Quality Control

Mollificio Valli has always pointed to its Quality to attain satisfaction of its clients.

In 2002 it converted the certificate for ISO 9002:1994 into ISO 9001:2000 and in 2005 there followed the certificate according to the technical specification ISO/TS 16949 for suppliers in the AUTOMOTIVE sector.

In the same manner, the department for Quality Control evolved, with cutting edge technology whether in terms of specific checks on the springs, or, more generally, for dimensional checks of any type of article.

With regard to the instruments for checking the springs, Mollificio Valli has available:

• 9 load testers able to cover all possible requests from our clients: the various load cells reach from a few grammes up to 1000 kg, with resolutions of 0.1 g for machines of 3 kg, 1 g for those of 50 kg, etc.;
• 1 load testers to cover selection operations at 100% on load and length;
• 1 machine for verification of the additional characteristics such as perpendicularity (E1) and parallelism (E2), with high repeatability and precision in the order of 0.01 mm;
• 1 torquemeter for verification of load and torsion.

Moreover, to guarantee the accuracy of the results obtained, Mollificio Valli, trusts Microstudio®, leading manufacturer in Europe in the sector of measuring machinery for springs, in all matters concerning acquisition, assistance and calibration. Microstudio has always been involved in the development of projects suitable to meet specific client requests (e.g., calibration and selection machinery to 100%).

For the dimensional verification the Quality control laboratory has available a machine for three-dimensional checks with keyboard and an optical machine (able to measure by means of the analysis of shadow on the area being checked), which is principally used for two-dimensional measurements.
Both of these can be programmed and are therefore able to repeat a test in a short time on further pieces according to a sequence which has been pre-programmed by the operator. Both of these were manufactured by Mitutoyo® and accurate to less than 0.01 mm.

The set of instruments is completed by a simple profile projector, a digital durometer and a large number of bench instruments such as micrometers, comparators and calibrators, the latter being available to all workers in the production departments.

For the verification of the operation of the springs, there are high-velocity machines to verify fatigue in the items.
The controls are rigorous in order to guarantee the quality of the prime material used, the controls in production and the final tests, the number and frequency of which is guaranteed by control panels purposely created or, failing this, is able to ensure a level of Quality LQA (according to norm UNI ISO 2859-1) to at least 0.65.

Finally, from the point of view of the Quality documentation, in accordance with the certification according to the technical specification ISO/TS 16949, Mollificio Valli is able to compile anything necessary to complete and present a PPAP: FMEA, control panel, R&R, APQP, PSW, etc.