CN103447938B - Grinding process of sealing surface of ball valve - Google Patents
Grinding process of sealing surface of ball valve Download PDFInfo
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- CN103447938B CN103447938B CN201310373163.XA CN201310373163A CN103447938B CN 103447938 B CN103447938 B CN 103447938B CN 201310373163 A CN201310373163 A CN 201310373163A CN 103447938 B CN103447938 B CN 103447938B
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Abstract
The invention relates to a grinding process of a sealing surface of a ball valve. The grinding process comprises the steps of rough grinding, fine grinding, ultrafine grinding, and grinding and cleaning of a valve seat and a sphere, wherein a diamond paste and an engine oil mixture are adopted in the rough grinding, the particle size phi of the selected diamond paste ranges from 40mu m to 10mu m, so that the scratch removal and sphere rounding can be realized; in fine grinding, a diamond paste, kerosene and a microcrystal graphite mixture are adopted, the particle size phi of the selected diamond paste ranges from 7mu m to 5mu m, so that the primary mirror surface effect can be achieved; in the ultrafine grinding, a diamond paste and a microcrystal graphite and kerosene mixture are adopted, the particle size phi of the selected diamond paste is smaller than 5mu m, the rotating speed of the sphere is controlled to be below 5rpm to achieve the mirror surface effect, and finally the kerosene is coated on the sphere and grinding cleaning are performed to achieve a better mirror surface effect. The sphere ground and the sealing surface of the valve seat can achieve the mirror surface effect, the surface roughness can achieve Ra0.02-0.005, the operation torque is low, the service life is long, the valve seat can be adsorbed on the spherical surface of the sphere, and no leakage exists under the trial pressure of low-pressure nitrogen being 0.6Mpa.
Description
Technical field
The present invention relates to valve manufacture field, is specifically the manufacturing process of ball valve, more precisely the grinding technics of sealing surface between ball seat and spheroid.
Background technology
In ball valve, between valve seat and spheroid, the processing of sealing surface adopts grinding technics, the fineness of sealing surface between its valve seat and spheroid, and the goodness of fit between valve seat and spheroid, directly affect the sealing property between ball seat and spheroid, valve opening and closing operation moment of torsion and valve service life etc.Between the valve seat that existing grinding technics obtains and spheroid, the roughness of sealing surface is Ra0.15-0.2, and the goodness of fit between valve seat and spheroid detects: low-pressure nitrogen pressure testing 0.6Mpa has micro-leakage, spheroid can be observed directly by naked eyes and sealing surface of seat is black simultaneously.Between its valve seat and spheroid, sealing surface fineness is poor, makes the coefficient of friction of sealing surface between valve seat and spheroid large (being about 0.2+); Thus it is large to cause valve opening and closing to operate moment of torsion, operation inconvenience, between valve seat and spheroid, sealing is poor, and sealing surface easily weares and teares, the defect that service life is short.
Summary of the invention
For the defect of sealing surface fineness and goodness of fit difference between the valve seat existed in prior art and spheroid, the object of the present invention is to provide a kind of ball valve sealing face grinding technics, realize the mirror effect that sealing surface of seat and spheroid present sub-light (turning white or burnt hair) or more best bright finish, and the good goodness of fit between valve seat and spheroid, greatly reduce the coefficient of friction between valve seat and spheroid, there is the advantage that ball valve sealing performance is good, open and close the light and long service life of operation.
For achieving the above object, the invention provides following technical scheme: a kind of ball valve sealing face grinding technics, is placed in spheroid on the spin finishing platform of lapping device, it is characterized in that: carry out according to following grinding steps:
(1) rough lapping: control spheroid rotating speed at 10rpm ~ 150rpm, the grinding tool on lapping device is first adopted to grind spheroid, be ground to and remove grinding machine cut on spheroid and rounding spheroid, use valve seat and spheroid instead to be mutually ground to and to remove grinding machine cut on sealing surface of seat, abradant abrasive material is the mixture of diamond paste and machine oil, diamond paste and machine oil volume ratio are 1:1 ~ 10, the granularity of diamond paste is Φ 40 μm ~ 10 μm, after having ground, spherome surface and valve base surface are cleaned up;
(2) smooth grinding: control spheroid rotating speed at 0.5rpm-10rpm, the grinding tool on lapping device is first adopted to grind spheroid, be ground to the preliminary mirror effect that fuzzy reflective inverted image appears in sphere, the grinding marks of each grinding part is even, Ra0.09 is less than to ball seal surface roughness, use valve seat instead and spheroid match grinding reaches preliminary mirror effect to valve seat and ball seal face in 5 ~ 30 minutes, Ra0.09 is less than to valve base sealing surface roughness, abradant abrasive material is diamond paste, the mixture of kerosene and micro crystal graphite, its percent by volume is diamond paste 10% ~ 30%, micro crystal graphite 10% ~ 35%, kerosene 45% ~ 70%, the granularity of diamond paste is Φ 10 μm ~ 5 μm, the granularity of micro crystal graphite is less than the granularity of diamond paste, after having ground, spheroid and valve base surface are cleaned up,
(3) fine abrasive: control spheroid rotating speed at below 5rpm, the grinding tool on lapping device is used to grind spheroid, be ground to the mirror effect can seeing clear reflective inverted image, Ra0.05 is less than to ball seal surface roughness, use valve seat instead and the mutual match grinding of spheroid reaches mirror effect to valve seat and sphere, be less than Ra0.05 to valve base sealing surface roughness; Abradant abrasive material is the mixture of diamond paste, micro crystal graphite and kerosene, its percent by volume is diamond paste 10% ~ 30%, micro crystal graphite 10% ~ 35%, kerosene 45% ~ 70%, the granularity of diamond paste is for being less than Φ 5 μm, the granularity of micro crystal graphite is less than the granularity of diamond paste, after having ground, spherome surface and valve base surface are cleaned up;
(4) valve seat and spheroid join ground and cleaned: spheroid is fixed, and evenly apply kerosene at spherome surface, and valve seat swings along spheroid and mutually grinds, to removing greasy dirt on spheroid and sealing surface of seat.
Reasonable: the step of described fine abrasive is divided into three times, three times fine abrasive is respectively Φ 5 μm ~ 2.5 μm, Φ 2.5 μm ~ 0.5 μm by the diamond paste granularity that grinding order uses successively and is less than Φ 0.5 μm, during each fine abrasive, adopt grinding tool grinding spheroid at least 3 minutes, valve seat and spheroid match grinding 5 ~ 10 minutes, and be finally less than Ra0.05 to spheroid and valve base sealing surface roughness, in mirror effect, after each grinding completes, spherome surface and valve base surface are cleaned up.
Reasonable: described coarse grinding step is divided into and carries out for three times, the diamond paste granularity wherein used successively by grinding order in three rough lappings is respectively Φ 40 μm ~ 28 μm, Φ 28 μm ~ 20 μm and Φ 14 μm ~ 10 μm, first time rough lapping is to removing grinding machine cut on spheroid and rounding spheroid, remove sealing surface of seat grinding machine cut and coincide with spheroid, when second time rough lapping and third time rough lapping, each grinding tool grinding at least 20 minutes, and final to ball seal surface roughness for being less than Ra0.2, use valve seat and spheroid match grinding 5 ~ 10 minutes instead, and final to valve base sealing surface roughness for being less than Ra0.2, after each grinding completes, spherome surface and valve base surface are cleaned up.
Reasonable: described smooth grinding step is divided into carries out for twice, the diamond paste granularity wherein used successively by grinding order in twice smooth grinding is respectively Φ 10 μm ~ 7 μm and Φ 7 μm ~ 5 μm, first time, smooth grinding presented sub-photochromic to the spheroid of spheroid and sealing surface of seat, spheroid and sealing surface of seat grinding marks even, second time smooth grinding presents preliminary mirror effect to the sphere on spheroid and valve seat, and be finally less than Ra0.09 to spheroid and valve base sealing surface roughness, after each smooth grinding completes, spherome surface and valve base surface are cleaned up.
Reasonable: in each step of described rough lapping, smooth grinding and fine abrasive, grinding tool and valve seat turn along spheroid and swing grinding in the opposite direction, and amplitude of fluctuation covers the whole sealing surface of spheroid.
Grinding technics of the present invention, corase grind adopts diamond paste and machine oil mixing, machine oil can ensure lubrication good in process of lapping and cooling-down effect, machine oil can ensure that diamond paste can stick on the ball seal face of needs grinding simultaneously, and valve seat, on grinding tool on corresponding abradant surface, diamond paste contacts with abradant surface reliably, and to control diamond paste granularity be Φ 40 μm ~ 10 μm, and corase grind adopts, and diamond paste is from coarse to fine to be ground, can cut on reliable worn spheroid and valve seat, and rounding spheroid; Smooth grinding is used instead by the diamond paste of certain percentage proportioning, micro crystal graphite and kerosene mixture, kerosene and micro crystal graphite have good lubricant effect, kerosene also has certain cleaning action, realize the cleaning of grinding limit, limit, use the diamond paste that granularity is less instead, smooth grinding adopts two steps to carry out simultaneously, realizes preliminary mirror effect; Again through fine abrasive, spheroid can be realized and sealing surface of seat is mirror effect, reach roughness for being less than Ra0.05, the facing-up eventually passing valve seat and spheroid cleans, not only realize cleaning action, eliminate the abrasive pastes being positioned at the micropore of spheroid and sealing surface of seat, and increase mirror effect, spheroid and valve seat are fitted like a glove, and it is Ra0.02 that the best can reach roughness; And in each grinding steps, being divided into some little steps simultaneously, diamond paste is from coarse to fine to be ground, and ensures to reach corresponding grinding effect, and grinding operation is convenient;
After last valve seat and spheroid join ground and cleaned, the surface roughness of test spheroid and sealing surface of seat can reach Ra0.02-0.05, when the surface roughness of spheroid and sealing surface of seat is low simultaneously, during valve opening and closing, operation moment of torsion is low, and valve opening and closing operation is light; And valve seat and ball seal performance good, valve seat is adsorbable on the sphere of spheroid, and under low-pressure nitrogen pressure testing 0.6Mpa No leakage, reach zero leakage.Below in conjunction with detailed description of the invention, the present invention is described further.
Accompanying drawing explanation
Fig. 1 is lapping device structural representation in the specific embodiment of the invention.
Detailed description of the invention
Below by embodiment, the present invention is specifically described; only be used to further illustrate the present invention; can not be interpreted as limiting the scope of the present invention, the technician in this field can make some nonessential improvement and adjustment according to the content of foregoing invention to the present invention.
Spheroid is placed on lapping device, lapping device is technology well known to those of ordinary skill in the art, as its general configuration of Fig. 1 is: the grinding tool 2 comprising frame 1 and cup-shaped, frame 1 is provided with drive motors 3, drive motors 3 exports and is connected with rotating disc 4, rotating disc 4 is fixed with the packing ring 5 for placing spheroid, spheroid is placed on packing ring 5, drive through drive motors 3 and rotate, grinding tool 2 is for grinding spheroid, and drive motors 3 controls output speed by frequency converter (not shown).
Spheroid after being processed by grinding machine and valve seat are processed by following grinding steps, and coarse grinding step is preferably three steps to carry out.
(1) rough lapping: preparation grinding abrasive material: a, diamond paste (granularity Φ 40 μm ~ 28 μm)+machine oil, be (diamond paste) 1:(machine oil by volume) 1 ~ 10 mixing, best is (diamond paste) 1:(machine oil) 1; B, diamond paste (granularity Φ 28 μm ~ 20 μm)+machine oil are (diamond paste) 1:(machine oil by volume) 1 ~ 10 mixing, best is (diamond paste) 1:(machine oil) 1; C, diamond paste (granularity Φ 14 μm ~ 10 μm)+machine oil are (diamond paste) 1:(machine oil by volume) 1 ~ 10 mixing, best is (diamond paste) 1:(machine oil) 1.
First rough lapping: select abrasive material a to be coated on the sphere of spheroid, controls spheroid rotating speed at 10rpm ~ 150rpm; First adopt grinding tool grinding, during grinding, grinding tool in the swing contrary with spheroid rotation direction, and swings the sealing surface that grinding scope covers whole spheroid; Operating personnel, by observing, the sphere (sealing surface) of spheroid do not have obvious grinding machine cut and after spheroid rounding, the diameter difference of roundness measuring equipment measurement spheroid can be adopted to be less than 5 μm, select valve seat and spheroid to carry out facing-up mill; During grinding, valve seat in the swing contrary with spheroid rotation direction, and swings the sealing surface that grinding scope covers whole spheroid, and without obvious cut on match grinding to sealing surface of seat, valve seat and spheroid are substantially identical, can be bonded to each other, do not have the observable gap of naked eyes; After first rough lapping completes, spheroid and valve seat are cleaned up, avoids residual particles.Second time rough lapping: select abrasive material b to be coated on the sphere (sealing surface) of spheroid, control spheroid rotating speed at 10rpm ~ 150rpm, first adopt grinding tool grinding at least 20 minutes, adopt roughness measuring instrument auxiliary judgment, detect ball seal surface roughness for being less than Ra0.4, carry out facing-up with valve seat and spheroid again and grind 5 ~ 10 minutes, and through roughness measuring instrument auxiliary judgment, detect valve base sealing surface roughness for being less than Ra0.4; During grinding, grinding tool, valve seat in the swing contrary with spheroid rotation direction, and swing the sealing surface that grinding scope covers whole spheroid; After having ground, spheroid and valve seat are cleaned up (can clean water be adopted, or Ultrasonic Cleaning, or wiping etc.), avoid spheroid and valve base surface residual particles.Third time rough lapping: select abrasive material c to be coated on the sphere of spheroid, control spheroid rotating speed at 10rpm ~ 150rpm, first adopt grinding tool grinding at least 20 minutes, and through roughness measuring instrument auxiliary judgment, detect ball seal surface roughness for being less than Ra0.2, carry out facing-up with valve seat and spheroid again and grind 5 ~ 10 minutes, and through roughness measuring instrument auxiliary judgment, detect valve base sealing surface roughness for being less than Ra0.2; During grinding, grinding tool, valve seat are in the swing contrary with spheroid rotation direction, and amplitude of fluctuation is more than Qiu Ding center; After having ground, spheroid and valve seat are cleaned up, avoids residual particles.
Three step grindings that rough lapping adopts diamond paste from coarse to fine, grind more convenient, be convenient to judge and reach corresponding grinding effect, grinding is better to be controlled, shorten the whole rough lapping time, the sphere of spheroid can eliminate obvious grinding machine cut completely, and by spheroid rounding, the sealing surface of spheroid and valve seat can be fitted, without clear gap.
Smooth grinding is carried out by following smooth grinding step by through the spheroid of rough lapping and valve seat; Smooth grinding is preferably twice to carry out.
(2) smooth grinding: preparation grinding abrasive material: d, diamond paste (Φ 10 μm ~ 7 μm)+micro crystal graphite (< Φ 10 μm)+kerosene, mix by the percent by volume proportioning of diamond paste 10% ~ 30%, micro crystal graphite 10% ~ 35%, kerosene 45% ~ 70%; E, diamond paste (Φ 7 μm ~ 5 μm)+micro crystal graphite (< Φ 7 μm)+kerosene, mix by the percent by volume proportioning of diamond paste 10% ~ 30%, micro crystal graphite 10% ~ 35%, kerosene 45% ~ 70%.In process of lapping, utilize lubrication and the grinding effect of micro crystal graphite, grind more meticulous, and the lubrication of kerosene, cooling and cleaning action, realize the cleaning of grinding limit, limit, convenient grinding.
First smooth grinding: select abrasive material d to be coated on the sphere of spheroid, control spheroid rotating speed at 0.5rpm-10rpm, first adopt grinding tool grinding, during grinding, grinding tool in the swing contrary with spheroid rotation direction, and swings the sealing surface that grinding scope covers whole spheroid; Operating personnel are by observing, and the sphere of spheroid presents sub-photochromic (turning white or burnt hair), and the grinding marks of each several part is even, and through roughness measuring instrument auxiliary judgment, detect ball seal surface roughness for being less than Ra0.1; Use valve seat instead and spheroid carries out facing-up mill, during grinding, valve seat is in the swing contrary with spheroid rotation direction, and swing the sealing surface that grinding scope covers whole spheroid, match grinding to sealing surface of seat presents sub-photochromic (turning white or burnt hair), and through roughness measuring instrument auxiliary judgment, detect valve base sealing surface roughness for being less than Ra0.1; After having ground, spheroid and valve seat are cleaned up, avoids residual particles.Second time smooth grinding: select abrasive material e to be coated on the sphere of spheroid, control spheroid rotating speed at 0.5rpm-10rpm, first adopt grinding tool grinding, during grinding, grinding tool in the swing contrary with spheroid rotation direction, and swings the sealing surface that grinding scope covers whole spheroid; Operating personnel are by observing, and the sphere be ground on spheroid presents preliminary mirror effect, and namely on spheroid sphere, polishing scratch is tiny, the sphere of spheroid can see fuzzy inverted image, spheroid sphere, in white, through roughmeter auxiliary judgment, is measured ball seal surface roughness and is less than Ra0.09; Use valve seat instead and spheroid facing-up grinds, during grinding, valve seat is in the swing contrary with spheroid rotation direction, and swing the sealing surface that grinding scope covers whole spheroid, be ground to sealing surface of seat and present preliminary mirror effect, through roughmeter auxiliary judgment, measure valve base sealing surface roughness and be less than Ra0.09.
Two step grindings that smooth grinding adopts diamond paste from coarse to fine, grind more convenient, be convenient to judge and reach corresponding grinding effect, process of lapping better controls, and shortens the whole smooth grinding time.
Fine abrasive is carried out by following fine abrasive step by through the spheroid of above-mentioned steps smooth grinding and valve seat; Super grinding is preferably three steps and carries out.
(3) fine abrasive: preparation grinding abrasive material: f, diamond paste (Φ 5 μm ~ 2.5 μm)+micro crystal graphite (< Φ 5 μm)+kerosene, mix by the percent by volume proportioning of diamond paste 10% ~ 30%, micro crystal graphite 10% ~ 35%, kerosene 45% ~ 70%; G, diamond paste (Φ 2.5 μm ~ 1 μm)+micro crystal graphite (< Φ 2.5 μm)+kerosene, mix by the percent by volume proportioning of diamond paste 10% ~ 30%, micro crystal graphite 10% ~ 35%, kerosene 45% ~ 70%; H, diamond paste (< Φ 0.5 μm)+micro crystal graphite (< Φ 0.5 μm)+kerosene, mix by the percent by volume proportioning of diamond paste 10% ~ 30%, micro crystal graphite 10% ~ 35%, kerosene 45% ~ 70%.
First fine abrasive: select abrasive material f to be coated on the sphere of spheroid, control spheroid rotating speed at below 5rpm, first adopt grinding tool grinding, during grinding, grinding tool grinds in the swing contrary with spheroid rotation direction, and swings the sealing surface that grinding scope covers whole spheroid; Grind at least 3 minutes, operating personnel are by observing, and the sphere of spheroid has inverted image more clearly; Use valve seat instead and spheroid carries out facing-up mill, during grinding, valve seat is in the swing contrary with spheroid rotation direction, and swing the sealing surface that grinding scope covers whole spheroid, match grinding 5 to 10 minutes, to sealing surface of seat, there is inverted image comparatively clearly, and through roughness measuring instrument auxiliary judgment, detect the sealing surface roughness of spheroid and valve seat for being less than Ra0.08; After having ground, spheroid and valve seat are cleaned up, avoids residual particles.Second time fine abrasive: select abrasive material g to be coated on the sphere of spheroid, control spheroid rotating speed at below 5rpm, first adopt grinding tool grinding, during grinding, grinding tool in the swing contrary with spheroid rotation direction, and swings the sealing surface that grinding scope covers whole spheroid; Grind at least 3 minutes, operating personnel are by observing, and the sphere of spheroid can have inverted image clearly, namely presents mirror effect; Use valve seat instead and spheroid carries out facing-up mill, during grinding, valve seat is in the swing contrary with spheroid rotation direction, and swing the sealing surface that grinding scope covers whole spheroid, match grinding 5 to 10 minutes, sealing surface of seat has inverted image clearly, namely presents mirror effect, and through roughness measuring instrument auxiliary judgment, detect roughness and be less than Ra0.06; After having ground, spheroid and valve seat are cleaned up, avoids residual particles.Fine abrasive for the third time: select abrasive material h to be coated on the sphere of spheroid, control spheroid rotating speed at below 5rpm, first adopt grinding tool grinding, during grinding, grinding tool in the swing contrary with spheroid rotation direction, and swings the sealing surface that grinding scope covers whole spheroid; Grind at least 3 minutes, operating personnel are by observing, and the sphere of spheroid can have inverted image clearly, in mirror effect; Use valve seat instead and spheroid carries out facing-up mill, during grinding, valve seat is in the swing contrary with spheroid rotation direction, and swing the sealing surface that grinding scope covers whole spheroid, match grinding 5 to 10 minutes, sealing surface of seat has inverted image clearly, i.e. mirror effect, and through roughness measuring instrument auxiliary judgment, detection spheroid and valve base sealing surface roughness are less than Ra0.05; After having ground, spheroid and valve seat are cleaned up, avoids residual particles.
Three step grindings that fine abrasive adopts diamond paste from coarse to fine, grind more convenient, be convenient to judge and reach corresponding grinding effect, grinding better controls, and shortens the whole fine abrasive time.
Undertaken through the spheroid of above-mentioned steps fine abrasive and valve seat by grinding cleaning step with lower valve base and spheroid facing-up;
(4) valve seat and spheroid join ground and cleaned: spheroid is fixed, spheroid evenly applies kerosene, valve seat is beat grinding on spheroid, be ground to valve seat and spheroid wipe oil, usually after being ground to spheroid and valve seat wipe oil, also need the mutual grinding through at least 2 minutes, it is reflective that the sphere finally reaching spheroid reaches minute surface, ensures spheroid and the goodness of fit of valve seat and the mirror effect of both sealing surfaces like this.Reach the abrasive pastes eliminating the micropore be positioned on spheroid and sealing surface of seat like this, finally reach the mirror ultrafinish effect of roughness Ra 0.02-0.05, valve seat can be adsorbed on the sphere of spheroid.
After above-mentioned steps, sphere and valve base surface present minute surface, can see reflective inverted image clearly; Carry out roughness measurement with the sealing surface of surface roughometer to the sphere of spheroid and valve seat, surface roughness Ra 0.02-0.05 detected; Valve seat is adsorbable on spheroid sphere; And under low-pressure nitrogen pressure testing 0.6Mpa, No leakage.
Claims (6)
1. a ball valve sealing face grinding technics, is placed in spheroid on the spin finishing platform of lapping device, it is characterized in that: carry out according to following grinding steps:
(1) rough lapping: control spheroid rotating speed at 10rpm ~ 150rpm, the grinding tool on lapping device is first adopted to grind spheroid, be ground to and remove grinding machine cut on spheroid and rounding spheroid, use valve seat and spheroid instead to be mutually ground to and to remove grinding machine cut on sealing surface of seat, abradant abrasive material is the mixture of diamond paste and machine oil, diamond paste and machine oil volume ratio are 1:1 ~ 10, the granularity of diamond paste is Φ 40 μm ~ 10 μm, after having ground, spherome surface and valve base surface are cleaned up;
(2) smooth grinding: control spheroid rotating speed at 0.5rpm-10rpm, the grinding tool on lapping device is first adopted to grind spheroid, be ground to the preliminary mirror effect that fuzzy reflective inverted image appears in sphere, the grinding marks of each grinding part is even, Ra0.09 is less than to ball seal surface roughness, use valve seat instead and spheroid match grinding reaches preliminary mirror effect to valve seat and ball seal face in 5 ~ 30 minutes, Ra0.09 is less than to valve base sealing surface roughness, abradant abrasive material is diamond paste, the mixture of kerosene and micro crystal graphite, its percent by volume is diamond paste 10% ~ 30%, micro crystal graphite 10% ~ 35%, kerosene 45% ~ 70%, the granularity of diamond paste is Φ 10 μm ~ 5 μm, the granularity of micro crystal graphite is less than the granularity of diamond paste, after having ground, spheroid and valve base surface are cleaned up,
(3) fine abrasive: control spheroid rotating speed at below 5rpm, the grinding tool on lapping device is used to grind spheroid, be ground to the mirror effect can seeing clear reflective inverted image, Ra0.05 is less than to ball seal surface roughness, use valve seat instead and the mutual match grinding of spheroid reaches mirror effect to valve seat and sphere, be less than Ra0.05 to valve base sealing surface roughness; Abradant abrasive material is the mixture of diamond paste, micro crystal graphite and kerosene, its percent by volume is diamond paste 10% ~ 30%, micro crystal graphite 10% ~ 35%, kerosene 45% ~ 70%, the granularity of diamond paste is for being less than Φ 5 μm, the granularity of micro crystal graphite is less than the granularity of diamond paste, after having ground, spherome surface and valve base surface are cleaned up;
(4) valve seat and spheroid join ground and cleaned: spheroid is fixed, and evenly apply kerosene at spherome surface, and valve seat swings along spheroid and mutually grinds, to removing greasy dirt on spheroid and sealing surface of seat.
2. ball valve sealing face grinding technics according to claim 1, it is characterized in that: the step of described fine abrasive is divided into three times, three times fine abrasive is respectively Φ 5 μm ~ 2.5 μm by the diamond paste granularity that grinding order uses successively, Φ 2.5 μm ~ 0.5 μm and be less than Φ 0.5 μm, during each fine abrasive, adopt grinding tool grinding spheroid at least 3 minutes, valve seat and spheroid match grinding 5 ~ 10 minutes, and be finally less than Ra0.05 to spheroid and valve base sealing surface roughness, in mirror effect, after each grinding completes, spherome surface and valve base surface are cleaned up.
3. ball valve sealing face grinding technics according to claim 1 or 2, it is characterized in that: described coarse grinding step is divided into and carries out for three times, the diamond paste granularity wherein used successively by grinding order in three rough lappings is respectively Φ 40 μm ~ 28 μm, Φ 28 μm ~ 20 μm and Φ 14 μm ~ 10 μm, first time rough lapping is to removing grinding machine cut on spheroid and rounding spheroid, remove sealing surface of seat grinding machine cut and coincide with spheroid, when second time rough lapping and third time rough lapping, each grinding tool grinding at least 20 minutes, and final to ball seal surface roughness for being less than Ra0.2, use valve seat and spheroid match grinding 5 ~ 10 minutes instead, and final to valve base sealing surface roughness for being less than Ra0.2, after each grinding completes, spherome surface and valve base surface are cleaned up.
4. ball valve sealing face grinding technics according to claim 1 or 2, it is characterized in that: described smooth grinding step is divided into carries out for twice, the diamond paste granularity wherein used successively by grinding order in twice smooth grinding is respectively Φ 10 μm ~ 7 μm and Φ 7 μm ~ 5 μm, first time, smooth grinding presented sub-photochromic to the spheroid of spheroid and sealing surface of seat, spheroid and sealing surface of seat grinding marks even, second time smooth grinding presents preliminary mirror effect to the sphere on spheroid and valve seat, and be finally less than Ra0.09 to spheroid and valve base sealing surface roughness, after each smooth grinding completes, spherome surface and valve base surface are cleaned up.
5. ball valve sealing face grinding technics according to claim 3, it is characterized in that: described smooth grinding step is divided into carries out for twice, the diamond paste granularity wherein used successively by grinding order in twice smooth grinding is respectively Φ 10 μm ~ 7 μm and Φ 7 μm ~ 5 μm, first time, smooth grinding presented sub-photochromic to the spheroid of spheroid and sealing surface of seat, spheroid and sealing surface of seat grinding marks even, second time smooth grinding presents preliminary mirror effect to the sphere on spheroid and valve seat, and be finally less than Ra0.09 to spheroid and valve base sealing surface roughness, after each smooth grinding completes, spherome surface and valve base surface are cleaned up.
6. ball valve sealing face grinding technics according to claim 1, it is characterized in that: in each step of described rough lapping, smooth grinding and fine abrasive, grinding tool and valve seat turn along spheroid and swing grinding in the opposite direction, and amplitude of fluctuation covers the whole sealing surface of spheroid.
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Effective date of registration: 20151228 Address after: 325000, Zhejiang Wenzhou Longwan District Yongxing Street Pearl Road, No. 597 office building on the third floor Patentee after: WENZHOU ARTECH MACHINERY TECHNOLOGY CO., LTD. Address before: 325000 Zhejiang Wenzhou Longwan District Yongxing Street valve base four road four Patentee before: Zhejiang Ruilaishi Machinery Co., Ltd. |