Multi-axis rotary table

Abstract

The present invention discloses a multi-axis turntable, comprising a base, a rocker arm and a first driving device capable of driving the rocker arm to rock around a first rotation axis on the base, the rocker arm is provided with a swing arm and a second driving device capable of driving the swing arm to swing around a second rotation axis on the rocker arm, the swing arm is provided with a worktable and a third driving device for driving the worktable to rotate around a third rotation axis, and the second rotation axis and the third rotation axis are parallel to each other or out of plane with each other. Compared with the existing double-rotating-axis turntable, the multi-axis turntable of the present invention has a tool system with good and stable rigidity, so that the workpiece can obtain consistent and stable surface quality, has better control characteristics and processing accuracy, has a small interference area, better accessibility, and is also conducive to obtaining good overall machine rigidity. In the transformation of old equipment, the present invention can be applied to expand the processing range of the machine tool without changing the three-axis stroke, and has broad application prospects in many industries.

Description

Technical Field

[0001] The invention relates to the technical field of machine tools, and in particular to a multi-axis turntable. Background Art

[0002] At present, the common double-rotating axis turntable is generally composed of a swinging rotating axis and a rotating axis. The two rotating axes are generally arranged at an intersection or offset by a certain distance. Once the design and manufacturing are completed, they cannot be changed. Figure 1 The existing rotary table is suitable for processing workpieces with the same size as the worktable surface. When processing smaller workpieces, in order to approach the processing area, a longer tool needs to be used, or the spindle needs to be extended longer, which leads to poor rigidity of the tool system, reduced surface quality of the workpiece, or even dimensional deviation. This makes the existing rotary table limited in the size of the processed parts, and lacks versatility and flexibility. Summary of the invention

[0003] The present invention aims at solving the above problems and designs a multi-axis turntable. The technical means adopted by the present invention are as follows:

[0004] A multi-axis turntable includes a base, a rocker arm and a first driving device capable of driving the rocker arm to rock around a first rotation axis on the base; the rocker arm is provided with a swing arm and a second driving device capable of driving the swing arm to swing around a second rotation axis on the rocker arm; the swing arm is provided with a workbench and a third driving device for driving the workbench to rotate around a third rotation axis; the second rotation axis and the third rotation axis are parallel to or skewed with each other.

[0005] Furthermore, the first rotation axis intersects with the second rotation axis or is not aligned with each other.

[0006] Further, the swing angle of the swing arm ranges from 0° to 180°. The swing angle of the swing arm is the angle between the first rotation axis and the line connecting the third rotation axis and the second rotation axis in the plane of the worktable.

[0007] Further, as the swing angle of the swing arm changes from 0° to 180°, the normal distance from the third rotation axis to the first rotation axis first increases monotonically and then decreases monotonically, or first decreases monotonically and then increases monotonically.

[0008] Furthermore, as the swing angle of the swing arm changes from 0° to 90°, the normal distance from the third rotation axis to the first rotation axis increases monotonically; as the swing angle of the swing arm changes from 90° to 180°, the normal distance from the third rotation axis to the first rotation axis decreases monotonically.

[0009] Furthermore, the first driving device and the second driving device each include a motor and a reducer, and the third driving device is a torque motor that directly drives the power mechanism.

[0010] Compared with the prior art, the multi-axis turntable of the present invention has the following advantages:

[0011] (1) Compared with the existing dual-rotation axis turntable, the multi-axis turntable of the present invention introduces a swingable swing arm, so that the normal distance from the third rotation axis to the first rotation axis can be continuously adjusted. Regardless of the size of the workpiece, by adjusting the swing angle, the workpiece processing area can be concentrated as close to the first rotation axis as possible. The overhang length of the tool or the overhang of the spindle is basically stable in a very small range. The tool system has good and stable rigidity, so the workpiece can obtain consistent and stable surface quality.

[0012] (2) Since the workpiece processing area is concentrated as much as possible near the first rotation axis, the processing area is concentrated, and the follow-up compensation movement distance of each axis is greatly reduced, which has better control characteristics and processing accuracy.

[0013] (3) The workpiece is basically offset to one side of the first rotation axis, and the other side can save space for basic components such as linear axes, so that the interference area is small, the accessibility is better, and it is also conducive to obtaining good overall machine rigidity.

[0014] (4) In the reconstruction of old equipment, the present invention can be applied to expand the processing range of the machine tool and improve the processing accuracy without changing the three-axis travel.

[0015] (5) The multi-axis turntable of the present invention is suitable for, but not limited to, the processing of impellers and blade disks in the aviation field. It can also be applied to gears and propellers, and has broad application prospects in industries such as gas turbines, marine propellers, water pumps, and fans. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a double-rotating-axis turntable in the prior art.

[0017] Figure 2 It is a structural diagram of embodiment 1 of the present invention.

[0018] Figure 3 It is a schematic projection diagram of a work surface according to the first embodiment of the present invention.

[0019] Figure 4 It is a schematic diagram of the workpiece processing state of the first embodiment of the present invention.

[0020] Figure 5 yes Figure 4 AA cross-sectional view of .

[0021] Figure 6 It is a structural diagram of embodiment 2 of the present invention.

[0022] Figure 7 It is a structural diagram of embodiment 3 of the present invention.

[0023] In the figure: 1, base, 2, rocker arm, 3, first support bearing, 4, swing arm, 5, second support bearing, 6, worktable, 7, first drive device, 8, second drive device, 9, third drive device, 10, workpiece, 11, spindle and tool, 1a, first rotation axis, 2a, second rotation axis, 3a, third rotation axis, α, swing angle, L, normal distance, L23, distance between the line connecting the third rotation axis and the second rotation axis projected onto the plane of the worktable. DETAILED DESCRIPTION

[0024] Embodiment 1

[0025] like Figures 2 to 5 As shown, a multi-axis turntable includes a base 1, a rocker arm 2 and a first driving device 7 that can drive the rocker arm 2 to rock around a first rotation axis 1a on the base 1, the rocker arm 2 is set on the base 1 through a first supporting bearing 3, the rocker arm 2 is provided with a swing arm 4 and a second driving device 8 that can drive the swing arm 4 to swing around a second rotation axis 2a on the rocker arm 2, the swing arm 4 is provided with a workbench 6 and a third driving device 9 for driving the workbench 6 to rotate around a third rotation axis 3a, the second rotation axis 2a and the third rotation axis 3a are parallel to each other or skewed with each other, so that they are offset by a certain distance, and preferably they are parallel to each other.

[0026] The first rotation axis 1a and the second rotation axis 2a intersect or are not in the same plane with each other, that is, the first rotation axis 1a and the second rotation axis 2a intersect or there is a certain distance between them, and preferably the two are arranged to intersect.

[0027] The swing angle α of the swing arm 4 ranges from 0° to 180°. The swing angle α of the swing arm 4 is the angle between the line L23 connecting the third rotation axis 3a and the second rotation axis 2a in the plane of the workbench 6 and the first rotation axis.

[0028] As the swing angle α of the swing arm 4 changes from 0° to 180°, when the swing arm 4 rotates around the second rotation axis 2a, the normal distance L from the third rotation axis 3a of the worktable 6 to the first rotation axis 1a changes in a linear curve according to the law of function with the swing angle α. The normal distance L from the third rotation axis 3a to the first rotation axis 1a is continuously adjustable. Regardless of the size of the workpiece, by adjusting the swing angle, the workpiece processing area is concentrated as much as possible near the first rotation axis. The overhang of the tool or the overhang of the spindle is basically stable in a very small range. The tool system has good and stable rigidity, so the workpiece can obtain consistent and stable surface quality. As a preferred embodiment, the normal distance L from the third rotation axis 3a to the first rotation axis 1a first increases monotonically and then decreases monotonically, or first decreases monotonically and then increases monotonically. As a more preferred embodiment, as the swing angle of the swing arm changes from 0° to 90°, the normal distance L from the third rotation axis 3a to the first rotation axis 1a increases monotonically; as the swing angle of the swing arm changes from 90° to 180°, the normal distance from the third rotation axis to the first rotation axis decreases monotonically. That is to say, when the line L23 connecting the third rotation axis 3a and the second rotation axis 2a in the plane of the workbench 6 is in the third quadrant, the normal distance L from the third rotation axis 3a to the first rotation axis 1a increases or decreases monotonically, and correspondingly, in the fourth quadrant, the normal distance L from the third rotation axis 3a to the first rotation axis 1a decreases or increases monotonically.

[0029] The first driving device 7 and the second driving device 8 both include a motor and a reducer, and the third driving device 9 is a torque motor directly driving a power mechanism. The rocker arm 2 of this embodiment is a rocker arm with a two-end support structure, and both ends of the rocker arm 2 are arranged on the base 1 through a first support bearing 3, and a first driving device 7 is arranged at one end to drive the rocker arm 2 to rock.

[0030] Since the processing area of ​​this embodiment is concentrated, the follow-up compensation movement distance of each axis is greatly reduced, and it has better control characteristics. The workpiece is basically offset to one side of the first rotation axis, and the space of basic components such as linear axes can be saved on the other side, so that the interference area is small, the accessibility is better, and it is also conducive to obtaining good rigidity of the whole machine. At the same time, in the transformation of old equipment, the application of the present invention does not need to change the three-axis stroke, and the processing range of the machine tool can be expanded. This embodiment is not limited to the processing of impellers and blades in the aviation field, but can also be applied to gears and propellers. It has broad application prospects in gas turbines, marine propellers, water pumps, fans and other industries.

[0031] Embodiment 2

[0032] like Figure 6 As shown, the difference between this embodiment and the first embodiment is that corresponding first driving devices 7 are provided at both ends of the rocker arm 2 to drive the rocker arm to move on both sides. The other structures of this embodiment are the same as those of the first embodiment.

[0033] Embodiment 3

[0034] like Figure 7 As shown, the difference between this embodiment and the first embodiment is that one end of the rocker arm 2 is arranged on the base 1 through the first support bearing 3, and a first driving device 7 is arranged at the end of the rocker arm 2. The other structures of this embodiment are the same as those of the first embodiment.

[0035] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A multi-axis turntable, comprising a base, a rocker arm and a first driving device capable of driving the rocker arm to rock around a first rotation axis on the base, characterized in that: The rocker arm is provided with a swing arm and a second driving device capable of driving the swing arm to swing around a second rotation axis on the rocker arm; the swing arm is provided with a workbench and a third driving device for driving the workbench to rotate around a third rotation axis; the second rotation axis and the third rotation axis are parallel to each other; the first driving device and the second driving device both include a motor and a reducer, and the third driving device is a torque motor directly driving a power mechanism; the first rotation axis intersects with the second rotation axis; Both ends of the rocker arm are provided with a first driving device; or, one end of the rocker arm is arranged on the base through a first supporting bearing, and the first driving device is arranged on one end of the base where the first supporting bearing is arranged.

2. The multi-axis turntable according to claim 1, characterized in that: The swing angle range of the swing arm is 0° to 180°.

3. The multi-axis turntable according to claim 2, characterized in that: As the swing angle of the swing arm changes from 0° to 180°, the normal distance from the third rotation axis to the first rotation axis first increases monotonically and then decreases monotonically, or first decreases monotonically and then increases monotonically.

4. The multi-axis turntable according to claim 3, characterized in that: As the swing angle of the swing arm changes from 0° to 90°, the normal distance from the third rotation axis to the first rotation axis increases monotonically; as the swing angle of the swing arm changes from 90° to 180°, the normal distance from the third rotation axis to the first rotation axis decreases monotonically.

Images