This standard specifies the classification, technical requirements and process requirements of round tenons. This standard applies to wooden round tenons used for jointing or positioning. QB/T 3654-1999 Round tenon joint QB/T3654-1999 Standard download decompression password: www.bzxz.net

Light Industry Industry Standard of the People's Republic of China
Circle Joining
Subject Content and Scope of Application
This standard specifies the classification, technical requirements and process requirements of circle sample joining. This standard applies to wooden circle samples for joining or positioning. 2 Reference Standards
QB/T3658 Tolerances and Fits for Wooden Furniture
3 Classification and Main Dimensions
3.1 Type Classification
Circles are divided into four types according to their surface structure, and their names and codes are shown in Figure 1. Type A
Light Round Bead
3.2 Main Dimensions
The main dimensions are shown in Figure 2 and Table 1.
Straight round bar
Approved by the Ministry of Light Industry of the People's Republic of China on December 15, 1988 220
Screw groove round bar
QB/T3654—1999
Net groove round ladder
Implementation on July 1, 1989
3.3 Marking example
QB/T 3654-1999
30~~56
The straight groove round sample with a diameter of 8mm and a length of 40mm is expressed as: Round
B8×40QB/T3654--1999
4 Technical requirements
4.1 Materials
4.1.1 Tree species
Round wreaths should be made of hard tree species, such as ash, birch, wood, and bright wood. 4.1.2 Material
Round wood should have straight texture, without defects such as insect bites, decay, knots, resin sacs, diagonal lines, cracks, etc. 4.2 Moisture content
Round wood should be dried, and its moisture content should be less than 7%. 4.3 Dimension tolerance
The dimensional tolerance of the diameter of the round sample should comply with the tolerance zone js1W of the center axis of QB/T3658--1999; the fit with the hole is shown in Appendix A, and the dimensional tolerance zone of its length should be js2w.
4.4 Process requirements
4.4.1 The surface of the round should be smooth, and the grooved round lollipop pattern should be clear. 4.4.2 The coconut end and the bottom of the hole should maintain a gap of 0.51mm. 4.4.3 When the round sample is used for joining, the hole wall must be glued, and the adhesive can be adenaldehyde resin glue or polyvinyl acetate glue, etc. 4.4.4 In the joint of multiple circles, the spacing between the circle samples shall preferably be 32mm, 64mm, and 96mm. 4.4.5 The diameter of the circle sample shall be two-fifths to one-half of the thickness of the matching plate 5 Packaging
After the circle is made, it shall be immediately packaged in a container to prevent moisture. 221
For the matching of the circle sample and the hole diameter, see Table A1.
Additional instructions:
QB/T3654—1999
Appendix A
Match of circle and hole
(reference)
jslw(circle)bZxz.net
This standard is under the jurisdiction of the National Furniture Standardization Quality Inspection Center. This standard was drafted by the Shanghai Furniture Research Institute. 222
JSiW(hole)
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