JPS60220840A - Precise balancing method of rotating body - Google Patents

Abstract

PURPOSE:To attain balancing with high precision only by detecting the oscillation amplitude of a rotating shaft by centrifugal force by fitting two unbalance correcting weights at positions of specific angles alpha and beta. CONSTITUTION:In this invention, the oscillation amplitude a1 of the rotating shaft 3 depending upon an unbalance quantity when no unbalance correcting weight is fitted, the oscillation amplitude B of the rotating shaft due to the centrifugal force of the rotating shaft when one unbalance correcting weight is fitted, and the oscillation amplitude C of the rotating shaft due to the centrifugal force when the unbalance correcting weight is fitted at the opposite side are detected. Then, two unbalance correcting weights are fitted to positions of angles alpha and beta; alpha=pi+phi+cos<-1>[a1/2{(B<2>+C<2>-2a1<2>)/2} <1/2>] and beta=pi+phi-cos<-1> [a1/2{(B<2>+C<2>-2a1<2>)/2}<1/2>]. Then, the oscillation amplitudes of the rotating ing shaft are only detected to determine fitting positions of the unbalance correcting weights and attain balancing with high precision.

Description

DETAILED DESCRIPTION OF THE INVENTION In general, it is necessary to correct unbalance in a rotating body. For example, in the former case, unbalance of the grinding wheel of a grinding machine or the center axis of a vehicle has a negative effect on machining accuracy;
This is because in the latter case, the running performance, especially at high speeds, is adversely affected.

Conventional methods for balancing rotating bodies include removing the rotating body from the machine and balancing the gravity statically, and using an auto balancer. The rotating body has to be removed, which is time consuming and only rough balancing can be done.Also, the latter requires large size and high machine cost.For these reasons, precise balancing is not possible. It is desired to develop a balancing technology that can do this at low cost and that does not require stopping the machine.

The present invention was made in consideration of the above-mentioned circumstances, and in the unbalance correction work of a rotating body, the unbalance amount and rotation angle, which are the basic data for the correction work, are
Simple operation@'r- allows measurement to be carried out accurately and quickly without trial and error, which in turn makes correction work easy.
It is an object of the present invention to provide a precision balancing method for a rotating body that can be performed accurately and quickly.

In order to achieve this purpose, the precision balancing method for a rotating body of the present invention is configured such that two unbalance correction weights having the same mass can be attached to any position on a constant rotation radius of the rotating body, and a vibration meter for detecting vibrations of the rotating shaft of the rotating body, a: position B where vibration amplitude φ due to the unbalance amount of the rotating shaft in a state where the unbalance correction weight cannot be corrected: a+ occurs; : Vibration amplitude C of the rotating shaft due to the centrifugal force of the rotating body with one unbalance correction weight attached: C of the vibration of the rotating body with the unbalance correction weight moved and attached by π When the vibration amplitude of the rotating shaft due to centrifugal force is taken as, the two unbalance correction weights are at the following angles α and β, respectively, α; π + φ + (008” (al / 2 + a + 7 teeth) β
=π+φ−(cos'(a,/2r−t−a,).

Hereinafter, details of the present invention will be explained with reference to one drawing showing one embodiment.

FIGS. 1(A) and 1(B) are explanatory diagrams of the entire apparatus used to carry out the measurement method of the present invention, in which 1 is a rotating body, and here a grinding wheel for a grinding machine is shown as an example. There is. This rotating body is fixed to a rotating shaft 3 via a mounting flange 2. For this installation, the flange 2 is provided with an annular groove 4 having a constant radius r, and two unbalance correction weights 5.6 of equal mass are movable and removable in this groove 4. Equipment has been installed. For example, the signal emitted from the vibration it (non-contact displacement meter or acceleration pickup, etc.) 7 for detecting the vibration of the bearing part 13 of the rotating shaft is sent to the amplifier 8, which cuts off signals that do not match the rotational speed of the rotating shaft 3. AD converter etc. 1 through a filter 9 for
0 to the microcomputer 11 and the operator can perform the balancing work interactively via the display 12.

Using such a device, the amount of unbalance, i.e.
In order to measure the amount of unbalance as centrifugal force and its rotation angle, first remove the correction weight 5.6 from the groove 4, rotate the rotating body 1, and measure the voltage value a due to the centrifugal force of the rotating body 1. transfer the data to the microcontroller.

Next, use the correction weights 5 and 6 of the same mass as trial weights, set them at an arbitrary reference position (=I, rotate the rotating body 1, and set the voltage value B due to the centrifugal force of the rotating body 1 at that time. transfer to the microcontroller.

Furthermore, a trial weight attached to an arbitrary reference position,
It is attached to a copper plate 180 degrees opposite the reference position, rotates the rotating body 1, and transmits the voltage value C due to the centrifugal force of the rotating body 1 at that time to the microcomputer. After that, the microcontroller performs the following calculations.

Substituting the centrifugal force of the unbalance correction weight 5 or 6 alone as a, a = + - a, /2 ... (1) Equation 14 - and the unbalance position without the correction weight If the angle formed by
-a+))...For formula (2) in Figure 2 (B), φz= 006-'((a''-C'10ako)/(2
-a-a,))...With the information in equation (3) and above, two types of positional solutions come out for the correction weight attachment, so it is necessary to determine whether they are correct or incorrect. Therefore, a trial weight is attached at a position 90 degrees from the reference position, the rotating body is rotated, and the voltage value E due to the centrifugal force of the rotating body 1 at that time is transferred to the microcomputer. From Figure 3, compare el and el and E, which can be calculated in advance, and determine which of the two solutions is correct, and determine where the two correction weights should be attached. , will be displayed on the display.

The unbalance amount e when the supplementary weight is attached to the position 901i from the reference position and rotated is el = 8" +8+ + 2" a -8+ ・f in the case of Fig. 3 (A).
iinφ, ・(4) In the case of Figure 3 (B), e, = a'+a+2-a-a+-5inφ, ・(5)
It can be seen that the formula % formula % figure is more correct.

The unbalance position φ at this time can be determined from equation (2).

The amplitude a1 when there is no correction weight is proportional to the amount of centrifugal force unbalance, so if this amount of centrifugal force unbalance is F, then a, = C - F, ... (6) formula % formula %) Similarly Then, the centrifugal force unbalance of one correction weight! When la is the mass of the fog and ω is the angular velocity of the rotating body, then a=Q−・r・ω2 ... (7) formula% formula% (6) From formula (7), F1= (al /a) −m −r −ω” ・=
Equation (8) To correct this unbalance, attach the two unbalance correction weights 5.6 at the corners so that the resultant force is the same magnitude as FI and in the opposite direction. All you have to do is decide.

Since the centrifugal force of the correction weight 5.6 is m and "・♂, respectively, cosθ=al/2a from Fig. 4. Equation (9') % Formula % is the correction weight for the direction of unbalance. When two weights are distributed, it shows two weightless one-kakumaro.

Therefore, the unbalance correction weight to be attached is α-π+φ10O8-'(at/2a)-(10
) formula β-π+φ-cos” (a, / 2a > ・・
−(11).

The balancing work is completed by attaching the unbalance correction weight based on the angles α and β displayed on the display.

As is clear from the above explanation, in this invention, the vibration amplitude due to the unbalance amount of the rotating shaft without the unbalance correcting weight attached, and the centrifugation of the rotating body with one unbalance correcting weight attached. The installation position of the unbalance correction weight can be determined by simply detecting the vibration amplitude of the rotating shaft due to force and the vibration amplitude of the rotation shaft due to centrifugal force when the unbalance correction weight is installed on the opposite side. This makes it possible to easily perform accurate balancing without having to remove the rotating body from the machine.

[Brief explanation of the drawing]

Fig. 1 (A) is a front explanatory view showing the state in which the unbalance correction weight is attached to the rotating body, and Fig. 1 (B) is the illustration shown in Fig. 1 (
A> A side explanatory diagram of the rotating body, Figure 2 is a vector diagram showing the angle between the reference position and the unbalanced position without the unbalance correction weight, Figure 3 is the position 90 m from the reference position. φ calculated using equations (2) and (3) with weight added
A vector diagram showing the determination of the value of , and Figure 4 is a vector diagram showing the relationship with the correction weight vector when a vector is generated that is equal in magnitude and opposite in direction to the centrifugal force due to unbalance. It is. 1...Rotating body 2...Flange for mounting 3...
・Rotating axis 4... Weight fixing groove for unbalance correction 5.
6... Weight for unbalance correction Patent attorney Osamu Kawai Figure 1 (A) (B) Figure 2 (Al (B) ' υ 0 (A) (B)

Claims (1)

[Claims] 2 whose mass is equal to any position on a constant radius of rotation of a rotating body
It is configured so that it is possible to install several unbalance correction weights,
and a vibration meter for detecting vibrations of the rotation shaft of the rotating body, al: position B: where vibration amplitude φ due to the unbalance amount of the rotation shaft in a state where the unbalance correction weight is not attached: a1 occurs; Vibration amplitude C of the rotating shaft due to the centrifugal force of the rotating body when one balance correction weight is attached and left open: When the unbalance correction weight is moved by π and installed When the vibration amplitude of the rotating shaft is caused by the centrifugal force of the rotating body, the two unbalance correction weights are positioned at the following angles α and β, α;π+φ +(cos'(at/2 +C −2a+)/2)β=π
+φ −(cos′(a+/2 10G−2a1/2)).