CN103775333A - Three-screw pump machine barrel and ceramic treatment method of inner surface of three-screw pump machine barrel - Google Patents
Three-screw pump machine barrel and ceramic treatment method of inner surface of three-screw pump machine barrel Download PDFInfo
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- CN103775333A CN103775333A CN201410035446.8A CN201410035446A CN103775333A CN 103775333 A CN103775333 A CN 103775333A CN 201410035446 A CN201410035446 A CN 201410035446A CN 103775333 A CN103775333 A CN 103775333A
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- 238000000034 method Methods 0.000 title claims abstract description 53
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- 239000012528 membrane Substances 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 11
- 238000002360 preparation method Methods 0.000 claims description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
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- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 abstract description 6
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- 238000006243 chemical reaction Methods 0.000 abstract description 3
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- 230000035945 sensitivity Effects 0.000 abstract 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
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- 239000003513 alkali Substances 0.000 description 1
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Abstract
The invention relates to a three-screw pump machine barrel and a ceramic treatment method of an inner surface of the three-screw pump machine barrel, and belongs to the technical field of material surface modification. The three-screw pump machine barrel can be used for solving the problems that the existing three-screw pump rubber bushing has high temperature sensitivity, is easy to age and has aeolotropy. The three-screw pump machine barrel is characterized in that a ceramic membrane is plated on the inner wall of the three-screw pump machine barrel, the ceramic membrane is more than 800HV in hardness and more than 50mu m in thickness, and the ceramic membrane has the characteristics of high precision, high abrasion resistance, no sensitivity to temperature change and difficulty in chemical reaction with acid-base media. The ceramic treatment method of the inner surface of the three-screw pump machine barrel comprises the following steps: firstly electrifying the pump machine barrel filled with an alkaline working solution by use of a pulsed power supply, so as to generate a Al2O3 film on the inner wall of the pump machine barrel by virtue of the electrochemical reaction, and scanning the surface of the generated film by use of a laser so as to enable the surface of the film to be flattened. The method is suitable for ceramic treatment of the surface of the pump machine barrel.
Description
Technical field
The invention belongs to material surface modifying technology field.
Background technique
Three screw pump, as one of the most frequently used pump kind, is widely used in the numerous areas such as oil, machinery, metallurgy.Three screw pump in the course of the work, and they and the coordinating of sleeve inner surface intermeshing with thread groove on driven screw rod by driving screw, between the import of pump and outlet, form multi-stage sealed chamber, and by these continuous closed chambers, liquid is transported to outlet from the import of pump, thereby form continuous, steady, an axially movable pressured fluid.In the middle of three screw pump, active screw rod, turns round by prime mover driven, and rotating speed is about 1450～2900r/min.Screw rod lining is the important composition parts of three screw pump, and it is bearing the hotwork that produced by friction in mechanicals efforts to it of hydrodynamic pressure that transmission medium produces, screw rod and working procedure firmly.In addition, the kind difference of the medium transmitting due to screw pump, the lubricity of medium is poor or contain microimpurity sometimes.These factors all can cause lining that distortion to a certain degree occurs, and in the time that lining distortion acquires a certain degree, the wearing and tearing between itself and screw rod will aggravate, and when serious, even there will be " stuck " phenomenon, and these all affect working efficiency and the working life of pump.
What at present, three screw pump lining multiselect was on the market used is oil-resistant rubber material (as nitrile butadiene rubber, styrene butadiene rubber etc.).Although rubber is as being that a kind of elastomeric macromolecular material has metallic material and the not available premium properties of other macromolecular material (as wear resistance and oil resistance etc.), but its hypersensitivity to temperature and self be the characteristic such as the aging and anisotropy of material in terms of mechanics easily, seriously limit the application of rubber material, also become the principal element that causes three screw pump to lose efficacy simultaneously.
Summary of the invention
The present invention is high to temperature susceplibility, easily aging and have anisotropic problem in order to solve existing three screw pump rubber bushing, and a kind of method of three screw pump machine barrel and three screw pump machine barrel internal surface ceramic treatment is now provided.
A kind of three screw pump machine barrel, the inwall of this pump machine barrel is coated with layer of ceramic film, and this layer of ceramic membrane comprises 90% to 95% Al
2o
3, thickness is between 50 μ m to 70 μ m, and hardness is at 800HV.
A method for three screw pump machine barrel internal surface ceramic treatment, the method comprises the following steps:
Step 1: the internal surface of pump machine barrel is carried out to ceramic film preparation, and detailed process is:
Utilize end cap by one end sealing of pending pump machine barrel, and be filled with alkaline working solution in the chamber of pump machine barrel;
Three different carbon-points of volume are all immersed in the alkaline working solution in pump machine barrel chamber, and keep three different carbon-points of volume not contact with the inwall of pump machine barrel;
Utilize direct current pulse power source to apply DC pulse between the different carbon-point of three volumes and the outer wall of pump machine barrel;
Utilize alkaline working solution recycle pump, by loop head pipe and loop exit pipe, the alkaline working solution in pump machine barrel is carried out to circulating cooling simultaneously, guarantee that the temperature of alkaline working solution is not higher than 40 ℃;
The thicknesses of layers producing when the internal surface of pump machine barrel reaches while setting the maximum ga(u)ge that voltage can puncture, performs step two;
Step 2: the pump machine barrel after above-mentioned ceramic film preparation is carried out to transformation hardening processing, and detailed process is: the end cap of the pump machine barrel after the preparation of step 1 ceramic film is disassembled, and be fixed on laser works platform;
The laser head that regulates laser, incides on the inwall of pump machine barrel the laser that laser emits;
Make laser by one end of pump machine barrel to the other end, be screw type path the inwall of pump machine barrel scanned, in the time that the inwall of pump machine barrel has all scanned, obtain pump machine barrel after treatment;
Described laser is that counterclockwise circumferential scanning speed is between 1mm/s to 40mm/s along the direction of circumferential scanning;
The speed that described laser scans is vertically between 0.2mm/s to 10mm/s.
Before above-mentioned steps one, first pump machine barrel is cleaned, concrete grammar comprises the following steps:
Step is one by one: pump machine barrel is immersed in clear water, utilize the inwall 1min to 3min of clear water washery pump machine barrel, then pump machine barrel is dried;
Step 1 two: the pump machine barrel after step is cleaned one by one immerses in acetone or anhydrous alcohol, leaves standstill 3min to 5min, then pump machine barrel is dried, and obtains the pump machine barrel after cleaning.
Described in above-mentioned steps one, the solute of alkaline working solution comprises: KOH and NaSiO
3, wherein the concentration of KOH is 2g/L to 4g/L, NaSiO
3concentration be 10g/L to 15g/L.
The solute of above-mentioned alkaline working solution also comprises BN powder, and the concentration of BN powder is 4g/L to 6g/L.
The size of grain of above-mentioned BN powder is 9 μ m to 11 μ m.
Described in step 1, utilize the one-period process of the DC pulse that direct current pulse power source applies between the different carbon-point of three volumes and the outer wall of pump machine barrel to be:
At moment t0, it is the direct impulse that Tz, amplitude are Vz that direct current pulse power source 3 is exported a width, and in the finish time of this direct impulse, it is the negative-going pulse that Tf, amplitude are Vf that direct current pulse power source 3 is exported a width;
At moment t1, it is the direct impulse that Tz, amplitude are Vz that direct current pulse power source 3 is exported a width, and in the finish time of this direct impulse, it is the negative-going pulse that Tf, amplitude are Vf that direct current pulse power source 3 is exported a width;
The rest may be inferred,
At moment ti, it is the direct impulse that Tz, amplitude are Vz that direct current pulse power source 3 is exported a width, and in the finish time of this direct impulse, it is the negative-going pulse that Tf, amplitude are Vf that direct current pulse power source 3 is exported a width;
Wherein, Tz is between 0.01s to 0.08s, and Tz=Tf, and Vz is between 500V to 700V, and Vf is at-150V between-30V, and pulse frequency is between 20Hz to 150Hz, and one-period is 40min to 90min.
A kind of three screw pump machine barrel of the present invention, the inwall of this pump machine barrel is coated with layer of ceramic film, the hardness of this ceramic membrane is more than 800HV, thicknesses of layers is greater than 50 μ m, this ceramic membrane has the characteristic of highi degree of accuracy, high abrasion degree, and acid-alkali medium generation chemical reaction insensitive and difficult to temperature variation, can substitute original rubber bushing, the adhesion property of this ceramic membrane and pump housing hole wall is good simultaneously, and the two there is no obvious stall limit.The method of a kind of three screw pump machine barrel internal surface ceramic treatment of the present invention, first utilizes pulse power supply to being filled with the pump machine barrel energising of alkaline working solution, makes pump machine tube inner wall generate Al under electrochemical reaction
2o
3film, and then utilize laser to scan the film surface generating, make film surface smooth, and hardness is more than 800HV, has improved more than 8 to 10 times, thicknesses of layers is greater than 50 μ m.
Utilize ceramic film prepared by method of the present invention to repair the old pump housing that has microscopic crack, micropore hole, the active time of extension device to a certain extent.The work efficiency of combination process is high, and reject rate is low.
The method of a kind of three screw pump machine barrel of the present invention and three screw pump machine barrel internal surface ceramic treatment, is applicable to pump barrel surface and carries out ceramic processing.
Accompanying drawing explanation
Fig. 1 is the flow chart of the method for a kind of three screw pump machine barrel internal surface ceramic treatment of the present invention;
Fig. 2 is the method for a kind of three screw pump machine barrel internal surface ceramic treatment described in embodiment one, the structural representation of the treatment device that step 1 adopts;
Fig. 3 is the method for a kind of three screw pump machine barrel internal surface ceramic treatment described in embodiment one, and in step 2, laser is along the path schematic diagram of pump machine barrel circumferential scanning;
Fig. 4 is the method for a kind of three screw pump machine barrel internal surface ceramic treatment described in embodiment one, and in step 2, laser is along the path schematic diagram of pump machine barrel axial scan;
Fig. 5 is the timing chart of direct current pulse power source.
Embodiment
Embodiment one: a kind of three screw pump machine barrel described in present embodiment, the inwall of this pump machine barrel is coated with layer of ceramic film, and this layer of ceramic membrane comprises 90% to 95% Al
2o
3, thickness is between 50 μ m to 70 μ m, and hardness is at 800HV.
Embodiment two: illustrate present embodiment with reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the method for a kind of three screw pump machine barrel internal surface ceramic treatment described in present embodiment, the method comprises the following steps:
Step 1: the internal surface of pump machine barrel 1 is carried out to ceramic film preparation, and detailed process is:
Utilize end cap 7 by one end sealing of pending pump machine barrel 1, and be filled with alkaline working solution in the chamber of pump machine barrel 1;
Three different carbon-points 2 of volume are all immersed in the alkaline working solution in pump machine barrel 1 chamber, and keep three different carbon-points 2 of volume not contact with the inwall of pump machine barrel 1;
Utilize direct current pulse power source 3 to apply DC pulse between the different carbon-point 2 of three volumes and the outer wall of pump machine barrel 1;
Utilize alkaline working solution recycle pump 4, by loop head pipe 5 and loop exit pipe 6, the alkaline working solution in pump machine barrel 1 is carried out to circulating cooling simultaneously, guarantee that the temperature of alkaline working solution is not higher than 40 ℃;
The thicknesses of layers producing when the internal surface of pump machine barrel 1 reaches while setting the maximum ga(u)ge that voltage can puncture, performs step two;
Step 2: the pump machine barrel 1 after above-mentioned ceramic film preparation is carried out to transformation hardening processing, and detailed process is: the end cap 7 of the pump machine barrel 1 after the preparation of step 1 ceramic film is disassembled, and be fixed on laser works platform;
The laser head that regulates laser, incides on the inwall of pump machine barrel 1 laser that laser emits;
Make laser by one end of pump machine barrel 1 to the other end, be screw type path the inwall of pump machine barrel 1 scanned, in the time that the inwall of pump machine barrel 1 has all scanned, obtain pump machine barrel 1 after treatment;
Described laser is that counterclockwise circumferential scanning speed is between 1mm/s to 40mm/s along the direction of circumferential scanning;
The speed that described laser scans is vertically between 0.2mm/s to 10mm/s.
In present embodiment, the different carbon-point 2 of described three volumes all adopts oxidation-resistant coated graphite electrode, the selection of electrode diameter need be determined according to the size of pump housing barrel diameter, because electrode diameter is larger, reactive rate is faster, and surface ceramic is more coarse, and course of reaction is just more difficult to controlled, therefore the diameter of generally, selecting graphite electrode barrel diameter is more corresponding thereto little by approximately 25～40%.
In present embodiment, by the valve metal characteristic of aluminum alloy material, and under alkaline solution environment, pump machine barrel 1 is applied to direct current asymmetric pulses voltage, making pump machine barrel 1 surface original position under the acting in conjunction of chemistry, electrochemical reaction generate one deck main component is Al
2o
3film.In the time that thicknesses of layers reaches certain threshold values, there is at first voltage breakdown in some weak location places on rete, and produce plasma discharge phenomenon, in this process, thicknesses of layers continuous uniform increases, and when thicknesses of layers reaches while setting the maximum ga(u)ge that voltage can puncture, stops applying voltage.In whole plasma discharge process, Al
2o
3crystalline phase is progressively changed to high hardness crystalline phase by low hardness crystalline phase, and the surface of oxidation film layer presents porous structure, and aperture size is several microns of left and right.
Then act directly on by laser the thin-film material surface that pump machine barrel 1 inwall generates, laser, to heat effect that material surface produces and power effect, undergoes phase transition the composition on thin layer surface, and then reaches the smooth and cure process of effects on surface.By the surface of laser transformation hardening processing, not only material hardness has obvious lifting, and also improve significantly the fatigue life of part.
Embodiment three: present embodiment is that the method for a kind of three screw pump machine barrel internal surface ceramic treatment described in embodiment two is described further, in present embodiment, before step 1, first pump machine barrel 1 is cleaned, concrete grammar comprises the following steps:
Step is one by one: pump machine barrel 1 is immersed in clear water, utilize the inwall 1min to 3min of clear water washery pump machine barrel 1, then pump machine barrel 1 is dried;
Step 1 two: the pump machine barrel 1 after step is cleaned one by one immerses in acetone or anhydrous alcohol, leaves standstill 3min to 5min, then pump machine barrel 1 is dried, and obtains the pump machine barrel 1 after cleaning.
Embodiment four: present embodiment is that the method for a kind of three screw pump machine barrel internal surface ceramic treatment described in embodiment two is described further, in present embodiment, the solute of alkaline working solution comprises described in step 1: KOH and NaSiO
3, wherein the concentration of KOH is 2g/L to 4g/L, NaSiO
3concentration be 10g/L to 15g/L.
Embodiment five: present embodiment is that the method for a kind of three screw pump machine barrel internal surface ceramic treatment described in embodiment four is described further, in present embodiment, the solute of described alkaline working solution also comprises BN powder, and the concentration of BN powder is 4g/L to 6g/L.
The preferred 5g/L of the concentration of BN powder in present embodiment.
Embodiment six: present embodiment is that the method for a kind of three screw pump machine barrel internal surface ceramic treatment described in embodiment five is described further, in present embodiment, the size of grain of described BN powder is 9 μ m to 11 μ m.
The particle of the powder of BN described in present embodiment is 10 μ m preferably.
Embodiment seven: illustrate present embodiment with reference to Fig. 5, present embodiment is that the method for a kind of three screw pump machine barrel internal surface ceramic treatment described in embodiment two is described further, in present embodiment, utilize described in step 1 the one-period process of the DC pulse that direct current pulse power source 3 applies between the different carbon-point 2 of three volumes and the outer wall of pump machine barrel 1 to be:
At moment t0, it is the direct impulse that Tz, amplitude are Vz that direct current pulse power source 3 is exported a width, and in the finish time of this direct impulse, it is the negative-going pulse that Tf, amplitude are Vf that direct current pulse power source 3 is exported a width;
At moment t1, it is the direct impulse that Tz, amplitude are Vz that direct current pulse power source 3 is exported a width, and in the finish time of this direct impulse, it is the negative-going pulse that Tf, amplitude are Vf that direct current pulse power source 3 is exported a width;
The rest may be inferred,
At moment ti, it is the direct impulse that Tz, amplitude are Vz that direct current pulse power source 3 is exported a width, and in the finish time of this direct impulse, it is the negative-going pulse that Tf, amplitude are Vf that direct current pulse power source 3 is exported a width;
Wherein, Tz is between 0.01s to 0.08s, and Tz=Tf, and Vz is between 500V to 700V, and Vf is at-150V between-30V, and pulse frequency is between 20Hz to 150Hz, and one-period is 40min to 90min.
Embodiment eight: present embodiment is that the method for a kind of three screw pump machine barrel internal surface ceramic treatment described in embodiment two is described further, and in present embodiment, the material of described pump machine barrel 1 is high silicon cast aluminium alloy.
Embodiment nine: present embodiment is that the method for a kind of three screw pump machine barrel internal surface ceramic treatment described in embodiment two is described further, and in present embodiment, laser described in step 2 is CO
2laser or semiconductor laser.
Embodiment ten: present embodiment is that the method for a kind of three screw pump machine barrel internal surface ceramic treatment described in embodiment two is described further, and in present embodiment, the power of described laser is between 10W to 500W.
Embodiment 11: present embodiment is that the method for a kind of three screw pump machine barrel internal surface ceramic treatment described in embodiment two is described further, and in present embodiment, the radiation energy of laser is between 1J to 15J.
Embodiment 12: present embodiment is that the method for a kind of three screw pump machine barrel internal surface ceramic treatment described in embodiment two is described further, in present embodiment, the spot size that laser forms is at 1mm
2to 5mm
2between.
Adopt following test to verify effect of the present invention:
Test one:
The cavity of pump machine barrel is cleaned with clear water, after having cleaned by the cleaning solution in cavity everywhere and be dried and process the moisture that makes to remain in cavity and fully evaporate.Until after cavity bone dry, be filled with acetone or anhydrous alcohol to it, and clean cavity 3min; In cleaning glass container, configure alkaline working solution, wherein KOH concentration is 2g/L, Na
2siO
3concentration is 10g/L, and deionized water volume is 1L, and the temperature of alkaline working solution is between 18 ℃～22 ℃.
Pump machine barrel connects pulse power supply positive pole, and carbon-point connects power cathode, and power supply frequency is 150Hz, and dutycycle is 40%, forward voltage values 420V, and negative voltage value is-60V that preparation time is 60min.After off-test, deenergization, use deionized water long film rear chamber is rinsed, subsequently the pump housing is placed in be dried in be dried processing.After the dry processing of 30min, obtain metallic oxide rete.
Setting CO2 laser device laser head is 13mm/s along the sweep rate in axially bored line Vertical direction, is 1mm/s along the speed in axially bored line direction, and the overlapping coefficient of adjacent light path is 20%, and power is 130W, and radiation energy is 3J, and spot size is 2mm
2.
After testing, prepared Al
2o
3thicknesses of layers 0.2 μ m, the hardness of rete is 900HV, and film surface is even, non-microcracked or micropore hole exists.Show excellent wear-resisting property and fatigue behaviour.
Test two:
The cavity of pump machine barrel is cleaned with clear water, after having cleaned by the cleaning solution in cavity everywhere and be dried and process the moisture that makes to remain in cavity and fully evaporate.Until after cavity bone dry, be filled with acetone or anhydrous alcohol to it, and clean cavity 3min; In cleaning glass container, configure alkaline working solution, wherein KOH concentration is 2g/L, Na
2siO
3concentration is 10g/L, and deionized water volume is 1L, and the temperature of alkaline working solution is between 18 ℃～22 ℃.
Pump machine barrel connects pulse power supply positive pole, and carbon-point connects power cathode, and power supply frequency is 150Hz, and dutycycle is 40%, forward voltage values 420V, and negative voltage value is-60V that preparation time is 60min.After off-test, deenergization, use deionized water long film rear chamber is rinsed, subsequently the pump housing is placed in be dried in be dried processing.Through 30min is dry process after, obtain thering is metallic oxide rete described in specific embodiment of the invention step 1.
Setting CO2 laser device laser head is 20mm/s along the sweep rate in axially bored line Vertical direction, is 1mm/s along the speed in axially bored line direction, and the overlapping coefficient of adjacent light path is 10%, and power is 100W, and radiation energy is 2J, and spot size is 5mm
2.
Claims (10)
1. a three screw pump machine barrel, is characterized in that, the inwall of this pump machine barrel is coated with layer of ceramic film, and this layer of ceramic membrane comprises 90% to 95% Al
2o
3, thickness is between 50 μ m to 70 μ m, and hardness is at 800HV.
2. a method for three screw pump machine barrel internal surface ceramic treatment, is characterized in that, the method comprises the following steps:
Step 1: the internal surface to pump machine barrel (1) carries out ceramic film preparation, and detailed process is:
Utilize end cap (7) by one end sealing of pending pump machine barrel (1), and be filled with alkaline working solution in the chamber of pump machine barrel (1);
Three different carbon-points (2) of volume are all immersed in the alkaline working solution in pump machine barrel (1) chamber, and keep three different carbon-points (2) of volume not contact with the inwall of pump machine barrel (1);
Utilize direct current pulse power source (3) to apply DC pulse between the different carbon-point (2) of three volumes and the outer wall of pump machine barrel (1);
Utilize alkaline working solution recycle pump (4), by loop head pipe (5) and loop exit pipe (6), the alkaline working solution in pump machine barrel (1) is carried out to circulating cooling simultaneously, guarantee that the temperature of alkaline working solution is not higher than 40 ℃;
The thicknesses of layers producing when the internal surface of pump machine barrel (1) reaches while setting the maximum ga(u)ge that voltage can puncture, performs step two;
Step 2: the pump machine barrel (1) after above-mentioned ceramic film preparation is carried out to transformation hardening processing, and detailed process is: the end cap (7) of the pump machine barrel (1) after the preparation of step 1 ceramic film is disassembled, and be fixed on laser works platform;
The laser head that regulates laser, incides on the inwall of pump machine barrel (1) laser that laser emits;
Make laser by one end of pump machine barrel (1) to the other end, be screw type path the inwall of pump machine barrel (1) scanned, in the time that the inwall of pump machine barrel (1) has all scanned, obtain pump machine barrel after treatment (1);
Described laser is that counterclockwise circumferential scanning speed is between 1mm/s to 40mm/s along the direction of circumferential scanning;
The speed that described laser scans is vertically between 0.2mm/s to 10mm/s.
3. the method for a kind of three screw pump machine barrel internal surface ceramic treatment according to claim 2, is characterized in that, before step 1, first pump machine barrel (1) is cleaned, and concrete grammar comprises the following steps:
Step is one by one: pump machine barrel (1) is immersed in clear water, utilize the inwall 1min to 3min of clear water washery pump machine barrel (1), then pump machine barrel (1) is dried;
Step 1 two: the pump machine barrel (1) after step is cleaned one by one immerses in acetone or anhydrous alcohol, leaves standstill 3min to 5min, then pump machine barrel (1) is dried, and obtains the pump machine barrel (1) after cleaning.
4. the method for a kind of three screw pump machine barrel internal surface ceramic treatment according to claim 2, is characterized in that, the solute of alkaline working solution comprises described in step 1: KOH and NaSiO
3, wherein the concentration of KOH is 2g/L to 4g/L, NaSiO
3concentration be 10g/L to 15g/L.
5. the method for a kind of three screw pump machine barrel internal surface ceramic treatment according to claim 4, is characterized in that, the solute of described alkaline working solution also comprises BN powder, and the concentration of BN powder is 4g/L to 6g/L.
6. the method for a kind of three screw pump machine barrel internal surface ceramic treatment according to claim 5, is characterized in that, the size of grain of described BN powder is 9 μ m to 11 μ m.
7. the method for a kind of three screw pump machine barrel internal surface ceramic treatment according to claim 2, it is characterized in that, utilize described in step 1 the one-period process of the DC pulse that direct current pulse power source (3) applies between the different carbon-point (2) of three volumes and the outer wall of pump machine barrel (1) to be:
At moment t0, a width of direct current pulse power source (3) output is the direct impulse that Tz, amplitude are Vz, and in the finish time of this direct impulse, a width of direct current pulse power source (3) output is the negative-going pulse that Tf, amplitude are Vf;
At moment t1, a width of direct current pulse power source (3) output is the direct impulse that Tz, amplitude are Vz, and in the finish time of this direct impulse, a width of direct current pulse power source (3) output is the negative-going pulse that Tf, amplitude are Vf;
The rest may be inferred,
At moment ti, a width of direct current pulse power source (3) output is the direct impulse that Tz, amplitude are Vz, and in the finish time of this direct impulse, a width of direct current pulse power source (3) output is the negative-going pulse that Tf, amplitude are Vf;
Wherein, Tz is between 0.01s to 0.08s, and Tz=Tf, and Vz is between 500V to 700V, and Vf is at-150V between-30V, and pulse frequency is between 20Hz to 150Hz, and one-period is 40min to 90min.
8. the method for a kind of three screw pump machine barrel internal surface ceramic treatment according to claim 2, is characterized in that, the material of described pump machine barrel (1) is high silicon cast aluminium alloy.
9. the method for a kind of three screw pump machine barrel internal surface ceramic treatment according to claim 2, is characterized in that, laser described in step 2 is CO
2laser or semiconductor laser.
10. the method for a kind of three screw pump machine barrel internal surface ceramic treatment according to claim 2, is characterized in that, the power of described laser is between 10W to 500W, and the radiation energy of laser is between 1J to 15J, and the spot size that laser forms is at 1mm
2to 5mm
2between.
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| CN103775333B (en) | 2017-02-08 |
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