CN112981301A - Preparation method of threaded element for double-screw extruder - Google Patents
Preparation method of threaded element for double-screw extruder Download PDFInfo
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- CN112981301A CN112981301A CN202110177796.8A CN202110177796A CN112981301A CN 112981301 A CN112981301 A CN 112981301A CN 202110177796 A CN202110177796 A CN 202110177796A CN 112981301 A CN112981301 A CN 112981301A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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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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- 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
- C22C29/08—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 based on tungsten carbide
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
Abstract
The invention discloses a preparation method of a thread element for a double-screw extruder, which comprises the following steps: the method comprises the following steps: preparing a threaded element base body, firstly carrying out tempering heat treatment on the threaded element base body, and then carrying out rounding treatment on a 90-degree corner between two end faces of the threaded element base body, wherein the radius of rounding is 0.1-0.2 mm; step two: and D, carrying out sand blasting and coarsening on the surface of the threaded element matrix subjected to the rounding treatment in the step one, then directly spraying tungsten-nickel-based alloy powder onto the surface of the threaded element matrix through a spray gun by adopting a supersonic speed flame spraying method to obtain a tungsten-nickel-based composite coating, repeatedly spraying the tungsten-nickel-based alloy powder onto the surface of the threaded element matrix by the spray gun to enable the tungsten-nickel-based composite coating to be stacked layer by layer, wherein the thickness of each tungsten-nickel-based composite coating is 50-100 mu m, and the total thickness of the stacked tungsten-nickel-based composite coatings is 0.8-1.0 mm. The invention improves the surface hardness, the wear resistance and the corrosion resistance, and further improves the production efficiency of the double-screw extruder for modified plastics, particularly glass fiber and carbon fiber modified plastics.
Description
Technical Field
The invention relates to a preparation method of a thread element for a double-screw extruder.
Background
The screw extruder is a mechanical production device widely applied to industries such as plastic, food and feed processing, and the like, and the working principle of the screw extruder is that pressure and shearing force are generated through rotation of a screw, so that materials are subjected to physical or chemical changes after the actions of mixing, extruding, shearing and the like, and finally, a finished product is extruded at the terminal of the device.
With the rapid development of polymer industry, various novel filling, reinforcing, modifying and functional polymer materials are emerging continuously, and are widely applied to various high-strength reinforced plastics. In order to reduce the manufacturing cost of plastic products and to improve certain properties thereof, various reinforcing fillers, such as talc and calcium carbonate, are generally added to the plastic products. Due to the addition of the auxiliary agent, various corrosive media (such as chloride, bromine, sulfide and the like) can be generated under the action of various physical and chemical properties in the extrusion production process. The introduction of these additives during the plastic processing process can cause corrosion or wear of the screw, or both.
In the production process, the screw of the extruder is in a severe high-pressure high-temperature environment and bears huge friction force and shearing force, and the abrasion condition of the surface of the screw is serious. The abrasion of the screw increases the distance between the screw and the machine barrel, and the compression and shearing of the screw to the material are influenced, so that the product quality is reduced. On the other hand, frequent replacement of the worn and failed screw not only increases the cost, but also delays the production plan, and reduces the production efficiency, so that the wear of the screw is reduced, the working life of the screw is prolonged, the maintenance cost of the equipment is greatly reduced, the quality of the product is ensured, and higher economic benefit is brought to enterprises. Many researches for improving the wear resistance of mechanical parts at home and abroad exist, but the working environment of the screw of the extruder is special, the friction is not common between metal and metal, but between metal and high polymer, and soft abrasive materials such as crop products and the like, and the friction and the wear are often accompanied with the corrosion of various corrosive media under higher temperature and contact stress, the friction and the wear mechanism of the type are very complex, and the industry urgently needs to develop a special protection measure for enhancing the surface of the screw.
At present, the conventional heat treatment has little significance for improving the service performance of the screw material, the whole heat treatment technology cannot fully utilize the material, and various defects exist. For example, hot-dip coating, the range of the selection of materials by carburizing is narrow, and the wear resistance of the prepared coating is not enough; the cost for integrally manufacturing the threaded element by using the high-strength alloy material is high, and the threaded element with excellent performance and suitable for producing glass fiber or carbon fiber modified plastics cannot be produced at home.
High Velocity Oxygen (HVOF) is a high temperature, high velocity combustion flame stream generated by combustion of a hydrocarbon fuel gas such as propane or propylene, or hydrogen and high pressure oxygen in a combustion chamber or in a special nozzle. The supersonic flame spraying has moderate heat input, high spraying speed, difficult crystallization of the coating and compact structure, and is the preferred technology for preparing the surface coating of the thread element. At present, the application of the supersonic spraying tungsten-nickel-based composite coating in the field of modified plastic production is not reported yet at home, and therefore the invention provides a novel double-screw extruder threaded element for modified plastic production and a preparation method thereof.
Disclosure of Invention
The present invention is directed to solving the above problems, and provides a method for manufacturing a screw element for a twin-screw extruder, which can meet the structural strength requirement of the screw element, and simultaneously improve the surface hardness, wear resistance and corrosion resistance of the screw element, thereby improving the production efficiency of the twin-screw extruder for modified plastics, particularly glass fiber and carbon fiber modified plastics.
The purpose of the invention is realized as follows:
the invention relates to a preparation method of a thread element for a double-screw extruder, which comprises the following steps:
the method comprises the following steps: preparing a threaded element base body, wherein the threaded element base body is made of high-speed steel, tempering heat treatment is carried out on the threaded element base body, and then rounding treatment is carried out on a 90-degree corner between two end faces of the threaded element base body, and the rounding radius is 0.1-0.2 mm;
step two: carrying out sand blasting and coarsening on the surface of the threaded element matrix subjected to the rounding treatment in the step one, then directly spraying tungsten-nickel-based alloy powder onto the surface of the threaded element matrix through a spray gun by adopting a supersonic speed flame spraying method to obtain a tungsten-nickel-based composite coating, and then repeatedly spraying the tungsten-nickel-based composite coating above the surface of the threaded element matrix back and forth by the spray gun to stack the tungsten-nickel-based composite coating layer by layer, wherein the thickness of each tungsten-nickel-based composite coating layer is 50-100 mu m, and the total thickness of the stacked tungsten-nickel-based composite coating layers is 0.8-1.0 mm; when the supersonic flame spraying is carried out, the flame flow speed of the supersonic flame spraying is more than 2000m/s, the speed of the sprayed particles is 400-275 m/s, the temperature of the outer surface of the container is less than 100 ℃, the oxygen flow is 200-250L/min, the powder feeding rate is 25-35g/min, and the distance between the spray gun and the surface of the threaded element substrate is 200-275 mm.
In the above method for preparing the screw thread element for the twin-screw extruder, the particle size of the tungsten-nickel based alloy powder sprayed on the surface of the screw thread element substrate in the second step is in the range of 100-150 μm.
According to the preparation method of the threaded element for the double-screw extruder, the porosity of the stacked tungsten-nickel-based alloy composite coating is less than 5%, the Vickers hardness of the coating is more than 1000HV, and the bonding force between the coating and the substrate is more than 30 MPa.
The preparation method of the threaded element for the double-screw extruder comprises the step two, wherein the tungsten-nickel-based alloy powder sprayed on the surface of the threaded element substrate in the step two is composed of tungsten carbide and nickel, and the mass percentage ratio of the tungsten carbide to the nickel is 40% -50% to 50% -60%.
The invention has the following beneficial effects:
1. the 90-degree edges of the threaded element are subjected to rounding treatment, and the surface stress concentration coefficient and the generation of microcracks can be reduced through the treatment step, so that the adhesive force of the tungsten-nickel-based composite coating sprayed by a supersonic flame spraying method on the surface of the matrix of the threaded element is greatly improved, the binding force of the tungsten-nickel-based composite coating and the matrix is more than 30MPa, the hardness, the wear resistance and the corrosion resistance of the surface of the matrix are greatly improved, and the service life is longer;
2. the interface layer of the tungsten-nickel-based composite coating is composed of fine tungsten carbide phase particles, the tungsten-nickel-based composite coating and a threaded element matrix are metallurgically bonded and have a mutual permeation phenomenon, and the tungsten-nickel-based composite coating only contains less oxide impurities and air holes and can effectively resist local fatigue fracture and expansion under the action of cyclic stress. And the tungsten-nickel based composite coating is compact in interior, less in defects and residual stress and better in toughness.
Detailed Description
The present invention will be further described with reference to example 1 and comparative examples 1 to 6.
Example 1
The preparation of the threaded element for a twin-screw extruder was carried out as follows:
the method comprises the following steps: preparing a threaded element base body, wherein the threaded element base body is made of high-speed steel, tempering heat treatment is carried out on the threaded element base body, and then rounding treatment is carried out on a 90-degree corner between two end faces of the threaded element base body, and the rounding radius is 0.1-0.2 mm;
step two: carrying out sand blasting and coarsening on the surface of the threaded element matrix subjected to the rounding treatment in the step one, then directly spraying tungsten-nickel-based alloy powder onto the surface of the threaded element matrix through a spray gun by adopting a supersonic speed flame spraying method to obtain a tungsten-nickel-based composite coating, and then repeatedly spraying the tungsten-nickel-based composite coating above the surface of the threaded element matrix back and forth by the spray gun to stack the tungsten-nickel-based composite coating layer by layer, wherein the thickness of each tungsten-nickel-based composite coating layer is 50-100 mu m, and the total thickness of the stacked tungsten-nickel-based composite coating layers is 0.8-1.0 mm; when the supersonic flame spraying is carried out, the flame flow speed of the supersonic flame spraying is more than 2000m/s, the speed of the sprayed particles is 400-275 m/s, the temperature of the outer surface of the container is less than 100 ℃, the oxygen flow is 200-250L/min, the powder feeding rate is 25-35g/min, and the distance between the spray gun and the surface of the threaded element substrate is 200-275 mm.
The particle size range of the tungsten-nickel-based alloy powder sprayed on the surface of the threaded element substrate in the second step is 100-150 mu m.
And in the second step, the tungsten-nickel-based alloy powder sprayed on the surface of the threaded element substrate consists of tungsten carbide and nickel, and the mass percentage content ratio of the tungsten carbide to the nickel is 40% -50% to 50% -60%.
The porosity of the accumulated tungsten-nickel base alloy composite coating is 4%, the Vickers hardness of the coating is 1086HV, and the bonding force between the coating and the substrate is 36 MPa.
The material of the thread element base body is high-speed steel with the trade mark W6Mo5Cr4V 2.
The ultimate capacity of the twin-screw extruder-fiberized PC modified plastic using the thread elements obtained in example 1 was 160 tons.
Comparative example 1:
the preparation of a threaded element for a twin-screw extruder is carried out in the following steps
The method comprises the following steps: preparing a threaded element base body, wherein the threaded element base body is made of high-speed steel, and firstly carrying out tempering heat treatment on the threaded element base body to obtain a threaded element;
the material of the thread element base body is high-speed steel with the trade mark W6Mo5Cr4V 2.
The ultimate capacity of the twin-screw extruder-fiberized PC modified plastic using the screw elements obtained in comparative example 1 was 78 tons.
Comparative example 2:
the preparation of the threaded element for a twin-screw extruder was carried out as follows:
the method comprises the following steps: preparing a threaded element base body, wherein the threaded element base body is made of high-speed steel, and firstly carrying out tempering heat treatment on the threaded element base body;
step two: carrying out sand blasting and coarsening on the surface of the threaded element matrix subjected to tempering heat treatment in the step one, then directly spraying tungsten-nickel-based alloy powder onto the surface of the threaded element matrix through a spray gun by adopting a supersonic speed flame spraying method to obtain a tungsten-nickel-based composite coating, and then repeatedly spraying the tungsten-nickel-based alloy powder onto the surface of the threaded element matrix by the spray gun back and forth to stack the tungsten-nickel-based composite coatings layer by layer, wherein the thickness of each tungsten-nickel-based composite coating is 50-100 mu m, and the total thickness of the stacked tungsten-nickel-based composite coatings is 0.8-1.0 mm; when the supersonic flame spraying is carried out, the flame flow speed of the supersonic flame spraying is more than 2000m/s, the speed of the sprayed particles is 400-275 m/s, the temperature of the outer surface of the container is less than 100 ℃, the oxygen flow is 200-250L/min, the powder feeding rate is 25-35g/min, and the distance between the spray gun and the surface of the threaded element substrate is 200-275 mm.
The particle size range of the tungsten-nickel-based alloy powder sprayed on the surface of the threaded element substrate in the second step is 100-150 mu m.
And in the second step, the tungsten-nickel-based alloy powder sprayed on the surface of the threaded element substrate consists of tungsten carbide and nickel, and the mass percentage content ratio of the tungsten carbide to the nickel is 40% -50% to 50% -60%.
The porosity of the accumulated tungsten-nickel base alloy composite coating is 4.5%, the Vickers hardness of the coating is 1030HV, and the bonding force between the coating and the substrate is 32 MPa.
The material of the thread element base body is high-speed steel with the trade mark W6Mo5Cr4V 2.
The ultimate capacity of the twin-screw extruder-fiberized PC modified plastic using the screw elements obtained in comparative example 2 was 121 tons.
Comparative example 3:
the preparation of the threaded element for a twin-screw extruder was carried out as follows:
the method comprises the following steps: preparing a threaded element base body, wherein the threaded element base body is made of high-speed steel, tempering heat treatment is carried out on the threaded element base body, and then rounding treatment is carried out on a 90-degree corner between two end faces of the threaded element base body, and the rounding radius is 0.1-0.2 mm;
step two: and D, performing sand blasting and coarsening on the surface of the threaded element matrix subjected to the rounding treatment in the step one.
The material of the thread element base body is high-speed steel with the trade mark W6Mo5Cr4V 2.
The ultimate capacity of the twin-screw extruder-fiberized PC modified plastic using the screw elements obtained in comparative example 3 was 73 tons.
Comparative example 4
The preparation of the threaded element for a twin-screw extruder was carried out as follows:
the method comprises the following steps: preparing a threaded element base body, wherein the threaded element base body is made of high-speed steel, tempering heat treatment is carried out on the threaded element base body, and then rounding treatment is carried out on a 90-degree corner between two end faces of the threaded element base body, and the rounding radius is 0.3 mm;
step two: carrying out sand blasting and coarsening on the surface of the threaded element matrix subjected to the rounding treatment in the step one, then directly spraying tungsten-nickel-based alloy powder onto the surface of the threaded element matrix through a spray gun by adopting a supersonic speed flame spraying method to obtain a tungsten-nickel-based composite coating, and then repeatedly spraying the tungsten-nickel-based composite coating above the surface of the threaded element matrix back and forth by the spray gun to stack the tungsten-nickel-based composite coating layer by layer, wherein the thickness of each tungsten-nickel-based composite coating layer is 50-100 mu m, and the total thickness of the stacked tungsten-nickel-based composite coating layers is 0.8-1.0 mm; when the supersonic flame spraying is carried out, the flame flow speed of the supersonic flame spraying is more than 2000m/s, the speed of the sprayed particles is 400-275 m/s, the temperature of the outer surface of the container is less than 100 ℃, the oxygen flow is 200-250L/min, the powder feeding rate is 25-35g/min, and the distance between the spray gun and the surface of the threaded element substrate is 200-275 mm.
The particle size range of the tungsten-nickel-based alloy powder sprayed on the surface of the threaded element substrate in the second step is 100-150 mu m.
And in the second step, the tungsten-nickel-based alloy powder sprayed on the surface of the threaded element substrate consists of tungsten carbide and nickel, and the mass percentage content ratio of the tungsten carbide to the nickel is 40% -50% to 50% -60%.
The porosity of the accumulated tungsten-nickel base alloy composite coating is 4.7%, the Vickers hardness of the coating is 1053HV, and the bonding force between the coating and the substrate is 33 MPa.
The material of the thread element base body is high-speed steel with the trade mark W6Mo5Cr4V 2.
The ultimate capacity of the twin-screw extruder-fiberized PC modified plastic using the screw elements obtained in comparative example 4 was 137 tons.
Comparative example 5:
the preparation of the threaded element for a twin-screw extruder was carried out as follows:
the method comprises the following steps: preparing a threaded element base body, wherein the threaded element base body is made of high-speed steel, tempering heat treatment is carried out on the threaded element base body, and then rounding treatment is carried out on a 90-degree corner between two end faces of the threaded element base body, and the rounding radius is 0.1-0.2 mm;
step two: carrying out sand blasting and coarsening on the surface of the threaded element matrix subjected to the rounding treatment in the step one, then directly spraying tungsten-nickel-based alloy powder onto the surface of the threaded element matrix through a spray gun by adopting a supersonic speed flame spraying method to obtain a tungsten-nickel-based composite coating, and then repeatedly spraying the tungsten-nickel-based composite coating above the surface of the threaded element matrix back and forth by the spray gun to stack the tungsten-nickel-based composite coating layer by layer, wherein the thickness of each tungsten-nickel-based composite coating layer is 50-100 mu m, and the total thickness of the stacked tungsten-nickel-based composite coating layers is 0.8-1.0 mm; when the supersonic flame spraying is carried out, the flame flow speed of the supersonic flame spraying is more than 2000m/s, the speed of the sprayed particles is 400-.
The particle size range of the tungsten-nickel-based alloy powder sprayed on the surface of the threaded element substrate in the second step is 100-150 mu m.
And in the second step, the tungsten-nickel-based alloy powder sprayed on the surface of the threaded element substrate consists of tungsten carbide and nickel, and the mass percentage content ratio of the tungsten carbide to the nickel is 40% -50% to 50% -60%.
The porosity of the stacked tungsten-nickel base alloy composite coating is 6.8%, the Vickers hardness of the coating is 925HV, and the bonding force between the coating and the substrate is 30 MPa.
The material of the thread element base body is high-speed steel with the trade mark W6Mo5Cr4V 2.
The ultimate capacity of the twin-screw extruder-fiberized PC modified plastic using the screw elements obtained in comparative example 5 was 119 tons.
Comparative example 6:
the preparation of the threaded element for a twin-screw extruder was carried out as follows:
the method comprises the following steps: preparing a threaded element base body, wherein the threaded element base body is made of high-speed steel, tempering heat treatment is carried out on the threaded element base body, and then rounding treatment is carried out on a 90-degree corner between two end faces of the threaded element base body, and the rounding radius is 0.1-0.2 mm;
step two: carrying out sand blasting and coarsening on the surface of the threaded element matrix subjected to the rounding treatment in the step one, then directly spraying tungsten-nickel-based alloy powder onto the surface of the threaded element matrix through a spray gun by adopting a supersonic speed flame spraying method to obtain a tungsten-nickel-based composite coating, and then repeatedly spraying the tungsten-nickel-based composite coating above the surface of the threaded element matrix back and forth by the spray gun to stack the tungsten-nickel-based composite coating layer by layer, wherein the thickness of each tungsten-nickel-based composite coating layer is 50-100 mu m, and the total thickness of the stacked tungsten-nickel-based composite coating layers is 0.8-1.0 mm; when the supersonic flame spraying is carried out, the flame flow speed of the supersonic flame spraying is more than 2000m/s, the speed of the sprayed particles is 400-275 m/s, the temperature of the outer surface of the container is less than 100 ℃, the oxygen flow is 200-250L/min, the powder feeding rate is 25-35g/min, and the distance between the spray gun and the surface of the threaded element substrate is 200-275 mm.
And in the second step, the particle size of the tungsten-nickel-based alloy powder sprayed on the surface of the matrix of the threaded element is more than 150 microns.
And in the second step, the tungsten-nickel-based alloy powder sprayed on the surface of the threaded element substrate consists of tungsten carbide and nickel, and the mass percentage content ratio of the tungsten carbide to the nickel is 40% -50% to 50% -60%.
The porosity of the stacked tungsten-nickel base alloy composite coating is 5.9%, the Vickers hardness of the coating is 994HV, and the bonding force between the coating and the substrate is 31 MPa.
The material of the thread element base body is high-speed steel with the trade mark W6Mo5Cr4V 2.
The ultimate capacity of the twin-screw extruder-fiberized PC modified plastic using the screw elements obtained in comparative example 6 was 116 tons.
As can be seen from the embodiment 1 and the comparative examples 1 to 6, the threaded element obtained by surface treatment by using the method has the advantages that the sharp edges and corners on the surface are subjected to rounding treatment, and the rounding radius is limited, so that the bonding strength of the tungsten-nickel-based composite coating is greatly improved, and the service life of the threaded element is greatly prolonged; comparing example 1 with comparative examples 1-6 separately, it can be seen that the supersonic flame spraying method for spraying the tungsten-nickel based composite coating, rounding, limiting rounding radius, limiting powder feeding rate and spraying distance, and limiting particle size of the tungsten-nickel based alloy powder greatly improves the ultimate production capacity of the double screw extruder for adding fiber PC modified plastic; meanwhile, by combining the comparative example 1, the comparative example 2 and the comparative example 3, it can be found that the improvement of the limit production capacity of the double-screw extruder fiber-added PC modified plastic is not obvious enough by using the rounding treatment alone, but the limit production capacity of the double-screw extruder fiber-added PC modified plastic is improved to a certain extent by using the supersonic flame spraying method to spray the tungsten-nickel-based composite coating alone, and the rounding treatment can play a greater role only by using the rounding treatment on the basis of using the supersonic flame spraying method, so that the limit production capacity of the double-screw extruder fiber-added PC modified plastic is greatly improved; the technical scheme of the invention is shown to play an important role in improving the ultimate production capacity of the twin-screw extruder fiber-added PC modified plastic by combining with comparative example 1, comparative example 4, comparative example 5 and comparative example 6, wherein the limitation on the rounding radius, the powder feeding rate, the spraying distance and the particle size range of the tungsten-nickel-based alloy powder plays an important role, and the comparative examples 4-6 respectively cause the ultimate production capacity of the twin-screw extruder fiber-added PC modified plastic to be obviously reduced compared with that of example 1 due to the change of the rounding radius, the change of the powder feeding rate and the spraying distance and the change of the particle size of the tungsten-nickel-based alloy powder.
The invention adopts the supersonic flame spraying method and sets the parameters, so that the speed of the tungsten-nickel-based alloy powder impacting the surface of the matrix of the threaded element is greatly improved, the compactness and the bonding strength are further ensured, the porosity of the tungsten-nickel-based composite coating is less than 5%, the Vickers hardness is more than 1000HV, and the bonding force between the tungsten-nickel-based composite coating and the matrix of the threaded element is more than 30 MPa; and the production capacity of the thread element in a glass fiber and carbon fiber modified PC plastic double-screw extruder is more than 2 times of that of a common thread element by applying a rounding treatment process on the basis of adopting a supersonic flame spraying method.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (4)
1. A method for preparing a threaded element for a twin-screw extruder, characterized in that it comprises:
the method comprises the following steps: preparing a threaded element base body, wherein the threaded element base body is made of high-speed steel, tempering heat treatment is carried out on the threaded element base body, and then rounding treatment is carried out on a 90-degree corner angle between two end faces of the threaded element base body, and the rounding radius is 0.1-0.2 mm;
step two: carrying out sand blasting and coarsening on the surface of the threaded element matrix subjected to the rounding treatment in the step one, then directly spraying tungsten-nickel-based alloy powder onto the surface of the threaded element matrix through a spray gun by adopting a supersonic speed flame spraying method to obtain a tungsten-nickel-based composite coating, and then repeatedly spraying the tungsten-nickel-based composite coating above the surface of the threaded element matrix back and forth by the spray gun to stack the tungsten-nickel-based composite coating layer by layer, wherein the thickness of each tungsten-nickel-based composite coating layer is 50-100 mu m, and the total thickness of the stacked tungsten-nickel-based composite coating layers is 0.8-1.0 mm; when the supersonic flame spraying is carried out, the flame flow speed of the supersonic flame spraying is more than 2000m/s, the speed of the sprayed particles is 400-275 m/s, the temperature of the outer surface of the container is less than 100 ℃, the oxygen flow is 200-250L/min, the powder feeding rate is 25-35g/min, and the distance between the spray gun and the surface of the threaded element substrate is 200-275 mm.
2. The method for producing a threaded element for a twin-screw extruder as claimed in claim 1, wherein the particle size of the tungsten-nickel based alloy powder sprayed onto the surface of the threaded element substrate in the second step is in the range of 100-150 μm.
3. A method of producing a threaded element for a twin-screw extruder as claimed in claim 1, characterized in that the porosity of the deposited tungsten-nickel based alloy composite coating is less than 5%, the vickers hardness of the coating is greater than 1000HV, and the bonding force of the coating to the substrate is greater than 30 MPa.
4. The method for producing a threaded element for a twin-screw extruder according to claim 1, wherein the tungsten-nickel-based alloy powder sprayed onto the surface of the threaded element substrate in the second step is composed of tungsten carbide and nickel at a ratio of 40% to 50% by mass to 50% to 60% by mass.
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