JPS6240749Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This device is used by fixing it to the table of a machine tool,
Concerning an tombstone for machine tools on which workpieces are attached,
In particular, the present invention relates to an tombstone for machine tools that incorporates a cooling device to prevent thermal deformation during machining.

Conventional technology Conventionally, machine tools, especially horizontal milling machines and horizontal machining centers, have been used to perform machining such as boring by fixing a tombstone on a table and attaching a workpiece to the surface of the tombstone facing the cutting tool. A method has been adopted to do so. In this case, cutting heat is generated during the cutting process, and as shown in FIG. back side 2
4 thermally expands with respect to the other tombstone surfaces, causing thermal deformation as shown by the broken line in the figure.

As a measure to prevent such thermal deformation, the machining area where the tool of the machine tool, the workpiece W, the tombstone 20, etc. are located has been surrounded by an appropriate enclosure, that is, a splash guard, and the machining area is surrounded by a splash guard. A method is adopted in which the tombstone is cooled together with the cutting engagement portion between the workpiece W and the tool by spraying the cutting fluid in a shower from all directions.

However, although this method directly achieves the purpose of preventing thermal deformation of the tombstone, it requires a large-scale splash guard to prevent cutting fluid from scattering, and it also depends on the size of the workpiece. The larger the tombstone is used, the more cutting fluid is required, which is uneconomical, and the more difficult it is for the operator to visually inspect the cutting situation.

OBJECT OF THE INVENTION Accordingly, an object of the present invention is to provide a tombstone for a machine tool incorporating a simple cooling device that can be applied to existing tombstones and eliminate the above-mentioned drawbacks.

In other words, according to the present invention, in a tombstone that is fixed to the table of a machine tool and on which a workpiece is attached, at least two surfaces of the tombstone wall including the back of the mounting surface of the workpiece Provided is a tombstone for a machine tool, comprising: a coolant piping mechanism for liquid cooling; and a cutting fluid supply device connected to the coolant piping mechanism; The blowing cutting fluid absorbs heat from the tombstone and cools it to prevent its thermal deformation.

Embodiments Hereinafter, the present invention will be explained in detail based on embodiments shown in FIGS. 2 and 3.

FIG. 2 is a general configuration diagram showing the structure of a tombstone for a machine tool according to the present invention and a machine tool to which it is attached, and FIG. 3 is a rear view of the tombstone taken along the arrow line in FIG. 2.

Now, FIGS. 2 and 3 show an embodiment in which the machine tool is a horizontal milling machine, and therefore, the column 10 moves along the Z-axis sliding surface 16a on the bed 16 along the Z-axis indicated by arrow Z. A spindle head 12 having a spindle 14 is mounted on the column 10 so as to be slidable in the vertical Y-axis direction indicated by arrow Y, and a tool T is attached to the spindle 14. There is. Further, a table 18 is mounted on the bed 16 at a position opposite to the column 10 so as to be slidable in the X-axis direction perpendicular to the paper plane of FIG. A cutting fluid blowing nozzle 26a is disposed in the vicinity of the spindle head 12, and is configured to blow and supply cutting fluid to a cutting portion between a tool T and a workpiece W to be described later. Cutting fluid is also blown out from the blowout nozzle 26b, cooling the workpiece attachment surface 22 of the tombstone 20 and the workpiece W. Cutting fluid is in cutting fluid tank 2
8 to the above-mentioned blow-off nozzle 26 through a filter 30a and a pump 32a via a piping line 34a.
a, 26b.

Now, in the milling machine configured as described above, the tombstone 20a for a machine tool according to the present invention is mounted and fixed on the table 18. The main body of this tombstone 20a for machine tools has exactly the same structure as the tombstone 20 shown in FIG.
A workpiece W is fixed to a mounting surface 22 facing the tool T of No. 4 by an ordinary appropriate clamping means. In other words, for this workpiece W, column 10
moves in the Z-axis direction and approaches the tool T to the workpiece W.
A desired cutting process is performed on the workpiece W by engaging the spindle head 12 in the Y-axis direction, moving the table 18 in the X-axis direction, rotating the spindle 14, and so on. The tombstone 20a according to the present invention has a rear surface 25 opposite to the mounting surface side on which the workpiece W is mounted.
A coolant piping mechanism 40 is provided on the side. This coolant piping mechanism 40 has a piping path 42 along the rear surface 25 of the tombstone main body, and a piping path 42 along the rear surface 25 of the tombstone main body, by connecting a plurality of pipe materials to each other with a pipe joint 44.
It has piping passages 46 protruding into the tombstone main body from appropriate positions of a large number of openings 27 that are normally bored in the tombstone 5, and furthermore, it has cooling liquid blowing nozzles 48 at appropriate locations on these piping passages 42, 46. It is formed by Moreover, this coolant piping mechanism 40 is connected to the pump 32b via the piping path 34b from the cutting fluid tank 28 mentioned above to the filter 30b.
A configuration is adopted in which cutting fluid is supplied by the action of a pump, and the cutting fluid is blown out as a cooling fluid from the blowing nozzles 48 of the cooling fluid piping paths 42 and 46 described above to the tombstone body. In other words, the cutting fluid tank 28, which is the cutting fluid supply source of the milling machine, is commonly used to receive the cooling fluid. Here, the cooling liquid blowing nozzle 48 provided at the appropriate location mentioned above injects the cooling liquid toward the back surface 24, rear surface 25, and both side surfaces 23, 23 of the mounting surface 22 of the tombstone main body, and the cooling fluid is sprayed toward the back surface 24, rear surface 25, and both side surfaces 23, 23 of the mounting surface 22 of the tombstone main body. The cutting heat transmitted from the workpiece W through the mounting surface 22 of the tombstone body is actively removed to cool the tombstone body,
In order to prevent thermal deformation, it is necessary to spray an appropriate amount of cooling liquid during cutting at least on the back surface 24 and rear surface 25, which have a relatively large heat transfer area. Note that it is desirable to provide throttle valves 50 (FIG. 3) at appropriate locations in the coolant piping mechanism 40 described above so that the supply amount of the coolant can be adjusted appropriately according to the generated heat, and each outlet A similar throttle valve may be disposed immediately in front of the nozzle 48 to adjust the amount of coolant blown out from each blowout nozzle 48 . In addition, the blowing nozzle 48
can be easily formed by simply making small holes at appropriate locations in the pipe material of the coolant piping mechanism 40.
Further, the coolant piping mechanism 40 may be fixed to the rear surface 25 of the tombstone body by tightening and fixing using appropriate clip means, or by welding or the like. Further, the coolant piping mechanism 40 and a coolant supply device including the cutting fluid tank 28 and the like may be connected and separated as appropriate.

In addition, the cooling liquid that cooled the tombstone body is discharged into the bed 16 of the machine together with the cutting liquid injected into the cutting part.
The waste is collected from the collection path formed in the area.

Effects of the Invention As is clear from the above explanation, according to the present invention, cooling liquid is blown directly onto each tombstone surface to which cutting heat is transferred in a tombstone for a machine tool.
Heat removal cooling can be achieved effectively, and wasteful consumption of the coolant can be prevented.Moreover, since the coolant is blown out from the coolant blowout nozzle close to each tombstone surface, it also has a scattering prevention effect. big. In addition, we installed piping for the cooling fluid to pass through the existing tombstone.
The structure is simple because the piping is simply connected to the cutting fluid supply device that the machine tool normally has.
Furthermore, even in machining where cutting fluid should not be applied to the workpiece, according to the present invention, it is possible to supply cooling fluid only to the tombstone body to perform heat removal cooling, making it possible to achieve optimum results in the cutting part. It is also possible to obtain the machining conditions, and it is possible to prevent thermal deformation of the tombstone and improve machining accuracy.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional tombstone for machine tools and its problems; Fig. 2 is an overall configuration diagram showing the structure of the tombstone for machine tools according to the present invention and the machine tool to which the tombstone is attached; The figure is a view taken from the back of the tombstone along the arrow line in FIG. 2, and clearly shows the coolant piping mechanism. 20...Tombstone, 28...Cutting oil tank, 3
2a, 32b...pump, 40...coolant piping mechanism, 42, 46...piping path, 48...blowout nozzle, 50...throttle valve, W...workpiece.

Claims (1)

[Claims for Utility Model Registration] 1. In a tombstone used to be fixed to the table of a machine tool and to which a workpiece is attached, a piping device connected to a cutting fluid supply device of the machine tool is routed around the tombstone, and a tombstone wall is connected to the tombstone. Nozzles for blowing out cutting fluid to cool at least two surfaces including the back of the mounting surface of the workpiece are provided at a plurality of locations on the piping device, and throttle valves for adjusting the amount of fluid to be blown are provided at appropriate locations on the piping device. 1. A tombstone for a machine tool, characterized in that the tombstone is provided in the nozzle and blows cutting fluid out of the nozzle to prevent thermal deformation of the tombstone due to cutting heat. 2. The tombstone for a machine tool according to claim 1, wherein the piping device is connected to the cutting fluid supply device and the tombstone by a coupling that can be freely connected and separated.