JPH0474095B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for drilling a ring-shaped metal fitting and an apparatus therefor for drilling a through-hole throughout the thickness and width of the ring-shaped metal fitting.

Prior Art The ring-shaped metal fitting A has an annular shape as shown in Figs. 3 and 4, and has an outer diameter of 24 mm, an inner diameter of 10 mm, and
The wall thickness is 5 mm, and the ring-shaped portion has a width of 7 mm.

As shown in FIG. 5, this ring-shaped metal fitting A has a mechanism in which a nut N that fixes an appropriate sliding member is screwed onto a spiral body S, and the nut N is arbitrarily slid by rotating the spiral body S in forward and reverse directions. , is fixed to a predetermined position such as at both ends of the spiral body S with a pin P, and acts as a stopper for regulating the sliding range of the nut N.

For this reason, the ring-shaped metal fitting A mentioned above is
A through-hole H with a diameter of 3 mm for inserting the pin P is bored in the thickness width of mm.

In the past, however, the drilling operation for drilling the through hole H with a width of 3 mm in the 5 mm thickness of the ring-shaped metal fitting A was performed manually using a drill using a drill press.

Problems to be solved by the invention As mentioned above, the conventional drilling work for ring-shaped metal fittings was done manually using a drill press, and furthermore, it required work after deburring, making it extremely difficult to work. It is a bad thing.

From this point of view, it is desired to mechanize the above-mentioned drilling work for the ring-shaped metal fitting using a press machine to improve work efficiency.

However, if a press machine is used to first drill a through hole with a diameter of 3 mm, which is approximately the full width of the thickness, in a thickness of 5 mm, the periphery of the through hole will bulge outward due to the press pressure. This method distorts and deforms the ring-shaped metal fitting, damaging its form.Secondly, when punching through holes at both corresponding diameter locations in a ring-shaped part with an outer diameter of 24 mm and an inner diameter of 10 mm and a width of 7 mm, It is extremely difficult to mechanize the drilling work of this type of ring-shaped metal fittings using a press machine because it is difficult to discharge and dispose of the waste generated by punching the holes, and it has not been realized.

The present invention was devised to solve the above-mentioned problems, and it is possible to use a press machine to perforate this kind of ring-shaped metal fittings for which it is difficult to perform the perforation process using a press machine. It is an object of the present invention to provide a method of drilling a ring-shaped metal fitting and an apparatus therefor, which can realize the work.

Means for Solving the Problems The method of perforating a ring-shaped metal fitting according to the first invention involves strongly pressing the entire surface of a ring-shaped metal fitting A, which is a workpiece, onto a die 1 having a discharge hole 3 with a pressing block 4. The cam slopes 15 and 16 formed by shifting the pair of left and right master cam rods 11 and 12, which are moved downward by the press plate 8 that presses them in a fixed state, create a corresponding pair of left and right follower blocks. 1
3 and 14 in opposite directions with a time difference, and punch a hole from the outer circumferential end surface of the ring-shaped metal fitting A toward the inner circumferential end surface using the respective punches 17 and 18 protruding from both follower blocks 13 and 14. It is characterized by having a hole H formed therein.

Further, the ring-shaped metal fitting punching device of the second invention has the following features:
A device for carrying out the drilling method of the first invention, which is a press operated by hydraulic pressure to forcefully press and hold the entire surface of a ring-shaped metal fitting A, which is a workpiece, against a die 1 having a discharge hole 3. A block 4 is provided, and a pair of left and right master cam rods 11 and 12 that are moved downward by a pressing press plate 8 are mutually staggered to form cam slopes 15 and 16, and a corresponding pair of left and right follower blocks 13 are provided. , 14 with each punch 17, 1
8 is provided in a protruding manner.

Operation: The pressing press plate 8 lowers the left and right pair of cam rods 11 and 12, thereby causing the cam slopes 15 and 16 formed by causing the two cam rods 11 and 12 to be offset, respectively. , a pair of opposing follower blocks 13 and 14 are advanced with a time difference. Then, each of the punches 17 and 18 protruding from both follower blocks 13 and 14 presses the ring-shaped metal fitting A, which is a workpiece that is strongly pressed against the die 1 with a time difference, into its thick outer periphery. A through hole H is formed by punching a radius from the end surface toward the inner peripheral end surface toward the center.

Here, the length of the waste generated when the left and right punches 17, 18 punch a hole is reduced by about 60% by cold pressing, and at the same time, the left and right punches 17, 18 are punched with a time difference. Since they do not collide with each other during punching, they fall smoothly one after another from the discharge hole 3 of the die 1 and are discharged to the outside.

In addition, since the entire surface of the ring-shaped metal fitting A is strongly pressed and fixed on the die 1 with a pressing block 4, the through-hole
The surrounding area does not bulge outward, and the swelling is forcibly suppressed.

Thereby, a burr-free through hole H can be smoothly formed in the full thickness and width of the ring-shaped metal fitting A using a press machine without damaging the form of the ring-shaped metal fitting.

EXAMPLE Hereinafter, the apparatus and method used in the present invention will be explained according to the examples shown in FIGS. 1 and 2.

In FIGS. 1 and 2, 1 is a die provided at the center of a board 2, and a discharge hole 3 is formed in the center of the die. 4 is a die 1 for the entire surface of the ring-shaped metal fitting A shown in FIGS. 3 and 4, which is the workpiece.
As shown in FIG. 2, the support arm 5 of the press block 4 is pivotally supported by a fulcrum 6, and is supported by the expansion and contraction movement of a hydraulic plunger 7 connected to its rear end. Therefore, the press block 4 is configured to be rotated up and down. Reference numeral 8 denotes a press plate that applies pressure, and presses a pair of left and right original cam rods 1 with or without spacers 9 and 10.
1 and 12 are fixed vertically. Cam slopes 15 and 16 that contact the left and right pair of follower blocks 13 and 14
However, the cam slopes 15 and 16 are formed on the left and right master cam rods 11 and 12 so as to be different from each other, and are different from each other on the left and right slave blocks 1.
3 and 14 are configured to advance toward each other with a time difference. And both left and right follower blocks 1
Punches 17 and 18 are provided protruding from the front surface of each of 3 and 14. Reference numeral 19 is a compressed air passageway for facilitating the removal of the ring-shaped fitting A drilled from above the die 1.

The working order is to place the ring-shaped metal fitting A, which is the workpiece, on the die 1, and then rotate and lower the hydraulically operated press block 4 to firmly press and hold the entire surface of the ring-shaped metal fitting A on the die 1. keep it in a tight condition. Thereafter, when the press plate 8 is pressurized and lowered from the state shown by the two-dot chain line in FIG. Since the cam slopes 15 and 16 are inconsistent with each other, the corresponding pair of left and right follower blocks 13 and 14 are such that one follower block 13 is momentarily earlier than the other follower block 14 due to the time difference. With , both sides advance from the two-dot chain line state to the solid line state. As a result, each of the punches 17 and 18 protruding from both follower blocks 13 and 14 center the ring-shaped metal fitting A at a radius from its thick outer peripheral end surface to its inner peripheral end surface with a time difference. Drill a hole in the direction.

Here, the length of the waste generated when the left and right punches 17, 18 punch a hole is reduced by about 60% by cold pressing, and at the same time, the left and right punches 17, 18 are punched with a time difference. They do not collide with each other during punching, and can smoothly fall one after another from the discharge hole 3 in the center of the die 1 and be discharged to the outside.

In addition, since the entire surface of the ring-shaped fitting A is strongly pressed and fixed on the die 1 with the press block 4, the periphery of the through-hole H in the ring-shaped fitting A subjected to the press pressure during hole punching is It is possible to forcibly suppress swelling deformation of the portion without bulging outward.

Thereby, a burr-free through hole H can be smoothly drilled throughout the thickness and width of the ring-shaped metal fitting A while maintaining the original shape of the ring-shaped metal fitting A.

After completing this drilling work, the press plate 8 is moved to the first
The original cam rod 11 is returned to the state shown by the two-dot chain line in the figure.
12 is moved upward, and the follower blocks 13 and 14 are moved back using air pressure or a spring, etc. At the same time, the press block 4 is moved upward and rotated to form a perforated ring-shaped metal fitting A with a through hole H formed therein. Aisle 19
It is taken out from above the die 1 by blowing out compressed air from the die 1, and the above operation is repeated.

Effects of the Invention As explained above, the present invention makes it possible to use a press machine to drill a through hole of the full thickness of a ring-shaped metal fitting. In comparison, the labor and time required for drilling work can be significantly reduced, and finishing work such as deburring after drilling work is no longer required, which has the excellent effect of greatly improving work efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway front view, FIG. 2 is a partially cutaway side view, FIG. 3 is a front view of a ring-shaped metal fitting, and FIG. 4 is a plan view thereof. FIG. 5 is an explanatory diagram illustrating the usage state of the ring-shaped metal fitting. 1... Dice, 3... Discharge hole, 4... Pressing block, 8... Press plate, 11, 12... Original cam rod, 13, 14... Follower block, 15, 16...
...Cam slope, 17, 18... Punch, A... Ring-shaped metal fitting, H... Through hole.

Claims (1)

[Scope of Claims] 1. The entire surface of the ring-shaped metal fitting A, which is the workpiece, is firmly pressed onto the die 1 having the discharge hole 3 by a press block 4, and then pressed by a press plate 8 that applies pressure. A pair of left and right cam rods that move downward 1
Cam slope 1 formed by interlocking 1 and 12, respectively.
5 and 16, the corresponding pair of left and right follower blocks 13 and 14 are advanced toward each other with a time difference, and the ring-shaped metal fittings A are punched with respective punches 17 and 18 protruding from both follower blocks 13 and 14. A method for drilling a ring-shaped metal fitting, which comprises punching a through hole H from an outer peripheral end surface to an inner peripheral end surface. 2 A pressing block 4 is provided to forcefully press and hold the entire surface of the ring-shaped metal fitting A, which is the workpiece, on the die 1 having the discharge hole 3, and a pair of left and right master blocks are moved downward by the pressing press plate 8. Cam rod 11,
A drilling device for a ring-shaped metal fitting, characterized in that cam slopes 15 and 16 are formed by mutually staggered cam slopes 15 and 16, and punches 17 and 18 are respectively protruded from a pair of left and right follower blocks 13 and 14 corresponding to the cam slopes 15 and 16. .