KR100206022B1 - Deformation device of bumper beam for automobile - Google Patents

Abstract

It is an object of the present invention to provide a bumper beam forming apparatus for a vehicle capable of forming a sheet-like steel sheet material into a tube shape having a predetermined shape by gradually forming a small amount of bending through roll forming; Roll forming means for arranging a plurality of roll formers sequentially to roll-form a strip-shaped steel sheet into a predetermined tube shape; First sweep forming means for gently bending the material formed by the roll forming means; A second sweep forming means for secondarily bending the material curved by the first sweep forming means according to a required curvature; Shape adjusting means for adjusting the material curved by the second sweep forming means to have a final shape as a bumper beam; It provides a bumper molding apparatus for a vehicle comprising a.

Description

Bumper Beam Forming Equipment for Vehicles

The present invention relates to an apparatus for forming a bumper beam for a vehicle, which enables a bumper beam to be manufactured in one step by roll forming.

For example, the bumper is a shock absorbing member which is disposed at predetermined positions at the front and rear ends of the vehicle to absorb the impact energy during a collision and a collision accident, thereby minimizing damage to the vehicle body and human damage.

The bumper includes a bumper beam disposed in the vehicle width direction and fixed to the vehicle body by stays at both rear portions, a shock absorbing member disposed on the front of the beam, and a bumper cover disposed on the front of the shock absorbing member to protect them. .

In such a bumper, the present invention relates to a bumper beam, and in forming the bumper beam thereof, conventionally, two chambers having openings formed at one side as viewed in cross section are formed in a W-shape in which a certain plane is faced to each other. It is common to form a tube shape by welding a plate made on the main body and the opening side.

However, in forming the bumper beam as described above, by forming the main body in a separate process and then welding the strip-shaped plate, there is a problem that increases the manufacturing cost by increasing the number of press work and the assembly work according to the assembly of a large number of parts. have.

In addition, when a large number of panels are formed by pressing, a large amount of scrap, which is a problem in press forming, is a factor of waste of raw materials, which implies that the economy is poor.

In addition, in the weight plane, in order to bond the plate to the main body, an edge portion capable of being interviewed with the plate must be formed in the main body, and thus an increase in weight may cause an adverse effect on the weight reduction of the vehicle.

Accordingly, in recent years, a bumper beam having one strip-shaped steel sheet in the form of a tube having a predetermined shape by roll molding has been proposed and actually used.

As a molding apparatus for forming a bumper beam made of one material as described above, US Patent No. 5,104,026 is known.

When the steel sheet is passed through a plurality of roll formers, the shape of the plate is gradually changed into a tube shape through each roll former, and the tube bottom is molded into an irregular surface while passing through the support member, thereby forming a single tube. .

And the tube is welded to the joint by the welding machine, and then supplied to the sweeping means, it gives a curvature to the straight tube and the tube thus completed is to be completed by the bumper beam by the cutter.

However, in the forming apparatus as described above, a separate support means for forming an irregular surface of the bottom portion is added, and an internal and external mandrel is used as the sweeping means, so that the configuration is very complicated.

Therefore, the present invention has been invented to solve the above problems, the object of the present invention is to gradually form a small amount of bending through the roll molding, it is possible to form a plate-shaped steel sheet material into a tube shape of a predetermined shape The present invention provides a molding apparatus for a bumper beam for a vehicle.

And since the forming process is all made by the roll former, there is another object to provide a molding apparatus that can simplify the configuration and reduce the manufacturing cost by eliminating the need for a conventional support means or a mandrel.

In order to realize this, the present invention comprises: roll forming means for roll forming a plurality of roll formers sequentially to form a strip-shaped steel sheet in a predetermined tube shape; First sweep forming means for gently bending the material formed by the roll forming means; A second sweep forming means for secondarily bending the material curved by the first sweep forming means according to a required curvature; Shape adjusting means for adjusting the material curved by the second sweep forming means to have a final shape as a bumper beam; It provides a bumper molding apparatus for a vehicle comprising a.

Joining means for joining both ends of the material whose final shape is adjusted by the shape adjusting means to form a tube having a completely closed structure; Cutting means for cutting the tube passing through the joining means to a predetermined length; It is characterized by including more.

1 is a schematic plan view of a bumper for explaining the application of the bumper beam produced by the present invention.

2 is a cross-sectional view taken along the line I-I of FIG.

3 is a cross-sectional view of the bumper beam manufactured according to the present invention.

4 is a view for explaining the manufacturing process of the bumper beam according to the present invention.

5 is a schematic side view of a forming apparatus for manufacturing a bumper beam of the present invention.

6 is a plan view of FIG.

7 is a front view showing an embodiment of a roll former applied to the present invention.

Figure 8a is a side view showing an embodiment of a roll former applied to the present invention.

FIG. 8B is a cross-sectional view taken along the line II-II of FIG. 8A.

9 is a side cross-sectional view of the first sweep forming means applied to the present invention.

10 is a side sectional view of a second sweep forming means applied to the present invention.

11 is a perspective view of a shape adjusting means applied to the present invention.

12 is another embodiment of a molding apparatus according to the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described in detail.

1 and 2 are a plan view and a cross-sectional view of a bumper to which the bumper beam manufactured according to the present invention is applied, and the bumper 2 is disposed in the vehicle width direction and fixed to the vehicle body by stays 4 and 6 on both rear parts thereof. A bumper beam 8, a shock absorbing member 10 disposed on the front surface of the beam 8, and a bumper cover 12 disposed on the front surface of the shock absorbing member 10 to cover and protect them.

As shown in FIG. 3, the bumper beam 8 is formed in the form of holding two chambers 14 and 16 up and down, and undergoes a multi-stage roll former by a molding apparatus as shown in FIG. Molding is performed in the same form.

First, referring to the configuration of the molding apparatus, a band-shaped high tensile steel sheet (material 18), which is a raw material of the bumper beam, is unwound through the uncoiler 20 in a state of being wound on a bobbin (not shown), and the straightener 22, which is the next process, is formed. Is supplied.

Then, the straightener 22 unfolds the raw material 18 released from the uncoiler 20 and then supplies it to the brake press 24 which is the next process, and in the brake press 24 thereof, Various holes are processed.

In other words, the uncoiler 20, the struttor 22, and the brake press 24 serve as a supply means for the raw material 18.

The material drawn out from the brake press 24 is gradually formed through the roll forming means 26 formed of a plurality of roll formers, and the final step is formed into a complete tube shape. It is made of a former, and has a gentle curvature while passing through the first sweep forming means 28, the height of which is gradually increased in the advancing direction.

In addition, the material 18 passing through the first sweep forming means 28 passes through the second sweep forming means 30 which bends to have a complete curvature required as a bumper beam, and the material 18 passes therethrough. Passes through the shape adjusting means 32 which adjusts the final shape for dimensional stability as the bumper beam 8.

And the material 18 is completed by the above process is welded to both ends while passing through the joining means 34 to form a complete tube, the material 18 made of a complete tube form in this way is finally cut means ( It is cut into the required length while passing through 36 and made into one bumper beam 8.

Each of the roll formers 38, 40, 42, 44, 46, 48, 50, 52, and (2) forming the roll forming means 26 and the first sweep forming means 28 above. 54, 56, 58 are sequentially arranged on the base place 60, as shown in Figure 6 to form a material supplied from the front.

As described above, the roll formers 38 to 58 forming the roll forming means 26 and the first sweep forming means 30 have only the same roller shapes, but the configurations thereof are the same. The former will be described with reference to the former 38 as an example.

That is, the roll former 38 has support members 62 and 64 which are erected at predetermined intervals in the width direction on the base place 60, and bearing members 66 to the support members 62 and 64. Up and down roller members (70, 72) disposed through the (68) and the upper bearing member (66) for supporting the upper roller (70) of the bearing members (66, 68) is a height adjustment means. Hold 74.

The support members 62 and 64 have a shape in which the middle portion is recessed to the lower side, and the bearing members 66 and 68 supporting the upper and lower rollers 70 and 72 in the opening 76 thereof. Combined.

The support members 62 and 64 and the bearing member 66 and 68 are coupled in a dovetail manner, and the upper bearing member 66 is lifted by the operation of the height adjusting means 74. The height of 70 can be adjusted.

The height adjusting means 74 is a screw rod 78 penetrating up and down the horizontal member 76 is fixed to the upper side of the support members 62, 64, and nuts screwed with the screw rod 78 ( 80) rotates the screw rod 78 by lifting and lowering the bearing member 66 connected to the lower end of the screw rod 78 while the screw rod 78 is rotated according to the rotational direction thereof, thereby adjusting its height according to the thickness of the workpiece. It will be possible.

And the roll former 54, 56, 58 forming the first sweep forming means 28 is made in the same manner as the roll former, as shown in Figure 9, the height of the roller gradually increases in the direction of progress The material 18 passing therethrough will have a gentle curvature.

Of course, three roll formers 54, 56 and 58 of the first sweep forming means 28 are illustrated in the drawings, but the present invention is not limited thereto and may be increased or decreased as necessary.

That is, when the first sweep forming means 28 has the curvature required for the material at a time, it becomes difficult to obtain the required curvature due to the spring back phenomenon or the like, and has a gentle curvature in the preparation step.

And the second sweep forming means 30, as shown in Figure 10, the lower support member 82 is placed on the base place 60, two lower rollers (84, 86) are arranged on the upper side, the rear side The rollers 86 were positioned to be positioned higher than the front rollers 84, and the upper rollers 88 were disposed between the rollers 84 and 86.

In the above, the arrangement position of the rear lower roller 86 and the upper roller 88 can obtain the required curvature according to these positions, and is determined according to the degree of curvature of the material 18.

In addition, the roll forming means 26, the first and second sweep forming means 28 and 30 are made of a roll former, and a predetermined driving means is required for their operation, and the driving means thereof. 6 and 7, the rotational power of the drive motor 90 is decelerated through the reducer 92 and output is made.

Its output is transmitted to a power transmission mechanism 94 for transmitting power to the upper and lower rollers of each of the roll formers 38 to 58 and the second sweep forming means 30, the first roll of which is a power transmission mechanism 94. The power transmission mechanism of the former 38 is connected to the reducer 94 by a predetermined transmission means 96.

In this case, the belt transmission method is adopted as the transmission means 96, but is not limited thereto, and a chain transmission method or a means for directly connecting the reduction gear 94 with the first roll former 38 may be adopted. .

And the power transmission mechanism 94 is arranged in the form of output in the direction orthogonal to this in a state connected in the longitudinal direction with each other, so that the roller rotation speed of each roll former is equal.

As a means for transmitting power in the orthogonal direction as described above, there are many embodiments, and a detailed description thereof will be omitted, and any one of many known power transmission mechanisms 94 of the present invention can be selected and used.

However, when the independent drive means which can make the rotation speed of each roll former the same can be comprised, this independent drive means can also be used.

And the material 18 passing through the second sweep forming means 30 is made to be adjusted so that the final shape required by the tube shape ever formed while passing through the shape adjusting means 32, the shape adjustment thereof The means 32 is coupled to the lower die 98, the upper side of the lower die 98 and the lower die 98, the upper side of the lower die 98 is formed, the upper side of the lower die 98 as shown in Fig. The upper die 102 formed with the same adjustment groove 100 as that of the upper surface of the material 18 is formed.

Accordingly, the final outer shape is adjusted while the material 18 passes between the adjustment grooves 96 and 100.

The material 18 finally adjusted through the above process is welded to both sides of the free end while passing through the welding machine as the joining means 34 to form a complete tube.

Although there are various kinds of welding machines used as the joining means 34 in the above, in the present invention, a welding machine using high frequency is used, and the high frequency welding machine is well known, and thus detailed description thereof will be omitted.

The material produced in the form of a complete tube while passing through the joining means 34 is cut to a predetermined length while passing through the cutting means 36.

In the above description, the predetermined length is set in consideration of the width of the bumper for the applied vehicle, and the cutting thereof becomes a complete bumper beam 8.

The cutting means 36 may be any one that can easily cut the tube bumper beam.

That is, the bumper beam 8 manufactured by the apparatus of the present invention as described above comprises a roll forming step in which a belt-shaped material 18 is gradually formed in a desired shape while passing through the roll forming means 26, and a roll The first sweep forming step of gently bending the molded material 18 to a predetermined curvature through the first sweep forming means 28 and the material 18 supplied from the first sweep forming means 28 are required. According to the curvature of the second sweep forming step to bend, the shape adjustment step of adjusting the material 18 subjected to the second sweep forming step to the final shape, and by welding the material undergoing the shape adjustment step The bumper beam may be manufactured through a joining step of forming a tube shape and a cutting step of cutting the material that has undergone the joining step into a required length as a bumper beam.

Bumper beams that can be produced through the forming step by the molding apparatus as described above may be various, but in the present invention, as an embodiment, two chambers 14 on both sides as shown in Figs. The following description will be made as an example of the manufacture of the bumper beam 8 in which) 16 is arranged in parallel.

That is, the above-mentioned roll forming step is performed to mold the inner walls 114 and 116 including the flanges 110 and 112 at both ends, and at predetermined intervals below the inner walls 114 and 116. Bending the upper wall 118, 120 and forming the outer wall 122, 124 by bending the lower part of the predetermined distance from the outer end of the upper wall 118, 120 upward. It is made by the process.

In the process of forming the inner walls 114 and 116 including the flanges 110 and 112 at both ends, the boundary portions 128 and 130 between the upper walls 118 and 120 and the inner walls 114 and 116. The part is gradually bent upwards, and at the same time, the flanges 110 and 112 are bent downward through approximately five steps at the boundary portions 132 and 134 of the inner walls 114 and 116. Molding takes place.

Of course, in the process of forming the inner wall 114, 116 and the flange 110, 112 as described above, the upper wall 118, 120 and outer wall 122, 124 is not completely molded, but the preparatory work As a result, these boundary portions 136, 138, 140, 142 are slightly bent upwardly.

After the inner walls 114 and 116 including the flanges 110 and 112 are formed through the above steps, the boundary 136 of the upper walls 118 and 120 and the outer walls 122 and 124 is formed. At the same time, the bending is performed at the outer walls 122 and 124 and the boundary walls 140 and 142 at the same time.

In the molding process as described above, the outer walls 122 and 124 are slightly bent into the upper portion thereof, and the outer walls 122 and 124 are slightly folded into the inner portion when the outer walls 122 and 124 are viewed in cross section. Is done.

When the molding is performed in the same manner as described above, the inner wall 114, 116 and the upper wall 118, 120, the upper wall 118, 120 and the outer wall 122, 124, the outer wall 122 The boundary between the 124 and the lower wall 126 is bent inward so as to correspond to each other. By welding these parts together, the bumper beam holding the two chambers 14 and 16 on both sides is welded. (8) can be formed.

Accordingly, as before, after forming the W-shaped main body so that one side is opened, it is possible to prevent the trouble of welding another plate again.

In the drawing, a portion of the lower wall 126 having a protrusion 144 and an irregular cross section having recesses 146 and 148 on both sides thereof is for improving the rigidity, and in this case, the upper wall 118 It is preferable to mold slowly from the initial molding of the 120 and the outer walls 122 and 124.

When forming the part forming each wall of each of the chambers 14 and 16 in the manufacturing process as described above, completely forming step by step from the flange (110) 112, the outermost end to the outer wall (122) (124) It is also possible to mold the next part afterwards, but it is possible to form each part gradually and repeatedly as described above, so that the spring back phenomenon does not occur in the final step and at the same time, the natural forming process is performed little by little to form each roll former ( This is to reduce the load on 38 ~ 58).

12 shows another embodiment of the molding apparatus according to the present invention, which shows an example in which the first sweep forming means 28 is gradually lowered according to the advancing direction of the material.

Accordingly, the second sweep forming means 30, the shape adjusting means 32, the joining and cutting means 34, 36, which are arranged in the rearward direction thereof, are arranged low, and these operations are the same as in the above embodiment. Description is omitted.

As described above, according to the present invention, by gradually forming a small amount of bending through roll forming, a bumper beam made of a plate-shaped steel sheet material in the form of a tube of a predetermined shape can be easily manufactured.

In addition, since the forming process is all performed by a roll former, there is no advantage in that a conventional support means, a mandrel, or the like is not necessary, thereby simplifying the configuration and reducing the manufacturing cost.

Claims (8)

Roll forming means for arranging a plurality of roll formers sequentially to roll-form a strip-shaped steel sheet into a predetermined tube shape; First sweep forming means for gently bending the material formed by the roll forming means; A second sweep forming means for secondarily bending the material curved by the first sweep forming means according to a required curvature; Shape adjusting means for adjusting the material curved by the second sweep forming means to have a final shape as a bumper beam; Bumper forming apparatus for a vehicle, characterized in that comprises a. The method of claim 1, further comprising: joining means for joining both ends of the material whose final shape is adjusted by the shape adjusting means to form a tube having a completely closed structure; Cutting means for cutting the tube passing through the joining means to a predetermined length; Bumper beam forming apparatus for a vehicle, characterized in that further comprises. The roll former according to claim 1, further comprising: a support member standing on the base plate at predetermined intervals in the width direction; Up and down rollers disposed through the bearing member through the support member; Height adjusting means for adjusting the height of the upper bearing member supporting the upper roller among the bearing members; Bumper beam forming apparatus for a vehicle, characterized in that comprises a. The bumper beam forming apparatus for a vehicle according to claim 1, wherein the first sweep forming means is disposed so that a plurality of roll formers gradually increases in the advancing direction of the material. The roll former according to claim 1 or 4, wherein the roll former forming the first sweep forming means comprises: a support member standing on the base plate at predetermined intervals in the width direction; Up and down rollers disposed through the bearing member through the support member; Height adjusting means for adjusting the height of the upper bearing member supporting the upper roller among the bearing members; Bumper beam forming apparatus for a vehicle, characterized in that comprises a. The method of claim 1, wherein the second sweep forming means is to place the lower support member on the base plate, and to arrange the two lower rollers on the upper side thereof, the rear roller is disposed so as to be higher than the front rollers, between the two rollers Bumper beam forming apparatus for a vehicle, characterized in that made by placing the upper roller in the. The method of claim 1, wherein the shape adjusting means comprises: a lower die having an adjustment groove formed in the same shape as the bottom surface of the upper material; An upper die coupled to an upper side of the lower die and having an adjustment groove formed at a lower side thereof in the same shape as an upper surface of a material; Bumper forming apparatus for a vehicle, characterized in that comprises a. The bumper beam forming apparatus for a vehicle according to claim 1, wherein the first sweep forming means is arranged such that a plurality of roll formers are gradually lowered in the advancing direction of the material.

Images