CN1760525A - Composite cylinder jacket and manufacturing method - Google Patents

Abstract

The invention discloses a composite cylinder liner and a manufacturing method thereof. The inner layer of the composite cylinder liner is an alloy cast iron layer, the outer layer is a cast steel layer, and the alloy cast iron layer and the cast steel layer are connected by an alloy cast iron layer and a cast steel layer. Pure copper bonding layer to the steel layer. The invention combines all the advantages of cast iron cylinder liners and steel cylinder liners. Except for changing the casting process, other cold processing, heat and chemical treatment processes and external dimensions are the same as the general cylinder liners, and the existing processing equipment can be fully utilized for processing; During use, the composite cylinder liner has the characteristics of good rigidity and high toughness, which can significantly improve the fatigue resistance and completely solve the problem of cylinder liner fracture; when the machine is running, a certain amount of lubricating oil can be stored in the reticulate pattern of the friction surface of the cylinder liner , In addition, cast iron contains a certain amount of graphite, so as to ensure reliable lubrication, reduce the possibility of cylinder scuffing and clogging, reduce friction, and realize high-efficiency and reliable output of internal combustion engines.

Description

A kind of composite cylinder liner and its manufacturing method

technical field

The invention relates to an engine cylinder liner.

Background technique

Most of the existing wet cylinder liners of internal combustion engines are made of cast iron, which has a disadvantage of high brittleness. During use, cracks and breakages often occur, which are likely to cause major accidents; the advantages of cast iron materials are good manufacturability, wear resistance, and The platform texture is processed, which is beneficial to shorten the running-in period. When the machine is working, a certain amount of lubricating oil can be retained in the texture, which provides good lubrication conditions for the normal operation of the machine. There are also cylinder liners made of steel, which has the advantages of good reliability and is not prone to cracks and fractures. The disadvantages are poor workmanship, high processing costs, difficult to process platform texture on the inner wall, poor oil storage capacity, and poor lubrication conditions. good.

Contents of the invention

The technical problem to be solved by the present invention is to provide a composite cylinder liner that improves the reliability and wear resistance of the cylinder liner, thereby prolonging its service life and preventing accidents.

Another technical problem to be solved by the present invention is to provide a method for manufacturing the composite cylinder liner.

In order to achieve the above object, the technical solution of the present invention is: a composite cylinder liner, the inner layer of the composite cylinder liner is an alloy cast iron layer, the outer layer is a cast steel layer, and the alloy cast iron layer and the cast steel layer are connected by alloy Pure copper bonding layer of cast iron layer and cast steel layer.

As an improvement, the inner wall of the alloy cast iron layer is processed with a platform pattern.

As an improvement, the outer wall of the cast steel layer is provided with a chrome-plated layer.

The method for manufacturing the composite cylinder liner comprises the following steps:

First cast and process the inner layer of the cylinder liner, an alloy cast iron layer, then process positive and negative spiral grooves for fixing on the outer wall of the alloy cast iron layer, then electroplate or spray a pure copper layer on the outer wall of the alloy cast iron layer, and lay a pure copper layer The purpose is to better combine and infiltrate the alloy cast iron and cast steel; after these works are completed, the cast steel layer is cast on the outer wall of the alloy cast iron layer. During the pouring process, the pure copper layer melts and penetrates to form a bonding layer, so that The alloy cast iron layer and the cast steel layer are closely combined, so that the blank of the composite cylinder liner is completed; the rest of the cold working process, heat, chemical treatment process and external dimensions are exactly the same as the ordinary alloy cast iron cylinder liner, and then a qualified cylinder liner can be processed. cylinder liner.

The composite cylinder liner of the utility model combines all the advantages of the cast iron cylinder liner and the steel cylinder liner, and abandons the shortcomings of the two. Except for changing the casting process, other cold processing, heat and chemical treatment processes and external dimensions are the same as the general cylinder liner. Make full use of existing processing equipment for processing; during use, the composite cylinder liner has the characteristics of good rigidity and high toughness, which can significantly improve the fatigue resistance and completely solve the problem of cylinder liner fracture; and is wear-resistant, using international advanced The platform texture honing technology is used to process the platform texture. When the machine is running, a certain amount of lubricating oil can be stored in the texture of the friction surface of the cylinder liner. In addition, the cast iron contains a certain amount of graphite, so as to ensure reliable lubrication and reduce cylinder scuffing. The possibility of holding cylinders reduces friction and realizes high-efficiency and reliable output of internal combustion engines.

Description of drawings

Accompanying drawing is the structural representation of the embodiment of the present invention.

Detailed ways

As shown in the drawings, a composite cylinder liner, the inner layer of the composite cylinder liner is an alloy cast iron layer 1, the outer layer is a cast steel layer 3, and the alloy cast iron layer 1 and the cast steel layer 3 are connected alloy cast iron layers 1 and a pure copper bonding layer 2 of cast steel layer 3. The inner wall of the alloy cast iron layer 1 is processed with a platform texture 4, which greatly improves the oil storage capacity of the cylinder liner and improves the lubrication between the cylinder liner and the piston.

The outer wall of the cast steel layer 3 is provided with a chrome-plated layer, which can prevent corrosion of the outer wall of the cylinder liner and improve the service life of the cylinder liner.

The method for manufacturing the composite cylinder liner comprises the following steps:

First cast and process the inner layer of the cylinder liner, an alloy cast iron layer 1, then process positive and negative spiral grooves for fixing on the outer wall of the alloy cast iron layer 1, then electroplate or spray a pure copper layer on the outer wall of the alloy cast iron layer 1, and lay The purpose of the pure copper layer is to better combine and infiltrate the alloy cast iron and cast steel; after these tasks are completed, the cast steel layer 3 is cast on the outer wall of the alloy cast iron layer 1. During the pouring process, the pure copper layer melts and penetrates. The bonding layer 2 is formed, so that the alloy cast iron layer 1 and the cast steel layer 3 are closely combined, so that the blank of the composite cylinder liner is completed; the rest of the cold working process, heat, chemical treatment process and external dimensions are completely the same as the ordinary alloy cast iron cylinder liner. The same, you can process a qualified cylinder liner.

The material used in the alloy cast iron layer 1 of the present invention is the same as that of the existing cast iron cylinder liner. And can make full use of the existing processing equipment and tooling and measuring tools, etc., and can easily process the platform texture 4; ensure the harsh use requirements of the internal natural machine wet cylinder liner.

Claims (4)

1. composite cylinder jacket, it is characterized in that: the internal layer of described composite cylinder jacket is alloy cast iron layer (1), skin is cast steel layer (3), is the fine copper binder course (2) that connects alloy cast iron layer (1) and cast steel layer (3) between alloy cast iron layer (1) and the cast steel layer (3).

2. a kind of composite cylinder jacket as claimed in claim 1 is characterized in that: the inwall of described alloy cast iron layer (1) is processed with platform reticulate pattern (4).

3. a kind of composite cylinder jacket as claimed in claim 1 or 2 is characterized in that: the outer wall of described cast steel layer (3) is provided with chromium coating.

4. make the method for composite cylinder jacket as claimed in claim 1, it is characterized in that: it may further comprise the steps:

At first cast, process cylinder liner internal layer one alloy cast iron layer (1), processed the positive and negative spiral chute of fixation then at the outer wall of alloy cast iron layer (1), then electroplate or the spraying pure copper layer at the outer wall of alloy cast iron layer (1), the purpose of laying pure copper layer is for alloy cast iron and better combination infiltration of cast steel; After these work are carried out, again at the outer wall of alloy cast iron layer (1) casting cast steel layer (3), in the casting process, pure copper layer melts infiltration thereupon, form binder course (2), alloy cast iron layer (1) and cast steel layer (3) are combined closely, the blank of composite cylinder jacket has just completed like this; Remaining cold machining process and heat, chemical treatment technology and boundary dimension are just the same with common alloy cast iron cylinder jacke, can process qualified cylinder liner.

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