CN103521592B - Improve the method for quality of fracture of blank of high-strength steel - Google Patents
Improve the method for quality of fracture of blank of high-strength steel Download PDFInfo
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- CN103521592B CN103521592B CN201310062716.XA CN201310062716A CN103521592B CN 103521592 B CN103521592 B CN 103521592B CN 201310062716 A CN201310062716 A CN 201310062716A CN 103521592 B CN103521592 B CN 103521592B
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Abstract
The object of the present invention is to provide a kind of method improving quality of fracture of blank of high-strength steel.For realizing the method for the raising quality of fracture of blank of high-strength steel of described object, for the method that local essence after Integral blanking is cut, comprise the following steps: step a, in blank design, require that blanking outline line outwards expands, to increase allowance by higher stretching class flange region in quality of fracture of blank; Step b, blanking punched to blank entirety, fracture euphotic belt requires to account for fracture thickness 10 ~ 30%, and the euphotic belt in the class flange region that stretches accounts at least 30% of fracture thickness size; And step c, local essence is adopted to cut, the allowance stamping-out will increased in stretching class flange region, essence cuts gap 30-50% less of overall blanking punched gap, processes the punching press fracture obtained and makes euphotic belt account for more than 70% of fracture thickness size in stretching class flange region.
Description
Technical field
The present invention relates to Sheet Metal Forming Technology, particularly relate to the Sheet Metal Forming Technology of high-strength steel.
Background technology
Along with the development of automotive light weight technology technology, the application of high-strength steel on automobile chassis is more and more extensive.Advanced super-strength multiphase steel CP800 belongs to first Application at home for the production of automobile chassis parts, is mainly used in chassis at present and connects component of rod category.The process of connecting rod part mainly adopts stamping operation, carries out elongation class flange in local.This process form is in forming process, by the distortion of the continuous thinning realization of the thickness of stamping blanks in radial direction.When the limit that when correlative study shows to be shaped, thickness is evenly thinning and stamping and blanking, the surface quality of thickness end face has close contacting, and during blanking, the even reduction of the larger then thickness of thickness end face euphotic belt is larger, and stretching class flange deformation extent is also larger.
CP800 material, tensile strength is more than 800MPa, and uniform elongation will low 30%-50% compared to mild steel.Therefore under identical working condition, this material euphotic belt when blanking is smaller, and thickness end face surface quality is undesirable, is easy to cause the defect producing cracking in follow-up shaping, overturning process.
The existing method about improving thickness end face euphotic belt size mainly contains following several method:
One, overall reduction blade clearance when blanking punched, improves euphotic belt size.Blanking gap (punch-die cutting edge radius) size and end face euphotic belt size are inversely proportional to; Cutting edge radius size and blanking pressure size are also inversely proportional to simultaneously.Therefore along with gap reduces, stamping press significantly promotes, and economy is deteriorated.And for connecting rod part, the thickness requirement of euphotic belt is not on whole girth, often concentrates on local location, therefore overall gap is improved also is the waste that control ability drops into;
Two, reduce punching press gap at local location time blanking punched, improve the euphotic belt size of local location.This method is that design uses different blanking gaps on blanking die, uses little blanking gap, use large blanking gap in other regions in the region of stretching class flange.Because gap change causes the distribution of blanking pressure to be uneven, especially connect component of rod category for shape is asymmetric, course of work intermediate gap can be caused under uneven stressing conditions unstable.The requirement of euphotic belt thickness cannot be ensured.And Design of Dies is also caused in the blanking gap that local is strict with, manufacturing cost significantly rises;
Three, the method that essence rushes blanking realizes the method for entire bright band.Use special fine blanking technology in addition, the surface quality of end surface thickness can be improved, but have certain limitation for product size size.And improve production cost, initial investment is huge;
In order to solve the problem of advanced super-strength multiphase steel CP800 in automobile chassis connecting rod class part punching, inventing a kind of method improving quality of fracture of blank of high-strength steel, common press machine realizing local fine blanking technology, improves quality of fracture of blank.
Summary of the invention
The object of the present invention is to provide a kind of method improving quality of fracture of blank of high-strength steel.
For realizing the method for the raising quality of fracture of blank of high-strength steel of described object, being the method that local essence after Integral blanking is cut, comprising the following steps:
In quality of fracture of blank, step a, requires that blanking outline line outwards expands, to increase allowance by higher stretching class flange region in blank design;
Step b, blanking punched to blank entirety, fracture euphotic belt requires to account for fracture thickness 10 ~ 30%, and the euphotic belt in the class flange region that stretches accounts at least 30% of fracture thickness size; And
Step c, local essence is adopted to cut, the allowance stamping-out will increased in stretching class flange region, essence cuts gap 30-50% less of overall blanking punched gap, processes the punching press fracture obtained and makes euphotic belt account for more than 70% of fracture thickness size in stretching class flange region.
Described method, wherein, for realizing the requirement of fracture thickness end face entire bright band, reserve the allowance of multiple tracks essence cutting process when billet size designs in step a, then Integral blanking in stepb, then in step c, carry out multiple fine continuously and cut, progressively improve the surface quality of punching press fracture.
Described method, wherein, described high-strength steel is CP800.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the blanking line before improving.
Fig. 2 is the schematic diagram of embodiment of the method decline stockline of the present invention.
Fig. 3 is the close-up schematic view at B place in Fig. 2.
Detailed description of the invention
In aftermentioned embodiment, high-strength steel is CP800, and punch forming part is guide rod.
In order to the feature of the outstanding embodiment of the present invention, the high-strength steel blanking method before improving first is described, as shown in Figure 1, the blanking line of Sheet Metal Forming Technology is as shown in the black lines 1 in figure, and A place is the region of quality of fracture of blank difference, this easily causes flange to ftracture, and has a strong impact on part qualification rate.
As shown in Figures 2 and 3, blanking outline line 2 local outwards expands in the region of quality of fracture of blank difference and increases allowance by new method according to the present invention, in figure 3, blanking outline line 21 is the blanking position before expanding, blanking line 22 is the blanking position after expanding, such as expanding width range W is 1-10mm, so first Integral blanking operation is adopted to carry out stamping-out, then high region B is required at corresponding quality of tube cutting, adopt local essence to cut stamping-out and increase allowance (by blanking line 21, 22 surround), by the excision of reserved allowance, thus raising quality of tube cutting.
Previous embodiment tool has the following advantages:
1. increase key position euphotic belt width, improve quality of tube cutting;
2. parts flanged-edge cracking defect is eliminated, and improves part qualification rate;
3. local finish module simplicity of design, blanking pressure is little, and cutting edge elastic deformation amount is little, and die manufacturing cost is low, and the process-cycle is short.Euphotic belt size can be improved on common press machine, improve the quality of punching press fracture.
Claims (2)
1. improve a method for quality of fracture of blank of high-strength steel, it is characterized in that, be the method that local essence after Integral blanking is cut, comprise the following steps:
In quality of fracture of blank, step a, requires that blanking outline line outwards expands, to increase allowance by higher stretching class flange region in blank design;
Step b, blanking punched to blank entirety, fracture euphotic belt requires to account for fracture thickness 10 ~ 30%, and the euphotic belt in the class flange region that stretches accounts at least 30% of fracture thickness size; And
Step c, local essence is adopted to cut, the allowance stamping-out will increased in stretching class flange region, essence cuts gap 30-50% less of overall blanking punched gap, processing the punching press fracture obtained makes euphotic belt account for more than 70% of fracture thickness size in stretching class flange region, wherein for realizing the requirement of fracture thickness end face entire bright band, reserve the allowance of multiple tracks essence cutting process when billet size designs in step a, then Integral blanking in stepb, then in step c, carry out multiple fine continuously to cut, progressively improve the surface quality of punching press fracture.
2. the method for claim 1, is characterized in that, described high-strength steel is CP800.
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| CN201310062716.XA CN103521592B (en) | 2013-02-27 | 2013-02-27 | Improve the method for quality of fracture of blank of high-strength steel |
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| CN201310062716.XA CN103521592B (en) | 2013-02-27 | 2013-02-27 | Improve the method for quality of fracture of blank of high-strength steel |
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| CN103521592A CN103521592A (en) | 2014-01-22 |
| CN103521592B true CN103521592B (en) | 2015-10-28 |
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| CN104492905A (en) * | 2014-11-27 | 2015-04-08 | 柳州市骏信金属制品有限责任公司 | Method for improving quality of punched member with holes |
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| CN101633114A (en) * | 2009-08-04 | 2010-01-27 | 山东潍坊福田模具有限责任公司 | Processing method for trimming edge of blanking die |
| CN101758147A (en) * | 2009-12-14 | 2010-06-30 | 江西江铃底盘股份有限公司 | Fine cutting and trimming process for auto brake tendon baffle plate and die |
| CN102189168A (en) * | 2010-02-10 | 2011-09-21 | 法因图尔知识产权股份公司 | Method and device for influencing the cut and functional face on fine-blanked finished parts |
| CN102886413A (en) * | 2012-09-28 | 2013-01-23 | 湖北虎牌链条制造有限责任公司 | Precise blanking process for sprocket tooth shape |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS60166128A (en) * | 1984-02-08 | 1985-08-29 | Fujitsu Ltd | Method of shaving work |
| JPS6182936A (en) * | 1984-09-27 | 1986-04-26 | Fujitsu Ltd | Method for improving accuracy of sheared cross section in press work |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101633114A (en) * | 2009-08-04 | 2010-01-27 | 山东潍坊福田模具有限责任公司 | Processing method for trimming edge of blanking die |
| CN101758147A (en) * | 2009-12-14 | 2010-06-30 | 江西江铃底盘股份有限公司 | Fine cutting and trimming process for auto brake tendon baffle plate and die |
| CN102189168A (en) * | 2010-02-10 | 2011-09-21 | 法因图尔知识产权股份公司 | Method and device for influencing the cut and functional face on fine-blanked finished parts |
| CN102886413A (en) * | 2012-09-28 | 2013-01-23 | 湖北虎牌链条制造有限责任公司 | Precise blanking process for sprocket tooth shape |
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