CN114769688B - Method for processing deep notch of thin lug - Google Patents
Method for processing deep notch of thin lug Download PDFInfo
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- CN114769688B CN114769688B CN202210471657.0A CN202210471657A CN114769688B CN 114769688 B CN114769688 B CN 114769688B CN 202210471657 A CN202210471657 A CN 202210471657A CN 114769688 B CN114769688 B CN 114769688B
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- 238000012545 processing Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005520 cutting process Methods 0.000 claims abstract description 17
- 238000003754 machining Methods 0.000 claims description 56
- 238000003801 milling Methods 0.000 claims description 43
- 238000013461 design Methods 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 3
- 238000005056 compaction Methods 0.000 claims description 2
- 238000012916 structural analysis Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 7
- 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
- 238000003672 processing method Methods 0.000 abstract description 2
- 238000012797 qualification Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000007689 inspection Methods 0.000 description 3
- 206010044565 Tremor Diseases 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 229910001095 light aluminium alloy Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- 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
-
- 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)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
Abstract
The invention belongs to the field of metal cutting processing, and relates to a method for processing a deep slot 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 notch, the relative dimensional accuracy and the form and position tolerance of the lug are ensured, the processing qualification rate of the part is 100% from less than 50%, the processing of the lug with the similar structure has obvious reference significance, and particularly in the batch processing of the part, the processing method has obvious economic benefit, and is particularly suitable for processing the part with the structural characteristics of the deep groove and the thin lug made of the easily deformed material such as aluminum alloy.
Description
Technical Field
The invention belongs to the field of metal cutting processing, and relates to a method for processing a deep slot of a thin lug.
Background
In aerospace products, a large number of secondary load-carrying structural members are made of aerospace aluminum alloy plates as a preferred material. Wherein, most support arm class parts or connecting pieces have all designed tab and notch structure, and in the course of working, the notch takes place "binding off" or "opening" deformation easily, and tab thickness and form and position tolerance are difficult to guarantee. The aluminum alloy material is easy to deform, the stress balance inside the material can be necessarily destroyed in the notch machining process, the notch machining difficulty is caused by the influence of cutter tremble, and the sizes of the notch and the lug are difficult to guarantee.
The narrow groove and deep groove structures cannot be directly machined by a rod milling cutter, and most of the narrow groove and deep groove structures can only be machined by a T-shaped disc milling cutter. There are generally two types of conventional processing schemes:
the first is: after the whole machining of the part is finished by the numerical control milling, the notch is manually machined by a conventional milling machine to ensure the size, the machining scheme extremely depends on the machining experience of workers, the lug size and the position tolerance precision are difficult to control, and the machining deformation is extremely easy to occur and the part is scrapped. In actual production, for thick tab structures, notch "necking" is prone to occur, resulting in out-of-tolerance tab edge wall thickness. For the deep groove structure of the thin lug, notch opening and trembling are easy to occur, so that the lug is deformed, the local thickness dimension is large, and the notch precision is unqualified. In addition, the processing scheme has the characteristic of overlong processing period, poor processing economy and is replaced by a full numerical control processing mode at present.
The second is: and (3) full numerical control machining of parts: finish machining one side surface of the lug plate, and then rough finish milling a notch by adopting a disc milling cutter; and finally turning over the part and processing the surface of the lug on the other side. This scheme is comparatively practical to the structure that the thickness is great, and the notch is shallower, and structural adaptability is poor to thin tab and deep notch. In the actual processing of the thin lug and the deep slot structural part, the 'closing' or the 'opening' deformation occurs for many times, the deformation form is uncontrollable, and the dimension and the position tolerance precision of the lug are difficult to ensure.
Disclosure of Invention
In order to solve the problem that the notch size, the lug wall thickness size and the form and position tolerance of related structures are difficult to guarantee due to deformation factors in the processing process of the lug with the deep groove, the invention provides a more effective method for processing 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, structural analysis: analyzing the notch width, the notch depth, the lug thickness dimension and the tolerance requirement according to the part structure; and analyzing the parallelism, flatness and symmetry form and position tolerance requirements of the lug and notch structures.
Secondly, designing a cutter:
2.1 structural design of the cutter:
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 to be a, and the depth of the notch is set to be 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= [ (2b+20) +c ] mm of the disc cutter disc. Wherein 20mm is a safety margin reserved for preventing the cutter bar from colliding with the woolen; c is the cutter bar diameter. The swing and dynamic balance of the cutter head of the large-diameter disc milling cutter have great influence on the notch machining precision and the notch closing and opening, so that the advanced action balance inspection and the blade swing inspection are required after the cutter is assembled, and the influence of cutter factors on the notch machining precision is reduced.
2.2 tool parameter settings:
a) Rough machining parameters of the disc milling cutter: the rotation speed n=100deg.N/min, the feeding speed f=80mm/min, the cutting depth ap=6mm in the diameter direction of the cutter, the axial direction of the cutter is not layered, the cutting width=thickness H of the disc milling cutter.
b) Finishing parameters: the rotation speed n=200n/min, the feeding speed f=150mm/min, the cutter diameter cutting depth=notch depth b, and the cutting width=0.5 mm.
Thirdly, selecting a machine tool:
in view of the fact that the disc milling cutter is designed to be a split type cutter with large diameter and small thickness, in order to ensure the size and the precision of a notch, the linear speed of the cutter is small when a part is machined, so that high-speed equipment is not suitable for machining, the machining equipment selected in the scheme is a common numerical control milling machine, and low-speed performance is required to be good, and torque is high.
Fourthly, numerical control machining:
4.1 processing scheme sets: machining the two sides of the part, namely machining a notch when the first side is machined firstly, inserting a special cushion block into the notch after finishing the notch, and continuously machining the rest part of the first side; and (5) turning over and then processing the second surface. Considering that the disc milling cutter is of a split structure, the locking nut is adopted to screw down below the cutter head, the lowest point of the cutter is arranged at the top end of the cutter handle screw rod, the placing height of parts is required to be considered during processing, and the cutter is prevented from colliding with a machine tool workbench. In actual processing, a backing plate can be added below the woolen so as to raise the position and the height of the notch of the woolen. The outer edge of the part lug is 3 mm-5 mm away from the edge of the woolen. The first step is to process the notch under the state of the woolen, and the grooving deformation is controlled by the integral rigidity of the woolen.
4.2 numerical control machining: notch machining is divided into two steps of rough machining and finish machining.
(1) The rough milling notch processing mode is as follows: according to the middle size of the notch, the axial direction of the cutter is not layered, the upper surface and the lower surface of the inner surface of the notch are uniformly reserved with 0.5mm allowance, and the cutter is layered along the diameter aspect of the cutter and is processed in a reciprocating cycle.
(2) The finish milling notch processing mode is as follows: the notch inner side lower surface is processed first, and then the notch inner side upper surface is processed, thereby ensuring the notch width dimension. And during finish machining, the axial direction and the diameter direction of the cutter are not layered, and the cutter is formed by one-step machining. The outer cutter is arranged from the woolen, the cutter returns along the original path of the feed path after finishing the forward milling cutting, and the cut surface is trimmed again in a cutter back milling mode, so that the finish machining cutter relieving degree and the surface roughness can be reduced.
(3) The processing operation process comprises the following steps:
a) Machining a first surface of a part: a base plate is fixed on a machine tool platform, and the part blank is placed on the base plate for alignment and compaction. The notch part to be machined needs to be placed at the most edge position of the backing plate, so that the disc milling cutter is convenient to machine. Firstly, a rough milling notch procedure is processed, the size fluctuation quantity of the upper surface and the lower surface of the inner side of the notch relative to the theoretical position is checked, the cutter length is adjusted according to the fluctuation quantity, then the finish milling notch procedure is continuously processed, and the notch size processing step is completed. After the specially-made cushion block with the same width as the notch is inserted into the notch after finishing, firstly processing the surface of the upper lug, ensuring the thickness dimension of the lug, and then normally processing other structures of the part to finish the cutting work of the first surface of the part.
b) Machining a second surface of the part: the part is turned over, and the notch cushion block is not moved. The surface of the lug is firstly processed, the thickness dimension of the lug is ensured, and thus, the whole processing work of the lug and the notch is completed. And (5) normally machining other structures of the part, and finishing the cutting work of the second surface of the part. And (5) process connecting ribs are reserved on two sides of the lug when the lug is cut off.
c) And (3) unloading the parts from the woolen, checking the size of the notch, and arranging a correction procedure if the notch is deformed in an opening or opening way, so that the requirements on the size precision and the parallelism of the notch are ensured.
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 notch, the relative dimensional accuracy and the form and position tolerance of the lug are ensured, the processing qualification rate of the part is 100% from less than 50%, the processing of the lug with the similar structure has obvious reference significance, and particularly in the batch processing of the part, the processing method has obvious economic benefit, and is particularly suitable for processing the part with the structural characteristics of the deep groove and the thin lug made of the easily deformed material such as aluminum alloy.
Drawings
FIG. 1 is a typical part diagram;
FIG. 2 is a block diagram of a "T" shaped disc cutter;
FIG. 3 is a process flow effect diagram;
fig. 4 is a program trace schematic.
Wherein: 1, woolen material; 2 typical parts; 3, cushion blocks; 4-disc milling cutter; program feed path 5.
Detailed Description
Embodiments of the present invention will be described in detail below, the nature of the implementations being illustrated in the drawings, wherein like reference numerals refer to like elements or elements having the same or similar functions throughout. The embodiments described below by referring to the 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 narrow groove, deep groove and thin lug structure parts, and takes typical parts shown in figure 1 as examples and combines the figures to give the concrete implementation steps of the scheme of the invention:
1. analyzing the structural characteristics and the size requirements of the parts and the lugs, designing the size of the woolen to be 50mm larger than the theoretical outer edge of the parts on the upper side, the lower side and the left side, and ensuring the height in the processing process; to facilitate the disc cutter machining, the right side of the blank is 3mm from the outer edge of the part (i.e., the outer edge of the tab) (see FIG. 3). In order to prevent collision with the machine tool workbench, the structural characteristics of the disc milling cutter are combined. A 50mm thick backing plate is added below the woolen to raise the position and the height of the notch of the woolen.
2. Preparing procedure before numerical control machining: milling upper and lower planes and right-angle edges of the rough material to determine a machining origin.
3. And fixing the woolen and a 50 mm-thick backing plate on a machine tool workbench, straightening and aligning, and determining a machining origin. The woolen is pressed by a pressing plate. Wherein, the two pressing plates on the right side need to avoid the depth position of the notch to prevent the subsequent knife collision
4. Milling upper and lower two woolen evasion areas on the right side of the woolen (see fig. 3), the structure has two functions: firstly, can play the effect of releasing inside stress when fluting, secondly play the purpose of shortening disk milling cutter process time.
5. Rough machining a notch, programming and machining according to the middle size, and layering and machining according to the diameter direction of a cutter by the program; a margin of 0.5mm is uniformly reserved on the upper surface and the lower surface of the inner surface of the notch (the program track is shown in figure 4; the effect diagram is shown in figure 3).
6. And stopping the machine tool after the 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 woolen, and comparing the actual size with the theoretical size.
7. Finish machining the inner side lower surface of the groove opening: and (5) offsetting the program according to the deviation value of the comparison result, and ensuring the position accuracy of the notch. Radial delamination is avoided, and one knife is directly processed in place. The forward milling and the reverse milling are performed once each, the cutter track is that after the forward milling, the cutter is reversely milled to return to the program starting point according to the original sequence feed route (see figure 4). The back milling is used for finishing the cutter, preventing the cutter from being processed, ensuring the dimensional and form tolerance and reducing the surface roughness.
8. Finishing the upper surface of the inner side of the notch, and executing according to the 7 th step, so as to ensure the width dimension of the notch.
9. A cushion block with the same width as the notch is inserted into the notch, the surface of an lug at the upper part of the part is milled, and the thickness dimension of the lug is ensured; and processing the rest part of the structure. (see FIG. 3 for effect).
10. Turning over the woolen, straightening and aligning, and determining a machining origin.
11. The other tab surface is machined to ensure the tab thickness dimension (see fig. 3 for effect).
12. And processing the rest part of the structure. Cutting off the woolen material, and reserving the connecting ribs (the effect diagram is shown in figure 3).
13. Removing the parts and arranging a correction procedure; and sending the measured values to a measuring machine to measure the form and position tolerance of the lug. Thereby, the processing and inspection of the parts are completed.
Claims (4)
1. A method of machining a deep slot in a thin tab, comprising the steps of:
first, structural analysis: analyzing the notch width, the notch depth, the lug thickness dimension and the tolerance requirement according to the part structure; analyzing the parallelism, flatness and symmetry form and position tolerance requirements of the lug and notch structures;
secondly, designing a cutter:
2.1 structural design of the cutter:
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; setting the lug groove width of the part as a and the groove depth 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 safety margin reserved for preventing the cutter bar from colliding with the woolen; c is the cutter arbor diameter;
2.2 tool parameter settings:
a) Rough machining parameters of the disc milling cutter: the rotation speed n=100deg.N/min, the feeding speed f=80mm/min, the cutting depth ap=6mm in the diameter direction of the cutter, the axial direction of the cutter is not layered, the cutting width=thickness H of the disc milling cutter;
b) Finishing parameters: the rotation speed n=200n/min, the feeding speed f=150mm/min, the cutter diameter direction cutting depth=notch depth b, and the cutting width=0.5 mm;
thirdly, selecting a machine tool:
the equipment is a common numerical control milling machine;
fourthly, numerical control machining:
4.1, machining the two sides of the part, namely machining a notch when the first side is machined firstly, inserting a cushion block with the same width as the notch into the notch after finishing the notch, and continuously machining the rest part of the first side; turning over and then processing a second surface; the outer edge of the part lug is 3 mm-5 mm away from the edge of the woolen, the first working step is a processing notch in the woolen state, and the grooving deformation is controlled by the integral rigidity of the woolen;
4.2, notch processing is divided into two steps of rough processing and finish processing;
(1) the rough milling notch processing mode is as follows: according to the middle size of the notch, the axial direction of the cutter is not layered, the upper surface and the lower surface of the inner surface of the notch are uniformly reserved with 0.5mm allowance, layered along the diameter direction of the cutter and processed in a reciprocating cycle;
(2) the finish milling notch processing mode is as follows: firstly, machining the lower surface of the inner side of the notch, and then machining the upper surface of the inner side of the notch, thereby ensuring the width dimension of the notch; during finish machining, the axial direction and the diameter direction of the cutter are not layered, and the cutter is formed by one-step machining; and (3) discharging the outer cutter from the woolen, returning the cutter along the original path of the feed path after finishing the forward milling cutting, and finishing the cut surface again in a cutter back milling mode.
2. The method of machining a deep slot of a thin tab of claim 1, comprising the steps of: in the fourth step, the specific operation of machining the first surface of the part is as follows:
fixing a backing plate on a machine tool platform, and placing the part blank on the backing plate for alignment and compaction; the notch part to be processed needs to be placed at the most edge position of the backing plate, so that the disc milling cutter is convenient to process; firstly, machining a rough milling notch procedure, checking the size fluctuation quantity of the upper surface and the lower surface of the inner side of the notch relative to the theoretical position, and continuously machining a finish milling notch procedure after adjusting the cutter length according to the fluctuation quantity to finish the notch size machining step; after the cushion block with the same width as the notch is inserted into the notch after finishing, firstly processing the surface of the upper lug, ensuring the thickness dimension of the lug, and then normally processing other structures of the part to finish the cutting work of the first surface of the part.
3. A method of machining a deep slot in a thin tab as claimed in claim 1 or claim 2, comprising the steps of: in the fourth step, the specific operation of machining the second surface of the part is as follows: turning over the part, and keeping the notch cushion block motionless; firstly, processing the surface of the lug, ensuring the thickness dimension of the lug, and thus completing the whole processing work of the lug and the notch; normally machining other structures of the part, and finishing cutting work of a second surface of the part; and (5) process connecting ribs are reserved on two sides of the lug when the lug is cut off.
4. A method of machining a deep slot in a thin tab as claimed in claim 1 or claim 2, comprising the steps of: in the fourth step, the parts are detached from the woolen, the notch is deformed in a closing-up mode or a opening mode, and correction procedures are arranged to ensure the requirements on the size precision and the parallelism of the notch.
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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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| 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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| CN114769688A CN114769688A (en) | 2022-07-22 |
| CN114769688B true 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 |
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| 某典型支臂零件深槽高速加工研究;于洋等;装备制造技术;2015年(第11期);100-102 * |
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