CN110270689A - A kind of bimetal tube sleeve forming technique - Google Patents
A kind of bimetal tube sleeve forming technique Download PDFInfo
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- CN110270689A CN110270689A CN201810206371.3A CN201810206371A CN110270689A CN 110270689 A CN110270689 A CN 110270689A CN 201810206371 A CN201810206371 A CN 201810206371A CN 110270689 A CN110270689 A CN 110270689A
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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
- B22F5/106—Tube or ring forms
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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
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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 discloses a kind of bimetal tube sleeve forming technique, comprising the following steps: the preparation of raw material and substrate；Green body is made in raw material and substrate that preparation is completed；Ungrease treatment is carried out to green body；Preheating is carried out to the green body for completing ungrease treatment, obtains workpiece；Workpiece is subjected to vacuum outgas；The workpiece for completing vacuum outgas is placed on carrying roller；According to the revolving speed of the aperture adjustment carrying roller of workpiece；Carrying roller pushes workpiece to pass through the induction coil of fever, obtains preform pipe sleeve；Preform pipe sleeve is machined out.Using this technique can reduce the crackle of bimetallic pipe sleeve, flake, stomata the defects of, yield rate greatly improved.
Description
Technical field
The present invention relates to the technical field of bimetallic pipe sleeve processing technology more particularly to a kind of bimetal tube sleeve forming works
Skill.
Background technique
Bimetallic pipe sleeve is to coat one layer of specific alloy layer in common iron matrix inner hole, and it is made to generate metallurgical bonding,
Inner bore of part is set to obtain the properties such as excellent wearability and corrosion resistance, thus the requirement under meeting extreme operating condition.
Bimetallic tubing product currently on the market, generally uses centrifugally cast technological forming, and high-end then uses heat etc.
Static pressure sintering.
Centrifugal casting is that alloy powder is packed into substrate inner hole, makes alloy melting by induction heating, then high speed rotation,
So that alloy molten solution is overlying on substrate inner hole under the influence of centrifugal force, solidifies and obtain bimetal tube.Centrifugal casting is to equipment requirement
It is low and apply wide weary, however, being directed to centrifugally cast process characteristic, have the shortcomings that inevitable, centrifugal casting pairing alloy
The mobility of melt is more demanding, in order to obtain preferable mobility, the wetting agents such as B, Mn is often added, thus to a certain degree
On change the ingredient of alloy, reduce some properties of alloy；For adding the composite alloy powder of carbide ceramics phase
End, ceramic phase fusing point is very high, and liquid phase lacks poor fluidity, cannot reach ideal effect using centrifugal casting；Centrifugal casting is by work
The influence of part size is big, and the big centrifugal force in aperture is larger, and alloy structure compactness is higher, and small-bore workpiece centrifugal force is smaller, closes
The dense structure's property of gold is lower；Various elements or alloy specific gravity are different in alloy, and segregation is easy to happen in centrifugal process, is caused
Alloy uniformity is deteriorated, to reduce the comprehensive performance of alloy.
The bimetallic pipe sleeve of HIP sintering, dense structure's property is very high, can obtain the alloy-layer of high quality, its right work
Skill is complicated, very high to equipment, personnel requirement.The design of hot isostatic pressing jacket, welding requirements are high, otherwise can leak in sintering
Gas and lead to scrap of the product；The biggish workpiece deformation of draw ratio is big, and the difficulty of correction is higher, and timing alloy-layer is also easy to produce crackle
Even it is broken；It is larger to machine difficulty, processing cost is high；Hot isostatic apparatus is expensive, and complex process, single furnace production cost is very
It is high.
Therefore, no matter not being able to satisfy the requirement of vast manufacturer using centrifugal casting or HIP sintering.
Summary of the invention
It is an object of the present invention to: a kind of bimetal tube sleeve forming technique is provided, can be reduced using this technique double
The crackle of metal pipe sleeve, flake, stomata the defects of, yield rate, while strong applicability, simple process, compactness greatly improved
Height, the period is short, at low cost.
To achieve this purpose, the present invention adopts the following technical scheme: a kind of bimetal tube sleeve forming technique, including following step
It is rapid:
The preparation of raw material and substrate；
Green body is made in raw material and substrate that preparation is completed；
Ungrease treatment is carried out to green body；
Preheating is carried out to the green body for completing ungrease treatment, obtains workpiece；
Workpiece is subjected to vacuum outgas；
The workpiece for completing vacuum outgas is placed on carrying roller；
According to the revolving speed of the aperture adjustment carrying roller of workpiece；
The induction coil that carrying roller pushes workpiece to pass through fever carries out induction sintering, obtains preform pipe sleeve；
Preform pipe sleeve is machined out.
As a kind of perferred technical scheme, the preparation of the raw material and substrate, specifically:
Alloy powder and binder are mixed, mixed-powder is obtained；
Mixed-powder is dried；
Broken granulation is carried out to the mixed-powder after drying.
As a kind of perferred technical scheme, green body is made in the raw material that preparation is completed and substrate, specifically:
Rubber sleeve is placed in the inner hole of substrate；
Mixed-powder after broken granulation is packed between substrate and rubber sleeve, end cap is locked after jolt ramming；
Compaction treatment is carried out to substrate using isostatic cool pressing pressure, obtains green body.
As a kind of perferred technical scheme, the preparation of the raw material and substrate, specifically:
Wet ball-milling processing is carried out after alloy powder, binder, dispersing agent and azeotropic solvent are mixed, and obtains mixed slurry；
The bubble in mixed slurry is discharged by vacuumize process.
As a kind of perferred technical scheme, green body is made in the raw material that preparation is completed and substrate, specifically:
Mixed slurry is packed into the inside of substrate, and locks end cap；
Substrate equipped with mixed slurry is placed on roller；
Roller is rotated, so that slurry is prolonged stream using centrifugal movement, dry, obtain green body；
Green body is subjected to drying and processing.
It is as a kind of perferred technical scheme, described that ungrease treatment is carried out to green body, specifically:
Positive hydrogen pressure ungrease treatment, the ungrease treatment of nitrogen negative pressure or argon gas negative pressure ungrease treatment are carried out to green body；
Continue to heat up, pre-sintering molding is carried out to green body, obtains workpiece.
It is as a kind of perferred technical scheme, described that workpiece is subjected to vacuum outgas, specifically:
By Work piece sealing, one end connects vacuum pump set；
Start vacuum pump set, inside workpiece is carried out to vacuumize decompression processing；
The connection iron pipe of high-frequency induction heating workpiece and vacuum pump set；
When the local temperature for connecting iron pipe reaches preset temperature, pinch off connects iron pipe, and workpiece is fully sealed.
As a kind of perferred technical scheme, the induction coil that the carrying roller pushes workpiece to pass through fever carries out induction burning
Knot, obtains preform pipe sleeve, specifically:
The workpiece for completing vacuum outgas is placed on carrying roller；
According to the revolving speed of the aperture adjustment carrying roller of workpiece；
The induction coil for pushing workpiece to pass through fever carries out induction sintering, obtains preform pipe sleeve.
As a kind of perferred technical scheme, the temperature of the ungrease treatment is appointing in 150 degrees Celsius -600 degrees Celsius
One temperature.
As a kind of perferred technical scheme, the temperature for being pre-sintered processing is in 600 degrees Celsius -1000 degrees Celsius
Any temperature, the temperature of the induction sintering are any temperature in 1000 degrees Celsius -1350 degrees Celsius.
The invention has the benefit that a kind of bimetal tube sleeve forming technique is provided, and in this technique sintering process, quick heating
It is cooling fast, the short feature of sintering time, therefore specific energy consumption is lower, while alloy structure crystal grain is tiny, segregation is smaller,
Improve the intensity hardness and wearability of alloy.The bimetallic pipe sleeve product produced by this technique, inner hole possess excellent resistance to
Corrosion resistance is ground, alloy and substrate, which generate metallurgy, higher bond strength, and the compactness of alloy-layer is suitable with centrifugal casting, but
Organize crystal grain thinner, segregation is small, and comprehensive performance is superior to centrifugal casting technique；This technique reduces and splits relative to normal sintering
Line, flake, stomata the defects of, greatly improved yield rate, and alloy inner wall shape rule, consistency of thickness are concentric with outer circle
Degree is high, therefore machining allowance is small, and consumption powder is less, reduces production cost.This technique is not high to equipment requirement, production cost ratio
HIP sintering wants much lower, therefore with good economic efficiency and social benefit.
Detailed description of the invention
The present invention will be further described in detail below based on the drawings and embodiments.
Fig. 1 is a kind of flow chart of bimetal tube sleeve forming technique described in embodiment one；
Fig. 2 is a kind of flow chart of bimetal tube sleeve forming technique described in embodiment two；
Fig. 3 is isostatic cool pressing base schematic diagram described in embodiment one；
Fig. 4 is that centrifugation described in embodiment two is cast base schematic diagram；
Fig. 5 is induction sintering centrifugal forming schematic diagram described in embodiment one.
Specific embodiment
To further illustrate the technical scheme of the present invention below with reference to the accompanying drawings and specific embodiments.
Embodiment one: in this present embodiment, a kind of bimetal tube sleeve forming technique, comprising the following steps: raw material and substrate
Preparation；Green body is made in raw material and substrate that preparation is completed；Ungrease treatment is carried out to green body；To the green body for completing ungrease treatment
Preheating is carried out, workpiece is obtained；Workpiece is subjected to vacuum outgas；The workpiece for completing vacuum outgas is placed on carrying roller；Root
According to the revolving speed of the aperture adjustment carrying roller of workpiece；The induction coil that carrying roller pushes workpiece to pass through fever carries out induction sintering, obtains pre-
Finished product pipe sleeve；Preform pipe sleeve is machined out.
Being pre-sintered processing is solid-phase sintering, it is therefore an objective to which the alloy green body for obtaining some strength, in pre-burning, alloy will be generated
A series of physical-chemical reaction improves blank strength by the metallurgical bonding between particle.Calcined temperature is according to the object of powder
Depending on managing characteristic, alloy powder Binder Phase liquidus curve hereinafter, do not generate liquid phase or be merely creating micro liquid phase, make powder
It is mutually bonded between particle, green body tissue at this time is more loose, but has certain intensity, will not be crushed in the handling process.
The pre-sintering temperature of ferrous alloy is approximately 600 DEG C -850 DEG C；The pre-sintering temperature of nickel-base alloy is approximately 700 DEG C -900 DEG C；Cobalt-based
The pre-sintering temperature of alloy is approximately 750 DEG C -1000 DEG C；The sintering temperature of Mo2FeB2 based ceramic metal is approximately 700 DEG C -850 DEG C；
The sintering temperature of Mo2NiB2 based ceramic metal is approximately 750 DEG C -900 DEG C.
The workpiece of sealing degassing is placed on carrying roller and is rotated, adjusts suitable revolving speed, general alloy portion depending on pore size
The linear velocity of position reaches 1.5-3m/s, and workpiece is promoted to flow slowly over induction coil, meanwhile, workpiece is closed by induction heating rapidly, core
Gold need to reach 1000-1350 DEG C of sintering temperature, and alloy generates a certain amount of liquid phase, and under the influence of centrifugal force, alloy is close
It is fitted in substrate hole wall, while substrate and alloy interpenetrate generation metallurgical bonding under high temperature action.By adjusting induction heating
Speed that power and workpiece promote controls heating rate and sintering temperature.The sintering temperature of different-alloy is different, addition
The sintering temperature of the composite alloy of ceramic phase is more higher by 30-120 DEG C.After entire workpiece passes through coil, that is, sintering is completed,
Obtain the dual alloy pipe sleeve of the uniform wall thickness of dense structure.
In this present embodiment, the preparation of the raw material and substrate, specifically: alloy powder and binder are mixed,
Obtain mixed-powder；Mixed-powder is dried；Broken granulation is carried out to the mixed-powder after drying.Alloy powder is pressed one
Certainty ratio adds binder, and usual binder has paraffin, polyethylene glycol, rubber etc., adds by the weight percent of 1.5%-9%,
Its powder is uniformly mixed with binder by wet ball-milling or mechanical stirring, is crushed and is granulated after dry, is just obtained with certain
The powder of the surface cladding binder of mobility.
Alloy powder generallys use Self-fusing powder, such as iron-based powder, nickel base powder, Co-based powder, special operation condition are wanted
It asks down, it is more demanding to wearability, iron-based, the Ni-based, cobalt of addition carbide hard phase (such as WC, CrC, TiC, VC) can be used
Base complex alloy powder and Mo2FeB2 and Mo2NiB2 based ceramic metal powder etc..
In this present embodiment, green body is made in the raw material that preparation is completed and substrate, specifically: it is put in the inner hole of substrate
Set rubber sleeve；Mixed-powder after broken granulation is packed between substrate and rubber sleeve, end cap is locked after jolt ramming；Using cold etc. quiet
Pressure pressure carries out compaction treatment to substrate, obtains green body.
It is felt relieved first using special fixture, keeps rubber sleeve concentric with substrate, after powder is packed into, by green body in shock platforms
Interior powder ram-jolt, then seals gum cover, structure as shown in Figure 2.By the isostatic cool pressing pressure of 80-300MPa by green body densification
It is real.Isostatic cool pressing pressure is bigger, and green body is more closely knit, and intensity is higher.
It is in this present embodiment, described that ungrease treatment is carried out to green body, specifically: normal sintering furnace is used, green body is carried out
Ungrease treatment；It then proceedes to heat up, workpiece is pre-sintered, obtain workpiece.
Degreasing and pre-sintering, using normal sintering furnace, degreasing is carried out continuously with pre-sintering with furnace.Axial direction is prolonged in putting for workpiece
Direction is divided into horizontal put and puts with vertical, generally use it is vertical put, the deformation of workpiece is minimum.Positive hydrogen pressure can be used in degreasing
Degreasing or nitrogen, argon gas negative pressure degreasing.The oxide in powder can be restored using hydrogen degreasing, drop low-alloyed oxygen content.
Different degreasing process is used according to different binders, skimming temp is generally at 100 DEG C -600 DEG C.After of continuing rising after the completion of degreasing
Temperature carries out vacuum pre-sintering, obtains the double metal workpiece of some strength.
It is in this present embodiment, described that workpiece is subjected to vacuum outgas, specifically: workpiece both ends are sealed, wherein one end connects
Connect vacuum pump set；Start vacuum pump set, inner hole of workpiece is carried out to vacuumize decompression processing；Connection iron pipe close to workpiece is carried out
High-frequency induction heating；When the local temperature for connecting iron pipe reaches preset temperature, pinch off connects iron pipe, and workpiece is fully sealed.
This process is the preparation before induction sintering, end cap seal is welded at workpiece both ends, an end cap passes through thin iron
Pipe connects vacuum pump set, and vacuumizing makes overpressure lower than after 20pa, and at the position for leaning on proximal cover, high-frequency induction heating connects iron
Pipe, makes local heating up to preset temperature, and connection iron pipe is pinched pinch off with pinch off pincers, inner hole of workpiece is fully sealed and keeps true
Dummy status.Inner hole vacuum degree will affect the quality of alloy sintering, and pressure is too high or poorly sealed and gas leakage will make alloy oxidation, produce
The defects of angry hole crackle；Even inner air tube is sharply expanded at high temperature and is burst, and accident occurs.
It is in this present embodiment, described that workpiece induction sintering is obtained into preform pipe sleeve, specifically: vacuum outgas will be completed
Workpiece be placed on carrying roller, according to the revolving speed of the aperture adjustment carrying roller of workpiece, rotating idler, carrying roller drives Work piece high-speed rotation
Centrifugal force is generated, the induction coil for then pushing workpiece to flow slowly over fever carries out induction sintering, and core alloy reaches sintering temperature
Degree, and generates a certain amount of liquid phase, and under the action of centrifugal force and high temperature, alloy and substrate generate metallurgical bonding, obtain in advance at
Quality control set.
In this present embodiment, the preset temperature is 800 degrees Celsius.
In this present embodiment, the temperature of the ungrease treatment is 150 degrees Celsius.
In this present embodiment, the temperature of the preheating is 600 degrees Celsius.
In this present embodiment, the induction sintering temperature is 1000 degrees Celsius
As shown in Figure 1, a kind of bimetal tube sleeve forming technique, detailed process are as follows:
1, alloy powder and binder are mixed, obtains mixed-powder；
2, mixed-powder is dried；
3, broken granulation is carried out to the mixed-powder after drying；
4, rubber sleeve is placed in the inner hole of substrate；
5, the mixed-powder after broken granulation is packed between substrate and rubber sleeve, end cap is locked after jolt ramming；
6, compaction treatment is carried out to substrate using isostatic cool pressing pressure, obtains green body；
7, positive hydrogen pressure ungrease treatment is carried out to green body, wherein the temperature of ungrease treatment is 150 degrees Celsius；
8, preheating is carried out to the green body for completing ungrease treatment, wherein the temperature of preheating is 600 degrees Celsius, obtains work
Part；
9, by Work piece sealing, one end connects vacuum pump set；
10, start vacuum pump set, inside workpiece is carried out to vacuumize decompression processing；
11, iron pipe is connected in one end high-frequency induction heating close to workpiece；
12, when the local temperature for connecting iron pipe reaches 800 degrees Celsius, pinch off connects iron pipe；
13, the workpiece for completing vacuum outgas is placed on carrying roller；
14, according to the revolving speed of the aperture adjustment carrying roller of workpiece；
15, the induction coil that carrying roller pushes workpiece to pass through fever carries out induction sintering, obtains preform pipe sleeve；
16, preform pipe sleeve is machined out.
The bimetallic pipe sleeve class products application of present invention process production is being infused in material tube of injection machine, mixing granulator machine expects pipe
When radioglold category powder materials (MIM), ceramic powders material and Halogen add fine plastic material, wear-corrosion resistance is obviously excellent
In other similar products.
The elemental composition of alloy powder is as shown in appendix 1:
The sintering temperature of alloy powder is as shown in subordinate list 2:
Embodiment two: in this present embodiment, a kind of bimetal tube sleeve forming technique, comprising the following steps: the system of raw material and substrate
It is standby；Green body is made in raw material and substrate that preparation is completed；Ungrease treatment is carried out to green body；The green body for completing ungrease treatment is carried out
Preheating obtains workpiece；Workpiece is subjected to vacuum outgas；The workpiece for completing vacuum outgas is placed on carrying roller；According to work
The revolving speed of the aperture adjustment carrying roller of part；The induction coil that carrying roller pushes workpiece to pass through fever carries out induction sintering, obtains preform
Pipe sleeve；Preform pipe sleeve is machined out.
In this present embodiment, the preparation of the raw material and substrate, specifically: by alloy powder, binder, dispersing agent and it is total to
Boil-off dose of progress wet ball-milling mixed processing, obtains the mixed slurry of suspension；It will be in mixed slurry by vacuumize process
Bubble discharge.By adjusting azeotropic solvent adding proportion and adjust the concentration of slurry, adjust the addition of binder and dispersing agent
Measure and adjust the viscosity of slurry.The concentration of slurry and the rate of drying of viscosity influence green body.The slurry of preparation must use as early as possible, long
The slurry alloy powder that time stands can be segregated, and need again ball milling mixing, degasification that can use.
In this present embodiment, green body is made in the slurry that preparation is completed and substrate, specifically: mixed slurry is packed into
The inner hole of substrate, and lock end cap；Substrate equipped with mixed slurry is placed on roller；Start roller, utilizes centrifugal movement
So that slurry is prolonged stream, obtains green body after dry.
Prepared slurry is poured into substrate inner hole, end cap is locked, is placed on roller, low speed uniform rotation makes
Slurry prolongs stream and uniform adhesion in substrate hole wall, and the green body of uniform wall thickness is obtained after to be dried.Due to prolonging stream molding blank inner wall
Thickness is uniform, and size is consistent, and green body thickness is thinner than isostatic cool pressing base；Green body wall thickness is thicker, and drying is slower.To billet surface without
After obvious liquid, revolving speed is improved, enhances blank strength under the influence of centrifugal force；Then baking oven is put the workpiece in further to dry
Green body.Green body made of stream is prolonged using centrifugation, inner hole rule, thickness are uniform, and size is consistent, but blank density and intensity are than cold etc.
Static pressure base wants slightly lower.
It is in this present embodiment, described that ungrease treatment is carried out to green body, specifically: normal sintering furnace is used, green body is carried out
Ungrease treatment；It then proceedes to heat up, workpiece is pre-sintered, obtain workpiece.
Degreasing and pre-sintering, using normal sintering furnace, degreasing is carried out continuously with pre-sintering with furnace.Axial direction is prolonged in putting for workpiece
Direction is divided into horizontal put and puts with vertical, generally use it is vertical put, the deformation of workpiece is minimum.Positive hydrogen pressure can be used in degreasing
Degreasing or nitrogen, argon gas negative pressure degreasing, wherein hydrogen degreasing can restore the oxide in powder.It is adopted according to different binders
With different degreasing process, skimming temp is generally at 100 DEG C -600 DEG C.Continue to heat up after the completion of degreasing, carry out vacuum pre-sintering,
Obtain the double metal workpiece of some strength.
It is in this present embodiment, described that workpiece is subjected to vacuum outgas, specifically: workpiece both ends are sealed, wherein one end connects
Connect vacuum pump set；Start vacuum pump set, inner hole of workpiece is carried out to vacuumize decompression processing；Connection iron pipe close to workpiece is carried out
High-frequency induction heating；When the local temperature for connecting iron pipe reaches preset temperature, pinch off connects iron pipe, and workpiece is fully sealed.
This process is the preparation before induction sintering, end cap seal is welded at workpiece both ends, an end cap passes through thin iron
Pipe connects vacuum pump set, and vacuumizing makes overpressure lower than after 20pa, and at the position for leaning on proximal cover, high-frequency induction heating connects iron
Pipe, makes local heating up to preset temperature, and connection iron pipe is pinched pinch off with pinch off pincers, inner hole of workpiece is fully sealed and keeps true
Dummy status.Inner hole vacuum degree will affect the quality of alloy sintering, and pressure is too high or poorly sealed and gas leakage will make alloy oxidation, produce
The defects of angry hole crackle；Even inner air tube is sharply expanded at high temperature and is burst, and accident occurs.
It is in this present embodiment, described that workpiece induction sintering is obtained into preform pipe sleeve, specifically: vacuum outgas will be completed
Workpiece be placed on carrying roller, according to the revolving speed of the aperture adjustment carrying roller of workpiece, rotating idler, carrying roller drives Work piece high-speed rotation
Centrifugal force is generated, the induction coil for then pushing workpiece to flow slowly over fever carries out induction sintering, and core alloy reaches sintering temperature
Degree, and generates a certain amount of liquid phase, and under the action of centrifugal force and high temperature, alloy and substrate generate metallurgical bonding, obtain in advance at
Quality control set.
In this present embodiment, the preset temperature is 1000 degrees Celsius.
In this present embodiment, the temperature of the ungrease treatment is 600 degrees Celsius.
In this present embodiment, the temperature of the preheating is 1000 degrees Celsius.
As shown in Fig. 2, a kind of bimetal tube sleeve forming technique, detailed process are as follows:
1, alloy powder, binder, dispersing agent and azeotropic solvent are subjected to wet ball-milling mixed processing, obtain mixed slurry；
2, the bubble in mixed slurry is discharged by vacuumize process；
3, mixed slurry is packed into the inner hole of substrate, and locks end cap；
4, the substrate equipped with mixed slurry is placed on roller；
5, roller is rotated, so that slurry is prolonged stream using centrifugal movement, obtains green body after dry；
6, the ungrease treatment of argon gas negative pressure is carried out to green body, wherein the temperature of ungrease treatment is 600 degrees Celsius；
7, preheating is carried out to the green body for completing ungrease treatment, wherein the temperature of preheating is 1000 degrees Celsius, obtains work
Part；
8, workpiece both ends are sealed, wherein one end connects vacuum pump set；
9, start vacuum pump set, inner hole of workpiece is vacuumized and carries out decompression processing；
10, iron pipe is connected in one end high-frequency induction heating close to workpiece；
11, when the local temperature for connecting iron pipe reaches 1000 degrees Celsius, pinch off connects iron pipe；
12, the workpiece for completing vacuum outgas is placed on carrying roller；
13, according to the revolving speed of the aperture adjustment carrying roller of workpiece；
14, the induction coil that carrying roller pushes workpiece to pass through fever carries out induction sintering, obtains preform pipe sleeve；
15, preform pipe sleeve is machined out.
It is to be understood that above-mentioned specific embodiment is only that presently preferred embodiments of the present invention and institute's application technology are former
Reason, within the technical scope of the present disclosure, variation that anyone skilled in the art is readily apparent that or
Replacement, should be covered by the scope of protection of the present invention.
Claims (10)
1. a kind of bimetal tube sleeve forming technique, which comprises the following steps:
The preparation of raw material and substrate；
Green body is made in raw material and substrate that preparation is completed；
Ungrease treatment is carried out to green body；
Preheating is carried out to the green body for completing ungrease treatment, obtains workpiece；
Workpiece is subjected to vacuum outgas；
The workpiece for completing vacuum outgas is placed on carrying roller；
According to the revolving speed of the aperture adjustment carrying roller of workpiece；
The induction coil that carrying roller pushes workpiece to pass through fever carries out induction sintering, obtains preform pipe sleeve；
Preform pipe sleeve is machined out.
2. a kind of bimetal tube sleeve forming technique according to claim 1, which is characterized in that the system of the raw material and substrate
It is standby, specifically:
Alloy powder and binder are mixed, mixed-powder is obtained；
Mixed-powder is dried；
Broken granulation is carried out to the mixed-powder after drying.
3. a kind of bimetal tube sleeve forming technique according to claim 2, which is characterized in that the original for completing preparation
Green body is made with substrate in material, specifically:
Rubber sleeve is placed in the inner hole of substrate；
Mixed-powder after broken granulation is packed between substrate and rubber sleeve, end cap is locked after jolt ramming；
Compaction treatment is carried out to substrate using isostatic cool pressing pressure, obtains green body.
4. a kind of bimetal tube sleeve forming technique according to claim 1, which is characterized in that the system of the raw material and substrate
It is standby, specifically:
Wet ball-milling processing is carried out after alloy powder, binder, dispersing agent and azeotropic solvent are mixed, and obtains mixed slurry；
The bubble in mixed slurry is discharged by vacuumize process.
5. a kind of bimetal tube sleeve forming technique according to claim 4, which is characterized in that the original for completing preparation
Green body is made with substrate in material, specifically:
Mixed slurry is packed into the inside of substrate, and locks end cap；
Substrate equipped with mixed slurry is placed on roller；
Roller is rotated, so that slurry is prolonged stream using centrifugal movement, dry, obtain green body；
Green body is subjected to drying and processing.
6. a kind of bimetal tube sleeve forming technique according to claim 1, which is characterized in that described to carry out degreasing to green body
Processing, specifically:
Positive hydrogen pressure ungrease treatment, the ungrease treatment of nitrogen negative pressure or argon gas negative pressure ungrease treatment are carried out to green body；
Continue to heat up, pre-sintering molding is carried out to green body.
7. a kind of bimetal tube sleeve forming technique according to claim 1, which is characterized in that described that workpiece is carried out vacuum
Degassing, specifically:
By Work piece sealing, one end connects vacuum pump set；
Start vacuum pump set, inside workpiece is carried out to vacuumize decompression processing；
The connection iron pipe of high-frequency induction heating workpiece and vacuum pump set；
When the local temperature for connecting iron pipe reaches preset temperature, pinch off connects iron pipe, and workpiece is fully sealed.
8. a kind of bimetal tube sleeve forming technique according to claim 1, which is characterized in that the carrying roller pushes workpiece to wear
The induction coil for crossing fever carries out induction sintering, obtains preform pipe sleeve, specifically:
The workpiece for completing vacuum outgas is placed on carrying roller；
According to the revolving speed of the aperture adjustment carrying roller of workpiece；
The induction coil for pushing workpiece to pass through fever carries out induction sintering, obtains preform pipe sleeve.
9. a kind of bimetal tube sleeve forming technique according to claim 1, which is characterized in that the temperature of the ungrease treatment
For any temperature in 150 degrees Celsius -600 degrees Celsius.
10. a kind of bimetal tube sleeve forming technique according to claim 1, which is characterized in that the pre-sintering processing
Temperature is any temperature in 600 degrees Celsius -1000 degrees Celsius, and the temperature of the induction sintering is 1000 degree Celsius -1350 and takes the photograph
Any temperature in family name's degree.
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