CN108555325B - Boring cutter for reverse boring - Google Patents

Abstract

The invention relates to a boring tool, and discloses a boring tool for reverse boring. One end of the tool bar is provided with a connecting rod passing through the through groove, a guide block is provided on the inner wall of the through groove, and a guide surface 1 and a guide surface 2 are respectively fitted on the connecting rod, which are respectively fitted with the guide block. Both ends of the rod are flush, and the end of the connecting rod away from the cutter rod is provided with a limit block protruding from the plane where the guide surface two is located. Angle, between the guide surface 2 and the limit block, there is a guide surface 3 that restricts the rotation of the tool bar relative to the tool seat. When the guide surface 3 is in contact with the guide block, the limit block is in contact with the guide block; the tool bar and the tool seat are provided. Quick disassembly and assembly, which is convenient for back-boring the workpiece, thereby improving work efficiency.

Description

A boring tool for reverse boring

technical field

The invention relates to a boring tool, in particular to a boring tool for reverse boring.

Background technique

The boring tool is a kind of hole machining tool, generally with a round shank, and there are also larger workpieces that use a square shank generally seen in vertical lathes. The most commonly used occasions are inner hole machining, reaming, profiling, etc.

Anti-boring tool (reverse scraper) is a common tool for processing the inner side of through holes of mechanical product parts. At present, the existing anti-boring tool is mainly composed of a shank, a common anti-boring blade, and a compression screw. The cross-sectional structure of the blade is usually circular, and the part of the reverse-boring blade is an integral high-speed steel tool. The tool is fixed on the blade by a compression screw on the rod. In the actual machining process of such a counter-boring tool, the counter-boring blade will vibrate greatly with the rotation of the tool holder, which will reduce the quality of the inner side of the processed workpiece through hole, and the replacement of the blade of this type of counter-boring cutter is troublesome. , to increase production assistance time.

The Chinese patent with the authorization announcement number of CN201267880Y and the application date of July 1, 2008 discloses a counterboring cutter, which includes a cutter bar and a counterboring blade, and a connecting rod is provided at the end of the cutter rod, and the end of the connecting rod is provided with a connecting rod. There is a support part perpendicularly intersecting with the support part, the cutter bar and the connecting rod are integrally connected with the support part, the back-boring blade is installed on the support part, and the cross section of the connecting rod is oblate. The cross-section of the connecting rod is in the shape of a blade, and the cross-sectional shape of the blade is a shape formed by connecting two arcs protruding outward, and the plane formed by the connection line between the blade root and the blade tip is perpendicular to the counter-boring blade; so It is set so that during use, the vibration of the blade along with the rotation of the cutter bar is small, so that the inner side of the through hole of the workpiece after being processed and formed has a better surface quality.

The disadvantage of the prior art is that when this kind of boring tool needs to process the workpiece, the tool bar needs to be disassembled from the driving device, and the tool bar needs to pass through the workpiece from the back side of the workpiece relative to the side of the counter-boring blade. The back-boring blade can be used to bore the workpiece; or the workpiece itself needs to have a larger through hole, so that the back-boring blade can directly pass through the through hole on the front side, and then make the driving device Drive the counter-boring tool to rotate eccentrically, and perform boring work on the workpiece; both of these two operations are more troublesome, which brings certain operational difficulties to the staff and affects their work efficiency.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a boring tool for reverse boring, which has the advantages of quick disassembly and assembly of the tool shank and the tool seat, which facilitates the reverse boring of the workpiece, thereby improving the working efficiency.

The above-mentioned technical purpose of the present invention is achieved through the following technical solutions:

A boring tool for reverse boring, comprising a tool holder and a tool holder, the tool holder is provided with an anti-boring blade, and one end of the tool holder used for connecting with a driving device is located on the side of the tool holder facing the back-boring blade , the center of the knife seat is provided with a through groove along its thickness direction, one end of the knife rod is provided with a connecting rod passing through the through groove, the inner wall of the through groove is provided with a guide block, and the connecting rod is provided with A guide surface 1 and a guide surface 2 that the guide block is attached to, the two ends of the first guide surface are flush with the two ends of the connecting rod, and the end of the connecting rod away from the cutter rod is provided with a limit protruding from the plane where the guide surface two is located. The connection between the guide surface 1 and the guide surface 2 is inverted to form a rounded corner that makes the tool shank rotate relative to the tool seat, and a guide to limit the rotation of the tool shank relative to the tool seat is provided between the guide surface 2 and the limit block. Face three, when the guide face three is in contact with the guide block, the limit block abuts the guide block to limit the axial displacement of the tool seat and the tool shank.

With the above structure, when working, the tool seat is placed under the workpiece, the tool bar passes through the central through hole of the workpiece, and the guide surface of the connecting bar is aligned with the guide block and inserted into the through groove of the tool seat, and then passes through the guide surface. The rounded corner between the first and the second guide surface makes the tool bar rotatable, and the second guide surface is attached to the guide block, and then the tool bar is pulled to make the third guide surface on the connecting rod fit with the guide block, limiting the tool bar and the guide block. The circumferential movement of the tool holder, at the same time, the limit block is in contact with the guide block, and during the machining process, the contact between the back-boring insert and the workpiece gives the tool holder downward movement, limiting the axial displacement of the tool holder relative to the tool holder, so that it can quickly move The disassembly and assembly of the tool holder and the tool holder is realized, which is convenient for the back-boring work of the workpiece, and can effectively improve the work efficiency.

It is further preferred that the length of the second guide surface is not less than the distance from the side of the tool seat toward the side of the counter-boring blade to the side of the guide block away from the side of the counter-boring blade.

By adopting the above structure, it can satisfy the rotation work of the tool bar relative to the tool seat.

It is further preferred that a guide groove for placing a guide block is provided on the side of the tool seat away from the counter-boring blade, and the guide block is connected to the tool seat through a locking bolt.

With the above structure, since the guide block and the tool seat are integrally formed, it is more troublesome to process. The guide block can be disassembled from the tool seat through the guide groove opened on the tool seat. On the one hand, the processing difficulty of the tool seat is reduced, and on the other hand, when When the guide block is worn, it can be directly replaced with a new guide block, which is convenient for the staff to work.

Further preferably, one end of the guide block protrudes beyond the outer wall of the tool seat.

With the above structure, one end of the guide block protrudes beyond the outer wall of the tool seat, so that it is convenient for the staff to hold the guide block to insert or pull out the guide groove, so as to facilitate its disassembly and assembly.

It is further preferred that: the counter-boring inserts are provided with two groups, which are evenly distributed on the tool seat along the circumference of the tool shank.

By adopting the above structure, the two sets of counter-boring inserts are arranged to process the workpiece, and the boring efficiency is improved; and the two sets of inserts are distributed on the tool seat to make the tool seat more balanced. It is convenient for the tool bar to drive the tool seat to rotate.

It is further preferred that a placement groove for placing the counter-boring insert is provided on the tool holder, and the counter-boring insert is limited to the placement groove by a fastening bolt.

By adopting the above structure, the installation grooves provided on the tool holder facilitate the installation of the back-boring inserts, and the back-boring inserts are stably fixed on the tool holder by tightening bolts.

Further preferably, the fastening bolts are threadedly connected to the tool seat through the counter-boring inserts, and the fastening bolts are inclined downward on the side away from the counter-boring inserts.

By adopting the above structure, the side of the tightening bolt away from the anti-boring insert is inclined downward, so that when the tightening bolt is threadedly connected to the tool seat, the bolt head of the tightening bolt gives the horizontal and vertical pressing force to the anti-boring insert. , so that the three surfaces of the anti-boring insert are tightly attached to the inner wall of the placement groove, and the stable connection between the anti-boring insert and the tool seat is enhanced.

It is further preferred that the tool seat is located on the side of the back-boring blade in contact with the workpiece to be hollowed out to form a chip removal groove.

By adopting the above structure, the tool holder is located at the back-boring blade and hollowed out to form a chip removal groove, which on the one hand facilitates the discharge of iron filings when the workpiece is processed; The seat rotates.

In summary, the present invention has the following beneficial effects: the first guide surface on the connecting rod is inserted into the through groove of the tool seat along the guide block of the tool seat, and then the tool bar is rotated to make the second guide surface fit with the guide block. , and then pull the tool bar to make the guide surface three fit with the guide block, limit the circumferential movement of the tool bar relative to the tool seat, and then use the limit block to abut one end of the guide block and the back-boring blade to give the tool seat to the workpiece during processing. The downward movement force limits the axial displacement of the tool holder relative to the tool holder, and realizes the quick disassembly and assembly of the tool holder and the tool holder, which facilitates the reverse boring of the workpiece and can effectively improve its work efficiency.

Description of drawings

Fig. 1 is the overall structure schematic diagram of this embodiment;

Fig. 2 is the structural representation of the knife seat in Fig. 1;

FIG. 3 is a schematic structural diagram of the cutter bar in FIG. 1 .

In the figure, 1, the tool bar; 2, the tool seat; 3, the through groove; 4, the guide block; 5, the guide groove; 6, the guide surface one; 7, the guide surface two; 8, the guide surface three; 9, the connecting rod ; 10. Limit block; 11. Locking bolts; 12. Fastening bolts; 13. Anti-boring inserts; 14. Placing grooves.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings.

A boring tool for reverse boring, as shown in Figures 1 and 2, includes a tool holder 1 and a tool holder 2, the tool holder 2 is provided with a reverse boring insert 13, and one end of the tool holder 1 is connected to the center of the tool holder 2 at the other end. Connected with the drive device, when processing the workpiece, first place the knife under the workpiece, and the end of the tool bar 1 at the connecting rod 9 passes through the through hole in the middle of the workpiece and is connected to the tool seat 2 to realize the reverse boring of the workpiece.

2 and 3, the center of the above-mentioned knife holder 2 is provided with a through groove 3 along its thickness direction, and a connecting rod 9 is fixed on one end of the knife rod 1 away from the driving device. A guide block 4 is provided on the side of the groove 3 opposite to the counter-boring blade 13, and a guide surface 1 6 and a guide surface 2 7 are provided on the connecting rod 9, wherein the two ends of the guide surface 1 6 are flush with the two ends of the connecting rod 9, The connecting rod 9 is far away from the cutter bar 1 and is located at the guide surface 27 with a limit block 10. A vertical guide surface 38 is arranged between the limit block 10 and the guide surface 27, and the guide surface 16 and the guide surface 2 The corners between 7 and 7 are rounded upside down. During installation, the guide surface one 6 of the connecting rod 9 is inserted into the through groove 3 along the side wall of the guide block 4, and then the connecting rod 9 is rotated to make the guide surface two 7 and the guide block 4. The side wall is attached, and the connecting rod 9 is pulled to make the guide surface 38 fit with the side wall of the guide block 4, so that the connecting rod 9 cannot be rotated relative to the knife seat 2, and then the limit block 10 is in contact with the side of the guide block 4. The movement of the tool holder 2 relative to the axis of the tool holder 1 is restricted.

In this embodiment, the outer wall of the limiting block 10 is in contact with the inner wall of the through groove 3 .

In this embodiment, the length of the guide surface 2 7 is not less than the distance from the side of the tool holder 2 toward the side of the counter-boring blade 13 to the side of the guide block 4 away from the side of the counter-boring blade 13 .

In this embodiment, the guide surface 1 6 and the guide surface 2 7 are vertically arranged, so that the tool bar 1 can be rotated 90° in the forward and reverse directions relative to the tool seat 2 to achieve its position limiting or dismounting function.

A guide groove 5 communicated with the through groove 3 is provided on the side of the above-mentioned tool holder 2 away from the counter-boring blade 13. The guide block 4 is inserted into the guide groove 5, and passes through the guide block 4 and the tool holder 2 through two locking bolts 11. Threaded connection for stable installation.

In this embodiment, one end of the guide block 4 protrudes beyond the outer wall of the tool seat 2 , and the guide block 4 is provided with a countersunk hole corresponding to the locking bolt 11 , and the bolt head of the locking bolt 11 sinks into the guide block 4 .

The above-mentioned anti-boring inserts 13 are provided with two groups, and the two sets of anti-boring inserts 13 are arranged on the tool holder 2 along the circumference of the cutter bar 1, and the tool holder 2 is provided with a placement groove 14 corresponding to the back-boring insert 13, and the back-boring inserts 13 are passed through the tightening bolts 12. The boring insert 13 is threadedly connected with the tool holder 2 to fix the counter-boring insert 13 in the placement groove 14 .

In this embodiment, the back-boring inserts 13 are arranged in a triangular shape, and the placement grooves 14 are arranged in a triangular shape with an open upper end. The side of the tightening bolt 12 away from the anti-boring blade 13 is inclined downward, and the bolt head of the tightening bolt 12 and the through hole on the anti-boring blade 13 are arranged in a truncated cone shape. The boring blade 13 forms a pulling force, and closely fits the three side walls of the counter-boring blade 13 with the placement groove 14 , thereby enhancing the stable installation force of the counter-boring blade 13 .

The above-mentioned tool holder 2 is located on the side of the counterboring insert 13 in contact with the workpiece and is hollowed out to form a chip removal groove, so that the iron chips can be directly discharged from the chip removal groove during boring.

Working principle: When back boring the workpiece, first pass one end of the tool bar 1 through the workpiece through hole so that the guide surface 1 6 of the connecting rod 9 is flush with the side wall of the guide block 4 in the through slot 3 of the tool seat 2 and inserted. Connected to the through groove 3, so that the guide surface 38 exceeds the guide block 4, rotate the tool bar 1 or the tool seat 2, so that the guide surface 27 is in contact with the side wall of the guide block 4, and the tool seat 2 is displaced downward. When the limiting block 10 is in contact with the guide block 4, the guide surface 3 8 is in close contact with the side wall of the guide block 4 to limit the circumferential movement of the tool seat 2 relative to the tool bar 1, and then to the workpiece. Do back boring work.

This specific embodiment is only an explanation of the present invention, and it does not limit the present invention. Those skilled in the art can make modifications without creative contribution to the present embodiment as needed after reading this specification, but only within the protection of the present invention are protected by patent law.

Claims (8)

1. The boring cutter for reverse boring comprises a cutter bar (1) and a cutter holder (2), wherein a reverse boring blade (13) is arranged on the cutter holder (2), one end, used for being connected with a driving device, of the cutter bar (1) is located on one side, facing the reverse boring blade (13), of the cutter holder (2), and the boring cutter is characterized in that: the center of the cutter holder (2) is provided with a through groove (3) along the thickness direction, one end of the cutter bar (1) is provided with a connecting rod (9) which penetrates through the through groove (3), the inner wall of the through groove (3) is provided with a guide block (4), the connecting rod (9) is provided with a first guide surface (6) and a second guide surface (7) which are respectively attached to the guide block (4), the two ends of the first guide surface (6) are flush with the two ends of the connecting rod (9), one end of the connecting rod (9) far away from the cutter bar (1) is provided with a limiting block (10) which protrudes out of the plane of the second guide surface (7), the joint of the first guide surface (6) and the second guide surface (7) is inverted into a round angle which enables the cutter bar (1) to rotate relative to the cutter holder (2), and a third guide surface (8) which limits the cutter bar (1) to rotate relative to the cutter holder (2, when the third guide surface (8) is attached to the guide block (4), the limiting block (10) is abutted to the guide block (4) to limit the axial displacement of the cutter holder (2) and the cutter bar (1).

2. The reverse boring cutter as set forth in claim 1, wherein: the length of the second guide surface (7) is not less than the distance from one side, facing the reverse boring blade (13), of the tool apron (2) to one side, far away from the reverse boring blade (13), of the guide block (4).

3. The reverse boring cutter as set forth in claim 1, wherein: a guide groove (5) used for placing a guide block (4) is formed in one side, away from the reverse boring blade (13), of the tool apron (2), and the guide block (4) is connected with the tool apron (2) through a locking bolt (11).

4. A reverse boring cutter as claimed in claim 3 wherein: one end of the guide block (4) exceeds the outer wall of the cutter holder (2).

5. The reverse boring cutter as set forth in claim 1, wherein: the reverse boring blades (13) are arranged in two groups and are uniformly distributed on the tool apron (2) along the circumference of the tool bar (1).

6. The reverse boring cutter as set forth in claim 5, wherein: a placing groove (14) for placing a reverse boring blade (13) is formed in the tool apron (2), and the reverse boring blade (13) is limited in the placing groove (14) through a fastening bolt (12).

7. The reverse boring cutter as set forth in claim 6, wherein: the fastening bolt (12) penetrates through the reverse boring blade (13) to be in threaded connection with the cutter holder (2), and the fastening bolt (12) is arranged in a downward inclined mode on one side far away from the reverse boring blade (13).

8. The reverse boring cutter as set forth in claim 1, wherein: the tool apron (2) is positioned at one side, in contact with a workpiece, of the cutting edge of the reverse boring blade (13) and is hollowed to form a chip groove.

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