JPH0719288A - Weight balance adjusting method for rotary body - Google Patents

Abstract

PURPOSE:To perform simple and easy adjustment of the weight balance of a rotary body to be adjusted from an unbalance measurement result. CONSTITUTION:A plurality of hole parts 11 are formed at equal intervals in the direction of the axis of a concentric circle in a rotary body 10 to be adjusted to adjust a weight balance. By using a weight balance measuring device, the rotary body 10 to be adjusted is rotated. An unbalance weight is calculated at intervals of a given phase and a given steel ball 12 having weight equivalent to a calculated unbalance weight is securely charged in the given hole part 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the weight balance of a rotating body, and more particularly to a method for adjusting the weight balance by which the adjustment work can be performed easily and easily.

[0002]

2. Description of the Related Art Adjusting the weight balance of a rotating body that rotates at a high speed, such as a tool holder of a machine tool, becomes more important as the speed increases, and it is desired to improve its accuracy.

As a highly accurate weight balance adjusting method,
For example, a method is known in which the amount of unbalance of the rotating body to be adjusted is calculated as an unbalanced vector, and the size of the counterweight and the fixed position of the weight are determined by this vector calculation (Japanese Patent Laid-Open No. 2-186231). .

There is also known a method in which a weight for adjusting the imbalance is formed by a screw member, and the weight is screwed into a screw hole provided in the rotating body to be adjusted, and the weight is adjusted (actual opening 4-63316). Issue).

[0005]

In the above-described conventional weight balance adjusting method, since the display of the unbalance amount is directly indicated by the weight, the weight (weight) used for the unbalance adjustment can be selected and processed. It is troublesome, requires a skilled worker, and has poor workability.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a weight balance adjusting method capable of easily and easily adjusting the weight balance of a rotating body to be adjusted from the result of unbalance measurement. To aim.

[0007]

In order to achieve the above object, the present invention measures a weight balance by forming a plurality of holes at equal pitches in a concentric axis direction on a rotating body to be adjusted for weight balance adjustment. By rotating the adjusted rotating body using the device, calculating the unbalanced weight for each predetermined phase, and inserting and fixing a predetermined weight corresponding to the calculated unbalanced weight into a predetermined hole, The feature is that the weight balance of the adjusting rotating body is adjusted.

[0008]

According to the present invention, an unbalanced weight is measured by using a weight balance measuring device, a predetermined weight corresponding to the unbalanced weight is placed in a predetermined hole portion, and the unbalanced weight is fixed. Adjustments are made.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view showing an example of a weight balance adjusting method according to the present invention. In the figure, reference numeral 10
Is a rotating body to be adjusted (a tool holder of a machine tool in this embodiment) whose weight balance is adjusted. Plural screw holes 11 are formed in the flange surface 10a of the tool holder 10 at equal pitches in the circumferential direction. Reference numeral 20 is a weight balance measuring device for measuring the weight balance, and this device 20 is provided with a rotary spindle 21 which holds the rotating body to be adjusted and rotates the rotating body at a high speed.

First, the tool holder 10 to be balanced.
Is attached to the rotary spindle 21 of the weight balance measuring device 20 without attaching any weight, and the rotary spindle 21 is rotated at a high speed to measure the weight imbalance of the tool holder 10 and its position (phase). The magnitude and phase of this imbalance can be obtained by calculating a vector as shown in FIG.

The vector diagram shown in FIG. 3 is drawn on the premise that the unbalance moment and the vibration amplitude are proportional to each other.
Vector B (unbalance moment of the tool holder 10). In addition, the tool holder 10 and the rotary spindle 2
The unbalance moment A of the rotary spindle 21 due to the misalignment of both tapered surfaces of No. 1 is undetermined, and the vector A needs to be obtained before the vector B is obtained.

First, the tool holder 1 without attaching the weight.
0 is rotated at a predetermined number of rotations, and the total unbalance moment C of the tool holder 10 and the rotary spindle 21 without additional weight is obtained. Next, a weight whose weight is known is put into the screw hole 11 and rotated again, and the unbalance moment D when the weight is added is obtained.

The vector E is obtained by the vector calculation C-D. This vector E indicates the change in the unbalance moment caused by adding the weight.
From this E, the correlation between the added weight and the vibration amplitude (how much added weight corresponds to how much the vibration amplitude) and the relationship between the weight addition position and the unbalance moment can be obtained.

Next, the tool holder 10 is once pulled out from the rotary spindle 21 and the weight is taken out, and the tool holder 10 is inverted 180 ° and mounted again on the rotary spindle 21. In this way, after the mounting engagement relationship between the tool holder 10 and the rotary spindle 21 is reversed by 180 °, the rotary spindle 21 is rotated again to obtain the unbalance moment G. This unbalance moment G is calculated by the tool holder 1
It shows an unbalance moment generated by inverting 0 by 180 ° and corresponds to the vector C.

According to FIG. 3, there is a relation of G = F + A and C = B + A, but the unbalance moment F of the tool holder 10 measured by reversing 180 ° has a relation of B = −F, so G + C = The relational expression F + A + B + A = 2A holds.

Therefore, the unbalance moment A of the rotary spindle 21 is obtained by A = (G + C) / 2.

Next, the unbalance moment B of the tool holder 10 is obtained by B = CA.

From the vector B, the magnitude and position of the weight imbalance of the tool holder 10 is determined in consideration of the correlation between the added weight and the vibration amplitude obtained by the vector E and the influence of the added position of the weight.

Since the unbalance moment of the tool holder changes due to deformation due to centrifugal force and the like, it needs to be calculated for each required number of rotations.

Next, based on the measured size and position of the weight balance, the size of the weight necessary for adjusting the weight balance and its additional position (phase) are obtained.

The required size of the weight is displayed by a combination of several types of steel balls whose weights are already known and the number of used steel balls.

For example, the following steel balls are prepared as weights for adjusting unbalance.

Weight by type A 1050mgr B 443mgr C 132mgr D 16.4mgr E 2.1mgr For example, when the weight required for adjustment is calculated to be 0.645gr, the weight is selected as follows. Is displayed as a combination of the required number.

[0025] Therefore, the operator selects the required number of each steel ball according to the above display and inserts it into the designated screw hole 11.

As shown in FIG. 2, the thrown-in steel ball 12 is fixed in the screw hole 11 by screwing a screw member 13 into the screw hole 11 for sealing.

As described above, according to the present embodiment, the weight necessary for adjusting the weight imbalance is the steel ball 1 to be used.
Since it is displayed as a combination of the two types and the number used,
The operator can quickly and easily select the weight and perform the mounting work.

In this embodiment, the example in which the steel balls are used as the weight is shown, but the weight is not limited to the steel balls, and any shape may be used as long as the weight is already determined. May be.

[0029]

As described above, according to the present invention,
After the weight size and its addition position required for weight balance adjustment are calculated, the weight balance can be adjusted simply by inserting and fixing a predetermined weight corresponding to this into a predetermined hole. It can be done easily and quickly.

The present invention is not limited to the weight balance adjustment of the tool holder of the machine tool, but can be used as a general weight balance adjustment method for a rotating body rotating at high speed.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view showing a state in which a steel ball is inserted and fixed in a screw hole.

FIG. 3 is a vector operation diagram for obtaining the magnitude and position of imbalance.

[Explanation of symbols]

 10 Tool Holder 10a Flange 11 Screw Hole 20 Weight Balance Measuring Device 21 Rotating Spindle

Claims (3)

[Claims] 1. A plurality of holes are bored at equal pitches in a concentric axis direction in a rotary body to be adjusted for weight balance adjustment, and the rotary body to be adjusted is rotated using a weight balance measuring device.
A method for adjusting the weight balance of an adjusted rotary body by calculating an unbalanced weight for each predetermined phase and inserting and fixing a predetermined weight corresponding to the calculated unbalanced weight into a predetermined hole. 2. The weight balance adjusting method according to claim 1, wherein the weight to be charged and fixed is calculated as a combination of the type of use and the number of pieces used. 3. The weight balance adjusting method according to claim 2, wherein the weight is a combination of steel balls having various weights.