| Title |
Azotavimo įtakos karštojo štampavimo štampų įdėklų eksploatavimo laikui tyrimas / |
| Translation of Title |
Research of nitriding influence on of hot forging dies life time. |
| Authors |
Savickas, Tadas |
| Full Text |
|
| Pages |
49 |
| Keywords [eng] |
nitriding ; forging ; hardness |
| Abstract [eng] |
This thesis investigates nitriding influence on hot forged hot forging die inserts operation lifetime. The first part of thesis consistently describes pressure metalworking and other possible thermal and thermochemical material iprovement methods. In particular forging with crank hot stamp presses in closed dies also nitriding process features. Second part of thesis examines cog wheel workpiece manufacturing technology, investigation methods used also thermal and thermochemical processes on inserts were examined. Research was made on thermaly improved and nitrided inserts, before and after hot forging also research of metallographic and mechanical properties. Mircohardness and microstructure investigated on the inserts forming surface up to 0,5 mm deep. Third part provides researched inserts microhardness and microstructure results graphically. Inserts operation lifetime examined by comparing tempered inserts with nitrided inserts. Inserts lifetime expressed in the number of parts produced. Due to higher surface hardness of nitrided inserts 25 - 30 % more parts was made compared to tempered ones. Study showed that by using nitriding technology on inserts you can iprove production efficiency. |
| Dissertation Institution |
Kauno technologijos universitetas. |
| Type |
Master thesis |
| Language |
Lithuanian |
| Publication date |
2016 |
