CN114346593B - Machining and manufacturing method of special-shaped part - Google Patents
Machining and manufacturing method of special-shaped part Download PDFInfo
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- CN114346593B CN114346593B CN202111423864.0A CN202111423864A CN114346593B CN 114346593 B CN114346593 B CN 114346593B CN 202111423864 A CN202111423864 A CN 202111423864A CN 114346593 B CN114346593 B CN 114346593B
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Abstract
The disclosure provides a processing and manufacturing method of special-shaped parts, and belongs to the field of machine manufacturing. The processing and manufacturing method comprises the following steps: providing a blank, wherein the blank is of an aluminum alloy structure; rough machining is carried out on the blank to obtain a first machined part, the first machined part comprises a body and a plurality of first auxiliary positioning structures, the body is provided with a first cambered surface, a second cambered surface and a plurality of supporting feet, and the first machined part is fixed on a working platform through the first auxiliary positioning structures; and carrying out finish machining on the first machined part to obtain the special-shaped part. According to the machining and manufacturing method, the first machined parts are fixed on the working platform through the plurality of first auxiliary positioning structures, machining deformation of special-shaped parts can be reduced, and machining accuracy is improved.
Description
Technical Field
The disclosure belongs to the field of machine manufacturing, and particularly relates to a processing and manufacturing method of special-shaped parts.
Background
With the continuous development of modern aerospace technology, the requirements of the manufacturing technology level of parts are higher and higher. For some special-shaped thin-wall parts, particularly for the contact part of the part with other parts during use, the manufacturing precision requirement is higher and higher.
In the related art, the processing and manufacturing method of the special-shaped part generally adopts a block-shaped blank, the block-shaped blank is clamped at first, then two opposite side surfaces of the block-shaped blank are processed into arc surfaces, and the other two sides of the block-shaped blank are processed to obtain supporting feet, so that the special-shaped part is finally obtained.
However, because the special-shaped part is an aluminum alloy structural part, the special-shaped part is easy to deform when the block-shaped blank is clamped and positioned, and the precision of the machined special-shaped part cannot meet the requirement.
Disclosure of Invention
The embodiment of the disclosure provides a processing and manufacturing method of a special-shaped part, which can reduce deformation of the special-shaped part and improve processing precision. The technical scheme is as follows:
the embodiment of the disclosure provides a processing and manufacturing method of a special-shaped part, which comprises the following steps:
providing a blank, wherein the blank is of an aluminum alloy structure; rough machining is carried out on the blank to obtain a first machined part, the first machined part comprises a body and a plurality of first auxiliary positioning structures, the body is provided with a first cambered surface, a second cambered surface and a plurality of supporting legs, the first cambered surface and the second cambered surface are positioned on two opposite sides of the body, the plurality of supporting legs are positioned on two sides of the body in a pairwise symmetrical mode by taking the axis of the first cambered surface, the plurality of first auxiliary positioning structures are connected with the body, and the plurality of supporting legs are positioned on the outer edges of the second cambered surface in a pairwise symmetrical mode by taking the axis of the second cambered surface as the axis; fixing the first machined part on a working platform through the first auxiliary positioning structure; and carrying out finish machining on the first machined part to obtain the special-shaped part.
In yet another implementation manner of the present disclosure, the first auxiliary positioning structure is a positioning block, the positioning block has a first connection hole, the first connection hole is located on a surface of the positioning block away from the second cambered surface, and an axis of the first connection hole is perpendicular to an axial direction of the second cambered surface;
the fixing of the first workpiece on the working platform by the first auxiliary positioning structure comprises: and connecting the first connecting hole with the working platform through a fastener so as to fix the first workpiece on the working platform.
In yet another implementation of the present disclosure, the finishing the first workpiece to obtain the special-shaped part includes:
finish machining is carried out on the first cambered surface;
turning over the first workpiece and pressing the supporting legs so as to fix the first workpiece on the working platform and enable the second cambered surface to face the working platform;
and carrying out finish machining on the second cambered surface to obtain the special-shaped part.
In yet another implementation of the present disclosure, the finishing the first cambered surface includes:
carrying out partition processing on the first cambered surface, wherein the first cambered surface is divided into a first feeding area and two second feeding areas, the first feeding area is positioned between the two second feeding areas, and the first feeding area is positioned at the bottom of the first cambered surface; the feed parameter of the first feed zone is 2-4 times the feed parameter of the second feed zone.
In yet another implementation of the present disclosure, the pressing the supporting leg to fix the first workpiece on the work platform with the second arc surface facing the work platform includes:
and compressing the supporting leg by adopting a target compressing force, wherein the target compressing force is larger than the minimum compressing force, and when compressing the supporting leg, the deformation in the simulation deformation stress analysis of the first workpiece is smaller than the set deformation.
In yet another implementation of the present disclosure, the minimum compaction force is calculated in the following manner:
wherein F is the minimum pressing force of the supporting leg; f (F) C Milling force for the tool; n is the number of the supporting feet; μ is a static friction coefficient between the supporting leg and the working platform;
the milling force of the tool is calculated according to the following formula:
F C ＝C f *k f *a p 0.95 *a f 0.80 *d 0 -1.10 *z*a e 1.1 ；
wherein F is C Milling force for the tool; c (C) f Is a material correction value; k (k) f Is a correction coefficient; a, a p Is axial cutting depth; a, a f Feed amount for each revolution; d, d 0 Is the diameter of the cutter; z is the number of teeth of the cutter; a, a e Is radial cut.
In yet another implementation manner of the present disclosure, the finishing the second cambered surface to obtain the special-shaped part includes:
cutting off the first auxiliary positioning structure; carrying out partition processing on the second cambered surface, wherein the second cambered surface is divided into a third feeding area and two fourth feeding areas, the third feeding area is positioned between the two fourth feeding areas, and the third feeding area is positioned at the bottom of the second cambered surface; the feeding parameter of the third feeding zone is 2-4 times of the feeding parameter of the fourth feeding zone.
In yet another implementation of the present disclosure, the roughing the blank to obtain a first workpiece includes:
roughing a first side of the blank to form the first cambered surface; processing the plurality of supporting legs and a plurality of second auxiliary positioning structures on two sides of the blank, wherein the plurality of second auxiliary positioning structures are symmetrically positioned on two sides of the first cambered surface in pairs by taking the central axis of the first cambered surface as an axis, and each second auxiliary positioning structure is positioned between two adjacent supporting legs; fixing the blank on the working platform through the second auxiliary positioning structure; rough machining is carried out on the second side face of the blank to form the second cambered surface and a plurality of first auxiliary positioning structures, and the first machined piece is obtained;
the finish machining is performed on the first machined part to obtain the special-shaped part, and the method further comprises the following steps:
and cutting off the second auxiliary positioning structure before finishing the first cambered surface.
In yet another implementation manner of the present disclosure, the second auxiliary positioning structure is a positioning column, the positioning column has a second connection hole, the second connection hole is located on an end surface of the positioning column away from the second cambered surface, and an axis of the second connection hole is perpendicular to an axial direction of the second cambered surface;
fixing the blank on the working platform through the second auxiliary positioning structure comprises the following steps:
and connecting the second connecting hole and the working platform through a fastener so as to fix the blank on the working platform.
In yet another implementation manner of the present disclosure, before the fixing the first workpiece on the working platform by the first auxiliary positioning structure, the manufacturing method further includes:
the first workpiece is left to stand for a predetermined period of time to relieve the processing stress.
The technical scheme provided by the embodiment of the disclosure has the beneficial effects that:
according to the machining and manufacturing method for the special-shaped part, when the special-shaped part is machined and manufactured, the blank is machined, the first machined part is roughly milled, then the first machined part is fixed on the working platform through the first auxiliary positioning structure, so that the first machined part is prevented from being fixed only by means of clamping and the like, clamping deformation of the first machined part in the subsequent machining process is reduced, and finally the machining precision of the whole special-shaped part is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a front view of a profiled part provided by an embodiment of the present disclosure;
FIG. 2 is a schematic rear view of a profiled part provided by an embodiment of the present disclosure;
FIG. 3 is a flow chart of a method of manufacturing a profiled part provided in an embodiment of the disclosure;
FIG. 4 is a flow chart of another method of manufacturing a profiled part provided in an embodiment of the present disclosure;
FIG. 5 is a front view of a first work piece provided by an embodiment of the present disclosure;
FIG. 6 is a schematic rear view of a first work piece provided in an embodiment of the present disclosure;
fig. 7 is a schematic processing diagram of the first cambered surface provided in the present embodiment.
The symbols in the drawings are as follows:
100. a first cambered surface; 101. a first feed zone; 102. a second feed zone; 200. a second cambered surface; 300. supporting feet; 301. a support surface; 302. a compression surface; 400. a second auxiliary positioning structure; 500. a first auxiliary positioning structure; 600. a cutter.
Detailed Description
For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.
In this embodiment, in order to clearly explain the processing and manufacturing method provided by the embodiment of the present disclosure, first, a basic structure of a special-shaped part will be briefly described with reference to fig. 1.
Fig. 1 is a front view of a profiled part provided in an embodiment of the disclosure, as shown in fig. 1, a profiled part semi-cylindrical aluminum alloy structural member. The profiled part comprises a first cambered surface 100, a second cambered surface 200 and a plurality of supporting feet 300. The first cambered surface 100 and the second cambered surface 200 are oppositely arranged, and the axis of the first cambered surface 100 and the axis of the second cambered surface 200 are coaxial. The supporting feet 300 are arranged on two opposite sides of the first cambered surface 100 in pairs by taking the axis of the first cambered surface 100 as the axis. One of the outer side walls of support foot 300 is a portion of first cambered surface 100.
Fig. 2 is a schematic back view of a special-shaped part provided in the embodiment of the disclosure, and referring to fig. 2, the supporting leg 300 is in a strip-shaped block structure, the supporting leg 300 faces one end surface of the first cambered surface 100 to form a supporting surface 301, and the supporting leg 300 faces one end surface of the second cambered surface 200 to form a pressed surface 302. Along the axis direction perpendicular to the second cambered surface 200, the pressure receiving surface 302 is lower than the outer edge of the second cambered surface 200, and a step is formed between the pressure receiving surface 302 and the outer edge of the second cambered surface 200.
In this embodiment, the profiled element may be a claw.
The embodiment of the disclosure provides a processing and manufacturing method of a special-shaped part, as shown in fig. 3, the processing and manufacturing method comprises the following steps:
s301: providing a blank, wherein the blank is of an aluminum alloy structure.
In this embodiment, the blank member is a rectangular parallelepiped block-shaped aluminum alloy structural member. The blank may envelop the entire profiled part.
S302: rough machining is carried out on the blank to obtain a first machined part, the first machined part comprises a body and a plurality of first auxiliary positioning structures, the body is provided with a first cambered surface, a second cambered surface and a plurality of supporting legs, the first cambered surface and the second cambered surface are positioned on two opposite sides of the body, the plurality of supporting legs are positioned on two sides of the body in a symmetrical mode by the axis of the first cambered surface, the plurality of first auxiliary positioning structures are connected with the body, and the central axis of the second cambered surface is used as the outer edge of the second cambered surface in a symmetrical mode by the axis of the second cambered surface.
In this embodiment, the first workpiece is provided with the preliminary profile of the profiled part by roughing the blank. And the first cambered surface, the second cambered surface and the like leave a machining allowance of 0.8-1mm for subsequent continuous machining.
S303: the first workpiece is fixed on the working platform through the first auxiliary positioning structure.
In this embodiment, the first workpiece may be fixed on the working platform by the first auxiliary positioning structure, so as to avoid clamping or compacting in the conventional machining manner, so as to reduce deformation of the special-shaped part.
S304: and carrying out finish machining on the first machined part to obtain the special-shaped part.
According to the machining and manufacturing method for the special-shaped part, when the special-shaped part is machined and manufactured, the blank is machined, the first machined part is roughly milled, then the first machined part is fixed on the working platform through the first auxiliary positioning structure, so that the first machined part is prevented from being fixed only by means of clamping and the like, clamping deformation of the first machined part in the subsequent machining process is reduced, and finally the machining precision of the whole special-shaped part is improved.
Fig. 4 is a flowchart of another processing and manufacturing method of a special-shaped part according to an embodiment of the disclosure, and in combination with fig. 4, the processing and manufacturing method includes:
s401: a blank is provided.
The relevant contents of the blank member can be referred to S401, and a detailed description thereof is omitted herein.
S402: rough machining is carried out on the first side face of the blank to form a first cambered surface, a plurality of supporting legs and a plurality of second auxiliary positioning structures are machined on the two sides of the blank, the plurality of second auxiliary positioning structures are symmetrically located on the two sides of the first cambered surface by taking the central axis of the first cambered surface as an axis, and each second auxiliary positioning structure is located between two adjacent supporting legs.
In this embodiment, through carrying out the rough machining back to the first side of blank, can make the first side of first machined part have curved first cambered surface, supporting legs and second auxiliary positioning structure, alright fix a position the blank through second auxiliary positioning structure like this to this reduces the clamping deformation of first machined part in follow-up course of working.
Illustratively, step S402 is implemented by:
4021: and (3) carrying out rough milling on the first side surface of the blank, and roughly milling a first cambered surface.
During actual processing, firstly, the blank is placed on the vertical processing machine tool in a clamping or pressing plate mode, and the first side face of the blank faces to the main shaft of the machine tool, so that the first cambered surface can be conveniently and roughly milled, and the roughly milled first cambered surface faces to the main shaft of the vertical processing machine tool.
4022: and (3) carrying out rough milling on two sides of the blank, and rough milling a plurality of second auxiliary positioning structures and a plurality of supporting feet.
In this embodiment, when rough milling is performed on two sides of the first cambered surface, the second auxiliary positioning structure is rough milled between the two supporting legs while the supporting legs are rough milled.
The second auxiliary positioning structure is a positioning column, the positioning column is provided with a second connecting hole, the second connecting hole is positioned on the end face of the positioning column far away from the second cambered surface, and the axis of the second connecting hole is perpendicular to the axial direction of the second cambered surface.
Fig. 5 is a front view of a first workpiece provided in an embodiment of the disclosure, and in conjunction with fig. 5, the second auxiliary positioning structure 400 is a rectangular structural member, and a partial area of the first cambered surface is an outer surface of the second auxiliary positioning structure 400. The length direction of the second auxiliary positioning structure 400 is perpendicular to the axis of the first cambered surface 100.
In this embodiment, the number of the second auxiliary positioning structures 400 is four, and the four second auxiliary positioning structures 400 are symmetrically arranged on two sides of the axis of the first cambered surface 100 by taking the axis of the first cambered surface 100 as a shaft.
S403: the blank is fixed on the working platform through a second auxiliary positioning structure.
In this embodiment, after the second auxiliary positioning structures are rough milled, a second connection hole needs to be milled in each second auxiliary positioning structure. Therefore, the connecting pieces such as bolts and the like can be inserted into the second connecting holes and connected with the working platform, so that the first workpiece is fixed on the working platform by applying a tensile force to the first workpiece, and further clamping deformation of the first workpiece in the processing process is reduced.
Of course, when the second auxiliary positioning structure is used for processing the second connecting hole, the depth of the second connecting hole is ensured not to damage the first machined part.
That is, the above steps can process the second auxiliary positioning structure, so that the blank member can be tensioned by the second auxiliary positioning structure at the time of the subsequent processing, thereby fixing the blank member to the work platform to reduce the deformation.
S403 is performed by:
the second connecting hole is connected with the working platform through a fastener so as to fix the blank on the working platform.
In this embodiment, when the blank is fixed on the working platform by the screw, the screw is first assembled on the working platform by the screw thread, then the blank is connected with the screw by the screw thread, and then the gap between the supporting surface of the supporting leg and the working platform is controlled by controlling the rotation of the screw, so that the supporting leg can be fixed on the working platform.
When the second auxiliary positioning structure is tensioned by the screws, the gap between the second auxiliary positioning structure and the working platform is required to be smaller than 0.02mm, so that the inclination of the parts can be prevented.
S404: and rough machining a second cambered surface and a plurality of first auxiliary positioning structures on the second side surface of the blank to obtain a first machined part.
And (3) roughly milling a second cambered surface and a plurality of first auxiliary positioning structures on the second side surface along the length direction of the blank.
In this embodiment, the second cambered surface is coaxially arranged with the first cambered surface, and the arc length of the second cambered surface is smaller than that of the first cambered surface.
The first auxiliary positioning structure is a positioning block, the positioning block is provided with a first connecting hole, the first connecting hole is positioned on the surface of the positioning block, which is far away from the second cambered surface, and the axis of the first connecting hole is vertical to the axial direction of the second cambered surface.
Fig. 6 is a schematic back view of a first workpiece provided in an embodiment of the disclosure, and referring to fig. 6, the first workpiece includes four first auxiliary positioning structures 500, and the four first auxiliary positioning structures 500 are wedge-shaped block structures, and the first auxiliary positioning structures 500 are attached to two outer edges of the second arc surface 200.
S405: the first workpiece is left to stand for a predetermined period of time to relieve the processing stress.
In the natural environment, the first workpiece is placed for a predetermined period of time (which may be more than 24 hours), so that the first workpiece can automatically release the machining stress, and machining deformation caused by the existence of the machining stress in subsequent machining is avoided.
S406: milling the supporting surface of the supporting leg, wherein the supporting surface of the supporting leg is an end surface of the supporting leg facing the first cambered surface.
After releasing the stress, the first work piece is deformed to some extent. At this time, the support surface of the support leg is milled flat with a minimum machining amount. When milling the flat supporting legs, the second auxiliary supporting structure can be pressed by the pressing plate, so that the first workpiece is fixed on the workbench, and the deformation of the body of the part can be reduced.
S407: the first workpiece is fixed on the working platform through the first auxiliary positioning structure.
That is, after the first auxiliary positioning structures are processed, the first connecting holes are required to be milled on each first auxiliary positioning structure, so that the first auxiliary positioning structures can be subsequently connected with the working platform through the first connecting holes, the first workpiece is tensioned to fix the first workpiece on the working platform, and further, the clamping of the first workpiece in the processing process is reduced.
Of course, when the first auxiliary positioning structure is used for processing the first connecting hole, the depth of the first connecting hole is ensured not to hurt the part body, namely, the depth of the first connecting hole needs to be controlled.
S407 is realized by:
the first connecting hole is connected with the working platform through a fastener so as to fix the first machined part on the working platform.
The first machined part is fixed on the working platform through the first connecting hole.
In this embodiment, one end of the screw is connected in the first connecting hole, and the other end of the screw is connected to the working platform.
S408: and carrying out finish machining on the first machined part to obtain the special-shaped part.
Step S408 includes:
4081: the second auxiliary positioning structure is cut off.
4082: and carrying out finish machining on the first cambered surface.
Illustratively, 4082 includes:
(1) The first cambered surface is divided into a first feeding area and two second feeding areas, the first feeding area is positioned between the two second feeding areas, and the first feeding area is positioned at the bottom of the first cambered surface.
(2) The feed parameter of the first feed zone is 2-4 times the feed parameter of the second feed zone.
If the same processing parameters are adopted for processing the first cambered surface, the direction of the cutter walking is from the edge of one side of the first cambered surface to the bottom of the first cambered surface when the whole first cambered surface is processed, and then from the bottom of the first cambered surface to the edge of the other side of the first cambered surface, so that the cutter 600 has certain inertia, the bottom of the first cambered surface 100 is over-cut, and the profile tolerance is out of tolerance. Therefore, in order to improve the precision of the special-shaped part, when the first cambered surface is finish-milled, the first cambered surface is divided into a first feeding zone 101 and a second feeding zone 102, so that the feeding parameter f of the first feeding zone 101 is about 3 times that of the second feeding zone 102 (see fig. 5).
In this embodiment, the width of the first feed zone is 1-1.5 times the diameter of the knife 600.
4083: the first workpiece is turned over, and the supporting legs are pressed, so that the first workpiece is fixed on the working platform, and the second cambered surface faces the working platform.
And turning over the first machined part after finishing the finish machining of the first cambered surface. And then the supporting legs are pressed by the pressing plate, and the first machined part is fixed on the working platform.
In order to avoid a large deformation of the first workpiece after pressing, it is necessary to determine the pressing force of the individual support feet before pressing the support feet.
Illustratively, 4083 includes:
and the supporting leg is pressed by adopting a target pressing force, wherein the target pressing force is larger than the minimum pressing force, and the deformation in the simulation deformation stress analysis of the first workpiece is smaller than the set deformation when the supporting leg is pressed.
The minimum pressing force of each supporting leg is calculated in the following manner:
wherein F is the minimum pressing force of the supporting feet; f (F) C Milling force for the tool; n is the number of the supporting feet; μ is the static friction coefficient between the support leg and the working platform.
In this embodiment, the milling force of the tool is calculated according to the following formula:
F C ＝C f *k f *a p 0.95 *a f 0.80 *d 0 -1.10 *z*a e 1.1 ； (2)
wherein F is C For the milling force of the tool；C f Is a material correction value; k (k) f Is a correction coefficient; a, a p Is axial cutting depth; a, a f Feed amount for each revolution; d, d 0 Is the diameter of the cutter; z is the number of teeth of the cutter; a, a e Is radial cut.
That is, the pressing force of the support leg needs to be determined by the milling force of the tool, the friction force between the part and the machine tool, and the like. For example, using an end mill of diameter D20, at cutting parameter a p ＝0.6mm，a f In the case of=1 mm/r, the cutting force is 110N. The part is an aluminum part, the machine tool workbench is a steel part, and the pressing force of each position of the 6 supporting legs is at least 108N according to the friction coefficient between the aluminum part and the steel part.
According to the calculated minimum compression force, carrying out simulation deformation stress analysis on the first machined part, for example, applying different pressures (more than 108N) to a simulation model of the first machined part, and obtaining the compression force corresponding to the case that the internal and external profile deformation of the part is not more than 0.005mm at the moment, namely the target compression force.
According to the determined target pressing force, the pressing surfaces of the supporting feet are pressed by the pressing plate, so that the first workpiece is fixed on the working platform.
4084: the first auxiliary positioning structure is cut off.
The first auxiliary positioning structure needs to be cut before the second cambered surface is finished.
4085: and (5) carrying out finish machining on the second cambered surface to obtain the special-shaped part.
Illustratively, 4085 includes:
(1) And carrying out partition processing on the second cambered surface, wherein the second cambered surface is divided into a third feeding area and two fourth feeding areas, the third feeding area is positioned between the two fourth feeding areas, and the third feeding area is positioned at the bottom of the second cambered surface.
(2) The feed parameter of the third feed zone is 2-4 times the feed parameter of the fourth feed zone.
In the vertical processing machine tool, the second cambered surface faces to the main shaft of the machine tool. And after the supporting feet are pressed by the pressing plate (parts are arranged according to the direction of fig. 5), the second cambered surface is subjected to finish machining according to different feeding areas.
If the second cambered surface is finished, the same processing parameters are adopted by the cutter, and the bottom profile index of the second cambered surface is out of tolerance due to inertia when the cutter is fed again. Therefore, in order to improve the manufacturing precision of the special-shaped part, the second cambered surface is divided into a third feeding area and a fourth feeding area when the second cambered surface is finely milled.
Likewise, the width of the third feed zone is 1-1.5 times the cutter diameter.
By the method, the special-shaped part provided by the embodiment of the disclosure can be quickly manufactured.
According to the machining and manufacturing method for the special-shaped part, the plurality of first auxiliary positioning structures and the second auxiliary positioning structures are machined on the part body (namely the blank), the parts are tensioned and positioned in opposite directions through the first auxiliary positioning structures and the second auxiliary positioning structures, deformation generated during machining can be reduced, complicated tool design and existing clamping modes can be avoided, and finally machining precision of the parts is improved.
In addition, on the determination of the pressing force of the supporting leg, the optimal pressing force is determined by combining a theoretical simulation method, so that the deformation caused in the processing process meets the actual requirement. Meanwhile, different feeding areas are divided into the first cambered surface and the second cambered surface to be processed, so that the problem of out-of-tolerance profile of the bottoms of the first cambered surface and the second cambered surface is solved.
The foregoing description of the preferred embodiments of the present disclosure is provided for the purpose of illustration only, and is not intended to limit the disclosure to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and principles of the disclosure.
Claims (9)
1. The processing and manufacturing method of the special-shaped part is characterized by comprising the following steps of:
providing a blank, wherein the blank is of an aluminum alloy structure;
rough machining is carried out on the blank to obtain a first machined part, the first machined part comprises a body and a plurality of first auxiliary positioning structures, the body is provided with a first cambered surface, a second cambered surface and a plurality of supporting legs, the first cambered surface and the second cambered surface are positioned on two opposite sides of the body, the plurality of supporting legs are symmetrically positioned on two sides of the body in pairs by taking the axis of the first cambered surface as the axis, the plurality of first auxiliary positioning structures are connected with the body, are symmetrically positioned on the outer edge of the second cambered surface in pairs by taking the axis of the second cambered surface as the axis, the first auxiliary positioning structures are positioning blocks, the positioning blocks are provided with first connecting holes, and the first connecting holes are positioned on the surface of the positioning blocks far away from the second cambered surface, and the axis of the first connecting holes is perpendicular to the axis of the second cambered surface;
connecting the first connecting hole and the working platform through a fastener so as to fix the first machined part on the working platform;
and carrying out finish machining on the first machined part to obtain the special-shaped part.
2. The method of manufacturing according to claim 1, wherein the finishing the first workpiece to obtain the shaped part comprises:
finish machining is carried out on the first cambered surface;
the first workpiece is turned over and the supporting legs are pressed, so that the first workpiece is fixed on the working platform, and the second cambered surface faces the working platform;
and carrying out finish machining on the second cambered surface to obtain the special-shaped part.
3. The manufacturing method according to claim 2, wherein the finishing the first cambered surface includes:
carrying out partition processing on the first cambered surface, wherein the first cambered surface is divided into a first feeding area and two second feeding areas, the first feeding area is positioned between the two second feeding areas, and the first feeding area is positioned at the bottom of the first cambered surface;
the feed parameter of the first feed zone is 2-4 times the feed parameter of the second feed zone.
4. The manufacturing method according to claim 2, wherein the pressing the support leg to fix the first workpiece on the work table with the second arc surface facing the work table includes:
and compressing the supporting leg by adopting a target compressing force, wherein the target compressing force is larger than the minimum compressing force, and when compressing the supporting leg, the deformation in the simulation deformation stress analysis of the first workpiece is smaller than the set deformation.
5. The manufacturing method according to claim 4, wherein the minimum pressing force is calculated by:
wherein F is the minimum pressing force of the supporting leg; f (F) C Milling force for the tool; n is the number of the supporting feet; μ is a static friction coefficient between the supporting leg and the working platform;
the milling force of the tool is calculated according to the following formula:
F C ＝C f *k f *a p 0.95 *a f 0.80 *d 0 -1.10 *z*a e 1.1 ；
wherein F is C Milling force for the tool; c (C) f Is a material correction value; k (k) f Is a correction coefficient; a, a p Is axial cutting depth; a, a f Feed amount for each revolution; d, d 0 Is the diameter of the cutter; z is the number of teeth of the cutter; a, a e Is radial cut.
6. The manufacturing method according to claim 2, wherein the finishing the second cambered surface to obtain the special-shaped part comprises:
cutting off the first auxiliary positioning structure;
carrying out partition processing on the second cambered surface, wherein the second cambered surface is divided into a third feeding area and two fourth feeding areas, the third feeding area is positioned between the two fourth feeding areas, and the third feeding area is positioned at the bottom of the second cambered surface;
the feeding parameter of the third feeding zone is 2-4 times of the feeding parameter of the fourth feeding zone.
7. The method of manufacturing according to claim 2, wherein the roughing the blank to obtain a first workpiece comprises:
roughing a first side of the blank to form the first cambered surface;
processing the plurality of supporting legs and a plurality of second auxiliary positioning structures on two sides of the blank, wherein the plurality of second auxiliary positioning structures are symmetrically positioned on two sides of the first cambered surface in pairs by taking the central axis of the first cambered surface as an axis, and each second auxiliary positioning structure is positioned between two adjacent supporting legs;
fixing the blank on the working platform through the second auxiliary positioning structure;
rough machining is carried out on the second side face of the blank to form the second cambered surface and a plurality of first auxiliary positioning structures, and the first machined piece is obtained;
the finish machining is performed on the first machined part to obtain the special-shaped part, and the method further comprises the following steps:
and cutting off the second auxiliary positioning structure before finishing the first cambered surface.
8. The manufacturing method according to claim 7, wherein the second auxiliary positioning structure is a positioning column, the positioning column is provided with a second connecting hole, the second connecting hole is positioned on an end face of the positioning column far away from the second cambered surface, and the axis of the second connecting hole is perpendicular to the axial direction of the second cambered surface;
fixing the blank on the working platform through the second auxiliary positioning structure comprises the following steps:
and connecting the second connecting hole and the working platform through a fastener so as to fix the blank on the working platform.
9. The manufacturing method according to any one of claims 1 to 8, wherein before the first workpiece is fixed to the work table by the first auxiliary positioning structure, the manufacturing method further comprises:
the first workpiece is left to stand for a predetermined period of time to relieve the processing stress.
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| RU2089352C1 (en) * | 1995-05-30 | 1997-09-10 | Орловский государственный технический университет | Method of milling |
| JP2000288816A (en) * | 1999-04-05 | 2000-10-17 | Tokkyokiki Corp | Manufacture of curved arc face |
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| CN104259774B (en) * | 2014-09-09 | 2017-02-15 | 黄河科技学院 | Plane wing titanium alloy thin-wall web efficient numerical control machining technology |
| EP3778050B1 (en) * | 2018-03-30 | 2024-05-01 | JFE Steel Corporation | Method and device for bending edge of steel plate, and steel pipe manufacturing method and equipment |
| CN209868393U (en) * | 2019-05-06 | 2019-12-31 | 昆山金力达机械科技有限公司 | Thin-wall barrel-shaped part machining clamp |
| CN110465783B (en) * | 2019-08-21 | 2021-03-26 | 无锡市润和机械有限公司 | Machining method of split mounting type cylindrical casing of aero-engine |
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