JPH037046Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a blade pressing device for a plate bending machine of a type in which the blade is pressed by a number of hydraulic cylinders.

In the above-mentioned plate bending machine, when bending a plate by extending the hydraulic cylinders all at once, many cylinders must extend at the same time with high precision.
When the hydraulic cylinder expands and contracts in a lame manner, this causes the inclination of the blade and the difference in pressing force depending on the location, resulting in a decrease in plate bending accuracy. In addition, when pressing force is constantly applied to the entire surface of the blade using the above cylinder, if the width of the plate is smaller than the width of the blade, the blade may curve and the bending line of the plate may not be accurately aligned. There is also.

The above problem can be solved by moving the blade up and down and also moving it back and forth to split the plate material into two parts.
A type of plate bending machine that bends in stages (for example, Japanese Patent Application Laid-Open No. 56
This phenomenon tends to be more noticeable in bending operations where the width of movement is small and there is no working surface to counter the bending force, such as a counter blade, such as in the back-and-forth movement of the blade in No. 39121).

Therefore, this invention is intended to solve the above-mentioned problem in a type of plate bending machine that bends a plate by moving the blade not only in the vertical direction but also in the front-back direction, where the above-mentioned problems tend to occur.

Below, based on the drawings, we will show an example in which the pressing device of this invention is installed on a plate bending machine in which the tip side of the bending blade can swing not only in the vertical direction but also in the direction of approaching and separating from the counter blade (back and forth direction). explain.

FIG. 1 is a perspective view of the plate bending machine 1, and FIG. 2 is a perspective view with the blank holder 2 and counter blade 3 removed. The plate bending machine 1 has a C-shaped frame 4,
It has a blank holder 2 which is supported by the frame 4 and is movable in the vertical direction, a counter blade 3, and a cutter block carriage 7 which is movably guided in the vertical direction and has bending blades 5 and 6 above and below. .

The cutter block carriage 7 is a hydraulic cylinder 8
The seat 9 is moved vertically by the
Guided by.

The cutter block carriage 7 has a C-shaped cross section and the upper and lower folding blades 5, 6 are connected to the upper and lower arms 7a, 7b of the cutter block carriage 7 in the manner described below.

That is, FIG. 3 is a cross-sectional plan view of the folding blade 6 portion, FIGS. 4, 5, and 6 are longitudinal sectional side views of each part of FIG. 3, and FIG. 7 is a view taken along the arrow in FIG. The bending blade 6 is rotatably mounted on a horizontal journal 11 supported by a lower arm 7b of a cutter block carriage 7, and an operating portion 6a at the tip thereof can be moved toward and away from the counter blade 3. ing.

The folding blade 6 has a plurality of blocks arranged in recesses 14 and 15 provided longitudinally in the opposing walls 12 and 13 of the folding blade 6 and the lower arm 7b of the cutter block carriage 7, respectively. It is supported on the journal 11 in the form of a pintle by the pair 16,17.

That is, the swinging angle of the operating portion 6a at the tip of the bending blade 6 about the journal 11 is set to a displacement angle θ (FIG. 4), and the swing angle θ is parallel to the blade 6 for adjusting the displacement angle θ. , wedges 19 and 21 which can be freely inserted and removed in the left-right direction and whose width changes in the longitudinal direction as shown in FIG. 3 are provided as follows.

A bracket protrusion 18 is provided on the portion of the bending blade 6 facing the cutter block carriage 7, and a rod-shaped wedge that is in sliding contact with the bracket protrusion 18 is longer than the bending blade. 19 and 21 are arranged. The bar-shaped wedges 19, 21 have inclined sides 22, 23 or wedge faces facing the cutting block carriage 7 and vertical sides which are held in sliding contact with the vertical sides of the folding blade 6. 2
4,25.

The bending blade 6 is movable in the front-back direction along a plurality of holes 26 formed in the blade 6 in the longitudinal direction. Each hole 26 has an annular shoulder 2
6a is formed, and a stud bolt 28 inserted into the cutter block carriage 7 is inserted through a laterally elongated hole 27 formed in the wedge 21, and inserted into the hole 26. A disc spring 29 is interposed between the head of the stud 28 and the shoulder 26a to bias the bending blade 6 counterclockwise in the drawing.

31 is the counterclockwise stopper; 32
3 is a pin slidably provided in the stopper 31, and 33 is a spring for urging the pin 32 to protrude.

On the other hand, a large number of cylindrical recesses 34 are bored in the cutter block carriage 7 along the longitudinal direction between the positions where the stud bolts 28 are provided, and a cylinder 35 is inserted into the recess 34. is fixed.

The cylinder 35 has a flange portion 35a in contact with the inner wall of the cutter block carriage 7, and the flange portion 35a of each cylinder 35 is attached to the cutter block carriage 7 by a different distance for each cylinder.
It is made to stand out from the outside.

That is, in FIG. 3, the cylinder 35 on the right side is protruded to a larger extent, and its piston 3
The tip of the rod-shaped wedge 21 is aligned with the inclined side surface 23 of the rod-shaped wedge 21, that is, on a straight line parallel to the wedge surface.

A substantially hemispherical intervening member 37 is provided at the tip of each piston 36 and can be freely angularly displaced along the spherical surface within a small angle, and the flat surface on the other side of the intervening member 37 is It is in sliding contact with the inclined side surface 23 of the rod-shaped wedge 21.

Further, the wedge 19 and the wedge 21 are in sliding contact.

The stopper 31 is also arranged on a straight line parallel to the inclined side surface 22 of the wedge 19, so that its protruding width increases toward the right side in FIG. At position 31, a dedicated cylinder 38 is provided which is used only when adjusting the displacement angle θ of the bending blade 6 as described below.

That is, in FIG. 6, 38 is a cylinder provided in a recess 39 formed in the cutter block carriage 7, and a stopper 31 is fixed to a flange portion 38a of the cylinder 38.

A hemispherical interposition member 42 similar to the piston 36 is provided at the tip of the piston 41. and is fixed to the bending blade 6 with a bolt 45,
The tip of a spacer 44 that protrudes through an elongated hole 43 formed in the rod-shaped wedge 21 is in contact with the flat surface of the interposed member 42 .

That is, when the piston 41 moves forward, the bending grade 6 is pushed forward via the spacer 44, and the rod-shaped wedges 19, 21 are moved to the stopper 31 and the interposed member 37 at the tip of the piston 36, respectively.
The contact state between the two parts is released, and a small gap is created between them, allowing them to move freely along the longitudinal direction.

Next, the device for moving the rod-shaped wedges 19, 21, that is, the device for inserting and removing them in the left-right direction, will be described. Reference numeral 46 denotes a support frame for the cylinders 48, 49 fixed to the bending blade 6 via a support bracket 47; Rods 51 of two cylinders 48 and 49 supported in a trunnion type on this support frame 46,
One end of the elongated wedge 19, 21 is connected to the 52 end, respectively.

Reference numerals 53 and 54 denote connecting members, respectively, and the connecting members 53 and 54 abut against stopper pins 55 and 56 provided at intermediate positions of the support bracket 47, thereby regulating the maximum retracted positions of the rods 51 and 52. Ru.

57 is a support frame for stopper pins 55 and 56;
8 is a stopper plate on the tip side of the bar-shaped wedges 19, 21, 59 is a support bracket connecting the stopper plate 58 to the blade 6, and 61 is a presser for the stopper pin 62.

Next, the hydraulic circuit of the large number of cylinders 35 and 38 will be explained. As shown in FIG. Hydraulic pipes provided at symmetrical positions are connected 65 and connected to the same directional switching valve 63.

The hydraulic circuit of the hydraulic cylinder 38 is also connected to one directional control valve 64 through a connection 66 . Both of the directional control valves 63 and 64 are switched by solenoids.

The above plate bending machine equipped with the blade pressing device of this invention operates as follows.

The bending blade 6 is made angularly displaceable around the longitudinal axis of the journal 11 within a displacement angle θ adjusted and regulated by the wedges 19, 21, and the disc spring 29 acting on the bending blade 6 is When the elastic force is greater than the force acting on the cylinder 35, the angular displacement is counterclockwise in FIGS. 4 to 6, and when the force acting on the cylinder 35 is greater than the elastic force of the disc spring 29, the angular displacement is clockwise.

In addition, by moving the bar-shaped wedges 19, 21 whose widths change in the longitudinal direction parallel to the blade 6 in the left-right direction using the moving device that is the device for inserting and removing them in the left-right direction, the corner of the bending blade 6 can be bent. The magnitude of displacement can be changed.

That is, the wedge 19 is used to set the initial state of the blade 6 by moving it in and out from the left and right along the blade 6. The distance between the tip and the tip can be adjusted.

Furthermore, by moving the wedge 21, the extrusion restriction for the cylinder that urges the blade 6 forward is corrected, and the extrusion position of the blade 6 by the cylinder, that is, the position of the broken line of the blade tip 6a in FIG. 4 is determined. Become. In other words, the wedge 21 is used to adjust the amount by which the blade 6 is pushed forward during the bending process.

Next, the plate bending operation of the plate bending machine will be explained. First, in order to bend the plate material W upward, first,
In Fig. 4, the cutter block carriage 7 having the upper and lower bending blades 5 and 6 is moved upward so that the blade 6 faces the plate W held between the counter holder 3 and the blank holder 2, thereby bending it upward. The operating portion 6a of the blade 6 pushes the plate W protruding from the holder 3 upward, and the plate W is bent by a gentle angle. When the cutter block carriage 7 completes raising, the cylinder 35 placed behind the blade 6 extends and pushes the blade 6, and the working part 6a of the blade 6 moves forward and presses the plate W. The plate W is bent even deeper. This completes the upward bending process. The cylinder 35 is then shortened and the cutter block carriage 7 is lowered to a position where the blade 6 no longer interferes with the plate W. After that, to further bend the plate W downward, move the plate W forward, lower the cutter block carriage 7,
The plate W is pressed downward by the downward bending blade 5 to perform the bending process. The bending operation is performed in this way.

Furthermore, the operation of this plate bending machine will be explained in detail.

Prior to sheet bending, the displacement angle θ of the bending blade 6 is first adjusted.

That is, the switching valve 63 is switched to discharge all the pressure oil in the cylinders 35, and the cylinder 38 causes the piston 41 to extend. Then, the bending blade 6 moves slightly forward against the disc spring 29 via the spacer 44, so that a gap is created between the wedges 19, 21, the stopper 31, and the intervening member 37.

At that time, the cylinders 48, 49 of the moving device
is operated to insert and remove wedges 19 and 21 connected to each cylinder 48 and 49 in the left-right direction. In other words, the wedges 19 and 21, whose widths change along the longitudinal direction, are moved in the left-right direction to a location having a width where a desired swing angle displacement angle θ is to be obtained.

When the movement of the wedges 19 and 21 is completed in the above manner, the piston 41 of the cylinder 38 is moved backward, the bending blade 6 is energized by the disc spring 29, and the wedge 19 comes into contact with the stopper 31. Return to the most angularly displaced state in the counterclockwise direction in FIGS. 4-6.

At this point, the plate bender is ready to perform the desired upward bending operation.

To perform the upward bending operation, the following sequence of operations is performed.

That is, the working portion 6a of the bending blade 6
is retracted to the corner 3a of the counter blade 3 by a predetermined amount depending on the dimensions of the entire bending operation, as described above.
Next, when the cutter block carriage 7 rises and the working part 6a of the folding blade 6 presses the board W upward, the board W is bent by a gentle bending angle whose value is correlated to the retracting distance of the working part 6a. is bent.

When the cutter block carriage 7 completes its ascent, the switching valve 63 is electrically switched by a solenoid at the same time, the cylinders 35 simultaneously extend, and the bending blade 6 is pushed through the intervening member 37. The active part 6a is angularly displaced to the end position of the clockwise travel set by the position of said wedge 21.

That is, as shown in FIG. 6, the blade 6 is pushed forward by the cylinder and moved by the distance between the wedge 21 and the hemispherical intervening member 42.

In addition, the cylinder 3 that is extended during the above operation
5 is appropriately selected depending on the horizontal width of the plate material.

In other words, when the width of the plate to be handled is as wide as the length of the blade 6 in the longitudinal direction, all the cylinders 35 are extended to apply forward pressure to the entire surface of the bending blade 6. The plate material W is bent, but if the width of the plate material is narrow, the plate material W is inserted into the center of the blade 6, and only the cylinders 35 near the center are selectively extended (that is, the switching valves 63, only the one connected to the cylinder 35 near the center is switched) bending blade 6
The plate material W is bent by applying forward pressure only to the back surface of the central portion.

As a result of this angular displacement, the edge of the plate W is bent deeper than the angle at which it was originally bent, and the bending operation is completed, but the extension operation of the cylinder 35 is caused by the bending blade as described above. The cylinders 35 arranged in rows along the blade 6 are connected to the same directional switching valve 63 at symmetrical positions with respect to the center of the blade 6, so that the directional switching valve 63
If the cylinders 35 are switched at exactly the same time, the connected cylinders 35 will definitely extend at the same time, and therefore all the cylinders 35 as a whole will extend exactly at the same time.

Even if the switching of the directional control valves 63 does not take place exactly at the same time, the connected cylinders 35
The cylinders 35 extend exactly at the same time, i.e. the cylinders 35 are symmetrically located around the center of the blade 6.
blade 6 because they always operate exactly at the same time.
There has never been a case where the cylinder moves in an inclined state, especially when the stroke of the cylinder 35 is small and the capacity of the cylinder 35 is small, as described above.
Even if the expansion and contraction time of the cylinder 35 itself is short, the blade 6 can be moved accurately in a parallel state without rattling or the like.

In addition, in the pressing device of the present invention, as described above, the hydraulic cylinder 35 can be moved forward and backward in a section of any width around the center of the blade 6, so that the forward pressing force is applied only to the back surface of the blade 6 in a section that matches the width of the plate material. Compared to other pressing devices that always apply pressing force to the entire back surface of the blade regardless of the width of the plate, the blade does not bend during pressing, and therefore the bending line of the bent plate does not change. It has an excellent advantage of high linearity, and this advantage is particularly effective when, in the above-mentioned plate bending machine, the tip of the bending blade 6 moves forward to bend the plate material W in a direction where the counter blade 2 does not exist. It is demonstrated as.

As is clear from the above explanation, the pressing device according to this invention can be used in the above-mentioned type of plate bending machine that moves the blade not only in the vertical direction but also in the front and back directions to bend the plate material in two stages. This can prevent problems such as those caused by poor straightness of the bent edges.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a plate bending machine equipped with the blade pressing device of this invention, Fig. 2 is a perspective view of the same with the blank holder and counter blade removed;
Fig. 3 is a cross-sectional plan view of the bent blade portion with the wedge omitted (cross-section taken along the - line in Fig. 2), Fig. 4 is a longitudinal cross-sectional side view of the cylinder 35 portion, and Fig. 5 is the stopper 31 and stud 28 portion. vertical side view of
FIG. 6 is a vertical sectional side view of the cylinder 38 portion, FIG. 7 is a cross-sectional view of FIG. 3, FIG. 8 is a front view of the wedge moving device with the support bracket shown in chain lines, and FIG. It is a hydraulic circuit diagram. 1...Plate bending machine, 2...Blank holder, 3...
Counter blade, 6...Bending blade, 6a
...Action part, 7...Katsuta block cartridge,
11... journal, 19, 21... wedge, 3
5... Cylinder, 63... Directional switching valve, 65...
Connection, θ...Displacement angle, W...Plate material.

Claims (1)

[Scope of utility model registration request] In a plate bending machine, the tip of a bending blade provided on a cutter block carriage that is driven up and down presses against a plate material held under narrow pressure between a counter blade and a blank holder to bend the edge of the plate material, A bending blade is provided swingably around a horizontal journal on the cutter block carriage, and the bending action portion, which is the swinging tip of the bending blade, is movable approximately in the front-rear direction toward the counter blade. The swinging angle of the bending action portion of the bending blade about the journal is set to a displacement angle θ, and the back surface of the bending blade has a range of the displacement angle θ. A plurality of hydraulic cylinders are arranged along the longitudinal direction of the blade, and the oil passages of the hydraulic cylinders are located at symmetrical positions with respect to the center of the blade. 1. A blade pressing device for a plate bending machine, characterized in that the blades are connected to the same switching valve.