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The impact of tool chip breakage on CNC machine tools in cutting operations

The impact of tool chip breakage on CNC machine tools in cutting operations

Tool chip breakage has a significant impact on normal production and operator safety, in the cutting process, broken chips will splash injury, and easy to research damage to the machine tool; and long strip of chips will be wound in the workpiece or tool, easy to scratch the workpiece, triggering tool breakage, and even affect the safety of workers. CNC machine tools (machining centers) and other automated processing machine tools, due to the number of tools, tool holders and tools are closely linked, the problem of chip breakage becomes more important, as long as one of the tools chip breakage is not reliable, it may damage the automatic cycle of the machine tool, or even damage the normal operation of the entire automatic line, so in the design, selection or sharpening tools, must consider the reliability of the tool chip breakage. . And for CNC machine tools (machining centers), etc., and should meet the following requirements: 1, chips shall not be wound in the tool, workpiece and its adjacent tools, equipment; 2, chips shall not splash to ensure the safety of the operator and observer; 3, when finishing, the chips shall not scratch the machined surface of the workpiece and affect the quality of the machined surface; 4, to ensure the intended durability of the tool, not prematurely wear and make every effort to prevent its breakage; 5、The chips will not interfere with the injection of cutting fluid when they flow out; 6, the chips will not scratch the machine guide or other components, etc. On the basis of meeting the above requirements, different tools have different requirements for chip length. For example, the maximum chip length for rough turning steel is about 100mm; fine turning should be slightly longer. To avoid too fine chips, because it is easy to embed some important parts of the machine tool guide and tool device (such as the reference surface), so that not only need additional protection devices, but also to remove the chips to bring some difficulties. For some tools that are not easy to break chips, such as forming turning tools, grooving turning tools and cutting off turning tools, etc., in CNC machine tools (machining centers) and other automated machine tools, should ensure that its stable roll chips.

03-22

The hardness of a diamond carving knife can be measured like this

The hardness of a diamond carving knife can be measured like this

In the jewelry processing, diamond engraving knife is more often will use to the tool, like our car flower knife, hand batch knife, cnc CNC tools and other tools can be diamond engraving knife. We know that the hardness of diamond is incomparable to other objects in nature, the hardness of the tool in our choice of tool will also be taken into account, next we look at the diamond engraving knife tool hardness measurement method and influence factors. The hardness of the tool is tested with Rockwell hardness tester. Steel props to detect HRC hardness, carbide manufactured tools to detect HRA hardness, PHR series portable Rockwell hardness tester is very suitable for testing tool hardness. The weight of the instrument is 0.7kg, the accuracy is the same as that of the desktop machine, and it can be tried like a micrometer, which is very convenient no matter using and carrying. There are many factors that affect the quality of diamond engraving knives and other cutting tools. Among them, hardness is one of the important factors to determine the good or bad of the tool. The hardness of the tool is determined by the material, different materials determine the different hardness. The materials used to make tools are generally: diamond, tungsten carbide, high-speed steel, alloy tool steel, etc. The hardness of the tool is generally between 56(58)-63HRC. When the tool material hardness is high, wear resistance is also high. However, the higher the hardness of the tool material, the lower its flexural strength and impact toughness. The following is a brief description of the two materials used to make tools. High-speed steel, which is still one of the most widely used tool materials because of its high flexural strength and impact toughness, as well as its good machinability. Coated tools, with high surface hardness, good wear resistance, stable chemical properties, heat and oxidation resistance, small friction factor and low thermal conductivity and other characteristics, coated tools cutting than uncoated tools to improve tool life by more than 3 to 5 times, improve tool cutting speed 20% to 70%, improve machining accuracy 0.5 to 1 level, reduce tool consumption costs 20% to 50%. Therefore, coated tools have become the symbol of modern cutting tools, and the proportion of use in tools has exceeded 50%. At present, various cutting tools used in cutting processing, including turning tools, boring tools, drills, reamers, broaches, taps, thread combs, hobbing heads, milling tools, forming tools, gear hobs and shaper cutters, etc. can be coated to improve their use performance. There are four types of coated tools: coated HSS tools, coated carbide tools, and coated tools on ceramic and superhard material (diamond or cubic boron nitride) inserts. However, the first two types of coated tools are the most used. The coating on ceramic and superhard material inserts is a material with lower hardness than the substrate, in order to improve the fracture toughness of the tool surface (can be increased by more than 10%), which can reduce the chipping and breaking of the tool and expand the range of tool applications. Diamond engraving knife tool as one of the components of super hard material, generally in the production process will be added to the tool with a coating, plus the coating of the tool life longer, the tool is also more wear-resistant. Today gives you the diamond engraving knife and other tools hardness measurement method and tool material. I hope it can help you. Welcome to buy diamond engraving knives from Shenzhen Yuhe.

03-22

Manufacturing methods and future development of diamond tools

Manufacturing methods and future development of diamond tools

Diamond tools are divided into: natural diamond tools and artificial diamond tools according to the material of the tools. I mainly tell you about the manufacturing method and future development of natural diamond tools! First, the manufacturing method of natural diamond knives: Diamond tools are usually diamond fixed in the tool head, the tool head with screws or pressure plate fixed in the turning tool tool bar. Diamond fixed in the tool head methods are: 1, mechanical reinforcement method Will diamond bottom surface and pressurized surface grinding flat, with pressure plate pressurized fixed in the tool head. 2、Powder metallurgy method Put the diamond in the alloy powder, sintered in the vacuum by pressure, make the diamond fixed in the tool head. 3、Bonding and brazing method Use bonding agent to fix diamond Second, the future development of diamond tools Diamond tools with high hardness, wear resistance, small coefficient of friction, good thermal conductivity and other excellent characteristics, is the ideal material for manufacturing cutting non-ferrous metals and non-metallic materials cutting tools, the use of diamond tools for precision ultra-precision parts cutting, began in the late 50s. Later, the development required the processing of aspheric curved reflector, and then the development required the processing of large reflector. Requires very high shape accuracy and very small surface roughness. 　　 At present, the use of natural monocrystalline diamond tools has been quite mature, but because of its low production, expensive, and the emergence of man-made diamond, natural monocrystalline diamond tools in the field of precision machining the increasing trend of use has weakened, several artificial diamond with its good performance to price ratio and gradually mature use of technology, has gradually occupied the relatively low requirements of the precision machining market.

03-22

The failure mode of the tool in the process of use is divided into those

The failure mode of the tool in the process of use is divided into those

The failure modes of tools of different material types are different, the same is the case when the cutting edge is used for two different processes, there will be two completely different categories, recognizing the failure modes will help to make reasonable improvements to the tool so that the tool life can be extended. The failure modes of the tool are those 1. Rear tool face wear Normal wear of any type of material can lead to tool failure. Normal rear face wear is a very popular form of wear because it is the most predictable type of tool failure. Rear face wear is generally very uniform, and it gradually appears as the material being machined wears the cutting edge, similar to a dulling of the cutting edge. 2, crescent pits Crescent pits are common in high-speed machining operations of iron-based or titanium-based alloys, which belong to the tool dissolved into the workpiece chips of heat, diffusion wear and abrasive wear together to cause crescent pits. When machining iron and titanium based alloys, the heat in the workpiece chips dissolves the carbide components and diffuses them into the chips, causing "crescent pits" on the top of the tool. 3、Chip tumor Chip tumors occur when pieces of the workpiece are welded to the cutting edge by hot pressing, which is caused by chemical affinity, high pressure and high temperature in the cutting area. The chip tumor will eventually fall off, sometimes along with the tool fragments, resulting in micro chipping and rapid rear face wear. This failure mechanism is common in viscous materials, low-speed, high-temperature alloys, stainless steel and non-ferrous materials, as well as in threading and drilling. By knowing the failure mode of the tool, the user can check for himself which type it fits and then improve it by the corresponding method, which will help a lot to improve the efficiency and also to extend the service life.

03-22

Strategies for making diamond tool tips sharp

Strategies for making diamond tool tips sharp

With the development of the machinery industry, diamond tools are also being used more and more, different processing methods with different knives, and the characteristics of each knife is not the same, a long time of use will lead to the tool is not sharp enough, so we have to think of some ways to make it sharper, in fact, this method is also very simple, it is from the top of the tool material, improve the hardness, etc. Strategies to improve the sharpness of the tool tip 1, has been shaped to become sharp, you need to use the material has a high hardness, but also need to have a certain toughness, and the quality of the tool, are dependent on the effect of steel in the heat treatment, high-quality steel has a high hardness, brittle small, higher resistance to wear characteristics. 2, in the processing of non-ferrous metal materials, tool life is a very headache, because the life of the tool is determined by many factors, the difficulty of processing the material, the reasonableness of the tool design, tool material selection correctness, processing accuracy and heat treatment process, are important reasons affecting the quality of the tool. Generally speaking in the case of the geometric angle of the blade edge and surface roughness remains unchanged, the higher the hardness of the tool, the better the sharpness of the tool, the more wear-resistant and durable.

03-22

What are the common materials used for diamond tools? Which one is better?

What are the common materials used for diamond tools? Which one is better?

The same are diamond tools, because the material is different, the use effect is different, naturally there will be a certain difference in price. Because the price of natural monocrystalline diamond itself is not low, so there are also many knives are used to replace the artificial diamond, and some other materials. The following is an introduction to the common materials. 　　Monocrystalline diamond 　　If you want to use single crystal diamond as a cutting tool, you should make sure that the quality is more than 0.1G and the diameter is more than 3mm. Generally, these tools are used in some geometric shape precision cutting, or some processing fields with high dimensional precision requirements. And the natural single crystal diamond itself is fine texture, processing effect is better, but the price is expensive, so generally this kind of diamond tools are used in some high-end manufacturing industry. 　　Synthetic diamond 　　In fact, as long as the quality of man-made diamond is guaranteed, it can also ensure the effect of daily processing. Nowadays, the common artificial materials are artificial polycrystalline diamond, and artificial polycrystalline diamond and cemented carbide in line with the material. This kind of tool is easy to use, any orientation sharpening can be, and is not sensitive to accidental damage, the effect of wear resistance is relatively good, is also very suitable for long-term use. And its price is generally only a few tenths of the natural material, the cost performance is still good. 　　CVD diamond 　　Diamond tools are also made of CVD diamond, which has good anti-wear performance and does not contain any bonding agent, so it is practical and safe, and the processing technology is also very demanding. However, because of the complexity of its production, it is generally used for high-speed precision machining, and its hardness and service life are better than synthetic materials, and the cost performance is relatively good.

03-22

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