Introduction to Milling Cutter (1)

1 、Quickly handle the chuck of the milling cutter

   Due to the large milling force of milling , the mounting of the milling cutter is also required to be firm and reliable. Therefore, it is time-consuming, laborious and unsafe to replace the milling cutter. As shown in the figure, a chuck structure for quickly loading and unloading a milling cutter is used. When loading and unloading cutters, it is not only fast but also labor-saving and safe.

   The outer cone of the collet body 7:24 taper, and the vertical milling machine spindle taper hole fitting, after loading lever from the spindle taper hole after tightening without disassembly of the rear end of the spindle. The sleeve sleeve achieves a small clearance fit through the outer circle and the inner hole of the main body. The lower end of the taper sleeve has a left-handed external thread that matches the left-handed internal thread on the lower end of the body. The inner taper of the taper sleeve is Morse No. 4 taper, matching the morse taper shank of the milling cutter. The large outer circle of the sleeve is milled into a hexagon for tightening the sleeve with a wrench. Double studs are used to connect the main body and the milling cutter.

Before installing the tool, insert the sleeve into the body and tighten it with the left thread in the body. Then, screw the stud 2 into the tapped hole of the taper shank and insert the taper shank cutter into the taper sleeve, and insert the other end of the stud into the screw hole of the body's tail end. In order to make the cone sleeve inner hole and the milling cutter's taper shank in close contact, the hexagonal right-handed conical sleeve at the lower end of the taper sleeve is clamped by a wrench, and the taper sleeve is moved downwards and tightly contacted with the milling cutter taper shank. At the same time, the taper shank of the taper sleeve gives the milling cutter a right-hand turn with a friction force on the taper shank of the milling cutter. Under the action of the double-headed stud, the milling cutter moves upward, and the taper sleeve and the milling cutter contact tightly, thus making the milling cutter The handle is locked. When removing the milling cutter, use a spanner to hold the hexagonal left-handed conical sleeve at the lower end of the taper sleeve. The taper sleeve moves upwards and disengages from the taper shank of the milling cutter to unscrew the milling cutter. To install a small-diameter taper shank cutter, first make a corresponding taper sleeve and double-headed studs, which are now installed in the taper sleeve.

To install a straight-shank milling cutter, first make a taper sleeve, spring chuck, and lock nut. When using, screw the sleeve into the main body, select the corresponding size of the spring chuck according to the diameter of the milling cutter shank, and then use the lock mother to screw in the external thread of the main body to lock the spring chuck and the straight shank milling cutter in the cone. In the middle, milling can be performed.

All the above parts are made of 45 steel, except for spring chucks made of spring steel 65Mn and quenched. They are also tempered and tempered to a hardness of 28 to 32 HRC .

2 , simple end mill unloader

One of the characteristics of the milling process is that the cutting force is large, and it is interrupted cutting and there is vibration in the cutting. When a cylindrical end mill is used, although the cutting force is reduced, the vibration is also lost, but the cutting force tends to incline the cylindrical end mill and pull the tool downward. Therefore, no matter what type of milling cutter is used for milling, the chucking force of the milling cutter must be large enough to ensure that the milling cutter, such as the end mill, does not fall off during the milling process, causing accidents and damage to the workpiece, and also avoids injury. As a result, the disassembly of the milling cutter has been made more difficult. In response to this problem, a simple end mill unloader can be designed and mounted on the side of the milling table.

There are two cylindrical bosses above the simple unloader. When the end mill is to be disassembled, the table of the milling machine is moved so that the unloader is located below the end mill and the two cylindrical bosses on the unloading stand are stuck. In the open slot of the end sleeve skirt of the end mill shank, the end milling machine is then turned on so that the spindle of the end mill can be reversed and the end mill can be easily removed.

Pay attention to the end mill removed by hand to prevent the end mill from falling to the ground and damage its accuracy.

The end mill unloader has a simple structure, is easy to manufacture, install and use, and can also protect the middle sleeve and end mill.

3 , more knife hole adjustable milling chuck

The milling head is mainly composed of a taper shank, a fixed blade body, a movable blade body, an adjusting bolt, a left and a right pressing plate, and the like. There are three knife holes in the same direction as the taper shank in the lower part of the movable knife body. The middle knife hole can be equipped with various tools such as drill, keyway milling cutter, reamer, end mill, face milling cutter and boring cutter. This tool hole allows the mounted tool to be coaxial with the spindle of the milling machine. The knife holes on both sides of the middle hole are mainly equipped with a boring knife. By adjusting the adjusting bolts on the side of the milling chuck, the lateral position of the movable blade body can be adjusted laterally. The movable blade can drive the cutter on it or remain coaxial with the spindle, or it can maintain a certain eccentricity from the center line of the spindle. The amount can be selected according to the dial of the adjusting bolt end face, the large adjustment distance is 20mm .

In the processing, the mounting position and adjustment amount of the tool are determined according to the size of the processing hole, and then the tool holder is fastened on the movable blade body with the internal large angle screw, and then the movable blade body is fixed with the fixed blade body with the hexagon socket screw. , so that the corresponding processing can be done.

In the transverse hole of the movable blade body, special tool boring holes, milling holes, etc. can be installed to process certain specific surfaces.