JPS6037231Y2 - Mechanical structure consisting of multiple structures - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mechanical structure consisting of a plurality of structures.

What is shown in Japanese Utility Model Application Publication No. 51-15469 is a mechanical vibration damping structure previously submitted by the applicant of the present invention, and what is shown in this publication is the difference between a horizontal structure and a vertical structure. In a mechanical structure formed by fastening, an end plate is integrally provided at one of the ends of these joint parts, and a damping liner whose contact friction surface is formed with a smooth curved surface is attached to this end plate. By protruding into the cavity of the body and integrally providing it, and further providing a friction member that contacts the contact friction surface along the contact friction surface within the cavity of the other structure, bending that occurs at the joint part can be prevented. This had the effect of promoting the damping of mechanical vibrations.

However, in the conventional device, the upper member and the damping liner are integrated by welding.

When the damping liner and friction member are integrated into the structure by welding,
There is a disadvantage that welding distortion remains due to the welded connection, and since the surface pressure contact due to the contact friction surface is only at the bottom, the upper and lower joints are
The disadvantage was that the damping properties were inferior to those with friction surfaces.

In recent years, with the increase in the size of machine structures such as machine tools, vertical structures such as machine tool columns with long vertical lengths cannot be accommodated due to transport weight limitations, machining limits, etc. As shown in Figure 1, column 2 is further divided, and both columns 2,
In many cases, the respective structures are integrally connected by fastening each other with bolts and nuts, using the contact surfaces of the lower column 2 and the lower column and the bed 3 as the structural surfaces 11.

In this case, the rigidity is lower than that of a one-piece structure, and the occurrence of vibration modes such as bending at the joint becomes noticeable (Figure 2).
Or, if you try to maintain the same rigidity as one piece, the flange part will be very large.

Furthermore, when integrating the damping liner and friction member into the structure, welding may leave weld distortion, which is undesirable, and machining it as a single piece would result in high costs due to the complicated shape. There were drawbacks.

The present invention was proposed in order to eliminate the above-mentioned conventional drawbacks, and the opposing structural surfaces of the structure are each formed as a concave contact friction surface with a smooth surface and a predetermined curvature. It is an object of the present invention to provide a mechanical structure consisting of a plurality of structures, characterized in that each structure is fastened to each other by sandwiching a highly rigid damping liner having a convex surface along the plane. be.

The present invention will be explained below with reference to the embodiments shown in the drawings. First, in FIGS. 3 and 4, a column (column strafe) 2 which is a vertical structure and a bed (bed strafe) 3 which is a horizontal structure. A column end plate 6 is formed integrally with the column 2 and provided with a column flange 2' having bolt passage holes 2'' drilled therearound.

The column end plate 6 is provided with a hole provided with a spherical seat 6' corresponding to the shape of the damping liner 8 so that about half of the hollow spherical damping liner 8 protrudes into the cavity on the bed 3 side. be.

On the other hand, at the end of the joint of the bed 3 with the column 2, a bed flange 3' is provided, which is integrated with the bed 3 and has a bolt passage hole 3'' drilled around it that corresponds to the bolt passage hole 2'' on the column 2 side. An end plate 7 is formed.

A hole with a spherical seat 7' corresponding to the shape of the damping liner 8 is also bored in the bed end plate 7 so that about half of the hollow, spherical damping liner 8 protrudes into the cavity on the column 2 side. be.

Also, when the column 2 and bed 3 are fastened together using the bolts 4 and nuts 5 attached to the column flange 2' and bed flange 3', the shape of the damping liner 8 formed in the column end plate 6 and bed end plate 7 corresponds to the shape of the damping liner 8. Spherical seat 6'? A column is provided with a damping liner 8 such that it contacts the hole with the hole and a part of the outer surface of the damping liner 8 at a suitable surface of about 2 kg per square millimeter to effectively promote damping of mechanical vibration. 2 and the bed 3.

Note that the damping liner 8 may be made solid to increase the natural frequency of the machine body, or may be press-fitted or sealed with fluid such as oil, or solid particles such as sand or iron balls, to increase the damping effect. It's okay.

Alternatively, as shown in FIG. 5, it is also possible to drill holes 9, 9' that communicate the column 2 and bed 3, and to incorporate mechanical elements such as gears into the damping liner 8. .

According to the above structure, when a vibration mode such as bending occurs at the joint between the column 2 and the bed 3, the contact friction surface 10 between the column end plate 6, the bed end plate 7, and the damping liner 8 is This becomes the structural surface of the bed 3, and this structural surface generates sliding friction to cause frictional damping of vibrations, thereby promoting damping of generated vibrations.

In FIG. 7, instead of providing the end plates 6 and 7, a spherical seat 10 corresponding to the shape of the damping liner 8 is installed at a part of the end of the joint of the column 2, which is the joint between the vertical structures. This is an example in which the spherical seat is provided as a structural surface, and another example in which the damping liner 8 is sandwiched between the joint portion of the column 2 so as to be in contact with a part of the outer surface of the damping liner 8 with an appropriate surface pressure. It shows.

In this case, the column end plate 6 is unnecessary and the structure is simple, but the advantage is that the damping effect is the same.

Furthermore, as shown in Fig. 3, when a spherical damping liner 8 is used, it has a substantially uniform vibration damping effect in all directions on the horizontal plane, but the contact friction surface is a concave surface along a cylinder or spheroid. The waist is formed with a smooth surface (no unevenness)
By using a damping liner that follows such a friction surface with a predetermined curvature, it is possible to exert a particularly strong damping effect on vibration modes in a specific direction (in Fig. 6, the left-right direction in the drawing). be.

Furthermore, in each of the above specific examples, it is possible that a polymer material such as rubber or plastic is sandwiched between the respective structural surfaces of the column and the damping liner, and the material damping of these polymer materials is also used. do.

The present invention is constructed as described in detail above, and since the contact friction surfaces are on opposing structural surfaces of each structure, damping performance can be expected to be more than twice that of the conventional case where only one is used.

Furthermore, there is no drawback that welding distortion remains, which is the case with conventional damping liners that are welded to structures.

Therefore, by adopting the structure of the present invention for machine tools, etc. that have a structure that generates a vibration mode such as bending at the joint between both structures, the dynamic stiffness can be greatly improved by increasing the friction damping capacity. For example, the logarithmic decay rate is 0.0.
2 can be increased to 0.2 or more, increasing machining accuracy and chatter stability limit.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing an example of a mechanical structure constructed by connecting a horizontal structure and a vertical structure that have been proposed in the past. FIG. 3 is a front sectional view showing a joint of a mechanical structure in an embodiment of the present invention, FIG. 4 is a sectional view taken along line A-A in FIG. 3, and FIG. 6 is a front sectional view of a mechanical structure different from that in FIG. 3; FIG. 6 is a sectional view taken from B to B in FIG. 5; FIG. It is a CC sectional view of the figure. Explanation of the main parts of the diagram, 2... Column (vertical structure), 3... Bed (horizontal structure), 2', curved column flange, 4... ...Bolt, 5...
... Nut, 8... Damping liner.

Claims (1)

[Scope of utility model registration request] The opposed structural surfaces of each structure are each formed as a smooth concave contact friction surface with a predetermined curvature, and each structure is sandwiched between damping liners having a convex surface along the friction surface. A mechanical structure consisting of a plurality of structures whose bodies are connected to each other.