JB/T 10045.3-1999 This standard is a revision of ZB J59 002.3-88 "Quality and Dimensional Deviation of Thermal Cutting Gas Cutting". During the revision, only editorial changes were made according to relevant regulations, and the technical content was not changed. This standard specifies the gas cutting quality grade, dimensional deviation and measurement method. This standard applies to gas cutting methods for gas oxygen flame cutting. This standard was first issued on August 10, 1988. JB/T 10045.3-1999 Quality and Dimensional Deviation of Thermal Cutting Gas Cutting JB/T10045.3-1999 Standard download decompression password: www.bzxz.net

This standard is a revision of JB/T10045.3—1999
Gas cutting quality and dimensional deviation. Only editorial changes were made during the revision. This standard is a revision of ZBJ59002.3—88 "Thermal cutting". The main technical content of this standard remains unchanged.
This standard replaces ZBJ59002.3-—88 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Welding Standardization. The responsible drafting unit of this standard is Harbin Welding Research Institute. The main drafters of this standard are Lu Pi and Yin Jizhong. This standard was first issued in 1988, and this revision is the first revision. 626
1 Scope
Machinery Industry Standard of the People's Republic of China
Thermal cutting
Gas cutting quality and dimensional deviation
Thermal cutting-Quality and dimensional deviation in the gas cutting This standard specifies the gas cutting quality grade, dimensional deviation and measurement method. This standard applies to the gas cutting method of gas-oxygen flame cutting. 2 Cutting conditions and cutting materials
2.1 Cutting conditions
2.1.1 The combustion temperature of the metal being cut is lower than the melting point of the metal. JB/T10045.3-1999
Replaces ZBJ59002.3-88
2.1.2 After the metal being cut reaches the combustion temperature, it can burn violently in the oxygen flow, and the melting point of its oxidized slag is lower than the melting point of the metal and is easily discharged by the cutting oxygen flow.
2.1.3 The sum of the heat generated by the metal being cut in the oxygen flow and the heat provided by the preheating flame can keep the incision at the combustion temperature. 2.2 Cutting materials
Pure iron, carbon steel, low alloy steel, titanium and some titanium alloys can generally meet the cutting conditions specified in 2.1: However, as the alloy components (except manganese) of the metal being cut, such as chromium, carbon, molybdenum and silicon content, increase, the difficulty of the cutting process will increase. 3 Cutting surface quality
The cutting surface quality is graded according to the three parameters of cutting surface flatness u, cutting depth h, and minimum spacing of notches L. The drag n, upper edge melting degree r, and slag are not graded. The cutting surface quality of X, Y, V, and K-shaped incisions should be assessed separately for each cutting surface. 3.1 The cutting surface quality grade is divided into two levels: I and II (see Table 1). The value range of the cutting surface flatness u and cutting depth h is shown in Figures 1 and 2. The minimum spacing L of notches in Grade I quality should be greater than or equal to 2000mm; the minimum spacing L of notches in Grade I quality should be greater than or equal to 1000mm.
Table 1 Classification of Cutting Surface Quality
Cutting Surface Quality
Cutting Surface Flatness u
Grade 1 and Grade 2
Grade 1 to Grade 3bzxZ.net
Cutting Depth h
Grade 1 and Grade 2
Grade 1 to Grade 3
3.2 When there are special requirements, the quality of the cutting surface can also be agreed upon by the supplier and the buyer. The agreed cutting surface flatness u, cutting depth h and the minimum spacing L of notches should be indicated on the drawing, as shown in 6.3b). 4 Workpiece Dimension Deviation
The dimensional deviation of the workpiece refers to the difference between the basic size of the workpiece and the actual size after cutting. The actual size should be measured after the incision has been cleaned and cooled to room temperature.
Approved by the National Machinery Industry Bureau on June 24, 1999
Applied on January 1, 2000!
JB/T 10045.3—1999
The workpiece size deviation is shown in Table 2. The size deviation includes the deviation caused by the flatness of the cutting surface. mm
Cutting thickness
50~100
50~100
F 130
- 60 -
2 etc. 0. 57
60 6370
Cutting surface flatness u (the numerical value indicates the upper limit) 250
60 III
Cutting depth h (the numerical value indicates the upper limit)
Table 2 Workpiece size deviation
Basic size
35～315
Note: The workpiece size deviation listed in the table is applicable to: a) dimensions without tolerance on the drawing;
b) workpieces with an aspect ratio less than or equal to 4:1, c) workpieces with a cutting circumference greater than or equal to 350mm. 5 Determination of cutting surface quality
5.1 Cutting surface quality sample, measuring instrument and measuring tool315~1000
Inch range
1000～2000
2000~4000
The cutting surface quality sample is used as a comparative sample for identifying the cutting surface quality. This sample is measured on site for comparison, and the cutting surface quality grade obtained by comparison is used as the evaluation result.
JB/T10045.3—1999
The values ​​of the cutting surface flatness u and the cutting depth h can be measured by measuring instruments and measuring tools respectively. 5.2 Measuring method
5.2.1 Measuring conditions
When measuring the cutting surface flatness and the cutting depth h, it should be carried out on the cutting surface without defects. The measurement should not be carried out at the beginning and end of the cutting, and the distance from the beginning and end should be specified in the technical conditions. The upper side of the flame-cut workpiece is regarded as the reference plane, which must be flat and clean. 5.2.2 Measuring position and number of measurements
The number and position of the measuring position are related to the shape and size of the workpiece, and sometimes to the application purpose (for example, on the gear surface that is no longer processed after flame cutting). The specific regulations are as follows: a) Level I has at least two measuring positions per meter of cutting length. Each measuring position u is measured 3 times, each with a distance of 20mm; h is measured once,
b) Level I
has at least .= measuring positions per meter of cutting length. Each measuring position u is measured 3 times, each with a distance of 20mm, and h is measured once;
c) The measuring position of h is two-thirds of the thickness of the cut from the upper edge of the cut. 6 Marking method
6.1 The marking method of cutting surface quality grade and workpiece dimensional deviation on the drawing is as follows:@@?
Wherein: ① Mark the cutting surface quality grade according to Chapter 3; ② Mark the workpiece dimensional deviation accuracy according to Chapter 4; ?Mark this standard number.
6.2 If all cutting surfaces of a workpiece require the same quality grade and workpiece dimensional deviation, then " is marked in the upper right corner of the sample; if it is a certain cutting surface quality requirement, then " is marked in the upper right corner of the sample; if it is a certain cutting surface quality requirement, then " is marked in the upper right corner of the sample; 6.3 Drawing marking example
a) Specified grade:
Indicates: According to JB/T10045.3;
The cutting surface quality is level 1 and grade 1:
The workpiece dimensional deviation is level A.
b) Agreed grade:
” points to the cutting surface.
1A JB/T10045.3
ul.1 h0.15 L500 B
” is marked on the drawing
, indicating: cutting surface quality: cutting surface flatness u≤1.1mm, cutting depth h≤0.15mm, minimum notch spacing L=500mm. The workpiece size deviation is Class B.
ul.1 ho.15 B
indicates: cutting surface quality: cutting surface flatness u≤1.1mm, cutting depth h≤0.15mm, minimum notch spacing L is not required. The workpiece size deviation is Class B.
6.4 Contents not included should be explained in the technical conditions of the drawing. 629
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