CN111730114A - Milling method for aluminum alloy thin-wall web structural member - Google Patents
Milling method for aluminum alloy thin-wall web structural member Download PDFInfo
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- CN111730114A CN111730114A CN202010463302.8A CN202010463302A CN111730114A CN 111730114 A CN111730114 A CN 111730114A CN 202010463302 A CN202010463302 A CN 202010463302A CN 111730114 A CN111730114 A CN 111730114A
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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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
Abstract
The invention relates to a milling method of an aluminum alloy thin-wall web structural member, which comprises the steps of carrying out circulating heat treatment on an aluminum alloy plate blank for three times; roughly processing the front and back surfaces of the blank by adopting a three-edge integral milling cutter with the diameter of 4 mm; performing semi-finish machining on the workpiece by adopting a four-edge integral milling cutter with the diameter of 3 mm; carrying out three times of circulating heat treatment on the semi-finished blank; removing the deformation of the reference surface generated by residual stress release by adopting a four-edge integral milling cutter with the diameter of 3 mm; the structure was machined to target dimensions using a four-edged solid end mill with a diameter of 3 mm. According to the invention, through two times of circulating heat treatment, the residual stress in the workpiece is released, and the workpiece is prevented from being deformed due to overheating in the milling process; the three-edge integral end mill with the diameter of 4 mm and the four-edge integral end mill with the diameter of 3 mm are adopted to carry out semi-finish machining and finish machining on the workpiece, so that the cutter can be ensured to have high rigidity in the process of removing a large amount of materials, the discharge of chips is facilitated, and the cutting load of each tooth can be reduced.
Description
Technical Field
The invention relates to the field of machining, in particular to a milling method for an aluminum alloy thin-wall web structural member.
Background
The aluminum alloy thin-wall structural member has the advantages of light weight, corrosion resistance and the like, can effectively reduce the dead weight of the aircraft, improves the maneuverability and carrying load capacity, and is widely applied to the field of aviation manufacturing.
The aluminum alloy thin-wall structural member has low rigidity and large machining allowance, and the machining precision, particularly the shape and position precision, is difficult to control, thereby directly influencing the working reliability and the service life of the product. In order to reduce or inhibit part deformation, the existing method mainly carries out multiple times of cutting by reducing cutting amount and combines manual correction or technological compensation, and the method is complex in process and low in machining efficiency.
Disclosure of Invention
In order to solve the technical problem, the invention provides a milling method for an aluminum alloy thin-wall web structural member. The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a milling method for an aluminum alloy thin-wall web structural member comprises the following steps: the first step is as follows: carrying out circulating heat treatment on the aluminum alloy plate blank for three times;
the second step is that: positioning and clamping an aluminum alloy plate blank, and roughly processing the front and back surfaces of the blank by adopting a three-edge integral end mill with the diameter of 4 mm;
the third step: performing semi-finishing on the workpiece by adopting a four-edge integral end mill with the diameter of 3 mm, and removing the surface residual height and the surface residual stress layer generated in the second step of machining;
the fourth step: carrying out three times of circulating heat treatment on the semi-finished blank to reduce residual stress introduced into the workpiece by clamping, rough machining and semi-finishing;
the fifth step: removing the deformation of the reference surface generated by the residual stress release in the fourth step of the cyclic heat treatment process by adopting a four-edge integral end mill with the diameter of 3 mm;
and a sixth step: and (3) machining the aluminum alloy thin-wall web structural member to a target size by adopting a four-edge integral end mill with the diameter of 3 mm.
The cyclic heat treatment comprises the following steps:
the first step is as follows: cooling the workpiece in a low-temperature box at the temperature of minus 40 ℃ to minus 50 ℃, and keeping for 2 to 3 hours;
the second step is that: taking out the workpiece, and returning to room temperature;
the third step: and (3) placing the workpiece in the room temperature state into an artificial aging furnace, heating to 90-100 ℃, keeping for 2-3 hours, and cooling to room temperature after heat preservation is finished.
The wall thickness of the aluminum alloy thin-wall web structural part is 1 mm to 3 mm.
And both the semi-finishing and the finishing are formed by one-time feed machining.
The semi-finishing and the finishing are high-speed milling, and the rotation speed of a main shaft is 10000-12000 r/min.
The invention has the beneficial effects that: according to the invention, through two times of circulating heat treatment, the residual stress in the workpiece is released, and the workpiece is prevented from being overheated and deformed in the milling process to influence the final processing precision; the invention adopts the three-edge integral end mill with the diameter of 4 mm and the four-edge integral end mill with the diameter of 3 mm to carry out semi-finish machining and finish machining on the workpiece, can ensure that the cutter has high rigidity in the process of removing a large amount of materials, is beneficial to discharging chips and can reduce the cutting load of each tooth, and simultaneously, the semi-finish machining and the finish machining are formed at one time without manual shape correction or technological compensation.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic diagram of a milling process according to the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be described more clearly and more completely with reference to the drawings in the following embodiments, and it is understood that the described embodiments are only a part of the present invention, rather than all of the present invention, and based on the embodiments, other embodiments obtained by those skilled in the art without inventive exercise are within the protection scope of the present invention.
As shown in fig. 1, a milling method for an aluminum alloy thin-wall web structural member includes the following steps: the first step is as follows: performing circulating heat treatment on the aluminum alloy plate blank, circulating for three times to refine crystal grains on the surface of the blank, improving the machinability of the material, and simultaneously having the functions of reducing initial residual stress and stabilizing the structural size of the blank;
the second step is that: positioning and clamping an aluminum alloy plate blank, and roughly processing the front and back surfaces of the blank by adopting a three-edge integral end mill with the diameter of 4 mm; milling from the front surface and the back surface to offset blank deformation caused by residual stress release; the adoption of the three-edge integral end mill with the diameter of 4 mm can ensure that the cutter has high rigidity in the process of removing a large amount of materials and is beneficial to the discharge of chips;
the third step: performing semi-finishing on the workpiece by adopting a four-edge integral end mill with the diameter of 3 mm, and removing the surface residual height and the surface residual stress layer generated in the second step of machining;
the fourth step: carrying out three times of circulating heat treatment on the semi-finished blank to reduce residual stress introduced into the workpiece by clamping, rough machining and semi-finishing; a large amount of mechanical and thermal loads are generated in the rough machining process, so that the microstructure of the workpiece is obviously changed, and a heat treatment mode consistent with that before the first step is adopted for keeping the mechanical properties of the workpiece after rough machining and semi-finish machining and the workpiece after the rough machining and semi-finish machining;
the fifth step: removing the deformation of the reference surface generated by the residual stress release in the fourth step of the cyclic heat treatment process by adopting a four-edge integral end mill with the diameter of 3 mm; the cutting load of each tooth can be reduced by adopting a four-edge integral end mill with the diameter of 3 mm;
and a sixth step: and (3) machining the aluminum alloy thin-wall web structural member to a target size by adopting a four-edge integral end mill with the diameter of 3 mm.
The cyclic heat treatment comprises the following steps:
the first step is as follows: cooling the workpiece in a low-temperature box at the temperature of minus 40 ℃ to minus 50 ℃, and keeping for 2 to 3 hours;
the second step is that: taking out the workpiece, and returning to room temperature;
the third step: and (3) placing the workpiece in the room temperature state into an artificial aging furnace, heating to 90-100 ℃, keeping for 2-3 hours, and cooling to room temperature after heat preservation is finished.
The wall thickness of the aluminum alloy thin-wall web structural part is 1 mm to 3 mm.
The semi-finishing and the finishing are both formed by one-time feed machining; the method can avoid the drum-shaped instability of the central part of the aluminum alloy thin-wall web structural member caused by introducing excessive thermal load due to multiple times of feed processing, and does not need manual shape correction or technological compensation.
The semi-finishing and the finishing are carried out by high-speed milling, and the rotating speed of a main shaft is 10000-12000 r/min; the rotating speed of the main shaft can be selected according to the thickness degree of the workpiece, and the rotating speed of the main shaft is preferably 12000 rpm according to the wall thickness of the aluminum alloy thin-wall web structural part of 1-3 mm; by adopting a high-speed cutting processing mode, the cutting force can be reduced, and meanwhile, most of cutting heat is quickly taken away by cutting chips, so that the deformation of the aluminum alloy thin-wall web structural member caused by the action of the cutting force and the cutting heat load is avoided.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A milling method for an aluminum alloy thin-wall web structural member is characterized by comprising the following steps: the method comprises the following steps: the first step is as follows: carrying out circulating heat treatment on the aluminum alloy plate blank for three times;
the second step is that: positioning and clamping an aluminum alloy plate blank, and roughly processing the front and back surfaces of the blank by adopting a three-edge integral end mill with the diameter of 4 mm;
the third step: performing semi-finishing on the workpiece by adopting a four-edge integral end mill with the diameter of 3 mm, and removing the surface residual height and the surface residual stress layer generated in the second step of machining;
the fourth step: carrying out three times of circulating heat treatment on the semi-finished blank to reduce residual stress introduced into the workpiece by clamping, rough machining and semi-finishing;
the fifth step: removing the deformation of the reference surface generated by the residual stress release in the fourth step of the cyclic heat treatment process by adopting a four-edge integral end mill with the diameter of 3 mm;
and a sixth step: and (3) machining the aluminum alloy thin-wall web structural member to a target size by adopting a four-edge integral end mill with the diameter of 3 mm.
2. The milling method for the structural member of the aluminum alloy thin-wall web as claimed in claim 1, wherein the milling method comprises the following steps: the cyclic heat treatment comprises the following steps:
the first step is as follows: cooling the workpiece in a low-temperature box at the temperature of minus 40 ℃ to minus 50 ℃, and keeping for 2 to 3 hours;
the second step is that: taking out the workpiece, and returning to room temperature;
the third step: and (3) placing the workpiece in the room temperature state into an artificial aging furnace, heating to 90-100 ℃, keeping for 2-3 hours, and cooling to room temperature after heat preservation is finished.
3. The milling method for the structural member of the aluminum alloy thin-wall web as claimed in claim 1, wherein the milling method comprises the following steps: the wall thickness of the aluminum alloy thin-wall web structural part is 1 mm to 3 mm.
4. The milling method for the structural member of the aluminum alloy thin-wall web as claimed in claim 1, wherein the milling method comprises the following steps: and both the semi-finishing and the finishing are formed by one-time feed machining.
5. The milling method for the structural member of the aluminum alloy thin-wall web as claimed in claim 1, wherein the milling method comprises the following steps: the semi-finishing and the finishing are high-speed milling, and the rotation speed of a main shaft is 10000-12000 r/min.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112893942A (en) * | 2021-01-22 | 2021-06-04 | 辽宁工业大学 | Precise micro-milling method for high-volume silicon carbide particle reinforced aluminum matrix composite |
| CN113088649A (en) * | 2021-03-30 | 2021-07-09 | 贵州航天电子科技有限公司 | Heat treatment method for bracket and bracket processing technology using heat treatment method |
| CN113799193A (en) * | 2021-09-13 | 2021-12-17 | 富钰精密组件（昆山）有限公司 | Processing method of carbon fiber plate |
| CN113814678A (en) * | 2021-11-24 | 2021-12-21 | 四川明日宇航工业有限责任公司 | Integral machining process for stainless steel box type structural part |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112893942A (en) * | 2021-01-22 | 2021-06-04 | 辽宁工业大学 | Precise micro-milling method for high-volume silicon carbide particle reinforced aluminum matrix composite |
| CN112893942B (en) * | 2021-01-22 | 2024-03-22 | 辽宁工业大学 | Precise micro milling method for high-volume-fraction silicon carbide particle reinforced aluminum matrix composite material |
| CN113088649A (en) * | 2021-03-30 | 2021-07-09 | 贵州航天电子科技有限公司 | Heat treatment method for bracket and bracket processing technology using heat treatment method |
| CN113799193A (en) * | 2021-09-13 | 2021-12-17 | 富钰精密组件（昆山）有限公司 | Processing method of carbon fiber plate |
| CN113814678A (en) * | 2021-11-24 | 2021-12-21 | 四川明日宇航工业有限责任公司 | Integral machining process for stainless steel box type structural part |
| CN113814678B (en) * | 2021-11-24 | 2022-03-15 | 四川明日宇航工业有限责任公司 | Integral machining process for stainless steel box type structural part |
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| CN111730114B (en) | 2023-01-17 |
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Effective date of registration: 20230412 Address after: 241000 Yuan Road, Wuhu Economic and Technological Development Zone, Anhui Province Patentee after: Anhui Tianhang Mechanical and Electrical Co.,Ltd. Address before: 241000 Wanli Airport, Wuhu City, Anhui Province Patentee before: WUHU STATE-OWNED FACTORY OF MACHINING Patentee before: Anhui Tianhang Mechanical and Electrical Co.,Ltd. |