Regarding the rough grinding of PDC Cutter, it is generally necessary to use a diamond grinding wheel for grinding. In actual application, Vitrified Diamond Wheel for PDC Cutter is the best choice. We will explain it in the following chapters.
2 About PDC Cutter
PDC (polycrystalline diamond composite) is a composite superhard material sintered by diamond micropowder and tungsten-cobalt cemented carbide substrate under high temperature and high pressure conditions. The thin diamond layer on its surface has extremely high hardness, high wear resistance and thermal conductivity; the cemented carbide substrate has high strength and certain toughness, providing good support for the diamond layer, overcoming the problem of easy breakage of diamond under impact, which can be said to be a strong combination.
In high-intensity application fields such as oil drilling, coal mining, and geological exploration, polycrystalline diamond composite (PDC Cutter) is widely used in drill bit manufacturing due to its extremely high hardness and wear resistance. However, the high hardness of this “industrial tooth” also puts more stringent requirements on its grinding tools.
3 Difficulty of Grinding PDC
PDC structure: It is composed of a composite of surface polycrystalline diamond (PVD or CVD) and a cemented carbide (WC-Co) substrate, with extremely high hardness (microhardness of diamond layer ≥ 80 GPa).
This special material combination brings dual challenges to the grinding process:
On the one hand, the extremely high wear resistance of the diamond layer will cause rapid wear of conventional grinding wheels, greatly shortening the tool life;
On the other hand, the two seemingly contradictory requirements of high material removal rate and good surface quality need to be met simultaneously during the processing. Specifically, under the premise of ensuring processing efficiency, thermal and mechanical damage during the grinding process must be controlled to avoid defects such as microcracks in the diamond layer, while ensuring that the surface finish of the machined surface meets the precision requirements of Ra0.2μm or less.
4 Why Vitrified Diamond Wheel for PDC Cutter Is Best Choice In Rough Grinding
Vitrified bond grinding wheels have significant technical advantages in the field of PDC composite sheet processing, making them the preferred solution to replace traditional resin bond diamond grinding wheels. From the two key dimensions of processing economy and processing accuracy, vitrified bond grinding wheels have shown excellent performance.
4.1 Reduce Grinding Costs By Vitrified Diamond Wheel for PDC Cutter
In terms of reducing grinding costs, the superiority of ceramic diamond bond grinding wheels is mainly reflected in their ultra-long service life and excellent heat resistance. Due to the use of special ceramic bonding phase materials, this type of grinding wheel can still maintain stable grinding performance under continuous high temperature conditions, avoiding the softening failure problem that resin bonds are prone to in high temperature environments.
In the actual processing process, ceramic bond grinding wheels can withstand longer continuous operations, and the effective processing time after a single dressing can be more than 3 times that of resin diamond grinding wheels.
This excellent durability directly translates into significant cost advantages. According to actual production verification, the unit cost of processing PDC composite sheets with ceramic bond diamond grinding wheels can be reduced by 40%-60% compared to resin diamond grinding wheels, which can bring considerable economic benefits to enterprises in mass production scenarios.
4.2 Ensure Dimensional Accuracy BY Vitrified Diamond Wheel for PDC Cutter
In terms of ensuring machining accuracy, the ceramic bond grinding wheel ensures the stability of the machining process with its unique material properties. The ceramic material itself has high rigidity and thermal stability, which enables the grinding wheel to maintain a good geometric shape during high-speed grinding and effectively control machining vibration. Specifically, the processed PDC composite sheet has higher dimensional consistency, the thickness tolerance can be stably controlled within ±0.015mm, and the end face runout does not exceed 0.01mm. This kind of precision stability is particularly important for demanding application scenarios such as oil drilling, which can ensure the performance and reliability of the final product.
4.3 Comparison Of Resin Vs Vitrified Grinding Wheels
5 Commonly Used Vitrified Diamond Wheel For PCD Cutter Parameters
Vitrified diamond grinding wheels used for rough grinding of PDC (diamond composite surface) are mostly 1A1 diamond external cylindrical grinding wheels, suitable for high-rigidity equipment. Common specifications are as follows:
Recommended grit size
140/170 or 170/200: for coarse grinding, taking into account both efficiency and surface quality.
6. Grinding wheel life and processing quantity
In the field of PDC composite sheet processing, there are significant differences in the processing performance of ceramic bond diamond grinding wheels. Taking the ceramic bond grinding wheel with an outer diameter of 400mm, a thickness of 50mm, and a working ring width of 10mm commonly used in industrial production as an example, its actual processing capacity will vary by orders of magnitude depending on the application scenario.
In the field of oil drilling, since PDC composite sheets usually use high-grade diamond powder and a special sintering process, its composite layer has higher hardness and wear resistance, resulting in a single grinding wheel that can only complete 200-300 pieces of processing tasks. In contrast, the processing of PDC composite sheets for ordinary geological drilling shows a completely different efficiency performance. The processing volume of a single grinding wheel can reach more than 1,000 pieces, and even exceed the 10,000 piece mark under optimal working conditions.
The technical factors that cause this huge difference are mainly reflected in the following aspects:
First, there are significant differences in the composite layer design of PDC composite sheets from different manufacturers, including differences in thickness (usually between 0.5-2mm) and hardness (up to HRA90 or above);
second, the quality grade of diamond raw materials directly affects the difficulty of grinding. The wear resistance of diamond micropowders from SMD grade to DMD grade may differ by more than 30%;
finally, external factors such as the mechanical rigidity of the processing equipment (spindle runout ≤0.01mm), cooling system efficiency (recommended flow ≥20L/min) and process parameter optimization (line speed 15-35m/s) will also have a decisive impact on the life of the grinding wheel.
In an actual production environment, the combined effect of these factors may cause the service life of the grinding wheel and the unit processing quantity to fluctuate by 3-5 times or even more. For example, when processing PDC composite sheets for ultra-high hardness oil drill bits, insufficient cooling may cause the grinding wheel life to be shortened by more than 60%.
Therefore, it is recommended that users should not only consider the basic specifications of the grinding wheel when selecting the model, but also combine the specific processing object characteristics, equipment conditions and process requirements to determine the optimal grinding wheel formula and technical solutions through professional grinding tests. Professional grinding wheel suppliers usually provide customized solutions, including binder formula adjustment (metal/resin/ceramic composite), diamond concentration optimization (25%-150% adjustable) and particle size ratio design, etc., to ensure the best cost-effectiveness and processing efficiency.
Summary
In the field of PDC diamond composite sheet manufacturing, high efficiency, low cost and batch consistency are the core demands of the company’s sustainable development. The use of ceramic bond diamond grinding wheels can not only significantly improve processing accuracy, but also help companies achieve intelligent manufacturing transformation.
As a professional PDC processing solution provider, newdiamondtools is committed to providing customers with high-performance ceramic diamond grinding wheels, covering all kinds of needs for PDC composite sheets and drill bit processing. With our flexible customized formulation capabilities, precise non-standard size processing and efficient delivery system, we ensure that customers get the best grinding solutions. If you encounter any technical challenges in the PDC composite sheet grinding process, our professional team is ready to provide you with technical support and services.
