Carbide tipped rotary cutting tool

 

(57) Abstract:

Usage: mining industry, particularly the manufacture of cutting tools for mining and road machines. The inventive carbide tip contains cutting, cylindrical flange and the supporting part. On the conical surface of the support part are two groups of tabs. The ratio of the diameters of the circles, which are the corresponding groups of protrusions, is 1.3 to 1.5. On the cylindrical surface of the flange part are centering elements. The tabs are displaced relative to each other around the circumference. 1 C. p. F.-ly, 2 Il.

The invention relates to the mining industry and can be used in the manufacture of cutting tools for mining and road machines.

Known carbide tip used in cutting tools for road machines containing cutting, cylindrical, flanged and tapered bearings [1] On the conical surface of the supporting part of the famous carbide tip made evenly spaced around the circumference of the spherical protrusions, which allows you to create a uniform gap between the two designed the aqueous seam on the entire surface of the solder joints.

However, a small area of the soldered connection of the tip and body of the cutting tool, which includes only the surface of a truncated conical protrusion and the lower end surface of the flange part, reduces the resistance of the tip of the fracture, despite the constant thickness of the solder joint. This is because the absence of the solder joints of the carbide tip and the tool body along the perimeter of the cylindrical surface of the flange portion of the tip causes arising during operation of the tool, the moment of forces is the cause of the breaking of the carbide tip of the socket body with little effort cutting. Ultimately, the service life of the carbide tip ends long before the moment of its full depreciation, which significantly reduces the efficiency of cutting tools in General.

Known carbide tip for rotary cutting tool, which is taken as a prototype, containing cutting, cylindrical flange and the supporting part [2]

On the conical surface of the supporting part of the tip is made evenly spaced around the circumference of the protrusions that when installing the NAC is e, thus providing the correct relative positions of the tip and the tool body before soldering.

The presence of solder joints known tip and tool body along the perimeter of the cylindrical surface of the flange portion of the tip can significantly increase the area of the soldered seam and thereby to increase the strength of the connection.

However, the location of the tabs on the conical surface of the reference part of the famous tip circle of the same diameter, and therefore, the contacting of the tip and the tool body at points corresponding to the location of the projections, focusing the shock load on the tip and the tool body when in the local area, limited by the diameter of a circle, but which are protrusions, and does not allow you to evenly distribute the load across the supporting conical surface of the solder joints, which affects the strength properties of the tip, which determines its performance. The tool life is also reduced by the presence in the socket housing of the tool ring grooves, with which the contact protrusions of the tip, which, by its nature, the concentration of the aqueous tip is not sufficient for rigid fixation of the tip in the socket housing of the tool with the aim of placing it relative to the axis of the tool and the lack of bias in terms of automating the process of soldering.

The purpose of this invention is the creation of a carbide tip for rotary cutting tool of such construction that would ensure the elimination of the typical tips known constructions defects while improving performance properties of the proposed tip.

The technical result is achieved by the fact that the carbide tip rotary cutting tool containing cutting, cylindrical flange and the supporting part, on the conical surface of which the last made group of projections of the same height, evenly spaced on a circle of diameter d1according to the invention, the conical surface of the base portion of the tip is provided with additional projections of the same height, evenly spaced on a circle of diameter d2and the cylindrical surface of the flange portion of the tip is provided with evenly spaced around the circumference of the centering elements have the same height, with the tabs around the circumference of diameter d2shifted in the circumferential direction relative to the tabs, located on a circle of diameter d1that ocher is istihaada the that the ratio of the diameters of circles d1and d2where there are groups of protrusions, amounts to 1.3-1.5.

In Fig. 1 shows a carbide cutting tip of Fig. 2 - rotating cutting tool with carbide tip Assembly.

Carbide cutting tip 1 according to the present invention includes cutting 2, a cylindrical flange 3 and the support 4 pieces. The cutting part 2 of the handpiece made in the form of at least two mating surfaces, providing in shape fast break tip when cutting and sufficient strength when subjected to shock loads. The cylindrical surface of the flange portion 3 of the handpiece contains evenly spaced on its periphery a longitudinal centering elements 5 of the same height, providing fixation of the tip in the socket housing relative to its axis and the absence of bias in terms of automating the process of soldering. The supporting part 4 of the handpiece is made of the mating conical and truncated spherical surfaces, providing additional stability to the tip in the body of the tool and increasing the area of the solder joints. The conical surface of the support frequent is winetech different diameters d1and d2. While the protrusions 6, located on a circle of diameter d2shifted in the circumferential direction relative to the projections 6, which are located on the circle with diameter d1which in turn shifted in the circumferential direction relative to the centering elements 5. This arrangement of the projections 6 and the centering elements 5 relative to each other facilitates wicking of solder in the soldering process in the gap between the surfaces of the tip and the tool body, and the protrusions 6 and the centering elements 5 of the same height allows you to create the conditions for receiving the solder seam guaranteed constant thickness over the entire surface of the solder joints. The location of the projections 6 on the conical surface of the supporting part 4 of the tip in circles of different diameters is dictated by the need to evenly distribute shock loads acting on the carbide tip at the contact points of the projections 6 with the surface of the socket tool. However, in order to achieve the maximum effect of the distribution of loads across the surface, the ratio of the diameter d1the circle, which is one group of tabs, to the diameter d2the circle, which is another g is a significant reduction effect associated with the approach of the two groups of tabs relative to each other and the concentration of impact loads in the local area, limited by the diameter of the same circle, similar to the known structure [2] which affects the strength properties of the tip. The increase in the ratio of diameters of more than 1.5 will entail structural changes of the tip, which will be reflected either by weakening its mechanical properties when working on the slice, or the increase of metal.

Use the carbide tip cutting tool according to the present invention will increase the life and durability of the tool by improving the operational characteristics of the tip aimed at increasing the strength of the design, and also facilitates the automation process of the soldering tip and the tool body.

1. Carbide tipped rotary cutting tool containing cutting, cylindrical flange and the supporting part, on the conical surface of which the last made group of projections of the same height, evenly spaced on a circle of diameter d1, characterized in that the bevel on the located on a circle of diameter d2and the cylindrical surface of the flange portion of the tip is provided with evenly spaced around the circumference of the centering elements have the same height, with the tabs around the circumference of diameter d2shifted in the circumferential direction relative to the tabs, located on a circle of diameter d1which in turn shifted in the circumferential direction relative to the centering elements.

2. The carbide tip under item 1, characterized in that the ratio of diameters of circles d1for d2where there are groups of protrusions, is 1.3 to 1.5.

 

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