Method for manufacturing an electrical heating device

A method for manufacturing an electrical heating device comprising the following steps:

• providing a coil form with a longitudinal axis, wherein the coil form is shaped so that cross-sectional surfaces of the coil form, to which the longitudinal axis is perpendicular, have a main axis, which corresponds to a greatest diameter of the cross-sectional surfaces, and a secondary axis, which corresponds to a smallest diameter of the cross-sectional surfaces, and wherein the coil form has an opening extending parallel to the longitudinal axis;
• inserting a coiled section of an electrical heating element into the opening passing through the coil form parallel to the longitudinal axis;
• inserting the coil form, with the coiled section of the electrical heating element inserted into the opening passing through the coil form parallel to the longitudinal axis, into an interior of a tubular metal jacket;
• filling the tubular metal jacket with an electrically insulating, heat-conductive powder or granulate;
• compacting the tubular metal jacket with the coil form inserted therein and filled with the electrically insulating, heat-conductive powder or granulate, wherein, by the compacting of the tubular metal jacket, which takes place in multiple steps, the coil form is deformed so that a change of a ratio between one of a length of the main axis and a length of the secondary axis or a change of a position of the main axis and the secondary axis relative to each other is produced;
• and
• a press contact is produced between the connecting wire and sections of the electrical heating element inserted into the opening passing through the coil form parallel to the longitudinal axis.

A method for manufacturing an electrical heating device comprising the following steps:

• providing a coil form with a longitudinal axis, wherein the coil form is shaped so that cross-sectional surfaces of the coil form, to which the longitudinal axis is perpendicular, have a main axis, which corresponds to a greatest diameter of the cross-sectional surfaces, and a secondary axis, which corresponds to a smallest diameter of the cross-sectional surfaces, and wherein the coil form has an opening extending parallel to the longitudinal axis;
• winding at least one section of an electrical heating element on the coil form along the longitudinal axis and inserting an end section of the electrical heating element and a connecting wire into the opening passing through the coil form parallel to the longitudinal axis;
• inserting the coil form, with the electrical heating element wound on the coil form in some sections, into an interior of a tubular metal jacket;
• filling the tubular metal jacket with an electrically insulating, heat-conductive powder or granulate;
• compacting the tubular metal jacket with the coil form inserted therein and filled with the electrically insulating, heat-conductive powder or granulate, wherein, by the compacting of the tubular metal jacket, which takes place in multiple steps, the coil form is deformed so that a change of a ratio between one of a length of the main axis and a length of the secondary axis or a change of a position of the main axis and the secondary axis relative to each other is produced;
• and
• an inner wall surface of the opening passing through the coil form parallel to the longitudinal axis is brought into contact with the coiled section of the electrical heating element inserted into the opening passing through the coil form parallel to the longitudinal axis.

A method for manufacturing an electrical heating device comprising the following steps:

• providing a coil form with a longitudinal axis, wherein the coil form is shaped so that cross-sectional surfaces of the coil form, to which the longitudinal axis is perpendicular, have a main axis, which corresponds to a greatest diameter of the cross-sectional surfaces, and a secondary axis, which corresponds to a smallest diameter of the cross-sectional surfaces, and wherein the coil form has an opening extending parallel to the longitudinal axis;
• inserting a coiled section of an electrical heating element into the opening passing through the coil form parallel to the longitudinal axis;
• inserting the coil form, with the coiled section of the electrical heating element inserted into the opening passing through the coil form parallel to the longitudinal axis, into an interior of a tubular metal jacket;
• filling the tubular metal jacket with an electrically insulating, heat-conductive powder or granulate;
• compacting the tubular metal jacket with the coil form inserted therein and filled with the electrically insulating, heat-conductive powder or granulate, wherein, by the compacting of the tubular metal jacket, which takes place in multiple steps, the coil form is deformed so that a change of a ratio between one of a length of the main axis and a length of the secondary axis or a change of a position of the main axis and the secondary axis relative to each other is produced;
• and
• an inner wall surface of the opening passing through the coil form parallel to the longitudinal axis is brought into contact with the coiled section of the electrical heating element inserted into the opening passing through the coil form parallel to the longitudinal axis.