CN115673360A - Cam-type adjustable boring cutter - Google Patents

Abstract

The invention discloses a cam type adjustable boring cutter, which relates to the technical field and comprises: the boring cutter body is provided with an accommodating groove; the body sliding block is detachably arranged in the accommodating groove and comprises a blade mounting part provided with a blade and a shaft mounting groove connected with the blade mounting part; and one end of the eccentric shaft penetrates through the shaft mounting groove and is arranged on the boring cutter body, and when the eccentric shaft rotates in the shaft mounting groove, the eccentric shaft can drive the body sliding block to perform cam motion so as to adjust the boring range of the blade. The cam type adjustable boring cutter can realize high-precision small deep hole machining.

Description

Cam-type adjustable boring cutter

Technical Field

The invention relates to the technical field, in particular to a cam type adjustable boring cutter.

Background

At present, in the production process of workpieces, a reaming process is generally adopted for high-precision small deep hole machining. The reaming can only ensure the precision of the hole, but the capability of correcting position errors and the original hole axis deflection is poor, the reamer belongs to a sizing cutter and has poor adaptability, one reamer can only machine holes with one size, and the reamer machining mode adopts low-speed and slow cutting, so the machining efficiency is low.

In order to solve the above problems, boring machining is generally selected, which corrects the axis deviation of the original hole by fine-tuning cutting a plurality of times. The boring cutter is one of boring cutters, and is used for rough machining, semi-finish machining or finish machining of an existing hole, most commonly inner hole machining, and is used for removing metal allowance of a workpiece during hole expansion.

The boring cutter can be divided into a rough boring cutter and a fine boring cutter, and the fine boring cutter is generally a single-blade boring cutter. Aiming at different bore diameters, an integral fine-adjustable fine boring cutter is usually adopted for a large bore diameter, an eccentric fine-adjustable fine boring cutter is usually adopted for a small bore diameter, when the eccentric boring cutter is used for machining the small bore diameter, the diameter of a cutter bar extending into a hole to be machined must be smaller due to the small bore diameter of the small bore, and the effective length of the cutter bar extending into the hole to be machined is generally 3 times of the diameter of the cutter bar during boring, so that the effective machining depth of the eccentric boring cutter is greatly limited. And the integral type fine tuning fine boring cutter head structure is complicated, can't realize the small aperture processing demand.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a cam type adjustable boring cutter capable of realizing high-precision small deep hole machining.

In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:

a cam-type adjustable boring tool comprising:

the boring cutter body is provided with an accommodating groove;

the body sliding block is detachably arranged in the accommodating groove and comprises a blade mounting part provided with a blade and a shaft mounting groove connected with the blade mounting part; and

and one end of the eccentric shaft penetrates through the shaft mounting groove and is arranged on the boring cutter body, and when the eccentric shaft rotates in the shaft mounting groove, the eccentric shaft can drive the body sliding block to perform cam motion so as to adjust the boring range of the blade.

In some embodiments, the eccentric shaft comprises:

the eccentric shaft section is accommodated in the shaft mounting groove;

the lower positioning shaft section is positioned at one end of the eccentric shaft section and arranged on the boring cutter body, and the axis of the lower positioning shaft section is parallel to the axis of the eccentric shaft section at intervals;

and the upper positioning shaft section is positioned at the other end of the eccentric shaft section, and the axis of the upper positioning shaft section is collinear with the axis of the lower positioning shaft section.

In some embodiments, the shaft mounting groove is a rectangular groove, a width of the rectangular groove is the same as a diameter of the eccentric shaft section, and a width direction of the rectangular groove is a moving direction of the body slider for performing the cam motion.

In some embodiments, the upper positioning shaft section is provided with an adjusting piece for driving the eccentric shaft to rotate.

In some embodiments, an outer hexagon is disposed on the upper positioning shaft section, and an inner hexagon hole matched with the outer hexagon is disposed on the adjusting piece.

In some embodiments, the adjusting member further includes a pointer with a taper angle, and a body end cap is further fixed on the boring tool body, and the body end cap includes:

an avoidance groove for providing a moving space of the body slider;

a first positioning hole for fixing the upper positioning shaft section;

and the scale marks are used for cooperating with the pointer to indicate the rotation angle of the eccentric shaft.

In some embodiments, the blade mounting portion includes a main body portion, the main body portion having a first positioning plane and a locking plane opposite to the first positioning plane;

two second positioning planes which are oppositely arranged at intervals are arranged on the boring cutter body, one second positioning plane is matched with the first positioning plane to limit the moving range of the blade, and the other second positioning plane is matched with the locking plane to fix the body sliding block.

In some embodiments, the boring cutter body is further provided with a first locking hole matched with the locking plane.

In some embodiments, the boring tool further comprises a boring tool bar, a diamond arc groove is formed in the boring tool bar, and a diamond arc shaft matched with the diamond arc groove is further arranged at the lower end of the boring tool body.

In some embodiments, the boring bar is further provided with a notch plane.

Compared with the prior art, the invention has the advantages that:

the cam type adjustable boring cutter comprises: the boring cutter comprises a boring cutter body, a boring cutter body and a boring cutter body, wherein an accommodating groove is formed in the boring cutter body; the body sliding block is detachably arranged in the accommodating groove and comprises a blade mounting part provided with a blade and a shaft mounting groove connected with the blade mounting part; and one end of the eccentric shaft penetrates through the shaft mounting groove and is arranged on the boring cutter body 1, and when the eccentric shaft rotates in the shaft mounting groove, the eccentric shaft can drive the body sliding block to perform cam motion along with the eccentric shaft so as to adjust the boring range of the blade. Compared with an eccentric type fine-tunable boring cutter, the cam type adjustable boring cutter can be used for boring small-aperture deep hole machining (the hole depth is larger than 3 times of the aperture), and compared with a conventional integrated fine-tunable boring cutter, the cam type adjustable boring cutter adjusts the machining range in a cam motion mode, so that the whole size is smaller, and the machining range is widened. One end of the boring cutter bar of the cam type adjustable boring cutter can be arranged on a numerical control machine tool spindle cutter handle, and after an inner hole of a workpiece is roughly bored, fine adjustment can be performed in a scale pointer mode according to the size after boring so as to realize high-precision small deep hole machining.

Drawings

FIG. 1 is an exploded view of a cam-type adjustable boring tool in an embodiment of the present invention;

FIG. 2 is a front view and an A-direction view of a boring tool body in an embodiment of the invention;

FIG. 3 is a perspective view of a boring tool body in an embodiment of the present invention;

FIG. 4 is a top view of a boring tool body in an embodiment of the present invention;

FIG. 5 is a perspective view of one orientation of the body slide in an embodiment of the present invention;

FIG. 6 is a perspective view of another orientation of the body slide of an embodiment of the present invention;

FIG. 7 is a schematic view showing the construction of an eccentric shaft in the embodiment of the present invention;

FIG. 8 is a schematic structural view of a body end cap in an embodiment of the present invention;

FIG. 9 is a schematic structural view of a boring bar in an embodiment of the present invention;

FIG. 10 is a schematic view of the structure of an adjusting member in an embodiment of the present invention;

FIG. 11 is a schematic view of the use of a cam-type adjustable boring tool in an embodiment of the present invention.

In the figure: 1. a boring cutter body; 11. an accommodating groove; 12. a second positioning plane; 13. a first locking hole; 131. a countersunk hole; 14. a diamond-shaped arc shaft; 141. a circular pit; 142. transition fillets; 15. a second positioning hole; 16. a countersunk threaded hole; 17. a neutral plane; 2. a body slide block; 21. a blade; 211. a blade fixing screw; 22. a blade mounting portion; 221. a first location plane; 222. a locking plane; 223. a blade mounting groove; 224. locking the threaded hole; 23. shaft mounting grooves; 231. an inner rectangular aperture; 3. an eccentric shaft; 31. an eccentric shaft section; 32. a lower positioning shaft section; 33. an upper positioning shaft section; 331. an outer hexagon; 34. a threaded segment; 4. a body end cap; 41. an avoidance groove; 42. a first positioning hole; 43. scale lines; 44. countersunk screw holes; 5. boring a cutter bar; 51. a rhombic arc groove; 52. a notch plane; 53. a second locking hole; 54. a transitional arc angle; 6. an adjustment member; 61. an inner hexagonal hole; 62. a pointer; 7. m2.5 nuts; 8. m4 inner hexagonal flat head screws; 9. a countersunk head screw; 100. an inner hexagonal wrench; 200. an outer hexagonal fork wrench.

Detailed Description

The invention will now be described in further detail, including the preferred embodiments, with reference to the accompanying drawings and by way of illustration of some alternative embodiments of the invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Further, in the present application, relational terms such as "first" and "second", and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

Referring to fig. 1, the embodiment of the invention discloses a cam-type adjustable boring cutter, which comprises a boring cutter body 1, a body sliding block 2 and an eccentric shaft 3.

Referring to fig. 2 to 7, a receiving groove 11 is formed on the boring cutter body 1; the body sliding block 2 is detachably arranged in the accommodating groove 11, and the body sliding block 2 comprises a blade mounting part 22 provided with a blade 21 and a shaft mounting groove 23 connected with the blade mounting part 22; one end of the eccentric shaft 3 penetrates through the shaft mounting groove 23 and is arranged on the boring cutter body 1, and when the eccentric shaft 3 rotates in the shaft mounting groove 23, the body slide block 2 can be driven to perform cam motion to adjust the boring range of the blade 21.

It should be noted that the tool bit structure of the integral fine-tunable fine boring tool in the prior art is mainly realized by screwing in and out a threaded structure, so that the tool bit structure is complex, and the requirement of small-aperture (the diameter is less than 18 mm) machining cannot be realized. In the cam-type adjustable boring tool of the present embodiment, the eccentric shaft 3 drives the body slide 2 to perform a cam motion, so as to adjust the boring range of the blade 21. Compared with a thread adjusting mode, the thread adjusting device is simple in structure, so that the whole size is small, and the requirement for processing small holes can be met.

Specifically, referring to fig. 7, the eccentric shaft 3 includes an eccentric shaft section 31, a lower positioning shaft section 32, and an upper positioning shaft section 33.

The eccentric shaft section 31 is accommodated in the shaft mounting groove 23; the lower positioning shaft section 32 is positioned at one end of the eccentric shaft section 31 and is arranged on the boring cutter body 1, and the axis of the lower positioning shaft section 32 is parallel to the axis of the eccentric shaft section 31 at intervals; the upper positioning shaft section 33 is located at the other end of the eccentric shaft section 31, and the axis of the upper positioning shaft section 33 is collinear with the axis of the lower positioning shaft section 32.

In addition, the shaft mounting groove 23 is a rectangular groove, the width of the rectangular groove is the same as the diameter of the eccentric shaft section 31, and the width direction of the rectangular groove is the moving direction of the body slider 2 for cam movement.

It will be appreciated that since the axis of the upper locating shaft section 33 is collinear with the axis of the lower locating shaft section 32, the upper locating shaft section 33 and the lower locating shaft section 32 will rotate along the same axis when the eccentric shaft 3 is rotated. Because the axes of the eccentric shaft section 31 and the lower positioning shaft section 32 are arranged in parallel at intervals, the rotating axes are different from the upper positioning shaft section 33 and the lower positioning shaft section 32, the eccentric shaft section 31 is bound by a rectangular groove, and because the width size of the rectangular groove is the same as the diameter size of the eccentric shaft section 31, the length size of the rectangular groove is larger than the diameter size of the eccentric shaft section 31, so that when the eccentric shaft section 31 rotates, the body sliding block 2 can be driven to carry out cam motion.

Referring to fig. 10, in some preferred embodiments, for the convenience of adjustment, the upper positioning shaft section 33 is provided with an adjusting piece 6 for driving the eccentric shaft 3 to rotate. Preferably, the upper positioning shaft section 33 is provided with an outer hexagon 331, and the adjusting member 6 is provided with an inner hexagon 61 matched with the outer hexagon 331. It is understood that the matching mode can be other combination modes such as an outer eight-direction hole, an inner eight-direction hole and the like.

Further, the adjusting member 6 further includes a pointer 62 with a taper angle, as shown in fig. 8, the boring cutter body 1 is further fixed with a body end cover 4, and the body end cover 4 includes an avoiding groove 41, a first positioning hole 42 and scale marks 43. The escape groove 41 is used to provide a moving space of the body slider 2; the first positioning hole 42 is used for fixing the upper positioning shaft section 33; the scale marks 43 are used to indicate the rotation angle of the eccentric shaft 3 in cooperation with the pointer 62. Thus, when the adjusting member 6 is rotated, the rotation angle of the eccentric shaft 3 can be displayed by the pointer 62 and the scale line 43, and then the adjustment degree of the blade 21 can be known according to the mapping relationship between the rotation angle of the eccentric shaft 3 and the displacement of the blade 21.

In some embodiments, referring to fig. 5 and 6, the insert mounting portion 22 includes a body portion having a first locating plane 221 and a locking plane 222 disposed opposite the first locating plane 221.

Two second positioning planes 12 which are oppositely arranged at intervals are arranged on the boring cutter body 1, one second positioning plane 12 is matched with the first positioning plane 221 to limit the moving range of the blade 21, and the other second positioning plane 12 is matched with the locking plane 222 to fix the body sliding block 2. Preferably, the boring cutter body 1 is further provided with a first locking hole 13 matched with the locking plane 222. The second positioning plane 12 and the locking plane 222 are locked by bolts passing through the first locking holes 13.

The insert 21 is disposed above the first seating plane 221 and the locking plane 222 and is fixed to the body portion by the insert fixing screw 211.

In some embodiments, the cam-type adjustable boring tool shown in fig. 9 further includes a boring tool bar 5, a diamond-shaped arc groove 51 is formed on the boring tool bar 5, and a diamond-shaped arc shaft 14 matched with the diamond-shaped arc groove 51 is further arranged at the lower end of the boring tool body 1. The boring cutter rod 5 and the boring cutter body 1 can be fixed together by matching the diamond-shaped arc shaft 14 with the diamond-shaped arc groove 51.

Preferably, the boring bar 5 is further provided with a notch plane 52, and one end of the boring bar 5, which is provided with the notch plane 52, is used for being mounted on the upper side fixed type tool shank of the spindle of the numerical control machine tool.

The structure and the assembly relationship of the cam type adjustable boring cutter in the embodiment of the invention are further explained by combining the drawings as follows:

the cam type adjustable boring cutter in the embodiment of the invention mainly comprises: the boring cutter comprises a boring cutter body 1, a body sliding block 2, an eccentric shaft 3, a body end cover 4, a boring cutter rod 5, an adjusting piece 6 and an M2.5 nut 7.

The M2.5 nut 7 is a standard component, the adjusting component 6 is a hexagonal structure, the center of the adjusting component is provided with an inner hexagonal hole 61, one end of the adjusting component is provided with a pointer 62 with a cone angle of 60 degrees, the adjusting component is arranged on the upper end face of the body end cover 4 and sleeved on the outer hexagonal hole 331 of the eccentric shaft 3.

The body end cover 4 is of a disc-shaped structure, and one end of the body end cover is provided with a U-shaped avoidance groove 41 which is used for avoiding the body sliding block 2 so as to adjust the sliding range; two countersunk screw holes 44 are arranged at the central symmetry part and are used for fixing parts in the boring cutter body 1; a first positioning hole 42 is formed at the right end of the center and used for fixing the upper positioning shaft section 33; the right end of the first positioning hole 42 is provided with a scale mark 43 with positive and negative 90 degrees symmetry, and the scale mark is used for comparing numerical values when the tool bit is finely adjusted.

The eccentric shaft 3 is of a stepped shaft structure, and the top end of the eccentric shaft is provided with a threaded section 34 for locking the M2.5 nut 7; the lower end of the thread section 34 is provided with an external hexagon 331 for passing through an internal hexagon hole 61 of the adjusting piece 6; the lower end of the outer hexagon is provided with an upper positioning shaft section 33 which is used for passing through a first positioning hole 42 on the body end cover 4 for positioning; the lower end of the upper positioning shaft section 33 is provided with an eccentric shaft section 31, and the eccentric direction of the eccentric shaft section 31 keeps the same direction with the opposite side position of the outer hexagon 331; the bottom end of the eccentric shaft section 31 is provided with a lower positioning shaft section 32 which is used for being inserted into a second positioning hole 15 in the boring cutter body 1; wherein the thread section 34, the external hexagonal surface 331, the upper positioning shaft section 33 and the lower positioning shaft section 32 are on the same axis and keep a distance of 0.5mm with the axis of the eccentric shaft section 31.

The body slide block 2 is of a T-shaped structure, the right end of the body slide block is provided with a shaft mounting groove 23, and the shaft mounting groove 23 is a rectangular groove; an inner rectangular hole 231 is formed in the center of the rectangular groove and used for being inserted into the eccentric shaft section 31 in a penetrating mode, and the width size of the inner rectangular hole 231 is the same as the diameter size of the eccentric shaft section 31; the blade mounting part 22 at the left end of the rectangular groove is provided with a locking plane 222 for screw compression; the back of the locking plane 222 is provided with a first positioning plane 221 for limiting the movement of the boring cutter head; the upper end of the first positioning plane 221 is provided with a blade mounting groove 223 and a locking threaded hole 224 for positioning and locking the blade 21.

The boring cutter body 1 is of a stepped shaft structure, and a T-shaped accommodating groove 11 is formed in the upper end of the boring cutter body and used for installing the body sliding block 2; a second positioning plane 12 is arranged at one end of the containing groove 11 and is used for installing and matching the first positioning plane 221 on the body slide block 2; the center of the rectangular outline of the containing groove 11 is provided with a second positioning hole 15 for mounting a lower end positioning shaft section 32; two countersunk threaded holes 16 are formed in the centrosymmetric position of the upper end surface of the boring cutter body 1, and the end cover 4 of the body can be locked and fixed by combining countersunk screws 9; the left end of the containing groove 11 is provided with a neutral plane 17 for chip removal during boring; a first locking hole 13 is formed in the center of the second positioning plane 12 in the vertical direction and used for locking and fixing the body sliding block 2; the end face of the first locking hole 13 is provided with a countersunk hole 131 for positioning and screwing a screw; the lower end of the boring cutter body 1 is provided with a diamond-shaped arc shaft 14 for butt joint installation of a boring cutter rod 5; a circular pit 141 is arranged on a central bus of the rhombic arc shaft 14 and used for locking and fixing the boring cutter body 1; the root of the rhombic arc shaft 14 is provided with a transition fillet 142 for enhancing the connection rigidity of the upper end and the lower end of the boring cutter body 1.

The boring cutter bar 5 is of a cylindrical structure, and a diamond arc groove 51 is formed in the upper end face of the boring cutter bar and used for mounting the boring cutter body 1; a second locking hole 53 is formed in the center of the rhombic arc groove 51 and used for locking and fixing the boring cutter body 1; the end face of the rhombic arc groove is provided with a transitional arc angle 54 for the installation, guiding and matching of the boring cutter body; the lower end of the boring cutter rod is provided with a gap plane 52 for fixing and locking the upper side fixed cutter handle of the numerical control machine spindle.

The following describes a method for using the cam-type adjustable boring tool in the embodiment of the invention:

referring to fig. 11, the cam-type adjustable boring tool of the present invention is applied to boring a fine boring tool of a numerical control machine tool, and is characterized in that first, one end of a boring tool bar 5 having a notch plane 52 is mounted on an upper fixed tool holder of a spindle of the numerical control machine tool, and a hexagon socket wrench 100 is used to tighten a screw to the notch plane 52, and the protruding length of the cam-type adjustable boring tool must be greater than the effective depth of a boring hole. Moving the fine boring cutter to a boring designated coordinate value through a numerical control machine, loosening the M4 inner hexagonal flat head screw 8 by using the inner hexagonal wrench 100, loosening the M2.5 nut 7 by using the outer hexagonal fork wrench 200, rotating the adjusting piece 6 to a 0-degree minimum boring range, then locking the M2.5 nut 7 and the M4 inner hexagonal flat head screw 8, carrying out rough boring on the machined hole, measuring the actual size of the hole after the rough boring, and then finely boring the fine boring cutter according to the size tolerance value required by a drawing. And loosening the M4 hexagon socket head cap screw 8, loosening the M2.5 nut 7 to rotate the adjusting piece 6 to a corresponding scale tolerance range, locking the M2.5 nut 7 and the M4 hexagon socket head cap screw 8, finally performing fine boring processing, and finally realizing the fine-tuning fine boring function of the high-precision small deep hole.

In summary, the cam-type adjustable boring tool of the present invention includes: the boring cutter comprises a boring cutter body 1, a boring cutter body and a boring cutter head, wherein an accommodating groove 11 is formed in the boring cutter body; the body slider 2 is detachably arranged in the accommodating groove 11, and the body slider 2 comprises a blade mounting part 22 provided with a blade 21 and a shaft mounting groove 23 connected with the blade mounting part 22; one end of the eccentric shaft 3 penetrates through the shaft mounting groove 23 and is arranged on the boring cutter body 1, and when the eccentric shaft 3 rotates in the shaft mounting groove 23, the body sliding block 2 can be driven to perform cam motion along with the eccentric shaft 3 so as to adjust the boring range of the blade 21. Compared with an eccentric type fine-tunable boring cutter, the cam type adjustable boring cutter can be used for boring small-aperture deep hole machining (the hole depth is larger than 3 times of the aperture), and compared with a conventional integrated fine-tunable boring cutter, the cam type adjustable boring cutter adjusts the machining range in a cam motion mode, so that the whole size is smaller, and the machining range is widened. One end of the boring cutter bar of the cam type adjustable boring cutter can be arranged on a numerical control machine tool spindle cutter handle, and after an inner hole of a workpiece is roughly bored, fine adjustment can be performed in a scale pointer mode according to the size after boring so as to realize high-precision small deep hole machining.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A cam-type adjustable boring tool, comprising:

the boring cutter comprises a boring cutter body (1) which is provided with an accommodating groove (11);

the body sliding block (2) is detachably arranged in the accommodating groove (11), and the body sliding block (2) comprises a blade mounting part (22) provided with a blade (21) and a shaft mounting groove (23) connected with the blade mounting part (21); and

and one end of the eccentric shaft (3) penetrates through the shaft mounting groove (23) and is arranged on the boring cutter body (1), and when the eccentric shaft (3) rotates in the shaft mounting groove (23), the body sliding block (2) can be driven to carry out cam motion so as to adjust the boring range of the blade (21).

2. Cam-type adjustable boring tool according to claim 1, characterized in that the eccentric shaft (3) comprises:

an eccentric shaft section (31) which is accommodated in the shaft mounting groove (23);

the lower positioning shaft section (32) is positioned at one end of the eccentric shaft section (31) and is arranged on the boring cutter body (1), and the axis of the lower positioning shaft section (32) is parallel to the axis of the eccentric shaft section (31) at an interval;

an upper positioning shaft section (33) located at the other end of the eccentric shaft section (31), and the axis of the upper positioning shaft section (33) is collinear with the axis of the lower positioning shaft section (32).

3. The cam-type adjustable boring cutter as claimed in claim 2, wherein the shaft-type mounting groove (23) is a rectangular groove having a width dimension the same as a diameter dimension of the eccentric shaft section (31), and a width direction of the rectangular groove is a moving direction of the body slider (2) for the cam motion.

4. The cam-type adjustable boring tool as set forth in claim 2, wherein: and the upper positioning shaft section (33) is provided with an adjusting piece (6) for driving the eccentric shaft (3) to rotate.

5. The cam-type adjustable boring tool as claimed in claim 4, wherein:

the upper positioning shaft section (33) is provided with an outer hexagon (331), and the adjusting piece (6) is provided with an inner hexagon hole (61) matched with the outer hexagon (331).

6. The cam-type adjustable boring tool as claimed in claim 4 or 5, wherein the adjusting piece (6) further comprises a pointer (62) with a taper angle, the boring tool body (1) is further fixed with a body end cover (4), and the body end cover (4) comprises:

an escape groove (41) for providing a moving space of the body slider (2);

a first positioning hole (42) for fixing the upper positioning shaft section (33);

a scale mark (43) for indicating the rotation angle of the eccentric shaft (3) in cooperation with the pointer (62).

7. The cam-type adjustable boring tool as set forth in claim 1, wherein:

the blade mounting part (22) comprises a main body part, wherein a first positioning plane (221) and a locking plane (222) opposite to the first positioning plane (221) are arranged on the main body part;

two second positioning planes (12) which are arranged oppositely at intervals are arranged on the boring cutter body (1), one second positioning plane (12) is matched with the first positioning plane (221) to limit the moving range of the blade (21), and the other second positioning plane (12) is matched with the locking plane (222) to fix the body sliding block (2).

8. The cam-type adjustable boring tool as claimed in claim 7, wherein: the boring cutter body (1) is further provided with a first locking hole (13) matched with the locking plane (222).

9. The cam-type adjustable boring tool as set forth in claim 1, wherein: the boring tool is characterized by further comprising a boring tool bar (5), wherein a diamond-shaped arc groove (51) is formed in the boring tool bar (5), and a diamond-shaped arc shaft (14) matched with the diamond-shaped arc groove (51) is further arranged at the lower end of the boring tool body (1).

10. The cam-type adjustable boring tool as set forth in claim 9, wherein: and a notch plane (52) is also arranged on the boring cutter rod (5).

Images