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Rounded corners are one of those design features that seem to have no middle ground, or at least are not well known. Either the part does not have them and most or all edges are well defined, or the designer of the part decides to adopt the opposite route and each edge and corner is rounded with a certain size of fillet radius. Fillet is very useful in the design field, especially when the part is to be CNC machined, which will be our main assumption in the following example. This article will reveal that fillets are a bad idea,…

1. Minimize the number of parts Find ways to assemble parts. For example, many electronics enclosures use movable hinges instead of knuckle hinges. When routing, select a molded guide feature or use a thermoformed guide (such as an old LazerTag gun). Speaking of minimizing the number of parts 2. Built in fasteners Whenever possible, build assembly features directly into the part instead of using screws. Snap fit is usually equally safe and can be assembled without tools. Sometimes screws are necessary, but the economical use of fasteners may consume up to 50% of the assembly labor. It should be noted…

Whether it is supplier review, customer or peer factory visit, acquisition target evaluation, or internal on-site management, a lot of on-site observation is involved. However, due to time constraints, on-site observation often requires relevant personnel to have a good eye for quick assessment and judgment in a very short time. 1. The importance of on-site observation Field observation is the basis for continuous improvement. Toyota's Niichi Ono has made the best of the on-site observation. Even on the factory's day off, he will take the management personnel to the site and let them stand in the workshop quietly to observe…

01 Concept of surface roughness Surface roughness refers to the micro geometric form error composed of small spacing and small peaks and valleys on the machined surface, which can be understood as the unevenness of small spacing and small peaks and valleys during product processing. The smaller the micro geometric error of the machined surface is, the higher the surface accuracy is; On the contrary, it is lower. Surface geometry error: Roughness: the term reflecting the micro geometric shape error of the machined surface of the part is called surface roughness. The surface geometric shape error with wave distance less…

1. Resistance welding This is a kind of welding method using resistance heat as energy source, including electroslag welding using slag resistance heat as energy source and resistance welding using solid resistance heat as energy source. Resistance welding is generally a welding method that makes the workpiece under a certain electrode pressure and uses the resistance heat generated when the current passes through the workpiece to melt the contact surface between the two workpieces to realize the connection. Higher currents are usually used. To prevent arcing on the contact surfaces and to forge the weld metal, always apply pressure during…

1. Gas welding It is a fusion welding method that uses the heat generated when combustible gas burns in oxygen to melt the base metal welding joint to realize connection. Gas welding is a welding method using gas flame as heat source. The oxygen acetylene flame using acetylene gas as fuel is most widely used. Because the equipment is simple and convenient to operate, but the heating speed and productivity of gas welding are low, the heat affected zone is large, and it is easy to cause large deformation. Gas welding can be used to weld many ferrous metals, nonferrous…

1、 Arc welding Arc: a strong and lasting gas discharge phenomenon. There is a certain voltage between the positive and negative electrodes, and the gas medium between the two electrodes should be in an ionized state. When the welding arc is ignited, the two electrodes (one pole is the workpiece, the other pole is the filler wire or electrode) are usually connected to the power supply, contacted briefly and separated quickly. When the two poles contact each other, a short circuit occurs, forming an arc. This method is called contact arc striking. After the arc is formed, as long as…

1. Brazing The energy source of brazing can be either chemical reaction heat or indirect heat energy. It uses a metal with a melting point lower than the melting point of the material to be welded as the filler metal. After heating, the filler metal is melted. The capillary action moves the filler metal into the gap of the joint contact surface, wets the surface of the metal to be welded, and makes the liquid phase and solid phase mutually diffuse to form a brazed joint. Therefore, brazing is a solid and liquid phase welding method. Characteristics and Application of…

At present, as the leading industry of China's national economy, the mechanical processing industry is still the main support for China's economic growth; As an important support for economic and social development, the mechanical processing industry is the main channel of urban employment in China and the concentrated embodiment of international competitiveness. However, from the current performance, there is still a big gap between the development of China's machining industry and that of the western manufacturing powers. The road of lean transformation and development of China's mechanical processing industry is obstructed frequently, and there is a long way to go.…

The main function of shaft parts is to support other rotating parts to rotate and transmit torque, and at the same time, it is connected with the machine frame through bearings. It is one of the important parts of the machine. Shaft parts are rotary parts, whose length is greater than the diameter, and are usually composed of cylindrical surface, conical surface, internal hole, thread and corresponding end face. The shaft often has splines, keyways, transverse holes, grooves, etc. According to functions and structural shapes, shafts have many types, such as smooth shaft, hollow shaft, half shaft, stepped shaft, spline…