JPH0757440B2 - Die height adjusting device for press machine - Google Patents

Description

The present invention relates to a die height adjusting device for a press machine.
More specifically, the present invention relates to a device that adjusts a die height by rotating an adjustment screw shaft to change a slide position with respect to a connecting rod.

[Prior Art] A connecting rod and a slide of a press machine are connected via a suspension point structure. The suspension point structure is roughly classified into a ball type and a wrist pin type, but it is well known that the ball type is widely adopted because of its advantages such as small size, low cost, and little backlash.

Such a ball type suspension point structure is shown in FIG.

In FIG. 2, an adjusting screw shaft 2 is attached to the connecting rod 1 by screwing screws 1a and 2a, and a ball 3 is fixed to the lower end portion of the adjusting screw shaft 2.

On the other hand, a ball cup 5 is incorporated in a slide 7 which is slidably guided by a column or the like so as to be vertically movable. Reference numeral 7a is a cylindrical body that is integral with the slide 7 and accommodates the worm wheel 8, 7b is a slide component that transmits the vertical movement of the ball 3 to the slide 7, and 6 is an overload safety device. It is a hydraulic chamber.

Here, since the connecting rod 1 and the slide 7 are connected via a spherical bearing structure formed by the ball 3 and the ball cup 5, that is, a point structure, the slide 7 is moved up and down by the swinging motion of the connecting rod 1. It can be moved linearly.

By the way, in the press machine, the distance between the bolster and the slide 7, that is, the die height needs to be accurately adjusted according to the mold used, so that the worm wheel 8 rotated by the worm screw 9 is attached to the cylindrical body 7a of the slide 7. Put on,
On the other hand, a pin 4 extending in the radial direction is attached to the ball 3, and the pin 4 is inserted into the vertical groove 8a of the worm wheel 8 so that both pins
A die height adjusting device is provided in which 3 and 8 are connected so that they can rotate synchronously.

Therefore, if the worm screw 9 is automatically or manually rotated, the worm wheel 8 is rotated. This rotation is transmitted to the ball 3, that is, the adjusting screw shaft 2 via the pin 4. Then, since the connecting rod 1 (female screw 1a) and the adjusting screw shaft 2 (male screw 2a) rotate relative to each other, the slide 7 is moved in the vertical direction with respect to the connecting rod 1 connected to the crank shaft, and the die height is changed. Increase / decrease can be adjusted.

Then, when the crank shaft is rotated, the connecting rod 1 is oscillated around the ball 3, whereby the slide 7 can be stroked in the vertical direction to press-mold a predetermined product with the adjusted die height.

[Problems to be Solved by the Invention] However, according to the above-described conventional structure, the drive motor for the worm screw shaft 9 needs to be attached to the slide 7,
The structure must be vibration-proof and the wiring becomes complicated. Also,
Since the screw (adjustment nut) 1a of the connecting rod 1 and the adjustment screw shaft 2 (2a) are a combination of one each, they are easily loosened and there is a risk that the die height may change during the press operation. In order to avoid this, a nut 1'is provided and a locking hydraulic chamber must be formed on the side of the swinging connecting rod 1, which complicates the apparatus.

Further, when a stick occurs, the connecting rod 1 is deadlocked in a vertical state, and therefore, in order to remove the upper mold from the lower mold, it is necessary to loosen the tie rod, which causes a great deal of labor and time. Occurs.

According to the present invention, the die height can be surely held after the die height adjustment, the connecting rod and the slide can be separated when a stick occurs to enable quick processing, and the drive motor can be disposed on the crown side. To provide a die height adjusting device for a wide range of press machines.

[Means for Solving the Problem] The present invention provides a ball formed at a lower end portion of a connecting rod, a ball cup for slidingly guiding the ball,
A rotating body that carries this ball cup and has an adjusting screw shaft formed at the lower end and a rotating body that is rotatably connected to a connecting rod are placed on the crown side for rotating and driving via a worm wheel. A worm screw shaft provided, and two adjusting nuts screwed into the adjusting screw shaft and mounted in the cylinder formed on the slide side so as not to rotate and to be axially displaceable within a certain stroke. And a hydraulic pressure supply means for supplying a hydraulic pressure for locking the adjustment nut to the adjustment screw shaft such that the adjustment nut cannot rotate relative to the adjustment screw shaft and cannot be displaced in the axial direction in a hydraulic chamber formed below the adjustment nut in the cylinder.

[Operation] In the present invention, when the worm screw shaft is rotated to rotate the rotating body, the adjusting screw shaft and the adjusting nut rotate relative to each other. Then, since the adjusting nut is attached to the slide so as not to rotate, the slide can be moved up and down to adjust the die height.

If a predetermined hydraulic pressure is supplied from the hydraulic pressure supply means to the hydraulic chamber after the die height adjustment, the two adjusting nuts and the adjusting screw shaft are locked so that they cannot rotate relative to each other. Therefore, if the crankshaft is rotated, the adjusting die height can be accurately held and the press operation can be performed.

Then, when a stick in which the upper die meshes with the lower die occurs, when the hydraulic pressure is discharged from the hydraulic chamber, the adjustment nut can be displaced within a predetermined stroke. That is, the connection between the connecting rod and the slide is released. Therefore, if the crankshaft is rotated, the connecting rod can be started to swing, so that a sufficient pulling force for pulling out the upper die can be generated from the connecting rod. Therefore, the stick can be removed quickly and easily.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the present die height adjusting device includes a ball 3 formed at a lower end portion of a connecting rod 1, a ball cup 5 that forms a suspension point structure together with the ball 3, and a ball cup 5 that carries the ball cup 5. Rotating body 10 having adjustment screw shaft 2 at the lower end, and this rotating body
Worm screw shaft 9 for rotating 10 through worm wheel 8 and two adjusting nuts screwed onto adjusting screw shaft 2.
11, 12 and the adjusting nuts 11, 12 and the adjusting screw shaft 2, and a hydraulic pressure supply means 30 for supplying and discharging the hydraulic pressure for locking and unlocking the adjusting screw shaft 2. The worm screw shaft 9 and the power of the shaft 9 The source motor (not shown) is crown 10
The adjusting screw shaft 2 and the adjusting nuts 11 and 12 are locked and released by the hydraulic pressure supply means 30 so that the adjusting die height can be securely held and the stick can be removed during the press operation. It is a thing.

That is, in FIG. 1, the rotating body 10 is rotatably mounted on the connecting rod 1 by engaging the upper lid portion 10A with the ball 3, and the rotating mechanism 10 drives the worm wheel 8 and the worm screw shaft 9 at a predetermined angle. To the number of rotations.

Therefore, the rotating body 10 has a vertical groove 8a of the worm wheel 8 thereon.
A connecting pin 4 is provided to be inserted into. Therefore, when the worm screw shaft 9 is rotated by the motor (not shown) arranged on the crown 101 side, the rotating body 10 can be rotated.

Further, 11 is a lower adjusting nut, 12 is an upper adjusting nut, and both 11 and 12 have a constant clearance C1 and the adjusting screw shaft 2
It is screwed to. These adjusting nuts 11 and 12 are housed in a cylinder 20 arranged on the slide 7 side, and
By 5,16, it is not rotatable and can be displaced in the vertical direction by a constant stroke C2.

These two adjusting nuts 11 and 12 (more specifically, the upper adjusting nut 1
The upper limit position of 2 is the inner end surface 14 of the cylinder 20 and the adjustment nut 12.
It is restrained by the abutment with the upper edge 13 of the. Therefore, when the rotating body 10 is rotated, the adjusting screw shaft 2 and the two adjusting nuts 11 and 12 provided on the slide 7 side are relatively rotated, so that the slide 7 moves up and down with respect to the connecting rod 1. You can adjust the die height.

If a predetermined hydraulic pressure is applied to the hydraulic chamber 21 provided below the lower adjusting nut 11 in the cylinder 20, the lower adjusting nut
When 11 is pushed up, the upper adjustment nut 12 will
Since the upper limit position is constrained by 14, the adjusting screw shaft 2 and both adjusting nuts 1 are made by the so-called double nut method (the nut 11 and the nut 12 press and lock the adjusting screw shaft 2).
Relative rotation with 1,12 can be locked impossible. That is, it is possible to accurately hold the adjusted die height.

Therefore, when the crankshaft 100 is rotated, the connecting rod 1 swings around the ball 3, and this swinging motion is transmitted through the rotating body 10 (adjustment screw shaft 2, both adjustment nuts 11 and 12, cylinder 20). The slide 7 can be stroked.

Then, when a stick in which the upper mold engages with the lower mold is generated during the press operation, the connecting rod 1 becomes a dead lock in a vertical state in FIG. Conventionally, the tie rod is loosened while the connecting rod 1 and the slide 7 are integrated to reduce the apparent biting load, and the connecting rod 1 can be swung by the power of the crankshaft 100. The upper mold is easily pulled out by the rotation power of the.

Here, in the present invention, if the hydraulic pressure is discharged from the hydraulic chamber 21,
The slide 7 can be displaced upward with respect to both adjusting nuts 11 and 12, the adjusting screw shaft 2 and the like by a clearance C2. That is, the vertical displacement of the adjusting nuts 11 and 12 is used to separate the connection between the connecting rod 1 and the slide 7, and the adjusting nuts 11 and 12 can be moved relative to each other by a predetermined stroke (C2) without sticking the tie rod. Can leave.

Next, a hydraulic pressure supply means 30 for supplying / discharging hydraulic pressure to / from the hydraulic chamber 21.
Is connected through an oil passage 22 drilled in the cylinder 20,
The hydraulic pressure is supplied during the press operation, and is discharged when the die height is adjusted and the stick is removed.

Specifically, as shown in FIG. 1, the means 30 comprises a regulator 31, a two-way valve 32, a pressure boosting pump 33, a pressure switch 34 and a shutoff valve 35. The shutoff valve 35 is adjusted during die height adjustment and stick removal. It is formed to turn on at some time to release the hydraulic pressure.

Next, the operation will be described.

(Die height adjustment) The hydraulic pressure is released by the hydraulic pressure supply means 30.

When the worm screw shaft 9 is rotated by the motor on the crown 101 side, the rotating body 10, that is, the adjusting screw shaft 2 is rotated via the worm wheel 8 and the connecting pin 4.

Then, the adjusting nuts 11 and 12 are prevented from rotating with respect to the cylinder 20, that is, the slide 7, so that the slide 7 can be moved up and down with respect to the connecting rod 1 (that is, the bolster).

Therefore, if the worm wheel 8 is rotated by a predetermined angle, the slide 7 can be moved up and down by a predetermined height.
It can be adjusted to a predetermined die height.

(Press operation) First, when hydraulic pressure is supplied from the hydraulic pressure supply means 30 into the hydraulic chamber 21, the adjusting nut 11 is biased upward and the upper adjusting nut is pressed.
12 is biased upward through the adjusting screw shaft 2 and the upper limit position is restricted by the inner end surface 14 of the cylinder 20. Therefore, the adjustment screw shaft 2 and both adjustment nuts 11 and 12 cannot rotate relative to each other due to the frictional force of each screw portion, and the adjustment die height can be accurately held.

After that, when the crankshaft 100 is rotationally driven, the connecting rod 1 swings around the ball 3, so that the slide 7 is moved through the integral adjusting screw shaft 2, both adjusting nuts 11 and 12, and the cylinder 20. Stroke motions up and down, and press operation with adjustment die height.

(Stick release process) If a stick that the upper die engages with the lower die near the slide bottom dead center position occurs due to various reasons, at least the shaft off valve 35 is operated toward the oil discharge side to reduce the hydraulic pressure in the hydraulic chamber 21. Let it drain.

Then, the cylinder 20, that is, the slide 7 can be displaced upward within the range of the predetermined stroke (C2) with respect to both the adjusting nuts 11 and 12 and the adjusting screw shaft 2.

Therefore, if you rotate the crankshaft 100,
Since the rotating body 10 can be moved up and down, the connecting rod 1 can start swinging without load, and the deadlock state can be eliminated.

Thus, according to this embodiment, the rotating body 10 having the adjusting screw shaft 2 is rotatably connected to the ball 3 of the connecting rod 1, and is screwed with the adjusting screw shaft 2 and is non-rotatable in the cylinder 20 so as to move up and down. Since the two adjustable nuts 11 and 12 that can be displaced are provided, and the hydraulic pressure supply means 30 that biases and locks the adjustable nut 11 is provided, the adjusted die height can be held securely. Stick removal processing can be performed quickly and easily.

Further, since the motor for rotating the adjusting screw shaft 2 and the worm screw shaft 9 are provided on the crown 101 side, it is possible to eliminate vibration-proof measures for the conventional device in which the motor is arranged on the slide 7 that is stroked. Wiring is also easy.

Also, the number of adjustment nuts is two (11, 12), and the slide 7
Since it is configured such that a predetermined hydraulic pressure is applied to the hydraulic chamber 21 inside the cylinder 20 on the side, it can be automatically locked after the die height adjustment.

As described above, according to the present invention, the rotating body having the adjusting screw shaft can be rotated by the motor attached to the crown side, and the adjusting screw shaft is locked by the hydraulically actuated double nut system. Since the two adjusting nuts are screwed to the adjusting screw shaft and can be displaced vertically with respect to the slide and cannot be rotated, the adjusted die height can be held securely, and stick removal can be done quickly and easily. In addition, the structure is simple and has wide applicability, such as requiring anti-vibration measures for the motor.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional example. 1 ... connecting rod, 2 ... adjusting screw shaft, 3 ... ball, 4 ... connecting pin, 5 ... ball cup, 7 ... slide, 8 ... worm wheel, 9 ... worm screw shaft, 10 ... … Rotating body, 11 …… Lower adjusting nut, 12 …… Upper adjusting nut, 15,16 …… Rotating pin, 20 …… Cylinder, 21 …… Hydraulic chamber, 30 …… Hydraulic supply means, 100 …… Crank Shaft, 101 ... Crown.

Claims (1)

[Claims] 1. A ball formed at the lower end of a connecting rod, a ball cup for slidingly guiding the ball, a rotating body carrying the ball cup and having an adjusting screw shaft formed at the lower end, and a connecting member. A worm screw shaft provided on the crown side for rotatably driving the rotating body that is rotatably connected to the rod via the worm wheel, and the adjusting screw shaft are screwed together and formed on the slide side. Two adjustment nuts mounted inside the cylinder so that they cannot rotate and that can be displaced axially within a certain stroke, and the hydraulic pressure that locks the two adjustment nuts on the adjustment screw shaft so that they cannot rotate relative to each other and cannot displace in the axial direction. Hydraulic supply means for supplying to a hydraulic chamber formed below the adjusting nut in the
A die height adjusting device for a press machine.