CN220805596U - Boring cutter suitable for step hole - Google Patents

Abstract

The utility model relates to the technical field of machining tools, in particular to a boring tool suitable for stepped holes, which comprises a tool shank and a tool body which is fixedly integrated with the tool shank, wherein the tool body is provided with a first plane, a second plane, a third plane, a fourth plane, a first local spherical surface and a second local spherical surface, the spherical centers of the first local spherical surface and the second local spherical surface fall on the axis of the tool shank, the middle parts of the first local spherical surface and the second local spherical surface are provided with clearance grooves along the circumferential direction, a first blade and a second blade are fixedly arranged on the upper edge and the lower edge of the clearance grooves respectively, and a third blade is fixedly arranged on the second plane and at the lower edge of the clearance grooves correspondingly. Compared with the prior art, the utility model effectively improves the production efficiency, replaces a plurality of cutters with one cutter, omits the processing procedure, greatly shortens the processing time and can bring considerable economic benefit for mass production.

Description

Boring cutter suitable for step hole

Technical Field

The utility model relates to the technical field of machining tools, in particular to a boring tool applicable to stepped holes.

Background

In the case of manufacturing a large machine housing, there are many mounting holes in the housing, which are stepped holes 100 with large inner and small outer sides as shown in fig. 1, and it is necessary to perform boring processing of a small round surface 101 and a large round surface 102 and chamfering of the junction between the large round surface 102 and an inner end surface 103. Most of the existing processing modes adopt the mode of separating the front surface and the back surface for processing, or the processing is finished by a plurality of cutters and a plurality of working procedures, the process is troublesome, and the efficiency is low.

Disclosure of utility model

In order to simplify the process and improve the efficiency, the utility model discloses a boring cutter suitable for stepped holes, which adopts the following technical scheme:

The boring cutter comprises a cutter handle and a cutter body which is fixedly integrated with the cutter handle, and is different from the prior art in that the cutter body is provided with a plane I and a plane II, wherein an extension surface passes through the axis of the cutter handle, and a plane III and a plane IV which are respectively orthogonal with the plane I and the plane II, the outer ends of the plane I and the plane III are connected through a local spherical surface I, the outer ends of the plane II and the plane IV are connected through a local spherical surface II, the spherical centers of the local spherical surface I and the local spherical surface II fall on the axis of the cutter handle, and the distances between other parts of the cutter body except the local spherical surface I and the local spherical surface II and the axis of the cutter handle are smaller than the radius of the local spherical surface I or the local spherical surface II; the middle parts of the first partial sphere and the second partial sphere are provided with clearance grooves along the circumferential direction, and the width of the clearance grooves is larger than the thickness of the workpiece; the first blade and the second blade are respectively and fixedly arranged on the upper edge and the lower edge of the corresponding clearance groove on the first plane, the third blade is fixedly arranged on the lower edge of the corresponding clearance groove on the second plane, and the maximum radial width of the cutter body outline is smaller than the aperture of a blank of the workpiece.

Further, the cutter body is provided with a plane five and an arc surface, the plane five is parallel to the plane one and is respectively arranged at two sides of the axis of the cutter handle, the arc surface is connected with the plane five and the plane four, and the circle center of the arc surface is positioned at the opposite side of the axis of the cutter handle.

Further, the included angle between the first plane and the second plane is 60 degrees.

Further, the cross-sectional profile of the clearance groove comprises a transverse line positioned above, a oblique line positioned below, and a vertical line connecting the transverse line and the oblique line, wherein the included angle between the oblique line and the vertical line is 135 degrees, and the edge part of the blade III is parallel to the oblique line.

Further, the type of the first blade, the second blade and the third blade is CCMT120408, and the middle part is provided with a fixing hole; the first plane and the second plane are provided with blade mounting grooves corresponding to the first blade, the second blade or the third blade, and chip grooves and screw holes are formed in the blade mounting grooves; the fixing screw passes through the fixing hole and then is in threaded connection with the screw hole on the blade mounting groove.

Further, a side fixing plane is axially formed on the cutter handle so as to be fastened with a rotating machine head of the boring machine.

Compared with the prior art, the utility model effectively improves the production efficiency, replaces a plurality of cutters with one cutter, omits the processing procedure, greatly shortens the processing time and can bring considerable economic benefit for mass production.

Drawings

FIG. 1 is a schematic view of the structure of a workpiece to be machined according to the present utility model.

Fig. 2 is a schematic structural view of the present utility model.

FIG. 3 is a schematic view of the present utility model with plane one as the front view.

Fig. 4 is a schematic structural view of the present utility model with a second plane as a front plane.

Fig. 5 is a schematic structural view of the present utility model with the lower end face of the cutter body as a front face.

Fig. 6-9 are schematic views of the structure of the utility model in different conditions when working a workpiece.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

2-5, A boring cutter suitable for stepped holes comprises a cutter handle 1 and a cutter body 2 fixed with the cutter handle 1, and is characterized in that the cutter body 2 is provided with a first plane 21 and a second plane 22, an extension surface passes through the axis of the cutter handle 1, a third plane 23 and a fourth plane 24 which are respectively orthogonal to the first plane 21 and the second plane 22, and an included angle a between the first plane 21 and the second plane 22 is 60 degrees; the outer ends of the first plane 21 and the third plane 23 are connected through a first local sphere 25, the outer ends of the second plane 22 and the fourth plane 24 are connected through a second local sphere 26, the centers of the first local sphere 25 and the second local sphere 26 fall on the axis of the tool handle 1, and the distances from the other parts of the tool body 2 outside the first local sphere 25 and the second local sphere 26 to the axis of the tool handle 1 are smaller than the radius of the first local sphere 25 or the second local sphere 26; the middle parts of the first partial sphere 25 and the second partial sphere 26 are provided with a clearance groove 27 along the circumferential direction, a first blade 3 and a second blade 4 are respectively and fixedly arranged on the first plane 21 and at the upper edge and the lower edge of the corresponding clearance groove 27, a third blade 5 is fixedly arranged on the second plane 22 and at the lower edge of the corresponding clearance groove 27, and the distance between the edges of the first blade 3 and the second blade 4 is larger than the thickness H of the workpiece 100; the maximum radial width K of the profile of the cutter body 2 is smaller than the blank aperture D1 of the workpiece 100.

The cutter body 2 is also provided with a plane five 28 and an arc surface 29, the plane five 28 is parallel to the plane one 21 and is respectively arranged on two sides of the axial lead of the cutter handle 1, the arc surface 29 is connected with the plane five 28 and the plane four 24, and the circle center of the arc surface 29 is positioned on the opposite side of the axial lead of the cutter handle 1. The cross-sectional profile of the clearance groove 27 includes a transverse line 271 located above, a diagonal line 273 located below, and a vertical line 272 connecting the transverse line 271 and the diagonal line 273, the diagonal line 273 and the vertical line 272 having an angle of 135 °, and the edge portion of the third blade 5 being parallel to the diagonal line 273. The hardness of the cutter body 2 after heat treatment is HRC42+/-1.

The model of the blade I3, the blade II 4 and the blade III 5 is CCMT120408, and the middle part is provided with a fixing hole; blade mounting grooves are formed in the first plane 21 and the second plane 22 and correspond to the first blade 3, the second blade 4 or the third blade 5, and chip grooves and screw holes are formed in the blade mounting grooves; the fixing screw passes through the fixing hole and then is in threaded connection with the screw hole on the blade mounting groove. The knife handle 1 is axially provided with a side fixing plane 11 for being fastened with a rotating machine head of a boring machine. The screw model is M5.

Before machining, as shown in fig. 6, the boring cutter is positioned above the workpiece 100, and during machining, as shown in fig. 7, the boring cutter descends, and the cutter body 2 penetrates into a blank hole of the workpiece 100 in a clearance manner; then the boring cutter is shifted rightwards, as shown in fig. 8, the second 4-blade part of the blade is abutted against the lower section of the blank hole, the boring cutter is rotated to process a large round surface 102 of the large hole, and simultaneously, a chamfer is processed at the joint of the third 5 pairs of large round surfaces 102 of the blade and the inner end surface 103; then the boring cutter is displaced downwards, as shown in fig. 9, a 3-edge part of the blade is abutted against the upper section of the blank hole, and the boring cutter is rotated to process a small round surface 101 of the large hole; finally, the boring cutter is displaced leftwards and upwards to leave the workpiece 100, and one cutter and one working procedure complete the whole processing technology.

While the preferred embodiments of the present utility model have been described above by way of illustration, the scope of the utility model is not limited to the above description but is defined by all technical features set forth in the appended claims and their equivalents. It will be appreciated by those skilled in the art that any modifications and variations are possible within the scope of the claims of the present utility model without departing from the spirit and scope of the teachings of the utility model.

Claims (6)

1. The boring cutter suitable for the stepped hole comprises a cutter handle (1) and a cutter body (2) which is fixedly integrated with the cutter handle (1), and is characterized in that the cutter body (2) is provided with a first plane (21) and a second plane (22) which extend along the axis of the cutter handle (1), a third plane (23) and a fourth plane (24) which are respectively orthogonal with the first plane (21) and the second plane (22), the outer ends of the first plane (21) and the third plane (23) are connected through a first local spherical surface (25), the outer ends of the second plane (22) and the fourth plane (24) are connected through a second local spherical surface (26), the spherical centers of the first local spherical surface (25) and the second local spherical surface (26) fall on the axis of the cutter handle (1), and the distance between other parts of the cutter body (2) outside the first local spherical surface (25) and the second local spherical surface (26) is smaller than the radius of the axis of the cutter handle (1); the middle parts of the first partial sphere (25) and the second partial sphere (26) are provided with clearance grooves (27) along the circumferential direction, the first blade (3) and the second blade (4) are respectively and fixedly arranged on the first plane (21) and at the upper edge and the lower edge of the corresponding clearance groove (27), the third blade (5) is fixedly arranged on the second plane (22) and at the lower edge of the corresponding clearance groove (27), and the distance between the edges of the first blade (3) and the second blade (4) is larger than the thickness (H) of the workpiece (100); the maximum radial width (K) of the profile of the tool body (2) is smaller than the blank aperture (D1) of the workpiece (100).

2. The boring tool for stepped holes according to claim 1, wherein the tool body (2) is provided with a plane five (28) and an arc surface (29), the plane five (28) is parallel to the plane one (21) and is divided into two sides of the axial lead of the tool shank (1), the arc surface (29) is connected with the plane five (28) and the plane four (24), and the circle center of the arc surface (29) is located on the opposite side of the axial lead of the tool shank (1).

3. A boring tool for stepped bores according to claim 1, characterized in that the angle (a) between plane one (21) and plane two (22) is 60 °.

4. A boring tool for stepped holes according to claim 1, characterized in that the cross-sectional profile of the clearance groove (27) comprises a transverse line (271) located above, a diagonal line (273) located below, a vertical line (272) connecting the transverse line (271) and the diagonal line (273), the angle between the diagonal line (273) and the vertical line (272) being 135 °, the edge of the blade three (5) being parallel to the diagonal line (273).

5. The boring cutter for stepped holes according to claim 1, wherein the type of the first blade (3), the second blade (4) and the third blade (5) is CCMT120408, and a fixing hole is formed in the middle; a blade mounting groove is formed in the first plane (21) and the second plane (22) and corresponds to the first blade (3), the second blade (4) or the third blade (5), and a chip removing groove and a screw hole are formed in the blade mounting groove; the fixing screw passes through the fixing hole and then is in threaded connection with the screw hole on the blade mounting groove.

6. Boring tool for stepped holes according to claim 1, characterized in that the shank (1) is provided with a lateral fixing plane (11) axially for fastening with the rotating head of the machine boring machine.