CN115488660A - Accurate clamping and positioning fixture for large thin-wall hollow blade-type cast part and milling method - Google Patents

Accurate clamping and positioning fixture for large thin-wall hollow blade-type cast part and milling method Download PDF

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Publication number
CN115488660A
CN115488660A CN202211306763.XA CN202211306763A CN115488660A CN 115488660 A CN115488660 A CN 115488660A CN 202211306763 A CN202211306763 A CN 202211306763A CN 115488660 A CN115488660 A CN 115488660A
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China
Prior art keywords
support
auxiliary
sliding
base
plate
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CN202211306763.XA
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Chinese (zh)
Inventor
张恩元
杨海涛
王峰
柳连涛
马亮
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AECC Shenyang Liming Aero Engine Co Ltd
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AECC Shenyang Liming Aero Engine Co Ltd
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Priority to CN202211306763.XA priority Critical patent/CN115488660A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/06—Work-clamping means
    • B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor

Abstract

The large-scale thin-wall hollow blade-type casting part accurate clamping and positioning fixture comprises a base for supporting an upper structure, wherein a floating pressure plate assembly, a first auxiliary supporting assembly, a second auxiliary supporting assembly, a bottom datum and a bottom auxiliary support are respectively installed on the base through bolts, the floating pressure plate assembly and the first auxiliary supporting assembly are located at one end of the upper surface of the base and are arranged right opposite to each other, the bottom datum and the bottom auxiliary support are installed on the base between the floating pressure plate assembly and the first auxiliary supporting assembly, and the second auxiliary supporting assembly which is arranged right opposite to the bottom datum is installed at the other end of the upper surface of the base. The difficult problems of difficult clamping and positioning, easy deformation and vibration of the parts are solved. The milling quality precision of the parts is ensured, and the consistency and the processing efficiency of products are improved.

Description

Accurate clamping and positioning fixture for large thin-wall hollow blade-type cast part and milling method
Technical Field
The invention belongs to the technical field of auxiliary tools for machining large thin-wall hollow blade-type cast parts, and particularly relates to a precise clamping and positioning clamp and a milling method for large thin-wall hollow blade-type cast parts.
Background
In the milling process of large thin-wall hollow blade-shaped cast parts, the problems of difficult positioning, large deformation, serious vibration in the processing process, easy out-of-tolerance of the milling size of the parts, easy deformation of the parts and poor product consistency caused by the complex blade surface, thin wall thickness, poor rigidity, relatively large tolerance of the external casting size of the parts, poor consistency and the like often occur.
Disclosure of Invention
The invention aims to provide a large-scale thin-wall hollow blade-type casting part accurate clamping and positioning fixture and a milling method, and solves the problems of difficult clamping and positioning, easy deformation and vibration of parts. The milling quality precision of the parts is ensured, and the consistency and the processing efficiency of the product are improved.
The utility model provides a hollow profile casting part of large-scale thin wall accurate clamping positioning fixture, is including the base that is used for supporting superstructure, install unsteady clamp plate subassembly, first auxiliary stay subassembly, second auxiliary stay subassembly, bottom benchmark and bottom auxiliary stay respectively through the bolt on the base, unsteady clamp plate subassembly and first auxiliary stay subassembly are located base upper surface one end and both just to setting up, install bottom benchmark and bottom auxiliary stay on the base between the two, install the second auxiliary stay subassembly just to setting up with the bottom benchmark at the base upper surface other end.
The floating pressing plate assembly comprises an upright seat I, the bottom end of the upright seat I is fixedly installed on the base through bolts, a sliding groove is formed in the top of the upright seat I, a long sliding block is installed in the sliding groove, the front end of the long sliding block is connected with a connecting rod, floating pressing plates are installed at the two ends of the connecting rod respectively, the floating pressing plates are fixed on the connecting rod through nuts, the rear end of the long sliding block is connected with the end part of a screw of a lateral pressing screw in a rotating mode, a top plate and a rear plate sealing sliding groove are installed on the top of the upright seat I and the rear side wall respectively, the rear plate is connected with the lateral pressing screw in a threaded mode, the lateral pressing screw is pushed to slide in the sliding groove through rotation, and then the floating pressing plates are pushed to compress blade profiles.
The connecting rod is located in the U-shaped seat, and the connecting rod is fixed on the U-shaped seat through a bolt in a threaded nut at the end of the bolt after the bolt penetrates through the through hole of the U-shaped seat and the through hole of the connecting rod.
The bottom datum is two, the two bottom datums are arranged face to face, the cross section of the bottom datum is L-shaped, the bottom datum is fixedly installed on the base through a horizontal part and a bolt, and the top of a vertical part of the bottom datum is processed into an arc surface to form a positioning datum point.
The bottom auxiliary support is a support screw, a screw rod part of the bottom auxiliary support is screwed on the base, and a screw cap part of the bottom auxiliary support forms an auxiliary support.
First auxiliary stay is including founding seat II, it passes through bolt fixed mounting on the base to found II bottoms of seat, the counter sink has been seted up at II tops of founding seat, the screw hole is processed into to the aperture of counter sink, the cylinder end of top surface clamp plate is installed in the macropore of counter sink, top surface clamp screw passes the through-hole of top surface clamp plate cylinder end and the aperture threaded connection of counter sink, and install the spring I of cover in the top surface clamp screw outside in the through-hole of the cylinder end bottom of top surface clamp plate, II one end lateral wall faces of founding seat are installed curb plate I, and locate to install side benchmark I in the middle of I surface of curb plate, auxiliary stay I and auxiliary stay II are installed respectively to the lateral wall top and the bottom of curb plate I, install curb plate II on the other end face of founding seat II, side benchmark II and side benchmark III are installed respectively to the top and the bottom of curb plate II tops, install the side benchmark on the II faces of side plate.
And planes, which are opposite to the side surface reference I, the side surface reference II and the side surface reference III, of the floating pressure plate are side surface reference points.
The second auxiliary support comprises a U-shaped base and a vertical plate, the U-shaped base is fixedly installed on the base through bolts, the vertical plate is fixedly installed on the side wall of the base through bolts, an auxiliary support III and an auxiliary support IV are installed at the top of the U-shaped base respectively, and an auxiliary support V and an auxiliary support VI which correspond to the auxiliary support III and the auxiliary support IV are installed at the top of the vertical plate respectively.
A method for clamping a part by adopting a large-scale thin-wall hollow blade-type casting part accurate clamping and positioning fixture for milling comprises the following steps:
step 1, placing a part blade profile on a positioning fixture; then adjusting the position of the blade profile of the part to enable the blade profile to be attached to six datum points formed by a side datum I, a side datum II, a side datum III, a side datum and two bottom datums, and ensuring no gap;
step 2, installing the adjustable support into the hollow blade profile of the part, adjusting the installation position of the adjustable support, then adjusting a tensioning screw by using a hexagonal wrench, adjusting the extension length of the sliding support end of the adjustable support, and propping the inner wall surfaces at two sides of the blade profile of the part by a fixed end profiling support surface and a sliding end profiling support surface of the adjustable support so as to make the external support point and the pressing point of the part collinear along the direction of the adjustable support and ensure that the part has no obvious deformation;
step 3, adjusting an auxiliary support II and an auxiliary support I to enable the auxiliary support I and the auxiliary support II to be just tightly attached to the blade profile, screwing a lateral compression screw to enable a floating pressure plate to move axially to compress the side face of the blade profile, and ensuring that six reference points of a positioning clamp keep contact with parts without gaps in the compression process;
step 4, screwing the top surface compression screw to enable the top surface pressure plate to compress the upper part of the leaf profile of the part, and ensuring that six datum points of the positioning fixture are kept in contact with the part without clearance in the compression process;
step 5, adjusting auxiliary supports III on the rest parts to be matched with the auxiliary support V, the auxiliary support IV to be matched with the auxiliary support VI and the bottom auxiliary support to tightly press the part, and controlling by using a dial indicator in the pressing process to ensure that the part is not obviously deformed in the clamping process;
step 6, measuring the part state by a typical coordinate point tabulating method, analyzing data, and establishing a coordinate system according to the data to perform milling operation after the data is confirmed to be free of problems;
and 7, milling the blade-shaped end face, the side wall profile and the island inner shape of the part after the coordinate system is determined.
The adjustable support comprises a long connecting rod, a positioning ball I and a positioning ball II are respectively installed at two ends of the long connecting rod, the positioning ball I is hinged to one end of a position adjusting screw rod I, the positioning ball II is hinged to one end of a position adjusting screw rod II, the other end of the position adjusting screw rod I is hinged to the side wall face of the fixed support end of the spiral support device, and the other end of the position adjusting screw rod II is connected with the other side wall face of the fixed support end of the spiral support device into a whole in a brazing mode.
The spiral supporting device comprises a fixed supporting end, the end face of one end of the fixed supporting end is a fixed end profiling supporting face, the other end of the fixed supporting end is provided with a groove, a sliding supporting end is installed in the groove, the end face of the sliding supporting end is a sliding end profiling supporting face, a wedge-shaped sliding block is installed in the sliding supporting end in a sliding mode, a spring II is installed between the sliding supporting end and the wedge-shaped sliding block, the wedge-shaped sliding block is connected with a driving device in threaded connection with the fixed supporting end, and in the working state, the wedge-shaped sliding block of the driving device is rotated to move inwards along the groove of the sliding supporting end to push the sliding end profiling supporting face to move outwards; under the non-working state, the reverse rotation driving device drives the wedge-shaped sliding block to move outwards along the groove of the sliding support end, and simultaneously drives the sliding support end to retract into the groove under the action of the elastic force of the spring.
The beneficial technical effects of the invention are as follows:
the positioning tool has the advantages of simple structure, convenience in operation, accuracy in positioning, reduction in vibration, obvious effect of controlling deformation and the like. The precise clamping, positioning and milling device can be widely applied to the precise clamping, positioning and milling process of hollow, thin-wall and special-shaped structure blade condition type parts in multiple fields such as aero-engines and gas turbines. The part clamping and positioning precision can be effectively improved, the part deformation is reduced, and the product percent of pass and the production efficiency are improved.
At present, the machining method is successfully applied to the milling process of thin-wall hollow blade-type cast parts in a certain large turbofan engine project of our company, the part deformation in the compressing process is greatly reduced, and the part positioning precision in the mirror machining process is ensured. After the processing method is popularized by a company, the cost of part quality loss, working hours and the like of the company can be saved by about 60 ten thousand yuan.
Drawings
FIG. 1 is a schematic diagram showing a relative position relationship of a large thin-wall hollow blade-type casting part after the part is accurately clamped and positioned by a positioning clamp;
FIG. 2 is a schematic diagram of a precise clamping and positioning fixture for large thin-wall hollow blade-type casting parts;
FIG. 3 is a sectional view of the precise clamping and positioning fixture for large thin-wall hollow blade-type cast parts according to the present invention;
FIG. 4 is a working schematic diagram of a floating pressing plate of the precise clamping and positioning fixture for large thin-wall hollow blade-type cast parts;
FIG. 5 is a schematic view of the adjustable support mounting position of the present invention;
FIG. 6 is a schematic view of the position of the adjustable support of the present invention in the cross-section of the cavity of the part;
FIG. 7 is a schematic view of an adjustable support according to the present invention;
FIG. 8 is a schematic view of the internal structure of the spiral supporting device of the adjustable support of the present invention;
FIG. 9 is a schematic diagram of a part structure of the invention for selecting a typical dimension check coordinate position on a blade profile;
1-base, 2-bottom datum, 3-bottom auxiliary support, 4-vertical base I, 5-chute, 6-long slide block, 7-connecting rod, 8-floating pressure plate, 9-lateral compression screw, 10-top plate, 11-back plate, 12-vertical base II, 13-top pressure plate, 14-spring I, 15-auxiliary support I, 16-auxiliary support II, 17-lateral base II, 18-lateral base III, 19-lateral base I, 20-lateral base, 21-U-shaped base, 22-vertical plate, 23-auxiliary support III, 24-auxiliary support IV, 25-auxiliary support V, 26-auxiliary support VI, 27-long connecting rod, 28-positioning ball I, 29-positioning ball II, 30-position adjusting screw I, 31-position adjusting screw II, 32-fixed support end, 33-fixed end profiling support surface, 34-sliding support end, 35-wedge-shaped slide block, 36-spring, 37-top surface compression screw, 38-adjustable support, 39-adjustable sliding support end, and 40-profiling support surface.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 2 to 4, the accurate clamping and positioning fixture for the large thin-wall hollow blade-shaped cast part comprises a base 1 for supporting an upper structure, wherein a floating pressure plate assembly, a first auxiliary supporting assembly, a second auxiliary supporting assembly, a bottom datum 2 and a bottom auxiliary supporting assembly 3 are respectively installed on the base 1 through bolts, the floating pressure plate assembly and the first auxiliary supporting assembly are located at one end of the upper surface of the base 1, the floating pressure plate assembly and the first auxiliary supporting assembly are just opposite to each other, the bottom datum and the bottom auxiliary supporting assembly 3 are installed on the base 1 between the floating pressure plate assembly and the first auxiliary supporting assembly, and the second auxiliary supporting assembly which is just opposite to the bottom datum 2 is installed at the other end of the upper surface of the base 1.
The floating pressing plate assembly comprises a vertical seat I4, the bottom end of the vertical seat I4 is fixedly installed on the base 1 through bolts, a sliding groove 5 is formed in the top of the vertical seat I4, a long sliding block 6 is installed in the sliding groove 5, the front end of the long sliding block 6 is connected with a connecting rod 7, floating pressing plates 8 are installed at the two ends of the connecting rod 7 respectively, the floating pressing plates 8 can rotate freely on the connecting rod 7, the floating pressing plates 8 are installed on the connecting rod 7 through nuts, the rear end of the long sliding block 6 is rotatably connected with the end portion of a screw of a lateral pressing screw 9, a top plate 10 and a rear plate 11 are installed on the top of the vertical seat I4 and the rear side wall respectively to seal the sliding groove 5, the rear plate 11 is connected with the lateral pressing screw 9 through threads, the lateral pressing screw 9 is rotated to push the long sliding block 6 to slide in the sliding groove 5, and then the floating pressing plates 8 are pushed to compress the blade profiles.
The front end of the long sliding block 6 is processed with a U-shaped seat, through holes are formed in two support arms of the U-shaped seat, the middle of the connecting rod 7 is provided with a through hole corresponding to the through hole of the U-shaped seat, the connecting rod 7 is located in the U-shaped seat, the connecting rod 7 is fixed on the U-shaped seat through a bolt passing through the through hole of the U-shaped seat and the through hole of the connecting rod 7 and then screwed with a nut at the end of the bolt, and the rear end of the long sliding block 6 is provided with a through hole matched with a ball at the front end of the lateral compression screw 9, so that the ball of the lateral compression screw 9 can rotate in the through hole.
The two bottom benchmarks 2 are arranged face to face, the cross section of each bottom benchmark 2 is L-shaped, the horizontal portions of the bottom benchmarks 2 are fixedly mounted on the base 1 through bolts, and the tops of the vertical portions of the bottom benchmarks 2 are machined into arc surfaces to form positioning benchmarks.
The bottom auxiliary support 3 is a support screw, a screw rod part of the bottom auxiliary support is screwed on the base 1, and a screw cap part forms an auxiliary support.
The first auxiliary support comprises a vertical seat II 12, the bottom end of the vertical seat II 12 is fixedly installed on the base 1 through a bolt, a counter bore is formed in the top of the vertical seat II 12, a small hole of the counter bore is processed into a threaded hole, the cylindrical end of the top surface pressing plate 13 is installed in a large hole of the counter bore, a top surface pressing screw 37 penetrates through a through hole in the cylindrical end of the top surface pressing plate 13 and is in threaded connection with the small hole of the counter bore, a spring I14 sleeved on the outer side of the top surface pressing screw 37 is installed in the through hole in the bottom of the cylindrical end of the top surface pressing plate 13, and vertical pre-tightening can be applied to parts by screwing the top surface pressing screw 37, through loosening top surface housing screw 37 top surface clamp plate 13 and rise under spring I14's elastic force effect and play the part of dismantling of being convenient for, top surface clamp plate 13's front end lower surface department installs the nylon pad, stand II 12 one end lateral wall face in the seat and install curb plate I, and locate to install side benchmark I19 in the middle of I surface in the curb plate, auxiliary stay I15 and auxiliary stay II 16 are installed respectively to the lateral wall top and the bottom of curb plate I, install curb plate II on the other end lateral wall face of standing II 12 in the seat, side benchmark II 17 and side benchmark III 18 are installed respectively to the top and the bottom of curb plate II, install side benchmark 20 on II 12 lateral wall faces in II tops in the curb plate.
And the planes of the side datum I19, the side datum II 17 and the side datum III 18 opposite to the floating pressure plate 8 are side datum points.
The second auxiliary support comprises a U-shaped base 21 and a vertical plate 22, the U-shaped base 21 is fixedly mounted on the base 1 through bolts, the vertical plate 22 is fixedly mounted on the side wall of the base 1 through bolts, an auxiliary support III 23 and an auxiliary support IV 24 are mounted at the top of the U-shaped base 21 respectively, and an auxiliary support V25 and an auxiliary support VI 26 which correspond to the auxiliary support III 23 and the auxiliary support IV 24 are mounted at the top of the vertical plate 22 respectively.
A method for clamping a part by adopting a large-scale thin-wall hollow blade-type casting part accurate clamping and positioning fixture for milling comprises the following steps:
step 1, placing a part blade profile on a positioning fixture according to the position and the direction of the attached drawing 1; then adjusting the position of the blade profile of the part to ensure that the blade profile is attached to six datum points formed by a side datum I19, a side datum II 17, a side datum III 18, a side datum 20 and two bottom datums 2 in the attached drawing 2, so as to ensure no gap;
step 2, installing an adjustable support 38 into the hollow blade profile of the part according to the illustration in fig. 5 and fig. 6, wherein the structural schematic diagram of the adjustable support 38 is shown in fig. 7 and fig. 8; adjusting the installation position of the adjustable support 38, then adjusting a tensioning screw by using a hexagonal wrench, adjusting the extension length of the sliding support end 34 of the adjustable support 38, and propping the inner wall surfaces of two sides of the leaf profile of the part by the fixed end profiling support surface 33 and the sliding end profiling support surface 39 of the adjustable support, so that the external support point and the compression point of the part are collinear along the direction of the adjustable support 38 and the part is ensured not to have obvious deformation;
the specific structure of the adjustable support 38 is: the adjustable support 38 comprises a long connecting rod 27, two ends of the long connecting rod 27 are respectively provided with a positioning ball I28 and a positioning ball II 29, the positioning ball I28 is hinged with one end of a position adjusting screw I30, the positioning ball II 29 is hinged with one end of a position adjusting screw II 31, the other end of the position adjusting screw I30 is hinged on the side wall surface of a fixed support end 32 of the spiral support device, the other end of the position adjusting screw II 31 is connected with the other side wall surface of the fixed support end 32 of the spiral support device into a whole in a brazing mode, and the side wall surface of the fixed support end 32 hinged with the position adjusting screw I30 is vertical to the side wall surface of the fixed support end brazed with the position adjusting screw II 31; in the embodiment, the adjusting screw I30 and the adjusting screw II 31 have the same structure and are composed of two screws and a threaded sleeve, the two screws are connected together in a threaded manner through the threaded sleeve, the thread directions of two ends of the threaded sleeve are opposite, and the two screws are close to or separated from each other by rotating the threaded sleeve, so that the lengths of the adjusting screw I30 and the adjusting screw II 31 are adjusted;
the spiral supporting device comprises a fixed supporting end 32, the end face of one end of the fixed supporting end 32 is a fixed end profiling supporting surface 33, the other end of the fixed supporting end is provided with a groove, a sliding supporting end 34 is installed in the groove, the end face of the sliding supporting end 34 is a sliding end profiling supporting surface 39, a wedge-shaped sliding block 35 is installed in the sliding supporting end 34 in a sliding mode, a spring II 36 is installed between the sliding supporting end 34 and the wedge-shaped sliding block 35, the wedge-shaped sliding block 35 is connected with a driving device in threaded connection with the fixed supporting end 32, the driving device is a tensioning screw 40 in the embodiment, and in the working state, the wedge-shaped sliding block 35 of the driving device is rotated to move inwards along the groove of the sliding supporting end 34 to push the sliding end profiling supporting surface to move outwards; under the non-working state, the reverse rotation driving device drives the wedge-shaped slide block 35 to move outwards along the groove of the sliding support end 34, and simultaneously drives the sliding support end 34 to retract into the groove under the action of the elastic force of the spring II 36;
step 3, adjusting the auxiliary support II 16 and the auxiliary support I15 to enable the auxiliary support I15 and the auxiliary support II 16 to be just tightly attached to the blade profile, screwing the lateral compression screw 9 to enable the floating pressure plate 8 to move axially to compress the side face of the blade profile, and ensuring that six reference points of the positioning fixture keep contact with parts without gaps in the compression process;
step 4, screwing the top surface compression screw 37 to enable the top surface pressure plate 13 to compress the upper part of the leaf profile of the part, and ensuring that six reference points of the positioning clamp keep contact with the part without clearance in the compression process;
step 5, adjusting auxiliary supports III 23 on the rest parts to match with an auxiliary support V25, an auxiliary support IV 24 to match with an auxiliary support VI 26 and a bottom auxiliary support 3 to tightly support the part, and controlling by using a dial indicator in the pressing process to ensure that the part is not obviously deformed in the clamping process;
step 6, as shown in a simplified diagram of the part structure of the attached drawing 9, firstly, selecting a theoretical straight line on the upper part of the blade profile to preliminarily determine an angular zero point, and then respectively selecting typical dimension checking coordinate positions on the part along the X-axis direction, the Y-axis direction and the Z-axis direction:
step 6.1, checking the thickness dimension T0 by using a dial indicator in the X-axis direction, and if the actually measured dimension T1 is different from the theoretical value T0, adjusting a processing coordinate system in the X direction to ensure that the allowance distribution is relatively uniform in the X + and X-coordinate directions;
6.2, checking the thickness dimension S0 by using a dial indicator in the Y-axis direction, and if the actually measured dimension Sl is different from the theoretical value S0, adjusting a processing coordinate system in the Y direction to ensure that the margin distribution is relatively uniform in the Y + and Y-coordinate directions;
step 6.3, checking the thickness dimension H0 by using a dial indicator in the Z-axis direction, if the actually measured dimension H1 is different from the theoretical value H0, adjusting a Z-direction processing coordinate system, wherein the offset of the original Z-axis coordinate origin Z0 in the Z + direction is as follows: Δ Z = (H1-H0)/2, and the allowance distribution of the machining coordinate system along the Z circumferential direction can be relatively uniform after coordinate deviation;
and 7, after the coordinate system is determined, milling a part, wherein the part has three types of processing parts, and the milling strategies of the three parts are as follows:
step 7.1: processing the blade profile end face: use of
Figure BDA0003906355640000061
The milling cutter is used for processing the blade-shaped end face, the cutting thickness of each layer is not more than 1mm, and the cutting force and vibration can be effectively reduced;
and 7.2: processing the profile of the side wall: use of
Figure BDA0003906355640000062
The milling cutter processes the side wall profile, the cutting thickness of each layer is not more than 0.5mm, and the cutting force and vibration can be effectively reduced;
step 7.3: inner shape of processing island
Step 7.3.1: drilling by a drill bit, feeding the drill bit for less than 100mm/min, and controlling the cutting force in the Y-axis direction;
step 7.3.2: spirally reaming by using a milling cutter, feeding the hole to be less than 200mm/min, and controlling the cutting force in the Y-axis direction;
and 7.3.3, the milling cutter mills the inner contour, the overhanging length of the cutter is reduced, the cutter back-off amount is controlled, and the finish machining size of the part is ensured.
Through the operation, the cast large-scale thin-wall hollow blade-shaped part can be accurately clamped, aligned and positioned, and the milling of the part is finished at high quality.

Claims (10)

1. The utility model provides a hollow profile casting part of large-scale thin wall accurate clamping positioning fixture, its characterized in that, is including the base that is used for supporting superstructure, install unsteady clamp plate subassembly, first auxiliary stay subassembly, second auxiliary stay subassembly, bottom benchmark and bottom auxiliary stay respectively through the bolt on the base, unsteady clamp plate subassembly and first auxiliary stay subassembly are located base upper surface one end and both just to setting up, install bottom benchmark and bottom auxiliary stay on the base between the two, install the second auxiliary stay subassembly just to setting up with the bottom benchmark at the base upper surface other end.
2. The accurate clamping positioning fixture of large-scale thin-wall hollow blade type casting part of claim 1, characterized in that: the floating pressing plate assembly comprises an upright seat I, the bottom end of the upright seat I is fixedly installed on the base through bolts, a sliding groove is formed in the top of the upright seat I, a long sliding block is installed in the sliding groove, the front end of the long sliding block is connected with a connecting rod, floating pressing plates are installed at the two ends of the connecting rod respectively, the floating pressing plates are fixed on the connecting rod through nuts, the rear end of the long sliding block is connected with the end part of a screw of a lateral pressing screw in a rotating mode, a top plate and a rear plate sealing sliding groove are installed on the top of the upright seat I and the rear side wall respectively, the rear plate is connected with the lateral pressing screw in a threaded mode, the lateral pressing screw is pushed to slide in the sliding groove through rotation, and then the floating pressing plates are pushed to compress blade profiles.
3. The accurate clamping and positioning fixture for large-scale thin-wall hollow blade-type casting parts according to claim 1 is characterized in that: the connecting rod is located in the U-shaped seat, and the connecting rod is fixed on the U-shaped seat through a bolt in a threaded nut at the end of the bolt after the bolt penetrates through the through hole of the U-shaped seat and the through hole of the connecting rod.
4. The accurate clamping and positioning fixture for large-scale thin-wall hollow blade-type casting parts according to claim 1 is characterized in that: the bottom benchmarks are arranged face to face, the cross section of each bottom benchmark is L-shaped, the bottom benchmarks are fixedly installed on the base through horizontal portions and bolts, and the tops of vertical portions of the bottom benchmarks are machined to be arc surfaces to form positioning benchmarks.
5. The accurate clamping and positioning fixture for large-scale thin-wall hollow blade-type casting parts according to claim 1 is characterized in that: first auxiliary stay is including founding seat II, it passes through bolt fixed mounting on the base to found II bottoms of seat, the counter sink has been seted up at II tops of founding seat, the aperture of counter sink is processed into the screw hole, the cylinder end of top surface clamp plate is installed in the macropore of counter sink, top surface clamp screw passes the through-hole of top surface clamp plate cylinder end and the aperture threaded connection of counter sink, and install the spring I of cover in the top surface clamp screw outside in the through-hole of the cylinder end bottom of top surface clamp plate, it installs curb plate I and curb plate II to found II one end lateral wall faces of seat, and install side benchmark I between curb plate I and curb plate II, auxiliary stay I and auxiliary stay II are installed respectively to the lateral wall top of curb plate I and the lateral wall bottom of curb plate II, install curb plate III on the other end face of founding seat II, side benchmark II and side benchmark are installed respectively to the top and the bottom of curb plate III, install the side benchmark on the II faces of the seat in the side plate III top.
6. The accurate clamping positioning fixture of large-scale thin-wall hollow blade type casting part of claim 5, characterized in that: and the plane where the side surface datum I, the side surface datum II and the side surface datum III are opposite to the floating pressing plate is a side surface datum point.
7. The accurate clamping and positioning fixture for large-scale thin-wall hollow blade-type casting parts according to claim 1 is characterized in that: the second auxiliary support comprises a U-shaped base and a vertical plate, the U-shaped base is fixedly installed on the base through bolts, the vertical plate is fixedly installed on the side wall of the base through bolts, an auxiliary support III and an auxiliary support IV are installed at the top of the U-shaped base respectively, and an auxiliary support V and an auxiliary support VI which correspond to the auxiliary support III and the auxiliary support IV are installed at the top of the vertical plate respectively.
8. The method for milling the part by clamping the part through the accurate clamping and positioning clamp for the large thin-wall hollow blade-type cast part according to claim 1 is characterized by comprising the following steps of:
step 1, placing a part blade profile on a positioning fixture; then adjusting the blade profile position of the part to ensure that the blade profile is attached to six datum points formed by a side datum I, a side datum II, a side datum III, a side datum and two bottom datums, so as to ensure no gap;
step 2, installing the adjustable support into the hollow blade profile of the part, adjusting the installation position of the adjustable support, then adjusting a tensioning screw by using a hexagonal wrench, adjusting the extension length of a sliding support end of the adjustable support, and propping the inner wall surfaces at two sides of the blade profile of the part by a fixed end profiling support surface and a sliding end profiling support surface of the adjustable support so that the external support point and the pressing point of the part are collinear along the direction of the adjustable support and the part is ensured not to be deformed obviously;
step 3, adjusting the auxiliary support II and the auxiliary support I to enable the auxiliary support I and the auxiliary support II to be just tightly attached to the blade profile, screwing a lateral compression screw to enable the floating pressure plate to move axially to compress the side face of the blade profile, and ensuring that six reference points of the positioning clamp are kept in contact with parts without gaps in the compression process;
step 4, screwing the top surface compression screw to enable the top surface pressure plate to compress the upper part of the leaf profile of the part, and ensuring that six datum points of the positioning fixture are kept in contact with the part without clearance in the compression process;
step 5, adjusting auxiliary supports III on the other parts to be matched with an auxiliary support V, an auxiliary support IV to be matched with an auxiliary support VI and a bottom auxiliary support to tightly support the part, and controlling the part by using a dial indicator in the pressing process to ensure that the part is not obviously deformed in the clamping process;
step 6, measuring the part state by a typical coordinate point tabulating method, analyzing data, and establishing a coordinate system according to the data to perform milling operation after the data is confirmed to be free of problems;
and 7, milling the blade-shaped end face, the side wall profile and the island inner shape of the part after the coordinate system is determined.
9. The method for milling the part by accurately clamping and positioning the part by the clamp according to claim 8, which is characterized in that: the adjustable supporting device comprises a long connecting rod, a positioning ball I and a positioning ball II are respectively installed at two ends of the long connecting rod, the positioning ball I is hinged to one end of a position adjusting screw rod I, the positioning ball II is hinged to one end of a position adjusting screw rod II, the other end of the position adjusting screw rod I is hinged to the side wall face of the fixed supporting end of the spiral supporting device, and the other end of the position adjusting screw rod II is connected with the other side wall face of the fixed supporting end of the spiral supporting device into a whole in a brazing mode.
10. The method for milling the part by accurately clamping and positioning the part by the clamp according to claim 9, which is characterized in that: the spiral supporting device comprises a fixed supporting end, the end face of one end of the fixed supporting end is a fixed end profiling supporting face, the other end of the fixed supporting end is provided with a groove, a sliding supporting end is installed in the groove, the end face of the sliding supporting end is a sliding end profiling supporting face, a wedge-shaped sliding block is installed in the sliding supporting end in a sliding mode, a spring II is installed between the sliding supporting end and the wedge-shaped sliding block, the wedge-shaped sliding block is connected with a driving device in threaded connection with the fixed supporting end, and in the working state, the wedge-shaped sliding block of the driving device is rotated to move inwards along the groove of the sliding supporting end to push the sliding end profiling supporting face to move outwards; under the non-working state, the reverse rotation driving device drives the wedge-shaped sliding block to move outwards along the groove of the sliding support end, and simultaneously drives the sliding support end to retract into the groove under the action of the elastic force of the spring.
CN202211306763.XA 2022-10-25 2022-10-25 Accurate clamping and positioning fixture for large thin-wall hollow blade-type cast part and milling method Pending CN115488660A (en)

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CN202211306763.XA CN115488660A (en) 2022-10-25 2022-10-25 Accurate clamping and positioning fixture for large thin-wall hollow blade-type cast part and milling method

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CN202211306763.XA CN115488660A (en) 2022-10-25 2022-10-25 Accurate clamping and positioning fixture for large thin-wall hollow blade-type cast part and milling method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116604374A (en) * 2023-07-20 2023-08-18 沈阳强航时代精密科技有限公司 Clamp for positioning and compacting turbine guide blade of aero-engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116604374A (en) * 2023-07-20 2023-08-18 沈阳强航时代精密科技有限公司 Clamp for positioning and compacting turbine guide blade of aero-engine
CN116604374B (en) * 2023-07-20 2023-09-15 沈阳强航时代精密科技有限公司 Clamp for positioning and compacting turbine guide blade of aero-engine

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