發(fā)布時間：2018-11-06 18:01

【摘要】：為改善蜂窩板式換熱器機械強度,提高蜂窩板沖壓成型極限,對板片焊接極限粘結(jié)力和沖壓破裂極限強度的主要影響因素:焊點形狀、焊接功率、焊接速度、焊接點距和焊點分布形式進行了優(yōu)化,利用數(shù)控激光焊接機、拉力試驗臺和水壓泵等試驗設(shè)備,進行了單因素和多因素焊接薄板機械強度測試試驗。單因素試驗結(jié)果表明:相同工況下,螺旋焊點的薄板極限機械強度最大,表現(xiàn)為隨焊接功率、焊接速度的增大,焊點極限機械強度先增加后減小;等邊三角形焊點分布薄板沖壓破裂的極限壓強較大,隨焊點距離增大迅速減小。正交試驗表明:在螺旋焊點和等邊三角形焊點分布下,焊接點距為50 mm、焊接功率為2.2 k W、焊接速度為2.5 m/min時,薄板沖壓成型破裂極限最大,為8.6 MPa。較現(xiàn)有焊接工藝的沖壓成型極限提升了7.5%。
[Abstract]:In order to improve the mechanical strength of honeycomb plate heat exchanger and increase the forming limit of honeycomb plate, the main factors affecting the ultimate bonding force and breaking strength of sheet metal are: solder joint shape, welding power, welding speed, etc. The welding spot distance and the distribution of solder joint were optimized. The mechanical strength tests of single factor and multi-factor welded sheet were carried out by means of numerical control laser welding machine, tensile test bench and hydraulic pump. The results of single factor test show that the ultimate mechanical strength of the spiral solder joint is the largest under the same working conditions, which is shown as follows: with the increase of welding power and welding speed, the ultimate mechanical strength of the solder joint increases first and then decreases; The limit pressure of punching fracture of thin plate with equilateral triangle solder joint distribution is larger and decreases rapidly with the increase of solder joint distance. The orthogonal test shows that under the distribution of spiral solder joint and equilateral triangle solder joint, when the welding point distance is 50 mm, the welding power is 2.2 kW, and the welding speed is 2.5 m/min, the fracture limit of sheet metal is the largest, 8.6 MPa.. Compared with the existing welding process, the forming limit of stamping raised 7.5%.
【作者單位】： 中國農(nóng)業(yè)機械化科學(xué)研究院;河南科技大學(xué)農(nóng)業(yè)工程學(xué)院;
【分類號】：TQ051.5;;TG44
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本文編號：2315054