What are the technical requirements for CNC milling cutter
s? 1. The hardness of the non-cutting part of the CNC milling cutter should be 40-45HRC, and the hardness of the cutting part should be 63-67HRC. There should be no decarburized layer and insufficient hardness on the cutting part. 2. For welded integral milling cutter heads, air holes and water penetration are not allowed in the welding place. After welding, the blanks used as milling cutter heads should be annealed and subjected to fracture and torsion tests. The steel used as the cutting part should be gold Phase analysis to determine whether it is the same as the microstructure of standard steel. 3. The surface roughness, size and tolerance of each part of the CNC milling cutter should conform to the design drawings, or the requirements of the national standard. 4. The cutting of the CNC milling cutter should be sharp, and there should be no cracks, burrs, collapse and oxidation color. . 5. The non-cutting edge of the CNC milling cutter should be rounded. 6. The taper of the matching hole (2°24') shall be inspected by painting method, and the colored area should be more than 96% of the hole surface. 7. The deviation of the nose diameter, outer cutting and inner cutting of the milling cutter should not exceed ±0.01mm. 8. The deviation of the tip distance W should not exceed 0.008mm. 9. After the knife is sharpened, the cutting edge should be straight, and the deviation of its straightness should not exceed 0.008mm. 10. The radial swing difference between the cutting edge of the outer cutting blade and the inner cutting blade relative to the center line of the milling cutter disc should not exceed 0.008mm. 11. The back surface of the blade should ensure that in any section passing through the centerline of the cutter body of the milling cutter, the cut-off angle of the blade should be the same. A CNC milling cutter is a rotary cutter with one or more teeth used for milling. When working, each cutter tooth intermittently cuts off the margin of the workpiece. Main milling cutters, steps, grooves, forming surfaces and cutting workpieces, etc. Cutting tools in a broad sense include both cutting tools and abrasive tools; at the same time, 'numerical control tools' in addition to cutting blades also include accessories such as tool holders and tool holders. CNC milling cutter classification: according to the material (一) according to the material used to manufacture the milling cutter can be divided into 1. High-speed steel tools; 2. Cemented carbide tools; 3. Diamond tools; 4. Other material tools, such as cubic boron nitride tools , Ceramic knives, etc. Structure (2) According to the different structure of the milling cutter, it can be divided into 1. Integral type: the tool and the tool holder are made into one; 2. Inlaid type: can be divided into welding type and machine clamp type; 3. Vibration damping type as a tool When the working arm length and diameter are relatively large, in order to reduce the vibration of the tool and improve the machining accuracy, this type of tool is often used; 4. Inner cooling type: the cutting fluid is sprayed to the cutting edge of the tool from the nozzle through the inside of the tool body; 5. Special types: such as compound cutters, reversible tapping cutters, etc. (3) According to the different structure of the milling cutter, it can be divided into 1. Face milling cutter (also called end milling cutter): There are cutting edges on the circumferential surface and end surface of the face milling cutter, and the end cutting edge is the secondary cutting edge. Face milling cutters are mostly made of sleeve insert structure and blade machine clamp indexable structure. The material of the cutter teeth is high-speed steel or cemented carbide, and the cutter body is 40Cr. Drilling tools, including drills, reamers, taps, etc.; 2. Die milling cutters: Die milling cutters are developed from end mills, which can be divided into conical end mills, cylindrical ball end mills and conical balls There are three types of end mills with straight shanks, flat straight shanks and Morse taper shanks. Its structural feature is that the ball head or end surface is covered with cutting edges, and the circumferential edge is connected with the ball head edge in an arc, and it can be used for radial and axial feed. The working part of the milling cutter is made of high-speed steel or cemented carbide; 3. Keyway milling cutter: used for milling keyway. 4. Forming milling cutter: the cutting edge has the same shape as the surface to be machined.
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