Cemented Carbide Tool Cutting Edge Defect and Honing

Cemented carbide tool cutting edge defect and honing (The outer periphery cutting of vehicle parts)

Results: cemented carbide cutting edge defect occurs, the life will be shortened. Cemented carbide tool cutting edge honing can increase tool life

Summary: In general, cutting steel when necessary to carry out the cutting edge honing of cemented carbide tool, cemented carbide cutting edge honing can prevent the fragmentation of the cutting edge and glue attachments cutting edge processing, or due to the cutting the vibration generated by the chipping, and the gap. Honed width of the cemented carbide cutting edge is approximately 0.5-0.8 times the feed amount.

Cemented Carbide Tool Nose Radius

Cemented carbide nose radius and machining surface to improve accuracy (finishing inside diameter of mechanical parts)

Results: R0.4 corner radius becomes R1.2 nose radius knife life will be very different. The nose of the tool worn smooth, further increase the angle of the rear of the nose portion, the above phenomenon disappears.

Cemented Carbide Tool Life

Relationship between posterior horn size and cemented carbide tool life (Electrical parts of face machining)

Cemented carbide tool life means a new cemented carbide cutting tools from the beginning put into use until the total cutting time up to the end-of-life, which includes multiple regrinding (number of regrinding said n) time, so cemented carbide tool life equal to the tool the durability multiplied by the (n +1).

Results: previous practice of cutting the anterior horn of the standards tools get bigger, a little while you will find the cutting edge becomes dull, the surface roughness of the machined surface. According to the size of the posterior horn and cemented carbide tool life relationship, if not only the anterior horn made bigger, increase the posterior horn, the problem is solved.

Cemented Carbide Tool Cutting Often Occurred Instance

Cemented carbide tool cutting often occurred instance

1.Cemented Carbide Turning Tools Chipbreaker
2.Cemented Carbide Tool Life
3.Cemented Carbide Tool Nose Radius
4.Cutting Edge Defect and Honing
5.Cutting Fluid Effect
6.Machining Deflection Solutions
7.Cemented Carbide Milling Teeth Number Selecion
8.Cemented Carbide End Mill Honing Effect
9.Face Milling Cutter Applications
10.Side Milling Cutting Edge Spirals
11.Reamers Processing Bending Solutions
12.Reamers Allowance & Surface Roughness
13.Reamers Accuracy & Surface Roughness
14.Reamers Oil Supply & Surface Roughness
15.Cemented Carbide Twist Drill Grinding
16.Cemented Carbide Twist Drills Deep Hole Machining
17.Hard Cutting Materials Special Drill
18.Barrel Drill Use Instance

Cemented Carbide Cutting Tools Note

Cemented carbide cutting tools note:

• Cemented carbide cutting tool material is hard and brittle characteristics, it is sure to use a diamond grinding wheel finishing.

• Cemented carbide cutting tool materials having the hard and brittle characteristics, it will produce fracture when subjected to shock or the clamping force is too.

• Cemented carbide thermal expansion coefficient is small, it is used as a thermal sleeve or cold kits product, if the use temperature and the design value of a significant difference (high or low) will produce cracks.

• Note to be placed in a dry place, the storage of carbide cutting tools will make it corrosion due to cutting or other liquid, reduce tool strength.

• Hardness of brazing alloy blade brazing temperature is too high or too wet, will produce the blade off or cracks.

• Cemented carbide tool sharpening, you must carefully check whether the cracks.

• If electricity machining carbide cutting tools, tool surface should be checked for residual crack, otherwise it will affect the tool strength by fine grinding necessary to eliminate the tool surface cracks.

Cemented Carbide Tool Wear Characteristics and Composition

Cemented carbide tool wear includes abrasion wear, crater, chipping,  thermal cracking, gap, abnormal debris, etc.

The mechanism of various cemented carbide tool wear occurred associated with the characteristics of the cemented carbide tool wear as shown in  the table below.

Cemented Carbide Tool Wear Relationship

Cemented carbide tool wear includes abrasions wear, crater, chipping, thermal cracking, gap, abnormal debris, etc. Various cutting edge wear occurs only one time is considerably less, and almost always is interrelated and occur simultaneously,the tool wear relationships together, as shown below.

Cemented Carbide Tool Wear - Peeled Into Pieces

Cemented carbide tool wear includes abrasions wear, crater, chipping, thermal cracking, notch, abnormal debris, etc.

Cemented carbide tool wear - peeled into pieces:
the elastic deformation due to the vibration of the workpiece material in the cutting generates, in front peeling, then choose a high cobalt content, good toughness material.

Cemented Carbide Tool Wear - BUE Peel

Cemented carbide tool wear includes abrasions wear, crater, chipping, thermal cracking, notch, abnormal debris, etc.

Cemented carbide tool wear - BUE peel:
In many occasions, in the front (or back) to remove the BUE, phenomenon occurs when the cutting edge is peeled. In this case you want to select a large rake angle, or increase the cutting speed.

Cemented Carbide Tool Wear - Exception Debris

Cemented carbide tool wear includes abrasions wear, crater, chipping, thermal cracking, notch, abnormal debris, etc.

Cemented carbide tool wear - exception debris:
A serious gap in the cutting edge due to heat, reduce the cutting speed, or the use of high-temperature materials.

Cemented Carbide Tool Wear - Notch

Cemented carbide tool wear includes abrasions wear, crater, chipping, thermal cracking, notch, abnormal debris, etc.

Cemented carbide tool wear - notch:
a relatively large gap along the blade, impact resistance, in order to strengthen the cutting edge of the anterior horn corrected to the negative direction. If it is useless to change the blade shape, it is better to choose high toughness materials.

Cemented Carbide Tool Wear - Thermal Cracking

Cemented carbide tool wear includes abrasions wear, crater, chipping, thermal cracking, notch, abnormal debris, etc.

Cemented carbide tool wear - Thermal cracking:
current face or the back of serious cracks, it is recommended to use M Series material that thermal conduction properties, not easy to produce thermal fatigue.

Cemented Carbide Tool Wear - Chipping

Cemented carbide tool wear includes abrasions wear, crater, chipping, thermal cracking, notch, abnormal debris, etc.

Cemented carbide tool wear - chipping:
When the tiny nibs after falling, and then carefully grinding tool tip should be honed cutting edge, can significantly reduce the debris. For those who need to use a large rake angle during processing of the material (for example, soft steel), refer to the following example to select the tool material.

Cemented Carbide Tool Wear - Crater

Cemented carbide tool wear includes abrasions wear, crater, chipping, thermal cracking, notch, abnormal debris, etc.

Cemented carbide tool wear - crater:
face quite powerful concave wear occurs, consideration should be given high temperature diffusion and intensity, recommend the use of titanium carbide, tantalum carbide content material. Specific, such as the following example shows, the direction of the arrow to the selected material.

Cemented Carbide Tool Wear Introduction - Part1

Cemented carbide tool wear includes abrasions wear, crater, chipping, thermal cracking, notch, abnormal debris, etc.

(一) Cemented carbide tool wear - abrasions wear: As shown, when behind quite severe wear occurs strip cutter, fine particle materials, and to enhance its hardness and strength after high temperature quenching. Recommended material contains a trace of tantalum carbide. Specific, such as the following example shows, the direction of the arrow to the selected material.

Cemented Carbide Reamers Use

Assembly precision: the use of cemented carbide reamers pays attention to be loaded into the machine, the front end of the feed section of cemented carbide reamers jitter control below 0.02mm. In cutting, to always maintain this accuracy can be used to guide sleeve.

● the feed part of the cutting edge gap check: even if the jitter of the reamer can be restricted within a desired range, but in fact often the cutting edge chipping, notched, or lack of a good surface roughness and the holes accuracy. Therefore, prior to use, not only to check the cemented carbide reamer jitter, also check the cutting edge itself has no chipping, and the gap.

● oiling method: processing oil lubrication can not only make the polishing effect is more significant, can help chip smoothly discharged, so that the accuracy and processing accuracy of the surface of the hole to further improve. Attention to the selection of the direction of a good oiling to oil, especially in some dedicated horizontal machine processing, to make the oil direct injection to the cutting edge of the reamer, then consider the hinge as shown with hole the knife is a good choice.

Cemented Carbide Reamers Selection

Usually the problem is to be noted while reamers are operating including allowance, the depth (diameter), surface roughness, and the hole expansion, selection criteria, such as cemented carbide reamer table:

Particular attention to the processing method for oil, that is, it must seriously consider how to cleverly chip removing. For example, compared to the starting horizontal machining using the vertical drilling process, chips and oil will Next outflow, thus reducing the clogging of chips and film discontinuity, and will improve the quality of the processed surface. Especially in the deep hole machining with hole cemented carbide reamers, must pay attention to.

Cemented Carbide Drill Use

●Chip processing
Processing cemented carbide drill, do not want the chips together into a strip of discharge. Especially in processing toughness relatively strong material, the chips long chip clogging, and thereby damage the tool. In this case, generally stop feeding, chip removal and then continue processing in this way is called phase-fed.
In order to cut off the chip, the method can be used to install a metal shim in the flute cemented carbide drill section.

● Drill diameter and depth of the openings

The standard depth of the opening is maximum 5 times the diameter of the drill shank brazed cemented carbide blade type, maximum depth can be up to 7-8 times the drill diameter, and of course in that case the treatment of the chips is very important .

● The use of the guide sleeve

when the work surface is not flat, in order to prevent the nose jitter and cause damage to the cutting edge, as far as possible using the guide sleeve, so that the cemented carbide drill work material can be cut in a straight line.

Cemented Carbide Inserts Manufacturing Process

Cemented carbide inserts manufacturing process unlike casting material or steel as melted by the ore is injected into the mold after forming, or by forging, but will reach only above 3000 ℃ molten carbide powder (tungsten carbide powder, titanium carbide powder, tantalum carbide powder) is heated to more than a thousand degrees Celsius it sintered. Cobalt powder as a binding agent for the combination of such carbides more firmly. Affinity interaction between carbide and cobalt powder under the action of high temperature, high pressure, will be enhanced, thus gradually forming, this phenomenon is called sintering. Because of the use of a powder, so this method is called the powder metallurgy method.