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Stress Levels Are Increasing In The Press Shop
Pete Ulintz PMA Technical Director
high-tensile-strength materials can affect the size, strength, power and
overall configuration of every major piece of press-line equipment, including, presses,
feed systems and coil-straightening systems.
blanking and punching stresses produce unloading forces in stamping presses
called “snap-through” or “reverse-tonnage” loads. Because high-strength
materials require greater stress to blank and cut as compared to mild steel,
they generate proportionally greater snap-through loads. These forces can
easily exceed the limits for which the machine was originally designed,
resulting in premature wear, damage and sometimes catastrophic failures.
Energy is expended with each stroke of the press and
this energy must be replaced. Critical attention must focus on the size of the
main drive motor (horsepower), flywheel mass and the rotational speed of the
flywheel when stamping higher-strength materials. The main motor, with its
electrical connection, is the only source of energy for the press and it must
have sufficient horsepower to supply the demands of the stamping operation.
stamping presses are not the only equipment affected by higher-strength
materials have a greater tendency to retain their coil set, which makes straightening
them to an acceptable level of flatness very challenging. Straightening in a
traditional five- or seven- roll flattener may require larger-diameter straightening
rolls and wider roll spacing in order to work the stronger material more
effectively. But increasing roll diameter and center distances will limit the
range of other materials that can be straightened. Additionally, roll defection
- due to material strength and the deeper roll penetration required - can
present significant problems. Close-center precision straighteners, having nine
to 21 straightening rolls that are backed up with support rolls, often are required
systems may require additional servo-motor power and/or torque capability to
pull the stronger material through the straightener. Additional back tension
between the feeder and straightener also is required as the higher yield
strength material in the loop tends to push back against the straightener or
the feed system.
assume that stamping higher-strength materials will be a “business as usual”
condition for an existing press line – that can be a very costly mistake. These
materials can easily push press line performance requirements well beyond the
capabilities and limitations for which they were originally designed.
President Trump yesterday signed a proclamation placing tariffs of 25 percent on steel imports and 10 percent on aluminum imports. Mexico and Canada are exempted from the tariffs for now. The tariffs take effect at 12:01 a.m. on March 23. The President’s action is the result of recommendations from two Section 232 (national security) investigations conducted by the U.S. Commerce Department.
According to the proclamation, within 10 days, the Commerce Department will announce the process for filing a request for an exclusion for steel and aluminum products not available in the U.S.
These tariffs will place at risk the jobs of millions of Americans who are employed in the metalforming, metal stamping and other U.S. industries that use steel. Restricted availability and increased costs for raw materials will likely lead to current customers sourcing finished products from overseas competitors, who will produce them with foreign steel or aluminum and import them tariff-free.
Blogger: Kathy Kiernan Senior
Vice President & Managing Partner, APPI Energy Retail electricity prices are largely driven
by natural gas prices. Even though your
system operator (PJM, ERCOT, MISO, NEPOOL) is procuring power from a variety of
sources—hydroelectric, wind, solar, nuclear, coal, gas—the way system operators
pay generating plants is based on the last fuel used to meet demand, which is
almost always natural gas. Therefore, the amount you pay per kWh is determined
primarily by the current price of natural gas in your region. Retail electricity prices tend to follow
trends in natural gas prices. Gas prices, however, are significantly more
volatile than electricity prices. For example, when we see gas prices
fluctuate by as much as 70% in a single month, corresponding electricity prices
will generally move in the same direction, but by only around 10%. The change
in electricity prices will also typically lag behind gas prices by a couple of
the financial secto…
Guest Blog: Laurie Harbour President and CEO, Harbour Results, Inc.
In 2016 the U.S. manufacturing industry was relatively stable with overall production slightly up from previous years. Specifically, the automotive tool and die industry was predicted to be busy with forecasted tooling spend on the rise. However, taking a closer look, the year proved to be a bit more challenging. Data collected through the Harbour Results’ Harbour IQ pulse survey (a business intelligence tool for performance, financial, operational, trend and market data), which was completed by more than 100 tool shops globally in the second quarter of 2016, has shown that capacity reached a low of 81 percent among die shops in late 2015 and early 2016, but was expected to rebound to 78 and 86 percent respectively by year end.
So what caused the slow down? Program delays—on average, just over 20 percent of vehicle launches were delayed in 2015 and 2016. Work on hold—in early 2016, 18 percent of all work that had been …