JPS58138528A - Punching machine of metallic disk - Google Patents

Abstract

PURPOSE:To obtain a titled machine for punching a hole of high accuracy, whose inside and outside diameters are of the same axis, in the center of a metallic disk manufactured by free upsetting, by fitting a holder into a die concentrically, making each of them have a moving mechanism independently in the axial direction, and providing a guide part of the metallic disk outside circumference formed like a reverse-circular truncated cone, on the inside circumference of the holder. CONSTITUTION:In a state that a metallic disk 13 by free upsetting is placed on a die 4, a press working punch 1 is lowered, and the disk 13 is pushed up together with the die 4. In this case, as for the disk 13, a barrel-like part 13A of its outside circumference is hit against a reverse-circular truncated conical part 7A of the inside circumference of a holder 7 and is pushed, it moves on the die 4, and is positioned almost concentrically with the die 4. Subsequently, the punch 1 is further lowered, is lowered together with the die 4 under holding the disk 13 by the holder 7, and at the point of time when the die 4 is brought into contact with a hard plate 10, shear-working is started by the punch 1 and the die 4, a hole is punched, and a hollow base material 14A is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal disk punching apparatus, particularly a metal disk punched into a flat plate shape by a die held in a holder and a press punch. This invention relates to a device for punching a hole in the center of a metal disk that has been upholstered and processed.

When punching a hole in the center of a metal disk processed into a flat plate shape, when upsetting the periphery with restraint, the outer periphery after upsetting will be almost straight, so Punching can be performed using a fixed die and punch, but in the case of free upsetting that does not constrain the surroundings, the outer circumference after upsetting is barrel-shaped, and the maximum outer diameter may vary. It is difficult to punch out based on the outer circumference, so cutting with a drill or the like has been a common processing method. For this reason, punching of such a metal disk has the drawbacks of requiring a large number of processing steps, slow processing speed, and high cost.

The present invention eliminates these problems and provides a punching device that can quickly and easily punch a hole with high coaxial accuracy in the inner and outer diameters in the center of a metal disk made by free upsetting. A device for punching a hole in the center of a flat metal disk using a die held in a holder and a press punch, in which the holder is fitted concentrically to the die. The holder has a mechanism for moving the holder in the axial direction independently of each other, and is characterized in that the inner periphery of the holder is provided with a guide part in the shape of an inverted truncated cone for guiding the outer periphery of the metal disc.

That is, in the present invention, the die and the holder are each provided with a function of being able to move in the axial direction, and an inverted truncated conical guide portion is provided on the inner circumference of the holder to guide the barrel-shaped outer circumference of the metal disk. This makes it possible to easily align the center of a metal disk processed by free upsetting and perform punching, making it possible to obtain a hollow material with high coaxial accuracy of the inner and outer diameters. It is something that makes you feel good.

Examples will be described below.

FIG. 1 schematically shows the mold structure of one embodiment, showing the state before punching (left half) and after punching (right half). In the figure, 1 is a punch for press work attached to a punch holder 2, 3 is a fixed stopper, 4 is a die floating by a spring 6 via a cushion pin 15, and 7 is fitted concentrically to the die 3. , whose inner periphery is in the shape of an inverted truncated cone, is a holder which is floated by a spring 9 via a cushion pin 8 independently of the die 3, and 10.11 and 12 are respectively /1-dove plates,
In the die holder and holder guide, 13 indicates a metal disk placed on the die 4, and 14 indicates a hollow material after punching.

Next, a nine punching process using the punching apparatus of the embodiment will be described with reference to FIGS. 2, 3, and 4. In both figures, the same parts as in Figure 1 are given the same reference numerals. FIG. 2 shows a state in which the free upsetting metal disk 13 is placed on the die 4. In this state, the top surface of the die 4 and the top surface of the holder 7 are almost on the same plane, and the metal disk 13 is placed on the die 4. 13 is in a floating state. When the press working bond 1 is lowered in this state, the metal disk 13 is inserted into the die 4.
and is pushed down. At this time, the metal disc 13
Even if it is not concentric with the die 4 as shown in the figure, the metal disk 13 is positioned almost concentrically with the outer circumference of the die 4. At this time, since the spring 9 is stronger than the spring 6, the holder 7 hardly descends, and only the metal disc 13 and the die 4 descend, and the metal disc 1
Correction of position 3 is performed. Therefore, when placing the metal disk 13 on the die 4, the metal disk 13 does not have to be in a concentric position with the die 4.

When the press working punch 1 is further lowered in the state shown in FIG.
When the die 4 comes into contact with the hard plate 10, the press working figures 5, 6, and 7 are as follows.
This figure shows the deformation state of the metal material when a freely upturned metal disk is processed by the punching device of the embodiment, where 15 is a metal bar-shaped piece obtained by cutting the raw material, and 13 is a metal bar-shaped piece 15. This is a metal disk manufactured by free upsetting, and the outer periphery has a barrel-like natural shape with an outer periphery barrel-shaped portion 13A. Reference numeral 14 indicates a hollow material in which a punch hole 14B is punched in the center of the dowel by the apparatus of the embodiment, and 14A indicates a blank.

When a metal disk is punched by the punching apparatus of this embodiment, a hollow material with high coaxial accuracy of inner and outer diameters can be easily and reliably provided.

Furthermore, compared to conventional cutting operations, the number of machining steps can be reduced, the machining speed can be increased 3 to 5 times, and component costs can be reduced.

As described above, the present invention provides a metal disk punching apparatus that can quickly and easily punch a hole with high coaxial accuracy of inner and outer diameters in the center of a metal disk made by free upsetting process d1. This makes it possible to achieve this goal and has great industrial effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the state of the mold structure before and after punching in an embodiment of the metal disk punching apparatus of the present invention, and FIGS. 2, 3, and 4 are FIG. 1 is a sectional view showing the state of the mold structure in different processes when the punching apparatus of the embodiment shown in FIG. 1 is used, and FIGS. FIG. 2 is a perspective view showing a process in which a hollow material is formed from a metal bar using the punching device of FIG. DESCRIPTION OF SYMBOLS 1...Punch for press processing, 2...Punch holder, 3...Fixed stopper, 4...Dice, 5...Cushion pin, 6...Spring, 7...Holder, 7
A... Inverted truncated conical part, 8... Cushion pin, 9...
...Spring, 10...Hard plate, 11...
・Dice holder, 12...Holder guide, 1.3
...Metal disk, 13A...Outer barrel-shaped part, 14...
・(After punching); fJtlEJ sugar 2 mouth 3 n 1A 4 (g

Claims (1)

[Claims] 1. In an apparatus for punching a hole in the center of a metal disc processed into a flat plate shape using a die held in a holder and a press punch, the holder is arranged concentrically with the die. A metal member which is fitted into the holder and has a mechanism for moving in the axial direction in the respective directions, and an inverted truncated conical guide portion is provided on the inner periphery of the holder to guide the outer periphery of the metal disc. Disc punching equipment. 2. The mechanism that moves independently in the axial direction is comprised of springs that independently support the holder and the die, and the spring that supports the holder is stronger than the spring that supports the die. A metal disk punching device according to claim 1.