JPH0418965B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Application Field The present invention relates to mechanical shears, and more specifically, a groove is provided on the upper surface of the ram, one end of which is engaged with the groove, and the other end of which is engaged with the lower end of a connecting rod. This invention relates to a mechanical shear which is provided with swingably connected blocks, a spacer that can move in and out between the bottom of the groove and the block, and a drive device that drives the spacer in and out.

b. Prior Art In general, a mechanical shear is a cutting machine in which a ram equipped with a movable upper blade moves up and down between top dead center and bottom dead center using a crankshaft or an eccentric mechanism to perform shearing work.

This mechanical shear or a so-called blanking shear in which a blade is bent at a right angle at a certain distance (this name comes from the fact that the desired material such as a rectangle is obtained by cutting two sides of a rectangle at once) is used. If you want to cut a shearing length that is longer than the length of the blade on one side, you will have no choice but to rely on cutting.

That is, a method is adopted in which shearing is temporarily stopped without cutting to the end of the blade, the movable blade is opened, and the material to be cut is advanced to proceed with new shearing.

c Problems to be solved by the invention In this case, in the conventional mechanical shear, it is necessary to adjust the upper blade position at the bottom dead center to be higher, and it is extremely difficult to adjust the threading of the connecting rod and ball joint. There was the inconvenience of having to carry out a complicated and inefficient chase.

d Means for solving the problem In the device of the present invention, a spacer is interposed between the lower end of the connecting rod and the upper surface of the ram for general shearing work, and the spacer is removed for further shearing work. The height of the upper blade at bottom dead center was easily and quickly raised.

e Action As already clear above, the height position of the upper blade at the bottom dead center is easily and quickly adjusted to perform further cutting, and the height position of the upper blade at the bottom dead center is similarly returned to a lower position for general shearing. They now have a mechanical shear that allows them to return to work.

f Example First, an example machine implementing the apparatus of the present invention will be described with reference to FIGS. 4, 5, and 6.

The illustrated example machine is a multifunction machine 1 that can perform both punching and blanking operations, and as is clear from FIG. 5 are driven by a plurality of connecting rods by the same crankshaft or eccentric device.

A numerically controlled material positioning device 9 is located apart from the front table 7, and a plate gripping device 11 thereof is provided.

The roller device 13 that is most obvious in FIG.
This is a roller conveyor that transports semi-finished products that have been punched and cut on two sides at once.

The punching die group 3 described above is provided with a not-shown puncher or the like which can be moved and positioned freely in the longitudinal direction of the ram, and is positioned over a desired punching die to perform punching.

1, 2, and 3 show an embodiment in which the present device is provided between a ram 15 such as the blanking mold 5 illustrated in FIGS. 4, 5, and 6, and a connecting rod 17.

That is, two connecting rods 17 are provided on the crankshaft 21 provided on the upper frame 19 of the punching and blanking compound machine 1, and two connecting rods 17 are provided on each side of the connecting rods 17 as shown in FIG. A total of four vertical guide posts 23 are provided.

The blanking upper blade 25 is attached to the ram 15 via an upper blade holder 27, and the upper blade holder 2
7 is provided with a slide cylinder 29 that engages with the guide post 23.

A lower blanking blade 33 is attached to the lower frame 31 via a lower blade holder 35.

Further, as shown in FIG. 2, on both sides of the center of the upper frame 19 in the direction of the crankshaft 21, for example, fluid pressure balance cylinders 37 are provided, and the ram 15, upper blade holder 27, and blanking upper blade 25 are connected to each other. It is biased upward.

In this embodiment, there are two Ts apart on the upper surface of the ram 15.
A groove 39 is provided, and a T block 43 is provided, one end of which engages with the T groove, and the other end of which is pivotally connected to the connecting rod 17 by a shaft pin 41.

Below the T-block 43 mentioned above, there is a spacer 4 which can be freely inserted and removed between the bottom of the T-groove 39 and the T-block 43.
5 is provided, and a spacer drive device 47 such as a rotary actuator is provided at the upper center of the ram 15.
is provided.

The lower end of a cylinder 49 provided below the T-block 43 is always in contact with the upper surface of the spacer 45 due to the biasing force of the balance cylinder 37 described above.

As is clear from FIG. 3, in the vertical and horizontal centers of the upper surface of the ram 15, a rocking body 51 is provided in a substantially horizontal state, and is rocked at the center by a spacer drive device 47 such as a rotary actuator. The above-mentioned spacer 4 is connected by links 53, 53.
It is connected to 5.

Thus, as is clear from FIG. 2, the bottom of the T-groove 39 of the ram 15 comes into contact with the cylinder 49 at the lower end of the T-block 43 via the spacer 45, and directly with the cylinder 49. It is controlled so that it occupies a height position.

The second embodiment of the present invention is illustrated in FIGS.
1 and swings up and down, so there is no guide post 23 in the first embodiment.

In this embodiment, the lower part of the connecting rod 17 also serves as the T block 43, and the eighth
As is clear from the figure, an arcuate portion 57 is provided at the upper shoulder portion of the T-groove 39, and an arcuate portion 59 that contacts the spacer 45 is provided at the lower portion of the cylinder 49.

In both of the above-mentioned embodiments, the shearing starts from the right end side of the shearing blade of the blanking upper blade 25 (the right end in FIG. 1, the right end in FIG. 7), moves to the respective left end, and at the left end, the shear Change direction and move toward the far end of the horizontal blade (the right end in Figures 2 and 8).

Therefore, when the spacer 45 is pulled out from the bottom of the T-slot 39 and the lower end of the cylinder 49 or the circular arc portion 59 under the cylinder directly contacts the bottom of the T-slot 39, the blanking upper blade 25 at the bottom dead center of the crankshaft 21 The height position becomes higher.

In this way, the shearing can be stopped and the entire upper blade can be returned to the upward position before the shearing by the front blade is completed as described above.

g. Effects of the invention As is clear from the details already described, in the mechanical shear embodying the technical idea of the present invention, shearing is interrupted at the bottom dead center position of the crankshaft or eccentric device, and the upper blade is raised and returned. be able to.

Therefore, by easily operating a simple mechanism, it was possible to temporarily interrupt the shearing operation and easily carry out further cutting, making it possible to realize a highly efficient mechanical shear.

It is also clear that design changes can be easily made without departing from the technical idea of the present invention.

[Brief explanation of drawings]

Fig. 1 is a partial cross-sectional front view of the upper surface of the ram of the mechanical shear of the present invention, Fig. 2 is a partial cross-sectional view of the right side of Fig. 1, Fig. 3 is an explanatory diagram of spacer movement, and Fig. 4 is a main 5 is a right side view of FIG. 4, FIG. 6 is a plan view of FIG. 4, and FIG. 7 is an implementation of FIG. 2 corresponding to FIG. 1. The front view of the example, FIG. 8, is a right side view of FIG. 7 and corresponds to FIG. 2. Explanation of the symbols representing the main parts of the drawings, 1...Punching blanking multifunction machine, 3...Punching die group, 5...Blanking die, 15...Ram,
25...Blanking upper blade, 33...Blanking lower blade, 37...Balance cylinder, 39...T
groove, 43...T block, 45...spacer,
47...Spacer drive device.

Claims (1)

[Scope of Claims] 1. A groove is provided on the upper surface of the ram, and a block is provided, one end of which engages with the groove and the other end of which is swingably connected to the lower end of the connecting rod, and the bottom of the groove and the block are provided. A mechanical shear characterized in that a spacer that can be freely moved in and out is provided in between, and a drive device that drives the spacer in and out. 2. A patent claim characterized in that the spacer drive device is a rotary actuator provided at the center of the upper surface of a large ram of a double crank press, and two links provided at both ends of a rocking body that swings at the center. The mechanical shear according to item 1.