Metal stamping parts processing technique is introduced at a high speed
A, cutting tool choice: when machining hardened mould, correct selection of cutter is very important.
There are three basic types of milling cutter: ball milling cutter head, round cutter head, and sharp corners milling cutter head.
Usually, the preferred tool is a ball end mill.
Ball head of big circular arc shape can be dispersed when the high speed machining hardened metal effect on the blade cutting force and cutting heat, and processing of the curved surface is relatively close to the required shape.
If the cavity has a large, flat bottom, in the ball end mill after rough machining, should use the rounded flat milling cutter, the cutting tool of force and heat dispersion effect than the ball end mill is poor.
Light Angle flat cutter used in processing the part of the need to clear the root, is in the ball end mill or rounded corners milling cutter head had been cut out of the allowance as much as possible before qing root, the blade Angle of the light of this tool is easy to crack.
Tool rigidity is very important, in order to increase the rigidity of the small diameter cutter, the diameter of the handle is doing a much larger than the diameter of a cutting tool, to improve the processing finish and prolong tool life;
Tool clamping overhanging length should be as short as possible.
Secondly, the shape of the handle should be adapted to the structure of the mould.
Often should keep the side of the cutter and workpiece periods of half a degree and the side of the workpiece is 3 ° incline, for example, is the shape of the handle to make 5/2 °, so as to obtain the maximum rigidity.
If face to face with the side of the workpiece is 90 °, the handle thin neck structure should be adopted.
Second, reducing cutting heat: too much heat cutting will make the workpiece deformation, reduce machining accuracy.
Dongguan metal stamping parts to reduce heat every time a method is to control the feeding of spacing.
For rough machining, the feeding distance S should be equal to 25% ~ 40% the diameter of the cutter.
For the finishing, the feeding distance is calculated according to the given mark height H.
Feeding distance determines the size of the each blade cutting the length of time in every turn to participate in, or not to participate in cutting time is the length of the cooling time, so what determines the heat accumulation in the cutting tool.
Feeding spacing is large, the blade cutting time in each turn, cooling time, less heat build-up, tool temperature;
On the other hand, the small feeding distance is restricted heat generation and accumulation.
Therefore, by adjusting the size of the cutter spacing walk, can control the temperature of the heat and the cutting tool, and further improve the cutting speed and the cutting temperature is still lower than coating can withstand the highest temperature.
On the other hand, you can also choose a new coating, can make the tool cutting temperature, the higher the use of higher cutting speed.
The highest artifacts such as TiCN coating temperature is 400 ℃ (
While TiAIN is 800 ℃ (
, due to its good heat resistance, so the TiAIN coating is more suitable for high speed machining of hardened mould.
Cutting speed and feed are also the key factor for control of heat, thick chip away more calories, less heat for artifacts.
If the chip is too thin, extrusion friction causes the workpiece heating cutter on the parts.
In addition, the cutting of large cross section can prolong tool life, improve production efficiency.
Three, cutting tool durability and clamping: with a blunt tool must be timely replacement, so how to judge the tool wear?
Usually by the naked eye observation: when cutlery is blunt, when cutting tool bit parts will turn red, show that force and temperature has been overloaded.
At the beginning of this burning red color only on the tip of a large quantity of parts and material removal, now no, when to dull as you can see the parts of the cutting tools for red.
For easy to see the red, you can turn off the machine lighting.
Correct clamping cutter is very important to the hardened mould processing, dongguan hardware stamping parts that related to the handle of the tolerance, the handle and cutter holder, and the diameter of installed jump and other factors.
The handle and the cutter holder proper fit tolerance ensures clamping rigidity, accuracy and consistency.
To this end, the handle of the manufacturing tolerance should be 0.
0025 mm to 0.
005 mm, clamping structure should be suitable for thermal shrinkage;
And the standard tolerance up to 0.
0125 mm, which can lead to excessive radial runout.
In addition, the handle of the roundness should keep at least + 0.
After clamping the radial runout of cutting load caused by uneven, some of the blade load is big, and the other part of the blade load is small, the latter is the most taboo hardened mould processing.
Caused by diameter jump vibration causes of machine tool chatter and cutter blade, so we will strictly control tool diameter jump, don't put the handle should be paid attention to and polishing, because the handle polishing can reduce the reliability of clamping.
Four, high performance of machine tools: in high efficiency machining hardened mould, should not ignore the requirements for machine tools, although the hardened workpiece is also available in a backward on the machine of low speed, but the efficiency is very low.
If the machine tool spindle rotational speed is low, then the corresponding feed speed is also low, so the use of good rigidity, high precision machine tool can achieve good effect.
Mold processing machine tool numerical control system to deal with a large amount of data, dongguan hardware stamping parts considering to buy a new machine to focus on the performance of the numerical control system, the high feed speed, the system should have high addition, deceleration compensation ability.
Machine tool processing efficiency but also with the speed of data processing, the speed of the servo system response, the interpolation arithmetic speed, the resolution of the feedback system related to the factors such as the quality of the moving parts.
Five, the programming essentials: when processing mould, namely the status of the cutting tool force depends on the knife's cut to the numerical control programming, therefore, programming is one of the key to efficient machining hardened steel.
Die cutting tool path should use helical interpolation, the cutting process is stable.
Or spiral cut from the side will not be used in occasions, oblique wave, should be adopted to avoid the axial roll.
Programming also determines the size of the radial feed and cutting depth.
On an essay: introduction of metal stamping parts