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GB 28011-2011 English PDF (GB28011-2011)

GB 28011-2011 English PDF (GB28011-2011)

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GB 28011-2011: [GB/T 28011-2011] Shanks for footwear [including MODIFICATION 1]

This Standard specifies product classification, technical requirements, test methods, inspection rules and marks, packaging, transportation, and storage for shanks for shoes (including boots). This Standard is applicable to steel shanks for shoes (including boots) made of metal materials.
GB/T 28011-2011 (Renamed from GB 28011-2011)
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 61.060
Y 78
GB 28011-2011
Shanks for footwear
[Including 2015XG1]
ISSUED ON: OCTOBER 31, 2011
IMPLEMENTED ON: AUGUST 01, 2012
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Product classification ... 4
5 Technical requirements ... 5
6 Number of specimens ... 7
7 Test methods ... 7
8 Inspection rules ... 10
9 Marks, packaging, transportation, storage ... 11
[2015XG1] Amendment 1 to GB 28011-2011 "Shanks for footwear" ... 13
Shanks for footwear
1 Scope
This Standard specifies product classification, technical requirements, test methods, inspection rules and marks, packaging, transportation, and storage for shanks for shoes (including boots).
This Standard is applicable to steel shanks for shoes (including boots) made of metal materials.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 191, Packaging and storage marks
GB/T 230.1, Metallic materials - Rockwell hardness test - Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T)
GB/T 2703, Footwear - Vocabulary
GB/T 3903.35, Footwear - Test methods for shanks - Fatigue resistance
QB/T 1813, Test Methods for Longitudinal Rigidity of Leather Shoes Shanks 3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 2703 apply.
4 Product classification
According to the object of use, it is classified into: male shoe shank, women's shoe shank, and children's (older) shoe shank.
According to the shape of the steel shank, it is classified into: type I shank, type L shank and type Y shank.
5 Technical requirements
5.1 Marks
The following shall be marked on the shank:
- Use object: "1" means shank for men's shoes, "2" means shank for
women's shoes and children's shoes;
- Applicable heel height or applicable heel height range, expressed in Arabic numerals, in millimeters.
Examples:
1/20 (shank for men's shoes, suitable for heel height of 20mm)
2/30~35(shank for women's shoes and children's shoes, suitable for heel height of 30mm~35mm)
5.2 Appearance
The surface of the shank shall be free of burrs and corrosion. The position of ribs, nail holes and forks shall be straight.
5.3 Size
5.3.1 Size tolerance
The length tolerance of the same batch of shanks is not more than ??2.0mm. The width tolerance is not more than ??1.0mm. The thickness tolerance is not more than ??0.2mm.
5.3.2 Lower limit of length
5.3.2.1 See Table 1 for the lower limit of the shank length of men's shoes. Table 1 -- Lower limit of the shank length of men's shoes
5.3.2.2 See Table 2 for the lower limit of the shank length of women's shoes and children's (older children) shoes.
5.7 Bending performance
The shank is subject to the 180?? bending test. The specimen does not break. The surface is allowed to have micro cracks.
6 Number of specimens
Take the shanks of the same material, the same specification, and a continuous production batch as a sampling batch. Randomly select 6 shanks as specimens, of which 2 shanks are used for the inspection of mark, appearance, size, longitudinal rigidity, hardness and bending performance, and the other 4 are inspected for fatigue resistance.
NOTE: The specimens used for longitudinal stiffness inspection and fatigue resistance inspection cannot be reused.
7 Test methods
7.1 Marks and sensory quality
Inspect visually under normal light.
7.2 Length measurement of steel shank
7.2.1 Length measurement of type I shank
Use a shoe tape ruler with an accuracy of not less than 1mm to get close to the upper surface of the shank. Measure the longest part of the shank, which shall be the shank length. The result retains integer digits. The length of each shank is expressed separately. The length tolerance is the difference between the maximum value and the minimum value in the measured value of the specimen. 7.2.2 Length measurement of type L shank
Place the shank on the platform as shown in Figure 1. Use a height gauge to measure and mark the highest point B of the shank. Use a shoe tape ruler with an accuracy of not less than 1mm to get close to the upper surface of the shank. Measure the distance from this point to the end of the head of the shank, which shall be the shank length. The result retains integer digits. The length tolerance is the difference between the maximum value and the minimum value in the measured value of the specimen.
keys:
1 - Base;
2 - Center column;
3 - Loading head;
4 - Loading rod;
5 - Point of support;
6 - Division circle;
7 - Steel shank;
8 - Roller.
Figure 2 -- Shank bending performance test
7.8.4 Test steps
The schematic diagram of the equipment is shown in Figure 2. The bending performance test is carried out according to the following steps:
a) Insert the steel shank into the point of support (see 5 in Figure 2), the center column (see 2 in Figure 2) and the roller (see 8 in Figure 2);
b) Make the upper surface of the middle part of the shank (the long side part of the type L shank test, except for the corner part) close to the center column (??10mm) as the point of support to do a 180?? bending test;
c) Visually inspect whether the shank is broken. Observe the cracks on its surface.
8 Inspection rules
8.1 Inspection of shank products
8.1.1 Batching
Products are inspected and accepted in batches. Continuously produced
products of the same model and specification can be used as an inspection lot. 8.1.2 Inspection classification
The product classification is divided into exit-factory inspection and type inspection.
8.1.3 Exit-factory inspection
Full inspection: marks and appearance. Random inspection: lower limit of dimension length, longitudinal stiffness, hardness, bending performance. Optional inspection: dimensional tolerance and fatigue resistance.
8.1.4 Type inspection
When inspecting all items, perform the mark, sensory quality, size, length lower limit, longitudinal stiffness and hardness test in order. Then select the shank with the largest hardness for the bending performance test. The other 4 shanks are tested for fatigue resistance.
In one of the following situations, type inspection shall also be carried out: a) When there are major changes in product structure, process, and
materials;
b) When the product resumes production after a long-term suspension of
production (three months);
c) When the national quality supervision and inspection agency puts forward a requirement for type inspection;
d) During normal production, type inspection shall be carried out at least once every six months.
8.2 Shank inspection in footwear products
When footwear products are spot-checked and submitted for inspection, if the number of specimens cannot meet the requirements of this Standard, the two shanks taken from the same pair of shoes shall be used as the specimen to inspect all items of the shanks. Two pieces are tested for mark, appearance, size, and hardness. After that, one shank is tested for fatigue resistance, and one is tested for other items.
8.3 Result judgment
If in each individual test, if one or more shanks fail to meet the requirements of this Standard, the item will be judged as nonconforming. If one or more of the inspected items are nonconforming, the batch of products shall be deemed nonconforming. Among them, marks, lower limit of length, longitudinal stiffness, hardness, and bending performance are mandatory terms. If 1 item or more is nonconforming, re-inspection is not allowed, and the batch of products is judged as nonconforming. Appearance and fatigue resistance are recommended terms. If 1 item or more is nonconforming, it can be sampled again from the original batch of products. Double the number of samples. Re-inspect the
nonconforming items. Judgment is based on the results of the re-inspection. 9 Marks, packaging, transportation, storage
9.1 Marks

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