Large long hole loading boring bar mechanism

Abstract

The invention discloses a large long hole loading boring bar mechanism which is characterized in that two supporting seats are oppositely arranged, pivotal bearings are mounted on the supporting seats, outer rings of the pivotal bearings are fixedly connected with the corresponding supporting seats, and transmission shaft sleeves are mounted at inner rings of the pivotal bearings; the boring rod penetrates through the transmission shaft sleeves of the two supporting seats at the same time, sliding keys are fixedly connected to the inner side faces of the transmission shaft sleeves, axial long key grooves are formed in the positions, corresponding to the sliding keys, of the outer wall of the boring rod, and the sliding keys of the transmission shaft sleeves are located in the corresponding long key grooves of the boring rod; one end of the loading rod is connected with a lantern ring, a loading bearing is installed in the lantern ring, the tail end of the boring rod is fixedly connected with a loading handle, the loading handle penetrates through the loading bearing of the lantern ring, an outer ring of the loading bearing is fixedly connected with the lantern ring, and an inner ring of the loading bearing is in sliding fit with the loading handle; and the other end of the loading rod is connected with a telescopic rod of the driving cylinder. The large long hole loading boring bar mechanism can improve the hole roundness and coaxiality of large long hole finish machining.

Description

Technical Field

[0001] The invention belongs to the field of boring processing equipment, and in particular relates to a large long hole loading boring bar mechanism. Background Art

[0002] Referring to the shell structure of the ship propeller with publication number CN220549194U, when our company processes the main shell of the ship propeller, it is necessary to use a boring tool to fine-process the large long hole on the main shell. The large long hole is used to install the propeller shaft of the propeller. Therefore, the processing accuracy of the large long hole directly affects the propulsion stability of the propeller.

[0003] Existing boring tools are typically mounted on milling and boring machines via a boring bar. The high-speed rotation and feed sliding of the boring bar drive the boring tool's boring motion, thereby fine-machining these long holes. Due to the large diameter and depth of the long holes in the main housing of a ship's propeller, the boring bar's overhang is excessive, which can easily cause vibration during fine machining, leading to chattering and insufficient roundness in the machined hole. Furthermore, due to the bar's poor rigidity, an excessive overhang can cause the bar to sag, resulting in poor coaxiality in the machined hole. Summary of the Invention

[0004] Based on the content of the background technology, in order to improve the hole roundness and coaxiality of the long hole finishing, the present invention provides a long hole loading boring bar mechanism, which includes a support seat, a rotary bearing, a transmission sleeve, a boring bar, a sliding key, a loading rod, a collar, a loading bearing, a loading handle and a driving cylinder;

[0005] Two supporting seats are arranged opposite to each other, and a slewing bearing is installed on the supporting seats. The outer ring of the slewing bearing is fixedly connected to the corresponding supporting seat, and a transmission sleeve is installed on the inner ring of the slewing bearing; the boring bar passes through the transmission sleeves of the two supporting seats at the same time, and a sliding key is fixedly connected to the inner side of the transmission sleeve. The outer wall of the boring bar is provided with an axial long keyway at the corresponding position of the sliding key, and the sliding key of the transmission sleeve is located in the long keyway corresponding to the boring bar, so that the boring bar can both rotate and slide axially;

[0006] One end of the loading rod is connected to a collar, a loading bearing is installed in the collar, and the tail end of the boring bar is fixedly connected to a loading handle, which passes through the loading bearing arrangement of the collar. The outer ring of the loading bearing is fixedly connected to the collar, and the inner ring of the loading bearing is in sliding engagement with the loading handle. The arrangement of the loading bearing ensures that the loading rod does not affect the rotation of the boring bar, while the sliding engagement between the inner ring of the loading bearing and the loading handle enables the loading bearing and the loading handle to slide relative to each other, thereby preventing the loading rod from obstructing the axial feed slippage of the boring bar.

[0007] The other end of the loading rod is connected to the telescopic rod of the driving cylinder, and the cylinder end of the driving cylinder is fixedly connected to the device table. The driving cylinder is specifically a hydraulic cylinder. Under the drive of the hydraulic cylinder, the loading handle can be pulled in the vertical direction by the loading rod to adjust the deflection of the boring bar.

[0008] A boring tool is mounted on the boring bar via a boring tool seat, and the boring tool can rotate and slide along with the boring bar at high speed.

[0009] Preferably, a limiting ring is integrally connected to the outer surface of one end of the transmission sleeve, and a thread is provided on the outer surface of the other end of the transmission sleeve. After the inner ring of the corresponding slewing bearing is sleeved on the outer surface of the corresponding transmission sleeve, the limiting nut is tightened on the thread of the transmission sleeve, thereby limiting the inner ring of the slewing bearing between the limiting ring and the limiting nut of the corresponding transmission sleeve, thereby realizing the installation of the inner ring of the slewing bearing and the transmission sleeve.

[0010] Preferably, the slewing bearing is a double-row tapered roller bearing, so that the boring bar has higher slewing rotation accuracy.

[0011] Through the above technical solution, the present invention has at least the following beneficial effects:

[0012] The large long hole loading boring bar mechanism described in the technical solution of this application is a special boring mechanism specially used for machining high-precision extra-large and extra-long shell holes:

[0013] The coordinated design of the two support seats, slewing bearing, transmission sleeve and other components with the boring bar can form a good limit support for both ends of the boring bar, so that the boring bar will not vibrate radially during high-speed rotation and axial feed sliding, which can avoid the vibration tendency during fine machining and the chattering of the tool, thereby avoiding affecting the roundness of the machined hole. The use of double-row tapered roller bearings as the specific slewing bearings can enable the boring bar to maintain a high rotation accuracy. The roundness of the machined hole can be achieved within 0.05 when fine boring extra-large holes (￠2000).

[0014] Through the loading components such as the loading rod, collar, loading bearing, loading handle and drive cylinder installed at the tail end of the boring bar, the deflection value of the middle part of the boring bar can be adjusted within 0.03mm at any time through the hydraulic loading of the drive cylinder during fine machining to avoid the boring bar sagging due to excessive overhang, ultimately ensuring the straightness of the center of the machined hole and making the middle and both ends of the machined hole have excellent coaxiality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. These drawings are all simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0016] Figure 1 Schematic diagram of the overall structure of the large long hole loading boring bar mechanism described in the embodiment of the present application;

[0017] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3 for Figure 1 Enlarged view of point B in the middle. DETAILED DESCRIPTION

[0019] In the description of this application, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", and "back" indicating directions or positional relationships, they are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship are only used for illustrative purposes and cannot be understood as limiting this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this invention based on specific circumstances.

[0021] refer to Figures 1 to 3 A large long hole loading boring bar mechanism includes a support seat 1, a rotary bearing 2, a transmission sleeve 3, a boring bar 4, a sliding key 11, a loading rod 5, a collar 6, a loading bearing 10, a loading handle 7 and a driving cylinder 8.

[0022] There are two supporting seats 1 arranged opposite to each other, and a slewing bearing 2 is installed on the supporting seat 1. The outer ring of the slewing bearing 2 is fixedly connected to the corresponding supporting seat 1, and a transmission sleeve 3 is installed at the inner ring of the slewing bearing 2; the boring bar 4 is simultaneously passed through the transmission sleeves 3 of the two supporting seats 1, and a sliding key 11 is fixedly connected to the inner side surface of the transmission sleeve 3. The outer wall of the boring bar 4 is provided with an axial long keyway 401 at the corresponding position of the sliding key 11, and the sliding key 11 of the transmission sleeve 3 is located in the long keyway 401 corresponding to the boring bar 4, so that the boring bar 4 can both rotate and slide axially; the above-mentioned slewing bearing 2 specifically uses a double-row tapered roller bearing, so that the boring bar 4 has a higher rotation accuracy.

[0023] refer to Figure 2 One end of the loading rod 5 is connected to a collar 6, and a loading bearing 10 is installed in the collar 6. The tail end of the boring bar 4 is fixedly connected to a loading handle 7, and the loading handle 7 is arranged through the loading bearing 10 of the collar 6. The outer ring of the loading bearing 10 is fixedly connected to the collar 6, and the inner ring of the loading bearing 10 is slidably fitted with the loading handle 7. The arrangement of the loading bearing 10 ensures that the loading rod 5 does not affect the rotation of the boring bar 4, and the sliding fit between the inner ring of the loading bearing 10 and the loading handle 7 enables the loading bearing 10 and the loading handle 7 to slide relative to each other, thereby preventing the loading rod 5 from hindering the axial feed slippage of the boring bar 4.

[0024] The other end of the loading rod 5 is connected to the telescopic rod of the driving cylinder 8, and the cylinder end of the driving cylinder 8 is fixedly connected to the device table. The driving cylinder 8 is specifically a hydraulic cylinder. Under the drive of the hydraulic cylinder, the loading handle 7 can be pulled in the vertical direction through the loading rod 5 to adjust the deflection of the boring bar 4.

[0025] A boring tool is mounted on the boring bar 4 via a boring tool holder 9 , and the boring tool can rotate and slide along with the boring bar 4 at high speed.

[0026] In this specific embodiment, refer to Figure 3 A limiting ring 301 is integrally connected to the outer surface of one end of the transmission sleeve 3, and a thread is provided on the outer surface of the other end of the transmission sleeve 3. After the inner ring of the corresponding slewing bearing 2 is sleeved on the outer surface of the corresponding transmission sleeve 3, the limiting nut 12 is tightened on the thread of the transmission sleeve 3, thereby limiting the inner ring of the slewing bearing 2 between the limiting ring 301 and the limiting nut 12 of the corresponding transmission sleeve 3, thereby realizing the installation of the inner ring of the slewing bearing 2 and the transmission sleeve 3.

[0027] The above-mentioned large long hole loading boring bar mechanism is a special boring mechanism specially used for machining high-precision extra-large and extra-long shell holes:

[0028] The coordinated design of the two support seats 1, the slewing bearing 2, the transmission sleeve 3 and other components with the boring bar 4 can form a good limit support for both ends of the boring bar 4, so that when the boring bar 4 rotates at high speed and slides in the axial feed, the boring bar 4 will not vibrate radially, which can avoid the vibration tendency during fine machining and the chattering of the tool, thereby avoiding affecting the roundness of the machined hole. In addition, the use of a double-row tapered roller bearing as the specific slewing bearing 2 can enable the boring bar 4 to maintain a high rotation accuracy. The roundness of the machined hole of ￠2000 can be achieved within 0.05 when fine boring an extra-large hole.

[0029] Through the loading components such as the loading rod 5, collar 6, loading bearing 10, loading handle 7 and driving cylinder 8 installed at the tail end of the boring bar 4, during fine machining, the hydraulic loading of the driving cylinder 8 can be used at any time to adjust the deflection value of the middle part of the boring bar 4 to be kept within 0.03mm, so as to avoid the boring bar 4 sagging due to excessive overhang, and ultimately ensure the straightness of the center of the machined hole, so that the middle and both ends of the machined hole have excellent coaxiality.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Based on the present invention and the above description, relevant personnel can make various changes and modifications without departing from the technical idea of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A long hole loading boring bar mechanism, characterized by: It comprises a support seat (1), a slewing bearing (2), a transmission sleeve (3), a boring bar (4), a sliding key (11), a loading rod (5), a collar (6), a loading bearing (10), a loading handle (7) and a driving cylinder (8); Two supporting seats (1) are arranged opposite to each other, a slewing bearing (2) is installed on the supporting seat (1), the outer ring of the slewing bearing (2) is fixedly connected to the corresponding supporting seat (1), and a transmission sleeve (3) is installed on the inner ring of the slewing bearing (2); the boring bar (4) passes through the transmission sleeves (3) of the two supporting seats (1) at the same time, a sliding key (11) is fixedly connected to the inner side surface of the transmission sleeve (3), an axial long key groove (401) is opened on the outer wall of the boring bar (4) at the corresponding position of the sliding key (11), and the sliding key (11) of the transmission sleeve (3) is located in the long key groove (401) corresponding to the boring bar (4); One end of the loading rod (5) is connected to a collar (6), a loading bearing (10) is installed in the collar (6), the tail end of the boring bar (4) is fixedly connected to a loading handle (7), the loading handle (7) is arranged through the loading bearing (10) of the collar (6), the outer ring of the loading bearing (10) is fixedly connected to the collar (6), and the inner ring of the loading bearing (10) is slidably fitted with the loading handle (7); The other end of the loading rod (5) is connected to the telescopic rod of the driving cylinder (8); A boring tool is mounted on the boring bar (4) via a boring tool seat (9).

2. A large long hole loading boring bar mechanism according to claim 1, characterized in that: A limiting ring (301) is integrally connected to the outer surface of one end of the transmission sleeve (3), and a thread is provided on the outer surface of the other end of the transmission sleeve (3). After the inner ring of the corresponding slewing bearing (2) is sleeved on the outer surface of the corresponding transmission sleeve (3), the limiting nut (12) is tightened on the thread of the transmission sleeve (3).

3. A large long hole loading boring bar mechanism according to claim 1 or 2, characterized in that: The slewing bearing (2) is a double-row tapered roller bearing.

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