CN102154541A - Method for intensifying Cr-Mo alloy cast iron thin-wall cylinder liner - Google Patents
Method for intensifying Cr-Mo alloy cast iron thin-wall cylinder liner Download PDFInfo
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- CN102154541A CN102154541A CN 201110061569 CN201110061569A CN102154541A CN 102154541 A CN102154541 A CN 102154541A CN 201110061569 CN201110061569 CN 201110061569 CN 201110061569 A CN201110061569 A CN 201110061569A CN 102154541 A CN102154541 A CN 102154541A
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- cylinder liner
- flange
- cylinder sleeve
- cylinder
- iron thin
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 229910001018 Cast iron Inorganic materials 0.000 title abstract description 3
- 229910001182 Mo alloy Inorganic materials 0.000 title abstract 2
- 238000009750 centrifugal casting Methods 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 238000001125 extrusion Methods 0.000 claims description 21
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 238000005728 strengthening Methods 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract description 2
- 230000007704 transition Effects 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 abstract 5
- 230000002349 favourable effect Effects 0.000 abstract 2
- 238000005266 casting Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 230000001550 time effect Effects 0.000 description 1
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- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a method for intensifying a Cr-Mo alloy cast iron thin-wall cylinder liner. A cylinder liner blank piece with a flange matched with a box body is cast by the centrifugal technology and is mechanically processed; an outward and upward bearing surface which forms a taper angle of 5-30' with the horizontal surface is processed on the lower end surface of the flange; and dedicated rolling equipment is adopted for locally intensifying and rolling the lower end surface of the flange and a transition fillet on the excircle of the cylinder liner by a rolling force. In the method, the required working procedures are few, the cost is low, and the tissue of the material of the centrifugal casting cylinder liner is even and refined; the lower end of the flange of the cylinder liner is provided with a bearing surface structure to improve the bearing capability of the cylinder liner and improve the stressed state, and the cylinder liner is easier to press when being stressed and is favorable to expansion if being heated and expanded, thereby preferably realizing effective sealing; a special rolling force and dedicated rolling fillet equipment are adopted to increase the surface prestressing force, thus being favorable for eliminating the phenomenon of stress concentration because of local processing tool marks; the bearing capability of the cylinder liner is improved; and the tearing tendency is lowered.
Description
Technical field
The present invention relates to a kind of production method of cylinder sleeve, a kind of specifically enhancement method of Cr-Mo cast alloy iron thin-walled diesel cylinder sleeve.
Background technology
Existing Cast iron liner, the general Cr-Mo cast alloy iron that adopts is cast, the structure of cylinder sleeve is a kind of flanged cylinder-like structure, the flange of cylinder sleeve cooperates with engine housing, flange is a circular ring, the upper and lower end face of flange is the plane, and the external cylindrical surface transition position of lower surface and cylinder sleeve is designed to fillet structure.The producing and manufacturing technique of cylinder sleeve is: at first adopt conventional cast method such as sand mold casting to cast out cylinder liner blank spare, then to blank through mechanical processing process such as polishing, machining, thermal treatments, manufacture cylinder sleeve.Use common casting processing method casting to form the interior tissue skewness of cylinder sleeve, deform because of discontinuity easily; And existing cylinder sleeve is on being assembled in engine housing the time, cylinder sleeve is connected on the casing by flange is compacted; thin-wall cylinder casing is easy to generate bigger deflection, and bigger surface stress will be born in the external cylindrical surface junction of flange and cylinder sleeve, in use is easy to produce cracking.In order to increase the intensity of cylinder sleeve, general way is the wall thickness that increases cylinder sleeve, can cause cylinder sleeve internal diameter and volumetrical to reduce so again, thereby greatly reduce the supporting capacity of cylinder sleeve, so the cylinder power that common cylinder sleeve allows is lower, the power coverage is little.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of method of the Cr-Mo of reinforcement cast alloy iron thin-wall cylinder casing.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
A kind of enhancement method of Cr-Mo cast alloy iron thin-wall cylinder casing, adopt centrifugal casting technique to cast out cylinder liner blank spare with the flange that cooperates with casing, blank is carried out mechanical workout, the flange lower surface is processed the supporting surface horizontal by 5 '～30 ' cone angle that outwards makes progress, adopt special-purpose roll unit that the knuckle at flange lower surface and cylinder sleeve cylindrical place is used
Roll extrusion power is carried out the local strengthening roll extrusion.
Further improvement of the present invention is: described cone angle is 6 '～20 '.
Further improvement of the present invention is: described roll extrusion power is
Because the technical progress of having adopted technique scheme, the present invention to obtain is:
Process improves the intensity of cylinder sleeve to the improvement of the complete processing and the structure of cylinder sleeve greatly, thereby increases supporting capacity, raising cylinder sleeve cylinder power.For determining technical scheme of the present invention, the contriver has designed different experimental programs, from manufacturing experimently, detect, verify, estimate the final state of determining, has successively experienced nearly 6 years, and company has dropped into great amount of manpower and material resources.Cylinder flange lower surface cone angle can exert an influence to the radial deformation of cylinder sleeve, and then influence the tensile stress of cylinder sleeve, the lower surface is plane or negative angle angle even too small radial-deformation and the tensile stress that all can aggravate cylinder sleeve of cone angle, be one of cylinder-liner distortion major reason of producing potential faults unusually, so the present invention verify out rational angle of taper by experiment.Be the influence of the lower plane cone angle of determining cylinder flange to the cylinder-liner distortion amount, the applicant has made the cylinder sleeve sample of many different cone angle schemes respectively, and carried out the deflection detection, the similarities and differences of contrast different cone angle design, find the flange lower surface horizontal by 5 '～30 ' cone angle that outwards makes progress has the effect that reduces cylinder-liner distortion, the cone angle of lower surface be 6 '～20 ' time effect best.Use roll extrusion fillet technology, the cylinder sleeve fillet is carried out local strengthening, can increase fillet part site surface prestress, help eliminating local stress concentration phenomenon because of the generation of processing tool marks, improve the supporting capacity of cylinder sleeve, but the size of roll extrusion power is also influential to the reinforcement of cylinder sleeve.For determining the size of roll extrusion power, the contriver finally determines the scheme and the optimum data of the effect that possesses skills of the present invention to more than totally 1000 part in roll extrusion power image data sample.Because the cylinder sleeve process-cycle is long, difficulty is big, more than the direct generation expense of two tests reach 70 surplus ten thousand yuan.In addition, checking work can not directly be estimated by the detection to product, must carry out the stand examination, has only by the comparative analysis to precision measurement data and diesel engine performance before and after the different roll extrusion power cylinder sleeve tests, could finally determine the roll extrusion force parameter.The contriver successively utilizes two diesel engine to carry out 1000 hours reliability tests, about 2,000,000 yuan of testing expenses.
Operation required for the present invention is less, and cost is lower, by adopting the Technology of common rotary casting, makes Cr-Mo cast alloy iron cylinder sleeve obtain the material structure and the necessary mechanical property of more evenly refinement; On the basis of ripe cylinder sleeve, increase cone angle supporting surface structure in the cylinder flange lower end, guarantee certain cylinder sleeve support angle by suitable mechanical workout, improve the cylinder sleeve supporting capacity, improved strained condition, make easier compressing when stressed, stronger during expanded by heating in flexible, can realize effective sealing better; By adopting specific roll extrusion power and special-purpose roll extrusion fillet equipment, increased surperficial prestress, help eliminating local stress concentration phenomenon because of the generation of processing tool marks, improved the supporting capacity of cylinder sleeve, reduced fracture tendency.By design and sport car checking, the cylinder sleeve that utilizes the present invention to produce can satisfy product requirement, reaches than the higher strengthening effect of common Cr-Mo cast alloy iron thin-wall cylinder casing, is applicable to powerful diesel motor.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the A place partial enlarged drawing of Fig. 1.
Wherein, 1, flange, 2, supporting surface, 3, knuckle, 4, cylinder sleeve.
Embodiment
Below in conjunction with embodiment the present invention is described in further details:
A kind of enhancement method of Cr-Mo cast alloy iron thin-wall cylinder casing, rotary casting goes out to have the cylinder liner blank spare of the flange 1 that cooperates with casing, cylinder liner blank spare is carried out mechanical workout, the flange lower surface is processed the supporting surface 2 horizontal by 5 ' cone angle that outwards makes progress, adopt knuckle 3 usefulness of special-purpose roll unit cylinder sleeve
Roll extrusion power is carried out the local strengthening roll extrusion.
A kind of another kind of embodiment of enhancement method of Cr-Mo cast alloy iron thin-wall cylinder casing processes the supporting surface 2 horizontal by 20 ' cone angle that outwards makes progress with the flange lower surface, adopts knuckle 3 usefulness of special-purpose roll unit to cylinder sleeve
Roll extrusion power is carried out the local strengthening roll extrusion.
A kind of another kind of embodiment of enhancement method of Cr-Mo cast alloy iron thin-wall cylinder casing processes the supporting surface 2 horizontal by 30 ' cone angle that outwards makes progress with the flange lower surface, adopts knuckle 3 usefulness of special-purpose roll unit to cylinder sleeve
Roll extrusion power is carried out the local strengthening roll extrusion.
Certainly, any angle in the protection domain of requirement of the present invention and roll extrusion power all have the strengthening effect to cylinder sleeve.
Claims (3)
1. the enhancement method of a Cr-Mo cast alloy iron thin-wall cylinder casing, it is characterized in that: adopt centrifugal casting technique to cast out cylinder liner blank spare with the flange (1) that cooperates with casing, blank is carried out mechanical workout, the flange lower surface is processed the supporting surface horizontal by 5 '～30 ' cone angle (2) that outwards makes progress, adopt special-purpose roll unit that the knuckle (3) at flange lower surface and cylinder sleeve cylindrical place is used
Roll extrusion power is carried out the local strengthening roll extrusion.
2. the enhancement method of Cr-Mo cast alloy iron thin-wall cylinder casing according to claim 1 is characterized in that: described cone angle is 6 '～20 '.
3. the enhancement method of Cr-Mo cast alloy iron thin-wall cylinder casing according to claim 1 and 2 is characterized in that: described roll extrusion power is
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110061569 CN102154541B (en) | 2011-03-15 | 2011-03-15 | Method for intensifying Cr-Mo alloy cast iron thin-wall cylinder liner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110061569 CN102154541B (en) | 2011-03-15 | 2011-03-15 | Method for intensifying Cr-Mo alloy cast iron thin-wall cylinder liner |
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| Publication Number | Publication Date |
|---|---|
| CN102154541A true CN102154541A (en) | 2011-08-17 |
| CN102154541B CN102154541B (en) | 2012-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110061569 Active CN102154541B (en) | 2011-03-15 | 2011-03-15 | Method for intensifying Cr-Mo alloy cast iron thin-wall cylinder liner |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2860722Y (en) * | 2006-01-16 | 2007-01-24 | 洛阳河柴发动机有限责任公司 | Cylinder Liner Sinking Cutting Groove Rolling Device |
-
2011
- 2011-03-15 CN CN 201110061569 patent/CN102154541B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2860722Y (en) * | 2006-01-16 | 2007-01-24 | 洛阳河柴发动机有限责任公司 | Cylinder Liner Sinking Cutting Groove Rolling Device |
Non-Patent Citations (3)
| Title |
|---|
| 《内燃机配件》 19951231 覃正光 滚压技术在气缸套加工中的应用 23-26 1-3 , 第2期 * |
| 《车用发动机》 19831231 克鲁谢斯克 制造公差和圆角半径对缸体缸套支承面应力的影响 45-49、22 1-3 , 第6期 * |
| 《铸造》 20090831 郝巧玲等 铸造工艺及合金元素对气缸套切削性能的影响 846-848 1-3 第58卷, 第8期 * |
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| CN102154541B (en) | 2012-12-05 |
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