KR20240097341A - Curvature measuring device for aluminum extrusion material and method for measuring curvature of roof rail using the same - Google Patents

Abstract

A device for measuring the curvature of an aluminum extrusion material is provided. The curvature measuring device of the aluminum extrusion material is disposed adjacent to a mold in which the aluminum extrusion material having a curved shape is disposed, and the aluminum extrusion material disposed on the mold, and measures the curvature of the aluminum extrusion material. It may include a measuring unit and a monitoring unit that receives the curvature value of the aluminum extruded material measured through the curvature measuring unit and displays the curvature value of the aluminum extruded material.

Description

Curvature measuring device for aluminum extrusion material and method for measuring curvature of roof rail using the same {Curvature measuring device for aluminum extrusion material and method for measuring curvature of roof rail using the same}

The present invention relates to a device for measuring the curvature of an aluminum extruded material and a method for measuring the curvature of a roof rail using the same.

A roof rack is used to load or secure luggage on the roof of a vehicle and is a rod or bar-shaped stand installed vertically on both sides of the roof of the vehicle.

This roof rack is also called a roof rail, and it can be equipped with a separate carrier to load or secure leisure sports equipment such as bicycles, snowboards, and skis, so it is used in most recently released sports utility vehicles (SUVs). This trend is being installed.

Existing vehicle roof rails used a 3-piece method that combined injection molding with an aluminum extrusion pipe, but with the development of a 1-piece integrated roof rail, there is a trend from separate roof rails to integrated roof rails. The core technology in the 1-piece roof rail manufacturing process is the bending process technology. It is a plastic process that requires a complex process of tension, twist, and three-dimensional bending of the mating fixture, so there is a high possibility of defects due to spring back and necking phenomena. .

In particular, the frequency of production defects is high in areas where the curvature of the left and right ends of the product changes significantly, and quality fluctuations are severe depending on the material properties (yield strength). Therefore, we seek to develop an integrated aluminum roof rail through optimization of bending process technology that can manage and control variables in the overall process by considering differences in material properties, process conditions, and production equipment conditions.

Meanwhile, the existing quality measurement for roof rails is conducted through initial, intermediate, and final product inspection, and realistically, material quality is fully investigated only when defects occur. Real-time data collection in the field must be done manually by workers, resulting in a decrease in productivity, making it difficult to apply realistically, making it inaccurate to identify the influence or trend of production quality and measurement points by hardness.

For quality inspection, after the bending process, workers place the product on an inspection fixture and visually inspect it with a measuring tool (gap ruler). There are problems such as low data reliability because the inspection fixture and product are not accurately seated at the target position. Therefore, in order to improve process yield while quantifying accumulated data and ensuring reliability, the development of automated quality measurement devices and modules is very necessary.

One technical problem to be solved by the present invention is to provide a device and method that can easily measure the curvature of an aluminum extrusion material.

Another technical problem to be solved by the present invention is to provide an apparatus and method with improved curvature measurement reliability of aluminum extrusion materials.

Another technical problem to be solved by the present invention is to provide a curvature measuring device and method that can be linked to a method and device for manufacturing a roof rail for a vehicle.

The technical problems to be solved by the present invention are not limited to those described above.

In order to solve the above technical problems, the present invention provides a device for measuring the curvature of an aluminum extrusion material.

According to one embodiment, the device for measuring the curvature of the aluminum extrusion material is disposed adjacent to a mold in which the aluminum extrusion material having a curved shape is disposed, and the aluminum extrusion material disposed on the mold, and the aluminum extrusion material is disposed adjacent to the mold. It may include a curvature measuring unit that measures the curvature of, and a monitoring unit that receives the curvature value of the aluminum extruded material measured through the curvature measuring unit and displays the curvature value of the aluminum extruded material.

According to one embodiment, the curvature measurement unit includes a plurality of displacement measurement sensors, wherein the plurality of displacement measurement sensors each measure the curvature of the aluminum extrusion material by measuring distances to different areas of the aluminum extrusion material. It may include:

According to one embodiment, the curvature measuring unit includes first to third displacement measuring sensors, wherein the first displacement measuring sensor measures the distance to a first region of the aluminum extruded material, and the second displacement measuring sensor Measures the distance between the first area and a second area different from the aluminum extruded material, and the third displacement measurement sensor measures the distance between the first area and the second area and the third area different from the aluminum extruded material. It may include:

According to one embodiment, the first to third displacement measurement sensors may include measuring the distance to the aluminum extrusion material through laser irradiation.

According to one embodiment, the aluminum extrusion material may include a roof rail for a vehicle.

A device for measuring the curvature of an aluminum extrusion material according to an embodiment of the present invention is disposed adjacent to a mold in which the aluminum extrusion material having a curved shape is disposed, the aluminum extrusion material disposed on the mold, and the aluminum extrusion material. It may include a curvature measuring unit that measures the curvature of, and a monitoring unit that receives the curvature value of the aluminum extruded material measured through the curvature measuring unit and displays the curvature value of the aluminum extruded material. Accordingly, automation and real-time measurement of quality measurement can be achieved.

1 to 3 are perspective views illustrating a device for measuring the curvature of an aluminum extrusion material according to an embodiment of the present invention.
Figure 4 is a diagram specifically showing the left side of the device for measuring the curvature of an aluminum extrusion material according to an embodiment of the present invention.
Figure 5 is a diagram specifically showing the right side of an aluminum extrusion material according to an embodiment of the present invention.
Figure 6 is a flow chart for explaining a method of manufacturing a roof rail for a vehicle according to an embodiment of the present invention.
Figure 7 is a diagram for explaining steps S110 and S120 in the method of manufacturing a roof rail for a vehicle according to an embodiment of the present invention.
Figure 8 is a diagram for explaining steps S120 and S130 in the method of manufacturing a roof rail for a vehicle according to an embodiment of the present invention.
Figure 9 is a diagram for explaining step S140 in the method of manufacturing a roof rail for a vehicle according to an embodiment of the present invention.
Figure 10 is a flowchart for explaining a method of manufacturing a roof rail for a vehicle according to a first modified example of the present invention.
Figure 11 is a diagram for explaining step S140 in the method of manufacturing a roof rail for a vehicle according to a second modification of the present invention.
Figure 12 is a diagram for explaining a mold used in step S140 of the method of manufacturing a roof rail for a vehicle according to a third modification of the present invention.
Figure 13 is a diagram for explaining the process of bending the base tube in step S140 of the method of manufacturing a roof rail for a vehicle according to a third modified example of the present invention.
Figure 14 is a diagram for explaining the state in which the heating wire is disposed in the base tube in step S125 of the method of manufacturing a roof rail for a vehicle according to a fourth modification of the present invention.
Figure 15 is a diagram for explaining the state in which the heating wire is disposed in the base tube in step S125 of the method of manufacturing a roof rail for a vehicle according to a fifth modification of the present invention.
Figure 16 is a diagram for explaining a mold used in step S140 of the method of manufacturing a roof rail for a vehicle according to a sixth modification of the present invention.
Figure 17 is a diagram for explaining the upper mold used in step S140 of the method of manufacturing a roof rail for a vehicle according to a sixth modification of the present invention.
Figure 18 is a diagram for explaining the lower mold used in step S140 of the method of manufacturing a roof rail for a vehicle according to a sixth modification of the present invention.
Figure 19 is a diagram for explaining the process of bending the base tube in step S140 of the method of manufacturing a roof rail for a vehicle according to a sixth modification of the present invention.
Figure 20 is a diagram for explaining the mold and base tube bending process used in step S140 of the method of manufacturing a roof rail for a vehicle according to the seventh modification of the present invention.
Figure 21 is a diagram for explaining the mold and base tube bending process used in step S140 of the method of manufacturing a roof rail for a vehicle according to the eighth modification of the present invention.
Figure 22 is a photograph taken of the base tube in a bent state during the roof rail manufacturing process according to Experimental Example 1 of the present invention.
Figure 23 is a photograph taken of the base tube in a bent state during the roof rail manufacturing process according to Experimental Example 2 of the present invention.
Figure 24 is a photograph of a roof rail manufactured by the roof rail manufacturing method according to Experimental Example 3 of the present invention.
Figure 25 is a photograph taken of the base tube in a bent state during the roof rail manufacturing process according to Experimental Example 4 of the present invention.
Figure 26 is a photograph taken of the base tube in a bent state during the roof rail manufacturing process according to Experimental Example 5 of the present invention.
Figure 27 is additional photos of defective products generated during the roof rail manufacturing process.
Figure 28 is additional photos of good quality roof rails.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, the technical idea of the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content will be thorough and complete and so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art.

In this specification, when an element is referred to as being on another element, it means that it may be formed directly on the other element or that a third element may be interposed between them. Additionally, in the drawings, the thicknesses of films and regions are exaggerated for effective explanation of technical content.

Additionally, in various embodiments of the present specification, terms such as first, second, and third are used to describe various components, but these components should not be limited by these terms. Accordingly, what is referred to as a first component in one embodiment may be referred to as a second component in another embodiment.

Each embodiment described and illustrated herein also includes its complementary embodiment. Additionally, in this specification, 'and/or' is used to mean including at least one of the components listed before and after.

In the specification, singular expressions include plural expressions unless the context clearly dictates otherwise. In addition, terms such as "include" or "have" are intended to designate the presence of features, numbers, steps, components, or a combination thereof described in the specification, but are not intended to indicate the presence of one or more other features, numbers, steps, or components. It should not be understood as excluding the possibility of the presence or addition of elements or combinations thereof.

In addition, in the following description of the present invention, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

Apparatus for measuring curvature of aluminum extrusion material according to an embodiment

1 to 3 are perspective views for explaining a device for measuring the curvature of an aluminum extruded material according to an embodiment of the present invention, and Figure 4 specifically shows the left side of the device for measuring the curvature of an aluminum extruded material according to an embodiment of the present invention. It is a drawing, and Figure 5 is a drawing specifically showing the right side of the aluminum extrusion material according to an embodiment of the present invention.

Referring to FIGS. 1 to 5 , an apparatus for measuring the curvature of an aluminum extruded material according to an embodiment of the present invention may include a mold 100, a curvature measuring unit 200, and a monitoring unit 300. The aluminum extrusion material to be measured using the curvature measuring device for the aluminum extrusion material may be a vehicle roof rail manufactured through an aluminum tube. In other words, the curvature of the vehicle roof rail can be measured using the curvature measuring device of the aluminum extrusion material.

The mold 100 is intended to support an aluminum extrusion material (BT) and may have a curved shape. For example, the mold 100 may have a shape that becomes more convex from the outer part to the central part.

The curvature measuring unit 200 may be arranged adjacent to the aluminum extrusion material (BT) disposed on the mold 100. According to one embodiment, the curvature measuring unit 200 includes a plurality of displacement measurement sensors 210, 220, and 230, and each of the plurality of displacement sensors 210, 220, and 230 is the aluminum extrusion. Distances can be measured for different areas of the material (BT). The curvature measuring unit 200 may measure the curvature of the aluminum extrusion material BT using the distance measured from the plurality of displacement sensors 210, 220, and 230.

For example, the curvature measurement unit 200 may include a first displacement measurement sensor 210, a second displacement measurement sensor 220, and a third displacement measurement sensor 230. The first displacement measurement sensor 210 can measure the distance to the first area of the aluminum extrusion material (BT). In contrast, the second displacement measurement sensor 220 can measure the distance to the second area of the aluminum extruded material (BT). In contrast, the third displacement measurement sensor 230 can measure the distance to the third area of the aluminum extruded material (BT). The first to third regions of the aluminum extrusion material (BT) may be different regions.

The curvature measuring unit 200 includes the distance to the aluminum extruded material (BT) measured through the first displacement measurement sensor 210, and the aluminum extruded material measured through the second displacement measurement sensor 220 ( The curvature of the aluminum extruded material (BT) can be measured through the distance to the aluminum extruded material (BT) and the distance to the aluminum extruded material (BT) measured through the third displacement measurement sensor 230.

According to one embodiment, the first to third displacement measurement sensors 210, 220, and 230 may measure the distance to the aluminum extrusion material BT through laser irradiation. In contrast, according to another embodiment, the first to third displacement measurement sensors 210, 220, and 230 measure the distance to the aluminum extrusion material (BT) through contact with the aluminum extrusion material (BT). You can.

The monitoring unit 300 may receive the curvature value of the aluminum extruded material (BT) measured through the curvature measuring unit 200 and visually display the curvature value of the aluminum extruded material (BT).

Above, a device for measuring the curvature of an aluminum extrusion material according to an embodiment of the present invention has been described. Hereinafter, a method of manufacturing a roof rail for a vehicle according to embodiments and modified examples of the present invention will be described.

The curvature of the roof rail manufactured through the vehicle roof rail manufacturing method according to the above embodiments and modified examples may be measured using a curvature measuring device of the aluminum extruded material. In other words, the method of manufacturing a roof rail for a vehicle and the apparatus for measuring the curvature of the aluminum extrusion material according to the above embodiments and modified examples can form a manufacturing and inspection system for a roof rail for a vehicle. Because of this, quick feedback can be provided on the manufactured roof rail, so response to defective roof rails at the manufacturing site can be made more quickly.

Method for manufacturing vehicle roof rails according to embodiments

Figure 6 is a flow chart for explaining a method of manufacturing a roof rail for a vehicle according to an embodiment of the present invention, and Figure 7 is a diagram for explaining steps S110 and S120 of the method for manufacturing a roof rail for a vehicle according to an embodiment of the present invention. Figure 8 is a diagram for explaining steps S120 and S130 in the method for manufacturing a roof rail for a vehicle according to an embodiment of the present invention, and Figure 9 is a diagram for explaining step S140 in the method for manufacturing a roof rail for a vehicle according to an embodiment of the present invention. It is a drawing.

Referring to FIGS. 6 to 9, a base tube (BT) may be prepared (S110). According to one embodiment, the base tube BT may have a structure with an empty space formed therein. Additionally, the base tube BT may include aluminum. That is, the base tube BT may be an aluminum tube with an empty space formed therein. Additionally, the base tube BT may be the same as the aluminum extrusion material whose curvature is to be measured through a curvature measuring device for the aluminum extrusion material.

The base tube (BT) may be stretched so that the base tube (BT) extends in the longitudinal direction (S120). According to one embodiment, the base tube BT may be extended to be longer than 1.3% and less than 2.2% compared to the initial length.

Fluid F may be injected into the empty space inside the extended base tube BT (S130). According to one embodiment, the fluid F may be injected so that all empty spaces inside the extended base tube BT are filled. For example, the fluid F may be a liquid.

As the fluid F is filled inside the base tube BT, pressure directed from the inside to the outside may be applied to the base tube BT. That is, hydraulic pressure may be applied from the inside to the outside of the base tube BT by the fluid F. Accordingly, the base tube BT can be maintained in an expanded state.

After the base tube (BT) is filled with fluid (F), holders (L) may be mounted on one side and the other side of the base tube (BT), respectively. The holder (L) can prevent the fluid (F) filled inside the base tube (BT) from leaking out from the inside of the base tube (BT).

After the base tube (BT) into which the fluid has been injected is brought into contact with the mold (M), pressure can be applied to both ends of the base tube (BT) to bend the base tube (BT) (S140) . Accordingly, a roof rail for a vehicle can be manufactured.

According to one embodiment, the mold M may have a curved upper surface. Specifically, the upper surface of the mold M may have a shape that becomes more convex from the outer part to the central part.

Pressure may be applied to both ends of the base tube (BT) while in contact with the upper surface of the mold (M). Accordingly, the base tube BT may be bent to have the same shape as the upper surface of the mold M.

As described above, as the base tube BT is bent while the fluid F is injected into the base tube BT, buckling occurs in the base tube BT. And cracks can be reduced. On the other hand, when the base tube (BT) is bent without the fluid (F) being injected into the base tube (BT), buckling occurs inside the bent portion of the base tube (BT). and cracks may form on the outside. Accordingly, the defect rate of the vehicle roof rail may increase.

However, when bending is performed on the base tube (BT) while the fluid (F) is injected into the base tube (BT), the fluid (F) in the bending process causes the base tube (BT) to bend. As hydraulic pressure is applied from the inside to the outside, the base tube BT can be maintained in an expanded state, thereby reducing the occurrence of buckling and cracks. Because of this, the defect rate of the roof rail for the vehicle can be reduced.

In addition, by controlling the length to which the base tube (BT) extends in the step of stretching the base tube (BT), buckling and cracks generated in the base tube (BT) are prevented in the process of bending the base tube (BT). This can be controlled. Specifically, as described above, the length of the base tube (BT) is extended to be longer than 1.3% and less than 2.2% compared to the initial length, so that during the bending process of the base tube (BT), Buckling and cracks that occur can be reduced. On the other hand, when the length of the base tube (BT) is extended to be 1.3% or less longer or 2.2% or more longer than the initial length, buckling and cracks occurring in the base tube (BT) may increase. . Accordingly, the defect rate of the vehicle roof rail may increase.

That is, the method of manufacturing a roof rail for a vehicle according to an embodiment of the present invention includes preparing a base tube (BT) with an empty space formed therein, forming the base tube (BT) so that the base tube (BT) extends in the longitudinal direction. Stretching, injecting fluid (F) into the empty space inside the extended base tube (BT), and bringing the base tube (BT) into which the fluid (F) has been injected into contact with the mold (M) , may include bending the base tube (BT) by applying pressure to both ends of the base tube (BT). Accordingly, buckling and cracks occurring during the bending process can be reduced. As a result, a vehicle roof rail with improved reliability can be provided by reducing the defect rate.

Method for manufacturing a vehicle roof rail according to the first modification example

Figure 10 is a flowchart for explaining a method of manufacturing a roof rail for a vehicle according to a first modified example of the present invention.

Referring to FIG. 10, the method of manufacturing a roof rail for a vehicle according to the first modified example of the present invention includes preparing a base tube (S110) and first injecting fluid into an empty space inside the base tube (S115). , stretching the base tube (S120), secondary injection of fluid into the empty space inside the extended base tube (S130), and bending the base tube into which the fluid has been injected (S140). can do.

The steps S110, S120, S130, and S140 included in the method for manufacturing a roof rail for a vehicle according to the first modified example are the method for manufacturing a roof rail for a vehicle according to the embodiment described with reference to FIGS. 6 to 9. This may be the same as steps S110, S120, S130, and S140.

That is, the method of manufacturing a roof rail for a vehicle according to the first modified example has a difference in that step S115 is performed between step S110 and step S120 compared to the method of manufacturing a roof rail according to the above embodiment.

In addition, the method of manufacturing a vehicle roof rail according to the first modified example includes hydraulic pressure applied to the base tube BT through primary injection of fluid in step S115 and secondary injection of fluid in step S130. The hydraulic pressure applied to the base tube BT may be different.

Specifically, the hydraulic pressure applied to the base tube (BT) through the first injection of fluid in step S115 may be smaller than the hydraulic pressure applied to the base tube (BT) through the secondary injection of fluid in step S130. there is. For example, the liquid pressure applied to the base tube BT through the first injection of fluid in step S115 may be 115 MPa. In contrast, the liquid pressure applied to the base tube BT through secondary injection of fluid in step S130 may be 200 to 600 MPa.

As described above, since hydraulic pressure is applied to the base tube through injection of fluid even before the base tube is extended, the defect rate occurring in the process of stretching the base tube can be reduced.

Method for manufacturing vehicle roof rail according to second modification example

The method of manufacturing a roof rail for a vehicle according to a second modified example of the present invention includes preparing a base tube (S110), stretching the base tube (S120), and injecting fluid into an empty space inside the extended base tube. A step (S130), and a step of bringing the base tube into which the fluid is injected into contact with the mold, then sucking the base tube in contact with the mold through a plurality of holes formed in the mold, and bending the base tube (S140) ) may include.

Steps S110, S120, and S130 included in the method for manufacturing a roof rail for a vehicle according to the second modified example are the steps included in the method for manufacturing a roof rail for a vehicle according to the embodiment described with reference to FIGS. 6 to 9. It may be the same as step S110, step S120, and step S130.

That is, the method of manufacturing a roof rail for a vehicle according to the second modified example has a different step S140 compared to the method of manufacturing a roof rail according to the above embodiment. Hereinafter, the method of manufacturing a roof rail for a vehicle according to the second modified example will be described in detail with respect to step S140.

Figure 11 is a diagram for explaining step S140 in the method of manufacturing a roof rail for a vehicle according to a second modification of the present invention.

Referring to FIG. 11, the mold M used in step S140 may have a curved upper surface. Specifically, the upper surface of the mold M may have a shape that becomes more convex from the outer part to the central part.

Additionally, a plurality of through holes (h) may be formed inside the mold (M). According to one embodiment, the through hole (h) may be formed to penetrate the lower and upper surfaces of the mold (M). The plurality of through holes (h) may be arranged to be spaced apart at regular intervals along the longitudinal direction of the mold (M). The longitudinal direction of the mold (M) may be perpendicular to the direction from the lower surface of the mold (M) to the upper surface.

When the upper surface of the mold (M) is in contact with the base tube (BT), the base tube (BT) may be sucked through the plurality of through holes (h) of the mold (M). Accordingly, the base tube (BT) may be bent along the shape of the upper surface of the mold (M).

According to one embodiment, among the plurality of through holes (h), different suction forces may be applied to the through hole (h) disposed in the central portion of the mold (M) and the through hole (h) disposed in the outer portion. . Specifically, a relatively weak suction force may be applied to the through hole (h) disposed in the center of the mold (M). In contrast, a relatively strong suction force may be applied to the through hole (h) disposed on the outer portion of the mold (M). Accordingly, a relatively strong suction force is applied to both ends of the base tube BT, where a relatively large deformation is required, and a relatively weak suction force is applied to the center of the base tube BT, which requires a relatively small deformation. Bending of the base tube BT can be performed efficiently.

Method for manufacturing vehicle roof rail according to third modification example

The method of manufacturing a roof rail for a vehicle according to a third modified example of the present invention includes preparing a base tube (S110), stretching the base tube (S120), and injecting fluid into an empty space inside the extended base tube. A step (S130), and a step of bending the base tube by bringing the base tube into which the fluid is injected into contact with the mold and then forming a vacuum between the mold and the base tube through a plurality of holes formed in the mold. (S140) may be included.

Steps S110, S120, and S130 included in the method for manufacturing a roof rail for a vehicle according to the third modified example are the steps included in the method for manufacturing a roof rail for a vehicle according to the embodiment described with reference to FIGS. 6 to 9. It may be the same as step S110, step S120, and step S130.

That is, the method of manufacturing a roof rail for a vehicle according to the third modified example has a different step S140 compared to the method of manufacturing a roof rail according to the above embodiment. Hereinafter, the method of manufacturing a roof rail for a vehicle according to the third modified example will be described in detail with respect to step S140.

Figure 12 is a diagram for explaining a mold used in step S140 of the method for manufacturing a roof rail for a vehicle according to a third modification of the present invention, and Figure 13 is a diagram for explaining a mold used in step S140 of the method for manufacturing a roof rail for a vehicle according to a third modification of the present invention. This is a drawing to explain the process of bending the base tube in each step.

Figure 12 (a) shows a top view of the mold (M) used in step S140, and Figure 12 (b) shows a cross-sectional schematic view of the mold (M) used in step S140.

Referring to Figures 12 (a) and (b), the mold (M) used in step S140 may have a groove (GV) having the same shape as the base tube (BT) formed on the upper surface. . The groove GV may have a curved shape. Specifically, the groove GV may have a shape that becomes concave from the outer part to the central part.

Additionally, a plurality of through holes (h) may be formed inside the mold (M). According to one embodiment, the through hole (h) may be formed to penetrate the lower and upper surfaces of the mold (M). The plurality of through holes (h) may be arranged to be spaced apart at regular intervals along the longitudinal direction of the mold (M). The longitudinal direction of the mold (M) may be perpendicular to the direction from the lower surface of the mold (M) to the upper surface.

Referring to FIG. 13, the base tube (BT) is disposed on the upper surface of the mold (M), and the groove (GV) is empty between the upper surface of the mold (M) and the base tube (BT). It can be arranged to remain in space.

In the above-described state, the base tube (BT) can be sucked through the plurality of through holes (h) of the mold (M). Accordingly, a vacuum may be formed between the base tube (BT) and the mold (M). According to one embodiment, a rubber packing (PC) may be disposed on the outer portion of the groove (GV). Accordingly, a vacuum can be easily formed between the mold (M) and the base tube (BT). As a vacuum is formed between the base tube (BT) and the mold (M), the base tube (BT) may be bent along the shape of the upper surface of the mold (M).

Method for manufacturing vehicle roof rail according to fourth modification example

The method of manufacturing a roof rail for a vehicle according to a fourth modification of the present invention includes preparing a base tube (S110), stretching the base tube (S120), and placing a heating wire in an empty space inside the extended base tube. step (S125), injecting fluid into an empty space inside the extended base tube (S130), and bringing the base tube into which the fluid has been injected into contact with the mold, heating the fluid through the heating wire and It may include bending the base tube by applying pressure to both ends of the base tube (S140).

The steps S110, S120, S130, and S140 included in the method of manufacturing a roof rail for a vehicle according to the fourth modified example are the method for manufacturing a roof rail for a vehicle according to the embodiment described with reference to FIGS. 6 to 9. This may be the same as steps S110, S120, S130, and S140.

That is, the method of manufacturing a roof rail for a vehicle according to the fourth modified example has a difference in that step S125 is performed between step S120 and step S130 compared to the method of manufacturing a roof rail according to the above embodiment. In addition, there is a difference in that in step S140, the fluid is heated through a heating wire and the base tube is bent. Hereinafter, steps S125 and S140 will be described in detail.

Figure 14 is a diagram for explaining the state in which the heating wire is disposed in the base tube in step S125 of the method of manufacturing a roof rail for a vehicle according to a fourth modification of the present invention.

Referring to FIG. 14, in step S125, a heating wire (HL) is placed in the empty space inside the base tube (BT), and the heating wires (HL) may be placed at the edges of the base tube (BT). . The edge of the base tube (BT) corresponds to the edge of the mold (M) and may be an area where the greatest curvature occurs when the base tube (BT) is bent.

In step S140, the fluid is heated through the heating wire HL and pressure is applied to both ends of the base tube BT to bend the base tube BT. The base tube BT can be bent more efficiently by heated fluid. Additionally, since selective heating can be performed on the edge portion where the curvature is greatest during the bending process of the base tube BT, defects such as buckling and cracks occurring during the bending process can be significantly reduced.

Method for manufacturing vehicle roof rails according to the fifth modification example

The method of manufacturing a roof rail for a vehicle according to a fifth modification of the present invention includes preparing a base tube (S110), stretching the base tube (S120), and placing a heating wire in an empty space inside the extended base tube. step (S125), injecting fluid into an empty space inside the extended base tube (S130), and bringing the base tube into which the fluid has been injected into contact with the mold, heating the fluid through the heating wire and It may include bending the base tube by applying pressure to both ends of the base tube (S140).

That is, the method of manufacturing a roof rail for a vehicle according to the fifth modification example may be the same as the method of manufacturing a roof rail for a vehicle according to the fourth modification example. However, in the method of manufacturing a roof rail for a vehicle according to the fifth modification, the position of the heating wire disposed in the base tube in step S125 may be different from the method of manufacturing a roof rail for a vehicle according to the fourth modification. Hereinafter, step S125 will be described in detail.

Figure 15 is a diagram for explaining the state in which the heating wire is disposed in the base tube in step S125 of the method of manufacturing a roof rail for a vehicle according to a fifth modification of the present invention.

Referring to FIG. 15, in step S125, a heating wire (HL) is placed in the empty space inside the base tube (BT), and the heating wires (HL) may be placed at the edges of the base tube (BT). . The edge of the base tube (BT) corresponds to the edge of the mold (M) and may be an area where the greatest curvature occurs when the base tube (BT) is bent.

Additionally, the heating wire HL may be disposed adjacent to the first inner surface I 1 of the first _inner surface I ₁ and the second inner surface I ₂ of the base tube BT. According to one embodiment, the first inner surface (I ₁ ) may be defined as an inner surface disposed in the opposite direction to the area where the base tube (BT) is in contact with the mold (M). In contrast, the second inner surface I ₂ may be defined as an inner surface adjacent to an area where the base tube BT is in contact with the mold M.

In the process of bending the base tube (BT), higher stretching may occur on the first outer surface (O ₁ ) of the base tube (BT) than on the second outer surface (O ₂ ). Accordingly, buckling and cracks may occur more easily on the first outer surface (O ₁ ) than on the second outer surface (O ₂ ). According to one embodiment, the first outer surface O ₁ may be defined as an outer surface disposed in a direction opposite to the area where the base tube BT is in contact with the mold M. In contrast, the second outer surface O ₂ may be defined as an outer surface adjacent to the area where the base tube BT is in contact with the mold M.

For this reason, the heating wire (HL) is arranged adjacent to the first inner surface (I ₁ ) so that the heat generated from the heating wire (HL) can be more easily transferred to the first outer surface (O ₁ ). It can be.

Method for manufacturing vehicle roof rails according to the sixth modification example

The method of manufacturing a roof rail for a vehicle according to the sixth modification of the present invention includes preparing a base tube (S110), stretching the base tube (S120), and injecting fluid into an empty space inside the extended base tube. A step (S130), and placing the base tube into which the fluid has been injected between the lower mold and the upper mold, then supplying fluid to the lower mold to apply hydraulic pressure to the base tube, thereby bending the base tube ( S140) may be included.

Steps S110, S120, and S130 included in the method of manufacturing a roof rail for a vehicle according to the sixth modified example are the steps included in the method for manufacturing a roof rail for a vehicle according to the embodiment described with reference to FIGS. 6 to 9. It may be the same as step S110, step S120, and step S130.

That is, the method of manufacturing a roof rail for a vehicle according to the sixth modified example has a different step S140 compared to the method of manufacturing a roof rail according to the above embodiment. Hereinafter, the method of manufacturing a roof rail for a vehicle according to the sixth modified example will be described in detail with respect to step S140.

FIG. 16 is a diagram for explaining a mold used in step S140 of the method for manufacturing a roof rail for a vehicle according to a sixth modification of the present invention, and FIG. 17 is a view for explaining a mold used in step S140 of the method for manufacturing a roof rail for a vehicle according to a sixth modification of the present invention. Figure 18 is a diagram for explaining the upper mold used in step S140 of the vehicle roof rail manufacturing method according to the sixth modification of the present invention, and Figure 19 is a diagram for explaining the lower mold used in step S140 of the present invention. This is a diagram to explain the process of bending the base tube in step S140 of the vehicle roof rail manufacturing method according to the sixth modification of .

16 to 19, the mold 400 used in step S140 may include an upper mold 410 and a lower mold 420. According to one embodiment, the upper mold 410 and the lower mold 420 are disposed to face each other, and the base tube BT is disposed between the upper mold 410 and the lower mold 420. It can then be bent.

The upper mold 410 includes a molding member 412 that contacts the base tube BT and bends the base tube BT, and is disposed around the molding member 412 to form the molding member 412. It may include a support member 411 for fixing it.

According to one embodiment, the lower surface of the molding member 412 may have a curved shape. Specifically, the lower surface of the molding member 412 may have a shape that becomes concave from the outer part to the central part. Accordingly, when the base tube (BT) is bent through the forming member 412, the base tube (BT) may have a shape that becomes more convex from the outer part to the central part.

The lower mold 420 may have a fluid receiving groove (FV) formed on its upper surface. Fluid can be accommodated in the fluid receiving groove (FV). For example, the fluid may be a liquid. Additionally, the lower mold 420 may have a fluid inlet 420a formed on one side. The fluid inlet 420a and the fluid receiving groove FV may be connected through a fluid flow path FL. Accordingly, the fluid flowing in through the fluid inlet 420a may be supplied to the fluid receiving groove FV through the fluid flow path FL.

The base tube BT may be placed on the lower mold 420. Specifically, the base tube BT may be disposed on the upper surface of the base tube BT so as to completely cover the fluid receiving groove FV of the lower mold 420 . Additionally, when the base tube BT is disposed on the lower mold 420, the base tube BT may be fixed to the lower mold 420.

After the base tube BT is placed on the lower mold 420, the upper mold 410 and the lower mold 420 may be in contact. Specifically, the lower surface of the molding member 412 of the upper mold 410 may be in contact with the fluid receiving groove (FV) of the lower mold 420 to face each other. Accordingly, the base tube BT may be disposed between the molded member 412 and the fluid receiving groove FV.

When the upper mold 410 and the lower mold 420 are in contact, pressure may be applied to the upper mold 410 and the lower mold 420, respectively. For example, pressure may be applied to the upper mold 410 in the direction of the lower mold 420. On the other hand, pressure may be applied to the lower mold 420 in the direction of the upper mold 410.

Accordingly, the base tube BT disposed between the upper mold 410 and the lower mold 420 can be more firmly fixed by the upper mold 410 and the lower mold 420. Additionally, the fluid receiving groove (GV) may be sealed by the base tube (BT).

When the upper mold 410 and the lower mold 420 are in contact, fluid F may be supplied through the fluid inlet 420a of the lower mold 420. The fluid F supplied through the fluid inlet 420a may be supplied to the fluid receiving groove GV through the fluid flow path FL. The fluid F supplied to the fluid receiving groove GV may apply pressure to the base tube BT. Specifically, the fluid F supplied to the fluid receiving groove GV may apply pressure to the base tube BT in the direction of the molding member 412 of the upper mold 410. Accordingly, the base tube BT may be bent along the shape of the molding member 412 after contacting the molding member 412.

Method for manufacturing vehicle roof rails according to the seventh modification example

The method of manufacturing a roof rail for a vehicle according to the seventh modification of the present invention includes preparing a base tube (S110), stretching the base tube (S120), and injecting fluid into an empty space inside the extended base tube. a step (S130), and a step (S140) of bending the base tube by placing the fluid-injected base tube between the lower mold and the upper mold and applying pressure to the lower mold and the upper mold. It can be included.

Steps S110, S120, and S130 included in the method for manufacturing a roof rail for a vehicle according to the seventh modification are the steps included in the method for manufacturing a roof rail for a vehicle according to the embodiment described with reference to FIGS. 6 to 9. It may be the same as step S110, step S120, and step S130.

That is, the method of manufacturing a roof rail for a vehicle according to the seventh modification example has a different step S140 compared to the method of manufacturing a roof rail according to the above embodiment. Hereinafter, the method of manufacturing a roof rail for a vehicle according to the seventh modified example will be described in detail with respect to step S140.

Figure 20 is a diagram for explaining the mold and base tube bending process used in step S140 of the vehicle roof rail manufacturing method according to the seventh modification of the present invention.

Referring to FIG. 20, the mold 400 used in step S140 may include an upper mold 410 and a lower mold 420. According to one embodiment, the upper mold 410 and the lower mold 420 are disposed to face each other, and the base tube BT is disposed between the upper mold 410 and the lower mold 420. It can then be bent.

The upper mold 410 may have a curved lower surface. Specifically, the lower surface of the upper mold 410 may have a shape that becomes curved from the outer part to the central part.

Alternatively, the lower mold 420 may have a curved upper surface. Specifically, the upper surface of the lower mold 420 may have a shape that becomes convex from the outer part to the central part.

In a state where the lower surface of the upper mold 410 and the upper surface of the lower mold 420 are arranged to face each other, the base is positioned between the lower surface of the upper mold 410 and the upper surface of the lower mold 420. A tube (BT) may be placed.

Thereafter, pressure may be applied to the upper mold 410 and the lower mold 420, respectively. Specifically, pressure may be applied to the upper mold 410 in the direction of the lower mold 420. In contrast, pressure may be applied to the lower mold 420 in the direction of the upper mold 410.

Accordingly, the base tube BT disposed between the upper mold 410 and the lower mold 420 may be bent by the upper mold 410 and the lower mold 420.

Method for manufacturing vehicle roof rails according to the 8th modification

The method of manufacturing a roof rail for a vehicle according to the eighth modification of the present invention includes preparing a base tube (S110), stretching the base tube (S120), and injecting fluid into an empty space inside the extended base tube. It may include a step (S130), and a step (S140) of bending the base tube into which the fluid has been injected using a fixed mold and a rotating mold.

Steps S110, S120, and S130 included in the method for manufacturing a roof rail for a vehicle according to the eighth modification are the steps included in the method for manufacturing a roof rail for a vehicle according to the embodiment described with reference to FIGS. 6 to 9. It may be the same as step S110, step S120, and step S130.

That is, the method of manufacturing a roof rail for a vehicle according to the eighth modified example has a different step S140 compared to the method of manufacturing a roof rail according to the above embodiment. Hereinafter, the method of manufacturing a roof rail for a vehicle according to the sixth modification example will be described in detail with respect to step S140.

Figure 21 is a diagram for explaining the mold and base tube bending process used in step S140 of the vehicle roof rail manufacturing method according to the eighth modification of the present invention.

Referring to FIG. 21, the mold used in step S140 may include a first mold 510 and a second mold 520.

The first mold 510 is arranged to surround the central portion of the base tube BT and can fix the position of the base tube BT. Alternatively, the second mold 520 may be placed on the outer portion of the base tube BT and may be placed in contact with the lower surface of the base tube BT.

With the first mold 510 disposed in the center of the base tube BT and the second mold 520 disposed in the outer lower surface of the base tube BT, the base tube BT Pressure may be applied to both ends of . Specifically, pressure may be applied from the upper surface to the lower surface of the base tube BT. Accordingly, both ends of the base tube BT may be bent by the second mold 520.

According to one embodiment, the second mold 520 may be moved between the end and the center of the base tube BT. As the second mold 520 moves, the bending shape of the base tube BT may change. For example, when the second mold 520 is placed adjacent to the end of the base tube BT, only the end of the base tube BT may be slightly bent. In contrast, when the second mold 520 is disposed adjacent to the center of the base tube BT, the base tube BT may be bent as a whole.

Additionally, the second mold 520 may be rotated while the base tube BT is bent. According to one embodiment, the second mold 520 may be rotated in the same direction as the base tube BT is bent. That is, the second mold 520 can be rotated counterclockwise with the Z-axis direction in FIG. 16 as the rotation axis. Accordingly, buckling formed during the bending process of the base tube BT can be reduced. Specifically, during the bending process of the base tube BT, buckling can be easily formed in the inner portion where the curvature is formed. However, as described above, when the second module 520 is rotated in the inner part where the curvature is formed, the surface of the base tube BT is pushed by the second module 520, causing buckling. Even if it does, it can be straightened out again, so buckling formation can be significantly reduced.

Above, a method of manufacturing a roof rail for a vehicle according to embodiments and modified examples of the present invention has been described. Hereinafter, specific experimental examples and characteristic evaluation results of the method for manufacturing a vehicle roof rail according to an embodiment of the present invention will be described.

Roof rail manufacturing according to Experimental Example 1

The roof rail was manufactured by the method described with reference to FIGS. 6 to 9, but in the process of stretching the base tube, the length of the base tube was extended to be 0.9% longer than the initial length. Additionally, an aluminum tube with a thickness of 2.5 mm was used as the base tube.

Roof rail manufacturing according to Experimental Example 2

The roof rail was manufactured by the method described with reference to FIGS. 6 to 9, but in the process of stretching the base tube, the length of the base tube was extended to be 1.3% longer than the initial length. Additionally, an aluminum tube with a thickness of 2.5 mm was used as the base tube.

Roof rail manufacturing according to Experimental Example 3

The roof rail was manufactured by the method described with reference to FIGS. 6 to 9, but in the process of stretching the base tube, the length of the base tube was extended to be 1.54% longer than the initial length. Additionally, an aluminum tube with a thickness of 2.5 mm was used as the base tube.

Roof rail manufacturing according to Experimental Example 4

The roof rail was manufactured by the method described with reference to FIGS. 6 to 9, but in the process of stretching the base tube, the length of the base tube was extended to be 2.2% longer than the initial length. Additionally, an aluminum tube with a thickness of 2.5 mm was used as the base tube.

Roof rail manufacturing according to Experimental Example 5

The roof rail was manufactured by the method described with reference to FIGS. 6 to 9, but in the process of stretching the base tube, the length of the base tube was extended to be 2.52% longer than the initial length. Additionally, an aluminum tube with a thickness of 2.5 mm was used as the base tube.

division Base tube extended length
(% increased length compared to initial length) Experiment example 1 0.9 Experiment example 2 1.3 Experiment example 3 1.54 Experiment example 4 2.2 Experiment example 5 2.52

Figure 22 is a photograph taken of a state in which the base tube is bent during the roof rail manufacturing process according to Experimental Example 1 of the present invention, and Figure 23 is a state in which the base tube is bent during the roof rail manufacturing process according to Experimental Example 2 of the present invention. is a photograph taken, and Figure 24 is a photograph taken of a roof rail manufactured by the roof rail manufacturing method according to Experimental Example 3 of the present invention, and Figure 25 is a photograph of the base tube during the roof rail manufacturing process according to Experimental Example 4 of the present invention. is a photograph of the bent state, Figure 26 is a photograph of the base tube in a bent state during the roof rail manufacturing process according to Experimental Example 5 of the present invention, and Figure 27 is a photograph of defective products generated during the roof rail manufacturing process. These are additional photos, and Figure 28 is additional photos of good quality roof rails.

As can be seen in FIGS. 22 to 26, it was confirmed that defects (buckling and cracks) occurring in the base tube were controlled according to the extended length of the base tube. Specifically, in the case of Experimental Example 1, Experimental Example 2, Experimental Example 4, and Experimental Example 5, it was confirmed that significant buckling and cracking occurred in the base tube. On the other hand, in the case of Experimental Example 3, it was confirmed that an intact roof rail was manufactured because no buckling or cracks occurred in the base tube.

As a result, the extended length of the base tube is controlled to prevent buckling and cracks from occurring in the base tube, but it can be seen that the extended length compared to the initial length has a lower limit of 1.3% and an upper limit of 2.2%.

Above, the present invention has been described in detail using preferred embodiments, but the scope of the present invention is not limited to the specific embodiments and should be interpreted in accordance with the appended claims. Additionally, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

100: mold
200: Curvature measuring unit
210, 220, 230: first to third displacement measurement sensors
300: Monitoring unit
BT: Aluminum extrusion material, base tube
F: fluid
L: Holder
M: module
h: through hole
GV: Groove
PC: Rubber packing
HL: heated
410: upper module
420: lower module
FV: Fluid receiving groove
FL: fluid flow path
510: first module
520: second module

Claims (5)

Pertaining to a device for measuring the curvature of an aluminum extrusion material,
A mold in which the aluminum extrusion material having a curved shape is placed;
a curvature measuring unit disposed adjacent to the aluminum extrusion material disposed on the mold and measuring the curvature of the aluminum extrusion material; and
A curvature measuring device for an aluminum extruded material including a monitoring unit that receives the curvature value of the aluminum extruded material measured through the curvature measuring unit and displays the curvature value of the aluminum extruded material.
According to claim 1,
The curvature measuring unit includes a plurality of displacement measuring sensors,
A curvature measuring device for an aluminum extrusion material, wherein the plurality of displacement measurement sensors each measure a curvature of the aluminum extrusion material by measuring distances to different areas of the aluminum extrusion material.
According to clause 2,
The curvature measuring unit includes first to third displacement measuring sensors,
The first displacement measurement sensor measures the distance to the first area of the aluminum extrusion material,
The second displacement measurement sensor measures the distance between the first area and a second area different from the aluminum extrusion material,
The third displacement measurement sensor is a curvature measuring device for the aluminum extrusion material, including measuring the distance to a third region different from the first region and the second region of the aluminum extrusion material.
According to clause 3,
The first to third displacement measurement sensors are a curvature measuring device for an aluminum extrusion material, including measuring the distance to the aluminum extrusion material through laser irradiation.
According to claim 1,
The aluminum extruded material is a curvature measuring device for aluminum compressed materials including roof rails for vehicles.

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