A high-efficiency self-rotating boring head spindle

Abstract

This invention discloses a high-efficiency self-rotating boring head spindle, comprising a cylinder with an internal sealed cavity, a guide sleeve rotatably connected to the outer periphery of the cylinder, a spindle rotatably connected inside the cylinder, and a drive motor and a cutter head connected to both ends of the spindle. The drive motors are both located within the sealed cavity, while the cutter head is located outside the sealed cavity. A boring bar is connected to the rear end of the cylinder, and the workpiece is fitted onto the guide sleeve. This invention integrates the drive motors within the spindle, allowing the drive motors to directly drive the cutter head to rotate, resulting in higher energy utilization. Simultaneously, the guide sleeve positions the workpiece, allowing it to rotate synchronously with the spindle. During boring operations, both the workpiece and the cutter head can rotate, significantly increasing boring efficiency.

Description

Technical Field

[0001] This invention relates to the field of boring technology, and in particular to a high-efficiency self-rotating boring head spindle. Background Technology

[0002] Traditional boring involves mounting the boring head on the boring bar of a boring machine, with the boring tool attached to the end of the boring head. When the inner wall of the workpiece needs to be bored, the boring machine pushes the boring head into the tubular workpiece, and the boring machine rotates the workpiece while the boring head remains fixed. This machining method has the disadvantages of low machining efficiency and long machining time. During the machining process, the boring head is subjected to continuous torque force, which can easily cause the boring tool to deform and affect the boring accuracy.

[0003] Secondly, existing boring heads typically use only one cutting size. If the cutting amount is large, the cutting surface will be rough, requiring multiple grinding processes, resulting in low boring efficiency and low boring accuracy.

[0004] Therefore, it is necessary to design a boring head structure that has both high processing efficiency and high precision. Summary of the Invention

[0005] To address the technical problems of existing boring processes that can only rotate the workpiece, resulting in slow grinding speeds between the boring head and the workpiece, long processing times, and low processing accuracy, this invention provides a high-efficiency self-rotating boring head spindle to solve these problems.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a high-efficiency self-rotating boring head spindle, including a cylinder with a sealed cavity inside, a guide sleeve rotatably connected to the outer periphery of the cylinder, a main shaft rotatably connected to the cylinder, and a drive motor and a cutter head connected to both ends of the main shaft. The drive motors are all located in the sealed cavity, the cutter head is located outside the sealed cavity, the rear end of the cylinder is connected to the boring bar, and the workpiece is sleeved outside the guide sleeve.

[0007] In an optional embodiment of the present invention, the cutter head is provided with at least two cutting grooves for mounting blades, and the distance from the end of each blade to the center of the cutter head is equal.

[0008] In an optional embodiment of the present invention, the cutter head is provided with at least two cutting grooves for mounting blades, and the distance from the end of the blade to the center of the cutter head is not exactly equal.

[0009] In an optional embodiment of the present invention, at least two sets of cutting grooves are arranged symmetrically at the center. The distance from the end of the blade in the two mutually symmetrical cutting grooves to the center of the cutting disc is equal, and the distance from the end of the blade in different sets of cutting grooves to the center of the cutting disc increases in an arithmetic sequence.

[0010] In an optional embodiment of the present invention, the shaft sleeve includes a fixed sleeve, a cover plate located at the front end of the fixed sleeve, a baffle plate located at the rear end of the fixed sleeve, and a flange connected to the boring bar. The inner diameter of the boring bar is larger than the inner diameter of the fixed sleeve. The cover plate has a shaft hole at its center for the spindle to extend out. The fixed sleeve has several axially penetrating cooling channels that communicate with the interior of the boring bar.

[0011] In an optional embodiment of the present invention, the fixed sleeve is provided with a motor mounting plate, a bearing pressure plate and a first bearing. The first bearing is connected between the main shaft and the fixed sleeve. The main shaft and the bearing pressure plate press against both ends of the inner support of the first bearing. The cover plate and the motor mounting plate press against both ends of the outer support of the first bearing. The drive motor is fixed to the motor mounting plate.

[0012] In an optional embodiment of the present invention, the spindle is hollow inside, a bearing pressure plate is sealed at the end of the spindle, and the rotating shaft of the drive motor is fixed to the bearing pressure plate.

[0013] In an optional embodiment of the present invention, the guide sleeve includes an inner guide sleeve and an outer guide sleeve. The inner guide sleeve is rotatably connected to the shaft cylinder through a second bearing, and the outer guide sleeve is fixed to the inner guide sleeve. Cooling chambers are provided between the inner guide sleeve and the main shaft, and between the inner guide sleeve and the outer guide sleeve.

[0014] The beneficial effects of this invention are:

[0015] (1) The present invention integrates the drive motor into the spindle, and the drive motor directly drives the cutter head to rotate, which has a higher energy utilization rate. At the same time, the workpiece is positioned by the guide sleeve and rotates synchronously with the workpiece. During boring, both the workpiece and the cutter head can rotate, which greatly increases the boring efficiency.

[0016] (2) The present invention forms a sealed cavity inside the spindle, and places the spindle and drive motor inside the sealed cavity. Coolant will not enter the sealed cavity, thus ensuring the service life of the drive motor.

[0017] (3) The present invention reduces the amount of cutting per pass and improves the boring accuracy by designing unequal feed rates of multiple cutting tools. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is an axial sectional view of a specific embodiment of the high-efficiency self-rotating boring head spindle described in this invention;

[0020] Figure 2 This is a side view of a specific embodiment of the high-efficiency self-rotating boring head spindle described in this invention.

[0021] In the figure, 1. Sealed cavity, 2. Shaft sleeve, 201. Fixed sleeve, 202. Cover plate, 203. Water baffle, 204. Flange, 3. Guide sleeve, 301. Inner guide sleeve, 302. Outer guide sleeve, 4. Main shaft, 5. Drive motor, 6. Cutter head, 601. Circular disc, 602. Side wing, 7. Boring bar, 8. Tool groove, 9. Shaft hole, 10. Cooling channel, 11. Motor mounting plate, 12. Bearing pressure plate, 13. First bearing, 14. Second bearing, 15. Cooling cavity, 16. Bearing spacer. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] Example 1

[0024] like Figures 1-2 As shown, a high-efficiency self-rotating boring head spindle includes a cylinder 2 with a sealed cavity 1 inside, a guide sleeve 3 rotatably connected to the outer periphery of the cylinder 2, a main shaft 4 rotatably connected inside the cylinder 2, and a drive motor 5 and a cutter head 6 connected to both ends of the main shaft 4. The drive motor 5 is located inside the sealed cavity 1, the cutter head 6 is located outside the sealed cavity 1, the rear end of the cylinder 2 is connected to the boring bar 7, and the workpiece is sleeved outside the guide sleeve 3.

[0025] The guide sleeve 3 is interference-fitted at the end of the workpiece, serving as a guide and positioning element for the workpiece. It rotates synchronously with the workpiece. Since the guide sleeve 3 is rotatably connected to the shaft cylinder 2, the shaft cylinder 2 does not rotate with the guide sleeve 3. The shaft cylinder 2 is a fixed structure connected to the boring bar 7. The spindle 4 drives the cutter head 6 to rotate under the drive of the drive motor 5. The rotation direction of the cutter head 6 and the workpiece is different, which can speed up the boring speed and reduce the number of rotations required for the workpiece. In addition, the spindle 4 is relatively short, and the drive motor 5 is close to the cutter head 6. The output torque of the drive motor 5 can be almost completely transmitted to the cutter head 6, which greatly improves the energy utilization rate, reduces the possibility of bending deformation of the spindle 4, and improves the boring accuracy.

[0026] In this embodiment, the cutter head 6 preferably has at least two tool slots 8 for mounting cutting inserts. The distance from the end of each cutting insert to the center of the cutter head 6 is equal, meaning that the feed rate of each cutting insert is the same, directly machining the inner hole of the workpiece to the corresponding size of the cutting insert. The purpose is to increase the boring speed by increasing the number of cutting inserts.

[0027] like Figure 2As shown, the cutter head 6 includes a circular disk surface 601 and side wings 602 located on the outer periphery of the circular disk surface 601. The circular disk surface 601 is coaxial with the main shaft 4. The cutter groove 8 is located on the side wings 602 and extends radially to the outer edge of the side wings 602. The side wings 602 and the cutter groove 8 are preferably arranged centrally symmetrically.

[0028] Example 2

[0029] The difference between this embodiment and Embodiment 1 is that the distances from the ends of the multiple cutting blades to the center of the cutter head 6 are not completely equal. That is, the feed rates of the cutting blades are not completely equal, so that multiple feed rates can be used sequentially to cut the inner surface of the workpiece, making the workpiece surface smoother and improving the boring accuracy.

[0030] In further design, at least two sets of tool slots 8 are centrally symmetrically arranged. The distance from the tip of the blade in each of the two centrally symmetrical tool slots 8 to the center of the cutter head 6 is equal. The distance from the tip of the blade in different sets of tool slots 8 to the center of the cutter head 6 increases in an arithmetic progression. Figure 2 As shown, two side wings 602 are symmetrically arranged on both sides of the circular disk 601. Each side wing 602 has three cutting grooves 8. The cutting grooves 8 of one side wing 602 are arranged in a centrally symmetrical one-to-one correspondence with the cutting grooves 8 of the other side wing 602. The feed amount of the three blades installed in the same side wing 602 increases in an arithmetic sequence.

[0031] Example 3

[0032] Based on the above embodiments, in order to facilitate the disassembly and assembly of the internal structure of the shaft cylinder 2, the shaft cylinder 2 in this embodiment includes a fixed sleeve 201, a cover plate 202 located at the front end of the fixed sleeve 201, a baffle plate 203 located at the rear end of the fixed sleeve 201, and a flange 204 connected to the boring bar 7. The cover plate 202 has a shaft hole 9 at its center for the main shaft 4 to extend out. The cover plate 202, the fixed sleeve 201, and the baffle plate 203 form a sealed cavity 1. A sealing ring is provided between the cover plate 202 and the fixed sleeve 201, and between the fixed sleeve 201 and the baffle plate 203 to ensure the sealing.

[0033] Since coolant needs to be introduced into the boring bar 7, in this embodiment, the inner diameter of the boring bar 7 is larger than the inner diameter of the fixing sleeve 201. Therefore, the end of the fixing sleeve 201 has a cross-sectional area located inside the boring bar 7. The fixing sleeve 201 has several axially penetrating cooling channels 10 that communicate with the interior of the boring bar 7. These cooling channels 10 not only provide coolant to the boring bar 7 but also cool the interior of the fixing sleeve 201 during coolant delivery.

[0034] Installation of the fixing sleeve 201 and the spindle 4:

[0035] The fixed sleeve 201 contains a motor mounting plate 11, a bearing pressure plate 12, and a first bearing 13. The first bearing 13 is connected between the main shaft 4 and the fixed sleeve 201. The main shaft 4 and the bearing pressure plate 12 press against both ends of the inner support of the first bearing 13, and the cover plate 202 and the motor mounting plate 11 press against both ends of the outer support of the first bearing 13. The drive motor 5 is fixed to the motor mounting plate 11. Figure 1 As shown, the left end of the main shaft 4 has a radially protruding large shaft, and the inner support of the first bearing 13 abuts against the end of the large shaft. There are two first bearings 13 arranged in front and behind, and the two first bearings 13 are separated by a bearing spacer 16.

[0036] To reduce overall weight and temperature rise, preferably, the spindle 4 is hollow inside, the bearing pressure plate 12 is sealed at the end of the spindle 4, and the rotating shaft of the drive motor 5 is fixed to the bearing pressure plate 12.

[0037] Structure of guide sleeve 3:

[0038] The guide sleeve 3 includes an inner guide sleeve 301 and an outer guide sleeve 302. The inner guide sleeve 301 is rotatably connected to the shaft cylinder 2 via a second bearing 14. The outer guide sleeve 302 is fixed to the inner guide sleeve 3. Cooling chambers 15 are provided between the inner guide sleeve 3 and the main shaft 4, and between the inner guide sleeve 3 and the outer guide sleeve 3. The inner guide sleeve 301 is used to achieve the rotatable connection with the shaft cylinder 2, and the outer guide sleeve 302 is used to adapt to the inner diameter of the workpiece. The outer guide sleeve 302 can be replaced according to the workpiece model.

[0039] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0040] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0041] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A high efficiency spin head spindle, characterized by: The application relates to a rotary tooling device, which comprises a shaft cylinder (2) with a sealed cavity (1) inside, a guide sleeve (3) rotatably connected to the outer periphery of the shaft cylinder (2), a main shaft (4) rotatably connected to the inside of the shaft cylinder (2), a driving motor (5) and a cutter head (6) connected to the two ends of the main shaft (4), the driving motor (5) is located in the sealed cavity (1), the cutter head (6) is located outside the sealed cavity (1), the rear end of the shaft cylinder (2) is connected with a boring bar (7), a workpiece is sleeved outside the guide sleeve (3), the shaft cylinder (2) is fixed with the boring bar (7), the cutter head (6) is coaxially arranged with the main shaft (4) and is rotatably connected with the shaft cylinder (2), the guide sleeve (3) is used for supporting the workpiece so as to stably rotate the workpiece. The shaft cylinder (2) comprises a fixed sleeve (201), a cover plate (202) located at the front end of the fixed sleeve (201), a water baffle (203) located at the rear end of the fixed sleeve (201) and a flange (204) connected with the boring bar (7), the inner diameter of the boring bar (7) is larger than the inner diameter of the fixed sleeve (201), the cover plate (202) is provided with a shaft hole (9) in the center for the main shaft (4) to extend out, and the fixed sleeve (201) is provided with a plurality of cooling channels (10) which are axially through and communicate with the inside of the boring bar (7). The guide sleeve (3) comprises an inner guide sleeve (301) and an outer guide sleeve (302), the inner guide sleeve (301) is rotatably connected with the shaft cylinder (2) through a second bearing (14), and the outer guide sleeve (302) is fixed with the inner guide sleeve (3), and the inner guide sleeve (3) and the outer guide sleeve (3) are provided with a cooling cavity (15) between the inner guide sleeve (3) and the main shaft (4).

2. The high efficiency spin turn head spindle of claim 1 wherein: The cutter head (6) is provided with at least two cutter grooves (8) for mounting cutter blades, and the distances from the ends of each cutter blade to the center of the cutter head (6) are equal.

3. The high efficiency spin turn head spindle of claim 1 wherein: The cutter head (6) is provided with at least two cutter grooves (8) for mounting cutter blades, and the distances from the ends of the cutter blades to the center of the cutter head (6) are not completely equal.

4. The high efficiency spin turn head spindle of claim 3 wherein: The cutter grooves (8) are symmetrically arranged in at least two groups, the distances from the ends of the cutter blades in the two cutter grooves (8) which are symmetrically arranged are equal, and the distances from the ends of the cutter blades in different groups of cutter grooves (8) to the center of the cutter head (6) are in an arithmetic progression.

5. The high efficiency spin turn head spindle of claim 1 wherein: The fixed sleeve (201) is internally provided with a motor mounting plate (11), a bearing pressing plate (12) and a first bearing (13), the first bearing (13) is connected between the main shaft (4) and the fixed sleeve (201), the main shaft (4) and the bearing pressing plate (12) are pressed on the two ends of the inner support of the first bearing (13), the cover plate (202) and the motor mounting plate (11) are pressed on the two ends of the outer support of the first bearing (13), and the driving motor (5) is fixed with the motor mounting plate (11).

6. The high efficiency spin turn head spindle of claim 5 wherein: The main shaft (4) is internally hollow, the bearing pressing plate (12) is blocked at the end of the main shaft (4), and the rotating shaft of the driving motor (5) is fixed with the bearing pressing plate (12).

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