Wiper Turning Blade: Features And Wear Improvement Measures

The wiper turning blade is a high-efficiency blade used for semi finishing and finishing turning.

Due to the scientific change of the fillet tip radius (its tip radius consists of about 3 ~ 9 different radii), this will increase the contact length and have a positive impact on the feed rate or surface quality.

3. Wiper turning blade

1. Overview of wiper turning blade

With the wiper blade, the feed rate can be doubled while the surface quality remains unchanged. The wiper blade is shown in Fig. 3-9.

wiper polishing blade

Fig. 3-9 wiper polishing blade

2. Comparison of machining effect between wiper turning blade and traditional ISO turning blade

Under the same cutting parameters, the comparison of the surface quality obtained by the wiper turning blade and the traditional ISO turning blade is shown in Fig. 3-10.

processing effect comparison between wiper turning blade and traditional ISO turning blade

Fig. 3-10 processing effect comparison between wiper turning blade and traditional ISO turning blade

3. General principles for obtaining high surface quality by using wiper polishing blade

The general principles for obtaining high surface quality with the wiper polishing blade are as follows:

(1) Surface quality can usually be improved by using higher cutting speeds.

(2) The blade groove shape (negative rake angle and positive rake angle) affects the surface quality.

(3) The choice of blade grade has little effect on the surface quality.

(4) If the vibration trend occurs, select the turning blade with smaller tip radius to improve the machining condition.

4. Turning tool wear and improvement measures

During the cutting process, the cutting edge of the turning blade is gradually worn.

See table 3-20 for various wear causes and improvement measures.

Table 3-20 common blade wear and improvement measures

Problem

Reason

Improvement measures

Excessive flank wear and groove wear

1. the surface quality becomes poor due to the rapid wear of the rear cutter face 2 Groove wear can cause surface quality degradation and cutting edge fracture

Too high cutting speed or poor tool wear resistance

1. reduce cutting speed 2 Choose a more durable brand

oxidation

1. select A1203 coating brand;

2.For work hardening materials, select smaller main deflection angle or more wear-resistant materials

abrasion

Reduce cutting speed (use ceramic inserts to improve cutting parameters when machining heat-resistant alloy materials)

crater wear

Excessive crater wear will weaken the cutting edge, and the damage of the trailing edge of the cutting edge will reduce the surface quality

Because the cutting temperature on the rake face is too high, diffusion wear is caused

1. Select Al2O3 coating brand;

2.Select the positive front corner blade groove; 

3 First, reduce the cutting speed to reduce the temperature, and then reduce the feed rate.

 

 

Plastic deformation

The cutting edge collapses or the flank is sunken, resulting in poor chip control and poor surface quality. Excessive wear of the flank will lead to edge collapse

Cutting temperature too high and pressure too high

1. Select a firm brand with better resistance to plastic deformation;

2. when the cutting edge collapses, reduce the feed rate;

3 when the flank is concave, reduce the cutting speed.

 

Cumulus tumor

The chip buildup will reduce the surface quality, and the cutting edge will be damaged when the chip buildup falls off

The workpiece material is bonded to the blade because: the cutting speed is low; the negative rake angle cuts the groove shape

1. Improve the cutting speed;

2. Select the positive front corner groove.

 

Chip Impact

The uncut part of the cutting edge is damaged due to cutting hammering, and the upper cutting surface and the blade support surface of the blade may be damaged

Chip back to cutting edge

Change the feed rate and select the alternative blade groove.

Avalanche

Small chipping of cutting edge leads to poor surface quality and excessive wear of flank

1. the brand is too brittle 2 The blade groove is too weak 3 Cumulus tumor

1. Choose a brand with better toughness;

2. Choose a groove with higher strength (for ceramic blades, choose a larger chamfer);

3 Increase the cutting speed or select the positive rake groove shape to reduce the feed at the beginning of cutting.

Thermal cracking

A fine crack perpendicular to the cutting edge will cause the blade to collapse and the surface quality to decline

The thermal crack caused by temperature change is caused by intermittent cutting and change of cutting fluid supply

Choose a ductile grade that is more resistant to cracking

Tool breakage

Blade breakage will not only damage the blade, but also damage the tool pad and workpiece

1. the brand is too brittle 2 Excessive load on blade 3 The blade groove is too weak 4 Blade size too small

1. Choose a brand with better toughness;

2.Decrease feed rate and / or back feed rate

Partial cracking (ceramic blade)

Partial cracking leads to poor surface quality and reduced tool life

Excessive tool pressure

Reduce the feed rate, select the brand with better toughness, and select the blade with smaller chamfer.

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