hvaða efni er best fyrir myglu?

The mygla meets the requirements of working conditions

1. Slitþol

When the blank is plastically deformed in the moldhola, það rennur og rennur eftir yfirborði holrúmsins, sem veldur miklum núningi milli yfirborðs holrúmsins og eyðublaðsins, sem veldur því að myglan bilar vegna slits. Þess vegna, the wear resistance of the material is one of the most basic and important properties of the mold.

Hörku er aðalþátturinn sem hefur áhrif á slitþol. Almennt, the higher the hardness of the mold parts, the smaller the amount of wear and the better the wear resistance. Auk þess, slitþol tengist líka gerðinni, quantity, lögun, stærð og dreifing karbíða í efninu.

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. Frammistaða þreytubrota

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, togþreytubrot, contact fatigue fracture, and bending fatigue fracture.

The fatigue fracture performance of the mold mainly depends on its strength, hörku, hörku, og innihald innfellinga í efninu.

4. Afköst við háan hita

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. Tæringarþol

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.

Í öðru lagi、the mold meets the process performance requirements

Framleiðsla á mótum felur almennt í sér nokkra ferla eins og smíða, klippa, og hitameðferð. Til að tryggja gæði moldframleiðslu og draga úr framleiðslukostnaði, efnið ætti að hafa góða smíðagetu, vélhæfni, harðni, harðni og malanleiki; it should also have small oxidation, decarburization sensitivity and quenching Deformation and cracking tendency.

1. Fölsunarhæfni

Það hefur lítið heitt mótunaraflögunarþol, góð mýkt, breitt smíðahitasvið, low tendency of forging cracking and cold cracking and precipitation of network carbides.

2. Vinnsluhæfni glæðingar

Hitastigssvið kúluglæðingar er breitt, glæðingarhörkan er lág, sveiflubilið er lítið, og kúluvæðingarhraði er hátt.

3. Vinnanleiki

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

4. Næmi fyrir oxun og afkolun

Þegar hitað er við háan hita, oxunarþolið er gott, afkolunarhraði er hægur, it is not sensitive to the heating medium, and the tendency of pitting is small.

5. Harðnandi

Eftir slökun, það hefur einsleita og mikla yfirborðshörku.

6. Harðnandi

Eftir slökun, hægt er að fá dýpra hert lag, sem hægt er að herða með því að nota mildan slökkviefni.

7. Tilhneiging til að slökkva aflögun og sprungur

Hefðbundin slökkvun hefur litla rúmmálsbreytingu, shape warping, slight distortion, og lítil tilhneiging til óeðlilegrar aflögunar. Conventional quenching has low sensitivity to cracking, and is insensitive to quenching temperature and workpiece shape.

8. Slípandi

The relative wear of the grinding wheel is small, and the limit of grinding without burn is large. Það er ekki viðkvæmt fyrir gæðum slípihjólsins og kæliskilyrðum, and it is not easy to cause abrasion and grinding cracks.

Í þriðja lagi, the mold meets the economic requirements

When selecting efni for the mygla, the principle of economy must be considered to reduce the manufacturing cost as much as possible. Þess vegna, 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. Auk þess, 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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