CN205200647U - Eccentric relief angle milling cutter - Google Patents

Abstract

The utility model discloses an eccentric relief angle milling cutter, including cutter arbor, blade and blade bearing, the blade passes through the blade bearing and installs at the cutter arbor tip. The blade adopts eccentric formula circular arc relief angle, and the back knife face of blade is the coincident arc surface of rotation center of the centre of a circle and cutter promptly. In when cutting, along with the rotation of cutter with feed, the back knife face of blade all the time and keep even clearance between the work piece machined surface, like this the tool clearance need not do too big, also can guarantee when the height feeds the cutting back knife face with work piece machined surface production interference. Because the blade has adopted eccentric relief angle, is guaranteeing that the unchangeable circumstances bottom knife of the angle of wedge can adopt the design of big anterior angle to make milling cutter cutting force toboggan, make small -size lathe realize big feed rate's high efficiency cutting. The design of circular arc relief angle simultaneously also can strengthen the intensity of knife tip.

Description

A kind of eccentric back angle milling cutter

technical field

The utility model relates to a milling cutter, in particular to an eccentric relief angle milling cutter.

Background technique

Milling cutter is a processing tool commonly used by milling machines in mechanical processing. Commonly used milling cutters are divided into integral milling cutters and discarding blade milling cutters. The blade-abandoning milling cutter is a tool that uses a non-regrinding blade as the cutting edge material, and the cutting blade is installed and fixed in the blade groove on the cutter body with screws to realize milling. The blade of the discarded blade milling cutter is generally made of powder metallurgy cemented carbide material, which is pressed and formed by a model, and then produced by sintering and edge passivation.

In milling, it is always hoped to complete the most processing tasks in the shortest time, so as to improve production efficiency. The way to improve efficiency is to use a higher feed rate during cutting. The rake angle of the tool and the level of feed speed directly affect the stress on the tool, especially when using a small machine tool and a slender tool holder. If the force is too large, the machine tool and the tool holder will vibrate, resulting in abnormal cutting conduct. If you want to reduce the cutting force, you need to increase the rake angle of the tool. However, due to the limitation of the toughness of the cemented carbide material, the wedge angle between the front and rear cutter faces of the tool cannot be made too small. If it is too small, it will affect the strength of the tool and cause the Pointed crack.

When the traditional linear relief angle milling cutter is used to cut the workpiece, the gap between the blade flank and the workpiece surface to be processed is shown in the S area in Figure 1. If the blade relief angle is not large enough, when the cutting feed rate is high, The flank will interfere with the surface of the workpiece to be processed; therefore, in order to ensure that the flank does not rub against the workpiece, the tool must have a large relief angle. In order to ensure that the blade has sufficient strength without breaking, it is necessary to ensure that the tool With a sufficient wedge angle, the blade can only choose a small rake angle, which increases the resistance during cutting and cannot achieve high-efficiency cutting.

Utility model content

In view of this, the utility model provides an eccentric relief milling cutter, which can greatly reduce the cutting force of the milling cutter under the premise of ensuring the strength of the cutting edge, so that the small machine tool can realize high-efficiency cutting at a high feed rate.

The eccentric relief milling cutter includes a tool holder, a blade and a blade holder, the blade is installed on the blade holder, and the blade holder is coaxially fixed with the cutter holder; the flank of the blade is the center of the circle and the Arc surfaces whose centers of rotation do not coincide, resulting in eccentric relief angles.

As a preferred mode of the present utility model, the radial butt joint surface between the blade holder and the blade is a stepped surface.

As a preferred mode of the present invention, the chip removal groove on the blade adopts a streamlined structure.

Beneficial effect:

The flank of the insert is designed as an arc surface whose center does not coincide with the center of rotation of the tool, without a large tool relief angle, and it can also ensure that the flank will not interfere with the workpiece surface to be machined during high-feed cutting ; Thus, under the condition of ensuring that the blade has sufficient strength, a large tool rake angle can be produced, which greatly reduces the cutting force, thereby greatly improving the cutting efficiency. cutting. The design of the arc relief angle can also enhance the strength of the blade.

Description of drawings

Figure 1 is a schematic diagram of the cooperation between the blade and the surface to be processed of the workpiece when the traditional linear relief milling cutter is cutting;

Fig. 2 is the overall schematic diagram of the cutter installed with the eccentric clearance angle milling cutter;

Fig. 3 is a schematic view of the end face of the eccentric relief milling cutter;

Figure 4 is a schematic diagram of the axial rake angle of the tool after installing the eccentric relief angle milling cutter;

Fig. 5 is an enlarged view of the blade holder and the installation position of the blade.

Among them: 1-tool holder, 2-blade, 3-blade seat, 4-tool rotation center, 5-back angle arc center, 6-flank face

detailed description

The utility model will be described in detail below in conjunction with the accompanying drawings and examples.

The utility model provides an eccentric relief angle milling cutter, which can greatly reduce the cutting force of the milling cutter and enable a small machine tool to realize high-efficiency cutting at a high feed speed.

The eccentric relief milling cutter comprises a tool holder 1, a blade 2 and a blade holder 3, the blade 2 is installed on the blade holder 3, and the blade holder 3 is coaxially fixed on the end of the cutter holder 1, as shown in Figure 2, The axis of the tool bar 1 is the center line of rotation of the tool. Among them, the tool bar 1 is made of high-strength mold steel, the quenching hardness is about HRC45, and the NI-P coating technology is used on the surface, so that the surface wear resistance is greatly improved. The blade 2 adopts an eccentric arc relief angle, that is, the flank 6 of the blade 2 is a circular arc surface that does not coincide with the center of rotation of the cutter (the cutter is the eccentric relief angle milling cutter), and the blade 2 After the insert seat 3 is installed on the tool holder 1, the arc center of the relief angle of the insert 2 does not coincide with the rotation center of the tool. As shown in Figure 3, the center of the flank 6 is located at the upper left of the tool rotation center. Creates an off-center relief angle. When cutting, with the rotation and feed of the tool, the flank 6 of the blade 2 always maintains a uniform gap with the surface to be processed, so that the tool relief angle does not need to be too large. It can also ensure that the flank 6 will not interfere with the surface of the workpiece to be processed. As shown in Figure 3 and Figure 4, due to the eccentric relief angle used for the two blades, the insert can be designed with a large rake angle of 20 degrees axial rake angle and 20 degrees radial rake angle.

In order to make the installation of the blade 2 more reliable, the blade holder 3 as shown in Figure 5 is adopted, and the radial butt joint surface between the blade holder 3 and the blade 2 is designed as a stepped surface.

The chip removal groove on the blade 2 adopts a streamlined design, which can greatly improve the chip removal effect.

In summary, the above are only preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (3)

1. An eccentric relief milling cutter, comprising a tool holder (1), a blade (2) and a blade holder (3), the blade (2) is installed on the blade holder (3), and the blade holder (3) It is coaxially fixed with the cutter bar (1); it is characterized in that the flank face (6) of the blade (2) is an arc surface whose center of circle does not coincide with the rotation center of the cutter, thereby generating an eccentric relief angle. 2. The eccentric relief milling cutter according to claim 1, characterized in that, the radial butt joint surface between the insert seat (3) and the insert (2) is a stepped surface. 3. The eccentric relief milling cutter according to claim 1 or 2, characterized in that, the chip removal groove on the insert (2) adopts a streamlined structure.