Deformation control method for high-temperature alloy inner runner ring type casing

Abstract

The invention belongs to the field of aero-engines, and particularly relates to a deformation control method for a high-temperature alloy inner runner ring type casing. Reasonable planning is carried out in the aspects of a process route, a clamping mode, a cutting tool, a path and the like, the deformation control method of the inner runner ring type casing is mastered, and it is guaranteed that the profile tolerance and the size of a part runner face meet the requirements.

Description

Technical Field

[0001] The invention belongs to the field of aeroengines, and in particular relates to a method for controlling deformation of a high-temperature alloy inner flow channel ring casing. Background Art

[0002] At present, the inner channel ring casings are all made of high-temperature alloy materials, the blanks are forgings, and the final part surface is formed by machining. However, due to the complex structure of the inner channel ring casing, there are multiple grooves at the front and rear ends, all of which need to be formed by milling, and the material removal rate is more than 95%. At the same time, the wall thickness of the parts is thin, the rigidity is poor, and there are no installation edges at the front and rear ends, and there is no stable and reliable positioning reference. The processing process is affected by cutting stress, internal residual stress, and unbalanced clamping force. The parts are prone to large deformation, which affects the contour and size requirements of the part flow surface. At present, there is still no mature technology for deformation control of high-temperature alloy inner channel ring casings that can be used for reference. Summary of the invention

[0003] In view of the problems in the prior art, the present invention provides a method for controlling the deformation of a high-temperature alloy inner flow channel ring-type casing, and masters the method for controlling the deformation of the inner flow channel ring-type casing to ensure that the contour and size of the part flow channel surface meet the requirements.

[0004] The technical solution of the present invention is:

[0005] A method for controlling deformation of a high-temperature alloy inner flow channel ring casing comprises the following steps:

[0006] Step (1) forging;

[0007] Step (2) rough turning: remove most of the excess on the part surface, reserve process margins at the front and rear ends of the part, and leave 2.0-3.0 mm of excess for semi-finishing turning;

[0008] Step (3) stabilization treatment: removing the residual stress generated by the blank residue and rough machining;

[0009] Step (4) semi-finishing turning: After semi-finishing turning, a margin of 1.0 to 1.5 mm is left for finishing;

[0010] Step (5) Finishing the front end of the part: Through the two processes of finishing the front end of the part and finishing the front end of the part, the inner and outer surfaces of the front end of the part are processed in one clamping, avoiding the error caused by multiple clamping and alignment after the part is deformed, and ensuring that the wall thickness of the groove is Keep the ring structure of the front process edge of the part;

[0011] Step (6) Finishing the rear end of the part: This includes two processes: finishing the rear end of the part and finishing milling the rear end of the part. After finishing the front end of the part, the process edge of the rear end of the part is removed, and the inner and outer surfaces of the rear end of the part are processed in one clamping process to ensure that the clamping of the front end of the finishing and milling of the front end slots and holes is stable, reduce deformation caused by clamping errors, and ensure that the wall thickness of the rear end is

[0012] Step (7) Wire cutting process edge: After the rear end of the part is fine turned and milled, the front end of the part is wire cut to remove the process edge to ensure stable clamping of the rear end of the fine turning and milling of the rear end slots and holes.

[0013] Furthermore, the above-mentioned method for controlling deformation of a high-temperature alloy inner flow channel ring casing has a preferred embodiment in which the fine milling process of step (5) and step (6) adopts different processing methods and tool paths according to the groove, ear seat and ear seat upper hole of the inner flow channel ring casing parts, specifically:

[0014] The groove is processed by spiral milling + layered milling. First, a large-diameter alloy milling cutter is used to remove the excess by spiral milling, and the cutting depth of each circle is not more than 0.5mm. Then a Φ4 alloy milling cutter is used to perform finishing by layered milling, and the cutting depth of each layer is not more than 0.3mm to ensure the final contour requirements of the parts.

[0015] The ear seat is processed by horizontal milling, and axial force and tangential force are used during cutting to avoid cutting force along the center direction during vertical milling. At the same time, a Φ5 alloy milling cutter is used for layered milling, with a cutting depth of 0.3mm for each layer to reduce the deformation of the parts.

[0016] The holes on the ear seat are processed by spiral milling. A Φ6R0.5 alloy milling cutter is used to transform and reduce the axial cutting force during the spiral milling process. The spiral angle of each layer is 5°, which reduces the axial cutting force during the cutting process and reduces the deformation of parts.

[0017] Advantages and beneficial effects of the present invention:

[0018] 1. In the clamping method, the present invention ensures reliable clamping of parts finishing, increases system rigidity, and reduces part deformation by "reserving process edges at both the front and rear ends of the parts, removing the process edges at the rear end after the front end of the parts is finished, and removing the process edges at the front end by wire cutting after the rear end is finished".

[0019] 2. The present invention adopts spiral milling and high-speed layer milling cutting methods and tool paths for the grooves, ear seats and holes on the inner flow channel ring casing, respectively, and utilizes the characteristics of small cutting depth and low stress of layered milling and the characteristics of spiral milling conversion and reduced axial cutting force to reduce the cutting force in the cutting process and reduce the deformation of parts;

[0020] 3. The present invention has mastered the deformation control method of the inner flow channel ring casing by setting the process route, machining allowance, clamping method, cutting method, cutting tool and cutting path, ensuring that the part surface contour and size meet the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the rear end parts of the inner flow channel ring type casing in Example 1;

[0022] Figure 2 This is a schematic diagram of the process after rough turning and fine turning of the inner flow channel ring casing parts in Example 1;

[0023] Figure 3 This is a schematic diagram of spiral milling;

[0024] Figure 4 It is a schematic diagram of layered milling;

[0025] In the figure, 1-groove; 2-ear seat, 3-hole on the ear seat; 4-front end process edge; 5-rear end process edge. DETAILED DESCRIPTION

[0026] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but cannot be used to limit the scope of the present invention.

[0027] Example 1.

[0028] This embodiment provides a method for controlling deformation of a high-temperature alloy inner flow channel ring casing, targeting the rear end of a certain inner flow channel ring casing, such as Figure 1 As shown, the part is made of high-temperature alloy, the blank is a forging, the maximum outer diameter is Ф400mm, and the main wall thickness is 2mm. There are multiple grooves 1, ear seats 2 and ear seat upper holes 3 distributed at the front and rear ends of the part, and there is a boss inside the front end. The control method includes the following steps:

[0029] Step (1) Rough turning: remove most of the excess on the part surface, reserve process margins at the front and rear ends of the part, and leave a 2.0 mm margin for semi-finishing turning;

[0030] Step (3) stabilization treatment: removing the residual stress generated by the blank residue and rough machining;

[0031] Step (4) semi-finishing turning: After semi-finishing turning, a 1.0 mm margin is left for finishing;

[0032] Step (5) Finishing the front end of the part: Through the two processes of finishing the front end of the part and finishing the front end of the part, the inner and outer surfaces of the front end of the part are processed in one clamping, avoiding the error caused by multiple clamping and alignment after the part is deformed, and ensuring that the wall thickness of the groove is Keep the ring structure of the front process edge of the part;

[0033] like Figure 2 As shown, there is a front-end process edge 4 and a back-end process edge 5;

[0034] Step (6) Finishing the rear end of the part: This includes two processes: finishing the rear end of the part and finishing milling the rear end of the part. After finishing the front end of the part, the process edge of the rear end of the part is removed, and the inner and outer surfaces of the rear end of the part are processed in one clamping process to ensure that the clamping of the front end of the finishing and milling of the front end slots and holes is stable, reduce deformation caused by clamping errors, and ensure that the wall thickness of the rear end is

[0035] Step (7) Wire cutting process edge: After the rear end of the part is finely turned and milled, the front end process edge of the part is removed by wire cutting to ensure stable clamping of the rear end of fine turning and the rear end of milling slots and holes;

[0036] Among them, Figure 3 , Figure 4 As shown, the groove 1 is processed by spiral milling + layered milling. First, a large-diameter alloy milling cutter is used to remove the excess by spiral milling, and the cutting depth of each circle is 0.5mm. Then, a Φ4 alloy milling cutter is used to perform finishing by layered milling, and the cutting depth of each layer is 0.3mm to ensure the part surface profile requirement of 0.2.

[0037] The ear seat is processed by horizontal milling, and axial force and tangential force are used during cutting to avoid cutting force along the center direction during vertical milling. At the same time, a Φ5 alloy milling cutter is used for layered milling, with a cutting depth of 0.3mm for each layer to reduce the deformation of the parts.

[0038] The holes on the ear seat are processed by spiral milling. A Φ6R0.5 alloy milling cutter is used to transform and reduce the axial cutting force during the spiral milling process. The spiral angle of each layer is 5°, which reduces the axial cutting force during the cutting process and reduces the deformation of parts.

[0039] By using the method of this embodiment, the deformation of the part is controlled within 0.1 mm, ensuring the part profile of 0.2 and the dimensional tolerance of 0.1.

Claims

1. A method for controlling deformation of a high-temperature alloy inner flow channel ring casing, characterized in that: The following steps are involved: Step (1) Forging: high temperature alloy forging, hardness HBW≤241; Step (2) rough turning: remove most of the excess on the part surface, reserve process margins at the front and rear ends of the part, and leave 2.0-3.0 mm of excess for semi-finishing turning; Step (3) stabilization treatment: removing the residual stress generated by the blank residue and rough machining; Step (4) semi-finishing turning: After semi-finishing turning, a margin of 1.0 to 1.5 mm is left for finishing; Step (5) Finishing the front end of the part: Through the two processes of finishing the front end of the part and finishing the front end of the part, the inner and outer surfaces of the front end of the part are processed in one clamping, avoiding the error caused by multiple clamping and alignment after the part is deformed, and ensuring that the wall thickness of the groove is Keep the ring structure of the front process edge of the part; Step (6) Finishing the rear end of the part: This includes two processes: finishing the rear end of the part and finishing milling the rear end of the part. After finishing the front end of the part, the process edge of the rear end of the part is removed, and the inner and outer surfaces of the rear end of the part are processed in one clamping process to ensure that the clamping of the front end of the finishing and milling of the front end slots and holes is stable, reduce deformation caused by clamping errors, and ensure that the wall thickness of the rear end is Step (7) Wire cutting process edge: After the rear end of the part is fine turned and milled, the front end of the part is wire cut to remove the process edge to ensure stable clamping of the rear end of the fine turning and milling of the rear end slots and holes.

2. A method for controlling deformation of a high-temperature alloy inner flow channel ring casing according to claim 1, characterized in that: The finishing milling process of step (5) and step (6) adopts different processing methods and tool paths according to the groove, ear seat and ear seat upper hole of the inner flow channel ring casing parts, specifically: The groove is processed by spiral milling + layered milling. First, a large-diameter alloy milling cutter is used to remove the excess by spiral milling, and the cutting depth of each circle is not more than 0.5mm. Then a Φ4 alloy milling cutter is used to perform finishing by layered milling, and the cutting depth of each layer is not more than 0.3mm to ensure the part surface profile requirement of 0.

2. The ear seat is processed by horizontal milling, and axial force and tangential force are used during cutting to avoid cutting force along the center direction during vertical milling. At the same time, a Φ5 alloy milling cutter is used for layered milling, with a cutting depth of 0.3mm for each layer to reduce the deformation of the parts. The holes on the ear seat are processed by spiral milling. A Φ6R0.5 alloy milling cutter is used to transform and reduce the axial cutting force during the spiral milling process. The spiral angle of each layer is 5°, which reduces the axial cutting force during the cutting process and reduces the deformation of parts.

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