在對軋鋼刀片進行鍛造時，需有適當(dāng)?shù)膲嚎s比，使鋼中的碳化物細(xì)化并使之分布均勻，保證鋼中網(wǎng)狀碳化物大部分被破碎。鍛造過程中，應(yīng)該注意這兩點：終鍛溫度過高，鍛后易形成碳化物網(wǎng)，終鍛溫度過低，鋼的塑性變壞，易生成小裂紋。
退火是為了使?jié)B碳體呈球狀并均勻分布，球化退火的加熱溫度范圍一般為730～800℃。加熱過程中一部分滲碳體溶于奧氏體，殘留的滲碳體自發(fā)地趨于球形以減小表面能。隨后的緩慢冷卻過程中繼續(xù)析出的滲碳體也接近球狀，因而獲得細(xì)而均勻分布的球狀珠光體。
碳鋼的軋鋼刀片正常淬火加熱溫度為Ac1+30-50℃，屬于不完全淬火。在淬火溫度升高時，最初，強度和塑性有些提高，但當(dāng)淬火溫度超過一定限度后，強度及塑性都迅速下降。制造軋鋼刀片需要有一個最佳淬火溫度，超過這個淬火溫度，其強度和塑性都明顯下降。
軋鋼刀片淬火后應(yīng)立即回火。回火溫度因刀片的種類與用途而稍有差異。平刃通常采用180～210℃，異形刀片采用200～250℃的爐溫進行回火。
碳鋼的化學(xué)成分：一般情況下，含碳量越高的鋼材耐磨性越好，而韌性越差。為了使軋鋼刀片有足夠高的硬度及較好的耐磨性，使用的碳鋼一般含碳量為0.65-1.35%C。隨著鋼材牌號的數(shù)字的升高，鋼的硬度與耐磨性增高，而韌性逐漸下降。常用的碳鋼有T7、T8、T9、T10、T11、T12及T13等等。在碳素工具鋼中，錳含量過高會使鋼的韌性下降，不過，含有少量（0.35-0.60%）的可提高鋼的淬透性； 硅可提高鋼的淬透性，而硫、磷等化學(xué)元素對鋼材有害，應(yīng)嚴(yán)格控制其含量。
本文由金屬剪切機、廢鋼打包機廠家江陰市鳴澄液壓機械有限公司整理提供，更多資訊請訪問：tongchuangbio.com
On rolling blade forging, needs to have proper compression ratio, the carbides in the steel refinement and uniform distribution, ensure that most of the carbide network in steel was broken. Forging process, should pay attention to these two points: the final forging temperature is too high, easy to form carbide network after forging, finish forging temperature is too low, steel plastic deteriorate, breeds into small cracks.
Annealing is to make cementite spherical and uniform distribution, the spheroidizing annealing temperature range is generally 730 ~ 800 ℃. Part of cementite in the heating process in austenite, the remaining cementite tend to spontaneously spherical to reduce the surface energy. Then continue to precipitate in the process of slow cooling of the cementite is close to the ball, thus obtain fine and uniform distribution of spheroidal pearlite.
Carbon steel rolling blade quenching heating temperature for normal Ac1 + 30-50 ℃, belong to incomplete hardening. When quenching temperature, at first, some improve the strength and plasticity, but exceed certain limit when the quenching temperature, strength and plasticity are falling fast. Manufacturing of steel rolling blade needs to have a best quenching temperature, more than the quenching temperature, the strength and plasticity are markedly reduced.
For steelrolling should immediately after quenching tempering. Tempering temperature is slightly different because of the kinds and application of the blade. Flat blade usually adopt 180 ~ 210 ℃, special-shaped blade USES the tempering temperature of 200 ~ 250 ℃.
The chemical composition of carbon steel: in general, the higher the carbon content of steel, wear resistance, the better the toughness, the worse. In order to make the steel rolling blade have enough high hardness and good wear resistance, the use of carbon steel in general carbon content is 0.65-1.35% C. With the increase of steel grade of digital, higher hardness and wear resistance of steel, and tough gradually decline. Common carbon steel with T7 has, T8, T9, and T10, T11, T12 and T13 and so on. In carbon tool steel, high manganese content can reduce the toughness of the steel, however, contains a small amount (0.35 0.60%) can improve the hardenability of steel; Silicon can improve the hardenability of steel, and the chemical elements such as sulphur, phosphorus is harmful to the steel, should be strictly control its content.
