JP3101231B2 - Upper die for punch press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper die used for a punch press such as a turret punch press and, more particularly, to an upper die for a punch press having a jet port for jetting a fluid such as air or oil mist downward. Regarding the mold.

[0002]

2. Description of the Related Art Conventionally, an upper die used for a punch press such as a turret punch press is an upper die holder (in the case of a turret punch press, the upper turret corresponds to the upper die).
The punch body is vertically movably fitted into a cylindrical punch guide supported vertically. A powerful stripper spring is mounted between a punch head and a punch guide screwed to the upper end of the punch body.

When punching is performed on a sheet material by cooperation of an upper die and a lower die (die) having the above-described configuration, the punched piece sometimes floats following the rising of the punch body and falls downward. May not.

Therefore, in order to solve the above-mentioned problem, for example, as disclosed in Japanese Utility Model Laid-Open No. 11622/1990, an appropriate number of air ejection holes are provided on the lower end surface of the punch body or on the outer periphery of the lower end surface. There is known an upper die which forcibly drops a punched piece downward by air blown out from the air blowout hole after the punching process.

In the case of supplying air to the upper mold having the above structure, a supply port is provided on the lower surface of the striker for pressing the upper mold, and a connection port for connecting to the supply port is provided on the upper surface of the upper mold. It has a configuration. However, the punch head of the upper die screwed to the upper end of the punch body is provided with a tapered portion so that the screw portion tends to be tightened by the action of the stripper spring, and has a radial direction so as to be easily deformed. A slit is provided.

In the above-described configuration, when the lower surface of the striker contacts the upper surface of the punch body to supply air from the supply port to the connection port, the lower surface of the striker and the punch head are connected to each other. There is a problem in that air leaks from the slit and from the slit, and the loss of air is large. In view of this, the central portion of the upper surface of the punch head 101 as shown in, for example, FIG. 6 to FIG. An opening having a diameter larger than that of the screw hole 103 is provided above the screw hole 103 formed at the center of the ring member.
To 105C, and the sealing members 105A to 105C
An upper die having a configuration in which the upper portion is provided substantially equal to the height of the upper surface of the punch head 101 has been developed.

FIG. 6A shows a configuration in which an annular seal member 105A is attached to an enlarged opening formed at the upper end of the punch body 107, and FIG.
8A and 8B, a ring-shaped seal member 105B is attached to the inside of the opening 109. FIGS. The seal member 105C is elastically mounted.

[0008]

By the way, in the upper die shown in FIGS. 6A, 7A, 8A and 8B, the striker 113 in the punch press is used. When the upper surface of the punch head 101 is pressed, the contact between the lower surface of the striker 113 and the upper surface of the punch head 101 is improved, and the seal members 105A to 105
C also reliably contacts the lower surface of the striker 113 and can prevent leakage of fluid from between the lower surface of the striker 113 and the upper surface of the punch head 101.

However, in the upper mold of FIG.
Punch body 10 to adjust punch length (height)
7 is lowered, when the upper end of the seal member 105A becomes lower than the upper surface of the punch head 101 as shown in FIG. 6B, a gap is formed between the lower surface of the striker 113 and the upper end of the seal member 105A. Therefore, there is a problem that air leaks from the slit 111 as shown by a dotted line, and the loss of air is large. In addition, the sealing member 105 extends from the upper end face of the punch body 107.
If the height to the upper end of A is increased, the durability of the seal member 105A is reduced due to the fact that the portion crushed by the striker 113 is increased, and so the seal member 105A
Therefore, there is a problem that the margin for adjusting the punch length is limited because the height of the punch cannot be increased.

In the upper die of FIG. 7A, when the punch body 107 is lowered to adjust the punch length, as shown in FIG. When the upper end is lower than the lower end of the sealing member 105B, air leaks from the slit 111 as shown by a dotted line, and there is a problem that the air loss is large. In addition, as shown by the opening 109a in FIG. 7A, when the depth is increased to increase the height of the ring-shaped sealing member 105B, the punch head 1
Since the effective screw portion of the screw hole 103 of No. 01 is reduced, the seal member 105B cannot be deepened, so that there is a problem that the margin for adjusting the punch length is limited.

In the upper die shown in FIGS. 8A and 8B, when the punch head 101 is pressed by the striker 113, the thread 117 of the punch head 101 tends to be tightened by the action of the stripper spring 115. The punch head 101 has a tapered portion 11 so that
9 are provided and a radial slit 111 is provided so as to easily cause deformation.
Although the seal member 105C elastically mounted on the punch head 101 is an elastic member, since the elasticity of the elastic member has a limit, the amount of deformation of the slit 111 is limited, and
There is a problem that it has an adverse effect on the tightening.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to increase the length adjustment allowance of the punch body without adversely affecting the tightness of the punch head with respect to the punch body. An object of the present invention is to provide an upper die for a punch press, which can prevent a fluid such as air or oil mist from leaking from a punch head.

[0013]

According to a first aspect of the present invention, there is provided an upper die for a punch press according to the present invention.
A punch having a punch body fitted in a cylindrical punch guide movably up and down and biased upward, and a connection port for guiding fluid to a punch portion at a lower end portion of the punch body is provided at an upper end portion of the punch body. In the upper die for pressing, a slit is provided in a direction in which a screw hole formed in a central portion of a punch head screwed to an upper end portion of the punch body is vertically split, and the slit is hermetically sealed with respect to the screw hole. The present invention is characterized in that a cylindrical seal member is elastically mounted, and an upper portion of the seal member is provided substantially equal to an upper surface height of the punch head.

Therefore, when the lower surface of the striker and the upper surface of the punch head come into contact with each other when the upper die is pressed by the striker in the punch press, the fluid supply port provided in the lower surface of the striker is inserted through the screw hole of the punch head. The fluid is supplied to the upper mold from the striker side by communicating with the connection port on the upper surface of the punch body. At this time, since the cylindrical sealing member is elastically mounted on the threaded portion of the screw hole in the slit and hermetically closed, the fluid is supplied while keeping the leakage of the fluid from the slit small.

Further, even when the width of the slit is narrowed by an external force applied to the punch head when the striker strikes the upper mold, the seal member is easily crushed because it has a cylindrical shape. The airtightness of the slit is always maintained without hindering the tightening of the punch head to the upper end of the body.

Further, since the seal member is elastically mounted in the slit in the screw portion of the screw hole, even if the depth of the seal member is increased, the effectiveness of the screw portion is maintained without airtightness. Therefore, the margin for adjusting the punch body can be increased by the depth of the seal member.

According to a second aspect of the present invention, there is provided an upper die for a punch press according to the first aspect, wherein a cross section having a diameter larger than the slit width is provided at a position along the threaded portion of the screw hole of the slit. It is characterized in that a circular hole for a seal member is provided, and a cylindrical seal member extending over the entire length of the seal member hole is inserted.

Therefore, the seal member inserted into the seal member hole having a diameter larger than the slit width maintains the airtightness of the screw hole in a stable state.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an upper die for a punch press according to the present invention will be described below with reference to the drawings.

Referring to FIG. 5, the upper die 1 according to the present embodiment is, for example, a turret punch press (not shown).
Are supported by an upper mold holder 3 such as an upper turret so as to be vertically movable. The upper mold 1 is mainly composed of a cylindrical punch guide 7 fitted in the mounting hole 5 of the upper mold holder 3 so as to be movable up and down, and a punch body 9 fitted in the punch guide 7 so as to be movable up and down. ing.

More specifically, a flange 11 is provided above the punch guide 7, and the flange 11 is supported by lifter springs 13 provided at a plurality of locations on the upper die holder 3.

At the lower end of the punch body 9, there is provided a punch 19 for punching a plate-like work W in cooperation with a lower die (die) 17 supported by a lower die holder 15. I have. The upper end 21 of the punch body 9 protrudes above the punch guide 7. The outer periphery of the upper end 21 of the punch body 9 has a tapered boss 23 and a radial slit 25. Is screwed on.

As shown in FIG. 5, the upper surface of the punch head 27 is formed slightly higher at the center portion than at the outer peripheral edge. Therefore, when the upper surface of the punch head 27 is pressed by the striker 53 in the punch press, the surface contact between the lower surface of the striker 53 and the upper surface of the punch head 27 is improved.

As shown in FIGS. 1 and 2, the slit 25 is formed so as to vertically divide a screw hole 29 at the center of the punch head 27.

A strong stripper spring 35 is elastically mounted between a ring-shaped spring seat 31 fitted on the outer periphery of the boss 23 and a spring seat 33 mounted on the upper part of the punch guide 7.

Therefore, the width of the slit 25 of the punch head 27 tends to be narrowed by the action of the stripper spring 35 for strongly fitting the spring seat 31 to the boss portion 23 of the punch head 27. The portion 37 (screw portion) tends to tighten the upper end 21 of the punch body 9. That is, the screwing portion 37 of the punch head 27 is configured to prevent loosening.

From the connection port 39 formed on the upper end face to the ejection port 4 formed on the lower end face, the axial center of the punch body 9 is formed.
1 is formed. A plurality of peripheral grooves 45 are formed on the outer peripheral surface of the punch body 9 for lubricating between the punch body 9 and the punch guide 7. Communication.

Further, in the slit 25 formed in the punch head 27, a cylindrical sealing member 49 made of an elastic member such as rubber is provided along the screwing portion 37 of the screw hole 29 at the center of the punch head 27. It is armed. Moreover, the upper end of the sealing member 49 is
Are provided at substantially the same height as the upper surface of the central portion.

More specifically, referring to FIG. 1, FIG. 2 and FIG. 3, the punch head 27 has a circular cross section having a diameter slightly larger than the slit width at the slit 25 along the screw hole 29 at the center. A hole 51 for a seal member is provided.
Since the seal member hole 51 is provided in the slit 25, it is inevitably a half-split hole. A cylindrical sealing member 49 having a length extending over the entire length is inserted into the sealing member hole 51. That is, the sealing member 4
The lower end of 9 is in contact with the bottom of the seal member hole 51, and the upper end of the seal member 49 is provided on the upper surface of the punch head 27 at substantially the same height.

With the above arrangement, when the upper die 1 is pressed by the vertically movable striker 53 in the punch press as shown in FIG. Lower surface is punch head 2
7, the fluid supply port 55 provided on the lower surface of the striker 53 and the connection port 39 provided on the upper surface of the punch body 9 are airtight. Connected.

Further, the spring seat 31 is pushed up by the pressure of the stripper spring 35, and is strongly fitted to the boss 23 of the punch head 27, whereby the width of the slit 25 of the punch head 27 is reduced, and the screw of the punch head 27 is screwed. The attachment portion 37 tightens the upper end portion 21 of the punch body 9, and the screw attachment portion 37 of the punch head 27 is prevented from loosening.

At this time, if pressure is applied in the direction in which the width of the slit 25 is reduced, the seal member 49 is easily crushed because it has a cylindrical shape, and the state shown in FIG. , The upper end 21 of the punch body 9 is strongly fastened to the threaded portion 37 of the punch head 27. By the way, when the sealing member 49 is not hollow but has a columnar shape with a circular cross section, the elasticity (in other words, the contraction width) of the sealing member 49 is limited, so that FIG.
As shown in (C), the tightening of the punch head 27 is prevented, but the hollow cylindrical sealing member 49 does not prevent the tightening of the punch head 27, and is always in close contact with the slit 25. The airtightness is maintained because it is in the state of being performed.

Even if the depth of the sealing member 49 is increased, the screwed portion 37 of the punch head 27 is not damaged at all, as shown in FIG. Therefore, the adjustment allowance for the punch body 9 can be taken by the depth of the seal member 49 as shown in FIG.

Therefore, when the oil mist is supplied from the oil mist supply device 57 connected to the fluid supply port 55 of the striker 53 as shown in FIG.
The leakage of oil mist from the slit 25 of the punch head 27 is prevented, and the supply of oil mist to the through-hole 43 of the punch body 9 is performed efficiently.

A part of the oil mist supplied to the through hole 43 of the punch body 9 is transferred from the communication hole 47 to the peripheral groove 45 on the outer peripheral surface.
The lubrication between the outer peripheral surface of the punch body 9 and the inner peripheral surface of the punch guide 7 is performed. Further, a part of the oil mist is ejected downward from the ejection port 41, so that the punched pieces punched during the punching of the work W are reliably dropped downward.

Accordingly, the supply of oil mist from the fluid supply port 55 of the striker 53 to the connection port 39 of the punch body 9 can be efficiently performed without causing any loss.

The present invention is not limited to the above-described embodiment, but can be embodied in other forms by making appropriate changes.

[0038]

As can be understood from the above embodiment, according to the first aspect of the present invention, when the striker in the punch press strikes the upper mold, the lower surface of the striker and the upper mold are pressed. When the upper surface abuts, the fluid supply port provided on the lower surface of the striker communicates with the connection port on the upper surface of the punch body via the screw hole of the punch head, and the fluid is supplied from the striker side to the upper mold. At this time, since a cylindrical sealing member is elastically mounted on the screw portion of the screw hole in the slit and is airtightly closed, it is possible to supply the fluid while keeping the leakage of the fluid from the slit small. it can.

Further, even when the width of the slit is narrowed by an external force applied to the punch head when the striker strikes the upper mold, the seal member is easily crushed because the seal member has a cylindrical shape. The airtightness of the slit can be maintained without interrupting the tightening of the punch head to the upper end of the slit.

Further, since the sealing member is elastically mounted in the slit along the threaded portion of the screw hole, even if the depth of the sealing member is increased, the effectiveness of the threaded portion is not impaired and airtightness is maintained. Is held, the amount of adjustment of the punch body can be increased by the depth of the seal member.

According to the second aspect of the present invention, the seal member is inserted into the seal member hole having a diameter larger than the slit width, so that the screw hole can be maintained in a stable airtight state.

[Brief description of the drawings]

FIG. 1 shows an example of an embodiment of the present invention, and is a perspective view of a nut head on which a seal member is mounted.

FIG. 2, showing an example of an embodiment of the present invention, is a plan view of a nut head on which a sealing member is mounted.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4A is a plan view of a main part showing a state of a hollow seal member when no pressure is applied in a direction in which the slit is narrowed, and FIG. 4B is a view in which a pressure in a direction in which the slit is narrowed is applied; FIG. 4C is a plan view of a principal part showing a deformed state of the hollow seal member at this time, and FIG. 4C is a plan view of a principal part showing a state of the seal member having a circular cross section when pressure is applied in a direction to narrow the slit. is there.

FIG. 5 shows an example of the embodiment of the present invention, and is a cross-sectional view showing a state where the striker is in contact with an upper mold.

6 (A) is a cross-sectional view of a main part of a conventional example, and FIG. 6 (B) is a cross-sectional view showing a state where fluid leakage occurs.

7 (A) is a cross-sectional view of a main part of a conventional example, and FIG. 7 (B) is a cross-sectional view showing a state when fluid leakage occurs.

8 (A) is a plan view of the main part, and FIG. 8 (B) is a cross-sectional view of the main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper die 3 Upper die holder 9 Punch body 13 Lifter spring 25 Slit 27 Punch head 29 Screw hole 35 Stripper spring 37 Threaded part (screw part) 39 Connection port (of punch body 9) 41 Spout (of punch body 9) 49 seal member 51 seal member hole 53 striker 55 fluid supply port

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21D 28/34 B21D 28/36 B21D 37/18 B21D 45/04

Claims (2)

(57) [Claims] 1. A punch body fitted in a cylindrical punch guide so as to be movable up and down is urged upward, and a connection port for guiding fluid to a punch portion at a lower end portion of the punch body is provided at an upper end portion of the punch body. In the upper die for punch press, a slit is provided in a direction in which a screw hole formed in a central portion of a punch head screwed to an upper end portion of the punch body is vertically split, and the screw hole is formed in the slit. On the other hand, an upper die for a punch press, wherein a cylindrical sealing member is elastically mounted in an airtight state, and an upper portion of the sealing member is provided substantially equal to an upper surface height of a punch head. 2. A sealing member hole having a circular cross section having a diameter larger than the slit width is provided at a position along a screw portion of a screw hole of the slit, and a cylindrical sealing member extending over the entire length of the sealing member hole is provided. The upper die for a punch press according to claim 1, wherein the upper die is inserted.