Shot peening tools and related methods
a technology of peening tools and metal substrates, applied in the field of peening tools, can solve problems such as compressive residual stresses, and achieve the effects of increasing compressive stresses in metal substrates
Active Publication Date: 2017-12-07
SUPERIOR SHOT PEENING
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Benefits of technology
The patent relates to a method for surface-treating metal substrates in fluid ends with compressive residual stresses for strengthening against strain. The method involves cold-working the surface with accelerated shot directed toward a lip or a surface of the metal substrate at an angle between about -70 degrees and about -85 degrees relative to the longitudinal bore. The resulting increased compressive stresses can enhance the fluid end's ability to withstand strain. The patent also describes a tool and a method for cold-working metal substrates within a longitudinal bore having a diameter less than about 36 inches. The method involves directing accelerated shot towards the surface at an angle between about -70 degrees and about -85 degrees for increasing compressive stresses and decreasing the peak-to-valley profile of the surface.
Problems solved by technology
Mechanical surface treatments cold-work the surface material, causing compressive residual stresses and, depending on the properties of the materials, often strengthening the surface against strain.
Method used
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[0011]Shot peening tools and related methods for shot peening any type of metal substrate are disclosed. Shot peening is used to finish metal parts that require increased wear and fatigue resistance. In the process, shot bombards the surface of the metal substrate, creating small dimples in the surface. The number of dimples may be referred to as “coverage”, a measurement that defines the number of impacts as a percentage of the surface having dimples from shot impact. For example, one hundred percent (100%) coverage means that one hundred percent (100%) of every square inch of surface has been impacted leaving a dimple. Shot may have many different diameters or average diameters, and may be spherical or non-spherical, that is, diameter is not limited to meaning spherical shot. The dimples cause compressive stresses in the surface and sub-surface of the substrate, increasing the metal substrate's resistance to cracks, fatigue, and corrosion. Shot peening may be used for a wide varie...
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Abstract
A tool for cold-working a metal substrate of a longitudinal bore having a diameter less than about eight inches includes a deflector tip configured to direct accelerated shot having diameters on average not larger than 100 mils (2.54 mm) toward a surface of the metal substrate at an angle between about 70 degrees and about 85 degrees relative to the surface, thereby providing increased compressive stresses in the metal substrate.
Description
FIELD[0001]Embodiments disclosed herein relate to shot peening tools and related methods of shot peening metal surfaces. Embodiments disclosed herein further relate to methods of achieving greater compressive stresses at greater depths beneath surfaces of metal substrates, or greater shot peened coverage over a metal surface, or both.BACKGROUND AND SUMMARY[0002]Mechanical surface treatments cold-work the surface material, causing compressive residual stresses and, depending on the properties of the materials, often strengthening the surface against strain. One of the most common and versatile of the cold-working treatments is “shot peening.” In shot peening, the surface is bombarded with high-velocity shot, round metallic, glass or ceramic beads, discharged from a pneumatic nozzle. The resulting lightly hammered or “peened” effect places the surface in residual, preferably uniform, compression.[0003]In one aspect, embodiments disclosed herein relate to a method of treating a surface...
Claims
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IPC IPC(8): B24C1/10C22F1/00C21D7/06
CPCB24C1/10C22F1/00C21D7/06B24C3/325
Inventor SPINNER, DANIELBLASINGAME, VANJOHNSON, ALBERT
Owner SUPERIOR SHOT PEENING