CN103624492B - A kind of processing technique improving float grease seal mechanical performance - Google Patents
A kind of processing technique improving float grease seal mechanical performance Download PDFInfo
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- CN103624492B CN103624492B CN201310609728.XA CN201310609728A CN103624492B CN 103624492 B CN103624492 B CN 103624492B CN 201310609728 A CN201310609728 A CN 201310609728A CN 103624492 B CN103624492 B CN 103624492B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
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Abstract
The invention discloses a kind of processing technique improving float grease seal mechanical performance, described float grease seal has thickness less than the machining thin-walled of 5mm, described processing technique comprises the steps: smelting molten steel, sand casting, Shot Blasting, modifier treatment, inspection of blank, machining, product inspection and packaging warehouse-in, in described smelting molten steel process, the smelting furnace that capacity is 250～300kg adds following components, Cr:65kg, Mo:8.0～8.3kg, Ni:2.3～2.5kg, Mn:2kg, Si:0.9kg, niobium powder: 0.9kg, C:2.1kg, Cu:1.3kg, steel scrap: 120～130kg, the pig iron: 30kg, foundry returns: 10kg, carburant: 5kg；The percentage by weight having smelted in rear smelting furnace each constituent of molten steel for pouring into a mould is: Cr 15～18%, Mo 2.0～4.0%, Ni 1.0～2.0%, Mn 0.5～1.0%, Si 1.1～1.6%, Nb 1.1～1.8%, C 3.2～3.6%, S < 0.1%, P < 0.1%, Cu < 0.5%, and all the other are Fe and inevitable impurity.
Description
Technical field
The present invention relates to a kind of walking machine float grease seal, especially a kind of processing technique improving float grease seal mechanical performance.
Background technology
Float grease seal is the non-contact mechanical seal of a kind of specific form, is the mechanical seal mode of a kind of compact grown up for adapting to severe working environment, and it is strong that it has contamination resistance, wear-resisting, shock-resistant, reliable operation, end wear compensates automatically, advantages of simple structure and simple.Floating current oil sealing is widely used in the fields such as engineering machinery, coal mine machinery, building machinery, petroleum machinery and aviation boats and ships, wherein apply the most general on construction machinery product, all have application including on various conveyers, sand preparing machine, coal mine equipment, concrete equipment etc..
The sealing principle of float grease seal is: two floating sealing rings are subject to the deformation after axially compression by O-ring seals, produce the thrust to floating sealing ring seal face, along with the uniform wear of seal face, this elastic energy stored by O-ring seals progressively discharges, thus playing nose balance effect.Therefore, float grease seal use floating sealing ring end face and the wearability of O-ring seals, thermostability, oil resistivity, sealing requirements high.The float grease seal produced according to existing technical recipe has increased number of stomata, and under the hot environment produced, steel oxidation is serious, the float grease seal fragility made is strong, thin-walled as machined surface is easily broken off, and anti-wear performance is poor, and sealing property is not good, service life is generally lower than 4500 hours, and uses also fragile when high-strength working.
Summary of the invention
Present invention aims to the deficiencies in the prior art, it is provided that a kind of processing technique improving float grease seal mechanical performance and service life, meet mechanical seal industry requirement.
nullIn order to solve above-mentioned technical problem，The present invention is addressed by following technical proposals: a kind of processing technique improving float grease seal mechanical performance，Described float grease seal has thickness less than the machining thin-walled of 5mm，Described processing technique comprises the steps: smelting molten steel、Sand casting、Shot Blasting、Modifier treatment、Inspection of blank、Machining、Product inspection and packaging warehouse-in，In described smelting molten steel process，The smelting furnace that capacity is 250～300kg adds following components，Cr:65kg，Mo:8.0～8.3kg，Ni:2.3～2.5kg，Mn:2kg，Si:0.9kg，Niobium powder: 0.9kg，C:2.1kg，Cu:1.3kg，Steel scrap: 120～130kg，The pig iron: 30kg，Foundry returns: 10kg，Carburant: 5kg；The percentage by weight having smelted in rear smelting furnace each constituent of molten steel for pouring into a mould is: Cr15～18%, Mo2.0～4.0%, Ni1.0～2.0%, Mn0.5～1.0%, Si1.1～1.6%, Nb1.1～1.8%, C3.2～3.6%, S < 0.1%, P < 0.1%, Cu < 0.5%, and all the other are Fe and inevitable impurity.
The lateral surface of the machining thin-walled of described float grease seal is work surface, and described work surface forms through turnery processing, lonneal process, attrition process successively, roughness Ra≤0.1 μm of work surface, the flatness F of sealing surface≤0.1mm.
In the metallographic structure of described work surface, the area of acicular tempered martensite is no less than 65%, and the hardness HRC of work surface is 62～72.
Described product inspection includes size detection, mechanical performance detection, sealing property detection and dynamic life time detection.
The detection of described mechanical performance includes tensile strength detection, hardness determination and shock resistance detection.
Described size detection includes work surface roughness measurement, the detection of work surface flatness and work surface external diameter roundness measurement.
Described inspection of blank includes surface quality defect detection and internal carrying out flaw detection.
In the formula of the present invention, ferrum is basic element, and what chromium played is the effect of the corrosion resistance of a kind of float grease seal improving the present invention.Add molybdenum and improve intensity and the anti-wear performance of float grease seal.Nickel plays the effect promoting austenitic formation.Element silicon, manganese element can improve the quenching degree of float grease seal.What niobium played is the durability improving float grease seal, reduce the effect of creep and crackle, the elevated temperature strength simultaneously making float grease seal increases, and processing characteristics is improved, and mixes niobium simultaneously and can improve the steel non-oxidizability when high temperature in steel, improve the welding performance of steel, additionally niobium also has the function absorbing residual gas, when steel-making, it is possible to absorb the gas making float grease seal produce pore, make the float grease seal produced without eyelet, bubble-free.P elements and element sulphur are all objectionable impurities elements, and the performance of float grease seal of the present invention is harmful by these elements, therefore should lack as far as possible.Carbon can promote austenitic formation, but the addition of carbon, the plasticity of float grease seal will be reduced, be disadvantageous for processing the pump housing of boric acid recirculation pump, therefore its content must strictly control.Add copper and further enhance the intensity of float grease seal.By the formula of the present invention and technique, the float grease seal work surface hardness produced increases, and wearability strengthens, service life extends.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is described in further detail:
Embodiment 1A kind of processing technique improving float grease seal mechanical performance, described float grease seal has thickness less than the machining thin-walled of 5mm, described processing technique comprises the steps: smelting molten steel, sand casting, Shot Blasting, modifier treatment, inspection of blank, machining, product inspection and packaging warehouse-in, in described smelting molten steel process, the smelting furnace that capacity is 300kg adds following components, Cr:65kg, Mo:8.1kg, Ni:2.4kg, Mn:2kg, Si:0.9kg, niobium powder: 0.9kg, C:2.1kg, Cu:1.3kg, steel scrap: 125kg, the pig iron: 30kg, foundry returns: 10kg, carburant: 5kg；The percentage by weight having smelted in rear smelting furnace each constituent of molten steel for pouring into a mould is: Cr16.5%, Mo3.2%, Ni1.3%, Mn0.63%, Si1.5%, Nb1.35%, C3.3%, S0.05%, P0.05%, Cu0.35%, and all the other are Fe and inevitable impurity.Owing to adding niobium powder in furnace formula, greatly reduce float grease seal surface when high temperature oxidized, increase the hardness on float grease seal surface, wearability, impact resistance, thus ensureing the sealing property of float grease seal.
The lateral surface of the machining thin-walled of described float grease seal is work surface, and described work surface forms through turnery processing, lonneal process, attrition process successively, roughness Ra=0.02 μm of work surface, the flatness F=0.002mm of sealing surface.
In the metallographic structure of described work surface, the area of acicular tempered martensite is no less than 65%, and the hardness HRC of work surface is 64.2.
Described product inspection includes size detection, mechanical performance detection, sealing property detection and dynamic life time detection.Wherein the technology requirement of sealing property detection is: be installed on test-bed by sealing ring, inner chamber passes into enough machine oil, set fixed rotating speed as 250r/min, it is allowed to continuously run 10min, in process of the test and after test, should there be seepage seal ring seal position, and actually detected result reaches requirement, and seal ring seal position does not have seepage.The technology of dynamic life time detection requires: be installed on test-bed by sealing ring, adopts rifle of buying oil that machine oil injects sealing ring inner chamber, testing stand rotating speed >=250r/min before test, and in around-the clock operation process, should there be seepage seal ring seal position.After test, should there is not the defect that the impact such as cut, coarse, crackle, defect seals in seal ring seal face, and actually detected result reaches requirement.
The detection of described mechanical performance includes tensile strength detection, hardness determination and shock resistance detection.In described hardness determination, the requirement to float grease seal hardness is 62～72.And actually detected be 64.2, meet the requirements.
Described size detection includes work surface roughness measurement, the detection of work surface flatness and work surface external diameter roundness measurement.In described roughness measurement, the requirement to working surface roughness is less than 0.1 μm, and actually detected result is 0.02, meets the requirements.In the detection of described flatness, the requirement to work surface flatness is less than 0.1mm, and actually detected result is 0.002mm, meets the requirements.In described work surface external diameter roundness measurement, the requirement to work surface external diameter circularity is less than 0.5mm, and testing result is 0.06mm, meets the requirements.
Described inspection of blank includes surface quality defect detection and internal carrying out flaw detection.It is about 20% according to the float grease seal percent defective that prior art produces.And in the present invention, owing to adding niobium powder in furnace formula, greatly reduce float grease seal surface when high temperature oxidized, increase the hardness on float grease seal surface, wearability, impact resistance, prevent slag inclusion gas enclosure in the float grease seal produced, thus ensureing the sealing property of float grease seal simultaneously.Detecting sampling 100 with batch of 1000, percent defective is about 5%.As can be seen here, the formula of the present invention and technique substantially increase the quality of float grease seal.
Embodiment 2A kind of processing technique improving float grease seal mechanical performance, described float grease seal has thickness less than the machining thin-walled of 5mm, described processing technique comprises the steps: smelting molten steel, sand casting, Shot Blasting, modifier treatment, inspection of blank, machining, product inspection and packaging warehouse-in, in described smelting molten steel process, the smelting furnace that capacity is 300kg adds following components, Cr:65kg, Mo:8.3kg, Ni:2.5kg, Mn:2kg, Si:0.9kg, niobium powder: 0.9kg, C:2.1kg, Cu:1.3kg, steel scrap: 125kg, the pig iron: 30kg, foundry returns: 10kg, carburant: 5kg；The percentage by weight having smelted in rear smelting furnace each constituent of molten steel for pouring into a mould is: Cr16%, Mo3.0%, Ni1.2%, Mn0.6%, Si1.3%, Nb1.2%, C3.0%, S0.05%, P0.052%, Cu0.36%, and all the other are Fe and inevitable impurity.As follows according to the float grease seal testing result that embodiment 1 same process prepares:
This embodiment 2 contrasts with embodiment 1, the niobium powder amount being actually added into is constant, other raw material increases cause that niobium powder weight ratio in entirety reduces, above table analysis learn, the hardness of this float grease seal, surface roughness, surface planarity and work surface external diameter circularity are all not so good as the good of embodiment 1.Sampling detection, percent defective is about 7%.
Embodiment 3A kind of processing technique improving float grease seal mechanical performance, described float grease seal has thickness less than the machining thin-walled of 5mm, described processing technique comprises the steps: smelting molten steel, sand casting, Shot Blasting, modifier treatment, inspection of blank, machining, product inspection and packaging warehouse-in, in described smelting molten steel process, the smelting furnace that capacity is 300kg adds following components, Cr:65kg, Mo:8.1kg, Ni:2.4kg, Mn:2kg, Si:0.9kg, niobium powder: 1.5kg, C:2.1kg, Cu:1.3kg, steel scrap: the 125kg pig iron: 3, 0kg, foundry returns: 10kg, carburant: 5kg；The percentage by weight having smelted in rear smelting furnace each constituent of molten steel for pouring into a mould is: Cr16.5%, Mo3.2%, Ni1.3%, Mn0.63%, Si1.5%, Nb1.55%, C3.3%, S0.05%, P0.05%, Cu0.35%, and all the other are Fe and inevitable impurity.As follows according to the float grease seal testing result that embodiment 1 same process prepares:
Embodiment 3 and embodiment 1 contrast, and other component amount are constant, only increase the amount of niobium powder, thus increasing niobium in overall weight ratio, it has been found that the effect that float grease seal records is not so good as embodiment 1.Sampling detection, percent defective is about 9%.Due under high temperature, niobium and the direct chemical combination of carbon, therefore, unsuitable excessive.
Data above obtains by Zhejiang Fangyuan Test Group Co., Ltd.'s detection.By above-mentioned detection data analysis it can be seen that the indices of this float grease seal all meets the requirements.And in actual use, it is all higher than 6500h the service life of the float grease seal obtained by the present invention program, compared to existing technology, service life is greatly improved.
It addition, the process involved by this technical recipe make use of steel scrap and foundry returns, not only environmental protection but also achieve the maximum utilization of resource.
In the present invention, float grease seal chemical composition rational proportion coordinates the final finished of cast at every Testing index all in standard more than 5%～10% in the industry, is worthy of popularization.
In a word, the foregoing is only presently preferred embodiments of the present invention, all equalizations made according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (7)
1. the processing technique improving float grease seal mechanical performance, described float grease seal has thickness less than the machining thin-walled of 5mm, and described processing technique comprises the steps: smelting molten steel, sand casting, Shot Blasting, modifier treatment, inspection of blank, machining, product inspection and packaging warehouse-in；It is characterized in that: in described smelting molten steel process, the smelting furnace that capacity is 300kg adds following components, Cr:65kg, Mo:8.1kg, Ni:2.4kg, Mn:2kg, Si:0.9kg, niobium powder: 0.9kg, C:2.1kg, Cu:1.3kg, steel scrap: 125kg, the pig iron: 30kg, foundry returns: 10kg, carburant: 5kg；The percentage by weight having smelted in rear smelting furnace each constituent of molten steel for pouring into a mould is: Cr16.5%, Mo3.2%, Ni1.3%, Mn0.63%, Si1.5%, Nb1.35%, C3.3%, S0.05%, P0.05%, Cu0.35%, and all the other are Fe and inevitable impurity.
2. processing technique according to claim 1, it is characterized in that, the lateral surface of the machining thin-walled of described float grease seal is work surface, described work surface forms through turnery processing, lonneal process, attrition process successively, roughness Ra≤0.1 μm of work surface, the flatness F of sealing surface≤0.1mm.
3. processing technique according to claim 2, it is characterised in that in the metallographic structure of described work surface, the area of acicular tempered martensite is no less than 65%, the hardness HRC of work surface is 62～72.
4. the processing technique according to claim 1 or 2 or 3, it is characterised in that described product inspection includes size detection, mechanical performance detection, sealing property detection and dynamic life time detection.
5. processing technique according to claim 4, it is characterised in that the detection of described mechanical performance includes tensile strength detection, hardness determination and shock resistance detection.
6. processing technique according to claim 4, it is characterised in that described size detection includes work surface roughness measurement, the detection of work surface flatness and work surface external diameter roundness measurement.
7. processing technique according to claim 1, it is characterised in that described inspection of blank includes surface quality defect detection and internal carrying out flaw detection.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105880951A (en) * | 2016-06-03 | 2016-08-24 | 江苏南山冶金机械制造有限公司 | Processing technology for W-shaped heat accumulation type radiation pipe |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107790640A (en) * | 2017-10-23 | 2018-03-13 | 浙江广力工程机械有限公司 | A kind of processing preparation technology of float grease seal |
| CN115700290A (en) * | 2022-10-28 | 2023-02-07 | 浙江广力工程机械有限公司 | Floating seal ring for floating oil seal and preparation method thereof |
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Application publication date: 20140312 Assignee: Longquan Yide Construction Machinery Co., Ltd Assignor: Zhejiang Guangli Construction Machinery Co., Ltd Contract record no.: X2021330000694 Denomination of invention: A processing technology for improving the mechanical properties of floating oil seal Granted publication date: 20160706 License type: Common License Record date: 20211104 |