CN111911648B - Valve ball and processing method thereof - Google Patents
Valve ball and processing method thereof Download PDFInfo
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- CN111911648B CN111911648B CN202010514931.9A CN202010514931A CN111911648B CN 111911648 B CN111911648 B CN 111911648B CN 202010514931 A CN202010514931 A CN 202010514931A CN 111911648 B CN111911648 B CN 111911648B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0605—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor with particular plug arrangements, e.g. particular shape or built-in means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
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Abstract
The invention discloses a valve ball and a processing method thereof, wherein the valve ball comprises a wear-resistant ball core body, the wear-resistant ball core body is provided with a flow channel for medium circulation, the inner wall of the flow channel and the outer wall surface of the wear-resistant ball core body are both provided with wear-resistant layers, the outer wall surface of the wear-resistant ball core body is provided with an insertion groove, the insertion groove is rectangular and is not communicated with the flow channel, and the wear-resistant ball core body is prepared from a titanium alloy material.
Description
Technical Field
The invention relates to the technical field of valve spheres, in particular to a valve sphere and a processing method thereof.
Background
Ball valves (ball valve is a stop valve in the marine and marine fields), defined in standard GB/T21465-2008 "valve nomenclature" as valves in which the closure member (ball) is carried by a valve stem and rotates about the axis of the ball valve. The hard seal V-shaped ball valve can also be used for regulating and controlling fluid, wherein a V-shaped ball core of the hard seal V-shaped ball valve and a metal valve seat of the build-up welding hard alloy have strong shearing force, and the hard seal V-shaped ball valve is particularly suitable for media containing fibers, tiny solid particles and the like. The multi-way ball valve can flexibly control the confluence, the diversion and the switching of the flow direction of the medium on the pipeline, and can close any channel to connect the other two channels. The valve of this type should be generally installed horizontally in the pipeline. Ball valve classification, including pneumatic ball valve, electric ball valve and manual ball valve.
Important part is the spheroid in the ball valve, because the working process and the environment of use of ball valve for the spheroid can produce wearing and tearing in long-time use, and the medium of carrying also can produce the corrosive action to the spheroid in the ball valve, and current spheroid is because the restriction of self material, kills and falls wear-resisting and corrosion-resistant effect poor, thereby makes spheroidal life reduce, for this, we provide a valve spheroid and processing method thereof.
Disclosure of Invention
The invention aims to provide a valve ball body and a processing method thereof, and aims to solve the problems that in the background technology, due to the working process and the using environment of a ball valve, the ball body is abraded in the long-time using process, a conveyed medium can also corrode the ball body in the ball valve, and the service life of the ball body is shortened due to the limitation of the material of the existing ball body and the poor effects of abrasion resistance and corrosion resistance of the existing ball body.
In order to achieve the purpose, the invention provides the following technical scheme: the valve ball body and the processing method thereof comprise a wear-resistant ball core body, wherein the wear-resistant ball core body is provided with a flow channel for medium circulation, wear-resistant layers are arranged on the inner wall of the flow channel and the outer wall surface of the wear-resistant ball core body, an insertion groove is arranged on the outer wall surface of the wear-resistant ball core body, the insertion groove is rectangular and is not communicated with the flow channel, and the wear-resistant ball core body is made of a titanium alloy material.
Preferably, the wear-resistant layer is formed by spraying wear-resistant paint.
A processing method of a valve ball comprises the following steps:
s1, preparing a titanium alloy round steel rod:
(1) Raw materials: WC:35% -45%, ni: 6-10%, zr:1% -3%, pr:0.2% -0.7%, fe:5% -9%, cu:5% -9%, si:5 to 6 percent and the balance of TiC;
(2) Preparing raw materials of each component according to the weight percentage of each component, adding TiC, WC, ni, zr, pr, fe, cu and Si into an electric furnace for melting, wherein the melting temperature is 1800-1900 ℃, pouring a titanium alloy solution into a mould of a round steel rod after the melting is finished, after injection molding, waiting for cooling, and taking out the round steel rod after the cooling is finished;
s2, cutting the blank: cutting the prepared round steel bar into sections according to the size required by the valve ball body, and sawing the round steel bar into round steel section blanks through a sawing machine during cutting;
s3, stamping a valve ball blank: the temperature of the working environment of the intermediate frequency furnace is not higher than 40 ℃, the relative humidity is not more than 85%, the three-phase cross flow pressure is 380V, the frequency is 50HZ, the temperature of the intermediate frequency furnace is set to be 1100-1200 ℃, the heating time is 15-20 minutes, whether the cooling water of the intermediate frequency furnace is normal or not is checked, the pH value of the cooling water is 6-8, the resistivity is 20k omega/CM, the water inlet temperature is 5-30 ℃, and the inlet water pressure is 0.12-0.15Mpa;
putting a round steel section billet into an intermediate frequency furnace, starting a power supply of the intermediate frequency furnace, converting alternating current into direct current by a power supply device of the intermediate frequency furnace, converting the direct current into intermediate frequency current, generating high-density magnetic lines through an induction coil, cutting a metal workpiece arranged in the coil to enable the interior of metal to generate heat to achieve the purpose of heating, heating the round steel section billet, removing oxide skin on the surface of the round steel section billet after heating is finished, and manufacturing the round steel section billet into a ball valve ball blank by utilizing a punch press;
s4, fine processing:
(1) Feeding the round steel section blank into a static pressure machine, placing the round steel section blank on a steel bracket, pressurizing and compacting, wherein the pressurizing pressure is 145-155 MPa, the pressing time is 3-4.5 minutes, and releasing pressure after pressing is finished; pressing to obtain a preliminary shape of the valve ball, adjusting the pressing angle of a ball die, and pressing for multiple times;
(2) Carrying out vacuum sintering treatment on the valve ball after press forming, putting the ball mould subjected to press forming into a vacuum furnace, setting the vacuum furnace as a negative pressure value, rapidly heating the temperature in the furnace to 1050 ℃, reducing the heating speed, and finally keeping the temperature at 1500 +/-20 ℃ for 120 minutes;
(3) Putting the valve ball into a closed heat treatment furnace for annealing treatment, vacuumizing the heat treatment furnace, then introducing inert gas for heating annealing, and continuously introducing the inert gas, wherein the inert gas has scouring pressure of 8-10 kg on each square centimeter of the surface of the round steel section billet;
(4) Submerging the valve ball, grinding, and finely machining the eccentric arc groove by using a forming cutter according to the specification of a ball body to be ground, wherein the machining precision is +/-3 microns, and the size of the ball body is ensured to be matched with that of the grinding groove; the ball grinding process comprises coarse grinding, fine grinding, coarse grinding, fine grinding and polishing;
s5, spraying a wear-resistant layer: and placing the ball valve ball blank after punching on a grinding machine, grinding the ball valve ball blank to be flat by using the grinding machine, and then spraying the wear-resistant layer on the surface of the ball valve ball blank to form a product.
Preferably, the weight percentage of the raw materials is WC:40%, ni:8%, zr:2%, pr:0.5%, fe:7%, cu:7%, si:5.5% and the balance TiC.
Preferably, the weight percentage of the raw materials is WC:35%, ni:6%, zr:1%, pr:0.2%, fe:5%, cu:5%, si:5% and the balance TiC.
Preferably, the weight percentage of the raw materials is WC:45%, ni:10%, zr:3% and Pr:0.7%, fe:9%, cu:9%, si:6% and the balance TiC;
preferably, a decorticator is used for descaling the surface of the heated round steel billet.
Preferably, the wear-resistant layer is formed by mixing 20-30% of acrylic resin, 30-40% of epoxy resin, 10-15% of silicon carbide, 5-15% of tungsten carbide, 5-10% of manganese carbide and 10-15% of inorganic filler.
Preferably, in the step S4, in the fine processing, after the finish lapping, a digital display micrometer is used for measuring, at least 20 points are taken on the spherical surface, and the sphericity measurement precision can be controlled within a range of 2 μm; after polishing, measuring by using a high-precision roundness measuring instrument; each batch of hard alloy spheres to be detected are cleaned by wiping with cotton yarn dipped with alcohol, and are placed for 3 hours in a constant room temperature environment, and the spheres are measured after the temperature of the spheres is consistent with the temperature of the measurement environment; the sphere to be measured is sequentially aligned with three cross sections which are mutually vertical in space, when the roundness value of each cross section is less than 1 mu m, the sphericity of the sphere is qualified, and the sphericity value is the average value of 3 measurement results.
The invention provides a valve ball and a processing method thereof, which have the following beneficial effects:
(1) According to the invention, the wear-resistant ball core body is prepared from the titanium alloy material, so that the hardness of the wear-resistant ball core body is higher, and the wear-resistant and corrosion-resistant effects are better.
(2) The titanium alloy material formed by mixing TiC, WC, ni, zr, pr, fe, cu and Si has high hardness, improved corrosion resistance and wear resistance, and the material formed by the reaction and polymerization of the compositions has lighter weight and good performance.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an internal view of the present invention;
FIG. 3 is a schematic side view of the present invention.
In the figure: 1. a wear-resistant ball core body; 2. inserting grooves; 3. a flow channel; 4. and a wear-resistant layer.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
As shown in fig. 1-3, the present invention provides a technical solution: the valve ball body comprises a wear-resistant ball core body 1, wherein the wear-resistant ball core body 1 is provided with a flow channel 3 for medium circulation, wear-resistant layers 4 are arranged on the inner wall of the flow channel 3 and the outer wall surface of the wear-resistant ball core body 1, an insertion groove 2 is arranged on the outer wall surface of the wear-resistant ball core body 1, the insertion groove 2 is rectangular and the insertion groove 2 is not communicated with the flow channel 3, and the wear-resistant ball core body 1 is made of a titanium alloy material.
The wear-resistant layer 4 is formed by spraying wear-resistant paint, and the wear-resistant effect is further enhanced by the wear-resistant layer 4.
It should be noted that, during operation, the wear-resistant ball core 1 of the valve ball body is made of the titanium alloy material, so that the hardness of the wear-resistant ball core 1 is higher, and the wear-resistant and corrosion-resistant effects are better, and meanwhile, the wear-resistant layer 4 is sprayed on the inner portion of the flow channel 3 of the wear-resistant ball core 1 and the outer wall of the wear-resistant ball core 1, so that the wear-resistant effect is further enhanced, and the service life of the valve ball body is prolonged by improving the wear-resistant effect.
Example 2
The method comprises the following steps:
s1, preparing a titanium alloy round steel rod:
(1) Raw materials: WC:35%, ni:6%, zr:1%, pr:0.2%, fe:5%, cu:5%, si:5% and the balance TiC;
(2) Preparing raw materials of each component according to the weight percentage of each component, adding the raw materials of TiC, WC, ni, zr, pr, fe, cu and Si into an electric furnace for melting, wherein the melting temperature is 1800-1900 ℃, pouring a titanium alloy solution into a mould of a round steel rod after the melting is finished, waiting for cooling after injection molding, and taking out the round steel rod after the cooling is finished;
s2, cutting the blank: cutting the prepared round steel bar into sections according to the size required by the valve ball body, and sawing the round steel bar into round steel section blanks through a sawing machine during cutting;
s3, stamping a valve ball blank: the temperature of the working environment of the intermediate frequency furnace is not higher than 40 ℃, the relative humidity is not more than 85%, the three-phase cross flow pressure is 380V, the frequency is 50HZ, the temperature of the intermediate frequency furnace is set to be 1100-1200 ℃, the heating time is 15-20 minutes, whether the cooling water of the intermediate frequency furnace is normal or not is checked, the pH value of the cooling water is 6-8, the resistivity is 20k omega/CM, the water inlet temperature is 5-30 ℃, and the inlet water pressure is 0.12-0.15Mpa;
putting the round steel section billet into an intermediate frequency furnace, starting a power supply of the intermediate frequency furnace, converting alternating current into direct current by a power supply device of the intermediate frequency furnace, converting the direct current into intermediate frequency current, generating high-density magnetic lines through an induction coil, cutting a metal workpiece arranged in the coil to enable the interior of metal to generate heat to achieve the heating purpose, thereby heating the round steel section billet, removing oxide skin on the surface of the round steel section billet after heating, and manufacturing the round steel section billet into a ball valve ball blank by using a punch press;
s4, fine processing:
(1) Feeding the round steel section blank into a static pressure machine, placing the round steel section blank on a steel bracket, pressurizing and compacting, wherein the pressurizing pressure is 145-155 MPa, the pressing time is 3-4.5 minutes, and the pressure is released after the pressing is finished; pressing to obtain a preliminary shape of the valve ball, adjusting the pressing angle of a ball die, and pressing for multiple times;
(2) Carrying out vacuum sintering treatment on the valve ball after compression molding, putting the ball mold subjected to compression molding into a vacuum furnace, setting the vacuum furnace as a negative pressure value, rapidly heating the temperature in the vacuum furnace to 1050 ℃, reducing the heating speed, and finally keeping the temperature at 1500 +/-20 ℃ for 120 minutes;
(3) Putting the valve ball into a closed heat treatment furnace for annealing treatment, vacuumizing the heat treatment furnace, then introducing inert gas for heating annealing, and continuously introducing the inert gas, wherein the inert gas has scouring pressure of 8-10 kg on each square centimeter of the surface of the round steel section billet;
(4) Submerging the valve ball, grinding, and finely machining the eccentric arc groove by using a forming cutter according to the specification of a ball body to be ground, wherein the machining precision is +/-3 microns, and the size of the ball body is ensured to be matched with that of the grinding groove; the ball grinding process comprises coarse grinding, fine grinding, coarse grinding, fine grinding and polishing;
(5) After finishing the fine grinding, measuring by adopting a digital display micrometer, taking at least 20 points on the spherical surface, and controlling the sphericity measurement precision within the range of 2 mu m; after polishing, measuring by using a high-precision roundness measuring instrument; each batch of hard alloy spheres to be detected are cleaned by wiping with cotton yarn dipped with alcohol, and are placed for 3 hours in a constant room temperature environment, and the spheres are measured after the temperature of the spheres is consistent with the temperature of the measurement environment; the sphere to be measured is sequentially aligned with three cross sections which are mutually vertical in space, when the roundness value of each cross section is less than 1 mu m, the sphericity of the sphere is qualified, and the sphericity value is the average value of 3 measurement results;
s5, spraying a wear-resistant layer:
(1) Preparing a wear-resistant layer: selecting 20% of acrylic resin, 30% of epoxy resin, 10% of silicon carbide, 15% of tungsten carbide, 10% of manganese carbide and 15% of inorganic filler in percentage by weight, putting the acrylic resin, the epoxy resin, the silicon carbide, the 1% of tungsten carbide, the manganese carbide and the inorganic filler into a container, heating and stirring the materials, uniformly mixing the materials, and finally preparing the wear-resistant coating;
(2) Spraying a wear-resistant layer: and (3) putting the coating into wear-resistant coating spraying equipment, and then placing the ball blank of the ball valve on the spraying equipment for spraying a wear-resistant layer to form the wear-resistant layer on the surface.
Example 3
The method comprises the following steps:
s1, preparing a titanium alloy round steel rod:
(1) Raw materials: WC:40%, ni:8%, zr:2%, pr:0.5%, fe:7%, cu:7%, si:5.5% and the balance TiC;
(2) Preparing raw materials of each component according to the weight percentage of each component, adding the raw materials of TiC, WC, ni, zr, pr, fe, cu and Si into an electric furnace for melting, wherein the melting temperature is 1800-1900 ℃, pouring a titanium alloy solution into a mould of a round steel rod after the melting is finished, waiting for cooling after injection molding, and taking out the round steel rod after the cooling is finished;
s2, cutting the blank: cutting the prepared round steel bar into sections according to the size required by the valve ball body, and sawing the round steel bar into round steel section blanks through a sawing machine during cutting;
s3, stamping a valve ball blank: the temperature of the working environment of the intermediate frequency furnace is not higher than 40 ℃, the relative humidity is not more than 85%, the three-phase cross flow pressure is 380V, the frequency is 50HZ, the temperature of the intermediate frequency furnace is set to be 1100-1200 ℃, the heating time is 15-20 minutes, whether the cooling water of the intermediate frequency furnace is normal or not is checked, the pH value of the cooling water is 6-8, the resistivity is 20k omega/CM, the water inlet temperature is 5-30 ℃, and the inlet water pressure is 0.12-0.15Mpa;
putting the round steel section billet into an intermediate frequency furnace, starting a power supply of the intermediate frequency furnace, converting alternating current into direct current by a power supply device of the intermediate frequency furnace, converting the direct current into intermediate frequency current, generating high-density magnetic lines through an induction coil, cutting a metal workpiece arranged in the coil to enable the interior of metal to generate heat to achieve the heating purpose, thereby heating the round steel section billet, removing oxide skin on the surface of the round steel section billet after heating, and manufacturing the round steel section billet into a ball valve ball blank by using a punch press;
s4, fine processing:
(1) Feeding the round steel section blank into a static pressure machine, placing the round steel section blank on a steel bracket, pressurizing and compacting, wherein the pressurizing pressure is 145-155 MPa, the pressing time is 3-4.5 minutes, and the pressure is released after the pressing is finished; pressing to obtain a preliminary shape of the valve ball, adjusting the pressing angle of a ball die, and pressing for multiple times;
(2) Carrying out vacuum sintering treatment on the valve ball after compression molding, putting the ball mold subjected to compression molding into a vacuum furnace, setting the vacuum furnace as a negative pressure value, rapidly heating the temperature in the vacuum furnace to 1050 ℃, reducing the heating speed, and finally keeping the temperature at 1500 +/-20 ℃ for 120 minutes;
(3) Putting the valve ball into a closed heat treatment furnace for annealing treatment, vacuumizing the heat treatment furnace, then introducing inert gas for heating annealing, and continuously introducing the inert gas, wherein the inert gas has scouring pressure of 8-10 kg on each square centimeter of the surface of the round steel section billet;
(4) Submerging the valve ball, grinding, and finely machining the eccentric arc groove by using a forming cutter according to the specification of a ball body to be ground, wherein the machining precision is +/-3 microns, and the size of the ball body is ensured to be matched with that of the grinding groove; the ball grinding process comprises coarse grinding, fine grinding, coarse grinding, fine grinding and polishing;
(5) After finishing the fine grinding, measuring by adopting a digital display micrometer, taking at least 20 points on the spherical surface, and controlling the sphericity measurement precision within the range of 2 mu m; after polishing, measuring by using a high-precision roundness measuring instrument; each batch of hard alloy spheres to be detected are cleaned by cotton yarn dipped with alcohol and are placed for 3 hours in a constant room temperature environment, and the temperature of the spheres is measured after being consistent with the temperature of the measurement environment; the sphere to be measured is sequentially aligned with three cross sections which are mutually vertical in space, when the roundness value of each cross section is less than 1 mu m, the sphericity of the sphere is qualified, and the sphericity value is the average value of 3 measurement results;
s5, spraying a wear-resistant layer:
(1) Preparing a wear-resistant layer: selecting 25% of acrylic resin, 35% of epoxy resin, 10% of silicon carbide, 10% of tungsten carbide, 8% of manganese carbide and 12% of inorganic filler in percentage by weight, putting the acrylic resin, the epoxy resin, the silicon carbide, the 1% of tungsten carbide, the manganese carbide and the inorganic filler into a container, heating and stirring, uniformly mixing, and finally preparing the wear-resistant coating;
(2) Spraying a wear-resistant layer: and (3) putting the coating into wear-resistant coating spraying equipment, and then placing the ball blank of the ball valve on the spraying equipment for spraying a wear-resistant layer to form the wear-resistant layer on the surface.
Example 4
The method comprises the following steps:
s1, preparing a titanium alloy round steel rod:
(1) Raw materials: WC:45%, ni:10%, zr:3% and Pr:0.7%, fe:9%, cu:9%, si:6% and the balance TiC;
(2) Preparing raw materials of each component according to the weight percentage of each component, adding the raw materials of TiC, WC, ni, zr, pr, fe, cu and Si into an electric furnace for melting, wherein the melting temperature is 1800-1900 ℃, pouring a titanium alloy solution into a mould of a round steel rod after the melting is finished, waiting for cooling after injection molding, and taking out the round steel rod after the cooling is finished;
s2, cutting the blank: cutting the prepared round steel bar into sections according to the size required by the valve ball body, and sawing the round steel bar into round steel section billets for blanking through a sawing machine during cutting;
s3, stamping a valve ball blank: the temperature of the working environment of the intermediate frequency furnace is not higher than 40 ℃, the relative humidity is not more than 85%, the three-phase cross flow pressure is 380V, the frequency is 50HZ, the temperature of the intermediate frequency furnace is set to be 1100-1200 ℃, the heating time is 15-20 minutes, whether the cooling water of the intermediate frequency furnace is normal or not is checked, the pH value of the cooling water is 6-8, the resistivity is 20k omega/CM, the water inlet temperature is 5-30 ℃, and the inlet water pressure is 0.12-0.15Mpa;
putting the round steel section billet into an intermediate frequency furnace, starting a power supply of the intermediate frequency furnace, converting alternating current into direct current by a power supply device of the intermediate frequency furnace, converting the direct current into intermediate frequency current, generating high-density magnetic lines through an induction coil, cutting a metal workpiece arranged in the coil to enable the interior of metal to generate heat to achieve the heating purpose, thereby heating the round steel section billet, removing oxide skin on the surface of the round steel section billet after heating, and manufacturing the round steel section billet into a ball valve ball blank by using a punch press;
s4, fine processing:
(1) Feeding the round steel section blank into a static pressure machine, placing the round steel section blank on a steel bracket, pressurizing and compacting, wherein the pressurizing pressure is 145-155 MPa, the pressing time is 3-4.5 minutes, and releasing pressure after pressing is finished; pressing to obtain a preliminary shape of the valve ball, adjusting the pressing angle of a ball die, and pressing for multiple times;
(2) Carrying out vacuum sintering treatment on the valve ball after compression molding, putting the ball mold subjected to compression molding into a vacuum furnace, setting the vacuum furnace as a negative pressure value, rapidly heating the temperature in the vacuum furnace to 1050 ℃, reducing the heating speed, and finally keeping the temperature at 1500 +/-20 ℃ for 120 minutes;
(3) Putting the valve ball into a closed heat treatment furnace for annealing treatment, vacuumizing the heat treatment furnace, then introducing inert gas for heating annealing, and continuously introducing the inert gas, wherein the inert gas has scouring pressure of 8-10 kg on each square centimeter of the surface of the round steel section billet;
(4) Submerging the valve ball, grinding, and finely machining the eccentric arc groove by using a forming cutter according to the specification of a ball body to be ground, wherein the machining precision is +/-3 microns, and the size of the ball body is ensured to be matched with that of the grinding groove; the ball grinding process comprises coarse grinding, fine grinding, coarse grinding, fine grinding and polishing;
(5) After finishing the fine grinding, measuring by adopting a digital display micrometer, taking at least 20 points on the spherical surface, and controlling the sphericity measurement precision within the range of 2 mu m; after polishing, measuring by using a high-precision roundness measuring instrument; each batch of hard alloy spheres to be detected are cleaned by cotton yarn dipped with alcohol and are placed for 3 hours in a constant room temperature environment, and the temperature of the spheres is measured after being consistent with the temperature of the measurement environment; the sphere to be measured is sequentially aligned with three cross sections which are mutually vertical in space, when the roundness value of each cross section is less than 1 mu m, the sphericity of the sphere is qualified, and the sphericity value is the average value of 3 measurement results;
s5, spraying a wear-resistant layer:
(1) Preparing a wear-resistant layer: selecting 30% of acrylic resin, 40% of epoxy resin, 10% of silicon carbide, 5% of tungsten carbide, 5% of manganese carbide and 10% of inorganic filler by weight, putting the acrylic resin, the epoxy resin, the silicon carbide, the tungsten carbide, the manganese carbide and the inorganic filler into a container, heating and stirring, uniformly mixing, and finally preparing the wear-resistant coating;
(2) Spraying a wear-resistant layer: and (3) putting the coating into wear-resistant coating spraying equipment, and then placing the ball blank of the ball valve on the spraying equipment for spraying a wear-resistant layer to form the wear-resistant layer on the surface.
Example 5
The spheres prepared in example 2, example 3 and example 4 were tested for their wear resistance for 72 hours and their annual corrosion rate in 15% hydrochloric acid and 20% sulphuric acid, giving the following table:
| examples | Abrasion loss g | 15% hydrochloric acid mm/a | 20% sulfuric acid mm/a |
| Example 2 | 0.14 | 0.0051 | 0.0072 |
| Example 3 | 0.12 | 0.0045 | 0.0067 |
| Example 4 | 0.15 | 0.0067 | 0.0080 |
It can be seen from the above table that the corrosion resistance and wear resistance of the spheres prepared in examples 2-4 are good.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A processing method of a valve ball body is characterized in that: the valve ball body comprises a wear-resistant ball core body (1), wherein the wear-resistant ball core body (1) is provided with a flow channel (3) for medium circulation, wear-resistant layers (4) are arranged on the inner wall of the flow channel (3) and the outer wall surface of the wear-resistant ball core body (1), the outer wall surface of the wear-resistant ball core body (1) is provided with an insertion groove (2), the insertion groove (2) is rectangular, the insertion groove (2) is not communicated with the flow channel (3), the wear-resistant ball core body (1) is made of a titanium alloy material, and the wear-resistant layers (4) are formed by spraying wear-resistant paint;
the processing method of the valve ball comprises the following steps:
s1, preparing a titanium alloy round steel rod:
(1) Raw materials: WC:35% -45%, ni: 6-10%, zr:1% -3%, pr:0.2 to 0.7 percent,
Fe:5% -9%, cu:5% -9%, si:5% -6% and the balance of TiC;
(2) Preparing raw materials of each component according to the weight percentage of each component, adding the raw materials of TiC, WC, ni, zr, pr, fe, cu and Si into an electric furnace for melting, wherein the melting temperature is 1800-1900 ℃, pouring a titanium alloy solution into a round steel bar die after the melting is finished, after injection molding, waiting for cooling, and taking out the round steel bar after the cooling is finished;
s2, cutting the blank: cutting the prepared round steel bar into sections according to the size required by the valve ball body, and sawing the round steel bar into round steel section blanks through a sawing machine during cutting;
s3, stamping a valve ball blank: the temperature of the working environment of the intermediate frequency furnace is not higher than 40 ℃, the relative humidity is not more than 85%, the three-phase cross flow pressure is 380V, the frequency is 50HZ, the temperature of the intermediate frequency furnace is set to be 1100-1200 ℃, the heating time is 15-20 minutes, whether the cooling water of the intermediate frequency furnace is normal is checked, the pH value of the cooling water is 6-8, the resistivity is 20 kOmega/CM, the water inlet temperature is 5-30 ℃, and the inlet water pressure is 0.12-0.15Mpa;
putting the round steel section billet into an intermediate frequency furnace, starting a power supply of the intermediate frequency furnace, converting alternating current into direct current by a power supply device of the intermediate frequency furnace, converting the direct current into intermediate frequency current, generating high-density magnetic lines through an induction coil, cutting a metal workpiece placed in the coil to enable the interior of metal to generate heat to achieve the heating purpose, heating the round steel section billet, removing oxide skin on the surface of the round steel section billet after heating, and manufacturing the round steel section billet into a valve ball billet by using a punch press;
s4, fine processing:
(1) Sending the valve ball blank into a static pressure machine, placing the valve ball blank on a steel bracket, pressurizing and compacting, wherein the pressurizing pressure is 145-155 MPa, the pressing time is 3-4.5 minutes, and releasing pressure after pressing is finished; pressing to obtain a preliminary shape of the valve ball, adjusting the pressing angle of a ball die, and pressing for multiple times;
(2) Carrying out vacuum sintering treatment on the valve ball after press forming, putting the ball mould subjected to press forming into a vacuum furnace, setting the vacuum furnace as a negative pressure value, rapidly heating the temperature in the furnace to 1050 ℃, reducing the heating speed, and finally keeping the temperature at 1500 +/-20 ℃ for 120 minutes;
(3) Putting the valve ball into a closed heat treatment furnace for annealing treatment, vacuumizing the heat treatment furnace, then introducing inert gas for heating annealing, and continuously introducing the inert gas, wherein the inert gas has scouring pressure of 8-10 kg on each square centimeter of the surface of the round steel section billet;
(4) Grinding the valve ball, and finish-machining the eccentric arc groove by using a forming cutter according to the specification of a ball body to be ground, wherein the machining precision is +/-3 microns, and the size of the ball body is ensured to be consistent with that of the grinding groove; the ball grinding process comprises coarse grinding, fine grinding, coarse grinding, fine grinding and polishing;
s5, spraying a wear-resistant layer: and (4) placing the ball valve after the fine processing on spraying equipment, and spraying the wear-resistant layer on the surface of the ball valve to form a product.
2. The method for machining the valve ball according to claim 1, wherein the method comprises the following steps: the weight percentage of the raw materials is WC:40%, ni:8%, zr:2%, pr:0.5%, fe:7%, cu:7%, si:5.5% and the balance TiC.
3. The method for machining the valve ball according to claim 1, wherein the method comprises the following steps: the weight percentage of the raw materials is WC:35%, ni:6%, zr:1%, pr:0.2%, fe:5%, cu:5%, si:5% and the balance TiC.
4. The method for machining the valve ball according to claim 1, wherein the method comprises the following steps: the weight percentage of the raw materials is WC:45%, ni:10%, zr:3% and Pr:0.7%, fe:9%, cu:9%, si:6% and the balance TiC.
5. The method for machining the valve ball according to claim 1, wherein the method comprises the following steps: wherein a decorticator is adopted when removing the oxide skin on the surface of the heated round steel section billet.
6. The machining method of the valve ball according to claim 1, wherein: the wear-resistant layer is formed by mixing 20-30% of acrylic resin, 30-40% of epoxy resin, 10-15% of silicon carbide, 5-15% of tungsten carbide, 5-10% of manganese carbide and 10-15% of inorganic filler.
7. The method for machining the valve ball according to claim 1, wherein the method comprises the following steps: in the step S4, in the fine processing, after the fine grinding is finished, a digital display micrometer is adopted for measuring, at least 20 points are taken on the spherical surface, and the sphericity measurement precision can be controlled within the range of 2 micrometers; after polishing, measuring by using a high-precision roundness measuring instrument; each batch of hard alloy spheres to be detected are cleaned by wiping with cotton yarn dipped with alcohol, and are placed for 3 hours in a constant room temperature environment, and the spheres are measured after the temperature of the spheres is consistent with the temperature of the measurement environment; the sphere to be measured is sequentially aligned with three cross sections which are mutually vertical in space, when the roundness value of each cross section is less than 1 mu m, the sphericity of the sphere is qualified, and the sphericity value is the average value of 3 measurement results.
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| US6911063B2 (en) * | 2003-01-13 | 2005-06-28 | Genius Metal, Inc. | Compositions and fabrication methods for hardmetals |
| CN101545546B (en) * | 2008-03-28 | 2010-10-06 | 辽宁华运控制设备制造有限公司 | Production method of tungsten-carbide cermet composite-material wear-resistant ball valve |
| CN101545545B (en) * | 2008-03-28 | 2010-08-25 | 辽宁华运控制设备制造有限公司 | Titanium-nitride cermet composite-material wear-resistant ball valve |
| CN102374303A (en) * | 2010-08-16 | 2012-03-14 | 成都乘风阀门有限责任公司 | High-temperature and high-pressure hard sealing ball valve |
| CN103264137A (en) * | 2012-08-17 | 2013-08-28 | 大连大高阀门股份有限公司 | Flange ball valve body forging technology |
| RU2525965C2 (en) * | 2012-09-07 | 2014-08-20 | Общество С Ограниченной Ответственностью "Марома Технологии" | Cermet ball valve and method of its fabrication |
| CN204459259U (en) * | 2015-01-30 | 2015-07-08 | 浙江瑞莱士机械有限公司 | Based on the spheroid of laser melting and coating process |
| CN105880605B (en) * | 2016-05-16 | 2017-12-29 | 四川欧曼机械有限公司 | A kind of big specification hard alloy valve ball production technologies of φ more than 80 |
| CN108373749A (en) * | 2016-11-17 | 2018-08-07 | 天津博锐格涂层技术有限公司 | rotor wear-resistant coating |
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Effective date of registration: 20230518 Address after: Room 101, Building 2, Zone 8, Wanyang Zhongchuang City, Bihu Town, Liandu District, Lishui City, Zhejiang Province, 323000 Patentee after: Zhejiang Duoma Valve Technology Co.,Ltd. Address before: 325100 Heyi Industrial Zone, Oubei street, Yongjia County, Wenzhou City, Zhejiang Province (in Yongjia Shixin Technology Co., Ltd.) Patentee before: WENZHOU JIALILI VALVE MANUFACTURING Co.,Ltd. |