JPH0417286Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a holding device, and more particularly to a holding device that prevents hole misalignment when drilling a plurality of laminated thin plate materials with a drilling machine.

[Prior art and its problems]

Generally, in order to drill holes in thin plate materials used for aircraft body structural parts, the workpiece is placed on a workbench 1 with a plywood scrap board 1b placed on a wooden table 1a, as shown in Fig. 6. Thin plate material 2 to 5
6 sheets stacked and punching machine spindle (not shown)
The hole is being drilled with Drill 3 attached to the.

However, there is a drawback that when the chips 4 generated during drilling enter between the laminated materials, the material of the perforated portion lifts up, and the above-mentioned lifting phenomenon is particularly noticeable as the thickness of the material becomes thinner.

In addition, in order to continuously drill holes in the material 2, as shown in FIG. are doing. However, as described above, the material 2 around the clamp hole 5 is lifted by the chips 4 during drilling, so the surface of the entire material is not flat. For this reason, when drilling material near the clamp point, the drill 3 may slide and the hole may be misaligned, and the distance between the hole and the clamp hole 5 differs between the upper and lower parts of the laminated material, resulting in this misalignment. Alignment has a major impact on ensuring accuracy in the next process when assembling aircraft parts.

Further, the clamp portion is fixed by a clamp bolt 6 with a Teflon collar 7 interposed therebetween, but since the material of the clamp portion is raised, the tightening of the clamp bolt 6 may cause scratches or dents on the surface of the material. Moreover, when the clamp bolt 6 was removed after cutting the material 2 into a predetermined shape, distortion occurred due to distortion of the surface of the material due to the tightening of the bolt.

[Purpose of invention]

Therefore, the purpose of this invention is to solve the problems of the above-mentioned conventional technology, prevent hole misalignment when drilling multiple laminated thin plate materials, and install it in a drilling machine to ensure product quality and increase mass production efficiency. The purpose of the present invention is to provide a holding device for

[Summary of the idea]

To achieve the above object, the present invention includes a base that can be attached around the spindle of a drilling machine;
at least three holding cylinders removably attached to the base such that cylinder axes are parallel to the axis of the spindle and point symmetrical with respect to the axis, and the holding cylinder is slidable within the holding cylinders; A fitted press rod, a press pad for the workpiece attached to the tip of the press rod, and a press pad accommodated in the holding cylinder to urge the press rod toward the workpiece. Spring means for biasing.

〔Example〕

Hereinafter, embodiments of the holding device according to the present invention will be described with reference to FIGS. 1 to 5.

In FIG. 1, reference numeral 8 indicates a spindle of a drilling machine (in this embodiment, an NC router), and a rotary shaft 9 connected to a drive unit (not shown) is rotatably held in the spindle 8. The above rotating shaft 9
A drill chuck 1 that holds a drill 3 is attached to the tip of the drill chuck 1.
0 is attached, and a holding device 11 is fitted to the spindle so as to surround the drill 3.

As shown in FIGS. 2 and 3, the holding device 11 includes a disc-shaped base 12 whose peripheral edge is formed as a rising mounting portion 2a, a plurality of holding cylinders 13...13, and pressing rods 14...14. It is equipped with In the center of the base 12,
An insertion hole 15 is formed so that the rotating shaft 9 of the NC router can be inserted through the base 12 without contacting it, and four mounting holes 16...16 are formed around the insertion hole 15.
are perforated at equal intervals in the circumferential direction. A female thread is cut into the inner peripheral surface of each of the mounting holes 16...16, and the holding cylinder 13 is screwed thereinto. Both ends of the holding cylinder 13 are open, and the upper end opening 13a of these openings is connected to the spindle 8 of the NC router.
The lower end opening 13b is closed by a stop ring 17. A pressing spring 18 and a piston 14a are housed in each of the holding cylinders 13 as spring means, and a rod 14b protruding from the stop ring 17 is fixed to the piston 14a.
Furthermore, a pressing flange 14c having a pressing pad 19 adhered to one side thereof is fixed to the rod 14b, and constitutes the pressing rod 14 as a whole. This pressing rod 14 is urged downward by the pressing spring 18, and is housed and held in the holding cylinder 13 so that its protrusion length from the stop ring 17 is maximized.

Furthermore, the mounting portion 12a of the base 12 includes:
A female threaded hole 20 is bored in the radial direction, and the holding device is fitted and fixed onto the spindle 8 of the NC router by means of a fixing screw 21 that is threaded into the female threaded hole 20.

Next, the operation of the holding device configured as described above will be explained.

As shown in FIG. 1, after a plurality of thin plate materials 2 are stacked on a workbench 1, the NC router spindle 8 is moved so that the drill 3 is positioned at a predetermined drilling location. Once the position of the drill 3 is determined, the spindle 8 is gradually lowered. As the spindle 8 descends, the press pad 19 of the press flange 14c at the tip of the press rod 14 housed and held in the holding cylinder 13 comes into contact with the surface of the material 2, and as the spindle 8 continues to descend, the press rod 14 is accommodated in the holding cylinder 13 against the spring force of the pressing spring 18, and the pressing force of the pressing rod 14 on the material increases accordingly. Therefore, drilling can be performed with the plurality of thin plate materials 2 in complete contact with each other, and chips generated by drilling will not enter between the materials.
The material at the perforation will not lift up.

In addition, as shown in FIG. 4, the material 2 can be pressed and held even at a stepped portion to make a hole, and as shown in FIG. Even when the material 2 is located on the clamp bolt 6, the other pressing rod 14 can press and hold the material 2 and drill the hole.

[Effect of idea]

As described above, according to the present invention, by attaching the main holding device to the spindle and pressing around the perforation position of a thin plate material made of a plurality of laminated sheets with a pressing rod, it is possible to perform perforation while the above-mentioned materials are in complete contact with each other. Therefore, cutting chips will not enter between the materials and cause the materials to lift up, and even when drilling the above-mentioned materials continuously, the holes are pressed by pressing the material at each drilling position, so hole misalignment will occur due to the lifting of the above-mentioned materials. There is no problem, and highly accurate drilling can be performed.

Further, by using the above-mentioned pressing rod, the number of clamp bolts for fixing the material on the workbench can be minimized, and scratches and dents on the surface of the material due to tightening of the clamp bolts can be prevented. In addition, since the clamp bolt does not forcefully clamp the material that has been lifted up by cutting chips, even if the clamp bolt is removed after the material has been cut into a predetermined shape, there will be distortion due to excessive tightening of the bolt. will not occur in the cut material.

Furthermore, since the material does not float up during drilling, the feed speed of the drill can be increased, and various effects can be obtained, such as the ability to increase the effectiveness of mass production.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing the usage state of the holding device according to the present invention, FIG. 2 is a perspective view of the holding device,
Figure 3 is a plan view of the upper holding device, Figures 4 and 5.
The figure is a partial sectional view showing another usage state of the holding device, and FIGS. 6 and 7 are partial sectional views showing conventional drilling. 1... Workbench, 2... Thin plate material, 3... Drill, 4... Chips, 6... Clamp bolt, 7...
Teflon collar, 8... Spindle, 9... Rotating shaft, 10... Drill chuck, 11... Holding device, 12... Base, 13... Holding cylinder, 1
4...Press rod, 14c...Press flange, 1
5...Insertion hole, 16...Mounting hole, 17...Stop ring, 18...Press spring, 19...Press pad, 21...Fixing screw.

Claims (1)

[Scope of utility model registration request] a base that can be attached around a spindle of a drilling machine; and at least three or more cylinders that are removably attached to the base such that the cylinder axis is parallel to the axis of the spindle and is point symmetrical with respect to the axis. A holding cylinder, a pressing rod slidably fitted in the holding cylinder, a pressing pad for the workpiece attached to the tip of the pressing rod, and a pressing rod housed in the holding cylinder to press the pressing rod. 1. A holding device comprising: a spring means for biasing a pressing button toward a workpiece by applying a biasing force.