Heavy rail abdominal cavity parameterization tolerance judging method

The invention discloses a heavy rail abdominal cavity parameterization tolerance judging method and relates to the field of steel rolling. The heavy rail abdominal cavity parameterization tolerance judging method solves the problem that an existing judging method cannot be used for accurately judging heavy rail scanning fracture surface outline abdominal cavity parameters. The heavy rail abdominal cavity parameterization tolerance judging method comprises the steps that datum points are determined, scanning points on a lower jaw oblique line of a heavy rail scanning fracture surface outline rail head and scanning points on an upper oblique line of a rail leg are rotated and corrected, a linear equation of the lower jaw oblique line of a heavy rail standard fracture surface outline rail head is established, the corresponding scanning points are substituted into the linear equation to be calculated, a standard linear equation of the upper oblique line of a heavy rail standard fracture surface outline rail leg is established, the corresponding scanning points are substituted into the standard linear equation to be calculated, and lastly heavy rail scanning fracture surface outline abdominal cavity parameterization tolerance judging is carried out through comprehensive comparison. According to the method, errors are small, the judging result is close to a sample plate measuring result, and an effective basis is provided for rolling adjusting and lower steel rail line judging; moreover, the method can be achieved through a computer program, so the automation degree of heavy rail detecting can be improved, the manual measuring proportion is lowered, and the rhythm of production is improved.