CN108823523B - Method for modifying surface of tapered roller by using special tool for chemical heat treatment of tapered roller - Google Patents

Method for modifying surface of tapered roller by using special tool for chemical heat treatment of tapered roller Download PDF

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Publication number
CN108823523B
CN108823523B CN201810767906.4A CN201810767906A CN108823523B CN 108823523 B CN108823523 B CN 108823523B CN 201810767906 A CN201810767906 A CN 201810767906A CN 108823523 B CN108823523 B CN 108823523B
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tapered roller
furnace
heat treatment
tapered
chemical heat
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CN108823523A (en
Inventor
周淑梅
孙振淋
王大勇
安敏
袁超
夏云志
付中元
吴玉成
穆强
王玮錡
于遨海
于祎航
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AVIC Harbin Bearing Co Ltd
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AVIC Harbin Bearing Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces

Abstract

A method for modifying the surface of a tapered roller by using a special tool for the chemical heat treatment of the tapered roller relates to a method for modifying the surface of the tapered roller. The invention aims to solve the problems that when the conventional tool is used for modifying the tapered roller, the tapered roller is arranged densely, the full flow of atmosphere is influenced, the contact surface between the tapered roller and the tool is too large, and the seepage layer is not uniform and the seepage layer of the tapered roller in the same batch is not uniform. The method comprises the following steps: firstly, processing an edge-shaped bracket by using a steel material; secondly, assembling a special tool for the chemical heat treatment of the tapered roller; thirdly, placing a plurality of tapered rollers on the special tool for the chemical heat treatment of the tapered rollers; and fourthly, carrying out surface modification on the plurality of tapered rollers on the special tool for the chemical heat treatment of the tapered rollers by utilizing surface modification equipment to obtain the tapered rollers after the surface modification. The invention is suitable for modifying the surface of the tapered roller.

Description

Method for modifying surface of tapered roller by using special tool for chemical heat treatment of tapered roller
Technical Field
The invention relates to a method for modifying the surface of a tapered roller.
Background
The bearing component is an indispensable universal standardized part of mechanical equipment, has a wide application range and has huge social demand. The mechanical property of a bearing part needs to reach the standard, but due to the technical limitation of a tool, the surface modification of the rolling element tapered roller of the rolling bearing at present cannot meet the technical requirement, so that the surface modification of the tapered roller is not applied, wherein the problems existing when the tapered roller is subjected to nitriding treatment are specifically as follows:
(1) the conical rollers are arranged densely, so that the full flow of atmosphere is influenced, and the surface modification of the shielding surface is insufficient;
(2) contact surfaces between the tapered roller and the tool are too large, so that the same tapered roller has uneven seeping layers;
(3) the depth of the charging basket is at least several times of the diameter (large end surface) of the tapered roller, so that the surface modification effect of the tapered roller near the basket wall is influenced, and the non-uniformity of the infiltration layer of the tapered roller in the same batch is caused;
the problems in carburizing or cyaniding the tapered roller are specifically as follows:
(1) the conical rollers are arranged densely, so that the full flow of atmosphere is influenced, and the carburization or cyanidation of the shielding surface is insufficient;
(2) contact surfaces between the tapered roller and the tool are too large, so that the same tapered roller has uneven seeping layers;
(3) the depth of the charging basket is at least several times of the diameter (large end face) of the tapered roller, the carburizing or cyaniding effect of the tapered roller near the basket wall is influenced, and the carburized layer of the tapered roller in the same batch is uneven.
Disclosure of Invention
The invention aims to solve the problems that when the conventional tool is used for modifying the tapered roller, the tapered roller is placed densely, the full flow of atmosphere is influenced, the contact surface between the tapered roller and the tool is too large, so that the seepage layer is not uniform and the seepage layer of the tapered roller in the same batch is not uniform, and provides a method for modifying the surface of the tapered roller by using the tool special for the chemical heat treatment of the tapered roller.
A method for modifying the surface of a tapered roller by using a special tool for the chemical heat treatment of the tapered roller is completed according to the following steps:
firstly, processing an edge-shaped bracket by using a steel material;
the section of the blade-shaped bracket in the first step is an obtuse triangle;
secondly, arranging two edge-shaped supports in parallel in a working area of the surface modification equipment, arranging the cutting edges of the two edge-shaped supports oppositely, wherein the opposite cutting edge surfaces in the two edge-shaped supports are inclined planes, and the included angle between the inclined planes and the horizontal plane is α degrees or less and is equal to or less than 90 degrees;
placing a plurality of tapered rollers on the special tool for the chemical heat treatment of the tapered rollers, wherein the distance between every two tapered rollers is not less than 30 mm;
fourthly, carrying out surface modification on a plurality of tapered rollers on the special tool for the chemical heat treatment of the tapered rollers by utilizing surface modification equipment to obtain the tapered rollers after the surface modification, namely completing the method for modifying the surfaces of the tapered rollers by utilizing the special tool for the chemical heat treatment of the tapered rollers;
the surface modification in the fourth step is nitriding treatment, carburizing treatment or cyaniding treatment.
The invention has the beneficial effects that:
although the tapered roller and the edge-shaped bracket are still in point contact, the edge of the edge-shaped bracket is sharp and small, and active carbon, carbon and nitrogen atoms infiltrated around the contact point are quickly diffused to the position of the contact point due to the concentration gradient of the carbon, the carbon and the nitrogen, so that the problem of the consistency of a carburized layer in the carburizing or cyaniding process of the contact point is solved;
secondly, by adopting the method of the invention, although the tapered roller and the edge-shaped bracket are still in point contact, because the cutting edge of the edge-shaped bracket is sharp and the contact point is small, active nitrogen atoms infiltrated around the contact point are quickly diffused to the position of the contact point due to the nitrogen concentration gradient, and the problem of infiltration layer consistency in the nitridation process of the contact point is ensured;
the surface of the tapered roller is modified by adopting the special tool for the chemical heat treatment of the tapered roller, so that the shielding effect of a geometric space of the tapered roller to be infiltrated is reduced, the sufficient flowing of a carburizing or cyaniding atmosphere is ensured, the tapered roller is fully contacted with the carburizing or cyaniding atmosphere, and the depth of an infiltrated layer of the modified tapered roller is ensured to be uniform;
fourthly, the surface of the tapered roller is modified by adopting the special tool for the chemical heat treatment of the tapered roller, so that the shielding effect of the geometric space of the tapered roller to be treated is reduced, the sufficient flowing of the nitriding atmosphere is ensured, the tapered roller is fully contacted with the nitriding atmosphere, and the uniform depth of the nitrided layer of the modified tapered roller is ensured;
fifthly, the tapered roller is nitrided by using a special tool for the chemical heat treatment of the tapered roller, the penetration layer of the tapered roller is 0.1-0.14 mm, and the nitriding uniformity is +/-0.02 mm;
sixthly, the invention utilizes the special tool for the chemical heat treatment of the tapered roller to carry out carburizing treatment or cyaniding treatment on the tapered roller, the penetrated layer of the tapered roller is 0.9 mm-1 mm, and the uniformity of the penetrated layer is +/-0.05 mm.
The invention is suitable for modifying the surface of the tapered roller.
Drawings
FIG. 1 is a front view of a blade support as described in step one of the embodiments;
FIG. 2 is a top view of the knife edge bracket as set forth in step one of the embodiment;
fig. 3 is a front view of two tapered rollers placed on a tool dedicated for chemical heat treatment of tapered rollers in a third step of the embodiment, where 1 is a blade-shaped bracket, and 2 is a tapered roller;
fig. 4 is a top view of two tapered rollers placed on a tool dedicated to chemical heat treatment of tapered rollers in step three of the embodiment.
Detailed Description
The first embodiment is as follows: the embodiment is a method for modifying the surface of a tapered roller by using a special tool for the chemical heat treatment of the tapered roller, which is completed by the following steps:
firstly, processing an edge-shaped bracket by using a steel material;
the section of the blade-shaped bracket in the first step is an obtuse triangle;
secondly, arranging two edge-shaped supports in parallel in a working area of the surface modification equipment, arranging the cutting edges of the two edge-shaped supports oppositely, wherein the opposite cutting edge surfaces in the two edge-shaped supports are inclined planes, and the included angle between the inclined planes and the horizontal plane is α degrees or less and is equal to or less than 90 degrees;
placing a plurality of tapered rollers on the special tool for the chemical heat treatment of the tapered rollers, wherein the distance between every two tapered rollers is not less than 30 mm;
fourthly, carrying out surface modification on a plurality of tapered rollers on the special tool for the chemical heat treatment of the tapered rollers by utilizing surface modification equipment to obtain the tapered rollers after the surface modification, namely completing the method for modifying the surfaces of the tapered rollers by utilizing the special tool for the chemical heat treatment of the tapered rollers;
the surface modification in the fourth step is nitriding treatment, carburizing treatment or cyaniding treatment.
The beneficial effects of the embodiment are as follows:
although the tapered roller and the edge-shaped bracket are still in point contact by adopting the method of the embodiment, because the cutting edge of the edge-shaped bracket is sharp and the contact point is small, activated carbon, carbon and nitrogen atoms infiltrated around the contact point are quickly diffused to the position of the contact point due to the concentration gradient of the carbon, the carbon and the nitrogen, and the problem of the consistency of a carburized layer in the carburizing or cyaniding process of the contact point is solved;
secondly, by adopting the method of the embodiment, although the tapered roller and the edge-shaped bracket are still in point contact, because the cutting edge of the edge-shaped bracket is sharp and the contact point is small, active nitrogen atoms infiltrated around the contact point are quickly diffused to the position of the contact point due to the nitrogen concentration gradient, and the problem of infiltration layer consistency in the nitridation process of the contact point is ensured;
the surface of the tapered roller is modified by adopting the special tool for the chemical heat treatment of the tapered roller, so that the shielding effect of a geometric space of the tapered roller to be infiltrated is reduced, the sufficient flowing of a carburizing or cyaniding atmosphere is ensured, the tapered roller is fully contacted with the carburizing/cyaniding atmosphere, and the depth of an infiltrated layer of the modified tapered roller is ensured to be uniform;
the surface of the tapered roller is modified by adopting the special tool for the chemical heat treatment of the tapered roller, so that the shielding effect of the geometric space of the tapered roller to be treated is reduced, the sufficient flowing of the nitriding atmosphere is ensured, the tapered roller is fully contacted with the nitriding atmosphere, and the depth of a nitride layer of the modified tapered roller is ensured to be uniform;
fifthly, the tapered roller is nitrided by the special tool for the chemical heat treatment of the tapered roller, the penetration layer of the tapered roller is 0.1 mm-0.14 mm, and the nitriding uniformity is +/-0.02 mm;
sixthly, the special tool for the chemical heat treatment of the tapered roller is utilized to carry out carburizing treatment or cyaniding treatment on the tapered roller, the penetrated layer of the tapered roller is 0.9 mm-1 mm, and the uniformity of the penetrated layer is +/-0.05 mm.
The present embodiment is suitable for modifying the surface of a tapered roller.
The second embodiment is as follows: the present embodiment differs from the present embodiment in that: and in the second step, the conical roller is placed between the two edge-shaped supports, and the conical roller is in point contact with the cutting edges of the two edge-shaped supports. Other steps are the same as in the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the distance between every two tapered rollers in the third step is 30 mm-100 mm. The other steps are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment and one of the first to third embodiments is as follows: the distance between every two tapered rollers in the third step is 30 mm-50 mm. The other steps are the same as those in the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the nitridation treatment process in the fourth step is as follows: the surface modification equipment used for the nitriding treatment is a gas nitriding furnace, ammonia gas is firstly introduced into the gas nitriding furnace at the temperature of below 150 ℃, the gas nitriding furnace is exhausted, and the volume content of the ammonia gas in the gas nitriding furnace reaches 90 percent or the ammonia gas is introduced into the gas nitriding furnace for 25-35 min; and then heating the gas nitriding furnace to 500-520 ℃ in the ammonia atmosphere, preserving the heat for 50-60 h under the ammonia atmosphere and at the temperature of 500-520 ℃, cooling to below 150 ℃ along with the furnace, and discharging to finish the nitriding treatment. The other steps are the same as those in the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is as follows: the carburizing process described in the fourth step is as follows: the surface modification equipment used for the carburizing treatment is an Ipsen vacuum carburizing furnace, nitrogen is firstly introduced into the Ipsen vacuum carburizing furnace, the Ipsen vacuum carburizing furnace is heated to 740-760 ℃ under the nitrogen atmosphere, then the temperature is kept for 25-35 min under the nitrogen atmosphere and the temperature of 740-760 ℃, then the Ipsen vacuum carburizing furnace is heated to 890-910 ℃, acetylene gas is introduced into the Ipsen vacuum carburizing furnace, the flow rate of the acetylene gas is 1000L/h, then the temperature is kept for 4-6 h under the condition of the acetylene atmosphere and the temperature of 890-910 ℃, and then the furnace is cooled to below 60 ℃ along with the furnace to be taken out, thus completing the carburizing treatment. The other steps are the same as those in the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: the cyanidation process described in step four is as follows: the surface modification equipment used for cyaniding is a shaft furnace, firstly kerosene and ammonia gas are introduced into the shaft furnace, the introduction amount of the kerosene is 10mL/min, the furnace pressure in the shaft furnace is 0.1MPa, the shaft furnace is heated to 830-850 ℃ from room temperature under the atmosphere of the ammonia gas, then the temperature is kept for 4-5 h under the atmosphere of the ammonia gas and at the temperature of 830-850 ℃, and then the shaft furnace is cooled to below 150 ℃ along with the furnace and taken out of the furnace, thus completing the cyaniding. The other steps are the same as those in the first to sixth embodiments.
The specific implementation mode is eight: the difference between this embodiment and one of the first to seventh embodiments is: when the surface modification in the fourth step is nitriding treatment, the steel material in the first step is one or more of GCr15, GCr15SiMn, 38CrMoAl, 35Cr2Ni4MoA, 32Cr3MoE, M50 and M50 NiL. The other steps are the same as those in the first to seventh embodiments.
The specific implementation method nine: the difference between this embodiment and the first to eighth embodiments is: when the surface modification in the fourth step is carburizing treatment, the steel material in the first step is one or more of Cr4Mo4V, W9Cr4V2Mo, W18Cr4V, W6Mo5Cr4V2, Cr25Ni20Si, M50 and M50 NiL. The other steps are the same as those in the first to eighth embodiments.
The detailed implementation mode is ten: the difference between this embodiment and one of the first to ninth embodiments is as follows: when the surface modification in the fourth step is cyanidation, the steel material in the first step is one or more of Cr4Mo4V, W9Cr4V2Mo, W18Cr4V, W6Mo5Cr4V2, Cr25Ni20Si, M50 and M50 NiL. The other steps are the same as those in the first to ninth embodiments.
The following examples were used to demonstrate the beneficial effects of the present invention:
the first embodiment is as follows: a method for modifying the surface of a tapered roller by using a special tool for the chemical heat treatment of the tapered roller is completed according to the following steps:
firstly, processing an edge-shaped bracket by using a steel material;
the steel material in the first step is GCr 15;
the section of the blade-shaped bracket in the first step is an obtuse triangle; the three angles of the obtuse triangle are 45 degrees, 120 degrees and 15 degrees respectively;
secondly, arranging two edge-shaped supports in parallel in a working area of the surface modification equipment, arranging the cutting edges of the two edge-shaped supports oppositely, wherein the opposite cutting edge surfaces in the two edge-shaped supports are inclined planes, and the included angle between the inclined planes and the horizontal plane is α degrees;
placing the two tapered rollers on a special tool for the chemical heat treatment of the tapered rollers, wherein the distance between the two tapered rollers is 50 mm;
surface modification is carried out on the two tapered rollers on the tool special for the chemical heat treatment of the tapered rollers by utilizing surface modification equipment to obtain the tapered rollers after the surface modification, namely, the method for modifying the surfaces of the tapered rollers by utilizing the tool special for the chemical heat treatment of the tapered rollers is completed;
the surface modification in the fourth step is nitriding treatment, and the nitriding treatment process comprises the following steps: the surface modification equipment used for the nitriding treatment is a gas nitriding furnace, ammonia gas is firstly introduced into the gas nitriding furnace at room temperature, the gas nitriding furnace is exhausted, the ammonia gas is introduced into the gas nitriding furnace for 30min, the temperature of the gas nitriding furnace is raised to 510 ℃ under the atmosphere of the ammonia gas, the temperature is kept for 55h under the atmosphere of the ammonia gas and at the temperature of 510 ℃, and then the gas nitriding furnace is cooled to below 150 ℃ along with the furnace and taken out of the furnace, so that the nitriding treatment is completed.
In the third step of the embodiment, the material of the tapered roller is W9Cr4V2 Mo.
In the first embodiment, the permeating layer uniformity of the tapered roller after surface modification is +/-0.02 mm, and the permeating layer uniformity is better.
FIG. 1 is a front view of a blade support as described in step one of the embodiments;
α is 60 ° and β is 45 ° in fig. 1.
FIG. 2 is a top view of the knife edge bracket as set forth in step one of the embodiment;
fig. 3 is a front view of two tapered rollers placed on a tool dedicated for chemical heat treatment of tapered rollers in a third step of the embodiment, where 1 is a blade-shaped bracket, and 2 is a tapered roller;
fig. 4 is a top view of two tapered rollers placed on a tool dedicated to chemical heat treatment of tapered rollers in step three of the embodiment.

Claims (10)

1. A method for modifying the surface of a tapered roller by using a special tool for the chemical heat treatment of the tapered roller is characterized by comprising the following steps:
firstly, processing an edge-shaped bracket by using a steel material;
the section of the blade-shaped bracket in the first step is an obtuse triangle;
secondly, arranging two edge-shaped supports in parallel in a working area of the surface modification equipment, arranging the cutting edges of the two edge-shaped supports oppositely, wherein the opposite cutting edge surfaces in the two edge-shaped supports are inclined planes, and the included angle between the inclined planes and the horizontal plane is α degrees or less and is equal to or less than 90 degrees;
placing a plurality of tapered rollers on the special tool for the chemical heat treatment of the tapered rollers, wherein the distance between every two tapered rollers is not less than 30 mm;
fourthly, carrying out surface modification on a plurality of tapered rollers on the special tool for the chemical heat treatment of the tapered rollers by utilizing surface modification equipment to obtain the tapered rollers after the surface modification, namely completing the method for modifying the surfaces of the tapered rollers by utilizing the special tool for the chemical heat treatment of the tapered rollers;
the surface modification in the fourth step is nitriding treatment, carburizing treatment or cyaniding treatment.
2. The method for modifying the surface of the tapered roller by using the tool special for the chemical heat treatment of the tapered roller as claimed in claim 1, wherein in the second step, the tapered roller is placed between the two edge-type brackets, and the contact mode between the tapered roller and the cutting edges of the two edge-type brackets is point contact.
3. The method for modifying the surface of the tapered roller by using the tool special for the chemical heat treatment of the tapered roller as claimed in claim 1, wherein the distance between every two tapered rollers in the third step is 30mm to 100 mm.
4. The method for modifying the surface of the tapered roller by using the tool special for the chemical heat treatment of the tapered roller as claimed in claim 1 or 3, wherein the distance between every two tapered rollers in the third step is 30mm to 50 mm.
5. The method for modifying the surface of the tapered roller by using the tool special for the chemical heat treatment of the tapered roller as claimed in claim 1, wherein the nitriding treatment process in the fourth step is as follows: the surface modification equipment used for the nitriding treatment is a gas nitriding furnace, ammonia gas is firstly introduced into the gas nitriding furnace at the temperature of below 150 ℃, the gas nitriding furnace is exhausted, and the volume content of the ammonia gas in the gas nitriding furnace reaches 90 percent or the ammonia gas is introduced into the gas nitriding furnace for 25-35 min; and then heating the gas nitriding furnace to 500-520 ℃ in the ammonia atmosphere, preserving the heat for 50-60 h under the ammonia atmosphere and at the temperature of 500-520 ℃, cooling to below 150 ℃ along with the furnace, and discharging to finish the nitriding treatment.
6. The method for modifying the surface of the tapered roller by using the tool special for the chemical heat treatment of the tapered roller according to claim 1, wherein the carburizing treatment in the fourth step is performed by the following steps: the surface modification equipment used for the carburizing treatment is an Ipsen vacuum carburizing furnace, nitrogen is firstly introduced into the Ipsen vacuum carburizing furnace, the Ipsen vacuum carburizing furnace is heated to 740-760 ℃ under the nitrogen atmosphere, then the temperature is kept for 25-35 min under the nitrogen atmosphere and the temperature of 740-760 ℃, then the Ipsen vacuum carburizing furnace is heated to 890-910 ℃, acetylene gas is introduced into the Ipsen vacuum carburizing furnace, the flow rate of the acetylene gas is 1000L/h, then the temperature is kept for 4-6 h under the condition of the acetylene atmosphere and the temperature of 890-910 ℃, and then the furnace is cooled to below 60 ℃ along with the furnace to be taken out, thus completing the carburizing treatment.
7. The method for modifying the surface of the tapered roller by using the tool special for the chemical heat treatment of the tapered roller according to claim 1, wherein the cyanidation treatment process in the fourth step is as follows: the surface modification equipment used for cyaniding is a shaft furnace, firstly kerosene and ammonia gas are introduced into the shaft furnace, the introduction amount of the kerosene is 10mL/min, the furnace pressure in the shaft furnace is 0.1MPa, the shaft furnace is heated to 830-850 ℃ from room temperature under the atmosphere of the ammonia gas, then the temperature is kept for 4-5 h under the atmosphere of the ammonia gas and at the temperature of 830-850 ℃, and then the shaft furnace is cooled to below 150 ℃ along with the furnace and taken out of the furnace, thus completing the cyaniding.
8. The method for modifying the surface of the tapered roller by using the tool special for the chemical heat treatment of the tapered roller as claimed in claim 1, wherein when the surface modification in the fourth step is nitriding, the steel material in the first step is one or more of GCr15, GCr15SiMn, 38CrMoAl, 35Cr2Ni4MoA, 32Cr3MoE, M50 and M50 NiL.
9. The method for modifying the surface of the tapered roller by using the tool special for the chemical heat treatment of the tapered roller as claimed in claim 1, wherein when the surface modification in the fourth step is carburizing treatment, the steel material in the first step is one or more of Cr4Mo4V, W9Cr4V2Mo, W18Cr4V, W6Mo5Cr4V2, Cr25Ni20Si, M50 and M50 NiL.
10. The method for modifying the surface of the tapered roller by using the tool special for the chemical heat treatment of the tapered roller as claimed in claim 1, wherein when the surface modification in the fourth step is cyanidation, the steel material in the first step is one or more of Cr4Mo4V, W9Cr4V2Mo, W18Cr4V, W6Mo5Cr4V2, Cr25Ni20Si, M50 and M50 NiL.
CN201810767906.4A 2018-07-12 2018-07-12 Method for modifying surface of tapered roller by using special tool for chemical heat treatment of tapered roller Active CN108823523B (en)

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CN201810767906.4A CN108823523B (en) 2018-07-12 2018-07-12 Method for modifying surface of tapered roller by using special tool for chemical heat treatment of tapered roller

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Application Number Priority Date Filing Date Title
CN201810767906.4A CN108823523B (en) 2018-07-12 2018-07-12 Method for modifying surface of tapered roller by using special tool for chemical heat treatment of tapered roller

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CN108823523A CN108823523A (en) 2018-11-16
CN108823523B true CN108823523B (en) 2020-05-22

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