CN114908225A - Constant velocity universal joint heat treatment process for dune buggy - Google Patents
Constant velocity universal joint heat treatment process for dune buggy Download PDFInfo
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- CN114908225A CN114908225A CN202210651876.7A CN202210651876A CN114908225A CN 114908225 A CN114908225 A CN 114908225A CN 202210651876 A CN202210651876 A CN 202210651876A CN 114908225 A CN114908225 A CN 114908225A
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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
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a heat treatment process of a constant velocity universal joint for a dune buggy, which comprises the steps of providing an electromagnetic induction type heating device for heat treatment of a conveyor belt, heating a handle part or an inner cavity of the constant velocity universal joint by the heating device to a temperature higher than a critical temperature Ac1 during quenching, and then rapidly cooling by a cooling device; during tempering, the heating device heats the shank part or the inner cavity of the constant velocity universal joint to a temperature below a critical temperature Ac1, and then the constant velocity universal joint is naturally cooled; wherein the moving distance after tempering is larger than that after quenching so as to ensure enough natural cooling time after tempering. The invention can ensure the smooth operation of the whole heat treatment process and is beneficial to improving the heat treatment efficiency.
Description
Technical Field
The invention relates to the technical field of dune buggy manufacturing, in particular to a constant-speed universal joint heat treatment process for a dune buggy.
Background
The beach vehicle can freely run on any terrain, is generally provided with tires wider than a sedan, and can generate larger friction force on soft sand to ensure that the tires cannot slip and idle. Can run on riverbeds, streams, mountain forests and even worse deserts.
The beach vehicle has severe use condition, so the requirements on the performance of chassis parts are strict, and the constant velocity universal joint driving shaft of the chassis part is required to have the characteristics of high strength, high fatigue resistance and strong impact toughness.
Therefore, the constant velocity universal joint has better performance through technical breakthrough of materials on one hand, and the mechanical performance of the constant velocity universal joint is improved through improvement of a heat treatment process on the other hand. Generally, the heat treatment of the constant velocity universal joint comprises quenching and tempering, and with the progress of the technology, the heat treatment of the conventional constant velocity universal joint generally adopts furnace quenching to improve the hardness and rigidity of parts, and the parts are cooled and then subjected to furnace tempering to improve the toughness of the parts and avoid the cracking phenomenon of the parts.
The so-called furnace quenching and furnace tempering means that the parts are sent into a heat treatment furnace to be heated and heated, and then the parts are taken out to be rapidly cooled or naturally cooled. However, this kind of process has a fatal defect, because the heat treatment furnace heats the parts by means of heat conduction, the heating time of the parts is long, and the heat treatment time is long, and the production efficiency is low. Therefore, the induction quenching and tempering process is invented according to the principle of the induction cooker. Eddy current is generated in the part through the induction coil, so that the part is heated rapidly, and the aims of shortening the heat treatment time and improving the production efficiency are fulfilled. For example, the disclosure of "a through type induction tempering apparatus" in the chinese patent literature, publication No. CN211497697U, includes an induction tempering channel, a cooling channel, and a conveyor belt, the conveyor belt penetrates through the induction tempering channel and the cooling channel, tempering inductors are disposed at two sides of the induction tempering channel, cooling water spray pipes are disposed at two sides of the cooling channel, an opening of the induction tempering channel is a tempering inlet, and an opening of the cooling channel is a tempering outlet. Because the induction type tempering process is adopted, the tempering time is shortened, the processing takt of a production line is improved, and the requirements of more product specifications and models for tempering can be met.
However, when the existing induction tempering process is applied to the constant velocity universal joint of the dune buggy, the following technical defects still exist: first, since the shank and the inner cavity of the constant velocity universal joint need to be quenched and tempered separately, that is, need to be quenched and tempered secondarily, and as the technology advances and the degree of automation is continuously improved, the constant velocity universal joint needs to be quenched, tempered primarily, quenched and tempered secondarily at the same time on a production line. That is, it is required to keep the tempo as uniform as possible between the steps. Because the cooling speed during quenching is high and the cooling speed during tempering is low, the time beat between primary tempering and secondary quenching is inconsistent, and the smooth operation of the whole production beat can be influenced.
Disclosure of Invention
The invention aims to provide a constant velocity universal joint heat treatment process for a dune buggy, which can ensure the smooth operation of the whole heat treatment process and is beneficial to improving the heat treatment efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
a constant velocity universal joint heat treatment process for a dune buggy comprises the following steps:
a. the constant velocity universal joint is sequentially and transversely positioned on a positioning device on a heat treatment conveyor belt according to a time interval delta T, the heat treatment conveyor belt comprises a primary quenching station with an electromagnetic induction type heating device, a primary tempering station, a secondary quenching station, a secondary tempering station and a collecting station for collecting the constant velocity universal joint after heat treatment, the heat treatment conveyor belt comprises a long time period between the secondary tempering station and the collecting station and a short time period between the secondary quenching station and the secondary tempering station, the length of the long time period is L1, the length of the short time period is L2, and L1/L2 is more than or equal to 2;
b. when the constant velocity universal joint moves to a primary quenching station, the shank of the constant velocity universal joint is heated by the electromagnetic induction type heating device to a temperature higher than a critical temperature Ac1, and then the shank of the constant velocity universal joint is rapidly cooled by the cooling device, so that primary quenching of the shank of the constant velocity universal joint is completed;
c. when the constant velocity universal joint moves to a primary tempering station, the electromagnetic induction type heating device heats the shank of the constant velocity universal joint to a temperature below a critical temperature Ac1, and then the shank of the constant velocity universal joint is naturally cooled, so that primary tempering of the shank of the constant velocity universal joint is completed;
d. when the constant velocity universal joint moves to a secondary quenching station, the electromagnetic induction type heating device heats the inner cavity of the constant velocity universal joint in natural cooling to a temperature higher than a critical temperature Ac1, and then the cooling device is used for rapidly cooling the inner cavity of the constant velocity universal joint, so that secondary quenching of the inner cavity of the constant velocity universal joint is completed;
e. when the constant velocity universal joint moves to a secondary tempering station, the electromagnetic induction type heating device heats the inner cavity of the constant velocity universal joint to a temperature below a critical temperature Ac1, and then the inner cavity of the constant velocity universal joint is naturally cooled, so that secondary tempering of the constant velocity universal joint is completed.
Similar to the prior art, the de heat treatment conveyor belt comprises a primary quenching station, a primary tempering station, a secondary quenching station and a secondary tempering station, and is beneficial to maintaining continuous rhythm among the working procedures. As discussed in the background of the invention, the cooling time for tempering is typically greater than the cooling time for quenching, and it is understood that the area of the cavity is much greater than the area of the shank, i.e., the time required to cool the cavity is greater than the time required to cool the shank under the same conditions. Therefore, the time from the secondary tempering station to the collection station is longest. Therefore, on the premise that the constant velocity joint after the secondary tempering can be sufficiently cooled, the constant velocity joints of other stations can be sufficiently cooled without fail.
In order to improve the heat treatment efficiency of the constant velocity universal joints as much as possible, the constant velocity universal joints can be heated and quenched at a primary quenching station in sequence according to the time interval delta T. At the primary tempering station, or the secondary tempering station, the shank or the inner cavity of the constant velocity joint, which has not been completely cooled to room temperature at this time, may be reheated to a temperature below the critical temperature Ac1, or to thereby facilitate saving of cooling time.
In particular, the heat-treatment conveyor of the present invention comprises a long period of time between the secondary tempering station and the collection station, a short period of time between the secondary quenching station and the secondary tempering station, the long period of time having a length of L1, the short period of time having a length of L2, and the length between the long period of time and the short period of time being controlled in the following ranges: L1/L2 is more than or equal to 2. That is, the length of the long period of time is far longer than that of the short period of time, and the conveying time of the long period of time is also far longer than that of the short period of time under the same conveying speed, so that the constant velocity universal joint can be sufficiently cooled when being moved from the secondary tempering station to the collecting station. It will be appreciated that by properly setting the length between the stations, we can ensure that the constant velocity joint has sufficient cooling time after tempering, and consequently that the tact time is the same between the processes.
The critical temperature Ac1 is a starting temperature of pearlite transformation to austenite when heating, and naturally, the critical temperature Ac1 differs for different materials. In addition, the temperature below the critical temperature Ac1 in steps c and e can also be implemented according to the parameters of the existing tempering process. The critical temperature Ac1, and the quenching and tempering temperatures for different materials are known in the art, and the meaning thereof is fully understood and implemented by those skilled in the art, and thus, they will not be described in detail herein.
Preferably, the electromagnetic induction type heating device positioned at the primary quenching station and the primary tempering station comprises an electromagnetic coil capable of moving transversely, and in the steps b and c, the electromagnetic coil is sleeved on the handle part of the constant velocity universal joint to heat the constant velocity universal joint.
Because the primary quenching station and the primary tempering station heat and cool the handle part of the constant velocity universal joint to realize quenching and tempering, the electromagnetic coil capable of moving transversely is convenient to be sleeved on the handle part of the constant velocity universal joint to heat the handle part of the constant velocity universal joint.
Preferably, the electromagnetic induction type heating device positioned at the secondary quenching station and the secondary tempering station comprises an electromagnetic bar capable of moving transversely, and in the steps d and e, the electromagnetic bar is inserted into an inner cavity of the constant velocity universal joint to heat the constant velocity universal joint.
And at the secondary quenching station and the secondary tempering station, the heating device comprises an electromagnetic bar capable of moving transversely, so that when the constant velocity universal joint moves to the secondary quenching station and the secondary tempering station, the electromagnetic bar can move transversely and be inserted into the inner cavity of the constant velocity universal joint so as to heat the inner cavity of the constant velocity universal joint. That is to say, the invention only heats the part of the constant velocity universal joint which needs heat treatment at each station, which is beneficial to realizing rapid heating and temperature rise, saving electric energy and avoiding adverse effect caused by heating the same part for many times.
Preferably, the power of the electromagnetic induction type heating devices positioned at the primary quenching station and the secondary quenching station is W1, the power of the electromagnetic induction type heating devices positioned at the primary tempering station and the secondary tempering station is W2, and the power is more than or equal to 3 and less than or equal to W1/W2 and less than or equal to 5.
By reasonably designing the proportional relation between the power W1 during quenching and the power W2 during tempering, the thickness of the tempering heating layer is larger than that of the quenching layer on the premise of ensuring full quenching, thereby ensuring the completeness of tempering.
Preferably, electromagnetic induction heating devices are provided on both the left and right sides of the heat treatment conveyer, and in step a, the stem portions of the odd-numbered constant velocity universal joints are directed to the left side and the stem portions of the even-numbered constant velocity universal joints are directed to the right side.
Therefore, the heating devices on the left side and the right side can heat and raise the temperature of the constant velocity universal joint in sequence, and the heat treatment efficiency is improved. It is understood that the heating device on the left side can heat the shanks of the odd number of constant velocity joints and the inner cavities of the even number of constant velocity joints, and the heating device on the right side can heat the shanks of the even number of constant velocity joints and the inner cavities of the odd number of constant velocity joints.
Preferably, the cooling device in step b and step d comprises a cooling cylinder sleeved outside the heat treatment conveyor belt, a spraying hole capable of spraying cooling liquid is arranged on the inner side wall of the cooling cylinder positioned at the upper side of the heat treatment conveyor belt, and a liquid outlet hole connected with the liquid pump is arranged on the inner side wall of the cooling cylinder positioned at the lower side of the heat treatment conveyor belt.
When the constant velocity universal joint heated on the heat treatment conveying belt passes through the cooling cylinder during primary quenching and secondary quenching, the spraying holes can spray cooling liquid to the constant velocity universal joint, so that the high-temperature constant velocity universal joint is rapidly cooled to realize quenching.
In particular, the cooling liquid can be extracted outwards through the liquid outlet hole on the inner side wall of the cooling cylinder on the lower side of the heat treatment conveyor belt, so that the accumulation and overflow of the cooling liquid in the cooling cylinder can be avoided, and the cooling liquid can be recycled and filtered outside.
Preferably, the cooling device in steps c and e comprises a cooling cylinder sleeved outside the heat treatment conveyor belt, the inner side wall of the cooling cylinder positioned at the upper side of the heat treatment conveyor belt is provided with an air injection hole capable of injecting cooling air flow, and the inner side wall of the cooling cylinder positioned at the lower side of the heat treatment conveyor belt is provided with an air suction hole connected with an air suction pump.
During primary tempering and secondary tempering, when the constant velocity universal joint heated on the heat treatment conveying belt passes through the cooling cylinder, the air suction holes can spray cooling air flow to the constant velocity universal joint, so that the high-temperature constant velocity universal joint is cooled at a constant speed to realize tempering.
In particular, the cooling air flow can be extracted outwards through the air suction holes on the inner side wall of the cooling cylinder at the lower side of the heat treatment conveyor belt, so that the adverse effect of the overflow of the cooling air flow in the cooling cylinder on the heating temperature rise of the constant velocity universal joint is avoided.
Therefore, the invention has the following beneficial effects: the smooth operation of the whole heat treatment process can be ensured, and the heat treatment efficiency can be improved.
Drawings
FIG. 1 is a schematic view of a heat treatment belt.
FIG. 2 is a schematic view showing a structure of a cooling apparatus for quenching.
FIG. 3 is a schematic view of a structure of a cooling device for tempering.
In the figure: 1. the device comprises a heat treatment conveyor belt 11, a positioning device 12, a primary quenching station 13, a primary tempering station 14, a secondary quenching station 15, a secondary tempering station 16, a collecting station 2, a constant velocity universal joint 3, a heating device 4, a cooling device 41, a cooling cylinder 411, spraying holes 412, liquid outlet holes 413, gas spraying holes 414 and air suction holes.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
As shown in fig. 1, a heat treatment process for a constant velocity universal joint for a dune buggy comprises primary quenching and primary tempering of a handle part of the constant velocity universal joint, and secondary quenching and secondary tempering of an inner cavity of the constant velocity universal joint, and specifically comprises the following steps:
a. the constant velocity universal joint 2 is sequentially and transversely positioned on a positioning device 11 on a heat treatment conveyor belt 1 according to a time interval delta T, the heat treatment conveyor belt comprises a primary quenching station 12, a primary tempering station 13, a secondary quenching station 14, a secondary tempering station 15 and a collecting station 16 for collecting the constant velocity universal joint after heat treatment, wherein the heat treatment conveyor belt positioned between the primary quenching station and the primary tempering station is a first section, the heat treatment conveyor belt positioned between the primary tempering station and the secondary quenching station is a second section, the heat treatment conveyor belt positioned between the secondary quenching station and the secondary tempering station is a third section, and the heat treatment conveyor belt positioned between the secondary tempering station and the collecting station is a fourth section. It will be appreciated that the cooling time required for tempering will be longer than the cooling time required for quenching. Correspondingly, the constant velocity universal joint after the secondary tempering needs to be cooled to room temperature and then can enter a collecting station for collection, so that subsequent processing or assembly can be carried out, and the constant velocity universal joint after the primary tempering only needs to be cooled to a certain degree to heat and raise the temperature of the inner cavity, so that secondary quenching can be carried out. Further, the time required to cool the internal cavity may be longer than the time required to cool the shank portion under the same conditions. That is, the time required for the fourth segment is longest. Therefore, we refer to the fourth segment located between the secondary tempering station and the collection station as a long period having a length of L1, the third segment located between the secondary quenching station and the secondary tempering station as a short period having a length of L2, and the ratio of the long period to the short period is controlled in the following range: L1/L2 is more than or equal to 2, so that the time interval delta T can be set according to the cooling time required by the constant velocity universal joint after secondary tempering, and as long as the constant velocity universal joint after secondary tempering can be sufficiently cooled after a long period of time, the constant velocity universal joints at other stations can be sufficiently cooled;
b. when the constant velocity universal joint moves to a primary quenching station, the electromagnetic induction type heating device heats the shank of the constant velocity universal joint to a temperature higher than a critical temperature Ac1, and then the cooling device 4 is used for rapidly cooling the shank of the constant velocity universal joint, thereby completing primary quenching of the shank of the constant velocity universal joint;
c. when the constant velocity universal joint moves to a primary tempering station, the electromagnetic induction type heating device heats the shank of the constant velocity universal joint to a temperature below a critical temperature Ac1, and then the shank of the constant velocity universal joint is naturally cooled, so that primary tempering of the shank of the constant velocity universal joint is completed;
d. when the constant velocity universal joint moves to a secondary quenching station, the electromagnetic induction type heating device heats the inner cavity of the constant velocity universal joint in natural cooling to a temperature higher than a critical temperature Ac1, and then the cooling device is used for rapidly cooling the inner cavity of the constant velocity universal joint, so that secondary quenching of the inner cavity of the constant velocity universal joint is completed;
e. when the constant velocity universal joint moves to a secondary tempering station, the electromagnetic induction type heating device heats the inner cavity of the constant velocity universal joint to a temperature below a critical temperature Ac1, and then the inner cavity of the constant velocity universal joint is naturally cooled, so that secondary tempering of the constant velocity universal joint is completed.
Certainly, when the constant velocity universal joint after the secondary tempering moves to the collection station, the constant velocity universal joint can be collected in a manual mode, or an automatic mobile phone can be realized through a manipulator, so that subsequent processing and assembly are facilitated.
The critical temperature Ac1 is a starting temperature of pearlite transformation to austenite when heating, and naturally, the critical temperature Ac1 differs for different materials. In addition, the temperature below the critical temperature Ac1 in steps c and e can also be implemented according to the parameters of the existing tempering process. The critical temperature Ac1, and the quenching and tempering temperatures for different materials are known in the art, and the meaning thereof can be fully understood and implemented by those skilled in the art, and therefore, the detailed description thereof will not be given in the present embodiment.
In addition, on the premise of the same conveying speed of the heat treatment conveying belt, the lengths of the first section to the fourth section can be reasonably set, so that the constant velocity universal joint has sufficient cooling time after tempering, and the production takt time among all working procedures can be kept the same. For example, the time required for the primary quenching, the primary tempering, the secondary quenching and the secondary tempering is t, kt, t, ft, wherein f > k, the lengths of the first section to the fourth section can be L, kL, L, f L, respectively.
Preferably, the electromagnetic induction type heating device located at the primary quenching station and the primary tempering station comprises an electromagnetic coil capable of moving transversely. Therefore, in the steps b and c, the electromagnetic coil can transversely move and is sleeved on the handle part of the constant velocity universal joint to perform induction heating on the constant velocity universal joint, and the electromagnetic coil can also avoid unnecessary induction heating on the rest parts of the constant velocity universal joint.
Similarly, the electromagnetic induction type heating devices positioned at the secondary quenching station and the secondary tempering station comprise electromagnetic bars capable of moving transversely. Thus, in steps d and e, the electromagnetic bar can move transversely and is inserted into the inner cavity of the constant velocity universal joint to heat the constant velocity universal joint.
It should be noted that the electromagnetic coil and the electromagnetic bar are both coils in nature, and the main difference is only the shape and size. In this embodiment, the moving direction of the heat treatment conveyer is referred to as a longitudinal direction, and the left-right direction perpendicular to the heat treatment conveyer is referred to as a lateral direction.
Furthermore, the power of the electromagnetic induction type heating devices positioned at the primary quenching station and the secondary quenching station is W1, the power of the electromagnetic induction type heating devices positioned at the primary tempering station and the secondary tempering station is W2, and W1/W2 is not less than 3 and not more than 5, on the premise of ensuring sufficient quenching, the thickness of the tempering heating layer is larger than that of the quenching layer, so that the tempering sufficiency is ensured.
As a preferred scheme, electromagnetic induction type heating devices can be respectively arranged on the left side and the right side of a heat treatment conveyor belt of a primary quenching station, a primary tempering station, a secondary quenching station and a secondary tempering station. Thus, in step a, the shanks of odd number of constant velocity joints such as 1, 3, 5, 7 … … can be oriented to the left, and the shanks of even number of constant velocity joints such as 2, 4, 6, 8 … … can be oriented to the right.
Therefore, when the constant velocity universal joints move to a primary quenching station and a primary tempering station, the heating device on the left side can sequentially heat odd number of constant velocity universal joints, and the heating device on the right side can sequentially heat even number of constant velocity universal joints; when the constant velocity universal joints move to a secondary quenching station and a secondary tempering station, the heating device on the right side can sequentially heat and raise the temperature of odd number of constant velocity universal joints, and the heating device on the left side can sequentially heat and raise the temperature of even number of constant velocity universal joints, so that the heat treatment efficiency is favorably improved.
As another preferred scheme, as shown in fig. 2, the cooling device in steps b and d comprises a cooling cylinder 41 sleeved outside the heat treatment conveyor belt, a spraying hole 411 capable of spraying cooling liquid is arranged on the inner side wall of the cooling cylinder positioned at the upper side of the heat treatment conveyor belt, and a liquid outlet hole 412 connected with the liquid pump is arranged on the inner side wall of the cooling cylinder positioned at the lower side of the heat treatment conveyor belt.
In this way, in the primary quenching and the secondary quenching, when the constant velocity universal joint heated on the heat treatment conveyor passes through the cooling cylinder, the spray holes can spray the cooling liquid to the constant velocity universal joint, so that the high-temperature constant velocity universal joint is rapidly cooled to realize the quenching. In addition, the cooling liquid can be extracted outwards through a liquid outlet hole in the inner side wall of the cooling cylinder positioned on the lower side of the heat treatment conveying belt, so that not only can the gathering and overflow of the cooling liquid in the cooling cylinder be avoided, but also the cooling liquid can be recycled and filtered outside for reuse. Certainly, the front end and the rear end of the cooling cylinder on the lower side of the heat treatment conveying belt can be respectively provided with liquid blocking ribs so as to prevent the cooling liquid falling into the lower part of the cooling cylinder from overflowing from the two ends.
In addition, as shown in fig. 3, the cooling device in step c and step e includes a cooling cylinder covering the heat treatment conveyer belt, an air injection hole 413 for injecting cooling air is provided on the inner sidewall of the cooling cylinder located at the upper side of the heat treatment conveyer belt, and an air suction hole 414 connected to the air suction pump is provided on the inner sidewall of the cooling cylinder located at the lower side of the heat treatment conveyer belt.
Thus, when the constant velocity universal joint heated and heated on the heat treatment conveyor belt passes through the cooling cylinder during primary tempering and secondary tempering, the air suction holes can spray cooling air flow to the constant velocity universal joint, so that the high-temperature constant velocity universal joint is cooled at a constant speed to realize tempering. Of course, the cooling air flow can be drawn out through the air suction holes on the inner side wall of the cooling cylinder on the lower side of the heat treatment conveyor belt, so that the adverse effect of overflow of the cooling air flow in the cooling cylinder on heating and temperature rising of the constant velocity universal joint is avoided.
Claims (7)
1. A constant velocity universal joint heat treatment process for a dune buggy is characterized by comprising the following steps:
a. the constant velocity universal joint is sequentially and transversely positioned on a positioning device on a heat treatment conveyor belt according to a time interval delta T, the heat treatment conveyor belt comprises a primary quenching station with an electromagnetic induction type heating device, a primary tempering station, a secondary quenching station, a secondary tempering station and a collecting station for collecting the constant velocity universal joint after heat treatment, the heat treatment conveyor belt comprises a long time period between the secondary tempering station and the collecting station and a short time period between the secondary quenching station and the secondary tempering station, the length of the long time period is L1, the length of the short time period is L2, and L1/L2 is more than or equal to 2;
b. when the constant velocity universal joint moves to a primary quenching station, the shank of the constant velocity universal joint is heated by the electromagnetic induction type heating device to a temperature higher than a critical temperature Ac1, and then the shank of the constant velocity universal joint is rapidly cooled by the cooling device, so that primary quenching of the shank of the constant velocity universal joint is completed;
c. when the constant velocity universal joint moves to a primary tempering station, the electromagnetic induction type heating device heats the shank of the constant velocity universal joint to a temperature below a critical temperature Ac1, and then the shank of the constant velocity universal joint is naturally cooled, so that primary tempering of the shank of the constant velocity universal joint is completed;
d. when the constant velocity universal joint moves to a secondary quenching station, the electromagnetic induction type heating device heats the inner cavity of the constant velocity universal joint in natural cooling to a temperature higher than a critical temperature Ac1, and then the cooling device is used for rapidly cooling the inner cavity of the constant velocity universal joint, so that secondary quenching of the inner cavity of the constant velocity universal joint is completed;
e. when the constant velocity universal joint moves to a secondary tempering station, the electromagnetic induction type heating device heats the inner cavity of the constant velocity universal joint to a temperature below a critical temperature Ac1, and then the inner cavity of the constant velocity universal joint is naturally cooled, so that secondary tempering of the constant velocity universal joint is completed.
2. The heat treatment process for the constant velocity universal joint of the dune buggy as claimed in claim 1, wherein the electromagnetic induction type heating device located at the primary quenching station and the primary tempering station comprises an electromagnetic coil capable of moving transversely, and in the steps b and c, the electromagnetic coil is sleeved on the handle part of the constant velocity universal joint to heat the same.
3. The heat treatment process for the constant velocity universal joint of the dune buggy as claimed in claim 1, wherein the electromagnetic induction type heating means located at the secondary quenching station and the secondary tempering station comprises an electromagnetic bar capable of moving laterally, and in the steps d and e, the electromagnetic bar is inserted into the inner cavity of the constant velocity universal joint to heat the same.
4. The heat treatment process for the constant velocity universal joint of the all terrain vehicle as set forth in claim 1, wherein the power of the electromagnetic induction heating means located at the primary quenching station and the secondary quenching station is W1, and the power of the electromagnetic induction heating means located at the primary tempering station and the secondary tempering station is W2, and 3 ≤ W1/W2 ≤ 5.
5. The heat treatment process for constant velocity universal joints for beach vehicles as claimed in claim 1, wherein electromagnetic induction heating devices are provided on both the left and right sides of the heat treatment belt, respectively, and in step a, the shanks of the odd number of constant velocity universal joints are directed to the left side and the shanks of the even number of constant velocity universal joints are directed to the right side.
6. The heat treatment process for the constant velocity universal joint of the beach vehicle as claimed in claim 1, wherein the cooling means in steps b and d comprises a cooling cylinder fitted around the heat treatment conveyer belt, the cooling cylinder positioned on the upper side of the heat treatment conveyer belt is provided with spray holes for spraying a cooling liquid, and the cooling cylinder positioned on the lower side of the heat treatment conveyer belt is provided with liquid outlet holes connected to the liquid pump.
7. The heat treatment process for a constant velocity universal joint of a beach vehicle as claimed in claim 1, wherein the cooling means in steps c and e comprises a cooling cylinder fitted around the heat treatment conveyer belt, and wherein the inside wall of the cooling cylinder located on the upper side of the heat treatment conveyer belt is provided with air injection holes for injecting cooling air, and the inside wall of the cooling cylinder located on the lower side of the heat treatment conveyer belt is provided with air suction holes connected to an air suction pump.
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| JPH059584A (en) * | 1991-06-28 | 1993-01-19 | Ntn Corp | Heat treatment of outer ring of uniform-speed universal joint |
| JP2007262440A (en) * | 2006-03-27 | 2007-10-11 | Ntn Corp | Induction heating apparatus |
| JP2009007595A (en) * | 2007-06-26 | 2009-01-15 | High Frequency Heattreat Co Ltd | Tempering apparatus and tempering method |
| CN104975147A (en) * | 2015-07-06 | 2015-10-14 | 安徽索特汽车零部件有限公司 | Heat treatment technology of automobile outer joint bell-shaped shell |
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