KR101428192B1 - Apparatus for holding in roll forming blank - Google Patents

Abstract

A roll forming blank holder apparatus according to the present invention comprises: a frame provided on a forming path in which a material is variable roll formed; And a rolling holding means installed on the frame and having a holding roll for rolling and pressing the upper and lower surfaces of the work so as to block a shape error while guiding the work being guided.
As described above, according to the present invention, since the rolling support means having the holding rolls disposed on the upper side and the lower side at intervals corresponding to the thickness of the material is constituted while the guide support of the material is made into a rolling contact type instead of the surface contact type, So that the shape error of the material can be minimized.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a roll forming blank holder device,

The present invention relates to a roll forming blank holder device, and more particularly, to a roll forming blank holder device capable of minimizing a shape error of a material while smoothly advancing a material to be variable roll formed without scratching.

Roll forming (RF) process is a process that can produce very economical products with high dimensional accuracy, scarcely scarcely generated, very little wear on rolls, uniform cross-sectional shape and relatively long length.

Particularly, since it can be molded to ultrahigh strength steel, it has a merit of being suitable for the production of high strength steel automobile parts.

It is widely applied to various kinds of automobile parts. In the case of automobile parts, it can be applied to members (Side, Cross, Roof, Body-cross), Frame (Window, Interior, Structures), Bumper, Impact Carrier .

However, there are limitations in the production of complex cross-sectional shapes required in industry, and it is applied to simple shape forming.

Recently, research on the development of parts forming process for the light weight of automobiles has been going on along with the energy problem. Among them, development of a roll forming process for manufacturing parts of complex shapes designed for light weight is required. Accordingly, a flexible roll forming process for the production of automobile parts having various cross-sectional shapes has been developed.

In the case of conventional roll forming, it was possible to fabricate the beam product gradually without defects and molding errors by using the pure bending process.

However, the variable roll forming process that is currently being developed has a tendency to cause warpage in the web region by continuously receiving stretching and compression in the feed direction of the material in the transitional zone of the material variable cross- Warping) occurs, resulting in a shape error continuously in the transition region of the product.

1 and 2, FIG. 1 is a view showing that a molding material is variable roll formed by a variable molding roll, FIG. 2 is a vertical sectional view of a molding material which is variable roll formed in FIG. 1 FIG.

The first molding material 11, the second molding material 12, and the second molding material 12 are molded by the deformable molding roll 2a while being conveyed to the conveying roll 3, 3 molding material 13, the fourth molding material 14, the fifth molding material 15, and the sixth molding material 16 are gradually formed.

At this time, the first variable area 16a, the second variable area 16b, the third variable area 16c, the fourth variable area 16d, the fifth variable area 16b, The shape error 4 is large in the second, third and fourth variable areas 16b, 16c and 16d and the shape error 4 is remarkable .

As described above, the flexible roll forming (FRF) method differs from the conventional RF forming method in that each of the rolls performs a straight line and a curved movement, which causes unbalance of force in the material, And so on.

Accordingly, in order to guide the progress of the work and prevent the shape deformation, a roll forming blank holder apparatus 20 (see FIG. 3) having plate holding means 21 between the respective forming rolls ).

However, such a roll forming blank holder device 20 has a problem in variable roll forming of the material by utilizing the guide plate material 21a of the plate-like holding means 21. [

More specifically, the guide plate members 21a of the plate-like holding means 21 are disposed on the upper side and the lower side of the forming path of the material, respectively. When the distance between the upper guide plate member 21a and the lower guide plate member 21a is narrowed, The friction between the guide plate members 21a is so severe that scratches are generated on the workpiece surface or the workpiece is caught in the plate-like holding means 21, which interferes with the flow.

On the other hand, if the interval between the upper guide plate member 21a and the lower guide plate member 21a is made wider, a material in which unintended deformation has occurred can not be held properly by the immediately preceding forming roll, resulting in a shape error, Scratches may occur due to the material striking the edge of the roll forming blank holder device or the like.

It is an object of the present invention to provide a roll forming blank holder device having a holding roll for minimizing a shape error of a material while smoothly proceeding without scratches. have.

In order to achieve the above object, a roll forming blank holder apparatus according to a preferred embodiment of the present invention comprises: a frame provided in a forming path where a material is variable roll formed; And a rolling holding means installed on the frame and having a holding roll for rolling and pressing the upper and lower surfaces of the work so as to block a shape error while guiding the work being guided.

At this time, it is preferable that the holding rolls are arranged in the width direction of the material, and a plurality of the holding rolls are arranged along the forming path.

In one embodiment, the holding roll may be movable such that a plurality of the holding rolls are arranged along one side of the blank while the others are arranged along the other side of the blank during molding of the blank having no uniform width .

In another embodiment, the holding roll may be disposed between a plurality of variable shaping rolls arranged along a forming path, or may be disposed between a pair of variable shaping rolls each disposed on both sides in a variable shaping position have.

According to another embodiment of the present invention, the rolling holding means includes a variable holding portion corresponding to a width of the material to be formed and varied, and the variable holding portion is configured such that the two short holding rolls are connected by elastic members to vary the width, And a rolling support member which is in rolling contact with both outer surfaces of the material at both ends can be mounted.

Here, the rolling holding means may further include a reinforcing holding portion for supporting the reinforcing guide between the two variable holding portions arranged one after another, wherein the reinforcing holding portion includes one long holding roll, As shown in FIG.

The rolling holding means described above includes: an upper holder and a lower holder fixed to the frame; And a holding roll rotatably fitted in the upper and lower holders, respectively.

The roll forming blank holder apparatus according to the present invention comprises the rolling holding means having the holding rolls arranged on the upper side and the lower side at intervals corresponding to the thickness of the material, , The material to be variable roll formed is smoothly progressed without scratches, so that the shape error of the material can be minimized.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing that a molding material is variably roll-formed by a variable shaping roll;
Fig. 2 is a vertical cross-sectional view of the molding material which is variable roll formed in Fig.
3 shows a roll forming blank holder apparatus according to the prior art.
4 is a view showing a roll forming blank holder apparatus according to a preferred embodiment of the present invention.
Fig. 5 is an enlarged view showing a rolling hold means in the roll forming blank holder apparatus of Fig. 4;
FIG. 6 is a diagram showing the upper holder in an inverted state in the rolling hold means of FIG. 5;
Fig. 7 is a view showing a lower holder in the rolling hold means of Fig. 5;
8 is a conceptual view showing a holding roll in a roll forming blank holder apparatus according to another preferred embodiment of the present invention.
9 is a conceptual view showing a holding roll in a roll forming blank holder apparatus according to another preferred embodiment of the present invention.
Fig. 10 (a) is a simulation view showing a workpiece formed while being supported by a roll forming blank holder apparatus according to the related art, Fig. 10 (b) Fig.

The roll forming blank holder device of the present invention is a roll forming method in which a material to be variable roll formed smoothly progresses without scratches so that the shape error of the material can be minimized while the guide support of the material is made into a rolling contact manner, And a holding roll which has a gap on the lower side as much as the thickness of the material.

Hereinafter, the present invention will be described in detail with reference to the drawings.

Fig. 4 is a view showing a roll forming blank holder apparatus according to a preferred embodiment of the present invention, and Fig. 5 is an enlarged view showing a rolling holding means in the roll forming blank holder apparatus of Fig.

FIG. 6 is a view showing the upper holder turned upside down in the rolling hold means of FIG. 5, and FIG. 7 is a view showing the lower holder in the rolling hold means of FIG.

Referring to the drawings, the present invention includes a frame 110 provided in a molding path of a material and a rolling holding means 120 installed in the frame 110.

The frame 110 is placed in a molding path in which the material is variable roll formed, and has a structure that is not interfered with each variable forming roll (not shown) placed apart along the molding path.

In addition, the frame 110 may have a structure in which the rolling and holding means 120 can be firmly and stably fixed on a molding path of a predetermined height.

Further, the rolling holding means 120 is installed on the frame 110, but is configured to block the shape error while guiding the material being guided.

More specifically, the rolling holding means 120 includes an upper holder 141 and a lower holder 142 fixed to the frame 110, and a holding roll 142, which is rotatably fitted to the upper holder 141 and the lower holder 142, (Not shown).

The upper and lower holders 141 and 142 are formed with roll grooves 141a and 142a in which the holding rolls 160 are inserted and rotated. A plurality of the roll grooves 141a and 142a may be formed in the longitudinal direction of the upper holder 141 and the lower holder 142 so as to be disposed in the lower holder 142 and the lower holder 142, respectively.

The upper holder 141 and the lower holder 142 may be provided with friction reducing grooves 141b and 142b extending in the longitudinal direction to reduce rotational friction between the upper holder 141 and the lower holder 142. [ At this time, the friction reduction grooves 141b and 142b may be spaced apart from each other in the width direction of the upper holder 141 and the lower holder 142, respectively.

The upper holder 141 may be connected to one side of the frame 110 located on the upper side with a bracket 130.

Meanwhile, the holding rolls 160 may be arranged in the width direction of the material, and a plurality of the holding rolls 160 may be arranged along the forming path. And may be rotatably fitted in the plurality of roll grooves 141a and 142a in the holder 142. [

At this time, the both ends of each of the holding rolls 160 may be coupled to the upper holder and the lower holder to be rotated by the rotary bearings 170, respectively.

The holding roll 160 having such a configuration serves to roll the upper and lower surfaces of the material to be variable roll formed by rolling to block the shape error while supporting the material.

Specifically, when the upper and lower surfaces of the material on which the rolling and holding means 120 is guided are guided, the proceeding material is brought into surface contact with the guide plate in the existing plate-type holding means. And can be guided while being in rolling contact.

Since the guide support of the material by the holding roll 160 is made by rolling contact, the quality of the formed product can be improved and the flow of the material can be smoothly performed.

Further, the guide support by the rolling contact can minimize the gap between the upper holding roll 160 and the lower holding roll 160, thereby minimizing the shape error of the workpiece.

In the structure in which the holding roll 160 is disposed in the forming path of the material, various improved embodiments will be described.

8 is a conceptual view showing a holding roll in a roll forming blank holder apparatus according to another preferred embodiment of the present invention. Here, the material 200 proceeds to the left and gradually becomes larger in width. Arrows in the drawing indicate the relative movement of the holding roll 160 with respect to the moving material 200.

Referring to the drawings, the holding roll 160 may be formed by arranging a plurality of the holding rolls 160 along one side of the blank 200 when forming the blank 200 having a non-uniform width, And can be arranged so as to be arranged along the other side.

That is, in the case where the width of the material 200 to be variable roll formed is not constant, in order to stably support the entire width of the width of the material 200, A part of the material 160 may be disposed along one side of the material 200 and the rest may be disposed along the other side of the material 200.

In other words, as shown in Fig. 8, for example, six holding rolls 160 are arranged in spaced relation to each other to be disposed between a plurality of forming rolls along a forming path, wherein six holding rolls 160 Of the work 200 may be shifted to form an arrangement structure that is offset along one side of the work 200 in the width direction of the work 200 and the remaining three may be shifted to form an arrangement structure biased along the other side of the work 200 .

In addition, the holding roll 160 may be turned while moving toward the side of the work 200.

As shown in the drawing, for example, three holding rolls 160 may be one set or a larger number may be one set. When a plurality of the holding rolls 160 move to the side of the work 200 as a set A part where the holding roll 160 can not support the guide is formed at one side where the width of the material 200 is increased while being inclined.

To compensate for this, in order to support the portion of the material 200 having a larger width as a whole by the holding roll 160, the plurality of holding rolls 160 are configured to be movable as well as movable as a set .

The movement and direction of the holding roll 160 may be realized by driving means (not shown) such as a cylinder, a motor, etc., associated with the holding roll 160, although not shown in the drawings.

The upper holder 141 and the lower holder 142 on which the holding rolls 160 are mounted are provided with moving lines and rotating lines of the holding rolls 160 for moving and turning directions of the holding rolls 160. [ A guide structure such as a guide rail (not shown) is formed, so that the movement and rotation of the holding roll 160 can be performed smoothly and stably.

Further, although not shown in the figure, the holding rolls are disposed between a plurality of variable forming rolls (not shown) arranged along the forming path, or a pair of And can be disposed between the variable shaping rolls.

That is, the holding rolls can be respectively disposed between the variable forming rolls disposed basically apart from each other in the forming path, and the material can be guided and supported without being interfered with the variable shaping roll at the position where the variable shaping roll is disposed And can be disposed between a pair of variable-form rolls disposed on both sides of the material.

Accordingly, the upper and lower surfaces of the material are rolled and pressed not only between the plurality of variable-shaping rolls but also at the positions where the variable-shaping rolls are formed, thereby guiding the material while guiding the material, thereby preventing the shape errors.

9 is a conceptual view showing a holding roll in a roll forming blank holder device according to another preferred embodiment of the present invention.

Referring to FIG. 9A, the rolling holding means 120 may include a variable holding portion 151 corresponding to a width of the material 200 to be formed and varied.

The variable holding part 151 may be configured such that two short holding rolls 161 are connected by an elastic member 163 to vary the width.

That is, the variable holding portion 151 has a structure in which the width of the variable holding portion 151 is variable corresponding to the width of the work 200. For example, two short holding rolls 161, And can be disposed in the width direction of the work 200. At this time, the elastic member 163 may be a spring.

For example, when the width of the elastic member 163 is relatively small in the work to the left, the elastic member 163 maintains the compressed state. When the width of the elastic member 163 is variable, So that the two short-type holding rolls 161 are moved in the direction of increasing width of the work 200.

The rolling support member 180 may be installed at both ends of the variable holding part 151 so that the rolling support member 180 may be configured to be in rolling contact with both outer surfaces of the material 200. At this time, any conventional rotatable support member such as a ball, a bearing, or the like can be utilized to guide the progress of the material while pressing and rotating the moving material while the position of the rolling support member 180 is fixed.

The rolling support member 180 fixed to the opposite ends of the variable holding portion 151 as described above makes the progress of the work 200 smooth while rolling contact with the inner side surfaces of both sides of the progressed work 200, The width of the variable holding portion 151 is increased in association with the increase in width.

On the contrary, when the width of the material 200 is reduced again, the elastic member 163 is compressed and the width of the variable holding portion 151 is correspondingly reduced.

9 (b), the rolling holding means 120 includes a reinforcing holding portion 152 for supporting the material 200 between the two variable holding portions 151 arranged one after another .

The reinforcing holding part 152 is disposed between two elastic members 163, that is, disposed between the two variable holding parts 151 arranged in series, and the variable holding part 152 151) of the respective elastic members (163).

This is because the portion of the elastic member 163 in the variable holding portion 151 can not support the material 200 so that the elastic member 163 of the variable holding portion 151 The reinforcing holding portion 152 is disposed to guide and support the work 200.

At this time, it is preferable that the reinforcing holding part 152 is formed as an elongated holding roll 162 which is longer than the length of the elastic member 163 extending from the variable holding part 151.

10 (a) is a simulation view showing a workpiece formed while being supported by a roll forming blank holder apparatus according to the related art, and Fig. 10 (b) Fig.

Referring to the drawings, when a conventional roll forming blank holder device is used in the variable roll forming, a shape error 200a occurs in the blank 200 as shown in FIG.

However, in the case where the roll forming blank holder apparatus 100 according to the above-described embodiments of the present invention is utilized, the upper holding roll and the lower holding roll smoothly flow the material as the roll supports the guide while rolling The upper holding roll and the lower holding roll are spaced apart from each other by an appropriate distance corresponding to the thickness of the workpiece, thereby firmly holding the workpiece to be molded, thereby preventing the workpiece 200 from generating a shape error as shown in FIG. 10B .

According to the present invention constituted as described above, the rolling holding means having the holding rolls arranged on the upper side and the lower side at intervals corresponding to the thickness of the material is constituted while the guide support of the material is made into a rolling contact manner instead of the surface contact type, As the material to be roll formed progresses smoothly without scratching, the shape error of the material can be minimized.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

100: roll forming blank holder device 110: frame
120: Rolling and holding means 130: Bracket
141: upper holder 142: lower holder
141a, 142a: Roll groove 141b, 142b: Friction reducing groove
151: variable holding part 152: reinforcing holding part
160: Holding roll 161: Short holding roll
162: long holding roll 163: elastic member
170: Rotary bearing 180: Rolling support member
200: Material 200a: Geometric error

Claims (7)

A frame (110) provided in a molding path in which the material (200) is variable roll formed; A rolling holding means 120 installed on the frame 110 and having a holding roll 160 for rolling the upper and lower surfaces of the work 200 to prevent a shape error while guiding the work 200 being advanced, ≪ / RTI >
The holding rolls 160 are arranged in the width direction of the material 200, and a plurality of the holding rolls 160 are arranged along a forming path,
The rolling holding means 120 is provided with a variable holding portion 151 corresponding to the width of the material 200 which is formed and varied and the variable holding portion 151 is formed by two short- And a rolling support member (180) that is in rolling contact with both outer surfaces of the material (200) is mounted on both ends of the roll forming blank holder device (100).
delete The method according to claim 1,
The holding roll 160 may be a roll-
A plurality of the plurality of pieces are arranged along one side of the material 200 while the others are arranged along the other side of the material 200 when the material 200 having a non- (100).
The method according to claim 1,
The holding roll 160 may be a roll-
(200) is disposed between a plurality of variable-form rolls arranged along a forming path, or the material (200) is disposed between a pair of variable-forming rolls disposed on both sides in a variable-forming position 100).
delete The method according to claim 1,
The rolling holding means 120 further includes a reinforcing holding portion 152 for supporting the material 200 between the two variable holding portions 151 arranged one after another,
Wherein the reinforcing holding part (152) is arranged such that one elongated holding roll is disposed between the two elastic members (163).
The method according to any one of claims 1, 3, 4, and 6,
The rolling holding means (120)
An upper holder 141 and a lower holder 142 fixed to the frame 110; And
The holding roll 160 rotatably fitted in the upper and lower holders 141 and 142, respectively;
(100). ≪ / RTI >

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