CN108655666B - Slot antenna radiation plate and processing method thereof - Google Patents
Slot antenna radiation plate and processing method thereof Download PDFInfo
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- CN108655666B CN108655666B CN201810266855.7A CN201810266855A CN108655666B CN 108655666 B CN108655666 B CN 108655666B CN 201810266855 A CN201810266855 A CN 201810266855A CN 108655666 B CN108655666 B CN 108655666B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
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Abstract
The invention discloses a slot antenna radiation plate and a processing method thereof, wherein the method comprises the following steps: selecting the size of a blank according to the preset size of the slot antenna radiation plate; blanking the blank according to the size of the blank to obtain the blank; carrying out primary high-temperature annealing treatment on the blank, wherein the annealing temperature is 450-560 ℃, and the annealing time is 6-10 h; clamping the blank by using a clamp; and (4) processing the blank clamped by the clamp at a high speed to obtain the slot antenna radiation plate with the coupling seam. According to the method, the blank stress can be well eliminated only by one-time high-temperature annealing treatment, the slot antenna radiation plate with good mechanical property and uniform structure is obtained, the problems that the existing slot antenna radiation plate processed by multiple annealing treatments is long in processing period, parts cannot be controlled to deform and the like are solved, and the qualified rate of slot antenna parts is improved.
Description
Technical Field
The invention relates to the field of machining, in particular to a slot antenna radiation plate and a machining method thereof.
Background
A slot antenna, also called a slot antenna, refers to an antenna formed by slotting on a conductor plane, and is generally used in equipment such as radar, navigation, electronic countermeasure, communication and the like in a microwave band; the aluminum alloy has low density and good plasticity, can be processed into various sections, has excellent electrical conductivity, thermal conductivity and corrosion resistance, is a non-ferrous metal structural material which is most widely applied in industry, and is widely applied to aviation, aerospace, automobiles, mechanical manufacturing, ships and chemical industry. The combination of the two, namely the aluminum alloy slot antenna, becomes an important part in the fields of aviation and aerospace, the more complex the shape is, the higher the requirements on dimensional accuracy and smoothness are, the thinner the wall is, and the higher and more comprehensive requirements on machining are provided. In the processing process of the aluminum alloy slot antenna before brazing, due to the influence of factors such as milling force, milling heat, residual stress, clamping force and the like, the influence on the processing precision and surface finish of parts is large, the parts are easily scrapped, and particularly, whether the slot antenna part is qualified or not is directly determined by the quality of the slot antenna radiation plate. At present, internal stress of a slot antenna plate is eliminated mainly by means of multiple annealing treatment, and raw material milling performance is improved, but multiple annealing treatment can lead to long processing period of the slot antenna radiation plate, residual stress in a blank cannot be eliminated due to too low heating temperature and too short heating time, and the qualification rate of slot antenna parts is reduced.
Disclosure of Invention
The invention provides a slot antenna radiation plate and a processing method thereof, which aim to solve or partially solve the problems.
According to an aspect of the present invention, there is provided a method for processing a slot antenna radiation plate, the method including:
selecting the size of a blank according to the preset size of the slot antenna radiation plate;
blanking the blank according to the size of the blank to obtain the blank;
carrying out primary high-temperature annealing treatment on the blank, wherein the annealing temperature is 450-560 ℃, and the annealing time is 6-10 h;
clamping the blank by using a clamp;
and processing the blank clamped by the clamp at a high speed to obtain the slot antenna radiation plate with the coupling seam.
Optionally, assuming that the preset sizes of the slot antenna radiation plate are a2, b2 and c2, and the blank size is a1, b1 and c1, the a1 is 10-20mm larger than a2, the b1 is 10-20mm larger than b2, and the c1 is 1-2mm larger than c 2.
Optionally, the annealing temperature is 500 ℃ and the annealing time is 8 h.
Optionally, the clamp is a vacuum suction clamp.
Optionally, the high-speed machining adopts high-speed milling, and the machining parameters selected by the high-speed milling are as follows: the rotation speed of a machine tool spindle is above 40000rpm, the rotation speed n of a cutter is 30000r/min, the feed amount f is 3000mm/min, the cutting depth ap is 0.2mm, and the cutting width ae is 4 mm.
Optionally, the slot antenna radiation plate is manufactured by using the processing method of the slot antenna radiation plate.
Optionally, the flatness of the slot antenna radiation plate is not greater than 0.1 mm.
Optionally, the slot antenna radiation plate is made of an aluminum alloy.
The embodiment of the invention has the beneficial effects that: according to the processing method of the slot antenna radiation plate, the annealing temperature of 450-560 ℃ and the annealing time of 6-10 hours are adopted, the stress of the blank can be well eliminated only by carrying out high-temperature annealing treatment once, the proper size of the blank is selected, the situation that the deformed part of the periphery of the blank is fully milled after the high-temperature annealing treatment is carried out can be ensured, material waste is avoided, the blank is smoother, the slot antenna radiation plate with good mechanical property and uniform structure is finally obtained, the problems that the processing period of the processed slot antenna radiation plate is long due to multiple annealing treatments, the residual stress in the blank cannot be eliminated due to too low heating temperature and too short heating time in the prior art are solved, and the qualified rate of slot antenna parts is improved.
Drawings
Fig. 1 is a flowchart of a method for processing a slot antenna radiation plate according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the distribution of coupling slots on the radiating plate of the slot antenna.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for processing a slot antenna radiation plate according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
step S11: selecting the size of a blank according to the preset size of the slot antenna radiation plate;
step S12: blanking the blank according to the size of the blank to obtain the blank;
step S13: carrying out primary high-temperature annealing treatment on the blank, wherein the annealing temperature is 450-560 ℃, and the annealing time is 6-10 h;
step S14: clamping the blank by using a clamp;
step S15: and processing the blank clamped by the clamp at a high speed to obtain the slot antenna radiation plate with the coupling seam.
In one embodiment of the invention, the blank has the size of a1, b1 and c1, the preset size of the slot antenna radiation plate has the length of a2, the width of b2 and the thickness of c2, the a1 is 10-20mm larger than a2, the b1 is 10-20mm larger than b2, and the c1 is 1-2mm larger than c 2. Preferably, a1 is 580mm, b1 is 540mm, c1 is 2 mm; a2 of 560mm, b2 of 520mm and c2 of 1 mm.
Regarding the selection of the size of the blank, if the size of the blank is too large, the blank is not easy to clamp, the time of high-speed milling is increased, and raw materials are wasted. In this embodiment, the preset size of the slot antenna radiation plate is 560mm × 520mm × 1 mm. Preferably, the blank size is 580mm × 540mm × 2mm, compared with the blank size 565mm × 525mm × 2mm which is often selected in the prior art, a small amount of deformation of the part edge generated in the machining process can be transferred to the added blank, and finally, the deformed outer edge is cut off through machining, so that the deformed slot antenna radiation plate is left, and the flatness of the slot antenna radiation plate meets the design requirement.
Selecting the size of a blank according to the preset size 560mm multiplied by 520mm multiplied by 1mm of the slot antenna radiation plate, blanking the blank to obtain the blank with the size of 580mm multiplied by 540mm multiplied by 2mm, changing the annealing temperature and the annealing time used by high-temperature annealing treatment, researching the influence of the annealing temperature and the annealing time on the flatness of the blank, and selecting the optimal annealing temperature and the optimal annealing time.
The flatness is the deviation of the macro concave-convex height of the substrate relative to the ideal plane, namely the flatness error value, and is the flatness error value represented by the line value through comparing the measured actual surface with the ideal plane and measuring the line value distance between the measured actual surface and the ideal plane or through measuring the relative height difference of a plurality of points on the actual surface and then converting the relative height difference. It can be seen that the smaller the flatness value, the closer the measured actual surface is to the ideal plane, and the flatter the surface. Generally, the flatness requirement of the slot antenna radiation plate is not more than 0.1 mm.
TABLE 1 Effect of annealing temperature and annealing time on the flatness of a slot antenna radiating plate
Table 1 shows flatness data of the slot antenna radiation plate corresponding to different annealing temperatures and annealing times, and it can be seen from table 1 that the flatness of the slot antenna radiation plate produced by using the annealing temperatures and the annealing times in the prior art is 0.2mm and greater than 0.1mm, which does not meet the flatness requirement, in this case, in the prior art, the stress is usually eliminated by performing multiple annealing treatments on a blank, but the multiple annealing treatments can prolong the processing cycle of parts, and the residual stress in the raw material cannot be completely eliminated.
According to the scheme, when the annealing temperatures are 450 ℃, 500 ℃ and 560 ℃ respectively, and the corresponding annealing times are 10h, 8h and 6h respectively, the flatness of the produced slot antenna radiation plate is 0.09mm, 0.08mm and 0.095mm respectively, namely the flatness of the obtained slot antenna radiation plate is not more than 0.1mm, and the requirement of the slot antenna radiation plate on the flatness is met. Therefore, the technical scheme of the invention can meet the requirement of the slot antenna radiation plate on the flatness only by carrying out high-temperature annealing treatment once. The flatness of the slot antenna radiation plate is the minimum when the annealing temperature is 500 ℃ and the annealing time is 8h, which means that the obtained slot antenna radiation plate is the most flat when the annealing temperature is 500 ℃ and the annealing time is 8 h.
In a preferred embodiment of the present invention, the jig is a vacuum suction jig.
The aluminum alloy is easy to deform, especially thin-wall aluminum alloy which is thinner and thinner is easier to deform in the processing process, the mode that the periphery of the part is pressed by the pressing plate is mainly adopted when the existing thin-wall aluminum alloy part is milled, if the clamping mode is adopted when the thin-wall aluminum alloy slot antenna radiation plate is processed, the clamping is difficult and the efficiency is low, and the deformation caused by unbalanced stress and rigidity change of a blank in the milling process can not be controlled, so that the processed radiation plate is easy to scrap. The vacuum adsorption clamp compresses the blank by atmospheric pressure and adsorbs the positioning by the negative pressure to the blank, so the deformation problem of the blank in the milling process can be well solved by the vacuum adsorption clamp, the clamping efficiency is high, and the processing quality is better.
In another preferred embodiment of the present invention, the high speed machining is a high speed milling. The processing parameters selected for high-speed milling are as follows: the rotation speed of a machine tool spindle is greater than 40000rpm, the rotation speed n of a cutter is 30000r/min, the feed rate f is 3000mm/min, the cutting depth ap is 0.2mm, and the cutting width ae is 4 mm.
High-speed milling adopts the processing mode of "little depth of cut, fast feed", and 95% milling heat can be taken away by smear metal and coolant liquid, and like this, the work piece surface keeps room temperature basically, and moreover, the milling force and the milling power that high-speed processing produced are all very little, and the cutter can not cause the extrusion to the work piece like this to the work piece deformation has been reduced. The machine tool spindle in the embodiment has a rotation speed of 40000rpm or more, a tool rotation speed n of 30000r/min, a feed amount f of 3000mm/min, a cutting depth ap of 0.2mm, and a cutting width ae of 4mm, so that the surface of the processed slot antenna radiation plate has no deteriorated layer and microcrack, and the slot antenna radiation plate has small thermal deformation, small roughness and good surface quality.
In this embodiment, for a slot antenna radiation plate with a preset size of 560mm × 520mm × 1mm, 94 coupling slots are formed on the slot antenna radiation plate, and the size of the coupling slots is 7.4mm × 2mm, as shown in fig. 2, and fig. 2 is a schematic distribution diagram of the coupling slots on the slot antenna radiation plate.
The embodiment of the invention also provides a slot antenna radiation plate, which is manufactured by adopting the processing method of the slot antenna radiation plate shown in the figure 1. Through tests, the flatness of the slot antenna radiation plate manufactured by the processing method of the slot antenna radiation plate shown in fig. 1 is less than 0.1mm, and completely meets the requirement of the slot antenna radiation plate on the flatness.
In one embodiment of the present invention, preferably, the material of the slot antenna radiation plate is an aluminum alloy.
In summary, the blank size is selected according to the preset size of the slot antenna radiation plate; blanking the blank according to a preset size to obtain a blank; carrying out primary high-temperature annealing treatment on the blank, wherein the annealing temperature is 450-560 ℃, and the annealing time is 6-10 h; clamping the blank by using a vacuum adsorption clamp; and (4) processing the blank clamped by the vacuum adsorption clamp at a high speed to obtain the slot antenna radiation plate with the coupling seam. The processing method adopts proper annealing temperature and annealing time, can well eliminate the stress of the blank only by carrying out high-temperature annealing treatment once, selects proper blank size, can ensure that the deformed part of the periphery of the blank after the high-temperature annealing treatment is fully milled, so that the blank is smoother, and finally the slot antenna radiation plate with good mechanical property and uniform structure is obtained, thereby solving the problems that the existing slot antenna radiation plate processed by multiple annealing treatments has long processing period, and the residual stress in the blank can not be eliminated by too low heating temperature and too short heating time, and improving the qualification rate of slot antenna parts; the vacuum adsorption fixture is selected, so that the deformation problem of the blank in the milling process can be well solved, the clamping efficiency is high, and the processing quality is good; by adopting high-speed milling processing, the processed surface of the slot antenna radiation plate has no altered layer and microcrack, and has small thermal deformation, small roughness and good surface quality.
While the foregoing is directed to embodiments of the present invention, other modifications and variations of the present invention may be devised by those skilled in the art in light of the above teachings. It should be understood by those skilled in the art that the foregoing detailed description is for the purpose of illustrating the invention rather than the foregoing detailed description, and that the scope of the invention is defined by the claims.
Claims (3)
1. A method for processing a slot antenna radiation plate is characterized by comprising the following steps:
selecting the size of a blank according to the preset size of the slot antenna radiation plate;
blanking the blank according to the size of the blank to obtain the blank;
carrying out high-temperature annealing treatment on the blank for only one time, wherein the annealing temperature is 450-560 ℃, and the annealing time is 6-10 h;
clamping the blank by using a clamp;
processing the blank clamped by the clamp at a high speed to obtain a slot antenna radiation plate with a coupling seam;
the selecting the blank size according to the preset size of the slot antenna radiation plate comprises the following steps:
assuming that the preset sizes of the slot antenna radiation plate are a2, b2 and c2, the blank size is a1, b1 and c1, the a1 is 10-20mm larger than a2, the b1 is 10-20mm larger than b2, and the c1 is 1-2mm larger than c 2;
the high-speed machining adopts high-speed milling, and the machining parameters selected by the high-speed milling are as follows: the rotation speed of a machine tool main shaft is greater than 40000rpm, the rotation speed of a tool n =30000r/min, the feed rate f =3000mm/min, the cutting depth ap =0.2mm, and the cutting width ae =4 mm.
2. The method of claim 1, wherein the annealing temperature is 500 ℃ and the annealing time is 8 hours.
3. The method of claim 1, wherein the chuck is a vacuum chuck.
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| CN201810266855.7A CN108655666B (en) | 2018-03-28 | 2018-03-28 | Slot antenna radiation plate and processing method thereof |
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| CN108655666B true CN108655666B (en) | 2020-09-29 |
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| US9161478B2 (en) * | 2012-02-24 | 2015-10-13 | Futurewei Technologies, Inc. | Apparatus and method for an active antenna heat sink |
| CN102891376A (en) * | 2012-10-24 | 2013-01-23 | 四川九洲空管科技有限责任公司 | Millimeter wave circularly polarized planar slot array antenna |
| CN103331471B (en) * | 2013-06-20 | 2015-08-19 | 上海无线电设备研究所 | A kind of method manufacturing millimeter wave antenna gap array thin plate |
| CN105563018A (en) * | 2015-11-11 | 2016-05-11 | 陕西一品达石化有限公司 | Machining method of DCMP aluminium alloy vacuum soldering machine case |
| CN105397423B (en) * | 2015-12-09 | 2017-06-20 | 北京航星机器制造有限公司 | The manufacture method of the large thin-wall covering with interior muscle and complex-shaped surface mould |
| CN106112403A (en) * | 2016-08-01 | 2016-11-16 | 合肥佳瑞林电子技术有限公司 | A kind of processing technique of radar aperture plate antenna |
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