JPS6222728B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a workpiece support device, and more particularly to a workpiece support device that supports the lower surface of a workpiece to be cut by a shearing machine and prevents deformation of the workpiece.

Conventionally, in shearing machines, cylinders have been used as a device to support the cutting part of the workpiece, or the elastic force of a spring has been used, but when a cylinder is used, the supporting position is limited, so cutting The position is also limited, and when a spring is used, there is a risk that the workpiece will be thrown up immediately after cutting.

The present invention was devised in view of the above-mentioned problems, and provides a workpiece support device that can successively correct deformation of a workpiece during cutting and improve cutting accuracy.

To achieve this objective, the present invention is provided below the upper blade in a shearing machine,
A work support plate is formed in an arc shape with an upper surface protruding in the longitudinal direction of the upper blade, and the work support plate is configured such that the position of supporting the lower surface of the work during cutting on the work support plate moves sequentially with the cutting position. A drive mechanism for controlling rotation of the support plate is provided.

Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a schematic side view of the shearing machine 1, which is equipped with an upper blade 3 that can move up and down and a lower blade 5 fixed to the machine base, and a workpiece support device 7 is arranged below the upper blade 3. has been done.

Next, the workpiece support device 7 will be explained using FIGS. 2 and 3.

A workpiece support plate 9 is disposed below the upper blade 3 and faces in the direction in which the upper blades 3 are connected, and the upper surface 11 of this workpiece support plate 9 has an arc shape that projects in the longitudinal direction of the upper blade 3. It is formed. Then, in synchronization with the lowering of the upper blade 3 to cut the workpiece W, the workpiece is supported so that the position where the arcuate upper surface 11 supports the workpiece W during cutting moves from right to left in FIG. The plate 9 rotates while being guided by the center guide 15 and the end guides 17.

As understood from FIGS. 2 and 3, the workpiece support plate 9 described above rotates in a vertical plane parallel to the shear line of the workpiece W by the upper blade 3 and the lower blade 5. The rotation of the workpiece support plate 9 is performed by two cams 21 serving as drive mechanisms that rotate while contacting the lower end of a plate thickness adjustment mechanism 19 mounted on the lower part of the workpiece support plate 9.

The plate thickness adjustment mechanism 19 is equipped with an elastic body 23 such as a disc spring inside so that it can cope with the impact that the workpiece support plate 9 receives when cutting the workpiece W and the change in plate thickness. The rod 24, which is internally movable vertically, is biased downward in order to cope with changes in the force exerted on the workpiece support plate 9 depending on the thickness of the workpiece W. Furthermore, a rotating body 25 is provided at the lower end of the rod 24 in the plate thickness matching mechanism 19 that comes into contact with the cam 21.

A wire 2 is attached to the lower center end of the workpiece support plate 9.
A cylinder 29 for preventing the workpiece support plate 9 from floating is connected via the cylinder 7 and urged downward.

A driven pulley 31 is coaxially connected to the cams 21 having different phases, and a belt 33 is wound between the two driven pulleys 31. Further, one of the driven pulleys 31 is coaxially provided with a connecting gear 35 as a bevel gear (see FIG. 3), and the rotation of the connecting gear 35 is controlled by the connecting gear 37 as a bevel gear, the connecting shaft 39, and the driven pulley 4.
1. This is performed by a drive pulley 45 via a belt 43. The drive pulley 45 is driven by a drive shaft 47 of the shearing machine 1 main body. Therefore, the vertical movement of the upper blade 3 and the cam 2
The rotations of 1 are performed synchronously.

Next, in order to determine the shape of the cam 21 so that the workpiece support plate 9 can be rotated as described above, the locus of the working part shown in FIG. It is necessary to calculate as follows.

In FIG. 4, ~' and ~' are the loci of movement of the acting part, but when applied to an actual shearing machine, the horizontal x
The directional movement is negligible. Therefore, only movement in the vertical y direction needs to be considered.

Vertical movement is expressed by the following equation. (5th
(See figure) y=R−R′cos(α−θ)〓 R…Workpiece support plate arc radius [mm] R′…Distance from the workpiece support plate arc center to [mm] α…Rear from the initial position Phase angle [radian] θ... Workpiece support plate rotation angle [radian] As shown in FIG. pass line 4
9, the contact portion between the circular arc portion and the pass line 49 moves from right to left in the figure in synchronization with the upper blade 3.

Here, the dimension A in FIG. 6 is selected, and the radius R of the workpiece support plate 9 is determined. θs is the shear angle. Point P in FIG. 6 is the position where the workpiece support plate 9 supports the workpiece W, and the upper blade 3 and the workpiece support plate 9 are in contact with each other, and the workpiece W exists between them.

Work support plate 9 that supports the work W during cutting
The arc portion moves along the pass line 49 of the main body of the shearing machine 1 and contacts the pass line 49 and the upper blade 3 at points P and Q in FIG.

Now, the stroke amount S of the upper blade 3 and the workpiece support plate 9
By determining the relationship between the rotation angle θ and the rotation angle θ, the y coordinates of and in FIG. 4 at each position of the upper blade 3 can be calculated.

When the cam 21 is used as the drive mechanism, the stroke amount S of the upper blade 3 is converted into the rotation angle θ of the drive shaft 47, and each mechanism quantity can be determined by using the y coordinate as the radius of the cam 21.

Letting x be the distance from the initial position to point Q, the following equation holds true.

x=S/tanθs+x' ... Approximately x=S/tanθs+A/2 ... θ=x/R ... Therefore, y becomes a function of S, and from the formula, y=f(S)=R −R′cos {α−(S/tanθ ₂ +A/2)/R} By analyzing the above relationships, the workpiece support plate 9 can operate smoothly. In short, as the upper blade 3 descends and the stroke amount S increases, y, that is, the position in the vertical direction with respect to the action part of the workpiece support plate 9 is determined. Therefore, it is only necessary to set the shape of the cam 21 to correspond to this y.

In the above configuration, the workpiece W is set in the shearing machine 1, the upper blade 3 is lowered to shear the workpiece W, and the upper blade 3 and the lower blade 5
The workpiece W is cut with.

On the other hand, the drive shaft 47 of the shearing machine 1 body
The drive pulley 45 rotates due to the rotational drive of the driven pulley 3, and the driven pulley 3
1 rotates, the other driven pulley 31 also rotates in conjunction with the belt 33. Driven pulley 31
The rotation causes the cam 21 to rotate in the direction of the arrow in FIG.

As the cam 21 rotates, the upper surface 11 of the workpiece support plate 9 is rotated to prevent the workpiece W from curving downward when cutting the workpiece W, via the plate thickness adjustment mechanism 19 that is in contact with the upper surface of the cam 21. work W
While moving in the cutting direction, the workpiece support plate 9 is guided by the center guide 15 and the end guide 17, and the center lower end is pulled downward by the cylinder 29 via the wire 27 to prevent the workpiece support plate 9 from floating. Then, the workpiece support plate 9 rotates.

In this way, deformation of the workpiece during sequential cutting is corrected simultaneously with the cutting process.

As described above, in this invention, below the upper blade of the shearing machine, the contact part with the workpiece that supports the workpiece in order to prevent the workpiece from curving when cutting the workpiece is provided with an arcuate upper surface that moves simultaneously with the cutting position. Since the work supporting plate having the above-mentioned structure and the drive mechanism capable of moving the work supporting plate as described above are provided,
The supporting position of the workpiece during cutting is not limited, and the workpiece can be successively corrected at the same time as the workpiece is cut, resulting in improved cutting accuracy.

It should be noted that this invention is not limited to the above-mentioned embodiments, and the invention can be implemented in modes other than the above-mentioned embodiments. For example, the drive mechanism for the workpiece support plate may be as shown in FIGS. 7 to 9. Figure 7 shows a drive mechanism for the workpiece support plate in which the drive shaft of the shearing machine main body is replaced with a hydraulic drive, from the drive shaft of the shearing machine body to the cam and plate thickness adjustment mechanism, with 51 being a power amplifier and 53 being an electro-hydraulic servo valve. It is. In FIG. 8, the part from the drive shaft of the shearing machine main body to the cam is replaced with a servo motor drive, and 55 is a servo motor. In addition, in Figure 9, the shape of the cam is determined so that the surface in contact with the plate thickness adjustment mechanism is formed into a mountain shape, and when moving the cam on the right side in the figure to the right (left) direction, the cam on the left side ) The workpiece support plate is rotated by simultaneously moving the workpiece support plate in the direction ( ), and 57 is a cam.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of the shearing machine, Figure 2
3 and 3 are a front view and a plan view of the workpiece support device, FIGS. 4 to 6 are diagrams used to determine the vertical position of the workpiece support plate in order to determine the shape of the cam, and FIG. 9 to 9 are explanatory diagrams of other embodiments. Explanation of the symbols representing the main parts of the drawing, 3...
Upper blade, 5... Lower blade, 9... Work support plate, 21...
…cam.

Claims (1)

[Claims] 1 In the shearing machine 1, the upper blade 3 which cooperates with the lower blade 5 fixed to the machine base to shear the workpiece W is provided to be movable up and down, and the upper blade 3 is tilted appropriately with respect to the lower blade 5. A work support plate 9 is provided adjacent to the lower blade 5 and extends in the direction along the lower blade 5, and a work support plate 9 is provided facing the upper blade 3, and the work support plate 9 is provided adjacent to the lower blade 5. The work support plate 9 is rotatably provided in a vertical plane parallel to the shear line of the work W by the lower blade 3 and the lower blade 5,
The upper part of the workpiece support plate 9 is formed in an arc shape protruding toward the upper blade 3 side, and the position where the workpiece support plate 9 supports the workpiece W from below is set to the upper blade 3 side.
and the position in which the workpiece W is sheared by the lower blade 5, and in such a manner that the position at which the workpiece support plate 9 supports the workpiece W moves in accordance with the movement of the shearing position of the workpiece W. A workpiece support device comprising a drive mechanism for rotating a workpiece support plate 9.