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This short video provides some insight into the benefits and time savings afforded by a universal grinding machine. It is presented as supplemental information to Cutting Tool Engineerings December 2011 cover story, A Pitch for Thread Grinding.Video courtesy of United Grinding.
Regarding lead tolerances achieved by different threadmaking methods, Hans Ueltschi, vice president for the cylindrical division of United Grinding Technologies Inc., Miamisburg, Ohio, said, In thread grinding, we typically talk about tolerances in the lower tenths and millionths, whereas turning thread tolerances are more in the upper tenths and thousandths. Grinding machines are typically able to achieve tolerances of about 0.0002 or tighter.
Consistency is another advantage of thread grinding. You can dress the grinding wheel extremely precisely, and, once you have that form in the wheel, the wheel generally doesnt wear as rapidly as does a single-point tool, Ueltschi said.
Thread grinding can also enhance production flexibility. In a job shop environment, a wheel can be redressed quickly to produce a different thread, while other methods may require different cutting tools.
Jim Vosmik, president of Drake Manufacturing Services Co. Inc., Warren, Ohio, cited production of positioning worms for automotive electronic power steering systems as a typical thread grinding application. A low-quality, threaded worm can produce unwanted noise in the passenger compartment. Key considerations are surface finish, waviness and accuracy of the thread leadnot in overall length, but in each revolution, he said.
Inaccuracyknown as drunkenness or wobbleproduces variations in torque, and the feel of the steering will change. For automotive steering components, customers are looking for a surface finish finer than 0.2m Ra, form compliance on the thread track around 5m and lead variation in one revolution below 3m, Vosmik said. These tolerances are more typical of the highest-quality positioning ballscrews and indexing worms.
Machines engineered to grind threads can be grouped into two broad categories universal cylindrical grinders with thread grinding capability and dedicated thread grinders. The machine styles differ in the way they apply the wheel, how the wheel interacts with the part and the number of setups required to produce a part.
In a universal grinding machine fitted for thread grinding, the grinding wheel typically is not tilted to produce the threads helix angle. We call it axis parallel thread grinding, Ueltschi said. The wheel spindle axis is parallel to the workpiece axis. The thread form dressing is adjusted to compensate for not tilting the wheel we actually dress it wrong so it comes out right. If we dressed the wheel with the normal thread form and then cut the thread with the wheel parallel, the thread would have an error. The machines grinding software controls dressing.
Double-disc grinding with machines from Thielenhaus and Thielenhaus-NISSEIFlat and stamped parts are machined on the double-disc grinding machine using a through-feed, plunge-cut or oscillation process, depending on the respective requirements.The scope of application for the V vertical series is extremely versatile.
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EDITORSNOTERalf Schrl, whoisarea sales manager for SchaudtMikrosa, of United Grinding, and technical sales support for United Grinding North America Inc.,co-authored this report.
Centerless grinding is critical to manufacturing many high-volume automotive components. These include valve spools, control rods, camshafts, crankshafts, pistons, sleeves and rollers. In addition, centerless grinding is applied to produce parts for the hydraulics and fluid control, medical and aerospace industriesindeed, any industry where roundness and extreme accuracy of cylindrical surfaces is needed.
For those making chips every day, centerless grinding may seem mysterious, but its a fairly straightforward process. Thisarticle will discuss how it works, where and when it should be used, and offer advice on how to apply this well-established technology.
Before the development of centerless grinding, round parts were either ground between centers or by gripping them with a chuck or fixture. Centerless grinding requires no such workholding methods. Parts are fed between a grinding wheel and a smaller regulating wheel while resting on an angled workpiece supporta blade-like device that sits between the opposing wheels.
Schematic of a horizontal centerless grinding setup. Illustration by CTE staff.
Less grind stock for finishing is generally needed on centerless parts, as the workpiece tends to find its own center upon initial contact with the wheels. Unfortunately, this means concentricity with previouslymachined holes and other features can be a problem, which is one of the main disadvantages of centerless grinding. Increased setup time is another, because of the need to handle and dial-in large wheels, and special work supports might berequired.
Centerless grinding machines are often classified according to the inclination of the machine bed. Horizontal-bed machines are the most common, as they provide easy accessibility during wheel dressing. Angular and even vertically inclined beds are used for grinding heavy workpieces because of the potential for a greater grinding force and less abrading of the workpiece by the work support.
Close-up view of a work-rest dead stop, setup for infeed grinding.All images, except where noted, courtesy Mikrosa.
Some builders classify their machines by the type of grinding zone. With moving-zone, or three-slide, machines, the grinding wheel is fixed during operation and the X-, Z- and B-axis wheel inclination movement is controlled from the regulating side. This arrangement provides a compact design and excellent rigidity. Unfortunately, more-frequent adjustment of the work-rest support is required when the grinding wheel wears, although this is easily compensated for because it sits on a separate CNC slide.
Stationary-zone centerless grinders incorporate a stationary or minimally adjustable work-rest support, and the grinding and regulating wheels each ride on their own X- and Z-axis slides.
Apr 13, 2012nbsp018332TR120 Z2L2X is a new side grinding machine which besides finishing the edges of plates and bars cut on laser or shear also bevels upper and lower edges. ... Check the demonstration video below with demonstration of steel plates side grinding and also of stainless steel plate grinding and beveling. Know other models of TR120 machines. Related Posts.
Jan 17, 2019nbsp018332Industry 4.0 continues to make inroads into all aspects of metalworking, including grinding. To turn a grinding machine into an Industry 4.0 smart grinding system, Norton Saint-Gobain Abrasives introduced the Norton 4Sight process monitoring and diagnostics system.