Jan Lipina

Screw connection and its load capacity in components made by rapid prototyping technology

The Department of Robotics at The Faculty of Mechanical Engineering has recently recognized the benefit of using components produced by rapid prototyping technology (RP) [1] over peripherals, in producing and servicing robotic devices. The percentage of the parts produced by rapid prototyping technology in some devices may exceed 80 percent. Employing this technology means, that connecting the various parts of the mechanical structure is done by bolting the joints. In doing so, the question of maximum fastening torque of such joints arose, giving consideration to the unknown mechanical material properties of the parts in the place of force action. This paper will deal with maximal torque and hence the force acting at the screw connection of the part made by RP technology. It also addresses the question of how the size of the area under the bolt head affects the load capacity of screw connection. Great emphasis is assigned to testing the bolt joint load capacity, relevant to the testing of the material samples. Additionally, the article provides specific measurement values, which may serve as a guideline for the design of joints using this concept. The article also builds on the knowledge gained from previous testing of the screw connections made by 3D print technology [2].

Implementation of polycarbonate material mechanical properties of rapid prototyping into system CREO, laboratory verification of the results

The article deals with specification and subsequent implementation of mechanical properties of a polycarbonate material used for functional prototypes produced by Rapid Prototyping based on input data from 3D models designed in CAD system CREO 2.0. The implementation of specific properties of material PC-10 for the printer FORTUS 360mc L in the CAD system will allow a more efficient use of Rapid Prototyping for production of functional prototype parts, because it will be possible to determine their strength characteristics at the design stage by the simulation model analysis.

Shaped Glued Connection of Two Parts Made by Rapid Prototyping Technology

An increasing number of designs and subsequent production of parts created by the Rapid prototyping (RP) [1] technology led to a problem with the maximum workspace of the 3D printer. Due to this reason, it was necessary to work on the solution of joining the parts to overcome the limited workspace of the printer. This article is devoted to glue joints analysis of two parts made by RP technology. A great emphasis is given to the load capacity testing of the parts made this way. The measured values than may serve as a lead for the construction design of the outlined joints. The article builds on the knowledge gained during the previous testing of the screw connections of parts made by 3D printing technology [2].

Bend Testing on Components Manufactured by Rapid Prototyping Technology in Combination with other Materials

The knowledge of the mechanical properties of the material used is a necessary prerequisite for the quality design of any structural unit. It applies to components manufactured using Rapid Prototyping technology (hereinafter only RP) multiple times, because it is not enough to only know the mechanical properties of a material from which the components are printed. Other factors affect the component printing, such as the orientation of the printed component, the selection of the components internal structure, possibility of connection with other materials, etc. The article follows from the previous research of the experimental determination of the bend strength of parts printed by RP technology from polycarbonate, which focuses on bend-testing of samples printed with various internal structures. This article expands on the original research by experimental determination of the bend strength of printed components, which form a unit with another material. The obtained information can be utilised in the design of components manufactured with RP technology using professional printers.

Bend Testing of Parts Made by Rapid Prototyping with Respect to Possible Use in Robotics

Recently, the Rapid Prototyping technology (RP hereafter) has been increasingly used for a final product, which requires detailed knowledge of designing parts made by the RP technology. In order to apply parts made by the RP technology in robotics, and design in general, in a wider range, one of the most important material parameters is their bend strength. The paper describes an experimental determination of bend strength in parts printed on a 3D printer. The parts were made of polycarbonate. The tests were carried out in parts with various types of internal structure. The achieved results can be implemented when designing parts made by 3D printing provided that professional printers are used.

Increasing the load capacity of screw connections in parts produced by the rapid prototyping method

With respect to a wider availability of the Rapid Prototyping (hereinafter as RP) technology, there is a higher number of its applications. Simple demonstration models and models for basic functionality verification gradually turn into more complex construction units. Those must be assembled with respect to the maximum producible part dimensions as well as reasons of unit functionality or fiber orientation concerning anticipated forces applied to the part. The paper follows up previous research of experimental determination of the maximum torque, or more precisely of the force applied in the screw connection point in polycarbonate parts produced by the RP technology. The paper extends the original research with experimental determination of the maximum tightening torque of a screw connection in parts produced by the additive technology FDM, where the samples were supplied with more perimeter contours in the connection point.

Tensile tests on samples manufactured by the rapid prototyping technology in comparison with the commercially manufactured material

For the Rapid Prototyping (“RP”) technology to be usable in the design of equipment (even if only a prototype is to be designed), the material properties of the component so obtained must be known as early as the design stage. Among important properties of materials is their tensile strength. This paper describes tensile tests of samples manufactured by the RP technology. All of the samples had identical dimensions but differed in the internal arrangement of the structures and in the basic orientation of the print. The results are compared to those obtained in the tensile test of polycarbonate manufactured by the conventional process.

Implementation of a cacuum effector for the ABB IRB 140 industrial robot

Clanek se zabýva popisem realizace podtlakoveho efektoru. Na zakladě požadavků jako jsou unosnost 1 kg, maximalni zrychleni 10 m/s2, zdroj energie – vzduch o tlaku 5 bar, řesi navrh těla efektoru, předklada výpocet přisavek i test realizovaneho efektoru vcetně jeho vyhodnoceni.