JP2023056512A - Bead structure and press machine having the same - Google Patents

Abstract

To provide a bed structure which has sufficient rigidity even when a press load is increased, and can be divided, and a press machine having the same.SOLUTION: Provided is a bed structure 1 used in a press machine A including: a hollow quadrangular column-like inner frame part 10 having a first hollow part 10a; a hollow quadrangular column-like outer frame part 20 having a second hollow part 20a; and leg parts 30 provided on each of right and left ends of the outer frame part 20, wherein the inner frame part 10 is arranged in the second hollow part 20a, the outer frame part 20 is composed of a splittable front side outer frame part 21 which is positioned on the front side of the inner frame part 10 and has a U shape in top view, and a rear side outer frame part 22 which is positioned on the rear side of the inner frame part 10 and has a U shape in top view, the inner frame part 10 and the outer frame part 20, and the outer frame part 20 and the leg part 30 can be attachable/detachable to/from each other. Also provided is the press machine A having the same.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bed structure and a press machine having the same, and more particularly, to a bed structure that has excellent rigidity even when the press load is increased and that can be divided into a plurality of parts, and the same. It relates to a press machine equipped.

Press working is so-called plastic working in which a workpiece is sandwiched between dies and molded into the shape of the dies. A press machine is generally used in press working.
The press machine has a bed portion, a slide portion, a crown portion, and the like, and by mechanically and continuously performing press working, it is possible to mass-produce pressed products.

In recent years, for workpieces used in press working, so-called high-tensile steel (high-tensile steel), which has superior strength compared to steel, and ultra-high-tensile steel (ultra-high-tensile steel), which exceeds that strength, are being used as materials to replace general steel. New materials such as
Since these new materials have excellent strength as described above, it is possible to further improve strength with the same thickness as conventional steel materials, or to reduce weight by thinning while maintaining the same strength as conventional steel sheets. becomes possible.

By the way, since a work using such a new material has excellent strength, it cannot be sufficiently plastically worked with a general press load, and it is necessary to increase the press load.
In order to increase the press load in the press machine, it is necessary to increase the size of the bed portion and impart sufficient rigidity to the bed portion.
On the other hand, if the bed section is enlarged, there is a drawback that transportation for installing the bed section becomes difficult. That is, since there is a load limit for automobiles stipulated in Article 22 of the Enforcement Order of the Road Traffic Law (hereinafter simply referred to as "load limit for automobiles based on the Road Traffic Law"), it is necessary to comply with this when transporting the bed section. .

On the other hand, a technique for dividing the bed is known.
For example, a frame structure (bed portion structure) of a press machine, in which the components constituting the frame of the press machine are detachably connected to a bed body and a divided portion divided from the bed body, the bed body and the divided portion has known a split frame structure of a press machine provided with fitting portions that are directly fitted to each other (see, for example, Patent Document 1).
Also, a bed (bed section) divided into a main body and divided bodies provided on the left and right sides of the main body (bed section), columns arranged at the four corners of the bed and on the upper surface of the divided bodies, and columns provided above the columns tie rods that pass through the divisions, columns, and crowns and vertically tighten them; and connecting members that integrally connect the main body and the divisions. Propagating mechanisms are provided for propagating the press load therebetween, each propagating mechanism being provided on the segments and having a stepped support portion with an upwardly facing support surface, and a stepped support portion provided on the main body and resting on the support surface. A press machine frame is known which includes a stepped supported portion having a supported surface on which the support is placed, and the supported surface is provided at or below the center of the main body in the height direction. (See, for example, Patent Document 2).
Also, a bed of a press machine, the frame of which is composed of a crown, a bed, and a main tie rod that connects the crown and the bed, the bed of the press machine comprises an upper center bed and a center positioned below the upper center bed. The bed (bed portion) of the press machine is constructed by fastening a lower bed and a pair of side beds arranged at positions sandwiching the central upper bed and the central lower bed from both sides and connected to main tie rods. (See Patent Document 3, for example).

Japanese Patent Application Laid-Open No. 2003-320500 JP 2013-128959 A JP 2013-128971 A

Since the bed parts described in Patent Documents 1 to 3 are divisible, they can be transported by being split. As a result, it is possible to install a large bed section at a desired position.
However, the bed portions described in Patent Documents 1 to 3 do not necessarily have sufficient rigidity when the press load is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bed structure which has sufficient rigidity even when the press load is increased and which can be divided, and a press machine equipped with the same. With the goal.

As a result of intensive studies to solve the above problems, the inventors of the present invention have a double structure of an inner frame portion and an outer frame portion, and the outer frame portion is divided into a front outer frame portion and a rear outer frame portion. The present inventors have found that the above-mentioned problems can be solved by forming a part, and have completed the present invention.

The present invention relates to a bed structure used in a press machine, in which a hollow quadrangular prism-shaped inner frame portion having a first hollow portion, a hollow quadrangular prism-shaped outer frame portion having a second hollow portion, and right and left sides of the outer frame portion are provided. and leg portions provided at respective ends of the inner frame portion disposed in the second hollow portion, the outer frame portion being a splittable U-shaped portion located in front of the inner frame portion. and a U-shaped rear outer frame portion located on the rear side of the inner frame portion. It is a bed structure that is detachable from each other.

In the bed structure of the present invention, the front outer frame portion has a front wall portion and first side wall portions projecting rearward from both ends of the front wall portion, and the rear outer frame portion has a rear wall portion. and second side wall portions protruding forward from both ends of the rear wall portion. is preferably provided.

In the bed structure of the present invention, the inner wall surface of the front outer frame portion and the inner wall surface of the rear outer frame portion are each provided with a support base portion protruding inward, and the inner frame portion is attached to and detached from the support base portion. Preferably, the outer wall surface of the inner frame portion, the inner wall surface of the front outer frame portion, and the inner wall surface of the rear outer frame portion are provided with guides that contact each other. .
At this time, it is preferable that the inner frame portion is detachably attached to the support base portion from the lower surface side of the inner frame portion while being placed on the support base portion.

In the bed structure of the present invention, a plurality of partition plates that partition the first hollow portion are attached to the first hollow portion. preferably supported by side walls and parallel to each other.

The present invention provides the above-described bed structure, an upright portion erected on the bed structure, a crown portion supported by the upright portion, a drive mechanism arranged in the crown portion, and a suspension suspended from the drive mechanism. a slide portion provided on the bed structure; a bolster portion installed on the bed structure; and tie rods that penetrate the crown portion, the upright portion, and the bed structure in the vertical direction and tighten them. is moved up and down to press the workpiece between the dies arranged between the slide portion and the bolster portion.

Since the bed structure of the present invention has a double structure of the inner frame portion and the outer frame portion, the press load transmitted downward from the mold is distributed to the inner frame portion and the outer frame portion. be. As a result, the degree of bending of the bed structure during pressing can be minimized (bending reduction effect). As a result, even when the press load is increased, it is possible to exhibit sufficient rigidity. Of course, even with a normal press load, excellent rigidity can be exhibited.

Further, in the bed structure, the inner frame portion, the outer frame portion, and the outer frame portion and the leg portion are detachable from each other. and the U-shaped rear outer frame when viewed from the top, these can be separated and transported separately.
By doing so, even a large bed structure can be transported in conformance with the loading limit of automobiles based on the Road Traffic Law. can be installed.

In the bed structure of the present invention, the rear end surface portions of the first side walls projecting rearward from both ends of the front wall portion of the front outer frame portion and the rear end surfaces of the rear wall portion of the rear outer frame portion facing each other. By providing a gap between the second side wall and the front end surface of the second side wall that protrudes forward, there is a degree of freedom corresponding to the gap, making it easier to attach the front outer frame and the rear outer frame to the inner frame. There are advantages.
Further, even if deformation or vibration occurs in the front outer frame portion or the rear outer frame portion due to the press load during pressing, the first side wall portion of the front outer frame portion and the second side wall portion of the rear outer frame portion collision with parts can be suppressed.

In the bed structure of the present invention, the front outer frame portion and the rear outer frame portion are each provided with support base portions protruding inward, and the inner frame portion can be attached to and detached from these support base portions. A clearance around the inner frame portion can be secured, and attachment and detachment of the inner frame portion to the front outer frame portion and the rear outer frame portion can be facilitated.
In addition, by configuring the inner frame portion to be attached to and detached from the support base portion from the lower surface side of the inner frame portion while being placed on the support base portion, the front outer frame portion and the rear outer frame portion can be easily connected. It becomes easier to attach and detach the inner frame portion.

In the bed structure of the present invention, guides are provided on the outer wall surface of the inner frame portion, the inner wall surface of the front outer frame portion, and the inner wall surface of the rear outer frame portion, respectively, and are brought into contact with each other. By doing so, it is possible to suppress deformation and vibration of the inner frame portion due to the press load.

Since the bed structure of the present invention has the first hollow portion, it is sufficiently light in weight. , the rigidity can be sufficiently improved.

Since the press machine of the present invention includes the bed structure described above, sufficient rigidity can be exhibited even when the press load is increased. As a result, it is possible to perform stable plastic working even for workpieces using new materials such as high-tensile steels and ultra-high-tensile steels.

FIG. 1 is a perspective view showing one embodiment of a bed structure according to the present invention. FIG. 2 is an exploded view showing a state in which the bed structure shown in FIG. 1 is divided into parts. FIG. 3 is a bottom view showing the inner frame portion of the bed structure according to this embodiment. FIG. 4 is a schematic top view for explaining the positional relationship between the inner frame portion and the outer frame portion in the bed structure according to this embodiment. FIG. 5 is a front view showing one embodiment of the press machine according to the present invention. 6 is a side view of the press shown in FIG. 5. FIG. FIG. 7 is a front view for explaining the state of the press machine when a press load is generated.

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will now be described in detail with reference to the drawings as necessary. In the drawings, the same elements are denoted by the same reference numerals, and overlapping descriptions are omitted. In addition, unless otherwise specified, positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of the drawings are not limited to the illustrated ratios.

The bed structure according to the present invention corresponds to a so-called "bed" used in a press machine, and in the JIS standard press machine terminology (JIS-B0111), it is defined as "a part of the frame and a base that receives pressurization. Generally, it is defined as "a bolster and a mold are placed on it."
In addition, a press machine equipped with such a bed structure is large and can output a sufficient press load in order to perform stable plastic working on workpieces using new materials such as high-tensile steel and ultra-high-tensile steel. It is possible.

FIG. 1 is a perspective view showing one embodiment of a bed structure according to the present invention.
As shown in FIG. 1, the bed structure 1 according to the present embodiment includes an inner frame portion 10, an outer frame portion 20 surrounding the inner frame portion 10, and left and right ends of the outer frame portion 20. and a bent leg 30 .
The outer frame portion 20 includes a front outer frame portion 21 positioned in front of the inner frame portion 10 and having a U shape when viewed from above, and a U-shaped front outer frame portion 21 positioned at the rear side of the inner frame portion 10 and having a U shape when viewed from above. and a rear outer frame portion 22 .

Here, in this specification, for the sake of convenience, the direction of the short sides of the inner frame portion 10 having a rectangular top view is defined as the front-rear direction, and the direction of the long sides is defined as the left-right direction. Specifically, the lower left side of the bed structure 1 shown in FIG. 1 is the "front" side, and the upper right side is the "rear" side. Also, the horizontal direction perpendicular to the front-rear direction is defined as the left-right direction. In the press machine A shown in FIG. 5, the front side of the paper is defined as the "front" side, and the back side of the paper is defined as the "rear" side.

In the bed structure 1, the materials of the inner frame portion 10, the front outer frame portion 21, the rear outer frame portion 22, and the leg portions 30 are not particularly limited, but for example, general structural rolled steel, carbon steel, etc. are adopted. is preferred. In addition, the material of each component may be mutually the same, or may differ.

FIG. 2 is an exploded view showing a state in which the bed structure shown in FIG. 1 is divided into parts.
As shown in FIG. 2, in the bed structure 1 according to this embodiment, the inner frame portion 10 and the outer frame portion 20, and the outer frame portion 20 and the leg portions 30 are detachable from each other. The details of attachment and detachment will be described later.
Also, as will be described later, the front outer frame portion 21 and the rear outer frame portion 22 are not directly connected.

In this way, in the bed structure 1, by transporting the divided parts individually, it is possible to adapt to the vehicle loading restrictions based on the Road Traffic Law and transport them.
Moreover, after transportation, by assembling these, it becomes possible to install the large-sized bed structure 1 at a desired position.

In the bed structure 1, the inner frame portion 10 has a hollow quadrangular prism shape extending in the left-right direction.
Specifically, the inner frame portion 10 has walls 11 provided in four directions (front, back, left, and right). These wall portions 11 are connected and fixed to each other by fasteners such as bolts or by welding or the like.
A space surrounded by the wall portion 11 serves as a first hollow portion 10a penetrating in the vertical direction. As a result, the weight of the bed structure 1 itself is reduced.

In the inner frame portion 10, a plurality of partition plates 12 that partition the first hollow portion 10a are attached at regular intervals so as to be parallel to each other.
The partition plate 12 has a plate shape and is supported by the front wall portion 11 and the rear wall portion of the inner frame portion 10 . The partition plate 12 and the wall portions 11 on both sides are connected and fixed to each other by fasteners such as bolts or by welding or the like.
The upper ends of the plurality of partition plates 12 are substantially flush with the upper ends of the four walls 11 , and the lower ends of the plurality of partition plates 12 are substantially flush with the lower ends of the four walls 11 . (See Figure 3).
Since the inner frame portion 10 has the plurality of partition plates 12 in the first hollow portion 10a, the rigidity can be sufficiently improved.

In the inner frame portion 10, the thickness of the wall portion 11 is preferably 50 mm or more from the viewpoint of exhibiting sufficient rigidity even when the press load is large. It is more preferably 100 mm or less.
In addition, the thickness of the partition plate 12 is preferably 70 mm or more from the viewpoint of exhibiting sufficient rigidity even when the press load is large, and is 100 mm or less from the viewpoint of weight load and handleability. is more preferable.

In the inner frame portion 10 , a plurality of guides 13 (hereinafter also referred to as “first guides”) are provided on the outer wall surfaces of the four wall portions 11 .
Specifically, in the front wall portion 11, the first guides 13 are provided on the left and right upper portions of the outer wall surface. The rear wall portion is the same as the front wall portion 11 .
Four first guides 13 are provided at equal intervals on the upper portion of the outer wall portion of the left wall portion 11 . The wall on the right side is the same as the wall section 11 on the left side.
The first guide 13 has a plate-like shape extending in the vertical direction, and the material of the first guide 13 is not particularly limited, but general structural rolled steel, carbon steel, or the like can be used.

FIG. 3 is a bottom view showing the inner frame portion of the bed structure according to this embodiment.
As shown in FIG. 3, the inner frame portion 10 has two positioning pin holes 17 on the lower surface of the wall portion 11 on the rear side (on the lower side of the paper in FIG. 3).
A plurality of bolt holes 16 are provided in the lower surfaces of the front wall portion 11 and the rear wall portion 11, respectively.
These are for connecting to the outer frame portion 20 which will be described later.

FIG. 4 is a schematic top view for explaining the positional relationship between the inner frame portion and the outer frame portion in the bed structure according to this embodiment.
As shown in FIG. 4, in the bed structure 1, the outer frame portion 20 has a hollow quadrangular prism shape extending in the left-right direction (vertical direction in FIG. 3).
The outer frame portion 20 is composed of a front outer frame portion 21 and a rear outer frame portion 22, and both are arranged in a vertical plane including a center line X passing through the center of the outer frame portion 20 and extending in the left-right direction. On the other hand, they are plane symmetrical to each other.

The front outer frame portion 21 and the rear outer frame portion 22 are both U-shaped in top view and are arranged to face each other.
That is, the front outer frame portion 21 has a front wall portion 21a and first side wall portions 21b projecting rearward from both ends of the front wall portion 21a. and second side wall portions 22b projecting forward from both ends of the rear wall portion 22a.

In the outer frame portion 20, the thickness of the front wall portion 21a and the rear wall portion 22a is preferably 140 mm or more from the viewpoint of exhibiting sufficient rigidity even when the press load is large. From the viewpoint of handleability, it is more preferably 200 mm or less.
In addition, the thickness of the first side wall portion 21b and the second side wall portion 22b is preferably 200 mm or more from the viewpoint of exhibiting sufficient rigidity even when the press load is large. from the point of view, it is more preferably 250 mm or less.

In the front outer frame portion 21 and the rear outer frame portion 22, a plurality of guides 23 (hereinafter also referred to as "second guides") are provided on inner wall surfaces corresponding to the first guides 13 of the inner frame portion 10 described above. It is
Specifically, in the front wall portion 21a of the front outer frame portion 21, the second guides 23 are provided on the upper left and right sides of the inner wall surface, respectively. The rear wall portion 22a of the rear outer frame portion 22 is the same as the front wall portion 21a.
In addition, two second guides 23 are provided on the upper portions of the inner wall portions of the left and right first side wall portions 21b of the front outer frame portion 21, respectively. The left and right second side wall portions 22b of the rear outer frame portion 22 are the same as the first side wall portion 21a.
Therefore, the second guide 23 is provided at a position corresponding to the first guide 13 .
Like the first guide 13, the second guide 23 has a plate-like shape extending in the vertical direction. The material of the second guide 23 is not particularly limited. Rolled steel, carbon steel, etc. can be used.

In the outer frame portion 20, a gap S is provided between the rear end face portion of the first side wall portion 21b and the front end face portion of the second side wall portion 22b, which face each other.
As a result, there is a degree of freedom corresponding to the space S, so there is an advantage that the front outer frame portion 21 and the rear outer frame portion 22 can be easily attached to the inner frame portion 10 .
Further, even if deformation or vibration occurs in the front outer frame portion 21 or the rear outer frame portion 22 due to the press load during pressing, the first side wall portion 21b of the front outer frame portion 21 and the rear outer frame portion 22 can be suppressed from colliding with the second side wall portion 22b.

At this time, the shortest distance between the two in the gap S is preferably 5 to 20 mm.
If the gap S is less than 5 mm, the above-described effects may not be sufficiently obtained compared to the case where the gap S is within the above range. As compared with the case of (1), there are disadvantages that the bed structure 1 becomes unnecessarily large and the shape stability of the bed structure 1 deteriorates.

Here, the press load during pressing in the pressing machine provided with the bed structure 1 will be described.
FIG. 7 is a front view for explaining the state of the press machine when a press load is generated.
In a normal press machine P, when a press load is generated during pressing, the bed B bends downward. At this time, as shown in FIG. 7, the central portion of the bed B bends the most.
After pressing, the bent bed B quickly recovers while vibrating.
In press working, this is repeated at high speed.

Here, the degree of bending of the bed B depends on the rigidity of the bed B. As shown in FIG. The rigidity means the degree of difficulty of deformation of the device itself when a press load is generated. That is, the higher the rigidity, the more difficult it is to deform.
Therefore, by improving the rigidity, the degree of deflection is reduced, thereby improving the durability.

Returning to FIG. 4, in the inner frame portion 10, a second hollow penetrating in the vertical direction (from the front to the back of the paper in FIG. 4) is provided in the space surrounded by the front outer frame portion 21 and the rear outer frame portion 22. It has a portion 20a.
The inner frame portion 10 described above is arranged in the second hollow portion 20a (see FIG. 2).
As described above, the bed structure 1 has a double structure of the inner frame portion 10 and the outer frame portion 20, so that the press load transmitted downward from the mold is distributed between the inner frame portion 10 and the outer frame portion. 20. As a result, the degree of deflection of the bed structure during pressing can be minimized. As a result, even when the press load is increased, it is possible to exhibit sufficient rigidity. Of course, even with a normal press load, excellent rigidity can be exhibited.

In the bed structure 1 , the front outer frame portion 21 and the rear outer frame portion 22 are arranged so as to surround the inner frame portion 10 .
At this time, the inner wall surfaces of the front outer frame portion 21 and the outer frame portion 22 and the outer wall surface of the inner frame portion 10 are not in direct contact, and the first guide 13 and the second guide 23 are in contact with each other. It is Note that the first guide 13 and the second guide 23 are not connected.
As a result, deformation and vibration of the inner frame portion due to the press load can be suppressed.
Further, even if there is a vertical displacement between the inner frame portion 10 and the outer frame portion 20, the wall surface can be prevented from being damaged only by rubbing the guides.

Returning to FIG. 2, in the outer frame portion 20, the front outer frame portion 21 and the rear outer frame portion 22 are each provided with a support base portion 25 protruding inward from the lower portion of the inner surface.
The support base portion 25 has a structure that extends continuously in the width direction of the second side wall portions 22b on both sides of the rear outer frame portion 22 and in the width direction of the rear wall portion 22a, and the upper surface thereof is a horizontal surface. there is
Two positioning pin holes 27 are provided on the support base 25 on the rear wall 22a side at positions corresponding to the positioning pin holes 17 and the bolt holes 16 on the lower surface of the inner frame portion 10 shown in FIG. A plurality of bolt holes 26 are provided.
Here, in FIG. 2, the support base portion of the front outer frame portion 21 is not illustrated, but a support base portion is provided in the same manner as the rear outer frame portion 22. A plurality of bolt hole portions 26 are provided at positions corresponding to the bolt hole portions 16 on the lower surface of the inner frame portion 10 shown in FIG. No positioning pin holes are provided in the support portion of the front outer frame portion 21 .

In the bed structure 1 , when the inner frame portion 10 is placed on the support base portion 25 , positioning pins are attached to the positioning pin holes 17 of the inner frame portion 10 and the positioning pin holes 27 of the support base portion 25 . By doing so, both are positioned.
Fasteners such as bolts are attached to the bolt hole portions 16 of the inner frame portion 10 and the bolt hole portions 27 of the support base portion 25 so that the inner frame portion 10 and the outer frame portion 20 (the front outer frame portion 21 and the rear outer frame portion 22).
On the other hand, the inner frame portion 10 and the outer frame portion 20 can be separated by removing the fasteners.

As described above, in the bed structure 1, the inner frame portion 10 is placed on the support base portion 25, and the lower surface of the inner frame portion 10 and the support base portion 25 are detachable from each other. It becomes easy to attach and detach the inner frame portion to and from the outer frame portion and the rear outer frame portion. That is, it becomes possible to perform the work of removing the inner frame portion 10 from below.
Further, since the support base portion 25 protrudes inward, a clearance around the inner frame portion 10 can be secured.

In the outer frame portion 20, both the first side wall portion 21b and the second side wall portion 22b on both sides are provided with recesses R for positioning and attaching the leg portions 30. As shown in FIG.
The recess R is formed in the first side wall portion 21b and the second side wall portion 22b so as to be recessed inward from the outer surface, and is continuous with the first side wall portion 21b and the second side wall portion 22b in the left-right direction. It has a groove shape extending to
In addition, in the first side wall portion 21b and the second side wall portion 22b on both sides, a pair of retaining holes 28 are provided respectively on the upper side and the lower side of the recess R, and a pair of retaining holes 28 are provided between the left and right retaining holes 28 on the upper side of the recess R. A positioning groove 29 extending in the vertical direction is provided at the position.

In the bed structure 1, the legs 30 are attached to the first side wall 21b and the second side wall 22b of the outer frame 20, and the leg 30 on one side and the leg 30 on the other side have a symmetrical structure. It has become.
Since the bed structure 1 has the legs 30, it is possible to attach the bed structure 1 to an upright portion or the like while sufficiently securing the rigidity of the bed structure 1.

In the bed structure 1, the leg portion 30 is in the shape of a vertically long rectangular parallelepiped, and has a convex portion C approximately in the center of the inner surface (the surface on the side of the outer frame portion 20).
A pair of retaining holes 38 are provided on the upper and lower sides of the leg portion 30 of the convex portion C, respectively, and a positioning pin 39 protrudes inward at a position between the left and right retaining holes 38 on the upper side of the convex portion C. is provided.

In the bed structure 1 , the projection C of the leg portion 30 is inserted into the recess R of the outer frame portion 20 , and the positioning pin 39 of the leg portion 30 is inserted into the positioning groove 29 of the outer frame portion 20 .
At this time, since the size of the concave portion R is larger than the size of the convex portion C of the leg portion 30, a horizontal hole is formed in the concave portion R when the convex portion C is inserted.
Then, the insertion key 40 is driven into the lateral hole, and fasteners such as bolts are attached to the fastening holes 38 of the leg section 30 and the fastening holes 28 of the outer frame section 20, so that the leg section 30 is positioned. It is connected to the outer frame portion 20 .
On the other hand, the leg portion 30 and the outer frame portion 20 can be separated by removing the insertion key 40 and removing the fasteners in the retaining holes 28,38.

The leg portion 30 is provided with fastening holes 31 at the front and rear ends of the upper surface thereof.
A tie rod (not shown) passing through the upright portion (not shown) is attached to the tightening hole portion 31 . That is, the bed structure 1 is connected to the crown portion, the upright portion, and the like via tie rods attached to the leg portions 30 .

FIG. 5 is a front view showing one embodiment of the press machine according to the present invention, and FIG. 6 is a side view of the press machine shown in FIG.
As shown in FIGS. 5 and 6, the press machine A according to the present embodiment includes the bed structure 1 described above, an upright portion 4 erected on the bed structure 1, and a crown supported by the upright portion 4. A portion 2, a drive mechanism M arranged on the crown portion 2, a slide portion 3 suspended from the drive mechanism M, a bolster portion 6 installed on the bed structure 1, the crown portion 2, and the upright portion 4. and tie rods 7 that pass through the bed structure 1 in the vertical direction and are tightened with screws so as to sandwich the bed structure 1 from above and below.
A mold 5 is arranged between the slide portion 3 and the bolster portion 6 . Of the molds 5 , the upper mold is connected to the slide portion 3 and the lower mold is fixed to the bolster portion 6 .
The crown portion 2, the slide portion 3, the upright portion 4, the bolster portion 6, and the tie rod 7 can appropriately employ known ones, so detailed description thereof will be omitted.

In the press machine A, a drive mechanism M vertically moves the slide portion to press the workpiece between the dies. The work is carried in and out of the press machine A by a known robot, transfer device, or the like.
Here, as the drive mechanism, a known crank mechanism (see FIG. 5), knuckle mechanism, link mechanism, screw mechanism, friction mechanism, hydraulic mechanism, servo mechanism, etc. can be employed.
Also, the drive mechanism may include a drive source such as a motor or a speed reducer. Note that the motor includes not only a general motor but also a servomotor.

The press machine A is a large machine capable of exerting a press load of 3500 tons or more. Therefore, it is possible to perform stable plastic working even when using new materials such as high-tensile steels and ultra-high-tensile steels in addition to general steel materials as work materials. The material of the work is not limited to these materials, and may be, for example, an aluminum material or FRP (fiber reinforced plastic).
Since the press machine A includes the bed structure 1 described above, it can exhibit sufficient rigidity even against a large press load.

In the press machine A, the bending rigidity of the bed structure 1 when a press load is generated (during pressing) is preferably 2.5×10 ⁻⁴ or less.
When the flexural rigidity exceeds 2.5×10 ⁻⁴ , there is a drawback that metal fatigue is more likely to accumulate than when the flexural rigidity is within the above range.
The bending rigidity is a value (D/L) obtained by dividing the maximum bending amount D (mm) of the upper surface by the width L (mm) (see FIG. 7) to which the press load is applied.
Further, the maximum deflection amount of the upper surface is the maximum value of the distance from the upper surface of the bed structure 1 in a non-flexed state to the upper surface of the bed structure 1 in a bent state, and the width L to which the press load is applied is It is the distance between the two end positions where the bed structure 1 in the flexed state begins to flex, when the bed structure 1 is in the unflexed state.

In the press machine A, the crown portion 2, the drive mechanism M, the slide portion 3, the upright portion 4, and the bolster portion 6 are preferably detachable from each other. That is, it is preferable that these can be divided at their respective boundary portions and can be connected to each other by fasteners such as bolts or tie rods.
In this case, it is possible to divide them and transport them individually.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.

In the bed structure 1 according to this embodiment, the inner frame portion 10 has the first hollow portion 10a penetrating vertically, but the first hollow portion 10a has a lid portion and a bottom portion. may
For example, a detachable lid may be attached to each area partitioned by the partition plate. In this case, there is an advantage that the rigidity of the inner frame portion is further improved.

In the bed structure 1 according to this embodiment, a plurality of partition plates 12 that partition the first hollow portion are attached to the first hollow portion 10a of the inner frame portion 10 at equal intervals so as to be parallel to each other. but not limited to.
For example, the partition plates may be arranged diagonally.
Also, when the plurality of partition plates 12 are parallel to each other, they do not have to be arranged at equal intervals.
Also, the plurality of partition plates 12 may be supported by the left and right wall portions 11 .
Also, the upper and lower ends of the plurality of partition plates 12 are substantially flush with the corresponding upper and lower ends of the four walls 11, but this is not essential.

In the bed structure 1 according to this embodiment, a plurality of first guides 13 are provided on the outer wall surface of the inner frame portion 10. The positions and shapes of the first guides 13 are the positions and shapes shown in FIG. Shape is not limited. The same applies to the plurality of second guides 23 provided on the inner wall surface of the outer frame portion 20 .
Further, although the bed structure 1 has the first guide 13 and the second guide 23, it is not essential, and only one of them may be provided.

In the bed structure 1 according to this embodiment, the front outer frame portion 21 and the rear outer frame portion 22 are arranged in a vertical plane including the center line X passing through the center of the outer frame portion 20 and extending in the left-right direction. On the other hand, they are plane symmetrical to each other, but this is not essential.

In the bed structure 1 according to the present embodiment, the inner wall surface of the front outer frame portion 21 and the inner wall surface of the rear outer frame portion 22 are provided with the support base portions 25 protruding inward. The structure of the portion 25 is not limited to that shown in FIG.
The positioning pin holes 17 and 27 and the bolt holes 16 and 26 are used when the inner frame portion 10 is attached to the support base portion 25. The numbers and positions of these holes are shown in FIGS. are not limited to the numbers and positions shown in .

In the bed structure 1 according to this embodiment, the leg portions 30 on one side and the leg portions 30 on the other side on both sides of the outer frame portion 20 have a symmetrical structure, but this is not essential.

In the bed structure 1 according to this embodiment, the leg portion 30 and the outer frame portion 20 are composed of the convex portion C and the concave portion R, the positioning pin 39 and the positioning groove 29, the fastener and the fastening hole 28, and the insertion key 40. is connected using, but the connection structure is not limited to this.

In the bed structure 1 according to the present embodiment, holes may be provided in the inner frame portion 10, the outer frame portion 20, or the leg portions 30 from the viewpoint of weight reduction as long as the rigidity and the like are not significantly reduced.

The bed structure 1 according to the present embodiment may be used in a single-process press machine, or may be used in a tandem press line press machine.
In addition, it may be one used in a press machine of a transfer press line. In this case, the press machine has a plurality of dies arranged side by side between the slide portion and the bolster portion.

A bed structure according to the present invention can be used as a bed of a press machine.
Also, the press machine according to the present invention can be used as a machine for pressing a workpiece into a desired shape.
ADVANTAGE OF THE INVENTION According to the bed structure of this invention, and a press machine provided with the same, even when press load is enlarged, while having sufficient rigidity, it becomes possible to divide|segment.

Reference Signs List 1 bed structure 10 inner frame portion 10a first hollow portion 11 wall portion 12 partition plate 13 first guide (guide)
Reference numerals 16, 26: bolt holes 17, 27: positioning pin holes 2: crown portion 20: outer frame portion 20a: second hollow portion 21: front outer frame portion 21a. Front wall portion 21b First side wall portion 22 Rear outer frame portion 22a Rear wall portion 22b Second side wall portion 23 Second guide (guide)
Reference Signs List 25: Support base portion 28, 38: Retaining hole 29: Positioning groove 3: Slide portion 30: Leg portion 31: Tightening hole portion 39: Positioning pin 4: Upright portion 40 Insertion key 5 Mold 6 Bolster portion 7 Tie rod A Press machine C Convex portion M Drive mechanism R Concave portion S ···gap

Claims (6)

In bed structures used in press machines,
a hollow quadrangular prism-shaped inner frame portion having a first hollow portion;
a hollow quadrangular prism-shaped outer frame portion having a second hollow portion;
leg portions respectively provided at left and right ends of the outer frame portion;
with
The inner frame portion is arranged in the second hollow portion,
The outer frame portion is divided into a front outer frame portion that is U-shaped in top view and located on the front side of the inner frame portion, and a rear outer frame portion that is U-shaped in top view and located on the rear side of the inner frame portion. It consists of a frame part,
A bed structure in which the inner frame portion, the outer frame portion, and the outer frame portion and the leg portion are detachable from each other. the front outer frame portion has a front wall portion and first side wall portions projecting rearward from both ends of the front wall portion;
the rear outer frame portion has a rear wall portion and second side wall portions projecting forward from both ends of the rear wall portion;
2. The bed structure according to claim 1, wherein a gap is provided between the rear end face portion of said first side wall portion and the front end face portion of said second side wall portion, which face each other. An inner wall surface of the front outer frame portion and an inner wall surface of the rear outer frame portion are each provided with a support base portion protruding inward,
The inner frame portion is detachably attached to the support base portion,
2. The bed structure according to claim 1, wherein the outer wall surface of the main frame, the inner wall surface of the front outer frame portion, and the inner wall surface of the rear outer frame portion are provided with guides that contact each other. . 4. The bed structure according to claim 3, wherein the inner frame portion is detachably attached to the support base portion from the lower surface side of the inner frame portion while being placed on the support base portion. A plurality of partition plates that partition the first hollow portion are attached to the first hollow portion,
2. The bed structure according to claim 1, wherein a plurality of said partition plates are supported by a front wall portion and a rear wall portion of said inner frame portion and are parallel to each other. a bed structure according to any one of claims 1 to 5;
an upright portion erected on the bed structure;
a crown portion supported by the upright portion;
a drive mechanism arranged in the crown;
a slide portion suspended from the drive mechanism;
a bolster portion installed on the bed structure;
a tie rod vertically penetrating through the crown portion, the upright portion, and the bed structure to tighten them;
with
A press machine in which the drive mechanism lifts and lowers the slide portion to press the workpiece between dies arranged between the slide portion and the bolster portion.

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