A processing method for arc sealing end gear ring parts

Abstract

The present invention relates to the field of aero-engine manufacturing technology, and in particular to a method for processing an arc-sealed end gear ring part, comprising the following steps: S1, preparing a blank: the blank is an annular forging; S2, fine turning: installing an adapter ring on the end face of the annular forging, and installing it on a CNC lathe through the adapter ring; fine turning the outer and inner circular surfaces of the part, leaving a grinding allowance on the outer circumference of the annular protrusion on the part, and cutting to obtain a fine-turned formed part; S3, processing an opening: cutting an opening on the fine-turned formed part to obtain a part with an opening; S4, heat treatment to remove stress; S5, fine grinding the outer circle of the annular protrusion. The processing method provided by the present invention effectively solves the problem of severe deformation of the part due to the clamping force of the three-jaw chuck in the traditional turning step, and by adding the step of heat treatment to remove stress and the step of fine grinding the outer circle of the annular protrusion after the heat treatment, the outer circle diameter requirement of the annular protrusion is effectively guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of aviation engine manufacturing, and in particular to a method for processing an arc sealing end gear ring part. Background Art

[0002] The arc sealing end gear ring part is a sealing ring part in the high-pressure turbine rotor. This type of sealing ring part is widely used in aircraft engines.

[0003] Combine Figures 1 to 3 The figure shows the structure of a certain type of arc sealing end gear ring part. The material of the part is GH4169, and there is an opening 100 on the part. The width of the opening 100 is required to be The outer surface of the part is provided with a circle of annular protrusions 102. According to the assembly relationship, the outer surface of the annular protrusion 102 is a high-precision working surface with a diameter requirement of The outer surface of the annular protrusion 102 needs to ensure that it meets the light transmission requirements of the corresponding working surface in the tooling clamp of corresponding size.

[0004] The arc-shaped sealing end gear ring component is made from a ring-shaped forging. Traditionally, this is done by turning the part directly using a three-jaw chuck on a lathe, clamping it on its outer circumference. However, since the part's outer diameter is larger than 200 mm, the clamping force of the three-jaw chuck causes significant deformation during turning. Furthermore, after the finish-turned part is cut, it springs open due to stress release. Therefore, finish turning alone cannot guarantee the required outer diameter of the annular protrusion 102. Summary of the Invention

[0005] The main purpose of the present invention is to provide a method for processing an arc sealing end gear ring part, aiming to solve the above technical problems.

[0006] To achieve the above object, the present invention provides a method for processing an arc sealing end gear ring component, comprising the following steps:

[0007] S1. Prepare the raw material: the raw material is a ring forging;

[0008] S2, Finish Turning: Install an adapter ring on the end face of the annular forging and install it on a CNC lathe through the adapter ring; finish turn the outer and inner circular surfaces of the part, leaving a grinding allowance on the outer circumference of the annular protrusion on the part, and cut off to obtain the finish turned part;

[0009] S3, machining openings: cutting openings on the precision-turned parts to obtain parts with openings;

[0010] S4, heat treatment to relieve stress;

[0011] S5. Finely grind the outer circle of the annular protrusion.

[0012] Preferably, the adapter ring includes a clamping part and a plug-in part, the plug-in part is integrally formed on the right end face of the clamping part, and four screw through holes are evenly distributed in a ring on the clamping part; in the step S1, when preparing the rough material, the end face and inner hole of the ring forging are rough-turned, and four threaded holes are processed on the left end face of the ring forging; in the step S2, when the ring forging and the adapter ring are assembled, the plug-in part of the adapter ring is inserted into the inner hole of the ring forging, and the right end face of the clamping part is abutted against the left end face of the ring forging, and the screw is passed through the screw through hole of the adapter ring and tightened in the threaded hole of the ring forging; the three-jaw chuck of the CNC lathe is clamped on the outer peripheral surface of the clamping part.

[0013] Preferably, in step S4, vacuum heat treatment is used to remove stress. After the parts are placed in the furnace, heating is started when the pressure P≤13.3Pa, and the temperature is controlled at 550℃±10℃ and maintained for 4 hours for stress relief treatment.

[0014] Preferably, in step S5, when fine-grinding the outer circle of the annular protrusion, a copper plug is used to be stuck in the opening, and the thickness of the copper plug is equal to the designed width T of the opening.

[0015] Preferably, in step S5, when fine-grinding the outer circle of the annular protrusion, an end face pressing tool is used to press the two ends of the part before grinding.

[0016] Preferably, the end face clamping tooling includes a core shaft and a clamping plate; the core shaft is a stepped shaft, which includes a clamping section, a part installation section and a screw section from left to right, and an annular stop is provided on the part installation section; a threaded hole is provided in the center of the clamping plate; in step S5, when the part is clamped, the part is sleeved on the annular stop, the left end face of the part rests on the step surface of the annular stop, and the clamping plate is screwed on the screw section and presses the right end face of the part.

[0017] Preferably, a top hole is provided on the end surface of the clamping section and the end surface of the screw section respectively.

[0018] Preferably, before using the end face clamping tool to clamp and clamp the part, it is necessary to perform a coloring inspection on both end faces of the part. If three high coloring points appear, it means that the end face of the part has been deformed during the heat treatment process and the end face of the part needs to be ground.

[0019] Preferably, the method for grinding the end face of a part is: clamping the part with a grinding cover and grinding the end face of the part; a countersink is provided on the top surface of the grinding cover; when grinding the end face of the part, the part is placed flat in the countersink, and the inner hole surface of the countersink fits with the outer peripheral surface of the annular protrusion on the part.

[0020] Preferably, step S6, light transmission inspection, is also included: a tool clamp is used to perform a light transmission inspection on the parts after fine grinding in step S5, and the inspection method is: a detection through hole is provided on the tool clamp, and the diameter of the detection through hole is the same as the design value of the outer diameter of the annular protrusion on the part; the part is installed in the detection through hole of the tool clamp, and the outer peripheral surface of the annular protrusion is matched with the detection through hole, and a light transmission inspection is performed after assembly is completed.

[0021] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0022] (1) By adopting the machining method provided by the present invention, an adapter ring is installed on the end face of the annular forging during fine turning, and the forging is mounted on a CNC lathe via the adapter ring, effectively solving the problem of severe deformation of the part due to the clamping force of the three-jaw chuck during traditional turning. In this method, by adding the steps of heat treatment for stress relief and fine grinding the outer diameter of the annular protrusion after the heat treatment, the outer diameter requirement of the annular protrusion is effectively guaranteed.

[0023] (2) The processing method provided by the present invention can effectively realize the positioning, clamping and elimination of partial deformation of parts, and each step enables the final state of the parts to be effectively controlled within the range allowed by the design. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the arc sealing end gear ring parts;

[0026] Figure 2 It is a cross-sectional view of the gear ring part at the arc sealing end;

[0027] Figure 3 Schematic diagram of the opening on the arc sealing end gear ring part;

[0028] Figure 4 is a schematic diagram of the ring forging in the present invention;

[0029] Figure 5 This is a front view of the adapter ring of the present invention;

[0030] Figure 6 for Figure 5 Middle AA section view;

[0031] Figure 7This is a schematic diagram of the adapter ring and the annular forging in the present invention when they are about to be matched;

[0032] Figure 8 This is a schematic diagram of the structural decomposition of the end face pressing tool in the present invention;

[0033] Figure 9 This is a schematic diagram of the present invention when using end face pressing tooling to clamp parts;

[0034] Figure 10 This is a top view of the grinding cover of the present invention;

[0035] Figure 11 for Figure 10 Middle BB cross-section view.

[0036] Explanation of the accompanying figures: 1. Annular forging; 1a. Threaded hole; 2. Adapter ring; 2a. Clamping part; 2b. Inserting part; 3. Mandrel; 3a. Clamping section; 3b. Parts mounting section; 3c. Screw section; 3d. Annular stop; 3e. Center hole; 4. Clamping plate; 5. Grinding cover; 5a. Countersunk hole; 100. Opening; 102. Annular protrusion. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] As shown in the accompanying drawings, a specific embodiment of a method for processing an arc sealing end gear ring part provided by the present invention is provided. The processing method includes the following steps:

[0040] S1. Prepare the raw material: the raw material is a ring forging 1;

[0041] S2, Finish Turning: Install an adapter ring 2 on the end face of the annular forging 1 and mount it on a CNC lathe via the adapter ring 2; finish turn the outer and inner circular surfaces of the part, leaving a grinding allowance on the outer circumference of the annular protrusion 102 on the part, and cut off to obtain a finish turned part;

[0042] S3, machining an opening: cutting an opening 100 on the precision-turned part to obtain a part with the opening 100;

[0043] S4, heat treatment to relieve stress;

[0044] S5. Fine grinding the outer circle of the annular protrusion 102.

[0045] Combine Figures 4 to 7 As shown, the adapter ring 2 includes a clamping portion 2a and an inserting portion 2b, the inserting portion 2b is integrally formed on the right end face of the clamping portion 2a, and four screw through holes 2c are evenly distributed in a ring on the clamping portion 2a; in the step S1, when preparing the rough material, the end face and inner hole of the ring forging 1 are rough-turned, and four threaded holes 1a are machined on the left end face of the ring forging 1; in the step S2, when the ring forging 1 and the adapter ring 2 are assembled, the inserting portion 2b of the adapter ring 2 is inserted into the inner hole of the ring forging 1, and the right end face of the clamping portion 2a is abutted against the left end face of the ring forging 1, and the screw is passed through the screw through hole 2c of the adapter ring 2 and then tightened in the threaded hole 1a of the ring forging 1; the three-jaw chuck of the CNC lathe is clamped on the outer peripheral surface of the clamping portion 2a.

[0046] In this embodiment, the material of the part is GH4169. Since the hardness requirement is met when the part is sent to the vacuum heat treatment, the various parameter conditions of the vacuum heat treatment cannot change the hardness of the part, so only a lower heat treatment temperature can be used. Therefore, in the step S4, vacuum heat treatment is used to remove stress. After the part is placed in the furnace, heating begins when the pressure P≤13.3Pa, and the temperature is controlled at 550℃±10℃ for 4 hours to perform stress relief treatment.

[0047] In this embodiment, in step S5, when fine grinding the outer circle of the annular protrusion 102, a copper plug is used to be stuck in the opening 100, and the thickness of the copper plug is equal to the design width T of the opening 100. Specifically, the design width of the opening 100 is The thickness of the copper plug is the same as T.

[0048] Combine Figure 8 、 Figure 9As shown, in step S5, when fine-grinding the outer diameter of the annular protrusion 102, an end face pressing tool is used to press the two ends of the part before grinding. Specifically, the end face pressing tool includes a mandrel 3 and a pressing plate 4. The mandrel 3 is a stepped shaft, and from left to right, it includes a clamping section 3a, a part mounting section 3b, and a screw section 3c. The part mounting section 3b is provided with an annular stop 3d. The center of the pressing plate 4 is provided with a threaded hole. In step S5, when clamping the part, the part is inserted into the annular stop 3d, with the left end face of the part resting on the stepped surface of the annular stop 3d. The pressing plate 4 is screwed onto the screw section 3c and presses the right end face of the part. Furthermore, a top hole 3e is provided on the end face of the clamping section 3a and the end face of the screw section 3c.

[0049] In this embodiment, before clamping and pressing the part using the end-face clamping fixture, both end faces of the part are color-checked. If three high color spots are present, this indicates deformation during the heat treatment process and requires grinding. If this unevenness is not corrected, the part will vibrate during grinding in the end-face clamping fixture, potentially leading to serious damage.

[0050] Combine Figure 10 、 Figure 11 As shown, the method for grinding the end face of a part is as follows: a grinding cover 5 is used to clamp the part and grind the end face of the part; a countersink 5a is provided on the top surface of the grinding cover 5; when grinding the end face of the part, the part is placed flat in the countersink 5a, and the inner surface of the countersink 5a fits the outer peripheral surface of the annular protrusion 102 on the part. Specifically, the diameter φB of the countersink 5a matches the outer diameter of the annular protrusion 102 on the part after fine turning in step S2. In step S2, the outer peripheral surface of the annular protrusion 102 on the part has a grinding allowance of 0.15mm per side, so the diameter φB of the countersink 5a is designed to be The depth H of the countersunk hole 5a is The grinding cover 5 is used to clamp the parts, which makes it easier for the fitter to grind the parts to eliminate the problem of high points on the end faces of the parts.

[0051] In this embodiment, the processing method further includes step S6, light transmission inspection: a tooling collar is used to perform light transmission inspection on the part after fine grinding in step S5. The inspection method is as follows: a detection through hole is provided on the tooling collar, and the diameter of the detection through hole is the same as the design value of the outer diameter of the annular protrusion 102 on the part, that is, the diameter of the detection through hole is The part is installed in the inspection hole of the fixture collar, with the outer surface of the annular protrusion 102 aligned with the inspection hole. After assembly, a light transmission inspection is performed. The clearance within a total circumferential range of no more than 60° must not exceed 0.02mm. Alternatively, when the part and the inspection hole of the fixture collar partially align in the circumferential direction, the remaining circumferential clearance must be within 0.005mm. If these requirements are met, the part passes; otherwise, it fails.

[0052] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A method for processing arc sealing end gear ring parts, characterized in that: The following steps are involved: S1. Preparing a raw material: the raw material is a ring forging (1); S2, fine turning: installing an adapter ring (2) on the end face of the annular forging (1), and installing it on a CNC lathe through the adapter ring (2); fine turning the outer and inner circular surfaces of the part, leaving a grinding allowance on the outer circumference of the annular protrusion (102) on the part, and cutting to obtain a fine turned part; S3, machining an opening: cutting an opening (100) on the precision-turned part to obtain a part with an opening (100); S4, heat treatment to relieve stress; S5, fine grinding the outer circle of the annular protrusion (102); In the step S5, when finely grinding the outer circle of the annular protrusion (102), a copper plug is clamped in the opening (100), and the thickness of the copper plug is equal to the designed width T of the opening (100).

2. A method for processing an arc sealing end gear ring component according to claim 1, characterized in that: The adapter ring (2) comprises a clamping portion (2a) and an inserting portion (2b), wherein the inserting portion (2b) is integrally formed on the right end surface of the clamping portion (2a), and four screw holes (2c) are evenly distributed in a ring shape on the clamping portion (2a); In the step S1, when preparing the raw material, the end face and inner hole of the ring forging (1) are rough-turned, and four threaded holes (1a) are machined on the left end face of the ring forging (1); In step S2, when the annular forging (1) and the adapter ring (2) are assembled, the plug-in portion (2b) of the adapter ring (2) is inserted into the inner hole of the annular forging (1), the right end face of the clamping portion (2a) is pressed against the left end face of the annular forging (1), and a screw is passed through the screw through hole (2c) of the adapter ring (2) and then screwed into the threaded hole (1a) of the annular forging (1); and the three-jaw chuck of the CNC lathe is clamped on the outer peripheral surface of the clamping portion (2a).

3. A method for processing an arc sealing end gear ring component according to claim 1, characterized in that: In step S4, vacuum heat treatment is used to remove stress. After the parts are placed in the furnace, heating is started when the pressure P≤13.3Pa, and the temperature is controlled at 550℃±10℃ and maintained for 4 hours to perform stress removal treatment.

4. A method for processing an arc sealing end gear ring component according to claim 1, characterized in that: In step S5, when fine-grinding the outer circle of the annular protrusion (102), an end face pressing tool is used to press the two ends of the part before grinding.

5. A method for processing an arc sealing end gear ring component according to claim 4, characterized in that: The end face pressing fixture comprises a core shaft (3) and a pressing plate (4); the core shaft (3) is a stepped shaft, and comprises, from left to right, a clamping section (3a), a part installation section (3b) and a screw section (3c), and an annular stop (3d) is provided on the part installation section (3b); a threaded hole is provided at the center of the pressing plate (4); In step S5, when the part is clamped, the part is sleeved on the annular stop (3d), the left end face of the part abuts against the step surface of the annular stop (3d), and the clamping plate (4) is screwed onto the screw segment (3c) and presses the right end face of the part.

6. A method for processing an arc sealing end gear ring component according to claim 5, characterized in that: A top hole (3e) is respectively provided on the end surface of the clamping section (3a) and the end surface of the screw section (3c).

7. A method for processing an arc sealing end gear ring component according to claim 4, characterized in that: Before using the end face clamping tool to clamp and clamp the parts, it is necessary to perform a coloring inspection on both end faces of the parts. If three high coloring points appear, it means that the end face of the part has been deformed during the heat treatment process and the end face of the part needs to be ground.

8. A method for processing an arc sealing end gear ring component according to claim 7, characterized in that: The method for grinding the end face of a part is as follows: clamping the part with a grinding cover (5) and grinding the end face of the part; a countersunk hole (5a) is provided on the top surface of the grinding cover (5); When grinding the end face of a part, the part is placed flat in the countersunk hole (5a), and the inner surface of the countersunk hole (5a) fits with the outer peripheral surface of the annular protrusion (102) on the part.

9. A method for processing an arc sealing end gear ring component according to claim 1, characterized in that: The method further includes step S6, light transmission inspection: using a tooling collar to perform light transmission inspection on the part after fine grinding in step S5, the inspection method is as follows: a detection through hole is provided on the tooling collar, the diameter of the detection through hole is the same as the design value of the outer diameter of the annular protrusion (102) on the part; the part is installed in the detection through hole of the tooling collar, and the outer peripheral surface of the annular protrusion (102) is matched with the detection through hole, and light transmission inspection is performed after the assembly is completed.

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