This standard specifies the principles for determining the relationship between dimensional tolerances (linear and angular) and geometric tolerances. This standard applies to dimensions, dimensional tolerances and geometric tolerances in technical drawings and related documents to determine the size, shape and position characteristics of part elements. GB/T 4249-1996 Tolerance Principles GB/T4249-1996 Standard Download Decompression Password: www.bzxz.net

Cs17.040.1C
National Standard of the People's Republic of China
Shape and position tolerances
Geometrical tolerancing
Published on December 18, 1996
Implemented on July 1, 1997
National Technical Supervision Bureau
GB/T4249-1996
This standard is based on the basic tolerance principle of ISO8015.19858 and is revised on GB4243-84. It is equivalent to TS8015 in technical content. This standard adopts the equivalent of ISO 3215 and has no additions to its content without affecting international exchanges. The content of small entity requirements and reversible requirements has been added to reflect the latest standards, and an appendix has been separately listed to explain the shape tolerance, and some good illustrations in the original GB4249-B4 have been retained. The differences between this standard and GH4249-82 are that the content called "principle" in the original standard is changed to "requirement" except for independent principles, and the relevant content of small entity requirements and reversible requirements is added. The content of the original standard text related to the relevant elements complying with the principle of inclusion is adjusted to a suggestive appendix. The modified shape and position tolerance is the basic standard for the relationship between dimensional tolerance and shape and position tolerance: including the principle of independence, related requirements and other aspects.
This standard will be implemented from July 1, 1997, and will replace B4249. The Appendix A of this standard is an appendix to the standard.
This standard is issued by the Ministry of Machinery Industry of the People's Republic of China. This standard is issued by the National Standardization Technical Association. The drafting unit of this standard is the Machinery Standardization Research Institute of the Ministry of Machinery Industry. The main contributors to this standard are Zhang Fanzhen, Zhou Zhi, and Li Xiaochong. CB/T4249—1996
[ISO Forewordbzxz.net
The International Organization for Standardization is a world-wide federation of national standardization organizations (ISO products). The standard-making process is composed of technical committees of various countries. Each member country has the right to participate in the work of the committee. Other governments or non-governmental international organizations that cooperate with ISO may also participate in the work. ISO and IEC are international electrotechnical commissions! The draft international standard proposed by the technical committee shall be distributed to the member organizations, and at least 7% of the draft international standard shall be used as the international standard. 1215 From 50:10 China Technical Committee on Drawing 5x
National Standard of the People's Republic of China
Tolerance Principles
Toleranelng princdple
CE/T4249-—1996
egvIS0 BC15:1935
CB1219-
This standard specifies the relationship between dimension (dimensional and angular dimension tolerances and form and position tolerances) and applies the dimension, dimension + form and position tolerances in technical drawings and other documents to determine the size, shape and position characteristics of parts.
2 Referenced standards
The following standards contain provisions that constitute technical standard texts through reference in this standard. At the time of publication, the versions shown are all revised. All standards are subject to revision and use of this standard. The following standards should be used to explore the possibility of new products. GB 1182-1596 General rules for shape tolerances. Definition, symbol no. B/1661-1906 Shape and position public welfare and large entity requirements, single small technical requirements and reversibility requirements 3 Independence principle
The country guarantees that each size and shape, position requirements of the piece of size should meet the requirements respectively. If there are specific requirements for the size and shape, the difference between size and position, it should be specified on the drawing. The independence principle is the basic principle of dimensional tolerance and shape and position tolerance for industrial objects. 4 General ||tt| |4.1 Specifications
4.1.1 Linear Dimension Tolerances
Linear dimension tolerances only control the actual size of a part of the object (measured by two points), and do not control the shape error of the element itself (such as the surface error of the parallel plane on the axis of the four-element grid, the secondary error of the shape tolerance, and the individual shape tolerances, element shape tolerances or package requirements control (see Figure 1) National Technical Supervision and Administration Commission of the People's Republic of China approved in December 1961
Implementation on July 1, 1997
Note:
GB/T4249
The actual axis of the local The actual size must be between 149.96 and 150. The size tolerance (0.04) does not control the shape deviation of the sample itself. See Figure 1b.
4.1.7 Angle tolerance
The angle tolerance only controls the angle variation between the ideal element and the measured element, and does not control the shape deviation of the measured element. The position of the ideal element meets the minimum conditions.
The degree tolerance only controls the general direction of the variable element, and does not control its shape deviation. The general direction refers to the direction of the contact line. The contact line is the ideal straight line with the smallest maximum distance from the actual line (2). The actual shape error of the wheel shall be determined by the noted form tolerance or the unnoted shape tolerance. The ideal shape error of the two ideal elements shall be determined according to the minimum requirement in GB/T4249 AB respectively. The angle between the two ideal elements shall be within the given internal limit angle. The angle tolerance does not control the actual shape error of the wheel (3): The actual measurement is obtained by the form tolerance. 4.2 Shape and position tolerance is the ideal measurement of the measured part. No matter what the actual size of the part is, the measured part shall be within the actual form and position tolerance band, and its form and position error is allowed to reach the maximum value (see 4).
Indication:
Marking:
The actual local size of the shaft shall be within the given corresponding shape tolerance. Regardless of the actual local size of the shaft, if any, its shape error (straightness error and roundness error including roundness error) is allowed to reach the given maximum (see figure). 5 Related requirements
Maximum size
GB/T 4249
Five degrees of recognition of light by the production
Jiangsheng single teaching business
Maximum click here to receive lessons
Dimension tolerance and shape and position tolerance are related to the overall requirements of the product size limit:
The most important production
The size tolerance and shape tolerance on the drawing are related to the tolerance requirements, which refers to other tolerance requirements, the large entity requirements (including the delivery requirements and the large separation requirements> and the small actual technical requirements! Including the requirements that can be used for the minimum entity requirements! : 5.1 Tolerance requirements
Including the requirements for the minimum entity requirements! : 5.1 Tolerance requirements
Including the requirements for the application of single requirements such as the birth of the will or the two in the cool: the inclusion requirements are shown in the actual requirements to be followed by the children who are too real and the boundaries are too real, showing the actual unit of the residence shall not be the most real entity: the use of the abandonment requirements range bird one requirement should be the heart of the heart of the extreme double or public and false code See the whole example after the annotation symbol\see the whole example:
Annotation instructions:
The measured surface must be within the maximum actual measurement range, 16 away from the boundary, and the actual size is not less than 14.56 Figure 7)
International
Cl/T4249—1996
British Chinese
Salt people this body size in the business logic number shape soft package variable surface creation international
5.2 Large entity requirements
The maximum point entity requirement applies to the center element,
and the female body size logic number shape has no surface
The actual diameter of the size part
The large entity requirement is a public requirement to control the actual wheel of the measured requirement" within its maximum actual physical effectiveness boundary: when its actual small insurance is within the maximum actual physical size! , the shape and position error value exceeds the specified value: the symbol " " is marked on the figure, and the marking method is shown in GB/T1183.
When the shape and position error is less than the given shape and position tolerance, the document allows the actual size to control the maximum size of the body, and the reversible integral seat can be opened by 4 degrees: at this time, the symbol "" should be marked after the shape and position tolerance value required by the invisible body in the invisible position specification, and the specific marking method is shown in GB/T1667.
5.3 Minimum size requirements
The minimum entity requirement is applicable to the center of the design. The minimum size requirement is to control the actual size of the measured object within the effective boundary of the minimum entity and the tolerance requirement. When the actual size is smaller than the actual size, the shape and position error value exceeds the given size, and the symbol "" is marked on the figure column. 1132.
When the shape error is less than the wheel shape tolerance, and the actual size is allowed to exceed the minimum actual size, the reversible requirement can be met. At this time, the shape tolerance is based on the minimum actual size requirement. The shape tolerance is marked with the number "". The shape tolerance is based on the drawing marking of GB/115571
6 Tolerance principles
Drawings or technical documents using this standard should indicate: Tolerance principles are based on B 4.65||tt ||GB/T4249
Appendix A
also mentions
shape tolerance
When the associated elements comply with the maximum entity boundary, the zero shape tolerance required by the maximum entity can be applied. When the associated elements are used to adopt the entity requirements and the shape tolerance is marked, it is required that the actual size shall not exceed the maximum actual size boundary. The boundary shall maintain a given geometric relationship with the reference sample. The actual size of the contour of the actual piece shall not exceed the smaller actual size. Example:
b7: 1 ozs
and a certain datum plane A perpendicular
to the maximum physical boundary
shadow limit|||mark juice explanation,
the maximum physical boundary
wind section actual dimension
circular surface must be within the measurement actual limit: the size of the selected limit is the maximum physical dimension 5U, and it is perpendicular to the datum plane A. The actual hanging local belt damage size shall not be less than 49.975 (see Figure A1), 5.1
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