JPS625880Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a protective cover for a vertical sliding surface of a machine tool. In more detail, the grinding machine
The present invention relates to a protective cover that also serves as a lubricating oil receptacle to protect the vertical sliding surface of a slide for mounting a headstock of a milling machine or the like and the sliding surface of its guiding saddle from abrasive grains and chips.

Conventional protective covers are known as shown in FIGS. 2 and 3. A protective cover mounting plate 3 for attaching a bellows-type protective cover 2 to the underside of the saddle 1 largely protrudes from the bottom surface of the saddle 1. Therefore, since the maximum machining height of the workpiece is determined from this lower surface, the height of the machine must be increased.

As another example, in the case where the bellows-type protective cover 2 is attached between the protective cover mounting plate 3 attached to the bottom surface of the slide table 4 and the bottom surface of the saddle 1 as shown in FIGS. 4 and 5, the bellows shrink. The stroke between the upper and lower positions of the grindstone or cutter must be determined based on the bottom surface of the mounting plate 3 in the raised position. For this reason, the headstock 5
The amount of overhang from saddle 1 increases,
This causes a problem because the headstock 5 lacks rigidity. For this reason, many devices do not use a protective cover at all, as shown in FIG.

Now, going back to FIG. 1, the headstock 5 moves up and down guided by the saddle-side sliding surface X and the slider-side sliding surfaces Y, Y. Lubricating oil is applied to both sliding surfaces X, Y, and Y', but when this falls onto the machined surface of work W,
The slip effect impairs the machinability of tools such as grinding wheels and milling cutters. Therefore, in order to prevent this fall, in the present invention, a lubricating oil tray 6 and bellows 8, 8a are attached as shown in FIG.

Furthermore, if abrasive grains or chips adhere to both sliding surfaces X, Y, and Y', the headstock 5 will tilt, impairing the maximum machining accuracy of the workpiece. Grinding machines and milling machines require processing accuracy in the micron range, so it is necessary to cover the sliding surfaces to maintain workpiece processing accuracy. As mentioned above, for rigid sliding surfaces, there are cases where this measure is not taken at all, as shown in Figure 1, and cases where measures have been taken, as shown in Figures 2 to 5, but the measures are insufficient. There are cases.

The present invention makes it possible to protect such sliding surfaces with a simple structure. FIG. 6 shows a grinding machine in which a headstock 5 on which a grinding wheel 7 is attached is attached to a sliding table 4 that moves up and down using the guide surface of a saddle 1 as a guide. A bellows 8 having a U-shaped planar section for protecting the guide surface X of the saddle 1 and a bellows 8a having a U-shaped planar section for protecting the sliding surface Y on the sliding table side face each other and partially overlap to form the saddle 1. and is attached between each lower surface of the sliding table 4 and the lubricating oil receiver 6. 9 and 10
is a protective cover plate having an L-shaped cross section, and is attached to the left and right side walls of the sliding table 4 in series with the upper end of the bellows 8. In order to receive lubricant leakage from the sliding surface X, the saucer 6 is suspended by a pair of left and right lifting devices.

The lifting device is constructed as follows. Bearing 13
A shaft 12 that can be slid up and down is attached to the lower part of the slide table 4. A compression spring 11 is attached to the upper part of the shaft 12 between a bearing 13 and a nut 14 so that the spring force can be adjusted. A saucer 6 is fixed to the lower end of the shaft 12 with a nut 15.

A bellows 8 with a U-shaped flat section that protects the sliding surface X on the saddle side is attached between the lower surface of the sliding table 4 and the upper surface of the saucer 6, and the bellows 8 protects the sliding surface Y on the sliding table side.
A is attached to the lower surface of the saddle 1 and the upper surface of the saucer 6. Note that 16 is a pot with which the oil accumulated in the saucer 6 can be discharged after work.

Now, when the slide table 4 descends from the state shown in FIG. 9 to the saddle 1 as shown in FIG.
The bellows 8 remains contracted, and only the bellows 8 is contracted. When the spring 11 reaches its maximum extension, both bellows 8, 8a are in their minimum contraction state.

After the spring 11 reaches its maximum extension, the tray 6 descends as the sliding table 4 descends. As the saucer 6 descends, the bellows 8a extends. At this time, bellows 8 is the 10th
As shown in the figure, it is in the minimum shrinkage state. As the bellows 8a extends, of the sliding surfaces Y and Y' of the sliding table 4, the sliding surface Y' on the headstock 5 side is opened, but the sliding surface Y' is fixed to both side walls of the sliding table 4. It is covered by the protective cover plates 9, 10 which prevent the opening from occurring.

Conversely, when the slide table 4 rises, the bellows 8a remains in the minimum contracted state due to the spring 11.
is contracted to the minimum contracted state as shown in FIG. 9, and then when the saucer 6 is stopped by the contracted bellows 8a, the bellows 8 is extended. At this time, the compression spring 11 is
2 is compressed as it is pulled out from the slide table 4 as the slide table 4 rises.

As described above, the bellows 8, 8a attached between the lower surface of the saddle 1 and the sliding base 4 and the saucer 6 are attached to the sliding base 4.
It expands and contracts individually depending on the vertical movement of.

According to the present invention, the protective cover consisting of the bellows 8 and 8a attached under the saddle 1 and the sliding base 4 is always suspended by a compression spring, so that the amount of overhang of the protective cover below the saddle is minimized. Also, since the headstock is not limited in stroke by the protective cover, the maximum effective machining height of the workpiece is H ₁
-H ₂ (Fig. 1) can be expanded to approximately the same size as the conventional one without a protective cover.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of the slide without a protective cover. FIG. 2 is a front view of a known protective cover. FIG. 3 is a cross-sectional view taken from FIG. Figure 4 shows another example of a known protective cover. FIG. 5 is a cross-sectional view taken from FIG. Figure 6 shows a protective cover according to the present invention. FIG. 7 is a cross-sectional view of FIG. 6. FIG. 8 is a view taken along the - arrow in FIG. 6. FIGS. 9 and 10 are explanatory diagrams of the operating state of the protective cover. The left half of Figure 11 is a - arrow view of Figure 9,
Similarly, the right half is a view taken along arrows XI-XI in FIG. In the figure: 1...saddle, 2...protective cover, 3...mounting plate, 4...sliding base, 5...headstock, 6...oil pan, 7...grindstone, 8, 8a...bellows , 9, 10... Protective cover plate, 11... Compression spring, 12... Shaft, 13... Bearing, 14... Nut, 15... Nut, 16... Knock, X... Saddle side sliding surface, Y, Y'...Sliding surface on the sliding table side, W
……work.

Claims (1)

[Scope of utility model registration request] A shaft is slidably supported in the vertical direction via a compression spring at the bottom of the sliding base, a saucer is attached to the lower end of the shaft, and cross sections are formed between the saucer and the lower end of the slider and between the saucer and the lower end of the saddle. A protective cover for a vertical sliding surface of a machine tool, characterized in that a U-shaped bellows is mounted so that both bellows face each other, and a protective cover plate is fixed to the side wall of the sliding table in series with the bellows on the sliding table side. .