JPH08174295A - Press - Google Patents

Abstract

PURPOSE: To improve the dynamic precision of a press by restricting the bed from deforming caused by the pressing load. CONSTITUTION: In a press of being formed with standing members 2a to erect uprights 3 at a corner part of a bed 2 as one body with the bed 2, a reinforcing rib 2e which is positioned on the upper side of a main rib 2b of the bed 2 and installed continuously between right and left standing members is installed with projecting on the upper face of the bed 2, and a recessing groove 8a in which the reinforcing rib 2e is fitted is formed on the bottom face of a bolster 8 mounted on the bed 2 at the same time. Then, because the central part of the bed 2 being going to bend downward caused on the pressing load is restricted with the reinforcing rib, and the uprights 3 erected on the standing member 2a is prevented from falling inside, so the dynamic precision of the press is improved, and highly precise pressing can be executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press machine having improved dynamic accuracy by suppressing deformation of a press body due to a press load.

[0002]

2. Description of the Related Art Conventionally, in a press machine such as a straight side press, the press body is composed of a bed, an upright standing upright on the bed, and a crown mounted on the upright. The tie rods that are inserted into the upright are firmly connected between the and. Further, in the press machine having the above-mentioned configuration, when the press body is deformed by the press load during the press work, the dynamic accuracy is lowered and it becomes impossible to perform the highly accurate molding. Therefore, conventionally, various means for preventing the press body from being deformed due to the press load have been proposed and implemented.

For example, in Japanese Unexamined Patent Publication No. 63-256298, a press is provided by providing column-shaped rising members for connecting to columns at four corners of the bed integrally with the bed and providing rib members inside these rising members. A frame of a press machine has been proposed in which the bed is prevented from bending due to a load, and as a result, the dynamic accuracy of the press is improved.

[0004]

However, as in the press machine of the above-mentioned publication, in the case where rib members connecting the left and right rising members are provided in front of and behind the bed, a bolster mounted on the bed is used. Since the rib members are located in the front and back of the bolster, it is difficult to install a drawer rail or the like used when changing the mold on the bolster, which hinders mold replacement and also fixes the mold to the bolster. Since the rib member is a hindrance when installing the clamper and fixing device of
There is a problem that work takes time and work efficiency is poor. In addition, since the molds are automatically replaced, even if an automatic replacement device is arranged before and after the press, the rib member interferes, and the arrangement is restricted or cannot be arranged.
There are also problems such as automatic die replacement. The present invention has been made to improve such conventional problems, and an object thereof is to provide a press machine capable of suppressing deformation of the bed without impairing workability, and to improve dynamic accuracy. is there.

[0005]

In order to achieve the above object, the present invention provides a press machine in which a rising member for uprighting an upright is integrally formed with a bed at a corner portion of the bed. , A reinforcing groove that is located substantially above the main rib of the bed and that connects the left and right rising members in a continuous manner, and a recessed groove into which the reinforcing rib fits on the bottom surface of the bolster mounted on the bed. Is formed.

Further, in a press machine having a C-shaped frame, rising members are formed on both sides of an upper part of a bed provided at the lower part of the C-shaped frame, and on the upper surface of the bed, substantially above the main frame of the bed. Reinforcing ribs that are located and continuous between the rising members are provided in a protruding manner, and a concave groove into which the reinforcing ribs are fitted is formed on the bottom surface of the bolster placed on the bed.

[0007]

[Operation] With the above configuration, even if the central portion of the bed bends downward due to the pressing load during press forming, the reinforcing ribs protruding from the upper surface of the bed suppress this, so that it was erected on the left and right rising portions. It is possible to prevent the upright from falling inward.

[0008]

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings. 1 is an overall front view of the press machine, FIG. 2 is an enlarged front view of the bed, FIG. 3 is a cutaway plan view of the same portion, and FIG. 4 is a sectional view taken along the line AA of FIG. In FIG. 1, reference numeral 1 is a press body, which is placed between a bed 2, four uprights 3 standing upright on a column-shaped standing member 2a formed at the four corners of the bed 2, and the upper ends of these uprights 3. The crown 4 is formed, and the bed 2 and the crown 4 are firmly connected to each other by a tie rod 5 inserted in the upright 3.

Reference numeral 6 denotes a slide provided below the crown 4, which is vertically driven by a slide driving mechanism (not shown) provided in the crown 4, and four corners of the slide 5 are slide guides laid on the upright 3. 7
Is guided by sliding.

On the other hand, as shown in FIG. 2 and below, the bed 2 has main ribs 2b which are separated from each other in the front-rear direction and are parallel to each other, and the square holes 2c are provided between the upper ends of the main ribs 2b.
Is provided on the upper surface of the upper surface plate 2d, and a pair of reinforcing ribs 2e are provided on the upper surface of the upper surface plate 2d so as to be parallel to each other and located above the main ribs 2b. As shown in FIG. 4, these reinforcing ribs 2e have a prismatic shape with a rectangular cross section, and are integrated with the upper surface plate 2d.
Both end portions reach the rising portion 2a, and arcuate notches 2f are formed in a continuous portion with the rising portion 2a to prevent stress from concentrating on this portion.

Further, a rib member 2g is provided at the front and rear ends of the upper plate 2d so as to connect the left and right rising members 2a in a continuous manner. The rib member 2g is formed at substantially the same height as the upper plate 2d. There is. Reference numeral 8 in FIGS. 3 and 4 denotes a bolster mounted on the bed 2, and two recessed grooves 8a slightly larger than the width and height of the reinforcing rib 2e are formed on the bottom surface to avoid interference with the reinforcing rib 2e. The reinforcing ribs 2e are loosely fitted in the recessed grooves 8a.

Next, the operation will be described. Of the molds used for press molding, the upper mold is attached to the lower surface of the slide 6,
The lower mold (both not shown) is placed on the bolster 8,
Each is fixed by a clamper (not shown). Then, in this state, the work is carried in between the upper mold and the lower mold, the slide 6 is lowered by a slide driving mechanism (not shown), and the work is press-molded between the upper mold and the lower mold.
The central portion of the bed 2 is bent downward by the press load generated at the time of molding, and the upright 3 standing on the bed 2 is erected.
Tries to fall inward. However, the top plate 2d of the bed 2
Reinforcing ribs 2e are provided on the upper surface of the main ribs 2b for receiving a pressing load so as to prevent the central portion of the bed 2 from bending downward, and at the same time to prevent the left and right rising members 2a from bending inward. Moreover, the upright 3 can be prevented from falling inward. As a result, the dynamic accuracy of the press machine is improved, and the molding accuracy is also improved. Although the above embodiment is for a straight side press, it can be applied to a press machine that employs a C-shaped frame shown in FIGS. 5 and 6. That is, on the upper surface of the bed 2 provided in the lower portion of the C-shaped frame 1a, above the main rib 2b, and
Reinforcing ribs 2e are provided so as to continuously connect between the rising members 2a provided on both sides of the upper part of the. Further, a concave groove into which the reinforcing rib 2e is loosely fitted is formed on the bottom surface of the bolster placed on the bed 2. As a result, the upper surface of the bolster mounted on the bed 2 does not become high, and the reinforcing ribs 2e prevent the central portion of the bed 2 from bending downward due to the press load, so that both side plates of the C-shaped frame 1a are prevented. It is prevented from inclining to the inner side, whereby the dynamic accuracy can be improved similarly to the above-mentioned embodiment. Further, in this embodiment, the reinforcing rib 2e is installed above the main rib 2b in order to enhance the force transmission effect, but the position is not limited as long as it is below the bolster 8.
The effect is substantially the same even if it is slightly displaced from the main rib 2b.

[0013]

As described in detail above, according to the present invention, the reinforcing ribs are provided on the upper surface of the bed so as to connect the left and right rising members provided on both sides of the upper portion of the bed and above the main rib of the bed. Therefore, even if the central part of the bed tries to bend downward due to the press load during press molding,
Since the reinforcing ribs suppress this, the rising members on both sides of the bed are not deformed inward, and the uprights standing on the rising members do not fall inward. As a result, the deformation of the press body can be significantly suppressed, so that the dynamic accuracy of the press machine is improved and press molding with high accuracy becomes possible. Also, since there are no reinforcing ribs on the front and rear of the bolster, it is possible to provide the bolster with a drawer rail that is used during die replacement, so that die replacement work can be done efficiently in a short time, and clampers, fasteners, etc. Since the detaching work is not disturbed by the reinforcing ribs, workability is also improved. Also, by forming a groove on the bottom surface of the bolster to which the reinforcing rib fits, the height of the upper surface of the boss is not increased, so workability during die replacement and press work is not impaired. As compared with the case where the bed is made thicker to increase the rigidity, the weight of the bed itself is not increased, so that transportation and installation can be facilitated. Moreover, since the reinforcing ribs are formed on the upper surface of the bed and the concave groove is formed on the bottom surface of the bolster, the area of the contact surface between the bed and the bolster that requires precision processing is reduced, so that the processing can be facilitated and the cost can be reduced accordingly. become.

[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 front view showing the bed of the press machine according to the embodiment of the present invention.

FIG. 3 is a partially cutaway plan view showing a bed of a press machine according to an embodiment of the present invention.

4 is a sectional view taken along the line AA of FIG.

FIG. 5 is a partially cutaway side view of a press machine according to another embodiment of the present invention.

FIG. 6 is a front view of a bed portion of a press machine according to another embodiment of the present invention.

[Explanation of symbols]

 2 ... Bed 2a ... Standing member 2b ... Main frame 2e ... Reinforcing rib 3 ... Upright 8 ... Bolster 8a ... Recessed groove

Claims (2)

[Claims] 1. A press machine in which a rising member 2a for standing an upright 3 is formed integrally with a bed 2 at a corner portion of the bed 2, the upper surface of the bed 2 being substantially above the main rib 2b of the bed 2. Reinforced ribs 2e that are positioned and that continuously connect the left and right rising members 2a are provided in a protruding manner.
A press machine in which a concave groove 8a into which the reinforcing rib 2e is fitted is formed on the bottom surface of a bolster 8 placed on the bed 2. 2. In a press machine having a C-shaped frame 1a, rising members 2a are formed on both sides of an upper portion of a bed 2 provided at a lower portion of the C-shaped frame 1a, and a bed 2 is provided on an upper surface of the bed 2. A reinforcing rib 2e which is located substantially above the main frame 2b and which continuously connects the rising members 2a, and the reinforcing rib 2e is formed on the bottom surface of the bolster 8 mounted on the bed 2. A press machine having a concave groove 8a formed therein.