CN209830302U - PCD (polycrystalline Diamond) forming cutter for processing aviation composite material - Google Patents

Abstract

The utility model discloses a PCD shaping cutter of processing aviation combined material, including handle of a knife and tool bit, be provided with the bulb guide post that the radius is 2.4 millimeters on the tool bit, the bulb guide post about the axis symmetry of cutter, blade on the tool bit forms the guide cone with the axis slope and to the chamfer of 100 +/-10' of formation is extended to the direction of handle of a knife, the guide cone with bulb guide post interval. The cutter of the utility model improves the precision of the advancing direction of the cutter head in the processing process through the ball head guide post on the cutter head; the guide cone eliminates the step surface or burrs of the hole wall caused by tool deflection and vibration in the machining process; compared with the front angle of a common hard alloy cutter, the front angle design of the forming surface increases by 2-3 degrees, the cutting resistance is reduced, and the cutting efficiency is improved.

Description

PCD (polycrystalline Diamond) forming cutter for processing aviation composite material

Technical Field

The utility model relates to an aviation combined material processing field especially relates to a PCD shaping cutter of processing aviation combined material.

Background

The composite material CFRP (carbon fiber reinforced plastics) is a resin-based composite material taking carbon fibers as a reinforcement, has the characteristics of high base density strength, good fatigue resistance, stable chemical performance and the like, and is widely applied to the fields of aerospace, wind power generation and automobiles.

With the continuous emergence of new generation aircrafts in China, the aviation field is developed vigorously; the science and technology in the field of new energy resources are continuously updated, and the importance of the carbon fiber composite material is highlighted day by day. How to process these materials with quality, efficiency and high precision has increasingly attracted the attention of the engineers in mechanical manufacturing.

The CFRP has anisotropic mechanical property, low interlayer strength, high hardness, high strength and poor thermal conductivity of carbon fiber, thereby bringing great trouble to mechanical processing.

The current tool materials for processing CFRP are hard alloy and polycrystalline diamond PCD. Compared with a hard alloy cutter, the PCD cutter has better sharpness and abrasion resistance, has fewer defects in machining CFRP materials, and has good surface quality and durability.

Most PCD cutters for machining CFRP materials in the aviation field are currently held by Europe and America manufacturers, such as SECO in Switzerland, Mapal, Kennal in America, ISCAR in Israel, and the like. Domestic PCD cutters are only used for a small number of non-critical tools. On the one hand, the PCD cutter is weaker than that of the Western aviation kingdom due to the late start of the processing of the aviation composite material in China.

The PCD forming tool has the advantages that the tool bit is prone to deviation in the machining process, the chip resistance is large, machining efficiency is low, surface roughness is poor, and burrs, tearing and the like exist in an orifice.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a PCD shaping cutter of processing aviation combined material, including handle of a knife and tool bit, be provided with the bulb guide post that the radius is 2.4 millimeters on the tool bit, the bulb guide post about the axis symmetry of cutter, blade on the tool bit forms the guide cone with the axis slope and to the chamfer of 100 +/-10' of formation is extended to the direction of handle of a knife, the guide cone with bulb guide post interval.

The cutter of the utility model improves the precision of the advancing direction of the cutter head in the processing process through the ball head guide post on the cutter head; the guide cone eliminates the step surface or burrs of the hole wall caused by tool deflection and vibration in the machining process; compared with the front angle of a common hard alloy cutter, the front angle design of the forming surface increases by 2-3 degrees, the cutting resistance is reduced, and the cutting efficiency is improved.

Further, the angle formed by the guide cone and the axis of the cutter is 1-2 degrees.

Further, the guide cone extends towards the direction of the tool holder to form an arc structure with the radius of 0.6 mm.

Further, the arc structure is tangent to the extension line of the ball head guide post.

Further, the size of the raised particles on the cutting edge is less than 0.004 mm.

Furthermore, the tool bit and the tool shank are made of 5um fine-grain PCD materials.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic plan structure view of a PCD forming tool for processing an aerospace composite material according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of FIG. 1 at I;

fig. 3 is a schematic end plane structure diagram of a tool bit of the PCD forming tool for processing aviation composite material according to an embodiment of the present invention.

Detailed Description

The following disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1-3, the PCD forming cutter for processing aviation composite materials provided by the embodiment of the present invention includes a handle 1 and a head 2, the head 2 is provided with a ball head guide post 21 with a radius of 2.4 mm, the ball head guide post 21 is symmetrical with respect to the axis of the cutter, the cutting edge on the head 2 is inclined with the axis to form a guide cone 22 and extends to the direction of the handle 1 to form a 100 ° ± 10' chamfer α, and the guide cone 22 is spaced from the ball head guide post 21.

The cutter of the utility model improves the accuracy of the advancing direction of the cutter head 2 in the processing process through the ball head guide post 21 on the cutter head 2; the guide cone 22 eliminates the step surface or burr of the hole wall caused by the deflection and vibration of the cutter in the processing process; compared with the front angle of a common hard alloy cutter, the front angle design of the forming surface increases by 2-3 degrees, the cutting resistance is reduced, and the cutting efficiency is improved.

Specifically, the utility model discloses utilize PCD's high rigidity and high wearability, combine the structural improvement of processing cutter, reduce the burr that produces in the CFRP material course of working, tear, processing defects such as layering, reach the higher processing standard of trade, change the situation is held to the European and American cutter domination, realize the import substitution of aviation industry combined material processing cutter.

In addition, referring to fig. 3, the groove surface of the cutting tool of the present invention is lower than the center to form a larger rake angle.

Further, to assist understanding of the background of the present invention, the following description is made: the CFRP material has poor mechanical properties in the thickness direction and the horizontal direction, and when the axial force borne by the fiber layers is greater than the bonding strength between the composite material fiber layers in the drilling, reaming and reaming processes, the interior of the material is easy to generate layering damage; when the blade contacts the last layer of fiber material, the lower layer has no material support, so the rigidity is low, the fiber bundle is easy to disperse and is not easy to cut off, and the phenomena of tearing and burr are generated. The high hardness and powdery cutting scraps of the carbon fibers easily cause severe abrasion of the cutter.

Further, the angle formed by the guide cone 22 and the axis of the tool is 1-2 °. In this manner, the guide cone 22 avoids uneven intersections due to manufacturing tolerances.

Further, the guide cone 22 extends towards the tool holder 1 to form an arc structure 23 with a radius of 0.6 mm.

Further, the arc structure 23 is tangent to the extension line of the ball head guide post 21.

Specifically, the arc with the cutting edge radius of 0.6 mm of the cutter is tangent to the extension line of the ball head guide post 21.

Further, the size of the raised particles on the cutting edge is less than 0.004 mm.

Specifically, the utility model provides a cutter adopts fine grain 5 um's PCD material to make, and the roughness of blade is less than 0.004mm to greatly increased the blade sharpness of cutter.

Further, the tool bit 2 and the tool shank 1 are made of 5um fine-grain PCD materials.

And simultaneously, the utility model provides a tail end screw thread of cutter adopts grinding process, and the ball head guide post 21 and the 120 locating surface of radius 2.4 millimeters adopt the optical curve grinding machine, accomplish the grinding through a clamping, have guaranteed the link precision of cutter with the pneumatic drill, have guaranteed the precision of beating of cutter blade.

Specifically, 5um fine grain PCD material is produced by the american DI corporation, ensuring the quality of the tool from the source.

Further, the utility model provides a cutter has still adopted the carbide cutter body, replaces original alloy steel cutter body, increases the elastic modulus and the intensity of cutter.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (6)

1. The utility model provides a PCD shaping cutter of processing aviation combined material, its characterized in that includes handle of a knife (1) and tool bit (2), be provided with bulb guide post (21) that the radius is 2.4 millimeters on the tool bit, the bulb guide post about the axis symmetry of cutter, blade and axis slope on the tool bit form guide cone (22) and to the direction of handle of a knife extends chamfer (alpha) that forms 100 +/-10', the guide cone with the bulb guide post interval.

2. A PCD shaping tool for machining aerospace composites according to claim 1, characterised in that the angle formed by the pilot cone and the axis of the tool is between 1 ° and 2 °.

3. The PCD forming tool according to claim 1, wherein the guide cone extends in the direction of the shank to form a circular arc structure (23) with a radius of 0.6 mm.

4. The PCD shaping tool of claim 3, wherein the circular arc structure is tangent to an extension of the ball-end guide post.

5. The PCD forming tool of claim 1 wherein the raised grains on the cutting edge are less than 0.004mm in size.

6. The PCD shaping tool of claim 1 wherein the cutting tip and shank are formed of 5um fine grain PCD material.