RU2094181C1 - Assembled disk milling cutter - Google Patents

Abstract

FIELD: machining. SUBSTANCE: assembled milling cutter has housing that consists of three portions, central and two side portions, and teeth mounted on the central portion of the housing by slots and secured with the use of fastening members passing through the openings in the walls of the teeth on both sides of the slot and openings in the central portion of the housing of the milling cutter. The side portions of the housing of the milling cutter that underlies the end face surface of the teeth are smaller in diameter than the central portion. Each tooth of the milling cutter has rear projection with two supporting surfaces for interaction with the side portions of the housing. A distance between these surfaces and end face surface of a tooth is less than a difference between the radius of the central portion of the housing and radii of the side portions passing through the openings for fastening members. EFFECT: improved design. 2 cl, 4 dwg

Description

 The invention relates to the field of materials by cutting, in particular, to disk cutters with inserted teeth.

 Known prefabricated disk mill with insertion teeth (ed. St. N 676448, B 27 B 33/12 contains a housing with incisal bases and insertion teeth with a slot formed by the cheeks.

 Fastening of the cutters on the cutter body is carried out by landing the teeth on the cutting base with further clogging of the teeth with the help of impacts. In this case, the wedge sections of the incisal base move apart the cheeks of the incisors and the incisor moves along the incisal base until the protrusions located on the cheeks of the incisors enter the grooves of the incisal base.

 The disadvantage of this design is the low reliability of fixing, due to the fact that even small gaps between the protrusions on the cheeks of the teeth and the walls of the grooves during operation will lead to the destruction of the grooves under the influence of vibrations and shock loads.

 Known prefabricated disk mill (GOST 4047-82) contains a housing with a central part and two side parts of smaller diameter, as well as insert teeth with slots, the length of which is greater than the difference between the radius of the Central part of the mill body.

 The teeth are fixed on the cutter body by fitting the teeth with a slot on the protruding central part of the cutter until the teeth stop on the surface of the side parts of the cutter body, and then fix them with rivets.

 The disadvantage of this prefabricated disk cutter is the low reliability of tooth fastening, due to the fact that the parts of the teeth made on both sides of the slot must abut against the side parts of the cutter body, and due to manufacturing errors one of the tooth parts will not reach the surface of the side part of the cutter body , which as a result will lead to a weakening of the tooth attachment.

 In addition, during the operation of the cutter, the tooth does not have direct support on the cutter body and under the influence of the tangential component of the cutting force, the fastening elements will loosen, by means of which the teeth are supported on the body in the tangential direction.

 Known prefabricated disk mill (German patent N 2743304, B 23 D 61/06), selected for the prototype contains a housing consisting of three parts - the Central and two side, and teeth, mounted by slots on the Central part of the housing and secured with fasteners, passing through openings in the walls of the teeth on both sides of the slot and through openings in the central part of the cutter body. The side parts of the mill body located under the end surface of the teeth have a diameter smaller than the diameter of the central part, and between adjacent holes for fasteners on the central part of the body, the thickness of the latter is equal to the sum of the thicknesses of the central and both side parts.

 The teeth are fixed on the cutter body by installing the teeth with a slot on the central part of the cutter body and finally fixing them with fasteners.

 The design flaw of the prefabricated disk cutter (German patent N 2743304) is the low accuracy of the tooth base on the cutter body in the radial direction, since it is based on different, non-conjugated surfaces that cannot be made in one case installation or in one tool installation forming surface data. This significantly reduces the accuracy of the radial arrangement of the cutting edges of the teeth and leads to the need for additional sharpening of the teeth after installing them on the body of the cutter. It is well known that, as a rule, processing in one installation is much more accurate and less expensive than other operations.

 In the proposed prefabricated disk milling cutter comprising a housing consisting of three parts of the central and two lateral, and teeth mounted by slots on the central part of the housing and secured with fasteners passing through holes in the central part of the mill body, while the side parts of the mill body located under the end surface of the teeth, have a diameter less than the diameter of the Central part, while between adjacent holes for fasteners on the Central part of the housing, the thickness of the latter is equal to the sum of the thicknesses in the central and two lateral parts, on each cutter tooth there is a rear protrusion with two abutment surfaces designed to interact with the lateral parts of the body, and the distance between the abutment surfaces of the tooth and the end surface of the latter is made smaller than the difference between the radius of the central part of the body and the radii of the side parts passing through the holes for the fasteners, in addition, on the side parts of the housing there is a thrust surface located flush with the central part th corps.

 In FIG. 1 shows a prefabricated disk mill, general view; in FIG. 2 - housing precast disk cutter; in FIG. 3 false tooth; in FIG. 4 embodiment of the cutter body.

 The prefabricated disk mill (Fig. 1) contains a housing with a central part 1 and two side parts 2 and 3.

 On the central part 1 of the housing, holes 4 are made for fasteners 5.

 Between adjacent holes 4, the mill body thickness is equal to the sum of the thicknesses of parts 1, 2 and 3. This can be achieved either by making the outer diameter of the side parts 2 and 3 equal to the outer diameter of the central part 1 (Fig. 1), or by making the outer diameter of the side parts 2 and 3 smaller than the outer diameter of the Central part 1 and connecting to it on both sides between adjacent holes 4, for example, by soldering or welding, additional plates 6 (Fig. 4).

 Insertion teeth 7 (Fig. 3) are placed in the cutter body, having a slot 8 formed by the cheeks 9. On the cheeks 9 holes 10 are made for fasteners 5. Each tooth has a rear protrusion 11 with two abutment surfaces 12 and 13. The distance between the abutment surfaces 12 and 13 and the end surfaces of the cheeks 9 are smaller than the radius of part 1 and the radius of the side parts 2 and 3 passing through the holes 4.

 Assembly of the cutter is as follows.

 The insertion teeth 7 are installed by the slot 8 on the central part 1 of the mill body until the contacting of the abutment surfaces 12 and 13 of the rear projection 11 with the abutment surface of the side parts 2 and 3 of the mill body, and the end surfaces 14 of the cheeks 9 do not reach the side parts 2 and 3. Cheeks 9 are located between the extensions of parts 2 and 3 of the cutter body (Fig. 1) or between patch plates 6 (Fig. 4). Holes 10 of the cheeks 9 are combined with holes 4 on part 1 of the mill body. Fasteners 5 are inserted into them, made, for example, in the form of rivets, and are tightened (riveted).

Claims (2)

 1. A prefabricated disk cutter comprising a housing consisting of three parts - a central and two lateral, and teeth mounted with slots on the central part of the housing and secured with fasteners passing through holes in the teeth walls on both sides of the slot and through holes in the central parts of the mill body, while the side parts of the mill body located under the end surface of the teeth have a diameter smaller than the diameter of the central part, while between adjacent holes for fasteners on the central part Part of the body, the thickness of the latter is equal to the sum of the thicknesses of the central and two side parts, characterized in that on each cutter tooth there is a rear protrusion with two abutment surfaces intended to interact with the side parts of the body, the distance between said abutment surfaces of the tooth and the end surface of the latter being made smaller the difference between the radius of the central part of the body and the radii of the side parts passing through the holes for the fasteners.  2. The milling cutter according to claim 1, characterized in that on the lateral parts of the housing there is a thrust surface located flush with the central part of the housing.

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