JPH0120018Y2 - - Google Patents

Description

[Detailed description of the invention] a. Field of industrial application The invention relates to punching dies, and more specifically, it is a punching die used in presses that allows for easy alignment of the punch and die with high precision. This relates to a punching die in which the punch, which is the die, is a tight fit and moves by rolling friction.

b. Prior Art In conventional punching dies, the punch, which is a movable die, is guided by a punch guide or plate holder to approach and move away from the die, which is a fixed die, to perform the punching operation. It moved by sliding movement.

c. Problems that the invention aims to solve With the above-mentioned conventional technology, a lot of time is spent on centering the punch and die, and in the case of small-diameter punches, the bending during machining also adds heat to the tool, causing the tool to break. There were problems such as a short lifespan.

d Means to solve the problem In this invention, the above-mentioned sliding movement is changed to rolling movement, the loose fit of the guide part is changed to a tight fit, and the reverse plate holder is buried below the die surface to facilitate centering. They realized a device that did this.

e. Effect The sliding movement was changed to rolling movement to prevent heat generation, the loose fit was changed to a tight fit to improve centering accuracy, and the punch was engaged with the reverse plate holder to facilitate centering.

f Embodiment The punching die 1 according to the embodiment of the present invention shown in FIG. 1 is divided into a punch 3 and a die 5, each of which is attached to a punch holder 7 and a die holder 9 and held in a separated state. .

The punch holder 7 and die holder 9 described above are
It can also refer to the upper and lower rotating plates of a turret punch press, or the upper and lower arms of a mold holder that holds a pair of punches and dies called swan necks.

A workpiece W is positioned above the die 5, and a striker 13 attached to the ram of the press is provided above the head 11 of the punch 3 so as to be movable up and down.

The punch 3 is composed of a punch body 15, a strip spring 17, a plate holding cylinder 19, and the like.

The punch body 15 has a small diameter part from the middle upward, into which a spring washer 21 is inserted, and a strip spring 17 is inserted between it and the punch head 11 described above.
is compressed and retained.

A disk-shaped flange plate 23 is provided at the upper end of the plate holding cylinder 19, and is biased upward by lift springs 25 provided at multiple locations on the upper surface of the punch holder 7, and is guided by a guide bolt 27 to move up and down. It rests on a flexible support ring 29.

A tubular slide bush 31 is fitted in the portion where the punch 3 passes through the punch holder 7, and a so-called stroke bearing 33 is provided between the plate holding cylinder 19 and the slide bush 31.

In addition, the punch main body 15 and plate presser cylinder 19 described above
A stroke bearing 35 is also provided between. The so-called stroke bearings 33 and 35 are bearings that are generally placed between a cylinder and a shaft, in which balls contact the inner surface of the cylinder and the outer surface of the shaft, rolling primarily in the thrust direction and causing friction between the two. This is the name given to the bearing that allows relative movement.

In this case, the ball retainer moves in the thrust direction by a distance that is half the relative movement amount.

Next, the main parts of the die 5 are a die body 37 and a fixing device 39 for fixing the die body 37 to the die holder 9.
A reverse plate presser 43 is provided which enters the hole under pressure from the bullet 41.

A part of the die holder 9 below the above-mentioned reverse plate holder 43 is screwed together with the reverse plate holder 43, and the reverse plate holder 43 is pulled downward against the urging force of the bullet machine 41, and the die body 37 is pulled out. A threaded tensioning device 45 is provided which is buried from the top surface of the device.

As is clear from the embodiments described in detail above, the punching die embodying the technical idea of the present invention is guided in vertical movement by a so-called stroke bearing based on an interference fit.

Therefore, no heat is generated during the ascent and descent, and the effect is obtained that the alignment of the mind is not disturbed.

Furthermore, by screwing and pulling the reverse plate holder so that it is buried in the upper surface of the punched hole of the die, it is possible to easily align the punch and die after polishing.

g. Effects of the invention As can be understood from the explanation of the examples above, the gist of this invention is basically as stated in the claims for utility model registration. As is clear from the description, in the present invention, the punch holder 7
The slide bush 31 and the plate holder cylinder 19 and the plate holder cylinder 19 and the punch body 15, which are provided integrally with each other, are fitted with an interference fit through stroke bearings, respectively. be.
Therefore, between the slide bush 31 and the plate holding cylinder 19 and between the plate holding cylinder 19 and the punch body 1.
5, there is a gap of 0, and the punch body 15 does not wobble even slightly.

In addition, in the die body 37, the punch body 15
A reverse plate holder 43 is provided in a freely engageable pull-out hole so as to be movable up and down, and a tension device 45 is provided for holding the reverse plate holder 43 in a buried state in the pull-out hole against an urging force. Since it is a punch body 1
5 and the die body 37, the punch body 15 can be engaged in the punched hole of the die body 37, and the alignment can be performed with high precision.As a result, the punching process of the plate material can be performed easily. This can be done with high precision.

Note that this invention is not limited to the embodiments described above, but can be implemented in other embodiments by making appropriate changes.

[Brief explanation of the drawing]

FIG. 1 is a vertical central sectional view of an embodiment of the punching die of the present invention. Explanation of the symbols representing the main parts of the drawings: 1...Punching die, 15...Punch body, 19...Plate holding cylinder, 31...Slide bush, 33...Outer stroke bearing, 35...Inner stroke Bearing, 37...Die body, 43...Reverse plate presser, 45...Threaded tension device.

Claims (1)

[Scope of utility model registration request] A plate holding cylinder 19 is provided in a tubular slide bush 31 integrally attached to the punch holder 7 so as to be movable up and down with a tight fit through a stroke bearing 33. The punch body 15 is provided with a stroke bearing 35 so as to be movable up and down with a tight fit, and the die body 3 with which the punch body 15 can freely engage is provided.
A reverse plate presser 43 is provided in the punch hole 7 facing the punch body 15 so as to be movable up and down and biased upward.
A precision punching die characterized in that it is provided with a tension device 45 for holding the die 3 in a buried state.