CN109948215A - A kind of drop stamping technology establishment method - Google Patents
A kind of drop stamping technology establishment method Download PDFInfo
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- CN109948215A CN109948215A CN201910182460.3A CN201910182460A CN109948215A CN 109948215 A CN109948215 A CN 109948215A CN 201910182460 A CN201910182460 A CN 201910182460A CN 109948215 A CN109948215 A CN 109948215A
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Abstract
The present invention provides a kind of drop stamping technology establishment method, includes the following steps: step 1, using 3 d modeling software, establishes the geometrical model of part；Step 2, the selection of material constitutive equation in Finite Element Simulation Software choose several interval n values appropriate, successively carry out punching course numerical simulation, record the maximum value of equivalent plastic strain；Step 3, using n value as ordinate, equivalent strain maximum value is abscissa, and drawing data point, and being fitted to data point, obtained curve is considered as punching press criterion curve；Step 4 obtains the n- ε curve under the conditions of various modifications using stretching experiment method；Step 5 compares n- ε curve and punching press criterion curve, obtains the best heat stamping and shaping technological parameter of metal material.Method of the present invention is suitable for all metal materials, has many advantages, such as that the test period is short, test funds are few and testing equipment popularity rate is high.
Description
Technical field
The present invention relates to metallurgical technology fields, and in particular to a kind of drop stamping technology establishment method.
Background technique
Drop stamping technique refers under high temperature environment, carries out Pressing Deformation, and the Sheet Metal Forming Technology then cooled down rapidly is main to use
The high-intensitive part needed for producing Automobile sound, compared with original cold stamping, heat stamping and shaping technique has resistance of deformation
The advantages that small, plate is not easy to crack, and punching precision is high, and springback capacity is small after Pressing Deformation.Press temperature and rate of deformation are hot punchings
The technological parameter of two most criticals of molded technique.If technological parameter is chosen unreasonable, stamping cracking easily occurs for plate,
So the two technological parameters deform drop stamping, there is vital meaning.
Currently, there are mainly two types of for the method for formulation drop stamping technique:
Method one, the minimum temperature of steel plate complete austenitizing；Drop stamping for steel plate, Pressing Deformation temperature are to rush
The minimum temperature of the complete austenitizing of pressure steel.The deformation temperature that this method determines, only Pressing Deformation drag is minimum
Temperature, not steel plate have maximum distortion ability temperature.The application range of this method is also very narrow, is only applicable to steel
Material.
Method two, method for numerical simulation；It to different press temperature and drawing velocity, is combined, measures stamping material
In the stress-strain diagram under various combination conditions and the high-temperature molding limit curve at multiple temperature.Then, in various changes
Under the conditions of shape, using finite element software carry out Pressing Deformation process numerical simulation, and by the principal strain field computation of simulation as a result,
It is compared with high-temperature molding limit curve, with the reasonable hot stamping process parameters of determination.This method can play material
Maximum distortion ability, still, since the selection range of press temperature and drawing velocity is very big, so there are many combination condition, work
Work amount is huge.If it is the part of complicated shape, calculation amount is also quite huge, can consume a large amount of computing resource and very long calculating
Time.Further, since the number of devices that can measure high-temperature molding limit curve is few, so testing expense is higher, test period
It is longer.
Above two method has its limitation, and method one cannot play the maximum distortion ability of material itself, and only fit
With for steel material.The workload of method two is huge, and cost is time-consuming.So both methods can not be quickly inexpensively true
Determine the best thermoforming process of material.
Summary of the invention
Technical assignment of the invention is provided a kind of based on work hardening index n value for the above the deficiencies in the prior art
With the drop stamping technology establishment method of finite element modelling.
The technical scheme of the invention to solve the technical problem is: a kind of drop stamping technology establishment method, including
Following steps:
Step 1 establishes the geometrical model of drop stamping fabricated part using 3 d modeling software, and the geometrical model is defeated
Enter into Finite Element Simulation Software；
Step 2 selects the material constitutive equation of equation (1) form in Finite Element Simulation Software；
σ=K εn (1)
In formula: the σ is equivalent stress, and the ε is equivalent plastic strain, and the n is work hardening index；The K value
For the arbitrary number chosen in reasonable range；K value is on the final judgement result of this method without influence；
Several n values are chosen in reasonable numberical range, then under the conditions of each n value, carry out a punching press number
Value simulation, records the maximum value ε of the equivalent plastic strain ε in each analog resultp；
Step 3, using n value as ordinate, corresponding equivalent plastic strain maximum value εpAs abscissa, in two dimension
It draws these points in plane coordinate system, and these is put using equation (2) and carries out numerical fitting, obtain a curve, as sentencing
According to curve；
Step 4 chooses deformation temperature and rate of deformation in reasonable range, carries out thermal simulation using hot modeling test machine
Tension test, delete every tensile stress strain curve elastic part and constriction after part, then residual curve is fitted
Filtering processing is finally directed to every curve, calculates n- ε curve of material under the conditions of various modifications using equation (3)；
Step 5, the n- ε curve that the criterion curve that step 3 is obtained and step 4 obtain carry out pair under the same coordinate system
Than appearing on the right side of criterion curve, then illustrating the corresponding deformation condition of the curve if n- ε curve can pass through criterion curve
It can guarantee that punching press is not cracked, if n- ε curve cannot pass through criterion curve, illustrate that stamping cracking phenomenon can occur.
Further, the number of n value is 4~6 in the step 2.
Further, in the step 5, the position of n- ε curve in a coordinate system is higher, the punching press of corresponding deformation condition
Safety margin is higher.
Gleeble hot modeling test machine and less calculating are used only in drop stamping technology establishment method of the present invention
Resource, without measuring high-temperature molding limit curve, can Accurate Determining metal material best heat stamping and shaping technological parameter, most
Good temperature and best rate of deformation.It is compared with the traditional method, method of the present invention is suitable for all metal materials, has examination
Test the advantages that period is short, test funds are few and testing equipment popularity rate is high.
Detailed description of the invention
Theoretical foundation schematic diagram Fig. 1 of the invention；
3/4 geometrical model figure of stamping parts in Fig. 2 embodiment of the present invention；
N- ε curve comparison figure in Fig. 3 embodiment of the present invention under criterion curve and different condition.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
The theoretical foundation of the method for the invention is as follows:
Work hardening index n value is able to reflect the ability that plate resists local reduction, and n value is bigger, it is meant that, in punching press
In deformation process, the ability that plate resists local reduction is stronger.
For example, if the criterion curve being fitted is as shown in Figure 1, on curve after the completion of step 3 of the invention
Any point A, physical significance are: if the n value perseverance of material is 0.2, in the case where local reduction does not occur, and punching
After the completion of pressure (A point), what material was born is plastic deformation to 0.19 (A point abscissa).
The n value of metal material can be gradually reduced with the increase of plastic strain, as shown in figure 1 shown in material n- ε curve.This
, it is intended that n value of the material before A point is all larger than 0.2, possess the material of this mechanical property, resists local reduction's energy
Power is better than BA curve, so the maximum plastic deformation amount that material internal generates will necessarily be less than 0.19 after punching press.
At the same time, n- ε curve can extend to the right side of criterion curve, can assert, which will not be before A point
Fracture, the amount of plastic deformation that material is able to bear are greater than 0.19.
Therefore, as long as the n- ε curve of material can extend to the right side of criterion curve, can assert, which can hold
The amount of plastic deformation received is greater than required amount of plastic deformation, and punching course will not generate cracking；On the contrary, if the n- ε of material is bent
Line could not extend to the right side of criterion curve, that is, can determine that, punching course can crack.
Embodiment
The present invention provides a kind of drop stamping technology establishment method, includes the following steps:
Step 1 establishes the geometrical model (Fig. 2) of stamping parts using 3 d modeling software, such as UG and CATIA, and should
Geometrical model is input in Finite Element Simulation Software；
Step 2 selects the material constitutive equation of equation (1) form in Finite Element Simulation Software, and it is appropriate to choose 4 intervals
N value, successively carry out punching course numerical simulation, this example choose 0.10,0.15,0.20 and 0.30, successively carry out 4 times simulation,
After the completion of punching press, the results are shown in Table 1 for equivalent plastic strain field computation；
σ=K εn (1)
1 equivalent strain field computation result of table
Step 3, using n value as ordinate, the equivalent plastic strain maximum value in calculated result is successively drawn as abscissa
4 points are made, and this 4 points are fitted to a curve using equation (2), as criterion curve, criterion curve is as shown in Figure 3.
Step 4 chooses deformation temperature and rate of deformation in reasonable range, using hot modeling test machine Gleeble into
Row thermal simulation tension test, delete every tensile stress strain curve elastic part and constriction after part, then to residual curve
It is fitted filtering processing, is finally directed to every curve, it is bent to calculate n- ε of material under the conditions of various modifications using equation (3)
Line；
Step 5, by step 3 obtain criterion curve and step 4 obtain n- ε curve combining, under the same coordinate system into
Row comparison, as shown in Figure 3:
Judging result shows:
Process conditions (1000 DEG C of temperature, rate of deformation 8s-1) under, homologous thread is because elongation percentage is insufficient, the technique
Condition is unable to complete punching press；
Process conditions (1000 DEG C of temperature, rate of deformation 0.25s-1), (600 DEG C of temperature, rate of deformation 8s-1), (temperature
700 DEG C, rate of deformation 8s-1) under, although the elongation percentage of material is very big, since n value is too low, above-mentioned process conditions can not yet
Complete punching press；
Process conditions (800 DEG C of temperature, rate of deformation 8s-1), (900 DEG C of temperature, rate of deformation 8s-1) under, it can be smooth
Punching press is completed, does not generate cracking；Process conditions (800 DEG C of temperature, rate of deformation 8s-1) curve in process conditions (temperature 900
DEG C, rate of deformation 8s-1) curve above, n value is bigger, is optimal processing parameter so its process conditions is more excellent.
The basic dimension of method of the present invention, the use during calculating and testing need to be consistent.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (3)
1. a kind of drop stamping technology establishment method, which comprises the steps of:
Step 1 establishes the geometrical model of drop stamping fabricated part using 3 d modeling software, and the geometrical model is input to
In Finite Element Simulation Software；
Step 2 selects the material constitutive equation of equation (1) form in Finite Element Simulation Software；
σ=K εn (1)
In formula: the σ is equivalent stress, and the ε is equivalent plastic strain, and the n is work hardening index；The K value be
The arbitrary number chosen in reasonable range；K value is on the final judgement result of this method without influence；
Several n values are chosen in reasonable numberical range, then under the conditions of each n value, carry out a punching press Numerical-Mode
It is quasi-, record the maximum value ε of the equivalent plastic strain ε in each analog resultp；
Step 3, using n value as ordinate, corresponding equivalent plastic strain maximum value εpAs abscissa, in two-dimensional surface
These points are drawn in coordinate system, and these are put using equation (2) and carries out numerical fitting, obtain a curve, as criterion song
Line；
Step 4 chooses deformation temperature and rate of deformation in reasonable range, carries out thermal simulation stretching using hot modeling test machine
It tests, part after the elastic part and constriction of every tensile stress strain curve of deletion, then filtering is fitted to residual curve
Processing is finally directed to every curve, calculates n- ε curve of material under the conditions of various modifications using equation (3)；
The n- ε curve that step 5, the criterion curve that step 3 is obtained and step 4 obtain, compares under the same coordinate system,
If n- ε curve can pass through criterion curve, appears on the right side of criterion curve, then illustrate that the corresponding deformation condition of the curve can
Guarantee that punching press is not cracked, if n- ε curve cannot pass through criterion curve, illustrates that stamping cracking phenomenon can occur.
2. a kind of drop stamping technology establishment method according to claim 1, which is characterized in that of n value in the step 2
Number is 4~6.
3. a kind of drop stamping technology establishment method according to claim 1, which is characterized in that in the step 5, n- ε is bent
The position of line in a coordinate system is higher, and the secure ram nargin of corresponding deformation condition is higher.
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| CN201910182460.3A CN109948215B (en) | 2019-03-12 | 2019-03-12 | Hot stamping process making method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113836715A (en) * | 2021-09-22 | 2021-12-24 | 湖南大学 | Forging deformation process test method |
| CN116653347A (en) * | 2023-07-27 | 2023-08-29 | 合肥合锻智能制造股份有限公司 | Servo stamping process curve control method based on quintic polynomial optimization |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090177417A1 (en) * | 2006-02-01 | 2009-07-09 | Shigeru Yonemura | Fracture prediction method, device, a program arrangement and computer-accessible medium therefor |
| CN106018129A (en) * | 2016-05-16 | 2016-10-12 | 湖南大学 | Evaluation method for hot stamping fracture property of automobile part |
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2019
- 2019-03-12 CN CN201910182460.3A patent/CN109948215B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090177417A1 (en) * | 2006-02-01 | 2009-07-09 | Shigeru Yonemura | Fracture prediction method, device, a program arrangement and computer-accessible medium therefor |
| CN106018129A (en) * | 2016-05-16 | 2016-10-12 | 湖南大学 | Evaluation method for hot stamping fracture property of automobile part |
Non-Patent Citations (1)
| Title |
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| 黄张裕等: "高速铁路用铜镁合金接触线材料热变形方程及其模拟应用", 《上海有色金属》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113836715A (en) * | 2021-09-22 | 2021-12-24 | 湖南大学 | Forging deformation process test method |
| CN113836715B (en) * | 2021-09-22 | 2023-11-10 | 湖南大学 | Forging deformation process test method |
| CN116653347A (en) * | 2023-07-27 | 2023-08-29 | 合肥合锻智能制造股份有限公司 | Servo stamping process curve control method based on quintic polynomial optimization |
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