HG/T 2637-1994 Testing methods for geometric dimensions of glass-lined parts
Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2637-94
Methods for testing geometric dimensions of sugar glass parts
Published on October 26, 1994
Ministry of Chemical Industry of the People's Republic of China
Implementation on March 1, 1995
Chemical Industry Standard of the People's Republic of China
Methods for testing geometric dimensions of sugar glass parts
Subject content and scope of application
HG/T2637-94
This standard specifies the test items and test methods for geometric dimensions and deformation of sugar glass parts. This standard is applicable to the test of geometric dimensions and deformation of pond glass parts specified in the standard HG2432 "Technical Conditions for Sugar Glass Equipment". In order to adapt to the detection of new parts, the test items have been expanded. , 2 Reference standards
HG2432
"Tang Glass Equipment Technical Conditions"
Test items and test methods
3.1 Maximum and minimum diameter difference and diameter deviation of flange 3.1.1 Measuring tool:
Meter ruler: accuracy 0.05 level, graduation value 1.0mm, 3.1.2 Test method:
, use meter ruler to measure flange outer diameter, and measure by symmetrical segmentation method until the measurement deviation is <1mm, 3.1.3 Calculation:
The difference between the maximum and minimum values measured is the maximum and minimum diameter difference, and the difference between the average value of no less than 4 measurements and the standard diameter of the flange (flange outer diameter indicated on the drawing) represents the nominal diameter deviation, 3.2 Flange flatness
3.2.1 Measuring tool:
Feeler gauge *
Flatness standard circle: Technical requirements for standard circle, width>5mm, roundness error<0.001Dg.3.2.2 Inspection method:
Place the flat standard circle of the same specification as the flange to be measured on the surface of the flange to be measured in a concentric position, and then use a feeler gauge to measure the maximum gap between them, which is the flatness of the flange. 3.3 Simplified maximum and minimum diameter difference
3.3.1 Measuring tool:
Inner diameter telescopic gauge: accuracy level 0.05, graduation value 1.0mm Approved by the Ministry of Chemical Industry of the People's Republic of China on October 26, 1994 and implemented on March 1, 1995
*Calculating instruments (including self-made ones) without indicating the accuracy requirements shall meet the minimum first-level accuracy specified in the corresponding technical standards during measurement and calibration. 3.3.2 Test method:
HG/T2637-94
Take the section with the largest deformation of the tested tank body. If it is impossible to distinguish, take the middle section of the cylinder body. Take the maximum diameter position obtained by measuring the maximum and minimum diameter difference as the base point, and use the symmetrical segmentation method to make 4 measurements. 3.3.3 Calculation:
The difference between the maximum and minimum values measured in 4 times is the maximum and minimum diameter difference of the cylinder body. 3.4 Parallelism of the nozzle flange of the stirring shaft hole to the tank cover flange 3.4.1 Measuring tool:
Straight ruler: The straightness accuracy of the working surface is 0.05 level, and the length is ≥ the outer diameter of the tank cover flange to be measured. Square ruler: accuracy <0.05 level, length ≥ distance between the flange surface of the stirring hole of the tank cover to be tested and the flange surface of the tank cover Parallelism standard pad: diameter > outer diameter of the stirring hole flange of the tank cover to be tested, flatness of the upper and lower planes <0.0002D, parallelism <0.1°
3.4.2 Detection method:
The tank cover is buckled on the platform, and the center line between the manhole and the middle hole is used as the reference line. The working surface of the ruler is placed on the plane of the stirring hole flange through the center. The height from the platform at the outer circle of the tank cover flange to the two ends of the lower plane of the ruler (H large, H small or H' large, I' small) is measured with a square ruler, and 4 measurements are made using the symmetrical segmentation method. (When the manhole flange of the tank cover affects the measurement, take the parallelism standard pad and place it on the stirring hole to be measured for measurement). (See Figure 1)
3.4.3 Calculation:
Subtract the heights of the four groups of symmetrical points to obtain four height differences, the maximum of which is the parallelism of the flange of the pipe mouth of the mixing shaft hole to the tank cover flange. 3.5 Flange clamping surface width
3.5.1 Measuring tools:
Ruler: thickness 5.0mm, width 50mm, working surface straightness accuracy 0.05 level.
Feeler gauge: two 0.50mm gauges.
① In order to prevent damage to the tank cover, it is allowed to replace the platform with a high-neck flange with the same diameter as the tank cover flange to be measured and qualified for surface calibration. Figure 2
3.5.2 Test method:
HG/T2637--94
Put the ruler on the plane of the flange to be measured through the center side, insert two 0.50mm feeler gauges parallel to the two sides of the clamping surface, and then use the ruler to measure the distance b between the two feeler gauges (see Figure 2). Using the symmetrical segmentation method, make 4 measurements on the entire flange plane according to the above method, and take the minimum value as the width of the flange clamping surface
3.6 Manhole flange flatness
3.6.1 Measuring tool:
Flatness standard plate: thickness>10mm, working surface flatness<0.20mm; feeler gauge,
3.6.2 Test method:
Put the flatness standard plate on the plane of the manhole flange to be measured, and then use the feeler gauge to measure the minimum distance between the manhole flange and the working surface of the standard plate. The largest gap is the flatness of the manhole flange.
3.7 The position of reducer supports relative to each other and to the center hole 3.7.1 Measuring tool:
Caliper: Graduation value <0.1mm.
3.7.2 Detection method:
Use a caliper to measure the distance between the inner hole walls of adjacent supports, and the difference between the maximum and minimum values is the position of the supports relative to each other. Use a caliper to measure the distance between the inner hole wall of the support and the outer circular wall of the center hole flange, and the difference between the maximum and minimum values is the position of the support relative to the center hole. 3.7.3 Value selection:
The larger of the position accuracy between the supports and the position accuracy of the supports to the center hole is the position accuracy between the supports and to the center hole. 3.8 Average radial circular runout of the sealing section of the stirring shaft 3.8.1 Measuring tool:
Vernier indicator: graduation value 0.01mm;
Test stand: vertical, on which the tested stirring machine can be installed and can rotate smoothly, the frame with coupling, the radial runout of the output end of the rotating shaft is <0.1mm (or planetary tester, when it has the same accuracy as the above test stand, the two are equivalent).
3.8.2 Test method:
Vertically install the tested agitator on the test stand (see Figure 3), use the dial indicator measuring head to vertically press against a certain point in the sealing section L of the agitator shaft, rotate the central shaft, and record the maximum and minimum readings of one rotation. The difference is the circular runout on the measuring section of the shaft. Continue to make the same measurement at points 10 mm apart in the L section, and the total number shall not be less than 5 times. Calculate their average value, which is the average circular runout.
3.8.3 Calculation:
The arithmetic mean of the N radial circular runouts in the L section is, It is the radial average circular runout of the sealing section of the stirring shaft,
Note: L in the figure is the length of the sealing section of the stirring shaft
① This item is the radial total runout of the sealing section of the stirring shaft in HG2432, but this project has not been tested according to the requirements of form and position tolerances for many years. The reasons are: 1. The stirring is not a mechanical part but a component, and it is difficult to test the tooling; 2. The glass stirring part is not a pure machined part, and its accuracy cannot meet the total runout requirement. In order to make the test operational and consistent with the actual use requirements, this standard replaces the radial total runout of the sealing section of the stirring shaft with the radial average circular runout. 3
3.9 Radial runout of the lower end of the stirrer
3.9.1 Measuring tool:
Same as 3.8.1,
3.9.2 Testing method:
HG/T2637-94
Install the stirrer to be tested vertically on the test stand, and use the dial gauge measuring head to vertically lean against the measurable part of the lower end of the stirrer (the cylindrical surface where the dial gauge can be installed), (when encountering a spherical surface or a weld, it should be about 25±5mm away), rotate the central axis, and record the maximum and minimum readings of one rotation. The difference is the circular runout on the measuring section of the axis, and represents the radial circular runout of the lower end of the stirrer. 3.10 Thermometer sleeve (baffle) straightness 3.10.1 Measuring tool:
Platform: flatness accuracy 0.05 grade; (or straight ruler with straightness accuracy 0.05 grade) feeler gauge.
3.10.2 Test method:
Place the thermometer sleeve to be tested on the platform (or use the side working surface of the ruler to vertically stick to the pipe wall of the tested object along the axial direction), rotate it for a week, and use a feeler gauge to measure the maximum gap between the pipe wall and the platform (or ruler), which is the straightness of the thermometer sleeve. 3.11 Symmetry of the anchor and blade of the agitator (width deviation of the anchor, frame, paddle and impeller; angle deviation of the impeller blade angle and upward angle) 3.11.1 Measuring tools:
Caliper;
Ruler;
Right-angle ruler;
Angle ruler;
3.11.2. Testing method:
, Width deviation: Place the mixer to be tested flat, place a ruler perpendicular to the main axis horizontally on the upper end of the anchor blade, and then use the ruler edge as the reference line to measure the width ab, cd, etc. of the widest part of the anchor blade (see Figure 4) with a square ruler, and take their extreme difference as the width deviation; Figure 4
b. Blade angle deviation: Use a ruler and an angle ruler to measure angles α, β, and angle as shown in Figure 5, and take half of the same group of extreme differences as the blade angle deviation;
c. Blade upturn angle deviation: Use a square ruler and an angle ruler to measure the angles α, β, and c. Measure angle α and angle β as shown in Figure 6, take their average value as the blade warping angle, calculate half of the extreme difference of the blade warping angles in the same group as the blade warping angle deviation, 3.12 Pipe straightness
3.12.1 Measuring tool:
Same as the thermometer sleeve
HG/T2637-94
3.12.2 Measuring method:
Put the measured pipe on the platform according to Figure 7, rotate it for one circle, and use a feeler gauge to measure the maximum gap between the pipe and the platform, which is the pipe straightness,||tt| |Verticality of pipe fitting flange to pipe
3.13.1 Measuring tools
Platform: flatness accuracy 0.05 grade;
Parallelism standard pad;
Special square ruler: the long side should be equal to the straight side of the pipe, feeler gauge,
3.13.2 Testing method:
Place the flange end of the pipe to be tested on the platform. To avoid the arc transition area of the pipe flange, place a parallelism standard pad close to the flange edge, then use a square ruler to press against the pipe wall (as shown in Figure 8), rotate the pipe Use a feeler gauge to measure the maximum distance △L between the upper end of the pipe and the right angle side in a circle. This value is the verticality of the pipe flange to the pipe. 3.14 Pipe length deviation
3.14.1 Measuring tool:
3.14.2 Measuring method:
Use a ruler to measure the maximum length between the flanges at both ends of the pipe and compare it with the size specified in the drawing. The difference is the length deviation. Additional instructions:
HG/T2637-94
This standard was proposed by China National Chemical Equipment Corporation, Ministry of Chemical Industry. This standard is under the jurisdiction of the National Technical Committee for Standardization of Sugar Glass Equipment. This standard was drafted by the Chemical Machinery Research Institute of the Ministry of Chemical Industry. The main drafter of this standard is Liu Liangyue
People's Republic of China
Chemical Industry Standard
Method for testing geometric dimensions of glass parts
HG/T2637-94wwW.bzxz.Net
Editor China Chemical Equipment Corporation
Postal Code 100011
Printed by Beijing Institute of Chemical Technology Printing Factory
Copyright reserved
Format 880×1230
First edition in June 1995
No reproduction
Printing sheet 0.75
Number of words '12,000 words
First printing in June 1995
Price 4.70 yuan
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