Manipulation correction
Manual correction is to exert external force on deformed steel by manually operating tools such as hammer, iron and clapper. In order to achieve the purpose of correcting deformation. Manual correction is simple and flexible, and is generally used to correct the local deformation of thin steel plate, small steel and small structural parts. At present, manual correction is still the main method in automotive sheet metal.
First, the correction of thin plates.
1. Correction of bulge deformation in the middle of thin plate
(1) Put the convex surface of the metal plate upward on the platform, hold the metal plate with one hand and knock it with the hammer with the other hand (as shown in Figure 3- 1).
(2) Tapping should start from the edge around the plate and gradually approach the center of the bulge.
(3) When hammering, the hammering force at the edge is heavier and the hitting point density is higher. The farther away from the center of the bump, the smaller the hammering force and the finer the density of the hitting point.
(4) After the sheet is basically corrected, adjust it with a wooden hammer to make the whole tissue stretch evenly.
2. Correction of wave deformation around thin plate
(1) Put the metal sheet on the platform, press the metal sheet with one hand and beat it with the hammer with the other.
(1) When striking, the striking point should start from the middle of the sheet and gradually spread to the surrounding edges, from dense to sparse, as shown in Figure 3-2.
(3) When striking, the striking force in the middle is heavier, and gradually becomes lighter around.
(4) After the sheet is basically corrected, adjust it with a wooden hammer to make the whole tissue stretch evenly.
3. Correction of diagonal warping of thin plate
Corrective tapping should start from the diagonal, without warping, and extend to both sides in turn to make it extend and tend to be flat.
4. Correction of the deformation of curved convex drum
First aim the hammer at the center of the abutment, and then knock and trim it. The hand holding the hammer should not be too tight, but should be struck with the strength of the wrist. Tapping speed should be around 100 times//min (as shown in Figure 3-4).
5. Correction of surface depression deformation
The pier should be slightly placed in the hammering position, with the hammering point at the higher part of the uneven surface and the pier at the lower part. The impact of the hammer makes the end of the convex part press down gradually, and the pressure of the support makes the concave part tend to be flat (as shown in Figure 3-5).
6. Slap correction of plate
If the plate is slightly twisted, it can be corrected by clappers. Take a clapper with a length of not less than 400lnlll, a width of not less than 40m and a thickness of 3-5 mm, and beat it on the board to shorten the compression of the raised part of the board and lengthen the stretched part, so as to achieve the purpose of correction (as shown in Figure 3-6).