CN106119662B - A kind of cobalt-chromium-tungsten alloy material, cobalt-chromium-tungsten alloy ball for ball-screw bearing and preparation method thereof, ball-screw bearing - Google Patents

A kind of cobalt-chromium-tungsten alloy material, cobalt-chromium-tungsten alloy ball for ball-screw bearing and preparation method thereof, ball-screw bearing Download PDF

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CN106119662B
CN106119662B CN201610617279.7A CN201610617279A CN106119662B CN 106119662 B CN106119662 B CN 106119662B CN 201610617279 A CN201610617279 A CN 201610617279A CN 106119662 B CN106119662 B CN 106119662B
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ball
chromium
cobalt
tungsten alloy
screw bearing
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CN106119662A (en
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冯颖
于琦
孔永刚
李夏
张永乾
张玲
孙永安
赵加帮
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Luoyang Bearing Research Institute Co Ltd
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Luoyang Bearing Science and Technology Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/07—Alloys based on nickel or cobalt based on cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/06—Alloys based on chromium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Rolling Contact Bearings (AREA)
  • Transmission Devices (AREA)

Abstract

Cobalt-chromium-tungsten alloy ball the invention discloses a kind of cobalt-chromium-tungsten alloy material, for ball-screw bearing and preparation method thereof, ball-screw bearing, the cobalt-chromium-tungsten alloy material are made up of the component of following mass percent：Cobalt 38%~48%, chromium 31%~41%, tungsten 16%~18%, nickel 2%~3%, graphite 2%~8%, iron and inevitable impurity element total amount≤1%.The cobalt-chromium-tungsten alloy material of the present invention, using cobalt, chromium, tungsten, nickel and graphite as key component, there is good intensity, wear-resistant, corrosion-resistant and thermal fatigue resistance, disclosure satisfy that heavy water, alkalescence, radiation environment condition of work；Using the bearing alloying pellet of the cobalt-chromium-tungsten alloy material, have the characteristics that corrosion-resistant, wear-resistant, precision is high and service life is long, be fully able to the use environment and performance requirement for meeting ball-screw bearing in nuclear reactor loading and unloading device transmission system.

Description

A kind of cobalt-chromium-tungsten alloy material, the cobalt-chromium-tungsten alloy ball for ball-screw bearing and Its preparation method, ball-screw bearing
Technical field
The invention belongs to bearing ball material and preparing technical field, and in particular to a kind of cobalt-chromium-tungsten alloy material, simultaneously Further relate to a kind of using cobalt-chromium-tungsten alloy ball for ball-screw bearing of the material and preparation method thereof, and use the cobalt The ball-screw bearing of chromium tungsten alloy ball.
Background technology
Ball-screw is actuated element most-often used on machine tool and precision optical machinery, and its major function is to transport rotation Turn changes linear movement into, or moment of torsion is converted into axial repeated action power, while has high accuracy, invertibity and efficient concurrently Feature.Because it has the frictional resistance of very little, ball-screw is widely used in various industrial equipments and precision instrument.By For ball-screw as in the nuclear reactor loading and unloading device transmission system of transmission mechanism, fuel manipulator crane push rod bearing belongs to centripetal Ball bearing, bearing are made up of inner ring, outer ring, collar, back-up ring and ball.Bearing is used to support 4 in fuel manipulator crane push-rod assembly Ball screw, the movable of push rod is realized by the rotation of ball screw.
By ball-screw, as in the nuclear reactor loading and unloading device transmission system of transmission mechanism, bearing needs anti-in core Answer and work under the conditions of heap heavy water, alkalescence, radiation environment, working condition is severe, it is desirable to rolling element is corrosion-resistant, the long-life, reliability It is high.At present, conventional bearing roller (ball) material is generally bearing steel etc..Bearing steel is also known as high-carbon chromium steel, and phosphorus content is 1% or so, chrome content 0.5%-1.65%.The chemical stability of bearing steel is limited, poor corrosion resistance, in some ratios Under relatively severe condition, such as Aeronautics and Astronautics, nuclear energy, chemistry, oil, food field, it is necessary to bearing in high temperature, high speed, corruption In use, steel bearings can not meet requirement under the particular surroundings such as erosion, vacuum, unlubricated.
In the prior art, cobalt-chromium-tungsten alloy (CoCrW) is one kind in Si Taili (Stellite) alloy, stellite It is a kind of ability all kinds abrasion and the hard alloy of corrosion and high-temperature oxydation.Cobalt-chromium-tungsten alloy be using cobalt as mainly into Point, contain the alloying element such as a considerable amount of chromium, tungsten and a small amount of nickel, molybdenum, silicon, carbon, niobium, tantalum.It is different from other high temperature alloys, Cobalt-chromium-tungsten alloy is strengthened by the orderly precipitated phase with matrix strong bonded, but the austenite by having been strengthened by solid solution A small amount of carbide composition is distributed in fcc matrixes and matrix.Cobalt-chromium-tungsten alloy has flat fracture strength-temperature relation, but More than 1000 DEG C but show than having excellent hot corrosion resistance under other high temperature.
But existing cobalt-chromium-tungsten alloy species is less, tends not to take into account high temperature corrosion-resisting and high wear resistance, also The requirement of ball-screw bearing in nuclear reactor loading and unloading device transmission system can not be met.
The content of the invention
It is an object of the invention to provide a kind of cobalt-chromium-tungsten alloy material, high temperature corrosion-resisting and high wear resistance are had concurrently, it is full The requirement of ball-screw bearing in sufficient nuclear reactor loading and unloading device transmission system.
Second object of the present invention is to provide a kind of cobalt-chromium-tungsten alloy ball for ball-screw bearing.
Third object of the present invention is to provide a kind of preparation method of the cobalt-chromium-tungsten alloy ball for ball-screw bearing.
Fourth object of the present invention is to provide a kind of ball-screw bearing using above-mentioned cobalt-chromium-tungsten alloy ball.
In order to realize the above object the technical solution adopted in the present invention is：
A kind of cobalt-chromium-tungsten alloy material, is made up of the component of following mass percent：Cobalt 38%~48%, chromium 31%~ 41%th, tungsten 16%~18%, nickel 2%~3%, graphite 2%~8%, iron and inevitable impurity element total amount≤1%.
A kind of cobalt-chromium-tungsten alloy ball for ball-screw bearing, it is made up of the component of following mass percent：Cobalt 38% ~48%, chromium 31%~41%, tungsten 16%~18%, nickel 2%~3%, graphite 2%~8%, iron and inevitable impurity member Plain total amount≤1%.
The present invention cobalt-chromium-tungsten alloy material, using cobalt, chromium, tungsten, nickel and graphite as key component, have good intensity, Wear-resistant, corrosion-resistant and thermal fatigue resistance, it disclosure satisfy that heavy water, alkalescence, radiation environment condition of work；Closed using the cobalt chromium tungsten The bearing alloying pellet of golden material, have the characteristics that corrosion-resistant, wear-resistant, precision is high and service life is long, be fully able to meet The use environment and performance requirement of ball-screw bearing in nuclear reactor loading and unloading device transmission system.
A kind of preparation method of the above-mentioned cobalt-chromium-tungsten alloy ball for ball-screw bearing, comprises the following steps：
1) raw material cobalt powder, chromium powder, tungsten powder, nichrome powder, graphite powder is taken to mix by formula, ball milling obtains compound；
2) by compound compression molding obtained by step 1), pressed compact is obtained；
3) pressed compact obtained by step 2) being subjected to vacuum-sintering under the conditions of 1200~1500 DEG C, soaking time is 40~ 90min, obtain alloying pellet base；
4) alloying pellet base obtained by step 3) is ground processing, produced.
In step 1), the ball milling refers to add hard alloy abrading-ball and acetone and carries out ball milling, and Ball-milling Time is 50~ 80h。
The ball material mass ratio of the ball milling is 3:1, the addition of acetone is to make material liquid volume ratio be 1:5.Ball material mass ratio The material powder that cobalt powder, chromium powder, tungsten powder, nichrome powder, graphite powder be mixed to form is referred to material of the material liquid volume than in.Ball The effect of mill is material powder is uniformly dispersed.
The compound that sieves to obtain is dried after ball milling.
In step 2), the pressure of the compression molding is 120~150MPa.Compression molding is entered by automatic moulding machine OK；It is pressed into the pressed compact with ball shape.
In step 3), the vacuum of the vacuum-sintering<5Pa.
In step 4), the attrition process refers to that carrying out corase grind processing, fine grinding, early grind processing and lappingout successively adds Work.
Corase grind processing abrasive material used is SiC, B4C, the combination material or SiC, Al of diadust compounding3O4, gold The combination material of hard rock micro mist compounding, lapping liquid used is machine oil；After corase grind processing, the size allowance of alloying pellet is 0.1mm, Deviation from spherical form and batch variation in diameter amount are not more than 1 μm；
The abrasive material of the fine grinding is SiC, B4C, the combination material or SiC, Al of diadust compounding3O4, Buddha's warrior attendant The combination material of stone micro mist compounding, lapping liquid used is machine oil；After fine grinding, the size allowance of alloying pellet is 0.02mm, Deviation from spherical form and batch variation in diameter amount are not more than 0.8 μm.
Wherein, the granularity of corase grind processing abrasive material used is 5~10 μm.Preferably, in corase grind processing abrasive material used, SiC、B4The mass ratio of C and diadust is (1~3):(1~3):(0.5~1.5), or SiC, Al3O4It is micro- with diamond The mass ratio of powder is (1~3):(1~3):(0.5~1.5).
The granularity of abrasive material used in fine grinding is 2~5 μm.Preferably, in the abrasive material used in fine grinding, SiC, B4C Mass ratio with diadust is (1~3):(1~3):(0.5~1.5), or SiC, Al3O4With the quality of diadust Than for (1~3):(1~3):(0.5~1.5).
In corase grind processing, processing rotating speed is 60r/min, and pressure is 2~3MPa；In fine grinding, processing rotating speed is 16r/ Min, pressure are 1~3MPa.
Early grind processing abrasive material used is SiC, B4C、Al3O4The combination material of compounding, lapping liquid used are machine Oil；After early grind processing, the size allowance of alloying pellet is 0.008mm, and deviation from spherical form and batch variation in diameter amount are not more than 0.4 μm；
Lappingout processing abrasive material used is SiC, B4C、Al3O4The combination material of compounding, lapping liquid used are machine Oil；After lappingout processing, surface roughness Ra≤0.02 μm of alloying pellet, machining accuracy reaches G10~G16.
Wherein, the granularity of early grind processing abrasive material used is 1~3 μm.Preferably, in early grind processing abrasive material used, SiC、B4C and Al3O4Mass ratio be (1~3):(1~3):(0.5~1.5).
The granularity of lappingout processing abrasive material used<1μm.Preferably, in lappingout processing abrasive material used, SiC, B4C with Al3O4Mass ratio be (1~3):(1~3):(0.5~1.5).
In early grind processing, processing rotating speed is 8r/min, and pressure is 1~2MPa；In lappingout processing, processing rotating speed is 6r/ Min, pressure are 1~2MPa.
The preparation method of the cobalt-chromium-tungsten alloy ball for ball-screw bearing of the present invention, is by each material powder mixing ball After mill, through made of compression molding, vacuum-sintering, attrition process；In gained cobalt-chromium-tungsten alloy material, cobalt, the carbide point of tungsten It is distributed in the atom such as cobalt-based body and chromium, tungsten and is solid-solution in matrix, alloy is strengthened, so as to improves the hardness of material and wear-resisting Damage performance；Gained cobalt-chromium-tungsten alloy ball, there is good intensity, wear-resistant, corrosion-resistant and thermal fatigue resistance, disclosure satisfy that core The use environment requirement of ball-screw bearing in reactor loading and unloading device transmission system.
The preparation method of the cobalt-chromium-tungsten alloy ball of the present invention, cobalt-chromium-tungsten alloy ball porosity≤0.02% of preparation, hardness >=HRC59, deviation from spherical form≤0.25 μm, surface roughness≤0.02 μm, surface accuracy reach G10~G16, disclosure satisfy that conduct The performance requirement of the ball-screw bearing of transmission mechanism and required precision.
A kind of ball-screw bearing using above-mentioned cobalt-chromium-tungsten alloy ball.The ball-screw bearing uses above-mentioned resistance to height The corrosion resistant cobalt-chromium-tungsten alloy ball of temperature, the use ring of ball-screw bearing in nuclear reactor loading and unloading device transmission system can be met Border condition, have the characteristics that corrosion-resistant, wear-resistant, precision is high, service life is long.
Embodiment
With reference to embodiment, the present invention is further illustrated.
Embodiment 1
The cobalt-chromium-tungsten alloy ball for ball-screw bearing of the present embodiment, is made up of the component of following mass percent： Cobalt 39%, chromium 36%, tungsten 18%, nickel 3%, graphite 3%, surplus are iron and inevitable impurity element.
The preparation method of the cobalt-chromium-tungsten alloy ball for ball-screw bearing of the present embodiment, comprises the following steps：
1) raw material cobalt powder, chromium powder, tungsten powder, nichrome powder, graphite powder are taken by formula, be put into ball grinding cylinder, according to ball material Mass ratio is 3:1st, solid-liquid volume ratio is 1:5 ratio adds hard alloy abrading-ball and decentralized medium acetone, is taken out after ball milling 60h And sieving is dried, obtain compound；
2) compound obtained by step 1) pressing pressure 120MPa, is obtained with circle by automatic moulding machine compression molding The pressed compact of spherical shape；
3) pressed compact obtained by step 2) is placed in sintering furnace, vacuum-sintering (vacuum is carried out under the conditions of 1450 DEG C< 5Pa), soaking time 60min, stop furnace cooling after heating and obtain alloying pellet base to room temperature；
4) alloying pellet base obtained by step 3) is ground processing, it is specific as follows：
Gained alloying pellet base is placed on steel ball lapping machine and carries out corase grind processing, during processing timing add SiC, B4C, Buddha's warrior attendant (granularity is 5~10 μm to the combination material of stone micro mist compounding, SiC, B4The mass ratio of C and diadust is 2:2:1), lapping liquid For machine oil, processing rotating speed is 60r/min, pressure 2.5MPa；Alloying pellet size allowance after corase grind processing is 0.1mm, spherical Error and batch variation in diameter amount are not more than 1 μm；
Alloying pellet after corase grind is placed on steel ball lapping machine and carries out fine grinding, during processing timing add SiC, B4C, gold (granularity is 2~5 μm to the combination material of hard rock micro mist compounding, SiC, B4The mass ratio of C and diadust is 2:2:1), grind Liquid is machine oil, and processing rotating speed is 16r/min, pressure 2MPa；Alloying pellet size allowance after fine grinding is 0.02mm, spherical Error and batch variation in diameter amount are not more than 0.8 μm；
Alloying pellet after fine grinding is placed on steel ball lapping machine progress early grind processing, during processing timing add SiC, B4C、 Al3O4(granularity is 1~3 μm to the combination material of compounding, SiC, B4C and Al3O4Mass ratio be 2:2:1), lapping liquid is machine oil, is added Work rotating speed is 8r/min, pressure 1.5MPa；Alloying pellet size allowance after early grind processing be 0.008mm, deviation from spherical form and is criticized Variation in diameter amount is not more than 0.4 μm；
Alloying pellet after early grind is placed on steel ball lapping machine progress lappingout processing, during processing timing add SiC, B4C、 Al3O4Combination material (the granularity of compounding<1 μm, SiC, B4C and Al3O4Mass ratio be 2:2:1), lapping liquid is machine oil, and processing turns Speed is 6r/min, pressure 1.5MPa；Alloying pellet surface roughness Ra≤0.02 μm after lappingout processing, machining accuracy reach G10, produce described cobalt-chromium-tungsten alloy ball.
Performance detection, the consistency ＞ of the cobalt-chromium-tungsten alloy ball are carried out to the cobalt-chromium-tungsten alloy ball obtained by the present embodiment 99.8%, hardness ＞ HRC 59, deviation from spherical form are 0.15 μm, and surface roughness is 0.015 μm, and the grade of tolerance meets that G10 levels will Ask.
Embodiment 2
The cobalt-chromium-tungsten alloy ball for ball-screw bearing of the present embodiment, is made up of the component of following mass percent： Cobalt 44%, chromium 32%, tungsten 17%, nickel 3%, graphite 3%, surplus are iron and inevitable impurity element.
The preparation method of the cobalt-chromium-tungsten alloy ball for ball-screw bearing of the present embodiment, comprises the following steps：
1) raw material cobalt powder, chromium powder, tungsten powder, nichrome powder, graphite powder are taken by formula, be put into ball grinding cylinder, according to ball material Mass ratio is 3:1st, solid-liquid volume ratio is 1:5 ratio adds hard alloy abrading-ball and decentralized medium acetone, is taken out after ball milling 60h And sieving is dried, obtain compound；
2) compound obtained by step 1) pressing pressure 120MPa, is obtained with circle by automatic moulding machine compression molding The pressed compact of spherical shape；
3) pressed compact obtained by step 2) is placed in sintering furnace, vacuum-sintering (vacuum is carried out under the conditions of 1420 DEG C< 5Pa), soaking time 60min, stop furnace cooling after heating and obtain alloying pellet base to room temperature；
4) alloying pellet base obtained by step 3) is ground processing, it is specific as follows：
Gained alloying pellet base is placed on steel ball lapping machine and carries out corase grind processing, during processing timing add SiC, B4C, Buddha's warrior attendant (granularity is 5~10 μm to the combination material of stone micro mist compounding, SiC, B4The mass ratio of C and diadust is 2:2:1), lapping liquid For machine oil, processing rotating speed is 60r/min, pressure 2.5MPa；Alloying pellet size allowance after corase grind processing is 0.1mm, spherical Error and batch variation in diameter amount are not more than 1 μm；
Alloying pellet after corase grind is placed on steel ball lapping machine and carries out fine grinding, during processing timing add SiC, B4C, gold (granularity is 2~5 μm to the combination material of hard rock micro mist compounding, SiC, B4The mass ratio of C and diadust is 2:2:1), grind Liquid is machine oil, and processing rotating speed is 16r/min, pressure 2MPa；Alloying pellet size allowance after fine grinding is 0.02mm, spherical Error and batch variation in diameter amount are not more than 0.8 μm；
Alloying pellet after fine grinding is placed on steel ball lapping machine progress early grind processing, during processing timing add SiC, B4C、 Al3O4(granularity is 1~3 μm to the combination material of compounding, SiC, B4C and Al3O4Mass ratio be 2:2:1), lapping liquid is machine oil, is added Work rotating speed is 8r/min, pressure 1.5MPa；Alloying pellet size allowance after early grind processing be 0.008mm, deviation from spherical form and is criticized Variation in diameter amount is not more than 0.4 μm；
Alloying pellet after early grind is placed on steel ball lapping machine progress lappingout processing, during processing timing add SiC, B4C、 Al3O4Combination material (the granularity of compounding<1 μm, SiC, B4C and Al3O4Mass ratio be 2:2:1), lapping liquid is machine oil, and processing turns Speed is 6r/min, pressure 1.5MPa；Alloying pellet surface roughness Ra≤0.02 μm after lappingout processing, machining accuracy reach G10, produce described cobalt-chromium-tungsten alloy ball.
Performance detection, the consistency ＞ of the cobalt-chromium-tungsten alloy ball are carried out to the cobalt-chromium-tungsten alloy ball obtained by the present embodiment 99.9%, hardness ＞ HRC 59.5, deviation from spherical form are 0.15 μm, and surface roughness is 0.015 μm, and the grade of tolerance meets G10 levels It is required that.
Embodiment 3
The cobalt-chromium-tungsten alloy ball for ball-screw bearing of the present embodiment, is made up of the component of following mass percent： Cobalt 48%, chromium 31%, tungsten 16%, nickel 2%, graphite 2.5%, surplus are iron and inevitable impurity element.
The preparation method of the cobalt-chromium-tungsten alloy ball for ball-screw bearing of the present embodiment, comprises the following steps：
1) raw material cobalt powder, chromium powder, tungsten powder, nichrome powder, graphite powder are taken by formula, be put into ball grinding cylinder, according to ball material Mass ratio is 3:1st, solid-liquid volume ratio is 1:5 ratio adds hard alloy abrading-ball and decentralized medium acetone, is taken out after ball milling 50h And sieving is dried, obtain compound；
2) compound obtained by step 1) pressing pressure 130MPa, is obtained with circle by automatic moulding machine compression molding The pressed compact of spherical shape；
3) pressed compact obtained by step 2) is placed in sintering furnace, vacuum-sintering (vacuum is carried out under the conditions of 1380 DEG C< 5Pa), soaking time 40min, stop furnace cooling after heating and obtain alloying pellet base to room temperature；
4) alloying pellet base obtained by step 3) is ground processing, it is specific as follows：
Gained alloying pellet base is placed on steel ball lapping machine and carries out corase grind processing, during processing timing add SiC, Al3O4, gold (granularity is 5~10 μm to the combination material of hard rock micro mist compounding, SiC, Al3O4Mass ratio with diadust is 2:2:1), grind Grinding fluid is machine oil, and processing rotating speed is 60r/min, pressure 2.5MPa；Alloying pellet size allowance after corase grind processing is 0.1mm, Deviation from spherical form and batch variation in diameter amount are not more than 1 μm；
Alloying pellet after corase grind is placed on steel ball lapping machine and carries out fine grinding, during processing timing add SiC, Al3O4、 (granularity is 2~5 μm to the combination material of diadust compounding, SiC, Al3O4Mass ratio with diadust is 2:2:1), grind Grinding fluid is machine oil, and processing rotating speed is 16r/min, pressure 2MPa；Alloying pellet size allowance after fine grinding is 0.02mm, ball Shape error and batch variation in diameter amount are not more than 0.8 μm；
Alloying pellet after fine grinding is placed on steel ball lapping machine progress early grind processing, during processing timing add SiC, B4C、 Al3O4(granularity is 1~3 μm to the combination material of compounding, SiC, B4C and Al3O4Mass ratio be 2:2:1), lapping liquid is machine oil, is added Work rotating speed is 8r/min, pressure 1.5MPa；Alloying pellet size allowance after early grind processing be 0.008mm, deviation from spherical form and is criticized Variation in diameter amount is not more than 0.4 μm；
Alloying pellet after early grind is placed on steel ball lapping machine progress lappingout processing, during processing timing add SiC, B4C、 Al3O4Combination material (the granularity of compounding<1 μm, SiC, B4C and Al3O4Mass ratio be 2:2:1), lapping liquid is machine oil, and processing turns Speed is 6r/min, pressure 1.5MPa；Alloying pellet surface roughness Ra≤0.02 μm after lappingout processing, machining accuracy reach G10, produce described cobalt-chromium-tungsten alloy ball.
Performance detection, the consistency ＞ of the cobalt-chromium-tungsten alloy ball are carried out to the cobalt-chromium-tungsten alloy ball obtained by the present embodiment 99%, hardness ＞ HRC 59, deviation from spherical form are 0.15 μm, and surface roughness is 0.015 μm, and the grade of tolerance meets the requirement of G10 levels.
Embodiment 4
The cobalt-chromium-tungsten alloy ball for ball-screw bearing of the present embodiment, is made up of the component of following mass percent： Cobalt 40%, chromium 33%, tungsten 16%, nickel 2.5%, graphite 8%, surplus are iron and inevitable impurity element.
The preparation method of the cobalt-chromium-tungsten alloy ball for ball-screw bearing of the present embodiment, comprises the following steps：
1) raw material cobalt powder, chromium powder, tungsten powder, nichrome powder, graphite powder are taken by formula, be put into ball grinding cylinder, according to ball material Mass ratio is 3:1st, solid-liquid volume ratio is 1:5 ratio adds hard alloy abrading-ball and decentralized medium acetone, is taken out after ball milling 80h And sieving is dried, obtain compound；
2) compound obtained by step 1) pressing pressure 140MPa, is obtained with circle by automatic moulding machine compression molding The pressed compact of spherical shape；
3) pressed compact obtained by step 2) is placed in sintering furnace, vacuum-sintering (vacuum is carried out under the conditions of 1450 DEG C< 5Pa), soaking time 80min, stop furnace cooling after heating and obtain alloying pellet base to room temperature；
4) alloying pellet base obtained by step 3) is ground processing, it is specific as follows：
Gained alloying pellet base is placed on steel ball lapping machine and carries out corase grind processing, during processing timing add SiC, Al3O4, gold (granularity is 5~10 μm to the combination material of hard rock micro mist compounding, SiC, Al3O4Mass ratio with diadust is 3:1:0.5), Lapping liquid is machine oil, and processing rotating speed is 60r/min, pressure 2.5MPa；Roughly grinding the alloying pellet size allowance after processing is 0.1mm, deviation from spherical form and batch variation in diameter amount are not more than 1 μm；
Alloying pellet after corase grind is placed on steel ball lapping machine and carries out fine grinding, during processing timing add SiC, Al3O4、 (granularity is 2~5 μm to the combination material of diadust compounding, SiC, Al3O4Mass ratio with diadust is 3:1:0.5), Lapping liquid is machine oil, and processing rotating speed is 16r/min, pressure 2MPa；Alloying pellet size allowance after fine grinding is 0.02mm, Deviation from spherical form and batch variation in diameter amount are not more than 0.8 μm；
Alloying pellet after fine grinding is placed on steel ball lapping machine progress early grind processing, during processing timing add SiC, B4C、 Al3O4(granularity is 1~3 μm to the combination material of compounding, SiC, B4C and Al3O4Mass ratio be 1:3:1.5), lapping liquid is machine oil, Processing rotating speed is 8r/min, pressure 1.5MPa；Alloying pellet size allowance after early grind processing be 0.008mm, deviation from spherical form with Criticize variation in diameter amount and be not more than 0.4 μm；
Alloying pellet after early grind is placed on steel ball lapping machine progress lappingout processing, during processing timing add SiC, B4C、 Al3O4Combination material (the granularity of compounding<1 μm, SiC, B4C and Al3O4Mass ratio be 1:3:1.5), lapping liquid is machine oil, processing Rotating speed is 6r/min, pressure 1.5MPa；Alloying pellet surface roughness Ra≤0.02 μm after lappingout processing, machining accuracy reach G10, produce described cobalt-chromium-tungsten alloy ball.
Performance detection, the consistency ＞ of the cobalt-chromium-tungsten alloy ball are carried out to the cobalt-chromium-tungsten alloy ball obtained by the present embodiment 99%, hardness ＞ HRC 60, deviation from spherical form are 0.15 μm, and surface roughness is 0.015 μm, and the grade of tolerance meets the requirement of G10 levels.
Embodiment 5
The cobalt-chromium-tungsten alloy ball for ball-screw bearing of the present embodiment, is made up of the component of following mass percent： Cobalt 38%, chromium 41%, tungsten 16.5%, nickel 2%, graphite 2%, surplus are iron and inevitable impurity element.
The preparation method of the cobalt-chromium-tungsten alloy ball for ball-screw bearing of the present embodiment, comprises the following steps：
1) raw material cobalt powder, chromium powder, tungsten powder, nichrome powder, graphite powder are taken by formula, be put into ball grinding cylinder, according to ball material Mass ratio is 3:1st, solid-liquid volume ratio is 1:5 ratio adds hard alloy abrading-ball and decentralized medium acetone, is taken out after ball milling 70h And sieving is dried, obtain compound；
2) compound obtained by step 1) pressing pressure 150MPa, is obtained with circle by automatic moulding machine compression molding The pressed compact of spherical shape；
3) pressed compact obtained by step 2) is placed in sintering furnace, vacuum-sintering (vacuum is carried out under the conditions of 1465 DEG C< 5Pa), soaking time 90min, stop furnace cooling after heating and obtain alloying pellet base to room temperature；
4) alloying pellet base obtained by step 3) is ground processing, it is specific as follows：
Gained alloying pellet base is placed on steel ball lapping machine and carries out corase grind processing, during processing timing add SiC, Al3O4, gold (granularity is 5~10 μm to the combination material of hard rock micro mist compounding, SiC, Al3O4Mass ratio with diadust is 2:3:1.5), Lapping liquid is machine oil, and processing rotating speed is 60r/min, pressure 2.5MPa；Roughly grinding the alloying pellet size allowance after processing is 0.1mm, deviation from spherical form and batch variation in diameter amount are not more than 1 μm；
Alloying pellet after corase grind is placed on steel ball lapping machine and carries out fine grinding, during processing timing add SiC, Al3O4、 (granularity is 2~5 μm to the combination material of diadust compounding, SiC, Al3O4Mass ratio with diadust is 2:3:1.5), Lapping liquid is machine oil, and processing rotating speed is 16r/min, pressure 2MPa；Alloying pellet size allowance after fine grinding is 0.02mm, Deviation from spherical form and batch variation in diameter amount are not more than 0.8 μm；
Alloying pellet after fine grinding is placed on steel ball lapping machine progress early grind processing, during processing timing add SiC, B4C、 Al3O4(granularity is 1~3 μm to the combination material of compounding, SiC, B4C and Al3O4Mass ratio be 3:2:0.5), lapping liquid is machine oil, Processing rotating speed is 8r/min, pressure 1.5MPa；Alloying pellet size allowance after early grind processing be 0.008mm, deviation from spherical form with Criticize variation in diameter amount and be not more than 0.4 μm；
Alloying pellet after early grind is placed on steel ball lapping machine progress lappingout processing, during processing timing add SiC, B4C、 Al3O4Combination material (the granularity of compounding<1 μm, SiC, B4C and Al3O4Mass ratio be 3:2:0.5), lapping liquid is machine oil, processing Rotating speed is 6r/min, pressure 1.5MPa；Alloying pellet surface roughness Ra≤0.02 μm after lappingout processing, machining accuracy reach G10, produce described cobalt-chromium-tungsten alloy ball.
Performance detection, the consistency ＞ of the cobalt-chromium-tungsten alloy ball are carried out to the cobalt-chromium-tungsten alloy ball obtained by the present embodiment 98.5%, hardness ＞ HRC 60, deviation from spherical form are 0.15 μm, and surface roughness is 0.015 μm, and the grade of tolerance meets that G10 levels will Ask.

Claims (10)

  1. A kind of 1. cobalt-chromium-tungsten alloy material, it is characterised in that：It is made up of the component of following mass percent：Cobalt 38%~48%, chromium 31%~41%, tungsten 16%~18%, nickel 2%~3%, graphite 2%~8%, iron and inevitable impurity element total amount≤1%.
  2. A kind of 2. cobalt-chromium-tungsten alloy ball for ball-screw bearing, it is characterised in that：By the component system of following mass percent Into：Cobalt 38%~48%, chromium 31%~41%, tungsten 16%~18%, nickel 2%~3%, graphite 2%~8%, iron and inevitable impurity member Plain total amount≤1%.
  3. 3. a kind of preparation method of the cobalt-chromium-tungsten alloy ball as claimed in claim 2 for ball-screw bearing, its feature exist In：Comprise the following steps：
    1）Raw material cobalt powder, chromium powder, tungsten powder, nichrome powder, graphite powder mixing are taken by formula, ball milling obtains compound；
    2）By step 1）Gained compound compression molding, obtains pressed compact；
    3）By step 2）Gained pressed compact carries out vacuum-sintering under the conditions of 1200~1500 DEG C, and soaking time is 40~90min, is obtained Alloying pellet base；
    4）By step 3）Gained alloying pellet base is ground processing, produces.
  4. 4. the preparation method of the cobalt-chromium-tungsten alloy ball according to claim 3 for ball-screw bearing, it is characterised in that： Step 1）In, the ball milling refers to that adding hard alloy abrading-ball and acetone carries out ball milling, and Ball-milling Time is 50~80h.
  5. 5. the preparation method of the cobalt-chromium-tungsten alloy ball according to claim 4 for ball-screw bearing, it is characterised in that： The ball material mass ratio of the ball milling is 3:1, the addition of acetone is to make material liquid volume ratio be 1:5.
  6. 6. the preparation method of the cobalt-chromium-tungsten alloy ball according to claim 3 for ball-screw bearing, it is characterised in that： Step 2）In, the pressure of the compression molding is 120~150MPa.
  7. 7. the preparation method of the cobalt-chromium-tungsten alloy ball according to claim 3 for ball-screw bearing, it is characterised in that： Step 4）In, the attrition process refers to carry out corase grind processing, fine grinding, early grind processing and lappingout processing successively.
  8. 8. the preparation method of the cobalt-chromium-tungsten alloy ball according to claim 7 for ball-screw bearing, it is characterised in that： Corase grind processing abrasive material used is SiC, B4C, the combination material or SiC, Al of diadust compounding3O4, diadust The combination material of compounding, lapping liquid used are machine oil；After corase grind processing, the size allowance of alloying pellet is 0.1mm, deviation from spherical form It is not more than 1 μm with batch variation in diameter amount；
    The abrasive material of the fine grinding is SiC, B4C, the combination material or SiC, Al of diadust compounding3O4, diamond it is micro- The combination material of powder compounding, lapping liquid used is machine oil；After fine grinding, the size allowance of alloying pellet is 0.02mm, spherical Error and batch variation in diameter amount are not more than 0.8 μm.
  9. 9. the preparation method of the cobalt-chromium-tungsten alloy ball for ball-screw bearing according to claim 7 or 8, its feature exist In：Early grind processing abrasive material used is SiC, B4C、Al3O4The combination material of compounding, lapping liquid used are machine oil；Early grind After processing, the size allowance of alloying pellet is 0.008mm, and deviation from spherical form and batch variation in diameter amount are not more than 0.4 μm；
    Lappingout processing abrasive material used is SiC, B4C、Al3O4The combination material of compounding, lapping liquid used are machine oil；Essence After grinding processing, surface roughness Ra≤0.02 μm of alloying pellet, machining accuracy reaches G10~G16.
  10. A kind of 10. ball-screw bearing using cobalt-chromium-tungsten alloy ball as claimed in claim 2.
CN201610617279.7A 2016-07-28 2016-07-28 A kind of cobalt-chromium-tungsten alloy material, cobalt-chromium-tungsten alloy ball for ball-screw bearing and preparation method thereof, ball-screw bearing Active CN106119662B (en)

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