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Steel Belt: Peening Shot
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Peening Shot Peening shot are involved in shot peening process. This peening shot are normally in small size of particular which are made from Carbon Steel and Stainless Steel. Most properly the peening shot are in spherical shape to avoid any micro damage on Stainless Steel Belts.Peening Shot must be predominantly round. When shot breaks down from usage, the broken shot must be removed to prevent surface damage upon impact. Peening Shot must be of uniform diameter. The impact energy imparted by the shot is a function of its mass and velocity. Larger shot has more mass and impact energy. If a mixed size batch of shot is used for peening, the larger shot will drive a deeper residual compressive layer. This results in a non-uniform residual compressive layer and will correlate into inconsistent fatigue results. To properly remove undersized and oversized Shots, some company utilizes a screening system. To properly remove broken shot, they meters the shot to a spiral separator consisting of inner and outer flights. The system is based on the rolling velocity of spherical Shot versus broken shot. Shot will arrive via the channel above the cone near the top of spiral separation system. The Shot will fall to the cone and roll down the inner flight. Spherical shot will gain enough velocity to escape to the outer flight. This shot can be reused. Broken down shot rolls very poorly and will stay on the inner flight where it will be discarded. Shot Peening Process Shot Peening is an innovative remedial solution for deformed Steel Belts. It offers a quick, onsite, cost effective method of flattening out deformed Steel Belts without interrupting production. In order to run the shot peening unit at the site it is necessary to build a simple frame in which the unit can be guided across the width of the belt. However, this frame can be stored at site and used again on the next occasion. There is also a need for a substantial air supply to operate the shot peening unit. This is usually not a problem since most plants have their own air supplies with suitable pressure. If this is not the case then compressors are available for hire in most places. The experience gained so far is extremely positive. Press belts of virtually any kind and all over the world have been successfully flattened using the shot peening technique. Shot peening is the most economical and effective method of producing and making surface residual compressive stresses to increase the product life of treated metal parts. Shot peening is also used for work hardening to improve wear characteristics, straightening distortions, surface texturing and for creating aerodynamic curvatures for aerospace designs. The increased strength of treated parts allows for lighter-weight parts that exhibit high wear and fatigue resistance. Steel Belt Curvature Steel Belts can often develop a cross curvature due to several factors such as; Stress Relief, Frictional Wear, Compressive Stress, Production Damage etc. The bigger and more complex Steel Belt, the more the stresses. These stresses can cause distortions in the part long term. If the parts are clamped in service, then cracking could occur. Also hole locations can change causing them to go out of tolerance. Compression Stress is the stress on materials that leads to a smaller volume. By Compression Stress the material is under compression. One can increase the compression stress until compression strength is reached. If over compression strength mean the Steel Belt will be damaged. The Cross curvature can be either Concave or Convex (with reference to the production surface) depending on how the curvature has been induced. 
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