Wyniki wyszukiwania - BazTech

1

Optimization of machining parameters during end milling of super alloys using grey based Taguchi method coupled with entropy measurement technique

Sreenivasulu Reddy, Rao Chalamalasetti Srinivasa

Journal of Mechanical and Energy Engineering

|

2020

|

Vol. 4, No 1

47--56

EN

High-quality products include those with better surface quality and texture, close dimensional tolerances and form accuracies at precise level, increase fatigue life and burr-free. Burr formation is one of the most common inevitable facts occurring in all material removal processes, reduces assembly and machined part quality. But, burr formation during milling is a more complex mechanism compare to remaining machining burrs and leads to numerous difficulties during the deburring process. To prevent this, one should optimize the combination of cutting parameters during machining itself. In order to build up a link between quality and productivity and to attain the same in the cost-effective way, the present work concentrate on multi objective optimization of CNC end milling process parameters. Multiple performance characteristics with respect to surface quality and performance index like assembly work have been put up, to assess an equivalent single quality index (called grey relational grade) has been optimized finally by Grey based Taguchi method. After that priority weight of individual quality and performance attributes has been estimated by entropy measurement technique on the basis of relative significance and check the feasibility of the proposed technique has been demonstrated in this context.

2

Stages of designing and making a pressing tool for gutter corner halves with a complicated shape. The milling methods

Sdzuj Sebastian, Winchula Łukasz

Mechanik

|

2019

|

R. 92, nr 10

646--648

EN

Design features were described, applied in order to adapt complicated parts of a pressing tool to the capabilities of a 3-axis vertical machining center. The design and selection of base surfaces making possible precise positioning in the milling machine and in the tool are discussed.

PL

Opisano zastosowane podczas realizacji projektu zabiegi konstrukcyjne mające na celu dostosowanie skomplikowanych elementów oprzyrządowania do możliwości trzyosiowego pionowego centrum obróbkowego. Wyjaśniono sposób projektowania i doboru powierzchni bazujących umożliwiających precyzyjne pozycjonowanie elementów w obrabiarce i przyrządzie.

3

The digitisation for the immediate dental implantation of incisors with immediate individual prosthetic restoration

Dobrzański L. B., Achtelik-Franczak A., Dobrzańska J., Dobrzański L. A.

Journal of Achievements in Materials and Manufacturing Engineering

|

2019

|

Vol. 97, nr 2

57--68

EN

Purpose: The purpose of this study is to present the author's method of planning the procedure of immediate implant-prosthetic restoration in place of a tooth qualified for removal by performing a surgical template and implant-prosthetic restoration based on data obtained in the CBCT test and intraoral scanning 3D model. Design/methodology/approach: The method of planning the implant surgery through the design and manufacture of surgical templates and implant prostheses performed before the start of medical procedures was described on the basis of actual clinical data from patients with anterior segment teeth qualified for extraction for reasons of complications after endodontic treatment. The placement of the implant was planned using virtual reality, where the bone model and the virtual soft tissue model were combined, which made it possible to perform a surgical template and prosthetic implant restoration. For the manufacturing, 3D printing as stereolithography SLA and selective laser sintering SLS for the surgical template manufacturing and CNC milling in the case of the prosthetic implant were used for restoration. Findings: The method allows planning the implant position based on two connected bone and soft tissue models and allows to design and manufacture a surgical guide. In this way, it becomes possible to place implants in the patient's bone during surgery procedure in the planned position and to install the prosthetic implant restoration in the form of an individual abutment and a PMMA crown during the same procedure in the surgical part. Practical implications: Thanks to the method of computer-aided design/manufacturing CAD/CAM production of surgical templates and prosthetic restoration based only on digital models and the planned position of the implant, it is possible to carry out the procedure of immediate tooth extraction and replacement with permanent prosthetic restoration. The whole process is based on the CBCT test performed at the beginning. The presented method allows shortening the procedure time by four times and the rehabilitation time by 3-6 months when performing the procedure in a minimally invasive manner. Originality/value: This article presents the original design and production method of surgical guides. It allows for precise planning of the implant position and transfer of this data to the patient's mouth during the procedure, enabling permanent prosthetic restoration before starting medical procedures.

4

Frezowanie CNC - informacja nie tylko dla ucznia

Świat Obrabiarek i Narzędzi

|

2014

|

R. 9, nr 1-2

23