JPS625788Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE PRESENT DEVICE The present invention relates to a hole punching device for punching a plurality of holes in the peripheral portion of a pressed part or the like.

Conventionally, this type of hole punching device, as shown in FIG. The sliders 3 are held by respective slide holders 4, and opposed sliders 3 are moved forward by a plurality of reciprocating cams attached to an upper die that is pressed down by a press, thereby drilling a hole in the side surface of the work on the die 1.

However, this conventional drilling device has the following drawbacks.

(1) Are there more than 4 or 5 drilling directions?
Or, if the drilling positions are close to each other, use a slide holder 4 that can handle the holes at once.
Also, since there is not enough space to install the reciprocating cam, it is not possible to drill holes in one step.

(2) As the number of holes to be drilled increases, the number of slide holders 4, reciprocating cams, etc. increases, resulting in a significant increase in cost. In particular, the slide holder 4 and the reciprocating cam are difficult to manufacture, and this tends to be the case.

(3) Since each slide holder 4 has an independent structure, the entire device becomes complicated and large.

(4) A number of reciprocating cams corresponding to the number of sliders 3 are required, and since these many reciprocating cams protrude from the upper mold that is pressed down by the press, safety is lacking.

This idea was created with these points in mind.
The purpose of this invention is to enable a drilling device that drills multiple holes on the circumferential side of a workpiece to expand the number of holes to be drilled and to bring the drilling positions closer to each other without making the device complicated or large. Therefore, in the present invention, a hole-making die is provided in the center of the annular slide holder, and the hole-making die is provided with a plurality of holes on the circumferential side into which the workpiece is inserted. A plurality of slide grooves are provided radially, a slider is slidably fitted into the slide groove, a hole punch is provided at the inner end of the slider facing the hole of the hole punching die, and each slider A forward sloping surface is provided at the outer end of the cam body, and each of the forward sloping surfaces is provided with a forward sloping surface formed in a conical shape on the inner circumferential surface of the annular forward cam body. A push-down portion for forcibly pushing down the forward cam body is disposed above the forward cam body which fits into the cam surface and has the forward cam surface, and further includes a backward return means for the slider. The configuration was set as follows.

Next, one embodiment of the present invention will be described based on FIGS. 2 and 3.

An annular slide holder 12 is fixed to the upper surface of the table 11, and a hole-making die 13 is fitted in the center of the slide holder 12.

This hole-making die 13 has an upper end portion into which a work 14 such as a press-formed part is fitted, and is formed with a small diameter, and a plurality of holes 16 are provided in a circumferential side portion 15 of this upper end portion. An opening 17 for mounting a workpiece 14 on the die 13 is provided above the die 13 . Further, a hole 18 for a punched piece is provided extending from the upper end of the punching die 13 to the lower surface of the table 11.

Further, a plurality of slide grooves 21 are provided in the slide holder 12 radially around the hole punching die 13, and a slider 22 is slidably fitted into the slide groove 21. A hole punch 23 is provided opposite the hole 16 of the hole 13.

Furthermore, a forward slope surface 25 is provided at the outer end of each slider 22, and the forward slope surface 25 slopes downward and outward.
A forward cam surface 27 formed in a conical shape on the inner circumferential surface of an annular forward cam body 26 is fitted onto each of the forward inclined surfaces 25 .

Forward cam body 2 having this forward cam surface 27
6, the cam body 26 is forcibly pushed down by a plurality of push-down portions 32 attached to an upper mold 31 which is pushed down by a press. A shaft 34 of a presser plate 33 that presses the upper surface of the workpiece 14 is fitted into the upper mold 31 so as to be able to move vertically, and the presser plate 33 is urged downward by a coil spring 35.

Further, a retraction return means is provided for the slider 22. This retraction return means has a convex portion 41 protruding downward from the outer end of each of the sliders 22, a retraction inclined surface 42 is provided on the inner surface of each of the convex portions 41, and each of the inclined surfaces 42 includes: Above slide holder 1
A retraction cam surface 44 formed in a conical shape is fitted to the upper outer peripheral surface of an annular retraction cam body 43 that is vertically movably fitted to the outer peripheral surface of the retraction cam body 43.
A plurality of guide pins 45 integrated therewith are fitted into the table 11 so as to be movable up and down to guide the vertical movement of the cam body 43, and a plurality of guide pins 45 provided on the lower surface of the cam body 43 and in the hole 47 of the table 11 are fitted to the table 11 so as to be vertically movable. A plurality of compression coil springs 49 are interposed between the screw 48 and the cam body 43 to push the cam body 43 upward.

Then, when the upper die 31 is pushed down by a press, the press plate 33 presses and fixes the upper surface of the workpiece 14, and the push-down part 32 moves the forward cam body 2
Press down on 6.

As a result, the conical cam surface 27 of the forward cam body 26 is aligned with the forward slope surface 27 of each slider 22.
5, each slider 22 moves forward to the center at the same time, and the punch 23 punches a hole in the workpiece 14. At that time, the punched pieces fall below the table 11 through the pit hole 18.

Note that the backward cam body 43 is lowered simultaneously with the lowering of the forward cam body 26 and gradually separates from the slider 22, so that the slider 22 moves forward.

In addition, by raising the upper die 31 and releasing the push-down part 32 from the advancing cam body 26, the push-down part 32 is moved back by the repulsive force of a member having an urging force less than the push-down force of the push-down part, such as the compression coil spring 49. The cam body 43 rises, and the conical cam surface 44 of the cam body 43 presses the retreating inclined surface 42 of each slider 22, so that each slider 22 simultaneously retreats outward and returns.

As described above, according to the present invention, a plurality of slide grooves are provided radially in the annular slide holder, a slider is provided in each of the slide grooves, and the forward slope surface provided at the outer end of each slider is provided with a slider. Since the conical advancing cam surface is fitted onto the inner circumferential surface of the annular advancing cam body, even when drilling from four or more directions, the drilling positions are close to each other. Even if the slide holder and the advancing cam body do not increase in size or change in size, a large number of sliders can be set at any position on the annular slide holder within the range where the slide groove can be formed.
The annular advancing cam body can drill multiple holes at once. Moreover, the tilting of the backward cam body pushes out the sloped surface of the slider from below due to the action of the biasing member, so that the slider can be smoothly moved backward.
In this way, the drilling device of the present invention can drill a significantly larger number of side holes in one process than conventional ones, and even if the number of holes to be drilled increases, the number of holders and cams does not need to be increased. There is no major cost increase, and the entire device can be made more compact.
Since it has a simple structure and is easy to manufacture, it is cheaper than conventional ones. Further, there is no need to provide a protruding cam corresponding to each slider on the upper mold as in the conventional method, resulting in high safety.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional drilling device, FIG. 2 is a plan view showing an embodiment of the drilling device of the present invention, and FIG. 3 is a sectional view thereof. 12...Slide holder, 13...Drilling die, 14...Workpiece, 15...Surrounding side part, 16...
Hole, 21...Slide groove, 22...Slider, 2
3... Hole punch, 25... Inclined surface for forward movement, 2
6...Advance cam body, 27...Advance cam surface, 3
2... Push-down portion, 43... Retraction cam body of the retraction return means.

Claims (1)

[Scope of utility model registration request] A hole-making die is provided in the center of the annular slider holder by making multiple holes on the circumferential side where the workpiece is fitted, and a plurality of slide grooves are formed radially in the slider holder around this hole-making die. A slider is slidably fitted into this slide groove, a hole punch is provided at the inner end of the slider facing the hole of the hole punching die, and at the outer end of each slider, A forward slope surface that slopes outwardly toward the bottom is provided, and a conical forward cam surface is fitted onto the inner peripheral surface of the annular forward cam body on each of the forward slope surfaces. A push-down portion for forcibly pushing down the forward cam body is disposed above the forward cam body having the forward cam surface, and a push-down portion is provided on the inner wall of the outer end of each of the sliders in a downward direction. Provided with outwardly inclined retreating ramps, each of the retreating ramps having a
A conical-shaped retraction cam body is fitted, and the upper surface of its outer end is brought into contact with the lower end surface of the outer end of the slider and the lower end surface of the outer end of the forward movement cam body by vertical movement of the retraction cam body. A hole punching device, characterized in that a member is provided which is capable of moving toward and away from the retracting cam body and urges the retreating cam body from below with a force less than the pressing force of the pressing portion.