RU2568231C1 - End mill for laminated plastic treatment - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: mill contains casing with shank, and elongated and shortened periphery cutting edges located along spirals with opposite inclination, last of them are ended by end teeth. Casing in cutting part zone is made with cross-section profile close to rectangular, curved at angle of elongated periphery cutting edges located at smaller sides of the casing profile ended by square, at its free corners not coinciding with the casing profile the shortened periphery cutting edges are located. The end teeth of them project below the end of the elongated edges, and grooves for shaving removal are the entire space not occupied by the mill rod.

EFFECT: possibility of the laminated plastic treatment without delamination of the external layers and free shaving removal.

5 dwg

Description

The invention relates to the field of engineering, in particular to the mechanical processing of materials by cutting, and can be used in the construction of mills.

Known end mill according to patent RU No. 74324, IPC VC 5/10 (2006.01) for a utility model containing a shank and a cutting part, consisting of a number of teeth placed around the circumference along a helical line and separated by chip grooves. Its essence concerns the implementation of the groove profile defined by the corresponding equations, primarily in terms of the design of the cutting edge of the teeth.

Known end mill according to the application for invention RU No. 94029349 A1, IPC ⁶ V23C 5/10, consisting of a housing with screw cutting plates placed on it. The invention relates to the sharpening angles of the cutting inserts, at which the cutting forces act on the teeth, pressing them to the supporting surfaces of the housing, and the console of the cutting edge minimized significantly increase its strength.

When using the aforementioned milling cutters when processing plates of layered plastics along a contour or processing grooves, the upper layers of plastic are peeled off, since the vertical component of the cutting force of the curved cutting edges of the right inclination acts on the separation of the upper layers, while the lower layers of plastic of the same component are pressed against an array of plastic.

With a left inclination of the cutting edges, the situation changes to the opposite.

The so-called "chevron" milling cutters are also known according to the patent US 20130294852 and patent US 2013059585, IPC VC 5/10, dated 11/07/2013 A1, containing a body and two groups of cutting edges located along helical lines with opposite inclination at different levels along the length of the body .

When processing laminated plastics along the perimeter, the vertical components from the cutting forces of the first and second groups of cutting edges are directed toward pressing the upper and lower layers of the laminated plastics, which eliminates their delamination (reduces the likelihood of peeling of the upper and lower layers). But when processing blind grooves, the accumulating chips in the chip-guiding grooves do not have the ability to exit upward from the zone of the lower group of cutting edges, which makes it difficult to process such grooves: the chip-guiding grooves of the lower group of cutting edges raise the chips up, and the upper group, on the contrary, down. These two chip flows are found at the boundary of the cutting edge groups.

The closest in design and operation principle to this proposed invention is the end mill according to patent RU No. 125502 U1, IPC В23С 5/10 (2006.01) for a utility model containing a shank and a cylindrical cutting part with straight and end cutting edges. It is additionally equipped with oblique shortened cutting edges, inclined at an angle to the axis of the cutter and ending also with end cutting edges in the same plane perpendicular to the axis of the cutter.

Oblique shortened cutting edges of this milling cutter are located in common chip-cutting channels with straight cutting edges, which greatly facilitates chip removal during processing of blind grooves. But in this case, and when processing the plates around the perimeter, the upper layers of plastic with a cutting force are not pressed against its array by straight cutting edges.

The aim of this invention is to prevent peeling of the upper layers of plastics during their processing to ensure free removal of chips.

The essential features of the cutter design to achieve this goal are: execution of the cutter body with a cross-sectional profile close to a rectangular one, twisted at an angle of elongated peripheral cutting edges located on the smaller sides of the housing profile ending in a square, in the corners of which do not coincide with the profile housings, shortened peripheral cutting edges with an opposite slope are located, the front teeth of which protrude below the end of the elongated cutting edges, and the chips The driving grooves are the entire space not occupied by the profile of the body.

The proposed design of the end mill is illustrated by drawings.

In FIG. 1 shows a general view of the cutter; in FIG. 2 - design of the cutter; in FIG. 3 and FIG. 4 - sections aa and bb in FIG. 2, respectively; in FIG. 5 is a view B in FIG. 2.

The end mill (Fig. 1, 2) consists of a housing 1 with a shank 2, elongated peripheral cutting edges 3 located along helical lines with a left-handed inclination, and shortened peripheral cutting edges 4 (at the end end of the milling cutter) with a right-hand inclination ending with end teeth 5.

The mill body 1 is made with a cross-sectional profile 6 close to a rectangular one (Fig. 3), twisted at an angle of elongated peripheral cutting edges 3 located on the smaller sides 7 of the body profile. The housing 1 ends with a square 8 (Fig. 4), in the free corners of which do not coincide with the profile of the housing, there are shortened peripheral cutting edges 4 with end teeth 5 protruding below the end of the elongated peripheral cutting edges 3 by up to half their length (Fig. 2, 5).

The cutter has a chip-leading groove 9 (Fig. 2, 5) in the form of the entire space not occupied by the profile 6 of the housing.

The principle of operation of the cutter is as follows.

When processing plates of laminated plastic along the contour, the lower end of the cutter is located below the level of the processed plate. Then, with right rotation, the elongated peripheral cutting edges 3 of the milling cutter having a left slope will press the upper plastic layer to the array of plate material, and the shortened peripheral cutting edges 4 with their opposite inclination, on the contrary, will press the lower layers of plastic to its array, excluding their peeling .

When processing blind grooves, the lower part of the cutter will be in the material array, the right inclination of the shortened teeth facilitates chip removal along the end surface, and the upper layers of the plastic, as in the previous case, will be pressed by the vertical component of the cutting force of the elongated peripheral cutting edges 3.

In the process of processing in all cases, a large free volume not occupied by the profile 6 of the mill body 1 (chip cutting grooves 9) facilitates chip removal.

According to this proposed invention, drawings are developed and the experimental samples of mills are worked out with positive results at this stage.

Claims (1)

An end mill for processing laminated plastics, comprising a body with a shank and peripheral cutting edges, characterized in that the peripheral cutting edges are made in the form of elongated edges located along helical lines with a left-side inclination, and shortened edges located with a right-side inclination at the end end of the mill with the formation of end teeth, and the body is made with a cross-sectional profile close to rectangular, twisted at an angle of inclination of the elongated peripheral cutting edges located on on the sides of the profile of the body ending with a square, while the shortened peripheral cutting edges are located in the corners of the said square that do not coincide with the profile of the body, the front teeth protrude below the end of the elongated peripheral cutting edges by less than half their length, and the space not occupied by the body forms chip cutting grooves.

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