The hardness of the tool was measured using a Rockwell hardness tester. Steel props detect HRC hardness, carbide-made tools detect HRA hardness, and PHR series portable Rockwell hardness testers are ideal for detecting tool hardness. The instrument weighs 0.7kg and has the same precision as the desktop. It can be used like a micrometer, making it easy to use and carry.
There are many factors that affect tool quality. Among them, hardness is one of the important factors that determine the quality of the tool. The hardness of the tool is determined by the material, and different materials determine the different hardness. The materials used to make the tool are generally: tungsten carbide, high speed steel, alloy tool steel, and the like. The hardness of the tool is generally between 56 (58) and 63 HRC.
<br> <br> tool material when the tool material having a high hardness, high wear resistance. However, the higher the hardness of the tool material, the lower the bending strength and impact toughness. The following is a brief introduction to the two materials used to make the tool.
High-speed steel is still one of the most widely used tool materials due to its high flexural strength and impact toughness and good machinability.
The coated tool has the characteristics of high surface hardness, good wear resistance, stable chemical properties, heat and oxidation resistance, low friction factor and low thermal conductivity. The coated tool can improve the tool life by 3~5 than the uncoated tool. More than double, increase the cutting speed of the tool by 20%~70%, improve the machining accuracy by 0.5~1, and reduce the tool consumption cost by 20%~50%.
As a result, coated tools have become the hallmark of modern cutting tools, and their use in tools has exceeded 50%. At present, various tools used in cutting, including turning tools, boring tools, drills, reamers, broaches, taps, thread combs, rolling heads, milling cutters, forming tools, gear hobs and shaper cutters, etc. Coating processes can be used to improve their performance.
There are four types of coated knives: coated high speed steel knives, coated carbide knives, and coated knives on ceramic and superhard materials (diamond or cubic boron nitride) inserts. But the previous two coated tools used the most. The coating on the ceramic and super-hard material blades is a material with a lower hardness than the base. The purpose is to improve the fracture toughness of the tool surface (more than 10%), reduce the chipping and breakage of the tool, and expand the range of tool applications. .
<br> <br> tool free form machining tool according to the surface of the workpiece can be divided into five categories. Tools for machining various external surfaces, including turning tools, planing knives, milling cutters, outer surface broaches and boring tools, etc.; hole machining tools, including drills, reaming drills, boring tools, reamers and internal surface broaches; thread processing Tools, including taps, dies, automatic opening and closing thread cutting heads, thread turning tools and thread milling cutters; gear processing tools, including hobs, shaper knives, shaving cutters, bevel gear machining tools, etc.; cutting tools, including inlays Tooth circular saw blades, band saws, hacksaws, cutting tools and saw blade milling cutters, etc. In addition, there are combination tools.
According to the cutting motion mode and the corresponding blade shape, the tools can be divided into three categories. General-purpose tools such as turning tools, planing knives, milling cutters (excluding formed turning tools, forming planers and forming cutters), boring tools, drill bits, reaming drills, reamers and saws; forming tools, cutting edges for such tools Having the same or nearly the same shape as the workpiece to be machined, such as forming turning tools, forming planers, forming cutters, broaches, conical reamers, and various threading tools; etc.; forming tools are used to process gears. Tooth surface or similar workpieces such as hobs, pinion cutters, shaving cutters, bevel gear planers and bevel gear milling cutters.
There are many factors that affect tool quality. Among them, hardness is one of the important factors that determine the quality of the tool. The hardness of the tool is determined by the material, and different materials determine the different hardness. The materials used to make the tool are generally: tungsten carbide, high speed steel, alloy tool steel, and the like. The hardness of the tool is generally between 56 (58) and 63 HRC.
<br> <br> tool material when the tool material having a high hardness, high wear resistance. However, the higher the hardness of the tool material, the lower the bending strength and impact toughness. The following is a brief introduction to the two materials used to make the tool.
High-speed steel is still one of the most widely used tool materials due to its high flexural strength and impact toughness and good machinability.
The coated tool has the characteristics of high surface hardness, good wear resistance, stable chemical properties, heat and oxidation resistance, low friction factor and low thermal conductivity. The coated tool can improve the tool life by 3~5 than the uncoated tool. More than double, increase the cutting speed of the tool by 20%~70%, improve the machining accuracy by 0.5~1, and reduce the tool consumption cost by 20%~50%.
As a result, coated tools have become the hallmark of modern cutting tools, and their use in tools has exceeded 50%. At present, various tools used in cutting, including turning tools, boring tools, drills, reamers, broaches, taps, thread combs, rolling heads, milling cutters, forming tools, gear hobs and shaper cutters, etc. Coating processes can be used to improve their performance.
There are four types of coated knives: coated high speed steel knives, coated carbide knives, and coated knives on ceramic and superhard materials (diamond or cubic boron nitride) inserts. But the previous two coated tools used the most. The coating on the ceramic and super-hard material blades is a material with a lower hardness than the base. The purpose is to improve the fracture toughness of the tool surface (more than 10%), reduce the chipping and breakage of the tool, and expand the range of tool applications. .
<br> <br> tool free form machining tool according to the surface of the workpiece can be divided into five categories. Tools for machining various external surfaces, including turning tools, planing knives, milling cutters, outer surface broaches and boring tools, etc.; hole machining tools, including drills, reaming drills, boring tools, reamers and internal surface broaches; thread processing Tools, including taps, dies, automatic opening and closing thread cutting heads, thread turning tools and thread milling cutters; gear processing tools, including hobs, shaper knives, shaving cutters, bevel gear machining tools, etc.; cutting tools, including inlays Tooth circular saw blades, band saws, hacksaws, cutting tools and saw blade milling cutters, etc. In addition, there are combination tools.
According to the cutting motion mode and the corresponding blade shape, the tools can be divided into three categories. General-purpose tools such as turning tools, planing knives, milling cutters (excluding formed turning tools, forming planers and forming cutters), boring tools, drill bits, reaming drills, reamers and saws; forming tools, cutting edges for such tools Having the same or nearly the same shape as the workpiece to be machined, such as forming turning tools, forming planers, forming cutters, broaches, conical reamers, and various threading tools; etc.; forming tools are used to process gears. Tooth surface or similar workpieces such as hobs, pinion cutters, shaving cutters, bevel gear planers and bevel gear milling cutters.
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