Stamping parts common problem handling

Categories:Corporate
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Time of issue:2019-09-17 15:34
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(Summary description)1,adhesion,scratches:duetothematerialrubbingwiththepunchordietoappearonthesurfaceoftheworkpieceormold;2,burr:mainlyoccursintheshearingdieandblankingdie,thegapbetweenthecuttingedgeorlargeorsmallwillproduceburrs;3,lineoffset:whenthepartisformed,thepartthatfirstcontactsthemoldissqueezedandformsaline;4,convexandconcave:theunwindinglinehasforeignmatter(ironfilings,rubber,dust)mixedintotheconvexandconcave;5,zigzag:duetounevenstress,poordrawbeadmatchingorpoorcontrolofthesliderofthepress,etc.,causingtortuosityandstrainofther-angleorembossedpartoftheworkpiece;6,wrinkles:duetopooradjustmentofthesliderofthepress,lowprecisionofthepress,improperadjustmentoftheaircushionpressure,largepunchorrpartscausedbywrinklesattheedgeorr.7.Otherspecificproblems:Indailyproduction,therewillbecaseswherethepunchingsizeistoolargeortoosmall(mayexceedthespecification)andthedifferencefromthesizeofthepunchislarge,exceptforthedesigndimensionsoftheformingconvexandconcavemolds.Inadditiontofactorssuchasmachiningaccuracyandblankingclearance,itshouldbeconsideredfromthefollowingaspects.(1).Whenthecuttingedgeisworn,thetensilestressofthematerialincreases,andthetendencyofthestampingpartstoturnandtwistisincreased.Whenthematerialisturned,thepunchsizewillbecomesmaller.(2).Thestrongpressureonthematerialcausesplasticdeformationofthematerial,whichwillleadtoalargerpunchingsize.Whenthestrongpressureisreduced,thepunchingsizewillbecomesmaller.(3).Theshapeoftheendofthepunchedge.Iftheendportionischamferedorcurved,thepunchingforceislesslikelytocauseturningandtwistingduetotheslowingofthepunchingforce,andtherefore,thepunchingsizewillbecomelarger.Whentheendofthepunchisflat(nobevelorarc),thepunchsizewillberelativelysmall.8.Methodforsuppressingtheturningandtwistingofstampingparts(1).Reasonablemolddesign.Intheprogressivedie,thearrangementoftheblankingsequencemayaffecttheaccuracyoftheformingofthestamping.Fortheblankingofthesmallpartsofthestampingparts,generally,alargeareaofpunchingandcuttingisarranged,andthenasmallareaofpunchingandcuttingisarrangedtoreducetheinfluenceofthepunchingforceontheformingofthestampingparts.(2).Squeezethematerial.Overcomingthetraditionalmolddesignstructure,thematerialgapisopenedontheunloadingplate(thatis,whenthemoldisclosed,thematerialcanbecompacted.Thekeyformingpart,theunloadingplatemustbemadeintoaninlaidstructuretofacilitatethelongsolutionThetimestampingcausesthegrinding(pressure)lossgeneratedatthepressingportionoftheunloadingplate,andthematerialcannotbepressed.(3).Addastrongpressurefunction.Thatis,thethickeningsizeofthepressingportionoftheunloadinginsert(normalunloadinginsertthicknessH+0.03mm)isusedtoincreasethepressureonthematerialoftheconcavemoldside,therebysuppressingtheturningandtwistingdeformationofthestampingpartduringpunching.(4).Theendofthepunchedgeistrimmedorcurved.Thisisaneffectivewaytoreducethebufferingpower.Byreducingthecushioningforce,thetensileforceonthematerialoftheconcavemoldsidecanbealleviated,therebysuppressingtheeffectofturningandtwistingthestampingpart.(5).Inthedailymoldproduction,attentionshouldbepaidtomaintainingthesharpnessofthepunchingandconcavedieedge.Whentheblankingedgeisworn,thetensilestressofthematerialwillincrease,andthetendencyofthestampingparttoturnandtwistwillincrease.(6).Unreasonablepunchinggaporunevengapisalsothecauseoftheturningandtwistingofthestampingparts,whichneedstobeovercome.

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Stamping parts common problem handling

(Summary description)1,adhesion,scratches:duetothematerialrubbingwiththepunchordietoappearonthesurfaceoftheworkpieceormold;2,burr:mainlyoccursintheshearingdieandblankingdie,thegapbetweenthecuttingedgeorlargeorsmallwillproduceburrs;3,lineoffset:whenthepartisformed,thepartthatfirstcontactsthemoldissqueezedandformsaline;4,convexandconcave:theunwindinglinehasforeignmatter(ironfilings,rubber,dust)mixedintotheconvexandconcave;5,zigzag:duetounevenstress,poordrawbeadmatchingorpoorcontrolofthesliderofthepress,etc.,causingtortuosityandstrainofther-angleorembossedpartoftheworkpiece;6,wrinkles:duetopooradjustmentofthesliderofthepress,lowprecisionofthepress,improperadjustmentoftheaircushionpressure,largepunchorrpartscausedbywrinklesattheedgeorr.7.Otherspecificproblems:Indailyproduction,therewillbecaseswherethepunchingsizeistoolargeortoosmall(mayexceedthespecification)andthedifferencefromthesizeofthepunchislarge,exceptforthedesigndimensionsoftheformingconvexandconcavemolds.Inadditiontofactorssuchasmachiningaccuracyandblankingclearance,itshouldbeconsideredfromthefollowingaspects.(1).Whenthecuttingedgeisworn,thetensilestressofthematerialincreases,andthetendencyofthestampingpartstoturnandtwistisincreased.Whenthematerialisturned,thepunchsizewillbecomesmaller.(2).Thestrongpressureonthematerialcausesplasticdeformationofthematerial,whichwillleadtoalargerpunchingsize.Whenthestrongpressureisreduced,thepunchingsizewillbecomesmaller.(3).Theshapeoftheendofthepunchedge.Iftheendportionischamferedorcurved,thepunchingforceislesslikelytocauseturningandtwistingduetotheslowingofthepunchingforce,andtherefore,thepunchingsizewillbecomelarger.Whentheendofthepunchisflat(nobevelorarc),thepunchsizewillberelativelysmall.8.Methodforsuppressingtheturningandtwistingofstampingparts(1).Reasonablemolddesign.Intheprogressivedie,thearrangementoftheblankingsequencemayaffecttheaccuracyoftheformingofthestamping.Fortheblankingofthesmallpartsofthestampingparts,generally,alargeareaofpunchingandcuttingisarranged,andthenasmallareaofpunchingandcuttingisarrangedtoreducetheinfluenceofthepunchingforceontheformingofthestampingparts.(2).Squeezethematerial.Overcomingthetraditionalmolddesignstructure,thematerialgapisopenedontheunloadingplate(thatis,whenthemoldisclosed,thematerialcanbecompacted.Thekeyformingpart,theunloadingplatemustbemadeintoaninlaidstructuretofacilitatethelongsolutionThetimestampingcausesthegrinding(pressure)lossgeneratedatthepressingportionoftheunloadingplate,andthematerialcannotbepressed.(3).Addastrongpressurefunction.Thatis,thethickeningsizeofthepressingportionoftheunloadinginsert(normalunloadinginsertthicknessH+0.03mm)isusedtoincreasethepressureonthematerialoftheconcavemoldside,therebysuppressingtheturningandtwistingdeformationofthestampingpartduringpunching.(4).Theendofthepunchedgeistrimmedorcurved.Thisisaneffectivewaytoreducethebufferingpower.Byreducingthecushioningforce,thetensileforceonthematerialoftheconcavemoldsidecanbealleviated,therebysuppressingtheeffectofturningandtwistingthestampingpart.(5).Inthedailymoldproduction,attentionshouldbepaidtomaintainingthesharpnessofthepunchingandconcavedieedge.Whentheblankingedgeisworn,thetensilestressofthematerialwillincrease,andthetendencyofthestampingparttoturnandtwistwillincrease.(6).Unreasonablepunchinggaporunevengapisalsothecauseoftheturningandtwistingofthestampingparts,whichneedstobeovercome.

Categories:Corporate
Author:
Origin:
Time of issue:2019-09-17 15:34
Views:

1, adhesion, scratches: due to the material rubbing with the punch or die to appear on the surface of the workpiece or mold;

2, burr: mainly occurs in the shearing die and blanking die, the gap between the cutting edge or large or small will produce burrs;

3, line offset: when the part is formed, the part that first contacts the mold is squeezed and forms a line;

4, convex and concave: the unwinding line has foreign matter (iron filings, rubber, dust) mixed into the convex and concave;

5, zigzag: due to uneven stress, poor drawbead matching or poor control of the slider of the press, etc., causing tortuosity and strain of the r-angle or embossed part of the workpiece;

6, wrinkles: due to poor adjustment of the slider of the press, low precision of the press, improper adjustment of the air cushion pressure, large punch or r parts caused by wrinkles at the edge or r.

7. Other specific problems: In daily production, there will be cases where the punching size is too large or too small (may exceed the specification) and the difference from the size of the punch is large, except for the design dimensions of the forming convex and concave molds. In addition to factors such as machining accuracy and blanking clearance, it should be considered from the following aspects.

(1). When the cutting edge is worn, the tensile stress of the material increases, and the tendency of the stamping parts to turn and twist is increased. When the material is turned, the punch size will become smaller.

(2). The strong pressure on the material causes plastic deformation of the material, which will lead to a larger punching size. When the strong pressure is reduced, the punching size will become smaller.

(3). The shape of the end of the punch edge. If the end portion is chamfered or curved, the punching force is less likely to cause turning and twisting due to the slowing of the punching force, and therefore, the punching size will become larger. When the end of the punch is flat (no bevel or arc), the punch size will be relatively small.

8. Method for suppressing the turning and twisting of stamping parts

(1). Reasonable mold design. In the progressive die, the arrangement of the blanking sequence may affect the accuracy of the forming of the stamping. For the blanking of the small parts of the stamping parts, generally, a large area of punching and cutting is arranged, and then a small area of punching and cutting is arranged to reduce the influence of the punching force on the forming of the stamping parts.

(2). Squeeze the material. Overcoming the traditional mold design structure, the material gap is opened on the unloading plate (that is, when the mold is closed, the material can be compacted. The key forming part, the unloading plate must be made into an inlaid structure to facilitate the long solution The time stamping causes the grinding (pressure) loss generated at the pressing portion of the unloading plate, and the material cannot be pressed.

(3). Add a strong pressure function. That is, the thickening size of the pressing portion of the unloading insert (normal unloading insert thickness H+0.03 mm) is used to increase the pressure on the material of the concave mold side, thereby suppressing the turning and twisting deformation of the stamping part during punching.

(4). The end of the punch edge is trimmed or curved. This is an effective way to reduce the buffering power. By reducing the cushioning force, the tensile force on the material of the concave mold side can be alleviated, thereby suppressing the effect of turning and twisting the stamping part.

(5). In the daily mold production, attention should be paid to maintaining the sharpness of the punching and concave die edge. When the blanking edge is worn, the tensile stress of the material will increase, and the tendency of the stamping part to turn and twist will increase.

(6). Unreasonable punching gap or uneven gap is also the cause of the turning and twisting of the stamping parts, which needs to be overcome.

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