CN113732315B - Fixed leveling method for repairing turbine blade by SLM - Google Patents

Abstract

The invention discloses a fixed leveling device and method for SLM repair of turbine blades; it includes a blade clamping mechanism, a first angle adjustment mechanism and a second angle adjustment mechanism; the device has two mutually orthogonal rotational degrees of freedom , which can clamp the turbine blade and adjust its attitude in two mutually orthogonal directions. The device converts a larger amount of rotation into a smaller amount of rotation through the transmission structure, which can realize fine angle adjustment; moreover, it has a scale mark to realize quantitative angle adjustment. The invention has a simple structure, is easy to operate and disassemble, and can realize the clamping and posture adjustment of the turbine blades conveniently and quickly.

Description

A fixed leveling method for SLM repair of turbine blades

Technical field

The present invention relates to a fixed leveling device applied to SLM, and in particular to a fixed leveling device and method for SLM repairing turbine blades.

Background technique

Turbine blades are key components of aeroengines and generally have complex shapes and delicate internal cooling duct structures. Turbine blades work in a harsh environment of high temperature and high speed, so they are prone to wear, defects, cracks and other problems, which in turn affect the normal operation of the aeroengine. Turbine blades with complex inner cavity structures are expensive to manufacture, so damaged blades are usually repaired and reused.

Damaged turbine blades can be repaired through selective laser melting (SLM) technology.

SLM is a metal additive manufacturing technology with great industrialization value, which can directly form nearly completely dense and complex structural parts. However, SLM works based on the principle of powder bed fusion. Therefore, when using SLM technology to repair turbine blades, a fixed leveling device is required to adjust the repair overlap surface of the turbine blade to be level with the horizontal plane and then fix it to facilitate SLM. repair.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned shortcomings and deficiencies of the prior art and provide a fixed leveling device and method for SLM repair of turbine blades. This fixed leveling device can clamp the turbine blade in the forming cavity of the SLM equipment, and adjust the posture of the turbine blade conveniently and finely to ensure that the repair overlap surface is level with the horizontal plane (or the powder spreading plane), so that the SLM equipment can The powder was spread smoothly as usual and the turbine blades were repaired.

The present invention is realized through the following technical solutions:

A fixed leveling device for SLM repair of turbine blades, including a blade clamping mechanism 1, a first angle adjustment mechanism 2 and a second angle adjustment mechanism 3 connected in sequence from top to bottom;

The blade clamping mechanism 1 includes: a first platform 101 and four movable clamping mechanisms 102 symmetrically arranged on the first platform 101; the movable clamping mechanisms 102 are used to clamp the tenon root of the turbine blade 4;

Each movable clamping mechanism 102 includes: two screws 1021 and vertical movement guide blocks 1023;

Two screws 1021 are spaced vertically on the first platform 101, and the vertical movement guide blocks 1023 are sleeved on the screws 1021 through the guide holes 1023a at both ends;

On one side of the vertical movement guide block 1023, a transverse groove rail 1023b is provided, and a transverse movement clamping block 1024 is provided in the transverse groove rail 1023b;

There is a through-threaded hole in the middle of the vertical movement guide block 1023, and an adjustment jackscrew 1025 that offsets the transverse movement clamp block 1024 is installed in the threaded hole; twist the adjustment jackscrew 1025 to change the horizontal movement of the transverse movement clamp block 1024. The length of the groove rail 1023b;

On each screw rod 1021, two limit nuts 1022 are respectively installed to clamp the vertical movement guide block 1023 therebetween; the limit nuts 1022 are used to adjust the position of the vertical movement guide block 1023 on the screw rod 1021;

The four movable clamping mechanisms 102 are symmetrically distributed in a square shape; the four transverse movement clamping blocks 1024 are divided into two groups, two of each group are opposite to each other. Through the relative movement of the four transverse movement clamping blocks 1024, the turbine blades 4 The root of the tenon is clamped in it.

The first angle adjustment mechanism 2 includes: a second platform 202 and a parallelogram mechanism 201 provided on the second platform 202;

The parallelogram mechanism 201 includes: four chute seats 203, a first slide block 204, a first screw rod 205, a guide rail 202a, a first bearing seat 206, a lower connecting rod 2013, an intermediate connecting rod 2012, and an upper connecting rod 2011. , rocker 2014;

The four chute seats 203 are rectangularly distributed and symmetrically arranged on the second platform 202;

The guide rail 202a is located on the second platform 202 in the middle of the four chute seats 203; the first slide block 204 is slidingly connected to the guide rail 202a; the first screw rod 205 is threadedly matched with the first slide block 204; Both ends of the first screw rod 205 are provided on the second platform 202 through the first bearing seat 206;

The lower link 2013 and the upper link 2011 are parallel to each other;

There are two lower connecting rods 2013, arranged parallel to each other; there are two upper connecting rods 2011, arranged parallel to each other;

The lower connecting rod 2013 is fixedly connected to the first slider 204 through bolts;

The lower end of the rocker 2014 and the middle part of the lower link 2013 are hingedly connected through a rotating shaft;

The middle part of the rocker 2014 and the middle part of the upper link 2011 are hingedly connected through a rotating shaft;

The two ends of the lower link 2013 and the upper link 2011 are respectively rotationally connected to the two ends of the middle link 2012 through a rotating shaft;

The four ends of the upper connecting rod 2011 are respectively slidably connected to the four vertical chute of the four chute seats 203 through the rotating shaft;

One end of the first screw rod 205 is equipped with a first knob 208 through a first coupling 207;

When the first knob 208 is turned, the first screw rod 205 rotates accordingly, driving the first slider 204 to move along the guide rail 202a;

When the first slider 204 moves, the lower link 2013 connected to it moves accordingly, driving the rocker 2014 to rotate around the axis of rotation in the middle of the upper link 2011; the upper link 2011 and the rocker 2014 are connected The axis of the rotating shaft serves as the first axis of the first angle adjustment mechanism 2;

By reading the mark line 204a on the first slider 204 and the corresponding scale 202b on the second platform 202, the angle between the upper platform 2015 of the current rocker 2014 and the plane of the second platform 202 can be known .

Two mutually parallel upper links 2011 are provided with fixing bolts 2016; when the rocker 2014 and the upper link 2011 make relative movements, the fixing bolts 2016 are in a loose state; when the rocker 2014 needs to be positioned, lock the fixation Bolt 2016, due to the clamping torque at this time, the rocker 2014 and the upper link 2011 are locked.

The second angle adjustment mechanism 3 includes: a third platform 310; a screw slider mechanism and a semicircular rotating body mechanism are provided on the third platform 310; the semicircular rotating body mechanism is located on one side of the screw slider mechanism and consists of The screw slider mechanism drives its movement;

The semi-circular arc swivel mechanism includes a semi-circular arc trough base 302 and a semi-circular arc swivel 301; the semi-circular arc trough base 302 is fixed on the third platform 310, and the semi-circular arc swivel 301 is located in a semi-circular arc swivel. In the arc groove of the arc groove base 302; the semi-circular arc swivel 301 and the semi-circular arc groove base 302 form a rotation pair; the semi-circular arc swivel 301 rotates around the central axis of its arc, and the central axis serves as the third the second axis of the second angle adjustment mechanism 3;

The top of the semi-arc rotating body 301 has a flat surface, which is used to be fixedly connected to the bottom surface of the second platform 202 of the first angle adjustment mechanism 2;

The side end surface of the semi-circular arc rotor 301 is provided with a guide rod 301a; the screw slider mechanism includes a second slider 305, and the second slider 305 has a vertical guide groove 305b; the guide rod 301a Located in the vertical guide groove 305b;

When the second slider 305 moves linearly, the guide rod 301a moves linearly up and down in the vertical guide groove 305b. The guide rod 301a drives the semi-circular arc rotating body 301 to make an arc along the arc trajectory of the semi-circular arc groove base 302. sports.

The screw slider mechanism also includes a linear guide rail 310a and a screw rod 306; the second slider 305 slides with the linear guide rail 310a; both ends of the screw rod 306 are fixed to the third platform 310 through bearing seats; A knob 309 is installed at the end of the screw rod 306; scale marks 305a are respectively provided at the intersection of the second slider 305 and the third platform 310;

When the knob 309 is turned, the screw rod 306 rotates accordingly, driving the second slider 305 to move along the linear track of the linear guide rail 310a, and driving the semi-circular arc rotating body 301 to rotate around the second axis through the guide rod 301a; by reading the first The angle between the top plane of the current semi-circular arc rotating body 301 and the plane of the third platform 310 can be known from the scale value of the scale mark 305a on the second slider 305.

The side wall of the semi-circular arc groove base 302 is provided with a threaded hole 302a penetrating the wall. A fastening screw 303 is installed in the threaded hole 302a; when the fastening screw 303 is tightened, it is used to resist the semi-circular arc rotating body 301 Prevent it from moving on the semicircular arc groove base 302.

The semi-circular arc groove of the semi-circular arc groove base 302 is a dovetail groove, and the structure of the semi-circular arc swivel 301 is corresponding thereto;

The joint surface of the semi-circular arc groove base 302 and the semi-circular arc rotating body 301 is a dovetail groove structure.

The guide rod 301a is covered with a bearing 304, and the bearing 304 is located in the vertical guide groove 305b.

A fixing and leveling method during SLM repair of turbine blades, which includes the following steps:

(1) Conduct a three-dimensional scan of the pre-repaired turbine blade 4 to obtain its three-dimensional model; in the three-dimensional modeling software, make the repair overlap surface of the three-dimensional model of the turbine blade 4 parallel to the horizontal plane, measure its coordinate system, and match it with the SLM equipment The angle between the coordinate systems of the powder spreading working platform of the molding cavity 5 is obtained, and the angles θ _x and θ _y that need to be rotated around the x and y axes of the powder spreading working platform coordinate system are obtained;

(2) Raise the forming cylinder 502 in the forming cavity 5 of the SLM equipment to the powder spreading plane; install and fix the third platform 310 on the forming cylinder 502 in the forming cavity 5 of the SLM equipment, and ensure that the second axis is in line with the position in step 1 The x-axis is parallel, and the first axis is parallel to the y-axis in step 1;

(3) Turn the knob 309 so that the scale mark 305a on the second slider 305 returns to zero. At this time, the second platform 202 is parallel to the horizontal plane;

(4) Turn the first knob 208 so that the marking line 204a on the first slider 204 returns to the zero position of the scale value on the second platform 202. At this time, the first platform 101 is parallel to the horizontal plane;

(5) Fix the turbine blade 4 on the movable clamping mechanism 102 of the first platform 101: Place the tenon root of the turbine blade 4 at the clamping station of the movable clamping mechanism 102, and adjust the limit nut 1022 to vertically Move the movement guide block 1023 to a height that is conducive to clamping the tenon root of the turbine blade 4; rotate and adjust the top screw 1025 to make the four transverse movement clamping blocks 1024 of the movable clamping mechanism 102 move relative to clamp the tenon root of the turbine blade 4 ;

(6) Turn the knob 309 on the third platform 310 to rotate the turbine blade 4 around the second axis, and adjust the scale value of the scale mark 305a on the third platform 310 to the angle θ _x in step 1; lock it tightly Fasten the screws 303 to prevent the second platform 202 on it from shaking;

(7) Turn the first knob 208 of the second platform 202 to rotate the turbine blade 4 around the first axis, and adjust the scale value of the scale 202b of the second platform 202 to the angle θ _y in step 1; lock it Fix the bolts 2016 to prevent the first platform 101 on it from shaking; at this time, the repair overlap surface of the turbine blade 4 is parallel to the horizontal plane;

(8) Lower the forming cylinder 502 in the forming cavity 5 of the SLM equipment, and adjust the repair overlap surface of the turbine blade 4 to a position flush with the powder spreading plane, so that the powder spreading roller 501 is in a state where it can reciprocate and spread powder; complete the turbine The blades are fixed and leveled during the SLM repair process; the subsequent SLM repair work of turbine blade 4 can be carried out.

The pre-repair treatment of the turbine blade 4 in step (1), wherein the pre-repair treatment refers to polishing the parts of the turbine blade 4 to be repaired.

Compared with the existing technology, the present invention has the following advantages and effects:

The four movable clamping mechanisms of the present invention are symmetrically distributed in a square shape; the four transverse movement clamping blocks are divided into two groups, two of each group are opposite to each other. Through the relative movement of the four transverse movement clamping blocks, the tenon root of the turbine blade is Clamped in it; this mouth-shaped clamping structure has a stable physical structure and effectively prevents the turbine blades from deflecting or moving during the SLM repair process.

In the movable clamping mechanism of the present invention, two limit nuts are installed on each screw rod to clamp the vertical movement guide block between them; the limit nut is used to adjust the position of the vertical movement guide block on the screw rod; This structure can easily adjust the height of the transverse movement clamping block, so that it can resist the tenon root of the turbine blade in a regular position and improve the clamping stability.

The parallelogram mechanism of the present invention includes: four chute seats, a first slide block, a first screw rod, a guide rail, a first bearing seat, a lower connecting rod, an intermediate connecting rod, an upper connecting rod, a rocker and other component combinations; this kind of The structural combination is not only simple in structure, but also flexible and stable in physical structure, and also enhances the accuracy of the rotating pair. Four chute seats are rectangularly distributed and symmetrically arranged on the second platform; the guide rail is located on the second platform in the middle of the four chute seats; the first slide block is slidingly connected to the guide rail; the first screw rod is The first slider is threaded; the two ends of the first screw rod are arranged on the second platform through the first bearing seat; the lower connecting rod and the upper connecting rod are parallel to each other; there are two lower connecting rods, parallel to each other Setting; there are two upper connecting rods, set parallel to each other; with this structural design, when the first knob is turned, the first screw rod rotates accordingly, driving the first slider to move along the guide rail; when the first slider moves , the lower link connected to it moves accordingly, driving the rocker to rotate around the rotating shaft in the middle of the upper link; the axis of the rotating shaft connected between the upper link and the rocker serves as the first angle adjustment mechanism axis; by reading the mark line on the first slider and the corresponding scale on the second platform, the angle between the current upper platform of the rocker and the plane of the second platform can be known.

The semicircular swivel mechanism of the present invention includes a semicircular arc trough base and a semicircular arc swivel; the semicircular arc trough base is fixed on the third platform, and the semicircular arc swivel is located on the semicircular arc trough base. In the arc groove; the semi-circular arc rotary body and the semi-circular arc groove base form a rotation pair; the semi-circular arc rotary body rotates around the central axis of its arc, and the central axis serves as the second axis of the second angle adjustment mechanism; The second axis is orthogonal to the first axis. The structural combination of semi-circular arc groove base and semi-circular arc swivel allows for more precise adjustment of the required angle, and the physical structure is stable and flexible. When the second slider moves linearly, the guide rod moves linearly up and down in the vertical guide groove, and the guide rod drives the semi-circular arc rotating body to move in an arc along the arc trajectory of the semi-circular arc groove base. When the knob is turned, the screw rod rotates accordingly, driving the second slider to move along the linear track of the linear guide rail, and driving the semi-circular arc rotor to rotate around the second axis through the guide rod; by reading the scale on the second slider The marked scale value can be used to know the angle between the top plane of the current semicircular arc swivel and the third platform plane.

The fixed leveling device of the present invention has two mutually orthogonal rotational degrees of freedom because the first axis and the second axis are orthogonal (that is, perpendicular to each other). In the angle adjustment process, the angles of the first angle adjustment mechanism and the second angle adjustment mechanism can be quantitatively adjusted, and the repaired overlap surface of the turbine blade can be quickly adjusted to the required angle.

The fixed leveling device of the present invention uses the structural principle of the screw rod to convert a larger amount of rotation into a smaller amount of movement, and then converts the smaller amount of movement into a smaller amount of rotation, which greatly improves the precise adjustment of multi-directional and subtle angles.

Description of the drawings

Figure 1 is a schematic diagram of the application of the fixed leveling device of the present invention in the SLM repair process of turbine blades.

Figure 2 is a schematic diagram of the assembly structure of the fixed leveling device of the present invention.

Figure 3 is a schematic structural diagram of the blade clamping mechanism in Figure 2.

Figure 4 is a schematic structural diagram of the movable clamping mechanism in Figure 3.

FIG. 5 is a schematic structural diagram of the first angle adjustment mechanism in FIG. 2 .

FIG. 6 is an exploded view of the parallelogram mechanism in FIG. 5 .

FIG. 7 is an exploded view of the second angle adjustment mechanism in FIG. 2 .

Detailed ways

The present invention will be further described in detail below with reference to specific embodiments.

As shown in Figure 1-7. The invention discloses a fixed leveling device for SLM repair of turbine blades, which includes a blade clamping mechanism 1, a first angle adjustment mechanism 2 and a second angle adjustment mechanism 3 connected in sequence from top to bottom;

The blade clamping mechanism 1 includes: a first platform 101 and four movable clamping mechanisms 102 symmetrically arranged on the first platform 101; the movable clamping mechanisms 102 are used to clamp the tenon root of the turbine blade 4;

Each movable clamping mechanism 102 includes: two screws 1021 and vertical movement guide blocks 1023;

Two screws 1021 are spaced vertically on the first platform 101, and the vertical movement guide blocks 1023 are sleeved on the screws 1021 through the guide holes 1023a at both ends;

On one side of the vertical movement guide block 1023, a transverse groove rail 1023b is provided, and a transverse movement clamping block 1024 is provided in the transverse groove rail 1023b;

There is a through-threaded hole in the middle of the vertical movement guide block 1023, and an adjustment jackscrew 1025 that offsets the transverse movement clamp block 1024 is installed in the threaded hole; twist the adjustment bolt to change the transverse movement clamp block 1024 to extend out of the transverse groove rail The length of 1023b;

On each screw rod 1021, two limit nuts 1022 are respectively installed to clamp the vertical movement guide block 1023 therebetween; the limit nuts 1022 are used to adjust the position of the vertical movement guide block 1023 on the screw rod 1021;

The four movable clamping mechanisms 102 are symmetrically distributed in a cross-shaped manner; the four transverse movement clamping blocks 1024 are divided into two groups, two of each group are opposite to each other. Through the relative movement of the four transverse movement clamping blocks 1024 (cross-shaped movement) locus), clamping the tenon root of the turbine blade 4 therein. This four-direction clamping torque enables the turbine blade 4 to be more firmly fixed on the movable clamping mechanism 102, which is beneficial to improving the accuracy of the parts to be repaired.

The first angle adjustment mechanism 2 includes: a second platform 202 and a parallelogram mechanism 201 provided on the second platform 202;

The parallelogram mechanism 201 includes: four chute seats 203, a first slide block 204, a first screw rod 205, a guide rail 202a, a first bearing seat 206, a lower connecting rod 2013, an intermediate connecting rod 2012, and an upper connecting rod 2011. , rocker 2014;

The four chute seats 203 are rectangularly distributed and symmetrically arranged on the second platform 202;

The guide rail 202a is located on the second platform 202 in the middle of the four chute seats 203; the first slide block 204 is slidingly connected to the guide rail 202a; the first screw rod 205 is threadedly matched with the first slide block 204; Both ends of the first screw rod 205 are provided on the second platform 202 through the first bearing seat 206;

The lower link 2013 and the upper link 2011 are parallel to each other;

There are two lower connecting rods 2013, arranged parallel to each other; there are two upper connecting rods 2011, arranged parallel to each other;

The lower connecting rod 2013 is fixedly connected to the first slider 204 through bolts;

The lower end of the rocker 2014 and the middle part of the lower link 2013 are hingedly connected through a rotating shaft;

The middle part of the rocker 2014 and the middle part of the upper link 2011 are hingedly connected through a rotating shaft;

The two ends of the lower link 2013 and the upper link 2011 are respectively rotationally connected to the two ends of the middle link 2012 through a rotating shaft;

The four ends of the upper connecting rod 2011 are respectively slidably connected to the four vertical chute of the four chute seats 203 through the rotating shaft;

One end of the first screw rod 205 is equipped with a first knob 208 through the first coupling 207;

When the first knob 208 is turned, the first screw rod 205 rotates accordingly, driving the first slider 204 to move along the guide rail 202a;

When the first slider 204 moves, the lower link 2013 connected to it moves accordingly, driving the rocker 2014 to rotate around the axis of rotation in the middle of the upper link 2011; the upper link 2011 and the rocker 2014 are connected The axis of the rotating shaft serves as the first axis of the first angle adjustment mechanism 2;

By reading the mark line 204a on the first slider 204 and the corresponding scale 202b on the second platform 202, the angle between the upper platform 2015 of the current rocker 2014 and the plane of the second platform 202 can be known .

Two mutually parallel upper links 2011 are provided with fixing bolts 2016; when the rocker 2014 and the upper link 2011 make relative movements, the fixing bolts 2016 are in a loose state; when the rocker 2014 needs to be positioned, lock the fixation Bolt 2016, due to the clamping torque at this time, the rocker 2014 and the upper link 2011 are locked.

The parallelogram mechanism 201 of the present invention not only has a simple structure, but also has a flexible and stable physical structure, which improves the precision of the rotating pair.

The second angle adjustment mechanism 3 includes: a third platform 310; a screw slider mechanism and a semicircular rotating body mechanism are provided on the third platform 310; the semicircular rotating body mechanism is located on one side of the screw slider mechanism and consists of The screw slider mechanism drives its movement;

The semi-circular arc swivel mechanism includes a semi-circular arc trough base 302 and a semi-circular arc swivel 301; the semi-circular arc trough base 302 is fixed on the third platform 310, and the semi-circular arc swivel 301 is located in a semi-circular arc swivel. In the arc groove of the arc groove base 302; the semi-circular arc swivel 301 and the semi-circular arc groove base 302 form a rotation pair; the semi-circular arc swivel 301 rotates around the central axis of its arc, and the central axis serves as the third the second axis of the second angle adjustment mechanism 3;

The top of the semi-arc rotating body 301 has a flat surface, which is used to be fixedly connected to the bottom surface of the second platform 202 of the first angle adjustment mechanism 2;

The side end surface of the semi-circular arc rotor 301 is provided with a guide rod 301a; the screw slider mechanism includes a second slider 305, and the second slider 305 has a vertical guide groove 305b; the guide rod 301a Located in the vertical guide groove 305b;

When the second slider 305 moves linearly, the guide rod 301a moves linearly up and down in the vertical guide groove 305b. The guide rod 301a drives the semi-circular arc rotating body 301 to make an arc along the arc trajectory of the semi-circular arc groove base 302. sports.

The structural combination of the semi-circular arc groove base 302 and the semi-circular arc swivel 301 of the present invention can more precisely adjust the required angle, and the physical structure is stable and flexible.

The screw slider mechanism also includes a linear guide rail 310a and a screw rod 306; the second slider 305 slides with the linear guide rail 310a; both ends of the screw rod 306 are fixed to the third platform 310 through bearing seats; A knob 309 is installed at the end of the screw rod 306; scale marks 305a are respectively provided at the intersection of the second slider 305 and the third platform 310;

When the knob 309 is turned, the screw rod 306 rotates accordingly, driving the second slider 305 to move along the linear track of the linear guide rail 310a, and driving the semi-circular arc rotating body 301 to rotate around the second axis through the guide rod 301a; by reading the first The angle between the top plane of the current semi-circular arc rotating body 301 and the plane of the third platform 310 can be known from the scale value of the scale mark 305a on the second slider 305.

The side wall of the semi-circular arc groove base 302 is provided with a threaded hole 302a penetrating the wall. A fastening screw 303 is installed in the threaded hole 302a; when the fastening screw 303 is tightened, it is used to resist the semi-circular arc rotating body 301 Prevent it from moving in the semi-arc groove base 302.

The semi-circular arc groove of the semi-circular arc groove base 302 is a dovetail groove, and the structure of the semi-circular arc swivel 301 is corresponding thereto;

The joint surface of the semi-circular arc groove base 302 and the semi-circular arc rotating body 301 is a dovetail groove structure.

The guide rod 301a is covered with a bearing 304, and the bearing 304 is located in the vertical guide groove 305b.

The first angle adjustment mechanism 2 and the second angle adjustment mechanism 3 of the present invention have two mutually orthogonal rotational degrees of freedom, and can clamp the turbine blade 4 and adjust its posture in two mutually orthogonal directions. The device converts a larger amount of rotation into a smaller amount of rotation through the transmission structure (screw transmission principle), which can achieve subtle angle adjustment; through the scale on the device, quantitative angle adjustment can be achieved. The invention is easy to disassemble, has a relatively simple structure and operation, and can easily realize the clamping and posture adjustment of the turbine blades.

During the SLM repair of turbine blades, the turbine blades can be fixed and leveled through the following steps:

(1) Conduct a three-dimensional scan of the pre-repaired turbine blade 4 to obtain its three-dimensional model; in the three-dimensional modeling software, make the repair overlap surface of the three-dimensional model of the turbine blade 4 parallel to the horizontal plane, measure its coordinate system, and match it with the SLM equipment The angle between the coordinate systems of the powder spreading working platform of the molding cavity 5 is obtained, and the angles θ _x and θ _y that need to be rotated around the x and y axes of the powder spreading working platform coordinate system are obtained;

Among them, the pre-repair treatment of the turbine blade 4 refers to polishing the parts of the turbine blade 4 to be repaired.

(2) Raise the forming cylinder 502 in the forming cavity 5 of the SLM equipment to the powder spreading plane; install and fix the third platform 310 on the forming cylinder 502 in the forming cavity 5 of the SLM equipment, and ensure that the second axis is in line with the position in step 1 The x-axis is parallel, and the first axis is parallel to the y-axis in step 1;

(3) Turn the knob 309 so that the scale mark 305a on the second slider 305 returns to zero. At this time, the second platform 202 is parallel to the horizontal plane;

(4) Turn the first knob 208 so that the marking line 204a on the first slider 204 returns to the zero position of the scale value on the second platform 202. At this time, the first platform 101 is parallel to the horizontal plane;

(5) Fix the turbine blade 4 on the movable clamping mechanism 102 of the first platform 101: Place the tenon root of the turbine blade 4 at the clamping station of the movable clamping mechanism 102, and adjust the limit nut 1022 to vertically Move the movement guide block 1023 to a height that is conducive to clamping the tenon root of the turbine blade 4; rotate and adjust the top screw 1025 to make the four transverse movement clamping blocks 1024 of the movable clamping mechanism 102 move relative to clamp the tenon root of the turbine blade 4 ;

(6) Turn the knob 309 on the third platform 310 to rotate the turbine blade 4 around the second axis, and adjust the scale value of the scale mark 305a on the third platform 310 to the angle θ _x in step 1; lock it tightly Fasten the screws 303 to prevent the second platform 202 on it from shaking;

(7) Turn the first knob 208 of the second platform 202 to rotate the turbine blade 4 around the first axis, and adjust the scale value of the scale 202b of the second platform 202 to the angle θ _y in step 1; lock it Fix the bolts 2016 to prevent the first platform 101 on it from shaking; at this time, the repair overlap surface of the turbine blade 4 is parallel to the horizontal plane;

(8) Lower the forming cylinder 502 in the forming cavity 5 of the SLM equipment, and raise the repaired overlap surface of the turbine blade 4 to a position flush with the powder spreading plane, so that the powder spreading roller 501 is in a state where it can reciprocate and spread powder; complete the turbine The blades are fixed and leveled during the SLM repair process; the subsequent SLM repair work of turbine blade 4 can be carried out.

The first angle adjustment mechanism 2 and the second angle adjustment mechanism 3 of the present invention have a first axis and a second axis that are orthogonal to each other, and have two mutually orthogonal rotational degrees of freedom. In the angle adjustment process, the angles of the first angle adjustment mechanism 2 and the second angle adjustment mechanism 3 can be quantitatively adjusted so that the repaired overlap surface of the turbine blade is level with the horizontal plane. Moreover, this device uses the transmission structure of the screw rod principle to convert a larger amount of rotation into a smaller amount of movement, and then converts a smaller amount of movement into a smaller amount of rotation to achieve subtle angle adjustment.

As described above, the present invention can be better implemented.

The implementation of the present invention is not limited to the above-mentioned embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent substitutions and are included in within the protection scope of the present invention.

Claims (4)

1. The fixing and leveling method in the process of repairing the turbine blade by the SLM is characterized by being realized based on a fixing and leveling device for repairing the turbine blade by the SLM;

the fixing and leveling device for repairing the turbine blade by the SLM comprises a blade clamping mechanism (1), a first angle adjusting mechanism (2) and a second angle adjusting mechanism (3) which are sequentially connected from top to bottom; the method is characterized in that:

the blade clamping mechanism (1) comprises: the device comprises a first platform (101) and four movable clamping mechanisms (102) symmetrically arranged on the first platform (101); the movable clamping mechanism (102) is used for clamping the root part of the tenon of the turbine blade (4);

each movable clamping mechanism (102) comprises: two screws (1021) and a vertical movement guide block (1023);

the two screws (1021) are vertically arranged on the first platform (101) at intervals, and the vertical movement guide blocks (1023) are sleeved on the screws (1021) through guide holes (1023 a) at two ends of the vertical movement guide blocks;

a transverse groove rail (1023 b) is arranged on one side of the vertical movement guide block (1023), and a transverse movement clamping block (1024) is arranged in the transverse groove rail (1023 b);

the middle part of the vertical movement guide block (1023) is provided with a threaded hole which is penetrated, and an adjusting jackscrew (1025) which is propped against the transverse movement clamping block (1024) is arranged in the threaded hole; screwing the adjusting jackscrew (1025) to change the length of the transverse movement clamping block (1024) extending out of the transverse groove rail (1023 b);

two limit nuts (1022) for clamping the vertical movement guide blocks (1023) between the two limit nuts are respectively arranged on each screw rod (1021); the limit nut (1022) is used for adjusting the position of the vertical movement guide block (1023) on the screw (1021);

the four movable clamping mechanisms (102) are symmetrically distributed in a shape of a Chinese character 'kou'; the four transverse movement clamping blocks (1024) are divided into two groups, each group is two opposite to each other, and the tenon root parts of the turbine blades (4) are clamped in the four transverse movement clamping blocks (1024) through the relative movement of the four transverse movement clamping blocks;

the first angle adjustment mechanism (2) includes: a second platform (202) and a parallelogram mechanism (201) disposed on the second platform (202);

the parallelogram mechanism (201) comprises: the four sliding groove seats (203), a first sliding block (204), a first screw rod (205), a guide rail (202 a), a first bearing seat (206), a lower connecting rod (2013), a middle connecting rod (2012), an upper connecting rod (2011) and a rocker (2014);

the four chute seats (203) are distributed in a rectangular shape and are symmetrically arranged on the second platform (202);

the guide rail (202 a) is positioned on a second platform (202) in the middle of the four chute seats (203); the first sliding block (204) is in sliding connection with the guide rail (202 a); the first screw rod (205) is in threaded fit with the first sliding block (204); two end parts of the first screw rod (205) are arranged on the second platform (202) through a first bearing seat (206);

the lower connecting rod (2013) is parallel to the upper connecting rod (2011);

the number of the lower connecting rods (2013) is two, and the two lower connecting rods are arranged in parallel; the upper connecting rods (2011) are arranged in parallel;

the lower connecting rod (2013) is fixedly connected with the first sliding block (204) through a bolt;

the lower end of the rocker (2014) is movably hinged with the middle part of the lower connecting rod (2013) through a rotating shaft;

the middle part of the rocker (2014) is movably hinged with the middle part of the upper connecting rod (2011) through a rotating shaft;

two ends of the lower connecting rod (2013) and the upper connecting rod (2011) are respectively connected with two ends of the middle connecting rod (2012) in a rotating way through rotating shafts;

four end parts of the upper connecting rod (2011) are respectively connected with four vertical sliding grooves of four sliding groove seats (203) in a sliding manner through rotating shafts;

one end part of the first screw rod (205) is provided with a first knob (208) through a first coupler (207);

when the first knob (208) is turned, the first screw rod (205) turns along with the first knob, and the first slider (204) is driven to move along the guide rail (202 a);

when the first sliding block (204) moves, the lower connecting rod (2013) connected with the first sliding block moves along with the first sliding block, and the driving rocker (2014) rotates around a rotating shaft at the middle part of the upper connecting rod (2011); the axis of a rotating shaft connected between the upper connecting rod (2011) and the rocker (2014) is used as a first axis of the first angle adjusting mechanism (2);

the included angle between the upper end platform (2015) of the current rocker (2014) and the plane of the second platform (202) can be obtained by reading the mark line (204 a) on the first slider (204) and the graduated scale (202 b) corresponding to the second platform (202);

the second angle adjustment mechanism (3) includes: a third platform (310); a screw rod sliding block mechanism and a semicircular rotating body mechanism are arranged on the third platform (310); the semicircular rotating mechanism is positioned at one side of the screw rod sliding block mechanism and is driven by the screw rod sliding block mechanism to move;

the semicircular rotating body mechanism comprises a semicircular arc groove base (302) and a semicircular arc rotating body (301); the semicircular groove base (302) is fixed on the third platform (310), and the semicircular rotator (301) is positioned in an arc groove of the semicircular groove base (302); the semicircular arc rotator (301) and the semicircular arc groove base (302) form a revolute pair fit; the semicircular arc rotating body (301) rotates around the central axis of the arc, and the central axis is used as a second axis of the second angle adjusting mechanism (3); the second axis is orthogonal to the first axis;

the top of the semicircular arc rotating body (301) is provided with a plane which is used for being fixedly connected with the bottom surface of the second platform (202) of the first angle adjusting mechanism (2);

the side end surface of the semicircular arc rotator (301) is provided with a guide rod (301 a); the screw rod sliding block mechanism comprises a second sliding block (305), and a vertical guide groove (305 b) is formed in the second sliding block (305); the guide rod (301 a) is positioned in the vertical guide groove (305 b);

when the second sliding block (305) moves linearly, the guide rod (301 a) moves linearly up and down in the vertical guide groove (305 b), and the guide rod (301 a) drives the semicircular arc rotating body (301) to move in an arc along the arc track of the semicircular arc groove base (302);

the two upper connecting rods (2011) which are parallel to each other are provided with fixing bolts (2016); when the rocker (2014) and the upper connecting rod (2011) do relative motion, the fixed bolt (2016) is in a loose state; when the rocker (2014) needs to be positioned, the fixing bolt (2016) is locked, and at the moment, the rocker (2014) and the upper connecting rod (2011) are locked due to the clamping moment;

the screw rod sliding block mechanism further comprises a linear guide rail (310 a) and a screw rod (306); the second sliding block (305) is in sliding fit with the linear guide rail (310 a); both ends of the screw rod (306) are fixed with a third platform (310) through bearing seats; a knob (309) is arranged at the end part of the screw rod (306); the intersection of the second sliding block (305) and the third platform (310) is provided with scale marks (305 a) respectively;

when the knob (309) is turned, the screw rod (306) turns along with the knob to drive the second slider (305) to move along the linear track of the linear guide rail (310 a), and the semicircular arc turning body (301) is driven to rotate around the second axis through the guide rod (301 a); the included angle between the top plane of the current semicircular arc rotator (301) and the plane of the third platform (310) can be obtained by reading the scale value of the scale mark (305 a) on the second sliding block (305);

the side wall of the semicircular groove base (302) is provided with a threaded hole (302 a) penetrating through the wall surface, and a fastening screw (303) is arranged in the threaded hole (302 a); when the fastening screw (303) is screwed, the fastening screw is used for propping against the semicircular arc rotator (301) to prevent the semicircular arc rotator from moving on the semicircular arc groove base (302);

the fixing and leveling steps are as follows:

(1) Carrying out three-dimensional scanning on the turbine blade (4) subjected to the pretreatment of repair to obtain a three-dimensional model of the turbine blade; in the three-dimensional modeling software, the repairing overlap surface of the three-dimensional model of the turbine blade (4) is parallel to the horizontal plane, the coordinate system of the repairing overlap surface is measured, and the included angle between the repairing overlap surface and the coordinate system of the powder laying working platform of the SLM equipment forming cavity (5) is obtained, so that the angle required to rotate around the x axis and the y axis of the coordinate system of the powder laying working platform is obtained、/>；

(2) Raising a forming cylinder (502) in a forming cavity (5) of the SLM equipment to a powder spreading plane; mounting and fixing a third platform (310) on a forming cylinder (502) in a forming cavity (5) of the SLM equipment, and ensuring that a second axis is parallel to the x axis in the step (1), and a first axis is parallel to the y axis in the step (1);

(3) Turning the knob (309) so that the scale mark (305 a) on the second slider (305) is zeroed, and the second platform (202) is parallel to the horizontal plane;

(4) Rotating the first knob (208) to enable the mark line (204 a) on the first slider (204) to return to the zero position of the scale value on the second platform (202), and enabling the first platform (101) to be parallel to the horizontal plane;

(5) Fixing the turbine blade (4) on a first platform (101) movable clamping mechanism (102): the tenon root part of the turbine blade (4) is arranged at a clamping station of the movable clamping mechanism (102), and the vertical movement guide block (1023) is moved to the height which is favorable for clamping the tenon root part of the turbine blade (4) by adjusting the limit nut (1022); rotating the adjusting jackscrew (1025) to enable the four transversely moving clamping blocks (1024) of the movable clamping mechanism (102) to move relatively so as to clamp the tenon root of the turbine blade (4);

(6) Turning a knob on a third platform (310)309 Rotating the turbine blade (4) about the second axis to adjust the scale value of the scale mark (305 a) on the third platform (310) to the angle in step (1)The method comprises the steps of carrying out a first treatment on the surface of the Locking the fastening screw (303) to prevent the second platform (202) thereon from shaking;

(7) Rotating a first knob (208) of the second platform (202) to rotate the turbine blade (4) around a first axis, and adjusting the scale value of a scale (202 b) of the second platform (202) to the angle in the step (1)The method comprises the steps of carrying out a first treatment on the surface of the Locking the fixing bolt (2016) to prevent the first platform (101) thereon from shaking; at this time, the repairing overlap surface of the turbine blade (4) is parallel to the horizontal plane;

(8) Lowering a forming cylinder (502) in a forming cavity (5) of the SLM equipment, and raising and adjusting a repairing overlap surface of the turbine blade (4) to a position flush with a powder spreading plane, so that a powder spreading roller (501) is in a state capable of reciprocally running for spreading powder; fixing and leveling the turbine blade in the SLM repairing process is completed; the subsequent SLM repair operation of the turbine blade (4) can be performed.

2. The method of fixing and leveling during SLM repair of turbine blades according to claim 1, characterized in that:

the semicircular groove of the semicircular groove base (302) is a dovetail groove, and the structure of the semicircular rotator (301) corresponds to the dovetail groove;

the joint surface of the semicircular groove base (302) and the semicircular rotator (301) is of a dovetail groove structure.

3. The method of fixing and leveling during SLM repair of turbine blades according to claim 1, characterized in that:

the guide rod (301 a) is sleeved with a bearing (304), and the bearing (304) is positioned in the vertical guide groove (305 b).

4. The method of fixing and leveling during SLM repair of turbine blades according to claim 1, characterized in that:

and (2) performing pretreatment on the turbine blade (4) in the step (1), namely polishing and flattening the part to be repaired of the turbine blade (4).