Double-head numerical control drilling and tapping center

Abstract

The invention discloses a double-head numerical control drilling and tapping center, and relates to the technical field of numerical control drilling and tapping. The machine specifically comprises a first machine frame and a second machine frame fixed to the first machine frame and the ground at the same time, a conveying transposition assembly used for fixing and conveying workpieces is arranged on the inner side of the first machine frame, two machining head assemblies are arranged on the front side of the second machine frame, and a multi-mode driving mechanism used for driving the machining head assemblies is arranged on the front side of the second machine frame. The machining head assembly comprises a sliding seat, a main shaft seat fixed to the side wall of the sliding seat and a main shaft rotationally connected to the inner wall of the main shaft seat, a sliding rail is fixed to the side wall of the second rack, and the sliding seat is in sliding fit with the outer wall of the sliding rail through an electric sliding block. On the basis that the two machining head assemblies are arranged, the structure is designed and optimized, so that switching of multiple modes of drilling and tapping, double drilling, double tapping, single drilling and single tapping can be achieved, the basic machining function is met, and meanwhile the drilling and tapping efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of numerical control drilling and tapping, and particularly relates to a double-head numerical control drilling and tapping center. Background Art

[0002] A numerical control drilling and tapping center is a high-precision and high-efficiency numerical control machine tool, specially designed for precision machining such as small-diameter drilling and tapping, and is particularly suitable for mass production in fields such as 3C electronics, medical devices, and precision molds.

[0003] After retrieval, a patent with the Chinese patent publication number CN218253036U discloses a clamping mechanism for a numerical control drilling and tapping machine, including a fixed base. A support column is arranged at the rear side of the upper end surface of the fixed base. A fixed frame is arranged on the support column. A drilling and tapping mechanism is arranged at the front end of the fixed frame. A driving motor is arranged at the upper end of the drilling and tapping mechanism. A drill bit is arranged at the lower end of the drilling and tapping mechanism. A fixed block, a threaded rod, a slider, a slide rail, and a baffle are sequentially arranged on the upper side of the fixed base from front to back. A negative pressure pump is arranged on the fixed base, and the negative pressure pump is located in front of the support column. A blower is arranged on the negative pressure pump. The number of the slide rails is two, and the two slide rails are symmetrically arranged. The slider is slidably connected to the two slide rails. The threaded rod is rotatably connected between the fixed block and the baffle. The threaded rod is higher than the two slide rails and penetrates through the slider and is rotatably connected inside the slider. A runner is arranged on the front side of the fixed block. The front end of the threaded rod penetrates through the fixed block and is fixedly connected to the runner.

[0004] The above patent has the following deficiencies: It adopts single-head processing, and the processing mode is single. Since drilling is required before tapping, the single-mode processing leads to low processing efficiency of the entire threaded hole.

[0005] Therefore, the present invention proposes a double-head numerical control drilling and tapping center. Summary of the Invention

[0006] The purpose of the present invention is to solve the deficiencies existing in the prior art, and a double-head numerical control drilling and tapping center is proposed.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions: A double-head numerical control drilling and tapping center includes a first frame and a second frame that is simultaneously fixed to the first frame and the ground. A conveying and transposition assembly for fixing and conveying workpieces is arranged inside the first frame. Two groups of processing head assemblies are arranged on the front side of the second frame, and a multi-mode driving mechanism for driving the processing head assemblies is arranged on the front side of the second frame; The processing head assembly includes a slide, a spindle seat fixed to the side wall of the slide, and a spindle rotatably connected to the inner wall of the spindle seat. A slide rail is fixed to the side wall of the frame 2, and the slide seat is slidably matched with the outer wall of the slide rail through an electric slider. The bottom of the spindle is connected to the processing head through a tool handle transmission, and the top of the spindle is connected to a key shaft through a transmission sleeve 1. The two key shafts are transmission-matched with a multi-mode drive mechanism.

[0008] Preferably: the multi-mode drive mechanism includes an electronically controlled clutch, a continuously variable transmission and a motor fixed to frame two, the output shaft of the synchronization component is connected to the end of one of the key shafts through a coupling, and the output shaft of the motor is connected to the input shaft of the continuously variable transmission through the synchronization component, the output shaft of the continuously variable transmission is fixedly connected to the input shaft of the electronically controlled clutch, and the output shaft of the electronically controlled clutch is fixedly connected to the end of another key shaft.

[0009] Furthermore, the key shaft is movably plugged into the inner wall of the transmission sleeve 1, a key slot is provided on the inner wall of the transmission sleeve 1, and a key protrusion which matches the key slot clearance is fixed on the outer wall of the key shaft.

[0010] On the basis of the above scheme: a limiting groove is provided on the inner wall of the key protrusion, the inner walls of the two limiting grooves that cooperate with each other are matched with the same synchronization plate, and a screw hole is provided on the inner wall of the limiting groove, and a through hole is provided on the inner wall of the synchronization plate, and the inner wall of the screw hole is connected with a connecting bolt that passes through the through hole through a threaded connection.

[0011] A better solution among the above solutions is: a transmission cylinder 2 is fixed to the bottom of the main shaft, the tool handle is movably connected to the inner wall of the transmission cylinder 2 through a slide plate, and a transmission groove is opened on the inner side of the transmission cylinder 2, and a transmission protrusion matching the transmission groove is provided on the top of the slide plate.

[0012] As a further solution of the present invention: the transmission groove and the transmission protrusion are any one of "straight-shaped", "cross-shaped" and "hexagonal".

[0013] At the same time, the conveying transposition assembly includes a belt / chain transmission assembly arranged on the inner side of the frame and a plurality of support plates located on the periphery of the belt / chain transmission assembly and connected to the belt / chain outer wall of the belt / chain transmission assembly through connecting belts.

[0014] As a preferred embodiment of the present invention: the inner wall of the frame 1 is provided with a belt / chain transmission assembly parallel to the movement path of the belt / chain transmission assembly, and the side wall of the support plate is fixed with at least two groups of rollers with at least two rollers in each group, and the outer wall of the roller is rotatably connected with a roller, and the roller rolls and cooperates with the inner wall of the belt / chain transmission assembly.

[0015] At the same time, a disassembly plate is arranged on one side of the support plate, and a clamping assembly for fixing the workpiece is arranged on the outer wall of the disassembly plate.

[0016] As a more optimal solution of the present invention: stud bolts are fixed at the four corners of the outer wall of the support plate, and the outer wall of each stud bolt is sleeved with the same disassembly plate, and a clamping assembly for fixing the workpiece is arranged on the outer wall of the disassembly plate.

[0017] The beneficial effects of the present invention are as follows: 1. In the present invention, on the basis of setting two machining head assemblies, through the design and optimization of the structure, various mode switches such as drilling + tapping, double drilling, double tapping, single drilling, and single tapping can be realized. While meeting the basic machining functions, the efficiency of drilling and tapping is increased.

[0018] 2. In the present invention, by setting a continuously variable transmission, it can perform continuously variable speed processing, so that in the drilling + tapping mode, the descending speed and the rotational speed of the two key shafts can be proportionally controlled, thereby ensuring efficiency and preventing drill jamming.

[0019] 3. In the present invention, while being driven by a set of multi-mode drive mechanisms, and by using the connection method between the key shaft and the first transmission sleeve, it can ensure transmission while also being able to axially slip, so that the motor as the power source always remains in a fixed state, preventing the wires of the motor from being wound and broken.

[0020] 4. In the present invention, by arranging structures such as a transmission groove and a transmission protrusion between the main shaft and the tool holder, and using the reaction force and gravity to control the combination and separation of the transmission groove and the transmission protrusion. On the one hand, the cooperation between the transmission groove and the transmission protrusion has a certain longitudinal cooperation interval, and this interval can compensate for the errors in the actual rotational speed and lifting speed control to a certain extent, ensuring the reliability of tapping. On the other hand, when not drilling or tapping, there is only a small frictional transmission between the second transmission cylinder and the tool holder. At this time, even if the worker's clothes or gloves come into contact with the machining head, the machining head will immediately stop and will not wind them, thus increasing safety. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the overall structure of a double-head CNC drilling and tapping center proposed by the present invention; Figure 2 It is a schematic diagram of the structure of the machining head assembly and the multi-mode drive mechanism of a double-head CNC drilling and tapping center proposed by the present invention; Figure 3 It is a schematic cross-sectional view of the key shaft and the first transmission sleeve of a double-head CNC drilling and tapping center proposed by the present invention; Figure 4 It is a schematic exploded view of the connection between the synchronous plate and the sliding seat of a double-head CNC drilling and tapping center proposed by the present invention; Figure 5 It is a schematic diagram of the overall structure of the conveying and transposition assembly of a double-head CNC drilling and tapping center proposed by the present invention; Figure 6 Partial structural schematic diagram of the conveying and transposition component of a double-head CNC drilling and tapping center proposed by the present invention; Figure 7 Schematic diagram of the spindle and tool holder structure of a double-head CNC drilling and tapping center proposed by the present invention.

[0022] In the figure: 1, the first frame; 2, the conveying and transposition component; 3, the machining head component; 4, the multi-mode drive mechanism; 5, the second frame; 6, the slide rail; 7, the key shaft; 8, the electric slider; 9, the first transmission sleeve; 10, the slide seat; 11, the spindle; 12, the tool holder; 13, the machining head; 14, the spindle seat; 15, the electric control clutch; 16, the stepless speed changer; 17, the synchronization component; 18, the motor; 19, the key projection; 20, the key groove; 21, the limit groove; 22, the screw hole; 23, the through hole; 24, the synchronization plate; 25, the connecting bolt; 26, the support plate; 27, the clamping component; 28, the stud; 29, the disassembly plate; 30, the connecting belt; 31, the belt / chain drive component; 32, the roller; 33, the roller shaft; 34, the slide plate; 35, the drive groove; 36, the drive projection; 37, the second drive cylinder. Specific embodiments

[0023] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments.

[0024] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention. Embodiment

[0025] A double-head CNC drilling and tapping center, as Figures 1-7 shown, includes the first frame 1 and the second frame 5 that is fixed to both the first frame 1 and the ground. A conveying and transposition component 2 for fixing and conveying workpieces is arranged inside the first frame 1, and two groups of machining head components 3 are arranged on the front side of the second frame 5, and a multi-mode drive mechanism 4 for driving the machining head components 3 is arranged on the front side of the second frame 5.

[0026] The machining head component 3 includes a slide seat 10, a spindle seat 14 fixed to the side wall of the slide seat 10, and a spindle 11 rotatably connected to the inner wall of the spindle seat 14. A slide rail 6 is fixed to the side wall of the second frame 5, and the slide seat 10 is slidably engaged with the outer wall of the slide rail 6 through an electric slider 8. The bottom of the spindle 11 is drivingly connected to a machining head 13 through a tool holder 12, and the top of the spindle 11 is drivingly connected to a key shaft 7 through a first transmission sleeve 9. The two key shafts 7 are drivingly engaged with the multi-mode drive mechanism 4.

[0027] The multi-mode drive mechanism 4 includes an electric control clutch 15, a continuously variable transmission 16, and a motor 18 fixed to the second frame 5. The output shaft of the synchronization assembly 17 is connected to the end of one of the key shafts 7 through a coupling, and the output shaft of the motor 18 is drivingly connected to the input shaft of the continuously variable transmission 16 through the synchronization assembly 17. The output shaft of the continuously variable transmission 16 is fixedly connected to the input shaft of the electric control clutch 15, and the output shaft of the electric control clutch 15 is fixedly connected to the end of the other key shaft 7.

[0028] The key shaft 7 is movably inserted into the inner wall of the first transmission sleeve 9. A key groove 20 is formed on the inner side wall of the first transmission sleeve 9, and a key projection 19 that is in clearance fit with the key groove 20 is fixed to the outer wall of the key shaft 7.

[0029] A limiting groove 21 is formed on the inner wall of the key projection 19. The inner walls of two mutually cooperating limiting grooves 21 are fitted with the same synchronization plate 24, and a screw hole 22 is formed on the inner wall of the limiting groove 21. A through hole 23 is formed on the inner wall of the synchronization plate 24. A connecting bolt 25 that penetrates through the through hole 23 is threadedly connected to the inner wall of the screw hole 22.

[0030] When the device is in use, when the motor 18 is started, on the one hand, it drives one of the key shafts 7 to rotate, and on the other hand, it drives the other key shaft 7 to rotate through the synchronization assembly 17 - continuously variable transmission 16 - electric control clutch 15. Thereby, the main shaft 11 is driven to rotate through the first transmission sleeve 9, and the machining head 13 is driven to rotate through the tool holder 12 for drilling and tapping.

[0031] The specific drilling and tapping modes include double-head drilling and tapping and single-head drilling and tapping. Among them, the double-head drilling and tapping has three forms: double drilling, double tapping, and drilling + tapping. The single-head drilling and tapping has two forms: drilling and tapping. Their working principles are as follows: Drilling + tapping: The two machining heads 13 are respectively set as a drill bit and a tap. Then, the two groups of sliding seats 10 are connected by using the synchronization plate 24, and a group of slide rails 6 and the key shaft 7 are used. The other group follows without being powered on. At this time, the workpiece is fixed to the conveying and transposing assembly 2 and conveyed to the bottom of the drill bit by the conveying and transposing assembly 2. First, drilling is performed, and then the conveying and transposing assembly 2 continues to convey, conveying the drilled workpiece to the bottom of the tap, and at the same time, conveying the next undrilled workpiece to the bottom of the drill bit. At this time, a group of slide rails 6 cooperate with the key shaft 7 to drive the two sliding seats 10 to descend synchronously, and the drill bit and the tap simultaneously process the two workpieces. In addition, during this process, the electric control clutch 15 needs to be in the engaged state, and through the speed change control of the continuously variable transmission 16, the rotation speed and the descending speed of the drill bit, and the rotation speed and the descending speed of the tap are matched with each other.

[0032] Double drilling or double tapping, set the processing heads 13 as drills or taps respectively, and the electric control clutch 15 is in the engaged state. The speed ratio of the stepless transmission 16 is one to one to ensure that the rotational speeds of the two key shafts 7 are the same. The conveying and transposition assembly 2 conveys two workpieces to the bottoms of the two drills or taps respectively, and then processing is carried out. After processing, the conveying and transposition assembly 2 conveys the two workpieces by a certain distance and processes the two workpieces again.

[0033] Single drilling or single tapping, which has the same principle as double drilling or double tapping. The difference is that the synchronizing plate 24 is removed to make the two sliding seats 10 independent of each other. At the same time, the electric control clutch 15 is in the disengaged state and does not transmit power. This state is the same as the single-station processing in the prior art.

[0034] Based on the setting of two processing head assemblies 3, through the design and optimization of the structure, this device can realize the switching of multiple modes such as drilling + tapping, double drilling, double tapping, single drilling, and single tapping, which not only meets the basic processing functions but also improves the efficiency of drilling and tapping.

[0035] In addition, in the drilling + tapping mode, the two sliding seats 10 descend synchronously. There are strict requirements for the rotational speed and the descending speed of the tap, and the feed speed of the drill is related to the rotational speed. Otherwise, there will be risks such as slow feed speed and low efficiency or stuck drill due to fast feed speed. Based on this: This device is provided with a stepless transmission 16, which can perform stepless speed change processing, so that in the drilling + tapping mode, the descending speed and the rotational speeds of the two key shafts 7 can be proportionally controlled, thus ensuring efficiency and preventing the drill from getting stuck.

[0036] In addition, while this device is driven by a set of multi-mode drive mechanisms 4, the connection method between the key shaft 7 and the first transmission sleeve 9 is used, which can ensure axial sliding while ensuring transmission, so that the motor 18 as the power source always remains in a fixed state, preventing the wires of the motor 18 from being wound and broken. Embodiment

[0037] A double-head CNC drilling and tapping center, as Figure 7 shown. To solve the safety problem, the following improvements are made based on Embodiment 1: A second transmission cylinder 37 is fixed at the bottom of the main shaft 11. The tool holder 12 is movably connected to the inner wall of the second transmission cylinder 37 through a slide plate 34, and a transmission groove 35 is formed inside the second transmission cylinder 37. A transmission protrusion 36 matching the transmission groove 35 is arranged at the top of the slide plate 34.

[0038] The transmission groove 35 and the transmission protrusion 36 are any one of "linear", "cross-shaped", and "hexagonal".

[0039] In the use of this embodiment, when the processing head 13 at the bottom contacts the workpiece and is subjected to a reaction force, it will rise, so that the transmission groove 35 is combined with the transmission protrusion 36, and the main shaft 11 and the tool holder 12 are in transmission cooperation. Otherwise, the tool holder 12 moves downward under the action of gravity, and the transmission groove 35 is disengaged from the transmission protrusion 36.

[0040] Since during tapping, the size of the tap is fixed, its downward speed and rotational speed must be strictly matched, that is, the tap must descend by one pitch while rotating one circle, otherwise tapping will fail. Based on this: In this device, by arranging structures such as a transmission groove 35 and a transmission protrusion 36 between the main shaft 11 and the tool holder 12, the combination and separation of the transmission groove 35 and the transmission protrusion 36 are controlled by the reaction force and gravity. On the one hand, the cooperation between the transmission groove 35 and the transmission protrusion 36 has a certain longitudinal cooperation interval, and this interval can compensate to a certain extent for the errors in the control of the actual rotational speed and lifting speed, ensuring the reliability of tapping. On the other hand, when not drilling or tapping, there is only a transmission with a small frictional force between the transmission cylinder two 37 and the tool holder 12. At this time, even if the worker's clothes or gloves contact the processing head 13, the processing head 13 will stop immediately and will not be wound around it, thus increasing safety. Embodiment

[0041] A double-headed CNC drilling and tapping center, as Figure 5 、 6 shown, in order to solve the conveying problem; on the basis of Embodiment 1 or 2, the following improvements are made in this embodiment: The conveying and transposition assembly 2 includes a belt / chain transmission assembly 31 arranged inside the first frame 1 and a plurality of support plates 26 located outside the belt / chain transmission assembly 31 and connected to the outer wall of the belt / chain of the belt / chain transmission assembly 31 through a connecting belt 30. A belt / chain transmission assembly 31 parallel to the movement path of the belt / chain transmission assembly 31 is provided on the inner side wall of the first frame 1. At least two groups and at least two rollers 33 are fixed on the side wall of the support plate 26. The outer wall of the roller 33 is rotatably connected with a roller 32, and the roller 32 is in rolling cooperation with the inner wall of the belt / chain transmission assembly 31.

[0042] Four corners of the outer wall of the support plate 26 are all fixed with stud bolts 28. The outer wall of the stud bolt 28 is sleeved with the same disassembly plate 29. A clamping assembly 27 for fixing the workpiece is arranged on the outer wall of the disassembly plate 29. In this embodiment, the specific type of the clamping assembly 27 is not limited, which is determined according to the workpiece to be processed, and the fixture design is a mature technology, so it will not be elaborated in this embodiment.

[0043] In the use of this embodiment, the workpiece can be fixed through the clamping assembly 27. When the belt / chain transmission assembly 31 is started, it can drive the support plate 26 to move through the connecting belt 30, thereby driving the workpiece to move.

[0044] In addition, this device is also equipped with a host computer control box, which is built-in with a numerical control program matching the functions of this device. Since it is prior art and no creative work has been done on it, it will not be elaborated here.

[0045] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A double-head CNC drilling and tapping center, comprising a frame 1 (1) and a frame 2 (5) fixed to the frame 1 (1) and the ground, characterized in that: The inner side of the frame one (1) is provided with a conveying and transposing assembly (2) for fixing and conveying a workpiece, the front side of the frame two (5) is provided with two groups of processing head assemblies (3), and the front side of the frame two (5) is provided with a multi-mode driving mechanism (4) for driving the processing head assemblies (3); The processing head assembly (3) comprises a slide seat (10), a spindle seat (14) fixed to the side wall of the slide seat (10), and a spindle (11) rotatably connected to the inner wall of the spindle seat (14); a slide rail (6) is fixed to the side wall of the frame 2 (5); the slide seat (10) is slidably matched with the outer wall of the slide rail (6) through an electric slider (8); the bottom of the spindle (11) is connected to the processing head (13) through a tool handle (12); the top of the spindle (11) is connected to a key shaft (7) through a transmission sleeve 1 (9); and the two key shafts (7) are connected to the multi-mode drive mechanism (4) through transmission.

2. A double-head CNC drilling and tapping center according to claim 1, characterized in that: The multi-mode drive mechanism (4) comprises an electronically controlled clutch (15) fixed to the frame 2 (5), a continuously variable transmission (16) and a motor (18); the output shaft of the synchronization component (17) is connected to the end of one of the key shafts (7) via a coupling, and the output shaft of the motor (18) is connected to the input shaft of the continuously variable transmission (16) via the synchronization component (17); the output shaft of the continuously variable transmission (16) is fixedly connected to the input shaft of the electronically controlled clutch (15), and the output shaft of the electronically controlled clutch (15) is fixedly connected to the end of another key shaft (7).

3. A double-head CNC drilling and tapping center according to claim 2, characterized in that: The key shaft (7) is movably inserted into the inner wall of the transmission sleeve (9), the inner wall of the transmission sleeve (9) is provided with a key slot (20), and the outer wall of the key shaft (7) is fixed with a key protrusion (19) which is clearance-matched with the key slot (20).

4. A double-head CNC drilling and tapping center according to claim 3, characterized in that: The inner wall of the key protrusion (19) is provided with a limit groove (21), the inner walls of the two mutually matching limit grooves (21) are matched with a same synchronization plate (24), the inner wall of the limit groove (21) is provided with a screw hole (22), the inner wall of the synchronization plate (24) is provided with a through hole (23), and the inner wall of the screw hole (22) is connected to a connecting bolt (25) penetrating the through hole (23) via a thread.

5. A double-head CNC drilling and tapping center according to claim 1, characterized in that: A second transmission cylinder (37) is fixed at the bottom of the main shaft (11), the tool handle (12) is movably connected to the inner wall of the second transmission cylinder (37) via a slide plate (34), a transmission groove (35) is provided on the inner side of the second transmission cylinder (37), and a transmission protrusion (36) matching the transmission groove (35) is provided on the top of the slide plate (34).

6. A double-head CNC drilling and tapping center according to claim 5, characterized in that: The transmission groove (35) and the transmission protrusion (36) are any one of "straight-shaped", "cross-shaped" and "hexagonal" shapes.

7. A double-head CNC drilling and tapping center according to claim 1, characterized in that: The conveying transposition assembly (2) comprises a belt / chain transmission assembly (31) arranged on the inner side of the frame (1) and a plurality of support plates (26) located on the periphery of the belt / chain transmission assembly (31) and connected to the belt / chain outer wall of the belt / chain transmission assembly (31) via a connecting belt (30).

8. A double-head CNC drilling and tapping center according to claim 7, characterized in that: The inner side wall of the frame 1 (1) is provided with a belt / chain transmission assembly (31) parallel to the movement path of the belt / chain transmission assembly (31); at least two groups of rollers (33) with at least two rollers in each group are fixed to the side wall of the support plate (26); the outer wall of the roller (33) is rotatably connected to a roller (32); the roller (32) rolls in cooperation with the inner wall of the belt / chain transmission assembly (31).

9. A double-head CNC drilling and tapping center according to claim 8, characterized in that: A disassembly plate (29) is provided on one side of the support plate (26), and a clamping assembly (27) for fixing a workpiece is provided on an outer wall of the disassembly plate (29).

10. A double-head CNC drilling and tapping center according to claim 8, characterized in that: Studs (28) are fixed to the four corners of the outer wall of the support plate (26), the outer wall of the studs (28) is sleeved with a disassembly plate (29), and the outer wall of the disassembly plate (29) is provided with a clamping assembly (27) for fixing the workpiece.

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