Posts

Power Through Pressmaster Hydraulic Press

When the pressing application requires a force of 10 tons or more, manufacturers can count on hydraulic, hydropneumatics and pneumohydraulic presses. Some assembly technologies evolve too fast or too slow, while others change at a pace that’s just right. Hydraulic presses belong in the latter category, according to some suppliers, and that’s a good thing. The biggest area of growth for pressmasterhydraulic press technology lies in the controls system. Automotive, aerospace and medical manufacturers want and need advancements in operator control, press-data acquisition, process monitoring, quality control and maintenance scheduling. These benefits nicely complement the hydraulic press’s ability to generate high force over a small area and equally throughout the stroke. All of these capabilities are important to companies with hydraulic pressing applications, especially those that require 10 tons or more of force. Pure Power Pressmasterhydraulic press have been used on assembly...
Post a Comment
Read more

Understanding Torque and Tension Relationship

Fastener assemblies are simple machines but they are often used in very complex structures.  When working in situations where joint failure is catastrophic making assumptions about how well they are working is not an acceptable method of operation.  In these cases liability and refastening costs are so high that it is essential to understand the hows and whys of fastening with bolts and nuts to answer torque and tension relationship . It is recognized we measure torque when tightening threaded fasteners only because measuring bolt tension, the more important quantity, is much more difficult. The torque and tension relationship created from the resulting bolt elongation is most commonly described by T = F*K*D where T is torque, K is the nut or friction factor (nut factor for this article), D is the bolt diameter and F is the bolt tension or preload. Less common is a discussion of how this equation was derived, in particular the origin of the nut factor. Because...
Post a Comment
Read more

In-depth Use of Ultrasonic Bolt Tension Meter

The fundamentals of using ultrasonic bolt tension meter for bolt strain measurement, detecting change in the time required for a pulse of energy to travel the length of the fastener after elongation, can be performed with very good resolution and repeatability. The challenge is utilizing this core capability in a manner such that the resulting calculation of boll tension is also accurate and repeatable. Traditionally, the primary barriers to this have been in three areas maintaining a stable bolt-sensor interface where the pulse passes into and out of the fastener, accounting for the influence of temperature on the measurement and providing an accurate means of converting a given change in the pulse’s time-of-flight (TOF) to usable units of tension or load. The last is generally refined to as calibration. Recent developments that affix the sensor to the fastener, leaving the bolt-sensor interface a fixed and permanent condition, have largely solved the interface instability prob...
Post a Comment
Read more

Highest ROI through Pressmaster Hydraulic Press

The hydraulic press is the workhorse in a modern machine shop. Whether H frame press or C frame press, it is a major investment. When looking for a new one, your goal is to get one that is appropriate for the jobs you routinely work on. You also want a press that is cost-effective, durable and reliable. Here are some tips to keep in mind as you research the best pressmaster hydraulic press for your shop. Know the needs of your shop Before you start looking at hydraulic presses, write out a master list of jobs that you routinely do. This will tell you what processes you need your hydraulic press to perform. Whether it is blanking, punching, stamping, bending, drawing, metal forming or molding, be clear about the principle uses you will make of your new press. Choose flexibility Modern pressmaster hydraulic press come in a range of tonnage and with a variety of features. Many make it easy to control pressure and ram speed. These presses are highly customizable and can e...
Post a Comment
Read more

Advancements in COF Tester Technology

Coefficient of Friction, commonly referred to as COF, is a ratio of the force required to move one surface over another to the total force applied normal to those surfaces. In more common words – COF measures how slick or slippery a surface is. In this post we will talk about COF within the context of aluminum foil based packaging. COF is broken down into two readings in COF tester , Static and Kinetic. Static COF is the ratio of force required to move one surface over another from the instant motion starts while Kinetic COF is that same ratio once the surface is already in motion. To once again break it down in more common terms, Static COF is the force required to get moving while Kinetic is the force required to keep moving. Why COF Matters in Packaging COF can be vital to the performance of a wrap on a packaging line, particularly on high speed packaging lines. Any time a wrap or wrapped item is pushed, pulled, dragged, or grabbed throughout the wrapping process its COF...
Post a Comment
Read more

Ultrasonic Torque Measurement Fastener

Although measurement of the torque applied to a bolt or other threaded fastener during tightening provides sufficient feedback in most applications, there are more specialized tasks where measurement of the fastener tension is essential to ensure the integrity of the mechanical joint. To address this requirement, ultrasonictorque measurement has introduced the USM-3 ultrasonic bolt meter – a compact, lightweight, field-portable unit that gives precise measurement of elongation and load in threaded fasteners. Ultrasonic TorqueMeasurement Traditionally, ultrasonic measurement has been a highly skilled task, requiring extensive knowledge of material properties to determine the correct transducer diameter, the correct transducer frequency, and to interpret the results. The USM-3 overcomes all of these challenges and gives the operator a highly accurate yet easy-to-use tool for determining the tension in a fastener. Real-time, precise bolt measurement can be accomplished in fastene...
Post a Comment
Read more

Bolted Joint Calculation Example and Conditions

Properly designed boltedjoint calculation example is extremely important for striking the balance between the cost and life of the joint. As a design engineer, for a good bolted joint design, for a given loading conditions and materials of the abutments, you have to basically select the following design parameters: diameter or size of the bolt or screw, strength of the bolt or screw, preload or tightening torques, selection of the washers. Bolted machine design Bolted joints are one of the most common elements in construction and machine design. They consist of fasteners that capture and join other parts and are secured with the mating of screw threads. There are two main types of bolted joint designs: tension joints and shear joints. In the tension joint, the bolted joint calculation example and clamped components of the joint are designed to transfer an applied tension load through the joint by way of the clamped components by the design of a proper balance of joint and...
Post a Comment
Read more