This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of steel wire hairpins. QB/T 1814-1993 Steel wire hairpins QB/T1814-1993 Standard download decompression password: www.bzxz.net

Light Industry Industry Standard of the People's Republic of China
Subject content and scope of application
QB/T 1814--1993
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of steel hairpins. 2 Reference standards
GB/T2828 Count sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches) GB/T2829 Count sampling procedures and sampling tables for periodic inspection (applicable to inspection of production process stability) GB5938 Corrosion resistance test method for metal coatings and chemical treatment layers of light industrial products Neutral salt spray test (NSS) method GB5944
Evaluation of corrosion test results of metal coatings of light industrial products 3 Product classification
Product structure and names of each part
The schematic diagram of product structure and the names of each part are shown in Figure 1. Figure 1
1-end; 2-front contact point; 3-upper leaf; 4-lower leaf 3.2 Product type
3.2.1 Products are divided into six types: flat type, wave type, leaf type, flower type, twist type and hook type, see Figure 2, and the codes are shown in Table 1. Glycolic acid:
a. Plane type
Approved by the Ministry of Light Industry of the People's Republic of China on 1993-07-29 Figure 2
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b. Wave type
00900000
Implemented on 1994-03-01
Product type
Model code
x2 mD23
Heart, twist type
Plane type
QB/T 1814 1993
Continued Figure 2
Wave type
3.2.2 The product ends are divided into beaded ends (Q) and non-beaded ends. 3.3 Product marking
Standard number
Bead head code
Twist type
Design serial number (expressed in Arabic numerals) Length Lmm
~Type code
Product name code
Marking example: GFB50-1QQB/T1814
The first design length is 50mm. Bead head wave wire hairpin. Technical requirements
4.1 Dimension requirements
The extreme deviation of product length L shall comply with the provisions of Table 2. Table 2
Length size
Limit deviation
Valve head distance (elasticity)
End head distance (fatigue performance)
4.2 Use requirements
4.2.1 Elasticity
Except for the hook type, the product shall return to its original state after the elasticity test. >60
4.2.2 Fatigue resistance
Except for the hook type, after the fatigue performance test, there shall be no gap at the front contact point or surface of the product. 4.2.3 Clamping requirements
There shall be no gap at the front contact point of the hairpin or the contact surface shall not be less than one-third of the length. 4.3 Corrosion resistance
After the paint product has been subjected to the neutral salt spray test for 8 hours, the corrosion resistance level of its substrate shall not be lower than level 6; after the electroplating product has been subjected to the neutral salt spray test for 4 hours, the corrosion resistance level of its substrate shall not be lower than level 3. b.
4.4 Paint film firmness
The paint film should be firm, and after the paint film firmness test, the paint film shall not peel or fall off. 4.5 Appearance requirements
4.5.1 The product shape should be correct. Except for the hook shape, the upper and lower leaves of the hairpin should overlap. 4.5.2 There should be no rust on the inside and outside of the hairpin.
4.5.3 The outer surface of the painted product should be bright in color, without paint stains, paint flow, wrinkles, exposed bottom, and no obvious scratches, bubbles, or pits. 4.5.4 The outer surface of the electroplated product should be bright and uniform in color, without bubbles or peeling. 4.5.5 The end of the hairpin should be smooth, and the burr of the cut should not be greater than 0.1mm. The size of the upper and lower leaves of the beaded hairpin should be basically uniform, and the bead should not be loose or have obvious exposed corners, bubbles, or pits. 5 Test method
5.1 Dimension measurement
The length, end distance, and cut burr are measured with a vernier caliper. 5.2 Elasticity test
According to the distance specified in Table 2, pull the two leaf ends apart by hand and open and close them 5 times continuously. 5.3 Anti-fatigue performance test
According to the distance specified in Table 2, use a special tester to pull the two leaf ends apart for 1200 times continuously. 5.4 Corrosion resistance test
Neutral salt spray test is tested according to GB5938 and evaluated according to GB5944 method. 5.5 Paint film firmness test
Unfold the two leaves of the hairpin, bend the lower leaf on a metal rod with a diameter of d5mm, and the angle is greater than 180°. Use a fingernail to gently scrape the top of the bend - times. 5.6 Clamping requirements and appearance
Carry out visual inspection under the illumination of 40W fluorescent lamp at a distance of 750mm. 6 Inspection rules
6.1 Products must be inspected and qualified by the manufacturer before they can leave the factory. 6.2 Product inspection is divided into factory inspection and type inspection, and the number of unqualified products per 100 units of products is used for inspection. 6.3 Factory inspection
6.3.1 Factory inspection shall be carried out in accordance with GB/T2828, and a normal inspection sampling plan shall be adopted. The inspection items, non-conforming classification, qualified quality level and inspection level are shown in Figure 3.
Inspection items
Clamping requirements
Length
Appearance requirements
Technical requirements
Test methods
Non-conforming classification
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Qualified quality level (AQL)
Inspection level IL
QB/T 1814-1993
6.3.2 When the batch is determined to be qualified after the factory inspection, the delivery party shall replace the non-conforming products with qualified products before submission; when it is determined to be unqualified, the batch of products shall be reworked and sorted by the delivery party before it can be submitted for inspection again. 6.4 Type inspection
6.4.1 Type inspection should be carried out in any of the following situations. a.
Type identification of new products or old products transferred to the factory for production; after the product is put into production, when there are major changes in structure, materials, and processes that may affect product performance; when the product is discontinued for more than half a year and production is resumed; when the superior quality supervision agency or the competent unit proposes a requirement for type inspection; during normal production, it should be carried out once a year.
Type inspection shall be carried out in accordance with the provisions of GB/T2829, using a single sampling plan with discrimination level. The samples are drawn from the qualified batches after the factory inspection. The inspection items, unqualified classification, unqualified quality level, judgment array and sample size are shown in Table 4. Table 4
Inspection items
Clamping requirements
Film firmness
Length dimension
Fatigue performance
Corrosion resistance
Corresponding chapters and clauses
Technical requirements
Test method
【Rejection quality level (RQL)
Rejection classification
Judgment array
Judgment according to GB5944
Sample size n
One time, and with the permission of the superior quality department, re-inspection can be carried out. If the product is judged as unqualified after type inspection, the following circumstances occur: When the test equipment failure or operating error affects the inspection result; When the inspected unit requests re-inspection;
When the enterprise takes necessary technical measures.
7 Marking, packaging, transportation, storage
7.1 Marking
7.1.1 The inner packaging shall be printed with the manufacturer's name, product name, model, trademark, and standard number. 7.1.2 The outer packaging box shall be printed with the manufacturer's name, product name, model, article number, trademark, quantity, gross weight, volume, date of manufacture, and standard number. 7.2 Packaging
7.2.1 Inner packaging
The inner packaging can be packed with cardboard, paper box or plastic bag. 7.2.2 Outer packaging
Box packaging is divided into two types: paper box and wooden box. Both are moisture-proof and firmly wrapped. The product certificate shall be attached. 7.3 Transportation
During transportation, it is strictly forbidden to expose to rain and moisture. Be careful when moving and do not mix with corrosive items. 7.4 Storage
7.4.1 The finished product warehouse should be ventilated and dry, with a relative humidity of less than 85%. The box should be at least 200mm from the ground. There should be no corrosive gas in the warehouse and it should not be stored in the open air. Www.bzxZ.net
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QB/T 1814- 1993
If the product meets the requirements of 7.3 and 7.4.1 and is not unpacked, the storage shelf life is: one year for painted products and half a year for electroplated products. 7.4.2
Additional Notes:
This standard is proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Daily Hardware Standardization Center. This standard was drafted by Shanghai Hairpin Factory and Beijing Hairpin Factory. The main drafter of this standard is Yu Hongwei.
From the date of implementation of this standard, the former Ministry of Light Industry Standard SG370-1984 "Wire Hairpin" will be abolished. 399
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