High-precision boring head

Abstract

The utility model discloses a high-precision boring head, which belongs to the field of boring heads and comprises a boring head main body, two parallel lead screw grooves are arranged at the front end of the boring head main body, and the two lead screw grooves are symmetrically arranged relative to the circle center of the boring head main body; a boring cutter lead screw and a balance weight lead screw are arranged in the two lead screw grooves respectively and are opposite in rotating direction, a boring cutter nut is connected to the boring cutter lead screw in a threaded mode, a balance weight nut is connected to the balance weight lead screw in a threaded mode, and the distance between the gravity center of the boring cutter nut and the circle center of the boring head body is equal to the distance between the gravity center of the balance weight nut and the circle center of the boring head body. The upper end of the boring cutter nut is integrally connected with a boring cutter seat, the upper end face of the boring cutter seat is located above the middle position of the two lead screw grooves, the boring cutter seat is connected with a boring cutter block, the boring cutter block is provided with a boring cutter, and the total weight of the boring cutter, the boring cutter block, the boring cutter seat and the boring cutter nut is equal to the weight of the counterweight nut; the boring head body is further provided with a driving device which drives the balance weight lead screw and the boring cutter lead screw to rotate at the same time. The structure can avoid centrifugal force caused by rotation of the boring head, and further improves the machining precision.

Description

Technical Field

[0001] The utility model relates to the field of boring heads, in particular to a high-precision boring head. Background Art

[0002] At present, due to structural limitations, boring heads are often unable to achieve high-speed rotation requirements and high-precision boring processing. The main reason is that when the boring cutter moves on the boring head, the boring head becomes eccentric. Since the centrifugal force increases when the boring head rotates at a high speed, the faster the speed, the more likely it is to vibrate, thus affecting the actual processing. In order to solve the above problems, a counterweight is currently added to the boring head to balance the boring cutter. However, in the actual processing process, the boring cutter needs to move on the boring head, while the counterweight can only be fixed on the boring head, resulting in eccentricity when the boring cutter moves.

[0003] In view of the above problems in the prior art, the utility model designs and manufactures a high-precision boring head to overcome the above defects. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the utility model provides a high-precision boring head, on which a counterweight block capable of being linked with a boring cutter is arranged, thereby avoiding centrifugal force caused by the rotation of the boring head and further improving the processing accuracy.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: a high-precision boring head, comprising a boring head body, the front end of the boring head body is provided with two parallel screw grooves, and the two screw grooves are symmetrically arranged relative to the center of the boring head body;

[0006] A boring tool screw and a counterweight screw are respectively arranged in the two screw grooves, the boring tool screw and the counterweight screw have opposite rotation directions, a boring tool nut is screwed on the boring tool screw, and a counterweight nut is screwed on the counterweight screw, and the distance between the center of gravity of the boring tool nut and the center of the boring head body is equal to the distance between the center of gravity of the counterweight nut and the center of the boring head body;

[0007] The upper end of the boring tool nut is integrally connected with a boring tool seat, the boring tool seat extends from one side of the boring tool nut to the middle position of the two screw grooves, the upper end surface of the boring tool seat is located above the middle position of the two screw grooves, the boring tool seat is connected with a boring block, the boring tool block is provided with a boring tool, and the total weight of the boring tool, boring tool block, boring tool seat and boring tool nut is equal to the weight of the counterweight nut;

[0008] The boring head body is also provided with a motor installation cavity, in which a motor is installed. The motor drives the counterweight screw and the boring tool screw to rotate simultaneously through a transmission mechanism.

[0009] Preferably, the screw groove comprises a semicircular arc groove, the boring tool screw and the counterweight screw are respectively located in two semicircular arc grooves, and the diameter of the semicircular arc groove is slightly larger than the diameter of the boring tool screw and the counterweight screw;

[0010] A guide slot is provided on the outer side of the semicircular slot, the width of which is greater than the diameter of the semicircular slot, and the counterweight nut and the boring tool nut can be guided and slid in the guide slot through the counterweight screw and the boring tool screw respectively.

[0011] Preferably, two pressing plates are provided at the front end of the boring head body, and the two pressing plates can respectively restrict the boring tool nut and the counterweight nut from being separated from the guide slot;

[0012] A gap is provided between the two pressing plates, and the boring block can slide in the gap.

[0013] Preferably, a lubricating oil groove is provided on the contact surface between the counterweight nut and the guide slide groove and the contact surface between the counterweight nut and the pressure plate;

[0014] The contact surface between the boring tool nut and the guide slide groove and the contact surface between the boring tool nut and the pressing plate are provided with lubricating oil grooves;

[0015] A lubricating medium is arranged in the lubricating oil groove.

[0016] Preferably, both ends of the two screw grooves are provided with vertical plates, the vertical plates are provided with a plurality of connecting holes, and the boring screw and the counterweight screw are connected to the connecting holes through bearings;

[0017] The same end of the counterweight screw and the boring tool screw extends outward from the vertical plate for a section and is respectively connected to a driven gear;

[0018] A driving gear is connected to the motor shaft of the motor, and the driving gear is meshed with two driven gears at the same time. The motor drives the counterweight screw and the boring tool screw to rotate synchronously through the driving gear and the driven gear.

[0019] Preferably, a suspended space is provided between the motor and the bottom of the motor installation cavity, and the motor is suspended and installed in the motor installation cavity through a motor mounting frame;

[0020] Both ends of the suspended space are provided with a protection belt steering connection block, the outer side of the protection belt steering connection block protrudes from the vertical plate and the driving gear and the driven gear, and a protection belt walking gap is provided between the bottom of the protection belt steering connection block and the bottom of the motor installation cavity;

[0021] Steering shafts are provided at both ends of the interval, and the two ends of the steering shafts are connected to two pressure plates. The distance between the steering shaft close to the driven gear and the center of the boring head body is greater than the distance between the outer end of the driven gear and the center of the boring head body, and a gap is provided between the other steering shaft and the adjacent vertical plate;

[0022] It also includes a circle of protection belt, which is wound around two steering shafts and two protection belt steering connecting blocks, and the boring tool seat is connected to the protection belt.

[0023] Preferably, the guard belt steering connection block is provided with an arc transition surface at the guard belt steering position.

[0024] Preferably, a groove is provided on one side of the two pressing plates close to the other pressing plate, and both sides of the protection belt can extend into the groove.

[0025] Preferably, it further comprises an electric spindle, and the rear end of the boring head body is connected to the front end of the electric spindle.

[0026] Preferably, it also includes an electric slip ring, which is connected to the rear end of the electric spindle and can be connected to the motor through a wire.

[0027] The utility model is beneficial in that:

[0028] 1. The utility model utilizes a boring tool screw and a counterweight screw with opposite rotation directions. A boring tool nut and a boring tool are arranged on the boring tool screw, and a counterweight nut is arranged on the counterweight screw, so that when the boring tool moves, the counterweight nut can move synchronously, and the stability of the center of gravity position of the boring head is always maintained, thereby realizing high-precision boring processing and improving the processing accuracy.

[0029] 2. The boring tool nut and the counterweight nut of the utility model are guided and positioned by the guide slide groove, thereby ensuring the accuracy of the boring tool nut and the counterweight nut during the sliding process.

[0030] 3. The utility model utilizes a circle of protective belt to protect the components at the rear end of the interval, and the protective belt can move with the boring tool seat, thereby preventing debris and the like from entering the interior of the boring head body during the processing, thereby ensuring the internal environment and service life of the boring head. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a high-precision boring head;

[0032] Figure 2 It is a structural schematic diagram of a high-precision boring head without a protective cover;

[0033] Figure 3 It is a structural schematic diagram of a high-precision boring head without a protective cover and a pressure plate;

[0034] Figure 4This is a front view of a high-precision boring head without a protective cover and a pressure plate;

[0035] Figure 5 A schematic diagram of the internal structure of a high-precision boring head without the boring head body;

[0036] Figure 6 The internal front view of a high-precision boring head without the boring head body;

[0037] Figure 7 An internal side view of a high precision boring head with the boring head body removed;

[0038] Figure 8 A schematic diagram of the internal structure of a high-precision boring head without the boring head body and the protective belt;

[0039] Fig. 9 It is a structural schematic diagram of a high-precision boring head and a boring head main body;

[0040] Fig.10 It is a side view of the main body of a high-precision boring head;

[0041] Fig.11 It is a structural schematic diagram of a high-precision boring head, boring cutter nut and boring cutter seat;

[0042] Fig.12 The figure is a front view of a high-precision boring head, boring cutter nut and boring cutter seat;

[0043] Fig.13 A schematic diagram of a high-precision boring head pressure plate;

[0044] Fig.14 A cross-sectional view of a high-precision boring head pressure plate.

[0045] In the figure: 1-electric spindle, 2-electric slip ring, 3-boring head body, 4-protective cover, 5-pressure plate, 6-boring block, 7-boring tool, 8-protective belt, 9-counterweight nut, 10-steering shaft, 11-protective belt steering connecting block, 12-driving gear, 13-driven gear, 14-vertical plate, 15-boring tool nut, 16-boring tool screw, 17-counterweight screw, 18-motor, 19-intermediate wheel, 20-boring tool seat, 31-motor installation cavity, 32-screw groove, 33-guide slide groove, 51-groove, 151-lubricating column hole. DETAILED DESCRIPTION

[0046] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0047] like Figures 1 to 14As shown, a high-precision boring head includes a boring head body 3, which is approximately a cylindrical block as a whole. Two parallel screw grooves 32 are provided at the front end of the boring head body 3, and the two screw grooves 32 are symmetrically arranged relative to the center of the boring head body 3.

[0048] A boring tool screw 16 and a counterweight screw 17 are respectively provided in the two screw grooves 32. The boring tool screw 16 and the counterweight screw 17 have opposite rotation directions. A boring tool nut 15 is screwed on the boring tool screw 16, and a counterweight nut 9 is screwed on the counterweight screw 17. The distance between the center of gravity of the boring tool nut 15 and the center of the boring head body 3 is equal to the distance between the center of gravity of the counterweight nut 9 and the center of the boring head body 3.

[0049] The upper end of the boring tool nut 15 is integrally connected with a boring tool seat 20, which extends from one side of the boring tool nut 15 to the middle position of the two screw grooves 32, and the upper end surface of the boring tool seat 20 is located above the middle position of the two screw grooves 32. The boring tool seat 20 is connected with a boring block 6, and the boring tool block 6 is provided with a boring tool 7. The total weight of the boring tool 7, the boring tool block 6, the boring tool seat 20 and the boring tool nut 15 is equal to the weight of the counterweight nut 9;

[0050] A motor installation cavity 31 is also provided on the boring head body 3. A motor 18 is installed in the motor installation cavity 31. The motor 18 drives the counterweight screw 17 and the boring tool screw 16 to rotate simultaneously through a transmission mechanism.

[0051] The utility model utilizes a boring tool lead screw 16 and a counterweight lead screw 17 with opposite rotation directions, a boring tool nut 15 and a boring tool 7 are arranged on the boring tool lead screw 16, and a counterweight nut 9 is arranged on the counterweight lead screw 17, so that when the boring tool 7 moves, the counterweight nut 9 can move synchronously, and the stability of the center of gravity position of the boring head is always maintained, thereby realizing high-precision boring processing and improving the processing accuracy.

[0052] The screw groove 32 of the utility model specifically includes a semicircular arc groove, the boring tool screw 16 and the counterweight screw 17 are respectively located in the two semicircular arc grooves, the diameter of the semicircular arc groove is slightly larger than the diameter of the boring tool screw 16 and the counterweight screw 17, and a guide groove 33 is provided on the outer side of the semicircular arc groove, and the width of the guide groove 33 is larger than the diameter of the semicircular arc groove. The counterweight nut 9 and the boring tool nut 15 can be guided and slid in the guide groove 33 through the counterweight screw 17 and the boring tool screw 16 respectively, thereby ensuring the accuracy of the boring tool nut 15 and the counterweight nut 9 during the sliding process.

[0053] Furthermore, two pressure plates 5 are provided at the front end of the boring head body 3. The two pressure plates 5 can respectively limit the boring tool nut 15 and the counterweight nut 9 from detaching from the guide groove 33, and can also protect the structure behind the pressure plate 5. A gap is provided between the two pressure plates 5, and the boring tool block 6 can slide in the gap.

[0054] The utility model provides lubricating oil grooves on the contact surfaces of the counterweight nut 9 and the guide groove 33 and the contact surfaces with the pressure plate 5. The contact surfaces of the boring tool nut 15 and the guide groove 33 and the contact surfaces with the pressure plate 5 are provided with lubricating oil grooves. Lubricating medium is provided in the lubricating oil grooves to ensure the lubrication of relative motion. Preferably, a plurality of lubricating column holes 151 are provided on the upper end surface of the boring tool nut 15 or the counterweight nut 9, and their specific positions correspond to the contact positions with the pressure plate 5. Preferably, a copper column is provided in the lubricating column hole 151, and a compression spring is provided between the bottom of the copper column and the bottom of the lubricating column hole 151, so that the boring tool nut 15 or the counterweight nut 9 and the pressure plate 5 are always guaranteed to have lubricated copper surface contact.

[0055] Both ends of the two screw grooves 32 are provided with vertical plates 14, and a plurality of connecting holes are provided on the vertical plates 14. The boring tool screw 16 and the counterweight screw 17 are connected to the connecting holes through bearings. The same end of the counterweight screw 17 and the boring tool screw 16 extends outward from the vertical plate 14 for a section and is respectively connected to a driven gear 13. The motor shaft of the motor 18 is connected with a driving gear 12, and the driving gear 12 is meshed with the two driven gears 13 at the same time. Of course, in order to ensure the meshing of the driving gear 12 with the two driven gears 13, a structure of intermediate wheel 19 can also be added between the driving gear 12 and the driven gear 13. The motor 18 drives the counterweight screw 17 and the boring tool screw 16 to rotate synchronously through the driving gear 12 and the driven gear 13. The motor mounting cavity 31 of the utility model is preferably independent of the screw groove 32, and the center of gravity position of the motor 18 when installed preferably coincides with the center position of the boring head body 3.

[0056] A suspended space is preferably provided between the motor 18 and the bottom of the motor installation cavity 31. The motor 18 is suspended in the motor installation cavity 31 through a motor mounting frame. The utility model provides a protective belt steering connection block 11 at both ends of the suspended space. The outer side of the protective belt steering connection block 11 protrudes from the vertical plate 14, the driving gear 12 and the driven gear 13. A protective belt walking gap is provided between the bottom of the protective belt steering connection block 11 and the bottom of the motor installation cavity 31.

[0057] Steering shafts 10 are provided at both ends of the interval of the utility model, and both ends of the steering shaft 10 are connected to two pressure plates 5. The distance between the steering shaft 10 close to the driven gear 13 and the center of the boring head body 3 is greater than the distance between the outer end of the driven gear 13 and the center of the boring head body 3. The purpose is to form a gap between the steering shaft 10 and the driven gear 13. A gap is also provided between the other steering shaft 10 and the adjacent vertical plate 14. A circle of protective belt 8 is also included. The circle of protective belt 8 is wound around the two steering shafts 10 and the two protective belt steering connecting blocks 11. The boring tool seat 20 is connected to the protective belt 8. In this way, when the boring tool 7 moves, the protective belt 8 also keeps a synchronous movement state. The circle of protective belt 8 is used to protect the components at the rear end of the interval, so that debris and the like are prevented from entering the interior of the boring head body 3 during the processing, thereby ensuring the environment inside the boring head and the service life.

[0058] In order to avoid scratching the guard strip 8 , the guard strip deflection connecting block 11 is preferably provided with an arc transition surface at the deflection position of the guard strip 8 .

[0059] In order to further improve the protective effect of the protective belt 8 on the interval between the pressure plates 5, a groove 51 is provided on one side of the two pressure plates 5 close to the other pressure plate 5, and both sides of the protective belt 8 can extend into the groove 51, thereby preventing debris from entering the boring head through the gap between the protective belt 8 and the pressure plate 5, and the movement of the protective belt 8 in the groove 51 will not be affected.

[0060] The utility model also includes an electric spindle 1, the rear end of a boring head body 3 is connected to the front end of the electric spindle 1, and also includes an electric slip ring 2, which is connected to the rear end of the electric spindle 1 and can be connected to the motor 18 through a wire to prevent the rotation of the boring head body 3 from affecting the power supply of the motor 18.

[0061] In order to prevent debris from entering the boring head from the screw slot 32 of the boring head body 3, the motor installation cavity 31, and the two ends of the guide slot 33, the utility model preferably provides a circle of protective cover 4 on the outside of the boring head body 3 for protection.

[0062] It should be understood that the purpose of these embodiments is only to illustrate the utility model and is not intended to limit the protection scope of the utility model. In addition, it should also be understood that after reading the technical content of the utility model, those skilled in the art can make various changes, modifications and / or variations to the utility model, and all of these equivalent forms also fall within the protection scope defined by the claims attached to this application.

Claims

1. A high-precision boring head, characterized in that: It comprises a boring head body (3), wherein the front end of the boring head body (3) is provided with two parallel screw grooves (32), and the two screw grooves (32) are symmetrically arranged relative to the center of the boring head body (3); A boring tool screw (16) and a counterweight screw (17) are respectively arranged in the two screw grooves (32); the boring tool screw (16) and the counterweight screw (17) have opposite rotation directions; a boring tool nut (15) is screwed onto the boring tool screw (16); a counterweight nut (9) is screwed onto the counterweight screw (17); the distance between the center of gravity of the boring tool nut (15) and the center of the boring head body (3) is equal to the distance between the center of gravity of the counterweight nut (9) and the center of the boring head body (3); The upper end of the boring tool nut (15) is integrally connected with a boring tool seat (20), the boring tool seat (20) extends from one side of the boring tool nut (15) to the middle position of the two screw grooves (32), the upper end surface of the boring tool seat (20) is located above the middle position of the two screw grooves (32), the boring tool seat (20) is connected to a boring block (6), the boring tool block (6) is provided with a boring tool (7), and the total weight of the boring tool (7), the boring tool block (6), the boring tool seat (20) and the boring tool nut (15) is equal to the weight of the counterweight nut (9); The boring head body (3) is also provided with a motor installation cavity (31), in which a motor (18) is installed. The motor (18) drives the counterweight screw (17) and the boring tool screw (16) to rotate simultaneously through a transmission mechanism.

2. A high-precision boring head according to claim 1, characterized in that: The screw groove (32) comprises a semicircular arc groove, the boring tool screw (16) and the counterweight screw (17) are respectively located in the two semicircular arc grooves, and the diameter of the semicircular arc groove is slightly larger than the diameter of the boring tool screw (16) and the counterweight screw (17); A guide slot (33) is provided on the outer side of the semicircular arc groove, the width of the guide slot (33) is greater than the diameter of the semicircular arc groove, and the counterweight nut (9) and the boring tool nut (15) can be guided and slid in the guide slot (33) through the counterweight screw (17) and the boring tool screw (16) respectively.

3. A high-precision boring head according to claim 2, characterized in that: Two pressing plates (5) are provided at the front end of the boring head body (3), and the two pressing plates (5) can respectively restrict the boring tool nut (15) and the counterweight nut (9) from detaching from the guide slot (33); A gap is provided between the two pressing plates (5), and the boring block (6) can slide in the gap.

4. A high-precision boring head according to claim 3, characterized in that: The contact surface between the counterweight nut (9) and the guide slide groove (33) and the contact surface between the counterweight nut (9) and the pressure plate (5) are both provided with lubricating oil grooves; The contact surface between the boring tool nut (15) and the guide slide groove (33) and the contact surface between the boring tool nut (15) and the pressure plate (5) are both provided with lubricating oil grooves; A lubricating medium is arranged in the lubricating oil groove.

5. A high-precision boring head according to claim 3, characterized in that: Both ends of the two screw grooves (32) are provided with vertical plates (14), and the vertical plates (14) are provided with a plurality of connecting holes, and the boring tool screw (16) and the counterweight screw (17) are connected to the connecting holes through bearings; The same end of the counterweight screw (17) and the boring tool screw (16) extends outward from the vertical plate (14) and is respectively connected to two driven gears (13); A driving gear (12) is connected to the motor shaft of the motor (18), and the driving gear (12) is meshed with two driven gears (13) at the same time. The motor (18) drives the counterweight screw (17) and the boring tool screw (16) to rotate synchronously through the driving gear (12) and the driven gear (13).

6. A high-precision boring head according to claim 5, characterized in that: A suspended space is provided between the motor (18) and the bottom of the motor installation cavity (31), and the motor (18) is suspended and installed in the motor installation cavity (31) via a motor installation frame; Both ends of the suspended space are provided with a protection belt steering connection block (11), the outer side of the protection belt steering connection block (11) protrudes from the vertical plate (14) and the driving gear (12) and the driven gear (13), and a protection belt running gap is provided between the bottom of the protection belt steering connection block (11) and the bottom of the motor installation cavity (31); Steering shafts (10) are provided at both ends of the interval, and both ends of the steering shaft (10) are connected to two pressure plates (5). The distance between the steering shaft (10) close to the driven gear (13) and the center of the boring head body (3) is greater than the distance between the outer end of the driven gear (13) and the center of the boring head body (3). A gap is provided between the other steering shaft (10) and the adjacent vertical plate (14); It also comprises a circle of protection belt (8), which is wound around two steering shafts (10) and two protection belt steering connecting blocks (11), and the boring tool seat (20) is connected to the protection belt (8).

7. A high-precision boring head according to claim 6, characterized in that: The protection belt steering connection block (11) is provided with an arc transition surface at the steering position of the protection belt (8).

8. A high-precision boring head according to claim 6, characterized in that: A groove (51) is provided on one side of the two pressing plates (5) close to the other pressing plate (5), and both sides of the protection belt (8) can extend into the groove (51).

9. A high-precision boring head according to claim 1, characterized in that: It also comprises an electric spindle (1), and the rear end of the boring head body (3) is connected to the front end of the electric spindle (1).

10. A high-precision boring head according to claim 9, characterized in that: It also comprises an electric slip ring (2), which is connected to the rear end of the electric spindle (1), and the electric slip ring (2) can be connected to the motor (18) via a wire.

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