CN102277518A - Zinc alloy electric valve worm gear and manufacturing method thereof - Google Patents
Zinc alloy electric valve worm gear and manufacturing method thereof Download PDFInfo
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- CN102277518A CN102277518A CN2011102492454A CN201110249245A CN102277518A CN 102277518 A CN102277518 A CN 102277518A CN 2011102492454 A CN2011102492454 A CN 2011102492454A CN 201110249245 A CN201110249245 A CN 201110249245A CN 102277518 A CN102277518 A CN 102277518A
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Abstract
The invention relates to a zinc alloy electric valve worm gear and a manufacturing method thereof, belonging to a component of an electric valve and a manufacturing method thereof. The worm gear comprises a worm gear body, tripping teeth located on a shaft sleeve body and an assembly hole in the center of the shaft sleeve body. The worm gear is characterized in that the material of the worm gear body is prepared by increasing the manganese content in ZA-27 zinc alloy to 0.8-1.0% and comprises the following components in percentage by weight: 25-28% of aluminum, 2.8-3.2% of copper, 0.8-1.0% of manganese, 0.01-0.03% of magnesium, less than or equal to 0.1% of iron, less than or equal to 0.01% of nickel, less than or equal to 0.01% of cadmium and the balance of zinc. The manufacturing method is subject to the conventional zinc alloy casting process and is characterized by comprising the following steps of: (1) modifying aluminum alloy to which rare earth metal is added; and (2) cooling the alloy with 100 DEG C boiling water. The aluminum alloy with rare earth metal means industrial Al-RE series casting aluminum alloy with 4.4-5% of rare earth, such as Al-RE-Cu-Si-Mn-Ni-Mg alloy. Trial use and detection results indicate that the tensile strength is greater than or equal to 450 MPa, the hardness is greater than or equal to 140 HB, and the elongation coefficient is greater than or equal to 8%. The zinc alloy electric valve worm gear can fully substitute for the tin bronze alloy electric valve worm gear in the respect of material properties and use effects, and the manufacturing cost is lowered by more than 65%.
Description
Technical field: the invention belongs to the parts and the manufacture method thereof of electrically operated valve, particularly a kind of zinc alloy electrically operated valve worm gear and manufacture method thereof.
Background technology: 2SA series electrically operated valve worm gear has the dropout tooth, not only can be subjected to frequent impact at work its dropout tooth in service, and be subjected to the effect of stress in bending.Except higher intensity, hardness and wear resisting property, also must possess good toughness and plasticity, promptly goodish unit elongation.Existing electrically operated valve worm gear all adopts and satisfies above-mentioned performance requriements, but the expensive tin bronze alloys manufacturing of resource scarcity.This shows that study and design a kind of have tin bronze alloys electrically operated valve worm gear identical good material performance and result of use, the zinc alloy electrically operated valve worm gear and the manufacture method thereof that have reduced use cost again significantly are necessary.
Summary of the invention: the objective of the invention is to overcome the deficiencies in the prior art, research also designs a kind of have tin bronze alloys electrically operated valve worm gear identical good material performance and result of use, has reduced the zinc alloy electrically operated valve worm gear and the manufacture method thereof of use cost again significantly.
The present invention seeks to realize like this: a kind of zinc alloy electrically operated valve worm gear, by worm wheel body, be positioned at the dropout tooth on the sleeve body, the pilot hole that is positioned at the sleeve body center constitutes, the material that it is characterized in that constituting worm wheel body is to improve manganese content to Mn 0.8-1.0% in the ZA-27 zinc alloy, the weight percent of its component is: aluminium Al 25-28%, copper Cu 2.8-3.2%, manganese Mn 0.8-1.0%, magnesium Mg 0.01-0.03%, iron Fe≤0.1%, nickel≤0.01, chromium Cr≤0.01, cadmium Cd≤0.006; Surplus is zinc Zn.
The manufacture method of described a kind of zinc alloy electrically operated valve worm gear, zinc alloy casting technology routinely is characterized in that: the aluminium alloy that A. the adds rare earth metal processing of going bad; B. adopt 100 ℃ of boiling water to cool off.
The aluminium alloy of described rare earth metal is meant that the industrial Al-RE of 4.4%～5% rare earth is a cast aluminium alloy, as the Al-RE-Cu-Si-Mn-Ni-Mg alloy.
Zinc alloy is to be that base adds other elementary composition alloys with zinc.The characteristics of zinc alloy: it is great to compare; Good casting property: fusing point is low, and die cast is not inhaled iron when fusing and die casting easily, does not corrode die mould, not sticking to mould; Good normal temperature mechanical property and wear resistance are arranged, after having added manganese alloy element, can improve its wear resistance at elevated temperature; The more important thing is with tin bronze alloys and compare that manufacturing cost descends more than 60%.
Technical scheme of the present invention is implemented through preliminary, has compared with prior art shown following beneficial effect:
1, the good material performance and the result of use that have tin bronze alloys material electrically operated valve worm gear.Utilize alloying principle to improve the wear resistance of ZA-27 zinc alloy, the manganese of 0.8-1.0% and adopt the aluminium alloy of rare earth metal to go bad to handle after, from tripartite surface strengthening its wear resistance:
A. solution strengthening;
B. form a fairly large number of eutectoid;
C. form the higher manganese of hardness and the complex compound of rare earth and reached dispersion-strengthened effect.
Through practical probation and detection, tensile strength 〉=450MPa; Hardness 〉=140HB; Unit elongation 〉=8%.Its material property and result of use can substitute the tin bronze alloys material electrically operated valve worm gear of prior art fully.
Adopt 100 ℃ of boiling water to cool off special process, prevented on the one hand the growth of flourishing dentrite in the foundry goods effectively, refinement structure organization, improved over-all properties; On the other hand, the foundry goods of having avoided cold water cooling in the past to cause produces slight crack, has improved product percent of pass.
2, reduced use cost significantly.Compare with the tin bronze alloys material electrically operated valve worm gear of prior art, manufacturing cost has reduced more than 65%, and use cost is inevitable to be reduced significantly.
Description of drawings
Fig. 1 is the synoptic diagram that meets thematic structure of the present invention.
Embodiment
Below in conjunction with accompanying drawing implementation detail of the present invention is described as follows:
As shown in Figure 1, a kind of zinc alloy electrically operated valve worm gear, by worm wheel body 1, be positioned at the dropout tooth 2 on the sleeve body, the pilot hole 3 that is positioned at the sleeve body center constitutes, the material that it is characterized in that constituting worm wheel body is to improve manganese content Mn to 0.8-1.0% in the ZA-27 zinc alloy, and the weight percent of its component is:
Aluminium Al 25-28%, copper Cu 2.8-3.2%, manganese Mn 0.8-1.0%, magnesium Mg 0.01-0.03%, iron Fe≤0.1%, nickel≤0.01, chromium Cr≤0.01, cadmium Cd≤0.006; Surplus is zinc Zn.
Material composition and the mechanical property of three embodiment of the present invention see Table 1:
The material composition of table 1 embodiment and mechanical property be wherein: nickel≤0.01, chromium Cr≤0.01, cadmium Cd≤0.006;
The zinc alloy electrically operated valve worm gear manufacture method implementation step of three embodiment of the present invention:
1, batching: by said components and weight percent thereof, the raw material metal of configuration regulatory specifications and accurately weighing;
2, the reinforced melting of order: earlier aluminium ingot is added intermediate frequency furnace, add copper billet again, the heating of unlatching intermediate frequency furnace, treat that aluminium ingot fusing back waits for several minutes, with splash bar visit the end can not feel copper billet have (being that copper billet melts) after, add aluminium manganese master alloy again, treat its fusing back wait several minutes, add at last zinc ingot metal (as need add foundry returns then Ying Yu add before this and confirm that fusing fully), should be interrupted this moment and open intermediate frequency furnace and keep the interior metal of stove to present molten state getting final product, in case temperature is too high.After treating the whole fusions of zinc ingot metal, use splash bar that alloy in the stove is stirred, with temperature-measuring gun beta alloy temperature, alloy temperature is 580～620 ℃ in the control stove, adds MAG block again, is interrupted in 10 minutes and stirs 3～4 times;
Stir after reinforced the finishing, dip alloy, send quality portion to handle and check, enter next step operation after composition is qualified, otherwise in time adjust composition to meeting the requirements with the preceding spectrum sample of particular manufacturing craft casting furnace;
3, the degassing: take the shred air release agent, ladle out with degasification at twice and be pressed into furnace bottom and outgas, till no gas is emerged, control duration and be no more than 10 minutes;
4, the rotten processing: leave standstill the aluminium alloy that adds rare earth metal after 5-8 minute, the industrial Al-RE that is meant 4.4%～5% rare earth is a cast aluminium alloy, as Al-RE-Cu-Si-Mn-Ni-Mg alloy (specifically select for use and see Table in 1), need to adopt bell jar to be pressed into, finish the back at 15--20 minute internal reaction and take out bell jar;
5, casting: take the slag of molten surface in advance with skimming ladle off, be placed in the special-purpose iron pan of table, carefully alloyed metal liquid is stirred with skimming ladle again, get final product tapping casting; With fetching water bag bale-out alloy in pony ladle, remove totally with the oxidation sludge of iron plate the surface, the requirement according to foundry goods cooperatively interacts again, the molten alloy order is poured in the die cavity of mould; Before the cast die cavity is checked comprehensively, guarantee the no sand grains of cleaning in the die cavity, determine pouring procedure according to foundry goods shape, size during cast, constantly raise with the metal bath surface rising, note the molten metal bath flow direction during cast, alloyed metal liquid must be undertaken by same direction (clockwise or counterclockwise) when many people poured into a mould simultaneously.
6, boiling water cooling: behind the casting complete, after the zinc alloy electrically operated valve worm gear in the die cavity of wait mould was cooled to solid-state strand, form removal adopted 100 ℃ of boiling water that strand is cooled off;
7, solution strengthening: A, solution treatment: the strand shove charge is warming up to 520-540 ℃ of insulation, and soaking time 4-6 hour, to come out of the stove into water cooling, medium is a 60-100 ℃ of hot water; B, ageing treatment: the strand shove charge is warming up to 160-190 ℃ of insulation, soaking time 3-10 hour.
8, check warehouse-in: put in storage after the assay was approved by the zinc alloy electrically operated valve worm gear company standard that is higher than the concerned countries standard.
Claims (3)
1. zinc alloy electrically operated valve worm gear, by worm wheel body (1), be positioned at the dropout tooth (2) on the sleeve body, the pilot hole (3) that is positioned at the sleeve body center constitutes, the material that it is characterized in that constituting worm wheel body is to improve manganese content Mn to 0.8-1.0% in the ZA-27 zinc alloy, and the weight percent of its component is:
Aluminium Al 25-28%, copper Cu 2.8-3.2%, manganese Mn 0.8-1.0%, magnesium Mg 0.01-0.03%, iron Fe≤0.1%, nickel≤0.01, chromium Cr≤0.01, cadmium Cd≤0.006; Surplus is zinc Zn.
2. the manufacture method of a kind of zinc alloy electrically operated valve worm gear according to claim 1, zinc alloy casting technology routinely is characterized in that:
A. the aluminium alloy that the adds rare earth metal processing of going bad;
B. adopt 100 ℃ of boiling water to cool off.
3. the manufacture method of a kind of zinc alloy electrically operated valve worm gear according to claim 2 is characterized in that the aluminium alloy of described rare earth metal is meant: the industrial Al-RE of 4.4%～5% rare earth is a cast aluminium alloy, as the Al-RE-Cu-Si-Mn-Ni-Mg alloy.
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| CN2011102492454A CN102277518A (en) | 2011-08-29 | 2011-08-29 | Zinc alloy electric valve worm gear and manufacturing method thereof |
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| CN2011102492454A CN102277518A (en) | 2011-08-29 | 2011-08-29 | Zinc alloy electric valve worm gear and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735046A (en) * | 2015-11-24 | 2017-05-31 | 浙江大明传动科技有限公司 | A kind of extrusion process of zinc alloy worm gear |
| CN115537602A (en) * | 2022-09-29 | 2022-12-30 | 陕西法士特齿轮有限责任公司 | Zinc alloy gear shifting fork block for heavy truck gearbox and casting method thereof |
-
2011
- 2011-08-29 CN CN2011102492454A patent/CN102277518A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735046A (en) * | 2015-11-24 | 2017-05-31 | 浙江大明传动科技有限公司 | A kind of extrusion process of zinc alloy worm gear |
| CN115537602A (en) * | 2022-09-29 | 2022-12-30 | 陕西法士特齿轮有限责任公司 | Zinc alloy gear shifting fork block for heavy truck gearbox and casting method thereof |
| CN115537602B (en) * | 2022-09-29 | 2023-08-08 | 陕西法士特齿轮有限责任公司 | Zinc alloy shift fork block for heavy truck gearbox and casting method thereof |
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Application publication date: 20111214 |