Tungsten Dart News & Info

Tungsten Carbide Indexable Insert Technical Requirements

Details: Category: Tungsten Information; Published on Thursday, 23 October 2014 16:12

The technical requirements of unpunched tungsten carbide cutting tools or that with a circular hole or counter bore are as follows:

I. The blade back flate’s inward concave should be not more than 0.05mm, while the outward concave not more than 0.03mm.

II. The blade’s fundamental plane only allows inward concave with value not more than 0.05mm in unpunched tools or tools with a circular hole, while allows outward concave with a value not more than 0.03mm in tools with a counter bore.

III. There should not be any defects unfavorable to usage on tungsten carbide indexable insert surface as well as defects in the cutting edge part.

IV. The main properties and structure of blades should accord with the regulations in YB849-75 Tungsten Carbide Grades or other relevant standards.

V. The cross-section part of blades should be in uniformity without any defects that may do harm to usage.

VI. Materials newly developed or introduced should be of higher properties than what stipulated in YB849-75 standards or accord with companies recommended values.

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Tungsten Carbide Cutting Tool Precautions

Details: Category: Tungsten Information; Published on Thursday, 23 October 2014 16:10

When using tungsten carbide cutting tools , operators should pay attention to some precautions as follows:

I. Tungsten carbide cutting tools are made from hard and brittle materials, therefore, diamond grinding wheel should be applied in the finish machining.

II. Due to its material characteristics of hardness and brittleness, the tungsten carbide cutting tool may break when suffering from great impact or clamp force.

III. Tungsten carbide has relatively low coefficient of thermal expansion, therefore, when produced into hot or cold external members, if there are significant differences between the operating temperature and design value, cracks may come into being.

IV. Tungsten carbide cutting tools must be kept in a dry place, because the cutting fluid or other kinds of fluid may corrode it and thus reduce its tool intensity.

V. During the copper brazing of tungsten carbide blades, if the copper brazing temperature is too high or too low, the blade may fall off or generate cracks.

VI. After the tungsten carbide cutting tool grinding, operators should check carefully whether there are cracks or not on the surface.

VII. After the electromachining of tungsten carbide cutting tools, operators should check whether there are cracks or not on the cutter surface, or it may have a bad influence on the cutter intensity. If necessary, the cracks can be eliminated through accurate grinding.

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The Introduction of Tungsten Gold Plated Bar

Details: Category: Tungsten Information; Published on Thursday, 23 October 2014 08:48

Tungsten gold plated bar is bar made of tungsten and plated by gold. They are widely used as substation of gold bar as memento, jewelry and so on.

Tungsten gold plated bar has the properties of tungsten, which are high density, durable, hardness, oxidization resistance, and weak radioactive. What’s more, tungsten gold plated bar is environmental-friendly, which has been a reason for the popularity of people all over the world.

Tungsten gold plated bar has the surface of gold, which is smooth and bright as copper mirror, and able to reflect the images which are next to it. They are gold color, which is attractive and pleasant to eye.

Tungsten gold plated bar can be not only manufactured with gold plated only, but also with letters engraved on it. And the letters can be chosen by customers or engraved according to customers’ drawings.

tungsten-gold-plated-bar

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Tungsten Carbide Boring Tool Usage

Details: Category: Tungsten Information; Published on Wednesday, 22 October 2014 17:53

Special attention must be paid to tool cleanliness during the tungsten carbide boring tool installation. In every link of installation and fitting, the boring tool, whether used for roughing machining or finish machining, should be well cleaned.

Boring tools should be preset to well meet the requirements in dimensional accuracy and serviceable condition. The presetting can be done in a specialized presetter or other measurement instruments.

Dynamic pulse check should be done after boring tool installation. The dynamic pulse check is an aggregative indicator which reflects the precision of principal axis of machine tools, tool precision and the connection precision between tools and machine tools. If the precision is 1/2 or 2/3 higher than the required precision of the holes being processed, the machining should be stopped at once and reasons must be found out and solved before the machining being continued.

The service life of every part of a tungsten carbide boring tool should be confirmed through statistics or testing methods to ensure the reliability of machining precision.

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Tungsten Carbide Taper Reamer Introduction

Details: Category: Tungsten Information; Published on Wednesday, 22 October 2014 17:51

The tungsten carbide taper reamer has three basic types; 1:50 taper reamer, 1:10 taper reamer and 1:30 taper reamer.

The standards of tungsten carbide taper reamers: GB4248-84,GB1136-84 and GB1137-84.

The tungsten carbide taper reamer is typically used in the reaming of dowel holes of the same taper, such dowel holes with taper of 1:50, 1：30 and 1：10.

Geometric angles of tungsten carbide taper reamers:

I. Tool cutting edge angle

An angle of 15°is generally adopted in the machining of ductile materials like steel, while an angle between 3°~5°in fragile materials like cast iron. An angle of 45°is often adopted in roughing reaming and blind hole reaming, while an angle between 0.5°~1.5°in hand reamer reaming.

II. Anterior angle

There are usually small margin and thin chips during reaming. An anterior angle of 0° is often adopted for the convenience of manufacture, however, it can be 5°~10° when machining ductile materials in order to reduce chip deformation.

III. Clearance angle

The reamer is a type of finish machining tool, and in order to avoid great changes in radial dimension after regrinding, an angle between 5°~10° can be adopted.

IV. Tool cutting edge inclination

The tool cutting edge inclination of reamer is normally 0°. It can contribute to a stable cutting process and improve hole quality.

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Tungsten Carbide Cutting Tool Precautions

Details: Category: Tungsten Information; Published on Wednesday, 22 October 2014 17:50

Tungsten carbide cutting tools may generate relatively high cutting temperature and much dust and aerosol when being used in machining. There will be much harm to health if our eyes or skins have direct contact with them, let alone inhaling them. Therefore, when using tungsten carbide cutting tools, operators should pay attention to the following matters:

I. Using local dust exhaust apparatuses, such as masks, gloves and so on.

II. Hands should be cleaned immediately once exposed to dust.

III. Do not have meals in the workplace.

IV. Using dust collectors or other washing methods to remove the dust on clothes instead of dusting oneself off by hand.

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Tungsten Carbide Floating Reamer Shank Introduction

Details: Category: Tungsten Information; Published on Wednesday, 22 October 2014 17:48

The tungsten carbide floating reamer shank can be applied in boring millers or CNC machining center machine tools, which adopts a structure specially designed, enabling the shank to float along the axial direction or vertical direction or even both. In this way, errors caused by thermal deformation of machine tools, workpiece setting,etc. can be compensated. It is mainly used in the processing occasions where high accuracy reaming is needed.

Currently, the machine tool are increasingly improving its accuracy, however, it is still quite difficult to obtain a high degree of concentricity between the principal axis of machine tool and the hole to be reamed. One reason for the concentricity deviation of the principal axis is the overheat of bearing. Reamers are required to be able to go into holes completely and be free from any radical force, and the tungsten carbide floating reamer shank is designed out of this purpose.

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Tungsten Carbide Floating Reamer Introduction

Details: Category: Tungsten Information; Published on Wednesday, 22 October 2014 17:46

There are two kinds of understanding towards the tungsten carbide floating reamer in the field of machining. The first kind of understanding is that the reamer can float along the axial direction or vertical direction or even both. What calls for special attention is that the floating reamer is completely different from the floating boring tool. The rotation of the former comes from the cutter itself, while the latter from the workpiece. The second understanding is that it is a kind of adjustable reamer with its diameter being able to have some minor adjustments. Relatively speaking, the second understanding is closer to the real meaning of “floating” in the term of floating reamer.

The tungsten carbide floating reamer itself cannot float; it actually floats with the help of its reamer shank which adopts a structure specially designed, enabling the shank to float along the axial direction or vertical direction or even both. In this way, errors caused by thermal deformation of machine tools, workpiece setting,etc. can be compensated.

Tungsten carbide floating reamers are normally applied in boring millers or CNC machining center machine tools, as well as the processing occasions where high accuracy reaming is needed. It is also widely used in areas like automobile engine, marine engine, hydraulic pressure, medical treatment, energy, and so on.

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The Differences Between Real and Fake Gold 2

Details: Category: Tungsten Information; Published on Wednesday, 22 October 2014 08:48

Sound

Another classic test is the "ring test". Drop the coin on a hard countertop to hear it's "ring". Gold and silver have very distinctive tones and qualities of sound, which are fairly easy to distinguish. The saying "it rings true" and the song Bing Crosby sang "Silver Bells" testify to this quality. Metals like lead have a dull thud. Even the sound of a tungsten slugged gold coin will sound different. It's best to have a known genuine coin around for comparison (and be sure to note the issue, date and mint mark to avoid confusion with the coin being tested).

Electronic Testing

Electronic testing runs a current through the coin to test the resistance and determine the purity of the metal. High quality testers like this can work and they are mainly used for buying jewelry, not coins.

Destructive Testing

The easiest destructive test is the scratch test, which does what the name suggests, scratches the surface of the coin to see if the color is the same underneath. This identifies those fakes that are stamped coins plated with gold. Gold plated coins also have a tendency for the details of the coin to fill in with the plating. Look carefully at the detail of coin with a 10x magnifier and compare it with a genuine coin, if you have one.

The touchstone is the other classic way to test gold. The edge of the coin is run along a stone so a very small amount of the gold leaves a "trail" on the stone. Acid of various strengths is dripped on this trail to determine the purity of the gold.

gold

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Tungsten Carbide Spiral Flute Tap Introduction

Details: Category: Tungsten Information; Published on Tuesday, 21 October 2014 17:43

Tungsten carbide spiral flute tap, as a type of thread machning tool, is named according to its spiral-shaped flute. It can be classified into two categories according to different directions of turning: left-handed spiral flute tap and right-handed spiral flute tap. The left-handed spiral flute tap removes its chip downwards during tapping, thus is more suitable for through holes; the right-handed spiral flute tap removes its chip upwards during tapping, thus is more suitable for blind holes.

The characteristics of tungsten carbide spiral flute taps are as follows:

I. Ability to perform tapping down to the deepest part of blind holes.

II. Ability to go deep into the bottom holes more easily.

III. Good machinability.

Tungsten carbide spiral flute taps adopt different helical angles according to different working conditions. The most common ones adopted are right-handed 15°and 42°. Generally speaking, the larger the angle is, the better the chip removing is performed.