CN108927573B - a chamfering tool - Google Patents

Abstract

The invention relates to a chamfering tool. The chamfering tool includes a cutter head, the cutter head includes a chamfering cutting edge, and the chamfering cutter further includes a positioning member 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 member is a first positioning portion arranged coaxially with the rotation axis of the cutter head, and the lower end is a second positioning portion used for coaxial positioning and matching with the center hole or outer circumferential surface of the part to be processed. The part and the second positioning part are arranged coaxially. The chamfering tool in the present invention ensures that the axis of rotation of the tool head is coaxial with the axis of the part to be processed through the positioning member, so that the size of the chamfered chamfer is uniform, and avoids the inclination of the axis of rotation of the tool head during the chamfering process. The problem that caused the chamfer to fail.

Description

a chamfering tool

technical field

The invention relates to a chamfering tool.

Background technique

Chamfering the edge of tubular cylindrical parts is a relatively common process in parts processing. For some tubular cylindrical parts assembled on large parts, it cannot be realized by lathe chamfering. The head is equipped with a portable chamfering tool for chamfering.

The Chinese utility model patent with the authorization announcement number CN205764222U discloses a composite tool, the composite tool includes a tool handle and a tool head, the end of the tool head has a machining blind hole, and the tool head is provided with a radial connection with the machining blind hole. The spacer divides the cutter head into four solid parts evenly distributed in the circumferential direction. The outer peripheral surface of each solid part and the inner wall of the hole bottom of the blind hole are respectively provided with an inner cutting edge and an outer cutting edge. The edges are used for machining inner and outer chamfers, respectively.

When the above-mentioned composite tool is used to chamfer the outer circumference of the part to be machined, the requirements for the operator are relatively high, and it is difficult to ensure that the tool will not tilt. Once the tool is tilted, the outer circumference will be chamfered unevenly. corner failed. When the outer circumference of the part to be processed is a standard circumference, it is still difficult to ensure that the axis of rotation of the tool is coaxial with the part, while for the part to be processed whose outer circumference is a non-standard circumference, such as a tubular cylindrical part fixed on a large workpiece , as shown in Figure 1, the tubular cylindrical part 1 is fixed on the large workpiece 9. Due to process requirements, a gap 10 is machined at the top of the tubular cylindrical part 1, so that the outer circumference of the tubular cylindrical part 1 is a non-standard circumference , when the above-mentioned composite tool is used for chamfering, it is more difficult to ensure that the axis of rotation of the tool head is coaxial with the axis of the part to be machined, thereby causing chamfering failure.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a chamfering tool to solve the technical problem in the prior art that the rotation axis of the tool tends to be inclined during chamfering, thereby causing chamfering failure.

For achieving the above object, the technical scheme of the present invention is:

A chamfering tool includes a cutter head, the cutter head includes a chamfering cutting edge, the chamfering cutter further includes a positioning piece, the upper end of the positioning piece is a first positioning portion coaxially arranged with the rotation axis of the cutter head, and the lower end The first positioning portion and the second positioning portion are coaxially arranged as a second positioning portion for coaxial positioning and matching with the center hole or the outer circumferential surface of the part to be processed.

The positioning member is rotatably matched with the cutter head.

The positioning member has a positioning reference surface for positioning and matching with the top end face 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 member is used for positioning and matching with the central hole of the part to be machined.

The positioning member is a positioning rod. The positioning rod includes an upper rod section, a lower rod section and a positioning boss located between the upper rod section and the lower rod section. The upper rod section constitutes a first positioning part, and the lower rod section The second positioning portion is constituted, and the lower end surface of the positioning boss constitutes the positioning reference surface.

An installation hole is coaxially provided on the cutter head, and the lower rod section of the positioning rod is rotated and assembled in the installation hole through a bearing.

The chamfering cutting edge is used for chamfering the outer circumference of the part to be machined, the cutter head is an integral structure, and the cutter head includes a cutting portion with the chamfering cutting edge.

The cutting parts are distributed at intervals around the circumference, and each cutting part is inclined counterclockwise or clockwise around the rotation axis of the cutter head.

A spacer groove is formed between two adjacent cutting parts, and the opposite two side walls of the spacer groove respectively constitute the rake face and the auxiliary flank face of the two adjacent cutting parts, and the inner side of each cutting part has a flank, a rake face and a flank. The intersecting line of the blade faces forms a blade edge, and the flank faces are inclined from top to bottom toward the outer side of the cutter head, so that the lower end of the cutter head is in a flared structure.

The outer side of the cutting portion has an inclined surface inclined toward the inner side of the cutter head from top to bottom, and the intersection of the inclined surface and the rake face and the flank forms a cutting edge.

The beneficial effects of the present invention are: the cutter head of the chamfering tool in the present invention has a chamfering cutting edge for chamfering, the chamfering cutter further comprises a positioning piece, and the upper end of the positioning piece is arranged coaxially with the rotation axis of the cutter head The first positioning part, the lower end is to penetrate into the center hole of the part to be processed and coaxial with the center hole during chamfering, or to be the same as the outer circumferential surface of the part to be processed from the outside of the part to be processed during chamfering The second positioning part of the shaft positioning and matching, the first positioning part and the second positioning part are coaxially arranged, thereby ensuring that the rotation axis of the tool head is coaxial with the axis of the part to be processed, and under the positioning action of the positioning part, the processed The size of the chamfer is uniform, which avoids the problem of chamfering failure due to the inclination of the rotation axis of the cutter head during the chamfering process.

Description of drawings

1 is a schematic structural diagram of a tubular cylindrical part fixed on a large-scale product in the background;

Fig. 2 is the use state diagram of an embodiment of the chamfering tool of the present invention;

3 is a schematic cross-sectional view of a cutter body of an embodiment of the chamfering cutter of the present invention;

Fig. 4 is the left side view of Fig. 3;

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

Detailed ways

The embodiments of the present invention will be further described below with reference to the accompanying drawings.

The specific embodiment 1 of a chamfering tool of the present invention, as shown in FIGS. 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 formed by a tool head 51 . It is composed of a handle 52 located at the upper end of the cutter head. The handle 52 is used for assembling and connecting with the output shaft of the electric hand drill, and is used for realizing portable chamfering with the electric hand drill. The cutter head 51 and the cutter handle 52 are integrally formed. The cutter head 51 includes a cutting portion 511 with a chamfered cutting edge. The chamfered cutting edge of the cutting portion 511 is used for chamfering the outer circumference of the part 1 to be processed. This embodiment Among them, there are four cutting parts 511, and they are evenly spaced around the circumference of the cutter head.

The positioning member 2 is a positioning rod. A mounting hole 53 with an opening facing downward is formed inside the cutter head 51 , and the positioning rod is rotatably installed 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 small-diameter hole section 531 is sequentially installed with the sleeve 4 and the bearing 3 , the outer ring of the bearing 3 and the inner wall of the small-diameter hole section 531 Fixed, the upper end of the positioning rod is fixedly installed in the inner ring of the bearing 3 , and the positioning rod is rotated and installed in the installation hole 53 through the bearing 3 . The positioning rod includes an upper rod section 22, a lower rod section 21 and a positioning boss 23 located between the upper rod section and the lower rod section. The upper rod section 22 of the positioning rod is rotatably installed in the cutter head 51 through the bearing 3 , the upper rod segment 22 constitutes a first positioning portion coaxial with the rotational axis of the cutter head. The lower rod section 21 of the positioning rod penetrates into the center hole of the part to be processed during chamfering, and is coaxially positioned and matched with the center hole of the part to be processed. The hole is coaxially positioned and matched with the second positioning portion. The lower end face 231 of the positioning boss 23 is positioned and matched with the top end face of the part to be machined during chamfering, thereby limiting the height of the cutter head 51 relative to the part to be machined, ensuring a fixed size of the chamfer, and adjusting the positioning by replacing different positioning rods The height of the boss can adjust the size of the chamfer; the lower end surface 231 of the positioning boss constitutes a positioning reference surface for positioning and matching with the top end face of the part to be processed. In this embodiment, the lower end of the upper rod segment 22 is rounded to form a diameter-reducing portion 211 with a gradually decreasing radius, and the positioning rod penetrates into the interior of the part to be processed.

When the chamfering tool in the present invention is in use, the lower rod section 21 of the positioning rod is inserted into the center hole of the part 1 to be processed, and the lower end face of the positioning boss 23 is positioned and matched with the top end face of the part 1 to be processed. The outer circumferences of the parts 1 to be machined are respectively chamfered for each cutting part. Since the positioning rod and the cutter head rotate together, during the chamfering process, the cutter head 51 rotates relative to the part 1 to be machined, and the positioning rod is fixed relative to the part to be machined 1 to avoid wear between the positioning rod and the center hole of the part to be machined. Since the lower rod section of the positioning rod is coaxially positioned and matched with the part to be processed, the upper rod section is coaxial with the rotation axis of the cutter head, thereby ensuring the coaxiality of the rotation axis of the cutter head and the part to be processed, and achieving uniform chamfer size. Avoid the phenomenon of chamfering failure caused by the tilting and swinging of the cutter head. When in use, the positioning rod can be replaced as required, and the size of the chamfer can be adjusted by changing the positioning bosses of different heights.

In this embodiment, the cutter head 51 is an integral structure, and the four cutting portions 511 are separated by a partition groove 55 which is opened at the lower end of the cutter head 51 and communicates with the large-diameter hole section 532 in a radial direction. The partition groove 55 constitutes two adjacent two Chip flutes between the cutting parts 511 . The opposite two side walls of the partition groove 55 constitute the rake face 512 and the auxiliary flank face 514 of the adjacent two cutting portions 511 respectively. The inner side of each cutting portion 511 has a flank face 513. The line of intersection forms a chamfered cutting edge 515 . The four cutting portions 511 are inclined counterclockwise around the circumferential direction of the cutter head, and an avoidance space 54 for avoiding the notch 10 on the part to be machined is formed between the lower ends of two adjacent cutting portions. When the chamfering tool is butted with the part to be processed, the avoidance space 54 between two adjacent cutting parts can effectively avoid the notch 10 on the part to be processed. And during the chamfering process, at least three cutting parts are always kept in contact with the outer circumference of the part to be machined, so that a three-point stable support is formed between the cutter head and the part to be machined, and the cutter head is not easy to tilt and swing, so as to ensure that the cutter head is in contact with the workpiece. Concentricity of the part to be machined.

The plane perpendicular to the rotation axis of the cutter head 51 is the base surface 56, the angle between the rake face 512 and the base surface 56 is the rake angle a, and the rake angle a ranges from 60° to 90°, and the smaller the rake angle is , the sharper the blade, but the strength of the blade will decrease accordingly, the preferred rake angle a is 75°, on the premise of ensuring the sharpness of the blade, ensure that the blade strength is large enough. The included angle between the auxiliary flank surface 514 and the base surface is the auxiliary relief angle b, preferably the auxiliary relief angle b is 72° to improve the strength of the blade. The flank surface 513 is gradually inclined to the outside from top to bottom, so that the lower end of the cutter head has a flared structure, which can chamfer parts to be machined with different diameters and increase the scope of application. The included angle c between the flank face 513 and the axis of the cutter head is 45°, which ensures that the processed chamfer angle is 45°. The relief angle of the cut portion is 15° (not shown in the figure). The outer side of the cutting part has an inclined surface 517 inclined toward the inside of the cutter head from top to bottom. The intersection of the inclined surface 517 with the rake surface 512 and the flank surface 513 forms a tool tip 518. Tip strength; the angle d between the inclined surface 517 and the axis of the cutter head is preferably 10°. If there is no inclined surface, the thickness of the cutter tip position is small, the wall is thin, and the strength is low, and the cutter tip is used for wear during use. The angle e between the intersection line 516 of the flank 513 and the auxiliary flank 514 and the connecting line 58 relative to the centers of the two cutting parts is 25°, which is conducive to chip removal on the one hand, and reduces the chamfering of the tool tip. vibrations, reducing performance roughness.

In other embodiments of the present invention, the number of cutting parts may be less than four or more than four. The cutting part on the cutter head may also be an inner chamfering insert for machining inner chamfering, or the cutter head has both an inner chamfering insert and an outer chamfering insert. The cutter head may not be an integral structure, for example, the cutter head includes a cutter head body, the cutting portion is an independent cutting tool, and the cutting cutter is fixed on the cutter head body through a cutter holder. The positioning member can also be a positioning sleeve arranged outside the cutter head. When in use, the positioning sleeve is coaxially positioned and matched with the outer circumference of the part to be processed. The positioning piece can also be fixed on the cutter head, and when chamfering, the positioning piece rotates relative to the part to be processed. The positioning boss may not be set on the positioning rod, and the positioning reference surface is set on the cutter head. For example, the positioning reference surface can be the end face of the lower hole of the small diameter hole segment. When chamfering, the lower hole end face of the small diameter hole segment and the top end face of the part to be processed Positioning fit. Alternatively, the positioning reference plane can be omitted, and the size of the chamfer can be controlled by the operator's visual inspection when machining the chamfer. In this embodiment, the positioning member and the cutter head are arranged coaxially. In other embodiments, the positioning member and the cutter head may not be coaxial, and it is only necessary to ensure that one end of the positioning member is coaxially matched with the cutter head, and the other end is coaxial with the part to be processed. The shaft matching can satisfy the coaxiality between the cutter head and the part to be machined. The positioning rod can also be fixedly connected with the cutter head or the positioning rod is a part of the cutter head.

Claims (2)

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.

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