cnc parts

How to grind the Four-flute end mill

four flute end mill
four flute end mill

End mill sharpening key points
1. Key points, for slotting: radial rake angle, core thickness, helix angle, slot length, cylindrical toughness bandwidth, the grinding wheel fillet, groove type requirements;
2, the key points of the Zhou edge: radial back angle, blade diameter, blade length, circumferential blade width, diameter jump, inverted cone;
3. The key points of the end edge: the front rake angle, the rear rake angle, the end kernel width, the blade inclination angle, and the end jump;
4, the key points of the backlash: chisel edge, over-center amount, backlash angle, tooth expansion and exit, bottom corner arc, fusion depth, fusion angle, grinding wheel selection, length of the front surface of the ball head slotting;
5, other key points: ball head, arc, taper, chamfer, cut, go high, profile, passivation, appearance.

For end mills, in general, with a small number of blades and a large chip flute, the discharge of chips can be relatively smooth, but at the same time, the cross-sectional area of the tool is small, the rigidity of the tool body is low, and the tool body is prone to bending during cutting . Conversely, if the number of blades increases and the cross-sectional area of the workpiece increases, the rigidity of the cutter body will increase, but the chip-holding groove will become smaller, and the chip-receiving force will decrease, which will easily lead to chip clogging and reduce the surface finish of the workpiece. The shorter the blade, the more rigid the blade body and the better the cutting performance. The rigidity of the end mill is inversely proportional to the third power of the blade length. Therefore, if the blade length is doubled, the rigidity of the blade body will be reduced to 1/8 of the original.

In actual on-site processing, customers mostly use 4-blade end mills to process planes, steps, etc. 4-blade milling cutters use right-to-right-cut spiral cutter teeth, so that chips are discharged from the front end of the milling cutter when processing materials, 4-blade milling cutters It has a good chip evacuation effect, increases the cutting rake angle, reduces the amount of chips, and facilitates the cutting of materials. Therefore, 4-edge end mills are widely used in mold processing and automobile parts production.

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What is the difference between end mills and ball end mills?

End mills and ball end mills, one for the ball head, one for the flat bottom, the end mill for the main machining, the ball end milling cutter for the curved surface. Ball-end milling cutters and end mills are brought out and can be machined. Our company buys the tool grinding machine of Tuol machinery, which has a very good grinding effect.

Tapered Ball Nose End Mill Tungsten solid carbide Coated Tapered cone cnc milling cutter woodworking engraving bits

Shank diameter: 6mm

Total length: 50 75 100

Material: Tungsten Carbide

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What is the end tooth that passes through the center on the end mill?

A tooth is over the center, that is, the end edge is beyond the center position. When is the note to work, allow me to give an example. When the keyway milling cutter is utilized to mill the keyway, if there is no tooth over the center, there will be a high point in the middle of the milled slot, so the 2-blade keyway cutter is a pair of teeth. All over the center.

If the milling cutter is working with a circumferential tooth, then the end tooth is not important at the center. Generally speaking, when we produce the tool, the odd-numbered edge milling cutter has a tooth over center and an even-numbered edge milling cutter with a couple of teeth passing through the center.
2-blade cutter sometimes has a pair of centers, sometimes a tooth that passes through the center.

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How to choose end mill to improve the efficiency of mold processing

In general, we will select the end mill from the following three points:
1. Select the type of CNC tool coating according to the type and hardness of the machined workpiece. For the processing of workpieces with hardness below HRC55 such as carbon steel, the TIALN coating of KHC tungsten steel milling cutter is optional. When processing workpieces with quenching and heat-treating materials up to about 60 HRC, ALTIN ​​Coatings are available. In the processing of workpieces with higher hardness, the tool shape, carbide material and coating can be selected for high hardness processing TISIN coating for high hardness HRC65 materials.
2. Select the shape of the end mill neck according to the shape of the machined workpiece. The neck shape of the ball end mill is divided into standard type, long neck type and long edge type, and extended shank type, which can be chosen according to the processing depth and shape of the workpiece. Long neck type (deep groove milling cutter) can be used for deep digging, and the angle of interference should be considered when selecting. At the same time, compared with the long neck type, the stretched edge type end mill has high rigidity, which can improve cutting conditions and achieve better machining accuracy.
3. Select end mills with unique ball head precision according to machining accuracy. Ball end mills typically have a circular arc accuracy of 10 μm, but there are also 5 μm high-precision end mills that can be used for high-precision machining.

  • Use of new ultra-fine fine tungsten steel bar grinding, high rigidity and toughness.
  • Wide application:High efficiency maching can be achived ranging from common copper maching.
  • Optimized structure:Approiate cominbation of sharp cutting edge and tool strength makes cutting easier and faster,extending tool life.
  • Versatile product series:Suitable for rough maching with high metal removal rate to finish maching with high surface quality.
  • Complete diameter range:Minium diameter of 0.25mm for maching of the smallest parts.
  • Use of excellent new blade shape, the surface is smooth, not easy to collapse, to enhance the rigidity of the tool, taking into account the rigidity of the tool and chip removal performance, making the cutting tool and chip more stable.
  • Round handle, chamfering, easy to use, increase the stability of the performance.
  • Tough and wear-resistant.
  • High strength and hardness.
  • Durable in use.
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What is the difference between end mills and key milling cutters?

The difference between end mills and keyway cutters:
1. The end mill is generally four-bladed and three-bladed, and the keyway cutter is two-blade (favorable to ensure the diameter accuracy after re-grinding);
2. The main cutting edge of the end mill is designed on the circumference. The end face is on the cutting edge, and the main cutting edge of the keyway milling cutter is on the end face, and the cutting edge is on the circumference.
3. Therefore, the end mill should not be constituted axially. It must be used. It can be a tendency into the knife or spirally. The amount is not so large, because the chip pocket on the cutting edge is shallow. The keyway milling cutter feeds in the axial direction.
Therefore, it will wear near the end, mainly re-grind the end, and the cutting edge will not re-grind to ensure the matching precision of the machining groove (H9, N9).

Augusttools Cnc Endmill Carbide Cutting HRC55 3 Flutes Milling Cutter Roughing End Mill Metal Cutter Aluminum Copper Processing

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Face milling and End milling

face milling and end milling

Face milling

“Face milling” is used for machining planes on vertical milling machine, end du milling machine or gantry milling machine. There are cutter teeth on the end face and the circumference, and there are also coarse teeth and fine teeth. Its structure has integral type, insert type and indexable type.

Face milling cutters have a cutting edge on the end face and outer circle perpendicular to the arbor, which are mainly used for milling planes. The cutting edge of the outer circle is the main cutting edge, and the cutting edge of the end face plays the same role as the scraper. Face milling cutters have shorter blades than sleeve end mills.

High-speed steel face milling cutters are generally used to process medium-width flat surfaces. The standard milling cutter diameter range is 80 ~ 250 mm. The cutting efficiency and processing quality of carbide face milling cutters are higher than that of high-speed steel milling cutters, so at present, hard alloy face milling cutters are widely used to process planes

Face milling cutters are mainly used for processing planes, which are characterized by: high production efficiency; good rigidity, can use a larger feed; multiple cutter teeth are involved in cutting at the same time
Sharpening, good working stability; adopting rigid inserting structure, easy to sharpen and replace the cutter teeth, and long tool life.
Face milling cutters are divided into two categories, one is to fix the hard alloy blade to the cutter teeth by brazing, and then install the cutter teeth on the cutter body of the milling cutter. This is called an insert-type face milling cutter; second The class is to directly install the hard alloy blade on the cutter body of the milling cutter, and then fix it with screws, etc. This is called the indexable clamp milling cutter. The face milling cutter has two axial rake angles and a radial rake angle. The direction of the two rake angles is selected according to the material and cutting conditions of the object to be processed, that is, positive +, negative -, or zero.

The tools for processing flat workpieces are mainly face milling cutters, whose cutting edges are covered with circumferences and end faces. Among them, the cutting edge of the end face is an auxiliary cutting edge. The diameter of the face milling cutter is large, so the cutter teeth and the cutter body are usually separated when the cutter is selected, so as to achieve the purpose of long-term use.

Choice of face milling cutter diameter

(1) The surface area is not large. When choosing a tool, pay attention to choose a tool or a milling cutter with a diameter larger than the width of the plane, so that a single plane milling can be achieved. When the width of the plane milling cutter reaches 1.3 to 1.6 times the width of the processing surface, it can effectively ensure the better formation and discharge of chips.

(2) When the area of ​​the processing plane is large, it is necessary to select a milling cutter with an appropriate diameter and mill the plane multiple times. Among them, the diameter of the milling cutter will be limited due to the limitations of the machine tool, the depth and width of the cutting, and the size of the blade and tool;

(3) When the machining plane is small and the workpieces are scattered, an end mill with a small diameter needs to be selected for milling. In order to maximize the processing efficiency, the milling cutter should have a diameter of 2/3 in contact with the workpiece, that is, the diameter of the milling cutter is equal to 1.5 times the width of the milling. In down milling, the reasonable use of the ratio of the tool diameter to the cutting width will ensure that the milling cutter has a very suitable angle when cutting the workpiece. If you are not sure whether the machine tool has enough power to maintain the cutter at such a ratio, you can divide the axial cutting thickness in two or more times to maintain the ratio of the cutter diameter to the cutting width as much as possible.

End milling

“End milling” is used for smaller planes. It is mainly used for processing grooves and stepped surfaces. The cutter teeth are on the circumference and the end surface, and they cannot be fed in the axial direction during work.

End milling is one of the most used milling cutters on CNC machine tools. Both the cylindrical surface and the end surface of the end mill have cutting cutters. They can be cut simultaneously or separately. Mainly used for plane milling, groove milling, step face milling and profiling milling.

End milling can be used as face milling. However, because the main declination angle is 90°, the force of the tool is mainly radial force in addition to the main cutting force, which is easy to cause deflection and deformation of the arbor, and it is also easy to cause vibration, which affects the processing efficiency. Therefore, except for similar to the thin-bottom workpiece Except for special reasons such as small axial force or occasional face milling, which is occasionally necessary to reduce the variety of tool stocks, it is not recommended to use an end mill to machine flat surfaces without steps.

The application range and requirements of high-speed steel end mills are relatively broad, and even if the cutting conditions are slightly improperly selected, there will not be too many problems. Although the carbide end mill has good wear resistance during high-speed cutting, its use range is not as wide as that of high-speed steel end mills, and the cutting conditions must strictly meet the requirements of the tool.

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