Heat treatment apparatus

Abstract

A heat treatment device (10) of the invention comprises a furnace body (12), circulation fans (22), heaters (20), heat-resistant filters (14) and hot wind rectification plates (16). The hot wind rectification plates (16) are configured between the heat-resistant filters (14) and a workpiece (18). The hot wind rectification plates (16) cause the amount of the hot wind provided from one side of a first side surface above the workpice (18) to the workpice to be larger than that of the hot wind provided from one side of a second side surface to the workpiece. and on the other hand, causes the amount of the hot wind provided from one side of the second side surface below the same workpiece (18) to be larger than that of the hot wind provided from one side of the first side surface to the workpiece (18).

Description

technical field [0001] The invention relates to a heat treatment device which uses circulating hot air to heat workpieces. Background technique [0002] A heat treatment apparatus for heat-treating a workpiece includes a heating device of a hot air circulation system that heats the workpiece using hot air circulating inside a furnace body. In such a heat treatment apparatus of the hot air circulation system, there may be disadvantageous situations in which the temperature distribution of the upper wind and the lower wind of the workpiece is uneven, and the temperature of the lower wind of the workpiece is lowered. The larger the workpiece, the more serious this unfavorable situation has been, and various countermeasures have been taken in the past. [0003] For example, conventionally, there is a technique in which, when forced convection heating is performed on a flat workpiece, the spacer is arranged at an inclination so that the space between the leeward side and the spa...

AI Technical Summary

Problems solved by technology

[0005] In the above-mentioned technique of Japanese Patent Laid-Open Publication No. 11-118356, since the partition plate for changing the flow velocity of the hot air is arranged at an incline, the place where the workpiece is installed increases in the height direction, and as a result, the processing amount of the workpiece decreases.

[0006] In addition, in the technology of the above-mentioned Japanese Patent Laid-Open Publication No. Hei 8-261647, since the traveling direction of the circulating hot air is reversed, the air volume passing through the filter changes rapidly, causing the filter itself to become a source of dust, resulting in Reduced cleanliness inside the furnace

In addition, when the traveling direction of the circulating hot air is reversed, the dust and the like captured by the filter may be separated from the filter and float inside the furnace body.

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