Design Of Correction Device For Bending Deformation Of Automobile Sheet Metal

I. Introduction

Sheet metal is a commonly used stamping process in the field of auto parts. During the stamping process, there are various physical reactions, such as expansion, wear, physical deformation, etc. The common phenomena are surface unevenness, parts cracking, excessive Stretching, etc., lead to the failure of the machining progress, dimensional errors and process standards of the parts to meet the actual production standards. Based on this, it is of great practical significance to carry out the calibration design of automobile sheet metal.

After the automobile sheet metal is bent and deformed, due to its small thickness, if the surrounding area cannot be effectively protected during calibration, it is easy to cause secondary deformation, resulting in more complex deformation and more serious damage. As a result, the bending deformation at this stage is mostly corrected manually, which takes a long time, has low work efficiency, and requires high work experience of the staff.

The bending deformation correction device of automobile sheet metal is positioned by setting the pre-compression damping component and the air hammer, and the vibration load is absorbed by the damping spring, so as to realize shock absorption during the restoration process, so as to ensure the effectiveness of the whole pressing process. Avoid secondary deformation, and can realize automatic correction during the entire calibration process. The staff only needs to control the operation intensity by detecting and observing the deformation amount.

2. Structural design

The bending deformation correction device of automobile sheet metal is shown in Figure 1, which includes a lower backing plate and a pressing plate arranged on both sides of the bending deformation part, two pre-compression damping components arranged at both ends of the lower backing plate and the pressing plate, and a middle part of the pressing plate. air hammer. The pre-compression damping assembly includes a pre-compression cylinder fixed on the pressure plate, a tie rod connected with the piston rod of the pre-compression cylinder and slidably passed through the lower backing plate, a fixing nut arranged on the lower end of the tie rod, and a fixing nut arranged on the lower end of the tie rod. Shock spring between the bottom plate and the bottom plate. An upper backing plate is arranged between the pressing plate and the bending deformation member, and a guide sleeve is fixedly arranged between the upper backing plate and the pressing plate.

(The serial number in the figure: 1 is the lower backing plate, 2 is the pressure plate, 3 is the air hammer, 4 is the pull rod, 5 is the tightening nut, 6 is the shock-absorbing spring, 7 is the upper backing plate, 8 is the guide sleeve, 9 is the Anti-skid pad, 10 is the bending deformation part, 11 is the pre-pressure cylinder)

3. Overview of Implementation Cases

The automobile sheet metal bending deformation correction device realizes the positioning of the bent sheet metal parts through the pre-compression damping component and the air hammer. The pre-compression shock absorber assembly passes through the pre-compression cylinder on the pressure plate,The tie rod, tightening nut and shock-absorbing spring running through the bottom plate are used to fix the bent sheet metal parts. Referring to Figure 1, both ends of the bent sheet metal part are fixed between the lower backing plate and the upper backing plate; in order to strengthen the fastening strength, the inner side of the upper backing plate is provided with anti-skid pads or anti-skid teeth. The shock absorber spring is designed to absorb the vibration during the repairing process of the bent sheet metal part, thus ensuring the effectiveness of the sheet metal part during the pressing process.

A guide sleeve is fixed between the upper backing plate and the pressure plate. The height of the guide sleeve is 35mm ~ 65mm. Its function is to ensure the up and down linear movement of the shock-absorbing spring, thereby avoiding the secondary deformation of the sheet metal parts during the repair process. A slide rail is arranged between the air hammer and the pressing plate, and the air hammer can move freely on the pressing plate. The lower part of the pressure plate is provided with a sensor to realize the identification of the bent parts of the sheet metal part. When the bending sheet metal part is detected to be deformed (concave or convex), the sensor recognizes the bending position, the air hammer moves to the upper part of the bending position of the sheet metal part, and automatically presses down to realize the pressing and repairing of the sheet metal part.

The deformation correction process is based on the requirements of the bending workpiece, the two ends of the bending sheet metal part are fixed between the lower backing plate and the upper backing plate, the air hammer assembly is first moved to the bending position of the sheet metal part, and the air hammer is automatically pressed down to realize the alignment of the sheet metal parts. Press the metal parts, then return, repeat the above process until the sheet metal parts are completely repaired.

4. Use Effect

The designed automobile sheet metal bending deformation correction device has a reasonable structure design and high work efficiency, and can quickly and accurately realize the bending correction of the plate. It has the following advantages:

• The design of the shock-absorbing spring can absorb the vibration during the repair process of the bent sheet metal parts, so as to ensure the effectiveness of the sheet metal parts in the pressing process.
• The design of the guide sleeve ensures that the shock-absorbing spring moves up and down in a straight line, thereby avoiding the secondary deformation of the sheet metal parts during the repair process.
• During the bending correction process of sheet metal parts, the air hammer assembly can accurately identify the deformation of the bent sheet metal parts, and automatically press down to realize the pressing and repairing of the sheet metal parts, and realize the automatic correction and repair of the sheet metal parts. It is only necessary to control the operation intensity by detecting and observing the deformation amount.
• There are anti-skid pads or anti-skid teeth on the inner side of the upper backing plate, which strengthens the stability of the clamping of sheet metal parts.

5. Conclusion

Sheet metal parts are prone to surface unevenness, parts cracking, overstretching and other phenomena during use, and after the bending deformation of automobile sheet metal, due to its small thickness, when correcting, if the surrounding area cannot be effectively carried out. The protection of the area can easily cause secondary deformation, resulting in more complex deformation and more serious consequences. At present, the bending deformation of sheet metal parts on the market is mostly corrected manually by equipment, which takes a long time, has low work efficiency, and requires high operating experience for operators. The automobile sheet metal bending deformation correction device is developed to realize the automatic correction of sheet metal parts, and the shock absorption mechanism is designed to ensure the effectiveness of the entire pressing process, avoid secondary deformation, and make up for the deficiencies of the existing technology. The staff only needs to control the operation intensity by observing the deformation amount, which is convenient to operate and has great market application value.

Link：Design Of Correction Device For Bending Deformation Of Automobile Sheet Metal

REF: Sand Casting Service, Custom Car Parts, Mold Making