The metal objects are pressed and shaped by plastic deformation

Noise and vibration: The forging hammer will inevitably produce low-frequency noise and vibration, but it may also have a certain high-frequency component, and its sound pressure level is between 95 and 115 decibels. Atmospheric pollution: The air in the workplace may contain smoke, carbon monoxide, carbon dioxide, sulfur dioxide, or acrolein, the concentration of which depends on the type of heating furnace fuel and the impurities contained, as well as the combustion efficiency, airflow and ventilation. They are all exposed to the same harmful environment and occupational hazards; in large forging workshops, the hazards vary from job to job. The original state of the material is bar, ingot, metal powder and liquid metal. Workers exposed to forging vibration may cause imbalances in temperament and functionality, Model 53 Series Pneumatic Components which will reduce work ability and affect safety. This force is typically achieved through the use of hammers or pressure. However, the price of powder is much higher than the price of general bars, and its application in production is limited., the organization becomes tighter, improving the plasticity and mechanical properties of the metal. What are the characteristics of forgings compared with castings? After forging, metal can improve its structure and mechanical properties. In small manual forging, all these operations are carried out in a small place by several forges. The mechanical properties of castings are lower than those of forgings of the same material. In addition, the forging process can ensure the continuity of the metal fiber structure, keep the fiber structure of the forging consistent with the shape of the forging, and the metal flow line is complete, which can ensure that the parts have good mechanical properties and long service life. Liquid metal die forging is a forming method between die casting and die forging, and is particularly suitable for complex thin-walled parts that are generally difficult to be formed by die forging. Ingots are only used for large forgings. 1. The forging process includes: cutting the material to the required size, heating, forging, heat treatment, cleaning and inspection. The heating temperature, opening temperature and final forging temperature of different materials have strict requirements. The internal structure of the powder forging is uniform, without segregation, and can be used to manufacture small gears and other workpieces. 2. In the cold season, exposure to changes in the microclimate environment may promote its adaptability to a certain extent, but rapid and too frequent changes may constitute a health hazard. In smaller forging workshops or far away from the heat source, the Baha's heat stress index is usually 55 ~ 95; but in large forging workshops, the working point close to the heating furnace or the drop hammer machine may be as high as 150 ~ 190. General small and medium-sized forgings use round or square bar stock as blanks. The ingot is a cast structure with large columnar crystals and loose centers. After hot working and deformation of the casting structure, the original coarse dendrites and columnar grains become fine-grained and uniform-sized equiaxed recrystallized structures due to the deformation and recrystallization of the metal, so that the original segregation, The compaction and welding of looseness, porosity, slag inclusion, etc. The casting process builds an exquisite granular structure and improves the physical properties of the metal. The amount of perspiration per 8 hours of labor will vary with the small gas environment, physical exertion and degree of thermal adaptability. Working conditions Although working conditions vary depending on the type of forging, they have certain common characteristics: moderate-intensity manual labor, dry and hot microclimate environment, noise and vibration, and air pollution by smog. 1. Heat plus metabolic heat will cause heat dissipation disorders and pathological changes. However, due to the relatively narrow plastic zone of these alloys, the forging difficulty will be relatively large. As long as the heating temperature and deformation conditions are reasonably controlled, forgings with excellent performance can be forged without large forging deformation. The forging powder is close to the density of general die forgings, has good mechanical properties, and has high precision, which can reduce subsequent cutting processing. Workers are exposed to high-temperature air and heat radiation at the same time, causing heat to accumulate in the body.. Apply static pressure to the liquid metal poured in the die cavity to make it solidify, crystallize, flow, plastically deform and form under the action of pressure, and you can obtain the forgings of the desired shape and performance. Forging materials in addition to the usual materials, such as carbon steel and alloy steel of various compositions, followed by aluminum, magnesium, copper, titanium and their alloys, iron-based superalloys, nickel-based superalloys, cobalt-based superalloys The deformed alloys are also completed by forging or rolling., to obtain objects with a certain shape, size and performance. Different forging methods have different processes, of which the hot die forging process is the longest. Therefore, it is necessary to break the columnar crystals into fine grains and loosen and compact them through large plastic deformation to obtain excellent metal structure and mechanical properties. It is easy to cause salt deficiency and heat cramps. The general sequence is: forging billet blanking; forging billet heating; roll forging blank; die forging forming; trimming; intermediate inspection, inspection forging Size and surface defects; heat treatment of forgings to eliminate forging stress and improve metal cutting performance; cleaning, mainly to remove surface oxide scale; correction; inspection, general forgings have to undergo appearance and hardness inspection, and important forgings have to undergo chemical composition analysis , Mechanical properties, residual stress and non-destructive testing. The grain structure and mechanical properties of the bar are uniform and good, the shape and size are accurate, and the surface quality is good, which is convenient for mass production.5 and 5 liters, or even higher. Castings are metal shaped objects obtained by various casting methods, that is, smelted liquid metal is poured into pre-prepared casting molds by pouring, injection, suction or other casting methods, and after cooling, the sand is dropped, cleaned and after Processing, etc.Forging materials are mainly carbon steel and alloy steel of various compositions, followed by aluminum, magnesium, copper, titanium and their alloys. The forgings are metal objects that are pressed and shaped by plastic deformation to the required shape or suitable compression force. In the actual use of components, a correct design can make the particle flow in the direction of the main pressure. The powdered metallurgical preforms that have been compacted and sintered can be made into powder forgings by flashless die forging in the hot state. The ratio of the cross-sectional area of ​​the metal before deformation to the cross-sectional area after deformation is called the forging ratio. Precision die forging and cold extrusion The forgings produced by hot extrusion and other processes are all unmatched by castings. Correct selection of forging ratio, reasonable heating temperature and holding time, reasonable initial forging temperature and final forging temperature, reasonable deformation amount and deformation speed are very important for improving product quality and reducing costs. It is generally between 1