Dentless paint repair ( PDR ), also known as removal of paintless dents , describes methods for removing small dents from the body of a motor vehicle. Various damages can be repaired using the PDR as long as the paint surface is intact. PDR can be used on aluminum and steel panels.
The most common practical uses for PDR are repair of hail damage, door slamming, small creases, large dents and damage to body lines.
This method can also be used to prepare damaged panels for repainting by minimizing body filler usage. This technique is now known as "push to paint" or "push for paint".
Limiting factors for successful improvements using PDR include paint flexibility (most recent end-of-end automotive paint finishes allow successful PDRs) and the extent to which the metal has been stretched by damage, which depends on the thickness of the metal, curvature or flatness where damage occurs and the intensity the impact. In general, the slower the dent, the more likely it is that a paintless dent repair is a good choice. Even the dent of a few inches in diameter can be fixed by this method as long as the metal and paint are not stretched. Most experienced technicians can fix superficial dents or large creases to acceptable levels, but very sharp dents and wrinkles may not be suitable for PDRs.
Video Paintless dent repair
History
Paintless dent removal was created by Oskar Flaig in February 1960 during the "International Motor Sports Show" in New York City, USA.
Oskar Flaig is a regular member of staff at Mercedes. His job was to take care of the paint of all the show cars presented at the trade show. Damage, scratches on paint and small dents, produced by the public during the day, need to be repainted at night, so the vehicle will be in perfect condition the next day. At a trade show in New York City, Oskar Flaig used a hammer handle to push a small dent, so he had to apply fewer fillers before painting. Nevertheless, the results have looked perfect after pushing. This is the beginning of the removal of a paintless dent.
In another form of working metal, a technique similar to the removal of a paintless dent, may have been used in the early 1930s at an automotive assembly plant, and was popularized shortly after.
Maps Paintless dent repair
Technique
The most common PDR technique utilizes metal rods and body picks to push the dent from the bottom of the body panels. Specially designed gins and tabs can be used to remove a dent from the outside of the panel. A good repair setting often involves tapping repairs to remove small spots. Qualified technicians can combine high dots to match the paint texture called orange peel. Pushing too hard can create high spots that cause clear layers and paints to split or crack. Experienced technicians can avoid cracking or chipping with the use of heat, although the repainted surface has a greater likelihood of cracking. Furthermore, it is not wise to "glue pull" painted panels, as you risk also attracting non-factory paints. When the damage is so great that body fillers are needed, PDR technicians can "push to paint", complete most of the damage before small filling, sanding, and painting, saving time and money.
The process of paintless spray repair requires technicians to manipulate the exact location of the metal to the right height, which can only be observed using a PDR reading tool such as a paintless dent repairs light. A fluorescent or LED lamp, or in some cases a reflection board, can be used to visualize a dented deformation and to assist the technician in finding the tip of the tool used to push the metal. Without reflection from light sources or boards to read dents, the fine detail of the process may not be suitable for technicians.
Advances in PDR techniques are constantly updated and upgraded. One of the bigger advances of Paintless Dent Repair is with the advent of Dentology.
Dentology , is a branch of auto body repair, dealing with the removal of minor pressure defects in metals, through the scientific method, commonly referred to as paintless dent repair. It deals with, but is not limited to, the process of restructuring the metal on the vehicle to its original state, after a minor impact or drive. Dentology mainly deals with two types of dents, perforated and prominent, with two main causes of dynamic firing and quasi static stabbing; together, they contain endless subcategories and varieties. This branch, defines a dent or ding as a discontinuity against the resistance panel and the stiffness of the original factory settings. Which is usually made by hail damage (dynamic dent), or by structural structural barriers caused by "slamming doors" to the outer shell (quasi-static clink).
Micro and Macrodynamic Mapping: Dents are further defined by size factor mapping : breath, length, depth, location, metallurgical alloy, paint, structural barrier, and environmental variation. The size of the mapping of the dent factor, especially focused on the shape and shape of this discontinuity. Hollow dynamic denting is the most common, defined as an inward-out push, and is caused by a number of factors that the vehicle will encounter, from the outside world. Prominent dynamic stab is much rarer, at least as stand-alone: ​​often accompanies a large dent when the buffer is struck from pushing the outer shell to the support. That is, together these two types of dents make macrodynamics , which is the study of complex dent structures as they relate to dentology and microdynamics , which are associated with simple dent structures..
Mapping Origins: Microdinamics deals with the most basic forms found in dentology: namely, triangles and circles. Due to the most complex remote triangular dent of both, let's briefly touch on the structure. The contour of the origin either laterally or diagonally, is the innermost point of origin; this is caused by the shape of the object that overrides the panel, in this case triangular shape. The object paths that hit the panel affect the depth of dent and the vertical and lateral strike angle. This is important because it helps repair the damage at least in theory. The reverse engineering process of the dent is known as reversing the origin, while the whole process identifies the contour of origin called mapping origin or simply, mapping . However, the overall purpose of the mapping is to reverse the origin. When faced with a triangle we start with a trench.
The Trench: The ditch or " the origin of the" "of the fold is the lateral origin along its length and includes any and all the damage attached along its line. The ditch does not refer to the bottom of the fold overall, but the entire damage to enter the teardrop or entry point.These trenches have a wall attached to the repair section that is not damaged around the crease.It is called a bank or just a dike.Bud boss, although relatively flat is still affected by the folds due to the displacement of the metal, which we will not discuss here.Hold and prominent folds are vertical structures defined by their origin and relation to the angle of the medial embankment.The folds have two separate origins 1) lateral origin which is the trend or the lowest point that goes in the direction of its impact 2) medial origin , which starts on one side of the ditch and runs to the other high side of the ditch through its origin. Vertical averages are always half-cut and create two angled elbows through the center of the fold. This allows us to mathematically determine the exact angle of origin, based on medial origin and hipotenusa embankment . The medial origin has two medial embankment angles on each side determined by the origin angle, for brevity we call it alpha/bravo banks . As a result we can begin to define rules, such as: 1) Do not fold the embankment above its origin. 2) Always open the embankment instead of closing. 3) Create a pass on the lateral side along the original path. Just to name a few.
References
Source of the article : Wikipedia
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