CN108971589A - A kind of PCD milling cutter for composite material Milling Process - Google Patents

Abstract

The invention discloses a PCD milling cutter for composite material milling, which belongs to the field of mechanical processing, and comprises a milling cutter base, a handle, two sets of blades and end milling blades arranged on the milling cutter base; the blades have two group, including two near-handle blades and two far-handle blades; the far-handle blades and the near-handle blades are inclined in opposite directions and have the same angle; There is a chip flute between the near shank blade and the chip flute has no overlap in the axial direction; the end milling edge can realize end milling with a small depth of cut, and the material of the end milling edge is the base material. The invention can realize end milling and peripheral milling with small depth of cut, reduce the axial force during peripheral milling, and suppress defects such as delamination of composite materials, surface tearing and burrs; the set chip removal groove can effectively remove chips and dissipate heat. The blade with an inclination angle in the opposite direction reduces the impact force of the PCD blade, further prolonging the service life of the PCD milling cutter.

Description

A PCD milling cutter for composite material milling

technical field

The invention relates to the field of mechanical processing, in particular to a PCD milling cutter for composite material milling.

Background technique

Composite material refers to a material composed of two or more different substances combined in different ways. It has the advantages of light weight, high strength, chemical corrosion resistance and weather resistance, and is widely used in automobiles, aerospace, fitness equipment and other fields. At present, the molding of composite parts mainly adopts near net shape technology, however, it is difficult to obtain precise dimensional accuracy of the manufactured composite materials. Therefore, secondary processing is required. Composite materials have high hardness, heterogeneous and anisotropic structures, and are typical difficult-to-process materials.

If milling with ordinary tools, the tool wears faster. The solid carbide tool is rigid and moderate in hardness, and the tool can be sharpened into various angles, which is beneficial to control the distribution of cutting force, but the wear resistance is still insufficient for cutting composite materials. Due to the above-mentioned difficulty in machining, coated knives were developed and widely used in milling of composite materials. However, the coated knife also has the problem of coating shedding. Once the coating falls off, the tool will quickly wear out and fail. However, PCD (polycrystalline diamond) tools do not have this problem. It has a long service life and high machining accuracy, and has become a high-quality tool for composite materials. The tool of choice for finishing.

Existing PCD tools are manufactured with the same blade inclination angle. In the process of processing composite materials, only one surface of the processing surface can be guaranteed not to have defects such as delamination, while the other surface is prone to delamination, tearing, burrs and other processing Defects affect the processing quality.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention discloses a PCD milling cutter for composite material milling, which adopts two sets of far-shank blades and near-shank blades with opposite inclination angles, and is provided with a The chip flute makes the axial force of the PCD milling cutter smaller when it is working, thereby solving the defects in the prior art such as delamination, tearing and burrs generated in the process of peripheral milling and processing composite materials.

The present invention is achieved like this:

A PCD milling cutter used for milling of composite materials comprises a milling cutter base body and a tool handle connected with the milling cutter base body. The far handle end of the milling cutter base body is provided with four milling cutter slots, and each milling cutter slot is provided with a corresponding blade; the blades are respectively the first far handle blade, the first near handle blade, the second far handle blade, the second Near handle blade.

Both sets of blades are inclined, and the same angle is set between the two sets of blades and the central axis of the milling cutter base, and the blades of the same set are inclined in opposite directions; this design reduces the impact force, increases the service life of the tool, and inhibits Composites delamination, surface peeling and burr generation.

A first chip removal groove is arranged between the first far handle blade and the first near handle blade; a second chip removal groove is arranged between the second far handle blade and the second near handle blade; The length of the two chip flutes is equal; setting the chip flute increases the chip removal capacity, reduces the impact of chips on the tool and the machined surface, and further prolongs the service life of the tool. The first chip flute and the second chip flute have no overlapping parts along the axial direction of the milling cutter base; the third chip flute is provided in front of the main cutting edge of the two sets of inserts, and the gap between the rake face and the bottom surface of the chip flute is The angle formed is 90°.

Further, the angle between the bottom surface of the third flute and the bottom surfaces of the first flute and the second flute is 90°-135°.

Further, the length of the first chip flute and the second chip flute along the axial direction of the milling cutter base is 0.5-1.5 mm.

Further, the inclination direction of the first far-handle blade and the second far-handle blade is right-inclined, and the inclination angle is 3° to 12°; the inclination direction of the first near-handle blade and the second near-handle blade is left-inclined, and the inclination angle is -3° °~-12°.

Further, the length of the first distal handle blade is the same as that of the second proximal handle blade; and the length is 4-8mm. The length of the first near-handle blade and the second remote-handle blade is the same; and the length is different from the first far-handle blade or the second near-handle blade by the length of a chip flute.

Further, the end of the distal shank of the milling cutter slot is provided with an end milling edge. The end milling edge enables end milling with small depths of cut.

Further, the end mill blade and the milling cutter base are integrated, that is, the material of the end mill blade is consistent with the material of the milling cutter base.

The beneficial effect of the present invention compared with prior art is:

1) The present invention adopts the far-shank blade and the near-shank blade with opposite inclinations. When milling, the blade can simultaneously generate downward and upward cutting force on the upper surface of the composite material. When the middle of the far-handle and the near-shank blade When the chip flute is located at the center of the side of the composite material, the cutting force components of downward pressure and upward pressure cancel each other out, and the axial force is reduced during peripheral milling. During the cutting process of each blade, the force points to the inside of the plate, thereby inhibiting the composite material. The generation of defects such as layers, surface peeling and burrs;

2) The PCD milling blades are arranged with an inclination angle, and the blades with inclination angles in the opposite direction reduce the impact force of the PCD blades and further prolong the service life of the PCD milling cutters; this arrangement replaces the straight groove blades in the traditional technology The arrangement method reduces the impact force and increases the service life of the tool;

3) By setting the chip removal groove between the far shank blade and the near shank blade, the chip removal groove can effectively remove chips and dissipate heat, increase the chip removal capacity, and reduce the impact of chips on the tool and the machined surface. Further prolonging tool life;

4) A blade for end milling is provided at the far shank end of the milling cutter groove, and the blade is integrated with the substrate. The end milling blade can realize end milling with a small depth of cut, and realize rapid treatment of the surface waviness of the composite material sheet. Facilitate further processing.

Description of drawings

Fig. 1 is a front view of a PCD milling cutter for composite material milling of the present invention;

The expanded view of two groups of blades of Fig. 2 PCD milling cutter of the present invention;

Fig. 3 PCD milling cutter end milling blade diagram of the present invention;

Among them, 1-milling cutter base, 11-knife handle, 2-milling cutter groove, 3-blade, 31-far shank blade, 32-near shank blade, 31-1 first far shank blade, 31-2 second far Shank insert, 32-1 first near-shank insert, 32-2 second near-shank insert, 4-1 first flute, 4-2 second flute, 5-third flute, 6-end Milling edge.

Detailed ways

In order to make the object, technical solution and effect of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be pointed out that the specific implementations described here are only used to explain the present invention, not to limit the present invention.

As shown in FIG. 1 , the PCD milling cutter for composite material milling according to the present invention is composed of a milling cutter base 1 , a handle 11 and two sets of blades 3 arranged on the milling cutter base 1 .

Described PCD milling cutter is provided with two groups of blades 3, and each group of blades comprises two near-handle blades 32 close to the handle 11 and two far-handle blades 32 away from the handle 11, specifically the first far-handle blade 31 -1, the first near-handle blade 32-1 and the second far-handle blade 31-2, the second near-handle blade 32-2; the two far-handle milling blades, that is, the first far-handle blade 31-1 1. The second distal shank blade 31-2 is welded in the milling cutter slots 2 provided at the two front ends. The two near-shank milling inserts, that is, the first near-shank insert 32-1 and the second near-shank insert 32-2 are welded in the remaining two milling cutter slots 2.

A first flute 4-1 is arranged between the first far handle blade 31-1 and the first near handle blade 32-1; between the second far handle blade 31-2 and the second near handle blade 32-2 There is a second flute 4-2; the first flute 4-1 and the second flute 4-2 have no overlap along the central axis. Two groups of blades 3 are all obliquely arranged, and the inclination direction of the first far handle blade 31-1 and the second far handle blade 31-2 is rightward, and the inclination angle is 6 °, the first near handle blade 32-1, the second near handle The inclination direction of the blade 32-2 is left-inclined, and the inclination angles are -6°. The PCD milling blades are arranged with an inclination angle, and the blades with inclination angles in the opposite direction reduce the impact force of the PCD blades and further prolong the service life of the PCD milling cutters. The front of the main cutting edge of the two groups of inserts are all provided with a third flute 5 .

As shown in Figure 2, the length of the first far handle blade 31-1 and the second near handle blade 32-2 is the same, being 3mm, the length of the first near handle blade 32-1 and the second far handle blade 31-2 is the same, 4mm; the length of the first flute 4-1 and the second flute 4-2 along the axial direction of the milling cutter base 1 is 1mm, and the first flute 4-1 and the second flute 4-2 There is no overlap in the axial direction. The chip removal groove can effectively remove chips and dissipate heat, increase the chip removal capacity, reduce the impact of chips on the tool and the machined surface, and further extend the service life of the tool

As shown in Figure 3, an end milling cutter blade 6 is provided at the end of the distal shank in the milling cutter groove 2, and the end milling cutter blade 6 is integrated with the milling cutter base 1, and the material of the end milling cutter edge and the milling cutter base 1 material Consistent, the end milling blade can realize end milling with small depth of cut, and the end milling blade can perform end milling with small depth of cut, so as to realize rapid treatment of surface waviness of composite material sheet, and facilitate further processing.

The structure of the PCD milling cutter for milling of composite materials designed by the present invention can reduce the impact force and axial force during peripheral milling, suppress the generation of defects such as composite material delamination, have strong chip removal ability, and have long tool life; At the same time, end milling tasks with small depth of cut can be performed.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements can also be made, for example, according to other actual operations, The length values of the two groups of blades, the inclination angles of the two groups of blades, the length values of the flutes, etc. of the present invention can be reset, and these improvements should also be regarded as the scope of protection of the present invention.

Claims (7)

1. A PCD milling cutter for composite material milling, comprising a milling cutter base (1) and a handle (11) connected to the milling cutter base (1), characterized in that the milling cutter base (1 ) is provided with four milling cutter slots (2) at the far handle end, and two sets of blades (3) are arranged inside the milling cutter slots (2); the two sets of blades (3) are respectively the first remote handle blades (31- 1), the first near-handle blade (32-1), the second far-handle blade (31-2), and the second near-handle blade (32-2); The two groups of blades (3) are arranged obliquely, the same angle is set between the two groups of blades (3) and the central axis of the milling cutter base (1), and the direction of inclination of the blades of the same group is opposite; A first flute (4-1) is provided between the first distal blade (31-1) and the first proximal blade (32-1); A second chip removal groove (4-2) is provided between the second far handle blade (31-2) and the second near handle blade (32-2); and the first chip removal groove (4-1) and the second Chip flutes (4-2) are equal in length; The first flute (4-1) and the second flute (4-2) have no overlapping parts along the axial direction of the milling cutter base (1); the two sets of inserts (3) are equipped with a third Chip flutes (5). 2. A PCD milling cutter for composite material milling according to claim 1, characterized in that the groove bottom surface of the third flute (5) is in contact with the first flute (4-1), the first flute The angle between the groove bottom surfaces of the two flutes (4-2) is 90°-135°. 3. A PCD milling cutter for composite material milling according to claim 1 or 2, characterized in that the first flute (4-1) and the second flute (4-2) are along the The axial length of the milling cutter base (1) is 0.5-1.5mm. 4. A PCD milling cutter for composite material milling according to claim 1, characterized in that the inclination direction of the first remote shank blade (31-1) and the second remote shank blade (31-2) The inclination angles of the first near-handle blade (32-1) and the second near-handle blade (32-2) are left-inclined, and the inclination angles are both -3°~-12°. 5. A PCD milling cutter for composite material milling according to claim 4, characterized in that the length of the first distal shank blade (31-1) is the same as that of the second proximal shank blade (32-2) ; and the length is 4~8mm The length of the first near-handle blade (32-1) and the second far-handle blade (31-2) is the same; The length of the chip flute (4). 6. A PCD milling cutter for composite material milling according to claim 1, characterized in that the end of the distal shank of the milling cutter groove (2) is provided with an end milling edge (6). 7. A PCD milling cutter for composite material milling according to claim 6, characterized in that the end milling edge (6) and the milling cutter base (1) are integrally structured, that is, the end milling The cutting edge material is consistent with the material of the milling cutter base (1).