CN108087141A - A kind of steel pistons and its manufacturing method - Google Patents
A kind of steel pistons and its manufacturing method Download PDFInfo
- Publication number
- CN108087141A CN108087141A CN201711334094.6A CN201711334094A CN108087141A CN 108087141 A CN108087141 A CN 108087141A CN 201711334094 A CN201711334094 A CN 201711334094A CN 108087141 A CN108087141 A CN 108087141A
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- Prior art keywords
- combustion chamber
- cover board
- piston
- steel pistons
- chamber cover
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/26—Pistons having combustion chamber in piston head
-
- 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
- B23P15/10—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
- F02F3/20—Pistons having cooling means the means being a fluid flowing through or along piston
- F02F3/22—Pistons having cooling means the means being a fluid flowing through or along piston the fluid being liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F2003/0007—Monolithic pistons; One piece constructions; Casting of pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F2200/00—Manufacturing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F2200/00—Manufacturing
- F02F2200/04—Forging of engine parts
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses a kind of steel pistons, in the bottom of combustion chamber structure being internally provided with piston cylinder one of piston body, and the middle body for making bottom of combustion chamber is raised to combustion chamber direction, combustion chamber cover board is designed as cyclic structure, and make combustion chamber cover board and piston body using the assembly and connection mode that inner ring and outer ring are threaded connection, form the cooling oil chamber of annular, the bottom of cooling oil chamber is equipped with into oil outlet, closely sealed weld seam is both provided on the outside of the auxiliary section of combustion chamber cover board and piston body, to form the integrated steel piston with inner-cooling oil recess.This programme provide steel pistons structure it is simple, it is easy to process, manufacture it is at low cost, the shaping of cooling oil chamber is simple, and combustion chamber coverplate stress is small, and inside and outside double thread connection mode is enough to ensure that combustion chamber cover board will not come off extremely during pistons work.The steel pistons of this programme disclosure satisfy that engine high power, high intensity and the requirement of low emission.The invention also discloses a kind of manufacturing methods of steel pistons.
Description
Technical field
The present invention relates to plunger designs processing technique field more particularly to a kind of steel pistons and its manufacturing methods.
Background technology
The development trend requirement miniaturization of engine, and power is required constantly to be promoted, explosion pressure alreadys exceed 20MPa,
Bearing piston, load is increasing, and to adapt to the development of engine, the designers of piston are constantly in the material and knot of piston
Improvement is designed on structure, to improve the performance of piston, elevated temperature strength and service life.Although traditional all-aluminium piston has weight
Measure the advantages of light, but aluminum alloy materials can only at 350 DEG C steady operation, greatest limit operating temperature be 400 DEG C, by
Engine high power, high intensity, the requirement of low emission cannot gradually be met, and Steel material piston greatest limit operating temperature is 520
DEG C, Steel material disclosure satisfy that the needs of high intensity piston, steel pistons are closed after aluminium due to its high intensity, high thermodynamic property
Another brand-new designing scheme after golden piston.Plunger designs person separately designed out steel top and aluminum skirt be bolted piston and
Steel top and aluminum skirt pendulum mass formula Hinged piston, but two kinds of piston structures are required for steel top and aluminium skirt separately manufactured, and piston skirt Wall-Thickness Difference is difficult
To ensure, foundary loss rate is high, and pendulum mass formula piston is difficult to form oil closed cavity, and piston cooling effect is poor.
Chinese patent CN100453253C discloses a kind of side by piston billet manufacture for the one-piece piston of engine
Method, in ring area, there are one the cooling tubes and a slot of closing for tool between ring zone and the piston body of the box-like.It should
Method comprises the following steps：Piston billet is manufactured by the method for forging, by fabricating the annular groove so that the piston skirt
Upper end can be kept connecting with the radial inner region under piston top.The axial height of the slot is at least equal to the cooling tube
Axial height.The cooling tube of the bottom opening is process by being machined and taking turns the method for interior boring, and finishes the work
The outer profile of plug.The cooling tube of the bottom opening is closed with the ring cowling of two parts.The shortcomings that technical solution, is as follows：First, machine
Tool difficulty of processing is big, is particularly limited by annular slot space, more high intensity complexity machine need to be added cutter just when processing cooling tube
It can complete, processed complex is of high cost；2nd, two ring cowlings assembling of the cooling tube of closing opening is extremely difficult.
Chinese patent CN1944994A discloses a kind of welded forged steel integrated piston and its manufacturing method.Manufacturing method
It is：Head and skirt section blank are forged respectively；Head and skirt section blank are heat-treated respectively；Respectively to head and skirt section hair
Base carries out roughing, and the welding surface in two adjacent annular groove of head is higher than the welding surface below combustion chamber：Head and skirt section are passed through
Friction welding is together；The annular groove of piston, combustion chamber, annular groove, pin hole, outer circle and into oil outlet are processed respectively；To piston
Surface carries out phosphatization or graphite treatment.Weld together after being forged respectively due to piston crown and skirt section, with solid forging
Piston compared to good manufacturability, due to forming closing cooling oil chamber by welding, increase piston overall structure rigidity, particularly
The hot lower deformation in annular groove position is smaller, and annular groove is processed above piston skirt, the weight of piston only is alleviated, is conducive to
The reduction of the oil return of oil ring groove location machine oil, the adjustment of cylinder prepareding gap and machine oil oil consumption.The shortcomings that technical solution, is as follows：By rubbing
The method for wiping weldering carries out soldering to piston crown and skirt section, easily forms the crator of surfaces externally and internally, is hidden in cooling oil chamber
Interior crator is difficult to remove, and when engine in the case of high-speed and high-temperature when running, crator drops risk, with cooling after dropping
Oil be easy to cause the quality accidents such as engine scuffing into positions such as engine-cooling systems.
The content of the invention
In order to overcome the shortcomings of prior art, the present invention provides a kind of new steel pistons and its manufacturing method,
The structure and manufacture craft for making steel pistons more simplify, and improve the reliability and security of pistons work, disclosure satisfy that and start
Machine high power, high intensity and the requirement of low emission.
To achieve these goals, the present invention provides following technical solutions：
A kind of steel pistons, including piston body and combustion chamber cover board, the piston body includes piston cylinder, coaxially connected in described
Bottom of combustion chamber inside piston cylinder and the axis pin connecting portion being connected to below the bottom of combustion chamber, the bottom of combustion chamber
Middle body be provided with to combustion chamber direction protrusion and in the periphery of the middle body the first external screw thread, the piston cylinder
Upper end inner ring be provided with the first internal thread, the combustion chamber cover board is cyclic structure, the upper end outer ring of the combustion chamber cover board
The second external screw thread with first screw-internal thread fit is provided with, the lower end inner ring of the combustion chamber cover board is provided with and described
Second internal thread of one external screw thread cooperation, the combustion chamber cover board are threadedly coupled with the bottom of combustion chamber and the piston cylinder
After cricoid cooling oil chamber is collectively formed, the cooling oil chamber bottom is provided with into oil outlet, first external screw thread and described
It is equipped on the outside of the auxiliary section of second internal thread and on the outside of first internal thread and the second externally threaded auxiliary section close
Close weld seam.
Preferably, in above-mentioned steel pistons, the upper end outer ring of the combustion chamber cover board and the upper end inner ring of the piston cylinder
Between be provided with top cooperation cylinder, top cooperation cylinder is located at first internal thread and externally threaded matches somebody with somebody with described second
The top in conjunction portion；Lower section is provided between the lower end inner ring of the combustion chamber cover board and the periphery of the middle body with zygostyle
Face, the lower section cooperation cylinder are located at first external screw thread and the top of the auxiliary section of second internal thread.
Preferably, in above-mentioned steel pistons, the closely sealed weld seam is welded by argon arc welding, beam-plasma, electron beam welds
It connects or LASER BEAM WELDING is formed.
Preferably, in above-mentioned steel pistons, the piston body is cast member or forge piece, and the combustion chamber cover board is forging
Part.
Preferably, in above-mentioned steel pistons, the periphery of the piston body is provided with multi-turn annular groove.
Steel pistons provided by the invention, in the bottom of combustion chamber structure being internally provided with piston cylinder one of piston body,
And make the middle body of bottom of combustion chamber that combustion chamber cover board are designed as cyclic structure, and made to combustion chamber direction protrusion
Combustion chamber cover board and piston body form annular cooling oil using the assembly and connection mode that inner ring and outer ring are threaded connection
Chamber, the bottom of cooling oil chamber are equipped with into oil outlet, and closely sealed weldering is both provided on the outside of the auxiliary section of combustion chamber cover board and piston body
Seam, to form the integrated steel piston with inner-cooling oil recess.
This programme provide steel pistons structure it is simple, it is easy to process, manufacture it is at low cost, the shaping of cooling oil chamber is simple,
Combustion chamber coverplate stress is small, and the bonding strength of inside and outside double thread connection mode is enough to ensure that combustion chamber cover board in pistons work process
In will not come off extremely, and the area that the position of closely sealed weld seam has effectively avoided chamber temperature highest and stress is concentrated the most
Domain, closely sealed weld stress is small, risk is low, can improve sealing performance and play the role of preventing from being threadedly coupled loosening, improve
Piston safety in utilization.The steel pistons of this programme disclosure satisfy that engine high power, high intensity and the requirement of low emission.
The present invention also provides a kind of manufacturing methods of steel pistons, comprise the following steps：
Machining piston chaeta base and combustion chamber cover board blank, the piston body blank include piston cylinder, coaxially connected in institute
The axis pin connecting portion stated the bottom of combustion chamber inside piston cylinder and be connected to below the bottom of combustion chamber, the combustion chamber bottom
The middle body in portion forms cold to combustion chamber direction protrusion, the outer perimeter section positioned at the middle body of the bottom of combustion chamber
But the bottom of oil pocket and processed in the bottom of the cooling oil chamber into oil outlet, the combustion chamber cover board is cyclic structure；
Heat treatment, is respectively heat-treated the piston body blank and the combustion chamber cover board blank；
Screw thread is processed, the first external screw thread is processed in the periphery of the middle body of the bottom of combustion chamber, in the piston
The upper end inner ring of cylinder processes the first internal thread, to form piston body, is processed in the upper end outer ring of the combustion chamber cover board blank
Going out can be with the second external screw thread of first screw-internal thread fit, and being processed in the lower end inner ring of the combustion chamber cover board blank can be with
Second internal thread of the first external screw thread cooperation, to form combustion chamber cover board, ensures the combustion chamber cover board and the piston
Its internal and external threads can be screwed into simultaneously when body is threadedly coupled screws；
Built-up piston, common shape after the combustion chamber cover board is threadedly coupled with the bottom of combustion chamber and the piston cylinder
The cooling oil chamber circlewise；
Closely sealed weld seam is processed, on the outside of the auxiliary section of first external screw thread and second internal thread and described first
The closely sealed sealing treatment of shallow-layer is carried out on the outside of internal thread and the second externally threaded auxiliary section.
Preferably, in the manufacturing method of above-mentioned steel pistons, in machining piston chaeta base and combustion chamber cover board blank step
In, the piston body blank is processed using casting or forging method, the combustion chamber cover board blank is processed using forging method.
Preferably, in the manufacturing method of above-mentioned steel pistons, in closely sealed weld seam step is processed, using argon arc welding, etc. from
The welding manner of beamlet weldering, electron beam weldering or laser beam weldering.
Preferably, in the manufacturing method of above-mentioned steel pistons, after closely sealed weld seam step is processed, following step is further included
Suddenly：
Processing and forming processes pin hole in the axis pin connecting portion, and outer circle portion and more is processed in the piston cylinder periphery
A annular groove processes combustion in the upper surface of the middle body upper surface of the bottom of combustion chamber and the combustion chamber cover board
Burn room bottom surface.
Preferably, it is further comprising the steps of after processing and forming step in the manufacturing method of above-mentioned steel pistons：It is right
Steel pistons surface carries out phosphorating treatment.
The manufacturing method of steel pistons provided by the invention can process steel pistons product as described above, the manufacturer
Method process is simple, and processing tool is easy to clamping, and Product Precision is easily guaranteed that, meanwhile, it will not to the soldering of thread fiting part
Crator is left, ensures product surface quality, extends piston service life.In addition, the steel pistons production that the manufacturing method is processed
Advantageous effect caused by product is similar with the derivation for the advantageous effect that above-mentioned steel pistons are brought, therefore repeats no more herein.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the schematic cross-sectional view of the steel pistons in the specific embodiment of the invention；
Fig. 2 is the combustion chamber lid plate structure schematic diagram in the specific embodiment of the invention；
Fig. 3 is the piston body structure schematic diagram in the specific embodiment of the invention.
Fig. 1 is into Fig. 3：
1- pin holes, 2- axis pins connecting portion, 3- piston cylinders, 4- coordinate into oil outlet, 5- cooling oil chambers, 6- annular grooves, 7- tops
Cylinder, 8- combustion chambers cover board, cooperation cylinder below 9-, 10- combustion chambers, 11- bottom of combustion chamber, the first internal threads of 31-, 32- the
One external screw thread, the second external screw threads of 81-, the second internal threads of 82-.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment belongs to the scope of protection of the invention.
Fig. 1 to Fig. 3 is refer to, Fig. 1 is the schematic cross-sectional view of the steel pistons in the specific embodiment of the invention；Fig. 2 is
Combustion chamber lid plate structure schematic diagram in the specific embodiment of the invention；Fig. 3 is the piston body structure in the specific embodiment of the invention
Schematic diagram.
In a kind of specific embodiment scheme, the present invention provides a kind of steel pistons, including piston body and combustion chamber cover board
8, piston body includes piston cylinder 3, coaxially connected bottom of combustion chamber 11 inside piston cylinder 3 and is connected to bottom of combustion chamber 11
The axis pin connecting portion 2 of lower section, the middle body of bottom of combustion chamber 11 is to 10 direction of combustion chamber protrusion and in the outer of middle body
It is provided with the first external screw thread 32 week, the upper end inner ring of piston cylinder 3 is provided with the first internal thread 31, and combustion chamber cover board 8 is tied to be annular
Structure, the upper end outer ring of combustion chamber cover board 8 are provided with the second external screw thread 81 with the cooperation of the first internal thread 31, combustion chamber cover board 8
Lower end inner ring is provided with the second internal thread 82 with the cooperation of the first external screw thread 32, combustion chamber cover board 8 and bottom of combustion chamber 11 and
Cricoid cooling oil chamber 5 is collectively formed after being threadedly coupled in piston cylinder 3, and 5 bottom of cooling oil chamber is provided with into oil outlet 4, outside first
On the outside of the auxiliary section of 32 and second internal thread 82 of the screw thread and auxiliary section of the first internal thread 31 and the second external screw thread 82 outside is
Equipped with closely sealed weld seam.
This programme provide steel pistons structure it is simple, it is easy to process, manufacture it is at low cost, the shaping of cooling oil chamber 5 is simple,
Cover board 8 stress in combustion chamber is small, and the bonding strength of inside and outside double thread connection mode is enough to ensure that combustion chamber cover board 8 in pistons work mistake
It will not come off extremely in journey, and the area that the position of closely sealed weld seam has effectively avoided chamber temperature highest and stress is concentrated the most
Domain, closely sealed weld stress is small, risk is low, can improve sealing performance and play the role of preventing from being threadedly coupled loosening, improve
Piston safety in utilization.The steel pistons of this programme disclosure satisfy that engine high power, high intensity and the requirement of low emission.
Preferably, cooperation cylinder in top is provided between the upper end outer ring of combustion chamber cover board 8 and the upper end inner ring of piston cylinder 3
7, top cooperation cylinder 7 is located at the top of the auxiliary section of the first internal thread 31 and the second external screw thread 81；The lower end of combustion chamber cover board 8
Cooperation cylinder 9 in lower section is provided between inner ring and the periphery of middle body, lower section cooperation cylinder 9 is located at the first external screw thread 32 and the
The top of the auxiliary section of two internal threads 82.When assembling the steel pistons, the threaded joints between combustion chamber cover board 8 and piston body
There is certain radial clearance, top cooperation cylinder 7 and lower section cooperation cylinder 9 can reduce threaded connection error, ensure matching somebody with somebody for the two
It closes precision and improves the positional precision of cooling oil chamber 5.
It should be noted that the closely sealed weld seam in this programme can be formed by a variety of welding manners, such as argon arc welding,
The welding manners such as beam-plasma welding, electron beam welding or LASER BEAM WELDING, the depth of weld of these welding manners is shallower, welding
Stress is small, and defect is few, at low cost, can improve the sealing performance of auxiliary section and play the role of preventing thread looseness, and
And crator will not be left in the inside of cooling oil chamber 5, improve safety in operation.
Preferably, the piston body in this programme is cast member or forge piece, and combustion chamber cover board 8 is forge piece, using tradition
Moulding process can not only reduce manufacture cost, but also may insure 3 uniform wall thickness of piston cylinder of piston body, while ensure piston
Intracoelomic cavity top, i.e. 11 uniform wall thickness of bottom of combustion chamber so as to ensure that heat dissipation is uniform, avoid hot concentration.Further, since combustion chamber
Cover board 8 is simple cyclic structure, without complicated inner-cavity structure, it is therefore not necessary to using cast shaping process, in actual production
In the process, circular steel material can also be used directly to process.
Preferably, the periphery of piston body is provided with multi-turn annular groove 6, as shown in figures 1 and 3.Multi-turn annular groove 6 is respectively used to pacify
Several compression rings and oil ring are filled, ensures the leakproofness between piston and plunger shaft.
The present invention also provides a kind of manufacturing methods of steel pistons, comprise the following steps：
S1：Machining piston chaeta base and combustion chamber cover board blank, piston body blank include piston cylinder 3, coaxially connected in work
Bottom of combustion chamber 11 inside plug tube 3 and the axis pin connecting portion 2 for being connected to 11 lower section of bottom of combustion chamber, bottom of combustion chamber 11
Middle body forms cooling oil chamber 5 to 10 direction of combustion chamber protrusion, the outer perimeter section of the centrally located part of bottom of combustion chamber 11
Bottom and processed in the bottom of cooling oil chamber 5 into oil outlet 4, combustion chamber cover board 11 is cyclic structure；
S2：Heat treatment, is respectively heat-treated piston body blank and combustion chamber cover board blank；
S3：Screw thread is processed, the first external screw thread 32 is processed in the periphery of the middle body of bottom of combustion chamber 11, in piston cylinder
3 upper end inner ring processes the first internal thread 31, and to form piston body, in combustion chamber, process can for the upper end outer ring of cover board blank
With the second external screw thread 81 of the first internal thread 31 cooperation, in combustion chamber, process can be with the first outer spiral shell for the lower end inner ring of cover board blank
The second internal thread 82 that line 32 coordinates to form combustion chamber cover board 8, ensures when combustion chamber cover board 8 is threadedly coupled with piston body it
Internal and external threads can be screwed into and screw simultaneously；
Specifically, in step s3, green body processing is carried out respectively to piston body blank and combustion chamber cover board blank, using master
Numerical control device of the axis with rotation angle control function using internal screw cutting tool and external screw cutting tool, is processed, once by pinpointing
Positioning completes internal thread and externally threaded processing in the case of clamping, and ensures piston body and combustion chamber cover board when being threadedly coupled
The internal and external threads of upper and lower ends can be screwed into and screw simultaneously.
S4：Ring is collectively formed after being threadedly coupled with bottom of combustion chamber 11 and piston cylinder 3 in built-up piston, combustion chamber cover board 8
The cooling oil chamber 5 of shape；
S5：Closely sealed weld seam is processed, spiral shell on the outside of the auxiliary section of the first external screw thread 32 and the second internal thread 82 and in first
The closely sealed sealing treatment of shallow-layer is carried out on the outside of the auxiliary section of 31 and second external screw thread 81 of line.
The manufacturing method of steel pistons provided by the invention can process steel pistons product as described above, the manufacturer
Method process is simple, and processing tool is easy to clamping, and Product Precision is easily guaranteed that, meanwhile, it will not to the soldering of thread fiting part
Crator is left, ensures product surface quality, extends piston service life.In addition, the steel pistons production that the manufacturing method is processed
Advantageous effect caused by product is similar with the derivation for the advantageous effect that above-mentioned steel pistons are brought, therefore repeats no more herein.
Preferably, in machining piston chaeta base and combustion chamber cover board blank step, processed using casting or forging method
Piston body blank processes combustion chamber cover board blank using forging method.Circular steel material can also be used and directly process combustion chamber cover board
Blank.
Preferably, in step s3, it is additionally included in above thread fiting part and processes cooperation cylinder, specifically, is firing
It burns and cooperation cylinder 7 in top is processed between the upper end outer ring of room cover plate 8 and the upper end inner ring of piston cylinder 3,7, cylinder of top cooperation
In the top of the first internal thread 31 and the auxiliary section of the second external screw thread 81；The lower end inner ring and middle body of cover board 8 in combustion chamber
Periphery between process lower section cooperation cylinder 9, lower section cooperation cylinder 9 is located at matching somebody with somebody for the first external screw thread 32 and the second internal thread 82
The top in conjunction portion.When step S4 assembles the steel pistons, the threaded joints between combustion chamber cover board 8 and piston body have a sizing
To gap, top cooperation cylinder 7 and lower section cooperation cylinder 9 can reduce threaded connection error, the fit precision both ensured with
And improve the positional precision of cooling oil chamber 5.
After together with piston body and combustion chamber cover board 8 are combined by internal and external threads connection, enter back into step S5 and process
Closely sealed weld seam, specifically, the welding sides such as argon arc welding, beam-plasma weldering, electron beam weldering or laser beam weldering can be used in step s 5
Formula is on the outside of the auxiliary section of the first external screw thread 32 and the second internal thread 82 and the first internal thread 31 and the second external screw thread 81 are matched somebody with somebody
Carry out the closely sealed sealing treatment of shallow-layer on the outside of conjunction portion, closely sealed weld seam it is deep-controlled within 2~3mm.
It should be noted that above-mentioned a variety of welding manners are welding manner ripe in the prior art, below with electronics
Beam welds specifically to introduce the process of closely sealed weld seam：
S501：Cylinder 7 and the welding position of lower section cooperation cylinder 9 is coordinated top to clean；
S502：After combustion chamber cover board 8 and piston body assembling in place, positioned；
S503：It is welded using electron-beam welder；
S5031：Steel pistons are positioned in electrothermal furnace and are preheated, heating temperature is 230 ± 15 DEG C, keeps the temperature two hours or more；
S5032：Steel pistons are positioned in electron-beam welder on special turntable, are welded, before welding machine is closed, steel
Piston face temperature is 210 ± 15 DEG C, and welding parameter is：Add beam voltage for 60KV, beam current is 50~70mA, focus current
For 2.8~4.05A, it is 65 °~85 ° to receive arc angle.
S5033：Welding booth is opened, measures steel pistons surface temperature, temperature should be in the range of 250~300 DEG C.
Preferably, it is further comprising the steps of after step S5 processes closely sealed weld seam：
S6：Processing and forming processes pin hole 1 in axis pin connecting portion 2, and outer circle portion and multiple is processed in 3 periphery of piston cylinder
Annular groove 6 processes 10 bottom of combustion chamber in the upper surface of the middle body upper surface of bottom of combustion chamber 11 and combustion chamber cover board 8
Face.
Preferably, after step S6 processing and formings, further comprising the steps of S7：Steel pistons surface is carried out at phosphatization
Reason.Phosphatization is to react steel pistons and phosphoric acid,diluted or phosphate solution, is formed on its surface the protection process of phosphate layer, can carry
Corrosion resistance, wearability and the heat resistance of high steel pistons.The phosphating process of steel pistons specifically includes following steps：
S701：Steel pistons are cleaned into oil removing, by 60~70 DEG C remove in oil solution after 5~15 minutes of steel pistons immersion, stream
Dynamic water rinsed clean；
S702：Steel pistons are immersed in phosphating solution, phosphating solution temperature is 70~75 DEG C, and phosphating time is 2~3 points
During which clock rocks steel pistons up and down as far as possible；
S703：The good steel pistons of phosphatization are immersed in flowing sink and are cleaned, workpiece surface is not allowed to have residual phosphating solution, phosphorus
Change the incomplete workpiece of film and directly return phosphatization；
S704：Steel pistons are put into 60~80 DEG C of rinsing bowls and are scalded 1~2 minute, are blown after going out slot with clean compressed air
It is dry.
The steel pistons processed according to above-mentioned manufacturing method have the following advantages：
(1) uniform wall thickness, heat dissipation is uniform, avoids hot concentration；
(2) chamber temperature highest during installing, the region that stress is concentrated the most are effectively merged out；
(3) combustion chamber cover board bears the operation inertia for firing pressure and sole mass in the course of work, and stress is small, interior
Outer double thread bonding strength is enough to ensure that combustion chamber cover board will not come off extremely during pistons work；
(4) depth of weld of closely sealed weld seam is shallow, and stress is small, and defect is few, at low cost, can improve sealing performance and
Prevent the effect of thread looseness；
(5) cooling oil chamber surface is smooth, good cooling results；
(6) clamped one time can carry out the closely sealed sealing treatment of shallow-layer to the cooperation cylinder weld seam of upper and lower ends, reduce manufacture
Cost.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications of these embodiments will be apparent for those skilled in the art, it is as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide scope caused.
Claims (10)
1. a kind of steel pistons, which is characterized in that including piston body and combustion chamber cover board (8), the piston body includes piston cylinder
(3), the coaxially connected bottom of combustion chamber (11) internal in the piston cylinder (3) and it is connected under the bottom of combustion chamber (11)
The axis pin connecting portion (2) of side, the middle body of the bottom of combustion chamber (11) is to combustion chamber direction protrusion and in the center
Partial periphery is provided with the first external screw thread (32), and the upper end inner ring of the piston cylinder (3) is provided with the first internal thread (31), institute
Combustion chamber cover board (8) is stated as cyclic structure, the upper end outer ring of the combustion chamber cover board (8) is provided with and first internal thread
(31) the second external screw thread (81) of cooperation, the lower end inner ring of the combustion chamber cover board (8) are provided with and first external screw thread
(32) the second internal thread (82) of cooperation, the combustion chamber cover board (8) and the bottom of combustion chamber (11) and the piston cylinder
(3) cricoid cooling oil chamber (5) is collectively formed after being threadedly coupled, cooling oil chamber (5) bottom is provided with into oil outlet (4),
The auxiliary section of first external screw thread (32) and second internal thread (82) outside and first internal thread (31) and institute
It states and is equipped with closely sealed weld seam on the outside of the auxiliary section of the second external screw thread (81).
2. steel pistons according to claim 1, which is characterized in that the upper end outer ring of the combustion chamber cover board (8) with it is described
Top cooperation cylinder (7) is provided between the upper end inner ring of piston cylinder (3), the top cooperation cylinder (7) is located at described first
Internal thread (31) and the top of the auxiliary section of second external screw thread (81)；The lower end inner ring of the combustion chamber cover board (8) and institute
It states and lower section cooperation cylinder (9) is provided between the periphery of middle body, the lower section cooperation cylinder (9) is located at the described first outer spiral shell
Line (32) and the top of the auxiliary section of second internal thread (82).
3. steel pistons according to claim 1, which is characterized in that the closely sealed weld seam passes through argon arc welding, beam-plasma
Welding, electron beam welding or LASER BEAM WELDING are formed.
4. steel pistons according to claim 1, which is characterized in that the piston body be cast member or forge piece, the combustion
It is forge piece to burn room cover plate (8).
5. steel pistons according to claim 1, which is characterized in that the periphery of the piston body is provided with multi-turn annular groove (6).
6. a kind of manufacturing method of steel pistons, which is characterized in that comprise the following steps：
Machining piston chaeta base and combustion chamber cover board (8) blank, the piston body blank include piston cylinder (3), it is coaxially connected in
The internal bottom of combustion chamber (11) of the piston cylinder (3) and the axis pin connecting portion being connected to below the bottom of combustion chamber (11)
(2), the middle body of the bottom of combustion chamber (11) is raised to combustion chamber direction, and being located at for the bottom of combustion chamber (11) is described
The outer perimeter section of middle body forms the bottom of cooling oil chamber (5) and is processed in the bottom of the cooling oil chamber (5) into fuel-displaced
Hole (4), the combustion chamber cover board (8) are cyclic structure；
Heat treatment, is respectively heat-treated the piston body blank and the combustion chamber cover board (8) blank；
Screw thread is processed, the first external screw thread (32) is processed in the periphery of the middle body of the bottom of combustion chamber (11), described
The upper end inner ring of piston cylinder (3) processes the first internal thread (31), to form piston body, in combustion chamber cover board (8) blank
Upper end outer ring process can with first internal thread (31) coordinate the second external screw thread (81), in the combustion chamber cover board
(8) the lower end inner ring of blank processes the second internal thread (82) that can coordinate with first external screw thread (32), to form burning
Room cover plate (8) ensures that its internal and external threads can be screwed into rotation simultaneously when the combustion chamber cover board (8) is threadedly coupled with the piston body
Tightly；
Built-up piston, after the combustion chamber cover board (8) is threadedly coupled with the bottom of combustion chamber (11) and the piston cylinder (3)
The cricoid cooling oil chamber (5) is collectively formed；
Closely sealed weld seam is processed, it is on the outside of the auxiliary section of first external screw thread (32) and second internal thread (82) and described
The closely sealed sealing treatment of shallow-layer is carried out on the outside of the auxiliary section of first internal thread (31) and second external screw thread (81).
7. the manufacturing method of steel pistons according to claim 6, which is characterized in that in machining piston chaeta base and combustion chamber
In cover board (8) blank step, the piston body blank is processed using casting or forging method, the combustion is processed using forging method
Burn room cover plate (8) blank.
8. the manufacturing method of steel pistons according to claim 6, which is characterized in that in closely sealed weld seam step is processed, adopt
With argon arc welding, the welding manner that beam-plasma welds, electron beam welds or laser beam welds.
9. the manufacturing method of steel pistons according to claim 6, which is characterized in that after closely sealed weld seam step is processed,
It is further comprising the steps of：
Processing and forming, pin hole (1) is processed in the axis pin connecting portion (2), and outer circle portion is processed in the piston cylinder (3) periphery
With multiple annular grooves (6), in the middle body upper surface of the bottom of combustion chamber (11) and the combustion chamber cover board (8)
Upper surface processes combustion chamber bottom surface.
10. the manufacturing method of steel pistons according to claim 9, which is characterized in that after processing and forming step, also wrap
Include following steps：Phosphorating treatment is carried out to steel pistons surface.
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| CN201711334094.6A CN108087141B (en) | 2017-12-08 | 2017-12-08 | Steel piston and manufacturing method thereof |
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| CN201711334094.6A CN108087141B (en) | 2017-12-08 | 2017-12-08 | Steel piston and manufacturing method thereof |
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| CN110748434A (en) * | 2019-11-29 | 2020-02-04 | 滨州渤海活塞有限公司 | Steel piston of gasoline engine and manufacturing method thereof |
| CN111550325A (en) * | 2020-05-29 | 2020-08-18 | 滨州渤海活塞有限公司 | High-strength light internal combustion engine piston |
| CN112548506A (en) * | 2020-12-11 | 2021-03-26 | 湖南江滨机器（集团）有限责任公司 | Remanufacturing method of steel piston |
| CN114856852A (en) * | 2022-05-09 | 2022-08-05 | 安徽省恒泰动力科技有限公司 | Large-cylinder-diameter air-cooled diesel engine piston |
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| Publication number | Publication date |
|---|---|
| CN108087141B (en) | 2020-03-31 |
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