A laser shock peening device and method for controlling deformation of a blade

Abstract

The application discloses a laser shock peening device and method for controlling deformation of a blade, which comprises a main body, a special fixture, a supporting assembly and a locking assembly, a vertical plate and a positioning plate, the positioning plate comprises an upper positioning plate and a lower positioning plate, positioning holes are formed in the upper positioning plate and the lower positioning plate, the positioning holes in the upper positioning plate and the lower positioning plate are kept in alignment and are arranged in a matrix, the lower fixture is provided with a groove, a tenon of the blade is placed in the groove, a cover plate is fastened by using a bolt, and the blade is fixed by pressing; a supporting rod is placed in the positioning hole, the main body is turned over by using a mechanical arm after the blade is fixed by the special fixture, and a plurality of supporting rods are inserted into the positioning hole from above; under the action of gravity, the round head part of the supporting rod realizes point contact with a blade crown, and the profiling operation on the blade crown is completed. The application can effectively reduce the bending moment of the blade in the laser shock process, thereby inhibiting the bending deformation of the blade and guaranteeing the structural integrity of the blade.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser shock peening, in particular to a laser shock peening device and method for controlling deformation of a blade. BACKGROUND

[0002] Blade parts are widely used in the field of aero-engines, and generally have the characteristics of complex structure, poor rigidity, high precision requirements, etc. Laser shock peening is a new type of material surface strengthening technology, which can obtain a high-amplitude residual compressive stress layer on the surface of a metal part, greatly improving the fatigue life of the part. Compared with traditional mechanical shot peening technology, the residual compressive stress layer is deeper. In the early 21st century, the United States applied laser shock peening technology to the strengthening and remanufacturing of F101, F119 and F414 engine blades.

[0003] However, due to the characteristics of the blade having a large length-thickness ratio, there are still great difficulties in the process of laser shock peening. For example, after fixing one end of the blade, laser shock peening of the blade will produce a large bending moment, and the bending moment increases with the distance between the impact point and the fixed end. If the blade itself is not rigid, bending deformation will occur under the action of the bending moment, affecting the forming quality of the blade. On the other hand, the distance between the bent blade and the laser focusing lens will change, resulting in uneven distribution of residual stress induced by laser shock on the surface of the blade. SUMMARY

[0004] To solve the above technical problems, a laser shock peening device and method for controlling deformation of a blade are provided, and the specific technical solutions are as follows:

[0005] A laser shock peening device for controlling deformation of a blade, comprising a main body, a special fixture, a support rod and a locking assembly;

[0006] The main body comprises a vertical plate and a positioning plate;

[0007] The positioning plate comprises an upper positioning plate and a lower positioning plate;

[0008] Positioning holes are formed in the upper positioning plate and the lower positioning plate;

[0009] The special fixture comprises a cover plate and a lower clamp;

[0010] The locking assembly comprises a restraining plate and a locking bolt;

[0011] The special fixture is fixed on the vertical plate by bolts;

[0012] The positioning holes are arranged in a matrix, and the positioning holes in the upper positioning plate and the lower positioning plate are aligned;

[0013] The lower clamp is provided with a groove for clamping the tenon part of the blade;

[0014] The cover plate is used for the pressing and fixing of the tenon part, is arranged on the lower clamp, and is locked by a bolt;

[0015] The support rod is sequentially inserted into the positioning hole of the upper positioning plate, the mounting hole of the constraint plate, and the positioning hole of the lower positioning plate; the support rod is used for supporting the blade crown part of the blade;

[0016] The constraint plate is arranged between the upper positioning plate and the lower positioning plate, and the mounting hole is arranged on the surface of the constraint plate;

[0017] The side plates are arranged on the left and right sides of the main body, and the side plates are fixed on the main body by bolts;

[0018] The tail plate is arranged at the rear end of the main body, and the tail plate is fixed on the main body by bolts;

[0019] The locking bolt is threadedly connected with the constraint plate through the light hole of the tail plate, and the constraint plate can move left and right under the rotation of the locking bolt.

[0020] In the preferred embodiment of the laser shock peening device for controlling the deformation of the blade, the material of the support rod is high-elastic rubber, and the top end is treated as a round head.

[0021] In the preferred embodiment of the laser shock peening device for controlling the deformation of the blade, the groove shape of the lower clamp is consistent with the shape of the tenon part of the blade.

[0022] In the preferred embodiment of the laser shock peening device for controlling the deformation of the blade, the number of the positioning holes is several, and the diameter and spacing of the mounting holes arranged on the surface of the constraint plate are consistent with the positioning holes on the upper positioning plate and the lower positioning plate.

[0023] In the preferred embodiment of the laser shock peening device for controlling the deformation of the blade, the number of the support rods is arranged according to the blade crown part.

[0024] A strengthening method applied to the laser shock peening device for controlling the deformation of the blade, and the steps are as follows:

[0025] Step 1: Install the tenon part of the blade 5 in the groove of the special clamp;

[0026] Step 2: Turn over the device main body by using a mechanical arm;

[0027] Step 3: Insert the support rod into the positioning hole from above, and under the action of gravity, the round head part of the support rod realizes point contact with the blade crown part, and the profiling work of the blade crown part is completed;

[0028] Step four: after the profiling work is completed, rotate the locking bolt; the constraint plate slides under the traction of the locking bolt, and the support rod is locked in position, realizing permanent retention of the profiled structure.

[0029] Step five: adjust the laser shock strengthening parameters and perform the strengthening process.

[0030] The beneficial effects of the present application are:

[0031] The technical solution of the present application solves the problem of excessive length of the force arm and bending deformation caused by the existing blade two-end clamping method during laser shock. The device uses a plurality of support rods as a force-bearing structure, which can effectively disperse the impact force at the light spot, reduce the force arm and inhibit deformation; it can also effectively and flexibly meet the profiling requirements of different blade surface characteristics, realizing uniform contact of the blade surface. The technical solution of the present application can effectively inhibit the deformation behavior of the blade during laser shock. By using a plurality of support rods, the profiling work of the blade crown surface characteristics can be simply and effectively completed; during the laser shock strengthening process, the impact force at the light spot is dispersed to the plurality of support rods, effectively reducing the length of the force arm at the light spot and the bending moment, thereby inhibiting the bending deformation of the blade. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a laser shock strengthening device for controlling blade deformation.

[0033] Figure 2 It is a longitudinal sectional view of a laser shock strengthening device for controlling blade deformation.

[0034] Figure 3 It is a transverse sectional view of a laser shock strengthening device for controlling blade deformation.

[0035] Figure 4 It is a flowchart of a laser shock strengthening method for controlling blade deformation.

[0036] In the figure: 1-main body, 2-special fixture, 3-support rod, 4-locking device, 5-blade, 11-vertical plate, 12-upper positioning plate, 13-lower positioning plate, 14-positioning hole, 15-side plate, 16-tail plate, 21-cover plate, 22-lower clamp, 23-groove, 41-constraint plate, 42-locking bolt, 43-mounting hole, 51-tang portion, 52-blade crown portion. DETAILED DESCRIPTION

[0037] The present application will be further described below in conjunction with the accompanying drawings and examples. Figures 1-4

[0038] Example 1

[0039] ​A laser shock peening device for controlling blade deformation, comprising a main body 1, a special fixture 2, a support rod 3 and a locking assembly 4;

[0040] The main body 1 comprises a vertical plate 11 and a positioning plate;

[0041] The positioning plate comprises an upper positioning plate 12 and a lower positioning plate 13;

[0042] 42 positioning holes 14 are arranged on the upper positioning plate 12 and the lower positioning plate 13 in a matrix manner;

[0043] The special fixture 2 comprises a cover plate 21 and a lower fixture 22;

[0044] The locking assembly 4 comprises a constraint plate 41 and a locking bolt 42;

[0045] The special fixture is fixed on the vertical plate 11 by bolts;

[0046] The positioning holes 14 are arranged in a matrix manner, and the positioning holes 14 in the upper positioning plate 12 and the lower positioning plate 13 are kept aligned;

[0047] The lower fixture 22 is provided with a groove 23 for clamping a tenon part 51 of a blade;

[0048] The cover plate 21 is used for pressing and fixing the tenon part 51 and is arranged on the lower fixture 22 and locked by bolts;

[0049] The support rod 3 is provided in a number of 15 and sequentially passes through the positioning holes 14 of the upper positioning plate 12, the mounting holes 43 of the constraint plate 41 and is inserted into the positioning holes 14 of the lower positioning plate 13; the support rod is used for supporting a crown part 52 of the blade 5;

[0050] The constraint plate 41 is installed between the upper positioning plate 12 and the lower positioning plate 13, and the mounting holes 43 are arranged on the surface of the constraint plate 41;

[0051] Side plates 15 are installed on the left and right sides of the main body 1 and are fixed on the main body 1 by bolts;

[0052] A tail plate 16 is installed at the rear end of the main body 1 and is fixed on the main body 1 by bolts;

[0053] The locking bolt 42 is threadedly connected with the constraint plate 41 through a light hole of the tail plate 16, and the constraint plate 41 can move left and right under the rotation of the locking bolt 42.

[0054] The material of the support rod 3 is high-elastic rubber, and the top end is rounded.

[0055] The shape of the groove 23 of the lower fixture 22 is consistent with the shape of the tenon part 51 of the blade.

[0056] The diameter and spacing of the mounting holes 43 opened on the surface of the constraint plate 41 are consistent with the positioning holes 14 on the upper positioning plate 12 and the lower positioning plate 13.

[0057] A reinforcing method applied to a laser shock peening device for controlling deformation of a blade, the steps being as follows:

[0058] Step one: install the tenon part 51 of the blade 5 in the groove 23 of the special fixture 2;

[0059] Step two: use the mechanical arm overturning device main body 1;

[0060] Step three: insert the support rod 3 into the positioning hole 14 from above, under the action of gravity, the round head part of the support rod 3 realizes point contact with the blade crown part 52 of the blade 5, completing the profiling work of the blade crown part 52;

[0061] Step four: after the profiling work is completed, rotate the locking bolt 42; the constraint plate 41 slides under the traction of the locking bolt 42, and the support rod 3 is locked out of position, realizing permanent retention of the profiling structure.

[0062] Step five: adjust the laser shock peening parameters and perform the peening process.

Claims

1. A strengthening method for a laser shock strengthening device for controlling blade deformation, characterized in that: The steps are as follows: Step 1: Install the tenon part of the blade into the groove of the special clamp; Step 2: Use a robotic arm to flip the main body of the device; Step 3: Insert the support rod into the positioning hole from above. Under the action of gravity, the rounded part of the support rod makes point contact with the crown part of the blade, thus completing the contouring of the crown part. Step 4: After the contouring work is completed, rotate the locking bolt; the constraint plate slides under the pull of the locking bolt, misaligning and locking the support rod, thus permanently maintaining the contouring structure; Step 5: Adjust the laser shock peening parameters and carry out the peening process; The reinforcement device includes a main body, a special clamp, a support rod, and a locking assembly; The main body includes a vertical plate and a positioning plate; The positioning plate includes an upper positioning plate and a lower positioning plate; Both the upper and lower positioning plates have positioning holes. The special fixture includes a cover plate and a lower fixture; The locking assembly includes a constraint plate and locking bolts; The special clamp is fixed to the vertical plate by bolts; The positioning holes are arranged in a matrix, and the positioning holes in the upper and lower positioning plates are aligned. The lower clamp has a groove for clamping the tenon part of the blade; The cover plate is used to press and fix the tenon part, and is set on the lower clamp and locked by bolts; The support rod passes sequentially through the positioning hole of the upper positioning plate, the mounting hole of the constraint plate, and is inserted into the positioning hole of the lower positioning plate; the support rod is used to support the crown part of the blade; The constraint plate is installed between the upper positioning plate and the lower positioning plate, and mounting holes are provided on the surface of the constraint plate; Side plates are installed on the left and right sides of the main body and fixed to the main body with bolts; Install a tail plate at the rear end of the main body and fix the tail plate to the main body with bolts; The locking bolt passes through the light hole in the tail plate and is threadedly connected to the constraint plate, and the constraint plate can move left and right under the rotation of the locking bolt.

2. The strengthening method of the laser shock strengthening device for controlling blade deformation according to claim 1, characterized in that: The support rod is made of high-elastic rubber and has a rounded top.

3. The strengthening method of the laser shock strengthening device for controlling blade deformation according to claim 1, characterized in that: The groove shape of the lower clamp is consistent with the shape of the tenon part of the blade.

4. The strengthening method of the laser shock strengthening device for controlling blade deformation according to claim 1, characterized in that: The number of positioning holes is set to several, and the diameter and spacing of the mounting holes on the surface of the constraint plate are consistent with the positioning holes on the upper and lower positioning plates.

5. The strengthening method of the laser shock strengthening device for controlling blade deformation according to claim 1, characterized in that: The number of support rods is set according to the leaf crown portion.

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