Efficient double-spindle boring and milling machine

Abstract

The invention discloses an efficient double-spindle boring and milling machine, which relates to the technical field of boring and milling machine tools, and comprises a spindle machine tool, mounting frames which are symmetrically mounted on the spindle machine tool and have a lifting function, driving components and water tanks which are arranged in the mounting frames, and external spraying components which are mounted on the outer walls of the mounting frames and are communicated with the water tanks, the heat dissipation main shaft is rotationally arranged on the outer wall of the mounting frame and can be opened and closed in a self-adaptive and staggered mode based on heat of the friction surface, the tool bit is arranged in the heat dissipation main shaft and drains water from inside to outside to cool the friction surface, and a water injection cavity for cooling water to enter is formed in the tool bit. According to the invention, heat dissipation of the internal friction surfaces of the main shaft and the tool bit is realized, the phenomenon of tool bit deformation caused by thermal wear of the main shaft under long-term operation is reduced, and the problem that the tool bit is damaged due to relatively large friction between the interiors of the main shaft is solved. And an existing external spraying mode obviously cannot achieve an effective heat dissipation effect on the part where telescopic friction is generated.

Description

Technical Field

[0001] The invention relates to the technical field of boring and milling machine tools, in particular to a high-efficiency dual-spindle boring and milling machine. Background Art

[0002] The efficient dual-spindle boring and milling machine is a mechanical processing equipment that integrates advanced mechanical, electrical, hydraulic and other technologies. Its notable feature is that it is equipped with two spindles and can perform boring and milling operations simultaneously, thereby greatly improving processing efficiency.

[0003] For example, an opposing double-spindle horizontal machining center with publication number CN117140081A can solve the defect that the double-sided boring and milling processing equipment in the prior art cannot process large-volume or special-shaped workpieces, and can achieve the same or even higher processing accuracy, symmetry and concentricity as the double-sided boring and milling processing scheme in the prior art. At the same time, with the column-type double-sided boring and milling machine as the center, the processing cabin and peripheral equipment are compactly and reasonably designed to minimize the volume and floor space of the entire machining center. However, there is a huge defect that the high-speed rotation heat of the spindle motor in the spindle box and the high-speed rotation heat of the spindle and the heat of the tool cutting during processing affect the accuracy.

[0004] In order to expand the functions of existing machine tools, various accessory milling heads need to be installed. The corresponding milling head gripping and its hydraulic oil circuit need to be integrated on the spindle box, which makes the spindle box structure complex, the processing is cumbersome, and it is not easy to ensure the accuracy, especially the spindle motor mounting hole and the spindle mounting hole at both ends of the spindle box have poor coaxiality, which increases the spindle load and aggravates the heating problem; the existing heat dissipation solution is generally cooling through cooling water circulation, but if the cooling water circuit circulation is too long, the cooling water temperature will rise, and the cooling effect on the rear parts of the water circuit is poor; in addition, the controllability of the cooling work is poor, and cooling needs to be carried out according to the actual situation to improve the cooling work efficiency. It is worth noting that the spindle assembly, as the core component of the boring and milling machine, will produce significant temperature rise and thermal deformation during high-speed operation, which poses a direct threat to the accuracy of the machine tool. In extreme cases, it may even cause damage to the machine tool.

[0005] Moreover, the existing water cooling method only realizes the heat dissipation and cooling of the spindle by external water flushing. However, in fact, the spindle rotating at high speed will quickly throw away the cooling water sprayed on the spindle, resulting in poor water cooling effect. At the same time, since the spindle needs to be telescopically adjusted according to the boring and milling stroke of the workpiece during the boring and milling process, there is also a large friction between the inside of the spindle. The existing external spraying method obviously cannot effectively dissipate the heat of the parts that produce telescopic friction. Therefore, the thermal wear of the spindle is serious under long-term operation. In severe cases, it may even affect the concentricity of the dual spindles, thereby affecting the operation accuracy and aggravating the machine tool jitter during the boring and milling process.

[0006] In view of the above problems, it is urgent to carry out innovative design based on the original dual-spindle boring and milling machine. Summary of the invention

[0007] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. Specifically, the purpose of the present invention is to provide an efficient dual-spindle boring and milling machine to solve the problem raised in the above background technology that the high-speed rotation heat of the spindle motor in the spindle box, the high-speed rotation heat of the spindle, and the heat of tool cutting during processing have a huge impact on the accuracy.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an efficient dual-spindle boring and milling machine, comprising a spindle machine tool, a mounting frame symmetrically installed on the spindle machine tool and having a lifting function, a driving assembly and a water tank arranged in the mounting frame, and an external spray assembly installed on the outer wall of the mounting frame and connected to the water tank, and also comprising a heat dissipation spindle rotatably arranged on the outer wall of the mounting frame and adaptively staggered and opened and closed based on the heat of the friction surface, and a cutter head arranged in the heat dissipation spindle and draining water from the inside to the outside to cool the friction surface, and a water injection cavity is opened inside the cutter head for cooling water to enter.

[0009] Preferably, the heat dissipation main shaft is specifically composed of protective sheets distributed in a circular array, and each protective sheet is staggered, and one side of the protective sheet is fixedly connected to a limiting slide bar for the protective sheet to adaptively stagger and open and close.

[0010] Preferably, a heating chamber is provided in one end of the protective plate, and a piston is slidably provided in the heating chamber, one end of the piston is fixedly connected to a push rod, a fixing groove is provided in the other end of the protective plate, the end of the push rod is fixedly connected to a push block, and the push block is fixedly provided in the fixing groove.

[0011] Preferably, a spring for elastically returning the push rod is arranged in the heated chamber, and the heated chamber stores expansion gas that expands and squeezes the piston due to heat.

[0012] Preferably, the outer wall of the cutter head and the inner wall of the heat dissipation main shaft are provided with threaded through grooves which fit each other and allow cooling water to flow through the heat dissipation friction surfaces.

[0013] Preferably, a movable cavity is provided inside the cutter head for cooling water to be discharged into the threaded through groove, and the movable cavity is communicated with the water injection cavity.

[0014] Preferably, the outer wall of the cutter head is provided with a water outlet connected to the movable cavity, and a sphere is arranged in the movable cavity for adaptively controlling and blocking based on the centrifugal force of the cutter head rotation.

[0015] Preferably, the driving assembly includes a motor, a liquid inlet end drivingly connected to the output end of the motor, a telescopic sleeve rod with a telescopic adjustment function arranged on one side of the liquid inlet end, and a three-jaw chuck connected to the end of the telescopic sleeve rod, and the three-jaw chuck is clamped and connected to one end of the cutter head.

[0016] Preferably, a rotating shaft is rotatably arranged at the center of the liquid inlet end, a water inlet is opened at the top of the rotating shaft, and the water inlet is connected to the water tank through a water pipe.

[0017] Preferably, the external spray assembly includes a spray head which is arranged on the outer wall of the mounting frame and is connected to the water tank, and the spray head is placed directly above the heat dissipation main shaft.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. When the heat dissipation spindle and the cutter head are boring and milling, the cutter head needs to perform telescopic boring and milling. When the telescopic boring and milling cutter head needs to discharge the heat from the friction surface with the heat dissipation spindle, the heat generated by the heating heats the heat receiving cavity in the protective plate, causing the gas in the heat receiving cavity to expand due to the heat, and the expanded gas pushes the piston to move to one side of the heat receiving cavity, while squeezing the spring, and causing the push rod to push the push block to open and close the protective plates and form a heat dissipation gap. Since the multiple protective plates are staggered, the heat dissipation gap after opening and closing can discharge the cooling water placed in the threaded through groove. When the cooling water is discharged, it cooperates with the external spraying of the spray head, thereby improving the heat dissipation efficiency of the friction surface and outer wall of the heat dissipation spindle and the cutter head, and reducing the deformation of the cutter head due to thermal wear of the spindle under long-term operation. 2. High-speed rotation will cause significant temperature rise and thermal deformation of the cutter head and the heat dissipation spindle. At this time, the external spray assembly is started, and its spray head sprays and cools the outer wall of the heat dissipation spindle and the cutter head. While spraying externally, the liquid inlet end is connected to the water tank through the water inlet on the top of the rotating shaft, and the rotating shaft is set so that the liquid inlet end does not drive the rotating shaft to rotate while being driven, thereby avoiding the situation where the rotating shaft drives the water pipe to rotate. Then the cooling water in the water tank enters the water injection cavity opened in the cutter head through the liquid inlet end, the telescopic sleeve and the cavity of the three-jaw chuck. At this time, The cutter head is in a state of continuous rotation, which will generate rotational centrifugal force, and the sphere placed in the movable cavity will be thrown to one side of the movable cavity by the rotational centrifugal force, thereby unblocking the passage between the movable cavity and the water injection cavity, and allowing the water placed in the water injection cavity to enter the movable cavity, and then be discharged from the movable cavity into the threaded groove through the water outlet, thereby water-cooling the friction surface between the heat dissipation spindle and the cutter head, solving the problem that there is also great friction between the inside of the spindle, and the existing external spraying method is obviously unable to effectively dissipate heat for the parts where elastic friction is generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the dual-spindle boring and milling machine of the present invention.

[0020] Figure 2 It is a schematic diagram of the connection state of the boring and milling cutter head assembly and the driving assembly of the present invention.

[0021] Figure 3 It is a schematic diagram of the fixing state of the boring and milling cutter head assembly and the three-jaw chuck of the present invention.

[0022] Figure 4 It is a schematic diagram of the state where the cutter head and the heat dissipation spindle are separated from each other.

[0023] Figure 5 It is a three-dimensional internal cross-sectional view of the boring and milling cutter head assembly of the present invention.

[0024] Figure 6 This is an internal cross-sectional view of the cutter head structure of the present invention.

[0025] Figure 7 for Figure 3 A magnified view of the structure at A.

[0026] Figure 8 for Figure 5 Enlarged view of the structure at B.

[0027] In the figure: 1. spindle machine tool; 2. mounting frame; 3. external spray assembly; 4. heat dissipation spindle; 5. cutter head; 501. water outlet; 502. movable cavity; 6. liquid inlet end; 7. telescopic sleeve; 8. three-jaw chuck; 9. threaded through groove; 10. limit slide; 11. sphere; 12. heating chamber; 13. piston; 14. push rod; 15. push block; 16. spring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figures 1 to 8The present invention provides a technical solution: an efficient dual-spindle boring and milling machine, comprising a spindle machine tool 1, a mounting frame 2 symmetrically mounted on the spindle machine tool 1 and having a lifting function, a driving component and a water tank arranged in the mounting frame 2, and an external spraying component 3 installed on the outer wall of the mounting frame 2 and connected to the water tank, and also comprising a heat dissipation spindle 4 rotatably arranged on the outer wall of the mounting frame 2 and adaptively staggered and opened and closed based on the heat of the friction surface, and a cutter head 5 arranged in the heat dissipation spindle 4 and draining water from the inside to the outside to cool the friction surface, and a water injection cavity for cooling water to enter is opened inside the cutter head 5.

[0030] Specifically, the mounting frame 2 is symmetrically mounted on the spindle machine tool 1, and the interior thereof is used to place a driving assembly and a water tank, and the driving assembly is used to drive the heat dissipation spindle 4 and the cutter head 5 to rotate, and the driving assembly is connected to the water tank, and the driving assembly and the cutter head 5 are connected and clamped, and a water flow cavity is formed between the center thereof and the cutter head 5, and the water flow cavity is used to transport the cooling water entering the driving assembly from the water tank to the water injection cavity inside the cutter head 5, and the cooling water can enter the friction surface between the heat dissipation spindle 4 and the cutter head 5 through the water injection cavity, and the heat dissipation spindle 4 is in When the heat of the friction surface is too high, an offset opening and closing state will be generated. The heat dissipation spindle 4 in the open and closed state can discharge the cooling water placed in the friction surface out of the heat dissipation spindle 4, and the external spray assembly 3 installed on the outer wall of the mounting frame 2 is connected to the water tank so that the outer wall of the rotating heat dissipation spindle 4 and the cutter head 5 can be externally sprayed for cooling. When the cooling water is discharged, it cooperates with the external spraying of the spray head, thereby improving the heat dissipation efficiency of the friction surface and outer wall of the heat dissipation spindle 4 and the cutter head 5, and reducing the deformation of the cutter head 5 caused by thermal wear of the spindle under long-term operation.

[0031] The heat dissipation main shaft 4 is specifically composed of protective sheets distributed in a circular array, and each protective sheet is staggered. A limiting slide bar 10 is fixedly connected to one side of the protective sheet for adaptively dislocating and opening the protective sheet.

[0032] Specifically, the protective plates are distributed in a circular array, and each protective plate is distributed in a staggered manner. Through the setting of the limiting slide bar 10, it can produce a staggered opening and closing heat dissipation spacing, so as to facilitate the discharge of cooling water in the friction surface. The generation of this spacing can perform secondary heat dissipation on the friction surface, thereby improving the heat dissipation efficiency.

[0033] A heating chamber 12 is arranged in one end of the protective plate, and a piston 13 is slidably arranged in the heating chamber 12, one end of the piston 13 is fixedly connected to a push rod 14, a fixing groove is opened in the other end of the protective plate, the end of the push rod 14 is fixedly connected to a push block 15, and the push block 15 is fixedly arranged in the fixing groove.

[0034] A spring 16 for elastically returning the push rod 14 is arranged in the heating chamber 12 , and the heating chamber 12 stores expansion gas that expands and squeezes the piston 13 due to heat.

[0035] The outer wall of the cutter head 5 and the inner wall of the heat dissipation main shaft 4 are provided with threaded through grooves 9 which fit each other and allow cooling water to flow through the heat dissipation friction surfaces.

[0036] Specifically, when the telescopic boring and milling cutter head 5 needs to discharge the heat from the friction surface with the heat dissipation spindle 4, the increased heat heats the heat receiving chamber 12 in the protective plate, causing the gas in the heat receiving chamber 12 to expand due to the heat, and the expanded gas pushes the piston 13 to move to one side of the heat receiving chamber 12, squeezing the spring 16 while moving, and causing the push rod 14 to push the push block 15 to open and close the protective plates and form a heat dissipation gap. Moreover, since the plurality of protective plates are staggered, the heat dissipation gap after opening and closing can discharge the cooling water placed in the threaded through groove 9. When the cooling water is discharged, it cooperates with the external spraying of the spray head, thereby improving the heat dissipation efficiency of the friction surface between the heat dissipation spindle 4 and the cutter head 5.

[0037] A movable cavity 502 is provided inside the cutter head 5 for cooling water to be discharged into the threaded through groove 9 , and the movable cavity 502 is communicated with the water injection cavity.

[0038] The outer wall of the cutter head 5 is provided with a water outlet 501 which is connected with the movable cavity 502 . The movable cavity 502 is provided with a sphere 11 which performs adaptive control and blocking based on the centrifugal force of the rotation of the cutter head 5 .

[0039] Specifically, when the cooling water passes through the water injection cavity opened inside the cutter head 5, the cutter head 5 is in a continuous rotation state, which will generate a rotational centrifugal force, and the sphere 11 placed in the movable cavity 502 will be thrown to one side of the movable cavity 502 by the rotational centrifugal force, thereby unblocking the passage between the movable cavity 502 and the water injection cavity, and allowing the water placed in the water injection cavity to enter the movable cavity 502, and then be discharged from the movable cavity 502 into the threaded groove 9 through the water outlet 501, thereby water-cooling the friction surface between the heat dissipation spindle 4 and the cutter head 5.

[0040] The driving assembly includes a motor, a liquid inlet end 6 drivingly connected to the output end of the motor, a telescopic sleeve rod 7 with a telescopic adjustment function arranged on one side of the liquid inlet end 6, and a three-jaw chuck 8 connected to the end of the telescopic sleeve rod 7, and the three-jaw chuck 8 is clamped and connected to one end of the cutter head 5.

[0041] A rotating shaft is rotatably arranged at the center of the liquid inlet end 6, a water inlet is opened at the top of the rotating shaft, and the water inlet is connected to the water tank through a water pipe.

[0042] Specifically, the liquid inlet end 6 is connected to the water tank through the water inlet on the top of the rotating shaft, and through the setting of the rotating shaft, the liquid inlet end 6 will not drive the rotating shaft to rotate when being driven, thereby avoiding the situation where the rotating shaft drives the water pipe to rotate. Then, the cooling water in the water tank enters the liquid inlet end 6, the telescopic sleeve 7 and the cavity of the three-jaw chuck 8 through the rotating shaft and enters the water injection cavity opened inside the cutter head 5. At this time, because the cutter head 5 is in a continuous rotation state, it will generate a rotational centrifugal force, and the sphere 11 placed in the movable cavity 502 will be thrown to one side of the movable cavity 502 by the rotational centrifugal force, thereby unblocking the channel between the movable cavity 502 and the water injection cavity, and allowing the water placed in the water injection cavity to enter the movable cavity 502, and then be discharged from the movable cavity 502 through the water outlet 501 into the threaded groove 9, thereby water-cooling the friction surface between the heat dissipation spindle 4 and the cutter head 5.

[0043] The external spray assembly 3 includes a spray head which is arranged on the outer wall of the mounting frame 2 and is connected to the water tank, and the spray head is placed directly above the heat dissipation main shaft 4 .

[0044] Working principle: when the cutter head 5 is inserted into the heat dissipation spindle 4, the clamping claws on the three-jaw chuck 8 clamp one end of the cutter head 5. At the same time, the motor is started, and the motor drives the liquid inlet end 6 to rotate, so that the liquid inlet end 6 drives the three-jaw chuck 8 to rotate through the telescopic sleeve 7, so that the three-jaw chuck 8 drives the cutter head 5 and the heat dissipation spindle 4 to rotate, so as to perform boring and milling of the workpiece. When the cutter head 5 and the heat dissipation spindle 4 are boring and milling the workpiece, the high-speed rotation operation will cause the cutter head 5 and the heat dissipation spindle 4 to produce significant temperature rise and thermal deformation. At this time, the external spray assembly 3 is started, and its spray head sprays and cools the outer walls of the heat dissipation spindle 4 and the cutter head 5. While spraying externally, the liquid inlet end 6 is connected to the water tank through the water inlet on the top of the rotating shaft, and the liquid inlet end 6 is set at While being driven, it does not drive the rotating shaft to rotate, thereby avoiding the situation where the rotating shaft drives the water pipe to rotate. Then, the cooling water in the water tank enters the water injection cavity opened inside the cutter head 5 through the liquid inlet end 6, the telescopic sleeve 7 and the cavity of the three-jaw chuck 8. At this time, because the cutter head 5 is in a state of continuous rotation, it will generate a rotating centrifugal force, and the ball 11 placed in the movable cavity 502 will be thrown to one side of the movable cavity 502 by the rotating centrifugal force, thereby unblocking the passage between the movable cavity 502 and the water injection cavity, and allowing the water placed in the water injection cavity to enter the movable cavity 502, and then be discharged from the movable cavity 502 into the threaded through groove 9 through the water outlet 501, thereby water-cooling the friction surface between the heat dissipation spindle 4 and the cutter head 5; When the heat dissipation spindle 4 and the cutter head 5 are boring and milling, the cutter head 5 needs to perform telescopic boring and milling, and when the telescopic boring and milling cutter head 5 needs to discharge the heat from the friction surface with the heat dissipation spindle 4, the increased heat heats the heat receiving chamber 12 in the protective plate, causing the gas in the heat receiving chamber 12 to expand due to the heat, and the expanded gas pushes the piston 13 to move to one side of the heat receiving chamber 12, squeezing the spring 16 while moving, and causing the push rod 14 to push the push block 15 to open and close the protective plates and form a heat dissipation gap. Moreover, since the plurality of protective plates are staggered, the heat dissipation gap after opening and closing can discharge the cooling water placed in the threaded through groove 9. When the cooling water is discharged, it cooperates with the external spraying of the spray head, thereby improving the heat dissipation efficiency of the friction surface between the heat dissipation spindle 4 and the cutter head 5 and reducing the thermal wear of the spindle under long-term operation.

[0045] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An efficient dual-spindle boring and milling machine, comprising a spindle machine tool (1), a mounting frame (2) symmetrically mounted on the spindle machine tool (1) and having a lifting function, a drive assembly and a water tank arranged in the mounting frame (2), and an external spray assembly (3) mounted on the outer wall of the mounting frame (2) and connected to the water tank, characterized in that: It also includes a heat dissipation main shaft (4) rotatably arranged on the outer wall of the mounting frame (2) and adaptively staggered and opened and closed based on the heat of the friction surface, and a cutter head (5) arranged in the heat dissipation main shaft (4) and cooling the friction surface from the inside to the outside, and a water injection cavity for cooling water to enter is provided inside the cutter head (5).

2. The efficient dual-spindle boring and milling machine according to claim 1, characterized in that: The heat dissipation main shaft (4) is specifically composed of protective sheets distributed in a circular array, and each protective sheet is arranged in a staggered manner. One side of the protective sheet is fixedly connected to a limiting slide bar (10) for the protective sheet to adaptively stagger and open and close.

3. The high-efficiency dual-spindle boring and milling machine according to claim 2, characterized in that: A heat receiving chamber (12) is arranged in one end of the protection sheet, and a piston (13) is slidably arranged in the heat receiving chamber (12), one end of the piston (13) is fixedly connected to a push rod (14), and a fixing groove is arranged in the other end of the protection sheet, and a push block (15) is fixedly connected to the end of the push rod (14), and the push block (15) is fixedly arranged in the fixing groove.

4. The high-efficiency dual-spindle boring and milling machine according to claim 3, characterized in that: A spring (16) for elastically returning the push rod (14) is arranged in the heat receiving chamber (12), and the heat receiving chamber (12) stores expansion gas that expands and squeezes the piston (13) when heated.

5. The efficient dual-spindle boring and milling machine according to claim 1, characterized in that: The outer wall of the cutter head (5) and the inner wall of the heat dissipation main shaft (4) are provided with threaded through grooves (9) which fit together and allow cooling water to flow through the heat dissipation friction surfaces.

6. The high-efficiency dual-spindle boring and milling machine according to claim 5, characterized in that: The cutter head (5) is provided with a movable cavity (502) for cooling water to be discharged into the threaded through groove (9), and the movable cavity (502) is connected to the water injection cavity.

7. The high-efficiency dual-spindle boring and milling machine according to claim 6, characterized in that: The outer wall of the cutter head (5) is provided with a water outlet (501) which is in communication with the movable cavity (502), and a sphere (11) which performs adaptive control and blocking based on the rotating centrifugal force of the cutter head (5) is arranged in the movable cavity (502).

8. The high-efficiency dual-spindle boring and milling machine according to claim 1, characterized in that: The driving assembly comprises a motor, a liquid inlet end (6) drivingly connected to an output end of the motor, a telescopic sleeve rod (7) having a telescopic adjustment function and arranged on one side of the liquid inlet end (6), and a three-jaw chuck (8) connected to an end of the telescopic sleeve rod (7), wherein the three-jaw chuck (8) is clamped and connected to one end of the cutter head (5).

9. The high-efficiency dual-spindle boring and milling machine according to claim 8, characterized in that: A rotating shaft is rotatably arranged at the center of the liquid inlet end (6), a water inlet is provided at the top of the rotating shaft, and the water inlet is connected to the water tank through a water pipe.

10. The high-efficiency dual-spindle boring and milling machine according to claim 1, characterized in that: The external spray assembly (3) comprises a spray head which is arranged on the outer wall of the mounting frame (2) and is connected to the water tank, and the spray head is placed directly above the heat dissipation main shaft (4).

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