Abstract: A water based adhesive removal composition which is effective and non-residual on magnesium and alloys comprises an alkali, a main solvent, a volatilization inhibitor, a cosolvent, a corrosion inhibitor, a penetrant, a thickening agent, a surface active agent, and water. The water based adhesive removal composition is water-based formula, the water-based formula is not easy to volatilize and is not flammable. When being used to remove adhesive attached on the magnesium alloy component, there is no risk of magnesium ignition.

Abstract: A method for verifying scan precision of a laser measurement machine includes the steps of: preparing a standardized 3D profile model; determining an ideal curved surface as a conventional true value of the standardized 3D profile model; scanning the standardized 3D profile model by the laser measurement machine and obtaining point cloud data; calculating a bias between each point in the point cloud and the ideal curved surface; evaluating the veracity of the laser measurement machine by using the largest bias; and evaluating the receptiveness of the laser measurement machine.

Abstract: A method for verifying scan precision of a laser measurement machine includes the steps of: preparing a standardized BGA model; measuring Z coordinates values of each solder ball peak of the BGA model for certain times; determining a Z coordinates conventional true value of each solder ball peak; measuring X, Y coordinates values of each solder ball centre of the BGA model; determining a coplanarity conventional true value of a seating-plane; determining an optimum scanning mode; determining optimum scanning parameters under the optimum scanning mode; scanning the BGA model under the optimum scanning parameters and the optimum scanning mode; obtaining X, Y, Z coordinates values of each solder ball peak; evaluating the veracity of Z coordinates of each solder ball peak; evaluating the veracity and repetitiveness of coplanarity; and evaluating scan precision of the laser measurement machine.

Abstract: A method for verifying scan precision of a laser measurement machine includes the steps of: preparing a transparent flat, of which the flatness of each plane is regarded as a flatness conventional true value; determining an optimum scanning mode; determining optimum scanning parameters under the optimum scanning mode; scanning the transparent flat under the optimum scanning mode and the optimum scanning parameters for certain times, and obtaining measuring data; calculating a plurality of flatness values using the measuring data; calculating an average value and a standard deviation of the flatness values, and a bias between the average value and the flatness conventional true value; evaluating the repetitiveness of the laser measurement machine according to the standard deviation; and evaluating the veracity of the laser measurement machine according to the bias.

Abstract: A method for verifying scan precision of a laser measurement machine includes the steps of: preparing a transparent flat, of which the flatness of each plane is regarded as a flatness conventional true value; determining an optimum scanning mode; determining optimum scanning parameters under the optimum scanning mode; scanning the transparent flat under the optimum scanning mode and the optimum scanning parameters for certain times, and obtaining measuring data; calculating a plurality of flatness values using the measuring data; calculating an average value and a standard deviation of the flatness values, and a bias between the average value and the flatness conventional true value; evaluating the repetitiveness of the laser measurement machine according to the standard deviation; and evaluating the veracity of the laser measurement machine according to the bias.

Abstract: A method for verifying scan precision of a laser measurement machine includes the steps of: preparing a standardized 3D profile model; determining an ideal curved surface as a conventional true value of the standardized 3D profile model; scanning the standardized 3D profile model by the laser measurement machine and obtaining point cloud data; calculating a bias between each point in the point cloud and the ideal curved surface; evaluating the veracity of the laser measurement machine by using the largest bias; and evaluating the receptiveness of the laser measurement machine.

Abstract: A method for verifying scan precision of a laser measurement machine includes the steps of: preparing a standardized BGA model; measuring Z coordinates values of each solder ball peak of the BGA model for certain times; determining a Z coordinates conventional true value of each solder ball peak; measuring X, Y coordinates values of each solder ball centre of the BGA model; determining a coplanarity conventional true value of a seating-plane; determining an optimum scanning mode; determining optimum scanning parameters under the optimum scanning mode; scanning the BGA model under the optimum scanning parameters and the optimum scanning mode; obtaining X, Y, Z coordinates values of each solder ball peak; evaluating the veracity of Z coordinates of each solder ball peak; evaluating the veracity and repetitiveness of coplanarity; and evaluating scan precision of the laser measurement machine.