CN112139352A - Stamping process of automobile front floor - Google Patents

Abstract

The invention discloses a stamping process of an automobile front floor. The method comprises three procedures: drawing, trimming and punching, trimming, flanging and cutting; the integral drawing depth of the drawing process is designed to be shallow, the flanging of the part is directly unfolded on the pressing surface for trimming, the flanging fillet R1 of the part is directly inverted with the pressing surface to form a fillet R2, and no redundant process supplementary modeling exists between the part and the pressing surface; the material pressing surface is not provided with a drawing rib, the flow of the sheet material is controlled by adjusting the pressure of the material pressing surface, or the flow of the sheet material is controlled by adjusting the number, shape and fillet size of the steps of the step structure by selecting a drawing threshold with a single-side step structure; the method has the advantages that the material utilization rate of the part is obviously improved by reducing the part-to-part distance s between the left part and the right part, reducing the integral drawing depth, eliminating the supplement of the drawing process, adopting the single-side step structure drawing bead or eliminating the drawing bead and the like; the material utilization rate of the invention is improved by 8 percent, and the reduction of the raw material cost of parts is realized.

Description

A kind of stamping process of automobile front floor

technical field

The invention relates to the technical field of vehicle vehicle engineering, in particular to a stamping process for an automobile front floor.

Background technique

The front floor parts of the car are generally divided into two parts: left and right connecting plates. The shape is simple and symmetrical, only the partial bosses are asymmetrical, and one side is flanged. The traditional stamping process design is generally deep drawing in process 1, trimming and punching in process 2, and trimming and flanging in process 3. As shown in Figure 6, the process design feature of deep drawing in process 1 is that the parts are flanged and unfolded. In terms of process supplementation, trimming is performed in process 2, and there are redundant process supplementary shapes between the trimming line and the binder surface. After drawing and forming, the excess process supplementary material is cut off in process 2, which makes the overall material utilization rate of the part low, resulting in unnecessary cost waste.

Patent document 1CN103357754B discloses a square-shaped automobile beam part by changing the traditional drawing process to the forming process, so as to shorten the number of processes, save the investment cost of the mold, and improve the material utilization rate.

Patent document 2CN103624144B describes an automobile front floor sill beam part, which is characterized by unilateral flanging, which results in uneven force during flanging. Part quality stability.

Patent document 3CN205309121U discloses a rear floor front reinforcing plate part. By changing the original single-piece production to the piece-to-piece production in a mold, the proportion of process supplements is reduced and the material utilization rate is improved.

The present invention is a stamping process for automobile front floor parts, which is characterized in that the design of the drawing process is different from the traditional deep drawing process, and the overall drawing depth design is shallow, so that the flanging of the parts is directly unfolded on the pressing material. The surface is trimmed, and there is no extra process between the parts and the binder surface to supplement the modeling, so as to achieve the purpose of improving the utilization rate. The parts targeted by the three patent documents are different, and the method of process optimization is also different.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the above problems existing in the prior art and provide a stamping process for the front floor of an automobile.

In order to solve the above-mentioned technical problems, the present invention is realized by adopting the following technical solutions, which are described as follows in conjunction with the accompanying drawings:

The invention discloses a stamping process for an automobile front floor. It includes three processes: drawing process 1, trimming and punching process 2, trimming and flanging cutting process 3. The process design features are: the design of the drawing process 1 is different from the traditional deep drawing process, and the design of the overall drawing depth d is shallower than the drawing depth d1 of the traditional deep drawing, so that the flanging of the part is directly unfolded in the pressing process. On the material surface, trimming is performed in the trimming and punching process 2, and flanging is performed in the trimming and flanging cutting process 3 to obtain the final product.

In the drawing process 1, the flanging fillet R1 of the part is directly connected to the blanking fillet R2 of the binder surface, and there is no extra process supplementary shape between the part and the binder surface. At the same time, no drawing bead is added on the pressing surface, and the flow of the sheet is controlled by adjusting the pressure on the pressing surface, or a drawing sill with a unilateral step structure is used to control the sheet material by adjusting the shape of the step structure and the size of the rounded corners. flow. The shape of the traditional drawbead is semicircle or square, and the structure size is large, resulting in waste of material.

A stamping process for an automobile front floor includes the following three processes:

Drawing process; trimming and punching process; trimming and flanging cutting process.

Further, in the drawing process, the flow control of the sheet material is realized by adjusting the size of the pressing force, or the drawing sill with a one-sided step structure is used to control the drawing sill, so that the blank line drawn to the bottom is closer to the trimming line.

Further, the parts of the front floor of the automobile are divided into two parts, left and right, with symmetrical shapes. A single part is flanged on one side, and the left and right parts are produced in pairs, and the flanging is on the outside.

Further, in the drawing process, the value of the drawing depth d of the part should ensure that in the trimming and punching process 2), the flanging of the part is unfolded on the pressing surface for trimming.

Further, in the drawing process, a part of the product flanging fillet R1 is pulled out during drawing, and the die fillet R2 is a transition fillet between the product flanging fillet R1 and the pressing surface directly, and the value of R2 In the case of ensuring that the trimming is not on the rounded corner R2, the larger the value, the better.

Further, in the drawing process, convex ribs or concave ribs are added to the middle of the left and right parts to optimize the overall formability, and the size of the increased convex ribs or concave ribs is determined according to the actual forming requirements.

Preferably, two concave ribs are added to the part to optimize the overall formability, and the height of the concave ribs is designed to be 4mm and the width of the concave ribs is designed to be 8mm.

Further, the value of the left and right piece-to-piece distance s under the condition of ensuring the strength of the trimming die, the smaller the value, the higher the material utilization rate, and the value range is 10mm to 30mm.

Further, the flange height h is 15mm˜25mm.

Further, the value of the drawing depth d of the part depends on the product flanging height h and the product shape, and the value of d is 5 mm to 20 mm.

Further, the value of R2 should be as large as possible under the condition that the trimming will not be trimmed to the fillet R2; the value of R2 should be more than 8 times the thickness of the material.

Compared with the prior art, the beneficial effects of the present invention are:

In the present invention, the material utilization rate of the parts is improved by reducing the distance s of the left and right parts, reducing the overall drawing depth, canceling the drawing process supplement, canceling the drawing bead, or adopting a single-sided stepped structure to draw the sill. Significantly increased. For the automobile front floor parts mentioned in the present invention, after the stamping process scheme is adopted, the material utilization rate is increased by 8%, and the cost of the raw materials of the parts is reduced.

Description of drawings

Below in conjunction with accompanying drawing, the present invention is further described:

Figure 1 is a schematic diagram of the structure of the front floor of an automobile.

FIG. 2 is a schematic drawing of the drawing process.

FIG. 3 is a schematic diagram of trimming and punching in the trimming and punching process.

FIG. 4 is a schematic diagram of trimming, flanging and cutting in the trimming and flanging cutting process.

FIG. 5 is a schematic diagram of the process at the section A-A in FIG. 2 .

Figure 6 is a schematic diagram of the process at the traditional deep drawing section A-A.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in detail:

A stamping process for an automobile front floor includes the following three processes:

Drawing process; trimming and punching process; trimming and flanging cutting process.

The parts of the front floor of the car are divided into two parts: left and right parts, most of which are symmetrical in shape, and a single part is flanged on one side, similar to the factory-shaped and y-shaped. Under the condition of ensuring the strength of the trimming die, the smaller the value is, the higher the material utilization rate is.

In the drawing process, the value of the drawing depth d of the part is to ensure that in the trimming and punching process, the flanging of the part is unfolded on the pressing surface for trimming.

In the drawing process, the product flanging fillet R1 is partially pulled out during drawing, and the die fillet R2 is the transition fillet between the product flanging fillet R1 and the pressing surface directly, and the value of R2 is to ensure the repair. If the edge is not trimmed to the rounded corner R2, the larger the value, the better.

In the drawing process, convex ribs or concave ribs can be added to the middle of the left and right parts to optimize the overall formability, and the size of the increased convex ribs or concave ribs is determined according to the actual forming requirements.

In the drawing process, the drawbead adopts a single-sided step structure, and the flow of the sheet material is controlled by adjusting the number, shape and fillet size of the steps, and the drawbead may not be added.

As shown in FIG. 1 to FIG. 6 , a stamping process of an automobile front floor includes a drawing process, a trimming and punching process, and a trimming and flanging cutting process.

The front floor parts shown in Figure 1 are divided into two parts: left and right connecting plates, most of which are symmetrical in shape, flanged on one side, similar to the shape of a factory and a zigzag, and the flange height h is generally 15mm ~ 25mm. For piece production, the flanging of the piece is on the outside, and the value of the distance s for the piece is under the condition of ensuring the strength of the trimming die. The smaller the value is, the higher the material utilization rate is. The design of the drawing process is different from the traditional deep drawing process. The overall drawing depth is designed to be shallow, so that the flanging of the part in the trimming and punching process is directly unfolded on the pressing surface for trimming, and the flanging and fillet position of the part reaches The value of the drawing depth d of the binder surface depends on the product flanging height h and the product shape. Generally, the value of d is 5 mm to 20 mm. It can be seen from the comparison in FIG. 6 that the drawing depth d of the present invention is much smaller than the traditional deep drawing. The drawing depth d1 of the extension. The product flanging fillet R1 is pulled out part of it after drawing, and the die fillet R2 is the transition fillet between the product flanging fillet R1 and the pressing surface directly, and the value of R2 is to ensure that the trimming does not reach the fillet R2. In the case of , the larger the value, the better the flanging quality of the parts. Generally, R2 is designed to be more than 8 times the material thickness.

In the drawing process, preferably no drawing bead is added on the binder surface, and the flow of the sheet material is controlled by the pressure on the binder surface. Or choose a drawing sill with a single-sided step structure, and control the flow of the sheet by adjusting the number, shape and fillet size of the step structure. However, the shape of the traditional drawbead is semicircle or square, and the structure size is large, resulting in waste of material, as shown in Figure 6. Convex ribs or concave ribs can be added to the middle of the left and right parts to optimize the overall formability. The size of the increased convex ribs or concave ribs is determined according to the forming requirements of the actual parts.

The invention can obviously improve the material utilization rate of the parts by reducing the distance s between the parts, reducing the drawing depth, canceling the supplement of the drawing process, canceling the drawing bead or adopting the single-side step structure drawing sill. For the automobile front floor parts mentioned in the present invention, after the stamping process scheme is adopted, the material utilization rate is increased by 8%, and the cost of the raw materials of the parts is reduced.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this, any person skilled in the art is within the technical scope disclosed by the present invention, and all within the spirit and principle of the present invention Any modifications, equivalent replacements and improvements made within the scope of the present invention should be included within the protection scope of the present invention. Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

2 to 5 are schematic diagrams of the front floor stamping process disclosed in the present invention.

Figure 2 is a drawing diagram of drawing process 1. In the drawing process, the left and right parts are produced on the part, the parts are flanged on the outside after the part is assembled, and the value of the distance s between the parts is in the condition to ensure the strength of the trimming die The smaller the value, the higher the material utilization rate. At the same time, it is considered to add process supplementary shape ribs or concave ribs at the middle part to optimize the overall formability. The size of the increased convex ribs or concave ribs is based on the actual part forming It depends on the demand, so the value of the distance s is generally 10mm ~ 30mm. In this example, the preferred minimum distance between parts is 12mm, and two concave ribs are added at the parts to optimize the overall formability. The height of the concave ribs is designed to be 4mm and the width of the concave ribs is designed to be 8mm.

The design of drawing process 1 is different from the traditional deep drawing process. The design of the overall drawing depth d is shallow, so that the flanging of the part is directly unfolded on the pressing surface for trimming, as shown in Figure 2. Unfold the trim line on the binder surface. The value of the drawing depth d from the position of the flanging fillet of the part to the pressing surface depends on the product flanging height h and the product shape. Generally, the value of d is 5 mm to 20 mm. The depth d is much smaller than the drawing depth d1 of conventional deep drawing. The product flanging fillet R1 is partially formed in the drawing process, and the die fillet R2 is the transition fillet between the product flanging fillet R1 and the pressing surface directly, and the value of R2 is to ensure that the trimming does not reach the fillet R2. In the case of , the larger the value is, the better the flanging quality of the part will be. Generally, R2 is designed to be more than 8 times the material thickness.

During drawing, the initial billet line is shown in Figure 2. As the upper die (concave die) descends and closes with the pressing ring, the billet is pressed down and formed together. After drawing to the end, the billet line is shown in Figure 2. The inflow of the sheet is less, and the maximum inflow of the sheet in this example is 9mm. The control of the flow of the traditional deep drawing sheet is mainly controlled by the semicircular or square shape of the drawbead, resulting in material waste. In the present invention, the control of the flow of the sheet does not rely on the traditional In the case of drawbeads, the flow control of the sheet metal is realized by adjusting the size of the pressing force, or the drawing sill control of the unilateral step structure is adopted, so that the blank line drawn to the bottom is closer to the trimming line, and the waste is more. less, and higher utilization. In this example, it is preferable to use the process without drawing bead. By adjusting the pressing force, the inflow of the sheet material is controlled within 10mm, and the distance between the blank line after drawing to the end is controlled to be more than 10mm from the trimming line, so as to improve the material utilization rate.

FIG. 3 is a schematic diagram of trimming and punching in step 2 of trimming and punching. First, cut off all the flanging and unfolding lines on both sides of the part, so as to facilitate the flanging in the trimming and flanging cutting process 3, and then trim the two ends of the part in sections to facilitate the slipping of waste materials. Carry out punching to facilitate trimming, flanging and cutting process 3. Separate the left and right parts, and finally punch the hole features on the parts, focusing on completing the punching of the reference hole to facilitate the trimming and flanging cutting process 3 For positioning, for other hole features, under the premise of ensuring the strength of the mold, the punching of all hole features can be completed.

FIG. 4 is a schematic diagram of trimming, flanging and cutting in step 3 of trimming, flanging and cutting. First is trimming, cutting out the rest of the scrap. The second is flanging. The flanging process must ensure that the dimensional rebound of the part after flanging is qualified. In this example, the part flanging itself has a draft angle of 5 degrees, so the straight flanging process is preferred to ensure that the dimensional rebound of the part is qualified after flanging. Finally, the left and right pieces are separated and cut to obtain the final product. Note: If the trimming and punching process 2 cannot complete the punching of all hole features, the remaining hole features will be punched in the trimming, flanging and cutting process 3.

The invention can obviously improve the material utilization rate of the parts by reducing the distance s of the parts, reducing the drawing depth d, canceling the supplement of the drawing process, canceling the drawing bead or adopting the single-sided step structure drawing sill. For the automobile front floor parts mentioned in the present invention, after the stamping process scheme is adopted, the material utilization rate is increased by 8%, and the cost of the raw materials of the parts is reduced.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this, any person skilled in the art is within the technical scope disclosed by the present invention, and all within the spirit and principle of the present invention Any modifications, equivalent replacements and improvements made within the scope of the present invention should be included within the protection scope of the present invention. Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims (10)

1. The stamping process of the automobile front floor is characterized in that: the method comprises the following three steps:

a drawing process; trimming and punching; trimming, flanging and cutting; in the drawing process, the flowing of the plate is controlled by adjusting the material pressing force, or the drawing threshold of a single-side step structure is adopted for control, so that the distance between the blank line drawn to the bottom and the trimming line is closer.

2. The automobile front floor stamping process according to claim 1, wherein:

the automobile front floor part is divided into a left part and a right part, the shapes of the left part and the right part are symmetrical, the single part is flanged on one side, the left part and the right part are produced in a piece-to-piece mode, and the flanges are arranged on the outer sides.

3. The automobile front floor stamping process according to claim 1, wherein:

in the drawing process, the drawing depth d of the part is taken, and the flanging of the part is unfolded on a material pressing surface to be trimmed in the trimming and punching process.

4. The automobile front floor stamping process according to claim 1, wherein:

in the drawing process, a part of the product flanging fillet R1 is drawn out during drawing, the die fillet R2 is a transition fillet formed by directly chamfering the product flanging fillet R1 and the pressing surface, and the value of R2 is larger and better under the condition of ensuring that the trimming edge is not trimmed on the fillet R2.

5. The automobile front floor stamping process according to claim 1, wherein:

in the drawing process, convex ribs or concave ribs are added at the middle of the left piece and the right piece to optimize the integral formability, and the size of the added convex ribs or concave ribs is determined according to the actual forming requirement.

6. The automobile front floor stamping process according to claim 5, wherein:

two concave ribs are added at the part matching position to optimize the integral forming performance, the height of each concave rib is designed to be 4mm, and the width of each concave rib is designed to be 8 mm.

7. The automobile front floor stamping process according to claim 2, wherein:

the value of the left and right piece pairing distance s is smaller under the condition of ensuring the strength of the trimming die, the material utilization rate is higher, and the value range is 10-30 mm.

8. The automobile front floor stamping process according to claim 2, wherein:

the height h of the flanging is 15 mm-25 mm.

9. The automobile front floor stamping process according to claim 3, wherein:

the drawing depth d of the part depends on the flanging height h and the product shape of the product, and the value of d is 5-20 mm.

10. The automobile front floor stamping process according to claim 4, wherein:

the value of R2 is larger and better under the condition of ensuring that the trimming edge is not repaired on the fillet R2; r2 is more than 8 times of the thickness of the material.

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