Performance characteristics save costs
1 We increased the thickness of the hammer crusher hammer by 15mm, the end width increased by 20mm, the length of the suspension hole to the end increased by 10mm, and the radius of the outer circle at the suspension changed from 90mm to 75mm. The impact on the material has increased. Because the center of gravity of the hammer crusher’s hammer head moves radially outward in the turning radius, the linear velocity of the hammer crusher hammer increases during operation. The impact energy of the hammer crusher hammer on the material is increased, thereby improving the crushing effect.
2. The effective wear of the hammer crusher head has increased. The single weight of the hammer head is generally 27 kg, and the effective wear amount accounts for one third, that is, 9 kg. The improved structure has a small total weight change and an effective wear amount of 16 kg. The improved hammer set is equivalent to the two before the improvement, which reduces the use cost.
3． Reducing the particle size of the discharge and increasing the output at the table. After the improvement, the length from the suspension hole to the end of the hammer head is from 350 mm to 360 mm, the turning diameter is about 1250 to 1270 mm, and the gap between the hammer crusher and the shell plate is reduced from 25 mm to 15 mm. Therefore, the particle size of the output can be changed from less than 20 mm, 25% powder to 8-10 mm, 60% powder, which greatly improves the crushing effect of the crusher, thereby increasing the output at the table. .
4． Improved grinding effect. After the secondary crushing of limestone and other materials, the energy consumption and efficiency should be studied. The crushing efficiency is higher than that of grinding, and the power consumption is small. Therefore, it is required and desired that limestone be more broken and less ground. The output granularity is 8-10 mm, 60% of the powder, which greatly improves the production effect of the powder machine. The output is raised from 12 tons per hour to 16 tons per hour, which reduces the production cost of raw meal.
Hammer head forging is a processing method in which the metal is heated to a temperature of 700-1300 ° C, and the metal blank is pressurized with a forging machine to cause plastic deformation to obtain forgings with certain mechanical properties, shapes and sizes. One of the two major components of forging (forging and stamping). Forging can eliminate defects such as as-cast looseness caused by metal in the smelting process and optimize the microstructure. At the same time, the mechanical properties of the forging are generally better than those of the same material because the complete metal streamline is preserved. For the important parts with high load and severe working conditions in related machinery, in addition to rolled plates, profiles or welded parts with simpler shapes, more forgings are used.
Chemical composition Si Mn Cr S P
0.15-0.37 0.6-1.2 ≤0.25 ≤0.04 ≤0.04
Surface hardness of steel ball 50-60 (H R C)
Impact toughness of steel ball ≧ 12 (j / cm2)
1. Forging the heated metal material into tools, mechanical parts or blanks of various shapes, which is called forging. Forging can change the internal structure of metal materials, refine the crystals, and improve its mechanical properties.
2. Forging production must use heating equipment, forging equipment and many auxiliary tools.
3. Forging equipment mainly includes steam hammer, air hammer, die forging hammer, mechanical hammer, plywood hammer, spring hammer, belt hammer, crank press, friction press, hydraulic press, reamer, roll forging machine, etc.
Hammer head material
In general, the harder the hammer, the greater the abrasion resistance. To increase the abrasion resistance of the hammer head, it is necessary to increase its hardness, but as the hardness increases, the impact toughness of the hammer head will decrease. Therefore, how to take into account the appropriate hardness of the hammer head and good impact toughness is the key to improving the wear resistance of the hammer head. The materials commonly used for hammer heads are: high manganese steel, high chromium cast iron, and low carbon alloy steel. High manganese steel has good toughness, good workmanship, and low price. Its main feature is that under the action of large impact or contact stress, the surface layer will rapidly undergo work hardening, and its work hardening index is 5-7 times higher than other materials. The abrasion resistance has been greatly improved. However, if the impact force of the towel is not enough or the contact stress is small, the surface cannot be rapidly processed and hardened, and the wear resistance of high-manganese steel cannot be fully exerted. High chromium cast iron is a wear-resistant material with excellent wear resistance, but its toughness is low and brittle fracture is easy to occur. In order to ensure the safe operation of high chromium cast iron hammer heads, people have developed composite hammer heads, that is, high chromium cast iron is cast in the head of high manganese steel or low alloy steel hammer head, or the working part of the hammer head is made of high chromium cast iron, and the hammer shank part Carbon steel combines the two to make the hammer head have high hardness, while the hammer shank has high toughness. It takes full advantage of the two materials to overcome the shortcomings of a single material and meets the requirements of the hammer head performance. However, its manufacturing process is complicated and the process requirements are strict. Low carbon alloy steel is mainly alloy structural steel containing chromium, molybdenum and other elements. It has high hardness and good toughness. Its matrix structure includes martensite, bainite or bainite + martensite composite structure. The hardness of the hammer head is about HRC 45, and the impact toughness is d. ≥15 J / resistant. Under the same working conditions, its service life is at least 1 times longer than that of high manganese steel hammer heads. However, the quenching and tempering heat treatment of the hammer head is the key. After the quenching and tempering heat treatment, not only the overall tensile strength is required to be above 850 MPa, but also considerable plasticity and toughness.
Eternal Bliss Alloy Casting & Forging Co, Ltd.
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