CN108927573B

CN108927573B - Chamfering tool

Info

Publication number: CN108927573B
Application number: CN201710378916.4A
Authority: CN
Inventors: 杨保利; 吴明清; 侯国良; 高威昊; 程丙勋; 张亚朋; 任翔
Original assignee: State Grid Corp of China SGCC; State Grid Zhejiang Electric Power Co Ltd; Pinggao Group Co Ltd; Henan Pinggao Electric Co Ltd
Current assignee: State Grid Corp of China SGCC; State Grid Zhejiang Electric Power Co Ltd; Pinggao Group Co Ltd; Henan Pinggao Electric Co Ltd
Priority date: 2017-05-25
Filing date: 2017-05-25
Publication date: 2020-10-23
Anticipated expiration: 2037-05-25
Also published as: CN108927573A

Abstract

The invention relates to a chamfering tool, which comprises a tool bit, wherein the tool bit comprises a chamfering cutting edge, the chamfering tool also comprises a positioning piece used for positioning and matching with a central hole or an outer circumferential surface of a part to be machined, the upper end of the positioning piece is a first positioning part coaxially arranged with a rotation axis of the tool bit, the lower end of the positioning piece is a second positioning part coaxially positioned and matched with the central hole or the outer circumferential surface of the part to be machined, and the first positioning part and the second positioning part are coaxially arranged. According to the chamfering tool, the positioning piece ensures that the rotating axis of the tool bit is coaxial with the axis of the part to be machined, so that the machined chamfer is uniform in size, and the problem of chamfer failure caused by inclination of the rotating axis of the tool bit in the chamfering process is solved.

Description

Chamfering tool

Technical Field

The invention relates to a chamfering tool.

Background

Chamfering processing is carried out on the edge of the tubular cylindrical part, the process is a common process in part processing, chamfering cannot be realized by adopting a lathe for some tubular cylindrical parts assembled on large-sized parts, and a portable chamfering tool is usually installed at the head of an electric hand drill for chamfering under the condition.

The patent of chinese utility model with the publication number of grant CN205764222U discloses a compound tool, and this compound tool includes handle of a knife and tool bit, and the tip of tool bit has the processing blind hole, seted up on the tool bit with the radial intercommunication of processing blind hole separates the groove, separates four entity parts of groove with the tool bit segmentation circumference equipartition, is equipped with interior cutting edge and outer cutting edge on the outer peripheral face of each entity part and on the hole bottom inner wall of processing blind hole respectively, and interior, outer cutting edge is used for processing interior circumference chamfer and outer circumference chamfer respectively.

When the composite cutter is used for chamfering the outer circumference of a part to be machined, the requirement on operators is high, the cutter cannot be inclined, and once the cutter inclines, the chamfering of the outer circumference is uneven, so that the chamfering failure is caused. For a part to be machined with an external circumference of a standard circumference, it is difficult to ensure that the rotation axis of the tool is coaxial with the part, and for a part to be machined with an external circumference of a non-standard circumference, for example, a tubular cylindrical part fixed on a large-sized part, as shown in fig. 1, the tubular cylindrical part 1 is fixed on the large-sized part 9, due to process requirements, a notch 10 is machined at the top end of the tubular cylindrical part 1, so that the external circumference of the tubular cylindrical part 1 is a non-standard circumference, and when the composite tool is used for chamfering, it is more difficult to ensure that the rotation axis of the tool bit is coaxial with the axis of the part to be machined, and further chamfering.

Disclosure of Invention

The invention aims to provide a chamfering tool, which is used for solving the technical problem that the rotation axis of the tool is easy to incline to cause chamfering failure in chamfering in the prior art.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the utility model provides a chamfering tool, includes the tool bit, and the tool bit includes the chamfer cutting edge, and this chamfering tool still includes the setting element, the upper end of setting element be with the first location portion of the coaxial setting of the axis of rotation of tool bit, the lower extreme be for be used for with treat the centre bore of processing part or outer periphery coaxial positioning complex second location portion, first location portion and the coaxial setting of second location portion.

The positioning piece is in running fit with the cutter head.

The positioning piece is provided with a positioning datum plane which is used for positioning and matching with the end face of the top end of the part to be processed.

The chamfer cutting edge is used for chamfering the outer circumference of the part to be machined, and the positioning piece is used for being matched with the center hole of the part to be machined in a positioning mode.

The locating piece is the locating lever, and the locating lever includes upper boom section, lower boom section and the location boss that is located between upper boom section and the lower boom section of coaxial setting, and the upper boom section constitutes first location portion, and the lower boom section constitutes second location portion, and the lower terminal surface of location boss constitutes location reference surface.

The cutter head is coaxially provided with a mounting hole, and the lower rod section of the positioning rod is rotatably assembled in the mounting hole through a bearing.

The chamfer cutting edge is used for chamfering the outer circumference of the part to be machined, the tool bit is of an integral structure, and the tool bit comprises a cutting part with the chamfer cutting edge.

The cutting parts are distributed at intervals around the circumferential direction, and each cutting part is obliquely arranged around the rotating axis of the cutter head anticlockwise or clockwise.

Form the separating groove between two adjacent cutting portions, the relative both sides wall of separating groove constitutes the rake face and the vice back knife face of two adjacent cutting portions respectively, and the inboard of each cutting portion has the back knife face, and the intersect of rake face and back knife face forms the cutting edge, the back knife face sets up so that from last outside slope to the tool bit down the tool bit lower extreme is flaring structure.

The outside of cutting portion has the inclined plane of the inboard slope of tool bit from top to bottom, the crossing point of inclined plane and rake face and back knife face forms the knife tip.

The invention has the beneficial effects that: the tool bit of the chamfering tool is provided with a chamfering cutting edge for chamfering, the chamfering tool also comprises a positioning piece, the upper end of the positioning piece is a first positioning part which is coaxially arranged with the rotation axis of the tool bit, the lower end of the positioning piece is a second positioning part which penetrates into the center hole of the part to be machined and is coaxially positioned and matched with the center hole during chamfering, or is coaxially positioned and matched with the outer circumferential surface of the part to be machined from the outside of the part to be machined during chamfering, the first positioning part and the second positioning part are coaxially arranged, so that the rotation axis of the tool bit is ensured to be coaxial with the axis of the part to be machined, the machined chamfer is uniform in size under the positioning action of the positioning piece, and the problem that the chamfer fails due to the inclination of the rotation axis of the tool.

Drawings

FIG. 1 is a schematic structural diagram of a tubular cylindrical part fixed on a large-sized object in the prior art;

FIG. 2 is a view illustrating a state of use of an embodiment of the chamfering tool according to the present invention;

FIG. 3 is a schematic cross-sectional view of a body of one embodiment of the chamfering tool of the present invention;

FIG. 4 is a left side view of FIG. 3;

fig. 5 is a schematic structural diagram of a positioning rod of an embodiment of the chamfering tool of the present invention.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

In embodiment 1 of the chamfering tool of the present invention, as shown in fig. 2 to 5, the chamfering tool includes a tool body 5 and a positioning member 2 rotatably mounted on the tool body, the tool body 5 is composed of a tool bit 51 and a tool shank 52 located at an upper end of the tool bit, and the tool shank 52 is used for being assembled and connected with an output rotating shaft of an electric hand drill, and is used for realizing portable chamfering in cooperation with the electric hand drill. The cutting head 51 and the tool holder 52 are integrally formed, the cutting head 51 comprises a cutting part 511 with chamfering cutting edges, the chamfering cutting edges of the cutting part 511 are used for chamfering the outer circumference of the part 1 to be machined, in the embodiment, four cutting parts 511 are arranged, and are uniformly distributed at intervals around the circumferential direction of the cutting head.

The positioning member 2 is a positioning rod, a mounting hole 53 with a downward opening is formed in the tool bit 51, and the positioning rod is rotatably mounted in the mounting hole 53. In this embodiment, the mounting hole 53 is stepped and includes a large-diameter hole section 532 and a small-diameter hole section 531, the sleeve 4 and the bearing 3 are sequentially installed in the small-diameter hole section 531, the outer ring of the bearing 3 is fixed to the inner wall of the small-diameter hole section 531, the upper end of the positioning rod is fixedly installed in the inner ring of the bearing 3, and the positioning rod is rotatably installed in the mounting hole 53 through the bearing 3. The positioning rod comprises an upper rod section 22, a lower rod section 21 and a positioning boss 23, wherein the upper rod section 22 and the lower rod section are coaxially arranged, the positioning boss 23 is positioned between the upper rod section and the lower rod section, the upper rod section 22 of the positioning rod is rotatably arranged in the cutter head 51 through the bearing 3, and the upper rod section 22 forms a first positioning part which is coaxial with the rotation axis of the cutter head. The lower rod section 21 of the positioning rod penetrates into a central hole of the part to be machined during chamfering and is in coaxial positioning fit with the central hole of the part to be machined, and the lower rod section 21 forms a second positioning part which is used for being in coaxial positioning fit with the central hole of the part to be machined. The lower end surface 231 of the positioning boss 23 is in positioning fit with the top end surface of the part to be machined during chamfering, so that the height of the tool bit 51 relative to the part to be machined is limited, the chamfer is guaranteed to be fixed in size, and the height of the positioning boss is adjusted by replacing different positioning rods, so that the size adjustment of the chamfer is realized; the lower end surface 231 of the positioning boss forms a positioning reference surface for positioning and matching with the top end surface of the part to be processed. In this embodiment, the lower end of the upper rod section 22 is rounded to form a reducing portion 211 with a gradually decreasing radius, and the positioning rod penetrates into the part to be machined.

When the chamfering tool is used, the lower rod section 21 of the positioning rod penetrates into a central hole of the part 1 to be machined, the lower end face of the positioning boss 23 is matched with the end face of the top end of the part 1 to be machined in a positioning mode, and the four cutting parts are used for performing excircle chamfering on the outer circumference of the part 1 to be machined respectively. Because the locating rod is in running fit with the tool bit, in the chamfering process, the tool bit 51 rotates relative to the part 1 to be machined, and the locating rod is fixed relative to the part 1 to be machined, so that abrasion between the locating rod and a central hole of the part to be machined is avoided. Because the lower pole section of locating lever and the coaxial location cooperation of part of waiting to process, the axis of rotation of upper pole section and tool bit is coaxial, and then has guaranteed the axiality of tool bit axis of rotation and the part of waiting to process, realizes that the chamfer size is even, avoids causing the phenomenon of chamfer failure because of the tool bit slope swing appears. When the chamfering device is used, the positioning rod can be replaced as required, and the size of the chamfering is adjusted by changing the positioning bosses with different heights.

In this embodiment, the cutting head 51 is of an integral structure, the four cutting portions 511 are separated by partition grooves 55 formed at the lower end of the cutting head 51 and radially communicated with the large-diameter hole section 532, and the partition grooves 55 form chip discharge grooves between the two adjacent cutting portions 511. The opposite side walls of the partition groove 55 respectively constitute a rake surface 512 and a minor flank surface 514 of the adjacent two cutting portions 511, the inside of each cutting portion 511 has a flank surface 513, and the intersection line of the rake surface 512 and the flank surface 513 forms a chamfer cutting edge 515. The four cutting portions 511 are arranged in an anticlockwise inclined manner around the circumferential direction of the cutter head, and an avoiding space 54 which can avoid the notch 10 on the part to be machined is formed between the lower end portions of the two adjacent cutting portions. When the chamfering tool is butted with a part to be machined, the avoiding space 54 between the two adjacent cutting parts can effectively avoid the notch 10 on the part to be machined. And in the chamfering process, at least three cutting parts are always kept to be in contact fit with the periphery of the part to be machined, so that three-point stable supporting fit is formed between the tool bit and the part to be machined, the tool bit is not easy to tilt and swing, and the coaxiality of the tool bit and the part to be machined is ensured.

Assuming that a plane perpendicular to the rotation axis of the tool bit 51 is the base surface 56, an included angle between the rake surface 512 and the base surface 56 is a rake angle a, the rake angle a ranges from 60 ° to 90 °, the smaller the rake angle is, the sharper the cutting edge is, but the strength of the blade is reduced, preferably, the rake angle a is 75 °, and the strength of the blade is ensured to be sufficiently high on the premise that the cutting edge is sharp. The angle between the secondary relief surface 514 and the base surface is a secondary relief angle b, preferably 72 °, which increases the strength of the insert. The back knife face 513 is inclined from top to bottom gradually towards the outside, so that the lower end of the cutter head is of a flaring structure, chamfering of parts to be machined with different diameters can be achieved, and the application range is improved. The included angle c between the rear cutter face 513 and the axis of the cutter head is 45 degrees, and the machined chamfer angle is ensured to be 45 degrees. The relief angle of the cutting portion is 15 ° (not shown in the figure). The outer side of the cutting part is provided with an inclined surface 517 which inclines towards the inner part of the tool bit from top to bottom, a tool nose 518 is formed by the intersection point of the inclined surface 517 and the front tool surface 512 and the rear tool surface 513, and the inclined surface 517 can increase the included angle of the tool nose of the blade and increase the strength of the tool nose; preferably, the included angle d between the inclined surface 517 and the axis of the cutter head is 10 degrees, if no inclined surface exists, the thickness of the cutter point is small, the wall is thin, the strength is low, and the cutter point is used for abrasion in the using process. The included angle e between the intersection line 516 of the flank surface 513 and the minor flank surface 514 and the connecting line 58 of the centers of the two opposite cutting parts is 25 degrees, so that on one hand, chip removal is facilitated, and meanwhile, the vibration of the tool nose during chamfering is reduced, and the roughness is reduced.

In other embodiments of the present invention, the number of the cutting portions may be less than four, or may be greater than four. The cutting part on the tool bit can also be an inner circle chamfering blade for processing an inner circle chamfer, or the tool bit is provided with the inner circle chamfering blade and an outer circle chamfering blade simultaneously. The cutting head may also be of a non-unitary construction, such as the cutting head including a head body, the cutting portion being a separate cutting tool secured to the head body by a tool holder. The positioning piece can also be a positioning sleeve arranged outside the tool bit, and when the positioning piece is used, the positioning sleeve is coaxially positioned and matched with the outer circumference of the part to be machined. The positioning piece can also be fixed on the cutter head, and when chamfering is carried out, the positioning piece rotates relative to the part to be processed. The positioning boss can not be arranged on the positioning rod, the positioning reference surface is arranged on the cutter head, if the positioning reference surface can be the lower hole end surface of the small-diameter hole section, and during chamfering, the lower hole end surface of the small-diameter hole section is in positioning fit with the top end surface of the part to be machined. Or the positioning reference surface is omitted, and the size of the chamfer is controlled by visual inspection of an operator during chamfer machining. In this embodiment, setting element and the coaxial setting of tool bit, in other embodiments, the setting element can with the tool bit disalignment, only need to guarantee the one end and the coaxial cooperation of tool bit of setting element, the other end with treat that the coaxial cooperation of processing part can satisfy the tool bit and treat that the processing part is coaxial. The locating rod can also be fixedly connected with the cutter head or the locating rod belongs to one part of the cutter head.

Claims

1. The utility model provides a chamfering tool, includes the tool bit, and the tool bit includes chamfer cutting edge, its characterized in that: the chamfering tool also comprises a positioning piece, wherein the upper end of the positioning piece is a first positioning part which is coaxially arranged with the rotation axis of the tool bit, the lower end of the positioning piece is a second positioning part which is coaxially matched with the central hole of the part to be machined in a positioning way, and the first positioning part and the second positioning part are coaxially arranged; the positioning piece is in rotating fit with the cutter head; the positioning piece is provided with a positioning reference surface which is used for positioning and matching with the end surface of the top end of the part to be processed; the chamfering cutting edge is used for chamfering the outer circumference of the part to be machined, and the positioning piece is used for positioning and matching with the central hole of the part to be machined; the positioning part is a positioning rod, the positioning rod comprises an upper rod section, a lower rod section and a positioning boss, the upper rod section and the lower rod section are coaxially arranged, the positioning boss is positioned between the upper rod section and the lower rod section, the upper rod section forms a first positioning part, the lower rod section forms a second positioning part, and the lower end face of the positioning boss forms the positioning reference face; the cutter head is coaxially provided with a mounting hole, an upper rod section of the positioning rod is rotatably assembled in the mounting hole through a bearing, the cutter head is of an integral structure and comprises a cutting part with a chamfer cutting edge, the interior of the cutter head is provided with the mounting hole with a downward opening, the mounting hole is in a step shape and comprises a large-diameter hole section and a small-diameter hole section, a sleeve and a bearing are sequentially arranged in the small-diameter hole section, and the positioning rod is rotatably installed in the mounting hole through the bearing; each cutting part is formed by separating a separation groove which is arranged at the lower end of the cutter head and is communicated with the large-diameter hole section in the radial direction, the separation groove forms a chip removal groove between two adjacent cutting parts, two opposite side walls of the separation groove respectively form a front cutter face and an auxiliary rear cutter face of the two adjacent cutting parts, the inner side of each cutting part is provided with a rear cutter face, and the intersection line of the front cutter face and the rear cutter face forms the chamfer cutting edge; the cutting parts are distributed at intervals in the circumferential direction, each cutting part is arranged around the anticlockwise or clockwise inclination of the rotation axis of the cutter head, and the rear cutter face is arranged from top to bottom towards the outer side of the cutter head in an inclined mode so that the lower end of the cutter head is of a flaring structure.

2. The chamfer tool of claim 1, wherein: the outside of cutting portion has the inclined plane of the inboard slope of tool bit from top to bottom, the crossing point of inclined plane and rake face and back knife face forms the knife tip.