CN201609780U

CN201609780U - Active type chip breaking drill bit

Info

Publication number: CN201609780U
Application number: CN201020003306XU
Authority: CN
Inventors: 刘伟
Original assignee: AHNO (SUZHOU) CUTTING TOOLS Co Ltd
Current assignee: Suzhou Ahno Cutting Tool Technology Co., Ltd.
Priority date: 2010-01-03
Filing date: 2010-01-03
Publication date: 2010-10-20
Anticipated expiration: 2020-01-03

Abstract

The utility model provides an active type chip breaking drill bit which comprises a head part and a handle part. At the head part, a chip discharging groove is formed on a cylinder body in the central axis line, and an entity part for forming the chip discharging groove is taken as the back; the intersecting line of the chip discharging groove and the back forms a main cutting edge in the axial direction; the intersecting line of the chip discharging groove and the back forms an accessory cutting edge in the axis direction; the accessory cutting edge and the main cutting edge are crossed and form a drill head; a chip breaking groove formed in the chip discharging groove is parallel to the main cutting edge; and and a chip dividing groove formed on the main cutting edge is perpendicular to the main cutting edge. Formed in the chip discharging groove, the chip breaking groove parallel to the main cutting edge can produce additive deformation to chips, therefore the chips are fractured after the deformation, and the discharging process of the chips is smooth. Moreover, the chip dividing groove is arranged and used for dividing the chips into two or three sections along the diameter direction, therefore the discharging process of the chips is smoother. The active type chip breaking drill bit is widely suitable for drilling intractable materials in space industry, military industry and other public industries.

Description

Active-type chip-breaking drill bit

Technical field

The utility model relates at a high speed, superhard precision cutting tool, relate in particular to a kind of be used for the processing of high-toughness high-strength material (as stainless steel, titanium alloy, difficult-to-machine materials such as Ni-based cobalt-based) hole from the chip breaking drill bit.

Background technology

At present difficult-to-machine material aviation manufacturing, military project and weapons, and all conglomeraties such as gas turbine be used widely.

The cutting of hardworking material is compared with general steel, cutting of hardworking material processing difficulties mainly shows the following aspects: 1) the work hardening tendency is big, such as the GH4169 about HRC37 of matrix hardness of intensive treatment not, the cutting rear surface produces the hardened layer of 0.03 millimeter, hardness is increased to about HRC47, and hardenability is up to 27%; The work hardening phenomenon has a significant impact cutter life, can produce serious boundary wear usually; 2) cutting force is big, and difficult-to-machine material strength ratio steam turbine alloy steel material commonly used is high more than 30%, and under the cutting temperature more than 600 ℃, the intensity of Ni-based difficult-to-machine material still is higher than common alloy steel material; The difficult-to-machine material unit of intensive treatment cutting force is not more than 4000N/mm2, and common steel alloy 2500N/mm2 only; 3) material thermal conductivity is poor, and a large amount of heat in metal cuttings that produce during the cutting difficult-to-machine material are born by cutter, and point of a knife has born the cutting temperature up to 800～1000 ℃, under high temperature and big cutting force effect, will cause cutting edge to produce plastic deformation, bonding and diffusive wear; 4) the nickel-base alloy Main Ingredients and Appearance is nickel and chromium, also be added with a small amount of other element in addition, as molybdenum, tantalum, niobium, tungsten etc., it should be noted that, tantalum, niobium, tungsten etc. also are the main components that is used for making carbide alloy or high-speed steel tool, can produce diffusive wear and abrasive wear with these cutter difficult processing rapidoprints.

Hole processing is the bigger processing mode of difficulty in the machining, belongs to semi-enclosed processing.During particularly solid boring, heat in metal cutting very easily is trapped near the cutting edge, and the timely discharge of heat in metal cutting and smear metal is very difficult, and this is the key point that influences cutter life.

With respect to general cutting rolled steel processing, the cutter life of cutting difficult-to-machine material will be hanged down more than 50%, and working (machining) efficiency is very low, and processing cost is also much higher.The difficult-to-machine material hole processes main difficult point: 1) cutting force is big, and it is big to consume machine power; 2) hole processing is semi-enclosed cutting, and the high heat in metal cutting of generation and the smear metal of chip breaking difficulty are difficult in time discharge away from point of a knife, and tool wear is more violent; 3) in the processing of difficult-to-machine material hole, tool wear is more faster than the processing common iron, and needs the better cutter material of cutting ability.

The chip breaking of conventional drill mainly is to adopt the cutting edge bending, for providing the mode of additional deformation, cutting obtains, but because the physical property and the cutting characteristics of above-mentioned difficult-to-machine material, this method can and be fit to difficult-to-machine material.

As seen, problems such as low, cost height of the life-span that the difficult-to-machine material drill exists are to be badly in need of the technical barrier that solves.Its solution should lay particular emphasis on the improvement of chip breaking principle, makes the smear metal smooth and easy then discharge of initiatively rupturing to guarantee carrying out smoothly of boring.

The utility model content

The purpose of this utility model is to overcome the deficiency that prior art exists, and a kind of active-type chip-breaking drill bit is provided, and solves the chip removal heat dissipation problem, protects the drill bit cutting edge to keep cutting power better.

The purpose of this utility model is achieved through the following technical solutions:

Active-type chip-breaking drill bit, comprise head and shank, described head is to drive chip area on the cylinder with central axis, the entity part that is used to form chip area is the back of the body, described chip area and the intersection formation main cutting edge of the back of the body on axis direction, described chip area forms front cutting edge with the intersection of carrying on the back in the radial direction, and front cutting edge and main cutting edge intersect the formation point of a knife, characteristics are: be provided with chip-breaker in the described chip area, described chip-breaker parallels with main cutting edge.

Further, above-mentioned active-type chip-breaking drill bit, wherein, described main cutting edge is provided with chip dividing groove, and described chip dividing groove and main cutting edge are perpendicular.

Further, above-mentioned active-type chip-breaking drill bit, wherein, the profile of described chip-breaker linearly section is connected the line segment that forms with arc section.

Again further, above-mentioned active-type chip-breaking drill bit, wherein, the angle of described straightway and cutting plane is 45 °, the radius of described arc section is not less than 0.3mm.

The substantive distinguishing features of technical solutions of the utility model and progressive being mainly reflected in:

1. the utility model drill bit design uniqueness, by be provided with the chip-breaker that parallels with main cutting edge in chip area, chip-breaker produces additional deformation to smear metal, ruptured in smear metal distortion back, be figure six, rather than spiral or band shape, guarantee the smooth and easy discharge of smear metal;

2. active-type chip-breaking drill bit is provided with chip dividing groove, is used for smear metal is divided into two to three sections along diametric(al), and is stronger in the smooth discharge of smear metal;

3. active-type chip-breaking drill bit is longer its service life when the difficult processing rapidoprint, and working (machining) efficiency has improved about 1.5 times; Be widely used in the difficult-to-machine material drilling of Aero-Space, military project weapons and other civil area.

Description of drawings

Below in conjunction with accompanying drawing technical solutions of the utility model are described further:

Fig. 1 a: the schematic diagram that is provided with the active-type chip-breaking drill bit of chip-breaker;

Fig. 1 b: the A of Fig. 1 a is to enlarged diagram;

Fig. 2 a: the master who is provided with the active-type chip-breaking drill bit of chip dividing groove looks schematic diagram;

Fig. 2 b: schematic diagram is looked on the left side of Fig. 2 a.

The implication of each Reference numeral sees the following form among the figure:

Reference numeral	Implication	Reference numeral	Implication	Reference numeral	Implication
Reference numeral	Implication	Reference numeral	Implication	Reference numeral	Implication		1	Chip area	2	The back of the body	3	Main cutting edge
4	Front cutting edge	5	Point of a knife	6	Chip-breaker		1	Chip area	2	The back of the body	3	Main cutting edge
4	Front cutting edge	5	Point of a knife	6	Chip-breaker	7	Chip dividing groove

The specific embodiment

As shown in Figure 1a, active-type chip-breaking drill bit, comprise head and shank, head is to drive chip area 1 on the cylinder with central axis, the entity part that is used to form chip area is the back of the body 2, chip area 1 forms main cutting edge 3 with the intersection of the back of the body 2 on axis direction, the chip area 1 and the back of the body 2 form front cutting edge 4 at intersection in the radial direction, front cutting edge 4 intersects formation point of a knife 5 with main cutting edge 3, is provided with chip-breaker 6 in the chip area 1, and chip-breaker 6 parallels with main cutting edge 3, as Fig. 1 b, the profile of chip-breaker 6 linearly section is connected the line segment that forms with arc section, the angle of straightway and cutting plane is 45 °, and the radius of arc section is not less than 0.3mm.

Shown in Fig. 2 a, 2b, on above-mentioned architecture basics, main cutting edge 3 is provided with chip dividing groove 7, and chip dividing groove 7 is perpendicular with main cutting edge 3.

Active-type chip-breaking drill bit adopts the manufacturing of whole hard alloy material, and according to the different trades mark of working depth different choice, deep hole machining adopts ISO30-40, and shallow bore hole processing can be selected ISO05-10 for use.Selection principle is: 1) hardness and intensity, satisfy hardness＞HRV1720, tensile strength 3200N/mm ²2) grain size, grain size directly determine the toughness of carbide alloy, and be particularly important in deep hole machining, and the bar grain size of powerful drill is not more than 0.4～0.5 μ m.

Flute profile was selected the common slotted wheel of 1A1 when active-type chip-breaking drill bit was made, and the thick guarantee point R of core is about 0.3min; The chip-breaker emery wheel adopts 11V9, emery wheel cusp circular arc R 0.3max.

The utility model is by being provided with the chip-breaker 6 that parallels with main cutting edge 3 in

chip area

1,6 pairs of smear metals of chip-breaker produce additional deformation, are ruptured in smear metal distortion back, are figure six, rather than spiral or band shape, guarantee that then smear metal can discharge swimmingly.For guaranteeing the smooth processing of chip-breaker, do not influence other structure, must be optimized design to chip area, need enough positive core height.The mode that chip-breaker adopts straight line to combine with circular arc, about 45 ° of straight line anterior angle, circular arc is not less than R0.3.

According to bit diameter, active-type chip-breaking drill bit is provided with chip dividing groove 7, is used for smear metal is divided into two to three sections along diametric(al), and is stronger in the smooth discharge of smear metal.

Active-type chip-breaking drill bit is used for better rigidity lathes such as machining center, machined material 0Cr17Ni17Mo2, hardness HB280, tensile strength 1200N/mm ², concrete cutting parameter and contrast see Table 1.

Table 1

The cutting situation	Active-type chip-breaking drill bit 12mm	Common drill bit 12mm
The cutting situation	Active-type chip-breaking drill bit 12mm	Common drill bit 12mm	Cutting speed	48M/min	40M/min
The speed of mainshaft	1273	1061	Cutting speed	48M/min	40M/min
The speed of mainshaft	1273	1061	Feed speed	153mm/min	106mm/min
Processing quantity	1600	450	Feed speed	153mm/min	106mm/min
Processing quantity	1600	450	Stock-removing efficiency	144％	100％
Machining accuracy	IT8	IT9	Stock-removing efficiency	144％	100％
Machining accuracy	IT8	IT9	Surface quality	Ra6.3	Ra6.3

In sum, the utility model active-type chip-breaking drill bit is longer its service life when the difficult processing rapidoprint, and working (machining) efficiency has improved about 1.5 times.Can be widely used in the difficult-to-machine material drilling of Aero-Space, military project weapons and other civil area.

What need understand is: the above only is a preferred implementation of the present utility model; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims

1. active-type chip-breaking drill bit, comprise head and shank, described head is to drive chip area on the cylinder with central axis, the entity part that is used to form chip area is the back of the body, described chip area and the intersection formation main cutting edge of the back of the body on axis direction, described chip area forms front cutting edge with the intersection of carrying on the back in the radial direction, and front cutting edge and main cutting edge intersect the formation point of a knife, it is characterized in that: be provided with chip-breaker in the described chip area, described chip-breaker parallels with main cutting edge.

2. active-type chip-breaking drill bit according to claim 1 is characterized in that: described main cutting edge is provided with chip dividing groove, and described chip dividing groove and main cutting edge are perpendicular.

3. active-type chip-breaking drill bit according to claim 1 is characterized in that: the profile of described chip-breaker linearly section is connected the line segment that forms with arc section.

4. active-type chip-breaking drill bit according to claim 3 is characterized in that: the angle of described straightway and cutting plane is 45 °, and the radius of described arc section is not less than 0.3 mm.