What are the factors that affect the durability of carbide drill bits?

There are 6 factors that affect the durability of cemented carbide drill bits during drilling operations.

 

The first influencing factor is whether the clamping method of the hollow carbide drill bit is correct. The second influencing factor is whether the centre degree of the drive shaft of the drilling machine is good and concentric. The third influencing factor is whether it is Whether the interval between the big gear and the pinion of the drilling rig is small, the fourth factor is the reliability of the guide rail of the magnetic drill, whether it is fastened, and the fifth factor that affects the durability is whether the hollow carbide drill is cooled during operation, insufficient cooling. The sixth factor that affects its durability is whether the force used by the operator is appropriate.

carbide drill bits

 

1. Rig rail factors

 

The reliability of the guide rail, whether it is fastened or not, the effect is that the tighter the guide rail, the smaller the shaking when drilling, the smaller the outward tension of the carbide drill bit, and the longer the life of the hollow carbide drill bit. Tight and loose large carbide drills have greater outward tension, and the life of the carbide drill is shorter.

 

2. Drill drive shaft

 

Whether the centrality of the transmission shaft is good or not, and whether it is concentric, the effect is that the better the centrality, the better the concentricity of the cemented carbide drill, and the smaller the outward tension of the cemented carbide drill, the longer the life of the hollow carbide drill. The longer it is, the poorer the centrality, the poorer the concentricity of the cemented carbide drill, the greater the outward tension, and the shorter the life of the cemented carbide drill

 

3. Drill gear and pinion

 

The smaller the gap between the large gear and the pinion, the smaller the backward resistance of the hollow carbide drill bit when the drilling rig is working, and the smaller the probability of wear on the cutting edge of the hollow carbide drill bit, so the life of the carbide drill bit is longer. On the contrary, if the interval is large, the rear resistance will be large, and the life of the carbide drill will be shorter.

 

4. Hollow carbide drill clamping method

 

The clamping method is correct and firm. The hard alloy drill bit will be more durable. Wrong operation when the carbide drill bit is clamped, the clamping is not in place or the clamping is not tight, which may cause the hollow carbide drill bit to loosen. After loosening, the natural use durability is even shorter.

 

5. Hollow carbide drill bit cooling

 

Sufficient cooling of the cemented carbide drill during operation can make the life of the drill longer. If no coolant is added or insufficient coolant is added, the durability of the cemented carbide drill will be shortened.

 

6. Force during operation

 

Whether the operator’s operating force is appropriate has a great impact on the durability of the drill bit. Appropriate operating force can reduce the chance of cracking the cutting edge of the carbide drill bit and prolong the life of the coring carbide drill bit. Anyway, the operator’s force is not appropriate Then the life of the cemented carbide drill bit will be shortened a lot.

Causes of wear of cemented carbide drill bits

 

The thinner the carbide drill, the more sensitive it is to vibration and tensile stress during use. If the radial or axial runout is large, it is easy to cause damage. Therefore, the milling machine should be in a running state, that is, the machine tool has high precision, good rigidity of the cutter bar, stable transmission, constant feed per tooth, and sufficient cooling.

Carbide drills are widely used due to their tight shape tolerances. Since the blade cannot be replaced directly, most of the drill bits are scrapped after the cutting edge collapses, which increases the processing cost.

 

1. Processing material characteristics

 

When the cemented carbide drill bit is working, due to the poor thermal conductivity of the titanium alloy, the chip is easy to adhere to the drill bit or forms an edge, and a high-temperature zone is formed on the front and rear tool surfaces near the drill bit, resulting in loss of red hardness of the drill bit and increased wear. During high-temperature continuous cutting, because subsequent processing affects the adhesive and weld, some tool material will be taken away during the forced removal process, resulting in drill bit defects and damage. In addition, when the temperature of the drill bit reaches above 600°C, a hardened hard layer will be formed on the surface of the part, which will have a strong abrasive effect on the drill bit. The surface of the cemented carbide drill has a large rebound near the side, the contact area between the processed surface and the side is large, and the wear is serious.

 

2. Normal wear and tear

 

In normal production and processing, when the continuous wear allowance of titanium alloy parts reaches 15mm-20mm, serious blade wear will occur. The continuous grinding efficiency is low, and the surface finish of the processed parts is poor, which cannot meet the production and quality requirements.

 

3. Improper operation

 

If there are improper clamping, improper drilling depth, excessive spindle speed, and insufficient cooling during the production process of the cemented carbide drill bit, the drill bit will collapse, be damaged, or break. Such defective drills cannot perform effective milling. In addition, in the grinding process, surface defects such as concave processing surfaces will be caused by “gnawing”, which will not only affect the processing quality of the drill bit surface but also lead to the scrapping of processed parts in severe cases.

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