This standard specifies the characteristics of machine bridge reamers with Morse taper shanks. This standard gives the following dimensions of bridge reamers with diameters d ranging from 6 mm to 50.8 mm (0.2362 in to 2.0000 in) in millimeters and inches. --Total length L; --Total cutting edge length l; --Conical cutting edge length l1. The Morse taper shank number for each diameter segment is also given. The dimensions of the Morse taper shank are in accordance with the provisions of GB/T1443. GB/T 4247-2004 Machine bridge reamers with Morse taper shanks GB/T4247-2004 Standard download decompression password: www.bzxz.net

ICS 25. 100. 30
National Standard of the People's Republic of China
GB/T4247—2004/ISO2238:1972
Replaces GB/T4247-—1984
Machine bridge reamers with Morse taper shanks
Machine bridge reamers with Morse taper shanks(ISO 2238:1972,Machine bridge reamers,IDT)Promulgated on 2004-02-10
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaAdministration of Standardization of the People's Republic of China
Implementation on 2004-08-01
This standard is equivalent to ISO2238:1972 "Machine bridge reamers" (English version). For ease of use, this standard has made the following editorial changes: replace the comma "," as a decimal point with a decimal point; replace "this international standard" with "this standard"; delete the international standard foreword;
GB/T 4247-2004/ISO 2238:1972 In the normative references, ISO296 is replaced by GB/T1443 "Self-clamping cone for machine tool and tool handles"; ISO1051 is replaced by GB/T18194 "Rivet shank diameter". This standard replaces GB/T4247-1984 "Taper shank machine bridge reamer" from the date of implementation. Compared with GB/T4247-1984, this standard has the following changes: English dimensions are added;
The surface roughness marking in the GB/T4247-1984 figure is cancelled; the table format is changed according to ISO2238, and the limit deviation regulations of L, l and l1 are changed; the recommended values ​​are listed in Appendix A as regular dimensions; the marking examples are cancelled.
Appendix A of this standard is a normative appendix.
This standard is proposed by the China Machinery Federation. This standard is under the jurisdiction of the National Tool Standardization Technical Committee. The drafting unit of this standard: Chengdu Tool Research Institute. The main drafters of this standard: Fan Jin, Xu Gang. The previous versions of the standards replaced by this standard are: -GB/T 4247--1984.
1 Scope
GB/T4247—2004/IS02238.1972
Machine bridge reamer with Morse taper shank
This standard specifies the characteristics of machine bridge reamer with Morse taper shank. This standard gives the following dimensions of bridge reamer with diameter range d from 6mm to 50.8mm (0.2362in to 2.0000in) in millimeters and inches. Total length L;
Total cutting edge length l;
Conical cutting edge length.
The Morse taper shank number for each diameter segment is also given. The dimensions of the Morse taper shank shall comply with the provisions of GB/T1443. 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, parties that reach 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 is applicable to this standard. GB/T1443 Self-clamping tapers for machine tools and tool shanks (GB/T1443-1996, eqVISO296:1991) GB/T 18194 Rivet shank diameters (GB/T 18194-2000, idt ISO 1051:1999) 3 Dimensions
Taper 1:10
Diameter range d
Figure 1 Machine bridge reamer with Morse taper shank
Table 1 Dimensions
Morse taper shank
Taper shank number
GB/T4247--2004/IS02238:1972 Diameter range d
Note: Unless otherwise specified, these reamers are right-hand cutting. Note 1: Lead-in taper
Table 1 (continued)
The taper of the lead-in part of the reamer is 1:10, which is approximately equivalent to an opening angle of 5°45°. Note 2: Tolerances on length L and 1
122732
3”%2
Taper shank number
L and 1 for each diameter segment can vary, and the upper and lower limits of the variation are the values ​​given by the adjacent larger and smaller diameter segments (if the Morse taper shank of one of the two adjacent diameter segments is larger or smaller than the taper shank of the given diameter segment, the total length will also vary with the length of the two Morse taper shanks).
Example: For a reamer with a diameter of 13 mm, the nominal value of l is 105 mm, which can vary between 100 mm and 115 mm; the nominal value of L is 199 mm, which can vary between 176 mm and 209 mm.
Note 3: Diameter d
The diameter d of the bridge reamer must be determined on the basis of the following principles: Rivet diameter less than 10mm: reamer diameter = rivet diameter + 0.4mm; Rivet diameter greater than or equal to 10mm: reamer diameter = rivet diameter + 1mm; Tolerance of diameter d: k11;
Recommended metric series diameter: see Appendix A. 2
Appendix A
(Normative Appendix)
GB/T4247—2004/IS02238:1972bZxz.net
Recommended diameter of Morse taper shank machine bridge reamer The following Morse taper shank machine bridge reamer diameters are recommended as stock sizes (in millimeters): 6. 4—(7. 4)—8. 4-11—13—(15)--17—(19)—21—(23)—25—(28)—31—(34)—(40). The recommended diameter is equivalent to the rivet diameter of GB/T18194, which is 6mm to 36mm. The dimensions in brackets should be avoided as much as possible.
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