用火烧或火烤来除去固在螺杆上的塑料，是塑料加工单位最常见也是最有效的办法，但绝对不能使用乙炔焰来清洁螺杆。乙炔焰温度可达3000°C，用乙炔焰来清洁请洁螺杆将不仅会破坏螺杆的金属特性，同时还将显著影响螺杆的机械公差。如果乙炔焰在烘烤螺杆某部位时火焰变为持久的蓝色，那么意味着螺杆这一部位的金属结构发生了改变，这将导致该部位耐磨损性降低，甚至发生抗磨损层与基体金属剥离。另外采用乙炔焰局部加热也会造成螺杆一侧过热，从而导致螺杆弯曲。大多数螺杆采用4140HT钢制造，公差十分紧密，一般在0.03mm以内。螺杆的平直度大多在0.01mm以内，当螺杆经乙炔焰烘烤及冷却后，通常很难回到原始的平直度。正确有效办法：在螺杆使用后立即采用喷灯进行清洁。因为这时螺杆带有加工过程中的热，故螺杆的热量分布仍是均匀的。

It is the most common and effective way for plastic processing units to remove the plastic fixed on the screw by burning or roasting, but acetylene flame must not be used to clean the screw. The temperature of acetylene flame can reach 3000 C. Cleaning the screw with acetylene flame will not only destroy the metal characteristics of the screw, but also significantly affect the mechanical tolerance omojulj.37ix.com.cnpeidianfb.37ix.com.cnweilan.37ix.com.cntuoliutacc.37ix.com.cnjiaqiaob.37ix.com.cnchu

weiji.37ix.com.cnf the screw. If the flame of acetylene flame becomes persistent blue when roasting a part of the screw, it means that the metal structure of this part of the screw has changed, which will lead to the reduction of wear resistance of this part, and even the abrasion resistance layer and matrix metal peeling. In addition, local heating with acetylene flame can also cause overheating on one side of the screw, leading to screw bending. Most of the screw rods are made of 4140HT steel, and the tolerance is very close, generally within 0.03mm. The flatness of the screw is mostly within 0.01 mm. When the screw is baked and cooled by acetylene flame, it is usually difficult to return to the original flatness. Correct and effective method: use blowtorch to clean the screw immediately after use. Because the screw has heat in the process of processing, the heat distribution of the screw is still uniform.