July 27, 2017

Application of carbide cutting tools in automobile processing

How to optimize the drilling cycle without affecting the processing safety? Which processing strategy will shorten the cutting cycle by a second or two? These are the major challenges facing the auto industry.

How to deal with these challenges and the characteristics of drilling and threading processes in the automotive industry. Generally speaking, the materials used in the automobile industry are regular, mainly cast iron,carbide cutting tools,cast steel and forging.But the structure of the workpiece is extremely complicated, and the production efficiency, tolerances and surface quality of the workpiece are also very challenging.

If from these challenges,a series of turnkey tools are provided for the typical thread of the specific hole type and engine cylinder block, cylinder head, shell and crankshaft.

Dealing with complex car applications

460 - XM CoroDrill twist drill with 140 degrees point Angle, good centering function and smaller thrust, CoroDrill 460 - XM can provide excellent performance in many applications. The stability of tool life is beneficial to ensure reasonable inventory. Fine cemented carbide materials ensure a balance of hardness and toughness, good wear resistance and good service life. Two steps can be accomplished through a process that greatly benefits complex automotive applications.

Applicable to a wide range of applications

Diameter: 3-25mm (0.118-1.016-inch)

Drilling depth capacity: 8 times diameter

Internal cooling fluid and external coolant

Standard classification and carbide cutting tools

It is suitable for the large diameter drop hole which is required by the automobile industry

CoroDrill 400 straight flute drill with 120 degrees point Angle is optimized and is suitable for the complicated steps borehole diameter. Due to the support of the complex transitional form between the step holes, the drill can provide maximum performance when drilling the cylinder block and cylinder cover. Compared with the conventional spiral flute, the CoroDrill 400 is well suited to the machining of the step hole which is common in the automobile industry.

The CoroDrill 865 crankshaft oil hole drilling can provide an efficient solution for automobile iron parts and steel parts (especially crankshaft). CoroDrill 865 a series of characteristics, such as reduced apex Angle (more accurate centering), optimization of the Angle and first Angle characteristics (feed can be higher, chip removal more smoothly), increases the blade belt width (stability), update the spiral groove type (chip forming,carbide cutting tools strength higher) more effectively,make the production efficiency and tool life are improved.Adopting effective processing strategies and matching with controlled coolant or MQL is the key to ensuring success.

Posted by: hannahgwendolyn at 09:38 AM | No Comments | Add Comment
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July 12, 2017

Simple method for making tungsten drill bits on one’s own efforts

How do you find the proper carbide drill? Number of drilling machine parts for quenching far a matter, but often encountered in the work, such as: stamping die interrupt the socket head cap screw, or car rear plate spring and so on, it's about 45 HRC hardness, generally have difficulty in drilling bit out, and present the right carbide drill to buy less than, here introduces a simple method of self-made tungsten drill bits.

 

If less than 2 mm of carbide blade can be found,such as lathe operator with thin cut blade, if differences comfortable again,available general carbide insert the right to use the blade to cut thread cutting machine,and then press the appended drawings style of welding on the corresponding round bar, pipe's such as drill hole a little bit small,at least as large as the aperture. It can be used after manual roughing.If the diameter of the borehole is accurate, it can be used for grinding (tool grinding machine) and then grinding out the cutting geometry and chip groove by hand. And the drilling top Angle is slightly smaller than the normal bit, should be fixed with a small horizontal blade, make the hole easily hollow, prevent wobble. This type of drill can only be used for drilling hardened parts with deep holes. Socket head cap screw is broken in the hole, for example, bit diameter can be ground into a bit smaller than the bolt diameter is ok, such as drill M10 of screw, grinding to diameter Ø 7.8 ~ Ø 8. The maximum speed can be used when drilling holes. Just can't long time drilling,to keep back drill chip removal: drill pipe cooling appropriately, prevent oxygen welding the blade loss due to high temperature, the other main point can be reference to "hardened steel drilling are described.

In addition,tungsten drill bits is zero and negative front Angle, which is precisely the front Angle feature of hard alloy blade when cutting high strength materials and rough machining.

 

At present due to the evolution of cemented carbide manufacturing technology,fine grain of material to make the toughness of tungsten drill bitsis improved greatly, advanced coating technology makes the bit cutting performance is greatly improved, and the innovation of the cutting tool structure made up for the inadequacy of cemented carbide manufacturability is poor,which can produce large size and complex blade bit.

 

So in recent years, some famous foreign tool company, such as Walter, Kennametal, Sandvik, Seco has successively introduced all kinds of solid carbide drill bits, such as solid carbide drill bits, drilling of deep hole length to diameter ratio is as high as 70, it USES the XD technology, can be drilled in the process of deep hole without return, cooling through the cooling hole inside, and do not require any special cooling device), indexable insert carbide drill bit and removable nipple type products, such as covered with small diameter, large diameter and large length to diameter ratio, and other fields, due to its high efficiency, long life and high quality and a bit more than half a markets, especially in the production of some modern high degree online, traditional HSS twist drill has faded from people field of vision, gradually replaced by high productivity of cemented carbide drill.Therefore,tungsten drill bits are the trend of the future bit development.

Posted by: hannahgwendolyn at 09:24 AM | No Comments | Add Comment
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July 03, 2017

Research on cemented carbide end mills of Profile Based on its maintenance and selection

There are two main types of milling methods for carbide end mills' direction and rotation direction of milling cutter:
The first type is the milling,the rotation direction of the milling cutter and the cutting direction of the feed are the same, and the milling cutter holds the workpiece and cuts the final chip in the beginning of cutting.
Inverse milling,the second is the direction of rotation of the milling cutter and cutting feed direction is opposite,cutter before start cutting must be slipping a on the workpiece,start with cutting thickness is zero, the cutting at the end of the maximum cutting thickness.
When milling,the workpiece is pressed to the workbench by cutting force,and the workpiece is removed from the worktable during milling.Because of the best cutting effect of milling,it is usually preferred to milling,only when the machine has the problem of thread clearance and the problem of unsolved problem.
The cutting edge of carbide end mills should bear the impact load every time it enters the cutting.The load size depends on the cross section,workpiece material and cutting type of the chip. In the ideal condition, the diameter of the milling cutter should be larger than that of the workpiece, and the axis of the milling cutter should always be slightly away from the center line of the workpiece.When the cutter is placed in the cutting center, it can easily produce burrs. Cutting edge into the cutting and cutting out the direction of the radial cutting force will continue to change, machine tool spindle can vibration and damage, the blade may rupture and processing surface will be very rough, hard alloy cutter slightly off center, cutting force direction will no longer fluctuations, cutter will receive a pre load.
Maintenance of carbide milling cutter
When the axial line of carbide milling cutter or the edge line of the workpiece is superimposed or close to the edge of the workpiece, the situation will be serious,and the operator should do the relevant equipment maintenance work.
1. Check the power and rigidity of the machine to ensure that the required milling cutter diameter can be used on the machine tool.
2. The weight of the cutter in the spindle is as shortest as possible,reducing the impact of the milling cutter axis and the position of the workpiece on the impact load.
3. The suitable for the process of the correct cutter tooth pitch,to ensure that did not too much during the cutting blade mesh and artifacts caused by the vibration at the same time, on the other hand,in the narrow artifacts or milling milling cavity to ensure that there are enough blades and workpiece mesh.
Make sure to use every blade in order to get the correct cutting effect when the chip is thick enough to reduce the knife wear.The forward corner slot can be used to achieve a smooth cutting effect and minimum power.
5. Select the diameter of milling cutter suitable for workpiece width.
Choose the right major Angle.
Place the milling cutter correctly.
8. Use cutting fluid only if necessary.
Follow tool maintenance and maintenance rules and monitor tool wear.
The maintenance of carbide milling cutter can prolong tool life and improve work efficiency.
Choice of carbide milling cutter
Milling stainless steel in addition to the vertical milling cutter and cemented carbide end mills and the parts of the cutter material,the rest of the all kinds of milling cutter adopt high speed steel, especially high tungsten, molybdenum and vanadium high speed steel has a good effect, the tool life than W18Cr4V 1 ~ 2 times. The hard alloy plate for making stainless steel mill is YG8,YW2,813, 798, YS2T, YS30, YS25, etc.
The effect of spray cooling method is most obvious,which can increase the durability of milling cutter more than double. If the normal 10% emulsion cooling is used,the cutting fluid flow should be guaranteed to be fully cooled. When the carbide milling cutter is milling stainless steel, the Vc = 70 ~ 150m/min, Vf = 37.5 ~ 150mm/min, and it should be adjusted according to the alloy plate number and the different materials.
The adhesion of stainless steel and strong melting ability are easy to stick to the blade of the milling cutter,making the cutting condition deteriorate. In reverse milling, the blade starts to slide on the hardened surface, increasing the trend of working hardening.The impact and vibration of milling are larger, and the cutter blade is easy to be broken and worn.
When machining stainless steel, the cutting edge should be sharp and bear the impact. Can use the big spiral Angle cutter (cylindrical milling cutter, end mill), spiral Angle b increased from this, the tool life can be increased by more than 2 times, because work at the moment of the milling cutter rake Angle g0e by 11 ° increased to more than 27 °, milling fast. But b value should not be again big, especially the vertical milling cutter with b 35 ° or less advisable, so as to avoid weakening the blade.

For more details just visit our website at http://www.wococarbide.com/


Posted by: hannahgwendolyn at 09:33 AM | No Comments | Add Comment
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