CN105081692B - A kind of processing method of the gradual change type strength structure of piston of high power diesel engine pin oilhole - Google Patents
A kind of processing method of the gradual change type strength structure of piston of high power diesel engine pin oilhole Download PDFInfo
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- CN105081692B CN105081692B CN201510469795.5A CN201510469795A CN105081692B CN 105081692 B CN105081692 B CN 105081692B CN 201510469795 A CN201510469795 A CN 201510469795A CN 105081692 B CN105081692 B CN 105081692B
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- carburizing
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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
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J1/00—Pistons; Trunk pistons; Plungers
- F16J1/10—Connection to driving members
- F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
- F16J1/16—Connection to driving members with connecting-rods, i.e. pivotal connections with gudgeon-pin; Gudgeon-pins
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The present invention relates to piston of high power diesel engine pin technical field, especially a kind of processing method of piston of high power diesel engine pin oilhole gradual change type strength structure.Step 1：Oilhole before carburizing is first finished in advance, the cylindrical strengthening layer surplus of piston pin is reserved.Step 2：Piston pin carries out comprehensive carburizing, controls the case depth of outer surface；And control diffusion phase.Step 3：Machining：Expand oilhole, control aperture rounding off mutually passes through face, reserves depth of penetration ratio.Step 4：Quenching：The quench-hardened case that oilhole outer surface continues is formed in precalculated position, keeps fillet R places to obtain effective quench-hardened case along the internally intensity gradual change of fillet R roundings corner contours；Intensity region is kept after some scale, and tough ratio is leading excessive to toughness.The present invention makes oil hole structure obtain gradual change strength layer, and while the cylindrical holding high intensity of piston pin, high-wearing feature, oilhole extends inward direction and obtains quench-hardened case of along the rounding corner contours gradual change, strength and toughness by change.
Description
Technical field
The present invention relates to piston of high power diesel engine pin technical field, especially a kind of piston of high power diesel engine pin oilhole
The processing method of gradual change type strength structure.
Background technology
Piston of high power diesel engine pin is general to have very high surface abrasion resistance, the heart due to the high request of its military service operating mode
Portion's organization mechanicses performance and a series of requirements such as processing structure, dimensional accuracy.The important component in use, often goes out current situation
The problems of serious failure such as portion's cracking, its cylindrical position oilhole intersection easily causes stress concentration and turns into formation of crack.
Conventional method is typically using improvement selection, the increasing structure such as oilhole intersection chamfering or rounding, or use carburizing
Quenching obtains local strengthening, and reinforced structure and tenacity effect are as shown in Figure 1, 2.These methods especially drawback：In material
Under energy limit is limited with processing cost, chamfering is only capable of eliminating part stress concentration, strongly limit the nominal power of diesel engine；Quench
Hard formation continues along oilhole surface, unavoidably increases fragility, reduction toughness and plasticity, in high-power alternate load stress collection
Under conditional, quench-hardened case crackle is easily produced.
The content of the invention
In order to overcome the shortcomings of existing technology, the invention provides a kind of piston of high power diesel engine pin oilhole gradual change type
The processing method of strength structure.
The technical solution adopted for the present invention to solve the technical problems is：A kind of piston of high power diesel engine pin oilhole gradual change
The processing method of formula strength structure：
Step 1：Oilhole before carburizing is first finished in advance, the cylindrical strengthening layer surplus of piston pin is reserved；
Step 2：Comprehensive carburizing is carried out to piston pin, after full case-carbonizing, carburized layer uniformly divides along oilhole all outer surfaces
Cloth, is now controlled to the case depth of outer surface, carburized (case) depth is reached piston pin depth of penetration technical requirements；
The control in stage is diffused simultaneously, diffusion phase is mainly the cooling in carburizing later stage, more than 900 DEG C of carburizing temperature is reduced
To 750-880 DEG C of tapping temperature, the time is no less than 30min, carries out carburizing post drop；To oilhole periphery rounding corner contours
Carburized layer then carries out following procedure；
Step 3：Machining：The internal diameter of oilhole is enlarged, oilhole formation aperture rounding off after processing is mutually passed through face,
Such phase, which passes through face, can reserve certain remaining infiltration layer, and the depth of penetration of its depth and outer round surface keeps certain ratio；
Step 4：Quenching：The quench-hardened case that oilhole outer surface continues is formed in precalculated position, keeps piston pin cylindrical and oilhole
The effective quench-hardened case obtained along the internally intensity gradual change of fillet R roundings corner contours is mutually acted at the fillet R at the place of passing through；Intensity region is kept
After some scale, tough ratio is leading excessive to toughness.
According to another embodiment of the invention, further comprise, the phase passes through face depth of penetration for outer round surface infiltration layer
0.4-0.8 times of depth.
According to another embodiment of the invention, further comprise, the oilhole finishes depth in advance will for drawing technology
Seek regulation depth of penetration 1.5-4.5 times.
The beneficial effects of the invention are as follows the present invention makes oil hole structure obtain gradually using the technological process of cold and hot Combined process
Intensity adjustable layer, while the cylindrical holding high intensity of piston pin, high-wearing feature, oilhole extends inward direction and obtained along rounding
Profile gradual change, strength and toughness can effectively solve the above problems by the quench-hardened case of change.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the schematic diagram of the common reinforced structure of piston pin oilhole.
Fig. 2 is intensity and change in toughness figure of the common reinforced structure of oilhole from surface to center portion.
Fig. 3 is the schematic diagram of gradual change type strength structure of the present invention.
Fig. 4 is intensity and change in toughness figure of the gradual change type strength structure of the present invention from surface to center portion.
1, oilhole in figure, 2, stress concentration（Failure）Point, 3, alternate stress area, 4, quench-hardened case, R, fillet, a, intensity, b,
Toughness.
Embodiment
Oil hole machine processing entire flow before carburizing is mainly as follows：
A) it is rough turn:Turning and both ends of the surface φ 110-125 × 200-219, equipment：C630 lathes, regular turning tool；
b）Smart car：Turning and both ends of the surface φ 105-123 × 200-215, rounding R1, equipment：CK7525 numerically controlled lathes,
Regular turning tool, frock：R is advised（R0.5--8）；Boring central through hole φ 34-38, Common boring cutter, orifice chamfer, frock：φ 35 is only logical
Rule（GE84-JE8-01）.
c）Drilling：Processing excircles hole（Its last shaping is referring to Fig. 3, i.e., what the invention of this reality was signified has gradual change type intensity knot
The piston pin oilhole of structure）：Cylindrical upper brill 12- φ 8-10 holes, normal drill bit, aperture milling fillet R2-4.5, special molding milling cutter,
HSV1150 vertical machining centres, horizontal hole tool GE84-JE71-21, φ 8-11 stop drift GE84-JE8-03 R rule
（R0.5--8）.
Machining only need to be under normal temperature condition（Interior, 0-40 DEG C）It can carry out, the time cycle has no special requirements（By normal
Work step is completed）.It is above-mentioned by GE84-JE series exemplified by, other similar frock figure numbers and unit type and above-mentioned processing method
It is identical, it will not be repeated here.
The present invention makes oil hole structure obtain gradual change strength layer, outside piston pin using the technological process of cold and hot Combined process
Circle keep high intensity, high abrasion while, hole extend inward direction obtain along rounding corner contours gradual change, strength and toughness by
The quench-hardened case of change.
It is as follows to obtain a kind of quench-hardened case processing method of the invention：
（1）Before carburizing, oilhole is finished in advance, machine-tooled method as mentioned above.
（2）Surface complete to piston pin carries out carburizing.Complete after pre- finishing, workpiece is subjected to full case-carbonizing：Carburizing temperature
900-920 DEG C of degree, carburizing cycle 12-18h, carbon potential 1.0-1.3, equipment：The common well formula with carbon-potential control or box carburizing
Stove.
Full case-carbonizing, carburized layer is uniformly distributed along oilhole all outer surfaces, now to the case depth of outer surface
It is controlled, carburized (case) depth is reached piston pin depth of penetration technical requirements；The control in stage is diffused simultaneously：By 900
Carburizing temperature more than DEG C is reduced to 750-880 DEG C of tapping temperature, and the time is no less than 30min, then carries out carburizing later stage drop
Temperature, come out of the stove.
（3）The carburized layer of control oilhole periphery rounding R profiles after comprehensive carburizing, by subsequently machining -- flared end and edge
The processing to oilhole depth of piston pin radial direction, changes the residual of carburized layer.
Flared end technique：Equipment：HSV1150 machining centers, bore 12- φ 8.5-12 holes, normal drill bit, aperture milling fillet
R2-3, profile milling cutter, horizontal hole tool GE84-JE71-23, φ 8.5-12 stop drift GE84-JE8-05.
When the internal diameter by machining to oilhole is enlarged, control oilhole mouthful rounding off, which mutually passes through face, reserves infiltration layer depth
Degree ratio, depth of penetration ratio is gradual change, and the proportion for controlling gradual change is：Oilhole finishes depth in advance will for drawing technology
Seek regulation depth of penetration 1.5-4.5 times, with the reaming and deep processing of the follow-up oilhole of carburizing, the remaining carburized layer of hole side wall exists
Certain size（Reserved oilhole is finished in depth in advance）Keep and be then gradually reduced to elimination.Aperture is formed after processing round and smooth
Transitional face passes through face, and such phase, which passes through face, can reserve certain remaining infiltration layer, the depth of penetration holding of its depth and outer round surface
Certain ratio, is 0.4-0.8 times of outer round surface depth of penetration.
（4）Carry out quenching process.Overall heating, 800-820 DEG C of insulation 2.5- are carried out using common batch-type furnace or shaft furnace
3.5h, using oil quenchinng（Overall quenching）, subsequent 150-250 DEG C of insulation 2.5-4h tempering.
Provide to require the quench-hardened case of piston pin outer round surface formation outer surface hardened in drawing, keep at rounding R
To effective quench-hardened case along the internally intensity gradual change of rounding R profiles.Position of being hardened after quenching obtains intensity region, such as Fig. 3 institutes
Show.Intensity region keeps some scale（Refer to 1.5-4.5 times of effective depth of hardening）Afterwards, tough ratio was dominated to toughness
Degree, as shown in Figure 4.
The present invention is finished in advance before machining to oilhole, reserves the surplus of cylindrical strengthening layer.And conventional machining
Method oilhole is processed in carburizing front portion, or only retains location dimples, and size is not limited and without depth requirements.Oilhole periphery of the present invention
Rounding corner contours carburized layer changes the residual of carburized layer by follow-up processing, so, can obtain all edge rounding wheels of oilhole
The quench-hardened case of gradual change is obtained after the carburized layer of wide gradual change, quenching.The present invention can effectively solve to live under the conditions of high-power alternate load
Plug pin is easy to the problems of serious failure such as the Filleted angle on oil hole Local Cracking occurred.
Claims (3)
1. a kind of processing method of piston of high power diesel engine pin oilhole gradual change type strength structure, it is characterized in that：
Step 1：Oilhole before carburizing is first finished in advance, the cylindrical strengthening layer surplus of piston pin is reserved；
Step 2：Comprehensive carburizing is carried out to piston pin, after comprehensive carburizing, carburized layer is uniformly distributed along oilhole all outer surfaces, now
The case depth of outer surface is controlled, carburized (case) depth is reached piston pin depth of penetration technical requirements；Enter simultaneously
The control of row diffusion phase：More than 900 DEG C of carburizing temperature is reduced to 750-880 DEG C of tapping temperature, the time is no less than
30min, carries out carburizing post drop；Following procedure is then carried out to the carburized layer of oilhole periphery rounding corner contours；
Step 3：Machining：The internal diameter of oilhole is enlarged, oilhole formation aperture rounding off after processing is mutually passed through face, so
Mutually pass through face and can reserve certain remaining infiltration layer, the depth of penetration of its depth and outer round surface keeps certain ratio；
Step 4：Quenching：The quench-hardened case that oilhole outer surface continues is formed in precalculated position, keeps that piston pin is cylindrical mutually to be passed through with oilhole
Risen at the fillet R at place, obtain effective quench-hardened case along the internally intensity gradual change of fillet R roundings corner contours；Intensity region keeps one
After dimensioning, tough ratio dominates transition to toughness.
2. the processing method of piston of high power diesel engine pin oilhole gradual change type strength structure according to claim 1, it is special
Levying is, the phase passes through 0.4-0.8 times that face depth of penetration is outer round surface depth of penetration.
3. the processing method of piston of high power diesel engine pin oilhole gradual change type strength structure according to claim 1, it is special
Levying is, some scale refers to that drawing technical requirements provide 1.5-4.5 times of depth of penetration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510469795.5A CN105081692B (en) | 2015-08-04 | 2015-08-04 | A kind of processing method of the gradual change type strength structure of piston of high power diesel engine pin oilhole |
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| CN201510469795.5A CN105081692B (en) | 2015-08-04 | 2015-08-04 | A kind of processing method of the gradual change type strength structure of piston of high power diesel engine pin oilhole |
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| CN105081692B true CN105081692B (en) | 2017-07-11 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105583083A (en) * | 2015-12-29 | 2016-05-18 | 艾尼科环保技术(安徽)有限公司 | Machining technological method for cathode vibrating and hitting pin wheel pin of electric dust collector |
| CN107955874B (en) * | 2017-11-22 | 2020-09-04 | 株洲市九洲传动机械设备有限公司 | Shaft part with surface local quenching transition area and machining process thereof |
| CN107825087B (en) * | 2017-12-12 | 2019-11-22 | 盛瑞传动股份有限公司 | A kind of piston pin roughing technique |
| CN109339971B (en) * | 2018-12-10 | 2020-04-28 | 广西玉柴机器股份有限公司 | Laser-hardened main bearing cap and method for manufacturing same |
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| EP0269422A3 (en) * | 1986-11-28 | 1989-05-24 | Ford Motor Company Limited | Engine crankshaft |
| CN101358269A (en) * | 2008-09-05 | 2009-02-04 | 潍坊潍柴零部件机械有限公司 | Carburizing quenching pipeline and technique thereof |
| CN102776471A (en) * | 2012-07-10 | 2012-11-14 | 镇江中船设备有限公司 | Carburizing quenching technology for low-carbon alloy steel parts |
| CN202883144U (en) * | 2012-10-26 | 2013-04-17 | 株洲湘火炬机械制造有限责任公司 | Novel piston pin |
| CN104481719A (en) * | 2014-11-21 | 2015-04-01 | 余姚市舒春机械有限公司 | Cold-extruded high-precision gasoline engine piston pin |
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2015
- 2015-08-04 CN CN201510469795.5A patent/CN105081692B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0269422A3 (en) * | 1986-11-28 | 1989-05-24 | Ford Motor Company Limited | Engine crankshaft |
| CN101358269A (en) * | 2008-09-05 | 2009-02-04 | 潍坊潍柴零部件机械有限公司 | Carburizing quenching pipeline and technique thereof |
| CN102776471A (en) * | 2012-07-10 | 2012-11-14 | 镇江中船设备有限公司 | Carburizing quenching technology for low-carbon alloy steel parts |
| CN202883144U (en) * | 2012-10-26 | 2013-04-17 | 株洲湘火炬机械制造有限责任公司 | Novel piston pin |
| CN104481719A (en) * | 2014-11-21 | 2015-04-01 | 余姚市舒春机械有限公司 | Cold-extruded high-precision gasoline engine piston pin |
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