This standard specifies the types and dimensions of carbide Morse taper shank machine reamers. This standard applies to carbide Morse taper shank machine reamers with diameters greater than 7.5mm to 40mm. GB/T 4252-2004 Carbide Morse taper shank machine reamers GB/T4252-2004 Standard download decompression password: www.bzxz.net

ICS25.100.30
National Standard of the People's Republic of China
GB/T 4252--2004
Replaces GB/T4252—1984
Machine reamers with Morse taper shanks with carbide tips
Machine reamers with Morse taper shanks with carbide tipsPublished on 2004-02-10
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of the People's Republic of China
Implemented on 2004-08-01
This standard replaces GB/T4252—1984 "Machine reamers with carbide taper shanks" from the date of its implementation. Compared with GB/T4252-1984, the main changes of this standard are as follows: GB/T4252-2004
cancels the reference dimensions in Table 1 of GB/T4252-1984: αpf, number of teeth and carbide insert model; -modifies the reference dimensions and surface roughness in Figure 1 of GB/T4252-1984; -adds marking examples;
-adds the diameter tolerance of carbide taper shank machine reamer: m6; adds the normative appendix "Diameter tolerance of carbide taper shank reamer for H7, H8 and H9 grade holes". Appendix A of this standard is a normative appendix.
This standard is proposed by China Machinery Industry Federation. This standard is under the jurisdiction of the National Lizhen Standardization Technical Committee. The drafting units of this standard are: Henan No. Tool Factory, Shanghai Tool Co., Ltd., Shenyang Xinguang Huachen Automobile Engine Co., Ltd. The main drafters of this standard are: Zhao Jianmin, Kong Chunyan, Huang Deming, Wang Yiting. Previous publications of the standards replaced by this standard: -GB/T 4252—1984.
1 Scope
Cemented carbide Morse taper shank machine reamer
This standard specifies the types and dimensions of cemented carbide Morse taper shank machine reamer. This standard applies to cemented carbide Morse taper shank machine reamer with a diameter greater than 7.5mm to 40mm. 2 Normative references
GB/T 4252--2004
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 an 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/T1443 Self-clamping taper for machine tool and tool shanks (GB/T1443-1996, eqvISO296:1991) Special tolerances for reamer (GB/T4246-2004, ISO522:1975, IDT) GB/T4246
GB/T4253 Technical conditions for carbide reamers 3 Tolerances
3.1 Cutting part
For standard reamers, the tolerance of diameter d is m6. For the diameter tolerance of machining specific tolerance holes, refer to the provisions of GB/T4246 for design, and the position of the tolerance band is moved up by 0.05IT~0.15IT. Appendix A of this standard gives the diameter tolerance of reamer for machining H7, H8, and H9 grade holes.
3.2 Morse taper shank
The dimensions and tolerances of the Morse taper shank of the reamer shall comply with the provisions of GB/T1443. 3.3 Length tolerance
The length tolerance of reamer is shown in Table 1.
Table 1 Length tolerance of reamer
Total length L, cutting edge length 1, straight shank length greater than
Type and size
The type and size of reamer are in accordance with Figure 1 and Tables 2 and 3. The teeth can also be made into spiral teeth or helical teeth as required. Unit: mm
GB/T4252-2004
α is determined during design according to the use conditions.
Preferred size
Morse taper shank
Morse taper shank
Unit: mm
Morse taper shank number
Note: Dimensions in brackets should be avoided as much as possible.
Diameter range d
Table 2 (continued)
Table 3 Dimensions divided by diameter
GB/T 4252—2004
Unit: mm
Morsch taper shank number
Unit: mm
Morsch taper shank number
GB/T4252—2004
Diameter range d
5Marking example
Table 3 (continued)
Unit: mm
Morsch taper shank number
Diameter d=20mm, tolerance m6, Morse taper with carbide insert with application classification code P20 The machine reamer with Morse taper shank is: Carbide Morse taper shank reamer 20--P20GB/T4252-2004 with diameter d=20mm, used for processing H8 grade precision holes. The machine reamer with Morse taper shank welded with carbide blade with use classification code P20 is:
Carbide Morse taper shank reamer 20H8-P20GB/T4252---2004
6 Technical conditions
The technical conditions of carbide Morse taper shank machine reamer shall comply with the provisions of GB/T4253. Diameter range d
>7.5~10.0bzxZ.net
>10.018.0
>18.0~30. 0
>30. 0~40. 0
Appendix A
(Normative Appendix)
Diameter tolerance table of carbide Morse taper shank reamers for machining H7, H8 and H9 grade holes A.1
Limit deviation
GB/T4252—2004
Unit: mm
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