CN114769688A - Method for processing deep notch of thin lug - Google Patents
Method for processing deep notch of thin lug Download PDFInfo
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- CN114769688A CN114769688A CN202210471657.0A CN202210471657A CN114769688A CN 114769688 A CN114769688 A CN 114769688A CN 202210471657 A CN202210471657 A CN 202210471657A CN 114769688 A CN114769688 A CN 114769688A
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- 238000012545 processing Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005520 cutting process Methods 0.000 claims abstract description 21
- 238000003801 milling Methods 0.000 claims description 45
- 238000003754 machining Methods 0.000 claims description 36
- 210000002268 wool Anatomy 0.000 claims description 10
- 238000013461 design Methods 0.000 claims description 5
- 238000012937 correction Methods 0.000 claims description 3
- 238000012916 structural analysis Methods 0.000 claims description 2
- 238000005056 compaction Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 6
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
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- 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
- B23C3/28—Grooving workpieces
- B23C3/30—Milling straight grooves, e.g. keyways
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2220/00—Details of milling processes
- B23C2220/36—Production of grooves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
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Abstract
The invention belongs to the field of metal cutting and processing, and relates to a method for processing a deep notch of a thin lug. By adopting the scheme, the processing deformation of the narrow groove, the deep groove and the thin lug structure is effectively controlled, the width of the groove opening, the related dimensional precision and the form and position tolerance of the lug are ensured, the processing qualified rate of the part reaches 100% from less than 50%, the processing of the lug with a similar structure has obvious reference significance, and the method is particularly suitable for processing the part which adopts the easily deformable materials such as aluminum alloy and has the structural characteristics of the deep groove and the thin lug, and has obvious economic benefit particularly in the batch processing of the part.
Description
Technical Field
The invention belongs to the field of metal cutting and processing, and relates to a method for processing a deep notch of a thin lug.
Background
In the aviation products, a large number of secondary load-bearing structural members adopt aviation aluminum alloy plates as the preferred materials. Wherein most branch arm class part or connecting piece have all designed auricle and notch structure, and in the course of working, the notch takes place "binding off" easily or "open one's mouth" warp, and auricle thickness and geometric tolerances are difficult to guarantee. The aluminum alloy material is easy to generate processing deformation, the stress balance inside the material can be destroyed in the notch processing process, the notch processing is difficult due to the influence of tool vibration, and the sizes of the notch and the lug are difficult to guarantee.
Narrow groove and deep groove structures can not be directly processed by a rod milling cutter generally, and most of the narrow groove and deep groove structures can only be processed by a T-shaped disc milling cutter. The traditional processing schemes are generally two types:
the first one is: after the whole part is machined by the numerical control milling machine, the notch is machined by a conventional milling machine manually to ensure the size, the machining scheme extremely depends on the machining experience of workers, the size and the position tolerance precision of the lug are difficult to control, and the machining deformation is easy to occur and the part is scrapped. In actual production, for a thick lug structure, notch closing-in is easy to occur, so that the wall thickness of the edge of the lug is ultra-poor. And for the deep groove structure of the thin lug, the notch is easy to open and vibrate, the lug deforms, the local thickness dimension is large, and the notch precision is unqualified. In addition, the machining scheme has the characteristics of overlong machining period and poor machining economy, and is basically replaced by a full numerical control machining mode at present.
The second method is as follows: and (3) full numerical control machining of parts: finishing the surface of one side of the lug plate, and roughly and finely milling a notch by using a disc milling cutter; and finally, turning over the part, and processing the surface of the lug plate on the other side. The scheme is more practical for the structure with larger thickness and shallower notch, and has poor adaptability to the structures of thin lug plates and deep notches. In the actual processing of thin lug and deep notch structural parts, the 'closing-in' or 'opening-opening' deformation appears for many times, the deformation form is uncontrollable, and the tolerance precision of the lug size and position is difficult to guarantee.
Disclosure of Invention
The invention provides a more effective method for processing a lug with a deep groove, aiming at solving the problem that the notch size, the lug wall thickness size and the form and location tolerance of a related structure are difficult to guarantee due to deformation factors in the processing process of the lug with the deep groove.
The technical scheme of the invention is as follows:
the method for processing the deep notch of the thin lug comprises the following steps:
first step, structural analysis: analyzing the width of the notch, the depth of the notch, the thickness of the lug and tolerance requirements according to the structure of the part; and (5) analyzing the form and position tolerance requirements of the parallelism, the flatness and the symmetry of the lug and the notch structure.
Step two, designing a cutter:
2.1 cutter structure design:
the cutter is of a T-shaped structure, and the disc milling cutter adopts a split design and is divided into a blade and a cutter bar. The width of the lug groove of the part is set as a, and the depth of the notch is set as b.
The thickness H of the disc milling cutter is 1mm smaller than the width a of the notch, namely: h ═ a-1) mm; the diameter D of the disc milling cutter head is [ (2b +20) + c ] mm. Wherein, 20mm is a reserved safety margin for preventing the cutter bar from colliding with the wool; c is the shank diameter. The swing and dynamic balance of the cutter head of the large-diameter disc milling cutter greatly influence the notch machining precision and the notch closing-in and opening-out, so that the action balance check and the blade swing check are carried out in advance after the cutter is assembled, and the influence of cutter factors on the notch machining precision is reduced.
2.2 setting the parameters of the cutter:
a) rough machining parameters of the disc milling cutter: the rotating speed n is 100n/min, the feeding speed f is 80mm/min, the cutting depth ap in the diameter direction of the cutter is 6mm, the cutter is not layered in the axial direction, and the cutting width is equal to the thickness H of the disc milling cutter.
b) Finishing parameters are as follows: the rotating speed n is 200n/min, the feeding speed f is 150mm/min, the cutting depth in the diameter direction of the cutter is notch depth b, and the cutting width is 0.5 mm.
Thirdly, selecting a machine tool:
in view of the design of the disc milling cutter into a split type cutter with large diameter and small thickness, in order to ensure the size and the precision of a notch and ensure that the linear speed of the cutter is small when a part is processed, high-speed equipment is not suitable for processing.
Fourthly, numerical control machining:
4.1 processing scheme setting: processing the part on two sides, namely processing a notch when processing the first side, inserting a special cushion block into the notch after finishing the notch, and continuously processing the rest part of the first side; and (5) turning over and then processing a second surface. Considering that the disc milling cutter is of a split structure, the locking nut is adopted below the cutter head to screw, the lowest point of the cutter is arranged at the top end of the screw rod of the cutter handle, the placing height of parts needs to be considered during machining, and the cutter is prevented from colliding with a machine tool workbench. During actual processing, a backing plate can be added below the wool so as to raise the position height of the wool notch. And the distance between the outer edge of the lug of the part and the edge of the wool is 3-5 mm. The first step is to process the notch in the state of the blank, and the deformation of the notch is controlled by the integral rigidity of the blank.
4.2, numerical control machining: the notch machining comprises two steps of rough machining and finish machining.
Firstly, the processing mode of roughly milling the notch is as follows: according to the middle size of the notch, the cutter is not layered in the axial direction, the upper surface and the lower surface of the inner surface of the notch are uniformly provided with a margin of 0.5mm, and the notch is layered along the diameter of the cutter and is processed in a reciprocating and circulating way.
Secondly, the machining mode of the finish milling notch is as follows: the lower surface of the inner side of the notch is firstly processed, and the upper surface of the inner side of the notch is then processed, so that the width dimension of the notch is ensured. The cutter is not layered in the axial direction and the diameter direction during fine processing, and is processed and formed at one time. And (3) cutting the blank from the outside, returning the cutter along the feed path after finishing the forward milling and cutting, and finishing the cut surface again in a cutter reverse milling mode, so that the finish machining cutter relieving degree and the surface roughness can be reduced.
Processing operation process:
a) processing a first surface of the part: a base plate is fixed on a machine tool platform, and the rough materials of the parts are placed on the base plate to be aligned and compressed. Wherein, the notch position to be processed needs to be placed at the most marginal position of the backing plate, so that the disc milling cutter can process conveniently. Firstly, a procedure of roughly milling the notch is processed, the variation of the upper surface and the lower surface of the inner side of the notch relative to the size of a theoretical position is checked, and a procedure of finely milling the notch is continuously processed after the length of a cutter is finely adjusted according to the variation to finish the notch size processing step. After inserting a special cushion block with the same width as the groove opening into the groove opening after finish machining, firstly machining the surface of the lug piece on the upper side to ensure the thickness and the size of the lug piece, and then normally machining other structures of the part to finish the cutting work of the first surface of the part.
b) Processing a second surface of the part: the part is turned over, and the notch cushion blocks are not moved. The surface of the lug is firstly processed, and the thickness and the size of the lug are ensured, so that the whole processing work of the whole lug and the notch is completed. And normally processing other structures of the part to finish the cutting work of the second surface of the part. And (4) leaving process connecting ribs on two sides of the lug when cutting.
c) And (3) detaching the part from the blank, checking the size of the notch, and arranging a correction procedure if the notch is subjected to 'opening' or 'mouth-opening' deformation to ensure the requirements of the size precision and the parallelism of the notch.
The invention has the beneficial effects that:
by adopting the scheme, the processing deformation of the narrow groove, the deep groove and the thin lug structure is effectively controlled, the width of the groove opening, the related dimension precision and the form and position tolerance of the lug are ensured, the part processing qualification rate reaches 100% from less than 50%, the method has obvious reference significance for processing the lug with the similar structure, and particularly has obvious economic benefit in the batch processing of parts.
Drawings
FIG. 1 is a typical part diagram;
FIG. 2 is a view of the structure of a "T" shaped disc cutter;
FIG. 3 is a process flow effect diagram;
fig. 4 is a program trajectory diagram.
Wherein: 1, preparing wool; 2 typical parts; 3, cushion blocks; 4, a disc milling cutter; 5 program feed trajectory.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
The invention provides a general solution for processing parts with narrow groove, deep groove and thin lug structure, and takes the typical part shown in figure 1 as an example and combines the accompanying drawings to give concrete implementation steps of the solution:
1. analyzing the structural characteristics and the size requirements of the part and the lug, and designing the specification of the blank to be 50mm larger than the theoretical outer edge of the part on the upper side, the lower side and the left side so as to ensure the height in the processing process; for the convenience of disc milling cutter processing, the right side of the blank is 3mm away from the outer edge of the part (i.e. the outer edge of the lug) (see figure 3). The combined structure of the disc milling cutter aims at preventing collision with a machine tool workbench. And a backing plate with the thickness of 50mm is added below the wool so as to raise the position height of the wool notch.
2. Preparation process before numerical control machining: and milling the upper plane, the lower plane and the right-angle edge of the blank to determine a processing original point.
3. Fixing the blank and a base plate with the thickness of 50mm on a machine tool workbench, straightening and aligning and determining a processing original point. And pressing the wool by a pressing plate. Wherein two pressure plates on the right side need to avoid the depth position of the notch to prevent subsequent cutter collision
4. The upper and lower two woolen dodging areas on the right side of the milled woolen (see fig. 3) have two functions: firstly, can play the effect of release internal stress when the fluting, secondly play the purpose that shortens disc milling cutter process time.
5. Roughly machining a notch, programming and machining according to the middle size, and machining the program in layers according to the diameter direction of the cutter; the upper and lower surfaces of the inner surface of the notch are uniformly provided with a 0.5mm allowance (the program track is shown in figure 4; the effect figure is shown in figure 3).
6. And stopping the machine tool after rough machining is finished, measuring the actual size from the lower surface of the inner side of the notch to the lower surface of the rough material, and comparing the actual size with the theoretical size.
7. Finish machining the inner lower surface of the notch: and (5) according to the deviation value deviation program of the comparison result, ensuring the position precision of the notch. The radial direction is not layered, and the cutting is directly processed in place. And (3) once respectively performing forward milling and backward milling, wherein after the tool path is forward milling, the tool returns to the starting point of the program by backward milling according to the original sequential feed route (see figure 4). The inverse milling is used for finishing the cutter, so as to prevent cutter back-off during processing, ensure the dimensional and form and position tolerance and reduce the surface roughness.
8. And (4) finishing the upper surface of the inner side of the notch according to the step (7) to ensure the width size of the notch.
9. Inserting a cushion block with the same width as the notch into the notch, milling the surface of an upper lug of the part, and ensuring the thickness dimension of the lug; and processing the rest part of the structure. (the effect figure is shown in figure 3).
10. Turning the rough material, straightening, aligning and determining a processing origin.
11. The other tab surface is machined to ensure the tab thickness dimension (see figure 3 for effect graph).
12. And processing the rest part of the structure. Cutting off the wool and leaving the connecting ribs (the effect figure is shown in figure 3).
13. Unloading the parts and arranging a correction process; and sending the measurement result to a measuring machine to measure the form and position tolerance of the lug. Thereby, the machining and inspection of the part are completed.
Claims (4)
1. The method for processing the deep notch of the thin lug is characterized by comprising the following steps of:
first step, structural analysis: analyzing the width of a notch, the depth of the notch, the thickness of a lug and tolerance requirements according to the structure of the part; analyzing the requirements of parallelism, planeness and symmetry form and position tolerance of the lug and the notch structure;
secondly, designing a cutter:
2.1 cutter structure design:
the cutter is in a T-shaped structure, and the disc milling cutter adopts a split design and is divided into a blade and a cutter bar; setting the width of a lug groove of the part as a and the depth of a notch as b;
the thickness H of the disc milling cutter is 1mm smaller than the width a of the notch, namely: h ═ a-1) mm; the diameter D of the cutter head of the disc milling cutter is [ (2b +20) + c ] mm; wherein, 20mm is a reserved safety margin for preventing the cutter bar from colliding with the wool; c is the cutter bar diameter;
2.2 setting the parameters of the cutter:
a) rough machining parameters of the disc milling cutter: the rotating speed n is 100n/min, the feeding speed f is 80mm/min, the cutting depth ap in the diameter direction of the cutter is 6mm, the axial direction of the cutter is not layered, and the cutting width is equal to the thickness H of the disc milling cutter;
b) finishing parameters are as follows: the rotating speed n is 200n/min, the feeding speed f is 150mm/min, the cutting depth in the diameter direction of the cutter is notch depth b, and the cutting width is 0.5 mm;
thirdly, selecting a machine tool:
the equipment is a common numerical control milling machine;
step four, numerical control machining:
4.1, processing the part on two sides, namely processing a notch when the first side is processed, inserting a special cushion block into the notch after the notch is processed finely, and continuously processing the rest part of the first side; turning over and then processing a second surface; reserving 3-5 mm of part lug outer edge from the edge of the blank, wherein the first step is to process a notch in the blank state, and the deformation of the notch is controlled by the integral rigidity of the blank;
4.2, numerical control machining: the notch processing comprises two steps of rough processing and finish processing;
firstly, a rough milling notch processing mode comprises the following steps: according to the size of the middle of the notch, the cutter is not layered in the axial direction, the upper surface and the lower surface of the inner surface of the notch are uniformly provided with a margin of 0.5mm, and the notch is layered along the diameter of the cutter and is subjected to reciprocating circular processing;
the processing mode of finish milling the notch is as follows: firstly, processing the lower surface of the inner side of the notch, and then processing the upper surface of the inner side of the notch, thereby ensuring the width dimension of the notch; in the fine processing, the cutter is not layered in the axial direction and the diameter direction and is processed and formed at one time; and (5) feeding a cutter from the outside of the blank, returning the cutter along the feed path after the forward milling and cutting are finished, and finishing the cut surface again in a cutter reverse milling mode.
2. The method of forming a deep slot in a thin ear of claim 1, comprising the steps of: in the fourth step, the specific operation of processing the first surface of the part is as follows:
fixing a base plate on a machine tool platform, and placing part blanks on the base plate for alignment and compaction; the notch part to be machined needs to be placed at the position of the most edge of the base plate, so that the disc milling cutter can conveniently machine the notch part; firstly, a procedure of roughly milling notches is processed, the variation of the upper and lower surfaces of the inner side of each notch relative to the size of a theoretical position is checked, and a procedure of finely milling the notches is continuously processed after the length of a cutter is finely adjusted according to the variation to finish the step of processing the sizes of the notches; after inserting a special cushion block with the same width as the groove opening into the groove opening after finish machining, firstly machining the surface of the lug piece on the upper side to ensure the thickness and the size of the lug piece, and then normally machining other structures of the part to finish the cutting work of the first surface of the part.
3. The method of machining a deep slot in a thin tab of claim 1 or 2, comprising the steps of: in the fourth step, the operation of processing the second surface of the part is as follows: turning over the part, and keeping the notch cushion block immovable; firstly, processing the surface of the lug plate to ensure the thickness and the size of the lug plate, thereby finishing the whole processing work of the whole lug plate and the notch; normally processing other structures of the part to finish the cutting work of the second surface of the part; and (5) leaving process connecting ribs on two sides of the lug when cutting.
4. The method of forming a deep slot in a thin tab of claim 1 or 2, comprising the steps of: and in the fourth step, the part is detached from the blank, the notch is subjected to opening or mouth opening deformation, a correction procedure is arranged, and the requirements on the size precision and the parallelism of the notch are met.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210471657.0A CN114769688B (en) | 2022-04-29 | 2022-04-29 | Method for processing deep notch of thin lug |
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| CN202210471657.0A CN114769688B (en) | 2022-04-29 | 2022-04-29 | Method for processing deep notch of thin lug |
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| CN114769688B CN114769688B (en) | 2024-03-08 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3355788A (en) * | 1964-10-20 | 1967-12-05 | Hudson Engineering Corp | A method of sawing slits in finned tubing |
| JPH0499607A (en) * | 1990-08-20 | 1992-03-31 | Disco Abrasive Syst Ltd | Method of adjusting blade in precise cutting device |
| DE202009006030U1 (en) * | 2009-04-22 | 2009-07-16 | Willi Stürtz Maschinenbau GmbH | Device for processing the end face of a plastic profile bar |
| CN201439134U (en) * | 2009-06-22 | 2010-04-21 | 宁波三峰机械电子有限公司 | Milling cutter for processing elongated slot of electronic choker shaft |
| CN102225480A (en) * | 2011-06-08 | 2011-10-26 | 沈阳飞机工业（集团）有限公司 | Method for machining joint with deep and narrow groove complicated structure |
| CN204295009U (en) * | 2014-11-14 | 2015-04-29 | 中航飞机股份有限公司西安飞机分公司 | The support Drilling Jig Structure of a kind of ears sheet part drilling |
| CN105537657A (en) * | 2016-03-17 | 2016-05-04 | 沈阳飞机工业（集团）有限公司 | Method for machining lug-type notch in numerical control mode |
-
2022
- 2022-04-29 CN CN202210471657.0A patent/CN114769688B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3355788A (en) * | 1964-10-20 | 1967-12-05 | Hudson Engineering Corp | A method of sawing slits in finned tubing |
| JPH0499607A (en) * | 1990-08-20 | 1992-03-31 | Disco Abrasive Syst Ltd | Method of adjusting blade in precise cutting device |
| DE202009006030U1 (en) * | 2009-04-22 | 2009-07-16 | Willi Stürtz Maschinenbau GmbH | Device for processing the end face of a plastic profile bar |
| CN201439134U (en) * | 2009-06-22 | 2010-04-21 | 宁波三峰机械电子有限公司 | Milling cutter for processing elongated slot of electronic choker shaft |
| CN102225480A (en) * | 2011-06-08 | 2011-10-26 | 沈阳飞机工业（集团）有限公司 | Method for machining joint with deep and narrow groove complicated structure |
| CN204295009U (en) * | 2014-11-14 | 2015-04-29 | 中航飞机股份有限公司西安飞机分公司 | The support Drilling Jig Structure of a kind of ears sheet part drilling |
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Non-Patent Citations (1)
| Title |
|---|
| 于洋等: "某典型支臂零件深槽高速加工研究", 装备制造技术, vol. 2015, no. 11, pages 100 - 102 * |
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