quality & technology

dotz in perfection


The highest quality standards in wheel design

The product strategy of DOTZ is to deliver wheels that adhere to the highest possible quality standards. We subject our wheels to a number of tests and processes to ensure that these high quality standards are met.

It starts by perfectly organising our wheel design development. All of our production partners (also subject to mandatory ISO 9001 certification) share our high quality standards as well. During production, we continuously test our wheels to make sure that they conform to size specifications and that the materials are homogenous. We also carry out a factory exit check to ensure that the wheels are of proper density and are free from visible defects. Before delivery all DOTZ alloy wheels undergo stress tests involving 200,000 load cycles performed by TUEV. An impact test is also carried out simulating a collision with a curb stone.

Only when our wheels pass all of these tests they are delivered to our customers all over the world from our distribution warehouse in Siegburg (Germany).

These tests, coupled with our untiring efforts to continually develop all of our designer wheels on the market, form the cornerstones of AEZ’s quality assurance policies. In so doing, we are able to meet the demands of our customers and make the highest engineering standards compatible with attractive wheel designs.

ISO Certificate 9001

ALCAR Wheels GmbH, who developed and distribute the wheel brand DOTZ, are certified for their quality management by the German technical certification institute TÜV. This certification is renewed on an annual basis and guarantees continuous improvements in the development of our wheel designs and in customer service.


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design   & construction

the wheel-development

The rim is created using computer-aided design (CAD) software while the finite element analysis (FEA) simulates deformations during operation. In this way, important details be determined realistically.

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production   & technologie

production of alloy rims

DOTZ light alloy rims are manufactured using the permanent mold casting method. Once the wheel is cast the mold is removed and each wheel reworked and finished hand-made.


One Piece Wheels

The casting of wheels is the process of getting molten aluminium inside a mold to form a wheel. This can be accomplished in many different ways, yet isn´t as simple as it sounds. But with attention to detail can yield great results. This is the most common type of aluminium wheels.

Casting

This is the process of pouring molten aluminium inside a molt to form a wheel. While some manufacturers simply use Earth´s gravity to pour the molten aluminium, others employ pressure systems to either inject or suck the molten aluminium into a cast. Once the wheel has been molded, it is then removed from the cast and finished.

Spun-Rim, Flow-Forming Or Rim Rolling Technology

This process begins with a low-pressure type of casting. A special machine then spins the initial casting, heats the outer portion and uses steel rollers pressed against the rim area to pull the rim to its determined width and shape. This process yields a rim area similar in strength to a forged wheel, yet not as costly. Some OEM high-performance or limited production vehicles utilize special wheels with this type of technology, resulting in a light, strong wheel at a reasonable cost.

Forged Wheels

Forging is the process of forcing a solid billet of aluminium between the forging dies under an extreme amount of pressure. This extracts unwanted elements, making the metal less porous and changes the metal´s grain flow into the shape of the wheel, making it stronger than cast or machined metal parts. It is also very light. However, the process and equipment comes at a high cost.

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QUALITY AND SAFETY AT THE HIGHEST LEVEL

DOTZ SURVIVAL supplies off-road wheels of the highest quality. This requires several steps and control processes to ensure that our wheels meet the highest quality standards. Starting with perfectly organized wheel development, whereby the wheels are already during the development phase by using finite element analysis are optimized in terms of weight and strength and later during the production process are checked for strength, dimensional accuracy and material properties , right through to renewed testing of all geometric and optical properties at the end of production.

All wheels are tested in advance by the TÜV for maximum loads in accordance with the German wheel or ECE guidelines. Even under extreme operating conditions, these test assumptions are never achieved in actual vehicle operation.

In the course of this, our steel wheels are tested with increased load on a rotating bending test facility. The wheel is subjected to 60.000 load cycles. Subsequently, the steel wheel is loaded with only slightly increased test load and about 600.000 load cycles. Our wheels are also subjected to a rolling test. In this test, the wheels are loaded on a further testing device and must withstand depending on tire dimension approximately further 500.000 load cycles. After all these test runs, the rim must not show even the slightest deviation! After positive completion of all test phases and approval by the KBA (German Federal Motor Transport Authority), our off-road steel rims are delivered to our customers worldwide.

Our internal quality standards, the test procedures, the continuous development and the long-time reliable performance of all our DOTZ 4x4 Survival wheels result in a high customer satisfaction.

ISO certificate 9001

The company ALCAR Wheels GmbH, which develops and distributes the brand DOTZ SURVIVAL, has been awarded the ISO 9001 certificate by the TÜV for its quality management. This certificate is confirmed every year and ensures consistent quality in the production processes and in customer service.

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Flowforming

It is an optimization of the rim manufacturing process, which allows a further reduction of mass with a relatively increasing strength. The starting material of the rim is then rolled to the respective rim width by steel rollers which are pressed against the side surface.

Welding process

Our off-road wheels are produced on the same lines as our standard car wheels. By welding with 4 guns at the same time, the heat effect and the associated deformation can be significantly reduced. This enables us to ensure that our off-road wheels also run as smoothly as normal car wheels.

Cataphoretic dip primer

In this electrochemical process, an organic paint layer is applied to our steel wheel in an immersion bath. The formula improved by Alcar enables a thicker cataphoretic layer to be applied to the edges of the aeration holes and rim flanges. This increases the resistance of our off-road wheels to a maximum.

Special paintwork

Our special, elastic topcoat enables high end protection under extreme off-road conditions.

dotz wheels