Variable-section crossbeam for truck spare tire rack and manufacturing method thereof
By designing a truck spare tire rack, a cross -section beam is used to use the combined structure of the standing board, the upper folding board and the lower folding board to solve the problem of large weight and high cost of traditional corner steel beams. Effect.
Patent Information
- Application Number
- CN202111206329.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-10-16
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2041-10-16
AI Technical Summary
The angle steel beams of existing truck spare tire frames are heavy and costly, and the material consumption has not been reduced, so the processing cost has increased.
The design of a truck spare tire can be used for the cross -section beam, which is composed of vertical settings, upper and folding boards, and lower folding boards. It is made of stamping and bending process to achieve the optimization of the cross -section shape and the saving of materials.
The variable cross-section beam is light in weight and low in cost, saves raw materials, reduces production and manufacturing costs, and is superior to the bending section modulus of traditional angle steel beams.
Smart Images
Figure CN113895526B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a sheet metal part for a truck, in particular to a variable-section cross beam for a truck spare tire rack and a manufacturing method thereof. Background Art
[0002] Usually, a spare tire is hung on the rear of the frame of various types of cargo trucks. The spare tire is fixed on the spare tire rack. The spare tire rack consists of a lifting mechanism and two angle steel beams. Each angle steel beam is a simply supported beam, and the load is located in the middle of the crossbeam. The angle steel beam is usually made of ordinary hot-rolled equal-section angle steel. In some angle steel beams, the two ends of the equal-section angle steel are cut into bevels to reduce some weight. The two sides of ordinary hot-rolled equal-section angle steel are relatively thick, and the cross-sectional shape of the angle steel beam does not change according to the bending moment distribution, so the weight is naturally large, making it difficult to reduce the cost; also for the purpose of weight reduction, there are L-shaped equal-section angle steel beams stamped from high-strength steel, which reduce part of the weight by reducing the thickness of the plate, but the thinner plate will cause the edge of the L-shaped angle steel beam to become unstable, and the cross-sectional shape of the angle steel beam does not change according to the bending moment distribution, and there is still excess excess material; the method of beveling the two ends can partially change the bending section modulus of the angle steel beam to make it close to the bending moment distribution, and can also achieve a certain weight reduction purpose, but the material consumption has not decreased, and the cost has not decreased. The processing cost has also increased due to the additional cutting process. Summary of the invention
[0003] The purpose of the present invention is to provide a variable-section crossbeam for a truck spare tire rack and a manufacturing method thereof. The variable-section crossbeam can replace a traditional angle steel beam and has the characteristics of light weight, low cost and saving raw materials.
[0004] The first technical solution of the present invention is: a variable-section cross-beam for a spare tire rack of a truck has a vertically arranged vertical plate with a horizontal long side, an upper folding plate bent horizontally toward the side of the vertical plate is provided on the long side of the upper end of the vertical plate, and a lower folding plate bent horizontally toward the side of the vertical plate is provided on the long side of the lower end of the vertical plate, and the upper and lower folding plates are on the same side of the vertical plate; wherein the horizontal side of the upper folding plate is convex relative to the vertical surface of the vertical plate, and the horizontal side of the lower folding plate is concave relative to the vertical surface of the vertical plate; the convex horizontal side of the upper folding plate or the concave horizontal side of the lower folding plate is an axially symmetrical figure about the perpendicular midline of the long side of the vertical plate; and a cross-beam mounting hole is provided at each end of the lower folding plate.
[0005] Based on the variable cross-section beam for the truck spare tire rack described in the technical solution 1, the technical solution 2 of the present invention is:
[0006] The shape of the upper folding plate transverse side is the same as that of the lower folding plate transverse side.
[0007] Based on the variable cross-section beam for the truck spare tire rack described in the technical solution 1, the technical solution 3 of the present invention is:
[0008] The middle width of the upper folding plate is equal to the middle width of the lower folding plate.
[0009] Based on the variable cross-section beam for the truck spare tire rack described in the technical solution one, the technical solution four of the present invention is:
[0010] There are two lifting mechanism mounting holes in the middle of the vertical plate, and the diameter of the holes is 17.5 mm.
[0011] Based on the variable cross-section beam for the truck spare tire rack described in the technical solution 1, the technical solution 5 of the present invention is:
[0012] The diameter of the crossbeam mounting hole of the lower folding plate is 14mm; the thickness of the vertical plate, upper folding plate and lower folding plate is 3.75mm, the length of the vertical plate is 820mm, the height of the vertical plate is 63mm, the middle width of the upper folding plate and the middle width of the lower folding plate are 39mm, the width at both ends of the upper folding plate is 12mm, and the width at both ends of the lower folding plate is 66mm.
[0013] The method for manufacturing the variable cross-section beam for the truck spare tire rack according to the first technical solution is characterized by comprising the following steps:
[0014] 1) Leveling: Use a leveling machine to select a roll with a width equal to the length of the vertical plate, and continuously feed one end of the roll into the leveling machine for leveling to obtain the leveled plate;
[0015] 2) Punching and cutting waste heads: Punching dies and cutting dies are installed on the stamping machine. The leveled sheet is fed into the stamping machine and passed through the punching die. When the sheet end exceeds a certain length of all the cutting edges of the cutting die, the feeding is stopped and the stamping machine is started. The punching die and the cutting die move downward synchronously. The punching die punches out the installation holes of the lifting mechanism and the installation holes of the crossbeam for the first time. The cutting die cuts off the waste head and also cuts out the concave lower folding plate horizontal edge of the first sheet in a separate cutting manner with the same cutting edge;
[0016] 3) Punching and cutting sheets: Feed the sheet material with the lifting mechanism mounting holes and beam mounting holes punched out for the first time and the waste head cut off into the die for a certain distance, then stop feeding, start the stamping machine again, the punching die and the cutting die move downward synchronously, the punching die punches out the lifting mechanism mounting holes and beam mounting holes again, and the cutting die cuts off the first sheet material with the lifting mechanism mounting holes, beam mounting holes, the concave lower folding plate horizontal edge punched out for the first time and the convex upper folding plate horizontal edge punched out this time in the same cutting edge separation cutting method; the convex upper folding plate horizontal edge has the same shape as the concave lower folding plate horizontal edge; each of the following steps is to feed the sheet material into the die of the stamping machine in a stepping manner according to the distance obtained for the first sheet material, and the feeding and cutting cycle is carried out, and one sheet material is obtained in each cycle;
[0017] 4) Press forming: Using a press bending device equipped with a press bending die, place the sheet into the press bending die for positioning. After positioning, the height bisecting line of the vertical plate of the sheet coincides with the center line of the press bending die. The position of the height bisecting line of the vertical plate is obtained by relying on equal distances. Start the press bending device, and the press bending die bends the sheet to form a finished product with a vertical plate, an upper folding plate at the upper end of the vertical plate, and a lower folding plate at the lower end of the vertical plate, and the middle width of the upper folding plate is equal to the middle width of the lower folding plate. The upper and lower folding plates are located on the same side of the vertical plate.
[0018] The advantages of the present invention are as follows: Based on the convex and concave changes of the horizontal sides of the upper and lower folding plates, the sequentially connected upper folding plate, vertical plate, and lower folding plate form a channel-shaped variable cross-section crossbeam. The upper and lower folding plates are obtained by bending and forming. The end of the variable cross-section crossbeam is in an L shape, and the middle is in a C shape. The cross-section of the crossbeam from the end to the middle is a continuously changing transition cross-section, belonging to a specific variable cross-section structure. Compared with the traditional angle steel beam, the distribution law of the bending moment of inertia of the variable cross-section crossbeam (hereinafter referred to as the variable cross-section crossbeam) for the truck spare tire carrier in this application is similar to the bending moment distribution law of the angle steel beam with a uniformly distributed load in the middle, similar to an equal-strength beam, making the best use of materials, having the remarkable feature of saving raw materials, being more economical and reasonable, and can replace the traditional angle steel beam; moreover, due to the adoption of the variable cross-section structure for the variable cross-section crossbeam in this application, in the sheet metal blanking layout, seamless splicing can be achieved between adjacent sheet metal developed parts of the variable cross-section crossbeam in this application. Then, by using a coil material with the same width as the length of the variable cross-section crossbeam for blanking by punching, the concave and convex edges of adjacent two sheet metal parts can be punched out in one cut, enabling zero waste in the blanking process, reasonably utilizing the material, so that the variable cross-section crossbeam not only has the beneficial effect of light weight but also significantly reduces the surplus material and the material cost under the premise of meeting the strength and stiffness requirements, resulting in a significant reduction in the production and manufacturing cost.
[0019] The upper and lower folding plates with the same middle width can make the middle of the variable cross-section crossbeam have a C-shaped cross-section with the same upper and lower widths, which can effectively enhance the bending moment of inertia in the middle of the variable cross-section crossbeam without causing overuse of the sheet material.
[0020] The defined dimensions are used for the commercial protection of the products in this application. Taking the angle steel beam of a domestic brand freight truck as an example, it is made of an equilateral hot-rolled national standard angle steel with a length of 820 mm, 63 mm×63 mm×6 mm, with a unit weight of 5.721 kg / m, a weight of 4.691 kg per piece. After subtracting 0.036 kg for 4 holes, the net weight is 4.655 kg, and its middle bending moment of inertia is 6.0 cm 3The variable cross-section beam described in the aforementioned technical solutions 4 and 5 in this application uses steel with the same material grade as the aforementioned angle steel beam, and its length and height are the same as the aforementioned angle steel beam, but the thickness of the plate used is 3.75mm. After deducting 4 holes with the same diameter as the angle steel beam, the net weight is 3.083kg, which is 1.572kg less than the angle steel beam, and the weight reduction ratio is 33.8%. The variable cross-section beam of this application has a bending section modulus of 4.89cm at both ends. 3 The middle bending section modulus is as high as 9.12cm 3 , exceeding the technical requirements of the main engine manufacturer and better than the technical parameters of the angle steel beam.
[0021] The variable cross-section beam is obtained by rolling a plate through two processes of leveling, punching, cutting, and pressing to obtain a finished product. The manufacturing process is simple, the production efficiency is improved, and the labor cost and manufacturing cost are reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 The present invention is a schematic structural diagram of a variable cross-section beam for a truck spare tire rack.
[0023] Figure 2 The diagram is a top view of the structure of a variable cross-section beam for a truck spare tire rack according to the present invention.
[0024] Figure 3 The present invention is a front view structural schematic diagram of a variable cross-section beam for a truck spare tire rack.
[0025] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure of each section.
[0026] Figure 5 yes Figure 3 Schematic diagram of the flexural section modulus distribution of each section.
[0027] Figure 6 The utility model is a schematic diagram of the variable cross-section beam for the spare tire rack of a truck according to the present invention.
[0028] Figure 7 This is a schematic diagram of the bending moment distribution of a steel beam with uniform load in the middle.
[0029] Figure 8 The diagram is a schematic diagram of the outer contour structure of a variable cross-section beam for a truck spare tire rack according to the present invention.
[0030] Fig. 9 It is a schematic diagram of the sheet production process and equipment for manufacturing variable-section crossbeams for truck spare tire racks.
[0031] Fig.10 It is a schematic diagram of the layout of coil leveling, punching and cutting.
[0032] Fig.11It is a structural diagram of the press bending equipment and the mold.
[0033] Fig.12 It is a schematic diagram of the U-shaped position of the blank.
[0034] Fig.13 It is a schematic diagram of the main structure of the angle steel beam.
[0035] Fig.14 yes Fig.13 FF section view of the angle steel beam.
[0036] Fig.15 is with Figure 3 Schematic diagram of the bending section modulus of the angle steel beam corresponding to each cross-section position of the variable-section beam.
[0037] Fig.16 The utility model is a front view structural schematic diagram of a variable cross-section beam for a truck spare tire rack, in which the upper end of a vertical plate and an upper folding plate are arched.
[0038] In the figure, 1 vertical plate, 2 upper folding plate, 3 lower folding plate, 4 upper folding plate horizontal side, 5 lower folding plate horizontal side, 6 lifting mechanism mounting hole, 7 beam mounting hole, 8 vertical midline of long side of vertical plate, 9 width of both ends of upper folding plate, 10 width of both ends of lower folding plate, 11 middle width of upper folding plate, 12 middle width of lower folding plate, 13 frame, 14 force direction, 15 lifting mechanism, 16 upper right longitudinal side, 17 right vertical side, 18 lower right longitudinal side, 19 lower left longitudinal side, 20 left vertical side, 21 upper left longitudinal side, 22 rolling plate, 23 leveling machine, 24 sheet material after leveling, 25 stamping machine, 26 punching die, 27 cutting die, 28 material sheet, 29 scrap head, 30 bending equipment, 31 bending die, 32 finished product, 33 angle steel beam, 34 outer side surface of vertical plate, 35 center line of bending die, 36 vertical plate height bisector auxiliary line, 37 vertical plate height bisector auxiliary line to the maximum distance from the upper folding plate horizontal side, 38 vertical plate height bisector auxiliary line to the minimum distance from the lower folding plate horizontal side, 39 second embodiment vertical plate, 40 second embodiment upper folding plate. DETAILED DESCRIPTION
[0039] like Figures 1 to 4 As shown, a variable-section crossbeam for a spare tire rack of a truck is characterized in that: it has a vertically arranged upright plate 1 with a horizontal long side, an upper folding plate 2 bent laterally toward the side of the upright plate is provided on the long side of the upper end of the upright plate, and a lower folding plate 3 bent laterally toward the side of the upright plate is provided on the long side of the lower end of the upright plate, and the upper and lower folding plates are on the same side of the upright plate; wherein, the upper folding plate horizontal side 4 is convex relative to the vertical surface of the upright plate, and the lower folding plate horizontal side 5 is concave relative to the vertical surface of the upright plate, and the convex upper folding plate horizontal side 4 or the concave lower folding plate horizontal side 5 are axially symmetrical figures about the mid-perpendicular line 8 of the long side of the upright plate; and a crossbeam mounting hole is provided at each end of the lower folding plate.
[0040] Based on the variable cross-section beam for the truck spare tire rack described in the technical solution 1, the technical solution 2 of the present invention is:
[0041] The upper folding plate transverse side 4 and the lower folding plate transverse side 5 have the same shape.
[0042] Based on the variable cross-section beam for the truck spare tire rack described in the technical solution 1, the technical solution 3 of the present invention is:
[0043] The middle width 11 of the upper folding plate is equal to the middle width 12 of the lower folding plate.
[0044] Since a piece of sheet material is bent into the vertical plate, the upper folding plate and the lower folding plate, their thicknesses are equal and can be a certain value between 3 and 4.5 mm. The length of the vertical plate is a certain value between 650 and 850 mm, the height of the vertical plate is a certain value between 50 and 70 mm, the width 9 at both ends of the upper folding plate is a certain value between a plate thickness (3 to 4.5 mm) and 20 mm, the middle width 11 of the upper folding plate is a certain value between 30 and 45 mm, the width 10 at both ends of the lower folding plate is a certain value between 50 and 70 mm, and the middle width 12 of the lower folding plate is a certain value between 30 and 45 mm.
[0045] A lifting mechanism mounting hole 6 is provided in the middle of the vertical plate; the number of the lifting mechanism mounting holes in this embodiment is two, and the diameter of the hole is 17.5 mm, the number of the beam mounting holes 7 at each end of the lower folding plate is one, and the diameter of each beam mounting hole is 14 mm; the thickness of the vertical plate, the upper folding plate, and the lower folding plate are all 3.75 mm, the length of the vertical plate is 820 mm, the height of the vertical plate is 63 mm, the middle width 11 of the upper folding plate and the middle width 12 of the lower folding plate are both 39 mm, the widths of both ends of the upper folding plate are both 12 mm, and the widths of both ends of the lower folding plate are both 66 mm. These dimensions are calculated by the inventor based on Figure 7 The bending moment distribution law of the angle steel beam of the spare tire rack of a truck with uniform load in the middle and the variable cross-section beam on the frame are shown in the figure. Figure 6 Designed for use. Figures 3 to 5 As shown in the figure, the special variable cross-section beam structure of this embodiment has a bending section modulus that gradually increases from both ends to the middle, and the bending section modulus at the end is 4.89 cm 3 , to the middle auxiliary line FF of the variable cross-section beam (the middle auxiliary line is the bisector of the length of the variable cross-section beam), the bending section modulus is as high as 9.12cm 3 , far superior to Figures 13 to 15 The bending section modulus of the angle steel beam 33 is shown. In the actual processing and manufacturing of the present application, according to the industry practice, the absolute values of the dimensions are all provided with a reasonable range of processing tolerance values.
[0046] like Figure 6As shown, the truck spare tire rack using the variable cross-section beam of the present application is composed of a lifting mechanism 15 and two variable cross-section beams. The two ends of the two variable cross-section beams are fixedly connected to the frame 13 through threaded connectors, and the lifting mechanism placed in the middle between the two variable cross-section beams is fixedly connected to the two variable cross-section beams; the two variable cross-section beams are mainly used to support the lifting mechanism and fix the spare tire through the lifting mechanism, and the lifting mechanism and the weight of the spare tire are vertically transmitted to the two variable cross-section beams, and the force direction is as shown in 14.
[0047] The lifting mechanism 15 can also be welded on two variable-section cross beams, which is simpler and more secure than the threaded connection.
[0048] like Figure 8 As shown, the structure of the variable-section crossbeam of the present application is further limited as follows: a variable-section crossbeam for a spare tire rack of a truck, which has a sheet metal part formed by stamping, which is different from the previous angle steel beam structure in that: the outer edge contour of the sheet metal part has an outward convex upper folding plate horizontal edge 4, an upper right longitudinal edge 16, a right vertical edge 17, a lower right longitudinal edge 18, an inward concave lower folding plate horizontal edge 5, a lower left longitudinal edge 19, a left vertical edge 20, and an upper left longitudinal edge 21 connected in sequence; the upper left longitudinal edge is connected to the outward convex upper folding plate horizontal edge; the outward convex upper folding plate horizontal edge and the inward concave lower folding plate horizontal edge have the same shape; the right vertical edge is perpendicular to both the upper right longitudinal edge and the lower right longitudinal edge; the left vertical edge is perpendicular to both the upper left longitudinal edge and the lower left longitudinal edge; the left and right upper The lengths of the longitudinal sides are the same; the lengths of the left and right lower longitudinal sides are the same; the length dimensions of the left and right upper longitudinal sides are shorter than the length dimensions of the left and right lower longitudinal sides; the sheet metal part comprises an upper folding plate formed by an upper left longitudinal side, an outwardly convex upper folding plate transverse side, and an upper right longitudinal side; a vertical plate formed by a left vertical side and a right vertical side; a lower folding plate formed by a left lower longitudinal side, an inwardly concave lower folding plate transverse side, and a right lower longitudinal side; the upper end of the vertical plate is connected to the upper folding plate, and the lower end of the vertical plate is connected to the lower folding plate; further, if the variable cross-section beam of the present application is connected to the lifting mechanism by assembly, a lifting mechanism mounting hole is provided in the middle of the vertical plate; if the variable cross-section beam of the present application is connected to the lifting mechanism by welding, it is not necessary to process the lifting mechanism mounting hole.
[0049] like Figures 2 to 4 As shown, the width of the upper folding plate refers to: the vertical distance from any point on the convex upper folding plate horizontal edge 4 to the outer side surface 34 of the vertical plate; the width of the lower folding plate refers to: the vertical distance from any point on the concave lower folding plate horizontal edge 5 to the outer side surface 34 of the vertical plate.
[0050] A second embodiment of a variable cross-section beam for a truck spare tire rack is as follows: Fig.16 As shown, the upper end of the second embodiment upright plate 39 and the second embodiment upper folding plate 40 are arched, while other shapes and positions remain unchanged.
[0051] Method for manufacturing variable cross-section beam for truck spare tire rack, such as Figures 9 to 12 As shown, it includes the following steps:
[0052] 1) Leveling: Use a leveling machine to select a rolled plate 22 with a width equal to the length of the vertical plate, and continuously feed one end of the rolled plate 22 into the leveling machine 23 for leveling to obtain a leveled plate 24;
[0053] 2) Punching and cutting waste head: The punching die 26 and the cutting die 27 are installed on the punching machine 25. The leveled sheet material is fed into the punching machine and passed through the punching die. When the sheet material end exceeds a certain length of all the cutting edges of the cutting die, the feeding is stopped, the punching machine is started, and the punching die and the cutting die move downward synchronously. The punching die punches out the lifting mechanism mounting hole 6 and the beam mounting hole 7 for the first time. The cutting die cuts off the waste head 29 and also cuts out the concave lower folding plate horizontal edge 5 of the first piece 28 in a separate cutting manner with the same cutting edge;
[0054] 3) Punching and cutting: Feed the sheet material with the lifting mechanism mounting hole 6, the beam mounting hole 7 and the waste head 29 cut off for the first time into the die for a certain distance, then stop feeding, start the punching machine 25 again, the punching die and the cutting die move downward synchronously, the punching die punches out the lifting mechanism mounting hole 6 and the beam mounting hole 7 again, and the cutting die cuts off the first sheet material 28 with the lifting mechanism mounting hole 6, the beam mounting hole 7, the concave lower folding plate horizontal edge 5 punched out for the first time and the convex upper folding plate horizontal edge 4 punched out this time in the same cutting edge separation cutting method; the convex upper folding plate horizontal edge has the same shape as the concave lower folding plate horizontal edge; each of the following steps is to feed the sheet material into the die of the punching machine in a stepping manner according to the distance of obtaining the first sheet material, and the feeding and cutting cycle is carried out, and one sheet material is obtained in each cycle;
[0055] 4) Pressing: Use a press-bending device 30, which is equipped with a press-bending die 31, and place the sheet 28 in the press-bending die for positioning. After positioning, the vertical plate height bisector auxiliary line 36 of the sheet 28 coincides with the center line 35 of the press-bending die. The position of the vertical plate height bisector auxiliary line 36 is obtained by making the distance 37 equal to the distance 38. Start the press-bending device, and the press-bending die bends the sheet to form a finished product having a vertical plate, an upper folding plate on the upper end of the vertical plate, and a lower folding plate at the lower end of the vertical plate, and the middle width of the upper folding plate is equal to the middle width of the lower folding plate, and the upper and lower folding plates are located on the same side of the vertical plate.
Claims
1. A variable cross-section beam for a truck spare tire rack, characterized in that: A vertical plate (1) is provided with a long side being horizontal and arranged in a vertical direction. An upper folding plate (2) is provided on the long side of the upper end of the vertical plate and is bent horizontally toward the side of the vertical plate. A lower folding plate (3) is provided on the long side of the lower end of the vertical plate and is bent horizontally toward the side of the vertical plate. The upper and lower folding plates are on the same side of the vertical plate. The horizontal side (4) of the upper folding plate is convex relative to the vertical plate, and the horizontal side (5) of the lower folding plate is concave relative to the vertical plate. The convex horizontal side (4) of the upper folding plate or the concave horizontal side (5) of the lower folding plate is an axially symmetrical figure about the perpendicular midline (8) of the long side of the vertical plate. Both ends of the lower folding plate are provided with a crossbeam mounting hole.
2. The variable cross-section beam for a truck spare tire rack according to claim 1, characterized in that: The upper folding plate transverse edge (4) and the lower folding plate transverse edge (5) have the same shape.
3. The variable cross-section beam for a truck spare tire rack according to claim 1, characterized in that: The middle width (11) of the upper folding plate is equal to the middle width (12) of the lower folding plate.
4. The variable cross-section beam for a truck spare tire rack according to claim 1, characterized in that: There are two lifting mechanism mounting holes in the middle of the vertical plate, and the diameter of the holes is 17.5 mm.
5. The variable cross-section beam for a truck spare tire rack according to claim 1, characterized in that: The diameter of the crossbeam mounting hole of the lower folding plate is 14mm; the thickness of the vertical plate, upper folding plate and lower folding plate is 3.75mm, the length of the vertical plate is 820mm, the height of the vertical plate is 63mm, the middle width of the upper folding plate and the middle width of the lower folding plate are 39mm, the width at both ends of the upper folding plate is 12mm, and the width at both ends of the lower folding plate is 66mm.
6. A method for manufacturing the variable cross-section beam for a truck spare tire rack according to claim 1, characterized in that: The following steps are involved: 1) Leveling: using a leveling machine, a roll plate (22) having a width equal to the length of the vertical plate is selected, and one end of the roll plate is continuously fed into the leveling machine (23) for leveling to obtain a leveled plate material (24); 2) Punching and cutting off the waste head: a punching die (26) and a cutting die (27) are installed on the punching machine (25), and the leveled sheet material is fed into the punching machine and passed through the punching die. When the end of the sheet material exceeds a certain length of all the cutting edges of the cutting die, the feeding is stopped, and the punching machine is started. The punching die and the cutting die move downward synchronously. The punching die punches out the lifting mechanism mounting hole (6) and the beam mounting hole (7) for the first time, and the cutting die cuts off the waste head (29) and also cuts out the concave lower folding plate horizontal edge (5) of the first piece of material (28) in a separate cutting manner with the same cutting edge; 3) Punching and cutting: the sheet material with the lifting mechanism mounting hole (6) and the beam mounting hole (7) punched out for the first time and the waste head (29) cut off is fed into the die for a certain distance and then the feeding is stopped, the punching machine (25) is started again, the punching die and the cutting die move downward synchronously, the punching die punches out the lifting mechanism mounting hole (6) and the beam mounting hole (7) again, and the cutting die cuts off the first sheet material (28) with the lifting mechanism mounting hole (6) and the beam mounting hole (7) punched out for the first time, the concave lower folding plate horizontal edge (5) and the convex upper folding plate horizontal edge (4) punched out this time by the same cutting edge separation cutting method; the convex upper folding plate horizontal edge has the same shape as the concave lower folding plate horizontal edge; each of the following steps is to feed the sheet material into the die of the punching machine in a stepping manner according to the distance obtained for the first sheet material to be punched, the feeding and punching cycle is carried out, and one sheet material is obtained in each cycle; 4) Pressing: using a bending device (30) equipped with a bending die (31), placing the sheet (28) in the bending die for positioning, after which the vertical plate height bisecting auxiliary line (36) on the sheet (28) coincides with the center line (35) of the bending die, starting the bending device, and the bending die bends the sheet to form a finished product having a vertical plate, an upper folding plate at the upper end of the vertical plate, and a lower folding plate at the lower end of the vertical plate, wherein the middle width of the upper folding plate is equal to the middle width of the lower folding plate, and the upper and lower folding plates are located on the same side of the vertical plate.
Citation Information
Patent Citations
Variable cross-section cross beam for truck spare wheel carrier
CN216546418U