A method for cutting the edge of a metal seal of an aero-engine and a fixture device

Abstract

The present invention provides a method and a fixture device for cutting the edges of a metal seal for an aeroengine; the fixture device includes an upper clamping block and a lower clamping block. Both the upper clamping block and the lower clamping block are of an annular cylindrical structure. The upper clamping block and the lower clamping block can be cooperatively installed through the annular outer groove of the upper clamping block and the annular boss of the lower clamping block, and are connected by screws. During the edge cutting process, the metal seal ring part with surplus material is loaded into the fixture device, and the fixture device is installed on a lathe for edge cutting. The feed positioning is accurate, the edge cutting trajectory is stable, the edge cutting dimensions are uniform, and the dimensional accuracy can reach ±0.02 mm. The surplus material of metal seal ring parts with various different cross-sectional structures is removed. The surface quality of the edge cutting is high, the part dimensional accuracy is high, and the service performance is good.

Description

Technical Field

[0001] The present invention belongs to the field of trimming complex metal annular parts, and relates to a trimming method and fixture device for a metal seal ring of an aero-engine. Background Art

[0002] The metal seal ring of an aero-engine is an axial self-tightening static seal structure with a new sealing form and better sealing effect. It is an overall annular part with a corrugated cross-section, including "C" type, "M" type, multi-corrugated type, etc. It is mostly used for gas end face sealing of aero-engines in high-temperature gas environments above 600 °C, and has the advantages of good resilience, strong vibration absorption ability, high temperature and high pressure resistance, and long service life.

[0003] Since the metal seal ring parts are mostly used in high-temperature and high-pressure working environments, age-hardening nickel-based wrought superalloy materials such as GH4169 and GH738 are mostly used. They have high yield strength, high tensile strength, and obvious work hardening phenomenon. In different forming process plans, in order to form their complex cross-sectional shapes, the formed parts mostly have process leftovers. Figure 1 The process forming process of a certain type of metal seal ring part is shown. First, the annular initial blank undergoes a forming process to form a metal seal ring part with leftovers at both ends. Subsequently, the leftovers need to be removed to obtain the final seal ring part. In order to ensure that the seal ring part can be accurately installed at the working position, the cross-sectional height dimension needs to be ensured when removing the leftovers.

[0004] Currently, trimming methods such as wire cutting can only be used for seal ring parts with relatively simple cross-sectional shapes, and the cutting surface quality is poor. The cross-sectional height dimension accuracy of the parts after cutting is poor, reducing the resilience and vibration absorption abilities of the parts during service. Summary of the Invention

[0005] The present invention provides a trimming method and fixture device for a metal seal ring of an aero-engine, overcoming the deficiencies of existing trimming methods, capable of removing the leftovers of metal seal ring parts with various different cross-sectional structures, having the advantages of simple device, strong applicability, convenient disassembly and assembly, etc., and having high trimming surface quality, high part dimension accuracy, and good service performance.

[0006] The specific technical solution of the present invention is as follows: A trimming fixture device for a metal seal ring of an aero-engine according to the present invention is composed of an upper clamp block and a lower clamp block;

[0007] The upper clamp block is a ring-shaped cylindrical structure, with a circular through-hole opened in the center along the axial direction, and an annular inner groove opened in the center along the axial direction on the lower surface, and an annular outer groove opened at the outer diameter along the axial direction;

[0008] The diameter dimension of the circular through-hole of the upper clamp block is the same as the inner diameter dimension of the seal ring part after trimming;

[0009] The diameter dimension of the annular inner groove is the same as the outer diameter dimension of the sealing ring part after trimming, and the depth of the annular inner groove is less than the width dimension of the sealing ring part after trimming in the natural state;

[0010] Uniform threaded holes are provided on the lower surface of the upper clamping block;

[0011] No fillets or chamfers can be provided at the annular inner groove of the upper clamping block;

[0012] The lower clamping block is of an annular cylindrical structure, with a circular through-hole opened at the center along the axial direction, and an annular boss provided at the outer diameter along the axial direction;

[0013] The diameter dimension of the circular through-hole of the lower clamping block is the same as the inner diameter dimension of the sealing ring part after trimming;

[0014] Uniform screw counterbore through-holes are provided on the upper surface of the lower clamping block;

[0015] No fillets or chamfers can be provided at the intersection of the circular through-hole of the lower clamping block and the lower surface;

[0016] The depth of the annular outer groove of the upper clamping block is greater than the height of the annular boss of the lower clamping block;

[0017] The inner diameter dimension of the annular outer groove of the upper clamping block is the same as the inner diameter dimension of the annular boss of the lower clamping block;

[0018] When the annular inner groove of the upper clamping block and the lower surface of the lower clamping block are installed and assembled, a sealing ring installation groove is formed;

[0019] The upper clamping block and the lower clamping block can be installed in cooperation through the annular outer groove of the upper clamping block and the annular boss of the lower clamping block, and are connected by screws;

[0020] The dimensions of the upper clamping block and the lower clamping block need to vary according to the dimensions of the sealing ring part with the surplus material;

[0021] In some embodiments, the outer diameter of the upper clamping block is the same as the outer diameter of the lower clamping block;

[0022] A method for trimming the metal sealing ring of an aero-engine according to the present invention includes the following steps:

[0023] Step 1: First, load the material and install the mold. Install the metal seal ring part with the remaining material into the annular inner groove of the upper clamp block. The side surface of the metal seal ring part with the remaining material forms a line contact with the annular inner groove of the upper clamp block. Subsequently, install the lower clamp block, and position it through the annular outer groove of the upper clamp block and the annular boss of the lower clamp block. Connect the upper clamp block and the lower clamp block with screws. At this time, the metal seal ring part located in the seal ring installation groove has a certain amount of compression in the axial direction, and the remaining materials at both ends of the metal seal ring part with the remaining material are stably suspended.

[0024] Step 2: Subsequently, perform trimming and remove the mold. Install the assembled trimming fixture on the lathe through a three-jaw chuck, and perform trimming along the circular through holes of the upper pressing block and the lower pressing block. After the feed is completed, remove the trimming fixture. After removing the mold, the metal seal ring part squeezed in the seal ring installation groove restores its elasticity.

[0025] Step 3: Finally, deburr. Use fine sandpaper to deburr the side walls at both ends of the trimming surface to obtain the trimmed seal ring part.

[0026] In some embodiments, after the metal seal ring part with the remaining material is installed in the upper pressing block and the lower pressing block, the two side surfaces of the metal seal ring part with the remaining material respectively form a narrow-band contact with the annular inner groove of the upper pressing block and the lower surface of the lower pressing block.

[0027] In some embodiments, the cross-sectional shape of the seal ring part with the remaining material is "M" type, which is an "M" type seal ring part with the remaining material.

[0028] In some embodiments, the cross-sectional shape of the trimmed seal ring part is "M" type, which is a trimmed "M" type seal ring part.

[0029] Advantages of the present invention:

[0030] 1) The trimming method of the present invention overcomes the deficiencies of the existing trimming methods, can cooperate with the lathe to realize the removal of the remaining materials of metal seal ring parts with various different cross-sectional structures, has the advantages of simple device, strong applicability, convenient disassembly and assembly, etc., and has high trimming surface quality, high part dimension accuracy, and good service performance.

[0031] 2) In the trimming fixture of the present invention, the annular inner groove of the upper clamp block and the lower surface of the lower clamp block form a seal ring installation groove after assembly. The seal ring installation groove has no chamfer at the groove opening, which can be used for precise feed during the trimming process of the lathe, providing precise positioning for the feed of the lathe during the trimming process.

[0032] 3) During the trimming process of the trimming method of the present invention, during trimming, the "M"-type seal ring part with the remaining material has a certain compression amount in the seal ring installation groove. The depth of the seal ring installation groove is slightly smaller than the width dimension of the seal ring part with the remaining material. The compression force of the seal ring installation groove ensures the stability of the seal ring part with the remaining material during the trimming process, preventing trimming errors caused by loosening of the trimmed part during the trimming process;

[0033] 4) For the trimming method and fixture device of the present invention, the trimming process is selected to be carried out on a lathe. The cutting surface quality at the trimming position is good, reducing the circumferential fluctuation error of the ultra-thin part during the trimming process. The circular through holes of the upper clamp block and the lower clamp block define the trimming diameter of the remaining material, and the trimming size is uniform, with an accuracy of up to ±0.02 mm;

[0034] 5) The trimming method and fixture device of the present invention can achieve high-precision removal of the remaining material of the metal seal ring part of the aero-engine. The trimming method can also be used for the removal of the remaining material of other annular parts with ultra-thin wall thickness. Description of the Drawings

[0035] Figure 1 is the process forming process of a certain type of metal seal ring part.

[0036] Figure 2 is the structural schematic diagram of a certain type of "M"-type metal seal ring part before trimming.

[0037] Figure 3 is the structural schematic diagram of a certain type of "M"-type metal seal ring part after trimming.

[0038] Figure 4 is the schematic diagram of the upper clamp block device of the trimming fixture for a certain type of "M"-type metal seal ring part.

[0039] Figure 5 is the schematic diagram of the lower clamp block device of the trimming fixture for a certain type of "M"-type metal seal ring part.

[0040] Figure 6 is the installation schematic diagram of the trimming fixture for a certain type of "M"-type metal seal ring part.

[0041] Figure 7 is the structural schematic diagram of a certain type of multi-wave metal seal ring part before trimming.

[0042] Figure 8 is the structural schematic diagram of a certain type of multi-wave metal seal ring part after trimming.

[0043] Figure 9 is the installation schematic diagram of the trimming fixture for a certain type of multi-wave metal seal ring part.

[0044] The descriptions of the reference numerals in the figure are as follows: 1 - Initial blank; 2 - "M"-type seal ring part with remnant material; 3 - "M"-type seal ring part after trimming; 4 - Upper clamping block of the trimming fixture for a certain type of "M"-type metal seal ring part; 5 - Annular outer groove; 6 - Annular inner groove; 7 - Lower clamping block of the trimming fixture for a certain type of "M"-type metal seal ring part; 8 - Annular boss; 9 - "M"-type seal ring installation groove; 10 - Multi-wave seal ring part with remnant material; 11 - Multi-wave seal ring part after trimming; 12 - Upper clamping block of the trimming fixture for a certain type of multi-wave metal seal ring part; 13 - Lower clamping block of the trimming fixture for a certain type of multi-wave metal seal ring part; 14 - Multi-wave seal ring installation groove; Specific implementation manner

[0045] In order to more clearly understand the above-mentioned objects, features, and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0046] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0047] The first embodiment provides a trimming method and fixture device for an "M"-type metal seal ring of an aero-engine;

[0048] Figure 2 Shown is an "M"-type seal ring part 2 with remnant material of a certain type, which is a circumferential annular part. The enlarged view at A is an enlarged view of the cross-section of the seal ring part with a small and complex cross-sectional shape required finally. The arcs on both sides of the part cross-section are connected to the remnant material. The inner diameter dimension of this part is 88.41 mm, the inner diameter dimension at the wave valley is 90.2 mm, and the natural width dimension is 2.53 mm.

[0049] Figure 3 Shown is the "M"-type seal ring part 3 after trimming. The enlarged view at B is an enlarged schematic diagram of its cross-sectional shape structure. In Figure B, its cross-sectional structure after trimming can be seen. The inner diameter dimension of the "M"-type seal ring part 3 after trimming is 89.4 mm, which is smaller than the inner diameter dimension at the wave valley. It can be vertically cut by wire cutting without affecting the part at the wave valley, but it is not easy to ensure the stability of the part and the surface quality of the trimming during cutting, and the cutting precision error is relatively large and easily exceeds the tolerance requirements. By using the trimming method described in the present invention, the inner diameter dimension precision of the "M"-type seal ring part 3 after trimming can reach.

[0050] Figure 4Shown is the upper clamp block 4 of the trimming fixture for a certain model of "M"-type metal sealing ring parts. The upper clamp block 4 of the trimming fixture for a certain model of "M"-type metal sealing ring parts is of an annular cylindrical structure, with a circular through-hole opened at the center along the axial direction. The diameter dimension of the circular through-hole is the same as the inner diameter dimension of the trimmed "M"-type sealing ring part 3. An annular inner groove 6 is opened at the center of the lower surface along the axial direction, and an annular outer groove 5 is opened at the outer diameter along the axial direction. The diameter dimension of the annular inner groove 6 is the same as the outer diameter dimension of the trimmed "M"-type sealing ring part 3. The depth of the annular inner groove 6 is 2.43 mm, which is less than the width dimension of 2.53 mm of the trimmed "M"-type sealing ring part 3 in the natural state. Uniform threaded holes are opened on the lower surface of the upper clamp block 4 of the trimming fixture for a certain model of "M"-type metal sealing ring parts. No fillets or chamfers can be opened at the annular inner groove 6 of the upper clamp block 4 of the trimming fixture for a certain model of "M"-type metal sealing ring parts.

[0051] Figure 5 Shown is the lower clamp block 7 of the trimming fixture for a certain model of "M"-type metal sealing ring parts, which is of an annular cylindrical structure, with a circular through-hole opened at the center along the axial direction, and an annular boss 8 provided at the outer diameter along the axial direction. The diameter dimension of the circular through-hole of the lower clamp block 7 of the trimming fixture for a certain model of "M"-type metal sealing ring parts is the same as the inner diameter dimension of the trimmed "M"-type sealing ring part 3. Countersunk screw through-holes are uniformly opened on the upper surface of the lower clamp block 7 of the trimming fixture for a certain model of "M"-type metal sealing ring parts. No fillets or chamfers can be opened at the junction of the circular through-hole and the lower surface of the lower clamp block 7 of the trimming fixture for a certain model of "M"-type metal sealing ring parts.

[0052] The depth of the annular outer groove 5 of the upper clamp block 4 of the trimming fixture for a certain model of "M"-type metal sealing ring parts is greater than the height of the annular boss 8 of the lower clamp block 7 of the trimming fixture for a certain model of "M"-type metal sealing ring parts. The inner diameter dimension of the annular outer groove 5 of the upper clamp block 4 of the trimming fixture for a certain model of "M"-type metal sealing ring parts is the same as the inner diameter dimension of the annular boss 8 of the lower clamp block 7 of the trimming fixture for a certain model of "M"-type metal sealing ring parts. An "M"-type sealing ring installation groove 9 is formed when the annular inner groove 6 of the upper clamp block 4 of the trimming fixture for a certain model of "M"-type metal sealing ring parts and the lower surface of the lower clamp block 7 of the trimming fixture for a certain model of "M"-type metal sealing ring parts are assembled. The upper clamp block 4 of the trimming fixture for a certain model of "M"-type metal sealing ring parts and the lower clamp block 7 of the trimming fixture for a certain model of "M"-type metal sealing ring parts can be positioned and installed by the cooperation of the annular outer groove 5 of the upper clamp block 4 and the annular boss 8 of the lower clamp block 7 of the trimming fixture for a certain model of "M"-type metal sealing ring parts, and are connected by screws. The outer diameter of the upper clamp block 4 of the trimming fixture for a certain model of "M"-type metal sealing ring parts is the same as the outer diameter dimension of the lower clamp block 7 of the trimming fixture for a certain model of "M"-type metal sealing ring parts.

[0053] Figure 6 The figure shows a sectional schematic diagram of the trimming fixture for the "M"-type seal ring part 2 with surplus material after assembly. During the trimming process, first, the "M"-type seal ring part 2 with surplus material is installed into the annular inner groove 6 of the upper clamp block 4 of a certain model of "M"-type metal seal ring part trimming fixture. The side surface of the "M"-type seal ring part with surplus material forms a line contact with the annular inner groove 6 of the upper clamp block 4 of the certain model of "M"-type metal seal ring part trimming fixture. Subsequently, the lower clamp block 7 of the certain model of "M"-type metal seal ring part trimming fixture is installed and positioned through the annular outer groove 5 of the upper clamp block 4 of the certain model of "M"-type metal seal ring part trimming fixture and the annular boss 8 of the lower clamp block 7 of the certain model of "M"-type metal seal ring part trimming fixture. The upper clamp block 4 of the certain model of "M"-type metal seal ring part trimming fixture and the lower clamp block 7 of the certain model of "M"-type metal seal ring part trimming fixture are connected by screws. At this time, the "M"-type seal ring part 2 with surplus material in the "M"-type seal ring installation groove 9 has a certain amount of compression in the axial direction, and the surplus materials at both ends of the "M"-type seal ring part 2 with surplus material are stably suspended. Subsequently, the trimming fixture is installed on the lathe through a three-jaw chuck, and trimming is performed along the circular through holes of the upper pressing block 4 and the lower pressing block 7. After the feed is completed, the trimming fixture is removed. After demolding, the metal seal ring part in the "M"-type seal ring installation groove 9 that has been compressed restores its elasticity, and the side walls at both ends of the trimmed surface are deburred to obtain the trimmed "M"-type seal ring part 3, with the inner diameter dimension deviation within ±0.02 mm and high dimensional accuracy.

[0054] The second embodiment provides a trimming method and fixture device for a multi-wave metal seal ring of an aeroengine;

[0055] Figure 7 Shown is a multi-wave seal ring part 10 of a certain model with surplus material, which is also a circumferential annular part. The enlarged view at D is the enlarged sectional view of the final required seal ring part. The part has 3 waves, and the inner diameters at the middle wave trough and the inner diameter of the multi-wave seal ring part 4 with surplus material are both 35.1 mm, and the natural width dimension is 4.7 mm.

[0056] Figure 8 Shown is the trimmed multi-wave seal ring part 11. The enlarged view E is the enlarged schematic diagram of its sectional shape structure. The inner diameter dimension of the trimmed multi-wave seal ring part 11 is 37.48 mm. As can be seen in Figure E, the inner diameter dimension of the trimmed multi-wave seal ring part 11 is larger than the inner diameter dimension at the wave trough. When performing vertical cutting using wire cutting, the middle wave trough feature will be cut off. If wire cutting at an angle is performed, problems such as poor cutting stability and poor trimmed surface quality will occur, and it is difficult to achieve a dimensional accuracy of ±0.1 mm.

[0057] Figure 9The figure shows a schematic cross-section of the trimming fixture for the multi-wave seal ring part 10 with remnant material after assembly. The upper clamp block 12 of the trimming fixture for a certain model of multi-wave seal ring part is similar in structure to the upper clamp block 4 of the trimming fixture for a certain model of "M" type seal ring part and a certain model of "M" type metal seal ring part. The diameter dimension of the circular through-hole of the upper clamp block 12 of the trimming fixture for the certain model of multi-wave seal ring part is the same as the inner diameter dimension of the trimmed multi-wave seal ring part 11. The diameter dimension of the annular inner groove of the upper clamp block 12 of the trimming fixture for the certain model of multi-wave seal ring part is the same as the outer diameter dimension of the trimmed multi-wave seal ring part 11, and the groove depth is 4.6 mm, which is less than the width dimension of 4.7 mm of the trimmed multi-wave seal ring part 11 in the natural state.

[0058] Figure 9 The lower clamp block 13 of the trimming fixture for a certain model of multi-wave seal ring part in the figure is similar to Figure 5 the lower clamp block 7 of the trimming fixture for a certain model of "M" type seal ring part and a certain model of "M" type metal seal ring part. The diameter dimension of the circular through-hole of the lower clamp block 13 of the trimming fixture for the certain model of multi-wave seal ring part is the same as the inner diameter dimension of the trimmed multi-wave seal ring part 11.

[0059] The trimming process of the multi-wave seal ring part 10 with remnant material is similar to that of the "M" type seal ring part 2 with remnant material. After assembling the part and the trimming fixture, trimming is performed on the lathe in cooperation with the multi-wave seal ring installation groove 14, and then deburring is carried out on the side walls at both ends of the trimmed surface to obtain the trimmed multi-wave seal ring part 11, with the inner diameter dimension deviation within ±0.02 mm and high dimensional accuracy.

[0060] For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several variations and improvements can still be made to the embodiments of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A metal sealing circumferential cutting edge fixture device for an aeroengine, characterized in that, It is composed of an upper clamping block and a lower clamping block; the upper clamping block is of an annular cylindrical structure, with a circular through-hole opened at the center along the axial direction, an annular inner groove opened at the center on the lower surface along the axial direction, and an annular outer groove opened at the outer diameter along the axial direction; the lower clamping block is of an annular cylindrical structure, with a circular through-hole opened at the center along the axial direction, and an annular boss provided at the outer diameter along the axial direction. The diameter dimension of the circular through-hole of the upper clamping block is the same as the inner diameter dimension of the seal ring part after trimming; evenly distributed threaded holes are opened on the lower surface of the upper clamping block. The diameter dimension of the annular inner groove is the same as the outer diameter dimension of the seal ring part after trimming, and the depth of the annular inner groove is less than the width dimension of the seal ring part in the natural state after trimming; no fillets or chamfers can be opened at the annular inner groove. The diameter dimension of the circular through-hole of the lower clamping block is the same as the inner diameter dimension of the seal ring part after trimming; evenly distributed countersunk through-holes for screws are opened on the upper surface of the lower clamping block; no fillets or chamfers can be opened at the junction of the circular through-hole of the lower clamping block and the lower surface. When the annular inner groove of the upper clamping block and the lower surface of the lower clamping block are installed and assembled, a seal ring installation groove is formed.

2. The metal sealing circumferential cutting edge fixture device for an aeroengine according to claim 1, characterized in that: The depth of the annular outer groove of the upper clamping block is greater than the height of the annular boss of the lower clamping block; the inner diameter dimension of the annular outer groove of the upper clamping block is the same as the inner diameter dimension of the annular boss of the lower clamping block.

3. A metal seal cutting-edge clamping fixture device for an aero-engine according to claim 1, characterized in that: The upper clamping block and the lower clamping block are installed in cooperation through the annular outer groove of the upper clamping block and the annular boss of the lower clamping block, and are connected by screws.

4. A method for cutting the circumferential edge of a metal seal of an aero-engine, which is implemented by using the device described in claim 1, characterized in that, It includes the following steps: Step 1: Loading and die-setting. The metal seal ring part with surplus material is loaded into the annular inner groove of the upper clamping block. The side surface of the metal seal ring part with surplus material forms a line contact with the annular inner groove of the upper clamping block. Subsequently, the lower clamping block is installed, positioned through the annular outer groove of the upper clamping block and the annular boss of the lower clamping block, and the upper clamping block and the lower clamping block are connected by screws. At this time, the metal seal ring part located in the seal ring installation groove has a certain amount of compression along the axial direction, and the surplus materials at both ends of the metal seal ring part with surplus material are stably suspended. Step 2: Trimming and mold removal. The assembled trimming fixture is installed on the lathe through a three-jaw chuck, trimming is carried out along the circular through-holes of the upper pressing block and the lower pressing block. After the feed is completed, the trimming fixture is removed, and the metal seal ring part squeezed in the seal ring installation groove restores its elasticity after mold removal. Step 3: Finally, deburring. Use fine sandpaper to deburr the side walls at both ends of the trimming surface to obtain the trimmed seal ring part.

5. A metal seal cutting-edge method for an aero-engine according to claim 4, characterized in that: After the metal seal ring part with surplus material is installed in the upper pressing block and the lower pressing block, the two side surfaces of the metal seal ring part with surplus material respectively form narrow-band contacts with the annular inner groove of the upper pressing block and the lower surface of the lower pressing block.

6. A method for cutting the circumferential edge of a metal seal of an aeroengine according to claim 4 or 5, characterized in that: The cross-sectional shape of the seal ring part with surplus material is "M" type, which is the "M" type seal ring part with surplus material; the cross-sectional shape of the trimmed seal ring part is "M" type, which is the trimmed "M" type seal ring part.

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