JPS6149049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic centering device for dies such as peeling dies, drawing dies, and rolling dies.

Conventionally, for example, in the case of a peeling die, a peeler equipped with a guide is installed in front of a fixed peeling die, and the surface condition of the metal bar etc. after cutting is checked so that the surface layer is evenly cut. A method is used in which cutting is performed while adjusting the guide in consideration of the balance of the size of the powder. However, aligning the front guide and the peeling die is time-consuming due to errors in parts manufacturing and assembly, and even if such alignment is performed, it is difficult to cut the surface evenly. It's difficult. In order to avoid this, a method as shown in FIG. 1a has been proposed (Kokoku No. 44-26396). This is the front guide 1
9 and the rear drawing die 17 is a support stand 18.
A plurality of bolts 20 for correcting the inclination of the center of the peeling die 4 are screwed into the support base 18 in a circular manner, and a steel ball 21 is provided at the tip of the bolt 20 so as to be able to roll freely. 21 is brought into contact with the holder 22 of the stripping die 4 to support the holder 22 in an immovable state, and the stripping die 4 can be freely displaced in a direction perpendicular to the longitudinal direction of the wire 16 to perform a self-centering action. This is what I did. However, this peeling machine has the following problems. In this seed peeling machine, a straightening machine is usually provided behind the drawing die 17, and the wire rod 16 is straightened by straightening the wire rod 16.
However, it is difficult to straighten even minute bends with a straightening machine, and even after passing through the drawing die 17, slight bends remain, and during stripping, the core is inserted between the stripping die 4 and the wire 16. Misalignment occurs. In the above method, the die holder 22 is immovably supported by the steel ball 21 provided at the tip of the bolt 20, and the stripping die 4 is made freely displaceable in a direction perpendicular to the longitudinal direction of the wire, thereby automatically adjusting the center misalignment described above. However, in this method, the tip of the metal steel ball 21 is brought into contact with the die holder 22 and mechanically slidably supported, so automatic alignment that follows fine misalignment is difficult. In addition, due to sliding, the contact part wears out and automatic sliding is inhibited, making alignment increasingly difficult, and there is a high risk of uneven skin peeling as shown in Figure 1b, making it impossible to continue the work. There is even a fear that it will happen. In FIG. 1b, x and x' are the wire rod 16, and O and O' are the stripping die 4.
, respectively, are the central axes. As is well known, the purpose of stripping is to maintain the roundness of the wire and remove surface flaws and decarburized layers on the surface layer of the wire by shaving off the surface layer of the wire to a certain thickness over the entire circumference. Therefore, even if it is not impossible to continue the work, the purpose of skinning cannot be achieved if one side is scraped off unnecessarily deeply and the circumference on the other side is hardly scraped off. .

The present invention has been made in order to eliminate the deficiencies of the conventional alignment devices of this type.

The present invention will be explained in accordance with the embodiment shown in FIGS. 2 and 3 using a peeling die as an example. In FIG. 2, reference numeral 1 indicates a hollow dice stand. 2 is a hollow die holder, and a peeling die 4 is attached to the inner periphery of the die holder 2. A dice stand 1 is provided in front of a dice holder 2 at a predetermined distance. As is well known, the inner circumference of the peeling die 4 is set so that its diameter gradually increases in the direction a. The hollow part of the die stand 1 and the hollow part of the die holder 2 are in communication with each other, and an annular groove 61 having a different radius around the axis of the die holder 2 is formed on a predetermined surface of the die stand 1 facing the die holder 2. 71 is formed, and annular O-rings 6 and 7 are fitted into the annular grooves 61 and 71, one of the O-rings 6 and 7 is connected to the annular grooves 61 and 71, and the other is connected to the annular grooves 61 and 71. It protrudes from 71 and is in contact with the opposing surface of the opposing die holder 2. In other words, the opposing surfaces of the die stand 1 and the die holder 2 that are perpendicular to the feed direction of the wire rod 16 are separated by a predetermined distance and are opposed to each other, and the parts where the O-rings 6 and 7 are installed are sealed through them. becomes. A space formed by the O-rings 6 and 7 and the facing surfaces of the die stand 1 and the die holder 2 between them is a hydraulic chamber 8 that is connected to the port 10. 12 is a plug for the port 10, and 11 is a plug for an air vent passage connected to the hydraulic chamber 8. 3 is a ring with an L-shaped cross section,
The right inner periphery is screwed to the left outer periphery of the die stand 1. An annular O-ring 15 is fitted into a predetermined position inside the left periphery 31 of the ring 3, and supports the die holder 2 on the left side.

In such a configuration, when attempting to strip a metal wire or metal rod according to the present invention, the plug 12 is removed, the hydraulic chamber 8 is sufficiently lubricated through the port 10, and then the port 10 is closed with the plug 12. do. At this time, the plug 11 is removed to vent the air. By inserting a metal wire or a metal rod into the left inner periphery of the peeling die 4 and pulling it in the direction a, the peeling die 4 and the die holder 2 connected thereto as one body are pressed to the right by the cutting load. and O
A force acts to deform the rings 6 and 7, and the pressure in the hydraulic chamber increases. In this way, the O-rings 6, 7
In addition to increasing the sealing effect, the die holder 2 is supported by fluid, but because the fluid is supported through the O-rings 6 and 7, the die holder 2 is supported by fluid in the vertical and horizontal directions despite the presence of a large cutting load. Small load differences are automatically recognized; if the upward load on the skinning die is greater than the downward load, the peeling die will be displaced upward by an amount corresponding to the load difference.

This point will be further explained in detail with reference to FIGS. 1b and 3.

As shown in FIG. 1b, if misalignment occurs between the wire rod 16 and the peeling die 4 during stripping, the contact portion of the cutting edge that has deeply bitten into the wire rod 16 with the wire rod 16 is designated as A, and the portion of the cutting edge on the opposite side is If the contact area between the shallow cutting edge and the wire 16 is A', then the cutting resistance R is the combined force of the forward resistance Fc and the perpendicular resistance Ft against the peeling die 4 during peeling.
However, the balance is lost at points A and A', and the die holder 2 presses the upper O-ring 6 in FIG. 2 with a stronger force than the O-ring 7. As a result, the distance between the facing surfaces of the die stand 1 and the die holder 2, which are close to the O-ring 6, becomes narrower, and the oil pressure in the oil pressure chamber 8 increases. However, since there is no escape for the increased oil pressure, the reaction force of the increased oil pressure acts to return the die holder 2 to its original state.
A self-adjusting action acts on the peeling die 4 so that the cutting resistance R decreases in each circumferential direction, that is, it stabilizes by maintaining a uniform cutting resistance balance all around. Since the holder 2 is supported in a floating state in the hydraulic chamber 8, the die holder 2 follows the slight bend without any resistance to the above-mentioned self-adjustment action, and the axis of the stripping die 4 immediately aligns with the axis of the wire 16. Returns to the alignment state with. The same holds true when there is a difference in the loads acting on the peeling die to the left and to the right. In this way, the peeling die is always moved so that the same cutting load is applied in both the vertical and horizontal directions. The fact that the cutting loads on the top, bottom, left and right sides are the same means that automatic center adjustment is performed, and therefore uniform cutting is performed over the circumference of the metal rod. That is,
By liquid-supporting the die holder 2 with two O-rings having different diameters as annular bodies, automatic centering of the peeling die, which has never been seen before, becomes possible.

In the present invention, the force required for cutting is expressed as the resistance to the tensile force of the metal rod, and this resistance can be understood as a change in pressure in the hydraulic chamber, so
There is an advantage in that the cutting resistance can be determined by connecting the hydraulic pressure gauge 14 to the hydraulic port 10 to measure the hydraulic pressure in the hydraulic chamber 8 and multiplying it by the area of the hydraulic chamber.

Since the present invention hydraulically supports the die holder, unlike conventional steel ball supported ones, it is possible to identify even the slightest misalignment and automatically align the die holder. Excellent effects can be achieved without causing any wear or the like.

Although the above embodiments have been described using a peeling die as an example, the present invention is not limited thereto, and can also be applied to dies such as drawing dies and rolling dies. The effect of core alignment can be contained.

[Brief explanation of the drawing]

FIG. 1a is a vertical cross-sectional view showing a conventional alignment device for a peeling machine, FIG. 1b is a vertical cross-sectional view showing the state of alignment between the peeling die and the wire during peeling, and FIG. FIG. 3 is an enlarged partial vertical cross-sectional view for explaining the action of the present invention at the time of misalignment. 1... Dice stand, 2... Dice holder, 3... L-shaped ring, 4... Peeling die, 6,
7,15...O ring, 8...Fluid pressure chamber, 61,7
1...Annular groove.

Claims (1)

[Claims] 1. A hollow die stand with a hollow part communicating with the hollow part of the die holder is provided at a predetermined distance in front of a hollow die holder with a die attached to the inner periphery of the hollow part, and a cross section L is provided at the rear of the die holder. A mold ring is provided, the L-shaped ring side of the die stand and the die stand side of the L-shaped ring are connected, and an O-ring is inserted into the opposing surface of the die holder and the L-shaped ring, and the Two annular grooves with different radii centered on the axis of the die holder are formed on a predetermined surface of the die stand facing the die holder, an O-ring is attached to each of the two annular grooves, and one side is attached to the annular groove, The other side is fitted so as to be in contact with the opposing surface of the die holder facing the annular groove, and the space formed by the two O-rings and the opposing surfaces of the die stand and the die holder between them is communicated with the port to provide hydraulic pressure. An automatic centering device for dies consisting of a chamber.