What Material Is Used For Ball Screw

According to the function of the ball screw in the machine, the requirements for accuracy and the size of the load, it can be divided into ordinary screw (the precision of the trapezoidal screw is 7~9, and the ball screw is D~H) and the precision screw. screw (the precision of the lead screw is grade 6). All kinds of high-quality titanium lead screws are selected, professional quality assurance, because professional, so excellent! According to their heat treatment conditions, they can be divided into two types: hard lead screws and soft lead screws.

First of all, it is necessary to strictly check the acceptance of raw materials, especially to check item by item according to national standards, especially the surface quality of raw materials (mainly the appearance, shape and surface defects of raw materials), chemical composition inspection and internal quality (that is, internal organization defects, such as Looseness, slag inclusion, segregation, decarburization, etc.), can be put into production only after qualified.

Soft lead screws with general accuracy are widely used, such as 7-8 level positioning leadscrews on machine tools, manual feed leadscrews, etc. Due to their convenient processing and low manufacturing cost, the performance requirements of the materials used are not high. It is mostly used in some medium carbon steels and medium carbon low alloy steels.

For the precision soft lead screw, the precision lead screw with the precision above grade 6 and the hardness below 35HRC is mostly used in the structure of light load, low frequency and good lubrication. For steels with high carbon content such as T10A and T12A, their requirements for materials, in addition to the conditions similar to ordinary precision soft lead screws, have low sensitivity to the grinding performance of the material, the surface of the coke is not easy to wear, and the susceptibility to wear cracking is low. , Grinding surface roughness is low.

The precision hard screw requires a certain strength and toughness for the core, and the raceway has a high hardness (generally 58~63HRC) to ensure sufficient bearing capacity and can drive a heavy load for free precision. Movement, which requires the tensile strength of the material to reach 700~1000Mpa, and it should also have a certain toughness and precision. The workpiece needs to have a large load for free and precise movement during the manufacturing process. This requires that the tensile strength of the material reach 700~1000Mpa, and it should also have certain toughness and precision. The workpiece must have a good cold and hot processing technology during the manufacturing process.

Lead screw material.

①General accuracy (referring to grade 7~9) For light-loaded medium carbon steel (such as 45, 50 steel) commonly used lead screws (such as 45 steel, 50 steel), normalizing, quenching and tempering treatment or cold-rolled free cutting Steel (such as Y45MnV) is directly machined. The produced 45Cr, 40Cr and other non-alloy steels can be selected as quenched and tempered structural steels that have requirements on wear resistance, and can be used directly after nitrocarburizing treatment. For the lead screw with less force for measurement, quenched and tempered non-alloy structural steel (such as 45Cr, 40Cr steel) can be selected, and surface quenching is carried out after induction heating.

②High-precision (referring to grade 6 or above) lead screws are quenched and tempered or spheroidized annealed for ordinary non-alloy (carbon) or low-alloy tool steel (such as T10A, T12A or 9Mn2V, CrWMn steel). Commonly used low alloy tool steel (such as 9Mn2V, CrWMn steel) and overall quenching, can also be used for nitriding special steel (such as 38CrMoA1A, 35CrMo steel) manufacturing and nitriding treatment, used to withstand high temperature environment. Small-sized lead screws that require high wear resistance can be made of carburized low-alloy steel (such as 20CrMnTi steel) by carburizing + quenching + low temperature tempering. The lead screw for high temperature work can be produced by precipitation hardening stainless steel (such as 0Cr17Ni4Cu4Nb), and used after solution + aging treatment.

Ball screw material.

①Low-precision, light-load ball screws can choose non-alloy (carbon) structural steel (such as 45 steel, 50 steel), after normalizing, quenching and tempering; there are also some optional cold-rolled forming steel (such as 60 steel) )Use directly.

②High-precision, heavy-duty ball screws are mostly made of low-alloy tool steel (such as 9Mn2V, CrWMn steel) and rolling bearing steel (such as GCr15, GCr15SiMn steel), which can be surface quenched by induction heating, or flame heated or integrally quenched.

③Small-sized ball screws are habitually selected carburized steel (such as 20CrMnTi steel), which is carburized + quenched + low temperature tempering.

④For high-precision ball screws that are prone to deformation during heat treatment, special nitrided steel (such as 38CrMoA1A steel) can be selected and treated with nitriding.

⑤The ball screw working in corrosive and high temperature environment can choose precipitation hardening stainless steel (such as 1Cr15Co14Mo5VN, 0Cr17Ni4Cu4Nb steel), which is used after solution treatment + aging treatment.

Materials for ball screws and rewinders.

①The ball nut is mainly made of low-alloy cutting tool steel (such as GCr15, CrWMn steel), which is used after overall quenching (hardness of 60~62HRC).

②GCr15, CrWMn, 20CrMnTi, 40CrMo, 40CrMo, 40Cr, 40Cr, etc., after the overall quenching, the hardness is 58HRC, the ion nitriding (the depth of the nitriding layer is 0.3~0.4mm), and the hardness is 500~550HV, depending on the steel type.

Generally, GCr15 bearing steel GCr15 is used, and GCr15SiMn is used for screw pairs with high requirements, including nuts, screws, beads, etc. (See GB/T18254-2002 High Carbon Chromium Bearing Steel)

The former content is 0.15%~0.35%, Mn content is 0.25%~0.45%; the latter is 0.45%~0.45%, Mn content is 0.45%~0.75%, Mn content is 0.95%~1.25%.