Who uses the spray/blasting process?
At present, the spray/blasting strengthening process has been widely used in the automotive industry. Any metal component that is subjected to cyclic stress and subjected to cyclic stress needs to rely on the spray/blasting process to improve the fatigue life of the component.
In the automotive industry, spray/blasting reinforcement is mainly used for the reinforcement of key parts such as coil springs, leaf springs, torsion bars, gears, transmission components, bearings, camshafts, crankshafts, and connecting rods.
Modern spray/blasting equipment must meet the following requirements:
Simultaneous monitoring of process parameters <br> <br> have a copy stored procedures and functions of self-diagnostic maintenance, wear and tear can be detected easily accessible to all parts, easy to maintain a common operating principles, can adapt to different customer requirements completely it is important to control the constant coverage program stable, repeatable performance resulting low noise and low dust emission <br> <br> strengthen the following parameters <br> <br> strengthening closely monitored parameters:
Injection angle enhancement time and pressure nozzle tracking speed (shot peening)
Head rotation speed (shot peening)
Workpiece Speed ​​or Conveying Speed ​​Pellet Shape and Size Pill Flow Bending Fatigue Bending fatigue is the most common fatigue mode. This problem can be solved quickly with shot peening because the surface is where the tensile stress is most concentrated. The residual tensile stress zone formed by the part is subjected to stretching, and when the bending load is applied, the surface thereof is subjected to fatigue cracking or stress corrosion cracking. The effect of tensile stress can be counteracted by introducing a compressive stress to enhance the ability of the workpiece to resist fatigue failure.
<br> <br> gear to gear peening is a very common type of application. Gears of any size or design can be improved by shot peening to improve the bending fatigue resistance of the gear roots. The load generated on the gear contact surface forms a bending stress at the root region under the contact point.
Gears are usually shot peened after carburizing or surface hardening. The increased surface hardness forms compressive stress in the same proportion. Depending on the parameters of carburizing and shot peening, the maximum residual compressive stress of the gear after carburizing and strengthening treatment falls between 170-230 ksi (1170-1600 MPa). For shot peening of carburized gears, high hardness pellets (55-62 HRC) are usually used. Of course, it is also possible to use a smaller hardness projectile (45-52 HRC) depending on the situation, which produces a compressive stress of about 50% of the hard shot.
By hammering, honing introduces a compressive stress, which is currently the best method for forming contact fatigue in the tooth. Surface finishing of the pits formed by shot peening allows the contact load to be dispersed through the large surface, thereby reducing the contact stress.
<br> <br> link rod by receiving the complex alternating load, must be subjected to a surface peening. The most critical fatigue area on the connecting rod is the aperture on both sides of the "work" beam connecting the large holes. Rough surfaces under compressive stress have better fatigue properties than smooth surfaces under tensile stress, so most of the strengthened surfaces do not require any pre-treatment or post-enhancement treatment.
<br> <br> working crankshaft of the crank at alternating stress, which change in cross section the adapter journal fillet stress fatigue and the risk of the occurrence of the edge should be great fatigue damage. In most cases, all apertures on the crankshaft require shot peening. The crankshaft fillet is the area where the stress is most concentrated. When the engine is ignited, the maximum stress is generated on the bottom side of the fillet. Fatigue cracks are created at the fillet and then extend to the crankshaft body, causing more severe failure.
Practice has proved that shot peening is very effective for improving the fatigue life of cast steel, forged steel, ductile iron, and austempered steel crankshafts.
<br> <br> torsion bar independent suspension torsion bar springs (torsion bar for short) is a key part of the suspension. The torsion bar acts as a balanced left and right to maintain stability during exercise. When used in systems that require repeated loads, such as automotive suspensions, shot peening can increase torsional fatigue limits and reliability.
Constant flow <br> <br> spray pill / shot blasting process to strengthen one of the most important aspects is the control of pellets or medium flow. To this end, Wheelabrator (Group)'s intensive equipment is equipped with a special dosing valve or mechanical system to monitor the flow of the pill. Data for media flow and other enhanced parameters can be downloaded for quality management or process control statistics (SPC).
Wear-resistant <br> <br> all Wheelabrator (Group) of shot blast equipment has a robust structure to ensure service life and minimal wear and tear over time. Consumables that are subject to long-term friction, such as rubber bushings, nozzles and head clamps, are easily replaced.
Low noise and low dust emission <br> <br> order to minimize noise levels, Wheelabrator (Group) use special insulation materials, noise wall or screen out aisle baffled. The level of dust emission from the equipment meets the latest EU standards.
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