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Tungsten Carbide Gear Shaving Cutter Introduction

Details: Category: Tungsten Information; Published on Tuesday, 28 October 2014 17:59; Written by xjq; Hits: 597

Tungsten carbide gear shaving cutter is a kind of finish machining cutter used in the involute cylindrical gear machining. When doing gear shaving, the cutting edge of gear shaving cutters shaves a thin layer of metal along the workpiece surface, which can effectively improve the precision and gear surface quality of the gears being shaved. It has high machining efficiency and long tool life and thus is the most widely used tool in the mass production of cylindrical gears with medium precision.

In the teeth surface of tungsten carbide gear shaving cutters, there are many narrow grooves. The cutter cuts beard-shaped thin chip from the gear surface during machining, which is the origin of its name. Generally, it is applied to do finish machining towards gear teeth after gear hobbing and shaping.

Tungsten carbide gear shaving cutters, used to machine inner and outer cylindrical gears with straight teeth and helical teeth, can achieve a high productivity and good surface finish of workpieces. There are also turbine gear shaving cutters for machining sophisticated turbines, whose basic worm types and parameters should be the same as that of the working worms matching with the turbine. Just like the gear shaving cutter, it also has many narrow grooves on the helicoid to form the cutting edge and hold chip. Turbine gear shaving cutters are difficult to manufacture, and thus they are used only when machining of turbines with high precision requirements is needed.

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Tungsten Carbide Slotting Cutter Introduction

Details: Category: Tungsten Information; Published on Tuesday, 28 October 2014 17:58; Written by xjq; Hits: 546

Tungsten carbide slotting cutter, a type of gear machining tool, is gear-shaped or rack-shaped. It can be used in machining inner gearing and outer gearing spur gears and helical gears through generating method.

The precision of standard tungsten carbide slotting cutters can be divided into class AA, class A and class B according to the international standard. Normally, they are used to machine gears with precision of class 6, class 7 and class 8 respectively. Gears that need shaving or grinding again for the needs of machining should adopt pre-shaving or pre-grinding slotting cutters respectively to ensure there is a certain amount of machining allowance on the gear surface. Therefore, the teeth shape of these slotting cutters needs special design.

Tungsten carbide slotting cutters can be classified into four types according to its shape: disk, bowl-shaped, cylindrical, taper-shank. Disk slotting cutters are mainly used in machining inner gearing and outer gearing spur gears, helical gears and herringbone gears. Bowl-shaped gears are generally used to machine inner gearing spur gears with circular bead, which are different from disk slotting cutter in that when they work, nuts can be placed inside the slotting cutter and thus will not hamper machining. Cylindrical slotting cutters are used in machining inner gears and outer gears with small modules. Taper-shank are mainly used in machining inner gearing spur gears and helical gears.

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Tungsten Carbide Reamer Reaming

Details: Category: Tungsten Information; Published on Monday, 27 October 2014 18:52; Written by xjq; Hits: 517

Tungsten carbide reamer is the most widely used tungsten carbide cutting tools in hole machining, which mainly consists of cutter diameter, shank diameter, cutting cone length, cutting cone angle, cutting length, total length, and so on.

Tungsten carbide reamer reaming refers to the semi-finish and finish machining towards the existing holes to achieve precise hole size, good surface roughness, etc. During reaming by tungsten carbide reamer, in order to get hole precision needed, the reamer diameter should correctly selected, and thus the expansion margin decided by workpiece material and machining condition should be taken into consideration. In order to obtain good finish machining surface, in addition to the adopting of high precision reamer, the correct cutting condition should also be provided.

Tungsten carbide reamer precision mainly depends on its diameter and radial run-out. As for cutting condition, it is better to adopt tungsten carbide blade low-speed cutting, but at the same time the upper limit value should be taken in the consideration of machining efficiency.

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Tungsten Gold Plated Bar Story -- Aliens hunting for gold on Earth? 2

Details: Category: Tungsten Information; Published on Tuesday, 28 October 2014 08:43; Written by Sherry; Hits: 552

“We are at the heart of this global control because of our mineral resources,” he said.

On the first day of the conference, all the speakers agreed that like humans who had the potential to be both good and bad, so too was the population of galactical beings.

Extra-terrestrials were also not dissimilar to politicians, who pushed their own agenda for material gain.

“They came to Earth looking for gold. We are all still obsessed with gold,” he said.

The research, according to Tellinger, showed that the extra-terrestrial “Annunaki” came to Earth around 300,000 years ago to look for gold, and that they were also responsible for cloning their own genetic structures and creating mankind.

tungsten-gold-plated-bar

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Tungsten Carbide Gear Hob’s Basic Worm Introduction

Details: Category: Tungsten Information; Published on Monday, 27 October 2014 18:51; Written by xjq; Hits: 501

Tungsten carbide gear hob’s bilateral blades is the intersection between the rake face and the lateral shovel surface, and it is located on the spiral surface of the worm, which is also called the basic worm of hobs. The basic worms of tungsten carbide gear hobs include three types as follows:

I. Involute worm

The tungsten carbide gear hob made by using involute worm has no teeth shape error and the gear being cut has higher precision. However, the hob manufacturing is more difficult with it.

II. Archimedes worm

It is more simple and convenient to manufacture a tungsten carbide gear hob with a Archimedes worm, as well as to test the hob teeth shape. However, there exists small teeth shape error. Fortunately, this kind of error is within the permitted range. Therefore, most of the basic worms of finish tungsten carbide hob in production are Archimedes worms instead of involute worms.

III. Straight sided normal worm

There is larger teeth shape error in tungsten carbide gear hob with straight sided normal worms instead of involute worms. Therefore, straight sided normal worms are often used in multithread hobs and roughing hobs.