Abstract: A mold with cavities for nanoimprint lithography and a method of imprinting the same. The mold is a one-piece structure, including an upper mold and a lower mold which are welded together. The upper mold is evenly provided with a plurality of stepped holes. A plurality of grooves are provided at an upper surface of the lower mold. Both ends of each groove are respectively connected to an external high-pressure water pump and an external vacuum pump via pipelines. An airtight cavity is additionally provided at the interior of the mold to form a negative pressure in the cavity by vacuumizing during the imprint process. In the demolding, a crack is formed at the interface between the mold and the imprint resist by using water pressure and expands to the entire interface for the demolding of the imprinted structure.

Abstract: A mold with cavities for nanoimprint lithography and a method of imprinting the same. The mold is a one-piece structure, including an upper mold and a lower mold which are welded together. The upper mold is evenly provided with a plurality of stepped holes. A plurality of grooves are provided at an upper surface of the lower mold. Both ends of each groove are respectively connected to an external high-pressure water pump and an external vacuum pump via pipelines. An airtight cavity is additionally provided at the interior of the mold to form a negative pressure in the cavity by vacuumizing during the imprint process. In the demolding, a crack is formed at the interface between the mold and the imprint resist by using water pressure and expands to the entire interface for the demolding of the imprinted structure.

Abstract: Forming methods of one-piece weldless wheels made of metal sheets including the steps of rolling, forming a primary wheel rim and a primary wheel disc, roll forming, compressing and shaping, in order to obtain one-piece weldless wheels. The methods can form weldless wheels by rolling, cold roll forming and cold extruding, which can reduce energy consumption by 45-55% and cut down material cost by 5-15% while improving strength of the wheel by 20-30%. A wheel with different thicknesses can be formed by the methods and can meet the requirements on mechanical strength. The methods can improve the precision of the wheel and minimize the swing value and jerk value. The wheel produced is safer, and the regular air tight test on the wheel is not necessary.

Abstract: The invention provides a rolling forming method of wheel disc, which comprises the following steps: (1) Baiting a circular blank; (2) placing the circular blank in a cavity of a rolling explorator and adopting at least two rolling wheels symmetrically arranged along the circumferential direction of the rolling explorator to perform planar synchronous staggered rolling on the circular blank in the cavity of the rolling explorator; (3) performing trimming and sizing; and (4) stretch forming. The rolling forming method of wheel disc of this invention can precisely form various geometric sections with gradual deformation. The formed product has a uniform mass in the axial direction and the circumferential direction, and has a high dynamic balance precision. The invention can make the blank deform precisely, enhance the production efficiency, and reduce the cost, therefore the invention has good application and popularization prospect.

Abstract: The invention provides a rolling forming method of wheel disc, which comprises the following steps: (1) Baiting a circular blank; (2) placing the circular blank in a cavity of a rolling explorator and adopting at least two rolling wheels symmetrically arranged along the circumferential direction of the rolling explorator to perform planar synchronous staggered rolling on the circular blank in the cavity of the rolling explorator; (3) performing trimming and sizing; and (4) stretch forming. The rolling forming method of wheel disc of this invention can precisely form various geometric sections with gradual deformation. The formed product has a uniform mass in the axial direction and the circumferential direction, and has a high dynamic balance precision. The invention can make the blank deform precisely, enhance the production efficiency, and reduce the cost, therefore the invention has good application and popularization prospect.