JB/T 9168.5-1998 JB/T 9168.5-1998 General process code for cutting drilling JB/T9168.5-1998 Standard download decompression password: www.bzxz.net

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Machinery Industry Standard of the People's Republic of China
JB/T9168.1~9168.13-1998
Common process instructions for cutting1998-11·16 Issued
National Machinery Industry Standard
199812-01 Implementation
1 Scope
Machinery Industry Standard of the People's Republic of China
Common process instructions for cuttingDrilling
Cobinon prucess instructions far cuttingProcexs instrucifons for drlllingThis standard specifies the basic rules that should be followed in drilling and is applicable to drilling and other processing of various enterprises. 1. Drilling and other processing should also comply with the provisions of J/T9168.1. 2 Reference Standards
JB/T:9168.5-1998
Date/23.5-8
The clauses contained in the following standards constitute the clauses of this standard through their use in this standard. When this standard is issued, the versions shown are valid. All standards are subject to revision. Parties using this standard should consider the possibility of using the latest versions of the following standards. JB/TU168.1-1008 Design and General Technical Guidelines 3 Drilling
3. When drilling holes according to the markings, first try drilling, and then start drilling after the center is determined. 3.2 When drilling on an inclined or uneven surface, first make a small surface and then drill. 3.3 When the hole is not through, the positioning block should be adjusted according to the drilling depth. 3.4 When drilling deep holes, in order to prevent internal cutting and blocking and twisting of the drill bit, a smaller feed should be used, and the drill bit should be drilled twice; when drilling deep holes with a long drill bit, the standard drill bit should be used to drill to a certain depth before using the extended drill bit. 3.5 After the thread base is drilled, the side angle must be adjusted.
4. When using a drill bit, a short drill bit should be selected, and the center angle and rake angle should be appropriately reduced. 4.2 The cutting speed when drilling should generally be one-third to one-half of the cutting speed of the hole. 5 Reaming
5. When drilling a hole, the required amount of feed should be adjusted. 5.2 When drilling a hole on a drilling machine, the cutting depth and reverse feed should be appropriately adjusted. 5.3 When drilling a hole, the reamer should not be reversed.
5.4 After the forging hole is completed, it must be First, withdraw the cutter and then stop the machine. 6.1 The angle of the front edge of the twist drill is 8-12°. When drilling soft materials, the back angle can be appropriately reduced to ensure the strength of the tool; when drilling soft materials (except yellow saw), the back angle can be larger. 6.2 When drilling soft materials, it is generally ground to 118°. The angle must be aligned with the axis of the drill bit, and the length of the two front edges must be consistent. Approved by the State Machinery Industry Bureau in 1998-1116
1998-12-01
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