Products Description

This is a CNC custom-machined sus420 burr manual coffee grinder burr for our clients, featuring excellent grinding performance and a rust-resistant, durable cutter head. SUS420 martensitic stainless steel, renowned for its high hardness, wear resistance, and precision machining compatibility, is ideally suited for manual coffee grinder grinding plates. Its processing requirements include low-speed operation and adjustable clearance, ensuring both precision and practicality.

manufacturing process

Pre-treatment of billet: SUS420 stainless steel round bar is selected as billet, which is annealed at 800-900℃ to reduce the hardness to HB≤230, which not only eliminates the internal stress of the material, but also facilitates the subsequent cutting. After that, the flat or conical base plate is roughly turned by a numerical control lathe, and a finishing allowance of 0.1-0.2mm is reserved at the same time, which lays the foundation for the subsequent tooth pattern processing.
Fine grinding of grinding disc tooth pattern: manual grinding machine mostly adopts conical or flat-blade grinding disc, among which conical grinding disc is more suitable for manual type. When machining a conical grinding disc, use a five-axis CNC machining center to mill the spiral tooth pattern, so as to ensure the uniform tooth pitch and meet the requirements of manual rolling and grinding at low speed; The flat-knife grinding disc processes radial tooth patterns through a three-axis CNC milling machine. Wear-resistant cemented carbide tools are used in machining, and low cutting speed and sufficient coolant are used to avoid surface burning due to high temperature during SUS420 machining.
Heat treatment strengthening: this is the key process to improve the wear resistance of SUS420 grinding disc. Heat the grindstone with processed teeth to 980-1050℃ for oil cooling quenching, so that the hardness can be raised to about HRC50, and then temper at 150-370℃ at low temperature, so as to reduce the residual stress after quenching, avoid cracking of the grindstone during manual grinding, and maintain high hardness to prolong the service life.
Finishing and adaptation processing: the tooth surface and mating end surface of the grinding disc are finely ground with a CNC grinder to reduce the surface roughness and avoid powder sticking; Aiming at the adjustment mechanism of manual grinding machine, the installation datum plane and positioning structure of finishing grinding disc ensure that the spacing between grinding discs can be adjusted smoothly, so as to meet the grinding requirements of coffee powder with different thicknesses. Finally, CNC polishing equipment is used to remove the burr on the tooth edge to prevent the coffee beans from being scratched during grinding.
Finished product inspection: the dimensional accuracy and form and position tolerance of the grinding disc are detected by a three-coordinate measuring instrument, and the consistency of tooth patterns is verified by a tooth profile detector; At the same time, the manual assembly test is carried out to check the smoothness of the relative rotation of the grinding disc and the stability of the gap adjustment, so as to ensure the uniform powder output during grinding and meet the use standards of the manual coffee grinder.

The core formula for selecting burr by scene

Coffee machines used in different scenarios have different requirements when selecting burrs. The following is the core formula for selecting burrs according to the scenario:

Home espresso: CNC flat burr (over 50mm) + stainless steel.
Home hand brewing / multi-function: CNC cone burr (48mm) + stainless steel.
Portable / small amount brewing: ceramic cone burr (38mm) + lightweight design.
Commercial high-frequency use: large-size CNC flat burr (over 60mm) + high-hardness stainless steel.

The choice of coffee burrs ultimately comes down to "flavor requirements" - uniform particle size allows for stable coffee extraction, and stable extraction is the prerequisite for good coffee. CNC-processed metal burrs can achieve micron-level (μm) precision control, with small errors in blade angle and gap, ensuring that each coffee bean is evenly cut (rather than "crushed"), and the fine powder rate can be controlled at 10%-15%.

420 stainless steel has a hardness of up to HRC55-60 (much higher than coffee beans), is highly wear-resistant, and is not easy to rust. It is currently the mainstream choice. It is cost-effective, takes into account durability and grinding precision, and is suitable for home and commercial scenarios (for example, the blades of TIMEMORE and MAVO are mostly made of 420 stainless steel).

This sus420 burr manual coffee grinder burr uses 420 stainless steel as raw material and adopts CNC integrated cutting and molding technology. It is the best choice for hand-cranked coffee machines.

Why choose our CNC machining services?

Company profile

Our company is headquartered in Shaanxi, China. As an OEM manufacturer, we provide a variety of materials CNC turning, CNC milling, grinding, cutting and drilling processes, providing high-quality parts processing services for multiple industries. Strict quality control system and personalized customization services make us a OEM for many industries. Coffee machines are one of the many industries we serve. The coffee machine burrs we manufacture are exported to many parts of the world. Whether it is non-standard burrs or standard burrs, we can process them for you.

High Quality

The parts we manufacture are always delivered to the highest quality standards.

Advanced Equipment

A variety of CNC machining equipment, 3-axis, 4-axis, 5-axis CNC machining centers.

Professional Team

Many experienced CNC machining experts will give you advice.

Custom Service

In addition to specifying packaging and delivery, we also support laser engraving of your brand logo, etc.

Why choose us?

The precision, working range and load capacity of our CNC equipment meet the processing requirements of coffee machine cutter discs. In terms of cutter disc processing, our team has rich experience in how to optimize the processing path and ensure the processing accuracy of key dimensions such as the tooth shape and edge angle of the cutter disc. In addition, we can process most of the materials required for coffee machine cutter discs, such as stainless steel, titanium alloy, etc., including the processing of some special materials. We strictly implement quality management in accordance with international standards such as ISO 9001, and have perfect testing processes and equipment, such as three-coordinate measuring machines, projectors, etc., to ensure the quality of each batch of cutter discs. And we can complete production within the time required by customers. Respond to customer needs and questions in a timely manner, maintain close communication with customers, and ensure accurate understanding of the processing requirements of the cutter disc.

If you need sus420 burr manual coffee grinder burr, please click the inquiry button on the product page to get more information.