CN103667791A - Presser foot fixer of sewing machine and preparation method thereof - Google Patents
Presser foot fixer of sewing machine and preparation method thereof Download PDFInfo
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- CN103667791A CN103667791A CN201310615664.4A CN201310615664A CN103667791A CN 103667791 A CN103667791 A CN 103667791A CN 201310615664 A CN201310615664 A CN 201310615664A CN 103667791 A CN103667791 A CN 103667791A
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Abstract
The invention relates to a presser foot fixer of a sewing machine and a preparation method thereof. The presser foot fixer is made of a zinc alloy, and a metal coating is plated on the surface of the zinc alloy. The zinc alloy comprises components in percentage by weight as follows: 3.80 %-4.00% of Al, 0.01%-0.04% of Mg, 1.0%-1.2% of Cu, smaller than or equal to 0.02% of Fe, smaller than or equal to 0.002% of Pb, smaller than or equal to 0.002% of Cd, smaller than or equal to 0.0008% of Sn and the balance of Zn. The preparation method comprises steps as follows: metal is melted into an alloy solution which is subjected to stirring, slagging off, stamping and die casting to obtain a presser foot fixer blank; then finish machining and vibration milling are performed, and metal Cu, Ni and Cr are electroplated in sequence on the blank surface; and finally, the blank, a button and a locating piece are assembled into the presser foot fixer of the sewing machine. The presser foot fixer of the sewing machine has the advantages of better mechanical property, abrasion resistance and corrosion resistance, higher surface quality and longer service life.
Description
Technical field
The present invention relates to a kind of sewing machine accessory and preparation method thereof, relate in particular to a kind of sewing machine cloth pressing 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 cloth pressing foot fixer belongs to special-shaped part, and working position is many, and surface quality requires high, and the bad assurance of processing quality, exists a lot of difficult problems in production.At present, China's sewing machine cloth pressing foot fixer quality with abroad compare and differ greatly, there is no in the international market competitive power, price is very low.This economic benefit that not only makes sewing machine manufacture enterprise is greatly affected, and also affects the development of the whole apparel industry of China.Therefore, improve an urgent demand of sewing machine cloth pressing foot fixer quality Shi Ge manufacturer.
Summary of the invention
The present invention is directed to the existing defect of prior art, provide a kind of mechanical property, wear resistance, erosion resistance better, the sewing machine cloth pressing foot fixer that surface quality is higher.
Above-mentioned purpose of the present invention can realize by following technical proposal: a kind of sewing machine cloth pressing foot fixer, described cloth pressing foot fixer is made by 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 cloth pressing foot fixer of the present invention selects zinc alloy material to make, further accurate Al, Mg, the content of Cu in zinc alloy, improve the erosion resistance of alloy, weaken the detrimentally affect of detrimental impurity, suppress the intergranular corrosion of alloy, and further control detrimental impurity Fe, Pb, Cd, the Sn content in zinc alloy, thereby castability, mechanical property, wear resistance, erosion resistance of zinc alloy etc. have effectively been improved.In addition, the present invention, at zinc alloy surface plated metal coating, further improves its corrosion resistance nature and mechanical property with this.
Al can improve the castability of alloy, increases the mobility of alloy, and 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 3.8% zinc alloy mobility, 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% to reach maximum value at Al content, but Al content is while surpassing 4.5%, and shock strength sharply declines, and when Al content is 6%, shock strength drops to minimum value.Visible, when Al content is controlled to 4.0% left and right, the mobility of alloy and mechanical property can be simultaneously in optimum regimes.This is to be 387 ℃ because contain the alloy melting point of Al4%, crystallization range is 5 ℃, under die casting condition of fast cooling, there is mutually a kind of metastable condition in the α phase in alloy structure, β phase and γ, there is thin grain structure, thereby make alloy there is best tensile strength, hardness and impelling strength.The die casting of this alloy production is when room temperature, and the final size variation causing 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 its upper layer oxidation, causes binding force of cladding material to decline.In alloy, Al content is too low, can affect again the toughness of part, is prone to fracture in use procedure.In sum, the Al content in sewing machine cloth pressing foot fixer material zinc alloy of the present invention is controlled in 3.8-4.0% model circle, and it is best that sewing machine cloth pressing foot fixer performance reaches.
In alloy, adding appropriate Cu can increase hardness and the intensity of alloy, improves wear resistance and the solidity to corrosion of alloy, weakens the detrimentally affect of detrimental impurity, suppresses the intergranular corrosion of alloy.This is mainly because the adding of Cu, improved aluminium at β the solid solubility in mutually, reduced 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, can make β separate out mutually from α with particulate state, the corrosion penetrating velocity that slows down, thereby passivation α phase.Exactly because these special roles of Cu, thus the hardness of alloy improved, intensity and impact property, and these performances increase with the increase of Cu content within the specific limits.In die casting production process, containing the alloy pressuring casting of Cu, can obtain cooling fast, thereby can suppress separating out of ε phase, produce the foundry goods that size is comparatively stable.But when room temperature, separating out of ε phase is slow, the cycle is long, finally will cause the unstable of foundry goods shape.Improve temperature and can significantly accelerate this dimensional change.Therefore,, when using containing Cu zinc die casting alloys, containing Cu amount maximum, can not surpass 1.25%.When being greater than 1.25% containing Cu amount, even when room temperature, what in die casting tissue, ε mutually will be a large amount of separates out, and this can cause the quick variation of casting dimension.So the Cu content in sewing machine cloth pressing foot fixer material zinc alloy of the present invention is controlled in 1.0-1.2% model circle, it is best that sewing machine cloth pressing foot fixer performance reaches.
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, refinement alloy structure, suppresses the transformation of β phase, thereby increases the intensity of alloy, and the creep property of alloy is also greatly improved.Mg improves one of more effective element of aluminium zinc solidity to corrosion, is mainly that Mg can suppress the intergranular corrosion that Pb causes, can obviously weaken harmful degree of impurity.But too high Mg, not only can fall low-alloyed mobility, but also can cause hot-short.Therefore, in sewing machine cloth pressing foot fixer of the present invention, the add-on of Mg is controlled within the scope of 0.03-0.04%.
In zinc die casting alloys, common impurity mainly contains Fe, Pb, Cd, Sn etc.When the fusing point of zinc alloy, the solid solubility of Fe only approximately 0.001%.Pure zinc has very easily the tendency with Fe chemical combination, and when Fe is 0.018%, eutectic reaction occurs for Zn and Fe, and Fe can obviously improve recrystallization temperature and the hardness of Zn.And the restraining effect of 4% Al, greatly weakens the chemical combination tendency of Zn and Fe in zinc alloy.Fe tends to form intermetallic platform thing FeAl with Al chemical combination
3, causing alloy casting degradation, mechanical property degenerates.Corrosion resistance reduces, and foundry goods produces hard spot, affects post-treatment and polishing.Therefore, sewing machine cloth pressing foot fixer of the present invention is controlled at Fe content below 0.02%, at utmost reduces the impact on cloth pressing foot fixer performance.
Pb, Cd, Sn are also the impurity elements in zinc alloy, the intergranular corrosion of zinc alloy are become very responsive, have accelerated the intergranular corrosion of itself under room temperature, wet environment, reduce mechanical property, and cause that casting dimension changes.Pb dissolves hardly in pure zinc, but is present in mutually on crystal boundary and dentrite interface as independent, accelerates the intergranular corrosion of alloy, and foundry goods volume and size are changed.And when Cd content surpasses certain limit in zinc alloy, can cause and the red brittleness of alloy reduce corrosion resistance.And, Pb, Cd too high levels, the sewing machine cloth pressing foot fixer after die cast was at room temperature deposited after for some time, and surface there will be bubbling.In impurity element, Sn separately exists on crystal boundary, except producing intergranular corrosion, also can cause red brittleness, reduces shock strength, and therefore, the existence of Sn is more harmful than Pb and Cd.So sewing machine cloth pressing foot fixer of the present invention is further controlled the content of impurity element Pb, Cd, Sn, Pb is controlled at below 0.002%, Cd controls below 0.002%, and Sn is controlled at below 0.0008%, thereby improves the performance of sewing machine cloth pressing foot fixer.
As preferably, described zinc alloy is grouped into by the one-tenth of following weight percent: Al:3.80%, and Mg:0.01%, Cu:1.2%, Fe:0.01%, Pb:0.001%, Cd:0.001%, Sn:0.0005%, surplus is Zn.
As preferably, described zinc alloy is grouped into by the one-tenth of following weight percent: Al:3.90%, and Mg:0.02%, Cu:1.1%, Fe:0.02%, Pb:0.002%, Cd:0.002%, Sn:0.0008%, surplus is Zn.
As preferably, described zinc alloy is grouped into by the one-tenth of following weight percent: Al:4.00%, and Mg:0.04%, Cu:1.0%, Fe:0.003%, Pb:0.0003%, Cd:0.0003%, Sn:0.0002%, surplus is Zn.
As preferably, the metal plating of described zinc alloy surface is comprised 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 cloth pressing foot fixer of the present invention is first at zinc alloy surface plating one deck Cu, and Cu coating is closely careful, is combined firmly with matrix, can form good protective layer.And then on Cu coating, electroplate one deck preservative coat Ni layer, and 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, can effectively improve the mechanical property of sewing machine cloth pressing foot fixer.
As preferably, the thickness of described zinc alloy surface metal plating Cu is 8-12 μ m, and the thickness of metal plating Ni is 8-10 μ m, and the thickness of metal plating Cr is 0.3-1 μ m.Cu coating is too thin, the diffusion layer that Cu and matrix form 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, make zinc impurity sneak into nickel plating solution, cause nickel plating fault, but also can make to produce stain or striped on nickel coating, have a strong impact on electroplating quality.And coating Ni gauge control of the present invention is at 8-10 μ m, otherwise easily there is sudden and violent skin phenomenon in cloth pressing foot fixer.
Another object of the present invention is to provide the preparation method of above-mentioned sewing machine cloth pressing foot fixer, and described preparation method comprises the following steps:
S1: add aluminium, zinc, copper heat fused by the weight percent of above-mentioned each moiety of zinc alloy in electric furnace, be all pressed into magnesium with bell jar after fusing, after magnesium melts completely, stir alloy solution, skim after standing 5-10min;
S2: above-mentioned molten metal is carried out to punching press die casting, obtain sewing machine cloth pressing foot fixer blank;
S3: above-mentioned blank is carried out to precision work, vibro-grinding, and on blank surface plated metal Cu, Ni and Cr successively;
S4: the blank after above-mentioned processing, button and positioning element are assembled into the finished product sewing machine cloth pressing foot fixer.
Sewing machine cloth pressing foot fixer of the present invention adopts punching press die casting, and punching press die casting is easy to operate, and operation is few, can enhance productivity, and be easy to realize mechanize and automatization; Sewing machine cloth pressing foot fixer steady quality prepared by this method, cost is low.And the present invention is and the interpolation time of appropriate design alloy material interalloy element first adds aluminium, zinc, copper, makes aluminium that copper-clad is held to rear melting, avoid copper oxidized, then add magnesium, because the fusing point of magnesium is lower, adds too early membership and cause the oxidized or scaling loss of magnesium alloy element.
As preferably, in described step S1, heat fused temperature is 360-400 ℃.Temperature of fusion is higher, and the thick mechanical property that causes of sewing machine cloth pressing foot fixer crystallization reduces, and consumes mass energy, increases cost; But when temperature of fusion is too low, alloy flowability is poor, is unfavorable for moulding, affect sewing machine cloth pressing foot fixer surface quality.Through experiment, show, temperature is controlled to the sewing machine obtaining within the scope of the present invention and press cloth pressing foot performance 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 cloth pressing 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 cloth pressing foot fixer surface quality of the present invention is good, production efficiency is high.
3. sewing machine cloth pressing foot fixer of the present invention surface is coated with metal Cu, Ni, Cr successively, forms good protective layer, improves the non-corrosibility of sewing machine cloth pressing foot fixer.
4. the sewing machine cloth pressing foot fixer overlay coating of the present invention composition that haves three layers, effectively improves the mechanical property of sewing machine cloth pressing foot fixer.
Accompanying drawing explanation
Fig. 1 is sewing machine cloth pressing foot fixer structure schematic diagram of the present invention.
As shown in the figure: 1: cloth pressing 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 embodiment.
As shown in Figure 1, sewing machine cloth pressing foot fixer of the present invention is comprised of cloth pressing foot fixer blank 1, button 2 and positioning element 3.Wherein, cloth pressing foot fixer blank 1 is made by zinc alloy diecasting moulding, and is electroplate with metal plating at zinc alloy surface.Metal plating is comprised 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 are electroplated and are formed by common electro-plating method in prior art.
Table 1 embodiment of the present invention 1-3 sewing machine cloth pressing foot each moiety of fixer and mass percent thereof
Embodiment 1:
According to 1 each moiety of embodiment in table 1 and mass percent thereof, in electric furnace, add aluminium, zinc, copper and be heated to 360 ℃ to make its fusing, all after fusing, with bell jar, be pressed into magnesium, after magnesium melts completely, stir alloy solution, after standing 10min, skim.Under the condition that is 90MPa by molten metal at pressure afterwards, carry out punching press die casting, obtain sewing machine cloth pressing foot fixer blank, then sewing machine cloth pressing foot fixer blank is carried out to precision work, vibro-grinding, and be the metal Cu of 8 μ m at sewing machine cloth pressing foot fixer blank electroplating surface thickness, on Cu, electroplating thickness is the metal Ni of 8 μ m, and on Ni layer, electroplating thickness is the Metal Cr of 0.3 μ m.Finally sewing machine cloth pressing foot fixer blank, button and positioning element after processing are assembled into the finished product sewing machine cloth pressing foot fixer.
Embodiment 2:
According to 2 each moietys of embodiment in table 1 and mass percent thereof, in electric furnace, add aluminium, zinc, copper and be heated to 380 ℃ to make its fusing, all after fusing, with bell jar, be pressed into magnesium, after magnesium melts completely, stir alloy solution, after standing 5min, skim.Under the condition that is 85MPa by molten metal at pressure afterwards, carry out punching press die casting, obtain sewing machine cloth pressing foot fixer blank, then sewing machine cloth pressing foot fixer blank is carried out to precision work, vibro-grinding, and be the metal Cu of 10 μ m at sewing machine cloth pressing foot fixer blank electroplating surface thickness, on Cu, electroplating thickness is the metal Ni of 9 μ m, and on Ni layer, electroplating thickness is the Metal Cr of 0.5 μ m.Finally sewing machine cloth pressing foot fixer blank, button and positioning element after processing are assembled into the finished product sewing machine cloth pressing foot.
Embodiment 3:
According to 3 each moietys of embodiment in table 1 and mass percent thereof, in electric furnace, add aluminium, zinc, copper and be heated to 400 ℃ to make its fusing, all after fusing, with bell jar, be pressed into magnesium, after magnesium melts completely, stir alloy solution, after standing 8min, skim.Under the condition that is 88MPa by molten metal at pressure afterwards, carry out punching press die casting, obtain sewing machine cloth pressing foot fixer blank, then sewing machine cloth pressing foot fixer blank is carried out to precision work, vibro-grinding, and be the metal Cu of 12 μ m at sewing machine cloth pressing foot fixer blank electroplating surface thickness, on Cu, electroplating thickness is the metal Ni of 10 μ m, and on Ni layer, electroplating thickness is the Metal Cr of 0.8 μ m.Finally sewing machine cloth pressing foot fixer blank, button and positioning element after processing are assembled into the finished product sewing machine cloth pressing foot.
Comparative example:
The common sewing machine cloth pressing foot fixer of buying from the market.
The sewing machine cloth pressing foot fixer that the ordinary sewing machine cloth pressing foot fixer of buying from the market and embodiment of the present invention 1-3 are prepared compares, and comparative result is as shown in table 2.
Table 2 comparative example and embodiment 1-3 sewing machine cloth pressing foot fixer comparative result
From table 2, can obtain, head sewing machine cloth pressing foot fixer mechanical property, wear resistance, erosion resistance, surface quality, stability that the present invention prepares 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 modifications or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although the present invention has been made a detailed description and has quoted as proof some specific embodiments, to those skilled in the art, only otherwise it is obvious leaving that the spirit and scope of the present invention can make various changes or revise.
Claims (9)
1. a sewing machine cloth pressing foot fixer, it is characterized in that, described cloth pressing foot fixer is made by 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:3.80-4.00%, Mg:0.01-0.04%, Cu:1.0-1.2%, Fe is 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.
2. a kind of sewing machine cloth pressing foot fixer according to claim 1, 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 cloth pressing foot fixer according to claim 1, 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 kind of sewing machine cloth pressing foot fixer according to claim 1, is characterized in that, 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%, surplus is Zn.
5. a kind of sewing machine cloth pressing foot fixer according to claim 1, is characterized in that, the metal plating of described zinc alloy surface is comprised of Cu layer, Ni layer and Cr layer, 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.
6. a kind of sewing machine cloth pressing foot fixer according to claim 1 or 5, is characterized in that, the thickness of described zinc alloy surface metal plating Cu is 8-12 μ m, and the thickness of metal plating Ni is 8-10 μ m, and the thickness of metal plating Cr is 0.3-1 μ m.
7. a preparation method for sewing machine cloth pressing 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, be all pressed into magnesium with bell jar after fusing, after magnesium melts completely, stir alloy solution, skim after standing 5-10min;
S2: above-mentioned molten metal is carried out to punching press die casting, obtain sewing machine cloth pressing foot fixer blank;
S3: above-mentioned blank is carried out to precision work, vibro-grinding, and on blank surface plated metal Cu, Ni and Cr successively;
S4: the blank after above-mentioned processing, button and positioning element are assembled into the finished product sewing machine cloth pressing foot fixer.
8. the preparation method of a kind of sewing machine cloth pressing foot fixer according to claim 7, is characterized in that, the heat fused temperature described in step S1 is 360-400 ℃.
9. the preparation method of a kind of sewing machine cloth pressing foot fixer according to claim 7, is characterized in that, the stamping pressure described in step S2 is 85-90MPa.
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| CN201310615664.4A CN103667791B (en) | 2013-11-26 | 2013-11-26 | A kind of sewing machine Presser foot fixer and preparation method thereof |
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| CN201310615664.4A CN103667791B (en) | 2013-11-26 | 2013-11-26 | A kind of sewing machine Presser foot fixer and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105420769A (en) * | 2015-12-24 | 2016-03-23 | 张颖 | Tourist souvenir furnishing article |
| CN110257669A (en) * | 2019-07-17 | 2019-09-20 | 太仓宝祥有色金属制品厂 | A kind of high-performance zinc alloy new 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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- 2013-11-26 CN CN201310615664.4A patent/CN103667791B/en not_active Expired - Fee Related
Patent Citations (1)
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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 |
Non-Patent Citations (1)
| Title |
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| 王宗雄等: "锌合金电镀与退镀", 《电镀与涂饰》, vol. 31, no. 5, 31 May 2012 (2012-05-31), pages 18 - 22 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105420769A (en) * | 2015-12-24 | 2016-03-23 | 张颖 | Tourist souvenir furnishing article |
| CN110257669A (en) * | 2019-07-17 | 2019-09-20 | 太仓宝祥有色金属制品厂 | A kind of high-performance zinc alloy new 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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