3 Fundamentals of press design

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334 Sheet metal forming and blanking slide stroke [mm] supplementary functions TDC BDC BDC time [s] Fig. 4.7.4 Supplementary forces and functions during the slide stroke rapid closing stroke tracing stroke blanking stroke rapid return travel stroke time [s] movement sequence vee-ring piston movement sequence counterforce piston cycle for removal/air jet ejection of parts and scrap feed cycle of the punched material scrap seperator cycle Blanking force-stroke diagram Figure 4.7.5 compares the variation of the blanking force over the slide stroke or the time required for normal blanking to that required for fine blanking. During normal blanking, the sheet metal is initially elastically deformed on impact of the blanking punch (I) and then cut (II). In phase III, the part tears through, and in phase IV the system vibrations in the machine and die decay in all three directions (cf. Fig. 4.5.1). This is the phase in which the greatest die wear takes place. During fine blanking, the tearing and the vibration phases are eliminated. The special process parameters involved in fine blanking prevent the sudden breakthrough of the part, ensuring a smooth cut over the entire sheet metal thickness. Blanking clearance The blanking clearance is the dimensional difference or gap between the blanking punch and the blanking die measured on a single side. Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998
Fine blanking blanking force F s I II F s max FAbriß time[s], stroke[mm] Fig. 4.7.5 Press force-stroke curves for standard and fine blanking III IV The smooth section of the cut surface and the blanking clearance are closely related: the greater the blanking clearance, the lower the smooth cut proportion. In addition to its size, the uniformity of the gap along the part contour is also important. The gap should remain constant when subjected to load during the blanking operation. The size of the blanking clearance is primarily determined by the sheet metal thickness to be cut, but also by the nature and strength of the workpiece material. In contrast to the blanking clearance occurring during standard blanking of around 5 to 10% of the sheet metal thickness, the corresponding value for fine blanking lies at around 0.5% (Fig. 4.7.6). In certain cases, the blanking clearance can also vary over the part contour. Parts with toothing, for example, are manufactured with a blanking clearance which is greater in the area of the tooth root than it is at the tooth tip. Vee-ring The vee-ring is a characteristic feature of fine blanking dies. It runs in the form of a raised serrated jag at a defined distance from the blanking line and is pressed into the scrap web. Its function is to hold the punched material outside the blanking line and so prevent lateral flow of the material during the blanking process. In addition, it serves to apply compressive stress to the sheet metal, so improving the flow process. To simplify maintenance, where sheet metal thicknesses of up to 4.5mm are being processed, the vee-ring is mounted on the pressure Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998 fine blanking standard blanking 335
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Metal Forming Handbook /Schuler (c)
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123 METAL FORMING Metal Forming Han
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Preface Following the long traditio
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Contributors ADAM, K., Dipl.-Ing. (
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Contents Index of formula symbols .
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Contents 3.6.5 Measures to be under
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Contents 5.3 Component development
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Index of formula symbols � rib an
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Index of formular symbols d inner d
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Index of formular symbols p G avera
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1 Introduction Technology has exert
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Introduction Fig. 1.1 L. Schuler, M
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2 Basic principles of metal forming
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Methods of forming and cutting tech
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2 Basic principles of metal forming
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Basic terms in which � 1 is defor
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Basic terms cation of an exterior f
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Basic terms fracture, this characte
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3 Fundamentals of press design 3.1
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Press types and press construction
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Mechanical presses , distance s[m]
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Mechanical presses stress on the fr
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Mechanical presses stroke [mm] 900
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Mechanical presses This offers a nu
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Mechanical presses or bottom mounte
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Mechanical presses In crossbar tran
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Mechanical presses with a long serv
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Mechanical presses Fig. 3.2.9 Drive
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Mechanical presses Overload safety
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Mechanical presses Slide cushion So
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Mechanical presses imum pneumatic p
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Hydraulic presses Design of the dri
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Hydraulic presses pumps suspended i
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Hydraulic presses pressure in the p
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Hydraulic presses F 4 I P (F ) max
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Hydraulic presses are two variation
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Hydraulic presses presscrown retain
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Changing dies to a weight of 3 t pr
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Changing dies gearwithguidinggroove
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Changing dies are changed in solid
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Changing dies hydraulic clamping me
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Press control systems 3.5.3 Operati
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Press control systems 3.5.4 Structu
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Press control systems The communica
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Press control systems Fig. 3.5.5 PL
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Press control systems Fig. 3.5.7 Sw
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Press control systems Other approac
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Press safety and certification 3.6.
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Press safety and certification with
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Press safety and certification - st
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Press safety and certification Manu
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Press safety and certification pres
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Press safety and certification 3.6.
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Press safety and certification tion
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Casting components for presses Fig.
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4 Sheet metal forming and blanking
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Principles of die manufacture icall
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Principles of die manufacture becau
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Principles of die manufacture go-ah
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Principles of die manufacture produ
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Principles of die manufacture Fig.
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Principles of die manufacture a b c
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Principles of die manufacture the p
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Metal Forming Handbook / Schuler (c
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Principles of die manufacture 0.00
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Principles of die manufacture blank
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Principles of die manufacture how i
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Principles of die manufacture spott
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Deep drawing and stretch drawing me
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Deep drawing and stretch drawing In
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Deep drawing and stretch drawing ac
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Deep drawing and stretch drawing 3
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Deep drawing and stretch drawing 20
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Deep drawing and stretch drawing β
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Deep drawing and stretch drawing Ex
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Deep drawing and stretch drawing Bl
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Deep drawing and stretch drawing bl
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Deep drawing and stretch drawing Ta
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Deep drawing and stretch drawing Au
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Deep drawing and stretch drawing Ti
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Deep drawing and stretch drawing Hi
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Deep drawing and stretch drawing -
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Deep drawing and stretch drawing -
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Deep drawing and stretch drawing se
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Deep drawing and stretch drawing fo
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Deep drawing and stretch drawing pu
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Deep drawing and stretch drawing ag
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Coil lines Fig. 4.3.1 Coil line for
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Coil lines Fig. 4.3.3 Compact desig
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Sheet metal forming lines In the ca
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Sheet metal forming lines Fig. 4.4.
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Sheet metal forming lines ing of th
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Sheet metal forming lines (Fig. 4.4
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Sheet metal forming lines The two l
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Sheet metal forming lines 1,860mm a
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Sheet metal forming lines ver’s c
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Sheet metal forming lines During th
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Sheet metal forming lines 4.4.4 Des
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Sheet metal forming lines individua
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Sheet metal forming lines As early
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Sheet metal forming lines In modern
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Sheet metal forming lines 4.4.6 Tra
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Sheet metal forming lines protects
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Sheet metal forming lines Within th
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Sheet metal forming lines power req
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Sheet metal forming lines Press lay
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Sheet metal forming lines higher st
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Sheet metal forming lines Draw cush
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Sheet metal forming lines These com
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Sheet metal forming lines motion cu
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Sheet metal forming lines increase
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Sheet metal forming lines (cf. Fig.
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Sheet metal forming lines larly str
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Sheet metal forming lines ing parts
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Sheet metal forming lines - efficie
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Sheet metal forming lines - Automat
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Sheet metal forming lines Local ope
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Sheet metal forming lines modules a
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Sheet metal forming lines Table 4.4
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Sheet metal forming lines sion foll
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Blanking processes to complete brea
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Blanking processes Fig. 4.5.5 Top-t
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Blanking processes 56.8% 65.0% 67.4
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Blanking processes a configuration
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Blanking processes flat punch U bev
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Blanking processes Using these equa
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Blanking processes x S = 66. 6 (s a
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Page 305 and 306: Shearing lines Fig. 4.6.1 Slitting
Page 307 and 308: Shearing lines The blanking process
Page 309 and 310: Shearing lines Blanking presses for
Page 311 and 312: Shearing lines 4.6.3 High-speed bla
Page 313 and 314: Shearing lines mass counterbalance
Page 315 and 316: Shearing lines Fig. 4.6.9 Influence
Page 317 and 318: Shearing lines Fig. 4.6.11 Rotor an
Page 319 and 320: Shearing lines Fig. 4.6.13 Complete
Page 321 and 322: Shearing lines Fig. 4.6.15 Complete
Page 323 and 324: Shearing lines Fig. 4.6.17 Flexible
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Bending Fig. 4.8.25 Roller straight
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Bending W W t t W Wma s Fig. 4.8.28
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4 Sheet metal forming and blanking
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Organization of stamping plants Whe
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Organization of stamping plants Tab
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Organization of stamping plants lic
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Organization of stamping plants bat
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Organization of stamping plants Tab
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Organization of stamping plants ele
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Organization of stamping plants une
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5 Hydroforming 5.1 General One of t
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Process technology and example appl
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5 Hydroforming 5.3 Component develo
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Component development a component d
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Component development 100% D D 75%
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Component development Pure expansio
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Die engineering diameter and stroke
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5 Hydroforming 5.5 Materials and pr
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Materials and preforms for producin
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Presses for hydroforming Controllab
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5 Hydroforming 5.7 General consider
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General considerations inward hole
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6 Solid forming (Forging) 6.1 Gener
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General lets that can be produced t
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General Fig. 6.1.4 Examples of coin
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General Table 6.1.1: Comparison bet
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6 Solid forming (Forging) 6.2 Benef
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Benefits of solid forming 6.2.2 Wor
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Benefits of solid forming range”
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Benefits of solid forming sions fro
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Benefits of solid forming Where no
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Materials, billet production and su
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Formed part and process plan requir
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Formed part and process plan 6.4.2
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6 Solid forming (Forging) 6.5 Force
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Force and work requirement d 0 d 2
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Force and work requirement For die
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Force and work requirement The mini
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Force and work requirement dies) (c
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Part transfer There is a broad rang
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Part transfer For cold forming proc
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6 Solid forming (Forging) 6.7 Die d
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Die design wedge adjustment auxilia
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Die design Table 6.7.1: Modular sys
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Die design Fig. 6.7.5 Shearing die
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Die design for radial stress � r
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Die design The off-center applied f
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Die design Table 6.7.4: Heat treatm
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Die design Powder metal-manufacture
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Die design ledeburitic 12 % chromiu
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Die design system integrated into b
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6 Solid forming (Forging) 6.8 Press
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Presses used for solid forming mult
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Presses used for solid forming slid
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Presses used for solid forming Fig.
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Presses used for solid forming duct
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Presses used for solid forming 6.8.
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Presses used for solid forming tati
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Presses used for solid forming adeq
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Presses used for solid forming Embo
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Presses used for solid forming ment
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Presses used for solid forming feed
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Presses used for solid forming hopp
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Presses used for solid forming coin
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Presses used for solid forming Univ
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Presses used for solid forming Meda
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Presses used for solid forming CNC-
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Presses used for solid forming forc
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Index A.S.T.M.-standard 451 abrasio
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Index cylinder -, counterpressure 4
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Index flying shear 288 flywheel 51-
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Index modified top drive 205-207 mo
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Index sand blasting 460 sandwich co
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Index washing/cleaning machine 219
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3 Fundamentals of press design

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