CN112030209B - Multicolor oxidation process for aluminum die casting - Google Patents

Multicolor oxidation process for aluminum die casting Download PDF

Info

Publication number
CN112030209B
CN112030209B CN202010422385.6A CN202010422385A CN112030209B CN 112030209 B CN112030209 B CN 112030209B CN 202010422385 A CN202010422385 A CN 202010422385A CN 112030209 B CN112030209 B CN 112030209B
Authority
CN
China
Prior art keywords
aluminum
die casting
aluminum die
color
casting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010422385.6A
Other languages
Chinese (zh)
Other versions
CN112030209A (en
Inventor
张红波
毛飞熊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nantong Woteli Machinery Manufacturing Co ltd
Original Assignee
Nantong Woteli Machinery Manufacturing Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nantong Woteli Machinery Manufacturing Co ltd filed Critical Nantong Woteli Machinery Manufacturing Co ltd
Priority to CN202010422385.6A priority Critical patent/CN112030209B/en
Publication of CN112030209A publication Critical patent/CN112030209A/en
Application granted granted Critical
Publication of CN112030209B publication Critical patent/CN112030209B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02Anodisation
    • C25D11/04Anodisation of aluminium or alloys based thereon
    • C25D11/12Anodising more than once, e.g. in different baths
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00Treatment of fused masses in the ladle or the supply runners before casting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00Pressure casting; Vacuum casting
    • B22D18/02Pressure casting making use of mechanical pressure devices, e.g. cast-forging
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/15Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using vacuum
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D43/00Mechanical cleaning, e.g. skimming of molten metals
    • B22D43/001Retaining slag during pouring molten metal
    • B22D43/004Retaining slag during pouring molten metal by using filtering means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02Anodisation
    • C25D11/04Anodisation of aluminium or alloys based thereon
    • C25D11/14Producing integrally coloured layers
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02Anodisation
    • C25D11/04Anodisation of aluminium or alloys based thereon
    • C25D11/16Pretreatment, e.g. desmutting

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

The invention relates to a multicolor oxidation process for aluminum die castings, which comprises the following steps: s1, preheating a smelting furnace; s2, melting the molten material; s3, spraying granular aluminum alloy flux; s4, filtering the aluminum liquid; s5, vacuum die-casting and forming; s6, highlight soaking treatment; s7, drilling; s8, sand blasting; s9, drawing; s10, milling a C angle; s11, carrying out color oxidation; s12, milling a high-brightness surface; s13, dichroic oxidation. The invention has the following advantages: and the mechanical property and the structural strength of the prepared aluminum die casting are ensured.

Description

Multicolor oxidation process for aluminum die casting
The technical field is as follows:
the invention relates to the field of aluminum die casting oxidation, in particular to a multicolor oxidation process for an aluminum die casting.
Background art:
the die casting process principle is that molten metal is pressed into a cavity of a precise metal die at high speed by utilizing high pressure, the molten metal is cooled and solidified under the action of pressure to form a casting, the die casting production efficiency is high, and the die casting with complex shape, accurate size, clear outline, high surface quality, high strength and high hardness can be die cast, so the die casting has wide application and rapid development, and the aluminum die casting has good service performance and process performance, so the die casting develops rapidly, is widely applied in various industrial departments, and occupies an extremely important position in the die casting production.
The production process of the aluminum die casting has the following defects: 1. for an aluminum die casting with a special structure, at present, the aluminum die casting is subjected to die casting, oxidation coloring and then surface treatment such as drilling, chamfering and the like, and a workpiece is subjected to procedures such as deburring, so that the surface quality and the mechanical property of the workpiece are damaged; 2. when the aluminum die casting piece is subjected to die casting again, the die casting liquid can generate separation or vortex, and the phenomenon that the vortex of the die casting liquid covers air is generated, so that more air bubbles are easily generated in the die casting forming process of the die casting liquid, the quantity of the air bubbles is large and irregularly distributed, the surface quality and the mechanical property of the aluminum die casting piece in later-stage coloring oxidation are influenced, the tensile strength can only reach 180MPa at most, and the elongation of the aluminum die casting piece reaches 1.55 percent at most.
The invention content is as follows:
the invention aims to overcome the defects and provide a multicolor oxidation process for aluminum die castings, so that the mechanical property and the structural strength of the prepared aluminum die castings are ensured.
The purpose of the invention is realized by the following technical scheme: a multicolor oxidation process for aluminum die castings, comprising:
s1, preheating the smelting furnace, drying the side wall of the smelting furnace for 24-30 h at 60-80 ℃, and preheating the inner wall of the smelting furnace to 230 ℃;
s2, melting, namely putting aluminum or aluminum alloy into a melting furnace for melting, and when discharging, putting a small-volume aluminum material into the melting furnace for bottom filling, and then putting a large-volume aluminum material for melting to form aluminum liquid;
s3, spraying granular aluminum alloy flux, and spraying the aluminum alloy flux on the upper end surface of the aluminum liquid at a constant speed in a reciprocating manner, wherein the granular aluminum alloy flux covers the aluminum liquid surface;
s4, filtering the aluminum liquid, and preheating a filter screen before filtering, wherein the preheating temperature is 60-70 ℃;
s5, carrying out vacuum die-casting molding, namely preheating an upper die and a lower die of a die-casting machine respectively, pouring filtered aluminum liquid into the lower die, and carrying out punch forming under the stamping pressure of 10-30 tons to form a first aluminum die-casting piece;
s6, highlight soaking, namely soaking the first aluminum die casting formed by die casting in a mixed solution of sodium hydroxide and sulfuric acid, and then soaking in hot water at the temperature of 80-90 ℃ to form a highlight surface on the surface of the first aluminum die casting and form a second aluminum die casting;
s7, drilling, namely drilling the second aluminum die casting through drilling equipment, and then cleaning and drying to ensure that no burrs exist in the holes;
s8, performing sand blasting, namely performing sand blasting treatment on the outer surface of the second aluminum die casting prepared in the step S7, wherein the mesh number of glass sand is 160-180 meshes, and the spraying pressure is 0.4-0.6 MPa;
s9, wire drawing, wherein wire drawing treatment is carried out on the surface of the second aluminum die casting subjected to sand blasting through a wire drawing machine, the rotating speed of the wire drawing machine is 1450 and 1500 turns, the mesh number of abrasive belts is 180 and 200 meshes, soap is coated on the abrasive belts, and the wire drawing direction of the abrasive belts is parallel to that of the second aluminum die casting;
s10, milling a C angle, wherein an angle milling machine is adopted to mill the angle, the C angle is converted into an arc for transition, the side line of the C angle is parallel to the second aluminum die casting, and then surface cutting fluid is cleaned and dried;
s11, oxidizing in one color, namely obliquely placing a second aluminum die casting into a coloring bath solution and shaking at a constant speed to ensure that the second aluminum die casting is in full contact with the coloring bath solution, wherein the concentration of the coloring bath solution reaches 150-160 g/L, the control voltage is 58-60V, the peak current density is 1A/d square meter, the coloring time is 5-10min, and the cycle time from the step S9 of wire drawing to the step S11 of oxidizing in one color is within 48 h;
s12, milling a highlight surface, milling the highlight surface of the second aluminum die casting after the one-color oxidation by adopting a diamond chamfering highlight cutter, cleaning the surface and drying;
s13, performing dichromatic oxidation, namely obliquely placing a second aluminum die casting into coloring bath solution for secondary oxidation coloring and shaking at a constant speed, wherein the second aluminum die casting is in full contact with the coloring bath solution, the concentration of the coloring bath solution reaches 150-160 g/L, the control voltage is 58-60V, the peak current density is 1A/d square meter, the coloring time is 2-6min, and the finished product of the aluminum die casting is obtained, wherein the tensile strength of the aluminum die casting is 258-298MPa, and the elongation is 2.35-2.85%.
The invention is further improved in that: in the one-color oxidation in the step S11 and the two-color oxidation in the step S13, the coloring bath solution is drained after coloring, the second aluminum die casting is transferred to a water bath to be washed with water, if the color is lighter than the required color, the second aluminum die casting is placed in the coloring bath solution again to perform color compensation, and if the color is darker than the required color, the second aluminum die casting is placed in an acid water bath to perform color fading treatment.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the aluminum die casting is firstly pressed and formed, drilling is carried out after highlight treatment, the highlight treatment enables the surface smoothness of the aluminum die casting to be high, the quantity and the volume of burrs are greatly reduced, cleaning is convenient, C angles are milled after sand blasting and wire drawing, then oxidation is carried out, oxidation not only has the function of convenient coloring, but also can rapidly remove a small amount of small burrs generated by milling the C angles, and then highlight surface milling and bicolor oxidation are carried out, so that the aluminum die casting is prepared, the surface quality is high, the structural strength is not influenced, and the surface quality and the structural strength of the aluminum die casting are prevented from being influenced by re-drilling and corner milling deburring after oxidation.
2. The effect of going out the gas pocket is reached in the mode that loops through spraying granule flux, filtering aluminium liquid and vacuum pressing, and granule flux plays and gets rid of the effect of inclusion sediment thing in the aluminium liquid and reducing the displacement, filters aluminium liquid and plays and further gets rid of inclusion sediment thing, reduces the effect of gas pocket, and vacuum pressing makes the hole appearance round and regular, and the distribution is even, further improves the mechanical properties of aluminium die casting.
The specific implementation mode is as follows:
for the purpose of enhancing understanding of the present invention, the present invention will be further described in detail with reference to the following examples, which are provided for illustration only and are not to be construed as limiting the scope of the present invention.
A multicolor oxidation process for aluminum die castings, comprising:
s1, preheating the smelting furnace, drying the side wall of the smelting furnace for 24-30 h at 60-80 ℃, and preheating the inner wall of the smelting furnace to 230 ℃;
s2, melting, namely putting aluminum or aluminum alloy into a melting furnace for melting, and when discharging, putting a small-volume aluminum material into the melting furnace for bottom filling, and then putting a large-volume aluminum material for melting to form aluminum liquid;
s3, spraying granular aluminum alloy flux, and spraying the aluminum alloy flux on the upper end surface of the aluminum liquid at a constant speed in a reciprocating manner, wherein the granular aluminum alloy flux covers the aluminum liquid surface;
s4, filtering the aluminum liquid, and preheating a filter screen before filtering, wherein the preheating temperature is 60-70 ℃;
s5, carrying out vacuum die-casting molding, namely preheating an upper die and a lower die of a die-casting machine respectively, pouring filtered aluminum liquid into the lower die, and carrying out punch forming under the stamping pressure of 10-30 tons to form a first aluminum die-casting piece;
s6, highlight soaking, namely soaking the first aluminum die casting formed by die casting in a mixed solution of sodium hydroxide and sulfuric acid, and then soaking in hot water at the temperature of 80-90 ℃ to form a highlight surface on the surface of the first aluminum die casting and form a second aluminum die casting;
s7, drilling, namely drilling the second aluminum die casting through drilling equipment, and then cleaning and drying to ensure that no burrs exist in the holes;
s8, performing sand blasting, namely performing sand blasting treatment on the outer surface of the second aluminum die casting prepared in the step S7, wherein the mesh number of glass sand is 160-180 meshes, and the spraying pressure is 0.4-0.6 MPa;
s9, wire drawing, wherein wire drawing treatment is carried out on the surface of the second aluminum die casting subjected to sand blasting through a wire drawing machine, the rotating speed of the wire drawing machine is 1450 and 1500 turns, the mesh number of abrasive belts is 180 and 200 meshes, soap is coated on the abrasive belts, and the wire drawing direction of the abrasive belts is parallel to that of the second aluminum die casting;
s10, milling a C angle, wherein an angle milling machine is adopted to mill the angle, the C angle is converted into an arc for transition, the side line of the C angle is parallel to the second aluminum die casting, and then surface cutting fluid is cleaned and dried;
s11, oxidizing in one color, namely obliquely placing a second aluminum die casting into a coloring bath solution and shaking at a constant speed to ensure that the second aluminum die casting is in full contact with the coloring bath solution, wherein the concentration of the coloring bath solution reaches 150-160 g/L, the control voltage is 58-60V, the peak current density is 1A/d square meter, the coloring time is 5-10min, and the cycle time from the step S9 of wire drawing to the step S11 of oxidizing in one color is within 48 h;
s12, milling a highlight surface, milling the highlight surface of the second aluminum die casting after the one-color oxidation by adopting a diamond chamfering highlight cutter, cleaning the surface and drying;
s13, performing dichromatic oxidation, namely obliquely placing a second aluminum die casting into coloring bath solution for secondary oxidation coloring and shaking at a constant speed, wherein the second aluminum die casting is in full contact with the coloring bath solution, the concentration of the coloring bath solution reaches 150-160 g/L, the control voltage is 58-60V, the peak current density is 1A/d square meter, the coloring time is 2-6min, and the finished product of the aluminum die casting is obtained, wherein the tensile strength of the aluminum die casting is 258-298MPa, and the elongation is 2.35-2.85%.
Further, in the one-color oxidation in step S11 and the two-color oxidation in step S13, after coloring, the coloring bath solution is drained, the second aluminum die casting is transferred to a water bath and washed with water, and if the color is lighter than the required color, the second aluminum die casting is placed in the coloring bath solution again for color compensation, and if the color is darker than the required color, the second aluminum die casting is placed in an acid water bath for color fading.
Example 1
A multicolor oxidation process for aluminum die castings, comprising:
s1, preheating a smelting furnace, drying the side wall of the smelting furnace for 24 hours at the temperature of 60 ℃, and preheating the inner wall of the smelting furnace to 210 ℃;
s2, melting, namely putting aluminum or aluminum alloy into a melting furnace for melting, and when discharging, putting a small-volume aluminum material into the melting furnace for bottom filling, and then putting a large-volume aluminum material for melting to form aluminum liquid;
s3, spraying granular aluminum alloy flux, and spraying the aluminum alloy flux on the upper end surface of the aluminum liquid at a constant speed in a reciprocating manner, wherein the granular aluminum alloy flux covers the aluminum liquid surface;
s4, filtering the aluminum liquid, and preheating a filter screen before filtering, wherein the preheating temperature is 60 ℃;
s5, carrying out vacuum die-casting molding, namely preheating an upper die and a lower die of a die-casting machine respectively, pouring filtered aluminum liquid into the lower die, and carrying out punch forming under the stamping pressure of 10 tons to form a first aluminum die-casting piece;
s6, highlight soaking, namely soaking the first aluminum die casting formed by die casting in a mixed solution of sodium hydroxide and sulfuric acid, and then soaking in hot water at 80 ℃ to form a highlight surface on the surface of the first aluminum die casting and form a second aluminum die casting;
s7, drilling, namely drilling the second aluminum die casting through drilling equipment, and then cleaning and drying to ensure that no burrs exist in the holes;
s8, performing sand blasting, namely performing sand blasting treatment on the outer surface of the second aluminum die casting prepared in the step S7, wherein the mesh number of glass sand is 160 meshes, and the spraying pressure is 0.4 MPa;
s9, wire drawing, wherein wire drawing treatment is carried out on the surface of the second aluminum die casting subjected to sand blasting through a wire drawing machine, the rotating speed of the wire drawing machine is 1450 revolutions, the mesh number of abrasive belts is 180 meshes, soap is coated on the abrasive belts, and the wire drawing direction of the abrasive belts is parallel to the wire drawing direction of the second aluminum die casting;
s10, milling a C angle, wherein an angle milling machine is adopted to mill the angle, the C angle is converted into an arc for transition, the side line of the C angle is parallel to the second aluminum die casting, and then surface cutting fluid is cleaned and dried;
s11, oxidizing in one color, namely obliquely placing a second aluminum die casting into a coloring bath solution and shaking at a constant speed to ensure that the second aluminum die casting is in full contact with the coloring bath solution, wherein the concentration of the coloring bath solution reaches 150g/L, the control voltage is 58V, the peak current density is 1A/d square meter, the coloring time is 5min, and the cycle time from the step S9 of wire drawing to the step S11 of oxidizing in one color is within 48 h;
s12, milling a highlight surface, milling the highlight surface of the second aluminum die casting after the one-color oxidation by adopting a diamond chamfering highlight cutter, cleaning the surface and drying;
and S13, performing dichromatic oxidation, namely obliquely placing a second aluminum die casting into coloring bath solution for secondary oxidation coloring and shaking at a constant speed, wherein the second aluminum die casting is in full contact with the coloring bath solution, the concentration of the coloring bath solution reaches 150g/L, the control voltage is 58V, the peak current density is 1A/d square meter, the coloring time is 2min, and the finished aluminum die casting is obtained, wherein the tensile strength of the aluminum die casting is 268MPa, and the elongation is 2.43%.
According to the invention, the aluminum die casting is firstly pressed and formed, drilling is carried out after highlight treatment, the highlight treatment enables the surface smoothness of the aluminum die casting to be high, the quantity and the volume of burrs are greatly reduced, cleaning is convenient, C angles are milled after sand blasting and wire drawing, then oxidation is carried out, oxidation not only has the function of convenient coloring, but also can rapidly remove a small amount of small burrs generated by milling the C angles, and then highlight surface milling and bicolor oxidation are carried out, so that the aluminum die casting is prepared, the surface quality is high, the structural strength is not influenced, and the surface quality and the structural strength of the aluminum die casting are prevented from being influenced by re-drilling and corner milling deburring after oxidation.
The effect of going out the gas pocket is reached in the mode that loops through spraying granule flux, filtering aluminium liquid and vacuum pressing, and granule flux plays and gets rid of the effect of inclusion sediment thing in the aluminium liquid and reducing the displacement, filters aluminium liquid and plays and further gets rid of inclusion sediment thing, reduces the effect of gas pocket, and vacuum pressing makes the hole appearance round and regular, and the distribution is even, further improves the mechanical properties of aluminium die casting.
Example 2
A multicolor oxidation process for aluminum die castings, comprising:
s1, preheating a smelting furnace, drying the side wall of the smelting furnace for 26h at 70 ℃, and preheating the inner wall of the smelting furnace to 220 ℃;
s2, melting, namely putting aluminum or aluminum alloy into a melting furnace for melting, and when discharging, putting a small-volume aluminum material into the melting furnace for bottom filling, and then putting a large-volume aluminum material for melting to form aluminum liquid;
s3, spraying granular aluminum alloy flux, and spraying the aluminum alloy flux on the upper end surface of the aluminum liquid at a constant speed in a reciprocating manner, wherein the granular aluminum alloy flux covers the aluminum liquid surface;
s4, filtering the aluminum liquid, and preheating a filter screen before filtering, wherein the preheating temperature is 65 ℃;
s5, carrying out vacuum die-casting molding, namely preheating an upper die and a lower die of a die-casting machine respectively, pouring filtered aluminum liquid into the lower die, and carrying out punch forming under the stamping pressure of 20 tons to form a first aluminum die-casting piece;
s6, highlight soaking, namely soaking the first aluminum die casting formed by die casting in a mixed solution of sodium hydroxide and sulfuric acid, and then soaking in hot water at 85 ℃ to form a highlight surface on the surface of the first aluminum die casting and form a second aluminum die casting;
s7, drilling, namely drilling the second aluminum die casting through drilling equipment, and then cleaning and drying to ensure that no burrs exist in the holes;
s8, performing sand blasting, namely performing sand blasting treatment on the outer surface of the second aluminum die casting prepared in the step S7, wherein the mesh number of glass sand is 170 meshes, and the spraying pressure is 0.5 MPa;
s9, wire drawing, wherein wire drawing treatment is carried out on the surface of the second aluminum die casting after sand blasting through a wire drawing machine, the rotating speed of the wire drawing machine is 1480 revolutions, the mesh number of abrasive belts is 190 meshes, soap is coated on the abrasive belts, and the wire drawing direction of the abrasive belts is parallel to the wire drawing direction of the second aluminum die casting;
s10, milling a C angle, wherein an angle milling machine is adopted to mill the angle, the C angle is converted into an arc for transition, the side line of the C angle is parallel to the second aluminum die casting, and then surface cutting fluid is cleaned and dried;
s11, oxidizing in one color, namely obliquely placing a second aluminum die casting into a coloring bath solution and shaking at a constant speed to ensure that the second aluminum die casting is in full contact with the coloring bath solution, wherein the concentration of the coloring bath solution reaches 155g/L, the control voltage is 58V, the peak current density is 1A/d square meter, the coloring time is 8min, and the cycle time from the step S9 of wire drawing to the step S11 of oxidizing in one color is within 48 h;
s12, milling a highlight surface, milling the highlight surface of the second aluminum die casting after the one-color oxidation by adopting a diamond chamfering highlight cutter, cleaning the surface and drying;
and S13, performing dichromatic oxidation, namely obliquely placing a second aluminum die casting into coloring bath solution for secondary oxidation coloring and shaking at a constant speed, wherein the second aluminum die casting is in full contact with the coloring bath solution, the concentration of the coloring bath solution reaches 155g/L, the control voltage is 58V, the peak current density is 1A/d square meter, the coloring time is 4min, and the finished aluminum die casting is obtained, wherein the tensile strength of the aluminum die casting is 258MPa, and the elongation is 2.35%.
Example 3
A multicolor oxidation process for aluminum die castings, comprising:
s1, preheating a smelting furnace, drying the side wall of the smelting furnace for 30h at 80 ℃, and preheating the inner wall of the smelting furnace to 230 ℃;
s2, melting, namely putting aluminum or aluminum alloy into a melting furnace for melting, and when discharging, putting a small-volume aluminum material into the melting furnace for bottom filling, and then putting a large-volume aluminum material for melting to form aluminum liquid;
s3, spraying granular aluminum alloy flux, and spraying the aluminum alloy flux on the upper end surface of the aluminum liquid at a constant speed in a reciprocating manner, wherein the granular aluminum alloy flux covers the aluminum liquid surface;
s4, filtering the aluminum liquid, and preheating a filter screen before filtering, wherein the preheating temperature is 70 ℃;
s5, carrying out vacuum die-casting molding, namely preheating an upper die and a lower die of a die-casting machine respectively, pouring filtered aluminum liquid into the lower die, and carrying out punch forming under the stamping pressure of 30 tons to form a first aluminum die-casting piece;
s6, highlight soaking, namely soaking the first aluminum die casting formed by die casting in a mixed solution of sodium hydroxide and sulfuric acid, and then soaking in hot water at 90 ℃ to form a highlight surface on the surface of the first aluminum die casting and form a second aluminum die casting;
s7, drilling, namely drilling the second aluminum die casting through drilling equipment, and then cleaning and drying to ensure that no burrs exist in the holes;
s8, performing sand blasting, namely performing sand blasting treatment on the outer surface of the second aluminum die casting prepared in the step S7, wherein the mesh number of glass sand is 180 meshes, and the spraying pressure is 0.6 MPa;
s9, wire drawing, wherein wire drawing treatment is carried out on the surface of the second aluminum die casting after sand blasting through a wire drawing machine, the rotating speed of the wire drawing machine is 1500 turns, the mesh number of abrasive belts is 200 meshes, soap is coated on the abrasive belts, and the wire drawing direction of the abrasive belts is parallel to the wire drawing direction of the second aluminum die casting;
s10, milling a C angle, wherein an angle milling machine is adopted to mill the angle, the C angle is converted into an arc for transition, the side line of the C angle is parallel to the second aluminum die casting, and then surface cutting fluid is cleaned and dried;
s11, oxidizing in one color, namely obliquely placing a second aluminum die casting into a coloring bath solution and shaking at a constant speed to ensure that the second aluminum die casting is in full contact with the coloring bath solution, wherein the concentration of the coloring bath solution reaches 160g/L, the control voltage is 60V, the peak current density is 1A/d square meter, the coloring time is 10min, and the cycle time from the step S9 of wire drawing to the step S11 of oxidizing in one color is within 48 h;
s12, milling a highlight surface, milling the highlight surface of the second aluminum die casting after the one-color oxidation by adopting a diamond chamfering highlight cutter, cleaning the surface and drying;
and S13, performing dichromatic oxidation, namely obliquely placing a second aluminum die casting into coloring bath solution for secondary oxidation coloring and shaking at a constant speed, wherein the second aluminum die casting is fully contacted with the coloring bath solution, the concentration of the coloring bath solution reaches 160g/L, the control voltage is 60V, the peak current density is 1A/d square meter, the coloring time is 6min, and the finished aluminum die casting is obtained, wherein the tensile strength of the aluminum die casting is 298MPa, and the elongation is 2.85%.
Therefore, example 3 is the best example, and realizes good surface quality and high structural strength of the aluminum die casting.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (2)

1. A multicolor oxidation process for aluminum die castings, comprising:
s1, preheating the smelting furnace, drying the side wall of the smelting furnace for 24-30 h at 60-80 ℃, and preheating the inner wall of the smelting furnace to 230 ℃;
s2, melting, namely putting aluminum or aluminum alloy into a melting furnace for melting, and when discharging, putting a small-volume aluminum material into the melting furnace for bottom filling, and then putting a large-volume aluminum material for melting to form aluminum liquid;
s3, spraying granular aluminum alloy flux, and spraying the aluminum alloy flux on the upper end surface of the aluminum liquid at a constant speed in a reciprocating manner, wherein the granular aluminum alloy flux covers the aluminum liquid surface;
s4, filtering the aluminum liquid, and preheating a filter screen before filtering, wherein the preheating temperature is 60-70 ℃;
s5, carrying out vacuum die-casting molding, namely preheating an upper die and a lower die of a die-casting machine respectively, pouring filtered aluminum liquid into the lower die, and carrying out punch forming under the stamping pressure of 10-30 tons to form a first aluminum die-casting piece;
s6, highlight soaking, namely soaking the first aluminum die casting formed by die casting in a mixed solution of sodium hydroxide and sulfuric acid, and then soaking in hot water at the temperature of 80-90 ℃ to form a highlight surface on the surface of the first aluminum die casting and form a second aluminum die casting;
s7, drilling, namely drilling the second aluminum die casting through drilling equipment, and then cleaning and drying to ensure that no burrs exist in the holes;
s8, performing sand blasting, namely performing sand blasting treatment on the outer surface of the second aluminum die casting prepared in the step S7, wherein the mesh number of glass sand is 160-180 meshes, and the spraying pressure is 0.4-0.6 MPa;
s9, wire drawing, wherein wire drawing treatment is carried out on the surface of the second aluminum die casting subjected to sand blasting through a wire drawing machine, the rotating speed of the wire drawing machine is 1450 and 1500 turns, the mesh number of abrasive belts is 180 and 200 meshes, soap is coated on the abrasive belts, and the wire drawing direction of the abrasive belts is parallel to that of the second aluminum die casting;
s10, milling a C angle, wherein an angle milling machine is adopted to mill the angle, the C angle is converted into an arc for transition, the side line of the C angle is parallel to the second aluminum die casting, and then surface cutting fluid is cleaned and dried;
s11, oxidizing in one color, obliquely placing the second aluminum die casting into the coloring bath solution and shaking at a constant speed to ensure that the second aluminum die casting is fully contacted with the coloring bath solution, wherein the concentration of the coloring bath solution reaches 150-160 g/L, the control voltage is 58-60V, and the peak current density is 1A/dm2The coloring time is 5-10min, and the cycle time from the drawing start of the step S9 to the color oxidation of the step S11 is within 48 h;
s12, milling a highlight surface, milling the highlight surface of the second aluminum die casting after the one-color oxidation by adopting a diamond chamfering highlight cutter, cleaning the surface and drying;
s13, oxidizing by dichromatic reaction, and obliquely putting secondary oxygen into the second aluminum die castingThe second aluminum die casting is fully contacted with the coloring bath solution, the concentration of the coloring bath solution reaches 150g/L-160g/L, the control voltage is 58V-60V, and the peak current density is 1A/dm2And coloring for 2-6min to obtain the finished product of the aluminum die casting, wherein the tensile strength of the aluminum die casting is 258-298MPa, and the elongation is 2.35-2.85%.
2. The multi-color oxidation process for aluminum die castings according to claim 1, wherein in the one-color oxidation of step S11 and the two-color oxidation of step S13, the coloring bath is drained after coloring, and the second aluminum die casting is transferred to a water bath for washing with water, and if the color is lighter than the desired color, the second aluminum die casting is re-placed in the coloring bath for color compensation, and if the color is darker than the desired color, the second aluminum die casting is placed in an acid water bath for color fading.
CN202010422385.6A 2020-05-19 2020-05-19 Multicolor oxidation process for aluminum die casting Active CN112030209B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010422385.6A CN112030209B (en) 2020-05-19 2020-05-19 Multicolor oxidation process for aluminum die casting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010422385.6A CN112030209B (en) 2020-05-19 2020-05-19 Multicolor oxidation process for aluminum die casting

Publications (2)

Publication Number Publication Date
CN112030209A CN112030209A (en) 2020-12-04
CN112030209B true CN112030209B (en) 2021-11-30

Family

ID=73579123

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010422385.6A Active CN112030209B (en) 2020-05-19 2020-05-19 Multicolor oxidation process for aluminum die casting

Country Status (1)

Country Link
CN (1) CN112030209B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114012353B (en) * 2021-09-30 2024-05-10 泰州星瑞精密工业有限公司 Manufacturing method of handle
CN115256056B (en) * 2022-06-13 2024-07-16 佛山市南海盈誉重型机械有限公司 Manufacturing process of aluminum alloy workpiece
CN115319418A (en) * 2022-08-22 2022-11-11 上海恬艮网络科技有限公司 Manufacturing process of pet bowl

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101760771A (en) * 2008-10-24 2010-06-30 吴江市天龙机械有限公司 Anodic oxidation surface treatment process method of aluminum die casting
CN103484916A (en) * 2013-09-29 2014-01-01 苏州利达铸造有限公司 Anodic oxidation treatment process of die-casting aluminum alloy for digital electronic product
CN103834834A (en) * 2014-03-12 2014-06-04 苏州凯宥电子科技有限公司 Anode-oxidable high-performance die-casting aluminum alloy and preparation method thereof
CN104607884A (en) * 2015-02-13 2015-05-13 广东欧珀移动通信有限公司 Processing technique of cellphone shell with metal luster
CN104690244A (en) * 2015-03-13 2015-06-10 格林精密部件(惠州)有限公司 Manufacturing process for aluminum-containing die-casting shell capable of anodic oxidation
KR20150092948A (en) * 2014-02-06 2015-08-17 인 경 황 Surface treatment method of aluminum-diecasting material
CN106862535A (en) * 2017-02-28 2017-06-20 安徽瑞林精科股份有限公司 A kind of automobile ACM valve body processing technologys
CN107263017A (en) * 2016-04-08 2017-10-20 东莞星河精密技术股份有限公司 Suitable for the production technology of the aluminum alloy frame of the integrated die-casting shaping of anodic oxidation
CN107904641A (en) * 2017-12-13 2018-04-13 重庆嘉萌鸿业科技有限公司 A kind of pack alloy process of surface treatment
KR20180050806A (en) * 2016-11-07 2018-05-16 윈엔윈(주) Method for color anodizing of aluminum product and the product of thereof
CN108277369A (en) * 2018-02-09 2018-07-13 兰州理工大学 A kind of high duralumin, hard alumin ium alloy processing technology of lightweight
CN109023467A (en) * 2018-08-30 2018-12-18 福建省锐驰电子科技有限公司 A kind of process of surface treatment of die casting
CN109676858A (en) * 2018-11-30 2019-04-26 东莞市晋益电子科技有限公司 A kind of composition metal die casting frame and its production method

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101760771A (en) * 2008-10-24 2010-06-30 吴江市天龙机械有限公司 Anodic oxidation surface treatment process method of aluminum die casting
CN103484916A (en) * 2013-09-29 2014-01-01 苏州利达铸造有限公司 Anodic oxidation treatment process of die-casting aluminum alloy for digital electronic product
KR20150092948A (en) * 2014-02-06 2015-08-17 인 경 황 Surface treatment method of aluminum-diecasting material
CN103834834A (en) * 2014-03-12 2014-06-04 苏州凯宥电子科技有限公司 Anode-oxidable high-performance die-casting aluminum alloy and preparation method thereof
CN104607884A (en) * 2015-02-13 2015-05-13 广东欧珀移动通信有限公司 Processing technique of cellphone shell with metal luster
CN104690244A (en) * 2015-03-13 2015-06-10 格林精密部件(惠州)有限公司 Manufacturing process for aluminum-containing die-casting shell capable of anodic oxidation
CN107263017A (en) * 2016-04-08 2017-10-20 东莞星河精密技术股份有限公司 Suitable for the production technology of the aluminum alloy frame of the integrated die-casting shaping of anodic oxidation
KR20180050806A (en) * 2016-11-07 2018-05-16 윈엔윈(주) Method for color anodizing of aluminum product and the product of thereof
CN106862535A (en) * 2017-02-28 2017-06-20 安徽瑞林精科股份有限公司 A kind of automobile ACM valve body processing technologys
CN107904641A (en) * 2017-12-13 2018-04-13 重庆嘉萌鸿业科技有限公司 A kind of pack alloy process of surface treatment
CN108277369A (en) * 2018-02-09 2018-07-13 兰州理工大学 A kind of high duralumin, hard alumin ium alloy processing technology of lightweight
CN109023467A (en) * 2018-08-30 2018-12-18 福建省锐驰电子科技有限公司 A kind of process of surface treatment of die casting
CN109676858A (en) * 2018-11-30 2019-04-26 东莞市晋益电子科技有限公司 A kind of composition metal die casting frame and its production method

Also Published As

Publication number Publication date
CN112030209A (en) 2020-12-04

Similar Documents

Publication Publication Date Title
CN112030209B (en) Multicolor oxidation process for aluminum die casting
CN1101478C (en) Process for preparing foam metal
CN102717032B (en) Precision casting method for automobile turbocharger casing part
CN103469024B (en) Special aluminum-alloy material for liquid die-forging molding of aluminum-alloy wheels of heavy-duty vehicle and molding method
CN101066555A (en) Process of making oil cylinder body and cover with aluminium alloy
CN102554125A (en) Precision casting method of aluminum gearbox
CN102689161B (en) Liquid die-forging and rolling combined forming method for 7075 aluminum alloy irregular-section large-size annular piece
CN105200276B (en) A kind of pseudo- alloy enhancing composite material piston manufacture method with inner-cooling oil recess
CN106513564A (en) Bearing cover casting process
CN104131202A (en) Short-process preparation method for 6061aluminum alloy die forging
CN106111913A (en) A kind of flange casting technique
CN102345024B (en) Smelting process of nickel bronze
CN106694853A (en) Method for casting motorcycle parts by use of low-pressure casting process
CN106048343A (en) High-strength aluminum alloy profile and production technology thereof
CN106048344A (en) High-strength aluminum alloy profile and production process thereof
CN105586504A (en) Large shaft sleeve and casting method thereof
CN107052226A (en) A kind of end cap casting technique
CN101406933A (en) Wax liquor discharging technique for dewaxing of precision casting shell
CN103949578A (en) Automobile engine cylinder cover and manufacturing method thereof
CN102689157B (en) The liquid forging Rolling compund manufacturing process of the different section ring parts of copper alloy
CN111748714A (en) Anodic oxidation die-casting aluminum alloy material and preparation method thereof
CN1911563B (en) Method for casting large thin wall rotating body high strength aluminium alloy casting
CN104550740A (en) Method for casting large thin-wall rotation body high strength aluminum alloy casting
CN103433466A (en) Aluminum alloy liquid forging mould and combined forming method of starter outer shell
CN101347829A (en) Sand casting copper anode mold technique

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant