JPH0524401Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a center hole lubrication device for a machine tool, that is, a device for injecting lubricating oil from the center side into the center hole of the end face of a workpiece.

PRIOR ART A pair of centers supported by the headstock and tailstock of a machine tool and facing each other horizontally rotatably support the center hole in the end face of a workpiece with the tips of their cones. When grinding a workpiece with such a machine tool, it is necessary to lubricate the center hole in the end face of the workpiece sufficiently by injecting oil into this part in order to prevent the workpiece from running out and maintain machining accuracy.

Problems to be Solved by the Invention Since the center holes are manually lubricated for each workpiece one by one, the workability is very poor. Also, when lubricating, oil may be accidentally deposited on the surface to be ground of the workpiece, and if the oil is not wiped off, the grinding wheel will become clogged more quickly, reducing the number of times the grinding wheel is dressed. There was a drawback that the number of grinding wheels increased, and as a result, the number of whetstones decreased quickly.

Means for Solving the Problems In order to solve the above problems, the center hole lubrication device for a machine tool of the present invention has a conical center hole provided on the end face of the workpiece at the tip of the conical part of the center. A center hole lubrication device for a machine tool, in which a coupling is attached to the center of the center hole, the coupling is rotatably supported and contains lubricating oil to be supplied to the center hole; , a conical hole having the same shape as the conical part and tightly fitted onto the conical part, and a through hole having an opening in contact with the pointed end protruding from the front face opposite to the end face, and one end communicating with the oil filler port. The other end has an outlet portion communicating with the front surface and the opening, and is provided with a thin oil groove bored diagonally downward on the surface of the conical hole, and the outlet portion is located in a peripheral portion of the center hole. It is located at a position that roughly corresponds to the

Function: The lubricating oil supplied into the oil filler port of the coupling ring flows down the oil groove along the conical portion of the center, and is guided to the tip of the center, that is, the center hole in the end face of the workpiece.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 4 is a perspective view of a machine tool according to an embodiment of the present invention. In this figure, one center 3 is fixed to the headstock 2 on the bed 1, and a tailstock is fixed at any position on the bed 1 depending on the length of the workpiece (see Fig. 2) 4. 5 supports the other center 7, which faces the center 3 in the horizontal direction and is moved in and out by operating a handle 6.
Note that 8 is a grinding wheel that can be moved in the axial direction of the workpiece, and 9 is a cooling liquid supply means to the grinding section.

As shown in FIG. 2, both the centers 3 and 7 are the tips 3b and 7 of the conical portions 3a and 7a that protrude toward each other.
b is the center hole 4 formed on both end surfaces of the workpiece 4.
b and 4c, the center hole is rotatably supported.

As shown in FIG. 3, a drive pin 11 protrudes from a disc 10 that is rotationally driven concentrically with respect to the center 3, and near one end of the workpiece 4 there is a burr 12 with which the drive pin 11 engages. It is fixed with screws 13. That is, the disk 10 rotates the workpiece 4 via the drive pin 11 and the cutout 12.

Figure 1 shows the center 3 on the spindle side shown in Figure 2.
A state in which a coupling ring 14 for supplying lubricating oil is provided is shown. As shown in this figure, the coupling ring 14 has a through hole that fits into the center 3, and a part of this through hole becomes a conical hole 14a having the same shape as the conical part 3a of the center 3. The hole 14a is tightly fitted onto the conical portion 3a of the center 3, and the coupling ring 14 is fixed to the center 3 with a screw 15. Therefore, since the tip 3b of the conical portion 3a supports the workpiece 4,
It protrudes from the front surface 14b of the coupling ring 14.
Further, inside the coupling ring 14, there is an oil filler port 14c located at the upper part of the conical portion 3a of the center 3, and a thin oil groove leading from the oil filler port 14c to the tip 3b along the surface 3c of the conical portion 3a of the center 3. 14d
is formed.

The lubricating oil 16, such as high clay grease, is injected into the oil inlet 14c, that is, the oil groove 14d. At the outlet 14e of the oil groove 14d, this lubricating oil 16 gradually melts and flows into the center hole 4b due to frictional heat generated when the center hole 4b of the workpiece 4 rotates with respect to the tip 3b of the center 3. At the same time, as the lubricating oil 16 begins to melt, the lubricating oil 16 in the oil groove 14d flows obliquely down the surface 3c of the conical portion 3a of the center 3 toward the outlet portion 14e. Due to this action, the oil filler port 14
The lubricating oil 16 in c is automatically sequentially injected into the center hole 4b.

Further, although the center hole 4c on the right side of FIG. 2 is normally cooled with a cooling liquid, it is also possible to attach a coupling ring similar to the above to the center 7 and thereby lubricate the center hole 4c on the right side. .

Effects As explained above, according to the center hole lubrication device for a machine tool according to the present invention, as the workpiece rotates, the lubricating oil in the oil filler port is automatically filled into the center hole of the workpiece. When grinding,
There is no need to lubricate the center hole of the work each time, and work efficiency is therefore significantly improved. Also, since oil is applied only to the center hole on the end face of the workpiece,
Lubricating oil does not adhere to the surface to be ground, that is, the circumferential surface of the workpiece. That is, clogging of the grinding wheel due to the lubricating oil is prevented, and therefore the number of times the grinding wheel is dressed is reduced, which also has the effect of slowing down the wear of the grinding wheel. In addition, the center hole oiling device for a machine tool according to the present invention is inexpensive because a conventional center can be used as is without machining the center, and the oil groove is formed to descend obliquely. The lubricating oil is softened by the heat generated at the center tip and is automatically injected into the center hole. Therefore, there is an advantage that not only liquid lubricating oil but also lubricating oil such as grease can be used.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a center hole lubricating device for a machine tool according to an embodiment of the present invention, Fig. 2 is a front view of a workpiece supported between centers, and Fig. 3 is a perspective view of the drive mechanism of the workpiece. FIG. 4 is a perspective view of the machine tool. 3, 7... Center, 3a, 7a... Conical part, 3
b, 7b... Tip, 14... Coupling, 14
c...Oil filler port, 14d...Oil groove.

Claims (1)

[Claims for Utility Model Registration] A conical center hole provided on the end face of a workpiece is supported at the tip of a conical portion of the center so that the workpiece can rotate freely, and lubricating oil to be supplied to the center hole is accommodated. A center hole lubricating device for a machine tool, in which a coupled coupling is attached to the center,
The coupling ring includes: an oil filler port provided at an upper part; a conical hole having the same shape as the conical part and tightly fitted onto the conical part; and a through hole having an opening in contact with the pointed end protruding from a front face opposite to the end face. a hole, and a thin oil groove having one end communicating with the oil filler port and the other end having an outlet portion communicating with the front surface and the opening, and being bored diagonally downward on the surface of the conical hole. . A center hole lubricating device for a machine tool, wherein the outlet portion is provided at a position substantially corresponding to a peripheral portion of the center hole.