The high quality of Pronar Wheels has made their wheels applicable, among others in trailers, construction, industrial, forestry and military machinery.
The wheels produced in Pronar meet the international requirements of ETRTO, EUWA and ISO. In accordance with the assumptions of the “Quality Policy” – the document adopted by the management of Pronar, the company aims to provide buyers with the highest quality products and services. Pronar achieves a high level of customer satisfaction and satisfaction, among others thanks to the use of the Integrated Management System. Caring for the high quality of products begins with a thorough quality control provided by the material suppliers.
By controlling at individual stages of the production process and ending with a random checks of the finished product. A very important factor in the production of wheels is the employees who undergo an appropriate training process. It depends on them what dimensions the products will have. Employees at individual stages of production check their parameters, and the correct setting of machines is supervised by foremen and others.
In case of implementation of new products, the employees of the Technological Department and the Production Department carry out technological tests under the supervision of the Quality Control Department.
Wheels are a key element for safe driving, so they require a very complex, multi-stage and rigorously supervised production process. They are characterized by such parameters as: degree of resistance to pressures and resistance to loads resulting from their exploitation. PRONAR wheels are manufactured from a cut of metal sheet, which results in a strip corresponding to their width. The length of the belt, on the other hand, is the circumference of the wheel, which after conversion gives the diameter of the future wheel. A roll is a coiled strip of sheet metal of a certain width, from which, after the profiling process, the initial or final shape of the wheel will be formed. The length and width of the metal sheet strip is a standard value, which has an upper and lower deviation value. Then the metal strip (coil) is rolled up and welded, which gives it the shape of a circle.
The next step is to profile the coil. This is a very important process of creating a circle, during which the coil gets its intended shape. By selecting profiling rollers we determine the final parameters of the coil, such as: internal diameter, flange dimensions, etc. In parallel with the production of bare rims, discs and lugs are produced, which we also subject to the control process, according to the procedures adopted in the department. In the bare rims we measure: circumference by bead, inner bare rim diameter, their width, thickness and height and width.
In discs we measure: external diameter, disc thickness, central hole diameter, pitch circle diameter and bolt hole diameter. Therefore, if the inspected coil is qualified as compliant with the technical drawing and has the required parameters, we send it to the next production stand. When producing the lug wheel, it is important to correctly adjust the offset of the lug to the coil. The future track width of the machine depends on this setting.
Nowadays, most of the wheels are welded using automatic welding machines that press the disc into the bare rim. They measure the wheel run-out and connect the elements with the weld joint.
The Quality Control Department at the Wheels Department has the necessary technical documentation for each technological process and has the necessary measuring tools.
Pronar places great emphasis on the implementation and development of new measurement technologies. More and more often they are electronic devices, easier to use, enabling quick and accurate measurements. All measuring instruments are supervised by the Measuring Chamber, according to the procedure “Supervision of monitoring and measuring equipment”. In addition, we conduct an analysis of the MSA measuring system.
In addition, we conduct an analysis of the MSA measuring system.In solving quality problems, we also use various methods and quality tools, such as: MSA, CpK, Pareto Diagram and 8D report. They are mainly aimed at continuous improvement of quality procedures and processes based on the PDCA Deming cycle, which refers to quality management and consists in applying an appropriate approach to the implementation of specific activities and processes.
The employees of the Quality Control Department are also authorized to perform non-destructive testing VT1 and VT2. The scope of visual inspection mainly concerns the determination of surface defects.
Therefore, in order to prevent the occurrence of potential defects, the Quality Control Department takes corrective and preventive actions to eliminate possible noncompliances. These activities are analysed in detail by a team consisting of constructors, technologists, production masters and Quality Control Department employees. These relate to control plans and the FMEA (analysis of types and effects of possible errors).
When it is necessary to perform complex geometric measurements, requiring advanced measurement methods, we use measuring arms with a 3D laser projection system. The measuring arm is used to measure points in a three-dimensional coordinate system. The measurement of single points gives the possibility to measure geometrical features.