What are the functions and benefits of choosing a reamer for processing?

The diamond reamer has one or more teeth, and is used to cut off the thin metal layer on the surface of the hole. The hole processed by the diamond reamer can obtain accurate size and shape.

The reamer is used to ream the drilled holes on the workpiece, mainly to improve the machining accuracy of the hole and reduce the roughness of its surface. It is a tool for finishing and semi-finishing holes, and the machining allowance is normal. very small. Reamers for machining cylindrical holes are more commonly used. The reamer used to process tapered holes is a conical reamer, which is less used. According to the application, there are hand reamer and machine reamer. Machine reamer can be divided into straight shank reamer and tapered shank. The reamer, for hand use, is of the straight shank type. Most of the reamer structure is composed of the working part and the handle. The working part is mainly used for cutting and calibration, and the diameter of the calibration place has an inverted taper. The shank is used to be clamped by the fixture. There are straight shanks and taper shanks. There are many types of reamers according to different uses. Therefore, there are many specifications for reamers. Some of our more commonly used specifications are GB/ T1131 hand reamer, GB/T1132 straight shank machine reamer, GB/T1139 straight shank Morse taper reamer and so on.

Diamond reamer is divided into hand reamer and machine reamer according to the application method, and is divided into cylindrical reamer and conical reamer according to the shape of the reaming hole. (The standard cone reamer has 1:50 taper pin reamer and Morse taper. There are two types of reamer. The direction of the chip groove of the reamer has straight grooves and spiral grooves. The commonly used materials are high-speed steel. Carbide inserts, hand reamers are generally made of alloy tool steel (9SiCr), machine The reamer material is high-speed steel (HSS), and the machine reamer is divided into straight shank reamer and taper shank machine reamer.

The accuracy of the reamer has D4, H7, H8, H9 and other accuracy grades. According to the shape of the reaming hole, it is divided into three types: cylindrical, conical and stepped. There are two types of straight grooves and spiral grooves.

1. General precautions for manual reaming: ① The workpiece should be clamped upright. ② During the reaming process, the force of both hands should be balanced. ③ When the diamond reamer is withdrawn, it cannot be reversed. Chips are plugged between the back of the reamer teeth and the hole wall, scratching the hole wall; at the same time, the reamer is easy to wear. ④ After the reamer is used, it should be cleaned, coated with oil, and boxed to avoid bumping the cutting edge.

2. Pay attention to the reaming speed and cutting amount when reaming (check the metal cutting manual).

3. In reaming, a reasonable cooling lubricant must be used. The taper of the guide cone used by hand is small, the rake angle and the relief angle are small, the cutting edge is sharper, the ordinary land is narrow, or the guide cone is not pleasant.