Abstract Blanking process of sheet metal is accomplished by a shearing action on thin plate placed between two sharp cutting edges, known as “punch” and “die”. The main problem this technology, that causes major shutdowns the press machine, punch wear. Among all blanking parameters, clearance set die has influence tool In context, our study focuses identifying optimum guarantees maximum abrasio...

To be able to understand more in detail what actually happens during chipping, the strain field in a chip during chipping was studied by means of the Digital Speckle Photography (DSP) technique. In addition to recording the strain field, the load on and displacement of the chipping tool was also recorded. The equipment used in this study was a DSP system, an MTS servo hydraulic testing machine ...

Nacrtak Roadside chipping is a common harvesting system to produce chips in Australian plantations. This study investigated the productivity and cost of road-side chipping operation (chipping logs extracted by forwarder to the road side) using a Morbark chipper with flail delimber in a first thinning of Pinus radiata stands. An elemental time study method was used to collect the time working cy...

An earlier analysis of chipping fracture in brittle solids is here extended to include the case of blocks with inclined side faces and non-normal contact loading. The simple relation PF = βKch for the critical chipping load PF in terms of indent location h and material toughness Kc is preserved, with angular coordinates simply incorporated into the β coefficient. Chipping fracture tests using a...

The propagation of cracks in layered glass from low-velocity impact of sharp or spherical tip projectiles is observed using high-speed photography. Tests are also carried out to determine the threshold impact energy for chipping in glass blocks and subsurface crack instability in an edge-supported glass plates. The results identify the median and subsurface radial crack systems as the prime dam...

In recent years, mold manufacturers have had to meet growing demand for high precision molds, low cost and short delivery time due to the miniaturization of finished products, price competition with overseas companies, and reduced model cycles. In line with these market changes, users have been gradually inclined to shift their machining methods applied to key mold parts (made of hardened steel...

Chipping in glass plates from line-wedge contact loading is studied as function of the wedge’s subtended angle 2β, its inclination angle φ, and the distance h from a corner having a subtended angle 90◦−θ . A brittle-fracture analysis in conjunction with the FEM technique is used to elucidate the role of geometric variables on chip morphology and chipping load. Closedform relations are developed...

Machining-induced edge chipping damage represents a common challenge in ceramic applications. This paper reports on responses of zirconia materials with porous and dense microstructures to induced conventional ultrasonic vibration-assisted diamond machining. The machining-induced was evaluated using optical scanning electron microscopies. results show that produced these processes associated br...