CN115877324A - Millimeter wave radar shell with wave transmitting and absorbing functions and preparation method thereof - Google Patents
Millimeter wave radar shell with wave transmitting and absorbing functions and preparation method thereof Download PDFInfo
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- CN115877324A CN115877324A CN202211466704.9A CN202211466704A CN115877324A CN 115877324 A CN115877324 A CN 115877324A CN 202211466704 A CN202211466704 A CN 202211466704A CN 115877324 A CN115877324 A CN 115877324A
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Abstract
The invention provides a millimeter wave radar shell with wave transmitting and absorbing functions and a preparation method thereof, relating to the field of functional polymer materials; the front cover has wave-transmitting and light-transmitting functions, and the rear cover has wave-absorbing and light-absorbing functions; the front cover ensures normal emission and reception of signals, and the rear cover absorbs lobe waves and reflected waves of the radar installation surrounding environment to the signals, so that normal wave beams are not interfered by clutter; and the front cover and the rear cover of the radar shell are connected together in a laser welding mode, the traditional screw and sealing rubber strip mode is replaced, and the radar shell joint is guaranteed to have good air tightness and reliability.
Description
Technical Field
The invention relates to the technical field of functional polymer materials, in particular to a millimeter wave radar shell with wave transmitting and absorbing functions and a preparation method thereof.
Background
The provisional regulations for automotive radar radio management, issued by the Ministry of industry and belief in 2021, state that the 76-79GHz band is used for automotive radar planning. Compared with a 24GHz radar, the 77GHz radar is smaller in size and better in detection precision, and the requirements on the radar shell front cover material tend to be lower in dielectric, low in loss and light in weight.
Millimeter-wave radars are radars operating in the millimeter-wave band, typically in the 30-300 GHz band. Millimeter wave radar is installed at bumper or panel beating position as an important spare part of senior driving assistance system usually, is in the vibration state for a long time at the in-process of traveling, if the fastness of connection is not enough, takes place very easily around the casing between the lid not hard up or fracture, rainwater, dust will enter into radar shell inside and harm components and parts, seriously influence the vehicle safety of traveling, therefore reliability and the gas tightness of millimeter wave radar shell seam are a very important index. Patent CN201820297732.5 discloses a radar housing, in which an upper housing and a lower housing are fixedly connected through a fastening mechanism and liquid glue; patent CN201821631672.2 discloses a waterproof and breathable shell for a laser radar, wherein the shells are connected through bolts.
The rear cover of the traditional millimeter wave radar shell generally adopts conventional glass fiber reinforced resin or metal shell, and the two shells have certain reflection effect on the lobe waves of electromagnetic wave signals; in addition, the distribution of the high-frequency millimeter wave electromagnetic field is more complex, in the actual application scene of the vehicle-mounted millimeter wave radar in loading, the radar signal can be interfered by the reflection of surrounding devices and automobile bumpers on the radar signal, obvious signal distortion can be seen in an automobile radar imaging system, the false alarm rate and the missing report rate are obviously increased, the accuracy of the radar work is seriously influenced, and great potential safety hazards are caused. The traditional radar shell is fixed on a mounting surface in a screw or buckle mode, and the mounting mode has many defects, such as easy loosening, falling, poor sealing performance and the like, and cannot well protect a radar device. Compared with screw connection, the mode of laser welding plastics has the advantages of reliable connection, good sealing property, convenient processing, water seepage resistance and the like, and can greatly ensure the transmission performance of millimeter waves.
In addition, the conventional rear cover of the millimeter wave radar shell generally adopts conventional glass fiber reinforced resin or metal shell, and the two shells have certain reflection effect on the lobe waves of electromagnetic wave signals; the distribution of a high-frequency millimeter wave electromagnetic field is more complex, radar signals of the vehicle-mounted millimeter wave radar can be interfered by reflection of surrounding devices and a vehicle bumper in an actual application scene, obvious signal distortion can be seen in an automobile radar imaging system, the false alarm rate and the missing report rate are obviously increased, the accuracy of radar work is seriously influenced, and great potential safety hazards are caused.
Disclosure of Invention
The invention aims to provide a millimeter wave radar shell with wave transmitting and absorbing functions and a preparation method thereof, wherein a front cover has the wave transmitting and light transmitting functions, a rear cover has the wave absorbing and light absorbing functions, the front cover ensures normal emission and reception of signals, and the rear cover ensures absorption of lobe waves and reflected waves of the surrounding environment of radar installation on the signals, so that normal beams are not interfered by clutter; the invention effectively ensures the accuracy of radar work and reduces the potential safety hazard of radar application.
In order to achieve the above purpose, the invention provides the following technical scheme: a millimeter wave radar shell with wave-transmitting and wave-absorbing functions is characterized in that a front cover is formed by a front cover material, and a rear cover is formed by a rear cover material; the front cover material comprises the following components in parts by weight: 30-80 parts of polybutylene terephthalate; 0-30 parts of polyethylene glycol terephthalate; 0-30 parts of polycarbonate; 15-40 parts of glass fiber; 3-8 parts of a toughening agent; 0-0.5 part of ester exchange inhibitor; 0.3-1 part of lubricant; 0.1-0.5 part of antioxidant; 0-0.5 part of organic toner compound system;
the rear cover material comprises the following components in parts by weight: 30-80 parts of polybutylene terephthalate; 0-30 parts of polyethylene glycol terephthalate; 0-30 parts of polycarbonate; 15-40 parts of glass fiber; 3-8 parts of a toughening agent; 10-30 parts of a wave absorbing agent; 0-0.5 part of ester exchange inhibitor; 0.3-1 part of lubricant; 0.1 to 0.5 portion of antioxidant.
Furthermore, in the front cover material and the rear cover material, polybutylene terephthalate is PBT with medium and low viscosity, polyethylene terephthalate is PET with medium and low viscosity, polycarbonate is PC with medium and low viscosity, and the melt flow rates of the polybutylene terephthalate, the polyethylene terephthalate and the polycarbonate are all 10-25 g/min.
Furthermore, the glass fiber in the front cover material and the rear cover material is alkali-free glass fiber yarn treated by a glass fiber silane type impregnating compound, and comprises one or more of chopped glass fiber, long glass fiber, flat glass fiber and low-dielectric glass fiber.
Further, the toughening agent in the front cover material and the rear cover material is one or more of a methyl methacrylate-butadiene-styrene terpolymer, an ethylene-methyl acrylate-glycidyl methacrylate terpolymer and an organic silicon-acrylate copolymer.
Further, the ester exchange inhibitor in the front cover material and the back cover material is alkyl phosphate.
Furthermore, the antioxidant in the front cover material and the rear cover material is one or more of hindered phenol antioxidant and phosphite antioxidant.
Further, the organic toner complexing system in the front cover material is obtained by compounding one or more of solvent red EG, solvent red E2G, solvent red G, solvent yellow 3G, solvent yellow G, solvent orange R, solvent violet 3R, solvent blue RR and solvent green 5B.
Furthermore, the wave absorbing agent in the rear cover material is one or more of metal micro powder, ferrite, carbon material, silicon carbide, aluminum borosilicate and barium titanate.
The invention discloses a preparation method of a millimeter wave radar shell with wave-transmitting and wave-absorbing functions, wherein a front cover and a rear cover of the millimeter wave radar shell are respectively formed by directly injecting a front cover material and a rear cover material, and the front cover and the rear cover are connected and fixed by laser welding;
wherein, the preparation process of the front cover material is as follows: adding a resin, a toughening agent, an antioxidant, a lubricant, an ester exchange inhibitor and an organic toner compound system into a high-speed mixer according to a proportion, uniformly mixing, adding from a main feeding port of a double-screw extruder, adding glass fiber from a side feeding port of the double-screw extruder, performing high-temperature melt extrusion, and then performing traction, cooling and granulation to obtain the glass fiber;
the preparation process of the rear cover material comprises the following steps: adding the resin, the toughening agent, the antioxidant, the lubricant and the ester exchange inhibitor into a high-speed mixer according to a proportion, uniformly mixing, and adding from a main feed of a double-screw extruder; after the wave absorbing agent is uniformly distributed in a high-speed mixer according to the proportion, the wave absorbing agent is added from a first side feeding port of a double-screw extruder after the surface treatment of a silane coupling agent is carried out; adding glass fiber from a second side feeding port of the double-screw extruder, performing high-temperature melt extrusion, and then performing traction, cooling and granulation to obtain the glass fiber.
Further, the front cover and the rear cover of the radar shell are welded by laser according to the following process parameters: the laser beam is 940nm near infrared beam, the laser scanning power is 50-90 w, and the laser scanning speed is 40-150 mm/s.
According to the technical scheme, the technical scheme of the invention has the following beneficial effects:
the invention discloses a millimeter wave radar shell with wave transmitting and absorbing functions and a preparation method thereof, wherein the shell comprises a front cover and a rear cover, wherein the front cover is formed by a front cover material; the front cover material and the rear cover material both comprise the following components in parts by weight: 30-80 parts of polybutylene terephthalate; 0-30 parts of polyethylene glycol terephthalate; 0-30 parts of polycarbonate; 15-40 parts of glass fiber; 3-8 parts of a toughening agent; 0-0.5 part of ester exchange inhibitor; 0.3-1 part of lubricant; 0.1-0.5 part of antioxidant; the front cover material also comprises 0-0.5 part of organic toner compound system, and the back cover material also comprises 10-30 parts of wave absorbing agent.
The front cover and the rear cover which are made of the front cover material and the rear cover material have the following advantages:
1) The front cover material of the millimeter wave radar shell disclosed by the invention is a wave-transparent and light-transmitting material, and can ensure normal emission and reception of radar signals; the rear cover material is a wave-absorbing and light-absorbing material and can absorb lobe waves and reflected waves of the surrounding environment for radar installation to signals.
2) The millimeter wave radar shell disclosed by the invention is suitable for an automobile radar, has wave transmitting and absorbing functions, not only ensures that the radar transmits forward and receives signals normally, but also absorbs peripheral clutter signals to avoid influencing normal signals, and solves the problems of drift, ghost and the like of the radar.
3) The millimeter wave radar shell disclosed by the invention adopts a laser welding mode to connect the front cover and the rear cover together, so that the good air tightness and reliability of the joint of the radar shell are fully ensured.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description in conjunction with the experimental data. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Similarly, the singular forms "a," "an," or "the" do not denote a limitation of quantity, but rather denote the presence of at least one, unless the context clearly dictates otherwise. The terms "comprises," "comprising," or the like, mean that the elements or items listed before "comprises" or "comprising" encompass the features, integers, steps, operations, elements, and/or components listed after "comprising" or "comprising," and do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Because the restriction of installation environment can lead to radar signal to receive the interference on the one hand of traditional millimeter wave radar casing in practical application, on the other hand further leads to radar signal's distortion because its fine reinforced resin of selection glass or metal material can reflect electromagnetic wave signal's lobe, causes the increase of false alarm rate and rate of missing reporting, influences the accuracy of radar work. The invention aims to solve the problems and provides a millimeter wave radar shell with wave transmitting and absorbing functions and a preparation method thereof, wherein the front cover has the wave transmitting and light transmitting functions, and the rear cover has the wave absorbing and light absorbing functions, so that the influence of radar shell materials and installation environment on radar signals is fully reduced, the working accuracy of a radar is improved, and the potential safety hazard of radar application is reduced.
The millimeter wave radar shell with wave-transmitting and wave-absorbing functions and the preparation method thereof of the present invention are further described in detail with reference to embodiments 1 to 4 for preparing the front cover and the rear cover of the millimeter wave radar shell. Wherein, table 1 is the formula of the front cover material and the rear cover material for preparing the radar shell, table 2 is the welding process of the radar shell, and table 3 is the test result of the radar shell material.
Table 1 shows the formula of the front cover material and the rear cover material of the radar shell
The process for preparing the front cover from the front cover material in the embodiments 1 to 4 is as follows: adding resin, a toughening agent, an antioxidant, a lubricant, an ester exchange inhibitor and toner into a high-speed mixer according to a certain proportion, uniformly mixing, adding from a main feeding port of a double-screw extruder, uniformly mixing glass fibers, adding from a side feeding port of the extruder, carrying out high-temperature melting extrusion, drawing, cooling and granulating to obtain a front cover material, and carrying out injection molding to obtain a front cover shell and a test sample plate of 100mm x 2mm. Wherein, the toner system adopts a black system which is obtained by compounding a solvent red E2G, a solvent yellow G and a solvent blue RR according to a weight ratio of 8.
The process for preparing the rear cover from the rear cover material in the embodiments 1 to 4 is as follows: adding resin, a toughening agent, an antioxidant, a lubricant and an ester exchange inhibitor into a high-speed mixer according to a certain proportion, uniformly mixing, adding from a main feed of a double-screw extruder, uniformly mixing a wave absorbing agent in the high-speed mixer according to a certain proportion, performing surface treatment by using a silane coupling agent, adding from a first side feed port of the extruder, uniformly mixing glass fibers, adding from a second side feed port of the extruder, performing high-temperature melt extrusion, traction, cooling and granulation to prepare a rear cover material, and performing injection molding to obtain a rear cover shell and a test sample plate of 100mm x 2mm.
In the embodiments 1 to 4, the front cover and the rear cover are fixed by the fixture, and then welded together by scanning the laser beam, and the specific welding process parameters are shown in the following table 2.
TABLE 2 welding Process of Radar housing
| Numbering | Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 |
| Laser power/W | 70 | 70 | 60 | 75 | 70 |
| Scanning speed/mm/s | 50 | 90 | 100 | 90 | 50 |
The test criteria and conditions for the products of the examples are as follows:
light transmittance of the wave-transmitting material: a laser transmittance tester for testing the thickness of 2mm;
wave-transmitting rate of wave-transmitting material: testing in an actual use scene, and receiving the ratio of power to transmitting power;
the electromagnetic wave reflectivity of the wave-absorbing material is as follows: referring to GJB 2038A-2011, the test frequency band is 76-81 GHz;
radar shell airtightness: and slowly pressurizing the interior of the welded radar shell finished product to 40kpa, observing whether the joint is air-leakage or not, judging that air-leakage exists and air-tightness is NG, and judging that air-leakage does not exist and air-tightness is OK.
Table 3 examples 1-4 product performance test results
In the embodiment, the low dielectric glass fiber can effectively improve the wave-transmitting performance of the material, and the flat glass fiber ensures the flatness of the front cover and the rear cover and ensures the normal emission of signals; the near infrared light transmittance of the PBT is improved by compounding PC or PET and the PBT; iron powder, carbon material and silicon carbide provide wave-absorbing properties. The front cover material and the rear cover material of the millimeter wave radar shell which are commercialized or published at present are generally made of the same material, and the rear cover material does not have a wave absorbing function and can suffer from signal interference and drift problems in an actual scene. The results of the performance tests on the products of the examples in table 3 above show that: the wave-transmitting performance of the front cover of the millimeter wave radar shell can reach more than 65%, and the near-infrared light transmittance can reach more than 20%; the reflectivity and the transmissivity of the rear cover of the millimeter wave radar shell are low, and the reflection of radar signals is reduced. In conclusion, the front cover and the rear cover of the millimeter wave radar shell disclosed by the invention have wave-transmitting and wave-absorbing functions respectively, so that forward emission and normal signal receiving are ensured, peripheral clutter signals are absorbed, and normal emission signals are prevented from being interfered by peripheral environments; in addition, the front cover material has light transmission, the rear cover material has light absorption, the front cover and the rear cover of the shell are connected together in a laser welding mode, welding airtightness is good, damage is not prone to occurring, and a series of problems caused by easiness in loosening, poor sealing performance and the like in an existing connecting mode are solved. The millimeter wave radar shell disclosed by the invention is suitable for automobile radars and can be widely applied to traffic radars for intelligent traffic.
In addition, the casing of the front cover of the common radar is natural color and black, and the front cover only lists the natural color and the black when the application is implemented, but is not limited to the natural color and the black. The present invention includes, but is not limited to, the above embodiments, and all improvements and modifications made in accordance with the teachings of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (10)
1. A millimeter wave radar shell with wave-transmitting and wave-absorbing functions comprises a front cover and a rear cover, and is characterized in that the front cover is formed by a front cover material, and the rear cover is formed by a rear cover material;
the front cover material comprises the following components in parts by weight: 30-80 parts of polybutylene terephthalate; 0-30 parts of polyethylene terephthalate; 0-30 parts of polycarbonate; 15-40 parts of glass fiber; 3-8 parts of a toughening agent; 0-0.5 part of ester exchange inhibitor; 0.3-1 part of lubricant; 0.1-0.5 part of antioxidant; 0-0.5 part of organic toner compound system;
the rear cover material comprises the following components in parts by weight: 30-80 parts of polybutylene terephthalate; 0-30 parts of polyethylene terephthalate; 0-30 parts of polycarbonate; 15-40 parts of glass fiber; 3-8 parts of a toughening agent; 10-30 parts of a wave absorbing agent; 0-0.5 part of ester exchange inhibitor; 0.3-1 part of lubricant; 0.1 to 0.5 portion of antioxidant.
2. The millimeter wave radar shell with the wave-transmitting and absorbing functions of claim 1, wherein polybutylene terephthalate in the front cover material and the rear cover material is PBT with medium and low viscosity, polyethylene terephthalate is PET with medium and low viscosity, and polycarbonate is PC with medium and low viscosity, and melt flow rates of the polybutylene terephthalate, the polyethylene terephthalate and the polycarbonate are all 10-25 g/min.
3. The millimeter wave radar housing with wave-transmitting and absorbing functions of claim 1, wherein the glass fibers in the front cover material and the rear cover material are alkali-free glass fiber yarns treated by a glass fiber silane type impregnating compound, and the glass fibers include one or more of chopped glass fibers, flat glass fibers and low dielectric glass fibers.
4. The millimeter wave radar housing with the wave-transmitting and absorbing function of claim 1, wherein the toughening agent in the front cover material and the rear cover material is one or more of a methyl methacrylate-butadiene-styrene terpolymer, an ethylene-methyl acrylate-glycidyl methacrylate terpolymer and an organosilicon-acrylate copolymer.
5. The millimeter wave radar housing with wave-transmitting and absorbing functions of claim 1, wherein the ester exchange inhibitor in the front cover material and the back cover material is alkyl phosphate.
6. The millimeter wave radar shell with the wave-transmitting and absorbing functions of claim 1, wherein the antioxidant in the front cover material and the rear cover material is one or more of hindered phenol antioxidants and phosphite antioxidants.
7. The millimeter wave radar shell with the wave-transmitting and wave-absorbing functions of claim 1, wherein the organic toner complexing system in the front cover material is obtained by compounding one or more of solvent red EG, solvent red E2G, solvent red G, solvent yellow 3G, solvent yellow G, solvent orange R, solvent violet 3R, solvent blue RR, and solvent green 5B.
8. The millimeter wave radar housing with wave-transmitting and wave-absorbing functions of claim 1, wherein the wave-absorbing agent in the back cover material is one or more of metal micropowder, ferrite, carbon material, silicon carbide, aluminum borosilicate, and barium titanate.
9. A preparation method of a millimeter wave radar shell with wave-transmitting and wave-absorbing functions is characterized in that a front cover and a rear cover of the millimeter wave radar shell are respectively formed by directly injecting a front cover material and a rear cover material, and the front cover and the rear cover are fixedly connected through laser welding;
wherein the preparation process of the front cover material comprises the following steps: adding a resin, a toughening agent, an antioxidant, a lubricant, an ester exchange inhibitor and an organic toner compound system into a high-speed mixer according to a proportion, uniformly mixing, adding from a main feeding port of a double-screw extruder, adding glass fiber from a side feeding port of the double-screw extruder, performing high-temperature melt extrusion, and then performing traction, cooling and granulation to obtain the glass fiber;
the preparation process of the rear cover material comprises the following steps: adding the resin, the toughening agent, the antioxidant, the lubricant and the ester exchange inhibitor into a high-speed mixer according to a proportion, uniformly mixing, and adding from a main feed of a double-screw extruder; after the wave absorbing agent is uniformly mixed in a high-speed mixer according to the proportion, the wave absorbing agent is added from a first side feeding port of a double-screw extruder after being subjected to surface treatment by a silane coupling agent; adding glass fiber from a second side feeding port of the double-screw extruder, performing high-temperature melt extrusion, and then performing traction, cooling and granulation to obtain the glass fiber.
10. The method for manufacturing a millimeter wave radar housing with wave transmitting and absorbing functions of claim 9, wherein the laser welding is performed on the front cover and the rear cover of the radar housing according to the following process parameters: the laser beam is 940nm near infrared beam, the laser scanning power is 50-90 w, and the laser scanning speed is 40-150 mm/s.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117126525A (en) * | 2023-09-21 | 2023-11-28 | 深圳市科源光科技有限公司 | Modified polycarbonate light-absorbing transparent plastic for laser welding and preparation method thereof |
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2022
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117126525A (en) * | 2023-09-21 | 2023-11-28 | 深圳市科源光科技有限公司 | Modified polycarbonate light-absorbing transparent plastic for laser welding and preparation method thereof |
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