MoldMaking Technology

JAN 2018

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Surface Treatment 30 MoldMaking Technology —— JANUARY 2018 and magnetic field), which causes the striker tool to recipro- cate rapidly when placed against the workpiece surface. This produces the hammering action. The metal strikers have spherical tips and range in size from 1–25 millimeters in diameter. These interchangeable strikers are the actual tools that hammer on the surface. Both the impact force and the hit rate (or the frequency) are variable, gen- erating up to 180 kilograms of force per strike and 500 hits per second. A flanged adapter fastens the head to the CNC machine, and that is where the head's position is manipulated by programmed axis movements against the workpiece surface. The CNC machine controls the feed direc- tion of the head on the surface. The direction is usually per- pendicular to the previously milled toolpath. This peening process creates smoothness on the surface by flattening the material peaks into valleys. The material flow that radiates beneath the surface achieves a perfectly smooth outer surface that is uniformly polished, avoiding any need for hand finishing. Technically speaking, peening can reduce the cusp height as much as 0.075 micrometer. That is, 0.000075 millimeter or 0.000003 inch, which is equivalent to anything that can be produced by hand. At the same time, this process enhances the surface by mechanically increasing the hardness and imparting resid- ual compressive stress into the outer layer, which produces a more durable surface that is less prone to fatigue, wear or micro-cracking. Additionally, since the hammer produces considerable strike force, the final milling pitch and the corresponding cusp height before peening could be much coarser than if hand polishing were to follow. Typically, finishing pitch dis- tance can be doubled or tripled, reducing finish milling time by 50-60 percent. Machine-Hammer Peening Benefits For most jobs, an automated polishing solution is ideal. Moldmakers save a great deal of time and money, they rely An electronically-controlled hammer head produces machine- hammer peening, and a CNC machine or a robot controls the head positioning, executing CAM software that is programmed specifically for peening applications. WEBINAR UPCOMING ENGINEER / BUILD / MAINTAIN PRESENTER: Justin Ferguson Technical Specialist DATE & TIME: Thursday, January 25, 2018, 2 pm ET Register at short.moldmakingtechnology.com/adsk0118 Mold & Die : The Key to Optimal Machining Productivity PRESENTED BY: autodesk.com/MAKE In spite of emerging technologies like 3D printing, the workhorse of many mold and die shops is still traditional subtractive manufacturing, or CNC machining. In this webinar, Autodesk will present the latest CAM solution Autodesk PowerMill ® 2018 to demonstrate how manufacturers can machine the most complex cavities, cores, sliders and associated parts with exceptional levels of precision and quality that require no manual polishing or re-work. Primary topics will include: • Utilizing stock models to quickly remove remaining material. • Changing 3 to 3+2 with Dynamic Machine Control to adjust the tool axis to an optimum collision-free toolpath. • Feeding a machine the right amount of points with the ability to set point spacing before or after the toolpath is calculated.

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