CN112139352A - Stamping process of automobile front floor - Google Patents

Stamping process of automobile front floor Download PDF

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Publication number
CN112139352A
CN112139352A CN202010841632.6A CN202010841632A CN112139352A CN 112139352 A CN112139352 A CN 112139352A CN 202010841632 A CN202010841632 A CN 202010841632A CN 112139352 A CN112139352 A CN 112139352A
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CN
China
Prior art keywords
trimming
flanging
front floor
automobile front
fillet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010841632.6A
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Chinese (zh)
Inventor
代晓旭
董剑
李刚
苏传义
白露露
曹晓聪
任闯
孙树森
赵超
鹿胜宝
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FAW Bestune Car Co Ltd
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FAW Bestune Car Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FAW Bestune Car Co Ltd filed Critical FAW Bestune Car Co Ltd
Priority to CN202010841632.6A priority Critical patent/CN112139352A/en
Publication of CN112139352A publication Critical patent/CN112139352A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D35/00Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/001Shaping combined with punching, e.g. stamping and perforating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D35/00Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00Making other particular articles
    • B21D53/88Making other particular articles other parts for vehicles, e.g. cowlings, mudguards

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

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

Stamping process of automobile front floor
Technical Field
The invention relates to the technical field of vehicle type engineering, in particular to a stamping process of an automobile front floor.
Background
The automobile front floor part is generally divided into a left connecting plate part and a right connecting plate part, is simple in shape and symmetrical left and right, and is only provided with a local boss which is asymmetrical and a single-side flanging. The traditional stamping process design generally comprises a step 1 of deep drawing, a step 2 of trimming and punching, and a step 3 of trimming, flanging and cutting, as shown in fig. 6, wherein the step 1 of deep drawing is characterized in that a part flanging is spread on a process supplement, trimming is carried out in the step 2, and redundant process supplement modeling exists between a trimming line and a pressure surface. After drawing and forming, redundant process supplement partial materials are cut in the working procedure 2, so that the whole material utilization rate of parts is low, and unnecessary cost waste is generated.
Patent document 1CN103357754B discloses that a traditional drawing process is changed into a forming process, so as to achieve the purposes of shortening the number of working procedures, saving the investment cost of a mold, and improving the utilization rate of materials.
Patent document 2CN103624144B discloses a threshold beam part of a front floor of an automobile, which is characterized in that the part is flanged on one side, so that the stress is uneven when flanging is performed.
Patent document 3CN205309121U discloses a rear floor front reinforcing plate component, which changes the original single-piece production into the piece-by-piece production in a mold, thereby reducing the process supplement ratio and improving the material utilization rate.
The invention relates to a stamping process for automobile front floor parts, which is characterized in that the design of a drawing process is different from that of the traditional deep drawing process, the integral drawing depth is designed to be shallow, the flanging of the parts is directly unfolded on a pressing surface for trimming, and no redundant process supplement modeling exists between the parts and the pressing surface, so that the purpose of improving the utilization rate is achieved. Unlike the three patent documents for parts, the process optimization method is different.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the problems in the prior art and provides a stamping process for a front floor of an automobile.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme, which is described by combining the accompanying drawings as follows:
the invention discloses a stamping process of an automobile front floor. The method comprises three procedures: drawing process 1, trimming and punching process 2 and trimming, flanging and cutting process 3. The process design is characterized in that: the design of the drawing process 1 is different from that of the traditional deep drawing process, the design of the integral drawing depth d is shallower than that of the traditional deep drawing process d1, so that the flanging of the part is directly spread on a pressure surface, trimming is carried out in the trimming and punching process 2, and the flanging is carried out in the trimming, flanging and cutting process 3 to obtain the final product.
In the drawing process 1, the flanging fillet R1 of the part is directly chamfered with the swaging surface fillet R2, and no redundant process supplementary modeling exists between the part and the swaging surface. Meanwhile, the material pressing surface is not provided with a drawing rib, the flow of the plate material is controlled by adjusting the pressure of the material pressing surface, or the drawing threshold with a unilateral step structure is selected, and the flow of the plate material is controlled by adjusting the shape of the step structure and the size of a fillet. The traditional draw bead is semicircular or square, and the structural size is large, so that material waste is caused.
A stamping process of an automobile front floor comprises the following three working procedures:
a drawing process; trimming and punching; trimming, flanging and cutting.
Furthermore, in the drawing process, the flowing of the plate is controlled by adjusting the magnitude of the pressing force, or the drawing threshold of a single-side step structure is adopted for controlling, so that the distance between the blank line drawn to the bottom and the trimming line is closer.
Furthermore, the parts of the automobile front floor are divided into a left part and a right part which are symmetrical in shape, 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.
Furthermore, in the drawing process, the drawing depth d of the part is taken, and the flanging and punching process 2) is ensured to stretch the flanging of the part on the pressing surface for trimming.
Further, 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 repaired on the fillet R2.
Furthermore, 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.
Preferably, two concave ribs are added to the part to optimize the integral formability, the height of each concave rib is designed to be 4mm, and the width of each concave rib is designed to be 8 mm.
Further, 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.
Further, the height h of the flanging is 15 mm-25 mm.
Furthermore, 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.
Further, under the condition that the value of R2 ensures that the fillet R2 is not repaired during trimming, the larger the value is, the better the value is; r2 is more than 8 times of the thickness of the material.
Compared with the prior art, the invention has the beneficial effects that:
the invention obviously improves the material utilization rate of parts by reducing the pair distance s of the left and right parts, reducing the integral drawing depth, eliminating the supplement of the drawing process, eliminating the draw bead or adopting the single-side step structure drawing threshold and other methods. After the stamping process scheme is adopted, the material utilization rate of the automobile front floor part is improved by 8%, and the raw material cost of the part is reduced.
Drawings
The invention is further described with reference to the accompanying drawings in which:
fig. 1 is a schematic diagram of a front floor structure of an automobile.
FIG. 2 is a drawing schematic of a drawing process.
FIG. 3 is a schematic view of the trimming and punching process.
FIG. 4 is a schematic view of the cut-open of the trimming cuff in the trimming cuff cut-open process.
FIG. 5 is a schematic view of the process at section A-A in FIG. 2.
FIG. 6 is a schematic view of a conventional deep drawing section A-A.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
a stamping process of an automobile front floor comprises the following three working procedures:
a drawing process; trimming and punching; trimming, flanging and cutting.
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 mostly symmetrical, a single part is flanged on one side and is similar to a Chinese character factory shape and an shape, the left part and the right part are produced in a matching mode, the flanging is arranged on the outer side, the matching distance s is smaller in value under the condition that the strength of a trimming die is guaranteed, and the material utilization rate is higher.
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.
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.
In the drawing process, convex ribs or concave ribs can be added at the middle part of the left part and the right part to optimize the integral formability, and the size of the added convex ribs or concave ribs is determined according to the actual forming requirement.
In the drawing process, the draw bead adopts a unilateral step structure, the flow of the plate is controlled by adjusting the number and the shape of steps and the size of a fillet, and the draw bead can be omitted.
As shown in fig. 1 to 6, the stamping process of the automobile front floor comprises a drawing process, an edge trimming and punching process and an edge trimming, flanging and cutting process.
The front floor part shown in the figure 1 is divided into a left connecting plate and a right connecting plate, the shapes of the left connecting plate and the right connecting plate are mostly symmetrical, the front floor part is flanged on one side and is similar to a Chinese character 'factory' shape and a '' shape, the height h of the flange is generally different from 15mm to 25mm, the left connecting plate and the right connecting plate are produced in a matched mode, the rear flange of the matched part is arranged on the outer side, the value of a matched part distance s is smaller under the condition that the strength of a trimming die is guaranteed, the material utilization rate. The design of the drawing process is different from that of the traditional deep drawing process, the integral drawing depth is designed to be shallow, the flanging of the part in the trimming and punching process is directly unfolded on the pressure surface for trimming, the value of the drawing depth d from the part flanging fillet position to the pressure surface depends on the flanging height h of the product and the product shape, generally the value of d is 5-20 mm, and the drawing depth d is far smaller than the drawing depth d1 of the traditional deep drawing process as can be seen from the comparison of figure 6. A part of a product flanging fillet R1 is drawn out during drawing, a female die fillet R2 is a transition fillet formed by directly chamfering a product flanging fillet R1 and a pressure surface, the value of R2 is larger under the condition that the trimming is not repaired on the fillet R2, the flanging quality of a part is better, and generally R2 is designed to be more than 8 times of material thickness.
In the drawing procedure, no drawing bead is added on the preferable pressing surface, and the flow of the plate is controlled by the pressure of the pressing surface. Or a drawing threshold with a unilateral step structure is selected, and the flow of the plate is controlled by adjusting the number, the shape and the size of a fillet of the step structure. The traditional draw bead is semicircular or square, and the structural size is large, so that the material is wasted, as shown in figure 6. The middle part of the left part and the right part can be provided with convex ribs or concave ribs to optimize the integral formability, and the size of the added convex ribs or concave ribs is determined according to the forming requirement of an actual part.
The invention can obviously improve the material utilization rate of parts by reducing the part distance s, reducing the drawing depth, eliminating the supplement of the drawing process, eliminating the drawing bead or adopting the single-side step structure drawing threshold and the like. After the stamping process scheme is adopted, the material utilization rate of the automobile front floor part is improved by 8%, and the raw material cost of the part is reduced.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims. And those not described in detail in this specification are well within the skill of those in the art.
Fig. 2 to 5 are schematic views illustrating a front floor stamping process according to the disclosure.
FIG. 2 is a drawing schematic diagram of a drawing process 1, in the drawing process, a left part and a right part are produced in a paired manner, the flanged edges of the paired parts are arranged on the outer sides, the value of a paired part distance s is smaller under the condition of ensuring the strength of a trimming die, the material utilization rate is higher, meanwhile, a process supplement shape convex rib or a concave rib is added at the middle paired part to optimize the integral formability, the size of the added convex rib or concave rib is determined according to the forming requirement of an actual part, and therefore the value of the paired part distance s is generally 10 mm-30 mm. In the example, the preferred minimum counter piece distance is 12mm, and two concave ribs are added at the counter piece to optimize the overall formability, wherein the height of each concave rib is designed to be 4mm, and the width of each concave rib is designed to be 8 mm.
The design of the drawing procedure 1 is different from that of the traditional deep drawing process, and the design of the integral drawing depth d is shallow, so that the flanging of the part is directly unfolded on the pressure surface for trimming, and the flanging of the part is unfolded on the trimming line on the pressure surface as shown in fig. 2. The value of the drawing depth d from the part flanging fillet position to the pressure surface depends on the flanging height h of the product and the product shape, generally the value of d is 5-20 mm, and as can be seen from comparison of figure 6, the drawing depth d of the invention is far less than the drawing depth d1 of the traditional deep drawing. The product flanging fillet R1 is partially formed in the drawing process, the female die fillet R2 is a transition fillet formed by directly chamfering the product flanging fillet R1 and the pressing surface, the value of R2 is larger under the condition of ensuring that the trimming is not repaired on the fillet R2, the flanging quality of a part is better, and generally R2 is designed to be more than 8 times of material thickness.
During drawing and delaying, the initial blank line is as shown in fig. 2, the blank is pressed and formed downwards along with the descending of the upper die (female die) and the closing of the material pressing ring, and the blank line is as shown in fig. 2 after drawing to the bottom. The inflow of the plate material is small, and the maximum inflow of the plate material is 9mm in the embodiment. The control of the traditional deep drawing plate material flow is mainly controlled by the drawing bead in the shape of a semicircle or a square to cause material waste, the invention realizes the control of the plate material flow by adjusting the pressure force under the condition of not adding the drawing bead instead of the traditional drawing bead, or adopts the drawing sill control with a unilateral step structure, thereby leading the distance between the blank line drawn to the bottom and the trimming line to be closer, leading the waste to be less and leading the utilization rate to be higher. In the embodiment, a process without a draw bead is preferably adopted, the inflow of the plate is controlled within 10mm by adjusting the pressing force, and the distance between the blank line drawn to the bottom and the trimming line is controlled to be more than 10mm, so that the utilization rate of the material is improved.
Fig. 3 is a schematic view of trimming and punching process 2. The method comprises the steps of cutting all flanging expansion lines on two sides of a part, conveniently trimming, flanging and cutting a workpiece in the process 3 to perform flanging, trimming two ends of the part in a segmenting mode to facilitate sliding of waste materials, punching a middle workpiece in the middle, conveniently trimming, flanging and cutting the workpiece in the process 3 to separate the left part from the right part, punching hole characteristics on the workpiece, mainly finishing blanking of a reference hole, conveniently trimming, flanging and cutting the workpiece in the process 3 for positioning, and finishing blanking of all hole characteristics on the premise of ensuring the strength of a die for other hole characteristics.
Fig. 4 is a schematic view of the trimming cuff slitting process 3. Firstly, trimming and cutting off the rest waste materials. And secondly, flanging, wherein the flanging process ensures that the size of the part after flanging is qualified, and the part flanging in the embodiment has a draft angle of 5 degrees, so that the straight flanging process is preferred to ensure that the size of the part after flanging is qualified. And finally, separating and cutting the left piece and the right piece to obtain a final product. Note: if the trimming and punching step 2 cannot complete the blanking of all hole characteristics, the trimming, burring and cutting step 3 completes the blanking of the remaining hole characteristics.
The invention can obviously improve the material utilization rate of parts by reducing the part distance s, reducing the drawing depth d, eliminating the supplement of the drawing process, eliminating the drawing bead or adopting the single-side step structure drawing threshold and other methods. After the stamping process scheme is adopted, the material utilization rate of the automobile front floor part is improved by 8%, and the raw material cost of the part is reduced.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims. And those not described in detail in this specification are well within the skill of those 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.
CN202010841632.6A 2020-08-20 2020-08-20 Stamping process of automobile front floor Pending CN112139352A (en)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN114210806A (en) * 2021-12-10 2022-03-22 东风汽车股份有限公司 Assembling die drawing die and drawing method for outer door plate of cargo vehicle
CN115502285A (en) * 2022-09-29 2022-12-23 东风汽车股份有限公司 Drawing die structure for front cross beam part of light truck floor and design method of drawing die structure

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114210806A (en) * 2021-12-10 2022-03-22 东风汽车股份有限公司 Assembling die drawing die and drawing method for outer door plate of cargo vehicle
CN115502285A (en) * 2022-09-29 2022-12-23 东风汽车股份有限公司 Drawing die structure for front cross beam part of light truck floor and design method of drawing die structure

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