JPH0131396Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a table for a tapping drilling machine having a horizontal floating mechanism.

In addition to drilling, a tapping drilling machine uses a so-called float mechanism installed between the spindle that attaches the tap to the tip and the handle that moves the spindle up and down to prevent the tap from breaking. prevention and allows for highly accurate screw tapping.

Since the float mechanism in this case often works only in the vertical direction of the screw, it was necessary to align the center of the screw pilot hole and the tap quite accurately. In order to perform this alignment work roughly, a tapper with a built-in alignment device may be attached to the spindle. However, in a tapping drilling machine in which drilling and tapping can be switched with a simple operation, it is troublesome to attach the tapper to the spindle only during tapping.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to provide a tapping drilling machine with a so-called horizontal float mechanism (assuming tapping is performed in the vertical direction), in which the pilot hole of the screw follows the tap.
The purpose is to improve the efficiency of tapping work and prevent breakage of taps.

The upper plate on which the work to be tapped is placed is
It is supported by a ball so that it can be moved by the amount of deviation between the screw pilot hole and the center of the tap, and is automatically returned to the center position by a spring, so that even if the screw pilot hole and the center of the tap are slightly shifted, The present invention provides a table having a float mechanism that allows tapping processing.

The lower plate 1 is provided with a hole 1a for receiving a ball 2, a groove 1b for accommodating a spring 3, a hole 1c for passing a screw, and a screw for receiving a set screw 8. Hole 1a
The diameter of the hole is 2 to 3 mm larger than the diameter of the ball 2, and the bottom of the hole has a conical shape with a slightly lower center. The upper plate having the bush 5 in the center has a hole 4a on the lower side opposite to the hole 1a and a screw hole at a position opposite to the hole 1c, and is placed on the lower plate through the ball 2. The spring 3 is compressed and enters the groove 1b, pushing the bush 5 towards the center. The hole in the center of bush 5 serves as a relief for a drill or tap. The lower plate 1 and the upper plate 4 are coupled with screws 7.
In this case, a gap C is provided so that the upper plate 4 can slide horizontally with respect to the lower plate 1. The ring 6 is attached to the outer periphery of the upper plate 4 to prevent chips and dirt from entering. The lower plate 4 is made larger than the upper plate 4 so that it can be supported by hand. Although not shown, the upper plate 4 has screw holes and the like to which a workpiece or a vise can be attached. In addition, the screw holes 8 are arranged so that the upper plate 4 is connected to the lower plate 1.
This is to fix it so that it does not shift.

In such a configuration, the ball 2 is located in the center of the hole 1a and the hole 4a due to the conical surface,
The lower plate 1 and the upper plate 4 are made concentric by a spring 3.

Now, when tapping a workpiece attached to the upper plate 4, even if the center of the screw pilot hole and the tap are misaligned by about 1 mm, when the tap is inserted into the screw pilot hole, the tap will follow the tap in the X and Y directions. The workpiece moves to . When the tapping is about to start, the upper plate 4
rotates slightly, but the ball 2 is in the holes 1a and 4a.
When it hits the side surface, the rotation stops, and the upper plate 4 appears to be fixed to the lower plate 1, and the tapping progresses. When tapping to a predetermined depth is completed, the tapping is reversed. At this time, the tap will rotate slightly in the direction of rotation, but
The balls 2 hit the sides of the holes 1a and 4a, the upper plate 4 is fixed to the lower plate 1, and the tap comes out of the workpiece following the lead of the machined screw. Then, the upper plate 4 returns to the center position by the action of the spring 3, and is ready to start the next tapping operation.

In the case of drilling, by sliding the upper plate 4 horizontally against the lower plate 1 until it stops and tightening the set screw 8, the upper plate 4 can be firmly fixed to the lower plate with just one set screw. . 4b is a counterbore into which the head of the set screw 8 is inserted.

In the above embodiment, the spring 5 is illustrated as a compression spring, but the same effect can be obtained even if a tension spring is used. Further, although only the bottom surface of the hole 1a is made conical, if the top surface of the hole 4a is also made conical, the effect of placing the ball 2 in the center of the hole 1a and the hole 4a will be more reliable.

According to the present invention, the upper plate to which the work is attached is
Since the structure allows slight movement in the X, Y, and θ directions and returns to the center position when external force is removed, the following effects can be achieved.

(1) Even if the center of the screw pilot hole and the tap are misaligned, the screw hole can be tapped by following the tap, making tapping work more efficient.

(2) Since no unreasonable force is applied to the tap in the horizontal direction, breakage of the tap can be prevented.

(3) The structure is simple and the float mechanism is highly reliable.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the float mechanism according to the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. Figures 3 and 4 show lower plate 1, respectively.
FIG. 4 is a vertical cross-sectional view showing a method of coupling and fixing the upper plate 4 and the upper plate 4. FIG. In the figure, 1 is a lower plate, 1a is a hole, 2 is a ball, 3 is a spring, 4 is an upper plate, and 4a is a hole.

Claims (1)

[Scope of utility model registration request] A plurality of holes are provided on the lower surface of the upper plate on which the workpiece is placed, and a hole with a slightly lower center is provided on the upper surface of the lower plate opposite to the holes, and each ball has a diameter smaller than the diameter of the hole. A table for a tapping drilling machine which supports the upper plate by inserting it into a hole, and connects the lower plate with a spring attached to the lower plate so as to automatically return the upper plate to the center position.