CN117587199A - Quenching method for diesel engine crankshaft for controlling deformation - Google Patents
Quenching method for diesel engine crankshaft for controlling deformation Download PDFInfo
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- CN117587199A CN117587199A CN202311509920.1A CN202311509920A CN117587199A CN 117587199 A CN117587199 A CN 117587199A CN 202311509920 A CN202311509920 A CN 202311509920A CN 117587199 A CN117587199 A CN 117587199A
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- 238000010791 quenching Methods 0.000 title claims abstract description 135
- 230000000171 quenching effect Effects 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005496 tempering Methods 0.000 claims abstract description 55
- 230000006698 induction Effects 0.000 claims abstract description 27
- 210000003739 neck Anatomy 0.000 claims description 76
- 238000010438 heat treatment Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 13
- 238000005507 spraying Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 6
- 238000003754 machining Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000009191 jumping Effects 0.000 description 10
- 239000002609 medium Substances 0.000 description 8
- 239000012526 feed medium Substances 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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 quenching method for a diesel engine crankshaft for controlling deformation, which comprises the steps of leveling the crankshaft, carrying out medium frequency induction surface quenching on a crankshaft connecting rod neck by adopting a jump quenching mode, measuring the direction with the maximum jump, tempering the crankshaft main journal in the upward direction with the maximum jump, carrying out medium frequency induction surface quenching on the crankshaft main journal by adopting a jump quenching mode, measuring the direction with the maximum jump, carrying out secondary tempering in the upward direction with the maximum jump, and carrying out grinding processing on each crankshaft neck after tempering. The jump quenching mode is adopted, the secondary tempering is combined, the purpose of controlling the deformation of the large quenching depth crankshaft is realized, the jump medium frequency quenching method is adopted for the manufactured multi-type high-speed diesel engine crankshaft, the machining quantity required to be ground is reduced to 0.6mm from the original 1mm, the swing difference of each journal is controlled within 0.35mm, the difficult problems of controlling the quenching depth and the grinding quantity of the crankshaft are solved, the stable mass production of the large quenching depth crankshaft is realized, and the economic benefit is remarkable.
Description
Technical Field
The invention belongs to the technical field of crankshaft heat treatment deformation control, and relates to a diesel engine crankshaft quenching method for controlling deformation.
Background
The induction heat treatment strengthening of the crankshaft has a special position on the whole crankshaft processing line, and once the deformation is out of tolerance or the heat treatment quality is unqualified, the whole crankshaft is scrapped; deformation caused by induction quenching of a crankshaft is a common problem in production, and the control of the deformation quantity has profound influence on the processing and usability of the crankshaft; because of the influence factors of the heat treatment process, the deformation amount is not easy to control, and fluctuates in a reasonable range, the magnitude of the heat treatment deformation amount seriously influences the subsequent finishing amount: the crankshaft finish machining amount is large due to the overlarge heat treatment deformation, so that the machining cost is increased, and the machining efficiency is reduced; excessive deformation can also cause eccentric wear or black skin of the crankshaft, directly resulting in reduced performance or eventual rejection of the crankshaft.
The related factors influencing the induction quenching deformation of the crankshaft are numerous, namely the structural stress generated by structural change in the induction heat treatment process, the quality of a crankshaft blank forging is determined by the structural form and chemical components, and the deformation of the workpiece is further influenced by the hardenability of steel, the specific volume of the structure, the residual austenite amount and the like; the original structure, such as the form, size, number and distribution of carbides, segregation of alloying elements, stress state, forging quality, direction of rolling forming fibers, etc., all affect the deformation of the crankshaft.
And secondly, the crankshaft is a typical asymmetric complex part, the quenching area is irregular, the heating is uneven, and the deformation is easy to generate. The most easily deformed part is the joint of the connecting rod crank and the journal, the structure stress is generated due to the transformation of metallographic structure when the fillet quenching of the crankshaft is reinforced, and the crankshaft is plastically deformed when the structure stress is greater than the yield strength of the material; on the premise that the depth of the hardening layer meets the technical requirement, the larger the depth of the hardening layer is, the larger the deformation of the crankshaft is.
Meanwhile, because the induction quenching of the crankshaft is performed on a special quenching machine tool, the big end is clamped by a three-jaw self-centering chuck, the small end is positioned by adopting an auxiliary sleeve, and the crankshaft is mainly subjected to the common action of 4 external forces in the quenching process to finish the process, the working procedures are respectively that the gravity of the crankshaft, the radial pressure (the radial pressure is applied by a transformer and an inductor floating mechanism and changes at any time in the induction quenching process of the crankshaft), the axial clamping force of the end and the bending moment born by the crankshaft can all lead to the deformation of the crankshaft, so the deformation control becomes the key point of the medium-frequency quenching of the crankshaft.
The medium-frequency quenching process of the crankshaft generally adopts single-turn successive quenching, and because of local heat expansion and cold contraction, the whole deformation, particularly the large quenching depth of the crankshaft, can increase the heating time and increase the heat input quantity, is more difficult to control in the state, and can easily lead to the whole scrapping of the crankshaft due to the reduction of the subsequent machining allowance.
Disclosure of Invention
The invention aims to provide a quenching method for a diesel engine crankshaft for controlling deformation, which solves the problem that the deformation of the crankshaft is difficult to control in the existing large quenching depth crankshaft process, so that the whole crankshaft is scrapped.
The technical scheme adopted by the invention is that the quenching method for the diesel engine crankshaft for controlling deformation comprises the following steps:
step 1, after the crankshaft is leveled, performing medium-frequency induction surface quenching on a crankshaft connecting rod neck in a jump quenching mode, measuring the direction of the maximum jump, and marking;
step 2, tempering the crankshaft, namely tempering the crankshaft at 250-350 ℃ upwards in the direction of the maximum jump marked in the step 1, wherein the tempering time is 3-6 h;
step 3, after the crankshaft is leveled, performing medium-frequency induction surface quenching on the main journal of the crankshaft in a jump quenching mode, measuring the direction of the maximum jump, and marking;
and 4, tempering at the temperature of 250-350 ℃ upwards in the direction of the maximum jump marked in the step 3, wherein the tempering time is 3-6 h, and grinding the journal of the crankshaft after tempering.
In the step 1, the crankshaft is leveled, which comprises clamping a front end first journal flange, a middle journal and a rear end journal flange on a crankshaft intermediate frequency quenching machine by using a three-jaw chuck, then adjusting a supporting device, and measuring by using a level gauge to ensure that the crankshaft is leveled.
In the step 1, the medium frequency induction surface quenching of the crankshaft connecting rod neck is performed in a jump quenching mode, and the quenching sequence of the crankshaft connecting rod neck is as follows assuming that the crankshaft is n turns: connecting rod neck 1-connecting rod neck n-connecting rod neck 2-connecting rod neck n-1-connecting rod neck 3-connecting rod neck n-2-connecting rod neck 4-connecting rod neck n-3- … …, and according to the quenching sequence rule, until all the connecting rod necks are quenched.
In the step 1, the medium frequency induction surface quenching of the crankshaft connecting rod neck is performed in a jump quenching mode, and the quenching process comprises the following steps: the rotating speed is 100 revolutions per minute, the heating time is 25-35 seconds, the water-based quenching liquid is adopted, the concentration is 10-15%, the water spraying flow is 15-25L/min, and the spraying time is more than 150 seconds.
In the step 2, the thrust bearing and the n+1th main journal of the crankshaft are supported by a V-shaped bracket, and then tempering treatment is carried out on the crankshaft.
In the step 3, the medium frequency induction surface quenching of the main journal of the crankshaft is performed by adopting a jump quenching mode, and the quenching sequence is as follows: thrust journal- & gt main journal 2- & gt main journal n & lt+1 & gt main journal 3- & gt main journal n- & gt main journal 4- & gt main journal n-1- & gt main journal 5- & gt main journal n-2- & gt … …, according to the quenching sequence law, until the quenching treatment of all thrust journals and main journals is completed.
The invention has the beneficial effects that the purpose of controlling the deformation of the large quenching depth crankshaft is realized by optimizing the quenching sequence of the crank throw during the medium frequency quenching of the crankshaft, namely adopting a jump quenching mode and combining the secondary tempering, the processing amount of the manufactured multi-type high-speed diesel engine crankshaft is reduced from the original 1mm to 0.6mm by adopting the jump medium frequency quenching method, the deflection of each journal is controlled within 0.35mm, the difficult problems of controlling the quenching depth and the grinding amount of the crankshaft are solved, the batch stable production of the large quenching depth crankshaft is realized, and the economic benefit is remarkable.
Drawings
FIG. 1 is a schematic diagram of a diesel engine crankshaft having an n-turn configuration in accordance with the present invention;
FIG. 2 is a schematic view of a diesel engine crankshaft having a 6-turn structure according to embodiment 1 of the present invention;
FIG. 3 is a schematic view of a crankshaft structure of a diesel engine having a 10-turn structure in example 2 of the present invention;
in the figure, a crankshaft 1, a front end of the crankshaft 2, a thrust bearing 3, a main shaft diameter 4, a connecting rod neck 5 and a rear end of the crankshaft 6.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
A method for controlling distortion in a diesel engine crankshaft quench, referring to fig. 1, comprising the steps of:
step 1, leveling a crankshaft 1, namely clamping a first journal flange at the front end 2 of the crankshaft, a middle journal and a flange at the rear end 6 of the crankshaft on a medium-frequency quenching machine tool of the crankshaft 1 by using a three-jaw chuck, then adjusting a supporting device, and measuring by using a level gauge to ensure that the crankshaft is leveled;
step 2, performing medium-frequency induction surface quenching on the crankshaft connecting rod neck 5 in a jump quenching mode, and assuming that the crankshaft is n turns, the quenching sequence of the crankshaft connecting rod neck is as follows: connecting rod neck 1- & gt connecting rod neck n- & gt connecting rod neck 2- & gt connecting rod neck n-1- & gt connecting rod neck 3- & gt connecting rod neck n-2- & gt connecting rod neck 4- & gt connecting rod neck n-3- & gt … …, measuring the direction of maximum runout until all the connecting rod necks are quenched according to the quenching sequence rule, and marking; the medium frequency induction surface quenching process of the crankshaft connecting rod neck comprises the following steps: the rotating speed is 100 revolutions per minute, the heating time is 25-35 seconds, the water-based quenching liquid is adopted, the concentration is 10-15%, the water spraying flow is 15-25L/min, and the spraying time is more than 150 seconds.
Step 3, tempering the crankshaft, namely supporting a thrust bearing 3 and an n+1th main journal of the crankshaft by using a V-shaped bracket, and tempering upwards in the direction of the maximum jumping marked in the step 2, wherein the tempering temperature is 250-350 ℃ and the tempering time is 3-6 h;
and 4, adjusting the crankshaft to be horizontal on a crankshaft intermediate frequency quenching machine tool again, and performing intermediate frequency induction surface quenching on the crankshaft main journal 4 in a jump quenching mode, wherein the quenching sequence is as follows: thrust journal- & gt main journal 2- & gt main journal n & lt+ & gt 1- & gt main journal 3- & gt main journal n- & gt main journal 4- & gt main journal n-1- & gt main journal 5- & gt main journal n-2- & gt … …, measuring the direction of maximum jumping and marking according to the quenching sequence law until the quenching treatment of all thrust journals 3 and main journals 4 is completed;
step 5, secondary tempering is carried out on the crankshaft, a thrust bearing and an n+1th main journal of the crankshaft are supported by a V-shaped bracket, the secondary tempering is carried out upwards in the direction of the maximum jump marked in the step 4, the tempering temperature is 250-350 ℃, the tempering time is 3-6 h,
and 6, grinding the journal of the crankshaft after the secondary tempering, so that the dimensional requirement can be met.
Example 1
A method for controlling distortion in a 6-turn diesel engine crankshaft quench, referring to fig. 2, comprising the steps of:
step 1, leveling a crankshaft 1, namely clamping a first journal flange, a middle journal and a crankshaft rear end 6-neck flange at the front end 2 of the crankshaft by using a three-jaw chuck on a medium-frequency quenching machine tool of the crankshaft 1, then adjusting a supporting device, and measuring by using a level gauge to ensure that the crankshaft is leveled, wherein the crankshaft is 42CrMoA, the diameter of a main journal is 152mm, and the diameter of a connecting rod neck is 128mm;
step 2, performing medium frequency induction surface quenching on the crankshaft connecting rod neck 5 by adopting a jump quenching mode, wherein equipment adopted is an AKWH-F medium frequency quenching machine tool, and the quenching process comprises the following steps: the rotating speed is 100 revolutions per minute, the heating time is 35 seconds, water-based quenching liquid is adopted, the concentration is 13 percent, the water spraying flow is 25L/min, the spraying time is 200 seconds, and the quenching sequence of the crankshaft connecting rod journal is as follows: connecting rod neck 1, connecting rod neck 6, connecting rod neck 2, connecting rod neck 5, connecting rod neck 3 and connecting rod neck 4, measuring the direction of maximum jumping according to the quenching sequence rule until all connecting rod necks are quenched, and marking;
step 3, tempering the crankshaft, namely supporting a thrust bearing 3 and a 7 th main journal of the crankshaft by using a V-shaped bracket, and tempering upwards in the direction of the maximum jump marked in the step 2, wherein the tempering temperature is 300 ℃, and the tempering time is 4h;
and 4, adjusting the crankshaft to be horizontal on a crankshaft intermediate frequency quenching machine tool again, and performing intermediate frequency induction surface quenching on the crankshaft main journal 4 in a jump quenching mode, wherein the quenching sequence is as follows: the method comprises the steps of (1) measuring the direction of maximum jumping until quenching treatment of all thrust bearings and main journals is completed according to the quenching sequence rule, wherein the direction of maximum jumping is measured and marked;
step 5, secondary tempering is carried out on the crankshaft, a thrust bearing 3 and a 7 th main journal of the crankshaft are supported by a V-shaped bracket, the secondary tempering is carried out upwards in the direction of the maximum jumping marked in the step 4, the tempering temperature is 300 ℃, and the tempering time is 5h;
and 6, grinding the journal of the crankshaft after the secondary tempering, so that the dimensional requirement can be met.
Example 2
A method for controlling distortion in a crankshaft quench of a 10-crank diesel engine, referring to fig. 3, comprising the steps of:
step 1, leveling a crankshaft 1, namely clamping a first journal flange, a middle journal and a crankshaft rear end 6 neck flange of a front end 2 of the crankshaft on a crankshaft intermediate frequency quenching machine by using a three-jaw chuck, then adjusting a supporting device, measuring by using a level meter, and ensuring that the crankshaft is leveled, wherein the crankshaft is made of 30CrMo, the diameter of a main journal is 136mm, and the diameter of a connecting rod neck is 109 mm;
step 2, performing medium frequency induction surface quenching on the crankshaft connecting rod neck 5 by adopting a jump quenching mode, wherein equipment adopted is an AKWH-F medium frequency quenching machine tool, and the quenching process comprises the following steps: the rotating speed is 100 revolutions per minute, the heating time is 25 seconds, the water-based quenching liquid is adopted, the concentration is 12 percent, the water spraying flow is 15L/min, the spraying time is 180 seconds, and the quenching sequence of the crankshaft connecting rod journal is as follows: connecting rod neck 1-connecting rod neck 10-connecting rod neck 2-connecting rod neck 9-connecting rod neck 3-connecting rod neck 8-connecting rod neck 4-connecting rod neck 7-connecting rod neck 5-connecting rod neck 6, according to the quenching sequence rule, measuring the direction of maximum runout until all connecting rod necks are quenched, and marking;
step 3, tempering the crankshaft, namely supporting a thrust bearing 3 and an 11 th main journal of the crankshaft by using a V-shaped bracket, and tempering upwards in the direction of the maximum jump marked in the step 2, wherein the tempering temperature is 280 ℃, and the tempering time is 3h;
and 4, adjusting the crankshaft to be horizontal on a crankshaft intermediate frequency quenching machine tool again, and performing intermediate frequency induction surface quenching on the crankshaft main journal 4 in a jump quenching mode, wherein the quenching sequence is as follows: thrust journal 2, main journal 11, main journal 3, main journal 10, main journal 4, main journal 9, main journal 5, main journal 8, main journal 6 and main journal 7, according to the quenching sequence rule, measuring the direction of maximum jumping until all the thrust journal and main journal are quenched, and marking;
step 5, secondary tempering is carried out on the crankshaft, a thrust bearing 3 and an 11 th main journal of the crankshaft are supported by a V-shaped bracket, the secondary tempering is carried out upwards in the direction of the maximum jumping marked in the step 4, the tempering temperature is 280 ℃, and the tempering time is 4h;
and 6, grinding the journal of the crankshaft after the secondary tempering, so that the dimensional requirement can be met.
Example 3
A method for controlling the quenching of a deformed 12-throw diesel engine crankshaft, comprising the steps of:
step 1, leveling a crankshaft, namely clamping a first journal flange at the front end, a middle journal and a flange at the rear end by using a three-jaw chuck on a crankshaft intermediate-frequency quenching machine tool, then adjusting a supporting device, and measuring by using a level meter to ensure that the crankshaft is adjusted to be horizontal, wherein the crankshaft is made of 42CrMoA, the diameter of a main journal is 152mm, and the diameter of a connecting rod journal is 128mm;
step 2, performing medium-frequency induction surface quenching on the crankshaft connecting rod neck by adopting a jump quenching mode, wherein equipment adopted is an AKWH-F medium-frequency quenching machine tool, and the quenching process comprises the following steps: the rotating speed is 100 revolutions per minute, the heating time is 30 seconds, water-based quenching liquid is adopted, the concentration is 15%, the water spraying flow is 20L/min, the spraying time is 300 seconds, and the quenching sequence of the crankshaft connecting rod journal is as follows: connecting rod neck 1-connecting rod neck 12-connecting rod neck 2-connecting rod neck 11-connecting rod neck 3-connecting rod neck 10-connecting rod neck 4-connecting rod neck 9-connecting rod neck 5-connecting rod neck 8-connecting rod neck 6-connecting rod neck 7, measuring the direction of maximum jumping until quenching treatment of all connecting rod necks is completed according to the quenching sequence rule, and marking;
step 3, tempering the crankshaft, namely supporting a thrust bearing and a 13 th main journal of the crankshaft by using a V-shaped bracket, and tempering upwards in the direction of the maximum jump marked in the step 2, wherein the tempering temperature is 320 ℃, and the tempering time is 6h;
and 4, adjusting the crankshaft to be horizontal on a crankshaft intermediate frequency quenching machine tool again, and performing intermediate frequency induction surface quenching on a main journal of the crankshaft in a jump quenching mode, wherein the quenching sequence is as follows: thrust journal 2, main journal 13, main journal 3, main journal 12, main journal 4, main journal 11, main journal 5, main journal 10, main journal 6, main journal 9, main journal 7 and main journal 8, according to the quenching sequence rule, measuring the direction of maximum jumping until all the thrust journals and main journals are quenched, and marking;
step 5, secondary tempering is carried out on the crankshaft, a thrust bearing and a 7 th main journal of the crankshaft are supported by a V-shaped bracket, the secondary tempering is carried out upwards in the direction of the maximum jump marked in the step 4, the tempering temperature is 320 ℃, the tempering time is 6h,
and 6, grinding the journal of the crankshaft after the secondary tempering, so that the dimensional requirement can be met.
Claims (6)
1. A method for quenching a diesel engine crankshaft for controlling deformation, comprising the steps of:
step 1, after the crankshaft is leveled, performing medium-frequency induction surface quenching on a crankshaft connecting rod neck in a jump quenching mode, measuring the direction of the maximum jump, and marking;
step 2, tempering the crankshaft, namely tempering the crankshaft at 250-350 ℃ upwards in the direction of the maximum jump marked in the step 1, wherein the tempering time is 3-6 h;
step 3, after the crankshaft is leveled, performing medium-frequency induction surface quenching on the main journal of the crankshaft in a jump quenching mode, measuring the direction of the maximum jump, and marking;
and 4, tempering at the temperature of 250-350 ℃ upwards in the direction of the maximum jump marked in the step 3, wherein the tempering time is 3-6 h, and grinding the journal of the crankshaft after tempering.
2. The method for quenching a crankshaft of a diesel engine for controlling deformation according to claim 1, wherein in the step 1, the crankshaft is leveled, comprising clamping a front first journal flange, a middle journal and a rear journal flange with a three jaw chuck on a crankshaft intermediate frequency quenching machine, and then adjusting a supporting device, and measuring with a level gauge, to ensure that the crankshaft is leveled.
3. The method for quenching a crankshaft of a diesel engine for controlling deformation according to claim 1, wherein in the step 1, the medium frequency induction surface quenching of the connecting rod neck of the crankshaft is performed by means of jump quenching, and the quenching sequence of the connecting rod neck of the crankshaft is as follows, assuming that the crankshaft is n turns: connecting rod neck 1-connecting rod neck n-connecting rod neck 2-connecting rod neck n-1-connecting rod neck 3-connecting rod neck n-2-connecting rod neck 4-connecting rod neck n-3- … …, and according to the quenching sequence rule, until all the connecting rod necks are quenched.
4. The quenching method of diesel engine crankshaft for controlling deformation according to claim 3, wherein in the step 1, the medium frequency induction surface quenching of the crankshaft connecting rod neck is performed by adopting a jump quenching mode, and the quenching process is as follows: the rotating speed is 100 revolutions per minute, the heating time is 25-35 seconds, the water-based quenching liquid is adopted, the concentration is 10-15%, the water spraying flow is 15-25L/min, and the spraying time is more than 150 seconds.
5. The method for quenching a crankshaft of a diesel engine for controlling deformation according to claim 4, wherein in the step 2, a thrust bearing and an n+1-th main journal of the crankshaft are supported by a V-bracket, and then the tempering treatment of the crankshaft is performed.
6. The method for quenching a crankshaft of a diesel engine for controlling deformation according to claim 5, wherein in the step 3, the medium frequency induction surface quenching of the main journal of the crankshaft is performed by means of jump quenching, and the quenching sequence is as follows: thrust journal- & gt main journal 2- & gt main journal n & lt+1 & gt main journal 3- & gt main journal n- & gt main journal 4- & gt main journal n-1- & gt main journal 5- & gt main journal n-2- & gt … …, according to the quenching sequence law, until the quenching treatment of all thrust journals and main journals is completed.
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| CN202311509920.1A CN117587199A (en) | 2023-11-13 | 2023-11-13 | Quenching method for diesel engine crankshaft for controlling deformation |
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| CN202311509920.1A CN117587199A (en) | 2023-11-13 | 2023-11-13 | Quenching method for diesel engine crankshaft for controlling deformation |
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