CN111074181B - 5G antenna fixing seat and forming method thereof - Google Patents
5G antenna fixing seat and forming method thereof Download PDFInfo
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- CN111074181B CN111074181B CN201911365259.5A CN201911365259A CN111074181B CN 111074181 B CN111074181 B CN 111074181B CN 201911365259 A CN201911365259 A CN 201911365259A CN 111074181 B CN111074181 B CN 111074181B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/02—Alloys containing metallic or non-metallic fibres or filaments characterised by the matrix material
- C22C49/08—Iron group metals
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C47/00—Making alloys containing metallic or non-metallic fibres or filaments
- C22C47/14—Making alloys containing metallic or non-metallic fibres or filaments by powder metallurgy, i.e. by processing mixtures of metal powder and fibres or filaments
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/14—Alloys containing metallic or non-metallic fibres or filaments characterised by the fibres or filaments
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
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Abstract
The invention discloses a method for forming a 5G antenna fixing seat, which comprises the following steps of designing a forming die; by mass percentage, 0.4-1.5% of carbon powder, 1-4% of copper powder, 1-5% of nickel powder, 0.25-2% of molybdenum powder, 0.8-6% of chromium powder, 1-5% of manganese powder, 2-6% of carbon fiber and the balance of iron powder; mixing uniformly to obtain mixed powder; pressing to obtain a green body; sintering to obtain a sintered part; carbonitriding the sintered part, quenching, keeping the temperature, tempering at low temperature, keeping the temperature, and cooling to obtain a 5G antenna fixing seat; still disclose a 5G antenna fixing base. According to the invention, the traditional powder system is optimized by adding chromium powder, manganese powder, carbon fiber and the like, the matching of raw materials with different particle sizes and different proportion amounts is controlled, the bonding performance among the raw materials is enhanced to ensure that the raw materials are uniformly distributed, the phenomena of cracking, agglomeration and the like after pressing and sintering are avoided, and the product achieves good hardness, density, strength and wear resistance.
Description
Technical Field
The invention relates to the field of antenna fixing seat production, in particular to a 5G antenna fixing seat and a forming method thereof.
Background
At present, most of the traditional forming processes of the antenna fixing seat adopt a process of combining a lathe and CNC (computerized numerical control) equipment for processing and then carrying out surface treatment on a product, the processing precision of the process is low, the requirement on the operation technical level of an operator is high, the processing quality is easily influenced by the factors of the operator, the processing contour of the product is limited by a cutter, the internal structure of the product with a complex structure cannot be cut and formed, the processing efficiency is low, and the production cost is high. With the development of industrial technology, the antenna fixing seat with a complex structure is produced at the present stage by adopting a powder metallurgy processing and forming process, the process mainly adopts a C-Cu-Ni-Mo powder system, the system only adopts a metal material, the mechanical property and the friction coefficient are unstable, the production requirements of high strength, high density and wear resistance cannot be met, the metal material cannot be uniformly mixed only by adopting simple mechanical mixing, and the phenomena of cracking and the like easily occur in the sintering process due to the non-uniform distribution of the metal material, so that the comprehensive performance of the product is influenced. Therefore, how to optimize the process using the C-Cu-Ni-Mo powder system to achieve better density and strength has become a major research direction.
Disclosure of Invention
In order to overcome the technical problem, the invention discloses a method for forming a 5G antenna fixing seat; still disclose a 5G antenna fixing base.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a forming method of a 5G antenna fixing seat comprises the following steps:
step one, designing a forming die: designing and manufacturing a powder metallurgy die according to the shape and the internal structure required by the 5G antenna fixing seat, and mounting the powder metallurgy die on a powder metallurgy forming press for later use;
step two, raw material proportioning: by mass percentage, 0.4-1.5% of carbon powder, 1-4% of copper powder, 1-5% of nickel powder, 0.25-2% of molybdenum powder, 0.8-6% of chromium powder, 1-5% of manganese powder, 2-6% of carbon fiber and the balance of iron powder, wherein the particle size of the raw materials is as follows: 6-20 microns of carbon powder, 15-25 microns of copper powder, 10-20 microns of nickel powder, 10-20 microns of molybdenum powder, 10-20 microns of chromium powder, 10-20 microns of manganese powder and 20-50 microns of iron powder, and the diameter of the carbon fiber is 5-7 microns;
step three, mixing materials: uniformly mixing the raw materials according to the mass percentage of the second step to obtain mixed powder;
step four, green body forming: placing the mixed powder in the powder metallurgy die for pressing to obtain a green body;
step five, sintering: placing the green body in a mesh belt type sintering furnace for sintering according to set sintering process parameters to obtain a sintered piece, wherein the sintering temperature is 1050-1350 ℃, and the sintering time is 1-350 min;
step six, surface treatment: placing the sintered part in a mesh-belt type heat treatment furnace for carbonitriding, carrying out quenching and heat preservation for 1.5-2.5 h, then carrying out low-temperature tempering and heat preservation for 2h, and cooling to obtain a 5G antenna fixing seat; wherein the quenching temperature is 830-840 ℃, and the tempering temperature is 180 ℃.
The method for forming the 5G antenna fixing base, wherein before sintering the green body, the method further comprises: and carrying out pre-sintering treatment on the green body.
The forming method of the 5G antenna fixing seat is characterized in that the pre-sintering temperature is 250-600 ℃, and the pre-sintering time is 45-60 min.
In the fifth step, hydrogen and nitrogen mixed protective gas is adopted in the mesh belt type sintering furnace, and the volume percentage of hydrogen to nitrogen is 3-10: 90 to 97.
The above method for forming a 5G antenna fixing base, wherein before carbonitriding the sintered part, the method further comprises: and shaping and deburring the sintered part.
In the fourth step of the forming method of the 5G antenna fixing seat, the density of the green body is 7.2-7.25G/cm3。
In the above method for forming the 5G antenna fixing base, the pressing pressure is 150-160T.
In the sixth step, the density of the 5G antenna fixing seat is greater than 7.4G/cm3。
In the above molding method of the 5G antenna fixing base, in the first step, according to the accuracy requirement of the external profile of the 5G antenna fixing base, an external mold of the powder metallurgy mold is manufactured; and manufacturing the inner die of the powder metallurgy die according to the internal outline of the 5G antenna fixing seat and the precision requirement of the internal thread structure.
A5G antenna fixing seat is manufactured by adopting the forming method of the 5G antenna fixing seat.
The invention has the beneficial effects that: the invention adopts the powder of carbon, copper, nickel, molybdenum and the like as a matrix, optimizes the traditional powder system by adding the raw materials of chromium powder, manganese powder, carbon fiber and the like, controls the matching of the raw materials with different grain diameters and different proportion, enhances the bonding performance among the raw materials to ensure that the raw materials are uniformly distributed, avoids the phenomena of cracking, agglomeration and the like after pressing and sintering, ensures that the product achieves good hardness, density, strength and wear resistance, has high utilization rate of the raw materials, adopts the powder metallurgy die with high processing precision to ensure that the pressed product has high-precision external outline and internal structure, has high processing precision and efficiency and low preparation cost, and is suitable for industrial production.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to facilitate the understanding and appreciation of the technical solutions of the present invention, rather than to limit the invention thereto.
The invention provides a method for forming a 5G antenna fixing seat, which comprises the following steps:
step one, designing a forming die: designing and manufacturing a powder metallurgy die according to the shape and the internal structure required by the 5G antenna fixing seat, mounting the powder metallurgy die on a powder metallurgy forming press for standby, and pressing and forming a product by adopting the powder metallurgy die so as to solve the problem that the product with a complex structure is difficult to ensure high precision and strong performance;
step two, raw material proportioning: by mass percentage, 0.4-1.5% of carbon powder, 1-4% of copper powder, 1-5% of nickel powder, 0.25-2% of molybdenum powder, 0.8-6% of chromium powder, 1-5% of manganese powder, 2-6% of carbon fiber and the balance of iron powder, wherein the particle size of the raw materials is as follows: 6-20 microns of carbon powder, 15-25 microns of copper powder, 10-20 microns of nickel powder, 10-20 microns of molybdenum powder, 10-20 microns of chromium powder, 10-20 microns of manganese powder and 20-50 microns of iron powder, and the diameter of the carbon fiber is 5-7 microns; through the matching of the raw materials with different particle sizes and different proportion amounts, the bonding performance between the raw materials is enhanced, the phenomena of cracking or agglomeration and the like after pressing and sintering are avoided, so that the product achieves good hardness, density, strength and wear resistance, and the utilization rate of the raw materials is high;
step three, mixing materials: uniformly mixing the raw materials according to the mass percentage of the second step to obtain mixed powder, so that the phenomenon of segregation of the raw materials with different proportions in the material mixing process is effectively avoided;
step four, green body forming: placing the mixed powder into the powder metallurgy die for pressing to obtain a green body, wherein the pressing pressure is 150-160T, so that one-step forming of a product with a complex structure is realized, and higher density and strength are achieved;
step five, sintering: placing the green body in a mesh belt type sintering furnace for sintering according to set sintering process parameters to obtain a sintered piece, wherein the sintering temperature is 1050-1350 ℃, the sintering time is 1-350 min, and the product is sintered, molded and compact to meet the requirements of high strength, high hardness and wear resistance;
step six, surface treatment: placing the sintered part in a mesh-belt type heat treatment furnace for carbonitriding, carrying out quenching and heat preservation for 1.5-2.5 h, then carrying out low-temperature tempering and heat preservation for 2h, and cooling to obtain a 5G antenna fixing seat; wherein the quenching temperature is 830-840 ℃, and the tempering temperature is 180 ℃.
Preferably, before sintering the green body, the forming method further comprises: and pre-sintering the green body, wherein the pre-sintering temperature is 250-600 ℃, and the pre-sintering time is 45-60 min, so that the raw materials are activated and sintered in the pre-sintering process to form a structure with uniform density, and the comprehensive performance of the product is enhanced.
Further, in the fifth step, a mixed protective gas of hydrogen and nitrogen is adopted in the mesh-belt sintering furnace, and the volume percentage of the hydrogen to the nitrogen is 3-10: 90-97, the moderate volume percentage of hydrogen and nitrogen is controlled, the production cost is reduced, and the safety is ensured.
Preferably, before carbonitriding the sintered article, the forming method further includes: and (3) shaping and deburring the sintered part, strictly controlling the size precision of the product and the processing quality of a complex structure, and improving the yield of the product.
Preferably, in the fourth step, the density of the green body is 7.2-7.25 g/cm3(ii) a The density of the 5G antenna fixing seat is more than 7.4G/cm3The product has high precision and high density performance.
Preferably, in the step one, according to the precision requirement of the external profile of the 5G antenna fixing seat, an external mold of the powder metallurgy mold is manufactured; according to the precision requirements of the inner contour and the internal thread structure of the 5G antenna fixing seat, the inner die of the powder metallurgy die is manufactured, the dimensional precision of the outer die and the inner die is strictly controlled, the requirement of secondary processing after the product is subjected to one-step compression molding is avoided, and good precision, quality and performance are achieved.
The invention also provides a 5G antenna fixing seat which is manufactured by adopting the forming method of the 5G antenna fixing seat.
The preparation process according to the invention is now described in detail in the following examples:
example 1: the forming method of the 5G antenna fixing base provided by the embodiment includes the following steps:
step one, designing a forming die: designing and manufacturing a powder metallurgy die according to the shape and the internal structure required by the 5G antenna fixing seat, and mounting the powder metallurgy die on a powder metallurgy forming press for later use;
step two, raw material proportioning: by mass percentage, 0.6 percent of carbon powder, 2.1 percent of copper powder, 2.3 percent of nickel powder, 0.8 percent of molybdenum powder, 1.2 percent of chromium powder, 1.6 percent of manganese powder, 2 percent of carbon fiber and the balance of iron powder, wherein the particle size of the raw materials is as follows: carbon powder of 10 mu m, copper powder of 15 mu m, nickel powder of 10 mu m, molybdenum powder of 10 mu m, chromium powder of 10 mu m, manganese powder of 10 mu m and iron powder of 20 mu m, and the diameter of the carbon fiber is 5 mu m;
step three, mixing materials: placing the raw materials in a mixer according to the mass percentage of the second step, and uniformly mixing to obtain mixed powder;
step four, green body forming: placing the mixed powder in the powder metallurgy die to be pressed at a pressing pressure of 150T to obtain a green body;
step five, sintering: according to the set sintering process parameters, under the mixed protective gas of hydrogen and nitrogen with the volume percentage of 3-97, placing the green body in a mesh belt type sintering furnace for pre-sintering treatment, and sintering to obtain a sintered piece, wherein the pre-sintering temperature is 450 ℃, the pre-sintering time is 50min, the sintering temperature is 1050 ℃, and the sintering time is 300 min;
step six, surface treatment: shaping and deburring the sintered part, placing the sintered part in a mesh belt type heat treatment furnace for carbonitriding, carrying out quenching and heat preservation for 1.5h, carrying out low-temperature tempering and heat preservation for 2h, and cooling to obtain a 5G antenna fixing seat; wherein the quenching temperature is 830 ℃, and the tempering temperature is 180 ℃.
The 5G antenna holders prepared in example 1 were subjected to performance parameter measurements. Through measurement, the specific performance parameter measurement results of the 5G antenna fixing seat prepared in the way are shown in table 1.
Comparative example 1: the forming method of the 5G antenna fixing seat in this embodiment is as follows: by mass percent, uniformly mixing 0.6 percent of carbon powder, 2.1 percent of copper powder, 2.3 percent of nickel powder, 0.8 percent of molybdenum powder and the balance of raw materials of iron powder to obtain mixed powder, wherein the particle size of the raw materials is as follows: carbon powder of 10 μm, copper powder of 15 μm, nickel powder of 10 μm, molybdenum powder of 10 μm and iron powder of 20 μm; the rest steps are the same as the forming method of the 5G antenna fixing seat in the embodiment 1.
And (3) measuring performance parameters of the 5G antenna fixing seat prepared in the comparative example 1. Through measurement, the specific performance parameter measurement results of the 5G antenna fixing seat prepared in the way are shown in table 1.
Example 2: the forming method of the 5G antenna fixing base provided by the embodiment includes the following steps:
step one, designing a forming die: designing and manufacturing a powder metallurgy die according to the shape and the internal structure required by the 5G antenna fixing seat, and mounting the powder metallurgy die on a powder metallurgy forming press for later use;
step two, raw material proportioning: by mass percentage, 0.8 percent of carbon powder, 2.5 percent of copper powder, 1.5 percent of nickel powder, 1 percent of molybdenum powder, 2.5 percent of chromium powder, 2 percent of manganese powder, 3 percent of carbon fiber and the balance of iron powder, wherein the particle size of the raw materials is as follows: carbon powder of 10 mu m, copper powder of 20 mu m, nickel powder of 15 mu m, molybdenum powder of 15 mu m, chromium powder of 15 mu m, manganese powder of 15 mu m and iron powder of 25 mu m, and the diameter of the carbon fiber is 5 mu m;
step three, mixing materials: placing the raw materials in a mixer according to the mass percentage of the second step, and uniformly mixing to obtain mixed powder;
step four, green body forming: placing the mixed powder in the powder metallurgy die to be pressed at a pressing pressure of 150T to obtain a green body;
step five, sintering: according to the set sintering process parameters, under the mixed protective gas of hydrogen and nitrogen with the volume percentage of 3-97%, placing the green body in a mesh belt type sintering furnace for sintering to obtain a sintered piece, wherein the sintering temperature is 1200 ℃, and the sintering time is 300 min;
step six, surface treatment: shaping and deburring the sintered part, placing the sintered part in a mesh belt type heat treatment furnace for carbonitriding, carrying out quenching and heat preservation for 2 hours, carrying out low-temperature tempering and heat preservation for 2 hours, and cooling to obtain a 5G antenna fixing seat; wherein the quenching temperature is 830 ℃, and the tempering temperature is 180 ℃.
The 5G antenna holders obtained in example 2 were subjected to performance parameter measurements. Through measurement, the specific performance parameter measurement results of the 5G antenna fixing seat prepared in the way are shown in table 1.
Comparative example 2: the forming method of the 5G antenna fixing seat in this embodiment is as follows: uniformly mixing 0.8% of carbon powder, 2.5% of copper powder, 1.5% of nickel powder, 1% of molybdenum powder and the balance of iron powder by mass percent to obtain mixed powder, wherein the particle size of the raw materials is as follows: carbon powder of 10 μm, copper powder of 20 μm, nickel powder of 15 μm, molybdenum powder of 15 μm and iron powder of 25 μm; the rest steps are the same as the forming method of the 5G antenna fixing seat in the embodiment 2.
And (3) measuring performance parameters of the 5G antenna fixing seat prepared in the comparative example 2. Through measurement, the specific performance parameter measurement results of the 5G antenna fixing seat prepared in the way are shown in table 1.
Example 3: the forming method of the 5G antenna fixing base provided by the embodiment includes the following steps:
step one, designing a forming die: designing and manufacturing a powder metallurgy die according to the shape and the internal structure required by the 5G antenna fixing seat, and mounting the powder metallurgy die on a powder metallurgy forming press for later use;
step two, raw material proportioning: the carbon powder comprises, by mass, 1.2% of carbon powder, 3% of copper powder, 3.5% of nickel powder, 1.5% of molybdenum powder, 3.5% of chromium powder, 3% of manganese powder, 5% of carbon fiber and the balance of iron powder, wherein the particle size of the raw materials is as follows: carbon powder 15 μm, copper powder 22 μm, nickel powder 15 μm, molybdenum powder 10 μm, chromium powder 12 μm, manganese powder 15 μm and iron powder 20 μm, and the diameter of the carbon fiber is 5 μm;
step three, mixing materials: placing the raw materials in a mixer according to the mass percentage of the second step, and uniformly mixing to obtain mixed powder;
step four, green body forming: placing the mixed powder in the powder metallurgy die to be pressed at a pressing pressure of 150T to obtain a green body;
step five, sintering: according to the set sintering process parameters, under the mixed protective gas of hydrogen and nitrogen with the volume percentage of 3-97, placing the green body in a mesh belt type sintering furnace for pre-sintering treatment, and sintering to obtain a sintered piece, wherein the pre-sintering temperature is 550 ℃, the pre-sintering time is 45min, the sintering temperature is 1100 ℃, and the sintering time is 300 min;
step six, surface treatment: shaping and deburring the sintered part, placing the sintered part in a mesh belt type heat treatment furnace for carbonitriding, carrying out quenching and heat preservation for 1.5h, carrying out low-temperature tempering and heat preservation for 2h, and cooling to obtain a 5G antenna fixing seat; wherein the quenching temperature is 830 ℃, and the tempering temperature is 180 ℃.
The 5G antenna holders obtained in example 3 were subjected to performance parameter measurement. Through measurement, the specific performance parameter measurement results of the 5G antenna fixing seat prepared in the way are shown in table 1.
Comparative example 3: the forming method of the 5G antenna fixing seat in this embodiment is as follows: uniformly mixing 1.2% of carbon powder, 3% of copper powder, 3.5% of nickel powder, 1.5% of molybdenum powder and the balance of iron powder by mass percent to obtain mixed powder, wherein the particle size of the raw materials is as follows: 15 μm of carbon powder, 22 μm of copper powder, 15 μm of nickel powder, 10 μm of molybdenum powder and 20 μm of iron powder; the rest steps are the same as the forming method of the 5G antenna fixing seat in the embodiment 3.
And (3) measuring performance parameters of the 5G antenna fixing seat prepared in the comparative example 3. Through measurement, the specific performance parameter measurement results of the 5G antenna fixing seat prepared in the way are shown in table 1.
Example 4: the forming method of the 5G antenna fixing base provided by the embodiment includes the following steps:
step one, designing a forming die: designing and manufacturing a powder metallurgy die according to the shape and the internal structure required by the 5G antenna fixing seat, and mounting the powder metallurgy die on a powder metallurgy forming press for later use;
step two, raw material proportioning: the carbon powder is 1.5 percent, the copper powder is 3.5 percent, the nickel powder is 2.5 percent, the molybdenum powder is 1 percent, the chromium powder is 5 percent, the manganese powder is 4 percent, the carbon fiber is 5 percent, and the balance is iron powder, wherein the particle size of the raw materials is as follows: carbon powder 15 μm, copper powder 20 μm, nickel powder 20 μm, molybdenum powder 12 μm, chromium powder 10 μm, manganese powder 12 μm and iron powder 30 μm, and the diameter of the carbon fiber is 7 μm;
step three, mixing materials: placing the raw materials in a mixer according to the mass percentage of the second step, and uniformly mixing to obtain mixed powder;
step four, green body forming: placing the mixed powder in the powder metallurgy die to be pressed at a pressing pressure of 150T to obtain a green body;
step five, sintering: according to the set sintering process parameters, under the mixed protective gas of hydrogen and nitrogen with the volume percentage of 3-97, placing the green body in a mesh belt type sintering furnace for pre-sintering treatment, and sintering to obtain a sintered piece, wherein the pre-sintering temperature is 500 ℃, the pre-sintering time is 50min, the sintering temperature is 1200 ℃, and the sintering time is 300 min;
step six, surface treatment: shaping and deburring the sintered part, placing the sintered part in a mesh belt type heat treatment furnace for carbonitriding, carrying out quenching and heat preservation for 2 hours, carrying out low-temperature tempering and heat preservation for 2 hours, and cooling to obtain a 5G antenna fixing seat; wherein the quenching temperature is 830 ℃, and the tempering temperature is 180 ℃.
The 5G antenna holders obtained in example 4 were subjected to performance parameter measurement. Through measurement, the specific performance parameter measurement results of the 5G antenna fixing seat prepared in the way are shown in table 1.
Comparative example 4: the forming method of the 5G antenna fixing seat in this embodiment is as follows: uniformly mixing 1.5% of carbon powder, 3.5% of copper powder, 2.5% of nickel powder, 1% of molybdenum powder and the balance of iron powder by mass percent to obtain mixed powder, wherein the particle size of the raw materials is as follows: 15 μm of carbon powder, 20 μm of copper powder, 20 μm of nickel powder, 12 μm of molybdenum powder and 30 μm of iron powder; the rest steps are the same as the forming method of the 5G antenna fixing seat in the embodiment 4.
And (3) measuring performance parameters of the 5G antenna fixing seat prepared in the comparative example 4. Through measurement, the specific performance parameter measurement results of the 5G antenna fixing seat prepared in the way are shown in table 1.
The results of the measurements of the specific performance parameters of examples 1 to 4 and comparative examples 1 to 4 are shown in the following table:
TABLE 1 results of measurement of specific Performance parameters
| Density of green body (g/cm)3) | Density of the product (g/cm)3) | Tensile strength/MPa | Vickers hardness/HV | |
| Example 1 | 7.213 | 7.416 | 436 | 162 |
| Comparative example 1 | 7.043 | 7.269 | 396 | 141 |
| Example 2 | 7.226 | 7.421 | 467 | 168 |
| Comparative example 2 | 7.068 | 7.292 | 402 | 149 |
| Example 3 | 7.229 | 7.423 | 475 | 172 |
| Comparative example 3 | 7.102 | 7.301 | 416 | 153 |
| Example 4 | 7.302 | 7.501 | 483 | 182 |
| Comparative example 4 | 7.124 | 7.313 | 421 | 158 |
The invention adopts the powder of carbon, copper, nickel, molybdenum and the like as a matrix, optimizes the traditional powder system by adding the raw materials of chromium powder, manganese powder, carbon fiber and the like, controls the matching of the raw materials with different grain diameters and different proportion, enhances the bonding performance among the raw materials to ensure that the raw materials are uniformly distributed, avoids the phenomena of cracking, agglomeration and the like after pressing and sintering, ensures that the product achieves good hardness, density, strength and wear resistance, has high utilization rate of the raw materials, adopts the powder metallurgy die with high processing precision to ensure that the pressed product has high-precision external outline and internal structure, has high processing precision and efficiency and low preparation cost, and is suitable for industrial production.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Those skilled in the art can make many possible variations and modifications to the invention using the above disclosed technical means and teachings, or can modify equivalent embodiments with equivalent variations, without departing from the scope of the invention. Therefore, all equivalent changes made according to the shape, structure and principle of the present invention should be covered by the protection scope of the present invention without departing from the contents of the technical scheme of the present invention.
Claims (9)
1. A forming method of a 5G antenna fixing seat is characterized by comprising the following steps:
step one, designing a forming die: designing and manufacturing a powder metallurgy die according to the shape and the internal structure required by the 5G antenna fixing seat, and mounting the powder metallurgy die on a powder metallurgy forming press for later use;
step two, raw material proportioning: by mass percentage, 0.4-1.5% of carbon powder, 1-4% of copper powder, 1-5% of nickel powder, 0.25-2% of molybdenum powder, 0.8-6% of chromium powder, 1-5% of manganese powder, 2-6% of carbon fiber and the balance of iron powder, wherein the particle size of the raw materials is as follows: 6-20 microns of carbon powder, 15-25 microns of copper powder, 10-20 microns of nickel powder, 10-20 microns of molybdenum powder, 10-20 microns of chromium powder, 10-20 microns of manganese powder and 20-50 microns of iron powder, and the diameter of the carbon fiber is 5-7 microns;
step three, mixing materials: uniformly mixing the raw materials according to the mass percentage of the second step to obtain mixed powder;
step four, green body forming: placing the mixed powder in the powder metallurgy die for pressing to obtain a green body;
step five, sintering: placing the green body in a mesh belt type sintering furnace for sintering according to set sintering process parameters to obtain a sintered piece, wherein the sintering temperature is 1050-1350 ℃, and the sintering time is 1-350 min;
step six, surface treatment: placing the sintered part in a mesh-belt type heat treatment furnace for carbonitriding, carrying out quenching and heat preservation for 1.5-2.5 h, then carrying out low-temperature tempering and heat preservation for 2h, and cooling to obtain a 5G antenna fixing seat; wherein the quenching temperature is 830-840 ℃, and the tempering temperature is 180 ℃;
in the first step, according to the precision requirement of the external profile of the 5G antenna fixing seat, manufacturing an external mold of the powder metallurgy mold; and manufacturing the inner die of the powder metallurgy die according to the internal outline of the 5G antenna fixing seat and the precision requirement of the internal thread structure.
2. The method of claim 1, wherein prior to sintering the green compact, the method further comprises: and carrying out pre-sintering treatment on the green body.
3. The forming method of the 5G antenna fixing seat according to claim 2, wherein the pre-sintering temperature is 250-600 ℃, and the pre-sintering time is 45-60 min.
4. The forming method of the 5G antenna fixing seat according to claim 3, wherein in the fifth step, a mixed protective gas of hydrogen and nitrogen is adopted in the mesh belt type sintering furnace, and the volume percentage of the hydrogen to the nitrogen is 3-10: 90 to 97.
5. The method for forming a 5G antenna fixing base according to claim 4, wherein before carbonitriding the sintered part, the method further comprises: and shaping and deburring the sintered part.
6. The method for forming a 5G antenna fixing seat according to claim 1, wherein in the fourth step, the density of the green body is 7.2-7.25G/cm3。
7. The method as claimed in claim 6, wherein the pressing pressure is 150-160T.
8. The method for forming a 5G antenna holder as claimed in claim 6, wherein in step six, the density of the 5G antenna holder is greater than 7.4G/cm3。
9. A5G antenna holder, characterized in that, it is made by the method for forming 5G antenna holder according to any one of claims 1-8.
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| DE102006005250B4 (en) * | 2006-02-02 | 2010-04-29 | Thyssenkrupp Vdm Gmbh | Iron-nickel alloy |
| CN1858288A (en) * | 2006-06-06 | 2006-11-08 | 吉林大学 | Sintered metal material for assembled hollow camshaft and cam and its preparing and treating method |
| CN102383056A (en) * | 2011-09-26 | 2012-03-21 | 上海应用技术学院 | Novel iron-based self-lubricating material and preparation method thereof |
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| CN104028765B (en) * | 2014-06-27 | 2016-01-20 | 张家港振江粉末冶金制品有限公司 | Production method of powder metallurgy part with mounting through hole |
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