Product category:
Tool and cutter manufacturing
News Release from: Koerber Schleifring UK | Subject: Studer S32 HSG and Ewag grinding machines
Edited by the Manufacturingtalk Editorial
Team on 23 January 2006
Make a carbide step drill in three
stages
Usually the making of step drill out of tungsten carbide is a complex task, but it can be done in three elegant and economical steps, thanks to teamwork in a grinding technology group.
Manufacturing a step drill out of tungsten carbide is a complex task, but it can be done in three elegant and economical steps Studer and Ewag give an impressive demonstration of how teamwork operates within the German Schleifring Group
This article was originally published on Manufacturingtalk on 29 Sep 2005 at 8.00am (UK)
Related stories
Twenty four grinding machines displayed at EMO
At the EMO 2005 the Schleifring Group exhibited 24 grinding machines including a Studer single-pur-pose centre grinding machine for grinding chamfers and full angles on carbide metal blanks.
CNC grinder improves pump case quality
Jan-Oliver Roehrl speaks to the Schleifring's 'Motion' magazine about the use of a CNC vertical spindle internal grinding machine at the Bosch plant in Czech Republic, to improve performance and produ
The process runs on three machines: the new Studer SL1 center grinding machine - a world first - is used first to prepare the carbide blanks.
They are then contoured using high-speed peel grinding on the Studer S32 HSG machine, after which Ewag's Ewamatic Line gives them their final shape as a finished step drill.
Special customised software is used to ensure that the stages of the process are smoothly integrated.
Further reading
Compact grinding centre drills and mills too
Compact grinding center designed especially for the complete machining of relatively small parts features an automatic tool and wheel changer and can be used for drilling and milling tasks.
Grinding replaces broaching and milling
A cost-effective alternative - that replaces the broaching and milling with grinding - has been developed for the process used to manufacture a variety of steering gear racks.
User-friendliness won CNC surface grinder deal
The user-friendliness of a new surface and profile grinding machine, with Easy Drive and language-free, symbol-based operation, was the main factor that convinced a toolmaker to purchase it.
The individual stages: * Process 1 - full center or chamfer grinding on the blank using the SL1.
The Studer center grinding machine, which is specially designed to grind chamfers and full centers, is easy to operate.
It is PLC-controlled and has two axes.
The Z-table and B-axis are adjusted manually.
Blanks are machined by first setting the B-axis to 45 deg.
The 2 x 45 deg chamfer is then ground with an oscillation cycle.
The next stage is to swivel the B-axis to 60 deg, rechuck the workpiece and grind the 120 deg tip.
This is also done with an oscillation cycle.
The advantage of using a single-purpose machine is that conventional grinders normally used for this can be used for other more demanding jobs.
* Process 2 - peel grinding the contour with the Studer S32 HSG.
The S32 HSG production cylindrical grinding machine has an infinite variable automatic swivel axis and two motor spindles.
This set-up allows two grinding wheels to be used at speeds of up to 150m/s - perfect conditions for the high-speed grinding of tungsten carbide.
The software used in this case is StuderGRIND.
The workpiece contours that are required to produce the geometry of the blanks and finished parts on the S32 HSG can be programmed using the StuderContour software.
The first grinding wheel roughs the workpiece, then the second one finish grinds it to the final dimension.
The S32 HSG has a high metal removal rate which makes the machine extremely efficient.
* Process 3 - final machining for the step drill on the Ewag Ewamatic Line.
The 6-axis CNC controlled Ewamatic Line grinding center has been specifically designed for the production and regrinding of highly complex precision tools using state-of-the-art materials such as super-hard CBN or PCD.
It achieves accuracies within the micron range.
It also gives outstanding results on rotary tools and indexable inserts made from HSS or tungsten carbide.
The first stage of machining the workpiece consists in programming with Ewag NUMROTO Plus software and simulating the grinding process in two or three dimensions.
Once everything is correct the groove is ground.
This is followed by relief grinding, gashing and grinding the radial relief point.
Measurement of the finished step drill completes the process.
Teamwork between Studer and Ewag has advantages for the customer: one contact/project manager for the entire process solution optimised set-up and processing times leading to reduced production costs the highest quality and precision in the workpiece service from a single source for the whole process provided by Schleifring Service.
• Koerber Schleifring UK: contact details and other news
• Email this article to a colleague
• Register for the free Manufacturingtalk email newsletter
• Manufacturingtalk Home Page
Search the Pro-Talk network of sites
