WO2021253522A1 - 一种超高速激光熔覆增材制造的装置和方法 - Google Patents
一种超高速激光熔覆增材制造的装置和方法 Download PDFInfo
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Abstract
Description
Claims (10)
- 一种超高速激光熔覆增材制造的装置,其特征在于,包括激光发生器(1)、扩束镜(2)和反光镜(4),所述反光镜(4)的出射光路正对熔覆喷嘴(17),所述熔覆喷嘴(17)依次通过软管(8)和泵(7)与粉末池(6)连接,所述熔覆喷嘴(17)的下方设有基体(14),所述基体(14)位于旋转平台(13)上,所述旋转平台(13)的下方固定安装主步进电机(11),所述主步进电机(11)固定在升降平台(10)上,所述基体(14)的上方设置有激光测距仪(20)。
- 根据权利要求1所述的一种超高速激光熔覆增材制造的装置,其特征在于,所述熔覆喷嘴(17)固定在电动滑块A(21)上,所述熔覆喷嘴(17)通过所述电动滑块A(21)在电动滑轨A(22)上移动,所述电动滑轨A(22)固定在电动滑块B(23)上,所述电动滑轨A(22)通过所述电动滑块B(23)在电动滑轨B(24)上移动,所述反光镜(4)通过转动轴与电动滑块C(25)相连,所述反光镜(4)通过所述电动滑块C(25)在电动滑轨C(26)上移动。
- 根据权利要求2所述的一种超高速激光熔覆增材制造的装置,其特征在于,所述旋转平台(13)上设置有若干超声振动平台(15),每个所述超声振动平台(15)上放置有基体(14),每个所述超声振动平台(15)通过副步进电机(12)在旋转平台(13)上旋转。
- 根据权利要求3所述的一种超高速激光熔覆增材制造的装置,其特征在于,所述基体(14)的上方设置有红外摄像机(18)和高速摄像机(19)。
- 根据权利要求4所述的一种超高速激光熔覆增材制造的装置,其特征在于,所述基体(14)的上方设置有放射探伤系统(16)。
- 根据权利要求5所述的一种超高速激光熔覆增材制造的装置,其特征在于,所述激光发生器(1)、泵(7)、升降平台(10)、主步进电机(11)、副步进电机(12)、超声振动平台(15)、电动滑块A(21)、电动滑块B(23)和电动滑块C(25)、放射探伤系统(16)、红外摄像机(18)、高速摄像机(19)和激光测距仪(20)均通过信号线(5)与控制系统(9)相连。
- 根据权利要求1至6所述的任意一种超高速激光熔覆增材制造的装置,其特征在于,激光发生器(1)为光纤激光发生器,波长:1080nm,额定输出功率:4000W,焦距:280mm,功率可调范围:5~100%;光纤输出接口:QCS;焦斑光强分布:平顶;激光工作模式:CW;输出功率稳定性:<3%;激光器专用云服务远程诊断系统;15m传输光纤。
- 一种利用权利要求6所述的超高速激光熔覆增材制造的装置进行增材制造的方法,其特征在于,包含以下步骤:S1将基体(14)打磨、清洗和吹干,并对其进行预热;S2将基体(14)固定至超声振动平台(15)上,控制升降平台(10)微调使基体(14)与喷嘴(17)之间 有一个合适的距离H;控制电动滑块B(23)带动喷嘴(17)移动至旋转平台(13)最内侧;激光测距仪(20)测定到基体(14)的距离D1;S3主步进电机(11)带动旋转平台(13)开始转动,使基体(14)和熔覆喷嘴(17)产生相对位移;S4控制泵(7)开始工作,将粉末由粉末池(6)通过熔覆喷嘴(17)喷射至基体(14)表面;激光发生器(1)输出激光通过喷嘴(17)聚焦到基体(14)表面,熔化喷至基体(14)表面的粉末;超声振动平台(15)开始振动和旋转,使喷至基体(14)表面的粉末得以完全熔化,减少孔隙的产生;S5红外摄像机(18)拍摄熔池的温度,高速摄像机(19)拍摄熔池的宽度并将其反馈给控制系统(9),以此判断粉末熔化是否充分,紧接着动态控制旋转平台(13)转速以达到一个合适的激光能量密度;动态控制超声振动平台(15)振动频率,使得粉末可以被充分熔化;S6激光测距仪(20)测定到熔覆层的距离D2,计算出熔覆层厚度D2-D1,判断熔覆层厚度是否达到预期要求,紧接着动态控制送粉率,保证熔覆层厚度均匀;S7当旋转平台(13)完整旋转一圈后,激光暂停输出,泵(7)暂停送粉;电动滑块B(23)带动熔覆喷嘴(17)向旋转平台(13)外侧移动一定距离X;S8重复步骤S4,S5,S6,S7直至一层的增材制造加工完成;S9主步进电机(11)停止旋转,使用放射探伤系统(16)对完成的熔覆层进行无接触探伤,并记录下缺陷的位置;S10控制电动滑块B(23)沿着电动滑轨B(24)移动,带动喷嘴(17)移动至旋转平台(13)最内侧;升降平台(10)下降一定的高度H;超声振动平台(15)旋转一定的角度α;S11控制系统(9)根据放射探伤系统(16)所记录下缺陷的位置,将下一层超高速激光熔覆增材制造过程中的参数进行改变,使得喷嘴(17)在经过缺陷上方时,增大激光功率,增大送粉率,已达到重熔修复缺陷的目的;S12重复步骤S3,S4,S5,S6,S7,S8,S9,S10,S11直至所有的增材制造加工完成。
- 根据权利要求8所述的一种利用权利要求6所述的超高速激光熔覆增材制造的装置进行增材制造的方法,其特征在于,在超高速激光熔覆增材制造过程中,喷嘴(17)通过电动滑块A(21)在电动滑轨A(22)上移动,以改变熔覆喷嘴(17)轴线与基体(14)表面的夹角,以此克服基体(14)表面熔融态粉末由于旋转而产生的离心力;同时,反光镜(4)可以围绕转轴旋转,并通过电动滑块C(25)在电动滑轨C(26)上移动,以改变反射光的角度和位置,使反射光可以通过反光镜(4)进入熔覆喷嘴(17);喷嘴(17)轴线与基体(14)表面的夹角由熔覆喷嘴(17)到旋转平台(13)轴线的距离以及旋转平台(13)转速决定。
- 根据权利要求8所述的一种利用权利要求6所述的超高速激光熔覆增材制造的装置进行 增材制造的方法,其特征在于,所述步骤S8和步骤S12在熔覆过程中,激光发生器(1)的激光功率3000~4000W;扫描速度1~200m/min;光斑直径1~3mm;搭接率0~100%;熔覆层厚度10~1000μm。
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