The present invention discloses a forming device for a large thin-walled part with a curved surface, which includes a punch, a blank holder, a die, a lower die plate, a first annular sleeve and second annular sleeves. The first annular sleeve is connected with first driving oil cylinders. An inner diameter of the die is greater than an outer diameter of the punch. The first annular sleeve is arranged in a gap between the punch and the die. The second annular sleeve is arranged at the bottom of the punch. The first annular sleeve is arranged outside the second annular sleeve. The second annular sleeve is connected with second driving oil cylinders. The first driving oil cylinders and the second driving oil cylinders are connected with a hydraulic system.

The invention relates to an automated punching station for the production of punched components for prosthetic surgery instruments, in particular for instruments able to mill/cut or otherwise carry out tissue removal processes in preparation for, or in the context of, prosthetic surgery operations. The invention also concerns a method to produce said punched components, and a punched component thus obtained.

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.

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.

The present invention discloses a forming device for a large thin-walled part with a curved surface, which includes a punch, a blank holder, a die, a lower die plate, a first annular sleeve and second annular sleeves. The first annular sleeve is connected with first driving oil cylinders. An inner diameter of the die is greater than an outer diameter of the punch. The first annular sleeve is arranged in a gap between the punch and the die. The second annular sleeve is arranged at the bottom of the punch. The first annular sleeve is arranged outside the second annular sleeve. The second annular sleeve is connected with second driving oil cylinders. The first driving oil cylinders and the second driving oil cylinders are connected with a hydraulic system.

Provided is a novel metallic coarse aggregate for concrete which can be used as a coarse aggregate which is one of the essential constituents of concrete, can further improve the compressive strength and tensile strength of concrete, is less likely to be sedimented in fresh concrete, and has good productivity at a low cost. The metallic coarse aggregate for concrete includes a coarse aggregate body including a spherical cap portion bonded body having two hollow spherical cap portions and an annular portion protruding from a surface of the spherical cap portion bonded body so as to surround an outer periphery of the spherical cap portion bonded body, the annular portion having a shape in which a corner of a rectangular shape is bent upward or downward.

The present invention discloses a gas pressure forming method of an ellipsoid. The formability of a closed polyhedral shell including polar plates, ellipsoidal side flap plates, and welded joints is improved, and the closed polyhedral shell is pressurized into an ellipsoid by using compressed gas under a heating condition, specifically comprising: assembling and welding two polar plates and ellipsoidal side flap plates into a closed polyhedral shell; disposing an electrode on the closed polyhedral shell, energizing and heating to a preset temperature, and then inflating compressed gas into the shell; deforming the closed polyhedral shell under the action of internal gas pressure, stopping inflating gas until a desired curvature shell is obtained, discharging gas, and removing the electrode to obtain a formed ellipsoid.

A roll-on applicator ball and a method of forming the roll-on applicator ball, the roll-on applicator ball comprising a first half ball part and a second half ball part. A generally annular connecting ring connects the ball halves together.

A roll-on applicator ball and a method of forming the roll-on applicator ball, the roll-on applicator ball comprising a first half ball part and a second half ball part. A generally annular connecting ring connects the ball halves together.

A roll-on applicator ball is provided and comprises a first half ball part and a second half ball part. A generally annular connecting ring connects the ball halves together. A method of forming a roll-on applicator ball is also provided.