CN106624099B - A kind of rectangular cutter blade of titanic alloy machining high intensity - Google Patents

Abstract

The invention discloses a high-strength square milling insert for titanium alloy processing, which belongs to the technical field of cutting tools. The invention solves the problems of low processing surface quality, serious tool wear and low processing efficiency when the existing milling inserts process the titanium alloy. The horizontal section shape of the milling insert is square, and the geometric center of the milling insert is provided with a threaded mounting hole for fixed connection with the tool holder along the thickness direction; The side is provided with a main cutting edge and a wiper edge, and the two main cutting edges and two wiper edges are symmetrically arranged relative to the geometric center of the milling insert, and there are two sets of conical protrusions on the rake face of the milling insert , two sets of conical protrusions are adjacent to the two main cutting edges. The flank surface of the milling insert including the main cutting edge is composed of the main cutting edge flank surface and the insert base flank from top to bottom. The insert base The flank is an inclined plane with the lower part inclined towards the inner side of the milling insert. The invention is used for milling titanium alloy workpieces.

Description

A kind of titanium alloy processing high-strength square milling insert

technical field

The invention relates to a milling insert, belonging to the technical field of cutting tools.

Background technique

Since the 20th century, the scale of aerospace engineering has been increasing, and the complexity of engineering technology has become higher and higher. In the process of accelerating the rapid development of aerospace, the technological innovation of engines has always been the core of aerospace development, mainly in high temperature and high pressure. , Working in a high-speed environment, and in order to meet the safety performance requirements of the relevant parts, according to industry standards, the accuracy and performance of the relevant important parts must be guaranteed at the same time. At the same time, due to the low density, high thermal strength and durable strength of titanium alloy, low sensitivity to crack propagation under the action of vibration load and impact load, and good corrosion resistance, it is preferred to be used in engine and shell structures Titanium alloy material. However, when processing and manufacturing engines, titanium alloys have poor thermal conductivity, small elastic modulus, and large elastic deformation. The surface rebound of the workpiece near the flank is large, which is about 2 to 3 times that of stainless steel, resulting in poor surface quality. High and severe friction, adhesion and bond wear on the tool flank. In addition, due to the low plasticity and high hardness of the titanium alloy material, the shear angle increases, the contact length between the chip and the rake face is small, and the cutting force And cutting heat is concentrated near the cutting edge, and the blade is prone to damage, which affects the normal use of the tool.

Contents of the invention

The purpose of the present invention is to propose a high-strength square milling insert for titanium alloy processing to solve the problems of poor surface quality, serious tool wear and low processing efficiency when the existing milling insert is processing titanium alloy.

The milling insert of the present invention is mainly used in the titanium alloy milling stage. The insert is mainly aimed at the short contact length of the knife-chip during the cutting of the titanium alloy, poor thermal conductivity, and low density. The cutting force and cutting heat are concentrated near the cutting edge. The temperature in the zone is high, which makes the tool easy to chip and wear seriously. At the same time, the phenomenon of chilling and hardening is serious, which not only reduces the fatigue strength of the parts, but also aggravates the wear of the tool. Moreover, the elastic modulus is small, the elastic recovery is large, and the friction is serious. At the same time, the chemical affinity Large, serious bonding with Ti-containing cemented carbide, etc., a high-strength square milling insert designed for titanium alloy processing.

According to the properties of titanium alloys and the characteristics of the cutting process, the following aspects should be considered during processing: use cemented carbide tools as much as possible, such as tungsten-cobalt cemented carbide and titanium alloys have low chemical affinity, good thermal conductivity, and high strength. high. Smaller rake angle and larger relief angle are used to increase the contact length between the chip and the rake face, and minimize the friction between the flank face and the workpiece. If it is damaged, keep the blade sharp to ensure smooth chip removal and avoid chip sticking and chipping.

Realize above-mentioned object, the technical scheme that the present invention takes is as follows:

A high-strength square milling insert for titanium alloy processing, the milling insert is made of hard alloy material, the top surface area of the milling insert is larger than the bottom surface area, the horizontal cross-sectional shape of the milling insert is square, the milling insert The geometric center of the milling insert is provided with a threaded mounting hole along the thickness direction for fixed connection with the cutter bar; the milling insert is provided with two tool tips, and the two tool tips are arranged symmetrically with respect to the geometric center of the milling insert; One side of each tool nose is provided with a main cutting edge, and the other side of each tool nose is provided with a wiper edge, and the two said main cutting edges are arranged symmetrically with respect to the geometric center of the milling insert, and the two said The wiper edge of the milling insert is also set symmetrically with respect to the geometric center of the milling insert. There are two groups of conical protrusions with the same size parameters on the rake face of the milling insert. The cutting edges are arranged adjacent to each other, and each group of conical protrusions includes a plurality of conical protrusions, and the plurality of conical protrusions are arranged along the length direction of the main cutting edge. The surface is composed of the flank of the main cutting edge and the flank of the blade base from top to bottom, and the flank of the blade base is an inclined plane with the lower part inclined toward the inner side of the milling insert.

The beneficial effect of the present invention relative to prior art is:

1. This insert is a high-strength square milling insert for titanium alloy processing. It is designed with two main cutting edges and two wiper edges. Coating improves the hardness and wear resistance of the milling blade, relieves the wear of the blade, and improves the durability of the blade. The milling blade is fixedly installed on the tool holder through the threaded mounting hole.

2. According to the cutting processing characteristics of titanium alloy materials, the rake angle of the milling insert is 8°, the rear angle is 10°, the entering angle is 90°, and the edge angle is 5°. At the same time, the structure of the milling insert is symmetrical, and the machining low cost.

3. When the titanium alloy material is at a temperature above 600°C, an oxidized hard layer will form on the surface, which has a strong wear effect on the knife, and the poor thermal conductivity of the titanium alloy, as well as the serious chilling phenomenon, further aggravate the wear of the tool, so in order to slow down The milling insert is worn, and a V-shaped groove is formed between the front surface of the milling insert and the rake face, which is conducive to chip breaking and chip removal, thereby preventing the milling insert from wearing.

4. Due to the low plasticity and high hardness of titanium alloy materials, the shear angle increases, the contact length between the chips and the rake face is small, the cutting force and cutting heat are concentrated near the cutting edge, and the blade is prone to damage. Two groups of conical protrusions are designed on the surface to strengthen the strength of the milling blade, slow down the wear of the milling blade and reduce the cutting temperature.

5. When cutting and processing titanium alloy materials, due to the small elastic modulus and large elastic deformation of the material, the surface rebound of the workpiece near the flank is large, which is about 2 to 3 times that of stainless steel, resulting in low quality of the processed surface and The severe friction, adhesion and bond wear of the flank of the tool, so the design of the flank of the main cutting edge and the flank of the blade base are not on the same plane, which can improve the strength of the cutting edge and the quality of the machined surface. And because the milling insert with a wiper edge can improve the surface quality compared with ordinary milling inserts under the same feed conditions, so the design of the wiper edge for reprocessing can improve the surface quality of the workpiece and slow down the milling speed. Effect of blade wear. At the same time, the flank of the wiper edge and the avoidance surface are connected through an arc-shaped connection surface, which can ensure the quality of the machined surface and improve the vibration resistance of the milling insert.

6. According to the processing conditions of the tool, an annular heat dissipation groove is designed on the bottom surface of the milling insert to play a role in heat dissipation and relieve stress concentration during fastening. The milling insert has low processing cost, is safe and reliable, and can effectively improve work efficiency in milling processing.

In summary, a high-strength square milling insert for processing titanium alloys of the present invention is mainly to solve the problem that when cutting titanium alloys, due to the cutting characteristics of the processed materials, the cutting force and cutting heat are concentrated near the cutting edge, and the temperature of the edge area is low. High, leading to problems such as easy chipping and serious wear of the tool. A high-strength square milling insert for processing titanium alloys of the present invention is designed for the actual working conditions of cutting titanium alloys. The milling inserts have high machining accuracy. Excellent surface quality, while slowing down the wear of the tool; the blade avoidance surface is designed to play an anti-vibration role during the cutting process; in addition, an annular cooling groove is designed to reduce the cutting temperature and ease the fastening during the cutting process The role of stress concentration; there are two groups of conical protrusions with the same size parameters on the rake face of the milling insert, which can strengthen the strength of the milling insert, prevent the wear of the milling insert and reduce the cutting temperature during the cutting process . Therefore, while improving the quality of the machined surface, the service life of the milling insert can be effectively improved, and the time for frequent tool change can be reduced. The milling insert has a complete structure and low production cost, and can well meet the needs of the process of milling titanium alloys.

Description of drawings

Fig. 1 is the top view of a kind of titanium alloy processing high-strength square milling insert of the present invention;

Fig. 2 is the front view of Fig. 1;

Fig. 3 is a partial enlarged view of place A in Fig. 2;

Fig. 4 is the bottom view of Fig. 1;

Fig. 5 is an axonometric view of a high-strength square milling insert for processing titanium alloy of the present invention.

Among them: main cutting edge 1, wiper edge 2, rake face 3, threaded mounting hole 4, tip 5, tapered protrusion 6, cutting edge flank 7, insert base flank 8, wiper rear Blade surface 9, V-shaped groove 10, escape surface 11, annular cooling groove 12, bottom surface 13, front curved surface 14, arc-shaped connecting surface 15.

The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the present invention. within the scope of protection.

Detailed ways

Specific embodiment one: as shown in Fig. 1 ~ Fig. 5, a kind of titanium alloy processing high-strength square milling insert, described milling insert is made of cemented carbide material, and the top surface area of milling insert is larger than bottom surface 13 Area, the horizontal cross-sectional shape of the milling insert is square (the side length of the milling insert is 10.2mm and the thickness is 3.6mm), and the geometric center of the milling insert is provided with a thread for fixed connection with the tool holder along the thickness direction Mounting holes 4; the milling blade is provided with two tool noses 5, which are arranged symmetrically with respect to the geometric center of the milling blade (the radius of the two tool noses 5 is 0.5mm); in each knife One side of the tip 5 is provided with a main cutting edge 1, and the other side of each tool nose 5 is provided with a wiper edge 2, and the two main cutting edges 1 are arranged symmetrically with respect to the geometric center of the milling insert. The said wiper edge 2 is also arranged symmetrically with respect to the geometric center of the milling insert (the length of the main cutting edge 1 is 9.5mm, and the length of the wiper edge 2 is 2mm), and the rake face 3 of the milling insert is provided with two A group of conical protrusions with the same size parameters, the two groups of conical protrusions are adjacent to the two main cutting edges 1, each group of conical protrusions includes a plurality of conical protrusions 6, the plurality of conical protrusions The conical protrusions 6 are arranged along the length direction of the main cutting edge 1, and the flank surface of the milling insert including the main cutting edge 1 is composed of the main cutting edge flank surface 7 and the blade base flank surface 8 from top to bottom. The blade base flank 8 is an inclined plane with the lower part inclined toward the inner side of the milling insert (that is, the main cutting edge flank 7 and the blade base flank 8 are not in the same plane). The wiper 2 mainly performs secondary processing on the processed surface to improve the surface quality and slow down the wear of the milling blade. The tip 5 needs to be tempered. The outer surface of the milling insert is provided with a TiCN coating.

On the rake face 3 of the milling insert, there are two groups of conical protrusions with the same size parameters, which is beneficial to strengthen the strength of the milling insert and slow down the wear of the rake face of the milling insert.

The flank 7 of the main cutting edge and the flank 8 of the insert base are not on the same plane, which can improve the strength of the main cutting edge and ensure the quality of the machined surface.

Specific embodiment two: as shown in Fig. 1 ~ Fig. 3 and Fig. 5, a kind of titanium alloy processing high-strength square milling insert described in specific embodiment one, each set of conical projections includes five conical protrusions Protrusions 6 , the five conical protrusions 6 are arranged at equal intervals along the length direction of the main cutting edge 1 .

Specific embodiment three: a kind of high-strength square milling insert for processing titanium alloy described in specific embodiment one, the rake angle of the milling insert is 8°, the rear angle is 10°, the blade inclination angle is 5°, the main The deflection angle is 90°. The milling insert can achieve a large amount of cutting, and at the same time, it can reduce the effect of excessive axial pressure on the processed surface. It is suitable for cutting titanium alloy, and the milling insert has a complete structure and low processing cost.

Specific embodiment four: as shown in Figure 1 and Figure 5, a kind of titanium alloy processing high-strength square milling insert described in specific embodiment 1 or 3, the rake face 3 of described milling insert and threaded mounting hole The area between 4 is the front curved surface 14, and a V-shaped groove 10 is formed between the front curved surface 14 and the rake face 3 of the milling insert. It is beneficial for chip breaking and chip removal, thereby preventing the wear of the milling insert.

Specific embodiment five: as shown in Fig. 1, Fig. 2 and Fig. 5, a kind of titanium alloy processing high-strength square milling insert described in specific embodiment 1 or 3, described milling insert and wiper edge 2 are the same The side flank is composed of a flank 9 including a wiper edge, an arc-shaped connecting surface 15 and an avoidance surface 11, and the flank 9 and the avoidance surface 11 including a wiper edge are formed by an arc The connecting surface 15 is connected. Guarantees the quality of the machined surface and improves the vibration resistance of the milling insert.

Embodiment 6: As shown in FIG. 5 , a high-strength square milling insert for titanium alloy processing described in Embodiment 4, the bottom surface 13 of the milling insert is provided with an annular cooling groove 12 . Its function is to alleviate the stress concentration when the cutting temperature is too high and fastening.

Embodiment 7: As shown in FIG. 1 and FIG. 5 , the high-strength square milling insert for titanium alloy processing described in Embodiment 1, the wiper edge 2 is provided with a blade margin. The function of the blade margin is to increase the strength of the wiper edge.

Embodiment 8: As shown in FIG. 1 and FIG. 5 , a titanium alloy processing high-strength square milling insert described in Embodiment 7, the area between the blade margin and the threaded mounting hole 4 is provided with A surface that varies along the blade margin.

Claims (1)

1. A titanium alloy processing high-strength square milling insert, the milling insert is made of hard alloy material, the top surface area of the milling insert is larger than the bottom surface (13) area, and the horizontal cross-sectional shape of the milling insert is Square, the geometric center of the milling insert is provided with a threaded mounting hole (4) for fixed connection with the cutter bar along the thickness direction; the milling insert is provided with two tool tips (5), and the two tool tips (5 ) is arranged symmetrically with respect to the geometric center of the milling insert; it is characterized in that: a main cutting edge (1) is provided on one side of each tool nose (5), and a main cutting edge (1) is provided on the other side of each tool nose (5) The wiper edge (2), the two main cutting edges (1) are arranged symmetrically with respect to the geometric center of the milling insert, and the two said wiper edges (2) are also symmetrical with respect to the geometric center of the milling insert setting, the rake face (3) of the milling insert is provided with two groups of conical protrusions with the same size parameters, and the two groups of conical protrusions are arranged adjacent to the two main cutting edges (1), each group The conical protrusions include a plurality of conical protrusions (6), and the plurality of conical protrusions (6) are arranged along the length direction of the main cutting edge (1), and the milling insert includes the main cutting edge (1 ) is composed of the main cutting edge flank (7) and the blade base flank (8) from top to bottom, the blade base flank (8) is inclined from the bottom to the inner side of the milling insert slope; Each set of conical protrusions includes five conical protrusions (6), and the five conical protrusions (6) are arranged at equal intervals along the length direction of the main cutting edge (1); The rake angle of the milling insert is 8°, the rear angle is 10°, the blade inclination angle is 5°, and the entering angle is 90°; The area between the rake surface (3) of the milling insert and the threaded mounting hole (4) is the front surface (14), and the front surface (14) of the milling insert and the rake surface (3) A V-shaped groove (10) is formed between them; The flank face on the same side as the wiper edge (2) on the milling insert is composed of a flank face (9) including a wiper edge, an arc-shaped connecting surface (15) and an escape surface (11). The flank (9) containing the wiper edge and the avoidance surface (11) are connected by an arc-shaped connecting surface (15); The bottom surface (13) of the milling blade is provided with an annular cooling groove (12); The wiper blade (2) is provided with a blade margin; The area between the blade margin and the threaded mounting hole (4) is provided with a curved surface that changes along the blade margin; The outer surface of the milling insert is provided with a TiCN coating.