Size correction tooling and shape correction method for multi-leaf blade precision casting

Abstract

The application discloses a size correction tool for multi-leaf blade precision casting, which comprises a base, the top surface of the base is respectively provided with a fixing device one and a fixing device two, a shape correction block group is arranged between the fixing device one and the fixing device two, the outer side of the shape correction block group is respectively provided with a profile positioning block one and a profile positioning block two, the shape correction block group comprises at least two shape correction blocks, the shape correction blocks are slidably connected with the base, a push rod penetrating through each shape correction block is fixed, and one end of the push rod is connected with a length measuring element; the fixing device one and the fixing device two are used for fixing the multi-leaf blade, the profile positioning block one and the profile positioning block two are used for positioning the convex surfaces at the two ends of the single blade, the shape correction block is used for correcting the profile, the torsion angle and the straightness of the exhaust edge of the blade, and the size over tolerance of the casting is reduced, so that the size precision of the casting and the qualified rate of the product are improved, and the research and development cycle of the product is greatly shortened.

Description

Technical Field

[0001] This invention relates to the field of precision casting technology, and in particular to dimensional correction tooling and shaping method for multi-blade precision castings. Background Technology

[0002] Medium-sized gas turbine and aero-engine blades are generally cast using investment casting. Multi-stage blades require high dimensional accuracy and are prone to deformation during the casting process. Existing straightening methods involve using aluminum straightening clamps to straighten the exhaust edge or using simple tooling to press and straighten the throat. However, due to the multi-stage blade structure, straightening is not as convenient as with single-blade blades, and the straightening process is limited. Interference exists between blades, and only the exhaust edge can be corrected; the blade profile, bending, twisting, and the overall shape of the multi-stage blade cannot be straightened. Summary of the Invention

[0003] The main objective of this invention is to provide a dimensional correction fixture and a shaping method for multi-blade precision castings, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a dimensional correction fixture for multi-blade precision castings, comprising a base, with a fixing device one and a fixing device two respectively provided at both ends of the top surface of the base, a correction block group provided between the fixing device one and the fixing device two, and a profile positioning block one and a profile positioning block two respectively provided on the outer side of the correction block group, the correction block group comprising at least two correction blocks, the correction blocks being slidably connected to the base, each correction block having a through push rod fixedly fixed thereon, one end of the push rod being connected to a length measuring element, the other end of the push rod having a threaded section and a handle fixedly connected thereto, a threaded seat matching the threaded section of the push rod being fixedly fixed on the base, the threaded section passing through the threaded seat and being threadedly connected to the threaded seat.

[0005] Preferably, the fixing device one includes a support, and a support plate is provided on the support. The side of the support plate facing the fixing device two has an arc-shaped structure and the arc is consistent with the arc of the small edge plate of the multi-blade to be calibrated. The support plate is provided with a plurality of pressure blocks, and the pressure blocks are connected to the support plate by a first bolt.

[0006] Preferably, the support plate is slidably connected to the support base, and both ends of the support plate are threaded with screws, the bottom end of the screws being movably connected to the base.

[0007] Preferably, the second fixing device includes a plurality of pressing components arranged in an arc array. Each pressing component includes a support block and a pressure plate. One end of the pressure plate extends directly above the support block. The pressure plate is provided with a groove, through which a second bolt passes. The second bolt is threadedly connected to the support column, and the support column is fixedly connected to the base.

[0008] Preferably, a positioning post is provided below the end of the pressure plate away from the support block, the positioning post being at the same height as the support post and fixedly connected to the base.

[0009] Preferably, the side of the profile positioning block one and profile positioning block two near the straightening block matches the convex curvature of the single blade of the multi-section blade.

[0010] Preferably, there are three shaping blocks, and the side of the shaping block closest to the first shaped surface positioning block matches the concave curvature of the single blade of the multi-section blade.

[0011] Preferably, the bottom of the shaping block is provided with a T-shaped sliding part, and the two sides of the sliding part are provided with limiting slide rails that are fixedly connected to the base, and the push rod passes through the sliding part.

[0012] Preferably, the length measuring element is a dial indicator, which is mounted on the base. The end of the push rod is fixedly connected to a connecting rod, the side of the connecting rod abuts against the probe of the dial indicator, and the end of the push rod near the connecting rod slides through a limiting block, which is fixedly connected to the base.

[0013] This invention provides a method for dimensional correction of a multi-blade precision casting fixture, comprising: pressing and fixing the small and large edge plates of the multi-blade with fixing device one and fixing device two respectively; simultaneously attaching the convex surfaces of the blades to be corrected to the molded surface positioning block one and molded surface positioning block two respectively; the correction block assembly being located at the concave surface of the blades to be corrected; rotating the handle to drive the push rod to move; using the push rod to move the correction block; the correction block corrects the concave surface of the blade; and adjusting the correction size by observing the length measuring element during the correction process; after one blade is corrected, fixing device one and fixing device two are used to re-fix the multi-blade assembly; repeating the above operation until all blades on the multi-blade assembly are corrected.

[0014] Compared with traditional technologies, the beneficial effects of this invention are as follows: This invention fixes the small and large flanges of the multi-blade by fixing device one and fixing device two, thereby fixing the multi-blade. It uses profile positioning block one and profile positioning block two to position the two convex surfaces of a single blade. The push rod pushes the correction block to move, and the correction block is used to correct the profile, twist angle and exhaust edge straightness of the blade. The degree of adjustment is observed through the length measuring element. This invention can correct the profile, twist, exhaust edge straightness and throat shape of each blade of the multi-blade casting, reduce the scrapping of castings due to dimensional deviations, and effectively control the size of the multi-blade casting for gas turbines. It not only improves the dimensional accuracy of the casting and the product qualification rate, but also greatly accelerates the product development cycle. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a three-dimensional schematic diagram of the overall structure of the present invention from another perspective;

[0017] Figure 3 This is a schematic plan view of the overall structure of the present invention;

[0018] Figure 4 This is a side view of the overall structure of the present invention;

[0019] Figure 5 This is a schematic diagram of the multi-blade alignment structure of the present invention;

[0020] Figure 6 for Figure 5 Another perspective 3D illustration;

[0021] Figure 7 for Figure 5 A plan view.

[0022] In the diagram: 1. Base; 2. Fixing device one; 201. Support; 202. Support plate; 203. Pressure block; 204. First bolt; 205. Screw; 3. Fixing device two; 301. Support block; 302. Pressure plate; 303. Groove; 304. Second bolt; 305. Support column; 306. Positioning column; 4. Profile positioning block one; 5. Profile positioning block two; 6. Shaping block; 601. Sliding part; 602. Limiting slide rail; 7. Multi-section blade; 8. Push rod; 9. Length measuring element; 10. Threaded section; 11. Handle; 12. Threaded seat; 13. Connecting rod; 14. Limiting block. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0024] like Figure 1-7 As shown, a dimensional correction fixture for a multi-blade precision casting is provided, including a base 1. Fixing devices 1 (2) and 2 (3) are respectively provided at both ends of the top surface of the base 1. A correction block assembly is provided between the fixing devices 1 (2) and 2 (3). A profile positioning block 1 (4) and a profile positioning block 2 (5) are respectively provided on the outer side of the correction block assembly. The profile positioning blocks 1 (4) and 2 (5) are respectively located at both ends of the blade. The side of the profile positioning blocks 1 (4) and 2 (5) near the correction block 6 matches the curvature of the convex surface of a single blade of the multi-blade 7, used for profile positioning of the convex surfaces at both ends of the blade. The correction block assembly is located on the concave surface of the blade, used for… For the correction of the blades, the correction block group includes at least two correction blocks 6. In this example, there are three correction blocks 6, and the side of the correction block 6 near the profile positioning block 4 matches the concave curvature of the single blade of the multi-section blade 7. The correction block 6 is slidably connected to the base 1. Each correction block 6 is fixed with a through push rod 8. One end of the push rod 8 is connected to the length measuring element 9, and the other end of the push rod 8 is provided with a threaded section 10 and a handle 11 is fixedly connected to the threaded section 10. A threaded seat 12 that matches the threaded section 10 of the push rod 8 is fixed on the base 1. The threaded section 10 passes through the threaded seat 12 and is threadedly connected to the threaded seat 12.

[0025] like Figure 1 As shown, the fixing device 1 2 includes a support 201, on which a support plate 202 is provided. The side of the support plate 202 facing the fixing device 2 3 has an arc-shaped structure, and the arc is consistent with the arc of the small edge plate of the multi-blade 7 to be calibrated, so that the small edge plate of the multi-blade 7 can fit against the inner side of the support plate 202. The support plate 202 is provided with several pressure blocks 203, which are connected to the support plate 202 by a first bolt 204. The support plate 202 supports the inwardly protruding part of the small edge plate of the multi-blade 7. At the same time, the first bolt 204 is tightened, so that the pressure blocks 203 press and fix the small edge plate of the multi-blade 7. In order to facilitate the adaptation to different multi-blade 7 and adjust the support height, the support plate 202 and the support 201 are slidably connected up and down, and the two ends of the support plate 202 are threadedly connected with screws 205. The bottom end of the screws 205 is movably connected to the base 1. The height of the support plate 202 is adjusted by rotating the screws 205.

[0026] like Figure 1As shown, the fixing device 2 3 includes several pressing components arranged in an arc array. Each pressing component includes a support block 301 and a pressure plate 302. One end of the pressure plate 302 extends directly above the support block 301. The pressure plate 302 has a groove 303, through which a second bolt 304 passes. The second bolt 304 is threadedly connected to a support column 305. The support column 305 is fixedly connected to the base 1. The bottom of the large edge plate of the multi-blade 7 is supported by multiple support blocks 301. Tighten the second bolt 304 so that one end of the pressure plate 302 presses against the upper end of the multi-blade 7, thereby fixing the large edge plate of the multi-blade 7. A positioning post 306 is set below the end of the pressure plate 302 away from the support block 301. The positioning post 306 is at the same height as the support post 305 and is fixedly connected to the base 1. The positioning post 306 supports the tail end of the pressure plate 302 so that the front end of the pressure plate 302 can press horizontally against the upper surface of the large edge plate of the multi-blade 7.

[0027] like Figure 2 , 3 As shown, the bottom of the shaping block 6 is provided with a T-shaped sliding part 601. The two sides of the sliding part 601 are provided with limiting slide rails 602 that are fixedly connected to the base 1. The push rod 8 passes through the sliding part 601 and is fixedly connected to the sliding part 601. The push rod 8 is used to push the sliding part 601 to slide on the limiting slide rail 602, thereby driving the shaping block 6 to shape the blade.

[0028] like Figure 2 , 3 As shown, the length measuring element 9 is a dial indicator. The dial indicator used here is a general-purpose length measuring tool made of precision rack and pinion mechanism. Its working principle is that the small linear movement of the measuring rod caused by the measured dimension is amplified by gear transmission and transformed into the rotation of the pointer on the scale, thereby reading the size of the measured dimension. The dial indicator can accurately calculate the displacement distance of the push rod 8. The dial indicator is mounted on the base 1. The end of the push rod 8 is fixedly connected to the connecting rod 13. The side of the connecting rod 13 abuts against the measuring head of the dial indicator. The end of the push rod 8 near the connecting rod 13 slides through the limiting block 14, and the limiting block 14 is fixedly connected to the base 1.

[0029] Based on the above structure, a method for dimensional correction of a multi-blade precision casting fixture is also provided, comprising: pressing and fixing the small edge plate and the large edge plate of the multi-blade 7 with fixing device 1 2 and fixing device 2 3 respectively; simultaneously attaching the convex surfaces of the blades to be corrected to the molded surface positioning block 1 4 and molded surface positioning block 2 5 respectively; positioning block 6 is located at the concave surface of the blades to be corrected; rotating handle 11 drives push rod 8 to move; using push rod 8 to push positioning block 6 to move; positioning block 6 corrects the concave surface of the blades; and adjusting the correction size by observing length measuring element 9 during the correction process; after one blade is corrected, fixing device 1 2 and fixing device 2 3 are used to fix the multi-blade 7 again; repeating the above operation until all blades on the multi-blade 7 are corrected.

[0030] The working principle of this invention is as follows: the small and large flanges of the multi-blade 7 are fixed by fixing device 1 2 and fixing device 2 3, thereby fixing the multi-blade 7. The two convex surfaces of a single blade are positioned by profile positioning block 1 4 and profile positioning block 2 5. The push rod 8 pushes the straightening block 6 to move. The straightening block 6 is used to correct the profile, twist angle and exhaust edge straightness of the blade. The adjustment degree is observed by length measuring element 9. This invention can correct the profile, twist, exhaust edge straightness and throat shape of each blade of the multi-blade 7 casting, reduce the scrapping of castings due to dimensional deviations, and effectively control the size of the multi-blade 7 casting for gas turbines. It not only improves the dimensional accuracy of the casting and the product qualification rate, but also greatly accelerates the product development cycle.

[0031] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A dimensional correction fixture for a multi-blade precision casting, comprising a base, characterized in that: The top surface of the base is provided with fixing device one and fixing device two, and a shaping block group is provided between fixing device one and fixing device two. The outer side of the shaping block group is provided with profile positioning block one and profile positioning block two, and the shaping block group includes at least two shaping blocks. The shaping blocks are slidably connected to the base. Each shaping block is fixed with a through push rod. One end of the push rod is connected to a length measuring element, and the other end of the push rod is provided with a threaded section and a handle is fixedly connected to the threaded section. The base is fixed with a threaded seat that matches the threaded section of the push rod. The threaded section passes through the threaded seat and is threadedly connected to the threaded seat. There are three shaping blocks, and the side of the shaping block near profile positioning block one matches the concave curvature of the single blade of the multi-stage blade. The bottom of the shaping block is provided with a T-shaped sliding part. The two sides of the sliding part are provided with limiting slide rails fixedly connected to the base. The push rod passes through the sliding part. The side of profile positioning block one and profile positioning block two near the shaping block matches the convex curvature of the single blade of the multi-stage blade.

2. The dimensional correction fixture for the multi-blade precision casting according to claim 1, characterized in that: The first fixing device includes a support, on which a support plate is provided. The side of the support plate facing the second fixing device has an arc-shaped structure and the arc is consistent with the arc of the small edge plate of the multi-blade to be calibrated. The support plate is provided with a number of pressure blocks, which are connected to the support plate by a first bolt.

3. The dimensional correction fixture for the multi-blade precision casting according to claim 2, characterized in that: The support plate is slidably connected to the support base, and both ends of the support plate are threaded with screws, the bottom end of which is movably connected to the base.

4. The dimensional correction fixture for the multi-blade precision casting according to claim 1, characterized in that: The second fixing device includes several pressing components arranged in an arc array. Each pressing component includes a support block and a pressure plate. One end of the pressure plate extends directly above the support block. The pressure plate has a groove through which a second bolt passes and is threadedly connected to a support column. The support column is fixedly connected to the base.

5. The dimensional correction fixture for the multi-blade precision casting according to claim 4, characterized in that: A positioning post is provided below the end of the pressure plate away from the support block. The positioning post is at the same height as the support post and is fixedly connected to the base.

6. The dimensional correction fixture for the multi-blade precision casting according to claim 1, characterized in that: The length measuring element is a dial indicator, which is mounted on the base. The end of the push rod is fixedly connected to a connecting rod, and the side of the connecting rod abuts against the probe of the dial indicator. The end of the push rod near the connecting rod slides through a limiting block, and the limiting block is fixedly connected to the base.

7. A method for correcting the dimensions of a multi-blade precision casting based on any one of claims 1-6, characterized in that, include: The small and large edge plates of the multi-section blades are pressed and fixed by fixing device one and fixing device two, respectively. At the same time, the convex surfaces at both ends of the blade to be shaped are respectively attached to the profile positioning block one and profile positioning block two. The shaping block group is located at the concave surface of the blade to be shaped. The handle is turned to drive the push rod to move. The push rod pushes the shaping block to move. The shaping block corrects the concave surface of the blade. During the shaping process, the shaping size is adjusted by observing the length measuring element. After the shaping of one blade is completed, the multi-section blades are fixed again by fixing device one and fixing device two. The above operation is repeated until all blades on the multi-section blades are shaped.

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