Khetho ea hlobo e hloka ho finyella melao-motheo e meraro. Sebaka se finyella se hlokahalang mosebetsing oa ho apara ho hanyetsa, bothata, joalo-joalo. Sebaka se kopana le litlhoko tsa ts'ebetso, 'me hlobo e lokela ho finyella tlhoko ea moruo.
Folding condition requirements
1, roala ho hanyetsa
When the blank is plastically denatured in the mold cavity, it flows and slides along the surface of the cavity, causing severe friction between the surface of the cavity and the blank, which causes the mold to fail due to wear. Therefore, the wear resistance of the material is one of the most basic and important properties of the mold.
Hardness is a major factor affecting wear resistance. In general, the higher the hardness of the mold part, the smaller the wear amount, and the better the wear resistance. In addition, the wear resistance is also related to the type, quantity, shape, size and distribution of carbides in the material.
2. Mathata a matla
Most of the working conditions of the mold are very bad, and some often suffer from a large impact load, resulting in brittle fracture. In order to prevent the mold parts from suddenly breaking during work, the mold must have high strength and toughness.
The toughness of the mold depends mainly on the carbon content, grain size and microstructure of the material.
3. Fatigue fracture performance
Nakong ea ho sebetsa ha hlobo, tlas'a phello ea nako e telele ea khatello ea kelello, hangata mokhathala o fokolloa. Sebopeho se na le matla a mangata a matla a khatello ea mokhathala fracture, tensile mokhathala o fracture kopana le mokhathala fracture le bending mokhathala fracture.
Matlo a fatikaneng a fokolang a hlobo e itšetlehile haholo ka matla a eona, ho ba thata, ho thata, le ho ba le likhetho tse ling.
4. High temperature performance
Ha mocheso o sebetsang oa hlobo o phahame, boima le matla li theoha, e leng se hlahisoang ke ho apara pele ho hlobo kapa potion ea polasetiki le ho hlōleha. Ka hona, thepa ea mobu e lokela ho ba le botsitso bo phahameng ba ho loantša ho tiisa hore hlobo e na le boima bo matla le matla mocheso o sebetsang.
5. Resistance to cold and heat fatigue
Some molds are in a state of repeated heating and cooling during the working process, causing the surface of the cavity to be subjected to tensile and pressure-induced stresses, causing surface cracking and spalling, increasing friction, impeding plastic deformation, and reducing dimensional accuracy, thereby resulting in The mold failed. Hot and cold fatigue is one of the main forms of hot work die failure. It should have high resistance to cold and heat fatigue.
6. Ho hanyetsa ho bola
Some molds, such as plastic molds, when working, due to the presence of chlorine, fluorine and other elements in the plastic, after the heat, the HCI, HF and other strong aggressive gases are resolved, eroding the surface of the mold cavity, increasing its surface roughness and aggravating wear and tear.