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基于正交试验设计的PVC地板布焊接工艺优化

2021-01-07沈鹤飞,赵民,滕全全,韩晓辉,郑自芹,王浩,徐智宝

粘接 2021年12期

沈鹤飞,赵民,滕全全,韩晓辉,郑自芹,王浩,徐智宝

摘 要:通过正交设计试验对PVC地板布热风焊焊接工艺参数进行优化,分析了不同焊接工艺参数对PVC焊接接头拉伸强度的影响。结果表明:焊接工艺参数对焊接接头拉伸强度影响排序:焊接机温度刻度>新/旧机>是否加盖>焊接机速度刻度>风量档位。正交试验设计的得到的最优工艺参数为:焊接机温度刻度4.5,焊接机速度刻度2.5,风量档位3,不加盖,新焊接机,最优工艺参数下得到焊接接头拉伸强度均值为6.55 MPa,为母材强度的81.8%。对焊接接头的3种断裂模式分析表明,熔合线的粘接强度决定了为PVC地板布焊接接头的拉伸强度,表面熔合质量与根部熔合质量直接影响相应的断裂模式与拉伸强度。

关键词:工艺参数;正交试验; PVC地板布;拉伸强度;热风焊

中图分类号:TQ320 文献标识码:A     文章编号:1001-5922(2021)12-0007-05

Optimization of Welding Process of PVC Floor Cloth Based on Orthogonal Test Design

Shen Hefei1, Zhao Min1, Teng Quanquan2, Han Xiaohui1, Zheng Ziqin2, Wang Hao1, Xu Zhibao2

(1. CRRC QINGDAO SIFANG Co., Ltd., Qingdao 266111,China ; 2. Yantai Branch Corporation Co., Ltd., 52 Institute of China North Industries Group, Yantai 264003, China)

Abstract:Orthogonal design test is adopted to optimize the hot air welding process parameters of PVC floor cloth, and the influence of different welding process parameters on tensile strength of PVC welded joint is analyzed. The results show that influence from large to small is: welding machine temperature scale, new or old machine, cap or not, welding machine speed scale, air volume gear. The optimal process parameters obtained by orthogonal test design are: welding machine temperature scale 4.5, welding machine speed scale 2.5, air volume gear 3, uncapped, new welding machine. Under the optimal process parameters, the average tensile strength value of welded joints is 6.55 MPa, which is 81.8% of the strength of base material. The analysis of three fracture modes of welded joint shows that the bonding strength of fusion line determines the tensile strength of welded joint for PVC floor cloth, and the surface fusion quality and root fusion quality directly affect the corresponding fracture mode and tensile strength.

Key words:process parameters;orthogonal test;PVC floor cloth;tensile strength;hot air welding

0 引言

PVC一般指聚氯乙烯,PVC地板布常用于轨道交通车辆的室内装饰,不但具有美观、环保、易清理等特点,还具有良好的踩踏舒适性、耐用性、隔水性等良好性能[1]。由于车辆内空间及地板布原材尺寸限制等因素,无法使用整张PVC地板布进行铺装轨道车辆,因此,常常使用多幅地板布进行拼装焊接;轨道车辆PVC地板布焊接方式多采用热风焊[2],即使用PVC焊条或其他胶粘剂填充相邻两块地板布之间的缝隙,使其连接起来。这不仅要求对接地板布有良好的外观,还需要保证其不会出现根部未焊透、粘接不牢、焊条脱落、焊线开裂、边缘烫焦等质量问题[3-4]。……

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