CN206887198U - One Albatra metal temperature control pressure regulation smelting apparatus - Google Patents
One Albatra metal temperature control pressure regulation smelting apparatus Download PDFInfo
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- CN206887198U CN206887198U CN201720438091.6U CN201720438091U CN206887198U CN 206887198 U CN206887198 U CN 206887198U CN 201720438091 U CN201720438091 U CN 201720438091U CN 206887198 U CN206887198 U CN 206887198U
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- pressure regulation
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Abstract
The utility model discloses an Albatra metal temperature control pressure regulation smelting apparatus, the device includes closed furnace chamber, power frequency induction furnace, temperature control pressure regulation zinc condensation recovery control climate integrating device, feed door, pressure regulation stove furnace chamber thermometric, auxiliary charging system, the zinc fume in furnace chamber, maintenance fire door, casting device；The utility model proposes a kind of temperature control pressure regulation smelting apparatus, the molten alloy in confined space, liquid metals carburation by evaporation liquefaction process is set to reach dynamic equilibrium, fusion process not evaporate, vaporization, oxidation, slag making loss, improve system pressure, Cu Zn alloys can at higher temperatures melting without " flame ", realize intensified smelting process, shorten melting cycle, improve production efficiency, there is very high economic value and social benefit.
Description
Technical field
The present invention relates to copper and smelting copper alloy field, more particularly to Albatra metal temperature control-pressure regulation smelting apparatus.
Background technology
Traditional smelting copper alloy generally uses normal pressure based on copper fusing point, oxidizing atmosphere melting, existing main
Problem is：In brass of the melting containing zinc, stanniferous, lead, beryllium, phosphorus, cadmium, magnesium, zirconium, the bronze of chromium, containing zinc, aluminium, manganese copper-nickel alloy when, deposit
In strong evaporation, gasification, oxidational losses.If brass melting is using low temperature zincification, flame melting, high temperature slag skimming process.Zinc
419.5 DEG C of fusing point, the fusing point of copper is 1083.5 DEG C, and two clock melting point metals differ 664 DEG C.So-called low temperature zincification technique, operation temperature
For degree typically at 1150 DEG C or so, zincification process necessarily causes the vigorous oxidation and volatilization loss of zinc.So-called flame smelting technology, it is real
Matter is using steam slagging-off, degasification caused by metallic zinc boiling, makes substantial amounts of metallic zinc vaporization, oxidation, slag making.
Induction melting and shaft furnace melting are the basic type of furnaces of melting copper modern times smelting copper alloy, using the benefit of induction melting
It is：Melting energy consumption is relatively low, fusion process without discharge, copper liquid is not polluted.The problem of existing be：Induction melting and shaft furnace melt
Refining can neither adjust melting atmosphere, can not control furnace pressure；During alloy melting, evaporation of metal, oxidation, slag making loss are big.
This project applicant, system investigation once was carried out to domestic and international famous Copper fabrication manufacturer, found：European metal,
The enterprises such as French La-bronze, Italian sitindustry, Norway brass-ingot, using zinc in " flame " technique productions,
Mock platina.Middle aluminium Lip river copper, Tongling brass rod company, Jinchuan Group, which are introduced, has international most advanced level brass founding production
Line, use " flame " technique.Ningbo gold field group is largest domestic brass production base, using " flame " smelting technology.
" flame " melting is still the technique that domestic and international production high zinc-copper alloy generally uses.
The problem of being existed using air atmosphere-normal pressure, " flame " smelting technology be：Low boiling metal constituent element（Tin, zinc, lead
Deng）Oxidation, evaporation, vaporization loss it is very big.During smelting copper alloy, high-temperature metal is easy to and environmental oxidation medium, furnace charge
Oxygen, emulsion, oil response are carried, causes metal slag making to lose.
The content of the invention
The purpose of the present invention is aiming at insufficient existing for above-mentioned prior art, there is provided an Albatra metal temperature control-pressure regulation is melted
Refine device.
Above-mentioned purpose is realized by following proposal：
One Albatra metal temperature control-pressure regulation smelting apparatus, it is characterised in that the device includes closed furnace chamber（1）, line-frequency induction
Stove（2）, temperature control-pressure regulation-zinc condensation-recovery-control climate integrating device（3）, feed door（4）, pressure regulation stove furnace chamber thermometric
（5）, auxiliary charging system（6）, zinc fume (7) in furnace chamber, maintenance fire door（8）, casting device（9）；The power frequency induction furnace
（2）Including sensing furnace body（2a）, inductor（2b）, radiation proof bell（2c）, induction furnace thermometric（2d）, copper alloy liquid（2e）.
According to above-mentioned temperature control-pressure regulation smelting apparatus, it is characterised in that the airtight furnace chamber（1）Body of heater use three-layered node
Structure, for internal layer using the soldering of GH4169 sheet alloys into air tight structure, middle level is lightweight polycrystalline mullite fire resisting-insulation material,
Shell is welded into air tight structure using 926 heat-resisting, the corrosion-resisting steel of German Krupp exploitation.Airtight furnace chamber is temperature control-tune
The working space of melting is pressed, its main function is to maintain and born the high temperature formed in fusion process by evaporation of metal, high pressure gold
Category steam does not scatter and disappear, not aoxidized.
According to above-mentioned temperature control-pressure regulation smelting apparatus, it is characterised in that the power frequency induction furnace（2）Sensing furnace body
（2a）Shell be the soldering of GH4169 sheet alloys into air tight structure, liner by high alumina castable or magnesia castable or
Person's silica sand castable cast-sintering forms.Inductor（2b）Formed including the part such as iron core, water cooled coil, water-cooling system.Anti- spoke
Penetrate bell（2c）For polycrystalline mullite refractory material, bell external structure material is that GH4169 alloys are welded steel construction, stove
Lid can be opened, closed.Induction furnace thermometric（2d）Including it is closed-heat-resisting on the outside of temperature thermocouple, compensating wire, compensating wire-
Protect the parts such as armor.Power frequency induction furnace（2）The alloying process for acting as fusing metal and completing metal.
According to above-mentioned temperature control-pressure regulation smelting apparatus, it is characterised in that the temperature control-pressure regulation-zinc condensation-recovery-atmosphere control
Integrating device processed（3）Including furnace pressure measurement apparatus, zinc fume extraction-condensation-recovery-control climate.It act as melting in alloy
Before refining, high pure nitrogen or argon gas, control and regulating stove internal ambience are passed through into stove.During alloy melting, according to setting
Furnace pressure, by adjusting the dynamic equilibrium of evaporation process and liquefaction process, reach the purpose of control furnace pressure.When furnace pressure reaches setting
Value, and evaporation of metal amount is more than the liquefaction amount of metal vapors, and when the actual furnace pressure of furnace chamber is exceeded setting value, it is cold to start steam
Solidifying-retracting device, the part metals steam in furnace chamber is extracted out, condensed, is liquefied, recovery, making stove room pressure is stable setting
It is worth scope, reaches the purpose of control furnace pressure.The protective atmosphere that device 3 is passed through into furnace chamber 1 can be nitrogen or high pure nitrogen
The either one or several kinds in argon gas or high-purity argon gas or carbon monoxide etc..
According to above-mentioned temperature control-pressure regulation smelting apparatus, it is characterised in that the feed door（4）Using three-decker, internal layer
Using the soldering of GH4169 sheet alloys into air tight structure, middle level is lightweight polycrystalline mullite fire resisting-insulation material, and shell uses
926 heat-resisting, the corrosion-resisting steel of German Krupp exploitation are welded into air tight structure, and feed door is used to add matrix into stove
Alloyed copper, foundry returns, refractory metal nickel, iron etc., main charging process are completed by overhead traveling crane by gallery ports.
According to above-mentioned temperature control-pressure regulation smelting apparatus, it is characterised in that the pressure regulation stove furnace chamber thermometric（5）Controlled for measuring
Temperature-pressure regulation stove furnace chamber pressure.
According to above-mentioned temperature control-pressure regulation smelting apparatus, it is characterised in that the auxiliary charging system（6）Material be GH4169,
Heat-resisting, the anti-corrosion steel construction piece that ZG416 alloy welding assemblies form, for depositing in short-term, to adding volatile alloy member in stove
Plain zinc, lead, beryllium etc..
According to above-mentioned temperature control-pressure regulation smelting apparatus, it is characterised in that the maintenance fire door（8）Installed in furnace chamber sidepiece, adopt
With three-decker, for internal layer using the soldering of GH4169 sheet alloys into air tight structure, middle level is lightweight polycrystalline mullite fire resisting-guarantor
Adiabator, shell is welded into air tight structure using 926 heat-resisting, the corrosion-resisting steel of German Krupp exploitation, for overhauling stove
Body, handling failure.
According to above-mentioned temperature control-pressure regulation smelting apparatus, it is characterised in that the casting device（9）Including metaideophone chute, lock
Plate, casting-crystal system, cooling system, for by the qualified pouring metal melt of melting into qualified alloy cast ingot.
According to above-mentioned processing unit, it is characterised in that the processing unit operation principle is：Melting is closed in confined space
Gold, liquid metals evaporation-vaporization-liquefaction process is set to reach dynamic equilibrium, fusion process does not evaporate, vaporized, aoxidizing, slag making damage
Lose.
According to above-mentioned processing unit, it is characterised in that the processing unit course of work is roughly divided into three phases：First
Stage, which is passed through protective gas into stove and is increased to furnace temperature, is higher by conventional 60-150 DEG C of smelting temperature, and furnace pressure is increased into setting
Furnace pressure, the refractory metal such as rapid melting fine copper, nickel, iron under the conditions of temperature control-pressure regulation；Second stage adds easily into aluminium alloy
Volatile element zinc, lead, beryllium etc., carry out gradually reducing smelting temperature when zinc, lead, beryllium alloy, and utilize zinc vapor condensation, recovery
Device controls-adjust furnace pressure.Phase III adjusts furnace temperature, furnace pressure to room temperature-normal pressure, is closed using refined coppers such as argon gas, flux
Golden liquid.
A kind of temperature control-pressure regulation smelting apparatus proposed by the present invention, the molten alloy in confined space, steams liquid metals
Hair-vaporization-liquefaction process reaches dynamic equilibrium, and fusion process does not evaporate, vaporized, aoxidizing, slag making loss.Raising system pressure
Power, Cu-Zn alloys melting without " flame ", can realize intensified smelting process, shorten melting cycle, carry at higher temperatures
High efficiency.By taking Cu-35%Zn alloys as an example, melting flame temperature is 1035 DEG C；During temperature control-pressure regulation melting, temperature exists
More than 1100 DEG C（Improve 65 DEG C of smelting temperature）Without flame, intensified smelting process, shorten melting cycle, improve production efficiency,
With very high economic value and social benefit.
Brief description of the drawings
Fig. 1 is temperature control-pressure regulation smelting copper alloy furnace structure schematic diagram；
Fig. 2 is temperature control-pressure regulation smelting copper alloy stove charging process schematic diagram；
Fig. 3 is temperature control-pressure regulation smelting copper alloy stove fusion process schematic diagram.
Embodiment
The invention discloses a kind of temperature control-pressure regulation smelting apparatus, the device includes closed furnace chamber（1）, power frequency induction furnace
（2）, temperature control-pressure regulation-zinc condensation-recovery-control climate integrating device（3）, feed door（4）, pressure regulation stove furnace chamber thermometric（5）、
Aid in charging system（6）, zinc fume (7) in furnace chamber, maintenance fire door（8）, casting device（9）；The power frequency induction furnace（2）By
Sense furnace body（2a）, inductor（2b）, radiation proof bell（2c）, induction furnace thermometric（2d）, copper alloy liquid（2e）.
Airtight furnace chamber（1）It is the working space and pressurize container of temperature control-pressure regulation smelting furnace, its main function is to maintain and held
High temperature, high-voltage metal vapour in by fusion process because of evaporation of metal formation do not scatter and disappear, not aoxidized.
Feed door is offered on airtight furnace chamber 1（4）, maintenance fire door（8）, and temperature control-pressure regulation-zinc condensation-recovery-is installed
Control climate integrating device（3）, aid in charging system（6）Installed in the inside of airtight furnace chamber 1, for depositing in short-term, in stove
Add volatile alloy element zinc, lead, beryllium etc..
Power frequency induction furnace 2 has two kinds of mounting means, and a kind of mounting means is integral installation in airtight furnace chamber 1；It is another
Mounting means is that top sensing furnace body 2a is arranged in airtight furnace chamber 1, and inductor 2b is arranged on the outside of airtight furnace chamber 1,
See Fig. 1.Radiation proof bell 2c is arranged on sensing furnace body 2a fire door top, and it is to block high-temperature liquid metal 2e to airtight that it, which is acted on,
The radiant heat transfer of furnace chamber.
Casting device 9 has four kinds of mounting means, and the first mounting means is integral installation in airtight furnace chamber 1；Second
Mounting means is to establish an independent airtight casting chamber close to airtight furnace chamber；The third mounting means is to pacify metaideophone part
In air-tight oven room, cast part is arranged under the atmospheric environment of air-tight oven outdoor, sees Fig. 1；4th kind of mounting means be
Metaideophone, cast part are installed under the atmospheric environment of air-tight oven outdoor.
The operation principle of temperature control of the present invention-pressure regulation smelting apparatus is：The molten alloy in confined space, make liquid golden
Category evaporation-vaporization-liquefaction process reaches dynamic equilibrium, and fusion process does not evaporate, vaporized, aoxidizing, slag making loss.
The course of work of temperature control of the present invention-pressure regulation smelting apparatus is roughly divided into three phases：First stage is into stove
It is passed through protective gas and is increased to furnace temperature and be higher by conventional 60-150 DEG C of smelting temperature, furnace pressure is increased to setting furnace pressure, controlled
The refractory metal such as rapid melting fine copper, nickel, iron under the conditions of temperature-pressure regulation；Second stage adds Volatile Elements into aluminium alloy
Zinc, lead, beryllium etc., carry out gradually reducing smelting temperature when zinc, lead, beryllium alloy, and utilize zinc vapor condensation, retracting device control
System-regulation furnace pressure.Phase III adjusts furnace temperature, furnace pressure to room temperature-normal pressure, and copper alloy liquid is refined using argon gas, flux etc..
A kind of temperature control-pressure regulation smelting apparatus proposed by the present invention, the molten alloy in confined space, steams liquid metals
Hair-vaporization-liquefaction process reaches dynamic equilibrium, and fusion process does not evaporate, vaporized, aoxidizing, slag making loss.Raising system pressure
Power, Cu-Zn alloys melting without " flame ", can realize intensified smelting process, shorten melting cycle, carry at higher temperatures
High efficiency.By taking Cu-35%Zn alloys as an example, melting flame temperature is 1035 DEG C；During temperature control-pressure regulation melting, temperature exists
More than 1100 DEG C（Improve 65 DEG C of smelting temperature）Without flame, intensified smelting process, shorten melting cycle, improve production efficiency,
With very high economic value and social benefit.
Embodiment 1：Temperature control-pressure regulation melting Cu-35%Zn alloys
According to the method shown in Fig. 2, the cathode copper for accounting for dosage 60% is added in power frequency induction furnace 2.By the copper of surplus,
Low-melting-point metal zinc is fitted into auxiliary feeding device 6.It is closing and sealing off feed door 4, maintenance fire door 8.By temperature control-pressure regulation-
Zinc condensation-recovery-control climate integrating device 3 is passed through high pure nitrogen into closed furnace chamber 1.Furnace pressure is adjusted to 8atm, to work
The power transmission of frequency induction furnace 2, under pressure control, ar gas environment, the cathode copper for accounting for dosage 60% is melted, fusion temperature is compared with traditional handicraft
Under the conditions of fusion temperature（1130-1180℃）It is higher by 100 DEG C.Treat that copper material melts.High temperature, it is with pressure under the conditions of to fusing copper liquid
In plus 35 %Zn（The more conventional fusion temperature of fusion temperature（1080-1130 DEG C of Cu-35%Zn alloy tradition smelting temperature）It is higher by 30-
90 DEG C, rapid melting low boiling, the metallic zinc of easy evaporation-vaporization.Under the conditions of high temperature, protective atmosphere, pressure control, rapid melting
Fine copper copper material, rapid melting low boiling, the metallic zinc of easy evaporation-vaporization.Be completely melt after alloy-alloying after, using reserved
5% copper cold burden by copper liquid temperature adjustment to 1070-1100 DEG C of casting temperature.Using the gas refinement of routine, flux-refining, electroslag
The methods of refining, ceramic filter, is to copper liquid degasification, slagging-off.The copper liquid after degasification, slagging-off is cast using the casting method of routine
Into qualified ingot casting.Off-test, takes alloy analysis sample, and alloy composition is：Zn, 34.8%；Cu, surplus.
Embodiment 2：Using temperature control-pressure regulation method melting Cu-35%Zn-2%Sn alloys
According to the method shown in Fig. 2, the cathode copper for accounting for dosage 58% is added in power frequency induction furnace 2.By the copper of surplus,
Low-melting-point metal zinc, metallic tin are fitted into auxiliary feeding device 6.It is closing and sealing off feed door 4, maintenance fire door 8.Pass through control
Temperature-pressure regulation-zinc condensation-recovery-control climate integrating device 3 is passed through high-purity argon gas into closed furnace chamber 1.Furnace pressure is adjusted to
15atm, the power transmission of power frequency induction furnace 2 is given, under pressure control, ar gas environment, the cathode copper for accounting for dosage 58% is melted, fusion temperature
Compared with fusion temperature under conventional process conditions（1130-1180℃）It is higher by 130 DEG C.Treat copper material melt, high temperature, it is with pressure under the conditions of to
Add 35 %Zn in the copper liquid of fusing（The more conventional fusion temperature of fusion temperature（Cu-35%Zn alloy tradition smelting temperatures 1080-1130
℃）It is higher by 30-90 DEG C.Rapid melting low boiling, the metallic zinc of easy evaporation-vaporization, treat that zinc is completely melt, utilize auxiliary charging dress
Put added into copper liquid 2% tin.Under the conditions of high temperature, protective atmosphere, pressure control, rapid melting fine copper copper material, rapid melting are low
Boiling point, the metallic zinc of easy evaporation-vaporization, metallic tin.Be completely melt after alloy-alloying after, utilize reserved 5% copper cold burden
By copper liquid temperature adjustment to 1070-1100 DEG C of casting temperature.Using the gas refinement of routine, flux-refining, electroslag refining, ceramic filter
The methods of to copper liquid degasification, slagging-off.Copper liquid after degasification, slagging-off is cast as by qualified ingot casting using the casting method of routine.
Off-test, takes alloy analysis sample, and alloy composition is：Zn, 35.3%；Sn, 1.96%；Cu, surplus.
Embodiment 3：Using temperature control-pressure regulation method melting Cu-38%Zn-2%Ni alloys
According to the method shown in Fig. 2, the cathode copper for accounting for dosage 55% is added in power frequency induction furnace 2.By 2% nickel, remaining
Copper, the low-melting-point metal zinc of amount are fitted into auxiliary feeding device 6.It is closing and sealing off feed door 4, maintenance fire door 8.Pass through control
Temperature-pressure regulation-zinc condensation-recovery-control climate integrating device 3 is passed through high-purity argon gas into closed furnace chamber 1.Furnace pressure is adjusted to
30atm, the power transmission of power frequency induction furnace 2 is given, under pressure control, ar gas environment, the cathode copper for accounting for dosage 55% is melted, fusion temperature
Compared with fusion temperature under conventional process conditions（1130-1180℃）It is higher by 180 DEG C.Treat copper material melt, high temperature, it is with pressure under the conditions of to
2% metallic nickel is added in the copper liquid of fusing, dissolves metallic nickel using high-temperature copper liquid.Treat that nickel is completely melt, copper liquid temperature is adjusted
To 1200 DEG C.Then, 38 % Zn is added into corronil liquid.Rapid melting low boiling, the metallic zinc of easy evaporation-vaporization.
Under the conditions of high temperature, protective atmosphere, pressure control, rapid melting fine copper, pure nickel, rapid melting low boiling, the gold of easy evaporation-vaporization
Belong to zinc.During zinc is changed, regulate and control furnace pressure using device 3, when vapor pressure of metal exceedes setting furnace pressure 30atm in closed furnace chamber
20% when, starter 3, metal zinc fume, condensation zinc fume are extracted out from closed furnace chamber, to reach the purpose of control furnace pressure.
And according to the metallic zinc amount of extraction, metallic zinc is supplemented to molten metal using auxiliary feeding device.Treat that alloy is completely melt-alloying
Afterwards, using reserved 5% copper cold burden by copper liquid temperature adjustment to 1050-1080 DEG C of casting temperature.Using the gas refinement of routine, melt
The methods of agent refining, electroslag refining, ceramic filter, is to copper liquid degasification, slagging-off.Using the casting method of routine by after degasification, slagging-off
Copper liquid be cast as qualified ingot casting.Off-test, takes alloy analysis sample, and alloy composition is：Zn, 37.6%；Ni,
2.1%；Cu, surplus.
Claims (2)
- A 1. Albatra metal temperature control-pressure regulation smelting apparatus, it is characterised in that described refining device includes closed furnace chamber, power frequency sense Answer stove, temperature control-pressure regulation-zinc condensation-recovery-control climate integrating device, feed door, pressure regulation stove furnace chamber thermometric, auxiliary charging System, maintenance fire door, casting device；Described power frequency induction furnace includes sensing furnace body, inductor, radiation proof bell, sensing Stove thermometric；The body of heater of described closed furnace chamber uses three-decker, and internal layer uses the soldering of GH4169 sheet alloys into air-tightness knot Structure, middle level are lightweight polycrystalline mullite fire resisting-insulation material, and shell is 926 heat-resisting, anti-corrosion using the exploitation of German Krupp Steel is welded into air tight structure, and airtight furnace chamber is the working space of temperature control-pressure regulation melting；Described temperature control-pressure regulation-zinc condensation- Recovery-control climate integrating device includes furnace pressure measurement apparatus, zinc fume extraction-condensation-recovery-control climate；Described adds Material fire door uses three-decker, and for internal layer using the soldering of GH4169 sheet alloys into air tight structure, middle level is that lightweight polycrystalline does not come Stone fire resisting-insulation material, shell are welded into air tight structure using 926 heat-resisting, the corrosion-resisting steel of German Krupp exploitation；Institute The pressure regulation stove furnace chamber thermometric stated is used to measure temperature control-pressure regulation stove furnace chamber pressure；Described auxiliary charging system material be GH4169, Heat-resisting, the anti-corrosion steel construction piece that ZG416 alloy welding assemblies form；Described maintenance fire door is arranged on furnace chamber sidepiece, using three Rotating fields, for internal layer using the soldering of GH4169 sheet alloys into air tight structure, middle level is lightweight polycrystalline mullite fire resisting-thermal insulating material Material, shell are welded into air tight structure using 926 heat-resisting, the corrosion-resisting steel of German Krupp exploitation；Described casting device Including metaideophone chute, flashboard, casting-crystal system, cooling system.
- 2. Albatra metal temperature control-pressure regulation smelting apparatus according to claim 1, it is characterised in that power frequency induction furnace Sense furnace body shell for the soldering of GH4169 sheet alloys into air tight structure, liner material is high alumina castable or magnesium Sand castable or silica sand castable；Inductor includes iron core, water cooled coil, water-cooling system, and radiation proof bell is that polycrystalline does not come Stone refractory material, bell external structure material are that GH4169 alloys are welded steel construction, and bell can be opened, closed, and be sensed Stove thermometric includes closed-heat-resisting on the outside of temperature thermocouple, compensating wire, compensating wire-protection armor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720438091.6U CN206887198U (en) | 2017-04-25 | 2017-04-25 | One Albatra metal temperature control pressure regulation smelting apparatus |
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| CN201720438091.6U CN206887198U (en) | 2017-04-25 | 2017-04-25 | One Albatra metal temperature control pressure regulation smelting apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455196A (en) * | 2020-03-09 | 2020-07-28 | 福建省长乐市华拓五金有限公司 | Treatment method for chromium bronze scrap regeneration |
| CN113136498A (en) * | 2021-04-28 | 2021-07-20 | 深圳市注成科技股份有限公司 | Brass MIM process preparation method |
-
2017
- 2017-04-25 CN CN201720438091.6U patent/CN206887198U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455196A (en) * | 2020-03-09 | 2020-07-28 | 福建省长乐市华拓五金有限公司 | Treatment method for chromium bronze scrap regeneration |
| CN113136498A (en) * | 2021-04-28 | 2021-07-20 | 深圳市注成科技股份有限公司 | Brass MIM process preparation method |
| CN113136498B (en) * | 2021-04-28 | 2022-05-27 | 深圳市注成科技股份有限公司 | Brass MIM process preparation method |
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