When a piece of metal receives a shot from a steel pill, it bends. Saturated state and shot peening are two important concepts in shot peening.
When a piece of metal receives a shot from a steel pill, it bends. Saturated state and shot peening are two important concepts in shot peening. The saturated state refers to a state in which the spraying is continued under the same conditions without changing the mechanical characteristics of the sprayed region. The so-called shot peening strength is to measure the strength of the metal sheet (ie, the test piece) which is pre-formed into a certain specification to a saturated state at a specified time, and measure the slamming of the spurt with the arc height of the test piece bending. The degree of weakness.
At present, the most widely used American Automobile Engineering Society shot peening standard adopts the shot peening test method proposed by Arman, the arc height method, which is proposed by JO Almen (Almen) of American GM Company, and is SAEJ442a and The measurement method specified by the SAE443 standard is to reflect the shot peening effect by detecting the shape change after shot peening using a spring steel test piece of a certain specification. When the thin-plate test piece is subjected to single-side shot peening, since the surface layer is subjected to stretching deformation under the action of the projectile, the thin plate is spherically curved toward the shot blasting surface. The arc height value of the spherical surface is usually measured over a certain span distance and used to measure the strength of the shot. The arc height value is determined by fixing the Almen test piece on a special jig, after the shot peening, then taking off the test piece, and then measuring the participation deformation type produced by the single-sided shot peening of the test piece with an Almen gauge. (ie the arc height value). When the arc height measured by the test piece is 0.35 mm, it is recorded as 0.35 A.
Another test method for shot peening strength is residual stress detection, that is, the residual stress is detected on the workpiece after strong shot peening. The specific test method is X-ray diffraction. The following method is recommended in the US SAE J784a standard: the incident and diffracted beams of X-rays must be parallel to the root of the gear, the measurement position on the cylindrical spur gear and the cylindrical helical gear should be at the center of the width of the root, and the illumination area must be concentrated on the tooth. The center of the fillet of the root cannot be laterally extended beyond the specified point of measurement of the depth of the root surface of the root. The control of the size of the illuminated area can be achieved by direct beam and proper covering of the root surface; on each selected gear to be inspected At least two teeth should be selected for evaluation. The two teeth are separated by 180?. If the effective tooth profile of the tooth is protected from grinding, the gear for the subsurface residual stress measurement of the root grinding can be considered to be uncorrupted and can be used for production.
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This information was released by Xiangyu Machine Tool on August 10, 2013.
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