CN103667791B - A kind of sewing machine Presser foot fixer and preparation method thereof - Google Patents
A kind of sewing machine Presser foot fixer and preparation method thereof Download PDFInfo
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- CN103667791B CN103667791B CN201310615664.4A CN201310615664A CN103667791B CN 103667791 B CN103667791 B CN 103667791B CN 201310615664 A CN201310615664 A CN 201310615664A CN 103667791 B CN103667791 B CN 103667791B
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- presser foot
- sewing machine
- foot fixer
- machine presser
- zinc alloy
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Abstract
The present invention relates to a kind of sewing machine Presser foot fixer and preparation method thereof, this Presser foot fixer is made up of zinc alloy, and being coated with metal plating at zinc alloy surface, this zinc alloy is grouped into by the one-tenth of following weight percent: Al:3.80-4.00%, Mg:0.01-0.04%, Cu:1.0-1.2%, Fe is not more than 0.02%, Pb and is not more than 0.002%, Cd and is not more than 0.002%, Sn is not more than 0.0008%, and surplus is Zn.Its preparation method comprises: Metal Melting is changed into alloy solution, stir, skim, then punching press die casting is carried out, obtain Presser foot fixer blank, and carry out precision work, vibro-grinding, then at blank surface successively plated metal Cu, Ni and Cr, finally blank, button and positioning element are assembled into sewing machine Presser foot fixer, its mechanical property, wear resistance, erosion resistance are better, and surface quality is higher, and work-ing life is longer.
Description
Technical field
The present invention relates to a kind of sewing machine accessory and preparation method thereof, particularly relate to a kind of sewing machine Presser foot fixer and preparation method thereof, belong to field of mechanical technique.
Background technology
The quality of sewing machine component directly affects the performance and used life of garment sewing quality and complete machine.Sewing machine Presser foot fixer belongs to special-shaped part, and working position is many, and surface quality requirements is high, and the bad guarantee of processing quality, also exists an a lot of difficult problem in production.At present, China's sewing machine Presser foot fixer quality differs greatly compared with abroad, and do not have competitive power in the international market, price is very low.This not only makes the economic benefit of sewing machine manufacturing concern be greatly affected, and also affects the development of the whole apparel industry of China.Therefore, an urgent demand of sewing machine Presser foot fixer quality Shi Ge manufacturer is improved.
Summary of the invention
The present invention is directed to the defect existing for prior art, provide a kind of mechanical property, wear resistance, erosion resistance better, the sewing machine Presser foot fixer that surface quality is higher.
Above-mentioned purpose of the present invention realizes by following technical proposal: a kind of sewing machine Presser foot fixer, described Presser foot fixer is made up of zinc alloy, and being coated with metal plating at zinc alloy surface, described zinc alloy is grouped into by the one-tenth of following weight percent: Al:3.80-4.00%, Mg:0.01-0.04%, Cu:1.0-1.2%, Fe is not more than 0.02%, Pb and is not more than 0.002%, Cd and is not more than 0.002%, Sn is not more than 0.0008%, and surplus is Zn.
Sewing machine Presser foot fixer of the present invention selects zinc alloy material to make, accurate Al, Mg, Cu content in zinc alloy further, improve the erosion resistance of alloy, weaken the detrimentally affect of detrimental impurity, suppress the intergranular corrosion of alloy, and control the content of detrimental impurity Fe, Pb, Cd, Sn in zinc alloy further, thus effectively improve the castability, mechanical property, wear resistance, erosion resistance etc. of zinc alloy.In addition, the present invention, at zinc alloy surface plated metal coating, improves its corrosion resistance nature and mechanical property further with this.
Al can improve the castability of alloy, and increase the mobility of alloy, crystal grain thinning, causes solution strengthening, improves mechanical property.The mobility of zinc alloy reaches maximum value when Al content is 5%, and Al content is very poor lower than the zinc alloy mobility of 3.8%, and when Al content is 3%, the mobility of zinc alloy drops to minimum value, is not suitable for die casting, and tensile strength is low.Shock strength is 3.5% reach maximum value at Al content, but Al content more than 4.5% time, shock strength sharply declines, and when Al content is 6%, shock strength drops to minimum value.Visible, controlled by Al content about 4.0% time, the mobility of alloy and mechanical property can be in optimum regime simultaneously.This is because be 387 DEG C containing the alloy melting point of Al4%, crystallization range is 5 DEG C, under die casting condition of fast cooling, a kind of metastable condition is there is in the α phase in alloy structure, β phase with γ phase, there is thin grain structure, thus make alloy have best tensile strength, hardness and impelling strength.The die casting of this alloy production is when room temperature, and the final size change caused because of phase transformation is only 0.12%, and mechanical property is also without considerable change.In addition, Al too high levels in alloy, can accelerate the oxidation of its upper layer, cause binding force of cladding material to decline.When in alloy, Al content is too low, the toughness of part can be affected again, in use procedure, easily occur fracture.In sum, the Al content in sewing machine Presser foot fixer material zinc alloy of the present invention controls in 3.8-4.0% model circle, and sewing machine Presser foot fixer performance reaches best.
Add hardness and intensity that appropriate Cu can increase alloy in the alloy, improve wear resistance and the solidity to corrosion of alloy, weaken the detrimentally affect of detrimental impurity, suppress the intergranular corrosion of alloy.This mainly because adding of Cu, improves the solid solubility of aluminium in β phase, decreases the diffusion of Al along crystal boundary; Cu has higher electropotential, and the electrochemical properties difference between β phase and impurity is reduced; Cu can also suppress the eutectoid decomposition of alloy, and β phase can be made to separate out from α phase with particulate state, and slow down corrosion penetrating velocity, thus passivation α phase.Exactly because these special roles of Cu, thus improve the hardness of alloy, intensity and impact property, and these performances increase with the increase of Cu content within the specific limits.In die casting production process, the alloy pressuring casting containing Cu can obtain cooling fast, thus can suppress the precipitation of ε phase, produces the foundry goods that size is comparatively stable.But when room temperature, the precipitation of ε phase is slow, the cycle is long, finally will cause the instability of cast shape.Improve temperature and can significantly accelerate this dimensional change.Therefore, use containing Cu zinc die casting alloys time, containing Cu amount maximum can not more than 1.25%.When being greater than 1.25% containing Cu amount, even if when room temperature, the precipitation that in die casting tissue, ε phase will be a large amount of, this can cause the Rapid Variable Design of casting dimension.So the Cu content in sewing machine Presser foot fixer material zinc alloy of the present invention controls in 1.0-1.2% model circle, sewing machine Presser foot fixer performance reaches best.
Mg is another important alloying element in zinc die casting alloys.Its solid solubility in zinc levels off to zero.Can form hard and crisp compound with zinc, refining alloy tissue, suppress the transformation of β phase, thus increase the intensity of alloy, the creep property of alloy is also greatly improved.Mg improves one of more effective element of aluminium zinc solidity to corrosion, and mainly Mg can suppress the intergranular corrosion that Pb causes, and obviously can weaken the detrimental extent of impurity.But too high Mg, not only can fall low-alloyed mobility, but also can cause hot-short.Therefore, in sewing machine Presser foot fixer of the present invention, the add-on of Mg controls within the scope of 0.03-0.04%.
Impurity common in zinc die casting alloys mainly contains Fe, Pb, Cd, Sn etc.When the fusing point of zinc alloy, the solid solubility of Fe only about 0.001%.Pure zinc have very easily with the tendency of Fe chemical combination, when Fe is 0.018%, there is eutectic reaction in Zn and Fe, and Fe can significantly improve recrystallization temperature and the hardness of Zn.And the restraining effect of the Al of 4%, makes the chemical combination of Zn and Fe in zinc alloy be inclined to and greatly weakens.Fe tends to form intermetallic platform thing FeAl with Al chemical combination
3, cause alloy casting degradation, mechanical property degenerates.Corrosion resistance reduces, and foundry goods produces hard spot, affects post-treatment and polishing.Therefore, Fe content controls below 0.02% by sewing machine Presser foot fixer of the present invention, at utmost reduces the impact on Presser foot fixer performance.
Pb, Cd, Sn are also the impurity elements in zinc alloy, make the intergranular corrosion of zinc alloy become very responsive, accelerate the intergranular corrosion of itself under room temperature, wet environment, reduce mechanical property, and cause casting dimension to change.Pb dissolves hardly in pure zinc, but is present on crystal boundary and dentrite interface mutually as independent, accelerates the intergranular corrosion of alloy, casting body sum size is changed.And when Cd content exceedes certain limit in zinc alloy, the red brittleness of alloy can be caused, reduce corrosion resistance.And Pb, Cd too high levels, after the sewing machine Presser foot fixer after die cast at room temperature deposits for some time, surface there will be bubbling.In impurity element, Sn then separately exists on crystal boundary, and except generation intergranular corrosion, also can cause red brittleness, reduce shock strength, therefore, the existence of Sn is more harmful than Pb and Cd.So sewing machine Presser foot fixer of the present invention controls the content of impurity element Pb, Cd, Sn further, controlled by Pb below 0.002%, Cd controls less than 0.002%, Sn and controls below 0.0008%, thus improves the performance of sewing machine Presser foot fixer.
As preferably, described zinc alloy is grouped into by the one-tenth of following weight percent: Al:3.80%, Mg:0.01%, Cu:1.2%, Fe:0.01%, Pb:0.001%, Cd:0.001%, Sn:0.0005%, and surplus is Zn.
As preferably, described zinc alloy is grouped into by the one-tenth of following weight percent: Al:3.90%, Mg:0.02%, Cu:1.1%, Fe:0.02%, Pb:0.002%, Cd:0.002%, Sn:0.0008%, and surplus is Zn.
As preferably, described zinc alloy is grouped into by the one-tenth of following weight percent: Al:4.00%, Mg:0.04%, Cu:1.0%, Fe:0.003%, Pb:0.0003%, Cd:0.0003%, Sn:0.0002%, and surplus is Zn.
As preferably, the metal plating of described zinc alloy surface is made up of Cu layer, Ni layer and Cr layer, and wherein, described Cu layer is plated in zinc alloy outside surface, and Ni layer is plated in Cu layer outside surface, and Cr layer is plated in Ni layer outside surface.Sewing machine Presser foot fixer of the present invention first plates one deck Cu at zinc alloy surface, and Cu coating is closely careful, is combined firmly, can forms good protective layer with matrix.And then on Cu coating, electroplate one deck preservative coat Ni layer, last re-plating one deck ornament layer Cr layer, and Cr layer and Ni layer can play anticorrosion synergistic effect.In addition, the metal plating that Cu layer, Ni layer and Cr layer combine, effectively can improve the mechanical property of sewing machine Presser foot fixer.
As preferably, the thickness of described zinc alloy surface metal plating Cu is 8-12 μm, and the thickness of metal plating Ni is 8-10 μm, and the thickness of metal plating Cr is 0.3-1 μm.Cu coating is too thin, the diffusion layer that Cu and matrix are formed has the phenomenons such as floating, obviously affect coat binding strength, also can make zinc alloy diecasting in acidic Ni plating bath, in electroplating process, make matrix be subject to erosion, zinc impurity is made to be mixed into nickel plating solution, cause nickel plating fault, but also can make nickel coating produces stain or striped, have a strong impact on electroplating quality.And coating Ni gauge control of the present invention is at 8-10 μm, otherwise sudden and violent skin phenomenon easily appears in Presser foot fixer.
Another object of the present invention is the preparation method providing above-mentioned sewing machine Presser foot fixer, and described preparation method comprises the following steps:
S1: add aluminium, zinc, copper heat fused by the weight percent of each moiety of above-mentioned zinc alloy in electric furnace, is all pressed into magnesium with bell jar after fusing, after magnesium melts completely, stirs alloy solution, skims after leaving standstill 5-10min;
S2: above-mentioned molten metal is carried out punching press die casting, obtains sewing machine Presser foot fixer blank;
S3: above-mentioned blank is carried out precision work, vibro-grinding, and at blank surface successively plated metal Cu, Ni and Cr;
S4: the blank after above-mentioned process, button and positioning element are assembled into the finished product sewing machine Presser foot fixer.
Sewing machine Presser foot fixer of the present invention adopts punching press die casting, and punching press die casting operation is convenient, and operation is few, can enhance productivity, and is easy to realize mechanize and automatization; Sewing machine Presser foot fixer steady quality prepared by this method, cost is low.And the present invention goes back the interpolation time of appropriate design alloy material interalloy element, first adds aluminium, zinc, copper, melting after copper-clad is held by aluminium, avoid copper oxidized, then add magnesium, because the fusing point of magnesium is lower, adds membership too early and cause the oxidized or scaling loss of magnesium alloy element.
As preferably, in described step S1, heat fused temperature is 360-400 DEG C.Temperature of fusion is higher, and the thick mechanical property that causes of sewing machine Presser foot fixer crystallization reduces, and consumes mass energy, increases cost; But when temperature of fusion is too low, alloy flowability is poor, be unfavorable for shaping, affect sewing machine Presser foot fixer surface quality.Show through experiment, sewing machine pressure cloth pressing foot performance temperature being controlled to obtain within the scope of the present invention is best.
As preferably, in described step S2, stamping pressure is 85-90MPa.
The present invention has the following advantages:
1. the mechanical property such as sewing machine Presser foot fixer intensity of the present invention, hardness, impact is better, and wear resistance is good, and work-ing life is longer.
2. sewing machine Presser foot fixer surface quality of the present invention is good, production efficiency is high.
3. sewing machine Presser foot fixer surface of the present invention is coated with Ni metal, Ni, Cr successively, forms good protective layer, improves the non-corrosibility of sewing machine Presser foot fixer.
4. sewing machine Presser foot fixer overlay coating of the present invention haves three layers composition, effectively improves the mechanical property of sewing machine Presser foot fixer.
Accompanying drawing explanation
Fig. 1 is sewing machine Presser foot fixer structural representation of the present invention.
As shown in the figure: 1: Presser foot fixer blank; 2: button; 3: positioning element.
Embodiment
Be below specific embodiments of the invention, and accompanying drawings is further described technical scheme of the present invention, but the present invention is not limited to these embodiments.
As shown in Figure 1, sewing machine Presser foot fixer of the present invention is made up of Presser foot fixer blank 1, button 2 and positioning element 3.Wherein, Presser foot fixer blank 1 is shaping obtained by zinc alloy diecasting, and is electroplate with metal plating at zinc alloy surface.Metal plating is made up of Cu layer, Ni layer and Cr layer, and wherein, Cu layer is plated in zinc alloy outside surface, and Ni layer is plated in Cu layer outside surface, and Cr layer is plated in Ni layer outside surface.In metal plating, Cu layer, Ni layer and Cr layer form by Common platings method plating in prior art.
The each moiety of table 1 embodiment of the present invention 1-3 sewing machine Presser foot fixer and mass percent thereof
Embodiment 1:
In electric furnace, add aluminium, zinc, copper be heated to 360 DEG C and make it melt according to each moiety of embodiment in table 11 and mass percent thereof, be all pressed into magnesium with bell jar after fusing, after magnesium melts completely, stir alloy solution, skim after leaving standstill 10min.Be carry out punching press die casting under the condition of 90MPa afterwards at pressure by molten metal, obtain sewing machine Presser foot fixer blank, then sewing machine Presser foot fixer blank is carried out precision work, vibro-grinding, and be the Ni metal of 8 μm at sewing machine Presser foot fixer blank surface electroplating thickness, on Cu, electroplating thickness is the W metal of 8 μm, and on Ni layer, electroplating thickness is the Metal Cr of 0.3 μm.Finally sewing machine Presser foot fixer blank, button and positioning element after process are assembled into the finished product sewing machine Presser foot fixer.
Embodiment 2:
In electric furnace, add aluminium, zinc, copper be heated to 380 DEG C and make it melt according to each moiety of embodiment in table 12 and mass percent thereof, be all pressed into magnesium with bell jar after fusing, after magnesium melts completely, stir alloy solution, skim after leaving standstill 5min.Be carry out punching press die casting under the condition of 85MPa afterwards at pressure by molten metal, obtain sewing machine Presser foot fixer blank, then sewing machine Presser foot fixer blank is carried out precision work, vibro-grinding, and be the Ni metal of 10 μm at sewing machine Presser foot fixer blank surface electroplating thickness, on Cu, electroplating thickness is the W metal of 9 μm, and on Ni layer, electroplating thickness is the Metal Cr of 0.5 μm.Finally sewing machine Presser foot fixer blank, button and positioning element after process are assembled into the finished product sewing machine cloth pressing foot.
Embodiment 3:
In electric furnace, add aluminium, zinc, copper be heated to 400 DEG C and make it melt according to each moiety of embodiment in table 13 and mass percent thereof, be all pressed into magnesium with bell jar after fusing, after magnesium melts completely, stir alloy solution, skim after leaving standstill 8min.Be carry out punching press die casting under the condition of 88MPa afterwards at pressure by molten metal, obtain sewing machine Presser foot fixer blank, then sewing machine Presser foot fixer blank is carried out precision work, vibro-grinding, and be the Ni metal of 12 μm at sewing machine Presser foot fixer blank surface electroplating thickness, on Cu, electroplating thickness is the W metal of 10 μm, and on Ni layer, electroplating thickness is the Metal Cr of 0.8 μm.Finally sewing machine Presser foot fixer blank, button and positioning element after process are assembled into the finished product sewing machine cloth pressing foot.
Comparative example:
Common sewing machine Presser foot fixer commercially.
The sewing machine Presser foot fixer that general sewing machine Presser foot fixer commercially and embodiment of the present invention 1-3 prepare compared, comparative result is as shown in table 2.
Table 2 comparative example and embodiment 1-3 sewing machine Presser foot fixer comparative result
Can obtain from table 2, the head sewing machine Presser foot fixer mechanical property that the present invention prepares, wear resistance, erosion resistance, surface quality, stability are better, be more suitable for sewing machine and use, and production efficiency is high, is easy to realize industrialization.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although made a detailed description the present invention and quoted some specific embodiments as proof, to those skilled in the art, only otherwise it is obvious for leaving that the spirit and scope of the present invention can make various changes or revise.
Claims (6)
1. a sewing machine Presser foot fixer, it is characterized in that, described Presser foot fixer is made up of zinc alloy, and is coated with metal plating at zinc alloy surface, described zinc alloy is grouped into by the one-tenth of following weight percent: Al:3.80-3.90%, Mg:0.01-0.02%, Cu:1.1-1.2%, Fe are not more than 0.02%, Pb is not more than 0.002%, Cd is not more than 0.002%, Sn and is not more than 0.0008%, and surplus is Zn;
Wherein, the metal plating of described zinc alloy surface is made up of Cu layer, Ni layer and Cr layer, and described Cu layer is plated in zinc alloy outside surface, and thickness is that 8-12 μm, Ni layer is plated in Cu layer outside surface, and thickness is that 8-10 μm, Cr layer is plated in Ni layer outside surface, and thickness is 0.3-1 μm.
2. a kind of sewing machine Presser foot fixer according to claim 1, it is characterized in that, described zinc alloy is grouped into by the one-tenth of following weight percent: Al:3.80%, Mg:0.01%, Cu:1.2%, Fe:0.01%, Pb:0.001%, Cd:0.001%, Sn:0.0005%, surplus is Zn.
3. a kind of sewing machine Presser foot fixer according to claim 1, it is characterized in that, described zinc alloy is grouped into by the one-tenth of following weight percent: Al:3.90%, Mg:0.02%, Cu:1.1%, Fe:0.02%, Pb:0.002%, Cd:0.002%, Sn:0.0008%, surplus is Zn.
4. a preparation method for sewing machine Presser foot fixer, is characterized in that, described preparation method comprises the following steps:
S1: add aluminium, zinc, copper heat fused by the weight percent of each moiety of zinc alloy described in claim 1 in electric furnace, is all pressed into magnesium with bell jar after fusing, after magnesium melts completely, stirs alloy solution, skims after leaving standstill 5-10min;
S2: above-mentioned alloy solution is carried out punching press die casting, obtains sewing machine Presser foot fixer blank;
S3: above-mentioned blank is carried out precision work, vibro-grinding, and at blank surface successively plated metal Cu, Ni and Cr;
S4: the blank after above-mentioned process, button and positioning element are assembled into the finished product sewing machine Presser foot fixer.
5. the preparation method of a kind of sewing machine Presser foot fixer according to claim 4, is characterized in that, the heat fused temperature described in step S1 is 360-400 DEG C.
6. the preparation method of a kind of sewing machine Presser foot fixer according to claim 4, is characterized in that, the stamping pressure described in step S2 is 85-90MPa.
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| CN105420769A (en) * | 2015-12-24 | 2016-03-23 | 张颖 | Tourist souvenir furnishing article |
| CN110257669B (en) * | 2019-07-17 | 2021-08-06 | 太仓宝祥有色金属制品厂 | Novel high-performance zinc alloy material and preparation method thereof |
| CN112126820A (en) * | 2020-08-05 | 2020-12-25 | 百路达（厦门）工业有限公司 | Zinc alloy and manufacturing method thereof |
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| CN103103378A (en) * | 2012-11-04 | 2013-05-15 | 宁波瑞铭机械有限公司 | Worm for upper and lower shaft transmission of sewing machine and manufacturing method thereof |
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| CN103103378A (en) * | 2012-11-04 | 2013-05-15 | 宁波瑞铭机械有限公司 | Worm for upper and lower shaft transmission of sewing machine and manufacturing method thereof |
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| Title |
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| 锌合金电镀与退镀;王宗雄等;《电镀与涂饰》;20120531;第31卷(第5期);第18-22页 * |
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