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THE MATERIAL
=IHCP® is an induction hardened and chrome plated, medium carbon steel. The
induction hardened layer is a minimum of .050" deep with a minimum hardness of
HRc 50. The chrome plate is a minimum of .0005" thick with a hardness of
approximately HRc 70. The medium carbon steel base is approximately .45% carbon
with a hardness of approximately HRc 18/30.
The machining of IHCP® will
include cutting of all of the above conditions. The most critical operation
will be the removal of the chrome plate and the induction hardened layer which
will necessitate the use of somewhat unique tooling.
THE SETUP =Maximum rigidity is a
must. Tool overhang must be kept to a minimum and the machine must be I good
tight condition. Since the chrome is of such high hardness, the cutting insert
must be oriented to a 45°side cutting edge angle (S.C.E.A.) to minimize the
notch effect.
- The area to be machined should be as close as
possible to the chuck.
- The use of a steadyrest is not recommended unless a
live center in the tailstock is also incorporated in the setup.
- The speed: 280/320 surface feet per minute
(SFM)
The feed: .003-.005" per revolution.
The depth of cut: 1/8"
Coolant: none
Horsepower: approximately 7
THE TOOLING
The first turn
operation is performed on material that is very hard. Consequently a very hard
and abrasion resistant cutting tool must be used.
Hot pressed ceramics fill this need.
The style and size of this insert is described at the left.
THE RESULT
During the cutting an
intense amount of heat will be generated. This is normal. The chips will be
dark red in color and some sparking may occur. At no time should coolant be
applied as thermal shock will definitely destroy the ceramic insert.
Do not allow the insert to dwell or
rub as work hardening will occur.
   
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Standard Plate
Thickness: |
.0005" Minimum [.0127 mm]
Hard Chrome Plated per side unless otherwise specified.
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Hardness of Chrome
Plate: |
HRc 69-71 |
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Surface
Finish: |
16 Ra Maximum |
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Length:
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Any specified length 12'
to 24' [3657.6 mm to 7315.20 mm]. Others on application. Cutting to specified
rod lengths is readily available. |
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Length
Tolerance: |
+ .060"
- .000
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Squareness of
Cut: |
.015" [0.381 mm] per inch
of Diameter |
| Packaging: |
Collared and Boxed or
Individually Fiber Tubed. Bar coding on all tags. |
| Identification: |
Ends can be color coded
to customer requirements. |
| IHCP®
Surface Hardness: |
HRc 50 Minimum (Other
specifications on inquiry.) |
| IHCP® Case
Depth: |
.050" Minimum [1.27 mm]
effective case depth unless otherwise specified. (On full length bars, maximum
of 1 ½" [38.10 mm] from either end is neither hardened nor plated.)
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| IHCP®
Effective Case Depth: |
Effective case depth is
the perpendicular distance from the surface of a hardened case to the furthest
point where a specified level of hardness is maintained. The hardness criterion
is 50 HRc, except where otherwise specified. Effective case depth should always
be determined on the part itself, or on samples or specimens having a heat
treated condition representative of the part under consideration. (SAE
Recommended Practice - METHODS OF MEASURING CASE DEPTH - SAE J 423 a) |
| IHCP®
Selective Hardening (Cut Blanks): |
12" [304.80 mm] Minimum
Hardened Length. ¾" [19.05 mm] Minimum Unhardened Length. ±
¼" [6.35 mm] Tolerance for Induction Hardened Transition Zone. |
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| 1045/1050
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50,000 psi
Approximate yield |
5/8" to 6"
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| 1045/1050 |
75,000 psi Minimum yield
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5/8" to 5" |
| 1045/1050 |
100,000 psi Minimum
yield |
5/8" to 4 ½"
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| Alloys and higher strength steels are available.
Metric sizes are readily available |
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| 5/8” to less than
2-1/2“ |
.0015” |
| 2-1/2” to 3“
inclusive |
.002” |
| Over 3“ to 4” inclusive |
.003” |
| Over 4” |
.005” |
Tolerances, in decimals of an inch, provide for
undersize variation only:
ISO Tolerances are available |
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