Patent ID: 7809465

Claim:
A soldering device, comprising: a position calculation unit which calculates a position of a heated object according to operational information of a conveyer which sequentially transfers the heated object into a plurality of zones for heat processing communicated with each other; a heat quantity calculation unit that calculates a temperature difference A between temperature set values when a temperature set value of an upper part of an object zone into which the heater objected is carried is equal to or larger than a temperature set value of an upper part of a previous zone located in a previous stage of the object zone, calculates a temperature difference A′ between the temperature set values when the temperature set value of the upper part of the object zone is equal to or larger than the temperature set value of a lower part in a furnace of the previous zone, calculates a coefficient serving as a threshold for adjusting a heat quantity in the object zone based on a relation between an absolute value of the temperature difference A′ and a reference temperature, and calculates a heat quantity of the heated object based on a product of the temperature difference A, the coefficient, and a width ratio defined by a width of the heated object relative to the object zone; and a temperature management unit which controls a temperature in an object zone, into which the heated object is carried, by adding the heat quantity of the heat object calculated by the heat quantity calculation unit to the heat quantity of the object zone calculated corresponding to a width of the object zone.