JP2000042797A - Press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the structure of a whole press simple and to make assembling easy by eliminating a tie rod. SOLUTION: A crown 5, a bed 2 and a bolt 6 are respectively connected to the upper/lower ends of left/right uprights 3A, 3B, the reaction force of pressure force of a slide 7 is received by these bolts 6. The slide 7 is connected to the crown 5 by link mechanisms 8A, 8B, these link mechanisms 8A, 8B are driven by a rod 52 of a hydraulic cylinder 51.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a press machine,
In particular, the present invention relates to a press machine capable of obtaining a large pressing force with a small and simple structure.

[0002]

2. Description of the Related Art FIG. 7A shows an example of a conventional press machine. In the figure, uprights 93A, 93 are provided at right and left positions between a crown 91 and a bed 92 located at the top and bottom.
B is erected, and a slide 95 positioned opposite the bolster 94 on the bed 92 is moved up and down along the uprights 93A and 93B by a known crank mechanism provided in the crown. Near the bottom dead center of the slide 95, the upper die 96 provided on the lower surface thereof comes into pressure contact with the lower die 97 provided on the upper surface of the bolster 94 to generate a pressing force, and the reaction force causes the crown 91 and the bed 92 to be separated from each other. Act between them. Therefore, the uprights 93A and 93B are made hollow, and a tie rod 98 is passed therethrough. A nut 981 is connected to the upper and lower ends of the tie rod 98 projecting above the crown 91 and below the bed 92, thereby connecting the crown 91 and the bed 9
2 is regulated so as not to be separated from each other.

[0003]

However, when inserting the tie rod into the upright, if the tie rod is to be inserted from above, it is necessary to remove the ceiling at the place where the press is installed.
In addition, when the tie rod is inserted into the upright from below, a large-scale facility and work are required, such as a need for a deep pit. Also, when assembling the tie rod, it is necessary to heat the tie rod once with a heater or the like and then tighten the crown and the bed by cooling and shrinking. Further, since the upright through which the tie rod is passed needs to be hollow, the structure is complicated, and there is a problem that the outer diameter of the upright becomes large in order to secure a necessary sectional area.

Accordingly, an object of the present invention is to solve such a problem, and an object of the present invention is to provide a press machine which does not require a tie rod and realizes a simplified structure of the entire machine and easy assembly.

[0005]

According to the first aspect of the present invention, the left and right uprights (3A, 3A) are provided.
B) Crown (5) and bed (2) at the upper and lower ends respectively
Are connected by bolts (6), and the uprights (3A, 3B) receive the reaction force of the pressing force of the slide (7) via the bolts (6).

In the first invention, when a pressing force is generated near the bottom dead center of the slide, the reaction force acts on the crown and the bed to separate them. The reaction force is transmitted to each of the right and left uprights via bolts connecting the crown and the bed to the upright, and the uprights extend and deform within the elastic limit to receive the reaction force. According to the first aspect of the present invention, since it is not necessary to provide a tie rod, the structure of the press machine is simplified and the assembling work is also facilitated. Also, since it is not necessary to hollow the upright to pass the tie rod, a solid plate or column can be used as the upright, which also simplifies the structure of the press machine, The outer diameter of the upright can also be reduced.

In the second invention, the bolt (6) is passed through the crown (5) or the bed (2) and the head (61) is provided at the upper end or lower end of the upright (3A, 3B).
Screw the bolt (6) with the head (6)
1) A plurality of screw holes (611) are provided at a plurality of positions on the outer periphery, and small-diameter auxiliary bolts (62) are screwed into the holes so that each auxiliary bolt (62) is pressed against the surface of the crown (5) or the bed (2). Turn the auxiliary bolt.

In the second aspect of the present invention, the large-diameter bolt is screwed into the upper or lower end of the upright while the head is lifted, so that an excessive force is not required for the screwing. In this state, when the auxiliary bolt is rotated to press the auxiliary bolt against the surface of the crown or bed, the crown or bed and the upright are firmly connected.
In this case, the bonding strength of the auxiliary bolt is set to be about 20 to 30% higher than the required pressing force. According to the second aspect of the present invention, it is not necessary to screw the large-diameter bolt to the end, so that it is possible to avoid an increase in the size of the tool.

In the third invention, one end is rotatably connected to the crown (5) and the other end is rotatably connected to the slide (7).
Both legs (85, 8) are driven by a linearly moving driving body (52).
6) to provide a V-shaped knuckle link which can be expanded or narrowed. In the third aspect of the invention, the knuckle link slows down the slide sufficiently near the bottom dead center, so that a sufficient pressure can be obtained with a simple structure.

[0010] The reference numerals in parentheses indicate the correspondence with specific means described in the embodiment described later.

[0011]

FIG. 1 is a front view of a half section of a press machine. The left half of the figure shows a state where the slide is near the bottom dead center, and the right half of the figure shows a state where the slide is near the top dead center. In FIG. 1, the upper die and the lower die are not shown. In FIG. 1, spacer frames 1A and 1B are provided on a floor F so as to extend parallel to the left and right positions in the direction perpendicular to the paper.
And the bed 2 is placed and fixed thereon.
The bed 2 has a flat upper surface, and the lower surface thereof is depressed leaving a peripheral wall 21, and the die cushion 3 is inserted into this space.
Are arranged.

On the upper surface of the bed 2, thick solid plate-like uprights 3A and 3B are erected at left and right ends, and a bolster 4 is mounted on the upper surface of the bed 2 excluding the left and right ends.
At the upper ends of the left and right uprights 3A, 3B extending parallel upward, a crown 5 is erected horizontally, and the lower ends of the uprights 3A, 3B, the bed 2, and the uprights 3
The upper ends of A and 3B and the crown 5 are respectively connected by bolts 6. Bolt 6 is upright 3A, 3
A plurality (e.g., six) of the crowns B are provided in the longitudinal direction of the horizontal cross section (that is, in the direction perpendicular to the paper surface), and are inserted and coupled from above both ends of the crown 5 or below both ends of the bed 2.

FIG. 2 shows a bolt 6 for connecting the crown 5 and the upright 3A, and FIG.
1 shows an enlarged plan view of FIG. The large-diameter bolt 6 has the lower half screw portion 63 screwed into the upright 3A, and the circular head 61 has small-diameter screw holes 611 at a plurality of locations on the outer peripheral portion. A small-diameter auxiliary bolt 62 is screwed into these screw holes 611, and the auxiliary bolt 62 is a hexagon socket head bolt. The large-diameter bolt 6 is in a state where the head 61 is lifted as shown in FIG. 2 without being screwed to the end. In this state, when a tool is inserted into the hexagonal hole of the head and each auxiliary bolt 62 is rotated so as to advance toward the surface of the crown 5, the tip of each auxiliary bolt 62 is fitted into the bolt 6 and the crown 5 is inserted. Washer 6 located on the surface of
4 is pressed. Thereby, the crown 5 and the upright 3A are firmly connected. According to such a structure, it is not necessary to screw the large-diameter bolt 6 to the end, so that an increase in the size of the screwing tool can be avoided. The structures of the bolts 6 connecting the crown 5 and the uprights 3B and the bed 2 and the uprights 3A and 3B are the same as described above.

In FIG. 1, left and right uprights 3A, 3
B, a slide 7 is disposed along the slide B so that the slide 7 can move up and down.
A and 8B are connected to the lower surface of the crown 5.
Each of the link mechanisms 8A and 8B has shaft supports 81 and 82 fixed to the lower surface of the crown 5 and the upper surface of the slide 7, respectively, and the shafts 83 and 8 supported by these shaft supports 81 and 82.
4, the base ends of the link arms 85 and 86 are rotatably connected. Both link arms 85 and 86 are rotatably connected at their distal ends by a shaft member 87 to form a knuckle link. A hydraulic cylinder 51 is provided on a central upper surface of the crown 5 in a vertical posture, and a rod 52 protruding from the hydraulic cylinder 51 extends downward through the crown 5. The tip of the rod 52 and the left and right link arms 85 are connected by a connecting link 88. When the rod 52 retreats into the hydraulic cylinder 51, the link arm 85 is pulled up and rotated (right half in FIG. 1), whereby the entire knuckle link becomes V-shaped, and the slide 7 moves to the top dead center. Can be raised. On the other hand, the rod 52 is
1, the link arm 85 is pushed down and rotated (the left half in FIG. 1), and the knuckle link is expanded until the link arms 85 and 86 constituting the V-shaped both legs become straight, The slide 7 is lowered to the bottom dead center.

FIGS. 4 and 5 show the stroke St (mm) of the rod 52 until the shaft piece 82 (ie, the slide 7) is raised from the bottom dead center to the top dead center by the link mechanism.
And an example of a change in the slide lift amount L (mm). FIG.
In (A), (B), (C) and (D), the stroke St is 0, 90.92, 119.24, 136.37, 16
While changing to 4.53, the slide lift amount L becomes 0, 1,.
00, 3.00, 5.00, and 10.00. Further, in FIGS. 5A, 5B, 5C, and 5D, the stroke St is 199.70, 325.00, 414.46,
While changing to 547.55, the slide lift amount L is 2
0.00,100.00,200.00,400.00
And change. This is shown graphically in FIG. As is apparent from FIG. 6, the moving speed of the slide is sufficiently low near the bottom dead center, and as a result, the relatively small hydraulic cylinder 5
1, sufficient pressure can be generated.

When a pressing force is generated at the bottom dead center of the slide 7, a reaction force of the same magnitude acts on the crown 5 and the base 2 so as to separate them. Here, this reaction force is received by each bolt 6 connecting the crown 5 and the bed 2 to the uprights 3A, 3B, and transmitted to the uprights 3A, 3B via these bolts 6,
These uprights 3A and 3B extend and deform within the elastic limit. According to the inventor's experiment, the left and right uprights 3
A and 3B each have a thickness of 150 mm and a width of 500 mm
When the crown 5 and the bed 2 are connected to the uprights 3A and 3B with six bolts 6 each having an outer diameter of 42 mmφ and a coupling length of a screw portion of 80 mm using the SS steel plate of No. 7,
A sufficient pressing force of about 00 t can be obtained.

FIG. 7 shows a conventional press described above (FIG. 7).
(A)) and the size of the press machine of the present invention (FIG. 7 (B)) are compared. The press machine of the present invention does not require much labor when assembling the tie rods, and is evident from FIG. As a result, the overall shape is smaller than that of a conventional press.

In the above-described embodiment, the rod 52 that moves linearly to drive the link mechanism is connected to the hydraulic cylinder 51.
, But may be operated by a crank.

[0019]

As described above, according to the press machine of the present invention, no tie rod is required, so that the structure of the whole machine can be simplified and the assembling can be facilitated. Demonstrate pressure.

[Brief description of the drawings]

FIG. 1 is a half sectional front view of a press machine showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a bolt connection part.

FIG. 3 is an enlarged plan view of a bolt head.

FIG. 4 is a front view showing the operation of the link mechanism.

FIG. 5 is a front view showing the operation of the link mechanism.

FIG. 6 is a graph showing a relationship between a rod stroke and a slide lift amount.

FIG. 7 is an overall front view comparing the size of a conventional press and the size of the press of the present invention.

[Explanation of symbols]

2 bed, 3A, 3B upright, 5 crown, 52 rod, 6 bolt, 7 slide, 85,
86 ... Link arm.

Claims (3)

[Claims] 1. A press machine wherein a crown and a bed are respectively connected to upper and lower ends of right and left uprights by bolts, and a reaction force of a slide pressing force is received by the uprights via these bolts. . 2. The bolt is passed through the crown or bed and screwed into the upper or lower end of the upright with its head floating, and screw holes are provided at a plurality of positions on the outer periphery of the head of the bolt. The press machine according to claim 1, wherein the auxiliary bolts are screwed in and the auxiliary bolts are rotated so that each auxiliary bolt is pressed against the crown or the surface of the bed. 3. A V-shaped knuckle link, one end of which is rotatably connected to the crown and the other end of which is rotatably connected to the slide, wherein both legs are expanded or narrowed by a linearly-moving driver. The press machine according to 1.