A shot processing apparatus according to an aspect includes: a projector; a set table configured to support the workpiece from below and be rotatable about an axis; a retaining mechanism including a retainer opposed to the set table with the workpiece interposed, the retainer being configured to be rotatable about the axis and movable in a direction of the axis; a rotational force driver configured to apply rotational force to the retainer through a transmission mechanism; and a lifting mechanism including a pressing holder capable of being lifted and lowered above the retaining mechanism, the lifting mechanism being at a distance from the retaining mechanism when the pressing holder is located above a reference height, the lifting mechanism applying pressing force to the workpiece through the retainer when the pressing holder is located below the reference height.

A shot processing apparatus according to an aspect includes: a projector; a set table configured to support the workpiece from below and be rotatable about an axis; a retaining mechanism including a retainer opposed to the set table with the workpiece interposed, the retainer being configured to be rotatable about the axis and movable in a direction of the axis; a rotational force driver configured to apply rotational force to the retainer through a transmission mechanism; and a lifting mechanism including a pressing holder capable of being lifted and lowered above the retaining mechanism, the lifting mechanism being at a distance from the retaining mechanism when the pressing holder is located above a reference height, the lifting mechanism applying pressing force to the workpiece through the retainer when the pressing holder is located below the reference height.

A shot-processing device is provided, and by it they are effectively reused and prevented from being taken out of a cabinet and from scattering. A structure (40) for a flow path that connects the inside of the cabinet (12) and a suction port (70A) of a dust collector (70) includes a part of a route for circulation of a circulating machine (32) and a second flow path (40Y) that connects a chamber for blowing air and the suction port (70A). In the structure for the flow path a classifying part (35) is provided. It includes a first cyclone (36) that classifies particulate objects that include shots as shots that have a diameter that makes them reusable and as the other particulate objects and includes a part of the first flow path (40X), and a second cyclone (44) that includes a part of the second flow path.

A coil spring includes a helically formed wire having end turn portions at ends thereof, a plurality of first rough surfaces, each including first shot peening indentations formed on a part of a surface of the end turn portions, and a second rough surface including second shot peening indentations formed on the entire surface of the wire except for the first rough surface. The second rough surface has a surface roughness different from that of the first rough surface.

A coil spring includes a helically formed wire having end turn portions at ends thereof, a plurality of first rough surfaces, each including first shot peening indentations formed on a part of a surface of the end turn portions, and a second rough surface including second shot peening indentations formed on the entire surface of the wire except for the first rough surface. The second rough surface has a surface roughness different from that of the first rough surface.

A vertical motion impeller-type shot peening device performs a second shot peening to a coil spring including first shot peening indentations. The vertical motion impeller-type shot peening device includes a workpiece holding mechanism including a lower end turn support and an upper end turn support, a stress applying mechanism which compresses the coil spring, a rotation mechanism, and a projection mechanism which includes a pair of vertically movable impeller units. A first rough surface including first shot peening indentations is formed on a part of end turn portions of the coil spring. A second rough surface including second shot peening indentations is formed on the entire surface of wire except for the first rough surface.

A vertical motion impeller-type shot peening device performs a second shot peening to a coil spring including first shot peening indentations. The vertical motion impeller-type shot peening device includes a workpiece holding mechanism including a lower end turn support and an upper end turn support, a stress applying mechanism which compresses the coil spring, a rotation mechanism, and a projection mechanism which includes a pair of vertically movable impeller units. A first rough surface including first shot peening indentations is formed on a part of end turn portions of the coil spring. A second rough surface including second shot peening indentations is formed on the entire surface of wire except for the first rough surface.

An impeller for a centrifugal blast wheel machine includes a hub provided at one end of the impeller, with the hub being configured to be coupled to the motor. The impeller further includes a tapered section provided at an opposite end of the hub, with the tapered section defining a media inlet to receive blast media. The impeller further includes a plurality of drop-shaped vanes positioned between the hub and the tapered section. The plurality of drop-shaped vanes is spaced from one another on peripheries of the hub and the tapered section. The plurality of drop-shaped vanes defines a plurality of impeller media outlets constructed and arranged to allow egress of blast media upon rotation of the impeller. Each vane is drop-shaped having a leading side directed toward a direction of rotation of the impeller and a trailing side opposite the leading side.

A hanging section is installed at an upper side of a cabinet, and an autorotation mechanism rotates the hanging section around an axis of the hanging section in upward/downward directions of a device. In addition, a hanger unit hanging from the hanging section is installed in a cabinet, and a pair of frame sections is parallelly installed in series to match opening directions. Then, projection machines project a shot media toward the hanger unit. In addition, a loading/unloading device installed outside the cabinet is configured such that arm constituting a part thereof can be inserted into an opening section of the frame section of the hanger unit, and a tray on which a workpiece is placed can be conveyed. The loading/unloading device loads/unloads the tray with respect to the hanger unit by advancing and retracting the arm.

A coil spring processing device includes an end positioning device, shot peening device, and controller. The end positioning device positions ends of a coil spring. The shot peening device includes a turntable mechanism, pressure mechanism, rotation mechanism which rotates the coil spring, and projection mechanism which projects shots. Holding mechanisms each include a lower shifting prevention jig and an upper shifting prevention jig. The controller stops a first holding mechanism and a second holding mechanism in rotation stop positions corresponding to end turn portions of the coil spring.