| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a heat radiation part of an LED bulb in which the heat radiation part of the LED bulb can be manufactured by applying a drawing process in a plurality of times to an aluminum alloy blank material, manufacturing cost can be reduced, and furthermore, heat radiation performance by no means inferior compared with the heat radiation part made from die-casting of aluminum alloy can be obtained, and the heat radiation part of LED bulb manufactured by the manufacturing method.SOLUTION: A heat radiation part 1 of container shape is formed by applying a plurality of times drawing process on an aluminum alloy blank material 1A with a plate thickness 0.3-2.5 mm. In that case, the cross-section of the outer circumferential body 1a of the heat radiation part 1 is formed in a radial shape in which a continuous wavelike upheaval 1b is formed, and when the diameter of the circumscribing circle of the cross-section of the outer circumferential body 1a is made D1, the diameter of the inscribed circle is made D2, D1/D2 is made more than 1.3 and the number of wavelike upheaval 1b is made 8 or more. |
