Process comparison analysis Raw material processing technology comparison process and process are consistent in the raw material processing technology. They do not process the hot rolled blank surface of the raw material before production, so that the surface of the hot rolled blank of the raw material is finally retained on the product. The characteristic of this process is that the surface of the hot rolled blank of the raw material is not processed, the processing procedure is reduced, and the work efficiency is improved. At the same time, the raw materials are saved and the material consumption is reduced; 'the presence of the surface of the raw material hot-rolled blank completely retains the fibrous structure formed during hot rolling; the heating method in the spring manufacturing process is relatively simple; due to the presence of the hot rolled blank surface of the raw material, heat Rolling surface defects are also present on the surface of the material, which is detrimental to the quality of the spring.
The comparison process of the spring support ring processing process is to first mill the tip of the material according to the unfolding length of the support ring. After the spring roll is formed, the grinding tip portion forms a support ring structure. At this time, the transverse cross-sectional shape of the support ring is from the cylindrical shape. Transition to a rectangle. The characteristic of this process is that the grinding process processes the material into a very standardized shape of the cross section of the support ring, which saves the raw materials; 'the material structure of the support ring part after the grinding is the whole fiber structure; since the grinding process processes the material A very standard support ring section, which requires the tip to be squared when the spring is rolled on the coil spring machine, thus increasing the difficulty of the spring coiling process. At the same time, in order to ensure the shape of the support ring is accurate, the coil spring adjustment process is added to the rolled spring, which is unfavorable for improving work efficiency; when the support ring is not adjusted smoothly, the spring end grinding work is increased; It is deformed by hot rolling, and the tip is prone to more serious oxidation problems and deformation defects generated when the tip is sharpened. The process and process are to use oxygen after rolling and heat treatment, and the acetylene cuts the end face of the spring to form a support ring structure. At this time, it is equivalent to a cylindrical cylindrical spiral which is bent by a plane obliquely within the length of the support ring, and its transverse cross section is a shape in which a circle intersects a straight line. The characteristics of this process are: the spring winding operation is simple, generally no need to set the coil adjusting process; 'cutting the spring end face on the special equipment, the spring free height is guaranteed, and the spring end flatness is guaranteed, therefore, the end face The amount of grinding is small; the fiber structure of the spring support ring part is cut after cutting, and the surface quality is improved by shot peening; using oxygen, acetylene cuts the end face of the spring, destroying the heat treatment structure of the spring end face, and cutting The surface of the spring end face is defective. The heat treatment organization problem can be eliminated by the end grinding part, and the surface defect problem can be completely eliminated by the end surface grinding. Process Analysis Through the above comparison, in the raw material processing process, the process and process do not treat the hot rolled blank surface of the raw material before production. Shot peening can play a certain role in the defects on the surface of the blank, but the use of shot peening for defects such as longitudinal cracks and longitudinal folds on the surface of the hot rolled blank generally cannot solve the problem. Since these defects are distributed along the longitudinal direction of the material, the problem is not obvious in the manufacturing process, and in the operation of the spring, the longitudinal crack and the longitudinal folding may become the source of cracks broken by the spring, which is very harmful.
The bogie spring is rolled in a high-temperature heating state, and the quenching is oil quenched, which makes the possibility of generating such a crack source during the manufacturing process extremely small, and the surface shot peening treatment eliminates this. A grinding trace avoids the possibility of forming a crack source during use. The motor oil condition has been greatly improved when the factory is doing the wheel set test. However, several cases were found and the reasons were analyzed. There were the following cases: the gearbox oil level was too high. When the factory performs the wheel-to-motor idle test, it supplies oil to the main fuel tank of the motor. The oil almost fills the entire fuel tank, not near the scale line. The gear box is not filled with oil and is supplemented by the motor holding shaft oil tank. This makes it difficult to ensure that the oil level of the gearbox is within the specified scale, causing individual motors to simmer due to excessive oil levels.
The oil return hole is blocked by the sealant. Although it is required to apply as little glue as possible to the oil return hole, the worker is still afraid to paint too little because of the fear that the gear box will seep, and as long as there is glue, it will inevitably block the oil return hole. When the gearbox oil level is too high, the gearbox oil can be placed in the normal position for testing. If the oil return hole is blocked by the sealant, the gear box should be disassembled for inspection, which is not convenient for production. In order to facilitate the oil return hole, the motor oil return hole area should be increased as much as possible.
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