This standard specifies the maximum allowable balance of various types of delivered grinding wheels with an outer diameter equal to or greater than 125mm and a maximum operating speed equal to or greater than 16m/s in GB/T 4127-1997. It also specifies the measurement and acceptance methods of the unbalance of grinding wheels. This standard is applicable to ordinary abrasive grinding wheels in delivery conditions. GB/T 2492-2003 Measurement of allowable unbalance of ordinary abrasive delivered grinding wheels GB/T2492-2003 Standard download decompression password: www.bzxz.net

GB/T 2492—2003
This standard is modified to adopt IS06103:1999 (English version) for the measurement of the unbalance allowed for the delivery of grinding wheels for ordinary abrasives. This standard is redrafted based on IS06103, 1999. The main differences from 1S06103:1999 are as follows: In the first chapter, except for 1S0603-1 to ISO603-9 and ISO603-12 to IS603-16, the corresponding Chinese standard GB/T4127 is added.
Except that "This international standard does not apply to - diamond grinding wheels and cubic nitrided grinding wheels or natural stone grinding wheels, - centerless grinding guide wheels, polishing grinding wheels and grinding discs, grinding steel ball grinding wheels and grinding glass grinding wheels". In light of national conditions, it is revised as follows: "This standard does not apply to grinding wheels where balance inspection is otherwise specified in the product standards.
·In Chapter 2, in addition to the cited international standards, G13/T4127 is added to the normative references to suit my country's national conditions.
- In Chapter 5, "Inspection of inherent unbalance", the statement "balance shaft and support (guide rod and disc) should have appropriate hardness and surface roughness to reduce friction" is deleted. The requirement "the hardness of the balance shaft should not be less than 50HRC, the maximum allowable surface roughness is 0.4μm, the hardness of the support (guide rod and disc) should not be less than 50HRC, and the maximum allowable surface roughness is 0.2μm" is added.
In Table 1 of Chapter 6, the type 2 grinding wheel for portable grinder is deleted, which is not suitable for portable grinders. - For the convenience of use, the following editorial changes have been made to this standard: a) "this international standard" is changed to "this standard", b) the international standard preamble is deleted.
This standard replaces GB/12492—1984 "Test method for static balance of grinding wheels and value of unbalance". This standard was proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Abrasives and Grinding Tools (SAC/TC139). This standard was drafted by the Zhengzhou Abrasives and Grinding Research Institute. The main drafters of this standard are Chen Wenping, Li Xiaoming, Yang Songcan and Zhang Changwu. This standard was first issued in 1981 and revised for the first time in 1984. I
1 Specification
Measurement of the allowable unbalance value of delivered grinding wheels for ordinary grinding wheels
GB/T2492—2003
This standard specifies the allowable maximum unbalance value of delivered grinding wheels of various models in GB/T4127:—1997 with an outer diameter equal to or greater than 125 mm and a maximum working speed equal to or greater than 16 m/s. At the same time, the test method and acceptance method of the unbalance of the grinding wheel are also specified. This standard is applicable to the grinding wheels with special requirements for balance inspection in the product standards. Note 1: The given effective value is inherent in the grinding wheel itself, but includes the balance value of the balance shaft or the wheel mounted on this shaft. Various similar devices, including chucks or long tables, etc., are required to be balanced, uniform, and free of geometric defects. Note 2: The main effects of unbalance are: - Wear of the spindle, machine tool and fixture production
The vibration generated affects the processing quality and increases the stress inside the wheel; - Increase the operating wear.
2 Normative referenced documents
The clauses in the following documents become the clauses of this standard through reference in this standard. All subsequent revisions (excluding errors) of dated references are not applicable to this standard. However, parties to agreements based on this standard are encouraged to investigate whether the latest versions of these documents can be used. For undated references, the latest versions apply to this standard. GB/T 4127-1997 Shapes and dimensions of ordinary abrasive tools 3 Terms and definitions
This standard uses the following terms and definitions.
Unbalance
The radius of a grinding wheel is expressed in units of radius, the mass is expressed in grams, and the unbalance is expressed in grams and millimeters. 3.2
A grinding wheel has an unbalance U, which is the product of the mass m of the grinding wheel and the distance e from the center of gravity (center of gravity) of the grinding wheel to the center of its spindle 0 (see Figure 1). 1
GB/T2492—2003
U =,
measured unbalance value.
measured unbalance U.
The product of the mass m of the mass block added to the outer periphery of the grinding wheel to balance it and the distance between the mass center () of the mass block and the center O of the grinding wheel, that is, m2r. (See Figure 2).
, in fact, the distance between the center of mass G and the center of the grinding wheel is equal to the radius of the grinding wheel. U=mnbzxZ.net
In the figure:
1-mass block with mass m.
4Allowable unbalance value.
According to experiments, the maximum unbalance allowable value U can be determined by a mass m,=U. /r, 2
Where:
The radius of the grinding wheel, in millimeters.
m, k /mi
m,—The mass of the mass whose center is located on the circumference of the grinding wheel, in grams. ---The mass of the grinding wheel, in grams:
CB/T2492-2003
-" coefficient, the coefficient value is determined by the type and purpose of the grinding wheel. The maximum value is given in Table 1. The value of is selected based on the function of the test and the value of is shown in Figure 5. The value of is selected based on the experiment, so the obtained unbalance value is applicable to the inherent unbalance of the grinding wheel for general use.
Put the balance shaft through the center hole of the test wheel so that the center of the grinding wheel is in the vertical position outside the plane. For flat grinding wheels and similar wheels, it can be placed in a free state. For other shapes of grinding wheels, appropriate chucks can be used for support. Put the balance shaft on two parallel horizontal double-bevel guide rods or on a circle column rod (see Figure 3), or on a balance frame. The balance frame has two pairs of overlapping and freely rotatable round steel discs (see Figure 4), so that the grinding wheel can reach a balanced position under the action of the minimum friction.
Platform The gap between the balance shaft and the grinding wheel hole shall not exceed 0.4mm. The hardness of the balance shaft shall not be less than 50HRC, and the maximum allowable value of the surface roughness is Ra0.4μm; the hardness of the support (guide rod and disc) shall not be less than 50HRC. The maximum allowable value of the surface roughness is Ra0.2μm. When the grinding wheel reaches the balance position, its center of mass is at the lowest point. In this state, make a mark at the highest point of the grinding wheel circumference. Turn the grinding wheel 90 degrees so that the mark point is located in the horizontal plane of the axis of the balance shaft. When the mass block is placed at the circumferential mark point, the grinding wheel can still maintain balance, and the mass m is determined. In this way, the imbalance U can be obtained, which is equal to m·r. U. is equal to the inherent imbalance of the grinding wheel and has the opposite force direction. In the following formula, the mass of the mass block is used to determine the imbalance of the grinding wheel circumference. U;=U=m2.r
Alternative solution: The two pin guides can be replaced by two cylindrical guide rails. Figure 3
GJ/T 2492—2003
6 Check the inherent unbalance
Check the inherent unbalance according to the method specified in Chapter 5. Figure 4
A grinding wheel is only confirmed as a qualified product when its inherent unbalance is less than or equal to the allowable unbalance. That is, the mass of the mass block used for USU
The mass of the mass block used for inspection is: m. -U./r. 6. 1 m. Determination
From Table 1, the values ​​of the coefficient table can be found. The values ​​are related to the various parameters of the grinding wheel and its use. Figure 5 shows the mass value m of the mass block in grams, which is a function of the grinding wheel mass m1 and the coefficient. 1000
2030406080100
200300500100010g
Grinding wheel mass m, in grams
GB/T 2492—2003
For example: a flat grinding wheel for fine grinding, outer diameter D=762mm, mass m,=68000g, maximum working speed -60m/5, coefficient k=0.32 (see Table 1), then the maximum allowable mass value is 7n,-83g. Table 1 Coefficient k value
Outer diameter D/mmThickness 1/mm
Grinding method
Coarse (deburring,
repairing, etc.)|| tt||Heavy-duty grinding
-Precision grinding
"Cylindrical grinding
-Surface grinding
-Tool grinding
Portable grinding machine
National grinding machine
Suspended grinding machine
Other grinding machines
Fixed grinding machine
Fixed grinding machine
Portable cutting machine
Fixed cutting machine
6. 2 Acceptance inspection of grinding wheel
Grinding wheel model
1,4,27,28,Type 35,36
Type 6,11
Type 1,2,35.36
All types
All sizes
All sizes
All sizes
All sizes
Maximum operating speed/(m/s)
161040s.63/63s10n
Install the grinding wheel on the test stand according to the method specified in Chapter 5 and place the mass n obtained in 6.1 at the marked point on the circumference of the grinding wheel. If the grinding wheel remains stationary or the grinding wheel rotates and the marked point is at the bottom, it indicates that the grinding wheel is qualified. Otherwise, the grinding wheel is rejected.
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