Besides turning machining , the milling process is also developed and used by many companies in precision mechanical processing. That has confirmed the position of milling machining in the current mechanical market. So if you are still wondering or have questions about milling, please follow the article below of P69 Mechanical Factory to answer all your questions!
What is milling machining?
Metal milling is actually a method used to cut workpieces in precision mechanical processing. The formation and development of milling technology has brought many benefits in the mechanical industry, both making the processing of complex parts simpler and reducing dependence on human hands. .
Shaping motion of milling machining
Metal milling generally has two forming movements including:
– The main movement, also known as the cutting motion, is the circular milling cutter movement.
– The feed motion, also known as the feed movement, is the reciprocating movement in three directions: vertical, horizontal and vertical. The reciprocating action can be performed separately or simultaneously depending on the operator.
Applications of milling machining in practice
As mentioned above, the technological capabilities of milling are very wide and they also have the ability to extend the technology of the milling machine in many different ways such as making more jigs, etc. Using the milling method to perform:
– Flat milling: the most common method.
– Milling cylindrical face.
– Thread milling.
– Milling groove, Milling keyway….
– Keyshaft milling
– Milling of profiled faces
Advantages and disadvantages of milling method
Any method has its pros and cons. Here are the pros and cons of milling machining, let’s take a look!
Today, with the development of technology, machines, specifically CNC milling machines, have brought many advantages to metal milling processing methods. Some of the advantages of metal milling are as follows:
– High accuracy, complicated details no longer make it difficult for workers. Product quality is also increasingly improving as well as serving more advanced requirements.
– Reduce time and effort for workers, increase labor productivity.
– Minimize waste compared to other cutting methods.
– Cost savings for implementers.
– Apply automation and mechanization.
Besides the above advantages, milling method also has some disadvantages such as:
– Some machine parts when processed by metal milling will be expensive or may not be manufactured.
Milling is difficult to apply to thin parts because they are easily broken during cutting. Normally, the metal workpiece must have a thickness of 0.8mm or more to apply the milling operation.
The cost of CNC milling machines is quite expensive.
Classification of milling methods
Here are 2 popular milling methods, let’s have a look!
1. Forward milling method
A method of cutting metal workpieces in which the reciprocating movements of the milling cutter and the part are in the same direction. Forward milling methods are often used for finishing milling because they improve the surface roughness of the product and provide high productivity when milling with small residues.
Features of forward milling:
– The cutter is extended life and side by up to 50%, thereby reducing the cost of tool change.
– The cutting depth of the tool is gradually reduced, so roughness can be improved and no slippage occurs.
– When performing milling, the cutting force is always on the workpiece, so it makes machining the jigs easier and cheaper.
– The metal forward milling method is difficult to apply to metal parts with hard shells such as hot rolled steel…
– Forward milling will bring good machining efficiency when the milling machine has good decontamination and the table wedge is also tightened.
– Knife is easily chipped, milling machine life is low due to strong impact of cutting gas, cutting from thickness to thin.
– The forward milling method is often used for finishing milling because they help to improve the surface roughness of the product and provide high productivity when milling with small residuals.
2. Reverse milling method
For reverse milling, when operating the milling cutter and the part will move in the opposite direction.
Reverse milling is characterized by:
– The reverse metal milling machine runs quieter due to less impact.
– Knives are less prone to chipping than forward milling by conducting cutting from thin to thick.
– High-yield roughing
– Common application on old milling machines due to the removal of machine dirt.
– Slippage occurs when the feed amount is small
– When cutting, the cutting force always tends to pull the metal workpiece up, so the clamping force is large.
– The metal workpiece may be clamped and interfere with cutting.
– Metal reverse milling is mainly applied in rough milling.
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