JPH08117874A - Mechanism for supporting upper roll in roll-bending apparatus - Google Patents

Abstract

PURPOSE: To improve the bending precision by engaging the engaging part of a side frame and the part to be engaged of an auxiliary arm in the condition of rotatably supporting an upper roll and preventing the deflection of the auxiliary arm in the front and rear direction. CONSTITUTION: In the supporting posture for rotatably supporting the upper roll 1 by fitting the bearing part 121 of the auxiliary arm 12 to the tip end part of the upper roll 1, the engaging part 71 arranged at the side frame 61 and the part 72 to be engaged arranged at the auxiliary arm 12 are engaged at the upper part of a shaft supporting part 122. The relation between the engaging part 71 and the part to be engaged is constituted with the projecting streak extended to the vertical direction and the recessed groove closely fitted with the projecting streak or has the construction mutually continuing the projecting streaks and the recessed grooves having V-shaped cross section. In such a way, since the auxiliary arm for supporting the upper roll 1 is difficult to deflect before and after the bending work, the rotation of the upper roll 1 is smoothened and the bending precision can be held.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll bending device, and more particularly to a roll supporting mechanism therefor.

[0002]

2. Description of the Related Art A roll bending device consisting of only an upper roll and a lower roll having a urethane layer formed on the outer surface thereof, a metal three-roll type roll bending device, and a lower roll below the upper roll. A four-roll type roll bending device provided with a pair of side rolls on both sides is used as a roll bending device for bending a metal plate into an arc shape or a cylindrical shape.

Among the roll bending devices of this type, a device having a long roll length (for example, about 1 m or more) is usually used.
The lower roll (2) is supported by a side frame, and the tip of the upper roll (1) is supported by an auxiliary arm (12) extending from a side frame (61) connecting both front and rear sides of the frame. The tip portion of the upper roll (1) is fitted in the bearing portion (121) of the auxiliary arm (12). And a metal plate (hereinafter,
To take out the product after bending the work (W)),
The upper roll (1) can be rotated to a position where the space between the tip of the upper roll (1) and the side frame is opened. (See FIG. 1) Therefore, the auxiliary arm (12) is pivotally supported by the shaft support (122) provided on the outer surface of the side frame (61), and the rotation direction thereof is the side frame (61). Is set at right angles to the outer surface of. Therefore, the auxiliary arm (12) does not move in the direction along the outer surface of the side frame (hereinafter referred to as the front-back direction).

However, the supporting posture of the auxiliary arm (12) in the front-rear direction is determined by the shaft support (12) provided on the side frame.
Since it is only held by 2), in the case of a roll bending device that is large and has a long upper roll (1), the rigidity (holding force) for holding the above-mentioned supporting posture in the front-back direction is insufficient. During bending, the upper roll (1) bends back and forth.

This bending is caused by the bending accuracy and the upper roll.
It affects the smoothness of rotation of (1). The present invention has been made in view of the above point, and it is described that "a work (W) is clamped between an upper roll (1) and a lower roll (2) supported in a bridge shape by side frames at both ends of the frame. This work
A device for bending (W) in an arc shape or a cylindrical shape, wherein the auxiliary roll (12) rotatably supporting the tip of the upper roll (1) is rotated downward to rotate the upper roll (1). ) Of the roll bending device which opens the space between the tip of the upper arm and the lower side frame of the upper arm, and prevents the auxiliary arm (12) from bending in the front-rear direction to ensure smooth operation and bending accuracy of the upper roll. The task is to ensure that.

[0006]

[Technical Means] A technical means of the present invention for solving the above-mentioned problem is that the "auxiliary arm (12) has a cylindrical bearing portion (a bearing end) of a free end centered on a shaft support portion (122) of a side frame. 121) is a support posture in which it is fitted onto the tip of the upper roll (1) and the bearing
(121) is provided so as to be capable of reciprocating rotation between the front end of the upper roll (1) and an open posture that is separated obliquely downwardly, and is provided on the outer surface of the side frame of the shaft support (122) of the auxiliary arm (12). An engaging portion (71) is provided on the upper side so as to face the auxiliary arm (12), and an engaged portion is provided on the auxiliary arm (12) at a portion facing the engaging portion (71).
(72) is provided, the engaged portion (72) is engaged with the engaging portion (71) of the side frame in the supporting posture of the auxiliary arm (12), and the engagement relationship is The engaged portion (72) has a relationship of preventing movement in the direction along the side frame. (See Figure 3)

[0007]

[Function] With the above technical means, the auxiliary arm (1
The bearing part (121) of 2) is fitted to the tip of the upper roll (1),
In the supporting posture in which the upper roll is rotatably supported, the engaging portion (71) of the side frame (61) and the engaged portion of the auxiliary arm (12) are
(72) engages above the shaft support (122), and the side frame (6
Movement in the direction along the outer surface of 1) (front-back direction) is blocked.

Therefore, even if the upper roll (1) is long and large, the bending of the auxiliary arm (12) during bending is prevented by the engagement.

[0009]

[Effect] Since the auxiliary arm (12) supporting the upper roll (1) is not easily bent back and forth during bending, the front and rear shifts of the support positions of the both end support portions of the upper roll do not occur. Therefore, the upper roll
The rotation of (1) is smooth. Further, since the rotational position of the upper roll (1) during bending is maintained at a fixed position, the accuracy of bending is improved.

[Other inventions] The invention defined in claim 2 makes it possible to obtain the effect of the invention of claim 1 even in the case of a roll bending apparatus of the type for raising and lowering the upper roll (1). The means adopted for this purpose is the engagement part (7
The engagement relationship between 1) and the engaged portion (72) is such that it is relatively movable in the vertical direction ”.

With this structure, even when the supporting position of the upper roll with respect to the lower roll is adjusted and the axially supporting position of the auxiliary arm (12) is adjusted accordingly, the engaging portion (71) in claim 1 The above engagement between the engaged portion (72) and the engaged portion (72) is ensured. Therefore, the effect of the above-mentioned claim 1 is similarly secured.

[0012]

Embodiments of the present invention described above will now be described in detail with reference to the drawings. The embodiment shown in FIGS. 2 to 10 is an upper roll (1) having a drum-shaped body and a lower roll provided below the upper roll (1).
(2) and a pair of side rolls on the sides of the lower roll (2)
(4) The present invention is applied to a four-roll type roll bending device provided with (4). Also, in this device, the lower roll
The support position of (2) is fixed, and the distance between it and the upper roll (1) is adjusted by raising and lowering the upper roll (1), and the side rolls (4) and (4) are fixed fulcrums. The configuration is such that it reciprocally rotates in a certain range around.

Each section will be described in detail below. [Support structure for upper roll (1) and lower roll (2)] Lower roll
As shown in FIGS. 2 and 3, both ends of (2) are rotatably supported by upper portions of side frames (61) and (61) provided at both left and right ends of the frame of the roll bending apparatus. This lower roll
The upper roll (1) is supported so that it can be raised and lowered with respect to (2).

For this reason, the side frames (61) (61) have a built-in support body (60) whose height can be adjusted, and a main arm (11) swingably mounted above the support body (60). Both ends of the upper roll (1) are supported by the auxiliary arm (12). One main arm (11) is connected and fixed to the end of the upper roll (1),
The other auxiliary arm (12) can be opened and closed with respect to the tip of the upper roll (1). For this reason, at the tip of the auxiliary arm (12), there is a cylindrical bearing (121) that fits into the tip of the upper roll (1). It is configured to be reciprocally rotated. Therefore,
When the auxiliary arm (12) is rotated to the upright posture, the bearing (12
When (1) is fitted onto the tip of the upper roll (1) and rotatably supported, and then falls outward, the bearing (121) comes off the tip of the upper roll (1) and the upper roll (1) And left side frame (61)
The space between and is opened.

On the upper part of the main arm (11), as shown in FIGS.
A rotating shaft (14) provided with a disc-shaped eccentric shaft (13), and the eccentric shaft
A bearing mechanism (15) fitted to (13) and a drive mechanism (16) for rotationally driving the rotating shaft (14) are provided with a cam mechanism, and the bearing ring (15) (15) is provided. The side frame (61) is in contact with a rail (17) provided on the outer surface of the accommodating portion of the main arm (11) in a rollable manner. Therefore, when the rotating shaft (14) is rotationally driven by the drive device (16), the main arm is driven by this cam mechanism.
(11) is reciprocally rotated within a certain range.

Therefore, when the main arm (11) is tilted outward from the upright posture by the rotation while the auxiliary arm (12) is in the open state as described above, the upper roll is rolled as shown by the broken line in FIG.
The tip of (1) is lifted upward, and the space between it and the lower roll (2) is opened. In order to make the support body (60) movable up and down with respect to the side frame (61), a rectangular opening (612) is formed in the lower central portion of the side frame (61) as shown in FIG. The support (60) consisting of a block is accommodated,
The side part thereof is fitted in the side part of the opening so as to be vertically movable.

Further, the height of the support (60) is set to the screw mechanism (6
30). For this,
As shown in FIG. 7, a screw shaft (63), which is upright and rotatable from the lower end of the side frame (61), is screwed onto the support (60). Then, the screw shafts (63) (6
3) The components are transmitted to each other via a common first drive shaft (64) and bevel gear mechanism. Therefore, the supports 60, 60 move up and down in synchronization with the rotation of the first drive shaft 64. [About the auxiliary arm (12)] On the lower part of the left support (60),
As shown in FIGS. 6 and 7, a hydraulic cylinder (62) is swingably attached, and its output shaft is connected near the fulcrum of the auxiliary arm (12). Therefore, when this hydraulic cylinder (62) is operated to advance its output shaft, the auxiliary arm (12) stands upright, and when the output shaft is retracted from this state, the auxiliary arm (12)
Will fall to the outside.

The auxiliary arm (12) includes a pair of side plates (123) (123).
Install the bearing (121) between the upper ends of the
A bearing cylinder serving as (122) is provided, and the shaft portion provided in the support body (60) penetrates through the bearing cylinder. In this embodiment, the shaft support (122) is located at the center of the cross section of the support (60).
Also, in the middle of the pair of side plates (123) (123), the side frame
An engaged portion (72) is provided in a portion facing the (61), and an engaging portion (71) is provided in a portion of the outer surface of the side frame (61) facing the engaged portion (72). . As shown in FIG. 8, the opposing end surfaces of the engaging portion (71) and the engaged portion (72) have a surface shape in which convex stripes and concave grooves having a V-shaped cross section are alternately provided. The ridge and the groove are vertically extended.

The bearing portion (122) has the upper roll (1).
In the supporting posture of the auxiliary arm (12) fitted to the above, the convex line and the concave groove of the engaging part (71) and the engaged part (72) are closely fitted to each other. Therefore, the lower end of the auxiliary arm (12) is
The movement of the side frame (1) in the direction along the outer surface (front-rear direction) is prevented by 1), and the engagement of the protrusion and the groove also causes the auxiliary arm (12) to move in the front-back direction. Movement is blocked. As a result, the rigidity of the auxiliary arm (12) in the front-rear direction in the supporting posture is improved.

[Regarding Side Roll (4)] The side roll (4) is provided on the side of the lower roll (2) so that it can be contacted and separated from the upper roll (1) obliquely from below. Therefore, both ends of the side roll (4) are swingably supported by the support arms (65) provided in the side frame (61) as shown in FIGS. The support arm (65) has a fulcrum that is laterally downward of the lower roll (2) in the side frame (61), and a peripheral edge of the support arm (65) serves as a gear portion (66).

A gear (671) transmitted to the second drive shaft (67) meshes with the gear portion (66). Therefore, the rotation of the second drive shaft (67) causes the support arms (65) (65) that support both ends of each side roll (4) to swing synchronously,
Swing in the direction of the arc. In the middle of the side roll (4),
As shown in FIGS. 2 and 9, a pair of backup rolls (41) and (41) are in contact with each other from below. This backup roll (4
1) and (41) are rotatably supported by a pair of arms (42) and (42), and the arms (42) and (42) are coaxial with the fulcrum of the supporting arm (65) and a pair of central first frames. It is swingably supported by a fulcrum shaft (69) installed between the plates (68) (68). A gear portion (43) is provided at the tip of the arm (42), and a gear (673) provided on the second drive shaft (67) is meshed with the gear portion (43). These become the support mechanism (400). Therefore, the arm (42) of the support mechanism (400) is reciprocally rotated by the same angle synchronously with the support arm (65), and the side roll (4) contacts the upper roll (1). Even if the side rolls (4) are rotated so as to be separated from each other, the middle part of the side rolls (4) is always supported so as to be in contact with the backup rolls (41) (41).

[Lower Roll (2)] Lower Roll (2)
As described above, both ends are rotatably supported by the side frames (61) (61). In addition, as shown in FIG. 2, FIG. 3, and FIG.
It is supported from below by the supporting devices (3) and (3) provided between the (68) and the second frame plate (31) provided on the outside thereof.

The support device (3) comprises a pair of support rolls (32) (32) provided at the upper end, a bearing stand (33) for rotatably supporting these, and a lifting drive for the bearing stand (33). The bearing base (33) is engaged with both sides of the second frame plate (31) and each frame plate (68) in a vertically movable relationship. The lifting device, a pair of lifting shafts (36) (36) protruding downward from the bearing base (33),
An eccentric cam part (34) arranged to be in contact with a roller (361) provided at the lower end of the lifting shaft, and a third eccentric cam part provided with the eccentric cam part.
It consists of a drive shaft (35). The third drive shaft (35) transmits to the lifting mechanism of both supporting devices (3) and (3).

The third drive shaft (35) is a hydraulic motor (3
While being driven to rotate by 7), the ascending dimension from the bottom dead center position of the lifting shaft (36) is measured by the distance meter (38),
A control device (39) is provided for controlling the operating angle of the hydraulic motor (37) according to the measured value and the set value input from the central supporting force setting device (391). Therefore, when the set value of the ascending stroke of the supporting device (3) is input and the hydraulic motor (37) is operated, the control device (39) controls the operation amount of the hydraulic motor (37), and the rangefinder ( When the measured value by 38) reaches the set value, the drive pressure of the hydraulic motor (37) is maintained in that state, the rotation of the third drive shaft (35) is stopped, and the position of the support rolls (32) (32) is stopped. Is fixed. As a result, the central portion of the lower roll (2) is maintained in a state of being bent upward.

[Actual Roll Bending] The bending process is the same as that of the conventional four-roll type roll bending apparatus. In order to put the work (W) between the upper roll (1) and the lower roll (2), first, the auxiliary arm (12) is supported by the bearing (121) of the upper roll.
As the support posture fitted to the tip of (1), the hydraulic motor (6
40) drives the first drive shaft (64) to elevate and lower the support body (60) to which the main arm (11) and the auxiliary arm (12) are attached, and the upper roll (1) and the lower roll (2) Set the interval to the appropriate value according to the bending conditions.

After this, the tip of the work (W) is placed on the upper roll (1).
Clamped between the lower roll (2) and the lower roll (2), bring the side roll (4) on the front side of the lower roll (2) close to the upper roll (1) side according to the bending curvature, Make a bend. Next, when the upper roll (1) is rotationally driven in the above state, the front end side of the work (W) is bent to the set curvature. Then, before the tip of the bent work (W) reaches the rear side roll (4), the rear side roll (4)
Move (4) closer to the upper roll (1) side. Then, after the tip of the work (W) reaches the rear side roll (4), the work is performed by the upper roll (1) and the lower roll (2).
(W) is clamped, and the bending process proceeds in such a manner that the front and rear of the rotation direction are in contact with the pair of side rolls (4) and (4).

At the time of the end bending, and side rolls
(4) When bending using (4), the bending force in the front-back direction acts on the upper roll (1), and the bending caused by it is the main roll.
Although the maximum is at the tip of (1), the lower end of the auxiliary arm (12) supporting this tip is the shaft support (122), and the middle is the engaging part (71). Since the movement in the front-rear direction is blocked by the engagement between the engaged portion (72) and the engaged portion (72), the bending is prevented by the auxiliary arm (12) supported by these two points.

In particular, in this embodiment, the lower roll (2) has a cylindrical shape, but the upper roll (1) is formed in a drum shape, and the output value from the central supporting force setting device (391) is set. By doing so, the supporting pressure from the supporting device (3) in the central part of the lower roll (2) is set according to the plate thickness and bending curvature of the work (W), and the central part of the lower roll (2) has an appropriate degree. Can be bent upward.

As a result, the upper roll (1) and the lower roll (2)
The bending of the central part of can be corrected, and the clamping pressure of the work (W) by the upper roll (1) and the lower roll (2) during bending becomes constant in the width direction. Therefore, work (W)
In case of thick plate thickness or large bending curvature, bending due to insufficient rigidity of the upper roll (1) and the lower roll (2) can be prevented, so the bending precision under such conditions is also improved. Therefore, the durability of the bearing portions of the upper roll and the lower roll is improved.

If the tip of the work (W) can be bent at the beginning of bending, and the rear end of the work (W) is aligned between the upper roll (1) and the lower roll (2). Stop the rotation of the upper roll (1), separate the front side roll (4) from the upper roll (1), and remove the rear side roll.
It is possible to bend the rear end of the work (W) by bringing (4) close to the upper roll (1) side. Therefore, in this embodiment, both ends of the work (W) can be bent. Incidentally, during this end bending, particularly large deflection occurs in the central portion of the side rolls (4) (4), but in this embodiment, the backup rolls (41) (41) that are in contact with the side rolls (4). Since it is supported by the pair of arms (42) and (42) provided with, the bending is prevented and the end bending accuracy is improved.

Although the above embodiment has been described by taking the four rolls as an example, the present invention can also be used as an upper roll supporting mechanism for two rolls or three rolls. Also, the engaging portion (71) and the engaged portion
The relationship with (72) is an engagement relationship in which relative movement in the direction along the outer surface of the side frame (61) is prevented, and the rotation toward the outside in the direction perpendicular to the side frame (61). Other engagement relationships can be used as long as the engagement relationships are disengaged by movement. For example, as shown in FIG. 11, a pair of side plates of the auxiliary arm (12)
The inner edges of (123) and (123) may be individually fitted into engaging recesses (611) and (611) provided on the outer surface of the side frame (61).

Further, in the above embodiment, the engaging portion (71) is provided directly on the side frame (61), but the engaging portion (71) may be provided on the support body (60).

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a conventional example.

FIG. 2 is a front view of the entire embodiment of the present invention.

FIG. 3 is a plan view thereof

FIG. 4 is a plan view of the main arm (11)

[Fig. 5] Operation explanatory diagram of the main arm (11)

FIG. 6 is a side view of the side frame (61).

FIG. 7 is an explanatory view of the lifting mechanism of the support body (60) and the auxiliary arm (12).

FIG. 8 is a sectional view of the main part.

FIG. 9 is an explanatory view of a central support mechanism of the side roll (4).

FIG. 10 is a front view of a supporting device (3) and a backup roll unit.

FIG. 11 is an explanatory view of another example of the engaging portion (71) and the engaged portion (72).

[Explanation of symbols]

 (1) ・ ・ ・ Upper roll (2) ・ ・ ・ Lower roll (W) ・ ・ ・ Workpiece (12) ・ ・ ・ Auxiliary arm (122) ・ ・ ・ Shaft support (121) ・ ・ ・ Bearing part (71)・ ・ ・ Engagement part (72) ・ ・ ・ Engagement part (61) ・ ・ ・ Side frame (11) ・ ・ ・ Main arm (610) ・ ・ ・ Arm frame

Claims (5)

[Claims] 1. A work (W) is clamped between an upper roll (1) and a lower roll (2) which are supported by side frames at both ends of the frame in a bridge shape, and the work (W) is arc-shaped. Alternatively, it is a device for bending into a cylindrical shape, and the auxiliary arm (12) for rotatably supporting the tip end portion of the upper roll (1) is rotated downward and the tip end portion of the upper roll (1) In the roll bending device configured to open between the lower side frame and the lower side frame, the auxiliary arm (12) includes the shaft support (1
22) as a center, the cylindrical bearing part (121) at the free end is fitted onto the tip of the upper roll (1) and the bearing position (12)
1) is provided so as to be reciprocally rotatable between the front end of the upper roll (1) and an open posture that is obliquely downwardly separated, and is located above the shaft support (122) of the auxiliary arm (12) on the outer surface of the side frame. To the auxiliary arm
An engaging portion (71) is provided so as to face the (12), and an engaged portion (7) is provided at a portion of the auxiliary arm (12) facing the engaging portion (71).
2) is provided, the engaged portion (72) is engaged with the engaging portion (71) of the side frame in the supporting posture of the auxiliary arm (12), and the engagement relationship is the above-mentioned. An upper roll support mechanism for a roll bending device in which the engaged portion (72) is prevented from moving in the direction along the side frame. 2. The upper roll support mechanism of the roll bending apparatus according to claim 1, wherein the engagement relationship between the engaging portion (71) and the engaged portion (72) is such that the engaging portion (71) and the engaged portion (72) are relatively movable in the vertical direction. . 3. The relationship between the engaging portion (71) and the engaged portion (72) is a ridge extending in the vertical direction and a concave groove closely fitted to the ridge.
The upper roll support mechanism of the roll bending apparatus according to claim 1 or 2. 4. The engaging portion (71) and the engaged portion (72) are configured such that convex stripes and concave grooves having a V-shaped cross section are alternately continuous.
The upper roll support mechanism of the roll bending apparatus according to [1]. 5. The base end side of the upper roll (1) is rotated by the main arm (11) pivotally supported by the lower side frame (61) into a horizontal posture and a posture inclined upward toward the tip. A pair of arm frames (610) (610) are provided on the upper part of the side frame (61) so as to be movable, and these arm frames are supported.
The upper roll support mechanism according to any one of claims 1 to 4, wherein the upper part of the main arm (11) is slidably inserted between (610) and (610).