CN106244870A - A kind of production technology of automobile diecast parts - Google Patents
A kind of production technology of automobile diecast parts Download PDFInfo
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- CN106244870A CN106244870A CN201610796047.2A CN201610796047A CN106244870A CN 106244870 A CN106244870 A CN 106244870A CN 201610796047 A CN201610796047 A CN 201610796047A CN 106244870 A CN106244870 A CN 106244870A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
- C22C21/04—Modified aluminium-silicon alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/006—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using reactive gases
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses the production technology of a kind of automobile diecast parts, including configuration raw material, alloy melting, Metamorphism treatment, electromagnetic agitation, fill the processing steps such as chlorine dehydrogenation, matched moulds note oxygen, vacuum pressure injection, stripping forming and solution aging；Using the automobile diecast parts good mechanical property that present invention process produces, product quality is high, can meet performance requirement and the superior automobile high-quality requirement to parts of vehicle key parts.
Description
Technical field
The present invention relates to a kind of auto parts processing technique field, be specifically related to the life of a kind of aluminium alloy automobile diecast parts
Production. art.
Background technology
In aluminum alloy die casting, the application on automobile is widely, but most aluminium alloy car die casting of the prior art
Part uses simple process manufacture, and its performance is the highest, it is impossible to meet key components and parts performance requirement or superior automobile to parts
High-quality requirement.Publication date is on May 22nd, 2013, and the Chinese patent literature of Publication No. CN 103111596 A discloses one
Plant automobile speed variator extrusion process, including step one: prepare before die casting；Step 2: die casting operation, i.e. first at die casting
One layer of releasing agent of surface spraying；Being inserted into loosing core, the order inserted of loosing core is: loose piece → front-slider and rear slider → left slider
With right slide block；Followed by matched moulds；Injection is started after matched moulds is complete；After treating that injection completes, start die sinking；Die sinking completes it
After, extraction is loosed core, and the order extracted out of loosing core is: left slider and right slide block → front-slider and rear slider；Finally blank is taken out, and
Liftout attachment is used to be ejected by loose piece；Step 3: die casting post processing.This automobile speed variator aluminum alloy die casting is simply used
Replace existing automobile speed variator black sand casting process exist production efficiency low, conforming product rate is on the low side, produce
Bad environments, production cost are higher and are not suitable for the problem of automotive light weight technology, but this die casting performance is the highest, it is impossible to meet
Key components and parts performance requirement or the superior automobile high-quality requirement to parts.
Summary of the invention
It is an object of the invention to the aluminium alloy car die casting performance for solving prior art the highest, it is impossible to meet crucial zero
The problem that component capabilities requires and the high-quality of parts is required by superior automobile, it is provided that a kind of high-quality automobile diecast parts
Production technology.
The concrete technical scheme that the present invention is used for achieving the above object is, the production work of a kind of automobile diecast parts
Skill, comprises the following steps:
A. raw material is configured: in parts by weight, including the silicon of 8.5-9.5 part, the copper of 2.5-3.5 part, the aluminum of 80-82 part.This
Bright middle silicon is as main addition element, and silicon, keeping that aluminium alloy density is little, while specific strength high, can improve flowing
Property, improve the casting character of aluminium alloy, reduce hot cracking tendency and the shrinkage factor of aluminium alloy, improve the compactness of cast member；Add
The purpose of copper mainly improves the mechanical performance of aluminium alloy.
B. alloy melting: aluminum, silicon, copper are preheated to 260-270 DEG C, first adds aluminum in smelting furnace and melts, and aluminum all melts
After change, liquation is warming up to 720-730 DEG C, puts into silicon and copper, after being fully immersed into, alloy molten solution is controlled at 760-780 DEG C.
C. Metamorphism treatment: in parts by weight, puts the alterant strontium of 0.3-0.5 part with the form of intermediate alloy Al-10%Sr
Enter smelting furnace, when melt temperature gos up to 760-780 DEG C, carry out Metamorphism treatment, keep temperature after stirring and stand 6-8
Minute.Owing to the Eutectic Silicon in Al-Si Cast Alloys in cast Al-Si alloy is thick needle-like or lamellar, intensity and the plasticity of aluminium alloy can be reduced, add
Enter alterant and can change the form of Eutectic Silicon in Al-Si Cast Alloys, thus improve the performance of aluminium alloy significantly.It addition, intermediate alloy Al-10% here
Aluminum in Sr is not in step a in the range of the weight portion of aluminum.
D. electromagnetic agitation: the alloy molten solution after standing moves in holding furnace, alloy molten solution is applied electromagnetic field, makes alloy
Liquation produces inductive loop, implements electromagnetic agitation, keeps the temperature in holding furnace to be 720-740 DEG C simultaneously.Electromagnetic agitation is permissible
Remove the bubble in alloy molten solution, increase the compactness of aluminum box gold.
E. chlorine dehydrogenation is filled: in alloy molten solution, be passed through dry chlorine by graphite-pipe, remove the hydrogen in alloy molten solution,
The flow of chlorine is 0.8-1.2 liter/second, and the process time is 3-4 minute.In alloy molten solution, it is passed through dry chlorine, utilizes chlorine
Gas and the hydrogen in alloy molten solution react to generate and are prone to the hydrogen chloride of volatilization and make the hydrogen in alloy molten solution be removed.
F. matched moulds note oxygen: mould closed forming cavity and running channel, by being arranged on the injecting hole in downstream, sprue gate to pressure
Inject oxygen in the injection chamber of casting mould and die cavity, drive away the air in injection chamber and die cavity, cleaning injection chamber and die cavity, inject
The oxygen time continues the 10-15 second, and pressure is 0.8-1.2 MPa.Inject oxygen can be discharged by the air in injection chamber and die cavity,
Only remain a small amount of oxygen, these oxygen and the metal reaction in alloy molten solution when die casting in die cavity, generate oxide fine particle and divide
Cloth is in aluminium alloy, and these microgranules can improve case hardness and the bulk strength of diecast parts, and note oxygen eliminates die casting simultaneously
Pore in part, is conducive to the heat treatment to diecast parts or welding operation, substantially increases the quality of finished product.
G. vacuum pressure injection: stop die cavity and injection chamber are noted oxygen and taken out die cavity and injection chamber very from the top of die casting
Empty；Injecting alloy molten solution from pouring slot in injection chamber, the temperature of pressure injection time control alloyage liquation is 690-710 DEG C, has injected
Become back punching head to be pressed into injection chamber with the speed of 0.2-0.3 meter per second, make the alloy molten solution in injection chamber enter die cavity through running channel, when
Drift march to injection chamber volume three/for the moment, stop evacuation and also make drift linearly accelerate, march to injection to drift
Room volume 2/3rds time, the press-in speed of drift accelerates to 3-4 meter per second, after drift has been pressed into, keep punch pressure
12-15MPa, until diecast parts solidification.
H. stripping forming: the demoulding is taken out after diecast parts cools down.
As preferably, in the raw material of aluminium alloy, in parts by weight, the ferrum of 0.5-0.6 part, 0.1-0.15 are also included
The molybdenum of part, the magnesium of 0.3-0.4 part and the manganese of 0.3-0.4% part.Add the pressure of ferrum and the combination beneficially raising alloy molten solution of molybdenum
Casting performance, and it is possible to prevent that aluminium alloy is viscous to be amassed on mould；The combination adding magnesium and manganese can improve aluminium alloy to a greater degree
Stability.
As preferably, in step e, after being passed through chlorine treatment, holding furnace being applied low-frequency mechanical vibrations, frequency of vibration is
20-80Hz, maximum vibration amplitude is 3-5mm, and the time is 3-5 minute.Alloy molten solution can be removed further by mechanical vibration
In pore.
As preferably, described vibration is variant-frequency vibration, and its frequency of vibration is increased to 80 Hz by 20 Hz, again by 80 Hz
Being reduced to 20 Hz circulation change, the cycle of circulation is the 10-20 second.Mechanical vibration can remove the gas in alloy molten solution further
Hole.Use frequency conversion cycling cycling vibration mode can improve the removal effect of pore further.
As preferably, in step g, during vacuum pressure injection, the vacuum degree control of die cavity is at 15-20kPa.
As preferably, after the diecast parts demoulding is taken out, diecast parts being carried out solution treated, solution treated is twice, the
One time solution treated temperature is 490-500 DEG C, and the time is 3-4 hour；Solution treated temperature is 510-520 DEG C for the second time, the time
For 6-8 hour, the coolant of twice solution treated was the hot water of 55-65 DEG C.Diecast parts after solution treated is carried out at timeliness
Reason, the temperature of Ageing Treatment is 175-185 DEG C, and the time is 3.5-4.5 hour, room temperature cooling after Ageing Treatment.Solid by twice
Molten process and an Ageing Treatment, can improve the tensile strength of aluminium alloy further, improve plasticity, improve end product quality.
As preferably, before vacuum pressure injection starts, die casting is heated, makes mold temperature reach 200-220 degree,
And keep 8-10 minute.
The invention has the beneficial effects as follows, the aluminium alloy car die casting performance that it efficiently solves prior art is the highest,
The problem that the high-quality of parts is required by key components and parts performance requirement and superior automobile can not be met, use present invention process
The automobile diecast parts good mechanical property produced, product quality is high, can meet performance requirement and the height of vehicle key parts
The shelves automobile high-quality requirement to parts.
Accompanying drawing explanation
Fig. 1 is a kind of FB(flow block) of automobile diecast parts production technology of the present invention.
Detailed description of the invention
Below by embodiment, and combine accompanying drawing the detailed description of the invention of the present invention is described in further detail.
Embodiment 1
In the embodiment 1 shown in Fig. 1, the production technology of a kind of automobile diecast parts, comprise the following steps:
A. raw material is configured: in parts by weight, including the aluminum of 80-82 part, the silicon of 8.5-9.5 part, the copper of 2.5-3.5 part, 0.5-
The ferrum of 0.6 part, the molybdenum of 0.1-0.15 part, the magnesium of 0.3-0.4 part and the manganese of 0.3-0.4% part.
B. alloy melting: aluminum, silicon, copper, ferrum, molybdenum, magnesium and manganese are preheated to 260-270 DEG C, first aluminum are added in smelting furnace
Fusing, liquation is warming up to 720-730 DEG C after all melting by aluminum, puts into silicon, copper, ferrum, molybdenum, magnesium and manganese, will close after being fully immersed into
Gold liquation controls at 760-780 DEG C；
C. Metamorphism treatment: in parts by weight, puts into molten by the alterant strontium of 0.3-0.5 part with the form of intermediate alloy Al-10%Sr
Furnace, carries out Metamorphism treatment when melt temperature gos up to 760-780 DEG C, keeps temperature and stand 6-8 minute after stirring.
D. electromagnetic agitation: the alloy molten solution after standing moves in holding furnace, alloy molten solution is applied electromagnetic field, makes alloy
Liquation produces inductive loop, implements electromagnetic agitation, keeps the temperature in holding furnace to be 720-740 DEG C simultaneously；
E. chlorine dehydrogenation is filled: in alloy molten solution, be passed through dry chlorine by graphite-pipe, remove the hydrogen in alloy molten solution, chlorine
Flow be 0.8-1.2 liter/second, the process time is 3-4 minute；After being passed through chlorine treatment, holding furnace is applied Low-Frequency Mechanical to shake
Dynamic, frequency of vibration is 20-80Hz, and maximum vibration amplitude is 3-5mm, and the time is 3-5 minute；Described vibration is variant-frequency vibration,
Its frequency of vibration is increased to 80 Hz by 20 Hz, is reduced to 20 Hz circulation change by 80 Hz again, and the cycle of circulation is 10-20
Second.
F. matched moulds note oxygen: mould closed forming cavity and running channel, by being arranged on the injecting hole in downstream, sprue gate to pressure
Inject oxygen in the injection chamber of casting mould and die cavity, drive away the air in injection chamber and die cavity, cleaning injection chamber and die cavity, inject
The oxygen time continues the 10-15 second, and pressure is 0.8-1.2 MPa.
G. vacuum pressure injection: stop die cavity and injection chamber are noted oxygen and taken out die cavity and injection chamber very from the top of die casting
Sky, its vacuum degree control is at 15-20kPa, from pouring slot to injection alloy molten solution in injection chamber, pressure injection time control alloyage liquation
Temperature is 690-710 DEG C, has injected back punching head and has been pressed into injection chamber with the speed of 0.2-0.3 meter per second, has made the alloy in injection chamber
Liquation enters die cavity through running channel, when drift march to injection chamber volume three/for the moment, stop evacuation and also make drift linear
Accelerating, when marching to 2/3rds of injection chamber volume to drift, the press-in speed of drift accelerates to 3-4 meter per second, and drift is pressed into
After completing, keep punch pressure 12-15MPa, until diecast parts solidification.It addition, before vacuum pressure injection starts, first to compression mod
Tool heats, and makes mold temperature reach 200-220 degree, and keeps 8-10 minute.
H. stripping forming: the demoulding is taken out after diecast parts cools down.
I. after the diecast parts demoulding is taken out, diecast parts being carried out solution treated, solution treated is twice, the most solid molten
Treatment temperature is 490-500 DEG C, and the time is 3-4 hour；Solution treated temperature is 510-520 DEG C for the second time, and the time is that 6-8 is little
Time, the coolant of twice solution treated is the hot water of 55-65 DEG C.
J. diecast parts after solution treated being carried out Ageing Treatment, the temperature of Ageing Treatment is 175-185 DEG C, and the time is
3.5-4.5 hour, room temperature cooling after Ageing Treatment.
In addition to the implementation, in the scope disclosed in claims of the present invention and description, the skill of the present invention
Art feature or technical data can reselect and combine, thus constitute new embodiment, and these present invention are the most in detail
The thin embodiment described is that those skilled in the art just can realize easily without creative work, and therefore these are the most detailed
The embodiment described also should be regarded as the specific embodiment of the present invention and within protection scope of the present invention.
Claims (8)
1. a production technology for automobile diecast parts, is characterized in that comprising the following steps:
A. raw material is configured: in parts by weight, including the silicon of 8.5-9.5 part, the copper of 2.5-3.5 part, the aluminum of 80-82 part；
B. alloy melting: aluminum, silicon, copper are preheated to 260-270 DEG C, first adds aluminum in smelting furnace and melts, after aluminum all melts
Liquation is warming up to 720-730 DEG C, puts into silicon and copper, after being fully immersed into, alloy molten solution is controlled at 760-780 DEG C；
C. Metamorphism treatment: in parts by weight, puts into molten by the alterant strontium of 0.3-0.5 part with the form of intermediate alloy Al-10%Sr
Furnace, carries out Metamorphism treatment when melt temperature gos up to 760-780 DEG C, keeps temperature and stand 6-8 minute after stirring；
D. electromagnetic agitation: the alloy molten solution after standing moves in holding furnace, alloy molten solution is applied electromagnetic field, makes alloy molten solution
Produce inductive loop, implement electromagnetic agitation, keep the temperature in holding furnace to be 720-740 DEG C simultaneously；
E. chlorine dehydrogenation is filled: in alloy molten solution, be passed through dry chlorine by graphite-pipe, remove the hydrogen in alloy molten solution, chlorine
Flow be 0.8-1.2 liter/second, the process time is 3-4 minute；
F. matched moulds note oxygen: mould closed forming cavity and running channel, by being arranged on the injecting hole in downstream, sprue gate to compression mod
Inject oxygen in the injection chamber of tool and die cavity, drive away the air in injection chamber and die cavity, cleaning injection chamber and die cavity, inject oxygen
Time continues the 10-15 second, and pressure is 0.8-1.2 MPa；
G. vacuum pressure injection: stop die cavity and injection chamber are noted oxygen and from the top of die casting to die cavity and injection chamber evacuation；
Injecting alloy molten solution from pouring slot in injection chamber, the temperature of pressure injection time control alloyage liquation is 690-710 DEG C, after having injected
Drift is pressed into injection chamber with the speed of 0.2-0.3 meter per second, makes the alloy molten solution in injection chamber enter die cavity through running channel, works as drift
March to injection chamber volume three/for the moment, stop evacuation and also make drift linearly accelerate, march to injection chamber to drift and hold
When long-pending 2/3rds, the press-in speed of drift accelerates to 3-4 meter per second, after drift be pressed into, and holding punch pressure 12-
15MPa, until diecast parts solidification；
H. stripping forming: the demoulding is taken out after diecast parts cools down.
The production technology of automobile diecast parts the most according to claim 1, is characterized in that, in the raw material of aluminium alloy,
In parts by weight, also include the ferrum of 0.5-0.6 part, the molybdenum of 0.1-0.15 part, the magnesium of 0.3-0.4 part and 0.3-0.4% part
Manganese.
The production technology of automobile diecast parts the most according to claim 1, is characterized in that, in step e, is passed through at chlorine
After reason, holding furnace being applied low-frequency mechanical vibrations, frequency of vibration is 20-80Hz, and maximum vibration amplitude is 3-5mm, and the time is 3-5
Minute.
The production technology of automobile diecast parts the most according to claim 3, is characterized in that, described vibration is that frequency conversion is shaken
Dynamic, its frequency of vibration is increased to 80 Hz by 20 Hz, is reduced to 20 Hz circulation change by 80 Hz again, and the cycle of circulation is 10-
20 seconds.
The production technology of automobile diecast parts the most according to claim 1, is characterized in that, in step g, during vacuum pressure injection
The vacuum degree control of die cavity is at 15-20kPa.
The production technology of automobile diecast parts the most according to claim 1, is characterized in that, after the diecast parts demoulding is taken out,
Diecast parts is carried out solution treated, and solution treated is twice, and solution treated temperature is 490-500 DEG C for the first time, and the time is 3-4
Hour；Solution treated temperature is 510-520 DEG C for the second time, and the time is 6-8 hour, and the coolant of twice solution treated is 55-65
DEG C hot water.
The production technology of automobile diecast parts the most according to claim 6, is characterized in that, to diecast parts after solution treated
Carrying out Ageing Treatment, the temperature of Ageing Treatment is 175-185 DEG C, and the time is 3.5-4.5 hour, room temperature cooling after Ageing Treatment.
8., according to the production technology of the automobile diecast parts described in any one of claim 1-7, it is characterized in that, open in vacuum pressure injection
Before beginning, die casting is heated, make mold temperature reach 200-220 degree, and keep 8-10 minute.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106756300A (en) * | 2017-01-09 | 2017-05-31 | 重庆长安汽车股份有限公司 | One kind is without cylinder sleeve aluminium alloy cylinder evacuated die-casting process method |
| CN107900305A (en) * | 2017-12-28 | 2018-04-13 | 重庆仟和镁业科技有限公司 | A kind of production method of automobile control arm |
| CN108796315A (en) * | 2018-07-21 | 2018-11-13 | 安徽启慧信息科技有限公司 | A kind of production technology of automobile diecast parts |
| CN110434308A (en) * | 2019-08-28 | 2019-11-12 | 杭州富阳宏泰精密铸件有限公司 | A kind of die-casting process process |
| CN110541095A (en) * | 2019-08-29 | 2019-12-06 | 金榀精密工业(苏州)有限公司 | Preparation method of high-performance aluminum alloy automobile parts |
| CN110551929A (en) * | 2019-08-30 | 2019-12-10 | 金榀精密工业(苏州)有限公司 | automobile part die-casting production process |
| CN110938756A (en) * | 2019-10-10 | 2020-03-31 | 全椒县同鑫模具配套有限公司 | Cast aluminum part machining process |
| CN111375739A (en) * | 2019-12-11 | 2020-07-07 | 金榀精密工业(苏州)有限公司 | Efficient controllable semi-solid die casting process |
| CN112404389A (en) * | 2020-11-18 | 2021-02-26 | 无锡市斌悦机械科技有限公司 | Die casting process of main body die |
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|---|---|---|---|---|
| CN106756300A (en) * | 2017-01-09 | 2017-05-31 | 重庆长安汽车股份有限公司 | One kind is without cylinder sleeve aluminium alloy cylinder evacuated die-casting process method |
| CN107900305B (en) * | 2017-12-28 | 2020-02-14 | 重庆仟和镁业科技有限公司 | Production method of automobile control arm |
| CN107900305A (en) * | 2017-12-28 | 2018-04-13 | 重庆仟和镁业科技有限公司 | A kind of production method of automobile control arm |
| CN108796315A (en) * | 2018-07-21 | 2018-11-13 | 安徽启慧信息科技有限公司 | A kind of production technology of automobile diecast parts |
| CN110434308A (en) * | 2019-08-28 | 2019-11-12 | 杭州富阳宏泰精密铸件有限公司 | A kind of die-casting process process |
| CN110541095A (en) * | 2019-08-29 | 2019-12-06 | 金榀精密工业(苏州)有限公司 | Preparation method of high-performance aluminum alloy automobile parts |
| CN110551929A (en) * | 2019-08-30 | 2019-12-10 | 金榀精密工业(苏州)有限公司 | automobile part die-casting production process |
| CN110938756A (en) * | 2019-10-10 | 2020-03-31 | 全椒县同鑫模具配套有限公司 | Cast aluminum part machining process |
| CN111375739A (en) * | 2019-12-11 | 2020-07-07 | 金榀精密工业(苏州)有限公司 | Efficient controllable semi-solid die casting process |
| CN111375739B (en) * | 2019-12-11 | 2021-11-09 | 金榀精密工业(苏州)有限公司 | Efficient controllable semi-solid die casting process |
| CN112404389A (en) * | 2020-11-18 | 2021-02-26 | 无锡市斌悦机械科技有限公司 | Die casting process of main body die |
| CN112623040A (en) * | 2020-12-28 | 2021-04-09 | 湖南大学 | Structure for front vehicle body integrated installation and manufacturing method thereof |
| CN112623040B (en) * | 2020-12-28 | 2022-04-01 | 湖南大学 | Structure for front vehicle body integrated installation and manufacturing method thereof |
| CN112962001A (en) * | 2021-01-11 | 2021-06-15 | 南昌大学 | Method for preparing graphene reinforced aluminum-based composite material by composite process |
| CN114381639A (en) * | 2022-01-07 | 2022-04-22 | 山东创新精密科技有限公司 | High-strength corrosion-resistant aluminum alloy for ships and preparation method thereof |
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Denomination of invention: A production process for automotive die-casting parts Effective date of registration: 20230707 Granted publication date: 20180309 Pledgee: Zhejiang Tailong Commercial Bank Co.,Ltd. Ningbo Beilun sub branch Pledgor: NINGBO HUANYA MANUFACTORY Co.,Ltd. Registration number: Y2023980047763 |
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