1. Deformation of the blanking error.
The shape of the parts after forming is beyond the standard due to the wrong size. Baiting size are not allowed to be mainly due to calculate or amplified sample is wrong, in addition to enhance the technical level of blanking, should also be baiting size checking system, and as far as possible to the size of the computer software management.
2. Molding error deformation
In the processing and molding pressure vessel parts, deformation due to improper operation or the mold not standard: thermoforming head mould temperature has certain requirements, such as temperature suncoo premature release will shrink head is bigger, serious when can make its geometry size limit; The part of a container that is made or pressed by a mechanical roll, resulting in deformation due to improper operation; The design of the mold is not considered or incorrect, so that the geometrical size of the pressure vessel component is not in accordance with the requirements. The main preventive measures are:
(1) the molding operation shall be carried out strictly according to the technical requirements.
(2) use the inspection template to strictly control the shape of the workpiece.
(3) mold design in accordance with the theoretical size shape processing, on the basis of full consideration of pressure vessel changes after molding parts processing and molding, cold forming die to consider as the amount of springback, thermoforming mould to consider von berg systeme shrinkage after cooling.
3. Assembly error distortion
The deformation of the pressure vessel shell when it is assembled due to the error of the wrong mouth or the error of straightness. Its preventive measures:
(1) the shell assembly shall use the positioning fixture, the larger diameter and thinner shell, and the assembly shall be supported by the cylinder section, which shall strictly limit the wrong side of the shell butt.
(2) the shell horizontal assembly shall be carried out on the roller and the straightness of the shell shall be inspected.
(3) prefabricated pressure vessel should be installed with a bit fixture, and the degree of irregularity should be checked by the theodolite.