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straightening roller is larger than 75% of the length of roller
body regulated by national standard (JB/T 3163–1999 the
Technical Condition for the Oblique Roller Tubes
Straightening Machine). Therefore, the pressing force
applied to the tube by the upper and lower roller can be
considered as uniformly distributed force. The force
analysis is shown in Fig. 3, which can be pided into two
parts for consideration. One part is the bend straightening
force (Fb1, Fb2 and Fb3 in Fig. 3) resulted from the pressing
quantity (reverse bending quantity); another part is the
flattening straightening force caused by the pressing force
applied to the tube by the upper and lower roller. Due to the
reverse bending quantity, the contact line between the roller
and the tube at the middle is 1.5 times longer than that at
both sides; therefore, the uniformly distributed forces for
the upper and lower rollers at the middle and at the ends are
Ft and Ft1, respectively. The resultant forces F of uniformly
distributed force Ft or Ft1 for the upper and lower rollers are
equivalent in size and opposite in direction and act along
the same line, therefore, they can counteract each other, and
the shear force q does not exist. Hereinafter, the new
calculating system for the straightening force is established
based on the analysis of roller-shaped curve, flattening
straightening force and bend straightening force.
3.1 Roller shape curve
Roller shape curve of the oblique roller straightening
machine is the key factor that influences the quality of the
straightening[6]
. Generally, the radius Rr at the thinnest part
of the straightening roller, the length Ls of the straightening
roller, and the fillet radius r of the end portion of the
straightening roller are determined according to strength
condition.
The envelope method is one of the major computing
methods for the curve of the roller shape of the oblique
roller straightening machine. The curve of the roller shape
is considered to be constituted by the envelopes (common
tangents) of an infinite number of spheres in this method.
The radius R' of the sphere is calculated according to the
following formula:矫直力的计算体系创新
摘要：目前在中国，对751辊矫直机矫直力的计算系统一般采用传统的计算系统。矫直力的计算体系受力状态的偏离在751辊矫直机远离辊系统的实际受力状态。在传统的系统，对751辊矫直机矫直力的计算模型是基于双曲线辊形，导致管和矫直辊过于短，即之间的接触线的长度，只有0.1–0.2滚筒的长度。因此，建立计算机系统从实际测量结果的比较大的差异。为了解决上述问题，平整矫直弯曲矫直对材料力学分析的基础上，曲梁理论，采用А包络法辊形。И。Целиков产生，并在751辊矫直机矫直力的一种新的计算系统的建立。矫直辊的辊形，其矫直力的新的计算系统的基础，是根据理想的充分接触，管和矫直辊辊体之间的条件下的包络法设计，因此新的计算模型符合矫直力的实际状况。根据有限元法的新的计算系统的比较与矫直力的实测结果，它已被证明为矫直力的新的计算系统的计算精度满足工程实际要求。新的751辊矫直机是根据新的计算系统的设计和制造，和新机器不仅具有较高的精度和质量，而且还采用了力传感器和计算机结合实现矫直力矫直机的全自动调整的新的计算系统。新的751辊矫直机，取得了显著的经济效益和社会