CN110961636B - Sintered metal filter element for spinning assembly and preparation method thereof - Google Patents
Sintered metal filter element for spinning assembly and preparation method thereof Download PDFInfo
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- CN110961636B CN110961636B CN201911339000.3A CN201911339000A CN110961636B CN 110961636 B CN110961636 B CN 110961636B CN 201911339000 A CN201911339000 A CN 201911339000A CN 110961636 B CN110961636 B CN 110961636B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/1121—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
- D01D1/10—Filtering or de-aerating the spinning solution or melt
Abstract
The sintered metal filter core for the spinning assembly comprises alloy powder, a binder and a pore-forming agent, wherein the alloy powder can be uniformly adhered to the pore-forming agent through the binder, the pore-forming agent volatilizes in the sintering process, the pore size of the sintered metal filter core is adjusted to be 50-100 mu m according to the particle size of the pore-forming agent, so that the filtering precision of the sintered metal filter core reaches 50-100 mu m, the alloy powder comprises a magnesium element, a tungsten element and an aluminum element, the price of the three alloy powders is low, the cost of the prepared sintered metal filter core is greatly reduced, the filtering precision is greatly improved when the sintered metal filter core is applied to the spinning assembly, more fine impurities and gel particles can be filtered, even the sintered metal filter core has the function of shearing the gel particles, the spinning melt is more pure, and broken filaments caused by the weak points of the filaments due to the impurities are reduced, the production is more stable.
Description
Technical Field
The invention relates to the field of porous material preparation, in particular to a sintered metal filter element for a spinning assembly and a preparation method thereof.
Background
The sintered metal filter element is made of metal powder serving as a raw material through cold rolling and forming and high-temperature vacuum sintering, micron-sized precise filtration can be realized through the sintered metal filter element, solid particle impurities in liquid and gas can be separated, when fluid passes through a filter element with certain precision, the impurities are blocked on the surface of the filter element to form a filter cake, and pure fluid flows out through the filter element, so that the fluid polluted or containing the impurities is cleaned to a state required by normal production, and a downstream device is ensured to obtain a pure product or protect the normal work of equipment.
Different from a non-metal sintered filter element, when the filter cake on the surface of the sintered metal filter element reaches a certain thickness, the filter element can be cleaned by a backwashing or back flushing or ultrasonic method through a certain reverse pressure due to the performance characteristic of high strength, so that the filter element can be reused.
The polyester fiber is the fiber with the fastest development, the highest yield and the largest consumption in various synthetic fibers, and is the first large variety of the current synthetic fibers. It has excellent performance and low cost, and has great use in national defense, industrial cloth, civil clothing, etc. Particularly in the field of fibers, polyester chips prepared by polycondensation are prepared into polyester fibers through melt spinning, and the fibers have the advantages of high breaking strength and elastic modulus, moderate rebound resilience, light resistance, heat resistance, corrosion resistance and the like, so that the rapid development is realized since the appearance of the polyester fibers.
In the production process of polyester filament spinning, a spinning assembly is a relatively critical part, a filter medium of the polyester filament spinning assembly usually adopts sintered metal sand or sea sand with different meshes as a melt filtering and pressurizing material, for polyester spinning melt, the initial pressure of the assembly is generally required to be designed in a state of 100-120 bar so as to achieve normal spinning, and the service cycle of the assembly can be basically 35-45 days. Because the proportion of the differential fibers is gradually increased in the production process of the chemical fibers, the production of modified polyester or special chemical fibers such as copolyester, cation, polyester-nylon composite and parallel composite shows an explosive growth trend, but impurities and gel particles are increased due to the modification of the polymer melts, or the filtration flow of the melts in unit area is increased greatly due to the structural limitation of the composite spinning assembly, so that the service cycle of the spinning assembly is very short, for example, the service cycle of the cation fiber spinning assembly is about 15 days, the service cycle of the polyester-nylon composite fiber spinning assembly is about 10-12 days, the service cycle of the parallel composite fiber spinning assembly is 3-12 days, and some melts are spun for only 2 days, thereby greatly influencing the production efficiency, increasing the production consumption and greatly increasing the labor intensity of workers.
In the prior art, the sintered metal filter element is prepared from copper powder, nickel powder, stainless steel powder, titanium powder and other materials, the metal powder is high in production cost, pores of the sintered metal filter element are not easy to control in the sintering process of the filter element prepared by sintering only metal, the quality of the prepared sintered metal filter element is different, and defective products are easy to occur. Some of the materials are not suitable for polyester melt spinning, and some filter elements have lower pressure resistance, so that defective products are easy to appear in the high-pressure forming process; some filter elements contain a large amount of iron, and the quality of the fabric is influenced by the existence of iron ions in the spinning process.
Disclosure of Invention
In order to solve the problems, the invention provides a sintered metal filter element for a spinning assembly and a preparation method thereof, the prepared sintered metal filter element is low in price and stable in quality, and the specific scheme of the invention is as follows:
the invention aims to provide a sintered metal filter element for a spinning assembly, which is prepared from the following raw materials in parts by weight:
50-90 parts of alloy powder
5-10 parts of binder
5-40 parts of pore-forming agent.
In some embodiments of the present invention, the alloy powder includes 30 to 50wt% of magnesium element, 10 to 30wt% of tungsten element, and 30 to 50wt% of aluminum element, based on 100 wt% of the alloy powder.
The invention is further improved in that: the median particle size of the alloy powder is 30-60 mu m.
The invention is further improved in that: the binder is at least one of polylactic acid, poly 3-hydroxybutyric acid, konjac glucomannan, melamine polyphosphate and methacryloxyoctyl trimethoxysilane.
The invention is further improved in that: the particle size of the pore-forming agent is 50-100 mu m.
The invention is further improved in that: the pore-forming agent is at least one of ammonium carbonate, ammonium bicarbonate, carbon powder, coal powder, polyvinyl alcohol and polymethyl methacrylate.
A method of making a sintered metal filter element for a spin pack assembly comprising the steps of:
s1, uniformly mixing a pore-forming agent and alloy powder, and then adding a binder into the uniformly mixed pore-forming agent and alloy powder to make the alloy powder bonded on the surface of the pore-forming agent to obtain a mixed material;
s2, mixing the mixed material obtained in the step S1 at a high speed, carrying out cold press molding to obtain a pressed blank, presintering the pressed blank for 1-3 hours at the temperature of 300-500 ℃, and thoroughly removing the pore-forming agent and the binder;
s3 making the green compact obtained in step S2 at 1X 10-1~1×10-3Sintering in three stages under the vacuum condition of Pa:
the first stage is as follows: the sintering temperature is increased from room temperature to 500-650 ℃, the heating rate is controlled to be 3-5 ℃/min, and the temperature is kept at 500-650 ℃ for 30-60 min;
and a second stage: heating the sintering temperature to 800-900 ℃, controlling the heating rate at 3-5 ℃/min, and keeping the temperature at 800-900 ℃ for 10-20 min;
and a third stage: and (3) heating the sintering temperature to 1100-1300 ℃, controlling the heating rate at 1-2 ℃/min, preserving the heat at 1100-1300 ℃ for 240-360 min, and cooling with a furnace after sintering to obtain the sintered metal filter element.
The invention is further improved in that: the pressure of the cold press molding in the step S2 is 60-120M Pa.
Compared with the prior art, the invention has the beneficial effects that:
1. the alloy powder can be uniformly adhered to the pore-forming agent through the binder, the pore-forming agent and the binder are completely volatilized in the sintering process to obtain the pore diameter of the sintered metal filter element, and the pore diameter of the sintered metal filter element can be adjusted according to the particle diameter of the pore-forming agent.
2. The alloy powder of the magnesium element, the tungsten element and the aluminum element has lower price, and the cost of the prepared sintered metal filter element is greatly reduced.
3. The sintered metal filter element for the spinning assembly is prepared by adopting segmented sintering, the obtained sintered metal filter element alloy is more compact in formation, the thermal deformation is smaller, the strength of the metal filter element formed by magnesium-tungsten-aluminum alloy is higher at high temperature in the sintering process, the filtering of spinning melt is facilitated at high temperature and high pressure, and the sintered metal filter element is used in the spinning assembly and can increase the filtering area of the melt to 2-4 times compared with metal filter sand.
4. The particle size of the pore-forming agent in the formula system of the sintered metal filter element is 50-100 microns, and the pore-forming agent volatilizes along with the rise of temperature in the sintering process, namely the pore size of the sintered metal filter element is generated.
5. The sintered metal filter element has extremely small thermal deformation, and can be reused after vacuum calcination and ultrasonic cleaning after polyester melt spinning at high temperature and high pressure, the repetition frequency can reach 20-25 times, the use cost of the filter element is greatly reduced, and solid waste pollution caused by disposable waste of the original metal sand is reduced.
Detailed Description
The sintered metal filter element for the spinning assembly is prepared from the following raw materials in parts by weight:
50-90 parts of alloy powder
5-10 parts of binder
5-40 parts of pore-forming agent.
In the formula system, the alloy powder can be uniformly adhered to the pore-forming agent through the binder, the pore-forming agent and the binder are completely volatilized in the sintering process to obtain the pore diameter of the sintered metal filter element, and the pore diameter of the sintered metal filter element can be adjusted according to the particle diameter of the pore-forming agent;
the alloy powder comprises, by weight, 100% of magnesium element, 10-30% of tungsten element and 30-50% of aluminum element, wherein the median particle size of the alloy powder is 30-60 mu m; the alloy powder has lower price, and the cost of the sintered metal filter element prepared by the alloy powder is greatly reduced. And the sintered metal filter element prepared by sintering the magnesium element, the tungsten element and the aluminum element has higher strength at high temperature, and is beneficial to filtering spinning melt at high temperature. Compared with metal filter sand, the melt filtering area can be increased to 2-4 times by using the method of sintering the metal filter element.
Wherein the binder is at least one of polylactic acid, poly 3-hydroxybutyric acid, konjac glucomannan, melamine polyphosphate and methacryloxyoctyl trimethoxysilane.
The particle size of the pore-forming agent is 50-100 microns, the pore-forming agent is at least one of ammonium carbonate, ammonium bicarbonate, carbon powder, coal powder, polyvinyl alcohol and polymethyl methacrylate, and the pore-forming agent volatilizes along with the rise of temperature in the sintering process, namely the pore size of the sintered metal filter core is generated.
The preparation method of the sintered metal filter element for the spinning assembly comprises the following steps:
s1, uniformly mixing a pore-forming agent and alloy powder, and then adding a binder into the uniformly mixed pore-forming agent and alloy powder to make the alloy powder bonded on the surface of the pore-forming agent to obtain a mixed material;
s2, mixing the mixed material obtained in the step S1 at a high speed, carrying out cold press molding to obtain a pressed blank, presintering the pressed blank for 1-3 h at the temperature of 300-500 ℃, and thoroughly removing the pore-forming agent and the binder, wherein the pressure of the cold press molding is 60-120M Pa;
s3 making the green compact obtained in step S2 at 1X 10-1~1×10-3Sintering in three stages under the vacuum condition of Pa:
the first stage is as follows: the sintering temperature is increased from room temperature to 500-650 ℃, the heating rate is controlled to be 3-5 ℃/min, and the temperature is kept at 500-650 ℃ for 30-60 min;
and a second stage: heating the sintering temperature to 800-900 ℃, controlling the heating rate at 3-5 ℃/min, and keeping the temperature at 800-900 ℃ for 10-20 min;
and a third stage: and (3) heating the sintering temperature to 1100-1300 ℃, controlling the heating rate at 1-2 ℃/min, preserving the heat at 1100-1300 ℃ for 240-360 min, and cooling with a furnace after sintering to obtain the sintered metal filter element.
By adopting a three-step sintering method, the prepared sintered metal filter element has more uniform pores, better compactness and extremely small thermal deformation.
The sintered metal filter element prepared according to the invention has the filtering precision of 50-100 mu m and can bear certain filtering strength at high temperature.
The technical solutions in the embodiments of the present invention will be clearly and completely described below so that those skilled in the art can better understand the advantages and features of the present invention, and thus the scope of the present invention will be more clearly defined. The embodiments described herein are only a few embodiments of the present invention, rather than all embodiments, and all other embodiments that can be derived by one of ordinary skill in the art without inventive faculty based on the embodiments described herein are intended to fall within the scope of the present invention.
Example 1
The sintered metal filter element for the spinning assembly is prepared from the following raw materials in parts by weight:
50 portions of alloy powder
10 portions of adhesive
40 parts of pore-forming agent.
The alloy powder comprises, by weight, 100% of magnesium element, 10-30% of tungsten element and 40% of aluminum element.
Wherein the median particle diameter of the alloy powder is 45 μm.
Wherein the binder is methacryloxy octyl trimethoxy silane.
Wherein the particle size of the pore-forming agent is 100 μm.
Wherein the pore-forming agent is polymethyl methacrylate.
The preparation method of the sintered metal filter element for the spinning assembly comprises the following steps:
s1, uniformly mixing a pore-forming agent and alloy powder, and then adding a binder into the uniformly mixed pore-forming agent and alloy powder to make the alloy powder bonded on the surface of the pore-forming agent to obtain a mixed material;
s2, mixing the mixed material obtained in the step S1 at a high speed, carrying out cold press molding to obtain a pressed blank, presintering the pressed blank for 3 hours at the temperature of 300 ℃, and completely removing the pore-forming agent and the binder, wherein the pressure of the cold press molding is 100 MPa;
s3 making the green compact obtained in step S2 at 1X 10-3Sintering in three stages under the vacuum condition of Pa:
the first stage is as follows: the sintering temperature is increased from room temperature to 650 ℃, the heating rate is controlled at 5 ℃/min, and the temperature is kept at 650 ℃ for 60 min;
and a second stage: heating the sintering temperature to 900 ℃, controlling the heating rate at 5 ℃/min, and keeping the temperature at 900 ℃ for 20 min;
and a third stage: and (3) heating the sintering temperature to 1300 ℃, controlling the heating rate at 2 ℃/min, preserving the heat at 1300 ℃ for 360min, and cooling the sintered metal filter element along with the furnace after sintering to obtain the sintered metal filter element.
Example 2
The sintered metal filter element for the spinning assembly is prepared from the following raw materials in parts by weight:
90 portions of alloy powder
5 portions of adhesive
5 parts of pore-forming agent.
The alloy powder comprises 50wt% of magnesium element, 20wt% of tungsten element and 30wt% of aluminum element, wherein the weight of the alloy powder is 100%.
Wherein the median particle diameter of the alloy powder is 60 μm.
Wherein the binder is melamine polyphosphate.
Wherein the particle size of the pore-forming agent is 50 μm.
Wherein the pore-forming agent is ammonium carbonate.
The preparation method of the sintered metal filter element for the spinning assembly comprises the following steps:
s1, uniformly mixing a pore-forming agent and alloy powder, and then adding a binder into the uniformly mixed pore-forming agent and alloy powder to make the alloy powder bonded on the surface of the pore-forming agent to obtain a mixed material;
s2, mixing the mixed material obtained in the step S1 at a high speed, carrying out cold press molding to obtain a pressed blank, presintering the pressed blank for 2 hours at the temperature of 400 ℃, and completely removing the pore-forming agent and the binder, wherein the pressure of the cold press molding is 120 MPa;
s3 making the green compact obtained in step S2 at 1X 10-1Sintering in three stages under the vacuum condition of Pa:
the first stage is as follows: the sintering temperature is increased from room temperature to 500 ℃, the heating rate is controlled at 3 ℃/min, and the temperature is kept at 500 ℃ for 60 min;
and a second stage: heating the sintering temperature to 800 ℃, controlling the heating rate at 3 ℃/min, and keeping the temperature at 800 ℃ for 10 min;
and a third stage: and (3) heating the sintering temperature to 1100 ℃, controlling the heating rate at 1 ℃/min, preserving the heat at 1100 ℃ for 360min, and cooling the sintered metal filter element along with the furnace after sintering to obtain the sintered metal filter element.
Example 3
The sintered metal filter element for the spinning assembly is prepared from the following raw materials in parts by weight:
alloy powder 70 parts
8 portions of binder
And 22 parts of pore-forming agent.
The alloy powder comprises 30wt% of magnesium element, 30wt% of tungsten element and 40wt% of aluminum element, wherein the weight of the alloy powder is 100%.
Wherein the median particle diameter of the alloy powder is 30 μm.
Wherein the binder is konjac glucomannan.
Wherein the particle size of the pore-forming agent is 75 μm.
Wherein the pore-forming agent is ammonium bicarbonate.
The preparation method of the sintered metal filter element for the spinning assembly comprises the following steps:
s1, uniformly mixing a pore-forming agent and alloy powder, and then adding a binder into the uniformly mixed pore-forming agent and alloy powder to make the alloy powder bonded on the surface of the pore-forming agent to obtain a mixed material;
s2, mixing the mixed material obtained in the step S1 at a high speed, carrying out cold press molding to obtain a pressed blank, presintering the pressed blank for 1 hour at 500 ℃, and completely removing the pore-forming agent and the binder, wherein the pressure of the cold press molding is 85 MPa;
s3 making the green compact obtained in step S2 at 1X 10-Sintering in three stages under the vacuum condition of Pa:
the first stage is as follows: the sintering temperature is increased from room temperature to 575 ℃, the heating rate is controlled at 4 ℃/min, and the temperature is kept at 575 ℃ for 45 min;
and a second stage: heating the sintering temperature to 850 ℃, controlling the heating rate at 4 ℃/min, and keeping the temperature at 850 ℃ for 15 min;
and a third stage: and (3) heating the sintering temperature to 1200 ℃, controlling the heating rate at 1.5 ℃/min, preserving the heat at 1200 ℃ for 300min, and cooling along with the furnace after sintering to obtain the sintered metal filter element.
Test example 1
The sintered metal filter element prepared in the embodiment 1 of the invention is used for spinning in a spinning assembly and comprises the following steps:
s1 in the melt direct spinning device, setting the spinning melt with the spinning temperature of 290 ℃ and the flow viscosity of 240 Pa.S to pass through a metering pump in a spinning box and a pipeline in the box, entering the spinning component at the flow rate of 41.5g/min, generating the spinning pressure by sintering the spinning melt through a metal filter core, pressing the sintered metal filter core on a filter substrate in a multi-core vertical mode, wherein the diameter of the filter substrate is the diameter of a raw sand cavity, the diameter of the sand cavity in the test example is 50mm, sealing and separating the sand cavity from the inner cavity of the component through an aluminum sealing gasket, extruding the filtered spinning melt through a melt distribution plate and a spinneret plate at certain residual pressure, and realizing normal spinning. Wherein the spinning melt is a cationic copolyester.
S2, setting the pressure of the spinning assembly to be 100bar, pressing the spinning melt led into the spinning assembly in the step S1 into a sintered metal filter element, uniformly flowing out of an inner hole in the middle, passing through a melt distribution plate and a spinneret plate, and ensuring the spinning quality because the pressure of the spinning melt is uniform and no dead angle exists when the spinning melt passes through the spinneret plate.
S3 the spinning melt is filtered by a sintered metal filter component according to S2, the sintered metal filter component is formed by combining a sintered metal filter element and a base plate, a plurality of sintered metal filter elements are uniformly distributed above the base plate, the sintered metal filter component is formed by 15 sintered metal filter elements which are parallel to the flow direction of the spinning melt in the spinning component, then the spinning melt coming out of the inner hole of each sintered metal filter element is distributed to a next-stage melt distribution plate through micropores of the base plate, wherein the precision of each sintered metal filter element is 100 mu m, and the filter area of each sintered metal filter element is 3956mm2The specification of each sintered metal filter element is as follows: Φ 6mm × H18 mm.
The period of the spinning assembly in actual use reaches 35 days, which is 20 days longer than the original assembly filtration mode, and the service period of the assembly is 2.33 times of the original service period.
Test example 2
The sintered metal filter element prepared in the embodiment 2 of the invention is used for spinning in a spinning assembly and comprises the following steps:
s1 in the chip composite spinning device, setting the spinning melt with the spinning temperature of 272 ℃ (component A) and 270 ℃ (component B), the flow viscosity of 220 Pa.S (component A) and the flow viscosity of 200 Pa.S (component A) to pass through a metering pump and a box internal pipeline in a composite spinning box, respectively entering a spinning component at the flow rate of 53g/min, generating the spinning pressure by sintering a metal filter core, pressing the sintered metal filter core on a filter substrate in a multi-core vertical mode, wherein the diameter of the filter substrate is the diameter of a primary sand cavity, the sand cavity used by the two components A and B is 40mm, sealing and separating the sand cavity from the component inner cavity by an aluminum sealing gasket, extruding the filtered spinning melt by a melt distribution plate and a spinneret plate at a certain residual pressure, combining A, B two component melts only when leaving the spinneret plate, And realizing normal silk drawing. Wherein the spinning melt A component is low-viscosity PET, and the B component is PTT polyester.
S2, setting the pressure of the spinning assembly to be 120bar, pressing the spinning melt led into the spinning assembly in the step S1 into a sintered metal filter element, uniformly flowing out of an inner hole in the middle, passing through a melt distribution plate and a spinneret plate, and ensuring the spinning quality because the pressure of the spinning melt is uniform and no dead angle exists when the spinning melt passes through the spinneret plate.
S3, filtering the homogenized spinning melt in the step S2 by a sintered metal filter assembly, wherein the sintered metal filter assembly is formed by combining a sintered metal filter element and a base plate, a plurality of sintered metal filter elements are uniformly distributed above the base plate, the sintered metal filter assembly is formed by arranging 9 sintered metal filter elements in parallel to the flow direction of the spinning melt in the spinning assembly, and then the spinning melt coming out of inner holes of the sintered metal filter elements is distributed into a next-stage melt distribution plate through micropores of the base plate, wherein the precision of the sintered metal filter elements is 50 mu m, and the filter area of the sintered metal filter elements is 2967mm2The specification of each sintered metal filter element is as follows: Φ 5mm × H25 mm.
The period of the spinning assembly in actual use reaches 25 days, which is 15 days longer than the original assembly filtration mode, and the service period of the assembly is 2.5 times of the original service period.
Test example 3
The sintered metal filter element prepared in the embodiment 1 of the invention is used for spinning in a spinning assembly and comprises the following steps:
s1 in the melt direct spinning device, setting the spinning melt with the spinning temperature of 292 ℃ and the flow viscosity of 250 Pa.S to pass through a metering pump in a spinning box and a pipeline in the box, entering the spinning component at the flow rate of 88g/min, generating the spinning pressure by sintering a metal filter element, pressing the sintered metal filter element on a filter substrate in a multi-core vertical mode, wherein the diameter of the filter substrate is the diameter of a raw sand cavity, the diameter of the sand cavity in the test example is 70mm, sealing and separating the sand cavity from the inner cavity of the component through an aluminum sealing gasket, extruding the filtered spinning melt through a melt distributing plate and a spinneret plate at a certain residual pressure, and realizing normal spinning. Wherein the spinning melt is a high shrinkage copolyester.
S2, setting the pressure of the spinning assembly to be 85bar, pressing the spinning melt led into the spinning assembly in the step S1 into a sintered metal filter element, uniformly flowing out of an inner hole in the middle, passing through a melt distribution plate and a spinneret plate, and ensuring the spinning quality because the pressure of the spinning melt is uniform and no dead angle exists when the spinning melt passes through the spinneret plate.
S3, filtering the homogenized spinning melt in the step S2 by a sintered metal filter assembly, wherein the sintered metal filter assembly is formed by combining a sintered metal filter element and a base plate, a plurality of sintered metal filter elements are uniformly distributed above the base plate, the sintered metal filter assembly is formed by arranging 30 sintered metal filter elements in parallel to the flow direction of the spinning melt in the spinning assembly, and then the spinning melt coming out of inner holes of the sintered metal filter elements is distributed into a next-stage melt distribution plate through micropores of the base plate, wherein the precision of the sintered metal filter elements is 75 mu m, and the filter area of the sintered metal filter elements is 9043mm2The specification of each sintered metal filter element is as follows: Φ 8mm × H16 mm.
The period of the spinning assembly in actual use reaches 30 days, which is 15 days longer than the original assembly filtration mode, and the service period of the assembly is 2 times of the original service period.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. A preparation method of a sintered metal filter element for a spinning assembly is characterized by comprising the following steps:
s1, uniformly mixing a pore-forming agent and alloy powder, and then adding a binder into the uniformly mixed pore-forming agent and alloy powder to bond the alloy powder on the surface of the pore-forming agent to obtain a mixed material, wherein the mixed material comprises, by weight, 50-90 parts of the alloy powder, 5-10 parts of the binder and 5-40 parts of the pore-forming agent;
s2, mixing the mixed material obtained in the step S1 at a high speed, carrying out cold press molding to obtain a pressed compact, presintering for 1-3 h at 300-500 ℃, and thoroughly removing the pore-forming agent and the binder;
s3 making the green compact obtained in step S2 at 1X 10-1~1×10-3Sintering in three stages under the vacuum condition of Pa:
the first stage is as follows: the sintering temperature is increased from room temperature to 500-650 ℃, the heating rate is controlled to be 3-5 ℃/min, and the temperature is kept at 500-650 ℃ for 30-60 min;
and a second stage: heating the sintering temperature to 800-900 ℃, controlling the heating rate at 3-5 ℃/min, and keeping the temperature at 800-900 ℃ for 10-20 min;
and a third stage: heating the sintering temperature to 1100-1300 ℃, controlling the heating rate at 1-2 ℃/min, preserving the heat at 1100-1300 ℃ for 240-360 min, and cooling with a furnace after sintering to obtain the sintered metal filter element;
the weight of the alloy powder is 100%, and the alloy powder comprises 30-50 wt% of magnesium element, 10-30 wt% of tungsten element and 30-50 wt% of aluminum element;
the particle size of the pore-forming agent is 50-100 μm.
2. The method of claim 1, wherein the sintered metal filter element comprises: the pressure of the cold press molding in the step S2 is 60-120 MPa.
3. The method of claim 1, wherein the sintered metal filter element comprises: the median particle size of the alloy powder is 30-60 mu m.
4. The method of claim 1, wherein the sintered metal filter element comprises: the binder is at least one of polylactic acid, poly 3-hydroxybutyric acid, konjac glucomannan, melamine polyphosphate and methacryloxyoctyl trimethoxysilane.
5. The method of claim 1, wherein the sintered metal filter element comprises: the pore-forming agent is at least one of ammonium carbonate, ammonium bicarbonate, carbon powder, coal powder, polyvinyl alcohol and polymethyl methacrylate.
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