The R angle in the square tube is the transitional arc at the junction of two planes, which is generally the half-warp of the center line of the curved R angle. The value of the curved arc R is generally 1.5~2.0 times the pipe diameter, and the size of the R angle is Determined according to the wall thickness of the square tube, the R angle is divided into an inner R angle and an outer R angle, and the inner R is generally 1.5~2 times the wall thickness, and square steel pipes with different R angles can also be produced according to user requirements.

For example: a rectangular steel pipe with arc R, A=1.0MM, diagonal line=1.15MM, how do you know the R angle? If it is a square steel pipe with an arc, is the calculation method the same? A rectangle is long A and wide B, opposite corner C, and the radius R of the four corners are equal. To find the size of R, the formula is as follows: (C/2-R)^2=(A/2-R)^2+(B/2-R)^2 C^2/4-CR+R^2=A ^2/4-AR+R^2+B^2/4-BR+R^2 4R^2-4(A+B-C)R+(A^2+B^2-C^2)=0 is used to find The root formula can be used to find R.

Here it should emphasize that the R angle of the lower rectangular tube does not refer to the arc, but the central angle. The arc refers to a section on the circumference, and the angle between the two ends of the arc and the center of the circle is the central angle. Since the circumference of a circle is 2πR, and its corresponding central angle is 2π, the arc length corresponding to the unit central angle = 2πR/2π=R. Therefore, the arc length corresponding to any central angle a (radian unit) = aR. The measurement methods and tools for the R angle of square rectangular tubes include R gauges and projectors, etc. R gauges can be used for rough ones, projectors can be used for fine ones, and three-coordinate measuring instruments can be used for more demanding ones.