CN113369460A - Die casting preparation method - Google Patents
Die casting preparation method Download PDFInfo
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- CN113369460A CN113369460A CN202110474520.6A CN202110474520A CN113369460A CN 113369460 A CN113369460 A CN 113369460A CN 202110474520 A CN202110474520 A CN 202110474520A CN 113369460 A CN113369460 A CN 113369460A
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- 238000004512 die casting Methods 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000005266 casting Methods 0.000 claims abstract description 97
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000011049 filling Methods 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000002344 surface layer Substances 0.000 claims abstract description 13
- 238000009713 electroplating Methods 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 238000005498 polishing Methods 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims abstract description 6
- 230000003213 activating effect Effects 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims abstract description 6
- 239000007924 injection Substances 0.000 claims abstract description 6
- 239000002699 waste material Substances 0.000 claims abstract description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 20
- 238000007747 plating Methods 0.000 claims description 20
- 238000002425 crystallisation Methods 0.000 claims description 15
- 230000008025 crystallization Effects 0.000 claims description 15
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 229910052759 nickel Inorganic materials 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 5
- XPPKVPWEQAFLFU-UHFFFAOYSA-J diphosphate(4-) Chemical compound [O-]P([O-])(=O)OP([O-])([O-])=O XPPKVPWEQAFLFU-UHFFFAOYSA-J 0.000 claims description 5
- 235000011180 diphosphates Nutrition 0.000 claims description 5
- 238000004381 surface treatment Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 6
- -1 black skin Substances 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910000838 Al alloy Chemical group 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical group [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000011701 zinc Chemical group 0.000 description 4
- 229910001297 Zn alloy Inorganic materials 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
- C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
- C25D5/14—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to the technical field of die-casting metal, in particular to a preparation method of a die-casting piece, aiming at solving the problems of more air holes, bulge or crack of the product and the like, and comprising the following steps: manufacturing a mould; mounting the preheated mould on a casting machine, sealing a pouring gate, and vacuumizing a pouring cavity of the mould through a vacuum valve; casting by adopting a low-pressure slow-injection mold filling mode; after the casting is filled with the mold, feeding and maintaining pressure under the pressurizing condition; opening the mold when the temperature of the casting is kept at 285-300 ℃, then putting the casting into water, discharging water after the temperature of the casting is reduced to 85-100 ℃, and drying the casting; heating the casting to 175-200 ℃ for 7-9 hours to remove the residual stress; standing at room temperature for at least 24 hours; removing a black film and waste residues on the surface layer of the casting through CNC, and then polishing to remove surface flaws; cleaning the surface of the casting, activating by acid, and then carrying out electroplating treatment. The casting prepared by the method has no defects of impurities, black skin, air holes, pressure points and the like, and has popularization significance.
Description
Technical Field
The invention relates to the technical field of die-casting metal, in particular to a preparation method of a die-casting piece.
Background
The die casting is a part which is generally called a die casting, and is a pressure casting mechanical die casting machine which is used for installing a casting die, and copper, zinc, aluminum or aluminum alloy parts with shapes and sizes limited by the die are cast by pouring metal such as copper, zinc, aluminum or aluminum alloy which is heated to be liquid into a feeding port of the die casting machine through die casting of the die casting machine.
Because the metal copper, zinc, aluminum and aluminum alloy have good fluidity and plasticity, and the casting process is carried out in a pressure die casting machine, the aluminum die casting can be made into various complicated shapes and high precision and finish, thereby reducing the machining amount of the casting and the casting allowance of the metal copper, zinc, aluminum or aluminum alloy to a great extent, saving electric power and metal materials, and greatly saving labor cost.
Thus, the main characteristics of die castings are: (1) the product is formed under high pressure, the compactness of the product is high, the mechanical strength and the surface hardness of the product are high, but the elongation of the product is low; (2) the product has the advantages of fast filling, short cooling time, high production efficiency and low cost during batch production; (3) the product has rough surface which can reach Ra1.6-6.3; (4) parts with thinner wall thickness can be produced. However, the rapid forming method with high speed and high pressure is easy to bring many defects because the forming time is too short: the outer metal of product is more compact, and more toward interior, the solidification effect is worse, and it is many that inside is drawn into gas moreover, and the product gas pocket is more, and the inside gas expansion in the die-casting process can lead to the product to appear defects such as swell or split.
Disclosure of Invention
Therefore, the invention aims to provide a die casting preparation method, which solves the problems that the solidification effect is poorer as the metal on the outer layer of a product is denser and goes inwards, more gas is involved in the product, more gas holes are formed in the product, and the product is expanded by the internal gas in the die casting process, so that the product has the defects of bulging or cracking and the like.
The technical purpose of the invention is realized by the following technical scheme:
a die casting preparation method comprises the following steps:
s1, manufacturing a mould, wherein a pouring cavity consistent with the design size of the casting is formed in the mould;
s2, mounting the preheated mold on a casting machine, sealing a pouring gate, and vacuumizing a pouring cavity through a vacuum valve, wherein the vacuum degree of the pouring cavity is less than 90 mbar air pressure;
s3, casting by adopting a low-pressure slow-pouring mold filling mode, closing a vacuum valve after the metal liquid fills the casting cavity of the mold, and stopping vacuumizing operation;
s4, after the casting is completely filled, feeding and maintaining pressure under the pressurizing condition;
s5, opening the mold when the temperature of the casting is kept at 285-300 ℃, then putting the casting into water, discharging water after the temperature of the casting is reduced to 85-100 ℃, and drying the casting;
s6, heating the casting to 175-200 ℃ and maintaining for 7-9 hours to remove the residual stress;
s7, standing for at least 24 hours at room temperature;
s8, removing a black film and waste residues on the surface layer of the casting through CNC, and then polishing to remove surface flaws;
and S9, cleaning the surface of the casting, activating by acid, and then performing electroplating treatment.
Optionally, the inner wall of the mold is provided with an alcohol-based sulfur-blocking coating.
Optionally, the vacuum valve is of a mechanical structure, a hydraulic electromagnetic control valve structure or a cooling exhaust sheet structure.
Optionally, the process parameter of the low-pressure slow-filling mode is that the liquid rising speed is 25-35mm · s-1The filling speed is 30-40 mm.s-1The incrustation pressurizing pressure is 3-5KPa, and the incrustation pressurizing speed is 1-3 KPa.s-1The incrustation time is 4-8s, the crystallization pressurizing pressure is 12-16KPa, and the crystallization pressurizing speed is 1-3 KPa.s-1The crystallization time is 1400-1600s, and the pouring temperature is 650-700 ℃.
Optionally pressurizing to 0.08-0.3MPa, and maintaining the pressure for 1-10 min.
Optionally, blowing the water on the surface layer of the casting by using compressed air, wherein the oil content of the compressed air is less than or equal to 0.1mg/m3The water content is less than or equal to 1000mg/m3。
Optionally, the processing depth of the surface treatment is 0.1-0.15 mm.
Optionally, the electroplating treatment step comprises sequentially carrying out pyrophosphate copper plating, sulfate semi-gloss nickel plating, sulfate gloss nickel plating and decorative chromium plating on the casting.
The invention has the beneficial effects that:
through the processes of mold pretreatment, vacuumizing, low-pressure slow injection mold filling mode, feeding and pressure maintaining, stress removing, CNC shaping and polishing electroplating, the problems that in the prior art, the forming time is too short, the outermost metal of a product is the most compact, the more inward the outermost metal is, the worse the solidification effect is, the larger the stress is, and the defects of air holes/cold materials are serious are solved, so that the processed die-casting metal piece has no defects of impurities, black skin, air holes, pressure points and the like, the surface quality of the casting is greatly improved, the size stability of the casting in the production process is facilitated, the heat treatability and the weldability of the casting are improved, the production efficiency is improved, and the rejection rate is reduced.
Detailed Description
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to examples.
Example 1:
a die casting preparation method comprises the following steps:
s1, manufacturing a mold, wherein a casting cavity consistent with the design size of the casting is formed in the mold, and meanwhile, an alcohol-based sulfur-blocking type coating is coated on the inner wall of the casting cavity to serve as a coating, so that the generation of a flash on the surface of the casting is prevented;
s2, setting the preheating temperature to 300-600 ℃ and the time to 1-5h, preheating the die, then installing the die on a casting machine, sealing a pouring gate, and simultaneously vacuumizing a pouring cavity through a vacuum valve, wherein the vacuum degree is less than 90 mbar air pressure;
the vacuum valve is of a mechanical structure, a hydraulic electromagnetic control valve structure or a cooling exhaust piece structure, the vacuum valve is selected specifically, the vacuum valve is preferably of the electromagnetic control valve structure according to the requirement of an equipment interface on the quality of a casting, and the vacuum valve has the advantages of large exhaust capacity and strong pollution resistance;
in addition, the following conditions are required to control the vacuum degree to be less than 90 mbar air pressure: the equipment has good connection and sealing performance, and reduces air leakage; excessive release agent cannot be sprayed, so that the situation that moisture is remained in a pouring cavity and the situation that the residual is accumulated in an exhaust passage to influence the action of a vacuum valve is avoided; selecting a connecting rod pulse type spraying mode; configuring a high-capacity vacuum pump and a vacuum tank;
s3, casting the large thick-wall slab casting by adopting a low-pressure slow-injection mold filling mode, wherein the process parameters comprise the liquid raising speed of 25mm & S-1The filling speed is 30mm s-1The incrustation boost pressure is 3KPa, and the incrustation boost speed is 1 KPa.s-1The incrustation time is8s, a crystallization pressurization pressure of 12KPa, and a crystallization pressurization speed of 1KPa s-1The crystallization time is 1600s, the pouring temperature is 650 ℃, after the metal liquid is filled in the pouring cavity of the mold, the vacuum valve is closed, and the vacuumizing operation is stopped;
s4, after the casting is completely filled, feeding and maintaining pressure under the pressurizing condition, wherein the pressure is 0.08MPa, and then the pressure is maintained for 10 minutes;
s5, opening the die when the temperature of the casting is kept at 285 ℃, then putting the casting into water, discharging the water after the temperature of the casting is reduced to 85 ℃, and drying the water on the surface layer of the casting by using compressed air, wherein the oil content of the compressed air is less than or equal to 0.1mg/m3The water content is less than or equal to 1000mg/m3；
S6, heating the casting to 200 ℃ and maintaining for 7 hours to remove the residual stress;
s7, standing for at least 24 hours at room temperature;
s8, removing black films and waste residues on the surface layer of the casting through CNC, and then polishing, wherein the processing depth of the surface layer treatment is 0.15mm to remove surface flaws;
s9, cleaning the surface of the casting, activating with acid, and then performing electroplating treatment;
the electroplating treatment comprises the steps of sequentially carrying out pyrophosphate copper plating, sulfate semi-gloss nickel plating, sulfate gloss nickel plating and decorative chromium plating on the casting, and is suitable for zinc alloy die castings.
Example 2:
a die casting preparation method comprises the following steps:
s1, manufacturing a mold, wherein a casting cavity consistent with the design size of the casting is formed in the mold, and meanwhile, an alcohol-based sulfur-blocking type coating is coated on the inner wall of the casting cavity to serve as a coating, so that the generation of a flash on the surface of the casting is prevented;
s2, setting the preheating temperature to 300-600 ℃ and the time to 1-5h, preheating the die, then installing the die on a casting machine, sealing a pouring gate, and simultaneously vacuumizing a pouring cavity through a vacuum valve, wherein the vacuum degree is less than 90 mbar air pressure;
the vacuum valve is of a mechanical structure, a hydraulic electromagnetic control valve structure or a cooling exhaust piece structure, the vacuum valve is selected specifically, the vacuum valve is preferably of the electromagnetic control valve structure according to the requirement of an equipment interface on the quality of a casting, and the vacuum valve has the advantages of large exhaust capacity and strong pollution resistance;
in addition, the following conditions are required to control the vacuum degree to be less than 90 mbar air pressure: the equipment has good connection and sealing performance, and reduces air leakage; excessive release agent cannot be sprayed, so that the situation that moisture is remained in a pouring cavity and the situation that the residual is accumulated in an exhaust passage to influence the action of a vacuum valve is avoided; selecting a connecting rod pulse type spraying mode; configuring a high-capacity vacuum pump and a vacuum tank;
s3, casting the large thick-wall slab casting by adopting a low-pressure slow-injection mold filling mode, wherein the process parameters comprise the liquid raising speed of 35mm & S-1The filling speed is 40mm s-1The incrustation boost pressure is 5KPa, and the incrustation boost speed is 3 KPa.s-1The incrustation time is 4s, the crystallization pressurization pressure is 16KPa, and the crystallization pressurization speed is 3 KPa.s-1The crystallization time is 1400s, the pouring temperature is 700 ℃, after the metal liquid is filled in the pouring cavity of the mold, the vacuum valve is closed, and the vacuumizing operation is stopped;
s4, after the casting is completely filled, feeding and maintaining pressure under the pressurizing condition, wherein the pressure is 0.3MPa, and then the pressure is maintained for 1 minute;
s5, opening the die when the temperature of the casting is kept at 285 ℃, then putting the casting into water, discharging the water after the temperature of the casting is reduced to 85 ℃, and drying the water on the surface layer of the casting by using compressed air, wherein the oil content of the compressed air is less than or equal to 0.1mg/m3The water content is less than or equal to 1000mg/m3；
S6, heating the casting to 175 ℃ and maintaining for 9 hours to remove the residual stress;
s7, standing for at least 24 hours at room temperature;
s8, removing black films and waste residues on the surface layer of the casting through CNC, and then polishing, wherein the processing depth of the surface layer treatment is 0.12mm to remove surface flaws;
s9, cleaning the surface of the casting, activating with acid, and then performing electroplating treatment;
the electroplating treatment comprises the steps of sequentially carrying out pyrophosphate copper plating, sulfate semi-gloss nickel plating, sulfate gloss nickel plating and decorative chromium plating on the casting, and is suitable for zinc alloy die castings.
Example 3:
a die casting preparation method comprises the following steps:
s1, manufacturing a mold, wherein a casting cavity consistent with the design size of the casting is formed in the mold, and meanwhile, an alcohol-based sulfur-blocking type coating is coated on the inner wall of the casting cavity to serve as a coating, so that the generation of a flash on the surface of the casting is prevented;
s2, setting the preheating temperature to 300-600 ℃ and the time to 1-5h, preheating the die, then installing the die on a casting machine, sealing a pouring gate, and simultaneously vacuumizing a pouring cavity through a vacuum valve, wherein the vacuum degree is less than 90 mbar air pressure;
the vacuum valve is of a mechanical structure, a hydraulic electromagnetic control valve structure or a cooling exhaust piece structure, the vacuum valve is selected specifically, the vacuum valve is preferably of the electromagnetic control valve structure according to the requirement of an equipment interface on the quality of a casting, and the vacuum valve has the advantages of large exhaust capacity and strong pollution resistance;
in addition, the following conditions are required to control the vacuum degree to be less than 90 mbar air pressure: the equipment has good connection and sealing performance, and reduces air leakage; excessive release agent cannot be sprayed, so that the situation that moisture is remained in a pouring cavity and the situation that the residual is accumulated in an exhaust passage to influence the action of a vacuum valve is avoided; selecting a connecting rod pulse type spraying mode; configuring a high-capacity vacuum pump and a vacuum tank;
s3, casting the large thick-wall slab casting by adopting a low-pressure slow-injection mold filling mode, wherein the process parameters comprise the liquid raising speed of 30mm & S-1The filling speed is 35mm s-1The incrustation boost pressure is 4KPa, and the incrustation boost speed is 2 KPa.s-1The incrustation time is 6s, the crystallization pressurization pressure is 15KPa, and the crystallization pressurization speed is 2 KPa.s-1The crystallization time is 1500s, the pouring temperature is 680 ℃, after the metal liquid is filled in the pouring cavity of the mold, the vacuum valve is closed, and the vacuumizing operation is stopped;
s4, after the casting is completely filled, feeding and maintaining pressure under the pressurizing condition, wherein the pressure is 0.12MPa, and then the pressure is maintained for 3 minutes;
s5, opening the die when the temperature of the casting is kept at 290 ℃, then putting the die into water, discharging water after the temperature of the casting is reduced to 90 ℃, and drying the water on the surface layer of the casting by using compressed air, wherein the oil content of the compressed air is less than or equal to 0.1mg/m3The water content is less than or equal to 1000mg/m3；
S6, heating the casting to 185 ℃ and maintaining for 8 hours to remove the residual stress;
s7, standing for at least 24 hours at room temperature;
s8, removing black films and waste residues on the surface layer of the casting through CNC, and then polishing, wherein the processing depth of the surface layer treatment is 0.1mm to remove surface flaws;
s9, cleaning the surface of the casting, activating with acid, and then performing electroplating treatment;
the electroplating treatment comprises the steps of sequentially carrying out pyrophosphate copper plating, sulfate semi-gloss nickel plating, sulfate gloss nickel plating and decorative chromium plating on the casting, and is suitable for zinc alloy die castings.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. A die casting preparation method is characterized by comprising the following steps:
s1, manufacturing a mould, wherein a pouring cavity consistent with the design size of the casting is formed in the mould;
s2, mounting the preheated mold on a casting machine, sealing a pouring gate, and vacuumizing a pouring cavity through a vacuum valve, wherein the vacuum degree of the pouring cavity is less than 90 mbar air pressure;
s3, casting by adopting a low-pressure slow-pouring mold filling mode, closing a vacuum valve after the metal liquid fills the casting cavity of the mold, and stopping vacuumizing operation;
s4, after the casting is completely filled, feeding and maintaining pressure under the pressurizing condition;
s5, opening the mold when the temperature of the casting is kept at 285-300 ℃, then putting the casting into water, discharging water after the temperature of the casting is reduced to 85-100 ℃, and drying the casting;
s6, heating the casting to 175-200 ℃ and maintaining for 7-9 hours to remove the residual stress;
s7, standing for at least 24 hours at room temperature;
s8, removing a black film and waste residues on the surface layer of the casting through CNC, and then polishing to remove surface flaws;
and S9, cleaning the surface of the casting, activating by acid, and then performing electroplating treatment.
2. The die casting manufacturing method according to claim 1, wherein in step S1, the inner wall of the mold is provided with an alcohol-based sulfur-blocking type coating.
3. The die casting manufacturing method according to claim 1, wherein in step S2, the vacuum valve is of a mechanical type structure, a hydraulic type solenoid-operated valve structure, or a cooling exhaust fin structure.
4. The die casting manufacturing method of claim 1, wherein in the step S3, the process parameters of the low-pressure slow-injection filling mode comprise a liquid-lifting speed of 25-35 mm-S-1The filling speed is 30-40 mm.s-1The incrustation pressurizing pressure is 3-5KPa, and the incrustation pressurizing speed is 1-3 KPa.s-1The incrustation time is 4-8s, the crystallization pressurizing pressure is 12-16KPa, and the crystallization pressurizing speed is 1-3 KPa.s-1The crystallization time is 1400-1600s, and the pouring temperature is 650-700 ℃.
5. The die casting manufacturing method according to claim 1, wherein in step S4, the pressure is increased to 0.08 to 0.3MPa, and then the pressure is maintained for 1 to 10 min.
6. The method of claim 1, wherein in step S5, the water on the surface of the casting is blown dry by compressed air, and the oil content of the compressed air is less than or equal to 0.1mg/m3The water content is less than or equal to 1000mg/m3。
7. The die casting manufacturing method according to claim 1, wherein in step S8, the processing depth of the surface treatment is 0.1 to 0.15 mm.
8. The die casting manufacturing method according to claim 1, wherein in step S9, the electroplating treatment step includes sequentially performing pyrophosphate copper plating, sulfate semi-gloss nickel plating, sulfate gloss nickel plating, and decorative chromium plating on the casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110474520.6A CN113369460A (en) | 2021-04-29 | 2021-04-29 | Die casting preparation method |
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|---|---|---|---|
| CN202110474520.6A CN113369460A (en) | 2021-04-29 | 2021-04-29 | Die casting preparation method |
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| CN113369460A true CN113369460A (en) | 2021-09-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114147185A (en) * | 2021-11-15 | 2022-03-08 | 无锡蓝豹科技有限公司 | Manufacturing process of rear clothes rack of electric vehicle |
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