Machining method of arc sealing end gear ring part

Abstract

The invention relates to the technical field of aero-engine manufacturing, in particular to a machining method of an arc sealing end gear ring part, which comprises the following steps: S1, preparing a blank which is an annular forge piece; s2, finish turning is conducted, specifically, an adapter ring is installed on the end face of the annular forge piece, and the annular forge piece is installed on a numerical control lathe through the adapter ring; the outer circular surface and the inner circular surface of the part are subjected to finish turning, the grinding allowance is reserved on the outer circumferential surface of the annular protrusion on the part, and the part subjected to finish turning forming is obtained through cutting off; s3, opening machining, wherein an opening is cut in the part formed through finish turning, and a part with the opening is obtained; s4, performing heat treatment to remove stress; and S5, the outer circle of the annular protrusion is finely ground. By the adoption of the machining method, the problem that in a traditional turning step, a part is seriously deformed due to the clamping force of a three-jaw chuck is effectively solved, and the requirement for the diameter of the outer circle of the annular protrusion is effectively met by adding the step of heat treatment stress removal and adding the step of accurate grinding of the outer circle of the annular protrusion after heat treatment.

Description

Technical Field

[0001] The invention relates to the technical field of aeroengine 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] Combination 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 an opening 100 is provided 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 circumferential 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 ring of corresponding size.

[0004] The arc sealing end gear ring parts are made of annular forgings. In the traditional processing method, the three-jaw chuck on the lathe is directly used to clamp the outer circumference of the raw material for turning. Since the outer diameter of the part is greater than φ200mm, the part is severely deformed due to the clamping force of the three-jaw chuck during the turning process. In addition, after the part is cut open by fine turning, the part will bounce open due to stress release. Therefore, the outer diameter requirement of the annular protrusion 102 cannot be guaranteed by fine turning alone. Summary of the invention

[0005] The main purpose of the present invention is to provide a processing method for 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 part, comprising the following steps:

[0007] S1. Prepare the raw material: the raw material is an annular forging;

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

[0009] S3, processing opening: cutting an opening on the fine-turned part to obtain a part with an opening;

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

[0013] Preferably, in step S4, vacuum heat treatment is used to remove stress. After the parts are put into the furnace, heating is started when the vacuum pressure P≤13.3Pa, and the temperature is controlled at 550℃±10℃ for 4 hours to perform stress removal 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 clamping tool is used to clamp both ends of the part before grinding.

[0016] Preferably, the end face clamping tooling includes a central shaft and a clamping plate; the central shaft is a stepped shaft, and includes, from left to right, a clamping section, a part installation section and a screw section, 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 respectively provided on the end surface of the clamping section and the end surface of the screw section.

[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 colored high 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: the part is clamped with a grinding cover to grind the end face of the part; a countersunk hole 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 countersunk hole, and the inner hole surface of the countersunk hole fits with the outer peripheral surface of the annular protrusion on the part.

[0020] Preferably, the method further includes step S6, a light transmission inspection: using a tooling clamp ring to perform a light transmission inspection on the parts after fine grinding in step S5, and the inspection method is as follows: a detection through hole is provided on the tooling clamp ring, 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 tooling clamp ring, and the outer peripheral surface of the annular protrusion cooperates 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 processing method provided by the present invention, during fine turning, an adapter ring is installed on the end face of the annular forging, and the forging is installed on a CNC lathe through the adapter ring, which effectively solves the problem of serious deformation of the part due to the clamping force of the three-jaw chuck in the traditional turning step. In this method, by adding a step of heat treatment to relieve stress and adding a 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.

[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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

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

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

[0027] Figure 3 It is a schematic diagram of the opening on the arc sealing end gear ring part;

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

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

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

[0031] Figure 7It 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 It is a schematic diagram of the structural decomposition of the end face pressing tool in the present invention;

[0033] Fig. 9 It is a schematic diagram of clamping a part using an end face clamping tool in the present invention;

[0034] Fig.10 It is a top view of the structure of the grinding cover in the present invention;

[0035] Fig.11 for Fig.10 Middle BB section view.

[0036] Explanation of the accompanying drawings: 1. annular forging; 1a. threaded hole; 2. adapter ring; 2a. clamping part; 2b. plug-in part; 3. spindle; 3a. clamping section; 3b. part installation section; 3c. screw section; 3d. annular stop; 3e. top hole; 4. clamping plate; 5. grinding cover; 5a. countersunk hole; 100. opening; 102. annular protrusion. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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 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 comprises the following steps:

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

[0041] S2, fine turning: installing an adapter ring 2 on the end surface of the annular forging 1, and installing it on a CNC lathe through the adapter ring 2; fine turning the outer cylindrical surface and the inner cylindrical surface of the part, leaving a grinding allowance on the outer peripheral surface of the annular protrusion 102 on the part, and cutting to obtain a fine turning formed part;

[0042] S3, processing the opening: cutting an opening 100 on the fine-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] Combination 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 shape on the clamping portion 2a; in the step S1, when preparing the rough material, the end face and the inner hole of the ring forging 1 are rough-turned, and four threaded holes 1a are processed 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 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 step S4, vacuum heat treatment is used to remove stress. After the part enters the furnace, heating begins when the vacuum pressure P≤13.3Pa, and the temperature is controlled at 550℃±10℃ for 4 hours to perform stress removal 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 clamp 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] Combination Figure 8 , Fig. 9As shown, in step S5, when fine grinding the outer circle of the annular protrusion 102, an end face clamping tool is used to clamp the two ends of the part before grinding. Specifically, the end face clamping tool includes a mandrel 3 and a clamping plate 4; the mandrel 3 is a stepped shaft, which includes a clamping section 3a, a part installation section 3b and a screw section 3c from left to right, and an annular stop 3d is provided on the part installation section 3b; a threaded hole is provided in the center of the clamping plate 4; in step S5, when clamping the part, 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 on the screw section 3c and clamps 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, respectively.

[0049] In this embodiment, before the end face clamping tool is used to clamp and clamp the part, it is necessary to color check the two end faces of the part. If three color high 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. If the problem of uneven end face is not eliminated, the part will vibrate when clamped on the end face clamping tool for grinding, and even cause serious consequences such as collapse.

[0050] Combination Fig.10 , Fig.11 As shown, the method for grinding the end face of the part is: the part is clamped with a grinding cover 5 to grind the end face of the part; the top surface of the grinding cover 5 is provided with a countersink 5a; when grinding the end face of the part, the part is placed flat in the countersink 5a, and the inner hole 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 0.15 mm on one 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, so that the fitter can grind them to eliminate the problem of high points of deformation on the end faces of the parts.

[0051] In this embodiment, the processing 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: a detection through hole is set 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 detection hole of the tooling collar, and the outer circumference of the annular protrusion 102 matches the detection hole. After assembly, a light inspection is performed. It is required that the gap within the total circumference of no more than 60° does not exceed 0.02mm, or when the part and the detection hole of the tooling collar are partially fitted in the circumferential direction, the remaining circumferential gap range is within 0.005. If the above requirements are met, the part is qualified, otherwise it is unqualified.

[0052] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes 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 are 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-shaped forging (1); S2, fine turning: installing an adapter ring (2) on the end surface of the annular forging (1), and installing it on a CNC lathe through the adapter ring (2); fine turning the outer cylindrical surface and the inner cylindrical surface of the part, leaving a grinding allowance on the outer peripheral surface of the annular protrusion (102) on the part, and cutting to obtain a fine turned formed part; S3, processing the opening: cutting an opening (100) on the fine-turned part to obtain a part with the opening (100); S4, heat treatment to relieve stress; S5. Fine grinding the outer circle of the annular protrusion (102).

2. A method for processing an arc sealing end gear ring part as claimed in 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 part as claimed in claim 1, characterized in that: In step S4, vacuum heat treatment is used to remove stress. After the parts are put into the furnace, heating begins when the vacuum pressure P≤13.3Pa, and the temperature is controlled at 550℃±10℃ for 4 hours to remove stress.

4. A method for processing an arc sealing end gear ring part as claimed in claim 1, characterized in that: In the step S5, when fine grinding the outer circle of the annular protrusion (102), a copper plug is used to clamp in the opening (100), and the thickness of the copper plug is equal to the designed width T of the opening (100).

5. A method for processing an arc sealing end gear ring part as claimed in claim 1, characterized in that: In step S5, when fine grinding the outer circle of the annular protrusion (102), an end face clamping tool is used to clamp the two ends of the part before grinding.

6. A method for processing an arc sealing end gear ring part as claimed in claim 5, characterized in that: The end face clamping tool comprises a mandrel (3) and a clamping plate (4); the mandrel (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 clamping 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.

7. A method for processing an arc sealing end gear ring part as claimed in claim 6, characterized in that: A top hole (3e) is respectively arranged on the end surface of the clamping section (3a) and the end surface of the screw section (3c).

8. A method for processing an arc sealing end gear ring part as claimed in claim 5, characterized in that: Before using the end face clamping tool to clamp and clamp the parts, it is necessary to color check the two 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.

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

10. A method for processing an arc sealing end gear ring part as claimed in claim 1, characterized in that: The method further comprises 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 being as follows: a detection through hole is provided on the tooling collar, the diameter of the detection through hole being 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 a light transmission inspection is performed after the assembly is completed.

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