CN113046524A - Heat treatment process for traction ring - Google Patents
Heat treatment process for traction ring Download PDFInfo
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- CN113046524A CN113046524A CN202110254290.2A CN202110254290A CN113046524A CN 113046524 A CN113046524 A CN 113046524A CN 202110254290 A CN202110254290 A CN 202110254290A CN 113046524 A CN113046524 A CN 113046524A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000008569 process Effects 0.000 title claims abstract description 29
- 238000000137 annealing Methods 0.000 claims abstract description 10
- 238000010791 quenching Methods 0.000 claims abstract description 8
- 230000000171 quenching effect Effects 0.000 claims abstract description 8
- 238000005496 tempering Methods 0.000 claims abstract description 6
- 230000035882 stress Effects 0.000 claims description 16
- 230000032683 aging Effects 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 241000221535 Pucciniales Species 0.000 claims description 2
- 229910001566 austenite Inorganic materials 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 229910000734 martensite Inorganic materials 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 208000004350 Strabismus Diseases 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/58—Oils
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a heat treatment process for a traction ring, relates to the field of heat treatment processing, and aims to solve the problems that a workpiece obtained by heat treatment in the prior art is short in service life and is easy to deform in the heat treatment process, and the technical scheme is as follows: the heat treatment process comprises the following steps: step 1: preparing a workpiece, and checking the geometric shape of the traction ring to ensure that the surface of the traction ring is free from burrs, cracks, scratches and rusty spots; step 2: designing a positioning tool; and step 3: assembling, namely sequentially assembling a plurality of traction rings obtained in the step 1 on the positioning tool obtained in the step 2; and 4, step 4: quenching; and 5: tempering; step 6: and (6) annealing. In the heat treatment process, the traction ring is not easy to deform, and the traction ring obtained by the heat treatment process has the advantages of high hardness, strong wear resistance and long service life.
Description
Technical Field
The invention relates to the field of heat treatment processing, in particular to a heat treatment process for a traction ring.
Background
The transmission device of the bicycle and the electric vehicle generally adopts chain transmission, and has the advantages of high reliability and simple transmission structure. Most of the popular bicycles in recent years have the functions of shifting gears and changing speed, so that the bicycles are convenient to adapt to the requirements of drivers of different ages and power transmission under different road conditions, and the bicycles with higher gears have more gears. However, for chain transmission, the impact load is large in the transmission process, noise is easily generated under the condition that gear shifting lubrication is insufficient through chain transmission, jerking can be generated to influence riding experience, and backward slipping is easily generated when power is insufficient on an uphill slope to cause potential safety hazards.
Therefore, a new solution is needed to solve this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a heat treatment process for a traction ring, wherein the traction ring is not easy to deform in the heat treatment process, and the traction ring obtained by the heat treatment process has the advantages of high hardness, strong wear resistance and long service life.
The technical purpose of the invention is realized by the following technical scheme: a heat treatment process for a traction ring, the traction ring including ratchet teeth provided on one end surface thereof and key grooves provided on an inner side wall thereof, the heat treatment process comprising the steps of:
step 1: preparing a workpiece, and checking the geometric shape of the traction ring to ensure that the surface of the traction ring is free from burrs, cracks, scratches and rusty spots;
step 2: designing a positioning tool, designing the positioning tool matched with the traction ring according to the characteristics of the geometric shape of the traction ring, requiring that batch processing can be realized in the heat treatment process, and ensuring that the traction ring cannot deform in the heating process;
and step 3: assembling, namely sequentially assembling a plurality of traction rings obtained in the step 1 on the positioning tool obtained in the step 2;
and 4, step 4: quenching, namely when the temperature of the heat treatment furnace reaches 630 ℃, hoisting the positioning tool and the traction ring in the step 3 into the heat treatment furnace, continuously heating to 640 ℃, keeping the temperature for a period of time at 640 ℃, continuously heating to 720-740 ℃, and then immediately taking out the positioning tool and the traction ring, putting the positioning tool and the traction ring into a cold oil medium, and cooling to room temperature;
and 5: tempering, cooling the traction ring in the step 4 for 3 hours, putting the traction ring into a heat treatment furnace again, heating the traction ring to 140-150 ℃, and preserving heat for 3 hours at the temperature of 140-150 ℃;
step 6: and (4) annealing, namely cooling the heat treatment furnace in the step (5) to 110-120 ℃ for long-time low-temperature artificial aging treatment, and performing stress annealing treatment on the surface of the traction ring at the temperature of 110-120 ℃.
By adopting the technical scheme, the traction ring is not easy to deform in the heat treatment process, and the traction ring obtained by the heat treatment process has the advantages of high hardness, strong wear resistance and long service life.
The invention is further configured to: the location frock includes annular base, fixedly connected with is used for supporting a plurality of support columns of pulling the intra-annular perisporium on the annular base, and is a plurality of the support column encircles and forms the ring setting, the one end that annular base was kept away from to the support column can be dismantled through detachable construction and be connected with the annular apron, will pull the ring cover and establish in the outside of a plurality of support columns in step 3 to guarantee that a plurality of support columns support tightly on the internal perisporium of pulling the ring, the axle center of pulling the ring is coaxial with the axle center that a plurality of support columns belonged to encircle, after the pulling the ring is placed and is finished, connect annular apron on the support column.
Through adopting above-mentioned technical scheme, the support column supports tightly on the inside wall of traction ring, and in the heating process, the traction ring can't inwards contract or squint to the deformation of traction ring has been avoided.
The invention is further configured to: the detachable structure comprises a threaded hole formed in the support column and a counter bore formed in the annular cover plate, and the annular cover plate is connected with the support column through a bolt.
By adopting the technical scheme, the quick disassembly and assembly of the large-batch traction ring can be facilitated by the detachable structure, so that the working efficiency of heat treatment processing can be improved.
The invention is further configured to: the pressing force of the cover plate on the traction ring is 17N.
By adopting the technical scheme, when the traction ring is heated, because the cover plate applies pressure to the traction ring, the end face of the traction ring is not easy to deform, and meanwhile, 17N pressure is not easy to cause extrusion deformation of a workpiece.
The invention is further configured to: the time of the low-temperature artificial aging treatment in the step 6 is 30 hours.
By adopting the technical scheme, the long-time low-temperature artificial aging treatment is beneficial to stabilizing the few residual austenite remained after the cold treatment, and can also reduce the squareness and the residual stress of the martensite to the minimum degree, thereby obtaining high hardness and wear resistance.
The invention is further configured to: in step 6, the surface of the traction ring is finished by using a grinder to perform stress annealing treatment.
Through adopting above-mentioned technical scheme, through carrying out the correct grinding to the surface of pull ring, reduced the inside effect stress of pull ring on the one hand for it has stronger structural strength, and on the other hand can make the surface of pull ring more smooth, can reduce the frictional resistance in the pull ring uses.
In conclusion, the invention has the following beneficial effects: the traction ring has higher hardness through high-temperature heating and quenching treatment in a cold oil medium, the wear resistance of the traction ring is effectively improved, the austenite remained on the traction ring after the quenching treatment can be continuously transformed into martensite through the tempering treatment, the amount of the remained austenite is reduced, thereby effectively reducing the internal stress generated by the traction ring during cold treatment, facilitating the stability of the remaining few residual austenite after the cold treatment by long-time low-temperature artificial aging treatment, and can also reduce the squareness and the residual stress of the martensite to the minimum degree, obtain high hardness and wear resistance, by fine grinding the surface of the traction ring, on the one hand the action stresses inside the traction ring are reduced, the traction ring has stronger structural strength, and on the other hand, the surface of the traction ring can be smoother, so that the friction resistance of the traction ring in use can be reduced.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic structural view of a positioning tool and a traction ring according to the present invention;
in the figure: 1. a traction ring; 11. a keyway; 12. a ratchet; 2. positioning a tool; 21. an annular base; 22. A support pillar; 23. an annular cover plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, a heat treatment process for a traction ring, the traction ring 1 comprising ratchet teeth 12 provided on one end surface thereof and key grooves 11 provided on an inner side wall thereof, comprises the steps of:
step 1: preparing a workpiece, and checking the geometric shape of the traction ring 1 to ensure that the surface of the traction ring 1 has no burrs, cracks, scratches and rusts;
step 2: designing a positioning tool 2, designing the positioning tool 2 matched with the traction ring 1 according to the characteristics of the geometric shape of the traction ring 1, requiring that batch processing can be realized in the heat treatment process, and ensuring that the traction ring 1 cannot deform in the heating process;
and step 3: assembling, namely sequentially assembling the plurality of traction rings 1 obtained in the step 1 on the positioning tool 2 obtained in the step 2;
and 4, step 4: quenching, namely when the temperature of the heat treatment furnace reaches 630 ℃, hoisting the positioning tool 2 and the traction ring 1 in the step 3 into the heat treatment furnace, continuously heating to 640 ℃, keeping the temperature for a period of time at 640 ℃, continuously heating to 720-740 ℃, and then immediately taking out the positioning tool 2 and the traction ring 1, putting the positioning tool and the traction ring into a cold oil medium, and cooling to room temperature;
and 5: tempering, cooling the traction ring 1 in the step 4 for 3 hours, putting the traction ring into a heat treatment furnace again, heating the traction ring to 140-150 ℃, and preserving heat for 3 hours at the temperature of 140-150 ℃;
step 6: and (3) annealing, namely cooling the heat treatment furnace in the step (5) to 110-120 ℃ for long-time low-temperature artificial aging treatment, and carrying out stress annealing treatment on the surface of the traction ring 1 at 110-120 ℃, wherein the traction ring 1 is not easy to deform in the heat treatment process, and the traction ring 1 obtained by the heat treatment process has the advantages of high hardness, strong wear resistance and long service life.
On the basis, the positioning tool 2 comprises an annular base 21, the annular base 21 is fixedly connected with a plurality of supporting columns 22 for supporting the inner peripheral wall of the traction ring 1, the supporting columns 22 are arranged in a ring shape, one end of the support columns 22 far away from the annular base 21 is detachably connected with an annular cover plate 23 through a detachable structure, the traction ring 1 is sleeved outside the support columns 22 in the step 3, and ensures that the plurality of supporting columns 22 are tightly propped against the inner peripheral wall of the traction ring 1, the axis of the traction ring 1 is coaxial with the axis of the ring where the plurality of supporting columns 22 are positioned, after traction ring 1 placed, connect annular apron 23 on support column 22 to make the apron pressfitting on traction ring 1, support column 22 supports tightly on traction ring 1's inside wall, and in the heating process, traction ring 1 can't inwards contract or squint, thereby has avoided traction ring 1's deformation.
On the basis, detachable construction is including seting up the screw hole on support column 22 and seting up the counter bore on annular cover plate 23, annular cover plate 23 passes through the bolt and is connected with support column 22, can make things convenient for the quick assembly disassembly who draws ring 1 in batches greatly through detachable construction's setting to can improve the work efficiency of thermal treatment processing.
On the basis, the pressing force of the cover plate on the traction ring 1 is 17N, when the traction ring 1 is heated, the cover plate applies pressure to the traction ring 1, so that the end face of the traction ring 1 is not easy to deform, and meanwhile, the 17N pressure is not easy to cause extrusion deformation of a workpiece.
On the basis, the time of the low-temperature artificial aging treatment in the step 6 is 30 hours, and the long-time low-temperature artificial aging treatment is beneficial to stabilizing the remaining extremely small amount of retained austenite after the cold treatment, and can also reduce the squareness and the residual stress of martensite to the minimum degree, thereby obtaining high hardness and wear resistance.
On the basis, in step 6, the surface of the traction ring 1 is finely ground by using a grinding machine to perform stress annealing treatment, and the surface of the traction ring 1 is finely ground, so that the action stress inside the traction ring 1 is reduced, the traction ring has stronger structural strength, the surface of the traction ring 1 can be smoother, and the friction resistance of the traction ring 1 in use can be reduced.
The invention heats at high temperature and carries out quenching treatment in cold oil medium, so that the traction ring 1 has higher hardness, the wear resistance of the traction ring 1 is effectively improved, the austenite remained on the traction ring 1 after quenching treatment can be continuously transformed into martensite through tempering treatment, the amount of the retained austenite is reduced, the internal stress generated by the traction ring 1 during cold treatment is effectively reduced, long-time low-temperature artificial aging treatment is favorable for stabilizing the remaining minimal retained austenite after cold treatment, the squareness and the residual stress of the martensite can be reduced to the minimum degree, high hardness and wear resistance are obtained, the surface of the traction ring 1 is finely ground, on one hand, the action stress in the traction ring 1 is reduced, so that the traction ring has stronger structural strength, on the other hand, the surface of the traction ring 1 is smoother, the frictional resistance in use of the traction ring 1 can be reduced.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (6)
1. A traction ring heat treatment process, wherein the traction ring (1) comprises ratchet teeth (12) arranged on one end surface and a key groove (11) arranged on the inner side wall, and is characterized in that: the heat treatment process comprises the following steps:
step 1: preparing a workpiece, and checking the geometric shape of the traction ring (1) to ensure that the surface of the traction ring (1) is free of burrs, cracks, scratches and rusts;
step 2: designing a positioning tool (2), designing the positioning tool (2) matched with the traction ring (1) according to the characteristics of the geometric shape of the traction ring (1), requiring that batch processing can be realized in the heat treatment process, and ensuring that the traction ring (1) cannot deform in the heating process;
and step 3: assembling, namely sequentially assembling a plurality of traction rings (1) obtained in the step (1) on the positioning tool (2) obtained in the step (2);
and 4, step 4: quenching, namely when the temperature of the heat treatment furnace reaches 630 ℃, hoisting the positioning tool (2) and the traction ring (1) in the step 3 into the heat treatment furnace, continuously heating to 640 ℃, keeping the temperature for a period of time at 640 ℃, continuously heating to 720-740 ℃, and then immediately taking out the positioning tool (2) and the traction ring (1), putting into a cold oil medium, and cooling to room temperature;
and 5: tempering, cooling the traction ring (1) in the step 4 for 3 hours, putting the traction ring into a heat treatment furnace again, heating the traction ring to 140-150 ℃, and preserving heat for 3 hours at the temperature of 140-150 ℃;
step 6: and (4) annealing, namely cooling the heat treatment furnace in the step (5) to 110-120 ℃, performing long-time low-temperature artificial aging treatment, and performing stress annealing treatment on the surface of the traction ring (1) at the temperature of 110-120 ℃.
2. The heat treatment process for the traction ring as claimed in claim 1, wherein: location frock (2) include annular base (21), fixedly connected with is used for supporting a plurality of support columns (22) of traction ring (1) internal perisporium on annular base (21), and is a plurality of support column (22) ring shape sets up, the one end that annular base (21) were kept away from in support column (22) can be dismantled through detachable construction and be connected with annular apron (23), overlaps the outside at a plurality of support columns (22) with traction ring (1) in step 3 to guarantee that a plurality of support columns (22) support tightly on the internal perisporium of traction ring (1), the axle center of traction ring (1) is coaxial with the axle center of a plurality of support column (22) place ring, after traction ring (1) is placed and is finished, connects annular apron (23) on support column (22), and makes the apron pressfitting on traction ring (1).
3. The heat treatment process for the traction ring as claimed in claim 2, wherein: the detachable structure comprises a threaded hole formed in the supporting column (22) and a counter bore formed in the annular cover plate (23), and the annular cover plate (23) is connected with the supporting column (22) through a bolt.
4. The heat treatment process for the traction ring as claimed in claim 2, wherein: the pressing force of the cover plate on the traction ring (1) is 17N.
5. The heat treatment process for the traction ring as claimed in claim 1, wherein: the time of the low-temperature artificial aging treatment in the step 6 is 30 hours.
6. The heat treatment process for the traction ring as claimed in claim 1, wherein: in step 6, the surface of the traction ring (1) is subjected to finish grinding by using a grinding machine to perform stress annealing treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110254290.2A CN113046524B (en) | 2021-03-05 | 2021-03-05 | Traction ring heat treatment process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110254290.2A CN113046524B (en) | 2021-03-05 | 2021-03-05 | Traction ring heat treatment process |
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| CN113046524B CN113046524B (en) | 2024-02-27 |
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