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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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How to realize rapid cooling of 316L stainless steel weld in welding

316L stainless steel belongs to austenitic stainless steel, which has good plasticity, toughness, corrosion resistance and excellent comprehensive properties. How to realize rapid cooling of 316L stainless steel weld in welding? In order to study the effect of cooling mode on 316L weld? Which one is the most economical, we conducted the following experiments. We conducted a welding test on 316L stainless steel, using electrode arc welding (SMAW). The 316L stainless steel plate used in the test was 40mm thick, 55 ° X-shaped equilateral groove and 1mm blunt edge. 1g flat welding position was adopted for welding. The diameter of […]

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What should we pay attention to when changing hydraulic test to pneumatic test

When hydrostatic test is difficult Generally, the safety of hydrostatic test is higher than that of pneumatic test. In case of danger, the damage is less. Therefore, hydrostatic test is used most of the time. In the capacitance regulation, also listed in some cases can do air pressure test. For example, due to structural or support reasons, or operating conditions do not allow residual test liquid pressure vessel, you can choose to use air pressure test or gas-liquid mixture test. With the large-scale equipment, urgent schedule, many times the hydraulic test to achieve a lot of difficulties. For example, large […]

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Flange seals and gaskets

In petrochemical plants, flange is one of the most important and common forms of connecting pipes, pipe fittings, valves, instruments and equipment. Although this connection has the advantages of convenient disassembly and no hot work, because the sealing is realized by the cooperation of flange, bolt and gasket, the problem of any element will cause leakage, which will not only cause waste, but also pollute the environment, and even cause casualties and property loss. Therefore, today I will explain the relevant knowledge of flange sealing in detail. Sealing of flange Flange connection should be exactly bolt, flange and gasket connection, […]

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Q & A on heat exchanger technology

How to classify the heat exchange equipment? A: According to the “Petrochemical Corporation Equipment Classification Catalogue” can be divided into: (1) Shell and tube heat exchanger (2) Casing-type heat exchanger (3) Water immersion heat exchanger (4) Spray type heat exchanger (5) Rotary (snake tube) type heat exchanger (6) Plate heat exchanger (7) Plate fin heat exchanger (8) Tube and fin heat exchanger (9) Waste heat boiler (10) Other How does the heat exchanger transfer heat? A: In the most common inter-wall heat exchanger, the two main ways of heat transfer are conduction and convection. The thermal fluid first convection to […]

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