Raw
Material
All ferrous and non-ferrous materials associated with the
manufacturing of all Electro-magnetic applications are maintained in our
inventory.
Types:
- Nickel Alloy - 50% and 80% alloys.
- Silicon Electrical Steels - grain and non-oriented, fully
and semi-processed
- Cobalt Alloy
- Non-ferrous materials
- Stainless Steel
- Cold Rolled Steel
- Thickness .004" - .080"
- Tempers Rockwell B90 stamping grade to full soft
temper.
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Material Coating
The normal surface
oxide on both silicon and nickel flat rolled steels provide some degree of
inter-laminar resistance that may be adequate for many applications.
However, as additional inter-laminar resistance is generally desired, EMP
laminations are coated, as appropriate for the material
types:
- Silicon Steel - inert positive coating applied by the mills.
Additional or alternate coatings may be applied to thin gauge
steel.
Nickel Alloy - a proprietary solution containing magnesium is
applied for maximum insulation through annealing with minimum interference
in work performance (coating thickness .0004"
overall).
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Slitting
EMP maintains inventories of standard materials in wide
coil, as orders are received, material is slit to the appropriate width
for the die which produces the part. This minimizes customer
lead-time.
The quality of slitting directly affects the finished part, and
in some cases a slit edge is on the finished part. Unlike EMP, most steel
service centers are not qualified to slit electrical steels.
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Stamping
EMP offers 20 high-speed
production presses ranging from 2 ton to 100 tons in sizes handling die
lengths to 44". Press speeds to 600spm.
SCR controls available for the more complex "state of the
art" staking and indexing operations.
Adjustable cutoff tooling for the manufacture of shunt and
strip (bar) laminations, and to modify standard product sizes.
All press stations are equipped with instrumentation to
check tolerances, flatness and shear/break. The press operator maintains
statistical production controls with authority to stop production for
tool adjustments or sharpening.
All operators are qualified to set-up tooling. Precise
set-up procedures are available along with the tool performance
history.
Tooling is moved to die-service as needed and at completion
of every run, where it is prepared for the next run cycle.
The operator is familiar with the customer that the parts are
being produced for and any specific quality
requirements.
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Annealing
EMP offers several furnace styles as well as gas fired and
electric heated. Furnace styles include:
- Batch - 3 volume sizes to custom anneal varying load
sizes
- Furnaces are controlled by state of the art SCR controls
with temperature control to ± 10° F and flexibility to adjust cycle
times to meet specific requirements of the customer and the
material.
- Computer controls are employed to follow exacting time and
temperature requirements over hours or days. The appropriate cycle is
precisely reportable.
- Chart recorders provide a record of every "heat". These are
traceable to the incoming raw material and the steel manufacturers
original melt.
Temperature ranges up to 2200° F.
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Shipping
Shipping is organized to integrate with customer receiving
programs such as "Just in Time", Kanban, etc. The department is informed
of the specific requirements for each customer in order to meet the
packaging and delivery requirements of each
customer.
Shipping and packaging are as integral a part in the total
picture as any of the other processing phases at EMP. Optimum packaging
and mode of transportation is carefully considered to minimize freight
charges without sacrifice to quality or packaging.
E & I type laminations are packed together as stamped, to
insure equal thickness and quantities. A sheet of rust inhibiting paper
(VPI paper) is routinely placed atop silicon laminations.
Shipping weights are carefully calculated on accurately
calibrated weighing equipment to assure the accuracy of your
shipments.
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Quality
Control
EMP complies with
all rigid MIL specifications; i.e. MIL 45208A, MIL Q-9858A, MIL STD-45662
among them, and per ASTM-346-64 testing procedure. Nickel laminations are
tested every lot to AQL MIL Spec 105-D - 1.5 level by 100% interleave at
60 Hertz regarding mechanical and electrical quality and consistency
through every work station.
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Value
Added Services
EMP has
supplied quality transformer and motor laminations to the aerospace,
industrial control, electric motor and telecommunications industries for
over 30 years.
In addition to our quality stampings EMP has extensive
fabrication and secondary operation capabilities:
- Complete Stack Assemblies-Bonded, Riveted, Welded and
Taped
- Shields and Bar Pieces
- Precision Production Grinding
- Hydrogen and Neutral Atmosphere Annealing
- Material Slit Widths to Customer Specifications
49% & 80% Nickel Alloy
Cobalt (Hiperco 50)
- Grain Oriented/Non-Oriented Silicon Steels
- In-House Die Maintenance and Service
Optimum Die Life and Efficiency
New Tooling Design and Fabrication
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