Manufacturers Should Keep an Eye on Tungsten Carbide Cutting Tool Wear

Tungsten carbide cutting tool is a kind of consumable product and can wear out during cutting. Its wear can has three types: mechanical wear, thermal wear and chemical wear.
 
During cutting performance, tungsten carbide cutting tools wear out gradually when they cut down chips from workpieces. It has two main forms of wear: abrasion and breakage. Abrasion is gradually generated when tungsten carbide cutting tools conduct cutting performance continuously. Breakage includes brittle breakage and plastic breakage, such as tipping, cataclasm, desquamating and cracking.
 
The tungsten carbide cutting tools, after wearing out, will have lower cutting precision and higher surface roughness, which may result in the rising of cutting force, increasing of cutting temperature and even sympathetic vibration. And when these happen, its cutting ability will be greatly affected. Tools generally have three periods of wear: primary wear period, normal wear period, and rapid wear period. When the cutter has worn out to a certain extent, it can not be used anymore, which is called the blunt point. The time counted from a totally new tungsten carbide cutting tool being put into use to it reaching its blunt point is called tool service life.
 
The breakage of tungsten carbide cutting tools, like abrasion, is also a representation of tool losing its efficiency. If the cutter suffers too much force, it may break quickly and lose its cutting ability. In the above mentioned case, the so-called breakage happens. Actually, breakage is just a kind of abnormal abrasion.
 
When there is abnormal wear in tungsten carbide cutting tools during machining, immediate measures should be adopted, or it may cause workpiece scrap or even machine tool damage, etc. Therefore, manufacturers should keep a close eye on tungsten carbide cutting tool wear condition.
 
Tungsten Carbide Cutting Tool
 

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Tungsten Carbide Turning Tool Sharpening

Tungsten carbide turning tool sharpening should be conducted by adopting correct posture and methods, and paying attention to related safety knowledge.
 
Correct sharpening posture and methods towards tungsten carbide turning tools:
I.Operators shall stand on the side of grinding machines, in case of getting hurts due to grinding wheel burst.
II.Operators shall separate their two hands to a certain distance when holding the tool, and clamp their waist with tow elbows so that shake generated while grinding will be reduced.
III.When conducting major and minor flank grinding, turning tools should be placed at the horizontal center of grinding wheel with tool nose sticking up about 3°~8°. After touching the grinding wheel, the tungsten carbide turning tool should move right and left in a horizontal direction. When the turning tool leaves the grinding wheel, it should rise for a little in case that the cutter edge ground is damaged by the grinding wheel.
IV.When conducting flank face grinding, the back of the toolbar should tilt to the left with a tool cutting edge angle.
V. When conducting minor flank grinding, the back of the toolbar should tilt to the right with an end cutting edge angle.
 
Safety knowledge during tungsten carbide turning tool grinding:
I.Before grinding, operators shall check if there is any crack on the grinding wheel and whether the grinding wheel spindle nut has been tightened. And the grinding wheel should be tried first before being put into use in case that it bursts and hurts operators.
II.Operators shall wear protective glasses during grinding in case that gravel and scrap iron would run into their eyes.
III.Operators shall not stand right in front of the rotating direction of the grinding wheel in case of accidents.
IV.When conducting small tool bit grinding, the tool bit shall be placed into the toolbar so that operators can hold it tightly.
 
Tungsten Carbide Turning Tool
 

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Tungsten Carbide Milling Cutter Milling Types

Tungsten carbide milling cutter has tow types of milling according to the relative position between the milling cutter and the workpiece.
 
When the axis of tungsten carbide milling cutters does not overlap with the symmetrical Centerline of the workpiece milling width, then the milling in this case is called the asymmetric milling, which can be subdivided into asymmetric up milling and asymmetric climb milling. During asymmetric up milling, the cutter teeth cut in with a relatively small cutting thickness while cut out with a larger cutting thickness. This kind of milling way, with stable cutting performance, less impact suffering, can improve the tool durability and surface quality and is suitable for the machining of carbon steel and low carbon alloy steel. The cutter teeth cut out with a relatively small cutting thickness in asymmetric climb milling and thus it is more suitable for cutting materials with low intensity and large plasticity.
 
When the gyration center of tungsten carbide milling tools is in a symmetrical position with the workpiece, then the milling in this case is called symmetric milling. This kind of milling way has relatively larger average cutting thickness, and can avoid the extrusion towards workpiece surface when the cutter cuts in. The milling tool has high durability adopting this milling way. It can ensure that the cutter teeth conduct milling under the chilling layer of machining surface during the finish-milling for the machine tool guideway, which can help achieve relatively high surface quality. This kind of milling way should be given priority in the milling of quenched steel and machine tool guideway. In addition, symmetric milling can generate great vibration, so it requires machine tools with good rigidity.
 
Tungsten Carbide Milling Cutter
 

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Counterfeit Gold-Plated Tungsten-3

He believes these were the only instances where he wrote about possible counterfeit gold-plated tungsten bars before his March 2 column for CoinUpdate.com.  Since last October, there has been ample time for either the Chinese central bank or the US bonded warehouses who supplied them with gold bars to have publicly addressed the rumors of counterfeit gold bars.  None have done so.  This silence could be interpreted two different ways.  If the report of counterfeits is possibly true, the parties involved are just hoping that the story dies down.  Or if the story is false, the parties involved may not have deemed it important enough to give it more widespread coverage by issuing a refutation.

If even a portion of the stories of counterfeit gold-plated bars turn out to be true, governments, central banks, brokerage firms, and owners of the bonded warehouses would have a strong incentive to hush up the information.  In the past decade, a downpour of released unclassified US documents confirm that the US government has lied to the public for a long time about issues related to gold—going all the way back to 1918!  So, he has significant suspicions that the US government today is not being honest about gold trading and inventories.

Bradshaw’s column was pretty much accurate when it cited specifics from his column last week.  But it seems Bradshaw used the column to discuss the issue that really bothered him—the rumors about counterfeit gold bars at Fort Knox—about which he has never before written.  The way Bradshaw wrote his column, more than one reader thought that he might have irresponsibly passed along rumors on this subject as being established fact.  While others, not named in Bradshaw’s column, may have done so, he only accept the credit (and occasional blame) for what I have written.  When you try to be on the cutting edge of breaking information, sometimes you blow it. He thinks I did it properly this time.

By the way, while he is discussing government deception of the public, he does admit that politicians and bureaucrats are frequently truthful.  Despite my suspicious nature, he does believe the testimony before Congress a few months ago by the general counsel for the Federal Reserve.  When Scott G. Alvarez made an unqualified statement that all of the gold supposedly stored in Fort Knox was actually there, even though it has not been audited since the 1950s, he bet that’s true.  However, Alvarez was not asked and did not volunteer any information as to who holds title to the gold stored at Fort Knox.  he has significant suspicions that some of it is owned by other parties as a result of gold swaps, particularly the German central bank.

tungsten-gold-plated-bar


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Tungsten Carbide Formed Turning Tool Introduction

Tungsten carbide formed turning tool is a specialized tool for solid of revolution formed surface machining, and its cutting edge shape is designed according to the work piece outline. With formed turning tool, a formed surface can be processed through only one cutting stroke. It is easily operated and has high efficiency. The precision of the formed surface has nothing to do with workers’ skill, but depends on the precision of the cutting edge of turning tools. It can ensure the consistency and interchangeability of the work piece surface shape and size precision. Its processing precision can reach IT9—IT10 while the surface roughness about Ra6.3—Ra3.2. Formed turning tools can be reground for many times, thus has relatively long tool life. However, the design and manufacture of this kind tool is quite complicated and costly, and therefore, it is mainly used in the volume production of small tools and accessories.
 
Tungsten carbide formed turning tools can be classified into several types as follows:
I. Flat formed turning tool
This kind of turning tool is strip-shaped, which is similar to general turning tools. It is easily to be manufactured and low in cost but allows for only a few times of regrinding. It mainly applies to the machining for simple outer formed surface, such as thread turning tool.
II. Prismatic formed turning tool
The tool bit and cutter bar of this kind of turning tool are manufactured separately, which greatly increases its regrinding times along the rack face. It has rigid cutter body, but its manufacturing technology is more complicated than that of the circular formed turning tools, and it can be used only in the machining of outer formed surface.
III. Circular formed turning tool
This kind of turning tool looks like a cylinder wrapped by a prismatic formed turning tool. It allows for the most regrinding times and its manufacture is relatively easy to be conducted than prismatic formed turning tools. In addition, it can machine both the inner and outer formed surface of work pieces.
 
Tungsten Carbide Formed Turning Tool
 

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