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Tungsten Carbide Hole Boring Cutter’s Structural Improvement (II)

Details: Category: Tungsten Information; Published on Thursday, 06 November 2014 18:35; Written by xjq; Hits: 481

II. Technology consistency improving

(1) Reducing the surface roughness of the cutting edge and rake face to keep the tool smooth, clean and sharp.

(2) Installing the blade firmly. The toolbar should not stretch too far out of the knife rest to avoid toolbar deformation.

(3) Installing the toolbar straightly incase that the toolbar touch the surface processed.

(4) During tool setting, the tool nose of tungsten carbide hole boring cutter should a little higher than centre of gyration of workpiece (but should be controlled within 2mm) to reduce vibration and breaking edge and avoid that the bottom of boring cutter touch the hole wall and reduce machining precision.

(5) As to machine tools, the spindle clearance should be adjusted to the bearing precision.

After the improvement of tungsten carbide hole boring cutter structure and technology consistency, the vibration is reduced, the tool toughness is improved, and the problems of chatter marks, off-size, deformation etc. are basically avoid, which helps improve the machining quality of thin wall inner hole and its machining efficiency.

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Tungsten Carbide Hole Boring Cutter’s Structural Improvement (I)

Details: Category: Tungsten Information; Published on Thursday, 06 November 2014 18:32; Written by xjq; Hits: 496

Tungsten carbide hole boring cutter, applied in coal mining machinery parts processing, may come across parts of many Thin-walled inner hole surface. The machining of thin wall inner hole parts is quite difficult. If tungsten carbide hole boring cutter of common structure is in applied in the machining, workpieces always tend to have chatter marks and off-size and even deformation, and so on, which will result in low machining precision and low machining efficiency.

To ensure the machining quality of parts, the tool design and technology consistency must be improved.

I. Structural improvement

1. Geometric angle setting

(1) In order to increase the tool toughness, clearance angle should be reduced. Also, the second clearance angle should be increased in case that the clearance angle of tungsten carbide hole boring cutters rub workpieces.

(2) When the tool start cutting the workpiece, it suffers great impact load and thus the rake angle should be decreased to reduce impact load.

(3) Reducing tool minor cutting edge angle will have good effect in surface roughness.

(4) Adopting tool cutting edge angel of 91~ 95°and reducing radial force during machining can reduce workpiece vibration.

2. Blade parameters setting

(1) The toolbar size and structure of tungsten carbide hole boring cutter should have high toughness and intensity. In order to avoid chatter marks and cutter back-off during machining, the toolbar diameter of the hole boring cutter should be increased to ensure the tool bar toughness.

(2) Increasing the corner radius, normally not less than 1mm.

(3) Grinding out a chamfer larger than feeding rate f can improve he surface finish of workpieces and reduce vibration.

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Can Cutting Fluid Be Used in Tungsten Carbide Cutting Tool

Details: Category: Tungsten Information; Published on Thursday, 06 November 2014 18:29; Written by xjq; Hits: 528

Tungsten carbide cutting tool normally do not adopt cutting tool for cooling during machining. It is because that tungsten carbide is of high hardness (aboutHRC90), and can allow high cutting temperature (up to 1000℃), so the absence of cool fluid does not affect its cutting. In addition, due to its sensibility towards to shock heating, adopting cutting fluid may caused its tipping.

So, is that true that tungsten carbide cutting tools absolutely do not allow for the adopting of cutting fluid during cutting? The answer is yes, but it is conditional. Operator should pay attention to some points as follows if they want to apply cutting fluid in the cutting:

I. Using oil-based metal cutting fluid with antiwear additive

Oil-based metal cutting fluid has poor heat conduction property, and thus will not cause shock chilling on the tool. Also, oil-based metal cutting fluid can easily stick to the tool and thus help to keep a stationary temperature for the tool.

II. Cooling tungsten carbide cutting tools evenly

The cooling towards cutting tools by cutting fluid should be done evenly in case of tools being hot and cold and finally results in tool tipping.

III. Cooling tungsten carbide cutting tools in the whole process

Before the cutting starts, the operator had better open the cutting fluid in advance and the cooling fluid should be adopted in the whole cutting process without stops.

The cutting fluid, if used properly with the above mentioned points, can not only protect tungsten carbide cutting tools, but also improve the cutting precision, because the oil-based metal cutting fluid, when used in the cutting to cool the tools, can also lubricate the tools and the machining areas of workpieces and thus improve the surface machining quality.

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Tungsten carbide plane cutter planing Introduction

Details: Category: Tungsten Information; Published on Thursday, 06 November 2014 18:31; Written by xjq; Hits: 468

Tungsten carbide plane cutter, with one cutting part, is a kind of cutter that is used in planing. Planing is the most common machining method in unit production. Planer types most commonly seen include shaper, double housing planer and slotting machine. Planing’s main movement is variable speed reciprocating linear motion. Due to the inertia during speed changing, the cutting speed is limited. Also, because planing does not conduct cutting in its return trip, it has relatively low production efficiency. However, planing only requires for simple-structured machine tools and cutting tools which are easy to be installed and adjusted, so it has high universality.

Due to its characteristics, tungsten carbide plane cutting planing mainly used in plane processing and also widely applied in straight groove processing, such as right-angled groove, dovetail groove T-shaped groove, etc.

The technical characteristics of tungsten carbide plane cutter planning:

I. High universality

II. Low efficiency

III. Low machining precision

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Tungsten Nail Sinker Advantages

Details: Category: Tungsten Information; Published on Thursday, 06 November 2014 08:46; Written by Sherry; Hits: 464

Made of tungsten, tungsten nail sinker is designed specifically for the professional soft plastic bait angler to give anglers the extra edge against the competition.

And depending on where the tungsten nail sinker is inserted into the body of the soft plastic lure, the tournament angler is able to effectively tune the rolling action, diving pitch and buoyancy of the soft bait plastic lure to mimic an injured bait fish.

Tungsten nail sinker has the added benefit of being smaller than lead, thus reducing impedance of hook set. Tungsten nail sinker features barbs to help keep the sinker in place and ridges to prevent them from slipping out of the plastic. They can be took up in your tackle box, if consider carrying a few of these weights on hand, just given the limited space.

tungsten-nail-sinker

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