How much do you know about linear rod bearing?

The linear rod bearing is a product that has the guiding function of a sliding bearing and enables linear motion. The necessary conditions required by these linear motion systems are: simple design, best execution ability, low maintenance costs, use of rigorous selection of durable materials, high frequency heat treatment, accurate outer diameter dimensions, roundness, straightness And surface treatment.
1. Ordinary linear rod bearing (sf): Since the ordinary linear rod bearing is in point-to-face contact with the linear bearing, the surface hardness of the ordinary linear optical axis is very high, so the material and heat treatment method are very important. Material: suj2 (equivalent) national standard gcr15. Hardness: hrc60 ± 2; Hardened layer depth: 0.8-3mm; Surface roughness: ra0.10m-ra0.35m; Straightness: 70um / 1000mm or less; Shaft outer diameter tolerance g6

2, chrome-plated linear rod bearing (sfc): The chrome-plated linear rod bearing is a layer of hard chrome plated on the basis of the ordinary linear optical axis, also known as a bearing rod, which can be used in environments that are prone to rust or in bad environments. It is widely used in industrial robots and moving parts of automatic sliding system devices.

Optical axis
: Suj2 (equivalent) national standard gcr15. Hardness: hrc60 ± 2; Hardened layer depth: 0.8-3mm; Surface roughness: ra0.10m-ra0.35m straightness material
3, chrome-plated linear flexible shaft (rsfc): The chrome-plated linear flexible shaft can be directly used for precision piston rods and some self-lubricating bearings due to its thick chrome plating layer. Because of its moderate hardness, it is used in many fields. Material: 45 # or 40cr or 2cr13; Hardness: hb220-260; Hardened layer depth: 0.8-3mm; Straightness: 0.15mm / 1000mm or less; Chrome plating thickness: 0.02-0.05mm

4.Stainless steel linear rod bearing: Stainless steel linear rod bearing has high corrosion resistance, high strength and wear resistance to maintain its efficient running performance. Therefore, it can be used in places where oxidation is prone to occur, such as water, chemicals, steam, seawater, etc. Material: sus404c, sus304 hardness: hrc60 ± 2; depth of hardened layer: 0.8-3mm; surface roughness: ra0.10m-ra0.35m straightness
5, chrome-plated hollow shaft: Due to the characteristics of its hollow structure, the chrome-plated hollow shaft greatly reduces the weight and simplifies the structure. Its interior is suitable for penetrating the measuring wire, compressing air, adding lubricating oil, or For robotic arms.

Application of linear rod bearing
linear rod bearing are widely used in many linear motion systems such as cylinder rods, automatic precision printers, automatic cutting machines and industrial robots.

Classification of axes
There are three kinds of common shafts: crankshaft, straight shaft and flexible shaft.
Straight shafts can be divided into: ①Rotary shafts, which bear both bending moment and torque during work, are the most common shafts in machinery, such as shafts in various reducers. ② Mandrels are used to support rotating parts that only bear the bending moment without transmitting torque. Some mandrels rotate, such as the axles of railway vehicles, and some mandrels do not rotate, such as the shafts supporting pulleys. ③ The drive shaft is mainly used to transmit torque without bearing bending moments, such as the linear rod bearing in the crane moving mechanism, the drive shaft of the car, etc. The material of the shaft is mainly carbon steel or alloy steel, and ductile iron or alloy cast iron can also be used. The working capacity of the shaft generally depends on the strength and stiffness, and when the speed is high, it also depends on the vibration stability.

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