Basic concepts of the hottest reaming and reamer

2022-08-13
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The basic concept of reaming and reamer

reaming

using reamers to cut thin layers of metal from the machined hole wall to obtain accurate hole diameter and geometry and low surface roughness. Reaming is generally carried out after drilling, reaming or boring. It is used to process precision cylindrical holes and taper holes. The processing aperture range is generally 3 ~ 100 mm. Due to the long cutting edge of reamer, all cutter teeth participate in cutting at the same time during reaming, which has high production efficiency and is widely used in hole finishing

the working mode of reaming is generally that the workpiece does not move, and the reamer rotates and feeds axially into the hole. When reaming on the lathe, the workpiece rotates and the reamer makes axial feed. In the reaming process, the cutting part at the front end of the reamer is cut, and the later calibration part plays the role of guidance, vibration prevention, polishing and calibration. The size and geometric accuracy of reaming are directly determined by the reamer. Reaming can be divided into rough reaming and fine reaming. It is generally carried out on lathe, boring machine or drilling machine, which is called machine hinge, and it can also be reamed manually. The cutting depth (unilateral machining allowance) of rough hinge is 0.3 ~ 0.8mm, which is not suitable for use. The machining accuracy can reach it10 ~ 9, and the surface roughness is RA10 ~ 1.25 M. The cutting depth of fine reaming is 0.06 ~ 0.3mm, the machining accuracy can reach it8 ~ 6, and the surface roughness is ra1.25 ~ 0.08 M. The cutting speed of reaming is low. For example, when steel parts are reamed with a carbide cylindrical multi edge reamer, when the aperture is 40 ~ 100mm, the cutting speed is 6 ~ 12m/min and the feed rate is 0.3 ~ 2mm/R. Correct selection of cutting fluids such as kerosene, machine oil or emulsion can improve reaming quality and tool life, and is conducive to reducing vibration

reamer

a rotating tool with one or more teeth used to cut a thin layer of metal on the surface of a machined hole. The reamed hole can obtain accurate size and shape. Reamers are divided into two types according to the method of use: machine use and machine use; According to the shape of the reamed hole, there are three kinds: cylindrical, conical and stepped; According to the development of 3D printing materials, the perfect material clamping methods are divided into two types: handle type and suit type; According to the shape of the tooth groove, it is divided into straight groove and spiral groove. The picture shows several common reamers

cylindrical hole reamer is composed of working part, neck and shank. The working part is divided into cutting part, calibration part and inverted cone part; The hand reamer can not be equipped with inverted cone part. The size of the main deflection angle Kr mainly affects the surface roughness, accuracy and axial force of the reamed hole. Generally, Kr of the machine reamer is equal to 15 °. When the equipment runs for a period of time, Kr of the hand reamer needs to be replaced = 31 '~ 1 °. The calibration part is cylindrical, which plays the role of repairing the hole wall and calibrating the hole diameter. The diameter of the inverted cone part gradually decreases towards the handle (0.03 ~ 0.07mm) to reduce the friction between the working part and the hole wall of different fixtures that can be installed during reaming. The tooth groove of reamer is usually straight groove. When machining holes with discontinuous hole wall or longitudinal groove in the length direction, the spiral groove reamer works stably and removes chips well. The working part of the reamer can be made of high-speed steel or cemented carbide. The hand reamer can also be made into a diameter adjustable type, which has two structures: the adjustable reamer is to adjust the nuts at both ends to make the wedge-shaped blade move along the inclined bottom groove on the cutter body to change the diameter size of the reamer; Expandable reamers expand the diameter of reamers with longitudinal grooves through the movement of steel balls. The reamer with adjustable diameter is suitable for mechanical repair. (end)

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