JPS586580Y2 - Drilling device for square pipe material - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a device for drilling holes in square pipe materials.During drilling, cuttings remain in the hole of the receiver mold by punching down, and the cuttings are removed. If not, the first punch is used to form a temporary punch hole that does not allow any cuttings to fall into the mold hole of the receiving mold, and the second hole on the rear side of the receiving mold is removed. The structure is such that two punches are used to make a hole in the inner space of the square pipe material to allow cuttings to fall.

As illustrated in Fig. 1, the conventional drilling machine for punching a large number of longitudinally elongated support holes in tandem at a required pitch on the outer wall of a square pipe material a is as shown in Figs. 2 to 4. An elongated mold hole 2 as shown in the figure is provided on the upper surface of the receiving mold 1 which is inserted into the inner space of the square pipe material a in a substantially tight-fitting manner, and a discharge groove 3 with which the lower end of the mold hole 2 communicates is formed on the lower surface. A support pipe 4 which also serves as a supply of pressurized air is connected to this receiving mold 1, and a punch 5 is provided to punch a hole into the mold hole 2, and a punch 5 is installed to connect the supporting pipe 4 and the receiving mold. 2 is inserted into the square pipe material a, and then the square pipe material a, the receiving mold 1, and the punch 5 are moved relative to each other at a constant feed pitch, and each time the hole is punched, the punch 5 is moved. It has a structure in which the cutting chips C are dropped into a discharge groove 3 and blown away by pressurized air supplied from a support pipe 4 to be discharged. As shown in FIG. 4, it is often the case that the cutting chips C are obliquely stuck in the mold hole 2 and do not fall into the discharge groove 3, and the next hole becomes a resistance to the punch 5 when punching down. If strange vibrations or sounds are emitted, or if there is a hole, the punch 5 may break.
It has a defect that causes the mold hole 2 to be missing.

The present invention eliminates this defect. Figures 5 to 9 show a preferred embodiment of the present invention, and the upper surface of the receiving mold 11, which is inserted into the inner space of the square pipe material 16 in a nearly tight fit, has a hole corresponding to the size of the punch. A mold groove 12 into which only the side edges enter is provided with a narrow width and opened in the direction of relative movement, and a support member 13 is connected to the front side of the receiving mold 11.

The punch for punching consists of a first punch 14 corresponding to the mold groove 12 of the receiving mold 11, and a second punch 15 located away from the rear side of the receiving mold 11, and each of these punches 14 and 15 One or more pieces are grouped together, and each arrangement pitch P
is the same as the pitch of the vertically elongated support holes 20 formed in the square pipe material 16 (see FIG. 1).

The length of the receiving mold 11 is made to match the number of first punches 14.

The first punch 14 has a length such that the tip of the punch causes a slightly smaller punch than the thickness H of the outer wall of the square pipe material 16, and the tip of the second punch 15 has a length that allows the tip of the punch to penetrate the thickness H of the outer wall.

As shown in FIG.
The square pipe material 16 is inserted from the right side of the figure), and then the hole drilling work is carried out while sending the square pipe material 16 back at a large pitch P that matches the installation pitch of the first punch 14 and second punch 15. When the square pipe material 16 is in the position shown in FIG. 6, only the first punch 14 is in action, and the second punch 15 is in a position off to the right (rear side).

At this position, when the first and second punches 14 and 15 are driven down with the same stroke to the aperture shown in FIG. 7, only the first punch 14 is driven into the outer wall 17 of the square pipe 16.

However, as can be seen from the illustration of the support hole in FIG. 1, the support hole 20 is an elongated hole that is long in the vertical direction and narrow in the horizontal direction, and the first punch 14 is used to punch down slightly smaller than the outer wall thickness H. Therefore, even if there is no supporting edge of the mold groove 12 of the receiving mold 11 on the outer wall 17 not only in the vertical direction but also in the horizontal direction, the narrow horizontal direction is sheared at the same time, and the punching can be performed without punching holes. As shown in FIG. 9, the removed wall thickness is extruded into the mold groove 12 of the receiving mold 11 to form a temporary punch hole 18 with a thin connecting edge 19 on all four sides.
Do not fall during 2.

Next, move the square pipe material using the large pitch P as shown in Figure 8, and then punch the second punches 14 and 15 down.
9, a main punching hole 20 is drilled here, and the scraps 21 fall to the rear side of the receiving mold 11, and enter the mold groove 1 of the receiving mold 11.
2, a temporary punch hole 18 is formed by the first punch 15.

The wall thickness that protrudes into the mold groove 12 due to the formation of the temporary punch hole 18 shown in FIG.
1'- protruding inward! move by sliding.

As is clear from the above description, in the present invention, a temporary punch hole 18 is formed in a square pipe material 16 using a first punch 14 in an outer wall 17, and is long in the vertical direction and narrow in the horizontal direction by shearing without punching it completely. , the hole is drilled by a two-step operation in which the second punch 15 is passed through the temporary punch hole 18 to form the main punch hole 20, and since the first punch 14 is received by the receiving mold 11, the square pipe material The temporary punch hole 18 can be strongly formed without distorting the hole 16.

Further, since the cutting chips are held by the thin connecting edge 19 without falling, there is no possibility that the receiving mold 11 will be clogged with cutting chips.

The second punch 15 enters the temporary punch hole 18 in the part where there is no receiving die to form the main punch hole 20.
Since the connecting edges 19 around the four circumferences of 8 are weak, they do not give enough impact to distort the square pipe material 16, and the scraps 20 generated at that time are attached to the square pipe material 1 at positions unrelated to the receiving mold 18.
6, it is possible to drill holes at the required pitch very smoothly, and it has various effects such as being able to prevent failures such as broken punches and missing molds.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a rectangular pipe material a in which a large number of elongated support holes are bored in tandem, Figs. 2 to 4 illustrate a conventional device, Fig. 2 is a perspective view of a receiving mold 1, and Fig. 3 is a vertical side view, and FIG. 4 is a partially enlarged vertical side view. 5-9 show an embodiment of the present invention, FIG. 5 is a perspective view of the receiving mold 11 and the first and second punches 14, 15, and FIG.
The figure is a longitudinal side view showing the work order, and Figure 9 is temporary punch hole 1.
8 and a vertical side view showing the main punch hole 20. FIG. 11... Receiving mold, 13... Supporting material, 14... First punch, 15... Second punch, 16... Square pipe material, 17... Outer wall, 18... Temporary Punch hole, 19... Connecting edge, 20... Main punch hole, 21... Punch scrap.

Claims (1)

[Scope of utility model registration request] A receiving mold with a support member passing through the internal space connected to the internal space of the square pipe material is inserted in a nearly tight fit, and a hole punch corresponding to the receiving mold is provided on the outside of the square pipe material, The square pipe material, the receiving mold, and the hole punch were moved relatively at a constant feed pitch to narrow the wide width in the direction perpendicular to the direction of relative movement of the receiving mold on the outer wall of the square pipe material. Drilling of elongated support holes at a required pitch is performed using a device that matches the wide width of the receiving mold, and provides an open mold groove 12 in the direction of relative movement to correspond to the receiving mold 11. To make the holes, the first punch 14 and the second punch 15 on the rear side in the direction of relative movement of the receiving mold 11 are provided to match the feed pitch described above, and the first punch 14 has a punch tip that is The length of the second punch 15 is such that the punching down is slightly smaller than the thickness of the outer wall of the square pipe material, and the second punch 15 has a length that allows the tip of the punch to penetrate the outer wall thickness. A device for drilling holes in square pipe material, characterized in that it is configured to punch a hole into a temporary hole to make a permanent hole.