JPH052443B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a shearing press device, and more particularly to a press device for shearing a long workpiece having a substantially U-shaped or inverted U-shaped cross section.

BACKGROUND ART Conventionally, when cutting a channel material 1 as shown in FIG.
Usually, the channel material 1 is sheared by arranging it in a letter shape and lowering the cutting blade of a press device (not shown) from above. However, according to the above method, since the cut surface of the channel material 1 extends in the direction of movement of the cutting blade, there is a problem that burrs 2 are generated around the cut surface, deteriorating the quality.

In order to deal with the above problem, attempts have been made to eliminate the occurrence of burrs by dividing the shearing process into two steps. That is, Figures 9 to 11
The figure shows the shearing means by a ground cam,
As shown in FIG. 9, only the bottom surface of the channel material 1 is sheared to form a notch 3, and then the 10th
As shown in the figure, the channel material 1 is formed into an inverted U shape and sheared along line A from both sides. 11th
The figure schematically shows the above-mentioned shearing mode, in which the cutting blades 6, 6 are mounted on the opposing surfaces of the sliders 5, 5 that can freely slide on the lower die shoe 4. When the cam drivers 7, 7 fixed to the outer upper mold shoe descend, the cutting blades 6, 6 approach from both sides of the channel material 1, which has been set on the lower blade in advance, and line A in FIG. Shear along. 8,
8 is a spring that applies an equal reaction force to the sliders 5, 5.

Further, FIGS. 12 and 13 show the shearing means using a flying cam. First, as shown in FIG. 12, a notch 9 is provided in the center of the channel material 1, and shearing is performed from both sides along line B. . That is, as schematically shown in FIG.
The channel material 1 is placed on the lower die cutting blade 11 fixed to the cam driver 1 adjacent to the lower die cutting edge 11.
Fix 2 and 12. On the other hand, slidable sliders 14, 14 are provided on the upper mold shoe 13, and cutting blades 15, 1 are provided on opposing surfaces of the sliders 14, 14.
Attach 5. 16 is an elastic body such as a spring interposed between the cam sliders. With the above configuration, when the upper mold shoe 13 is lowered, the slider 14
The channel material 1 can be sheared by the cutting blade 15 by changing the moving direction from arrow C to D by the action of the cam driver 12.

Problems to be Solved by the Invention However, although such conventional channel material shearing means eliminates the occurrence of burrs and improves quality, the shearing process requires two steps. Therefore, it is not only inefficient, but also has drawbacks such as an increase in the cost required for mold production. Furthermore, when the channel material 1 is sheared only by the shearing means using the flying cam shown in FIG. 13, for example, there is a problem that an uncut portion is generated approximately in the center of the channel material 1. That is, since the slider 14 moves in a direction that is a combination of the downward direction shown in C and the horizontal direction shown in D, the cutting blade 15 fixed to this slider 14 eventually moves diagonally downward. Therefore, as shown in FIG. 13, the trajectory of the cutting edge 15 relative to the channel material 1 can be represented by E and E shown in FIG. 14, and these trajectories E and E are directed diagonally downward relative to each other. Both cutting blades 15, 15 are in contact and the channel material 1
Assuming that the channel material 1 is cut, a region 17 above both the trajectories E and E remains as an uncut portion of the channel material 1. Therefore, with the flying cam means, it is difficult to cut the entire circumference of the channel material 1 in only one step, and therefore a step of forming the notch 9 shown in FIG. 12 is added.

Therefore, the present invention has a conventional cross section approximately U as described above.
The object of the present invention is to solve the problems that occur when shearing a character-shaped workpiece, and to provide a press device that can completely perform the above-mentioned shearing process in only one step. .

Means for Solving the Problems In order to achieve the above object, the present invention provides a shear type press device using the above-mentioned flying cam, in which the cam driver is movable in the vertical direction with respect to the lower mold shoe. In addition, an elastic body having elasticity greater than that of the elastic body interposed between the sliders is inserted into the space provided in the vertical direction between the cam driver and the lower mold shoe. That is.

Effect With the above configuration, when the upper die shoe and the lower die shoe are brought close to each other when shearing a workpiece having an inverted U-shaped cross section, the slider moves along the lower surface of the upper die shoe. First, the workpiece is slid in a substantially horizontal direction and sheared from a direction perpendicular to the axis of the workpiece using a cutting blade attached to a slider. At this time, the elastic body interposed between the cam driver and the lower die shoe has a larger spring constant than the elastic body interposed between the sliders, so it does not deform elastically, and only the elastic body interposed between the sliders deforms elastically. . Next, when the shearing process from the direction perpendicular to the axis of the workpiece is completed and the upper die shoe further descends, the elastic body inserted between the cam driver and the lower die shoe starts elastic deformation, causing the slider and cutting blade to The entire machine moves downward, and shearing is performed from above and below, including the uncut portion of the workpiece, so that the workpiece can be completely sheared in one step.

EXAMPLE The structure and operation of the shear press device according to the present invention will be explained below based on the drawings. Figures 1 and 2
The figure schematically shows an outline of a shearing press device showing an embodiment of the present invention, and numeral 21 in the figure is an upper die shoe that is fixed to a press body (not shown) and moves up and down. a pair of sliders 22 that can be moved horizontally along the lower surface of the shoe 21;
22 are provided. 23 is slider 22, 22
This is a cam-up plate that slidably supports the. The sliders 22, 22 have upper cutting blades 24, 24, which have an inverted L-shape on their sides, fixed to opposing parts, and are further provided in the middle of the sliders 22, 22 to apply an equal reaction force to both sliders. An elastic body 25 such as a spring is inserted.

On the other hand, 26 is a lower mold shoe fixed on the floor, and a punch 27 fixed on this lower mold shoe 26.
A lower die cutting blade 28 is provided on the upper side for placing a workpiece having a substantially inverted U-shaped cross section. The upper die cutting blades 24, 24 are horizontally separated from each other with the approximate center of the lower die cutting edge 28 as a boundary.

Furthermore, in the present invention, the cam driver 29 is movable in the vertical direction relative to the lower mold shoe 26.
29 is provided, and holes 30, 3 are provided in the vertical direction of the cam drivers 29, 29 and the lower die shoe 26.
The feature is that elastic bodies 31, 31 such as urethane rubber are inserted into the inside of the body. This elastic body 31,
The elasticity of the slider 31 is set to have a larger spring constant than that of the elastic body 25 inserted between the sliders 22, 22. In addition, 32 shown in FIG. 2 is a thrust receiver that guides the sliding movement of the slider 22, 33 is a pad that presses down the workpiece, 34 is a retainer, 35 is a spring that applies pressing force to the pad 33, and 36 is a storage for storing chips. It shows the box to be used. Furthermore, killers 37, 3 are installed at the end of the upper mold shoe 21.
7 is protruding, and the cam drivers 29, 29
The killers 37, 37 are configured to come into contact with the cam drivers 29, 29 when pressed downward. 38, 38 are slide plates fixed to the inclined surfaces of the cam drivers 29, 29.

The operation of the shear type press device according to the present invention will be explained below with reference to FIGS. 3 to 7. The device according to the present invention is bilaterally symmetrical, so for convenience, the operation will be explained only in the right half with center line 0 as the boundary.

First, as shown in FIG. 3, a workpiece 40 having a substantially inverted U-shaped cross section is placed on the lower die cutting blade 28. Next, based on the operation of the press body (not shown), the upper die show 2
As shown in FIG. 4, one end of the slider 22 comes into contact with a slide plate 38 fixed to the inclined surface of the cam driver 29. When the upper mold shoe 21 continues to descend further, the slider 22
begins to move in the horizontal direction along the lower surface of the upper mold shoe 21, but in addition to the above-mentioned movement in the vertical direction,
Combined with the movement in the horizontal direction, the object eventually moves diagonally downward as shown by arrow E. That is, in the above operation,
The elastic body 31 made of urethane rubber or the like has a large spring constant and is not easily elastically deformed, whereas the elastic body 25 made of a spring or the like has a small spring constant and is easily elastically deformed.
The direction of movement will be changed from the vertical direction to the direction shown by E in FIG.

Next, as shown in FIG. 5, the side end of the upper die cutting blade 24 fixed to the slider 22 comes into contact with the workpiece 40 and starts shearing. At this time, as shown in FIG. 5, shearing is performed from the side portion of the inverted U-shape constituting the workpiece, and no shearing is performed from the upper wall portion. When the upper die cutting blade 24 moves to the position shown in FIG. 6 and shearing is performed, the elastic deformation of the elastic body 25 reaches its limit and the upper die cutting blades 24 come into contact with each other, so that the slider 22 The direction of movement is changed again to the direction of arrow F, that is, the up and down direction. At this time, the upper mold
A carrier 37 protruding from the end of the cam driver 29 contacts the upper surface of the cam driver 29 and transmits the pressing force of the upper mold shoe 21 to the cam driver 29. the result,
The elastic body 31, such as urethane rubber, starts to undergo elastic deformation, and the upper die cutting blade 24 descends as shown in FIG. Perform shearing. At this time, the elastic body 31
directly receives the pressing force of the upper die shoe 21 and is elastically deformed. FIG. 7 shows a state in which the upper die shoe 21 has completely descended, that is, has reached the bottom dead center.
When the shearing of the workpiece is completed as described above, the upper mold shoe 21 is raised again, and the elastic bodies 31 and 25 are
The cam driver 29 and slider 2
2 is returned to the state shown in FIG. 3, and the sheared workpiece 40 can be taken out. In addition, in order to stabilize the workpiece 40 during operation, a spring 35 is installed.
The pad 33 presses the upper surface of the workpiece 40 from above by the pressing force.

As explained in detail above, the shearing process of the workpiece includes two steps, and the above two steps can be sequentially performed within one reciprocation of the vertical movement of the upper mold shoe 21. This ability constitutes an operational feature of the device of the present invention. Therefore, the result is the same as if the shearing process were completed in only one process.

Effects of the Invention According to the present invention described above, the following effects are brought about. In other words, when shearing a workpiece such as a channel material with a substantially U-shaped cross section in a direction perpendicular to the axial direction, the workpiece can be completely sheared without leaving any uncut parts by just one reciprocating press operation. Shearing can be performed to Therefore, there is no need for pre-processing such as making notches in advance on the workpiece, or complicated operations such as dividing the shearing process into two steps, resulting in improved workability. It can improve productivity and reduce costs. In addition, the movement of the upper die cutting blade is basically diagonally downward, which prevents or significantly reduces the occurrence of burrs on the cut surface when cutting the workpiece. It also has the effect of simplifying the work.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing the configuration of a shear press device according to the present invention, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIGS. 8 is a perspective view showing a conventional shearing state of a workpiece; FIGS. 9 and 10 are perspective views illustrating an example of a conventional shearing method; FIG.
The figure is a schematic cross-sectional view showing an outline of a conventional shear-type press device, Fig. 12 is a perspective view illustrating another example of a conventional shearing method, and Fig. 13 shows an outline of another conventional shear-type press device. A schematic cross-sectional view, FIG. 14, is a cross-sectional view showing a state in which a workpiece is cut by a conventional device. 21...Upper model shoe, 22...Slider, 2
4...Upper die cutting blade, 25, 31...Elastic body, 26...
...Lower die shoe, 27...Punch, 28...Lower die cutting blade, 29...Cam driver, 32...Thrust receiver, 33...Putt, 34...Retainer, 3
5... Spring, 36... Box, 37...
Killer, 38...slide plate.

Claims (1)

[Claims] 1. An upper die shoe and a lower die shoe that are relatively close to each other and move away from each other, a lower die cutting blade that is fixed to the lower die shoe and on which a workpiece having an approximately inverted U-shaped cross section is placed, and the lower die cutting blade A pair of sliders that are separated horizontally as a boundary, move vertically as the upper mold shoe moves, and are mounted so as to be movable in the horizontal direction along the lower surface of the upper mold shoe, and opposing parts of the sliders. a pair of upper die cutting blades that are fixed to the workpiece and substantially follow the cross-sectional shape of one side of the workpiece; In the shear type press device, the lower die shutter is equipped with a cam driver that changes the moving direction from the vertical direction to the horizontal direction, and an elastic body that is interposed between the pair of sliders and applies an equal reaction force to both sliders. The cam driver is disposed so as to be movable in the vertical direction, and a spring constant larger than the spring constant of the elastic body is provided in the space provided in the vertical direction between the cam driver and the lower mold shoe. A shearing press device characterized by interposing an elastic body with a