is locked with a b locking nut 11; the hinged support shaft 10 on the side of the locking beam 6 away from the b locking nut 11 is covered with a compressed push spring 13, and the compressed push spring 13 forms a pushing force on the locking beam 6.

[0042] The bearing holes 20 on each hinge plate 5 are rotationally 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] The initial state of the device is state A. In state A, the two ends of the locking beam 6 are respectively clamped in the first clamping groove 2a and the third clamping groove 8, and the b locking nut 11 is completely locked; the outer side of the first supporting plate 1a is fixedly clamped with the first workpiece 3a through the clamping structure 4, and the outer side of the second supporting plate 1b is fixedly clamped with the second workpiece 3b through the clamping structure 4; the clamping process is now completed;

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

[0046] After that, the program is paused, and the b locking nut 11 is loosened. Under the action of the elastic force of the compressed push spring 13, the two ends of the locking beam 6 are respectively disengaged from the first slot 2a and the third slot 8. Then, the first support plate 1a and the second support plate 1b are rotated 90° around the virtual axis by a robot or by hand to enter the B state. Subsequently, the two ends of the locking beam 6 are respectively stuck in the second slot 2b and the third slot 8, and then the b locking nut 11 is retightened.

[0047] Turn on 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 supporting plate 1b rotates coaxially with the four-axis dividing plate. At this time, the processing content on the second, third and fourth feed normal surfaces of the second workpiece 3b clamped on the second supporting plate 1b is completed; at the same time, the first feed normal surface of the first workpiece 3a clamped on the first supporting plate 1a is parallel to the rotating axis of the four-axis dividing plate and rotates around it. At this time, the processing content on the first feed normal surface of the first workpiece 3a clamped on the first supporting plate 1a is completed.

[0048] At this point, the rotation angle of the tooling is controlled by the four-axis dividing plate, and the rotation and transposition function of the tooling is used to realize the conversion of the tooling rotation axis. Within one process, all the processing content on the two parts to be processed is completed in sequence through one positioning and clamping, which reduces the number of clamping times and improves the processing accuracy of parts. The processing content that can only be completed by the five-axis machining center is completed on the four-axis machining center, which greatly saves production resources and reduces production costs.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An indexable clamping system for increasing the number of rotary axes of a four-axis machining center worktable, characterized in that: It comprises a four-axis machining center rotary indexing plate (9), on which a double workpiece clamp (25) is installed; The double workpiece clamp (25) comprises 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, the first support plate (1a) is detachably fixedly clamped with a first workpiece (3a) on its outer side via a clamping structure (4), and the second support plate (1b) is detachably fixedly clamped with a second workpiece (3b) on its outer side via a clamping structure (4); There is a virtual axis that intersects perpendicularly with the axis of the rotating 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 clamp (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 to enter state B.

2. The indexable clamping system for increasing the number of rotary axes of a four-axis machining center worktable according to claim 1, characterized in that: The double workpiece clamp (25) further comprises a rotary support plate (7), wherein the rotary support plate (7) is fixedly mounted on a rotary indexing plate (9) of a four-axis machining center; a structural plate (12) is vertically fixedly mounted on one side of the rotary support plate (7); The double workpiece clamp (25) also includes at least two parallel hinged plates (5), the surfaces of the hinged plates (5) being perpendicular to both the first support plate (1a) and the second support plate (1b); the hinged plates (5) being fixedly installed in the vertical angle between the first support plate (1a) and the second support plate (1b); the hinged plates (5) being parallel to the structural plate (12); the virtual axis passing vertically through the hinged plates (5), and the hinged plates (5) being rotatably adjusted around the virtual axis.

3. The indexable clamping system for increasing the number of rotary axes of a four-axis machining center worktable according to claim 2, characterized in that: 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.

4. The indexable clamping system for increasing the number of rotary axes of a four-axis machining center worktable according to claim 3, characterized in that: The structural plate (12) is provided with a stepped hole (31) through which the a-threaded end of the hinged support shaft (10) passes through the stepped hole (31), and the shoulder at the root of the a-threaded end is axially positioned and matched with the stepped hole (31); and the a-threaded end of the hinged support shaft (10) is locked with a locking nut (32).

5. The indexable clamping system for increasing the number of rotary axes of a four-axis machining center worktable according to claim 4, characterized in that: The first support plate (1a), the second support plate (1b) and the swivel support plate (7) are respectively provided with a first card slot (2a), a second card slot (2b) and a third card slot (8) on the inner side of one end away from the structural plate (12); It also includes a locking beam (6), which is located on a side of the two hinged plates (5) away from the structural plate (12), and the locking beam (6) is parallel to the hinged plates (5); In state A: the two ends of the locking beam (6) are respectively clamped in the first clamping groove (2a) and the third clamping groove (8); In state B: the two ends of the locking beam (6) are respectively clamped in the second clamping groove (2b) and the third clamping groove (8).

6. The indexable clamping system for increasing the number of rotary axes of a four-axis machining center worktable according to claim 5, characterized in that: The locking beam (6) is provided with an axial through hole (33) extending vertically therethrough, and the b-threaded end of the hinged support shaft (10) passes through the axial through hole (33), and the b-threaded end of the hinged support shaft (10) is locked with a b-locking nut (11); the hinged support shaft (10) on the side of the locking beam (6) away from the b-locking nut (11) is provided with a compression-shaped push-up spring (13) on its outer sleeve, and the compression-shaped push-up spring (13) generates a pushing force on the locking beam (6).

7. The indexable clamping system for increasing the number of rotary axes of a four-axis machining center worktable according to claim 6, characterized in that: The bearing holes (20) on each hinge plate (5) are 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.

8. The working method of the indexable clamping system for increasing the number of rotary axes of the worktable of a four-axis machining center according to claim 7, characterized in that: The device is in the initial state of state A, in which the two ends of the locking beam (6) are respectively clamped in the first clamping groove (2a) and the third clamping groove (8), and the b locking nut (11) is completely locked; the outer side of the first supporting plate (1a) is fixedly clamped with the first workpiece (3a) through the clamping structure (4), and the outer side of the second supporting plate (1b) is fixedly clamped with the second workpiece (3b) through the clamping structure (4); the clamping process is now complete; Then the machine tool is turned on, and 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 disk, at which time the processing 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 rotary axis of the four-axis indexing disk and rotates around it, completing the processing content on the first feed normal surface of the second workpiece (3b) on the second support plate (1b); Then the program is paused, the b locking nut (11) is loosened, and under the elastic force of the compressed push spring (13), the two ends of the locking beam (6) are respectively disengaged from the first clamping groove (2a) and the third clamping groove (8), and then the first support plate (1a) and the second support plate (1b) are rotated 90 degrees around the virtual axis by a robot or by hand to enter the B state, and then the two ends of the locking beam (6) are respectively clamped in the second clamping groove (2b) and the third clamping groove (8), and then the b locking nut (11) is tightened again; The machine tool is turned on again, and 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 dividing plate, and the processing content on 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 rotary axis of the four-axis dividing plate and rotates around it, and the processing content on the first feed normal surface of the first workpiece (3a) clamped on the first support plate (1a) is completed.

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