According to the common process of sheet metal processing, it is normal to control the laser cutting accuracy at about 0.10 mm, bending accuracy at 0.20~0.30 mm, and welding accuracy at 0.30~0.50 mm. "Precision sheet metal processing" has high requirements on the dimensional accuracy of parts and the beauty of appearance surface treatment, and the high accuracy requirement of bending dimension tolerance of ± 0.10mm is its characteristic. For sheet metal processing, which is difficult to predict the processing accuracy due to the impact of material rebound, the technology of skilled workers is usually integrated into the machine software programming to achieve "precision sheet metal processing".

1、 Analysis of product quality fluctuation

We may as well start with the analysis of specific processes and products to find out the quality fluctuation of sheet metal products. First, let's list the general processes of sheet metal processing: blanking, cutting, bending, welding, surface treatment, assembly and packaging.

According to the process analysis, the process quality is affected by six factors, namely, human, machine, material, method, environment and measurement. The following six aspects are the reasons for the quality fluctuation of sheet metal products:

(1) Operator's knowledge of quality, technical proficiency and physical condition;

(2) Accuracy and maintenance status of machine equipment and fixture;

(3) Composition, physical properties and chemical properties of materials;

(4) Including sheet metal processing technology, welding tooling selection and assembly operation procedures;

(5) Whether the measurement method is standard and correct;

(6) Temperature, humidity, lighting and cleaning conditions of the work site.

2、 Measures to strictly control product quality

1. Man-operator factor

The operators have poor quality awareness, careless operation, do not follow the operating procedures, low operating skills, unskilled skills, and boredom due to simple and repetitive work.

The controllable measures to prevent defects include: ⑴ strengthening the establishment and improvement of quality responsibility system; ⑵ Compile clear and detailed operation procedures, and strengthen professional training of process; ⑶ Strengthen the "three inspections" and appropriately increase the frequency of inspection (including self-inspection); (4) Through personnel adjustment between different types of work, work experience enrichment and other methods (training versatile workers), eliminate the boredom of operators, promote self-improvement and enhance self-improvement ability.

Our company has skilled and highly skilled processing operators, and will irregularly carry out quality and technical assessment and training for operators!

2. Machine-machine factor

The main control measures are as follows: ⑴ Strengthen the maintenance and repair of equipment, regularly test the key accuracy and performance items of equipment, and establish a daily spot inspection system for key parts of equipment to control the equipment at the process quality control point; ⑵ Use the first article inspection system to verify the adjustment of the positioning or quantitative device; ⑶ Use CNC machine tools as much as possible to reduce the dependence on the reliability of workers' operation; ⑷ Gradually establish the equipment management system to achieve good equipment performance.

Our company has an efficient and comprehensive imported sheet metal processing system and advanced technical support, which can meet a series of production requirements in sheet metal processing!

3. Material-material factors

The main control measures include: ⑴ specify the quality requirements when purchasing raw materials; ⑵ Strengthen the incoming inspection of raw materials; ⑶ Reasonable selection of suppliers; ⑷ Do a good job of cooperation with users and help users do a good job of quality control and quality assurance.

All the raw materials of our company are purchased by large manufacturers, and the quality is guaranteed!

4. Method - sheet metal processing technology

The process method includes the arrangement of process flow, the connection between processes, the selection of process processing means and the preparation of process processing guidance documents. The influence of process method on process quality mainly comes from three aspects: first, the correctness and rationality of the process method, the selected process parameters and process equipment; Second, the seriousness of implementing process methods; The third is to supervise the implementation of the process between departments.

The process method constitutes the technical content of the product. The reasonable process will reduce the product cost and improve the qualification rate. It can be said that the reasonable process plus the correct production and operation process constitute the qualified product.

Our company has a clear and perfect sheet metal processing system, strictly controls the processing quality, and provides users with high-quality services!

5. Measurement - factors of measurement

The main control measures include: ⑴ determining the measurement task and the required accuracy, and selecting suitable test equipment with the required accuracy and precision capability; ⑵ Confirm, calibrate and adjust all measuring and testing equipment regularly; ⑶ Specify necessary calibration procedures, including equipment type, number, location, calibration period, calibration method, acceptance method, acceptance standard, and measures to be taken in case of problems; (4) Keep calibration records; ⑸ If the measuring and test equipment is not in the calibration state, immediately evaluate the validity of the previous measuring and test results and record them in the relevant documents.

6. Environmental factors

The so-called environment generally refers to the temperature, humidity, noise interference, vibration, lighting, indoor purification and on-site pollution degree of the production site. In addition to ensuring the special requirements of products on environmental conditions, we should also do a good job in site sorting, rectification and cleaning, vigorously do a good job in civilized production, and create conditions for lasting production of high-quality products.