Assembly robot quality appraisal

The

assembly robot takes high-precision motion control and multi-sensor fusion as its core principles. By optimizing joint repetitive positioning accuracy, end load capacity and dynamic response speed, it achieves efficient execution of complex assembly tasks, flexible production and process stability. It is widely used in automobile manufacturing, 3C electronics, aerospace and medical equipment and other fields. In the automobile production line, it is used for engine block tightening and door sealant coating; in the electronics industry, it meets the micron-level precision requirements for chip mounting and screen assembly; in the medical field, it ensures the sterile assembly of surgical instruments. Compared with traditional industrial robots, assembly robots have characteristics such as collaborative safety, visual guidance accuracy, and digital twin synchronization. They are the core equipment for flexible upgrades in intelligent manufacturing.

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

With the popularization of intelligent manufacturing, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: excessive repetitive positioning accuracy, insufficient maximum load capacity;

2, material defects: harmonic reducer flexspline fatigue life, collaborative arm surface force sensing

3, process problems: excessive temperature rise of the servo motor causes torque attenuation and vision system calibration failure;

4, contract performance dispute: core modules, software functions and technical agreements do not match.

0 Such cases need to pass kinematic calibration, dynamic performance testing and software and hardware collaborative verification to clarify the quality responsibility.

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1. Appearance inspection

Visually inspect the equipment for obvious defects, such as scratches, deformation, damage, etc.

2. Performance test

evaluates core performance indicators such as accuracy, speed, and repeatable positioning capabilities based on the technical parameters of the equipment.

3. Function detection

0 Check the normal operation of each functional module of the equipment, including robot arm movement, end effector operation, sensor identification, etc.

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24. Safety check

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4Evaluate the safety protection measures of the equipment, such as emergency stop buttons, safety doors, collision detection, etc.

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65. Disassembly and inspection

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8If necessary, disassemble the equipment and check the quality of key components and whether there are defects.

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The applicant, an automobile manufacturer, and the respondent, a robot company, signed a "Door Assembly Robot Procurement Contract", agreeing that the repetitive positioning accuracy is ±0.03mm. After being put into production, the door hinge hole position deviation exceeded 0.1mm. The manufacturer argued that it was caused by the error of the body positioning fixture.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "assembly robot", the contract technical agreement, the on-site inspection case materials and other data, and made the following quality analysis opinions:

The 4th axis of the assembly robot involved in the case has a repeatability accuracy of ±0.06mm (agreement ±0.03mm), a harmonic reducer backlash of 1.2 arcminutes (agreement ≤0.5 arcminutes), and uneven reflectivity of the visual calibration plate (difference between center and edge >15%), resulting in a feature point matching error of 0.5px.

The appraisal conclusion determined that defects in mechanical transmission and vision systems were the main causes of assembly out-of-tolerance.

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Assembly robot quality appraisal report should include:

1, appraisal purpose (such as accuracy dispute attribution, functional compliance verification) and reference standards (GB/T 12642, ISO 10218, etc.);

2, the robot model involved, control system version, operation and maintenance records;

3, detection methods and equipment list (such as laser tracker, six-dimensional force sensor);

4, detection data and failure correlation analysis (such as the impact of reducer backlash on positioning error);

05, clarify the quality responsibility judgment conclusion and technical basis;

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26, signature of the appraiser, professional robot qualification certificate and official seal of the organization.

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