CN1445050A - Round corner rolling depression method for crankshaft of engines - Google Patents
Round corner rolling depression method for crankshaft of engines Download PDFInfo
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- CN1445050A CN1445050A CN 03119018 CN03119018A CN1445050A CN 1445050 A CN1445050 A CN 1445050A CN 03119018 CN03119018 CN 03119018 CN 03119018 A CN03119018 A CN 03119018A CN 1445050 A CN1445050 A CN 1445050A
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- Prior art keywords
- roll extrusion
- crankshaft
- rolling
- fillet
- engines
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- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
A rolling-pressing technology for treating the fillet of crankshaft of engine features that the roller whose radius is smaller than the fillet radius is used for rolling. It can increase the bend fatigue strength of crankshaft by 11% of more.
Description
Technical field: the invention belongs to internal combustion engine system technology for making field, relate in particular to a kind of fillet rolling and reinforcing technology of generator bent axle.
Background technology: fillet rolling is a kind of special process in the bent axle processing, its effect is that bent axle is strengthened, improve its bearing capacity, compare with other modes, it is low that fillet rolling and reinforcing has a cost, advantages such as efficient height and strengthening effect are remarkable, the amplitude that fillet rolling can make crankshaft bending fatigue intensity improve usually can reach more than 80%, far above present existing other schedule of reinforcements, thereby it is increasingly extensive that it is used in automobile engine crankshaft, but, along with improving constantly of engine detonation pressure, the live load of bent axle is increasing, and at this moment, the bent axle that adopts conventional round corner rolling process to produce has been difficult to satisfy the high reliability request of engine, therefore, need the new round corner rolling process of exploitation further to improve the bearing capacity of bent axle.
Summary of the invention: the present invention adopts conventional round corner rolling process to be difficult to satisfy the problem of engine to the reliability requirement of bent axle in order to solve, propose a kind of fillet rolling method of engine crankshaft, this method is to adopt radius of corner to carry out roll extrusion less than the roller of conventional rolling technology.Through the bent axle that this rolling technology method is handled, the more conventional rolling technology of its bending fatigue limit can improve more than 11%.
The specific embodiment: the present invention adopts unconventional rolling technology condition that engine crankshaft is strengthened, and promptly adopts radius of corner to carry out roll extrusion less than the roller of conventional rolling technology.Adopting this method can be directly to adopt unconventional process conditions to carry out a roll extrusion; Also can adopt twice roll extrusion, at first adopt the technological parameter of conventional roll extrusion or approximate conventional roll extrusion to carry out the roll extrusion first time, the conversion process condition is carried out the unconventional roll extrusion second time then.Specifically can be undertaken by following technological process:
Roughing---fine finishining---fillet rolling---roll extrusion is more straight---polishing or: roughing---fine finishining---fillet rolling---fillet rolling---roll extrusion is more straight---polishing for the second time for the first time.
Rolling step can be finished on general or special purpose crankshaft fillet roller press, and all the other operations are not had specific (special) requirements, and specific embodiment is as follows:
Embodiment one
Cummins 6BT spherulitic iron crankshaft
Material: QT700-2;
Reinforcement process: the two finish rolling hardenings of fillet, roller radius R=2.5 millimeter
Strengthening effect relatively sees Table 1:
Two kinds of reinforcement process effect contrast tables of table 1 embodiment one
Embodiment two EQD6105T spherulitic iron crankshaft material: QT700-2; Reinforcement process: single roll extrusion, roller radius R=2.5 millimeter strengthening effect relatively sees Table 2:
| Treatment process | Conventional fillet rolling | The two roll extrusion of fillet |
| Bending fatigue limit moment of flexure (Nm) | ????2325 | ????2583 |
| Fatigue limit increase rate (%) | ????0 | ????11.1 |
Two kinds of reinforcement process effect contrast tables of table 2 embodiment two
| Treatment process | Conventional fillet rolling | Single roll extrusion |
| Bending fatigue limit moment of flexure (Nm) | ????2521 | ????2839 |
| Fatigue limit increase rate (%) | ????0 | ????12.6 |
Claims (3)
1, a kind of fillet rolling method of engine crankshaft, this method are to adopt radius of corner to carry out roll extrusion less than the roller of conventional rolling technology.
2, the fillet rolling method of engine crankshaft as claimed in claim 1 can be also can be twice roll extrusion by a roll extrusion of described method.
3, the fillet rolling method of engine crankshaft as claimed in claim 2 is characterized in that: described twice roll extrusion is at first to adopt the technological parameter of conventional roll extrusion or approximate conventional roll extrusion to carry out the roll extrusion first time, and the conversion process condition is by described method roll extrusion then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03119018 CN1445050A (en) | 2003-04-30 | 2003-04-30 | Round corner rolling depression method for crankshaft of engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03119018 CN1445050A (en) | 2003-04-30 | 2003-04-30 | Round corner rolling depression method for crankshaft of engines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1445050A true CN1445050A (en) | 2003-10-01 |
Family
ID=27815000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03119018 Pending CN1445050A (en) | 2003-04-30 | 2003-04-30 | Round corner rolling depression method for crankshaft of engines |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1445050A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108591241A (en) * | 2018-08-01 | 2018-09-28 | 广西玉柴机器股份有限公司 | V-type diesel bent axle |
| CN108591240A (en) * | 2018-08-01 | 2018-09-28 | 广西玉柴机器股份有限公司 | The medium-and-large-sized nodular graphite cast iron crankshaft of diesel engine of high pressure-charging |
-
2003
- 2003-04-30 CN CN 03119018 patent/CN1445050A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108591241A (en) * | 2018-08-01 | 2018-09-28 | 广西玉柴机器股份有限公司 | V-type diesel bent axle |
| CN108591240A (en) * | 2018-08-01 | 2018-09-28 | 广西玉柴机器股份有限公司 | The medium-and-large-sized nodular graphite cast iron crankshaft of diesel engine of high pressure-charging |
| CN108591240B (en) * | 2018-08-01 | 2023-11-07 | 广西玉柴机器股份有限公司 | Nodular cast iron crankshaft of high-supercharging medium-large diesel engine |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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