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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.
Guest Blogger Kelly Barner, Editor, Buyers Meeting Point Think globally, act locally. – Paul McCartney …except when to do so causes more harm than good. – Kelly Barner As consumers of goods and services, we are constantly bombarded with feel good messages about the companies we buy from. Green production, sustainability, and local sourcing: it is easy to take for granted that these programs are in everyone’s best interests. After all, why wouldn’t we want the companies we patronize to keep the bigger picture in mind and take every opportunity to do a little bit of good in the process of making a profit? Business to business operations have to take a different kind of approach to such initiatives as their immediate customers are usually more motivated by efficiency and innovation than socially-oriented programs. Procurement and purchasing professionals play a unique role in B2B local sourcing; we have to outline the pros and cons and help the rest of the company dec
President Trump announced via tweet on Monday that he was imposing tariffs on steel and aluminum imports from Brazil and Argentina due to both governments devaluating their currencies. These two countries previously had reached a deal with the Trump administration to avoid Section 232 steel and aluminum tariffs by agreeing to quotas. Both Argentina and Brazil were exempted from the 232 steel and aluminum tariffs in May 2018. The tariffs can’t be “restored” because the two countries were not subject to tariffs in the first place. The exemptions for both countries required Presidential Proclamations, and to change the quotas to tariffs would require new proclamations as tariffs can’t be re-imposed by a tweet. At this writing, we are still awaiting these proclamations. If the President does move forward with these tariffs, it would likely lead to an immediate legal challenge. A current U.S. Court of International Trade case (Transpacific Steel v U.S.) is focused on this exact issue of
On September 24, the Department of Labor (DOL) announced its final overtime exemption rule issued under the Fair Labor Standards Act, increasing the minimum salary threshold for workers to qualify for overtime pay when working more than 40 hours per week. By increasing the threshold for employers subject to the federal standard to $35,568, up from the current threshold of $23,660 set in 2004, the agency claims 1.3 million more American workers will be eligible for overtime pay. The DOL’s final rule, which goes into effect on January 1, 2020, includes: Increasing the minimum salary required for an employee to qualify for exemption from the currently enforced level of $455 to $684 per week ($35,568 annually); Increasing the total annual compensation requirement for “highly compensated employees” (HCE) from the currently enforced level of $100,000 to $107,432 per year; Allowing employers to use nondiscretionary bonuses and incentive payments (including commissions) that are paid