CN103103379B - Needle rod eccentric pin of sewing machine and manufacturing method thereof - Google Patents
Needle rod eccentric pin of sewing machine and manufacturing method thereof Download PDFInfo
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- CN103103379B CN103103379B CN201210450299.1A CN201210450299A CN103103379B CN 103103379 B CN103103379 B CN 103103379B CN 201210450299 A CN201210450299 A CN 201210450299A CN 103103379 B CN103103379 B CN 103103379B
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- eccentric pin
- needle bar
- sewing machine
- zinc alloy
- machine needle
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Abstract
The invention provides a needle rod eccentric pin of a sewing machine and a manufacturing method thereof. The needle rod guide eccentric pin is made of zinc alloy, wherein the zinc alloy comprises the following components in percentage by weight: 3.90%-4.30% of aluminum, 0.03%-0.06% of magnesium, 0.20%-0.50% of copper, not more than 0.035% of iron, not more than 0.004% of lead, not more than 0.003% of cadmium not more than 0.001% of tin, and the balance of zinc. The invention further provides the manufacturing method of the needle rod eccentric pin. The needle rod eccentric pin provided by the invention is convenient to machine and operate, less in processes, capable of improving the production efficiency, easy for realization of mechanization and automation, stable in quality and low in cost.
Description
Technical field
The invention belongs to Machining Technology field, relate to a kind of sewing machine needle bar eccentric pin and preparation method thereof.
Background technology
Needle bar is the strength member of composition Domestic multi-function sewing machine.Needle bar on industrial sewing machine adopts carbon steel or stainless steel to make, and requires that appearance surfaces process must be good, leakless, damage, burr, gets rusty and other shortcomings.The radial circularity of needle bar requires at below 0.005mm, and the straight degree of needle bar requires: between fulcrum, the deviation requirement at every 100mm and center is at below 0.01mm, and the pin hole on needle bar or needle tray portion must at below 0.05mm to the bias in axle center.Because needle bar requires better, so require very high equally as the eccentric pin of needle bar strength member, eccentric pin material conventional is at present steel.But being made of steel needle bar eccentric pin need through multi-step process, and tooling cost is high, quality is unstable.
In prior art, the sewing machine needle bar eccentric pin that steel part is made not only needs through multiple working procedure, its resistivity against fire is poor, corrosion-resistant, the present invention uses zinc alloy to make sewing machine needle bar eccentric pin, the low easy die cast of zinc alloy fusing point and fusing with die casting time do not inhale iron, do not corrode die mould, not sticking to mould, also has good normal temperature mechanical property and wear resistance in addition.Die-casting process is easy to operate, and operation is few, can enhance productivity, and is easy to realize mechanize and automatization; Pressure casting method also can process accurate eccentric pin, constant product quality, and cost is low.
Summary of the invention
The present invention is directed to existing technology and there are the problems referred to above, propose a kind of operation few, be convenient to produce in enormous quantities, and the needle bar eccentric pin that steady quality, cost are low.
The invention provides a kind of sewing machine needle bar eccentric pin, described eccentric pin is one-body molded by die casting, this eccentric pin is from top to bottom followed successively by installation portion, gasket part, eccentric pin section and cylindrical trundle section, described installation portion is regular hexagon and offers cross recess on installation portion, described installation portion, gasket part and eccentric pin section three are on same axial line, described needle bar eccentric pin material is zinc alloy, count by weight percentage, described zinc alloy comprises following component: aluminium 3.90-4.30%, magnesium 0.03-0.06%, copper 0.20-0.50%, iron is not more than 0.035%, lead is not more than 0.004%, cadmium is not more than 0.003%, tin is not more than 0.001%, all the other are zinc.
As preferably, described zinc alloy is grouped into by the one-tenth of following weight percent: aluminium 3.94%, magnesium 0.032%, copper 0.245%, iron 0.009%, and plumbous 0.0032%, cadmium 0.0018%, all the other are zinc.
As preferably, described zinc alloy is grouped into by the one-tenth of following weight percent: aluminium 4.05%, magnesium 0.040%, copper 0.325%, iron 0.015%, and plumbous 0.001%, cadmium 0.0012%, all the other are zinc.
As preferably, described zinc alloy is grouped into by the one-tenth of following weight percent: aluminium 4.15%, magnesium 0.035%, copper 0.35%, iron 0.01%, and plumbous 0.002%, cadmium 0.0015%, tin 0.0005%, all the other are zinc.
Another one object of the present invention is the preparation method providing a kind of sewing machine needle bar eccentric pin, and the method comprises the following steps:
S1, select zinc alloy material by above-mentioned weight percent, then zinc alloy melts, and obtains zinc alloy metal liquid;
S2, in above-mentioned zinc alloy metal liquid press-in die, by die cast, obtain needle bar eccentric pin blank;
S3, aftertreatment is carried out to above-mentioned blank after obtain needle bar eccentric pin;
Wherein, count by weight percentage, described zinc alloy comprises following component: aluminium 3.90-4.30%, magnesium 0.03-0.06%, copper 0.20-0.50%, iron is not more than 0.035%, and lead is not more than 0.004%, cadmium is not more than 0.003%, and tin is not more than 0.001%, and all the other are zinc.
In the preparation method of above-mentioned sewing machine needle bar eccentric pin, described temperature of fusion is 310-330 DEG C.Further preferably, described temperature of fusion is 315 DEG C.
The zinc alloy obtained within the scope of the temperature of fusion of the zinc alloy that sewing machine needle bar eccentric pin of the present invention adopts can be good at being applicable to sewing machine needle bar eccentric pin.When temperature of fusion is too high, Iron reutilization and zinc liquid react to be accelerated, and the oxidizing reaction of crucible surface generation iron generates Fe
2o
3also can react with zinc liquid Deng oxide compound chelating element and generate FeZn
13compound (cadmia), is dissolved in zinc liquid.Aluminium, magnesium elements make scaling loss burning speed accelerate, and scaling loss amount increases, and cadmia increases.In cast-iron pot, ferro element can fuse into alloy, increases the content of ferro element.Under high temperature, zinc and iron react and accelerate, and can form the grit of iron-Al intermetallic, and sewing machine needle bar eccentric pin excessive surface is worn and torn.The corresponding increase of fuel consumption simultaneously.Temperature is higher, and the thick mechanical property that causes of castings crystallization reduces.When temperature of fusion is too low, alloy flowability is poor, is unfavorable for being shaped, and affects die casting surface quality.
In the preparation method of sewing machine needle bar eccentric pin, described cast temperature is room temperature, and pressure is 95-105Mpa.Further preferably, described die casting pressure is 98Mpa.
In the preparation method of above-mentioned sewing machine needle bar eccentric pin, described aftertreatment is vibro-grinding.This vibro-grinding is the method for vibro-grinding common in existing machinery processing.
Accompanying drawing explanation
Fig. 1 is sewing machine needle bar eccentric pin structure schematic diagram of the present invention;
Fig. 2 is sewing machine needle bar eccentric pin plan structure schematic diagram of the present invention;
Fig. 3 is that sewing machine needle bar eccentric pin of the present invention looks up structural representation.
In figure, 1, installation portion; 2, gasket part; 3, eccentric pin section; 4, cylindrical trundle section; 5, cross recess 5.
Embodiment
Be below specific embodiments of the invention, technical scheme of the present invention is further described, but the present invention is not limited to these embodiments.
As shown in Figure 1, Figure 2 and Figure 3, this sewing machine needle bar eccentric pin is one-body molded by die casting, concrete structure is from top to bottom followed successively by installation portion 1, gasket part 2, eccentric pin section 3 and cylindrical trundle section 4, wherein installation portion 1 is regular hexagon and on installation portion 1, offers cross recess 5, and installation portion 1, gasket part 2 and eccentric pin section 3 three are on same axial line.
Table 1: the composition (weight percent) of embodiment 1 ~ 3 needle bar eccentric pin zinc alloy
Embodiment 1
Moiety is dropped into smelting furnace as the zinc alloy of table 1 embodiment 1, is warming up to 315 DEG C in an atmosphere and zinc alloy is fused into molten metal.Under room temperature, being entered by zinc alloy metal hydraulic pressure in the mould of existing common manufacture eccentric pin and leave standstill, is then that metal hydraulic is cast eccentric pin blank by 98Mpa at pressure.Then vibro-grinding is carried out to blank and become needle bar eccentric pin.
Embodiment 2
Moiety is dropped into smelting furnace as the zinc alloy of table 1 embodiment 2, is warming up to 325 DEG C in an atmosphere and zinc alloy is fused into molten metal.Under room temperature, being entered by zinc alloy metal hydraulic pressure in the mould of existing common manufacture eccentric pin and leave standstill, is then that metal hydraulic is cast needle bar eccentric pin blank by 103Mpa at pressure.Then vibro-grinding is carried out to blank and become needle bar eccentric pin.
Embodiment 3
Moiety is dropped into smelting furnace as the zinc alloy of table 1 embodiment 3, is warming up to 310 DEG C in an atmosphere and zinc alloy is fused into molten metal.Under room temperature, being entered by zinc alloy metal hydraulic pressure in the mould of existing common manufacture eccentric pin and leave standstill, is then that metal hydraulic is cast needle bar eccentric pin blank by 95Mpa at pressure.Then vibro-grinding is carried out to blank and become needle bar eccentric pin.
Comparative example 1
Be that starting material carry out machining and prepare needle bar, eccentric pin with steel.
Compare the needle bar eccentric pin that embodiment 1-3 and comparative example 1 make, comparative result is as shown in table 2.
The needle bar eccentric pin effect that table 2: embodiment 1-3 and comparative example 1 are made is compared
As can be seen from Table 2, the wear resisting property of the needle bar eccentric pin prepared by zinc alloy material of the present invention is good.By die cast, processing step is few, stable performance, and cost is low.
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.
Claims (9)
1. a sewing machine needle bar eccentric pin, described eccentric pin is one-body molded by die casting, this eccentric pin is from top to bottom followed successively by installation portion, gasket part, eccentric pin section and cylindrical trundle section, described installation portion is regular hexagon and offers cross recess on installation portion, described installation portion, gasket part and eccentric pin section three are on same axial line, described needle bar eccentric pin material is zinc alloy, count by weight percentage, described zinc alloy is made up of following component: aluminium 3.940-4.15%, magnesium 0.032-0.040%, copper 0.245-0.35%, iron is not more than 0.015%, lead is not more than 0.0032%, cadmium is not more than 0.0018%, tin is not more than 0.001%, all the other are zinc.
2. sewing machine needle bar eccentric pin according to claim 1, is characterized in that: described zinc alloy is grouped into by the one-tenth of following weight percent: aluminium 3.94%, magnesium 0.032%, copper 0.245%, iron 0.009%, plumbous 0.0032%, cadmium 0.0018%, all the other are zinc.
3. sewing machine needle bar eccentric pin according to claim 1, is characterized in that: described zinc alloy is grouped into by the one-tenth of following weight percent: aluminium 4.05%, magnesium 0.040%, copper 0.325%, iron 0.015%, plumbous 0.001%, cadmium 0.0012%, all the other are zinc.
4. sewing machine needle bar eccentric pin according to claim 1, is characterized in that: described zinc alloy is grouped into by the one-tenth of following weight percent: aluminium 4.15%, magnesium 0.035%, copper 0.35%, iron 0.01%, plumbous 0.002%, cadmium 0.0015%, tin 0.0005%, all the other are zinc.
5., according to a preparation method for the arbitrary described sewing machine needle bar eccentric pin of claim 1-4, the method comprises the following steps:
S1, by described in claim 1-4 any one weight percent select zinc alloy material, then zinc alloy melts, and obtains zinc alloy metal liquid, and described temperature of fusion is 310-330 DEG C;
S2, in above-mentioned zinc alloy metal liquid press-in die, by die cast, obtain needle bar eccentric pin blank;
S3, aftertreatment is carried out to above-mentioned blank after obtain needle bar eccentric pin.
6. the preparation method of sewing machine needle bar eccentric pin according to claim 5, is characterized in that: the temperature of fusion described in step S1 is 315 DEG C.
7. the preparation method of the sewing machine needle bar eccentric pin according to claim 5-6 any one, is characterized in that: the cast temperature described in step S2 is room temperature, and pressure is 95-105MPa.
8. the preparation method of sewing machine needle bar eccentric pin according to claim 7, is characterized in that: the die casting pressure described in step S2 is 98MPa.
9. the preparation method of sewing machine needle bar eccentric pin according to claim 5, is characterized in that: the aftertreatment described in step S3 is vibro-grinding.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210450299.1A CN103103379B (en) | 2012-11-04 | 2012-11-04 | Needle rod eccentric pin of sewing machine and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210450299.1A CN103103379B (en) | 2012-11-04 | 2012-11-04 | Needle rod eccentric pin of sewing machine and manufacturing method thereof |
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| CN103103379A CN103103379A (en) | 2013-05-15 |
| CN103103379B true CN103103379B (en) | 2015-07-15 |
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| CN201210450299.1A Expired - Fee Related CN103103379B (en) | 2012-11-04 | 2012-11-04 | Needle rod eccentric pin of sewing machine and manufacturing method thereof |
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| CN103981395B (en) * | 2014-05-28 | 2016-03-16 | 东莞洁澳思精密科技股份有限公司 | A kind of aluminium zinc gear box cover and preparation technology thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534304A (en) * | 2010-12-31 | 2012-07-04 | 北京有色金属与稀土应用研究所 | High-strength zinc-aluminum alloy bar and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102534304A (en) * | 2010-12-31 | 2012-07-04 | 北京有色金属与稀土应用研究所 | High-strength zinc-aluminum alloy bar and preparation method thereof |
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