Abstract: An arbor clamping apparatus providing a steady way for clamping boring arbor and improves structure rigidity and boring accuracy for boring and milling machines. The milling arbor of the present invention is designed and characterized by two steps spindles and includes the first step spindle used mainly to clamp a boring arbor and to hold large cutting tools and fixtures, and the second step spindle designed principally to support and contain the boring arbor. With the first step spindle a clamping mechanism is established and includes a hydraulic cylinder, a piston and movable wedges. Hydraulic force is applied through the action of the piston to drive the wedges to move between the boring and milling arbors and hence the clamping for a boring arbor is achieved through the approaching action of the wedges.

Abstract: A method of fabricating a pump casing that includes an inlet, an outlet and a pump casing body. The pump casing body has a neck portion that defines a groove. The inlet is formed by stamping a sheet of metal to form a basin-shaped body, wherein the stamping the center portion of the basin-shaped body forms the inlet. Centering the basin-shaped body about a first axis and using one set of roller dies to roll form the basin-shaped body into a pump casing body. The pump casing body includes, starting from the inlet, an inlet end plate, a passage side plate, a motor end plate and a neck portion. Stamping the passage side plate forms the outlet. A set of roller dies include an internal roller die and a mating external roller die, wherein both are rotatably mounted along a second and third axes, respectively, wherein the first, second and third axes are parallel to but spaced from each other.

Abstract: A pump casing made of sheet metal for centrifugal pump includes a body, an impeller, an inlet double flange and an outlet double flange. The body has an inlet to engage with the inlet double flange, and an outlet to engage with the outlet double flange. Adjacent the circumference of the inlet double flange, there is a first flap flange fixed at one end thereon and extending along the outside wall of the body and being fixed and located remote from the inlet. Adjacent the circumference of the outlet double flange, there is a second flap flange fixed at one end thereon and extending along the outside wall of the body and connecting with the body and the inlet double flange. Both the first and second flap flanges can disperse the forces and stresses away from the inlet and outlet so that the pump casing can withstand greater forces and stresses which are typically caused by the internal forces of the piping system.