What is a nylon screw?
High precision professional nylon screw is a mechanical component made of special nylon material and processed through high-precision manufacturing technology. It is mainly used in situations with high requirements such as precise transmission and position control.
Advantages of nylon screw
High strength and toughness.With high mechanical strength and good toughness, it has high tensile and compressive strength, higher tensile strength than metals, and comparable compressive strength to metals. It can withstand large external forces and pressures without easily breaking, and can meet the requirements of various complex working conditions.
Strong fatigue resistance.Outstanding fatigue resistance, the component can maintain its original mechanical strength even after repeated bending, and can still work stably under long-term cyclic loads, extending its service life.
Limitations of nylon screw
Insufficient mechanical strength.Although nylon has high strength and toughness, its mechanical strength is still relatively low compared to metal materials. When subjected to large tensile, compressive, or impact forces, nylon screws may experience problems such as fracture and deformation, making them unsuitable for heavy machinery or high load working environments that require extremely high mechanical strength.
Poor acid resistance.Nylon screws have a certain sensitivity to strong acids. When in contact with strong acid substances, they are prone to chemical reactions, which can cause corrosion and damage to the surface of the screw, thereby affecting its accuracy and mechanical properties, shortening its service life. Therefore, their application will be limited in some acidic working environments.
The main function of the nylon screw
It can achieve precise transmission and control, ensuring the accuracy of displacement and speed; Excellent performance in material conveying and measurement, ensuring uniform conveying and accurate measurement; Efficient transmission and conversion of force, achieving torque transmission and amplification/reduction of force; It can also serve as a connecting and positioning component, ensuring the reliability and precise positioning of mechanical structures.
The working principle of the nylon screw
Material conveying is achieved through rotational pushing and friction; Promote material plasticization through shear and compression effects; Use stirring to achieve material mixing.
There are various types of nylon screw , how to choose the one that suits you
一、Equipment compatibility
1.Adaptation to injection molding machines or extruders. The diameter, length, and other dimensions of the screw should match the size of the equipment barrel to ensure proper installation and smooth operation. At the same time, the torque, speed and other parameters of the screw should also be matched with the power system of the equipment to fully utilize its performance.
2.Adaptation to the mold. The design of the mold’s sprue and the size of the runner can also affect the selection of the screw. For example, molds with smaller gates may require screws with better measurement accuracy and plasticizing effect to ensure that the material can be evenly filled into the mold cavity.
二、Service life and maintenance cost
1.Wear resistance. The wear resistance of a screw directly affects its service life, especially under working conditions of high speed, high load, or frequent reciprocating motion. Choosing nylon materials with good wear resistance and appropriate surface treatment methods can effectively extend the service life of screws, reduce replacement frequency and maintenance costs.
2.Fatigue strength. Under dynamic loads, the fatigue strength of the screw is an important consideration factor. If the fatigue strength of the screw is insufficient, premature fatigue failure may occur during operation, affecting the normal operation of the equipment. Therefore, it is necessary to choose screw materials with high fatigue strength and reasonable structural design to ensure their reliability during their service life.
3.Maintenance requirements. Different screws require different maintenance measures during use, such as regular lubrication, cleaning, inspection, etc. Some complex or high-precision screws may require stricter maintenance requirements and professional maintenance equipment, which will increase maintenance costs and workload. Therefore, when choosing screws, it is necessary to consider the difficulty and cost of maintenance, and choose products that are suitable for one’s own maintenance capabilities and cost budget.
三、Transmission efficiency
1.Thread type and helix angle. Different thread types and helix angles can affect the transmission efficiency of the screw. Generally speaking, the transmission efficiency of trapezoidal and serrated threads is relatively high, while ordinary threads have better self-locking performance but relatively lower transmission efficiency. When choosing, it is necessary to determine the thread type and helix angle based on specific transmission requirements and whether self-locking function is needed.
2.Lubrication and friction coefficient. Good lubrication can reduce the friction coefficient between the screw and nut, improve transmission efficiency, reduce wear and energy loss. Therefore, when selecting a screw, it is necessary to consider its lubrication method and lubrication conditions, and choose the appropriate lubricant. Meanwhile, some nylon screws that have undergone special surface treatment or added lubricants can improve their self-lubricating performance and transmission efficiency to a certain extent.
3.Coordination accuracy and clearance. The coordination accuracy and clearance between the screw and nut can also affect the transmission efficiency. A smaller clearance can improve the accuracy and efficiency of transmission, but it also increases the difficulty of manufacturing and assembly. Therefore, it is necessary to reasonably choose the fitting accuracy and clearance while ensuring the transmission efficiency, in order to balance the manufacturing and usage costs
四、Load capacity
1.Axial load. It is necessary to consider the magnitude of the axial force that the screw is subjected to during operation, and select appropriate parameters such as screw diameter, pitch, and thread profile based on the magnitude of the load. Generally speaking, larger screw diameters and pitches can withstand greater axial loads, but they also increase the volume and weight of the screw.
2.Radial load. In addition to axial load, it is also necessary to consider the radial force that the screw may bear, such as in some inclined installations or under lateral force. For screws that bear large radial loads, it is necessary to choose a structural form with good radial bearing capacity or add corresponding support devices.
3.Dynamic load. If the screw operates under frequent start stop, variable speed, or impact load conditions, its dynamic load capacity also needs to be considered. At this point, factors such as the material fatigue strength of the screw, the meshing performance of the thread, and the reliability of the connection part become particularly important, and it is necessary to choose screw products with high dynamic load capacity.