A grinding fixture and grinding method for a fan case support plate

Abstract

The application discloses a kind of grinding clamps and grinding methods for fan case support plate, belong to engine component grinding technical field.Jig includes bottom plate, first clamping station and second clamping station are equipped on bottom plate, each station includes front support seat, rear support seat, hook type block, positioning sleeve and reference block.The front support seat is equipped with positioning surface and horizontal first reference surface, the hook type block is equipped with second U-shaped groove, and the reference block is equipped with second reference surface.In first station, the first end surface of the front edge of support plate is horizontal upward, and the second end surface of the front edge of support plate is parallel to the second reference surface;In second station, the second end surface of the front edge of support plate is horizontal upward after the part is turned over, and the first end surface of the front edge of support plate is parallel to the second reference surface.During grinding, the height of the end surface to be ground is measured by the first reference surface, and the parallelism of the other end surface is detected by the second reference surface with a plug gauge.The application solves the problem of lack of special jig in the prior art, and the grinding efficiency is improved by 12 times, ensuring the flatness and symmetry of the two end surfaces.

Description

Technical Field

[0001] This invention relates to the field of engine component grinding technology, and in particular to a grinding fixture and grinding method for a fan casing support plate. Background Technology

[0002] The fan casing is a crucial component of an aero-engine, requiring the circumferential assembly of multiple support plates. As key structural components connecting the fan casing to other parts, the assembly accuracy of these support plates directly impacts the overall engine performance. To meet the assembly requirements between the end faces of the support plates and other components, a certain clearance must be maintained between adjacent support plates. However, due to inevitable deformation after welding and machining of the fan casing, the actual dimensions and positions of the support plate edges often deviate from design values. Therefore, grinding is necessary on both sides of the support plate edges to meet the assembly clearance requirements, while strict requirements must be placed on the flatness and symmetry of the support plate edges.

[0003] Currently, the existing technology for grinding the sides of the support plate mainly adopts manual operation. Operators use a rotary file to manually grind both sides of the edge plate. However, the lack of dedicated clamps for holding and positioning the support plate results in low grinding efficiency. In addition, some clamps can only perform simple clamping functions and cannot provide the measurement reference required for grinding while clamping.

[0004] In summary, the existing fan casing support plate edge grinding technology suffers from the lack of dedicated fixtures, and there is an urgent need for a dedicated fixture and grinding method that can quickly and efficiently complete the support plate edge grinding. Summary of the Invention

[0005] To address the shortcomings of existing technologies where the grinding of fan casing support plates lacks dedicated fixtures, resulting in low grinding efficiency and the inability to provide measurement benchmarks, this invention provides a grinding fixture and grinding method for fan casing support plates. The invention aims to achieve rapid positioning and clamping of the support plate using a dedicated fixture with dual clamping stations, providing accurate measurement benchmarks at each station. The two stations correspond to the grinding of the two end faces of the support plate, respectively, allowing for high-quality grinding of both end faces of the support plate without repeated fixture adjustments.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a grinding fixture for a fan casing support plate, mainly comprising a base plate, on which a first clamping station and a second clamping station are provided. Each clamping station includes a front support seat, a rear support seat, a hook-shaped block, a positioning sleeve, and a reference block.

[0007] The front support is mounted on the top surface of the left end of the base, and a positioning surface is provided on the front support. The top surface of the front support is set as a first reference surface, and the first reference surface is horizontal. The rear support is mounted on the top surface of the right end of the base, and a positioning hole is provided on the rear support. The hook-shaped block is mounted on the front support, and a second U-shaped groove is provided on the hook-shaped block for engaging with the front edge protrusion of the support plate. The positioning sleeve is mounted in the positioning hole of the rear support, and a fixing hole is provided at the left end of the positioning sleeve for mounting the rear edge of the support plate to fix the support plate. The reference block is mounted on the front support, and a second reference surface is provided at the upper end of the reference block.

[0008] When the support plate component is installed in the first clamping station, the first end face of the leading edge of the support plate component faces upward and is in a horizontal state, and the second end face of the leading edge of the support plate component is parallel to the second reference surface of the reference block on the first clamping station. When the support plate component is flipped over and installed in the second clamping station, the second end face of the leading edge of the support plate component faces upward and is in a horizontal state, and the first end face of the leading edge of the support plate component is parallel to the second reference surface of the reference block on the second clamping station.

[0009] With the above dual-station design, the two end faces of the support plate can be ground on the first clamping station and the second clamping station respectively, without the need to readjust the angle and position of the fixture. Each station is equipped with a horizontal measuring reference and an inclined auxiliary measuring reference, allowing the operator to quickly and accurately complete the grinding process of the corresponding end face.

[0010] Preferably, the front support is an inverted T-shaped structure composed of an upper vertical plate and a lower horizontal plate, with the lower horizontal plate integrally formed at the lower end of the upper vertical plate. The lower horizontal plate is fastened to the base by a first locating pin and a first screw. The inverted T-shaped structure has good stability and rigidity, and can withstand the cutting force during the grinding process.

[0011] Preferably, a rectangular hole is provided on the upper vertical plate. The hook-shaped block includes a U-shaped block, a square prism integrally formed on the side of the U-shaped block, and a threaded post integrally formed on the end face of the square prism. The second U-shaped groove is provided on the U-shaped block. The square prism is inserted into the rectangular hole to determine the groove direction of the second U-shaped groove. A locking nut is screwed onto the threaded post to lock the hook-shaped block. The fit between the square prism and the rectangular hole is a rectangular surface fit, and the hook-shaped block will not rotate after insertion, thereby accurately ensuring the groove direction of the second U-shaped groove.

[0012] Preferably, a pressing protrusion is integrally formed on the side of the U-shaped block. The pressing protrusion is used to press against the front edge side plate of the support plate part, further enhancing the stability and reliability of the support plate positioning.

[0013] Preferably, the right end of the base is provided with a first U-shaped groove, and the lower part of the rear support is integrally formed with a rectangular protrusion, which slides in conjunction with the first U-shaped groove. By sliding the rectangular protrusion in the first U-shaped groove, the left and right positions of the rear support on the base can be adjusted according to the actual length of the support plate to accommodate support plates of different sizes.

[0014] Furthermore, third screw holes are provided on both sides of the first U-shaped groove, and an oblong hole is provided on the lower ear plate of the rear support. The oblong plate of the lower rear support is fastened to the base by a second screw, which passes through the oblong hole and screws into the third screw hole. Through the cooperation of the oblong hole and the second screw, the position of the rear support can be adjusted and reliably locked after adjustment.

[0015] Preferably, the upper end face of the rear support is provided with a fifth screw hole, which extends downward to the positioning hole. A third screw is fitted onto the fifth screw hole, and the third screw is used to tighten the positioning sleeve to prevent the positioning sleeve from moving axially in the positioning hole.

[0016] Furthermore, the left half of the positioning sleeve slides into the positioning hole, and a strip-shaped groove is provided on the outer cylindrical surface of the left half of the positioning sleeve. The tightening end of the third screw extends into the strip-shaped groove to form an anti-loosening structure. This anti-loosening structure prevents the positioning sleeve from accidentally coming out of the positioning hole, and because the strip-shaped groove extends axially, the positioning sleeve can still slide axially within a certain range to adapt to the length of different support plates.

[0017] Preferably, the reference block is fastened to the side of the upper vertical plate by screws and locating pins, ensuring the accuracy and stability of the installation position of the reference block.

[0018] Secondly, the present invention also provides a grinding method for a fan casing support plate, using the above-mentioned grinding fixture, comprising the following steps: S1. When it is necessary to grind the first end face of the leading edge of the support plate on the support plate part, install the support plate part to be ground on the first clamping station of the grinding fixture, so that the first end face of the leading edge of the support plate is facing upward and in a horizontal state. Use the first reference surface of the front support seat on the clamping station as the measurement reference to measure the height of the first end face of the leading edge of the support plate; use the second reference surface of the reference block on the clamping station as the measurement reference to check the gap value between the second end face of the leading edge of the support plate and the second reference surface of the station with a feeler gauge; and use a grinding machine to grind the first end face of the leading edge of the support plate according to the above measurement results. S2. When it is necessary to grind the second end face of the leading edge of the support plate on the support plate part, install the support plate part to be ground on the second clamping station of the grinding fixture, so that the second end face of the leading edge of the support plate is facing upward and in a horizontal state. Use the first reference surface of the front support seat on the clamping station as the measurement reference to measure the height of the second end face of the leading edge of the support plate; use the second reference surface of the reference block on the clamping station as the measurement reference to check the gap value between the first end face of the leading edge of the support plate and the second reference surface of the station with a feeler gauge; and use a grinding machine to grind the second end face of the leading edge of the support plate according to the above measurement results.

[0019] In the above-described grinding method, since the first and second clamping stations correspond to the grinding of the two end faces of the support plate, the operator only needs to remove the support plate from one station, flip it over, and install it on the other station, without the need for complex angle adjustments. At each station, the horizontal first reference surface can be used for precise measurement of the end face height, and the inclined second reference surface, in conjunction with a feeler gauge, can be used to check the parallelism and symmetry of the other end face, thus achieving quantitative control of end face grinding.

[0020] In summary, the present invention provides a grinding fixture and grinding method for a fan casing support plate. Through a dual-clamping station design, the grinding of the two end faces of the support plate is performed. Each station is fixed and supported by a front support and a rear support. The front and rear edges of the support plate are clamped by hook blocks and positioning sleeves, ensuring that the end face to be ground is horizontal, allowing the grinding head to be ground without complex alignment. By measuring the first reference surface of the front support and the second reference surface of the reference block, the grinding amount and symmetry of the two end faces of the support plate can be quantitatively determined, ensuring processing quality.

[0021] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: First, the invention features a dual-clamping station, significantly improving grinding efficiency. Existing technologies lack dedicated clamps, requiring operators to manually grind with rotary files, taking approximately 3 hours to grind a single support plate. This invention utilizes a dedicated dual-station clamp to achieve rapid positioning and clamping of the support plate. The two stations correspond to the grinding of the two end faces of the support plate, respectively, enabling mechanized grinding in conjunction with a grinding machine. This reduces the grinding time for a single support plate from 3 hours to approximately 15 minutes, increasing grinding efficiency by about 12 times.

[0022] Secondly, the processing quality is significantly improved. This invention provides precise measurement references at each workstation through the first reference surface (horizontal) of the front support and the second reference surface (inclined) of the reference block. When grinding the first end face at the first workstation, the height of the first end face is measured using the horizontal first reference surface, and the parallelism of the second end face is checked using a feeler gauge with the inclined second reference surface; the same applies when grinding the second end face at the second workstation. The operator can quantitatively measure and control the grinding amount and the symmetry between the two end faces, ensuring the flatness and symmetry requirements of both sides of the support plate edge.

[0023] Third, it is easy to operate and requires no complex programming. Because the fixture structure design of this invention ensures that the end face to be ground is parallel to the horizontal plane at each station, the grinding head of the grinding machine does not need to perform complex angle alignment and complex CNC program control during grinding. The grinding head only needs to move horizontally to complete the grinding, which greatly reduces the difficulty of operation and the skill requirements of the operator. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional model of the grinding fixture provided by the present invention.

[0026] Figure 2 This is a three-dimensional model of the base in this invention.

[0027] Figure 3 This is a three-dimensional model diagram of the front support seat in this invention.

[0028] Figure 4 This is a three-dimensional model diagram of the hook-shaped block in this invention.

[0029] Figure 5 This is a three-dimensional model diagram of the reference block in this invention.

[0030] Figure 6 This is a three-dimensional model diagram of the rear support seat in this invention.

[0031] Figure 7 This is a three-dimensional model diagram of the positioning sleeve in this invention.

[0032] Figure 8 This is a schematic diagram showing the installation of the support plate part to be repaired in the first clamping position of the repair fixture.

[0033] Figure 9 A schematic diagram is provided for the installation of the support plate part to be repaired in the first clamping position of the repair fixture.

[0034] Reference numerals: 1. Base; 2. Front support; 2a. Upper vertical plate; 2b. Lower horizontal plate; 3. Reference block; 4. Hook-shaped block; 4a. U-shaped block; 5. Rear support; 6. Positioning sleeve; 7. First screw hole; 8. First screw; 9. First pin hole; 10. First positioning pin; 11. First U-shaped groove; 12. Second screw; 13. Third screw hole; 14. Third pin hole; 15. Rectangular hole; 16. First bolt hole; 17. Positioning surface; 18. First reference surface; 19. Second screw hole; 20. Second pin hole; 21. Four 21. Prism; 22. Threaded column; 23. Second U-shaped groove; 24. Second reference surface; 25. Second bolt hole; 26. Fourth pin hole; 27. Rectangular protrusion; 28. Waist-shaped hole; 29. ​​Positioning hole; 30. Fifth screw hole; 31. Fixing hole; 32. Strip-shaped countersunk groove; 33. Third screw; 34. Clamping protrusion; 35. Locking nut; 100. First clamping station; 200. Second clamping station; 301. First end face of the front edge of the support plate; 302. Second end face of the front edge of the support plate; 303. Front edge protrusion of the support plate; 304. Side plate of the front edge of the support plate. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0037] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0038] See Figures 1 to 9This invention provides a grinding fixture and grinding method for a fan casing support plate. The fixture mainly includes a base 1, on which a first clamping station 100 and a second clamping station 200 are provided. Each clamping station includes a front support 2, a rear support 5, a hook-shaped block 4, a positioning sleeve 6, and a reference block 3. The structure, connection relationship, function, and operation method of each component are described in detail below with reference to the accompanying drawings.

[0039] I. Structure and Function of Base 1 like Figure 1 and Figure 2 As shown, the base 1 is a flat plate structure with sufficient rigidity and stability to support and fix all other components. The left end of the base 1 is used to assemble the front support 2, and the right end is used to assemble the rear support 5. In this embodiment, the base 1 is made of cast iron, which has good vibration damping performance and dimensional stability. The base 1 is provided with a first clamping station 100 and a second clamping station 200, which are arranged along the front-rear direction of the base 1 and operate independently.

[0040] The top surface of the left end of the base 1 is provided with a first pin hole 9 and a first screw hole 7. The first pin hole 9 is a precision-machined hole, which cooperates with the first positioning pin 10 to achieve precise positioning of the front support seat 2 on the base 1. The first screw hole 7 is a threaded hole, used to install the first screw 8, and the front support seat 2 is fastened to the base 1 by the first screw 8.

[0041] The right end of the base 1 has two first U-shaped grooves 11, which extend in the left-right direction and have a U-shaped cross-section. The first U-shaped grooves 11 are used to slide with the rectangular protrusions 27 on the lower part of the rear support seat 5, so that the rear support seat 5 can slide on the base 1 in the left-right direction to adjust the distance between the rear support seat 5 and the front support seat 2, thereby accommodating support plates of different lengths. Third screw holes 13 are provided on both sides of the first U-shaped grooves 11 for installing second screws 12, which fix the rear support seat 5 to the base 1.

[0042] II. Structure and Function of Front Support 2 like Figure 1 and Figure 3 As shown, the front support 2 is an inverted T-shaped structure composed of an upper vertical plate 2a and a lower horizontal plate 2b, with the lower horizontal plate 2b integrally formed at the lower end of the upper vertical plate 2a. The inverted T-shaped structure has a large bottom support area, which can provide stable and reliable support for the front edge of the support plate.

[0043] The lower horizontal plate 2b is provided with a second pin hole 20 and a second screw hole 19, which correspond to the positions of the first pin hole 9 and the first screw hole 7 of the base 1, respectively. During assembly, the first positioning pin 10 is first inserted into the first pin hole 9 and the second pin hole 20 to achieve precise positioning of the front support 2 on the base 1. Then, the first screw 8 is passed through the second screw hole 19 and screwed into the first screw hole 7 and tightened to reliably fix the front support 2 on the base 1.

[0044] The upper side of the upper vertical plate 2a is designated as the positioning surface 17. The positioning surface 17 is a precision-machined plane used to tightly fit with the side of the front edge side plate 304 of the support plate component. When assembling the support plate component, the operator abuts the side of the front edge side plate 304 of the support plate component against the positioning surface 17 for positioning.

[0045] The top surface of the upper vertical plate 2a is set as the first reference surface 18. The first reference surface 18 is a finished horizontal surface. This first reference surface 18 serves as the absolute reference for measuring the height of the end face to be ground at the front edge of the support plate. Before using the grinding machine for grinding, the operator first zeroes the measuring tool such as a height gauge or dial indicator on the first reference surface 18, and then moves the measuring tool to the end face to be ground at the front edge of the support plate for measurement. The measured value is the actual height of the end face, and the grinding allowance can be quantitatively determined by comparing it with the target value.

[0046] A rectangular hole 15 is also provided on the upper vertical plate 2a, which penetrates the upper vertical plate 2a in the front-to-back direction for assembling the hook-shaped block 4. The rectangular hole 15 has a rectangular cross-section, and the corner of the rectangular hole 15 has a specific angle with the horizontal plane. This angle determines the inclination direction of the second U-shaped groove 23 of the hook-shaped block 4. The four inner walls of the rectangular hole 15 are all precision-machined surfaces, forming a precise fit with the quadrangular prism 21 of the hook-shaped block 4.

[0047] In addition, the upper vertical plate 2a is provided with a first bolt hole 16 and a third pin hole 14 on its side for mounting the reference block 3. The positions of the first bolt hole 16 and the third pin hole 14 correspond one-to-one with the second bolt hole 25 and the fourth pin hole 26 on the reference block 3, respectively.

[0048] III. Structure and Function of Hook Block 4 like Figure 1 and Figure 4 As shown, the hook-shaped block 4 is an integral structure, mainly comprising a U-shaped block 4a, a quadrangular prism 21, and a threaded post 22. The quadrangular prism 21 is integrally formed on the side of the U-shaped block 4a, and the threaded post 22 is integrally formed on the end face of the quadrangular prism 21. The cross-section of the quadrangular prism 21 is rectangular, and its dimensions form a precise sliding fit with the rectangular hole 15 on the front support 2. When the quadrangular prism 21 is inserted into the rectangular hole 15, due to the anti-rotation characteristic of the rectangular fit, the hook-shaped block 4 cannot rotate around its axis, thereby precisely ensuring the slot direction of the second U-shaped groove 23.

[0049] A second U-shaped groove 23 is provided on the U-shaped block 4a, which is used to cooperate with the protrusion 303 on the front edge of the support plate. After the protrusion 303 on the front edge of the support plate is engaged with the second U-shaped groove 23, the inclination angle of the front edge of the support plate is precisely defined. A pressing protrusion 34 is integrally formed on the side of the U-shaped block 4a, which is used to press against the support plate front edge side plate 304 of the support plate part after the hook block 4 is installed in place (e.g., ...). Figure 9 As shown in the figure, this further enhances the stability and reliability of the support plate parts positioning, and prevents the support plate from shifting during the grinding process.

[0050] A locking nut 35 is screwed onto the threaded post 22 at the end of the quadrangular prism 21. After the quadrangular prism 21 of the hook block 4 is inserted into the rectangular hole 15 to the appropriate position, the operator tightens the locking nut 35. The end face of the locking nut 35 abuts against the side of the front support seat 2, thereby firmly fixing the hook block 4 on the front support seat 2 and preventing the hook block 4 from loosening during the grinding process.

[0051] IV. Structure and Function of Reference Block 3 like Figure 1 and Figure 5 As shown, the reference block 3 is an independent block-shaped component, and its side is fitted to the side of the upper vertical plate 2a of the front support 2. The reference block 3 is provided with a fourth pin hole 26 and a second bolt hole 25, which correspond to the positions of the third pin hole 14 and the first bolt hole 16 on the front support 2, respectively. During assembly, the reference block 3 is first precisely installed on the front support 2 using a locating pin, and then a screw is screwed through the first bolt hole 16 into the second bolt hole 25 and tightened to reliably fix the reference block 3.

[0052] The upper end of the reference block 3 is provided with a second reference surface 24. The second reference surface 24 is a precision-machined inclined surface. After the front edge of the support plate is clamped and positioned by the hook block 4, the un-grinded end face of the front edge of the support plate is parallel to the second reference surface 24 of this station. Therefore, the second reference surface 24 can be used as an auxiliary reference for measuring the parallelism and symmetry of the un-grinded end face of the support plate. The operator can use the second reference surface 24 as a reference and, in conjunction with a feeler gauge, accurately check the positional deviation of the un-grinded end face, thereby indirectly controlling the grinding amount of the grinded end face and the symmetry of the two end faces.

[0053] V. Structure and Function of Rear Support 5 like Figure 1 and Figure 6 As shown, a rectangular protrusion 27 is integrally formed on the lower part of the rear support seat 5. The size of the rectangular protrusion 27 is in sliding fit with the first U-shaped groove 11 on the base 1. After the rectangular protrusion 27 is inserted into the first U-shaped groove 11, the rear support seat 5 can slide along the extension direction (i.e., the left and right direction) of the first U-shaped groove 11, thereby adjusting the position of the rear support seat 5 to adapt to the support requirements of support plates of different lengths.

[0054] The rear support 5 has integrally formed ear plates on both the front and rear sides of its lower part, with oblong holes 28 on the ear plates. The oblong holes 28 are elongated holes extending in the left-right direction. The second screw 12 passes through the oblong holes 28 and is screwed into the third screw hole 13 on the base 1. After the rear support 5 is slidably adjusted to the correct position, tightening the second screw 12 will fix the rear support 5 onto the base 1. The design of the oblong holes 28 allows the position of the rear support 5 to be continuously adjustable within a certain range, enhancing the adaptability of the clamp to different support plates.

[0055] The upper end of the rear support 5 is provided with a positioning hole 29. The positioning hole 29 is a round hole that penetrates the upper part of the rear support 5 in the left-right direction. The positioning hole 29 is used to assemble the positioning sleeve 6 to ensure that the axial direction of the positioning sleeve 6 is consistent with the positioning direction of the second U-shaped groove 23 of the hook block 4.

[0056] The upper end face of the rear support 5 is provided with a fifth screw hole 30, which extends vertically downward to the positioning hole 29. A third screw 33 is mounted on the fifth screw hole 30, and the end of the third screw 33 extends into the positioning hole 29 to tighten the positioning sleeve 6.

[0057] VI. Structure and Function of Positioning Sleeve 6 like Figure 1 and Figure 7 As shown, the positioning sleeve 6 has a stepped shaft-like structure. The outer diameter of the left half of the positioning sleeve 6 is in sliding fit with the inner diameter of the positioning hole 29 of the rear support 5, allowing the positioning sleeve 6 to slide axially within the positioning hole 29. The left end face of the positioning sleeve 6 is provided with a fixing hole 31, which is a circular blind hole with an inner diameter matching the outer diameter of the rear edge of the support plate, used to insert and fix the rear edge of the support plate.

[0058] A strip-shaped countersunk groove 32 is provided on the outer cylindrical surface of the left half of the positioning sleeve 6. The strip-shaped countersunk groove 32 extends axially along the positioning sleeve 6, and its width matches the end diameter of the third screw 33. When the positioning sleeve 6 is inserted into the positioning hole 29, the end of the third screw 33 extends into the strip-shaped countersunk groove 32, forming an anti-disengagement structure. This anti-disengagement structure can prevent the positioning sleeve 6 from accidentally coming out of the positioning hole 29. On the other hand, because the strip-shaped countersunk groove 32 extends axially, the positioning sleeve 6 can still slide axially within a certain range to accommodate fine adjustments to the length of different support plates.

[0059] When assembling the support plate, the operator first inserts the rear edge of the support plate into the fixing hole 31, then pushes the positioning sleeve 6 along its axial direction. After adjusting it to the appropriate position, the operator tightens the third screw 33 so that the tightening end of the third screw 33 rests against the bottom surface of the strip-shaped groove 32, thereby fixing the positioning sleeve 6. For disassembly, simply loosen the third screw 33 and pull the positioning sleeve 6 to the right in the positioning hole 29 to facilitate the removal of the support plate.

[0060] VII. Configuration Relationship of Dual Clamping Stations like Figure 1 As shown, the base 1 is provided with a first clamping station 100 and a second clamping station 200. The two stations are arranged in the front-to-back direction on the base 1, and each station is equipped with a complete front support seat 2, a rear support seat 5, a hook block 4, a positioning sleeve 6 and a reference block 3.

[0061] The installation angle configurations of the first clamping station 100 and the second clamping station 200 are different: when the support plate part is installed on the first clamping station 100, the first end face 301 of the front edge of the support plate faces upward and is in a horizontal state, and the second end face 302 of the front edge of the support plate is parallel to the second reference surface 24 of the reference block 3 on the first clamping station 100.

[0062] When the support plate part is flipped and installed on the second clamping station 200, the second end face 302 of the front edge of the support plate faces upward and is in a horizontal state, and the first end face 301 of the front edge of the support plate is parallel to the second reference surface 24 of the reference block 3 on the second clamping station 200.

[0063] The above configuration can be achieved by having the rectangular holes 15 on the front support seats 2 of the two stations tilt in different directions, resulting in different tilt angles for the second U-shaped grooves 23 of the hook-shaped blocks 4 at the two stations. Thus, when the same support plate part is installed at the first and second stations, the upward-facing end faces are different, but both remain horizontal.

[0064] VIII. Specific Operating Procedures for Grinding The grinding method provided by this invention uses the above-mentioned fixture and is carried out according to the following steps: S1. Grind the first end face 301 of the leading edge of the support plate: First, according to the length of the grinding support plate part to be repaired, loosen the second screw 12, slide the rear support 5 along the first U-shaped groove 11 to the appropriate position, and then tighten the second screw 12 to fix the rear support 5.

[0065] Then, align the front edge protrusion 303 of the support plate to be ground with the second U-shaped groove 23 of the hook-shaped block 4 on the first clamping station 100, and simultaneously make the front edge side plate 304 of the support plate abut against the positioning surface 17 of the front support seat 2. Next, push the positioning sleeve 6 to insert the rear edge of the support plate into the fixing hole 31 of the positioning sleeve 6, so that the front edge protrusion 303 of the support plate is inserted into the second U-shaped groove 23 of the hook-shaped block 4. Tighten the locking nut 35 to fix the hook-shaped block 4 on the front support seat 2, and press the protrusion 34 to press the front edge side plate 304 of the support plate; at the same time, tighten the third screw 33 to press the strip-shaped countersunk groove 32 of the positioning sleeve 6, completing the positioning and installation of the support plate parts. At this time, the first end face 301 of the front edge of the support plate is facing upward and is in a horizontal state, and the second end face 302 of the front edge of the support plate is parallel to the second reference surface 24 of the reference block 3.

[0066] Measurement and Grinding: Zero the height gauge or dial indicator on the first reference surface 18 of the front support 2. Then move the measuring tool to the first end face 301 of the front edge of the support plate for measurement and record the measured value. Determine the grinding allowance of the first end face 301 based on the difference between the measured value and the design target value. At the same time, use a feeler gauge to check the gap between the second end face 302 of the front edge of the support plate and the second reference surface 24 of the station to determine the parallelism and symmetry of the second end face 302. Start the grinding machine. Since the first end face 301 of the front edge of the support plate is parallel to the horizontal plane, the grinding head does not need to be adjusted in angle and only needs to be fed in the horizontal direction for grinding. Multiple measurements can be taken during the grinding process until the target dimension is reached.

[0067] S2. Grind the second end face 302 of the leading edge of the support plate: Loosen the locking nut 35 and the third screw 33, and pull the positioning sleeve 6 to the right to remove the support plate part from the first clamping station 100. Then flip the support plate part over and install it on the second clamping station 200 in the same way as the first station, so that the second end face 302 of the front edge of the support plate is facing upward and in a horizontal state, and the first end face 301 of the front edge of the support plate is parallel to the second reference surface 24 of the reference block 3 on the second clamping station 200.

[0068] Measurement and Grinding: Using the first reference surface 18 of the front support seat 2 on the second clamping station 200 as the measurement reference, measure the height of the second end face 302 of the front edge of the support plate to determine the grinding allowance. Using the second reference surface 24 of the reference block 3 of this station as the reference, use a feeler gauge to check the gap value between the first end face 301 of the front edge of the support plate and the second reference surface 24 of this station. Then start the grinding machine to grind the second end face 302 of the front edge of the support plate.

[0069] S3. Remove the repaired support plate: After the second end face is ground, loosen the locking nut 35 and the third screw 33, pull the positioning sleeve 6 to the right, pull the rear edge of the support plate out of the fixing hole 31, and at the same time make the front edge protrusion 303 of the support plate disengage from the second U-shaped groove 23, and then remove the ground support plate.

[0070] IX. Working Principle and Accuracy Guarantee The working principle of this invention can be summarized as follows: the first clamping station 100 and the second clamping station 200 on the base 1 respectively correspond to the grinding of the two end faces of the support plate. At each station, the tilt angle of the support plate is determined by the cooperation between the second U-shaped groove 23 of the hook block 4 and the front edge protrusion 303 of the support plate, and the rear edge of the support plate is fixed by the positioning sleeve 6 on the rear support seat 5. The tilt angles of the two stations are configured differently, that is, the tilt angles of the second U-shaped groove 23, the second reference surface 24, and the positioning hole 29 corresponding to the two clamping stations are different, so that when the support plate is in the first station, the first end face 301 of the front edge of the support plate is horizontal and the second end face 302 of the front edge of the support plate is parallel to the second reference surface 24; when the support plate is in the second station, the second end face 302 of the front edge of the support plate is horizontal and the first end face 301 of the front edge of the support plate is parallel to the second reference surface 24.

[0071] Regarding accuracy assurance: the parallelism between the first reference surface 18 and the horizontal plane is ensured through precision machining; the parallelism between the second reference surface 24 and the un-grinded end face is ensured through angular consistency; and the parallelism between the end face to be ground and the horizontal plane is ensured through the positioning accuracy of the hook block 4. The machining accuracy of each of the above reference surfaces and positioning surfaces is controlled within 0.005mm through grinding processes, and the angular tolerance is controlled within ±0.5′, fully meeting the accuracy requirements for support plate grinding.

[0072] Since the end face to be ground is parallel to the horizontal plane, the flatness of the end face can be ensured by moving the grinding head horizontally during grinding. Because the grinding amount of both end faces can be quantitatively measured and controlled through the cooperation of the first and second reference surfaces, the symmetry of both end faces can also be effectively guaranteed.

[0073] 10. Industrial Applicability This invention provides a grinding fixture and method for fan casing support plates, which can be widely applied to the grinding of aero-engine fan casing support plates. It can also be extended to the grinding of flanges in other similar structures (such as turbine casings, compressor casings, etc.) and the grinding of various plate parts requiring flatness and symmetry. This invention features a compact structure, simple operation, high grinding efficiency, and stable processing quality. It can significantly reduce manufacturing costs and shorten production cycles, possessing good industrial practical value and broad application prospects.

[0074] The foregoing has provided a detailed description of a grinding fixture and grinding method for a fan casing support plate provided by the present invention. The descriptions of the above embodiments are merely for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A grinding fixture for a fan casing support plate, characterized in that, Includes a base plate (1), on which a first clamping station (100) and a second clamping station (200) are provided; Each clamping station includes a front support (2), a rear support (5), a hook block (4), a positioning sleeve (6), and a reference block (3); The front support seat (2) is mounted on the top surface of the left end of the base (1), and a positioning surface (17) is provided on the front support seat (2); the top surface of the front support seat (2) is set as the first reference surface (18), and the first reference surface (18) is set horizontally; The rear support (5) is mounted on the top surface of the right end of the base (1), and the rear support (5) is provided with a positioning hole (29). The hook-shaped block (4) is assembled on the front support seat (2), and the hook-shaped block (4) is provided with a second U-shaped groove (23), which is used to cooperate with the front edge protrusion (303) of the support plate; The positioning sleeve (6) is fitted into the positioning hole (29) of the rear support seat (5). The left end of the positioning sleeve (6) is provided with a fixing hole (31), which is used to fit the rear edge of the support plate to fix the support plate. The reference block (3) is assembled on the front support seat (2), and the upper end of the reference block (3) is provided with a second reference surface (24). When the support plate part is installed on the first clamping station (100), the first end face (301) of the front edge of the support plate part is facing upward and is in a horizontal state, and the second end face (302) of the front edge of the support plate part is parallel to the second reference surface (24) of the reference block (3) on the first clamping station (100). When the support plate part is flipped and installed on the second clamping station (200), the second end face (302) of the support plate part is facing upward and is in a horizontal state, and the first end face (301) of the support plate part is parallel to the second reference surface (24) of the reference block (3) on the second clamping station (200).

2. A grinding fixture for a fan casing support plate according to claim 1, characterized in that, The front support (2) is an inverted T-shaped structure consisting of an upper vertical plate (2a) and a lower horizontal plate (2b). The lower horizontal plate (2b) is integrally formed at the lower end of the upper vertical plate (2a). The lower horizontal plate (2b) is fastened to the base (1) by a first positioning pin (10) and a first screw (8).

3. A grinding fixture for a fan casing support plate according to claim 2, characterized in that, A rectangular hole (15) is provided on the upper vertical plate (2a); The hook-shaped block (4) includes a U-shaped block (4a), a quadrangular prism (21) integrally formed on the side of the U-shaped block (4a), and a threaded post (22) integrally formed on the end face of the quadrangular prism (21); the second U-shaped groove (23) is provided on the U-shaped block (4a); the quadrangular prism (21) is inserted into the rectangular hole (15) to determine the groove direction of the second U-shaped groove (23); A locking nut (35) is screwed onto the threaded post (22) to lock the hook block (4).

4. A grinding fixture for a fan casing support plate according to claim 3, characterized in that, A pressing protrusion (34) is integrally formed on the side of the U-shaped block (4a), and the pressing protrusion (34) is used to press against the front edge side plate (304) of the support plate part.

5. A grinding fixture for a fan casing support plate according to claim 1, characterized in that, The right end of the base (1) is provided with a first U-shaped groove (11), and the lower part of the rear support (5) is integrally formed with a rectangular protrusion (27); the rectangular protrusion (27) slides in cooperation with the first U-shaped groove (11).

6. A grinding fixture for a fan casing support plate according to claim 5, characterized in that, The first U-shaped groove (11) is provided with a third screw hole (13) on both sides, and the lower ear plate of the rear support (5) is provided with a waist-shaped hole (28); the lower ear plate of the rear support (5) is fastened to the base (1) by a second screw (12), and the second screw (12) is inserted through the waist-shaped hole (28) and screwed into the third screw hole (13).

7. A grinding fixture for a fan casing support plate according to claim 1, characterized in that, The upper end face of the rear support (5) is provided with a fifth screw hole (30), which extends downward to the positioning hole (29). A third screw (33) is fitted on the fifth screw hole (30), and the third screw (33) is used to tighten the positioning sleeve (6).

8. A grinding fixture for a fan casing support plate according to claim 7, characterized in that, The left half of the positioning sleeve (6) is slidably fitted with the positioning hole (29), and a strip-shaped groove (32) is provided on the outer cylindrical surface of the left half of the positioning sleeve (6); the tightening end of the third screw (33) extends into the strip-shaped groove (32) to form an anti-loosening structure.

9. A grinding fixture for a fan casing support plate according to claim 2, characterized in that, The reference block (3) is fastened to the side of the upper vertical plate (2a) by screws and locating pins.

10. A method for grinding a fan casing support plate, using the grinding fixture according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1. When it is necessary to grind the first end face (301) of the front edge of the support plate on the support plate part, the support plate part to be ground is installed on the first clamping station (100) of the grinding fixture, and the first end face (301) of the front edge of the support plate is facing upward and in a horizontal state. The first reference surface (18) of the front support seat (2) on the clamping station is used as the measurement reference to measure the height of the first end face (301) of the front edge of the support plate. The second reference surface (24) of the reference block (3) on the clamping station is used as the measurement reference to check the gap value between the second end face (302) of the front edge of the support plate and the second reference surface (24) of the station. The first end face (301) of the front edge of the support plate is ground by a grinding machine according to the above measurement results. S2. When it is necessary to grind the second end face (302) of the front edge of the support plate on the support plate part, the support plate part to be ground is installed on the second clamping station (200) of the grinding fixture, and the second end face (302) of the front edge of the support plate is facing upward and in a horizontal state. The first reference surface (18) of the front support seat (2) on the clamping station is used as the measurement reference to measure the height of the second end face (302) of the front edge of the support plate. The second reference surface (24) of the reference block (3) on the clamping station is used as the measurement reference to check the gap value between the first end face (302) of the front edge of the support plate and the second reference surface (24) of the station. The second end face (302) of the front edge of the support plate is ground by a grinding machine according to the above measurement results.

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