CN114439642A - Piston and manufacturing method thereof - Google Patents
Piston and manufacturing method thereof Download PDFInfo
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- CN114439642A CN114439642A CN202210108588.7A CN202210108588A CN114439642A CN 114439642 A CN114439642 A CN 114439642A CN 202210108588 A CN202210108588 A CN 202210108588A CN 114439642 A CN114439642 A CN 114439642A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- 238000003466 welding Methods 0.000 claims abstract description 143
- 238000005242 forging Methods 0.000 claims abstract description 48
- 241001016380 Reseda luteola Species 0.000 claims description 51
- 238000001816 cooling Methods 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 18
- 238000010894 electron beam technology Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 3
- 238000004381 surface treatment Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 46
- 230000000694 effects Effects 0.000 description 11
- 238000003754 machining Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000010705 motor oil Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000013585 weight reducing agent Substances 0.000 description 4
- 229910000851 Alloy steel Inorganic materials 0.000 description 3
- 238000012938 design process Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
- F02F3/0015—Multi-part pistons
- F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
-
- 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
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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
- F02F3/0015—Multi-part pistons
- F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
- F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Fluid Mechanics (AREA)
- Plasma & Fusion (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses a piston which comprises a piston outer top, a piston inner top and a piston skirt, wherein the outer part of the piston skirt is connected with the lower part of the piston outer top through a ring-land welding line, the inner part of the piston skirt is connected with the lower part of the piston inner top through an inner cavity welding line, and the upper part of the piston inner top is connected with the upper part of the piston outer top through a top surface welding line. The piston reduces the manufacturing difficulty and cost, improves the lightweight index of the piston and improves the power-weight ratio of an engine. The invention also discloses a manufacturing method applied to the piston, which comprises the following steps: separately forging the piston outer top, the piston inner top and the piston skirt; the piston outer top, the piston inner top and the piston skirt are machined in a split mode; the piston outer top, the piston inner top and the piston skirt are welded at the inner cavity welding line, the top surface welding line and the ring bank welding line, and the manufacturing method has the same beneficial effect.
Description
Technical Field
The invention relates to the technical field of pistons, in particular to a piston. In addition, the invention also relates to a manufacturing method applied to the piston.
Background
With the continuous development of emission upgrading, the thermal efficiency and the power-weight ratio of the engine are continuously improved, and a heat-resistant alloy steel piston is one of the inevitable choices. Firstly, the alloy steel has better heat resistance and high-temperature strength, and can safely operate at higher gas temperature and higher explosion pressure; and secondly, the alloy steel has high structural rigidity, and the height and the weight of the piston can be reduced through structural optimization, so that the weight of the engine is reduced, and the power-weight ratio of the engine is improved. The piston is used as a core part of the engine, and the enhancement of the reliability of the piston is the fundamental guarantee of the thermal efficiency and the power improvement of the engine; the light weight development of the engine can effectively improve the upper limit of the rotating speed of the engine, reduce the weight of the engine and the like; the high thermal efficiency can effectively reduce the fuel consumption and the discharge amount of tail gas particles, and is a main measure for realizing the discharge upgrade; and simultaneously, the manufacturing cost of the piston and the manufacturing cost of the engine are reduced.
At present, a piston generally adopts a top skirt split welding forging structure, the top skirt split welding forging structure is shown as a figure 1, and a forging blank is shown as a figure 2. The defects are as follows: in the single cooling oil cavity structure, the cooling effect of the inner cavity and the inner ends of the pin holes is insufficient, and the high-temperature phenomenon is easy to occur, so that the pin holes are abraded or occluded due to high-temperature coking of engine oil; the forging difficulty is high, the cost is high, the physical space of a piston skirt forging blank is large, and particularly a large-cylinder-diameter piston needs correspondingly large forging stroke and forging pressure, so that the forging energy consumption and the die loss are aggravated, and the blank filling effect is poor due to too deep forging depth (the piston inner cavity in fig. 2 is deep in forging depth); the weight reduction space is small, and particularly the difficulty in removing materials above the pin boss of the inner cavity is high.
In summary, how to effectively solve the problems of large forging difficulty, high cost, large physical space of piston skirt forging blank, poor blank mold filling effect easily caused by too deep forging depth and the like is a problem which needs to be solved by technical personnel in the field at present.
Disclosure of Invention
The invention aims to provide a piston, which reduces the manufacturing difficulty and cost, improves the lightweight index of the piston and improves the power-weight ratio of an engine; another object of the present invention is to provide a manufacturing method applied to the above piston, which has the same advantageous effects as the manufacturing method.
In order to solve the technical problems, the invention provides the following technical scheme:
the piston comprises an outer piston top, an inner piston top and a piston skirt, wherein the outer portion of the piston skirt is connected with the lower portion of the outer piston top through a ring-land welding seam, the inner portion of the piston skirt is connected with the lower portion of the inner piston top through an inner cavity welding seam, and the upper portion of the inner piston top is connected with the upper portion of the outer piston top through a top surface welding seam.
Optionally, in the welding combination process, an outer cooling oil cavity is formed inside the outer top of the piston, below the inner top of the piston and in the upper area of the piston skirt, an inner cooling oil cavity is formed between the lower side of the inner top of the piston and the upper area of the piston skirt, and the outer cooling oil cavity and the inner cooling oil cavity are communicated through a plurality of oil holes.
Optionally, 4 to 8 oil holes are uniformly distributed in the outer cooling oil cavity and the inner cooling oil cavity in the circumferential direction.
Optionally, the weld depths of the inner cavity weld, the top surface weld, and the land-ring weld in the circumferential direction are equidistant.
Optionally, the inner cavity weld seam, the top surface weld seam, and the land girth weld seam are formed by laser welding or electron beam welding.
The present invention also provides a manufacturing method applied to any one of the above pistons, including the steps of:
separately forging the piston outer top, the piston inner top and the piston skirt;
the piston outer top, the piston inner top and the piston skirt are machined in a split mode;
and welding the piston outer top, the piston inner top and the piston skirt at the inner cavity welding line, the top surface welding line and the ring bank welding line.
Optionally, welding the piston outer crown, the piston inner crown, and the piston skirt at the inner cavity weld joint, the top surface weld joint, and the ring land weld joint, includes:
welding the inner top of the piston and the piston skirt at the welding seam of the inner cavity to form a first welding body;
and respectively welding the top surface welding seam and the ring bank welding seam, and welding the outer top of the piston on the first welding body to form a second welding body.
Optionally, the welding at the top surface weld seam and the ring land weld seam respectively includes: and simultaneously welding the top surface welding seam and the ring bank welding seam.
Optionally, after welding the piston outer crown to the first welded body to form a second welded body by welding the piston outer crown to the first welded body separately at the top surface weld seam and the land ring weld seam, the method further includes: and carrying out mechanical processing and surface treatment on the second welding body.
The piston provided by the invention comprises a piston outer top, a piston inner top and a piston skirt, wherein the piston outer top is positioned on the outer side of the piston inner top, and the upper part of the piston inner top is connected with the upper part of the piston outer top through a top surface welding line;
the piston outer top and the piston inner top are positioned on the piston skirt, the outer part of the piston skirt is connected with the lower part of the piston outer top through a ring bank welding line, and the inner part of the piston skirt is connected with the lower part of the piston inner top through an inner cavity welding line.
The piston is formed by welding and combining the outer piston top, the inner piston top and the piston skirt, and the outer piston top, the inner piston top and the piston skirt are formed by separately forging. The forging blank of the piston outer top, the piston inner top and the piston skirt is far lower than the total height of the piston. In the design process of the forging blank, the heights of the piston outer top, the piston inner top and the piston skirt can be properly adjusted according to the existing capacity of the forging machine, so that the forging feasibility and the mold filling effect are improved; the method can effectively reduce the physical space of the forging blank, avoid the manufacturing defect of large-scale complex structure forging forming, and is an effective method for solving the problems of difficult forging forming, high cost and poor quality of the piston, particularly the large-cylinder-diameter piston blank.
By applying the technical scheme provided by the embodiment of the invention, the material can be removed to a greater extent, the piston weight reduction space is large, and the piston lightweight index is improved, so that the power-weight ratio of the engine is improved; the manufacturing difficulty and cost are reduced, the feasibility of piston forging forming is high, the cost is reduced, and the product quality is improved.
The present invention also provides a method of manufacturing a piston applied to any one of the above, including the steps of: separately forging the outer piston top, the inner piston top and the piston skirt; the outer top of the piston, the inner top of the piston and the piston skirt are machined in a split manner; and welding the outer piston top, the inner piston top and the piston skirt at the welding seam of the inner cavity, the welding seam of the top surface and the welding seam of the ring bank. The manufacturing method is applied to any one of the above-described piston manufacturing methods. Since the piston has the technical effects, the manufacturing method applied to any one of the pistons should have corresponding technical effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a typical split welded forged piston with a top skirt according to the prior art;
FIG. 2 is a schematic illustration of a typical top skirt split weld forging piston forging blank of the prior art;
FIG. 3 is a schematic diagram of a piston according to one embodiment of the present invention;
FIG. 4 is a view of the split weld of the piston;
FIG. 5 is a schematic view of a piston forging blank;
FIG. 6 is a schematic view of piston split machining;
FIG. 7 is a schematic cross-sectional view of three welds;
fig. 8 is a flowchart of a method for manufacturing a piston according to an embodiment of the present disclosure.
The drawings are numbered as follows:
the piston comprises a piston outer top 1, a piston inner top 2, a piston skirt 3, an outer cooling oil cavity 4, an inner cooling oil cavity 5, an oil hole 6, an inner cavity welding line I, a top surface welding line II and a ring bank welding line III.
Detailed Description
The core of the invention is to provide a piston, which reduces the manufacturing difficulty and cost, improves the lightweight index of the piston and improves the power-weight ratio of an engine; another core of the present invention is to provide a manufacturing method applied to the above piston, which has the same beneficial effects as the manufacturing method.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 3 to 7, fig. 3 is a schematic structural diagram of a piston according to an embodiment of the present invention; FIG. 4 is a view of the split weld of the piston; FIG. 5 is a schematic view of a piston forging blank;
FIG. 6 is a schematic view of piston split machining; FIG. 7 is a schematic cross-sectional view of three welds.
In a specific embodiment, the piston provided by the invention comprises a piston outer top 1, a piston inner top 2 and a piston skirt 3, wherein the outer part of the piston skirt 3 is connected with the lower part of the piston outer top 1 through a ring-land weld joint III, the inner part of the piston skirt 3 is connected with the lower part of the piston inner top 2 through an inner cavity weld joint I, and the upper part of the piston inner top 2 is connected with the upper part of the piston outer top 1 through a top surface weld joint II;
in the welding combination process, an outer cooling oil cavity 4 is formed on the inner side of the piston outer top 1, the lower surface of the piston inner top 2 and the upper surface area of the piston skirt 3, an inner cooling oil cavity 5 is formed on the lower surface of the piston inner top 2 and the upper surface area of the piston skirt 3, and the outer cooling oil cavity 4 is communicated with the inner cooling oil cavity 5 through a plurality of oil holes 6.
In the structure, the piston comprises a piston outer top 1, a piston inner top 2 and a piston skirt 3, the piston outer top 1 is positioned on the outer side of the piston inner top 2, and the upper part of the piston inner top 2 is connected with the upper part of the piston outer top 1 through a top surface welding seam II;
the piston outer top 1 and the piston inner top 2 are located on the piston skirt 3, the outer portion of the piston skirt 3 is connected with the lower portion of the piston outer top 1 through a ring-land welding seam III, and the inner portion of the piston skirt 3 is connected with the lower portion of the piston inner top 2 through an inner cavity welding seam I.
The piston is formed by welding and combining the piston outer top 1, the piston inner top 2 and the piston skirt 3, and the piston outer top 1, the piston inner top 2 and the piston skirt 3 are formed by separately forging as shown in figure 5. The forging blanks of the piston outer top 1, the piston inner top 2 and the piston skirt 3 are far lower than the total height of the piston. In the design process of the forging blank, the heights of the piston outer top 1, the piston inner top 2 and the piston skirt 3 can be properly adjusted according to the existing capacity of a forging machine, so that the forging feasibility and the mold filling effect are improved; the method can effectively reduce the physical space of the forging blank, avoid the manufacturing defect of large-scale complex structure forging forming, and is an effective method for solving the problems of difficult forging forming, high cost and poor quality of the piston, particularly the large-cylinder-diameter piston blank.
By applying the technical scheme provided by the embodiment of the invention, the material can be removed to a greater extent, the piston weight reduction space is large, and the piston lightweight index is improved, so that the power-weight ratio of the engine is improved; the manufacturing difficulty and cost are reduced, the feasibility of piston forging forming is high, the cost is reduced, and the product quality is improved.
On the basis of the specific embodiment, in the welding combination process, an outer cooling oil cavity 4 is formed in the inner side of the outer piston top 1, the lower side of the inner piston top 2 and the upper area of the piston skirt 3, an inner cooling oil cavity 5 is formed in the lower side of the inner piston top 2 and the upper area of the piston skirt 3, the outer cooling oil cavity 4 is communicated with the inner cooling oil cavity 5 through a plurality of oil holes 6, the oil holes 6 are used for ensuring that engine oil of the inner oil cavity and the oil hole of the outer oil cavity circulate to form an oil path, and the double-cooling oil cavity structure can improve the cooling capacity of the head of the piston and enhance the reliability of the service structure of the piston.
The piston is provided with the inner cooling oil cavity and the outer cooling oil cavity, the outer cooling oil cavity 4 can effectively reduce the service temperature of the ring groove region, the inner cooling oil cavity 5 can effectively reduce the service temperature of the inner cavity and the pin boss root region, the integral cooling effect of the head of the piston is comprehensively improved inside and outside, and the reliability of the service structure of the piston is enhanced.
On the basis of the specific embodiments, 4-8 oil holes 6 are circumferentially arranged on the outer cooling oil cavity 4 and the inner cooling oil cavity 5, the oil holes 6 are uniformly arranged, and the outer cooling oil cavity 4 and the inner cooling oil cavity 5 can be uniformly communicated in the circumferential direction, so that oil paths formed by the outer cooling oil cavity 4 and the inner cooling oil cavity 5 are uniformly distributed, the engine oil is uniformly circulated, the whole piston head is uniformly cooled, and the local temperature is prevented from being higher.
On the basis of each above-mentioned specific embodiment, the welding seam degree of depth equidistance of inner chamber welding seam I, top surface welding seam II and ring bank welding seam III on the circumferential direction refers to fig. 7, for the welding cross-section schematic diagram of three welding seams, and the welding seam degree of depth design is circumferential equidistance, ensures that effective welding is dark even, is convenient for weld forming, guarantees welding quality.
On the basis of the above-mentioned each embodiment, the inner chamber weld joint i, the top surface weld joint ii and the ring bank weld joint iii can be formed by laser welding, and can also be formed by electron beam welding.
The laser welding is not influenced by a magnetic field and can accurately align weldments; the laser beam can be focused on a very small area, and small and closely spaced parts can be welded; the high-speed welding can be easily carried out automatically, and the welding can also be controlled by a digital or computer; can reduce the heat input quantity to the minimum required quantity, has small metallurgical change range of a heat affected zone, and has the advantages of minimum deformation caused by heat conduction and the like.
Electron beam welding has high energy density; the method is carried out in vacuum, and the chemical components of the welding seam are stable and pure; the joint has high strength and high welding seam quality; no need of welding rod, uneasy oxidation, good process repeatability, small thermal deformation and the like.
Corresponding to the above piston embodiment, the present application also provides a manufacturing method applied to any one of the above pistons, and the piston manufacturing method described below and the above piston can be referred to correspondingly.
Referring to fig. 8, a flow chart of a method for manufacturing a piston according to an embodiment of the present disclosure is provided, where the method may include the following steps:
s110: the piston outer top 1, the piston inner top 2 and the piston skirt 3 are forged in a split mode.
In practical application, the piston outer top 1, the piston inner top 2 and the piston skirt 3 are formed by separate forging as shown in fig. 5. It can be seen that the forging blanks of the piston outer top 1, the piston inner top 2 and the piston skirt 3 are far lower than the total height of the piston. In the design process of the forging blank, the heights of the piston outer top 1, the piston inner top 2 and the piston skirt 3 can be properly adjusted according to the existing capacity of a forging machine, so that the forging feasibility, the mold filling effect and the like are improved; the method can effectively reduce the physical space of the forging blank, avoid the manufacturing defect of large-scale complex structure forging forming, and is an effective method for solving the problems of difficult forging forming, high cost and poor quality of the piston, particularly the large-cylinder-diameter piston blank.
S120: and (3) machining the piston outer top 1, the piston inner top 2 and the piston skirt 3 in a split manner.
In practical application, the piston outer top 1, the piston inner top 2 and the piston skirt 3 are subjected to split machining before being welded as shown in fig. 6, so that the machining precision of each component can be improved, particularly the surface quality, the shape, the position degree and the like of a cooling oil cavity can be improved, and the good surface quality of the cooling oil cavity can effectively improve the engine oil vibration cooling effect during piston operation; the shape and position processing precision of the cooling oil cavity can improve the plasticity of the cooling oil channel and the upper limit of thin-wall design, so that the lightweight index is improved, and the like.
S130: and welding the piston outer top 1, the piston inner top 2 and the piston skirt 3 at an inner cavity welding line I, a top surface welding line II and a ring bank welding line III.
In practical application, the piston outer top 1, the piston inner top 2 and the piston skirt 3 can adopt laser welding, electron beam welding and the like at the inner cavity welding line I, the top surface welding line II and the ring bank welding line III, and the welding forming operation is simple and the connection strength is high. Optionally, the depth of the welding seam is equal in the circumferential direction, and the welding section of three welding seams is shown in fig. 7, so that the effective welding depth is ensured to be uniform, the welding forming is facilitated, and the welding quality is ensured.
By applying the technical scheme provided by the embodiment of the invention, the double-cooling oil cavity structure can improve the cooling capacity of the piston head and enhance the reliability of the service structure of the piston; the material can be removed to a greater extent, the piston weight reduction space is large, and the piston lightweight index is improved, so that the power-weight ratio of the engine is improved; the manufacturing difficulty and cost are reduced, the feasibility of piston forging forming is high, the cost is reduced, and the product quality is improved.
In one embodiment of the present application, welding the piston outer crown 1, the piston inner crown 2, and the piston skirt 3 at the cavity weld i, the top weld ii, and the land weld iii may include the steps of:
welding at the welding seam I of the inner cavity, and welding the piston inner top 2 and the piston skirt 3 into a first welding body;
and respectively welding the top surface welding seam II and the ring bank welding seam III, and welding the piston outer top 1 on the first welding body to form a second welding body.
For convenience of description, the above two steps will be combined.
In practical application, the welding sequence is as follows: the piston outer top 1 and the piston inner top 2 are welded into a whole by welding the inner cavity welding seam I, then the piston outer top 1 is welded into a whole by welding the top surface welding seam II and the ring bank welding seam III, and the welding sequence of the inner cavity welding seam I and the outer cavity welding seam I is adopted, so that the welding is convenient and the operation is easy.
In one embodiment of the present application, the welding at the top surface weld ii and the circumferential weld iii respectively may include the following steps:
and simultaneously welding the top surface welding seam II and the ring bank welding seam III.
In practical application, the welding of the top surface welding seam II and the ring bank welding seam III can be carried out simultaneously, so that the time is saved, and the working efficiency is improved.
Of course, the welding of the top surface weld joint II and the ring-land weld joint III can also be performed separately, for example, the top surface weld joint II is welded first, and then the ring-land weld joint III is welded.
In an embodiment of the present application, after welding the piston crown 1 to the first welded body to form the second welded body by welding the top surface weld joint ii and the ring land weld joint iii, the following steps may be further included:
the second welded body is subjected to machining and surface treatment.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The piston and the method for manufacturing the same according to the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The utility model provides a piston, its characterized in that, top (2) and piston skirt (3) in top (1), the piston outside including the piston, the outside of piston skirt (3) with the lower part of top (1) is passed through the ring bank welding seam (III) and is connected outside the piston, the inside of piston skirt (3) with the lower part of top (2) is passed through inner chamber welding seam (I) and is connected in the piston, the upper portion of top (2) with the upper portion of top (1) is passed through top surface welding seam (II) and is connected outside the piston.
2. The piston as claimed in claim 1, characterized in that, during the welding assembly, the inner side of the piston crown (1), the lower side of the piston inner crown (2) and the upper region of the piston skirt (3) form an outer cooling oil chamber (4), the lower side of the piston inner crown (2) and the upper region of the piston skirt (3) form an inner cooling oil chamber (5), and the outer cooling oil chamber (4) and the inner cooling oil chamber (5) communicate with each other through a plurality of oil holes (6).
3. The piston according to claim 2, characterized in that the outer cooling oil chamber (4) and the inner cooling oil chamber (5) are circumferentially evenly distributed with 4-8 oil holes (6).
4. A piston according to any of claims 1-3, characterized in that the weld depths in the circumferential direction of the bore weld (i), the top weld (ii) and the ring land weld (iii) are equidistant.
5. The piston according to claim 4, characterized in that the bore weld (I), the top weld (II) and the ring-land weld (III) are formed by laser welding or electron beam welding.
6. A manufacturing method applied to the piston of any one of claims 1 to 5, characterized by comprising the steps of:
separately forging the piston outer top (1), the piston inner top (2) and the piston skirt (3);
the piston outer top (1), the piston inner top (2) and the piston skirt (3) are machined in a split mode;
and welding the piston outer top (1), the piston inner top (2) and the piston skirt (3) at the inner cavity welding line (I), the top surface welding line (II) and the ring land welding line (III).
7. The method of manufacturing according to claim 6, wherein welding the piston outer crown (1), the piston inner crown (2), the piston skirt (3) at the bore weld (I), the crown weld (II), and the ring land weld (III) comprises:
welding the inner cavity welding seam (I), and welding the piston inner top (2) and the piston skirt (3) into a first welding body;
and respectively welding the top surface welding seam (II) and the ring bank welding seam (III), and welding the piston outer top (1) on the first welding body to form a second welding body.
8. The manufacturing method according to claim 7, wherein the welding at the top surface weld (II) and the land-surrounding weld (III), respectively, comprises: and simultaneously welding the top surface welding seam (II) and the ring bank welding seam (III).
9. The manufacturing method according to claim 6, wherein the top surface weld (II) and the land ring weld (III) are welded separately, and after the piston crown (1) is welded to the first welded body to form a second welded body, the method further comprises: and carrying out mechanical processing and surface treatment on the second welding body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| US20100108000A1 (en) * | 2008-11-05 | 2010-05-06 | Rainer Scharp | Multi-part piston for an internal combustion engine and method for its production |
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| WO2015172880A1 (en) * | 2014-05-16 | 2015-11-19 | Mahle International Gmbh | Method for producing a piston for an internal combustion engine and piston produced by means of said method |
| CN108331677A (en) * | 2018-04-03 | 2018-07-27 | 滨州东海龙活塞有限公司 | A kind of welded type entirety forging steel piston and its manufacturing process |
| CN109931178A (en) * | 2017-12-19 | 2019-06-25 | 强莉莉 | A kind of piston and its forming method |
| CN111173638A (en) * | 2020-01-17 | 2020-05-19 | 滨州东海龙活塞有限公司 | Penetration welding type forged steel piston and machining method thereof |
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| CN101092914A (en) * | 2007-07-20 | 2007-12-26 | 山东滨州渤海活塞股份有限公司 | Welding type single piece piston in forged steel with close internal cooling oil pocket and fabricating method |
| US20100108000A1 (en) * | 2008-11-05 | 2010-05-06 | Rainer Scharp | Multi-part piston for an internal combustion engine and method for its production |
| CN103016194A (en) * | 2012-11-30 | 2013-04-03 | 山东滨州渤海活塞股份有限公司 | Double-cooling oil chamber welded type integrally-steel-forged internal combustion engine piston and fabricating method thereof |
| WO2015172880A1 (en) * | 2014-05-16 | 2015-11-19 | Mahle International Gmbh | Method for producing a piston for an internal combustion engine and piston produced by means of said method |
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Application publication date: 20220506 |