CN1138105A - Aluminum alloy processing superior strength and workability for use in forming fin, and manufacturing method for same - Google Patents

Abstract

The invention provides an aluminum alloy comprising: 0.10-0.90% by weight of Si, 0.10-1.0% by weight of Mn, at least one of 0.05-0.20% by weight of Cu and 0.05-20% by weight of Mg, at least one of 0.01-0.10% weight of Zr and 0.01-0.10% weight of Ti, and a remaining portion comprising unavoidable impurities. The invention provides a method for manufacturing an aluminum alloy thin plate for use in forming a fin member possessing superior strength and formability, comprising manufacturing a thickness of 1-15 mm band-shaped plate, cold-rolling the plate and conducting a temp. annealing process while maintaining a temp. of 200-400 deg.C. Furthermore 0.001-0.02% by weight of Y may be also added to the aluminum alloy of the invention and manufacturing method.

Description

Radiator element aluminium alloy and manufacture method thereof that intensity and processing characteristics are good

The present invention relates to a kind of aluminium alloy, be used for being formed in such as the standard room with the diffusion sheet that uses in the heat exchangers such as conditioner.More particularly, the present invention relates to be used for the aluminium alloy and the manufacture method thereof of Aluminium Alloy Plate, described thin plate has the eyelet that adds hoop, wherein inserting and be used for the pipe of the refrigerant that uses in the circulation heat exchanger, this eyelet has constituted a fastening piece, and above-mentioned pipe then is in to pass and adds the state that binds round eyelet.

Usually, the heat exchanger that uses in conditioner or allied equipment in the room of standard, all adopt by thickness of slab to be about the thin plate that the aluminum or aluminum alloy of 0.1-0.2mm constitutes, fixing above by suppressing many diffusion sheets that the hoop eyelet forms and metal tubes that are used for the circulating frozen agent of adding.

Similarly, according to routine techniques, the aluminium alloy that is used for forming this diffusion sheet needs high formability, erosion resistance and intensity.In order to reach above-mentioned requirements, for example can adopting, the clear 63-53477 of Japanese patent application (announces for the second time, be published as for the first time clear 55-17072), the clear 62-54181 of Japanese patent application (announces for the second time, be published as for the first time clear 57-19351) in the specification sheets that waits disclosed composition or manufacture method through suitably regulating the alloy of formation, thereby can obtain the required high formability of diffusion sheet processing, keep the desired intensity of heat exchanger simultaneously again.

In the clear 63-53477 of above-mentioned Japanese patent application (announce for the second time), a kind of aluminium alloy that is used for constituting the diffusion sheet element is disclosed, wherein contain 0.1-2.0% Mn ,≤0.5% Fe ,≤0.2% Cu ,≤0.4% Si and≤0.5% Mg.

In addition, identical file also discloses a kind of method, and wherein the melt of the aldural that will be made of above-mentioned composition with the Strip casting method is made the stripe board that forward thickness is 3-10mm, the cold rolling one-tenth thickness of this stripe board is about the thin plate of 0.15mm, then with formed thin plate annealing.

On the other hand, in the clear 62-54181 of Japanese patent application (announcing for the second time), disclose and a kind ofly alloy melt has been made the method that thickness is the band shape plate of 3～15mm with the Strip casting method, this alloy melt contains 0.10～1.0%Mn, 0.10～0.90%Si, 0.01～0.1%Ti, be equivalent to 10～20% the B of above-mentioned Ti, all the other are aluminium basically, and wherein Mn and the ratio of Si are in 0.5～1.5 scope.After above-mentioned band shape plate is cold rolling, formed sheet material is annealed down at 200～400 ℃.

According to disclosed technology in the above-mentioned file, can obtain thickness and be about 0.1～0.2mm, and have the Aluminium Alloy Plate of good intensity, formability and erosion resistance.

But along with the progress of heat exchanger designs technology, the heat exchanger structure that become is compact more and weight is lighter in recent years, to adapt to the needs that reduce cost.Therefore, need a kind of material thinner, form the diffusion sheet that uses in the above-mentioned heat exchanger than normally used aluminium alloy.So, growing to the demand of thickness of slab 0.1mm or thinner thin plate; But for the thin aluminum sheet that obtains with above-mentioned technology, thickness of slab is difficult to the intensity that reaches enough during less than 0.1mm.In addition, even reaching under the situation of sufficient intensity, yet exist the tendency that the other problem relevant occur with processing characteristics.

In other words, in general, when attempting to satisfy the requiring of above-mentioned reduction thickness of slab, formability and intensity can have problems.The formability of known materials is relevant with thickness of slab; Therefore, for the aluminium alloy of routine, take place easily to reduce because of thickness of slab reduces (attenuation), partly produce problems such as crack in the stretch forming part and in the fissured stretch flanging of supporting such as formability.In addition, the intensity of the product after the processing reduces with thickness basically and correspondingly reduces, thereby causes producing defective, for example in the heat exchanger manufacturing processed and/or the possibility of distortion arranged during the carrying of product after finishing.

Consider the problems referred to above, one of purpose of the present invention provides a kind of aluminium alloy, wherein contains: the Si of 0.10～0.90% weight; 0.10 the Mn of～1.0% weight; 0.05 it is at least a among the Mg of the Cu of～0.20% weight and 0.05～0.20% weight; 0.01 it is at least a among the Ti of the Zr of～0.10% weight and 0.01～0.10% weight; And unavoidable impurity.

In addition, the invention provides a kind of aluminium alloy, wherein contain: the Si of 0.10～0.90% weight; 0.10 the Mn of～1.0% weight; 0.05 at least a among the Mg of the Cu of～0.20% weight and 0.05～0.20% weight; 0.01 at least a among the Ti of the Zr of～0.10% weight and 0.01～0.10% weight; 0.001 the Y of～0.02% weight; And unavoidable impurity.

Moreover, according to the present invention, providing a kind of manufacture method that is used to constitute the Aluminium Alloy Plate of diffusion sheet element, this alloy has good intensity and formability, and described method is characterised in that and may further comprise the steps:

With the Strip casting method aluminium alloy melt of above-mentioned composition is made the band shape plate that thickness is 1～15mm;

Should be with the shape plate cold rolling; With

It is under 200～400 ℃ keeping temperature, makes with extra care annealing processing.

Explained later is with each composition qualification reason as above.

Mn has the effect that improves the weight crystal temperature owing to forming sosoloid with matrix, in addition owing to the effect that has strengthened above-mentioned sosoloid has improved intensity.But,, do not produce above-mentioned effect when Mn content during less than 0.10% weight; And when content surpasses 1.0% weight, the formability variation.Therefore, Mn content is defined as 0.1～1.0% weight.When coexisting with Mn, Si plays a part to improve intensity and formability (particularly pultrusion process).When Si content during, do not produce above-mentioned effect less than 0.10% weight; On the other hand, Si content can cause erosion resistance and formability to reduce above 0.90% weight.Therefore, Si content is defined as 0.10～0.90% weight.

In addition, two kinds of elements of Cu and Mg can improve intensity and not reduce formability.But any one in them all do not observe above-mentioned effect during less than 0.05% weight at content; Cu content surpasses 0.20% and can cause erosion resistance to reduce, and Mg content can make the formability variation above 0.20%.Therefore, their content all is defined as 0.05%～0.20%.

Zr and Ti produce the effect that improves grain size respectively, and this can cause the improvement of formability again.But any one in them all do not observe above-mentioned effect during less than 0.01% weight at content; On the other hand, content surpasses 0.10% weight and can cause coarse-grained intermetallics to form, and it can make formability reduce.Therefore, the content of Zr and Ti all is defined as 0.01～0.10% weight.

When coexisting with Zr or with Ti, Y with the corresponding specific region of Y add-on shown in Figure 1 in, the recrystallization temperature by further raising Aluminium Alloy Plate improves intensity.In addition, owing to improved recrystallization temperature in a manner described, the annealing of above-mentioned Aluminium Alloy Plate-softening curve is stablized, and this itself can make final temper annealing process carry out easily again.But, when Y content is less than 0.001% weight, can not get above-mentioned effect, and the Y that adds more than 0.02% can not improve The above results effectively.Therefore, consider that Y element is somewhat expensive, its content is defined as 0.001～0.02% weight.

To explain the manufacture method of above-mentioned materials in detail below.Strip casting method as the alloy melt of mentioned component can adopt a kind of like this method, utilizes a jet pipe that is arranged between two rollers that use in the band casting in the method, sprays the aluminium alloy melt of mentioned component, then cools off with rolling mould.Also can make the casting of above-mentioned materials and rollingly carry out simultaneously.According to this method, Mn is compulsorily entered into sosoloid, and this makes the thin plate with superior strength and processing characteristics be able to final formation again.The thickness of the nervous sheet material that makes with above-mentioned made-up belt continuous processing is 1～15mm, and this is necessary for cold rolling attenuate, and considers from the performance of the finished product, must carry out cold rolling.In addition, with regard to cost, aforesaid method is in applicable scope.

Casting speed when carrying out Strip casting (rate of advance of band shape plate) is preferably 0.8～20m/min, and melt temperature is preferably 680～710 ℃.In addition, except the aforesaid method that adopts transfer roller, adopt other Strip casting method of belt press, moulding press etc. also can use.

Above-mentioned cold-rolling practice can be carried out according to any standard method of using in making thin aluminum sheet.Guarantee that preferably cold rolling attenuate is 90% or more, need not thermal treatment during rolling.

Subsequently, carry out temper annealing processing, can obtain desirable intensity and workability by material to cold rolling mistake.But when said temperature is lower than 200 ℃ of amounts, workability can not have sufficient improvement, and when attempting at the annealing temperature more than 400 ℃, intensity sharply descends, and also variation of formability.In addition, with regard to the mechanical properties after the annealing, the ratio (being σ Y/ σ B) of yield strength (σ Y) and tensile strength (σ B) is preferably in 0.90～0.95 scope.Therefore, though the ideal annealing temperature is also relevant with composition, specifying the temper annealing temperature is 200～400 ℃.

Fig. 2 has represented to be equipped with the example of the heat exchanger of the diffusion sheet that forms with alloy of the present invention.In this embodiment, the thin plate that makes with above-mentioned manufacture method is press process and squeezes and draw processing, form add hoop eyelet 2 to constitute thin plate 3, pass eyelet 2 and plug and be used for the copper body 1 of circulating frozen agent.Pass each eyelet 2 that on thin plate 3, forms and all plug above-mentioned body 1, so that constitute heat exchanger A.In addition, all form a cranse 2a, in this way, body 1 stably is bearing on the above-mentioned cranse 2a at each eyelet 2 opening part.The thickness of above-mentioned thin plate 3 is about 0.1mm, even also more lower slightly than this size.

In the heat exchanger A that constitutes as mentioned above,, need the thin plate 3 of reduced thickness in order to satisfy compact construction and lightweight requirement; Therefore, formed this thickness is about 0.1mm or thin slightly.

If the thin plate that forms in a manner described 3 lacks enough intensity, then during making above-mentioned heat exchanger A, deform easily.In this regard, when thin plate that the aluminium alloy that uses above-mentioned manufacture method by mentioned component forms, good tensile strength, yield strength and elongation have been obtained.Therefore, in press process and/or squeeze draw processing during, the thin plate that is used for making heat exchanger A can not sustain damage.In addition, even in big part of degree of finish (as cranse 2a) or the easy part of concentrating of machining stress, do not produce crack and/or damage yet.

Moreover, in the above-described embodiments, explained that thin plate 3 has the reason that has adopted shape shown in Figure 2 of the present invention; But the present invention is not limited to shape shown in Figure 2, because thin plate 3 can have shape miscellaneous according to the heat exchanger that it is used for.

Fig. 1 is the sketch that concerns between the expression add-on of Y and the anti-annealing-property of softening.

Fig. 2 is the oblique drawing that is used for forming the Aluminium Alloy Plate of the radiator element of making by the inventive method.

Below the aluminium alloy melt that comprises various compositions shown in the table 1 and 3, make with the Strip casting method with strip caster, this strip caster utilizes roll to form the plate of thickness of slab 6mm.With the thin plate of the cold rolling one-tenth thickness of each plate 0.10mm, then anneal at various temperatures then.Then every kind of sample is carried out test for tensile strength and formability test with actual press.

The evaluation result of above test sample is listed in table 2 and the table 4, as seen from the above table, be different from each comparative examples of the present invention with composition and manufacture method and compare, Aluminium Alloy Plate constructed in accordance demonstrates higher intensity and uses the good formability of actual press.

As mentioned above, according to the present invention, can provide a kind of Aluminium Alloy Plate with superior strength and formability in a kind of cost-effective mode, it is used for the attenuate of fin material easily, so that be used in the heat exchanger of standard room with conditioner.Therefore, industrial value of the present invention is very high.

Table 1

		??Mn	??Si	??Cu	??Mg	??Ti	??Zr	Annealing temperature ℃	Characteristics
										Example of the present invention	1	?0.35	?0.40	?0.07	??-	?0.02	??-	????270	Strip casting
2	?0.40	?0.20	??-	?0.15	?0.01	?0.03	????290	Strip casting
									3		?0.60	?0.41	?0.06	?0.07	?0.02	??-	????340	Strip casting
Case of comparative examples	1	?0.34	?0.08 *	?0.10	??-	?0.02	??-	????280											Strip casting
									2	??-	?0.15	??-	?0.17	??-	?0.04	????250	Strip casting
	3	?0.45	?0.20	??-	?0.17	?0.03	??-	????240										Hot rolling
									4	?0.35	?0.40	?0.07	??-	?0.02	??-	????180	Strip casting
	5	?0.35	?0.40	?0.07	??-	?0.02	??-	????420										Strip casting
									6	?0.40	?0.20	??-	?0.15	?0.01	?0.03	????180	Strip casting
	7	?0.40	?0.20	??-	?0.15	?0.01	?0.03	????420										Strip casting
									8	?0.40	?0.09	??-	?0.15	?0.01	?0.03	????290	Strip casting
	9	?0.40	?1.00	??-	?0.15	?0.01	?0.03	????290										Strip casting

Table 2

		Tension test			Actual press process test
						Tensile strength (MPa)	Yield strain intensity (MPa)	Extensibility (%)
		The embodiment of the invention	????1	????150					????140	????9.8	????0
????2	????155				????143	????10.1	????0
			????3	????165				????150	????11.3	????0
Comparative examples	????1				????140	????131	????8.4				????△ *
		????2	????127	????110				????7.5	????× *
	????3				????148	????138	????6.9			????× **
		????4	????225	????220				????3.5	????× **
	????5				????88	????54	????4.2			????×
		????6	????230	????225				????3.0	????× **
	????7				????92	????60	????3.8			????×
		????8	????145	????130				????8.6	????× *
	????9				????152	????143	????8.4			????△ **

^*Produce draw crack

^*Produce the flange crack

Table 3

		?Mn	?Si	?Cu	?Mg	??Ti	?Zr	??Y	Annealing temperature ℃	Characteristics
											Example of the present invention	4	?0.35	?0.40	?0.07	??-	?0.02	??-	?0.01	????270	Strip casting
5	?0.40	?0.20	??-	?0.15	?0.01	?0.03	?0.015	????290	Strip casting
										6		?0.60	?0.41	?0.06	?0.07	?0.02	??-	?0.02	????340	Strip casting
Case of comparative examples	10	?0.34	?0.08 *	?0.10	??-	?0.02	??-	?0.015	????280												Strip casting
										11	??-	?0.15	??-	?0.17	??-	?0.04	?0.015	????250	Strip casting
	12	?0.45	?0.20	??-	?0.17	?0.03	??-	?0.015	????240											Hot rolling
										13	?0.35	?0.40	?0.07	??-	?0.02	??-	?0.015	????180	Strip casting
	14	?0.35	?0.40	?0.07	??-	?0.02	??-	?0.015	????420											Strip casting
										15	?0.40	?0.20	??-	?0.15	?0.01	?0.03	?0.015	????180	Strip casting
	16	?0.40	?0.20	??-	?0.15	?0.01	?0.03	?0.015	????420											Strip casting
										17	?0.40	?0.09	??-	?0.15	?0.01	?0.03	?0.0004	????290	Strip casting
	18	?0.40	?1.00	??-	?0.15	?0.01	?0.03	?0.0004	????290											Strip casting

Table 4

		Tension test			Actual press process test
						Tensile strength (MPa)	Yield strain intensity (MPa)	Extensibility (%)
		The embodiment of the invention	??4	????153					????143	????9.7	????0
??5	????156				????143	????10.0	????0
			??6	????165				????151	????10.7	????0
Comparative examples	??10				????141	????132	????8.0				????△ *
		??11	????131	????115				????7.5	????×*
	??12				????147	????139	????5.8			????× **
		??13	????225	????221				????2.9	????×
	??14				????95	????60	????3.8			????× **
		??15	????232	????228				????2.5	????×
	??16				????98	????71	????3.2			????× **
		??17	????144	????128				????8.4	????× *
	??18				????150	????140	????8.2			????△ **

^*Produce draw crack

^*Produce the flange crack

Claims (4)

1. the aluminium alloy that contains following composition: the Si of 0.10～0.90% weight; 0.10 the Mn of～1.0% weight; 0.05 at least a among the Mg of the Cu of～0.20% weight and 0.05～0.20% weight; 0.01 at least a among the Ti of the Zr of～0.10% weight and 0.01～0.10% weight; And unavoidable impurity.

2. the aluminium alloy that contains following composition: the Si of 0.10～0.90% weight; 0.10 the Mn of～1.0% weight; 0.05 at least a among the Mg of the Cu of～0.20% weight and 0.05～0.20% weight; 0.01 at least a among the Ti of the Zr of～0.10% weight and 0.01～0.10% weight; 0.001 the Y of～0.02% weight; And unavoidable impurity.

3. make the method for the Aluminium Alloy Plate of the diffusion sheet element be used to constitute superior strength and formability, it is characterized in that may further comprise the steps:

Aluminium alloy melt is made the band shape plate that thickness is 1～15mm with the Strip casting method, contain in this aluminium alloy melt: the Si of 0.10～0.90% weight; 0.10 the Mn of～1.0% weight; 0.05 at least a among the Mg of the Cu of～0.20% weight and 0.05～0.20% weight; 0.01 at least a among the Ti of the Zr of～0.10% weight and 0.01～0.10% weight; And unavoidable impurity;

Described band shape plate is cold rolling; With

Keeping temperature is under 200～400 ℃, makes with extra care annealing processing.

4. make the method for the Aluminium Alloy Plate of the radiator element be used to constitute superior strength and formability, it is characterized in that may further comprise the steps:

Aluminium alloy melt is made the band shape plate that thickness is 1～15mm with the Strip casting method, contain in this aluminium alloy melt: the Si of 0.10～0.90% weight; 0.10 the Mn of～1.0% weight; 0.05 at least a among the Mg of the Cu of～0.20% weight and 0.05～0.20% weight; 0.01 at least a among the Ti of the Zr of～0.10% weight and 0.01～0.10% weight; 0.001 the Y of～0.02% weight; And unavoidable impurity;

Should be with the shape plate cold rolling; With

Keeping temperature is under 200～400 ℃, makes with extra care annealing processing.

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