This standard specifies the method of indicating center holes. This standard applies to standard center holes that do not need to be accurately indicated in mechanical drawings. Non-standard center holes can also be used as a reference. GB/T 4459.5-1999 Method of indicating center holes in mechanical drawings GB/T4459.5-1999 Standard download decompression password: www.bzxz.net

ICS 01. 10C. 30
National Standard of the People's Republic of China
GB/T4459.51999
eqiso6411:1982
Mechanical drawings
Mechanical drawingsRepresentation of centre holes1999-09-03Published
2000-03-01Implementation
Published by the State Administration of Quality and Technical Supervision
GB/T 4459.5—1999
This standard is compiled based on 1506411:1982 method for indicating center holes in technical drawings. It is equivalent to the international standard in technical content. This standard amends and replaces B/4459.E—1984 method for indicating center holes in mechanical drawings to make the center hole indication consistent with international standards. This standard is to meet the needs of international capital trade, technical and economic exchanges. The center hole is a special indication in the drawing. According to the needs, this standard mainly supplements the following: 1. The mark and indication of C-type center hole are added. 2: The standard for omitting the center hole mark in the standard is simplified, 3: The code in Table A1 of Appendix A is replaced by G145, the guide hole diameter d specified in 16-11 is replaced by . The tapered hole diameter specified in JS0(41) is replaced by . (1) Type A and DB) || TT || The relevant Appendix A of the standard is a reminder of the Appendix B. This standard is produced by the National Standardization Administration of China. This standard is issued by the Technical Committee of the State Council. This standard is issued by the China Machinery Standardization Institute, Chongqing Machinery Manufacturing School, and Bohai Jiangping Machine Tool Co., Ltd. The six main initiators of the standard are Donghuan Chang, Shuhan Chen, Ying Hou, Ju Huang and Jianguo Lai. H/T 4459.51999
ISo (International Organization for Standardization) is a worldwide joint organization composed of international standardization bodies (ISO member bodies). The work of formulating international standards is completed by the technical committees of ISO. If each member body is interested in the principles established by the technical committee, it is entitled to participate in the work of the committee. Any organization (official or unofficial) that maintains contact with IS may also participate in the relevant work. In the field of electrotechnical standardization, the 1S Center maintains a closed relationship with the International Electrical Engineering Committee (1E Center). The international standard proposals passed by the technical vertical committee shall be submitted to the member groups for voting. They must be approved by at least 75% of the member groups to be formally issued as international standards. The international standard TS) (41) is drafted by the International Organization for Standardization SO/TC!\Technical Drawing Product Definition and Related Documents Technical Committee. 1 Scope
National Standard of the People's Republic of China
Mechanical Drawing
Center Hole Representation
Meclanicil drawings-Represenlation p rentre The holes standard specifies the representation of the center hole
GB/T44595—1999
eqv1506411:1982
Generation 84459.51984
This standard is applicable to standard center holes that do not need to accurately indicate the shape and structure in mechanical samples. Non-standard center holes can be used as references
2 Reference standards
The following standards contain all the clauses, which constitute the clauses of this standard through reference in this standard. When the major standards are published, the versions shown are effective. All standards will be revised from time to time. The parties using the technical standard names should consider the possibility of making the following standards become discontinued versions. GB1—1985 Center hole ( Valid in 2009 (G/10409.41989 Technical drawings requirements for micro-reproduction originals (valid in 2000) GB/12691:1893 Technical fonts
GB/T1 Technical drawing lines
3 Symbols for center holes
In machine drawing inspection, etc. 4 Requirements for retaining center holes generally have certain types: a) It is required to retain center holes on finished parts; 6) It is allowed to retain center holes on finished parts; 3.2 5
In order to express the requirement of whether to retain center holes on finished parts, the symbols specified in the table can be used: Scale of center hole symbols Appendix Tips Appendix.
4 Marking of center hole
2.1 The marking of R type (arc), A type without guard chain) and A type (cone guard) center holes includes the frequency number type (blade mother R, A or length indicates the guide diameter: the end face diameter of the arc hole, for example, the center hole of A type is 2.5mm, =m
The marking on the drawing is: G/T4459.5-3.5/84.? (The marking of A type (with screw) center hole refers to the standard number type; the elasticity code H is represented by the ordinary code M and the nominal diameter); the number of screws (indicated by the letter 1) and the end face diameter D of the arc hole. For example, the center hole of type C, M30m16.3mm
The mark on the sample is: G-CMG[./.
4.2 The mark of the four standard center references is shown in Table 2. The center parameters not included in the sample are shown in Appendix A (Appendix: Approved by the State Administration of Quality and Technical Supervision on September 3, 1999 and implemented on March 1, 2000
On the completed work
In the complete. 1. In the pregnancy work, the center is not allowed to guarantee the type of the center billion. According to the H14 delivery rate center station with tube) G/114 into the center station (with protection standard) according to the H14 delivery system center (with smoke effect) low G [1 + delivery ten center station 1) F record A, CB/T 4459.5—1999
Method of production
ICB/T 4459. 5-Pe. 5,'6
(M/T c459.5 M/6.5
EG3/T 44E2 5-A1.5/3.35
(H/T 44E9.5·R3.15/K.7
(G3/7 4459. 5-44/8. 5
(27) 4459. 5-H3, E/8
GR/T 4159.5-CM10).30/
2 The most important factor in determining the length of the center hole is that the unit can be less than
3) Size 1 is based on the kinetic energy requirements of the component involved. Use a center hole. 2. h unt, n
The finished space
Use A-type center hole
D-4nD-S.tm
On the finished inner half, the part can be guaranteed to be used. A-type center hole
L=I.nmD=s.35uu
The finished rate is not guaranteed to be damaged. Zhang Ming
-b. 15 mu.
D, -6. Juu
D- 4 :o:b
1)-M:0
L-30mm
5 Variable representation method of center hole
5.1 Specified representation method
GB/T4459.5—1999
5-11 For center holes that have corresponding standards, it is not necessary to draw their detailed structure in the drawing. It is only necessary to make the symbol of the center requirement on the end face of the flat shaft, and then mark the corresponding basis. The examples of the current specified representation method of the center hole are shown in the table: 5.1.2 If it is necessary to specify the standard number in the center hole mark, it can be marked according to the method of Figure 1 and Figure 2. AM/B,5
GZT 4459.5
cVran/163
5E/T44:9.:
5.1.3 When the center line is used as the step standard, the reference code can be generated by the method of Figure 3 and Figure 4, CF/ 4459. 5-F1/3. 15
2x Gn/T 44.5-82/ e. a
5.1.4 The roughness of the center T line should be marked on the lead line, as shown in Figure 3 and Figure 4. 5.2 Simplified representation
5.2.1 In case of no misunderstanding, the standard screen number in the mark can be omitted, as shown in Figure 5, XR3.15/E.bzxZ.net
5.2.? If the center holes at both ends of the same shaft are layered, they can be marked only on the label, but the number should be noted. There is no Figure 4 and Figure 5, GB/T4459.5—1999
Appendix A
(Appendix for reference)
Related drawings of R, A, B and C center nipples. The dimensions required for marking the standard center hole are shown in Table 1. The center hole can be marked with other dimensions. See Table A1 (for R, A and R types)
Universal center
Method of calling small
: Avoid using the dimensions in the number,
International size
International size
B1 Basic requirements
Test size
|tt|| (for type)
(for example)
The ratio and size of the center rolling symbol
The size of the center hole symbol is consistent with the other sizes and symbols on the drawing, and the nominal
.1The line width of the center hole symbol (\) is equal to the corresponding height of the numerals on the rod (dot 1/1).3
B1.? The number letter of the center mark ten is selected according to the provisions of B/114691, and should be consistent with the ratio, body type, body width [) and character loss () on the drawing.
B1.3 The size of the adjacent drawing should be in accordance with the relevant regulations of CR/T17450 and (/T10%09.4, note that this is called the maximum and minimum of 0.7mm.
B2 Proportion
GB/T4459.5-1999
The ratio of the center hole symbol to the end mark area of ​​the wear part is shown in Figure 1. Note: Except for the hole mark,
B3 size
and the middle symbol have the same size as 1.
The lower and upper scale
symbols are
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