In terms of structure, Jiangsu Yonghang Rail Transit Technology Co., Ltd. proposed the structure form of the split steel top and aluminum skirt piston according to the factory coefficient designed by the diesel engine. Using this form, we can fully solve the above problems. Due to the split structure, the piston The place where the working conditions are bad is at the top of the piston steel. Corrosive substances such as phosphorus and sulfur will continuously corrode the steel top of the piston. When the ship is overhauled, only the steel top needs to be changed, and the skirt below can continue to be used. Jiangsu Yonghang Rail Transit Technology Co., Ltd. puts itself in the shoes of customers to save every penny. In view of the continuous increase of the high explosion pressure of diesel engines, the split piston structure can use high-strength bolts, so that the original use of higher and better materials for the entire piston can be converted into high requirements for bolt materials, which not only ensures the strength requirements of the piston, but also reduces the piston. The production cost makes the pistons of Jiangsu Yonghang Rail Transit Technology Co., Ltd. always maintain a high cost performance in the market.

Piston skirt Jiangsu Yonghang Rail Transit Technology Co., Ltd. has improved the structural fatigue strength and high temperature fatigue life of materials in order to ensure the safe and reliable operation of the diesel engine, so as to meet the increasing requirements of the thermal load and mechanical load of the piston. Piston reliability. We are using a down-type combined piston. Due to the arrangement of the connecting studs, the requirements of oscillating cooling and the need to scrape oil and return oil from the oil ring, the piston skirt is arranged with bolt holes, elastic sleeve counterbore seating surfaces, oil inlet holes and return oil. Oil holes, etc., are prone to stress concentration. By adjusting the position, size, and quantity of each hole, the stress distribution state can be improved, the sensitivity of stress concentration can be reduced, and the strength of the piston can be increased. to solve the problem of insufficient structural strength of this part, and determine the improvement plan for retaining the forged fiber structure. The thermal analysis of the piston and the finite element calculation show that this improved structure can well improve the high stress at the bottom of the pin hole seat. The state of stress distribution in the region improves the fatigue strength of the piston skirt.

In terms of materials, Jiangsu Yonghang Rail Transit Technology Co., Ltd. uses high-quality A-grade heat-resistant alloy steel. From raw material procurement to processing to finished products, we strictly control and repeat the relevant parameters of the steel roof material in each link. detection. Jiangsu Yonghang Rail Transit Technology Co., Ltd. has a prudent and scientific attitude in the selection of bolt materials, specially set up a research group and established corresponding topics. Jiangsu Yonghang Rail Transit Technology Co., Ltd. starts from the whole machine and adopts high-strength aluminum alloy material. Due to the lightness of aluminum alloy, it not only ensures the strength of the piston, but also improves the power-to-mass ratio of the entire diesel engine.

In terms of processing technology, Jiangsu Yonghang Rail Transit Technology Co., Ltd. has carried out strict quality control from the beginning of steel top forging. We attach great importance to each process, and we strictly control the equipment and parameters in each process. , Repeated testing is carried out for each link. The entire processing of the steel roof is completed by large-scale high-precision CNC. For the processing of the cooling cavity of the steel roof, Jiangsu Yonghang Rail Transit Technology Co., Ltd. is equipped with special tools and technologies for each structure. Superb CNC technicians, so as to ensure the smoothness of the inner cavity and the structural strength of the steel top. Jiangsu Yonghang Rail Transit Technology Co., Ltd. attaches great importance to the problem that the friction between the steel top ring groove and the piston ring is easy to wear and larger. We set up a research group. After several years of repeated experiments, we finally successfully selected the high The selection of frequency quenching equipment, the configuration of the CNC system of the machine tool and the mature process parameters of ring groove quenching and hardening have greatly extended the life of the steel top after the ring groove hardening treatment. Customers only need to replace the relatively cheap piston rings, Jiangsu Yonghang Rail Transit Technology Co., Ltd. makes every one of our customers feel satisfied and at ease with our products. Piston Aluminum Skirt Jiangsu Yonghang Rail Transit Technology Co., Ltd. attaches great importance to the aluminum skirt forging process. Over the past few decades, Jiangsu Yonghang Rail Transit Technology Co., Ltd. has formed a complete set of mature materials for the forging and heat treatment process of aluminum skirts. The key control points in the skirt forging and heat treatment process form a complete set of control schemes, and the entire process is strictly controlled by advanced testing equipment. The entire processing of the aluminum skirt is also completed by large-scale high-precision CNC and machining centers. In view of the different thermal expansion coefficients of the steel roof and the aluminum skirt, Jiangsu Yonghang Rail Transit Technology Co., Ltd. starts from the structural parameters of the whole machine and applies advanced computer calculation programs to determine the longitudinal dimensions and horizontal dimensions of the outer circle of the steel roof and the aluminum skirt on the drawings. The ovality is separately designed and calculated, and this data is imported into a specially processed data machine, so as to obtain a perfect and accurate aluminum skirt.

In terms of surface treatment, Jiangsu Yonghang Rail Transit Technology Co., Ltd. still conducts professional surface treatment technology for the current characteristics of burning heavy oil on the top of the piston steel. Hardness, delaying the corrosion of heavy oil on the steel top of the piston, increasing the wear resistance of the piston, thereby increasing the service life of the piston. The piston skirt is blackened and a layer of lubricating material is bonded to the surface, so that the piston can move happily in the cylinder liner.