CN103521592A - Method for improving quality of fracture of blank of high-strength steel - Google Patents
Method for improving quality of fracture of blank of high-strength steel Download PDFInfo
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- CN103521592A CN103521592A CN201310062716.XA CN201310062716A CN103521592A CN 103521592 A CN103521592 A CN 103521592A CN 201310062716 A CN201310062716 A CN 201310062716A CN 103521592 A CN103521592 A CN 103521592A
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Abstract
The invention aims to provide a method for improving quality of a fracture of blank of high-strength steel. In order to achieve the method for improving quality of the fracture of the blank of the high-strength steel, the local accurate cutting method after whole blanking comprises the following steps that a, a contour line of the blank in a stretching turnup area where has the high requirement for the quality of the fracture of the blank is expanded outwards in blank design, so that working allowance is increased; b, whole punching blanking is conducted on the blank, an euphotic zone of the fracture is required to account for 10-30% of the thickness of the fracture, and the part, in the stretching turnup area, of the euphotic zone accounts for at least 30% of the thickness of the fracture; c, local accurate cutting is conducted, the increased working allowance is blanked in the stretching turnup area, a gap produced by accurate cutting is 30-50% smaller than a gap produced by whole punching blanking, and according to the punched fracture obtained through machining, the euphotic zone accounts for more than 70% of the thickness of the fracture in the stretching turnup area.
Description
Technical field
The present invention relates to Sheet Metal Forming Technology, relate in particular 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 at present chassis and connects component of rod category.The process of connecting rod part mainly adopts stamping operation, extends class flange in part.This process form is in forming process, and the continuous attenuate of thickness by stamping blanks is realized the distortion radially.When correlative study shows to be shaped, the surface quality of thickness end face has close contacting when the limit of even thickness attenuate and stamping and blanking, and during blanking, more even thickness reduction is larger for thickness end face euphotic belt, and stretching class flange deformation extent is also larger.
CP800 material, tensile strength surpasses 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 that produces cracking in follow-up shaping, overturning process.
The existing method about raising thickness end face euphotic belt size mainly contains following several method:
One, when blanking punched, integral body reduces blade clearance, improves euphotic belt size.Blanking gap (punch-die cutting edge gap) size is inversely proportional to end face euphotic belt size; Cutting edge gap length and blanking pressure size are also inversely proportional to simultaneously.Therefore along with gap reduces, stamping press significantly promotes, economy variation.And for connecting rod part, the thickness requirement of euphotic belt is not on whole girth, often concentrates on local location, improve in therefore whole gap is also the waste that control ability drops into;
When two, blanking punched, at local location, reduce punching press gap, improve the euphotic belt size of local location.This method is that different blanking gaps is used in design on blanking die, in the region of stretching class flange, uses little blanking gap, uses large blanking gap in other regions.Because gap variation causes the distribution of blanking pressure, be inhomogeneous, especially, for the asymmetric component of rod category that connects of shape, under inhomogeneous stressing conditions, can cause course of work intermediate gap unstable.Cannot guarantee the requirement of euphotic belt thickness.And local blanking gap of being strict with also causes Design of Dies, manufacturing cost significantly to rise;
Three, the method that essence is rushed blanking realizes the method for full euphotic belt.Use in addition special fine blanking technology, can improve the surface quality of end surface thickness, but have certain limitation for product size size.And improved 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, invent a kind of method that improves high-strength steel blanking quality of tube cutting, on common press machine, realize local fine blanking technology, improve blanking quality of tube cutting.
Summary of the invention
The object of the present invention is to provide a kind of method that improves high-strength steel blanking quality of tube cutting.
For realizing the method for the raising high-strength steel blanking quality of tube cutting of described object, the method for local essence is cut after Integral blanking, comprises the following steps:
Step a, the stretching class flange region of having relatively high expectations at blanking quality of tube cutting in blank design outwards expands blanking outline line, to increase allowance;
Step b, blanking punched to blank integral body, fracture euphotic belt requires to account for fracture thickness 10～30%, and the euphotic belt in stretching class flange region accounts at least 30% of fracture thickness size; And
Step c, adopt local essence to cut, in stretching class flange region, by the allowance stamping-out increasing, essence is cut the whole blanking punched little 30-50% in gap of Gap-Ratios, and the punching press fracture that processing obtains makes euphotic belt account for the more than 70% of fracture thickness size in stretching class flange region.
Described method, wherein, for realizing the requirement of the full euphotic belt of fracture thickness end face, in step a, when designing, billet size reserves the allowance of multiple tracks essence cutting process, follow Integral blanking in step b, then in step c, carry out continuously multiple fine 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 local enlarged diagram at B place in Fig. 2.
The specific embodiment
In aftermentioned embodiment, high-strength steel is CP800, and punch forming part is guide rod.
For the feature of the outstanding embodiment of the present invention, the high-strength steel blanking method before improving is first 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 poor region of blanking quality of tube cutting, this easily causes flange cracking, has a strong impact on part qualification rate.
As shown in Figures 2 and 3, new method according to the present invention increases allowance in the poor region of blanking quality of tube cutting by local outwards expansion of blanking outline line 2, in Fig. 3, blanking outline line 21 is the blanking position before expanding, blanking line 22 is the blanking position after expanding, for example expanding width range W is 1-10mm, so first, adopt Integral blanking operation to carry out stamping-out, then at corresponding quality of tube cutting, require high region B, adopt local essence to cut stamping-out and increase allowance (by blanking line 21, 22 surround), by reserved allowance excision, thereby 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.Can on common press machine, improve euphotic belt size, improve the quality of punching press fracture.
Claims (3)
1. a method that improves high-strength steel blanking quality of tube cutting, is characterized in that, the method for local essence is cut after Integral blanking, comprises the following steps:
Step a, the stretching class flange region of having relatively high expectations at blanking quality of tube cutting in blank design outwards expands blanking outline line, to increase allowance;
Step b, blanking punched to blank integral body, fracture euphotic belt requires to account for fracture thickness 10～30%, and the euphotic belt in stretching class flange region accounts at least 30% of fracture thickness size; And
Step c, adopt local essence to cut, in stretching class flange region, by the allowance stamping-out increasing, essence is cut the whole blanking punched little 30-50% in gap of Gap-Ratios, and the punching press fracture that processing obtains makes euphotic belt account for the more than 70% of fracture thickness size in stretching class flange region.
2. the method for claim 1, it is characterized in that, for realizing the requirement of the full euphotic belt of fracture thickness end face, in step a, when designing, billet size reserves the allowance of multiple tracks essence cutting process, follow Integral blanking in step b, then in step c, carry out continuously multiple fine and cut, progressively improve the surface quality of punching press fracture.
3. the method for claim 1, is characterized in that, described high-strength steel is CP800.
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| Application Number | Priority Date | Filing Date | Title |
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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 true CN103521592A (en) | 2014-01-22 |
| CN103521592B CN103521592B (en) | 2015-10-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| 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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| 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 |
| 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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| 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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