CN215860527U

CN215860527U - Piston capable of eliminating casting defects of piston pin hole

Info

Publication number: CN215860527U
Application number: CN202121609492.6U
Authority: CN
Inventors: 何强; 彭春华
Original assignee: Jiangsu Yonghang Rail Transit Technology Co ltd
Current assignee: Jiangsu Yonghang Rail Transit Technology Co ltd
Priority date: 2021-07-15
Filing date: 2021-07-15
Publication date: 2022-02-18
Anticipated expiration: 2031-07-15

Abstract

The utility model provides a piston capable of eliminating casting defects of a piston pin hole, which comprises a piston tail and a piston top which are integrally connected, wherein an oil guide inner cavity is formed in the piston top; slag phases generated by molten iron turbulence at important parts below the piston pin hole can be fully gathered and stored, and no casting defects at the pin seat and the pin hole are ensured.

Description

Piston capable of eliminating casting defects of piston pin hole

Technical Field

The utility model discloses a piston capable of eliminating casting defects of a piston pin hole, and relates to the field of cylinder piston casting.

Background

The piston is used as a heart part of a diesel engine, has high requirements on the internal quality of a pin seat and a pin hole, and does not allow any casting defects such as slag holes, shrinkage porosity, air holes and the like. However, in view of the whole piston structure, the pin seat and the pin hole are the parts with the largest wall thickness and the most complex structure, the parts are often the parts which are most prone to casting defects, and the defects with the largest probability are shrinkage porosity, slag inclusion and air holes in sequence; there is an urgent need for a piston that eliminates the casting defects of the piston pin bore to solve the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide a piston for eliminating the casting defect of a piston pin hole so as to solve the problems in the background art, and the piston is reasonable in structure and can eliminate the shrinkage defect of the part below the piston pin hole; slag phases generated by molten iron turbulence at important parts below the piston pin hole can be fully gathered and stored, and no casting defects at the pin seat and the pin hole are ensured.

In order to achieve the purpose, the utility model is realized by the following technical scheme: the utility model provides a can eliminate piston pinhole casting defect's piston, the device includes piston tail and the piston top of an organic whole connection, the piston top is inside to be seted up and to lead the oil inner chamber, transversely there is the piston pinhole between piston top and the piston tail, piston pin downthehole wall is provided with the rising head, it is provided with first chill near the rising head to lead the oil inner chamber, the piston top is inside to be seted up annular oil groove, annular oil groove inboard is provided with the second chill.

Further, first chill, second chill are the loop configuration, first chill, second chill distribute inside the piston crown along same vertical line.

Further, the riser is equipped with two, and two risers are symmetrical about the piston central line, the riser is the riser of type that generates heat.

The utility model has the beneficial effects that: the dead head is arranged in the piston pin hole, can be of a common type or a heating type, can be of a spherical shape or a cylindrical shape, and is generally adopted; the shrinkage porosity at the second chill position moves upwards under the action of the chills, so that the riser can just fully feed the second chill, the shrinkage porosity at the first chill position can be undoubtedly fed, and meanwhile, oxide skin or secondary slag on the surface of molten iron can also fully float into the riser; the shrinkage defect of the part below the piston pin hole can be eliminated; slag phases generated by molten iron turbulence at important parts below the piston pin hole can be fully gathered and stored, and no casting defects at the pin seat and the pin hole are ensured.

Drawings

Other features, objects and advantages of the utility model will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic illustration of a piston according to the present invention that eliminates pin hole casting defects;

2-4 are schematic diagrams of arrangement of chill in the process of casting a piston in the prior art;

in the figure: 1 first chill, 2 second chills, 3 annular oil grooves, 4 piston pin holes, 5 piston tails, 6 risers, 7 piston tops and 8 oil guide inner cavities.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further described by combining the specific implementation structure.

Referring to fig. 1-4, the present invention provides a technical solution: the utility model provides a can eliminate piston of piston pinhole casting defect, this piston includes piston tail 5 and piston crown 7 of a body coupling, piston crown 7 is inside to have seted up and to lead oily inner chamber 8, it has piston pinhole 4 to violently have between piston crown 7 and the

piston tail

5, 4 inner walls of piston pinhole are provided with rising head 6, it is provided with first chill 1 near rising head 6 to lead oily inner chamber 8, annular oil groove 3 has been seted up to piston crown 7 inside, the below is provided with second chill 2 respectively about annular oil groove 3, the problem that current 4 casting in-process defects of piston pinhole were rectified rationally inadequately has been solved.

Referring to fig. 2, the most serious defect parts of the piston generally include a position 11, a position 22 and a position 33; the shrinkage porosity defect at position 22 can be easily solved by a chill or a riser, while the traditional structural measure for the defects at position 11 and position 33 is to provide a chill, which, although improved, tends to increase the possibility of another defect;

the general casting structure of the piston has two types:

the first scheme is as follows: this solution, as shown in fig. 3 (piston top up), allows to leave, as in fig. 2, the

positions

11, 22, 33 without defects, but the shrinkage defect moves up to the position 55, where it is common to have a shrinkage defect during the machining of the oil holes; meanwhile, the mud core of the cooling cavity at the position 44 floats upwards due to the buoyancy of molten iron, and a large number of air holes are formed due to the difficulty in exhausting gas generated by the mud core, so that the rejection rate is high, and the pouring structure is gradually cancelled.

Scheme II: as shown in fig. 4 (piston top down)

This solution also makes it possible to have casting defects in the

positions

11 and 55, in which the position 55 is present due to the fact that the position 22 in fig. 2 is provided with a chill, the shrinkage porosity being shifted upwards, which is difficult to eliminate because of the insufficient iron charge. In the past, the cold iron is arranged in the pin hole, only the shrinkage porosity at the position 11 is moved downwards, but the probability of slag inclusion and air hole defects at the position 11 is greatly increased.

As an embodiment of the present invention: referring to fig. 1, the riser 6 is arranged in the piston pin hole 4, the riser 6 can be a common type or a heating type, can be spherical or cylindrical, and generally adopts the heating riser 6; the shrinkage porosity at the position of the second chill 2 moves upwards under the action of the chills, the riser 6 can just fully feed the shrinkage porosity, the shrinkage porosity at the position of the first chill 1 can be undoubtedly fed, and meanwhile, oxide skin or secondary slag on the surface of molten iron can also fully float into the riser 6, so that the shrinkage porosity defect at the position below the piston pin hole 4 can be eliminated; slag phases generated by molten iron turbulence at important parts below the piston pin hole 4 can be fully gathered and stored, and no casting defects at the pin seat and the pin hole are ensured.

While there have been shown and described what are at present considered the fundamental principles and essential features of the utility model and its advantages, it will be apparent to those skilled in the art that the utility model is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Moreover, it should be understood that although the present description is described in terms of implementation structures, not every implementation structure includes only a single technical solution, and such descriptive structures of the present description are provided for clarity only, and those skilled in the art should integrate the description, and the technical solutions in the embodiments may be appropriately combined to form other implementation structures that those skilled in the art can understand.

Claims

1. The utility model provides a can eliminate piston pin hole casting defect, includes piston tail (5) and piston crown (7) of integrative connection, its characterized in that: the oil guide structure is characterized in that an oil guide inner cavity (8) is formed in the piston top (7), a piston pin hole (4) is transversely formed between the piston top (7) and the piston tail (5), a riser (6) is arranged on the inner wall of the piston pin hole (4), a first chiller (1) is arranged near the riser (6) in the oil guide inner cavity (8), an annular oil groove (3) is formed in the piston top (7), and a second chiller (2) is arranged on the inner side of the annular oil groove (3).

2. The piston of claim 1, wherein said piston is capable of eliminating casting defects in said piston pin bore, said piston further comprising: first chill (1), second chill (2) are the loop configuration, first chill (1), second chill (2) distribute inside piston top (7) along same perpendicular line.

3. The piston of claim 1, wherein said piston is capable of eliminating casting defects in said piston pin bore, said piston further comprising: the two risers (6) are arranged and are symmetrical about the center line of the piston, and the riser (6) is a heating riser (6).