7 results about "Maximum diameter" patented technology

The invention belongs to the field of circuit board processing equipment, and particularly relates to a diameter sorting device and sorting equipment. The diameter sorting device comprises a feeding structure and a vibration structure. The feeding structure comprises adjusting assemblies, each adjusting assembly comprises two adjusting plates which are arranged in a relatively-inclined mode, and the two adjusting plates jointly form a feeding groove. The groove width of the feeding groove is gradually reduced from top to bottom, material filtering openings are formed in the groove bottom of the feeding groove, and the material filtering openings allow targeted objects with the maximum diameter being smaller than the widths of the material filtering openings to pass through. The vibration structure is used for driving the adjusting plates to vibrate, so that all the targeted objects vibrate along with the adjusting plates. The multiple adjusting assemblies are sequentially arranged at intervals in the vertical direction, the widths of the material filtering openings are sequentially reduced from top to bottom, and any adjusting assembly receives the targeted objects from the adjacent material filtering opening located above the adjusting assembly. The diameter sorting device is simple in structure, and the targeted objects with different diameters can be sorted.

The invention discloses a production method of a large-wall-thickness straight-seam submerged-arc-welded pipeline steel plate, comprising the steps of smelting and continuous casting, heating, rolling, cooling, and straightening; in the step of smelting and continuous casting, a casting blank from the continuous casting comprises, by weight, 0.03-0.07% of C, </=0.10% of Si, 1.5-1.7% of Mn, </=0.015% of P, </=0.002% of S, 0.015-0.045% of Als, 0.20-0.30% of Cr, 0.055-0.070% of Nb, 0.010-0.030% of Ti, and the balance of Fe and unavoidable impurities. A large-wall-thickness pipeline steel base product produced via the method has uniform mechanical properties at 0/4, 2/4 and 4/4 along its thickness in directions perpendicular to and parallel to the rolling direction, with small differences in metallographic structure type and grain size; after production, a difference between maximum diameter and minium diameter of end ports of a steel pipe is 0.1-1.2 mm, end roundness deviations of the steel pipe range from 0.5 mm to 4.5 mm, and roundness index is increased by 55-70%. The large-wall-thickness straight-seam submerged-arc-welded pipeline steel plate produced via the method has the advantages such as high uniformity of mechanical properties, and small roundness deviation and high index after subsequent pipe forming.

The invention relates to a forming tool for machining an inverted-trapezoid sealing ring groove of a ceramic component and a machining method of the forming tool. The tool comprises a tool bit and a tool handle. The tool bit is in an inverted trapezoid shape. The maximum diameter phi d of the tool bit is smaller than the minimum groove opening width phi c of the inverted-trapezoid sealing ring groove to be machined, the long edge side circular bead Rd of the tool bit corresponds to the circular bead Rc of the inverted-trapezoid sealing ring groove to be machined, and the length Hd of the tool bit corresponds to the depth Hc of the inverted-trapezoid sealing ring groove to be machined. The method comprises the steps that the cylindrical diamond tool with the phi c-0.1 is selected and installed on a machine tool spindle; a blank is fixed to a machine tool workbench; a machine tool is started, and the tool is fed for layer cutting by depth Hc-0.05 in the Z direction; the tool is specially designed to conform to the formula: phi d=phi c-0.1, feeding is carried out in the Z direction, and lateral cutting is carried out by depth Hc+0.05; and a tool compensation program runs. The needed inverted-trapezoid sealing ring groove can be conveniently and rapidly machined, the groove type is accurate, and the size is stable.

An appendage 8 for reducing hub vortex is disposed, via a support body 7 extending from a hull 2, at the rear of a propeller (wing propeller) 4 which has no rudder disposed to the rearward thereof. The appendage 8 has a circular cross-section in a direction orthogonal to a center axis extending in the hull direction, and a rear section thereof is formed in a spindle shape, the diameter of which decreases toward the rear end thereof. The appendage 8 is configured to have a maximum diameter that is equal to 10-40% of the diameter of the propeller (wing propeller) 4, and a hull-direction length that is equal to 40-70% of the diameter of the propeller (wing propeller) 4.