RU1808517C - Built-up end mill - Google Patents

Abstract

Usage: metalworking, design of metal cutting tools. SUMMARY OF THE INVENTION: The milling cutter comprises a housing, in the slots of which the main insert knives with corrugations and additional are fixed; wearable. peeling and cutting knives. Additional knives are mounted on the body between the main knives with the possibility of axial adjustment. The tops of peeling knives are offset relative to the tops of the main ones. The vertices of the cutting knives are located at the level of the vertices of the main knives. 3 il ..

Description

The invention relates to metalworking, in particular to structures of cutting tools.

The purpose of the invention is to increase durability, increase productivity, improve processing quality and ensure ease of technical execution.

This goal is achieved by the fact that a standard face mill, comprising a body and insert knurled knives, is equipped with additional cutting and peeling knives mounted alternately between the main knives. Additional knives have a body part in the form of a rectangular parallelepiped, based on the milling cutter on three sides: on pre-processed areas of the periphery of the milling cutter body; on the main knife following the additional knife; on the persistent adjusting screw. The aforementioned additional knives are unifiedly attached to the body with two screws through a groove parallel to the axis of the cutter. Adjusting screws

They are located in a thrust disk mounted on the upper end of the mill body, and are designed to base and control the axial outreach of additional knives.

Peeling knives, having a special blade geometry, are located in the area of the proposed crust on the surface to be treated and take on the functions of removing this crust during the cutting process, unloading the main knives.

Cutting knives, also having special blade geometry, are located in the region of the top of the blade of the main knives and provide unloading of this peak during cutting, and also, due to the radius at its top, improve the quality of the processed surface.

The main knives bear the main load when machining with this milling cutter, however, they work under conditions of free cutting without the adverse effect of the crust, as well as with an unloaded top, which increases their durability. In this case, the mortality (L

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There is a need for sharpening the angle in the plan on the main knives, which also increases their resistance, because there are no residual stresses arising in the soldered joint of the carbide plate and the knife body during sharpening.

The blade geometry of the additional knives allows axial cutting forces to be obtained during the cutting process, which presses the cutter against the workpiece, which increases its stability, reduces vibrations, facilitates the cutting process and improves the quality of the machined surface.

Tests of the cutter showed that it is capable of machining at higher cutting mode elements compared to the prototype, namely, the depth of cut, feed rate and speed of the main movement, which leads to an increase in processing productivity.

The use of a common and relatively cheap known milling cutter as a basis for creating the proposed design of a milling cutter leads to the simplicity of its technical execution.

In FigL shows a prefabricated end mill, view from the bottom; figure 2 is a view along arrow a in figure 1; in Fig.Z - section bB in Fig.2.

The prefabricated end mill consists of a body 1, in which wedge grooved grooves are made for fastening the main knives 2. Additional cutting 3rd peeling 4 knives are mounted on pre-machined areas of the periphery of the body 1 with two screws 5 through grooves made in the body part parallel to the axis of the mill additional knives 3 and 4. Adjusting 6 are located in the thrust disk 7, attached to the upper end of the cutter with screws 8..

The setting of the cutter is as follows. .

After sharpening the main knives, additional knives are attached to the cutter. When the screws 5 are loosened, with the help of screws 6, additional knives are set to the required height depending on the required cutting depth so that the blades of the peeling knives 4 are located in

area of the proposed crust being processed, i.e. at the level of the estimated depth of the minus minus 1.5-2 mm, and the blades of the cutting knives 3 are 0.1 mm lower than the level of the main knives. After that, the screws 5 are clamped,

and the screws b counter to the disk 7 with lock nuts 9.

Additional knives 3 and 4 may not be installed in each gap between the main knives, depending on the specific processing conditions. When processing on rotary double-spindle milling machines, the second chipper can only be equipped with cutting knives 3 installed in each interval between

main knives 2.

Tests of the cutter showed that its resistance to the processing of cast iron billets with a crust in comparison with the prototype increases on average 1.5 times. In this case, the depth

cutting can be increased on average by 2-3 mm, and the spindle speed is increased by 1-2 steps, which increases productivity. The roughness of the treated surface is improved by an average of 2-3 classes.

Claims (1)

SUMMARY OF THE INVENTION A prefabricated end mill, comprising a body, in the grooves of which are inserted knives with corrugations, which, in order to increase productivity and improve the quality of processing, the mill is equipped with additional knives for grinding and trimming mounted on the body with the possibility of axial adjustment between the main knives, Moreover, the tops of peeling knives are installed with an offset relative to the tops of the main knives, and the tops of the cutting knives are set at the tops of the main knives.