Determination of rotary cutting depth on steel pipes with the abrasive water jet technique

Abstract

Abrasive water jet (AWJ) cutting is a green machining and processing technology that has found extensive applications. In this study, a well-designed cutting tool with multiple AWJ nozzles has been developed to determine the rotary multi-pass cutting depth on steel pipes that are used in petroleum industries. Experimentally, the multi-pass AWJ cutting depth is found to increase with pump pressure, nozzle diameter, and number of nozzles, but decrease with standoff distance. Also, the multi-pass cutting depth initially increases with rotation speed of the AWJ cutting tool or volumetric concentration of abrasive, and then begins to decline when rotation speed or volumetric concentration reaches a certain value. Mathematically, an empirical model is formulated to determine the rotary cutting depth initiated by multiple cutting passes based on the energy conservation theory. There exists a good agreement between the experimentally measured and theoretically calculated cutting depths with a percentage average absolute deviation of 7.0 per cent.

Nghiên Cứu Động Lực Học Máy Cắt Ống Thép D45 Và Xác Định Các Tổn Thất Hệ Thống Nhằm Nâng Cao Hiệu Suất Của Bơm Thủy Lực

“…Khung ống thép được sử dụng rộng rãi vì thuận lợi cho việc sửa đổi, sửa chữa, thuận lợi cho việc thiết kế và giá thành rẻ. Hiện nay có nhiều phương pháp cắt ống thép sử dụng trong công nghiệp như cắt bằng tia nước (AWJ) [1], cắt bằng tia lazer [2], cắt plasma [3], cắt cưa dây kim cương [4], cắt ống thép bằng máy thủy lực có kiểu cắt hành tinh [5] nhưng chỉ cắt được các loại ống thép đầu thẳng, không cắt được đầu cong của khung xe vì phải quay tròn phôi tương đối với dụng cụ cắt (đầu cắt) nên rất khó xác định vị trí quá trình cắt tạo ra biên dạng mối ghép.…”

Effects of Focus Geometry on the Hard Rock‐Cutting Performance of an Abrasive Waterjet

“…e MTP due to wall friction and mixing losses strongly affects the cutting performance, and previous experimental results have shown that this parameter increases with increasing water pressure [20,34,36]. Other studies have indicated that the MTP, which is due to the interaction of the abrasive and water with the walls of the mixing chamber and focus, depends on the focus geometry [37][38][39][40], but there is a lack of research describing the characteristics of the MTP. By estimating the cutting energy according to the AFR, the MTP can be evaluated.…”

Experimental Study on the Dynamic Rock-Breaking Performance of Pulsed Abrasive Jet Drilling Method

“…e pulsed jet can reduce the pressure holding effect of bottom-hole rock, improve the stress state of rock, and enhance the effect of rock breaking and rock cleaning [8]. Both the abrasive water jet and pulsed water jet have distinctive characteristics [9][10][11][12][13][14][15], using some appropriate modulation methods can integrate their rockbreaking advantages and get a much better effect than using any of them alone.…”