quin material és el millor per al motlle?

El motlle meets the requirements of working conditions

1. Resistència al desgast

When the blank is plastically deformed in the mold cavity, flueix i llisca per la superfície de la cavitat, provocant una fricció violenta entre la superfície de la cavitat i el blanc, que fa que el motlle falli per desgast. Per tant, the wear resistance of the material is one of the most basic and important properties of the mold.

Hardness is the main factor affecting wear resistance. En general, the higher the hardness of the mold parts, the smaller the amount of wear and the better the wear resistance. A més, wear resistance is also related to the type, quantity, forma, size and distribution of carbides in the material.

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. Fatigue fracture performance

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, tensile fatigue fracture, contact fatigue fracture, and bending fatigue fracture.

The fatigue fracture performance of the mold mainly depends on its strength, toughness, hardness, and the content of inclusions in the material.

4. High temperature performance

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. Corrosion resistance

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.

Segon、the mold meets the process performance requirements

La fabricació de motlles en general implica diversos processos com la forja, tall, i tractament tèrmic. Per tal de garantir la qualitat de la fabricació de motlles i reduir els costos de producció, el material ha de tenir una bona forjabilitat, mecanització, enduribilitat, enduriment i mòlta; it should also have small oxidation, decarburization sensitivity and quenching Deformation and cracking tendency.

1. Forjabilitat

Té una baixa resistència a la deformació de forja en calent, bona plasticitat, ampli rang de temperatures de forja, low tendency of forging cracking and cold cracking and precipitation of network carbides.

2. Processabilitat de recuit

El rang de temperatures de recuit esferoïdal és ampli, la duresa de recuit és baixa, el rang de fluctuació és petit, i la taxa d'esferoidització és alta.

3. Mecanització

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

4. Sensibilitat a l'oxidació i descarburació

Quan s'escalfa a alta temperatura, la resistència a l'oxidació és bona, la velocitat de descarburació és lenta, it is not sensitive to the heating medium, and the tendency of pitting is small.

5. Enduribilitat

Després d'apagar, té una duresa superficial uniforme i alta.

6. Enduribilitat

Després d'apagar, es pot obtenir una capa més endurida, que es pot endurir mitjançant l'ús d'un mitjà d'extinció suau.

7. Tendència de deformació i esquerdament

L'extinció convencional té un petit canvi de volum, shape warping, slight distortion, i baixa tendència de deformació anormal. Conventional quenching has low sensitivity to cracking, and is insensitive to quenching temperature and workpiece shape.

8. Mòlta

The relative wear of the grinding wheel is small, and the limit of grinding without burn is large. No és sensible a la qualitat de la mola i a les condicions de refrigeració, and it is not easy to cause abrasion and grinding cracks.

Tercer, the mold meets the economic requirements

When selecting materials for the motlle, the principle of economy must be considered to reduce the manufacturing cost as much as possible. Per tant, 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. A més, 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.

Si teniu alguna pregunta sobre indústria del plàstic,si us plau, no dubteu a preguntar Equip FLYSE,et donarem el millor servei!

WhatsApp / Wechat 008618958305290