JPH0450979Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an opposed die shearing device that has opposed dies and performs shearing with precision and a good finish.

[Prior Art] For example, Japanese Patent Publication No. 47-44107 discloses such an opposed die shearing device that applies compression and cutting deformation to a workpiece between opposing dies, one of which is a die with a protrusion, and then A press device has been proposed that uses a punch to separate the workpiece.

[Problems to be Solved by the Invention] According to the above-mentioned press device, precise shearing with a good finish is possible, but there is a problem that the equipment cost is high because it is a dedicated device.

The present invention is intended to solve such problems, and aims to provide an opposed die shearing device that can be incorporated into a general-purpose press device to easily perform shearing with opposed dies at a low cost.

[Means for solving the problem] The opposing die shearing device is a press slide S
(Fig. 1), a lower mold 3 fixed to a press bolster B facing the press slide S, and a flat die (hereinafter simply referred to as (referred to as die) 2 and the upper mold 1
and a punch 4 and hydraulic cylinders 5A, 5B provided on the other side of the lower die 3, and the hydraulic cylinders 5A, 5.
It is supported by the piston 51 of B and is positioned opposite to the die 2, and has a protrusion 61 having the same outline as the die 2 on the opposing surface, and the protrusion 61 is slidably fitted to the outer periphery of the punch 4. A die 6 with a projection is installed between the upper mold 1 and the lower mold 3,
a guide member 92 that slides and guides the die 2 and the die 6 with projections in the vertical direction;
and a hydraulic pressure switching means 8 (FIG. 4) that reduces the hydraulic pressure of the hydraulic cylinders 5A and 5B when the relative position falls below a predetermined value. .

[Function] Hereinafter, a case where the die 2 is provided in the upper die 1 and the punch 4 and the hydraulic cylinders 5A, 5B are provided in the lower die 3 will be described.

When a workpiece M is placed on the upper surface of the die 6 with protrusions and the press slide S is lowered, the die 2 descends along the guide member without shifting laterally, and the workpiece M is moved between the die 2 and the die with protrusions. It is held between 6 and 6 (Fig. 1). When the press slide S further descends, the periphery of the center of the workpiece M is compressively deformed between the protrusion 61 and the die 2, and the center enters the punch hole of the die 2, causing shearing deformation (Fig. 2). ).

At this point, when the relative position of the die 2 and the protruding die 6 becomes less than a predetermined value, the hydraulic pressure switching means 8 causes the hydraulic pressure of the hydraulic cylinders 5A, 5B to decrease.

When the press slide S further descends, the protruding die 6 moves down with the workpiece M sandwiched between it and the die 2 as the press slide S descends, and as a result, the punch 4 rises relatively. Then, the center part of the workpiece M is punched out and separated (FIG. 3).

[Effects] The shearing device of the present invention can provide an opposing die and a punch as a die set between the slider and the bolster of the general-purpose press device.
Shearing with high precision and a good finish can be performed easily and at a low cost.

[Example] In FIG. 1, a lower mold 3 is fixed on a bolster B, and cylinder chambers 5A and 5B are formed in two places on the left and right in the lower mold 3, and a piston 5 is movable up and down.
1 is provided. Hydraulic oil is supplied to each of the cylinder chambers 5A and 5B through an oil passage 52. A punch holder 41 is provided on the lower mold 3, and a columnar punch 4 is erected on the punch holder 41.

A die holder 62 is supported at the upper end of the piston 51, and the punch 4 is inserted through the center opening thereof. The die holder 62 moves up and down guided by sub guide posts 92 passing through its four corners. A die 6 with a protrusion is provided on the die holder 62 with its axis aligned with the opening. The protrusion-equipped die 6 has a protrusion 61 having the same outline as the die 2 on the surface facing the die 2 (to be described later), and the protrusion 61 is slidably fitted around the outer periphery of the punch 4.
The top surface of the protrusion 61 and the end surface of the punch 4 are on the same plane.

An upper mold 1 is fixed to the lower surface of a slide S that moves up and down, and the upper mold 1 moves up and down guided by guide posts 91 provided upright at the four corners of the lower mold 3. A die holder 21 is fixed to the lower surface of the upper mold 1, and a die 2 is fixed to the lower surface of the center thereof, facing the die 6 with projections. The die holder 21 is guided by the sub-guide post 92 and moves up and down.

A cylinder chamber 11 is formed in the upper mold 1, and a counter punch 12 is provided so as to be movable up and down, the tip of which is inserted through the center opening of the die holder 21 and positioned in the punch hole of the die 2. . die 2
The lower surface of the counter punch 12 and the tip end surface of the counter punch 12 are flush with each other. Hydraulic oil is supplied to the cylinder chamber 11 through an oil passage 13 .

A limit switch 7 is installed on the side of the die holder 21.
On the other hand, the die holder 62 is provided with a dog 72 which is bent into an L-shape and whose upper end is positioned below the limit switch 71, and these constitute the position detection means 7.

Note that a stopper body 63 is provided on the upper surface of the outer periphery of the die 6 with projections.

The circuit of the hydraulic switching unit is shown in FIG. In the figure, oil passages 81 and 82 lead to a hydraulic pump (not shown). The oil passage 81 returns via a relief valve 83 and returns to the oil passage 5 via a solenoid valve 84.
It is connected to 2. The oil passage 52 returns via a solenoid valve 85 and a relief valve 86.

The oil passage 82 returns via a relief valve 87 and communicates with the oil passage 13 via a solenoid valve 88 and a check valve 89 which are connected in parallel. Here, the set pressure of the relief valve 86 is set smaller than the set pressure of the relief valve 83.

In the opposed die shearing device having the above structure,
Initially, all of the solenoid valves 84, 85, and 88 are in a non-energized state. In this state, the working oil pressure of the oil passage 52 is the value set by the relief valve 83, and on the other hand,
The oil passage 13 is relieved through a check valve 89.

The workpiece M is placed on the die 6 with projections (first
Figure) When the slide S is lowered, the unprocessed material M is held between the die 6 with projections and the die 2. Further, when the slide S continues to descend, the workpiece M
The periphery of the center of the workpiece M is compressively deformed between the lower surface of the die 2 and the upper surface of the protrusion 61, and the counter punch 12 retreats, causing the center of the workpiece M to enter the punch hole of the die 2 and undergo shear deformation. Seshimeraruru (Figure 2).

At this time, the dog 72 comes into contact with the limit switch 71 to operate it, and the solenoid valves 84 and 85 are energized. As a result, the working oil pressure of the oil passage 52 is reduced to the pressure set by the relief valve 86.

In this state, if the slide S is further lowered,
The piston 51 can no longer support the die 6 with projections against the pressure of the die 2, and the die 6 with projections descends as the die 2 descends (FIG. 3). Along with this, the punch 4 rises relatively, punches out the center of the workpiece M, and the shearing process is completed.

After finishing, the slide S is raised and the solenoid valve 88 is energized at the rising end. Hydraulic oil is supplied to the oil passage 13, and the counter punch 12 moves forward to discharge the processed product from the die 2.

Alternatively, the die 2 may be provided on the lower mold 3, and the protruding die 6 and the punch 4 may be provided on the upper mold.

[Brief explanation of drawings]

1 to 3 are vertical sectional views of the opposed die shearing device, and FIG. 4 is a circuit diagram of the hydraulic switching unit. 1... Upper die, 2... Flat die, 3... Lower die, 4...
... Punch, 5A, 5B ... Cylinder chamber (hydraulic cylinder), 51 ... Piston, 6 ... Die with protrusion,
61... Protrusion, 7... Position detection means, 71...
Limit switch, 72...Dog, 8...Hydraulic switching unit (hydraulic switching means), 92...Sub guide post (guiding member), B...Press bolster,
M...Work material, S...Press slide.

Claims (1)

[Scope of utility model registration request] An upper mold fixed to the press slide, a lower mold fixed to the press bolster facing the press slide, a flat die provided on one of the upper mold and the lower mold, and a flat die provided on the other of the upper mold and the lower mold. a punch and a hydraulic cylinder, supported by a piston of the hydraulic cylinder and positioned opposite to the flat die;
A die with a protrusion, which has a protrusion having the same outline as the flat die on the opposing surface and is slidably fitted around the outer periphery of the punch, and a die with a protrusion, which is installed between the upper die and the lower die; a guide member for vertically guiding the die and the protruding die; a position detection means for detecting the relative position of the flat die and the protruding die; and a position detecting means for detecting the relative position of the flat die and the protruding die; an opposed die shearing device comprising a hydraulic pressure switching means for reducing hydraulic pressure;