A cutting device for cutting aluminum alloy castings

Abstract

The present invention discloses a cutting device for cutting aluminum alloy castings, which belongs to the field of cutting. It includes a base plate, a bracket A, a bracket B and a bracket C fixedly mounted on the base plate in sequence, a sleeve A fixedly mounted on the bracket B, a main shaft rotatably mounted inside the sleeve A and extending outside at both ends, a cutting knife fixedly mounted on the main shaft for cutting aluminum alloy castings, an elastic lifting rod slidably mounted along the vertical direction, a placement platform fixedly mounted on the upper end of the elastic lifting rod, two chuck assemblies for clamping aluminum alloy castings, a main shaft variable differential drive assembly that drives the main shaft to start and stop slowly and has a self-locking function, an electric telescopic rod that drives the elastic lifting rod to move up and down, and a chuck drive assembly that drives the chuck assembly to rotate around a fixed axis. The present invention is a cutting device with a reasonable structure, which can significantly eliminate the inertial impact force of the cutting knife during the start and stop process, has higher cutting stability, and can be used for cutting aluminum alloy castings.

Description

Technical Field

[0001] The invention mainly relates to the field of cutting, in particular to a cutting device for cutting aluminum alloy castings. Background Art

[0002] Aluminum alloy castings are widely used in aerospace, automobile, machinery manufacturing and other industrial applications due to their low density, high plasticity and high specific strength; aluminum alloy castings manufactured using casting technology usually need to be cut before use. Most of the cutting methods in the prior art are to manually operate the cutting knife to rotate it around the aluminum alloy casting to perform circumferential cutting operations. Although the prior art has achieved the cutting of aluminum alloy castings, there are still certain defects: First, for safety reasons, the cutting knife needs to be paused when replacing the aluminum alloy casting, that is, the cutting knife has a huge inertial impact force during the start-stop process; second, for thicker or coarser aluminum alloy castings, the cutting knife usually rotates circumferentially around the aluminum alloy casting, which obviously reduces the cutting stability. Therefore, it is urgent to design a cutting device with low inertial impact force and high stability cutting during the start-stop process. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in response to the technical problems existing in the prior art, the present invention provides a cutting device with a reasonable structure, which can significantly eliminate the inertial impact force of the cutting knife during the start-stop process, has higher cutting stability, and can be used for cutting aluminum alloy castings.

[0004] In order to solve the above problems, the solution proposed by the present invention is: a cutting device for cutting aluminum alloy castings, including a base plate, a bracket A, a bracket B and a bracket C fixedly mounted on the base plate from left to right in sequence, and also including: a sleeve A with an axis fixedly mounted on the bracket B along the horizontal direction, a main shaft rotatably mounted inside the sleeve A and extending outside at both ends, a cutting knife fixedly mounted on the main shaft for cutting aluminum alloy castings, an elastic lifting rod slidably mounted on the bracket C along the vertical direction, a placing platform fixedly mounted on the upper end of the elastic lifting rod, two chuck assemblies respectively located on the left and right sides of the cutting knife and rotatably mounted on the placing platform for clamping the aluminum alloy casting, a main shaft variable differential drive assembly that drives the main shaft to slowly start and stop and rotate and has a self-locking function, an electric telescopic rod that drives the elastic lifting rod to lift and lower, and a chuck drive assembly that drives the chuck assembly to rotate around a fixed axis.

[0005] The spindle variable differential drive assembly includes: a circular sun gear fixedly mounted on the shaft sleeve A, a curved sun gear fixedly mounted on the end of the spindle away from the cutting knife, a planetary carrier rotatably mounted on the bracket A, a plurality of composite planetary gears rotatably mounted on the planetary carrier and axially symmetrically distributed, and a motor A mounted on the bracket A for driving the planetary carrier to rotate; the composite planetary gear is meshed with the circular sun gear and the curved sun gear at the same time; when the planetary carrier rotates continuously, the spindle rotates intermittently, and the movement of the spindle from pause to movement and from movement to pause is very smooth.

[0006] Furthermore, the compound planetary gear includes a sleeve B rotatably mounted on the planet carrier, and a curvilinear planetary gear fixedly mounted on the sleeve B and always meshing with the curvilinear sun gear, and a circular planetary gear always meshing with the circular sun gear; the meshing line of the curvilinear planetary gear is a non-circular curve A, and there is a curve segment A on the non-circular curve A, whose radius of curvature is equal to the radius of the meshing circle of the circular planetary gear; the meshing line of the curvilinear sun gear is a non-circular curve B, and there is a curve segment B on the non-circular curve B, whose radius of curvature is equal to the radius of the meshing circle of the circular sun gear.

[0007] Furthermore, the minimum curvature radius of the non-circular curve A is equal to the meshing circle radius of the circular planetary gear, and the maximum curvature radius of the non-circular curve A is greater than the meshing circle radius of the circular planetary gear; the maximum curvature radius of the non-circular curve B is equal to the meshing circle radius of the circular sun gear, and the minimum curvature radius of the non-circular curve B is less than the meshing circle radius of the circular sun gear.

[0008] Furthermore, the chuck driving assembly includes: a chuck frame fixedly connected to one of the chuck assemblies, and a motor B installed on the placement platform for driving the chuck frame to rotate slowly.

[0009] Furthermore, the elastic lifting rod includes: a hollow rod whose upper end is fixedly connected to the placing platform, a solid rod whose upper end is slidably installed inside the hollow rod and whose lower end extends outside, and a metal coil spring installed inside the hollow rod and connected to the hollow rod and the solid rod at both ends respectively; the hollow rod is slidably connected to the bracket C through a linear bearing.

[0010] Furthermore, the chuck assembly is rotationally connected to the placement platform by means of geometric locking.

[0011] Compared with the prior art, the present invention has the following advantages and beneficial effects: a cutting device for cutting aluminum alloy castings of the present invention is provided with a spindle-differential drive assembly to drive the planet carrier to rotate continuously and uniformly, wherein when the radius of curvature at the meshing point of the curved planetary gear is equal to the meshing circle radius of the circular planetary gear, and the radius of curvature at the meshing point of the curved sun gear is equal to the meshing circle radius of the circular sun gear, the spindle and the cutting knife are locked by the position of the curved sun gear, thereby achieving a brief stillness; when the radius of curvature at the meshing point of the curved planetary gear is not equal to the meshing circle radius of the circular planetary gear, or the radius of curvature at the meshing point of the curved sun gear is equal to the meshing circle radius of the circular sun gear, the cutting knife cuts the aluminum alloy casting in a differential manner; since the curved planetary gear is always meshed with the curved sun gear, the movement of the spindle from pause to movement and from movement to pause is very gentle during the continuous rotation of the planet carrier, thereby significantly reducing the inertial impact force of the cutting knife during the start-stop process. In addition, the present invention is also provided with an electric telescopic rod for driving the lifting movement of the aluminum alloy casting and a chuck driving assembly for driving the aluminum alloy casting to rotate, thereby forming a circumferential cutting mode in which the cutting knife rotates on a fixed axis and the aluminum alloy casting rotates, thereby improving the movement stability of the cutting knife during the cutting process. It can be seen from this that the present invention is a cutting device with a reasonable structure, which can significantly eliminate the inertial impact force of the cutting knife during the start-stop process, has higher cutting stability, and can be used for cutting aluminum alloy castings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention is a schematic diagram of the structural principle of a cutting device for cutting aluminum alloy castings.

[0013] Figure 2 It is a schematic diagram of the meshing of the curvilinear planetary gear and the curvilinear sun gear in the present invention.

[0014] In the figure, 10 is a base plate; 11 is a bracket A; 12 is a bracket B; 13 is a bracket C; 20 is a bushing A; 21 is a main shaft; 22 is a cutting knife; 23 is a placing platform; 24 is a chuck assembly; 25 is an elastic lifting rod; 26 is an aluminum alloy casting; 31 is a motor A; 32 is a circular sun gear; 33 is a curved sun gear; 34 is a bushing B; 35 is a circular planetary gear; 36 is a curved planetary gear; 37 is a planetary frame; 4 is an electric telescopic rod; 51 is a motor B; 52 is a chuck frame. DETAILED DESCRIPTION

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] See also Figure 1 and Figure 2A cutting device for cutting aluminum alloy castings of the present invention comprises a base plate 10, a bracket A11, a bracket B12 and a bracket C13 fixedly mounted on the base plate 10 from left to right in sequence, a sleeve A20 whose axis is fixedly mounted on the bracket B12 along a horizontal direction, a main shaft 21 rotatably mounted inside the sleeve A20 and extending outside at both ends, a cutting knife 22 fixedly mounted on the main shaft 21 for cutting aluminum alloy castings 26, an elastic lifting rod 25 slidably mounted on the bracket C13 along a vertical direction, a placing platform 23 fixedly mounted on the upper end of the elastic lifting rod 25, two chuck assemblies 24 respectively located on the left and right sides of the cutting knife 22 and rotatably mounted on the placing platform 23 for clamping the aluminum alloy casting 26, a main shaft variable differential drive assembly that drives the main shaft 21 to slowly start and stop and rotate and has a self-locking function, an electric telescopic rod 4 that drives the elastic lifting rod 25 to move up and down, and a chuck drive assembly that drives the chuck assembly 24 to rotate around a fixed axis. In a specific implementation, the main shaft 21 is rotatably connected to the sleeve A20 by a rolling bearing, and the circular sun gear 32 is coaxially installed with the main shaft 21 and the cutting blade 22 .

[0017] The main shaft variable differential drive assembly includes: a circular sun gear 32 fixedly mounted on the sleeve A20, a curved sun gear 33 fixedly mounted on the end of the main shaft 21 away from the cutting blade 22, a planetary carrier 37 rotatably mounted on the bracket A11, a plurality of composite planetary gears rotatably mounted on the planetary carrier 37 and distributed in an axisymmetric manner, and a motor A31 mounted on the bracket A11 for driving the planetary carrier 37 to rotate; the composite planetary gears mesh with the circular sun gear 32 and the curved sun gear 33 at the same time; when the planetary carrier 37 rotates continuously, the main shaft 21 rotates intermittently, and the movement of the main shaft 21 from pause to movement and from movement to pause is very gentle. In specific implementation, the curved sun gear 33 is a special-shaped gear with a non-circular meshing line, and the composite planetary gear is composed of a circular gear mounted coaxially and synchronously and a non-circular gear with a non-circular meshing line.

[0018] Preferably, the compound planetary gear includes a sleeve B34 rotatably mounted on the planet carrier 37, and a curvilinear planetary gear 36 fixedly mounted on the sleeve B34 and always meshing with the curvilinear sun gear 33, and a circular planetary gear 35 always meshing with the circular sun gear 32; the meshing line of the curvilinear planetary gear 36 is a non-circular curve A, and there is a curve segment A on the non-circular curve A, whose radius of curvature is equal to the meshing circle radius of the circular planetary gear 35; the meshing line of the curvilinear sun gear 33 is a non-circular curve B, and there is a curve segment B on the non-circular curve B, whose radius of curvature is equal to the meshing circle radius of the circular sun gear 32.

[0019] Preferably, the minimum curvature radius of the non-circular curve A is equal to the meshing circle radius of the circular planetary gear 35, and the maximum curvature radius of the non-circular curve A is greater than the meshing circle radius of the circular planetary gear 35; the maximum curvature radius of the non-circular curve B is equal to the meshing circle radius of the circular sun gear 32, and the minimum curvature radius of the non-circular curve B is less than the meshing circle radius of the circular sun gear 32. In specific implementation, the curved planetary gear 36 and the curved sun gear 33 are always meshed and driven. When the curvature radius of the meshing point on the non-circular curve A in the curved planetary gear 36 is equal to the meshing circle radius of the circular planetary gear 35, the curvature radius of the meshing point on the non-circular curve B in the curved sun gear 33 must be equal to the meshing circle radius of the circular sun gear 32; when the curvature radius of the meshing point on the non-circular curve A in the curved planetary gear 36 is greater than the meshing circle radius of the circular planetary gear 35, the curvature radius of the meshing point on the non-circular curve B in the curved sun gear 33 is less than the meshing circle radius of the circular sun gear 32.

[0020] Preferably, the chuck drive assembly includes: a chuck frame 52 fixedly connected to one of the chuck assemblies 24, and a motor B51 installed on the placement platform 23 for driving the chuck frame 52 to rotate slowly.

[0021] Preferably, the elastic lifting rod 25 includes: a hollow rod whose upper end is fixedly connected to the placement platform 23, a solid rod whose upper end is slidably installed inside the hollow rod and whose lower end extends outside, and a metal coil spring installed inside the hollow rod and connected to the hollow rod and the solid rod at both ends respectively; the hollow rod is slidably connected to the bracket C13 through a linear bearing.

[0022] Preferably, the chuck assembly 24 is rotatably connected to the placement platform 23 by means of geometric locking. In specific implementation, the chuck assembly 24 is formed by a conventional chuck in the prior art being fixedly connected to a rolling bearing, and an arc groove matching the rolling bearing is provided on the placement platform 23, and the arc groove can clamp the outer ring of the rolling bearing, so that the chuck assembly 24 can roll relative to the placement platform 23 without leaving the arc groove.

[0023] The working principle of the spindle variable differential drive assembly in the present invention is as follows: the motor A31 drives the planet carrier 37 to rotate continuously at a uniform speed, so that the circular planetary gear 35 rolls on the stationary circular sun gear 32, the curved planetary gear 36 meshes with the curved sun gear 33 for transmission, and the spindle 21 and the cutting knife 22 rotate at a variable speed or stop for a short time. When the radius of curvature at the meshing point on the curved planetary gear 36 is equal to the meshing circle radius of the circular planetary gear 35, and the radius of curvature at the meshing point on the curved sun gear 33 is equal to the meshing circle radius of the circular sun gear 32, since the circular planetary gear 35 and the curved planetary gear 36 rotate coaxially and synchronously, at this time, the linear velocity of the meshing point of the circular planetary gear 35 and the circular sun gear 32 is equal to the linear velocity of the meshing point of the curved planetary gear 36 and the curved sun gear 33, and the curved sun gear 33 is stationary, that is, the main shaft 21 and the cutting knife 22 fixedly mounted on the main shaft 21 stop rotating, and the cutting knife 22 is locked in position by the curved sun gear 33 during the process of suspending rotation; when the radius of curvature at the meshing point on the curved planetary gear 36 is not equal to the meshing circle radius of the circular planetary gear 35, or the radius of curvature at the meshing point on the curved sun gear 33 is not equal to the meshing circle radius of the circular sun gear 32, the curved sun gear 33 rotates under the meshing action of the curved planetary gear 36, that is, the main shaft 21 and the cutting knife 22 rotate. Since there is a curve segment A on the non-circular curve A whose radius of curvature is equal to the radius of the meshing circle of the circular planetary gear 35, and there is a curve segment B on the non-circular curve B whose radius of curvature is equal to the radius of the meshing circle of the circular sun gear 32, during the process of the motor A31 driving the planetary carrier 37 to rotate continuously, there is a period of suspension of the rotation of the main shaft 21 and the cutting knife 22, and there is no sudden acceleration process during the start and stop processes of the cutting knife 22, that is, the transmission of the cutting knife 22 from suspension to rotation or from rotation to suspension is very smooth, which significantly reduces the inertial cutting force during the start and stop process.

[0024] The working process of the present invention is as follows: in the first step, the two ends of the aluminum alloy casting 26 to be cut are placed in the two chuck assemblies 24, and the position directly below the cutting knife 22 corresponds to the position of the aluminum alloy casting 26 to be cut; in the second step, the motor A31 is started to drive the planetary frame 37 to rotate continuously at a uniform speed, thereby driving the main shaft 21 and the cutting knife 22 to change speed or stop rotating through the composite planetary gear; in the third step, the electric telescopic rod 4 drives the placement platform 23 to move upward, so that the cutting knife 22 and the aluminum alloy casting 26 are in conflict under a certain pressure, that is, the elastic lifting rod 25 undergoes a certain compression deformation; in the fourth step, the motor B51 is started, so that the chuck assembly 24 drives the aluminum alloy casting 26 to rotate, so that the cutting knife 22 cuts the aluminum alloy casting 26 along the circumferential direction; after the cutting is completed, the aluminum alloy casting 26 can be replaced while the cutting knife 22 is stationary.

[0025] The above are only specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should fall within the protection scope of the present invention.

Claims

1. A cutting device for cutting aluminum alloy castings, comprising a base plate (10), a bracket A (11), a bracket B (12), and a bracket C (13) fixedly mounted on the base plate (10) from left to right, characterized in that: Also includes: A shaft sleeve A (20) is fixedly mounted on the support B (12) along the horizontal direction, a main shaft (21) is rotatably mounted inside the shaft sleeve A (20) and has two ends extending outside, a cutting knife (22) is fixedly mounted on the main shaft (21) for cutting an aluminum alloy casting (26), an elastic lifting rod (25) is slidably mounted on the support C (13) along the vertical direction, a placement platform (23) is fixedly mounted on the upper end of the elastic lifting rod (25), two chuck assemblies (24) are respectively located on the left and right sides of the cutting knife (22) and are rotatably mounted on the placement platform (23) for clamping the aluminum alloy casting (26), a main shaft variable differential drive assembly that drives the main shaft (21) to slowly start and stop and rotate and has a self-locking function, an electric telescopic rod (4) that drives the elastic lifting rod (25) to move up and down, and a chuck drive assembly that drives the chuck assembly (24) to rotate around a fixed axis; The spindle variable differential drive assembly comprises: a circular sun gear (32) fixedly mounted on the shaft sleeve A (20), a curved sun gear (33) fixedly mounted on the end of the spindle (21) away from the cutting blade (22), a planet carrier (37) rotatably mounted on the bracket A (11), a plurality of composite planetary gears rotatably mounted on the planet carrier (37) and axially symmetrically distributed, and a motor A (31) mounted on the bracket A (11) for driving the planet carrier (37) to rotate; the composite planetary gears mesh with the circular sun gear (32) and the curved sun gear (33) at the same time; when the planet carrier (37) rotates continuously, the spindle (21) rotates intermittently, and the movement of the spindle (21) from pause to movement and from movement to pause is very gentle; The compound planetary gear comprises a shaft sleeve B (34) rotatably mounted on the planet carrier (37), and a curvilinear planetary gear (36) fixedly mounted on the shaft sleeve B (34) and always meshing with the curvilinear sun gear (33), and a circular planetary gear (35) always meshing with the circular sun gear (32); the meshing line of the curvilinear planetary gear (36) is a non-circular curve A, and there is a curve segment A on the non-circular curve A, the radius of curvature being equal to the radius of the meshing circle of the circular planetary gear (35); the meshing line of the curvilinear sun gear (33) is a non-circular curve B, and there is a curve segment B on the non-circular curve B, the radius of curvature being equal to the radius of the meshing circle of the circular sun gear (32); The minimum curvature radius of the non-circular curve A is equal to the meshing circle radius of the circular planetary gear (35), and the maximum curvature radius of the non-circular curve A is greater than the meshing circle radius of the circular planetary gear (35); the maximum curvature radius of the non-circular curve B is equal to the meshing circle radius of the circular sun gear (32), and the minimum curvature radius of the non-circular curve B is less than the meshing circle radius of the circular sun gear (32).

2. A cutting device for cutting aluminum alloy castings according to claim 1, characterized in that: The chuck drive assembly comprises: a chuck frame (52) fixedly connected to one of the chuck assemblies (24), and a motor B (51) mounted on the placement platform (23) and used for driving the chuck frame (52) to rotate slowly.

3. A cutting device for cutting aluminum alloy castings according to claim 1, characterized in that: The elastic lifting rod (25) comprises: a hollow rod whose upper end is fixedly connected to the placement platform (23), a solid rod whose upper end is slidably mounted inside the hollow rod and whose lower end extends outside, and a metal coil spring mounted inside the hollow rod and whose two ends are respectively connected to the hollow rod and the solid rod; the hollow rod is slidably connected to the bracket C (13) through a linear bearing.

4. A cutting device for cutting aluminum alloy castings according to claim 1, characterized in that: The chuck assembly (24) is rotationally connected to the placement platform (23) by means of geometric locking.

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