JPS6051963B2 - punching device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a drilling device using a drill.

When drilling a through hole in the part to be machined of a workpiece, burrs are generated on the edge of the through hole on the underside of the workpiece, which necessitates deburring after the drilling process, increasing the number of machining holes and product cost. There is a problem in that it causes In view of the above points, it is an object of the present invention to provide a drilling device that can automatically remove burrs generated during drilling by simple means at the same time as they occur.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a base of a drilling device, above which an elevating arm 2 is disposed, and a drill 4 is attached to a pair of spindles 3 of the elevating arm 2, respectively. ing. A fixing device 5 is provided on the upper surface of the base 1 to fix a piston P of an automobile brake wheel cylinder as a workpiece in a fixed position. The fixing device 5 includes a substrate 6 fixed on the base 1, columns 7 erected at the four corners of the upper surface of the substrate 6, a drill guide plate 8 fixed to the upper ends of these columns 7, and these columns 7. It consists of a workpiece receiving plate 9 fixed to an intermediate portion of the workpiece receiving plate 9, a presser arm 10 and a rotating round bar 11 disposed below the workpiece receiving plate 9. A pair of drill bushes 12 for guiding the raising and lowering of the drill 4 are press-fitted into the drill guide plate 8, and a U-shaped notch 13 for work relief passing between the drill bushes 12 is opened at the front of the drill guide plate 8. There is. A V-shaped notch 14 for supporting the workpiece arranged below the notch 13 is opened on the front surface of the workpiece receiving plate 9, and a V-shaped notch 14 is formed on the upper surface thereof at a distance equal to the distance between the axes of both drills 4. A pair of U-shaped guide grooves 15 are formed that extend to sandwich the apex of the notch 14. A rectangular bar-shaped holder 17 having a cylindrical hole 16 opening upward is slidably fitted into each guide groove 15 , and the cylindrical hole 16 of each holder 17 is located directly below each drill 4 . A metal cylindrical workpiece mounting block 19 having a drill receiving hole 18 opening upward is fitted into the cylindrical hole 16 of the holder 17 . Work placement block 19
The bottom surface of the workpiece mounting block 19 is configured to be rotatable relative to the holder 17 by contacting a steel ball 21 engaged with the edge of a small diameter hole 20 opened in the bottom surface of the holder 17 .
An annular groove 22 is formed on the outer circumferential surface of the work/placement block 19, and a bolt 23 is inserted so as to be able to engage with the annular groove 22.
are screwed together from the outer surface of the holder 17. The drill receiving hole 18 of the workpiece mounting block 19 is drilled to have the same diameter as the through hole formed in the workpiece to be processed. The workpiece placement block 19 is fixed by engaging with the annular groove 22 of the placement block 19, and the holders 17 are each fixed to the workpiece receiving plate 9 by a pair of bolts 24 screwed into each drill guide plate 8. After drilling the drill receiving hole, the bolt 23 is moved back so that its tip is separated from the bottom surface of the annular groove 22 of the workpiece placement block 19, and the workpiece placement block 19 is returned to a rotatable state. In the figure, reference numeral 25 indicates a cutting oil drain groove. During drilling work, the small diameter body of the piston P? is inserted between each holder 17, and the flange part F, which is the part to be processed, is inserted into each workpiece mounting block 19.
and the drill guide plate 8, the flange portion F is placed on the upper surface of each workpiece placement block 19, and the piston P is supported by the workpiece placement blocks 19.

In this case, the end E protruding from the flange F of the piston P
is fitted into the notch 13 of the drill guide plate 8, so the work of supporting the piston P can be carried out without any problem. Then, the outer peripheral surface of the large-diameter body B2 of the piston P is brought into contact with each slope of the notch 14 to position the piston P, and the large-diameter body B2 is positioned.
A rotary round bar 11 is placed in the web engaging groove G of the groove portion protruding from 2.
5, and then the piston P is pressed and fixed to each slope of the notch 14 and the round bar 11 by the pressing arm 10.
Then, each drill 4 is lowered while rotating, and a through hole h1 is bored in the flange portion F through each drill bush 12. When each drill 4 enters the drill receiving hole 18 of the workpiece placement block 19, each workpiece placement block 19 rotates due to its rotational force, and as a result, the mouth edge of the through hole h1 is rubbed by each workpiece placement block 19. Therefore, due to the friction, the beam on the rim of the through hole h1 is automatically removed at the same time as it occurs! be done. If the drill receiving hole 18 of the workpiece placement block 19 becomes worn due to repeated drilling operations, the workpiece placement block 19 may be replaced with a new one.
In order to easily replace the cylindrical holes 16, a plurality of cylindrical holes 16 are formed in a row at predetermined intervals in each holder 17, and a workpiece mounting block 19 is fitted into each holder 17 in advance.
7 in the direction of the arrow in FIG. 2 to position a new workpiece mounting block 19 below each drill 4. Note that the workpiece mounting block 19 can also be directly rotatably provided on the workpiece fixing device 5. As described above, according to the present invention, a workpiece fixing device for fixing a workpiece to be drilled therein is disposed below the drill, and the workpiece is attached to the workpiece fixing device in close contact with the lower surface of the workpiece to be machined. A workpiece placement block is rotatably provided to support the workpiece placement block, and the workpiece placement block is configured to receive the drill that has passed through the workpiece portion and transmit the rotational force of the drill to the workpiece placement block. Since the drill receiving hole is provided, after drilling the through hole in the workpiece, the drill can be inserted into the drill receiving hole of the workpiece placement block to rotate the workpiece placement block. By rubbing the hole edge with a block, burrs on the through hole edge can be automatically removed as they occur due to the friction. Therefore, deburring work after forming the through holes can be omitted, and the number of processing steps and product cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS The drawings show one embodiment of the present invention, and FIG. 1 is a front view taken longitudinally of the main parts, FIG.
FIG. 3 is a sectional view of the block attachment portion.

F...Flange part as the processed part, P...
...Piston as a workpiece, 4..Drill, 5..Workpiece fixing device, 18..Drill receiving hole, 19..Workpiece mounting block.

Claims (1)

[Claims] 1. A workpiece fixing device for fixing the workpiece to be drilled is provided below the drill, and a workpiece mounting block that supports the workpiece in close contact with the lower surface of the workpiece to be machined is rotated on the workpiece fixing device. The workpiece mounting block is provided with a drill receiving hole for receiving the drill that has passed through the workpiece portion and transmitting the rotational force of the drill to the workpiece mounting block. Device.