CN104646457A - Crankshaft journal straightness correcting method - Google Patents
Crankshaft journal straightness correcting method Download PDFInfo
- Publication number
- CN104646457A CN104646457A CN201510021436.3A CN201510021436A CN104646457A CN 104646457 A CN104646457 A CN 104646457A CN 201510021436 A CN201510021436 A CN 201510021436A CN 104646457 A CN104646457 A CN 104646457A
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- China
- Prior art keywords
- crankshaft journal
- roll extrusion
- value
- supporting roller
- crankshaft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/16—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially adapted methods or means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention relates to the technical field of crankshaft machining, in particular to a crankshaft journal straightness correcting method. The method mainly comprises the following steps of (1) finely grinding a crankshaft journal; (2) carrying out nitrogen treatment on the finely ground crankshaft journal; (3) mounting a supporting rolling post on a lower rolling head; (4) mounting the crankshaft journal between an upper rolling head and the lower rolling head, and clamping the crankshaft journal; (5) mounting a rolling wheel onto the upper rolling head; (6) starting a motor to drive a crankshaft to rotate, wherein the rolling wheel rolls the crankshaft journal, the supporting rolling post corrects a crankshaft journal rolling bump and comprises a cylindrical part positioned on the middle part and a rotary curve surface part positioned on the end part, and in a rolling process, the rotary curve surface part on the end part is in contact with a crankshaft journal rolling bump line. The method has the advantages that rolling bump caused by plastic deformation nearby a crankshaft journal fillet can be corrected, and the crankshaft journal straightness is corrected.
Description
Technical field
The present invention relates to Crankshaft Machining technical field, relate to a kind of crankshaft journal linearity antidote particularly.
Background technology
Engine Exhaust Emission standard has become the focus that Global Auto industry is paid close attention to, low emission, of low pollution are the inexorable trends of automobile engine development, therefore, engine booster and charge inter cooling technology are arisen at the historic moment, along with the development of engine booster and charge inter cooling technology, require more and more higher to engine crankshaft fatigue strength, corresponding bent axle reinforcement process obtains very fast development in recent years, and wherein effect is exactly crankshaft fillet rolling and reinforcing technology the most significantly.
Crankshaft fillet rolling technology is divided into that fillet is heavy cuts roll extrusion and fillet is heavy cuts roll extrusion two kinds, when adopting that crankshaft fillet is heavy cuts rolling technology, because crankshaft journal before fillet rolling operation is through fine grinding, axle journal linearity is shaping, and bent axle fillet place in follow-up rolling process can be subject to great roll extrusion power, this roll extrusion power can make to produce plastic deformation near crankshaft fillet, this plastic deformation can produce roll extrusion projection, and along with adopting the increase of roll extrusion power in crankshaft fillet rolling process, the plastic deformation at crankshaft fillet place also can increase, the roll extrusion projection produced is also larger, thus shaping crankshaft journal linearity is destroyed, thus cause crankshaft journal linearity overproof, the application of crankshaft fillet rolling technology is caused to be extremely restricted.
As shown in Figures 2 and 3, during crankshaft journal roll extrusion, roller 1 is arranged on milled head 7, supporting roller 3 is arranged on lower milled head, when roller 1 pair of bent axle 2 axle journal roll extrusion, due to the effect of roller roll extrusion power, plastic deformation can be there is and then produce roll extrusion projection near crankshaft journal fillet.Existing supporting roller 3 is mostly cylindrical; as shown in Figure 4; when roll extrusion protruding along with crankshaft rotating to supporting roller 3 position time; columniform supporting roller and roll extrusion projection just point cantact, the power that supporting roller 3 acts in roll extrusion projection is very little, can only play a supportive role; the effect revising alignment can not be played to roll extrusion projection; alignment process can only be done to roll extrusion projection again, but often can have a negative impact to finish rolling hardening band during alignment process, thus finish rolling hardening effect can be weakened.
Summary of the invention
Technical problem to be solved by this invention, be exactly for the deficiency existing for prior art, and a kind of crankshaft journal linearity antidote is provided, the roll extrusion projection caused because of plastic deformation near crankshaft journal fillet can be revised by it, and then corrects the linearity of crankshaft journal.
This programme is achieved by the following technical measures: a kind of crankshaft journal linearity antidote, mainly comprises the following steps:
1) crankshaft journal is refined;
2) nitrogen treatment is carried out to the crankshaft journal after fine grinding;
3) supporting roller is installed on lower milled head;
4) crankshaft journal is installed between upper milled head and lower milled head, clamping crankshaft journal;
5) roller is installed on upper milled head;
6) open driven by motor crankshaft rotating, pair of rollers crankshaft journal carries out roll extrusion, and supporting roller is revised crankshaft journal roll extrusion projection;
Described supporting roller comprises the column part being positioned at middle part and the surface of revolution part being positioned at end, and the surface of revolution part of rolling process medial end portions contacts with crankshaft journal roll extrusion salient line.
During roll extrusion, the roller roll extrusion power acted on bent axle being arranged on milled head can make bent axle generation plastic deformation thus produce roll extrusion projection, when roll extrusion projection forwards lower milled head position to along with bent axle, the plain line being arranged on the supporting roller on lower milled head directly can contact with the plain line of roll extrusion projection, with existing cylindrical rollers compared with the point cantact of roll extrusion projection, the contact area with roll extrusion projection can be increased, and then the active force that can increase roll extrusion projection, the roll extrusion projection caused because of plastic deformation near axle journal fillet can be revised at high contact stress effect lower support roller, thus limit roll extrusion in rolling process can be realized, limit is revised, finish rolling hardening is effective and crankshaft journal linearity accuracy is high, can avoid after roll extrusion completes, increase separately the complexity revising operation again, the correction of setting up separately can also be avoided the impact of plastic deformation band thus weaken finish rolling hardening effect.
Preferably, the radius of curvature R of the surface of revolution part of described supporting roller end
lvalue be,
R
L＝τ/2+L/τ，
Wherein, τ refers to the height of maximum roll extrusion projection, the development length that L is protruding after referring to roll extrusion.
During design, determine the radius of curvature R of end surface of revolution part according to the numerical value of protruding development length after the height of maximum roll extrusion projection and roll extrusion
l, when can make roll extrusion, the contact wire of end curved sections and roll extrusion projection lengthens, thus contact stress is strengthened, good to the protruding correction effect of roll extrusion.
Closer, the value of development length L protruding after described roll extrusion is,
L＝R+[R
2+(R-h)
2]
0.5，
Wherein, R refers to roller radius of corner, and h refers to depth of cup.
Preferably, the value of the action t of the surface of revolution part of described supporting roller end is t=2 τ,
Wherein τ refers to the height of maximum roll extrusion projection.
Preferably, the value of the length B2 of the column part in the middle part of described supporting roller is,
B2＝B1-n×L，
Wherein, B1 refers to the total length of supporting roller, the development length that L is protruding after referring to roll extrusion, and n value is 3 ~ 5.
Closer, described n value is 4, and the value of the length B2 of the column part in the middle part of supporting roller is, B2=B1-4 × L.
Preferably, the value of the diameter d of the column part in the middle part of described supporting roller is,
d＝m+(D+R)/m，
Wherein, m refers to roller diameter, and D refers to crankshaft journal diameter, and R refers to roller radius of corner.
Closer, described m value is 16, and the value of the diameter d of the column part in the middle part of supporting roller is, d=16+ (D+R)/16.
Closer, the value of the height τ of described maximum roll extrusion projection is 0.01 ~ 0.03mm, and the value of development length L protruding after roll extrusion is 4 ~ 6mm, and the value of depth of cup h is 0.05 ~ 0.2mm.
The invention has the beneficial effects as follows: employing end is the supporting roller of surface of revolution, the plain line of the plain line and axle journal supporting shape in rolling process is directly contacted, at high contact stress effect lower support roller with crankshaft journal rolling process continuous rotation, gradually the roll extrusion projection caused because of plastic deformation near axle journal fillet is revised, thus greatly improve crankshaft journal linearity, the overproof problem of crankshaft journal straightway is effectively solved; In addition, utilize the supporting roller be arranged on lower milled head can realize limit roll extrusion in rolling process, limit is revised, can also ensure to weaken finish rolling hardening effect in the problem solving crankshaft journal linearity overproof simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of supporting roller of the present invention.
Fig. 2 is crankshaft journal fillet rolling schematic diagram.
Fig. 3 is A portion enlarged diagram in Fig. 2.
Fig. 4 is the structural representation of existing supporting roller.
In figure, 1, roller, 2, bent axle, 3, supporting roller, 4, crankshaft journal diameter D, 5, roller radius of corner R, 6, depth of cup h, 7, upper milled head, 8, the height τ of maximum roll extrusion projection, 9, supporting roller total length B1,10, column part length B2 in the middle part of supporting roller, 11, column part diameter d in the middle part of supporting roller, 12, supporting roller end surface of revolution part radius of curvature R
l, 13, supporting roller end surface of revolution part action t.
Detailed description of the invention
For the technical characterstic of this programme can be clearly demonstrated, below by detailed description of the invention, and in conjunction with its accompanying drawing, this programme is set forth.
As shown in Figure 1, a kind of crankshaft journal linearity rectification supporting roller of the present invention, , comprise supporting roller 3, this supporting roller 3 comprises the column part being positioned at middle part and the surface of revolution part being positioned at end, rolling process medial end portions surface of revolution part contacts with bent axle 2 axle journal roll extrusion salient line, the contact area of supporting roller 3 and roll extrusion projection can be increased, thus the active force of supporting roller 3 pairs of roll extrusion projections can be increased, at high contact stress effect lower support roller with crankshaft journal rolling process continuous rotation, gradually the roll extrusion projection caused because of plastic deformation near axle journal fillet is revised, thus crankshaft journal linearity can be improved, the overproof problem of axle journal linearity is effectively solved.
In embodiments of the invention, in order to increase the contact area of supporting roller and roll extrusion projection as far as possible, the value of the action t13 of supporting roller 3 end surface of revolution part is designed to t=2 τ, by its radius of curvature R
lthe value of 12 is designed to R
l=τ/2+L/ τ, wherein, τ 8 refers to the height of maximum roll extrusion projection, the development length that L is protruding after referring to roll extrusion.The protruding τ 8 of maximum roll extrusion records by actual fillet rolling test, development length L value in the following manner protruding after roll extrusion, L=R+ [R
2+ (R-h)
2]
0.5, wherein R5 is roller radius of corner, and h6 is depth of cup.
Action and the radius of curvature of supporting roller end surface of revolution part is determined according to protruding development length after the height of maximum roll extrusion projection and roll extrusion, the plain line of the plain line of end curved sections and roll extrusion projection can be made close as far as possible, thus obtain larger active force to obtain the protruding correction effect preferably of roll extrusion.In addition, adopt according to roll extrusion parameter and the parameter of bent axle own and determine protruding development length after the protruding and roll extrusion of maximum roll extrusion, can be applicable to different roll extrusion, versatility is good.
Particularly, value, depth of cup h are within the scope of 0.05 ~ 0.2mm during value within the scope of 4 ~ 6mm for the development length L protruding after value, roll extrusion within the scope of 0.01 ~ 0.03mm of the height τ of maximum roll extrusion projection, and resultant effect is better.
In embodiments of the invention, in the middle part of supporting roller 3, the value of the length B2 of column part is designed to, B2=B1-n × L, and wherein, B1 refers to supporting roller total length, and L is protruding development length after referring to roll extrusion, and n value is 3 ~ 5.The value of the diameter d 11 of middle part column part is designed to, and d=m+ (D+R)/m, wherein, m refers to roller diameter, and D refers to crankshaft journal diameter, and R refers to roller radius of corner.
During design, determine the length of middle part cylindrical section according to protruding development length after the total length of supporting roller and roll extrusion, determine the diameter of middle part cylindrical section according to crankshaft journal diameter and roller radius of corner, the intensity of installation requirement and supporting roller can be met.
Particularly, n value is 4, then the length B2=B1-4 × L of the middle part cylindrical section of supporting roller 3.M value is 16, then diameter d=the 16+ (D+R)/16 of the middle part cylindrical section of supporting roller 3, and now, supporting roller is easy for installation and the intensity of whole supporting roller is also higher.
A kind of method of correcting crankshaft journal linearity of the present invention, mainly comprises the following steps:
1) bent axle 2 axle journal is refined;
2) nitrogen treatment is carried out to bent axle 2 axle journal after fine grinding;
3) supporting roller 3 is installed on lower milled head;
4) bent axle 2 axle journal is installed between upper milled head 7 and lower milled head, then clamps bent axle 2 axle journal;
5) roller 1 is installed on upper milled head 7;
6) open driven by motor bent axle 2 to rotate, roller 1 pair of bent axle 2 axle journal carries out roll extrusion, and supporting roller 3 pairs of crankshaft journal roll extrusion projections are revised.
Bent axle is adopted to the processing technology of fine grinding-> nitrogenize-> roll extrusion, when roll extrusion, roll extrusion limit, limit can be realized by supporting roller to revise, the correction of finish rolling hardening and roll extrusion projection constantly can be carried out to roll extrusion band, subsequent correction alignment process can be avoided the weakening of finish rolling hardening band roll extrusion effect, and finish rolling hardening is effective and crankshaft journal linearity accuracy is high.
Can pass through without the technical characteristic described in the present invention or adopt existing techniques in realizing; do not repeat them here; certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned embodiment; the change that those of ordinary skill in the art makes in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (9)
1. a crankshaft journal linearity antidote, mainly comprises the following steps:
1) crankshaft journal is refined;
2) nitrogen treatment is carried out to the crankshaft journal after fine grinding;
3) supporting roller is installed on lower milled head;
4) crankshaft journal is installed between upper milled head and lower milled head, clamping crankshaft journal;
5) roller is installed on upper milled head;
6) open driven by motor crankshaft rotating, pair of rollers crankshaft journal carries out roll extrusion, and supporting roller is revised crankshaft journal roll extrusion projection;
Described supporting roller comprises the column part being positioned at middle part and the surface of revolution part being positioned at end, and the surface of revolution part of rolling process medial end portions contacts with crankshaft journal roll extrusion salient line.
2. a kind of crankshaft journal linearity antidote as claimed in claim 1, is characterized in that: the radius of curvature R of the surface of revolution part of described supporting roller end
lvalue be,
R
L＝τ/2+L/τ，
Wherein, τ refers to the height of maximum roll extrusion projection, the development length that L is protruding after referring to roll extrusion.
3. a kind of crankshaft journal linearity antidote as claimed in claim 2, is characterized in that: the value of development length L protruding after described roll extrusion is,
L＝R+[R
2+(R-h)
2]
0.5，
Wherein, R refers to roller radius of corner, and h refers to depth of cup.
4. a kind of crankshaft journal linearity antidote as described in above-mentioned arbitrary claim, is characterized in that: the value of the action t of the surface of revolution part of described supporting roller end is t=2 τ,
Wherein τ refers to the height of maximum roll extrusion projection.
5. a kind of crankshaft journal linearity antidote as claimed in claim 4, is characterized in that: the value of the length B2 of the column part in the middle part of described supporting roller is,
B2＝B1-n×L，
Wherein, B1 refers to the total length of supporting roller, the development length that L is protruding after referring to roll extrusion, and n value is 3 ~ 5.
6. a kind of crankshaft journal linearity antidote as claimed in claim 5, it is characterized in that: described n value is 4, the value of the length B2 of the column part in the middle part of supporting roller is, B2=B1-4 × L.
7. a kind of crankshaft journal linearity antidote as claimed in claim 5, is characterized in that: the value of the diameter d of the column part in the middle part of described supporting roller is,
d＝m+(D+R)/m，
Wherein, m refers to roller diameter, and D refers to crankshaft journal diameter, and R refers to roller radius of corner.
8. a kind of crankshaft journal linearity antidote as claimed in claim 7, it is characterized in that: described m value is 16, the value of the diameter d of the column part in the middle part of supporting roller is,
d＝16+(D+R)/16。
9. a kind of crankshaft journal linearity antidote as claimed in claim 3, it is characterized in that: the value of the height τ of described maximum roll extrusion projection is 0.01 ~ 0.03mm, the value of development length L protruding after roll extrusion is 4 ~ 6mm, and the value of depth of cup h is 0.05 ~ 0.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510021436.3A CN104646457A (en) | 2015-01-16 | 2015-01-16 | Crankshaft journal straightness correcting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510021436.3A CN104646457A (en) | 2015-01-16 | 2015-01-16 | Crankshaft journal straightness correcting method |
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| Publication Number | Publication Date |
|---|---|
| CN104646457A true CN104646457A (en) | 2015-05-27 |
Family
ID=53238383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510021436.3A Pending CN104646457A (en) | 2015-01-16 | 2015-01-16 | Crankshaft journal straightness correcting method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1442344A (en) * | 1973-10-13 | 1976-07-14 | Brown Tractors Ltd | Method of treating crankshafts |
| CN101180142A (en) * | 2005-04-07 | 2008-05-14 | 万国引擎知识产权有限责任公司 | Method for straightening an eccentric shaft |
| CN201227736Y (en) * | 2008-06-15 | 2009-04-29 | 李建民 | Bent shaft fillet rolling straightening machine |
| CN101704038A (en) * | 2009-11-27 | 2010-05-12 | 中国北车集团大连机车车辆有限公司 | Filleted corner knocking method for straightening crank shaft |
| CN103534048A (en) * | 2010-12-23 | 2014-01-22 | 黑根沙伊特-Mfd有限公司及两合公司 | Method for the roller-straightening of crankshafts |
-
2015
- 2015-01-16 CN CN201510021436.3A patent/CN104646457A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1442344A (en) * | 1973-10-13 | 1976-07-14 | Brown Tractors Ltd | Method of treating crankshafts |
| CN101180142A (en) * | 2005-04-07 | 2008-05-14 | 万国引擎知识产权有限责任公司 | Method for straightening an eccentric shaft |
| CN201227736Y (en) * | 2008-06-15 | 2009-04-29 | 李建民 | Bent shaft fillet rolling straightening machine |
| CN101704038A (en) * | 2009-11-27 | 2010-05-12 | 中国北车集团大连机车车辆有限公司 | Filleted corner knocking method for straightening crank shaft |
| CN103534048A (en) * | 2010-12-23 | 2014-01-22 | 黑根沙伊特-Mfd有限公司及两合公司 | Method for the roller-straightening of crankshafts |
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Effective date of abandoning: 20171003 |