No abstract

No abstract

In the publication, the results of an experimental analysis of joint formation by pressing of DX51D steel sheets with thickness of 1.5 (mm) with the use of a rigid punch and an additional deformable rivet of various shapes were presented. The influence of the use of a steel rivet with a diameter d = 5 (mm), similar to the dimensions of the forming punch in the case of the classic clinching variety on the interlock parameters was investigated. The used die was with a four movable segments—dedicated to connections made in the clinch-riveting technology by TOX® PRESSOTECHNIK. In additional, experimental tests were made for joining sheets with a rivet of various shapes, i.e. with a through hole. Joints were formed and the correctness of the upper blockage in the lower sheet was observed on the joints cross-sections. The interlock parameters were measured for each joints samples. In order to compare the influence of using an additional rivet on interlock parameters and joints strength the traditional clinching joints were also made. The minimal thickness of the traditional clinching joint embossment for 2 sheets of 1.5 (mm) thickness for each was X = 0.75 (mm).

Clinching joints with an additional deformable rivet are modifications of the clinching joints. The clinch riveting (CR) joint is formed indirectly by a deformable rivet. The research included an analysis of CR joints’ forming process for aluminum alloy sheets made of AW 6082 in T6 state condition and AW 5754 in three different state conditions: H11, H22 and H24. As a result of forming the joint for various sheet arrangements, the highest value of blocking the upper sheet in the lower sheet (tu) was obtained for the arrangements with two 5754-H24 aluminum alloy sheets. For such a large interlock parameter tu, the greatest thinning of lower sheet (tn) was obtained, which influenced the maximum tensile shear force and the joint failure mechanism. Based on the load-displacement diagrams obtained from the static shear test of lap joints, the total energy of failure and energy to achieve the maximum load capacity were calculated. The highest energy absorption to achieve the maximum load capacity, in the case of the same sheet materials, was obtained for the 5754-H11 aluminum alloy sheets. On the other hand, among the tested combinations, the highest value of energy absorption (for the joint maximum load capacity) was obtained for the sheet arrangement: top sheet AW 6082-T6 and the bottom AW 5754-H24. The highest value of the total energy up to fracture was obtained when the material of the top sheet was AW 6082-T6, and the bottom AW 5754-H22. For each sheet arrangement, a similar analysis of the joint strength parameters, interlock parameters and forming force were made.

AEåøóâñüêèé òåõíîëîã³÷íèé óí³âåðñèòåò, AEåøóâ, Ïîëüùà Âèêîíàíî ÷èñåëüíèé ðîçðàõóíîê íàïðóaeåíü ó ãíó÷êîìó ñïëàéí³ çóá÷àòî¿ ïåðåäà÷³ ãàðìîí³÷íîãî (õâèëüîâîãî) ðåäóêòîðà. Çóá÷àòå ê³ëüöå ó ãíó÷êîìó ñïëàéí³ ÷åðåç ñêëàäíó ãåîìåòð³þ ìîäåëþâàëîñü ó âèãëÿä³ ê³ëüöÿ. Âèñîòó ê³ëüöÿ ïðèéìàëè ç óðàõóâàííÿì íàïðóaeåíîñò³ â çóáöÿõ. Äëÿ âèâ÷åííÿ âïëèâó ð³çíèõ òèï³â õâèëüîâèõ ãåíåðàòîð³â íà ðîçïîä³ë íàïðóaeåíü ó ãíó÷êîìó ñïëàéí³ ðîçãëÿäàëè ìîäåë³ ç äâîìà òà ÷îòèðìà ðîëèêàìè, åêñöåíòðèêîì àáî äèñêîì. Ðîçðàõóíîê íàïðóaeåíü âèêîíóâàëè äëÿ äâîõ âàð³àíò³â: áåç îáåðòàëüíîãî ìîìåíòó òà ç îáåðòàëüíèì ìîìåíòîì, ùî â³äïîâ³äຠðåàëüíèì óìîâàì ðîáîòè ãåðìåòè÷íîãî ãàðìîí³÷íîãî ðåäóêòîðà.Êëþ÷îâ³ ñëîâà: ãåðìåòè÷íèé ãàðìîí³÷íèé (õâèëüîâèé) ðåäóêòîð, ðîçïîä³ë íàïðóaeåíü, ñê³í÷åííîåëåìåíòíèé àíàë³ç.

No abstract

The clinching joining technology is one of the most popular joining technologies by redrawing sheet material. The joining process parameters, the sheet material and its arrangements influences joints' strength. Cylindrical axial-symmetrical joints formed by using rigid die and punch are still developed. The change of the rigid die on the die with movable segments affect the forming process and joint strength parameters. So there is a need to do experimental researches of the possibilities of joint formation by unchanged punch geometry and different die shape. In this article the forming process parameters (forming force, process energy consumption and its standard deviations) and joints strength parameters (maximum shearing force, total dissipated energy and dissipated energy up to 0.3 maximum force), according to the ISO 12996 standard, for the joints formed with using die with 2, 3 and 4 movable segments were presented. The punch geometry was unchanged and the minimum thickness of the embossment was also unchanged. For the die with 2 and 4 segments the load force direction influence on the joints strength was also presented.

The application of X-ray micro-diffraction to study the local changes in austenite content in clinching joints made of DP 600 steel is presented. The relations between various parameters of the cold pressing process and the microstructure and the austenite content in the individual parts of the clinching joints are shown.