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De forma meets the requirements of working conditions

1. Slitstyrka

When the blank is plastically deformed in the mold cavity, det flyter och glider längs med ytan av kaviteten, orsakar våldsam friktion mellan kavitetens yta och ämnet, vilket gör att formen går sönder på grund av slitage. Därför, the wear resistance of the material is one of the most basic and important properties of the mold.

Hårdhet är den viktigaste faktorn som påverkar slitstyrkan. I allmänhet, the higher the hardness of the mold parts, the smaller the amount of wear and the better the wear resistance. Dessutom, slitstyrkan är också relaterad till typen, quantity, form, storlek och fördelning av karbider i materialet.

2. Strength

The working conditions of the molds are mostly very bad, and some of them are often subjected to large impact loads, which leads to brittle fracture. In order to prevent sudden brittle fracture of mold parts during work, the mold must have high strength and toughness.

The toughness of the mold mainly depends on the carbon content, grain size and organization state of the material.

3. Utmattningsfrakturprestanda

In the process of mold work, under the long-term action of cyclic stress, fatigue fracture is often caused. Its forms include low-energy multiple impact fatigue fracture, dragutmattningsbrott, contact fatigue fracture, and bending fatigue fracture.

The fatigue fracture performance of the mold mainly depends on its strength, seghet, hårdhet, och innehållet av inneslutningar i materialet.

4. Hög temperatur prestanda

When the working temperature of the mold is higher, the hardness and strength will decrease, leading to early wear of the mold or plastic deformation and failure. Because the mold material should have high anti-tempering stability, to ensure that the mold has a high hardness and strength at the working temperature.

5. Resistance to cold and heat fatigue

Some molds are in a state of repeated heating and cooling during the working process, which causes the surface of the cavity to be pulled and pressure to change the stress, causing surface cracks and peeling, increasing friction, hindering plastic deformation, and reducing dimensional accuracy. Mold failure. Heat and cold fatigue is one of the main forms of failure of hot work molds, and this type of mold should have high resistance to cold and heat fatigue.

6. Korrosionsbeständighet

When some molds such as plastic molds are working, due to the presence of chlorine, fluorine and other elements in the plastics, strong corrosive gases such as hci and hf will be resolved after being heated, which will erode the surface of the mold cavity, increase its surface roughness, and aggravate wear failure.

Andra、the mold meets the process performance requirements

Tillverkningen av formar involverar i allmänhet flera processer såsom smide, skärande, och värmebehandling. För att säkerställa kvaliteten på formtillverkningen och minska produktionskostnaderna, materialet ska ha god smidbarhet, bearbetbarhet, härdbarhet, härdbarhet och slipbarhet; it should also have small oxidation, decarburization sensitivity and quenching Deformation and cracking tendency.

1. Smidbarhet

Den har lågt motstånd mot deformation av varmsmide, bra plasticitet, brett smidestemperaturområde, low tendency of forging cracking and cold cracking and precipitation of network carbides.

2. Glödgningsbearbetbarhet

Det sfäroidiserande glödgningstemperaturområdet är brett, glödgningshårdheten är låg, fluktuationsintervallet är litet, och sfäroidiseringshastigheten är hög.

3. Bearbetningsbarhet

The cutting amount is large, the tool loss is low, and the machined surface roughness is low.

4. Känslighet för oxidation och avkolning

Vid uppvärmning vid hög temperatur, oxidationsbeständigheten är god, avkolningshastigheten är låg, it is not sensitive to the heating medium, and the tendency of pitting is small.

5. Härdbarhet

Efter släckning, den har jämn och hög ythårdhet.

6. Härdbarhet

Efter släckning, ett djupare härdat lager kan erhållas, som kan härdas genom att använda ett milt kylmedel.

7. Tendens till släckningsdeformation och sprickbildning

Konventionell härdning har liten volymförändring, shape warping, slight distortion, och låg tendens till onormal deformation. Conventional quenching has low sensitivity to cracking, and is insensitive to quenching temperature and workpiece shape.

8. Slipbarhet

The relative wear of the grinding wheel is small, and the limit of grinding without burn is large. Den är inte känslig för kvaliteten på slipskivan och kylförhållandena, and it is not easy to cause abrasion and grinding cracks.

Tredje, the mold meets the economic requirements

When selecting material for the forma, the principle of economy must be considered to reduce the manufacturing cost as much as possible. Därför, under the premise of satisfying the performance, first choose the lower price, carbon steel can be used without alloy steel, and domestic materials can be used without imported materials. Dessutom, the production and supply of the market should also be considered when selecting materials. The selected steel grades should be as few and concentrated as possible .

The injection molding process conditions have an impact on the appearance and mechanical properties of plastic products. Each process condition parameter affects each other and is not independent. The defects of some products are the result of mutual influence.

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