A machining fixture and clamping method for blade slots of an inner support assembly

Abstract

The application discloses a lathe machining clamp for a blade groove of an inner supporting assembly and a clamping method. The clamping method comprises the following steps: using the lathe machining clamp for the blade groove of the inner supporting assembly to realize the clamping process of the axial A reference surface, the B reference surface, the C reference surface, the E reference surface and the radial D reference surface of the inner supporting assembly, and the clamping process can compress and limit the vibration. The fixed position ring is in contact with the axial bottom A reference surface of the inner supporting assembly to support, the bottom of the fixed plate is in contact with the axial bottom B reference surface of the inner supporting assembly to compress, the top of the supporting column is in contact with the axial C reference surface of the outer side of the middle part of the inner supporting assembly to support, the compression surface of the supporting compression plate is in contact with the axial E reference surface of the inner supporting assembly to compress, the radial supporting surface of the supporting compression plate is in contact with the radial D reference surface of the inner supporting assembly to support, and the problem that the blade groove of the top overhanging part of the inner supporting assembly appears vibration during machining is solved.

Description

Technical Field

[0001] This invention relates to a machining fixture and clamping method for blade grooves of an internal support assembly, belonging to the field of aerospace parts machining technology. Background Technology

[0002] Internal support assembly ( Figure 1 The part numbered 25 is an important component of the high-pressure turbine guide vane, with a blade groove at its large end for supporting and clamping the guide vanes. Figure 1 (Ref. 26) The blade groove has high requirements for dimensional accuracy and shape tolerance. The outer circle roundness requirement of the large end is 0.025, the groove height tolerance is 0.039, the groove width tolerance is 0.04, and the parallelism requirement is 0.04. Figure 1 As shown. Furthermore, the internal support assembly is a large, thin-walled part with a maximum diameter exceeding Φ400mm and a minimum thickness of 1.2mm; when directly mounted on the machine tool spindle to machine the blade groove 26, it is prone to deformation exceeding tolerance due to severe vibration.

[0003] For existing vibration reduction technology in the machining of thin-walled parts, see Chinese Patent Publication No. CN106735309B, which discloses a deformation control method for CNC machining of long cantilever spoke structure parts. The disclosed technology is as follows: the anti-hook pressure plate and positioning block press the bottom of the mounting edge with an anti-hook, an auxiliary support ring is added at the blade shoulder, the pressing force on the bottom of the mounting edge is adjusted, the support below the inner hole of the spoke is driven by a spring, and the pressure cap on the upper end face of the inner hole of the spoke is pressed by a nut. Although the bottom and middle of the part can obtain pressing and limiting support, the top of the part is in a suspended state, and the blade groove 26 at the suspended part of the inner support assembly 25 still has the problem of vibration. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a machining fixture for the blade groove of the internal support component.

[0005] The present invention also provides a method for clamping the blade groove of the internal support assembly.

[0006] The present invention is achieved through the following technical solutions.

[0007] The present invention provides a clamping method for the blade groove of an inner support component, comprising: using a machining fixture for the blade groove of the inner support component to achieve a clamping process that presses and limits the vibration of the axial reference surface A, reference surface B, reference surface C, reference surface E and radial reference surface D of the inner support component.

[0008] A machining fixture for the blade groove of an internal support assembly includes:

[0009] Support base;

[0010] Support bolts are installed in the middle of the support base.

[0011] The fixed position ring with a through hole in the middle is installed on the top surface of the supporting base, and the supporting surface of the fixed position ring is in contact with the bottom A reference surface of the inner supporting assembly;

[0012] The supporting column is installed on the top surface of the supporting base, and the supporting column supports the outer side C reference surface of the middle part of the inner supporting assembly;

[0013] The fixed plate with a through hole in the middle is sleeved on the middle part of the supporting bolt through the middle through hole, and the bottom of the fixed plate is in contact and pressed against the B reference surface of the inner supporting assembly.

[0014] The supporting pressure plate with a through hole in the middle is sleeved on the supporting bolt, the radial supporting surface of the supporting pressure plate is in contact and supported with the D reference surface of the inner supporting assembly, the top of the inner supporting assembly is limited to obtain the contact and support of the radial supporting surface of the supporting pressure plate in the radial direction, and the pressing surface of the supporting pressure plate is in contact and pressed against the E reference surface of the inner supporting assembly, so that the top of the inner supporting assembly is limited to obtain the pressing support of the pressing surface of the supporting pressure plate in the axial direction.

[0015] The supporting bolt has external threads on the upper, middle and lower parts, the supporting base is provided with a supporting threaded hole in the middle, the external threads of the lower part of the supporting bolt are screwed into the supporting threaded hole provided in the middle of the supporting base, and the fixed plate nut is screwed into the external threads of the middle part of the supporting bolt to press the supporting bolt on the supporting base.

[0016] The middle part of the fixed position ring is sleeved on the supporting bolt, and the fixed plate nut is arranged in the middle through hole of the fixed position ring; the fixed position ring is provided with a screw hole B, which is screwed with a screw hole A provided on the supporting base through an assembly screw; the fixed position ring is provided with a pin hole, which is positioned and matched with a fixed pin hole provided on the supporting base through a fixed pin.

[0017] The supporting surface of the fixed position ring in contact with the bottom A reference surface of the inner supporting assembly is parallel to the top surface of the supporting base within 0.01.

[0018] The bottom of the supporting column has external threads, which are screwed into the fixed threaded hole provided on the supporting base, and the top of the supporting column is in contact and supported with the outer side C reference surface of the middle part of the inner supporting assembly.

[0019] The upper part of the fixed plate has a rotating washer sleeved on the supporting bolt, the middle part of the supporting bolt is screwed with a fixed plate nut to press the rotating washer, the rotating washer is screwed with the fixed plate through a fixed screw, the pressing force of the fixed plate nut is dispersed and pressed on the fixed plate by the rotating washer, and the bottom of the fixed plate is in contact and pressed against the B reference surface of the inner supporting assembly.

[0020] The fixed position ring is provided with a positioning outer circle corresponding to the inner diameter surface of the fixed plate to realize positioning of the outer diameter surface of the fixed plate and the inner diameter surface of the bottom of the inner supporting assembly.

[0021] The supporting pressure plate is pressed down by rotating and tightening the pressure plate nut on the outer threaded section of the upper part of the supporting bolt.

[0022] The beneficial effects of the present application are that the fixed position ring of the lathe clamping jig is in contact with the axial bottom A reference surface of the inner supporting assembly for support, the bottom of the fixed plate is in contact with the axial bottom B reference surface of the inner supporting assembly for pressure, the top of the supporting column is in contact with the axial C reference surface of the outer middle part of the inner supporting assembly for support, the pressure surface of the supporting pressure plate is in contact with the axial E reference surface of the inner supporting assembly for pressure, and the radial supporting surface of the supporting pressure plate is in contact with the radial D reference surface of the inner supporting assembly for support, so that the axial A reference surface, the B reference surface, the C reference surface, the E reference surface and the radial D reference surface of the inner supporting assembly are obtained for pressure and vibration limiting clamping process, and the problem of blade groove vibration at the top suspended part of the inner supporting assembly is solved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic view of the main section of the inner supporting assembly;

[0024] Figure 2 is a schematic view of the main section of the lathe clamping jig and the inner supporting assembly clamped by the present application;

[0025] Figure 3 is a schematic view of the main section of the supporting base of the present application;

[0026] Figure 4 is a schematic view of the main section of the fixed position ring of the present application;

[0027] Figure 5 is a schematic view of the main section of the supporting pressure plate of the present application;

[0028] In the figure: 1 - supporting base; 14 - weight reduction groove; 15 - supporting threaded hole; 16 - screw hole A; 17 - fixed threaded hole; 18 - fixed pin hole;

[0029] 2 - fixed position ring; 19 - supporting surface; 20 - screw hole B; 21 - positioning outer circle; 22 - pin hole;

[0030] 3 - fixed plate; 4 - supporting bolt;

[0031] 5 - supporting pressure plate; 23 - radial supporting surface; 24 - pressure surface;

[0032] 6 - fixed pin; 7 - rotating washer; 8 - fixed screw; 9 - fixed plate nut; 10 - fixed plate nut; 11 - assembly screw; 12 - supporting column; 13 - pressure plate nut; 25 - inner supporting assembly; 26 - blade groove. DETAILED DESCRIPTION

[0033] The technical solutions of the present application are further described below, but the scope of protection is not limited to the description.

[0034] As Figures 1 to 5 shown.

[0035] One kind of turning fixture of inner support assembly vane slot of the application, it includes:

[0036] Support base 1 is fixed in contact with machine tool spindle, support base 1 is cylindrical structure, support base 1 bottom has the lightening groove 14 of reducing the weight of fixture.

[0037] Support bolt 4 has external thread in three parts of upper, middle and lower, the external thread of support bolt 4 is combined in the support thread hole 15 arranged in the middle of support base 1 below; support bolt 4 is combined with fixed plate nut 10 below the external thread to make support bolt 4 press tightly on support base 1.

[0038] Fixed position ring 2 is provided with through hole in the middle, fixed position ring 2 is sleeved on support bolt 4 in the middle, fixed plate nut 10 is located in the middle through hole of fixed position ring 2, fixed position ring 2 is provided with screw hole B20 and is combined with screw hole A16 on support base 1 by assembling screw 11, the screw hole B20, assembling screw 11 and screw hole A16 are all distributed in six circumferential arrays;Fixed position ring 2 is provided with pin hole 22 and is positioned and cooperated with the fixed pin hole 18 arranged on support base 1 by fixed pin 6.The parallelism of the support surface 19 of the bottom A reference surface of inner support assembly 25 in contact with fixed position ring 2 relative to the top surface of support base 1 is within 0.01, which ensures good end face runout support.

[0039] Support column 12 supports the C reference surface of the middle outer side of inner support assembly 25, support column 12 bottom has external thread and is combined with fixed thread hole 17 arranged on support base 1, support column 12 top is in contact with the middle outer side C reference surface of inner support assembly 25 and supports;The fixed thread hole 17 and support column 12 are all distributed in six circumferential arrays.

[0040] Fixed plate 3 has through hole in the middle, fixed plate 3 is sleeved in the middle through hole in the middle of support bolt 4, rotating washer 7 is sleeved on support bolt 4 above fixed plate 3, rotating washer 7 is pressed tightly by fixed plate nut 9 combined in the middle external thread of support bolt 4, rotating washer 7 is combined with fixed plate 3 by fixed screw 8, rotating washer 7 disperses the pressing force of fixed plate nut 9 and presses down to fixed plate 3, the B reference surface of inner support assembly 25 is in contact and pressed tightly on the bottom of fixed plate 3, the positioning outer circle 21 arranged on fixed position ring 2 corresponds with the inner diameter surface positioning contact of fixed plate 3, which realizes the positioning of the outer diameter surface of fixed plate 3 and the inner diameter surface of the bottom of inner support assembly 25;Rotating washer 7 is combined with fixed plate 3 by fixed screw 8, which can also prevent rotating washer 7 from losing during transportation.

[0041] A support plate 5 with a through hole in the middle is fitted onto the external thread section of the support bolt 4. The support plate 5 is tightened and pressed down by the pressure plate nut 13 screwed onto the external thread section of the support bolt 4. The radial support surface 23 of the support plate 5 contacts and supports the inner support assembly 25 at the D reference surface, limiting the radial contact support of the top of the inner support assembly 25 with the radial support surface 23 of the support plate 5. The pressing surface 24 of the support plate 5 contacts and presses against the E reference surface of the inner support assembly 25, limiting the axial pressing support of the top of the inner support assembly 25 with the pressing surface 24 of the support plate 5.

[0042] The clamping force of the clamping surface 24 and the supporting force of the support column 12 work together to clamp and limit the axial vibration of the outer side of the top of the inner support assembly 25; the fixing plate 3 and the fixing ring 2 work together to clamp and limit the axial vibration of the outer side of the bottom of the inner support assembly 25; the radial support surface 23 of the support plate 5 limits the radial vibration of the inner side of the top of the inner support assembly 25, thereby achieving clamping and limiting vibration of the axial A reference surface, B reference surface, C reference surface, E reference surface and radial D reference surface of the inner support assembly 25, solving the problem of vibration blades appearing in the blade groove 26 of the suspended part at the top of the inner support assembly 25.

[0043] The present application discloses a clamping method for the blade groove of an inner support component, which includes: using a machining fixture for the blade groove of the inner support component to achieve a clamping process that presses and limits the vibration of the axial reference surface A, reference surface B, reference surface C, reference surface E and radial reference surface D of the inner support component 25, thereby solving the problem of vibration during machining of the blade groove 26 at the top of the inner support component 25.

[0044] The fixing ring 2 of the machining fixture contacts and supports the inner support assembly 25 at its axial bottom A reference surface. The bottom of the fixing plate 3 contacts and presses against the inner support assembly 25 at its axial bottom B reference surface. The top of the support column 12 contacts and supports the inner support assembly 25 at its middle outer axial C reference surface. The pressing surface 24 of the support plate 5 contacts and presses against the inner support assembly 25 at its axial E reference surface. The radial support surface 23 of the support plate 5 contacts and supports the inner support assembly 25 at its radial D reference surface.

Claims

1. A method of clamping a blade slot of an inner support assembly, characterized by, The application relates to a lathe clamping device for an inner supporting assembly vane slot. The lathe clamping device for the inner supporting assembly vane slot comprises the following parts: a supporting base (1); a supporting bolt (4) installed in the middle of the supporting base (1); a fixed position ring (2) with a through hole in the middle, which is installed on the top surface of the supporting base (1), and the supporting surface (19) of the fixed position ring (2) is in contact with the bottom A reference surface of the inner supporting assembly (25); a supporting column (12) installed on the top surface of the supporting base (1), which supports the outer C reference surface of the middle of the inner supporting assembly (25); a fixed plate (3) with a through hole in the middle, which is sleeved on the middle part of the supporting bolt (4) through the middle through hole, and the bottom of the fixed plate (3) is in contact with and presses the B reference surface of the inner supporting assembly (25); a supporting pressing plate (5) with a through hole in the middle, which is sleeved on the supporting bolt (4), the radial supporting surface (23) of the supporting pressing plate (5) is in contact with and supports the D reference surface of the inner supporting assembly (25), the top of the inner supporting assembly (25) is limited to be in contact with and supported by the radial supporting surface (23) of the supporting pressing plate (5) in the radial direction, the pressing surface (24) of the supporting pressing plate (5) is in contact with and presses the E reference surface of the inner supporting assembly (25), and the top of the inner supporting assembly (25) is limited to be pressed and supported by the pressing surface (24) of the supporting pressing plate (5) in the axial direction. The supporting bolt (4) has external threads in the upper, middle and lower parts, the supporting base (1) is provided with a supporting threaded hole (15) in the middle, the external threads of the lower part of the supporting bolt (4) are screwed into the supporting threaded hole (15) arranged in the middle of the supporting base (1), and the fixed plate nut (10) is screwed on the lower part of the supporting bolt (4) to press the supporting bolt (4) on the supporting base (1).

2. The method of claim 1, wherein: The fixed position ring (2) is sleeved on the supporting bolt (4), the fixed plate nut (10) is arranged in the middle through hole of the fixed position ring (2), the fixed position ring (2) is provided with a screw hole B (20) and is screwed with a screw hole A (16) arranged on the supporting base (1) through an assembly screw (11), and the fixed position ring (2) is provided with a pin hole (22) and is positioned and matched with a fixed pin hole (18) arranged on the supporting base (1) through a fixed pin (6).

3. The method of claim 1, wherein: The parallelism of the supporting surface (19) of the fixed position ring (2) in contact with the bottom A reference surface of the inner supporting assembly (25) relative to the top surface of the supporting base (1) is within 0.

01.

4. The method of claim 1, wherein: The bottom of the supporting column (12) has external threads and is screwed with a fixed threaded hole (17) arranged on the supporting base (1), and the top of the supporting column (12) is in contact with and supports the middle outer C reference surface of the inner supporting assembly (25).

5. The method of claim 1, wherein: ​ 6. The method of claim 1, wherein: The fixed plate (3) has a rotating washer (7) sleeved on the support bolt (4), the middle part of the support bolt (4) is externally threaded with a fixed plate nut (9) to press the rotating washer (7), the rotating washer (7) is screwed with the fixed plate (3) through a fixed screw (8), the rotating washer (7) disperses the pressing force of the fixed plate nut (9) and presses downward on the fixed plate (3), and the bottom of the fixed plate (3) contacts and presses the B reference surface of the inner support assembly (25).

7. The method of claim 1, wherein: The fixed position ring (2) is provided with a positioning outer circle (21) corresponding to the inner diameter surface of the fixed plate (3) for positioning contact, so that the outer diameter surface of the fixed plate (3) is positioned with the inner diameter surface of the bottom of the inner support assembly (25).

8. The method of claim 1, wherein: The support pressing plate (5) is pressed downward by a pressing plate nut (13) screwed on the outer threaded section of the upper part of the support bolt (4).

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