GB/T 4251-2008 in English
VALIDMachine reamers with carbide tips
- Issued on:2008-11-04
- Implemented on:2009-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$146.00
| Standard No: | GB/T 4251-2008 |
| Document status: | VALID |
| Title in English: | Machine reamers with carbide tips |
| Title in Chinese: | 硬质合金机用铰刀 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2008-11-04 |
| Implemented on: | 2009-04-01 |
| Superseding: |
GB/T 4251-2004 Machine reamers with parallel shanks with carbide tips
GB/T 4252-2004 Machine reamers with Morse taper shanks with carbide tips GB/T 4253-2004 Reamers with carbide tips-Technical requirements |
| ICS Classification: | 25.100.30-Drills, countersinks, reamers |
| Chinese Classification: | J41-Cutting tools |
| Professional Classification: | GB-National Standard |
| Related Keywords: | shank machine reamers
machine reamers morse taper shank machine reamers carbide tips scopethis standard cemented carbide |
| Related Topics: | alloy knife
gb/t4251-2008 GBT4251 GB/T 4251-1984 GB/T 4251-2004 GB/T 4251-2008 Carbide National standard for carbide CNC blades |
《GB/T 4251-2008硬质合金机用铰刀》由TC91（全国刀具标准化技术委员会）归口，主管部门为中国机械工业联合会。
本标准代替GB/T 4251-2004《硬质合金直柄机用铰刀》、GB/T 4252-2004《硬质合金莫氏锥柄机用铰刀》、GB/T 4253-2004 《硬质合金铰刀 技术条件》。
本标准规定了硬质合金直柄、莫氏锥柄机用铰刀的型式和尺寸、位置公差、材料和硬度、外观和表面粗糙度、标志和包装的基本要求。
本标准适用于直径大于5.3mm至20mm的硬质合金直柄机用铰刀和直径大于7.5mm至40mm的硬质合金锥柄机用铰刀。
本标准与GB/T 4251-2004、GB/T 4252-2004、GB/T 4253-2004 相比主要变化如下：
―――将GB/T 4251-2004、GB/T 4252-2004和GB/T 4253-2004 合并为一个标准；
―――对5.2.2铰刀柄部或扁尾部分硬度进行了修改；
―――取消了3.1中“对于常备标准铰刀，直径d的公差为m6。”和“其公差带位置上移0.05IT~0.15IT”的要求；
―――取消了3.3长度公差中“公差”两字；
―――取消了位置公差表6中直径d公差为m6的位置公差要求；
―――表A.1中增加了注；
―――进行了编辑性修改。
Scope
This standard specifies the basic requirements for the type and size, position tolerance, material and hardness, appearance and surface roughness, marking and packaging of cemented carbide straight shank and Morse taper shank machine reamers. This standard applies to hard alloy straight shank machine reamers with a diameter greater than 5.3mm to 20mm and cemented carbide tapered shank machine reamers with a diameter greater than 7.5mm to 40mm.
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