CN115464194A - An asymmetric damping conical ball end milling cutter for titanium alloy blade milling - Google Patents

Abstract

The invention relates to an asymmetric damping conical ball end milling cutter for titanium alloy blade milling, which relates to the field of milling cutters. The asymmetric damping conical ball-end milling cutter for titanium alloy blade milling includes a shank part, a helical cutting part, a ball-end cutting part and an internal cooling part arranged in sequence, and the ball-end cutting part includes at least one pair of circumferentially spaced The main cutting edge is symmetrically arranged. The two sides of the main cutting edge are respectively provided with chip removal grooves and tool nose clearance. The side of the main cutting edge facing the tool nose clearance has a first flank; the spiral cutting part includes a A pair of connected spiral grooves and the first flank of the peripheral edge correspondingly connected with the first flank; the inner cooling part includes an inner cooling hole corresponding to the main cutting edge one by one, and one end of the inner cooling hole runs through the handle Part of the end face, the other end runs through the spiral groove and its corresponding flute. Titanium alloy blade milling uses asymmetric vibration-damping conical ball-end milling cutters to reduce vibration and enable coolant to enter the cutting area efficiently to reduce the temperature of the cutting area.

Description

Asymmetric damping conical ball end milling cutter for titanium alloy blade milling

technical field

The present application relates to the field of milling cutters, in particular to an asymmetric damping conical ball end milling cutter for milling titanium alloy blades.

Background technique

As an ideal aerospace material, titanium alloy is widely used in the field of aeroengine blades. Titanium alloy has excellent material properties but its processing problems also come with it. The specific strength of titanium alloy is the highest among modern engineering structural metal materials. It is suitable for the manufacture of aircraft parts and can improve the flight performance of the aircraft. It has the advantages of good heat resistance and high thermal strength. Its working temperature can reach 500 ℃, at 300-500℃, the strength of titanium alloy is 10 times higher than that of aluminum alloy, and the corrosion resistance of titanium alloy is good, but the corrosion resistance of titanium to media with reducing oxygen and chromium salt is poor; the elastic modulus of titanium alloy Small titanium alloys are prone to elastic deformation. It is not easy to make slender rods and thin-walled parts.

Due to the characteristics of small elastic modulus, low thermal conductivity and low deformation coefficient of titanium alloy, the wear of the tool is serious during the machining process, and the surface quality of the workpiece after machining is poor. In the process of machining aeroengine blades, the processing efficiency of titanium alloy machining tools is low, and the consumption is large. It is necessary to reserve a large amount of the tools for backup, resulting in high cost and unable to meet the processing requirements.

Contents of the invention

The purpose of this application is to provide an asymmetric damping conical ball end milling cutter for titanium alloy blade milling, which reduces the vibration and the possibility of cutting edge damage and chipping, and enables the coolant to enter the cutting efficiently area to reduce the temperature in the cutting area.

The embodiment of the application is realized like this:

The present application provides an asymmetric damping conical ball end milling cutter for titanium alloy blade milling, which includes a handle part, a helical cutting part arranged at the end of the shank part and a ball end cutting part arranged at the end of the helical cutting part The part and the internal cooling part, the ball head cutting part includes at least one pair of main cutting edges arranged asymmetrically along the circumferential interval, the two sides of the main cutting edge are respectively provided with chip removal groove and tool nose clearance, and the main cutting edge faces the tool nose clearance There is a first flank on one side; the helical cutting part includes a helical flute that communicates with the chip flute in one-to-one correspondence and a first flank of the peripheral edge that connects with the first relief surface in a one-to-one correspondence; the internal cooling part includes a The main cutting edge corresponds to the internal cooling hole one by one, one end of the internal cooling hole penetrates the end face of the tool holder part, and the other end penetrates the spiral groove and its corresponding chip removal groove.

In some optional embodiments, the rake angles on one side of the flutes of each pair of main cutting edges are 8-15° and 0-5° respectively.

In some optional embodiments, the clearance angles of the first relief surface of each pair of main cutting edges are 6-10° and 10-15° respectively.

In some optional embodiments, the blunt fillet radius of the main cutting edge is 0.02-0.05 mm.

In some optional embodiments, the included angle between the end tangent of the inner cooling hole at the helical cutting part and the axis of the shank part is 10-15°.

In some alternative embodiments, the helical cutting portion is conical and has a cone angle of 2-4°.

In some optional embodiments, the separation angle between each pair of main cutting edges is 173-178°.

The beneficial effects of the present application are: the asymmetric damping conical ball end milling cutter provided by the present application for milling titanium alloy blades includes a handle part, a helical cutting part arranged at the end of the handle part, and a helical cutting part arranged at the end of the helical cutting part. The ball head cutting part and internal cooling part, the ball head cutting part includes at least a pair of main cutting edges arranged asymmetrically along the circumferential interval, the two sides of the main cutting edge are respectively provided with chip removal groove and tool nose clearance, the main cutting edge The side facing the tool nose gap has a first flank; the helical cutting part includes a spiral flute that communicates with the flute in one-to-one correspondence and a first flank of the peripheral edge that connects with the first flank in a one-to-one correspondence; the inner The cold part includes internal cooling holes corresponding to the main cutting edge one by one. One end of the internal cooling hole runs through the end face of the tool handle part, and the other end runs through the spiral groove and its corresponding chip removal groove. The asymmetric shock-absorbing conical ball end milling cutter provided by this application for milling titanium alloy blades breaks the vibration frequency of the conventional symmetrical cutting edge design, thereby reducing vibration and reducing the possibility of cutting edge breakage and chipping, and through the inner cooling hole While ensuring the rigidity of the milling cutter, the coolant can efficiently enter the cutting area to reduce the temperature of the cutting area, thereby achieving the effect of improving tool life and surface accuracy.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, so It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is a structural schematic diagram of a first viewing angle of an asymmetric damping conical ball end milling cutter for titanium alloy blade milling provided by an embodiment of the present application;

Fig. 2 is a structural schematic diagram of a second viewing angle of an asymmetric damping conical ball end milling cutter for milling a titanium alloy blade provided by an embodiment of the present application;

Fig. 3 is a structural schematic diagram of a third viewing angle of an asymmetric vibration-damping conical ball-end milling cutter for titanium alloy blade milling provided by an embodiment of the present application;

Fig. 4 is a structural schematic diagram of the rake angle and relief angle of a cross-section of a main cutting edge of an asymmetric damping conical ball end milling cutter for titanium alloy blade milling provided by the embodiment of the present application;

Fig. 5 is a structural schematic diagram of the rake angle and relief angle of the cross-section of another main cutting edge of the asymmetric vibration-damping conical ball end milling cutter provided by the embodiment of the present application;

Fig. 6 is a structural schematic diagram of the angle between the end tangent of the helical cutting part and the axis of the handle part of the internal cooling hole of the asymmetric damping conical ball end milling cutter for titanium alloy blade milling provided by the embodiment of the present application;

Fig. 7 is a schematic diagram of the equation of the main cutting edge profile of the asymmetric damping conical ball end milling cutter for titanium alloy blade milling provided by the embodiment of the present application.

In the figure: 100, the handle part; 110, the spiral cutting part; 111, the spiral groove; 112, the first flank of the peripheral edge; 120, the ball cutting part; 121, the main cutting edge; 122, the flute; 123 , Tool tip clearance; 124, the first flank; 130, internal cooling hole.

detailed description

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, not all of them. The components of the embodiments of the application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the application product is used, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the application. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of this application, it should also be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

In this application, unless otherwise expressly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

The characteristics and performance of the asymmetric vibration-damping conical ball end milling cutter for milling titanium alloy blades of the present application will be further described in detail below in conjunction with the examples.

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, the embodiment of the present application provides an asymmetric damping conical ball end milling cutter for titanium alloy blade milling, which includes sequentially connected cutters The shank part 100, the spiral cutting part 110 and the ball cutting part 120, the ball head diameter of the ball cutting part 120 is 2.003 mm, the ball cutting part 120 includes a pair of main cutting edges 121 arranged asymmetrically along the circumferential interval, the two The interval angle along the circumferential direction between two main cutting edges 121 is 174 °, and the two sides of main cutting edge 121 are respectively provided with flute 122 and tool nose clearance 123, and the side of main cutting edge 121 towards tool nose clearance 123 has The first flank 124; the two main cutting edges 121 in each pair of main cutting edges 121 are respectively the main cutting edge a and the main cutting edge b, and the front edge of the chip flute 122 side of the main cutting edge a and the main cutting edge b The angles α are 10° and 3°, respectively, and the relief angles β on the first flank 124 side of the main cutting edge a and the main cutting edge b are 8° and 12°, respectively. The length of the main cutting edge 121 is 1.1mm, and the blunt fillet radius of the main cutting edge 121 is in the range of 0.02-0.05mm. The helical cutting part is conical with a taper angle of 3°. The helical cutting part 110 includes a helical flute 111 that communicates with the flute 122 in one-to-one correspondence and a peripheral edge first relief that is connected with the first relief surface 124 in a one-to-one correspondence. Surface 112; the asymmetric vibration-damping conical ball end milling cutter for titanium alloy blade milling also includes an inner cooling part, and the inner cooling part includes two inner cooling holes 130 corresponding to the main cutting edge 121 one by one, and one end of the inner cooling hole 130 It runs through the end face of the handle part 100 away from the helical cutting part 110, and the other end runs through the joint of the helical groove 111 and its corresponding flute 122; The included angle is 15°.

The asymmetric vibration-damping conical ball end milling cutter for milling titanium alloy blades provided in the embodiment of the present application adopts an asymmetric main cutting edge 121 design, which can break the vibration frequency of the conventional symmetrical main cutting edge 121 design, thereby reducing vibration The purpose is to reduce the possibility of the main cutting edge 121 being damaged and chipped. By adopting rake angles of 8-15° and 0-5° on one side of the chip flute 122 of each pair of main cutting edges 121, respectively, the first relief surface 124 of each pair of main cutting edges 121 is adopted as 6-10° ° and 10-15 ° relief angle design, can increase the contact area between the tool and the chip while reducing the cutting force, so that the temperature of the cutting area of the tool is reduced, which will lead to The center of mass deviates from the axis of rotation of the tool, and the two main cutting edges 121 are individually designed with a rake angle and a relief angle to correct the center of mass of the tool so that it is at the center of rotation;

Wherein, by setting the internal cooling hole 130 whose two ends respectively pass through the shank part 100, the spiral groove 111 and the corresponding chip flute 122, the high-pressure coolant ejected from the internal cooling hole 130 can directly reach the cutting area of the tool, effectively reducing the The cutting temperature of the tool slows down the tool wear process. The inner cooling hole 130 is at an angle of 15° between the tangent line at the end of the helical cutting part 110 and the axis of the tool handle part 100, which can ensure that the coolant in the inner cooling hole 130 cools the cutting area while avoiding deviation and disadvantages to the center of mass of the tool. influences.

The principle of dynamic balance of the asymmetric vibration-damping conical ball end milling cutter provided in the embodiment of the present application for milling titanium alloy blades is:

Establish a rectangular coordinate system so that the Z axis of the coordinate system coincides with the central axis of the asymmetric damping conical ball end milling cutter for titanium alloy blade milling, as shown in Figure 7, in this coordinate system The equations are f ₁ (x) and f ₂ (x), respectively.

According to the length H of the main cutting edge 121 of the milling cutter, the total length 1 of the asymmetric damping conical ball end milling cutter for titanium alloy blade milling, the helix angle β, the material density ρ, and the outer circle radius R of the helical cutting part 110 of the milling cutter , the tooth pitch difference angle θ is brought into the equation of the inner and outer contours of the main cutting edge 121, the outer contour f ₁ (x) is determined according to the rake face angle of the main cutting edge 121, and the milling cutter imbalance U of the standard milling cutter is obtained by substituting the following formula The relationship between the centroid coordinates (x ₁ , y ₁ ) and the radial cross-sectional area S of the main cutting edge 121:

The radial cross-sectional area S of the main cutting edge 121 and the centroid coordinates (x ₁ , y ₁ ) are calculated as follows:

s=∫(f ₂ (x)-f ₁ (x))dx

According to the calculation process of the rake angle and relief angle parameters of the main cutting edge a and main cutting edge b above: the first step is to use the average unbalance amount of several (3-5) standard milling cutters detected by the dynamic balance measuring instrument U is the standard. The second step selects the tooth pitch difference angle θ and the length H of the designed main cutting edge 121 in the optimal range, the total length of the milling cutter is 1, the helix angle β, the material density is ρ, and the radius R of the outer circle of the helical cutting part 110 of the milling cutter, The outer profile f ₁ (x) of the main cutting edge 121 is determined according to the outer angle of the main cutting edge 121 . The third step is to reversely calculate the inner profile f ₂ (x) of the main cutting edge 121 from the above formula. The fourth step is to differentiate the inner profile f ₂ (x) of the main cutting edge 121 to obtain the inner angle of the main cutting edge 121 .

The embodiments described above are some of the embodiments of the present application, but not all of them. The detailed description of the embodiments of the application is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

Claims (7)

1. An asymmetric damping conical ball end milling cutter for titanium alloy blade milling, which comprises a handle part, a helical cutting part that is located at the end of the handle part and a helical cutting part that is located at the end of the helical cutting part The ball head cutting part and the internal cooling part are characterized in that the ball head cutting part includes at least a pair of main cutting edges arranged asymmetrically along the circumferential interval, and the two sides of the main cutting edges are respectively provided with chip removal grooves and Tool nose clearance, the main cutting edge has a first relief surface on the side facing the tool nose clearance; the helical cutting part includes a helical flute that communicates with the chip removal flute in one-to-one correspondence and communicates with the first The flanks correspond to the first flank of the peripheral edge connected one by one; the internal cooling part includes internal cooling holes corresponding to the main cutting edge one by one, and one end of the internal cooling hole runs through the end surface of the handle part , and the other end runs through the spiral groove and its corresponding chip removal groove. 2. The asymmetric damping conical ball end milling cutter for titanium alloy blade milling according to claim 1, wherein the rake angles on one side of the chip flute of each pair of main cutting edges are respectively 8 -15° and 0-5°. 3. The asymmetric damping conical ball end milling cutter for titanium alloy blade milling according to claim 1, wherein the clearance angles on one side of the first flank of each pair of main cutting edges are respectively for 6-10° and 10-15°. 4. The asymmetric damping conical ball end milling cutter for titanium alloy blade milling according to claim 1, characterized in that, the passivation fillet radius of the main cutting edge is 0.02-0.05mm. 5. The asymmetric damping conical ball end milling cutter for titanium alloy blade milling according to claim 1, characterized in that, the internal cooling hole is at the end tangent of the spiral cutting part and the shank part The angle between the axes is 10-15°. 6. The asymmetric damping conical ball end milling cutter for titanium alloy blade milling according to claim 1, characterized in that, the helical cutting part is conical and the cone angle is 2-4°. 7. The asymmetric damping conical ball end milling cutter for titanium alloy blade milling according to claim 1, characterized in that, the interval angle between each pair of said main cutting edges is 173-178°.

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