This standard applies to drawn pattern waveguides used in the manufacture of radio equipment and telecommunication equipment in the electronics and telecommunication industries. GB/T 8894-1988 Circular copper alloy waveguide GB/T8894-1988 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Circular copper alloy waveguide
Copper and copper alloys
Circular waveguid tube
UDC669.35-462
GB 8894
This standard applies to the drawn graphic waveguide used in the manufacture of radio equipment and telecommunication equipment in the electronics and telecommunication industries. Terminology
Basic size
Eccentricity
-The inner hole size and outer edge size that determine the cross-sectional shape of the tube. Half of the difference between the outer edge size and the inner hole size is the nominal wall thickness. Half of the difference between the maximum wall thickness and the minimum wall thickness of the same cross-section of the tube--the maximum deviation between the straight line connecting two points on the actual axis of the tube at a specified length and the actual axis. Curvature-
The degree is measured on the outer surface of the tube.
1.5 Out of roundness
2 Varieties
2.1 Brand, state
The difference between the maximum diameter and the minimum diameter at the same cross section of the pipe. The brand and state of the product shall comply with the provisions of Table 1. Table 1
2.2 Appearance, size and allowable deviation
2.2.1 The circular waveguide is shown in the figure below.
D-Inner diameter of pipe: D
Approved by China Nonferrous Metals Industry Corporation on February 12, 1988Outer diameter of pipe: S·Wall thickness
Supply state
Hard (Y)
1989.0201 Implementation
GB 8894
2.2.2 The size and allowable deviation of the pipe shall comply with the provisions of Tables 2 and 3. Table 2
Internal nipple size
Model name
Allowable deviation
Internal hole size
Allowable deviation
±-0. 044
Note: The specifications listed in this table are selected specifications. GB 8894-88
Note: (After negotiation between the supply and demand parties, pipes with other specifications and allowable deviations can be supplied. D
The accuracy of the minimum allowable deviation must be indicated in the contract, otherwise it will be supplied according to the II grade accuracy. 2.2.3 The length of pipe supply is divided into three types: fixed length, multiple length and irregular length. 2.2.3.1 The irregular length is 1~4m.
Outer edge size
Allowable deviation
±0, 12
2.2. 3.2 The length of fixed length or multiple length should be within the range of variable length. The allowable deviation of fixed length or multiple length is +15mm; multiple length should leave a sawing margin, each sawing amount is 5mm. Note: The length of fixed length or multiple length should be specified in the contract. 2.2.4 The end of the pipe should be sawed flat, but slight burrs are allowed. The cut should not be more than 3mm without causing the pipe length to exceed its allowable deviation.
2.2.5 The curvature of the pipe: The curvature of the pipe of grade 1 precision is The curvature is not more than 1mm per meter; the curvature of grade I, II and III precision pipes is not more than 3mm per meter; the curvature of grade II and III precision pipes is not more than 4mm per meter. 2.2.6 Pipe out-of-roundness: The out-of-roundness of grade I precision pipes is not more than half of the allowable deviation of the pipe diameter; the out-of-roundness of grade II and III precision pipes is not more than the allowable deviation of the pipe diameter.
2.2.7 The eccentricity of the pipe should not be more than 10% of the nominal wall thickness. 2.3 Marking example
Use H9 6 The inner diameter of the manufactured waveguide tube is Φ32.54mm and the outer diameter is Φ36.60mm, and the mark is: waveguide H96Y32.51XΦ36.60GB8894-883 Technical requirements
3.1 Chemical compositionwww.bzxz.net
The chemical composition of the pipe should comply with the provisions of H96 and H62 in GB5232-85 "Chemical composition and product shape of processed brass". 33
3.2 Annealing treatment
GB 8894-88
Waveguide tubes made of H62 should be annealed to eliminate internal stress. 3.3 Surface quality
3.3.1 The inner surface of the tube should be smooth and clean, and should not have defects such as cracks, burrs, peeling, pores, pits, scratches and jumping marks. Longitudinal pull marks, surface pitting caused by drawing, slight oxidation color, redness, etc. shall not be used as a basis for scrapping. 3.3.2 If the basic size of the inner diameter of the tube is greater than 100mm, the roughness (Ra) of the inner surface shall not be greater than 1.6μm; if the inner diameter is less than 100mm, the roughness (Ra) of the inner surface shall not be greater than 1.6μm; if the inner diameter is less than 100mm, the roughness (Ra) of the inner surface shall not be greater than 1.6μm; if the inner diameter is less than 100mm, the roughness (Ra) of the inner surface shall not be greater than 1.6μm. 00mm pipe inner surface roughness (Ra) should not be greater than 0.8μm. After negotiation between the supply and demand parties, pipes with inner surface roughness (Ra) of 0.4um can be supplied.
Jiang: The supplier may not conduct inner surface roughness inspection, but must guarantee it. 3.3.3 The outer surface of the pipe should not have cracks or peeling, and defects such as folding, bubbles, scratches, pits, bruises and pressed objects that cause outer diameter deviation after inspection and repair are not allowed. Longitudinal pull marks, surface pitting caused by drawing, oxidation color and reddening are not used as scrapping basis. 4 Test method
4.1 Chemical composition arbitration analysis method
The chemical composition arbitration analysis method of the pipe shall be carried out in accordance with the provisions of GB5122-85 "Chemical Analysis Method for Brass". 4.2 Dimension measurement method
4.2.1 Use a micrometer, steel tape measure or other measuring tools that can ensure measurement accuracy to measure the size of the pipe. 4.2.2 Method for measuring curvature: Place the pipe parallel to the platform, use a 1m long steel ruler to lean against the concave surface of the pipe to be measured, and use a feeler gauge or other measuring tools to measure the maximum distance between the pipe and the steel ruler. 4.3 Inspection of surface quality
4.3.1 The outer surface of the pipe should be visually inspected one by one. 4.3.2 The inner surface of the pipe should be inspected one by one against a fluorescent lamp. 4.3.3 The surface roughness can be inspected by visual comparison with a standard block, or the Ra value can be measured with a stylus profiler. 5 Inspection rules
5.1 Inspection and acceptance
5.1.1 The pipe should be inspected and accepted by the supplier's technical supervision department, and the product quality should be guaranteed to meet the requirements of this standard. 5.1.2 The buyer should re-inspect the received products. If the re-inspection results do not meet the requirements of this standard, the buyer should report to the supplier within three months from the receipt of the product, and the supplier and buyer should negotiate to resolve the problem. 5.2 Batches
Pipes should be submitted for inspection in batches, and each batch of pipes should be composed of the same brand, state and specification. 5.3 Inspection items
Each batch of pipes should be inspected for chemical composition, external dimensions and surface quality. 5.4 Sampling location and sampling quantity
5.4.1 Sampling of chemical composition:
5.4.1.1 During the process of melting and casting pipe ingots, the supplier shall take one sample from each furnace for chemical composition inspection. 5.4.1.2 The buyer shall randomly take * samples from each batch of pipes for chemical composition inspection. 5.4.2 The external dimensions and surface quality inspection of the pipes shall be carried out one by one. 5.5 Repeated test
For the chemical composition analysis test, even if one test result fails, double samples shall be taken from the batch for re-inspection of the unqualified item. If one sample still fails in the re-inspection result, the whole batch shall be scrapped. 6 Marking, packaging, transportation and storage
6.1 Marking
GB8894.--88
The marking of pipes shall comply with the relevant marking provisions in GB8888-88 "Packaging, marking, transportation and storage of heavy non-ferrous metal processing products".
6.2 Packaging
Pipes shall be wrapped with packaging paper (wax paper or anti-rust paper and other packaging materials) along the entire length of the pipes according to the size of the specifications. The two ends of the pipes shall be sealed with soft paper and placed in iron (wood) packaging boxes of equivalent size with anti-rust paper or wax paper in a straight and orderly manner according to the length of the pipes. No movement is allowed, and the gaps are filled with paper scraps without words. The net weight of each box shall not exceed 000kg. 6.3 Transportation and storage
During transportation and storage, collision, moisture, wetting and corrosion by active chemicals shall be prevented. Additional Notes:
This standard was drafted by Shenyang Nonferrous Metal Processing Plant. The main drafter of this standard is Zhang Chunxuan.
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