At present, the reasons for the demand for sheet metal repair in most sedans in China can be summarized as the repair of bending, tearing, and wrinkling. There are also certain differences in repair techniques for different repair situations. The repair needs of automotive sheet metal parts are mostly caused by external forces such as compression and impact.
Bending repair
The bending repair techniques for automotive sheet metal parts are applied when the vehicle is subjected to external force compression or impact, resulting in severe damage to the compressed or impacted area or a certain area; And it is necessary to accurately measure deformation area, damage, and other data through observation or with the help of professional detection tools.
During the repair process, the main method is to use the support method to repair the damaged area, and to repair the bending of the automotive body sheet metal parts by exerting the reverse force in the direction of the support pull. However, in the process of utilizing the support method, attention should be paid to the application of gap pads to reduce damage to the car body caused by repair behavior.
Tear repair
The tearing repair of automotive sheet metal parts may result in the misalignment of the sheet metal in most cases, and in severe cases, it may also lead to the loss of flesh or material. When repairing, there are two steps to go through: first straightening and then welding. The straightening operation is the preliminary treatment of damaged parts of automotive sheet metal parts, and then using oxygen welding to complete the repair of the damaged parts. However, in this process, the use of modern new welding equipment CO2 gas welding will make the welded joint of the damaged area smoother.
If there are ductile protrusions at the welding junction, a new method of repairing concave convex damage is needed to repair the position of the welding junction. When dealing with severe tearing damage, the repair work of automotive sheet metal parts can be completed by digging or replacing new components.
Fold repair
The pleating repair of automotive sheet metal parts mainly involves repairing the damaged areas with elastic or plastic deformation for pleating or concave convex damage. Judging the manifestation of wrinkle damage in automotive sheet metal parts is the basis for selecting appropriate repair methods. For concave and convex damage, modern equipment body repair meson machines can be used to repair, and combined with hammering or drawing methods to repair the damaged parts.
The common repair method for minor dents is to use a pad iron at the lowest position of the concave part on the opposite side, and repeatedly hammer to repair the damage; For severe concave convex damage, it is necessary to use a pad at the back of the concave area to support and restore it. Due to the need for more tensile support for support recovery, it is possible to heat the concave position in advance and pay attention to the consequences of ejection in a timely manner, analyze the rebound phenomenon, and ensure that the concave and convex damage is fully repaired.
For wrinkled damage, the opposite external force is used to further expand the wrinkled position of automotive sheet metal parts, achieving the transformation between wrinkled damage and concave convex damage, and then using corresponding meson machine shrinkage repair methods for repair.
measuring method
At present, in the detection instruments for car bodies, the traditional method is to use mechanical universal measurement systems and modern new technologies, mainly fully automatic electronic measurement systems, to calibrate a large number of instruments. By ultrasonic transmitter