Piston with metal core

Abstract

The utility model discloses a piston with a metal core, which comprises a piston body, an insert, a metal shell, a water passing hole B, a water channel and a water passing hole A. The insert is arranged at the head position of the piston body, the metal shell is arranged in the piston body on one side of the insert, the water channel is arranged between the metal shell and the piston body in an intercommunication mode, and the water passing hole A is communicated with the water channel. By arranging the metal shell, a salt bath ceramic core structure in an original manufacturing process of the piston body is replaced, the phenomenon that gas is generated after the salt bath ceramic core structure is filled with molten metal is avoided, meanwhile, the metal shell is good in strength and rigidity and high in manufacturing efficiency and does not break, crack, deform or generate gas, and the situation that the wall thickness of a product changes greatly or even is perforated is avoided; and as the non-gas-forming casting is not prone to generating the defects of air holes, sand holes and the like, the compactness of the casting can be greatly improved, and the percent of pass is greatly increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to the piston casting technical field, especially a piston with metal core. BACKGROUND

[0002] The piston is the key part on the automobile and ship engine, changes linear motion into rotary motion, provides power for the automobile and ship, and the piston also seals the combustion chamber, if the piston is not sealed well, the gas in the combustion chamber will leak, causes the engine power to drop, the fuel economy to be poor, cannot guarantee that the engine works stably and efficiently, and the engine of large ship and warship is more strictly required, and a good engine cannot be separated from high-quality piston.

[0003] When the traditional piston is cast, the salt bath ceramic core structure needs to be made, is lowered into the cavity, is immersed in water after casting, the salt is dissolved quickly, the sand core is cleaned out from the water hole, and the water channel is formed, and the shortcoming is that the salt bath core manufacturing cost is high, the efficiency is low, the pressure bearing capacity is poor, and there are many problems in gravity and low-pressure casting, and it is more difficult to adapt to high-pressure and high-efficiency production process like liquid die forging, the core is deformed, cracks or collapses under the action of the filling force of aluminum water and other forces after being lowered into the cavity, the salt bath core is made of various organic and inorganic substances, and gas is generated after the metal liquid fills, and a series of problems lead to that the piston product wall thickness changes greatly or even perforation, the water channel is thick, sand is adhered, and is rough, the casting has defects such as air hole and sand eye, the casting air tightness is poor, the water channel cross-sectional area changes greatly, and the qualified rate is low, therefore, the utility model provides a piston with metal core. UTILITY MODEL CONTENTS

[0004] The utility model discloses a piston with metal core, which replaces the salt bath ceramic core structure in the original manufacturing process of the piston body by setting a metal shell, avoids the generation of gas after the salt bath ceramic core structure is filled with metal liquid, and has high strength and rigidity, high manufacturing efficiency, no collapse, no cracking, no deformation, no gas generation, no product wall thickness change or even perforation, no thick water channel or roughness, no air hole defects, no sand eye defects, high casting density, high qualified rate, and effective solution to the problems in the background art.

[0005] To achieve the above object, the utility model adopts the technical scheme that

[0006] A piston with a metal core, comprising a piston body, further comprising an insert, a metal shell, a water hole B, a water channel and a water hole A, the piston body is provided with an insert at the head position, and a metal shell is arranged in the piston body on one side of the insert, a water channel is arranged between the metal shell and the piston body, and a water hole A and a water hole B are symmetrically arranged below the piston body of the metal shell.

[0007] Further, the hole cavities of the water hole A and the water hole B are communicated with the water channel of the piston body;

[0008] By adopting the above technical scheme, the water hole A, the water hole B and the water channel of the piston body are communicated by liquid.

[0009] Compared with the prior art, the piston has the following beneficial effects:

[0010] The metal shell is arranged, so as to replace the salt bath ceramic core structure in the original manufacturing process of the piston body, gas generated after the salt bath ceramic core structure is filled with metal liquid is avoided, the metal shell has good strength and rigidity, high manufacturing efficiency, no collapse, no cracking, no deformation, no gas, no large wall thickness change or even perforation, no thick and rough water channel, no gas hole defect, no sand eye defect, casting compactness is greatly improved, and the qualified rate is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a whole structure schematic view of the piston with a metal core.

[0012] Figure 2 It is a bottom view of the piston body with a metal core.

[0013] Figure 3 It is Figure 2 C-C position sectional view.

[0014] In the figure: 1, piston body; 2, insert; 3, metal shell; 4, water hole B; 5, water channel; 6, water hole A. DETAILED DESCRIPTION

[0015] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the utility model is further described in combination with specific embodiments.

[0016] For example Figures 1-3As shown, a piston with a metal core, comprising a piston body 1, also comprising an insert 2, a metal shell 3, a water hole B 4, a water channel 5 and a water hole A 6, the insert 2 is arranged at the head position of the piston body 1, and the metal shell 3 is arranged in the piston body 1 on one side of the insert 2, the water channel 5 is arranged between the metal shell 3 and the piston body 1, and the water hole A 6 and the water hole B 4 are symmetrically arranged below the piston body 1.

[0017] Among them, the hole cavity of the water hole A 6 and the water hole B 4 is communicated with the water channel 5 of the piston body 1;

[0018] By adopting the above technical scheme, the water hole A 6, the water hole B 7 and the water channel 5 of the piston body 1 are communicated by liquid.

[0019] It should be noted that the utility model is a piston with a metal core, and the utility model discloses a metal shell 3, when the wall thickness of the metal shell 3 is insufficient, the metal shell can be filled with salt bath sand and other fillers, when the piston body 1 is made, the metal shell 3 can be lowered into the cavity for casting, so that the salt bath ceramic core structure in the original manufacturing process of the piston body 1 is replaced, gas generated after the salt bath ceramic core structure is filled with metal liquid is avoided, meanwhile, the metal shell 3 has high strength and rigidity, high manufacturing efficiency, and does not collapse, crack, deform or generate gas (especially suitable for liquid die forging, a high-pressure and high-efficiency process), and cannot cause large wall thickness change or even perforation of the product, and the water channel 5 cannot be thick and rough, because the casting without gas generation is not easy to produce pores, and has no sand eye and other defects, so that the compactness of the casting can be greatly improved, and the qualified rate can be greatly improved.

[0020] It should be noted that the utility model is a piston with a metal core, and the components in the utility model are components known to those skilled in the art, and the structure and principle thereof can be known by technical personnel through a technical manual or through a conventional experimental method.

[0021] The basic principles and main features of the utility model and the advantages of the utility model are shown and described above. Those skilled in the art should understand that the utility model is not limited to the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the utility model, and various changes and improvements can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A piston with a metal core, comprising a piston body (1), characterized in that: It also includes an insert (2), a metal shell (3), a water passing hole B (4), a water channel (5) and a water passing hole A (6), the head of the piston body (1) is provided with an insert (2), and the piston body (1) on one side of the insert (2) is provided with a metal shell (3), the metal shell (3) and the piston body (1) are provided with a water channel (5) in communication, and the piston body (1) below the metal shell (3) is symmetrically provided with a water passing hole A (6) and a water passing hole B (4).

2. A piston having a metal core as defined in claim 1, characterized in that: The hole cavities of the water passing hole A (6) and the water passing hole B (4) are in communication with the water channel (5) of the piston body (1).

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