High-rigidity boring bar structure

Abstract

The utility model discloses a high rigidity boring bar structure which comprises a supporting flange, a boring bar sleeve and a boring bar body which are sequentially sleeved from outside to inside, the front end of the boring bar body is connected with a cutter handle, and the boring bar sleeve and the boring bar body can do linear feeding motion in the supporting flange in the axial direction. Linear bearings are arranged on the outer side of the boring rod sleeve and at the front end and the rear end of the inner side of the supporting flange; bearings are arranged on the inner side of the boring rod sleeve and at the front end and the rear end of the outer ring of the boring rod body, and the boring rod body can rotate in the boring rod sleeve in the circumferential direction to conduct cutting machining on a workpiece. According to the high-rigidity boring rod structure, through the linear bearings arranged at the front end and the rear end of the boring rod sleeve in the supporting flange, the supporting rigidity can be provided when the boring rod sleeve and the boring rod body move and machine, the movement stability is guaranteed, and meanwhile the arranged bearings are matched to have the rigid supporting effect on the boring rod body; therefore, the motion stability of the boring bar structure, the front-end cutter handle and the cutter is guaranteed, and high-precision machining is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of machine tool processing, in particular to a high-rigidity boring bar structure. Background Art

[0002] The boring bar is one of the main components of machine tools such as boring machines and deep-hole drilling and boring machines. It is usually installed on the main shaft of the machine tool. Through its connection with the main shaft, it realizes rotation and axial movement, so as to complete the processing of workpieces.

[0003] However, the current boring bar structure has problems of poor structural rigidity and poor stability during processing, often resulting in a significant decrease in processing accuracy and unable to meet the actual processing requirements. Summary of the Utility Model

[0004] The utility model provides a high-rigidity boring bar structure to solve the problem of low processing accuracy caused by poor rigidity and poor stability of the boring bar structure during processing.

[0005] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A high-rigidity boring bar structure includes a support flange, a boring bar sleeve and a boring bar body sleeved from outside to inside in sequence. A tool holder is connected to the front end of the boring bar body. The boring bar sleeve and the boring bar body can perform linear feed movement in the axial direction within the support flange. Linear bearings are provided at the front end and the rear end on the outer side of the boring bar sleeve and the inner side of the support flange.

[0007] Bearings are provided at the front end and the rear end on the inner side of the boring bar sleeve and the outer circumference of the boring bar body. The boring bar body can rotate circumferentially within the boring bar sleeve to perform cutting processing on the workpiece.

[0008] Further, the boring bar body includes a mandrel and a broaching structure arranged inside the mandrel. The front end of the broaching structure is connected to the tool holder; the bearings are arranged on the outer circumference of the mandrel.

[0009] Further, a hydraulic clamping sleeve for axially clamping the boring bar sleeve is provided on the outer side of the boring bar sleeve and the inner side of the support flange;

[0010] A hydraulic gap is provided between the inner circle of the hydraulic clamping sleeve and the boring bar sleeve, and a hydraulic space is provided between the outer circle of the hydraulic clamping sleeve and the support flange. The hydraulic space is communicated with a hydraulic channel arranged inside the support flange.

[0011] Further, sealing plates are provided on the front end face and the rear end face of the support flange, and sealing rings are provided on the inner circles of the sealing plates.

[0012] Further, locking nuts for axially locking the bearings are provided at both the front end and the rear end of the outer side of the boring bar sleeve.

[0013] Further, bearing outer gland covers are provided at both the front end and the rear end of the boring bar sleeve and on the outer side of the bearings.

[0014] Further, an annular spray structure is provided at one end of the boring bar sleeve close to the tool shank, and an air seal ring is provided on the bearing outer gland cover.

[0015] Further, a bearing temperature sensor is further included, and the bearing temperature sensor is installed at the front end and the rear end of the boring bar sleeve and at the positions corresponding to the installation positions of the bearings.

[0016] The beneficial effects of the present utility model are as follows:

[0017] A high-rigidity boring bar structure disclosed by the present utility model can provide the support rigidity during the movement and machining of the boring bar sleeve and the boring bar body through the linear bearings provided at the front end and the rear end of the boring bar sleeve in the support flange, ensure the movement stability, and at the same time cooperate with the set bearings to provide a rigid support for the boring bar body, thereby ensuring the movement stability of the boring bar structure, the front-end tool shank and the tool, and further realizing high-precision machining. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a front view cross-sectional view of a high-rigidity boring bar structure disclosed in the embodiments of the present utility model;

[0020] Figure 2 For Figure 1 the enlarged view of part A in

[0021] In the figure: 1, support flange; 2, boring bar sleeve; 3, boring bar body; 31, mandrel; 32, broaching structure; 4, tool shank; 5, linear bearing; 6, bearing; 7, hydraulic clamping sleeve; 8, hydraulic space; 9, hydraulic channel; 10, pressure inlet; 11, sealing plate; 12, sealing ring; 13, locking nut; 14, bearing outer gland cover; 15, annular spray structure; 16, air seal ring; 17, bearing temperature sensor; 18, bearing spacer; 19, annular spray protection ring; 20, bearing outer ring spacer. Detailed Embodiments

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] As Figure 1-2 shown, a high-rigidity boring bar structure provided by this embodiment includes a support flange 1, a boring bar sleeve 2, and a boring bar body 3 sleeved from outside to inside in sequence. A tool holder 4 is connected to the front end of the boring bar body 3. The boring bar sleeve 2 and the boring bar body 3 can perform linear feed movement along the axial direction within the support flange 1. Linear bearings 5 are provided at the front end and the rear end on the outer side of the boring bar sleeve 2 and the inner side of the support flange 1.

[0024] Bearings 6 are provided at the front end and the rear end on the inner side of the boring bar sleeve 2 and the outer circumference of the boring bar body. The boring bar body can rotate circumferentially within the boring bar sleeve 2 to perform cutting processing on the workpiece. The bearings 6 are used to support the boring bar body when the boring bar body rotates within the boring bar sleeve 2 to perform cutting on the workpiece, so as to improve the support rigidity of the boring bar body, and further improve the machining position accuracy and stability of the tool holder 4 and the tool, and improve the machining accuracy of this boring bar structure. The linear bearings adopted can achieve high-precision positioning and stable movement due to their precise manufacturing process and precise arrangement of rolling elements, and have the advantages of high precision and high rigidity. The linear bearing is composed of hundreds of small steel balls and a copper sleeve, and has a large support area and good rigidity. The diameter deviation of the steel ball size is <0.001 mm, and the standard of the adopted steel ball is ISO3290, G10 grade, with high movement precision. Moreover, the linear bearing also has the characteristics of high load-bearing capacity, good stability, and low friction resistance, and can meet the high-rigidity and high-precision machining requirements of this boring bar structure.

[0025] A high-rigidity boring bar structure disclosed by the present utility model can provide the support rigidity for the movement and machining of the boring bar sleeve and the boring bar body by the linear bearings provided at the front end and the rear end of the boring bar sleeve within the support flange, ensure the movement stability, and at the same time cooperate with the bearings provided to rigidly support the boring bar body, so as to ensure the movement accuracy and machining accuracy of the front-end tool holder and the tool.

[0026] In a specific embodiment, the boring bar body 3 includes a mandrel 31 and a broaching structure 32 disposed within the mandrel. The front end of the broaching structure is connected to the tool holder 4; the bearing 6 is disposed on the outer circumference of the mandrel 31; the provided broaching structure can realize the automatic tool changing operation of the boring bar, avoid manual tool changing operation, reduce the tool changing time, improve the production efficiency, and also avoid the errors that may occur during the manual tool changing process, further ensuring high-precision machining; at the same time, by replacing different tool combinations, the machine tool can adapt to different machining requirements, improving the flexibility and adaptability of the machine tool; the bearing plays a supporting role for the mandrel, improving the supporting rigidity of the mandrel and the broaching structure inside the mandrel, and further improving the machining position accuracy of the tool holder 4 and the front-end tool.

[0027] In a specific embodiment, a hydraulic clamping sleeve 7 for axially clamping the boring bar sleeve 2 is provided on the outer side of the boring bar sleeve 2 and inside the support flange 1;

[0028] A hydraulic clamping sleeve 7 for axially clamping the boring bar sleeve 2 is provided on the outer side of the boring bar sleeve 2 and inside the support flange 1;

[0029] A hydraulic gap is provided between the inner circumference of the hydraulic clamping sleeve 7 and the boring bar sleeve 2, and a hydraulic space 8 is provided between the outer circumference of the hydraulic clamping sleeve 7 and the support flange 1. The hydraulic space 8 is communicated with a hydraulic channel 9 provided inside the support flange 1; the provided hydraulic clamping sleeve 7 can radially clamp the boring bar sleeve 2 when the boring bar body 3 in the boring bar sleeve 2 drives the tool holder 4 to rotate circumferentially to machine the workpiece, so as to prevent the boring bar sleeve 2 from rotating; specifically, a pressure inlet 10 communicated with the hydraulic channel 9 is provided on the support flange 1. By introducing oil pressure through the pressure inlet 10, the hydraulic clamping sleeve is deformed under pressure, eliminating the hydraulic gap between the inner circumference of the hydraulic clamping sleeve and the boring bar sleeve 2, making the inner wall surface of the hydraulic clamping sleeve contact the outer wall surface of the boring bar sleeve 2. The hydraulic clamping sleeve generates a certain radial clamping force on the boring bar sleeve 2, generating a large locking torque, realizing the interference fit between the boring bar sleeve 2 and the hydraulic clamping sleeve 7. Therefore, the two linear bearings 5 and the hydraulic clamping sleeve 7 provided form a long rigid support body. When the boring bar body 3 extends a long distance out of the boring bar sleeve 2 for machining, it can also ensure that the boring bar body has strong cutting rigidity and high machining part accuracy; moreover, the hydraulic clamping sleeve is set to cooperate with the oil pressure method of a copper sleeve to clamp the boring bar sleeve 2, having a certain anti-damping effect and being able to achieve a shock absorption effect.

[0030] In a specific embodiment, sealing plates 11 are provided on both the front end face and the rear end face of the support flange 1. A sealing ring 12 is provided inside the inner circle of the sealing plate 11. The sealing plate 11 and the sealing ring 12 play a role in protecting the linear bearing 5 and preventing the linear bearing 5 from being contaminated, improving the supporting effect of the linear bearing 5, thereby ensuring the structural rigidity and position stability of the boring bar structure, and further realizing the high-precision machining of the boring bar structure.

[0031] In a specific embodiment, locking nuts 13 for axially locking the bearings 6 are provided at both the front end and the rear end of the outer side of the boring bar sleeve 2; the locking nuts 13 can ensure the stability of the bearings 6 and can also adjust the tightness of the bearings 6 to make them reach the best working state, which is beneficial to improving the machining accuracy and stability of the boring bar structure; in this embodiment, a bearing spacer sleeve 18 is further provided between the locking nut 13 and the bearing 6 provided at the front end, which plays a role in isolating and protecting the bearing 6 and adjusting the gap between the bearing 6 and the locking nut 13; a bearing outer ring spacer sleeve 20 is provided between the boring bar sleeve and the mandrel and between the front bearing 6 and the rear bearing 6.

[0032] In a specific embodiment, bearing outer gland covers 14 are provided at both the front end and the rear end of the boring bar sleeve 2 and on the outer side of the bearings 6. The bearing outer gland covers 14 are used to further fasten the bearings 6 and can bear axial forces, thereby protecting the bearings 6 from damage and ensuring the position stability of the bearings 6 during machining.

[0033] In a specific embodiment, an annular spray structure 15 is provided at one end of the boring bar sleeve 2 close to the tool holder 4. An air sealing ring 16 is provided on the bearing outer gland cover 14, that is, the annular spray structure is provided at the front end of the boring bar structure for external cooling during machining. Through the annular spray structure, the spraying direction and flow rate of the coolant or gas can be precisely controlled to meet specific requirements during the machining process;

[0034] In this embodiment, an annular spray protection ring 19 is also provided on the bearing outer gland cover 14 provided at the front end on the side close to the tool holder 4, which is used to prevent the annular spray coolant from contaminating the bearings 6 and the bearing outer gland covers 14 during cutting of the workpiece, affecting their functions; the provided air sealing ring can ensure the effective spraying and sealing effect of the gas or fluid during the annular spray cooling process, thereby ensuring the normal operation of the bearings 6 provided at the front end.

[0035] In a specific embodiment, a bearing temperature sensor 17 is further included. The bearing temperature sensor 17 is installed at the front end and the rear end of the boring bar sleeve 2 and at the positions corresponding to the installation positions of the bearings 6, and is used to monitor the temperature of the bearings 6, and further play a role in monitoring the working state of the boring bar.

[0036] The working process of a high-rigidity boring bar structure disclosed by the present utility model is as follows:

[0037] First, the boring bar sleeve 2, the boring bar body 3, and the tool holder 4 perform a linear feed motion along the axial direction under the drive of the main shaft. During the motion, the linear bearings 5 respectively arranged at the front and rear ends of the outer circle of the boring bar sleeve 2 provide support rigidity for the component structure of the inner circle of the support flange 1 of the boring bar sleeve 2 and the boring bar body 3, reducing the problem of low tool motion position accuracy caused by insufficient rigidity of the boring bar for the tool holder 4 and the tool, and being able to improve the rigidity of the boring bar structure, thereby improving the cutting accuracy;

[0038] After the linear feed motion is completed, the oil pressure enters the hydraulic clamping sleeve through the pressure inlet and the hydraulic channel 9 on the support flange 1, so that the hydraulic clamping sleeve clamps and fixes the boring bar sleeve 2. Then, the boring bar body 3, the broaching structure, the tool holder 4, and the locking nut 13 jointly rotate circumferentially in the boring bar sleeve 2 to perform cutting processing on the workpiece;

[0039] According to the actual processing requirements, the automatic tool change operation of the boring bar can be realized through the broaching structure inside the boring bar body 3, reducing the tool change time and improving the production efficiency. Moreover, it can also avoid the errors that may occur during the manual tool change process, further ensuring high-precision processing; at the same time, by replacing different tool combinations, the machine tool can adapt to different processing requirements, improving the flexibility and adaptability of the machine tool.

[0040] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high rigidity boring bar structure, characterized in that: The invention comprises a support flange (1), a boring bar sleeve (2) and a boring bar body (3) which are sequentially sleeved from the outside to the inside, the front end of the boring bar body (3) is connected to a tool handle (4), the boring bar sleeve (2) and the boring bar body (3) can perform linear feed motion along the axial direction in the support flange (1), and the front end and the rear end of the outer side of the boring bar sleeve (2) and the inner side of the support flange (1) are both provided with linear bearings (5); Bearings (6) are provided inside the boring bar sleeve (2) and at the front and rear ends of the outer ring of the boring bar body. The boring bar body can rotate circumferentially within the boring bar sleeve (2) to perform cutting processing on a workpiece.

2. A high rigidity boring bar structure according to claim 1, characterized in that: The boring bar body (3) comprises a core shaft (31) and a broach structure (32) arranged in the core shaft, wherein the front end of the broach structure is connected to the tool handle (4); and the bearing (6) is arranged on the outer ring of the core shaft (31).

3. A high rigidity boring bar structure according to claim 1, characterized in that: A hydraulic clamping sleeve (7) for clamping the boring bar sleeve (2) in the axial direction is provided on the outside of the boring bar sleeve (2) and on the inside of the supporting flange (1); A hydraulic gap is provided between the inner ring of the hydraulic clamping sleeve (7) and the boring bar sleeve (2), a hydraulic space (8) is provided between the outer ring of the hydraulic clamping sleeve (7) and the supporting flange (1), and the hydraulic space (8) is communicated with a hydraulic channel (9) provided inside the supporting flange (1).

4. A high rigidity boring bar structure according to claim 1, characterized in that: The front end face and the rear end face of the support flange (1) are both provided with sealing plates (11), and the inner ring of the sealing plate (11) is provided with a sealing ring (12).

5. A high rigidity boring bar structure according to claim 1, characterized in that: The front end and the rear end of the outer side of the boring bar sleeve (2) are both provided with locking nuts (13) for axially locking the bearing (6).

6. A high rigidity boring bar structure according to claim 1, characterized in that: The front and rear ends of the boring bar sleeve (2) and the outer side of the bearing (6) are both provided with bearing outer pressure covers (14).

7. A high rigidity boring bar structure according to claim 6, characterized in that: An annular spray structure (15) is provided on the boring bar sleeve (2) and at one end close to the tool handle (4), and an air sealing ring (16) is provided on the bearing outer pressure cover (14).

8. The high rigidity boring bar structure according to claim 1, characterized in that: It also includes a bearing temperature sensor (17), which is installed at the front end and the rear end of the boring bar sleeve (2) and corresponds to the position where the bearing (6) is installed.

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