Effect of Waterjet Machining Parameters on the Cut Quality of PP and PVC-U Materials Coated with Polyurethane and Acrylate Coatings

Abstract

The article focuses on the machining of polymeric materials polypropylene (PP) and un-plasticized poly vinyl chloride (PVC-U) after surface treatment with polyurethane and acrylate coatings using waterjet technology. Two types of waterjet technologies, abrasive waterjet (AWJ) and waterjet without abrasive (WJ), were used. The kerf width and its taper angle, at the inlet and outlet of the waterjet from the workpiece, were evaluated. Significant differences between AWJ and WJ technology were found. WJ technology proved to be less effective due to the creation of a nonuniform cutting gap and significant burrs. AWJ technology was shown to be more efficient, i.e., more uniform cuts were achieved compared to WJ technology, especially at a cutting head traverse speed of 50 mm·min−1. The most uniform kerf width or taper angle was achieved for PP + MOBIHEL (0.09°). The materials (PP and PVC-U) with the POLURAN coating had higher values of the taper angle of the cutting gap than the material with the MOBIHEL coating at all cutting head traverse speeds. The SEM results showed that the inappropriate cutting head traverse speed and the associated WJ technology resulted in significant destruction of the material to be cut on the underside of the cut. Delamination of the POLURAN and MOBIHEL coatings from the base material PP and PVC-U was not demonstrated by SEM analysis over the range of cutting head traverse speeds, i.e., 50 to 1000 mm·min−1.

Tribological Behaviour of Enamel Coatings Created by a Prototype Device for Local Repair of Inorganic Surfaces

“…When using conventional methods [ 19 , 20 , 21 , 22 ] of dividing materials with different coatings and surface treatments, they can be damaged, for example, by delamination, especially due to the contact of the tool with the workpiece. Research has shown that it is appropriate to use an unconventional machining method using water jet technology [ 20 , 23 , 24 ] characterized by considerable flexibility of adjustable machining parameters. However, it is necessary to take into account the optimization of the cutting process for a specific application.…”

Automated Composite Pipe Cutting Machine for ASTM Standard Testing Specimen Preparation

“…However, these cutting methods are not suitable for CIPP specimen preparation. The water jet cutting method will leave the nonuniform cutting gap and significant burrs [6], which will significantly affect the result of the bending test and tensile test due to the change of the cross-section area. Besides, water jet cutting machines usually require a large set-up space, which is not friendly to small businesses.…”

Modeling and Machine Learning of Vibration Amplitude and Surface Roughness after Waterjet Cutting

“…This is particularly crucial for precision cutting applications [11]. Additionally, in many cases, especially for rough machining, waterjet cutting eliminates the need for additional operations such as milling, resulting in time and cost savings [12]. Consequently, waterjet cutting has gained popularity as a surface treatment technology, surpassing other cutting methods, such as laser cutting and plasma cutting [12,13].…”

“…Additionally, in many cases, especially for rough machining, waterjet cutting eliminates the need for additional operations such as milling, resulting in time and cost savings [12]. Consequently, waterjet cutting has gained popularity as a surface treatment technology, surpassing other cutting methods, such as laser cutting and plasma cutting [12,13]. Various researchers have employed both vibration and acoustic emission for the real-time monitoring of the AWJ (abrasive waterjet) process [14,15].…”

“…11 12 13 14 15 16 17 18 18 19 20 21 22 23 24 25 26 27 28 29 30 Acceleration, a [m/s 2 ] Time, t [s] Z-axis vibration…”