What test should be performed on abrasive wheels quizlet?

What test should be performed on abrasive wheels?

What test should be performed on abrasive wheels quizlet? There are many types of abrasive wheels products. This article lists the following test item standards and testing methods based on the inspection before the product is put into storage and the quality inspection before use.

What test should be performed on abrasive wheels quizlet

First, the quality test of the finished abrasive wheels quizlet should be performed

The quality technical standards of abrasive tools are the main basis for product quality inspection.The inspection items of ordinary grinding wheels include the following seven items: basic dimensions, row tolerances, appearance defects, hardness, static balance, rotation strength, and organization number.

Among them, hardness, static balance, slewing strength, and organization number are four items that directly determine the intrinsic properties of the abrasive wheels, such as safety and serviceability. Therefore, these items are often referred to as the internal quality inspection of the abrasive wheels. The organization number is not checked under normal circumstances, but when the user raises an objection, it shall be determined according to national standards.

1. Outer diameter limit deviation:

Unit: mm

Outside diameter D limit deviation
General grinding wheel Cylindrical grinding wheel
≤6 ±0.5 —-
>6~30 ±1 —-
>30~120 ±1.5 —-
>120~400 ±2.5 +1

-4

>400~1000 ±4 +1

-5

>1000~2000 ±6 —-

2.Thickness limit deviation:

Unit: mm

Thickness T General grinding wheel Thickness T Grinding bearing grinding wheel and grinding wheel grinding wheel
≤16 ±0.5 ≤16 +0.5

0

>16~120 ±1.5 >16~40  

+1.0

-0.5

>120~400 ±2.5
>400~1000 ±4 >40~250 +1.5

-0.5

3. Aperture limit deviation:

Unit: mm

Aperture H limit deviation
A B C
≤30 +0.16

0

+0.21

0

>30~50 +0.25

0

>50~80 +0.19

0

+0.30

0

>80~180 +0.25

0

+0.40

0

>180~250 +0.29

0

+0.46

0

+0.57

+0.28

>250~315 +0.32

0

+0.52

0

+0.65

+0.33

>315~400 +0.36

0

+0.57

0

>400~500 +0.40

0

+0.63

0

Note:

1. A is suitable for grinding wheels installed on a grinding machine for grinding;

2.B is suitable for the grinding wheel installed on the grinding machine for grinding and cutting;

3, C is suitable for heavy-duty steel billet grinding wheels.

4. The limit deviation of grinding wheel groove diameter P, groove depth F, G, bottom thickness E, ring end surface width W, and circumferential surface thickness U:

Unit: mm

Groove diameter P limit deviation
≤120 +3

0

>120~400 +5

0

>400 +7

0

Unit: mm

Groove depth F or G limit deviation
A B
≤16 ±0.5 ±1
>16~40 ±2
>40 ±3

Note:

1. A is suitable for double-sided concave No. 2 grinding wheel (grinding gauge grinding wheel);

2. B is suitable for other grinding wheels.

Unit: mm

Base thickness E, ring width W, circumferential surface thickness U limit deviation
W E U
a b c d e
≤16 +1.0

-1.5

±1.0 +1.0

-0.5

+1.0

-0.5

+0.5

0

>16 ±2 +1.5

-0.5

Note:

1.a is suitable for cup, bowl, dish and double-sided concave No. 2 grinding wheel (grinding gauge grinding wheel);

2.b is suitable for cylindrical grinding wheels;

3, c is suitable for cups, bowls and saucers;

4, d is suitable for single bevel, double bevel and dish-shaped wheels;

5. e is suitable for single-sided convex grinding wheels.

5. Tolerance of end face circle and radial circle runout of cup, bowl and dish-shaped grinding wheel for tool grinding:

Unit: mm

Foreign Economy D Round runout tolerance
End face Radial
>30~100 0.2 0.3
>100~300 0.3 0.4
>300~500 0.5 0.6

6. Parallelism tolerance and coaxiality tolerance of both ends of the grinding wheel:

Unit: mm

Outside diameter D Parallelism tolerance on both ends Coaxiality tolerance
A B A B
≤30 0.2 0.3 0.3 0.3
>30~100 0.4 0.4
>100~300 0.4 0.5
>300~1000 0.5 0.5
>1000~2000 0.3 0.5 0.5 0.5

Note:

1. A is suitable for centerless grinding, profile grinding, grinding tooth surface, grinding thread, grinding groove, grinding crankshaft, grinding bearing channel and grinding wheel with maximum linear speed greater than 50m / s;

2. B is suitable for general grinding wheels.

7. Flatness and roundness:

Unit: mm

Flatness Roundness
≤0.5 ≤0.3

8. Cylindricity:

Unit: mm

Thickness T Cylindricity
≤50 ≤0.3
>50~100 ≤0.5
>100~250 ≤0.8
>250 ≤1.0

9. Appearance inspection test of the abrasive wheels quizlet should be performed:

It should be uniform in color, without cracks, black hearts, and dumb sounds.

10. Static balance test:

Grinding wheels with an outer diameter D≥125mm and a working linear velocity V≥16m / s should be subjected to a static balance test. The cylindrical, cup, and bowl-shaped wheels, and the centerless grinding wheel are not subjected to a static balance test.

11. Rotation inspection:

Grinding wheels with an outer diameter D≥150mm; and a working linear velocity V≥50m / s and an outer diameter D≥100mm shall be subject to rotation inspection. Cylindrical grinding wheels, pin grinding wheels and centerless grinding guide wheels are not subject to rotation inspection.

Second,deviation and measurement method of basic dimensions of grinding wheel

The measurement of the basic size of the grinding wheel should be based on the accuracy requirements of the allowable limit deviation specified by different grinding wheels and different sizes, and inspection tools with different accuracy should be selected. The general inspection tools used in grinding wheel size inspection are steel rulers, vernier calipers, etc. Dedicated inspections have plug gauges, card gauges, samples, etc. For special-shaped products, there are often special templates to check their external dimensions.

1.Grinding wheel outer diameter measurement and size effect

When the requirements are not high, the steel ruler and tape measure are used. If the measurement is at the maximum limit and the minimum limit, the vernier caliper can be used with the steel ruler to measure. The size of the outer diameter generally has little effect on the use, but it is a key dimension for special products. For example, the size of the grinding wheel with a machine tool cover cannot be installed, and the small size can easily affect the number of processed parts. The inconsistent size will cause great inconvenience to trim.

2.Measurement of wheel thickness and size

Generally use a steel ruler to measure. If the measurement is at the maximum and minimum limits, you can use a vernier caliper with a steel ruler. As the bearing industry has stricter requirements on thickness, vernier calipers or micrometers are used for measuring wheel thickness and oil stone width. The effect of thickness size is generally not large, but for forming grinding, the thickness requirements are quite strict.

3.Abrasive wheels aperture measurement

Grinding wheel aperture size accuracy requirements are more stringent. When measuring, a more precise special measuring tool-limit gauge is used. The through end and end of the limit gauge are used to control the upper and lower deviations of the aperture. The effect of the hole is quite large, and it is too small to install; if it is too large, it is difficult to align the center during installation, and it is easy to cause eccentricity and unbalance of the grinding wheel. Under high-speed rotation, the radial runout will be intensified and the grinding wheel will break.

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