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Tools common knowledge

2020-04-08

The tool used in machining center is composed of general tool (also called working head or cutter head) and tool handle matching with the cone hole in front end of spindle of machining center. In the application, the tool should be selected correctly according to the requirements of the machining center machine tool, the requirements of the fixture, the properties of the workpiece material, the machining process, the cutting parameters and other related factors. The general principles of tool selection are: easy installation and adjustment of tools, good rigidity, high durability and precision. On the premise of ensuring safety and meeting the machining requirements, the tool length should be as short as possible to improve the rigidity of the tool.

 

In the machining center machine tool, each kind of tool is installed in the knife storehouse separately, according to the procedure stipulation carries on the automatic change knife. Therefore, the standard tool handle must be used so that the tools used in drilling, boring, expanding, milling and other processes can be quickly and accurately mounted on the machine tool spindle. The programmer should fully understand the structural dimensions, adjustment methods and adjustment range of the tool handle used on the machine tool, so as to determine the radial and axial dimensions of the tool when programming.

 

The cutting tools used in machining center machine tools must be adapted to the characteristics of high speed, high efficiency and high degree of automation in machining center. The tool handle part of the tool handle should be connected to the universal tool and installed on the machine tool spindle. Because of the different machining center type, the type and size of the tool handle part are different. the JT (ISO 7388) represents the cone shank part (with a manipulator gripper slot) used for machining center machine tools, and the numbers behind it are the corresponding ISO taper numbers, such as 50,45, and 40 represent the large end diameter of 69, respectively. 85.57. 15 and 44. 45 mm 7:24 taper. ST (ISO 297) for general numerical control cone handle part for machine tool (no manipulator holding slot), the digital meaning is same as JT class. BT (MAS403) represents a manipulator gripping groove connection for Japanese standard MAS403.

The intermediate rod has two types: equal diameter and variable diameter. The tool handle and working head module are connected according to different inner and outer diameter and length. The working head has a variety of types, such as transferable bit, coarse boring tool, fine boring tool, reaming drill, end milling cutter, surface milling cutter, spring chuck, tap chuck, Mo’s cone hole connecting rod, cylindrical handle tool connecting rod, etc. Select all kinds of high precision knife handle to identify titanium Hao, professional quality assurance! According to different machining workpiece size and process method, it can be combined into milling, drilling, boring, hinge, tapping and other tapping and other kinds of tools for cutting. General purpose cutters are available on the basis of the material used in the manufacture are divided into the following categories :(1) high-speed steel tool ;(2) cemented carbide tool ;(3) diamond tool ;(4) other material, such as ceramic tool.

 

The cutting process of the tool is very complicated, and there are many influencing factors. Choose to process all kinds of high-quality workpieces to identify titanium Hao machinery, professional quality assurance! Because of professional, so outstanding! In milling, the performance of tool materials, tool types, tool geometry parameters, cutting speed, cutting depth and feed rate all affect the cutting force, thus affecting the whole process system, and finally affecting the machining accuracy and quality. The spindle speed of the machining center machine is at least 1 to 2 times higher than that of the common machine tool. Therefore, the machining center is milling to select the tool size and the machined tool the surface size of the piece is suitable.

 

In plane milling, the end milling cutter or end milling cutter of cemented carbide should be selected. Generally use the second cutter, the first cutter is best end milling cutter rough milling, along the workpiece surface continuous cutter. Choose the width of each cutter and milling cutter diameter, so that the joint marks do not affect the precision of finishing milling. Therefore, when machining allowance is large and uneven, milling cutter diameter should be selected smaller.

 

When finishing, the diameter of the milling cutter should be larger, it is best to be able to accommodate the entire width of the machining surface. In the actual work, the semi-finishing and finishing of the plane, generally with the transferable dense tooth surface milling cutter, can achieve the ideal surface processing quality, and even can achieve milling instead of grinding. the dense cutter teeth greatly improve the feed speed and thus improve the cutting efficiency. When fine cutting plane, can set 2 to 4 cutter teeth

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Transposable spiral end milling cutter is suitable for high efficiency rough milling large workpiece step surface, elevation and large groove processing. Such as the replacement of different grades of blades, can be processed steel, cast iron, cast steel, heat resistant steel and other materials. cemented carbide spiral tooth end milling cutter is a kind of finishing tool for machining cast iron, steel parts, non-ferrous metals, and the blade is generally welded.

 

End milling cutter and end milling cutter with cemented carbide blade are mainly used for machining bump, groove and box face. In order to improve the machining accuracy of slot width and reduce the type of milling cutter, milling cutter with smaller diameter than slot width is used in machining. The middle part of the slot is first milling, and then milling the two sides of the slot by using the function of tool radius compensation (or diameter compensation).

 

The peripheral contour of milling disc parts generally adopts end milling cutter. The tool radius of the end milling cutter used must be less than the minimum curvature radius of the contour inside the part. generally take 0 of the minimum radius of curvature. 8 to 0. Nine times. he machining height of the part (the depth of the cutter in the Z direction) is best not to exceed the radius of the cutter. If milling blank surface, it is best to choose cemented carbide corrugated end milling cutter, it can be used in machine tools, tools, workpiece system to allow for strong cutting.

 

In short, machining center machine tool is a more complex system, how to choose correctly according to the actual situation, is the programmer must master. Only with full understanding and understanding of tool structure and selection in machining center can it be used flexibly in practical work to improve work efficiency and safety production.

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