CN214023645U

CN214023645U - Round pin centering double-limit side pressure locking tooth crown tool bit

Info

Publication number: CN214023645U
Application number: CN202022344219.7U
Authority: CN
Inventors: 蒋长青; 欧望达; 卜新荣; 沈秋波; 范羽; 殷亚军
Original assignee: Suzhou Ahno Precision Cutting Technology Co ltd
Current assignee: Suzhou Ahno Precision Cutting Technology Co ltd
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2021-08-24
Anticipated expiration: 2030-10-20

Abstract

The utility model discloses a two spacing side pressure locking tooth crown tool bits of round pin centering, the direction awl is established in the assembly area, the cylindric lock, the circular arc transition face, holding surface and bottom surface, the face of cylinder is established in the cutting area, the two spacing faces of L type, main sword and interior sword, the cylindric lock is coaxial with the face of cylinder, the bottom surface is perpendicular with the cylindric lock axis, the holding surface side pressure face is the inclined plane, holding surface side pressure face bottom is personally submitted circular-arcly, two sets of and non-central symmetry altogether of L type two spacing faces, form the transition sword between main sword and the interior sword, the main sword, interior sword and transition sword are on the chip groove front end, the entity part of chip groove on the cutting area is the back, the chip groove forms the edge with the crossing shape of face in radial direction with the back. The utility model provides a circle round pin centering double-limit side pressure locking tooth crown tool bit uses the cylindric lock centering, and centering precision is high, can bear big moment of torsion, and tool bit centering circle external shock is little, difficult rupture or wearing and tearing, and the tool bit is longe-lived, and it is firm to lock, and low cost is fit for the big torsion precision finishing of major diameter in batches.

Description

Round pin centering double-limit side pressure locking tooth crown tool bit

Technical Field

The utility model belongs to the technical field of accurate high-efficient metal cutting tool, concretely relates to round pin centering double spacing side pressure locking tooth crown tool bit.

Background

With the rapid development of industries such as engineering machinery, heat exchangers, wind power and the like, large-diameter holes are processed more and more. The existing integral hard alloy drill bit is expensive and high in processing cost, a crown cutter head is produced at the same time, the crown cutter head is a combined drill bit with a head made of hard alloy or other high-performance materials, a drill rod made of alloy steel materials, and the combined drill bit is suitable for processing large-diameter holes and has the advantages of low use cost, large processing range and the like. At present, the head of the crown bit and a drill rod have various combination modes, but most of the crown bits have complex structures, low assembly precision of tool bits and high manufacturing cost. Therefore, the method has important practical significance for seeking a novel, efficient, low-cost and high-precision crown and cutter head combination mode.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem that exists among the prior art, the utility model aims to provide a round pin centering is two spacing side pressure locking tooth crown tool bit.

In order to realize the above purpose, reach above-mentioned technological effect, the utility model discloses a technical scheme be:

a round pin centering double-limit side pressure locking tooth crown tool bit comprises an assembly area and a cutting area, wherein the assembly area is provided with a guide cone, a cylindrical pin, an arc transition surface, a locking surface and a bottom surface, the cutting area is provided with a back part, an edge, a cylindrical surface, an L-shaped double-limit surface, a main blade and an inner blade, the cylindrical pin is coaxial with the cylindrical surface, the bottom surface is perpendicular to the central axis of the cylindrical pin, the locking surface is arranged on the cylindrical pin, the locking surface side pressure surface is an inclined surface, the bottom surface of the locking surface side pressure surface is arc-shaped, the L-shaped double-limit surfaces are arranged in two groups and are not centrosymmetrically, the transition blade is formed between the main blade and the inner blade, the main blade, the inner blade and the transition blade are arranged at the front end of a chip discharge groove, the solid part except the chip discharge groove on the cutting area forms the back part, and the edge is formed by the intersection surface of the chip discharge groove and the back part in the radial direction, the round pin centering double-limit side pressure locking crown tool bit is centered through the cylindrical pin and detachably mounted on the drill rod through the locking screw.

Furthermore, the length of the guide cone is 0.1-1mm, and the taper is 30 degrees.

Furthermore, the included angle between the side pressure surface of the locking surface and the central axis of the cylindrical pin is 30-75 degrees.

Furthermore, the two groups of L-shaped double limiting surfaces are respectively a first L-shaped double limiting surface and a second L-shaped double limiting surface, and the formed eccentricity is 0.02-0.2 mm.

Further, the length of the inner blade is 1/4-1/2 of the length of the main blade.

Furthermore, the size of the arc of the transition edge is R0.1-3 mm.

Further, the helix angle of chip groove is 0 ~ 35.

Compared with the prior art, the beneficial effects of the utility model are that:

the cylindrical pin is used for centering, so that the centering precision is high;

the lateral pressure surface of the locking surface is an inclined surface, and the crown cutter head is firmly fixed and self-locked to prevent loosening in the use process; the bottom surface of the side pressure surface of the locking surface is in arc transition, so that stress concentration is prevented, and the centering cylindrical pin is prevented from being broken;

the L-shaped double-limiting-surface non-centrosymmetric design is used, the crown tool bit is effectively prevented from being locked and falling off due to the fact that the side pressure locking surface of the crown tool bit is wrongly installed, the positioning is reliable, large torque can be borne, the impact of external force of the centering circle of the crown tool bit is small, and the crown tool bit is not easy to break or wear; the L-shaped double limiting surfaces are designed by adopting a 90-degree included angle, the tooth crown cutter head has high structural strength, is suitable for processing various materials, has uniformly distributed radial force in cutting and processing, and has small processing vibration and long service life;

compared with the existing structure, the novel large-diameter large-torque precise machining tool is simple in structure, large in positioning contact area, good in rigidity, firm in locking, low in cost, very suitable for large-batch large-diameter large-torque precise machining, and has certain popularization value.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic perspective view of the drill rod of the present invention;

FIG. 3 is an enlarged view of a portion of the lateral side of FIG. 2 according to the present invention;

fig. 4 is a front view of a drill rod of the present invention;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4 in accordance with the present invention;

FIG. 6 is a schematic structural view of the compression screw of the present invention screwed into the fastening threaded hole;

FIG. 7 is a schematic structural view of the crown bit of the present invention fixed to the drill rod by a compression screw;

fig. 8-9 are schematic perspective views of the crown bit of the present invention;

figure 10 is the tooth crown tool bit of the utility model

Fig. 11 is a front view of the crown bit of the present invention;

fig. 12 is a side view of the crown bit of the present invention.

Detailed Description

The embodiments of the present invention are described in detail below to make the advantages and features of the present invention easier to understand by those skilled in the art, thereby making more clear and definite definitions of the protection scope of the present invention.

As shown in fig. 1-12, a round pin centering double-limit side pressure locking crown bit mainly plays a role in drilling and cutting and ensures the precision of a machined hole, the round pin centering double-limit side pressure locking crown bit (which may be simply referred to as a crown bit) is centered by a cylindrical pin 25, locked and installed on a drill rod 1 by a side pressure locking screw 3, the crown bit 2 consists of an assembly area 220 and a cutting area 221, the crown bit 2 consists of a cutting area 221 at the left end and an assembly area 220 at the right end, the assembly area 220 is provided with a guide cone 24, a cylindrical pin 25, an arc transition surface 26, a locking surface 27 and a bottom surface 28, the length of the guide cone 24 is 0.1-1mm, the taper is 30 degrees, the installation is convenient and the guiding function is played, the cutting area 221 is provided with a back 210, a cylindrical surface 211, an edge 212, an L-shaped double-limit surface, an inner edge 213 and a main edge 214, the cylindrical pin 25 is coaxial with the cylindrical pin 211, the bottom surface 28 is perpendicular to the central axis of the cylindrical pin 25, the locking surface 27 is arranged on the cylindrical pin 25, the lateral pressure surface of the locking surface 27 is an inclined surface, the included angle between the lateral pressure surface of the locking surface 27 and the central axis of the cylindrical pin 25 is 30-75 degrees, the bottom surface of the lateral pressure surface of the locking surface 27 is arc-shaped, the transition edge 215 is formed between the main edge 214 and the inner edge 213, the main edge 214, the inner edge 213 and the transition edge 215 are arranged at the front end (left end) of the chip groove 29, the solid part except the chip groove 29 on the cutting area 221 forms a back part 210, the intersection surface of the chip groove 29 and the back part 210 in the radial direction forms an edge 212, two sets of L-shaped double limiting surfaces comprise a first L-shaped double limiting surface 216 and a second L-shaped double limiting surface 217, the two sets of L-shaped double limiting surfaces are convenient to bear large torque and respectively correspond to and are matched with the L-shaped double limiting surfaces 9 on the two sides of the drill rod 1 one by one, the first L-shaped double limiting surface 216 and the second L-shaped double limiting surface 217 are arranged in a non-center symmetry mode, the eccentric distance 218 is 0.02-0.2mm, and the locking surface 27 is adopted, The two L-shaped double-limit surfaces realize limit positioning, and the positioning is more reliable.

As a specific implementation mode, the drill rod 1 comprises a working portion 4, a neck portion 5 and a handle portion 6 which are sequentially connected from left to right, the working portion 4, the neck portion 5 and the handle portion 6 form a coaxial cylinder structure by taking the same central axis as a center, a centering hole 10 is formed in the middle of the left end face in the working portion 4 and used for guaranteeing that the centering precision of the crown bit 2 is within 0.02mm, a cylindrical pin at the right end of the crown bit 2 extends into the cylindrical centering hole 10 matched with the cylindrical centering hole and is used for vertically screwing the crown bit 2 onto the drill rod 1 through a compression screw 3, the left end face of the working portion 4 forms a U-shaped structure, L-shaped double limiting faces 9 formed on the upper side and the lower side of the left end face of the working portion 4 are precisely matched with double limiting faces on the crown bit 2, and radial cutting force of the crown bit 2 is supported.

Work portion 4 is equipped with spiral helicine chip groove 7 and back of a knife blade 8, chip groove 7 plays the bits and chip removal effect at the during operation, the solid part that removes chip groove 7 on work portion 4 is back of a knife blade 8, main cooling hole 14 designs inside drilling rod 1, run through the inside of neck 5 and stalk portion 6, main cooling hole 14 is opened at the left end face of work portion 4 has two apopores 15, provide the coolant liquid for crown tool bit 2 at the during operation, two apopores 15 form Y type structure with main cooling hole 14.

A fastening threaded hole 16 and a counter bore 17 are arranged on one side face of the centering hole 10, the central axis of the counter bore 17 is not overlapped with the central axis of the fastening threaded hole 16 at the bottom, the eccentricity H is 0.02-0.1mm, and when the compression screw 3 is screwed into the fastening threaded hole 16, a certain friction force is generated between the compression screw and the counter bore 17 to fasten the crown bit 2.

The locking surface on the cylindrical pin of the crown bit 2 and the axis of the compression screw 3 are designed in a non-vertical mode to form an acute angle 20 on one side, the value range of the acute angle 20 is 70-88 degrees, when the compression screw 3 is locked, a radial circumferential thrust is automatically generated, the L-shaped double limiting surfaces 9 of the drill rod 1 are precisely attached to the double limiting surfaces on the crown bit 2, stable cutting is guaranteed, and the service life of a cutter is prolonged.

The L-shaped double limiting surfaces 9 on the upper side and the lower side of the left end surface of the drill rod 1 can adopt a non-centrosymmetric design idea, the center of the L-shaped double limiting surfaces and the centering hole 10 are eccentrically arranged, the eccentricity is 0.02-0.2mm, and the situation that the tool bit cannot be locked and fall off due to the installation error of the side pressure locking surface of the tool bit is effectively prevented.

The neck 5 is a combination formed by a cone at the left end and a cylinder at the right end, so that chips can be prevented from splashing and impacting the handle 6 and a machine tool spindle during working, a protection effect is achieved, the transition groove 11 above the neck 5 adopts circular arc transition, stress concentration is effectively reduced, and the strength of the drill rod 1 is increased.

The stalk portion 6 is a section of cylinder that the circle precision is higher, is convenient for install centering on the handle of a knife, and 6 tops of stalk portion are equipped with side pressure face 12, through handle of a knife side pressure screw fixed tooth crown drill bit during the use, can bear big moment of torsion cutting, and 6 right-hand members of stalk portion are equipped with decontamination groove 13, prevent effectively that tiny iron fillings from inserting into the 6 cylindrical surface of stalk portion, avoid influencing the clamping precision, and the inside main cooling hole 14 that sets up that runs through of axis along it of stalk portion 6 can convey the coolant liquid of lathe cooling system on the cutter.

The utility model discloses a manufacture process does:

during manufacturing, the cylindrical pin 25, the guide cone 24, the arc transition surface 26 and the cylindrical surface 211 are ground to form the bottom surface 28, the cylindrical pin 25 and the cylindrical surface 211 are on the same axis, the locking surface 27 and the bottom surface 28 are ground by taking the cylindrical pin 25 as a reference, the locking surface 27 is an inclined surface and an arc, the inclined surface and the central axis of the cylindrical pin 25 form a 30-75 degree angle, and the bottom surface 28 is perpendicular to the central axis of the cylindrical pin 25.

And grinding the first L-shaped double limiting surface 216 to enable the first L-shaped double limiting surface 216 and the second L-shaped double limiting surface 217 on two sides of the cutting area to be non-centrosymmetric, so that the situation that the tool bit cannot be locked and fall off due to installation errors of the tool bit side pressure locking surface 27 is avoided, the chip groove 29 is ground, and the helical angle a of the chip groove 29 is 0-35 degrees.

Grinding a main edge 214 and an inner edge 213, forming a transition edge 215 between the main edge 214 and the inner edge 213, wherein the length of the inner edge 213 is 1/4-1/2 of the length of the main edge 214, and the arc size of the transition edge 215 is R0.1-3 mm.

During assembly, the cylindrical pin of the crown cutter head 2 extends into the centering hole 10, and the compression screw 3 is screwed into the counter bore 17, the fastening threaded hole 16 and the centering hole 10 until the crown cutter head 2 is tightly fixed on the cutter bar 1.

The utility model discloses the part of not specifically describing adopt prior art or product can, do not do here and describe repeatedly.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A round pin centering double-limit side pressure locking tooth crown cutter head is characterized by consisting of an assembly area and a cutting area, the assembly area is provided with a guide cone, a cylindrical pin, an arc transition surface, a locking surface and a bottom surface, the cutting area is provided with a back part, an edge, a cylindrical surface, an L-shaped double limiting surface, a main edge and an inner edge, the cylindrical pin is coaxial with the cylindrical surface, the bottom surface is vertical to the central axis of the cylindrical pin, the locking surface is arranged on the cylindrical pin, the side pressing surface of the locking surface is an inclined surface, the bottom surface of the side pressing surface of the locking surface is arc-shaped, the L-shaped double limiting surfaces are arranged in two groups and are not centrosymmetrically, the transition edge is formed between the main edge and the inner edge, the main edge, the inner edge and the transition edge are arranged at the front end of a chip groove, the solid part except the chip groove on the cutting area forms the back part, and the chip groove and the intersecting surface of the back part in the radial direction form the edge, the round pin centering double-limit side pressure locking crown tool bit is centered through the cylindrical pin and detachably mounted on the drill rod.

2. The round pin centering double-limit side pressure locking crown bit as claimed in claim 1, wherein the length of the guide cone is 0.1-1mm, and the taper is 30 °.

3. The circular pin centering double-limit side pressure locking crown bit according to claim 1, wherein the angle between the side pressure surface of the locking surface and the central axis of the cylindrical pin is 30-75 °.

4. The round pin centering double-limit side pressure locking crown bit according to claim 1, wherein the two sets of L-shaped double-limit surfaces are a first L-shaped double-limit surface and a second L-shaped double-limit surface respectively, and the eccentricity is 0.02-0.2 mm.

5. The round pin centering double-limit side pressure locking crown bit as claimed in claim 1, wherein the length of the inner edge is 1/4-1/2 of the length of the main edge.

6. The round pin centering double-limit side pressure locking crown bit according to claim 1, wherein the arc size of the transition edge is R0.1-3 mm.

7. The round pin centering double-limit side pressure locking crown cutter head as claimed in claim 1, wherein the helix angle of the chip groove is 0-35 °.