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Lebensdauer Normalien2003 Gb

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Christer Lindholm
Christer Lindholm

The document discusses factors that impact tool life and downtime in toolrooms. It identifies the guide element as the most important factor in maintaining the proper position between the punch and die during cutting or bending processes. It recommends using precision sintered ferrite or roller guides to reduce side forces from the press and increase tool life. Precision production tolerances for guides and bushings can be paired to customer demands.

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Today‘s Target in Toolrooms
reducing downtimes reducing maintainance getting longer toolife longer cycletimes between resharpening in total: getting cost‘s down
Searching the problems and first action is: using better material for punches using better material for dies coating punches and dies What will be done for this
why is it done like this everyone can see here is something to do but is this all no there are more important factors as the press itself the guiding systems
the press itself gives unequal sideforces to the tool Forces comming from the press ram are high and unequal, who knows the datas from the parallissm of the press ram to the press table? Theses things are not taken under consideration because most times unknown!
Press forces occure reduction of tool life Who knows the existing situation of the press guides? Maintainance or responsible people say they know but if you ask for real datas they can not be found. And even if they have they can not do anything against it.
but the main and most important factor is the guide element
All forces are going to the guidelement no matter they are occured from the press or from the cutting or bending forces from the tool the guide element is responsible to hold the position between punch and die during cutting or bending process
Superfinished Guide Pillars High Precision Ball Bearing Guides High Precision Roller Guides Precision Sintered Ferrite Guides
FIBRO Sintered Ferrite Guides high stiffness good emergency running properties high precision guide tolerances consits 20% of pores, vacum filled with oil able to keep side forces max. velocity 25 m/min max. surface pressure 250N/mm²
ball cage no clearance preloaded low heat increase good wear resistance less maintenance to avoid forces comming from the side
FIBRO High Precision Roller Guides higher load carrying capacities larger contact area demands significantly smaller preloading values
Guiding Systems Sintered Guide Bushes with carbonitrieded surface. A porous material with 18-20% of pours, highes security against dry running and seizing. Ball Bearing Busings, Brass Ball Cages, highest quantity of balls compared with all competitors. Roller Cages, highest quantity of rollers compared with all competitors. Steel Bushes, running surface Bronce coated. Bronce Bushings with embedded solid lubricant.
Pairing Classification The guide pillars, the sintered sliding guides and the guide bushings for ball and roller cages are within the allowed production tolerance signed with colour. This allows to choose respecitve to the demand a smaller or wider tolerance . Sintered guide bush Pillar/shaft Ball bearing bush
Lifetime of ball bearing guides high quantity of balls high quality of surface of pillar and bush surface roughness 1µm or smaller hardened pillars to HRC 62+-2 or higher hardened bushes as above roundness very important
Cycletime before regrinding what is usual what is normal HSS Dies 100.000 - 500.000 strokes Carbide Dies 1,5 million - 3 million strokes at some customers were 10 million strokes reported 30 million with a Kramski tool at one customer 8 million strokes after 40 million, ball cages were replaced after 270 million, all guides were replaced
2020.62.025.090.120.10 2061.44.025.047.10 2061.44.025.037.10 206.71.025.045 206.71.025.056 total for 4 sets 864,-- ball cages replaced 1248,-- total 2112,--€ 270 Millions 0,00000782
Deutschland England Schweden Frankreich Norwegen Taiwan USA Brasilien Mexico China Tschechien References Hydraulic Cams
Referenzliste Standard Parts
Total appr. 12.000 customers References Standard Parts
26.02.04 W. Löhsl Thank you!

More Related Content

Lebensdauer Normalien2003 Gb

  • 2. reducing downtimes reducing maintainance getting longer toolife longer cycletimes between resharpening in total: getting cost‘s down
  • 3. Searching the problems and first action is: using better material for punches using better material for dies coating punches and dies What will be done for this
  • 4. why is it done like this everyone can see here is something to do but is this all no there are more important factors as the press itself the guiding systems
  • 5. the press itself gives unequal sideforces to the tool Forces comming from the press ram are high and unequal, who knows the datas from the parallissm of the press ram to the press table? Theses things are not taken under consideration because most times unknown!
  • 6. Press forces occure reduction of tool life Who knows the existing situation of the press guides? Maintainance or responsible people say they know but if you ask for real datas they can not be found. And even if they have they can not do anything against it.
  • 7. but the main and most important factor is the guide element
  • 8. All forces are going to the guidelement no matter they are occured from the press or from the cutting or bending forces from the tool the guide element is responsible to hold the position between punch and die during cutting or bending process
  • 9. Superfinished Guide Pillars High Precision Ball Bearing Guides High Precision Roller Guides Precision Sintered Ferrite Guides
  • 10. FIBRO Sintered Ferrite Guides high stiffness good emergency running properties high precision guide tolerances consits 20% of pores, vacum filled with oil able to keep side forces max. velocity 25 m/min max. surface pressure 250N/mm²
  • 11. ball cage no clearance preloaded low heat increase good wear resistance less maintenance to avoid forces comming from the side
  • 12. FIBRO High Precision Roller Guides higher load carrying capacities larger contact area demands significantly smaller preloading values
  • 13. Guiding Systems Sintered Guide Bushes with carbonitrieded surface. A porous material with 18-20% of pours, highes security against dry running and seizing. Ball Bearing Busings, Brass Ball Cages, highest quantity of balls compared with all competitors. Roller Cages, highest quantity of rollers compared with all competitors. Steel Bushes, running surface Bronce coated. Bronce Bushings with embedded solid lubricant.
  • 14. Pairing Classification The guide pillars, the sintered sliding guides and the guide bushings for ball and roller cages are within the allowed production tolerance signed with colour. This allows to choose respecitve to the demand a smaller or wider tolerance . Sintered guide bush Pillar/shaft Ball bearing bush
  • 15. Lifetime of ball bearing guides high quantity of balls high quality of surface of pillar and bush surface roughness 1µm or smaller hardened pillars to HRC 62+-2 or higher hardened bushes as above roundness very important
  • 16. Cycletime before regrinding what is usual what is normal HSS Dies 100.000 - 500.000 strokes Carbide Dies 1,5 million - 3 million strokes at some customers were 10 million strokes reported 30 million with a Kramski tool at one customer 8 million strokes after 40 million, ball cages were replaced after 270 million, all guides were replaced
  • 17. 2020.62.025.090.120.10 2061.44.025.047.10 2061.44.025.037.10 206.71.025.045 206.71.025.056 total for 4 sets 864,-- ball cages replaced 1248,-- total 2112,--€ 270 Millions 0,00000782
  • 18. Deutschland England Schweden Frankreich Norwegen Taiwan USA Brasilien Mexico China Tschechien References Hydraulic Cams
  • 20. Total appr. 12.000 customers References Standard Parts
  • 21. 26.02.04 W. Löhsl Thank you!

Editor's Notes

  1. Wälzführung slideway Bei der Wälzführung werden die Querkräfte durch Wälzkörper von der Führungsbuchse auf die Säule übertragen the radial load is in the slideway transfered over the balls from the guiding bush to the pillar
  2. Wälzführung slideway Bei der Wälzführung werden die Querkräfte durch Wälzkörper von der Führungsbuchse auf die Säule übertragen the radial load is in the slideway transfered over the balls from the guiding bush to the pillar
  3. guidance Führung dimensions from guide elements Abmessung Führungselem. ball cage or sinter guide bushes Kugel oder Sinterführung clearance from pillar and guide bush Führungsspiel der Führung Wie schon ganz am Anfang gezeigt ist die Werkzeugkonstruktion, eine zentrale Koordinationsstelle As I show at the beginning is the construktion / design a central coordination point Der konstrukteur muß folgende Punkte bewerten und bestimmen Abmessung der Führungselemente und Auswahl Gleit, oder Wälzführung und Führungsspiel der Gleitführungen the designer must assess and fix follwing points. dimensions from guide elements, ball cage or sinter guide bushes and he choose the right clearance
  4. hohe steifigkeit gute Notlauf Eigenschaften hohe präzise Führungstoleranzen20 Volumenprozent des Lagerkörpers sind Poren, die mit Öl gefüllt sind
  5. fast spielfreie Führung nearly absence of bearimg play Hubfrequenzen <400/min -1 number of stroke cycles leichtgängig easy movement wenig Kraftaufwand less expenditure of force wenig Erwärmung less heating gute Verschleißfestigkeit good capacity of resistance to wear geringe Wartung less maintance Vorteil Kugelführung: Kippen des Stößels, wird durch die Vorspannung bei Kugelführungen gegenüber Gleitführungen besser verhindert The preload from the ball cages have a big advatage in contrast to the guide bushes. The ram couldn´t be tilt Der Stanzstoß beim Auftreffen der Schneidstemepl auf den Blechwerkstoff verhindert kurzzeitig das Rollen der Kugeln, gleichzeitig bewirken die auf die Kugelkäfig übertragenen Massenkräfte ein mehr oder weniger starkes rutschen der Kugeln auf dem Führungsyilinder. the punch concussion during the impact from punch and metal sheet prevent for a short time, that the balls are rolling, simultan is the effect from the mass of accelaration on the ball cage. The result is, that the balls are sliding over the pillar surface
  6. . hohe Tragzahlen hohe Oberflächengüte der Führungselemente Rauhtiefe der Führungssäule 1µm gehärtete Führungssäulen gehärtete Führungsbuchsen