This standard specifies the basic requirements for the position tolerance, material and hardness, appearance and surface roughness, marking and packaging of conical reamer. This standard applies to Morse taper and metric taper reamers produced according to GB/T1139. GB/T 4250-2004 Technical conditions for conical reamer GB/T4250-2004 Standard download decompression password: www.bzxz.net

ICS 25. 100.30
National Standard of the People's Republic of China
GB/T4250-—2004
Replaces GB/T4250-1984
Taper reamers
Technical conditions
Taper reamers-Technical requirements2004-02-10 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
2004-08-01 Implementation
This standard replaces GB/T4250-1984 "Technical Conditions for Taper Reamers" from the date of implementation. The main changes of this standard compared with GB/T4250-1984 are as follows: - The performance test part in GB/T4250-1984 is cancelled; the material of reamer in GB/T4250-1984 is modified; the marking and packaging part in GB/T4250-1984 is modified; surface roughness is added.
This standard is proposed by China Machinery Industry Federation. This standard is under the jurisdiction of the National Tool Standardization Technical Committee. Drafting units of this standard: Henan No. 1 Tool Factory, Henan Mechanical and Electrical College The main drafters of this standard: Zhao Jianmin, Kong Chunyan, Ma Xiao. Previous publications of the standards replaced by this standard: -GB/T4250-1984.
GB/T4250-2004
1 Scope
Conical reamer
Technical conditions
GB/T4250-2004
This standard specifies the basic requirements for the position tolerance, material and hardness, appearance and surface roughness, marking and packaging of the conical reamer. This standard applies to the Morse taper and metric taper reamers produced in accordance with GB/T1139. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to the agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T1139 Mohs taper and metric taper reamers (GB/T1139-2004, ISO2250:1972, MOD) 3 Reamer position tolerance
The position tolerance of the reamer is shown in Table 1.
Radial runout of the working part and the handle to the common axis 4 Materials and hardness
4.1 Materials
Unit is mm
The reamer is made of W6Mo5Cr4V2 or other grades of high-speed steel with equivalent performance, and can also be made of 9SiCr or other alloy tool steels with equivalent performance. The handle of the welding reamer is made of 45 steel or other grades of steel with equivalent performance. 4.2 Hardness
Reamer working part: bzxZ.net
High-speed steel reamer: hardness is 63HRC~66HRC; alloy tool steel reamer: hardness is 62HRC~65HRC. 4.2.2 Square head or flat tail of the shank:
Integral reamer: hardness is 40HRC~55HRC; welded reamer: hardness is 30HRC~45HRC. 5 Appearance and surface roughness
5.1 Appearance
The reamer surface shall not have defects such as cracks, scratches, rust and grinding burns that affect the performance. 5.2 Surface roughness
Upper limit of surface roughness:
Front, conical land: Rz3.2um;
Rear: Rz6.3μmz
-Cylindrical shank: Ral.6μm;
GB/T4250—2004
Mohse taper shank: Rao.4μm.
6 Marking and packaging
6.1 Marking
6.1.1 The product should be marked with:
The trademark of the manufacturer or seller;
The cone code (for example: metric 4);
The material code (HSS is for high-speed steel, and no mark is required for alloy tool steel). 6. 1.2
The packaging box should be marked with:
The name, address and trademark of the manufacturer or seller; the product name, cone code, standard number; material brand or code;
The number of pieces;
The year and month of manufacturing.
2 Packaging
The reamer should be treated with rust prevention before packaging, and the packaging must be firm to prevent damage during transportation. 2
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.