CN103695701A - Crescent block assembly of gear-within-gear pump and preparation method thereof - Google Patents
Crescent block assembly of gear-within-gear pump and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a crescent block assembly of a gear-within-gear pump and a preparation method thereof, and belongs to the technical field of alloy materials. The crescent block assembly is divided into a large crescent block and a small crescent block, wherein the inner cylindrical surface of the large crescent block is in contact with the outer circle surface of a gear shaft of the gear-within-gear pump; the outer cylindrical surface of the small crescent block is in contact with the inner cylindrical surface of the gear shaft of the gear-within-gear pump; a positioning pin is arranged between contact surfaces of the large crescent block and the small crescent block. The large crescent block and the small crescent block are prepared from the following components by weight percent: 60% to 63% of copper, 0.5% to 1.0% of lead, 2.5% to 3.0% of manganese, 0.8% to 1.5% of silicon, less than or equal to 0.3% of nickel, less than or equal to 0.5% of iron and the balance being zinc. The invention further provides the preparation method of the crescent block assembly. The crescent block assembly is high in hardness, precision and toughness, and long in service life. The preparation method is simple, high in labor productivity and material utilization rate and low in production cost.
Description
Technical field
The present invention relates to a kind of crescent moon block assembly for inside gearing pump and preparation method thereof, belong to technical field of alloy material.
Background technology
Toothed gear pump is a kind of hydro-pump extensively adopting in hydraulic efficiency system, can be divided into outside gearing pump and inside gearing pump.And inside gearing pump is usually used in Newtonian liquid or quasi-viscous liquid in the industries such as transfer oil, chemical industry, coating, dyestuff, food, grease, medicine, the kind of conveying liquid can be by lightweight, volatile liquid, until heavy, thickness, even semi-solid state liquid.Inside gearing pump is to adopt the theory of engagement in gear, and inside and outside pitch circle is near on one side, the other side moon block teeth separate.Driving toothed gear on inner gear shaft drives internal wheel rotating in same direction, at ingress's gear, is separated from each other formation negative pressure and sucks liquid, constantly embeds engagement form high pressure by liquid extruding output in exit.And the pump housing, ring gear, month block teeth, gear shaft are the important spare parts in inside gearing pump.Wherein, month block teeth are separated into high pressure chest and low-pressure cavity by gear shaft and the formed work cavity volume of ring gear gear motion, form the radial seal of inside gearing pump, prevent that the oil liquid leakage of high pressure chest is to low-pressure cavity.As everyone knows, the pump housing-ring gear, ring gear-moon block teeth, gear shaft-moon the kinematic pair such as block teeth be that main movement in inside gearing pump is secondary, be also than the kinematic pair that is easier to occur wear out failure.The design of the aspects such as the structure of the pump housing, ring gear, month block teeth, gear shaft and material pairing and process of surface treatment, directly affects the friction and wear characteristic of kinematic pair and the efficiency of inside gearing pump and working life.
Research in recent years draw there is the inside gearing pump of moon block teeth can be by using the rotor of cycloidal tooth profile to realize the object that further raise the efficiency and increase outlet pressure.But the friction of crescent moon block length phase and gear causes very easily friction damage of moon block teeth.
Summary of the invention
The present invention is directed to the above-mentioned problems in the prior art, provide a kind of surface hardness high, dimensional precision is high, the crescent moon block assembly for inside gearing pump of long service life.
Above-mentioned purpose of the present invention is achieved through the following technical solutions: a kind of crescent moon block assembly for inside gearing pump, described crescent moon block assembly is divided into block teeth and solar month of 30 days block teeth in the solar month, described block teeth inner periphery in the solar month contacts with the gear shaft periphery of inside gearing pump, solar month of 30 days block teeth outer cylinder surface and inside gearing pump ring gear inner cylinder face contact, be also provided with steady brace between block teeth and the surface in contact of solar month of 30 days block teeth the solar month.
At the above-mentioned crescent moon block assembly for inside gearing pump, it is characterized in that, described solar month, block teeth and solar month of 30 days block teeth were made by the composition of following weight percent: copper (Cu): 60%-63%, plumbous (Pb): 0.5-1.0%, manganese (Mn): 2.5%-3.0%, silicon (Si): 0.8%-1.5%, nickel (Ni) :≤0.3%, iron (Fe) :≤0.5%, surplus is zinc (Zn).
The present invention is block teeth and each composition and the weight percent of solar month of 30 days block teeth in the solar month by reasonably selecting crescent moon block assembly, make compatibility more reasonable, thereby improve hardness, precision, toughness and other various performances of crescent moon block assembly, and then improve the work-ing life of crescent moon block assembly.
Mn is less than the equivalent coefficient of Zn, only has 0.5, little on the alloy structure impact of crescent moon block assembly.But in Mn solid solution Cu, in manganese brass, add a small amount of Mn can make moon intensity of block teeth alloy be significantly improved.But at the temperature lower than 375 ℃, the solid solubility of excessive Mn in Cu declines, separate out the ζ phase of rich Mn, solid solution strengthening effect is not good, therefore the present invention is controlled at 2.5%-3.0% by the Mn content in crescent moon block assembly, can make crescent moon block assembly there is good over-all properties, especially there is good intensity, hardness.
Fe at α the solubleness in mutually only have 0.1%, the solubleness in (alpha+beta) two phase constitutions also only has 0.2%, when Mn, Ni and Al and Fe coexist, the solubleness of Fe in Cu can increase.Measuring over after its solubleness containing Fe in alloy, when crystallization, first Fe at high temperature separates out as crystallization nuclei, thus crystal grain thinning improves alloy property.Meanwhile, the part Fe of solid solution in Cu plays solution strengthening effect.In addition, Fe can also prevent that in alloy, the ζ of rich Mn separates out mutually.But too high Fe content, can make the amount of Fu Tiexiang too much, and assemble and alligatoring at crystal boundary, the mechanical property of crescent moon block assembly is worsened, corrosion resisting property reduces.Therefore, the present invention is controlled at the Fe content in crescent moon block assembly in 0.5%.
Nickel and copper can form continuous solid solution, significantly expand alpha phase zone, add nickel can significantly improve the solidity to corrosion of alloy in atmosphere, seawater in crescent moon block assembly.Nickel can also be put forward heavy alloyed recrystallization temperature, impels the crystal grain that formation is thinner.
The plumbous actual copper that is insoluble to, is free particle distributions on crystal boundary.Lead is added in alloy and has α and (alpha+beta) two kinds by its tissue.α leaded brass is because plumbous deleterious effect is larger, and high-temp plastic is very low, therefore can only carry out cold deformation or hot extrusion.(alpha+beta) leaded brass at high temperature has good plasticity, can forge.
As preferably, described solar month, block teeth and solar month of 30 days block teeth were made by the composition of following weight percent: copper (Cu): 62%, plumbous (Pb): 0.8%, manganese (Mn): 2.8%, silicon (Si): 1.2%, nickel (Ni): 0.2%, iron (Fe): 0.4%, surplus is zinc (Zn).
As preferably, described solar month, block teeth and solar month of 30 days block teeth were made by the composition of following weight percent: copper (Cu): 63%, plumbous (Pb): 0.5%, manganese (Mn): 3.0%, silicon (Si): 0.8%%, nickel (Ni): 0.2%, iron (Fe): 0.3%, surplus is zinc (Zn).
As preferably, described solar month, block teeth and solar month of 30 days block teeth were made by the composition of following weight percent: copper (Cu): 60%, plumbous (Pb): 1.0%, manganese (Mn): 2.5%%, silicon (Si): 1.5%, nickel (Ni): 0.3%, iron (Fe): 0.35%, surplus is zinc (Zn).
Another object of the present invention is to provide a kind of working method of the above-mentioned crescent moon block assembly for inside gearing pump, and described working method comprises the steps:
S1, by the weight percent of above-mentioned each moiety of month block teeth, take raw material; After composition analysis, drop into process furnace and be smelted into molten metal;
S2, by the molten metal after above-mentioned melting after composition analysis, in temperature, be to be poured in mould at 1000 ℃-1040 ℃, then in die for molding for becoming manganese brass metallic substance;
S3, according to the solar month block teeth and solar month of 30 days block teeth shape and specification by the above-mentioned manganese brass metallic substance in die for molding respectively sawing become block teeth blank and solar month of 30 days block teeth blank in the solar month;
S4, by above-mentioned make the solar month block teeth blank and solar month of 30 days block teeth blank pass through respectively cold extrusion shaped, blanking, rough turn, finish turning, wherein to block teeth honing in solar month inner cylinder face, to solar month of 30 days block teeth cylindrical grinding face, make block teeth and solar month of 30 days block teeth in the solar month, then by steady brace, be assembled into crescent moon block assembly.
The present invention is selecting on the basis of the crescent moon block assembly of reasonable compatibility more, by cold extrusion shaped solar month processed block teeth and solar month of 30 days block teeth.The cold extrusion shaped replacement machining manufacture moon, block teeth had following some benefit: one, cold extrusion shaped is to utilize the viscous deformation of metal to make the block teeth and solar month of 30 days block teeth in the solar month of desired shape, thereby can reduce in a large number machining, improve material use efficiency, the present invention is by cold extrusion shaped, can make the utilization ratio of material reach more than 90%, thereby save material, reduce production costs; Two, can raise labour productivity, make productivity improve several times, tens times, hundreds of times even; Three, can improve the surfaceness of moon block teeth, improve the dimensional precision of month block teeth, make the precision of moon block teeth reach IT7-IT8 level, surfaceness is lower than R0.8; Four, in conjunction with the moiety of crescent moon block assembly of the present invention, the cold hardening of cold extrusion shaped rear metal, and distribute at the rational fibre flow of the inner formation of crescent moon block assembly, make the intensity of crescent moon block assembly far above raw-material intensity, thereby improve the mechanical property of crescent moon block assembly, in addition, cold extruding formation process can make crescent moon block assembly surface form stress and improve fatigue strength, and saves thermal treatment process.
In the working method of the above-mentioned crescent moon block assembly for inside gearing pump, the smelting temperature described in step S1 is 1050-1100 ℃.
In the working method of the above-mentioned crescent moon block assembly for inside gearing pump, during cast described in step S3, temperature is 1000-1020 ℃, and die for molding temperature is 280-320 ℃, and the die sinking time is 180-220s.During cast, should control casting rate, and prevent that slag from entering die cavity.Pouring speed should be steady, to reduce generation oxidation sludge, waters basin mouth and should remain full of state, the oxidation sludge causing to avoid producing turbulent flow.
Wherein, the finish turning described in step S4 needs unit clamp clamping finish turning.
The present invention has the following advantages:
1, the present invention is used for the composition of the crescent moon block assembly of inside gearing pump by reasonable compatibility, has improved hardness, precision, toughness and other various performances of crescent moon block assembly, and then improves the work-ing life of crescent moon block assembly.
2, the present invention adopts cold extrusion shapedly for the preparation method of the crescent moon block assembly of inside gearing pump, and preparation method is simple, can raise labour productivity, and improves material use efficiency, reduces production costs.
3, in the inside gearing pump that the present invention makes, the mechanical property of crescent moon block assembly is good, and dimensional precision is high, smooth surface, and friction conformability is good.
Accompanying drawing explanation
Fig. 1 is the assembly structure schematic diagram for the crescent moon block assembly of inside gearing pump.
Fig. 2 is the assembly structure schematic diagram of inside gearing pump.
In figure: 1, solar month of 30 days block teeth; 2, the solar month block teeth; 3, steady brace; 4, the pump housing; 5, ring gear; 6, gear shaft.
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 embodiment.
Please refer to Fig. 1, Fig. 1 is the assembly structure schematic diagram for the crescent moon block assembly of inside gearing pump.In Fig. 1, crescent moon block assembly is divided into block teeth and solar month of 30 days block teeth in the solar month, wherein, the solar month, block teeth inner periphery contacted with the gear shaft periphery of inside gearing pump, the solar month block teeth outer cylinder surface and solar month of 30 days piece inner periphery close contact, solar month of 30 days block teeth outer cylinder surface and inside gearing pump ring gear inner cylinder face contact.Also be provided with steady brace between block teeth and the surface in contact of solar month of 30 days block teeth the solar month.
Please refer to Fig. 2, the assembly structure schematic diagram that Fig. 2 is inside gearing pump.In Fig. 2, inside gearing pump comprise the pump housing, the ring gear rotatably contacting with pump housing internal surface, and ring gear be connected with a joggle and there is the gear shaft of conjugate tooth profile and be arranged at ring gear and gear shaft between the moon block teeth of arc shape.Gear shaft rotatably contacts with a month block teeth inside arc shape surface, and ring gear rotatably contacts with a month block teeth outer arcuate surface.
When gear shaft rotates, gear shaft drives ring gear to rotate along equidirectional, setting due to arc moon block teeth, in gear shaft and ring gear rotation process, the between cog volume of gear shaft and ring gear one side expands gradually, form vacuum, liquid enters between gear shaft and ring gear under normal atmosphere effect.Meanwhile, the interdental spaces volume of gear shaft and ring gear opposite side reduces the liquid between gear shaft and ring gear to push away gradually.Along with the continuous rotation of gear shaft, liquid is constantly inhaled between gear shaft and ring gear, is also constantly discharged simultaneously.
The present invention for the working method of the crescent moon block assembly of inside gearing pump by described in following embodiment:
Embodiment 1
The weight percent of month each moiety of block teeth takes raw material as described below; After composition analysis, drop into process furnace and be smelted into molten metal under the condition of 1080 ℃.Wherein, block teeth were become to be grouped into by following weight percent with solar month of 30 days block teeth described crescent moon block assembly: copper (Cu): 62% the described solar month, plumbous (Pb): 0.8%, manganese (Mn): 2.8%, silicon (Si): 1.2%, nickel (Ni): 0.2%, iron (Fe): 0.4%, surplus is zinc (Zn).
By the molten metal after above-mentioned melting, after composition analysis, in temperature, be to be poured in mould at 1030 ℃, then in die for molding for becoming manganese brass metallic substance.Die for molding temperature is 300 ℃, and the die sinking time is 200s.
According to the solar month block teeth and solar month of 30 days block teeth shape and specification by the above-mentioned manganese brass metallic substance in die for molding respectively sawing become block teeth blank and solar month of 30 days block teeth blank in the solar month.
By above-mentioned make the solar month block teeth blank and solar month of 30 days block teeth blank pass through respectively cold extrusion shaped, blanking, rough turn, finish turning, wherein to block teeth honing in solar month inner cylinder face, to solar month of 30 days block teeth cylindrical grinding face, make block teeth and solar month of 30 days block teeth in the solar month, then by steady brace, be assembled into crescent moon block assembly.
The weight percent of month each moiety of block teeth takes raw material as described below; After composition analysis, drop into process furnace and be smelted into molten metal under the condition of 1070 ℃.Wherein, block teeth were become to be grouped into by following weight percent with solar month of 30 days block teeth described crescent moon block assembly: copper (Cu): 63% the described solar month, plumbous (Pb): 0.5%, manganese (Mn): 3.0%, silicon (Si): 0.8%%, nickel (Ni): 0.2%, iron (Fe): 0.3%, surplus is zinc (Zn).
By the molten metal after above-mentioned melting, after composition analysis, in temperature, be to be poured in mould at 1020 ℃, then in die for molding for becoming manganese brass metallic substance.Die for molding temperature is 310 ℃, and the die sinking time is 210s.
According to the solar month block teeth and solar month of 30 days block teeth shape and specification by the above-mentioned manganese brass metallic substance in die for molding respectively sawing become block teeth blank and solar month of 30 days block teeth blank in the solar month.
By above-mentioned make the solar month block teeth blank and solar month of 30 days block teeth blank pass through respectively cold extrusion shaped, blanking, rough turn, finish turning, wherein to block teeth honing in solar month inner cylinder face, to solar month of 30 days block teeth cylindrical grinding face, make block teeth and solar month of 30 days block teeth in the solar month, then by steady brace, be assembled into crescent moon block assembly.
The weight percent of month each moiety of block teeth takes raw material as described below; After composition analysis, drop into process furnace and be smelted into molten metal under the condition of 1050 ℃.Wherein, block teeth were become to be grouped into by following weight percent with solar month of 30 days block teeth described crescent moon block assembly: copper (Cu): 60% the described solar month, plumbous (Pb): 1.0%, manganese (Mn): 2.5%%, silicon (Si): 1.5%, nickel (Ni): 0.3%, iron (Fe): 0.35%, surplus is zinc (Zn).
By the molten metal after above-mentioned melting, after composition analysis, in temperature, be to be poured in mould at 1000 ℃, then in die for molding for becoming manganese brass metallic substance.Die for molding temperature is 280 ℃, and the die sinking time is 180s.
According to the solar month block teeth and solar month of 30 days block teeth shape and specification by the above-mentioned manganese brass metallic substance in die for molding respectively sawing become block teeth blank and solar month of 30 days block teeth blank in the solar month.
By above-mentioned make the solar month block teeth blank and solar month of 30 days block teeth blank pass through respectively cold extrusion shaped, blanking, rough turn, finish turning, wherein to block teeth honing in solar month inner cylinder face, to solar month of 30 days block teeth cylindrical grinding face, make block teeth and solar month of 30 days block teeth in the solar month, then by steady brace, be assembled into crescent moon block assembly.
The weight percent of month each moiety of block teeth takes raw material as described below; After composition analysis, drop into process furnace and be smelted into molten metal under the condition of 1100 ℃.Wherein, block teeth were become to be grouped into by following weight percent with solar month of 30 days block teeth described crescent moon block assembly: copper (Cu): 61% the described solar month, plumbous (Pb): 0.6%, manganese (Mn): 2.8%, silicon (Si): 1.0%, nickel (Ni): 0.2%, iron (Fe): 0.45%, surplus is zinc (Zn).
By the molten metal after above-mentioned melting, after composition analysis, in temperature, be to be poured in mould at 1040 ℃, then in die for molding for becoming manganese brass metallic substance.Die for molding temperature is 320 ℃, and the die sinking time is 220s.
According to the solar month block teeth and solar month of 30 days block teeth shape and specification by the above-mentioned manganese brass metallic substance in die for molding respectively sawing become block teeth blank and solar month of 30 days block teeth blank in the solar month.
By above-mentioned make the solar month block teeth blank and solar month of 30 days block teeth blank pass through respectively cold extrusion shaped, blanking, rough turn, finish turning, wherein to block teeth honing in solar month inner cylinder face, to solar month of 30 days block teeth cylindrical grinding face, make block teeth and solar month of 30 days block teeth in the solar month, then by steady brace, be assembled into crescent moon block assembly.
Comparative example
By the technology that prior art is common, brass is processed into crescent moon block assembly.
Randomly draw crescent moon block assembly and the pairing of 45# steel in the embodiment of the present invention, the crescent moon block assembly oil/dry friction coefficient under 100N load that obtains after tested inside gearing pump of the present invention is 0.06/0.16, and after 30 minutes, oil/dry wear amount is 320/1000 μ m.
Crescent moon block assembly in embodiment 1-4 and comparative example is carried out to Performance Ratio, and comparative result is as shown in table 1.
Table 1: the Performance Ratio of the crescent moon block assembly in embodiment 1-4 and comparative example
Be fitted in inside gearing pump the crescent moon block assembly in embodiment 1-4 and comparative example is packaged, inside gearing pump is carried out to performance ratio, result is as shown in table 2.
Table 2: the Performance Ratio of the inside gearing pump of crescent moon block assembly assembling in embodiment 1-4 and comparative example
From table 1-2, the present invention is simple for the preparation method of the crescent moon block assembly of inside gearing pump, and labour productivity is high, material use efficiency is high, production cost is low, and the crescent moon block assembly hardness making is high, and dimensional precision is high, smooth surface, friction conformability is good, surfaceness can be can be controlled in to 0.6-0.8, and squareness tolerance is controlled at 0.003-0.005, form tolerance control, at 0.03-0.05, extends the work-ing life of crescent moon block assembly.
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 (8)
1. the crescent moon block assembly for inside gearing pump, it is characterized in that, described crescent moon block assembly is divided into block teeth and solar month of 30 days block teeth in the solar month, described block teeth inner periphery in the solar month contacts with the gear shaft periphery of inside gearing pump, solar month of 30 days block teeth outer cylinder surface and inside gearing pump ring gear inner cylinder face contact, be also provided with steady brace between block teeth and the surface in contact of solar month of 30 days block teeth the solar month.
2. the crescent moon block assembly for inside gearing pump according to claim 1, it is characterized in that, described solar month, block teeth and solar month of 30 days block teeth were made by the composition of following weight percent: copper (Cu): 60%-63%, plumbous (Pb): 0.5-1.0%, manganese (Mn): 2.5%-3.0%, silicon (Si): 0.8%-1.5%, nickel (Ni) :≤0.3%, iron (Fe) :≤0.5%, surplus is zinc (Zn).
3. the crescent moon block assembly for inside gearing pump according to claim 2, it is characterized in that, described solar month, block teeth and solar month of 30 days block teeth were made by the composition of following weight percent: copper (Cu): 62%, plumbous (Pb): 0.8%, manganese (Mn): 2.8%, silicon (Si): 1.2%, nickel (Ni): 0.2%, iron (Fe): 0.4%, surplus is zinc (Zn).
4. the crescent moon block assembly for inside gearing pump according to claim 2, it is characterized in that, described solar month, block teeth and solar month of 30 days block teeth were made by the composition of following weight percent: copper (Cu): 63%, plumbous (Pb): 0.5%, manganese (Mn): 3.0%, silicon (Si): 0.8%%, nickel (Ni): 0.2%, iron (Fe): 0.3%, surplus is zinc (Zn).
5. the crescent moon block assembly for inside gearing pump according to claim 2, it is characterized in that, described solar month, block teeth and solar month of 30 days block teeth were made by the composition of following weight percent: copper (Cu): 60%, plumbous (Pb): 1.0%, manganese (Mn): 2.5%%, silicon (Si): 1.5%, nickel (Ni): 0.3%, iron (Fe): 0.35%, surplus is zinc (Zn).
6. for a working method for the crescent moon block assembly of inside gearing pump, it is characterized in that, the method comprises the steps:
S1, by the weight percent of each moiety of month block teeth described in claim 2, take raw material; After composition analysis, drop into process furnace and be smelted into molten metal;
S2, by the molten metal after above-mentioned melting after composition analysis, in temperature, be to be poured in mould at 1000 ℃-1040 ℃, then in die for molding for becoming manganese brass metallic substance;
S3, according to the solar month block teeth and solar month of 30 days block teeth shape and specification by the above-mentioned manganese brass metallic substance in die for molding respectively sawing become block teeth blank and solar month of 30 days block teeth blank in the solar month;
S4, by above-mentioned make the solar month block teeth blank and solar month of 30 days block teeth blank pass through respectively cold extrusion shaped, blanking, rough turn, finish turning, wherein to block teeth honing in solar month inner cylinder face, to solar month of 30 days block teeth cylindrical grinding face, make block teeth and solar month of 30 days block teeth in the solar month, then by steady brace, be assembled into crescent moon block assembly.
7. the working method of the crescent moon block assembly for inside gearing pump according to claim 6, is characterized in that, the smelting temperature described in step S1 is 1050-1100 ℃.
8. the working method of the crescent moon block assembly for inside gearing pump according to claim 6, is characterized in that, during cast described in step S3, temperature is 1000-1020 ℃, and die for molding temperature is 280-320 ℃, and the die sinking time is 180-220s.
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| CN103695701B (en) | 2016-04-13 |
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