China
Africa
Explore chapters and articles related to this topic
Material removal
Published in Roger Timings, Fabrication and Welding Engineering, 2008
Where a number of holes of a standard size are to be cut in sheet metal or thin plate a hole saw, such as the example shown in Fig. 6.28, can be used. The balanced cutting action of a hole saw leaves a hole that is more truly round than a trepanning cutter and the finish will be better. Again, a small diameter pilot hole is required to guide the hole saw.
Effect of geometrical parameters and tool pattern of multi-tooth sawing on cutting of sheet molding compound composite: FE study
Published in Machining Science and Technology, 2022
Amira Hassouna, Slah Mzali, Farhat Zemzemi, Salah Mezlini
As illustrated in Figure 1a, the hole saw tool (Sandvik Company, UK) used in the drilling process consists of multiple non-offset teeth rotating around the tool axis. In order, to simulate this process, taking into account the interaction between the teeth, a simplified configuration composed of three equidistant teeth with linear displacement is modeled (Figure 1b). The band-saw blade and its representative model, respectively, presented in Figure 1c and d, are made up of multiple offset teeth. The presence of the offset minimizes the friction and facilitates the chip flow. By combining the two previously mentioned configurations, (i) the tool geometry of hole saw and (ii) the offset between the teeth of band-saw blade, a new tool design is proposed (Figure 1e). The cutting and geometric parameters of the representative model adopted in this work are shown in Figure 1e, where (s), (ap), (p), and (t) represent the offset, the cutting depth, the pitch, and the tooth thickness, respectively.
Experimental and numerical study of the joinability of sheets by sheet-bulk forming
Published in International Journal for Computational Methods in Engineering Science and Mechanics, 2019
I. M. F. Bragança, M. A. R. Loja, C. M. A. Silva, L. M. Alves, P. A. F. Martins
The stress-strain curve of the aluminium alloy EN AW 5754 H111 sheets with 5 mm thickness was performed by means of stack compression tests while polycarbonate, since is pressure sensitive, was determined by means of compression and tensile tests [3]. The cylinder test specimens were assembled by pilling up 3 circular discs machined out of the supplied aluminium and polycarbonate sheets by a hole-saw and turning. To determine the tensile stress-strain curve, the test specimens were machined out of the supplied sheets in accordance to the ASTM D 638 standards. The compression tests were performed at room temperature on a hydraulic testing machine (Instron SATEC 1200 kN) and the resulting stress-strain curves are shown in Figure 2.