US20100126244A1 - Method for forming high tensile strength metal sheet - Google Patents
Method for forming high tensile strength metal sheet Download PDFInfo
- Publication number
- US20100126244A1 US20100126244A1 US12/324,837 US32483708A US2010126244A1 US 20100126244 A1 US20100126244 A1 US 20100126244A1 US 32483708 A US32483708 A US 32483708A US 2010126244 A1 US2010126244 A1 US 2010126244A1
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- US
- United States
- Prior art keywords
- punch
- htsms
- blank holder
- tensile strength
- high tensile
- 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.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/06—Stamping using rigid devices or tools having relatively-movable die parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
Definitions
- the invention relates to metal sheet forming, more particularly to a technique of bending high tensile strength sheets.
- metals have good strength and flexibility, they are usually used as a structural element requiring strength. When a force applied on a unit area of metal exceeds its tensile strength, the metal will not split like ceramic materials, but will be deformed. That is to say, metals have a property of plasticity, i.e. plastic deformation.
- a power press machine is used for deforming a metal. There is an upper and lower dies in a power press machine. By means of stroke, the metal material being placed between the two dies can be deformed as the shape formed by the dies.
- FIG. 1 illustrates a conventional technique of forming a high tensile strength metal sheet.
- the high tensile metal sheet 10 is placed between an upper die 20 and a lower die 22 .
- a blank holder 24 is used for clamping the sheet 10 .
- the ends 12 of the sheet 10 tend to form an undesired warp or curl (i.e. “recoil”) because of its inner stress against the pressing force.
- the quality of metal sheet forming will be adversely affected.
- element 12 is the desired shape of sheet, but a really resultant shape is like element 12 ′.
- the conventional forming process with post-production includes the steps of: a)forming; b)cutting; c)trimming and d)re-trimming or, a)loading; b)forming; c)re-forming; d)trimming and e)re-trimming. Any of the above processes is lengthy and tardy. The most important point is that pressing veins or scratches will be left on the sheet after various steps. Quality of the finished products will be considerably low unless a finally additional polishing step is performed.
- the steps of forming and trimming must be repeatedly performed. It is very uneconomic. Furthermore, the forming process with multiple forming and trimming steps may also reduce lifetime of the dies. Meanwhile, the formed products will be hardened. It is disadvantageous to the latter process.
- a primary object of the present invention is to provide a method for forming a high tensile strength sheet, which can avoid recoil after the HTSMS is formed.
- An another object of the present invention is to provide a method for forming a high tensile strength sheet, which can shorten the forming process because of avoidance of recoil.
- An another object of the present invention is to provide a method for forming a high tensile strength sheet, which can improve quality of finished products being formed by means of one-time forming.
- the present invention provides a method for forming a high tensile strength metal sheet (HTSMS), which is performed in a power press machine composed of a die, a punch and a blank holder.
- the HTSMS is placed between the die and punch with blank holder.
- a step portion appears at both an outer side of the punch and a pressing portion of the blank holder.
- the step portion is corresponding to a predetermined bent portion of the HTSMS.
- a step will be formed at an edge of the HTSMS by progressively pressing of the step portion to avoid recoil of the HTSMS after forming process.
- the method of the present invention comprises the steps of:
- FIG. 1 illustrates a conventional forming machine for high tensile strength metal sheet (HTSMS);
- FIG. 2 illustrates the HTSMS formed by the machine shown in FIG. 1 ;
- FIG. 3 illustrates the power press machine of the present invention
- FIGS. 4-6 illustrate a series of pressing process using the machine shown in FIG. 3 ;
- FIG. 7 illustrates the HTSMS which is finally formed
- FIG. 8 illustrates another embodiment of the power press machine according to the present invention.
- the high tensile strength metal sheets mentioned in the present invention can be high tensile strength steel sheets made of steel adding several metal elements, such as, but not limited to, niobium, copper, vanadium and titanium.
- the high tensile strength metal sheets increasingly become popular and important for car industry because they have better properties than traditional materials.
- the power press machine applied in the invention includes a punch 32 , a die 30 and a blank holder 34 .
- the die 30 can also be called “female die”. Either the die 30 or the punch 32 is driven by a driving unit 40 to reciprocate upward and downward. The reciprocating motion of the die 30 or the punch 32 can be periodic or multi-staged by a program.
- the die 30 usually has a recess corresponding to the punch 32 . As shown in FIG. 3 , the die 30 and punch 32 are correspondingly recessing and projecting, respectively.
- the blank holder 34 can provide a pressing force onto the high tensile strength metal sheet (hereinafter “HTSMS”) to clamp it when both the die 30 and punch 32 are in motion.
- HTSMS high tensile strength metal sheet
- a feature of the invention is that a step portion S is formed at both the outer side of punch 32 and a pressing portion 34 a of the blank holder 34 .
- the step portions S are arranged near the edge sections 12 which are the predetermined positions to be bent. The distance between one of the edge sections 12 and an adjacent edge is about 5 mm-20 mm.
- a step 14 is formed within the edge sections 12 .
- a gap C is retained between the punch 32 and the blank holder 34 .
- the blank holder 34 shown in the drawings is of a block type. The HTSMS 10 placed on the punch 32 and blank holder 34 is pressed by the die 30 and formed by the step portions S. Therefore, the step 14 is finally formed to avoid recoil of edge of the HTSMS 10 .
- the punch 32 connects to a driving mechanism 40 , for example an oil press, for driving punch 32 to reciprocate.
- a driving mechanism 40 for example an oil press
- FIG. 4 illustrates the beginning of the forming process.
- the blank holder 34 is disposed at a predetermined height which is approximately coplanar with the punch 32 .
- the HTSMS 10 is placed on the plane formed by coplanar punch 32 and blank holder 34 .
- FIG. 5 illustrates the first stage of forming. Blank holder 34 or its pressing portion 34 a can provide a proper pressing force onto the HTSMS 10 to hold it when punch 32 and die 30 perform relative reciprocation.
- the driving mechanism 40 drives punch 32 to ascend to a first position so that the HTSMS 10 becomes roughly deformed.
- the deformed portion is driven by punch 32 to enter die 30 .
- FIG. 6 illustrates the second stage of forming.
- Driving mechanism 40 drives punch 32 to further ascend to a second position so that the HTSMS 10 is sequentially deformed.
- the HTSMS 10 is protruded by ascending punch 32 to progressively reach die 30 .
- Step portion S initially appears.
- FIG. 7 illustrates the third stage of forming.
- Driving mechanism 40 finally drives punch 32 to ascend to a third position so that the HTSMS 10 is completely deformed.
- Edge sections 12 of HTSMS 10 separately form the step 14 by step portions S constituted by punch 32 and blank holder 34 .
- the HTSMS 10 can be sufficiently under pressure during the forming process so that the HTSMS 10 will generate a plastic deformation.
- the step 14 will overbear or offset the recoiling force from edge sections 12 . Accordingly, the formed products can be finished only after steps of cutting and trimming.
- first, second and third positions are shown in separate drawings, but in fact, the ascension of punch 32 driven by driving mechanism 40 is linearly continuous.
- FIG. 8 illustrates another preferred embodiment.
- An adjusting mechanism 36 is preferably disposed at an edge of die 30 .
- the adjusting mechanism 36 is composed of an adjustable screw rod 362 and a block 364 .
- the adjusting mechanism 36 can adjust step portions S between punch 32 and blank holder 34 .
- the positions of step portions S can be adjusted by rotating the screw rod 362 to make block 364 move inward or outward to a specific position. This can change a relative depth of step portions S formed by punch 32 and blank holder 34 .
- adjusting mechanism 36 can match requirements of different thickness, bending angles and/or properties of metal sheets so that the forming process can be preferably completed.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
A method for forming a high tensile strength metal sheet (HTSMS), which is performed in a power press machine composed of a die, a punch and a blank holder, is disclosed. The HTSMS is placed between the die and punch with blank holder. A step portion appears at both an outer side of the punch and a pressing portion of the blank holder. The step portion is corresponding to a predetermined bent portion of the HTSMS. A step will be formed at an edge of the HTSMS by progressively pressing of the step portion to avoid recoil of the HTSMS after forming process.
Description
- The invention relates to metal sheet forming, more particularly to a technique of bending high tensile strength sheets.
- Because metals have good strength and flexibility, they are usually used as a structural element requiring strength. When a force applied on a unit area of metal exceeds its tensile strength, the metal will not split like ceramic materials, but will be deformed. That is to say, metals have a property of plasticity, i.e. plastic deformation. Usually, a power press machine is used for deforming a metal. There is an upper and lower dies in a power press machine. By means of stroke, the metal material being placed between the two dies can be deformed as the shape formed by the dies.
-
FIG. 1 illustrates a conventional technique of forming a high tensile strength metal sheet. The hightensile metal sheet 10 is placed between anupper die 20 and alower die 22. During the pressing process, ablank holder 24 is used for clamping thesheet 10. However, after the pressing action, theends 12 of thesheet 10 tend to form an undesired warp or curl (i.e. “recoil”) because of its inner stress against the pressing force. Thus, the quality of metal sheet forming will be adversely affected. As shown inFIG. 2 ,element 12 is the desired shape of sheet, but a really resultant shape is likeelement 12′. - Moreover, an additional post-production is required because the desired shape can not be accomplished at a time. Therefore, the conventional forming process with post-production includes the steps of: a)forming; b)cutting; c)trimming and d)re-trimming or, a)loading; b)forming; c)re-forming; d)trimming and e)re-trimming. Any of the above processes is lengthy and tardy. The most important point is that pressing veins or scratches will be left on the sheet after various steps. Quality of the finished products will be considerably low unless a finally additional polishing step is performed.
- For example, in order to avoid warps or curls, and to increase accuracy of the products formed, the steps of forming and trimming must be repeatedly performed. It is very uneconomic. Furthermore, the forming process with multiple forming and trimming steps may also reduce lifetime of the dies. Meanwhile, the formed products will be hardened. It is disadvantageous to the latter process.
- A primary object of the present invention is to provide a method for forming a high tensile strength sheet, which can avoid recoil after the HTSMS is formed.
- An another object of the present invention is to provide a method for forming a high tensile strength sheet, which can shorten the forming process because of avoidance of recoil.
- An another object of the present invention is to provide a method for forming a high tensile strength sheet, which can improve quality of finished products being formed by means of one-time forming.
- To accomplish the above-mentioned objects, the present invention provides a method for forming a high tensile strength metal sheet (HTSMS), which is performed in a power press machine composed of a die, a punch and a blank holder. The HTSMS is placed between the die and punch with blank holder. A step portion appears at both an outer side of the punch and a pressing portion of the blank holder. The step portion is corresponding to a predetermined bent portion of the HTSMS. A step will be formed at an edge of the HTSMS by progressively pressing of the step portion to avoid recoil of the HTSMS after forming process.
- By means of the above machine, the method of the present invention comprises the steps of:
- a) setting the blank holder at a predetermined position which is coplanar with the punch, and the high tensile strength metal sheet (HTSMS) being placed on a plane formed by the punch and the blank holder;
- b) driving the punch to ascend to a first position to make the HTSMS roughly deformed;
- c) driving the punch to ascend to a second position to make the HTSMS sequentially deformed; and
- d) driving the punch to ascend to a third position to make the HTSMS finally deformed with a step formed by the step portion.
- The foregoing objects, features, and advantages of the present invention will be discussed in detail in the following non-limiting description of specific embodiments in connection with the accompanying drawings.
-
FIG. 1 illustrates a conventional forming machine for high tensile strength metal sheet (HTSMS); -
FIG. 2 illustrates the HTSMS formed by the machine shown inFIG. 1 ; -
FIG. 3 illustrates the power press machine of the present invention; -
FIGS. 4-6 illustrate a series of pressing process using the machine shown inFIG. 3 ; -
FIG. 7 illustrates the HTSMS which is finally formed; and -
FIG. 8 illustrates another embodiment of the power press machine according to the present invention. - The high tensile strength metal sheets mentioned in the present invention can be high tensile strength steel sheets made of steel adding several metal elements, such as, but not limited to, niobium, copper, vanadium and titanium. The high tensile strength metal sheets increasingly become popular and important for car industry because they have better properties than traditional materials.
- Referring to
FIG. 3 , the power press machine applied in the invention includes apunch 32, a die 30 and ablank holder 34. The die 30 can also be called “female die”. Either thedie 30 or thepunch 32 is driven by adriving unit 40 to reciprocate upward and downward. The reciprocating motion of thedie 30 or thepunch 32 can be periodic or multi-staged by a program. The die 30 usually has a recess corresponding to thepunch 32. As shown inFIG. 3 , the die 30 andpunch 32 are correspondingly recessing and projecting, respectively. Theblank holder 34 can provide a pressing force onto the high tensile strength metal sheet (hereinafter “HTSMS”) to clamp it when both thedie 30 andpunch 32 are in motion. During the forming process, the HTSMS 10 is placed and clamped between theblank holder 34 and die 30, and then thepunch 32 moves toward the HTSMS 10 and finally into thedie 30. - A feature of the invention is that a step portion S is formed at both the outer side of
punch 32 and a pressing portion 34 a of theblank holder 34. The step portions S are arranged near theedge sections 12 which are the predetermined positions to be bent. The distance between one of theedge sections 12 and an adjacent edge is about 5 mm-20 mm. Astep 14 is formed within theedge sections 12. A gap C is retained between thepunch 32 and theblank holder 34. Theblank holder 34 shown in the drawings is of a block type. The HTSMS 10 placed on thepunch 32 andblank holder 34 is pressed by thedie 30 and formed by the step portions S. Therefore, thestep 14 is finally formed to avoid recoil of edge of the HTSMS 10. - Some factors are not considered by the invention, such as the friction between the
blank holder 34 and die 30 or punch 32, and the pressing force from theblank holder 34. Referring toFIGS. 4-6 , thepunch 32 connects to adriving mechanism 40, for example an oil press, for drivingpunch 32 to reciprocate.FIG. 4 illustrates the beginning of the forming process. Theblank holder 34 is disposed at a predetermined height which is approximately coplanar with thepunch 32. TheHTSMS 10 is placed on the plane formed bycoplanar punch 32 andblank holder 34.FIG. 5 illustrates the first stage of forming.Blank holder 34 or its pressing portion 34 a can provide a proper pressing force onto theHTSMS 10 to hold it whenpunch 32 and die 30 perform relative reciprocation. Thedriving mechanism 40 drives punch 32 to ascend to a first position so that theHTSMS 10 becomes roughly deformed. The deformed portion is driven bypunch 32 to enterdie 30.FIG. 6 illustrates the second stage of forming. Drivingmechanism 40 drives punch 32 to further ascend to a second position so that theHTSMS 10 is sequentially deformed. TheHTSMS 10 is protruded by ascendingpunch 32 to progressively reachdie 30. Step portion S initially appears.FIG. 7 illustrates the third stage of forming. Drivingmechanism 40 finally drives punch 32 to ascend to a third position so that theHTSMS 10 is completely deformed.Edge sections 12 of HTSMS 10 separately form thestep 14 by step portions S constituted bypunch 32 andblank holder 34. Therefore, theHTSMS 10 can be sufficiently under pressure during the forming process so that theHTSMS 10 will generate a plastic deformation. After theHTSMS 10 is formed, thestep 14 will overbear or offset the recoiling force fromedge sections 12. Accordingly, the formed products can be finished only after steps of cutting and trimming. - Additionally, the above-mentioned first, second and third positions are shown in separate drawings, but in fact, the ascension of
punch 32 driven by drivingmechanism 40 is linearly continuous. -
FIG. 8 illustrates another preferred embodiment. Anadjusting mechanism 36 is preferably disposed at an edge ofdie 30. Theadjusting mechanism 36 is composed of anadjustable screw rod 362 and ablock 364. Theadjusting mechanism 36 can adjust step portions S betweenpunch 32 andblank holder 34. The positions of step portions S can be adjusted by rotating thescrew rod 362 to make block 364 move inward or outward to a specific position. This can change a relative depth of step portions S formed bypunch 32 andblank holder 34. Thus, adjustingmechanism 36 can match requirements of different thickness, bending angles and/or properties of metal sheets so that the forming process can be preferably completed. - Such alterations, modifications, and improvements are intended to be part of this disclosure, and are intended to be within the spirit and the scope of the present invention. Accordingly, the foregoing description is by way of example only and is not intended to be limiting. The present invention is limited only as defined in the following claims and the equivalents thereto.
Claims (2)
1. A method for forming a high tensile strength metal sheet, which is performed in a power press machine composed of a die, a punch and a blank holder, wherein a step portion appears at both an outer side of the punch and a pressing portion of the blank holder, the method comprising the steps of:
a) setting the blank holder at a predetermined position which is coplanar with the punch, and the high tensile strength metal sheet (HTSMS) being placed on a plane formed by the punch and the blank holder;
b) driving the punch to ascend to a first position to make the HTSMS roughly deformed;
c) driving the punch to ascend to a second position to make the HTSMS sequentially deformed; and
d) driving the punch to ascend to a third position to make the HTSMS finally deformed with a step formed by the step portion.
2. The method for forming a high tensile strength metal sheet as claim 1 , wherein the steps b), c) and d) are continuously performed.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/324,837 US20100126244A1 (en) | 2008-11-27 | 2008-11-27 | Method for forming high tensile strength metal sheet |
US13/304,710 US8857237B2 (en) | 2008-11-27 | 2011-11-28 | Method for forming high-strength steel into a C-shape |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US12/324,837 US20100126244A1 (en) | 2008-11-27 | 2008-11-27 | Method for forming high tensile strength metal sheet |
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US13/304,710 Continuation-In-Part US8857237B2 (en) | 2008-11-27 | 2011-11-28 | Method for forming high-strength steel into a C-shape |
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US20100126244A1 true US20100126244A1 (en) | 2010-05-27 |
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US12/324,837 Abandoned US20100126244A1 (en) | 2008-11-27 | 2008-11-27 | Method for forming high tensile strength metal sheet |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014166839A1 (en) * | 2013-04-10 | 2014-10-16 | Thyssenkrupp Steel Europe Ag | Method and compression tool for producing highly dimensionally stable half shells |
US20150020561A1 (en) * | 2012-02-02 | 2015-01-22 | Shinohara Press Service Co., Ltd. | Method of manufacturing end-group components with pure niobium material for superconducting accelerator cavity |
WO2015194401A1 (en) * | 2014-06-16 | 2015-12-23 | Jfeスチール株式会社 | Cold press forming method |
JPWO2015002077A1 (en) * | 2013-07-03 | 2017-02-23 | 新日鐵住金株式会社 | Press molding apparatus and press molding method |
JP2018034176A (en) * | 2016-08-30 | 2018-03-08 | Jfeスチール株式会社 | Method for manufacturing press-molded product |
US20200340247A1 (en) * | 2019-04-23 | 2020-10-29 | Epic Metals Corporation | Roof Deck |
CN118002691A (en) * | 2024-04-09 | 2024-05-10 | 江苏南方精工股份有限公司 | Stamping method and die for bending and stretching products |
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US5168741A (en) * | 1990-11-20 | 1992-12-08 | Braunheim Stephen T | Method for forming a leading edge cover for jet engine blades |
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US5778722A (en) * | 1994-02-15 | 1998-07-14 | Toyo Seikan Kaisha, Ltd. | Method of producing seamless cans |
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US5626049A (en) * | 1985-03-15 | 1997-05-06 | Weirton Steel Corporation | Draw-process systems for fabricating one-piece can bodies |
US5168741A (en) * | 1990-11-20 | 1992-12-08 | Braunheim Stephen T | Method for forming a leading edge cover for jet engine blades |
US5778722A (en) * | 1994-02-15 | 1998-07-14 | Toyo Seikan Kaisha, Ltd. | Method of producing seamless cans |
US7334447B1 (en) * | 2005-02-28 | 2008-02-26 | Cessna Aircraft Company | Nacelle nose cap forming method and apparatus |
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150020561A1 (en) * | 2012-02-02 | 2015-01-22 | Shinohara Press Service Co., Ltd. | Method of manufacturing end-group components with pure niobium material for superconducting accelerator cavity |
US9502631B2 (en) * | 2012-02-02 | 2016-11-22 | Shinohara Press Service Co., Ltd. | Method of manufacturing end-group components with pure niobium material for superconducting accelerator cavity |
WO2014166839A1 (en) * | 2013-04-10 | 2014-10-16 | Thyssenkrupp Steel Europe Ag | Method and compression tool for producing highly dimensionally stable half shells |
CN105307790A (en) * | 2013-04-10 | 2016-02-03 | 蒂森克虏伯钢铁欧洲股份公司 | Method and compression tool for producing highly dimensionally stable half shells |
US10081043B2 (en) | 2013-04-10 | 2018-09-25 | Thyssenkrupp Steel Europe Ag | Method and upsetting tool for producing highly dimensionally accurate half shells |
JPWO2015002077A1 (en) * | 2013-07-03 | 2017-02-23 | 新日鐵住金株式会社 | Press molding apparatus and press molding method |
WO2015194401A1 (en) * | 2014-06-16 | 2015-12-23 | Jfeスチール株式会社 | Cold press forming method |
JP2018034176A (en) * | 2016-08-30 | 2018-03-08 | Jfeスチール株式会社 | Method for manufacturing press-molded product |
US20200340247A1 (en) * | 2019-04-23 | 2020-10-29 | Epic Metals Corporation | Roof Deck |
CN118002691A (en) * | 2024-04-09 | 2024-05-10 | 江苏南方精工股份有限公司 | Stamping method and die for bending and stretching products |
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