Adjustable ratio control system and method
AssigneeSeco/Warwick S.A.
InventorRobert C. Larko
Life of this patent
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Abstract
Systems and methods for performing adjustable ratio control for a furnace with a plurality of workpieces located within a furnace and a sensor for determining the temperature of each of the workpieces. Adjustable ratio control is performed by controlling the temperature of an atmosphere of the furnace wherein a first workpiece with a lower temperature is heated at a higher rate than a second workpiece with a higher temperature.
Claims13
An adjustable ratio control system for a furnace with a plurality of workpieces located within the furnace, comprising
- a sensor that determines the temperature of each of the workpieces;
- and
- a controller that controls the temperature of an atmosphere of the furnace, wherein a first workpiece with a lower work temperature is heated at a higher rate than a second workpiece with a higher work temperature and the first workpiece and surrounding atmosphere is in a first zone and the second workpiece and surrounding atmosphere is in a second zone where the temperature of a zone is determined by the following formula AIR SP = Δ t ( Δ t Δ t max ) R + WSP
- where:
- AIR SP is equal to the temperature to be established within a zone;
- Δt is equal to the temperature difference between an annealing temperature and a current work temperature of the workpiece;
- Δtmax is equal to the maximum temperature difference between an annealing temperature and a current work temperature among the plurality of the workpieces;
- R is equal to a preset ratio and
- WSP is equal the annealing temperature.
The system claim 4, wherein ( Δ t Δ t max )
- is adjusted by a power such that temperature control within a hotter zone occurs at a faster rate.
An adjustable ratio control system for a furnace with a plurality of workpieces located within the furnace, comprising
- a sensor that determines the temperature of each of the workpieces;
- and
- a controller that controls the temperature of an atmosphere of the furnace, wherein a first workpiece with a lower work temperature is heated at a higher rate than a second workpiece with a higher work temperature and the first workpiece and surrounding atmosphere is in a first zone and the second workpiece and surrounding atmosphere is in a second zone where the temperature of a zone is determined by the following formula AIR SP = ( Δ t ) ( A B ) R + WSP
- where:
- AIR SP is equal to the temperature to be established within a zone;
- Δt is equal to the temperature difference between an annealing temperature and a current temperature of the work piece;
- A is any selected number;
- B is the difference between the temperature of the workpiece and a temperature of the coldest workpiece;
- and
- R is equal to a preset ratio.
Dependencies are inferred from the claim text.