JP5412980B2 - Method for manufacturing vehicle frame part and vehicle frame part manufactured thereby - Google Patents

Description

  The present invention relates to a method for manufacturing a vehicle frame part, particularly a vehicle frame part used for an automobile body frame or the like having a closed cross-sectional structure, and a vehicle frame part manufactured thereby.

  For vehicle frame parts with a closed cross-section structure, a closed cross-section structure in which a metal plate is press-molded into a substantially hat shape, the hat-shaped members are butted in opposite directions and the flange portion is joined by spot welding, etc. Closed cross-section parts formed into a target shape by rotating pulling bending or hydroforming using a pipe, or metal plates are formed into a cylindrical shape with a substantially circular or polygonal cross section by roll forming, etc., and the ends of the plates are welded together A part having a closed cross-section structure is used by joining together.

  However, the closed cross-section structure has a problem that when the structural member is elongated in the longitudinal direction, the inside of the closed cross-section is hollow, so that even if a high-strength material is used, the bending rigidity and torsional rigidity of the parts are significantly reduced. There is. As a countermeasure, it is common to install a reinforcing component called a bulkhead in the closed cross-sectional structure as a reinforcing component to compensate for the decrease in rigidity (Fig. 1). It is inserted into the closed cross section so as to constitute a partition wall vertically.

  This reinforcing component is a closed cross-section structural member that welds hat members together. When the hat members are welded together, they need only be installed inside and welded, and are widely used as a relatively simple rigidity improving method. .

  In the case of a closed cross-section structural member having a constant cross-sectional shape, the strength of the member is substantially constant in the longitudinal direction. Therefore, in order to reinforce a specific part of the skeleton member in order to improve the performance of the vehicle body, it is called rain reinforcement. It is common to mount the reinforcing component in the framework member (FIG. 2).

  In this case, a closed cross-section component having a substantially U-shaped cross section as shown in FIG. 2 is often used. Similar to the bulkhead, this reinforcing component may be installed and welded inside the hat members and can be easily applied.

  For parts that have a closed cross-section structure by forming a metal plate into a cylindrical shape with a substantially circular or polygonal cross section by roll forming and joining the ends of the plate by welding, etc. It is difficult to insert and install a hosement.

  Patent Document 1 discloses a method of inserting a reinforcing component into a tubular member having a substantially constant cross-sectional shape to improve the strength of the member, but details of a method of installing the reinforcing component at a predetermined position are described. It has not been.

Japanese Patent No. 3139984

  However, structural parts formed by hydroforming using metal pipes as raw materials, and structural parts formed into cylinders by roll forming using metal plates as raw materials are reinforced such as bulkheads and rain reinforcements. There is a problem that a part cannot be inserted and attached at a predetermined position.

  Further, even if the reinforcing component is inserted from the opening at the end, there is a problem that the reinforcing component cannot be easily and accurately installed at a predetermined position. For this reason, it is not possible to install a reinforcing component inside the structural member as a method for improving rigidity and strength, and development of a method for attaching the reinforcing component to a long component is desired.

  The present invention relates to a method for manufacturing a vehicle frame component suitable for a frame component used in a vehicle frame or the like, and a metal plate is processed into a cylindrical shape having a substantially circular or polygonal cross section by pressing or roll forming. , A method for accurately installing reinforcing parts such as bulkheads and rain reinforcements at predetermined positions inside the parts for a closed cross-section structural part that joins the plate ends together by welding or caulking, etc., and a skeleton manufactured thereby The purpose is to provide parts.

  In order to solve the above problems, the present invention has the following features.

  The first invention is a closed cross-section structural member having a substantially linear shape in the longitudinal direction in which a metal plate is formed into a cylindrical shape having a substantially circular or polygonal cross section, and flange portions provided on the plate end surface or the plate end surface are joined together. After forming the closed cross-section structural member into a shape having a different cross-sectional shape in at least one location in the longitudinal direction, a reinforcing component is inserted from the open end of the closed cross-section structure member, and the cross-section shape is changed to a location different It is a method for manufacturing a vehicle frame part, wherein the reinforcing part is pressed to determine a mounting position of the reinforcing part.

  According to a second aspect of the present invention, when a closed cross-section structural member is used, the metal plate is processed in advance so that the cross-sectional shape is different in at least one portion in the longitudinal direction, and the metal plate is substantially circular. Alternatively, it is molded into a cylindrical shape with a polygonal cross-section, and the flanges provided on the plate end surfaces or the plate end surfaces are joined together. The cross-sectional shape differs at least at one or more locations in the longitudinal direction. The closed cross-section structural member is inserted into the closed cross-section structure member, and the reinforcement component is inserted into the opening end of the closed cross-section structure member, and the reinforcement component is pressed against a portion having a different cross-sectional shape, thereby determining the installation position of the reinforcement component. This is a method for manufacturing a vehicle frame part.

  According to a third aspect of the invention, the metal plate is formed into a substantially circular or polygonal cross-section cylindrical shape, and when the metal plate is a closed cross-section structural member, the cross-sectional shape is different in at least one part in the longitudinal direction. After that, the plate end surfaces or flange portions provided on the plate end surfaces are joined to each other, are substantially linear in the longitudinal direction, and have different cross-sectional shapes in at least one part in the longitudinal direction. The closed cross-section structural member is inserted into the closed cross-section structure member, and the reinforcement component is inserted into the opening end of the closed cross-section structure member, and the reinforcement component is pressed against a portion having a different cross-sectional shape, thereby determining the installation position of the reinforcement component. This is a method for manufacturing a vehicle frame part.

  A fourth invention is a skeleton part for a vehicle manufactured by the manufacturing method according to any one of the first to third inventions.

  A fifth aspect of the present invention is the vehicle framework part according to the fourth aspect of the present invention, wherein the tubular closed surface structure member and the reinforcing part are joined.

  According to the present invention, it is difficult to improve the bending / torsional rigidity of a member or locally improve the strength of a member without being able to insert reinforcing parts such as a conventional bulkhead and rain reinforcement. A reinforcing part is simply inserted into a predetermined position by inserting a reinforcing part into the closed cross-section structure part for a vehicle skeleton formed by forming a metal plate into a cylindrical shape and joining the end parts to each other. Will be able to.

  Further, according to the present invention, it becomes possible to improve the rigidity of the entire skeletal component and locally reinforce the part that requires strength. It can be expected to improve fuel efficiency when applied to automobile frame parts.

It is a figure explaining the method of applying a bulkhead to a closed section structural member. It is a figure explaining the method of applying a rain reinforcement to a closed cross-section structural member. It is a figure which shows the closed cross-section structural member produced by roll molding or press molding. It is a figure which shows the closed cross-section structural member which has a different cross-sectional shape. It is a figure explaining the insertion method 1 of a reinforcement component. It is a figure explaining the insertion method 2 of a reinforcement component. It is a figure explaining the insertion method 3 of a reinforcement component. It is a figure explaining the insertion method 4 of a reinforcement component. It is a figure explaining the torsional rigidity evaluation method. It is a figure explaining a bending rigidity evaluation method. It is a figure explaining the cross-sectional dimension of the member created in the Example. It is a figure explaining the rigidity improvement effect by this invention.

  In general, in the case of a skeletal component that has a closed cross-section structure by butting the hat bending members together and welding the flange part, the bulkhead 1 is inserted into the hat member 2 side of one side as shown in FIG. It is possible to assemble by welding the flange part of the hat members 2 and 3 after welding the part and the wall part of the hat member 2, and closing the lid part with the other hat member 3. The same is true when inserting a reinforcement as shown in FIG.

  On the other hand, as shown in FIG. 3, in the case of the closed cross-section structural member 4 in which a metal plate is formed into a cylindrical shape by roll molding or press molding and the plate ends are joined by welding or the like, The only way to insert reinforcement is through the opening at the end. In such a case, in the case of a cylindrical closed cross-sectional structure having a substantially constant cross-sectional shape, it is difficult to simply install the reinforcing component at a predetermined position.

  In order to solve this problem, as shown in FIG. 4, a cylindrical closed cross-sectional structure having a substantially constant cross-sectional shape in the longitudinal direction is formed by changing the cross-sectional shape of a part where a reinforcing component is to be installed. The method to do is effective. In the case of FIG. 4, the cross-sectional shape (peripheral length) of the closed cross-sectional structure is changed in the middle of the longitudinal direction. Molding that changes the cross-sectional shape in the middle of the longitudinal direction may be performed at any of the following three types.

(1) After forming a closed cross-section structural member (after forming into a cylindrical shape and joining the end portions)
(2) Before forming the metal plate into a cylindrical shape (after processing the metal plate into a predetermined shape in advance and processing it into a cylindrical shape, end joining)
(3) Reinforcing parts processed into a substantially same shape as a closed cross-section structural member as shown in FIG. 5 during or after molding and before end joining before forming the metal plate into a cylindrical shape 7 and 8 are inserted through the openings, the reinforcing parts 7 and 8 stop at the portion where the cross-sectional shape of the closed cross-section structural member 6 has changed, so that the reinforcing parts 7 and 8 can be installed at predetermined positions. Thus, the reinforcing parts 7 and 8 can be easily installed at predetermined positions without using complicated positioning jigs and mechanisms.

  In particular, in the case of the reinforcing parts 7 and 8 having the shape shown in FIG. 5, the distal ends of the reinforcing parts 7 and 8 in the insertion direction are smaller than the cross-sectional dimensions of the closed cross-section structural member 6 on the insertion side. When inserting the reinforcing parts 7 and 8 into the opening, the work is easy and desirable because there is little interference with the closed cross-section structural member 6.

  Similarly, a method of locally changing the cross-sectional shape by providing the protrusion 16 on the side wall of the cylindrical closed cross-section structural member 9 having a substantially constant shape as shown in FIG. 6 is also effective. The protrusion 16 may be applied to the metal plate before being formed into a cylindrical shape, or may be applied after being formed into a cylindrical shape to form a closed cross-section structural member. In this case, since the reinforcing component inserted from the end portion comes into contact with the protruding portion 16 and stops, the reinforcing component 10 can be easily installed at a predetermined position. The processing method of the protrusion 16 may be normal press processing using a mold, and the effect of the invention does not depend on the processing method. The number of protrusions 16 is not limited to one, and may be plural.

  Similarly, a method of locally changing the cross-sectional shape by providing notches 17 and end slits 19 on the side wall of the cylindrical closed cross-section structural member 11 having a substantially constant shape as shown in FIGS. It is. The cuts 17 and the end slits 19 may be provided on the metal plate before being formed into a cylindrical shape, or may be provided after being formed into a cylindrical shape to form a closed cross-section structural member.

  In this case, the fixing claws 18 and 20 are manufactured in the reinforcing component 12 so as to correspond to the positions of the notches 17 and the end slits 19, and the reinforcing nails 18 or 20 of the reinforcing components inserted from the end portions are cut. It is possible to easily install the reinforcing parts 12 and 14 at predetermined positions by inserting them into 17 or the end slits 19.

  The cutting method of the notches 17 and the end slits 19 may be punching, and the effect of the invention is not dependent on the processing method. The number of the cuts 17 and the end slits 19 is not limited to one, and may be plural.

  Reinforcing parts can be used as the reinforcement shown in FIG. 2 if they are cylindrical parts that are open at both ends. If they are cup-shaped parts that are closed at either end (manufactured by drawing, etc.) Since the partition wall can be configured by being installed inside the closed cross-section structural member, it can be used as the bulkhead shown in FIG.

  Here, the invention has been described by taking a closed cross-section structural member having a hexagonal cross-section as an example. However, the effect of the present invention is not limited to the cross-sectional shape, and the cross-sectional shape may be a substantially circular shape or other polygonal shapes. Good.

  Further, it is expected that the rigidity and strength of the member are further improved by joining the inserted reinforcing component and the cylindrical closed cross-section member main body. Although any joining method can be expected to improve rigidity and strength, it is simple and desirable to use methods such as spot welding, laser welding, and arc welding in view of productivity. Since a spot welding gun does not enter due to the closed cross-sectional structure, a one-side spot welding method may be used in the case of spot welding. In the case of arc welding, if a hole for welding is made in the side wall of the closed cross-section member where the reinforcing component is installed, welding with the internal reinforcing component is possible.

  A closed cross-sectional structure in which hat members are overlapped as shown in FIG. 11 and a hexagonal cross-sectional closed cross-sectional structure were manufactured by bending by press molding. In order to compare the effects, the cross-sectional lengths were adjusted to substantially the same length. The length in the longitudinal direction of the closed cross-section structural component was 800 mm. A cold-rolled steel sheet having a thickness of 1.4 mm and a tensile strength of 590 MPa was used as the material. The flange part of the hat member was joined by spot welding, and the structural members having a hexagonal cross section were joined to each other by laser welding.

  In order to apply the present invention, a hexagonal cross-section structural member has (1) a member whose cross-sectional dimensions are gradually changed over a range of 25 mm in the longitudinal direction at the center in the longitudinal direction, and (2) a constant cross-sectional dimension in the longitudinal direction. The metal plate was formed into a cylindrical shape by press working, and the plate end portions were produced by laser welding.

  The member (1) was processed so that the cross-sectional shape in the region about half in the longitudinal direction after laser welding was about 1% larger in both the vertical and horizontal directions than the cross-sectional dimension shown in FIG. In the member (2), cuts for fixing the reinforcing parts were processed at four locations on the side wall in the center in the longitudinal direction.

The reinforcing part for hexagonal cross-section structural member (1) is manufactured according to the cross-sectional dimensions of the hexagonal cross-section structural member, the section where the cross-sectional shape changes is 25 mm, the other sections are 25 mm, The cup shape had a hexagonal cross section of about 50 mm. Also,
The reinforcing component for the hexagonal cross-section structural member of (2) is manufactured according to the cross-sectional dimension of the hexagonal cross-section structural member, is formed into a cup shape having a hexagonal cross section of about 50 mm in height direction, According to the cutting position, fixing nails were provided at four locations. Therefore, since the cup-shaped bottom functions as a partition wall, the cup-shaped bottom functions as a bulkhead by being inserted into the hexagonal cross-section structural member.

  In the case of the member of (1), the reinforcing component was inserted from the opening end portion on the side having a larger cross-sectional dimension, abutted against the site where the cross-sectional dimension changes, and the installation site was determined and attached. In the case of the member of (2), the reinforcement part was inserted from the opening end, and the installation part was determined and attached by inserting the claw for fixing the reinforcement part into the notch of the hexagonal cross-section structural member. The inserted reinforcing component and hexagonal closed cross-section structural member were welded all around by laser welding.

  With respect to the torsional rigidity of the part, as shown in FIG. 9, one end of the member was completely fixed, a torsional moment was applied to the opposite end, the torsion angle of the part was measured, and the torsional rigidity was measured. As for the bending rigidity of the parts, as shown in FIG. 10, one end of the member is completely fixed, a load is applied to the opposite end (cantilever type), and the amount of displacement at the load load position is measured. The bending stiffness was measured.

FIG. 12 shows the measurement results of bending rigidity and torsional rigidity. Comparative example 1: Close cross-section structural member in which hat members are overlapped and joined ○ Comparative example 2: Bulk head is installed inside closed cross-section structural member in which hat members are overlapped and joined ○ Comparative example 3: Hexagonal cross section Closed-section structural member (no reinforcing parts)
Inventive Example 1: Reinforcing parts (bulkhead) according to the present invention inserted into a hexagonal cross-section structural member of (1). Inventive Example 2: (2) hexagonal cross-section closed-section structural member. Fig. 5 shows a case where a reinforcing component (bulkhead) according to the present invention is inserted. The effect was compared with the rigidity value of Comparative Example 1 as 100%.

  Bending rigidity and torsional rigidity can be improved by inserting a bulkhead into a closed cross-section structural member in which normal hat members are joined as in Comparative Example 2, but the closed cross-section structural member has a hexagonal cross-sectional shape in the same manner. It was confirmed that bending rigidity and torsional rigidity were improved by applying the present invention to the above. Even in the case of a closed cross-section structural member, it has been found that by inserting the bulkhead from the end and installing it at a predetermined position, the component function can be improved in the same manner as in the case of the hat member.

1: Bulk head 2: Hat member (bulk head insertion side)
3: Hat member (lid side)
4: Reinforcement 5: Closed cross-section structural member 6 having a hexagonal cross-sectional shape 6: Closed cross-section structural member 7 having a different hexagonal cross-sectional shape 7: Reinforcement component 1
8: Reinforcement part 2
9: Closed cross-section structural member 10 having a hexagonal cross-sectional shape with a protrusion shape on the side wall 10: Reinforcing component 3
11: Closed cross-section structural member having a hexagonal cross-sectional shape with a cut in the side wall 12: Reinforcing component 4
13: Closed cross-section structural member having a hexagonal cross-sectional shape with end slits provided on the side wall 14: Reinforcing component 5
15: Welding position 16: Protrusion 17: Cut 18: Claw for fixing the reinforcing part 4 19: End slit 20: Claw for fixing the reinforcing part 5

Claims (5)

A metal plate is formed into a cylindrical shape having a substantially circular or polygonal cross section, and a closed cross-section structural member having a substantially linear shape in a longitudinal direction in which flange portions provided on the plate end faces or the plate end faces are joined to each other , When inserting a reinforcing component that improves the bending rigidity or torsional rigidity of the bulkhead or reinforcement , the cross-sectional shape of the closed cross-section structural member is changed at least at one or more locations in the longitudinal direction . Or after forming a shape to insert a fixing claw manufactured in the reinforcing part by providing a slit in the side wall of the closed cross-section structural member or by providing a slit in the end of the closed cross-section structural member the inserting the reinforcing component from the open end of the closed cross section member, at a portion where the cross-sectional shape different, or, in the cut portion, or the slit portion, before By pressing the reinforcing component, the attached decide the mounting position of the reinforcing component, the closed cross section method of manufacturing a vehicle frame components, characterized in that to improve the rigidity of the member. The closed section structural member Upon inserting a reinforcing component for improving the flexural rigidity or torsional rigidity of the bulkhead or reinforcement, in the longitudinal direction of the at least one location or more sites upon said closed section structural member, the closed The cross-sectional shape of the cross-section structural member is changed, or the side wall of the closed cross-section structure member is cut, or the end of the closed cross-section structure member is slit and the fixed part manufactured on the reinforcing part The metal plate is processed in advance so that it has a shape for inserting a claw , and the metal plate is formed into a substantially circular or polygonal cylindrical shape, and the flange portions provided on the plate end surface or the plate end surface are joined to each other. It stands straight in the longitudinal direction and in the longitudinal direction of the at least one location or more sites, or to change the cross-sectional shape of the closed section structural member, or, in the side wall of said closed-section structural member Or confer write, or a closed section structural member having a shape to insert the lock bar fabricated in the reinforcing component by applying a slit on the end of the closed section structural member, the open end of the closed cross section member the insert reinforcing parts from parts, at a site where the cross-sectional shape different, or, in the cut portion, or the slit portion, by pressing the reinforcing component, decide the mounting position of the reinforcing component A method for manufacturing a vehicle skeleton part , wherein the rigidity of the closed cross-section structural member is improved . In order to insert a reinforcing component for improving the bending rigidity or torsional rigidity of the bulkhead or reinforcement in the closed cross-section structural member, the metal plate is formed into a substantially circular or polygonal cross-section cylinder, and the metal plate is closed. When the cross-sectional structure member is used , the cross-sectional shape of the closed cross-section structure member is changed in at least one part in the longitudinal direction , or a cut is given to the side wall of the closed cross-section structure member, or A slit is provided at the end of the closed cross-section structural member so that a fixing claw manufactured on the reinforcing part is inserted , and then the plate end surface or the flange portions provided on the plate end surface are joined together. It stands straight in the longitudinal direction and in the longitudinal direction of the at least one location or more sites, or to change the cross-sectional shape of the closed section structural member, or, the closed cross section Or grant cuts on the side wall of the timber, or, as the closed section structural member having a shape to insert the lock bar fabricated in the reinforcing component by applying a slit on the end of the closed section structural member, the closed section inserting the reinforcing component from the open end of the structural member, at a portion where the cross-sectional shape different, or, in the cut portion, or the slit portion, by pressing the reinforcing component, the reinforcing component A method for manufacturing a skeletal component for a vehicle , wherein the rigidity of the closed cross-section structural member is improved by determining an attachment position.   A vehicle frame part manufactured by the manufacturing method according to any one of claims 1 to 3. The vehicle frame components according to claim 4, wherein the reinforcing component and the tubular closed cross section structure member is joined.

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