Harbin Institute of Technology

Xiaolei Cui

Shijian Yuan

Cong Han

A method for measuring an r-value of a tube in a circumferential direction: determine a size of an annular sample, and cutting the sample from a to-be-measured tube; making speckles or circular grids on an outer surface of the sample; sleeving the annular sample in a middle of an outside of a ring segmented rigid die; filling a liquid bag with a fluid medium and controlling an internal pressure, and driving the ring segmented rigid die to move outward uniformly in a radial direction using a uniformly distributed load generated by pressurizing the liquid bag, so as to cause equal diameter bulging of the annular sample; measuring strain in width and circumferential directions in a speckle or circular grid region on the annular sample; and determining the plastic strain ratio of the tube in the circumferential direction according to the strain in the width and circumferential directions.

Method and device for measuring r-value of tube in circumferential direction

The present disclosure discloses an ultra-low pressure liquid filling forming system for a special-shaped component, including a control system, a supercharger, a driving device, a preforming unit, and a final forming unit. The present disclosure further provides an ultra-low pressure liquid filling forming method for a special-shaped component, including the following steps: Smaking an equal diameter cylindrical coil blank with an overlapping part in a longitudinal direction by using a plate blank; Sbulging the equal diameter cylindrical coil blank into a variable diameter cylindrical prefabricated coil blank; Scutting and welding the overlapping part remaining on the variable diameter cylindrical prefabricated coil blank in the axial direction to obtain a variable diameter prefabricated tube blank; Sfilling liquid and press-forming the variable diameter prefabricated tube blank, so that the variable diameter prefabricated tube blank occurs compressive deformation, thereby forming the special-shaped component.

Ultra-low pressure liquid filling forming system and method for special-shaped component

The present invention discloses a method and system for controlling axial length of an ellipsoidal shell based on liquid volume loading. The method includes: determining the volume calculation models of an unformed prefabricated shell and a formed ellipsoidal shell; determining a calculation model of a volume difference between the unformed prefabricated shell and the formed ellipsoidal shell; determining a structure size of the unformed prefabricated shell according to a target axial length of the formed ellipsoidal shell; obtaining the volume difference between the formed ellipsoidal shell and the unformed prefabricated shell, and recording the volume difference as a target volume; injecting liquid into the unformed prefabricated shell with target volume to obtain the formed ellipsoidal shell. The forming process in the present invention is simple and easy to implement without considering differences in materials and wall thicknesses and can control and adjust the axial length dimension accuracy of a shell.

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Harbin, China

Xiaolei Cui