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Forming technology and die design of exhaust pipe flange

What is an exhaust flange? Exhaust flange is a part that connects the pipes that make up the exhaust pipe, and is one of the key parts in the manufacture of automobile exhaust pipes, which is widely used in production. The shape and size of the part as shown in Figure 1, its material is SUS304 stainless steel, thickness of 1.5mm, large and medium volume production. The part in the work of the bolt through the hole, so that the two flanges are tightly connected, the flange with a gasket seal, tighten the nut, the gasket surface of the specific […]

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Correction of large flange after sectional blanking and assembly welding

Through the correction of severe deformation of large flanges after segmental welding, it is clear that the key to thermal correction lies in the establishment of an appropriate temperature gradient, out of the misconception that “high-temperature heating is effective, and summarize the approximate relationship between heating temperature and correction angle in order to guide the process of similar thermal correction. 1. Generation of deformation problem In petroleum, chemical and electric power industries, large flanges are widely used as fastening and sealing joints. Due to the large size, the production of large flanges often take the processing process of segmentation, grouping […]

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Hot extrusion process design of flange

Flanges are often used to connect pipes or equipment on various equipment, and are widely used in automotive, paper making, electric power and other industries. Because they often need to bear large loads and have strong air tightness in the process of use, they have strict requirements on their mechanical properties and shape structure [1-3]. According to the actual production needs, some flanges are processed by casting, machining [4], liquid die forging [5], isothermal plastic forming [6], etc., which have large machining allowance, low production efficiency, low material utilization rate, long processing cycle and other problems. In this paper, a […]

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Design and analysis of hot extrusion process for flange shaft

What are flanged shafts? Flanged shafts are important shaft parts in the automotive transmission system, and their main function is to support the transmission parts in rotary motion and transmit motion and power, and they are subjected to alternating loads in the harsh working environment, and in the production process they have to undergo heat treatment, forging, grinding and other steps that are prone to various defects [1-2]. The traditional forming process has low material utilization, large machining allowance, many forging steps and long production cycle [3-4], which makes the production cost very high and hinders the development of enterprises. […]

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Processing of 45# steel thin wall sleeve parts

The processing of thin-walled parts has been more difficult to solve, by discussing the thin-walled parts in the processing of easy to deformation, part size and surface roughness is not easy to ensure and other technical problems, the processing difficulties are analyzed, the process route and processing scheme is given, through the optimization, improve the clamping method, so as to effectively solve the thin-walled parts of this kind of turning processing problems, for the future processing of such thin-walled sleeve parts to provide a the process route and machining plan are given. Thin-walled parts are more and more widely used, […]

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Processing technology of thin wall parts

Thin wall parts have the characteristics of light weight, material saving and compact structure. However, thin-walled parts have poor rigidity and weak strength, and are very easy to deform in machining, which increases the shape and position error of parts, and is not easy to ensure the machining quality of parts. In this paper, the clamping of thin-walled parts, the rational selection of cutting tools, the selection of cutting parameters and the use of cutting fluid are analyzed to improve the machining accuracy of thin-walled parts and ensure the machining quality. The specific methods to solve the problems are pointed […]

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Analysis on machining method of small internal thread below M4

With the rapid development of NC machining technology, in aviation parts and high-precision laser packaging box parts, the traditional fitter tapping for small threads (threads below M4) can not meet the requirements of production efficiency and quality. Especially in high-precision laser packaging box, higher requirements are put forward for thread machining process, dimensional accuracy and thread surface quality. On stainless steel, kovar alloy, titanium alloy and other materials with high hardness, the tap is easy to break due to small thread diameter and poor tap rigidity; In machining high-precision oxygen free copper electronic parts, there are two difficult problems: burr […]

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Method for distinguishing forging crack, heat treatment crack and raw material……

There are many different types of cracks: raw material cracks, heat treatment cracks, forging cracks, etc., which can make people dizzy. How to identify them is a very important course, so that it is easy to find out exactly where the cracks occur in the process, and to analyze the causes of cracks. First of all, it is necessary to define the concept of “raw material cracks” and “forging cracks” first, and the cracks that appear after forging should be understood as “forging cracks”, except that the main factors leading to forging cracks can be further divided into The main […]

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Difference between cast iron and cast steel

The essential difference between cast iron and cast steel lies in the different chemical composition. In engineering, it is generally considered that iron is higher than 2% carbon content, and steel is lower than this value. Due to different components, the microstructure and properties are also different. Generally speaking, the plasticity and toughness of steel are good, which is characterized by good elongation, reduction of area and impact toughness, and the mechanical properties of iron are hard and brittle. Some cast iron also has some special properties. The specific analysis is as follows: Cast iron is an iron carbon alloy […]

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Production and application of JFE hot rolled chromium series stainless steel s……

In the past, the flange of exhaust pipe in high temperature environment near automobile engine was made of ordinary medium thick steel plate. In recent years, in order to reduce environmental load and improve vehicle fuel efficiency, vehicle exhaust temperature is increasing. In addition, due to the configuration of additional components such as EGR (exhaust gas recirculation) cooler, the exhaust pipe flange is required to have better high temperature durability and thin and lightweight. Under this demand background, CR series stainless steel plate with high temperature strength better than ordinary steel is used for exhaust pipe flange in high temperature […]

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