A processing method for a thin-wall cavity sealing ring part

Abstract

A processing method for a thin-wall cavity sealing ring part, comprising the following steps: S1, clamping and positioning the forging blank, turning the first curved surface and the outer circle on the part and leaving a margin; S2, rough boring the center hole: rough boring the center hole and the first fillet between the first curved surface and the center hole, and leaving a margin; S3, rough turning the annular groove on the part and leaving a margin; S4, finishing turning the first curved surface, the center hole and the first fillet to size; S5, finishing turning the outer circle and the transition round angle R1 of the first curved surface and the outer circle; S6, finishing turning the annular groove; S7, rough turning the second fillet of the part; S8, cutting: cutting the part from the forging blank to obtain a semi-finished part; S9, clamping the semi-finished part obtained in step S8 by using a clamping tool, rough turning the second curved surface on the other side of the part and leaving a margin; and then finishing turning the second curved surface and the second fillet to size, and finishing turning the transition round angle R2 of the second curved surface and the outer circle.

Description

Technical Field

[0001] This invention relates to the field of thin-walled sealing parts processing technology in aero-engine manufacturing, and particularly to a processing method for thin-walled cavity sealing ring parts. Background Technology

[0002] Sealing rings play a crucial role in the gas sealing structure of aero-engines, effectively solving the auxiliary sealing problem in high-temperature, high-pressure, and corrosive environments, and significantly improving aero-engine performance. These parts are characterized by their light weight, thin walls, precise dimensions, and susceptibility to deformation during machining, making them extremely difficult to manufacture.

[0003] Combination Figure 1 and Figure 2 The diagram shows the structure of a sealing ring component for an aero-engine. The sealing ring component 1 has curved surfaces on both sides, including a first curved surface 102 and a second curved surface 106. The sealing ring component 1 has a central hole 104 in its center. A first rounded edge 103 transitions between the first curved surface 102 and the wall of the central hole 102; a second rounded edge 107 transitions between the second curved surface 106 and the wall of the central hole 102. An annular groove 105 is also present on the sealing ring component 1. This component has small dimensional tolerances, thin walls (minimum wall thickness 0.8 mm), poor rigidity, and severe vibration during machining, making it difficult to meet the required machining accuracy. Traditional machining processes require multiple clamping operations, and the component is easily deformed during machining due to clamping and cutting forces, resulting in a very low pass rate. Summary of the Invention

[0004] The main objective of this invention is to propose a processing method for thin-walled cavity sealing ring parts, aiming to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention proposes a processing method for thin-walled cavity sealing ring parts, comprising the following steps:

[0006] S1. Clamp and position the forging blank, machine the first curved surface and outer circle on the part, and leave a allowance;

[0007] S2, Rough boring of the center hole: Rough boring of the center hole and the first rounding between the first curved surface and the center hole, leaving a margin;

[0008] S3. Roughly machine the annular groove on the part and leave a margin.

[0009] S4. Finish machine the first curved surface, the center hole, and the first rounding to the required dimensions;

[0010] S5, finish turning the outer circle, and the transition fillet R1 between the first curved surface and the outer circle;

[0011] S6, precision machined annular groove;

[0012] S7, the second rounding of the rough-machined part;

[0013] S8. Cutting: Cutting the part from the forging blank to obtain a semi-finished part;

[0014] S9. Use a clamping fixture to clamp the semi-finished part obtained in step S8, rough turn the second curved surface on the other side of the part, leaving a margin; then finish turn the second curved surface and the second fillet to the size, and finish turn the transition fillet R2 between the second curved surface and the outer circle.

[0015] Preferably, in step S9, the clamping fixture includes a base, a pressure plate, and bolts; a contour groove opposite to the first curved surface and the first rounded surface on the part is provided on the base; multiple threaded holes are evenly distributed on the base at the outer position of the contour groove; when clamping the semi-finished part, the machined first curved surface and the first rounded surface are placed and fitted on the contour groove, one end of the pressure plate extends into the annular groove of the part, and the bolt passes through the pressure plate and is screwed into the threaded hole of the base to press the pressure plate tight.

[0016] Preferably, a boss is provided on the top surface of the base, and when the semi-finished part is clamped, the boss is inserted into the center hole of the part for centering.

[0017] Preferably, a pad is provided between the top surface of the base and the pressure plate, the pad extending to the side wall of the annular groove of the part.

[0018] Preferably, the allowance reserved in step S1 is 0.2mm; the allowance in step S2 is 0.2mm; and the allowance reserved in the rough machining of the annular groove in step S3 is 0.2mm.

[0019] Preferably, in step S3, when rough turning the annular groove, a 3mm grooving tool is used, the CNC program uses G75 for a pecking cutting cycle, the feed rate F is set to 0.05mm / r, and the spindle speed is 800r / min during cutting.

[0020] Preferably, in step S4, the feed rate F is set to 0.02 mm / r, the depth of cut is set to 0.05 mm, and the spindle speed during cutting is 800 r / min.

[0021] Preferably, in step S5, when finishing the outer circle and the transition fillet R1 between the first curved surface and the outer circle, the feed rate F is set to 0.02 mm / r, the depth of cut is set to 0.02 mm, and the spindle speed is 800 r / min during cutting.

[0022] Preferably, in step S6, when finishing the annular groove, a grooving cutter with a width of 2.1 mm is used, the feed rate F is set to 0.02 mm / r, and the spindle speed is set to 200 r / min during cutting; a bidirectional splicing method is adopted during the machining process, first machining one side of the part cavity, and then machining the other side of the part cavity, and different depths of cut are used during the machining process to prevent the part from deforming.

[0023] Preferably, in step S9, a 0.2mm allowance is reserved for finish turning after rough turning. During finish turning, the feed rate F is set to 0.02mm / r, the depth of cut is set to 0.02mm, and the spindle speed is 800r / min.

[0024] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0025] (1) The processing method provided by the present invention eliminates the need for vacuum heat treatment to remove stress and prevent deformation of thin-walled parts, which is a traditional processing method. This reduces the number of processing steps and shortens the processing cycle of the parts.

[0026] (2) During the processing, the annular groove adopts the pecking cutting method and the bi-directional splicing method. At the same time, by reasonably arranging the processing allowance removal sequence and optimizing the processing parameters, the cutting force applied by the tool to the part during the processing is reduced, which solves the problem that the part is easily deformed during processing and ensures the dimensional accuracy requirements and appearance quality of the part.

[0027] (3) In this invention, a special clamping fixture for thin-walled cavity sealing ring parts is provided, which solves the problem of difficulty in clamping a thin-walled cavity sealing ring during the processing of the present invention. The special clamping fixture solves the problem that the thin-walled cavity sealing ring parts are easily deformed by the clamping force of the fixture and the cutting force of the tool during the processing by the design of the profile groove structure that fits with the curved surface of the part and the reasonable arrangement of the clamping position.

[0028] (4) The processing method for thin-walled cavity sealing ring parts provided by the present invention is simple and easy to implement, and can be easily replicated in the processing of similar parts. While greatly improving the pass rate of part processing, it can ensure good consistency of repeated processing of parts. Attached Figure Description

[0029] 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.

[0030] Figure 1 This is a schematic diagram of the thin-walled cavity sealing ring component in this invention;

[0031] Figure 2 This is a schematic diagram showing the dimensional requirements of the thin-walled cavity sealing ring component in this invention;

[0032] Figure 3 This is the state of the thin-walled cavity sealing ring component in this invention before it is cut from the forging blank;

[0033] Figure 4 This is a structural diagram of the base in the clamping fixture of the present invention;

[0034] Figure 5 A schematic diagram of the clamping of the thin-walled cavity sealing ring part when machining the other side of the shape in this invention.

[0035] Explanation of reference numerals in the attached drawings: 1. Sealing ring part; 101. Outer circle; 102. First curved surface; 103. First rounded edge; 104. Center hole; 105. Annular groove; 106. Second curved surface; 107. Second rounded edge; 2. Bolt; 3. Base; 301. Contouring groove; 302. Boss; 303. Threaded hole; 4. Pressure plate; 5. Pad. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Combination Figure 1 , Figure 2 The diagram shows a structural schematic of a sealing ring component for an aero-engine. The sealing ring component 1 has curved surfaces on both sides, including a first curved surface 102 and a second curved surface 106. The sealing ring component 1 has a central hole 104 in its middle. A first rounded edge 103 transitions between the first curved surface 102 and the wall of the central hole 102; a second rounded edge 107 transitions between the second curved surface 106 and the wall of the central hole 102; and an annular groove 105 is provided on the sealing ring component 1.

[0040] Combination Figures 3 to 5 As shown, this embodiment provides a processing method for a thin-walled cavity sealing ring part, including the following steps:

[0041] S1. Clamp and position the forging blank, and machine the first curved surface 102 and the outer circle 101 on the part, leaving a 0.2mm allowance.

[0042] S2, Rough boring of center hole 104: Rough boring of center hole 104, and first rounding 103 between first curved surface 102 and center hole 104, leaving a 0.2mm allowance.

[0043] S3. Rough turn the annular groove 105 on the part, leaving a 0.2mm allowance. This allowance can correct for deformation caused by subsequent machining or stress release. Specifically, a 3mm grooving tool is used for rough turning the annular groove 105. The CNC program uses G75 for a pecking cutting cycle, the feed rate F is set to 0.05mm / r, and the spindle speed is 800r / min. Pecking cutting is beneficial for chip breaking and removal, effectively reducing part deformation.

[0044] S4. Finish turn the first curved surface 102, the center hole 104, and the first rounding 103 to the required dimensions; the machining parameters are: feed rate F is set to 0.02mm / r, depth of cut is set to 0.05mm, and the spindle speed during cutting is 800r / min.

[0045] S5. Finish turn the outer diameter 101 and the transition fillet R1 between the first curved surface 102 and the outer diameter 101; the machining parameters are: feed rate F set to 0.02mm / r, depth of cut set to 0.02mm, and spindle speed during cutting is 800r / min. During machining, minimize the cutting force of the tool on the part to prevent deformation of the part.

[0046] S6. Finish turning the annular groove 105. Specifically, the machining parameters are as follows: use a grooving cutter with a width of 2.1mm, set the feed rate F to 0.02mm / r, and set the spindle speed to 200r / min during cutting; adopt a two-way splicing method during machining, first machine one side of the part cavity, and then machine the other side of the part cavity. Use different depths of cut during machining to prevent the part from deforming.

[0047] S7, the second fillet 107 of the rough-machined part, the state after machining is as follows: Figure 3 As shown. The purpose of rough turning the second rounding 107 is to reduce the machining allowance of the part after cutting, and to avoid possible deformation of the part in subsequent processing.

[0048] S8. Cutting: Cutting the part from the forging blank to obtain a semi-finished part;

[0049] S9. Clamp the semi-finished part obtained in step S8 using a clamping fixture, rough turn the second curved surface 106 on the other side of the part, leaving a margin; then finish turn the second curved surface 106 and the second fillet 107 to the required dimensions, and finish turn the transition fillet R2 between the second curved surface 106 and the outer circle 101. Specifically, the machining parameters are: after rough turning, leave a 0.2mm margin for finish turning; during finish turning, the feed rate F is set to 0.02mm / r, the depth of cut is set to 0.02mm, and the spindle speed is 800r / min.

[0050] Combination Figure 4 and Figure 5 As shown, the clamping fixture used in step S9 includes a base 3, a pressure plate 4, and bolts 2. A contour groove 301, opposite in shape to the first curved surface 102 and the first rounded surface 103 on the part, is provided on the base 3. Multiple threaded holes 303 are evenly distributed on the outer side of the contour groove 301 on the base 3. When clamping the semi-finished part, the machined first curved surface 102 and the first rounded surface 103 are placed and fitted onto the contour groove 301. One end of the pressure plate 4 extends into the annular groove 105 of the part, and the bolts 2 pass through the pressure plate 4 and are screwed into the threaded holes 303 of the base 3 to press the pressure plate 4 tightly, thus clamping the part. Furthermore, a boss 302 is provided on the top surface of the base 3. When clamping the semi-finished part, the boss 302 is inserted into the center hole 104 of the part for centering. A pad 5 is provided between the top surface of the base 3 and the pressure plate 4. The pad 5 extends to the side wall of the annular groove 105 of the part. The purpose of providing the pad 5 is to protect the inner side wall of the annular groove 105 on the part and prevent it from being crushed by the pressure plate 4.

[0051] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for machining thin-walled cavity sealing ring parts, characterized in that, Includes the following steps: S1. Clamp and position the forging blank, machine the first curved surface (102) and outer circle (101) on the part, and leave a margin; S2, Rough boring of center hole (104): Rough boring of center hole (104) and first rounding (103) between first curved surface (102) and center hole (104), leaving allowance; S3. Roughly machine the annular groove (105) on the part and leave a margin; S4. Grind the first curved surface (102), the center hole (104), and the first rounding (103) to the required dimensions; S5, finish turning the outer circle (101), and the transition fillet R1 between the first curved surface (102) and the outer circle (101); S6, finish turning the annular groove (105): use a grooving cutter with a width of 2.1mm, set the feed rate F to 0.02mm / r, and set the spindle speed to 200r / min during cutting; adopt a two-way splicing method during the machining process, first machine one side of the part cavity, and then machine the other side of the part cavity. Use different depths of cut during the machining process to prevent the part from deforming. S7, Second rounding of rough-machined parts (107); S8. Cutting: Cutting the part from the forging blank to obtain a semi-finished part; S9. Use a clamping fixture to clamp the semi-finished part obtained in step S8, rough machine the second curved surface (106) on the other side of the part, and leave a margin; then finish machine the second curved surface (106) and the second fillet (107) to the size, and finish machine the transition fillet R2 between the second curved surface (106) and the outer circle (101).

2. The processing method for a thin-walled cavity sealing ring part as described in claim 1, characterized in that, In step S9, the clamping fixture includes a base (3), a pressure plate (4), and a bolt (2); a contour groove (301) is provided on the base (3) that is opposite to the first curved surface (102) and the first rounded surface (103) on the part; a plurality of threaded holes (303) are evenly distributed on the base (3) at the outer position of the contour groove (301); when clamping the semi-finished part, the first curved surface (102) and the first rounded surface (103) that have been processed are placed and attached to the contour groove (301), one end of the pressure plate (4) extends into the annular groove (105) of the part, and the bolt (2) passes through the pressure plate (4) and is screwed into the threaded hole (303) of the base (3) to press the pressure plate (4) tight.

3. The processing method for a thin-walled cavity sealing ring part as described in claim 2, characterized in that, A boss (302) is provided on the top surface of the base (3). When the semi-finished part is clamped, the boss (302) is inserted into the center hole (104) of the part for centering.

4. A processing method for a thin-walled cavity sealing ring part as described in claim 2, characterized in that, A pad (5) is provided between the top surface of the base (3) and the pressure plate (4), the pad (5) extending to the side wall of the annular groove (105) of the part.

5. A processing method for a thin-walled cavity sealing ring part as described in claim 1, characterized in that, The allowance reserved in step S1 is 0.2mm; the allowance reserved in step S2 is 0.2mm; the allowance reserved in step S3 for rough machining of the annular groove (105) is 0.2mm.

6. A processing method for a thin-walled cavity sealing ring part as described in claim 1, characterized in that, In step S3, when rough turning the annular groove (105), a 3mm grooving tool is used, the CNC program uses G75 for a pecking cutting cycle, the feed rate F is set to 0.05mm / r, and the spindle speed is 800r / min during cutting.

7. A processing method for a thin-walled cavity sealing ring part as described in claim 1, characterized in that, In step S4, the feed rate F is set to 0.02 mm / r, the depth of cut is set to 0.05 mm, and the spindle speed during cutting is 800 r / min.

8. A method for processing a thin-walled cavity sealing ring part as described in claim 1, characterized in that, In step S5, when finishing the outer circle (101) and the transition fillet R1 between the first curved surface (102) and the outer circle (101), the feed rate F is set to 0.02 mm / r, the depth of cut is set to 0.02 mm, and the spindle speed during cutting is 800 r / min.

9. A processing method for a thin-walled cavity sealing ring part as described in claim 1, characterized in that, In step S9, after rough turning, a 0.2mm allowance is reserved for finish turning. During finish turning, the feed rate F is set to 0.02mm / r, the depth of cut is set to 0.02mm, and the spindle speed is 800r / min during cutting.

Images