Laser additive repairing device and method suitable for shaft key groove

Abstract

The invention belongs to the technical field of laser additive repairing, and discloses a laser additive repairing device and method suitable for a shaft key groove, the laser additive repairing device comprises a carrier, a powder feeding pipe, a laser and a horizontal rotating mechanism, the carrier is used for being connected with a numerical control machine tool, and the powder feeding pipe is arranged on the carrier and used for conveying powder for a repaired wall of a workpiece; the laser is obliquely arranged on the carrier and used for cladding powder on the repaired wall of a workpiece, and the horizontal rotating mechanism is arranged on the carrier and used for driving the laser to rotate with the vertical line where a powder outlet of the powder feeding pipe is located as the axis. When a deeper key groove wall is machined, the laser forming a certain included angle with the powder feeding pipe can be prevented from interfering with the powder feeding pipe, so that a deeper key groove can be machined.

Description

Technical Field

[0001] The present invention relates to the technical field of laser additive repair, and in particular to a laser additive repair device and method suitable for shaft keyways. Background Art

[0002] When the keyway on the shaft is damaged by wear, the key and the keyway wall will gradually become thinner. A loose fit will cause shaking. Long-term shaking and impact will cause the key and keyway to fatigue, deform, crack and finally break, causing the gear to disengage and cause downtime.

[0003] A Chinese patent with patent application number 201510593912.9 discloses a nuclear power plant pump shaft repair process. After determining the pump shaft repair plan, the invention performs laser cladding on the keyway position. However, an overly deep keyway will interfere with the laser and fail to achieve a deep repair effect.

[0004] A Chinese patent application with patent application number 202321051726.9 discloses a repair tool for the worn keyway of a spindle of a machining center. The invention uses a homemade tool to fix the spindle to repair the worn keyway of the shaft. However, the tool is large in size and requires adjustment of the position of the clamped shaft for processing, which makes the operation more complicated during actual application.

[0005] Based on the above problems, the applicant proposes a laser additive repair device and method suitable for shaft keyways. Summary of the invention

[0006] The object of the present invention is to provide a laser additive repair device and method suitable for shaft keyways to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: A laser additive repair device suitable for a shaft keyway, comprising: A carrier, the carrier being used to connect to a numerically controlled machine tool; A powder delivery pipe, which is arranged on the carrier and is used to deliver powder to the repaired wall of the workpiece; A laser, which is tiltedly disposed on a carrier and is used to melt and clad powder on a repaired wall of a workpiece; and The horizontal rotating mechanism is arranged on the carrier and is used to drive the laser to rotate with the vertical line where the powder outlet of the powder feeding pipe is located as the axis.

[0008] Furthermore, the powder delivery pipe is a straight pipe and is vertically arranged on the carrier.

[0009] Furthermore, the horizontal rotation mechanism includes a horizontal rotation drive assembly and a movable turntable, the movable turntable is rotatably mounted on the carrier, and its rotation axis is a vertical line. The laser is tiltedly arranged on the movable turntable, and the horizontal rotation drive assembly is arranged on the carrier and drives the movable turntable to rotate.

[0010] Furthermore, the horizontal rotation driving assembly includes a motor, a driving gear and a driven gear, the motor is arranged on a carrier, the driving gear is connected to an output shaft of the motor, the driven gear is sleeved on a movable turntable, and the driving gear is meshed with the driven gear.

[0011] Furthermore, the laser is located at the lower end of the movable turntable.

[0012] Furthermore, the movable turntable is rotatably sleeved outside the powder delivery pipe.

[0013] Furthermore, it also includes an angle adjustment mechanism, and the angle adjustment mechanism is used to adjust the inclination of the laser.

[0014] Furthermore, the angle adjustment mechanism includes a movable plate and a support plate, the movable plate is used to install the laser, one end of the movable plate is rotatably connected to the movable turntable, the other end is rotatably connected to one end of the support plate, and the other end of the support plate is horizontally slidably connected to the movable turntable.

[0015] Furthermore, the angle adjustment mechanism also includes a slide slot seat connected to the movable turntable, a slide slot is horizontally arranged on the slide slot seat, and two locking parts are relatively arranged on the upper end of the support plate, the two locking parts are located on both sides of the slide slot, and adjusting bolts are passed through the two locking parts, the adjusting bolts are slidably matched with the slide slot, and one end of the adjusting bolt is threadedly connected to a fastening nut, and the fastening nut locks the two locking parts on the slide slot seat.

[0016] The present invention also provides a repair method for the laser additive repair device as described above, comprising: Step 1, clamping the workpiece; Step 2, adjusting the angle adjustment mechanism to create a suitable inclination angle between the laser light path and the repaired wall of the workpiece; Step 3, repairing the repaired wall of the workpiece, the powder feeding tube feeds powder to the repaired wall of the workpiece, and the laser clads the powder on the repaired wall. When processing the straight surface of the keyway wall, the axial projection of the laser light path is perpendicular to the straight surface of the keyway wall, and processing is performed layer by layer from the inside to the outside; when processing the curved surface of the keyway wall, the horizontal rotation mechanism is adjusted in real time to ensure that the axial projection of the laser light path is always perpendicular to the curved surface of the keyway wall.

[0017] Compared with the prior art, the beneficial effect of the present invention is that when processing a deeper keyway wall, the laser having a certain angle with the powder feeding tube can avoid interference therewith, so as to process a deeper keyway. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is one of the schematic diagrams of the structure of the use state of a laser additive repair device suitable for a shaft keyway of the present invention.

[0019] Figure 2 The figure is a schematic structural diagram of a laser additive repair device suitable for a shaft keyway according to the present invention.

[0020] Figure 3 The figure is a schematic diagram of the cross-sectional structure of a laser additive repair device suitable for a shaft keyway according to the present invention.

[0021] Figure 4 The present invention is a schematic diagram of a support plate structure in a laser additive repair device suitable for a shaft keyway.

[0022] Figure 5 This is a flow chart of a repair method of the laser additive repair device as described above according to the present invention.

[0023] In the figure: carrier 1, powder feeding tube 2, laser 3, movable turntable 4, motor 5, driving gear 7, driven gear 6, movable plate 8, support plate 9, slide seat 10, slide 1000, adjusting bolt 11, workpiece 12, repaired wall 1200, fixed top cover 13, mounting seat 14, fastening nut 15. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-Figure 4, a laser additive repair device suitable for shaft keyway, including a carrier 1, on which a mounting seat 14, a powder feeding tube 2, a laser 3 and a horizontal rotation mechanism are arranged. The carrier 1 is a flat plate structure, and the mounting seat 14 is located at the upper end of the carrier 1. The carrier 1 is connected to the three-axis CNC machine tool through the mounting seat 14. The mounting seat 14 is provided with a mounting hole for connecting to the end fixture of the three-axis CNC machine tool, and is connected to the three-axis CNC machine tool through bolts and nuts, and has reinforcing ribs to strengthen the overall rigidity. The powder feeding tube 2 is arranged at the lower end of the carrier 1, and the upper end of the powder feeding tube 2 is connected to the alloy powder feeder. The diameter of the powder feeding tube 2 is between 0.5mm and 3mm, and it is used to transport powder to the repaired wall 1200 of the workpiece 12. The laser 3 is arranged obliquely at the lower end of the carrier 1 and is located on one side of the powder feeding tube 2, and it is used to melt the powder on the repaired wall 1200 of the workpiece 12. The horizontal rotating mechanism is arranged on the carrier 1, and is used to drive the laser 3 to rotate with the vertical line where the powder outlet of the powder feeding pipe 2 is located as the axis.

[0026] Continue reading Figure 1-Figure 4 In one embodiment of the present invention, the powder delivery tube 2 is a straight tube, which is vertically arranged on the carrier 1, and the horizontal rotation mechanism drives the laser 3 to rotate with the center line of the powder delivery tube 2 as the axis.

[0027] Continue reading Figure 1-Figure 4 In one embodiment of the present invention, the horizontal rotation mechanism includes a horizontal rotation drive assembly and a movable turntable 4, the movable turntable 4 is located at the lower end of the carrier 1 and is rotatably sleeved outside the powder delivery pipe 2, the rotation axis of the movable turntable 4 is a vertical line, the laser 3 is obliquely arranged at the lower end of the movable turntable 4, and the horizontal rotation drive assembly is arranged on the carrier 1 and drives the movable turntable 4 to rotate. The light path emitted by the laser 3 and the powder delivery path of the powder delivery pipe 2 converge at one point, and when the laser 3 rotates, the position of the convergence point remains unchanged.

[0028] A fixed top cover 13 is further provided at the upper end of the carrier 1 , the upper end of the powder delivery pipe 2 is fixedly connected to the fixed top cover 13 , and the upper end of the movable turntable 4 is rotatably matched with the fixed top cover 13 .

[0029] Continue reading Figure 1-Figure 4 In one embodiment of the present invention, the horizontal rotation driving assembly includes a motor 5, a driving gear 7 and a driven gear 6. The motor 5 is arranged at the upper end of the carrier 1, the driving gear 7 is located at the lower end of the carrier 1 and is connected to the output shaft of the motor 5. The driven gear is sleeved on the movable turntable 4, and the driving gear 7 is meshed with the driven gear 6.

[0030] In other embodiments, an intermediate gear may be added between the driving gear 7 and the driven gear 6, or the tooth transmission structure may be replaced by a sprocket transmission structure, a pulley transmission structure, or the like.

[0031] When the horizontal rotating mechanism is working, the motor 5 drives the driving gear 7 to rotate, the driving gear 7 drives the driven gear 6 to rotate, and the driven gear 6 drives the movable turntable 4 to rotate together with the laser 8.

[0032] Continue reading Figure 1-Figure 4 In one embodiment of the present invention, the laser additive repair device also includes an angle adjustment mechanism, which is used to adjust the inclination of the laser 3. The angle adjustment mechanism includes a movable plate 8 and a support plate 9. The movable plate 8 is used to install the laser 3. One end of the movable plate 8 is rotatably connected to the movable turntable 4, and the other end is rotatably connected to one end of the support plate 9. The other end of the support plate 9 is horizontally slidably connected to the movable turntable 4.

[0033] Further reading Figure 1-Figure 4 In one embodiment of the present invention, the angle adjustment mechanism further comprises a chute seat 10 disposed at the bottom of the movable turntable 4, a chute 1000 is horizontally disposed on the chute seat 10, and the chute 1000 is disposed toward the powder delivery tube 2, and two locking parts 900 are disposed oppositely at the upper end of the support plate 9, and the two locking parts 900 are located on both sides of the chute 1000, and the two locking parts 900 are penetrated by an adjusting bolt 11, and the adjusting bolt 11 is slidably matched with the chute 1000, and one end of the adjusting bolt 11 is screwed with a fastening nut 15, and the fastening nut 15 locks the two locking parts 900 on the chute seat 10, thereby locking the support plate 9 after the angle is adjusted. The lower end of the support plate 9 is rotatably connected to the movable plate 8 through a pin shaft, and the laser 3 is fixed on the movable plate 8.

[0034] When the angle adjustment mechanism is working, loosen the fastening nut 15, the two locking parts 900 loosen the slide slot seat 10, and then adjust the position of the adjustment bolt 11 on the slide slot 1000. After the adjustment is completed, tighten the fastening nut 15 again to adjust the inclination of the laser 3.

[0035] In this embodiment, the carrier 1 is installed on the end fixture of the three-axis CNC machine tool, the angle adjustment mechanism is adjusted so that the inclination angle between the laser 3 and the powder feeding tube 2 is 30°, the axis of the repaired keyway is adjusted to the clamping position, and the keyway wall is adjusted to be perpendicular to the horizontal plane. The fixed position simultaneously satisfies the parallelism between the keyway wall and the axis of the powder feeding tube 2 and the inclination angle between the laser 3 and the repaired keyway wall is 30°.

[0036] Furthermore, the rotational motion of the laser 3 occurs while the three-axis CNC machine tool is machining the keyway curved wall. When the three-axis CNC machine tool starts the circular interpolation instruction, the axial projection of the optical path of the laser 3 always remains perpendicular to the keyway curved wall.

[0037] See also Figure 5 , a repair method of the laser additive repair device as described above, comprising: Step 1: The CNC machine tool clamps the workpiece 12 so that the repaired wall 1200 is perpendicular to the horizontal plane.

[0038] Step 2, adjust the angle adjustment mechanism to create a suitable inclination angle between the optical path of the laser 3 and the repaired wall 1200 of the workpiece 12.

[0039] Step 3, repairing the repaired wall 1200 of the workpiece 12, the powder feeding pipe 2 feeds powder to the repaired wall 1200 of the workpiece 12, and the laser 3 clads the powder on the repaired wall 1200, specifically including: Step 3.1, when machining the straight wall of the keyway, the rotation of the active gear 7 drives the driven gear 6 to drive the movable turntable 4 to rotate to a suitable position. This position needs to ensure that the axial projection of the optical path of the laser 3 is perpendicular to the keyway wall, the powder feeding tube 2 is close to the wall to be repaired, the optical path of the laser 3 is focused on the innermost layer of the keyway wall, and the three-axis CNC machine tool controls the laser additive repair device to machine at a uniform speed in the same direction to the junction of the straight wall of the keyway and the curved wall of the keyway.

[0040] Step 3.2, when the straight wall of the keyway is processed and the keyway curved wall area is reached, the Z-axis height of the laser additive repair device is kept unchanged, and the rotation speed of the driving gear 7 is adjusted so that when the three-axis CNC machine tool starts the circular interpolation instruction, the axial projection of the laser 3 light path is always perpendicular to the keyway curved wall and the powder feeding tube 2 is close to the keyway curved wall to be repaired, until the current keyway curved wall is processed and the next keyway straight wall to be processed is reached.

[0041] Step 3.3, repair one layer of the keyway wall. At this time, control the three-axis CNC machine tool to raise the Z-axis height of the laser additive repair device. The height is (1-overlap rate) * laser spot diameter. Repeat steps 3.1 and 3.2 until the repair of all shaft keyway walls is completed.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A laser additive repair device suitable for shaft keyways, characterized in that: include: A carrier (1), wherein the carrier (1) is used to be connected to a numerically controlled machine tool; A powder delivery pipe (2), the powder delivery pipe (2) being arranged on the carrier (1) and used for delivering powder to the repaired wall (1200) of the workpiece (12); A laser (3), the laser (3) being arranged obliquely on the carrier (1) and used for cladding powder on the repaired wall (1200) of the workpiece (12); as well as A horizontal rotating mechanism is arranged on the carrier (1) and is used to drive the laser (3) to rotate with the vertical line where the powder outlet of the powder delivery pipe (2) is located as the axis.

2. The laser additive repair device for shaft keyway according to claim 1, characterized in that: The powder delivery pipe (2) is a straight pipe and is vertically arranged on the carrier (1).

3. The laser additive repair device for shaft keyway according to claim 1, characterized in that: The horizontal rotation mechanism comprises a horizontal rotation drive assembly and a movable turntable (4); the movable turntable (4) is rotatably mounted on the carrier (1), and its rotation axis is a vertical line; the laser (3) is obliquely arranged on the movable turntable (4); and the horizontal rotation drive assembly is arranged on the carrier (1) and drives the movable turntable (4) to rotate.

4. The laser additive repair device for shaft keyway according to claim 3, characterized in that: The horizontal rotation driving assembly comprises a motor (5), a driving gear (7) and a driven gear (6); the motor (5) is arranged on the carrier (1); the driving gear (7) is connected to the output shaft of the motor (5); the driven gear (6) is sleeved on the movable turntable (4); and the driving gear (7) meshes with the driven gear (6).

5. The laser additive repair device for shaft keyway according to claim 3, characterized in that: The laser (3) is located at the lower end of the movable turntable (4).

6. The laser additive repair device for shaft keyway according to claim 3, characterized in that: The movable turntable (4) is rotatably sleeved outside the powder delivery pipe (2).

7. The laser additive repair device for shaft keyway according to claim 3, characterized in that: It also comprises an angle adjustment mechanism, wherein the angle adjustment mechanism is used to adjust the inclination of the laser (3).

8. The laser additive repair device for shaft keyway according to claim 7, characterized in that: The angle adjustment mechanism comprises a movable plate (8) and a support plate (9); the movable plate (8) is used to mount the laser (3); one end of the movable plate (8) is rotatably connected to the movable turntable (4); the other end of the movable plate (8) is rotatably connected to one end of the support plate (9); and the other end of the support plate (9) is horizontally slidably connected to the movable turntable (4).

9. The laser additive repair device for shaft keyway according to claim 8, characterized in that: The angle adjustment mechanism further comprises a slide groove seat (10) connected to the movable turntable (4), a slide groove (1000) being horizontally arranged on the slide groove seat (10), two locking parts (900) being arranged opposite to each other at the upper end of the support plate (9), the two locking parts (900) being located on both sides of the slide groove (1000), an adjusting bolt (11) being passed through the two locking parts (900), the adjusting bolt (11) being slidably matched with the slide groove (1000), one end of the adjusting bolt (11) being threadedly connected to a fastening nut (15), and the fastening nut (15) locking the two locking parts (900) on the slide groove seat (10).

10. A repair method for a laser additive repair device as claimed in any one of claims 7 to 9, characterized in that: include: Step 1, clamping the workpiece (12); Step 2, adjusting the angle adjustment mechanism so that a suitable inclination angle is generated between the optical path of the laser (3) and the repaired wall (1200) of the workpiece (12); Step 3, repairing the repaired wall (1200) of the workpiece (12), the powder feeding tube (2) feeding powder to the repaired wall (1200) of the workpiece (12), the laser (3) cladding the powder on the repaired wall (1200), when processing the straight surface of the keyway wall, the axial projection of the optical path of the laser (3) is perpendicular to the straight surface of the keyway wall, and processing is performed layer by layer from the inside to the outside; when processing the curved surface of the keyway wall, the horizontal rotation mechanism is adjusted in real time so that the axial projection of the optical path of the laser (3) is always perpendicular to the curved surface of the keyway wall.

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