JB/T 7973-1999 This standard is a revision of JB/T 7973-95 "Sine Gauge". During the revision, editorial changes were made according to relevant regulations, and the technical content remained unchanged. This standard specifies the type and size, technical requirements, inspection methods, marking and packaging of sine gauges with accuracy levels of "0" and "1". This standard is applicable to sine gauges with center distances of 100mm and 200mm between two cylinders. This standard was first issued in 1962 as GL 33-62, first revised to GB 4973-85 in March 1985, and adjusted to JB/T 7973-95 in April 1966. JB/T 7973-1999 Sine Gauge JB/T7973-1999 Standard download decompression password: www.bzxz.net

ICS25.060.20
Standard of the Machinery Industry of the People's Republic of China
JB/T7973-1999
Sinebar
Issued on May 20, 1999
National Bureau of Machinery Industry
Implemented on January 1, 2000
JB/T7973-1999
This standard is revised on the basis of JB/T7973-95 "Sinebar". The technical content of this standard is consistent with that of JB/T7973-95, and it has only been re-edited according to relevant regulations. Appendix A of this standard is the appendix of the standard.
This standard replaces JB/T7973-95 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Measuring Tools and Instruments. The responsible drafting unit of this standard: Chengdu Liangqi Cutting Tool Factory. This standard was first issued as GL3362 in 1962, revised to GB4973-85 for the first time in March 1985, and adjusted to JB/T7973-95 in April 1996.
Standard of the Machinery Industry of the People's Republic of China
Sinebar
Sinebar
JB/T 7973-1999
Replaces JB/T7973--95
This standard specifies the type and size, technical requirements, inspection methods, marking and packaging of sinebars with accuracy levels of 0 and 1. This standard applies to sinebars with center distances of 100mm and 200mm between two cylinders. Definitions
This standard adopts the following definitions.
2.1 Sinebar
A measuring instrument that measures angles indirectly based on the principle of sine function and the combined size of gauge blocks. 3 Types and dimensions
3.1 The type of the sine gauge is shown in Figure 1 (the figure is for illustration only and does not represent the detailed structure) Front clapboard
Working surface
Approved by the State Machinery Industry Bureau on May 20, 1999 Center distance of west column
a) Narrow type
Delete plate
Implementation on January 1, 2000
Front baffle
3.2 The basic dimensions of the sine gauge are specified in Table 1. Type
JB/T7973-1999
Medical column center distance L
b) Wide type
(Complete)
Measurement baffle
4 Technical requirements
JB/T 7973—1999
4.1 The working surface of the sine gauge shall not have cracks, scratches, rust, slag inclusions and other defects that seriously affect the appearance and performance. 4.2 The hardness of the main working surface of the sine gauge shall not be less than 664HV, the hardness of the cylindrical T working surface shall not be less than 713HV, and the hardness of the baffle T working surface shall not be less than 478HV.
4.3 The maximum allowable value of the surface roughness R of the main body T working surface of the sine gauge is 0.08±m, the maximum allowable value of the surface roughness R of the cylindrical working surface is 0.04μm, and the maximum allowable value of the surface roughness R of the baffle T working surface is 1.25um. 4.4 The dimensional deviation, geometric tolerance and comprehensive error of the sine gauge are specified in Table 2. Table 2
Deviation of the center distance between two cylinders
Parallelism of the axes of two columns
Deviation of the distance between the center lines of each hole on the main working surface Difference between the diameters of two cylinders of the same sine gauge
Difference between the two cylinders of the working surface of the same sine gauge
Flatness of the main working surface of the sine gauge
Parallelism of the main working surface of the sine gauge with the common tangent plane of the generatrix of the lower part of the two cylinders Verticality of the working surface of the selection plate and the axis of the column Parallelism of the working surface of the front baffle and the axis of the round support Comprehensive error when the sine gauge is installed at 30° 1 The values ​​in the table are given according to the standard 20℃. 2 Within 1mm from the edge of the working surface, the shape and position tolerances are not counted. Narrow type bzxz.net
L=100mm
4.5 All parts of the sine gauge should be demagnetized, and the main body and the round plate must be treated for stability. Level 1
L=200mm
Over the entire length:
Over the entire length
Over the entire length
4.6 The sine gauge should be able to be installed at any angle within the range of 0°~80°. Its structural rigidity and the strength of each part should be able to adapt to the grinding working conditions. Each part should be easy to disassemble and repair.
4.7 The threshold column of the sine gauge should be reliably fixed on the main body with screws, and the threshold column and main body should not be deformed: the screws after tightening should not be exposed on the cylindrical surface. The screw holes for fixing the cylinder on the main body should not be exposed on the working surface. 3
Testing method
5.1 Cylindricity of the working surface of the net column
JB/T7973-1999
As shown in Figure 2a), the cylinder is supported by a 0-level V-shaped frame, and the difference between the maximum and minimum values ​​of the three sections A, B, and C in the middle and at both ends of the entire length of the cylinder is measured with a micrometer with a graduation value of 0.001mm. The cylinder is placed as shown in Figure 2b), and the difference between the maximum and minimum values ​​of the three positions A, B, and C in the middle and at both ends is measured with a micrometer with a graduation value of 0.001mm on four generatrixes (1, 2, 3, 4) separated by 90° on the cylinder. The maximum value of the two measured differences is taken, which is the cylindricity error of the cylinder. Flat plate
5.2 Diameter difference of two cylinders with the same sine rule
As shown in Figure 3, use a micrometer with a graduation value of 0.001mm to measure the actual dimensions at two mutually perpendicular positions aa and bb on the three sections A, B, and C in the middle and at both ends of the full length of the cylinder, and take the average value of these actual dimensions as the diameter of the cylinder. Use the same method to measure the diameter of another cylinder. Calculate the diameter difference of the two cylinders from the diameters of the two cylinders. Figure 3
5.3 Deviation of the center distance between the two cylinders
JB/T7973-1999
As shown in Figure 4, use the plane through the axes of the two cylinders to measure the outer distance A of the two cylinders at the middle position of the full length of the cylinders by comparative measurement.
The actual distance L of the center distance of the cylinder is calculated according to formula (1): d,+d
Wherein: A—actual size measured by the instrument, mm; d,, d,-
-actual diameters of the two cylinders, mm.
5.4 Parallelism of the axes of the two cylinders
As shown in Figure 5a), through the plane of the axes of the two cylinders, measure the actual size of L at the middle and two ends of the entire length of the cylinder at three positions AA, BB, and CC (for narrow sine gauges, only at two positions AA and CC), calculate the difference between the maximum and minimum values, and then calculate the parallelism error of the cylinder axis. Place the main working surface of the sine gauge on the flat plate with the working surface facing downward, as shown in Figure 5b), and measure the parallelism of the generatrix of the two cylinders, and then calculate the parallelism error of the cylinder axis.
Of the above two measurements, take the maximum value as the parallelism error of the two cylinder axes along the length of the cylinder. b
5.5 Flatness of the main body T working surface of the sine gauge
JB/T79731999
On the main body working surface, use a 0-grade blade ruler to verify the flatness of the working surface by the light gap method at the four positions shown in Figure 6. Figure 6
5.6 Parallelism of the main body working surface of the sine gauge and the common tangent plane of each line of the lower part of the two cylinders As shown in Figure 7, place the sine gauge on a flat plate and measure the difference between the maximum and minimum values ​​at the four positions A, B, C, and D of the main body working surface using a micrometer with a graduation value of 0.001mm. Tested strong vision
5.7 Verticality of side baffle T working surface and cylindrical axis JB/T 7973—1999
As shown in Figure 8, place the square box with sine gauge fixed on the flat plate, adjust the sine gauge so that the generatrix of the toilet column is closely fitted and tightened with the 90° angle ruler, and then use the measuring head of the dial indicator to contact the A and B positions at both ends of the side of the sine gauge body, and read the difference between the two readings of the dial indicator. Dial indicator
Test strong frequency
5.8 Parallelism of front baffle working surface and cylindrical axis Flat plate
90*angle ruler
As shown in Figure 9, place the square box with sine gauge fixed on the flat plate, use the measuring head of the dial indicator to contact the A and B positions at both ends of the cylinder, and read the difference between the two readings of the dial indicator. Dial gauge
5.9 Comprehensive error when the sine gauge is set at 30°Drum check positive strength gauge
Front baffle
As shown in Figure 10, use a gauge block to set the sine gauge at 30°, place the side of the 30° first-level angle gauge block close to the T-surface of the side baffle, and then use the graduation value of 0.001mm micrometer, make its measuring head contact with the two ends of the angle block at A and B, and calculate the comprehensive error of the sine rule when the device is at 30° by the difference between the two readings of the micrometer. The comprehensive error of the sine rule 4α is calculated according to formula (2): ab
Aa=arcsin
where: a, b—the readings of the micrometer at points A and B respectively; one is the distance between the two readings of the micrometer at points A and B. The actual value of the angle block should be substituted in the calculation. (2)
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