GB/T 34027-2017 in English

Standard Overview and Scope of Application

This standard specifies cross-axis universal couplings with a swing diameter of 490mm~1320mm and a nominal torque of 800~16000kN·m, which are suitable for the connection between the rollers and the transmission shaft system of the hot strip mill. Torque transmission is achieved through the face gear flange, and the axis angle range is 5°~10°.

Core parameters and technical characteristics

Technical requirements for key components

1. Cross shaft manufacturing specifications

• Material: alloy steel forgings, Rm≥1200MPa
• Heat treatment: shaft neck carburizing layer 1.8-3.0mm, hardness 58-62HRC
• Geometric tolerance: coaxiality level 6, verticality level 7
• Detection: ultrasonic and magnetic particle inspection according to JB/T5000.15 level I

2. Bearing system requirements

Implementation suggestions

Main points for installation and commissioning

1. Ensure that the centers of the two universal joint forks are coplanar (deviation ≤0.5°)
2. Axial clearance is controlled at 0.1-0.15mm
3. The spline part is lubricated with No. 2 industrial lithium-based grease

Selection calculation formula

Calculated torque: T_c=K×T
Among which, the operating condition coefficient K value is:
Heavy impact load 2.5-3.5, reversible transmission 7-15

Technology evolution analysis

The main improvements of this standard compared with the old version are:

• The new integral roller side sleeve structure type
• Bearing clearance control is upgraded from P0 to O group
• Weld inspection standard is upgraded to GB/T11345 B level