| 摘要 |
PROBLEM TO BE SOLVED: To heat-age a test piece under set temperature conditions that have been equated by each device in a bath by providing an air intake hole at the inner deep wall side from a central position for the distance from the opening/ closing door of a test machine bath and at a bottom part being located at the lower portion of a heater. SOLUTION: At a bottom part 12 of a test machine bath 1, at least three heaters 10 are provided in parallel with a specific interval at a specific height from an area near an inner depth wall 11 to an area near an opening/closing door 3. At a bottom 12 of the test machine bath 1, an air intake hole 15 is located at the side of the inner depth wall 11 where distance from the opening/ closing door 3 of the test machine bath 1 is further from the center and at the same time is provided at two locations while being biased to the side of the left and right side walls 13. Also, the air intake hole 15 is located at the lower portion of the heater 10 so that air through the periphery of the heater 10 from the air intake hole 15 can rise in the bath, thus making equal the temperature distribution between the low-temperature part of the side the opening/closing door 3 in the test machine bath 1 and the high-temperature part of the side of the inner depth wall 11.
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