US 9,810,416 B2
Method for manufacturing a lamp-housing-type heat-sink, lamp-housing-type heat-sink, and LED lighting device
Kai Chen, Zhejiang (CN); Jianming Huang, Zhejiang (CN); and Huali Lu, Zhejiang (CN)
Assigned to HANGZHOU HPWINNER OPTO CORPORATION, Hangzhou, Zhejiang (CN)
Appl. No. 14/354,535
Filed by HANGZHOU HPWINNER OPTO CORPORATION, Zhejiang (CN)
PCT Filed Sep. 20, 2012, PCT No. PCT/CN2012/081647
§ 371(c)(1), (2) Date Apr. 25, 2014,
PCT Pub. No. WO2013/060211, PCT Pub. Date May 2, 2013.
Claims priority of application No. 2011 1 0329640 (CN), filed on Oct. 26, 2011; and application No. 2011 2 0413445 U (CN), filed on Oct. 26, 2011.
Prior Publication US 2014/0247609 A1, Sep. 4, 2014
Int. Cl. F21V 29/00 (2015.01); F21K 9/90 (2016.01); B21D 51/16 (2006.01); F21V 29/89 (2015.01)
CPC F21V 29/22 (2013.01) [B21D 51/16 (2013.01); F21K 9/90 (2013.01); F21V 29/89 (2015.01); Y10T 29/49117 (2015.01)] 16 Claims
OG exemplary drawing
 
14. A method for manufacturing a lamp-housing-type heat-sink in an LED lighting device, comprising the following steps:
(1) taking a high purity aluminum plate with a thickness of 0.5 mm to 5 mm and an aluminum content of above 95% as per a pre-designed size, and blanking the plate to an external profile needed by a housing;
(2) first spinning the high purity aluminum plate into an open hollow piece, wherein a diameter of the open end of the workblank is not smaller than a diameter of the closed end after the first spinning;
(3) second spinning the workblank to reduce the diameter of the open end and spin the open end into a predesigned radian such that a sidewall of the workblank extends from the open end to the closed end and is tapered towards an open end of the workblank;
(4) blanking the side surface of the workblank to obtain a hollow high purity aluminum housing.