Method of blade use and identification
Part two.
The correct use of the tool must first be able to identify the tool, any tool has its scope of application, will not be universal.A good tool should have the following characteristics:
1 good appearance (tool surface is bright, cutting edge is sharp, if there is a coating coating should be uniform);
2. Good manufacturing process performance (no cracks or cracks in the blade under a magnifying glass of 40 times
3. Good cutting performance (including high roughing efficiency for a certain material, high finishing surface quality, light cutting sound, etc.)
4. Good cost performance (including long tool life and large removal capacity);5 good stability (good consistency between each knife)
2）.Machining method of cutting tools
The machining method is divided into straight milling and reverse milling due to the difference between the direction of the cutting tool rotating into the workpiece and the direction of the cutting tool feeding.During the reverse milling process, the cutting thickness of the cutter teeth ranges from 0 to the maximum. The cutter teeth are easy to wear due to extrusion and friction on the workpiece surface.On the contrary, the cutting thickness of the cutter teeth is from the maximum to 0, easy to cut off the cutting layer, less wear of the cutter teeth, the data show that the milling can improve the tool durability dongguan diaobao equipment co., LTD. 2-3 times.When following the milling processing, the requirement of the workpiece side without hard skin (generally forging, grinding the steel surface will produce machining hardening), otherwise the tool is very easy to wear.
3).Cutting tools:
There are only three types of cutting tools:
Cutting form: one knife through, two - sided cutting, mainly used for cutting non - metallic materials
Slotting: bilateral cutting, the depth of the knife is shallow, mainly used for rough machining of metal and non-metallic materials, the strength of the tool is relatively weak;Single cutting single cutting has two kinds of situations, the depth of the knife is shallower, the cutting width is larger;The depth of the knife is deeper and the cutting width is smaller.It is mainly used for rough machining of metallic and non-metallic materials, and the tool strength is relatively weak.
4).Tool installation
The length of tool installation directly affects the machining quality of the workpiece. It is recommended that the hanging length of the tool be as short as possible.The third power of the tool overhang length is proportional to the amount of deformation. The longer the tool overhang length is, the larger the deformation is.The fourth power of tool diameter is inversely proportional to the amount of deformation, the smaller the tool diameter, the larger the deformation.Note: the
carving machine is using a spring card head, because the spring card head groove is very easy to accumulate debris processing organic materials, should be regularly soaked with organic solvents (such as oxygen), metal processing brush brush clean.Tool clamping will appear uneven tool wear, tool easy to break.
5).Tool wear
The milling process of tool wear is divided into three stages:
A in the initial wear stage, there are rough and uneven parts on the cutting surface of the new edge grinding tool, as well as defects such as micro cracks and oxidation. The cutting edge is sharp, the contact surface is small, and the compressive stress is large.As a result, wear is faster at this stage.
B. After initial wear, the rough surface of the tool has been smoothed out and entered into the normal wear stage, where the wear is slow and uniform and increases in approximate direct proportion with the extension of time.Therefore, this stage takes a long time.
C sharp wear phase when the width of the wear belt increases to a certain limit, the machined surface becomes rough, the cutting force and cutting temperature rise rapidly, and the wear rate increases rapidly, resulting in tool damage and loss of cutting ability.In order to use the cutting tools rationally in production, the machining quality should be avoided to reach this stage of wear.Before this stage comes, it is necessary to change the knife in time.
Tool blunt standard is tool wear to a certain limit can not continue to use, this wear limit is called blunt standard.
6).Tool durability
Tool durability the total cutting time elapsed from the beginning of cutting to the point at which wear reaches the tool dulling standard.The life of the tool can not be one-sided only mention the use of the longer the better, but to a certain extent to ensure the quality of the processing, timely replacement of the tool, the tool can be re-grinding several times to extend the overall use of the tool time.
7).Tool wear pattern
Cutting tools as consumables, cutting tools in the process of the front and rear knife surface and chip and workpiece often contact, produce violent friction, at the same time there is a high temperature and pressure in the contact area.Therefore, wear will occur on the front and rear knife surfaces.There are three types of wear :a. When cutting plastic material on the front cutter surface, the chip and the front cutter surface are in contact with each other, mainly to form crescent injection wear.When cutting a brittle material on the back cutting surface, the chip has a short contact length with the front cutting surface, while the back cutting surface has a large wear due to the blunt blade. When cutting steel, the reason for tool wear on the main cutting edge is usually different due to the great changes in the workpiece, tool materials and cutting conditions.Normal wear is mainly mechanical wear and thermal and chemical wear.
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