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不锈钢表面处理加强钣金加工性能

2018-06-14 11:43:39 常州亿创钣金加工厂 阅读

不锈钢加热时也要构成氧化皮,尽管没有碳钢锻件上的氧化皮厚,但与基体金属的粘附力强且很坚固,使模具和刃具很快磨损。因而,在制坯和终锻之间,在机械加工之前,均须将氧化皮铲除洁净。酸洗和喷砂都是较好的整理办法,以锻件先经酸洗再进行喷砂的办法效果最佳。  
When the stainless steel is heated, the oxide skin is also formed. Although there is no thick oxidation leather on the carbon steel forgings, the adhesive force with the matrix metal is strong and strong, so that the die and the cutting tools are quickly worn. Therefore, before the machining process, the oxide scale must be removed from the billet and the final forging. Pickling and sandblasting are good finishing methods. The best way is to wash the forgings first and then do sandblasting. 

1.喷砂   

喷砂整理设备(喷砂机)是选用压缩空气为动力,以构成高速喷发束将喷料(喷丸玻璃珠、钢丸、钢砂、石英砂、金刚砂、铁砂、海砂)高速喷发到被需处置工件外表,激光切开机激光切开设备铸铁渠道使工件外表的外外表的机械性能发作变化,因为磨料对工件外表的冲击和切削效果,使工件的外表获的必定的清洁度和不一样的粗糙度,使工件外表的机械性能得到改进,因而进步了工件的抗疲劳性,增加了它和涂层之间的附着力

1. sandblasting

Sand spray finishing equipment (sandblasting machine) is the use of compressed air to form a high-speed jet beam (shot peening glass beads, steel balls, steel sand, quartz sand, emery sand, iron sand, sand) to the surface of the required disposal work pieces, laser cutting machine laser cutting equipment cast iron channels to make the exterior exterior appearance of the workpiece Mechanical performance changes, because of the impact and cutting effect of the abrasive to the surface of the workpiece, make the workpiece's appearance of a certain degree of cleanliness and roughness, and improve the mechanical properties of the workpiece surface, thus improving the fatigue resistance of the workpiece and increasing the adhesion between the workpiece and the coating.

2.酸洗 酸洗通常指清洁金属外表的一种办法。

  通常将制件浸入硫酸等的水溶液,以除掉金属外表的氧化物等薄膜。是电镀、珐琅、轧制等技术的前处置或中心处置。   

(一)运用酸溶液去掉钢铁外表上的氧化皮和锈蚀物的办法称为酸洗。氧化皮、铁锈等铁的氧化物(Fe3O4,Fe2O3,FeO等)与酸溶液发作化学反应,构成盐类溶于酸溶液中而被除掉。酸洗用酸有硫酸、盐酸、磷酸、硝酸、铬酸、氢氟酸和混合酸等。最常用的是硫酸和盐酸。酸洗技术主要有浸渍酸洗法、喷发酸洗法和酸膏除锈法。通常多用浸渍酸洗法,大批量生产中可选用喷发法。钢铁零件通常在10%~20%(体积)硫酸溶液中酸洗,温度为40℃。   当溶液中含铁量超越80g/L,硫酸亚铁超越215g/L时,应替换酸洗液。常温下,用20%~80%(体积)的盐酸溶液对钢铁进行酸洗,不易发作过腐蚀和氢脆表象。因为酸对金属的腐蚀效果很大,需求增加缓蚀剂。清洁后金属外表成银白色,一起钝化外表,进步不锈钢抗腐蚀才能。   

(二)为了消除硅藻土载体外表吸附,削减色谱峰拖尾,载体在运用前需进行酸洗或碱洗处置。酸洗是把载体用6mol/L盐酸浸煮2h或浓盐酸加热浸煮30min,过滤,用水洗至中性,烘干。酸洗可除掉外表上的铁、铝、钙、镁等杂质,但不能除掉硅醇基。酸洗载体适宜于剖析酸性样品。

2. pickling and pickling usually means cleaning the appearance of metal.

Usually the products are immersed in sulfuric acid and other aqueous solutions to remove the oxide film from the metal surface. It is the pre disposal or central disposal of electroplating, enamel and rolling technology.

(1) the use of acid solution to remove the oxide scale and rust on the surface of steel is called pickling. Iron oxides (Fe3O4, Fe2O3, FeO, etc.), such as oxide scales and rust, react with acid solutions to form salts and dissolve them in acid solutions. Acid for pickling is sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, chromic acid, hydrofluoric acid and mixed acid. Sulphuric acid and hydrochloric acid are the most commonly used. The pickling technology mainly consists of pickling acid washing, acid washing and acid removing. Usually, the method of impregnating acid is often used, and the method of eruption can be used in mass production. Iron and steel parts are usually pickled in 10% to 20% (volume) sulfuric acid solution at a temperature of 40 degrees Celsius. When the iron content in solution exceeds 80g/L, ferrous sulfate exceeds 215g/L, replace acid pickling solution. At room temperature, 20% ~ 80% (volume) of hydrochloric acid is used to pickle steel, which is not easy to attack corrosion and hydrogen embrittlement. Because acid has great corrosion effect on metals, corrosion inhibitors are needed. After cleaning, the metal is silvery white and passivated to improve the corrosion resistance of stainless steel.

(two) in order to eliminate the adsorption on the surface of diatomite carrier and reduce the peak tailing of color spectrum, the carrier should be treated by acid washing or caustic washing before application. Pickling is to carry the carrier with 6mol/L hydrochloric acid to boil 2H or concentrated hydrochloric acid to heat to dip and boil 30min, filtering, washing with water to neutral, drying.  Pickling can remove impurities such as iron, aluminum, calcium, magnesium and so on, but can not remove silanol. Acid pickling is suitable for the analysis of acid samples.



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