Cutting plate

 

The invention relates to the processing of materials by cutting, fine cutting. The cutting plate includes a cutting element of the superhard material with a curved cutting edge formed by the intersection of the front and rear surfaces. To obtain a low roughness of the processed surface by reducing the complexity of grinding the back surface of the cutting element of superhard material made in the form of two intersecting conical surfaces with parallel axes. With this cutting edge includes Central and side sections, and the radius of curvature of the Central section of greater radius of curvature of the side portions. 4 Il.

The invention relates to the treatment of materials by cutting, in particular for fine turning.

Known cutting plate, equipped with a cutting element of superhard material, in which the cutting element has two cutting edges formed by the intersection of the flat front and rear surfaces (VP of Jedi and other Cutting tools, with superhard and ceramic materials and their applications: a Handbook. - M.: Mashinostroenie, 1987, S. 50-51).

The main disadvantages of the known plate apply the x alloys plate, equipped with polycrystalline diamond).

To obtain the necessary in this case, the magnitude of the radius between the cutting edges of the plate (usually more than 2 mm), you need to Shine at sharpening a significant amount of material that, because of the very low grindability of superhard materials, will lead to an unjustified increase in the complexity of sharpening.

The objective of the invention is obtaining a low roughness of the processed surface by reducing the complexity of the grinding plate.

This objective is achieved in that the cutting plate containing the cutting element of superhard material with a curved cutting edge formed by the intersection of the front and rear surfaces, the rear surface of the cutting element of superhard material made in the form of two intersecting conical surfaces with parallel axes, with the cutting edge includes Central and side sections, and the radius of curvature of the Central section of greater radius of curvature of the side portions.

In Fig.1 - cutting plate in isometric in Fig.2 is a top view, Fig.3 - section a-a in Fig.2, in Fig.4 - scheme to the choice of parameters of the insert.

The cutting element 1 (Fig.1) in the form of a truncated cone, having the radius r, is the front surface of the cutting element 1 and the side surface of the cone is part of the rear surface of the cutting element, forming the lateral parts 3 and 4 of the cutting edge with a radius of curvature r.

The intersection of the surface of a cone whose axis O2-O2parallel to the axis About1-O1the source of a truncated cone (Fig.2, 3), and the front surface of the cutting element is formed of a Central section 5 of the cutting edge (Fig.1) having a radius of curvature R, with R>r.

This site provides reception given the surface roughness and is created by grinding, which is a layer of material with a maximum thickness of(Fig.4). The value ofspecifies the length of the active part of the cutting edge 5. This length is characterized by the dimension b (Fig. 4).

To obtain the required geometry of the cutting plate, you need to find a cutting element with a base radius of the cone r, the smaller the selected value of R, and to sharpen the conical rear surface having the axis O2-O2and the angle of inclination of the generatrix axis(Fig.3), providing the value of b. Thus the value of the removal tool of the control edges, equal to the R.

Example. For the cutting element with r=1.8 mm (a radius have, for example, diamond-carbide cutting inserts SVBN) to get R=3 mm and b=1 mm, must be removed for sharpening layer of material with a maximum thickness ofequal 0,132 mm For famous plate with the angle between the edges in the plan, equal to 90 degrees, obtaining a radius equal to 3 mm, would require removal of the layer of superhard material with a maximum thickness of 1,242 mm With R=4 mm the maximum reading for the claimed and known plates respectively 0,176 1,656 mm and mm, R=5 mm - 0.2 mm and 2.07 mm

The cutting plate according to the present invention operates as follows. Initially, the work enters one of the side portions of the cutting edge 3 or 4 (depending on the feed direction), removing the major part t' of the allowance for processing t (Fig.4). Then the Central part of the cutting edge 5 cuts off the remaining portion of the allowance t", removing machining marks left lateral part of the cutting edge.

Cutting elements are mounted in housings standard carbide inserts, including a Central hole. It is advisable to use a cutting element as part of a truncated cone, having a plan is cutting element in the form of a sector, used in the known plates, and a slot in the plate under the cutting element is more technologically advanced.

The application of the proposed insert will allow you to get a low roughness of the machined surface while reducing the complexity of the grinding plates.

Claims

The cutting plate containing the cutting element of superhard material with a curved cutting edge formed by the intersection of the front and rear surfaces, wherein the rear surface of the cutting element of superhard material made in the form of two intersecting conical surfaces with parallel axes, with the cutting edge includes Central and side sections, and the radius of curvature of the Central section of greater radius of curvature of the side portions.

 

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