Category: Manufacturing Technology knowledge

The full name of bearing steel is rolling bearing steel. It has high compressive strength and fatigue limit, high hardness, high wear resistance and certain toughness, good hardenability, and strict control on sulfur and phosphorus. It is a kind of high-grade and high-quality steel that can be used as cold tool steel. Specific gravity: 7.81 （1） Forging temperature of bearing steel (1) Initial forging temperature: 1150 (1120), final satin temperature: 850 (800) degrees. (2) The surface defects shall be removed before forging, and it shall be heated rapidly after preheating as far as possible. (3) During warm processing, the blue…

Aluminum oxidation aluminum alloy casting is generally made by metal mold. Metal aluminum and aluminum alloy have good fluidity and plasticity, but they are easy to blacken during use. What is the matter? 1. The process design is unreasonable. Improper treatment of aluminum alloy die castings after cleaning or pressure inspection creates conditions for aluminum alloy die castings to become moldy and black, and accelerates the formation of moldy. 2. Warehouse management is not in place. When aluminum alloy die castings are stored at different heights in the warehouse, their mildew conditions are different. 3. Internal factors of aluminum alloy.…

There are mainly the following methods to obtain the dimensional accuracy of workpiece in machining: (1) Trial cut method That is, first try to cut a small part of the machined surface, measure the size obtained by the test cutting, properly adjust the position of the cutting edge of the tool relative to the workpiece according to the processing requirements, try to cut again, and then measure. After two or three times of test cutting and measurement, when the machined size meets the requirements, cut the entire surface to be machined. The trial cutting method is repeated until the required…

The difference between extrusion blow molding and injection blow molding of plastic bottles is that in injection molding, the mold used to mold the plastic bottle body should include male mold and female mold. The injection machine injects the plastic melt into the mold cavity under high pressure. When opening the mold cavity, the male mold must be removed from the female mold to eject the bottle body. In extrusion blow molding, the extrusion die is used for molding. Blowing mold is mainly composed of two halves of female mold. Generally, male mold is not required, and the parison is…

Die standard: die base (GB/T2851-2861); Steel plate formwork (JB/T7181-7188); Parts and technical conditions (JB/T7642-7652); Round punch and round die (JB/T5825-5830); Standard for plastic injection mold: parts (GB4169-4170); Medium and small mold bases and technical conditions (GB/T12556.1-2); Large formwork and technical conditions (GB/T12555.1-15); Die casting die standard: Die casting die parts and technical conditions (GB4678-4679); Forging die standard: general forging module size series and measurement method (JB/T5900); Diamond wire drawing die (JB3944-85); Technical Conditions for Die Acceptance (GB/T14662-93); Technical Conditions for Stamping Die Steel and Its Heat Treatment (JB/T6058-92); Technical Conditions for Die Base (JB/T8050-95); Precision inspection of die base (JB/T8071-95).…

At present, the common sense of electronic component selection is more and more widely used in modern times. It is worth learning. Now we will have a deep understanding of the common sense of electronic component selection. a. Correctly select the resistance value and error of the resistor: Selection of resistance value: The principle is that the smaller the difference between the nominal resistance value of the resistor used and the required resistance value, the better. Error selection: the error of the resistor required by the time constant RC circuit should be as small as possible, generally within 5%. For…

Due to different stamping processes and working conditions, there are many reasons for the die bursting. The following is a comprehensive analysis of the reasons for the bursting of the die in terms of the design, manufacture and use of the die, and find out the corresponding improvement measures. 1. The mold material is poor and easy to be broken in subsequent processing The service life of dies made of different materials is often different. For this reason, two basic requirements are put forward for the materials of the working parts of the stamping die: ① The service performance of…

The so-called investment casting process is simply to use fusible materials to make a fusible model, Several layers of special fire-resistant coating "paint" are coated on it. After drying and hardening to form a whole mold shell, the mold is melted off from the mold shell with steam or hot water, then the mold shell is placed in the sand box, and the dry sand molding is filled around it. Finally, the mold is put into the baking furnace and baked at high temperature (if high-strength mold shell is used, the demoulded mold shell can be directly baked without molding)…

V-method casting originated in Japan, and got a good development in the 1980s. Seven or eight second-hand production lines have been introduced into China. Today, there are still 64 production lines in Japan, large or small, engaged in V-method casting. The materials include cast steel, cast iron, cast aluminum and cast copper. The casting types are mainly hydraulic components, military products, precision castings and colored artworks. V method has good surface finish, high dimensional accuracy, low production cost, energy conservation and environmental protection, but not all of these advantages are reflected in the same casting at the same time, so…

The sheet metal industry is one of the most important application markets of laser processing. The huge potential market in China also provides a broad space for large-scale application of laser processing machine tools in the sheet metal industry. With the intensification of competition, the profit space of each stage of the sheet metal industry chain is being compressed, and the space for price reduction is decreasing. The competition in China's sheet metal market will turn into the competition of high-quality and high-tech products. In order to comply with the development trend of the international market, the sheet metal processing…