CN110000583A - A kind of tooling and application method being thinned for steam turbine blade circular arc binding face - Google Patents

Abstract

The invention discloses a tool for thinning the circular-arc abutting surface of a steam turbine rotor blade, which comprises a precision flat jaw, a bottom plate, an inclined iron and a circular arc backing plate; the precision flat jaw is flatly sleeved with a bottom plate; A second groove, a third groove and a fourth groove are horizontally opened from top to bottom in sequence, and the three are arranged side by side; an inclined iron is horizontally arranged in the third groove, and its upper surface is an inclined plane; The upper surface of the inclined iron is also provided with a circular arc backing plate; the lower surface of the bottom plate is vertically provided with a second threaded hole, which is communicated with the third groove, and a third threaded hole is obliquely opened at the lower position of the right outer side wall of the bottom plate. and communicates with the third groove; a fourth threaded hole is inclined at the upper position of the right outer side wall of the bottom plate, and extends to the left out of the left outer side wall of the bottom plate; blades are also provided on the upper surface of the circular arc backing plate, which pass through the bottom plate respectively. The second fastening bolts are pressed against the left and right ends of the blade. The invention can adjust the angle of the blade while fixing the blade, thereby improving the processing efficiency.

Description

A tool for reducing the thickness of the circular arc bonding surface of a steam turbine motor blade and a method of using the same

technical field

The invention relates to the technical field of using a horizontal milling machine to reduce the thickness of the circular arc fitting surface of a steam turbine blade, in particular to a tool for thinning the circular arc fitting surface of a steam turbine motor blade and a method of using the same.

Background technique

During the assembly process of the turbine blades, the blade thickening pieces should be appropriately thinned so that the blades can be installed and there is sufficient tightening force between each blade. For blade thinning with a flat blade contact surface, it only needs to be processed on a grinding machine to complete the blade thinning. However, when the blade contact surface is an arc surface, appropriate tooling must be used to form it on a horizontal milling machine. Milling cutter to complete, the tooling must have the function of fixing the blade and adjusting the angle of the blade radiation.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a tool for thinning the circular arc fitting surface of a steam turbine motor blade and a method of use, which has a compact structure and is easy to operate. Improve processing efficiency.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: a tooling of the present invention for thinning the circular arc fitting surface of a steam turbine rotor blade, the innovation is that it includes a precision flat jaw, a bottom plate, an angle adjustment bolt, a A tightening bolt, a second tightening bolt, an inclined iron, a countersunk head bolt and an arc backing plate; a bottom plate is horizontally sleeved on the upper surface of the precision vise, and the bottom plate is a cuboid structure; The upper surface is horizontally opened with a second groove, a third groove and a fourth groove from top to bottom, and the second groove, the third groove and the fourth groove are all square, and the three are juxtaposed. The inclined iron is horizontally arranged in the third groove, the inclined iron is matched with the third groove, and the upper surface thereof is an inclined surface; the upper surface of the inclined iron is also provided with a circle An arc backing plate, the circular arc backing plate is fixedly connected with the inclined iron through countersunk bolts; a second threaded hole matching the angle adjustment bolt is also vertically arranged on the lower surface of the bottom plate, and the first Two threaded holes are provided on the right side of the precision vise and communicate with the third groove, and the angle adjustment bolts are pressed against the lower surface of the inclined iron through the second threaded holes; on the right outer side wall of the bottom plate The lower position is also provided with a third threaded hole matching the first fastening bolt, and the third threaded hole is communicated with the third groove, and the first fastening bolt passes through the third thread The top of the hole is tightened on the right side wall of the inclined iron; a fourth threaded hole matched with the second fastening bolt is also obliquely opened at the upper position of the right outer side wall of the bottom plate, and the fourth threaded hole It communicates with the second groove and extends to the left of the left outer side wall of the bottom plate; there are also blades on the upper surface of the circular arc backing plate, and the second fastening bolts pass through the left and right sides of the bottom plate respectively. The fourth threaded hole on the side is tight on the left and right ends of the blade.

Preferably, a first groove matching the upper surface of the precision flat-nose pliers is horizontally opened on the lower surface of the bottom plate, the first groove is square, and its front and rear sides respectively penetrate the front and rear of the bottom plate ; The depth of the first groove is greater than 25mm, and its right side wall is arranged on the left side of the right side wall of the fourth groove.

Preferably, it also includes a first threaded hole and a third fastening bolt; a first threaded hole matching the third fastening bolt is horizontally opened at the lower left outer side wall of the bottom plate, and the third A threaded hole communicates with the first groove; the third fastening bolt is pressed against the left side wall of the precision vise through the first threaded hole.

Preferably, the second groove is larger than the third groove, and the third groove is larger than the fourth groove; the front and rear sides of the second groove and the third groove respectively penetrate the front and back of the bottom plate, and The front-to-rear distance of the fourth groove is smaller than the front-to-rear distance of the bottom plate.

Preferably, the upper surface of the inclined iron, the third threaded hole and the fourth threaded hole are all inclined toward the lower left of the bottom plate, and the inclination angles are all 2°.

Preferably, a positioning plate is also fixed on the lower surface of the inclined iron, the positioning plate has a cuboid structure, and its front-to-rear distance matches that of the fourth groove, and the left-to-right distance of the positioning plate is less than The left-right distance of the fourth groove; the inclined iron is positioned in the front-rear direction in the fourth groove through the positioning plate.

Preferably, the upper surface of the inclined iron is further provided with fifth threaded holes spaced in sequence along the inclined direction, and the fifth threaded holes are arranged perpendicular to the upper surface of the inclined iron and are matched with the countersunk head bolts.

Preferably, the arc backing plate is a semi-circular arc columnar structure, and counterbores are sequentially spaced on the circular arc surface along the direction of both ends of the circular arc backing plate, and the countersinking holes face the circular arc. The backing plate is opened in the center direction and matched with the countersunk head bolts.

Preferably, the radius of the arc surface of the circular arc backing plate is smaller than the radius of the inner arc of the blade, and the inner arc of the blade is placed on the circular arc surface of the circular arc backing plate.

A method of using the tooling for thinning the circular arc fitting surface of a steam turbine rotor blade of the present invention is innovative in that it includes the following steps:

Step 1: First install the precision flat vise on the milling machine table, then install the bottom plate on the upper surface of the precision flat vise through the first groove, and use the third fastening bolt to tighten it;

Step 2: Then fix the arc backing plate on the upper surface of the inclined iron through countersunk head bolts, and then place the inclined iron on the first In the three grooves, at the same time, the positioning plate on the lower surface of the inclined iron is placed in the fourth groove of the bottom plate;

Step 3: Then place the blade on the arc backing plate, so that the inner arc of the blade and the arc surface of the circular arc backing plate are closely attached, and then the left and right ends of the blade are pressed tightly by the second fastening bolts;

Step 4: Adjust the angle of the inclined iron through the angle adjustment bolt, so as to adjust the angle of the blade, until the generatrix of the circular arc surface of the blade is corrected with the dial indicator to be parallel to the main shaft of the machine tool, and the right side wall of the inclined iron is fixed by the first tightening bolt. Tighten the top, and clamp both sides of the blade with precision flat-nose pliers;

Step 5: Start the machine tool to thin the blade; after the processing is completed, loosen the precision flat-nose pliers and the second tightening bolt, replace the blade, and then tighten the left and right ends of the blade through the second tightening bolt. Flat-nose pliers clamp both sides of the blade; then continue to thin the blade.

In the present invention, the inner arc of the blade is closely attached to the arc surface of the arc backing plate, and the left and right ends of the blade are tightened with second fastening bolts, and then the angle of the inclined iron is adjusted through the angle adjustment bolts, thereby ensuring the generatrix of the arc surface of the blade. Parallel to the main shaft of the machine tool, then clamp the two sides of the blade with precision flat-nose pliers to keep the blade stationary, and start the machine tool to mill the blade that needs to be thinned on the blade with a forming milling cutter, thereby producing the following beneficial effects:

1) The present invention ensures the safety of the blade during processing because the blade is fixed.

2) After an accurate adjustment of the present invention, the remaining blades on the same impeller do not need to be adjusted when they are thinned, thereby reducing the time for blade installation and adjustment and saving costs.

3) In the present invention, the second fastening bolt is used to fix the blade, which makes it more convenient to disassemble the blade and improves the processing efficiency.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments described in the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic structural diagram of a tooling used for thinning the circular arc fitting surface of a steam turbine rotor blade according to the present invention.

FIG. 2 is a front view of the bottom plate of FIG. 1 .

FIG. 3 is a top view of the bottom plate in FIG. 1 .

FIG. 4 is a front view of the inclined iron in FIG. 1 .

FIG. 5 is a top view of the inclined iron in FIG. 1 .

FIG. 6 is a front view of the arc backing plate in FIG. 1 .

FIG. 7 is a partial cross-sectional view of the arc backing plate in FIG. 6 .

Among them, 1- precision vise; 2- angle adjustment bolt; 3- bottom plate; 4- first fastening bolt; 5- second fastening bolt; 6- oblique iron; 7- countersunk head bolt; 8- arc washer plate; 9-blade; 10-third fastening bolt; 31-first groove; 32-second groove; 33-third groove; 34-fourth groove; 35-first threaded hole; 36 - The second threaded hole; 37 - the third threaded hole; 38 - the fourth threaded hole; 61 - the positioning plate; 62 - the fifth threaded hole; 81 - the counterbore.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below through specific embodiments.

A tooling and using method for thinning the circular arc fitting surface of a steam turbine rotor blade of the present invention includes a precision flat jaw 1, a bottom plate 3, an angle adjustment bolt 2, a first tightening bolt 4, and a second tightening bolt 5 , inclined iron 6, countersunk head bolt 7, arc backing plate 8 and blade 9; the specific structure is shown in Figures 1 to 7, the bottom plate 3 is a horizontally placed cuboid structure, and the bottom surface of the bottom plate 3 is also horizontally opened with precision The first groove 31 that matches the upper surface of the pliers 1, the first groove 31 is square, and its front and rear sides respectively penetrate the front and rear of the bottom plate 3; The first threaded hole 35 matched with the fastening bolt 10, and the first threaded hole 35 is communicated with the first groove 31; the bottom plate 3 is horizontally sleeved on the upper surface of the precision vise 1 through the first groove 31, and is Tighten the fastening bolt 10; wherein, the depth of the first groove 31 is greater than 25mm.

According to the present invention, a second groove 32 , a third groove 33 and a fourth groove 34 are horizontally opened on the upper surface of the bottom plate 3 from top to bottom, and the second groove 32 , the third groove 33 and the fourth groove 34 They are all square, and the three are arranged side by side; as shown in Figures 2 and 3, the second groove 32 is larger than the third groove 33, and the third groove 33 is larger than the fourth groove 34; wherein the second groove 32 is larger than the fourth groove 34; The front and rear sides of the groove 32 and the third groove 33 respectively penetrate the front and back of the bottom plate 3, and the front and rear distance of the fourth groove 34 is smaller than the front and rear distance of the bottom plate 3; and the right side wall of the first groove 31 is arranged in the fourth groove. The left side of the right side wall of the slot 34 .

As shown in FIG. 2 and FIG. 3 , a second threaded hole 36 matching the angle adjustment bolt 2 is also vertically provided on the lower surface of the bottom plate 3 . The third groove 33 communicates with each other; a third threaded hole 37 matching with the first fastening bolt 4 is also provided at the lower position of the right outer side wall of the bottom plate 3, and the third threaded hole 37 communicates with the third groove 33; A fourth threaded hole 38 matched with the second fastening bolt 5 is also obliquely opened at the upper position of the right outer side wall of the bottom plate 3 , and the fourth threaded hole 38 communicates with the second groove 32 and extends out of the bottom plate 3 to the left. Left outer side wall; wherein, the third threaded hole 37 and the fourth threaded hole 38 are inclined toward the lower left of the bottom plate 3, and the inclination angles are both 2°.

As shown in FIG. 1 , in the present invention, an inclined iron 6 is horizontally arranged in the third groove 33, the inclined iron 6 is matched with the third groove 33, and the upper surface thereof is an inclined surface inclined toward the lower left of the bottom plate 3; wherein , the inclination angle of the upper surface of the inclined iron 6 is 2°. As shown in FIGS. 4 and 5 , the upper surface of the inclined iron 6 is also provided with fifth threaded holes 62 at intervals along the inclined direction. match. A positioning plate 61 is also fixed on the lower surface of the inclined iron 6. The positioning plate 61 has a cuboid structure, and its front and rear distances match the front and rear distances of the fourth groove 34. The left and right distance of the positioning plate 61 is smaller than that of the fourth groove 34. so that the inclined iron 6 is positioned in the front-rear direction in the fourth groove 34 through the positioning plate 61 . Among them, the angle adjustment bolt 2 is pressed against the lower surface of the inclined iron 6 through the second threaded hole 36 to adjust the inclination angle of the inclined iron 6; and the first fastening bolt 4 is pressed against the inclined iron 6 through the third threaded hole 37. On the right side wall, after the angle adjustment of the inclined iron 6 is completed, the right side wall of the inclined iron 6 is pressed tightly to position the inclined iron 6 left and right.

As shown in Figure 1, the present invention is also provided with a circular arc backing plate 8 on the upper surface of the inclined iron 6; as shown in Figures 6 and 7, the circular arc backing plate 8 is a semicircular arc columnar structure, and the Countersunk holes 81 are spaced on the surface along the direction of both ends of the arc backing plate 8 in sequence. The arc backing plate 8 is fixedly connected with the inclined iron 6 through the countersunk head bolt 7 , so that the angle of the circular arc backing plate 8 can be adjusted by adjusting the angle of the inclined iron 6 .

In the present invention, a blade 9 is also provided on the upper surface of the arc backing plate 8. As shown in FIG. 1, the inner arc of the blade 9 is placed on the arc surface of the circular arc backing plate 8, and the second fastening bolts 5 pass through the bottom plate respectively. 3. The fourth threaded holes 38 on the left and right sides are pressed against the left and right ends of the blade 9, so that the blade 9 is positioned in the left and right directions. Wherein, the radius of the arc surface of the arc backing plate 8 is smaller than the radius of the inner arc of the blade 9 .

A method of using the tooling for thinning the circular-arc abutting surface of a steam turbine rotor blade of the present invention comprises the following steps:

Step 1: First install the precision flat vise 1 on the milling machine table, then install the bottom plate 3 on the upper surface of the precision flat vise 1 through the first groove 31, and tighten it with the third fastening bolt 10;

Step 2: Then fix the arc backing plate 8 on the upper surface of the inclined iron 6 through the countersunk head bolts 7, and then according to the inclination direction of the upper surface of the inclined iron 6 and the inclination direction of the fourth threaded hole 38 on the bottom plate 3, the inclined direction The iron 6 is placed in the third groove 33 of the bottom plate 3, and at the same time, the positioning plate 61 on the lower surface of the inclined iron 6 is placed in the fourth groove 34 of the bottom plate 3, so that the front and rear directions of the inclined iron 6 can be adjusted by the fourth groove 34. position;

Step 3: Next, place the blade 9 on the arc backing plate 8, so that the inner arc of the blade 9 is in close contact with the arc surface of the circular arc backing plate 8, and then tighten the left and right ends of the blade 9 through the second fastening bolt 5. , so that the blade 9 is positioned in the left and right directions;

Step 4: Adjust the angle of the inclined iron 6 through the angle adjustment bolt 2, so as to adjust the angle of the blade 9, until the generatrix of the arc surface of the blade 9 is corrected with the dial indicator to be parallel to the main shaft of the machine tool, and the The right side wall of the inclined iron 6 is pressed tightly, so that the inclined iron 6 is positioned in the left and right directions; at the same time, the two sides of the blade 9 are clamped with the precision flat pliers 1, so that the blade 9 is fixed;

Step 5: Start the machine tool to thin the blade 9; after the processing is completed, loosen the precision flat jaw 1 and the second fastening bolt 5, replace the blade 9, and then use the second fastening bolt 5 to fix the left and right ends of the blade 9. Tighten the top, and at the same time clamp both sides of the blade 9 with the precision flat-nose pliers 1; then continue to thin the blade 9.

In the present invention, the inner arc of the blade 9 is closely attached to the arc surface of the arc backing plate 8, and the left and right ends of the blade 9 are tightened with the second fastening bolts 5, and then the angle of the inclined iron 6 is adjusted by the angle adjustment bolts 2, thereby Make sure that the busbar of the arc surface of the blade 9 is parallel to the main shaft of the machine tool, and then clamp the two sides of the blade 9 with the precision flat-nose pliers 1 to keep the blade 9 stationary, and start the machine tool to mill the blade 9 that needs to be thinned on the blade , resulting in the following beneficial effects:

1) In the present invention, since the blade 9 is fixed, the safety of the blade 9 during the machining process is ensured.

2) After an accurate adjustment of the present invention, the remaining blades 9 on the same impeller do not need to be adjusted again when thinning, thereby reducing the installation and adjustment time of the blades 9 and saving costs.

3) In the present invention, the second fastening bolt 5 is used to fix the blade 9, which makes it more convenient to disassemble the blade 9 and improves the processing efficiency.

The above-mentioned embodiments are only preferred embodiments of the present invention to describe, and do not limit the concept and scope of the present invention. Various modifications and improvements made should fall within the protection scope of the present invention, and the technical content of the claimed protection of the present invention has been fully recorded in the technical requirements.

Claims (10)

1. a kind of tooling being thinned for steam turbine blade circular arc binding face, it is characterised in that: including precision flatnosed pliers, bottom Plate, angle adjustment bolt, the first fastening bolt, the second fastening bolt, wedge, dormant bolt and circular arc backing plate；In the precision Flat-nose pliers upper surface level set is equipped with bottom plate, and the bottom plate is rectangular parallelepiped structure；The plate upper surface from top to bottom Successively level offers the second groove, third groove and the 4th groove, and second groove, third groove and the 4th groove are It is rectangular, and three is bonded setting side by side；It is horizontal in the third groove to be equipped with wedge, the wedge and the third groove phase Matching, and its upper surface is an inclined-plane；It is additionally provided with circular arc backing plate in the wedge upper surface, the circular arc backing plate passes through countersunk head spiral shell Bolt is fixedly connected with the wedge；It is also equipped with second to match with the angle adjustment bolt vertically in the lower surface of base plate Threaded hole, second threaded hole is set on the right side of the precision flatnosed pliers, and is connected to the third groove, the angle adjustment Bolt is held out against by the second threaded hole in the wedge lower surface；It also tilts and offers in the bottom plate right outside sidewall position on the lower side The third threaded hole to match with first fastening bolt, and the third threaded hole is connected to the third groove, it is described First fastening bolt is held out against on the wedge right side wall by third threaded hole；The bottom plate right outside sidewall position on the upper side also Inclination offers the 4th threaded hole to match with second fastening bolt, and the 4th threaded hole and second groove Connection, and extend the left outside side wall of the bottom plate to the left；It is additionally provided with blade in circular arc backing plate upper surface, and described second is tight Fixing bolt passes through the 4th threaded hole at left and right sides of the bottom plate respectively and holds out against in blade left and right ends.

2. a kind of tooling being thinned for steam turbine blade circular arc binding face according to claim 1, it is characterised in that: The first groove to match with the precision flatnosed pliers upper surface is offered in the lower surface of base plate also level, described first is recessed Slot is rectangular, and its front and rear sides extends through the bottom plate front-back；The depth of first groove is greater than 25mm, and it is right Side wall is set to the left side of the 4th groove right side wall.

3. a kind of tooling being thinned for steam turbine blade circular arc binding face according to claim 2, it is characterised in that: It further include the first threaded hole and third fastening bolt；In the left outside side wall of bottom plate position on the lower side, also level is offered and described The first threaded hole that three fastening bolts match, and first threaded hole is connected to first groove；The third fastening Bolt is held out against on the precision flatnosed pliers left side wall by the first threaded hole.

4. a kind of tooling being thinned for steam turbine blade circular arc binding face according to claim 1, it is characterised in that: Second groove is greater than third groove, and third groove is greater than the 4th groove；The front and back of second groove and third groove Two sides extend through the bottom plate front-back, and the longitudinal separation of the 4th groove is less than the longitudinal separation of the bottom plate.

5. a kind of tooling being thinned for steam turbine blade circular arc binding face according to claim 1, it is characterised in that: The wedge upper surface, third threaded hole and the 4th threaded hole are tilted towards the bottom plate lower left, and its tilt angle is equal It is 2 °.

6. a kind of tooling being thinned for steam turbine blade circular arc binding face according to claim 1, it is characterised in that: Positioning plate is also fixed in the wedge lower surface, and the positioning plate is rectangular parallelepiped structure, and its longitudinal separation and described the The longitudinal separation of four grooves matches, and the left and right distance of the positioning plate is less than the left and right distance of the 4th groove；It is described oblique Tie Tong crosses positioning plate front-rear direction in the 4th groove and positions.

7. a kind of tooling being thinned for steam turbine blade circular arc binding face according to claim 1, it is characterised in that: It is along inclined direction also successively spaced apart in the wedge upper surface and is equipped with the 5th threaded hole, the 5th threaded hole is perpendicular to described The setting of wedge upper surface, and match with the dormant bolt.

8. a kind of tooling being thinned for steam turbine blade circular arc binding face according to claim 1, it is characterised in that: The circular arc backing plate is the column structure of semi arch, and is successively spaced apart on its arc surface along the circular arc backing plate direction of both ends Equipped with counterbore, the counterbore is opened up towards the circular arc backing plate center position, and is matched with the dormant bolt.

9. a kind of tooling being thinned for steam turbine blade circular arc binding face according to claim 8, it is characterised in that: The radius of the circular arc backing plate arc surface is less than the radius of blade concavity, and the inner arc of blade is placed on the circle of the circular arc backing plate In cambered surface.

10. a kind of application method for the tooling being thinned for steam turbine blade circular arc binding face, it is characterised in that including following Step:

Precision flatnosed pliers: being first mounted on milling machine table by step 1, then bottom plate is mounted on accurate put down by the first groove Brank upper surface, and held out against with third fastening bolt；

Step 2: and then circular arc backing plate is fixed on to the upper surface of wedge by dormant bolt, further according to inclining for wedge upper surface Tilted direction is consistent with the inclined direction of the 4th threaded hole on bottom plate, and wedge is placed in the third groove of bottom plate, is made simultaneously The positioning plate of wedge lower surface is placed in the 4th groove of bottom plate；

Blade: being then placed on circular arc backing plate by step 3, so that the arc surface of blade concavity and circular arc backing plate is adjacent to, then leads to The second fastening bolt is crossed to hold out against blade left and right ends；

Step 4: adjusting the angle of wedge by angle adjustment bolt, so as to adjust the angle of blade, until with dial gauge school After the bus in positive blade arc face is parallel with machine tool chief axis, wedge right side wall is held out against by the first fastening bolt, while with smart Close flat-nose pliers clamps blade two sides；

Step 5: starting lathe carries out blade processing is thinned；After processing is completed, precision flatnosed pliers and the second fastening spiral shell are unclamped Bolt replaces blade, then is held out against blade left and right ends by the second fastening bolt, while clamping blade two sides with precision flatnosed pliers Face；It is further continued for blade being carried out processing is thinned.