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Selection of Tool Steel - Tablet Compression Tooling
By- Chandrakant [email protected]
Compression Cycle On Rotary Tablet Press Compression Cycle On Rotary Tablet Press
Punches & DiesPunches & Dies
Punches and dies are essential tools in the tableting process and therefore are critical to the quality of the tablets produced.
Tool Steels
Tool steel is the product of a highly
specialized branch of the steel
industry.
To be acceptable to the
pharmaceutical industry the steel
should be free from impurities and
undesirable elements.
Selection of right steel is the key to
the successful performance of
Tablet compression tooling.
Properties of Tool Steels
Material Test Certificate for Tool Steels
Type of Tool steel
Tool Steels
Steels used to manufacture tablet press tooling have been grouped into three
categories:
Chemical Composition of Tool Steels
Chemical element
AISIS1
AISIS5
AISIS7
AISI408
AISIA2
AISID2
AISID3
AISI440C
AISIO1
Carbon 0.40-0.55
0.50-0.65 0.45-0.55 0.40-0.55 0.95-1.05 1.40-1.60 2.00-2.35 0.95-1.20 0.85-1.00
Manganese 0.10-0.40
0.60-1.00 0.20-0.80 0.40-0.60 0.00-1.00 0.00-0.60 0.00-0.60 0.00-1.00 1.00-1.40
Silicon 0.15-1.20
1.75-2.25 0.20-1.00 0.25 max 0.00-0.50 0.00-0.60 0.00-0.60 0.0-1.00 0.10-0.50
Chromium 1.00-1.80
0.00-0.35 3.00-3.50 0.60-0.80 4.75-5.50 11.00-13.00
11.0-13.5 16.0-18.0 0.40-0.60
Vanadium 0.15-0.30
0.00-0.35 0.00-0.35 -- 0.15-0.50 0.00-1.10 0.00-1.00 -- 0.30 max
Tungsten 1.50-3.00
-- -- -- -- -- 0.00-1.00 -- 0.40-0.60
Molybdenum
0.00-0.50
0.20-1.35 1.30-1.80 -- 0.90-1.40 0.70-1.20 -- 0.00-0.75 --
Nickel -- -- -- 3.00 -- -- -- 0.00-0.50 --
Cobalt -- -- -- -- -- 0.00-1.00 -- -- --
Percentage of chemical elements.
Hardness of tool steels
Hardness of punches expressed in HRC
Hardness of tool steels
For more information on fundamentals of
Rockwell hardness testing log on
www.instron.com & www.wilsoninstruments.com
• Wear resistance of steel usually
increases as its hardness increases on the other hand toughness and ductility decreases.
• Hardness of tool steel is checked by with a nondestructive tester Rockwell tester.
• Rockwell tester has two scales A and C for measuring tool hardness.
Hardness of tool steels
Typical Hardness Reading for Tool Steels
Hardness Ranges (HRC-Rockwell C scale)
Type of tool steel
AISIS1
AISIS5
AISIS7
AISI408
AISIA2
AISID2
AISID3
AISI440C
AISIO1
Punch 54-56 50-59 54-58 48-56 58-60 58-60 58-60 56-58 55-60
Die -- -- -- -- 60-62 -- 62-64 56-58 --
High hardness value
indicates, more
resistance to wear
Selection of tool steel
While procuring new punch setWhile procuring new punch set
Collect the information about the nature of product like abrasive, corrosive etc.Collect the information about the nature of product like abrasive, corrosive etc.
Collect the information on tooling related problems if the particular product is manufactured at other locations within the company.
Collect the information on tooling related problems if the particular product is manufactured at other locations within the company.
Discuss product properties & tooling related issues with Tooling manufacturer.Discuss product properties & tooling related issues with Tooling manufacturer.
Select the correct tool steel.Select the correct tool steel.
Selection of correct quality of steel
Cost factor for Tool steel
Thank You
Questions please !