Danfoss Motor - Automotive Motor Linerless Technology: Surface Roughening
With the increasingly strict standards of vehicle emissions and fuel consumption, the entire automotive industry is facing the challenge of energy conservation and environmental protection. In order to reduce fuel consumption and exhaust emissions, the traditional method is to reduce the weight of the car, so the aluminum alloy Motor block replaces the cast iron cylinder. The body has become a development trend. In addition, the combustion efficiency of the Motor can be significantly improved by reducing the friction inside the Motor. A new type of automotive Motor technology—the cylinderless technology—has attracted the attention of many automakers.
Automobile Motor cylinderless technology refers to the introduction of thermal spray technology in the Motor block production process to spray a layer of wear-resistant low-carbon alloy coating on the surface of the pre-processed aluminum Motor cylinder hole, replacing the traditional cast iron cylinder liner, after spraying The cylinder is still a one-piece cylinder. The process of cylinderless cylinders mainly includes: casting, roughing, roughening of cylinder bore surface, preheating, spraying, finishing, honing. Below the Danfoss Motor , one of the key processes of the cylinderless technology and the roughening of the cylinder bore surface are briefly described:
The purpose of surface roughening is to increase the surface area, form a surface structure that mechanically bonds the coating to the surface of the substrate, increase the mechanical bond of the coating to the substrate, and activate the surface to further enhance the coating and the substrate. The bonding strength of the material. There are various ways to roughen the surface, such as sandblasting, machining roughening, high-pressure waterjet roughening, etc. Among them, sandblasting is the most commonly used roughening treatment, which is suitable for roughening all metal surfaces. The metal can be cleaned, roughened and highly active after blasting. The roughened surface needs to be cleaned with oil-free high-pressure dry air before spraying. Machining roughening is the machining of the surface of the aluminum cylinder into a certain contour. It adopts a single-axis machining center and adopts a Marpa knife. It has the characteristics of high efficiency, low machining cost and one-time processing, but When the cast iron cylinder block is roughened, the tool wear is large and the economical applicability is poor. High-pressure waterjet roughening is only applicable to aluminum cylinders. It is not suitable for cast iron cylinders. It does not use abrasives. It directly washes the surface of the substrate with a liquid jet. After roughening, it only needs to be dried, but the surface roughness value is relatively low.
Surface roughening is a key process in the cylinderless technology, which directly affects the bonding strength and coating performance of the coating. Therefore, in the process of cylinderless cylinder processing, it is necessary to pay attention to the surface roughening process and select the appropriate roughening method. , to achieve the best activation surface and production efficiency.
