CN107267885A - A kind of ferrous alloy twin-screw Integral alloy bushing and preparation method thereof - Google Patents
A kind of ferrous alloy twin-screw Integral alloy bushing and preparation method thereof Download PDFInfo
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- CN107267885A CN107267885A CN201710350238.0A CN201710350238A CN107267885A CN 107267885 A CN107267885 A CN 107267885A CN 201710350238 A CN201710350238 A CN 201710350238A CN 107267885 A CN107267885 A CN 107267885A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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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
- B22F3/02—Compacting only
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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
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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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
- C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
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- Materials Engineering (AREA)
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- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of ferrous alloy twin-screw Integral alloy bushing and preparation method thereof, the ferrous alloy twin-screw Integral alloy bushing is by the integral sinter molding of Co-based alloy powder, and by weight percentage, the Co-based alloy powder composition includes：B:1.50‑3.00、C：0.80‑1.60、Cr:6.00‑12.00、Ni:8.00‑16.00、Si:2.00‑3.50、W:0.00 3.00, Fe surpluses.The inventive method is using unique machining process, bushing, the traditional handicraft mode of machine barrel combination are reformed, ferrous alloy bushing hardness after sintering is HRC58 65, anti-wear performance is 47 times of 6542 materials, effectively increase the service life of bushing, production cost is reduced, the active demand that market is improved constantly to product quality is met.
Description
Technical field
The present invention relates to double screw extruder technical field, more particularly to a kind of ferrous alloy twin-screw Integral alloy bushing
And preparation method thereof.
Background technology
Existing screw extruder monolithic lining set, no composite alloy structure, is overall structure bushing, and it mainly makes
Material is rich chromium cast iron, high alum cast iron, W6Mo5Cr4V2 high-speed steel (tool steel), high temperature insostatic pressing (HIP) iron-based powder alloy etc., in knot
On structure, although monolithic lining set solves the problems, such as the stitching portion gaping of joints of c-type/O-shaped separate type composite alloy neck bush, make
Increased with the life-span than c-type/O-shaped separate type composite alloy neck bush set, but due to the specifically used environment of double screw extruder
Covering the fit clearance between screw rod to cylinder lining has more strict technological requirement, i.e., the fit clearance is more than certain numerical value
After (1-1.5mm), the product quality and production efficiency produced to extruder produce considerable influence, generally in monolithic lining set
Bore wear 1-1.5mm after just need carry out replacing neck bush, cause remaining waste of material, not environmentally.
Integrally covered and preparation method thereof as patent CN105463447A discloses a kind of dual alloy, it include matrix sleeve with
Wearing layer, wearing layer is attached to matrix set medial wall of the tube, and matrix sleeve is made up of No. 45 steel or mould steel, and wearing layer is closed by Ni-based
Golden material or tungsten carbide particle reinforcing nickel-bass alloy material is made, and the mass percent of tungsten carbide particle is 10%~35%,
The mass percent of nickel-base alloy is 65%~90%.Because the wear-resistant energy that the dual alloy integrally covers is poor, service life is short, no
It disclosure satisfy that the existing double screw extruder increasingly improved is high-quality, high service life job requirement is, it is necessary to often shut down more
Change, downtime is long, cause use/maintenance cost of double screw extruder higher.
And ferrous alloy material has that hardness is high, anti-corrosion, wear-resisting, heat-resisting feature, existing application it is main with oxyacetylene welding,
Plasma weldering, supersonic speed surfacing or laser are covered based on weldering, due to the high rigidity characteristic of ferrous alloy spray welding layer, it is difficult to cut, make
The application of ferrous alloy is obtained by a definite limitation.In addition, ferrous alloy of the prior art is used high cost by inventor
The associated additives that are made in alloy bushing, macromolecule extruded material of process technology it is easy to wear and corrode the alloy bushing, because
This, the wear-resistant and decay resistance of existing ferrous alloy need further raising.
The content of the invention
Confinement problems of the present invention for solution ferrous alloy material of the prior art when applied to extruder bushing,
By ferrous alloy applied to double screw extruder bushing, proposition one kind is with high abrasion, corrosion-resistant and processing technology is simple, produce
Low ferrous alloy twin-screw Integral alloy bushing of cost and preparation method thereof.
To achieve the above object, the present invention uses following technical scheme：
The first aspect of the invention is to provide a kind of ferrous alloy twin-screw Integral alloy bushing, the double spiral shells of the ferrous alloy
Bar Integral alloy bushing is by the integral sinter molding of iron(-)base powder, by weight percentage, the iron(-)base powder composition
Including：B:1.00-3.50、C：0.50-2.00、Cr:3.00-15.00、Ni:5.00-20.00、Si:1.50-4.00、W:0.00-
5.00th, Fe surpluses.
It is further preferred that in described ferrous alloy twin-screw Integral alloy bushing, it is by weight percentage, described
Iron(-)base powder composition includes：B:1.50-3.00、C：0.80-1.60、Cr:6.00-12.00、Ni:8.00-16.00、Si:
2.00-3.50、W:0.00-3.00, Fe surplus.
Further more preferably, in described ferrous alloy twin-screw Integral alloy bushing, by weight percentage,
The iron(-)base powder composition includes：B:2.00-2.50、C：1.00-1.40、Cr:9.00-10.00、Ni:10.00-
12.00、Si:2.50-3.00、W:0.00-1.50, Fe surplus.
Further it is further preferable that in described ferrous alloy twin-screw Integral alloy bushing, by weight percentage,
The iron(-)base powder composition includes：B:2.20、C：1.20、Cr:9.50、Ni:11.30、Si:2.85、W:0.70th, more than Fe
Amount.
Further, in described ferrous alloy twin-screw Integral alloy bushing, the purity of the base alloy powder is equal
More than 99.9%.
Further, in described ferrous alloy twin-screw Integral alloy bushing, the granularity of the iron(-)base powder
For 200-400 mesh.
Further, in described ferrous alloy twin-screw Integral alloy bushing, the ferrous alloy twin-screw is overall
The foreign steamer Guo of alloy bushing is ellipse, and Internal periphery is " 8 " font structure.
The second aspect of the invention is to provide a kind of preparation side of described ferrous alloy twin-screw Integral alloy bushing
Method, specifically includes following steps：
(1) die surface after the drying is brushed one layer of high-temperature mold lubricant and dried；
(2) iron-based is added up into powder packing to simultaneously ram-jolt in mold cavity；
(3) mould of powder is added up to send into vacuum sintering furnace the above-mentioned iron-based that fills, with 5-15 DEG C/min speed
1000-1600 DEG C is warming up to, 30-250min is incubated；
(4) after insulation terminates, workpiece is cooled to after room temperature and come out of the stove, removed sintering mold, produce ferrous alloy twin-screw
Integral alloy bushing.
Further, in the preparation method of described ferrous alloy twin-screw Integral alloy bushing, in the step (1)
The drying temperature of mould is 220-250 DEG C, drying temperature is 30min.
It is further preferred that in the preparation method of described ferrous alloy twin-screw Integral alloy bushing, the step
(1) in the drying temperature of mould be 225-245 DEG C, drying temperature be 30min.
Further more preferably, it is described in the preparation method of described ferrous alloy twin-screw Integral alloy bushing
In step (1) drying temperature of mould be 235-240 DEG C, drying temperature be 30min.
Further, in the preparation method of described ferrous alloy twin-screw Integral alloy bushing, in the step (3)
1100-1400 DEG C is warming up to 7-12 DEG C/min speed, 50-120min is incubated.
It is further preferred that in the preparation method of described ferrous alloy twin-screw Integral alloy bushing, the step
(3) 1150-1300 DEG C is warming up to 8-10 DEG C/min speed in, 80-100min is incubated.
Further more preferably, it is described in the preparation method of described ferrous alloy twin-screw Integral alloy bushing
1240-1250 DEG C is warming up to 8.5 DEG C/min speed in step (3), 90min is incubated.
It is further preferred that in the preparation method of described ferrous alloy twin-screw Integral alloy bushing, the step
(4) density of obtained ferrous alloy twin-screw Integral alloy bushing is 7.00-7.80g/cm in3；Preferably 7.38g/cm3。
Further more preferably, it is described in the preparation method of described ferrous alloy twin-screw Integral alloy bushing
The operating temperature of ferrous alloy twin-screw Integral alloy bushing is up to 500-650 DEG C
The present invention uses above-mentioned technical proposal, compared with prior art, have the following technical effect that：
(1) using ferrous alloy twin-screw Integral alloy bushing made from the inventive method, the ferrous alloy lining after sintering
Set hardness is HRC58-65；Through wear resistance test, the anti-wear performance of the ferrous alloy bushing is 4-7 times of 6542 materials, and
Corrosion resistance is also greatly improved, and meets existing alloy bushing to wear-resisting and decay resistance requirement, significantly
Improve the service life of plastics machine core component-cylinder liner set and screw part, reduce shutdown in use,
Tear machine number of times and time open, greatly reduce equipment use cost and shutdown loss in use；
(2) preparation method of ferrous alloy twin-screw Integral alloy bushing provided by the present invention, using unique processing
Technical process, has reformed bushing, the traditional handicraft mode of machine barrel combination, has substantially increased the machining accuracy of machine barrel critical size,
Bushing, machine barrel combination precision is improved significantly, meet the active demand that market is improved constantly to product quality.
Brief description of the drawings
Fig. 1 is a kind of cross-sectional view of ferrous alloy twin-screw Integral alloy bushing mould of the invention；
Fig. 2 is a kind of cross-sectional structure schematic diagram of ferrous alloy twin-screw Integral alloy bushing mould of the invention；
Fig. 3 is a kind of alloy cladding layer metallographic structure knot of ferrous alloy twin-screw Integral alloy bushing mould of the invention
Composition.
Embodiment
, will using special technique the invention provides a kind of preparation method of ferrous alloy twin-screw Integral alloy bushing
Iron(-)base powder is integral sintered to turn into double screw extruder neck bush, has reformed bushing, the traditional handicraft mode of machine barrel combination,
The machining accuracy of machine barrel critical size is improved, machine barrel is combined precision and is improved significantly.
Present invention also offers one kind using ferrous alloy twin-screw Integral alloy bushing made from the above method, it has
Good elevated temperature strength and excellent wear-resistant, corrosion-resistant, high temperature resistant, heat shock resistance, antioxygenic property；In strong acid, oxidation-go back
The environment such as former complex media, halogen family and compound, strong reducing medium, alkaline medium, the redox mediator containing chlorion
In all have good decay resistance；So as to greatly reduce the various additives such as glass fibers due to being added in macromolecule
Abrasion and corrosion of the modified materials such as dimension, carbon fiber, calcium carbonate, kaolin, red soil, silica to extruder neck bush, subtract
Lack and time of substantial amounts of human and material resources and maintenance down is spent because extruder neck bush is changed, low equipment is used
Cost.Fill up ferrous alloy and apply a upper blank.
The present invention is described in more detail below by specific embodiment, for a better understanding of the present invention,
But following embodiments are not intended to limit the scope of the invention.
The preparation of the ferrous alloy twin-screw Integral alloy bushing of embodiment 1, comprises the following steps：
(1) die shape, inner chamber, bottom plate, interior mould linear cutter will be used as shown in Figure 1-2 by design drawing requirement
In place, dimension control is in 0.05mm, it is ensured that the accuracy of blank allowance after sintering, then by bottom plate and profile tack welding
Connect fixation；
(2) by mold shell and interior mold clean, help and dry in one layer of High temperature release of die surface brushing after drying, so
The mold core after drying is inserted and fixed position by position of positioning hole afterwards；
(3) by iron(-)base powder by weight percentage：B:1.00、C：0.80、Cr:5.00、Ni:9.00、Si:2.00、
Fe surpluses, are loaded into Die and ram-jolt；
(4) the above-mentioned mould for installing fe-based alloy powder is sent into vacuum sintering furnace, according to 5 DEG C/min programming rate,
It is heated to 1200 DEG C or so and is incubated 100min；
(5) workpiece is cooled to after room temperature and come out of the stove by insulation after terminating, and removing sintering mold must sinter blank；
(6) blank sintered is refined to final finished by product size requirement, produces ferrous alloy twin-screw whole
Body alloy bushing.
The preparation of the ferrous alloy twin-screw Integral alloy bushing of embodiment 2, comprises the following steps：
(1) die shape, inner chamber, bottom plate, interior mould linear cutter will be used as shown in Figure 1-2 by design drawing requirement
In place, dimension control is in 0.05mm, it is ensured that the accuracy of blank allowance after sintering, then by bottom plate and profile tack welding
Connect fixation；
(2) by mold shell and interior mold clean, help and dry in one layer of High temperature release of die surface brushing after drying, so
The mold core after drying is inserted and fixed position by position of positioning hole afterwards；
(3) by iron(-)base powder by weight percentage：B:3.50、C：2.00、Cr:15.00、Ni:15.00、Si:
3.00、W:0.10th, Fe surpluses, are loaded into Die and ram-jolt；
(4) the above-mentioned mould for installing fe-based alloy powder is sent into vacuum sintering furnace, according to 15 DEG C/min programming rate,
It is heated to 1400 DEG C or so and is incubated 200min；
(5) workpiece is cooled to after room temperature and come out of the stove by insulation after terminating, and removing sintering mold must sinter blank；
(6) blank sintered is refined to final finished by product size requirement, produces ferrous alloy twin-screw whole
Body alloy bushing.
The preparation of the ferrous alloy twin-screw Integral alloy bushing of embodiment 3, comprises the following steps：
(1) die shape, inner chamber, bottom plate, interior mould linear cutter will be used as shown in Figure 1-2 by design drawing requirement
In place, dimension control is in 0.05mm, it is ensured that the accuracy of blank allowance after sintering, then by bottom plate and profile tack welding
Connect fixation；
(2) by mold shell and interior mold clean, help and dry in one layer of High temperature release of die surface brushing after drying, so
The mold core after drying is inserted and fixed position by position of positioning hole afterwards；
(3) by iron(-)base powder by weight percentage：B:1.50、C：0.80、Cr:6.00、Ni:10.00、Si:3.50、
W:1.00th, Fe surpluses, are loaded into Die and ram-jolt；
(4) the above-mentioned mould for installing fe-based alloy powder is sent into vacuum sintering furnace, according to 12 DEG C/min programming rate,
It is heated to 950 DEG C or so and is incubated 60min；
(5) workpiece is cooled to after room temperature and come out of the stove by insulation after terminating, and removing sintering mold must sinter blank；
(6) blank sintered is refined to final finished by product size requirement, produces ferrous alloy twin-screw whole
Body alloy bushing.
The preparation of the ferrous alloy twin-screw Integral alloy bushing of embodiment 4, comprises the following steps：
(1) die shape, inner chamber, bottom plate, interior mould linear cutter will be used as shown in Figure 1-2 by design drawing requirement
In place, dimension control is in 0.05mm, it is ensured that the accuracy of blank allowance after sintering, then by bottom plate and profile tack welding
Connect fixation；
(2) by mold shell and interior mold clean, help and dry in one layer of High temperature release of die surface brushing after drying, so
The mold core after drying is inserted and fixed position by position of positioning hole afterwards；
(3) by iron(-)base powder by weight percentage：B:3.00、C：1.60、Cr:12.00、Ni:16.00、Si:
2.50、W:2.50th, Fe surpluses, are loaded into Die and ram-jolt；
(4) the above-mentioned mould for installing fe-based alloy powder is sent into vacuum sintering furnace, according to 12 DEG C/min programming rate,
It is heated to 1050 DEG C or so and is incubated 50min；
(5) workpiece is cooled to after room temperature and come out of the stove by insulation after terminating, and removing sintering mold must sinter blank；
(6) blank sintered is refined to final finished by product size requirement, produces ferrous alloy twin-screw whole
Body alloy bushing.
The preparation of the ferrous alloy twin-screw Integral alloy bushing of embodiment 5, comprises the following steps：
(1) die shape, inner chamber, bottom plate, interior mould linear cutter will be used as shown in Figure 1-2 by design drawing requirement
In place, dimension control is in 0.05mm, it is ensured that the accuracy of blank allowance after sintering, then by bottom plate and profile tack welding
Connect fixation；
(2) by mold shell and interior mold clean, help and dry in one layer of High temperature release of die surface brushing after drying, so
The mold core after drying is inserted and fixed position by position of positioning hole afterwards；
(3) by iron(-)base powder by weight percentage：B:3.50、C：2.00、Cr:3.00、Ni:5.00、Si:1.70、
W:0.80th, Fe surpluses, are loaded into Die and ram-jolt；
(4) the above-mentioned mould for installing fe-based alloy powder is sent into vacuum sintering furnace, according to 5 DEG C/min programming rate,
It is heated to 1200 DEG C or so and is incubated 80min；
(5) workpiece is cooled to after room temperature and come out of the stove by insulation after terminating, and removing sintering mold must sinter blank；
(6) blank sintered is refined to final finished by product size requirement, produces ferrous alloy twin-screw whole
Body alloy bushing.
The preparation of the ferrous alloy twin-screw Integral alloy bushing of embodiment 6, comprises the following steps：
(1) die shape, inner chamber, bottom plate, interior mould linear cutter will be used as shown in Figure 1-2 by design drawing requirement
In place, dimension control is in 0.05mm, it is ensured that the accuracy of blank allowance after sintering, then by bottom plate and profile tack welding
Connect fixation；
(2) by mold shell and interior mold clean, help and dry in one layer of High temperature release of die surface brushing after drying, so
The mold core after drying is inserted and fixed position by position of positioning hole afterwards；
(3) by iron(-)base powder by weight percentage：B:2.20、C：1.20、Cr:9.50、Ni:11.30、Si:2.85、
W:0.70th, Fe surpluses, are loaded into Die and ram-jolt；
(4) the above-mentioned mould for installing fe-based alloy powder is sent into vacuum sintering furnace, according to 10 DEG C/min programming rate,
It is heated to 1300 DEG C or so and is incubated 80min；
(5) workpiece is cooled to after room temperature and come out of the stove by insulation after terminating, and removing sintering mold must sinter blank；
(6) blank sintered is refined to final finished by product size requirement, produces ferrous alloy twin-screw whole
Body alloy bushing.
Rockwell hardness testing：
(1) detection：Using ferrous alloy twin-screw Integral alloy bushing made from 1-6 of the embodiment of the present invention as test specimens；
So that integrally set is comparative example 1 made from patent CN105463447A, using 6542 steel as comparative example 2；(2) testing standard：GB/
T230.1-2009；
(3) hardness measuring method：Φ 30 × 10mm test blocks are being taken made from above-described embodiment and comparative example on bushing,
Rockwell hardness HRC is tested after test block two sides is polished on surface grinding machine；
(4) test result：As shown in following table one；
The hardness test result of each embodiment of table one and comparative example bushing
From the testing result of above-mentioned table one, served as a contrast using ferrous alloy twin-screw Integral alloy made from the inventive method
Ferrous alloy bushing hardness after set, sintering is HRC58-65；And the hardness of bushing is respectively made from comparative example 1, comparative example 2
57HRC、60HRC.Therefore, it is smaller than using the hardness of 1-6 of embodiment of the present invention ferrous alloy twin-screw Integral alloy bushing
Patent CN105463447A integrally covers the hardness with 6542 steel.
Wear test：
(1) detection：Using ferrous alloy twin-screw Integral alloy bushing made from 1-6 of the embodiment of the present invention as test specimens；
Integrally to be covered made from patent CN105463447A for comparative example 1；
(2) testing standard：With reference to standard GB/T/T12444-2006；
(3) test method：Experiment is carried out on ring block abrasion tester, during test, wear test condition：Load is
392N, linear velocity 0.42m/s, 24 DEG C of environment temperature, ambient humidity 50%RH, water lubrication distinguish testing wheel and block after 2 hours
Weightless weight；Sample block size is 7 × 6 × 30；To emery wheel be 6542 high-speed steel (heat treatment state HRC58-62), size Φ 40 ×
Φ16×10。
(4) test result：As shown in following table two；
It is overall using ferrous alloy twin-screw made from the inventive method from the testing result of above-mentioned table one, table two
Ferrous alloy bushing hardness after alloy bushing, sintering is HRC58-65；Through wear resistance test, it is known that the ferrous alloy bushing
Anti-wear performance be 4-7 times of 6542 material, and corrosion resistance is also greatly improved, and meets existing alloy bushing pair
The requirement of wear-resisting and decay resistance, substantially increases the use longevity of plastics machine core component-cylinder liner set and screw part
Life, so that the life-span improves 2-3 times as an example, can reduce by 3 cylinders using alloy bushing of the present invention and change, reduce and using process
In shutdown, tear machine number of times and time open, greatly reduce equipment use cost and shutdown loss in use.
Wear Resistance Mechanism is tested and analyzed：
To ferrous alloy twin-screw Integral alloy bushing of the present invention using X diffractometer combination metallographic microanalysis and observation,
The tissue composition of its cladding layer metallographic, alloy cladding layer metallurgical structure figure (× 800) as shown in Figure 3 are observed, and is analyzed
Think：
(1) white chunks are matrix, are siliceous nickel chromium triangle solid solution phases；The Si elements dissolved in solid solution make nickel distortion of lattice
Increase, solute atoms On Dislocation Motion produces strong inhibition, increases plastic deformation resistance, puies forward the intensity of matrix
Height, thus alloy-based body phase have necessarily have anti-wear performance；
(2) white tiny point-like is hard phase CrB, Comparatively speaking, and machine barrel material is commonly used on the market Cr12MoV, Gao Gezhu
In iron (c-type set) and the metallographic structure of 6542 steel, although also containing various carbide hard phases, but its hard phase is micro-
Hardness only HV1300-1800, thus while its macrohardness is higher, but its wearability is poor；But hard phase CrB and solid solution
Under mutually acting synergistically, although its macrohardness is told somebody what one's real intentions are, but the wearability of the ferrous alloy twin-screw Integral alloy bushing is higher；
(3) the tiny point-like of black is hard phase (Cr, Fe)23C6, hardness about HV1000 (about HRC70), the effect of the phase is
Strengthen matrix, improve hardness, strengthen wearability；
(4) grey bulk is hard phase Ni3B, its main function is to improve the wearability of material at high temperature, the phase hardness
HV10450-553 (about HRC45-53), Stability Analysis of Structures, keeps higher hardness, therefore improve material in high temperature at high temperature
Under anti-wear performance.
Analyzed more than, contain high abrasion in the metallographic structure of ferrous alloy twin-screw Integral alloy bushing of the present invention
Ultrahigh hardness boride phase (CrB), and at high temperature keep wearability nickel borides phase (Ni3B), so as to create iron-based
The high-wear resistance of alloy twin-screw Integral alloy bushing.To sum up, the anti-wear performance of alloy relies primarily on hard phase inside alloy
Wear-resistant effect is played, and detection is all that macrohardness can not reflect the hardness of hard phase, and which forms iron of the present invention
The hardness that based alloy twin-screw Integral alloy bushing is detected is slightly less than patent CN105463447A and integrally covered and 6542 steel
Hardness, but the anti-wear performance of the ferrous alloy bushing is 4-7 times of 6542 material on the contrary.
The specific embodiment of the present invention is described in detail above, but it is intended only as example, and the present invention is not limited
It is formed on particular embodiments described above.To those skilled in the art, it is any to the equivalent modifications that carry out of the present invention and
Substitute also all among scope of the invention.Therefore, the impartial conversion made without departing from the spirit and scope of the invention and
Modification, all should be contained within the scope of the invention.
Claims (8)
1. a kind of ferrous alloy twin-screw Integral alloy bushing, it is characterised in that by the integral sinter molding of iron(-)base powder, press
Percentage by weight meter, the iron(-)base powder composition includes：B:1.00-3.50、C：0.50-2.00、Cr:3.00-15.00、
Ni:5.00-20.00、Si:1.50-4.00、W:0.00-5.00, Fe surplus.
2. ferrous alloy twin-screw Integral alloy bushing according to claim 1, it is characterised in that by weight percentage
Meter, the iron(-)base powder composition includes：B:1.50-3.00、C：0.80-1.60、Cr:6.00-12.00、Ni:8.00-
16.00、Si:2.00-3.50、W:0.00-3.00, Fe surplus.
3. ferrous alloy twin-screw Integral alloy bushing according to claim 2, it is characterised in that by weight percentage
Meter, the iron(-)base powder composition includes：B:2.00-2.50、C：1.00-1.40、Cr:9.00-10.00、Ni:10.00-
12.00、Si:2.50-3.00、W:0.00-1.50, Fe surplus.
4. the ferrous alloy twin-screw Integral alloy bushing according to claim any one of 1-3, it is characterised in that the base
The purity of alloy powder is all higher than 99.9%.
5. ferrous alloy twin-screw Integral alloy bushing according to claim 4, it is characterised in that the ferrous alloy is double
The foreign steamer Guo of screw rod Integral alloy bushing is ellipse, and Internal periphery is " 8 " font structure.
6. a kind of preparation method of ferrous alloy twin-screw Integral alloy bushing as described in claim 1-5, it is characterised in that
Comprise the following steps：
(1) die surface after the drying is brushed one layer of high-temperature mold lubricant and dried；
(2) iron-based is added up into powder packing to simultaneously ram-jolt in mold cavity；
(3) add up to the mould of powder to send into vacuum sintering furnace the above-mentioned iron-based that fills, heated up with 5-15 DEG C/min speed
To 1000-1600 DEG C, 30-250min is incubated；
(4) after insulation terminates, workpiece is cooled to after room temperature and come out of the stove, remove sintering mold, produce ferrous alloy twin-screw overall
Alloy bushing.
7. the preparation method of ferrous alloy twin-screw Integral alloy bushing according to claim 6, it is characterised in that described
In step (1) drying temperature of mould be 220-250 DEG C, drying temperature be 30min.
8. the preparation method of ferrous alloy twin-screw Integral alloy bushing according to claim 6, it is characterised in that described
1100-1400 DEG C is warming up to 7-12 DEG C/min speed in step (3), 50-120min is incubated.
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| CN108994302A (en) * | 2018-07-23 | 2018-12-14 | 东莞华晶粉末冶金有限公司 | A kind of new type stainless steel. corrosion resistance screw rod preparation method |
| CN109530704A (en) * | 2019-01-30 | 2019-03-29 | 武汉天和技术股份有限公司 | A kind of preparation method of plasma flare hollow cathode |
| CN109807178A (en) * | 2017-11-21 | 2019-05-28 | 上海梅山钢铁股份有限公司 | A kind of side guide plate of hot rolling recoiler and preparation method thereof |
| CN112643000A (en) * | 2020-11-27 | 2021-04-13 | 张正良 | Manufacturing method of double-screw barrel bushing |
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| CN101623922A (en) * | 2009-07-31 | 2010-01-13 | 上海永言特种材料研究所 | Manufacturing technology of integral inner and outer inverted V-shaped or inner inverted V-shaped iron-based alloy inner bushing |
| CN106041096A (en) * | 2016-06-27 | 2016-10-26 | 滁州帝邦科技有限公司 | Preparation method for wear-resisting and corrosion-resisting bearing bush for water-cooling box |
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| US5352539A (en) * | 1992-10-27 | 1994-10-04 | Friedrich Theysohn Gmbh | Extruder housing for double-screw extruder having an annularly stepped internal bore covered by a hot isostatically-pressed structure, and method of making same |
| CN101623922A (en) * | 2009-07-31 | 2010-01-13 | 上海永言特种材料研究所 | Manufacturing technology of integral inner and outer inverted V-shaped or inner inverted V-shaped iron-based alloy inner bushing |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109807178A (en) * | 2017-11-21 | 2019-05-28 | 上海梅山钢铁股份有限公司 | A kind of side guide plate of hot rolling recoiler and preparation method thereof |
| CN108994302A (en) * | 2018-07-23 | 2018-12-14 | 东莞华晶粉末冶金有限公司 | A kind of new type stainless steel. corrosion resistance screw rod preparation method |
| CN109530704A (en) * | 2019-01-30 | 2019-03-29 | 武汉天和技术股份有限公司 | A kind of preparation method of plasma flare hollow cathode |
| CN112643000A (en) * | 2020-11-27 | 2021-04-13 | 张正良 | Manufacturing method of double-screw barrel bushing |
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