Inspection Classification of compression gas spring

Posted by: harry | on February 25, 2025

8.3 Inspection Classification

Product inspections are divided into factory inspections and type inspections.

8.3.1 Factory Inspections
All products must undergo final inspections before delivery. The inspection items are shown in Table 5.
| Inspection Items | Inspection Type | Inspection Methods and Requirements |
|—|—|—|
| Specified Force Value | Mandatory Inspection | Shall comply with the provisions of Table 2 |
| Appearance | Mandatory Inspection | Conducted according to 7.1.2, shall comply with the provisions of 6.1.3 – 6.1.5 and 9.1 |
| Extended Length | Sampling Inspection according to 8.2 | Conducted according to 7.1.1, shall comply with the provisions of 6.1.2 |
| Force Characteristic Curve | Sampling Inspection according to 8.2 | Conducted according to 7.2, shall comply with the provisions of 6.2 |
8.3.2 Type Inspections
Type inspections shall generally be carried out under any of the following circumstances:
- a) When new products or old products are transferred to production and undergo finalization appraisal;
- b) When there are major changes in product design, structure, materials, or processes;
- c) When there are major changes in key process equipment or personnel;
- d) After a certain period of normal production of series products;
- e) When major quality problems occur in products;
- f) When products are out of production for more than one year and then resume production;
- g) When there are significant differences between the results of factory inspections and the previous type inspections;
- h) When the national quality supervision agency requires type inspections.
  The type tests in d) and h) shall be carried out according to 8.2. Other type inspections shall be carried out in accordance with the provisions of GB/T 2829. 6 gas springs are sampled and divided into 3 groups, with 2 gas springs in each group. The inspections are carried out as shown in Table 6.
  | Group | 1 | 2 | 3 |
  |—|—|—|—|
  | Inspection Items | Force characteristics 6.2, High and low temperature resistance performance 6.4, Cycle life 6.5, Tensile resistance performance 6.6
  Corrosion resistance performance 6.7 | Dimensions 6.1.2
  Appearance quality 6.1.3, 6.1.4, 6.1.5
  Safety identification 9.1 | – |
  | Number of Samples | 2 | 2 | 2 |
  | Discrimination Level | I | I | I |
  | Judgment Array | [0,1] | [0,1] | [0,1] |
  | Unqualified Quality Level (RQL) | 40 | 40 | 40 |