koji je materijal najbolji za plijesan?

The kalup meets the requirements of working conditions

1. Otpornost na habanje

When the blank is plastically deformed in the mold cavity, teče i klizi duž površine kaviteta, uzrokujući nasilno trenje između površine šupljine i blanka, što uzrokuje kvar kalupa zbog habanja. Stoga, the wear resistance of the material is one of the most basic and important properties of the mold.

Tvrdoća je glavni faktor koji utiče na otpornost na habanje. Uglavnom, the higher the hardness of the mold parts, the smaller the amount of wear and the better the wear resistance. Osim toga, Otpornost na habanje također je povezana s tipom, quantity, oblik, veličina i raspored karbida u materijalu.

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. Performanse loma usled zamora

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, lom usled zamornog zatezanja, contact fatigue fracture, and bending fatigue fracture.

The fatigue fracture performance of the mold mainly depends on its strength, žilavost, tvrdoća, i sadržaj inkluzija u materijalu.

4. Performanse na visokim temperaturama

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. Otpornost na koroziju

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.

Sekunda、the mold meets the process performance requirements

Proizvodnja kalupa općenito uključuje nekoliko procesa kao što je kovanje, rezanje, i toplotnu obradu. Kako bi se osigurala kvaliteta izrade kalupa i smanjili troškovi proizvodnje, materijal treba da ima dobru sposobnost kovanja, obradivost, otvrdnjavanje, otvrdnjavanje i brušenje; it should also have small oxidation, decarburization sensitivity and quenching Deformation and cracking tendency.

1. Forgeability

Ima nisku otpornost na deformaciju toplog kovanja, dobra plastičnost, širok raspon temperatura kovanja, low tendency of forging cracking and cold cracking and precipitation of network carbides.

2. Obradivost žarenja

Raspon temperature sferoidizirajućeg žarenja je širok, tvrdoća žarenja je niska, raspon fluktuacije je mali, a stopa sferoidizacije je visoka.

3. Obradivost

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

4. Osetljivost na oksidaciju i dekarbonizaciju

Kada se zagrije na visokoj temperaturi, otpornost na oksidaciju je dobra, brzina dekarbonizacije je spora, it is not sensitive to the heating medium, and the tendency of pitting is small.

5. Kaljivost

Nakon gašenja, ima ujednačenu i visoku površinsku tvrdoću.

6. Kaljivost

Nakon gašenja, može se dobiti dublji očvrsnuti sloj, koji se može očvrsnuti upotrebom blagog medija za gašenje.

7. Sklonost kaljenja deformacija i pucanja

Konvencionalno gašenje ima malu promjenu zapremine, shape warping, slight distortion, i niska tendencija abnormalnih deformacija. 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. Nije osjetljiv na kvalitetu brusne ploče i uslove hlađenja, and it is not easy to cause abrasion and grinding cracks.

Treće, the mold meets the economic requirements

When selecting materijala for the kalup, the principle of economy must be considered to reduce the manufacturing cost as much as possible. Stoga, 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. Osim toga, 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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