Roller type continuous cold roll forming method for U-shaped steel sheet pile

Abstract

The invention relates to a roller type continuous cold roll forming method for a U-shaped steel sheet pile. The forming method of the U-shaped steel sheet pile comprises the following steps that stripsteel is placed on a rolling cold roll forming machine, and the strip steel advances and smoothly and continuously enters symmetric up-and-down paired roller dies from a first frame to a seventeenthframe, so that the two sides of the strip steel are bent symmetrically to be provided with a first bending part, a second bending part, a third bending part and a fourth bending part in sequence, specifically, the outer side of the first bending part is vertical, the second bending part is in the shape of an increment angle theta 5 from the horizontal plane, and the inner side of the third bendingpart is vertical; and a U-shaped steel sheet pile is hinged flat and shaped, and then is fed into a cutting unit for fixed-length cutting to obtain a U-shaped steel sheet pile finished product. Through the above method, a U-shaped main body and two-side lock catch structures of the U-shaped steel sheet pile are synchronously formed, the adjacent U-shaped steel sheet pile lock catches are in a straight bearing surface mode through continuous cold roll, the torque of an upward forming method of the lock catches is reduced, the pass of the roller frames is saved, the connection bearing performance and the connection reliability of the adjacent U-shaped steel sheet piles are improved favorably, the loss of the roller dies is reduced, and bending cracks are avoided, so that the U-shaped steelsheet pile meets the use requirements better.

Description

technical field [0001] The invention relates to a roll-type continuous cold-bending forming method for U-shaped steel sheet piles, and belongs to the technical field of steel sheet pile forming processing. Background technique [0002] U-shaped steel sheet pile is a type of steel with locks on both sides and the shape of the letter U as a whole. It has good water-tightness, is conducive to earthquake-resistant design, can be reused, and is conducive to earthquake-resistant design. It can be connected with each other through locks. The steel sheet piles are driven or pressed into the foundation with a pile driver, so that they are connected to each other to form a steel sheet pile wall, which is used to retain soil and water and is widely used in bank revetment engineering, mining engineering, and building foundation engineering. According to the production process, it can be divided into thermal Rolled tensile steel sheet piles and cold-formed steel sheet piles, among which ...

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Problems solved by technology

[0004] The U-shaped steel sheet pile roll-type cold-bending forming process in the prior art has the following defects: (1) The locks on both sides of the U-shaped steel sheet pile are in an arc-shaped reverse bending structure, and the upward forming method is adopted according to the design concept of Eurogang. In addition to using upper and lower rollers, side vertical rollers are also needed to help shape, resulting in high equipment cost and high precision requirements; (2) The arc-shaped connection on the side of the lock has insufficient contact bearing capacity. Insufficient straight force and formability lead to large continuous twisting torque, complex process, high requirements on the forming surface of the roll, which affects the reliability of the lock connection; (3) The deformation angle of the bending pass is large, and it is easy to exceed the plate and the roll The yield strength limit of the wheel, especially for steel with high carbon or alloy content, will cause severe wear of the roller, rough surface at the bend, obtuse angle bending cracks or cracks, excessive thinning of the neutral layer at the bend, and plate back The elastic angle affects the degree of plastic deformation and material stiffness, making it difficult to meet the quality of finished products

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