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Tungsten Carbide Taper Reamer Introduction

Details: Category: Tungsten Information; Published on Wednesday, 22 October 2014 17:51; Written by xjq; Hits: 524

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; Written by xjq; Hits: 490

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 Introduction

Details: Category: Tungsten Information; Published on Wednesday, 22 October 2014 17:46; Written by xjq; Hits: 520

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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Tungsten Carbide Floating Reamer Shank Introduction

Details: Category: Tungsten Information; Published on Wednesday, 22 October 2014 17:48; Written by xjq; Hits: 525

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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The Differences Between Real and Fake Gold 2

Details: Category: Tungsten Information; Published on Wednesday, 22 October 2014 08:48; Written by Sherry; Hits: 513

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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