JPH07106480B2 - Press machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a press machine, and more specifically, between a plunger and a slide that can move up and down in conjunction with rotation of a crankshaft. The present invention relates to a press machine in which an overload safety device is provided and connected.

(Prior Art) Conventionally, in a press machine, a plunger and a slide that can move up and down in conjunction with rotation of a crank shaft are connected by a fixing device.

Also, the overload safety device has a hydraulic chamber inside the slide,
When an overload is applied, the relief valve drains oil to prevent overload.

(Problems to be Solved by the Invention) However, the above-described fixing device for connecting the plunger and the slide of the related art and the overload safety device are individually provided, and the overload safety device itself is complicated. However, there is a possibility that oil may leak from the seal portion of the hydraulic chamber.

In view of the above circumstances, an object of the present invention was proposed in order to improve the problem. To provide.

[Structure of the Invention] (Means for Solving Problems) In view of the conventional problems as described above, the present invention moves a plunger that moves up and down in conjunction with rotation of a crankshaft in a press machine to move up and down in the press machine. A slide provided with an annular friction member for integrally fitting the plunger and slide by fitting the slide in a freely provided slide so as to be vertically movable. An annular elastic tube for pressing the friction member against the plunger to apply a tightening force is provided on the slide with a structure surrounding the friction member, and an overload acts on the slide to cause the slide and the plunger. And a sensor for detecting the relative vertical movement and releasing the pressure oil in the elastic tube. Than it is.

(Operation) In the above configuration, when an overload acts on the slide, sliding occurs against the frictional force due to the clamping of the plunger by the friction member, so that relative vertical movement occurs between the slide and the plunger. When this relative vertical movement is detected by the sensor, the pressure oil in the elastic tube is instantaneously released, the clamping force of the plunger by the friction member is weakened, and the vertical movement of the plunger relative to the slide is relatively reduced. It becomes easier and overload is prevented.

(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

Referring to FIG. 1, the frame 3 in the press machine 1
A slide 7 that moves up and down along slide guides 5A and 5B is provided on the upper part of the.

A crank shaft 9 is provided at an upper portion of the slide 7, and one end of the crank shaft 9 is interlocked with a drive device (not shown) via a gear mechanism 11.

A mounting portion 13 for mounting an upper mold (not shown) is formed on the lower surface of the slide 7.

A bed 15 is integrally attached to the lower portion of the frame 3, and a bed 19 on which a bolster 17 having a lower mold (not shown) is detachably mounted is placed on the bed 15. is there.

FIG. 2 shows the details of the connection state between the slide 7 and the connection screw 21 provided at the lower part of the crankshaft 9 so as to be vertically movable.

In FIG. 2, a connection screw 21 is connected to the other end of the connecting rod, and the other end of the connection screw 21 has a spherical surface portion 23.
Is clamped to a plunger 27 via a ball screw receiver 25.

An overload safety device 29 is provided between the slide 7 and the plunger 27, and the slide 7 and the plunger 27 are connected by the overload safety device 29. Furthermore,
When the slide 7 is overloaded, the overload safety device 29 works to prevent the overload from occurring.

More specifically, as shown in FIGS. 3 and 4, the overload safety device 29 includes an annular metal as a friction member.
31 and an annular elastic tube 35 provided on the outer peripheral portion of the annular metal 31 with a tube protecting member 33 interposed therebetween. That is, an annular metal 31 having a large friction coefficient, which is formed of, for example, an appropriate number of one or a plurality of pipes, is fitted to the plunger 27, and a tube protective member 33 is fitted to the outer peripheral portion of the annular metal 31. It is matched.

Furthermore, an annular elastic tube 35 such as a rubber tube is wound around the outer peripheral portion of the protective material 33. The outer peripheral portion of the annular elastic tube 35 is in contact with the inner wall surface of the slide 7.

A dog 37, for example, is attached to the upper right end portion of the plunger 27 in FIG.
A limit switch 39 is attached to the position corresponding to 37. When slide 7 is overloaded, the plunger
The slide 7 is detected to slide upward with respect to 27.

With the above structure, the elastic tube 35 is filled with pressure oil by a hydraulic device (not shown), so that the elastic tube 35 can move the inner wall of the slide 7, the protective material 33 and the pipe-shaped metal 31.
The slide 7 is connected to the plunger 27 by pressing the plunger 27 via. The press machine 1 is operated in this state.

When the slide 7 is overloaded while the press machine 1 is operating, slippage occurs between the pipe-shaped metal 31 and the plunger 27, and the plunger 27
On the other hand, the slide 7 slides upward, for example. When the slide 7 slides upward with respect to the plunger 27, the slide of the slide 7 is detected by the dog 37 and the limit switch 39, and the pressure oil in the elastic tube 35 is instantly released to prevent an overload. Preventing and ensuring safety.

Further, when adjusting the height of the slide 7, when the ball screw receiver 25 is unclamped from the slide 7 by the overload safety device 29 and the slide 7 is raised with respect to the plunger 27, the slide 7 in FIG. The pressure oil is sent to the upper pressure oil chamber through the pressure oil passage formed diagonally to the upper left, and the slide 7 is raised relative to the plunger 27, and then the two are integrally connected by the overload safety device 29. When relatively lowering the slide 7 with respect to the plunger 27, it is adjusted by allowing the pressure oil to escape.

In FIG. 2, a compressed air passage is provided in the lower left part of the slide 7, and air is supplied to the compressed air passage to float the plunger 27. Plunger 27 with springs instead of air
May float.

Another alternative to FIG. 2 is shown in FIG. Fifth
In the drawing, the same parts as those explained in FIG. 2 are designated by the same reference numerals, and FIG. 5 shows a press machine of almost the same type as that of FIG.

In FIG. 5, what is different from FIG. 2 is how to adjust the height of the slide 7 and how to lift the plunger 27. That is, in order to adjust the height of the slide 7, a gear 45 is attached via the output shaft 43 of the motor 41, another gear 47 is meshed with the gear 45, and the gear 47 is located below the connection screw 21. It is supported on the spherical portion 23.

Then, by driving the motor 41, the output shaft 43,
The gear 47 rotates via the gear 45. By rotating the gear 47, the height of the spherical portion 23, which is the lower portion of the connection screw 21, is adjusted.

Also, in FIG. 5, instead of the air in FIG.
A spring 49 is provided between the slide 7 and a hole formed in the lower center of the plunger 27 to float the plunger 27 with respect to the slide 7.

The other structure is almost the same as that of FIG. 2, and the overload safety device 29 is also almost the same as that of FIGS. 3 and 4, as shown in FIGS. 6 and 7. Therefore, the description of the structure and operation is omitted.

Thus, as shown in FIGS. 2 to 7, an overload safety device is provided.
The 29 is simpler in structure and less expensive than conventional individual overload safety devices.

FIG. 8 shows another embodiment which is an alternative to FIG.
In Fig. 8, the same parts as those explained in Fig. 2 are designated by the same reference numerals. FIG. 8 shows a press machine of almost the same type as in FIG. 2, but the difference from FIG. 2 lies in the height adjustment of the slide 7.

For adjusting the height of the slide 7, a worm gear (not shown) is engaged with a worm gear 51 fitted to the outer peripheral portion of the upper portion of the plunger 27, and the height of the slide 7 is adjusted via the plunger 27.

The connection between the plunger 27 and the slide 7 is effected by an overload safety device 29, as shown in FIGS. 9 and 10. That is, the specific structure of the overload safety device 29 is the ninth
Although shown in FIGS. 10 and 11, the description of FIGS. 9 and 10 is substantially the same as that described with reference to FIGS. 3 and 4, and the description thereof will be omitted. The point is that the overload safety device 29 connects the plunger 27 and the slide 7, and works when the slide 7 is overloaded to release the hydraulic pressure in the elastic tube 35 for safety.

The adjustment of the plunger 27 and the mounting portion 13, that is, the die height adjustment may be performed with a small screw diameter.

FIGS. 11 and 14 show another example in which the overload safety device 29 is used as a fixing device.

In FIG. 11, the crankshaft 9 has a connecting rod.
One end of 53 is attached, and the other end of the connecting rod 53 is connected to the connection screw 21 via a connection nut 55 by an overload safety device 29.

More specifically, as shown in FIGS. 12 and 13, in the lower part of the connecting rod 53, a connection nut 55 containing a split 55A is screwed into the threaded portion of the connection screw 21. . Moreover, a pipe-shaped metal 31 having a high coefficient of friction is fitted to the outer peripheral portion of the connection nut 55, and the pipe-shaped metal 31 and the connection rod are connected.
A pressure oil chamber 57 is formed between the inner wall of 53 and the inner wall of 53.

With the above configuration, when hydraulic pressure is sealed in the pressure oil chamber 57, the pressure causes elastic deformation of the metal 31 of the pipe, and the metal 31
Connection nut 55 with elastic deformation force of 55A
Add to the outer periphery of. Thus, the connection nut 55 is tightened to the connection screw 21, and the connection screw 21 and the connection nut 55 are loosely attached and connected.

Instead of the pipe-shaped metal 31 or the hydraulic chamber 57, an elastic tube 33 may be provided and pressure oil may be sealed in the elastic tube 33.

The height of the slide 7 is adjusted by the worm and the worm gear 51 shown in FIG.

Further, an overload safety device for preventing the slide 7 from being overloaded is provided below the slide 7. A pressure oil passage 61 communicating with a hydraulic chamber 59 formed between the slide 7 and the lower surface of the plunger 27 is formed in the slide 7 on the right side in FIG. 11, and the safety device 63 is provided in the pressure oil passage 61.
Are connected.

Thus, when the slide 7 is overloaded, the safety device 63 operates to pressurize the pressure oil supplied to the hydraulic chamber 59 formed between the slide 7 and the lower surface of the plunger 27. The oil passage 61 is prevented from being overloaded to prevent an overload and ensure safety.

FIG. 14 shows another embodiment alternative to FIG. 11,
The structure and operation of FIG. 14 are almost the same as those described with reference to FIG. 11, and the same parts are designated by the same reference numerals.

14 is different from FIG. 11 in that the overload safety device 29
Is provided between the lower end portion of the connecting rod 53 and the straight portion of the connection screw 21. More specifically, a pipe-shaped metal 31 having a large friction coefficient is fitted on the outer peripheral portion of the straight portion of the connection screw 21, and a pressure oil chamber 57 is formed on the outer peripheral portion of the metal 31.

With the above configuration, when hydraulic pressure is enclosed in the pressure oil chamber 57, the pressure causes elastic deformation of the pipe-shaped metal 31, and the metal
The elastic deformation of 31 will tighten the straight part of the connection screw 21, and the connecting rod 53 will be clamped to the straight part of the connection screw 21.
A male screw is engraved on the outer peripheral portion of the upper part of the connection screw 21, and a female screw is engraved on the inner wall of the connecting rod 53 corresponding to the male screw, and the male screw and the female screw are screwed together. .

Therefore, the connecting rod 53
Since the overload safety device 29 is clamped to the straight portion of 21, the rattling between the female screw of the connecting rod 53 and the male screw of the connection screw 21 is almost eliminated. As a result, there is almost no rattling between the internal thread of the connecting rod 53 and the internal thread of the connection screw 21, and the processing accuracy is improved.

The present invention is not limited to the above-mentioned embodiment,
It can be implemented in other modes by making appropriate changes.

[Effects of the Invention] As will be understood from the above description of the embodiments, the present invention basically provides a press machine with a plunger (27) that moves up and down in conjunction with the rotation of the crankshaft (9) in the press machine. A slide (7) that is vertically movable is provided so as to be fitted so as to be able to move up and down relatively, and the plunger (27) and the slide (7) are tightened from the surroundings.
An annular friction member (31) for integrally connecting and is provided on the slide (7), and an annular elasticity for pressing the friction member (31) against the plunger (27) to apply a tightening force. The tube (35) is provided on the slide (7) with a structure surrounding the friction member (31), and the slide (7) is overloaded and the slide (7) and the plunger (27) are connected to each other. When a relative vertical movement occurs between the two, a sensor (39) for detecting the relative vertical movement and letting out the pressure oil in the elastic tube (35) is provided.

As is clear from the above configuration, in the present invention, the plunger 27 is fitted so as to be vertically movable relative to the slide 7 in the press machine, and the slide 27 is tightened by sliding the plunger 27. 7 is provided with an annular friction member 31 for integrally connecting the plunger 27 and an annular elastic tube 35 for applying a tightening force to the friction member 31, and the slide 7 is provided. Overload acts on the slide 7 and the plunger
A sensor 39 is provided for detecting the vertical movement of the elastic tube 35 when the relative vertical movement is generated between the sensor 27 and 27, and allowing the pressure oil in the elastic tube 35 to escape.

Therefore, according to the present invention, the friction member 31 is adjusted by adjusting the pressure of the pressure oil in the elastic tube 35.
The tightening force for tightening 27 is different, and it is easy to cope with the magnitude of overload according to the type of mold, for example.

Further, since the plunger 27 is integrally connected by being tightened by the friction member 31 provided with the slide 7, the tightening by the friction member 31 is held in a loosened state, and the plunger 27 is held against the slide 7. It is possible to adjust the vertical position, and it is possible to easily adjust the maximum lift position of the slide with respect to the bolster.

[Brief description of drawings]

FIG. 1 is a schematic front view of a press machine according to an embodiment of the present invention. 2 is an enlarged cross-sectional view of a portion provided with an overload safety device, FIG. 3 is an enlarged view of a portion indicated by an arrow II in FIG. 2, and FIG. 4 is a sectional view taken along the line III-III in FIG. Is. FIG. 5 is an enlarged cross-sectional view of another embodiment replacing FIG. 2, FIG. 6 is an enlarged view of a portion taken along the arrow VI in FIG. 5, and FIG. 7 is a view taken along the line VII-VII in FIG. FIG. FIG. 8 is an enlarged cross-sectional view of another embodiment replacing FIG. 2, FIG. 9 is an enlarged view of a portion taken along the line IX in FIG. 8, and FIG. 10 is a cross-section taken along line XX in FIG. It is a figure. 11 and 14 are enlarged cross-sectional views of another embodiment which replaces FIG. 2, FIG. 12 is an enlarged view of a portion taken along the arrow XII in FIG. 11, and FIG. 13 is an X portion in FIG. It is a sectional view taken along the line III-X III. [Explanation of the symbols indicating the main parts of the drawing] 1 …… press machine, 7 …… slide 9 …… crank shaft, 21 …… connection screw 27 …… plunger 29 …… overload safety device 31 …… metal, 33 ...... Protective material 35 …… Elastic tube 37 …… Dog, 39 …… Limit switch 53 …… Connecting rod 55 …… Connection nut

Claims (1)

[Claims] 1. A plunger (27) which moves up and down in association with the rotation of a crankshaft (9) in a press machine is relatively movable up and down in a slide (7) provided in the press machine so as to be vertically movable. The slide (7) is provided with a ring-shaped friction member (31) which is fitted with the plunger (27) and tightens the plunger (27) from the surroundings to integrally connect the plunger (27) and the slide (7). An annular elastic tube (35) for pressing the friction member (31) against the plunger (27) to apply a tightening force to the slide (7) with a structure surrounding the friction member (31). When the slide (7) is overloaded and a relative vertical movement occurs between the slide (7) and the plunger (27), the relative vertical movement is detected. The pressure oil in the elastic tube (35) was released. Press machine characterized by comprising providing a sensor (39).