1. External Assessment
The inspection of finished tires first depends on whether their appearance is qualified. Any appearance defects that affect tyre life, such as delamination between parts of the tire, sponge-like, severe traveling of the traveler, broken wire, and cords at the tire crown All are unqualified products. In general, there are many factors that affect the appearance and quality of radial tires:
The circumferential rubber edge of the crown cannot be too large, the crown circumference is grooved, the pattern edges and corners are round, the pattern is bursting, the foreign matter marks, bubbles or damage on the crown shoulder surface,
Heavy skin, damage, cracks, and joints on the side, lack of rubber on the side, foreign marks and air bubbles,
The inner side of the bead is uneven, the cord is exposed on the outer side of the bead, the cloth is pleated and warped, damaged, lack of rubber, heavy skin, cracks, the width of the bead varies, and the toe is out of the edge.
Tire cord cracks, tire cord bends, tire cord breaks, unevenness in the tire, impurity marks, open inner liner joints, exposed cords, deformation of the carcass or bead, etc.
2. X-ray Detection
The purpose of X-ray inspection is to determine the integrity of its internal structure. The tire X-ray inspection system can detect common defects such as carcass cord breaks, cord splits, crossovers, poor joints, bead material distribution, etc., belt level differences, voids, and air bubbles.
Generally speaking, an X-ray inspection system can include 4 basic components: an X-ray generator, a tire manipulation or delivery system, a camera system, and an X-ray protection room. Each part plays an important role in the function of the system. The purpose of the camera system is to capture images and transfer them to user interface equipment for operator analysis and identification
Quality risks controlling program:
The quality control plan is an operable plan that can ensure that the product (quality inspection of raw materials, rubber materials, semi-finished products and the entire process of quality production) is under controlled, and evaluate quality level of each production stage and the product itself through detailed data processing.
Tire quality controlling is divided into two main parts: the first part needs to check the characteristics (Mooney viscosity, size, weight, temperature, etc.), standards, corresponding tolerances, inspection time and place, and the test equipment used.
The second part is the inspection frequency of self-control, supervision inspection and information inspection. In order to keep the production process under control, self-control should be implemented by the operator. The quality inspector of the quality inspection department supervises and inspects the implementation, the purpose is to supervise and inspect all equipment parameters, process conditions, and their own semi-finished product control. If any non-conformities are found during the supervision and inspection, they must be rectified immediately. Informational inspections are performed by professional quality personnel (quality inspectors and process personnel), and the production process and product quality charts for the month are analyzed by inspection data.
Through sufficient inspection and analysis, necessary revisions will be made to the controlling plan, additional inspections of key points in the process will be conducted, and potential quality hazards will be evaluated and continuously improved.
Firstly, establishing a quality controlling point
In accordance with the production process, strengthen the quality process control, establish "quality control points" in key positions, carry out special management and controlling of rubber, semi-finished products and manufacturing processes, statistics and analysis of quality problems in the production process, analyze and improve key process capabilities, whether quality problem analysis and corrective actions are performed in accordance with standardization.
Mixing workshop controlling station:
1.Mixing controlling point and monitoring range
1.1. 8 quality control stations in the mixing workshop: pharmaceutical preparation, rubber compound rapid inspection (masterbatch, final rubber quality), controlling scope and items (see attached table).
1.2. There are 19 quality control stations in the workshop: 1, 2, 3 # double composite, inner lining.
1.3, 10 quality controlling stations in the calendering shop, zero degrees, oblique cutting, straight cutting, traveler manufacturing.
1.4, 5 quality controlling stations in the molding workshop: molding machine, tire appearance.
1.5, 4 quality controlling stations in the vulcanization workshop: vulcanizing machine.