Mechanical properties and forming method of square tube:

Square pipe is a kind of square pipe, that is, steel pipes with equal side length. It is rolled from strip steel after processing.

Square tube drawing: generally, strip steel is unpacked, leveled, curled, welded to form a round tube, then rolled into a square tube and cut to the required length.

Mechanical properties:

Strength refers to the function of Q195 welded square tube material to resist damage (moderate plastic deformation or fracture) under static load. As the load functions in tension, compression, meandering, shearing and other ways, the strength also includes tensile strength, compressive strength, bending strength, shear strength and so on. There is always a definite connection between various strengths, and tensile strength is usually taken as the basic strength indicator in use.

【1】 The function index analysis of Q195 welded square tube - the load on the machine parts due to the great progress of strength is called the frontal load, and the ability of Q195 welded square tube to resist damage under the frontal load is called the frontal toughness.

【2】 Function index analysis of Q195 welded square tube - the strength, plasticity and angle discussed in the section of "attack toughness" are all machine function indicators of metal under static load. In theory, many complete machines are repeatedly loaded with employment services, and in this environment, the whole machine is tired.

【3】 Function index analysis of Q195 welding square tube - Common methods of fatigue include Q195 welding square tube Brinell angle (HB), Rockwell angle (HRA, HRB, HRC) and Vickers angle (HV). Angle is a pointer to measure the hardness and softness of metal materials. The pressing angle method is commonly used to determine the internal angle in the immediate life. It uses an indenter with a certain geometric shape to press into the surface of the tested metal material under a certain load, and determines the angle value according to the degree of pressing.

【4】 Function index analysis of Q195 welding square tube - angular plasticity refers to the ability of Q195 welding square tube material to undergo plastic deformation without damage under load.

【5】 Function index analysis of Q195 welded square tube - mechanical function of plastic square tube.

Molding method:

1. Solid bend

For solid bending, it literally means that the bending is compacted. During solid bending, the inner and outer rollers and the inner and outer walls of the tube blank are compacted in both directions.

1) The advantage of real bending is small elasticity, good molding, and only the standard roll shape is needed. The R of internal angle molding is comparable to the standard.

2) The defect of real bending is tensile/thinning effect. First, the actual bending will make the bend stretch, and the stretching effect will shorten the longitudinal length of the bending line; Second, the metal at the real bend will become thinner due to stretching.

2. Empty bend

The empty bending is the bending moment formed by the one-way contact between the outer roll and the outer wall of the tube blank to bend the strip. The empty bending will cause the bending line to shrink, and the shrink effect will make the bending line longitudinally extend, and the metal at the bend will be stacked and thickened. This is the shrink/thicken effect of empty bending.

1) The advantage of empty bending is that it can stop the bending of side length when the actual bending cannot be stopped, for example Rectangular Pipe The upper/side edges of are bent and finished synchronously. Empty bending can also bend the inner corner with R<0.2t without breaking the pipe wall.

2) The defect of empty bending is that when the upper side/side side are simultaneously empty bending, because the upper roll and the lower roll produce pressure at the same time, the forming force is easy to exceed the critical point, forming the edge instability concave, and will also affect the stable operation of the unit and the forming quality. This is also square Torque tube It has different characteristics from that of hollow tube bending.

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