JPH0238334B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a concrete structure for machine tools such as milling machines and machining centers.

(Prior Art) Concrete structures are being adopted for beds, columns, etc. for the purpose of improving the vibration damping properties of machine tools. However, it is difficult to replace parts such as guide surfaces that require high precision and high rigidity with concrete, so the following structural method is adopted.

(1) The guide member made of cast iron or steel and the main body made of concrete are manufactured separately and joined together with adhesive.

(2) The entire structure, including the guideway, is made of concrete, and the precision of the guideway is achieved by pasting and applying resin.

(3) Pour concrete directly onto the back of the guide member and form it integrally as the concrete hardens.

As for the third method, the inventors of the present invention etched ribs on the back side of the guide member in the bag in Japanese Patent Application No. 60-32810 to improve the adhesion to the concrete, and to further strengthen this adhesion. proposed a method in which anchor bolts are anchored to the guide member, and the guide member is further tied together with bolts to a tie plate provided on the bottom of the concrete section.

(Problems to be Solved by the Invention) In the first method, shrinkage, deformation, and distortion occur as the adhesive hardens, and manufacturing is not easy.

Furthermore, the second method has limitations on the shape of the guide surface, and cannot be used in applications subject to tension or high loads.

Furthermore, in the third method, when the ratio of the guide surface to the concrete part increases, cast iron members with poor damping properties are buried in the same concrete part, so even though the damping effect by the joint surface of concrete and cast iron is high, Regardless, the damping performance will deteriorate. Furthermore, when the tightening plate is used as a leg member of a bed, external disturbances are likely to be transmitted to the guide member through the bolt.

(Means for Solving the Problems) The present invention was proposed to solve these problems, and includes a plurality of horizontal ribs on the back surface of the plate of a guide member made of metal or fine ceramics. vertical ribs are planted, an anchor material that vertically penetrates the small chambers defined by each rib is attached to the back of the plate, each of the small chambers is filled with ferrite-containing resin, and the small chambers are filled with ferrite-containing resin. This invention relates to a concrete structure for a machine tool, characterized in that cement-based concrete is cast on the back surface of the machine tool, and the tip of the anchor material is fixed in the cast concrete.

(Function) Since the present invention is configured as described above,
The compressive force applied to the guide member is transmitted to the concrete part on the back side of the plate via the vertical ribs and the horizontal rib at the tip of the guide member, and the tensile force is transmitted to the concrete part on the back side of the plate, which is attached to the back side of the plate, and the small room defined by each rib is transmitted. The shearing force is transmitted to the concrete part through the ribs and the anchor bolts, respectively, through anchor bolts that penetrate vertically and whose tips are anchored in the cement-based concrete cast on the back side of the small room. .

Furthermore, the vibrations applied to the guide surface of the guide member are suppressed by a ferrite-containing resin with high damping performance filled in a small chamber defined by a group of vertical ribs with horizontal ribs at the tips planted on the back side of the plate. It is absorbed by the air and is further attenuated by the concrete placed at the back of the room.

(Effects of the Invention) According to the present invention, the vibration transmitted to the guide member is transmitted to the ferrite-containing resin filled in the small chamber defined by the vertical rib group having the horizontal rib at the tip of the back surface of the guide member. After being absorbed by the concrete, it is further attenuated by the cement-based concrete at the back of the small room, resulting in extremely high damping performance.

Although ferrite-containing resin has a high damping constant of 10 to 20 times that of cement-based concrete, its elastic coefficient is small at 1/100 to 1/200, so it can be used alone in areas that require precision or are subject to large loads. However, according to the present invention, the ferrite-containing resin is loaded in a small chamber defined by the rib group on the back side of the guide member, so only a small amount of force is required, and high damping performance is achieved. will be fully utilized. The high attenuation rate material made of the ferrite-containing resin was loaded into the small chamber due to the low elastic modulus of the ferrite-containing resin, which prevents distortion from increasing when a load is applied. It's for a reason. It is also cheaper than if the entire structure were made of highly stiffened ferrite resin concrete.

Further, when the guide surface is made of fine ceramics having excellent friction resistance, heat resistance, and high precision, poor damping properties become a problem, but according to the present invention, vibrations can be suppressed to a small level.

(Embodiment) The illustrated embodiment in which the present invention is applied to the bed of a milling machine will be described below.

(1) is a guide member made of metal or fine ceramics, and has a plurality of vertical ribs 2 on the back surface of the plate, and has a shape that closes the area surrounded by each of the ribs 2. A horizontal rib 3 is provided at the tip of each vertical rib 2, and a number of independent small rooms are defined on the back surface of the guide member 1 by each of the ribs 2 and 3.

An anchor bolt 4 is attached to the back surface of the guide member 1, and is inserted vertically into an opening 5 of a larger diameter than the anchor bolt 4 provided in the horizontal rib 3, and a nut 6 is screwed onto the tip of the anchor bolt 4. has been done.

Further, a ferrite-containing resin 7 having high vibration damping performance (for example, ferrite vibration damping material DP-005: trade name, manufactured by NEC Kankyo Engineering Co., Ltd.) is loaded into the small room through the opening 5.

After the ferrite-containing resin 7 is completely solidified, cement-based concrete 8 is injected into the back of the guide member 1, and as the concrete 8 hardens, a bed of a milling machine is formed in which the concrete part is integrated into the small room. Said concrete 8
The threaded portion of the nut 6 at the tip of the anchor bolt 4 is fixed to the portion.

Since the illustrated embodiment is constructed as described above, the compressive force applied to the guide member 1 is transmitted from the vertical ribs 2 via the horizontal ribs 3 to the concrete section 8.

Further, the tensile force is transmitted to the concrete section 8 by the anchor bolt 4 and the nut 6, and the shear force is transmitted to the concrete section 8 by the vertical rib 2 and the anchor bolt 4, respectively.

Further, the vibrations applied to the guide member 1 are absorbed by the ferrite-containing resin 7 filled in the small room, and then further damped by the concrete 8.

2 and 3 show another embodiment of the present invention, in which a tightening plate 9 which also serves as a leg is provided on the bottom of the concrete part 8, and is tightened with a bolt 10 attached to the guide member 1. The bolt 10 and the tightening plate 9 are made to act effectively against the tensile force.

By filling the hollow portion provided in the binding plate 9 with ferrite-containing resin 7, external disturbances are prevented from being transmitted to the guide member 1 via the leg portions.

Note that it is effective to make the bolts 10 also serve as anchor bolts and to arrange the anchor bolts 4 in a staggered manner because the force is dispersed.

In manufacturing the embodiment shown in FIGS. 2 and 3, the guide member 1 having the vertical rib 2 with horizontal rib 3 and the anchor bolt 4 is set upside down with the guide surface facing down, and the small The ferrite-containing resin 7 is injected into the room, and after it hardens, cement-based concrete 8 is placed on the back side, and then the ferrite resin 7 is injected into the hollow part of the binding plate 9 using the injection port 11 and the air vent 12. It is.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited to these embodiments, and can be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment in which the present invention is applied to the bed of a milling machine, FIG. 2 is a longitudinal sectional view showing another embodiment of the invention, and FIG. 3 is a plan view thereof. 1... Guide member, 2... Vertical rib, 3... Horizontal rib, 4... Anchor bolt, 7... Ferrite-containing resin.

Claims (1)

[Claims] 1 A plurality of vertical ribs each having a horizontal rib at the tip are planted on the back surface of a plate of a guide member made of metal or fine ceramics, and an anchor material that vertically penetrates a small chamber defined by each rib is attached to the plate. It is attached to the back, and each of the small rooms is filled with ferrite-containing resin, cement concrete is poured on the back of the small room, and the tip of the anchor material is fixed in the poured concrete. A concrete structure for machine tools characterized by the following.