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JY/T 0513-2015 English PDF

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JY/T 0513-2015: (Cube group)
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Basic data

Standard ID JY/T 0513-2015 (JY/T0513-2015)
Description (Translated English) (Cube group)
Sector / Industry Education Industry Standard (Recommended)
Word Count Estimation 6,617
Date of Issue 2016-10-24
Date of Implementation 2017-01-01
Regulation (derived from) Education - (2016) No.5
Issuing agency(ies) Ministry of Education of the People's Republic of China

JY/T 0513-2015: (Cube group)

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Cube group) ICS 03.180 Y 51 Record number xxxxx-xxxx Education Industry Standard of the People's Republic of China Cube group Cube sets Published on October 10,.2016 2017–01–01 Implementation Published by the Ministry of Education of the People's Republic of China JY

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the First Division of Basic Education of the Ministry of Education of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Educational Equipment Standardization (SAC/TC 125). The main drafters of this standard. Ningbo Mingsen Science and Education Instrument Co., Ltd., Zhejiang Education Technology Center. The main drafters of this standard. Wang Heyun and Ren Weide. Cube group

1 Scope

This standard specifies the requirements for cube groups, test methods, inspection rules, signs, labels, instruction manuals, packaging, transportation, storage Save. This standard applies to cube groups for teaching experiments.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document. GB/T 6060.2-2006 Surface roughness comparison Sample grinding, turning, boring, milling, inserting and planing surfaces GB/T 14495-2009 Geometric Product Specification (GPS) Surface Structure Contour Method Surface Roughness Comparison Samples of Wooden Parts JY/T 0001-2003 General quality requirements for teaching instruments and equipment products JY/T 0002-2003 Inspection rules for teaching instruments and equipment products JY/T 0213-1994 Teaching mechanics, thermal instrument transportation, storage environmental conditions and test methods

3 Model designation

3.1 Naming rules Product naming is in accordance with the provisions of JY/T 0026-1991. 3.2 Model Nomenclature The model of the cube group is named. L-LFTZ-W-20/25/30/50 Product specifications, side length in millimeters (mm) Product feature code, five pieces Product name Pinyin prefix, cube group Product model classification code, special instrument for mechanics Model example. L-LFTZ-W-20/25/30/50 represents a cube group, five pieces, with four sides of 20 mm, 25 mm, 30 mm, and 50 mm. It is a special instrument for mechanics.

4 Requirements

4.1 Product composition and specifications 4.1.1 The product consists of cubes of four materials. brass, iron, aluminum (or alloy aluminum), and wood, of which two are aluminum. Specifications should meet Table 1. Table 1 is equipped with a dynamometer with a full scale of 1 N. 4.1.2 The allowable error of the side length of each cube in Table 1 is ± 0.2 mm. The allowable error of the density of copper, iron and aluminum is not more than 5% of the nominal value. The cube density is 0.45 g/cm3 ～ 0.70 g/cm3; the verticality error of each cube should meet Table 1. Table 1 Specifications of cube groups 4.2 Hook Each cube should have a stainless steel hook on the plane. The material of the hook is 1.6 mm ± 0.1 mm, and the diameter of the hook and loop is 10 mm ± 1 mm. The hook should conform to the dimensions of Figure 1. When pulling 5 N, the hook should not fall off. Figure 1 Hook shape and size 4.3 Wood moisture content It shall meet the requirements of 6.28 in JY/T 0001-2003. 4.4 inner box The box inside the cube group should be plastic or bakelite products. Each cube in the box should have a fixed card position. 4.5 appearance requirements 4.5.1 The surface roughness of each cube is 3.2 μm. The sampling length rl of the surface roughness aR of the wooden cube is 0.8 mm. 4.5.2 The four sides of the product shall be chamfered. The surface of the brass and aluminum cubes shall be anodized in accordance with Table 1 in 4.1. The surface of the iron cube should be black. Resin varnish on wood surface. 4.6 Other appearance and craftsmanship The product should also comply with the relevant provisions of JY/T 0001 Chapters 4-7. material density g/cm3 Side length mm Verticality error mm Brass 8.5 20 1.75 Iron 7.8 20 1.75 Al 2.7 25 2.19 Al 2.7 30 2.62 Wood 0.45 ～ 0.70 50 4.37 4.7 Environmental test According to JY/T 0213-1994 humidity test and free drop test (packed state).

5 Test method

5.1 Dimensions 5.1.1 Cube geometry is measured with a vernier caliper with a graduation value of 0.02 mm. Measuring the side length of a cube should measure 12 sides, take the arithmetic The average value shall comply with 4.1.2. 5.1.2 Cube verticality error test. Place the cube on a class III platform with the vertical plane against a wide square, and use a feeler gauge to measure the vertical position. The clearance between the upper (or lower) surface of the cube and the square shall comply with Table 1 in 4.1.2. 5.2 Material density The density of the cube group is measured with a class III balance with a maximum weighing of.200 g and a division value of 0.2 g.    (1) In the formula.  --density in grams per cubic centimeter (g/cm3); m-the mass of the cube, in grams (g); 1l-The average measurement of the side length of the cube in millimeters (mm).  It shall meet the requirements of 4.1.2. 5.3 Surface roughness The surface roughness of copper, iron, and aluminum cubes was evaluated using a surface roughness comparison sample (according to GB/T 6060.2-2006). Wooden cubes The surface roughness shall be evaluated with a surface roughness comparison sample (according to GB/T 14495-2009) and shall meet the requirements of 4.5.1. 5.4 Hook Hook diameter and length are measured with a vernier caliper with a graduation value of 0.02 mm. Pull test. Hold the cube on the table with your hand and measure The dynamometer with a distance of 10N is hooked on the hook of the cube, the dynamometer is pulled to 5 N, and the hook should not be pulled out. 5.5 Wood moisture content Testing with a wood hygrometer shall comply with 4.3. 5.6 Other 5.6.1 The sensory inspection for the appearance of each cube shall meet the requirements of 4.5.2. 5.6.2 The remaining sensory tests shall meet the relevant requirements of Chapter 4. 5.7 Environmental test The humidity test method is in accordance with 4.2 of JY/T 0213-1994, and the moisture-proof packaging on the surface of the cube is not removed. Free fall test according to JY/T 0213-1994 of 4.6.

6 Inspection rules

6.1 Inspection classification The inspection of this product is divided into factory inspection, type inspection and quality supervision inspection. 6.2 Inspection items and inspection methods The inspection items and inspection methods of the cube group are shown in Table 2. Table 2 Inspection items and inspection methods of cube group Serial number inspection content standard provisions factory inspection type inspection 1 Product Composition 4.1.1 ● ● 2 Specifications 4.1.2 ○ ● 3 Hook 4.2 ○ ● 4 Wood moisture content 4.3 ○ ● 5 Inner box 4.4 ○ ● 6 Surface roughness 4.5.1 ○ ● 7 Corner chamfer 4.5.2 ○ ● 8 Other appearances and craftsmanship 4.6 ● ● 9 Environmental test 4.7-● Note. "●" in the table means full inspection for batch products, "○" means sample inspection for batch products, and "-" means no inspection. 6.3 Sampling method 6.3.1 During the factory inspection, all the inspection items shall be inspected first, and samples shall be taken from the qualified products of all inspection items, and the items for sampling inspection shall be inspected. 6.3.2 The sampling method for factory inspection and type inspection is according to JY/T 0002. 6.4 Non-conformance determination 6.4.1 The failure criterion of a single sample shall be in accordance with 4.3 of JY/T 0002-2003. 6.4.2 The main technical indicators are No. 1, 2, and 3 in Table 1. 6.5 Review rules 6.5.1 Unqualified batches and products can be submitted for inspection again after rework. 6.5.2 If the cause of the batch disqualification is a sampling inspection item, the item is changed to a full inspection during the re-inspection. 7 signs, labels, instruction manuals, packaging, transportation, storage 7.1 The inner packaging of cube groups shall be one box per set. 7.2 Others shall comply with the provisions of Chapters 11 and 12 of JY/T 0001-2003.

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