CN112620755B - Numerical control machining method for thin-wall high-edge strip groove cavity - Google Patents
Numerical control machining method for thin-wall high-edge strip groove cavity Download PDFInfo
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- CN112620755B CN112620755B CN202011428610.3A CN202011428610A CN112620755B CN 112620755 B CN112620755 B CN 112620755B CN 202011428610 A CN202011428610 A CN 202011428610A CN 112620755 B CN112620755 B CN 112620755B
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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
- B23C3/34—Milling grooves of other forms, e.g. circumferential
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Abstract
The invention relates to the technical field of numerical control machining, in particular to a numerical control machining method of a thin-wall high-edge strip groove cavity, which comprises semi-finish machining and finish machining, wherein when the finish machining is carried out, the shape in the groove cavity is simultaneously machined by adopting an alternative milling method of forming a layer of inner shape and a layer of outer shape; when the thin-wall high-edge strip groove cavity is an open groove cavity, continuously milling the inner and outer circles, wherein the processing tool path is a continuous closed curve of each layer; when the thin-wall high-edge strip groove cavity is a closed groove cavity, the inner shape and the outer shape are milled alternately in a single layer mode, and the machining tool path is a discontinuous curve formed by segmenting the inner shape and the outer shape. By the method, the rigidity of the part in the machining process is improved, and the problems of part deformation, machining vibration and low machining efficiency can be effectively solved.
Description
Technical Field
The invention relates to the technical field of numerical control machining, in particular to a numerical control machining method for a thin-wall high-margin strip groove cavity.
Background
With the rapid development of the aviation industry, the performances of high speed, high maneuverability, safe reliability, long service life and the like of a novel airplane are continuously improved, and increasingly severe requirements are provided for the structural characteristics of airplane structural members. In order to reduce the weight of the airplane and enhance the structural strength, a large number of thin-wall high-edge strip groove cavity structures are adopted in the airplane design and manufacturing process, the height-thickness ratio of the edge strips of the parts is small, the structural rigidity is weak, the stability in the processing process is poor, and the vibration is easy to occur, so that the problem of the processing quality of the parts is caused.
At present, the traditional processing scheme of the thin-wall high-edge strip part is to process the inner shape of the groove cavity in place and then process the appearance of the groove cavity, or process the outer shape of the groove cavity in place and then process the inner shape of the groove cavity. However, after one side of the edge strip is machined in place, the thickness of the edge strip is integrally reduced, the rigidity is greatly reduced, and the edge strip is vibrated due to overlarge cutting force when the other side of the edge strip is machined, so that the cutter is flicked, and even the wall thickness of the edge strip is out of tolerance and parts are scrapped. In order to avoid the cutter pulling caused by the elastic cutter in the machining process as much as possible, the cutting force is reduced by reducing cutting parameters such as cutting width, cutting depth, feeding speed and the like in actual production, but the method greatly reduces the machining efficiency.
Disclosure of Invention
In order to solve the technical problems, the invention provides a numerical control machining method of a thin-wall high-margin groove cavity, which adopts a method of alternately milling and simultaneously machining the inner appearance, improves the rigidity of a part in the machining process, and can effectively solve the problems of part deformation, machining vibration and low machining efficiency.
The invention is realized by adopting the following technical scheme:
a numerical control machining method for a thin-wall high-edge strip groove cavity comprises semi-finish machining and finish machining, and is characterized in that: during fine machining, the shape in the groove cavity is machined simultaneously by adopting an alternate milling method of forming a layer of inner shape and a layer of outer shape; when the thin-wall high-edge strip groove cavity is an open groove cavity, continuously milling the inner and outer circles, wherein the processing tool path is a continuous closed curve of each layer; when the thin-wall high-edge strip groove cavity is a closed groove cavity, the inner and outer shapes are milled alternately in a single layer mode, and the machining tool path is a discontinuous curve formed by segmenting the inner and outer shapes.
After the semi-finishing is finished, judging whether the allowance left by the semi-finishing inner shape is larger than the cutting width of the finishing, if so, adopting a radial layered processing mode when the semi-finishing inner shape is finished; if not, a radial layering processing mode is not adopted.
When the height-thickness ratio of the thin-wall high edge strip is less than 15-20, the side surface of the semi-finishing edge strip is left with equal thickness allowance; when the height-thickness ratio of the thin-wall high edge strip is greater than 20, a step-shaped allowance is left on the side surface of the semi-finishing edge strip.
When the shape in the groove cavity is finely processed, the allowance of the last radial layer is not less than 3-5 mm.
When the shape in the groove cavity is finely processed, the axial cutting depth is 2-5 mm.
Compared with the prior art, the invention has the beneficial effects that:
1. when the thin-wall high-edge strip structural part is subjected to finish machining, the method of alternately milling and simultaneously machining the inner appearance is adopted to machine the thin-wall high-edge strip structural part, so that the rigidity and the stability of the part in the machining process can be greatly improved, the part is effectively prevented from deforming and vibrating during machining, the problem of tool bouncing during finish machining is avoided, and the machining efficiency and the surface quality of the thin-wall high-edge strip part are improved.
2. The allowance of the radial last layer of finish machining cannot be too large or too small, if the allowance is too large, the cutting force and the cutting heat are greatly increased, and further the machining precision and the surface quality of the part are influenced.
3. When the height-thickness ratio of the thin-wall high edge strip is less than 15-20, the rigidity is relatively good, equal-thickness allowance can be reserved in semi-finishing, the numerical control programming difficulty is reduced, and the machining efficiency is improved. When the height-thickness ratio is greater than 20, the rigidity is weaker, stepped allowance is left on the side surface during semi-finishing, namely, the allowance of the side surface of the edge strip is gradually increased from top to bottom, and the aim of increasing the rigidity of the part can be achieved.
4. The allowance of the last radial layer is not less than 3-5 mm, so that the rigidity and stability of the thin-wall high-edge strip in the finish machining process can be guaranteed, the phenomenon of cutter bouncing is avoided, and parts are milled and damaged. The axial cutting depth is 2-5 mm, and the finish machining efficiency can be improved.
Drawings
The invention will be described in further detail with reference to the following description taken in conjunction with the accompanying drawings and detailed description, in which:
FIG. 1 is a schematic flow chart of a processing method of the present invention;
FIG. 2 is a schematic diagram comparing a conventional finishing process of the present invention with a finishing process of the present invention, wherein FIG. a is the conventional finishing process and FIG. b is the finishing process of the present invention;
FIG. 3 is a schematic view of an open pocket finishing tool path of the present invention;
FIG. 4 is a schematic view of a closed pocket finishing tool path of the present invention.
Detailed Description
Example 1
The invention comprises a numerical control machining method of a thin-wall high-margin strip groove cavity as a basic embodiment of the invention, and comprises semi-finishing and finishing. And during fine processing, the shape in the groove cavity is processed simultaneously by adopting an alternate milling method of forming a layer of inner shape and a layer of outer shape. When the thin-wall high-edge strip groove cavity is an open groove cavity, continuously milling the inner and outer circles, wherein the processing tool path is a continuous closed curve of each layer; when the thin-wall high-edge strip groove cavity is a closed groove cavity, the inner and outer shapes are milled alternately in a single layer mode, and the machining tool path is a discontinuous curve formed by segmenting the inner and outer shapes.
Example 2
The invention comprises a numerical control machining method of a thin-wall high-margin strip groove cavity as a preferred embodiment of the invention, and the method comprises semi-finishing and finishing. And in the semi-finishing process, when the height-thickness ratio of the thin-wall high edge strip is less than 15, the side surface of the semi-finishing edge strip is left with equal thickness allowance. After the semi-finishing is finished, judging whether the allowance left by the semi-finishing inner shape is larger than the cutting width of the finishing, if so, adopting a radial layered processing mode when the semi-finishing inner shape is finished; if not, the radial layering processing mode is not adopted. When the specific finishing process is carried out, referring to the attached figure 1 and the attached figure 3 of the specification, the shape in the groove cavity is simultaneously processed by adopting an alternative milling method of a layer of inner shape and a layer of outer shape. When the thin-wall high-edge strip groove cavity is an open groove cavity, the inner and outer shape continuous coils are milled, and the processing tool path is a continuous closed curve of each layer. And during fine machining, the axial cutting depth Ap is 2mm, and the allowance Ae of the last radial layer is not less than 3 mm.
Example 3
The invention comprises a numerical control machining method of a thin-wall high-margin strip groove cavity as another preferred embodiment of the invention, and the numerical control machining method comprises semi-finishing and finishing. And in the semi-finishing process, when the height-thickness ratio of the thin-wall high edge strip is greater than 20, the side surface of the semi-finishing edge strip is left with step-shaped allowance. And during fine processing, the shape in the groove cavity is processed simultaneously by adopting an alternate milling method of forming a layer of inner shape and a layer of outer shape. The axial cutting depth Ap is 5mm, and the allowance Ae of the last radial layer is not less than 5 mm. Referring to the attached figure 4 of the specification, when the thin-wall high-edge strip groove cavity is a closed groove cavity, the inner shape and the outer shape are milled alternately in a single layer mode, and the machining tool path is a discontinuous curve formed by segmenting the inner shape and the outer shape.
Example 4
The invention comprises a numerical control machining method of a thin-wall high-margin strip groove cavity as a best mode, and comprises semi-finishing and finishing. When the height-thickness ratio of the thin-wall high edge strip is less than 20, the side surface of the semi-finishing edge strip is left with equal thickness allowance; when the height-thickness ratio of the thin-wall high edge strip is greater than 20, a step-shaped allowance is left on the side surface of the semi-finishing edge strip. After the semi-finishing is finished, judging whether the allowance left by the semi-finishing inner shape is larger than the cutting width of the finishing, if so, adopting a radial layered processing mode when the semi-finishing inner shape is finished; if not, the radial layering processing mode is not adopted.
When the fine machining is carried out, referring to the attached drawing 1 and the attached drawing 2 of the specification, the shape of the groove cavity is not machined in place, and the shape of the groove cavity is machined, or the shape of the groove cavity is machined in place and the shape of the groove cavity is machined. But rather that
And (3) processing the shapes in the groove cavities simultaneously by adopting an alternative milling method of forming one layer of inner shapes and one layer of outer shapes. When the thin-wall high-edge strip groove cavity is an open groove cavity, continuously milling the inner and outer circles, wherein the processing tool path is a continuous closed curve of each layer; when the thin-wall high-edge strip groove cavity is a closed groove cavity, the inner and outer shapes are milled alternately in a single layer mode, and the machining tool path is a discontinuous curve formed by segmenting the inner and outer shapes.
When the shape in the groove cavity is finely processed, the axial cutting depth is 4mm, and the allowance of the last radial layer is not less than 4 mm.
In summary, after reading the present disclosure, those skilled in the art should make various other modifications without creative efforts according to the technical solutions and concepts of the present disclosure, which are within the protection scope of the present disclosure.
Claims (4)
1. A numerical control machining method for a thin-wall high-edge strip groove cavity comprises semi-finish machining and finish machining, and is characterized in that: during fine machining, the shape in the groove cavity is machined simultaneously by adopting an alternate milling method of forming a layer of inner shape and a layer of outer shape; when the thin-wall high-edge strip groove cavity is an open groove cavity, continuously milling the inner and outer circles, wherein the processing tool path is a continuous closed curve of each layer; when the thin-wall high-edge strip groove cavity is a closed groove cavity, the inner and outer shapes are milled alternately in a single layer, and the processing tool path is a discontinuous curve formed by segmenting the inner and outer shapes; when the height-thickness ratio of the thin-wall high edge strip is less than 15-20, the side surface of the semi-finishing edge strip is left with equal thickness allowance; when the height-thickness ratio of the thin-wall high edge strip is greater than 20, a step-shaped allowance is left on the side surface of the semi-finishing edge strip.
2. The numerical control machining method for the thin-wall high-margin strip groove cavity as claimed in claim 1, characterized in that: after the semi-finishing is finished, judging whether the allowance left by the semi-finishing inner shape is larger than the cutting width of the finishing, if so, adopting a radial layered processing mode when the semi-finishing inner shape is finished; if not, the radial layering processing mode is not adopted.
3. The numerical control machining method for the thin-wall high-margin strip groove cavity as claimed in claim 2, characterized in that: when the shape in the groove cavity is finely processed, the allowance of the last radial layer is not less than 3-5 mm.
4. The numerical control machining method for the thin-wall high-margin strip groove cavity as claimed in claim 3, characterized in that: when the shape in the groove cavity is finely processed, the axial cutting depth is 2-5 mm.
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| CN202011428610.3A CN112620755B (en) | 2020-12-09 | 2020-12-09 | Numerical control machining method for thin-wall high-edge strip groove cavity |
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| CN202011428610.3A CN112620755B (en) | 2020-12-09 | 2020-12-09 | Numerical control machining method for thin-wall high-edge strip groove cavity |
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| CN113369822A (en) * | 2021-06-29 | 2021-09-10 | 贵州黎阳国际制造有限公司 | Cutting forming method for L-shaped thin-wall ring piece |
| CN116551335B (en) * | 2023-07-07 | 2023-10-03 | 成都飞机工业（集团）有限责任公司 | L-shaped part machining method and L-shaped part |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102581362A (en) * | 2012-03-22 | 2012-07-18 | 沈阳飞机工业（集团）有限公司 | Method for processing part with thin wall and changed-angle curved surface appearance |
| CN104227103A (en) * | 2014-07-24 | 2014-12-24 | 西安航空学院 | Method for stepped symmetrical milling of thin-wall part |
| CN104741877A (en) * | 2015-04-02 | 2015-07-01 | 中航飞机股份有限公司西安飞机分公司 | Numerical control machining method for U-shaped cavity thin wall edge strip type titanium alloy part |
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| EP1725358B1 (en) * | 2004-03-12 | 2019-07-10 | Sandvik Intellectual Property AB | Cutting tool and method for cutting material |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102581362A (en) * | 2012-03-22 | 2012-07-18 | 沈阳飞机工业（集团）有限公司 | Method for processing part with thin wall and changed-angle curved surface appearance |
| CN104227103A (en) * | 2014-07-24 | 2014-12-24 | 西安航空学院 | Method for stepped symmetrical milling of thin-wall part |
| CN104741877A (en) * | 2015-04-02 | 2015-07-01 | 中航飞机股份有限公司西安飞机分公司 | Numerical control machining method for U-shaped cavity thin wall edge strip type titanium alloy part |
Non-Patent Citations (1)
| Title |
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| 薄壁高缘条高效稳定切削技术研究;龚清洪等;《制造技术与机床》;20181002(第10期);20-24页 * |
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