CN108580907A - A kind of preparation method and parallel double-screw extruder screwing element of the surface peening layer of screwing element - Google Patents
A kind of preparation method and parallel double-screw extruder screwing element of the surface peening layer of screwing element Download PDFInfo
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- CN108580907A CN108580907A CN201810578588.7A CN201810578588A CN108580907A CN 108580907 A CN108580907 A CN 108580907A CN 201810578588 A CN201810578588 A CN 201810578588A CN 108580907 A CN108580907 A CN 108580907A
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- surface peening
- peening layer
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- screwing element
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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
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
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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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/103—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/108—Mixtures obtained by warm mixing
-
- 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
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
-
- 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
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
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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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The present invention relates to a kind of preparation method of the surface peening layer of screwing element and parallel double-screw extruder screwing elements, belong to Screw extruder technology field.Preparation method includes：Mixing tungsten-carbide powder, self-fusible alloy powder of nickel-base and binder, mixing obtain feeding；The matrix of surface peening layer to be prepared is placed in mold and reserves the filling space of feeding；Feeding is injected in filling space, then dewaxes, is sintered.This method is relatively simple, and production efficiency is high, it can be achieved that near-net-shape, reduces following process, especially suitable lot-size metaplasia production.The surface of parallel double-screw extruder screwing element has the surface peening layer that metallurgical binding intensity is high, wear-resisting property is excellent, and the surface peening layer and matrix metallurgical binding are good, has apparent transition region, Tissue distribution uniform；And the surface peening layer, close to full densification, hardness height (>=64.5HRC), compared with the prior art anticorrosive anti-wear function admirable, service life extends 2 times or more.
Description
Technical field
The present invention relates to Screw extruder technology fields, and the preparation of the surface peening layer of more particularly to a kind of screwing element
Method and parallel double-screw extruder screwing element.
Background technology
Screwing element is the critical component of parallel double-screw extruder.Plastic raw materials are conveyed by screwing element, are pressed
Real, fusing, stirring, are finally flowed out with certain pressure and flow from extrusion.In recent years, as plastic raw materials industry is quickly sent out
Exhibition, various enhancing modified engineered plastic raw materials are constantly released, and traditional screwing element can not carry processing, and these enhance modification
The demand of raw material, main cause are screwing element surface erosion resistance performance and high temperature resistance bonding abrasion degraded performance, and abrasion is lost
Excessive velocities are imitated, the ability of lasting conveying plastic raw materials is lost, finally greatly shortens extruder service life.For this purpose, screw thread
The anticorrosive anti-wear performance of element surface is in urgent need to be improved.
Current useful various ways carry out intensive treatment to screwing element surface, but all there are various defects：Such as it is hot
Plating, carburizing are narrow to the range of material selection, and its coating abrasion resistance properties prepared is inadequate；Chromium plating, thermal spraying, heap
Although weldering, hardened layer have preferable wearability, but, wearing layer relatively low with substrate combinating strength is easily detached with matrix, is caused
It peels off, and production efficiency is low etc..
Invention content
One of the objects of the present invention is to provide a kind of preparation methods of the surface peening layer of screwing element, and this method is more
Simply, production efficiency is high, it can be achieved that near-net-shape, reduces following process, especially suitable lot-size metaplasia production.
The second object of the present invention is to provide a kind of parallel double-screw extruder screwing element, and surface has by upper
State the surface peening layer that preparation method is prepared.
The present invention solves its technical problem using following technical scheme to realize：
The present invention proposes a kind of preparation method of the surface peening layer of screwing element, includes the following steps：Mix tungsten carbide
Powder, self-fusible alloy powder of nickel-base and binder, mixing obtain feeding；The matrix of surface peening layer to be prepared is placed in mold
And reserve the filling space of feeding；Feeding is injected in filling space, then dewaxes, is sintered.
The present invention also proposes a kind of parallel double-screw extruder screwing element, parallel double-screw extruder screw thread member
The surface of part has is prepared surface peening layer by above-mentioned preparation method.
The preparation method and parallel double-screw of the surface peening layer for the screwing element that present pre-ferred embodiments provide squeeze out
The advantageous effect of machine screwing element includes：
The preparation method of the surface peening layer for the screwing element that present pre-ferred embodiments provide is relatively simple, production efficiency
Height reduces following process, it can be achieved that near-net-shape, is especially suitable for lot-size metaplasia production.Parallel double-screw extruder screw thread
Element is with the excellent surface peening layer of metallurgical binding intensity height, the wear-resisting property being prepared by above-mentioned preparation method, the table
Surface strengthening layer and matrix metallurgical binding are good, have apparent transition region, Tissue distribution uniform.And the surface peening layer is close to entirely
Densification, hardness height (>=64.5HRC), compared with the prior art anticorrosive anti-wear function admirable, service life extends 2 times or more.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described.
Fig. 1 is that the parallel double-screw extruder screwing element with surface peening layer green compact is regarded first in embodiment 3
Structural schematic diagram under angle；
Fig. 2 is that the parallel double-screw extruder screwing element with surface peening layer green compact is regarded second in embodiment 3
Structural schematic diagram under angle；
Fig. 3 is the knot of the sintered parallel double-screw extruder screwing element with surface peening layer in embodiment 3
Structure schematic diagram.
Specific implementation mode
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, builds according to normal condition or manufacturer
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
Below to the preparation method and parallel double-screw extruder of the surface peening layer of the screwing element of the embodiment of the present invention
It is specifically described with screwing element.
The embodiment of the present invention provides a kind of preparation method of the surface peening layer of screwing element, can refer to, the preparation side
Method for example may comprise steps of：Mixing tungsten-carbide powder, self-fusible alloy powder of nickel-base and binder, mixing obtain feeding；
The matrix (screwing element) of surface peening layer to be prepared is placed in mold and reserves the filling space of feeding；Feeding is injected
It in filling space, then dewaxes, is sintered.
Specifically, the mixed process of tungsten-carbide powder, self-fusible alloy powder of nickel-base and binder can carry out step by step, first mix
Tungsten-carbide powder and self-fusible alloy powder of nickel-base are closed, metal mixed powder is obtained, is then mixed again with binder.It is above-mentioned to mix
To be carried out in mixer, i.e., first metal mixed powder is added in mixer to be preheated Cheng Junke, keeps metal mixed powder first fully mixed
Close, then add binder, to avoid binder is first added in the case of occur its first with tungsten-carbide powder or Ni-based from molten
Alloy powder combines, and influences the mixing situation with remaining raw material.
Optionally, the self-fusible alloy powder of nickel-base used in the embodiment of the present invention for example may include Ni60A powder, Ni45
At least one of powder and Ni65 powder.
Optionally, the raw material of the binder used in the embodiment of the present invention for example may include that paraffin, palm wax, high density are poly-
Ethylene, polypropylene, ethylene-vinyl acetate copolymer and stearic acid.Ground is can refer to, the raw material of binder includes 25-40 weight
The paraffin of part, polypropylene, the 1-5 of the palm wax of 15-25 parts by weight, the high density polyethylene (HDPE) of 5-20 parts by weight, 5-20 parts by weight
The ethylene-vinyl acetate copolymer of parts by weight and the stearic acid of 1-5 parts by weight.
The mass ratio of tungsten-carbide powder and self-fusible alloy powder of nickel-base can be (5：95)-(30： 70).Metal mixed powder
The mass ratio of end and binder can be (90：10)-(95：5).The ratio range of above-mentioned each material is preferable, is conducive to obtain group
It knits and is evenly distributed and the surface peening layer of function admirable.
Mixing can be that 90-180min is carried out under conditions of 140-165 DEG C, in this process, shearing and rubbing action
The temperature of binder is set to steeply rise, viscosity reduces, and increases the wettability on its surface, it is made fully to be connect with metal mixed powder
It touches.Metal mixed powder shearing-crushing repeatedly in mixer, binder is iteratively produced deformation and restores deformation, in mixer
Under the conditions of being stirred continuously, keep binder evenly dispersed in metal mixed powder, is preferably fed to obtain raw material mixed effect
Material.
Injection can be that feeding is added in injection molding machine, be then injection moulded, to be obtained centainly on the surface of matrix
The surface peening layer green compact of thickness.Optionally, the thickness of surface peening layer green compact can be 1-5mm.The thickness range can not only
Make surface peening layer green compact that there are preferable hardness, corrosion-resistant, abrasion resistance properties, extends the service life of screwing element, and
Will not have an adverse effect to the normal use of screwing element.
Injection temperature in injection process can be 140-190 DEG C, and injection pressure can be 50-140MPa, the temperature of mold
Degree can be 30-80 DEG C.Above-mentioned injecting condition is conducive to make surface peening layer to have good combination with matrix, and after being suitable for
Continuous sintering process causes later stage surface peening layer to crack to avoid injecting condition is excessively high.
Preferably, before injecting feeding, the surface of the matrix of surface peening layer to be prepared capable of washing, to avoid matrix surface
It retains impurity effect and prepares effect.
Further, dewaxing is to impregnate material (surface peening layer green compact) to be dewaxed in organic solvent, obtains surface
Strengthening layer degreased blank.Optionally, organic solvent may include at least one in trichloro ethylene, normal heptane, dichloromethane and kerosene
Kind.
Preferably, the immersion in the embodiment of the present invention be by surface peening layer green compact in 30-50 DEG C of organic solvent
12-36h is managed, to improve dewaxing efficiency and dewaxing effect.
Further, sintering can be 1 × 10 in 950-1200 DEG C and vacuum degree-3-1.2×10-3Under conditions of Pa
10-90min is carried out, also surface peening layer degreased blank is put into vacuum degreasing fritting furnace and is sintered with above-mentioned condition.
Preferably, 950-1200 is warming up to the rate of 2.5-3.5 DEG C/min (preferably 3 DEG C/min) in sintering process
℃.It is heated up with constant heating rate, temperature can be made in sintering process to stablize and risen, avoided fluctuating and too fast cause sinter
Matter is poor.It is worth noting that after heating rate is higher than 3.5 DEG C/min, especially 4 DEG C/min, in 950-1200 DEG C of condition
Lower sintering 10-90min (especially greater than 30min) be easy to cause sample cracking, and heating rate is less than 2.5 DEG C/min, especially
It is less than 2 DEG C/min, sintering efficiency can be substantially reduced.
In addition, according to above-mentioned suitable heating rate (2.5-3.5 DEG C/min), it is remaining viscous in surface peening layer degreased blank
Knot agent will can completely be removed when being warming up to 600 DEG C, and in the sintering process of the mitigation, can not only further be carried
Conjugation between high surface peening layer and matrix, while surface peening layer can also be made close to complete fine and close, hardness >=64.5HRC.
In addition, the embodiment of the present invention additionally provides a kind of parallel double-screw extruder screwing element, surface have by
Above-mentioned preparation method is prepared surface peening layer.The surface of the parallel double-screw extruder screwing element has metallurgical binding
The surface peening layer that intensity is high, wear-resisting property is excellent.Surface peening layer and matrix metallurgical binding are good, have apparent transition
Area, Tissue distribution are uniform.Surface peening layer is close to full densification, and hardness is high (>=64.5HRC), anticorrosive anti-wear function admirable,
Compared with the prior art service life extends 2 times or more.
The feature and performance of the present invention are described in further detail with reference to embodiments.
Embodiment 1
By tungsten-carbide powder and Ni60A powder with mass ratio for 5：95 mixed metal mixed powder are added in mixer
Feeding is made until binder is added at 140 DEG C continues mixing 180min in preheating.
Wherein, the mass ratio of metal mixed powder and binder is 90：10.Binder contains the paraffin of 25 parts by weight, 15
The ethene-vinyl acetate of the palm wax of parts by weight, the high density polyethylene (HDPE) of 5 parts by weight, the polypropylene of 5 parts by weight, 1 parts by weight
The stearic acid of copolymer and 1 parts by weight.
Cleaning treatment is carried out to screwing element matrix surface, matrix is put into mold and reserves the filling space of feeding.
Injection molding machine is added in feeding, in injection temperature be 140 DEG C, injection pressure 50MPa, the temperature of mold be 30 DEG C under conditions of into
Row injection moulding, the surface peening layer green compact of 1mm thickness are obtained on the surface of screwing element matrix.
Surface peening layer green compact are impregnated into 36h in 30 DEG C of trichloro ethylene solution, remove wax, it is de- to obtain surface peening layer
Fat base.
Surface peening layer degreased blank is put into vacuum degreasing fritting furnace, 950 are warming up to the heating rate of 2.5 DEG C/min
DEG C, then in 950 DEG C and vacuum degree be 1 × 10-3The condition of Pa is sintered 90min, obtains having the parallel double of surface peening layer
Screw extruder screwing element.
Embodiment 2
By tungsten-carbide powder and Ni45 powder with mass ratio for 30：70 mixed metal mixed powder are added in mixer
Feeding is made until binder is added at 165 DEG C continues mixing 90min in preheating.
Wherein, the mass ratio of metal mixed powder and binder is 95：5.Binder contains the paraffin of 40 parts by weight, 25
The ethyl vinyl acetate second of the palm wax of parts by weight, the high density polyethylene (HDPE) of 20 parts by weight, the polypropylene of 20 parts by weight, 5 parts by weight
The stearic acid of alkene copolymer and 5 parts by weight.
Cleaning treatment is carried out to screwing element matrix surface, matrix is put into mold and reserves the filling space of feeding.
Injection molding machine is added in feeding, in injection temperature be 190 DEG C, injection pressure 140MPa, under conditions of the temperature of mold is 80 DEG C
It is injection moulded, the surface peening layer green compact of 5mm thickness is obtained on the surface of screwing element matrix.
Surface peening layer green compact are impregnated into 12h in 50 DEG C of n-heptane solution, wax is removed, obtains surface peening layer degreasing
Base.
Surface peening layer degreased blank is put into vacuum degreasing fritting furnace, is warming up to the heating rate of 3.5 DEG C/min
1200 DEG C, then in 1200 DEG C and vacuum degree be 1.2 × 10-3The condition of Pa is sintered 10min, obtains having surface peening layer
Parallel double-screw extruder screwing element.
Embodiment 3
By tungsten-carbide powder and Ni65 powder with mass ratio for 15：85 mixed metal mixed powder are added in mixer
Feeding is made until binder is added at 155 DEG C continues mixing 135min in preheating.
Wherein, the mass ratio of metal mixed powder and binder is 92.5：7.5.Binder contain 30 parts by weight paraffin,
The ethyl vinyl acetate of the palm wax of 20 parts by weight, the high density polyethylene (HDPE) of 10 parts by weight, the polypropylene of 10 parts by weight, 3 parts by weight
The stearic acid of ethylene copolymer and 3 parts by weight.
Cleaning treatment is carried out to screwing element matrix surface, matrix is put into mold and reserves the filling space of feeding.
Injection molding machine is added in feeding, in injection temperature be 165 DEG C, injection pressure 95MPa, the temperature of mold be 55 DEG C under conditions of into
Row injection moulding, the surface peening layer green compact (please referring to Fig. 1 and Fig. 2) of 3mm thickness are obtained on the surface of screwing element matrix.
Surface peening layer green compact are impregnated for 24 hours in 40 DEG C of dichloromethane solution, wax is removed, it is de- to obtain surface peening layer
Fat base.
Surface peening layer degreased blank is put into vacuum degreasing fritting furnace, 1050 are warming up to the heating rate of 3 DEG C/min
DEG C, then in 1050 DEG C and vacuum degree be 1.1 × 10-3The condition of Pa is sintered 50min, obtains having the parallel of surface peening layer
Double screw extruder screwing element (please refers to Fig. 3).
Embodiment 4
By tungsten-carbide powder and self-fusible alloy powder of nickel-base with mass ratio for 10：90 mixed metal mixed powder are added
It is preheated in mixer, until binder is added at 145 DEG C continues mixing 120min, feeding is made.Self-fusible alloy powder of nickel-base contains
Ni60A powder and Ni45 powder.
Wherein, the mass ratio of metal mixed powder and binder is 92：8.Binder contains the paraffin of 35 parts by weight, 18
The ethyl vinyl acetate second of the palm wax of parts by weight, the high density polyethylene (HDPE) of 15 parts by weight, the polypropylene of 15 parts by weight, 2 parts by weight
The stearic acid of alkene copolymer and 2 parts by weight.
Cleaning treatment is carried out to screwing element matrix surface, matrix is put into mold and reserves the filling space of feeding.
Injection molding machine is added in feeding, in injection temperature be 150 DEG C, injection pressure 80MPa, the temperature of mold be 40 DEG C under conditions of into
Row injection moulding, the surface peening layer green compact of 2mm thickness are obtained on the surface of screwing element matrix.
Surface peening layer green compact are impregnated into 20h in 35 DEG C of dichloromethane and kerosene mixed solution, wax is removed, obtains
Surface peening layer degreased blank.
Surface peening layer degreased blank is put into vacuum degreasing fritting furnace, is warming up to the heating rate of 2.5 DEG C/min
1000 DEG C, then in 1000 DEG C and vacuum degree be 1.05 × 10-3The condition of Pa is sintered 30min, obtains with surface peening layer
Parallel double-screw extruder screwing element.
Embodiment 5
By tungsten-carbide powder and self-fusible alloy powder of nickel-base with mass ratio for 20：80 mixed metal mixed powder are added
It is preheated in mixer, until binder is added at 150 DEG C continues mixing 140min, feeding is made.Self-fusible alloy powder of nickel-base contains
Ni60A powder and Ni65 powder.
Wherein, the mass ratio of metal mixed powder and binder is 94：6.Binder contains the paraffin of 38 parts by weight, 22
The ethyl vinyl acetate second of the palm wax of parts by weight, the high density polyethylene (HDPE) of 18 parts by weight, the polypropylene of 12 parts by weight, 4 parts by weight
The stearic acid of alkene copolymer and 4 parts by weight.
Cleaning treatment is carried out to screwing element matrix surface, matrix is put into mold and reserves the filling space of feeding.
Injection molding machine is added in feeding, in injection temperature be 180 DEG C, injection pressure 100MPa, under conditions of the temperature of mold is 60 DEG C
It is injection moulded, the surface peening layer green compact of 4mm thickness is obtained on the surface of screwing element matrix.
Surface peening layer green compact are impregnated into 25h in the mixed solution of 45 DEG C of trichloro ethylene, normal heptane and dichloromethane,
Wax is removed, surface peening layer degreased blank is obtained.
Surface peening layer degreased blank is put into vacuum degreasing fritting furnace, is warming up to the heating rate of 3.5 DEG C/min
1100 DEG C, then in 1100 DEG C and vacuum degree be 1.1 × 10-3The condition of Pa is sintered 70min, obtains having surface peening layer
Parallel double-screw extruder screwing element.
Embodiment 6
By tungsten-carbide powder and self-fusible alloy powder of nickel-base with mass ratio for 25：75 mixed metal mixed powder are added
It is preheated in mixer, until binder is added at 160 DEG C continues mixing 160min, feeding is made.Self-fusible alloy powder of nickel-base contains
Ni60A powder, Ni45 powder and Ni65 powder.
Wherein, the mass ratio of metal mixed powder and binder is 93：7.Binder contains the paraffin of 30 parts by weight, 20
The ethyl vinyl acetate second of the palm wax of parts by weight, the high density polyethylene (HDPE) of 10 parts by weight, the polypropylene of 10 parts by weight, 3 parts by weight
The stearic acid of alkene copolymer and 3 parts by weight.
Cleaning treatment is carried out to screwing element matrix surface, matrix is put into mold and reserves the filling space of feeding.
Injection molding machine is added in feeding, in injection temperature be 170 DEG C, injection pressure 120MPa, under conditions of the temperature of mold is 70 DEG C
It is injection moulded, the surface peening layer green compact of 3mm thickness is obtained on the surface of screwing element matrix.
Surface peening layer green compact are soaked in the mixed solution of 50 DEG C of trichloro ethylene, normal heptane, dichloromethane and kerosene
30h is steeped, wax is removed, obtains surface peening layer degreased blank.
Surface peening layer degreased blank is put into vacuum degreasing fritting furnace, 1150 are warming up to the heating rate of 3 DEG C/min
DEG C, then in 1150 DEG C and vacuum degree be 1.15 × 10-3The condition of Pa is sintered 60min, obtains having the flat of surface peening layer
Row double screw extruder screwing element.
Test example
It repeats to implement above-described embodiment 1-6, obtains enough parallel double-screw extruder screwing elements.With existing skill
The method of the hot plating of art carries out intensive treatment to the surface of screwing element, obtains the screwing element of control group, compares through the present invention
The surface to screwing element of embodiment carries out the screwing element of screwing element and control group obtained by intensive treatment, result
As shown in table 1.
1 comparing result of table
As can be seen from Table 1, the method for the surface Hardening Treatment provided through the embodiment of the present invention can be compared with the prior art
Method can improve the hardness of surface peening layer, improve the bond strength with matrix, prolong the service life, while can also improve life
Efficiency is produced, lot-size metaplasia production is suitble to.
In addition, it can be seen from fig.1 to fig.3 that the screwing element prepared through preparation method provided in an embodiment of the present invention
Surface smoothness and dimensional accuracy it is preferable, surface peening layer is high with matrix combination degree, and no separation, peeling and cracking are existing
As.
In conclusion the preparation method of the surface peening layer for the screwing element that present pre-ferred embodiments provide is more simple
Single, production efficiency is high, it can be achieved that near-net-shape, reduces following process, especially suitable lot-size metaplasia production.Parallel double-screw squeezes
It is strong with the excellent surface of metallurgical binding intensity height, the wear-resisting property being prepared by above-mentioned preparation method with screwing element to go out machine
Change layer, the surface peening layer and matrix metallurgical binding are good, have apparent transition region, Tissue distribution uniform.And the surface is strong
Change layer close to full densification, hardness height (>=64.5HRC), compared with the prior art anticorrosive anti-wear function admirable, service life is prolonged
Long 2 times or more.
Embodiments described above is a part of the embodiment of the present invention, instead of all the embodiments.The reality of the present invention
The detailed description for applying example is not intended to limit the range of claimed invention, but is merely representative of the selected implementation of the present invention
Example.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
Every other embodiment, shall fall within the protection scope of the present invention.
Claims (10)
1. a kind of preparation method of the surface peening layer of screwing element, which is characterized in that include the following steps：Mix tungsten carbide powder
End, self-fusible alloy powder of nickel-base and binder, mixing obtain feeding；The matrix of the surface peening layer to be prepared is placed in mould
Has and reserves the filling space of the feeding；The feeding is injected in the filling space, is then dewaxed, is sintered.
2. preparation method according to claim 1, which is characterized in that first mix the tungsten-carbide powder and it is described it is Ni-based from
Molten alloy powder, obtains metal mixed powder, is then mixed again with the binder；
Preferably, the mass ratio of the tungsten-carbide powder and the self-fusible alloy powder of nickel-base is (5：95)-(30：70)；
Preferably, the mass ratio of the metal mixed powder and the binder is (90：10)-(95：5).
3. preparation method according to claim 1, which is characterized in that the raw material of the binder include paraffin, palm wax,
High density polyethylene (HDPE), polypropylene, ethylene-vinyl acetate copolymer and stearic acid.
4. preparation method according to claim 3, which is characterized in that in terms of parts by weight, the raw material packet of the binder
Include the paraffin of 25-40 parts by weight, the palm wax of 15-25 parts by weight, 5-20 parts by weight the high density polyethylene (HDPE),
The polypropylene of 5-20 parts by weight, the ethylene-vinyl acetate copolymer of 1-5 parts by weight and 1-5 parts by weight it is described
Stearic acid.
5. according to claim 1-4 any one of them preparation methods, which is characterized in that mixing is the condition in 140-165 DEG C
Lower carry out 90-180min.
6. according to claim 1-4 any one of them preparation methods, which is characterized in that the injection temperature in injection process is
140-190 DEG C, injection pressure 50-140MPa, the temperature of the mold is 30-80 DEG C.
7. according to claim 1-4 any one of them preparation methods, which is characterized in that dewaxing be will material be dewaxed in organic
It is impregnated in solvent, the organic solvent includes at least one of trichloro ethylene, normal heptane, dichloromethane and kerosene.
8. preparation method according to claim 7, which is characterized in that immersion is in 30-50 DEG C of the organic solvent
Handle 12-36h.
9. according to claim 1-4 any one of them preparation methods, which is characterized in that sintering is in 950-1200 DEG C and true
Reciprocal of duty cycle is 1 × 10-3-1.2×10-310-90min is carried out under conditions of Pa；
Preferably, in sintering process 950-1200 DEG C is warming up to the rate of 2.5-3.5 DEG C/min；
More preferably, in sintering process 950-1200 DEG C is warming up to the rate of 3 DEG C/min.
10. a kind of parallel double-screw extruder screwing element, which is characterized in that parallel double-screw extruder screw thread member
The surface of part has is prepared surface peening layer by such as claim 1-9 any one of them preparation method.
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| CN201810578588.7A CN108580907A (en) | 2018-06-05 | 2018-06-05 | A kind of preparation method and parallel double-screw extruder screwing element of the surface peening layer of screwing element |
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| CN112643000A (en) * | 2020-11-27 | 2021-04-13 | 张正良 | Manufacturing method of double-screw barrel bushing |
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