Glebar's versatile precision grinding machines are workhorses which require a smaller footprint than similar machines yet excel in demanding high production environments where the name of the game is high volume at low cost, with exceptional precision. Below are selected case studies demonstrating how our machines excel at grinding Carbide:
Glebar Company’s position in the machine tool industry is driven by its solution orientated leadership and skilled engineering staff. Market studies have indicated a healthy growth cycle in the specialty carbide cutting tool industries especially in the aerospace sector. Glebar identified this opportunity and introduced a new machine platform, the GT-610 EZ Thrufeed Centerless Grinder. This machine was designed specifically for the thru-feed processing of carbide cutting blanks with the intention of meeting a certain price point for that industry.
Narrow grinding wheels are used applying more pressure to the part wearing the wheel out faster. Multiple thrufeed grinds are required occupying skilled operators and accelerating wear on the grinding machine and tooling. Legacy machines are extremely large in comparison to the small diameter of the carbide cutting blanks and take up valuable square footage on the manufacturing floor.
Carbide is one of the hardest metals on Earth, ranging in hardness between 65 and 85 Rc, and after sintering has a rough surface finish and chips easily making it difficult to grind. Deliver a process to grind carbide cutting blanks while maintaining cylindricity of 2 microns over a 4” long part.
To establish a process whereby pre-sintered carbide drill blanks processed in a hot isostatic press (HIP) can be pre-sized to produce straight rod stock for long blanks. The existing method of manufacture involves sintering the carbide rods in a hot isostatic press then grinding them to size in a hard state before the fluting operation is performed. This procedure requires multiple thrufeed grinding operations which is labor intensive and accelerates wear and tear to the grinding machine and tooling since the hard carbide usually has a non-uniform lumpy surface; furthermore several thrufeed passes are need post-sintering to size the carbide to its final diameter and to achieve the uniform diameter required.
Challenge: The customer wants to decrease cycle time while maintaining tight concentricity specifications for roughing a tungsten carbide pin.
Challenge: Satisfying the high volume finishing requirements for the complex form geometry on a hard carbide pin application. This compliments the PG-9DOD Carbide Pin Roughing Operation.
Challenge: To process carbide and polycrystalline diamond with complete automation, conserving grinding wheels and using little power, all on a machine within a small footprint
Challenge: To end grind printed circuit board carbide drill blanks used by a major tool manufacturer to qualify the blank before fluting. The existing method relied on a batch process where parts were placed, a stack at a time, into a fixture and surface ground. Control over the length was highly dependent upon the setup of each batch in the machine, and length adjustment and perpendicularity were cumbersome to adjust for small diameter parts. Existing machines on the market were extremely large in comparison to the small diameter of the part to be processed, and were very expensive.
Below is a sample of Carbide components Glebar has ground over the years. Please contact us and send us your drawing for a personal consultation.
Found at the highest end of the GT‐610 series spectrum, the GT‐610 CNC High Precision Automated Infeed/Thrufeed Centerless Grinding Machine excels at grinding a wide range of materials and is the complete "lights‐out" solution for applications where a high degree of automation, data gathering and gauging feedback is required. In addition to our 10" work wheel design, Glebar is now offering an ABEC 7 twin-grip work wheel spindle design (with 12" work wheel option) on the GT-610 CNC for increased rigidity, faster component processing speed and larger diameter parts.
The GT-610 Automated Infeed/Thrufeed Centerless Grinding Machine can be custom fitted with automation. This system is the ideal option for when infeed applications do not require a CNC dresser and for the vast majority of thrufeed applications. The GT-610 excels at hard metals and composites, producing carbide blanks, spools, bushings, and engine components such as automotive fasteners and valve lifters. It can also effectively size down metal bars.
The GT-610-SD is a highly automated infeed/thrufeed multiple pass machine with a cleaning station, inline gauging and automatic size compensation, designed for use on hard materials. This machine is ideal when a high degree of data gathering is required along with a desire to limit consumable usage. Applications include PCD drill bits and hard carbide components for drilling industries. It is available with enclosure (as shown).
The GT-610 EZ is the newest addition to the GT Series Centerless Grinder suite. A lean version of the GT-610, the GT-610 EZ brings slide motion control to the operator at an affordable price point. Operating on a much smaller footprint than the competition, this system excels at thrufeed grinding hard materials such as steel, carbide, pcd inserts and technical ceramics. Slide positioning allows for precise diameter control on close-tolerance components. The machine is also capable of gauge feedback for even more precise diameter control.