BG667Y1 - Milling machine with vibration damping - Google Patents

Abstract

The milling machine has a body (1) and teeth (2), fitted along its periphery. In the body (1) there are at least two passage cylindrical holes (3) which are positioned symmetrically and opposite the milling machine axis and are coaxial to it. Holes (3) are closed by caps (4) and are inside filled by viscous material (5) of specified density, viscosity and quantity of shots (6) of specified mass and density. In the place of the shots (6) in the holes cylindrical bodies (7) are placed with an axis which is coaxial to the axis of the holes (3). Bodies (7) have exactly determined diameter, smaller than that of holes (3), and have higher density than the density of the body (1). They are formed as bimetal structure, including an external tubular detail (8) made of tempered material which inside is filled by another material (9) of higher density and its of damping, such as a lead or another alloy. 2 claims, 2 figures

Description

(54) EXCAVATOR MILL

Technical field

The utility model refers to a milling cutter designed to cut through surfaces and grooves on parts of metal, wood, plastics and more.

BACKGROUND OF THE INVENTION

The construction of the cutter / 1 / is known, the housing of which consists of two rotary parts. One part is shaped on one side as the milling tail, and on the other as a cylindrical mandrel. On the mandrel of the first workpiece is a second rotary workpiece bearing the cutting teeth of the cutter. The two rotary parts are based both on the cylindrical surfaces of the hole and mandrel, as well as on the front surfaces. In one rotary workpiece, a number of cylindrical-step, collinear shaped axes of the milling cutter are formed. The bushings are provided with elastic bushings, which are pressed by washers and bolts, which in turn are secured to the second rotary part by spring washers and nuts. In the known milling design, the presence of an elastic connection between the two rotary parts is used to achieve a damping effect against the vibrations of the cutting by the chip formation.

The milling cutter has a relatively low vibration damping ability, since the relative circular reversible displacements between the two rotating parts are severely limited by the friction force between their support faces caused by the axial compression force generated by the bolts. In addition, in order to achieve an elastic angular reversal between the two rotary parts, it is necessary to realize a joint with a gap between them along the connecting hole, which impairs the tool's properties with respect to its radial beating. The design of the milling machine cannot compensate for the presence of radial beating caused by the gap in the cylindrical assembly.

The technical nature of the utility model

The purpose of the utility model is to provide a milling cutter with increased damping properties, while also compensating for the available adjusting radial and axial beating.

The task is solved by creating a milling cutter including a body and teeth located on the periphery of the body. The body has at least two cylindrical openings arranged symmetrically and opposite to the axis of the mill. The openings are closed with caps and are filled with viscous material of a certain density and viscosity and with shotguns.

In another embodiment, cylindrical bodies of bimetallic construction with a higher density relative to the density of the mill body and with a diameter smaller than the diameter of the openings may be located in the openings. The cylindrical bodies are shaped like a bimetallic structure, including an outer tubular part made of hardened material, tightly filled inside with high density material and self-damping, such as lead or similar alloy.

The main advantage of the utility model is that the milling cutter with openings in its body, which has freely filled pellets or cylindrical bodies with increased density relative to the density of the milling body, together with a viscous material with a certain density and viscosity, achieves in a considerable degree of better damping of the vibrations that accompany the milling process. This is possible as a result of the free and dephased movement of the balls or the cylindrical bodies in the opposite direction to the inertial force arising from the irregularity of the milling process. On the other hand, the damping effect is also caused by the loss of energy resulting from the hits that the shotguns perform with each other, as well as the impact of the shotguns, respectively of the cylindrical bodies, into the walls of the openings. Another advantage of the utility model is that the free movement of the balls or cylindrical bodies in the openings allows to compensate for the imbalance of cutting force caused by the available radial and axial thrust of the tool.

Explanation of the annexed figures

An exemplary embodiment of the utility model is shown in the accompanying figures, of which:

a model where there are shotguns in the openings; Figure 2 - the solution with free cylindrical bimetal bodies.

Examples of implementation of the utility model

The mill has a body 1 and teeth 2 located on the periphery of the body 1, with at least two cylindrical openings 3 in the body 1 arranged symmetrically and opposite to the axis of the mill and coaxially closed with caps 4, which openings 3 are filled with viscous material 5 of specified density and viscosity and with ball 6.

In another embodiment of the milling cutter, cylindrical bodies 7 having an increased density relative to the density of the milling body 1 and a diameter smaller than the diameter of the openings 3 may be disposed in the open state 3. The cylindrical bodies 7 with increased density relative to the density of the milling body 1, they are shaped as a bimetallic structure comprising an outer tubular member 8 of a hardened material, tightly filled internally with a material of increased density and self-damping, such as lead or similar alloy.

Using the utility model

According to the type of milled material and the quality requirements of the machined surface, a milling cutter with appropriate structural and geometric elements is selected: diameter, number of teeth, type of tool material, cutting angles and elements of the machining mode. Depending on the choice made, the openings 3 are filled with a certain amount of viscous material 5 and freely bulk pellets 6 of a certain mass and density, or instead of the pellets 6, cylinders 10 of the increased density 7 are placed. The caps are then mounted 4. The cutter is then secured to the machine spindle and cut on the workpiece, whereby the vibrations obtained are of reduced amplitude and the quality of the machined surface is higher.

Claims (2)

Claims A mill comprising a body and teeth arranged at the periphery of the body, characterized in that at least two cylindrical openings (3) arranged symmetrically and opposite to the axis of the mill, closed by caps, are formed in the body (1). (4) which openings (3) are filled with viscous material (5) of a certain density and viscosity and with ball (6). 2. Milling machine comprising a body and teeth arranged at the periphery of the body, characterized in that at least two cylindrical openings (3) arranged symmetrically and opposite to the axis of the milling device, closed by caps, are formed in the body (1). (4) which openings (3) are filled with viscous material (5) of specified density and viscosity and with cylindrical bodies (7) with increased density relative to the density of the mill (1) of the mill and with a diameter smaller than the diameter of the openings (3), the cylindrical bodies (7) being shaped as a bimetallic structure including ene tubular part (8) of hardened material, tightly packed inside with a material (9) with increased density and self damping, such as lead or other similar alloy. Attachment: 2 figures Literature 1. SU 1202752 A. Publication of the Patent Office of the Republic of Bulgaria 1113 Sofia, Blvd Dr. GM, Dimitrov 52-B Expert: R. Ashikyan Editor: V. Altavanov Cf. № 42271 Circulation: 40 VN