Clamping device for plane grinding of graphite sealing ring for aviation

Abstract

The utility model relates to the technical field of aero-engines, and discloses a graphite sealing ring plane grinding clamping device for aviation, which adopts a plane grinding clamp comprising a plurality of limiting blocks, utilizes the limiting blocks to clamp graphite sealing rings, and can adapt to graphite sealing rings with different diameters under the condition that the thicknesses of the limiting blocks meet requirements. The requirement for manufacturing a special tool for the sealing ring with each diameter is avoided, the problems that the number of special clamps is large, the machining period is long, the manufacturing cost is high and the machining difficulty is large are solved, and the purpose of replacing the special clamps with a small number of flat grinding clamps is achieved. Moreover, in the process that the clamp clamps the graphite sealing ring, the measuring mechanism measures the parallelism between the to-be-ground end face of the graphite sealing ring and the machine tool workbench through the measuring meter, and the machining precision can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of aero-engine technology and discloses a flat grinding clamping device for aero-engine graphite sealing rings. Background Technology

[0002] In aero-engines, graphite sealing rings play a crucial role. During the surface grinding of graphite sealing rings, specialized tooling is required to fix the graphite sealing rings onto the machine tool's worktable, such as... Figure 1 As shown, the existing special-purpose tooling includes a metal ring and multiple metal sector segments. The inner hole of the graphite sealing ring is supported by a metal ring, and the outer circle of the graphite sealing ring is supported by multiple metal sector segments. The special-purpose tooling is magnetically fixed on the worktable of a surface grinder to achieve tight fixation. However, the existing special-purpose tooling is only suitable for graphite sealing rings of a specific diameter. For sealing rings of various diameters, separate special-purpose tooling is required, resulting in a large number of tooling components. Moreover, the processing cycle of the special-purpose tooling is long and the cost is high. Due to its large size and high precision requirements, the manufacturing of the special-purpose tooling is also difficult and the pass rate is low. Utility Model Content

[0003] The purpose of this utility model is to provide a flat grinding clamping device for graphite sealing rings used in aviation, which solves the problems of a large number of special fixtures, long processing cycle, high manufacturing cost and high processing difficulty, and achieves the goal of replacing special fixtures with a small number of flat grinding fixtures.

[0004] To achieve the above-mentioned technical effects, the technical solution adopted by this utility model is as follows:

[0005] A graphite sealing ring flat grinding clamping device for aviation applications, comprising:

[0006] A surface grinding fixture, the surface grinding fixture including a plurality of limiting blocks mounted on a machine tool worktable, the limiting blocks having abutting portions for abutting against a limiting graphite sealing ring, the thickness of the abutting portions being less than the thickness of the graphite sealing ring;

[0007] A measuring mechanism is fixed on the machine tool worktable and is equipped with a measuring gauge for measuring the parallelism between the end face of the graphite sealing ring to be processed and the machine tool worktable when the limiting block clamps the graphite sealing ring.

[0008] Furthermore, the graphite sealing ring has a flat surface, and the limiting block has a flat opening for abutting against the flat surface.

[0009] Furthermore, the graphite sealing ring is a complete ring structure; the limiting block is divided into several groups along the circumference of the graphite sealing ring, and at least one in each group abuts against the inner wall surface of the graphite sealing ring, and at least one abuts against the outer wall surface of the graphite sealing ring.

[0010] Furthermore, the graphite sealing ring includes at least two single-lobed graphite sealing rings; the limiting block is divided into an end group and several middle groups, the flat opening of the limiting block of the end group abuts against the flat opening surface of the end of the single-lobed graphite sealing ring, and at least one limiting block in each middle group abuts against the inner wall surface of the single-lobed graphite sealing ring and at least one limiting block abuts against the outer wall surface of the single-lobed graphite sealing ring.

[0011] Furthermore, the limiting block is a magnetic metal block or has a magnetic part that magnetically attracts the machine tool worktable.

[0012] Furthermore, the measuring mechanism also includes a magnetic base, a column, and a cantilever. The magnetic base is mounted on the machine tool worktable, the bottom end of the column is fixed to the magnetic base, the top end of the column is rotatably connected to the cantilever, the measuring instrument is connected to the cantilever, and the cantilever is provided with a guide component for the measuring instrument to slide.

[0013] Furthermore, the measuring instrument is a dial indicator or a micrometer.

[0014] Furthermore, the parallelism of the two end faces of the flat grinding fixture is no greater than 0.02 mm, and the perpendicularity of the side face of the flat grinding fixture to the end face is no greater than 0.02 mm.

[0015] Furthermore, the surface roughness of the flat grinding fixture is no greater than Ra0.8.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention employs a surface grinding fixture comprising several limiting blocks. The limiting blocks clamp the graphite sealing ring, and, provided the thickness of the limiting blocks meets the requirements, it can accommodate graphite sealing rings of different diameters. This avoids the need to manufacture dedicated tooling for each diameter of sealing ring, solving the problems of numerous dedicated fixtures, long processing cycles, high manufacturing costs, and high processing difficulty. It achieves the goal of replacing dedicated fixtures with a small number of surface grinding fixtures. Furthermore, during the clamping process of the graphite sealing ring, the measuring mechanism uses a measuring dial indicator to measure the parallelism between the end face of the graphite sealing ring to be ground and the machine tool table, ensuring processing accuracy. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the existing graphite sealing ring clamping technology;

[0019] Figure 2 This is a schematic diagram of the surface grinding fixture in the embodiment;

[0020] Figure 3 This is a schematic diagram of the flat grinding fixture clamping the entire graphite sealing ring in the embodiment;

[0021] Figure 4This is a schematic diagram of a flat grinding fixture clamping a single-lobed graphite sealing ring in an embodiment.

[0022] Figure 5 This is a schematic diagram of the measuring mechanism in the embodiment;

[0023] Among them, 1-flat grinding fixture, 11-limiting block, 111-flat mouth, 21-measuring gauge, 22-cantilever, 23-column, 24-magnetic seat, 3-full ring graphite sealing ring, 4-single-lobed graphite sealing ring. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0025] Example

[0026] See Figure 2-5 A graphite sealing ring flat grinding and clamping device for aviation applications, comprising:

[0027] The surface grinding fixture 1 includes several limiting blocks 11 mounted on the machine tool worktable. Each limiting block 11 has a contact portion for abutting a limiting graphite sealing ring. The thickness of the contact portion is less than the thickness of the graphite sealing ring. In this embodiment, the limiting blocks 11 adopt a ring-shaped structure. Figure 2 As shown, the annular limiting block 11 serves as the abutment portion. The limiting block 11 can also be designed with other structures according to actual production needs. In this case, the entire or partial portion of the limiting block 11 acts as the abutment portion. By ensuring that the thickness of the abutment portion is less than the thickness of the graphite sealing ring, the surface grinding fixture 1 is not ground during surface grinding, thus guaranteeing the stability of the graphite sealing ring clamping. The limiting block 11 can be made of a magnetic metal block, or a magnetic part, such as a magnetic metal part, can be provided on the limiting block 11 to magnetically attract the machine tool worktable, allowing the limiting block 11 to be magnetically attracted to the machine tool worktable. The limiting block 11 can also be made of a non-magnetic metal. When installing the limiting block 11, the machine tool worktable with negative pressure adsorption function will adsorb and fix the limiting block 11 onto the worktable. The structure of the limiting block 11 can also be designed as a non-annular structure according to the requirements of negative pressure adsorption and clamping.

[0028] A measuring mechanism is fixed to the machine tool worktable and includes a measuring gauge 21 for measuring the parallelism between the end face of the graphite sealing ring to be machined and the machine tool worktable when the graphite sealing ring is clamped in the grinding fixture 1. The measuring gauge 21 is a commercially available dial indicator or micrometer with a magnetic base. In this embodiment, several annular magnetic limiting blocks 11 are used as the grinding fixture 1. These blocks have good magnetism, such as ferromagnetic metal rings. In use, the grinding fixture 1 is fixed by magnetic attraction between the grinding machine worktable and the magnetic limiting blocks 11. The graphite sealing ring is clamped by the annular limiting blocks 11. As long as the thickness of the limiting blocks 11 meets the requirements, it can accommodate graphite sealing rings of different diameters, avoiding the need to manufacture special tooling for each diameter of sealing ring. This solves the problems of a large number of special fixtures, long processing cycles, high manufacturing costs, and high processing difficulty, achieving the goal of replacing special fixtures with a small number of grinding fixtures 1. Furthermore, during the process of clamping the graphite sealing ring in the fixture, the measuring mechanism measures the parallelism between the workpiece and the machine tool table using measuring table 21, which ensures machining accuracy.

[0029] In this embodiment, when the graphite sealing ring has a flat surface, the limiting block 11 is provided with a flat opening 111 for abutting against the flat surface, such as... Figure 2 As shown, the flat surface 111 of the limiting block 11 abuts against the flat surface of the graphite sealing ring to increase the contact area and improve the stability of clamping and positioning.

[0030] In this embodiment, for the annular limiting block 11, the parallelism of its two end faces is no greater than 0.02 mm, and the perpendicularity of the side surface of the limiting block 11, i.e. the cylindrical surface and the flat surface, to the end face is no greater than 0.02 mm, so as to ensure the accuracy of clamping the graphite sealing ring. The surface roughness of the limiting block 11 is no greater than Ra0.8, so as to ensure the accuracy of clamping the graphite sealing ring while minimizing the risk of the fixture scratching the graphite sealing ring.

[0031] When the graphite sealing ring is a complete ring structure, the flat grinding fixture 1 clamps the complete ring graphite sealing ring 3 as follows: Figure 3 As shown, all the limiting blocks 11 abut against the inner and outer sides of the complete graphite sealing ring 3. All the limiting blocks 11 are divided into several groups along the circumference of the graphite sealing ring. In each group, at least one block abuts against the inner wall surface of the complete graphite sealing ring 3, and at least one block abuts against the outer wall surface. All groups of limiting blocks 11 are equidistantly distributed along the circumference of the graphite sealing ring to ensure the stability of the graphite sealing ring clamping and prevent the graphite sealing ring from detaching from the limiting blocks 11 during surface grinding. It should be noted that when the surface grinding fixture 1 clamps the complete graphite sealing ring 3, the cylindrical surface of the surface grinding fixture 1 abuts against the graphite sealing ring to accommodate the curved surface of the graphite sealing ring.

[0032] In this embodiment, in each group of limiting blocks 11, only one limiting block 11 abuts against the inner wall surface of the complete graphite sealing ring 3, and only one limiting block 11 abuts against the outer wall surface of the complete graphite sealing ring 3. Furthermore, the inner and outer limiting blocks 11 are distributed radially along the graphite sealing ring. By setting the limiting blocks 11 on both the inner and outer sides of the complete graphite sealing ring 3 one-to-one opposite each other, they abut against each other, as shown... Figure 3 As shown, firstly, it can improve the perpendicularity and parallelism accuracy of the whole-ring graphite sealing ring 3 after processing; secondly, it can prevent damage such as grinding fracture of the whole-ring graphite sealing ring 3 due to uneven force during the clamping process.

[0033] When the graphite sealing ring includes at least two single-lobed graphite sealing rings 4, each single-lobed graphite sealing ring 4 needs to be clamped and positioned individually for surface grinding. Therefore, when the surface grinding fixture 1 clamps the single-lobed graphite sealing ring 4, as follows: Figure 4 As shown, all the limiting blocks 11 abut against the periphery of the single-lobed graphite sealing ring 4 and are divided into end groups and several middle groups; the flat opening 111 of the limiting blocks 11 in the end group abuts against the flat opening surface of the end of the single-lobed graphite sealing ring 4 to increase the contact area and improve the stability of clamping and positioning; in each middle group, at least one limiting block 11 abuts against the inner wall surface of the single-lobed graphite sealing ring 4 and at least one flat grinding jig 1 abuts against the outer wall surface of the single-lobed graphite sealing ring 4, and the flat grinding jig 1 in the middle group abuts against the curved surface of the graphite sealing ring with a cylindrical surface. In this embodiment, in each middle group, only one limiting block 11 abuts against the inner wall surface of the single-lobed graphite sealing ring 4, and only one limiting block 11 abuts against the outer wall surface of the single-lobed graphite sealing ring 4. Moreover, the two limiting blocks 11 on the inner and outer sides of the single-lobed graphite sealing ring 4 are distributed radially along the graphite sealing ring. By setting the limiting blocks 11 on the inner and outer sides of the single-lobed graphite sealing ring 4 one-to-one and abutting against each other, the perpendicularity and parallelism accuracy of the single-lobed graphite sealing ring 4 after processing can be improved. During the clamping process, damage such as grinding fracture of the single-lobed graphite sealing ring 4 due to uneven force can be avoided.

[0034] like Figure 5As shown, the measuring mechanism also includes a magnetic base 24, a column 23, and a cantilever 22. The measuring mechanism is fixed to the worktable of the grinding machine by magnetic attraction of the magnetic base 24. The bottom end of the column 23 is fixed to the magnetic base 24, and the top end of the column 23 is rotatably connected to the cantilever 22 through a bearing. The cantilever 22 is provided with a guide assembly for the sliding of the measuring gauge 21. In this embodiment, the cantilever 22 is a ferromagnetic metal rod with a square cross-section. The magnetic base of the measuring gauge 21 is magnetically attracted to the cantilever 22. At this time, the entire cantilever 22 is a guide rod for the sliding of the measuring gauge 21. The measuring gauge 21 can be moved as needed to accommodate graphite sealing rings of different diameters. When the measuring gauge 21 does not have a magnetic base, the entire or partial straight section of the cantilever 22 is a guide rod in the guide assembly. The measuring gauge 21 is equipped with a sleeve, and the measuring gauge 21 slides on the cantilever 22 through the sleeve. When it is necessary to fix the measuring gauge 21, tighten the bolt on the sleeve so that the bolt presses against the cantilever 22, thereby fixing the measuring gauge 21. A damping ring is added between the cantilever 22 and the column 23 to ensure that the cantilever 22 cannot rotate on its own and can only rotate when a thrust is applied.

[0035] When clamping the graphite sealing ring, first place the surface grinding fixture 1 and the graphite sealing ring on the grinding machine worktable, ensuring that the surface grinding fixture 1 and the graphite sealing ring are as close as possible. Then, apply magnetism to the grinding machine worktable to magnetically fix the surface grinding fixture 1. Magnetically place the measuring mechanism on the worktable and adjust the position of the dial indicator or micrometer so that the probe of the dial indicator or micrometer contacts the end face of the graphite sealing ring to be processed. Then, tap the fixture with appropriate force or use a tool to apply a pushing force to the limiting block 11 to fine-tune the position of the limiting block 11, so that the limiting block 11 clamps the graphite sealing ring. During this process, by rotating the cantilever 22, use the dial indicator or micrometer to measure the parallelism between the end face of the graphite sealing ring to be processed and the worktable. When the graphite sealing ring is clamped and the parallelism between the end face of the graphite sealing ring to be processed and the worktable meets the preset requirements, remove the measuring mechanism and begin the surface grinding process.

[0036] By using the flat grinding fixture 1 of this embodiment, the size specifications of the graphite sealing rings produced in batches or typical parts can be sorted out, so that the flat grinding fixture 1 of one thickness can be used to clamp graphite sealing rings of various thicknesses.

[0037] This invention employs a surface grinding fixture 1 comprising several limiting blocks 11. The limiting blocks 11 are used to clamp graphite sealing rings. Provided the thickness of the limiting blocks 11 meets requirements, it can accommodate graphite sealing rings of different diameters, avoiding the need to manufacture dedicated tooling for each diameter. This solves the problems of numerous dedicated fixtures, long processing cycles, high manufacturing costs, and high processing difficulty, achieving the goal of replacing dedicated fixtures with a small number of surface grinding fixtures. Furthermore, during the clamping process of the graphite sealing ring, the measuring mechanism uses a measuring dial 21 to measure the parallelism between the end face of the graphite sealing ring to be ground and the machine tool table, ensuring processing accuracy.

[0038] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A grinding and clamping device for graphite sealing rings used in aviation, characterized in that, include: A flat grinding fixture (1) includes a plurality of limiting blocks (11) mounted on a machine tool worktable. The limiting blocks (11) have abutting parts for pressing against a limiting graphite sealing ring. The thickness of the abutting parts is less than the thickness of the graphite sealing ring. The measuring mechanism is fixed on the machine tool workbench and is equipped with a measuring gauge (21) for measuring the parallelism between the end face of the graphite sealing ring to be processed and the machine tool workbench when the limiting block (11) clamps the graphite sealing ring.

2. The graphite sealing ring grinding and clamping device for aviation applications according to claim 1, characterized in that, The graphite sealing ring has a flat surface, and the limiting block (11) has a flat opening (111) for abutting against the flat surface.

3. The graphite sealing ring grinding and clamping device for aviation as described in claim 1 or 2, characterized in that, The graphite sealing ring is a complete ring structure; The limiting block (11) is divided into several groups along the circumference of the graphite sealing ring. In each group, at least one abuts against the inner wall surface of the graphite sealing ring, and at least one abuts against the outer wall surface of the graphite sealing ring.

4. The grinding and clamping device for graphite sealing rings for aviation applications according to claim 2, characterized in that, The graphite sealing ring includes at least two single-lobed graphite sealing rings (4); The limiting block (11) is divided into an end group and several middle groups. The flat opening (111) of the limiting block (11) of the end group abuts against the flat opening surface of the end of the single-lobed graphite sealing ring (4). In each middle group, at least one limiting block (11) abuts against the inner wall surface of the single-lobed graphite sealing ring (4), and at least one limiting block (11) abuts against the outer wall surface of the single-lobed graphite sealing ring (4).

5. The grinding and clamping device for graphite sealing rings for aviation applications according to any one of claims 1-4, characterized in that, The limiting block (11) is a magnetic metal block or has a magnetic part that magnetically attracts the machine tool worktable.

6. The grinding and clamping device for graphite sealing rings for aviation applications according to claim 1, characterized in that, The measuring mechanism also includes a magnetic base (24), a column (23) and a cantilever (22). The magnetic base (24) is installed on the machine tool worktable. The bottom end of the column (23) is fixed to the magnetic base (24). The top end of the column (23) is rotatably connected to the cantilever (22). The measuring instrument (21) is connected to the cantilever (22), and the cantilever (22) is provided with a guide component for the measuring instrument (21) to slide.

7. The graphite sealing ring grinding and clamping device for aviation applications according to claim 1, characterized in that, The measuring instrument (21) is a dial gauge or a per mille gauge.

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