JP2740122B2 - Upper mold for press brake - 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 which is detachable from an upper die holder device in a press brake, and more particularly, to increase a clamping force when the upper die is mounted on the upper die holder device. The present invention relates to an upper die capable of operating an upper die holder device.

[0002]

2. Description of the Related Art As is well known, a press brake includes an upper table (sometimes called an upper apron) and a lower table (sometimes called a lower apron) which are vertically opposed to each other. This is a configuration in which one of the upper table and the lower table is driven up and down as a ram as appropriate.

[0003] In the press brake, an upper die is mounted on a lower portion of an upper table and a lower die is mounted on an upper portion of the lower table in order to bend a plate-shaped work.

In the above structure, the work positioned between the upper mold and the lower mold is bent by moving the movable table up and down to engage the upper mold and the lower mold. Things.

In a press brake, for example, in order to exchange an upper die according to a bent shape of a work, etc., a plurality of upper die holders are attached to a lower portion of an upper table, and the upper die can be attached / detached by the multiple upper die holders. It is a structure to support.

In the conventional upper die holder, an upper die clamp is attached to a holder main body attached to a lower part of an upper table, and the upper die clamp is tightened with a tightening bolt, whereby the upper die is clamped by the holder main body and the upper die clamp. The upper part is strongly fastened and fixed.

[0007] Therefore, conventionally, in order to attach and detach the upper mold to and from the upper table, a large number of tightening bolts provided on a large number of upper mold holders must be operated, which is extremely troublesome and troublesome. There was a problem.

Therefore, an upper die holder device has been developed in which an air cylinder is mounted on the upper die holder, and the upper die clamp is tightened and released by the air cylinder.

[0009]

In the upper die holder device having the above structure, a large number of upper die holder devices must be provided with air cylinders, respectively, and an air source is required. Problem.

In the conventional upper holder device,
If the upper die clamp provided by the upper die holder device is released, the upper die may fall.

Further, in the conventional upper die holder device, when the upper die is mounted, the upper die clamp is gently tightened so that the upper die does not drop, and then the upper die is aligned in a state where the lower die and the upper die are aligned. There is a problem that the clamp must be strongly tightened, and the operation is troublesome.

[0012] As a preceding example which is considered to be related to the present invention, there is, for example, EP0387121A1.

In this prior example, the upper die is clamped between the holder main body and the upper die by means of an upper die swingably pivotally attached to the upper table of the press brake. The upper die is pivoted so as to avoid the pivot on which the upper clamp is pivotally mounted. The upper die is rotated while supporting a single die weighing 20 kg to 30 kg manually on the front side of the machine. Doing is extremely dangerous to the operator's waist and hands.

Further, in the case where a number of upper dies are connected in the longitudinal direction and a number of the upper dies are attached, an end of the next upper die is inserted from the longitudinal direction and connected to an upper die clamp which has already clamped an end of the upper die. There is also a problem that can not be.

The present invention has been made in view of the above-described conventional problems, and has as its object the case where the upper die can be easily attached and detached and replaced and the upper die is released from being fixed. Another object of the present invention is to provide an upper mold that is removable from an upper mold holder device from which the upper mold does not drop.

[0016]

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, an upper die for a press brake according to the present invention has a structure in which the upper die is raised relatively to a holder body of the press brake. In order to make the upper die for press brake pressed and fixed to the holder main body by the reaction force of the upper die clamp provided in the holder main body, and to move the upper die clamp to a portion corresponding to the upper die clamp at the time of relative ascent. The inclined angle of the inclined surface is 7 to 11 degrees with respect to the vertical, and the lower surface of the inclined surface is freely engageable with the locking projection provided on the upper mold clamp. An engagement groove is provided.

Further, a contact surface is provided for contacting the lower end surface of the support plate provided on the holder body, the lower surface of the engagement groove is provided at a higher position than the contact surface, and the upper surface is slightly inclined, and A vertical surface is formed between the inclined surface and the engagement groove.

Further, the support plate provided at the lower portion of the holder body in the upper die holder device mounted on the lower portion of the upper table in the press brake and the upper die holder body can swing and the upper die can be pressed against the support plate. An upper mold for a press brake that is detachable between an upper mold clamp provided and a contact surface that can freely contact the lower surface of the support plate and a front or rear surface of the support plate that is slidably slidably contacted. Surface and the upper die relative to the support plate so as to contact the contact surface with the lower surface of the support plate. An inclined surface for swinging the upper die clamp, and a processing part for processing the work in cooperation with the lower die provided in the press brake; Of when the upper surface of the engaging groove provided in the upper die is in a state of being supported by the locking projection, the spacing dimension H between the contact surface of the lower surface and the upper mold of the support plate the following equation H =
(B ² · P) / (A ² · k · tan θ).

Here, A is the dimension from the swing center of the upper mold clamp to the elastic means for pushing the upper mold clamp, and B is the pressing action by which the upper mold clamp pushes the upper mold from the swing center to the support plate. The average dimension up to the portion, P is the pressing force for pressing the upper die against the support plate, K is the elastic modulus of the simple means, and θ is the inclination angle of the inclined surface.

[0020]

In the above structure, the upper portion of the upper die is positioned between the support plate and the upper clamp in the upper die holder device, and the engagement groove formed in the upper die is provided at the lower portion of the upper die clamp. The lower die of the upper die clamp is pressed by the inclined surface provided on the upper die by engaging the stop protrusion and moving the upper die relatively to the support plate, so that the lower part of the upper die clamp and the support plate In this case, the clamping force due to the reaction force at that time gradually increases, and the upper mold is securely clamped.

When the clamping force is released, the upper surface of the locking projection provided on the lower portion of the upper mold clamp and the upper surface of the engaging groove of the upper mold engage to prevent the upper mold from falling. It is.

Therefore, the upper die can be safely and easily exchanged with the upper die holder device without using a tool.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS To facilitate understanding, first, the overall structure of an upper die holder device 1 to which the present invention is applied will be described.

Referring to FIGS. 1 to 3, the upper die holder device 1 according to the present embodiment is detachably attached to a lower portion of an upper table 3 in a press brake (not shown).

The upper die holder device 1 presses and fixes the upper part 9U of the upper die 9 to a holder body 5 detachably attached to the upper table 3 and a support plate 7 integrally provided below the holder body 5. An upper mold clamp 11 pivotally mounted on the holder body 5 in order to
A clamping force adjusting device 13 capable of adjusting the clamping force of
A clamp releasing device 15 capable of releasing the upper die 9 from being clamped by the upper die clamp 11, and a contact member 1 provided at the lower part of the upper die clamp 11 so as to be slightly rotatable.
7 is provided with a contact surface 17S that is slidable on an inclined surface 9S provided on the upper die 9.

More specifically, the holder main body 5 has a mode in which the thin support plate 7 is integrally provided below the thick upper block portion 5B in the front-rear direction (the horizontal direction in FIGS. 2 and 3). ing. On the front surface (left side surface in FIG. 2) of the upper block 5B of the holder body 5, a mounting plate 21 protruding upward is mounted via a plurality of bolts 19 (see FIG. 1).

The mounting plate 21 is brought into contact with the lower portion of the front surface of the upper table 3, and the clamp jaw 25 is tightened by a tightening bolt 23 screwed to the upper table 3 to press the mounting plate 21 against the upper table 3. Thereby, the holder main body 5 can be attached to the upper table 3.

In order to adjust the vertical position of the holder body 5, a wedge member 27 is interposed between the upper surface of the holder body 5 and the lower surface of the upper table 3, and the wedge member 27 is attached to the wedge member 27. A long hole 29 in the left-right direction provided in the plate 21 (FIG. 1)
) Is screwed.

In the above configuration, the wedge member 27 is moved in the left-right direction in FIG. 1 while the clamp jaw 25 is held in a weakly tightened state so that the holder main body 5 does not drop and the fixing bolt 31 is loosened. By performing the adjustment, the holder main body 5 can be finely adjusted vertically with respect to the upper table 3.

The upper die clamp 11 is made of a plate-like member having substantially the same width as the width of the holder body 5 in the left-right direction. The holder body 5 is swingably mounted on the holder body 5 so as to be pressed against the support plate 7 and fastened and fixed.

More specifically, the upper mold clamp 11 passes through a plurality of through holes 11H provided substantially at the center of the upper mold clamp 11 in the vertical direction and is screwed and fixed to the support plate 7 horizontally. It is swingably supported in the front-rear direction by the mounting bolt 33. The head of each of the mounting bolts 33, the upper clamp 11, and the contact surface are formed on a spherical surface 35 so that the upper clamp 11 can be easily swung. The upper clamp 11 and the support plate 7
An elastic body 37, such as a coil spring or a rubber body, acting to separate them from each other is provided between them.

A lower surface of the upper clamp 11 is formed with an inclined surface 11S whose upper side is inclined toward the support plate 7, and the contact member 17 is slightly formed on the inclined surface 11S. It is rotatably mounted.

More specifically, through holes are provided on both left and right sides of the lower end of the upper mold clamp 11, and through mounting bolts 39 which pass through the through holes and are screwed to the contact members 17, whereby through holes are provided. A clearance is provided between the through hole and the mounting bolt 39, and the contact member 17 is attached to the upper die clamp 11 so as to be slightly rotatable.

The locking projection 11K, which is engageable with and disengageable from the right and left engaging grooves 9G formed in the upper die 9, projects from the lower end of the upper die clamp 11 below the contact member 17. It is.

The upper die clamp 11 applies a clamp force for pressing the upper die 9 to the support plate 7 and the clamp force adjusting device 13 for adjusting the clamp force is provided on the upper block portion 5B. The interior is provided in the provided horizontal hole 5H.

More specifically, as shown in FIG. 3, the clamping force adjusting device 13 includes a nut member screwed to the adjusting screw 41 to adjust the position of the ring member 43 movably fitted to the adjusting screw 41. 45 and the head 41H of the adjusting screw 41
And an elastic member 47 such as a spring elastically mounted between the ring member 43.

In the above configuration, by adjusting the screwing position of the nut member 45 with respect to the adjusting screw 41 to adjust the compression of the elastic member 47, the energy storage force of the elastic member 47 can be adjusted.

The head 41H of the adjusting screw 41 in the clamping force adjusting device 13 is in contact with the back wall of the hole 5H, and the ring member 43 is in contact with a cylindrical pressing member 49 including a nut member 45. In contact.

The pressing member 49 is provided with the clamp releasing device 15 provided above the upper die clamp 11.
The tip of the tightening screw 51 is in contact. More specifically, the clamp release device 15 is provided with the upper clamp 11.
And a screw 53 which is screwed through the upper part of the screw. A lever 53 is integrally attached to the screw 51.

Therefore, by operating the lever 53, the tightening screw 51 is tightened.
Can be loosened. In order to limit the operation range (rotation range) of the lever 53, left and right stopper pins 55 are mounted on the mounting plate 21.

In the above configuration, the holder body 5
When the upper part 9U of the upper die 9 is positioned between the support plate 7 and the upper die clamp 11, the lever 53 of the clamp release device 15 is rotated to the right position R in FIG. When the tightening screw 51 is tightened, the elastic member 47 in the clamp force adjusting device 13 is further compressed, and the stored force of the elastic member 47 increases. The upper mold 9 is more strongly tightened and fixed.

Conversely, when the lever 53 is turned to the left position L in FIG. 1 to loosen the tightening screw 51, the tightening and fixing of the upper mold 9 by the upper mold clamp 11 is released. .

As described above, when the upper mold 9 is tightened and released by the upper mold clamp 11 by operating the lever 53, the upper mold clamp 11 is moved right and left in FIG. Rocks.

As described above, when the tightening and fixing of the upper mold 9 is released, the plurality of bolts 57 screwed and fixed to the holder body 5 through the upper part of the upper mold clamp so that the lower part of the upper mold clamp 11 is opened. A spring 59 for opening the clamp is elastically mounted between the upper clamp 11 and the upper die 11.

Therefore, the upper die clamp 11 can tighten and fix the upper die 9 at a fixed position.

As shown in FIG. 4, the upper die 9 which is detachably attached to and replaced with the upper die holder device 1 having the above-mentioned structure has a contact surface 9 which comes into contact with the lower end surface 7E of the support plate 7.
F is provided. The portion protruding above the contact surface 9F is the upper portion 9U, and the upper portion 9U is provided with a vertical sliding contact surface 9V slidably in contact with the front surface 7F or the rear surface of the support plate 7. . The engaging groove 9G is formed on a surface opposite to the sliding contact surface 9V, and a slight gap is formed between the engaging groove 9G and the inclined surface 9S formed above the engaging groove 9G. A vertical surface 9SV is formed.

The vertical surface 9SV can be provided as a clamping surface when the upper die 9 is clamped by a general upper die clamp, for example.

Further, the upper die 9 has at its lower end a work processing portion 9M for bending the work W in cooperation with the lower die 63 mounted on the lower table 61 (see FIG. 2) of the press brake. I have.

As is apparent from FIG. 4, the lower surface 9GL of the engaging groove 9G in the upper die 9 is formed at a position higher than the contact surface 9F. The upper surface 9GF of the engagement groove 9G is slightly inclined so that the depth of the groove becomes lower corresponding to the upper surface of the locking projection 11 of the upper die clamp 11.

With the above configuration, the lower end portion of the upper die clamp 11 can be relatively short at a higher position than the lower end surface 7E of the support plate 7, and thus interferes with the work W when the work W is bent at an acute angle, for example. There is no such thing.

The locking projection 11 of the upper mold clamp 11
When the K and the upper surface 9GF of the engaging groove 9G of the upper die 9 are in contact with each other and the upper die 9 is locked, the contact surfaces of the upper die 9 are slightly inclined. Vertical sliding contact surface 9V
Tend to always contact the support plate 7.

Further, since the engaging groove 9G is provided at a position higher than the contact surface 9F, the dimension from the corner where the contact surface 9F and the sliding contact surface 9V intersect can be increased, and the same height can be obtained. In this case, the strength can be increased as compared with the case where it is provided.

In the above configuration, when the upper die 9 is detached from the upper die holder device 1, the following operation is performed to mount the upper die 9 on the upper die holder device 1.

First, the lever 53 of the clamp releasing device 15 is turned to the position R to hold the tightening screw 51 in the tightened state. As described above, even when the tightening screw 51 is tightened, the support plate 7 and the upper mold
Is in an open state with the lower end.

Therefore, the upper part 9U of the upper die 9 is inserted between the support plate 7 and the upper die clamp 11 from the left and right direction, and the engaging groove 9G formed in the upper die 9 is inserted into the upper die 9 as shown in FIG. Engage with the locking projection 11K provided on the lower end of the clamp 11 and make the inclined surface 9S of the upper die 9 come into contact with the contact surface 17S of the contact member 17.

Thereafter, the movable side of the upper and lower tables 3 and 61 in the press brake is moved up and down to engage the upper die 9 and the lower die 63, so that the upper die 9 rises relatively to the holder body 5. Is done.

As described above, the upper die 9 is attached to the holder body 5.
Gradually rises, the inclined surface 9S of the upper die 9 presses the lower end of the upper die clamp 11 via the contact member 17 to the left in FIGS. Accordingly, the upper mold clamp 11 is gradually rotated in the counterclockwise direction in FIG.
Will be gradually compressed.

Therefore, the upper mold 9 relatively rises,
When the contact surface 9F comes into contact with the lower end surface 7E of the support plate 7, the upper die clamp 11 firmly clamps the upper die 9U by the action of the energy storage force of the elastic member 47.

Therefore, the upper die 9 can be easily mounted on the upper die holder device 1.

As described above, the upper die 9 is attached to the upper die holder device 1.
In order to remove the upper die 9 from the upper die holder device 1 after mounting, the lever 53 is turned to the left position L and the tightening by the tightening screw 51 is loosened as described above. When the fastening screw 51 is loosened as described above, the fastening of the upper mold 9 by the upper mold clamp 11 is released.

When the tightening and fixing of the upper die 9 by the upper die clamp 11 is released as described above, the upper die 9 descends to its original lowered position (the position in FIG. 2) by its own weight. In this case, the upper die 9
Since the upper surface of the engaging groove 9G is hooked on the locking projection 11K, the upper mold 9 does not fall and is safe.

As described above, the upper die 9 is removed from the upper die holder device 1 by moving the upper die 9 in the left-right direction when the upper die 9 is released from the tightening and fixing by the upper die clamp 11. Is what you can do.

As will be appreciated, according to the embodiment,
It is possible to easily attach and detach the upper die 9 to and from the upper die holder device 1 with a simple configuration without using any tool or the like.

As will be understood, when the lower portion of the upper mold clamp 11 is pressed by the inclined surface 9S of the upper mold 9, the clamping force (pressing force) of the upper mold 9 on the support plate 7 by the upper mold clamp 11. Is gradually increased, for example, the upper mold clamp 11, the clamping force adjusting device 13 and the like are a kind of clamping force in which the clamping force gradually increases when the upper mold 9 rises relatively to the support plate 7. This constitutes a gradual increase mechanism.

As a part of the structure of the above-mentioned mechanism for gradually increasing the clamping force, a clamping force adjusting device 13 having an elastic member 47 is provided. Instead of the clamping force adjusting device 13, a compressive fluid (gas) is provided. It is also possible to employ a fluid pressure cylinder (gas spring). Further, the upper clamp 11 itself may be configured by a leaf spring, and the clamp adjusting device 13 may be omitted, and a configuration utilizing the elastic deformation of the upper clamp 11 may be adopted.

That is, various structures can be adopted as the clamping force gradually increasing mechanism of the upper die holder device.

Further, the upper die holder 1 according to this embodiment is
The upper die 9 can be mounted on the rear side of the support plate 7 by inverting the front and rear of the upper die 9.

That is, in order to mount the upper die 9 on the rear surface of the support plate 7, a rear upper clamp 65 is mounted on the rear surface of the support plate 7.

More specifically, as shown in FIG. 3, a head 6 is provided on the rear surface of the support plate 7 in the holder body 5.
7H is formed into a hemispherical stud 67 and the mounting bolt 6
9, the upper clamp 65 is swingably supported by the stud 67.

In order to operate the mounting bolt 69, a tool hole 11T is formed in the upper clamp 11 on the front side, and the upper clamp 6 is formed in the head 67H of the stud 67.
The detent pin 71 engaged with the groove 65G formed in the fifth pin 5 is attached. Therefore, the stud 67 does not rotate when the mounting bolt 69 is rotated.

In order to share the clamping force adjusting device 13 with the upper clamp 11 on the front side and the upper clamp 65 on the rear side, a small-diameter hole 73 is formed in the back wall of the hole 5H of the holder body 5. It is. A contact member 75 attached to the upper portion of the upper clamp 65 on the rear side passes through the small-diameter hole 73 and contacts the head 41H of the adjusting screw 41.

Further, a ring nut 77 for regulating the pressing member 49 of the clamping force adjusting device 13 is screwed on the inlet side of the hole 5H.

In the above configuration, the upper die 9 can be firmly pressed and fixed to the rear side surface of the support plate 7 by the rear upper die clamp 65 by tightening the mounting bolt 69. Conversely, by loosening the mounting bolt 69, the upper die 9 is released from being clamped by the upper die clamp 65 on the rear side.

The lever 53 is operated by holding an appropriate interposed object between the front upper mold clamp 11 and the support plate 7 and holding the upper mold clamp 11 in an immobile state. Then, the upper die 9 may be tightened and fixed and released by the upper die clamp 65 on the rear side.

That is, the upper die 9 can be selectively mounted in front of and behind the support plate 7 in accordance with the bent shape of the work, and the upper die 9 can be attached to and detached from the upper die holder device 1. Can be easily performed.

As will be understood from the above description of the embodiment, according to this embodiment, the attachment and detachment of the upper mold 9 with respect to the upper mold holder device 1 can be easily performed with a simple configuration, and When the fixing of the upper die 9 by the upper die holder device 1 is released, the upper die 9 does not drop and the safety is further improved.

By the way, as described above, the upper die 9 is moved upward relative to the support plate 7 in the upper die holder device 1, and the lower surface of the upper die clamp 11 is pressed by the inclined surface 9S of the upper die 9. The upper clamp 1
Since the clamping force by 1 increases gradually,
When the contact surface 9F of the upper die 9 contacts the lower end surface 7E of the support plate 7, it is necessary that a sufficiently large clamping force be obtained.

Therefore, as shown schematically in FIG. 5, when the upper surface of the engagement groove 9G of the upper die 9 is in contact with the upper surface of the locking projection 11K of the upper die clamp 11, the support plate 7 The distance between the lower end surface 7E of the upper die 9 and the contact surface 9F of the upper die 9 is H; the elastic means 47 of the clamp force adjusting device 13 for pressing the upper die clamp 11 from the center of rotation of the upper die clamp 11;
The average dimension from the center of rotation to the pressing portion where the upper die clamp 11 presses the upper die 9 against the support plate 7 via the contact member 17 is B; The pressing force for pressing is P;
Is the elastic modulus of K; and the inclination angle of the inclined surface 9S with respect to the vertical is θ; the dimension H is desirably a dimension represented by the following equation.

H = (B ² · P) / (A ² · K · tan θ) Here, as the upper die 9 rises relatively to the support plate 7, as shown in FIG. The lower part of the clamp 11 is displaced by ΔL, and the upper part is displaced by ΔX to compress the elastic member 47, and the clamping force is gradually increased.

If the dimension H is relatively smaller than the dimension expressed by the above equation, the contact surface 9F of the upper die 9 is raised by the relative slight rise of the upper die 9, so that the lower end surface 7E of the support plate 7 is formed. , And a sufficient clamping force cannot be obtained, so that the upper die 9 may fall, which is not desirable.

On the contrary, when the dimension H is relatively larger than the dimension expressed by the above equation, when the contact surface 9F of the upper die 9 contacts the lower end surface 7E of the support plate 7, the elastic member 47 is Although the displacement amount is larger than the above-mentioned ΔX and a large clamping force is obtained, when the lever 53 is operated to release the clamp of the upper die 9, it may not be released sufficiently. It is not desirable because the attachment and detachment of the upper mold 9 may become difficult.

Therefore, it is desirable that the inclination angle θ of the inclined surface 9S in the upper die 9 is about 5 to 20 degrees. That is, when the inclination angle is 5 degrees or less, the elastic member 47
The dimension H must be increased in order to cause the deformation, and when it is 20 degrees or more, the dimension H may be small, but the component force in the downward direction is large, which is not desirable.

In order to hold the upper die 9 so as not to drop by its own weight, the frictional force between the inclined surface 9S of the upper die 9 and the contact surface 17S of the contact member 17 is larger than the own weight of the upper die 9. It is necessary to be. Above friction force (maximum static friction force)
Is represented by the coefficient of static friction × direct pressure, and when the friction angle is θ, the friction coefficient is represented by tan θ.

The coefficient of friction varies depending on the roughness of the surface between the inclined surface 9S and the contact surface 17S, the surface condition such as the material, and the presence or absence of lubricating oil. 0.20, it is more preferable that the inclination angle θ of the inclination angle 9S be about 7 to 11 degrees.

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

That is, as shown in FIG. 6, for example, in order to improve the wear resistance of the inclined surface 9S and the sliding contact surface 9V of the upper die 9, an alloy or the like is formed on the inclined surface 9S and the sliding contact surface 9V. It is also possible to form the high-hardness portion 9H by providing a tip, coating, or quenching.

FIGS. 7 to 10 are explanatory views for reference of an upper die holder to which the upper die 9 according to this embodiment can be mounted.

The upper die holder 100 shown in FIG. 7 has a structure in which a clamp holder 101 is attached to the support plate 7 of the holder main body 5 by bolts 103 so as to be freely tightened, and a clamp 105 is movably provided below the clamp holder 101. It is.

The clamp 105 is formed in a hemispherical or semi-cylindrical shape, and is slidably fitted in a hole 101H provided in a lower portion of the clamp holder 101.
7 is rotatably supported. A suitable elastic member 10 such as a disc spring or urethane rubber is used as an elastic means between the slider 107 and the bottom of the hole 101H.
9 is loaded.

In this embodiment, the support plate 7 of the holder body 5 is tightened by tightening the bolt 103.
The distance between the support plate 7 and the clamp 105 is constant, and the distance between the support plate 7 and the clamp 105 is constant.

The support plate 7 and the clamp 105
After inserting and positioning the upper part 9U of the upper mold 9 from the left and right direction (the direction orthogonal to the paper surface), the upper mold 9 is moved up relative to the holder body 5 so that the elastic member 109 is compressed. As a result, the upper part 9U of the upper die 9 is pressed and fixed to the support plate 7 due to the accumulating force.

The pressing and fixing of the upper die 9 is released by the bolt 1
03 by loosening the tightening.

In FIG. 8, the hole 101H shown in FIG.
A wedge-shaped spring seat 111 is provided at the bottom of the, and the spring seat 111 is adjusted by a wedge 115 whose position is adjusted by an adjustment screw 113. Other configurations are the same as those in FIG.

According to this configuration, the energy stored in the elastic member 109 can be adjusted via the spring seat 111 by adjusting the movement of the wedge 115 with the adjusting screw 113.

In FIG. 9, a thin portion 101A is formed in a part of the clamp holder 101, and the thin portion 101A is easily elastically deformed.

According to this configuration, the clamp holder 101
This is an embodiment in which elastic means are provided.

In the configuration shown in FIG. 10, a bolt 103 movably penetrates the support plate 7, and an elastic member is provided between a nut member 117 as a fastening tool screwed to the tip of the bolt 103 and the support plate 7. 119 is interposed.

[0098]

As will be understood from the above description of the embodiment, according to the present invention, the upper die is moved upward by relatively moving the upper die relative to the support plate in the upper die holder device. The upper die can be easily attached to and detached from the upper die holder device having a configuration in which the force increases.

Further, when the upper die is mounted on the upper die holder device, a sufficient clamping force can be obtained.
In addition to preventing the upper mold from falling due to insufficient clamping force,
There is no case where it becomes difficult to attach and detach the upper mold due to excessive clamping force.

Further, when the upper die 9 is attached, detached and replaced, the upper die 9 is in a locked state to ensure safety.

Further, by providing the vertical surface provided on the upper die as the holding surface, it is possible to attach the upper die to the upper table by a conventional general upper die clamp.

[Brief description of the drawings]

FIG. 1 is a front view of an upper die holder device.

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

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

FIG. 4 is an explanatory view showing the shape of an upper die.

FIG. 5 is an explanatory view schematically showing a relationship between the upper die holder device and the upper die.

FIG. 6 is an explanatory view showing a modification of the upper die.

FIG. 7 is an explanatory view showing an upper mold holder to which the upper mold according to the present embodiment can be mounted.

FIG. 8 is an explanatory view showing an upper die holder to which the upper die according to the present embodiment can be mounted.

FIG. 9 is an explanatory view showing an upper mold holder to which the upper mold according to the present embodiment can be mounted.

FIG. 10 is an explanatory view showing an upper die holder to which the upper die according to the present embodiment can be mounted.

[Description of Signs] 1 Upper die holder device 7 Support plate 9 Upper die 11 Upper die clamp 9G Engagement groove 9F Contact surface 9S Inclined surface

Claims (7)

(57) [Claims] 1. An upper die for press brake, which is pressed and fixed to the holder main body by a reaction force of an upper die clamp provided on the holder main body when the upper die is relatively raised with respect to the holder main body of the press brake. A portion corresponding to the upper mold clamp is provided with an inclined surface for moving the upper mold clamp during relative ascent, and the inclination angle of the inclined surface is about 7 to 11 degrees with respect to the vertical. An upper die for press brake, characterized in that an engagement groove is provided below the inclined surface and is engageable with a locking projection provided on the upper die clamp. 2. A contact surface which comes into contact with a lower end surface of a support plate provided on a holder main body, a lower surface of an engagement groove is provided at a higher position than the contact surface, and an inclined surface and an engagement groove are provided. 2. A vertical surface is formed between the first and second surfaces.
Upper die for press brake described in. 3. The press brake according to claim 1, wherein the upper surface of the engagement groove is slightly inclined, and a vertical surface is formed between the inclined surface and the engagement groove. Upper type. 4. A contact surface which comes into contact with a lower end surface of a support plate provided on a holder main body, and a lower surface of an engaging groove is provided at a higher position and an upper surface is slightly inclined with respect to the contact surface. The upper mold for a press brake according to claim 1, wherein: 5. The press brake upper die according to claim 1, wherein a vertical surface is formed between the inclined surface and the engagement groove. 6. A support plate provided at a lower portion of a holder body of an upper die holder device mounted on a lower portion of an upper table of a press brake, and a support plate provided at a lower portion of the upper die holder body and capable of swinging an upper die against the support plate. An upper mold for a press brake that is detachable between an upper mold clamp provided and a contact surface that can freely contact the lower surface of the support plate and a front or rear surface of the support plate that is slidably slidably contacted. Surface and the upper die relative to the support plate so as to contact the contact surface with the lower surface of the support plate. It has an inclined surface for swinging the upper die clamp, and a processing part for processing the work in cooperation with the lower die provided in the press brake, and the upper die clamp is locked. The distance H between the lower surface of the support plate and the contact surface of the upper die is given by the following equation when the upper surface of the engagement groove provided on the upper die is supported by the projection. Upper mold for press brake. H = (B ² · P) / (A ² · k · tan θ) where A is the dimension from the swing center of the upper mold clamp to the elastic means for pressing the upper mold clamp, and B is the distance from the swing center to the swing center. The average dimension up to the pressing portion where the upper die clamp presses the upper die against the support plate, P is the pressing force pressing the upper die against the support plate, K is the elastic modulus of the unity means, θ is the inclination angle of the inclined surface. It is. 7. A support plate provided at a lower portion of a holder main body of an upper die holder device mounted on a lower portion of an upper table in a press brake and swingable by the upper die holder main body and an upper die can be pressed against the support plate. An upper mold for a press brake that is detachable between an upper mold clamp provided and a contact surface that can freely contact the lower surface of the support plate and a front or rear surface of the support plate that is slidably slidably contacted. Surface and the upper die relative to the support plate so as to contact the contact surface with the lower surface of the support plate. It has an inclined surface for swinging the upper die clamp, and a processing part for processing the work in cooperation with the lower die provided in the press brake, and the upper die clamp is locked. The distance H between the lower surface of the support plate and the contact surface of the upper mold is given by the following equation when the upper surface of the engagement groove provided on the upper mold is supported by the projection. An upper die for a press brake according to claim 1, 2, 3, 4, or 5. H = (B ² · P) / (A ² · k · tan θ) where A is the dimension from the swing center of the upper mold clamp to the elastic means for pressing the upper mold clamp, and B is the distance from the swing center to the swing center. The average dimension up to the pressing portion where the upper die clamp presses the upper die against the support plate, P is the pressing force pressing the upper die against the support plate, K is the elastic modulus of the unity means, θ is the inclination angle of the inclined surface. It is.