Automatic locking screw machine quality appraisal

automatic screw locking machine takes the synergy of high-precision positioning and torque control as its core principle. By optimizing the supply stability, screw locking accuracy and torque control error, it achieves the synergy of screw locking qualification rate, production efficiency and equipment reliability. It is widely used in automated assembly lines of 3C electronics, automotive electronics, home appliances and precision instruments. In the assembly of mobile phone motherboards, it is used for anti-slip tooth locking of micro screws below M1.4; in the field of automotive controllers, it meets the anti-overload requirements of high-torque screws; in multi-variety mixed line production, it ensures the accuracy of automatic identification of screw models. Compared with traditional equipment, automatic screw locking machines have features such as intelligent error-proofing, multi-axis collaboration and data traceability (torque/angle recording of each screw), and are the core equipment of intelligent manufacturing.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide quality appraisal services for automatic screw locking machines. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for the quality appraisal of automatic screw locking machines.

As precision assembly requirements increase, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: the locking qualification rate is not up to standard, and the torque is out of tolerance;

2, material defects: the life of the electric batch spindle bearing, the wear-resistant coating of the feed track is peeling off;

3, process problems: visual positioning repeatability, supply air pipe pressure fluctuation;

4, contract performance dispute: core modules (such as imported electric batch servo systems, high-precision torque sensors) are inconsistent with the technical agreement.

According to the characteristics of automatic screw locking machines, common quality identification technical methods include:

1, appearance inspection method

Appearance inspection method is a simple and intuitive identification method. By observing the appearance of the equipment, we can find whether there are obvious damage, deformation, wear and other problems on the equipment. For example, check whether there are cracks in the casing of the device, whether the screws are loose, whether there are obvious signs of wear on the mechanical parts, etc. Visual inspection can provide clues for further inspection and analysis.

2, performance testing method

The performance testing method is an important method to identify the quality of non-standard equipment of automatic screw locking machines. By testing various performance indicators of the equipment, we can accurately understand the actual operation of the equipment. For example, performance indicators such as screw tightening torque, locking position accuracy, and feeding speed are tested, and the test results are compared with the technical contract and relevant standards to determine whether the equipment meets the requirements.

A mobile phone OEM factory of the applicant signed a "Purchase Contract for M1.2 Automatic Screw Locking Machine" with an equipment manufacturer of the respondent, and it was agreed that the thread slip rate is ≤0.01%. After being put into production, the thread slip rate reached 0.5%. The manufacturer argued that it was caused by uneven hardness of the incoming screws.

identification analysis results:

The quality analysis expert group discussed and synthesized the relevant information of the "automatic screw locking machine", contract technical agreement, on-site inspection case materials and other data Technical analysis, the following quality analysis opinions are made:

The electric screwdriver torque calibration error of the automatic locking screw machine involved in the case is +7% (agreement ±3%), the visual positioning repeatability accuracy is ±0.08mm (agreement ±0.03mm); the feeding track coating hardness HV 550 (agreement ≥800), resulting in skewed screw delivery.

The appraisal conclusion concluded that equipment control accuracy and material defects are the main causes of tooth slippage.

Automatic locking screw machine quality appraisal report should include:

1, appraisal purpose (such as production loss attribution, technical compliance verification) and reference standards;

2, involved equipment model, control system version, process parameter record;

3, detection method and equipment List (such as torque tester, high-speed camera);

4, detection data and failure correlation analysis (such as the impact of torque error on tooth slip rate);