CN208245892U - One kind being used for the indexable circular milling cutter blades of heavy cutting - Google Patents

Abstract

An indexable circular milling insert for heavy-duty cutting, the shape of the insert is truncated, the thickness of the insert is 3.97mm, the diameter of the upper face is 10.00mm, the diameter of the bottom of the insert is 7.87mm, the front angle of the insert is 10°, the back The angle is 7°, the circular profile of the upper face is designed with a negative chamfer with a width of 0.26mm and a chamfer angle of ‑20° (1) a sine wave arc edge (2), and the insert is designed with a wavy rake face ( 3), the bottom surface of the blade is designed with a positioning groove (5), and the middle of the blade is designed with a fastening screw hole (4) for assembly and fixing. This new blade is mainly used in heavy-duty cutting. The blade is designed for heavy-duty cutting in view of the problems of heavy mechanical load, high cutting force, high cutting temperature, difficult chip breakage, short tool life and low cutting efficiency. Cutting indexable circular milling inserts.

Description

An indexable circular milling insert for heavy cutting

technical field

The utility model is suitable for the technical field of heavy-duty cutting, in particular to an indexable circular milling blade for heavy-duty cutting.

Background technique

AP1000 nuclear power unit is widely used in nuclear power plants in my country. The head of the evaporator water chamber is the core part of the unit, and the material is 508III steel, which is a difficult-to-machine material. During the heavy-duty milling process of the evaporator water chamber head, the cutting parameters are large (the cutting speed is generally 300~400m/min, the feed speed is 1~1.2m/min, and the cutting depth can reach more than 4mm), the cutting force is large, and the cutting temperature High, the chips are not easy to break, resulting in serious tool wear; the blank of the water chamber head is integrally forged, and there are defects such as surface hard oxide skin, forging folds, sand inclusions, etc. During the milling process, the tool is subjected to frequency conversion load and thermal shock, which is prone to damage , The service life of the tool is short, and multiple tool changes at the same time will reduce the cutting efficiency and increase the production cost.

Contents of the invention

The utility model aims at the problems of large cutting force, high cutting temperature, difficult breaking of chips, short tool life and low cutting efficiency in the heavy-duty cutting process of 508III steel forgings. The blade provides an indexable circular milling blade for heavy-duty cutting for the cutting of 508III molten steel chamber head forgings.

In order to achieve the above object, the technical scheme that the utility model takes is:

An indexable circular milling insert for heavy-duty cutting, the shape of the insert is truncated, the thickness of the insert is 3.97mm, the diameter of the upper face is 10.00mm, the diameter of the bottom of the insert is 7.87mm, the rake angle of the insert is 10°, and the rear The angle is 7°, the upper face is designed with a negative chamfer sine wave arc edge with a width of 0.26mm and a chamfer angle of -20°, the blade is designed with a wavy rake face, and the bottom of the blade is designed with a positioning groove. Designed with fastening screw holes for assembly and fixing.

The beneficial effects of the present invention are:

1. The shape of the blade is frustum-shaped, the thickness of the blade is 3.97mm, the diameter of the upper blade surface is 10.00mm, the diameter of the bottom surface of the blade is 7.87mm, the rake angle of the blade is 10°, and the rear angle is 7°. The blade structure is symmetrical, and the processing cost Low.

2. The blade is designed with a sine wave arc edge. When the blade cuts into the workpiece, it is impacted and sheared. During the cutting process, it is subjected to normal stress. The sine wave arc edge can effectively reduce the cutting force and impact, and enhance the cutting strength. And impact resistance, improve cutting efficiency, slow down the blade breakage.

3. The blade is designed with a wavy rake face and adopts a periodic sine wave. During the processing, the blade is balanced in force when cutting in and out, and the cutting is relatively stable. At the same time, the friction area between the blade and the chip during processing is reduced. , Reduce wear and improve the overall strength of the blade.

4. The blade is designed with a negative chamfer with a width of 0.26mm and a chamfer angle of -20° on the upper blade surface, which reduces the vibration caused by cutting and makes the cutting more stable. Improve the impact resistance, enhance the strength of the cutting edge of the blade, protect the tip of the blade, help to improve the durability of the blade, and better adapt to the mechanical impact load caused by intermittent cutting in the milling process.

5. The bottom surface of the blade is designed with a positioning groove, which can avoid the bad clamping caused by mechanical load during the heavy cutting process, play the role of fixing and reinforcement, reduce the vibration caused by cutting, make the cutting more stable, and improve the tool life .

Description of drawings

Fig. 1 is the top view of the blade of the present utility model;

Fig. 2 is a side view of the blade of the present utility model;

Fig. 3 is the three-dimensional structure diagram of the blade of the present utility model

Marks in the figure: 1-negative chamfer; 2-sine wave arc edge; 3-wavy rake face; 4-fastening screw hole; 5-positioning groove; 6-tool body support surface.

Detailed ways

Specific embodiment 1: In conjunction with Fig. 1 to Fig. 3, an indexable circular milling insert for heavy-duty cutting has a frustum-shaped insert shape, a insert thickness of 3.97mm, an upper cutter face diameter of 10.00mm, and a bottom surface of the insert The diameter is 7.87mm, the rake angle of the blade is 10°, and the relief angle is 7°. The circular profile of the upper knife surface is designed with a sine wave arc edge with a width of 0.26mm and a chamfer angle of -20°. The blade is designed with a wave shape. The rake face and the bottom surface of the blade are designed with positioning grooves, and the middle of the blade is designed with fastening screw holes for assembly and fixing.

Specific Embodiment 2: In conjunction with Fig. 1 and Fig. 3, an indexable circular milling insert for heavy-duty cutting described in this embodiment is designed with a wavy rake face and adopts a periodic sine wave. The force on the blade is balanced when cutting in and out, and the cutting is relatively stable. At the same time, the friction area between the blade and the chips during the processing is reduced, the wear is reduced, and the overall strength of the blade is improved. The undisclosed technical features in this embodiment are the same as those in the first embodiment.

Specific Embodiment Three: In conjunction with Fig. 1 and Fig. 3, an indexable circular milling insert for heavy-duty cutting described in this embodiment is designed with a sine wave arc edge. When the blade cuts into the workpiece, the sine wave arc edge It can reduce cutting force and impact, and enhance cutting strength and impact resistance. The undisclosed technical features in this embodiment are the same as those in the first embodiment.

Specific Embodiment 4: In conjunction with Fig. 1 and Fig. 3, the upper cutter surface of an indexable circular milling insert for heavy-duty cutting described in this embodiment is designed with a width of 0.26 mm and a chamfer angle of -20 ° negative chamfer reduces the vibration caused by cutting and makes cutting more stable. Improve the impact resistance, enhance the strength of the cutting edge of the blade, protect the tip of the blade, help to improve the durability of the blade, and better adapt to the mechanical impact load caused by intermittent cutting in the milling process. The undisclosed technical features in this embodiment are the same as those in the first embodiment.

Specific embodiment five: In conjunction with Fig. 2 and Fig. 3, a positioning groove is designed on the bottom surface of an indexable circular milling insert for heavy-duty cutting according to this embodiment, which can avoid the mechanical load caused by heavy-duty cutting. If the clamping is not good, it plays the role of fixing and reinforcement, reducing the vibration caused by cutting, making the cutting more stable and improving the tool life. The undisclosed technical features in this embodiment are the same as those in the first embodiment.

Claims (2)

1. one kind is used for the indexable circular milling cutter blades of heavy cutting, it is characterised in that: insert shape is truncated cone-shaped, and blade thickness is 3.97mm, upper knife face diameter are 10.00mm, and blade basal diameter is 7.87mm, and blade hook angle is 10 °, and relief angle is 7 °, upper knife face It is 0.26mm, negative chamfered edge (1) sine wave Circular Nose Cutting Edge (2) that chamfered edge angle is -20 °, blade design that circular contour design, which has width, Have waveform rake face (3), blade floor design there are locating slot (5), and blade medium design has the fastening for assembling and fixing Screw hole (4).

2. a kind of according to claim 1 be used for the indexable circular milling cutter blades of heavy cutting, it is characterised in that: knife before waveform Face (3) uses periodic sinusoidal waveform.