CN202639467U

CN202639467U - Novel face milling cutter handle with adjustable dynamic property

Info

Publication number: CN202639467U
Application number: CN2012201802256U
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-04-25
Filing date: 2012-04-25
Publication date: 2013-01-02
Anticipated expiration: 2022-04-25

Abstract

The utility model relates to a novel face milling cutter handle with an adjustable dynamic property. The novel face milling cutter handle comprises a main shaft connector portion, an adjustable handle body portion and a cutter connector portion. An HSK connector mode can be adopted on a cutter handle connector portion. Thread connection is adopted on the cutter connector portion. The adjustable handle body portion comprises a handle body main body, circular ring bodies and an inner hexagon screw. In order to enable the adjusting range of the dynamic property of the face milling cutter handle to be as large as possible, a matched area can be equally divided into an upper portion, a middle portion and a lower portion according to the length of the handle body main body. The form specifications of the circular ring bodies include a big circular ring body, a medium circular ring body and a small circular ring body. Materials with two different densities are chosen as the materials of the circular ring bodies. According to the novel face milling cutter handle, the dynamic property can be changed through adjustment of the structure of the face milling cutter handle, and accordingly the dynamic property of a cutter tip position is optimized, a required stable cutting limit picture is acquired, meanwhile forced vibration caused by intermittent cutting is avoided, cutting conditions are needless to be changed, and especially on the condition that a selection range of cutting parameters is small, the novel face milling cutter handle is an effective vibration-reduction and vibration-avoidance method.

Description

Novel movable step response surface adjustable milling cutter shank

Technical field

The utility model relates to a kind of handle of a knife, especially a kind of Novel movable step response surface adjustable milling cutter shank.

Background technology

Cutting vibration is phenomenon common in the cutting process, and its impact on machining quality, cutter life is very unfavorable.Common oscillatory type has forced vibration and self-excited vibration.Self-excited vibration mainly is divided into regenerative self-excited vibration, friction-type self-excited vibration and modal coupling self-excited vibration.In milling process, because forced resonance and regenerative self-excited vibration that interrupted cut causes often occur.When cutting vibration occurring, often avoid the generation vibrated by changing cutting parameter, so often can sacrifice working (machining) efficiency.Also have a lot of researchers studied Suppression of Chatter in Metal Cutting with Varying Spindle Speed, online adjust cutting-tool angle, adopt the mechanism of the mode oscillation damping methods such as equidistant cutter tooth not, but these modes have certain limitation.Tooling system is participated in cutting directly, its dynamic characteristic has a direct impact cutting process, when the interrupted cut cutter tooth equals the intrinsic frequency at cutter place by frequency or its frequency multiplication forced resonance will occur, the stable cutting limit figure that is used for simultaneously Optimizing Cutting Conditions also has direct relation with the dynamic characteristic at point of a knife place.Owing to being subject to the restriction of the factors such as lathe, cutter, workpiece, working (machining) efficiency, the mobility scale of cutting parameter is limited, therefore by regulating the dynamic property optimum cutting stability limiting figure of tooling system, avoiding simultaneously interrupted cut frequency and frequency multiplication thereof will be a kind of simple and practical vibration damping anti-vibration method.

Handle of a knife is as the transition of lathe and cutter, and its dynamic characteristic is to the dynamic characteristic important at point of a knife place, and the handle of a knife major part all is monoblock type at present, and is adjustable fewer.

The utility model content

In order to overcome the deficiency of above-mentioned existing product, the purpose of this utility model is to provide a kind of Novel movable step response surface adjustable milling cutter shank, be used for avoiding to greatest extent because the forced resonance that causes of interrupted cut, and optimize simultaneously and stablize cutting limit figure curve, obtain the material-removal rate of maximum.

In order to realize that the technical scheme that the purpose of this utility model adopts is: a kind of Novel movable step response surface adjustable milling cutter shank comprises main shaft interface section, adjustable handle body part and face milling cutters interface section.Wherein adjustable handle body part is comprised of main body and additional torus, by being connected, fixed by soket head cap screw, be processed with the plane on the handle body main body, make things convenient for screw reliably locked, the Mass Distribution of the dynamic characteristic of structure (intrinsic frequency, modal stiffness, modal damping, modal mass etc.) and structure, rigidity etc. have relation.Handle body main part can guarantee that handle of a knife has enough rigidity, torus is used for regulating the dynamic characteristic of handle of a knife, in order to regulate to greatest extent the dynamic characteristic of handle of a knife, torus is designed with large, medium and small three kinds of specifications, and material has two kinds of 45 steel (density) and hard straight alloys (density).Be upper, middle and lower three parts according to mating area handle status, three section axial equal in length all can be connected with torus with appointing.

The utility model mounting or dismounting are convenient, when adjusting structure, only need cutterhead is unloaded, and handle of a knife need not be unloaded down from lathe, thereby can be eliminated because the mismachining tolerance that the handle of a knife resetting brings.Adjustable handle body partly can be used on the handle of a knife of arbitrary form main shaft interface and face milling cutters cutterhead interface shape.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is further described.

Fig. 1 is the utility model structure chart

Fig. 2 is the utility model cutaway view

Fig. 3 is the torus front view

Fig. 4 is for optimizing limit of stability figure schematic diagram

1-main shaft interface section, 2-top handle body, 3-middle part handle body, 4-bottom handle body 5-torus, 6-cutterhead interface section among the figure.

The specific embodiment

In Fig. 1, Fig. 2, Fig. 3, the first embodiment shown in Figure 4, a kind of Novel movable step response surface adjustable milling cutter shank is characterized in that: comprise main shaft interface section, adjustable handle body part and face milling cutters interface section.Wherein adjustable handle body part is comprised of main body and additional torus, by being connected, fixed by soket head cap screw, be processed with the plane on the handle body main body, make things convenient for screw reliably locked, the Mass Distribution of the dynamic characteristic of structure (intrinsic frequency, modal stiffness, modal damping, modal mass etc.) and structure, rigidity etc. have relation.Handle body main part can guarantee that handle of a knife has enough rigidity, torus is used for regulating the dynamic characteristic of handle of a knife, in order to regulate to greatest extent the dynamic characteristic of handle of a knife, torus is designed with large, medium and small three kinds of specifications, and material has two kinds of 45 steel (density) and hard straight alloys (density).Be upper, middle and lower three parts according to mating area handle status, three section axial equal in length all can be connected with torus with appointing.

In Fig. 1, Fig. 2, the second embodiment shown in Figure 3, described torus maximum outside diameter has large, medium and small three kinds of specifications, be respectively 70mm, 90mm, 110mm, every kind of specification all adopts the material of two kinds of density, be respectively 45 steel, carbide alloy, can be connected with handle body bottom, top handle body middle part handle body, and be fixed together by screw, single torus can be fixed on and appoint with it the oen section of handle, also can the semi-circular ring that two or three are multi-form be fixed on the handle body main body.Described handle body axial length equates, all can be connected with torus, all is processed with the plane in handle body main body and torus cooperation place, makes screw that torus is reliably fixing.

In described the 3rd embodiment of Fig. 4, the intrinsic frequency at point of a knife place, modal stiffness, modal damping all have a direct impact the cutting stability limit curve.The Mass Distribution of structure and rigidity thereof have a direct impact the dynamic characteristic of structure, so the design of the utility model handle of a knife is feasible in theory.Can utilize finite element modal analysis or hammering experiment to obtain the dynamic characteristic of handle of a knife under the different conditions.Just can obtain the plurality of stable limiting figure for given machine processing system, restriction according to factors such as lathe, blade material, workpiece materials, determine best cutting speed scope, by the additional different torus at different handle body positions, change the dynamic characteristic at point of a knife place, thereby optimize limit of stability figure, so that the larger stable cutting axis of optimized cutting process velocity correspondence especially obtains the resection rate of high metal to cutting-in when heavy cut or roughing.

When using the utility model, especially when fine finishining, chipping allowance is very little, and the probability that regenerative self-excited vibration occurs is very little, at this moment because the forced vibration that interrupted cut causes is the principal element that affects crudy.The mechanism of the forced vibration that is caused by interrupted cut: when the intrinsic frequency of the frequency of interrupted cut and frequency multiplication thereof and cutter or workpiece is consistent, will cause fierce forced resonance.

The computing formula of interrupted cut frequency:

f= knz/60 （k=1、2、3…..）（1）

The n-speed of mainshaft z face milling cutters number of teeth in the formula.

Cutter tooth number is given regularly face to face, and the interrupted cut frequency just depends on the speed of mainshaft.Therefore, the selection of different cutting speeds will corresponding different interrupted cut frequencies.Calculate frequency and the frequency multiplication of interrupted cut by above-mentioned formula (1), obtain the intrinsic frequency at cutter place by mode test or semi analytical method, if frequency is consistent, it is the capable of regulating Knife handle structure, change the intrinsic frequency of cutter, thereby when interrupted cut, avoid because the forced resonance that the cutter factor causes.Especially in the situation that the speed of mainshaft is selected to be restricted, this selects the especially a kind of effective anti-vibration measure of this handle of a knife.

Claims

1. a Novel movable step response surface adjustable milling cutter shank is characterized in that: comprise main shaft interface section, adjustable handle body part and face milling cutters interface section; Wherein adjustable handle body part is comprised of main body and additional torus, by being connected, fixed by soket head cap screw, be processed with the plane on the handle body main body, make things convenient for screw reliably locked, handle body main part can guarantee that handle of a knife has enough rigidity, torus is used for regulating the dynamic characteristic of handle of a knife, in order to regulate to greatest extent the dynamic characteristic of handle of a knife, torus is designed with large, medium and small three kinds of specifications, and material has 45 steel and two kinds of hard straight alloys; Be upper, middle and lower three parts according to mating area handle status, three section axial equal in length all can be connected with torus with appointing.