CN101767272A - Casting with isolation layer and manufacture method thereof - Google Patents
Casting with isolation layer and manufacture method thereof Download PDFInfo
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- CN101767272A CN101767272A CN200810188844A CN200810188844A CN101767272A CN 101767272 A CN101767272 A CN 101767272A CN 200810188844 A CN200810188844 A CN 200810188844A CN 200810188844 A CN200810188844 A CN 200810188844A CN 101767272 A CN101767272 A CN 101767272A
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Abstract
The invention discloses a casting with an isolation layer and a manufacture method thereof. The invention is mainly characterized in that in an electromagnetic pulse engagement step, an alloy component comprising a first metallic element is correspondingly arranged on a base material mainly comprising the iron element, the component is combined with the base material by an electromagnetic pulse engagement method for forming an embedded component of the isolation layer, and then a casting material comprising a second metallic element is selected in the casting step, wherein the activity difference of the first metallic element and the iron element is smaller than that of the second metallic element and the iron element, the casting material is made into casting blanks by a casting method to be combined with the embedded component, and a casting with the isolation layer is obtained.
Description
Technical field
The present invention relates to a kind of foundry goods and its preparation method, particularly relate to a kind of foundry goods and its preparation method that constitutes by dissimilar materials.
Background technology
Material is often because intensity can't be born other factorses such as destruction that load produces, abrasion, burn into radiation injury causes its usability to reduce or can't use, this influence especially with corrosion (corrosion) for, get rusty (rusting) be exactly everybody corrosion or oxidation reaction of knowing, it specially refers to the corrosion phenomenon of iron or ferroalloy, and the corrosion kenel of ferrous materials is generally divided into eight big classes: homogeneous corrosion, Jia Fanni burn into crevice corrosion, hole burn into grain boundary corrosion, selectivity, dash the stress corrosion of mill burn into.Wherein, the corrosion phenomenon that causes when directly contacting because of different metal is called Jia Fanni corrosion (galvanic corrosion), just, when two kinds of different metal couplings when contacting, the active metal of chemical property can accelerated corrosion, the metal that inertia the is bigger corrosion of then slowing down, this kind corrosion is called the Jia Fanni corrosion, or be called dissimilar metal corrosion, such as copper pipe and steel pipe join, and must cause the accelerated corrosion of steel pipe.
With general vapour/locomotive spare part is example, and though be wheel rim, piston or engine cylinder cover etc. all for by different metal, and/or the alloy casting in conjunction with and get.
Consult Fig. 1, Fig. 2, with the aluminium alloy rim is example, one of preparation method of present aluminium alloy rim, be with the casting processing procedure wheel ring framework of steel system or axle to be coated with aluminium alloy to form, because the poor activity of iron and aluminium is less, therefore be difficult between the interface of the aluminium alloy of the skeleton of steel system or axle and coating forming the Jia Fanni corrosion effect, and can obtain quality and all good steel/aluminium alloy formula wheel rim of stability.
Yet because the proportion of aluminium alloy is bigger, be the arriving in response to soaring oil prices, the lightweight of vapour/locomotive spare part also becomes the research and development main shaft of each big factory of vapour/locomotive; And find as if the aluminium alloy that replaces with magnesium alloy in order to the wheel frame that constitutes wheel rim that by practical study then weight can reduce 60% approximately, therefore for the lightweight of vapour/locomotive spare part, magnesium alloy is the excellent materials of a development.
But, when replacing above-mentioned aluminium alloy with magnesium alloy, but can be more much bigger than aluminium, iron because of the poor activity between magnesium, iron, therefore, coat the magnesium alloy wheel rim that steel form with magnesium alloy and very easily produce all Buddhist nun's corrosion of cangue, that is to say, when replacing the combined type wheel rim that aluminium alloy was made with the magnesium alloy of lightweight more, relatively be easy to generate the problem of corrosion failure, and influence travel safety.
Because the combination between the big dissimilar metal of activity difference, follow-up incident be exactly because the different and etching problem that produces of activity difference each other, therefore, how to develop preparation method reliable and that processing procedure is easy and come the combination big dissimilar metal/alloy of activity difference each other, to avoid and all Buddhist nun's etching problems of the cangue of a generation on its boundary, and then obtain processing procedure product easy and of fine qualities, be the problem that present industry is made great efforts research.
Summary of the invention
The objective of the invention is is providing a kind of foundry goods with separation layer of avoiding etching problem between the dissimilar metal interface.
Moreover another object of the present invention is in the preparation method that a kind of process foundry goods with separation layer simple, that control easily is provided.
The foundry goods that the present invention has separation layer comprises an insert, and a casting embryo.
This insert has a base material that mainly comprises ferro element, and one by the separation layer that alloy constituted that comprises one first metallic element, and this separation layer is through electromagnetic pulse juncture and this base material be combined into an alloy components.
This casting embryo is made of an alloy that comprises one second metallic element, and is connected with this insert with forging type, and the poor activity of this first metallic element and ferro element is less than the poor activity of this second metallic element and ferro element.
Moreover the present invention has the preparation method of the foundry goods of separation layer, comprises an electromagnetic pulse engagement step, and a casting step.
This electromagnetic pulse engagement step is arranged on one with a member correspondence that comprises one first metallic element and mainly comprises on the base material of ferro element, and make this member combine with this base material with the electromagnetic pulse juncture, form one and have one and constitute the insert of separation layer by this member.
This casting step selection one comprises the casting material of one second metallic element, wherein, the poor activity of this first metallic element and ferro element is less than the poor activity of this second metallic element and ferro element, should cast material with forging type is connected with this insert, and make this casting material form a casting embryo that combines with this insert, make the foundry goods that this has separation layer.
Beneficial effect of the present invention is: utilize the electromagnetic pulse juncture to form on base material and constitute element and the lower separation layer of ferro element poor activity, form on separation layer with simple forging type again and constitute element and the bigger casting embryo of iron poor activity, and can be simply and avoid the Jia Fanni corrosion effect that produces between the big dissimilar metal of activity difference effectively, and then obtain all good foundry goods of Corrosion Protection, quality and reliability with separation layer.
Description of drawings
Fig. 1 is a kind of stereogram of " aluminium alloy rim " in the past;
Fig. 2 is this cutaway view of aluminium alloy rim in the past;
Fig. 3 is the stereogram of the preferred embodiment of the foundry goods of the present invention with separation layer;
Fig. 4 is the cutaway view of this preferred embodiment of the present invention;
Fig. 5 is the flow chart of the preparation method of this preferred embodiment of the present invention;
Fig. 6 is the schematic diagram of an electromagnetic pulse engagement device;
Fig. 7 is the cutaway view Amplified image of the aspect of this preferred embodiment insert of the present invention; And
Fig. 8 is the cutaway view Amplified image of another aspect of this preferred embodiment inserts of the present invention.
The specific embodiment
The present invention is described in detail below in conjunction with drawings and Examples:
Consult Fig. 3, Fig. 4, Fig. 5, the foundry goods that has separation layer as shown in Figure 3, Figure 4 is to be made and got by a preferred embodiment of the preparation method of the foundry goods that has separation layer as shown in Figure 5, at this, this foundry goods is to be that example explains with vapour/locomotive wheel rim, but application of the present invention is not as limit.
Consult Fig. 3, Fig. 4, this foundry goods with separation layer comprises an insert 2, and a casting embryo 3.
This insert 2 has a base material 21 that mainly comprises ferro element, reach one by the separation layer that alloy constituted 22 that comprises one first metallic element, in present embodiment, this base material 21 is the inner edge framework of wheel rim, this base material 21 is to be selected from stainless steel, cast iron, or iron and steel constitutes, this base material 21 is made of stainless steel in present embodiment, becomes hollow tubular also to have a surrounding wall 211, and two connect respectively this surrounding wall 211 on, the end face 212 of following apical margin, this first metallic element is an aluminium, that is to say that this separation layer 22 is that aluminium alloy constitutes, and thickness is between 0.2mm～4.0mm, in the present embodiment, the thickness of this separation layer 22 is 1mm.
This casting embryo 3 is made of an alloy that comprises one second metallic element, and the poor activity of this first metallic element and ferro element is less than the poor activity of this second metallic element and ferro element, and in the present embodiment, this second metallic element is a magnesium, that is to say that this casting embryo 3 is by being made of magnesium alloy.
Above-mentioned this has the preferred embodiment of the foundry goods of separation layer, after cooperating following the present invention to have the explanation of preparation method of foundry goods of separation layer, when can be clearer.
At first consult Fig. 6, this electromagnetic pulse engagement device is to comprise an electromagnetic pulse coil 41, a power supply unit 42, an and processing space 43, this power supply unit 42 can provide a pulse current to this electromagnetic pulse coil 41 producing a magnetic field, this processing space 43 can be processed for workpiece is ccontaining.
Consult Fig. 5, Fig. 6, Fig. 7, at first carry out electromagnetic pulse engagement step 51, after this base material 21 being inserted the processing space 43 of above-mentioned this electromagnetic pulse engagement device, one aluminium alloy element correspondence is centered around the surrounding wall 211 of this base material 21, in this enforcement, this aluminium alloy element is to be annular component, its ancient piece of jade, round, flat and with a hole in its centre is thick to be 1mm, inside and outside this base material 21 and the corresponding aluminium alloy element that centers on, be stacked in this processing space 43, and provide a pulse current through this power supply unit 42, produce magnetic field when this aluminium alloy element is surperficial by this electromagnetic pulse coil 41, this aluminium alloy element surface can induction form vortex flow and produce the magnetic field of repelling each other, this aluminium alloy element and this electromagnetic pulse coil 41 just simultaneously can be sensed one electromagnetic pulse forming stress, when aluminium alloy element bears electromagnetic pulse forming stress greater than the yield strength of aluminium alloy itself, then produce permanent deformation and this aluminium alloy element and this surrounding wall 211 can be combined closely and form this separation layer 22, promptly make insert 2 as shown in Figure 7.
Specifically, when the thickness of aluminium alloy element thickens, need to promote the pulse current intensity that is provided relatively, could produce enough shaping stress is bonded together this base material 21 with this aluminium alloy element, so not only can increase the time and the cost of processing procedure, and the compactness that this base material 21 engages with this aluminium alloy element also can be affected, therefore, preferably, the thickness of this aluminium alloy element is for being not more than 5mm.
And the processing procedure control when allowing this base material 21 engage, engage quality and isolation effect reaches optimization with aluminium alloy element, therefore, more preferably, the thickness of this aluminium alloy element is between 0.2mm～4mm.
Consult Fig. 5, then cast step 52, in die casting (die casting) mode, this insert 2 is inserted one to have in the die casting space of an opening and keeps a distance with the bottom in this die casting space, and towards this opening, then the magnesium alloy liquid with melting is poured in this die casting space, after cooling with the wherein end face of this base material 21, form the casting embryo 3 that coats this insert surface as shown in Figure 3 with U-shaped, promptly make the foundry goods that this has separation layer.In this step, also can adopt high-pressure casting (extrusion casint-squeeze casting, die casting-die casting and semi-solid casting-semi-solid casting), gravitational casting (permanent mold) and sand casting modes such as (sand casting) are carried out, because these forging types are not creation emphasis of the present invention, and known by industry, so no longer add to give unnecessary details at this.
Again, consult Fig. 8, for fear of coating because of the end face 212 no separation layers 22 of this base material 21, and when follow-up casting forms the casting embryo 3 that coats this insert 2, because of casting embryo 3 directly contacts the corrosion that causes with these base material 21 parts, therefore, preferably, when carrying out this electromagnetic pulse engagement step 52, this aluminium alloy element also can be to should surrounding wall 211, and extend the end face 212 wherein be bent to should base material 21, form insert 2 as shown in Figure 8, so can be when carrying out follow-up this casting step 52, this insert 2 is placed towards this mould with the end face 212 that is coated by separation layer 22, and can after casting is finished, obtain a base material 21 that does not contact with this casting embryo 3, because when carrying out engaging of aluminium alloy element and this base material 21 with electromagnetic pulse is to apply a yield strength greater than aluminium alloy itself by 41 pairs of aluminium alloy elements of electromagnetic pulse coil, make this aluminium alloy element produce permanent deformation and combine closely with this base material 21, therefore comparable when separation layer 22 and the composition surface of this base material 21 are an angle and bend general to carry out the mode that different metal engages with the mechanical force close-fitting more tight and incrust, and better isolation effect can be provided.
By above explanation as can be known, the foundry goods that the present invention has separation layer utilizes the electromagnetic pulse juncture to form a separation layer at substrate surface, the not only simple control easily of processing procedure, and adhesive force is good, and can effectively improve the etching problem that produces between the big dissimilar metal of activity difference, and the separation layer and the base material that form via the electromagnetic pulse juncture have good adherence, and poor adhesive force can avoid general dissimilar metal to engage the time, easily peel off or the shortcoming of uneven thickness, and in follow-up processing procedure of casting and use, produce dissimilar metal interfacial corrosion and damaged problem, and it is simple and easy to obtain a processing procedure, easy control and quality and all good foundry goods of reliability are so can reach purpose of the present invention really.
Claims (13)
1. preparation method with foundry goods of separation layer is characterized in that:
One electromagnetic pulse engagement step, the one member correspondence that comprises one first metallic element is arranged on one mainly to be comprised on the base material of ferro element, and make this member combine with this base material with the electromagnetic pulse juncture, form one and have one and constitute the insert of separation layer by this member; And
One casting step, selection one comprises the casting material of one second metallic element, wherein, the poor activity of this first metallic element and ferro element is less than the poor activity of this second metallic element and ferro element, should cast material with forging type is connected with this insert, and make this casting material form a casting embryo that combines with this insert, make the foundry goods that this has separation layer.
2. have the preparation method of the foundry goods of separation layer according to claim 1, it is characterized in that: this base material is to be selected from stainless steel, cast iron, or iron and steel, and this first metallic element is an aluminium, and this second metallic element is a magnesium.
3. as having the preparation method of the foundry goods of separation layer as described in as described in the claim 2, it is characterized in that: the thickness of this member is 0.2mm～4mm.
4. as having the preparation method of the foundry goods of separation layer as described in the claim 1,2 or 3, wherein, this casting embryo is not connected with this separation layer in contact with this base material.
5. preparation method with foundry goods of separation layer is characterized in that:
One electromagnetic pulse engagement step, the one member correspondence that comprises one first metallic element is arranged on one mainly to be comprised on the base material of ferro element, wherein, this base material is an inner edge framework, and make this member combine with this base material with the electromagnetic pulse juncture, form one and have one and constitute the insert of separation layer by this member; And
One casting step, selection one comprises the casting material of one second metallic element, wherein, the poor activity of this first metallic element and ferro element is less than the poor activity of this second metallic element and ferro element, should cast material with forging type is connected with this insert, and make this casting material form a casting embryo that combines with this insert, make the foundry goods that this has separation layer, and this foundry goods is a wheel rim.
6. as having the preparation method of the foundry goods of separation layer as described in the claim 5, it is characterized in that: this base material is to be selected from stainless steel, cast iron, or iron and steel, and this first metallic element is an aluminium, and this second metallic element is a magnesium.
7. as having the preparation method of the foundry goods of separation layer as described in the claim 6, it is characterized in that: the thickness of this member is 0.2mm～4mm.
8. as having the preparation method of the foundry goods of separation layer as described in the claim 5,6 or 7, it is characterized in that: this casting embryo is not connected with this separation layer in contact with this base material.
9. the foundry goods with separation layer comprises an insert, and a casting embryo, it is characterized in that:
This insert has a base material that mainly comprises ferro element, reach one by the separation layer that alloy constituted that comprises one first metallic element, and this separation layer is through electromagnetic pulse juncture and this base material be combined into an alloy components, this casting embryo is made of an alloy that comprises one second metallic element, and be connected with this insert with forging type, and the poor activity of this first metallic element and ferro element is less than the poor activity of this second metallic element and ferro element.
10. as having the foundry goods of separation layer as described in the claim 9, it is characterized in that: this base material is to be selected from stainless steel, cast iron, or iron and steel, and this first metallic element is an aluminium, and this second metallic element is a magnesium.
11. as having the foundry goods of separation layer as described in the claim 10, it is characterized in that: the thickness of this member is 0.2mm～4mm.
12. as having the foundry goods of separation layer as described in the claim 9,10 or 11, it is characterized in that: this casting embryo is not connected with this separation layer in contact with this base material.
13. as having the foundry goods of separation layer as described in the claim 9, it is characterized in that: this foundry goods is one to link the wheel rim that this insert forms by this casting embryo.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101888448A CN101767272B (en) | 2008-12-30 | 2008-12-30 | Casting with isolation layer and manufacture method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101888448A CN101767272B (en) | 2008-12-30 | 2008-12-30 | Casting with isolation layer and manufacture method thereof |
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| CN101767272A true CN101767272A (en) | 2010-07-07 |
| CN101767272B CN101767272B (en) | 2012-03-21 |
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| CN2008101888448A Active CN101767272B (en) | 2008-12-30 | 2008-12-30 | Casting with isolation layer and manufacture method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102441657A (en) * | 2010-10-12 | 2012-05-09 | 通用汽车环球科技运作有限责任公司 | Bimetallic casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053620C (en) * | 1996-09-27 | 2000-06-21 | 四川双泰车轮有限公司 | Spoke type light alloy wheel for motorcycle and production technology thereof |
| CN2705324Y (en) * | 2004-06-03 | 2005-06-22 | 张德明 | Durable wheel inserted with steel inner sleeve |
| DE102005009326B4 (en) * | 2005-02-21 | 2007-01-04 | Technische Universität Bergakademie Freiberg | Method and pouring device for the production of micro castings |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102441657A (en) * | 2010-10-12 | 2012-05-09 | 通用汽车环球科技运作有限责任公司 | Bimetallic casting |
| CN102441657B (en) * | 2010-10-12 | 2016-11-09 | 通用汽车环球科技运作有限责任公司 | The method forming foundry goods |
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| CN101767272B (en) | 2012-03-21 |
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