quale materiale hè u megliu per u moldu?

U muffa meets the requirements of working conditions

1. Resistenza à l'usura

When the blank is plastically deformed in the mold cavity, scorri è scorri longu a superficia di a cavità, pruvucannu un attritu viulente trà a superficia di a cavità è u biancu, chì face chì u muffa fallisce per via di l'usura. Dunque, the wear resistance of the material is one of the most basic and important properties of the mold.

A durezza hè u fattore principale chì afecta a resistenza à l'usura. In generale, the higher the hardness of the mold parts, the smaller the amount of wear and the better the wear resistance. In più, a resistenza à l'usura hè ancu ligata à u tipu, quantity, forma, dimensione è distribuzione di carburi in u materiale.

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. Prestazione di frattura di fatigue

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, frattura da fatigue di trazione, contact fatigue fracture, and bending fatigue fracture.

The fatigue fracture performance of the mold mainly depends on its strength, durezza, durezza, è u cuntenutu di inclusi in u materiale.

4. Prestazione à alta temperatura

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. Resistenza à a corrosione

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.

Sicondu、the mold meets the process performance requirements

A fabricazione di stampi in generale implica parechji prucessi, cum'è a forgiatura, tagliu, è trattamentu termale. Per assicurà a qualità di a fabricazione di muffa è riduce i costi di produzzione, u materiale deve avè una bona forgeability, machinability, induribilità, temprabilità e macinabilità; it should also have small oxidation, decarburization sensitivity and quenching Deformation and cracking tendency.

1. Forgeability

Ha una bassa resistenza à a deformazione di forgiatura calda, bona plasticità, vasta gamma di temperature di forgiatura, low tendency of forging cracking and cold cracking and precipitation of network carbides.

2. Elaborabilità di ricucitura

U intervallu di temperatura di annealing spheroidizing hè largu, a durezza di annealing hè bassa, u intervalu di fluttuazione hè chjuca, è a rata di spheroidizing hè alta.

3. Machinability

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

4. Sensibilità à l'ossidazione è a decarburizazione

Quandu si riscalda à alta temperatura, a resistenza à l'ossidazione hè bona, a vitezza di decarburization hè lenta, it is not sensitive to the heating medium, and the tendency of pitting is small.

5. Induribilità

Dopu chìnching, hà una durezza di superficia uniforme è alta.

6. Induribilità

Dopu chìnching, si pò ottene una strata indurita più profonda, chì pò esse induritu cù l'usu di un medium quenching suave.

7. Tendenza à a deformazione di quenching è cracking

L'estinzione convenzionale hà un picculu cambiamentu di volume, shape warping, slight distortion, è bassa tendenza di deformazione anormali. Conventional quenching has low sensitivity to cracking, and is insensitive to quenching temperature and workpiece shape.

8. Grindability

The relative wear of the grinding wheel is small, and the limit of grinding without burn is large. Ùn hè micca sensibile à a qualità di a mola è e cundizioni di rinfrescamentu, and it is not easy to cause abrasion and grinding cracks.

Terzu, the mold meets the economic requirements

When selecting materiali for the muffa, the principle of economy must be considered to reduce the manufacturing cost as much as possible. Dunque, 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. In più, 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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