Some standard content:
Light Industry Standard of the People's Republic of China
Lead brass rods and wires for clocks
1 Subject content and scope of application
QB/T 1542-1992
This standard specifies the product classification, technical requirements, test methods, inspection rules, and packaging, marking, transportation, and storage of lead brass rods and wires with a diameter range of 1.0~4.0mm. This standard is applicable to lead brass rods and wires with round, hexagonal and embossed cross sections for various clocks and daily machinery. 2 Reference standards
GB/T228 Metal tensile test method
GB/T 321
Preferred number and priority coefficient system
GB/T1958 Shape and position tolerance detection regulations GB/T5122 Brass chemical analysis method
GB/T8888 Packaging, marking, transportation and storage of heavy non-ferrous metal processing products Rules and methods for measuring surface roughness with stylus instruments GB/T 10610
YB732 Copper, nickel and their alloy tubes and bars fracture test method 3 Terminology
3.1 Roundness
The difference between the maximum diameter and the minimum diameter measured on a cross section. 3.2 Rods and wires
Solid processed products with uniform cross section along the entire length, supplied in straight form are bars, and supplied in coils are wires.
4 Product classification
4.1 Alloy grade HPb59-1
4.2 Basic dimensions are as specified in Table 1. The tooth shape of the flower rod is shown in the figure, and the tooth shape parameters are shown in Table 2. Table 1
(Flower)
(Flower)
5.0 (Hexagonal)5.5 (Hexagonal)
14.06.0 (Flower)
Note: ① The specifications and dimensions in this table are selected from the GB/T321R*40 series, and some intermediate specifications and dimensions are inserted. ② Special specifications can be negotiated between the supply and demand parties. ③ (Flower) refers to the flower rod, (Hexagonal) refers to the hexagonal rod. ④ The diameter of the hexagonal handle refers to the diameter of the inscribed circle, that is, the distance between two parallel sides. Approved by the Ministry of Light Industry of the People's Republic of China on July 6, 1992 252
Bar fixed length 1800, 2000
2200.2400
Unfixed length 1600～2500
Wire ≥4000
Implemented on March 1, 1993
Diameter D
QB/T1542—1992
Drawing rod tooth profile diagram
Pitch t
Basic dimensions
4.3 The wire is made by drawing method and the supply state is hard (Y). 4.4 Marking example
The tooth height is
a. Hard, B-grade, 1.0mm diameter bar made of HPb59-1. Marked as: Rod HPb59-1YB1.0QB/T1542, b. Hard, B-grade, 3.5mm diameter wire made of HPb59-1. Marked as: Wire HPb59-1YB3.5QB/T1542. 5 Technical requirements
5.1 The chemical composition of rods and wires shall comply with the requirements of Table 3. Table 3www.bzxz.net
Main components
HPb59-1
Limit deviation
Impurity components (not more than)
Tooth tip fillet「
5.2 The quality grades of rod and wire sizes are divided into three grades: A, B and C according to the limit deviation of diameter. The size range and limit deviation are shown in Table 4. 253
Material shape
Hexagonal rod
Flower rod
Size range
>3. 0~6. 0
>6. 0~10. 0
5. 0~~10. 0
QB/T1542—1992
Limit Deviation
Roundness tolerance of rods and wires shall not exceed half of the diameter limit deviation. 5.3
5.4 Rods shall be straight, without twisting and dead bends, and the straightness shall not exceed 2mm per meter. 5.5 The mechanical properties of rods and wires shall comply with the provisions of Table 5. Table 5
Material Shape
Circular, Hexagonal
Flower Rods
Tensile Strength
440-590
≥390
Note: For rods and wires with a diameter less than 8.0mm, the elongation is L=100 mm gauge length. 5.6 The finished rods and wires shall be annealed to reduce the residual stress in the products. c
Length requirements
Fixed length±10
Unfixed length The permissible delivery weight of each batch shall not exceed 10%, and the length shall not be less than 1200mm
Elongation
15~~30
5.7 The fracture of rods and wires shall be dense, without cracks, pores and inclusions. 5.8 The surface of the rod and wire should be smooth and clean, without cracks, peeling, folding, pulling marks, pores, inclusions and green rust. Slight, local (not more than 10%) scratches, abrasions, concave surfaces, embossing, pitting and slight straightening marks and fine threads that do not exceed the limit deviation of the rod and wire diameter are allowed. Slight red or dark oxidation color and local water marks are also allowed. The surface roughness R value of the rod and wire is not more than 3 .2μm. 6 Test methods
6.1 The standard push analysis method for the chemical composition of rods and wires shall be carried out in accordance with GB/T5122. 6.2 The tensile test of rods and wires shall be carried out in accordance with GB/T228. 6.3 The internal stress test method of rods and wires: Degrease the 150mm long rod and wire sample in advance, then immerse it in mercurous nitrate solution, keep it for 5 to 10 minutes, take it out and rinse it with water, and then observe it with a 5 to 10 times magnifying glass. There should be no cracks. Mercurous nitrate solution formula: mercurous nitrate 114g, nitric acid (specific gravity 1.42) 13mL, distilled water 1000mL. 6.4 The fracture inspection of rods shall be carried out in accordance with YB/T732. 6.5 The length is measured with a tape measure, and the diameter and roundness are measured with an outside micrometer with a graduation value of 0.01mm. 6.6 Straightness inspection There should be no obvious jump when rolling on the platform. If necessary, it shall be carried out according to the straightness error detection plan 1-1 in Appendix 1 of GB/T1958.
6.7 The appearance quality and surface roughness shall be visually inspected with normal vision. If necessary, the surface roughness shall be tested with a profilometer in accordance with the provisions of GB/T10610. The R. value can also be measured with a light-section microscope and then converted to the R value. 254
7 Inspection rules
QB/T1542—1992
7.1 The rods and wires shall be inspected by the supplier's quality inspection department, and the product quality shall be guaranteed to meet the requirements of this standard. The buyer's acceptance period shall be within 30 days after arrival.
7.2 Rods and wires shall be batched with the same brand, specification and state, and each batch shall not exceed 700kg. 7.3 Chemical composition inspection: During the smelting process, the supplier shall take one sample from each furnace for inspection, and the buyer shall take one sample from each batch of products for inspection.
7.4 Tensile test, internal stress and fracture test shall be prepared by taking two samples from each batch. The supplier may not conduct internal stress and fracture inspection, but must ensure compliance with the provisions of this standard.
7.5 Rods and wires shall be measured for external dimensions and inspected for surface quality one by one (roll). 7.6 Repeated test: Even if one test result of each test sample fails, double the test sample from the batch shall be used for re-inspection of the unqualified items. If one test result still fails, the whole batch shall be scrapped or inspected one by one (roll). The qualified ones shall be accepted in a separate batch. 8 Packaging, marking, transportation and storage
8.1 Packaging
8.1.1 Rods and wires shall be wrapped tightly and tied firmly with moisture-proof paper and linen. 8.1.2 Special iron box packaging: Rods shall be bundled into bundles of 10 to 20 kg each and loaded into special boxes. A wooden pallet shall be placed at the bottom of the box and lined with moisture-proof paper. The rods shall be arranged neatly in the box, and a layer of moisture-proof paper shall be added to each layer. The rods shall not be moved in the box. 8.1.3 Wooden box packaging: The rods are bundled into bundles of 10-20kg each and packed into wooden boxes lined with moisture-proof paper. The moisture-proof paper should be wrapped tightly and the rods should not move in the box.
8.2 Marking, transportation and storage shall be carried out in accordance with the provisions of Chapters 2, 3 and 4 of GB/T8888. Additional remarks:
This standard is proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Clock and Watch Standardization Center. This standard was drafted by Nanjing Clock and Watch Material Factory. The main drafters of this standard are Zheng Hongwu, Huang Fuyuan, Cao Xinghua and Rui Youjing. From the date of implementation of this standard, the former Ministry of Light Industry standard QB879-1983 Lead Brass Rods and Wires for Clocks will be abolished. 255
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