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Measures for Improving the Precision of Bending Parts


The accuracy of bending parts does ensure the stability and accuracy of product size and shape and ensures that the produced bending parts can meet the specific needs of customers. Springback, rips, twists, offsets, uneven bottoms, non-straight flanges, hole distortion, and instability in flange height or hole size are common problems when manufacturing curved parts. The emergence of these problems may be caused by the structure and material factors of the bent part itself, or it may be related to process factors such as the stamping process and mold.

Five important issues

plate rolling machine

In the plate bending process, to ensure the quality of the produced products, the following five important issues need to be paid attention to:

Directional question

The elongation of the steel plate in the rolling direction is relatively large, so before blanking, we should consider bending as much as possible perpendicular to the rolling direction. If it is necessary to bend in two directions, it should be cut obliquely to avoid the bending line parallel to the rolling direction and reduce the occurrence of waste products.

Positioning problem

When positioning parts, we should choose a positioning method with high precision, stable size, and convenient operation, and try to avoid positioning methods with complex shapes. At the same time, it is necessary to make full use of the shape and hole positioning of the part itself and increase the process of hole positioning if necessary. For parts with asymmetrical shapes, special attention should be paid to the directionality of its positioning to prevent waste from being generated when the blank is placed.

Bend Height Questions

In terms of engineering structure, sometimes the height of the bent edge must be less than the “minimum bent edge height”, but at this time we can first increase the height of the bent edge so that it can complete the bending, and then cut off the excess material after bending. This avoids situations where the bend cannot be completed due to insufficient height of the bent edge.

Size question

During the manufacturing process, we need to consider that a certain process may have a large deformation, so the high-precision dimensions on the workpiece should be completed in a later process to reduce the occurrence of excessive errors.

Asymmetric piece problem

For asymmetrical curved parts, we can combine their asymmetrical shapes into symmetrical shapes, and take the method of double bending and then cutting. In this way, the force on the blank can be more uniform when it is bent, which is conducive to overcoming the offset and improving the production success rate.

Four Quality Control Measures

Therefore, to improve the accuracy of bending parts, we need to pay attention to the following aspects:

  1. Selection of raw materials: The material and structure of the bending parts should take into account the actual needs of customers, and select raw materials with excellent performance, such as high strength and small deformation capacity, to ensure that the bending parts are more stable and reliable in manufacturing and use.
  2. Preparation of semi-finished products: In the preparation of semi-finished products for manufacturing curved parts, the design should be strictly by the design or customer requirements, and various factors in the manufacturing process, such as material properties, thickness, bending direction, etc., should be considered in advance to determine the pressure, Process parameters such as exhaust to avoid excessive or insufficient bending, to ensure the quality of bent parts.
  3. Process control: In the production process of bending parts, reasonable control should be carried out on various key links, such as matching suitable molds, controlling bending speed, and stabilizing the process flow. For the material and structure of each bent part, minimize or eliminate defects caused by insufficient process control.
  4. Quality monitoring and traceability: During the production process, real-time monitoring and tracking of the quality of bending parts should be carried out, and unqualified products should be eliminated and adjusted in time to classify and distribute qualified products. Unqualified products should be analyzed and evaluated as much as possible, and the relevant quality inspection standards should be continuously improved to avoid recurrence of defects in the subsequent production process.

Final Words

The above are the important precautions and control measures to ensure the quality of the products produced in the plate bending process, especially in production, these precautions can help workers reduce unnecessary waste, reduce production waste, and improve product quality, helping everyone Solve problems in the production process.