Method for producing a helical casting pattern

A method for producing a helical casting pattern, comprising:

• providing a strand-shaped pattern body having a centric longitudinal axis, a centric cavity extending in the direction of the centric longitudinal axis, and a pattern body wall that surrounds the centric cavity;
• providing a processing tool for creating a recess;
• arranging the strand-shaped pattern body and the processing tool such that the processing tool extends entirely through the pattern body wall in a radial direction with respect to the longitudinal axis;
• and
• driving, in a rotatory manner, at least one of the processing tool and the strand-shaped pattern body about one of the longitudinal axis of the strand-shaped pattern body and an axis parallel thereto, in order to create a relative rotational movement between the processing tool and the strand-shaped pattern body, and
• driving, in a translatory manner, at least one of the processing tool and the strand-shaped pattern body, along a direction parallel to the longitudinal axis, in order to create a relative translational movement between the strand-shaped pattern body and the processing tool in the direction parallel to the longitudinal axis,
• the relative translational movement being produced one of continuously or at least intermittently during or in alternation with the relative rotational movement, while the processing tool extends entirely through the pattern body wall, such that the processing tool at least one of displaces, removes, and erodes material of the strand-shaped pattern body, in accordance with the relative translational movement and the relative rotational movement, in order to create a through-recess in the pattern body wall,
• the relative rotational movement and the relative translational movement being controlled in such a way that the through-recess is created with a helical shape,
• wherein, while the through-recess is being created, the strand-shaped pattern body is mounted in a suspended manner, an upper region of the strand-shaped pattern body being held by a fastening device, the through-recess being introduced from the bottom to the top of the strand-shaped pattern body,
• wherein a receiving plate is provided beneath the processing tool, which receives a strand of the strand-shaped pattern body that is pulled downwardly due to gravity as the through-recess is being introduced, wherein the receiving plate moves along in a rotatory and/or translatory manner to prevent excessive deformation of the strand,
• wherein the receiving plate is arranged beneath the strand-shaped pattern body, wherein the receiving plate moves along with the strand-shaped pattern body in a rotatory and translatory manner.