CN114850321B

CN114850321B - Solebar forming die

Info

Publication number: CN114850321B
Application number: CN202210493475.3A
Authority: CN
Inventors: 郭雷; 朱利民; 仁春林; 徐论意; 吴兆亮; 丁元
Original assignee: Anhui Jianghuai Automobile Group Corp
Current assignee: Anhui Jianghuai Automobile Group Corp
Priority date: 2022-04-26
Filing date: 2022-04-26
Publication date: 2023-02-24
Anticipated expiration: 2042-04-26
Also published as: CN114850321A

Abstract

The invention provides a frame longitudinal beam forming die which comprises a forming male die, a forming female die and a retainer plate positioned in a forming groove of the forming female die, wherein a correction female die is embedded in a forming surface of a variable cross-section initial area at the rear part of a forming longitudinal beam on the forming male die, and a correction male die opposite to the correction male die is embedded in the retainer plate; the correcting female die is provided with a first correcting surface which is concave inwards, the correcting male die is provided with a second correcting surface which protrudes out of the upper surface of the material supporting plate, and the first correcting surface is matched with the second correcting surface. When the variable cross section starting area at the rear part of the longitudinal beam is formed, the ventral surface of the variable cross section starting area at the rear part of the longitudinal beam can be better prevented from generating a local bulge phenomenon through the matching of the first correction surface and the second correction surface, so that the forming quality of the longitudinal beam of the frame can be effectively improved.

Description

Solebar forming die

Technical Field

The invention belongs to the technical field of frame longitudinal beam forming equipment, and particularly relates to a frame longitudinal beam forming die.

Background

The frame longitudinal beam of light truck generally is traditional girder steel 510L, and along with market's demand constantly outstanding to putting in order the car lightweight, the thickness of vehicle longitudinal beam is thinner and thinner more and thinner, by original 6mm gradually to 5mm, 4.5mm, 4mm transition. In order to ensure that the strength of a frame is not reduced, the frame longitudinal beam of a commercial vehicle is increasingly made of girder steel with the brands of 550L and QSTE-650, and the yield strengths of the girder steel and the QSTE-650 can respectively reach 550Mpa and 650Mpa or adopt high-strength steel materials with higher grades.

As shown in fig. 1 to 3, a frame rail of a commercial vehicle is taken as an example, and comprises a ventral surface 11, an upper wing surface 12, a lower wing surface 13, a rail front variable cross-section bending region 14, a rail front equal cross-section bending region 15 and a rail rear variable cross-section starting region 16, wherein the shape is complicated, the used material strength grade is high, the QSTE-650 hot rolled plate is 4.5mm, and the yield strength is 650Mpa. Because of being limited by the great resilience problem of high strength steel, through batch production verification, there are following problems in this solebar forming process: the material in the variable cross section starting area at the rear part of the longitudinal beam is not smooth to flow, so that the ventral surface of the frame longitudinal beam is locally protruded after extrusion, the assembly and riveting of the rear suspension lifting lug support at the position are influenced, and the coaxiality precision of the left lifting lug and the right lifting lug after forced riveting is poor. Therefore, how to optimize the forming mold to avoid local bulging of the ventral surface of the rear variable cross-section starting area of the frame rail becomes a technical problem which needs to be solved by the technical personnel in the field.

Disclosure of Invention

The invention aims to provide a frame longitudinal beam forming die to solve the technical problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

a frame longitudinal beam forming die comprises a forming male die, a forming female die and a retainer plate positioned in a forming groove of the forming female die, wherein a correction female die is embedded in a forming surface of a variable cross-section initial area at the rear part of a forming longitudinal beam on the forming male die, and a correction male die opposite to the correction female die is embedded in the retainer plate; the correcting female die is provided with a first concave correcting surface, the correcting male die is provided with a second correcting surface protruding out of the upper surface of the retainer plate, and the first correcting surface is matched with the second correcting surface.

Preferably, the first correction surface is a spherical surface with a radius of 104.5mm to 154.5mm, and the concave depth of the spherical surface is 1mm to 2mm.

Preferably, the forming molded surface of the forming convex die for forming the front variable cross-section bending area of the longitudinal beam is an inwards concave disc-shaped correcting molded surface, the disc-shaped correcting molded surface comprises a convex die non-correcting surface I, a convex die triangular correcting surface II and a convex die non-correcting surface II which are sequentially connected from left to right, the convex die non-correcting surface I is connected with the convex die triangular correcting surface I through a transition surface I, the convex die triangular correcting surface I is connected with the convex die triangular correcting surface II through a transition surface II, and the convex die triangular correcting surface II is connected with the convex die non-correcting surface II through a transition surface III; the first convex die triangular correction surface and the second convex die triangular correction surface are inclined surfaces which are inclined towards the direction far away from the retainer plate, and the upper end of the second transition surface protrudes out of the forming convex die; and the material supporting plate is provided with a disc-shaped profile matched with the disc-shaped correction profile.

Preferably, the vertical height of the upper end of the second transition surface is 5mm to 7mm.

Preferably, the first transition surface, the second transition surface and the third transition surface are all provided with chamfers.

Preferably, a local avoiding structure is arranged on a forming molded surface, corresponding to the equal-section bending area of the longitudinal beam, of the forming female die, the local avoiding structure comprises a plurality of triangular grooves which are sequentially connected from left to right, two adjacent triangular grooves are connected through a first fillet, and two inclined planes of the triangular grooves are connected through a second fillet.

Preferably, the radius of the circle where the first round angle and the second round angle are located is 45mm to 55mm.

Preferably, the included angle between the two inclined surfaces of the triangular groove is 140 to 160 degrees.

Preferably, a fin structure is arranged on the lower wing surface of the variable cross section starting area at the rear part of the longitudinal beam, and the fin structure comprises an upward inclined first inclined surface section, a convex first arc section, a concave second arc section and a downward inclined second inclined surface section which are sequentially connected from left to right.

Preferably, the correcting female die and the correcting male die are both rectangular structures; the correction female die is detachably connected with the forming male die, and the correction male die is detachably connected with the retainer plate.

The invention has the beneficial effects that:

according to the forming die for the frame longitudinal beam, the forming surface of the forming convex die for forming the variable cross section starting area at the rear part of the longitudinal beam is internally embedded with the correction concave die, the correction convex die opposite to the correction convex die is embedded in the material supporting plate, the correction concave die is provided with the first correction surface which is concave inwards, the correction convex die is provided with the second correction surface which is convex out of the surface of the material supporting plate, and when the forming is carried out, the first correction surface is matched with the second correction surface, so that the problem of local convex of the ventral surface of the variable cross section starting area at the rear part of the longitudinal beam can be well solved, and the forming quality of the frame longitudinal beam is effectively improved.

Drawings

In order to more clearly describe the embodiments of the present application or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and the embodiments of the present invention will be further described in detail with reference to the drawings, wherein

FIG. 1 is an isometric view of a prior art frame rail;

FIG. 2 is a schematic view of a prior art frame rail;

FIG. 3 is another schematic view of a prior art frame rail;

FIG. 4 is a schematic view of a frame rail forming mold according to an embodiment of the present invention;

FIG. 5 is a schematic view of a forming punch according to an embodiment of the invention;

FIG. 6 is another schematic view of a forming punch according to an embodiment of the present invention;

FIG. 7 is an enlarged view taken at A in FIG. 5;

FIG. 8 is an enlarged view at B in FIG. 5;

FIG. 9 is an enlarged view at C of FIG. 6;

FIG. 10 is a schematic view of a correction female die and a correction male die provided in an embodiment of the present invention when the correction female die and the correction male die are not matched;

FIG. 11 is a schematic view of a retainer plate provided in an embodiment of the present invention with a formed frame rail placed thereon;

FIG. 12 is an enlarged view at D of FIG. 11;

fig. 13 is a schematic view of a local avoidance structure provided in an embodiment of the present invention;

FIG. 14 is a schematic view of a frame rail provided in accordance with an embodiment of the present invention;

FIG. 15 is an enlarged view at E in FIG. 14;

fig. 16 is a schematic diagram of a fin structure according to an embodiment of the present invention.

In the drawings, the reference numbers:

11. ventral surface, 12, upper wing surface, 13, lower wing surface, 14, longitudinal beam front part variable cross-section bending area,

15. the equal section bending area at the front part of the longitudinal beam, 16 the variable section initial area at the rear part of the longitudinal beam,

21. a forming male die 22, a correction female die 221, a first correction surface 222, a hexagon socket head cap screw,

231. a first male die non-correction surface 232 and a first male die triangular correction surface,

233. a second convex mould triangular correction surface 234, a second convex mould non-correction surface 235, a first transition surface,

236. a second transition surface 237, a third transition surface 31, a forming concave die 32 and a forming groove,

33. a local avoiding structure 331, a triangular groove 332, a first inclined plane,

333. a second inclined surface 334, a first fillet 335, a second fillet 41, a retainer plate,

42. a correction punch 421, a second correction face 43, a butterfly profile 51, a frame rail,

52. a first slope section 53, a first arc section 54, a second arc section,

55. a second slashface segment, 56, a lower airfoil.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description will be provided with reference to specific embodiments.

As shown in fig. 4 to 16, an embodiment of the present invention provides a vehicle frame longitudinal beam forming mold, which includes a forming male mold 21, a forming female mold 31, and a retainer plate 41 located in a forming groove 32 of the forming female mold, wherein a correction female mold 22 is embedded in a forming surface of the forming male mold 21 for forming a variable cross-section starting area at the rear of a longitudinal beam, and a correction male mold 42 opposite to the correction female mold is embedded in the retainer plate; the correcting female die is provided with a first concave correcting surface 221, the correcting male die is provided with a second correcting surface 421 protruding out of the upper surface of the retainer plate, and the first correcting surface is matched with the second correcting surface.

According to the forming die for the frame longitudinal beam, the correcting female die 22 is embedded in the forming surface of the forming male die for forming the variable cross section starting area at the rear part of the longitudinal beam, the correcting male die 42 opposite to the correcting male die is embedded in the material supporting plate, the correcting female die is provided with the inwards concave first correcting surface, the correcting male die is provided with the second correcting surface protruding out of the surface of the material supporting plate, and during forming, the first correcting surface is matched with the second correcting surface, so that the problem that the ventral surface of the variable cross section starting area at the rear part of the longitudinal beam is locally protruded can be well avoided, and the forming quality of the frame longitudinal beam is effectively improved.

Specifically, the first correction surface 221 is a spherical surface with a radius of 104.5mm to 154.5mm, and the concave depth of the spherical surface is 1mm to 2mm, as shown in fig. 10. It can be understood that the second calibration surface 421 is also a spherical surface, and the height h1 of the projection of the second calibration surface 421 from the upper surface of the retainer plate is 1mm to 2mm; the correcting female die is positioned on the lower surface of the forming male die.

As shown in fig. 8, further, a forming molded surface on the forming male mold 21 for forming a front variable cross-section bending region of the longitudinal beam is an inward concave disc-shaped correcting molded surface, the disc-shaped correcting molded surface includes a first male mold non-correcting surface 231, a first male mold triangular correcting surface 232, a second male mold triangular correcting surface 233 and a second male mold non-correcting surface 234 which are sequentially connected from left to right, the first male mold non-correcting surface is connected with the first male mold triangular correcting surface through a first transition surface 235, the first male mold triangular correcting surface is connected with the second male mold triangular correcting surface through a second transition surface 236, and the second male mold triangular correcting surface is connected with the second male mold non-correcting surface through a third transition surface 237; the first convex die triangular correction surface and the second convex die triangular correction surface are inclined surfaces which are inclined towards the direction far away from the retainer plate, and the upper end of the second transition surface 236 protrudes out of the forming convex die; the retainer plate is provided with a disc-shaped profile 43 which is matched with the disc-shaped correction profile. Because the frame longitudinal beam in the prior art has the phenomenon of excessive distortion in a variable cross-section bending area at the front part of the longitudinal beam during molding, the clearance after the engine is assembled and the coaxiality precision of left and right lifting lugs of a front overhang of a frame are influenced; by adopting the scheme, when the forming is carried out, the disc-shaped correction molded surface is matched with the disc-shaped molded surface, so that the phenomenon that the bending area of the variable cross section of the longitudinal beam is excessively twisted can be well avoided.

The disc-shaped correction surface arranged on the frame longitudinal beam forming die is provided with a first convex die triangular correction surface and a second convex die triangular correction surface, the first convex die triangular correction surface is connected with the second convex die triangular correction surface through a second transition surface, and the lower end of the second transition surface protrudes out of the forming convex die.

Specifically, the vertical height of the protrusion of the upper end of the second transition surface 236 is 5mm to 7mm, and it may be preferable that the vertical height h3 of the protrusion of the upper end of the second transition surface 236 is 6mm from the lower surface of the forming punch, as shown in fig. 9; the first transition surface, the second transition surface and the third transition surface are respectively provided with a chamfer, the length of the chamfer can be preferably 100 mm-150 mm, the length of the chamfer cannot be too large, and otherwise, the correction effect is weakened. The butterfly-shaped correction profile is designed by fully combining the situation that the distortion error values of the longitudinal beams are not linearly distributed, is different from the roughness method of integrally making the profile into an inclined plane in the prior art, and can better solve the problem of the forming distortion of the longitudinal beams.

As shown in fig. 11 to 13, further, a local avoiding structure 33 is disposed on a molding surface of the molding concave die 31 corresponding to the equal-section bending region of the longitudinal beam, the local avoiding structure 33 includes a plurality of triangular grooves 331 connected in sequence from left to right, two adjacent triangular grooves are connected through a first fillet 334, and two inclined surfaces of the triangular grooves are connected through a second fillet 335. Because the frame longitudinal beam in the prior art also has an equal-section bending area at the front part of the longitudinal beam during forming, the upper wing surface and the lower wing surface of the frame longitudinal beam have the problem of uneven wrinkles, and the uneven upper wing surface influences the assembly of a rear support of a cab; by adopting the scheme, the material flow is facilitated through the round corners and the inclined planes, the phenomenon that the upper wing surface and the lower wing surface are not smooth due to the fact that the materials are piled up and extruded when the carframe longitudinal beam is bent in a forming mode is prevented, and therefore the influence on the rear supporting assembly of a cab is avoided.

Specifically, the radius of the circle where the first rounded corner 334 and the second rounded corner 335 are both 45mm to 55mm; the included angle between the two inclined planes of the triangular groove is 140-160 degrees. Preferably, the radius of the circle where the first fillet 334 and the second fillet 335 are both 50mm, and the included angle between the two slopes of the triangular groove, namely the first slope 332 and the second slope 333, is 150 degrees, so that the material flow is facilitated, and the effect of better preventing the upper airfoil surface and the lower airfoil surface from being wrinkled and uneven is achieved; two ends of the local avoiding structure can be respectively connected with the upper surface of the forming female die through a second round angle.

As shown in fig. 14 to 16, a fin structure is further disposed on a lower wing surface 56 of the variable cross-section starting area at the rear portion of the longitudinal beam, and the fin structure includes an upward inclined first slope section 52, a convex first arc section 53, a concave second arc section 54, and a downward inclined second slope section 55, which are sequentially connected from left to right. By adopting the scheme, the material flow of the carframe longitudinal beam during forming and bending is favorably guided through each inclined plane section and each arc section, on one hand, the ventral surface of the carframe longitudinal beam in the area is favorably controlled to be not easy to bulge, on the other hand, the lower wing surface of the carframe longitudinal beam is favorably controlled to be not easy to wrinkle, the torsion error of the carframe longitudinal beam in the area is also controlled after the material is sufficiently flowed, so that the forming quality of the carframe longitudinal beam can be improved, and meanwhile, the fin structure of the lower wing surface of the formed carframe longitudinal beam cannot influence the assembly work of the carframe longitudinal beam on a vehicle.

Preferably, the radius of the circle in which the first circular arc section 53 is located is 10mm, and the radius of the circle in which the second circular arc section 54 is located is 15mm. The length L of the first inclined section may be 80mm and the height h2 may be 7mm.

Specifically, the correcting female die 22 and the correcting male die 42 are both rectangular structures; the correction female die is detachably connected with the forming male die, and the correction male die is detachably connected with the retainer plate. Preferably, the detachable connection is a bolt connection; the correction female die and the correction male die are rectangular blocks, and the spherical surface is gradually abraded in the process of mass production of the frame longitudinal beam, so that the correction female die is a rectangular block and is fixed on the forming male die through 4 hexagon socket head bolts 222, and the maintenance and the replacement are convenient; meanwhile, the correcting male die is designed into a rectangular block and is fixed on the retainer plate through 4 hexagon socket head cap bolts, so that the correcting male die is convenient to maintain, disassemble and replace.

Because the cross-section of longeron rear portion variable cross section initial area's the carframe longeron begins to diminish, and it can appear piling up down the wing material, the local belling protruding problem that appears of ventral surface when leading to the carframe longeron shaping, it is protruding in order to rectify this belling, the first correction face and the convex second that are used for the indent of shaping ventral surface department to set up a pair of looks adaptation on forming die are positive, and positive is corrected to first correction face and second, and be spherical face, so that when the shaping, be about to take place the belling position formation spherical recess in this position of ventral surface, make the carframe longeron take place to kick-back just in time and form the plane after withdrawing from forming die, and it is not protruding. Meanwhile, the fin structure is arranged on the lower airfoil surface, so that the material flow is guided, the material accumulation is reduced, and the bulge problem is relieved.

It can be understood that, like the forming die in the prior art, the forming die also has a base, the forming female die is arranged on the base, the upper side surface of the forming female die defines a processing area for placing the frame rail material sheet, and the forming female die is sunken downwards in the processing area to form the forming groove; the material supporting plate is movably arranged in the forming groove along the vertical direction and is used for upwards supporting the frame longitudinal beam material sheet at the processing area; the forming male die is movably arranged right above the forming groove along the vertical direction, and has a movable stroke of moving downwards to press the frame longitudinal beam material sheet into the forming groove; wherein, the upper surface of the retainer plate is matched with the shape and the size of the lower bottom surface of the forming convex die.

The method can avoid the problem that the shaping process is required to be added due to the defect of the shaping quality of the frame longitudinal beam, improve the shaping precision of the frame longitudinal beam and the consistency of the quality of the vehicle type, and ensure the product quality and the production efficiency of the high-strength steel frame longitudinal beam.

The above are only preferred embodiments of the present invention, it should be noted that these examples are only for illustrating the present invention and are not to be construed as limiting the scope of the present invention, and after reading the contents of the present invention, those skilled in the art can make various changes or modifications to the present invention, which also fall within the scope of the appended claims of the present application.

Claims

1. A frame longitudinal beam forming die is characterized by comprising a forming male die, a forming female die and a retainer plate positioned in a forming groove of the forming female die, wherein a correction female die is embedded in a forming molded surface of a variable cross-section initial area at the rear part of a forming longitudinal beam on the forming male die, and a correction male die opposite to the correction female die is embedded in the retainer plate; the correcting female die is provided with a first concave correcting surface, the correcting male die is provided with a second correcting surface protruding out of the upper surface of the retainer plate, and the first correcting surface is matched with the second correcting surface;

the forming surface of the forming convex die for forming the variable cross-section bending area at the front part of the longitudinal beam is an inwards concave disc-shaped correcting surface, the disc-shaped correcting surface comprises a convex die uncorrecting surface I, a convex die triangular correcting surface II and a convex die uncorrecting surface II which are sequentially connected from left to right, the convex die uncorrecting surface I is connected with the convex die triangular correcting surface I through a transition surface I, the convex die triangular correcting surface I is connected with the convex die triangular correcting surface II through a transition surface II, and the convex die triangular correcting surface II is connected with the convex die uncorrecting surface II through a transition surface III; the first convex die triangular correction surface and the second convex die triangular correction surface are inclined surfaces which are inclined towards the direction far away from the retainer plate, and the upper end of the second transition surface protrudes out of the forming convex die; and the material supporting plate is provided with a disc-shaped profile matched with the disc-shaped correction profile.

2. The vehicle frame rail forming die of claim 1, wherein the first correction surface is a spherical surface with a radius of 104.5mm to 154.5mm, and the concave depth of the spherical surface is 1mm to 2mm.

3. The vehicle frame rail forming die of claim 1, wherein the vertical height of the projection of the upper end of the second transition surface is 5mm to 7mm.

4. The vehicle frame rail forming mold of claim 1, wherein the first transition surface, the second transition surface and the third transition surface are chamfered.

5. The forming die for the frame longitudinal beam according to claim 1, wherein a local avoiding structure is arranged on a forming molded surface of the forming female die corresponding to the uniform-section bending region of the longitudinal beam, the local avoiding structure comprises a plurality of triangular grooves which are sequentially connected from left to right, two adjacent triangular grooves are connected through a first fillet, and two inclined surfaces of each triangular groove are connected through a second fillet.

6. The vehicle frame rail forming die of claim 5, wherein the radius of the circle on which the first fillet and the second fillet are located is 45mm to 55mm.

7. The vehicle frame rail forming die of claim 5, wherein an included angle between two inclined surfaces of the triangular groove is 140 degrees to 160 degrees.

8. The vehicle frame longitudinal beam forming die according to claim 1, wherein a fin structure is arranged on a lower wing surface of a variable cross section starting area at the rear part of the longitudinal beam, and the fin structure comprises an upward inclined first slope section, a convex first arc section, a concave second arc section and a downward inclined second slope section which are sequentially connected from left to right.

9. The vehicle frame longitudinal beam forming die of claim 1, wherein the correcting female die and the correcting male die are both in a rectangular structure; the correcting female die is detachably connected with the forming male die, and the correcting male die is detachably connected with the retainer plate.