How Crowning Tables Improve Bending Accuracy

As an industry professional with years of experience, I’ve witnessed firsthand how crowning tables improve bending accuracy. These innovative tools play a crucial role in compensating for deflection in press brakes, ensuring that each bend is precise and consistent. In this article, I’ll explore the benefits of using crowning tables, how they enhance overall efficiency, and the specific techniques that can maximize their effectiveness. Whether you’re new to metal fabrication or looking to refine your processes, understanding the impact of crowning tables will elevate your bending operations to the next level.

Crowning Method Classification

In order to eliminate the adverse effects of slider deformation, the deflection deformation of the slider needs to be compensated. The usual Crowning method is divided into mechanical Crowning and hydraulic Crowning.

Table hydraulic automatic deflection Crowning mechanism, which is composed of a set of cylinders installed in the lower table, the position and size of each Crowning cylinder is designed according to the slider, table finite element analysis of the deflection Crowning curve, hydraulic Crowning is through the relative displacement between the front, middle and back of the three vertical plates to achieve the neutral version of the bump Crowning, the principle is through the elastic deformation of the steel plate itself to achieve the bump, so its Crowning The amount of Crowning can be adjusted within the elastic range of the table.

hydraulic crowning

The mechanical crowning table consists of convex wedges designed based on the deflection curve of the slider and table from FEA analysis. The CNC system calculates the required crowning based on the load force during bending, which causes deflection, and automatically adjusts the wedges’ positions. This compensates for deformation, ensuring consistent gaps between upper and lower tooling, achieving uniform bending angles along the workpiece length.

Mechanical Crowning Classification

According to the control mode, it can be divided into electric Crowning and manual Crowning. Electric Crowning through the system control for automatic Crowning; manual Crowning through manual adjustment Crowning.

According to the direction of adjustment, it can be divided into one-way adjustment and two-way adjustment. One-way adjustment: automatic or manual adjustment in Y direction; two-way adjustment: automatic or manual adjustment in Y direction and manual adjustment in X direction.

According to the adjustment method, it can be divided into a scale nut, hand crank, and motor.

According to the width of the table, it can be divided into narrow type and wide type. Generally narrow type table is equipped with 1V,2V,4V concentric lower die; generally a wide type table is equipped with multi-V lower die. If you need to match 1V,2V,4V molds, you need to match the mould drag.

Parameter Introduction

Video Demo