GB/Z 41313-2022Blanks for diamond circular saw blade (English PDF)

Foreword

This document was drafted in accordance with the rules given in GB/T 1.1-2020, Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.

This document was proposed by the China Building Materials Federation and is under the jurisdiction of the National Technical Committee on Stone of Standardization Administration of China (SAC/TC 460).

The drafting organizations of this document are Sinoma Synthetic Crystals Research Institute Co., Ltd., Hebei Xingshuo Saw Industry Co., Ltd. and Beijing Sinoma Synthetic Crystals Research Institute Co., Ltd.

The main drafters of this document are An Fengzhan, Zheng Chunqi, Zhou Junxing, Chen Zhixing and Zhao Shenglin.

1 Scope

This document specifies the classification, dimension symbols and marking, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of blanks for diamond circular saw blades.

This document applies to blanks for diamond circular saw blades used for cutting non-metallic materials.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 230 (all parts), Metallic materials - Rockwell hardness test; GB/T 699, Quality carbon structural steels; GB/T 1184, Geometrical tolerancing - Geometrical tolerance for features without individual tolerance indications; GB/T 3077, Alloy structure steels; GB/T 6060.2, Surface roughness comparison specimens - Ground, turned, bored, milled, shaped and planed; GB/T 24181, Steel for welded diamond saw blade blanks; GB/T 39811, Stone industry equipment - Terminology, classification and model designation method.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in GB/T 39811 apply.

4 Classification, dimension symbols and marking

4.1 Classification. 4.1.1 By welding process: a) high-frequency welded diamond circular saw blade blank (code G); b) laser welded diamond circular saw blade blank (code J). 4.1.2 By thickness: a) standard type diamond circular saw blade blank (code P); b) thin type diamond circular saw blade blank (code T). 4.1.3 By shape of the water slot: a) U-shaped water slot blank (code U); b) keyhole water slot blank (code Y); c) blank without water slot (code W).

4.2 Dimension symbols. 4.2.1 The shape and structure of the slotted diamond circular saw blade blank are shown in Figure 1 (front view of the disc with slots, slot holes, central bore and drive holes on a pitch circle, and side view showing the bore and the thickness). 4.2.2 The dimension symbols are given in Table 1: A - slot depth; B - slot width; C - slot hole diameter; D - blank outer diameter; E - blank thickness; L - blank tooth (segment) length; Z - number of teeth; H - bore diameter.

4.3 Marking. 4.3.1 The marking order is: blank code, outer diameter, bore diameter, thickness, number of teeth, standard number. 4.3.2 The blank code consists of the codes for welding process, thickness and water slot shape. 4.3.3 The marking method is: XXX D x H x E-Z GB/T 41313-2022, where XXX is the blank code, D the outer diameter, H the bore diameter, E the blank thickness and Z the number of teeth. Example: a laser welded, standard type, U-shaped water slot diamond circular saw blade blank with outer diameter 1 584 mm, bore diameter 100 mm, thickness 3.0 mm and 104 teeth is marked JPU 1584 x 100 x 3.0-104 GB/T 41313-2022.

5 Raw materials

5.1 High-frequency welded diamond circular saw blade blanks and thin type diamond circular saw blade blanks should be made of 65Mn or of other grades of material whose service performance is not lower than that of 65Mn.

5.2 Laser welded diamond circular saw blade blanks should be made of 28CrMo, 30CrMo or other grades of material with similar performance.

5.3 All performance indicators of the blank material shall comply with the technical requirements of the relevant standards such as GB/T 24181, GB/T 699 and GB/T 3077.

6 Technical requirements

6.1 Dimensional deviations. 6.1.1 The dimensional deviations of standard type blanks shall comply with Table 2; special requirements are agreed between supplier and purchaser. In Table 2 the tolerances on tooth length L, slot depth A, slot width B and slot hole diameter C are +/-0.5 mm.

Table 2 (standard type), outer diameter D and tolerance: 95, 100, 115, 140 and 190 mm: +/-0.3 mm; 240 to 540 mm: +/-0.5 mm; 590 to 990 mm: +/-0.8 mm; 1 084 to 1 784 mm: +/-1.0 mm; 1 984 to 2 584 mm: +/-2.0 mm; 2 784 to 3 182 mm: +/-2.5 mm; 3 582 mm: +/-3.0 mm; 3 782 and 3 982 mm: +/-3.5 mm; 4 182 and 4 482 mm: +/-4.0 mm; 4 782 and 4 982 mm: +/-4.5 mm; 5 182 mm: +/-5.0 mm. Thickness E: 0.8 mm to 4.0 mm with +/-0.05 mm for D 95 to 390 mm; 1.8 mm to 4.5 mm with +/-0.10 mm for D 440 to 790 mm; 3.0 mm to 6.0 mm for D 890 to 1 284 mm; 3.0 mm to 8.0 mm for D 1 384 to 1 784 mm; 4.0 mm to 10.0 mm for D 1 984 to 3 182 mm; 7.0 mm to 12.0 mm for D 3 582 to 5 182 mm; thickness tolerance +/-0.10 mm for D 890 to 1 084 mm, +/-0.15 mm for D 1 184 to 2 184 mm, +/-0.20 mm for D 2 484 to 3 582 mm and JS15 for D 3 782 to 5 182 mm.

Table 2, tooth length L: D 95 mm: 34.3 mm; 100 mm: 36.3 or 31.9 mm; 115 mm: 36.1 or 32.1 mm; 140 mm: 36.6 mm; 190 mm: 33.8 mm; 240 mm: 33.9 mm; 290 to 790 mm: >= 40 mm; 890 to 3 182 mm: >= 24 mm; 3 582 to 5 182 mm: >= 30 mm. Bore diameter H and tolerance: D 95 to 140 mm: set by the user, +0.022/0 mm; 190 and 240 mm: 16 mm, +0.027/0; 290 mm: 22 mm, +0.033/0; 340 and 390 mm: 50 or 60 mm, +0.039/0; 440 to 790 mm: 50 or 80 mm, +0.046/0; 890 to 1 184 mm: 80 or 100 mm, +0.054/0; 1 284 to 2 584 mm: 100 or 150 mm, +0.063/0; 2 784 to 5 182 mm: 150 or 200 mm, +0.072/0.

Table 2, slot depth A / slot width B / slot hole diameter C: D 95 and 100 mm: A 6.5 or 10, B 2 or 3, C 6; D 115 and 140 mm: A 8.5 or 10, B 2 or 4, C 6; D 190 mm: A 10, 12 or 14, B 2 or 6, C 6; D 240 mm: A 10, 12 or 14, B 3 or 8, C 6; D 290 to 790 mm: A 14 or 16, B 3, 10 or 12, C 8 or 10; D 890 and 990 mm: A 18 or 20, B 18; D 1 084 to 1 784 mm: A 20 or 22, B 20; D 1 984 and 2 184 mm: A 22 or 24, B 22; D 2 484 and 2 584 mm: A 25, B 25; D 2 784 and 2 982 mm: A 30, B 25; D 3 182 to 5 182 mm: A 30, B 30; no slot hole C for D 890 mm and above (all values in mm).

Table 2, number of teeth Z by outer diameter: 95: 8; 100: 8 or 9; 115: 9 or 10; 140: 12; 190: 15; 240: 18; 290: 18; 340: 21; 390: 24; 440: 26; 490: 30; 540: 32; 590: 36; 690: 40 or 42; 790: 46; 890: 64; 990: 70; 1 084: 74; 1 184: 80; 1 284: 88; 1 384: 92; 1 484: 100; 1 584: 104 or 108; 1 784: 118 or 120; 1 984: 126 or 128; 2 184: 132 or 136; 2 484: 140; 2 584: 146; 2 784: 156; 2 982: 160; 3 182: 170; 3 582: 184; 3 782: 190; 3 982: 200; 4 182: 210; 4 482: 226; 4 782: 230; 4 982: 240; 5 182: 248.

6.1.2 The dimensional deviations of thin type blanks shall comply with Table 3; special requirements are agreed between supplier and purchaser. Table 3 (thin type, L, A and B tolerances +/-0.5 mm): D 590, 690, 790 mm (+/-0.8 mm): E 2.0 mm to 4.0 mm +/-0.10 mm, L >= 40 mm, H 50 or 80 mm +0.046/0, A 16, B 10, Z 36, 40 or 42, 46; D 890 and 990 mm (+/-0.8 mm): E 2.0 mm to 4.0 mm +/-0.10 mm, L >= 24 mm, H 80 or 100 mm +0.054/0, A 18 or 20, B 18, Z 64 and 70; D 1 084, 1 184, 1 284, 1 384 mm (+/-1.0 mm): E 3.0 mm to 4.5 mm +/-0.12 mm, L >= 24 mm, H 80 or 100 mm (1 084, 1 184) or 100 mm (1 284, 1 384) +0.054/0, A 20 or 22, B 20, Z 74, 80, 88, 92; D 1 484, 1 584, 1 784 mm (+/-1.0 mm): E 3.0 mm to 5.0 mm +/-0.12 mm, H 100 mm +0.054/0, A 20 or 22, B 20, Z 100, 104 or 108, 118 or 120; D 1 984, 2 184, 2 484 mm (+/-2.0 mm): E 3.0 mm to 6.0 mm +/-0.15 mm, H 100 or 150 mm +0.063/0, A 24 (1 984, 2 184) or 25 (2 484), B 22 or 25, Z 126 or 128, 132 or 136, 140.

6.1.3 The thickness variation within one blank of standard type blanks shall comply with Table 4 (mm): D 95 to 190: 0.03; >190 to 390: 0.04; >390 to 790: 0.05; >790 to 1 184: 0.06; >1 184 to 1 584: 0.08; >1 584 to 1 984: 0.10; >1 984 to 2 982: 0.15; >2 982 to 3 482: 0.20; >3 482 to 4 482: 0.30; >4 482 to 5 182: 0.40.

6.1.4 The thickness variation within one blank of thin type blanks shall comply with Table 5 (mm): D >590 to 984: 0.04; >984 to 1 184: 0.05; >1 184 to 1 584: 0.06; >1 584 to 1 984: 0.08; >1 984 to 2 484: 0.10.

6.2 Surface quality. 6.2.1 The surface of the blank shall be free from cracks, burrs, traces of corrosion and the like. 6.2.2 The blank may have drive holes that do not affect its service performance. 6.2.3 The surface roughness of the blank faces and of the mounting hole shall be not worse than Ra 3.2, and that of the tooth water slots not worse than Ra 6.3.

6.3 Blank hardness. More than 80% of the hardness points of the blank shall comply with Table 6, and the hardness variation within one blank shall comply with Table 7. Table 6: high-frequency welded blank 38 HRC to 45 HRC; high-frequency welded ultra-thin blank 41 HRC to 45 HRC; laser welded blank 33 HRC to 39 HRC. Table 7, hardness variation within one blank (HRC) by outer diameter (mm): 95 to 390: 1.0; >390 to 690: 1.5; >690 to 1 384: 2.0; >1 384 to 2 184: 2.5; >2 184 to 2 982: 3.0; >2 982 to 3 582: 3.5; >3 582 to 4 582: 4.5; >4 582 to 5 182: 5.0.

6.4 Geometrical tolerances. 6.4.1 The radial circular run-out tolerance shall comply with Table 8 (mm): D 95 to 250: 0.04; >250 to 500: 0.05; >500 to 800: 0.06; >800 to 1 200: 0.08; >1 200 to 2 000: 0.10; >2 000 to 3 000: 0.12; >3 000 to 3 500: 0.15; >3 500 to 4 500: 0.20; >4 500 to 5 200: 0.25. 6.4.2 The flatness tolerance of the faces of standard type blanks shall comply with Table 9 (mm): D 95 to 250: 0.08; >250 to 400: 0.10; >400 to 630: 0.12; >630 to 1 000: 0.20; >1 000 to 1 600: 0.25; >1 600 to 1 800: 0.30; >1 800 to 2 500: 0.40; >2 500 to 3 000: 0.50; >3 000 to 3 500: 0.60; >3 500 to 4 000: 0.70; >4 000 to 4 500: 0.90; >4 500 to 5 200: 1.10. 6.4.3 The flatness tolerance of thin type blanks shall comply with Table 10 (mm): D >600 to 1 000: 0.20; >1 000 to 1 600: 0.25; >1 600 to 2 000: 0.30; >2 000 to 2 500: 0.40.

6.4.4 The axial (face) circular run-out tolerance of standard type blanks shall comply with Table 11 (outer diameter range: run-out tolerance / flange diameter, mm): 95 to 250: 0.10 / 80; >250 to 450: 0.12 / 120; >450 to 600: 0.20 / 120; >600 to 820: 0.25 / 170; >820 to 1 000: 0.30 / 250; >1 000 to 1 200: 0.35 / 250; >1 200 to 1 400: 0.45 / 250; >1 400 to 1 600: 0.50 / 250; >1 600 to 1 800: 0.60 / 300; >1 800 to 2 000: 0.70 / 400; >2 000 to 2 250: 0.80 / 400; >2 250 to 2 500: 0.90 / 400; >2 500 to 3 000: 1.20 / 400; >3 000 to 4 000: 1.50 / 500; >4 000 to 4 500: 1.80 / 600; >4 500 to 5 200: 2.20 / 800.

6.4.5 The axial circular run-out tolerance of thin type blanks shall comply with Table 12 (outer diameter range: run-out tolerance / flange diameter, mm): >600 to 800: 0.25 / 170; >800 to 1 000: 0.35 / 250; >1 000 to 1 200: 0.40 / 250; >1 200 to 1 400: 0.50 / 250; >1 400 to 1 600: 0.55 / 250; >1 600 to 1 800: 0.65 / 300; >1 800 to 2 200: 0.75 / 400; >2 200 to 2 500: 0.85 / 400. 6.4.6 For drive holes made at the user's request, the positional deviation relative to the axis of the blank bore is diameter 1.0 mm, and the drive hole diameter shall meet the user's requirements.

7 Test methods

7.1 Raw materials. The performance tests of the blank material are carried out in accordance with GB/T 24181, GB/T 699 and GB/T 3077.

7.2 Dimensional deviations. 7.2.1 Using a measuring instrument meeting the required accuracy, measure the outer diameter of the blank along two mutually perpendicular diameters, to 0.1 mm; the maximum and minimum differences between measured and nominal values are the dimensional deviation. 7.2.2 Measure the blank thickness at the rim on four diameters at 45 degrees to each other, to 0.01 mm; the maximum and minimum differences from the nominal value are the thickness deviation, and the difference between the maximum and minimum measured values is the thickness variation within the blank. 7.2.3 On the teeth located on four diameters at 45 degrees to each other, measure the chord length on the tooth centre line, to 0.1 mm; the maximum and minimum differences from the nominal value are the tooth length deviation.

7.2.4 Measure the bore along two mutually perpendicular diameters, to 0.01 mm; the maximum and minimum differences from the nominal value are the bore diameter deviation. 7.2.5 On the slots located on four diameters at 45 degrees to each other, measure the maximum depth of the slot opening and the chord length on the centre line, to 0.1 mm; the maximum and minimum differences from the nominal values are the slot depth and slot width deviations. 7.2.6 On the slot holes located on four diameters at 45 degrees to each other, measure two mutually perpendicular hole diameters, to 0.1 mm; the maximum and minimum differences from the nominal value are the slot hole diameter deviation.

7.3 Surface quality. 7.3.1 Surface quality is inspected visually; defects such as cracks are inspected with a 10x magnifier. 7.3.2 Surface roughness is inspected by comparison in accordance with GB/T 6060.2.

7.4 Blank hardness. Hardness is tested with a Rockwell hardness tester at not fewer than 10 points evenly distributed on a circle 40 mm from the outer circumference, in accordance with GB/T 230 (all parts). The difference between the maximum and minimum hardness values within the specified range on one blank is the hardness variation within the blank.

7.5 Geometrical tolerances. 7.5.1 Radial circular run-out is measured with a dial indicator or a device of corresponding accuracy, using the bore as datum. The blank is fixed on a mandrel, the indicator stylus is placed perpendicular to the side of the blank on a circle 50 mm from the outer circumference (5 mm below the bottom of the water slot where slots exist), the blank is rotated slowly and the maximum and minimum readings are taken to 0.01 mm; their difference is the radial circular run-out tolerance.

7.5.2 Flatness is checked with a knife-edge straightedge of 0.02 mm accuracy and feeler gauges; the straightedge length shall be not less than 1/2 of the blade diameter. The check is made on both sides in an asterisk (star) pattern and in a square pattern around the blade centre; the highest value is the flatness. When the straightedge is too short, successive overlapping checks are made along the measuring line, with an overlap of not less than 1/3 of the straightedge length. 7.5.3 For axial run-out the blank is fixed on a mandrel; the face run-out of the flange shall not exceed 1/10 of the run-out tolerance of the blank being tested, and the flange diameter shall not exceed 1/3 of the blank diameter. The indicator stylus is placed perpendicular at the centre of the teeth on the rim (on the rim centre line when there are no slots), the blank is rotated slowly and the maximum and minimum readings are taken to 0.01 mm; their difference is the axial run-out.

7.5.4 Drive hole position: with general measuring instruments meeting the accuracy requirements, measure the hole diameter, the shortest distance between the drive hole and the bore and the shortest distance between drive holes, to 0.1 mm; the differences between these measured distances and the theoretically calculated values are the positional deviation of the drive holes.

8 Inspection rules

8.1 Factory inspection. 8.1.1 Inspection items: a) mounting hole diameter; b) outer diameter; c) blank thickness; d) tooth length, slot width, slot depth; e) surface quality; f) drive hole position; g) radial circular run-out; h) axial run-out; i) flatness of the faces; j) hardness of the faces. 8.1.2 Batch: blanks of the same specification, the same model and the same heat treatment batch form one batch. 8.1.3 Sampling: every product is inspected (100% inspection). 8.1.4 Judgement: a single blank is acceptable when all inspection items meet the requirements; a batch is acceptable when all products in it are acceptable, otherwise the batch is non-conforming.

8.2 Type inspection. 8.2.1 Inspection items: all items of Clause 5 (as printed). 8.2.2 Type inspection is carried out in any of the following cases: a) trial production and type approval of a new product; b) significant changes in structure or process after regular production; c) resumption of production after a stoppage of more than one year; d) a significant difference between the factory inspection results and the last type inspection.

8.2.3 Batch: products of the same model, the same specification and the same order batch form one batch. 8.2.4 Sampling: 5% to 10% of the batch is sampled at random from products that have passed factory inspection, with a minimum of 2 pieces. 8.2.5 Judgement: the batch is acceptable when all results meet the requirements. If one indicator fails, double the number of samples is taken from the batch for re-inspection; the batch is acceptable if all re-inspection results comply, otherwise it is non-conforming. If two or more indicators fail, the batch is non-conforming.

9 Marking, packaging, transportation and storage

9.1 Marking. 9.1.1 The following shall be marked on the blank at one third of the radius from the centre: a) manufacturer, trademark or factory name; b) product marking, product number or batch number; c) conformity mark. 9.1.2 If necessary, an arrow may indicate the direction of rotation, positioned opposite the factory mark at half the radius from the centre. 9.1.3 Markings shall be clear and durable.

9.2 Packaging. 9.2.1 Before packaging the blanks shall receive rust-preventive treatment and be placed flat and stable in the case; the packaging shall provide protection against moisture, means for lifting and protection against impact, and shall comply with the relevant safe transport regulations. 9.2.2 The outside of the packing case shall show: a) name and address of the manufacturer; b) product name, product marking, specification and quantity, and number of the standard applied; c) date of manufacture; d) marks such as 'Handle with care', 'Shockproof', 'Keep dry' and 'This way up'.

9.3 Transportation. Collisions and rolling or dropping shall be avoided during transportation.

9.4 Storage. 9.4.1 When stored outdoors the blanks shall be covered. 9.4.2 Blanks shall be stacked separately by model, specification and the like.