CN103481014B - Engine crankshaft fillet rolling and reinforcing method - Google Patents
Engine crankshaft fillet rolling and reinforcing method Download PDFInfo
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- CN103481014B CN103481014B CN201310426237.1A CN201310426237A CN103481014B CN 103481014 B CN103481014 B CN 103481014B CN 201310426237 A CN201310426237 A CN 201310426237A CN 103481014 B CN103481014 B CN 103481014B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 55
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001125 extrusion Methods 0.000 claims abstract description 62
- 238000009661 fatigue test Methods 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 14
- 238000009826 distribution Methods 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P9/00—Treating or finishing surfaces mechanically, with or without calibrating, primarily to resist wear or impact, e.g. smoothing or roughening turbine blades or bearings; Features of such surfaces not otherwise provided for, their treatment being unspecified
- B23P9/02—Treating or finishing by applying pressure, e.g. knurling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The present invention discloses engine crankshaft fillet rolling and reinforcing method, it may also be useful to milled head carries out the finish rolling hardening processing of crankshaft fillet, comprises the following steps: (1) sets up engine crankshaft model on computers; (2) bent axle working order is simulated on computers, by calculating, it is determined that crankshaft fillet roll extrusion power; (3) milled head roll extrusion fillet, milled head angle and the roll extrusion number of turns is determined; Engine crankshaft fillet is carried out finish rolling hardening processing; (4) finish rolling hardening product is carried out fatigue test; (5) according to fatigue test results, select reinforcing degree to meet roll extrusion power and the roll extrusion number of turns value of set(ting)value, engine crankshaft fillet is carried out roll extrusion; Stress is concentrated the crankshaft fillet position being easier to fracture to carry out finish rolling hardening by the present invention, can effectively relax stress concentration phenomenon, and enhancement stress concentrates position, and crankshaft fillet reinforcing degree can improve 60%��100%.
Description
Technical field
The present invention relates to engine crankshaft, it is specifically related to engine crankshaft fillet rolling and reinforcing method.
Background technology
Bent axle bears bending load and torsional load at work, and internal unbalanced engine crankshaft also bears interior bending and shearing; Do not take the bent axle of torsional vibration damper measure, it is also possible to there is the twisting vibration elasticity moment that amplitude is bigger. These load are all alternations, it is possible to cause crankshaft fatigue to lose efficacy. Practice shows, bending load has decisive role, and it is main damage form that flexural fatigue lost efficacy. Therefore, the research emphasis of crankshaft structure intensity is bending fatigue strength.
Bent axle is complex-shaped, and stress concentration phenomenon is quite serious, and especially at the excessive fillet place of connecting rod axle journal and crankweb, and the stress of oil passage near exit is concentrated particularly outstanding. Common crankshaft breakdown, fatigue cracking all starts from rounded edges place, and port is roughly at 45 �� with axial line. For automobile with small output volumn, space is compact, and simultaneously for meeting dynamic performance, vehicle design must lightweight to greatest extent; Engine crankshaft Intensity Design is limited to a certain extent, and crankshaft breakdown phenomenon is inevitable.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that crankshaft strength can be improved, prevent the engine crankshaft fillet rolling and reinforcing method of crankshaft breakdown.
In order to realize above-mentioned purpose, the technical solution used in the present invention is:
This engine crankshaft fillet rolling and reinforcing method, it may also be useful to milled head carries out the finish rolling hardening processing of crankshaft fillet, comprises the following steps;
(1) engine crankshaft model is set up on computers;
(2) bent axle working order is simulated on computers, by calculating, it is determined that crankshaft fillet roll extrusion power;
(3) milled head roll extrusion fillet, milled head angle and the roll extrusion number of turns is determined; Engine crankshaft fillet is carried out finish rolling hardening processing;
(4) finish rolling hardening product is carried out fatigue test;
(5) according to fatigue test results, select reinforcing degree to meet roll extrusion power and the roll extrusion number of turns value of set(ting)value, engine crankshaft fillet is carried out roll extrusion.
Described crankshaft fillet is respectively main journal fillet and connecting rod neck fillet.
Described step sets up engine crankshaft model by CAE in (2), and simulation bent axle working order, calculates the stress distribution of crankshaft fillet, obtain crankshaft fillet roll extrusion power, it is determined that crankshaft fillet rolls pressure scales.
In described step (3), main journal fillet according to bent axle and connecting rod neck fillet determine milled head roll extrusion fillet.
Described step (3) is determined the angle of milled head according to crankshaft fillet position.
Described step (3) adopts many group roll extrusion number of turns values.
Described milled head is connected with propulsion source.
The milled head angle of rolling crankshafts main journal fillet is equal with main bearing journal fillet circle center line connecting angle, and rolling crankshafts connecting rod neck fillet rolling head angle is equal with crank-shaft link neck fillet circle center line connecting angle.
The milled head fillet of rolling crankshafts main journal fillet is less than main bearing journal fillet, and the milled head fillet of rolling crankshafts connecting rod neck fillet is less than crank-shaft link neck fillet.
In described step (5), reinforcing degree set(ting)value is that crankshaft fillet reinforcing degree improves 60%��100%.
It is an advantage of the current invention that: this engine crankshaft fillet rolling and reinforcing method, by CAE supplementary means, in conjunction with fatigue test, carries out roll extrusion parameter optimization; After obtaining best roll extrusion parameter, adopt milled head to engine crankshaft fillet rolling and reinforcing. This engine crankshaft fillet rolling and reinforcing method, concentrates stress the crankshaft fillet position being easier to fracture to carry out finish rolling hardening, can effectively relax stress concentration phenomenon, and enhancement stress concentrates position, and crankshaft fillet reinforcing degree can improve 60%��100%. And engine crankshaft round corner rolling process is after parameter determines, post-production is simple, and reinforcing degree height, can not only strengthen the intensity of part, also can simplify process for processing, substantially increases the intensity of engine and economical.
Accompanying drawing explanation
Mark in the content expressed by each width accompanying drawing of specification sheets of the present invention below and figure is briefly described:
Fig. 1 is the structural representation of the engine crankshaft fillet of inventive engine crankshaft fillet finish rolling hardening method.
Fig. 2 is the schematic diagram of inventive engine crankshaft fillet finish rolling hardening method.
Fig. 3 is the roll extrusion power of inventive engine crankshaft fillet finish rolling hardening method and the graph of a relation of the roll extrusion number of turns.
Mark in above-mentioned figure is:
1-connecting rod axle journal, 2-connecting rod neck fillet, 3-main journal fillet, 4-main journal, 5-roll extrusion power, 6-milled head angle, 7-milled head.
Embodiment
Compare accompanying drawing below, by the description to optimum embodiment, the specific embodiment of the present invention is described in further detail.
As depicted in figs. 1 and 2, the crankshaft fillet that crankshaft breakdown phenomenon easily occurs, is respectively the connecting rod neck fillet 2 at connecting rod axle journal 1 place and the main journal fillet 3 at main journal 4 place.
This engine crankshaft fillet rolling and reinforcing method, it may also be useful to milled head 7 carries out the finish rolling hardening processing of crankshaft fillet, and milled head 7 is connected with propulsion source, comprises the following steps;
(1) engine crankshaft model is set up on computers; Being specially: engine specifications is different, engine crankshaft is different; According to concrete engine crankshaft, it may also be useful to microcomputer modelling software, in modeling software, input the parameters such as engine crankshaft each section of length and width, height and axle journal fillet, draw out engine crankshaft model; Modeling software is the multiple three-dimensional drawing software comprising PROE and CATIA;
(2) engine crankshaft mode input step (1) obtained is in CAE, CAE inputs each performance perameter of engine, the working order of simulated engine bent axle, calculate the stress distribution of crankshaft fillet, draw crankshaft fillet roll extrusion power, it is determined that crankshaft fillet rolls pressure scales;
(3) milled head roll extrusion fillet, milled head angle and the roll extrusion number of turns is determined; Engine crankshaft fillet is carried out finish rolling hardening processing;
The milled head angle of rolling crankshafts main journal fillet 3 is equal with main bearing journal fillet 3 circle center line connecting angle, and the milled head angle of rolling crankshafts connecting rod neck fillet 2 is equal with crank-shaft link neck fillet 2 circle center line connecting angle;
The milled head fillet of rolling crankshafts main journal fillet 3 is less than main bearing journal fillet 3, and the milled head fillet of rolling crankshafts connecting rod neck fillet 2 is less than crank-shaft link neck fillet 2;
Roll extrusion number of turns value is many groups according to test and Selection;
(4) finish rolling hardening product is carried out fatigue test;
(5) according to fatigue test results, select reinforcing degree to meet roll extrusion power and the roll extrusion number of turns value of set(ting)value, engine crankshaft fillet is carried out roll extrusion.
Preferred reinforcing degree set(ting)value is that crankshaft fillet reinforcing degree improves 60%��100%.
The crankshaft fillet reinforcing degree that above-mentioned steps (3) obtains is raising 60%��100%.
This engine crankshaft fillet rolling and reinforcing method, crankshaft fillet roll extrusion needs to meet four factor: milled head 7 fillet, and milled head 7 milled head angle (is determined by the angle of milled head 7), roll extrusion power, the roll extrusion number of turns.
The fillet of milled head 7 is selected according to axle journal fillet, general milled head 7 fillet should not be greater than axle journal fillet, if milled head 7 fillet is greater than axle journal fillet will form point cantact in journal surface, axle journal intensity so not only can not be made to increase, the cracking of axle journal can be caused on the contrary, therefore preferably milled head 7 fillet is less than axle journal fillet.
Then milled head angle 6 is determined according to the circle center line connecting angle of main journal fillet 3 and connecting rod neck fillet 2, it is ensured that roll extrusion position is correct.
Generally obtaining an initial roll extrusion power 5 by cae analysis means, it is determined that the numerical range of roll extrusion power 5, then determine the number of turns of roll extrusion and the graph of a relation of power according to test, these roll extrusion basic parameters carry out processing and manufacturing again after deciding.
It is all get by cae analysis means or test due to these parameters, the therefore general setting numerical range that all roll extrusion power can be floated or float downward, the roll extrusion number of turns selects many groups, carries out processing and manufacturing; Then the crank throw of the bent axle of processing and manufacturing is carried out fatigue test, according to the result of fatigue test finally determines which kind of roll extrusion parameter of production and application.
According to verification experimental verification, our bent axle is after processing through rolling technology, and reinforcing degree can improve 60%��100%, and this reinforcing degree can meet the requirement of strength of the big load engine crankshaft of existing high speed.
Using the four-stroke oil engine of discharge capacity 1.6-2.2T as preferred embodiment, engine crankshaft fillet rolling and reinforcing method, comprises the following steps;
(1) the four-stroke oil engine crank-resolved model of 1.6T, 1.8T, 2.0T and 2.2T is set up on computers respectively by PROE modeling software;
(2) crank-resolved model that step (1) obtains is input in CAE respectively, CAE inputs the four-stroke oil engine performance perameter of 1.6T, 1.8T, 2.0T and 2.2T respectively, simulation bent axle working order; CAE calculates, and show that crankshaft fillet roll extrusion power is 7-9KN, it is determined that roll extrusion power is 6-11KN;
The four-cycle diesel machine crankshaft of 1.6-2.2T, the milled head angle of rolling crankshafts main journal fillet 3 is equal with main bearing journal fillet 3 circle center line connecting angle;
The milled head angle of rolling crankshafts connecting rod neck fillet 2 is equal with crank-shaft link neck fillet 2 circle center line connecting angle;
The milled head fillet of rolling crankshafts main journal fillet 3 0.8��1mm less of main bearing journal fillet 3; Rolling crankshafts connecting rod neck fillet 2 milled head fillet 0.8��1mm less of crank-shaft link neck fillet 2;
The roll extrusion number of turns need to be defined as many groups according to trial value, it is preferable that three groups, is respectively 2-4 circle, and 4-6 encloses, and 6-8 encloses;
Adopt above roll extrusion parameter, the four-stroke oil engine engine crankshaft fillet of 1.6-2.2T is carried out finish rolling hardening processing;
Four-cycle diesel machine crankshaft after finish rolling hardening is carried out fatigue test, selects the degree of being strengthened to meet roll extrusion power and the roll extrusion number of turns value of set(ting)value requirement according to fatigue test results, engine crankshaft fillet is carried out roll extrusion.
As shown in Figure 3, be that 4KN be gradually raised to 8��12KN roll extrusion 2��6 enclose after to engine crankshaft fillet rolling process as: initial roll extrusion power taking the satisfactory roll extrusion power that obtains and roll extrusion number of turns value, roll extrusion power be reduced to 4KN again roll extrusion 2��4 enclose. According to fatigue test checking, adopting above roll extrusion power and the roll extrusion number of turns, crankshaft fillet reinforcing degree can improve 60%��100%.
Obvious specific implementation of the present invention is not subject to the restrictions described above, as long as have employed the improvement of the various unsubstantialities that the design of the method for the present invention carries out with technical scheme, all within protection scope of the present invention.
Claims (3)
1. engine crankshaft fillet rolling and reinforcing method, it is characterised in that: use milled head to carry out the finish rolling hardening processing of crankshaft fillet, comprise the following steps;
(1) engine crankshaft model is set up on computers;
(2) bent axle working order is simulated on computers, by calculating, it is determined that crankshaft fillet roll extrusion power;
(3) milled head roll extrusion fillet, milled head angle and the roll extrusion number of turns is determined; Engine crankshaft fillet is carried out finish rolling hardening processing;
(4) finish rolling hardening product is carried out fatigue test;
(5) according to fatigue test results, select reinforcing degree to meet roll extrusion power and the roll extrusion number of turns value of set(ting)value, engine crankshaft fillet is carried out roll extrusion;
Described crankshaft fillet is respectively main journal fillet and connecting rod neck fillet;
By CAE simulated engine bent axle working order in described step (2), calculate the stress distribution of crankshaft fillet, obtain crankshaft fillet roll extrusion power, it is determined that crankshaft fillet rolls pressure scales;
In described step (3), main journal fillet according to bent axle and connecting rod neck fillet determine milled head roll extrusion fillet; The angle of milled head is determined according to crankshaft fillet position; Adopt many group roll extrusion number of turns values;
The milled head angle of rolling crankshafts main journal fillet is equal with main bearing journal fillet circle center line connecting angle, and rolling crankshafts connecting rod neck fillet rolling head angle is equal with crank-shaft link neck fillet circle center line connecting angle;
The milled head fillet of rolling crankshafts main journal fillet is less than main bearing journal fillet, and the milled head fillet of rolling crankshafts connecting rod neck fillet is less than crank-shaft link neck fillet.
2. engine crankshaft fillet rolling and reinforcing method as claimed in claim 1, it is characterised in that: described milled head is connected with propulsion source.
3. engine crankshaft fillet rolling and reinforcing method as claimed in claim 2, it is characterised in that: in described step (5), reinforcing degree set(ting)value is that crankshaft fillet reinforcing degree improves 60%��100%.
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| CN201310426237.1A CN103481014B (en) | 2013-09-17 | 2013-09-17 | Engine crankshaft fillet rolling and reinforcing method |
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| CN201310426237.1A CN103481014B (en) | 2013-09-17 | 2013-09-17 | Engine crankshaft fillet rolling and reinforcing method |
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| CN103481014B true CN103481014B (en) | 2016-06-01 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104191157A (en) * | 2014-08-08 | 2014-12-10 | 滨州海得曲轴有限责任公司 | Crankshaft six-wheel rolling device |
| CN107598481A (en) * | 2017-09-27 | 2018-01-19 | 湖北三环锻造有限公司 | Knuckle axle journal rolling technology |
| CN108942098B (en) * | 2018-07-23 | 2020-02-14 | 桂林福达曲轴有限公司 | Process method for improving surface hardness of rear end journal of engine crankshaft |
| CN115478156A (en) * | 2022-08-15 | 2022-12-16 | 中国第一汽车股份有限公司 | Method for removing surface stress at round corner of cast iron axle housing by floating roller |
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