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Reducing the internal stress of products is the key to the injection molding of heat-resistant ABS. In this paper, the author shared the processing points of heat-resistant ABS resin molding from five aspects, including mold design, material drying, molding temperature, holding pressure and time, and mold temperature. The heat resistance of ordinary ABS is not good enough. Now, by adding ɑ- A series of heat-resistant ABS resins have been developed with heat-resistant agents such as methyl styrene copolymer and N-phenyl maleimide copolymer. The HDT is 90-120 ℃. For example, the Economic&Easy series heat-resistant ABS resin of Shanghai Jinhu Rili can…

Mold manufacturing technology A new precision and high processing and forming method In modern processing and manufacturing, mold parts are generally formed in three ways, namely, removing forming, adding/stacking forming, and net/forced forming. The technology of RP_rapidprototyping, which appeared in the late 1980s, belongs to the addition/accumulation molding in object forming. Rapid prototyping technology is a very important kind of modern advanced manufacturing technology. It can quickly respond to market demand in the manufacturing of molds, and is the most significant innovation in the field of manufacturing technology in the past 20 years. Based on the principle of discrete manufacturing,…

（1） Influence of Surface Quality on Wear Resistance of Parts The wear resistance of parts is related to the materials, lubrication and surface quality of friction pairs. The wear process can be divided into three stages. The first stage is called the initial wear stage. At this time, the two surfaces only contact at the top of some peaks. The actual contact area is much smaller than the theoretical contact area, and the peak contact part will generate greater pressure. The rougher the surface, the smaller the actual contact area, and the greater the pressure at the crest, so the…

Common Sense I of Die Casting: Analysis of Damage Causes of Die Casting Die Mold damage analysis: In die casting production, the most common forms of mold damage are cracks and cracks. Stress is the main cause of die damage. Thermal, mechanical, chemical and operational shocks are all sources of stress, including mechanical stress and thermal stress. The stress is generated from: 1. During mold processing and manufacturing 1) Quality problems of blank forging Some molds have cracks after only a few hundred pieces are produced, and the cracks develop rapidly. It is possible that only the external dimensions are…

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…