CN107245745A - Die casting surface treatment method and die casting - Google Patents
Die casting surface treatment method and die casting Download PDFInfo
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- CN107245745A CN107245745A CN201710440053.9A CN201710440053A CN107245745A CN 107245745 A CN107245745 A CN 107245745A CN 201710440053 A CN201710440053 A CN 201710440053A CN 107245745 A CN107245745 A CN 107245745A
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- die casting
- electrodeposited coating
- treatment method
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
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- 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
- C25D5/48—After-treatment of electroplated surfaces
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- 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
- C25D5/48—After-treatment of electroplated surfaces
- C25D5/52—After-treatment of electroplated surfaces by brightening or burnishing
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The present invention provides a kind of die casting surface treatment method and die casting.Including the steps：Pre-galvanized processing is carried out to die casting surface and forms electrodeposited coating, so that the electrodeposited coating covers and fills the surface defect positions of the die casting；The electrodeposited coating on the die casting surface is processed by shot blasting, to reach smooth consistent plating layer surface；Incrustation processing is carried out on electrodeposited coating after the polishing, to obtain the die casting outer surface for meeting application demand.The technical scheme that the present invention is provided, solves the outward appearance pit defect such as die casting surface pores, sand holes, pin hole, while avoiding deformation and the aberration of die casting product.
Description
Technical field
The present invention relates to metal casting technique field, more particularly to a kind of die casting surface treatment method and die casting.
Background technology
With the arrival of electronic product metallization trend spring tide, die casting obtains more widely using.Press casting procedure is related to
And fusing, in a mold injection, the technical process such as solidification of alloy, cause the various die castings that die casting is obtained to deposit table after a polish
There is the open defects such as stomata, sand holes and pin hole in face, and then influence die casting as the use of high-end appearance member.
At present, to solve drawbacks described above, mainly using following method：1st, hot dipping method；For small-sized die casting,
Hot-dip can cause deformation of products, influence following process and the assembling of product.At the same time, for the high metastable state of heat sensitivity
Non-crystaline amorphous metal, hot dipping method is easily caused product crystallization, hydraulic performance decline.2nd, cold spray process；Cold spray apparatus and powder body material into
This is higher, has high requirement to frock smelting, meanwhile, cold spraying pressure is also easily caused deformation of products.3rd, repair welding method or glue
Method；This method the quantity such as stomata, sand holes and pin hole and size it is less in the case of, it is not easy to operate realize, while also holding
It is easily caused product and aberration occurs.
To sum up, a kind of new die casting process of surface treatment is urgently proposed.
The content of the invention
The present invention provides a kind of die casting surface treatment method and die casting, to solve die casting surface pores, sand
The outward appearance pit defect such as eye, pin hole.
The present invention provides a kind of die casting surface treatment method, including：
Pre-galvanized processing is carried out to die casting surface and forms electrodeposited coating, so that the electrodeposited coating covers and fills the die casting
The surface defect positions of part；
The electrodeposited coating on the die casting surface is processed by shot blasting, to reach smooth consistent plating layer surface；
Incrustation processing is carried out on electrodeposited coating after the polishing, to obtain the die casting appearance for meeting application demand
Face.
Still optionally further, the surface defect positions of the die casting are pit, and die casting surface is carried out at pre-galvanized
Reason is formed before electrodeposited coating, in addition to：According to the depth of the pit, the plating thickness of the pre-galvanized processing is defined.
Still optionally further, the plating thickness is more than the depth of the pit.
Still optionally further, depth at least big 0.1mm of the plating thickness than the pit.
Still optionally further, depth big 0.2mm~0.5mm of the plating thickness than the pit.
Still optionally further, the polishing, including：In being polished using mechanical polishing, chemical polishing and magnetic force extremely
A kind of few glossing is polished to the electrodeposited coating.
Still optionally further, the processing, including：Using at least one in plating, physical vapour deposition (PVD) and anodic oxidation
Plant the die casting after trailing is polished to the electrodeposited coating and carry out incrustation processing.
Still optionally further, the electrodeposited coating, including：With the electroplate liquid shape comprising at least one of chromium, nickel, aluminium and copper
Into electrodeposited coating.
The present invention provides a kind of die casting, including：
Die casting body；
It is attached to the electrodeposited coating of the die casting body；And it is attached to the decorative layer of the plating layer surface.
Still optionally further, the electrodeposited coating is the metal level for including at least one of chromium, nickel, aluminium and copper.
In embodiments of the present invention, by carrying out pre-galvanized processing to die casting with the surface of die casting formation electrodeposited coating
To cover and fill the surface defect positions of die casting, the electrodeposited coating is processed by shot blasting, and it is as needed after polishing
Incrustation processing is carried out, while die casting surface pores, sand holes, the outward appearance pit defect such as pin hole is solved, it is to avoid pressure
The deformation of cast product and aberration.In addition, this method is during operation, no heating link, therefore can be applied to include
Wider alloy pressuring casting scope including amorphous alloy die casting.At the same time, this method is utilized plating and polishing link
It can be realized based on existing plating and polishing technology, it is easy to operate, cost is low and mass production efficiency high.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of die casting surface treatment method provided in an embodiment of the present invention；
Fig. 2 is the schematic flow sheet of another die casting surface treatment method provided in an embodiment of the present invention；
Fig. 3 is the structural representation of a die casting provided in an embodiment of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Fig. 1 is the schematic flow sheet of die casting surface treatment method provided in an embodiment of the present invention, with reference to Fig. 1, the party
Method includes：
Step 110, pre-galvanized processing is carried out to die casting surface form electrodeposited coating, so that the electrodeposited coating is covered and filled
The surface defect positions of the die casting.
Step 120, the electrodeposited coating to die casting surface are processed by shot blasting, to reach smooth consistent plating layer surface.
Incrustation processing is carried out in step 130, electrodeposited coating after a polish, to obtain the die casting for meeting application demand
Outer surface.
For step 110, pre-galvanized processing is carried out to die casting surface, can be with it is intended that handled by pre-galvanized
So that electrodeposited coating covers and fills the surface defect positions of die casting.It may be deposited on die casting surface for example, electrodeposited coating can be filled
The pit such as stomata, sand holes and pin hole.Alternatively, die casting is carried out before pre-galvanized processing, can be based on existing
Die casting manufacturing procedure, is polished, degreasing degreasing and surface activation process to the die casting that die casting is obtained.
For step 120, in previous step, after die casting progress pre-galvanized processing, the pit on die casting surface
It can be filled and led up, result in smooth consistent plating layer surface.The plating thickness used in pre-galvanized processing procedure is identical,
But because die casting surface irregularity (such as there is pit), the die casting surface after pre-galvanized is handled, which remains unchanged, deposits
In rough defect.Accordingly, it would be desirable to be processed by shot blasting to the electrodeposited coating on die casting surface, it is intended that obtaining recessed
Hole has the die casting of flat surface after being filled.
For step 130, according to the application scenarios of die casting, the enterprising step of electrodeposited coating after a polish carries out incrustation
Processing, to obtain the die casting for meeting application demand.Alternatively, the incrustation processing carried out on electrodeposited coating after a polish,
Can be at least one of plating, physical vapour deposition (PVD) (Physical Vapor Deposition, PVD) and anodic oxidation,
So as to obtain the superficial layer of decoration protectiveness and various functions on die casting.
In the present embodiment, by carrying out pre-galvanized processing to die casting to form electrodeposited coating on the surface of die casting, to this
Electrodeposited coating is processed by shot blasting, and carries out incrustation processing as needed after polishing, solve die casting surface pores,
While the outward appearance pit defect such as sand holes, pin hole, it is to avoid the deformation of die casting product and aberration.In addition, this method is in behaviour
During work, no heating link, therefore the wider alloy pressuring casting model that can be applied to including amorphous alloy die casting
Enclose.At the same time, the plating and polishing link that this method is utilized can be realized based on existing plating and polishing technology, it is easy to
Operation, cost is low and mass production efficiency high.
Fig. 2 is the schematic flow sheet of another die casting surface treatment method provided in an embodiment of the present invention, with reference to Fig. 2, should
Method includes：
Step 210, the depth according to pit on die casting surface, define plating thickness.
Step 220, according to plating thickness, pre-galvanized processing is carried out to die casting.
Step 230, using mechanical polishing, chemical polishing and magnetic force polishing at least one of glossing electrodeposited coating is entered
Row polishing.
Step 240, using at least one of plating, physical vapour deposition (PVD) and anodic oxidation trailing electrodeposited coating is thrown
Die casting after light carries out incrustation processing.
For step 210, when carrying out pre-galvanized to die casting, plating thickness need to be specified.In the present embodiment, according to pressure
The depth of pit on casting, defines plating thickness.The purpose of pre-galvanized is the pit for filling die casting surface, therefore, in advance
The depth that the plating thickness of electroplating processes should be greater than pit can be only achieved rational filling effect.
In an optional embodiment, plating thickness requirement reach fill and lead up die casting surface crater after be higher by 0.1mm again
More than, i.e., plating thickness than pit at least big 0.1mm of depth, to ensure that the follow-up die casting after to pre-galvanized is carried out
During polishing, enough polishing leeway is left.
It is preferred that, as depth big 0.2mm~0.5mm of the plating thickness than pit, i.e., to fill and lead up die casting surface recessed
0.2mm~0.5mm is higher by behind hole again, now the preferable and follow-up polishing surplus of the filling effect of pit is more reasonable.
For step 220, pre-galvanized processing is carried out to die casting, optionally, to include chromium (Cr), nickel (Ni), aluminium (Al)
With the electroplate liquid of at least one of copper (Cu), pre-galvanized processing is carried out to die casting.
Pre-galvanized processing is carried out to die casting, can not only fill the pit on die casting to make up lacking for die casting surface
Fall into, the performance of die casting can also be increased by using different electroplate liquids.For example, during to die casting nickel plating, can improve
The conductive contact impedance of die casting, enhancing signal transmission；During to die casting copper facing, electrodeposited coating adhesive ability can be increased, and it is anti-
Erosion ability etc..Which kind of specifically chosen electroplate liquid according in practice to the performance requirement of die casting depending on, the embodiment of the present invention is to electricity
The species of plating solution is not limited.It is above-mentioned die casting nickel plating to be referred to the electroplate liquid comprising nickel, die casting is carried out at pre-galvanized
Reason；Correspondingly, it is above-mentioned die casting copper facing to be referred to the electroplate liquid comprising copper, pre-galvanized processing is carried out to die casting.
For step 230, during pre-galvanized, because plating thickness is more than the depth of the pit on die casting surface
Spend, therefore the pit on die casting surface is filled during pre-galvanized.But, area of the die casting surface in addition to pit
Domain also has same plating thickness, therefore electrodeposited coating is overall still uneven, and due to the presence of electrodeposited coating, die casting
Size be varied from.Therefore, in this step, the electrodeposited coating on die casting surface is processed by shot blasting, on the one hand can be caused
Die casting after pre-galvanized reaches smooth mirror effect；On the other hand, a part of plating thickness is polished off, with to follow-up
Incrustation processing provides size leeway.
Optionally, in embodiments of the present invention, the plating thickness in region and pit areas of the die casting surface without pit
It is identical, therefore in polishing, to reach surfacing, the thickness of polishing should be more than or equal to the depth of pit.It is further optional
Ground, to ensure the dimensional accuracy of die casting, the thickness of polishing should be less than the plating thickness equal to pre-galvanized.For example, die casting
The depth of upper pit is 0.3mm, and the plating thickness of pre-galvanized is the region without pit on 0.5mm, i.e. die casting surface than recessed
The high 0.3mm in region in hole.Then in polishing, preferred polishing thickness should be located between 0.3mm~0.5mm, including 0.3mm with
And 0.5mm.
It is ripe prior art because the mechanical polishing in this step, chemical polishing and magnetic force are polished, herein not
Repeat again.
, can be using at least one of plating, physical vapour deposition (PVD) (PVD) and anodic oxidation decoration side for step 240
Die casting after method is polished to electrodeposited coating carries out incrustation processing.In practical operation, using which kind of surface decorating method pair
Die casting after electrodeposited coating polishing carries out incrustation processing, depending on the application demand and performance requirement of die casting, this hair
Bright embodiment is not repeated.
In the present embodiment, plating thickness is defined according to the depth of the pit on die casting and pre-galvanized is carried out to die casting
Processing, rationally ensure that filling effect of the pre-galvanized to pit, solves pin hole, stomata and sand present on die casting surface
The defects such as eye.After pre-galvanized, electrodeposited coating is processed by shot blasting, and carried out as needed at incrustation after polishing
Reason, it is to avoid the deformation of die casting product and aberration.At the same time, this method can be applied to include amorphous alloy die casting to exist
Interior wider alloy pressuring casting scope, and easily operated, mass production efficiency high.
Following part will be entered with reference to specific application scenarios to die casting surface treatment method provided in an embodiment of the present invention
Row is illustrated.
Application example one
ADC12 (No. 12 aluminium material) aluminum alloy die casting that die casting is obtained is polished, and eliminates the obvious stream on surface
Trace, makes surface reach mirror effect.Then ADC12 aluminum alloy die castings are carried out at degreasing degreasing and surface active and leaching zinc
Reason.Detect the depth capacity of the pit and pit on ADC12 aluminum alloy die castings.If the depth of maximum pit is 0.03mm,
Then Cr can be electroplated to ADC12 aluminum alloy die castings with more than 0.2mm plating thickness.After the completion of plating, using mechanical polishing,
Polish off 0.05mm electrodeposited coatings.Finally carry out anodized and reach desired appearance.
The ADC12 aluminum alloy die castings obtained after above-mentioned surface treatment procedure, draw in the test of experience neutral salt spray, pencil
After trace hardness test and glossiness test, determine that its corrosion resistance, hardness and glossiness meet electronic product appearance member
Reliability requirement.
Application example two
H64 (copper content 64%, zinc content 36%) the copper alloy die casting obtained to die casting is polished, and eliminates surface
Obvious current mark, makes surface reach mirror effect.Then degreasing degreasing is carried out to H64 copper alloys die casting and surface is lived
Change.Detect the depth capacity of the pit and pit on H64 copper alloy die castings.If the depth of maximum pit is 0.04mm,
Cr can be electroplated to ADC12 aluminum alloy die castings with more than 0.2mm plating thickness.After the completion of plating, using mechanical polishing, throw
Light falls 0.05mm electrodeposited coatings.Finally carry out electroplating processes and reach desired appearance.
The H64 copper alloy die castings obtained after above-mentioned surface treatment procedure, in the test of experience neutral salt spray, Pencil scratch
After hardness test and glossiness test, determining that its corrosion resistance, hardness and glossiness meet electronic product appearance member can
Required by property.
Application example three
The zirconium-base amorphous alloy ((Zr obtained to die casting52.5Cu17.9Al10Ni14.6Ti5)99.5Y0.5) die casting is polished,
The obvious stream current mark on surface is eliminated, surface is reached mirror effect.Then degreasing is carried out to zirconium-base amorphous alloy die casting
Oil removing and surface active.Detect the depth capacity of the pit and pit on zirconium-base amorphous alloy die casting.If maximum pit
Depth be 0.04mm, then can with more than 0.2mm plating thickness to zirconium-base amorphous alloy die casting electroplate Cr.Plating is completed
Afterwards, 0.06mm electrodeposited coatings are polished off using magnetic-force flexible.Finally carry out PVD processing and reach desired appearance.
The zirconium-base amorphous alloy die casting obtained after above-mentioned surface treatment procedure, in the test of experience neutral salt spray, pencil
After scratch hardness test and glossiness test, determine that its corrosion resistance, hardness and glossiness meet electronic product outward appearance
Part reliability requirement.
Fig. 3 is the structural representation of a die casting provided in an embodiment of the present invention, as shown in figure 3, the die casting includes：Pressure
Casting body 31, is attached to the electrodeposited coating 32 of die casting body 31, and is attached to the decorative layer 33 on the surface of electrodeposited coating 32.
It is alternatively possible to the die casting surface treatment method provided using above method embodiment, to die casting body 31
Pre-galvanized processing is carried out, to obtain the electrodeposited coating 32 for being attached to die casting body 31.Further, it is alternatively possible to electrodeposited coating
32 are processed by shot blasting.
It is alternatively possible to which the die casting surface treatment method provided using above method embodiment, enterprising in electrodeposited coating 32
Row incrustation processing, to obtain the decorative layer 33 for being attached to the surface of electrodeposited coating 32.
Wherein, electrodeposited coating 32 is the metal level for including at least one of chromium, nickel, aluminium and copper, specific visual pre-galvanized processing
Depending on the electroplate liquid of use.
Die casting provided in an embodiment of the present invention, surface it is smooth without pit, corrosion resistance is strong, hardness is high, no color differnece and
Glossiness is good, can be well applied to the appearance member of high-end electronic product.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
1. a kind of die casting surface treatment method, it is characterised in that including：
Pre-galvanized processing is carried out to die casting surface and forms electrodeposited coating, so that the electrodeposited coating covers and fills the die casting
Surface defect positions；
The electrodeposited coating on the die casting surface is processed by shot blasting, to reach smooth consistent plating layer surface；
Incrustation processing is carried out on electrodeposited coating after the polishing, to obtain the die casting outer surface for meeting application demand.
2. die casting surface treatment method according to claim 1, it is characterised in that the surface defect position of the die casting
It is set to pit；
Pre-galvanized processing is carried out to die casting surface to be formed before electrodeposited coating, in addition to：
According to the depth of the pit, the plating thickness of the pre-galvanized processing is defined.
3. die casting surface treatment method according to claim 2, it is characterised in that the plating thickness is more than described
The depth of pit.
4. die casting surface treatment method according to claim 3, it is characterised in that the plating thickness is more recessed than described
At least big 0.1mm of the depth in hole.
5. die casting surface treatment method according to claim 4, it is characterised in that the plating thickness is more recessed than described
Big 0.2mm~the 0.5mm of depth in hole.
6. die casting surface treatment method according to claim 1, it is characterised in that the polishing, including：
Using at least one of mechanical polishing, chemical polishing and magnetic force polishing glossing, the electrodeposited coating is polished
Processing.
7. die casting surface treatment method according to claim 1, it is characterised in that the incrustation processing, including：
Using at least one of plating, physical vapour deposition (PVD) and anodic oxidation trailing, the electrodeposited coating after the polishing
Upper progress incrustation processing.
8. the die casting surface treatment method according to any one of Claims 1 to 5, it is characterised in that the electrodeposited coating, bag
Include：
With the electrodeposited coating formed comprising the electroplate liquid of at least one of chromium, nickel, aluminium and copper.
9. a kind of die casting, it is characterised in that including：
Die casting body；
It is attached to the electrodeposited coating of the die casting body；And
It is attached to the decorative layer of the plating layer surface.
10. die casting according to claim 9, it is characterised in that the electrodeposited coating be comprising in chromium, nickel, aluminium and copper extremely
A kind of few metal level.
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| CN201710440053.9A CN107245745A (en) | 2017-06-12 | 2017-06-12 | Die casting surface treatment method and die casting |
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| CN108203840A (en) * | 2017-12-29 | 2018-06-26 | 天津圣金特汽车配件有限公司 | A kind of magnesium alloy engine support surface processing technique |
| CN108907903A (en) * | 2018-07-16 | 2018-11-30 | 苏州艾斯肯机电设备有限公司 | A kind of electromechanical equipment processing of surface polishing |
| CN109128159A (en) * | 2018-09-21 | 2019-01-04 | 歌尔股份有限公司 | A kind of method and mold of the roughness on the surface for reducing coarse material |
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| CN112643013A (en) * | 2020-12-02 | 2021-04-13 | 东莞仁海科技股份有限公司 | Die casting surface anodic treatment process |
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| CN111590059A (en) * | 2020-05-28 | 2020-08-28 | 安徽凯斯威精工科技有限公司 | Infiltration liquid for copper-nickel/iron-nickel alloy and use method and application thereof |
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