RU2418198C1 - Procedure for assembled rotor balancing - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: here is disclosed procedure for assembled rotor balancing. The procedure consists in balancing a shaft and successively, upon mounting the next preliminary balanced element, there is balanced an assembled rotor. The point of maximal radial run-out of mounting surface relative to balancing surfaces is determined and marked on the mounted element at each preliminary balancing. Before element mounting on the shaft there is determined and marked point of maximal radial run-out of each mounting surface of the shaft relative to its balancing surfaces. The elements of the rotor are set in the shaft matching the marked points.

EFFECT: minimal disbalance of rotor caused with eccentricity at installation of its element, raised accuracy of balancing and reduced cost of operations.

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Description

The invention relates to mechanical engineering and can be used in the assembly and balancing of prefabricated rotors of compressors of gas pumping units (GPU).

A known method of balancing prefabricated rotors is described in clause 6.3.1 of GOST ISO 11342-95, in which each of the elements, including the shaft, must be balanced before assembly by balancing the rigid rotor, with the eccentricity of the shaft seating surfaces and other assembly dimensions that determine the position of the elements relative to the shaft, tight tolerances must be specified. Similar requirements apply to the balancing mandrel. It is proposed to eliminate balancing errors, including due to the eccentricity of the seating surfaces of the balancing mandrel, by element-wise balancing. It is also recommended that the calculation evaluate the effect of the assembly error and the eccentricity of the installed parts on the achievable initial imbalance.

This method is taken as a prototype.

The disadvantage of this method is that when installing each element of the rotor on the shaft does not take into account the relative position of the eccentricity of the seating surface of this element on the shaft and the eccentricity of the same element on the balancing mandrel, which leads to the summation of the imbalance vectors for the rotor as a whole.

The magnitude of the imbalance of the rotor caused by the eccentricity of the installation of its element can reach values exceeding the permissible level of imbalance by orders of magnitude.

So, for example, a rotor element weighing 150 kg after balancing has an imbalance not exceeding 150 g · mm, which corresponds to an eccentricity of its mass of 1 μm. In this case, the eccentricity error of the landing surfaces of the balancing mandrel and the rotor shaft can reach 10 μm each. When an element is mounted on a rotor with a diametrically opposite turn of the eccentricity of the seating surface on the shaft and a place on the rotor element corresponding to the position of the eccentricity of the seating surface of the mandrel during preliminary balancing, the imbalances caused by the eccentricities of mounting the element on the mandrel and rotor shaft are added up, i.e. the total eccentricity can reach 20 μm, and the total imbalance is 3000 g · mm.

The technical task of the present invention is to minimize the imbalance of the rotor due to the eccentricity of the installation of its element, improving the accuracy of balancing and reducing the cost of work.

The technical result is achieved by balancing the shaft and sequentially, after installing another pre-balanced element on the shaft, balancing the assembled rotor. During preliminary balancing of each installed element, the place of maximum radial runout of its seating surface relative to the balancing surfaces is determined and marked on the element. Before installing the elements on the shaft, determine and mark the place of maximum radial runout of each shaft seating surface relative to its balancing surfaces. Install the rotor elements on the shaft, combining marked areas.

The method is illustrated by the drawings shown in figures 1, 2, 3,4.

Figure 1 explains the determination of the maximum runout of the landing surface on the mandrel.

Figure 2 explains the marking of the maximum runout of the landing surface of the mandrel on the surface of the element.

Figure 3 explains the determination of the maximum runout of the landing surface on the shaft.

Figure 4 explains the marking of the maximum runout of the seating surface on the shaft and the installation of the element on the seating surface of the shaft.

In the figures indicated:

1 - balancing mandrel;

2 - rotor element;

3 - rotor shaft;

4 - measuring prisms;

5 - measuring device;

A, B - balancing surfaces of the mandrel;

B, G - balancing surfaces of the shaft;

P, P - landing surfaces for the rotor element on the mandrel and shaft.

The method is as follows.

On the balancing mandrel 1 (Fig. 1) with the element 2 installed on it on the measuring prisms 4, using the measuring device 5, determine the place of maximum radial runout _Δ D _{max by the} seating surfaces P relative to the balancing surfaces A, B. Mark the place of the maximum radial runout of the surface P of the balancing mandrels on the side surface of the rotor element, Fig.2.

Balance the item. Install the shaft 3 on the prisms (Fig. 3) and determine the place of maximum radial runout by the seating surfaces P relative to the balancing surfaces B, D. The element is removed from the mandrel and mounted on the rotor shaft, aligning the marked places, Fig. 4. Balance the rotor.

Thus, the application of the proposed method minimizes the imbalance of the rotor due to the eccentricity of the installation of its element, improving the accuracy of balancing and reducing the cost of work.

Claims (1)

A balancing method for the assembled rotor, in which the shaft is balanced and, successively after installation of the next pre-balanced element on the shaft, the assembled rotor is balanced, characterized in that during the preliminary balancing of each installed element, the maximum radial runout of its seating surface relative to the balancing surfaces is determined and marked on the element, before installing elements on the shaft determine and mark the place of maximum radial runout of each planting the surface of the shaft relative to its balancing surfaces, install the elements of the rotor on the shaft, combining marked areas.

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