A detailed overview of sheet metal basics, and what knowledge sheet metal engineers need to master

Sheet metal engineers need to master mechanical drawing and drawing skills, software skills, and professional skills.

1. Mechanical drawing and drawing ability.

This is the minimum basic requirement for an engineer, if one to three views, the first.

1. How to design for people who can't understand triangle drawing, dimensional tolerances and fits, shape and position tolerances, and can't see through engineering drawings? Therefore, mechanical drawing and drawing recognition is a foundation. In addition, you should understand the different painting methods and different standards in different countries and regions, and be able to use them freely.

2. Software capabilities.

The society is watching, and now many factories and enterprises are arguing that they have lost their drawing boards and pencils and adopted the CAD CAM system. The CAD system not only has high work efficiency and low labor intensity, but also has clear drawings and is not easy to make mistakes. It is being adopted and promoted by more and more businesses.

If you do not know how to use engineering computers and related engineering software, a qualified and competent engineer should have some foreign language skills in addition to being able to use computers and related engineering software.

3. Professional skills.

Since the parts are designed by product design engineers, processing is not their specialty, and they tend to focus on the function of the parts when designing, and often consider less about the processing process of the parts, that is, the manufacturability of some parts may be poor. For example, the ratio of hole diameter to material should not be too small, otherwise the strength of the punch will be affected.

There should be proper rounded corners to avoid stress concentration; The round hole should not be too close to the bending line, so as not to elongate the round hole when bending; The bending height should not be too small, so as not to bend up; The burr of the punching cut should be avoided on the outside to avoid causing side cracks; The extraction height should not exceed the extraction limit of the material, so as not to fail to extract; The extraction fillet should not be too small to avoid unattainable or extremely low process capacity.

Automobile sheet metal is a processing method for automobile maintenance, also known as cold work, to say that directly, if the appearance of the body is damaged and deformed, the process of sheet metal is needed. Automobile collision repair has developed from the original "smashing, pulling and welding repair" to the secondary manufacturing assembly of the body. The repair of a crash vehicle is no longer a simple knock on the sheet metal of the car.

The quality of the restoration cannot be observed by the naked eye alone. Maintenance personnel should not only understand the technical parameters and dimensions of the body, but also master the characteristics of the body materials, the transmission of the characteristics of the force, the deformation trend and stress points of the body, and the production process of the body, such as welding process.

In automobile manufacturing and maintenance, the shape of many sheet metal structural parts is very complex, in order to avoid the difficulty of the plate, the sheet metal material must have good process performance requirements, namely:

1. The sheet metal material must have good plasticity. It is necessary to have the ability to produce permanent deformation without being destroyed under the action of external forces. For cold work parts, it is necessary to have good cold plasticity, such as stamping parts of automobile parts; For hot work parts, it is necessary to have good thermoplasticity, such as hot forgings, spring steel plates, hot rivets, etc.

2. Good weldability. Many automotive sheet metal parts are welded together by spot welding, oxygen welding, arc welding or gas shielded welding, so sheet metal parts are required to have good welding performance. This is especially important in the repair of automobiles, where materials with good weldability have high welding strength and low cracking tendency.

The main contents include: sheet metal drawings, templates, automotive sheet metal materials, steel and other heat treatment, processing and forming, automotive sheet metal welding process, etc.

Automobile sheet metal knowledge Automobile sheet metal explanation: 1. Automobile sheet metal is a processing method for stupid car maintenance, also known as cold work, to say that if the body appearance is damaged and deformed, the process of sheet metal is needed. Automobile collision repair has developed from the original "smashing, pulling and welding repair" to the secondary manufacturing assembly of the body. 2. The repair of the collision accident vehicle is no longer a simple knocking on the sheet metal of the car, and the quality of the repair cannot be observed by the naked eye alone to observe the appearance and gaps of the vehicle.

Maintenance personnel should not only understand the technical parameters and dimensions of the body, but also master the characteristics of the body materials, the transmission of the characteristics of the force, the deformation trend and stress points of the body, and the production process of the body, such as welding process. 3. On the basis of mastering these knowledge, maintenance personnel should also use advanced measurement tools to judge the direct and indirect damage and deformation of the body through accurate three-dimensional measurement of the body, as well as the hidden dangers of leading or due to the deformation of the body, and formulate a complete body repair plan, and then cooperate with the correct maintenance process and accurate three-dimensional data of each key point of the body, restore the key points of the body to the original position and restore the damaged body to the state when it left the factory. @2019

1 Fitter: counterbore, tapping, reaming, drilling. The counterbore angle is generally 120, which is used for drawing rivets, 90 for countersunk screws, and tapping inch bottom holes.

2 flanging: also known as hole drawing, turning holes, is to draw a slightly larger hole on a smaller base hole, and then tapping, mainly with sheet metal processing with a relatively thin plate thickness, increase its strength and the number of thread circles, to avoid slipping, the general state ruler is used for the plate thickness is relatively thin, the hole circumference is normal shallow flanging, the thickness is basically unchanged, when the thickness is allowed to be thinned by 30-40%, you can get a height of 40-60% higher than the normal flanging height, and when you squeeze 50%, you can get the maximum flanging height, when the plate thickness is larger, such asPlate thickness above 5 can be tapped directly.

3 punch: is the use of mold forming processing process, the general punch processing has punching, cornering, blanking, punching convex (bump), punching tearing, punching, forming, etc., the processing needs to have the corresponding mold to complete the operation, such as punching blanking die, punch mold, tearing die, punching die, forming die, etc., the operation mainly pays attention to the position, directionality.

4 riveting: high riveting of the sail press as far as the company is concerned, there are mainly riveting nuts, screws, loose and so on, which is the suspicion of the draft through the hydraulic riveting machine or punch to complete the operation, riveting it to the sheet metal parts, as well as the riveting method, need to pay attention to directionality.

5. Bending: Bending is to fold the 2D flat parts into D parts. Its processing needs to be completed by a bending machine and a corresponding bending die, and it also has a certain bending sequence, and its principle is to fold the next knife without interference, and then bend with interference.

Automobile sheet metal is a technical means of automobile repair, which refers to the repair of the car body after the collision, that is, all the work except for the anti-corrosion and decoration of the car body, in short, the automobile sheet metal is to completely repair the faulty and damaged car body.

Automobile sheet metal is also called cold work, to be direct, if the appearance of the body is damaged and deformed, the process of sheet metal is needed. Automobile collision repair has developed from the original "smashing, pulling and welding repair" to the secondary manufacturing assembly of the body. The repair of the collision accident vehicle is no longer a simple knocking on the sheet metal of the car, and the quality of the repair cannot be observed by the naked eye alone.

Extended information: 1. Automobile sheet metal maintenance personnel should not only understand the technical parameters and dimensions of the body, but also master the characteristics of the body material, the transmission of the characteristics of the force, the deformation trend and stress point of the body, and the production process of the body, such as the welding process. On the basis of this knowledge, maintenance personnel also need to use advanced measurement tools to make accurate 3D measurements of the car body.

2. The technology of automobile sheet metal should judge the direct and indirect damage and deformation of the body, as well as the hidden dangers due to the deformation of the body, formulate a complete body repair plan, and then cooperate with the correct maintenance process and the accurate three-dimensional size data of each key point of the body, restore the key points of the body to the original position, and restore the damaged body to the state when it left the factory.

3. Since the car is a high-precision whole. And electrical accessories and mechanical accessories should be attached to the corresponding position of the car body with high precision and low error. Even the straightness and curviviness of the paint are highly dependent on the error value of the body sheet metal, so the sheet metal body and repair have become a pure manual work in the automotive industry that has no hard standards, no automatic tools, and cannot be intuitively taught.

4. The car body assembly includes: the sum of the body sheet metal parts of the car glass, the whole car lamps, the whole car interior and exterior decoration parts and handles, seats and accessories, the lock mechanism, the window sealing and lifting mechanism, the door and the front and rear sail cover connection activity mechanism, the sum. That is to say, when the owner's car has problems such as broken glass, door lock failure, and damaged decorative parts, remember to find the car sheet metal instead of other types of work.

According to the basic processing method of sheet metal parts, as follows, bending, stretching, forming, welding, grinding, trial assembly, cleaning, scraping, grinding, painting, and then entering the oven, coming out of the finished product assembly, listing.

Pro E (sheet metal) plate? cad？Or is it a car sheet metal worker?

There are not many basic knowledge on the Internet, or go to the book by yourself, recommend a few books "Automobile Construction", "Automobile Theory", "Automobile Design", which is a must-learn book for people who learn automobiles from shallow to deep, of course, there are some others, such as "Automotive Electronic Technology", "Automotive Experiment", "Random Vibration", "Body Design"...

Automobile sheet metal data restoration is a technical means of automobile repair, the key is to repair the body after the collision, except for the body repeated and decorative spraying, all basically called automobile sheet metal data restoration.

Automobile sheet metal data recovery includes the analysis of automobile body damage, the measurement of automobile body, the shaping of automobile body sheet metal, tensile correction, etc. Of course, automobile sheet metal I think is a production and processing technology of automobile repair, also known as cold work, simply put, if the body shape is damaged or deformed, it needs to be processed by the process of sheet metal. The repair of a crash vehicle is not simply a matter of beating the sheet metal of the car, and the quality of the repair is not necessarily just a matter of observing the appearance or gaps of the vehicle with the naked eye.

It is necessary to restore the three-dimensional data of the key points of the body to the state when it leaves the factory.

Sheet metal parts are products processed by sheet metal technology, and we can't do without sheet metal parts everywhere in our lives. Sheet metal parts are made by filament power winding, laser cutting, heavy machining, metal bonding, metal drawing, plasma cutting, precision welding, roll forming, sheet metal bending forming, die forging, water jet cutting.

A definition in a foreign professional journal can define sheet metal as: sheet metal is a comprehensive cold working process for metal sheet (usually below 6mm), including shearing, punching and composite, folding, welding, riveting, splicing, forming (such as automobile body) and so on. Its distinctive feature is that the thickness of the same part is the same.

You can do the same thing in cars, as long as you like it.

Sheet metal is a comprehensive cold working process for metal sheets (usually below 6mm), including shearing, punching, lamination, folding, riveting, splicing, forming (such as automobile body) and so on. Its distinctive feature is that the thickness of the same part is the same.

Generally speaking, the basic equipment of sheet metal process includes shear machine, CNC punching machine, laser, plasma, water jet cutting machine, bending machine and various auxiliary equipment such as: uncoiler, leveling machine, deburring machine, spot welding machine, etc.

Generally, the four most important steps of the sheet metal process are shearing, punching, rolling, welding, surface treatment, etc.