JPH08197300A - Breakthrough reduction device for press machine - Google Patents

Abstract

(57) [Abstract] [Purpose] Efficiently reduce breakthroughs to prevent noise and mechanical life reduction due to vibration and shock. [Structure] A crown 1c in which a slide drive mechanism is housed on a plurality of uprights 1b erected on a bed 1a.
In the press machine in which the slide 4 that is vertically driven by the slide drive mechanism is provided below the crown 1c, the press machine is provided at symmetrical positions with respect to the center of the left and right uprights 1b and symmetrical positions with respect to the center of the front and rear uprights 1b. A plurality of points 5 connecting the slide 4 and the slide driving mechanism, a plurality of slide guides 6 for guiding the vertical movement of the slide 4 and a plurality of breakthrough buffering means 8 are provided, so that the breakthrough buffering means 8 is more efficient. Since this can be reduced, it is possible to prevent noise and reduction in machine life due to vibrations and impacts generated by breakthrough.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breakthrough reducing device for a press machine for alleviating vibrations and shocks caused by breakthroughs.

[0002]

2. Description of the Related Art In a conventional press machine, for example, when punching is performed, a breakthrough occurs at the same time as punching a work, and the breakthrough causes vibrations and impacts, which causes noise and machine life to be shortened. . In order to solve such a problem, for example, the actual development 61-82800
Gazette, Japanese Patent Publication No. 60-21832, and Japanese Utility Model Publication No. 61
A device for reducing the impact due to breakthrough has been proposed in Japanese Patent Publication No. 35359. The above-mentioned actual development 61-828
No. 00 and No. 61-35359,
The main body provided on either one of the slide and the bolster generates hydraulic pressure at the same time as the breakthrough, and the hydraulic pressure is attenuated by the orifice to reduce the impact due to the breakthrough.

In Japanese Patent Publication No. 60-21832, a shock absorber device provided on both sides of a lower portion of a C frame is pierced from above by a projecting rod provided on an upper portion of the C frame immediately after a breakthrough occurs. The shock absorber device is configured to absorb a shock.

[0004]

However, the impact reducing device of any of the above publications is effective for a press machine in which the press main body is composed of a C frame, but for example, a straight type having four uprights. When applied to a machine such as a side press machine in which deformation due to breakthrough occurs concentratedly on an upright or a crown, a sufficient reduction effect cannot be obtained. Also, when a shock absorber device is installed between the slide and the bolster, the effective space on the left and right is narrowed by the shock absorber device, which impairs workability and safety. If the slide is tilted due to the difference, in the case of a straight side frame press, smooth up and down movement of the slide is hindered,
There was a problem that excessive force was generated in the slide guide part and the life of this part was shortened early. The present invention has been made in order to solve such a problem, and an object thereof is to provide a breakthrough reducing device suitable for a press machine having a straight side.

[0005]

In order to achieve the above object, the present invention provides a crown in which a slide drive mechanism is housed on a plurality of uprights that are erected on a bed, and below the crown. In a press machine equipped with a slide that is vertically driven by a slide drive mechanism,
A plurality of points that connect the slide and the slide drive mechanism, a plurality of slide guides and a plurality of breaks that guide the vertical movement of the slide at symmetrical positions with respect to the center of the left and right uprights and symmetrical positions with respect to the center of the front and rear uprights. The through buffer means is provided. The breakthrough buffering means is installed between the bed and the slide between the front and rear uprights outside the both end surfaces of the bolster mounted on the bed.

[0006]

[Operation] With the above configuration, the slide descends near the bottom dead center, and at the same time when breakthrough occurs, a plurality of slides are placed symmetrically with respect to the center of the left and right uprights and symmetrically with respect to the center of the front and rear uprights. The breakthrough buffering means efficiently absorbs vibration and shock due to breakthrough. Further, since the breakthrough cushioning means is arranged outside the facing surface of the left and right uprights, it does not interfere with the work at the time of press work or die replacement.

[0007]

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially cutaway front view of a straight side press machine, FIG. 2 is a lateral cross-sectional view of the same, and FIG. 3 is an enlarged cross-sectional view of breakthrough cushioning means. In these figures, reference numeral 1 denotes a press body, in which four uprights 1b are erected at four corners of a bed 1a, and a crown 1c accommodating a slide drive mechanism (not shown) is installed on the uprights 1b. The crown 1c and the bed 1a are connected by a tie rod 2 inserted in each upright 1b, and the bed 1a is provided below the crown 1c.
A slide 4 connected to the slide drive mechanism via a point 5 provided outside the both end surfaces of the bolster 3 installed above and at the center between the front and rear uprights 1b is provided so as to be vertically movable. ing. The slide 4 has liner 6a provided at the four corners and front and rear uprights 1
It is slidably slidably contacted to a slide guide 6 laid on the opposite surface of b, and is vertically moved along the slide guide 6 by a slide drive mechanism.

Between the corners of the slide 4 and the bed 1a, a plurality of, for example, four sets of breakthrough cushioning means 8 are installed. The breakthrough buffer means 8
Is the operating rod 8a provided on the slide 4 side and the bed 1a
It is composed of a buffer cylinder 8b which is installed above and which generates hydraulic pressure when the operating rod 8a abuts from above and a damping means 8c such as a throttle which attenuates the generated hydraulic pressure. These buffering means 8 are arranged at symmetrical positions with respect to the center of the left and right uprights 1b and symmetrically with respect to the center of the front and rear uprights 1b in order to reduce breakthrough efficiently and not to disturb the work at the time of press work or die replacement. And outside the facing surface of the left and right uprights 1b (slide guide 6
It is installed at a position closer to the side). Specifically, the straight line L ₁ connecting the centers of the tie rods 2 which are inserted into the uprights 1b, parallel to this straight line L _1, and on a straight line L ₃ substantially through the middle of the straight line L ₂ passing through the center point 5 2 and in the vicinity of the slide guide 6 installed on the upright 1b, as shown in FIG.

Next, the operation will be described. The slide 4 starts descending from the top dead center, and an upper die mounted on the lower surface of the slide 4 and a lower die fixed on the bolster 3 (both not shown). When a work is punched, the upper die comes into contact with the work to start punching, and the press load causes deformation of the upright 1b, the crown 1c, the slide 4, and the like. When the slide 4 reaches the bottom dead center and the punching of the work is completed, the press load is rapidly released (breakthrough), so that the upright 1b, the crown 1c, the slide 4, etc. which have been deformed until now are in the original state. A large downward force is generated on the slide 4 in order to return to. Due to this large downward force, the operating rod 8a provided on the slide 4 pressurizes the piston 8d in the buffer cylinder 8b installed on the bed 1a more strongly from above.
A large hydraulic pressure is generated in the buffer cylinder 8b at the same time when breakthrough occurs. Then, the hydraulic pressure is damped by the damping means 8c, so that the vibration and shock generated by the breakthrough are reduced.

Further, the vibration and shock due to breakthrough are
Since almost 75% of the whole is generated on the press body 1 side, most of the vibrations and impacts due to breakthrough can be absorbed by the cushioning means 8 and, if an unbalanced load occurs during machining of the work, it is installed on the left and right. Since the reaction force of the buffering means 8 is different, the slide 4 tends to be always inclined due to breakthrough. In order to prevent this, the eccentric load acting on the slide 4 can be corrected by changing the buffering effect of the left and right buffering means 8 in advance so as to correct the inclination of the slide 4 due to breakthrough, so that the slide 4 can be corrected. The smooth vertical movement of the slide guide 6 can be performed, which enables highly accurate processing and also prevents the slide guide 6 from being prematurely worn.

Although the buffer means 8 is provided inside the slide guide 6 (on the side of the bolster 5) in the above embodiment, it may be provided outside the slide guide 6. In the above embodiment, the number of applied 1b is four, but the number of uprights 1b is four.
The present invention can be similarly applied to a press machine having more than two books.

[0012]

As described above in detail, the present invention has a plurality of breakthroughs at positions symmetrical to the center of the left and right uprights and symmetrical to the center of the front and rear uprights and outside the end face of the bolster. Since cushioning means are provided to absorb the vibrations and impacts generated by breakthroughs by these cushioning meanss, it is possible to efficiently reduce most of the vibrations and impacts caused by breakthroughs generated in the press body of the straight side press. You can Also, by locating the cushioning means outside the facing surfaces of the left and right uprights, the cushioning means does not get in the way during press work or die exchange, so that press work or die exchange can be performed safely and efficiently. become. Further, even if the slide tends to incline due to an unbalanced load, this can be suppressed by the left and right cushioning means, so that highly accurate processing is possible and the life of the mold, slide guide portion, etc. can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a press machine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a press machine according to an embodiment of the present invention.

FIG. 3 is an enlarged sectional view showing a breakthrough reducing device for a press machine according to an embodiment of the present invention.

[Explanation of symbols]

 1a ... bed 1b ... upright 1c ... crown 4 ... slide 5 ... point 6 ... slide guide 8 ... breakthrough buffering means

Claims (2)

[Claims] 1. A crown 1c accommodating a slide drive mechanism is provided on a plurality of uprights 1b erected on a bed 1a, and a slide 4 vertically driven by the slide drive mechanism is provided below the crown 1c. In the provided press machine, a plurality of points 5 connecting the slide 4 and the slide driving mechanism and a vertical movement of the slide 4 are arranged at symmetrical positions with respect to the center of the left and right uprights 1b and symmetrical positions with respect to the center of the front and rear uprights 1b. A breakthrough reducing device for a press machine, which is provided with a plurality of slide guides 6 and a plurality of breakthrough cushioning means 8. 2. The breakthrough cushioning means 8 for the bed 1
The breakthrough reducing apparatus for a press machine according to claim 1, wherein the breakthrough reducing apparatus is installed between the slide 1 and the bed 1a between the front and rear uprights 1b outside the both end surfaces of the bolster 3 mounted on a.