In the field of screw production, surface defects are a key issue affecting product qualification rates. Defects such as scratches, crush injuries, and burrs not only reduce the assembly accuracy of screws but may also lead to a decline in rust resistance, ultimately affecting the service life of end products. In traditional production modes, the stamping forming and thread rolling processing of screws often rely on manual operations or semi-automatic equipment. Due to problems such as uneven manual feeding force, mold alignment deviations, and unstable processing rhythms, the surface defect rate usually remains at 3%-5%, becoming a "quality pain point" for manufacturing enterprises. The emergence of automatic thread rolling machines provides a systematic solution to this problem.

The core of the improvement in surface defects by automatic thread rolling machines lies in "process standardization" and "precision control of parameters". In the stamping process, the equipment drives the feeding mechanism through a servo motor to ensure that the position error of each blank entering the mold does not exceed 0.02 mm, avoiding "edge crush injuries" caused by positioning deviations during manual feeding. In the thread rolling process, the pressure sensor equipped in the automatic equipment can real-time monitor the contact force between the thread rolling wheel and the screw. When the force exceeds the preset threshold, it automatically decelerates and adjusts, fundamentally reducing "thread surface scratches". More importantly, the built-in visual inspection module of the equipment can immediately scan the surface of the screw after processing. When a defect is found, it automatically triggers the sorting mechanism to immediately remove unqualified products, preventing them from flowing into the next process.

After introducing the fully automatic stamping and thread rolling machine, the surface defect rate of its screws has dropped from 4.2% to 0.8%. In addition to the precision advantages of the equipment itself, the "stable processing environment" brought by automatic production is also crucial. The closed processing chamber of the equipment reduces the adhesion of external dust, and the constant temperature control system avoids differences in material ductility caused by temperature changes. These details together constitute the guarantee of "low defect rate". In addition, the automatic mold lubrication system of the equipment can accurately spray lubricating oil according to the processing frequency, which not only avoids "oil residue defects" caused by uneven manual lubrication but also reduces the waste of lubricating oil, achieving dual optimization of quality and cost.

For manufacturing enterprises, the value of reducing the surface defect rate is far more than improving the qualification rate. In fields such as new energy vehicles and precision instruments that have extremely high requirements for screw quality, every 0.1% reduction in the defect rate means an approximately 8% reduction in the risk of returns from downstream customers. The "quality stability" formed by automatic thread rolling machines through equipment optimization is becoming the core competitiveness for enterprises to obtain high-end orders.