Some problems often occur when the tungsten carbide screw-tap’s is tapping, involving the high surface roughness of the inner thread. There are several factors and solutions in the followings:

1.Tungsten carbide screw-tap’s selection is incorrect; Choosing the right conditions to be processed by the tungsten carbide screw-tap.

2.Cutting speed is too high; Reduce cutting speed.

3.Cutting Cone length is not enough; Increase the length of the cutting cone.

4.Chip poor; Choosing the right conditions to be processed by the tungsten carbide screw-tap.

5.Bottom diameter is too small;    Select the bottom hole diameter according to the corresponding standards.

6.Cold welding; Improve the cooling and lubrication conditions.

 

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It often occurs some problems when the tungsten carbide screw-tap’s is tapping, involving the thread is too large. There are several factors in the followings:

1.Tungsten carbide screw-tap’s selection is incorrect;

2.Eccentric Bottom;

3.Nonuniform axial feed;

4.Tungsten carbide screw-tap’s tolerance wrong choice;

5. Cutting speed is too high.

There are the solutions in the followings:
           
1.Choosing the right conditions to be processed by the tap

2.Tapping float switch / improvement Bottom

3.Tapping float switch / improvement tools

4.Reducing the number of tungsten carbide screw-tap’s chip flutes, flute expand capacity chip space;

5.Reduce cutting speed.

 

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Tungsten carbide screw-tap’ successful application depends on the stiffness of the tool holder and control precision feed. For most of the processing methods, these processing conditions for granted. But for tungsten carbide screw-tap’s tapping, these conditions are only just become a reality.

Machine control technology continues to progress, has been able to achieve with the rotation of the spindle synchronization control the feed, which can no longer use the soft tapping head. In addition, the use of thermal loading and hydraulic tool clamping chuck can increase the rigidity of the tool, but also significantly reduce run-out than when using flexible tapping head. Concentric rotation of the tool holder within 3μm. Despite the large clamping force precision telescopic precision (TGHP) chuck performance and less on heat-mounted hydraulic tool chuck, but when applied to tungsten carbide screw-tap’s tapping is also very effective.

 

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The dimensional accuracy of the tungsten carbide screw-tap’s internal thread determines the thread’s assembly and fitting accuracy. When the tungsten carbide internal thread, drill or tap normally driven by an asynchronous machine with a flexible tapping head, a flexible drive tungsten carbide tap tapping head may rotate at a rate close to the required thread feed lead. When these old machines is difficult to precisely coordinate tapping into rotary motion to give, and this synergy is a necessary condition tapped holes.

Therefore, you must use the tapping head is flexible control error range. When tapping, tapping the head of flexible wire tapping will produce radial run-out, limiting the improvement of the accuracy of the Tungsten Carbide Screw-tap’s thread. These factors lead to lower rigidity, and the processing load tap uneven.

 

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Tungsten carbide screw-tap compared with most turning, milling and drilling tools are different, tungsten carbide taps’ cutting edge are relatively weak, and the overall strength is lower. Even in the workpiece material is relatively easy to cut when machining, tungsten carbide screw-tap’s cutting edge is also prone to chipping, leading to tool failure. When the low carbon steel tapping, continuous long chips may clog the chip flute taps, thus limiting the number of Tungsten Carbide Screw-tap applied even more easily than the workpiece material tapping steel (such as aluminum and iron).

Steel and other iron-group material are the most common needs of processing and assembly with the screw holes in the material, therefore, tool manufacturers are sparing no effort to develop cutting edge to prevent chipping and breakage of taps. Given carbide and high speed steel can be compared with the innate superiority, and therefore Tungsten Carbide Screw-tap has become a developmental point.

 

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There are several features of Tungsten Carbide Screw-tap, they are the followings:

Material: Consider the wear resistance and impact resistance under the premise of using ultra-fine particles of tungsten carbide. 

Shape: To improve rigidity, no-neck strengthening tap handle type.

Channel: to improve the wear resistance and good chips, using this matches the number of grooves and groove shapes.

Cutting angle: To increase rigidity and prevent chipping, using a special rake angle.

Accuracy: Given the contraction in the thread, using a modest increase size.

Cut length: consideration of the stability and longevity of the cut portion of the length defined in the five teeth.

Tip diameter: To ensure that the actual length of the cut, using a large tip diameter taps.

 

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Tungsten carbide screw-tap’s tapping process exist chip processing problems, due to the tungsten carbide material itself for it features high carbide hardness, brittleness. Tungsten carbide screw-tap’ unique features and characteristics of the manufacturing process design parameters, the use of advanced coating technology, the basic form of the performance characteristics of Tungsten Carbide Screw-tap.

Tungsten Carbide Screw-tap feature to strengthen and improve the wear resistance of the tip, the use of special grooves and cutting angle, while increasing the number of grooves to reduce the amount of each cutting tooth; to improve the wear resistance and anti-stick properties knife , using the TiAlN surface coating with excellent and stable chemical heat and chemical resistance.

 

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Due to tungsten carbide twist drill’s shape, the cutting edge features of each point shows the helix angle is changed, the tungsten carbide twist drill’s helix angle directly affects the anterior horn of the main cutting edge.

Tungsten carbide twist drill’s helix angle is larger, the more sharp edge, cutting more light, otherwise it will cause serious hardening phenomenon making the blade quickly wear. According to the relevant tool design data, taking tungsten carbide twist drill’s helix angle of 30 ° to meet the requirements, while allowing for mass production.

 

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Tungsten carbide twist drill’s rake is depended on other geometric parameters.

When high-speed cutting tools, impact deformation and cutting tungsten carbide twist drill’s rake angle of the cutting force is small, while a smaller front corner tip can be enhanced intensity. After determining the current angle, the greater the tungsten carbide twist drill’s rake angle, the more sharp edge, but will correspondingly reduce the impact of the tungsten carbide twist drill’s wedge angle of the tool strength and heat dissipation area. To this end, the smaller the angle of the tungsten carbide twist drill’s drill is selected, taken as 8 °.

 

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Tungsten carbide twist drill’s main geometric parameters include relevant handling drill corner selection, choose angle and the angle of the cutting edge before the drill, impact drill helix angle of the drill-life analysis and cutting edge.

The width of the tungsten carbide twist drill’s drill cuttings and drill apex decision anterior horn size. When the bit diameter and a certain amount of feed when the angle is increased, the iron is narrowed, the cutting edge of the unit load is reduced.Vertex has a great influence on the rake angle, a corresponding increase in the apex angle cutting conditions conducive to improving terrible at. Angle on the direction of chip flow. According to the relevant tool design data, combined with the hardness of the processed products is not high, but the viscous characteristics, select the tungsten carbide twist drill’s drill apex angle of 140 °.

 

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