CNC cutting tools in stock supply

CNC cutting tools in stock supply

Our company provides milling cutter bottom edge, side edge, round nose tool, bottom edge and R-angle grinding, ball cutter grinding, drill bit and tap grinding, step drill bit, chamfering tool grinding. The accuracy can reach within 0.005mm, and old resources can be utilized. When using a new tool, the lifespan can reach over 90%, greatly saving customers' tool costs.
The company has high-precision four axis tool grinders for grinding tools, meeting the precision requirements that customers are concerned about. Welcome everyone to the company to discuss business.

CNC cutting tools in stock supplyTechnical essentials:

1、 Tool material

Common tool materials used in tool grinding include high-speed steel (HSS), powder metallurgy high-speed steel (PM-HSS), hard alloy (HM), and superhard materials such as PCD, CBN, and metal ceramics. High speed steel cutting tools are sharp and have good toughness, while hard alloy cutting tools have high hardness but poor toughness. The density of hard alloy cutting tools is significantly higher than that of high-speed steel cutting tools. These two materials are the main materials for drill bits, cutters, milling cutters, and taps. The performance of powder metallurgy high-speed steel is between the above two materials, mainly used for manufacturing rough milling cutters and taps.

High speed steel cutting tools are less sensitive to collisions due to their good material toughness. But hard alloy cutting tools have high hardness and brittleness, are sensitive to collisions, and the cutting edge is prone to bouncing. Therefore, during the grinding process, it is necessary to be very careful in the operation and placement of hard alloy cutting tools to prevent collisions between tools or tool drops.

Due to the relatively low precision of high-speed steel cutting tools, their grinding requirements are not high, and their prices are not high, many manufacturers set up their own tool workshops for grinding. But hard alloy cutting tools often need to be sent to a grinding center for grinding. According to statistics from the grinding center, over 80% of the tools sent for repair are made of hard alloy.

2、 Tool grinder

Due to the hardness of the tool material, grinding is generally the only way to change its shape. There are several common tool grinders used in the manufacturing and grinding of cutting tools, including:

1. Grinding machine: Grinding the grooves or backs of cutting tools such as drill bits and end mills.

2. Top grinding machine: Grinding the conical top angle (or eccentric back angle) of a drill bit.

3. Trimming machine: Correct the cutting edge of the drill bit.

4. Manual tool grinder: grinds outer circles, grooves, backs, corners, transverse edges, flat surfaces, front cutting surfaces, etc. Commonly used for cutting tools with small quantities and complex shapes.

5. CNC grinding machine: generally five axis linkage, with functions determined by software. Generally used for grinding large quantities of tools with high precision requirements but not complicated, such as drill bits, end mills, reamers, etc. The main suppliers of this type of grinder come from Germany, Switzerland, the United States, Australia, and Japan.

3、 Grinding wheel

1. Abrasive grain

Grinding wheels and grains of different materials are suitable for grinding tools of different materials. The size of abrasive particles required for different parts of the tool also varies to ensure the combination of edge protection and machining efficiency.

Aluminum oxide: used for grinding HSS cutting tools. Grinding wheels are inexpensive and easy to modify into different shapes for grinding complex cutting tools (such as corundum).

Silicon carbide: used for correcting CBN grinding wheels and diamond grinding wheels.

CBN (cubic boron carbide): used for grinding HSS cutting tools. High price, but durable.

Above, the grinding wheel is represented by B, such as B107, where 107 represents the size of the abrasive grain diameter.

Diamond: Used for grinding HM cutting tools, expensive but durable. The grinding wheel is represented by D, such as D64, where 64 represents the size of the abrasive grain diameter.

2. Shape

In order to facilitate the grinding of different parts of the tool, the grinding wheel should have different shapes. The most commonly used ones are:

Parallel grinding wheel (1A1): grinding top angle, outer diameter, back, etc.

Disc shaped grinding wheel (12V9, 11V9): Grinding spiral grooves, milling cutters' main and secondary cutting edges, trimming transverse edges, etc.

After a period of use, the grinding wheel needs to be corrected in its shape (including plane, angle, and fillet R). The grinding wheel must be regularly cleaned with a cleaning stone to remove the chips filled between the abrasive grains in order to improve the grinding ability of the wheel.