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Double enveloping worm gear modelling using CAD environment

Połowniak Piotr, Sobolak Mariusz, Marciniec Adam

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2021

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Vol. 69, nr 2

art. no. e136736

EN

This study describes the methodology for modelling a worm and worm wheel of a double enveloping worm gear with the use of a CAD system. An algorithm for generating a globoid helix is described. In addition, the methodology for modelling an hourglass worm thread with a straight axial tooth profile is presented. The shape of the hourglass worm tooth end with and without a trace modification is proposed. Moreover, a method for achieving a geometric modification of the tooth trace was developed. Next, the method for modelling the worm wheel teeth is described. A solid model of using a machining worm as a hob is applied. Owing to the limitations of a CAD system, which prevents the use of a direct machining simulation, an indirect modelling method is introduced. In the present study, different CAD techniques, both solid and surface, are applied. Knowledge of the correct modelling of the hourglass worm and worm wheel facilitates their generation and conducting various analyses, including a tooth contact analysis. CAD models are utilised to analyse the geometrical contact pattern in a CAD environment, to carry out FEM analysis, to manufacture real parts or to prototype models using the technique of rapid prototyping. They can be also used as master models for measurement, e.g. in optical technics.

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Innovative device for tensile strength testing of welded joints: 3d modelling, FEM simulation and experimental validation of test rig – a case study

Sawa Mateusz, Szala Mirosław, Henzler Weronika

Applied Computer Science

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2021

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Vol. 17, no 3

92--105

EN

This work shows a case study into 3D modelling, numerical simulations, and preliminary research of self-designed test rig dedicated for uniaxial tensile testing using pillar press. Innovative device was CAD modelled, FEM optimized, build-up according to the technological documentations. Then, the device utilization for tensile testing was validated via preliminary research. 3D model of the device was designed and FEM-analyzed using Solid Edge 2020 software. The set of FEM simulations for device components made ofstructuralsteel and stainless steel and at a workload equal 20 kN were conducted. This made it possible to optimize dimensions and selection of material used for individual parts of the device structure. Elaborated technical documentation allows for a buildup of a device prototype which was fixed into the pillar press. After that, the comparative preliminary experiments regarding tensile strength tests of X5CrNi18-10 (AISI 304) specimens were carried out. Tests were done using the commercial tensile strength machine and obtained results were compared with those received from an invented device. The ultimate tensile strength of X5CrNi18-10 steel, estimated using the commercial device (634 MPa) and results obtained from the patented device (620 MPa), were in the range of the standardized values. Findings confirm the utilization of the invented device for tensile strength testing.

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Application of CAD modelling in preparation of a grinding wheel used in shaping of a worm thread outline

Skoczylas Leszek, Bełzo Artur, Wdowik Roman

Technologia i Automatyzacja Montażu

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2020

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nr 3

53--57

EN

This paper presents overall description of the cylindrical worm thread grinding process. The grinding wheel CAD model was developed by the use of Boolean operation in the CAD software. The model is universal and is a basis for dressing of a grinding wheel according to the chosen shape. The tools were prepared in the way that allow to grind any contours of the worm thread.

PL

W artykule przedstawiono ogólny opis procesu szlifowania ślimaków walcowych przekładni. Model CAD ściernicy został opracowany przy użyciu operacji Boole’a w programie CAD. Model jest uniwersalny i stanowi podstawę do obciągania ściernicy zgodnie z wybranym kształtem. Narzędzia przygotowane w sposób pozwalający na szlifowanie dowolnych geometrii zwoju ślimaka.

4

Formulation of 3D shoe sizes using scanning camera and CAD modelling

Butdee S., Tangchaidee K.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 31, nr 2

449-455

EN

Purpose: This paper purposes to formulate 3D shoe size by using scanning camera and link to CAD modeling. Design/methodology/approach: The research design is divided into four groups with different ages and sex. The first group is boys and girls with 6-10 years old. The second group is teenagers with 11 - 20 years old. The third group is university students and working people with 21-30 year olds. The last group is professional working people group with 31 - 48 years old. The sample populations are selected and measured their feet both left and right sides. Each group contains ten to eighteen people except the child group which contains three to five children. The sampling sizes are 97 people. The 3D scanning camera is used in order to obtain the all sides of the feet. The process contains five steps in five foot positions; the middle foot, the 45° left foot, the 90° left foot, the 45° right foot, 90° right foot. The foot data image of all the sampling populations are classified in the same and similar sizes. Eight groups are determined that is formulated by eight sizes of the Thai shoe size. The size is started from the 19 W7.4 H6.7 to 27 W10.8 H9.1 which represents 3D shoe size. Findings: The research result has investigated the new standard size model based on Thai local populations in 3D models. This study shows precisely the customized shoe sizes for individual people as well as the grouping shoe sizes for Thai people. Practical implications: It can make benefits for shoe designers, customers and manufacturers. Originality/value: This study shows precisely the customized shoe sizes for individual people as well as the grouping shoe sizes for Thai people.