CN106180241A - A kind of high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer and preparation method thereof - Google Patents
A kind of high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer and preparation method thereof Download PDFInfo
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- CN106180241A CN106180241A CN201610569371.0A CN201610569371A CN106180241A CN 106180241 A CN106180241 A CN 106180241A CN 201610569371 A CN201610569371 A CN 201610569371A CN 106180241 A CN106180241 A CN 106180241A
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- speed steel
- cold extrusion
- tungsten carbide
- steel cold
- extrusion punch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
- B21C25/025—Selection of materials therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/10—Making tools by operations not covered by a single other subclass
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- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
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Abstract
The invention discloses a kind of high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer, including high-speed steel Cold Extrusion Punch body, the surface of described punch body has the tubular body of multiple depression, and the surface of described punch body and the inner surface of described tubular body are respectively provided with micron order tungsten carbide enhancement layer；The preparation method of above-mentioned high-speed steel Cold Extrusion Punch is: punch body is carried out surface process；Then laser boring, pickling, ultrasonic waves for cleaning are carried out；The punch body with depression tubular body after the cleaning that will obtain carries out carburizing in vacuum cementation furnace, obtains the complex with micron order tungsten carbide enhancement layer；Finally carry out the high-speed steel Cold Extrusion Punch that post processing obtains having micron order tungsten carbide enhancement layer.The present invention solves existing high-speed steel Cold Extrusion Punch and solves easy permanent deformation, easy fracture, the problem of cracky, improves the overall mechanical property of composite and heat-resisting, anti-wear performance, and preparation method is simple, it is easy to implement.
Description
Technical field
The invention belongs to Stamping Die Technology field, be specifically related to a kind of high-speed steel with micron order tungsten carbide enhancement layer
Cold Extrusion Punch, the invention still further relates to the preparation method of this high-speed steel Cold Extrusion Punch.
Background technology
Diel is the requisite technological equipment of punching production, is technology-intensive product.The quality of stamping parts, life
Produce efficiency and production cost etc., have direct relation with the precision quality etc. of Design of Dies and dieparts.Cold extrusion
Punch operationally, is subjected to the effect of axial impact force, the most inevitably bears the effect of radial force, its unit pressure
Up to product blank material strength degree 4 ~ 6 times.Owing to metal flows in die cavity during extruding, make the work of punch and die
Violent friction is all born in face.This friction and metal are extruded the drastic deformation of material, are carried by the instantaneous temperature of die surface
High arrival 200 ~ 300 DEG C, therefore it is required that fractureing and crooked fatigue fracture must not occur when long-term work in Cold Extrusion Punch, and
Require have higher wearability and Resisting fractre ability.
The material of Cold Extrusion Punch can use carbon tool steel, alloy tool steel and high-speed steel etc..Carbon tool steel
Quenching degree is low, wearability is poor, quenching distortion is big, is suitable to manufacture that some sizes are little, the cold-extruded belling of simple shape, light load
Mould.Alloy tool steel, such as Cr12MoV, after heat treatment, hardness is 60 ~ 62 HRC, has high wearability, quenching degree, high heat
Stability and high comprcssive strength, but, the segregation of eutectic carbide and the existence of net carbide in its tissue, need through
Technique is improved " to change forging ".High-speed steel is the most frequently used material, and it has hardness, wearability and pressure resistance the highest in mould steel
Degree, bearing capacity is the highest.But when the high-speed steel selecting single material does Cold Extrusion Punch, owing to its toughness is poor, need to use
Low temperature quenching technique, to improve its toughness.
It can be seen that with single carbon tool steel, alloy tool steel or high-speed steel as material, Cold Extrusion Punch is firmly
Degree, matching of strength and toughness there is also contradiction, not yet reach the unification of strength and toughness.Therefore, the master of Cold Extrusion Punch
Failure mode is wanted mainly to have permanent deformation, fracture and breakage.On the basis of original single material Cold Extrusion Punch, also need exploitation
Go out to take into account the novel Cold Extrusion Punch of excellent abrasive resistance and toughness.
Tungsten carbide have higher specific stiffness, specific modulus, low thermal coefficient of expansion and good heat stability, wearability,
The advantages such as dimensional stability and the wettability good with ferrous materials, have the cold of tungsten carbide enhancement layer with it for reinforcement preparation
Extruding punch, can increase substantially Cold Extrusion Punch case hardness and intensity, utilize reaction in-situ tungsten carbide enhancement layer simultaneously
And bond strength high between high speed steel substrate, it is achieved the raising of Cold Extrusion Punch toughness.
Summary of the invention
It is an object of the invention to provide a kind of high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer, to solve
The existing easy permanent deformation of high-speed steel Cold Extrusion Punch, easy fracture, the problem of cracky.
It is a further object to provide the preparation method of above-mentioned high-speed steel Cold Extrusion Punch.
The technical solution adopted in the present invention is, a kind of high-speed steel cold-extruded belling with micron order tungsten carbide enhancement layer
Mould, including high-speed steel Cold Extrusion Punch body, the surface of described high-speed steel Cold Extrusion Punch body has the tubulose of multiple depression
Body, the described surface of high-speed steel Cold Extrusion Punch body and the inner surface of described tubular body are respectively provided with micron order tungsten carbide to be strengthened
Layer.
Further, the spacing between described tubular body is 25 μm～1000 μm, the caliber of described tubular body be 10 μm～
40 μm, the degree of depth of tubular body is not more than 20 μm.
Further, the thickness of described micron order tungsten carbide enhancement layer is 5 μm～15 μm, and tungsten carbide enhancement layer is by tungsten carbide
Granule form, tungsten carbide particle is evenly distributed in high-speed steel Cold Extrusion Punch body, the particle diameter of tungsten carbide particle be 0.5 μm～
3.0 μm, the volume fraction of tungsten carbide particle is 70%～95%.
Further, the matrix of described high-speed steel Cold Extrusion Punch body is martensite, carbide and residual austenite
The combination of body.
The preparation method of a kind of high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer, comprises the following steps:
Step 1: high-speed steel Cold Extrusion Punch body is carried out surface process, obtains surface-treated high-speed steel Cold Extrusion Punch
Body；
Step 2: the surface-treated high-speed steel Cold Extrusion Punch body utilizing laser-beam drilling machine to obtain described step 1 is carried out
Laser boring, then carries out pickling, rinses to neutral with water afterwards, finally carry out ultrasonic waves for cleaning, having after being cleaned
The high-speed steel Cold Extrusion Punch body of depression tubular body；
Step 3: the high-speed steel Cold Extrusion Punch body with depression tubular body after the cleaning obtain described step 2 is placed in very
Empty carburizer carries out carburizing, and held for some time at a certain temperature, obtains that there is answering of micron order tungsten carbide enhancement layer
Fit；
Step 4: the complex with micron order tungsten carbide enhancement layer described step 3 obtained carries out annealing, grade quench with
Three times lonneal processes, and obtains the high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer.
Further, the surface of described step 1 processes and is specially clear for high-speed steel Cold Extrusion Punch body surface acetone
Wash clean.
Further, in described step 2, laser boring is carried out under vacuum condition or inert gas shielding.
Further, in described step 2 pickling use acid solution be volumetric concentration be the hydrochloric acid of 300ml/L, 60ml/L
Any one in the sulphuric acid of phosphoric acid, the hydrogen peroxide of 120ml/L, the Fluohydric acid. of 300ml/L or 200ml/L, described ultrasound wave is clear
Wash use ethanol or acetone.
Further, in described step 3, in vacuum cementation furnace, carbon mass concentration is 0.9%～1.0%, and vacuum is not more than 1
×104 Pa, carburizing temperature is 920 DEG C～940 DEG C, and the unit are endosmosis carbonaceous amount of high-speed steel Cold Extrusion Punch body surface is divided
Number is less than 0.5%, and temperature retention time is 10 min～35min.
Further, described step 4 is annealed at 880 DEG C, is incubated 3 h, then 840 DEG C of preheatings, then at 1280 DEG C
Lower heating grade quench, hierarchical temperature is 620 DEG C, then lonneal three times at 560 DEG C, and tempering insulation time is 1h.
The invention has the beneficial effects as follows: invent a kind of high-speed steel cold-extruded belling with micron order tubular tungsten carbide enhancement layer
Mould, tungsten atom and carbon atom react generation tungsten carbide under solid state temperature, and utilize the position limitation carbonization in the hole accomplished fluently in advance
The diffusion of tungsten, is metallurgical binding between tungsten carbide particle and high-speed steel Cold Extrusion Punch body, is firmly combined with, granule difficult drop-off,
The grain volume fraction of phase, distribution and shape can be strengthened by controlling carburizing process parameters and laser boring state modulator tungsten carbide
State, improves surface strength and the hardness of existing high-speed steel Cold Extrusion Punch, improves the heat-resisting of composite and anti-wear performance,
Utilize bond strength high between reaction in-situ tungsten carbide enhancement layer and high speed steel substrate, it is achieved Cold Extrusion Punch toughness simultaneously
Improve, solve the easy permanent deformation of high-speed steel Cold Extrusion Punch, easy fracture, the problem of cracky, and preparation method is simple, it is easy to be real
Execute.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention has the high-speed steel Cold Extrusion Punch of micron order tungsten carbide enhancement layer；
Fig. 2 is the high-speed steel Cold Extrusion Punch A district partial enlargement structural representation that the present invention has micron order tungsten carbide enhancement layer；
Fig. 3 is the high-speed steel Cold Extrusion Punch B district partial enlargement structural representation that the present invention has micron order tungsten carbide enhancement layer,
I.e. micron order tubular tungsten carbide structural representation.
In figure, 1. high-speed steel Cold Extrusion Punch body, 2. tungsten carbide enhancement layer, 3. tungsten carbide particle, 4. tubular body.
Detailed description of the invention
The present invention is described in detail with detailed description of the invention below in conjunction with the accompanying drawings.
A kind of high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer of the present invention, as shown in Fig. 1 ~ 3, including height
Speed steel Cold Extrusion Punch body 1, the surface of high-speed steel Cold Extrusion Punch body 1 has the tubular body 4 of multiple depression, tubular body 4
Between spacing be 25 μm～1000 μm, the caliber of tubular body 4 is 10 μm～40 μm, and the degree of depth of tubular body 4 is not more than 20 μm,
It is 5 μm～15 μm micron order tungsten carbides that the surface of high-speed steel Cold Extrusion Punch body 1 and the inner surface of tubular body 4 are respectively provided with thickness
Enhancement layer 2, contains the tungsten carbide particle 3 of high-volume fractional in tungsten carbide enhancement layer 2.The particle diameter of tungsten carbide particle 3 be 0.5 μm～
3.0 μm, the volume fraction of tungsten carbide particle 3 is 70%～95%, and the matrix of high-speed steel Cold Extrusion Punch body 1 is geneva
Body, a small amount of carbide and minimal amount of retained austenite.
Particularly, a kind of high-speed steel Cold Extrusion Punch basic material with micron order tungsten carbide enhancement layer of the present invention
It is xW18Cr4V, xW14Cr4VMn, xW9Mo3Cr4V.
The preparation method of above-mentioned high-speed steel Cold Extrusion Punch, specifically includes following steps:
Step 1: high-speed steel Cold Extrusion Punch body surface acetone is cleaned up, obtains surface-treated high-speed steel cold-extruded
Belling mould body；
Step 2: utilize the surface-treated height that step 1 is obtained under vacuum condition or inert gas shielding by laser-beam drilling machine
Speed steel Cold Extrusion Punch body carries out laser boring, then carries out pickling, the acid solution that pickling uses be volumetric concentration be 300ml/L
Hydrochloric acid, the phosphoric acid of 60ml/L, the hydrogen peroxide of 120ml/L, the Fluohydric acid. of 300ml/L or 200ml/L sulphuric acid in any one
Kind, afterwards with water flushing to neutral, finally use ethanol or acetone to carry out ultrasonic waves for cleaning, the depression that has after being cleaned is managed
The high-speed steel Cold Extrusion Punch body of shape body；
Step 3: the high-speed steel Cold Extrusion Punch body with depression tubular body after cleaning step 2 obtained is placed in vacuum and oozes
Carrying out carburizing in carbon stove at a certain temperature, in vacuum cementation furnace, carbon mass concentration is 0.9%～1.0%, vacuum is not more than 1 ×
104 Pa, carburizing temperature is 920 DEG C～940 DEG C, the endosmosis carbon mass fraction of unit are of high-speed steel Cold Extrusion Punch body surface
Less than 0.5%, it is incubated 10 min～35min, obtains the complex with micron order tungsten carbide enhancement layer；
Step 4: the complex with micron order tungsten carbide enhancement layer step 3 obtained is annealed at 880 DEG C, is incubated 3 h, so
After 840 DEG C of preheatings, then at 1280 DEG C heat grade quench, hierarchical temperature is 620 DEG C, then lonneal three at 560 DEG C
Secondary, tempering insulation time is 1h.Afterwards, the high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer is i.e. obtained.
Laser boring, carburizing and Technology for Heating Processing are combined by the present invention, obtain micro-on high-speed steel Cold Extrusion Punch surface
Meter level tungsten carbide enhancement layer, and there is in this enhancement layer the tubular body of depression；The tubular body of depression is by the carbon of high-volume fractional
Change tungsten particle and a small amount of high speed steel substrate composition.
Carburizing temperature selects 920 DEG C～940 DEG C and is because, carburizing more than 940 DEG C, on the one hand, carbon expansion in the base
Scattered coefficient can raise rapidly, and diffusion velocity is too fast, and diffusion depth increases, and is unfavorable for tungsten carbide volume fraction in tungsten carbide enhancement layer
Raising；On the other hand, carburizing temperature is higher than 940 DEG C, the tungsten carbide particle of generation can be made to grow up rapidly, cause under mechanical property
Fall.Carburizing temperature is less than 920 DEG C, it is possible to decrease diffusion kinetics, matrix surface concentration of carbon is relatively low.
In vacuum cementation furnace, carbon mass concentration selects 0.9%～1.0% to be because: carbon mass concentration is higher than 1.0%, and carbon is at base
Diffusion velocity in body is accelerated, and diffusion depth increases, and is unfavorable for the raising of tungsten carbide volume fraction in tungsten carbide enhancement layer；Carbonaceous
Amount concentration is less than 0.9%, and matrix surface concentration of carbon is too low.
In vacuum cementation furnace, temperature retention time selects 10min～35min to be because: temperature retention time is higher than 35min, tungsten carbide meeting
Concentrate and spread in matrix, be unfavorable for keeping the high-volume fractional of tungsten carbide in tungsten carbide enhancement layer；Temperature retention time is less than
10min, the carbon in carburized layer can not react completely, affects the reinforced effects of enhancement layer.
The invention has the beneficial effects as follows:
1) laser drilling is utilized to realize micron order blind hole at high-speed steel Cold Extrusion Punch body surface in vacuum environment
Preparation, and its spacing, the degree of depth, diameter etc. can be adjusted；
2) high-speed steel Cold Extrusion Punch body and outer carbon source are in heating, insulating process, make tungsten atom and carbon atom in solid-state temperature
The lower reaction of degree generates tungsten carbide, and utilizes the diffusion of the position limitation tungsten carbide in the hole accomplished fluently in advance, it is achieved micron order tubulose carbon
Change tungsten and strengthen the preparation of high-speed steel Cold Extrusion Punch；
3) tubular tungsten carbide reinforcement can be effectively increased the surface recombination thickness of high-speed steel Cold Extrusion Punch；
4) tubular tungsten carbide internal diameter is 10～40 μm, and micro-hardness can reach 1850～2100 HV, and high-speed steel Cold Extrusion Punch is hard
Degree reaches 62 ~ 65 HRC, impact flexibilitya KCan reach 10～15 J/cm2, high-speed steel Cold Extrusion Punch resistance to is greatly improved
Mill performance and comprehensive serviceability.
5) tungsten carbide particle in tubular tungsten carbide and be metallurgical binding between matrix, is firmly combined with, granule difficult drop-off.With
Time, can by control carburizing process parameters and laser boring state modulator tungsten carbide strengthen the grain volume fraction of phase, distribution and
Form.The kind of matrix, alloying level, fractions distribution etc. regulate also dependent on working condition requirement, reach to strengthen and matrix phase
Between performance most preferably mate.
6) preparation method is simple, easy, easy to operate, it is simple to implement.
Embodiment 1
Step 1: high-speed steel Cold Extrusion Punch body surface acetone is cleaned up, obtains surface-treated high-speed steel cold-extruded
Belling mould body；
Step 2: utilize the surface-treated high-speed steel Cold Extrusion Punch that step 1 is obtained by laser-beam drilling machine under vacuum
Body carries out laser boring, and aperture is 30 μm, and hole depth is 20 μm, and pitch of holes is 1000 μm；Then carrying out pickling, pickling uses
Acid solution be volumetric concentration be the hydrochloric acid of 300ml/L, rinse to neutral with water afterwards, finally use ethanol to carry out ultrasonic waves for cleaning,
The high-speed steel Cold Extrusion Punch body with depression tubular body after being cleaned；
Step 3: the high-speed steel Cold Extrusion Punch body with depression tubular body after cleaning step 2 obtained is placed in vacuum and oozes
Carrying out carburizing in carbon stove at a temperature of 920 DEG C, in vacuum cementation furnace, carbon mass concentration is 0.9%, and vacuum is not more than 1 × 104
Pa, the endosmosis carbon mass fraction of unit are of high-speed steel Cold Extrusion Punch body surface is less than 0.5%, is incubated 10 min, obtains
There is high-speed steel this composite of Cold Extrusion Punch of micron order tungsten carbide enhancement layer；
Step 4: high-speed steel this composite of Cold Extrusion Punch with micron order tungsten carbide enhancement layer step 3 obtained exists
Annealing at 880 DEG C, be incubated 3 h, then 840 DEG C of preheatings, then heat grade quench at 1280 DEG C, hierarchical temperature is 620 DEG C,
Lonneal three times at 560 DEG C again, tempering insulation time is 1h, obtains the high-speed steel with micron order tungsten carbide enhancement layer
Cold Extrusion Punch.
In gained high-speed steel Cold Extrusion Punch, the thickness of micron order tubular silicon carbide tungsten layer is about 5 μm, and its tissue includes grain
Footpath is granular carbonization tungsten and the martensitic matrix of 0.5 ~ 1.2 μm, and the volume fraction of tungsten carbide particle is 70%.Tubular tungsten carbide
Micro-hardness is 1850HV, and the hardness of high-speed steel Cold Extrusion Punch is 62HRC, impact flexibility aKCan reach 15 J/cm2。
Embodiment 2
Step 1: hot high-speed steel Cold Extrusion Punch body surface acetone is cleaned up, obtains surface-treated high-speed steel cold
Extruding punch body；
Step 2: the surface-treated high-speed steel utilizing that step 1 obtains under noble gas argon shield by laser-beam drilling machine is cold
Extruding punch body carries out laser boring, and aperture is 20 μm, and hole depth is 18 μm, and pitch of holes is 25 μm；Then pickling, pickling are carried out
The acid solution used be volumetric concentration be the Fluohydric acid. of 300ml/L, rinse to neutral with water afterwards, finally use acetone to carry out ultrasonic
Ripple cleans, the high-speed steel Cold Extrusion Punch body with depression tubular body after being cleaned；
Step 3: the high-speed steel Cold Extrusion Punch body with depression tubular body after cleaning step 2 obtained is placed in vacuum and oozes
Carrying out carburizing in carbon stove at a temperature of 930 DEG C, in vacuum cementation furnace, carbon mass concentration is 1.0%, and vacuum is not more than 1 × 104
Pa, the endosmosis carbon mass fraction of unit are of high-speed steel Cold Extrusion Punch body surface is less than 0.5%, is incubated 20 min, obtains
There is high-speed steel this composite of Cold Extrusion Punch of micron order tungsten carbide enhancement layer；
Step 4: high-speed steel this composite of Cold Extrusion Punch with micron order tungsten carbide enhancement layer step 3 obtained exists
Annealing at 880 DEG C, be incubated 3 h, then 840 DEG C of preheatings, then heat grade quench at 1280 DEG C, hierarchical temperature is 620 DEG C,
Lonneal three times at 560 DEG C again, tempering insulation time is 1h, obtains the high-speed steel with micron order tungsten carbide enhancement layer
Cold Extrusion Punch.
In gained high-speed steel Cold Extrusion Punch, the thickness of micron order tubular silicon carbide tungsten layer is about 9 μm, and its tissue includes grain
Footpath is granular carbonization tungsten and the martensitic matrix of 1.0 ~ 2.1 μm, and the volume fraction of tungsten carbide particle is 82%.Tubular tungsten carbide
Micro-hardness is 1975HV, and the hardness of high-speed steel Cold Extrusion Punch is 63 HRC, impact flexibility a of high-speed steel Cold Extrusion PunchK
Can reach 14 J/cm2。
Embodiment 3
Step 1: high-speed steel Cold Extrusion Punch body surface acetone is cleaned up, obtains surface-treated high-speed steel cold-extruded
Belling mould body；
Step 2: the surface-treated high-speed steel utilizing that step 1 obtains under noble gas argon shield by laser-beam drilling machine is cold
Extruding punch body carries out laser boring, and aperture is 10 μm, and hole depth is 17 μm, and pitch of holes is 350 μm；Then pickling is carried out, acid
Wash the acid solution of use be volumetric concentration be the sulphuric acid of 200ml/L, rinse to neutral with water afterwards, finally use ethanol to carry out ultrasonic
Ripple cleans, the high-speed steel Cold Extrusion Punch body with depression tubular body after being cleaned；
Step 3: the high-speed steel Cold Extrusion Punch body with depression tubular body after cleaning step 2 obtained is placed in vacuum and oozes
Carrying out carburizing in carbon stove at a temperature of 940 DEG C, in vacuum cementation furnace, carbon mass concentration is 0.94%, vacuum is not more than 1 ×
104 Pa, the endosmosis carbon mass fraction of unit are of high-speed steel Cold Extrusion Punch body surface is less than 0.5%, is incubated 35min,
To high-speed steel this composite of Cold Extrusion Punch with micron order tungsten carbide enhancement layer；
Step 4: high-speed steel this composite of Cold Extrusion Punch with micron order tungsten carbide enhancement layer step 3 obtained exists
Annealing at 880 DEG C, be incubated 3 h, then 840 DEG C of preheatings, then heat grade quench at 1280 DEG C, hierarchical temperature is 620 DEG C,
Lonneal three times at 560 DEG C again, tempering insulation time is 1h, obtains the high-speed steel with micron order tungsten carbide enhancement layer
Cold Extrusion Punch.
Gained high-speed steel Cold Extrusion Punch, the thickness of micron order tubular silicon carbide tungsten layer is 15 μm, and its tissue includes that particle diameter is
The granular carbonization tungsten of 1.8 ~ 3.0 μm and pearlite matrix, the volume fraction of tungsten carbide particle is 95%.Tubular tungsten carbide microcosmic
Hardness is 2100HV, and the hardness of high-speed steel Cold Extrusion Punch is 65HRC, impact flexibility a of high-speed steel Cold Extrusion PunchKCan reach
10 J/cm2。
Embodiment 4
Step 1: high-speed steel Cold Extrusion Punch body surface acetone is cleaned up, obtains surface-treated high-speed steel cold-extruded
Belling mould body；
Step 2: the surface-treated high-speed steel utilizing that step 1 obtains under noble gas argon shield by laser-beam drilling machine is cold
Extruding punch body carries out laser boring, and aperture is 40 μm, and hole depth is 18 μm, and pitch of holes is 700 μm；Then pickling is carried out, acid
Wash the acid solution of use be volumetric concentration be the hydrogen peroxide of 120ml/L, rinse to neutral with water afterwards, finally use ethanol to surpass
Sound wave cleans, the high-speed steel Cold Extrusion Punch body with depression tubular body after being cleaned；
Step 3: the high-speed steel Cold Extrusion Punch body with depression tubular body after cleaning step 2 obtained is placed in vacuum and oozes
Carrying out carburizing in carbon stove at a temperature of 935 DEG C, in vacuum cementation furnace, carbon mass concentration is 0.98%, vacuum is not more than 1 ×
104 Pa, the endosmosis carbon mass fraction of unit are of high-speed steel Cold Extrusion Punch body surface is less than 0.5%, is incubated 30 min,
Obtain high-speed steel this composite of Cold Extrusion Punch with micron order tungsten carbide enhancement layer；
Step 4: high-speed steel this composite of Cold Extrusion Punch with micron order tungsten carbide enhancement layer step 3 obtained exists
Annealing at 880 DEG C, be incubated 3 h, then 840 DEG C of preheatings, then heat grade quench at 1280 DEG C, hierarchical temperature is 620 DEG C,
Lonneal three times at 560 DEG C again, tempering insulation time is 1h, obtains the high-speed steel with micron order tungsten carbide enhancement layer
Cold Extrusion Punch.
In gained high-speed steel Cold Extrusion Punch, the thickness of micron order tubular silicon carbide tungsten layer is 12 μm, and its tissue includes particle diameter
Being granular carbonization tungsten and the martensitic matrix of 1.4 ~ 2.6 μm, the volume fraction of tungsten carbide particle is 90%.Tubular tungsten carbide is micro-
Sight hardness is 2060HV, and the hardness of high-speed steel Cold Extrusion Punch is 64HRC, impact flexibility a of high-speed steel Cold Extrusion PunchKUp to
To 12 J/cm2。
A kind of high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer of the present invention, its tissue signature is micron order
Tubular tungsten carbide uniform vertical is distributed in high-speed steel Cold Extrusion Punch body surface, and internal diameter is 10～40 μm, and the degree of depth is not more than 20
μm, spacing is adjustable in 25～1000 μ m.The thickness of tungsten carbide enhancement layer is 5～15 μm, the tissue bag of tubular tungsten carbide
Including the micron order tungsten carbide particle that equally distributed particle diameter is 0.5～3.0 μm, volume fraction is 70%～95%.Tubular tungsten carbide
Micro-hardness can reach 1850～2100 HV；The hardness of the high-speed steel Cold Extrusion Punch of high-speed steel Cold Extrusion Punch reaches 62 ~ 65
HRC, impact flexibility aKCan reach 10～15 J/cm2.By preparing micron order tubulose at high-speed steel Cold Extrusion Punch body surface
Tungsten carbide reinforcement, can further improve anti-wear performance and the resistance to elevated temperatures of high-speed steel Cold Extrusion Punch, utilizes in situ simultaneously
Bond strength high between reaction tungsten carbide enhancement layer and high speed steel substrate, it is achieved the raising of Cold Extrusion Punch toughness, solves height
The speed easy permanent deformation of steel Cold Extrusion Punch, easy fracture, the problem of cracky, and with low cost, preparation technology is simple.
Claims (10)
1. there is a high-speed steel Cold Extrusion Punch for micron order tungsten carbide enhancement layer, including high-speed steel Cold Extrusion Punch body,
It is characterized in that: the surface of described high-speed steel Cold Extrusion Punch body has the tubular body of multiple depression, described high-speed steel cold-extruded
The surface of belling mould body and the inner surface of described tubular body are respectively provided with micron order tungsten carbide enhancement layer.
The high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer the most according to claim 1, it is characterised in that
Spacing between described tubular body is 25 μm～1000 μm, and the caliber of described tubular body is 10 μm～40 μm, the degree of depth of tubular body
It is not more than 20 μm.
The high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer the most according to claim 1, it is characterised in that
The thickness of described micron order tungsten carbide enhancement layer is 5 μm～15 μm, and tungsten carbide enhancement layer is made up of tungsten carbide particle, tungsten carbide
Grain is evenly distributed in high-speed steel Cold Extrusion Punch body, and the particle diameter of tungsten carbide particle is 0.5 μm～3.0 μm, tungsten carbide particle
Volume fraction be 70%～95%.
The high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer the most according to claim 1, it is characterised in that
The combination that matrix is martensite, carbide and retained austenite of described high-speed steel Cold Extrusion Punch body.
5. the preparation method of a high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer, it is characterised in that include
Following steps:
Step 1: high-speed steel Cold Extrusion Punch body is carried out surface process, obtains surface-treated high-speed steel Cold Extrusion Punch
Body；
Step 2: the surface-treated high-speed steel Cold Extrusion Punch body utilizing laser-beam drilling machine to obtain described step 1 is carried out
Laser boring, then carries out pickling, rinses to neutral with water afterwards, finally carry out ultrasonic waves for cleaning, having after being cleaned
The high-speed steel Cold Extrusion Punch body of depression tubular body；
Step 3: the high-speed steel Cold Extrusion Punch body with depression tubular body after the cleaning obtain described step 2 is placed in very
Empty carburizer carries out carburizing, and held for some time at a certain temperature, obtains that there is answering of micron order tungsten carbide enhancement layer
Fit；
Step 4: the complex with micron order tungsten carbide enhancement layer described step 3 obtained carries out annealing, grade quench with
Three times lonneal processes, and obtains the high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer.
The preparation side of a kind of high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer the most according to claim 5
Method, it is characterised in that the surface of described step 1 processes to be specially to clean high-speed steel Cold Extrusion Punch body surface acetone and does
Only.
The preparation side of a kind of high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer the most according to claim 5
Method, it is characterised in that in described step 2, laser boring is carried out under vacuum condition or inert gas shielding.
The preparation side of a kind of high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer the most according to claim 5
Method, it is characterised in that in described step 2 pickling use acid solution be volumetric concentration be the phosphorus of the hydrochloric acid of 300ml/L, 60ml/L
Any one in the sulphuric acid of acid, the hydrogen peroxide of 120ml/L, the Fluohydric acid. of 300ml/L or 200ml/L, described ultrasonic waves for cleaning
Use ethanol or acetone.
The preparation side of a kind of high-speed steel Cold Extrusion Punch with micron order tungsten carbide enhancement layer the most according to claim 5
Method, it is characterised in that in described step 3, in vacuum cementation furnace, carbon mass concentration is 0.9%～1.0%, vacuum is not more than 1 ×
104 Pa, carburizing temperature is 920 DEG C～940 DEG C, the endosmosis carbon mass fraction of unit are of high-speed steel Cold Extrusion Punch body surface
Less than 0.5%, temperature retention time is 10 min～35min.
The preparation method of a kind of composite with micron order tungsten carbide enhancement layer the most according to claim 5, it is special
Levy and be, described step 4 is annealed at 880 DEG C, is incubated 3 h, then 840 DEG C of preheatings, then at 1280 DEG C, heat classification
Quenching, hierarchical temperature is 620 DEG C, then lonneal three times at 560 DEG C, and tempering insulation time is 1h.
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| CN106180241B (en) | 2018-09-21 |
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