What is iron in the rear bumper frame of a car
The iron structure inside the rear bumper of a car is usually called a anti-collision steel beam (commonly known as "bar iron"), which is mainly used to absorb and disperse the impact force during a collision to protect the rear structure of the vehicle.
Function and Structure
Anti-collision steel beams are metal guards that connect the longitudinal beams of the vehicle body, usually made of steel plates or iron plates, and have high strength and impact resistance. In the event of a collision, it can effectively reduce the extent of vehicle damage and ensure the safety of occupants.
Vehicle model differences
Some car models (such as Japanese cars) may use foam materials instead of metal anti-collision beams to reduce costs, but such designs may cause accelerated deformation of the vehicle body structure in severe collisions.
The iron structure inside the rear bumper of a car is usually called the rear bumper frame (abbreviated as rear bumper iron), and its core functions include:
Absorb collision energy
When a collision occurs at the rear of a vehicle, the rear bumper iron acts as an "energy buffer zone", absorbing and disperses the impact force through its own high-strength materials (such as high-strength steel or aluminum alloy), reducing damage to the vehicle body structure.
Support the bumper system
As the supporting structure of the bumper, the rear bumper iron ensures that the bumper is firmly installed at the rear of the vehicle and maintains a stable shape during daily use. If the frame is severely damaged, it may cause the bumper to deform or fall off.
Assess the extent of the accident
The damage to the skeleton is one of the key indicators for determining the severity of an accident. Severe deformation or fracture usually indicates that the vehicle has suffered a significant impact, which may affect the safety of the vehicle body structure.
Protect the vehicle body safety
By rationally distributing the force-bearing points, the rear bumper iron can reduce the risk of damage to key components of the vehicle body (such as the fuel tank, trunk, etc.), indirectly protecting the safety of occupants.
The front bumper frame and the anti-collision beam are not the same component, but they are functionally related:
Structural and functional differences
The front bumper frame is a device that fixes and supports the bumper housing. It mainly consists of the main beam, energy-absorbing box and mounting plate. Its main function is to protect the front structure of the vehicle and support the bumper housing.
The anti-collision beam is a safety device hidden inside the bumper, which is used to absorb energy and reduce the impact on the vehicle body during a collision. It is usually made of metals (such as aluminum alloy, steel pipes) or hard plastics and is commonly seen in low-speed vehicle collision scenarios. Metal anti-collision beams are mostly used in mid-to-high-end models, while plastic anti-collision beams are commonly found in low-priced models. .
"Relevance"
In some models, the front bumper frame and the anti-collision beam may share the main beam structure, but the former focuses on appearance protection while the latter emphasizes collision safety protection. For instance, in the design of metal bumpers, the two may be used in combination; Plastic bumpers usually only contain the front bumper frame.
The impact of rear bumper frame replacement on a vehicle depends on the reason for replacement, the quality of the process and the type of parts. It mainly involves safety performance, vehicle value and accident classification. However, if the operation is standardized and the damage is minor, the overall impact is limited.
Youdaoplaceholder0 safety performance affects
The rear bumper frame, as the supporting structure of the bumper, whether its replacement affects safety depends on the degree of damage and the repair process:
If the frame is only slightly deformed or partially damaged, replacing it with original factory or high-quality parts and having it installed by a professional repair shop will have a relatively small impact on the vehicle's safety performance and may even restore its original protective capability.
However, if the frame is replaced as a whole due to a severe collision and the maintenance involves cutting or welding of the vehicle body, it may weaken the structural strength of the vehicle body, affect the energy absorption efficiency during a collision, and thereby reduce safety.
Youdaoplaceholder0 vehicle value impact
Replacing the rear bumper frame may have a negative impact on the value of a used car, but the extent varies depending on the situation:
Youdaoplaceholder0 Replacement reason : If the replacement is caused by an accident impact, the vehicle may be classified as an "accident vehicle", with a significant depreciation. If it is replaced due to normal aging or minor scratches, the impact will be relatively small.
Youdaoplaceholder0 Maintenance techniques and accessories : Using original factory parts and professional installation can minimize value loss to the greatest extent; Conversely, counterfeit parts or rough craftsmanship can lead to an uncoordinated appearance and excessive gaps, further exacerbating depreciation.
Youdaoplaceholder0 vehicle brand : the value weight of original parts for high-end models is high, and the depreciation is more obvious after replacement. The impact of mid-to-low priced models is relatively limited.
Youdaoplaceholder0 Accident classification determination
Whether the replacement of the rear bumper frame falls under the category of "major accident vehicles" requires a comprehensive assessment:
The frame and the body are connected by bolts and are not an integrated structure. Simple replacement does not automatically define it as a major accident. The key lies in whether the body is damaged.
If the replacement only involves local repair of the frame and no cutting or welding of the vehicle body, it is usually regarded as a minor accident. If the frame is severely deformed and needs to be replaced as a whole, accompanied by damage to the vehicle body, it may be determined as a major accident vehicle.
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