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Schematic drawing of clamping mechanism on CNC lathe; 1) Rotating hydraulic clamping cylinder, 2) Adapter of clamping cylinder, 3) Pulley of main drive, 4) Draw bar, 5) Spindle, 6) Chuck, 7) Jaws; Fa-actuating force of clamping cylinder, Fg-chuck gripping force.
Source publication
In this paper thin-walled part deformation during finishing turning process caused by gripping force of hydraulic lathe chuck was investigated. Bearing ring was taken as an example of thin-walled part undergo finishing turning operation. Finite Element Method (FEM) was used to define the deformation of examined part. The aim of presented research w...
Context in source publication
Context 1
... induced by gripping force were conducted for 3-jaw chuck and 6-jaw chuck (Fig. 2). Most of modern CNC lathes are equipped with hydraulic cylinder which control the opening of lathe chuck. Depends on the application, hollow and partially-hollow cylinders are in use. The principle of operation for clamping mechanism on CNC lathe is presented in fig. 3. For further analysis partially-clamping cylinder SMW SIN-S 100 was assumed. The ope- rating range of clamping cylinder were limited to 7÷40 bar. Active piston area of selected cylinder is 66 cm 2 [8]. The theoretical characteristic of cylinder SIN-S100 is shown in fig. 4. [8] Machining process of thin-walled parts require possibly low ...
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Citations
... The efforts to minimise the weight of the produced parts and the accompanying technological difficulties related to, i.e., the machining of thin-walled elements are significant issues both from the scientific and practical points of views. Various sectors, in particular the aviation industry, currently struggle with the issue of unwanted deformations of thinwalled elements following the completed machining process, and the removal of the force holding a given workpiece [23][24][25]. The deformations may range from several micrometres in the case of small parts to several or even a dozen centimetres in large-sized parts [7]. ...
The aim of this paper is to analyse the effect of the selected geometric properties of thin-walled structures on post-machining deformations. In the study, EN AW-7075 T651 and EN AW-6082 T651 aluminium alloys were used to prepare specially designed thin-walled sample elements, i.e., elements with walls arranged in a semi-open and closed structure and with a dimension of 165 × 262 × 50.8 mm consisting of bottom and vertical stiffening walls and so-called ribs with a thickness of 1 mm. The measurements of the absolute deformations of the thin-walled bottom were performed with the use of a Vista coordinate-measuring machine by Zeiss with a PH10 head by Renishaw. Based on the obtained results, it was found that absolute deformation values were higher for walls arranged in a semi-open structure. It is related to a lower rigidity of the tested structure resulting from the lack of a stiffening wall, which is the so-called “rib”. Notwithstanding the geometry of the elements, greater absolute deformation values were recorded following conventional cutting methods. The use of high-speed cutting (HSC) provided positive outcomes in terms of minimising the deformation of thin-walled elements. Additionally, it was found that higher absolute deformations were obtained for EN AW-7075 T651 alloy.
