JPS6041360Y2 - Bottom dead center adjustment device for press machines, etc. - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bottom dead center adjusting device for a press machine or the like.

Conventionally, the bottom dead center adjustment device in presses and other machines is built into the hydraulic cylinder that operates the slide frame, which makes maintenance and replacement difficult, and the position is affected by thermal expansion caused by changes in oil temperature. There was a drawback that errors occurred.

The present invention eliminates the above drawbacks, and by locating the device outside the cylinder, maintenance and parts replacement are easy, it is not affected by oil temperature, the positioning accuracy is good, and the bottom dead center can be adjusted. To provide a bottom dead center adjusting device that is easy and accurate and does not cause eccentric impact due to tilting of a slide plate at bottom dead center.

An embodiment of the present invention will be described.

In FIGS. 1 and 2, a front plate 2A and a rear raft 2B are fixed to each other with a predetermined gap between opposing frames 1, 1.

Both plates 2A. Slide plate 3 approximately in the center of 2B
are arranged, and the slide plate is connected to the front and rear plates 2 by guide protrusions 4 formed on both sides of the slide plate.
It slides in contact with surfaces a and 2b and is freely movable up and down.

A table 5 is fixed below the slide plate 3 at a predetermined distance, and a lower die 7 is held on this table via a pedestal 6.

An upper mold 8 is fixed to the lower end of the slide plate 3 so as to face the lower mold 7.

A vertically elongated hole 9 is formed in the slide plate 3, and a hydraulic cylinder 10 is located within this hole.

The hydraulic cylinder has a front plate 2a and a rear plate 2.
It is firmly fixed by a fixing member 11 protruding from b.

The hydraulic cylinder 10 is driven by oil supplied from a hydraulic mechanism 13 through pipes 12 passing through the cylinders 1 to 2b.

The lower end of the ram 14 of the cylinder is connected to a connecting part 15 provided at the lower side of the hole 9 of the slide plate 3.

A reinforcing plate 16 is attached to the lower side of the hole 9 to receive the impact at the bottom dead center.

A bottom dead center device 11 is disposed at the top of the cylinder 10.

The bottom dead center device 17 will be explained with reference to the third to fifth illustrations.

Boss 18 with female thread 18a formed on the top surface of cylinder 10
is fixed.

A lower casing 19a is fixed to the upper end of the boss 18, and an upper casing 19b is fixed to this with screws 20.

An adjustment screw-2-1 having a male thread 21a formed on its outer periphery that is screwed together with a female thread 18a passes through the post 18 and the casings 19a, 19b, and has a flange portion 21b formed at its protruding upper end.

Furthermore, the male thread 21a has grooves 2 in the axial direction in at least two places.
1c and 21c are perforations.

A connecting piece 22.22 engages in this groove.

A bevel gear 23 is disposed within the casing.

This bevel gear has a center hole 23a through which at least the adjusting screw 21 can pass, and is fixed to the connecting piece 22 by a screw 24.

A hall bearing 25 is interposed between the upper surface of the post 18 and the lower surface of the bevel gear 23.

The upper end of the adjustment screw 21 has a concave portion 26 on one side of the spherical contact surface.

The other convex portion 27a of the spherical contact surface that is in contact with this concave portion
The impact receiver 27 has a recess 2 provided at the center of its upper surface.
It is fixed to the center of the adjusting screw 21 by a fixing port 29 via a countersunk spring 28 in 7b, and is slidable by a spherical contact surface.

As shown in FIG. 5, the bevel gear 23 has a pinion gear 30.
are meshing.

The pinion gear is fixed to a rotating shaft 31, and the rotating shaft has a ball bearing 33 attached to a casing 32 of the pinion gear.
It is rotatably supported by a frame 1 at both ends thereof.

One end of the rotating shaft passes through the frame and is connected to a bottom dead center adjustment motor 34 disposed on the outer surface of the frame.
It is rotationally driven by this motor.

Lubricating oil is supplied into the casings 19a, 19b and the casing 32, and this oil is supplied to the male thread 2 through the groove 21c.
It is also supplied between the female threads 1a1 and 18a.

In the second illustration, the workpiece P is the front plate 2A.
It is supplied onto the lower die 7 from the side, and a vertical and depth position adjustment device 35 is provided behind the table 5, and a stopper 36 for the workpiece material is adjusted by this adjustment device 3.
5.

Next, the adjustment of the bottom dead center will be explained.

In this example, when the motor 34 is rotated one turn clockwise, the rotating shaft 31
The pinion 30 rotates once through the pinion 30, the bevel gear 23 rotates in conjunction with this, and the adjusting screw 21 also rotates in conjunction with the connecting piece 22.22.

For this purpose, the male screw 21a descends while rotating on the female screw 18a, and the adjusting screw 21 moves downward by 0.477E+71 by sliding the connecting piece 22 within the recess 121c.

Conversely, when the motor 34 is rotated one turn to the left, the adjusting screw 21 moves upward by 0.4771771.

As the adjustment screw 21 moves up and down, the impact receiver 27 also moves to 0.
Move up and down by 4mm.

In the drive circuit of the motor 34, a counter 37 attached to the frame 1 is connected in series by a lead wire 37a, and the drive current is supplied to the motor via the counter when a motor drive push button is pressed. It is.

The scale of this counter 37 corresponds to the bottom dead center position of the upper mold 8.

To explain this in more detail, when the cylinder ram 14 is lowered by the operation of the hydraulic mechanism 13 and the slide plate 3 is lowered, the lower side of the reinforcing plate 16 comes into contact with the upper surface of the impact tray 27 and is prevented from lowering. This determines the bottom dead center of the upper die 8.

For this reason, when the position of the impact receiver 27 changes as the motor 34 rotates, the change directly results in a change in the bottom dead center position of the upper die 8.

Therefore, the counter 3 installed in series with the motor drive circuit
By making the scale of 7 correspond to the bottom dead center position,
The bottom dead center position can be easily adjusted according to the scale of the counter.

Here, an example of bottom dead center adjustment will be explained with reference to FIG.

In the present example in which the workpiece P is processed into a desired bending angle α by the bending method, the lower mold 7 has a groove 7a of, for example, 89 degrees.

Then, the bottom dead center position A in which the lower end of the upper mold 8 has descended until it pinches the material and comes into contact with the corner of the groove 7a is set as, for example, "ioo" on the scale of the counter 37.

Conversely, the bottom dead center position B, in which the lower end of the upper mold has descended to a position where it only touches the surface of the material but does not press it, is set at, for example, "O"' on the scale of the counter 37.

The counter is marked with a uniform scale from 0 to 100.

Then, as described above, it is first confirmed using a sample or the like that the bottom dead center position C required to process the workpiece P to the desired bending angle α is the position corresponding to, for example, the scale "50'" on the counter 37.

Then, the push button of the motor drive circuit is pressed to drive the motor 34, and when the scale of the counter 37, which operates with the rotation of the motor, reaches "50", the push button is released.

As a result, the bottom dead center position of the upper die 8 is set to C.

After the bottom dead center position is adjusted to C in this way, the oil pressure is 8
Activate the mechanism 13.

When the slide plate 3 descends and collides with the impact receiving tray 27 and is prevented from descending, the bottom dead center position of the upper mold 8 at this time is C, and the desired bending process is performed.

Furthermore, the impact during this downward movement is applied to the impact receiver 27 and the adjusting screw 2.
The surface in contact with 1 is a spherical surface, and both are disc springs 28.
Even if there is a slight inclination in the slide plate 3, the impact receiver can slide on its spherical surface to accommodate this, so the entire surface receives the impact force evenly. The eccentric ig force is not transmitted to the cylinder, etc., and there is no damage.

As mentioned above, according to the present invention, the mechanism for adjusting the bottom dead center is located outside the cylinder, so maintenance and parts replacement are easy, and when the cylinder is hydraulically operated, the oil temperature It is unaffected and always operates with high precision.

In addition, since a shock receiving plate having a spherical contact surface is used, there is no eccentric impact caused by the inclination of the slide plate in the lowered position of the slide plate, and no damage is caused to the cylinder or the like.

Furthermore, since the bottom dead center adjustment motor is driven via a counter equipped with a scale corresponding to the bottom dead center position, the bottom dead center can be easily adjusted and the position can be adjusted accurately, resulting in many excellent effects. There is.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially cutaway front view, Fig. 2 is a longitudinal sectional view, Fig. 3 is an enlarged longitudinal sectional view of the main part, and Fig. 4 is a partially cutaway front view. FIG. 5 is an enlarged sectional view taken along the line V--V in FIG. 3, and FIG. 6 is an enlarged explanatory view for explaining adjustment of the bottom dead center. 3... Slide plate, 7... Lower die, 8... Upper die, 9... Hole, 10...
...Cylinder, 21...Adjustment screw, 26,
27a... Spherical opposing surface, 27...
Impact receiver, 34...Bottom dead center adjustment motor, 37
······counter.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A lower mold, a slide plate that holds an upper mold that faces the lower mold, has a vertically elongated hole, and is movable up and down; A cylinder is provided at the top of the cylinder to drive the slide plate vertically, and a spherical contact surface is provided at the upper end of the cylinder. It has an adjustment screw that can move up and down in conjunction with rotation, and a spherical contact surface on the lower part that is in contact with the contact surface of the adjustment screw. The upper part is slidably connected to the surface, and the upper part can come into contact with the lower side of the hole, and the impact receiver receives the impact caused by contact with the lower side when the slide plate is lowered, and the plate is connected to the shock receiver. A bottom dead center adjustment device for a press machine, etc., characterized by comprising: 2 Claims for Utility Model Registration Paragraph 1 provides for a bottom dead center adjusting device such as a press machine, wherein the bottom dead center adjusting motor is driven by a counter provided with a scale corresponding to the bottom dead center position. .