Tungsten Carbide Roller Cone Bits of Spherical Teeth

Extremely hard rock drilling tungsten carbide roller cone bits using Q-shaped spherical teeth, because Q-shaped dense spherical gear tooth cloth, while Q-shaped spherical teeth protruding lower height, wheel-shaped spherical tip of the tooth tooth for Q and other non-dense approximation bus arrangement, and spherical-shaped teeth teeth Q hard rock drill more, such as the pitch of each ring are uniform, outside the ring is slightly lower, the formation stage. Wheel back and claw back teeth are inlaid P-shaped flat. WOB per centimeter diameter of the drill bit 892 kg to 1339 kg range, speed is 50 to 80 revolutions per minute, every minute. Damage in the form of carbide roller cone bits include bearing damage, cone damage, dental tooth damage, sharp dorsal tooth wear.

Tungsten Carbide Roller Cone Drill Bit Wear Cause Analysis

Tungsten carbide roller cone drill bit wear is caused by the cone balling, mainly due to carbide roller cone rock bit drilling very soft water, drilling pressure is too high; insufficient air flow slag, slag rock can not be successfully discharged; in the high density or high-grade ore drilling, but also easy to produce bad slagging this phenomenon. Carbide teeth broken off the main causes is due to rock too hard; improper carbide drill selection; drilling rate is too high. Causes the outer tooth wear is mainly due to two points, one rock hard; second point is that long-term operation, the drilling in iron ore.

General Types of Tungsten Carbide Roller Cone Drill

Tungsten carbide roller cone drill bit has been widely used in the wheel wells, open-pit iron and non-ferrous metal mines, coal mines and other types of rock drilling, with the gradual increase in cone bit varieties, water and electricity sectors quarrying, clear base, hydrogeological drilling, coring, Chuanzao railroad traffic tunnel, mine shaft sinking and so on in the use of carbide roller cone bit. In order to improve the wear resistance of carbide roller cone bits and life, from oil mining drill to drill in the past are surfacing drill teeth with cast tungsten carbide working surface, the current cast tungsten carbide teeth surfacing drill work surface technology is still in use in soft formations drilling, and has been replaced by carbide teeth in hard formations.

Tungsten Carbide Roller Cone Drill Works

Tungsten carbide roller cone drill supported by ball bearing, in some cases, for the radial and axial loads. Radial load, mainly by the journal, bear large bearings and bushings. The ball into the hole from the peg by peg has thrust face support care, bushings at both ends, end thrust block embedded within the cone, flat thrust bearings to withstand axial thrust. In order to reduce tooth wear palm palm between the tip and the hole wall, the tip of the tooth palm studded cast tungsten carbide flat teeth or welding. Drill lumen design romantic (or fluid) distribution system, air pressure through the drill rig, enter the cavity, where the wind blows most of the pressure from the side of the tooth claw 3 interchangeable nozzles to the bottom of the hole, the rock slag the annular space between the drill hole wall and discharged to the surface.

Tungsten Carbide Roller Cone Bits Features

Tungsten carbide roller cone bits for use at home and abroad, mostly three-cone drill. This drill is characterized by: axial compression and impact a larger range and uniform load distribution, and can make full use of available space, into stable. The size and shape of the cone bit with carbide teeth must be applied to properties of rocks, requiring good wear resistance, high strength, not broken, and broken. Carbide tooth roller cone bits used are: spherical gear, bevel gear ball, wedge-shaped teeth, tooth edge wedge teeth and topped with Zhao Jian, such as for the back wheel.

Tungsten Carbide Siping Hollow Drill Introduction

Tungsten carbide siping hollow drill (TCTannular cutter), also known as coring drill, hollow drill, hollow drill coring drill, metal hole saw, hole saw, drill reaming, reaming drill, magnetic drill bit, magnetic drill, magnetic drill, etc., hollow drill works: Segment 3 blade using a combination of two or more groups, three combinations of several outer edge of the blade, the blade, the blade components. Each blade in the cutting process, the burden of the workload only about 1/3, plus the inside of each blade are also cutting knife. So, you can make the chip very smooth. In addition, as part of the various characteristics of the cutting edge work burden, respectively, making the holes drilled extremely difficult to produce chipping.

Tungsten Carbide Deep Hole Drills Introduction

Production of tungsten carbide deep hole drill material is the use of ultra fine grain solid carbide, carbide deep hole drill diameter which is between 3-16 standard products millimeters length to diameter ratio of the maximum possible up to 30 times the diameter. In the course of processing needed to guide the use of carbide drill to drill pilot hole drilling process does not require retraction. The efficiency of carbide deep hole drill gun drill usually between 5-10 times, in order to solve the problem carbide deep hole drill platoon cut in deep processing of carbide deep hole drill bit to make a some improvement. For example, the use of tank platoon cut mirror-polished alloy that can reduce the coefficient of friction in the deep deep hole drill platoon cut processing time to improve cutting performance exhaust.

Use Tungsten Carbide Twist Drill

Tungsten carbide twist drill with helical and bevel groove for drilling burr or steel, pipes and sides reaming, work process-sided deburring and chamfering (material thickness of 1.5mm or less). Construction steel, chrome-nickel alloys, non-ferrous material thickness up to the drill 6mm, drill bit diameter and the number of revolutions has been marked with the laser class at recess. Coating thickness up to 4μm, high temperature up to 900 ℃ surface hardness up to 3800HV. Suitable for drilling in high-strength steel, hard cast iron, hard manganese, silicon, aluminum, thermoset plastics, glass and carbon fiber plastics, resins and packaging.

Tungsten Carbide Hollow Drill Selection Guide

Tungsten carbide hollow drill specifications generally composed of three parts: the shank types, drilling diameter (the diameter of the hole to be processed), and effective cutting depth; example: 24-hole plate thickness if you want to drill diameter not more than 35mm, you use the Texas Bor DK35 magnetic drill, then you can choose a right angle drill shank or universal shank Φ24 * 35 on it; If you want the processing of metallic materials thicker than 35mm and not more than 50 mm, then you select the right angle handle and universal shank Φ24 * 50's on it; If the material to be machined 75mm or less than 50mm, you can choose a right angle drill hollow shank or universal shank 24 * 75; you want to process 75mm more metallic materials, then it can choose to 24mm * 100mm, 24 * 120mm, 24 * 200mm, such as rectangular hollow shank or universal shank drill another hole diameter to be machined, just transform the diameter of the hollow drill down on it!

Optional Tungsten Carbide Drill Considerations - Chip and Coolant

BTA is drilling the problem can not be ignored. In fact, most drilling encountered problem is poor chip removal (especially when machining low carbon steel workpiece), and regardless of the use of tungsten carbide drills were unable to avoid this problem. External processing plant are often used way of auxiliary coolant injection chip, but this method is processed only in the depth of the hole is less than the diameter of the cutting parameters and reducing conditions effective. In addition, the diameter of the drill bit must be selected to match the proper coolant type, flow and pressure.

Optional Tungsten Carbide Drill Considerations - Processing Cost Per Hole

Each hole machining productivity or cost is the most important factor in drilling of. In order to improve productivity, manufacturers are working on the drill bit can be integrated multiple step method for processing the operation, and to develop high feed, high speed processing of the drilling tool. The latest development of replaceable tungsten carbide drill crown having excellent machining economy. After the drill bit wear, users do not have to replace the entire drill body, you can simply replace carbide crown, which is equivalent to the purchase price of welded or solid carbide drill regrinding a fee. Carbide crown replacement is easy and highly reproducible precision machine shop drill body can be used with a plurality of teeth crowns, to the processing of different pore sizes of holes. This modular drilling system can reduce 12 ~ 20mm diameter drill cataloging costs, but can also save a backup tool costs when welding or solid carbide drills need to be reground.

Optional Tungsten Carbide Drill Considerations - Processing Stability

In addition to considering drilling accuracy requirements, the need to consider the stability of the machine tool when selecting tungsten carbide drill. Machine stability is essential for the safety and drilling precision drill life, and therefore need to carefully examine the machine spindle, fixture and accessories working condition. Also, consider the stability of the drill itself. For example, the overall rigidity of the best tungsten carbide drill, so you can achieve high precision. The poor structural stability carbide indexable insert drills, prone to deflection. This drill is installed on two indexable inserts, wherein the inserts for the central portion of the machined hole in the outer cutter from the inner blade to the outer edge of the processing portion at the outer diameter. Since only the initial stage in the process of cutting into the inner blades, drill bits in an unstable state, easily causes deflection of the drill body, the drill bit and the longer, the greater the amount of deflection. Therefore, when using longer than 4D carbide indexable insert drills and drilling, drilling should begin at an appropriate stage to reduce the amount of feed, cutting into the stable phase after the feed rate to normal levels.

Optional Tungsten Carbide Drill Considerations - Precision

Tungsten carbide drill bit selection, you first need to consider the size of the drilling accuracy. Generally, the smaller the aperture is processed, its tolerance is smaller. Accordingly, manufacturers typically drill hole to be machined according to the nominal diameter of the drill bit segments. In the above four types of tungsten carbide drills in solid carbide drill precision highest (φ10mm solid carbide drill tolerance range of 0 ~ 0.03mm), so it is the best choice for high-precision machining holes; welded carbide replaceable tungsten carbide drill or drill crown tolerance range is 0 ~ 0.07mm, more suitable for the general accuracy of the hole.

How to Improve The Utilization of Tungsten Carbide Drill

Improve the utilization rate of the alloy drill to avoid tungsten carbide drill drill easily break during use, thus master the correct use of carbide alloy drill is necessary because the methods used to reduce improper tungsten carbide drill breakage. Proper maintenance and safe use of carbide drills must be done on carbide drill drill drill alloy plastic shell cracked to properly protected against collision, carbide alloy drill drill with gasoline or other flammable Do solvents mutual contacts. And keep tungsten carbide drill drill ventilation flow, to avoid iron and other debris to enter in order to avoid damage to the carbide alloy drill drill. Keeping a sharp tungsten carbide drill bit, drilling does not advocate when too much force to prevent drill overload.

Tricone carbide drill Precautions

1.Must be in the bottom tipped drill bit clean, mine can only go down when no litter use. Wells must be salvaged if litter clean. In drilling using the drill will squeeze into small pieces the iron wall approach is not desirable. Mine have hit a hard object hit, alloy teeth very easily broken, and broken tooth alloy cone will damage other teeth and the matrix, the bit early damage.
2.Reduce or downhole wellbore, when needed Nagai segment reaming, you can not use tipped drill bit. Because reaming cone outer rows of teeth so that larger reaction force by the wall, causing the back of the cone and the cone palm sharp tooth wear, the drill necking, early seal failure, premature bearing damage or even rupture cone pan into the fire accident .
3.Local surface equipment damage, lack of power, pipeline washout, weight indicator is not working as well as the drilling fluid performance does not meet the requirements or purification device while achieving the desired effects should not be the servant tipped drill bit, in order to avoid the occurrence of underground economic losses caused by the accident.
4.The new tricone tungsten carbide drill oil soaked and can not forcibly activities cone.

Tricone Tungsten Carbide Drill Introduction

Under the tricone tungsten carbide drill to 3 m from the bottom (the bottom number of visible grit may be), to fully circulating drilling fluid, when about one meter from the bottom into the bottom under rotation. Gently press the bottom of the well to drill when new to LP for some time. Because the bottom of the old with the new drill drill formation often do not match the shape of the bottom surface, a few new drill teeth touch the bottom of the first, the formation of stress concentration, and a big shock loads broken teeth, broken teeth in the mine will damage other teeth , resulting in damage to the drill bit early. Drill at the same time trimming the bottom, bearing also had run together, make a good seal. Gently press LP primarily a running-time on the well used by the drill wear decision, generally not less than 30 minutes.