JPH0318009Y2 - - Google Patents

Description

[Detailed description of the invention] The invention relates to a press mold, and more specifically,
The present invention relates to a press die that can easily perform half blanking (a process in which punching is stopped midway through without completely punching out a plate material, and a recess is created in the workpiece by shearing in the same shape as a punch).

Conventionally, in the process of stopping the punching of a plate midway and forming a concave part in the plate by punching and shearing the shape (half-blanking), the punch in the press die was pressed to prevent the punch from completely punching out the plate. In order to set the lowering limit, the lowering limit of the ram (slide) in the press machine is set. Therefore, in the past, the preparation work before starting machining was rather troublesome. Further, when the plate material is thin, for example, 0.5 mm or less, the lowering limit of the ram must be set with high precision, and sometimes the plate material is completely punched out.

The present invention was devised in view of the above-mentioned conventional problems, and its first purpose is to easily adjust the lower limit of the punch according to the thickness of the plate material to be half-blanked. Our goal is to provide press dies.

The second object is to provide a press die that can handle the lowering limit of the ram of the press machine without setting it.

In order to achieve the above objects, the present invention provides an adjustment device between the punch guide and the punch body for adjusting the amount of descent of the punch body with respect to the punch guide which is vertically movably supported on the punch holder. It is something that occurs through the intervention of
Additionally, a mechanism is provided to absorb the downward movement of the ram of the press machine near its downward limit.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, a press mold 1 includes a punch portion 5 supported by a punch holder 3 and a die portion 9 supported by a die holder 7. As shown in FIG.

In this embodiment, the punch holder 3 and the die holder 7 are illustrated as being integrated, but they do not necessarily need to be integrated and may be provided separately.

In order to accurately perform half blanking on the plate material W in cooperation with the die section 9, the punch section 5 includes:
As will be described later, a punch lowering amount adjusting device is provided to adjust the lowering amount of the punch body relative to the punch guide.

That is, a vertical key groove 11G that engages with a key 13 provided on the punch holder 3 is formed on the outer circumferential surface of the cylindrical punch guide 11 that is vertically movably supported by the punch holder 3. A horizontal flange portion 11F is formed near the top of this punch guide 11, and a screw portion 11S that protrudes upward is formed. The punch guide 11 includes the flange portion 11F and the punch holder 3.
The lifter spring 15, which is relatively weak, is loaded between the two and is constantly biased upward and pushed up. Further, an annular nut member 17, which constitutes a part of a punch lowering amount adjusting device, is screwed onto the threaded portion 11S of the punch guide 11 so as to be able to adjust its vertical position.

A punch body 19 having an appropriately shaped lower end is fitted into the punch guide 11 so as to be vertically movable. A vertical keyway 19G is formed in the body of the punch body 19, and a key 2 fixed to the punch guide 11 is provided in this keyway 19G.
1 is engaged. The lower end of the punch body 19 is guided by a ring-shaped plate holding pad 23 that is detachably fitted into the lower end of the punch guide 11, and its lower end surface is normally located above the lower surface of the plate holding pad 23. It is located in

The upper part of the punch body 19 projecting upward from the punch guide 11 passes through the nut member 17, and a flange member 25 is integrally attached to the upper end of the punch body 19 via bolts 27. A stripping bullet 29, which is stronger than the lifter spring 15, is loaded between the flange member 25 and the flange portion 11F of the punch guide 11, and the punch body 19 is always urged upward. It is something that The upward movement of the punch body 19 and the like is achieved by a plurality of stopper bolts 31 that pass through the flange member 25 and are screwed onto the flange portion 11F of the punch guide 11.
It is regulated by.

A protrusion 25P is formed in the center of the flange member 25 and projects upward, and an annular top member 33 is fitted into the protrusion 25P so as to be movable up and down. This top member 33 and the flange member 2
5, in order to transmit the pressing force of the ram R in the press machine to the punch body 19, an extremely powerful bullet 35 made of, for example, a disc spring or urethane rubber is mounted between the top member 33 and the punch body 19. It is always biased upward. Note that the top member 33
is able to come into contact with the vertically movable ram R of the press machine, and its upward movement is regulated by a stop bar 37 fixed to the upper surface of the protrusion 25P of the flange member 25 by the bolt 27. has been done. The stopper 37 is fitted into the recess of the top member 33, and the top surface of the stopper 37 is located below the top surface of the top member 33.

The die portion 9 includes a die hole 39H facing the lower end of the punch body 19, and is comprised of a die 39 that is detachably supported by the die holder 7. Key groove 39 engaged with key 41 provided in 7
G is formed. Die hole 39H of the die 39
A push-up pad 43 is fitted in the push-up pad 43 so as to be movable up and down, and a bullet 47 is loaded between the push-up pad 43 and an adjustment screw 45 screwed into the die 39 so as to be able to adjust its position. Therefore, the push-up pad 43 is always urged upward, and under normal conditions, the top surface of the push-up pad 43 and the top surface of the die 39 are substantially aligned.

In the above configuration, after the plate material W is placed and positioned on the die 39, the punch part 5 is lowered by the ram R of the press machine, thereby performing half blanking on the plate material W. That is, the ram R in the press machine descends and contacts the top member 33, and the top member 33
When pressed down, the entire punch portion 5 descends against the lifter spring 15 via the powerful bullet 35, and the plate material W is pressed against the upper surface of the die 39 by the punch guide 11 and the plate holding pad 23. It is. The punch guide 11 etc. punches the plate material W into the die 39.
After the top member 33 is further lowered by the ram R, the punch body 19, flange member 25, etc. are lowered against the bullet 29, and the push-up pad 43 is lowered to perform half blanking on the plate material W using the lower end of the punch body 19 and the die hole 39H of the die 39.

When half blanking is performed as described above,
The flange member 25 comes into contact with the nut member 17, and the downward movement of the punch body 19 is stopped. At this time, by finely adjusting the vertical position of the nut member 17 in advance, the punch body 1 can be adjusted according to the thickness of the plate material W.
The lowering stop position (the amount of downward protrusion from the punch guide 11) of the punch body 9 can be adjusted, and the plate material W is not completely punched out by the punch body 19.

When the top member 33 is further lowered by the ram R after the punch body 19 etc. have stopped descending as described above, the bomb 35 is then compressed and only the top member 33 is lowered. It is. At this time, the upper surface of the stopper 37 is at a sufficiently low position so that the stopper 37 and the ram R do not come into contact even when the ram R reaches the bottom dead center.

When the ram R passes through the bottom dead center and rises, the bullets 15, 29, and 35 in the punch section 5 return to their original states, and the punch section 5 is raised to its original position. When the punch portion 5 is raised, the push-up pad 43 in the die 39 is pushed up by the bullet 47, causing the downward protrusion (blank) of the plate material W to protrude from the die hole 39H.

As can be understood from the above description of the embodiments, the gist of the present invention is as described in the claims of the utility model registration.According to the present invention, the amount of descent of the punch body relative to the punch guide is It can be easily adjusted according to the thickness of the plate material, and the ram R in the press machine can pass through the bottom dead center (lowest point of descent) when both the punch guide and punch body have stopped descending. without setting the limits precisely.
Half blanking can be performed accurately.

Note that the present invention is not limited to the above-mentioned embodiments, and by making appropriate changes,
Other embodiments may also be implemented. For example, a nut member for adjusting the amount of descent of the punch body relative to the punch guide may be screwed onto the punch body side instead of the punch guide side so as to be vertically adjustable. That is,
The present invention can be implemented in various forms by making appropriate changes.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view of a press die. Explanation of the symbols representing the main parts of the drawing, 3...
Punch holder, 7... Die holder, 11... Punch guide, 11F... Flange section, 19... Punch body, 17... Nut member, 29... Stripping machine, 33... Top member, 35... Bullet Machine, 39...Die.

Claims (1)

[Claims for Utility Model Registration] (1) A punch body 19 is disposed within a cylindrical punch guide 11 that is vertically movably supported by the punch holder 3.
into the punch body 19 so as to be vertically movable.
The die holder 7 is equipped with a die 39 having a die hole 39H facing the lower end, and the flange 11F provided at the upper part of the punch guide 11 and the punch body 19 protruding upward from the flange 11F are formed. A stripping bullet 29 is loaded and provided between the upper part of the punch guide 11 and the upper part of the punch body 19 to regulate the lowering of the punch body 19 with respect to the punch guide 11 and adjust the lowering amount. A freely adjustable punch lowering amount adjusting device is provided between the punch body 19 and the top member 33 supported on the upper part of the punch body 19 so as to be vertically movable, to apply the pressing force of the ram R of the press machine to the punch body 19. A bullet 35 more powerful than the strip bullet 29 is installed to transmit the punch, and a bullet above the top member 33 is provided so that the ram R can pass through the bottom dead center after the punch body 19 stops descending. A press mold characterized in that an end surface is provided at a position above the upper end surface of a punch body 19. (2) The punch lowering amount adjusting device is the punch guide 11.
Alternatively, a request for registration of a utility model characterized in that the nut member 17 is screwed onto one side of the punch body 19 so as to be vertically adjustable and comes into contact with the other side to freely restrict the downward movement of the punch body 19 with respect to the punch guide 11. The press mold according to item 1.