CN114310195A - Stable machining method for thin-wall edge strip inclined end face structure - Google Patents
Stable machining method for thin-wall edge strip inclined end face structure Download PDFInfo
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- CN114310195A CN114310195A CN202210061637.6A CN202210061637A CN114310195A CN 114310195 A CN114310195 A CN 114310195A CN 202210061637 A CN202210061637 A CN 202210061637A CN 114310195 A CN114310195 A CN 114310195A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000003754 machining Methods 0.000 title claims description 32
- 238000012545 processing Methods 0.000 claims abstract description 63
- 238000005520 cutting process Methods 0.000 claims abstract description 51
- 238000003801 milling Methods 0.000 claims abstract description 32
- 238000003672 processing method Methods 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 18
- 238000013461 design Methods 0.000 claims abstract description 13
- 238000005498 polishing Methods 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000011324 bead Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Abstract
The invention relates to a stable processing method of a thin-wall edge strip inclined end surface structure, which comprises the following steps: (1) performing fixed-axis line cutting on the bottom surface of the web plate of the thin-wall edge strip perpendicular to the design outline of the inclined end surface until a connecting allowance with the thickness of 0.3-0.8mm is left between the bottom surface of the web plate and the blank remainder, and stopping fixed-axis line cutting; (2) milling off the connection allowance of the cylindrical end mill perpendicular to the bottom surface of the thin-wall edge strip web along the designed profile of the inclined end surface to obtain a rough-machined inclined end surface structure; (3) and polishing the primary processing inclined end face structure to obtain the thin-wall edge strip inclined end face structure. The processing method can quickly and stably process the inclined end surface structure of the thin-wall edge strip in the processing process, reduces processing vibration, eliminates hidden troubles of cutter springing, broaching and clamping, greatly reduces the workload of bench workers for polishing, and obviously improves the production efficiency.
Description
Technical Field
The invention relates to the field of metal cutting machining, in particular to the field of numerical control machining of aviation structural parts, and particularly relates to a machining method of a thin-wall edge strip inclined end face structure.
Background
The end face of a wing beam part (thin-wall edge strip) is usually required to be processed into an inclined end face structure according to the requirements of design and assembly; in order to control the weight of the parts, the parts often have the characteristics of high side wall height, thin wall thickness and small rigidity; therefore, the machining difficulty is generally high when the inclined end face structure machining is performed on the parts.
When the traditional machining method is adopted to machine the inclined end face structure of the thin-wall edge strip of the wing beam, the end face is milled by adopting a longer tool swing angle (as shown in figure 1), so that the phenomena of tool bouncing, tool broaching, tool clamping and the like are easy to occur in the machining process. Meanwhile, in the machining process, in order to adapt to the inclined characteristic of the edge strip, the cutter also needs to be correspondingly set to a swing angleαAt the moment, the cutter and the edge strip processing surface form line contact, so that in the processing process, the cutter can be seriously vibrated due to tiny change, instability in the milling process is increased, the edge strip processing surface is more easily scratched and bruised by the vibration of the cutter, the quality of the processing surface is reduced, and subsequent assembly of the edge strip is influenced. On the other hand, in the traditional swing angle milling process, in order to avoid the risk of secondary milling damage to the processing surface caused by the buckling deformation of the part at the milling breaking moment of the end surface of the edge strip, a boss with the thickness of 0.5-1.0mm is left between the web plate and the blank for connection, the web plate needs to be manually broken down by a fitter in a subsequent process, the size of a file is corrected in place, the processing efficiency is low, the quality risk is possibly caused, and the rapid processing and application of the thin-wall edge strip inclined end surface structure are seriously influenced.
Disclosure of Invention
The invention aims to: aiming at the defects of poor stability and low efficiency of the existing processing method of the thin-wall edge strip inclined end surface structure, the processing method of the thin-wall edge strip inclined end surface structure is provided; the processing method can quickly and stably process the inclined end surface structure of the thin-wall edge strip in the processing process, avoids processing vibration, eliminates hidden troubles of cutter springing, broaching and clamping, greatly reduces the workload of bench workers for polishing, and obviously improves the production efficiency.
In order to achieve the purpose, the invention provides a method for processing a thin-wall edge strip inclined end surface structure, which comprises the following steps: (1) performing fixed-axis line cutting on the bottom surface of the web plate of the thin-wall edge strip perpendicular to the design outline of the inclined end surface until a connecting allowance with the thickness of 0.3-0.8mm is left between the bottom surface of the web plate and the blank remainder, and stopping fixed-axis line cutting;
(2) milling off the connection allowance of the cylindrical end mill perpendicular to the bottom surface of the thin-wall edge strip web along the designed profile of the inclined end surface to obtain a numerical control machining inclined end surface structure;
(3) and polishing the numerical control machining inclined end face structure to obtain the thin-wall edge strip inclined end face structure.
The invention relates to a processing method of a thin-wall edge strip inclined end surface structure, which is characterized in that the traditional swing angle milling processing method is replaced by a fixed axis line cutting processing method vertical to the bottom surface of a web plate, so that the contact surface between a cutter and a thin-wall edge strip during processing is obviously reduced, the acting force between the cutter and a processing surface is reduced, the cutter is not easy to vibrate, the processing surface of the edge strip cannot be scratched or bruised by the vibration of the cutter, the quality of the processing surface is better, the processing stability is better, the precision is higher, the workload of bench workers for polishing is greatly reduced, and the processing efficiency is obviously improved.
Preferably, in the step (1), the thin-wall edge strip is a metal edge strip with a side wall thickness of less than 1.5mm and a ratio of the side wall thickness to the height of more than 20; the metal edge strip comprises an aluminum alloy edge strip, a titanium alloy, a stainless steel edge strip and the like; the thin-wall edge strip has the characteristics of high side wall height, thin wall thickness and low rigidity, and when the inclined end surface structure is processed by adopting a traditional processing method, the problems of tool bouncing, tool broaching, tool clamping and the like are more likely to occur, so that the problems of low quality percent of pass and low processing efficiency of the processed inclined end surface structure of the thin-wall edge strip are caused, and the rapid processing and application of the inclined end surface structure thin-wall edge strip are seriously influenced.
Wherein, preferably, in the step (1), when the fixed-axis line cutting processing is carried out, the line cutting depth of each layer is not more than 0.3 mm; the depth of each layer of line cutting can be properly adjusted according to the material of the edge strip, the line cutting depth is too large, the contact surface of the milling cutter and the side wall of the thin-wall edge strip is larger, so that the stress is larger, the processing flutter and cutter ejection are more easily caused, the processing stability is poorer, and the processing time is too long due to too small line cutting depth; most preferably, the row-cut depth of each layer is 0.2-0.3 mm.
Preferably, in the step (1), during fixed-axis line cutting, the motion track of the milling cutter is unidirectional forward milling, and the lower cutting point is arranged at an empty cutting position; the unidirectional forward milling means that after a cutter movement track is processed into a layer along the same horizontal height according to the forward milling processing direction, the cutter track descends a cutting depth (the row cutting depth of each layer) at the lower cutter point to cut the next layer, and the cutting direction of each layer is along the forward milling processing direction; the lower tool point is at the idle cutting position because the tool at the position of the lower tool point can axially move downwards, the cutting force is large at the moment, the tool and the edge strip are easy to vibrate, if the lower tool point is not on the edge strip, the edge strip cannot vibrate, and if the lower tool point is at the idle cutting position (outside the thin-wall edge strip), no vibration exists; if the lower tool point is on the edge strip, the thin-wall edge strip is easy to vibrate originally in the processing process, and if the lower tool point is on the edge strip, the thin-wall edge strip is easy to vibrate; the optimized milling cutter has smaller movement track and lower cutter position, has smaller cutting force, is less prone to causing machining flutter and cutter bouncing, has better machining stability and better machined surface quality.
In the step (1), the transverse width a of the fixed-axis line cutting track is greater than the sum of the transverse width b of the thin-wall edge strip and the diameter d of the cutter; the maximum longitudinal width c of the fixed axis line cutting track is larger than the sum of the longitudinal projection length e of the inclined end face and the diameter d of the cutter; preferably, wherein 1.1d < a-b < 1.5 d; c-e is more than 1.5d and less than 2 d; the optimized range can shorten the motion track of the milling cutter, and has better stability, higher processing precision and higher efficiency.
Wherein, in the step (2), the milling is one-time milling; when the cutter completely mills off the end face of the edge strip of the part to be connected with the excess blank, the part takes the nearest pressing boss as a fulcrum to generate warping deformation, and the part does not contact the cutter in the warping process; and a cutter is milled and broken, so that the phenomenon that the cutter is continuously contacted with the end face of the edge strip which is not connected after milling and machining to cause part vibration and cutter bouncing is avoided.
In order to achieve the above object, the present invention further provides a method for processing a thin-wall edge strip with an inclined end face structure, including the following steps:
(1) clamping and positioning the rough blank of the part to be processed according to the processing requirement, and establishing a processing coordinate system;
(2) processing a non-inclined end face structure of a rough blank of a part to be processed by using a traditional milling method according to design requirements to obtain a thin-wall edge strip;
(3) and (3) processing the inclined end surface structure on the thin-wall edge strip by adopting the processing method according to the design requirement to obtain the thin-wall edge strip with the inclined end surface structure.
The processing method of the thin-wall edge strip with the inclined end face structure has the advantages of high processing precision, good processing surface quality, small bench worker polishing amount and high processing efficiency, and is beneficial to large-scale processing and application of the thin-wall edge strip with the inclined end face structure.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the processing method of the inclined end face structure provided by the invention has the advantages that the contact surface between the cutter and the thin-wall edge strip during processing is obviously reduced, the vibration of the cutter is avoided, the processed surface of the edge strip cannot be scratched or bruised by the vibration of the cutter, and the quality and the qualified rate of the processed surface are obviously improved (the qualified rate is improved by 35%).
2. The processing method of the inclined end face structure can eliminate the hidden troubles of elastic cutter, broach and clamping cutter in the processing process, remarkably improve the processing stability, and greatly reduce the workload of bench workers for polishing, thereby remarkably improving the processing efficiency (the total processing time is shortened by more than 38%).
3. The processing method of the inclined end face structure has simple processing steps, is convenient to operate and easy to implement, and can be used for processing the thin-wall edge strip with the inclined end face structure in a large scale.
Drawings
FIG. 1 is a schematic view of a thin-walled bead angled end face structure machined by a conventional method;
FIG. 2 is a schematic view of the machining path of the fixed-axis line cutting of the thin-wall edge strip inclined end face structure of the present invention;
FIG. 3 is a schematic view of a milling-cut processing trajectory of the thin-wall bead inclined end face structure of the present invention;
FIG. 4 is a schematic representation of a thin-walled bead prior to fabrication of the angled end face structure;
FIG. 5 is a schematic view of the present invention for processing a thin-walled bead angled end face configuration;
FIG. 6 is a schematic view of a thin-walled rim of the present invention after the completion of machining an angled end face structure;
the labels in the figure are: 1-blank excess material; 2-linking the balance; 3-vertical cutting point; 4-inclined end face structure; 5-thin wall edge strip; 6-side wall; 7-web bottom surface; 8-fixed axis line cutting track; 9-milling off the track; 10-a cutter; 11-inclined end face design profile.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the specific embodiment of the invention, the thin-wall edge strip (figure 4) adopted in the processing experiment is made of aluminum alloy with the material brand of 7050-T7451, the height of the side wall of the edge strip is 21mm, the thickness of the side wall of the edge strip is 0.8mm, the thickness of the bottom surface of a web plate is 1.5mm, and the width of the edge strip is 28 mm; the machining cutter is a cylindrical end mill with D12-40R 3; the inclined end face is designed to have an inclination angle of 45 degrees.
Example 1
A method of forming a thin-walled bead inclined end face structure (fig. 5), comprising the steps of:
(1) performing fixed-axis line cutting (figure 2) on the bottom surface of the web plate of the cylindrical end mill perpendicular to the thin-wall edge strip along the design outline of the inclined end surface until a connecting allowance with the thickness of 0.5mm is left between the bottom surface of the web plate and the blank remainder, and stopping the fixed-axis line cutting; wherein, when the fixed-axis line cutting processing is carried out, the line cutting depth of each layer is 0.3 mm; the motion trail is one-way forward milling (the rotating speed of a machine tool is S =20000r/min, the fixed-axis line-cutting feeding speed is F =8000 mm/min); the transverse width a of the fixed-axis line cutting track is set to be 39 mm; the maximum longitudinal width of the fixed-axis line cutting track is 47 mm;
(2) a cylindrical end mill is perpendicular to the bottom surface of the thin-wall edge strip web plate along the design contour of the inclined end surface, and the connection allowance (figure 3) is milled off (the milling link feeding speed is 3000 mm/min) to obtain a numerical control machining inclined end surface structure (figure 6);
(3) and polishing the numerical control machining inclined end face structure to obtain the thin-wall edge strip inclined end face structure.
Example 2
A processing method of a thin-wall edge strip inclined end surface structure comprises the following steps:
(1) performing fixed-axis line cutting on the bottom surface of a web plate of the thin-wall edge strip perpendicular to the design outline of the inclined end surface by a cylindrical end mill until a connecting allowance with the thickness of 0.8mm is left between the bottom surface of the web plate and the blank allowance, and stopping the fixed-axis line cutting (the rotating speed of a machine tool is S =20000r/min, and the feeding speed of the fixed-axis line cutting is F =8000 mm/min); wherein, when the fixed-axis line cutting processing is carried out, the line cutting depth of each layer is 0.2 mm; the motion trail is unidirectional forward milling; the transverse width a of the fixed-axis line cutting track is set to be 43 mm; the maximum longitudinal width of the fixed-axis line cutting track is 52 mm;
(2) a cylindrical end mill is perpendicular to the bottom surface of the thin-wall edge strip web plate along the design contour of the inclined end surface, and the connection allowance is milled off (the milling link feeding speed is 3000 mm/min), so that a numerical control machining inclined end surface structure is obtained;
(3) and polishing the numerical control machining inclined end face structure to obtain the thin-wall edge strip inclined end face structure.
Comparative example 1:
machining by adopting a traditional machining method of swing angle milling (figure 1); processing parameters are as follows: the machine tool rotation speed S =20000r/min, and the feeding speed F =4000 mm/min; axially cutting to 1mm depth; radially milling 2 layers (the cutting width of the first layer is 12mm, and the cutting width of the second layer is 2 mm); after numerical control machining, a boss with the thickness of 0.8mm is reserved on the bottom surface of the web plate and is connected by a bench worker, and the web plate is broken and corrected in place by the size of the error.
Experimental example:
the processing methods in the embodiments 1-2 and the comparative example 1 of the invention are respectively adopted to process the thin-wall edge strip inclined end surface structure, 20 pieces of thin-wall edge strip inclined end surface structures are processed in each group, then the numerical control processing time, the bench worker polishing time and the part processing quality of the inclined end surface are counted, and the results are as follows:
| serial number | Numerical control average processing time (min) | Average bench work time (min) for polishing | Numerical control machining tool flicking failure times | Number of file size repair failures by bench worker | Percent pass (%) |
| Example 1 | 1.3 | 2 | 0 | 0 | 100 |
| Example 2 | 1.9 | 2.5 | 0 | 0 | 100 |
| Comparative example 1 | 1.1 | 6 | 6 | 1 | 65 |
Compared with experimental results, the processing method for the thin-wall edge strip inclined end surface structure of the aluminum alloy can effectively prevent the cutter from being flicked in the processing process and avoid the cutter from vibrating, so that the qualification rate of processed products is obviously improved, and within the experimental times of the invention, the qualification rate reaches 100 percent, although the numerical control processing average time can be improved to a certain extent, the average grinding time of a bench worker is greatly shortened, so that the total processing time of the thin-wall edge strip inclined end surface structure is obviously shortened (less than 4.4 min); in the comparative example 1, the traditional processing method is adopted, although the numerical control processing time is short, the bench worker polishing time is obviously prolonged, and particularly, in the processing process, the cutter bouncing faults occur for many times, so that the qualified rate of processed products is only 65%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A stable processing method of a thin-wall edge strip inclined end surface structure is characterized by comprising the following steps:
(1) performing fixed-axis line cutting on the bottom surface of the web plate of the thin-wall edge strip perpendicular to the design outline of the inclined end surface until a connecting allowance with the thickness of 0.3-0.8mm is left between the bottom surface of the web plate and the blank remainder, and stopping fixed-axis line cutting;
(2) milling off the connection allowance of the cylindrical end mill perpendicular to the bottom surface of the thin-wall edge strip web along the designed profile of the inclined end surface to obtain a numerical control machining inclined end surface structure;
(3) and polishing the numerical control machining inclined end face structure to obtain the thin-wall edge strip inclined end face structure.
2. The process of claim 1 wherein said thin-walled rim is a metal rim having a sidewall thickness of less than 1.5mm and a sidewall thickness to height ratio of greater than 20.
3. The process of claim 1, wherein in the step (1), the row-cutting depth of each layer is not more than 0.3mm in the fixed-axis row-cutting process.
4. A process according to claim 3 wherein the row cut depth of each layer is from 0.2 to 0.3 mm.
5. The machining method according to claim 1, wherein in the step (1), in the fixed-axis row cutting machining, the motion track of the milling cutter is unidirectional forward milling, and the lower cutting point is set at a free cutting position.
6. The process of claim 1, wherein in step (1), the transverse width a of the fixed axis row cut trajectory is greater than the sum of the transverse width b of the thin-wall rim strip and the diameter d of the tool; the maximum longitudinal width c of the fixed axis line cutting track is larger than the sum of the longitudinal projection length e of the inclined end face and the diameter d of the cutter.
7. The process of claim 6, wherein 1.1d < a-b < 1.5 d; 1.5d < c-e < 2 d.
8. The process of claim 1, wherein in step (2), said milling is a one-off milling.
9. A method for processing a thin-wall edge strip with an inclined end face structure is characterized by comprising the following steps:
(1) clamping and positioning the rough blank of the part to be processed according to the processing requirement, and establishing a processing coordinate system;
(2) processing a non-inclined end face structure of a rough blank of a part to be processed by using a traditional milling method according to design requirements to obtain a thin-wall edge strip;
(3) the thin-wall edge strip with the inclined end face structure is obtained by machining the inclined end face structure on the thin-wall edge strip according to the design claim by using the machining method of any one of claims 1 to 8.
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2022
- 2022-01-19 CN CN202210061637.6A patent/CN114310195A/en active Pending
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| JP2003165012A (en) * | 2001-11-30 | 2003-06-10 | Ishikawajima Harima Heavy Ind Co Ltd | Cutting method of thin member |
| CN102581360A (en) * | 2012-03-22 | 2012-07-18 | 沈阳飞机工业（集团）有限公司 | Method for processing complex curved surface by numerical control processing progressive interpolation |
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| CN105171077A (en) * | 2015-08-28 | 2015-12-23 | 湖北三江航天险峰电子信息有限公司 | Composite slope milling processing method capable of highly precisely controlling surface roughness |
| CN112317823A (en) * | 2020-09-30 | 2021-02-05 | 成都飞机工业（集团）有限责任公司 | Milling method for independent boss |
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Application publication date: 20220412 |