CN102011027A - Lead-free free-cutting zinc alloy as well as preparation method and application thereof - Google Patents
Lead-free free-cutting zinc alloy as well as preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a lead-free free-cutting zinc alloy as well as a preparation method and application thereof. The zinc alloy comprises the following chemical compositions in percentage by weight: 5-28 percent of aluminum, 1-8 percent of copper, 0.01-0.08 percent of magnesium, 0.05-1.0 percent of bismuth, less than 0.01 percent of lead, 0.05-0.5 percent of other elements and the balance of zinc, wherein other elements are two or more of rare earth element, titanium and boron. The lead-free free-cutting zinc alloy has the advantages of dense tissue, excellent mechanical property and excellent cutting processing property, no lead or other toxic elements and no environmental pollution. Because zinc with low cost as the matrix material of the zinc alloy and the aluminum and a little amount of copper also having low cost are added, the production cost is lowered; moreover, as an alternate material of free-cutting brass alloys under the condition that copper resource is insufficient and expressive, the zinc alloy has an important value. The preparation method of the zinc alloy is stable and controllable, has high yield and is beneficial to industrial production.
Description
Technical field
The present invention relates to zinc alloy and preparation method thereof, be specifically related to a kind of lead-free free-cutting zinc alloy and its production and application.
Background technology
Zinc alloy is divided three classes simply by working method.The one, casting alloy; The 2nd, deformation zinc alloy; The 3rd, hot-dip galvanized alloy.Be divided into pressure die casting alloy, gravitational casting alloy or the like by the castmethod difference in the casting alloy.Wherein Zn-Al alloy and Zn-Cu-Ti alloy both can directly be cast, and can carry out deformation processing again, and wherein Zn-Al alloy caused once because of it has superplasticity that people paid close attention to energetically.
Tradition cutting brass alloy material, because of the copper price becomes expensive, material cost is higher, has restricted its use.Seek the free-cutting brass equivalent material, have important industrial value in today.
Seek and cut extruded zinc alloy soon, be subjected to Hesperian attention such as Great Britain and America always.Germany is giving enough attention to deformation zinc alloy (cupric deformation zinc alloy) aspect the searching brass surrogate very early.Burkhardt delivers the achievement to binary, ternary extruded zinc alloy the earliest, they develop two kinds of alloys, be Giesche ZL3 (Zn-4Al-0.5Cu-0.03Mg) and GieshZL10 (Zn-10Al-2Cu-0.03Mg), surrogate as machining brass, a kind of alloy in back is easy to extrusion molding, and have good hot workability and suitable intensity, be widely adopted abroad.In order to seek the zinc alloy of more replacement brass, Germany had also developed another zinc base alloy afterwards, be formulated to and be divided into Zn-(3.7-4.0) %Cu-(0.2-0.3) %Mg-(0.05-0.2) %Al-(0.25-0.4) %Bi, it is applied to the very strict course of processing of high speed cutting specification of quality, and in this alloy, add (0.6-0.8) %Pb and (0.02-0.5) %Ti, simultaneously Bi content is reduced half, can further improve its high-speed cutting performance.The characteristics of these alloys are that mechanical property and dimensional stability are relatively poor, and particularly extrusion molding is very difficult.
It is then less that China carries out the document and the related data of this research.ZE-1 extruded zinc alloy Zn-2.54%Cu-0.56%Mg-0.29%Al-0.052%La-0.16%Ce as inventions such as the Xiao of Central South University Xian, but the author admits that also this product processing technique is still unstable, and yield rate is lower, tissue and performance have much room for improvement, especially cutting ability.Having is exactly the zinc-base alloy wire or the bar manufacture method of the high-intensity high-tenacity that proposes of Ningbo Powerway Group Co., Ltd again, also only relates to a kind of production technique, and also only is the zinc alloy of aluminum content 〉=10% at alloy.
In addition, bibliographical information is arranged also, following table indication material also can be used as extruded zinc alloy:
Table 1 extruded alloy typical composition
But the listed composition material of last table does not have good cutting ability.
Therefore develop the good easy cutting zinc alloy that has the good mechanical performance simultaneously of a kind of cutting ability, and provide a kind of stably manufactured technology of easy realization to be even more important.
Summary of the invention
The objective of the invention is to mechanical property and the relatively poor problem of dimensional stability lower according to the production cost height, production technique instability, the yield rate that exist in existing zinc alloy and preparation method thereof, zinc alloy product, a kind of lead-free free-cutting zinc alloy is provided, this alloy has excellent mechanical property and machinability, and is raw materials used cheap.
Another purpose of the present invention is to provide the preparation method of above-mentioned lead-free free-cutting zinc alloy.
A further object of the invention is to provide the application of above-mentioned lead-free free-cutting zinc alloy.
Above-mentioned purpose of the present invention is achieved by the following technical programs:
A kind of lead-free free-cutting zinc alloy, the weight percent of its chemical ingredients is as follows: aluminium 5～28, copper 1～8, magnesium 0.01～0.08, bismuth 0.05～1.0, lead is less than 0.01, other element 0.05～0.5, surplus is a zinc, the mixing that described other element is rare earth element and titanium or the mixing of rare earth element and boron or rare earth element, titanium and boron three's mixing.
Lead-free free-cutting zinc alloy preferred ingredient one of the present invention following (weight percent): aluminium 6～13, copper 2～5, magnesium 0.03～0.06, bismuth 0.3～0.6, lead is less than 0.01, other element 0.05～0.5, surplus is a zinc.
Lead-free free-cutting zinc alloy preferred ingredient two of the present invention following (weight percent): aluminium 14～19, copper 2～5, magnesium 0.02～0.05, bismuth 0.1～0.4, lead is less than 0.01, other element 0.05～0.5, surplus is a zinc.
Lead-free free-cutting zinc alloy preferred ingredient three of the present invention following (weight percent): aluminium 21～27, copper 2～4, magnesium 0.01～0.03, bismuth 0.1～0.4, lead is less than 0.01, other element 0.05～0.5, surplus is a zinc.
As a kind of preferred version, in the above-mentioned lead-free free-cutting zinc alloy, can also comprise that weight percentage is 0.05～0.25 manganese.
It is as follows that the present invention adds each element interaction:
Aluminium: by Zn-Al binary alloy phase diagram (Fig. 3) as can be known, Al can dissolve a large amount of Zn and form αGu Rongti.The α of rich aluminium is hard strong phase mutually, especially in solid solution behind a large amount of zinc, make the intensity of αGu Rongti higher.So along with the increase that contains the Al amount, sosoloid quantity increases, solid solution strengthening effect strengthens.The solubleness of Zn in αGu Rongti reduces along with the reduction of temperature simultaneously, and Zn is dissolved in the αGu Rongti to supersaturation in casting solidification process, has played the effect of solution strengthening.
Copper: it is exactly " wearing out " that zinc alloy in use exists a fatal shortcoming, thereby the Zn alloy has just contained Cu since coming out, because Cu not only has strengthening effect to the Zn alloy, and can also improve the anti intercrystalline corrosion ability of alloy greatly, improve the solidity to corrosion of Zn alloy, effect is remarkable.But Cu has dual character to the effect of Zn alloy, and the adding of Cu has increased the dimensional instability of alloy, and the Zn alloy that contains Cu has bigger contraction at first in the finished product heat treatment process, the marked inflation phenomenon is arranged again subsequently, so the adding of Cu must be an amount of.Under the room temperature, α mutually and β mutually in equal a spot of Cu of solubilized, when Cu content above after the solubleness (0.8wt%), then with CuZn
3Compound form occur and disperse ground is distributed on the matrix, along with containing the increase that Cu measures, the CuZn in the tissue
3Increase proper C uZn gradually mutually
3Be distributed in to the phase disperse and hinder moving of dislocation in the alloy organizing effectively, thereby intensity level is improved, simultaneously plasticity is also improved.After Cu is excessive, CuZn then
3Mutually too much, cause to connect to net, not only can not improve the performance of alloy this moment, and fragility is increased, and played opposite effect, and higher in addition copper content has increased the cost of alloy.
Magnesium: magnesium is trace element important in the zinc alloy, adds the magnesium of trace in zinc alloy, just can suppress the harmful effect of impurity element (lead, tin etc.), and the intergranular corrosion performance of zinc alloy is improved significantly, and improves the catabiosis of alloy.But the magnesium solid solution is in matrix, but its solid solubility is little, and the solid solubility of magnesium only is 0.005% under the room temperature.When Mg content is higher, in tissue, form MgZn
2Compound is distributed in crystal boundary.The effect that the adding of magnesium is played solution strengthening, improved wear resisting property and mechanical property; Simultaneously, magnesium can also prevent intergranular corrosion, reduce the damping capacity of alloy etc.
Bismuth: the low melting point element bismuth is molten hardly in zinc, aluminium, can not form low melting point mutually with zinc, aluminium, but be distributed in the matrix with free form, so bismuth adding can improve the cutting ability of zinc alloy.But too high bi content can reduce the plasticity and the toughness of the reduction alloy of alloy, and material is become fragile, the forming materials weak effect; And low excessively bi content, cutting effect is again less than improvement.
Rare earth: rare earth element mainly comprises elements such as La, Ce, Pu, and rare earth can make alloy surface tension force reduce as active element, reduce to form the needed merit of critical size nucleus, thereby the nuclei of crystallization increased, refinement crystal grain.The atomic radius of rare earth is bigger in addition, in alloy, big melting degree can not be arranged, rule according to solid solubility and intergranular absorption relation, the solid solubility little molten matter that heals, the trend that is adsorbed at crystal boundary is bigger, so rare earth is inevitable gathering on crystal boundary partially in zinc alloy, hinders grain growth, reaches the purpose of crystal grain thinning.Intensity and hardness have been improved.Simultaneously can form new hard phase, reduce the generation of viscous deformation degree and fine fisssure, the trace rare-earth element of interpolation mostly is hexagonal lattice, and the frictional coefficient of this lattice is little, and abrasion loss is few, has prolonged the work-ing life of alloy.The somebody thinks that adding rare earth element can spread detrimental impurity (electron compound), and the degree that will be harmful to is reduced to lowest range.Therefore the interpolation of rare earth be improve that zinc alloy is wear-resisting, the better additive of intensity, hardness.
Titanium, boron: after adding Ti, B, energy refinement zinc alloy crystal grain, make the optimization of alloy primary phase form simultaneously, thereby make being more evenly distributed mutually in the zinc alloy, thereby the obstruction and the destruction of crystal boundary have been significantly reduced, improve the alloy creep-resistant property, the recrystallization temperature of alloy is improved, thickization of crystal grain when avoiding high temperature to use.Owing to the refinement of crystal grain and the change of primary phase form, alloy plasticity and toughness significantly improve simultaneously, and intensity and hardness also improve.
Manganese: manganese has metamorphism, and is even add a small amount of manganese, obvious to the effect of zinc alloy structure refinement.The solid solubility of manganese in zinc and aluminium is all minimum simultaneously, and a small amount of manganese can produce a large amount of rich manganese sclerosis phases, and rich manganese mainly is distributed in crystal boundary mutually, thereby effectively hindered matrix deformation and moved, thereby improve the high-temperature mechanical property of alloy, and, can also improve its wear resisting property because the hard point increases.
The preparation method of lead-free free-cutting zinc alloy of the present invention is: prepare raw material in proportion, molten alloy, be continuously cast into alloy preform after, carry out hot extrusion, the centre is drawn into material through thermal treatment and pulling, obtains the lead-free free-cutting zinc alloy through quenching, finished product pulling, finished product thermal treatment post-treatment again.
As a kind of preferred version, the preparation method of lead-free free-cutting zinc alloy of the present invention is: prepare raw material in proportion, adopt Alloying Treatment and covering protection method molten alloy, after refining, be continuously cast into alloy preform, carry out hot extrusion, be drawn into material by intermediate heat treatment and pulling, obtain the lead-free free-cutting zinc alloy through quenching, finished product pulling, finished product thermal treatment post-treatment then; Described intermediate heat treatment and pulling are single pass or multi-pass, and every time pulling section deformation amount is controlled between 5～25%; Shrend in room temperature water during quenching.
Among the above-mentioned preparation method, the temperature of described hot extrusion is preferably 250～400 ℃; Described intermediate heat treatment temperature is preferably 200～400 ℃, and the time is preferably 1～3h; Described quenching temperature is preferably 200～400 ℃; Described finished product thermal treatment temp is preferably 100～200 ℃, and the time is preferably 20～60min.
The cost of material of lead-free free-cutting zinc alloy of the present invention is cheap, can be used as the equivalent material of cutting brass alloy, also can be applicable in Cutting Parts, forging or other processing.
Compared with prior art, the present invention has following beneficial effect:
(1) in the lead-free free-cutting zinc alloy of the present invention, owing to adopted elements such as aluminium, copper, magnesium, bismuth, rare earth, titanium, boron and manganese, make zinc alloy of the present invention have excellent mechanical property and machinability, and this alloy do not contain lead or other poisonous element, can not pollute environment;
(2) in the preparation process of lead-free free-cutting zinc alloy of the present invention, adopted extrusion molding but not casting, made the dense structure of gained zinc alloy; And this alloy has adopted cheap zinc as body material, and added cheap aluminium and a little copper of the same price, reduced production cost, under copper resource shortage, expensive situation, as the equivalent material of cutting brass alloy, have important use and be worth; Preparation method's stable and controllable of zinc alloy of the present invention, yield rate is higher, helps suitability for industrialized production.
Description of drawings
Fig. 1 is lead-free free-cutting zinc alloy of the present invention and Comparative Examples alloy cutting swarf picture, and wherein, left side figure is the cutting swarf picture of Comparative Examples 1 alloy, and middle figure is the cutting swarf picture of Comparative Examples 2 alloys, and right figure is a lead-free free-cutting zinc alloy cutting swarf picture of the present invention;
Fig. 2 is a lead-free free-cutting zinc alloy forging effect picture of the present invention;
Fig. 3 is the Zn-Al binary alloy phase diagram;
Fig. 4 is a different-alloy cutting ability comparison diagram.
Embodiment
Further explain the present invention below in conjunction with embodiment, but embodiment does not do any type of qualification to the present invention.
The lead-free free-cutting extruded zinc alloy technological process of production of the present invention is as follows among the embodiment:
------------------------intermediate heat treatment is quenched batching----finished product pulling----finished product thermal treatment----test package in pulling in hot extrusion in casting in melting.
Specifically be expressed as follows:
Prepare raw material in proportion; adopt Alloying Treatment and covering protection method molten alloy; after refining, be continuously cast into the alloy strand at 550～650 ℃; push then 250～400 ℃ of insulations; be drawn into the certain size material through intermediate heat treatment and pulling then, described pulling and thermal treatment process can be single pass or multi-pass pulling and thermal treatment, and every time pulling section deformation amount is controlled between 5～25%; intermediate heat treatment is controlled at 200～400 ℃, 1-3h.Then through quenching, the finished product pulling, finished product thermal treatment post-treatment becomes the finished product.Quench and adopt, insulation 0.5～1h, shrend in room temperature water then at 200～400 ℃; 100～200 ℃ of finished product thermal treatment temps, time 20～60min.
Lead-free free-cutting zinc alloy chemical constitution of the present invention is with reference to table 2 among the embodiment, become pole, line by above-mentioned processes, Comparative Examples is the ZE-1 zinc alloy and the national standard ZA27-2 alloy of the Xiao of Central South University Xian etc. " a kind of development of easy cutting extruded zinc alloy " invention, also is shaped by above-mentioned processes.
Table 2 Comparative Examples and embodiment alloy composition table (wt%)
Comparative Examples 1: by the strand that table 2 " ZE-1 " chemical composition is cast, through 300 ℃, the 1h insulation is squeezed into Ф 15 rods.Then through 300 ℃, 2h thermal treatment, pulling becomes Ф 14 poles behind the naturally cooling, again through 350 ℃, 0.5h take out immediately after the heating, at the normal temperature quenching-in water, pulling becomes Ф 13 poles then, at 100 ℃, the thermal treatment of 0.5h finished product makes the alloy sample code name and is " ZE-1 " then.
Comparative Examples 2: by the strand that table 2 " ZA27-2 " chemical composition is cast, through 300 ℃, the 1h insulation is squeezed into Ф 15 rods.Then through 300 ℃, 2h thermal treatment, pulling becomes Ф 14 poles behind the naturally cooling, again through 350 ℃, 0.5h take out immediately after the heating, at the normal temperature quenching-in water, pulling becomes Ф 13 poles then, at 100 ℃, the thermal treatment of 0.5h finished product makes the alloy sample code name and is " ZA27-2 " then.
Embodiment 1: by the strand that table 2 " embodiment 1 alloy " chemical composition is cast, through 300 ℃, the 1h insulation is squeezed into Ф 15mm pole then.Ф 15 poles to extruding, again through 300 ℃, 2h thermal treatment, a pulling becomes Ф 14mm rod behind the naturally cooling, then through 350 ℃, 0.5h take out immediately after the heating, at the normal temperature quenching-in water, pulling becomes Ф 13 poles then, again through 100 ℃, 0.5h finished product thermal treatment makes the alloy sample code name and is " 1 ".
Embodiment 2: by the strand that table 2 " embodiment 2 alloys " chemical composition is cast, through 280 ℃, the 2h insulation is squeezed into Ф 15mm pole then.To extruding Ф 15 bars again through 300 ℃, 2h thermal treatment, pulling becomes Ф 14mm rod behind the naturally cooling, then through 350 ℃, 0.5h take out immediately after the heating, at the normal temperature quenching-in water, pulling becomes Ф 13 poles then, at 100 ℃, the thermal treatment of 0.5h finished product makes the alloy sample code name and is " 2 " then.As different from Example 1, embodiment 2 adopts Ti, B as additive, and embodiment 1 adopts RE and Ti as additive, and extrusion temperature is also different.
Embodiment 3: with the strand of embodiment 2 alloy meltings casting, through 350 ℃ of 1h insulations, be squeezed into Ф 9.0mm dish line, through 250 ℃, 3h thermal treatment, become Ф 7.8 dish lines by continuous 2 pullings of every time deflection of 15% then, through 300 ℃, become Ф 6.9 by continuous 3 pullings of every time 8% deflection after the 2h thermal treatment, more then through 350 ℃, 0.5h take out the heating back, at the normal temperature quenching-in water, a pulling becomes the round line of Ф 6.5mm then, again through 100 ℃, 0.5h the finished product heat treatment process makes the alloy sample code name and is " 3 ".Different with embodiment 1,2 is, embodiment 3 adopts the dish line that pushes small dimension more as subjects, and through the more pulling repeatedly of multi-pass, has obtained the round line of small dimension.
Embodiment 4: by the strand that table 2 " embodiment 4 alloys " chemical composition is cast, through 350 ℃, the 1h insulation is squeezed into Ф 22mm pole then.To extruding Ф 22 bars again through 350 ℃, 1.5h thermal treatment, naturally cooling is after 3 pullings, each time pulling section deformation amount is respectively: 10%, 8%, 6% pulling becomes Ф 19.6mm rod, then through 350 ℃, taking-up immediately after the heating in 45 minutes is at the normal temperature quenching-in water.And then become Ф 19mm rod through 1 pulling, and through 120 ℃, finished product thermal treatment in 20 minutes makes the alloy sample code name and is " 4 ".Different with embodiment 1,2,3 is that embodiment 4 alloys have higher aluminium content, and extruding and the bigger specification of pulling.
Embodiment 5: by the strand that table 2 " embodiment 5 alloys " chemical composition is cast, through 350 ℃, 1h is incubated, be squeezed into Ф 15mm pole then, to pushing Ф 15 bars again through 300 ℃, 2h thermal treatment, pulling becomes Ф 14mm rod behind the naturally cooling, through 350 ℃, take out immediately after the 0.5h heating, then at the normal temperature quenching-in water, pulling becomes Ф 13 poles then, at 100 ℃, finished product thermal treatment in 20 minutes makes the alloy sample code name and is " 5 " then.Different with embodiment 1,2,3,4 is that embodiment 5 alloys have higher aluminium content.
Embodiment 6: with the strand of embodiment 5 alloy meltings casting, through 350 ℃, the 1h insulation is squeezed into Ф 34mm pole, then through 300 ℃, the 1h heating, put into normal-temperature water back 1 pulling of quenching and become Ф 32mm rod, section deformation rate 12.9% is at last at 120 ℃, carried out finished product thermal treatment in 20 minutes, and made the alloy sample code name and be " 6 ".As different from Example 5, embodiment 6 adopts extruding and the bigger specification of pulling, and the intermediate heat treatment of carrying out and middle pulling process are not arranged, but a pulling becomes trimmed size after adopting direct quenching.
Performance test results:
1. mechanical property: 1～6 alloy sample test mechanical property to above-mentioned Comparative Examples ZE-1, ZA27-2 and embodiment make the results are shown in Table 3.
Table 3 different-alloy Mechanics Performance Testing result:
As known from Table 3, each parameter of lead-free free-cutting zinc alloy mechanical property of the present invention all is better than the ZE-1 alloy, and very approaching with the ZA27-2 alloy, shows that alloy of the present invention has good comprehensive mechanical performance.
2. cutting ability: adopt identical cutter, the identical cutting speed and the identical depth of cut, 1～6# alloy sample that Comparative Examples ZE-1, ZA27-2 and embodiment 1～6 are made carries out machining, with the cutting ability of comparative alloy.The signal of turning bits pattern is as table three.Picture is seen Fig. 1, and thin, short, crisp more turning bits show that this alloy has better cutting ability, are fit to High Speed Machining more.
3. forgeability: in order to observe the forge hot performance, make the Ф 15mm extruding sample of Comparative Examples ZE-1, ZE27-2, embodiment 1,2,4,5 alloys, it is long then sample to be cut into successively 15mm, respectively under 150 ℃, 250 ℃ heating conditions, compress with 60% rate of compression at axis direction, specimen length is compressed to 6cm by 15mm.Condition of surface is observed with magnifying glass in the compression back, and lead-free free-cutting zinc alloy compression of the present invention back sample is seen Fig. 2.Specimen surface does not crack is expressed as " O ", produces be expressed as " Δ " of crackle, produces be expressed as " X " of big crackle, the results are shown in Table 4.
The test of table 4 thermo compression:
Test-results shows that alloy of the present invention has good forgeability.
Claims (10)
1. lead-free free-cutting zinc alloy, the weight percent of chemical ingredients that it is characterized in that described zinc alloy is as follows: aluminium 5 ~ 28, copper 1 ~ 8, magnesium 0.01 ~ 0.08, bismuth 0.05 ~ 1.0, lead is less than 0.01, other element 0.05 ~ 0.5, surplus is a zinc, described other element be rare earth element with titanium, boron at least a mixing.
2. lead-free free-cutting zinc alloy according to claim 1 is characterized in that the weight percent of chemical ingredients of described zinc alloy is as follows: aluminium 6 ~ 13, and copper 2 ~ 5, magnesium 0.03 ~ 0.06, bismuth 0.3 ~ 0.6, lead is less than 0.01, other element 0.05 ~ 0.5, surplus is a zinc.
3. lead-free free-cutting zinc alloy according to claim 1 is characterized in that the weight percent of chemical ingredients of described zinc alloy is as follows: aluminium 14 ~ 19, copper 2 ~ 5, magnesium 0.02 ~ 0.05, bismuth 0.1 ~ 0.4, lead is less than 0.01, other element 0.05 ~ 0.5, surplus are zinc.
4. lead-free free-cutting zinc alloy according to claim 1 is characterized in that the weight percent of chemical ingredients of described zinc alloy is as follows: aluminium 21 ~ 27, copper 2 ~ 4, magnesium 0.01 ~ 0.03, bismuth 0.1 ~ 0.4, lead is less than 0.01, other element 0.05 ~ 0.5, surplus are zinc.
5. lead-free free-cutting zinc alloy according to claim 1 is characterized in that the chemical ingredients of described zinc alloy comprises that also weight percentage is 0.05 ~ 0.25 manganese.
6. the preparation method of any described lead-free free-cutting zinc alloy of claim in the claim 1 ~ 5, it is characterized in that comprising the steps: preparing in proportion raw material, molten alloy, after being continuously cast into alloy preform, carry out hot extrusion, the centre is drawn into material through thermal treatment and pulling, obtains the lead-free free-cutting zinc alloy through quenching, finished product pulling, finished product thermal treatment post-treatment again.
7. according to the preparation method of the described lead-free free-cutting zinc alloy of claim 6, it is characterized in that comprising the steps: preparing in proportion raw material, adopt Alloying Treatment and covering protection method molten alloy, after refining, be continuously cast into alloy preform, carry out hot extrusion, be drawn into material by intermediate heat treatment and pulling, obtain the lead-free free-cutting zinc alloy through quenching, finished product pulling, finished product thermal treatment post-treatment then; Described intermediate heat treatment and pulling are single pass or multi-pass, and every time pulling section deformation amount is controlled between 5 ~ 25%; Shrend in room temperature water during quenching.
8. according to the preparation method of the described lead-free free-cutting zinc alloy of claim 7, the temperature that it is characterized in that described hot extrusion is 250 ~ 400 ℃; Described intermediate heat treatment temperature is 200 ~ 400 ℃, and the time is 1 ~ 3h; Described quenching temperature is 200 ~ 400 ℃; Described finished product thermal treatment temp is 100 ~ 200 ℃, and the time is 20 ~ 60min.
In the claim 1 ~ 5 the described lead-free free-cutting zinc alloy of any claim as the application of the equivalent material of cutting brass alloy.
10. the application of the described lead-free free-cutting zinc alloy of any claim in Cutting Parts, forging or other processing modes in the claim 1 ~ 5.
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| CN105296805A (en) * | 2015-12-09 | 2016-02-03 | 周妙思 | Preparation method of easily cut and extruded zinc alloy |
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| CN105483445A (en) * | 2015-12-09 | 2016-04-13 | 周妙思 | Free-cutting extrusion zinc alloy |
| CN107699740A (en) * | 2017-10-09 | 2018-02-16 | 广州番禺于金属加工有限公司 | A kind of kirsite and preparation method thereof and key billet |
| CN109763004A (en) * | 2019-01-03 | 2019-05-17 | 北京科技大学 | A method of it significantly improves containing the degradable kirsite tissue of Fe and performance |
| CN110747375A (en) * | 2019-11-29 | 2020-02-04 | 贵州省冶金化工研究所 | Zinc alloy and manufacturing method thereof |
| CN111575533A (en) * | 2020-06-23 | 2020-08-25 | 广东省材料与加工研究所 | Zinc-aluminum alloy round ingot, preparation method and application thereof, and zinc-aluminum alloy material |
| CN114645157A (en) * | 2022-03-11 | 2022-06-21 | 山东省科学院新材料研究所 | Soluble zinc alloy and preparation method thereof |
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