Nc machine tools how to choose a suitable cemented carbide cutting tools?
From:Taian Haishu Machinery Co.,Ltd. Updatetime:2016-1-26 10:20:02 Views：
Nc machine tools how to choose a suitable cemented carbide cutting tools?
Nc machine tools how to choose a suitable cemented carbide cutting tools?
In the past decade, with polycrystalline cubic boron nitride (PCBN) blade close groove for hardened steel parts fine processing has gradually replaced the traditional grinding groove processing.The Index of the company's bidding project manager Tyler Economan said, "in general, grinding groove is a more stable machining method, can provide higher dimensional accuracy than cutting processing. However, people still hope to be able to finish on a lathe and machining all kinds of."
The hard material, however, is a relative, the concept of change.Some people think that is 40 to 55 HRC hardness of workpiece material belongs to hard materials;While others think that the hardness of hard material should be followed, 58, 60 HRC or higher, in this category, PCBN cutting tools can be.
Through induction hardening processing parts, the surface hardened layer thickness of 1.5 mm, hardness of 58-60 HRC, and below the surface of materials are generally much more soft.In this case, the most important is should ensure that cutting are below the surface hardened layer.
Clamping groove cutting blade shank should be as short as possible, to maximize the shortened length of overhanging, increase tool rigidity.Iscar company GRIP product manager Matthew Schmitz, points out that in general, monolithic cutting tool is more suitable for cutting machining of hardened materials.However, the company also provides modular cutting processing system., "he says," modular the handle can be used for the cutting tool is easy to suddenly die machining occasions, at this time you don't have to change the handle, and need to replace a less expensive components. Modular handle can also provide a variety of processing options. Iscar Grip modular system can install a variety of different products. You can use a handle is equipped with seven different blade, used for processing and 7 kinds of product line, or are equipped with an arbitrary number of blade, used for processing the same product lines with different groove width."Sumitomo electric type is used for clamping CGA blade shank made to blade back seat at the top of the clamping way, the handle with one side fastening screws to help improve the holding stability and prolong tool life.The company design department assistant manager Rich Maton said, "this kind of hilt is dedicated to hardening workpiece cutting processing. If the blade in China mobile, with the passage of time, the blade will wear and tool life will change. For the automotive industry of high productivity machining requirements (such as each cutting edge processing 50-100 or 150 artifacts), the predictability of the knives' service life is particularly important, the change of the knives' service life can cause great influence on production."
Commonly used cutting blade machining hardened steel parts including simple square, forming the blade, blade slot blades, etc.Usually, cut into the groove with good surface finish, because they have a plenty of cooperate part, have a plenty of o-ring or snap ring groove.Mitsubishi materials company product expert Mark Menconi said. "these can be divided into the inner groove machining and outside groove machining, but most of the fine cutting cutting processing is required, including from the light touch of cutting depth is about 0.25 mm fine cut to cutting depth is about 0.5 mm fine cut."
CBN inserts for dry cutting is one of the reasons, although its heat resistance is very good, but in the case of temperature fluctuation processing performance will be discounted.Economan said. "in fact, when the CBN blade in contact with the workpiece materials, cutting heat is produced in the blade, but due to the poor adaptability of CBN inserts on temperature changes, so it is difficult to fully cool enough to keep a constant temperature condition. CBN hardness is very high, but the brittleness is also very big, may be due to the change of temperature burst."
When using hard alloy, ceramic or PCBN blade cutting low hardness of steel (e.g., 45 to 50 HRC), should make the chip as short as possible.This can effectively remove in the process of cutting tool materials in cutting heat, because chip can take away a lot of heat.
In order to cover a wider range of processing range, PCBN inserts brand in growing.Hardness higher grades allows to improve the cutting speed, and toughness better grades can be used to more unstable machining environment.For continuous or intermittent cutting, can also adopt different PCBN blade number.Sumitomo electric Maton pointed out that, because of the large PCBN cutting tools brittle when machining hardened steel, sharp blade cutting edge is easy to crack."We must protect the cutting edge, especially in the intermittent cutting, the cutting edge preparation should be larger than when continuous cutting, the cutting Angle should be bigger."
No matter what type of processing groove, rely mainly on grinding way before the finish machining of hardened steel parts workshop, can all be converted to use PCBN cutting tool in cutting process to increase productivity.Hard cutting processing can achieve almost the same grinding dimensional accuracy, greatly shorten the processing time at the same time.
