CN105420456A - Manufacturing method for pump shaft - Google Patents
Manufacturing method for pump shaft Download PDFInfo
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- CN105420456A CN105420456A CN201510759614.2A CN201510759614A CN105420456A CN 105420456 A CN105420456 A CN 105420456A CN 201510759614 A CN201510759614 A CN 201510759614A CN 105420456 A CN105420456 A CN 105420456A
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- pump shaft
- silicon carbide
- dimensional network
- preparation
- treatment
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
Abstract
The invention relates to a manufacturing method for a pump shaft and belongs to the technical field of alloy materials. The manufacturing method includes the following steps that a three-dimensional network silicon carbide/alloy steel composite is firstly subjected to normalizing treatment and then machined into a pump shaft blank, and finally the pump shaft blank is subjected to heat treatment so as to obtain the pump shaft. The volume of silicon carbide in the three-dimensional network silicon carbide/alloy steel composite accounts for 10%-30% of the total volume of the composite. Isothermal normalizing treatment is adopted, the temperature of the isothermal normalizing treatment is 920-940 DEG C, and heat preservation is conducted for 220-260 min. After being subjected to carburizing treatment, the three-dimensional network silicon carbide/alloy steel composite of the pump shaft has a hard abrasion-resisting surface and a tough core part and has high low temperature impact toughness and good machinability; the core part of the pump shaft still keeps toughness and plasticity, and therefore the mechanical properties of the manufactured pump shaft are good; the Rockwell hardness (HRC) of the pump shaft reaches 58-63, the layer depth reaches 0.7-1.0, and the service life is greatly prolonged.
Description
Technical field
The present invention relates to a kind of preparation method of pump shaft, belong to technical field of alloy material.
Background technology
The environment of pump valve work is various, badly, very high to the requirement of material, the steel alloy of current pump valve has varied, main with base alloy such as 40Cr, 20CrMnTi, but still have a lot of problem to exist, as wear resistance, hardness, rustless property, corrosion resistance nature, high and low temperature resistance, fragility, toughness etc., the requirement of production can't be met in a lot of occasion, also require further improvement, to enhance productivity, reduce costs, improve security, extend the work-ing life of pump shaft.
Summary of the invention
The present invention seeks to the preparation method in order to provide a kind of pump shaft, obtained pump shaft better mechanical property, wear-resistant, work-ing life is of a specified duration.
Above-mentioned purpose of the present invention realizes by following technical proposal: a kind of pump shaft, described pump shaft is made up of metal-base composites, described metal-base composites is three-dimensional network silicon carbide/alloy steel composite material, described steel alloy is made up of following composition (by percentage to the quality): C:0.15%-0.20%, Si:0.12%-0.15%, Mn:1.2%-1.6%, Cr:0.6-1.0%, Ti:0.03-0.1%, Nb:0.1-0.2%, V:0.002-0.005%, rare earth element: 0.05-0.1%, Ni≤0.03%, Cu≤0.03%, P≤0.03%, S≤0.03%, surplus is Fe and inevitable impurity element.
The present invention adopts three-dimensional network silicon carbide/alloy steel composite material to make pump shaft, SiC and steel alloy support frame each other, gives full play to the advantage of SiC ceramic and steel alloy two class material, effectively improves the high-temperature stability of pump shaft, wearability etc.Meanwhile, the present invention has done very large improvement to the matrix alloy steel in pump shaft.
In the steel that the present invention uses, C content is 0.15%-0.20%, a kind of soft steel, plasticity and toughness better, hardening capacity is higher, there is hard and wear-resisting surface and tough and tensile heart portion after carburizing and quenching, so have the good processibility of higher low-temperature impact toughness, and machining deformation is small, and anti-fatigue performance is fairly good.In pump shaft steel alloy of the present invention, if carbon content is too high, the toughness in the heart portion of steel can be caused to decline, so C content is 0.15%-0.20% by the present invention, thus ensure that there are enough plasticity and toughness in the heart portion of steel.
Because the intensity of soft steel and hardness can be relatively low, the present invention suitably adds the content of Mn, to improve intensity and the hardness of steel.Meanwhile, also simultaneously containing Nb and Ti two kinds of trace elements in steel of the present invention, play synergy with Mn element, common intensity and the hardness improving steel.Because Nb and Ti two kinds of trace elements not only can crystal grain thinning, can also obtain Dispersed precipitate (Nb, Ti) (C, N) precipitate particle of more high-volume fractional, therefore, can play the effect of refined crystalline strengthening and dispersion-strengthened simultaneously.In addition, Mn element with also play synergy with Cr, Ni, V tri-kinds of elements of containing in steel, improve the hardening capacity of steel, thus make steel after carburizing and quenching, improve intensity and the toughness in the heart portion of steel.So comprehensive above 2 factors, invention increases the content of Mn element in steel, are controlled within the scope of 1.2%-1.6% by the content of Mn element.
In addition, because steel of the present invention carries out carburizing treatment in follow-up needs, and the microstructure coarsening of steel after carburizing treatment, mechanical property also can decline thereupon.Therefore, for this problem, the rare earth element of trace is added with in steel of the present invention, because our experiments show that, steel is in long-time heating carburizing heat treatment process, add rare earth element and there is the effect stoping grain growth and improve mechanical property, and effect highly significant, the flexural strength of the cementation zone of steel, fracture toughness property is higher.And, in steel, add rare earth element, the wear resistance of steel can also be improved, reduce abrasion loss.
As preferably, rare earth element is (1.5-2.0) by mass ratio: Sm and Tb of 1 forms.Add the rare earth element of said ratio scope, steel performance after carburizing treatment is best, and compared with other addition manner, tensile strength, yield strength etc. want high by about 8%, and hardness wants high by about 8%, and toughness wants high by about 5%, and wear resistance wants high by about 12%.
In above-mentioned pump shaft, as preferably, in three-dimensional network silicon carbide/alloy steel composite material, silicon carbide accounts for the 10-30% of total composite volume.If three-dimensional carbon SiClx content in alloy steel matrix is less, does not then have and strengthen improvement result preferably, if content is comparatively large, degraded appearance, over-all properties is difficult to effectively improve.
In above-mentioned pump shaft, as preferably, described three-dimensional network silicon carbide/alloy steel composite material obtains by the following method: utilized by SiC organic carrier dip forming and pressureless sintering technology to prepare three-dimensional network SiC ceramic, preoxidation 1-3h at 1120-1180 DEG C again, makes it at the Surface Creation SiO of network ceramic
2film, then utilizes vacuum-air pressure method for casting to make three-dimensional network silicon carbide/alloy steel composite material, and SiC accounts in matrix material last at 1550-1650 DEG C of anneal 2-3h.
SiC is made three-dimensional network SiC ceramic, then introduce in three-dimensional network SiC by steel alloy, obtained three-dimensional network silicon carbide/alloy steel composite material can make SiC and steel alloy support frame each other, gives full play to the advantage of SiC ceramic and steel alloy two class material.
As preferably, the vacuum tightness in vacuum-air pressure method for casting is 0.05-0.08MPa.
As preferably, the density of network SiC ceramic is 2.6-2.8g/cm
3, porosity reaches 45-55%, and mean pore size is 2-4mm, and the diameter of network muscle is 1-3mm.
The invention still further relates to a kind of preparation method of above-mentioned pump shaft, described preparation method comprises the steps: above-mentioned three-dimensional network silicon carbide/alloy steel composite material first to carry out normalizing treatment, then be machined into pump shaft blank, finally pump shaft blank heat-treated obtained pump shaft.
In the preparation method of above-mentioned pump shaft, described normalizing treatment is isothermal normalizing process, and the temperature of described isothermal normalizing process is 920-940 DEG C, insulation 220-260min, with the cooling of 1.5KW exhaust fan after normalizing treatment completes and comes out of the stove.Normalizing treatment is isothermal normalizing process, and because the carbon content in pump shaft matrix alloy steel of the present invention is lower, belong to soft steel, machinability is not good, and normalizing treatment can improve its machinability.So pump shaft of the present invention have passed through normalizing treatment after shaping, the microstructure improving steel eliminates unrelieved stress, improves machinability, for the mechanical workout of carrying out subsequently is ready.And, what steel of the present invention adopted is isothermal normalizing process, inside and outside the heap existed due to cooling in heap when solving common normalizing treatment and the cooling conditions difference that causes of other factors larger, and cause steel local due to cooling rate too fast formation grain shellfish non-equilibrium microstructure, and slow too much proeutectoid ferrite and the too soft phenomenon separated out is crossed due to cooling rate in some positions of steel, thus can uniform formation be obtained, by the Hardness Control of steel within the specific limits, be more conducive to the carrying out of subsequent mechanical processing.
In the preparation method of above-mentioned pump shaft, described thermal treatment comprises carburizing treatment, temper.Because the carbon content of steel of the present invention is lower, belong to soft steel, so the pump shaft blank using steel of the present invention to prepare first carries out carburizing treatment, carbon atom is made to penetrate into the upper layer of pump shaft blank, pump shaft blank is made to have the upper layer of high carbon steel, again through Quench and temper, make pump shaft blank surface layer have high rigidity and wear resistance, and the heart portion of pump shaft blank still remain toughness and the plasticity of soft steel.
As preferably, described carburizing treatment is for be first warming up to 890-910 DEG C, and insulation 70-90min, then be down to 880-900 DEG C, insulation 30-50min, is then down to 820-840 DEG C, and insulation 20-40min, last air cooling is to room temperature.Carburizing treatment in thermal treatment of the present invention, by the quench treatment under three stage differing tempss, is first eliminated cementation zone carbide network and refinement core structure, is then improved diffusion layer organization, improves hardness and the wear resistance of pump shaft further.
As preferably, the temperature of described temper is 150-180 DEG C, and the time of temper is 100-140min.
Compared with prior art, the present invention has the following advantages:
Pump shaft of the present invention adopts three-dimensional network silicon carbide/alloy steel composite material to make, there is the advantage of SiC ceramic and steel alloy two class material simultaneously, and the moiety of matrix alloy steel and mass percent compatibility thereof are rationally, further increase the intensity of pump shaft, hardness, toughness and wear resistance.In addition, three-dimensional network silicon carbide/the alloy steel composite material of pump shaft of the present invention has hard and wear-resisting surface and tough and tensile heart portion after carburizing treatment, there is the processibility that higher low-temperature impact toughness is good, the heart portion of pump shaft still remains toughness and plasticity, therefore, obtained pump shaft better mechanical property, pump shaft hardness HRC reaches 58-63, layer depth 0.7-1.0, substantially prolongs work-ing life.
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.
Table 1: embodiment of the present invention 1-5 prepares the material of pump shaft
Embodiment 1
(density of network SiC ceramic is 2.6-2.8g/cm SiC to be made three-dimensional network SiC ceramic
3, porosity reaches 45-55%, and mean pore size is 2-4mm, and the diameter of network muscle is 1-3mm), then at 1120 DEG C preoxidation 3h, at the Surface Creation SiO of network ceramic
2film, then utilizes vacuum-air pressure method for casting (vacuum tightness is 0.05MPa) that the steel alloy described in silicon carbide and table 1 embodiment 1 is made three-dimensional network silicon carbide/alloy steel composite material, finally 1650 DEG C of anneal.
Three-dimensional network silicon carbide/alloy steel composite material after above-mentioned anneal is first carried out isothermal normalizing process, and (temperature is 920 DEG C, insulation 260min), then be machined into pump shaft blank, finally pump shaft blank heat-treated obtained pump shaft of the present invention.Wherein, thermal treatment comprises carburizing treatment and temper, and carburizing treatment, for be first warming up to 890 DEG C, to be incubated 90min, then to be down to 880 DEG C, and insulation 50min, is then down to 820 DEG C, insulation 40min, and last air cooling is to room temperature; The temperature of temper is 150 DEG C, and the time of temper is 140min.
Embodiment 2
(density of network SiC ceramic is 2.6-2.8g/cm SiC to be made three-dimensional network SiC ceramic
3, porosity reaches 45-55%, and mean pore size is 2-4mm, and the diameter of network muscle is 1-3mm), then at 1140 DEG C preoxidation 2h, at the Surface Creation SiO of network ceramic
2film, then utilizes vacuum-air pressure method for casting (vacuum tightness is 0.06MPa) that the steel alloy described in silicon carbide and table 1 embodiment 2 is made three-dimensional network silicon carbide/alloy steel composite material, finally 1580 DEG C of anneal.
Three-dimensional network silicon carbide/alloy steel composite material after above-mentioned anneal is first carried out isothermal normalizing process, and (temperature is 935 DEG C, insulation 230min), then be machined into pump shaft blank, finally pump shaft blank heat-treated obtained pump shaft of the present invention.Wherein, thermal treatment comprises carburizing treatment and temper, and carburizing treatment, for be first warming up to 895 DEG C, to be incubated 85min, then to be down to 890 DEG C, and insulation 35min, is then down to 825 DEG C, insulation 35min, and last air cooling is to room temperature; The temperature of temper is 155 DEG C, and the time of temper is 110min.
Embodiment 3
(density of network SiC ceramic is 2.6-2.8g/cm SiC to be made three-dimensional network SiC ceramic
3, porosity reaches 45-55%, and mean pore size is 2-4mm, and the diameter of network muscle is 1-3mm), then at 1150 DEG C preoxidation 2h, at the Surface Creation SiO of network ceramic
2film, then utilizes vacuum-air pressure method for casting (vacuum tightness is 0.06MPa) that the steel alloy described in silicon carbide and table 1 embodiment 3 is made three-dimensional network silicon carbide/alloy steel composite material, finally 1600 DEG C of anneal.
Three-dimensional network silicon carbide/alloy steel composite material after above-mentioned anneal is first carried out isothermal normalizing process, and (temperature is 930 DEG C, insulation 240min), then be machined into pump shaft blank, finally pump shaft blank heat-treated obtained pump shaft of the present invention.Wherein, thermal treatment comprises carburizing treatment and temper, and carburizing treatment, for be first warming up to 900 DEG C, to be incubated 80min, then to be down to 890 DEG C, and insulation 40min, is then down to 830 DEG C, insulation 30min, and last air cooling is to room temperature; The temperature of temper is 160 DEG C, and the time of temper is 120min.
Embodiment 4
(density of network SiC ceramic is 2.6-2.8g/cm SiC to be made three-dimensional network SiC ceramic
3, porosity reaches 45-55%, and mean pore size is 2-4mm, and the diameter of network muscle is 1-3mm), then at 1170 DEG C preoxidation 2h, at the Surface Creation SiO of network ceramic
2film, then utilizes vacuum-air pressure method for casting (vacuum tightness is 0.07MPa) that the steel alloy described in silicon carbide and table 1 embodiment 4 is made three-dimensional network silicon carbide/alloy steel composite material, finally 1630 DEG C of anneal.
Three-dimensional network silicon carbide/alloy steel composite material after above-mentioned anneal is first carried out isothermal normalizing process, and (temperature is 925 DEG C, insulation 250min), then be machined into pump shaft blank, finally pump shaft blank heat-treated obtained pump shaft of the present invention.Wherein, thermal treatment comprises carburizing treatment and temper, and carburizing treatment, for be first warming up to 905 DEG C, to be incubated 75min, then to be down to 885 DEG C, and insulation 45min, is then down to 835 DEG C, insulation 25min, and last air cooling is to room temperature; The temperature of temper is 170 DEG C, and the time of temper is 130min.
Embodiment 5
(density of network SiC ceramic is 2.6-2.8g/cm SiC to be made three-dimensional network SiC ceramic
3, porosity reaches 45-55%, and mean pore size is 2-4mm, and the diameter of network muscle is 1-3mm), then at 1180 DEG C preoxidation 1h, at the Surface Creation SiO of network ceramic
2film, then utilizes vacuum-air pressure method for casting (vacuum tightness is 0.08MPa) that the steel alloy described in silicon carbide and table 1 embodiment 5 is made three-dimensional network silicon carbide/alloy steel composite material, finally 1550 DEG C of anneal.
Three-dimensional network silicon carbide/alloy steel composite material after above-mentioned anneal is first carried out isothermal normalizing process, and (temperature is 940 DEG C, insulation 220min), then be machined into pump shaft blank, finally pump shaft blank heat-treated obtained pump shaft of the present invention.Wherein, thermal treatment comprises carburizing treatment and temper, and carburizing treatment, for be first warming up to 910 DEG C, to be incubated 70min, then to be down to 900 DEG C, and insulation 30min, is then down to 840 DEG C, insulation 20min, and last air cooling is to room temperature; The temperature of temper is 180 DEG C, and the time of temper is 100min.
Comparative example 1
The pump shaft of comparative example 1 adopts commercially available 20CrMnTi low-carbon steel material to make by the preparation method of embodiment 3.
Comparative example 2
Comparative example 2 is only with the difference of embodiment 3, and comparative example 2 pump shaft is only be made up of the steel alloy in embodiment 3.
Comparative example 3
Comparative example 3 is only with the difference of embodiment 3, not containing Nb element in the steel alloy of comparative example 3 pump shaft three-dimensional network silicon carbide/alloy steel composite material.
Comparative example 4
Comparative example 4 is only with the difference of embodiment 3, not containing V element in the steel alloy of comparative example 4 pump shaft three-dimensional network silicon carbide/alloy steel composite material.
Comparative example 5
Comparative example 5 is only with the difference of embodiment 3, the common normalizing treatment technique that in comparative example 5, normalizing treatment adopts.
Comparative example 6
Comparative example 6 is only with the difference of embodiment 3, and the carburizing treatment in comparative example 6 is common carburizing treatment, does not adopt the quench treatment of different steps.
The pump shaft made by above-described embodiment 1-5 and comparative example 1-6 carries out Mechanics Performance Testing, and test result is as shown in table 2 and table 3.
Table 2: embodiment 1-5 pump shaft the performance test results
Table 3: comparative example 1-6 pump shaft the performance test results
From the test result of table 2 and table 3, pump shaft performance of the present invention is better than the performance adopting common iron or the pump shaft that adopts existing preparation method to be prepared from.
The pump shaft embodiment of the present invention and comparative example prepared carries out wear resistance and erosion resistance test.
Wearability test adopts abrasion tester.Through statistics, under the same conditions, the wear loss of the pump shaft that comparative example prepares is higher than the abrasion of the pump shaft that embodiment prepares all the time.And along with the increase of wear test number of times, the difference of the wear loss of comparative example pump shaft and embodiment pump shaft is in expanding tendency.Wear test of the present invention is increased to 3000 times to pump shaft friction from 100 times, and the wear loss mean range of comparative example and embodiment expands 12.7g to from 1.28g.
Erosion resistance test adopts humid heat test and salt spray corrosion test.Through statistics: under identical humid heat test condition, all there is not corrosion phenomenon in the pump shaft that the embodiment of the present invention prepares, and the pump shaft that comparative example prepares all occurs corrosion phenomenon after 960h after 960h, etching time the earliest appear at 870h.Under identical salt-fog test condition, all there is not corrosion phenomenon in the pump shaft that the embodiment of the present invention prepares, and the pump shaft that comparative example prepares all occurs corrosion phenomenon after 50h after 50h, etching time the earliest appear at 40h.
It can thus be appreciated that, the present invention adopts three-dimensional network silicon carbide/alloy steel composite material to make, the moiety of steel alloy and mass percent compatibility thereof are reasonable, and the pump shaft using preparation method of the present invention to be prepared from also is better than the performance adopting common iron or the pump shaft that adopts existing preparation method to be prepared from wear resistance and erosion resistance.
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.
Although made a detailed description the present invention and quoted some specific embodiments as proof, to those skilled in the art, only otherwise it is obvious for leaving that the spirit and scope of the present invention can make various changes or revise.
Claims (8)
1. the preparation method of a pump shaft, it is characterized in that, described preparation method comprises the steps: three-dimensional network silicon carbide/alloy steel composite material first to carry out normalizing treatment, is then machined into pump shaft blank, finally pump shaft blank is heat-treated obtained pump shaft.
2. the preparation method of pump shaft according to claim 1, is characterized in that, in described three-dimensional network silicon carbide/alloy steel composite material, silicon carbide accounts for the 10-30% of total composite volume.
3. the preparation method of pump shaft according to claim 1 and 2, it is characterized in that, described three-dimensional network silicon carbide/alloy steel composite material obtains by the following method: SiC is made three-dimensional network SiC ceramic, then at 1120-1180 DEG C preoxidation 1-3h, at the Surface Creation SiO of network ceramic
2film, then utilizes vacuum-air pressure method for casting to make three-dimensional network silicon carbide/alloy steel composite material, finally 1550-1650 DEG C of anneal.
4. the preparation method of pump shaft according to claim 1 and 2, it is characterized in that, described steel alloy is made up of following composition (by percentage to the quality): C:0.15%-0.20%, Si:0.12%-0.15%, Mn:1.2%-1.6%, Cr:0.6-1.0%, Ti:0.03-0.1%, Nb:0.1-0.2%, V:0.002-0.005%, rare earth element: 0.05-0.1%, Ni≤0.03%, Cu≤0.03%, P≤0.03%, S≤0.03%, surplus is Fe and inevitable impurity element.
5. the preparation method of pump shaft according to claim 1, is characterized in that, described normalizing treatment is isothermal normalizing process, and the temperature of described isothermal normalizing process is 920-940 DEG C, insulation 220-260min.
6. the preparation method of pump shaft according to claim 1, is characterized in that, described thermal treatment comprises carburizing treatment, temper.
7. the preparation method of pump shaft according to claim 6, is characterized in that, described carburizing treatment is for be first warming up to 890-910 DEG C, insulation 70-90min, then be down to 880-900 DEG C, insulation 30-50min, then be down to 820-840 DEG C, insulation 20-40min, last air cooling is to room temperature.
8. the preparation method of pump shaft according to claim 6, is characterized in that, the temperature of described temper is 150-180 DEG C, and the time of temper is 100-140min.
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| CN201510759614.2A CN105420456A (en) | 2015-11-10 | 2015-11-10 | Manufacturing method for pump shaft |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106011623A (en) * | 2016-06-28 | 2016-10-12 | 安徽富乐泰水泵***有限公司 | Pump shaft material resistant to low temperature and high in strength |
| CN107858595A (en) * | 2017-11-29 | 2018-03-30 | 宁波市鸿博机械制造有限公司 | A kind of hydraulic pump splined spindle |
| CN109332708A (en) * | 2018-09-30 | 2019-02-15 | 宁波瑞丰汽车零部件有限公司 | A kind of automobile steering power cylinder fulcrum bearing |
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