JP2001001200A - Knock out device of press machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate under a stabilized knock out load and to reduce noise and energy by mechanically linking both ends of knock out arm fixed at the midway with a knock out flock to an actuating source. SOLUTION: A knock out block 19 is slidably arranged to a cylindrical guide rail 17 through plural intermediate liners 18. The lower end of the knock out block 19 is connected to a knock out arm 23 arranged as crossing at the center part of a bed 2. Both ends of the knock out arm 23 are engaged turnably to respective one end of piston rods 25, 251 of double action type hydraulic cylinders 24, 241 through clevises 26, 261. The double actin type hydraulic cylinders 24, 241 are operated while subjecting to pressure control by a variable volume type hydraulic pump in synchronizing left/right. Further, a proportional pressure control valve is arranged to the discharge circuit of the hydraulic pump, an oil volume is linked to the motion of a press machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knockout device for a press machine for removing a pressed product from a mold.

[0002]

2. Description of the Related Art A knockout device of a press machine is an indispensable mechanism for taking out a pressed product, and is widely used regardless of the type of press. A typical structure is shown in Japanese Patent Application Laid-Open No. 6-126368. In this embodiment, the bolster for fixing the mold is fixed to the upper surface of the bed, and a through hole is formed in the center of the bolster and the bed, and a mandrel moving pin is inserted there. The knockout pin is configured to rise by a roller abutting the lower end of the pin. The roller is configured to interlock with a cam mechanism via first to third link mechanisms. On the other hand, JP-A-9-285
No. 830 discloses a knockout device having a structure in which a knockout pin is guided by a case and a tapered block.

[0003]

However, in the former configuration, the roller rotates along the locus drawn by the tip of the link member that rotates about one end as a fulcrum. Therefore, the point of contact with the knockout pin moves according to the position of the roller, and the knockout pin also moves.As a result, it is difficult to always push the knockout pin vertically, which causes mechanical vibration and noise, or causes sliding. Inconveniences such as high energy required for operation as a load occur.

On the other hand, the roller of the latter still moves along the movement trajectory of the knockout lever similarly to the former, and does not always push up the center of the knockout pin at the time of knockout. Therefore, naturally, bending stress acts on the knockout pin, and smooth movement between the knockout pin and the case cannot be obtained.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a low-noise, energy-saving press machine with a simple structure that requires a small amount of energy for the knock-out operation, always operates with a stable knock-out load, and is low in noise and energy saving. .

An object of the present invention is to provide a knockout device for a press machine having a die cushion function with a simple configuration.

[0007]

According to the present invention, there is provided a bolster disposed opposite a mold mounting surface of a slide which moves up and down, a knockout pin disposed through the bolster, and the knockout pin is knocked out. A knockout block, a plurality of intermediate liners having at least one surface facing the block side surface as a spherical surface are disposed between a side surface of the knockout block and a pair of guide rails arranged and fixed facing the block side surface. A knockout device comprising an actuation source for raising the knockout block, wherein the knockout block is attached and fixed to an intermediate portion of a knockout arm, and both ends of the knockout arm are mechanically connected to the actuation source, respectively. The knock-out device of a press machine It is achieved.

[0010] Preferably, the present invention is achieved by a knockout device for a press machine, wherein a hollow portion is provided in an intermediate portion of the arm, and a lower end portion of a knockout block is inserted and connected to the hollow portion.

[0009] Preferably, the present invention is achieved by a knockout device for a press machine, wherein the guide rail is a triangular grooved rail, and has two surfaces in contact with the other surface of the intermediate liner.

In a preferred embodiment of the present invention, the guide rail has a cylindrical shape and has a triangular groove extending radially from the center thereof, and the other surface of the intermediate liner is brought into contact with the groove at two surfaces. Is achieved by the knockout device.

[0011] Preferably, the present invention is achieved by a knockout device for a press machine, wherein the triangular groove is a 120-degree wide-angle groove.

According to the present invention, there is provided a bolster disposed opposite to a mold mounting surface of a vertically moving slide, a knockout pin penetrating through the bolster, a knockout block for knocking out the knockout pin, and a knockout block. A knockout device comprising a reciprocating double-rod cylinder for raising a block, a hydraulic pump and a hydraulic pressure generating device which forms a closed circuit and drives and controls the cylinder, wherein the hydraulic pressure generating device includes at least a flywheel and a clutch. And a proportional pressure control valve provided in a discharge circuit of the hydraulic pump and configured to adjust the degree of restriction of a passage according to a press load. Achieved by the featured press machine knockout device.

Preferably, in the present invention, the proportional pressure control valve comprises:
Recognizes when the slide press work point is reached as the operating point,
This is achieved by a knockout device for a press machine characterized by lowering the knockout block by its own weight.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to a screw-type mechanical press shown in FIGS. 1 to 4, a press machine 1 has a screw shaft in which a pump motor 4 is arranged and fixed on a crown portion 3 at an upper portion of a frame 2 and an external thread is formed on an output shaft 5 of the press shaft 1 via a coupling member composed of a flange 6. 7 is fixedly connected. The screw shaft 7 extends substantially to the center of the press machine body, and is screwed with a spherical nut 8 having a hemispherical lower end, and the nut is connected and fixed to the upper slide 9 via a key or the like.

The lower slide 10 has a play hole 11 at the center for receiving the screw shaft 7 and an upper surface at the seat 12.
And is in spherical contact with the spherical nut 8 through the contact hole. And it is suspended and fixed to the upper slide 9 by bolts.

The slide guide device is fixed to the inside of the frame 2 and has four fixed gibs 13 serving as rails.
And intermediate liners 14, 15 located between the slide 9 (10) and the fixed gib 13.

Next, the knockout device 16 which is the gist of the present invention will be described in detail with reference to FIGS. 2 to 5. A cylindrical guide having a pair of triangular grooves 17a planted at substantially the center of a press machine. A knockout block 19 is slidably disposed on the rail 17 via a plurality of intermediate liners 18 made of a bearing material or the like. The knockout block 19 is arranged to face a knockout pin 22 of a bolster 21 mounted on a bed 20. The thickness of the knockout block 19 is substantially equal to the diameter of the guide rail 17, and has a semicircular groove 19a for positioning the intermediate liner 18 on both sides.

Here, the intermediate liner 18 has a hemispherical surface 18a at its outer periphery, as shown in FIGS. 4 and 5, and is brought into surface contact with the semicircular groove 19a of the knockout block 19, thereby forming a triangular projection 18b on the opposite surface. The guide rail 17 is in contact with the triangular groove 17a. The intermediate liner 18 has a projection 18c at the top of the outer periphery and has a knockout block 1
The configuration is such that the lens does not fall down while maintaining a fixed positional relationship with the lens 9.

The lower end of the knockout block 19 is connected to a knockout arm 23 which is arranged across the center of the bed 20. The knockout arm 23 has a hollow portion 23a penetrating the intermediate portion. The lower end of the knockout block 19 is inserted into the hollow portion 23a, and is integrally fixed by a bolt 231 or the like while maintaining a right angle positional relationship. Here, the knockout arm 23 is formed integrally by stacking a plurality of plate members, and there is no functional difference even if the hollow portion 23a is formed.

Next, the knockout arm 23 is provided with a double rod hydraulic cylinder 24 having two ends serving as operating sources.
241 are rotatably engaged with one ends of piston rods 25, 251 via clevises 26, 261, respectively. The reciprocating double rod hydraulic cylinders 24, 241
As shown in FIG. 1, the oil supplied from the tank 27 is hydraulically controlled by a manually operated variable displacement hydraulic pump 28, and the left and right are operated synchronously. The hydraulic pump 28 is driven by the energy stored in the electric motor M via the flywheel 29, and its transmission is performed via a clutch mechanism 31 controlled by a driving source 30 such as air. Therefore, there is an advantage that the hydraulic pressure generating energy can be stably supplied to the hydraulic pump 28 with an extremely small power source.
Further, a pressure control valve 32 for guiding oil to the tank 27 when the oil pressure exceeds a set value is provided in the hydraulic circuit to protect the hydraulic circuit.

Further, a characteristic of the hydraulic pressure generating device including the present hydraulic circuit is that a proportional pressure control valve 33 is provided in the discharge circuit of the hydraulic pump 28, and the amount of oil flowing through the control valve is interlocked with the movement of the press machine 1 so as to be electromagnetic. That is, it is configured so as to be able to be controlled. Since the purpose is to function as a die cushion, the control valve is configured to be narrowed according to the press load.

In such a configuration, the pump motor 4
When the screw shaft 7 rotates in the anti-propulsion direction, the spherical nut 8 screwed to the screw shaft 7 moves down along with the upper slide 9 which is rotationally restrained by the guide rail 13 and the intermediate liner 14 by screw action. I do. Of course, the lower slide 10 connected to the upper slide 9 also descends integrally. Here, since the lower slide 10 and the upper slide 9 with the mold are separated from each other, the screw rotating force generated in the upper slide 9 causes the lower slide 10 to rotate.
It is possible to minimize the torsional force during product processing without being directly transmitted.

Next, regarding the knockout device as the gist, the oil supplied from the tank 27 to the hydraulic circuit is clutched by the hydraulic pump 28 driven by the rotational force of the flywheel 29 storing the rotational energy of the electric motor M. When the mechanism 31 is put in, the left and right cylinders 24, 24
It is pumped to 1. Then, the piston lots 25, 251 of both cylinders 24, 241 are simultaneously sucked upward, whereby the knockout arm 23 integrated with the knockout block 19 also rises while maintaining the parallelism, and provides a knockout effect. On the other hand, after the completion of the knockout operation, the clutch opening / closing drive source 30 releases the clutch mechanism 31 to form an oil return circuit, thereby returning the knockout block 19 and the knockout arm 23 to their original positions under their own weight. FIG. 8A shows a motion diagram of the slide 9 (10) and the knockout block 19 at the time of bed knockout specification at this time.

The knockout device 16 can be used as a die cushion device by adding a proportional pressure control valve 33 to a hydraulic circuit. That is, slide 9
At the same time as (10) starts to descend from the top dead center, the knockout arm 23 integrated with the knockout block 19 is raised as described above. Thereafter, when the proportional pressure control valve 33 is closed at the top dead center of the knockout block 19, the knockout block 19 can be held at the top dead center.
Then, at the same time when the slide starts the press work, the knockout block 1
9 is pushed down. At this time, by adjusting the proportional pressure control valve 33 in accordance with the press load, the descending speed of the knockout block 19 can be adjusted, and therefore, an optimum cushioning ability can be exhibited. As described above, the die cushion function can be freely adjusted according to the press operation, the impact at the time of pressing is small, and a low-noise and energy-saving press apparatus is obtained. FIG. 8B shows a motion diagram of the slide 9 (10) and the knockout block 19 at the time of die cushion specification at this time.

Further, the knockout motion and the die cushion motion can be combined and used as a so-called locking device. That is, from the start of the press work to the bottom dead center of the slide 9 (10), FIG.
It functions as a die cushion by the motion shown in
After the end of the press work, the process shifts to the motion shown in FIG. 8A and functions as a knockout. Thus, by freely adjusting the hydraulic return circuit of the hydraulic pressure generating device, the knockout device can function as a knockout motion, a die cushion motion, and a locking device that combines them.

Further, the knockout device 16 is extremely less affected by an eccentric load, and even if an eccentric load is generated in the knockout block 19, a plurality of knockout devices (for example, two on each side) are provided between the guide rail 17 and the knockout block 19. Are arranged, the respective intermediate liners 18 absorb the eccentric load (self-alignment), and the smooth vertical movement of the knockout block 19 is maintained. As shown in FIGS. 4 and 5, the intermediate liner 18 comes into surface contact with the triangular groove 17a of the guide rail 17, and rises along the groove. On the other hand, since the hemispherical surface is configured to be freely rotatable at the prescribed position of the semicircular groove 19a, the hemispherical surface can be easily positioned between the guide rail 17 and the knockout block 19 by a combination of the spherical surface and the flat surface. The knockout can be stably performed with a small energy source, and the effect of resource saving is great. Sliding between these components is made more effective by the supply of lubricating oil. Further, the triangular groove is a 120-degree wide-angle groove in order to suppress separation and to secure a wide contact surface to stabilize mechanical strength, which can greatly contribute to assembling workability.

FIGS. 6 and 7 show another embodiment, which is essentially the same as the previous embodiment, except that the guide rail is a triangular prism 171.
The inner surface of the intermediate liner 181 is processed into a triangular shape, and the triangular prism 171 is slid in two-side contact, and the outer peripheral surface processed into a spherical surface is rotated into a spherical recess formed on the side surface of the knockout block 19 as in the above-described embodiment. Surface contact freely. Although details are omitted, it is natural that all sliding surfaces are lubricated as necessary, and appropriate materials are selected in combination.
According to still another embodiment shown in FIG. 7, the guide rail 172 is made of a cylindrical material,
2 is slid, and is essentially the same as the previous embodiment.

[0028]

According to the present invention, a knockout device for a press machine which requires a small amount of energy for knockout, always operates with a stable knockout load, has low noise and is energy saving, and a knockout device having a die cushion are provided. It can be provided with a simple configuration.

According to the present invention, an intermediate liner having at least one surface opposed to the side surface of the block between a side surface of the knockout block that rises and a pair of guide rails arranged and fixed opposite to the side surface of the block. A plurality of knockout blocks are connected, and the knockout block is connected to an intermediate portion of an arm having both ends mechanically connected to an operation source, whereby the knockout block can always be moved horizontally, and a knockout device with a small movable load. Can be realized. In addition, the spherical intermediate liners arranged on both sides are self-aligning even if a slight eccentric load occurs, so that the block moves smoothly and is extremely quiet and light. Is provided.

The hollow portion is provided at the middle of the arm, and the lower end of the knockout block is inserted and connected to the hollow portion to provide a knockout device with good weight balance and low mechanical vibration in a simplified structure. Is done.

The guide rail is a rail with a triangular groove. By contacting the other surface of the intermediate liner with two surfaces, the intermediate liner slides stably even when an eccentric load is generated, and a knockout device of energy saving type with less movable energy is provided. Provided.

The guide rail is cylindrical and has a triangular groove extending radially from the center portion. The groove has a two-side contact structure on the other surface of the intermediate liner, so that the guide rail is small, lightweight, and has high rigidity and stability. And a knockout device having a slide mechanism that operates in the same manner.

By forming the triangular groove as a 120-degree wide-angle groove, the angle becomes geometrically stable, and a more stable and highly rigid slide mechanism is provided with a small size and light weight.

According to the present invention, the hydraulic pressure generating device for controlling the driving of the cylinder is provided in a hydraulic pump that generates a hydraulic pressure by being rotationally driven by at least a flywheel and a motor through a clutch, and a discharge circuit of the hydraulic pump. By providing a proportional pressure control valve that adjusts the degree of throttle of the passage according to the press load, it is possible to function as a die cushion by freely adjusting the hydraulic return circuit, And a low-noise, low-energy type knock machine for a press machine.

A knockout device is provided for the proportional pressure control valve, which recognizes an operation point when the slide press operation point is reached, and can reliably maintain the die cushion function.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a main part of a screw press machine according to an embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional side view of a main part of the knockout device of FIG. 1;

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is an enlarged perspective view of a main part of a slide guide in FIGS. 1 and 2;

FIG. 5 is a cross-sectional view of the intermediate liner shown in FIG. 4;

FIG. 6 is a cross-sectional view of the intermediate liner portion of FIG. 2 in another embodiment.

FIG. 7 is an enlarged perspective view of a main part of a slide guide section in FIG. 4 in still another embodiment.

FIG. 8 is an operation characteristic diagram of the knockout device with respect to a slide stroke in the embodiment of the present invention.

[Explanation of symbols]

1 is a press machine, 2 is a frame, 3 is a crown, 4 is a pump motor, 5 is an output shaft, 6 is a flange, 7 is a screw shaft, 8 is a spherical nut, 9 is an upper slide, 10 is a lower slide, 11 is A play hole, 12 is a seat, 13 is a guide rail, 14 is an intermediate liner, 15 is an intermediate liner, 16
Is a knockout device, 17 is a guide rail, 18 is an intermediate liner, 19 is a knockout block, 20 is a bed, 21 is a bolster, 22 is a knockout pin, 23 is a knockout arm, 24 and 241 are reciprocating double rod hydraulic cylinders, 25 , 251 is a piston rod (operating source), 26 and 261 are clevis, 27 is a tank, 28 is a hydraulic pump, 29 is a flywheel, 30 is a driving source,
1 is a clutch, 32 is a pressure control valve, 33 is a proportional pressure control valve

Claims (7)

[Claims] 1. A bolster disposed opposite a die mounting surface of a slide that moves up and down, a knockout pin disposed through the bolster, a knockout block that knocks out the knockout pin, and a knockout block that knocks out the knockout pin. An operation of arranging a plurality of intermediate liners having at least one surface facing the block side surface as a spherical surface between a side surface and a pair of guide rails arranged and fixed facing the block side surface, and raising the knockout block; A knockout device comprising a knockout arm, wherein the knockout block is attached and fixed to an intermediate portion of a knockout arm, and both ends of the knockout arm are each mechanically connected to the operating source. Knockout device. 2. The knockout device for a press machine according to claim 1, wherein the arm has a hollow portion at an intermediate portion, and the lower end portion of the knockout block is inserted and connected to the hollow portion. 3. The knock-out device for a press machine according to claim 1, wherein the guide rail is a rail with a triangular groove, and has two surfaces in contact with the other surface of the intermediate liner. 4. The guide rail according to claim 1, wherein said guide rail has a cylindrical shape and has a triangular groove extending radially from a central portion thereof, and the other surface of said intermediate liner is brought into contact with said groove at two surfaces.
A knockout device for a press machine according to any one of the above. 5. The knockout device for a press according to claim 4, wherein the triangular groove is a 120-degree wide angle groove. 6. A bolster disposed opposite to a mold mounting surface of a vertically moving slide, a knockout pin penetrating through the bolster, a knockout block for knocking out the knockout pin, and a knockout block. A reciprocating double rod cylinder to raise,
A knockout device comprising a hydraulic pump and a hydraulic pressure generating device that constitutes a closed circuit and drives and controls the cylinder,
The hydraulic pressure generating device is provided at a hydraulic pump that generates a hydraulic pressure by being rotationally driven by an electric motor via at least a flywheel and a clutch, and is provided in a discharge circuit of the hydraulic pump, and a degree of throttling of a passage is adjusted according to a press load. And a proportional pressure control valve. 7. A knockout device for a press machine, wherein the proportional pressure control valve recognizes an operation point when the slide press operation point is reached, and lowers the knockout block by its own weight.