CN211852010U

CN211852010U - Integral forged steel piston welded on ring land

Info

Publication number: CN211852010U
Application number: CN202020294449.4U
Authority: CN
Inventors: 张伟斌; 纪金雨; 张新华
Original assignee: Binzhou Donghailong Piston Co ltd
Current assignee: Binzhou Donghailong Piston Co ltd
Priority date: 2020-03-11
Filing date: 2020-03-11
Publication date: 2020-11-03
Anticipated expiration: 2030-03-11

Abstract

The utility model relates to a whole forged steel piston of ring bank welding, include: the piston body is a forged steel piston body, and the head of the piston body is opened corresponding to the outer side of the cooling oil cavity; the opening is welded with a ring bank part for sealing to form a cooling oil cavity, and the cooling oil cavity is communicated with the outside through an oil inlet hole and an oil outlet hole; at least part of piston ring grooves are formed in the outer wall of the ring land part; the ring bank portion comprises two or more circular ring structures, and is connected through vertical welding seam, and is fixed with welding position through horizontal welding seam. Therefore, the piston combustion chamber and the top surface have no welding line, and the safety is high. The ring bank portion is located between the skirt portion and the head portion of the piston body, so that requirements for welding strength of the ring bank portion and the piston body are not high, high-energy electron beam welding can be adopted, and requirements can be met by adopting a common welding mode among a plurality of circular ring structures. Meanwhile, the piston body and the ring land part are machined, so that the requirements on machining equipment and cutters are reduced, and the machining cost is further reduced.

Description

Integral forged steel piston welded on ring land

Technical Field

The utility model relates to an internal-combustion engine piston technical field, more specifically the whole forged steel piston of ring bank welding that says so relates to.

Background

With the improvement of emission requirements and the technical progress, trucks, engineering machinery, ship engines and generator sets are all developed towards high power and high load, and steel pistons gradually replace aluminum alloy pistons in the fields. At present, the integral forged steel piston mainly comprises two types: the other one is a welded type integral forged steel piston, and the welding type is mainly friction welding, laser welding and electron beam welding, and the welding seam in a cold oil cavity in the friction welding can not be cleaned and has the danger of falling. Both laser welding and electron beam welding have at least one welding seam on the top surface, have high requirements on welding quality and are risky to weld.

In addition a novel laser welding forged steel structure piston has still appeared among the prior art, the head becomes a whole through one vertical welding seam of top surface with the skirt section, the welding seam bottom does not hold in the palm the end, laser energy is big, the cooling oil duct top forms easily that the weld beading has the danger of droing, laser energy can appear welding imperviousness phenomenon for a short time, there is the danger of taking off the top, this kind of structure annular lower extreme is connected for the cooperation, only plays certain sealed effect, to the supporting role that does not have of annular, the piston is at work, the annular is out of shape greatly, the piston ring blocks fast easily.

Therefore, how to provide a ring-land welded integrally forged piston, which overcomes the above-mentioned shortcomings of integrally forged steel pistons, is a problem that needs to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model aims to provide a whole forged steel piston of ring bank welding, rational in infrastructure, safer, the welding is easy, has overcome the not enough that exists among the prior art.

The utility model provides a whole forged steel piston of ring bank welding, include:

the piston body is a forged steel piston body, and the head of the piston body, which corresponds to the outer side of the cooling oil cavity, is open;

the opening is welded with the ring bank part for sealing to form a cooling oil cavity, and the cooling oil cavity is communicated with the outside through an oil inlet hole and an oil outlet hole; at least part of piston ring grooves are formed in the outer wall of the ring land part;

the ring bank part is composed of two or more circular rings and is connected through a vertical welding line, and the top and the bottom of the ring bank part are respectively welded and fixed with the opening through horizontal welding lines.

According to the technical scheme, compared with the prior art, the utility model discloses a ring bank welding integral forged steel piston, the ring bank portion comprises two or more circular ring structures which are connected through a vertical welding seam, the top and the bottom of the ring bank portion and the upper and the lower parts of an opening at the position of the cooling oil cavity corresponding to the piston body are welded through a horizontal welding seam, and the ring bank portion and the piston body are welded into a whole; therefore, the piston combustion chamber and the top surface have no welding line, and the safety is high. The ring bank portion is located between the skirt portion and the head portion of the piston body, so that requirements for welding strength of the ring bank portion and the piston body are not high, high-energy electron beam welding can be adopted, and requirements can be met by adopting a common welding mode among a plurality of circular ring structures. Meanwhile, the piston body and the ring land part are machined, so that the requirements on machining equipment and cutters are reduced, and the machining cost is further reduced.

Furthermore, the upper part and the lower part of the opening are both reserved with first positioning parts, and the ring bank part is reserved with second positioning parts which are embedded with the first positioning parts corresponding to the upper part and the lower part of the opening, so that the ring bank part is convenient to mount, and meanwhile, the assembly precision is ensured and the assembly consistency is improved.

Furthermore, the first positioning part is an annular boss, and the second positioning part is an annular groove matched with the annular boss; thereby making assembly easier.

Furthermore, the connecting parts of the adjacent circular ring structures are provided with the step steps which are mutually embedded, so that the welding is convenient, the welding mode can adopt common argon arc welding, and the requirement on the welding is reduced.

Furthermore, the height difference between the terraces of the ladder steps is 0.5-1.5mm, the welding is convenient,

furthermore, the height difference between the step platforms of the step steps is 1.0mm, which is more beneficial to welding.

The step is mainly required by welding, if the height difference is smaller than 0.5mm, the welding leakage phenomenon can occur during welding, and the connecting strength is affected because the welding is easy to be impervious when the height difference is larger than 1.5 mm. Through experimental research, the unexpected discovery is that when the difference in height is in 1.0mm, welding not only satisfies the requirement, and joint strength strengthens simultaneously.

Further, the first ring groove is arranged on the piston body, and the rest of the ring grooves are arranged on the ring land part, so that the safety of the piston operation is improved.

The utility model provides a processing method of a ring bank welding integral forged steel piston, which comprises the steps of respectively forging a piston body and an integral ring bank part; then the piston body and the whole ring land are respectively processed to a semi-finished product state according to the rough processing requirement; dividing the whole ring bank part into two or more parts of ring structures according to the structure; then assembling the annular structure on the piston body separately, welding two or more parts of the annular structure into a whole through a vertical welding line, welding the ring land part and the piston body into a whole through a horizontal welding line, and forming a cooling oil cavity; and finally, carrying out heat treatment, finish machining and surface treatment to obtain a finished product.

According to the technical scheme, compare with prior art, the utility model discloses a processing method of whole forged steel piston of ring bank welding has reduced the requirement to processing equipment, cutter because piston body and ring bank part open the processing, and then has reduced the processing cost. The piston combustion chamber and the top surface have no welding line, and the safety is high. The ring bank portion is located between the skirt portion and the head portion of the piston body, so that requirements for welding strength of the ring bank portion and the piston body are not high, high-energy electron beam welding can be adopted, and requirements can be met by adopting a common welding mode among a plurality of circular ring structures.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be 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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a ring-land welded integral forged steel piston according to the present invention;

fig. 2 is a sectional view of a piston body of a ring-land welded integral forged steel piston provided by the present invention;

FIG. 3 the drawings show a vertical weld F showing the land portion;

FIG. 4 is a cross-sectional view of a land portion of a land welded monobloc forged steel piston according to the present invention;

FIG. 5 is a top view of a land portion of a land welded monobloc forged steel piston according to the present invention;

FIG. 6 is an enlarged partial view of the FIG. 5 drawing;

FIG. 7 is a top view of the drawing of FIG. 1 (showing the location of the oil inlet and outlet ports);

in the figure: 100-a piston body, 101-a first positioning part, 200-a land part, 201-a second positioning part, 202-a step, 300-a cooling oil cavity, 400-a piston ring groove and F-a vertical welding line.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1-3 and 7, in one embodiment of the present invention, there is provided a ring-land welded monobloc forged steel piston comprising:

the piston body 100 is a forged steel piston body, and the head of the piston body 100, which corresponds to the outside of the cooling oil cavity 300, is open;

the opening is welded with the ring land part 200 to be closed to form a cooling oil cavity 300, and the cooling oil cavity 300 is communicated with the outside through an oil inlet hole 301 and an oil outlet hole 302; at least part of the piston ring groove 400 is arranged on the outer wall of the ring land part 200;

the ring bank portion 200 is formed by two or more circular rings and is connected by vertical welding seams, and the top and the bottom of the ring bank portion are respectively welded and fixed with the opening by horizontal welding seams.

The utility model discloses a ring bank welding integral forged steel piston, the ring bank comprises two or more circular ring structures which are connected by vertical welding seams, the top and bottom of the ring bank and the upper and lower open parts of the piston body corresponding to the position of a cooling oil cavity are welded by horizontal welding seams, thus the ring bank and the piston body are welded into a whole; therefore, the piston combustion chamber and the top surface have no welding line, and the safety is high. The ring bank portion is located between the skirt portion and the head portion of the piston body, so that requirements for welding strength of the ring bank portion and the piston body are not high, high-energy electron beam welding can be adopted, and requirements can be met by adopting a common welding mode among a plurality of circular ring structures. Meanwhile, the piston body and the ring land part are machined, so that the requirements on machining equipment and cutters are reduced, and the machining cost is further reduced.

Advantageously, referring to fig. 2 and 4, the upper and lower portions of the opening are reserved with first positioning portions 101, and the land portion 200 is reserved with second positioning portions 201 corresponding to the upper and lower portions of the opening and engaged with the first positioning portions 101. Therefore, the installation of the ring bank part is convenient, and meanwhile, the assembly precision is ensured and the assembly consistency is improved.

Specifically, the first positioning portion 101 is an annular boss, and the second positioning portion 201 is an annular groove adapted to the annular boss. Thereby making assembly easier. Of course, the first positioning portion 101 may be an annular groove, and the second positioning portion 201 may be an annular boss adapted to the annular groove.

Referring to fig. 5-7, the connecting portions of the adjacent circular ring structures are provided with the mutually embedded step steps 202, so that the welding is convenient, the welding mode can adopt common argon arc welding, and the requirement on welding is reduced.

Advantageously, the height difference between the step platforms of the step steps 202 is 0.5-1.5mm, which facilitates welding.

More advantageously, the step 202 has a height difference of 1.0mm between the steps, which is more advantageous for welding.

In the embodiment of the present invention, it is preferable that the first ring groove 400 is disposed on the piston body 100 and the rest of the ring grooves are disposed on the land portion, thereby improving the safety of the piston operation.

The utility model provides a welding method for welding an integral forged steel piston on a ring bank, which comprises the steps of respectively forging a piston body and an integral ring bank part; then the piston body and the whole ring land are respectively processed to a semi-finished product state according to the rough processing requirement; dividing the whole ring bank part into two or more parts of ring structures according to the structure; then assembling the annular structure on the piston body separately, welding the two or more parts of the annular structure into a whole through a vertical welding line, and forming a cooling oil cavity; and finally, carrying out heat treatment, finish machining and surface treatment to obtain a finished product.

After the first positioning part is machined on the piston body, the ring structure divided into parts is assembled on the piston body, the ring land part is welded into a whole through a vertical welding seam F, the ring land part and the piston body are welded into a whole through a horizontal welding seam, and a closed oil cavity is formed.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. The utility model provides a whole forged steel piston of land welding which characterized in that includes:

the piston body (100) is a forged steel piston body, and the outer side of the head part of the piston body (100), which corresponds to the cooling oil cavity (300), is open;

the opening is welded with the ring land portion (200) in a closed mode to form a cooling oil cavity (300), and the cooling oil cavity (300) is communicated with the outside through an oil inlet hole (301) and an oil outlet hole (302); at least part of a piston ring groove (400) is formed in the outer wall of the ring land part (200);

the ring bank part (200) is composed of two or more circular ring structures and is connected through a vertical welding line, and the top and the bottom of the ring bank part (200) are respectively welded and fixed with the opening through a horizontal welding line.

2. The land-welding integral forged steel piston as claimed in claim 1, wherein a first positioning portion (101) is reserved on each of the upper and lower portions of the opening, and a second positioning portion (201) which is embedded with the first positioning portion (101) is reserved on the land portion (200) corresponding to the upper and lower portions of the opening.

3. The land weld integral forged steel piston of claim 2, wherein said first locating portion (101) is an annular boss and said second locating portion (201) is an annular groove adapted to said annular boss.

4. A land welded integrally forged steel piston as claimed in claim 1, wherein adjacent said ring structure joints have interfitting stepped steps (202).

5. The land-land welded integrally forged steel piston as claimed in claim 4, wherein the step difference between the step lands of said step lands (202) is 0.5-1.5 mm.

6. A land-land welded integrally forged steel piston as claimed in claim 5, wherein the step difference between the step lands of said step lands (202) is 1.0 mm.

7. A land welded integrally forged steel piston according to any of claims 1-6, wherein a first said ring groove (400) is disposed on said piston body (100).